A battery device, a case assembly, and an electric appliance

Abstract

The application discloses a battery device, a box assembly and a power utilization equipment. The battery device comprises a box assembly and a battery cell. The box assembly is formed with a containing cavity. The box assembly comprises a first wall. The battery cell is accommodated in the containing cavity and is carried on the first wall. The first wall comprises an insulation structure layer and a fiber composite material layer which are arranged in a stack. In the thickness direction of the first wall, the insulation structure layer is located between the fiber composite material layer and the battery cell. The technical scheme provided by the application can take into account the structural strength and the protection performance.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device, housing assembly, and electrical equipment. Background Technology

[0002] Battery devices typically consist of a housing assembly and individual battery cells. The battery cells are housed inside the housing assembly, which provides support and protection for them. In some technical solutions, due to inadequate structure and material selection of the housing assembly, it is difficult to provide effective support and protection for the battery cells. Utility Model Content

[0003] To address the aforementioned technical problems, the purpose of this application is to provide a battery device, a housing assembly, and an electrical appliance.

[0004] The first aspect of this application provides a battery device, including a housing assembly and a battery cell. The housing assembly forms a receiving cavity and includes a first wall. The battery cell is housed in the receiving cavity and supported by the first wall. The first wall includes a laminated insulating structure layer and a fiber composite material layer. Along the thickness direction of the first wall, the insulating structure layer is located between the fiber composite material layer and the battery cell.

[0005] In the technical solution provided in this application embodiment, the housing assembly can accommodate individual battery cells and provide protection and restraint for them. The first wall of the housing assembly can support the individual battery cells. Based on this, the first wall includes a layered insulating structure layer and a fiber composite material layer. The fiber composite material layer provides good structural strength. Along the thickness direction of the first wall, the insulating structure layer is located between the fiber composite material layer and the individual battery cells. The insulating structure layer is made of insulating material and serves both to support the individual battery cells and to electrically isolate them from the outside environment, reducing external interference. The combination of the insulating structure layer and the fiber composite material layer ensures that the housing assembly balances structural strength and protective performance.

[0006] In some embodiments of this application, the housing assembly further includes a plurality of sidewalls, the first wall and the plurality of sidewalls defining a receiving cavity; the sidewalls include a laminated insulating structural layer and a fiber composite material layer, at least a portion of the insulating structural layer being located between the fiber composite material layer and the battery cell.

[0007] Here, in the side wall, the insulating structure layer is located between the fiber composite material layer and the battery cell. The insulating structure layer can electrically isolate the battery cell from the outside world, reducing external interference to the battery cell. The combination of the insulating structure layer and the fiber composite material layer allows the housing assembly to balance structural strength and protective performance.

[0008] In some embodiments of this application, the sidewall is configured as a hollow structure with a hollow cavity; the hollow cavity is located between the insulating structural layer and the fiber composite material layer of the first sidewall.

[0009] The hollow cavity effectively reduces the weight of the sidewalls, facilitating the lightweighting of the enclosure components. Furthermore, the hollow cavity serves as an insulation layer, improving the thermal management performance of the battery device. The structure of the hollow cavity can be flexibly configured to adapt to different design requirements.

[0010] In some embodiments of this application, the sidewall further includes a support structure located in the hollow cavity and abutting against at least one of the insulating structural layer and the fiber composite material layer of the sidewall.

[0011] Here, a support structure is set inside the hollow cavity to provide support for the insulation layer and the fiber composite material layer, which can improve the deformation resistance of the insulation layer and the fiber composite material layer. The support structure can also disperse impact and improve the structural stability of the box assembly.

[0012] In some embodiments of this application, the support structure includes a connecting layer and a first support body, wherein the connecting layer at least partially covers the first support body.

[0013] Here, a connecting layer is provided to facilitate the connection between the first support and the insulating structure layer / fiber composite material layer. The connecting layer at least partially covers the first support, which helps to increase the connection area, thereby improving the connection effect and enhancing the structural stability of the sidewall.

[0014] In some embodiments of this application, the connecting layer includes a fiber-reinforced composite material layer; the first support includes a foam layer.

[0015] Here, the fiber-reinforced composite material layer forms a bonding layer with good structural strength, and can also provide thermal insulation and corrosion resistance properties depending on the auxiliary materials. The foam layer forms the first support, which can mitigate impact, has a good supporting effect, and is lightweight, facilitating the weight reduction of the box structure.

[0016] In some embodiments of this application, the multiple sidewalls include two side plate members, the battery device includes a battery cell group, the battery cell group includes a plurality of battery cells stacked along a first direction, the two side plate members are disposed at opposite ends of the first wall along a second direction, the second direction intersects the first direction, at least a partial insulating structural layer forms the wall surface of the side plate member facing the receiving cavity, the fiber composite material layer forms the wall surface of the side plate member away from the receiving cavity, the connecting layer is located between the first support and the insulating structural layer, and / or, the connecting layer is located between the first support and the fiber composite material layer.

[0017] Here, two side plate components are provided, which are arranged on both sides of the first wall along the second direction. They can limit the expansion force or deformation of the battery cell along the second direction. The first support can provide good support in the second direction, and the insulating structure layer helps to electrically isolate the battery cell from the outside.

[0018] In some embodiments of this application, the support structure includes a second support body, the second support body includes a support plate having a support surface facing the insulating structure layer, the battery device includes a battery cell group, the battery cell group includes a plurality of battery cells stacked along a first direction, the first direction being the thickness direction of the support plate, along the first direction, the support surface of the support plate abuts against the insulating structure layer.

[0019] Here, the second support includes a support plate. The support surface of the support plate abuts against the insulating structure layer, providing good support for the insulating structure layer. The abutting direction of the support plate is along the first direction, which can effectively limit the deformation of the battery cell caused by the expansion force in the first direction and improve the structural stability of the housing assembly.

[0020] In some embodiments of this application, the second support further includes an extension plate connected to the support plate. The extension plate is connected to the side of the support plate facing the battery cell and extends along a first direction. Along the thickness direction of the first wall, the extension plate is located between the insulating structure layer and the fiber composite material layer of the first wall and projects onto the same projection plane along the thickness direction of the first wall. The projection of the extension plate overlaps with the projection of at least a portion of the battery cell.

[0021] Here, by setting up an extension plate, on the one hand, the extension plate provides support for the battery cells, enhancing the support capacity of the housing assembly; on the other hand, the extension plate extends into the first wall, improving the connection and integrity between the first wall and the side walls, which helps to improve the structural strength of the housing assembly.

[0022] In some embodiments of this application, the battery cell has a pressure relief section, and the pressure relief port of the battery cell is arranged such that it faces the first wall. The first wall has a through hole at a position corresponding to the pressure relief section. The extension plate has a first clearance notch and is projected onto the same projection plane along the thickness direction of the first wall. The projection of the pressure relief port of the pressure relief section is located within the projection of the first clearance notch and within the projection of the through hole.

[0023] Here, since the projections of the first clearance notch and the through hole completely cover the projection of the pressure relief port, the pressure relief airflow ejected from the pressure relief port passes through the through hole and the first clearance notch through the first wall, and is not likely to impact the first wall or the structure on it, so as to protect the housing assembly and other battery cells in it.

[0024] In some embodiments of this application, the second support body further includes a support rib connected to the support plate. Along the first direction, the support rib is located on the side of the support plate away from the battery cell assembly, and the support rib extends along the thickness direction of the support plate.

[0025] Here, by setting support ribs, the support ribs can improve the bending resistance of the support plate, and the support ribs extend along the thickness direction of the support plate, which can effectively limit the deformation of the battery cell caused by the expansion force in the first direction and improve the structural stability of the sidewall.

[0026] In some embodiments of this application, the support structure further includes a third support body located between the support plate and the fiber composite material layer, the third support body including a foam layer; or, the third support body is configured as a fiber composite material shell with an opening at at least one end, the opening facing the support plate.

[0027] Here, the third support enhances the structural strength of the sidewall and can also cooperate with other support structures on the sidewall to further improve its structural strength. The third support formed by the foam layer can mitigate impact, provide good support, and is lightweight, facilitating the weight reduction of the enclosure structure. The third support formed by the fiber composite shell has good structural strength and can also provide thermal insulation and corrosion resistance properties depending on the auxiliary materials. The open cavity can reduce weight, facilitating the weight reduction of the enclosure structure.

[0028] In some embodiments of this application, the multiple sidewalls include two side plate members and two beam members. A first support is provided in the hollow cavity of the side plate member, and at least a second support is provided in the hollow cavity of the beam member. The two beam members are connected to opposite ends of the first wall along a first direction, and the two side plate members are connected to opposite ends of the first wall along a second direction. Adjacent side plate members are connected to the beam members. The first direction and the second direction intersect each other and both intersect the thickness direction of the first wall. The battery device includes a battery cell group, and the battery cell group includes multiple battery cells stacked along the first direction.

[0029] Here, two side plate members and two beam members are provided. The two side plate members are arranged on both sides of the first wall along the second direction, which can restrict the expansion force or deformation of the battery cells in the second direction. The first support can provide good support in the second direction. The two beam members are arranged on both sides of the first wall along the first direction, which can restrict the expansion force or deformation of the battery cells in the first direction. The second support can provide good support in the first direction, so that the side plate members, beam members and the first wall can work together to form a structurally stable and load-bearing box assembly.

[0030] In some embodiments of this application, the support structure is provided with a mounting structure.

[0031] Here, the mounting structure can effectively secure the battery device to external components, thereby improving the connection stability of the battery device installed in other equipment. Furthermore, the mounting structure is located on the support structure, which, relying on the structural strength of the support structure, provides stable support and is less likely to affect other components of the first wall or side walls.

[0032] In some embodiments of this application, a portion of the insulating structural layer of the sidewall is configured as a flange, which is connected to the fiber composite material layer to form a connection structure.

[0033] Here, the insulating structural layer forming the inner wall of the cavity and the fiber composite material layer forming the outer wall of the housing assembly are connected by a connecting structure. The connecting structure includes a flange formed by the insulating structural layer, which helps to form a stable connecting structure, improves the connection strength between the insulating structural layer and the fiber composite material layer, and thus improves the structural stability of the housing assembly.

[0034] In some embodiments of this application, the connecting structure is located at the end of the sidewall opposite to the first wall along the thickness direction of the first wall, or the connecting structure is located on the side of the sidewall opposite to the receiving cavity along the thickness direction of the sidewall.

[0035] Here, the connecting structure is set on the top or outside of the side wall so that the insulating structure layer of the inner wall of the cavity extends to the outside of the housing assembly before being connected. This avoids the internal space of the cavity, so that the inner side of the cavity is completely covered by the insulating structure layer. This reduces the impact of the connecting structure on the internal structure of the cavity or the battery cell, and also makes assembly easier.

[0036] In some embodiments of this application, in the connection structure, the flange overlaps with the fiber composite material layer, or the flange is butt-jointed with the fiber composite material layer.

[0037] Here, the bent flange and the fiber composite material layer adopt an overlapping form, which has good sealing and connection performance, and can reduce the number of components and facilitate assembly; the flange and the fiber composite material layer adopt a butt joint structure, which has good flatness and the structure of individual components is simpler.

[0038] In some embodiments of this application, the housing assembly further includes an overlap layer, in which the flanged portion is mated to the fiber composite material layer, and the overlap layer at least covers the mating seam between the flanged portion and the fiber composite material layer.

[0039] Here, by setting an overlap layer, the overlap layer can cover the joint between the flange and the fiber composite material layer, which can improve the sealing effect and also help to improve the connection strength between the insulation structure layer and the fiber composite material layer.

[0040] In some embodiments of this application, the insulating structure layer includes a first fiber fabric, the fiber composite material layer includes a second fiber fabric, the first fiber fabric includes a plurality of first fibers, the second fiber fabric includes a plurality of second fibers, and the first fibers are different from the second fibers.

