Battery pack and vehicle

Abstract

A battery pack (100) and a vehicle. The battery pack (100) comprises: a battery module (10), the battery module (10) comprising a plurality of battery cells (11); and a bottom plate assembly (20), wherein the battery module (10) is arranged on the bottom plate assembly (20), the bottom plate assembly (20) comprises a first layer plate (21) and a second layer plate (22) which are spaced apart from each other, the first layer plate (21) is located on the side of the second layer plate (22) close to the battery module (10), a plurality of recesses (211) recessed towards the second layer plate (22) are formed in the first layer plate (21), and two side walls of each recess (211) are respectively opposite to two adjacent battery cells (11). According to the battery pack (100), the bottom plate assembly (20) has high structural strength, and can ensure the use safety.

Description

Battery packs and vehicles

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application with application number CN202322665810.6 and title “Battery Pack and Vehicle” filed with the China Patent Office on September 28, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery technology, and more particularly, to a battery pack and a vehicle. Background Art

[0004] With increasing attention paid to safety performance and energy, the safety performance of battery packs has become increasingly important. In related technologies, battery packs provide poor protection for battery cells, making them prone to safety hazards and other problems.

[0005] Application Contents

[0006] In view of this, one object of the present application is to provide a battery pack, wherein the bottom plate assembly of the battery pack has high structural strength and can ensure safety in use.

[0007] In the first aspect, the present application provides a battery pack, comprising: a battery module, the battery module comprising a plurality of battery cells; a base plate assembly, the battery module being arranged on the base plate assembly, the base plate assembly comprising a first layer plate and a second layer plate arranged at intervals, the first layer plate being located on a side of the second layer plate close to the battery module, the first layer plate being provided with a plurality of recessed portions recessed toward the second layer plate, the two side walls of each recessed portion being respectively opposite to two adjacent battery cells.

[0008] Beneficial effects: The bottom plate assembly includes a first layer plate and a second layer plate arranged at intervals. The first layer plate of the bottom plate assembly is located on the side of the second layer plate close to the battery module. The first layer plate is provided with multiple recessed portions recessed toward the second layer plate. The two side walls of each recessed portion are respectively opposite to two adjacent battery cells, so that the recessed portions can avoid the extrusion force on the right-angle surface of the battery cell, avoiding safety hazards caused by mutual squeezing between the battery cell and the first layer plate. The bottom plate assembly has high structural strength, which is convenient for protecting the battery module and ensuring the safety of battery pack use.

[0009] In an optional embodiment, the bottom plate assembly further includes: a plurality of connecting ribs, each of the plurality of connecting ribs being located between the first layer plate and the second layer plate, and the plurality of connecting ribs respectively connecting the second layer plate and the plurality of recessed portions.

[0010] In an optional embodiment, the base plate assembly is provided with a plurality of avoidance holes arranged at intervals.

[0011] In an optional embodiment, each of the battery cells is provided with an explosion-proof valve, which is arranged on a side of the battery cell facing the bottom plate assembly, and a plurality of the explosion-proof valves respectively extend into a plurality of the avoidance holes.

[0012] In an optional embodiment, the first layer plate is an integral part; or, the first layer plate includes a layer plate body and a structural member, the layer plate body is located on the side of the second layer plate close to the battery module, the structural member is arranged between the battery module and the layer plate body, and the recessed portion is provided on the structural member.

[0013] In an optional embodiment, a plurality of reinforcing ribs are arranged at intervals between the layer plate body and the second layer plate, the two ends of the plurality of reinforcing ribs in the height direction are respectively connected to the layer plate body and the second layer plate, and the plurality of reinforcing ribs are respectively located between two adjacent battery cells.

[0014] In an optional embodiment, a plurality of the reinforcing ribs are arranged along the width direction of the battery cell, and an end of each of the reinforcing ribs away from the battery cell extends obliquely toward one side in the width direction of the battery cell.

[0015] In an optional embodiment, a cooling channel is defined between two adjacent reinforcing ribs, the layer plate body and the second layer plate; or a buffer is provided between two adjacent reinforcing ribs, the layer plate body and the second layer plate.

[0016] In an optional embodiment, a heat conductor is provided between the battery module and the base plate assembly.

[0017] In a second aspect, the present application also provides a vehicle comprising a battery pack according to any one of the above technical solutions.

