Battery pack and assembly method

Abstract

The embodiment of the invention provides a battery pack and an assembling method, the battery pack comprises a frame assembly, bottom plates and a battery cell group, the frame assembly comprises a first longitudinal beam, a second longitudinal beam and a plurality of cross beams, the plurality of cross beams are arranged at intervals and connected between the first longitudinal beam and the second longitudinal beam, the bottom plates are arranged between the adjacent cross beams, the bottom plates are detachably connected with the cross beams, and the battery cell group is arranged between the first longitudinal beam and the second longitudinal beam. A battery cell group is arranged between at least part of adjacent cross beams, and the battery cell group is borne on the bottom plate. According to the battery pack disclosed by the embodiment of the invention, the bottom plate and the borne battery cell group can be independently disassembled and assembled, so that the whole disassembled battery cell group or a plurality of battery cells in the disassembled battery cell group can be independently replaced, and the battery pack disclosed by the embodiment of the invention is good in maintainability.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a battery pack and an assembling method thereof. Background Art

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

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

[0004] To this end, an embodiment of the present invention provides a battery pack.

[0005] An embodiment of the present invention further provides a battery pack assembly method.

[0006] The battery pack of the embodiment of the present invention comprises:

[0007] A frame assembly, a bottom plate and a battery cell group, wherein the frame assembly comprises a first longitudinal beam, a second longitudinal beam and a plurality of cross beams, wherein the plurality of cross beams are arranged at intervals and connected between the first longitudinal beam and the second longitudinal beam, wherein the bottom plate is arranged between adjacent cross beams, wherein the bottom plate is detachably connected to the cross beams, wherein the battery cell group is arranged between at least some of the adjacent cross beams, and wherein the battery cell group is carried on the bottom plate.

[0008] In the battery pack of the embodiment of the present invention, the bottom plate is arranged between adjacent cross beams and carries corresponding battery cell groups, and the bottom plate and the cross beams are detachably connected so that the bottom plate and the carried battery cell groups can be separately disassembled and assembled, thereby independently replacing the disassembled battery cell group as a whole or several battery cells in the disassembled battery cell group. Therefore, the battery pack of the embodiment of the present invention has good maintainability.

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

[0010] In some embodiments, the bottom of the beam has a beam clamp, the beam clamp extends toward another beam adjacent to the beam, the side wall of the bottom plate is provided with a first clamping groove, and the beam clamp fits in the first clamping groove.

[0011] In some embodiments, a sealant layer is provided between the beam clamping platform and the groove wall surface of the first clamping groove.

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

[0013] In some embodiments, the bottom of the first longitudinal beam and the bottom of the second longitudinal beam are both connected to the bottom plate by clamping.

[0014] In some embodiments, the bottom of the first longitudinal beam has a first longitudinal beam bracket, the first longitudinal beam bracket extends toward the second longitudinal beam, the bottom of the second longitudinal beam has a second longitudinal beam bracket, the second longitudinal beam bracket extends toward the first longitudinal beam, the end wall of the base plate is provided with a second slot, the first longitudinal beam bracket and the second longitudinal beam bracket fit in the corresponding second slot.

[0015] In some embodiments, a sealant layer is provided between the first longitudinal beam clamp and the corresponding groove wall surface of the second groove, and a sealant layer is provided between the second longitudinal beam clamp and the corresponding groove wall surface of the second groove.

[0016] In some embodiments, the crossbeam comprises a heat exchange crossbeam, a heat exchange channel for the flow of heat exchange medium is provided inside the heat exchange crossbeam, and the heat exchange crossbeam is located between adjacent battery cell groups.

[0017] In some embodiments, a bypass channel for the flow of heat exchange medium is provided inside the first longitudinal beam, a converging channel for the flow of heat exchange medium is provided inside the second longitudinal beam, and the heat exchange channel of the heat exchange cross beam is connected between the bypass channel and the converging channel.

[0018] In some embodiments, the frame assembly also includes a connecting bolt, a connecting channel is provided inside the connecting bolt, and the connecting bolt includes a first connecting bolt and a second connecting bolt, the first connecting bolt connects the first longitudinal beam and the heat exchange beam, 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 and the heat exchange beam, and the connecting channel of the second connecting bolt connects the confluence channel and the heat exchange channel.

[0019] In some embodiments, the beam includes a supporting beam, there are at least two supporting beams, a plurality of the heat exchange beams arranged at intervals are provided between at least some adjacent supporting beams, and the battery cell group is provided between the supporting beam and the adjacent heat exchange beams.

[0020] In some embodiments, the battery pack further includes a top pressing assembly, which is connected to the top of the frame assembly and abuts against the top of the battery cell group.

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

[0022] In some embodiments, the battery cell group includes at least two battery cells arranged at intervals, and a plurality of the pressure strips are provided on the top of the battery cell group. The plurality of the pressure strips are arranged at intervals along the battery cell arrangement direction of the battery cell group, and a boss extending along the spaced arrangement direction of the pressure strips is provided on the top of the pressure strips. Along the arrangement direction of the plurality of pressure strips, the bottom of the pressure strip located at the outermost end is arranged outside the battery cell at the outermost end, and the boss of the pressure strip located at the outermost end abuts against the top of the battery cell at the outermost end, and the bottoms of the remaining pressure strips are inserted between adjacent battery cells, and the bosses of the remaining pressure strips abut against the tops of adjacent battery cells.

[0023] In some embodiments, the pressing assembly includes a cover plate, which is connected to the first longitudinal beam, the second longitudinal beam, and the outermost supporting beam along the direction in which the plurality of beams are spaced apart.

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

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

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

[0027] The plastic plate is arranged between the supporting crossbeam and the battery cell group.

[0028] The battery pack assembly method of the embodiment of the present invention includes:

[0029] S1, taking at least one crossbeam as a reference, and alternately connecting the bottom plate and the battery cell group to the crossbeam in sequence, thereby forming 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, thereby forming 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 arranged at intervals with the outermost crossbeam in the first assembly part along the arrangement direction, 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 the embodiment of the present invention is to use a crossbeam as a reference to alternately connect the bottom plate and the supported battery cell group to the crossbeam in sequence to form a first assembly part, connect at least one crossbeam other than the crossbeam of the first assembly part between the first longitudinal beam and the second longitudinal beam to form a second assembly part, and then move the first assembly part into the second assembly part and connect them, so that 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 to avoid the problem of the first assembly part being directly assembled in the second assembly part to cause interference with the second assembly part, thereby reducing the difficulty of assembling the battery pack.

[0032] At the same time, in the battery pack obtained by the battery pack assembly method of the embodiment of the present invention, the bottom plate is arranged between the bottoms of adjacent cross beams and carries the corresponding battery cell group, and the bottom plate is detachably connected to the bottom of the cross beam so that the bottom plate and the carried battery cell group can be disassembled and assembled separately, so that the disassembled battery cell group as a whole or several battery cells in the disassembled battery cell group can be replaced independently. Therefore, the battery pack obtained by the battery pack assembly method of the embodiment of the present invention has good maintainability.

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

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

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

[0036] In some embodiments, in step S1, the crossbeam used as a reference is connected between the first positioning beam and the second positioning beam, and then the bottom plate and the battery cell group supported thereon are alternately connected to the crossbeam in sequence, wherein each crossbeam connected in sequence is connected between the first positioning beam and the second positioning beam to define the position of each bottom plate, the battery cell group and each crossbeam connected in sequence relative to the crossbeam used as a reference;

[0037] In step S2, the first assembly part is clamped along the arrangement direction of the first assembly part by a clamping member, and then the first positioning beam and the second positioning beam are removed, and then the first assembly part clamped by the clamping member is moved into the second assembly part, and then the cross beam 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 part is connected above the second assembly part, and the horizontal position of the crossbeam serving as a reference relative to the second assembly part is constant;

[0039] In step S2, the first assembly part that has been connected is lowered relative to the second assembly part and falls into the second assembly part.

