Floor assembly and battery pack

Abstract

The present invention relates to the field of battery technology, and discloses a bottom plate assembly and a battery pack 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 connecting ribs provided on the plate body, and the connecting ribs are suitable for connecting to the lower box body 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 support 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 body and the battery cell module, an exhaust channel suitable for connecting the explosion-proof valve of the battery cell to the outside world is formed between the lower box body, the bottom guard plate, the module support structure and the battery cell module. The present invention can effectively support and protect the battery cell module, and can quickly exhaust air in extreme cases, reduce internal pressure, and improve the safety of the battery pack; it 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.

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 increasing attention to safety and energy efficiency, battery pack safety is becoming increasingly crucial in electric vehicles. Electric vehicles face a variety of complex operating conditions during operation, placing higher demands on the structural strength and safety of battery packs. Battery pack design must not only ensure performance under normal operating conditions but also be able to withstand extreme conditions.

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

[0004] At present, the reliability of the protective design of the bottom of the battery pack is uneven. In actual use, there have been many cases of battery pack fires or explosions due to damage to the bottom. This not only affects the safety performance of the vehicle, but also poses a serious threat to the safety of passengers' lives and property.

[0005] Furthermore, while placing the explosion-proof valve at the bottom of the battery pack is a common design solution, the traditional battery pack floor may not be able to quickly and effectively vent air in extreme situations, increasing internal pressure and posing a safety hazard. While improving the structural strength of the battery pack floor, the venting effectiveness 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 its first aspect, the present invention provides a bottom plate assembly for supporting and protecting battery cells, comprising a bottom guard plate and a module support structure. The bottom guard plate comprises a plate body and connecting ribs provided on the plate body, which are adapted to connect to the lower case of a battery pack. The module support structure is provided above the bottom guard plate and comprises a support assembly for supporting the battery cell module and a buffer assembly for buffering and absorbing energy. When the bottom guard plate and the module support structure are jointly supported between the lower case and the battery cell module, an exhaust passage is formed between the lower case, the bottom guard plate, the module support structure, and the battery cell module, which is adapted to connect the battery cell's explosion-proof valve to the outside world.

[0008] Beneficial effects: By arranging connecting ribs on the bottom guard plate, an exhaust channel suitable for connecting the explosion-proof valve of the battery cell to the outside world is formed between the lower box body, 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 is discharged into the exhaust channel, quickly discharging the gas, reducing the internal pressure and preventing the occurrence of safety accidents such as explosions. The support assembly 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 assembly has the function of absorbing energy and 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, 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 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 several first exhaust structures that pass through the connected 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 several second exhaust structures that pass through the connected 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 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 rib along the Y direction, and the second groove passes through the two side ribs and the transverse rib 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 adapted to cooperate with the second mounting holes of the lower box of the battery pack and be connected via fasteners.

[0014] In an optional embodiment, the buffer assembly includes a first buffer member, which 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 arranged between adjacent first exhaust structures or adjacent second exhaust structures.

[0017] In a second aspect, the present invention also provides a battery pack comprising at least one cell module, a lower case, and the base plate assembly described in the above technical solution. The cell module is composed of multiple cells connected in series with explosion-proof valves positioned below. The base plate assembly's bottom guard plate is connected to the lower case, and the base plate assembly's module support structure supports the bottom of the cell module.

[0018] Beneficial effects: Since the battery pack includes a base plate assembly, it has the same effects 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 embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is an exploded view of the structure of the first floor assembly according to an embodiment of the present invention;

[0021] Figure 2 This is an exploded view of the structure of the second floor assembly according to an embodiment of the present invention;

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

[0023] Figure 4 This is an exploded view of the structure 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 the Figure 5 Cross-sectional view at AA in the middle;

[0026] Figure 7 for Figure 6 Exploded diagram;

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

[0031] The following combination Figures 1 to 8 , describing embodiments of the present invention.

