Bottom plate assembly and battery pack

Abstract

The invention relates to the technical field of batteries, and discloses a bottom plate assembly and a battery pack, which are used for supporting and protecting battery cells and comprise a bottom protection plate and a module supporting structure. The bottom protection plate comprises a plate body and a connecting convex rib arranged on the plate body, and the connecting convex rib is suitable for being connected with a lower box body of the battery pack; the module supporting structure is arranged at the upper part of the bottom protection plate and comprises a supporting assembly for supporting the battery cell module and a buffering assembly for buffering and absorbing energy; when the bottom protection plate and the module supporting structure are jointly supported between the lower box body and the battery cell module, an exhaust channel suitable for communicating the explosion-proof valve of the battery cell with the outside is formed among the lower box body, the bottom protection plate, the module supporting structure and the battery cell module. According to the invention, the battery cell module can be effectively supported and protected, rapid exhaust is realized under extreme conditions, the internal pressure is reduced, and the safety of the battery pack is improved; in addition, the device has the advantages of being compact in structure, high in rigidity and energy absorption capacity and suitable for being applied to electric automobiles under various complex working conditions.

Description

Technical Field

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

[0002] With the increasing focus on safety performance and energy efficiency, the safety of battery packs is particularly important in electric vehicles. Electric vehicles face various complex working conditions during driving, which puts higher requirements on the structural strength and safety of battery packs. The design of battery packs must not only ensure their performance under normal working conditions, but also have the ability to cope with extreme situations.

[0003] Since the bottom of the battery pack directly faces the road, it is easily affected by external forces such as collisions and scratches. Therefore, improving the protection capability of the bottom of the battery pack is the key to improving the overall safety of the battery pack.

[0004] At present, the reliability of the protection design at the bottom of the battery pack varies. In actual use, there have been many cases of battery pack fires or explosions due to bottom damage, which not only affects the safety performance of the vehicle, but also poses a serious threat to the safety of life and property of passengers.

[0005] In addition, placing the explosion-proof valve at the bottom of the battery cell is a common design solution, but the traditional battery pack bottom plate may not be able to exhaust quickly and effectively in extreme cases, thereby increasing the internal pressure and causing safety hazards. While improving the structural strength of the battery pack bottom plate, the exhaust effect of the explosion-proof valve must also be considered. Summary of the invention

[0006] In view of this, the present invention provides a base plate assembly and a battery pack to solve the problem of how to improve the structural strength of the battery pack base plate and the exhaust effect of the explosion-proof valve.

[0007] In the first aspect, the present invention provides a bottom plate assembly for supporting and protecting battery cells, including a bottom guard plate and a module support structure. The bottom guard plate includes a plate body and a connecting rib provided on the plate body, and the connecting rib is suitable for connecting with the lower box of the battery pack; the module support structure is provided on the upper part of the bottom guard plate, and the module support structure includes a supporting component for supporting the battery cell module and a buffer component for buffering energy absorption; when the bottom guard plate and the module support structure are jointly supported between the lower box and the battery cell module, an exhaust channel suitable for connecting the explosion-proof valve of the battery cell with the outside is formed between the lower box, the bottom guard plate, the module support structure and the battery cell module.

[0008] Beneficial effects: By setting connecting ribs on the bottom guard plate, an exhaust channel suitable for connecting the explosion-proof valve of the battery cell with the outside world is formed between the lower box, the bottom guard plate, the module support structure and the battery cell module. In extreme cases, such as when the internal pressure of the battery cell is too high, the gas inside the battery cell breaks the explosion-proof valve and discharges into the exhaust channel, quickly discharges the gas, reduces the internal pressure, and prevents the occurrence of safety accidents such as explosions. The support component is used to support the battery cell module to ensure the stability and reliability of the battery cell module in the battery pack. The buffer component has the function of absorbing energy, which can absorb external impact energy during vehicle driving, reduce damage to the battery cell module, and enhance overall safety. The bottom plate assembly provided by the present invention can not only effectively support and protect the battery cell module, but also quickly exhaust gas in extreme cases, reduce internal pressure, and thus significantly improve the safety of the battery pack. At the same time, the bottom plate assembly also has the characteristics of compact structure, high rigidity, and strong energy absorption capacity, which is suitable for electric vehicle applications under various complex working conditions. The present invention can improve the bottom safety of the entire battery pack and the extremely rapid exhaust function when the explosion-proof valve is placed at the bottom, thereby improving the safety of the entire battery pack and having obvious economic benefits and value.