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

[0041] S3. Setting a top pressing component, wherein the top pressing component is connected to the top of at least two of the beams and abuts against the top of the battery cell group.

[0042] In some embodiments, the battery cell group includes at least two battery cells arranged at intervals, and the top pressing assembly includes a plurality of pressure strips, and a boss is provided on the top of the pressure strips;

[0043] In step S3, a plurality of the pressure strips are arranged at intervals along the arrangement direction of the battery cells, and the battery cells are abutted between the bottoms of two adjacent pressure strips, and the tops of the battery cells are abutted against the bosses, and then the pressure strips are connected to the tops of at least two of the beams.

[0044] In some embodiments, in step S1, in the process of alternately connecting the bottom plate and the battery cell group to the crossbeam, a stopper is provided between adjacent battery cells of the battery cell group;

[0045] In step S3, the limiting member is first taken out, and then a plurality of the pressing strips are arranged at intervals along the arrangement direction of the battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 is a schematic diagram of a battery pack of an embodiment of the present invention with the cover plate removed;

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

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

[0049] Figure 4 is a front view of a battery cell group, a heat exchange beam and a bottom plate of a battery pack according to an embodiment of the present invention;

[0050] Figure 5 is a partial enlarged schematic diagram of a battery pack after removing the cover plate according to an embodiment of the present invention;

[0051] Figure 6 is a partially enlarged schematic diagram of an explosion schematic diagram of a battery pack after removing a cover plate according to an embodiment of the present invention;

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

[0053] Figure 8 The process diagram of the battery pack assembly method according to the embodiment of the present invention is as follows Figure 1 ;

[0054] Fig. 9 The process diagram of the battery pack assembly method according to the embodiment of the present invention is as follows Figure 2 ;

[0055] Fig.10 FIG. 1 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] Fig.11 FIG. 1 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] Fig.12 The process diagram of the battery pack assembly method according to the embodiment of the present invention is as follows Figure 3 ;

[0058] Fig.13 The process diagram of the battery pack assembly method according to the embodiment of the present invention is as follows Figure 4 ;

[0059] Fig.14 The process diagram of the battery pack assembly method according to the embodiment of the present invention is as follows Figure 5 ;

[0060] Fig.15The process diagram of the battery pack assembly method according to the embodiment of the present invention is as follows Figure 6 .

[0061] Reference numerals:

[0062] 1. Frame assembly; 11. First longitudinal beam; 111. First longitudinal beam clamp; 12. Second longitudinal beam; 13. Cross beam; 131. Cross beam clamp; 132. Heat exchange cross beam; 133. Support cross beam; 14. Connecting bolt; 15. Fixing bolt; 2. Bottom plate; 21. First clamping slot; 3. Cell group; 31. Cell; 4. Sealant layer; 5. Top pressure assembly; 51. Pressure strip; 511. Boss; 52. Cover plate; 6. Foam layer; 7. Insulating sheet; 8. Plastic plate; 9. Sealing strip; 10. First assembly part; 20. Second assembly part; 30. First positioning beam; 40. Second positioning beam; 50. Clamp. DETAILED DESCRIPTION

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

[0064] Reference below Figure 1-Figure 15 A battery pack and an assembly method according to an embodiment of the present invention are described.

[0065] like Figure 1-Figure 7 As shown, the battery pack according to the embodiment of the present invention includes a frame assembly 1 , a bottom plate 2 and a battery cell group 3 .

[0066] The frame assembly 1 includes a first longitudinal beam 11, a second longitudinal beam 12 and a plurality of cross beams 13, wherein the plurality of cross beams 13 are arranged at intervals and connected between the first longitudinal beam 11 and the second longitudinal beam 12. Figure 1-Figure 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 cross beam 13 extends in the front-back direction and is connected between the first longitudinal beam 11 and the second longitudinal beam 12. There are multiple cross beams 13 arranged at intervals in the left-right direction.

[0067] A bottom plate 2 is provided between adjacent cross beams 13, and the bottom plate 2 is detachably connected to the cross beams 13. Figure 2-Figure 6 As shown, a corresponding bottom plate 2 is provided between the bottoms of each adjacent cross beam 13, so the bottom plates 2 are arranged in a plurality of intervals, and the bottom plates 2 are preferably strip plates extending in the front-to-back direction, and the bottom plates 2 are detachably connected to the bottoms of the cross beams 13. It can be understood that the bottom plates 2 are not limited to being connected between the bottoms of adjacent cross beams 13, and can also be higher than the bottoms of the cross beams 13.

[0068] At least some of the adjacent beams 13 are provided with a battery cell group 3, and the battery cell group 3 is supported on the bottom plate 2. Figure 2and Figure 3 As shown, except for the leftmost and rightmost adjacent beams 13, battery cell groups 3 are arranged between the other adjacent beams 13, and the battery cell groups 3 are carried on the corresponding bottom plates 2. In other words, except for the leftmost and rightmost bottom plates 2, the other bottom plates 2 all carry corresponding battery cell groups 3. It can be understood that in other embodiments, corresponding battery cell groups 3 can be arranged between all adjacent beams 13.

[0069] It should be noted that the battery cell group 3 refers to at least two battery cells 31 arranged between adjacent beams 13, preferably but not limited to a plurality of battery cells 31, and the plurality of battery cells 31 can be arranged in a row, or in two or more rows arranged in sequence along the left-right direction.

[0070] The battery cell groups 3 on the bottom plate 2 can be arranged in the same number of rows or in different numbers of rows, for example, part of the bottom plate 2 is provided with one row of battery cells 31, and another part of the bottom plate 2 is provided with two rows of battery cells 31. Thus, the number of battery cells 31 on the bottom plate 2 can be the same or different.

[0071] In the battery pack of the embodiment of the present invention, the bottom plate is arranged between adjacent cross beams and carries corresponding battery cell groups, and the bottom plate and the cross beams are detachably connected so that the bottom plate and the carried battery cell groups can be separately disassembled and assembled, thereby independently replacing the disassembled battery cell group as a whole or several battery cells in the disassembled battery cell group. Therefore, the battery pack of the embodiment of the present invention has good maintainability.

[0072] In some embodiments, the bottom plate 2 is connected to the bottom of the cross beam 13 by snapping, so as to facilitate the disassembly of the bottom plate 2 and the cross beam 13 , thereby facilitating the separate disassembly and assembly of the bottom plate 2 and the carried battery cell group 3 .

[0073] It can be understood that the base plate 2 and the bottom of the cross beam 13 are not limited to being connected by snap-fitting. In other embodiments, the base plate 2 and the bottom of the cross beam 13 are detachably bonded and connected by a sealant, or are detachably fastened by a snap, or are detachably connected by connecting parts such as bolts.

[0074] In some embodiments, the bottom of the beam 13 has a beam clamp 131 , which extends toward another beam 13 adjacent to the beam 13 , and the side wall of the bottom plate 2 is provided with a first clamping groove 21 , in which the beam clamp 131 fits.

[0075] like Figure 3-Figure 5As shown, the bottom of the beam 13 has a beam stop 131 extending in the left-right direction. Among the multiple beams 13 arranged at intervals in the left-right direction, the bottom of the beam 13 located on the far left has a beam stop 131 extending to the right, and the bottom of the beam 13 located on the far right has a beam stop 131 extending to the left. The left and right sides of the bottoms of the remaining beams 13 are provided with beam stoppers 131. In other words, the bottoms of the remaining beams 13 have beam stoppers 131 extending to the right and beam stoppers 131 extending to the left.