[0041] Here, the insulation structure includes a first fiber fabric woven from multiple first fibers, and the fiber composite material layer includes a second fiber fabric woven from multiple second fibers. The fiber fabric has high structural strength and load-bearing capacity, which helps to improve the load-bearing and protective capabilities of the enclosure components.

[0042] In some embodiments of this application, the density of the second fiber is less than the density of the first fiber.

[0043] Here, the insulation structure layer uses a high-density material, which helps to improve insulation performance; the fiber composite material layer uses a low-density material, which helps to reduce weight and facilitates the lightweight design of the battery device.

[0044] In some embodiments of this application, the first fiber includes at least one of glass fiber, basalt fiber, and aramid fiber; and / or, the second fiber includes at least one of carbon fiber and polyethylene fiber.

[0045] Here, the first and second fibers can be made of suitable materials according to requirements, so as to be applied to a variety of different scenarios and improve the adaptability of the battery device.

[0046] In some embodiments of this application, the first fiber is glass fiber and the second fiber is carbon fiber.

[0047] Here, the first fiber is glass fiber. The glass fiber prepreg has the advantages of excellent insulation performance, high structural strength and lightweight, so that the insulation structure layer containing glass fiber has better insulation performance, high structural strength and high elasticity, which can meet the impact resistance requirements and lightweight design of the enclosure assembly. The second fiber is carbon fiber. The fiber composite material layer made of carbon fiber has the advantages of high strength, low density, corrosion resistance and good thermal stability. It is lightweight and has good structural strength, which can meet the impact resistance requirements and lightweight design of the enclosure assembly.

[0048] In some embodiments of this application, the number of layers of the first fiber fabric in the insulating structure layer is less than or equal to the number of layers of the second fiber fabric in the fiber composite material layer.

[0049] Here, the use of fewer layers of first fiber fabric in the insulation structure layer helps to reduce material consumption and decrease the wall thickness of the housing assembly; the use of more layers of second fiber fabric in the fiber composite material layer helps to improve structural strength.

[0050] In some embodiments of this application, the number of layers of the first fiber fabric in the insulating structure layer is 1-3; and / or, the number of layers of the second fiber fabric in the fiber composite material layer is 2-15.

[0051] Here, setting the number of layers of the first fiber fabric in the first insulation layer within a suitable range allows for a significant reduction in the weight of the enclosure assembly while ensuring good insulation performance, thus facilitating lightweight design of the enclosure assembly. Similarly, maintaining the number of layers of the second fiber fabric in the fiber composite layer within a suitable range allows for minimizing the total thickness and weight of the fiber composite layer while ensuring its structural strength.

[0052] In some embodiments of this application, the first fiber is a continuous fiber, and at least a portion of the plurality of first fibers intersect each other; and / or, the second fiber is a continuous fiber, and at least a portion of the plurality of second fibers intersect each other.

[0053] Here, the continuously arranged first and second fibers provide better structural integrity, thus offering better structural strength for the insulation layer or fiber composite layer. The cross-arranged first and second fibers can enhance the structural strength of the first fiber fabric / second fiber braid, providing load-bearing capacity in multiple directions and reducing the likelihood of tearing.

[0054] In some embodiments of this application, the insulating structure layer includes a first substrate and a plurality of first fibers, wherein the first fibers are continuous fibers and at least a portion of the plurality of first fibers intersect each other; the first substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; the first fibers include at least one of glass fiber, basalt fiber, and aramid fiber; and / or, the fiber composite material layer includes a second substrate and a plurality of second fibers, wherein the second fibers are continuous fibers and at least a portion of the plurality of second fibers intersect each other; the second substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; the second fibers include at least one of carbon fiber and polyethylene fiber.

[0055] Here, polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin are selected as the first matrix material, which possesses excellent wear resistance, high toughness, adhesion, corrosion resistance, and heat resistance. Carbon fiber and polyethylene fiber are selected as the second fiber, which can reduce weight and provide higher strength. Using polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin as the second matrix material provides excellent wear resistance, high toughness, adhesion, corrosion resistance, and heat resistance. Using glass fiber, basalt fiber, and aramid fiber as the first fiber can achieve good structural strength and insulation properties.

[0056] In some embodiments of this application, the thickness of the insulating structure layer is less than or equal to the thickness of the fiber composite material layer; and / or, the thickness of the insulating structure layer is in the range of 0.1 mm to 1.0 mm, and the thickness of the fiber composite material layer is in the range of 1.0 mm to 2.5 mm.

[0057] Here, the thinner insulating structural layer helps to reduce the wall thickness of the housing assembly and lighten its weight while meeting insulation requirements; the thicker fiber composite material layer helps to improve structural strength, so as to provide a stable working environment for the battery cells.

[0058] In some embodiments of this application, the first wall further includes a reinforcing layer, which is stacked between the insulating structure layer and the fiber composite material layer. The reinforcing layer includes a fiber-reinforced composite material layer, which includes a third substrate and a third fiber. The third substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; the third fiber includes at least one of carbon fiber and polyethylene fiber.

[0059] Here, by setting a reinforcing layer, which includes a fiber-reinforced composite material layer, and the fiber-reinforced composite material layer includes a third substrate and a third fiber, the fiber-reinforced composite material layer has good insulation properties or structural strength, which helps to improve the protection and support capabilities of the first wall and meet more stringent requirements.

[0060] In some embodiments of this application, the thickness of the first wall is in the range of 1.3 mm to 2.4 mm.

[0061] Here, by keeping the thickness of the first wall within a suitable range, the weight of the first wall is reduced while improving its structural strength and insulation performance, which is beneficial for the lightweighting of the battery device.

[0062] In some embodiments of this application, the battery cell has a pressure relief portion, and the pressure relief port of the battery cell is arranged such that it faces the first wall. The first wall has a through hole that penetrates the first wall. The projection of the pressure relief port is located within the projection of the through hole along the thickness direction of the first wall on the same projection plane.

[0063] Here, since the projection of the through hole completely covers the projection of the pressure relief port, the pressure relief airflow ejected from the pressure relief port passes through the through hole and through the first wall, making it less likely to impact the first wall or the structure on it, so as to protect the housing assembly and other battery cells inside.

[0064] In some embodiments of this application, the battery device further includes a protective film disposed on the first wall and covering the through hole.

[0065] Here, by setting a protective membrane, the relative sealing of the cavity can be maintained, and the explosion-proof membrane can be broken when the pressure relief airflow is ejected from the pressure relief section, so that the pressure relief airflow can enter the through hole, thereby improving the safety performance of the battery device.

[0066] In some embodiments of this application, the battery device further includes a protective plate disposed on the side of the first wall opposite to the receiving cavity, and a pressure relief cavity is formed between the protective plate and the first wall, the pressure relief cavity communicating with the through hole.

[0067] Here, by setting up a protective plate, the protective plate can provide support and protection for the housing components. A pressure relief chamber is formed between the protective plate and the first wall. The pressure relief airflow ejected from the pressure relief port enters the pressure relief chamber through the through hole. Since the pressure relief chamber has a large space, it can effectively buffer the impact, reduce the risk of thermal runaway of the battery device, and improve the safety performance of the battery device.

[0068] In some embodiments of this application, the pressure relief chamber is selectively connected to the external environment.

[0069] Here, the pressure relief chamber is selectively connected to the external environment, which can keep the internal environment of the pressure relief chamber and the housing components isolated from the outside world, and can also release the pressure relief airflow in a timely manner when needed, thereby improving the safety of the battery device.

[0070] In some embodiments of this application, an exhaust flow path is formed in the pressure relief chamber, and the housing assembly also includes a pressure relief valve. The exhaust flow path is connected to the pressure relief valve, and the pressure relief valve is configured to open under the action of gas pressure in the exhaust flow path. When the pressure relief valve is open, the exhaust flow path is connected to the external environment.

[0071] Here, by installing a pressure relief valve in the exhaust flow path, the pressure relief valve can open in time under pressure to discharge the pressure relief airflow. It can also isolate the exhaust flow path from the external environment when the pressure is low. It can be adjusted independently to meet different usage requirements.

[0072] In some embodiments of this application, the battery device further includes a heat-absorbing component, which is disposed in the pressure relief chamber and is disposed opposite to the pressure relief portion of the battery cell.

[0073] Here, by setting up a heat-absorbing component, which is positioned relative to the pressure relief section, the pressure relief gas generated by the pressure relief section can be effectively conducted to the heat-absorbing component. On the one hand, the heat-absorbing component can absorb heat, thereby reducing the risk of battery cells running out of control due to high temperature. On the other hand, the heat-absorbing component can also block the impact of pressure relief gas, reduce the adverse effects of pressure relief gas on other components, and improve the safety performance of the battery device.

[0074] In some embodiments of this application, the heat-absorbing component includes at least a phase change layer made of a phase change material, wherein the first phase change temperature of the phase change material is in the range of 90°C to 150°C.

[0075] Here, by setting a phase change layer, the phase change material of the phase change layer can absorb or release heat. By setting the phase change temperature of the phase change layer within a suitable range, the phase change layer absorbs heat to reduce the possibility of thermal runaway of the battery cell and releases heat to reduce the possibility of low-temperature failure of the battery cell, so as to provide a suitable temperature environment for the battery cell. In addition, the absorption component containing the phase change layer can also effectively block the impact of the depressurized gas on other components by absorbing the heat of the depressurized gas.

[0076] In some embodiments of this application, the heat-absorbing component further includes a heat-conducting layer, and the heat-conducting layer and the phase change layer are stacked together, with the heat-conducting layer located at least on the side of the phase change layer near the pressure relief portion along the stacking direction.

[0077] Here, by setting a heat-conducting layer, the heat transfer efficiency between the pressure relief section and the phase change layer can be improved, the temperature regulation capability of the heat absorption component can be improved, and thus the safety performance of the battery device can be improved.

[0078] In some embodiments of this application, the battery device further includes a protective component disposed on the side of the first wall opposite to the receiving cavity, and an air-cooled chamber is formed between the protective component and the first wall. The protective component is provided with a first air outlet and a second air outlet communicating with the air-cooled chamber.

[0079] Here, an air-cooled chamber is set up. The heat exchange medium flowing in the air-cooled chamber can enter the air-cooled chamber through the first air outlet and exit the air-cooled chamber through the second air outlet. The heat exchange medium in the air-cooled chamber exchanges heat with the first wall, thereby realizing the heat exchange between the battery cells in the box assembly and the outside world, so as to maintain the battery cells at a suitable temperature.

[0080] In some embodiments of this application, the protective component includes a protective plate and a current collector. The protective plate is provided with a first air outlet and a second air outlet. The current collector is disposed between the protective plate and the first wall and forms a current collection cavity between the protective plate and the protective plate. The current collector is provided with a sub-flow outlet, which is connected to the ventilation and cooling chamber and the current collection cavity.

[0081] Here, by setting up a flow collector, which forms a flow collection cavity, and connecting the first air outlet and the second air outlet, it is possible to facilitate the inflow or outflow of the heat exchange medium and reduce turbulence. The sub-outlets of the flow collector can realize the distribution of the heat exchange medium, so as to distribute different flow rates of heat exchange medium to different positions in the air-cooled chamber, thereby improving the utilization rate of the heat exchange medium and facilitating the temperature equalization of the battery device.

[0082] In some embodiments of this application, a boss structure is formed on the current collector. The current collector includes a connected abutment portion and a protrusion portion. The abutment portion abuts against the protective plate, and the protrusion portion protrudes to the side away from the protective plate and towards the air-cooled chamber to form a boss structure. A current collecting cavity is formed between the protrusion portion and the protective plate, and the sub-flow outlet is located on the protrusion portion and opens towards the air-cooled chamber.

[0083] Here, the manifold forms a manifold cavity through a boss structure, which is simple in structure and has good sealing performance. The sub-port is set on the protrusion so that the sub-port can be connected to the manifold cavity. The sub-port faces the air-cooled chamber, which facilitates the flow of heat exchange medium between the manifold cavity and the air-cooled chamber.

