Assembling method of battery pack, battery pack and vehicle

Abstract

The invention relates to an assembling method of a battery pack, the battery pack and a vehicle, the assembling method of the battery pack comprises the following steps: a first cross beam, a second cross beam and a plurality of battery cells are stacked according to preset positions to form an assembling assembly, the plurality of battery cells are located between the first cross beam and the second cross beam in a first direction, and the second cross beam is located between the first cross beam and the second cross beam in a second direction; the first cross beam and the second cross beam extend in the second direction, and the second direction is perpendicular to the first direction. A clamp is used for clamping the assembling assembly in the first direction, the assembling assembly is installed in the battery pack frame, a longitudinal beam is installed in the battery pack frame, the longitudinal beam is arranged on the outer side of the assembling assembly and extends in the first direction, and the inner end of the longitudinal beam abuts against the first cross beam or the second cross beam; and taking out the clamp from the battery pack frame body, and connecting the battery pack cover body with the battery pack frame body. According to the battery pack assembling method disclosed by the embodiment of the invention, the development time of a new energy automobile is shortened, and the development cost of the new energy automobile is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power batteries, and in particular to a battery pack assembly method, a battery pack, and a vehicle. Background Art

[0002] With the continuous development of new energy vehicles, the configuration of battery packs with different energy densities for the same model to meet the user's requirements for different cruising ranges has become a major development trend in the development of new energy vehicles. At present, the energy density of the battery pack is mainly adjusted by adjusting the outer dimensions of the battery pack, but the above scheme has the problems of long development time and high development cost. If the internal structure of the battery pack box is changed without changing the outer dimensions of the battery pack box, such as the size of the beam body in the battery pack box, the accommodating cavity for accommodating the battery cell in the battery pack box can be changed, and the battery packs of the same outer dimensions can have different energy densities. Therefore, in the development stage of new energy vehicles, the same model can only be set with battery packs of the same outer dimensions, and the internal structure of the battery pack box can be changed in the assembly section of the battery pack box, so that the energy density of the battery pack configured for the same model is different, thereby shortening the development time of new energy vehicles and reducing the development cost of new energy vehicles. Therefore, how to make the battery pack box of the same outer dimensions have different accommodating cavities is a technical problem that needs to be solved urgently. Summary of the invention

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

[0004] To this end, an embodiment of the present disclosure provides a method for assembling a battery pack so that a battery pack box with the same outer dimensions has different accommodating cavities.

[0005] The battery pack assembly method of the present disclosure includes the following steps:

[0006] Stacking a first crossbeam, a second crossbeam, and a plurality of battery cells in a preset position to form an assembly component, wherein the plurality of battery cells are located between the first crossbeam and the second crossbeam in a first direction, and the first crossbeam and the second crossbeam both extend along a second direction, and the second direction is perpendicular to the first direction;

[0007] Clamping the assembly component along the first direction with a clamp, and installing the assembly component into a battery pack frame, and installing a longitudinal beam into the battery pack frame, wherein the longitudinal beam is arranged outside the assembly component and extends along the first direction, and the inner end of the longitudinal beam abuts against the first cross beam or the second cross beam;

[0008] The clamp is taken out from the battery pack frame, and the battery pack cover is connected to the battery pack frame.

[0009] Optionally, stacking the first crossbeam, the second crossbeam and the plurality of battery cells at preset positions to form an assembly component comprises:

[0010] First, a first thermal insulation member is fixed on the surface of the first beam, and then the first beam, the second beam and the plurality of battery cells are stacked and arranged according to a preset position, wherein the first thermal insulation member is located between the first beam and the battery cells; and / or, a second thermal insulation member is first fixed on the surface of the second beam, and then the first beam, the second beam and the plurality of battery cells are stacked and arranged according to a preset position, wherein the second thermal insulation member is located between the second beam and the battery cells.

[0011] Optionally, stacking the first crossbeam, the second crossbeam and the plurality of battery cells at preset positions to form an assembly component comprises:

[0012] The plurality of battery cells and the plurality of elastic members are alternately stacked in sequence along the first direction to form at least one battery cell row, so that an elastic member is arranged between any two adjacent battery cells in the same battery cell row.

[0013] Optionally, stacking the first crossbeam, the second crossbeam and the plurality of battery cells at preset positions to form an assembly component comprises:

[0014] First, a plurality of the battery cells and a plurality of the elastic members are alternately stacked in sequence along the first direction to form a battery cell row;

[0015] Then, placing a filler on one side of the one battery cell row in the second direction;

[0016] Afterwards, on the side of the filling member away from the one battery cell row, the plurality of battery cells and the plurality of elastic members are alternately stacked in sequence along the first direction to form another battery cell row, so that the assembly component includes the plurality of battery cell rows arranged in sequence along the second direction, and the plurality of battery cells are arranged in a matrix form of multiple rows and columns in the first direction and the second direction.

[0017] Optionally, the battery pack assembly method further includes:

[0018] When the size of the assembly component in the first direction is greater than a preset value, the size of the assembly component in the first direction is adjusted by increasing the clamping force of the clamp so that the inner end of the longitudinal beam abuts against the first cross beam or the second cross beam.

[0019] Optionally, clamping the assembly component along the first direction using a clamp and inserting the assembly component into the battery pack frame includes:

[0020] First, glue is applied to the battery pack frame to form a bonding area;

[0021] Then, the assembly component is installed into the battery pack frame corresponding to the bonding area, so that the assembly component is bonded to the battery pack frame.

[0022] Optionally, stacking the first crossbeam, the second crossbeam and the plurality of battery cells at preset positions to form an assembly component comprises:

[0023] An assembly platform is provided, and the first crossbeam, the second crossbeam and the plurality of battery cells are placed on the assembly platform and stacked according to preset positions to form the assembly component, so that the bottom surfaces of the plurality of battery cells are flush.

[0024] Optionally, the battery pack assembly method further includes:

[0025] After the assembly component is installed into the battery pack frame, the two ends of the first crossbeam respectively abut against two frame frames of the battery pack frame that are oppositely arranged in the second direction, and the two ends of the second crossbeam respectively abut against two frame frames of the battery pack frame that are oppositely arranged in the second direction; and / or, after the longitudinal beam is installed into the battery pack frame, the outer end of the longitudinal beam abuts against one of the frame frames of the battery pack frame.

[0026] Optionally, the battery pack assembly method further includes:

[0027] Before removing the clamp from the battery pack frame, the first cross beam and the second cross beam are connected to the battery pack frame; and / or before removing the clamp from the battery pack frame, the longitudinal beam is connected to the battery pack frame.

[0028] Optionally, the assembly component is first installed in the battery pack frame, and then the assembly component is moved along the first direction to adjust the position of the assembly component in the first direction, and then the longitudinal beam is installed in the battery pack frame.

