Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device, the battery device comprises a battery box and a battery monomer assembly, the battery box is provided with an accommodating cavity, and the battery box comprises a bottom plate; the battery monomer assembly comprises a plurality of battery monomers, the battery monomer assembly is accommodated in the accommodating cavity, and the bottom plate bears the battery monomer assembly from one side of the first direction; the bottom plate comprises a main bearing plate body part and a reinforcing part, the thickness direction of the main bearing plate body part is consistent with the first direction, at least one end of the main bearing plate body part along the second direction is connected with the reinforcing part, the second direction is crossed with the first direction, and the second direction is projected to the same plane along the first direction; the projection of the main bearing plate body part is within the projection range of the battery monomer assembly, at least part of the projection of the reinforcing part is within the projection range of the battery monomer assembly, and in the first direction, the size of the reinforcing part is larger than that of the main bearing plate body part. According to the battery device and the power utilization device, the structural stability is improved, and the weight is reduced.

Description

Technical Field

[0001] This application relates to battery technology, and more particularly to a battery device and an electrical device. Background Technology

[0002] The application of new energy batteries in daily life and industry is becoming increasingly widespread. For example, new energy vehicles equipped with batteries are already widely used, and batteries are also increasingly being applied in energy storage. In new energy vehicles equipped with batteries, the batteries can provide all or part of the power. In the field of energy storage, batteries can be installed in energy storage boxes or directly on the user side.

[0003] Improving the structural stability of battery devices and reducing their weight are problems that the industry needs to solve. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a battery device and an electrical device for improving structural stability and reducing weight.

[0005] The technical solution of this application embodiment is implemented as follows:

[0006] The first aspect of this application provides a battery device, comprising: a battery case having a receiving cavity, the battery case including a base plate; a battery cell assembly including a plurality of battery cells, the battery cell assembly being received within the receiving cavity, the base plate supporting the battery cell assembly from one side in a first direction; wherein the base plate includes a main support plate portion and a reinforcing portion, the thickness direction of the main support plate portion being consistent with the first direction, the reinforcing portion being connected to at least one end of the main support plate portion along a second direction, the second direction intersecting the first direction and projecting onto the same plane along the first direction, the projection of the main support plate portion being within the projection range of the battery cell assembly, and at least a portion of the projection of the reinforcing portion being within the projection range of the battery cell assembly, and in the first direction, the size of the reinforcing portion being larger than the size of the main support plate portion.

[0007] In the embodiments of this application, by providing a main support plate and a reinforcing portion in the base plate, and ensuring that at least a portion of the projection of the reinforcing portion is within the projection range of the battery cell assembly, the load-bearing capacity of the base plate for the battery cell assembly is improved, and the probability of base plate deformation is reduced. Furthermore, the reinforcing portion is larger in size in the first direction than the main support plate, enhancing local structural rigidity and improving the structural stability of the base plate. Therefore, the battery box in the embodiments of this application exhibits relatively high structural stability. Moreover, since the local portion of the base plate (the main support plate) is relatively thin, it also helps to reduce the weight of the battery box, thereby facilitating the lightweighting of the battery device.

[0008] In some embodiments, the base plate further includes a connecting portion, which is connected to one end of the reinforcing portion away from the main support plate body in a second direction and projected into the same plane in a first direction. The projection of the connecting portion is outside the projection range of the battery cell assembly. In the first direction, the size of the connecting portion is larger than the size of the main support plate body. The connecting portion is used to connect electrical equipment.

[0009] By incorporating a connecting portion and connecting it to the reinforcing portion, the base plate not only serves a load-bearing function but also functions as a connector between the battery pack and external electrical equipment. Furthermore, since the connecting portion is located at the end of the reinforcing portion away from the main load-bearing plate along the second direction, the reinforcing portion is positioned within the force transmission path when the battery pack is connected to the electrical equipment, thus enhancing its strength and structural stability. Additionally, the projection of the connecting portion along the first direction lies outside the projection range of the individual battery cells, reducing the impact of the connecting portion on the arrangement of the individual battery cells. Moreover, in the first direction, the minimum dimension of the connecting portion is greater than the maximum dimension of the main load-bearing plate, resulting in higher strength and rigidity for the connecting portion, thereby improving the assembly reliability and structural stability of the battery pack.

[0010] In some embodiments, the connecting part includes a first part and a second part. One end of the first part is connected to a reinforcing part along a second direction, and the other end is connected to the second part. In the first direction, the size of the second part is greater than or equal to the size of the first part. The battery box also includes a mounting member connected to the second part. The mounting member is used to connect electrical equipment.

[0011] In the embodiments of this application, by making the connecting portion include a first portion and a second portion, and making the dimension of the second portion along the first direction greater than or equal to that of the first portion, the structural strength and connection reliability of the connecting portion are further enhanced. Furthermore, the mounting member is disposed on the second portion, enabling a more stable connection with external electrical equipment, thereby improving the structural stability and installation stability of the battery device.

[0012] In some embodiments, in the first direction, the ratio of the size of the second part to the size of the first part is greater than or equal to 1.5 and less than or equal to 5.

[0013] Thus, by limiting the ratio of the dimensions of the second part to the first part to be greater than or equal to 1.5 and less than or equal to 5, the connection can meet structural strength requirements without excessively increasing material usage, thereby achieving a better balance between lightweighting and structural strength. Furthermore, the dimensional changes between the two parts are not too large, reducing the risk of stress concentration at various points along the connection steps.

[0014] In some embodiments, the reinforcing portion includes a first plate portion and a second plate portion. One end of the first plate portion is connected to the main bearing plate portion along the second direction, and the other end is connected to the second plate portion. The thickness direction of the first plate portion is consistent with the first direction, and the thickness direction of the second plate portion is consistent with the second direction.

[0015] The thickness direction of the first plate portion is consistent with the first direction, and the thickness direction of the second plate portion is consistent with the second direction. That is, the plate formed by the first plate portion and the second plate portion is a bent plate. In this way, the load-bearing capacity of the battery cell assembly along the first direction can be improved, and the use of materials can be reduced, thereby facilitating weight reduction.

[0016] In some embodiments, the ratio of the thickness of the first plate portion to the thickness of the main bearing plate portion is greater than or equal to 1.5 and less than or equal to 5.

[0017] Thus, by limiting the ratio of the thickness of the first plate to the thickness of the main load-bearing plate to be greater than or equal to 1.5 and less than or equal to 5, the first plate can meet structural strength requirements without excessively increasing material usage, thereby achieving a better balance between lightweighting and structural strength. Furthermore, the thickness variation between the two plates is not too large, reducing the risk of stress concentration at the connection steps.

[0018] In some embodiments, the reinforcing portion is configured as a second plate portion whose thickness direction is aligned with the second direction.

[0019] The thickness direction of the main bearing plate is consistent with the first direction, and the thickness direction of the second plate is consistent with the second direction. That is, the plate formed by the main bearing plate and the second plate is a bent plate. In this way, the load-bearing capacity of the battery cell assembly along the first direction can be improved, and the use of materials can be reduced, which is conducive to weight reduction.

[0020] In some embodiments, the ratio of the thickness of the second plate portion to the thickness of the main bearing plate portion is greater than or equal to 1.5 and less than or equal to 5.

[0021] Thus, by limiting the ratio of the thickness of the second plate to the thickness of the main load-bearing plate to be greater than or equal to 1.5 and less than or equal to 5, the second plate can meet structural strength requirements without excessively increasing material usage, thereby achieving a better balance between lightweighting and structural strength. Furthermore, the thickness variation between the two plates is not too large, reducing the risk of stress concentration at the connection step.

[0022] In some embodiments, the base plate further includes a plate-shaped connecting portion, which is connected to one end of the second plate portion away from the main bearing plate portion. The connecting portion is used to connect electrical equipment, and the thickness direction of the connecting portion is consistent with the first direction. The thickness of the connecting portion is greater than or equal to the thickness of the second plate portion.

[0023] Thus, by setting a connecting part and making its thickness direction consistent with the first direction, and the thickness of the connecting part being greater than or equal to the thickness of the second plate part, the load-bearing capacity of the connecting part can be improved, making it less prone to deformation or breakage when subjected to large loads, thereby improving the structural reliability of the entire battery device.

[0024] In some embodiments, at least one of the main bearing plate, the reinforcing portion, and the connecting portion has a thickness of 6 mm or more, and the portion with a thickness of 6 mm or more is configured as a hollow structure with a cavity filled with foam; and / or, the thickness of the main bearing plate, the reinforcing portion, and the connecting portion is all less than 6 mm, and the main bearing plate, the reinforcing portion, and the connecting portion are configured as solid structures.

[0025] Thus, by using a hollow structure filled with foam in areas with a thickness of 6 mm or more, weight can be further reduced while maintaining good mechanical properties, provided that structural strength is met. Solid structures are used in areas with a thickness less than 6 mm to ensure structural strength requirements are met.

[0026] In some embodiments, when projected along a first direction into the same plane, the overlapping portion of the projection of the reinforcing portion and the projection of the battery cell assembly in the second direction has a dimension greater than or equal to 5 mm and less than or equal to 20 mm.

[0027] In this way, by limiting the range of values ​​for the overlapping dimensions of the reinforcing part and the battery cell assembly in the second direction, the reinforcing part can effectively support the battery cell assembly while minimizing the use of materials.

[0028] In some embodiments, the thickness of the main bearing plate is greater than or equal to 1 mm and less than or equal to 2.5 mm.

[0029] In this way, by setting the thickness range of the main load-bearing plate, it can meet the basic load-bearing requirements without adding unnecessary weight due to excessive thickness, which is conducive to the lightweighting of the battery device.

[0030] In some embodiments, the main load-bearing plate, the reinforcing part, and the connecting part are formed as an integrally molded structure.

[0031] In this way, by forming the main load-bearing plate, the reinforcing part and the connecting part into an integral molded structure, the number of parts and assembly steps can be effectively reduced, and production efficiency and structural reliability can be improved.

[0032] In some embodiments, at least a portion of the base plate is made of a continuous fiber composite material.