[0084] In some embodiments of this application, the sub-flow port includes a first sub-flow port, which is projected onto the same projection plane along the thickness direction of the first wall. The projection of the first sub-flow port does not overlap with the projection of the first air passage and the projection of the second air passage.

[0085] Here, the first sub-flow port is staggered relative to the first air outlet / second air outlet, which helps the heat exchange medium to flow in the manifold and thus distribute it to different positions in the air-cooled chamber through different first sub-flow ports, so as to balance the flow rate of different first sub-flow ports.

[0086] In some embodiments of this application, the sub-flow port further includes a second sub-flow port, the opening area of ​​each first sub-flow port is larger than the opening area of ​​each second sub-flow port, and the second sub-flow port is disposed opposite to the first air outlet or the second air outlet.

[0087] Here, the second sub-port is positioned opposite to the first / second air outlet, which helps to reduce the impact of the heat exchange medium on the manifold. In other words, the heat exchange medium can be depressurized through the second sub-port, thereby improving the structural and connection stability of the manifold.

[0088] In some embodiments of this application, the battery cell has a pressure relief section, and the pressure relief port of the battery cell is arranged so that it faces the air-cooled chamber. The battery device also includes a heat absorption component, which is disposed in the air-cooled chamber and disposed on the protective plate opposite to the pressure relief section of the battery cell.

[0089] Here, by setting up a heat-absorbing component and an air-cooling chamber, the heat-absorbing component is positioned relative to the pressure relief section. The pressure relief airflow generated by the pressure relief section can be effectively conducted from the air-cooling chamber to the heat-absorbing component, which absorbs heat, thereby reducing the risk of battery cells running out of control due to high temperature. In addition, the air-cooling chamber has both heat exchange and pressure relief functions, realizing the functional reuse of a single chamber, which helps to improve space utilization and simplify the structure.

[0090] In some embodiments of this application, the heat-absorbing component includes at least a phase change layer made of a phase change material, wherein the first phase change temperature of the phase change material is in the range of 90°C to 150°C.

[0091] Here, by setting a phase change layer, the phase change material of the phase change layer can absorb or release heat. By setting the phase change temperature of the phase change layer within a suitable range, the phase change layer absorbs heat to reduce the possibility of thermal runaway of the battery cell and releases heat to reduce the possibility of low-temperature failure of the battery cell, so as to provide a suitable temperature environment for the battery cell.

[0092] In some embodiments of this application, the heat-absorbing component further includes a heat-conducting layer, and the heat-conducting layer and the phase change layer are stacked together, with the heat-conducting layer located at least on the side of the phase change layer near the pressure relief portion along the stacking direction.

[0093] Here, by setting a heat-conducting layer, the heat transfer efficiency between the pressure relief section and the phase change layer can be improved, the temperature regulation capability of the heat absorption component can be improved, and thus the safety performance of the battery device can be improved.

[0094] In some embodiments of this application, a separator is provided between the first wall and the protective plate. The separator abuts against the first wall and the protective plate respectively to define a pressure relief chamber. The heat absorption assembly is located in the pressure relief chamber. The separator is configured to break in the event of thermal runaway of a single battery cell, thereby connecting the pressure relief chamber with the current collector chamber.

[0095] Here, by setting a separator, the pressure relief chamber can be easily defined so as to keep the pressure relief chamber sealed relative to the external environment. The separator can also break under the action of the pressure relief airflow ejected from the pressure relief section so that the pressure relief airflow can enter the collector chamber and be discharged to the external environment through the collector chamber, thereby improving the safety performance of the battery device.

[0096] In some embodiments of this application, the battery cell has a pressure relief section, and the pressure relief port of the battery cell is arranged such that it faces the air-cooled chamber. The battery device also includes a heat absorption component, which is disposed in the air-cooled chamber and disposed on the current collector opposite to the pressure relief section of the battery cell.

[0097] Here, by setting up a heat-absorbing component and an air-cooling chamber, the heat-absorbing component is positioned relative to the pressure relief section. The pressure relief airflow generated by the pressure relief section can be effectively conducted from the air-cooling chamber to the heat-absorbing component, which absorbs heat, thereby reducing the risk of battery cells running out of control due to high temperature. In addition, the air-cooling chamber has both heat exchange and pressure relief functions, realizing the functional reuse of a single chamber, which helps to improve space utilization and simplify the structure.

[0098] In some embodiments of this application, the protective plate comprises a laminated structure formed by layers of fiber-reinforced composite materials.

[0099] Here, the protective plate formed by the fiber-reinforced composite material layer has good structural strength and can also provide heat insulation, corrosion resistance and other properties depending on the auxiliary materials.

[0100] In some embodiments of this application, the protective component is connected to the first wall, and the connection has a sealing structure.

[0101] Here, by setting a sealing structure at the connection between the protective component and the first wall, the pressure relief chamber and other cavities are isolated from the external environment, or the space of the air-cooled chamber and the collection chamber is limited, so as to maintain the integrity of the flow channel of the heat exchange medium / pressure relief airflow and reduce the possibility of leakage.

[0102] In some embodiments of this application, the battery device further includes a cover connected to the housing assembly to enclose the receiving cavity; the cover includes a laminated insulating structural layer and a fiber composite material layer, with the insulating structural layer located between the fiber composite material layer and the battery cell.

[0103] Here, by setting a cover, the cover can seal the cavity connected to the housing assembly, so as to isolate the space where the battery cell is located from the external environment. The cover includes an insulating structural layer and a fiber composite material layer. The fiber composite material layer provides good structural strength, while the insulating structural layer can electrically isolate the battery cell from the outside world and reduce external interference to the battery cell. The combination of the insulating structural layer and the fiber composite material layer allows the cover to take into account both structural strength and protective performance.

[0104] In some embodiments of this application, the housing assembly further includes a plurality of sidewalls, the first wall and the plurality of sidewalls defining a receiving cavity, and the end face of the sidewall opposite to the first wall along the thickness direction of the first wall being sealed to the cover.

[0105] Here, the cover is connected to the side wall, which is convenient and the sealed connection between the cover and the side wall helps to seal the cavity, thereby isolating the battery cells inside the cavity from the external environment.

[0106] In some embodiments of this application, there are multiple battery cells, and the multiple battery cells are arranged in a battery cell row along a first direction; the housing assembly also includes multiple side walls, the first wall and the multiple side walls define a receiving cavity, the side walls also include beam members arranged opposite to each other along the first direction, the battery device also includes a composite material pull plate, the composite material pull plate includes a main body and a connecting part, the connecting part is connected to the main body and located at both ends of the main body along the first direction, and the connecting part is connected to the beam member.

[0107] Here, the battery device is equipped with a composite tension plate. The composite tension plate effectively limits the battery cell array through the main body and the connecting part, which can restrict the expansion of the battery cell array. The connecting part of the composite tension plate is connected to the beam member so that part of the expansion force borne by the beam member can be transferred to the composite tension plate. In other words, the composite tension plate can share the expansion force of the battery cell with the beam member, thereby improving the modulus and strength of the housing assembly, especially improving the modulus of the housing assembly along the first direction, and reducing the probability of bending deformation of the beam member and / or reducing the amount of deformation when the beam member bends.

[0108] In some embodiments of this application, the composite pull plate includes at least one first pull plate extending along a first direction and covering at least a portion of the side of the battery cell array opposite to the first wall.

[0109] Here, the first pull plate covers the battery cell array along the thickness direction of the first wall, which can provide a limit for the battery cell array in the thickness direction of the first wall so as to fix the battery cell array to the housing assembly. The first pull plate can also resist the expansion force of the battery cells along the thickness direction of the first wall.

[0110] In some embodiments of this application, the composite pull plate further includes at least one second pull plate extending along a first direction and covering at least a portion of the side of the battery cell array.

[0111] Here, the second pull plate extends along the first direction and can cover at least part of the side of the battery cell array, thereby bearing the expansion force of the battery cell along the second direction, further improving the modulus and strength of the box assembly. The second pull plate is connected to the beam member, which can further improve the deformation constraint force on the beam member, thereby further improving the structural strength of the box assembly.

[0112] In some embodiments of this application, multiple battery cells are arranged in a second direction to form a battery cell array, and the second direction is intersected with the first direction; there are at least two second pull plates, and the second pull plates cover both sides of the battery cell array in the first direction.

[0113] Here, the second pull plate covers the surface of the battery cell array parallel to the first direction. The second pull plate and the first pull plate form an enclosing structure, which can provide limiting for the battery cell array from multiple directions in order to improve the structural strength of the housing assembly.

[0114] In some embodiments of this application, the composite sheet includes a fourth substrate and a fourth fiber. The fourth fiber is a continuous fiber and its extension direction is consistent with the first direction. The fourth fiber includes at least one of glass fiber, basalt fiber, and aramid fiber. The fourth substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0115] Here, the composite material formed by the fourth substrate and the fourth fiber has the characteristics of being lightweight and high-strength, which is beneficial to reducing the weight of the composite sheet and improving the structural strength of the composite sheet. Furthermore, the fourth fiber extends along the first direction, which can enhance the ability of the composite sheet to withstand the expansion force in the first direction.

[0116] In some embodiments of this application, the battery device further includes a sampling component located between the first pull plate and the battery cell array. The sampling component has at least one output component, and the first pull plate is provided with a second clearance notch, which is positioned corresponding to the output component.

[0117] Here, the second clearance notch can avoid the output component, improve the structural compactness of the housing assembly, and optimize the stress distribution of the first tension plate, thereby improving its structural strength.

[0118] In some embodiments of this application, the beam member is formed with at least one clearance groove, and the output member is at least partially located within the clearance groove.

[0119] Here, by forming at least one clearance groove in the beam member, the arrangement requirements of the sampling component in the battery device can be met, the output component can be easily connected to the external controller, and the structural compactness of the housing component can be improved, saving the internal space of the housing component.

[0120] In some embodiments of this application, the battery device further includes a busbar located between the battery cell array and the first pull plate, the first pull plate being bonded to the busbar.

[0121] Here, the busbar is bonded to the first pull plate, which helps to improve the connection strength and connection area between the first pull plate and the battery cell array. On the other hand, the first pull plate can also insulate the busbar from the external space, thereby improving the insulation performance of the battery device. The first pull plate also provides protection for the busbar, reducing the possibility of the busbar cracking due to deformation or disconnecting from the battery cells.

[0122] In some embodiments of this application, the insulating structural layer includes an insulating coating, which is selected from at least one of epoxy coating, silicone coating, polyurethane coating, fluorocarbon coating, silica coating, boron nitride coating, and vinyl resin coating.

[0123] Here, the insulating coating structure is thin and lightweight, and highly flexible and adaptable, making it suitable for complex structural surfaces.

[0124] A second aspect of this application provides a housing assembly including a housing wall defining a receiving cavity. The housing assembly includes a first wall, and the receiving cavity is used to accommodate a battery cell. The first wall includes an insulating structural layer and a fiber composite material layer stacked together. When a battery cell is placed in the receiving cavity, the battery cell is supported by the first wall. Along the thickness direction of the first wall, the insulating structural layer is located between the fiber composite material layer and the battery cell.

[0125] In the technical solution of this application embodiment, the housing assembly can accommodate battery cells and provide protection and restraint for the battery cells. The fiber composite material layer provides good structural strength. The insulating structure layer is used to support the battery cells and also to electrically isolate the battery cells from the outside world, reducing external interference to the battery cells. The combination of the insulating structure layer and the fiber composite material layer allows the housing assembly to take into account both structural strength and protective performance.

[0126] A third aspect of this application provides an electrical device including a battery device for providing electrical energy according to any one of the first aspects; or, including a plurality of battery cells and a housing assembly for accommodating the plurality of battery cells according to the second aspect.