[0029] An embodiment of the present disclosure also provides a battery pack.

[0030] The battery pack of the embodiment of the present disclosure is assembled using the battery pack assembly method described in any of the above embodiments.

[0031] Optionally, a plurality of the battery cells are stacked at a preset position to form at least one battery cell row, wherein each battery cell row comprises a plurality of the battery cells stacked sequentially along the first direction;

[0032] An elastic member is arranged between at least two of the battery cells in the same battery cell row, and / or at least one of the battery cells in the same battery cell row is a model battery cell.

[0033] Optionally, the battery pack frame includes a bottom plate, a surface of the bottom plate facing the assembly component has a bonding area, and a surface of the assembly component facing the bottom plate has a connecting area, and the connecting area is bonded to the bonding area;

[0034] The dimension of the bonding area in the first direction is greater than the dimension of the assembly component in the first direction, and / or the ratio of the area of ​​the connection area to the surface area of ​​the assembly component facing the base plate is greater than or equal to 0.9.

[0035] Optionally, the battery pack frame includes multiple frames, and the multiple frames are connected in sequence; the two ends of the first crossbeam and the second crossbeam respectively abut against two frames arranged opposite to each other in the second direction, and / or the outer end of the longitudinal beam abuts against one of the frames.

[0036] Optionally, at least one of the first crossbeam, the second crossbeam and the longitudinal beam is connected to the battery pack frame by a fastener;

[0037] A fixing piece for connecting with the fastener is arranged in the battery pack frame, and the fixing piece can move relative to the battery pack frame, and / or a plurality of fixing holes for connecting with the fastener are arranged in the battery pack frame.

[0038] Optionally, the battery pack frame includes multiple frames, and the multiple frames are connected in sequence; a receiving groove is formed between the first cross beam and the frame, and between the second cross beam and the frame, and the receiving groove is arranged on the outside of the assembly component, and multiple longitudinal beams are installed in each receiving groove, and the multiple longitudinal beams in the same receiving groove are arranged at intervals along the second direction.

[0039] An embodiment of the present disclosure also provides a vehicle.

[0040] The vehicle of the disclosed embodiment includes the battery pack described in any of the above embodiments.

[0041] The assembly method of the battery pack of the disclosed embodiment is to stack the first crossbeam, the second crossbeam and the plurality of cells in a preset position to form an assembly assembly. The energy density of the battery pack can be adjusted by increasing or decreasing the number of cells in the assembly assembly, and the increase or decrease in the number of cells can only affect the size of the assembly assembly in the first direction. Afterwards, after the assembly assembly and the longitudinal beam are installed in the battery pack frame, a receiving cavity is formed between the longitudinal beam and the frame of the battery pack frame, and the assembly assembly is located in the receiving cavity. The frame can change the size of the receiving cavity by changing the size of the longitudinal beam in the first direction so that the receiving cavity is adapted to the assembly assembly with different sizes in the first direction. The inner end of the longitudinal beam is abutted against the first crossbeam or the second crossbeam, so that the overall strength of the battery pack frame can be ensured. Among them, the longitudinal beam and the frame of the battery pack frame form a receiving cavity for accommodating the assembly assembly, and the crossbeam and the longitudinal beam both play a role in increasing the strength of the battery pack frame. The battery pack frame and the battery pack cover form a battery pack box. As a result, the battery pack box with the same outer size can have different receiving cavities, thereby shortening the development time of new energy vehicles and reducing the development cost of new energy vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 The figure is a flow chart of a method for assembling a battery pack according to an embodiment of the present disclosure.

[0043] Figure 2 It is a structural schematic diagram of the assembly components during the battery pack assembly process of one embodiment of the present disclosure.

[0044] Figure 3 It is a schematic diagram of the structure of a fixture clamping an assembly component during a battery pack assembly process according to an embodiment of the present disclosure.

[0045] Figure 4 A schematic diagram of the structure of the connection between the longitudinal beam and the battery pack frame during the battery pack assembly process according to an embodiment of the present disclosure.

[0046] Figure 5 It is a structural schematic diagram of a battery pack in which a clamp is removed from a battery pack frame during assembly of a battery pack according to an embodiment of the present disclosure.

[0047] Figure 6 yes Figure 5 Schematic diagram of the structure of the battery pack frame.

[0048] Figure 7 yes Figure 6 Enlarged view of point A in the middle.

[0049] Figure 8 yes Figure 7 Schematic diagram of the structure of the fixing parts.

[0050] Fig. 9 It is a schematic structural diagram of a battery pack frame of a battery pack according to another embodiment of the present disclosure.

[0051] Fig.10 yes Fig. 9 Enlarged view of point B in the middle.

[0052] Fig.11 It is a schematic diagram of the structure of a battery pack according to an embodiment of the present disclosure.

[0053] Fig.12 FIG. 4 is an exploded view of a battery pack according to an embodiment of the present disclosure.

[0054] Reference numerals:

[0055] 100. Battery pack;

[0056] 10. Assemble components;

[0057] 20. Clamp; 201. Avoidance portion; 202. Connecting plate; 203. Clamping claw;

[0058] 1. Battery cell;

[0059] 11. first crossbeam; 12. second crossbeam; 21. crossbeam connecting hole; 22. matching portion;

[0060] 3. Battery pack frame; 31. Accommodation groove; 32. Frame; 33. Adhesive area; 34. Guide rail; 341. Guide groove; 342. Opening; 35. Thickening member; 351. Fixing hole;

[0061] 4. Battery pack cover;

[0062] 5. Longitudinal beam; 51. Longitudinal beam connection hole;

[0063] 6. Elastic parts;

[0064] 7. Fixing piece; 71. Threaded hole;

[0065] 8. Fasteners. DETAILED DESCRIPTION

[0066] Embodiments of the present disclosure 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 are intended to be used to explain the present disclosure, but should not be understood as limiting the present disclosure.

[0067] like Figures 1 to 5 , Fig.11 As shown, the assembly method of the battery pack of the embodiment of the present disclosure includes the following steps:

[0068] Step S1, stacking a first crossbeam 11, a second crossbeam 12 and a plurality of battery cells 1 in a preset position to form an assembly component 10, wherein the plurality of battery cells 1 are located between the first crossbeam 11 and the second crossbeam 12 in a first direction, and the first crossbeam 11 and the second crossbeam 12 both extend in a second direction, and the second direction is perpendicular to the first direction;

[0069] Step S2, using the clamp 20 to clamp the assembly component 10 along the first direction, and install the assembly component 10 into the battery pack frame 3, and install the longitudinal beam 5 into the battery pack frame 3, wherein the longitudinal beam 5 is arranged outside the assembly component 10 and extends along the first direction, and the inner end of the longitudinal beam 5 abuts against the first cross beam 11 or the second cross beam 12;

[0070] Step S3 , taking the fixture 20 out of the battery pack frame 3 , and connecting the battery pack cover 4 to the battery pack frame 3 , to obtain the battery pack 100 .