[0009] In an optional embodiment, the exhaust channel includes a plurality of first exhaust structures that penetrate the connected convex ribs along the X direction, and the first exhaust structures correspond to the arrangement positions of the explosion-proof valves along the X direction in the battery cell module; and / or, the exhaust channel includes a plurality of second exhaust structures that penetrate the connected convex ribs along the Y direction, and the second exhaust structures correspond to the arrangement positions of the explosion-proof valves along the Y direction in the battery cell module.

[0010] In an optional embodiment, the first exhaust structure includes first grooves, and each first groove along the X direction is connected to the exhaust channel; and / or the second exhaust structure includes second grooves, and each second groove along the Y direction is connected to the exhaust channel.

[0011] In an optional embodiment, the connecting convex ribs include four side ribs located on the four sides of the plate body, a transverse rib located in the middle of the plate body and arranged along the X direction, and a longitudinal rib located in the middle of the plate body and arranged along the Y direction. The first groove passes through the two side ribs and the longitudinal ribs along the Y direction, and the second groove passes through the two side ribs and the transverse ribs along the X direction.

[0012] In an optional embodiment, it also includes a first seal adapted to the first groove and a second seal adapted to the second groove, the first seal is arranged in the first groove of the side rib and the second seal is arranged in the second groove of the side rib to seal the exhaust channel, and the first seal and the second seal are suitable for being flushed open under the valve opening air pressure of the battery cell to connect the exhaust channel with the outside world.

[0013] In an optional embodiment, the connecting rib is provided with a plurality of first mounting holes, and the first mounting holes are suitable for cooperating with the second mounting holes of the lower box of the battery pack and being connected by fasteners.

[0014] In an optional embodiment, the buffer assembly includes a first buffer component, and the first buffer component is arranged between the support assembly and the bottom guard plate.

[0015] In an optional embodiment, the support assembly includes a first support beam for supporting the middle part of the battery cell module and a second support beam for being arranged between adjacent battery cell modules, and the first support beam and the second support beam both have a cavity; the buffer assembly also includes a second buffer member; the cavity of the first support beam and / or the cavity of the second support beam is provided with a second buffer member.

[0016] In an optional embodiment, the first support beam is a straight beam, the second support beam is a T-shaped beam, and the first support beam is disposed between adjacent first exhaust structures or adjacent second exhaust structures.

[0017] In the second aspect, the present invention also provides a battery pack, comprising at least one battery cell module, a lower box body and a bottom plate assembly in the above technical solution. The battery cell module is composed of a plurality of battery cells with explosion-proof valves placed at the bottom, connected in series; the bottom guard plate of the bottom plate assembly is connected to the lower box body, and the module support structure of the bottom plate assembly supports the bottom of the battery cell module.

[0018] Beneficial effect: Because the battery pack includes a base plate assembly, it has the same effect as the base plate assembly and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 1 It is a structural exploded diagram of a first floor assembly according to an embodiment of the present invention;

[0021] Figure 2 It is a structural exploded diagram of a second floor assembly according to an embodiment of the present invention;

[0022] Figure 3 for Figure 2 A schematic diagram of the structure of the bottom guard plate in the bottom plate assembly shown;

[0023] Figure 4 It is a structural exploded diagram of a third floor assembly according to an embodiment of the present invention;

[0024] Figure 5 A top view of a battery pack according to an embodiment of the present invention;

[0025] Figure 6 For along Figure 5 Sectional view at AA in the middle;

[0026] Figure 7 for Figure 6 Exploded diagram of

[0027] Figure 8 for Figure 5 The structural explosion diagram of the battery pack is shown.