[0032] According to an embodiment of the present invention, in a first aspect, a bottom plate assembly 10 is provided for supporting and protecting battery cells, comprising a bottom guard plate 11 and a module support structure 12. The bottom guard plate 11 comprises a plate body 111 and a connecting rib 112 provided on the plate body 111, wherein the connecting rib 112 is adapted to be connected to the lower case 30 of the battery pack 100; the module support structure 12 is provided on the upper portion of the bottom guard plate 11, and the module support structure 12 comprises a supporting component 121 for supporting the battery cell module 20 and a buffer component 122 for buffering and absorbing energy; when the bottom guard plate 11 and the module support structure 12 are jointly supported between the lower case 30 and the battery cell module 20, an exhaust passage is formed between the lower case 30, the bottom guard plate 11, the module support structure 12 and the battery cell module 20, which is adapted to connect the explosion-proof valve 21 of the battery cell to the outside world.

[0033] Specifically, the plate body 111 is the main structural component of the bottom guard plate 11, providing basic support and protection. Connecting ribs 112 are provided on the plate body 111 and can connect to the lower case 30 of the battery pack 100. This facilitates connecting the entire bottom plate assembly 10 to the lower case 30 of the battery pack 100 via the connecting ribs 112. An exhaust passage is formed between the lower case 30, the bottom guard plate 11, the module support structure 12, and the cell module 20, connecting the explosion-proof valve 21 of the battery cell to 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 can break through the explosion-proof valve 21 and be discharged into the exhaust passage, rapidly discharging the gas, reducing the internal pressure and preventing safety accidents such as explosions.

[0034] Support assembly 121 supports cell module 20, ensuring its stability and reliability within battery pack 100. Buffer assembly 122 absorbs external impact energy during vehicle operation, minimizing damage to cell module 20 and enhancing overall safety.

[0035] The floor assembly 10 provided by the embodiments of the present invention not only effectively supports and protects the battery cell modules 20 but also rapidly vents air in extreme situations, reducing internal pressure and significantly improving the safety of the battery pack 100. Furthermore, the floor assembly 10 features a compact structure, high rigidity, and strong energy absorption capacity, making it suitable for electric vehicle applications under various complex operating conditions. This invention enhances the bottom safety of the entire battery pack 100 and the extremely rapid venting function when the explosion-proof valve 21 is positioned at the bottom, improving the safety of the entire battery pack 100 and providing significant economic benefits and value.

[0036] In some embodiments, the exhaust channel includes a plurality of first exhaust structures 113 that pass through the connected 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 pass through the connected 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 accordingly.

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

[0039] When the first exhaust structure 113 and the second exhaust structure 114 are installed simultaneously, a multi-directional exhaust scheme is formed, which can fully penetrate the exhaust path of the bottom-mounted explosion-proof valve 21. This can more quickly exhaust gas in a very short time, further enhancing exhaust efficiency and the safety of the entire pack. At the same time, even if the exhaust channel in one direction is blocked, the exhaust channels in other directions can still operate normally. The interconnection between the first exhaust structure 113 and the second exhaust structure 114 provides 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. This structure is simple and easy to manufacture. This arrangement ensures an unobstructed exhaust path, allowing gas to be discharged quickly and evenly. When the internal pressure of the battery cell rises sharply, the explosion-proof valve 21 opens, and the gas in the exhaust channel can be immediately discharged through the corresponding first groove or second groove. This greatly shortens the exhaust time, reduces internal pressure, and prevents the battery pack 100 from exploding due to overpressure.

[0042] In such Figure 1 In the embodiment shown, 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 can connect the bottom plate assembly 10 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] The provision of four side ribs 1121, transverse ribs 1122, and longitudinal ribs 1123 enhances the rigidity of the entire floor assembly 10 and improves its impact resistance. These multiple ribs provide more evenly distributed stress points for the floor guard plate 11 and the lower case 30 of the battery pack 100, preventing localized stress concentration and thereby improving the overall structural stability and reliability 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 stability of the internal environment of the battery pack 100, 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 and second seals are forced open, allowing the exhaust passage to connect to the outside world. This arrangement ensures that gas can be quickly discharged in an emergency, preventing safety accidents such as explosions caused by excessive internal pressure. The first and second seals are set to break only at a specific pressure, preventing 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 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, each of the side ribs 1121, transverse ribs 1122, and longitudinal ribs 1123 is provided with a plurality of first mounting holes 115. In other words, the periphery and central portions of the floor plate assembly 10 are connected to the lower case 30 of the battery pack 100 via 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 , which is disposed between the support assembly 121 and the bottom guard plate 11 .

