Battery box and battery pack

Abstract

The invention relates to the technical field of batteries, and provides a battery box and a battery pack. The battery box comprises a box body. A first installation area and a second installation area which are distributed in the first direction are arranged in the box body. Battery modules are arranged in the first mounting area and the second mounting area. Wherein in the second direction, the length of the first installation area is L1, the length of the second installation area is L2, and L1 is larger than L2. Wherein the first direction is the height direction of the box body, and an angle is formed between the first direction and the second direction. Therefore, based on the length arrangement of the first mounting area and the second mounting area, the space layout of the box body can be more reasonable to adapt to the mounting space of the SUV model, so that the mounting space of the SUV model is fully utilized, and the cruising ability of the vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery box and a battery pack. Background Art

[0002] In the related art, compared with sedans, SUVs (Sport Utility Vehicles) have more installation space in the Z direction (the height direction of the vehicle) and can carry higher battery packs. Current battery packs are usually single-layer structures, which cannot fully utilize the installation space of SUVs. Summary of the invention

[0003] An embodiment of the present invention provides a battery box and a battery pack. By forming a first installation area and a second installation area in the box, multiple layers of battery modules can be stacked in the box. Based on the length design of the first installation area and the second installation area, the battery box can make full use of the installation space of an SUV model.

[0004] In a first aspect, an embodiment of the present invention provides a battery box, comprising:

[0005] A box body has a first installation area and a second installation area distributed along a first direction, and battery modules are arranged in the first installation area and the second installation area, wherein along the second direction, the length of the first installation area is L1, and the length of the second installation area is L2, satisfying: L1>L2, wherein the first direction is the height direction of the box body, and the first direction is arranged at an angle to the second direction.

[0006] In one embodiment, along the second direction, the second installation area is disposed close to an end of the first installation area.

[0007] In one embodiment, the battery box further comprises:

[0008] A box cover, covering the box body;

[0009] Wherein, the box cover includes a first straight plate, an inclined plate and a second straight plate connected in sequence, and the first straight plate and the second straight plate are spaced apart along the second direction, wherein the distance between the first straight plate and the bottom surface of the box body is D1, and the distance between the second straight plate and the bottom surface of the box body is D2, satisfying: D1<D2.

[0010] In one embodiment, the inclination angle of the inclined plate is α, which satisfies: 30°≤α≤60°.

[0011] In one embodiment, the housing comprises:

[0012] Two first side plates, both extending along the second direction, and the two first side plates are spaced apart along a third direction, wherein the third direction is arranged at an angle to both the first direction and the second direction;

[0013] A second side plate connected between the first ends of the two first side plates;

[0014] A third side plate connected between the second ends of the two first side plates;

[0015] The bottom plate is connected to the two first side plates, the second side plate and the third side plate.

[0016] In one embodiment, the first side plate is connected to a first support member, and the first support member is configured to support the battery module, wherein the first support member is disposed at a junction of the first installation area and the second installation area.

[0017] In one embodiment, the first support member is connected to a partition plate, and the partition plate is located at the junction of the first installation area and the second installation area;

[0018] The battery module placed on the first support member is spaced apart from the partition, and a first pressure relief chamber is formed between the battery module and the partition.

[0019] In one embodiment, the first side plate is provided with a longitudinal beam, and the first support member is connected to the longitudinal beam, wherein a second pressure relief chamber is constructed in the first support member, a third pressure relief chamber is formed in the longitudinal beam, and the first pressure relief chamber, the second pressure relief chamber and the third pressure relief chamber are connected.

[0020] In one embodiment, the first support member comprises:

[0021] A first support portion connected to the longitudinal beam;

[0022] A second support portion connected to the first support portion, and the second support portion and the first support portion form a stepped support gap, and the support gap is configured to overlap the partition;

[0023] The second pressure relief chamber is formed in the first support portion, and the first support portion is constructed with a first conducting port and a second conducting port connected to the second pressure relief chamber, the first conducting port is connected to the first pressure relief chamber, and the second conducting port is connected to the third pressure relief chamber.

[0024] In one embodiment, the first side plate is further connected to a second support member, and the second support member is configured to support the battery module, wherein the battery module placed on the second support member is spaced apart from the bottom plate, and a fourth pressure relief chamber is formed between the battery module and the bottom plate.

[0025] In one embodiment, a fifth pressure relief chamber is configured in the second support member, and the third pressure relief chamber, the fourth pressure relief chamber, and the fifth pressure relief chamber are connected.

[0026] In one embodiment, the cavity height of the first pressure relief cavity is H, which satisfies: 5 mm ≤ H ≤ 20 mm.

[0027] In one embodiment, a cross beam is provided between the two first side plates, a reinforcing rib is provided between the cross beam and the second side plate, or a reinforcing rib is provided between the cross beam and the third side plate.