[0028] Description of reference numerals:

[0029] 11. Bottom guard plate; 111. Plate body; 112. Connecting ribs; 1121. Side ribs; 1122. Horizontal ribs; 1123. Longitudinal ribs; 113. First exhaust structure; 114. Second exhaust structure; 115. First mounting hole; 12. Module support structure; 121. Support assembly; 1211. First support beam; 1212. Second support beam; 122. Buffer assembly; 1221. First buffer member; 1222. Second buffer member; 10. Bottom plate assembly; 20. Cell module; 21. Explosion-proof valve; 30. Lower box; 40. Liquid cooling plate; 100. Battery pack. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0031] Combine the following Figures 1 to 8 , describing an embodiment of the present invention.

[0032] According to an embodiment of the present invention, in the first aspect, a bottom plate assembly 10 is provided, which is used to support and protect the battery cell, and includes a bottom guard plate 11 and a module support structure 12. The bottom guard plate 11 includes a plate body 111 and a connecting rib 112 provided on the plate body 111, and the connecting rib 112 is suitable for connecting with the lower box 30 of the battery pack 100; the module support structure 12 is provided on the upper part of the bottom guard plate 11, and the module support structure 12 includes a supporting component 121 for supporting the battery cell module 20 and a buffer component 122 for buffering energy absorption; when the bottom guard plate 11 and the module support structure 12 are jointly supported between the lower box 30 and the battery cell module 20, an exhaust channel suitable for connecting the explosion-proof valve 21 of the battery cell with the outside is formed between the lower box 30, the bottom guard plate 11, the module support structure 12 and the battery cell module 20.

[0033] Specifically, the plate body 111 is the main structural part of the bottom guard plate 11, providing basic support and protection functions. The connecting ribs 112 are provided on the plate body 111, which can be connected to the lower box 30 of the battery pack 100, so that the entire bottom plate assembly 10 can be connected to the lower box 30 of the battery pack 100 through the connecting ribs 112. The lower box 30, the bottom guard plate 11, the module support structure 12 and the battery module 20 form an exhaust channel suitable for connecting the explosion-proof valve 21 of the battery cell with the outside world. In extreme cases, such as when the internal pressure of the battery cell is too high, the gas inside the battery cell breaks the explosion-proof valve 21 and is discharged into the exhaust channel, quickly discharging the gas, reducing the internal pressure, and preventing the occurrence of safety accidents such as explosions.

[0034] The support assembly 121 is used to support the battery module 20 to ensure the stability and reliability of the battery module 20 in the battery pack 100. The buffer assembly 122 has an energy absorption function, which can absorb external impact energy during vehicle driving, reduce damage to the battery module 20, and enhance overall safety.

[0035] The bottom plate assembly 10 provided in the embodiment of the present invention can not only effectively support and protect the battery cell module 20, but also quickly exhaust gas in extreme cases to reduce internal pressure, thereby significantly improving the safety of the battery pack 100. At the same time, the bottom plate assembly 10 also has the characteristics of compact structure, high rigidity, and strong energy absorption capacity, and is suitable for electric vehicle applications under various complex working conditions. The present invention can improve the bottom safety of the entire battery pack 100 and the extremely rapid exhaust function when the explosion-proof valve 21 is placed at the bottom, improve the safety of the entire battery pack 100, and has obvious economic benefits and value.

[0036] In some embodiments, the exhaust channel includes a plurality of first exhaust structures 113 that penetrate and connect the convex ribs 112 along the X direction, and the first exhaust structures 113 correspond to the arrangement positions of the explosion-proof valves 21 in the battery cell module 20 along the X direction; and / or, the exhaust channel includes a plurality of second exhaust structures 114 that penetrate and connect the convex ribs 112 along the Y direction, and the second exhaust structures 114 correspond to the arrangement positions of the explosion-proof valves 21 in the battery cell module 20 along the Y direction.

