Base plate assembly and housing and battery pack with base plate assembly

Abstract

Base plate arrangement attached to a housing of a battery pack, wherein the base plate arrangement is designed to support battery cells, wherein explosion-proof valves of the battery cells are arranged in the direction of the base plate arrangement, characterized in that the base plate arrangement has the following: a base plate which has vent openings connected to the explosion-proof valves; a floor protection plate that is arranged on the underside of the floor plate; Energy-absorbing elements arranged between the base plate and the base plate, wherein a plurality of energy-absorbing holes are formed in the energy-absorbing elements, a plurality of energy-absorbing elements are provided, and the plurality of energy-absorbing elements are arranged at intervals in a horizontal plane, and the base plate, the base plate, and the plurality of energy-absorbing elements interact to define outlet channels that are connected to the vent openings.

Description

CROSS-REFERENCE TO RELATED REGISTRATIONS

[0001] The present application is based on the Chinese patent application with application number 202321043365.3, which was filed with the Chinese Patent Office on April 28, 2023, and claims priority from the Chinese patent application. The disclosure of the aforementioned application is incorporated herein in full by reference. TECHNICAL AREA

[0002] The present application relates to the technical field of the battery, in particular to a base plate arrangement as well as a housing and a battery pack which are provided with the base plate arrangement. BACKGROUND

[0003] As consumers increasingly prioritize vehicle safety and longevity, the safety performance of the battery pack becomes ever more critical. Various complex operating conditions occur during driving, and the battery pack must possess sufficient structural strength to withstand these diverse conditions. The safety performance of the battery pack can be significantly improved or modified through different structural designs. With the development of new processes and technologies, battery pack structures have taken on a wide variety of forms. Positioning the explosion-proof valves towards the bottom of the pack can better mitigate the risk of a short-circuit spark caused by high-temperature gas flowing through the busbar during thermal runaway, thus improving the battery pack's safety performance.In related technologies, the base of the battery pack is insufficiently protected against the battery cells, and the safety-related performance is low. SUMMARY

[0004] The present application is based on the discovery of the following facts and problems by the inventor of the present application: In a battery pack structure with an explosion-proof valve at the bottom, an exhaust diversion structure is typically required at the bottom of the battery pack to better vent high-temperature gases in the event of thermal runaway. This structure redirects and vents the high-temperature gas escaping from the explosion-proof valve. However, since the vehicle may come into contact with foreign objects on the ground during travel, the exhaust diversion structure cannot effectively protect the base of the battery cells and the explosion-proof valve if the ground is subjected to impact. Furthermore, the battery cells in the battery pack are subjected to vibration by the shocks and vibrations experienced during travel. Consequently, the battery pack's performance in protecting the ground is poor, its overall vibration resistance is weak, and its safety performance is compromised.

[0005] One objective of the present application is to solve at least one of the technical problems existing in the prior art. To this end, the present application provides a base plate arrangement that can improve the ground protection performance of the battery pack and have a good vibration-damping effect on the battery pack, thus improving the overall safety-related performance of the battery pack.

[0006] The present application also provides a housing with the base plate arrangement described above.

[0007] The present application also provides a battery pack with the housing described above.

[0008] According to the first aspect of the present application, a base plate arrangement is provided which is attached to a housing of a battery pack, wherein the base plate arrangement is configured to support battery cells, wherein explosion-proof valves of the battery cells are arranged in the direction of the base plate arrangement.The base plate arrangement comprises: a base plate having vent openings connected to the explosion-proof valves; a base plate arranged on the underside of the base plate; energy-absorbing elements arranged between the base plate and the base plate, wherein a plurality of energy-absorbing holes are formed in the energy-absorbing elements, a plurality of energy-absorbing elements are provided, and the plurality of energy-absorbing elements are arranged at intervals in a horizontal plane, and the base plate, the base plate, and the plurality of energy-absorbing elements interact to define outlet channels connected to the vent openings.

[0009] In the base plate arrangement of the present application, the numerous energy-absorbing elements are spaced at intervals. These energy-absorbing elements feature numerous energy-absorbing holes, and they interact with the base plate and the base plate to define discharge channels. This results in improved ground-related performance, vibration reduction, and a buffering effect for the battery pack, as well as improved safety-related performance. Furthermore, the base plate arrangement is more compact, thus improving the energy density of the battery pack to a certain extent.

[0010] Furthermore, the base plate arrangement according to the present application may have the following additional technical features: In some embodiments of the present application, the cross-section of the energy-absorbing hole is circular or polygonal.

[0011] In one embodiment of the present application, the plurality of energy-absorbing holes in a matrix are arranged in the horizontal plane.