[0028] In one embodiment, two cross beams are provided, one of which is provided close to the second side plate, and the reinforcing rib is provided between the cross beam and the second side plate, and the other cross beam is provided close to the third side plate, and the reinforcing rib is provided between the cross beam and the third side plate.

[0029] In one embodiment, along the third direction, the reinforcing ribs are arranged to be spaced apart by at least two, and the spacing between each two adjacent reinforcing ribs is D3, satisfying: 60 mm ≤ D3 ≤ 300 mm.

[0030] In one embodiment, along the second direction, the length of the reinforcing rib is L3, and along the first direction, the width of the reinforcing rib is D4, satisfying: 60 mm ≤ L3 ≤ 150 mm, 50 mm ≤ D4 ≤ 100 mm.

[0031] In a second aspect, an embodiment of the present invention provides a battery pack, comprising:

[0032] A first battery module;

[0033] A second battery module;

[0034] As the aforementioned battery box;

[0035] The first battery module is arranged in the first installation area, the second battery module is arranged in the second installation area, and the first installation area and the second installation area are both filled with a foaming layer.

[0036] Beneficial effects of the embodiments of the present invention:

[0037] In the embodiment of the present invention, by forming the first installation area and the second installation area inside the box, the battery module can be installed in the first installation area and the second installation area respectively to form a multi-layer stacked battery module structure. Based on the length setting of the first installation area and the second installation area, the box space layout can be made more reasonable to adapt to the installation space of the SUV model, thereby making full use of the installation space of the SUV model and improving the vehicle's endurance. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 is an exploded view of a battery pack provided by an embodiment of the present invention;

[0040] Figure 2 It is one of the structural schematic diagrams of the battery box provided by the embodiment of the present invention;

[0041] Figure 3 This is the second structural schematic diagram of the battery box provided by the embodiment of the present invention;

[0042] Figure 4 is a cross-sectional view of a battery box provided by an embodiment of the present invention;

[0043] Figure 5 yes Figure 4 A partial enlarged view of the middle A;

[0044] Figure 6 It is a schematic diagram of the structure of a box cover provided by an embodiment of the present invention.

[0045] Reference numerals:

[0046] 10-box body, 110-first side plate, 120-second side plate, 130-third side plate, 140-bottom plate, 150-first support member, 1510-first support portion, 1520-second support portion, 1530-support notch, 1540-first conduction port, 1550-second conduction port, 160-partition plate, 170-longitudinal beam, 180-second support member, 20-first installation area, 30-second installation area, 40-box cover, 410-first straight plate, 420-inclined plate, 430-second straight plate, 50-first battery module, 60-second battery module, 710-first pressure relief chamber, 720-second pressure relief chamber, 730-third pressure relief chamber, 740-fourth pressure relief chamber, 750-fifth pressure relief chamber, 810-cross beam, 820-reinforcement rib. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the drawings; while "inside" and "outside" refer to the outline of the device.

[0048] For details, please refer to Figures 1 to 6 , an embodiment of the present application provides a battery box. The battery box includes a box body 10. The interior of the box body 10 has a first installation area 20 and a second installation area 30 distributed along a first direction. Battery modules are arranged in the first installation area 20 and the second installation area 30. Among them, along the second direction, the length of the first installation area 20 is L1, and the length of the second installation area 30 is L2, satisfying: L1>L2. Among them, the first direction is the height direction of the box body 10, and the first direction is arranged at an angle to the second direction.

[0049] In the embodiment of the present application, by forming the first installation area 20 and the second installation area 30 inside the box 10, the battery modules can be installed in the first installation area 20 and the second installation area 30 respectively to form a multi-layer stacked battery module structure. Based on the length setting of the first installation area 20 and the second installation area 30, the spatial layout of the box 10 can be made more reasonable to adapt to the installation space of the SUV model, thereby making full use of the installation space of the SUV model and improving the vehicle's endurance.

[0050] The first installation area 20 and the second installation area 30 are both square installation areas to adapt to the shape of the installation space of the SUV model.

[0051] In some embodiments, the first direction and the second direction are arranged at an acute angle. Alternatively, the first direction and the second direction are arranged at an obtuse angle. Alternatively, the first direction and the second direction are perpendicular to each other. In the embodiment of the present application, it is preferred that the first direction is perpendicular to the second direction.

[0052] Based on the fact that the first direction is the height direction of the box body 10, in the first direction, the first installation area 20 can be located below the second installation area 30. Thus, the battery modules in the first installation area 20 and the second installation area 30 are stacked up and down or spaced up and down. Since the length L1 of the first installation area 20 is greater than the length L2 of the second installation area 30, the length of the upper area of ​​the box body 10 can be made shorter, which can better adapt to the installation space of SUV models.

