Battery box and battery pack

Abstract

The utility model provides a battery box and a battery pack, and relates to the technical field of batteries. The battery box comprises a box cover, a box body, a partition plate and two longitudinal beams, the box cover covers the box body to define a mounting cavity; the mounting cavity is provided with two first side walls which are oppositely arranged; the two longitudinal beams are respectively arranged on the two first side walls; the two ends of the partition plate are in lap joint with the two longitudinal beams correspondingly. The partition plate divides the mounting cavity into a lower-layer module mounting cavity and an upper-layer module mounting cavity, and the side, close to the box cover, of the longitudinal beam is configured to abut against the upper-layer battery module. According to the battery module, the longitudinal beams and the partition plates are arranged as the brackets for supporting the upper-layer battery module, so that the upper-layer battery module can be supported, the upper-layer module mounting cavity and the lower-layer module mounting cavity can be isolated, the thermal interference of the upper-layer battery module and the lower-layer battery module can be reduced, and the brackets formed by the longitudinal beams and the partition plates are of discrete structures; therefore, the forming difficulty of the battery box can be reduced, and the manufacturing efficiency of the battery box can be further improved.

Description

Technical Field

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

[0002] With the mass production of large cylindrical cells in domestic and foreign markets, the battery system design based on large cylindrical cells has become an important application solution for the battery system of new energy vehicles. The battery system is mainly divided into single-layer battery system and double-layer battery system according to the number of layers of battery modules in the Z direction. Since the Z-direction dimension of the space used to install the battery pack of new energy vehicles is large, the double-layer battery system can make full use of the Z-direction space of new energy vehicles. Therefore, the double-layer battery system is widely used in new energy vehicles.

[0003] However, in the design of the double-layer battery system, the bracket supporting the upper battery module is an integral structure. The bracket not only needs to be provided with a structure that cooperates with the upper battery module and a structure that connects with the box body, but also needs to be provided with a hole inside the bracket for pressure relief of the battery module. As a result, it is difficult to form the bracket, resulting in low manufacturing efficiency of the battery box. Utility Model Content

[0004] The embodiments of the present application provide a battery box and a battery pack, which can improve the problem of low manufacturing efficiency of the battery box.

[0005] In the first aspect, an embodiment of the present application provides a battery box, which includes a box cover, a box body, a partition and two longitudinal beams; the box cover is covered with the box body to define an installation cavity; the installation cavity has two oppositely arranged first side walls; the two longitudinal beams are respectively arranged on the two first side walls; the two ends of the partition are overlapped with the two longitudinal beams respectively; wherein the partition divides the installation cavity into a lower module installation cavity and an upper module installation cavity, and the side of the longitudinal beam close to the box cover is a first side surface, and the first side surface is configured to abut against the upper battery module.

[0006] In one embodiment, a step groove is provided on a side of the longitudinal beam away from the first side wall where the longitudinal beam is located, and the step groove has a first groove wall parallel to the box cover, and both ends of the partition are overlapped with the first groove walls of the two longitudinal beams respectively.

[0007] In one embodiment, the step groove also has a second groove wall arranged at an angle to the first groove wall, an upper pressure relief channel is arranged inside the longitudinal beam, a first through hole is arranged on the second groove wall, a second through hole is arranged on the side of the longitudinal beam close to the first side wall where the longitudinal beam is located, and the first through hole and the second through hole are respectively connected to the upper pressure relief channel; an upper pressure relief valve mounting hole is arranged on the side plate of the box body, and the upper pressure relief valve mounting hole is connected to the second through hole.

[0008] In one embodiment, a support bar is provided on one side of the partition close to the box cover, the axis of the support bar is parallel to the partition, and the side of the support bar close to the box cover is configured to abut against the upper battery module.

[0009] In one embodiment, a first support beam is protruding from the first side wall, and the first support beam is in contact with the longitudinal beam at the first end close to the box cover. In one embodiment, the installation cavity further has two second side walls arranged opposite to each other, and the two first side walls, the two second side walls and the opposite surfaces between the box cover and the box body define the installation cavity; the battery box further includes two cross beams, which are respectively arranged on the two second side walls, and the other two ends of the partition are respectively overlapped with the two cross beams.