[0037] Since a plurality of explosion-proof valves 21 are arranged at the bottom of the battery cells in the battery cell module 20 in both the X direction and the Y direction, a plurality of first exhaust structures 113 and a plurality of second exhaust structures 114 may be provided correspondingly.

[0038] Specifically, the first exhaust structure 113 corresponds to the arrangement position of the explosion-proof valve 21 in the battery cell module 20 along the X direction. This ensures that each explosion-proof valve 21 arranged along the X direction can directly discharge the gas through the corresponding first exhaust structure 113, thereby achieving fast and efficient exhaust. Similarly, the second exhaust structure 114 corresponds to the arrangement position of the explosion-proof valve 21 in the battery cell module 20 along the Y direction. This ensures that each explosion-proof valve 21 can directly discharge the gas through the corresponding second exhaust structure 114.

[0039] When the first exhaust structure 113 and the second exhaust structure 114 are set at the same time, a multi-directional exhaust scheme is formed, which can fully penetrate the exhaust path of the bottom-mounted explosion-proof valve 21, and can exhaust gas more quickly in a very short time, further enhancing the exhaust efficiency and further improving the safety of the entire package. At the same time, even if the exhaust channel in one direction is blocked, the exhaust channels in other directions can still work normally, and the first exhaust structure 113 and the second exhaust structure 114 are interconnected, providing multiple guarantees for the exhaust of the battery pack 100.

[0040] In some embodiments, the first exhaust structure 113 includes first grooves, each first groove along the X direction is connected to the exhaust channel; and / or the second exhaust structure 114 includes second grooves, each second groove along the Y direction is connected to the exhaust channel.

[0041] The first exhaust structure 113 is provided with a first groove, and the second exhaust structure 114 is provided with a second groove. The structure is simple and easy to process. Such a configuration ensures that the exhaust path is unobstructed, so that the gas can be discharged quickly and evenly. When the internal pressure of the battery cell rises sharply, after the explosion-proof valve 21 is opened, the gas in the exhaust channel can be immediately discharged through the corresponding first groove or second groove, which greatly shortens the exhaust time, reduces the internal pressure, and prevents the battery pack 100 from exploding due to overpressure.

[0042] In such Figure 1 In the illustrated embodiment, the bottom guard plate 11 is provided with only the second groove.

[0043] In such Figure 2 In the illustrated embodiment, the bottom guard plate 11 is provided with only the first groove.

[0044] In such Figure 4 In the embodiment shown, the bottom guard plate 11 is provided with both the first groove and the second groove, wherein the longitudinal rib 1123 is not provided with the first groove.

[0045] In other embodiments, the first exhaust structure 113 and / or the second exhaust structure 114 is an exhaust hole.

[0046] In some embodiments, the connecting ribs 112 include four side ribs 1121 located on the four sides of the plate body 111, a transverse rib 1122 located in the middle of the plate body 111 and arranged along the X direction, and a longitudinal rib 1123 located in the middle of the plate body 111 and arranged along the Y direction. The first groove passes through the two side ribs 1121 and the longitudinal rib 1123 along the Y direction, and the second groove passes through the two side ribs 1121 and the transverse rib 1122 along the X direction.

[0047] Specifically, the four side ribs 1121 are two side ribs 1121 along the X direction and two side ribs 1121 along the Y direction. The four side ribs 1121 provide edge support, and the bottom plate assembly 10 can be connected to the lower box 30 of the battery pack 100 through the four side ribs 1121.

[0048] The transverse reinforcement 1122 and the longitudinal reinforcement 1123 provide support and assembly points in the middle of the bottom guard plate 11 respectively.