[0033] Continuous fiber composites possess high strength and stiffness, meeting the strength and stiffness requirements of the base plate. Furthermore, their lightweight properties contribute to weight reduction in battery devices. Moreover, continuous fiber composites do not suffer from rusting issues, and their manufacturing process is relatively environmentally friendly, helping to reduce carbon emissions. Therefore, using continuous fiber composites for at least some parts of the base plate (e.g., the main load-bearing plate, reinforcement sections, and connecting sections) offers advantages such as light weight, high strength, and corrosion resistance, making them particularly suitable for applications such as aircraft where structural weight and strength requirements are high.

[0034] In some embodiments, the base plate includes multiple layers of continuous fiber composite material, each layer of which includes continuous fibers and a thermosetting resin matrix, the thermosetting resin matrix connecting the continuous fibers.

[0035] Continuous fiber composite layers formed using continuous fibers and thermosetting resin matrices possess high strength, high rigidity, and high toughness, which helps to improve the structural strength and rigidity of the base plate. Furthermore, by stacking multiple layers of continuous fiber composite materials, the mechanical properties and thermal stability of the plate can be further enhanced, meeting the requirements for use in complex environments.

[0036] In some embodiments, the continuous fiber is carbon fiber, and the base plate is connected to an insulating layer at least on the surface in contact with the battery cell assembly.

[0037] This design, by placing an insulating layer at a specific location on the base plate, can effectively reduce the risk of electrical conductivity between the battery cell assembly and the carbon fiber, making it particularly suitable for high-voltage or high-current operating environments.

[0038] In some embodiments, the battery box further includes end plates, with end plates connected to both ends of the main support plate body along a third direction. A receiving cavity is formed between the two end plates. The third direction intersects both the first direction and the second direction. A second plate body is provided at both ends of the main support plate body along the second direction. The second plate body extends relative to the main support plate body along the first direction toward the side away from the receiving cavity and is connected between the two end plates. The battery box further includes a bottom guard plate, which is provided on the side of the bottom plate away from the receiving cavity. The portion of the bottom plate between the two second plate bodies, the two second plate bodies, the two end plates, and the bottom guard plate form a venting cavity. The main support plate body has a vent hole that extends through the first direction. The vent hole is closed by a sealing member. When the pressure or temperature on the sealing member reaches a predetermined threshold, the vent hole opens.

[0039] The thickness direction of the second plate portion is consistent with the second direction. The second plate portion extends relative to the main support plate portion along the first direction toward the side facing away from the receiving cavity. This allows the two second plate portions, together with the bottom protective plate, the portion of the bottom plate between the two second plate portions, and the two end plates, to form a relatively large venting cavity on the side of the main support plate portion facing away from the receiving cavity. This allows the vented material from the battery cell assembly after thermal runaway to enter the venting cavity, reducing the impact on the wiring harness and piping within the receiving cavity. Furthermore, the reinforcement portion prevents deformation of the portion of the bottom plate that abuts against the battery cell assembly (at least a portion of the main support plate portion and the reinforcement portion), improving the structural stability of the venting cavity and thus enhancing the reliability of venting.

[0040] In some embodiments, at least one end plate is formed with an exhaust channel communicating with a venting chamber, and a pressure relief mounting port is formed on the wall of the end plate opposite to the receiving chamber. The battery box also includes a first pressure relief mechanism installed at the pressure relief mounting port.

[0041] In this way, the venting material emitted by the battery cell can enter the venting chamber through the vent hole and then accumulate in the venting channel. When the pressure or temperature of the venting channel reaches a predetermined threshold, at least a part of the first pressure relief mechanism will rupture, break, tear or open, so that the venting material can be discharged through the first pressure relief mechanism, thereby reducing the internal pressure and temperature and reducing the risk of the battery device exploding.

[0042] In some embodiments, a portion of the venting chamber is located between two end plates, and another portion is located on the side of the end plate facing the bottom guard plate along a first direction. At least one end plate has a first cavity, a second cavity, and a third cavity. The first cavity is located on the side of the second cavity that is close to the venting chamber along a third direction, and a first through hole communicating with the venting chamber is formed in the cavity wall of the first cavity that is away from the second cavity along a third direction. A first wall separates the first cavity and the second cavity, and a second through hole is formed in the first wall. The third cavity is located on the side of the second cavity that is away from the venting chamber along a first direction. A third through hole communicating with the venting chamber is formed in the cavity wall of the second cavity that is away from the third cavity along a first direction. A second wall separates the second cavity and the third cavity, and a fourth through hole is formed in the second wall. A pressure relief installation port is formed in the cavity wall of the third cavity that is away from the receiving cavity along a third direction. The first through hole, the first cavity, the second through hole, the second cavity, the third through hole, the fourth through hole, the third cavity, and the pressure relief installation port constitute an exhaust flow channel.

[0043] In this way, by setting multiple cavities and through holes inside the end plate to form an exhaust channel, the thermal runaway gas can be discharged in stages, the pressure can be released gradually, the probability of instantaneous high pressure impact can be reduced, and the stability of the battery device can be improved.

[0044] In some embodiments, when projected onto the same projection plane along a third direction, the projection of the first through hole and the projection of the second through hole have an overlapping portion; when projected onto the same projection plane along a first direction, the projection of the third through hole and the projection of the fourth through hole have an overlapping portion.

[0045] In this way, by setting the projection overlap relationship of the through holes in different directions, the gas flow path can be optimized, the flow resistance can be reduced, and the exhaust efficiency can be improved, thereby quickly releasing pressure in the event of thermal runaway and improving the operational reliability of the battery device.

[0046] In some embodiments, the battery box further includes a flow guide shroud, which includes a shroud body and a flow guide tube body connected together. The shroud body is connected to an end plate with a pressure relief installation port and covers the outside of the first pressure relief mechanism. The shroud body and the end plate form a confluence cavity. One end of the flow guide tube body is connected to the confluence cavity, and the other end forms an exhaust port.

[0047] In this way, by setting up a flow guide and its flow guide tube, the thermal runaway gas can be effectively guided to be discharged in a designated direction, reducing the probability of the gas spreading to other sensitive areas, thereby reducing the risk of damage to surrounding components and improving the operational reliability of the battery device.

[0048] In some embodiments, a plurality of first pressure relief mechanisms are installed on the same end plate, and a cover is provided on the outside of at least two of the first pressure relief mechanisms.

[0049] Thus, by installing multiple first pressure relief mechanisms on one end plate and uniformly covering them with a flow guide, exhaust capacity and efficiency can be improved, while simplifying the structural design and facilitating maintenance and replacement.

[0050] In some embodiments, the battery box further includes a vent seal that seals between the cover portion and the end plate.

[0051] Thus, by setting an exhaust seal between the cover and the end plate, the sealing performance of the exhaust channel can be improved, the probability of gas leakage can be reduced, thereby improving the efficiency of venting, and the probability of gas leakage during the emission process can be reduced, thereby reducing the impact of leaked high-temperature gas on the wiring harnesses and pipelines around the battery device.

[0052] In some embodiments, the cover and / or the guide tube are made of titanium alloy.

[0053] Thus, by using titanium alloy materials to make the cover and / or guide tube, its high temperature resistance and corrosion resistance can be significantly improved, its service life can be extended, and it also has good mechanical strength.

[0054] In some embodiments, the cover portion and the end plate are connected by fasteners.

[0055] Thus, since the instantaneous air pressure is large during thermal runaway, the connection between the cover and the end plate can be strengthened by using fasteners to reduce the risk of the fairing falling off, and it is also easy to disassemble and maintain.

[0056] In some embodiments, the cover portion includes a first cover wall opposite to the first pressure relief mechanism in a third direction, and the distance between the first cover wall and the first pressure relief mechanism in a third direction is greater than or equal to 15 mm.

[0057] Thus, by setting the range of the distance between the first cover wall and the first pressure relief mechanism, a sufficiently large space is provided for the first pressure relief mechanism to eject, so as to meet the exhaust volume requirements of the first pressure relief mechanism, allowing the gas to be discharged smoothly and improving the efficiency of gas release.

[0058] A second aspect of this application provides an electrical device that includes a plurality of battery devices provided in the first aspect, the battery devices being used to store or provide electrical energy.

[0059] Because the electrical device includes a battery device and incorporates all the beneficial effects of the battery device, the electrical device has high structural stability and is relatively lightweight.

[0060] In some embodiments, the electrical device is an aircraft.

[0061] In this way, the aircraft has high structural stability and is relatively lightweight.

[0062] The beneficial effects of the embodiments disclosed herein include: providing a battery device and an electrical device with high structural stability and light weight. Attached Figure Description

[0063] Figure 1 A schematic diagram of the structure of an electrical device (aircraft) according to one or more embodiments;

[0064] Figure 2 An exploded perspective view of a structure of a battery device according to one or more embodiments;

[0065] Figure 3 This is a perspective structural diagram of another structure of a battery device according to one or more embodiments;

[0066] Figure 4 for Figure 3 3D exploded view of the middle box;

[0067] Figure 5 An exploded perspective view of two connected boxes according to one or more embodiments;

[0068] Figure 6 This is a top view of a battery device according to one or more embodiments with the case cover removed.

[0069] Figure 7 for Figure 6 A cross-sectional view at point AA;

[0070] Figure 8 for Figure 6 Another sectional view at point AA;

[0071] Figure 9 for Figure 6 Sectional view at point BB;

[0072] Figure 10 This is an exploded perspective view of a battery cell according to one or more embodiments.

