Battery lower box body, battery pack and vehicle

Abstract

The utility model discloses a battery lower box body, battery pack and vehicle, battery lower box body includes border, intermediate beam and bottom plate, border surrounds and forms the installation cavity, intermediate beam and border are connected and located in the installation cavity, intermediate beam divides the installation cavity into at least two cavities for holding battery cell module, and the bottom plate is located in the cavity for holding battery cell module. The bottom plates are equal to the cavities in number and correspond to the cavities in a one-to-one mode, and the bottom plates are connected with the frames and the middle beams and seal the lower end openings of the corresponding cavities. The battery lower box body provided by the utility model has the advantages that the manufacturing cost is low, and the formed cavity is high in waterproof sealing reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, and particularly relates to a battery lower box body, a battery pack and a vehicle. Background Art

[0002] The battery lower box body of a battery pack is often formed by extrusion profiles and welding. Among them, the frame and the bottom plate jointly enclose a receiving cavity with an upward opening, and an intermediate beam is arranged inside the frame to divide the receiving cavity into at least two chambers for placing battery cell modules. However, in the related art, the bottom plate on the battery lower box body is usually integrally formed and seals the lower end of the receiving cavity by connecting with the frame. This setting makes the size of the bottom plate large, the manufacturing cost of the bottom plate high, and the middle part of the bottom plate is not restricted, and it is easily deformed by the pressure from the battery cell module, affecting the connection sealing performance with the frame. Content of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems in the related art to a certain extent.

[0004] For this reason, an embodiment of the utility model proposes a battery lower box body, which has the advantages of low manufacturing cost and high waterproof and sealing reliability of the formed chambers.

[0005] An embodiment of the utility model also proposes a battery pack and a vehicle.

[0006] The battery lower box body of the embodiment of the utility model includes a frame, an intermediate beam and a bottom plate. The frame encloses and forms an installation cavity; the intermediate beam is connected with the frame and is located inside the installation cavity, and the intermediate beam divides the installation cavity into at least two chambers for accommodating battery cell modules; the number of the bottom plates is equal to the number of the chambers and corresponds one by one, and each bottom plate is connected with each of the frame and the intermediate beam and closes the lower end opening of the corresponding chamber.

[0007] According to the battery lower box body of the embodiment of the utility model, the frame and the intermediate beam jointly enclose and form at least two chambers, and the number of the bottom plates is equal to the number of the chambers. Each bottom plate is connected with each of the frame and the intermediate beam to close the lower end opening of the corresponding chamber. At this time, compared with the design of the battery lower box body in the related art with only one bottom plate, the size of the bottom plate in this embodiment is smaller, the required die tonnage is smaller, and the manufacturing cost of the bottom plate is lower. Moreover, each bottom plate is also connected with the intermediate beam, and the frame and the intermediate beam jointly support the bottom plate and the battery cell module thereon. Therefore, when the bottom plate is pressed by the battery cell module, the interaction force between the frame and the bottom plate is smaller, the bottom plate is less likely to deform and separate from the frame, affecting the connection sealing performance between the bottom plate and the frame, and the waterproof and sealing reliability of the chamber is higher.

[0008] In some embodiments, the at least two chambers are arranged at intervals along the first direction, the middle beam extends along the second direction, the first direction, the second direction and the height direction are perpendicular to each other, and the two opposite end faces of the middle beam along the first direction are respectively connected to two adjacent base plates.

[0009] In some embodiments, the end surface of the base plate opposite to the first direction is provided with a first protrusion extending along the second direction and one of the first limiting grooves, and the two side surfaces of the middle beam opposite to each other along the first direction are provided with the first protrusion and the other of the first limiting grooves, and the first protrusion is fitted in the first limiting groove.

[0010] In some embodiments, a first cooling channel is provided on the bottom plate, a second cooling channel is provided on the middle beam, and the second cooling channel is connected to the first cooling channel.

[0011] In some embodiments, a water inlet and a water outlet connected to the first cooling channel are provided on the outer peripheral side of the frame.

[0012] In some embodiments, the frame includes a first side beam and a second side beam opposite to each other along the first direction, the bottom surface of each of the first side beam and the second side beam is sealedly connected to the top surface of different base plates, and the top surface of each of the first side beam and the second side beam is provided with a first mounting hole for connecting to a fastener.