[0053] For example, L2=1 / 3L1. Or, L2=1 / 2L1. Wherein, L1 can be set to 1600 mm to 2100 mm. For example, the length L1 of the first installation area 20 is set to 1600 mm, 1800 mm, 2100 mm, or any value therebetween.

[0054] In some embodiments, the widths of the first mounting area 20 and the second mounting area 30 may be the same. The heights of the first mounting area 20 and the second mounting area 30 may also be the same.

[0055] In some embodiments, the number of the first installation area 20 can be set to one. One or more battery modules can be installed in the one first installation area 20. The number of the second installation area 30 can be set to one. One or more battery modules can be installed in the one second installation area 30.

[0056] In some embodiments, the number of first mounting areas 20 can be set to at least two. At least two first mounting areas 20 are arranged in sequence along the first direction. One or more battery modules can be installed in each first mounting area 20. The number of second mounting areas 30 can be set to at least two. At least two second mounting areas 30 are arranged in sequence along the first direction. One or more battery modules can be installed in each second mounting area 30.

[0057] The battery module may be a square cell, a soft pack cell or a cylindrical cell. In the embodiment of the present application, a cylindrical cell is preferably used.

[0058] In some embodiments, along the second direction, the second mounting area 30 is disposed close to an end of the first mounting area 20 .

[0059] It is understandable that, based on the second installation area 30 being arranged close to the end of the first installation area 20, the second installation area 30 can be located at the rear of the SUV vehicle during installation, thereby fully utilizing the height space at the rear of the SUV vehicle.

[0060] See also Figure 1In some embodiments, the battery box further includes a box cover 40. The box cover 40 covers the box body 10. The box cover 40 includes a first straight plate 410, an inclined plate 420, and a second straight plate 430 connected in sequence. Along the second direction, the first straight plate 410 and the second straight plate 430 are spaced apart. The distance between the first straight plate 410 and the bottom surface of the box body 10 is D1, and the distance between the second straight plate 430 and the bottom surface of the box body 10 is D2. Satisfies: D1<D2.

[0061] It is understandable that the box cover 40 is used to cover the box body 10 so as to seal and install the battery module in the battery box. Along the second direction, the first straight plate 410 and the second straight plate 430 are spaced apart, so the first straight plate 410, the inclined plate 420 and the second straight plate 430 will not form a "Z"-shaped connection structure. Based on making the distance D1 between the first straight plate 410 and the bottom surface of the box body 10 smaller than the distance D2 between the second straight plate 430 and the bottom surface of the box body 10, the height of the first installation area 20 can be defined by the distance between the first straight plate 410 and the bottom surface of the box body 10, and the height and the height of the first installation area 20 and the second installation area 30 can be defined by the distance between the second straight plate 430 and the bottom surface of the box body 10. Therefore, along the height direction of the box body 10, the projections of the first straight plate 410, the inclined plate 420 and the second straight plate 430 all overlap with the first installation area 20, and the projection of the second straight plate 430 also overlaps with the second installation area 30.

[0062] The distance D2 between the second straight plate 430 and the bottom surface of the box body 10 is greater than or equal to 250 mm. For example, the distance D2 between the second straight plate 430 and the bottom surface of the box body 10 can be set to 250 mm, 280 mm, 300 mm, etc.

[0063] In some embodiments, the length of the first straight plate 410 can be set to 1000 mm to 1400 mm. The length of the second straight plate 430 can be set to 500 mm to 700 mm.

[0064] The shape of the upper surface of the box body 10 matches the shape of the box cover 40 , so that the box cover 40 can fit on the upper surface of the box body 10 .

[0065] See also Figure 6 In some embodiments, the inclined plate 420 has an inclination angle of α, which satisfies: 30°≤α≤60°.

[0066] It is understandable that the inclination angle of the inclined plate 420 will affect the shape and sealing performance of the box cover 40 and the box body 10. When the inclination angle α of the inclined plate 420 is less than 30°, the inclined plate 420 will be too long, resulting in excessive material consumption of the box cover 40, causing cost increase and weight increase. When the inclination angle α of the inclined plate 420 is greater than 60°, the sealing difficulty of the box cover 40 and the box body 10 will be significantly increased.

[0067] For example, the inclination angle α of the inclined plate 420 can be set to 30 degrees, 45 degrees, 60 degrees, or any value therebetween.

[0068] like Figure 2 and Figure 3 As shown, in some embodiments, the box body 10 includes two first side panels 110, a second side panel 120, a third side panel 130 and a bottom panel 140. The two first side panels 110 extend along the second direction. The two first side panels 110 are spaced apart along the third direction. The third direction is arranged at an angle to the first direction and the second direction. The second side panel 120 is connected between the first ends of the two first side panels 110. The third side panel 130 is connected between the second ends of the two first side panels 110. The bottom panel 140 is connected to the two first side panels 110, the second side panel 120 and the third side panel 130.

