Battery pack case, battery pack and electric vehicle

Abstract

The battery pack case (100), battery pack (200), and electric vehicle (300) comprise a battery pack case (100) including a case body (10) and at least one structural beam (20) located within the case body (10) and dividing the interior of the case body (10) into a plurality of storage cavities (30), the case body (10) including a top plate (101) and a bottom plate (102) disposed opposite each other along a first direction that is the height direction of the battery pack case (100), the structural beam (20) being located between the top plate (101) and the bottom plate (102), and the at least one structural beam (20) being joined to the top plate (101) and the bottom plate (102), and the battery pack case (100) is provided with a mounting portion (40) that is fixedly connected to an external support member. The battery pack case (100) has high structural strength, rigidity, and high space utilization rate.

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This disclosure is based on and claims priority to Chinese Patent Application No. 202020637729.0, filed on April 24, 2020, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to the field of batteries, and in particular to a battery pack case, a battery pack, and an electric vehicle. [Background technology]

[0003] A conventional battery pack case generally comprises a tray and an upper cover, and the tray is generally welded to a bottom plate with a number of side beams. In addition, the tray, as a main load-bearing member of the battery pack, generally has a number of horizontal and vertical beams welded therein during manufacture to ensure that it has sufficient strength. However, such a design has many components in the battery pack case, a complex structure, low space utilization, and high manufacturing costs because each component needs to be connected by a process such as welding. In addition, since the battery pack case has a large number of welded parts, if a weld defect occurs at a welded part, it increases the possibility of a poor sealing of the battery pack, which further affects the service life of the battery pack. Summary of the Invention

[0004] A battery pack case according to a first aspect of the present disclosure includes a case body and at least one structural beam located within the case body and dividing an interior of the case body into a plurality of housing cavities; the case body includes a top plate and a bottom plate that are disposed opposite each other along a first direction that is a height direction of the battery pack case, the structural beam is located between the top plate and the bottom plate, and at least one of the structural beams is joined to the top plate and the bottom plate; The battery pack case is provided with a mounting portion that is fixedly connected to an external support member.

[0005] The beneficial effects of the present disclosure are as follows. In the battery pack case of the present disclosure, the structural beam is located between the top plate and the bottom plate and is joined to the top plate and the bottom plate. By installing in this manner, the structural beam, the top plate, and the bottom plate form a structure in the shape of a letter "U". This structure has high strength and rigidity, and can meet the performance requirements of the battery pack case, such as load resistance, impact resistance, and pressure resistance. The battery pack case of the present disclosure has a simple structure, low manufacturing cost, and high space utilization rate. The structural beam divides the case body into a plurality of housing cavities, and when a cell assembly or a single cell in one of the housing cavities experiences thermal runaway, it does not affect the other housing cavities, and thus the safety of the operation of the battery pack can be improved. In addition, when such a battery pack is attached to a vehicle, the structural strength of the battery pack becomes part of the structural strength of the vehicle, and therefore the structural strength of the vehicle can be improved, which helps to realize the design requirement for reducing the weight of the entire electric vehicle and reduces the design and manufacturing costs of the vehicle.

[0006] In some embodiments of the present disclosure, the length of the accommodating cavity along the second direction is greater than 500 mm, and the second direction is the width direction of the battery pack case or the length direction of the battery pack case.

[0007] In some embodiments of the present disclosure, the structural beams are installed in multiple locations and have a length extending along a second direction, the multiple structural beams are distributed at intervals along a third direction, each structural beam is joined to the top plate and the bottom plate, the second direction is the length direction of the battery pack case and the third direction is the width direction of the battery pack case, or the second direction is the width direction of the battery pack case and the third direction is the length direction of the battery pack case.

[0008] In some embodiments of the present disclosure, the case body is integrally molded with the structural beam.

[0009] In some embodiments of the present disclosure, the case body includes a first frame and a second frame distributed on both sides of the case body along a third direction, and the third direction is a width direction of the battery pack case or a length direction of the battery pack case.

[0010] In some embodiments of the present disclosure, at least one of the first frame and the second frame has an internal cavity, and a reinforcing plate is installed within the cavity to divide the cavity into a number of sub-cavities.

[0011] In some embodiments of the present disclosure, the mounting portion is disposed on the first frame and the second frame.

[0012] In some embodiments of the present disclosure, the battery pack case further includes an end plate, a first opening is provided at an end of the case body along a second direction, the end plate seals the first opening, and the second direction is a width direction of the battery pack case or a length direction of the battery pack case.

[0013] In some embodiments of the present disclosure, a first opening is provided at both ends of the case body along the second direction, and the end plate includes a third frame and a fourth frame sealingly connected to the case body to seal the corresponding first opening.