[0013] In some embodiments, the frame includes a third side beam and a fourth side beam opposite to each other along the second direction, and opposite end surfaces of the bottom plate along the second direction are respectively sealed and connected to opposite side surfaces of the third side beam and the fourth side beam.

[0014] In some embodiments, the end surface of the base plate opposite to the second direction is provided with a second protrusion extending along the first direction and one of the second limiting grooves, and the side surfaces of the third side beam and the fourth side beam facing the base plate are provided with the second protrusion and the other of the second limiting grooves, and the second protrusion is fitted in the second limiting groove.

[0015] In some embodiments, each of the third side beam and the fourth side beam includes a sealing portion and a connecting portion arranged along the second direction, the connecting portion is located on the side of the sealing portion facing away from the mounting cavity, the top surface of the sealing portion is provided with a second mounting hole for connecting to a fastener, and the side of the connecting portion facing away from the sealing portion is provided with a third mounting hole for connecting to a fastener.

[0016] In some embodiments, the bottom plate includes at least two sub-plates arranged along the second direction, and any two adjacent sub-plates are welded;

[0017] And / or, the first cooling channel includes a plurality of flow paths arranged at intervals along the second direction, and the bottom plate includes partition ribs that separate any two adjacent flow paths from each other.

[0018] In some embodiments, the battery lower box body further includes a PVC coating, and the PVC coating is coated on the bottom surfaces of the bottom plate and the middle beam.

[0019] The battery pack according to an embodiment of the present invention includes the battery lower box body as described in any of the above embodiments.

[0020] The technical advantages of the battery pack according to an embodiment of the present invention are the same as those of the battery lower box body in the above embodiments, and will not be elaborated here.

[0021] The vehicle according to an embodiment of the present invention includes the battery pack as described in the above embodiment.

[0022] The technical advantages of the vehicle according to an embodiment of the present invention are the same as those of the battery pack in the above embodiments, and will not be elaborated here. Description of the Drawings

[0023] Figure 1 It is a schematic diagram of the battery lower box body according to an embodiment of the present invention.

[0024] Figure 2 It is another schematic diagram of the battery lower box body according to an embodiment of the present invention.

[0025] Figure 3 It is a schematic diagram of the first side beam in the battery lower box body according to an embodiment of the present invention.

[0026] Figure 4 It is a schematic diagram of the second side beam in the battery lower box body according to an embodiment of the present invention.

[0027] Figure 5 It is a schematic diagram of the third side beam in the battery lower box body according to an embodiment of the present invention.

[0028] Figure 6 It is a schematic diagram of the middle beam in the battery lower box body according to an embodiment of the present invention.

[0029] Figure 7 It is a schematic diagram of the bottom plate in the battery lower box body according to an embodiment of the present invention.

[0030] Figure 8 It is a cross-sectional view of the partition plate in the battery lower box body according to an embodiment of the present invention.

[0031] Figure 9 It is a schematic diagram of the plugging block in the battery lower box body according to an embodiment of the present invention.

[0032] Reference Signs:

[0033] 1. Frame; 11. First side beam; 111. First mounting hole; 12. Second side beam; 13. Third side beam; 131. Sealing part; 1311. Second mounting hole; 1312. Second limiting groove; 132. Connecting part; 1321. Third mounting hole; 14. Fourth side beam; 2. Intermediate beam; 21. Second cooling flow channel; 22. First rib; 3. Bottom plate; 31. Sub-plate; 311. Second rib; 312. Partition rib; 313. First cooling flow channel; 4. Water inlet nozzle; 5. Water outlet nozzle; 6. Plugging block; 7. PVC coating. Detailed Embodiment

[0034] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0035] Below in conjunction with Figures 1 - 9 Describe the battery lower box body according to the embodiment of the present utility model.

[0036] The battery lower box body of the embodiment of the present utility model includes a frame 1, an intermediate beam 2 and a bottom plate 3. An installation cavity is formed around the frame 1. The intermediate beam 2 is connected to the frame 1 and is located in the installation cavity. The intermediate beam 2 divides the installation cavity to form at least two chambers for accommodating battery cell modules. The number of the bottom plates 3 is equal to the number of the chambers and corresponds one by one. The bottom plates 3 are connected to each of the frame 1 and the intermediate beam 2 and close the lower openings of the corresponding chambers.