[0069] It can be understood that the first side plate 110, the second side plate 120 and the third side plate 130 enclose and form a side wall of the battery box. The side wall is connected to the bottom plate 140, so as to form a space for accommodating the battery module.

[0070] The lower surfaces of the two first side panels 110 are fitted with the bottom panel 140, and the shape of the upper surfaces of the two first side panels 110 is adapted to the shape of the box cover 40. Specifically, the upper surface of the first side panel 110 includes a first straight edge, a hypotenuse, and a second straight edge. The spacing between the first straight edge and the bottom panel 140 is smaller than the spacing between the second straight edge and the bottom panel 140. The first straight edge corresponds to the first straight panel 410, the hypotenuse corresponds to the oblique panel 420, and the second straight edge corresponds to the second straight panel 430.

[0071] In some embodiments, the height of the second side plate 120 is less than the height of the third side plate 130 .

[0072] In some embodiments, the first direction, the second direction, and the third direction are all arranged at acute angles. Alternatively, the first direction, the second direction, and the third direction are all arranged at obtuse angles. Alternatively, the first direction, the second direction, and the third direction are perpendicular to each other.

[0073] like Figure 1 As shown, in some embodiments, the first direction may be the height direction of the box 10, the second direction may be the length direction of the box 10, and the third direction may be the width direction of the box 10.

[0074] like Figure 3 As shown, in some embodiments, the first side plate 110 is connected to a first support member 150. The first support member 150 is configured to support the battery module. The first support member 150 is disposed at the junction of the first installation area 20 and the second installation area 30.

[0075] It can be understood that by arranging the first support member 150 on the first side plate 110 and making the first support member 150 located at the junction of the first mounting area 20 and the second mounting area 30, the area below the first support member 150 is the first mounting area 20, so that the first battery module 50 is mounted below the first support member 150. The area above the first support member 150 is the second mounting area 30, so that the second battery module 60 is mounted on the first support member 150.

[0076] The first support member 150 may be welded to the first side plate 110. Alternatively, the first support member 150 may be fixed to the first side plate 110 by a fastener.

[0077] In some embodiments, a first support member 150 is disposed on each of the two first side plates 110, and the first support member 150 is disposed on the sides of the two first side plates 110 facing each other. The two first support members 150 may be symmetrically distributed along the long axis of the battery box.

[0078] like Figure 4 and Figure 5 As shown, in some embodiments, the first support member 150 is connected to a partition 160. The partition 160 is located at the junction of the first installation area 20 and the second installation area 30. The battery module placed on the first support member 150 is spaced apart from the partition 160, and a first pressure relief chamber 710 is formed between the battery module and the partition 160.

[0079] It is understandable that the partition 160 is horizontally arranged and is arranged on the first support member 150 to divide the first installation area 20 and the second installation area 30 by the partition 160. The first support members 150 are arranged on both first side panels 110, and the two ends of the partition 160 can be overlapped with the two first support members 150 respectively.

[0080] The battery module is spaced apart from the partition 160, so as to form a first pressure relief chamber 710 therebetween. When thermal runaway occurs in the battery module, the first pressure relief chamber 710 can be used for safety protection.

[0081] See also Figure 5 In some embodiments, the first side plate 110 is provided with a longitudinal beam 170. The first support member 150 is connected to the longitudinal beam 170. A second pressure relief chamber 720 is configured in the first support member 150. A third pressure relief chamber 730 is formed in the longitudinal beam 170. The first pressure relief chamber 710, the second pressure relief chamber 720 and the third pressure relief chamber 730 are connected.

[0082] It is understandable that the longitudinal beam 170 can be used to install the first support member 150 so that the first support member 150 can be reliably fixed in the battery box. Among them, the longitudinal beam 170 can be welded to the first side plate 110 and the bottom plate 140 to ensure that the longitudinal beam 170 is reliably fixed in the battery box. The second pressure relief chamber 720 in the first support member 150, the third pressure relief chamber 730 in the longitudinal beam 170 and the first pressure relief chamber 710 are connected. When the battery module located in the second installation area 30 has thermal runaway, the target cell pressure relief gas can flow along the first pressure relief chamber 710, the second pressure relief chamber 720 and the third pressure relief chamber 730 in sequence.

[0083] Among them, an explosion-proof valve may be constructed on the second side plate 120, and the gas inlet of the explosion-proof valve is connected to the third pressure relief chamber 730. Therefore, when the battery module located in the second installation area 30 has thermal runaway, the pressure relief gas of the target battery cell can flow along the first pressure relief chamber 710, the second pressure relief chamber 720 and the third pressure relief chamber 730 in sequence, and be released to the outside of the battery pack through the explosion-proof valve to ensure safety.