[0014] In some embodiments of the present disclosure, the case body, the third frame and the fourth frame are metal parts and are sealed and connected by welding.

[0015] In some embodiments of the present disclosure, the battery pack case further includes a sealing plate, and a second opening is provided at an end of the accommodating cavity along the second direction, and the sealing plate is located inside the end plate and closes a portion of the second opening adjacent to the bottom plate.

[0016] In some embodiments of the present disclosure, the battery pack case further includes a sealing plate, and a second opening is provided at an end of the accommodating cavity along the second direction, and the sealing plate is located inside the end plate and completely covers the second opening.

[0017] In some embodiments of the present disclosure, at least one of the structural beams has an end along the second direction formed with a recess recessed away from the end plate.

[0018] In some embodiments of the present disclosure, a heat dissipation passage extending along a second direction is provided in at least one of the structural beams, and the second direction is the width direction of the battery pack case or the length direction of the battery pack case.

[0019] In some embodiments of the present disclosure, each of the structural beams includes a first side panel and a second side panel spaced apart along a third direction, the first side panel, the second side panel, the top panel and the bottom panel surround the heat dissipation passage, the second direction is a width direction of the battery pack case and the third direction is a length direction of the battery pack case, or the second direction is a length direction of the battery pack case and the third direction is a width direction of the battery pack case.

[0020] In some embodiments of the present disclosure, the structural beam further includes a partition plate connected to the first side plate and the second side plate, the partition plate dividing the heat dissipation passage into a plurality of sub-passages.

[0021] In some embodiments of the present disclosure, an adhesive injection hole is provided in the battery pack case, and each of the accommodating cavities corresponds to and communicates with at least one of the adhesive injection holes.

[0022] In some embodiments of the present disclosure, the battery pack case is a sealed case, and the air pressure within the receiving cavity is lower than the air pressure outside the battery pack case.

[0023] In some embodiments of the present disclosure, the pressure within the receiving cavity is between -40KPa and -70KPa.

[0024] In some embodiments of the present disclosure, the battery pack case is provided with an exhaust hole. In some embodiments of the present disclosure, the battery pack case is provided with a plurality of exhaust holes that correspond to and communicate with the plurality of accommodating cavities, respectively.

[0025] In some embodiments of the present disclosure, the plurality of accommodating cavities communicate with each other, and the battery pack case is provided with at least one exhaust hole communicating with the accommodating cavities.

[0026] A battery pack according to a second embodiment of the present disclosure includes any one of the battery pack cases described above.

[0027] An electric vehicle according to a third embodiment of the present disclosure includes an external support member and the above-described battery pack fixed to the external support member.

[0028] Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure. [Brief description of the drawings]

[0029] [Figure 1] 1 is a schematic configuration diagram of a battery pack according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is an exploded view of a battery pack case according to an embodiment of the present disclosure. [Diagram 3] FIG. 3 is a partial enlarged view of part A in FIG. [Figure 4] FIG. 3 is a partial enlarged view of part B in FIG. [Diagram 5] 1 is a schematic configuration diagram of an electric vehicle according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] Hereinafter, the embodiments of the present disclosure will be described in detail. Examples of the embodiments to be described are shown in the drawings, and the same or similar reference numerals throughout represent the same or similar parts, or parts having the same or similar functions. The embodiments described below with reference to the drawings are illustrative and are merely for interpreting the present disclosure, and should not be understood as limiting the present disclosure.

[0031] In addition, in the description of the present disclosure, the orientations or positional relationships indicated by the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial direction," "radial direction," "circumferential direction," and the like are based on the orientations or positional relationships shown in the drawings, and are merely intended to easily explain and simplify the description of the present disclosure, and do not indicate or suggest that the devices or parts shown must have a specific orientation and be configured and operated in a specific orientation, and therefore should not be understood as limiting the present disclosure.

[0032] 1 to 3, a battery pack case 200 according to the present disclosure includes a case body 10 and at least one structural beam 20 located within the case body 10 and dividing the interior of the case body 10 into a plurality of housing cavities 30, the case body 10 includes a top plate 101 and a bottom plate 102 that are installed facing each other along a first direction that is the height direction of the battery pack case 200, the structural beam 20 is located between the top plate 101 and the bottom plate 102, and the at least one structural beam 20 is joined to the top plate 101 and the bottom plate 102, and a mounting portion 40 that is fixedly connected to an external support member is installed on the battery pack case 200. The first direction is the Z direction in the drawings.