[0071] The preset position can be understood as: the pre-designed relative position between the plurality of battery cells 1 and the first beam 11 and the second beam 12, including the relative position between adjacent battery cells 1, and the relative position between the battery cells 1 and the first beam 11 and the second beam 12. Inward can be understood as: the direction close to the center line of the battery pack frame 3 on a plane perpendicular to the height direction of the battery pack frame 3; outward can be understood as: the direction away from the center line of the battery pack frame 3 on a plane perpendicular to the height direction of the battery pack frame 3. The longitudinal beam 5 is arranged on the outside of the assembly component 10, that is, the direction in which the longitudinal beam 5 is closer to the center line of the battery pack frame 3 relative to the assembly component 10. The inner end of the longitudinal beam 5, that is, the end of the longitudinal beam 5 close to the center line of the battery pack frame 3.

[0072] The assembly component 10 can be clamped along the first direction by the clamp 20 and loaded into the battery pack frame 3 before the longitudinal beam 5 is loaded into the battery pack frame 3. Alternatively, the longitudinal beam 5 can be loaded into the battery pack frame 3 first and then the assembly component 10 can be clamped along the first direction by the clamp 20 and loaded into the battery pack frame 3.

[0073] In the assembly method of the battery pack of the embodiment of the present disclosure, the first crossbeam 11, the second crossbeam 12 and the plurality of cells 1 are stacked and arranged in a preset position to form an assembly component 10. The energy density of the battery pack can be adjusted by increasing or decreasing the number of cells 1 in the assembly component 10, and the increase or decrease in the number of cells 1 can only affect the size of the assembly component 10 in the first direction. Afterwards, after the assembly component 10 and the longitudinal beam 5 are loaded into the battery pack frame 3, a receiving cavity is formed between the longitudinal beam 5 and the frame 32 of the battery pack frame 3, and the assembly component 10 is located in the receiving cavity. The frame 3 can change the size of the receiving cavity by changing the size of the longitudinal beam 5 in the first direction so that the receiving cavity is adapted to the assembly component 10 with different sizes in the first direction. The inner end of the longitudinal beam 5 is abutted against the first crossbeam 11 or the second crossbeam 12, so that the overall strength of the battery pack frame 3 can be ensured. Among them, the longitudinal beam 5 and the frame 32 of the battery pack frame 3 form a receiving cavity for accommodating the assembly component 10, and the first crossbeam 11, the second crossbeam 12 and the longitudinal beam 5 all play a role in increasing the strength of the battery pack frame 3. The battery pack frame 3 and the battery pack cover 4 constitute a battery pack case.

[0074] As a result, the battery pack box with the same outer dimensions can have different accommodating cavities, thereby shortening the development time of new energy vehicles and reducing the development cost of new energy vehicles.

[0075] In some embodiments, stacking a first crossbeam 11, a second crossbeam 12, and a plurality of battery cells 1 at a preset position to form an assembly component 10 includes: first fixing a first thermal insulation member on the surface of the first crossbeam 11, and then stacking the first crossbeam 11, the second crossbeam 12, and a plurality of battery cells 1 at a preset position, wherein the first thermal insulation member is located between the first crossbeam 11 and the battery cells 1.

[0076] It is understandable that heat is generated during the charging and discharging process of the battery cell 1. By setting a first thermal insulation component between the first cross beam 11 and the battery cell 1, the heat transfer efficiency between the battery cell 1 and the first cross beam 11 can be reduced, thereby reducing the heat transferred from the battery cell 1 to the longitudinal beam 5 through the first cross beam 11, effectively avoiding deformation of the first cross beam 11 and the longitudinal beam 5 due to excessive heat, which is beneficial to improving the reliability of the battery pack 100.

[0077] In some embodiments, stacking the first beam 11, the second beam 12 and the multiple battery cells 1 at a preset position to form an assembly component 10 includes: first fixing the second thermal insulation member on the surface of the second beam 12, and then stacking the first beam 11, the second beam 12 and the multiple battery cells 1 at a preset position, wherein the second thermal insulation member is located between the second beam 12 and the battery cells 1.

[0078] By providing a second thermal insulation member between the second cross beam 12 and the battery cell 1, the heat transfer efficiency between the battery cell 1 and the second cross beam 12 can be reduced, thereby reducing the heat transferred from the battery cell 1 to the longitudinal beam 5 through the second cross beam 12, effectively preventing the second cross beam 12 and the longitudinal beam 5 from being deformed due to excessive heat, which is beneficial to improving the reliability of the battery pack 100.

[0079] In order to make the technical solution of the present disclosure easier to understand, the technical solution of the present disclosure is further described below by taking the first direction being consistent with the front-to-back direction as an example. Figures 2 to 12 shown.

[0080] For example, Figure 2 As shown, the first crossbeam 11 is arranged at the front side of the plurality of battery cells 1, and the second crossbeam 12 is arranged at the rear side of the plurality of battery cells 1. The first crossbeam 11 is the front crossbeam, and the second crossbeam 12 is the rear crossbeam. A first heat insulating member and a second heat insulating member are respectively arranged between the rear side surface of the front crossbeam and the battery cells 1, and between the front side surface of the rear crossbeam and the battery cells 1. The first heat insulating member can reduce the heat transfer from the battery cells 1 to the front crossbeam, and the second heat insulating member can reduce the heat transfer from the battery cells 1 to the rear crossbeam.

[0081] Optionally, the first heat insulating member is first fixed on the surface of the first beam 11, and the second heat insulating member is fixed on the surface of the second beam 12, and then the first beam 11, the second beam 12 and the plurality of battery cells 1 are stacked and arranged according to preset positions.

[0082] For example, the first heat insulating member and the second heat insulating member are respectively bonded to the rear side of the front cross beam and the front side of the rear cross beam, and then the front cross beam, the rear cross beam and a plurality of battery cells 1 are stacked and arranged according to preset positions.

[0083] Therefore, when assembling the assembly component 10, it is only necessary to adjust the relative positions of the first cross beam 11 and the second cross beam 12 and the battery cell 1 so that the first thermal insulation component and the second thermal insulation component are located at the preset position, and there is no need to adjust the positions of the first thermal insulation component and the second thermal insulation component and the battery cell 1, which is beneficial to improving the assembly efficiency of the assembly component 10, and thus beneficial to improving the assembly efficiency of the battery pack 100.

[0084] Optionally, two sides of the first thermal insulation member are respectively bonded to the first crossbeam 11 and the battery cell 1 , and two sides of the second thermal insulation member are respectively bonded to the second crossbeam 12 and the battery cell 1 .