[0073] Explanation of reference numerals in the attached figures

[0074] 1000. Aircraft; 100. Battery unit; 200. Airframe; 10. Battery box; 101. Box body; 102. Box cover; 1. Base plate; 11. Main load-bearing plate; 12. Reinforcing part; 121. First plate; 122. Second plate; 13. Connecting part; 131. First part; 132. Second part; 2. Battery cell assembly; 20. Battery cell; 201. Outer shell; 2011. End cap; 2012. Shell; 202. Second pressure relief mechanism; 203. Electrode assembly; 3. Mounting component; 30. Connecting 31. Connecting hole; 31. Main body; 311. Base body; 312. Ear; 32. Boss; 4. End plate; 41. First cavity; 411. First through hole; 42. Second cavity; 421. First wall; 422. Second through hole; 423. Third through hole; 43. Third cavity; 431. Second wall; 432. Fourth through hole; 433. Pressure relief installation port; 5. Bottom guard plate; 50. Vent chamber; 6. Sealing component; 7. First pressure relief mechanism; 8. Flow guide cover; 81. Cover body; 82. Flow guide tube body; 80. Merging cavity; 9. Insulation layer; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0075] The embodiments of the technical solutions disclosed herein will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solutions disclosed herein and are therefore intended to limit the scope of protection of this disclosure.

[0076] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure; the terms “comprising” and “having” and any variations thereof in embodiments of this disclosure are intended to cover non-exclusive inclusion.

[0077] In the description of the embodiments of this disclosure, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.

[0078] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0079] In the description of the embodiments of this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0080] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0081] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0082] Currently, new energy batteries are being used more and more widely in daily life and industry. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0083] In related technologies, some battery devices have a relatively thick base plate to ensure that the battery box can support the individual battery cells, but this is not conducive to the lightweighting of the battery device. Furthermore, some battery devices have a thinner base plate to reduce weight, which can easily lead to poor support of the base plate for the individual battery cells, making the battery box prone to deformation and affecting the structural stability of the battery device.

[0084] To this end, this disclosure presents a battery device comprising a battery box and a battery cell assembly. The battery box has a receiving cavity and includes a base plate. The battery cell assembly includes multiple battery cells, which are housed within the receiving cavity. The base plate supports the battery cell assembly from one side in a first direction. The base plate includes a main support plate and a reinforcing portion. The thickness direction of the main support plate is aligned with the first direction. At least one end of the main support plate is connected to the reinforcing portion along a second direction. The second direction intersects the first direction and projects onto the same plane along the first direction. The projection of the main support plate is within the projection range of the battery cell assembly, and at least a portion of the projection of the reinforcing portion is within the projection range of the battery cell assembly. In the first direction, the size of the reinforcing portion is larger than the size of the main support plate.

[0085] In this design, by incorporating a main load-bearing plate and a reinforcing section within the base plate, and ensuring that at least a portion of the reinforcing section's projection falls within the projection range of the battery cell assembly, the base plate's load-bearing capacity for the battery cell assembly is enhanced, reducing the likelihood of base plate deformation. Furthermore, the reinforcing section's dimension in the first direction is larger than that of the main load-bearing plate, increasing local structural rigidity and improving the base plate's structural stability. Therefore, the battery box in this design exhibits relatively high structural stability. Moreover, the relatively thin local portion of the base plate also helps reduce the weight of the battery box, thus contributing to the lightweighting of the battery assembly.

[0086] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0087] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0088] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0089] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0090] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0091] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0092] In some embodiments, the battery device can be applied to a vehicle, and the battery box can be part of the vehicle's chassis structure. For example, a portion of the battery box can be at least a part of the vehicle's floor, or a portion of the battery box can be at least a part of the vehicle's crossbeams and longitudinal beams.

[0093] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0094] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0095] A single battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of the battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0096] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0097] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0098] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0099] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0100] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, a positive electrode active material is filled and / or deposited within the foamed metal.

[0101] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0102] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0103] As an example, the negative electrode sheet may include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0104] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0105] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0106] In some embodiments, the negative electrode can be made of foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not contain a negative electrode active material.

[0107] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0108] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0109] The technical solutions described in the embodiments of this application are applicable to electrical devices that use battery devices. The electrical device includes the battery device of any embodiment of this application, and the battery device is used to provide electrical energy.

[0110] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, aircraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Aircraft generally refer to devices that fly within or outside the atmosphere (space), including aircraft flying within the atmosphere and spacecraft flying in space. Aircraft can include airplanes, airships, etc., for example, low-altitude aircraft, eVTOL (electric vertical take-off and landing) aircraft, commuter aircraft, regional aircraft, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of this application do not impose any special limitations on the above-mentioned electrical devices.

[0111] It should be noted that the technical solutions described in the embodiments of this application are not limited to the electrical devices described above, but can also be applied to all electrical devices including battery devices and energy storage devices. However, for the sake of brevity, the following embodiments are all described using aircraft as an example.

[0112] Figure 1 A schematic diagram of the structure of an electrical device (aircraft) according to one or more embodiments; Figure 2 This is an exploded perspective view of a structure of a battery device according to one or more embodiments.

[0113] Reference Figure 1 The aircraft 1000 typically includes a battery unit 100 and an airframe 200, with the battery unit 100 located in the airframe 200 and providing electrical power to the airframe 200.

[0114] like Figure 2As shown, the battery device 100 includes a battery case 10 and at least one battery cell 20. The battery case 10 has a receiving cavity, in which at least one battery cell 20 is received.

[0115] In some embodiments of this application, the battery box 10 may include a cover 102 and a body 101. The cover 102 and the body 101 are fastened together, forming a receiving cavity inside the battery box 10 to accommodate the individual battery cells 20. This receiving cavity may be sealed or unsealed.

[0116] The housing 101 can be a hollow structure with one open end, and the cover 102 can be a plate-like structure. The cover 102 closes onto the open side of the housing 101 so that the cover 102 and the housing 101 together define the receiving cavity. Alternatively, both the cover 102 and the housing 101 can be hollow structures with one open side, and the open side of the cover 102 closes onto the open side of the housing 101. Of course, the battery box 10 formed by the cover 102 and the housing 101 can be of various shapes, such as a cylinder, a cuboid, etc.

[0117] In the battery device 100, there can be multiple battery cells 20. These multiple battery cells 20 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the assembly of the multiple battery cells 20 is placed in the receiving cavity formed by the housing 101 and the cover 102. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form an assembly, which is then housed in the receiving cavity formed by the housing 101 and the cover 102. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0118] In this embodiment, the battery cell 20 can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0119] The battery cell 20 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0120] As an example, the battery cell 20 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0121] Below, refer to Figures 2 to 10 Some embodiments of this application will be described in detail.

[0122] Figure 3 This is a perspective structural diagram of another structure of a battery device according to one or more embodiments; Figure 4 for Figure 3 3D exploded view of the middle box; Figure 5 An exploded perspective view of two connected boxes according to one or more embodiments; Figure 6 This is a top view of a battery device according to one or more embodiments with the case cover removed. Figure 7 for Figure 6 A cross-sectional view at point AA; Figure 8 for Figure 6 Another sectional view at point AA; Figure 9 for Figure 6 Sectional view at point BB; Figure 10 This is an exploded perspective view of a battery cell according to one or more embodiments.

[0123] In some embodiments of this application, for ease of explanation, a first direction, a second direction, and a third direction are defined. These three directions intersect each other; here, intersecting each other includes perpendicularly intersecting each other. For ease of understanding of the embodiments of this application, in... Figures 2 to 10 In the illustrated embodiments, the first direction, the second direction, and the third direction are given as examples where they intersect each other perpendicularly. However, those skilled in the art should understand that the embodiments of this application are not limited to the case where these three directions intersect each other perpendicularly. For ease of explanation, as follows... Figures 2 to 10 As shown by the arrows, the direction of arrow X is the first direction, the direction of arrow Y is the second direction, and the direction of arrow Z is the third direction. Sometimes, the direction that arrow X points in along the first direction is called "above," and its opposite direction is called "below."

[0124] The first aspect of this application provides a battery device 100, such as Figures 2 to 8As shown, the battery device 100 includes a battery box 10 and a battery cell assembly 2. The battery box 10 has a receiving cavity and includes a base plate 1. The battery cell assembly 2 includes a plurality of battery cells 20 and is housed in the receiving cavity. The base plate 1 supports the battery cell assembly 2 from one side in a first direction X. The base plate 1 includes a main support plate portion 11 and a reinforcing portion 12. The thickness direction of the main support plate portion 11 is consistent with the first direction X. The reinforcing portion 12 is connected to at least one end of the main support plate portion 11 along a second direction Y. The second direction Y intersects the first direction X and is projected onto the same plane along the first direction X. The projection of the main support plate portion 11 is within the projection range of the battery cell assembly 2, and at least a portion of the projection of the reinforcing portion 12 is within the projection range of the battery cell assembly 2. In the first direction X, the size of the reinforcing portion 12 is larger than the size of the main support plate portion 11.

[0125] It is understandable that, in the first direction X, the size of the reinforcing part 12 is larger than the size of the main bearing plate part 11, meaning that, in the first direction X, the minimum size of the reinforcing part 12 is greater than the maximum size of the main bearing plate part 11.

[0126] For example, the battery box 10 includes a cover 102 and a body 101. The cover 102 and the body 101 are fastened together along a first direction X, and the body 101 includes a base plate 1.

[0127] The main load-bearing plate 11 constitutes the main load-bearing part of the base plate 1. Its thickness direction is consistent with the first direction X, and it is used to support the weight of the battery cell assembly 2 and transfer it to the electrical equipment.

[0128] The reinforcing part 12 is a reinforcement structure disposed at the edge of the main load-bearing plate 11 to improve the overall rigidity and deformation resistance of the base plate 1. For example, the reinforcing part 12 can be a plate-like structure, and the thickness direction of the reinforcing part 12 can be aligned with the first direction X and / or the second direction Y. At least a portion of the projection of the reinforcing part 12 along the first direction X is located within the projection area of ​​the battery cell assembly 2 to enhance local load-bearing capacity. For example, the main load-bearing plate 11 is connected to both opposite ends along the second direction Y by the reinforcing part 12. The main load-bearing plate 11 is also connected to both opposite ends along the third direction Z by the reinforcing part 12.

[0129] The connection between the main load-bearing plate 11 and the reinforcing part 12 can be welding, bonding, mechanical connection, or other methods, depending on the material properties and process requirements. For example, the reinforcing part 12 can also be integrally formed with the main load-bearing plate 11 to improve the overall structural integrity.