[0127] In the technical solution of this application embodiment, the housing assembly can accommodate individual battery cells and provide protection and restraint for them. The fiber composite material layer provides good structural strength, and the insulating structural layer not only supports the battery cells but also electrically isolates them from the outside world, reducing external interference. The combination of the insulating structural layer and the fiber composite material layer ensures that the housing assembly balances structural strength and protective performance. Lightweight design of battery devices in aircraft, vehicles, and ships also helps improve the acceleration, top speed, and range of aircraft, vehicles, and ships.

[0128] In some embodiments of this application, the electrical equipment includes aircraft.

[0129] Here, the enclosure assembly can house individual battery cells and provide protection and restraint for them. The fiber composite material layer provides good structural strength, while the insulating layer not only supports the battery cells but also electrically isolates them from the outside environment, reducing external interference. The combination of the insulating and fiber composite material layers allows the enclosure assembly to balance structural strength and protective performance. Lightweight design of battery devices in aircraft also helps improve the acceleration, top speed, and range of aircraft, vehicles, and ships. Attached Figure Description

[0130] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0131] Figure 1 This is a schematic diagram of the structure of the electrical equipment provided in the embodiments of this application;

[0132] Figure 2 This is an exploded structural diagram of the battery device provided in the embodiments of this application;

[0133] Figure 3 A front view of the battery device provided in the embodiments of this application;

[0134] Figure 4 Provided for the embodiments of this application Figure 3 Schematic diagram of the cross-sectional structure of section AA;

[0135] Figure 5This is a schematic diagram of the structure of the housing assembly in the battery device provided in the embodiments of this application;

[0136] Figure 6 This is a partial top view of the battery device provided in an embodiment of this application;

[0137] Figure 7 Provided for the embodiments of this application Figure 6 Schematic diagram of the cross-sectional structure of section DD;

[0138] Figure 8 Provided for the embodiments of this application Figure 3 Schematic diagram of the cross-sectional structure of section BB in the middle;

[0139] Figure 9 Provided for the embodiments of this application Figure 6 Schematic diagram of the cross-sectional structure of the EE section;

[0140] Figure 10 Provided for the embodiments of this application Figure 6 Schematic diagram of the cross-sectional structure of the FF section;

[0141] Figure 11 An exploded view of the supporting structure in the battery device provided in the embodiments of this application;

[0142] Figure 12 A schematic diagram of the stacked structure of the housing assembly in the battery device provided in the embodiments of this application;

[0143] Figure 13 Provided for the embodiments of this application Figure 5 Schematic diagram of the cross-sectional structure of the C-section;

[0144] Figure 14 This is a schematic diagram of the structure of the second and third supports in the battery device provided in the embodiments of this application;

[0145] Figure 15 This is a schematic diagram of the structure of the third support and the battery cell in the battery device provided in the embodiments of this application;

[0146] Figure 16 This is a schematic diagram of the overlapping structure in the battery device provided in the embodiments of this application;

[0147] Figure 17 This is a schematic diagram of the docking structure in the battery device provided in the embodiments of this application;

[0148] Figure 18 This application provides schematic diagrams of the structure of fiber fabrics in some battery devices.

[0149] Figure 19Schematic diagrams of the structure of fiber fabrics in other battery devices provided in embodiments of this application;

[0150] Figure 20 This is a schematic diagram of the thickness of the structural layer in the battery device provided in the embodiments of this application;

[0151] Figure 21 This is a schematic diagram of the structure of the protective film in the battery device provided in the embodiments of this application;

[0152] Figure 22 A side view of the battery device provided in the embodiments of this application, including a protective component;

[0153] Figure 23 Provided for the embodiments of this application Figure 22 Schematic diagram of the cross-sectional structure of the GG section;

[0154] Figure 24 This is a schematic diagram of the structure of the protective film and through holes in the battery device provided in the embodiments of this application;

[0155] Figure 25 This is a schematic diagram of the structure of the protective plate and current collector in the battery device provided in the embodiments of this application;

[0156] Figure 26 This is a schematic diagram of the pressure relief valve structure of the battery device provided in the embodiments of this application;

[0157] Figure 27 This is a schematic diagram of the structure of the heat-absorbing component in the battery device provided in the embodiments of this application;

[0158] Figure 28 A front view of the battery device provided in the embodiments of this application, including a protective component;

[0159] Figure 29 Provided for the embodiments of this application Figure 28 Schematic diagram of the cross-sectional structure of section HH;

[0160] Figure 30 This is a schematic diagram of the structure of the protective plate in the battery device provided in the embodiments of this application;

[0161] Figure 31 This is a schematic diagram of the current collector in the battery device provided in the embodiments of this application;

[0162] Figure 32 This is a structural schematic diagram of the protective plate and the cabin shell in the electrical equipment provided in the embodiments of this application;

[0163] Figure 33 This is a schematic diagram of the structure of the air-cooled chamber and heat-absorbing component in the battery device provided in the embodiments of this application;

[0164] Figure 34 This is a schematic diagram of the structure of the separator in the battery device provided in the embodiments of this application;

[0165] Figure 35 This is a schematic diagram of the structure of the separator and current collector in the battery device provided in the embodiments of this application;

[0166] Figure 36 A schematic diagram of the structure of the battery device provided in the embodiments of this application, including a composite sheet;

[0167] Figure 37 A schematic diagram illustrating the arrangement of composite material tension plates in some battery devices provided in the embodiments of this application;

[0168] Figure 38 A schematic diagram illustrating the arrangement of composite material tension plates in some other battery devices provided in the embodiments of this application;

[0169] Figure 39 A top view of the composite sheet in the battery device provided in this application embodiment;

[0170] Figure 40 Provided for the embodiments of this application Figure 39 Schematic diagram of the cross-sectional structure of section II.

[0171] Explanation of reference numerals in the attached figures:

[0172] 100 - Box assembly; 110 - Receiving cavity; 120 - First wall; 121 - Through hole; 122 - Reinforcing layer; 130 - Side wall; 131 - Hollow cavity; 132 - Support structure; 1321 - Connecting layer; 1322 - First support body; 1323 - Second support body; 13231 - Support plate; 13232 - Extension plate; 13233 - First clearance notch; 13234 - Support rib; 1324 - Third support body; 133 - Side plate component; 134 - Beam component; 1341 - Clearance groove ; 135-Mounting structure; 140-Connecting structure; 141-Flanged edge; 142-Overlapping layer; 150-Protective film; 200-Battery cell pack; 210-Battery cell; 220-Battery cell row; 211-Pressure relief section; 300-Protective assembly; 310-Protective plate; 311-First air vent; 312-Second air vent; 313-Main structure; 314-Flanged structure; 315-Protruding structure; 320-Pressure relief chamber; 321-Exhaust flow path; 330-Pressure relief valve; 340-Collector Components; 340a-First current collector; 340b-Second current collector; 341-Sub-port; 3411-First sub-port; 3412-Second sub-port; 342-Abutting part; 343-Protrusion; 344-First extension structure; 345-Second extension structure; 350-Air-cooled chamber; 360-Current collector; 370-Separator; 400-Heat absorption assembly; 410-Phase change layer; 420-Heat-conducting layer; 500-Cover; 600-Composite pull plate; 610-Main body; 620-Connecting part; 630-First pull plate; 631-Second clearance notch; 640-Second pull plate; 700-Sampling component; 710-Output component; 800-Bus unit; 900-Nacelle shell; C10-Insulating structural layer; C11-First fiber fabric; C111-First fiber; C12-First substrate; C13-Insulating coating; C20-Fiber composite material layer; C21-Second fiber fabric; C211-Second fiber; C22-Second substrate; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0173] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0174] 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 application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0175] In the description of the embodiments of this application, 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 and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0176] 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 application. 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.

[0177] In the description of the embodiments in this application, 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0178] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0179] In the description of the embodiments of this application, 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 application according to the specific circumstances.

[0180] In the description of the embodiments of this application, 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.

[0181] With the development of clean energy, more and more devices are using electricity as their driving force, leading to the rapid development of power batteries, such as lithium-ion batteries, which can store a large amount of electrical energy and can be repeatedly charged and discharged. These power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields.

[0182] The battery apparatus mentioned in the embodiments of this disclosure 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.

[0183] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. 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 a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0184] 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. As an example, the individual battery cells may be battery modules, which can be housed within the housing by securing the battery modules to the housing.

[0185] As an example, battery cell assemblies can also be housed within a housing by directly fixing multiple battery cells to the housing. The interior of the housing forms a closed space to accommodate the battery cell assembly. Here, "closed" refers to covering or shutting down; it can be sealed or not sealed. The first housing can be a top cover or a bottom plate.

[0186] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0187] In some embodiments, the enclosure may be part of the chassis structure of the vehicle / aircraft. For example, a portion of the enclosure may be at least a part of the floor of the vehicle / aircraft, or a portion of the enclosure may be at least a part of the crossbeams and longitudinal beams of the vehicle / aircraft.

[0188] In this embodiment of the disclosure, 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.

[0189] In some examples, the battery cell is used to store or provide electrical energy, and the working medium of the battery cell can be lithium ions, sodium ions, magnesium ions, sodium lithium ions, lithium metal, sodium metal, lithium sulfur, nickel hydride, nickel cadmium, lead, etc. The embodiments of this application do not limit this.

[0190] In this embodiment, a battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrodes. During the charging and discharging process of the battery cell, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0191] In some embodiments, a battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0192] As an example, the battery cell 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 disclosure does not impose any particular limitations.

[0193] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also be provided with one or more.

[0194] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0195] The technical solutions described in this disclosure are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and aircraft.

[0196] Aircraft generally refer to machines that fly 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, 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.

[0197] Reference Figure 1 An aircraft typically includes an airframe (including a cabin shell 900) and a battery pack (including a housing assembly 100) located on the airframe and providing power to the airframe.

[0198] In some technical solutions, the battery device typically includes a housing assembly and individual battery cells. The individual battery cells are housed inside the housing assembly, which provides support and protection for them. However, in some technical solutions, due to unreasonable structure and material selection of the housing assembly—for example, if the housing assembly is made of metal, it may be heavy, have poor insulation performance, and be structurally complex, making it difficult to provide effective support and protection for the individual battery cells.

[0199] In view of this, embodiments of the present disclosure provide a battery device including a housing assembly that can accommodate individual battery cells and provide protection and restraint for the battery cells. A first wall of the housing assembly can support the battery cells. The first wall includes a laminated insulating structural layer and a fiber composite material layer. The fiber composite material layer provides good structural strength. Along the thickness direction of the first wall, the insulating structural layer is located between the fiber composite material layer and the battery cells. The insulating structural layer is made of insulating material and serves both to support the battery cells and to electrically isolate the battery cells from the outside environment, reducing external interference to the battery cells. The combination of the insulating structural layer and the fiber composite material layer allows the housing assembly to balance structural strength and protective performance.

[0200] This application addresses the problems existing in the aforementioned related technologies by proposing a battery device, referring to... Figure 2 , Figure 3 , Figure 4 and Figure 5 The battery device includes a housing assembly 100 and a battery cell 210. The housing assembly 100 forms a receiving cavity 110 and includes a first wall 120. The battery cell 210 is housed in the receiving cavity 110 and supported by the first wall 120. The first wall 120 includes an insulating structural layer C10 and a fiber composite material layer C20 stacked together. Along the thickness direction of the first wall 120, the insulating structural layer C10 is located between the fiber composite material layer C20 and the battery cell 210.

[0201] In this embodiment, the housing assembly 100 is used to house and fix the battery cell 210, and to provide protection for the battery cell 210. The housing assembly 100 can be approximately cylindrical, spherical, cuboid, or irregular in shape.

[0202] In some examples, the housing assembly 100 has a cuboid structure. The length and width directions of the housing assembly 100 are perpendicular to the direction of gravity, while the height direction is parallel to the direction of gravity. An opening is provided on one side of the housing assembly 100 perpendicular to its height, and a first wall 120 is provided on the other side; in other words, the first wall 120 is the bottom wall of the housing assembly 100. It should be noted that the first wall 120 can be the bottom wall of the housing assembly 100, or it can be a side wall or other structural wall of the housing assembly 100.