[0049] By providing four side ribs 1121, transverse ribs 1122 and longitudinal ribs 1123, the rigidity of the entire floor assembly 10 can be enhanced and its impact resistance can be improved. Multiple ribs can provide more uniform assembly stress points for the bottom guard plate 11 and the lower box 30 of the battery pack 100, avoiding local stress concentration, thereby facilitating the stability and reliability of the overall structure of the battery pack 100.

[0050] The present invention makes the structure of the entire floor assembly 10 more compact through the rational layout of the ribs and grooves, while ensuring efficient exhaust function, and is suitable for the dual requirements of modern electric vehicles for space and performance.

[0051] In some embodiments, it also includes a first seal adapted to the first groove and a second seal adapted to the second groove. The first seal is arranged in the first groove of the side rib 1121 and the second seal is arranged in the second groove of the side rib 1121 to block the exhaust channel. The first seal and the second seal are suitable for being flushed open under the valve opening air pressure of the battery cell to connect the exhaust channel with the outside world.

[0052] By setting a first seal and a second seal, the first seal is arranged in the first groove and the second seal is arranged in the second groove. Under normal working conditions, the first seal and the second seal can effectively block the exhaust channel to prevent external pollutants, moisture, etc. from entering the interior of the battery pack 100, thereby enhancing the dustproof and waterproof performance of the bottom guard plate 11, ensuring the internal environment of the battery pack 100 is stable, and improving the protection level of the entire battery pack 100 to adapt to various harsh working environments.

[0053] When the internal pressure of the battery cell reaches the valve opening pressure, the first seal and the second seal will be opened, so that the exhaust channel is connected to the outside world. This setting ensures that in an emergency, the gas can be discharged quickly to avoid safety accidents such as explosions caused by excessive internal pressure. The first seal and the second seal are set to be opened only under a specific air pressure, avoiding unnecessary exhaust and ensuring the reliability and safety of the system.

[0054] In some embodiments, the connecting rib 112 is provided with a plurality of first mounting holes 115 , and the first mounting holes 115 are adapted to cooperate with the second mounting holes of the lower box body 30 of the battery pack 100 and be connected via fasteners.

[0055] Specifically, when the connecting ribs 112 include side ribs 1121, transverse ribs 1122 and longitudinal ribs 1123, a plurality of first mounting holes 115 are provided on the side ribs 1121, transverse ribs 1122 and longitudinal ribs 1123. That is, the periphery and the middle of the floor assembly 10 are connected to the lower box 30 of the battery pack 100 by fasteners, ensuring the structural stability of the entire battery pack 100.

[0056] In some embodiments, the buffer assembly 122 includes a first buffer member 1221 , and the first buffer member 1221 is disposed between the support assembly 121 and the bottom guard plate 11 .

[0057] By providing the first buffer 1221 between the support assembly 121 and the bottom guard plate 11, the impact energy can be effectively absorbed, reducing the direct transmission of external impact to the battery pack 100, which helps to protect the battery cells and other internal components from damage. At the same time, since the first buffer 1221 provides a shock-absorbing effect, the mechanical fatigue caused by frequent vibration or impact is reduced, and the service life of the support assembly 121 and the bottom guard plate 11 is extended.

[0058] In some embodiments, the support assembly 121 includes a first support beam 1211 for supporting the middle part of the battery cell module 20 and a second support beam 1212 for being arranged between adjacent battery cell modules 20, and the first support beam 1211 and the second support beam 1212 both have a cavity; the buffer assembly 122 also includes a second buffer member 1222; the cavity of the first support beam 1211 and / or the cavity of the second support beam 1212 is provided with a second buffer member 1222.

[0059] By providing the first support beam 1211 and the second support beam 1212, the two work together to provide a more stable support for the battery module 20. The provision of the first support beam 1211 and the second support beam 1212 enables the middle part of the bottom guard plate 11 to better withstand the pressure from above, avoid local deformation, and improve the pressure resistance and stability of the overall structure.

