A battery pack

Abstract

The utility model belongs to power battery technical field, specifically discloses a kind of battery pack, including battery pack fixed beam, module support, first battery module, second battery module, high voltage device module and BMS board;The battery pack fixed beam includes left crossbeam, right crossbeam, upper longitudinal beam, lower longitudinal beam and fixed plate;First battery module and second battery module correspond to one module support respectively, and module support includes support main body, and multiple subsided pole lug supports are equipped in the length direction of support main body, and two groups of pole lug mounting components are arranged side by side in the width direction in pole lug support;Each group of the pole lug mounting component includes n group of pole lug holes and 2n group of transition strips, and the two groups of transition strips between the two adjacent groups of pole lug holes form the accommodating cavity for installing battery connecting piece.Effectively reduce whole package heat transfer by being arranged in different area to realize the electric connection of two battery modules and high voltage module, separates battery module and high voltage module.

Description

Technical Field

[0001] This utility model belongs to the field of power battery technology, and in particular relates to a battery pack. Background Technology

[0002] With the development of various technologies and applications in the new energy field, as well as the changes in the current international situation, lithium-ion batteries have been widely used in energy storage, consumer electronics and new energy vehicles due to their advantages such as light weight, high energy density, good safety performance, long cycle life and large battery capacity. With the gradual deepening of the national electrification policy, lithium-ion batteries have begun to be applied to electric two-wheelers and motorcycles.

[0003] Currently, the lithium battery packs used in electric motorcycles on the market are mainly below 72V, with relatively low power requirements. Multiple cells are connected in series to form a battery module, which meets the voltage and power requirements of motorcycle battery packs. The battery pack's shape is also relatively regular, a standard cuboid structure, and the battery pack is integrated into the electric motorcycle in a relatively regular manner. As the market demands higher performance, charging time, and range for electric motorcycles, higher requirements are being placed on the energy density and charge / discharge rate performance of battery packs used in electric motorcycles. High-voltage lithium battery packs such as 84V and 96V are gradually emerging, with power capacities between or even higher than (5-6) kWh. These battery packs typically require two battery modules connected in series and parallel. The increased size of the battery pack inevitably increases the number of battery pack components, making it impossible to meet the lightweight requirements of electric motorcycles. It also increases the difficulty of fixing the battery pack as a whole and to the vehicle. The increased power and rate performance of the battery pack further places higher demands on its thermal management. Utility Model Content

[0004] The purpose of this utility model is to provide a battery pack that enables electrical connection between two battery modules and a high-voltage module, and separates the battery modules and the high-voltage module in different areas to effectively reduce heat transfer of the entire pack.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: a battery pack, including a battery pack fixing beam, a module bracket, a first battery module, a second battery module, a high-voltage device module, and a BMS board;

[0006] The battery pack fixing beam includes a left crossbeam, a right crossbeam, an upper longitudinal beam, a lower longitudinal beam, and a fixing plate. The left crossbeam and the upper longitudinal beam are vertically fixed to form an area for installing a first battery module. The upper longitudinal beam and the right crossbeam are vertically fixed to form an area for installing a high-voltage device module. The right crossbeam and the lower longitudinal beam are vertically fixed to form an area for installing a second battery module. The fixing plate is L-shaped. The left side of the horizontal side of the fixing plate is connected to the right side of the upper longitudinal beam, and the lower side of the vertical side of the fixing plate is connected to the right crossbeam. The upper longitudinal beam has a first opening, and the right crossbeam has a second opening. The width of the second opening is greater than the width of the fixing plate. A battery module is supported by a left crossbeam and fixed to an upper longitudinal beam. The high-voltage device module is supported by a right crossbeam and fixed to both the upper and right longitudinal beams. The second battery module is fixed to the right crossbeam and the lower longitudinal beam. The fixing plate is used to fix the BMS board of the battery pack. The high-voltage device module includes a high-voltage device box and high-voltage devices, with the high-voltage devices installed inside the high-voltage device box. The lower side of the high-voltage device box has an opening facing the fixing plate, and the fixing plate can be located inside the high-voltage device box. The first opening is used for routing the high-voltage busbar and sampling harness of the first battery module, and a second opening is used to connect to the second battery module.