[0012] In some embodiments of the present application, the energy-absorbing element comprises: a main body and a membrane layer, the energy-absorbing holes are formed on the main body and penetrate the main body in the top-bottom direction, and two membrane layers are provided, wherein the two membrane layers are each provided on both sides of the top-bottom direction of the main body and are connected to an upper surface and a lower surface of the main body.

[0013] In some embodiments of the present application, the energy-absorbing elements are provided on both sides of the vent openings in a longitudinal or a transverse direction of the housing, wherein the two energy-absorbing elements located on both sides of the vent openings interact with the base plate and the lower protective plate to define the outlet channels.

[0014] In one embodiment of the present application, the distance between the energy-absorbing element and the explosion-proof valve in the horizontal plane is greater than or equal to 10 mm.

[0015] In some embodiments of the present application, the energy-absorbing elements are a foam element or a woven mesh element.

[0016] In some embodiments of the present application, the surface of the floor protection plate is provided with a protective layer on the side facing away from the energy-absorbing elements.

[0017] According to the second aspect of the present application, a housing is provided which has a frame and a base plate arrangement according to the first aspect of the present application, wherein the base plate arrangement is connected to the bottom of the frame.

[0018] According to the housing of the present application, which is equipped with the base plate arrangement of the first aspect, a plurality of energy-absorbing elements are provided at intervals. These energy-absorbing elements have a plurality of energy-absorbing holes, and the energy-absorbing elements interact with the base plate and the base protection plate to define discharge channels. This results in improved performance for protecting the ground, better vibration reduction and buffering, and improved battery pack safety. Furthermore, the structure of the base plate arrangement is more compact, thus improving the energy density of the battery pack to a certain extent.

[0019] According to the third aspect of the present application, a battery pack is provided which has a plurality of battery cells and the housing according to the second aspect of the present application, wherein the plurality of battery cells is arranged in the housing and supported on the base plate arrangement and the explosion-proof valves of the plurality of battery cells are all arranged in the direction of the base plate arrangement.

[0020] According to the battery pack of the present application, which is equipped with the housing of the second aspect of the present application, a plurality of energy-absorbing elements are provided at intervals. These energy-absorbing elements have a plurality of energy-absorbing holes, and the energy-absorbing elements interact with the base plate and the base protection plate to define the discharge channels, so that the battery pack has better base protection performance, vibration reduction and a buffering effect, and the safety of the battery pack is improved. In addition, the base plate arrangement is more compact, so that the energy density of the battery pack is improved to a certain extent.

[0021] The additional aspects and advantages of the present application will be partly given in the following description, and some will become obvious from the following description, or will be understood through the implementation of the present application. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a schematic representation of a battery pack according to an embodiment of the present application; Fig. 2 is a schematic representation of the floor slab arrangement and the in Fig. 1 battery cells shown; Fig. 3 is a schematic representation of the in Fig. 1 shown floor slab arrangement; Fig. 4 is a cross-sectional view of the in Fig. 3 floor slab arrangement shown; Fig. Figure 5 is a schematic representation of the energy-absorbing elements and the floor protection plate according to Fig. 3; Fig. 6 is a schematic representation of the floor slab arrangement and the in Fig. 3 battery cells shown; Fig. 7 is a partially schematic representation of the floor slab arrangement and the in Fig. 6 battery cells shown; Fig. Figure 8 is a partial schematic representation of the floor slab arrangement and the in Fig. 7 battery cells shown; Fig. Figure 9 is a partial schematic representation of the floor slab arrangement and the in Fig. 8 battery cells shown; Fig. Figure 10 is a schematic representation in the thickness direction of an energy-absorbing element with an energy-absorbing hole having a hexagonal cross-section; Fig. 11 is a schematic diagram of the in Fig. 10 energy-absorbing elements shown; Fig. Figure 12 is a schematic diagram in the thickness direction of an energy-absorbing element with an energy-absorbing hole with a circular cross-section; Fig. 13 is a schematic diagram of the in Fig. 12 energy-absorbing elements shown; Fig. Figure 14 is a schematic representation in the thickness direction of an energy-absorbing element with an energy-absorbing hole having a narrow rectangular cross-section; Fig. 15 is a schematic diagram of the in Fig. 14 energy-absorbing elements shown; Fig. Figure 16 is a schematic representation in the thickness direction of an energy-absorbing element with an energy-absorbing hole having a wide rectangular cross-section; Fig. 17 is a schematic diagram of the in Fig. 16 energy-absorbing elements shown; Fig. Figure 18 is a schematic representation of the position of the ball impact support strip structure in a conventional floor slab arrangement; Fig. Figure 19 is a schematic representation of the ball impact position of the energy-absorbing elements in the base plate arrangement according to the embodiment of the present application. Reference symbol:

[0022] 10. Base plate arrangement; 101. Outlet channel; 11. Base plate; 111. Ventilation opening; 12. Energy-absorbing element; 121. Main body; 1211. Energy-absorbing hole; 122. Membrane layer; 13. Base protection plate; 131. Protective layer; 100. Housing; 200. Battery cell; 201. Explosion-proof valve; 300. Liquid cooling plate; 400. Battery management system; 500. Battery power distribution system; 1000 battery packs. DETAILED DESCRIPTION OF THE EXECUTION FORMS

[0023] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, where identical or similar reference numerals everywhere represent identical or similar elements or elements with identical or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to illustrate the present application and are not to be understood as limiting the present application.