[0037] For the battery lower box body according to the embodiment of the present utility model, the frame 1 and the intermediate beam 2 are provided to jointly form at least two chambers, and the number of the bottom plates 3 is equal to the number of the chambers. Each bottom plate 3 is connected to each of the frame 1 and the intermediate beam 2 to close the lower opening of the corresponding chamber. At this time, compared with the design of the battery lower box body in the related art with only one bottom plate 3, the size of the bottom plate 3 in this embodiment is smaller, the required die tonnage is smaller, and the manufacturing cost of the bottom plate 3 is lower. Moreover, each bottom plate 3 is also connected to the intermediate beam 2. The frame 1 and the intermediate beam 2 jointly support the bottom plate 3 and the battery cell modules thereon. Therefore, when the bottom plate 3 is pressed by the battery cell modules, the mutual acting force between the frame 1 and the bottom plate 3 is smaller, the bottom plate 3 is less likely to be deformed and separated from the frame 1, which affects the connection sealing performance between the bottom plate 3 and the frame 1, and the waterproof sealing reliability of the chamber is higher.

[0038] It should be noted that the number of the intermediate beams 2 can be one, and the number of the formed chambers is two. The size of the bottom plate 3 is approximately half of the size of the bottom plate 3 in the related art.

[0039] For the convenience of understanding,Figure 1 The direction indicated by arrow A is the first direction of the lower battery box according to the embodiment of the present utility model, Figure 1 and the direction indicated by arrow B is the second direction of the lower battery box according to the embodiment of the present utility model. The first direction is the length direction of the battery pack, and the second direction is the width direction of the battery pack.

[0040] In some embodiments, as Figure 1 shown, at least two chambers are arranged at intervals along the first direction, the intermediate beam 2 extends along the second direction, the first direction, the second direction and the height direction are perpendicular to each other in pairs, and the two end faces of the intermediate beam 2 along the first direction are respectively connected to two adjacent bottom plates 3.

[0041] That is, the intermediate beam 2 and all the bottom plates 3 together realize the closing of the lower end opening of the accommodation chamber. Therefore, the sum of the sizes of all the bottom plates 3 is still smaller than the size of the bottom plate 3 in the related art. Furthermore, the size of the bottom plate 3 in this embodiment is smaller and the manufacturing cost is lower.

[0042] Specifically, the two bottom plates 3 have the same size, and the end faces of the bottom plate 3 along the first direction are in fitting contact with the end faces of the intermediate beam 2 along the first direction and are welded. The bottom surface of the bottom plate 3 and the bottom surface of the intermediate beam 2 are coplanar.

[0043] In some embodiments, as Figure 6 shown, one of the first convex strip 22 and the first limiting groove extending along the second direction is provided on the end faces of the bottom plate 3 along the first direction, and the other of the first convex strip 22 and the first limiting groove is provided on the two side faces of the intermediate beam 2 along the first direction, and the first convex strip 22 is fitted in the first limiting groove.

[0044] The cooperation between the first convex strip 22 and the first limiting groove effectively ensures the relative fixation of the bottom plate 3 and the intermediate beam 2 in the height direction. Therefore, the contact area between the bottom plate 3 and the intermediate beam 2 is larger, the connection sealing performance between the two is higher, and further the waterproof sealing performance of the chamber is better.

[0045] Specifically, the sizes of the first convex strip 22, the first limiting groove and the bottom plate 3 in the second direction are all equal.

[0046] In some embodiments, as Figure 6 and Figure 8 shown, a first cooling flow channel 313 is provided on the bottom plate 3, and a second cooling flow channel 21 is provided on the intermediate beam 2, and the second cooling flow channel 21 is communicated with the first cooling flow channel 313.

[0047] The first cooling channels 313 on multiple base plates 3 are interconnected through the second cooling channels 21 to form a complete interconnected flow path. At this time, the flow of the coolant in the second cooling channels 21 and all the first cooling channels 313 can be achieved only through one water inlet hole and one water outlet hole. Moreover, at this time, the base plate 3 and the intermediate beam 2 jointly dissipate heat from the battery cell module, and there is no need to separately arrange a liquid cooling plate in the chamber, thus making the weight of the battery lower box lighter and the manufacturing cost lower.