[0076] The left and right walls of the base plate 2 are both provided with a first card slot 21, and the first card slot 21 is also formed on the bottom surface of the base plate 2. When the base plate 2 is connected between adjacent beams 13, the beam clamp 131 extending to the right of the beam 13 on the left side of the base plate 2 is engaged in the first card slot 21 of the left side wall of the base plate 2, and the beam clamp 131 extending to the left of the beam 13 on the right side of the base plate 2 is engaged in the first card slot 21 of the right side wall of the base plate 2, thereby supporting the base plate 2 and allowing the base plate 2 to move upward relative to the adjacent beams 13 for disassembly.

[0077] It can be understood that the cross beam 13 and the base plate 2 are not limited to being connected by being clamped together through the cross beam clamping platform 131 and the first clamping groove 21. In other embodiments, the side of the cross beam 13 is flush with and abuts against the side of the base plate 2, the base plate 2 abuts between the side surfaces of adjacent cross beams 13, and the base plate 2 is clamped between the adjacent cross beams 13 through the spacing between adjacent cross beams 13. Furthermore, among the adjacent cross beams 13, the right side surface of the bottom of the left cross beam 13 and the left side surface of the bottom of the right cross beam 13 extend from top to bottom and are relatively close to each other and are inclinedly arranged. The left side surface and the right side surface of the base plate 2 also extend from top to bottom and are relatively close to each other and are inclinedly arranged, so that the base plate 2 is clamped between the right side surface of the bottom of the left cross beam 13 and the left side surface of the bottom of the right cross beam 13, and can prevent the base plate 2 from falling off the adjacent cross beams 13.

[0078] In some embodiments, a sealant layer 4 is disposed between the beam clamping platform 131 and the wall surface of the first clamping slot 21 .

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

[0080] The sealant layer 4 assists in fixing the beam clamp 131 and the bottom plate 2 , and fills the gap caused by the processing error between the beam clamp 131 and the first clamping groove 21 , thereby playing a sealing role. Meanwhile, the bonding strength of the sealant layer 4 will not hinder the removal of the bottom plate 2 .

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

[0082] like Figure 2-Figure 6 As shown, the bottom 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. Avoid gaps between the bottom plate 2 and the first longitudinal beam 11 and the second longitudinal beam 12, which may cause foreign matter to enter and damage the battery cell group 3, while ensuring that the bottom 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 connected to the bottom plate 2 by snapping, so as to facilitate the disassembly of the bottom plate 2 and the first longitudinal beam 11 and the second longitudinal beam 12, thereby facilitating the separate disassembly and assembly of the bottom plate 2 and the battery cell group 3 carried thereon.

[0084] It can be understood that the base plate 2 and the bottom of the first longitudinal beam 11 and the bottom of the second longitudinal beam 12 are not limited to being connected by snap-fitting. In other embodiments, the base plate 2 and the bottom of the first longitudinal beam 11 and the bottom of the second longitudinal beam 12 are detachably bonded and connected by sealant, or are detachably fastened by snaps, or are detachably connected by connecting parts such as bolts.

[0085] In some embodiments, the bottom of the first longitudinal beam 11 has a first longitudinal beam bracket 111, the first longitudinal beam bracket 111 extends toward the second longitudinal beam 12, the bottom of the second longitudinal beam 12 has a second longitudinal beam bracket (not shown in the figure), the second longitudinal beam bracket extends toward the first longitudinal beam 11, the end wall of the base plate 2 is provided with a second groove (not shown in the figure), and the first longitudinal beam bracket 111 and the second longitudinal beam bracket are matched in the corresponding second groove.

[0086] like Figure 3 As shown, the bottom of the first longitudinal beam 11 has a first longitudinal beam bracket 111 extending backward, the bottom of the second longitudinal beam 12 has a second longitudinal beam bracket extending forward, and the front end wall and the rear end wall of the bottom plate 2 are both provided with a second bracket groove. When the bottom plate 2 is connected between the first longitudinal beam 11 and the second longitudinal beam 12, the first longitudinal beam bracket 111 fits in the second bracket groove of the front end wall of the bottom plate 2, and the second longitudinal beam bracket fits in the second bracket groove of the rear end wall of the bottom plate 2, thereby supporting the bottom plate 2 and allowing the bottom plate 2 to be moved upward relative to the first longitudinal beam 11 and the second longitudinal beam 12 for disassembly.

[0087] It can be understood that the first longitudinal beam 11 and the second longitudinal beam 12 are not limited to being connected by the first longitudinal beam clamp 111 and the second longitudinal beam clamp and the second clamping groove of the base plate 2. In other embodiments, the cross beam 13 abuts between the first longitudinal beam 11 and the second longitudinal beam 12, and the base plate 2 can be further clamped between the first longitudinal beam 11 and the second longitudinal beam 12 through 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 fixture 111 and the corresponding groove wall of the second groove, and a sealant layer 4 is provided between the second longitudinal beam fixture and the corresponding groove wall of the second groove. In other words, the first longitudinal beam fixture 111 is bonded to the groove wall of the second groove with a sealant, and the second longitudinal beam fixture is bonded to the groove wall of the second groove with a sealant. Preferably, a sealant layer 4 is provided between the vertical wall of the first longitudinal beam fixture 111 and the vertical groove wall of the second groove, and a sealant layer 4 is provided between the vertical wall of the second longitudinal beam fixture and the vertical groove wall of the second groove.

[0089] The sealant layer 4 assists in fixing the first longitudinal beam 11 and the bottom plate 2, and the second longitudinal beam 12 and the bottom plate 2, and fills the gap caused by the processing errors of the first longitudinal beam 11, the second longitudinal beam 12 and the bottom plate 2, thereby playing a sealing role. At the same time, the bonding strength of the sealant layer 4 will not hinder the removal of the bottom plate 2.

[0090] It can be understood that the bottom plate 2 is not limited to being simultaneously connected to the first longitudinal beam 11, the second longitudinal beam 12 and the cross beam 13 by being clipped together. In other embodiments, the bottom plate 2 is clipped together with the cross beam 13 and is bonded together with the first longitudinal beam 11 and the second longitudinal beam 12; or, the bottom plate 2 is bonded together with the cross beam 13 and is clipped together with the first longitudinal beam 11 and the second longitudinal beam 12.

[0091] In some embodiments, the beam 13 includes a heat exchange beam 132 . A heat exchange channel for the flow of heat exchange medium is provided inside the heat exchange beam 132 . The heat exchange beam 132 is located between adjacent battery cell groups 3 .

[0092] like Figure 2-Figure 6 As shown, the beam 13 includes a heat exchange beam 132, and the heat exchange beam 132 is preferably but not limited to a plurality of heat exchange beams. The heat exchange beam 132 is provided with a heat exchange channel for the flow of a heat exchange medium. The heat exchange medium is preferably but not limited to a liquid medium. The heat exchange beam 132 is located between adjacent battery cell groups 3 to perform heat exchange and cooling of the battery cell group 3, and at the same time plays a role in fixing the battery cell group 3.

[0093] In some embodiments, a bypass channel for the flow of heat exchange medium is provided inside the first longitudinal beam 11, a converging channel for the flow of heat exchange medium is provided inside the second longitudinal beam 12, and the heat exchange channel of the heat exchange cross beam 132 is connected between the bypass channel and the converging channel.

[0094] like Figure 2 and Figure 3As shown, a shunt channel for the flow of heat exchange medium is provided inside the first longitudinal beam 11, and the shunt channel extends in the left-right direction and passes through all the heat exchange cross beams 132. A converging channel for the flow of heat exchange medium is provided inside the second longitudinal beam 12, and the converging channel extends in the left-right direction and passes through all the heat exchange cross beams 132. The heat exchange cross beam 132 is connected between the first longitudinal beam 11 and the second longitudinal beam 12, and the front end of the heat exchange channel in the heat exchange cross beam 132 is connected to the shunt channel, and the rear end of the heat exchange channel is connected to the converging channel.