[0085] The two sides of the first thermal insulation member are respectively bonded to the first cross beam 11 and the battery cell 1, and the two sides of the second thermal insulation member are respectively bonded to the second cross beam 12 and the battery cell 1, so as to realize the connection between the first cross beam 11 and the battery cell 1 as well as between the second cross beam 12 and the battery cell 1, thereby effectively avoiding the low assembly accuracy of the assembly component 10 due to the relative displacement between the first cross beam 11 and the battery cell 1 as well as between the second cross beam 12 and the battery cell 1 when the assembly component 10 is accidentally touched, which is beneficial to improving the assembly accuracy of the battery pack 100.

[0086] In some embodiments, stacking the first crossbeam 11, the second crossbeam 12 and the plurality of battery cells 1 in a preset position to form an assembly component 10 includes: stacking the plurality of battery cells 1 and the plurality of elastic members 6 alternately in sequence along a first direction to form at least one battery cell row, so that an elastic member 6 is provided between any two adjacent battery cells 1 in the same battery cell row.

[0087] For example, Figures 2 to 5 As shown, the plurality of battery cells 1 form four battery cell rows, and each battery cell row includes 10 battery cells 1 stacked in sequence along the front-to-back direction.

[0088] By arranging the battery cells to include a plurality of battery cells 1 stacked in sequence along the first direction, when the number of battery cells 1 increases or decreases, only the size of the assembly component 10 in the first direction is affected, thereby facilitating the development and design of the battery pack 100, and facilitating further reducing the development cost of the battery pack 100. In addition, by arranging an elastic member 6 between any two battery cells 1, the assembly component 10 can be clamped in the first direction by the fixture 20, so that the elastic member 6 is compressed to absorb the thickness tolerance of the assembly component 10 in the first direction, reducing the risk of the assembly component 10 falling off the fixture 20, and facilitating improving the reliability of the assembly method of the battery pack.

[0089] In addition, when the battery cell 1 expands during the charge and discharge process of the battery pack 100 , the elastic member 6 can be compressed to reserve expansion space for the battery cell 1 to prevent the battery cell 1 from being crushed, which is beneficial to improving the safety of the battery pack 100 .

[0090] Optionally, in the first direction, two sides of the elastic member 6 are respectively bonded to the battery cells 1 disposed on two sides of the elastic member 6 .

[0091] In this way, two connections between multiple battery cells 1 in the same battery cell row can be achieved, so that the multiple battery cells 1 in the same battery cell row form a whole. This can effectively avoid the low assembly accuracy of the assembly component 10 due to relative displacement between the battery cells 1 in the same battery cell row when the assembly component 10 is accidentally touched, which is beneficial to improving the assembly accuracy of the battery pack 100.

[0092] Optionally, stacking the first crossbeam 11, the second crossbeam 12 and the plurality of battery cells 1 at preset positions to form an assembly component 10 includes:

[0093] First, a plurality of battery cells 1 and a plurality of elastic members 6 are alternately stacked in sequence along a first direction to form a battery cell row;

[0094] Then, a filling piece is placed on one side of a battery cell row in the second direction;

[0095] Afterwards, on the side of the filling member away from one battery cell row, multiple battery cells 1 and multiple elastic members 6 are alternately stacked in sequence along the first direction to form another battery cell row, so that the assembly component 10 includes multiple battery cell rows arranged in sequence along the second direction, and the multiple battery cells 1 are arranged in a matrix form of multiple rows and columns in the first direction and the second direction.

[0096] The material of the filling piece can be filled according to the performance requirements of the battery cell and the battery pack 100 , and the filling piece does not need to be connected to the battery cell 1 .

[0097] By arranging a filling piece between two adjacent rows of battery cells, on the one hand, the filling piece can be used to separate the adjacent rows of battery cells, thereby improving the safety of a single row of battery cells; on the other hand, when the filling piece is made of elastic material, when the battery cell 1 expands during the charging and discharging process of the battery pack 100, the filling piece can be compressed to reserve expansion space for the battery cell 1, thereby preventing the battery cell 1 from being crushed, which is conducive to further improving the safety of the battery pack 100.

[0098] In order to make the technical solution of the present disclosure easier to understand, the following takes the second direction being consistent with the left-right direction as an example to further describe the technical solution of the present disclosure, wherein the left-right direction is as follows: Figures 2 to 12 shown.

[0099] For example, a plurality of battery cells 1 and a plurality of elastic members 6 are first stacked alternately in sequence to form a first battery cell row, and then a filler is placed on the right side of the first battery cell row, and then a plurality of battery cells 1 and a plurality of elastic members 6 are stacked alternately in sequence to form a second battery cell row; thereafter, a filler is placed on the right side of the second battery cell row, and then a plurality of battery cells 1 and a plurality of elastic members 6 are stacked alternately in sequence to form a third battery cell row; finally, a filler is placed on the right side of the third battery cell row, and then a plurality of battery cells 1 and a plurality of elastic members 6 are stacked alternately in sequence to form a fourth battery cell row, so that the assembly component 10 includes four battery cell rows arranged along the left-right direction.

[0100] The assembly method of the assembly component 10 has a clear assembly sequence and is convenient for assembling the elastic member 6 and the filling member. It is not easy to cause the problem of wrong assembly, which is beneficial to further improve the assembly efficiency of the battery pack 100.

[0101] In some embodiments, Figure 6 , Fig. 9 and Fig.12 As shown, firstly, glue is applied to the battery pack frame 3 to form a bonding area 33;

[0102] Then, the assembly component 10 corresponding to the bonding area 33 is installed into the battery pack frame 3 so that the assembly component 10 is bonded to the battery pack frame 3 .

[0103] Therefore, it is convenient to connect and fix the battery cell 1 to the battery pack frame 3 , which is beneficial to further improve the assembly efficiency of the battery pack 100 .

[0104] Optionally, glue is applied to the surface of the bottom plate of the battery pack frame 3 to form the above-mentioned bonding area 33. When the bottom plate of the battery pack frame 3 is used as a heat sink, the glue applied to the surface of the battery pack frame 3 is a thermally conductive glue. For example, the bottom plate of the battery pack frame 3 is a liquid cooling plate. When the battery pack frame 3 is not used as a heat sink, the glue applied to the surface of the battery pack frame 3 is a structural glue.

[0105] It is understandable that when the bottom plate of the battery pack frame 3 is used as a heat sink, the battery cell 1 needs to dissipate heat through the cooling plate, which requires good thermal conductivity between the battery cell 1 and the cooling plate. By setting the glue liquid as a thermally conductive glue, it is beneficial to improve the heat dissipation efficiency of the battery cell 1, thereby helping to improve the reliability of the battery pack 100. When the battery pack frame 3 is not used as a heat sink, the heat transfer from the battery cell 1 to the bottom plate of the battery pack frame 3 should be minimized. By setting the glue liquid as a structural glue, it is not only beneficial to improve the connection reliability between the battery cell 1 and the battery pack frame 3, but also can effectively reduce the heat transfer from the battery cell 1 to the bottom plate of the battery pack frame 3.