[0018] Beneficial effects: Since the vehicle includes the above-mentioned battery pack, it has all the beneficial effects of the battery pack, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] FIG1 is a schematic structural diagram of a battery pack according to a first embodiment of the present application;

[0021] FIG2 is a schematic diagram of a partial structure of a battery pack according to the first embodiment of the present application;

[0022] FIG3 is a schematic structural diagram of a bottom plate assembly of a battery pack according to a second embodiment of the present application;

[0023] FIG4 is a top view of a bottom plate assembly of a battery pack according to a second embodiment of the present application;

[0024] FIG5 is a cross-sectional view of FIG4 taken along line AA;

[0025] FIG6 is a schematic structural diagram of a bottom plate assembly of a battery pack according to a third embodiment of the present application;

[0026] FIG7 is a cross-sectional view taken along line BB in FIG6;

[0027] FIG8 is a schematic structural diagram of a bottom plate assembly of a battery pack according to a fourth embodiment of the present application;

[0028] FIG9 is a cross-sectional view taken along line CC in FIG8 ;

[0029] FIG10 is a top view of a bottom plate assembly of a battery pack according to a fourth embodiment of the present application;

[0030] FIG11 is a cross-sectional view of FIG10 along line DD.

[0031] Description of reference numerals:

[0032] 100-battery pack;

[0033] 10-battery module; 11-battery cell; 111-electrode;

[0034] 20 - bottom plate assembly; 21 - first layer plate; 22 - second layer plate; 23 - connecting ribs; 24 - avoidance hole; 211 - recessed portion;

[0035] 31-layer plate body; 32-structural member; 33-reinforcement rib; 321-substructure;

[0036] 41- bottom guard plate; 42- upper cover; 43- box body; 411- exhaust duct. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are 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 making creative efforts shall fall within the scope of protection of this application.

[0038] The battery pack 100 according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0039] 1-5 , a battery pack 100 according to an embodiment of the present application may include: a battery module 10 and a base plate assembly 20 .

[0040] Specifically, the battery module 10 includes a plurality of (greater than or equal to two) battery cells 11 . The battery module 10 is disposed on a base plate assembly 20 . The base plate assembly 20 can support the plurality of battery cells 11 , thereby meeting the support requirements for the battery module 10 .

[0041] In addition, as shown in Figures 1 to 5, the bottom plate assembly 20 includes a first layer plate 21 and a second layer plate 22 that are spaced apart. The first layer plate 21 is located on the side of the second layer plate 22 close to the battery module 10 (for example, the upper side shown in Figure 1). The first layer plate 21 and the second layer plate 22 are advantageously used to improve the structural strength of the bottom plate assembly 20 and facilitate protection of the battery module 10.

[0042] At the same time, as shown in Figures 2 to 5, a plurality of (greater than or equal to two) recessed portions 211 are provided on the first layer 21, and the plurality of recessed portions 211 are recessed toward the second layer 22. The two side walls of each recessed portion 211 are respectively opposite to the two adjacent battery cells 11, so that the right-angled surface of the battery cell 11 can be located on the upper side of the recessed portion 211. The recessed portion 211 can avoid the squeezing force on the right-angled surface of the battery cell 11, and avoid the safety hazards caused by the mutual squeezing between the battery cell 11 and the first layer 21, thereby ensuring the safety of the battery pack 100. The battery pack 100 has a compact structure, light weight, simple manufacturing process, and low production cost, which can greatly shorten the performance verification cycle of the battery pack 100.

[0043] In the embodiment of the present application, the specific shape of the recessed portion 211 can be flexibly set according to actual conditions. For example, the recessed portion 211 can be formed into a "trapezoidal" groove as shown in FIG. 2 , or the recessed portion 211 can be formed into a "V-shaped" groove as shown in FIG. 3 .

[0044] It should be noted that, for the convenience of description, the directions such as "front", "back", "up" and "down" in this application are based on the direction relationships shown in the accompanying drawings, and are not limitations on the directions in actual application.

[0045] In some embodiments, as shown in Figure 2, multiple recessed portions 211 can be arranged along the width direction (front-to-back direction) of the battery cell 11, so that the right-angled surface at the large surface of the battery cell 11 can be located on the upper side of the recessed portion 211. The recessed portion 211 can avoid the extrusion force on the right-angled surface at the large surface of the battery cell 11, and can further avoid the battery cell 11 and the first layer plate 21 from squeezing each other to cause safety hazards and other problems, so that the avoidance effect is good, which is beneficial to improving the safety of the battery pack 100.