[0095] The heat exchange medium is diverted from the diverting channel of the first longitudinal beam 11 to the heat exchange channels of the plurality of heat exchange cross beams 132, and the heat exchange medium exchanges heat with the battery cell group 3 in the heat exchange channel, and then enters the converging channel of the second longitudinal beam 12 to be converging and discharged. Therefore, the flow channel structure through which the heat exchange medium passes is simple and easy to process.

[0096] Preferably, the first longitudinal beam 11 is provided with a heat exchange medium inlet connected to the diversion channel, and the second longitudinal beam 12 is provided with a heat exchange medium outlet connected to the converging flow channel. It is understandable that in other embodiments, the heat exchange medium inlet and the heat exchange medium outlet may also be provided on the cross beam 13, preferably on other cross beams 13 except the heat exchange cross beam 132.

[0097] In some embodiments, the frame assembly 1 also includes a connecting bolt 14, a connecting channel is provided inside the connecting bolt 14, and 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 beam 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 beam 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 is connected between the front end of the first longitudinal beam 11 and the heat exchange beam 132, and between the rear end of the second longitudinal beam 12 and the heat exchange beam 132, wherein the connecting bolt 14 connecting the first longitudinal beam 11 and the heat exchange beam 132 is called a first connecting bolt, and the connecting bolt 14 connecting the second longitudinal beam 12 and the heat exchange beam 132 is called a second connecting bolt.

[0099] A connecting channel is provided inside the connecting bolt 14. In other words, the connecting bolt 14 is a hollow bolt. The first connecting bolt of the first connecting bolt connects the shunt channel and the heat exchange channel, and the second connecting bolt connects the converging channel and the heat exchange channel, so that the heat exchange medium can enter the heat exchange channel from the shunt channel and enter the converging channel from the heat exchange channel.

[0100] The connecting bolts 14 connect and fix the first longitudinal beam 11 and the heat exchange beam 132, and connect and fix the second longitudinal beam 12 and the heat exchange beam 132. They also connect the diversion channel and the heat exchange channel, and connect the converging channel and the heat exchange channel, and have high sealing performance.

[0101] In some embodiments, Figure 2 and Figure 3 As shown, the frame assembly 1 further includes fixing bolts 15, and the fixing bolts 15 include a first fixing bolt and a second fixing bolt, the first fixing bolt is connected between the first longitudinal beam 11 and the front end of the heat exchange beam 132, and the second fixing bolt is connected between the second longitudinal beam 12 and the rear end of the heat exchange beam 132. The fixing bolts 15 are used to connect and fix the first longitudinal beam 11 and the heat exchange beam 132, and to connect and fix the second longitudinal beam 12 and the heat exchange beam 132, so as to ensure the structural strength of the frame assembly 1.

[0102] Preferably, the front end and the rear end of the heat exchange beam 132 are respectively connected to a connecting bolt 14 and two fixing bolts 15 , and 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 beam 13 includes a supporting beam 133 , there are at least two supporting beams 133 , a plurality of heat exchange beams 132 arranged at intervals are provided between at least some adjacent supporting beams 133 , and a battery cell group 3 is provided between the supporting beam 133 and adjacent heat exchange beams 132 .

[0104] like Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the cross beam 13 also includes a supporting cross beam 133, and there are at least two supporting cross beams 133, such as two, three, more than three, preferably five. A plurality of heat exchange cross beams 132 may be arranged between all adjacent supporting cross beams 133, or a plurality of heat exchange cross beams 132 may be arranged between some adjacent supporting cross beams 133. Preferably, from left to right, a plurality of heat exchange cross beams 132 are arranged between the second supporting cross beam 133 and the third supporting cross beam 133, and a plurality of heat exchange cross beams 132 are arranged between the third supporting cross beam 133 and the fourth supporting cross beam 133, so as to facilitate the assembly of the battery pack, and a battery cell group 3 is arranged between the adjacent supporting cross beams 133 and the heat exchange cross beams 132.

[0105] The supporting cross beam 133 mainly plays a supporting role to ensure the structural strength of the frame assembly 1 , and the supporting cross beam 133 also cooperates with the heat exchange cross beam 132 to fix the battery cell group 3 .

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

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

[0108] like Figure 2 As shown, a top pressing assembly 5 is provided on the top of the frame assembly 1, and the top pressing assembly 5 abuts against the top of the battery cell group 3, thereby cooperating with the bottom plate 2 to fix the battery cell group 3. Therefore, the left and right directions of the battery cell group 3 are defined by the adjacent cross beams 13, the front and rear directions of the battery cell group 3 are defined by the first longitudinal beam 11 and the second longitudinal beam 12, and the up and down directions of the battery cell group 3 are defined by the corresponding bottom plate 2 and the top pressing assembly 5, thereby fixing the battery cell group 3 in the battery pack, ensuring that the battery cell group 3 is stably installed and has high safety.

[0109] In some embodiments, the top pressing assembly 5 includes a pressing strip 51 , which is detachably connected to at least a portion of the supporting beam 133 and abuts against the top of the battery cell group 3 .

[0110] like Figure 1-Figure 3 , Figure 5-Figure 7 As shown, the top pressing assembly 5 includes a pressure strip 51, which extends in the left-right direction. The pressure strip 51 can be detachably connected to the top of all the supporting beams 133, or to the top of part of the supporting beams 133. Preferably, the pressure strip 51 is detachably connected to the top of the adjacent supporting beams 133 with the battery cell group 3 in the middle. In other words, from left to right, the pressure strip 51 is detachably connected between the top of the second supporting beam 133 and the top of the third supporting beam 133, and the pressure strip 51 is detachably connected between the top of the third supporting beam 133 and the top of the fourth supporting beam 133. The pressure strip 51 is preferably detachably connected to the supporting beam 133 by bolts.

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

[0112] The holding strip 51 cooperates with the bottom plate 2 to limit the vertical position of the battery pack 3, so the battery pack has a low structural complexity and is light in weight. At the same time, the holding strip 51 is detachably connected to the support beam 133 to facilitate the disassembly of the battery pack 3 and the bottom plate 2.

[0113] In some embodiments, the battery cell group 3 includes at least two battery cells 31 arranged at intervals, and a plurality of pressure strips 51 are provided on the top of the battery cell group 3. The plurality of pressure strips 51 are arranged at intervals along the arrangement direction of the battery cells 31 of the battery cell group 3, and a boss 511 extending along the spaced arrangement direction of the pressure strips 51 is provided on the top of the pressure strips 51. Along the arrangement direction of the plurality of pressure strips 51, the bottom of the pressure strip 51 located at the outermost end is arranged outside the outermost battery cell 31, and the boss 511 of the pressure strip 51 located at the outermost end abuts against the top of the outermost battery cell 31, and 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 tops of adjacent battery cells 31.

[0114] like Figure 1 and Figure 7 As shown, the battery cell group 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, bosses 511 are provided at both the front and rear ends of the top of the pressure strip 51. In other words, the cross section of the pressure strip 51 is "T"-shaped.

[0116] There are multiple beadings 51 arranged at intervals along the front-to-back direction. The frontmost beading 51 is located at the front end of the frontmost battery cell 31, and the bottom of the frontmost beading 51 abuts the front end surface of the frontmost battery cell 31, and the boss 511 of the frontmost beading 51 abuts the top surface of the frontmost battery cell 31. The last beading 51 is located at the rear end of the last battery cell 31, and the bottom of the last beading 51 abuts the rear end surface of the last battery cell 31, and the boss 511 of the last beading 51 abuts the top surface of the last battery cell 31. Adjacent battery cells 31 among the multiple battery cells 31 are also provided with corresponding beadings 51, and the bottom of the beading 51 is inserted between the beadings 51, and the two bosses 511 on the top of the beading 51 abut on the top of the adjacent battery cells 31 in a one-to-one correspondence.