[0007] The first and second battery modules each correspond to a module bracket. The module bracket includes a bracket body, the edge of which is a plate-frame structure. The plate-frame structure is fixed to the outer casing of the corresponding first or second battery module. Multiple recessed tab brackets are provided along the length of the bracket body, and these tab brackets are used to install small battery modules. The bracket body and the tab brackets are integrally formed. Two sets of tab mounting components are arranged side-by-side along the width of the tab bracket, and these two sets of tab mounting components are respectively used to install the positive and negative tabs. The electrode tabs; each set of electrode tab mounting components includes n sets of electrode tab holes and 2n sets of transition strips; the n sets of electrode tab holes are arranged parallel to each other along the length of the electrode tab bracket and penetrate the electrode tab bracket; each set of electrode tab holes has a transition strip on both sides, the transition strip is arranged parallel to the electrode tab hole, the inner side of the transition strip coincides with the electrode tab hole, the two sides of the transition strip are longer than the electrode tab hole, and the height of the transition strip is the same as the thickness of the battery connecting piece; the two sets of transition strips between two adjacent sets of electrode tab holes form a receiving cavity for installing the battery connecting piece; the battery connecting piece is fixed after the cell electrode tab passes through the electrode tab hole.

[0008] Furthermore, the receiving cavity is provided with first positioning pins on both sides, and the first positioning pins match the positioning holes on the battery connecting piece; the upper side of the first positioning pin is provided with a connecting thread section, and the nut is fixed in the receiving cavity by threaded connection with the connecting thread section; the tab bracket is provided with fixing posts on both sides in the length direction, and the fixing posts are provided with first connecting holes, and the first connecting piece is fixed to the battery busbar through the first connecting holes.

[0009] Furthermore, the width of the tab hole is 2 to 3 times the thickness of the battery cell tab, and the length of the tab hole is 1.1 to 1.3 times the width of the battery cell tab.

[0010] Furthermore, an upper suspension beam is provided on the upper side of the upper longitudinal beam, a right suspension beam is provided on the right side of the right crossbeam, and a lower suspension beam is provided on the lower side of the lower longitudinal beam. The upper suspension beam, right suspension beam, and lower suspension beam are respectively used for suspension and fixation with the vehicle frame. Suspension through holes are provided in the upper suspension beam, right suspension beam, and lower suspension beam. The upper longitudinal beam, right crossbeam, and lower longitudinal beam are respectively arranged perpendicular to the upper suspension beam, right suspension beam, and lower suspension beam.

[0011] Furthermore, the thicknesses of the upper suspension beam, right suspension beam, and lower suspension beam are three times the thicknesses of the upper longitudinal beam, right transverse beam, and lower longitudinal beam, respectively.

[0012] Furthermore, the fixing plate is 10-15mm higher than the right crossbeam.

[0013] Furthermore, reinforcing ribs connect the left crossbeam, upper longitudinal beam, right crossbeam, and lower longitudinal beam.

[0014] Furthermore, a left suspension beam is provided at the position of the reinforcing rib between the left crossbeam and the lower longitudinal beam. The left suspension beam is used to suspend and fix to the vehicle frame. The left suspension beam is provided with a suspension through hole.

[0015] Furthermore, the fixing plate is provided with a plurality of second positioning pins, the second positioning pins are provided with second connecting holes, and the BMS plate is provided with a third connecting hole opposite to the second connecting hole. The second connector fixes the BMS plate to the fixing plate through the second connecting hole and the third connecting hole.