[0010] In one embodiment, the battery box further includes a reinforcing beam, which is disposed between each cross beam and the second side wall where the cross beam is located, and two ends of the reinforcing beam are respectively connected to the cross beam and the second side wall adjacent thereto.

[0011] In one embodiment, the battery box further includes a middle beam, the axis of which is parallel to the axis of the cross beams and is located between the two cross beams, and both ends of the middle beam are respectively connected to the first side wall.

[0012] In one embodiment, a second support beam is provided on a side of the first side wall facing away from the box cover, and a side of the second support beam close to the box cover is configured to abut against the lower battery module.

[0013] In one embodiment, a lower pressure relief channel is provided inside the second support beam, a third through hole is provided on the side of the second support beam away from the first side wall connected thereto, a fourth through hole is provided on the side of the second support beam close to the first side wall where the second support beam is located, and the third through hole and the fourth through hole are respectively connected to the lower pressure relief channel; a lower pressure relief valve mounting hole is provided on the side plate of the box body, and the lower pressure relief valve mounting hole is connected to the fourth through hole. In one embodiment, a longitudinal beam bracket is provided on the side of the longitudinal beam close to the box cover, one side of the longitudinal beam bracket is connected to the longitudinal beam, and the other side is connected to the first side wall.

[0014] In a second aspect, an embodiment of the present application provides a battery pack, which includes an upper battery module, a lower battery module and the aforementioned battery box; the upper battery module is arranged in the upper module mounting cavity; the lower battery module is arranged in the lower module mounting cavity.

[0015] Beneficial effects of the embodiments of the present application:

[0016] In an embodiment of the present application, longitudinal beams and partitions are provided as brackets for supporting the upper battery module, thereby achieving support for the upper battery module and isolation of the upper module mounting cavity and the lower module mounting cavity to reduce thermal interference between the upper and lower battery modules, and making the bracket composed of the longitudinal beams and partitions a discrete structure so that they can be manufactured separately, thereby reducing the difficulty of forming them and further improving the manufacturing efficiency of the battery box. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 is a schematic diagram of the structure of a battery box provided in an embodiment of the present application;

[0019] Figure 2 is a top view of a box provided in an embodiment of the present application;

[0020] Figure 3 is along Figure 2 Sectional view of AA in the middle;

[0021] Figure 4 yes Figure 3 The enlarged view of point D in the middle;

[0022] Figure 5 yes Figure 3 The enlarged view of point B in the middle;

[0023] Figure 6 is a schematic diagram of the position of a beam provided in an embodiment of the present application;

[0024] Figure 7 yes Figure 6 Enlarged view of point C in the middle;

[0025] Figure 8 It is a schematic diagram of the structure of the battery pack provided in the embodiment of the present application.

[0026] Description of reference numerals:

[0027] 001-battery pack;

[0028] 011-battery box;

[0029] 111- box cover;

[0030] 112-box; 1121-bottom guard plate; 1122-side plate; 11221-upper pressure relief valve mounting hole; 11222-lower pressure relief valve mounting hole; 1123-lower module mounting cavity; 1124-upper module mounting cavity; 1125-first support beam;

[0031] 1126 - second support beam; 11261 - third through hole; 11262 - fourth through hole; 11263 - lower pressure relief channel;

[0032] 1131- partition; 1132- heat insulation layer;

[0033] 114-longitudinal beam; 1141-first side surface; 1142-step groove; 11421-first groove wall; 11422-second groove wall; 1143-upper pressure relief channel; 1144-first through hole; 1145-second through hole; 1146-longitudinal beam bracket; 1147-bolt;

[0034] 115- support bar;

[0035] 116-cross beam; 117-reinforcement beam; 118-middle beam; 119-sealing pad;

[0036] 012-Upper battery module. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0038] In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, 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 accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0039] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] See also Figure 1 , Figure 1It is a schematic diagram of the structure of the battery box 011 provided by the embodiment of the present application. The embodiment of the present application provides a battery box 011, which includes a box cover 111, a box body 112, a partition 1131 and two longitudinal beams 114. The box cover 111 covers the box body 112 to define an installation cavity. The installation cavity has two first side walls arranged opposite to each other. The two longitudinal beams 114 are respectively arranged on the two first side walls. The two ends of the partition 1131 overlap the two longitudinal beams 114 respectively. Among them, the partition 1131 divides the installation cavity into a lower module installation cavity 1123 and an upper module installation cavity 1124. The side of the longitudinal beam 114 close to the box cover 111 is a first side 1141. The first side 1141 is configured to abut against the upper battery module.