[0046] In some embodiments, the multiple battery cells 11 can be connected to the base plate assembly 20 by adhesive, which can ensure that the multiple battery cells 11 are securely fixed on the base plate assembly 20, avoid problems such as movement, and ensure the safety of the battery pack 100.

[0047] According to the battery pack 100 of the embodiment of the present application, the bottom plate assembly 20 includes a first layer plate 21 and a second layer plate 22 arranged at intervals. The first layer plate 21 of the bottom plate assembly 20 is located on the side of the second layer plate 22 close to the battery module 10. The first layer plate 21 is provided with a plurality of recessed portions 211 recessed toward the second layer plate 22. The two side walls of each recessed portion 211 are respectively opposite to two adjacent battery cells 11, so that the recessed portion 211 can avoid the extrusion force on the right-angle surface of the battery cell 11, avoiding the safety hazards caused by the mutual extrusion between the battery cell 11 and the first layer plate 21. In addition, the structural strength of the bottom plate assembly 20 is high, which is convenient for protecting the battery module 10 and ensuring the safety of the battery pack 100.

[0048] In some embodiments of the present application, as shown in FIG5 , the bottom plate assembly 20 further includes a plurality of (greater than or equal to two) connecting ribs 23, each of which is located between the first layer 21 and the second layer 22, and the plurality of connecting ribs 23 respectively connect the second layer 22 and the plurality of recessed portions 211. Thus, the connection between the first layer 21 and the second layer 22 can be achieved through the connecting ribs 23, ensuring a reliable connection between the first layer 21 and the second layer 22, which is beneficial to improving the structural strength of the bottom plate assembly 20 and ensuring reliable protection for the battery cells 11. Furthermore, it can avoid the need to increase the space occupied by the recessed portion 211 due to direct connection with the second layer 22, thereby ensuring the structural strength of the bottom plate assembly 20, making the structure of the battery pack 100 compact, and helping to reduce the occupied space.

[0049] According to some embodiments of the present application, as shown in Figures 1 to 4, 6, 8 and 10, a plurality of (greater than or equal to two) spaced-apart avoidance holes 24 are provided on the bottom plate assembly 20. The avoidance holes 24 can reduce the overall weight of the bottom plate assembly 20, thereby reducing the weight of the battery pack 100. The manufacturing process is simple, which is conducive to reducing the production cost of the bottom plate assembly 20.

[0050] In some embodiments of the present application, each battery cell 11 is provided with an explosion-proof valve. When thermal runaway occurs in the battery cell 11, the explosion-proof valve can depressurize and exhaust the battery cell 11, thereby releasing the internal pressure of the battery cell 11 and ensuring the safety of the battery cell 11.

[0051] In addition, explosion-proof valves are provided on the side of the battery cell 11 facing the base plate assembly 20 (e.g., the lower side as shown in FIG1 ). Multiple explosion-proof valves extend into multiple escape holes 24 . These escape holes 24 allow for the explosion-proof valves to escape, facilitating placement of the battery cell 11 on the base plate assembly 20 and meeting required placement requirements. Furthermore, gases discharged from the battery cell 11 can be discharged through the channel between the first and second layers 21 and 22 , making gas discharge more reliable and facilitating the safe use of the battery pack 100. Furthermore, the recessed portion 211 mitigates the compressive forces exerted on the right-angled surfaces of the battery cell 11, preventing deformation of the escape holes 24 caused by compression between the battery cell 11 and the first layer 21. This ensures reliable gas discharge from the battery cell 11 and the safe use of the battery pack 100.

[0052] In some embodiments, as shown in Figures 1 and 2, each battery cell 11 is provided with a terminal post 111 to meet the connection requirements of the battery cell 11. Furthermore, the terminal post 111 and the explosion-proof valve can be located on opposite sides, for example, the terminal post 111 can be located on the upper side of the battery cell 11 and the explosion-proof valve can be located on the lower side of the battery cell 11. This can improve the energy density of the entire battery pack 100 and prevent thermal runaway of the battery cell 11. Alternatively, the terminal post 111 and the explosion-proof valve can be located on the same side, for example, the terminal post 111 and the explosion-proof valve can be located on the upper side of the battery cell 11, which can meet the different connection and usage requirements of the battery cell 11.