[0016] Furthermore, the upper longitudinal beam has several fourth connecting holes on its upper and both sides, and several fifth connecting holes on its lower side; the high-voltage device box has several sixth connecting holes on its upper and both sides near the upper longitudinal beam, which are directly opposite the fourth connecting holes, and the third connector connects the upper longitudinal beam and the high-voltage device box through the fourth and sixth connecting holes; the first battery module has several seventh connecting holes on its lower side near the upper longitudinal beam, which are directly opposite the fifth connecting holes, and the fourth connector connects the upper longitudinal beam and the first battery module through the fifth and seventh connecting holes; the right crossbeam has eighth connecting holes around its perimeter. The lower side of the high-voltage device box has a ninth connection hole that is directly opposite the eighth connection hole. The upper side of the second battery module has a tenth connection hole that is directly opposite the eighth connection hole. The fifth connector connects the right crossbeam to the high-voltage device box through the eighth and ninth connection holes. The sixth connector connects the right crossbeam to the second battery module through the eighth and tenth connection holes. The lower side of the lower longitudinal beam has an eleventh connection hole. The side of the second battery module near the lower longitudinal beam has a twelfth connection hole that is directly opposite the eleventh connection hole. The seventh connector connects the second battery module to the lower longitudinal beam through the eleventh and twelfth connection holes.

[0017] The beneficial effects of this technical solution are as follows:

[0018] ① The battery pack fixing beam in this solution serves as the main support, fixing the first battery module, the second battery module, and the high-voltage device module of the battery pack in three areas respectively, separating the high-voltage system of the battery pack from the battery modules, increasing the overall insulation and electrical safety of the battery pack, and effectively reducing the heat transfer of the entire pack.

[0019] ② This technical solution uses a left suspension beam, an upper suspension beam, a right suspension beam, and a lower suspension beam to fix the battery pack to the vehicle as a whole, increasing the mechanical strength and structural stability of the battery pack, while also improving the space utilization of the battery pack in the vehicle.

[0020] ③ This technical solution sets a first opening and a second opening to realize the connection between the first battery module and the second battery module. After the sampling harness of the first battery module and the second battery module passes through the first opening and the second opening, it is connected to the BMS board on the fixed plate, which can shorten the length of the sampling harness and improve the sampling accuracy of the battery pack.

[0021] ④ This technical solution can reduce the overall weight of the battery pack (by setting the first and second openings) while realizing the electrical connection between the battery module and the high-voltage system, thereby improving the overall lightweighting of the battery pack and enhancing its overall strength and space utilization.

[0022] ⑤ The tab brackets separate the electrical connections of multiple small battery modules from the main body of the battery cell assembly, improving the overall insulation and electrical safety of the battery pack. Multiple tab brackets are integrally molded, fixing the outer frame structure of the bracket body to the outer casing of the battery module, increasing the overall structural strength of the battery pack, reducing the number of battery pack components, and lowering the difficulty of fixing the battery modules.

[0023] ⑥ Transition strips are provided on both sides of the tab hole. Positioning pins are provided on both sides of the length direction of the two tab transition strips between adjacent tab holes for positioning and fixing the battery connecting piece. Fixing posts are provided on both sides of the length direction of the tab bracket for fixing the battery busbar, preventing the battery connecting piece or battery busbar from moving and rotating, which would cause the battery pack to fail, and improving the overall electrical safety and structural strength of the battery pack.

[0024] ⑦ The width of the tab hole is 2 to 3 times the thickness of the battery cell tab, and the length is 1.1 to 1.3 times the width of the battery cell tab. This helps to improve the assembly efficiency of the battery cell tab and effectively avoid damage to the battery cell tab.

[0025] ⑧ After the battery cell tabs pass through the tab holes, they are fixed on the battery connecting pieces inside the housing cavity. This prevents the battery cell tabs from being scratched on both sides of the battery connecting pieces, which could cause the battery pack to fail. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a battery pack according to the present invention;

[0027] Figure 2 for Figure 1 Exploded view;

[0028] Figure 3 for Figure 1 A schematic diagram of the structure without the high-voltage component box;

[0029] Figure 4 for Figure 3 A schematic diagram of the structure without high-voltage components;

[0030] Figure 5 for Figure 4 A structural diagram with the BMS board and battery pack fixing beam removed.

[0031] Figure 6 Figure 2 Schematic diagram of the structure of the battery pack fixing beam;

[0032] Figure 7 for Figure 6 The main view;

[0033] Figure 8 for Figure 6 Side view;

[0034] Figure 9 for Figure 2 Schematic diagram of the middle module support structure;

[0035] Figure 10 for Figure 9 The main view;

[0036] Figure 11 for Figure 9 Top view;

[0037] Figure 12 for Figure 9 A bottom view;

[0038] Figure 13 for Figure 11 A sectional view;

[0039] Figure 14 This is a schematic diagram showing the installation of the module bracket and the outer casing of the first battery module.