[0130] It should be noted that when the battery device 100 is in operation, the first direction X can be the up and down direction, which includes the direction of gravity and the tilt direction that forms an acute angle with the direction of gravity.

[0131] For example, the first direction X is the up and down direction. The base plate 1 is located below the battery cell assembly 2. The upper surface of the main support plate 11 and the reinforcing part 12 of the base plate 1 is in contact with the lower surface of the battery cell assembly 2. The contact can be direct contact or indirect contact with an intermediary object (such as the insulating layer 9 mentioned later).

[0132] In the embodiments of this application, by providing a main support plate portion 11 and a reinforcing portion 12 in the base plate 1, and ensuring that at least a portion of the projection of the reinforcing portion 12 is located within the projection range of the battery cell assembly 2, the load-bearing capacity of the base plate 1 on the battery cell assembly 2 is improved, and the probability of deformation of the base plate 1 is reduced. Furthermore, the dimension of the reinforcing portion 12 in the first direction X is larger than that of the main support plate portion 11, which enhances the local structural rigidity and improves the structural stability of the base plate 1. Therefore, the battery box 10 in the embodiments of this application has relatively high structural stability. Moreover, since the local part of the base plate 1 (the main support plate portion 11) is relatively thin, it is also beneficial to reduce the weight of the battery box 10, thereby facilitating the lightweighting of the battery device 100.

[0133] In some embodiments, such as Figure 5 , Figure 7 and Figure 8 As shown, the base plate 1 also includes a connecting part 13. The connecting part 13 is connected to one end of the reinforcing part 12 away from the main bearing plate part 11 along the second direction Y. The connecting part 13 is projected into the same plane along the first direction X. The projection of the connecting part 13 is outside the projection range of the battery cell assembly 2. In the first direction X, the size of the connecting part 13 is larger than the size of the main bearing plate part 11. The connecting part 13 is used to connect electrical equipment.

[0134] It is understandable that, in the first direction X, the size of the connecting part 13 is larger than the size of the main bearing plate part 11, meaning that, in the first direction X, the minimum size of the connecting part 13 is greater than the maximum size of the main bearing plate part 11.

[0135] By providing a connecting portion 13 and connecting it to the reinforcing portion 12, the base plate 1 not only has a load-bearing function but also serves as a connector between the battery device 100 and external electrical equipment. Furthermore, since the connecting portion 13 is connected to the end of the reinforcing portion 12 located away from the main load-bearing plate portion 11 along the second direction Y, the reinforcing portion 12 is positioned in the force transmission path when the battery device 100 is connected to the electrical equipment, and the reinforcing portion 12 has a strengthening effect, thus enhancing the structural stability of the battery device 100. Additionally, the projection of the connecting portion 13 along the first direction X is outside the projection range of the battery cell assembly 2, reducing the impact of the connecting portion 13 on the arrangement of the battery cell assembly 2. Moreover, in the first direction X, the minimum dimension of the connecting portion 13 is greater than the maximum dimension of the main load-bearing plate portion 11, thus the connecting portion 13 has higher strength and rigidity, improving the assembly reliability and structural stability of the battery device 100.

[0136] Of course, it is understood that the connection portion 13 for connecting to electrical equipment is not limited to being provided on the base plate 1. For example, the connection portion 13 may be provided on other walls of the battery box 10 besides the base plate 1. Furthermore, when the connection portion 13 is provided on the base plate 1, the positional relationship between the connection portion 13 and the reinforcing portion 12 is not limited as described above. For example, the reinforcing portion 12 may not be connected to the connection portion 13, and the connection portion 13 may be connected to at least one end of the main support plate portion 11 along the third direction Z. Additionally, the size of the connection portion 13 is not limited as described above; for example, in the first direction X, the minimum size of the connection portion 13 is less than or equal to the maximum size of the main support plate portion 11.

[0137] In some embodiments, such as Figure 5 , Figure 7 and Figure 8 As shown, the connecting part 13 includes a first part 131 and a second part 132. One end of the first part 131 is connected to the reinforcing part 12 along the second direction Y, and the other end is connected to the second part 132. In the first direction X, the size of the second part 132 is greater than or equal to the size of the first part 131. The battery box 10 also includes a mounting member 3, which is connected to the second part 132. The mounting member 3 is used to connect electrical equipment.

[0138] It is understandable that, in the first direction X, the size of the second part 132 is greater than or equal to the size of the first part 131, which means that, in the first direction X, the minimum size of the second part 132 is greater than or equal to the maximum size of the first part 131.

[0139] Mounting component 3 is a part connected to the second part 132 and used for connection with electrical equipment, for mounting the battery device 100 on the electrical equipment. For example, Figure 7As shown, the mounting component 3 includes a main body 31 and a boss 32 protruding from one side of the main body 31 along a first direction X. The boss 32 is embedded in the second part 132. The outer surface of the main body 31 abuts against the outer surface of the second part 132. A connecting hole 30 passes through the boss 32 and the main body 31 along the first direction X. The connecting hole 30 is used for connecting to electrical equipment. For example, as shown... Figure 5 As shown, the main body 31 of the mount 3 includes a base 311 and ears 312 connected to the base 311 and the opposite sides in the third direction Z. Both the base 311 and the ears 312 abut against the surface of the second part 132, and both ears 312 are fixedly connected to the second part 132 by fasteners. The connecting hole 30 penetrates the base 311 and the boss 32. In the first direction X, the size of the base 311 is larger than the size of the ears 312.

[0140] For example, mount 3 is made of metal.

[0141] In the embodiments of this application, by making the connecting portion 13 include a first portion 131 and a second portion 132, and making the dimension of the second portion 132 along the first direction X greater than or equal to that of the first portion 131, the structural strength and connection reliability of the connecting portion 13 are further enhanced. Furthermore, the mounting member 3 is disposed on the second portion 132, enabling a more stable connection with external electrical equipment, thereby improving the structural stability and installation stability of the battery device 100.

[0142] Of course, it is understood that the connecting portion 13 is not limited to including the first portion 131 and the second portion 132. In other embodiments, the connecting portion 13 can be a structure with uniform size in the first direction X, or include three, four or more portions with different sizes along the first direction X.

[0143] In some embodiments, such as Figure 8 As shown, in the first direction X, the ratio of the size L2 of the second part 132 to the size L1 of the first part 131 is greater than or equal to 1.5 and less than or equal to 5.

[0144] For example, the side of the base plate 1 where the battery cell assembly 2 is located is the first side, and the side facing away from the battery cell assembly 2 is the second side. The surfaces of the first part 131 and the second part 132 facing the first side are coplanar, and a portion of the second part 132 extends beyond the first part 131 toward the second side.

[0145] For example, in the first direction X, the ratio of the size L2 of the second part 132 to the size L1 of the first part 131 can be, but is not limited to, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, and 5.

[0146] Thus, by limiting the ratio of the dimensions of the second part 132 to the first part 131 to be greater than or equal to 1.5 and less than or equal to 5, the connecting part 13 can meet structural strength requirements without excessively increasing material usage, thereby achieving a better balance between lightweighting and structural strength. In addition, the dimensional changes between the two are not too large, reducing the risk of stress concentration at various points on the connecting steps.

[0147] Of course, it is understood that the ratio of the size of the second part 132 to the size of the first part 131 in the first direction X is not limited to the above range. In other embodiments, the ratio of the size of the second part 132 to the size of the first part 131 in the first direction X may be less than 1.5 or greater than 5.

[0148] In some embodiments, such as Figure 7 As shown, the reinforcing part 12 includes a first plate part 121 and a second plate part 122. One end of the first plate part 121 along the second direction Y is connected to the main bearing plate part 11, and the other end is connected to the second plate part 122. The thickness direction of the first plate part 121 is consistent with the first direction X, and the thickness direction of the second plate part 122 is consistent with the second direction Y.

[0149] The thickness direction of the first plate portion 121 is consistent with the first direction X, and the thickness direction of the second plate portion 122 is consistent with the second direction Y. That is, the plate formed by the first plate portion 121 and the second plate portion 122 is a bent plate. In this way, the load-bearing capacity of the battery cell assembly 2 along the first direction X can be improved, and the use of materials can be reduced, thereby facilitating weight reduction.

[0150] In some embodiments, such as Figure 7 As shown, the ratio of the thickness T1 of the first plate portion 121 to the thickness T3 of the main bearing plate portion 11 is greater than or equal to 1.5 and less than or equal to 5.

[0151] It is understood that the thickness direction of the first plate portion 121 is consistent with the first direction X, and the thickness T1 of the first plate portion 121 is its dimension along the first direction X; the thickness direction of the main bearing plate portion 11 is consistent with the first direction X, and the thickness T3 of the main bearing plate portion 11 is its dimension along the first direction X.

[0152] For example, the surface of the first plate portion 121 facing the battery cell assembly 2 is coplanar with the surface of the main support plate portion 11 facing the battery cell assembly 2, and a portion of the first plate portion 121 extends beyond the main support plate portion 11 from the side opposite to the battery cell assembly 2.

[0153] For example, the end face of the second plate portion 122 facing the battery cell assembly 2 is coplanar with the surface of the first plate portion 121 facing the battery cell assembly 2, and a portion of the second plate portion 122 extends beyond the first plate portion 121 from the side opposite to the battery cell assembly 2.

[0154] For example, the ratio of the thickness T1 of the first plate portion 121 to the thickness T3 of the main bearing plate portion 11 can be, but is not limited to, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, and 5.

[0155] Thus, by limiting the ratio of the thickness T1 of the first plate portion 121 to the thickness T3 of the main load-bearing plate portion 11 to be greater than or equal to 1.5 and less than or equal to 5, the first plate portion 121 can meet structural strength requirements without excessively increasing material usage, thereby achieving a better balance between lightweighting and structural strength. Furthermore, the thickness variation between the two portions is not too large, reducing the risk of stress concentration at the connection steps.

[0156] Of course, it is understood that the ratio of the thickness T1 of the first plate portion 121 to the thickness T3 of the main bearing plate portion 11 is not limited to the above range. In other embodiments, the ratio of the thickness T1 of the first plate portion 121 to the thickness T3 of the main bearing plate portion 11 may be less than 1.5 or greater than 5.