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

[0118] Further, multiple cell groups 3 are arranged side by side between two adjacent support beams 133, and the cells 31 of the multiple cell groups 3 are arranged correspondingly in the left and right directions, so that the gaps between adjacent cells 31 in the multiple cell groups 3 are connected. The frontmost pressure strip 51 is simultaneously located at the front end of the multiple cell groups 3, and the rearmost pressure strip 51 is simultaneously located at the rear front end of the multiple cell groups 3, and the remaining pressure strips 51 pass through the connected gaps of the multiple cell groups 3, so as to simultaneously define the cells in the multiple cell groups 3.

[0119] In some embodiments, the pressing assembly 5 includes a cover plate 52 , which is connected to the first longitudinal beam 11 , the second longitudinal beam 12 , and the outermost supporting cross beam 133 along the direction in which the multiple cross beams 13 are arranged in an interval manner.

[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 supporting beam 133 and the rightmost supporting beam 133, preferably but not limited to being detachably connected by bolts to seal and protect above the battery cell group 3.

[0121] Preferably, the top surfaces of the first longitudinal beam 11 , the second longitudinal beam 12 , the leftmost supporting beam 133 and the rightmost supporting 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 understandable that the cover plate 52 and the pressure strip 51 are not limited to be provided at the same time. In other embodiments, the cover plate 52 abuts against the top of the battery cell group 3 .

[0123] In some embodiments, the battery pack of the embodiment 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 supporting beam 133 and the battery cell group 3 , and / or between the heat exchange beam 132 and the battery cell group 3 .

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

[0126] The foam layer 6 plays a role of buffering and supporting the battery cell group 3 to prevent the battery cells 31 of the battery cell group 3 from shaking and colliding, and also plays a role of flame retardancy.

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

[0128] like Figure 6 As shown, an insulating sheet 7 is provided between the cell group 3 and the bottom plate 2. An insulating sheet 7 is provided between the cell group 3 and the heat exchange beam 132, and an insulating sheet 7 and a foam layer 6 are provided between the cell group 3 and the heat exchange beam 132 between the adjacent support beam 133 and the heat exchange beam 132 where the cell group 3 is provided, and between the cell group 3 and the heat exchange beam 132, and the foam layer 6 is located between the insulating sheet 7 and the cell group 3. An insulating sheet 7 is provided between the cell group 3 and the pressure strip 51.

[0129] The insulating sheet 7 plays an insulating role.

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

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

[0132] The plastic plate 8 plays a role in protecting and insulating the battery cell group 3 .

[0133] It is understandable that, in other embodiments, an insulating sheet and a foam layer may be provided between the supporting beam and the battery cell group.

[0134] Reference below Figure 1-Figure 15 A battery pack assembling method according to an embodiment of the present invention is described.

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

[0136] like Figure 8-Figure 15 As shown, the battery pack assembly method of the embodiment of the present invention includes step S1 and step S2.

[0137] Step S1 includes taking at least one cross beam 13 as a reference, and alternately connecting the bottom plate 2 and the supported battery cell group 3 with the cross beam 13 in sequence, thereby connecting to form a first assembly part 10; at least one cross beam 13 other than the cross beam 13 of the first assembly part 10 is connected between the first longitudinal beam 11 and the second longitudinal beam 12, thereby connecting to form a second assembly part 20.

[0138] For example, Figure 8-Figure 13 As shown, the first assembling part 10 and the second assembling part 20 of the battery pack are assembled separately.

[0139] The first assembly part 10 uses at least one crossbeam 13 of the battery pack as a reference, and alternately connects the bottom plate 2 and the battery cell group 3 to the crossbeam 13 in sequence. Preferably, there are two crossbeams 13 as a reference, and the bottom plate 2 and the battery cell group 3 are alternately connected to the crossbeams 13 at the two crossbeams 13 as a reference. Specifically, the bottom plate 2 is first connected to the bottom of the previous crossbeam 13 (such as Fig.10 Then place the battery pack 3 on the bottom plate 2 (as shown in Fig.11As shown in FIG. 1 , the next crossbeam 13 is connected to the side of the bottom plate 2 and the battery cell group 3 away from the previous crossbeam 13, and the bottom plate 2, the battery cell group 3 and the crossbeam 13 are repeatedly placed. The end of the placement may be the bottom plate 2 and the battery cell group 3 carried, or the crossbeam 13. It can be understood that in other embodiments, there may be only one crossbeam 13 used as a reference.

[0140] The second assembly part 20 is formed by connecting at least one other crossbeam 13 of the battery pack and the first longitudinal beam 11 and the second longitudinal beam 12. Preferably, one crossbeam 13 other than the first assembly part 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 part 10 is connected between the right ends of the first longitudinal beam 11 and the second longitudinal beam 12, and another crossbeam 13 other than the first assembly part 10 is connected between the middle of the first longitudinal beam 11 and the middle of the second longitudinal beam 12. It can be understood that in other embodiments, the crossbeam 13 of the second assembly part 20 can be only two connected at the left end and the right end, and the crossbeam 13 of the second assembly part 20 can also be set to only one.

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

[0142] Step S2 includes moving the first assembly part 10 into the second assembly part 20, the cross beam 13 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 cross beam 13 in the second assembly part 20 is arranged at intervals with the outermost cross beam 13 in the first assembly part 10 along the arrangement direction, the bottom plate 2 is connected between the cross beam 13 in the second assembly part 20 and the outermost cross beam 13 in the first assembly part 10, and the cross beam 13 in the first assembly part 10 is connected between the first longitudinal beam 11 and the second longitudinal beam 12.

[0143] For example, Figure 13-Figure 15 As shown, the assembled first assembly part 10 is moved into the assembled second assembly part 20 .

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

[0145] If the end of the first assembly part 10 along the alternating connection direction is the bottom plate 2 and the carried battery cell group 3, after the first assembly part 10 moves into the second assembly part 20, the bottom plate 2 at the end is connected to the crossbeam 13 of the second assembly part 20. If the end of the first assembly part 10 along the alternating connection direction is the crossbeam 13, after the first assembly part 10 moves into the second assembly part 20, the crossbeam 13 at the end is arranged alternately with the crossbeam 13 of the second assembly part 20, and the bottom plate 2 is connected between the two crossbeams 13. Preferably, in the first assembly part 10, the ends arranged by the two crossbeams 13 as references are both the bottom plate 2 and the carried battery cell group 3, and the bottom plates 2 and the carried battery cell group 3 at the two ends are arranged oppositely in the left-right direction, and after the first assembly part 10 moves into the second assembly part 20, the crossbeam 13 located in the middle of the second assembly part 20 is connected between the bottom plates 2 at the two ends.

[0146] All cross beams 13 in the first assembly part 10 are then connected between the first longitudinal beams 11 and the second longitudinal beams 12 , preferably by bolting.

[0147] The battery pack assembly method of the embodiment of the present invention is to use a crossbeam as a reference to alternately connect the bottom plate and the supported battery cell group to the crossbeam in sequence to form a first assembly part, connect at least one crossbeam other than the crossbeam of the first assembly part between the first longitudinal beam and the second longitudinal beam to form a second assembly part, and then move the first assembly part into the second assembly part and connect them, so that 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 to avoid the problem of the first assembly part being directly assembled in the second assembly part to cause interference with the second assembly part, thereby reducing the difficulty of assembling the battery pack.