[0203] In this embodiment of the application, multiple battery cells 210 in the housing assembly 100 can be stacked along the length direction, width direction, or height direction. In some examples, multiple battery cells 210 are arranged along a first direction X to form a battery cell group 200, where the first direction X can be the length direction of the housing assembly 100; multiple battery cell groups 200 are arranged along a second direction Y to form a battery cell array, where the second direction Y can be the width direction of the housing assembly 100.

[0204] In some examples, the battery cell 210 is approximately a cuboid structure. The length direction of the battery cell 210 is set along a third direction Z, which can be the height direction of the shaped component. The thickness direction of the battery cell 210 is parallel to the first direction X, and the width direction of the battery cell 210 is parallel to the second direction Y. The surface of the battery cell 210 parallel to the second direction Y and the third direction Z is its large surface, which is the surface with the largest area among the multiple surfaces of the component.

[0205] In this embodiment, the first direction X, the second direction Y, and the third direction Z are arranged at angles to each other, and these angles can be obtuse, acute, or right. In some examples, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0206] In this embodiment, the insulating structural layer C10 and the fiber composite material layer C20 are stacked, specifically, both the insulating structural layer C10 and the fiber composite material layer C20 are plate-like structures. Projecting along the thickness direction of the plate-like structure, the projections of the insulating structural layer C10 and the fiber composite material layer C20 at least partially overlap, so that the insulating structural layer C10 and the fiber composite material layer C20 are stacked together to form an integral laminate. The stacking direction of the insulating structural layer C10 and the fiber composite layer corresponds to the wall thickness direction of the structural wall, which can be the first wall 120 of the housing assembly 100 or other walls.

[0207] It should be noted that the C10 insulating structural layer and the composite material layer included in the structural wall can be integrally bonded together, or they can be partially connected, forming gaps or cavities in some locations. In addition, the structural wall may also include one or more laminates, or different wall surfaces of the structural wall can be formed by bending a laminate.

[0208] In this embodiment, the insulating structural layer C10 can be made of a single material or a composite material, and the fiber composite material layer C20 is made of a composite material. A composite material refers to a composite material composed of two or more materials with different physical or chemical properties.

[0209] In some examples, the composite material includes a substrate and auxiliary materials. The substrate encapsulates, supports, and connects the auxiliary materials, which in turn enhance chemical or physical properties such as structural strength and insulation. The auxiliary materials are pre-impregnated in the substrate and form a structural layer.

[0210] In this embodiment, the first wall 120 is provided with an insulating structure layer C10 on the inner side of the cavity 110, or the first wall 120 is provided with an insulating structure layer C10 on a portion of the inner side of the cavity 110. It is understood that the insulating layer provided as a whole has a better insulation effect.

[0211] In the technical solution provided in this application embodiment, the housing assembly 100 can accommodate the battery cell 210 and provide protection and limit for the battery cell 210. The first wall 120 of the housing assembly 100 can carry the battery cell 210 and provide support for the battery cell 210.

[0212] Based on this, the first wall 120 includes a laminated insulating structural layer C10 and a fiber composite material layer C20. The fiber composite material layer C20 provides good structural strength. Along the thickness direction of the first wall 120, the insulating structural layer C10 is located between the fiber composite material layer C20 and the battery cell 210. The insulating structural layer C10 is made of insulating material. The insulating structural layer C10 is used to support the battery cell 210 and also to electrically isolate the battery cell 210 from the outside world, reducing external interference to the battery cell 210. The combination of the insulating structural layer C10 and the fiber composite material layer C20 allows the housing assembly 100 to take into account both structural strength and protective performance.

[0213] Reference Figure 2 , Figure 3 Figure 4 and Figure 5 In some embodiments, the housing assembly 100 further includes a plurality of sidewalls 130, the first wall 120 and the plurality of sidewalls 130 defining a receiving cavity 110; the sidewalls 130 include a laminated insulating structural layer C10 and a fiber composite material layer C20, at least a portion of the insulating structural layer C10 being located between the fiber composite material layer C20 and the battery cell 210.

[0214] In this embodiment, the sidewall 130 provides a constraint on the battery cell 210, thereby confining the battery cell 210 within the receiving cavity 110; the sidewall 130 can also limit the deformation of the battery cell 210 and the housing assembly 100 in the event of expansion of the battery cell 210, thereby improving the safety of the battery device.

[0215] In some examples, the sidewall 130 can be a plate-like structure, the cross-section of the sidewall 130 can be square, trapezoidal, etc., and the surface of the sidewall 130 can be a plane or an arc surface. The structures of multiple sidewalls 130 can be the same or different. For example, along the extension direction of the first wall 120, the sidewalls 130 arranged opposite each other adopt the same or similar structural forms.

[0216] In this embodiment, the side wall 130 and the first wall 120 together form a receiving cavity 110. The first wall 120 and the side wall 130 can be integrally formed, or they can be connected by means of bonding, welding, snap-fitting, fastener connection, etc.

[0217] In this embodiment, the number of sidewalls 130 can be two or more. The sidewalls 130 are connected to the first wall 120, and multiple sidewalls 130 are connected end to end to form a closed structure. In some examples, there are four sidewalls 130, and the four sidewalls 130 and the first wall 120 enclose an approximately rectangular receiving cavity 110.

[0218] In some examples, the sidewall 130 is provided with an insulating structure layer C10 on the inner side of the cavity 110, or the sidewall 130 is provided with an insulating structure layer C10 on a portion of the inner side of the cavity 110. It is understood that the insulating layer provided as a whole has a better insulation effect.

[0219] In some examples, at least a portion of the first wall 120 corresponding to the outer side of the receiving cavity 110 may also be provided with an insulating structural layer C10, and correspondingly, at least a portion of the side wall 130 corresponding to the outer side of the receiving cavity 110 may also be provided with an insulating structural layer C10. This arrangement ensures both the protective effect and facilitates the connection between the insulating structural layer C10 and the fiber composite material layer C20.

[0220] In the technical solution of this application embodiment, in the side wall 130, the insulating structure layer C10 is located between the fiber composite material layer C20 and the battery cell 210. The insulating structure layer C10 can electrically isolate the battery cell 210 from the outside world and reduce the interference of the outside world to the battery cell 210. The combination of the insulating structure layer C10 and the fiber composite material layer C20 allows the housing assembly 100 to take into account both structural strength and protective performance.

[0221] Reference Figure 6 and Figure 7In some embodiments, the sidewall 130 is configured as a hollow structure having a hollow cavity 131; the hollow cavity 131 is located between the insulating structural layer C10 and the fiber composite material layer C20 of the sidewall 130.

[0222] In this embodiment, the hollow cavity 131 formed by the sidewall 130 can be a hollow structure formed by multiple layers of the sidewall 130, or it can be a hollow structure formed by the insulating structural layer C10 and the fiber composite material layer C20 of the sidewall 130. The hollow cavity 131 can be provided on a portion of the sidewall 130, or it can be provided on all of the sidewalls 130.

[0223] In some examples, the insulating structural layer C10 and the fiber composite material layer C20 of the sidewall 130 enclose a hollow structure. It should be noted that multiple sidewalls 130 can adopt different structures, and the formation method, structure, size, position, etc. of the hollow cavity 131 can be set differently for sidewalls 130 at different positions of the housing assembly 100.

[0224] The technical solution of this application embodiment, by providing a hollow cavity 131, can effectively reduce the weight of the sidewall 130, which is beneficial to the lightweighting of the housing assembly 100. Furthermore, the hollow cavity 131 can also serve as a heat insulation layer, improving the thermal management performance of the battery device. The structure of the hollow cavity 131 can be flexibly configured to adapt to different design requirements.

[0225] Reference Figure 5 , Figure 6 , Figure 8 and Figure 9 In some embodiments, the sidewall 130 further includes a support structure 132 located in the hollow cavity 131 and abutting against at least one of the insulating structural layer C10 and the fiber composite material layer C20 of the sidewall 130.

[0226] In this embodiment, the support structure 132 can be a columnar structure, a ribbed structure, a shell structure, a plate structure, a mesh structure, a honeycomb structure, a filling structure, etc. One or more support structures 132 can be provided in the hollow cavity 131.

[0227] In this embodiment, the support structure 132 may abut against the insulating structure layer C10, or against the fiber composite material layer C20, or one side of the support structure 132 may abut against the insulating structure layer C10, and the other side of the support structure 132 may abut against the fiber composite material layer C20.

[0228] In this embodiment, the support structure 132 can also be connected to the corresponding insulating structure layer C10 and fiber composite material layer C20 by means of snap-fitting, bonding, welding, fastener connection, riveting, etc., thereby improving the connection strength.

[0229] The technical solution of this application embodiment provides a support structure 132 in the hollow cavity 131. The support structure 132 provides support for the insulation structure layer C10 and the fiber composite material layer C20, which can improve the deformation resistance of the insulation structure layer C10 and the fiber composite material layer C20. The support structure 132 can also disperse impact and improve the structural stability of the box assembly 100.

[0230] Reference Figure 10 In some embodiments, the support structure 132 includes a connecting layer 1321 and a first support body 1322, wherein the connecting layer 1321 at least partially covers the first support body 1322.

[0231] In the embodiments of the application, the connecting layer 1321 is used to connect the corresponding insulating structure layer C10 and / or fiber composite material layer C20. The connecting layer 1321 and the corresponding insulating structure layer C10 and fiber composite material layer C20 can be connected by means of snap-fit, bonding, welding, fastener connection, riveting, etc.

[0232] In some examples, the connecting layer 1321 is integrally formed with the corresponding insulating structural layer C10 and fiber composite material layer C20; in other examples, the connecting layer 1321 is adhesively fixed with the corresponding insulating structural layer C10 and fiber composite material layer C20.

[0233] In this embodiment, the first support 1322 is used to provide support. The first support 1322 can be a block structure, a column structure, a plate structure, or a combination of multiple structures. In some examples, the first support 1322 is a cuboid block structure.

[0234] In this embodiment, the connecting layer 1321 and the supporting structure 132 can be connected by means of integral molding, bonding, abutment, welding, riveting, etc.

[0235] In this embodiment, the connecting layer 1321 may cover at least a portion of the first support 1322. In other words, the connecting layer 1321 is disposed on at least two surfaces of the first support 1322, or the connecting layer 1321 is disposed on the entire first support 1322. In some examples, the connecting layer 1321 is disposed between the first support 1322 and the insulating structure layer C10.

[0236] The technical solution of this application embodiment provides a connecting layer 1321 to facilitate the connection between the first support 1322 and the insulating structure layer C10 / fiber composite material layer C20. The connecting layer 1321 at least partially covers the first support 1322, which helps to increase the connection area, thereby improving the connection effect and enhancing the structural stability of the sidewall 130.

[0237] In some embodiments, the connecting layer 1321 includes a fiber-reinforced composite material layer; the first support 1322 includes a foam layer.

[0238] In this embodiment, the fiber-reinforced composite material layer forming the connecting layer 1321 is made of composite material, which may include carbon fiber reinforced composite material, glass fiber reinforced composite material, aramid fiber reinforced composite material, etc. It is understood that fiber-reinforced composite materials with different auxiliary materials can have different properties such as heat insulation and corrosion resistance.

[0239] In this embodiment, the connecting layer 1321 can be formed by stacking one or more fiber-reinforced composite material layers. The number of fiber-reinforced composite material layers can be set according to requirements; a smaller number of layers is lighter, while a larger number of layers helps to improve the connection strength.

[0240] In this embodiment, the foam layer included in the first support 1322 may be one or more of polyurethane foam, polystyrene foam, polypropylene foam or metal foam.