[0053] It is understandable that there are two poles 111 , and the two poles 111 can be located on the same side of the battery cell 11 or on opposite sides of the battery cell 11 .

[0054] According to some embodiments of the present application, as shown in FIG3-FIG5 , the first layer of plate 21 is an integral piece, so that the first layer of plate 21 is easy to manufacture and has high connection strength, which is conducive to improving production efficiency.

[0055] Alternatively, as shown in FIG2 , the first layer plate 21 may include a layer plate body 31 and a structural member 32 . The layer plate body 31 is located on a side of the second layer plate 22 that is closer to the battery module 10 (e.g., the upper side shown in FIG1 ). The structural member 32 is disposed between the battery module 10 and the layer plate body 31 . The structural member 32 is provided with a recessed portion 211 , which can improve the structural strength of the first layer plate 21 and improve the integrity of the first layer plate 21 , thereby ensuring good protection for the battery cells 11 . For example, the structural member 32 may be a structural adhesive or the like.

[0056] In some embodiments, as shown in Figure 2, the structural member 32 may include multiple (greater than or equal to two) sub-structure parts 321, and the multiple sub-structure parts 321 are arranged at intervals on the layer plate body 31. Each sub-structure part 321 is provided with multiple recessed parts 211, which makes the structure of the structural member 32 simple, can reduce the use of materials, reduce the overall weight of the battery pack 100, and help reduce production costs.

[0057] In some embodiments of the present application, as shown in Figures 6 to 11, a plurality of (greater than or equal to two) reinforcing ribs 33 are provided between the layer plate body 31 and the second layer plate 22, and the two ends of the plurality of reinforcing ribs 33 in the height direction (for example, the up and down direction shown in Figure 1) are respectively connected to the layer plate body 31 and the second layer plate 22. The reinforcing ribs 33 can be used to connect the first layer plate 21 and the second layer plate 22, ensuring that the first layer plate 21 and the second layer plate 22 are reliably connected, which is beneficial to improving the structural strength of the bottom plate assembly 20, ensuring reliable protection of the battery cell 11, and meeting the vibration performance of the battery pack 100 and the safety protection requirements of the battery cell 11.

[0058] In addition, multiple reinforcing ribs 33 are respectively located between two adjacent battery cells 11, so that the reinforcing ribs 33 can avoid the battery cells 11, avoiding problems such as the reinforcing ribs 33 and the battery cells 11 being squeezed and causing damage to the battery cells 11, thereby ensuring the safety of the battery pack 100.

[0059] In some embodiments, as shown in FIG1 , a battery pack 100 includes a housing 43 connected to the base plate assembly 20 and disposed around the battery module 10. The housing 43 serves to position the battery module 10, ensuring that it is securely positioned within the base plate assembly 20. Furthermore, the battery pack 100 eliminates the need for crossbeams and longitudinal beams typically found in related art, thereby increasing the energy density of the battery pack 100 and meeting its operational requirements. Furthermore, reinforcing ribs 33 enhance the structural strength of the base plate assembly 20, thereby meeting the vibration performance requirements of the battery pack 100 and the safety protection requirements of the battery cells 11. For example, the housing 43 and base plate assembly 20 are connected by welding, ensuring a secure connection and reducing production costs.

[0060] In some embodiments, as shown in FIG1 , the battery pack 100 further includes a bottom guard plate 41 . The bottom guard plate 41 is located on a side of the bottom plate assembly 20 away from the battery module 10 (e.g., the lower side as shown in FIG1 ), and is connected to the housing 43 and the bottom plate assembly 20 to ensure that the bottom guard plate 41 is securely fixed. The bottom guard plate 41 can further protect the battery cells 11, ensuring reliable protection of the battery cells 11. For example, the bottom guard plate 41 is connected to the housing 43 by fasteners, and the bottom guard plate 41 is connected to the bottom plate assembly 20 by bonding to ensure a reliable connection.