[0084] Please continue reading Figure 5 In some embodiments, the first support member 150 includes a first support portion 1510 and a second support portion 1520. The first support portion 1510 is connected to the longitudinal beam 170. The second support portion 1520 is connected to the first support portion 1510, and the second support portion 1520 and the first support portion 1510 form a stepped support gap 1530. The support gap 1530 is configured to overlap the partition 160. Among them, the second pressure relief chamber 720 is formed in the first support portion 1510. The first support portion 1510 is configured with a first conduction port 1540 and a second conduction port 1550 that are connected to the second pressure relief chamber 720. The first conduction port 1540 is connected to the first pressure relief chamber 710. The second conduction port 1550 is connected to the third pressure relief chamber 730.

[0085] It is understandable that the first support portion 1510 and the second support portion 1520 are used to form a support notch 1530 to overlap the partition 160, thereby realizing the connection between the partition 160 and the first support member 150. The second pressure relief chamber 720 is formed in the first support portion 1510, and the first conduction port 1540 and the second conduction port 1550 are constructed in the first support portion 1510 to realize the conduction between the second pressure relief chamber 720 and the first pressure relief chamber 710, and realize the conduction between the second pressure relief chamber 720 and the third pressure relief chamber 730.

[0086] The first support portion 1510 and the second support portion 1520 are integrally formed. The first support portion 1510 and the second support portion 1520 are connected in a substantially "Z" shape, thereby forming a stepped support gap 1530. Since the first support member 150 is provided on the side of the two first side panels 110 facing each other, the two sides of the partition 160 can be overlapped on the two support gaps 1530 respectively to achieve the placement of the partition 160.

[0087] Please continue reading Figure 5 In some embodiments, the first side plate 110 is further connected to a second support member 180. The second support member 180 is configured to support the battery module. The battery module placed on the second support member 180 is spaced apart from the bottom plate 140, and a fourth pressure relief chamber 740 is formed between the battery module and the bottom plate 140.

[0088] It is understandable that the second support member 180 provided on the side panel can be used to support the battery module in the first installation area 20, and the battery module is spaced apart from the bottom plate 140, thereby forming a fourth pressure relief chamber 740. When thermal runaway occurs in the battery module, the fourth pressure relief chamber 740 can be used for safety protection. Among them, the battery module in the first installation area 20 is depressurized through the first pressure relief chamber 710, and the battery module in the second installation area 30 is depressurized through the fourth pressure relief chamber 740, so that the battery module in the first installation area 20 and the battery module in the second installation area 30 have relatively independent pressure relief chambers, ensuring gas-electric isolation during thermal runaway.

[0089] The second support member 180 may be welded to the first side plate 110. Alternatively, the second support member 180 may be fixed to the first side plate 110 by a fastener.

[0090] In some embodiments, a second support member 180 is disposed on each of the two first side plates 110, and the second support member 180 is disposed on the side of the two first side plates 110 facing each other. The two second support members 180 can be symmetrically distributed along the long axis of the battery box. Based on the two symmetrically arranged second support members 180, the two ends of the battery module located in the first installation area 20 can be overlapped on the two second support members 180 respectively.

[0091] Please continue reading Figure 5 In some embodiments, a fifth pressure relief chamber 750 is constructed in the second support member 180, and the third pressure relief chamber 730, the fourth pressure relief chamber 740 and the fifth pressure relief chamber 750 are connected.

[0092] It is understandable that when the battery module located in the first installation area 20 experiences thermal runaway, the target cell pressure relief gas may flow along the fourth pressure relief chamber 740 , the fifth pressure relief chamber 750 , and the third pressure relief chamber 730 in sequence.

[0093] Among them, an explosion-proof valve may be constructed on the second side plate 120, and the gas inlet of the explosion-proof valve is connected to the third pressure relief chamber 730. Therefore, when the battery module located in the first installation area 20 has thermal runaway, the pressure relief gas of the target battery cell can flow along the fourth pressure relief chamber 740, the fifth pressure relief chamber 750 and the third pressure relief chamber 730 in sequence, and be released to the outside of the battery pack through the explosion-proof valve to ensure safety.

[0094] The battery modules in the first installation area 20 and the battery modules in the second installation area 30 eventually release the target cell pressure relief gas to the outside of the battery pack through the third pressure relief chamber 730 and its corresponding explosion-proof valve, which can reduce the number of pressure relief chambers and the number of explosion-proof valves, thereby reducing the cost of the battery box while ensuring safety.

[0095] In some embodiments, the cavity height of the first pressure relief cavity 710 is H, which satisfies: 5 mm ≤ H ≤ 20 mm.