[0157] In some embodiments, such as Figure 8 As shown, the reinforcing part 12 is configured as a second plate part 122 whose thickness direction is aligned with the second direction Y.

[0158] The thickness direction of the main bearing plate 11 is consistent with the first direction X, and the thickness direction of the second plate 122 is consistent with the second direction Y. That is, the plate formed by the main bearing plate 11 and the second plate 122 is a bent plate. In this way, the load-bearing capacity of the battery cell assembly 2 along the first direction X can be improved, and the use of materials can be reduced, which is beneficial to weight reduction.

[0159] In some embodiments, such as Figure 7 and Figure 8 As shown, the ratio of the thickness T2 of the second plate portion 122 to the thickness T3 of the main bearing plate portion 11 is greater than or equal to 1.5 and less than or equal to 5.

[0160] It is understandable that the thickness T2 of the second plate portion 122 is the dimension of the second plate portion 122 along the second direction Y, and the thickness T3 of the main bearing plate portion 11 is the dimension of the main bearing plate portion 11 along the first direction X.

[0161] For example, the end face of the second plate portion 122 facing the battery cell assembly 2 is coplanar with the surface of the main support plate portion 11 facing the battery cell assembly 2, and a portion of the second plate portion 122 extends beyond the main support plate portion 11 from the side opposite to the battery cell assembly 2.

[0162] For example, the ratio of the thickness T2 of the second plate portion 122 to the thickness T3 of the main bearing plate portion 11 can be, but is not limited to, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, and 5.

[0163] Thus, by limiting the ratio of the thickness T2 of the second plate portion 122 to the thickness T3 of the main load-bearing plate portion 11 to be greater than or equal to 1.5 and less than or equal to 5, the second plate portion 122 can meet structural strength requirements without excessively increasing material usage, thereby achieving a better balance between lightweighting and structural strength. Furthermore, the thickness variation between the two portions is not too large, reducing the risk of stress concentration at the connection step.

[0164] Of course, it is understood that the ratio of the thickness T2 of the second plate portion 122 to the thickness T3 of the main bearing plate portion 11 is not limited to the above range. In other embodiments, the ratio of the thickness T2 of the second plate portion 122 to the thickness T3 of the main bearing plate portion 11 may be less than 1.5 or greater than 5.

[0165] In some embodiments, such as Figure 7As shown, the reinforcing part 12 includes a first plate part 121 and a second plate part 122. One end of the first plate part 121 along the second direction Y is connected to the main bearing plate part 11, and the other end is connected to the second plate part 122. The thickness direction of the first plate part 121 is consistent with the first direction X, and the thickness direction of the second plate part 122 is consistent with the second direction Y. The thickness T1 of the first plate part 121 and the thickness T2 of the second plate part 122 are the same.

[0166] In some embodiments, such as Figure 7 and Figure 8 As shown, the base plate 1 also includes a plate-shaped connecting part 13. The connecting part 13 is connected to one end of the second plate body 122 away from the main bearing plate body 11. The connecting part 13 is used to connect electrical equipment. The thickness direction of the connecting part 13 is consistent with the first direction X. The thickness of the connecting part 13 is greater than or equal to the thickness of the second plate body 122.

[0167] For example, the connecting part 13 includes a first part 131 and a second part 132. One end of the first part 131 along the second direction Y is connected to one end of the second plate part 122 away from the main bearing plate part 11, and the other end is connected to the second part 132. Both the first part 131 and the second part 132 are plate-shaped structures, and their thickness directions are consistent with the first direction X. The thickness L1 of the first part 131 is less than the thickness L2 of the second part 132, and the thickness L1 of the first part 131 is greater than or equal to the thickness T2 of the second plate part 122.

[0168] Thus, by setting the connecting part 13 and making its thickness direction consistent with the first direction X, and the thickness of the connecting part 13 being greater than or equal to the thickness of the second plate part 122, the load-bearing capacity of the connecting part 13 can be improved, making it less prone to deformation or breakage when subjected to large loads, thereby improving the structural reliability of the entire battery device 100.

[0169] Of course, it is understood that the thickness of the connecting portion 13 is not limited to being greater than or equal to the thickness of the second plate portion 122. In other embodiments, the thickness of the connecting portion 13 may be less than the thickness of the second plate portion 122.

[0170] In some embodiments, such as Figure 7 and Figure 8 As shown, at least one of the main bearing plate portion 11, the reinforcing portion 12, and the connecting portion 13 has a portion with a thickness greater than or equal to 6 mm, and the portion with a thickness greater than or equal to 6 mm is configured as a hollow structure with a cavity filled with foam; and / or, the thickness of the main bearing plate portion 11, the reinforcing portion 12, and the connecting portion 13 is all less than 6 mm, and the main bearing plate portion 11, the reinforcing portion 12, and the connecting portion 13 are configured as solid structures.

[0171] For example, due to limitations in foam molding and processing technology, the foam thickness is set to 3mm or more in order to ensure stable production.

[0172] Thus, by using a hollow structure filled with foam in areas with a thickness of 6 mm or more, weight can be further reduced while maintaining good mechanical properties, provided that structural strength is met. Solid structures are used in areas with a thickness less than 6 mm to ensure structural strength requirements are met.

[0173] Of course, it is understood that the structure of the main bearing plate 11, the reinforcing part 12 and the connecting part 13 is not limited. In other embodiments, when the thickness of the main bearing plate 11, the reinforcing part 12 and the connecting part 13 is greater than or equal to 6 mm, they are all solid structures; or when the thickness is less than 6 mm, they can be hollow structures and filled with foam.

[0174] In some embodiments, such as Figure 7 As shown, when projected along the first direction X into the same plane, the overlapping portion of the projection of the reinforcing part 12 and the projection of the battery cell assembly 2 in the second direction Y has a dimension L3 greater than or equal to 5 mm and less than or equal to 20 mm.

[0175] For example, the overlapping portion of the projection of the reinforcing part 12 and the projection of the battery cell assembly 2 in the second direction Y can be, but is not limited to, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, or 20mm.

[0176] Thus, by limiting the range of the value of the superposition dimension L3 between the reinforcing part 12 and the battery cell assembly 2 in the second direction Y, the reinforcing part 12 can effectively support the battery cell assembly 2 while minimizing the use of materials.

[0177] Of course, it is understood that the overlapping dimension L3 of the projection of the reinforcing part 12 and the battery cell assembly 2 in the second direction Y is not limited to the above range. In other embodiments, when projected into the same plane along the first direction X, the overlapping part of the projection of the reinforcing part 12 and the projection of the battery cell assembly 2 in the second direction Y can be less than 5mm or greater than 20mm.

[0178] In some embodiments, such as Figure 7 and Figure 8 As shown, the thickness T3 of the main bearing plate 11 is greater than or equal to 1 mm and less than or equal to 2.5 mm.

[0179] For example, the thickness T3 of the main bearing plate portion 11 can be, but is not limited to, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, or 2.5mm.

[0180] In this way, by setting the thickness range of the main bearing plate 11, it can meet the basic bearing requirements without adding unnecessary weight due to excessive thickness, which is beneficial to the lightweighting of the battery device 100.

[0181] Of course, it is understood that the thickness T3 of the main bearing plate portion 11 is not limited to the above range. In other embodiments, the thickness T3 of the main bearing plate portion 11 may be less than 1 mm or greater than 2.5 mm.

[0182] In some embodiments, such as Figure 7 and Figure 8 As shown, the main load-bearing plate 11, the reinforcing part 12, and the connecting part 13 are formed into an integral structure.

[0183] In this way, by forming the main load-bearing plate 11, the reinforcing part 12 and the connecting part 13 into an integral molded structure, the number of parts and assembly steps can be effectively reduced, and production efficiency and structural reliability can be improved.

[0184] Of course, it is understood that the main bearing plate 11, the reinforcing part 12 and the connecting part 13 are not limited to being integrally formed. In other embodiments, the main bearing plate 11, the reinforcing part 12 and the connecting part 13 can be formed separately and connected by bonding, welding or fasteners.

[0185] In some embodiments, at least a portion of the base plate 1 is made of a continuous fiber composite material.

[0186] Continuous fiber composite materials possess high strength and stiffness, meeting the strength and stiffness requirements of the base plate 1. Furthermore, their lightweight properties contribute to weight reduction in the battery device 100. Moreover, continuous fiber composite materials do not suffer from rusting issues, and their manufacturing process is relatively environmentally friendly, helping to reduce carbon emissions. Therefore, using continuous fiber composite materials to fabricate at least a portion of the base plate 1 (e.g., the main load-bearing plate 11, the reinforcing portion 12, and the connecting portion 13) offers advantages such as light weight, high strength, and corrosion resistance, making it particularly suitable for applications like the aircraft 1000 where structural weight and strength requirements are high.

[0187] Of course, the material of the base plate 1 is not limited to continuous fiber composite material; in other embodiments, the base plate 1 is made of metal.

[0188] In some embodiments, the base plate 1 includes multiple layers of continuous fiber composite material, each layer of which includes continuous fibers and a thermosetting resin matrix, wherein the thermosetting resin matrix connects the continuous fibers.

[0189] For example, the thermosetting resin matrix may be, but is not limited to, thermosetting epoxy resin, thermosetting phenolic resin, thermosetting unsaturated polyester resin, thermosetting cyanate ester resin, etc.

[0190] For example, continuous fibers include one or more combinations of organic fibers and inorganic fibers. Organic fibers include any one or more combinations of aromatic polyamide fibers and ultra-high molecular weight polyethylene fibers. Inorganic fibers include any one or more combinations of glass fibers, aramid fibers, or boron fibers.

[0191] The continuous fiber composite material layer formed by continuous fibers and a thermosetting resin matrix possesses high strength, high rigidity, and high toughness, which helps to improve the structural strength and rigidity of the base plate 1. Thus, by stacking multiple layers of continuous fiber composite material, the mechanical properties and thermal stability of the plate can be further improved, meeting the requirements for use in complex environments.