[0040] Figure 15 for Figure 14 Top view;

[0041] Figure 16 for Figure 15 A magnified view of a portion of the image. Detailed Implementation

[0042] The following detailed description illustrates the specific implementation method:

[0043] The reference numerals in the accompanying drawings include: 1. Battery pack fixing beam; 2. Module bracket; 3. First battery module; 4. Second battery module; 5. High-voltage device module; 6. BMS board; 7. Left crossbeam; 8. Right crossbeam; 9. Upper longitudinal beam; 10. Lower longitudinal beam; 11. Reinforcing rib; 12. Fixing plate; 13. First opening; 14. Second opening; 15. Second positioning pin; 16. Third connecting hole; 17. High-voltage device box; 18. High-voltage device; 19. Second connector; 20. Fourth connecting hole; 21. Fifth connecting hole; 22. Sixth connecting hole; 23. Third connector; 24. Fourth connector. Component 24, Eighth connecting hole 25, Ninth connecting hole 26, Tenth connecting hole 27, Sixth connecting component 28, Eleventh connecting hole 29, Seventh connecting component 30, Upper suspension beam 31, Right suspension beam 32, Lower suspension beam 33, Left suspension beam 34, Suspension through hole 35, Bracket body 36, Thirteenth connecting hole 37, Fifth connecting component 38, Electrode bracket 39, Electrode hole 40, Transition strip 41, Receiving cavity 42, Battery connecting piece 43, Cell electrode 44, First positioning pin 45, Fixing post 46, First connecting hole 47, Battery busbar 48.

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0045] The basic implementation examples are as follows: Figure 1-16 As shown: A battery pack, such as Figure 1-5 As shown, it includes a battery pack fixing beam 1, a module bracket 2, a first battery module 3, a second battery module 4, a high-voltage device module 5, and a BMS board 6.

[0046] like Figure 6-8 As shown, the battery pack fixing beam 1 includes a left crossbeam 7, a right crossbeam 8, an upper longitudinal beam 9, a lower longitudinal beam 10, reinforcing ribs 11, and a fixing plate 12. The reinforcing ribs 11 include several sets of parallel reinforcing plates. The left crossbeam 7 and the upper longitudinal beam 9 are vertically fixed to the upper side of the reinforcing ribs 11, forming an area for installing the first battery module 3. The upper longitudinal beam 9 and the right crossbeam 8 are vertically arranged to form an area for installing the high-voltage device module 5. The right crossbeam 8 and the lower longitudinal beam 10 are vertically fixed to the right side of the reinforcing ribs 11, forming an area for installing the second battery module 4. The fixing plate 12 is L-shaped. The left side of the horizontal side of the fixing plate 12 is connected to the right side of the upper longitudinal beam 9, and the lower side of the vertical side of the fixing plate 12 is connected to the right crossbeam 8. The fixing plate 12 is 10-15mm higher than the right crossbeam 8 to avoid contact between the fixing plate 12 and the electrical connection devices of the second battery module 4, thereby improving the overall insulation of the battery pack. The upper longitudinal beam 9 has two first openings 13, and the right crossbeam 8 has a second opening 14. The width of the second opening 14 is greater than the width of the fixing plate 12. This separates the high-voltage system of the battery pack from the second battery module 4, while providing wiring space for the input (output) busbar and sampling harness of the first battery module 3. The first battery module 3 is supported by the left crossbeam 7 and fixed to the upper longitudinal beam 9. The high-voltage device module 5 is supported by the right crossbeam 8 and fixed to both the upper longitudinal beam 9 and the right crossbeam 8. The second battery module 4 is fixed to the right crossbeam 8 and the lower longitudinal beam 10.