[0241] The technical solution of this application embodiment features a fiber-reinforced composite material layer 1321 that provides good structural strength and, depending on the auxiliary materials, offers properties such as heat insulation and corrosion resistance. The first support 1322 formed by the foam layer can mitigate impact, providing excellent support, and is lightweight, facilitating the weight reduction of the box structure.

[0242] Reference Figure 11 and Figure 12 In some embodiments, the plurality of sidewalls 130 include two side plate members 133, the battery device includes a battery cell group 200, the battery cell group 200 includes a plurality of battery cells 210 stacked along a first direction X, the two side plate members 133 are disposed at opposite ends of the first wall 120 along a second direction Y, the second direction Y intersects the first direction X, at least a partial insulating structural layer C10 forms the wall surface of the side plate member 133 facing the receiving cavity 110, the fiber composite material layer C20 forms the wall surface of the side plate member 133 away from the receiving cavity 110, the connecting layer 1321 is located between the first support 1322 and the insulating structural layer C10, and / or, the connecting layer 1321 is located between the first support 1322 and the fiber composite material layer C20.

[0243] In this embodiment, the two side plate members 133 may adopt the same or different structures. In some examples, the two side plates adopt the same structure. The side plate member 133 includes an insulating structural layer C10 and a fiber composite material layer C20. At least part of the insulating structural layer C10 forms the wall surface of the side plate member 133 facing the receiving cavity 110. In other words, the insulating structural layer C10 serves as the inner wall of the side plate member 133 relative to the receiving cavity 110. The fiber composite material layer C20 forms the wall surface of the side plate member 133 away from the receiving cavity 110. In other words, the fiber composite material layer C20 serves as the outer wall of the side plate member 133 relative to the receiving cavity 110.

[0244] In some examples, a hollow cavity 131 is formed between the insulating structural layer C10 and the fiber composite material layer C20. The hollow cavity 131 contains a first support 1322. At least a portion of the surface of the first support is covered with a connecting layer 1321, which is connected to the contacting insulating structural layer C10 and fiber composite material layer C20.

[0245] In some examples, the connecting layer 1321 is located between the first support 1322 and the insulating structure layer C10; in other examples, the connecting layer 1321 is located between the first support 1322 and the fiber composite material layer C20; in still other examples, the connecting layer 1321 is provided between the first support 1322 and the insulating structure layer C10, and between the first support 1322 and the fiber composite material layer C20.

[0246] In this embodiment, the position of the side plate member 133 can be associated with the arrangement of the battery cells 210. The side plate member 133 corresponds to the side of the battery cell group 200 and to a plurality of battery cells 210 in the battery cell group 200. The side plate member 133 can be located on both sides of the battery cell 210 along the width direction; in other words, the extension direction of the side plate member 133 is parallel to the thickness direction of the battery cell 210.

[0247] The technical solution of this application embodiment provides two side plate components 133, which are disposed on both sides of the first wall 120 along the second direction Y. They can limit the expansion force or deformation of the battery cell 210 along the second direction Y. The first support body 1322 can provide good support in the second direction Y. The insulating structure layer C10 helps to electrically isolate the battery cell 210 from the outside.

[0248] Reference Figure 9 , Figure 11 and Figure 13In some embodiments, the support structure 132 includes a second support body 1323, the second support body 1323 including a support plate 13231 having a support surface facing the insulating structure layer C10, and the battery device including a battery cell group 200, the battery cell group 200 including a plurality of battery cells 210 stacked along a first direction X, the first direction X being the thickness direction of the support plate 13231, and along the first direction X, the support surface of the support plate 13231 abuts against the insulating structure layer C10.

[0249] In this embodiment, the second support 1323 is used to provide support along the first direction X. The second support 1323 can be a block structure, a column structure, a plate structure, or a combination of multiple structures. In some examples, the second support structure 132 includes a support plate 13231, the support surface of which faces the insulating structural layer C10.

[0250] In this embodiment, the first direction X can be a direction perpendicular to the large surface area of ​​the battery cell 210. In some examples, the large surface area of ​​the battery cell 210 is relatively large, making it prone to thermal expansion and deformation. In this case, the first direction X is the direction in which the expansion force of the battery cell 210 is greater. The second support 1323 is used to limit the deformation of the battery cell 210 caused by the expansion force.

[0251] In this embodiment, the supporting surface of the supporting plate 13231 abuts against the insulating structure layer C10, which can be partial abutment or the supporting surface of the supporting plate 13231 and the surface of the insulating structure layer C10 can be fully bonded.

[0252] In this embodiment of the application, the support plate 13231 can also be connected to the corresponding insulating structure layer C10. The support plate 13231 and the corresponding insulating structure layer C10 can be connected by means of snap-fit, bonding, welding, fastener connection, riveting, etc.

[0253] In the technical solution of this application embodiment, the second support 1323 includes a support plate 13231. The support surface of the support plate 13231 abuts against the insulating structure layer C10, providing good support for the insulating structure layer C10. The abutting direction of the support plate 13231 is along the first direction X, which can effectively limit the deformation of the battery cell 210 caused by the expansion force in the first direction X, and improve the structural stability of the housing assembly 100.

[0254] Reference Figure 9 , Figure 11 and Figure 13In some embodiments, the second support 1323 further includes an extension plate 13232 connected to the support plate 13231. The extension plate 13232 is connected to the side of the support plate 13231 facing the battery cell 210 and extends along the first direction X. Along the thickness direction of the first wall 120, the extension plate 13232 is located between the insulating structure layer C10 and the fiber composite material layer C20 of the first wall 120. It is projected onto the same projection plane along the thickness direction of the first wall 120, and the projection of the extension plate 13232 overlaps with the projection of at least a portion of the battery cell 210.

[0255] In this embodiment, the second support 1323 may further include an extension plate 13232, which is connected to the support plate 13231. The two can be integrally formed or connected by means of bonding, welding, snap-fitting, fastener connection, etc. In some examples, the extension plate 13232 and the support plate 13231 are integrally formed and extend in different directions.

[0256] In this embodiment, the extension plate 13232 extends along the first direction X, specifically by having its large surface parallel to the first direction X. The extension plate 13232 extends along a direction close to the receiving cavity 110, and can extend to the position of the first wall 120, thereby providing support for a portion of the battery cells 210. In other words, when projected along the thickness direction (third direction Z) of the first wall 120, the projection of the extension plate 13232 overlaps with the projection of at least a portion of the battery cells 210.

[0257] In some examples, the projection of the extension plate 13232 overlaps with the projection of at least one battery cell 210, and the support plate 13231 may be connected to multiple extension plates 13232. For example, each support plate 13231 is connected to one extension plate 13232 corresponding to each battery cell group 200.

[0258] In this embodiment of the application, the extension plate 13232 is located between the insulating structural layer C10 and the fiber composite material layer C20 of the first wall 120, and the extension plate 13232 can be connected to at least one of the insulating structural layer C10 and the fiber composite material layer C20 of the first wall 120.

[0259] The technical solution of this application embodiment, by setting an extension plate 13232, on the one hand, provides support for the battery cell 210, enhancing the support capacity of the housing assembly 100; on the other hand, the extension plate 13232 extends into the first wall 120, improving the connection and integrity between the first wall 120 and the side wall 130, which helps to improve the structural strength of the housing assembly 100.

[0260] Reference Figure 9 , Figure 11 and Figure 15In some embodiments, the battery cell 210 has a pressure relief portion 211, and the battery cell 210 is arranged such that the pressure relief port of the pressure relief portion 211 faces the first wall 120. The first wall 120 has a through hole 121 at a position corresponding to the pressure relief portion 211. The extension plate 13232 has a first clearance notch 13233, which is projected onto the same projection plane along the thickness direction of the first wall 120. The projection of the pressure relief port of the pressure relief portion 211 is located within the projection of the first clearance notch 13233 and within the projection of the through hole 121.

[0261] In this embodiment, the pressure relief section 211 is used to release internal gas when the internal pressure of the battery cell 210 rises abnormally (such as in the case of overcharging, overheating, or short circuit), thereby preventing the battery from exploding or catching fire. In some examples, the pressure relief section 211 is located on the side of the battery cell 210 facing the first wall 120, and the pressure relief section 211 may also be located on other surfaces of the battery cell 210.

[0262] In some examples, the pressure relief section 211 includes a safety valve. If the gas pressure inside the battery cell 210 exceeds the pressure threshold of the safety valve, it can be released through the safety valve. That is, the gas inside the battery cell 210 flows out through the pressure relief port, thereby reducing the pressure inside the battery cell 210.

[0263] In this embodiment of the application, the first wall 120 has a through hole 121 formed at the pressure relief port of the pressure relief part 211. The through hole 121 can correspond to a single battery cell 210 or multiple battery cells 210 in the battery cell group 200.

[0264] In some examples, the extension plate 13232 is provided with a first clearance notch 13233. Projected along the thickness direction (third direction Z) of the first wall 120, the projection of the pressure relief port is located within the projection of the first clearance notch 13233, and the projection of the pressure relief port is located within the projection of the through hole 121. In other words, the projections of the through hole 121 and the first clearance notch 13233 completely cover the projection of the pressure relief port. The projections of the through hole 121 and the first clearance notch 13233 may partially overlap or completely overlap.

[0265] In the technical solution of this application embodiment, since the projections of the first clearance notch 13233 and the through hole 121 completely cover the projection of the pressure relief port, the pressure relief airflow ejected from the pressure relief port passes through the through hole 121 and the first clearance notch 13233 through the first wall 120, and is not likely to impact the first wall 120 or its structure, so as to protect the housing assembly 100 and other battery cells 210 therein.

[0266] Reference Figure 11In some embodiments, the second support 1323 further includes a support rib 13234 connected to the support plate 13231. Along the first direction X, the support rib 13234 is located on the side of the support plate 13231 away from the battery cell pack 200, and the support rib 13234 extends along the thickness direction of the support plate 13231.

[0267] In this embodiment, the second support 1323 further includes a support rib 13234, which is connected to the support plate 13231. The two can be integrally formed or connected by means of bonding, welding, snap-fitting, fastener connection, etc. In some examples, the support rib 13234 and the support plate 13231 are integrally formed and extend in different directions.

[0268] In some examples, the support rib 13234 is located on the side of the support plate 13231 opposite to the receiving cavity 110; in other words, the support rib 13234 is disposed between the support plate 13231 and the fiber composite material layer C20. In some examples, the second support 1323 includes both the extension plate 13232 and the support rib 13234, which are disposed on opposite sides of the support plate 13231.

[0269] In this embodiment of the application, the extension direction of the support rib 13234 is set at an angle to the extension direction of the support plate 13231 so that the support rib 13234 provides support for the support plate 13231 and improves the bending resistance of the support plate 13231. In some examples, the support rib 13234 extends along the thickness direction (first direction X) of the support plate 13231.

[0270] In this embodiment of the application, the support plate 13231 may be connected to one or more support ribs 13234. In some examples, the multiple support ribs 13234 are arranged sequentially relative to the support plate 13231 along the second direction Y, and the multiple support ribs 13234 may adopt the same or different structures.

[0271] The technical solution of this application embodiment, by setting support ribs 13234, can improve the bending resistance of support plate 13231, and the support ribs 13234 extend along the thickness direction of support plate 13231, which can effectively limit the deformation of battery cell 210 caused by expansion force in the first direction X, and improve the structural stability of sidewall 130.

[0272] Reference Figure 9 , Figure 11 , Figure 13 and Figure 15In some embodiments, the support structure 132 further includes a third support 1324 located between the support plate 13231 and the fiber composite material layer C20, and the third support 1324 includes a foam layer; or, the third support 1324 is configured as a fiber composite shell with an opening at at least one end facing the support plate 13231.

[0273] In this embodiment, the third support 1324 is used to provide support. The third support 1324 can be a block structure, a column structure, a plate structure, or a combination of multiple structures.