[0042] It can be understood that the box body 112 includes a bottom guard plate 1121 and four side plates 1122 connected end to end to form a frame structure. The bottom guard plate 1121 is arranged at one end of the frame structure to cover one end of its inner cavity. The other end of the frame structure is covered with the box cover 111.

[0043] The partition 1131 can be fixed to the longitudinal beam 114 by glue, or welded to the longitudinal beam 114, or fixed to the longitudinal beam 114 by injecting glue into the installation cavity after the battery pack is assembled. The longitudinal beam 114 can be integrally formed with the side wall of the box body 112 by aluminum extrusion process, or fixed to the first side wall by screws or welding.

[0044] In addition, the upper module installation cavity 1124 is used to install the upper battery module, and in order to facilitate pressure relief, the explosion-proof valve on the battery cell of the upper battery module is spaced from the partition 1131 to form a buffer space required for the explosion-proof valve to be braked between the explosion-proof valve and the partition 1131. Correspondingly, the lower module installation cavity 1123 is used to install the lower battery module, and in order to facilitate pressure relief, the explosion-proof valve on the battery cell of the lower battery module is spaced from the bottom guard plate 1121 of the battery box 011 to form a buffer space required for the explosion-proof valve to be braked between the explosion-proof valve and the bottom guard plate 1121.

[0045] Exemplarily, the partition 1131 is a steel plate and the longitudinal beam 114 is an extruded aluminum part.

[0046] In this embodiment, by setting the longitudinal beam 114 and the partition 1131 as a bracket to support the upper battery module, it is possible to support the upper battery module and isolate the upper module mounting cavity 1124 and the lower module mounting cavity 1123 to reduce thermal interference between the upper and lower battery modules, and make the bracket composed of the longitudinal beam 114 and the partition 1131 a discrete structure so that it can be manufactured separately, thereby reducing its molding difficulty and further improving the manufacturing efficiency of the battery box 011.

[0047] See also Figure 2 and Figure 3 , Figure 2 is a top view of the box 112 provided in the embodiment of the present application, Figure 3 is along Figure 2 In one embodiment, a step groove 1142 is provided on the side of the longitudinal beam 114 away from the first side wall where the longitudinal beam 114 is located. The step groove 1142 has a first groove wall 11421 parallel to the box cover 111. Both ends of the partition plate 1131 overlap the first groove walls 11421 of the two longitudinal beams 114 respectively.

[0048] In this embodiment, by providing a step groove 1142 on the longitudinal beam 114, on the one hand, the first groove wall 11421 supports the partition 1131, so that the upper battery module and the partition 1131 located on the first side 1141 can be spaced apart to form a gap between the upper battery module and the partition 1131, and then a buffer space required for braking the explosion-proof valve can be formed between the explosion-proof valve and the partition 1131, so as to improve the reliability of the battery pack; on the other hand, the structure supporting the upper battery module and the partition 1131 is integrated on the longitudinal beam 114, so that the first groove wall 11421 and the first side 1141 can be respectively formed based on the same processing reference, so that the buffer space required for braking the explosion-proof valve of the upper battery module can be controlled by processing, thereby reducing the difficulty of assembly.

[0049] See also Figure 3 In one embodiment, the step groove 1142 also has a second groove wall 11422 arranged at an angle to the first groove wall 11421, an upper pressure relief channel 1143 is arranged inside the longitudinal beam 114, the second groove wall 11422 is arranged with a first through hole 1144, and a second through hole 1145 is arranged on the side of the longitudinal beam 114 close to the first side wall where the longitudinal beam 114 is located, and the first through hole 1144 and the second through hole 1145 are respectively connected to the upper pressure relief channel 1143; the side plate 1122 of the box body 112 is provided with an upper pressure relief valve mounting hole 11221, and the upper pressure relief valve mounting hole 11221 is connected to the second through hole 1145.

[0050] Exemplarily, along the axis of the longitudinal beam 114 , a plurality of first through holes 1144 are disposed on the second slot wall 11422 .