[0047] The fixing plate 12 is used to fix the BMS board 6 of the battery pack. The fixing plate 12 is provided with a plurality of second positioning pins 15, and the second positioning pins 15 are provided with second connecting holes. The BMS board 6 is provided with a third connecting hole 16 opposite to the second connecting hole. The second connector 19 fixes the BMS board 6 to the fixing plate 12 through the second connecting hole and the third connecting hole 16.

[0048] The high-voltage device module 5 includes a high-voltage device box 17 and a high-voltage device 18, with the high-voltage device 18 installed inside the high-voltage device box 17. The high-voltage device box 17 has an opening on its lower side, which faces the fixing plate 12, allowing the fixing plate 12 to be located inside the high-voltage device box 17. A first opening 13 is used for routing the high-voltage busbar and sampling harness of the first battery module 3, and a second opening 14 connects it to the second battery module 4.

[0049] The upper longitudinal beam 9 has several fourth connecting holes 20 on its upper and both sides, and several fifth connecting holes 21 on its lower side. For example... Figure 2 As shown, the upper and both sides of the right side of the high-voltage device box 17 are provided with several sixth connection holes 22 that are directly opposite to the fourth connection hole 20. The third connector 23 connects the upper longitudinal beam 9 and the high-voltage device box 17 through the fourth connection hole 20 and the sixth connection hole 22. The lower left side of the first battery module 3 is provided with several seventh connection holes that are directly opposite to the fifth connection hole 21. The fourth connector 24 connects the upper longitudinal beam 9 and the first battery module 3 through the fifth connection hole 21 and the seventh connection hole. The right crossbeam 8 is provided with eighth connection holes 25 around its perimeter. The lower side of the high-voltage device box 17 is provided with a ninth connection hole 26 that is directly opposite to the eighth connection hole 25. The upper side of the second battery module 4 is provided with a tenth connection hole 27 that is directly opposite to the eighth connection hole 25. The fifth connector 38 connects the right crossbeam 8 and the high-voltage device box 17 through the eighth connection hole 25 and the ninth connection hole 26. The sixth connector 28 connects the right crossbeam 8 and the second battery module 4 through the eighth connection hole 25 and the tenth connection hole 27. The lower longitudinal beam 10 has an eleventh connecting hole 29 on its lower side. For example... Figure 2 As shown, the right side of the second battery module 4 is provided with a twelfth connection hole that is directly opposite the eleventh connection hole 29. The seventh connector 30 connects the second battery module 4 and the lower longitudinal beam 10 through the eleventh connection hole 29 and the twelfth connection hole.

[0050] like Figure 6 As shown, an upper suspension beam 31 is provided on the upper side of the upper longitudinal beam 9, a right suspension beam 32 is provided on the right side of the right crossbeam 8, and a lower suspension beam 33 is provided on the lower side of the lower longitudinal beam 10. The upper suspension beam 31, right suspension beam 32, and lower suspension beam 33 are used for suspension and fixation to the vehicle frame. The upper longitudinal beam 9, right crossbeam 8, and lower longitudinal beam 10 are respectively perpendicular to the upper suspension beam 31, right suspension beam 32, and lower suspension beam 33. The thickness of the upper suspension beam 31, right suspension beam 32, and lower suspension beam 33 is three times the thickness of the upper longitudinal beam 9, right crossbeam 8, and lower longitudinal beam 10, respectively. A left suspension beam 34 is provided at the position of the reinforcing rib 11 between the left crossbeam 7 and the lower longitudinal beam 10. The left suspension beam 34 is used for suspension and fixation to the vehicle frame. Suspension through holes 35 are provided in the left suspension beam 34, upper suspension beam 31, right suspension beam 32, and lower suspension beam 33.