[0033] In the battery pack case 200 of the present disclosure, the structural beam 20 is located between the top plate 101 and the bottom plate 102 and is joined to the top plate 101 and the bottom plate 102. By installing in this manner, the structural beam 20, the top plate 101, and the bottom plate 102 form a structure shaped like an "U". This structure has high strength and rigidity, and can meet the performance requirements of the battery pack case 200, such as load resistance, impact resistance, and pressure resistance. The battery pack case 200 of the present disclosure has a simple structure, low manufacturing cost, and high space utilization rate. The structural beam 20 divides the case body 10 into a plurality of housing cavities 30. When a cell assembly or a single battery in one housing cavity 30 thermally runs away, the other housing cavities 30 are not affected, and thus the safety of the operation of the battery pack 100 can be improved. Furthermore, when such a battery pack 100 is attached to a vehicle, the structural strength of the battery pack 100 becomes part of the vehicle structural strength, thereby improving the structural strength of the vehicle, helping to achieve the design requirement for reducing the overall weight of an electric vehicle, and reducing the design and manufacturing costs of the vehicle.

[0034] It should be noted that the battery pack case 200 of the present disclosure is a housing for the battery pack 100 and houses the cell assemblies or the cells. The battery pack case 200 is removably or non-removably connected and fixed to an external support member by the mounting portion 40 provided thereon, and is not a housing for the battery modules or the cells. In general, the battery pack 100 further includes at least one of a battery management system (BMS), a battery connector, a battery sampler, and a battery thermal management system.

[0035] The cell assembly includes a sealing film and at least one electrode body sealed in the sealing film. The electrode body is an electrode body commonly used in the field of power batteries, and may be an electrode body formed by winding or an electrode body manufactured in a stacking manner. In general, the electrode body includes at least a positive electrode sheet, a separator and a negative electrode sheet.

[0036] Furthermore, with regard to the structural beam 20 being joined to the top plate 101 and the bottom plate 102, it should be understood that the top plate 101, the bottom plate 102 and the structural beam 20 are integrally formed, or one of the top plate 101 and the bottom plate 102 is integrally formed with the structural beam 20 and the other is welded to the structural beam 20, or the structural beam 20 has one end welded to the bottom plate 102 and the opposite end welded to the top plate 101.

[0037] In one embodiment, as shown in Fig. 2, the length of the receiving cavity 30 along the second direction is greater than 500mm. In some embodiments of the present disclosure, the length of the receiving cavity 30 along the second direction is 500mm to 2500mm. The second direction is different from the first direction, and the second direction is the Y direction in the figure. Due to the dimension design of the receiving cavity 30, the battery pack 100 can meet the requirements of large capacity and high space utilization rate.

[0038] In some embodiments of the present disclosure, the length of the receiving cavity 30 along the second direction is between 1000 mm and 2000 mm.

[0039] In some embodiments of the present disclosure, the length of the receiving cavity 30 along the second direction is between 1300 mm and 2200 mm.

[0040] In this embodiment, the second direction is the width direction of the battery pack case 200 or the length direction of the battery pack case 200 .

[0041] 2-3, in one embodiment, a plurality of structural beams 20 are installed and extend longitudinally along a second direction, the plurality of structural beams 20 are distributed at intervals along a third direction, and each structural beam 20 is joined to a top plate 101 and a bottom plate 102. Here, the first direction, the second direction, and the third direction are different, and the third direction is the X direction in the figures.

[0042] In one embodiment, the case body 10 is integrally formed with the structural beam 20. This arrangement not only simplifies the processing process, but also helps reduce manufacturing costs, and ensures that the case has sufficient structural strength and rigidity, thereby meeting the performance requirements of the case, such as load-bearing, impact resistance, and pressure resistance.

[0043] Specifically, the top plate 101, the bottom plate 102 and the structural beams 20 are integrally formed.

[0044] In one embodiment, the second direction is the length direction of the battery pack case 200 and the third direction is the width direction of the battery pack case 200, or the second direction is the width direction of the battery pack case 200 and the third direction is the length direction of the battery pack case 200.

[0045] As can be seen, each structural beam 20 is joined to the top plate 101 and the bottom plate 102, and each structural beam 20, the top plate 101, and the bottom plate 102 form an "U"-shaped structure, which has high strength and rigidity, and can meet the performance requirements of the battery pack case 200, such as load resistance, impact resistance, and pressure resistance. The battery pack case 200 has a simple structure and high space utilization rate. In addition, the case body 10 and the structural beam 20 are manufactured by integral molding, which simplifies the processing process and helps reduce manufacturing costs. When such a battery pack 100 is installed in a vehicle, the structural strength of the battery pack 100 becomes part of the structural strength of the vehicle, which can improve the structural strength of the vehicle, helps to realize the design requirement for reducing the weight of the entire electric vehicle, and reduces the design and manufacturing costs of the vehicle.