[0051] In this embodiment, through the above-mentioned arrangement, when the upper battery module thermally runs away and generates a large amount of gas, the gas can flow from the gap between the upper battery module and the partition 1131, the first through hole 1144, the upper pressure relief channel 1143 and the second through hole 1145 to the upper pressure relief valve in sequence, so that the gas generated by the battery module is discharged from the battery pack by braking the upper pressure relief valve, thereby improving the safety of the battery pack.

[0052] See also Figure 1In one embodiment, a support bar 115 is provided on the side of the partition 1131 close to the box cover 111. The axis of the support bar 115 is parallel to the partition 1131. The side of the support bar 115 close to the box cover 111 is configured to abut against the upper battery module. The side of the support bar 115 close to the box cover 111 is coplanar with the first side surface 1141. The side of the support bar 115 close to the box cover 111 is the top surface of the support bar 115.

[0053] Optionally, the axis of the support bar 115 is perpendicular to the axis of the longitudinal beam 114 .

[0054] Specifically, support bars 115 are provided at both ends of the battery module along the axis of the longitudinal beam 114. In this way, the side wall of the gap between the support bar 115 and the upper battery module, the second groove wall 11422, the plastic support of the upper battery module and the partition 1131 form an upper pressure relief chamber. The upper pressure relief chamber is vented and depressurized only through the first through hole 1144.

[0055] It can be understood that when only the longitudinal beam 114 supports the upper battery module, the upper battery module is supported on a smaller surface, resulting in poor positional stability of the upper battery module.

[0056] Based on this, in this embodiment, the upper battery module is further supported by providing support bars 115, thereby increasing the support surface of the battery box 011 for the upper battery module, thereby improving the position stability of the upper battery module.

[0057] In addition, the support bar 115 is elastic. Specifically, the support bar 115 may be foam. In this way, the support bar 115 can be compressed so that the top surface of the support bar 115 is coplanar with the first side surface 1141, thereby reducing the flatness requirements of the support bar 115 and the size requirements that the top surface of the support bar 115 needs to be coplanar with the first side surface 1141, thereby reducing the manufacturing difficulty.

[0058] Please join Figure 3 In one embodiment, a first support beam 1125 is protruded from the first side wall. The first end of the first support beam 1125 close to the box cover 111 abuts against the longitudinal beam 114 .

[0059] It can be understood that the first support beam 1125 is integrally formed with the side wall of the battery box 011, specifically, is integrally formed by extruding aluminum.

[0060] In addition, the longitudinal beam 114 is fastened to the first support beam 1125 by means of bolts 1147. The first support beam 1125 is extended along the axial direction of the longitudinal beam 114, and the length of the first support beam 1125 is the same as the length of the longitudinal beam 114.

[0061] In this embodiment, the first support beam 1125 is protruded from the first side wall, so that the longitudinal beam 114 is supported by the first support beam 1125 , thereby improving the position stability of the longitudinal beam 114 .

[0062] In one embodiment, the battery box 011 further includes a sealing gasket 119 . The sealing gasket 119 is disposed between the first support beam 1125 and the longitudinal beam 114 .

[0063] It can be understood that there is a gap between the longitudinal beam 114 and the first side wall and between the longitudinal beam 114 and the first support beam 1125, so that hot air can easily flow through the gap, which will cause thermal interference between the lower battery module and the upper battery module. When pouring glue, the glue fills the lower module mounting cavity 1123 and the upper module mounting cavity 1124 respectively. The glue in the lower module mounting cavity 1123 needs to fill the lower module mounting cavity 1123 to the bottom of the longitudinal beam 114 before filling the gap. And because the gap is small, a large pressure is required when filling the glue, which easily causes the gap to not be filled with glue.

[0064] Based on this, in this embodiment, by sealing the gasket 119 between the first support beam 1125 and the longitudinal beam 114, the isolation between the lower module mounting cavity 1123 and the upper module mounting cavity 1124 can be improved, thereby improving the thermal interference between the lower battery module and the upper battery module.