[0192] For example, a continuous fiber composite board is formed by multiple layers of continuous fiber composite material, and the continuous fiber composite board is molded to form a base plate 1.

[0193] In the above technical solution, the multi-layered continuous fiber composite material layers are first laminated to form a continuous fiber composite board, which is then molded to form the base plate 1. Using a molding process can more accurately improve the shape and dimensional precision of the base plate 1, thereby maximizing its mechanical properties and structural integrity. Furthermore, molding the continuous fiber composite board also improves production efficiency.

[0194] In some embodiments, such as Figure 9 and Figure 10 As shown, the continuous fiber is carbon fiber, and the base plate 1 has an insulating layer 9 connected to at least the surface of the battery cell assembly 2.

[0195] For example, the insulating layer 9 can be formed by brushing on insulating varnish or by molding with fiberglass prepreg.

[0196] For example, the continuous fiber is carbon fiber, and the thermosetting resin matrix is ​​epoxy resin matrix.

[0197] This configuration, by setting an insulating layer 9 at a specific location on the base plate 1, can effectively reduce the risk of electrical conductivity between the battery cell assembly 2 and the carbon fiber, making it particularly suitable for high-voltage or high-current operating environments.

[0198] Of course, it is understood that the continuous fiber is not limited to carbon fiber. In other embodiments, the continuous fiber is glass fiber, and the thermosetting resin matrix is ​​polyurethane or other thermosetting resin systems such as unsaturated resin. Because glass fiber has good insulation properties, in this case, the insulation layer 9 may not be required.

[0199] In some embodiments, such as Figure 5 , Figure 7 and Figure 9 As shown, the battery box 10 also includes end plates 4. The main support plate 11 is connected to both ends of the third direction Z. The receiving cavity is formed between the two end plates 4. The main support plate 11 is provided with second plate portions 122 at both ends of the second direction Y. The second plate portions 122 extend relative to the main support plate 11 in the first direction X toward the side away from the receiving cavity and are connected between the two end plates 4. The battery box 10 also includes a bottom guard plate 5. The bottom guard plate 5 is provided on the side of the bottom plate 1 away from the receiving cavity. The portion of the bottom plate 1 between the two second plate portions 122, the two second plate portions 122, the two end plates 4 and the bottom guard plate 5 form a venting cavity 50. The main support plate 11 is formed with an exhaust hole that runs through the first direction X. The exhaust hole is closed by a sealing member 6. When the pressure or temperature on the sealing member 6 reaches a predetermined threshold, the exhaust hole opens.

[0200] For example, the edge of the bottom guard plate 5 is connected to the edge of the bottom plate 1, and the connection method includes, but is not limited to, adhesive bonding or fastener connection.

[0201] Understandably, a portion of the end plate 4 extends beyond the main support plate 11 along the first direction X toward the bottom guard plate 5, and this extended portion forms a venting cavity 50. Another portion of the end plate 4 extends beyond the main support plate 11 along the first direction X toward the side opposite to the bottom guard plate 5, and this other extended portion forms a receiving cavity.

[0202] The thickness direction of the second plate portion 122 is consistent with the second direction Y. The second plate portion 122 extends relative to the main support plate portion 11 in the first direction X toward the side away from the receiving cavity. In this way, the two second plate portions 122, together with the bottom protective plate 5, the portion of the bottom plate 1 between the two second plate portions 122, and the two end plates 4 on the side of the main support plate portion 11 away from the receiving cavity, form a relatively large venting cavity 50. This allows the vented material released by the battery cell assembly 2 after thermal runaway to enter the venting cavity 50, reducing the impact on the wiring harness and pipelines in the receiving cavity.

[0203] In addition, the reinforcement 12 makes the part of the base plate 1 that abuts against the battery cell assembly 2 (at least part of the main support plate 11 and the reinforcement 12) less prone to deformation, thereby improving the structural stability of the venting chamber 50 and improving the reliability of venting.

[0204] In some embodiments, such as Figure 10 As shown, the battery cell 20 includes a housing 201, a second pressure relief mechanism 202 disposed on the housing 201, and an electrode assembly 203 housed in the housing 201. The battery cell 20 is disposed in the housing cavity with the second pressure relief mechanism 202 facing the main support plate 11, and the second pressure relief mechanism 202 and the vent are disposed opposite to each other along the first direction X.

[0205] The outer casing 201 can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film. In some embodiments, the outer casing 201 can be a sealed structure or a non-sealed structure. As an example, when the outer casing 201 is a non-sealed structure, it serves to protect the electrode assembly 203. A sealing bag is also included between the outer casing 201 and the electrode assembly 203 to encapsulate the electrode assembly 203 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the outer casing 201 is a sealed structure, it is used to encapsulate the electrode assembly 203 and electrolyte components.

[0206] For example, the housing 201 includes an end cap 2011 and a housing 2012, the housing 2012 having an opening, and the end cap 2011 covering the opening. The housing 2012 may have one or more openings. The end cap 2011 may also be provided with one or more. For example, a second pressure relief mechanism 202 is provided on the end cap 2011 and / or the housing 2012.

[0207] The second pressure relief mechanism 202 is used to release internal gas from the battery cell 20. As an example, it is actuated to release internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 20 reaches the predetermined threshold, the second pressure relief mechanism 202 actuates or a weak structure within the second pressure relief mechanism 202 is damaged, thereby forming an opening or channel for internal pressure or temperature release. This threshold design varies depending on design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 20.

[0208] As an example, the second pressure relief mechanism 202 can be integrally formed with the housing 201.

[0209] As an example, the second pressure relief mechanism 202 can also be separately configured and connected to the housing 201.

[0210] The term "actuation" as used in this application refers to the second pressure relief mechanism 202 being activated or reaching a certain state, thereby releasing the internal pressure and temperature of the battery cell 20. The actions of the second pressure relief mechanism 202 may include, but are not limited to: movement of components within the second pressure relief mechanism 202 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the second pressure relief mechanism 202, etc. When the second pressure relief mechanism 202 is actuated, the high-temperature, high-pressure substances inside the battery cell 20 are discharged outwards from the actuated portion as exhaust materials. This method enables pressure and temperature relief of the battery cell 20 under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0211] With this configuration, during the thermal runaway of the battery cell 20, the emissions released by the battery cell 20 directly enter the venting chamber 50 through the vent hole, thereby improving the thermal runaway protection efficiency.

[0212] Of course, it is understood that the arrangement of the battery cell 20 within the receiving cavity is not limited to the second pressure relief mechanism 202 facing the main support plate 11. In some other embodiments, the second pressure relief mechanism 202 of the battery cell 20 may face the top plate of the cover 102 opposite to the bottom plate 1 along the first direction X, or any side plate of the battery box 10 connected between the bottom plate 1 and the top plate.

[0213] In some embodiments, such as Figure 5 and Figure 9 As shown, at least one end plate 4 has an exhaust channel that communicates with the venting chamber 50, and a pressure relief mounting port 433 is formed on the wall of the end plate 4 away from the receiving chamber. The battery box 10 also includes a first pressure relief mechanism 7, which is installed in the pressure relief mounting port 433.

[0214] For example, one of the two end plates 4 has an exhaust channel, while the other does not.

[0215] In this way, the venting material emitted by the battery cell 20 can enter the venting chamber 50 through the vent hole and then accumulate in the venting channel. When the pressure or temperature of the venting channel reaches a predetermined threshold, at least a part of the first pressure relief mechanism 7 will rupture, break, tear or open, so that the venting material can be discharged through the first pressure relief mechanism 7, thereby reducing the internal pressure and temperature and reducing the risk of the battery device 100 exploding.

[0216] In some embodiments, such as Figure 9As shown, part of the vent chamber 50 is located between the two end plates 4, and another part is located on the side of the end plate 4 facing the bottom guard plate 5 along the first direction X. At least one end plate 4 has a first cavity 41, a second cavity 42, and a third cavity 43. The first cavity 41 is located on the side of the second cavity 42 that is close to the vent chamber 50 along the third direction Z. The first cavity 41 has a first through hole 411 that communicates with the vent chamber 50 on the cavity wall away from the second cavity 42 along the third direction Z. A first wall 421 separates the first cavity 41 and the second cavity 42. The first wall 421 has a second through hole 422. The third cavity 43 is located... The second cavity 42 is located on the side away from the venting cavity 50 along the first direction X. A third through hole 423 is formed in the cavity wall of the second cavity 42 away from the third cavity 43 along the first direction X. A second wall 431 separates the second cavity 42 and the third cavity 43. A fourth through hole 432 is formed in the second wall 431. A pressure relief installation port 433 is formed in the cavity wall of the third cavity 43 away from the receiving cavity along the third direction Z. The first through hole 411, the first cavity 41, the second through hole 422, the second cavity 42, the third through hole 423, the fourth through hole 432, the third cavity 43, and the pressure relief installation port 433 constitute an exhaust flow channel.

[0217] Thus, by setting multiple cavities and through holes inside the end plate 4 to form an exhaust channel, the thermal runaway gas can be discharged in stages, the pressure can be released gradually, the probability of instantaneous high pressure impact can be reduced, thereby improving the stability of the battery device 100.

[0218] For example, end plate 4 is an expansion beam, and expansion beams are provided on both sides of the battery cell assembly 2 along the third direction Z. The expansion beams are used to bear the expansion force of the battery cell assembly 2. The cavity of the expansion beam (including the first cavity 41 and / or the second cavity 42 and / or the third cavity 43) is first molded and cured, wherein the middle cavity is filled with a mold core. After the expansion beam is completely cured, the mold core is removed to form a hard cavity-type expansion beam structure after curing. Then the openings at both ends of the expansion beam are filled with foam or other baffles.

[0219] When the battery cell module 2 expands due to charging and discharging, the expansion beam can provide anti-expansion force, reduce the probability of expansion of the battery cell module 2 or reduce the degree of expansion of the battery cell module 2.

[0220] In some embodiments, such as Figure 9 As shown, when projected onto the same projection plane along the third direction Z, the projection of the first through hole 411 and the projection of the second through hole 422 have an overlapping portion. When projected onto the same projection plane along the first direction X, the projection of the third through hole 423 and the projection of the fourth through hole 432 have an overlapping portion.