[0106] Optionally, stacking the first crossbeam 11, the second crossbeam 12 and the plurality of battery cells 1 at preset positions to form an assembly component 10 includes:

[0107] An assembly platform is provided, and the first crossbeam 11, the second crossbeam 12 and the plurality of battery cells 1 are placed on the assembly platform and stacked according to preset positions to form an assembly component 10, so that the bottom surfaces of the plurality of battery cells 1 are flush.

[0108] This is beneficial to improving the uniformity of the thickness of the glue between the bottom surface of the battery cell 1 and the battery pack frame 3 , thereby further improving the connection reliability between the battery cell 1 and the battery pack frame 3 .

[0109] Alternatively, if Figure 4 and Figure 5 As shown, the battery pack assembly method includes:

[0110] After the assembly component 10 is loaded into the battery pack frame 3 , the two ends of the first crossbeam 11 respectively abut against the two frames 32 of the battery pack frame 3 that are oppositely arranged in the second direction, and the two ends of the second crossbeam 12 respectively abut against the two frames 32 of the battery pack frame 3 that are oppositely arranged in the second direction.

[0111] For example, Figure 4 and Figure 5 As shown, the battery pack frame 3 includes four frames 32, two of which are a left frame and a right frame, respectively. The left frame and the right frame are arranged at intervals along the left-right direction, and the left frame is arranged on the left side of the right frame. The left ends of the first beam 11 and the second beam 12 abut against the left frame, and the right ends of the first beam 11 and the second beam 12 abut against the frame.

[0112] As a result, the first cross beam 11 , the second cross beam 12 and the two side frames 32 of the battery pack frame 3 can transfer force to each other, which is beneficial to further improve the structural strength of the battery pack frame 3 , thereby further improving the structural strength of the battery pack 100 .

[0113] Alternatively, if Figure 4 and Figure 5 As shown, the battery pack assembly method includes: after the longitudinal beam 5 is installed in the battery pack frame 3 , the outer end of the longitudinal beam 5 abuts against one of the frames 32 of the battery pack frame 3 .

[0114] For example, Figure 4 and Figure 5 As shown, two of the four frames 32 are respectively the front frame and the rear frame, the front frame and the rear frame are arranged at intervals along the front-to-back direction, and the front frame is arranged at the front side of the rear frame. There are four left longitudinal beams 5, of which four longitudinal beams 5 are front longitudinal beams, and the other two longitudinal beams are rear longitudinal beams, the front longitudinal beam and the rear longitudinal beam are arranged at intervals along the front-to-back direction, and the front longitudinal beam is arranged at the front side of the rear longitudinal beam. Among them, the front longitudinal beam has a front end abutting against the front frame, and a rear end abutting against the front cross beam; the rear end of the rear longitudinal beam abuts against the rear frame, and the front end abuts against the rear cross beam.

[0115] As a result, the longitudinal beam 5 and the frame 32 of the battery pack frame 3 can transfer force to each other, which is beneficial to further improve the structural strength of the battery pack frame 3, thereby further improving the structural strength of the battery pack 100.

[0116] Optionally, the battery pack assembly method includes:

[0117] Before taking the clamp 20 out of the battery pack frame 3 , the first crossbeam 11 and the second crossbeam 12 are connected to the battery pack frame 3 .

[0118] By connecting the first cross beam 11 and the second cross beam 12 to the battery pack frame 3 , the first cross beam 11 and the second cross beam 12 and the battery pack frame 3 form a stable whole, which is beneficial to further improve the structural strength of the battery pack frame 3 , thereby helping to further improve the structural strength of the battery pack 100 .

[0119] Optionally, the battery pack assembly method includes: before removing the clamp 20 from the battery pack frame 3 , connecting the longitudinal beam 5 to the battery pack frame 3 .

[0120] By connecting the longitudinal beam 5 to the battery pack frame 3 , the longitudinal beam 5 and the battery pack frame 3 form a stable whole, which is beneficial to further improve the structural strength of the battery pack frame 3 , thereby helping to further improve the structural strength of the battery pack 100 .

[0121] Optionally, the assembly component 10 is first loaded into the battery pack frame 3 of the battery pack 100 , and then the assembly component 10 is moved along the first direction to adjust the position of the assembly component 10 in the first direction, and then the longitudinal beam 5 is loaded into the battery pack frame 3 .

[0122] Thus, the longitudinal beams 5 of different lengths can be easily abutted against the first cross beam 11 or the second cross beam 12 , which is beneficial to further improve the assembly efficiency of the battery pack 100 .

[0123] Alternatively, if Figure 3 and Figure 4 As shown, the clamp 20 is provided with an escape portion 201 , and the inner end of the longitudinal beam 5 abuts against the first cross beam 11 or the second cross beam 12 through the escape portion 201 .

[0124] For example, Figure 3 and Figure 4 As shown, the clamp 20 includes two clamp arms arranged in pairs, each clamp arm includes a connecting plate 202 and a plurality of clamp claws 203, and the plurality of clamp claws 203 are arranged at intervals along the left-right direction and are all connected to the connecting plate 202. In the second direction, an escape portion 201 is formed between two adjacent clamp claws 203. The clamp claws 203 are used to clamp the first beam 11 and the second beam 12 along the first direction.

[0125] Providing the avoidance portion 201 on the clamp 20 is beneficial to improving the clamping stability of the clamp 20 on the assembly component 10 and facilitating the installation and fixation of the longitudinal beam 5 .

[0126] The battery pack 100 of the embodiment of the present disclosure is assembled using the battery pack assembly method described in any of the above embodiments.

[0127] Since the assembly method of the battery pack of the embodiment of the present disclosure can enable the battery pack body of the same outer size to have different accommodating cavities, thereby shortening the development time of new energy vehicles and reducing the development cost of new energy vehicles, the battery pack 100 of the embodiment of the present disclosure has the advantages of low development cost, etc.

[0128] In some embodiments, a first thermal insulation member is provided between the first cross beam 11 and the battery cell 1 .

[0129] The first thermal insulation can reduce the heat transfer efficiency between the battery cell 1 and the first cross beam 11 , thereby reducing the heat transferred from the battery cell 1 to the longitudinal beam 5 through the first cross beam 11 , effectively preventing the first cross beam 11 and the longitudinal beam 5 from deforming due to excessive heat, which is beneficial to improving the reliability of the battery pack 100 .

[0130] In some embodiments, a second thermal insulation member is disposed between the second cross beam 12 and the battery cell 1 .