[0051] The first battery module 3 and the second battery module 4 each correspond to a module bracket 2, such as Figure 9-16 As shown, taking the module bracket 2 corresponding to the second battery module 4 as an example, the module bracket 2 includes a bracket body 36, the edge of which is a plate frame structure. The plate frame structure is fixed to the outer casing of the corresponding first battery module 3 or the outer casing of the second battery module 4. A thirteenth connecting hole 37 is provided around the plate frame structure, and the thirteenth connecting holes 37 are equidistantly arranged, corresponding to the eighth connecting hole 25. The sixth connecting member 28 fixes the bracket body 36, the module bracket 2, the outer casing of the first battery module 3, and the outer casing of the second battery module 4 through the thirteenth connecting hole 37, the eighth connecting hole 25, and the tenth connecting hole 27. The thirteenth connecting hole 37 is a screw hole, and the sixth connecting member 28 uses screws. The screw connection further strengthens the fixation to the outer casing of the battery module, increasing the overall structural strength of the battery pack. The outer periphery of the plate frame structure is flush with the outer periphery of the outer casing of the first battery module 3 and the outer casing of the second battery module 4.

[0052] The support body 36 has multiple recessed tab supports 39 along its length (in this embodiment, the module support 2 corresponding to the first battery module 3 has two tab supports 39, and the module support 2 corresponding to the second battery module 4 has three tab supports 39). The tab supports 39 are used to install small battery modules. The support body 36 and the tab supports 39 are integrally formed. The bottom of the tab support 39 is a flat structure, which increases the contact area with the upper surface of the battery cell of the small battery module, and can further increase the overall fixing strength of the battery pack. A groove is left between two adjacent tab supports 39, which is used to leave space for the partition inside the outer casing of the battery module. The tab supports 39 are all inclined inward at 5° to 10° on all sides, forming a structure that is larger at the top and smaller at the bottom. The thickness of the plate frame of the support body 36 and the thickness of the tab supports 39 are equal, which helps to reduce the overall weight of the support and improve the energy density of the battery pack.

[0053] Each tab bracket 39 has two sets of tab mounting assemblies arranged side-by-side along its width, used for mounting the positive and negative tabs respectively. Each set of tab mounting assemblies includes n sets of tab holes 40 and 2n sets of transition strips 41. The n sets of tab holes 40 are arranged parallel to and penetrate the tab bracket 39 along its length. The width of the tab hole 40 is 2 to 3 times the thickness of the cell tab 44, and the length of the tab hole 40 is 1.1 to 1.3 times the width of the cell tab 44. Each set of tab holes 40 has a transition strip 41 on both sides, which is parallel to the tab hole 40. The inner side of the transition strip 41 coincides with the tab hole 40 (i.e., their inner sides are flush), and the two sides of the transition strip 41 are longer than the tab hole 40, with each side being 2 to 3 mm longer than the tab hole 40. The height of the transition strip 41 is the same as the thickness of the battery connecting piece 43. Two sets of transition strips 41 between two adjacent sets of tab holes 40 form a receiving cavity 42 for installing battery connecting piece 43; after the cell tab 44 passes through the tab hole 40, the battery connecting piece 43 is welded and fixed.

[0054] The receiving cavity 42 has first positioning pins 45 on both sides, which match the positioning holes on the battery connecting piece 43; the upper side of the first positioning pin 45 has a connecting thread section, and the nut fixes the battery connecting piece 43 into the receiving cavity 42 by threaded connection with the connecting thread section. The tab bracket 39 has fixing posts 46 on both sides in the length direction, and the fixing posts 46 have first connecting holes 47. The first connector fixes the battery busbar 48 through the first connecting holes 47.

[0055] The first connector, the second connector 19, the third connector 23, the fourth connector 24, the fifth connector 38, the sixth connector 28, and the seventh connector 30 are all made of screws, and each connecting hole is a screw hole that matches the screw.