[0024] First, a battery pack 1000 according to an embodiment of the third aspect of the present application is described with reference to the Fig. 1-19 briefly described. The battery pack 1000 comprises a housing 100 according to an embodiment of the second aspect of the present application and a plurality of battery cells 200. The housing 100 is provided with a base plate arrangement 10 according to an embodiment of the first aspect of the present application. The base plate arrangement 10 is configured to support the battery cells 200. The explosion-proof valves 201 of the battery cells 200 are arranged facing the base plate arrangement 10.

[0025] The base plate arrangement 10 according to an embodiment of the first aspect of the present application is described below with reference to the Fig. 1-19 described.

[0026] As in the Fig. Figure 3-17 shows that, according to one embodiment of the first aspect of the present application, the base plate arrangement 10 comprises a base plate 11, a base protection plate 13, and energy-absorbing elements 12. In particular, the base plate 11 is provided with vent openings 111 which are connected to the explosion-proof valves 201; the base protection plate 13 is provided on the underside of the base plate 11; the energy-absorbing elements 12 are provided between the base protection plate 13 and the base plate 11, and the energy-absorbing elements 12 have a plurality of energy-absorbing holes 1211. A plurality of the energy-absorbing elements 12 are provided, arranged at intervals in the horizontal plane. The base plate 11, the base protection plate 13 and the multitude of energy-absorbing elements 12 work together to form outlet channels 101 which are connected to the vent openings 111.

[0027] If the battery pack 1000 experiences thermal runaway, high-temperature gas escapes from the explosion-proof valves 201, and the escaped high-temperature gas enters through the vent openings 111 of the base plate 11 and into the outlet channels 101 defined by the multitude of energy-absorbing elements 12 and is finally discharged from the battery pack 1000.

[0028] The base plate assembly 10 of the present embodiment is provided with vent holes 111 that are connected to the explosion-proof valves 201 on the base plate 11, so that the high-temperature gas expelled by the explosion-proof valves 201 can flow directly through the vent holes 111 and into the outlet channels 101, thereby separating the high-temperature gas from the battery cells 200 to a certain extent. This, in turn, reduces the effects and damage of the high-temperature gas on other battery cells 200, thus improving the safety-related performance of the battery pack 1000 to a certain degree. Furthermore, the base plate 11 can provide a better support surface for the battery cells 200, enabling them to be mounted more securely in the battery pack 1000.

[0029] The base plate arrangement 10 of the present embodiment has a plurality of energy-absorbing elements 12 provided between the base plate 11 and the lower protective plate 13, and a plurality of energy-absorbing holes 1211 are provided in the energy-absorbing elements 12. In this arrangement, the energy-absorbing elements 12 can absorb more impact force through the deformation of the energy-absorbing holes 1211 under the influence of an external shock, thereby achieving good vibration reduction and protection for the battery cells 200 on the base plate 11 and the explosion-proof valves 201 on the battery cells 200, thus reducing the deformation of the battery cells 200.This allows the battery cells 200 and the explosion-proof valves 201 of the battery cells 200 to be stored stably and reliably in the battery pack 1000, thus greatly improving the ground protection performance and the vibration reduction buffer performance of the battery pack 1000, resulting in better safety-related performance of the battery pack 1000.

[0030] The base plate assembly 10 of the present embodiment is assembled by arranging and attaching a plurality of energy-absorbing elements 12 to the base plate 13, and then the base plate 11 is attached to the upper side of the plurality of energy-absorbing elements 12 to complete the assembly of the base plate assembly 10, which is very convenient to arrange. The energy-absorbing elements 12 are arranged at intervals and work together with the base plate 11 and the base plate 13 to define the exhaust ducts 101, so that the structural design of the base plate assembly 10 is simple and ingenious.In this arrangement, the entire structure of the base plate arrangement 10 is more compact, and the volume of the base plate arrangement 10 in the battery pack 1000 then makes up a smaller proportion, which is advantageous to a certain extent for improving the energy density of the battery pack 1000, thus improving the performance of the battery pack 1000.