[0148] At the same time, in the battery pack obtained by the battery pack assembly method of the embodiment of the present invention, the bottom plate is arranged between the bottoms of adjacent cross beams and carries the corresponding battery cell group, and the bottom plate is detachably connected to the bottom of the cross beam so that the bottom plate and the carried battery cell group can be disassembled and assembled separately, so that the disassembled battery cell group as a whole or several battery cells in the disassembled battery cell group can be replaced independently. Therefore, the battery pack obtained by the battery pack assembly method of the embodiment of the present invention has good maintainability.

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

[0150] In some embodiments, the bottom plate 2 is connected to the bottom of the cross beam 13 by snapping. During the process of assembling the first assembly part 10, the bottom plate 2 is placed on the side of the previous cross beam 13 and is detachably snapped in connection. After the first assembly part 10 is moved into the second assembly part 20, when the cross beams 13 of the first assembly part 10 and the cross beams 13 of the second assembly part 20 are arranged at intervals, the bottom plate 2 is dropped and placed between the two cross beams 13 and the bottom plate 2 is detachably snapped in between the two cross beams. Thus, the battery pack assembly method is simple, and it is convenient to disassemble the bottom plate 2 and the carried battery cell group 3.

[0151] It is understandable that when a sealant layer 4 is required between the bottom plate 2 and the bottom of the cross beam 13, during the assembly process of the first assembly part 10 or before the assembly process of the first assembly part 10, in other words, in step S1 or before step S1, it is necessary to apply sealant to the unassembled cross beam 13 and / or bottom plate 2. After the first assembly part 10 is moved into the second assembly part 20, and when the bottom plate 2 needs to be placed between adjacent cross beams 13, it is necessary to apply sealant to the corresponding cross beam 13 and / or bottom plate 2 before the first assembly part 10 and the second assembly part 20 are assembled or between the placement of the bottom plate 2, in other words, before step S1 or between the placement of the bottom 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 connected by clamping with the bottom plate 2. When the first assembly part 10 moves into the second assembly part 20, the bottom plate 2 falls between the bottom of the first longitudinal beam 11 and the bottom of the second longitudinal beam 12 and is detachably clamped between the bottom of the first longitudinal beam 11 and the bottom of the second longitudinal beam 12. Thus, the battery pack assembly method is simple, and it is convenient to disassemble the bottom plate 2 and the carried battery cell group 3.

[0153] It is understandable that when a sealant layer 4 needs to be provided between the bottom plate 2 and the bottom of the first longitudinal beam 11, as well as the bottom of the second longitudinal beam 12, it is necessary to apply sealant to the bottom of the bottom plate 2 and / or the first longitudinal beam 11, as well as the bottom of the second longitudinal beam 12 before assembling the first assembly part 10 and the second assembly part 20 or moving the first assembly part 10 into the second assembly part 20. In other words, before step S1, or between step S1 and step S2.

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

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

[0156] like Figure 8 As shown, in the first assembly part 10, the crossbeam 13 used as the reference adopts the support crossbeam 133, and the support crossbeam 133 is used as the reference, and the bottom plate 2 and the carried battery cell group 3 are alternately connected with the heat exchange crossbeam 132 in sequence. In other words, in the first assembly part 10, except for the crossbeam 13 used as the reference adopts the support crossbeam 133, the other crossbeams 13 connected in sequence all adopt the heat exchange crossbeam 132. In the second assembly part 20, the crossbeams 13 connected between the first longitudinal beam 11 and the second longitudinal beam 12 all adopt the support crossbeam 133.

[0157] In step S2, the first assembly part 10 is moved into the second assembly part 20, and the supporting 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 supporting beam 133 in the second assembly part 20 is arranged at intervals with the outermost supporting beam 133 or heat exchange beam 132 in the first assembly part 10 along the arrangement direction, and the bottom plate 2 is connected between the supporting beam 133 in the second assembly part 20 and the outermost supporting beam 133 or heat exchange beam 132 in the first assembly part 10, and the heat exchange beam 132 and the supporting 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 Figure 13-Figure 15As shown, the first assembly part 10 starts along the alternating connection direction with the support beam 133 serving as a reference. After the first assembly part 10 moves into the second assembly part 20, the support beam 133 serving as a reference is arranged at intervals with the support beam 133 of the second assembly part 20, 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 the bottom plate 2 and the carried battery cell group 3, after the first assembly part 10 moves into the second assembly part 20, the bottom plate 2 at the end is connected to the supporting beam 133 of the second assembly part 20; if the end of the first assembly part 10 along the alternating connection direction is the heat exchange beam 132, after the first assembly part 10 moves into the second assembly part 20, the heat exchange beam 132 at the end is arranged at intervals with the supporting beam 133 of the second assembly part 20, and the bottom plate 2 is connected between the heat exchange beam 132 and the supporting beam 133.

[0160] Preferably, in the first assembly part 10, the ends arranged by two supporting beams 133 are the bottom plate 2 and the carried battery cell group 3, and the bottom plates 2 and the carried battery cell group 3 at the two ends are arranged relatively to each other in the left-right direction. After the first assembly part 10 moves into the second assembly part 20, the supporting beam 133 located in the middle of the second assembly part 20 is connected between the bottom plates 2 at the two 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 through the connecting bolts 14 and the fixing bolts 15, and are connected to the supporting beams 133 through the fixing bolts 15.

[0162] The structural strength of the battery pack and the structural stability of the battery pack during assembly are ensured by the support beam 133 , and the heat exchange beam 132 is used to dissipate heat and cool the battery cell group 3 when the battery pack is running.

[0163] In some embodiments, 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 bottom plate 2 and the supported battery cell group 3 are alternately connected to the crossbeam 13 in sequence, wherein each crossbeam 13 connected in sequence is connected between the first positioning beam 30 and the second positioning beam 40 to define the position of each bottom plate 2, battery cell group 3 and each crossbeam 13 connected in sequence relative to the crossbeam 13 serving as a reference.

[0164] like Fig. 9As shown, the first positioning beam 30 and the second positioning beam 40 both extend in the left-right direction and are arranged at intervals in the front-back direction. The threaded holes for the connecting bolts 14 and the fixing bolts 15 provided on the first positioning beam 30 are consistent with the positions of the threaded holes for the connecting bolts 14 and the fixing bolts 15 provided on the first longitudinal beam 11. The threaded holes for the connecting bolts 14 and the fixing bolts 15 provided on the second positioning beam 40 are consistent with the positions of the threaded holes for the connecting bolts 14 and the fixing bolts 15 provided on the second longitudinal beam 12. Preferably, the shape, structure and dimensions of the first positioning beam 30 are consistent with those of the first longitudinal beam 11, and the shape, structure and dimensions of the second positioning beam 40 are consistent with those of the second longitudinal beam 12.

[0165] In step S1, the first positioning beam 30 is connected to the front end of the two support beams 133 as the reference, and the second positioning beam 40 is connected to the rear end of the two support beams 133 as the reference. Then, the base plate 2 and the supported battery cell group 3 are alternately connected to the heat exchange beams 132 by the support beams 133 as the reference, and each time a heat exchange beam 132 is connected in sequence, the heat exchange beam 132 is bolted between the first positioning beam 30 and the second positioning beam 40 to limit the heat exchange beam 132 and the support beams 133 as the reference. The distance between the supporting beams 133 is defined, and the distance between the previous bottom plate 2 and the carried battery cell group 3 and the supporting beams 133 is defined by the heat exchange beams 132, so that after the first assembly part 10 is moved into the second assembly part 20, all the supporting beams 133 and the heat exchange beams 132 in the first assembly part 10 are connected between the first longitudinal beam 11 and the second longitudinal beam 12, without having to adjust the positions of the supporting beams 133, the heat exchange beams 132, the bottom plate 2 and the battery cell group 3 in the first assembly part 10 again.