[0056] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0057] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A battery pack, characterized in that: It includes a battery pack fixing beam (1), a module bracket (2), a first battery module (3), a second battery module (4), a high-voltage device module (5), and a BMS board (6); The battery pack fixing beam (1) includes a left crossbeam (7), a right crossbeam (8), an upper longitudinal beam (9), a lower longitudinal beam (10), and a fixing plate (12). The left crossbeam (7) and the upper longitudinal beam (9) are vertically fixed to form an area for installing the first battery module (3). The upper longitudinal beam (9) and the right crossbeam (8) are vertically fixed to form an area for installing the high-voltage device module (5). The right crossbeam (8) and the lower longitudinal beam (10) are vertically fixed to form an area for installing the second battery module (4). The fixing plate (12) is L-shaped. The left side of the horizontal side of the fixing plate (12) is connected to the right side of the upper longitudinal beam (9), and the lower side of the vertical side of the fixing plate (12) is connected to the right crossbeam (8). The upper longitudinal beam (9) has a first opening (13), and the right crossbeam (8) has a second opening (14). The width of the second opening (14) is greater than the width of the fixing plate (12). A battery module (3) is supported by a left crossbeam (7) and fixed to an upper longitudinal beam (9). The high-voltage device module (5) is supported by a right crossbeam (8) and fixed to the upper longitudinal beam (9) and the right crossbeam (8). The second battery module (4) is fixed to the right crossbeam (8) and the lower longitudinal beam (10). The fixing plate (12) is used to fix the BMS board (6) of the battery pack. The high-voltage device module (5) includes a high-voltage device box (17) and a high-voltage device (18). The high-voltage device (18) is installed in the high-voltage device box (17). The high-voltage device box (17) has an opening on its lower side. The opening is directly opposite the fixing plate (12) and the fixing plate (12) can be located in the high-voltage device box (17). The first opening (13) is used for the routing of the high-voltage busbar and sampling harness of the first battery module (3) and is connected to the second battery module (4) through the second opening (14). The first battery module (3) and the second battery module (4) each correspond to a module bracket (2). The module bracket (2) includes a bracket body (36), the edge of which is a plate frame structure. The plate frame structure is fixed to the outer casing of the corresponding first battery module (3) or the outer casing of the second battery module (4). The bracket body (36) has multiple recessed tab brackets (39) along its length direction. The tab brackets (39) are used to install small battery modules. The bracket body (36) and the tab brackets (39) are integrally formed. Two sets of tab mounting components are arranged side by side along the width direction inside the tab bracket (39). The two sets of tab mounting components are used to install positive and negative tabs respectively. Each set of tab mounting components includes n sets of tabs. Ear holes (40) and 2n sets of transition strips (41); n sets of the ear holes (40) are arranged parallel to the length direction of the ear bracket (39) and pass through the ear bracket (39); each set of the ear holes (40) is provided with transition strips (41) on both sides, the transition strips (41) are arranged parallel to the ear holes (40), the inner side of the transition strips (41) coincides with the ear holes (40), the two sides of the transition strips (41) are longer than the ear holes (40), and the height of the transition strips (41) is the same as the thickness of the battery connecting piece (43); the two sets of transition strips (41) between two adjacent sets of ear holes (40) form a receiving cavity (42) for installing the battery connecting piece (43); the battery connecting piece (43) is fixed after the cell ear (44) passes through the ear hole (40).

2. The battery pack according to claim 1, characterized in that: The receiving cavity (42) is provided with first positioning pins (45) on both sides, and the first positioning pins (45) match the positioning holes on the battery connecting piece (43); the upper side of the first positioning pin (45) is provided with a connecting thread section, and the nut is fixed in the receiving cavity (42) by threaded connection with the connecting thread section; the tab bracket (39) is provided with fixing posts (46) on both sides in the length direction, and the fixing posts (46) are provided with first connecting holes (47), and the first connector is fixed to the battery busbar (48) through the first connecting holes (47).

3. A battery pack according to claim 1, characterized in that: The width of the tab hole (40) is 2 to 3 times the thickness of the battery cell tab (44), and the length of the tab hole (40) is 1.1 to 1.3 times the width of the battery cell tab (44).

4. A battery pack according to claim 1, characterized in that: The upper longitudinal beam (9) is provided with an upper suspension beam (31) on its upper side, the right cross beam (8) is provided with a right suspension beam (32) on its right side, and the lower longitudinal beam (10) is provided with a lower suspension beam (33) on its lower side. The upper suspension beam (31), right suspension beam (32) and lower suspension beam (33) are respectively used for suspension and fixing with the vehicle frame. The upper suspension beam (31), right suspension beam (32) and lower suspension beam (33) are provided with suspension through holes (35). The upper longitudinal beam (9), right cross beam (8) and lower longitudinal beam (10) are respectively perpendicular to the upper suspension beam (31), right suspension beam (32) and lower suspension beam (33).