[0031] According to the base plate arrangement 10 of the embodiment of the present application, a plurality of energy-absorbing elements 12 are provided at intervals. The energy-absorbing elements 12 have a plurality of energy-absorbing holes 1211, and the energy-absorbing elements 12 interact with the base plate 11 and the base protection plate 13 to define the outlet channels 101. This results in the battery pack 1000 exhibiting improved performance in protecting the ground, as well as vibration reduction and a buffering effect, thereby improving the safety of the battery pack 1000. Furthermore, the structure of the base plate arrangement 10 is more compact, thus improving the energy density of the battery pack 1000 to a certain extent.

[0032] In some embodiments of the present application, as in the Fig. As shown in Figures 10-17, the cross-section of the energy-absorbing hole 1211 can be circular or polygonal. Therefore, the cross-section of the energy-absorbing hole 1211 is set to be circular or polygonal, which results in a simple structure, ease of machining, and good energy absorption. For example, the cross-section of the energy-absorbing hole 1211 can be circular, or it can be a narrow rectangle, a wide rectangle, a pentagon, a hexagon, etc. The shape of the cross-section of the energy-absorbing hole 1211 can be sensibly adjusted according to actual needs and application effects. Preferably, the cross-section of the energy-absorbing hole 1211 is a hexagon.

[0033] In some embodiments of the present application, as in the Fig. As shown in Figures 10-17, a multitude of energy absorption holes are arranged in a matrix in the horizontal plane. With this arrangement, the overall structural strength of the energy absorption elements 12 can be more balanced and stable, so that the energy absorption elements 12 can provide good support and energy absorption buffering for several battery cells 200, with a simple structure and reliable use.

[0034] In one embodiment of the present application, as described in the Fig. As shown in Figures 10-17, the dimensions of the energy absorption hole 1211 in the first direction (left-right direction, as in Fig. (11 shown) in the first plane parallel to the cross-section, there shall be a first dimension “s1”, and the first dimension “s1” shall be 0.2–0.4 times the length of the explosion-proof valve 201. The dimension of the energy absorption hole 1211 in the second direction (front-to-back direction, as shown in Fig. (11 shown) in the first plane there can be a second size “s2”, and the second size “s2” is 0.4-0.6 times the length of the explosion-proof valve 201, and the first direction is perpendicular to the second direction.

[0035] It should be noted that the definition of the direction of the cross-section of the energy absorption hole 1211 is only made to simplify the description of the dimensions of the energy absorption hole 1211. In actual production and processing, the arrangement of the energy absorption hole 1211 in the energy absorption elements 12 and the direction of the cross-section are not limited to a single direction. By limiting the size of the energy absorption hole 1211, the energy absorption elements 12 can therefore have sufficient supporting force to stably and reliably support the battery cells 200. In addition, the energy absorption elements 12 can have a good energy absorption buffer and vibration reduction effect to better protect the battery cells 200 and the explosion-proof valves 201 of the battery cells 200. For example, the first size “s1” can be 0.2, 0.3, 0.4, etc.The first size “s2” can be 0.4, 0.5, 0.6, etc. times the length of the explosion-proof valve 201. Preferably, the first size is 0.2 times the length of the explosion-proof valve 201, and the second size is 0.5 times the length of the explosion-proof valve 201.

[0036] In some embodiments of the present application, as in Fig. As shown in Figure 10, the energy-absorbing elements 12 can have: a main body 121 and a membrane layer 122; energy-absorbing holes 1211 are formed on the main body 121 and penetrate the main body 121 in the top-bottom direction (the top-bottom direction in Figure 10). Fig. 9 and Fig. (10 shown). Two membrane layers 122 are provided, each positioned on both sides of the top-bottom direction of the main body 121 and connected to the upper and lower surfaces of the main body 121. Thus, by arranging the membrane layer 122 on the upper and lower sides of the main body 121 of the energy-absorbing elements 12, the structural integrity of the energy-absorbing elements 12 with their multiple energy-absorbing holes 1211 can be improved, resulting in better support stiffness for the energy-absorbing elements 12 and an improved support effect for the base plate assembly 10. Furthermore, it is convenient for the energy-absorbing elements 12 to be mounted between the base plate 11 and the base plate 13, especially when the floor space is relatively narrow, making the installation of the energy-absorbing elements 12 easier.Optionally, the energy-absorbing elements 12 are not provided with a membrane layer 122.

[0037] In some embodiments of the present application, as described in Fig. Figure 9 shows that energy-absorbing elements 12 are provided on both sides of the vent opening 111 in the longitudinal or transverse direction of the housing 100. The two energy-absorbing elements 12 located on both sides of the vent opening 111 cooperate with the base plate 11 and the lower protective plate 13 to define the exhaust channel 101. Therefore, in the arrangement, the plurality of energy-absorbing elements 12 can be arranged on both sides of the vent opening 111 in the longitudinal direction of the housing 100 to form the exhaust channel 101, and the plurality of energy-absorbing elements 12 can further be arranged on both sides of the vent opening 111 in the transverse direction of the housing 100 to form the exhaust channel 101, so that the energy-absorbing elements are arranged more conveniently and freely in the housing, and the arrangement is simpler.