[0221] For example, the first through hole 411 and the second through hole 422 have the same cross-section and are positioned opposite each other along the third direction Z. The projection of the third through hole 423 is the same as the cross-section of the fourth through hole 432 and is positioned opposite each other along the first direction X.

[0222] For example, the first cavity 41, the second cavity 42, and the third cavity 43 all extend along the second direction Y. Multiple first through holes 411 are spaced apart along the second direction Y, and multiple second through holes 422 are spaced apart along the second direction Y. Each of the multiple first through holes 411 corresponds to one of the multiple second through holes 422. The multiple first through holes 411 connect to the same first cavity 41, and the multiple second through holes 422 connect to both the same first cavity 41 and the same second cavity 42. Multiple third through holes 423 are spaced apart along the second direction Y, and multiple fourth through holes 432 are spaced apart along the second direction Y. Each of the multiple third through holes 423 corresponds to one of the multiple fourth through holes 432. The multiple third through holes 423 connect to the same second cavity 42, and the multiple fourth through holes 432 connect to both the same second cavity 42 and the same third cavity 43.

[0223] In this way, by setting the projection overlap relationship of the through holes in different directions, the gas flow path can be optimized, the flow resistance can be reduced, and the exhaust efficiency can be improved, thereby quickly releasing pressure in the event of thermal runaway and improving the operational reliability of the battery device 100.

[0224] Of course, it is understandable that the relative positions of the first through hole 411 and the second through hole 422 are not limited, and the projections of the first through hole 411 and the second through hole 422 along the third direction Z may not overlap, that is, the first through hole 411 and the second through hole 422 are staggered. The relative positions of the third through hole 423 and the fourth through hole 432 are not limited, and the projections of the third through hole 423 and the fourth through hole 432 along the first direction X may not overlap, that is, the third through hole 423 and the fourth through hole 432 are staggered.

[0225] In some embodiments, such as Figure 4 , Figure 5 and Figure 9 As shown, the battery box 10 also includes a flow guide shroud 8, which includes a shroud body 81 and a flow guide tube 82 connected together. The shroud body 81 is connected to the end plate 4 which has a pressure relief installation port 433 and is placed on the outside of the first pressure relief mechanism 7. The shroud body 81 and the end plate 4 form a flow collection cavity 80. One end of the flow guide tube 82 is connected to the flow collection cavity 80, and the other end forms an exhaust port.

[0226] For example, at least a portion of the flow guide body 82 extends along a first direction X.

[0227] For example, when the battery device 100 is in operation, the first direction X is the up-down direction, the guide tube body 82 is connected to the lower end of the cover part 81, and the lower end of the guide tube body 82 forms an exhaust port.

[0228] Thus, by setting the flow guide shroud 8 and its flow guide tube 82, the thermal runaway gas can be effectively guided to be discharged in a designated direction, reducing the probability of the gas spreading to other sensitive areas, thereby reducing the risk of damage to surrounding components and improving the operational reliability of the battery device 100.

[0229] In some embodiments, such as Figure 4 and Figure 5 As shown, multiple first pressure relief mechanisms 7 are installed on the same end plate 4, and the cover part 81 covers the outside of at least two first pressure relief mechanisms 7.

[0230] Thus, by installing multiple first pressure relief mechanisms 7 on an end plate 4 and uniformly covering them with a flow guide shroud 8, the exhaust capacity and efficiency can be improved, while simplifying the structural design and facilitating maintenance and replacement.

[0231] In some embodiments, such as Figure 9 As shown, the battery box 10 also includes an exhaust seal (not shown in the figure), which seals between the cover portion 81 and the end plate 4.

[0232] For example, the exhaust seal can be, but is not limited to, high-temperature resistant silicone rubber or sealant.

[0233] Thus, by providing an exhaust seal between the cover portion 81 and the end plate 4, the sealing performance of the exhaust channel can be improved, the probability of gas leakage can be reduced, thereby improving the efficiency of venting, and the probability of gas leakage during the emission process can be reduced, thereby reducing the impact of leaked high-temperature gas on the wiring harness and pipelines around the outside of the battery device 100.

[0234] In the embodiments of this application, "multiple" means two or more.

[0235] In some embodiments, the cover portion 81 and / or the guide tube portion 82 are made of titanium alloy.

[0236] Thus, by using titanium alloy to make the cover part 81 and / or the guide tube body 82, its high temperature resistance and corrosion resistance can be significantly improved, its service life can be extended, and it also has good mechanical strength.

[0237] In some embodiments, the cover portion 81 is connected to the end plate 4 by fasteners.

[0238] For example, fasteners can be, but are not limited to, blind rivets, bolts, and rivet nuts.

[0239] Thus, since the instantaneous air pressure is large during thermal runaway, the connection between the cover 81 and the end plate 4 can be strengthened by using fasteners to connect them, thereby reducing the risk of the deflector 8 falling off and facilitating disassembly and maintenance.

[0240] In some embodiments, such as Figure 9 As shown, the cover part 81 includes a first cover wall opposite to the first pressure relief mechanism 7 along the third direction Z, and the distance L4 between the first cover wall and the first pressure relief mechanism 7 along the third direction Z is greater than or equal to 15mm.

[0241] For example, the distance L4 between the first cover wall of the cover portion 81, which is opposite to the first pressure relief mechanism 7 along the third direction Z, and the first pressure relief mechanism 7 along the third direction Z can be, but is not limited to, 15mm, 16mm, 17mm, 18mm, 19mm, or 20mm.

[0242] Thus, by setting the range of the distance L4 between the first cover wall and the first pressure relief mechanism 7, a sufficiently large space is provided for the first pressure relief mechanism 7 to eject, so as to meet the exhaust volume requirements of the first pressure relief mechanism 7, allowing the gas to be discharged smoothly and improving the efficiency of gas release.

[0243] In some embodiments, such as Figure 3 and Figure 4 As shown, the battery device 100 includes a plurality of battery boxes 10, at least some of which are arranged along the second direction Y, and adjacent battery boxes 10 are interconnected. Each battery box 10 contains a battery cell assembly 2. This increases the electrical capacity of the battery device 100.

[0244] For example, such as Figure 4 As shown, the covers 102 of adjacent battery boxes 10 are connected to each other, and the bottom plates 1 of the boxes 101 of adjacent battery boxes 10 are connected to each other. For example, the bottom protective plates 5 of adjacent battery boxes 10 are connected to each other.

[0245] A second aspect of this application provides an electrical device that includes a plurality of battery devices 100 provided in the first aspect, the battery devices 100 being used to store or provide electrical energy.

[0246] Because the electrical device includes the battery device 100 and has all the beneficial effects of the battery device 100, the electrical device has high structural stability and is relatively lightweight.

[0247] In some embodiments, the electrical device is the aircraft 1000.

[0248] Aircraft 1000 generally refers to a device that flies within or outside the atmosphere (space), and can include aircraft flying within the atmosphere and spacecraft flying in space. Aircraft can include airplanes, airships, etc., and for example, it can be a low-altitude aircraft 1000, an eVTOL (electric vertical take-off and landing) aircraft 1000, a commuter aircraft, a regional jet, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. For example, aircraft 1000 is a cargo drone.

[0249] In some embodiments, the aircraft 1000 has a battery housing, a battery device 100 is installed in the battery housing, and a guide tube 82 of the battery device 100 extends outward through the wall of the battery housing to discharge the released gas to the outside of the aircraft 1000.

[0250] The following describes specific examples of some embodiments of this application with reference to the accompanying drawings.

[0251] As a specific example, a battery pack (battery assembly 100) is provided. The battery pack includes an electrical box (battery box 10) and multiple battery cells (battery cells 20) housed within the electrical box. The multiple battery cells are bonded together to form a battery cell assembly (battery cell group 2). The battery cell assembly is supported on the upper side of the base plate (base plate 1) of the electrical box along a first direction X. The two ends of the base plate along a second direction Y form mounting beams (second part 132). The battery pack is connected to the fuselage 200 of the aircraft 1000 through the mounting beams. The base plate extends from the portion located below the battery cell assembly to... The thickness of the mounting beam and the base plate 1 increases gradually. The mounting beam should have sufficient rigidity, and its thickness is relatively thick. The thinnest area of ​​the base plate (main load-bearing plate 11) is located below the battery cell assembly. The thinnest area is connected to a relatively thicker area (reinforcing part 12) around its perimeter. This thicker area is located below the battery cell assembly. The thickness of the thinnest area is between 1mm and 2.5mm, which is beneficial for weight reduction. The thickness ratio of two adjacent areas with different thicknesses should be more than 1.5 times. Considering weight reduction and stress concentration, the thickness ratio usually does not exceed 5 times. The base plate is molded from lightweight carbon fiber composite material. Since the outer shell 201 of the battery cell may be charged, the area of ​​the base plate 1 directly below the battery cell assembly and the sides of the electrical box that may have creepage need to be designed with an insulation layer 9 to isolate them from the carbon fiber. A bottom protective plate 5 is installed below the base plate 1. The interior of the electrical box is equipped with an expansion beam (end plate 4) formed by carbon fiber molding or pultrusion. The expansion beam has multiple cavities. When the battery cell experiences thermal runaway, the high-temperature and high-pressure gas first accumulates in the cavity (venting cavity 50) formed between the base plate 1 and the bottom protective plate 5. It then enters the first cavity (first cavity 41) through the opening of the expansion beam, and then enters the second cavity (second cavity 42) and the third cavity (third cavity 43) through the opening. This causes the explosion-proof valve (first pressure relief mechanism 7) to open, and the high-temperature and high-pressure gas enters the fourth cavity (combination cavity 80). It is then discharged in a designated direction through the cavity (inner cavity of the guide pipe body 82) on the exhaust guide bracket (guide shield 8). To allow the gas to enter the first cavity, part of the expansion beam faces the part of the bottom protective plate 5 that extends beyond the part of the base plate 1 that carries the battery cell (main bearing plate body 11). This structure makes full use of the height space between the base plate 1 and the bottom protective plate 5, which not only enhances the rigidity of the expansion beam and meets the anti-expansion effect, but also saves height space. Similarly, for cell insulation, an insulation layer 9 needs to be added between the carbon fiber and the cell for protection. This insulation layer 9 can typically be formed using glass fiber prepreg or insulating varnish. Sufficient space must be reserved between the exhaust guide bracket and the outer end face of the explosion-proof valve to allow for normal exhaust. The distance between the outer end face of the explosion-proof valve and the wall of the exhaust guide bracket along the direction of the explosion-proof valve's discharge should be greater than or equal to 15mm. Foam force transmission should be avoided at the mounting connection points. In the cell assembly, heat-insulating pads are bonded between the individual battery cells 20. By reinforcing the support at the bottom edge of the cell assembly and thinning other areas at the bottom of the cell assembly, weight reduction can be achieved through structural optimization.Based on weight reduction and structural rigidity requirements, the width of the thickened area at the bottom of the cell assembly is greater than or equal to 5mm and less than or equal to 20mm. The thermal runaway exhaust channel is isolated from the cell space (accommodation cavity) and directly exhausts to the outside through the space between the bottom plate 1 and the bottom protective plate 5, the cavity of the expansion beam, the explosion-proof valve, and the exhaust guide bracket. The size of the exhaust holes between each interface should be greater than or equal to the exhaust area of ​​the explosion-proof valve (first pressure relief mechanism 7) to reduce the probability of trapped air. The exhaust guide bracket is made of titanium alloy.