[0065] In addition, when the longitudinal beam 114 is fixed to the first support beam 1125 by the bolt 1147, the end of the rod of the bolt 1147 passes through the longitudinal beam 114 and the sealing gasket 119 in sequence and is threadedly connected to the first support beam 1125. In this way, the longitudinal beam 114 can be fixed to the first support beam 1125, and the sealing gasket 119 can be clamped between the longitudinal beam 114 and the first support beam 1125 by the locking force of the bolt 1147, so that the sealing between the first support beam 1125 and the longitudinal beam 114 can be improved.

[0066] See also Figure 6 , Figure 6 1 is a schematic diagram of the position of the crossbeam 116 provided in an embodiment of the present application. In one embodiment, the installation cavity further has two second side walls arranged opposite to each other. The two first side walls, the two second side walls and the opposite surfaces between the box cover 111 and the box body 112 define the installation cavity. The battery box 011 also includes two crossbeams 116. The two crossbeams 116 are respectively arranged on the two second side walls. The other two ends of the partition 1131 are overlapped with the two crossbeams 116 respectively.

[0067] It can be understood that the two first side walls and the two second side walls are alternately distributed in sequence along the periphery of the box cover 111. The first side wall is vertically connected to the second side wall, specifically, the two ends of a first side wall are respectively connected to one end of the two second side walls, and the two ends of the other first side wall are respectively connected to the other end of the two second side walls.

[0068] Exemplarily, two ends of the longitudinal beam 114 are respectively in contact with the second side wall of the installation cavity, and two ends of the cross beam 116 are respectively plugged into the two longitudinal beams 114 .

[0069] In addition, the cross beams 116 are all extruded aluminum parts.

[0070] In this embodiment, by providing the cross beam 116, the supporting stability of the battery box 011 on the partition 1131 can be improved, thereby improving the supporting stability of the battery box 011 on the upper battery module, thereby improving the reliability of the battery pack.

[0071] See also Figure 6 In one embodiment, the battery box 011 further includes a reinforcing beam 117, which is disposed between each cross beam 116 and the second side wall where the cross beam 116 is located. Both ends of the reinforcing beam 117 are respectively connected to the cross beam 116 and the second side wall adjacent thereto.

[0072] Exemplarily, the reinforcement beam 117 is parallel to the axis of the longitudinal beam 114 , and the reinforcement beam 117 is welded to the transverse beam 116 and the second side wall adjacent thereto.

[0073] In addition, a plurality of reinforcing beams 117 are disposed between the cross beam 116 and the second side wall adjacent thereto. The plurality of reinforcing beams 117 are disposed along the axis of the cross beam 116 at intervals.

[0074] In this embodiment, by providing the reinforcing beam 117 , the strength of the battery box 011 can be improved, thereby improving the structural reliability of the battery box 011 and further improving the impact resistance of the battery box 011 .

[0075] In one embodiment, the battery box 011 further includes a middle beam 118 , the axis of the middle beam 118 is parallel to the axis of the cross beam 116 , and the middle beam 118 is located between the two cross beams 116 , and both ends of the middle beam 118 are respectively connected to the first side wall.

[0076] Exemplarily, the middle beam 118 is parallel to the axis of the cross beam 116, and the middle beam 118 is connected to the center of the longitudinal beam 114. Specifically, the middle beam 118 and the longitudinal beam 114 are welded.

[0077] In this embodiment, by providing the middle beam 118 , the strength of the battery box 011 can be improved, thereby improving the structural reliability of the battery box 011 and further improving the impact resistance of the battery box 011 .

[0078] See also Figure 3 In one embodiment, a second support beam 1126 is provided on the side of the first side wall close to the bottom guard plate 1121 of the box body 112. The side of the second support beam 1126 close to the box cover 111 is configured to abut against the lower battery module. In this way, a gap can be provided between the lower battery module and the bottom guard plate 1121, and a buffer space required for braking the explosion-proof valve can be formed between the explosion-proof valve and the bottom guard plate 1121, so as to improve the reliability of the battery pack.

[0079] Exemplarily, the second support beam 1126 and the side plate 1122 of the box body 112 are formed by extruded aluminum.

[0080] In this embodiment, the second support beam 1126 is provided to support the lower battery module so that the height of the lower battery module relative to the battery box 011 is determined, thereby improving the position stability of the lower battery module.