[0096] It is understandable that the height of the first pressure relief chamber 710 will affect the pressure relief effect. When the height H of the first pressure relief chamber 710 is less than 5 mm, the space of the first pressure relief chamber 710 is too small, which may cause the impact force of the pressure relief gas of the target battery cell to be too large, and may damage the partition 160, the first support member 150, the longitudinal beam 170, the first side plate 110, the second side plate 120, etc. When the height H of the first pressure relief chamber 710 is greater than 20 mm, the first pressure relief chamber 710 will occupy more height space in the battery box, resulting in a reduction in the thickness of the battery module and a reduction in capacity, which affects the vehicle's endurance.

[0097] For example, the cavity height H of the first pressure relief cavity 710 is set to 5 mm, 10 mm, 15 mm, 20 mm, or any value therebetween.

[0098] The cavity height of the fourth pressure relief cavity 740 may be the same as the cavity height of the first pressure relief cavity 710. The cavity height of the second pressure relief cavity 720 may be reasonably selected based on the thickness of the first support portion 1510. The cavity height of the third pressure relief cavity 730 may be reasonably selected based on the width of the longitudinal beam 170. The cavity height of the fifth pressure relief cavity 750 may be reasonably selected based on the thickness of the second support member 180.

[0099] like Figure 2 As shown, in some embodiments, a crossbeam 810 is disposed between the two first side panels 110 , a reinforcing rib 820 is disposed between the crossbeam 810 and the second side panel 120 , or a reinforcing rib 820 is disposed between the crossbeam 810 and the third side panel 130 .

[0100] It is understandable that the crossbeam 810 can strengthen the structure of the battery box in the width direction, and the crossbeam 810 can also strengthen the structure of both ends of the battery box in the length direction by connecting the reinforcing ribs 820 and cooperating with the reinforcing ribs 820.

[0101] Based on the arrangement of the cross beam 810 and the reinforcing ribs 820 , the structural strength of the battery box can be improved, and the energy absorption effect of the battery box can be improved by more than 30%.

[0102] For example, the reinforcing rib 820 may be provided only between the cross beam 810 and the second side plate 120 in the battery box. Alternatively, the reinforcing rib 820 may be provided only between the cross beam 810 and the third side plate 130 in the battery box.

[0103] In some embodiments, two cross beams 810 are provided. One of the cross beams 810 is provided near the second side plate 120. A reinforcing rib 820 is provided between the cross beam 810 and the second side plate 120. Another cross beam 810 is provided near the third side plate 130. A reinforcing rib 820 is provided between the cross beam 810 and the third side plate 130.

[0104] It is understandable that two cross beams 810 may be provided in the battery box, one cross beam 810 is provided close to the second side plate 120, and a reinforcing rib 820 is provided between the cross beam 810 and the second side plate 120. The other cross beam 810 is provided close to the third side plate 130, and a reinforcing rib 820 is provided between the cross beam 810 and the third side plate 130. The area between the two cross beams 810 is the first installation area 20.

[0105] In some embodiments, the crossbeam 810 may be configured as a square beam that spans the width direction of the battery box. The crossbeam 810 may have a certain height, for example, the height of the crossbeam 810 is the same as the height of the first battery module 50. The two ends of the crossbeam 810 may be welded to the two first side plates 110. Alternatively, the two ends of the crossbeam 810 may be fixed to the two first side plates 110 by fasteners. The bottom of the crossbeam 810 may be welded to the bottom plate 140. Alternatively, the bottom of the crossbeam 810 may be fixed to the bottom plate 140 by fasteners.

[0106] In some embodiments, the reinforcing rib 820 may be configured as a square rib. The two ends of the reinforcing rib 820 may be welded to the cross beam 810 and the second side plate 120, respectively. Alternatively, the two ends of the reinforcing rib 820 may be fixed to the cross beam 810 and the second side plate 120, respectively, by fasteners. Alternatively, the two ends of the reinforcing rib 820 may be welded to the cross beam 810 and the third side plate 130, respectively. Alternatively, the two ends of the reinforcing rib 820 may be fixed to the cross beam 810 and the third side plate 130, respectively, by fasteners.

[0107] In some embodiments, along the third direction, the reinforcing ribs 820 are arranged at intervals of at least two, and the distance between each two adjacent reinforcing ribs 820 is D3, satisfying: 60 mm ≤ D3 ≤ 300 mm.

[0108] It is understandable that the reinforcing ribs 820 extend along the second direction. If the number of reinforcing ribs 820 is set to at least two along the third direction, the structural strength of the battery box can be further improved, and the energy absorption effect of the battery box can be improved.

[0109] The distance D3 between each two adjacent reinforcing ribs 820 will affect the overall performance of the battery box. If the distance D3 between each two adjacent reinforcing ribs 820 is less than 60 mm, when the battery box is impacted by external force and the reinforcing ribs 820 are deformed, the reinforcing ribs 820 are likely to cause the battery module to be squeezed, resulting in a safety hazard. If the distance D3 between each two adjacent reinforcing ribs 820 is greater than 300 mm, the number of reinforcing ribs 820 will be small, and the structural reinforcement effect will be poor.