[0038] In one embodiment of the present application, as in Fig. As shown in Figure 9, energy-absorbing elements can be placed on both sides of the explosion-proof valves in a longitudinal direction (the left and right directions, as shown in Figure 9). Fig. (9 shown) and the distance between the two energy-absorbing elements 12, located on both sides of the vent openings 111, can be the first distance “b”, and the first distance b is 1.35 to 2 times the length of the explosion-proof valve 201. By adjusting the distance between the energy-absorbing elements 12 on both sides of the vent openings 111, the exhaust channels 101 formed between the energy-absorbing elements 12 can have sufficient exhaust space so that the high-temperature gas can be better discharged from the exhaust channels 101 during expulsion. In addition, this arrangement can reduce the force transmitted by the energy-absorbing elements 12 to the welded part of the explosion-proof valves 201 under the influence of the impact force, thereby better protecting the battery cells 200.The first distance “b” can, for example, be 1.4 times, 1.45 times, 1.5 times, 1.55 times, 1.6 times, etc., the length of the explosion-proof valves 201. Preferably, the first distance is 1.5 times the length of the explosion-proof valves 201.

[0039] In one embodiment of the present application, as in Fig. As shown in Figure 9, the dimension of the energy-absorbing element 12 in the first direction can be a first length "a", which is 0.45-1.0 times the first distance "b", and the thickness "c" of the energy-absorbing element 12 in the top-bottom direction is 0.12-0.35 times the first length "a". Thus, the length and thickness of the energy-absorbing element 12 are set so that the energy-absorbing elements 12 can meet the installation and design requirements during assembly. Furthermore, the energy-absorbing elements 12 can have a larger contact area and good support for the battery cells 200. For example, the first length “a” can be 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, etc. times the first distance “b”, and the thickness “c” of the energy-absorbing element 12 in the up-down direction can be 0.14, 0.18, 0.2, 0.22, 0.24, 0.26, etc. times the first length “a”.Preferably the first length a is 0.7 times the first distance “b” and the thickness “c” of the energy-absorbing element 12 in the top-bottom direction is 0.2 times the first length “a”.

[0040] In one embodiment of the present application, as in Fig. As shown in Figure 9, the distance between the energy-absorbing element 12 and the circumference of the vent opening 111 in the longitudinal direction of the explosion-proof valve can be the second distance “d”, and the second distance “d” is 0.25-0.45 times the length of the explosion-proof valve 201.Thus, the distance between the energy-absorbing element 12 and the circumference of the vent opening 111 is set, and the distance between the energy-absorbing element 12 and the explosion-proof valve 201 is set so that the energy-absorbing elements 12 can provide better support and protection for the explosion-proof valves 201, and when the battery cells 200 are supported, the damage to the welded part of the explosion-proof valves 201 caused by the energy-absorbing elements 12 can be reduced, and the penetration quantity at the explosion-proof valves 201 can be kept below the limited value when an external ball impacts, so that the battery pack 1000 has better safety-related performance. The second distance “d” can be, for example, 0.25, 0.35, 0.45, etc. times the length of the explosion-proof valve 201.Preferably the second distance d is 0.35 times the length of the explosion-proof valve 201.

[0041] In one embodiment of the present application, which in Fig. As shown in Figure 9, the horizontal distance between the energy-absorbing element 12 and the explosion-proof valve 201 is greater than or equal to 10 mm. This allows the distance between the energy-absorbing element 12 and the explosion-proof valve 201 to be further defined, so that the energy-absorbing elements 12 can better ensure the protective effect of the welded part of the explosion-proof valve 201 after installation, and the battery pack 1000 exhibits improved safety-related performance. For example, the distance between the energy-absorbing element 12 and the explosion-proof valve 201 can be 10 mm, 11 mm, or 12 mm, etc. Preferably, the distance between the energy-absorbing element 12 and the explosion-proof valve 201 is 10 mm.

[0042] In some embodiments of the present application, the base plate 11 can be made of aluminum or steel; the base plate 13 can be made of steel; and the energy-absorbing elements 12 can be made of a foam or a woven mesh element. Since the base plate 11 is made of aluminum or steel and the base plate 13 is made of steel, the base plate 11 and the base plate 13 have good structural strength. The energy-absorbing elements 12 are made of a foam or a woven mesh element, so that the energy-absorbing elements 12 exhibit good structural strength and toughness.The base plate assembly 10, which is integrally formed by the base plate 11, the base protection plate 13, and the energy-absorbing elements 12, exhibits good support strength and structural rigidity, thus providing good protection for the battery pack 1000 and improving its safety performance. Optionally, the energy-absorbing elements can be made of polypropylene, polyolefins, vinyl polymers, polyethylene, polypropylene, polypropylene-glass fibers, resin-glass fibers, or MPP foam (microcellular polypropylene foam). Preferably, the base plate 11 is made of aluminum, the base protection plate 13 of hot-formed steel sheet, and the energy-absorbing element 12 of MPP foam.