[0060] The first support beam 1211 and the second support beam 1212 are configured as a hollow structure, and the second buffer member 1222 is disposed in the cavity, which can quickly absorb and disperse energy when subjected to external impact, thereby reducing the vibration and impact transmitted to the interior of the battery pack 100, and when the battery cell end cover is subjected to bottom impact force, it can better protect the weaker welding area between the battery cell end cover and the battery cell shell.

[0061] At the same time, the first buffer member 1221 and the second buffer member 1222 work together to form a multi-level shock absorbing system, which can significantly improve the overall impact resistance of the battery pack 100.

[0062] In addition, the first support beam 1211 and the second support beam 1212 adopt a cavity structure, which can also reduce the amount of material used, reduce the overall weight, and help improve the vehicle's cruising range and power performance. At the same time, the second buffer 1222 is arranged in the cavity of the support beam, which fully utilizes the internal structure of the support beam and improves the compactness and rationality of the overall structure of the floor assembly 10.

[0063] In some embodiments, the first support beam 1211 is a straight beam, the second support beam 1212 is a T-shaped beam, and the first support beam 1211 is disposed between adjacent first exhaust structures or adjacent second exhaust structures.

[0064] Specifically, by providing a straight beam and a T-beam, the impact force can be dispersed to different areas, avoiding local stress concentration, reducing the direct impact on a single cell module 20, and protecting the safety of the cell. The straight beam is provided between adjacent first exhaust structures 113 or adjacent second exhaust structures 114, and while providing effective support and buffering for the cell module 20, it can prevent the first exhaust structure 113 or the second exhaust structure 114 from being blocked, thereby ensuring effective and rapid exhaust of the battery pack 100.

[0065] In some embodiments, the first support beam 1211 and the second support beam 1212 are both extended along the Y direction. The bottom guard plate 11 includes transverse ribs 1122 and longitudinal ribs 1123 that are staggered, and the bottom guard plate 11 and the side ribs 1121 are separated into four exhaust cavities. Four straight beams are provided, which are respectively arranged in the four exhaust cavities. That is, when the transverse ribs 1122 or the longitudinal ribs 1123 are provided, the straight beams are avoided from the transverse ribs 1122 or the longitudinal ribs 1123 to ensure the connection between the transverse ribs 1122 and the longitudinal ribs 1123 and the lower box body 30 of the battery pack 100.

[0066] Furthermore, the first support beam 1211 and the second support beam 1212 are both made of materials with good impact resistance and energy absorption function.

[0067] According to an embodiment of the present invention, in a second aspect, a battery pack 100 is further provided, comprising at least one battery cell module 20, a lower box body 30 and the bottom plate assembly 10 in the above embodiment. The battery cell module 20 is composed of a plurality of battery cells with bottom-mounted explosion-proof valves 21 connected in series; the bottom guard plate 11 of the bottom plate assembly 10 is connected to the lower box body 30, and the module support structure 12 of the bottom plate assembly 10 supports the bottom of the battery cell module 20.

[0068] The battery pack 100 provided in the embodiment of the present invention, because it includes the bottom guard plate 11 assembly in the above embodiment, has the effects of compact structure, high rigidity, buffering and energy absorption function, and rapid exhaust function when the explosion-proof valve 21 is placed at the bottom under extreme conditions. The bottom of the entire battery pack 100 has higher safety performance and has obvious economic benefits and value.

[0069] Specifically, the entire battery pack 100 has a high overall structural rigidity, and the bottom can better protect the explosion-proof valve 21 and the battery cell from being subjected to external impact force, forming a sandwich structure with high rigidity and buffering energy absorption function.

[0070] In some embodiments, the lower box body 30 includes two L-shaped side beams, one section of the side beam supports the bottom of the battery cell module 20, and the other section abuts against the side wall of the battery cell module 20 to limit the battery cell module 20 and ensure the stability of the internal structure of the battery pack 100.