[0131] The second thermal insulation component can reduce the heat transfer efficiency between the battery cell 1 and the second cross beam 12, thereby reducing the heat transferred from the battery cell 1 to the longitudinal beam 5 through the second cross beam 12, effectively preventing the second cross beam 12 and the longitudinal beam 5 from deforming due to excessive heat, which is beneficial to improving the reliability of the battery pack 100.

[0132] Optionally, the first thermal insulation member and the second thermal insulation member are in sheet form, and the material of the first thermal insulation member and the second thermal insulation member can be determined according to different battery cells 1 and the temperature difference thermal insulation effect of the battery cells 1, and specifically can be ceramic, polycarbonate, aerogel, etc.

[0133] In some embodiments, multiple battery cells 1 are stacked at a preset position to form at least one battery cell row, wherein each battery cell row includes multiple battery cells 1 stacked in sequence along a first direction, and an elastic member 6 is arranged between at least two battery cells 1 in the same battery cell row.

[0134] By arranging an elastic member 6 between any two battery cells 1, the assembly component 10 can be clamped in the clamp 20 along the first direction, so that the elastic member 6 is compressed to absorb the thickness tolerance of the assembly component 10 in the first direction, thereby reducing the risk of the assembly component 10 falling off the clamp 20, which is beneficial to improving the reliability of the battery pack assembly method.

[0135] Optionally, the elastic member 6 is in a sheet shape, and the gap between any two adjacent battery cells 1 in the first direction is filled with the elastic member 6 .

[0136] Therefore, when the clamp 20 clamps the assembly component 10 along the first direction, it can effectively prevent the tilt between two adjacent battery cells 1, which may cause the assembly component 10 to fall off due to unstable force, which is beneficial to further improve the reliability of the battery pack assembly method.

[0137] Optionally, at least one battery cell 1 in the same battery cell row is a model battery cell, wherein the model battery cell can be understood as a fake battery cell having the same outer dimensions as a real battery cell.

[0138] It is understandable that in the related art, when the number of cells 1 in each cell row is different, the output pole arrangement is usually different. For example, when the number of cells 1 in the cell row is an even number, the output poles are usually arranged on both sides of the cell row; when the number of cells 1 in the cell row is an odd number, the output poles are usually arranged only on one side of the cell row.

[0139] By including at least one model battery cell in the battery row, the output pole arrangement of the battery row can be controlled by adding model batteries without affecting the total power of the same battery row, thereby avoiding the output pole arrangement of the entire assembly component 10 being affected by the number of battery cells 1 in the battery row.

[0140] Optionally, there are multiple rows of battery cells, and the multiple rows of battery cells are arranged in sequence along the second direction, and the multiple battery cells 1 are arranged in a matrix form of multiple rows and columns in the first direction and the second direction. A filling piece is provided between two adjacent rows of battery cells.

[0141] The filling piece can separate adjacent rows of battery cells to improve the safety of a single row of battery cells. On the other hand, when the filling piece is made of elastic material, when the battery cell 1 expands during the charging and discharging process of the battery pack 100, the filling piece can be compressed to reserve expansion space for the battery cell 1, thereby preventing the battery cell 1 from being crushed, which is beneficial to further improve the safety of the battery pack 100.

[0142] Optionally, the battery pack frame 3 includes a plurality of frames 32, and the plurality of frames 32 are sequentially connected to each other. Both ends of the first crossbeam 11 and the second crossbeam 12 are respectively abutted against two frames 32 arranged opposite to each other in the second direction.

[0143] For example, Figure 4 and Figure 5 As shown, the battery pack frame 3 includes four frames 32, two of which are a left frame and a right frame, respectively. The left frame and the right frame are arranged at intervals along the left-right direction, and the left frame is arranged on the left side of the right frame. The left ends of the first beam 11 and the second beam 12 abut against the left frame, and the right ends of the first beam 11 and the second beam 12 abut against the frame.

[0144] As a result, the first cross beam 11 , the second cross beam 12 and the two side frames 32 of the battery pack frame 3 can transfer force to each other, which is beneficial to further improve the structural strength of the battery pack frame 3 , thereby further improving the structural strength of the battery pack 100 .

[0145] Optionally, the outer end of the longitudinal beam 5 abuts against one of the frame frames 32 .

[0146] For example, Figure 4 and Figure 5 As shown, two of the four frames 32 are respectively the front frame and the rear frame, the front frame and the rear frame are arranged at intervals along the front-to-back direction, and the front frame is arranged at the front side of the rear frame. There are four left longitudinal beams 5, of which four longitudinal beams 5 are front longitudinal beams, and the other two longitudinal beams are rear longitudinal beams, the front longitudinal beam and the rear longitudinal beam are arranged at intervals along the front-to-back direction, and the front longitudinal beam is arranged at the front side of the rear longitudinal beam. Among them, the front longitudinal beam has a front end abutting against the front frame, and a rear end abutting against the front cross beam; the rear end of the rear longitudinal beam abuts against the rear frame, and the front end abuts against the rear cross beam.

[0147] As a result, the longitudinal beam 5 and the frame 32 can transfer force to each other, which is beneficial to further improve the structural strength of the battery pack frame 3, thereby further improving the structural strength of the battery pack 100.

[0148] Optionally, a receiving groove 31 is formed between the first cross beam 11 and the frame 32 and between the second cross beam 12 and the frame 32, and the receiving groove 31 is arranged outside the assembly component 10. A plurality of longitudinal beams 5 are installed in each receiving groove 31, and the plurality of longitudinal beams 5 in the same receiving groove 31 are arranged at intervals along the second direction.

[0149] For example, Figure 4 and Figure 5 As shown, the battery pack frame 3 has two accommodating grooves 31 distributed along the front and back, and two longitudinal beams 5 are arranged in each accommodating groove 31. The two longitudinal beams 5 in the same accommodating groove 31 are arranged at intervals along the left-right direction.

[0150] As described above, the longitudinal beam 5 serves to increase the strength of the battery pack frame 3 . By providing a plurality of longitudinal beams 5 in the same accommodating groove 31 , the strength of the battery pack frame 3 is further improved, thereby improving the overall strength of the battery pack 100 .

[0151] Optionally, the battery pack frame 3 includes a bottom plate, the surface of the bottom plate facing the assembly component 10 has a bonding area 33, and the surface of the assembly component 10 facing the bottom plate has a connection area, which is bonded to the bonding area 33. The size of the bonding area 33 in the first direction is larger than the size of the assembly component 10 in the first direction.

[0152] It is understandable that when the assembly component 10 is installed in the battery pack frame 3, there may be a large assembly error in the first direction between the assembly component 10 and the battery pack frame 3. By setting the size of the bonding area 33 in the first direction to be larger than the size of the assembly component 10 in the first direction, even if the assembly error between the assembly component 10 and the battery pack frame 3 in the first direction is large, the assembly component 10 can be in contact with the glue in the bonding area 33, thereby improving the connection reliability between the battery cell 1 and the battery pack frame 3.