[0043] In some embodiments of the present invention, as in the Fig. 8 and Fig. As shown in Figure 9, the base plate 11, the energy-absorbing elements 12, and the base plate 13 are bonded together. This simplifies the assembly and fastening of the base plate assembly 10. Furthermore, the overall structure of the base plate assembly 10 is made more compact, and the base plate assembly 10 exhibits improved overall rigidity, thus providing better support and protection for the battery cells 200.

[0044] In some embodiments of the present application, as in the Fig. 3 and Fig. As shown in Figure 4, a protective layer 131 can be applied to the surface of the side of the base plate 13 facing away from the energy-absorbing elements 12. This can give the base plate 13 good corrosion and aging protection properties and increase its durability. Optionally, the protective layer 131 can be a PVC (polyvinyl chloride) coating, a PP coating, etc.

[0045] The housing 100 according to the second embodiment of the present application is below referred to by reference to the Fig. 1-19 described.

[0046] As in the Fig. As shown in Figures 1-19, the housing 100 according to the embodiment of the present application has a frame and a base plate arrangement 10 according to the first embodiment of the present application, wherein the base plate arrangement 10 is connected to the bottom of the frame.

[0047] The other structures and functions of the housing 100 according to the embodiment of the present application are known to the person skilled in the art and are not described in detail here.

[0048] According to the housing 100 of the embodiment of the present application, which is provided with the base plate arrangement 10 of the embodiment of the first aspect mentioned above, a plurality of energy-absorbing elements 12 are arranged at intervals. The energy-absorbing elements 12 have a plurality of energy-absorbing holes 1211, and the energy-absorbing elements 12 interact with the base plate 11 and the base protection plate 13 to define the outlet channels 101, so that the battery pack 1000 has better performance in protecting the ground, better vibration reduction and buffering, and better safety-related performance. In addition, the structure of the base plate arrangement 10 is more compact, so that the energy density of the battery pack 1000 is improved to a certain extent.

[0049] The battery pack 1000 according to the third embodiment of the present application is referred to below with reference to the Fig. 1-19 described.

[0050] As in the Fig. Figures 1-19 show that the battery pack 1000, according to the embodiment of the present application, comprises a plurality of battery cells 200 and a housing 100, according to the second embodiment of the present application. The plurality of battery cells 200 is arranged in the housing 100 and is supported by the base plate arrangement 10. The explosion-proof valves 201 of the plurality of battery cells 200 are all arranged facing the base plate arrangement 10.

[0051] According to the embodiment of the present application, which is provided with the housing 100 of the second embodiment, a plurality of energy-absorbing elements 12 are arranged at intervals. The energy-absorbing elements 12 have a plurality of energy-absorbing holes 1211, and the energy-absorbing elements 12 interact with the base plate 11 and the base protection plate 13 to define the outlet channels 101. This results in the battery pack 1000 having improved performance in protecting the ground, better vibration reduction and buffering, and improved safety. Furthermore, the structure of the base plate arrangement 10 is more compact, thus improving the energy density of the battery pack 1000 to a certain extent.

[0052] In some embodiments of the present application, the battery pack 1000 may further comprise a liquid cooling plate 300, which is provided in the housing 100 and arranged on a plurality of battery cells 200, and the liquid cooling plate 300 is bonded to the plurality of battery cells 200. The liquid cooling plate 300 is provided so that the battery cells 200 in the battery pack 1000 can receive good cooling and heat dissipation, enabling the battery pack 1000 to perform charging and discharging operations stably and efficiently. Furthermore, good heat dissipation and cooling can significantly reduce the possibility of thermal runaway of the battery pack 1000, thus improving the battery pack 1000's safety-related performance. Preferably, the liquid cooling plate 300 is bonded to the plurality of battery cells 200 by a thermally conductive structural adhesive.

[0053] In some embodiments of the present application, the battery pack 1000 may further comprise a battery management system 400 and a battery energy distribution system 500, and the battery management system 400 and the battery energy distribution system 500 are provided in the housing 100. The battery management system 400 can safely and optimally control the individual cells in the battery pack 1000 to ensure that the battery pack 1000 can operate safely, reliably, and stably. The battery energy distribution system 500 can effectively control and protect the charging and discharging of the battery pack 1000 for the vehicle, thereby further improving the safety of the battery pack 1000.

[0054] A battery pack 1000 according to a specific embodiment of the present application is described with reference to the Fig. 1 to 19 described.