[0071] In some embodiments, the battery pack 100 further includes a liquid cooling plate 40. The liquid cooling plate 40 has the functions of cooling the battery cell, equalizing the temperature, and providing support; the liquid cooling plate 40 is bonded to the battery cell module 20 by a heat-conducting structural adhesive, and the adhesive of the liquid cooling plate 40 can provide heat conduction and connection; the liquid cooling plate 40 is connected to the box body by bolts.

[0072] Since the battery pack 100 includes the floor assembly 10 and has all the effects of the floor assembly 10 , they will not be described in detail here.

[0073] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A base plate assembly for supporting and protecting a battery cell, characterized in that: include: A bottom guard plate, the bottom guard plate comprising a plate body and a connecting rib provided on the plate body, the connecting rib being suitable for connecting with a lower box body of a battery pack; A module support structure, the module support structure is arranged on the upper part of the bottom guard plate, and the module support structure includes a support component for supporting the battery module and a buffer component for buffering energy absorption; When the bottom guard plate and the module support structure are jointly supported between the lower box and the battery cell module, an exhaust passage suitable for connecting the explosion-proof valve of the battery cell with the outside is formed between the lower box, the bottom guard plate, the module support structure and the battery cell module.

2. The floor assembly according to claim 1, characterized in that: The exhaust channel includes a plurality of first exhaust structures penetrating the connecting ribs along the X direction, and the first exhaust structures correspond to the arrangement positions of the explosion-proof valves in the battery cell module along the X direction; and / or, The exhaust channel includes a plurality of second exhaust structures penetrating the connecting ribs along the Y direction, and the second exhaust structures correspond to the arrangement positions of the explosion-proof valves in the battery cell module along the Y direction.

3. The floor assembly according to claim 2, characterized in that: The first exhaust structure comprises first grooves, and each of the first grooves along the X direction is connected to the exhaust channel; and / or, The second exhaust structure includes second grooves, and each of the second grooves along the Y direction is connected to the exhaust channel.

4. The floor assembly according to claim 3, characterized in that: The connecting convex ribs include four side ribs located on the four sides of the plate body, a transverse rib located in the middle of the plate body and arranged along the X direction, and a longitudinal rib located in the middle of the plate body and arranged along the Y direction. The first groove passes through the two side ribs along the Y direction and the longitudinal ribs, and the second groove passes through the two side ribs along the X direction and the transverse ribs.

5. The floor assembly according to claim 4, characterized in that: It also includes a first seal adapted to the first groove and a second seal adapted to the second groove, the first seal is arranged in the first groove of the side rib and the second seal is arranged in the second groove of the side rib to seal the exhaust channel, the first seal and the second seal are suitable for being flushed open under the valve opening air pressure of the battery cell to connect the exhaust channel with the outside world.

6. The floor assembly according to any one of claims 1 to 5, characterized in that: The connecting rib is provided with a plurality of first mounting holes, and the first mounting holes are suitable for cooperating with the second mounting holes of the lower box of the battery pack and being connected by fasteners.

7. The floor assembly according to any one of claims 1 to 5, characterized in that: The buffer assembly includes a first buffer member, which is arranged between the support assembly and the bottom guard plate.

8. The floor assembly according to claim 7, characterized in that: The support assembly includes a first support beam for supporting the middle part of the battery cell module and a second support beam for being arranged between adjacent battery cell modules, and the first support beam and the second support beam both have a cavity; the buffer assembly also includes a second buffer member; the cavity of the first support beam and / or the cavity of the second support beam is provided with the second buffer member.

9. The floor assembly according to claim 8, characterized in that: The first support beam is a straight beam, the second support beam is a T-shaped beam, and the first support beam is arranged between adjacent first exhaust structures or adjacent second exhaust structures.

10. A battery pack, characterized in that: include: At least one battery cell module, composed of a plurality of battery cells with explosion-proof valves placed at the bottom connected in series; lower box; The floor assembly according to any one of claims 1 to 9, wherein the bottom guard plate of the floor assembly is connected to the lower box body, and the module support structure of the floor assembly supports the bottom of the battery cell module.

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