[0048] Specifically, a first interface is provided on the end face of the base plate 3 facing the intermediate beam 2, and a second interface is provided on the end face of the intermediate beam 2 facing the base plate 3. After the base plate 3 and the intermediate beam 2 are spliced and connected, the first interface and the second interface are communicated.

[0049] In some embodiments, a water inlet nozzle 4 and a water outlet nozzle 5 communicated with the first cooling channels 313 are provided on the outer peripheral side of the frame 1.

[0050] By installing the water inlet nozzle 4 and the water outlet nozzle 5 on the outer peripheral side of the frame 1, the external liquid cooling system realizes communication with the first cooling channels 313 and the second cooling channels 21 through the water inlet nozzle 4 and the water outlet nozzle 5. Compared with setting the water inlet nozzle 4 and the water outlet nozzle 5 above or below the frame 1, the size of the battery lower box in the height direction is smaller at this time, the occupied height space of the vehicle is smaller, and the space utilization rate of the vehicle in the height direction is higher.

[0051] Specifically, as Figure 1 and Figure 9 shown, the frame 1 includes a first side beam 11. Two blocking blocks 6 are welded on the first side beam 11. The blocking blocks 6 form through holes communicating the chamber and the outside. The water inlet nozzle 4 and the water outlet nozzle 5 are formed by an extrusion process and are respectively connected to the two blocking blocks 6 through welding or bonding to be respectively communicated with the two through holes.

[0052] In some embodiments, as Figure 1 、 Figure 3 and Figure 4 shown, the frame 1 includes a first side beam 11 and a second side beam 12 opposite to each other in the first direction. The bottom surface of each of the first side beam 11 and the second side beam 12 is hermetically connected to the top surface of a different base plate 3. A first mounting hole 111 for connecting with a fastener is provided on the top surface of each of the first side beam 11 and the second side beam 12.

[0053] By hermetically connecting the bottom surface of each of the first side beam 11 and the second side beam 12 to the top surface of a different base plate 3, the inner side surfaces of the first side beam 11 and the second side beam 12 are hermetically connected to the top surface of the base plate 3, so that there is no need to consider the connection sealing requirements between the fastener and the first mounting hole 111, and the design difficulty of the first side beam 11 and the second side beam 12 is lower.

[0054] Specifically, the first side beam 11 and the second side beam 12 are respectively the front cross beam and the rear cross beam, and the bottom surfaces of the first side beam 11 and the second side beam 12 are connected to the top surfaces of different bottom plates 3 by friction stir welding. In addition, as Figure 3 shown, the first side beam 11 includes a connected vertical plate and a horizontal plate. The horizontal plate is located on the side of the vertical plate facing the middle beam 2. The bottom surface of the horizontal plate is higher than the bottom surface of the vertical plate. The top surface of the bottom plate 3 is attached to and friction stir welded with the bottom surface of the horizontal plate, and the end surface of the bottom plate 3 facing the vertical plate is adhesively bonded to the vertical plate.

[0055] In addition, both the first side beam 11 and the second side beam 12 are formed by an extrusion process. The fastener is a blind rivet nut, and the blind rivet nut is fixed on the first mounting hole 111. As Figure 3 and Figure 4 shown, the bottom surfaces of the top plates of the first side beam 11 and the second side beam 12 provided with the first mounting holes 111 are in communication with the outside, so that it is convenient to clean the aluminum chips when processing the blind rivet nuts, and avoid the accumulation or retention of aluminum chips in the sealed cavity.

[0056] In some embodiments, as Figure 1 and Figure 5 shown, the frame 1 includes a third side beam 13 and a fourth side beam 14 opposite to each other in the second direction. The opposite end surfaces of the bottom plate 3 in the second direction are respectively and hermetically connected to the opposite side surfaces of the third side beam 13 and the fourth side beam 14.

[0057] That is, the bottom plate 3 is connected between the third side beam 13 and the fourth side beam 14, and the frame 1 realizes the limitation of the bottom plate 3 in the second direction, thereby making the connection strength between each of the third side beam 13 and the fourth side beam 14 and the bottom plate 3 higher, and the connection sealing reliability higher.

[0058] Specifically, the third side beam 13 and the fourth side beam 14 are arranged in mirror symmetry. The opposite end surfaces of each of the first side beam 11 and the second side beam 12 in the second direction are respectively attached to and connected to the inner side surfaces of the third side beam 13 and the fourth side beam 14 by friction stir welding, thereby ensuring the sealing reliability of the formed chamber.