[0153] Optionally, the difference between the dimension of the bonding area 33 in the first direction and the dimension of the assembly component 10 in the first direction is greater than or equal to 10 mm.

[0154] For example, the bonding area 33 extends outward by more than 5 mm on each side in the first direction.

[0155] Therefore, when the assembly component 10 can contact the glue in the bonding area 33, the size of the bonding area 33 is avoided to be too large to cause waste of glue, which is beneficial to reduce the assembly cost of the battery pack 100 while improving the connection reliability between the battery cell 1 and the battery pack frame 3.

[0156] Optionally, the ratio of the area of ​​the connection area to the surface area of ​​the assembly component 10 facing the bottom plate is greater than or equal to 0.9. The glue coating track of the glue solution needs to be verified in advance to increase the bonding area between the assembly component 10 and the battery pack frame 3.

[0157] For example, the bottom surface area of ​​the assembly component 10 is 1m 2 , the area of ​​the connection zone of the assembly component 10 is at least 0.9m 2 .

[0158] This is beneficial to further improve the connection reliability between the battery cell 1 and the battery pack frame 3 .

[0159] Alternatively, if Figure 2 and Figure 3 As shown, the first cross beam 11 and the second cross beam 12 both have a matching portion 22. Figure 6 As shown, a guide rail 34 extending along a first direction is provided in the battery pack frame 3. Figure 5 As shown, the mating portion 22 is movably mated with the guide rail 34 along a first direction.

[0160] When the assembly component 10 needs to be moved along the first direction, the cooperation between the mating portion 22 and the guide rail 34 can guide the movement of the assembly component 10 , which is beneficial to further improve the assembly efficiency of the battery pack 100 .

[0161] Alternatively, if Figure 7 As shown, the guide rail 34 has a guide groove 341 extending along a first direction and an opening 342 communicating with the guide groove 341, that is, the guide groove 341 is a T-shaped groove. The fixing member 7 is movably arranged in the guide groove 341 along the first direction, and the fastener 8 enters the guide groove 341 through the opening 342 and is connected to the fixing member 7 in the guide groove 341.

[0162] Therefore, after the first crossbeam 11 and the second crossbeam 12 are connected to the fixing member 7 , the assembly component 10 can still be pushed to slide along the first direction to adjust the position of the assembly component 10 in the first direction.

[0163] Optionally, when the size of the assembly component 10 in the first direction is greater than a preset value, the size of the assembly component 10 in the first direction is adjusted by increasing the clamping force of the clamp 20 .

[0164] As a result, the battery pack frame 3 can be compatible with more assembly components 10 with different energy densities, so that the energy density adjustment range of the battery pack 100 is wider.

[0165] Alternatively, if Fig.12 As shown, at least one of the first cross beam 11 , the second cross beam 12 and the longitudinal beam 5 is connected to the battery pack frame 3 via a fastener 8 .

[0166] In some embodiments, Figure 6 and Figure 7 As shown, a fixing member 7 for connecting with a fastener 8 is disposed in the battery pack frame 3 , and the fixing member 7 can move relative to the battery pack frame 3 .

[0167] For example, Figure 2 and Figure 3 As shown, the first crossbeam 11 and the second crossbeam 12 are both connected to the battery pack frame 3 through the fastener 8. Specifically, the first crossbeam 11 and the second crossbeam 12 are both provided with a crossbeam connection hole 21 for the fastener 8 to pass through, and the fastener 8 passes through the crossbeam connection hole 21 and is connected to the fixing member 7 of the battery pack frame 3. Fig.12 As shown, the fastener 8 can be a bolt, such as Figure 8 As shown, the fixing member 7 may be a nut having a threaded hole 71 .

[0168] It can be understood that when the size of the assembly component 10 in the first direction changes, the positions of the first beam 11 and the second beam 12 in the first direction will also change. By setting the fixing member 7 to be movable along the first direction, the first beam 11 and the second beam 12 in different positions can be connected to the fixing member 7 through the fastener 8.

[0169] Therefore, the connection of the first cross beam 11 , the second cross beam 12 or the longitudinal beam 5 at different positions to the battery pack frame 3 is facilitated, which is beneficial to further improve the assembly efficiency of the battery pack 100 .

[0170] In other embodiments, a plurality of fixing holes 351 for connecting with the fasteners 8 are provided in the battery pack frame 3 .

[0171] For example, Fig.10As shown, the first crossbeam 11 and the second crossbeam 12 are both connected to the battery pack frame 3 through the fastener 8. Specifically, the first crossbeam 11 and the second crossbeam 12 are both provided with a crossbeam connection hole 21 for the fastener 8 to pass through; a thickening member 35 is provided in the battery pack frame 3, and the thickening member 35 is connected to the bottom plate of the battery pack frame 3, and the thickening member 35 has a plurality of fixing holes 351 arranged at intervals along the first direction. Therefore, when the assembly component 10 is located at different positions of the battery pack frame 3 in the first direction, the fastener 8 can be passed through the crossbeam connection hole 21 and connected to different fixing holes 351, which is conducive to further improving the assembly efficiency of the battery pack 100.

[0172] In other embodiments, the above-mentioned multiple fixing holes 351 can also be changed into waist-shaped holes, which can also connect the first crossbeam 11, the second crossbeam 12 or the longitudinal beam 5 at different positions to the battery pack frame 3.

[0173] Alternatively, if Figure 4 and Figure 5 As shown, the longitudinal beam 5 is provided with a longitudinal beam connecting hole 51 , and the longitudinal beam 5 is connected to the battery pack frame 3 via a connector passing through the longitudinal beam connecting hole 51 .

[0174] The battery pack 100 of the disclosed embodiment adopts a de-modularized design, using the first crossbeam 11 and the second crossbeam 12 as module structural parts and placing the assembly component 10 in the battery pack frame 3 through the clamp 20, thereby simplifying the internal process structure of the battery pack 100. By setting a longitudinal beam that abuts against the first crossbeam 11 or the second crossbeam 12, the pre-pressure of the battery cell 1 in the initial assembly state is ensured. The structure of this battery pack 100 can be adjusted by the clamp 20, so that the battery pack 100 is compatible with the pre-pressure of different battery cells 1 in the initial assembly state, and the thickness tolerance requirements of the battery cell 1 can be better reduced. Battery packs with the same external dimensions can have different energy densities, and the assembly space of the battery cell 1 can be adjusted by adjusting the length of the longitudinal beam 5.

[0175] The vehicle of the disclosed embodiment includes the battery pack 100 described in any of the above embodiments.

[0176] Although the embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present disclosure. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present disclosure.