[0274] In this embodiment, the third support 1324 is located between the support plate 13231 and the fiber composite material layer C20. The third support 1324 may be connected to the support plate 13231, or the third support 1324 may be connected to the fiber composite material; or the third support 1324 may be connected to both the support plate 13231 and the fiber composite material.

[0275] In this embodiment, the third support 1324 can be disposed independently on the side wall 130, or the third support 1324 can cooperate with the first support 1322 or the second support 1323. In some examples, the third support 1324 and the second support 1323 abut against each other.

[0276] In this embodiment, the third support 1324 may include at least one of polyphenylene ether, polyethylene terephthalate, polyurethane, polymethacrylamide, epoxy foam, and metal material.

[0277] In some examples, the third support 1324 comprises polyphenylene ether, which has advantages such as high heat resistance, high insulation, and strong chemical stability.

[0278] In some examples, the third support 1324 comprises polyethylene terephthalate, which has advantages such as high strength and toughness, corrosion resistance, and ease of processing.

[0279] In some examples, the third support 1324 comprises polyurethane, which has advantages such as good wear resistance and strong adhesion.

[0280] In some examples, the third support 1324 includes polymethacrylimide, which has advantages such as light weight, high temperature resistance, and easy molding.

[0281] In some examples, the third support 1324 includes epoxy foam, which has advantages such as corrosion resistance, strong adhesion, good thermal stability, and light weight.

[0282] In some examples, the third support 1324 comprises a metallic material, which has advantages such as high strength, good thermal conductivity, and good durability.

[0283] In this embodiment, the second support 1323 and the third support 1324 may be made of the same or different materials. In some examples, the third support 1324 includes a foam layer, which has good support effect and is lightweight. The second support 1323 is made of the same material as the fiber composite material layer C20.

[0284] In some examples, the foam layer can be one or more of polyurethane foam, polystyrene foam, polypropylene foam, or metal foam. The support ribs 13234 of the second support 1323 can be embedded in the foam layer.

[0285] In some examples, the third support 1324 constitutes a fiber composite shell, which may be made of fiber-reinforced composite material. The fiber composite shell may include one or more chambers, each with an opening facing the support plate 13231, so that the third support 1324 and the second support 1323 cooperate to form a structure that closes the chambers.

[0286] In this embodiment, the multiple chambers of the fiber composite shell can adopt the same or different structures, and the multiple chambers can be distributed along a rectangular or circular array.

[0287] In this embodiment of the application, the fiber composite shell includes a fiber-reinforced composite material layer, which may include a third substrate and a third fiber. The third substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; the third fiber includes at least one of carbon fiber and polyethylene fiber.

[0288] In this embodiment of the technical solution, the third support 1324 can enhance the structural strength of the sidewall 130, and the third support 1324 can also cooperate with other support structures 132 of the sidewall 130 to further improve the structural strength of the sidewall 130. The third support 1324 formed by the foam layer can mitigate impact, has a good support effect, and is lightweight, which facilitates the lightweighting of the box structure. The third support 1324 formed by the fiber composite shell has good structural strength, and can also provide heat insulation, corrosion resistance and other properties according to the auxiliary materials. The open cavity can reduce weight and facilitate the lightweighting of the box structure.

[0289] Reference Figure 5 , Figure 11 and Figure 12In some embodiments, the multiple sidewalls 130 include two side plate members 133 and two beam members 134. A first support 1322 is provided in the hollow cavity 131 of the side plate member 133, and at least a second support 1323 is provided in the hollow cavity 131 of the beam member 134. The two beam members 134 are connected to the two opposite ends of the first wall 120 along the first direction X, and the two side plate members 133 are connected to the two opposite ends of the first wall 120 along the second direction Y. Adjacent side plate members 133 are connected to beam members 134. The first direction X and the second direction Y intersect each other and both intersect the thickness direction of the first wall 120. The battery device includes a battery cell group 200, which includes a plurality of battery cells 210 stacked along the first direction X.

[0290] In this embodiment, different sidewalls 130 can be provided with different support structures 132, and different support structures 132 in the same sidewall 130 can be provided individually or in combination with each other.

[0291] In this embodiment, the side plate member 133 and the beam member 134 may employ the same or different structures. In some examples, the side plate member 133 and the beam member 134 employ different structures. The two side plate members 133 are disposed opposite each other at both ends of the first wall 120 along the second direction Y, and the side plate members 133 are used to limit the battery cell 210 along the second direction Y; the two beam members 134 are disposed opposite each other at both ends of the first wall 120 along the first direction X, and the beam members 134 are used to limit the battery cell 210 along the first direction X. The beam member 134 corresponds to the large surface of the battery cell 210, and the load-bearing capacity of the beam member 134 is greater than that of the side plate member 133.

[0292] In some examples, the side plate member 133 is a cuboid structure, and the beam member 134 is a structure with an approximately trapezoidal cross section. In other words, the size of the beam member 134 gradually decreases along the first direction X away from the first wall 120 in the thickness direction (third direction Z).

[0293] In this embodiment, the two side plate members 133 may adopt the same or different structures. In some examples, the two side plates adopt the same structure. The side plate member 133 includes an insulating structural layer C10 and a fiber composite material layer C20. At least part of the insulating structural layer C10 forms the wall surface of the side plate member 133 facing the receiving cavity 110. In other words, the insulating structural layer C10 serves as the inner wall of the side plate member 133 relative to the receiving cavity 110. The fiber composite material layer C20 forms the wall surface of the side plate member 133 away from the receiving cavity 110. In other words, the fiber composite material layer C20 serves as the outer wall of the side plate member 133 relative to the receiving cavity 110.

[0294] In some examples, a hollow cavity 131 is formed between the insulating structural layer C10 and the fiber composite material layer C20 of the side plate member 133. The hollow cavity 131 contains a first support 1322. At least a portion of the surface of the first support is covered with a connecting layer 1321, which is connected to the contacting insulating structural layer C10 and fiber composite material layer C20.

[0295] In some examples, the connecting layer 1321 is located between the first support 1322 and the insulating structure layer C10; in other examples, the connecting layer 1321 is located between the first support 1322 and the fiber composite material layer C20; in still other examples, the connecting layer 1321 is provided between the first support 1322 and the insulating structure layer C10, and between the first support 1322 and the fiber composite material layer C20.

[0296] In this embodiment, the beam member 134 is used to constrain the battery cell assembly 200 in the first direction X and at least to bear the expansion force of the battery cells 210. Specifically, the expansion force refers to the force exerted on the housing assembly 100 due to the expansion and deformation of the battery cells 210. As an example, the beam member 134 primarily bears the expansion force along the first direction X.

[0297] In this embodiment, the two beam members 134 may adopt the same or different structures. In some examples, the two beam members 134 adopt similar structures. The beam member 134 includes an insulating structural layer C10 and a fiber composite material layer C20. At least part of the insulating structural layer C10 forms the wall surface of the beam member 134 facing the receiving cavity 110. In other words, the insulating structural layer C10 serves as the inner wall of the beam member 134 relative to the receiving cavity 110. The fiber composite material layer C20 forms the wall surface of the beam member 134 away from the receiving cavity 110. In other words, the fiber composite material layer C20 serves as the outer wall of the beam member 134 relative to the receiving cavity 110.

[0298] In some examples, a hollow cavity 131 is formed between the insulating structural layer C10 and the fiber composite material layer C20 of the beam member 134, and a second support 1323 is placed inside the hollow cavity 131; in other examples, a third support 1324 is placed inside the hollow cavity 131; in still other examples, the hollow cavity 131 contains both the second support 1323 and the third support 1324, with the third support 1324 disposed on the side of the second support 1323 opposite to the receiving cavity 110.

[0299] The technical solution of this application embodiment includes two side plate components 133 and two beam components 134. The two side plate components 133 are disposed on both sides of the first wall 120 along the second direction Y, which can restrict the expansion force or deformation of the battery cell 210 along the second direction Y. The first support body 1322 can provide good support in the second direction Y. The two beam components 134 are disposed on both sides of the first wall 120 along the first direction X, which can restrict the expansion force or deformation of the battery cell 210 along the first direction X. The second support body 1323 can provide good support in the first direction X, so that the side plate components 133, beam components 134 and the first wall 120 cooperate to form a structurally stable and load-bearing capacity box assembly 100.

[0300] Reference Figure 5 , Figure 11 and Figure 12 In some embodiments, the support structure 132 is provided with a mounting structure 135.

[0301] In this embodiment, the mounting structure 135 fixes the battery device to an external component (e.g., an external support structure). In some embodiments, the mounting structure 135 may also connect other components of the battery device.

[0302] In this embodiment, the mounting structure 135 can be disposed at at least one of the first support 1322, the second support 1323, and the third support 1324. It is understood that, since the support structure 132 is disposed between the insulating structure layer C10 and the fiber composite material layer C20, the mounting structure 135 also includes the corresponding insulating structure layer C10 and fiber composite material layer C20.

[0303] In this embodiment of the application, the mounting structure 135 can be a snap-fit ​​structure, an adhesive structure, a welded structure, an overlapping structure, a threaded structure, etc. In some examples, the mounting mechanism is a threaded structure.

[0304] In this embodiment, the mounting structure 135 can be non-removable to improve connection stability. Alternatively, the mounting structure 135 can be detachable for easier maintenance. Furthermore, the mounting structure 135 can be configured to accommodate different types of external components to enhance the scalability of the battery device.

[0305] In this embodiment, the mounting structure 135 can be disposed at multiple locations on the box structure. The mounting structure 135 can be disposed on the side wall 130, or at the connection position of multiple side walls 130, or at the connection position of the side wall 130 and the first wall 120. In some examples, the box assembly 100 is approximately cuboid, and the box assembly 100 is provided with mounting structures 135 at each of the four corners corresponding to the first wall 120.

[0306] The technical solution of this application embodiment allows the mounting structure 135 to be effectively fixed to external components, thereby improving the connection stability of the battery device installed in other devices. Furthermore, the mounting structure 135 is disposed on the support structure 132, and relying on the structural strength of the support structure 132, it can provide stable support and is less likely to affect other components of the first wall 120 or side wall 130.

[0307] Reference Figure 11 , Figure 12 , Figure 13 and Figure 14 In some embodiments, a portion of the insulating structural layer C10 of the sidewall 130 is configured as a flange 141, which is connected to the fiber composite material layer C20 to form a connection structure 140.

[0308] In this embodiment, the connection structure 140 between the insulating structure layer C10 and the fiber composite material layer C20 of the sidewall 130 can be an adhesive structure, a snap-fit ​​structure, a welded structure, a riveting structure, a fastener connection structure 140, etc.

[0309] In this embodiment, a portion of the insulating structure layer C10 may be provided with a flange 141. The flange 141 is located at the edge of the insulating structure layer C10 and corresponds to the sidewall 130. It may be located on the outer or inner side of the sidewall 130 relative to the receiving cavity 110, or on the side of the sidewall 130 away from the first wall 120. In some examples, the flange 141 may also be formed of a fiber composite material layer C20.

[0310] In this embodiment, the flanged portion 141 can be formed by bending or flanging processes, and the bent portion of the flanged portion 141 can be an acute angle, a right angle, an obtuse angle, or a rounded corner.

[0311] In the technical solution of this application embodiment, the insulating structure layer C10 forming the inner wall of the receiving cavity 110 and the fiber composite material layer C20 forming the outer wall of the box assembly 100 are connected by a connecting structure 140. The connecting structure 140 includes a flange portion 141 formed by the insulating structure layer C10, which helps to form a stable connecting structure 140, improves the connection strength between the insulating structure layer C10 and the fiber composite material layer C20, and thus improves the structural stability of the box assembly 100.

[0312] Reference Figure 7 , Figure 10 and Figure 13 In some embodiments, the connecting structure 140 is located at the end of the side wall 130 on the side opposite to the first wall 120 along the thickness direction of the first wall 120, or the connecting structure 140 is located on the side of the side wall 130 on the side opposite to the receiving cavity 110 along the thickness direction of the side wall 130.