[0081] It can be understood that the side wall of the gap between the second support beam 1126 and the bottom guard plate 1121, the side wall of the gap between the lower battery module and the bottom guard plate 1121, the bottom guard plate 1121 and the plastic bracket of the lower battery module enclose the lower pressure relief chamber. The lower pressure relief chamber is vented and depressurized only through the third through hole 11261.

[0082] See also Figure 3 In one embodiment, a lower pressure relief channel 11263 is provided inside the second support beam 1126. A third through hole 11261 is provided on the side of the second support beam 1126 away from the first side wall connected thereto. A fourth through hole 11262 is provided on the side of the second support beam 1126 close to the first side wall where the second support beam 1126 is located. The third through hole 11261 and the fourth through hole 11262 are respectively connected to the lower pressure relief channel 11263. The side plate 1122 of the box body 112 is provided with a lower pressure relief valve installation hole 11222, and the lower pressure relief valve installation hole 11222 is connected to the fourth through hole 11262.

[0083] Exemplarily, a plurality of third through holes 11261 are provided on the second support beam 1126 along the axis of the second support beam 1126 .

[0084] In this embodiment, through the above-mentioned arrangement, when the lower battery module thermally runs away and generates a large amount of gas, the gas can flow from the gap between the lower battery module and the bottom guard plate 1121, the third through hole 11261, the lower pressure relief channel 11263 and the fourth through hole 11262 to the lower pressure relief valve in sequence, so that the gas generated by the battery module is discharged from the battery pack by braking the lower pressure relief valve, thereby improving the safety of the battery pack.

[0085] In addition, the pressure relief paths of the lower module mounting cavity 1123 and the upper module mounting cavity 1124 are independent of each other so that the pressure relief of the lower module mounting cavity 1123 and the upper module mounting cavity 1124 do not interfere with each other, thereby improving the structural safety, thermal safety and reliability of the battery pack.

[0086] In one embodiment, a heat insulation layer 1132 is disposed on one side of the partition 1131 .

[0087] It can be understood that the thermal insulation layer 1132 can be but is not limited to a mica sheet.

[0088] In addition, a heat insulating layer 1132 may be provided on the side of the heat insulating plate facing the upper battery module, or on the side facing the lower battery module, or on both sides of the heat insulating plate.

[0089] Exemplarily, the thickness of the heat insulation layer 1132 is 1 to 3 mm. Specifically, the thickness of the heat insulation layer 1132 can be, but is not limited to, 1 mm, 1.33 mm, 1.6 mm, 1.9 mm, 2 mm, 2.25 mm, 2.8 mm, or 3 mm.

[0090] In this embodiment, by providing a heat insulation layer 1132, the heat transfer rate between the lower module mounting cavity 1123 and the upper module mounting cavity 1124 can be reduced, thereby reducing the thermal interference between the lower module mounting cavity 1123 and the upper module mounting cavity 1124, thereby improving the reliability of the battery pack.

[0091] See also Figure 7 , Figure 7 yes Figure 6 Enlarged view of point C in the middle. In one embodiment, a longitudinal beam 114 bracket is provided on one side of the longitudinal beam 114 close to the box cover 111, and one side of the longitudinal beam 114 bracket is connected to the longitudinal beam 114, and the other side is connected to the first side wall.

[0092] Exemplarily, the longitudinal beam 114 bracket is connected to the longitudinal beam 114 and the first side wall respectively by bolts 1147 .

[0093] In this embodiment, by providing a longitudinal beam 114 bracket, the position stability of the longitudinal beam 114 can be further improved, thereby improving the supporting stability of the longitudinal beam 114 to the upper battery module and the steel plate, thereby improving the reliability of the battery pack.

[0094] See also Figure 8 , Figure 81 is a schematic diagram of the structure of a battery pack 001 provided in an embodiment of the present application. An embodiment of the present application provides a battery pack 001. The battery pack 001 includes an upper battery module 012, a lower battery module and the aforementioned battery box 011. The upper battery module is arranged in the upper module mounting cavity 1124. The lower battery module is arranged in the lower module mounting cavity 1123.

[0095] The partition 1131 is fixedly connected to the lower battery module by structural adhesive, and the heat insulation layer 1132 is bonded to the partition 1131 .