5. A battery pack according to claim 4, characterized in that: The thicknesses of the upper suspension beam (31), right suspension beam (32) and lower suspension beam (33) are three times the thicknesses of the upper longitudinal beam (9), right transverse beam (8) and lower longitudinal beam (10), respectively.

6. A battery pack according to claim 1, characterized in that: The fixing plate (12) is 10-15mm higher than the right crossbeam (8).

7. A battery pack according to claim 1, characterized in that: The left crossbeam (7), upper longitudinal beam (9), right crossbeam (8) and lower longitudinal beam (10) are connected by reinforcing ribs (11).

8. A battery pack according to claim 7, characterized in that: A left suspension beam (34) is provided at the position of the reinforcing rib (11) between the left crossbeam (7) and the lower longitudinal beam (10). The left suspension beam (34) is used to suspend and fix to the vehicle frame. The left suspension beam (34) is provided with a suspension through hole (35).

9. A battery pack according to claim 1, characterized in that: The fixing plate (12) is provided with a plurality of second positioning pins (15), the second positioning pins (15) are provided with second connecting holes, the BMS plate (6) is provided with a third connecting hole (16) opposite to the second connecting hole, and the second connector (19) fixes the BMS plate (6) on the fixing plate (12) through the second connecting hole and the third connecting hole (16).

10. A battery pack according to claim 9, characterized in that: The upper longitudinal beam (9) has several fourth connecting holes (20) on its upper side and both sides, and several fifth connecting holes (21) on its lower side; the high-voltage device box (17) has several sixth connecting holes (22) on its upper side and both sides near the upper longitudinal beam (9), which are directly opposite to the fourth connecting holes (20); the third connector (23) connects the upper longitudinal beam (9) and the high-voltage device box (17) through the fourth connecting holes (20) and the sixth connecting holes (22); the first battery module (3) has several seventh connecting holes on its lower side near the upper longitudinal beam (9), which are directly opposite to the fifth connecting holes (21); the fourth connector (24) connects the upper longitudinal beam (9) and the first battery module (3) through the fifth connecting holes (21) and the seventh connecting holes; the right crossbeam (8) has eighth connecting holes (25) around its perimeter, and the high-voltage device box (17) has several sixth connecting holes (22) on its upper side and both sides, which are directly opposite to the fourth connecting holes (20); the third connector (23) connects the upper longitudinal beam (9) and the high-voltage device box (17) through the fifth connecting holes (21) and the seventh connecting holes (22); the right crossbeam (8) has eighth connecting holes (25) around its perimeter, and the high-voltage device box (17) has several sixth connecting holes (22) on its upper side and both sides, which are directly opposite to the fourth connecting holes (20); the third connector (23) connects the upper longitudinal beam (9) and the first battery module (3) through the fifth connecting holes (21) and the seventh connecting holes (25); the right crossbeam (8) has eighth connecting holes (25) around its perimeter, and the high-voltage device box (17) has several sixth connecting holes (22) on its upper side and both sides, which are directly opposite to the fourth connecting holes (20) and both sides, which are directly opposite to the fifth connecting holes (21) and both sides, which are directly opposite to the fifth connecting holes (2 The lower side is provided with a ninth connection hole (26) that is directly opposite to the eighth connection hole (25). The upper side of the second battery module (4) is provided with a tenth connection hole (27) that is directly opposite to the eighth connection hole (25). The fifth connector (38) connects the right crossbeam (8) to the high voltage device box (17) through the eighth connection hole (25) and the ninth connection hole (26). The sixth connector (28) connects the right crossbeam (8) to the second battery module (4) through the eighth connection hole (25) and the tenth connection hole (27). The lower longitudinal beam (10) is provided with an eleventh connection hole (29) on its lower side. The side of the second battery module (4) near the lower longitudinal beam (10) is provided with a twelfth connection hole that is directly opposite to the eleventh connection hole (29). The seventh connector (30) connects the second battery module (4) and the lower longitudinal beam (10) through the eleventh connection hole (29) and the twelfth connection hole.

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