[0046] 2 to 4, the case body 10 includes a first frame 103 and a second frame 104 distributed on both sides of the case body 10 along a third direction, which is the width direction or the length direction of the battery pack case 200. The third direction is the X direction in the drawings.

[0047] In some embodiments, the case body 10 includes a top plate 101 and a bottom plate 102 arranged opposite each other along a first direction, and a first frame 103 and a second frame 104 arranged opposite each other along a third direction, and the top plate 101, the first frame 103, the bottom plate 102 and the second frame 104 are connected.

[0048] As can be seen, the top plate 101, the first frame 103, the bottom plate 102 and the second frame 104 surround an accommodation space, and the structural beam 20 is located within the accommodation space. In some embodiments of the present disclosure, the top plate 101, the first frame 103, the bottom plate 102 and the second frame 104 are integrally molded, and such installation can ensure that the case body 10 has high structural strength, and is easy to process, which helps to reduce manufacturing costs. Of course, in other embodiments, the first frame 103 and the second frame 104 can be connected to the top plate 101 and the bottom plate 102 by an intermediate plate, or the first frame 103 can be welded to the top plate 101 at one end and welded to the bottom plate 102 at the other opposite end. Similarly, the first frame 103 can be welded to the top plate 101 at one end and welded to the bottom plate 102 at the other opposite end.

[0049] In one embodiment of the present disclosure, the top plate 101, the first frame 103, the bottom plate 102, the second frame 104 and the structural beam 20 are integrally molded, for example, extruded with a one-piece aluminum profile. In this way, it is not only possible to ensure that the battery pack case 200 has high structural strength, but also to simplify the manufacturing process and reduce the processing cost. Of course, in other embodiments, the top plate 101, the bottom plate 102 and the structural beam 20 are integrally molded to form an integral member, and then the first frame 103 is welded to the top plate 101 and the bottom plate 102, and the second frame 104 is welded to the top plate 101 and the bottom plate 102.

[0050] In some embodiments, the first direction is a height direction of the battery pack case 200, the second direction is one of a width direction and a length direction of the battery pack case 200, and the third direction is one of a width direction and a length direction of the battery pack case 200. In other words, the second direction is a width direction of the battery pack case 200 and the third direction is a length direction of the battery pack case 200, or the second direction is a length direction of the battery pack case 200 and the third direction is a width direction of the battery pack case 200.

[0051] In an embodiment of the present disclosure, the second direction is the width direction of the battery pack case 200 and is parallel to the width direction of the electric vehicle 300. In an embodiment of the present disclosure, the third direction is the length direction of the battery pack case 200 and is parallel to the length direction of the electric vehicle 300.

[0052] Of course, in other embodiments, the second direction may be parallel to the length of the electric vehicle 300 and the third direction may be parallel to the width of the electric vehicle 300.

[0053] 2 to 4, at least one of the first frame 103 and the second frame 104 has a cavity 111 therein, and a reinforcing plate 105 is provided in the cavity 111 to divide the cavity 111 into a plurality of sub-cavities 106. By providing the reinforcing plate 105 in this manner, it is possible to ensure that the first frame 103 and the second frame 104 have a certain strength, which helps to improve the strength required for the impact resistance and pressure resistance of the battery pack 100.

[0054] 1 and 2, the first frame 103 and the second frame 104 are provided with mounting parts 40 that are fixedly connected to an external support member. Of course, in other embodiments, the mounting parts 40 may be provided on the top plate 101 or the bottom plate 102.

[0055] 1 and 2, the mounting portion 40 is a mounting hole 401 provided in the first frame 103 and the second frame 104. A fastening member (e.g., a bolt or a rivet) passes through the mounting hole 401 to connect and fix the battery pack 100 to an external support member.

[0056] In some embodiments, the mounting holes 401 disposed in the first frame 103 extend through the first frame 103 along a first direction, and the mounting holes 401 disposed in the second frame 104 extend through the second frame 104 along the first direction. However, the mounting holes 401 may be disposed such that their axial directions form an included angle of, for example, 5° or 10° with the first direction.

[0057] In some embodiments of the present disclosure, a plurality of mounting holes 401 are provided, and the mounting holes 401 provided in the first frame 103 are arranged in sequence along the length direction of the first frame 103. Here, the length direction of the first frame 103 is parallel to the second direction.

[0058] Similarly, the mounting holes 401 provided in the second frame 104 are arranged in sequence along the length direction of the second frame 104. Here, the length direction of the second frame 104 is parallel to the second direction.