Claims

1. A method for assembling a battery pack, characterized in that: The following steps are involved: Stacking a first crossbeam, a second crossbeam, and a plurality of battery cells in a preset position to form an assembly component, wherein the plurality of battery cells are located between the first crossbeam and the second crossbeam in a first direction, and the first crossbeam and the second crossbeam both extend along a second direction, and the second direction is perpendicular to the first direction; Clamping the assembly component along the first direction with a clamp, and installing the assembly component into a battery pack frame, and installing a longitudinal beam into the battery pack frame, wherein the longitudinal beam is arranged outside the assembly component and extends along the first direction, and the inner end of the longitudinal beam abuts against the first cross beam or the second cross beam; The clamp is taken out from the battery pack frame, and the battery pack cover is connected to the battery pack frame.

2. The method for assembling a battery pack according to claim 1, characterized in that: Stacking the first crossbeam, the second crossbeam and the plurality of cells in a preset position to form an assembly component includes: First, a first heat insulating member is fixed on the surface of the first crossbeam, and then the first crossbeam, the second crossbeam and the plurality of battery cells are stacked and arranged according to a preset position, wherein the first heat insulating member is located between the first crossbeam and the battery cells; and / or First, a second thermal insulation member is fixed on the surface of the second beam, and then the first beam, the second beam and the plurality of battery cells are stacked and arranged according to a preset position, wherein the second thermal insulation member is located between the second beam and the battery cells.

3. The method for assembling a battery pack according to claim 1, characterized in that: Stacking the first crossbeam, the second crossbeam and the plurality of cells in a preset position to form an assembly component includes: The plurality of battery cells and the plurality of elastic members are alternately stacked in sequence along the first direction to form at least one battery cell row, so that an elastic member is arranged between any two adjacent battery cells in the same battery cell row.

4. The method for assembling a battery pack according to claim 3, characterized in that: Stacking the first crossbeam, the second crossbeam and the plurality of cells in a preset position to form an assembly component includes: First, a plurality of the battery cells and a plurality of the elastic members are alternately stacked in sequence along the first direction to form a battery cell row; Then, placing a filler on one side of the one battery cell row in the second direction; Afterwards, on the side of the filling member away from the one battery cell row, the plurality of battery cells and the plurality of elastic members are alternately stacked in sequence along the first direction to form another battery cell row, so that the assembly component includes the plurality of battery cell rows arranged in sequence along the second direction, and the plurality of battery cells are arranged in a matrix form of multiple rows and columns in the first direction and the second direction.

5. The method for assembling a battery pack according to claim 3, characterized in that: The battery pack assembly method further includes: When the size of the assembly component in the first direction is greater than a preset value, the size of the assembly component in the first direction is adjusted by increasing the clamping force of the clamp so that the inner end of the longitudinal beam abuts against the first cross beam or the second cross beam.

6. The method for assembling a battery pack according to claim 1, characterized in that: Clamping the assembly component along the first direction using a clamp and inserting the assembly component into the battery pack frame includes: First, glue is applied to the battery pack frame to form a bonding area; Then, the assembly component is installed into the battery pack frame corresponding to the bonding area, so that the assembly component is bonded to the battery pack frame.

7. The method for assembling a battery pack according to claim 6, characterized in that: Stacking the first crossbeam, the second crossbeam and the plurality of cells in a preset position to form an assembly component includes: An assembly platform is provided, and the first crossbeam, the second crossbeam and the plurality of battery cells are placed on the assembly platform and stacked according to preset positions to form the assembly component, so that the bottom surfaces of the plurality of battery cells are flush.

8. The method for assembling a battery pack according to any one of claims 1 to 7, characterized in that: The battery pack assembly method further includes: After the assembly component is installed in the battery pack frame, the two ends of the first crossbeam respectively abut against two frames of the battery pack frame arranged opposite to each other in the second direction, and the two ends of the second crossbeam respectively abut against two frames of the battery pack frame arranged opposite to each other in the second direction; and / or, After the longitudinal beam is installed in the battery pack frame, the outer end of the longitudinal beam abuts against one of the frames of the battery pack frame.

9. The method for assembling a battery pack according to any one of claims 1 to 7, characterized in that: The battery pack assembly method further includes: Before removing the clamp from the battery pack frame, connecting the first crossbeam and the second crossbeam to the battery pack frame; and / or Before taking the clamp out of the battery pack frame, the longitudinal beam is connected to the battery pack frame.

10. The method for assembling a battery pack according to any one of claims 1 to 7, characterized in that: The assembly component is first installed in the battery pack frame, and then the assembly component is moved along the first direction to adjust the position of the assembly component in the first direction, and then the longitudinal beam is installed in the battery pack frame.

11. A battery pack, characterized in that: Assembled using the battery pack assembly method described in any one of claims 1 to 10.

12. The battery pack according to claim 11, characterized in that: A plurality of the battery cells are stacked in a preset position to form at least one battery cell row, wherein each battery cell row includes a plurality of the battery cells stacked in sequence along the first direction; An elastic member is provided between at least two of the battery cells in the same battery cell row, and / or At least one of the cells in the same cell row is a model cell.

13. The battery pack according to claim 11 or 12, characterized in that: The battery pack frame comprises a bottom plate, a surface of the bottom plate facing the assembly component has a bonding area, and a surface of the assembly component facing the bottom plate has a connecting area, and the connecting area is bonded to the bonding area; The size of the bonding area in the first direction is greater than the size of the assembly component in the first direction, and / or The ratio of the area of ​​the connection region to the surface area of ​​the assembly component facing the base plate is greater than or equal to 0.

9.

14. The battery pack according to claim 11 or 12, characterized in that: The battery pack frame includes a plurality of frames, and the plurality of frames are sequentially connected at the ends; Two ends of the first crossbeam and the second crossbeam are respectively in contact with two frames arranged opposite to each other in the second direction, and / or The outer end of the longitudinal beam abuts against one of the frame frames.

15. The battery pack according to claim 11 or 12, characterized in that: At least one of the first cross beam, the second cross beam and the longitudinal beam is connected to the battery pack frame through a fastener; The battery pack frame is provided with a fixing piece for connecting with the fastener, and the fixing piece can move relative to the battery pack frame, and / or The battery pack frame is provided with a plurality of fixing holes for connecting with the fasteners.

16. The battery pack according to claim 11 or 12, characterized in that: The battery pack frame includes a plurality of frames, and the plurality of frames are sequentially connected at the ends; A receiving groove is formed between the first cross beam and the frame, and between the second cross beam and the frame, and the receiving groove is arranged on the outside of the assembly component. A plurality of longitudinal beams are installed in each receiving groove, and the plurality of longitudinal beams in the same receiving groove are arranged at intervals along the second direction.

17. A vehicle, characterized in that: A battery pack comprising any one of claims 11-16.

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