[0096] In addition, both the upper module installation cavity 1124 and the lower module installation cavity 1123 are filled with foam glue.

[0097] Exemplarily, the battery cell of the battery module may be, but is not limited to, a 4680 cylindrical battery cell.

[0098] In this embodiment, by adopting the aforementioned battery box 011, the bracket composed of the longitudinal beam 114 and the partition 1131 can be made into a discrete structure so that it can be manufactured separately, thereby reducing its molding difficulty and further improving the manufacturing efficiency of the battery pack 001.

[0099] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery box, characterized in that: include: Box; A box cover, which is engaged with the box body to define an installation cavity, wherein the installation cavity has two first side walls arranged opposite to each other; two longitudinal beams, respectively disposed on the two first side walls; a partition plate, the two ends of which are respectively overlapped with the two longitudinal beams; The partition divides the installation cavity into a lower module installation cavity and an upper module installation cavity, and the longitudinal beam has a first side surface close to the box cover, and the first side surface is configured to abut against the upper battery module.

2. The battery box according to claim 1, characterized in that: A step groove is arranged on the side of the longitudinal beam away from the first side wall where the longitudinal beam is located. The step groove has a first groove wall parallel to the box cover. Both ends of the partition plate are overlapped with the first groove walls of the two longitudinal beams respectively.

3. The battery box according to claim 2, characterized in that: The step groove also has a second groove wall arranged at an angle to the first groove wall, an upper pressure relief channel is arranged inside the longitudinal beam, a first through hole is arranged on the second groove wall, a second through hole is arranged on the side of the longitudinal beam close to the first side wall where the longitudinal beam is located, the first through hole and the second through hole are respectively connected to the upper pressure relief channel; an upper pressure relief valve mounting hole is arranged on the side plate of the box body, and the upper pressure relief valve mounting hole is connected to the second through hole.

4. The battery box according to claim 1, characterized in that: A support bar is provided on one side of the partition close to the box cover, the axis of the support bar is parallel to the partition, and the side of the support bar close to the box cover is configured to abut against the upper battery module.

5. The battery box according to any one of claims 1 to 4, characterized in that: A first support beam is protruding from the first side wall, and one end of the first support beam close to the box cover is in contact with the longitudinal beam.

6. The battery box according to any one of claims 1 to 4, characterized in that: The installation cavity also has two oppositely arranged second side walls, and the two first side walls, the two second side walls and the opposite surfaces between the box cover and the box body define the installation cavity; the battery box also includes two cross beams, which are respectively arranged on the two second side walls, and the other two ends of the partition are respectively overlapped with the two cross beams.

7. The battery box according to claim 6, characterized in that: The battery box further includes a reinforcing beam, which is disposed between each of the cross beams and the second side wall where the cross beam is located, and two ends of the reinforcing beam are respectively connected to the cross beam and the second side wall adjacent thereto.

8. The battery box according to claim 6, characterized in that: The battery box further includes a middle beam, the axis of which is parallel to the axis of the cross beam and is located between the two cross beams, and both ends of the middle beam are respectively connected to the two first side walls.

9. The battery box according to any one of claims 1 to 4, characterized in that: A second support beam is disposed on the side of the first side wall facing away from the box cover, and a side of the second support beam close to the box cover is configured to abut against the lower battery module.

10. The battery box according to claim 9, characterized in that: A lower pressure relief channel is arranged inside the second support beam, a third through hole is arranged on the side of the second support beam facing away from the first side wall connected thereto, a fourth through hole is arranged on the side of the second support beam close to the first side wall where the second support beam is located, the third through hole and the fourth through hole are respectively communicated with the lower pressure relief channel; a lower pressure relief valve mounting hole is arranged on the side plate of the box body, and the lower pressure relief valve mounting hole is communicated with the fourth through hole.

11. The battery box according to any one of claims 1 to 4, characterized in that: A longitudinal beam bracket is arranged on one side of the longitudinal beam close to the box cover, one side of the longitudinal beam bracket is connected to the longitudinal beam, and the other side of the longitudinal beam bracket is connected to the first side wall.

12. A battery pack, characterized in that: include: The battery box according to any one of claims 1 to 11; An upper battery module is arranged in the upper module installation cavity; The lower battery module is arranged in the lower module installation cavity.

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