[0059] Of course, in another embodiment, the mounting portion 40 is an eyebolt attached to the first frame 103 and the second frame 104. The eyebolt is fixedly connected to the external support member so as to fixedly connect the battery pack 100 to the external support member.

[0060] However, in another embodiment, the mounting portion 40 is a mounting block attached to the first frame 103 and the second frame 104, and the mounting block may be fixed to the external support member by welding. Of course, the mounting block may also be fixed to the external support member by adhesion or locking.

[0061] In one embodiment, as shown in FIG. 2 to FIG. 4, the first frame 103 includes a first frame body 1031 and a second frame body 1032, and the second frame 104 includes a third frame body 1041 and a fourth frame body 1042. The first frame body 1031 and the third frame body 1041 are installed facing each other along the second direction, and both are connected to the top plate 101 and the bottom plate 102. The second frame body 1032 is installed on the side of the first frame body 1031 away from the third frame body 1041, and the fourth frame body 1042 is installed on the side of the third frame body 1041 away from the first frame body 1031, and the mounting portion 40 is installed on the second frame body 1032 and the fourth frame body 1042.

[0062] In some embodiments of the present disclosure, the first frame body 1031 and the second frame body 1032 are perpendicular to each other and form an L-shaped structure. This arrangement helps to improve the structural strength of the first frame 103. The third frame body 1041 and the fourth frame body 1042 are perpendicular to each other and form an L-shaped structure. This arrangement helps to improve the structural strength of the second frame 104. However, the first frame body 1031 and the second frame body 1032, and the third frame body 1041 and the fourth frame body 1042 may be arranged at an included angle of, for example, 70° or 80°.

[0063] In one embodiment, as shown in the figure, the battery pack case 200 further includes an end plate 112, and a first opening 113 is provided at an end of the case body 10 along the second direction, the end plate 112 seals the first opening 113, and the second direction is the width direction of the battery pack case 200 or the length direction of the battery pack case 200.

[0064] As can be understood, the cell assembly or the single battery may be mounted in the accommodating cavity 30 through the first opening 113, and such a mounting method is easy to operate, and the electrodes of the cell assembly or the single battery in the accommodating cavity 30 may be pulled out from the first opening 113, and at the same time, it can ensure that the battery pack case 200 has high structural strength.

[0065] In some embodiments of the present disclosure, a first opening 113 is provided at both ends of the case body 10 along the second direction, and the end plate 112 includes a third frame 107 and a fourth frame 108 that are sealingly connected to the case body 10 to seal the corresponding first opening 113.

[0066] As can be understood, when a first opening 113 is provided at both ends of the case body 10 along the second direction, the electrodes of the cell assembly or single battery located in the accommodating cavity 30 may be pulled out from the first opening 113, respectively.

[0067] In some embodiments of the present disclosure, the case body 10, the third frame 107 and the fourth frame 108 are metal parts and are sealed and connected by welding.

[0068] However, in other embodiments, the case body 10, the third frame 107, and the fourth frame 108 may be made of plastic. The third frame 107 and the fourth frame 108 may be sealingly connected to the case body 10 by adhesive, locking, or other methods.

[0069] 2 to 4, in some embodiments of the present disclosure, the third frame 107 and the fourth frame 108 have a hollow structure, and reinforcing plates 105 are installed in the third frame 107 and the fourth frame 108 to divide the internal spaces of the third frame 107 and the fourth frame 108 into a plurality of sub-cavities 106. By installing them in this manner, it is possible to ensure that the third frame 107 and the fourth frame 108 have a certain strength, which helps to improve the strength required for the impact resistance and pressure resistance of the battery pack case 200.

[0070] In one embodiment, the battery pack case 200 further includes a sealing plate, and a second opening is provided at an end of the accommodating cavity 30 along the second direction, and the sealing plate is located inside the end plate 112 and connected to the structural beam 20 and the case body 10 to close a portion of the second opening of the accommodating cavity 30 adjacent to the bottom plate 102. That is, the sealing plate realizes semi-closure of the second opening of the accommodating cavity 30. In this way, when an electrode assembly group sealed with a sealing film is accommodated in the accommodating cavity 30, it is possible to prevent the electrolyte from flowing from one accommodating cavity 30 to another accommodating cavity 30 due to unexpected rupture of the sealing film, thereby preventing an internal short circuit, and further improving the safety of the use of the battery pack 100.