[0110] For example, the distance D3 between each two adjacent reinforcing ribs 820 can be set to 60 mm, 100 mm, 150 mm, 200 mm, 250 mm, 300 mm, or any value therebetween.

[0111] In some embodiments, the spacing D3 between each two adjacent reinforcing ribs 820 may be the same. Alternatively, the spacing D3 between each two adjacent reinforcing ribs 820 may be different. For example, the reinforcing ribs 820 are set to 4, namely, rib No. 1, rib No. 2, rib No. 3, and rib No. 4. The spacing between rib No. 1 and rib No. 2 is D31. The spacing between rib No. 2 and rib No. 3 is D32. The spacing between rib No. 3 and rib No. 4 is D33. D31 = D32 = D33 can be made. Alternatively, D31> D32> D33 can be made. Alternatively, D31< D32< D33 can be made.

[0112] In some embodiments, the number of reinforcing ribs 820 is set to 2 to 5, and the number and spacing of the reinforcing ribs 820 can be reasonably selected based on the width of the battery box. For example, the number of reinforcing ribs 820 is set to 2, 3, 4 or 5. Among them, the multiple reinforcing ribs 820 can be symmetrically arranged along the long axis of the battery box, or can be asymmetrically arranged.

[0113] In some embodiments, along the second direction, the length of the reinforcing rib 820 is L3, and along the first direction, the width of the reinforcing rib 820 is D4, satisfying: 60 mm ≤ L3 ≤ 150 mm, 50 mm ≤ D4 ≤ 100 mm.

[0114] It is understandable that the length and width of the reinforcing rib 820 will affect the layout inside the battery box. When the length L3 of the reinforcing rib 820 is less than 60 mm, when the battery box is subjected to external force impact and the reinforcing rib 820 is deformed, the reinforcing rib 820 is likely to cause the battery module to be squeezed, resulting in a safety hazard. When the length L3 of the reinforcing rib 820 is greater than 150 mm, it will occupy more space inside the battery box, resulting in a reduction in the space of the first installation area 20 and the second installation area 30. As a result, the size of the first battery module 50 and the second battery module 60 will be reduced, and the capacity of the first battery module 50 and the second battery module 60 will become smaller, affecting the endurance of the vehicle. At the same time, when the length L3 of the reinforcing rib 820 is greater than 150 mm, it will also cause the consumables of the reinforcing rib 820 to increase and the weight to increase. When the width of the reinforcing rib 820 is less than 50 mm, the structural reinforcement effect of the reinforcing rib 820 will be poor, affecting the energy absorption effect of the battery box. When the width of the reinforcing rib 820 is greater than 100 mm, the spatial layout of the reinforcing rib 820 will be affected.

[0115] For example, the length L3 of the reinforcing rib 820 is set to 60 mm, 80 mm, 100 mm, 120 mm, 150 mm, or any value therebetween. The width D4 of the reinforcing rib 820 is set to 50 mm, 80 mm, 100 mm, or any value therebetween.

[0116] The embodiment of the present application further provides a battery pack. The battery pack includes a first battery module 50, a second battery module 60, and a battery box as described in the above embodiment. The first battery module 50 is disposed in the first installation area 20, and the second battery module 60 is disposed in the second installation area 30.

[0117] In the embodiment of the present application, by forming the first installation area 20 and the second installation area 30 inside the box 10, the first battery module 50 and the second battery module 60 can be installed in the first installation area 20 and the second installation area 30 respectively, forming a multi-layer stacked battery module structure. Based on the length setting of the first installation area 20 and the second installation area 30, the spatial layout of the box 10 can be made more reasonable to adapt to the installation space of the SUV model, thereby making full use of the installation space of the SUV model and improving the vehicle's endurance.

[0118] The length, width and height of the first battery module 50 are respectively matched with the length, width and height of the first installation area 20. The length, width and height of the second battery module 60 are respectively matched with the length, width and height of the second installation area 30.

[0119] In some embodiments, the first battery module 50 and the second battery module 60 each include a plurality of cylindrical battery cells.

[0120] The battery packs in the embodiments of the present application all use cylindrical cells to reduce the cost of the battery pack and make it easier to achieve standardization. At the same time, cylindrical cells can also make the battery pack more powerful and meet the needs of fast charging.

[0121] In some embodiments, the first installation area 20 and the second installation area 30 are both filled with a foaming layer.

[0122] It is understandable that after the first battery module 50 is installed in the first installation area 20 and the second battery module 60 is installed in the second installation area 30, the first battery module 50 and the second battery module 60 can be fixed by filling the first installation area 20 and the second installation area 30 with foaming material and forming a foaming layer. On the one hand, the first battery module 50 and the second battery module 60 can be fixed without welding, which can simplify the production process to a certain extent. On the other hand, it may protect the first battery module 50 and the second battery module 60 and improve the buffering capacity of the battery box.