[0061] In some embodiments in which a plurality of spaced-apart avoidance holes 24 are provided on the bottom plate assembly 20, as shown in FIG1 , a plurality of (greater than or equal to two) exhaust channels 411 are provided on one side of the bottom guard plate 41 facing the bottom plate assembly 20 (for example, the upper side shown in FIG1 ). The plurality of exhaust channels 411 are opposite to the plurality of avoidance holes 24, so that the gas discharged from the battery cells 11 through the avoidance holes 24 can be discharged from the exhaust channels 411, making the gas discharge more reliable and helping to ensure the safety of the battery pack 100.

[0062] In some embodiments, as shown in FIG1 , the battery pack 100 further includes an upper cover 42 , which is located on a side of the battery module 10 away from the bottom plate assembly 20 (e.g., the upper side as shown in FIG1 ). The upper cover 42 is connected to the housing 43 . The upper cover 42 protects the battery module 10 and ensures reliable protection of the battery module 10 . For example, the upper cover 42 and the housing 43 are connected by fasteners to ensure a reliable connection and facilitate disassembly.

[0063] According to some embodiments of the present application, as shown in Figures 6 to 11, a plurality of reinforcing ribs 33 are arranged along the width direction of the battery cell 11, and the end of each reinforcing rib 33 away from the battery cell 11 (for example, the lower end shown in Figure 1) is inclined and extends toward one side in the width direction of the battery cell 11. Therefore, when the second layer 22 is subjected to an extrusion force, the inclined arrangement of the reinforcing ribs 33 can disperse the force, and prevent the extrusion force from being directly transmitted to the layer body 31 through the reinforcing ribs 33. The extrusion force transmitted to the layer body 31 can be reduced, thereby reducing the extrusion force on the battery cell 11 and ensuring reliable protection of the battery cell 11. For example, the angle between the reinforcing rib 33 and the layer body 31 can be less than or greater than 90 degrees; or the angle between the reinforcing rib 33 and the second layer 22 can be less than or greater than 90 degrees.

[0064] It should be noted that the inclination angle of the reinforcing rib 33 can be flexibly set according to actual conditions. For example, the end of the reinforcing rib 33 away from the battery cell 11 can be inclined toward one side of the battery cell 11 as shown in Figure 7; or the end of the reinforcing rib 33 away from the battery cell 11 can be inclined toward the other side of the battery cell 11 as shown in Figure 9.

[0065] In some embodiments of the present application, a cooling channel is defined between two adjacent reinforcing ribs 33, the layer plate body 31 and the second layer plate 22, so that the coolant can flow in the cooling channel. The coolant can cool the battery cell 11, thereby achieving a uniform temperature effect on the battery cell 11, which is beneficial to extending the service life of the battery cell 11.

[0066] Alternatively, a buffer is provided between two adjacent reinforcing ribs 33, the layer body 31 and the second layer plate 22. The buffer can absorb the extrusion force on the bottom plate assembly 20, reduce the extrusion force transmitted to the battery cell 11, and further protect the battery cell 11, ensuring good protection effect of the battery cell 11.

[0067] According to some embodiments of the present application, a heat conducting member may be provided between the battery module 10 and the bottom plate assembly 20. The heat conducting member can conduct heat from the battery cell 11, thereby dissipating heat from the battery cell 11 and extending the service life of the battery cell 11. For example, the heat conducting member may be a heat-conducting structural adhesive.

[0068] The vehicle according to the embodiment of the present application includes the battery pack 100 according to the embodiment of the present application. Since the battery pack 100 according to the embodiment of the present application has the above-mentioned beneficial technical effects, the vehicle according to the embodiment of the present application includes a first layer plate 21 and a second layer plate 22 arranged at intervals through the bottom plate assembly 20. The first layer plate 21 of the bottom plate assembly 20 is located on the side of the second layer plate 22 close to the battery module 10. The first layer plate 21 is provided with a plurality of recessed portions 211 recessed toward the second layer plate 22. The two side walls of each recessed portion 211 are respectively opposite to two adjacent battery cells 11, so that the recessed portions 211 can avoid the squeezing force on the right-angled surface of the battery cell 11, avoiding the battery cell 11 and the first layer plate 21 from squeezing each other and causing safety hazards. In addition, the structural strength of the bottom plate assembly 20 is high, which facilitates the protection of the battery module 10 and ensures the safety of the battery pack 100.