[0071] The semi-closure of the second opening of the storage cavity 30 located at both ends among the multiple storage cavities 30 may be achieved by connecting a sealing plate to the first frame 103, the bottom plate 102 and the structural beam 20, or by connecting a sealing plate to the second frame 104, the bottom plate 102 and the structural beam 20, thereby closing the portion of the second opening of the storage cavity 30 adjacent to the bottom plate 102.

[0072] The semi-closure of the second opening of the remaining storage cavity 30 among the multiple storage cavities 30 may be achieved by connecting a sealing plate to the bottom plate 102 and two adjacent structural beams 20 to close the portion of the second opening of the storage cavity 30 adjacent to the bottom plate 102.

[0073] In one embodiment, as shown in the figure, the battery pack case 200 further includes a sealing plate, and a second opening is provided at an end of the accommodating cavity 30 along the second direction, and the sealing plate is located inside the end plate 112 and connected to the structural beam 20 and the case body 10 to completely close the second opening of the accommodating cavity 30. That is, the complete closing of the second opening of the accommodating cavity 30 by the sealing plate further improves the safety of use of the battery pack 100.

[0074] The complete blocking of the second openings of the storage cavities 30 located at both ends among the multiple storage cavities 30 may be achieved by connecting a sealing plate to the first frame 103, the structural beam 20, the top plate 101 and the bottom plate 102, or by connecting a sealing plate to the second frame 104, the structural beam 20, the top plate 101 and the bottom plate 102, thereby completely blocking the second openings of the storage cavities 30.

[0075] The complete blocking of the second opening of the remaining storage cavities 30 among the multiple storage cavities 30 may be achieved by connecting a sealing plate to the bottom plate 102, the top plate 101 and two adjacent structural beams 20, thereby completely blocking the second opening of the storage cavity 30.

[0076] In one embodiment, as shown in FIGS. 1 and 2, at least one structural beam 20 has an end along the second direction formed with a recess 201 recessed away from the end plate 112 .

[0077] The structural design of the recess 201 can accommodate an insulating protective frame, an electrical connection sheet, etc., and using such a structural design helps to reduce the size of the battery pack case 200 without increasing the length of the battery pack case 200 along the second direction.

[0078] In some embodiments of the present disclosure, a recess 201 is formed on both ends of each structural beam 20 along the second direction, and the recess 201 located adjacent to the third frame 107 is spaced away from the third frame 107, and the recess 201 located adjacent to the fourth frame 108 is spaced away from the fourth frame 108.

[0079] 2 to 4, a heat dissipation passage 202 extending along a second direction is provided in at least one structural beam 20, and the second direction is the width direction or the length direction of the battery pack case 200. In this way, heat generated in the cell assembly or the single battery accommodated in the accommodation cavity 30 can enter the heat dissipation passage 202 and then be transferred to the outside of the battery pack case 200 through the top plate 101 and the bottom plate 102. Compared with the structural beam 20 using a solid structural design, such a structural design of the present disclosure increases the heat dissipation space in the battery pack case 200, which helps to improve the effect of cooling and heat dissipation.

[0080] In one embodiment, as shown in Figures 2 to 4, each structural beam 20 includes a first side panel 203 and a second side panel 204 spaced apart along a third direction, and a heat dissipation passage 202 is surrounded by the first side panel 203, the second side panel 204, the top panel 101 and the bottom panel 102, and the second direction is the width direction of the battery pack case 200 and the third direction is the length direction of the battery pack case 200, or the second direction is the length direction of the battery pack case 200 and the third direction is the width direction of the battery pack case 200.

[0081] That is, the space surrounded by first side plate 203, second side plate 204, top plate 101, and bottom plate 102 is heat dissipation passage 202. In this way, heat dissipation passage 202 can be formed by the structure of case body 10 and structural beam 20 themselves, and there is no need to add a heat dissipation pipe, which helps to simplify the structural design of battery pack 100 and reduce manufacturing costs.

[0082] 2 to 4, the structural beam 20 further includes a partition plate 205 connected to the first side plate 203 and the second side plate 204, which divides the heat dissipation passage 202 into a plurality of sub-passages. This arrangement allows the battery pack case 200 to have a high cooling and heat dissipation effect, and ensures that the structural beam 20 has a certain strength, which helps to improve the overall strength of the battery pack 100.

[0083] 1 and 2 , an adhesive injection hole 109 is provided in the battery pack case 200, and each of the receiving cavities 30 communicates with at least one adhesive injection hole 109. As can be understood, the adhesive injection hole 109 allows a structural adhesive to be injected into the battery pack case 200 to fixedly connect the cell assemblies or cells received in the receiving cavities 30 to the battery pack case 200, thereby improving the structural strength of the battery pack 100.