[0123] The embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery box, characterized in that: include: A box body has a first installation area and a second installation area distributed along a first direction, and battery modules are arranged in the first installation area and the second installation area, wherein along the second direction, the length of the first installation area is L1, and the length of the second installation area is L2, satisfying: L1>L2, wherein the first direction is the height direction of the box body, and the first direction is arranged at an angle to the second direction.

2. The battery box according to claim 1, characterized in that: Along the second direction, the second installation area is arranged close to an end of the first installation area.

3. The battery box according to claim 1 or 2, characterized in that: The battery box also includes: A box cover, covering the box body; Wherein, the box cover includes a first straight plate, an inclined plate and a second straight plate connected in sequence, and the first straight plate and the second straight plate are spaced apart along the second direction, wherein the distance between the first straight plate and the bottom surface of the box body is D1, and the distance between the second straight plate and the bottom surface of the box body is D2, satisfying: D1<D2.

4. The battery box according to claim 3, characterized in that: The inclination angle of the inclined plate is α, which satisfies: 30°≤α≤60°.

5. The battery box according to claim 1 or 2, characterized in that: The box body comprises: Two first side plates, both extending along the second direction, and the two first side plates are spaced apart along a third direction, wherein the third direction is arranged at an angle to both the first direction and the second direction; A second side plate connected between the first ends of the two first side plates; A third side plate connected between the second ends of the two first side plates; The bottom plate is connected to the two first side plates, the second side plate and the third side plate.

6. The battery box according to claim 5, characterized in that: The first side plate is connected to a first support member, and the first support member is configured to support the battery module, wherein the first support member is disposed at a junction of the first installation area and the second installation area.

7. The battery box according to claim 6, characterized in that: The first support member is connected with a partition, and the partition is located at the junction of the first installation area and the second installation area; The battery module placed on the first support member is spaced apart from the partition, and a first pressure relief chamber is formed between the battery module and the partition.

8. The battery box according to claim 7, characterized in that: The first side plate is provided with a longitudinal beam, and the first support member is connected to the longitudinal beam, wherein a second pressure relief chamber is constructed in the first support member, a third pressure relief chamber is formed in the longitudinal beam, and the first pressure relief chamber, the second pressure relief chamber and the third pressure relief chamber are connected.

9. The battery box according to claim 8, characterized in that: The first support member comprises: A first support portion connected to the longitudinal beam; A second support portion connected to the first support portion, and the second support portion and the first support portion form a stepped support gap, and the support gap is configured to overlap the partition; Among them, the second pressure relief chamber is formed in the first support part, and the first support part is constructed with a first conducting port and a second conducting port connected to the second pressure relief chamber, the first conducting port is connected to the first pressure relief chamber, and the second conducting port is connected to the third pressure relief chamber.

10. The battery box according to claim 8, characterized in that: The first side plate is also connected to a second support member, which is configured to support the battery module, wherein the battery module placed on the second support member is spaced apart from the bottom plate, and a fourth pressure relief chamber is formed between the battery module and the bottom plate.

11. The battery box according to claim 10, characterized in that: A fifth pressure relief chamber is configured in the second support member, and the third pressure relief chamber, the fourth pressure relief chamber and the fifth pressure relief chamber are connected.

12. The battery box according to claim 7, characterized in that: The cavity height of the first pressure relief cavity is H, which satisfies: 5 mm ≤ H ≤ 20 mm.

13. The battery box according to claim 5, characterized in that: A crossbeam is arranged between the two first side plates, a reinforcing rib is arranged between the crossbeam and the second side plate, or a reinforcing rib is arranged between the crossbeam and the third side plate.

14. The battery box according to claim 13, characterized in that: There are two cross beams, one of which is arranged close to the second side plate, and the reinforcing rib is arranged between the cross beam and the second side plate, and the other cross beam is arranged close to the third side plate, and the reinforcing rib is arranged between the cross beam and the third side plate.

15. The battery box according to claim 13, characterized in that: Along the third direction, the reinforcing ribs are arranged to be spaced apart by at least two, and the distance between each two adjacent reinforcing ribs is D3, satisfying: 60 mm ≤ D3 ≤ 300 mm.

16. The battery box according to claim 13, characterized in that: Along the second direction, the length of the reinforcing rib is L3, and along the first direction, the width of the reinforcing rib is D4, satisfying: 60 mm ≤ L3 ≤ 150 mm, 50 mm ≤ D4 ≤ 100 mm.

17. A battery pack, characterized in that: include: A first battery module; A second battery module; A battery box as claimed in any one of claims 1 to 16; The first battery module is arranged in the first installation area, the second battery module is arranged in the second installation area, and the first installation area and the second installation area are both filled with a foaming layer.

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