[0252] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, and improvements made within the spirit and scope of this application are included within the scope of protection of this application.

Claims

1. A battery device, characterized by, The battery box includes a receiving cavity, and the battery box includes a bottom plate. The battery cell assembly includes a plurality of battery cells, and the battery cell assembly is received in the receiving cavity, and the bottom plate bears the battery cell assembly from one side in a first direction. The bottom plate includes a main bearing plate body and a reinforcing portion, a thickness direction of the main bearing plate body is consistent with the first direction, at least one end of the main bearing plate body in a second direction is connected with the reinforcing portion, the second direction intersects the first direction, and a projection of the main bearing plate body in the same plane in the first direction is within a projection range of the battery cell assembly, and at least part of a projection of the reinforcing portion is within the projection range of the battery cell assembly, and in the first direction, a size of the reinforcing portion is greater than a size of the main bearing plate body. The bottom plate further includes a connecting portion connected with one end of the reinforcing portion away from the main bearing plate body in the second direction, and a projection of the connecting portion in the same plane in the first direction is outside the projection range of the battery cell assembly, in the first direction, the size of the connecting portion is greater than the size of the main bearing plate body, and the connecting portion is used for connecting an electrical equipment.

2. The battery device according to claim 1, characterized by The connecting portion includes a first portion and a second portion, one end of the first portion is connected with the reinforcing portion in the second direction, and the other end is connected with the second portion, in the first direction, the size of the second portion is greater than or equal to the size of the first portion, 3. The battery device of claim 2, wherein, The battery box further includes a mounting member connected to the second portion, and the mounting member is used for connecting an electrical equipment. In the first direction, a ratio of the size of the second portion to the size of the first portion is greater than or equal to 1.5 and less than or equal to 5.

4. The battery device of claim 3, wherein The reinforcing portion includes a first plate body portion and a second plate body portion, one end of the first plate body portion is connected with the main bearing plate body in the second direction, and the other end is connected with the second plate body portion, a thickness direction of the first plate body portion is consistent with the first direction, and a thickness direction of the second plate body portion is consistent with the second direction.

5. The battery device of claim 1, wherein A ratio of the thickness of the first plate body portion to the thickness of the main bearing plate body is greater than or equal to 1.5 and less than or equal to 5.

6. The battery device of claim 5, wherein, The reinforcing portion is configured as the second plate body portion with the thickness direction consistent with the second direction.

7. The battery device of claim 1, wherein A ratio of the thickness of the second plate body portion to the thickness of the main bearing plate body is greater than or equal to 1.5 and less than or equal to 5.

8. The battery device according to any one of claims 5 to 7, characterized by, The bottom plate further includes a plate-shaped connecting portion connected with one end of the second plate body portion away from the main bearing plate body, the connecting portion is used for connecting an electrical equipment, a thickness direction of the connecting portion is consistent with the first direction, and the thickness of the connecting portion is greater than or equal to the thickness of the second plate body portion.

9. The battery device according to any one of claims 5 to 7, characterized by, At least one of the main bearing plate body, the reinforcing portion, and the connecting portion has a portion with a thickness greater than or equal to 6 mm, the portion with the thickness greater than or equal to 6 mm is configured as a hollow structure with a cavity, and the cavity is filled with foam; and / or 10. The battery device of claim 9, wherein, ​ The thickness of the main load-bearing plate body part, the reinforcing part and the connecting part is less than 6 mm, and the main load-bearing plate body part, the reinforcing part and the connecting part are provided in a solid structure.

11. The battery device according to any one of claims 1 to 7 and 10, characterized by, The projection of the reinforcing part and the projection of the battery monomer assembly coincide in the same plane along the first direction, and the size of the coinciding part in the second direction is greater than or equal to 5 mm and less than or equal to 20 mm.

12. The battery device according to any one of claims 1 to 7 and 10, characterized by, The thickness of the main load-bearing plate body part is greater than or equal to 1 mm and less than or equal to 2.5 mm.

13. The battery device according to any one of claims 2 to 4 and 10, characterized by, The main load-bearing plate body part, the reinforcing part and the connecting part are integrally formed.

14. The battery device according to any one of claims 2 to 4 and 10, characterized by, At least part of the bottom plate is made of a continuous fiber composite material.

15. The battery device of claim 14, wherein, The bottom plate comprises a plurality of layers of continuous fiber composite material, and each layer of the continuous fiber composite material comprises continuous fibers and a thermosetting resin matrix, and the thermosetting resin matrix connects the continuous fibers.

16. The battery device of claim 15, wherein, The continuous fibers are carbon fibers, and the bottom plate is connected with an insulating layer at least on the surface contacting the battery monomer assembly.

17. The battery device according to any one of claims 5 to 7 and 10, characterized by, The battery box further comprises end plates, the main load-bearing plate body part is connected with the end plates at both ends along a third direction, the accommodating cavity is formed between the two end plates, the third direction intersects the first direction and the second direction, the main load-bearing plate body part is provided with the second plate body part at both ends along the second direction, the second plate body part extends relative to the main load-bearing plate body part along the first direction to a side away from the accommodating cavity and is connected between the two end plates, The battery box further comprises a bottom guard plate, the bottom guard plate is arranged on a side of the bottom plate away from the accommodating cavity, and a part of the bottom plate between the two second plate body parts, the two second plate body parts, the two end plates and the bottom guard plate form a deflation cavity therebetween, The main load-bearing plate body part is formed with an exhaust hole penetrating along the first direction, the exhaust hole is closed by a blocking piece, and the exhaust hole is opened when the pressure or temperature acting on the blocking piece reaches a predetermined threshold.

18. The battery device of claim 17, wherein, At least one of the end plates is formed with an exhaust flow channel, the exhaust flow channel communicates with the deflation cavity and forms a pressure relief mounting port on a wall of the end plate away from the accommodating cavity, The battery box further comprises a first pressure relief mechanism, and the first pressure relief mechanism is mounted in the pressure relief mounting port.

19. The battery device of claim 18, wherein, Part of the deflation cavity is located between the two end plates, and another part is located on a side of the end plate facing the bottom guard plate along the first direction, The at least one end plate has a first cavity, a second cavity and a third cavity. The first cavity is located on a side of the second cavity close to the air release cavity along the third direction. A first through hole communicating with the air release cavity is formed on a cavity wall of the first cavity away from the second cavity along the third direction. A first wall is arranged between the first cavity and the second cavity, and the first wall is formed with a second through hole. The third cavity is located on a side of the second cavity away from the air release cavity along the first direction. A third through hole communicating with the air release cavity is formed on a cavity wall of the second cavity away from the third cavity along the first direction. A second wall is arranged between the second cavity and the third cavity, and the second wall is formed with a fourth through hole. A cavity wall of the third cavity away from the containing cavity along the third direction is formed with the pressure release installation port. The first through hole, the first cavity, the second through hole, the second cavity, the third through hole, the fourth through hole, the third cavity and the pressure release installation port constitute the exhaust flow channel.

20. The battery device of claim 19, wherein, The projection of the first through hole and the projection of the second through hole have an overlapping part along the third direction when projected onto the same projection plane, The projection of the third through hole and the projection of the fourth through hole have an overlapping part along the first direction when projected onto the same projection plane.

21. The battery device of any one of claims 18-20, wherein, The battery box further comprises a flow guide cover, the flow guide cover comprising a cover body and a flow guide pipe body connected to each other, the cover body being connected to the end plate provided with the pressure release installation port, and the cover being arranged outside the first pressure release mechanism, the cover body and the end plate surrounding a flow converging cavity, one end of the flow guide pipe body being in communication with the flow converging cavity, and the other end being formed with an exhaust port.

22. The battery device of claim 21, wherein, A plurality of the first pressure release mechanisms are installed on the same end plate, and the cover body is arranged outside at least two of the first pressure release mechanisms.

23. The battery device of claim 21, wherein, The battery box further comprises an exhaust seal arranged between the cover body and the end plate.

24. The battery device of claim 21, wherein, The cover body and / or the flow guide pipe body are made of titanium alloy material.

25. The battery device of any one of claims 22-24, wherein, The cover body and the end plate are connected by fasteners.

26. The battery device of any one of claims 22-24, wherein, The cover body comprises a first cover wall opposite to the first pressure release mechanism along the third direction, and the distance between the first cover wall and the first pressure release mechanism along the third direction is greater than or equal to 15 mm.

27. An electrical device, comprising: The electric device comprises a plurality of battery devices as claimed in any one of claims 1 to 26, and the battery devices are used for storing or providing electric energy.

28. The powered device of claim 27, wherein, The electric device is an aircraft.

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