[0069] During the operation of an electric vehicle, various complex operating conditions may be encountered. To enhance the battery pack 100's ability to cope with these conditions, it is necessary to improve the structural strength of the battery pack 100. Therefore, in some embodiments of the present application, the battery pack 100 can be used in an electric vehicle. The first and second layer plates 21 and 22 facilitate improving the structural strength of the bottom plate assembly 20 and protecting the battery module 10. The first layer plate 21 is provided with a plurality of recessed portions 211, which are recessed toward the second layer plate 22. The side walls of each recessed portion 211 are respectively opposite to two adjacent battery cells 11, so that the right-angled surfaces of the battery cells 11 can be located above the recessed portions 211. The recessed portions 211 can avoid the squeezing force on the right-angled surfaces of the battery cells 11, avoiding the safety hazards caused by the mutual compression between the battery cells 11 and the first layer plate 21, thereby ensuring the safety of the battery pack 100. The battery pack 100 has a compact structure, is lightweight, has a simple manufacturing process, and is low in production cost, which can greatly shorten the performance verification cycle of the battery pack 100.

[0070] Other structures and operations of the battery pack 100 and the vehicle according to the embodiment of the present application are well known to those skilled in the art and will not be described in detail here.

[0071] Although the embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the appended claims. Industrial Applicability

[0072] The battery pack provided in the present application includes a base plate assembly comprising a first layer plate and a second layer plate arranged at intervals. The first layer plate of the base plate assembly is located on the side of the second layer plate close to the battery module. The first layer plate is provided with a plurality of recessed portions recessed toward the second layer plate. The two side walls of each recessed portion are respectively opposite to two adjacent battery cells, so that the recessed portions can avoid the extrusion force on the right-angled surface of the battery cell, thereby avoiding safety hazards caused by mutual compression between the battery cell and the first layer plate. The base plate assembly has high structural strength, which is convenient for protecting the battery module and ensuring the safety of the battery pack.

Claims

1. A battery pack, characterized in that: include: A battery module, wherein the battery module comprises a plurality of battery cells; A base plate assembly, wherein the battery module is arranged on the base plate assembly, and the base plate assembly includes a first layer plate and a second layer plate which are spaced apart, wherein the first layer plate is located on a side of the second layer plate close to the battery module, and the first layer plate is provided with a plurality of recessed portions which are recessed toward the second layer plate, and the two side walls of each recessed portion are respectively opposite to two adjacent battery cells.

2. The battery pack according to claim 1, characterized in that: The base plate assembly also includes: A plurality of connecting ribs, each of the plurality of connecting ribs is located between the first layer plate and the second layer plate, and the plurality of connecting ribs respectively connect the second layer plate and the plurality of recessed portions.

3. The battery pack according to claim 1, characterized in that: The bottom plate assembly is provided with a plurality of avoidance holes arranged at intervals.

4. The battery pack according to claim 3, characterized in that: Each of the battery cells is provided with an explosion-proof valve, which is arranged on a side of the battery cell facing the bottom plate assembly, and a plurality of the explosion-proof valves extend into a plurality of the avoidance holes respectively.

5. The battery pack according to claim 1, characterized in that: The first layer is a one-piece piece; Alternatively, the first layer plate includes a layer plate body and a structural member, the layer plate body is located on a side of the second layer plate close to the battery module, the structural member is arranged between the battery module and the layer plate body, and the recessed portion is provided on the structural member.

6. The battery pack according to claim 5, characterized in that: A plurality of reinforcing ribs are arranged at intervals between the layer plate body and the second layer plate, both ends of the plurality of reinforcing ribs in the height direction are respectively connected to the layer plate body and the second layer plate, and the plurality of reinforcing ribs are respectively located between two adjacent battery cells.

7. The battery pack according to claim 6, characterized in that: The plurality of reinforcing ribs are arranged along the width direction of the battery cell, and one end of each of the reinforcing ribs away from the battery cell is inclined and extends toward one side in the width direction of the battery cell.

8. The battery pack according to claim 6, characterized in that: A cooling channel is defined between two adjacent reinforcing ribs, the layer plate body and the second layer plate; Alternatively, a buffer is provided between two adjacent reinforcing ribs, the layer plate body and the second layer plate.

9. The battery pack according to claim 1, characterized in that: A heat conducting member is provided between the battery module and the bottom plate assembly.

10. A vehicle, characterized in that: Comprising a battery pack according to any one of claims 1-9.

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