[0084] In one embodiment, the battery pack case 200 is a sealed case, and the air pressure in the receiving cavity 30 is lower than the air pressure outside the battery pack case 200. By installing in this manner, the air pressure in the receiving cavity 30 can be made lower than the air pressure outside the battery pack case 200 by a vacuum exhaust operation, thus reducing the amount of substances such as water vapor in the battery pack case 200, and preventing the deterioration and damage of components such as cell assemblies and batteries in the battery pack case 200 due to the long-term action of water vapor, thereby extending the service life of the battery pack 100. In addition, the sealed case can achieve the effect of double sealing.

[0085] In one embodiment, the pressure in the receiving cavity 30 is -40Kpa to -70KPa. This arrangement reduces the amount of substances such as water vapor and oxygen in the battery pack case 200, and prevents the cell assemblies and each component in the battery pack case 200 from deteriorating over a long period of time due to water vapor and oxygen, which helps to extend the service life of the cell assemblies or each component inside the battery pack case 200.

[0086] 1 and 2, an exhaust hole 110 is provided in the battery pack case 200. The exhaust hole 110 allows the inside of the battery pack case 200 to be evacuated to a vacuum, thereby reducing the amount of substances such as water vapor in the battery pack case 200 and preventing deterioration and damage of components such as cell assemblies and batteries in the battery pack case 200 due to the long-term action of water vapor, thereby extending the service life of the battery pack 100.

[0087] 1 and 2, a battery pack case 200 is provided with a plurality of exhaust holes 110 that correspond to and communicate with a plurality of housing cavities 30. Such an arrangement improves the efficiency of the evacuation operation and helps reduce manufacturing costs.

[0088] 1 and 2, in one embodiment, the multiple accommodating cavities 30 communicate with each other, and the battery pack case 200 is provided with at least one exhaust hole 110 that communicates with the accommodating cavities 30. In this manner, the multiple accommodating cavities 30 can be simultaneously evacuated to a vacuum by the exhaust hole 110.

[0089] The communication method of the accommodating cavities 30 is not specifically limited, and for example, the accommodating cavities 30 may be communicated by the first openings 113 at the ends. Alternatively, a through hole may be provided in the structural beam 20 to communicate two adjacent accommodating cavities 30.

[0090] 1, the adhesive injection hole 109 or the exhaust hole 110, or the adhesive injection hole 109 and the exhaust hole 110 are provided on the top plate 101. However, in other embodiments, the adhesive injection hole 109 or the exhaust hole 110, or the adhesive injection hole 109 and the exhaust hole 110 may be provided on the bottom plate 102, the first frame 103, or the second frame 104.

[0091] Furthermore, the method of sealing the exhaust hole 110 is not specifically limited. For example, the exhaust hole 110 can be sealed by a sealing part or by filling it with an adhesive.

[0092] The adhesive injection hole 109 and the exhaust hole 110 may be the same hole or different holes. If they are the same hole, the adhesive may be injected before evacuating.

[0093] A battery pack 100 according to another embodiment of the present disclosure includes the above-described battery pack case 200. The battery pack 100 according to the present disclosure has high structural strength and rigidity, high space utilization rate, and high safety in use.

[0094] An electric vehicle 300 according to a further embodiment of the present disclosure includes a vehicle body and a battery pack 100 fixed to the vehicle body by a mounting portion 40.

[0095] In the electric vehicle 300 (see FIG. 5) according to the present disclosure, when the battery pack 100 having the above-mentioned high strength is attached to the vehicle, the structural strength of the battery pack 100 becomes part of the structural strength of the vehicle, thereby improving the structural strength of the vehicle, helping to achieve the design requirement for reducing the weight of the entire electric vehicle, and reducing the design and manufacturing costs of the vehicle.

[0096] In the description of this disclosure, unless otherwise clearly specified and limited, the terms "attached," "coupled," and "connected" should be understood in a broad sense, for example, as a fixed connection, a removable connection, or an integral connection, as a mechanical connection, or an electrical connection, as a direct connection, as an indirect connection via an intermediate medium, or as an internal communication between two parts. Those skilled in the art can understand the specific meaning of the above terms in the present disclosure according to the specific situation.

[0097] In the present description, a description that refers to the term "embodiment," "specific embodiment," "example," or the like means that the specific features, structures, materials, or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present description, exemplary expressions of the above terms are not necessarily limited to the same embodiment or example. In addition, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples as appropriate.