[0057] By providing a first buffer member 1221 between the support assembly 121 and the bottom guard plate 11, it effectively absorbs impact energy, reduces the direct transmission of external impact to the battery pack 100, and helps protect the battery cells and other internal components from damage. Furthermore, the shock absorption provided by the first buffer member 1221 reduces mechanical fatigue caused by frequent vibration or impact, thereby extending the service life of the support assembly 121 and the bottom guard plate 11.

[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 more stable support for the battery cell module 20. The provision of the first support beam 1211 and the second support beam 1212 allows the central portion of the bottom guard plate 11 to better withstand pressure from above, avoid local deformation, and improve the compressive resistance and stability of the overall structure.

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

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

[0062] Furthermore, the hollow structure of first support beam 1211 and second support beam 1212 reduces material usage and overall weight, thereby improving the vehicle's range and power performance. Furthermore, the placement of second buffer member 1222 within the hollow structure of the support beams fully utilizes the internal structure of the support beams, enhancing the compactness and rationality of the overall structure of 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 direct impact on individual cell modules 20, and protecting the safety of the battery cells. The straight beam is arranged between adjacent first exhaust structures 113 or adjacent second exhaust structures 114. While providing effective support and cushioning for the cell modules 20, it can also prevent the first exhaust structure 113 or the second exhaust structure 114 from being blocked, 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, which divide the space between the bottom guard plate 11 and the side ribs 1121 into four exhaust cavities. Four straight beams are provided, each of which is provided in the four exhaust cavities. That is, when the transverse ribs 1122 or the longitudinal ribs 1123 are provided, the straight beams are provided to avoid 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 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 a second aspect of an embodiment of the present invention, a battery pack 100 is provided, comprising at least one cell module 20, a lower case 30, and the base plate assembly 10 described in the above embodiment. The cell module 20 is composed of multiple cells connected in series with explosion-proof valves 21 positioned below. The bottom guard plate 11 of the base plate assembly 10 is connected to the lower case 30, and the module support structure 12 of the base plate assembly 10 supports the bottom of the 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 stress when subjected to external impact force, forming a sandwich structure with high rigidity and buffering energy absorption function.

[0070] In some embodiments, the lower box 30 includes two L-shaped side beams, one section of which supports the bottom of the battery cell module 20, and the other section abuts against the side wall of the battery cell module 20, thereby limiting the battery cell module 20 and ensuring 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 cools the battery cells, distributes the temperature uniformly, and provides support. The liquid cooling plate 40 is bonded to the battery module 20 using a thermally conductive structural adhesive. The adhesive provides thermal conductivity and connection. The liquid cooling plate 40 is connected to the housing using bolts.

[0072] Since the battery pack 100 includes the floor assembly 10 and has all the effects of the floor assembly 10 , details thereof will not be repeated here.

[0073] Although the embodiments of the present invention 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 invention. 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 to the lower box of the battery pack; A module support structure, the module support structure is provided on the upper portion of the bottom guard plate, the module support structure includes a support component for supporting the battery module and a buffer component for buffering and absorbing energy; When the bottom guard plate and the module support structure are jointly supported between the lower box and the battery 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 module; The exhaust channel includes a plurality of first exhaust structures penetrating the connecting rib 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 rib 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; The first exhaust structure includes 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; The connecting 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.

2. The floor assembly according to claim 1, 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.

3. The floor assembly according to claim 1 or 2, characterized in that: The connecting rib is provided with a plurality of first mounting holes, which are adapted to cooperate with the second mounting holes of the lower box of the battery pack and be connected via fasteners.

4. The floor assembly according to claim 1 or 2, characterized in that: The buffer assembly includes a first buffer member, which is arranged between the support assembly and the bottom guard plate.

5. The floor assembly according to claim 4, 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.

6. The floor assembly according to claim 5, 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.

7. A battery pack, characterized in that: include: At least one battery cell module, consisting of multiple 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 6, 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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