[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, and then the first positioning beam 30 and the second positioning beam 40 are removed, and then the first assembly part 10 clamped by the clamping member 50 is moved into the second assembly part 20, and then the cross beam 13 of the first assembly part 10 is connected between the first longitudinal beam 11 and the second longitudinal beam 12, and then the clamping member 50 is removed.

[0167] like Figure 12-Figure 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 support beam 133 as a reference and the whole body of the heat exchange beam 132, which is alternately connected to the bottom plate 2 and the battery cell group 3 carried by the support beam 133 in sequence, in the left-right direction, so as to maintain the distance between the heat exchange beam 132, the bottom plate 2 and the battery cell group 3 and the support beam 133 as a reference. Preferably, at least two clamping members 50 are arranged at intervals in the front-to-back direction on the same whole body.

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

[0169] Then, the first assembling part 10 clamped by the clamping member 50 is moved into the second assembling part 20 .

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

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

[0172] The clamping member 50 is used to limit the distance between the heat exchange beam 132, the bottom plate 2 and the battery cell group 3 relative to the support beam 133 serving as their reference, so as 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 ensure that all the heat exchange beams 132 and support beams 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 part 10 is connected above the second assembly part 20, and the horizontal position of the crossbeam 13 as a reference is constant relative to the second assembly part 20. In step S2, the first assembly part 10 that has been connected is lowered relative to the second assembly part 20 and falls into the second assembly part 20.

[0174] like Figure 8-Figure 15 As shown, in step S1, the second assembly part 20 is assembled before the first assembly part 10, and then the support beam 133 used as a reference in the first assembly part 10 is placed in the second assembly part 20. After the installation position of the support beam 133 used as a reference relative to the second assembly part 20 in the horizontal plane is determined, the support beam 133 used as a reference is moved vertically upward, and the assembly of the first assembly part 10 is carried out and completed above the second assembly part 20. During the assembly process of the first assembly part 10, the position of the support beam 133 used as a reference 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 moved downward and dropped into the second assembly part 20, and the support beam 133 returns to the installation position in the second assembly part 20. Since the installation position of the support beam 133 is determined, the distance between the bottom 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 clamp 50. Therefore, all the support beams 133 and the heat exchange beams 132 of the first assembly part 10 are opposite to the threaded holes for installing the connecting bolts 14 and the fixing bolts 15 on the first longitudinal beam 11 and the second longitudinal beam 12. Directly installing the connecting bolts 14 and the fixing bolts 15 can quickly connect all the support beams 133 and the 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 more efficient.

[0176] In some embodiments, the battery pack assembly method of the embodiment of the present invention also includes step S3, which includes setting a top pressing component 5, wherein the top pressing component 5 is connected to the top of at least two beams 13 and abuts against the top of the battery cell group 3.

[0177] like Fig.15 As shown, after step S2 is completed, the pressing assembly 5 is detachably connected to the top of at least two supporting beams 133, and the pressing assembly 5 is abutted against the top of all the battery cell groups 3, so that the position of the battery cell group 3 in the up and down direction is limited by the pressing assembly 5 and the bottom plate 2.

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

[0179] In step S3 , multiple pressure strips 51 are arranged at intervals along the arrangement direction of the battery cells 31 , and the battery cells 31 are abutted between the bottoms of two adjacent pressure strips 51 , and the tops of the battery cells 31 are abutted against the bosses 511 , and then the pressure strips 51 are connected to the tops of at least two beams 13 .

[0180] like Fig.15 As shown, a plurality of detachably connected pressure strips 51 are provided between the tops of adjacent supporting beams 133 of the battery cell group 3, the pressure strips 51 extend in the left-right direction, and the plurality of pressure strips 51 are arranged at intervals in the front-back direction, and each battery cell 31 of the battery cell group 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 are abutted against the boss 511 of the corresponding pressure strip 51, so that the battery cell 31 is installed stably and the spacing between adjacent battery cells 31 in the battery cell group 3 is ensured.

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

[0182] In some embodiments, in step S1, during the process of alternately connecting the bottom plate 2 and the cell group 3 to the crossbeam 13, a stopper is provided between adjacent cells 31 of the cell group 3. In step S3, the stopper is 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, in the process of alternately connecting the bottom plate 2 and the cell group 3 with the cross beam 13, a limiter is set between adjacent cells 31 of the cell group 3. The limiter may also be a limiter block, and the size of the limiter block along the front-to-back direction is consistent with the size of the bottom of the pressure strip 51 along the front-to-back direction, so as to limit the spacing between adjacent cells 31 of the cell group 3. The limiter may also be a limiter bar, and the size of the limiter bar along the front-to-back direction is consistent with the size of the bottom of the pressure strip 51 along the front-to-back direction. The limiter bar extends in the left-right direction to limit the spacing between adjacent cells 31 of the cell group 3 in the same position in the front-to-back direction. Preferably, the limiter is a limiter bar, and after the first row of cell groups 3 are arranged using the support cross beam 133 as a reference, a plurality of limiter bars are set on the cell group 3, and the cells 31 in the plurality of cell groups 3 arranged subsequently are placed on the corresponding bottom plate 2 according to the position of the limiter bar. In step S3 , the limiting member is first taken out, and then the pressure strip 51 is installed, so as to facilitate the installation of the pressure strip 51 , without adjusting the position of the battery cell 31 again, so that the battery pack assembly method has a higher efficiency.

[0184] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0185] In addition, the terms "first" and "second" are only used for distinction, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0186] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0187] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0188] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0189] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A battery pack, characterized in that: include: A frame assembly (1), a bottom plate (2) and a battery cell group (3), wherein the frame assembly (1) comprises a first longitudinal beam (11), a second longitudinal beam (12) and a plurality of cross beams (13), wherein the plurality of cross beams (13) are arranged at intervals and connected between the first longitudinal beam (11) and the second longitudinal beam (12), wherein the bottom plate (2) is arranged between adjacent cross beams (13), wherein the bottom plate (2) and the cross beams (13) are detachably connected, wherein the battery cell group (3) is arranged between at least some of the adjacent cross beams (13), and wherein the battery cell group (3) is carried on the bottom plate (2).

2. The battery pack according to claim 1, characterized in that: The bottom plate (2) is connected to the bottom of the crossbeam (13) by clamping.

3. The battery pack according to claim 2, characterized in that: The bottom of the crossbeam (13) is provided with a crossbeam clamping platform (131), and the crossbeam clamping platform (131) extends toward another crossbeam (13) adjacent to the crossbeam (13). The side wall of the bottom plate (2) is provided with a first clamping groove (21), and the crossbeam clamping platform (131) is fitted in the first clamping groove (21).

4. The battery pack according to claim 3, characterized in that: A sealing rubber layer (4) is provided between the crossbeam clamping platform (131) and the groove wall surface of the first clamping groove (21).

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

6. The battery pack according to claim 5, characterized in that: The bottom of the first longitudinal beam (11) and the bottom of the second longitudinal beam (12) are both connected to the bottom plate (2) by snap-fitting.

7. The battery pack according to claim 6, characterized in that: The bottom of the first longitudinal beam (11) has a first longitudinal beam bracket (111), the first longitudinal beam bracket (111) extends toward the second longitudinal beam (12), the bottom of the second longitudinal beam (12) has a second longitudinal beam bracket, the second longitudinal beam bracket extends toward the first longitudinal beam (11), the end wall of the bottom plate (2) is provided with a second bracket, the first longitudinal beam bracket (111) and the second longitudinal beam bracket are matched in the corresponding second bracket.