[0059] In some embodiments, as Figure 5 、 Figure 7 and Figure 8 shown, one of the second rib 311 and the second limiting groove 1312 extending in the first direction is provided on the opposite end surfaces of the bottom plate 3 in the second direction, and the other of the second rib 311 and the second limiting groove 1312 is provided on the side surfaces of the third side beam 13 and the fourth side beam 14 facing the bottom plate 3, and the second rib 311 is fitted in the second limiting groove 1312.

[0060] The cooperation between the second protrusion 311 and the second limiting groove 1312 further ensures that each of the third side beam 13 and the fourth side beam 14 is relatively fixed to the bottom plate 3 in the height direction. At the same time, the contact area between each of the third side beam 13 and the fourth side beam 14 and the bottom plate 3 is increased, and the connection sealing between the two is higher.

[0061] Specifically, the second convex strip 311 is arranged on the base plate 3, and the length of the second convex strip 311 is equal to the size of the base plate 3 in the first direction. The second limiting groove 1312 is arranged on the third side beam 13 and the fourth side beam 14, and the length of the second limiting groove 1312 is equal to the length of the third side beam 13 and the fourth side beam 14.

[0062] In some embodiments, Figure 5 As shown, each of the third side beam 13 and the fourth side beam 14 includes a sealing portion 131 and a connecting portion 132 arranged along the second direction, the connecting portion 132 is located on the side of the sealing portion 131 away from the mounting cavity, the top surface of the sealing portion 131 is provided with a second mounting hole 1311 for connecting to a fastener, and the side of the connecting portion 132 away from the sealing portion 131 is provided with a third mounting hole 1321 for connecting to a fastener.

[0063] On the basis that the side of the sealing portion 131 facing away from the connecting portion 132 is sealed and connected to the top surface of the bottom plate 3, there is no need to perform sealing treatment at the second mounting hole 1311 and the third mounting hole 1321, thereby reducing the design difficulty of the third side beam 13 and the fourth side beam 14.

[0064] Specifically, the third side beam 13 and the fourth side beam 14 are both formed by an extrusion process and are respectively the left longitudinal beam and the right longitudinal beam. There are multiple sealing portions 131 and they are arranged at intervals along the first direction. Each of the third side beam 13 and the fourth side beam 14 is connected to the side component of the battery pack through a connecting portion 132, and is connected to the upper component of the battery pack through a fastener above the sealing portion 131, and the fastener can be a rivet nut.

[0065] In some embodiments, the bottom plate 3 includes at least two sub-plates 31 arranged along the second direction, and any two adjacent sub-plates 31 are welded, thereby making the size of the sub-plates 31 smaller, the manufacturing cost of the sub-plates 31 lower, and thus the manufacturing cost of the battery lower box lower.

[0066] Specifically, Figure 7 As shown, a base plate 3 includes two sub-plates 31, and the two sub-plates 31 are welded.

[0067] and / or, if Figure 8 As shown, the first cooling channel 313 includes a plurality of flow paths arranged at intervals along the second direction, and the bottom plate 3 includes partition ribs 312 separating any two adjacent flow paths.

[0068] That is, a plurality of partition ribs 312 arranged at intervals in the second direction are provided in the bottom plate 3, and the plurality of partition ribs 312 further improve the support strength of the bottom plate 3. At the same time, in the face of working conditions such as bottom ball impacts, certain collapse spaces are formed in each flow path, which can effectively resist harsh working conditions such as bottom impacts.

[0069] In some embodiments, the battery lower box body further includes a PVC (Polyvinyl chloride) coating, and the PVC coating 7 is coated on the bottom surfaces of the bottom plate 3 and the middle beam 2.

[0070] The setting of the PVC coating 7 can prevent small stones or other small foreign objects from patting the bottom plate 3 during driving, avoid paint peeling or pits on the electrophoresis layer on the bottom plate 3, and also effectively improve the corrosion resistance of the bottom plate 3. Moreover, its strength is relatively small, effectively avoiding abnormal noises when small stones or other small foreign objects impact the bottom plate 3, and improving the user experience.