[0055] As in the Fig. As shown in Figures 1 to 19, the battery pack 1000 comprises a plurality of battery cells 200, a housing 100, a liquid cooling plate 300, a battery management system 400, and a battery power distribution system 500. The housing 100 has a base plate assembly 10; a plurality of battery cells 200 are provided in the housing 100 and mounted on the base plate assembly 10; the explosion-proof valves 201 of the plurality of battery cells 200 are all arranged facing the base plate assembly 10; the liquid cooling plate 300 is provided on the plurality of battery cells 200 and connected and fastened to the plurality of battery cells 200 by a thermally conductive structural adhesive; the battery management system 400 and the battery power distribution system 500 are both arranged in the housing 100.

[0056] The base plate assembly 10 comprises a base plate 11, a base plate 13, and energy-absorbing elements 12. The base plate 11 is located on the underside of the plurality of battery cells 200 and is provided with vent openings 111 that are connected to the explosion-proof valves 201. The base plate 13 is located on the underside of the base plate 11. The energy-absorbing elements 12 are located between the base plate 11 and the base plate 13, and a plurality of energy-absorbing elements 12 are provided. A plurality of energy-absorbing elements 12 are provided at intervals in the horizontal plane and interact with the base plate 11 and the base plate 13 to define outlet channels 101. The outlet channels 101 are connected to the vent openings 111. The base of the base plate 13 is provided with a protective layer 131.

[0057] With reference to Fig. In the left-right direction, the first distance “b” between two adjacent energy absorption elements 12 is 1.5 times the length of the explosion-proof valve 201, the first length “a” of the energy absorption element 12 is 0.7 times the first distance “b”, the thickness “c” of the energy absorption element 12 is 0.2 times the first length “a”, and the second distance “d” between the energy absorption element 12 and the circumference of the vent opening 111 is 0.35 times the length of the explosion-proof valve 201. With reference to Fig. 11 is the cross-section of the energy-absorbing hole 1211 in the energy-absorbing element 12 a hexagon, wherein the first dimension “s1” is 0.2 times the length of the explosion protection valve 201 and the second dimension “s2” is 0.5 times the length of the explosion protection valve 201.

[0058] As in the Fig. 18 and Fig. 19 shown, is Fig. 18 a diagram of the position of the ball impact support strip structure in the structure of the conventional floor slab arrangement 10, and Fig. Figure 19 is a diagram of the position of the ball impact energy absorption elements 12 in the base plate arrangement 10 of the present embodiment, wherein in the test a steel ball with an energy of 100 J and a diameter of 25 mm was used to simulate the road gravel by the ball impact.

[0059] In the test, after the ball impacts the position of the impact strip in the structure of the conventional base plate arrangement 10, the penetration of the battery cells 200 into the housing is 4.361 mm; after the ball impacts the position of the energy-absorbing elements 12 of the base plate arrangement 10 of the present embodiment, the penetration of the battery cells 200 into the housing is 1.812 mm. The degree of housing penetration refers here to the depth into the housing of the battery cells 200 that have sunk under the influence of an external force, whereby the degree of housing penetration of the battery cells 200 must generally be kept below 2 mm.

[0060] The test results show that the base plate arrangement 10 of the present embodiment has significantly improved the ground protection effect of the battery pack 1000. The structure of the base plate arrangement 10, which consists of the ground protection plate 13, the energy-absorbing elements 12 and the base plate 11, can better meet the requirements for ground protection of the battery pack 1000, so that the battery pack 1000 has good ground protection and thus exhibits better safety-related performance.

[0061] According to the base plate arrangement 10 of the embodiment of the present application, a plurality of energy-absorbing elements 12 are arranged at intervals, wherein the energy-absorbing elements 12 have a plurality of energy-absorbing holes 1211, and the energy-absorbing elements 12 interact with the base plate 11 and the base protection plate 13 to define the outlet channels 101, so that the battery pack 1000 has better base protection performance and vibration reduction and a buffering effect, thus improving the safety-related performance of the battery pack 1000. In addition, the structure of the base plate arrangement 10 is more compact, so that the energy density of the battery pack 1000 is improved to some extent.

[0062] In the description of the present application, it should be noted that the terms "middle", "longitudinal", "lateral", "length", "width", "thickness", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "outer perimeter" and the like indicate the orientation or positional relationship based on the orientation or positional relationship in the drawings, which serve only to simplify the description of the present application and do not mean or imply that the device or element in question must have a particular orientation, be constructed and operated in a particular orientation and therefore cannot be understood as a limitation of the present application.

[0063] Furthermore, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying a relative meaning or implying the number of the specified technical features. Therefore, the features defined as “first” and “second” may explicitly or implicitly include one or more of the features. In the description of this application, “several” means two or more unless clearly and specifically defined otherwise.