[0098] Although the embodiments of the present disclosure have been illustrated and described, as can be understood by those skilled in the art, various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present disclosure, and the scope of the present disclosure is limited by the claims and their equivalents. [Explanation of symbols]

[0099] 100 Battery Packs 200 Battery pack case 300 Electric Vehicles 10 Case body 101 Tabletop 102 Bottom plate 103 First Frame 1031 First frame body 1032 Second frame body 104 Second Frame 1041 Third frame body 1042 Fourth frame body 105 Reinforcement plate 106 Sub-cavity 107 Third Frame 108 Fourth Frame 109 Adhesive injection hole 110 Exhaust hole 111 Cavity 112 End plate 113 First Opening 20 Structural beams 201 Recess 202 Heat radiation passage 203 First side panel 204 Second side panel 205 Partition 30 Storage Cavity 40 Mounting part 401 Mounting hole

Claims

1. A battery pack case including a case body and at least one structural beam located within the case body and dividing an interior of the case body into a plurality of housing cavities, the case body includes a top plate and a bottom plate that are disposed opposite to each other along a first direction that is a height direction of the battery pack case, the structural beam is located between the top plate and the bottom plate, and at least one of the structural beams is joined to the top plate and the bottom plate; a mounting portion fixedly connected to an external support member is provided on the battery pack case; the case body includes a first frame and a second frame distributed on both sides of the case body along a third direction, the third direction being a width direction or a length direction of the battery pack case; At least one of the first frame and the second frame has a cavity therein, and a reinforcing plate is installed within the cavity to divide the cavity into a plurality of sub-cavities.

2. The battery pack case further includes an end plate, and a first opening is provided at an end of the case body along a second direction, and the end plate seals the first opening, and the second direction is a width direction or a length direction of the battery pack case, 2. The battery pack case of claim 1, wherein a first opening is provided on both ends of the case body along the second direction, the end plate includes a third frame and a fourth frame, the third frame and the fourth frame are connected to the case body to seal the case body, and seal the corresponding first opening.

3. 3. The battery pack case of claim 2, further comprising a sealing plate, a second opening being provided at an end of the accommodating cavity along the second direction, the sealing plate being positioned inside the end plate and closing a portion of the second opening adjacent to the bottom plate.

4. 3. The battery pack case of claim 2, further comprising a sealing plate, a second opening being provided at an end of the accommodating cavity along the second direction, the sealing plate being positioned inside the end plate and completely closing the second opening.

5. A battery pack case including a case body and at least one structural beam located within the case body and dividing an interior of the case body into a plurality of housing cavities, the case body includes a top plate and a bottom plate that are disposed opposite to each other along a first direction that is a height direction of the battery pack case, the structural beam is located between the top plate and the bottom plate, and at least one of the structural beams is joined to the top plate and the bottom plate; a mounting portion fixedly connected to an external support member is provided on the battery pack case; each structural beam includes a first side plate and a second side plate spaced apart along a third direction, the first side plate, the second side plate, the top plate and the bottom plate enclose a heat dissipation passage, the second direction is a width direction of the battery pack case and the third direction is a length direction of the battery pack case, or the second direction is the length direction of the battery pack case and the third direction is the width direction of the battery pack case; the structural beam further includes a partition plate connected to the first side plate and the second side plate and partitioning the heat dissipation passage into a plurality of sub-passages.

6. A battery pack case including a case body and at least one structural beam located within the case body and dividing an interior of the case body into a plurality of housing cavities, the case body includes a top plate and a bottom plate that are disposed opposite to each other along a first direction that is a height direction of the battery pack case, the structural beam is located between the top plate and the bottom plate, and at least one of the structural beams is joined to the top plate and the bottom plate; a mounting portion fixedly connected to an external support member is provided on the battery pack case; A battery pack case, comprising an adhesive injection hole, and each of the accommodating cavities correspondingly communicates with at least one of the adhesive injection holes.

7. A battery pack case including a case body and at least one structural beam located within the case body and dividing an interior of the case body into a plurality of housing cavities, the case body includes a top plate and a bottom plate that are disposed opposite to each other along a first direction that is a height direction of the battery pack case, the structural beam is located between the top plate and the bottom plate, and at least one of the structural beams is joined to the top plate and the bottom plate; a mounting portion fixedly connected to an external support member is provided on the battery pack case; The battery pack case is a sealed case, and the air pressure within the accommodating cavity is lower than the air pressure outside the battery pack case.

8. The battery pack case according to claim 7 , further comprising an exhaust hole.

9. A battery pack case described in any one of claims 1 to 8, wherein the case body is integrally molded with the structural beam.

10. A battery pack comprising the battery pack case according to any one of claims 1 to 9.

11. An electric vehicle comprising: a vehicle body; and the battery pack according to claim 10 fixed to the vehicle body by the mounting portion.

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