8. The battery pack according to claim 7, characterized in that: A sealing rubber layer (4) is provided between the first longitudinal beam clamping platform (111) and the corresponding groove wall surface of the second clamping groove, and a sealing rubber layer (4) is provided between the second longitudinal beam clamping platform and the corresponding groove wall surface of the second clamping groove.

9. The battery pack according to claim 1, characterized in that: The crossbeam (13) comprises a heat exchange crossbeam (132), a heat exchange channel for the flow of a heat exchange medium is provided inside the heat exchange crossbeam (132), and the heat exchange crossbeam (132) is located between adjacent battery cell groups (3).

10. The battery pack according to claim 9, characterized in that: A shunt channel for the flow of a heat exchange medium is provided inside the first longitudinal beam (11), a converging channel for the flow of a heat exchange medium is provided inside the second longitudinal beam (12), and the heat exchange channel of the heat exchange cross beam (132) is connected between the shunt channel and the converging channel.

11. The battery pack according to claim 10, characterized in that: The frame assembly (1) further comprises a connecting bolt (14), wherein a connecting channel is provided inside the connecting bolt (14), and the connecting bolt (14) comprises a first connecting bolt and a second connecting bolt, wherein the first connecting bolt connects the first longitudinal beam (11) and the heat exchange cross beam (132), and the connecting channel of the first connecting bolt connects the diversion channel and the heat exchange channel, and the second connecting bolt connects the second longitudinal beam (12) and the heat exchange cross beam (132), and the connecting channel of the second connecting bolt connects the converging channel and the heat exchange channel.

12. The battery pack according to claim 9, characterized in that: The crossbeam (13) comprises a supporting crossbeam (133), there are at least two supporting crossbeams (133), a plurality of heat exchange crossbeams (132) arranged at intervals are arranged between at least some of the adjacent supporting crossbeams (133), and the battery cell group (3) is arranged between the supporting crossbeam (133) and the adjacent heat exchange crossbeam (132).

13. The battery pack according to claim 12, characterized in that: It also includes a top pressing component (5), which is connected to the top of the frame component (1) and abuts against the top of the battery cell group (3).

14. The battery pack according to claim 13, characterized in that: The top-pressing assembly (5) comprises a pressure strip (51), wherein the pressure strip (51) is detachably connected to at least a portion of the supporting crossbeam (133) and abuts against the top of the battery cell group (3).

15. The battery pack according to claim 14, characterized in that: The battery cell group (3) comprises at least two battery cells (31) arranged at intervals, a plurality of pressure strips (51) are arranged at the top of the battery cell group (3), the plurality of pressure strips (51) are arranged at intervals along the arrangement direction of the battery cells (31) of the battery cell group (3), a boss (511) extending along the spaced arrangement direction of the pressure strips (51) is arranged at the top of the pressure strips (51), along the arrangement direction of the plurality of pressure strips (51), the bottom of the pressure strip (51) located at the outermost end is arranged outside the battery cell (31) at the outermost end, and the boss (511) of the pressure strip (51) located at the outermost end abuts against the top of the battery cell (31) at the outermost end, 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 tops of adjacent battery cells (31).

16. The battery pack according to claim 13, characterized in that: The pressing assembly (5) comprises a cover plate (52), wherein the cover plate (52) is connected to the first longitudinal beam (11), the second longitudinal beam (12), and the outermost supporting cross beam (133) along the direction in which the plurality of cross beams (13) are arranged in an interval.

17. The battery pack according to claim 14, characterized in that: It also includes at least one of a foam layer (6), an insulating sheet (7) and a plastic plate (8); The foam layer (6) is provided between the supporting crossbeam (133) and the battery cell group (3), and / or between the heat exchange crossbeam (132) and the battery cell group (3); The insulating sheet (7) is provided between the heat exchange cross beam (132) and the battery cell group (3), between the bottom plate (2) and the battery cell group (3), and between the pressure strip (51) and the battery cell group (3); The plastic plate (8) is provided between the supporting crossbeam (133) and the battery cell group (3).

18. A battery pack assembly method, characterized in that: include: S1, taking at least one crossbeam (13) as a reference, and alternately connecting the bottom plate (2) and the battery cell group (3) supported thereon to the crossbeam (13) in sequence, thereby forming 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), thereby forming a second assembly part (20); S2. Move the first assembly part (10) into the second assembly part (20), the cross beam (13) 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 cross beam (13) in the second assembly part (20) is arranged at intervals from the outermost cross beam (13) in the first assembly part (10) along the arrangement direction, the bottom plate (2) is connected between the cross beam (13) in the second assembly part (20) and the outermost cross beam (13) in the first assembly part (10), and the cross beam (13) in the first assembly part (10) is connected between the first longitudinal beam (11) and the second longitudinal beam (12).

19. The battery pack assembly method according to claim 18, characterized in that: The crossbeam (13) comprises a heat exchange crossbeam (132) and a supporting crossbeam (133); a heat exchange channel for the flow of heat exchange medium is provided inside the heat exchange crossbeam (132); In step S1, at least one of the supporting crossbeams (133) is used as a reference, and the bottom plate (2) and the battery cell group (3) supported thereon are alternately connected to the heat exchange crossbeam (132) in sequence, thereby forming the first assembly part (10); at least one of the supporting crossbeams (133) other than the supporting crossbeam (133) of the first assembly part (10) is connected between the first longitudinal beam (11) and the second longitudinal beam (12), thereby forming 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).

20. The battery pack assembly method according to claim 18, characterized in that: In step S1, the crossbeam (13) serving as a reference is connected between a first positioning beam (30) and a second positioning beam (40), and then the bottom plate (2) and the battery cell group (3) supported thereon are alternately connected to the crossbeam (13) in sequence, wherein each crossbeam (13) connected in sequence is connected between the first positioning beam (30) and the second positioning beam (40) to define the position of each bottom plate (2), the battery cell group (3) and each crossbeam (13) connected in sequence 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 a clamping member (50), and then the first positioning beam (30) and the second positioning beam (40) are removed, and then the first assembly part (10) clamped by the clamping member (50) is moved into the second assembly part (20), and then the cross beam (13) of the first assembly part (10) is connected between the first longitudinal beam (11) and the second longitudinal beam (12), and then the clamping member (50) is removed.

21. The battery pack assembly method according to claim 18, characterized in that: In step S1, the first assembly part (10) is connected above the second assembly part (20), and the horizontal position of the crossbeam (13) serving as a reference relative to the second assembly part (20) is constant; In step S2, the first assembly part (10) that has been connected is lowered relative to the second assembly part (20) and falls into the second assembly part (20).

22. The battery pack assembly method according to claim 18, characterized in that: Also includes: S3. A top pressing component (5) is provided, wherein the top pressing component (5) is connected to the tops of at least two of the cross beams (13) and abuts against the top of the battery cell group (3).

23. The battery pack assembly method according to claim 22, characterized in that: The battery cell group (3) comprises at least two battery cells (31) arranged at intervals, the top pressing assembly (5) comprises a plurality of pressure strips (51), and a boss (511) is provided on the top of each pressure strip (51); In step S3, a plurality of the pressure strips (51) are arranged at intervals along the arrangement direction of the battery cells (31), and the battery cells (31) are abutted between the bottoms of two adjacent pressure strips (51), and the tops of the battery cells (31) are abutted against the bosses (511), and then the pressure strips (51) are connected to the tops of at least two of the cross beams (13).

24. The battery pack assembly method according to claim 23, characterized in that: In step S1, in the process of alternately connecting the bottom plate (2) and the battery cell group (3) to the crossbeam (13), a stopper is provided between adjacent battery cells (31) of the battery cell group (3); In step S3, the limiting member is first taken out, and then a plurality of the pressing strips (51) are arranged at intervals along the arrangement direction of the battery cells (31).

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