[0064] In the present application, the terms "install", "connect", "connect", "fasten", and similar terms are to be understood in a broad sense unless explicitly specified and limited. For example, they may refer to a permanent connection, a detachable connection, or an integral connection; a mechanical connection, an electrical connection, or communication; a direct connection or an indirect connection via an intermediate medium; or the internal connection of two elements or the interaction relationship between two elements. The specific meanings of the aforementioned terms in the present application are understandable to those skilled in the art, based on the specific circumstances.

[0065] In the description of this specification, the description of the reference terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or properties described in connection with the embodiment or example are present in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials, or properties may be combined appropriately in one or more embodiments or examples.Furthermore, experts in this field, provided there are no contradictions, can combine and link different embodiments or examples described in this description, as well as the features of different embodiments or examples.

[0066] Although embodiments of the present application have been shown and described, it will be clear to the person skilled in the art that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] CN 202321043365.3

[0001]

Claims

[1] Base plate assembly attached to a housing of a battery pack, wherein the base plate assembly is designed to support battery cells, wherein explosion-proof valves of the battery cells are arranged in the direction of the base plate assembly, characterized by , that the floor slab arrangement has the following features: a base plate which has vent openings connected to the explosion-proof valves; a floor protection plate that is arranged on the underside of the floor plate; Energy-absorbing elements arranged between the base plate and the base plate, wherein a plurality of energy-absorbing holes are formed in the energy-absorbing elements, a plurality of energy-absorbing elements are provided, and the plurality of energy-absorbing elements are arranged at intervals in a horizontal plane, and the base plate, the base plate, and the plurality of energy-absorbing elements interact to define outlet channels that are connected to the vent openings. [2] Floor plate arrangement according to claim 1, characterized by that the cross-section of the energy-absorbing hole is circular or polygonal. [3] Floor plate arrangement according to claim 1 or 2, characterized by that the cross-section of the energy-absorbing hole is a narrow rectangle, a wide rectangle, a pentagon, or a hexagon. [4] Floor plate arrangement according to one of the preceding claims, characterized by , that the multitude of energy-absorbing holes in a matrix are arranged in the horizontal plane. [5] Floor plate arrangement according to one of the preceding claims , characterized by , that the energy-absorbing element comprises: a main body and a membrane layer, the energy-absorbing holes are formed on the main body and penetrate the main body in the top-bottom direction, and two membrane layers are provided, the two membrane layers being provided on both sides of the main body in the top-bottom direction and connected to a top surface and a bottom surface of the main body. [6] Floor plate arrangement according to one of the preceding claims, characterized bythat the energy-absorbing elements are arranged on both sides of the vent openings in a longitudinal or a transverse direction of the housing, wherein the two energy-absorbing elements arranged on both sides of the vent openings interact with the base plate and the lower protective plate to define the outlet channels. [7] Floor plate arrangement according to claim 6, characterized by , that in the horizontal plane the distance between the energy-absorbing element and the explosion-proof valve is greater than or equal to 10 mm. [8] Floor plate arrangement according to claim 7, characterized by that the distance is 10 mm, 11 mm or 12 mm. [9] Floor plate arrangement according to one of the preceding claims, characterized by that the energy-absorbing elements are a foam element or a woven mesh element. [10] Floor plate arrangement according to claim 9, characterized bythat the energy-absorbing elements are made of polypropylene, polyolefins, vinyl polymers, polyethylene, polypropylene, polypropylene glass fibers, resin glass fibers and / or MPP foam (microcellular polypropylene foam). [11] Floor plate arrangement according to one of the preceding claims, characterized by that the base plate is made of aluminium, the floor protection plate of hot-formed sheet steel and the energy-absorbing element of MPP foam. [12] Floor plate arrangement according to one of the preceding claims, characterized by that the surface of the floor protection plate is provided with a protective layer on the side facing away from the energy-absorbing elements. [13] Floor plate arrangement according to claim 12, characterized by that the protective layer is a PVC (polyvinyl chloride) coating or a PP coating. [14] Housing, characterized bythat it comprises a frame and the base plate arrangement according to one of the preceding claims, wherein the base plate arrangement is connected to the bottom of the frame. [15] Battery pack, characterized by , that it comprises a plurality of battery cells and a housing according to claim 14, wherein the plurality of battery cells is arranged in the housing and supported by the base plate arrangement and the explosion-proof valves of the plurality of battery cells are all arranged in the direction of the base plate arrangement. [16] Battery pack according to claim 15, characterized by , that it also has a liquid cooling plate. [17] Battery pack according to claim 15 or 16, characterized by , furthermore comprising a battery management system and a battery power distribution system, wherein the battery management system and the battery power distribution system are arranged in the housing. [18] vehicle, characterized by, that it comprises a battery pack according to one of claims 15 to 17.

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