[0071] Specifically, the PVC coating 7 is sprayed on the outer surface of the bottom plate 3 manually or by a robotic arm, and then baked in an oven to facilitate the curing of the PVC coating 7 on the bottom plate 3 to ensure that the PVC coating 7 has a certain adhesion on the bottom plate 3.

[0072] The battery pack according to an embodiment of the present invention includes the battery lower box body as described in any of the above embodiments.

[0073] The technical advantages of the battery pack according to an embodiment of the present invention are the same as those of the battery lower box body in the above embodiments, and will not be elaborated here.

[0074] The vehicle according to an embodiment of the present invention includes the battery pack as described in the above embodiments.

[0075] The technical advantages of the vehicle according to an embodiment of the present invention are the same as those of the battery pack in the above embodiments, and will not be elaborated here.

[0076] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0077] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0078] In the present utility model, unless otherwise clearly stipulated and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0079] In the present utility model, unless otherwise clearly stipulated and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0080] In the present utility model, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0081] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present utility model.

Claims

1. A battery lower box, characterized in that: include: A frame, wherein the frame is formed around a mounting cavity; A middle beam, the middle beam is connected to the frame and is located in the installation cavity, and the middle beam divides the installation cavity into at least two chambers for accommodating power supply core modules; A bottom plate, the number of which is equal to and corresponds to the number of the chambers, and the bottom plate is connected to each of the frame and the middle beam and closes the lower end opening of the corresponding chamber.

2. The battery lower box according to claim 1, characterized in that: The at least two chambers are arranged at intervals along the first direction, the middle beam extends along the second direction, the first direction, the second direction and the height direction are perpendicular to each other, and the two opposite end faces of the middle beam along the first direction are respectively connected to two adjacent bottom plates.

3. The battery lower box according to claim 2, characterized in that: The end surface of the bottom plate opposite to the first direction is provided with a first protrusion extending along the second direction and one of the first limiting grooves, and the two side surfaces of the middle beam opposite to each other along the first direction are provided with the first protrusion and the other of the first limiting grooves, and the first protrusion is fitted in the first limiting groove.

4. The battery lower box according to claim 2, characterized in that: The bottom plate is provided with a first cooling channel, the middle beam is provided with a second cooling channel, and the second cooling channel is communicated with the first cooling channel.

5. The battery lower box according to claim 4, characterized in that: A water inlet and a water outlet communicated with the first cooling channel are provided on the outer peripheral side of the frame.

6. The battery lower box according to claim 2, characterized in that: The frame includes a first side beam and a second side beam opposite to each other along the first direction, the bottom surface of each of the first side beam and the second side beam is sealed and connected to the top surface of different bottom plates, and the top surface of each of the first side beam and the second side beam is provided with a first mounting hole for connecting to a fastener.

7. The battery lower box according to claim 2, characterized in that: The frame includes a third side beam and a fourth side beam opposite to each other along the second direction, and opposite end surfaces of the bottom plate along the second direction are respectively sealed and connected to opposite side surfaces of the third side beam and the fourth side beam.

8. The battery lower box according to claim 7, characterized in that: The end surface of the base plate opposite to the second direction is provided with a second protrusion and one of the second limiting grooves extending along the first direction, and the side surfaces of the third side beam and the fourth side beam facing the base plate are provided with the second protrusion and the other of the second limiting grooves, and the second protrusion is fitted in the second limiting groove.

9. The battery lower box according to claim 8, characterized in that: Each of the third side beam and the fourth side beam includes a sealing portion and a connecting portion arranged along the second direction, the connecting portion is located on a side of the sealing portion away from the mounting cavity, a second mounting hole for connecting to a fastener is provided on a top surface of the sealing portion, and a third mounting hole for connecting to a fastener is provided on a side of the connecting portion away from the sealing portion.

10. The battery lower box according to claim 4, characterized in that: The bottom plate comprises at least two sub-plates arranged along the second direction, and any two adjacent sub-plates are welded; And / or, the first cooling flow channel includes a plurality of flow paths arranged at intervals along the second direction, and the bottom plate includes partition ribs separating any two adjacent flow paths.

11. The battery lower box according to claim 2, characterized in that: The battery lower box also includes a PVC coating, and the PVC coating is coated on the bottom surface of the bottom plate and the middle beam.

12. A battery pack, characterized in that: It comprises a battery lower box according to any one of claims 1-11.

13. A vehicle, characterized in that: Comprising the battery pack according to claim 12.

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