[0313] In some examples, the connection structure 140 is located at the end of the sidewall 130 that is opposite to the first wall 120 along the thickness direction (third direction Z). In other words, the connection structure 140 is located at the top of the sidewall 130, or the connection structure 140 is located at the opening of the housing assembly 100.

[0314] In other examples, the connecting structure 140 is located on the side of the sidewall 130 away from the receiving cavity 110 along the thickness direction of the sidewall 130 (first direction X or second direction Y). In other words, the connecting structure 140 is located on the side of the sidewall 130 opposite to the outer side of the receiving cavity 110.

[0315] In this embodiment, the connecting structures 140 in the side plate member 133 and the beam member 134 can be configured in the same or different forms. In some examples, the connecting structure 140 of the side plate member 133 is located on its top, and the connecting structure 140 of the beam member 134 is located on its outer side relative to the receiving cavity 110.

[0316] In the technical solution of this application embodiment, the connecting structure 140 is disposed on the top or outside of the side wall 130 so that the insulating structure layer C10 of the inner wall of the receiving cavity 110 extends to the outside of the housing assembly before being connected. This can avoid the internal space of the receiving cavity 110 so that the inner side of the receiving cavity 110 is completely covered by the insulating structure layer C10. This can reduce the impact of the connecting structure 140 on the internal structure of the receiving cavity 110 or the battery cell 210, and also make assembly easier.

[0317] Reference Figure 13 , Figure 16 and Figure 17 In some embodiments, in the connecting structure 140, the flange 141 overlaps with the fiber composite material layer C20, or the flange 141 is butt-joined with the fiber composite material layer C20.

[0318] In this embodiment of the application, overlapping refers to the fact that the projections of two components along a certain direction at least partially overlap, and the two are connected to each other. For example, in the connection structure 140, the projection of the flange 141 along the thickness direction at least partially overlaps with the projection of the fiber composite material layer C20 along that direction, and the flange 141 is connected to the fiber composite material layer C20 by means of bonding, welding, abutment, riveting, etc.

[0319] In some examples, one of the flange 141 and the fiber composite layer C20 is formed with a bent structure, which can be bent toward or away from the receiving cavity 110, and the other of the flange 141 and the fiber composite layer C20 overlaps with the bent structure.

[0320] Among them, the bending structure refers to the two connected parts of the component extending in different directions; for example, the flange 141 located on the outside of the beam component 134 has a bending structure, which bends toward the receiving cavity 110 and then bends toward the corresponding insulating structure layer C10; or, the fiber composite material layer C20 located on the outside of the beam component 134 bends away from the receiving cavity 110 and then bends toward the corresponding flange 141.

[0321] In this embodiment of the application, docking refers to two components being arranged opposite each other and connected to each other. For example, in the connection structure 140, along the extension direction of the flange 141, the flange 141 and the fiber composite material layer C20 are arranged opposite each other, that is, the projections of the two along the extension direction at least partially overlap, and the flange 141 and the fiber composite material layer C20 can be connected by abutment, bonding, welding or other means.

[0322] In this embodiment, the connection structure 140 of the side plate member 133 and the beam member 134 can adopt the same or different structural forms. In some examples, the connection structure 140 of the side plate member 133 and the beam member 134 both adopt the lap joint structure; in other examples, the connection structure 140 of the side plate member 133 is the lap joint structure, and the connection structure 140 of the beam member 134 is the butt joint structure.

[0323] In the technical solution of this application embodiment, the bent flange 141 and the fiber composite material layer C20 adopt an overlapping form, which has good sealing and connection performance, and can reduce the number of components and facilitate assembly; the flange 141 and the fiber composite material layer C20 adopt a butt joint structure with good flatness, and the structure of a single component is simpler.

[0324] Reference Figure 17 In some embodiments, the housing assembly 100 further includes an overlap layer 142, in which the flange portion 141 is mated with the fiber composite material layer C20, and the overlap layer 142 at least covers the mating seam between the flange portion 141 and the fiber composite material layer C20.

[0325] In this embodiment of the application, the flange 141 and the fiber composite material layer C20 are joined together to form a joint. The joint can be a closed line with the ends connected or a non-closed line. The joint can be a straight line, a curve, or a combination of both. In some examples, the joint is a straight line and is set parallel to the extension direction of the first wall 120 (first direction X or second direction Y).

[0326] In this embodiment, the overlap layer 142 may be connected to at least one of the insulating structural layer C10 and the fiber composite material layer C20. In some examples, the overlap layer 142 is connected to both the insulating structural layer C10 and the fiber composite material layer C20.

[0327] In this embodiment, the overlapping layer 142 may be located on the side of the flanged portion 141 / fiber composite material layer C20 away from the receiving cavity 110. For example, the overlapping layer 142 may be located on the outside of the sidewall 130 relative to the receiving cavity 110. Alternatively, the overlapping layer 142 may be located on the side of the flanged portion 141 / fiber composite material layer C20 close to the receiving cavity 110. For example, the overlapping layer 142 may be located in the hollow cavity 131.

[0328] The technical solution of this application embodiment, by setting an overlap layer 142, can cover the joint between the flange 141 and the fiber composite material layer C20, which can improve the sealing effect and also help to improve the connection strength between the insulation structure layer C10 and the fiber composite material layer C20.

[0329] In some embodiments, the outer side of the connecting structure 140 is flush with the outer side. Specifically, the extension surface of the outer surface of the flange 141 overlaps with the outer surface of the limiting composite material layer. In other words, when the outer surface of the flange 141 is in contact with a reference plane of a component, the outer surface of the composite material layer that is connected or overlapped with it is also in contact with the reference plane.

[0330] With this configuration, the outer side of the connecting structure 140 is flush, making the outer walls of the side plate component 133 and the beam component 134 smoother and easier to maintain; it also facilitates the alignment and assembly of the insulation structure layer C10 and the fiber composite material layer C20.

[0331] Reference Figure 18 and Figure 19 In some embodiments, the insulating structure layer C10 includes a first fiber fabric C11, the fiber composite material layer C20 includes a second fiber fabric C21, the first fiber fabric C11 includes multiple first fibers C111, the second fiber fabric C21 includes multiple second fibers C211, and the first fibers C111 are different from the second fibers C211.

[0332] In this embodiment, the fiber fabric can be a structure woven from multiple fibers, and the weaving can be plain weave, twill weave, satin weave, etc. Since the insulating structural layer C10 and the fiber composite material layer C20 also include a substrate for bonding and curing, in some examples, the multiple fibers in the fiber fabric can also be arranged in a non-intersecting form, such as multiple fibers arranged in parallel.

[0333] In this embodiment, the first fiber fabric C11 and the second fiber fabric C21 may employ the same or different weaving methods. The difference between the first fiber C111 and the second fiber C211 specifically refers to the different materials of the first fiber C111 and the second fiber C211, and is not a limitation on the structure of the first fiber C111 and the second fiber C211.

[0334] The technical solution of this application embodiment includes an insulating structure comprising a first fiber fabric C11 woven from multiple first fibers C111, and a fiber composite material layer C20 comprising a second fiber fabric C21 woven from multiple second fibers C211. The fiber fabric has high structural strength and load-bearing capacity, which helps to improve the load-bearing and protective capacity of the housing assembly 100.

[0335] In some embodiments, the density of the second fiber C211 is less than the density of the first fiber C111.

[0336] In some examples, the first fiber C111 includes glass fiber, basalt fiber, aramid fiber, etc., and the second fiber C211 includes carbon fiber and polyethylene fiber. The densities of the various fibers, from smallest to largest, are polyethylene fiber density < aramid fiber density < carbon fiber density < glass fiber density < basalt fiber density.

[0337] In some examples, the second fiber C211 is polyethylene fiber, and the first fiber C111 is one or more of glass fiber, basalt fiber, and aramid fiber.

[0338] In some examples, the second fiber C211 is carbon fiber, and the first fiber C111 is one or more of glass fiber and basalt fiber.

[0339] In some examples, the first fiber C111 is made of a high-density material, such as carbon fiber, which has good insulation properties. The second fiber C211 is made of a low-density material, such as polyethylene fiber, which facilitates the lightweighting of the housing assembly 100.

[0340] In some examples, the insulating structural layer C10 and the fiber composite layer C20 use the same substrate, and the first fiber C111 and the second fiber C211 use different sealing fibers; in other examples, the insulating structural layer C10 and the fiber composite layer C20 may also use substrates of different densities, for example, the density of the substrate in the insulating structural layer C10 is less than the density of the substrate in the composite layer, which helps to reduce the weight of the insulating structural layer C10.

[0341] In the technical solution of this application embodiment, the insulating structure layer C10 uses a material with a higher density, which helps to improve the insulation performance; the fiber composite material layer C20 uses a material with a lower density, which helps to reduce weight and facilitates the lightweight design of the battery device.

[0342] In some embodiments, the first fiber C111 includes at least one of glass fiber, basalt fiber, and aramid fiber; and / or, the second fiber C211 includes at least one of carbon fiber and polyethylene fiber.

[0343] In some examples, the first fiber C111 is glass fiber, and the second fiber C211 is carbon fiber. The fiber composite layer C20 made of glass fiber has advantages such as high strength, light weight, good insulation, and corrosion resistance; the insulating structural layer C10 made of carbon fiber has advantages such as high strength, low density, corrosion resistance, and good thermal stability.

[0344] In some examples, the first fiber C111 is glass fiber, and the second fiber C211 is polyethylene fiber. The fiber composite layer C20 made of glass fiber has advantages such as high strength, light weight, good insulation, and corrosion resistance; the insulating structural layer C10 made of polyethylene fiber has advantages such as high strength and toughness, low density, and ease of processing.

[0345] In some examples, the first fiber C111 is basalt fiber, and the second fiber C211 is carbon fiber. The fiber composite layer C20 made of basalt fiber has advantages such as good mechanical properties, good fire resistance and flame retardancy, strong insulation and electromagnetic shielding capabilities, and corrosion resistance; the insulating structural layer C10 made of carbon fiber has advantages such as high strength, low density, corrosion resistance, and good thermal stability.

[0346] In some examples, the first fiber C111 is basalt fiber, and the second fiber C211 is polyethylene fiber. The fiber composite layer C20 made of basalt fiber has advantages such as good mechanical properties, good fire resistance and flame retardancy, strong insulation and electromagnetic shielding capabilities, and corrosion resistance; the insulating structural layer C10 made of polyethylene fiber has advantages such as high strength and toughness, low density, and ease of processing.

[0347] In some examples, the first fiber C111 is aramid fiber, and the second fiber C211 is carbon fiber. The fiber composite layer C20 made of aramid fiber has advantages such as high strength, low density, impact resistance, good insulation, high temperature resistance, and easy processing; the insulating structural layer C10 made of carbon fiber has advantages such as high strength, low density, corrosion resistance, and good thermal stability.

[0348] In some examples, the first fiber C111 is aramid fiber, and the second fiber C211 is polyethylene fiber. The fiber composite layer C20 made of aramid fiber has advantages such as high strength, low density, impact resistance, good insulation, high temperature resistance, and easy processing; the insulating structural layer C10 made of polyethylene fiber has advantages such as high strength and toughness, low density, and easy processing.

[0349] In the technical solution of this application embodiment, the first fiber C111 and the second fiber C211 can be selected from suitable materials according to requirements, so as to be applied to a variety of different scenarios and improve the adaptability of the battery device.

[0350] In some embodiments, the first fiber C111 is glass fiber, and the second fiber C211 is carbon fiber. In the technical solution of this application embodiment, the first fiber C111 is glass fiber. The glass fiber prepreg has advantages such as excellent insulation performance, high structural strength, and lightweight, so that the glass fiber-containing insulation layer C10 has better insulation performance, higher structural strength, and higher elasticity, which can meet the impact resistance requirements and lightweight design of the enclosure assembly 100. The second fiber C211 is carbon fiber. The carbon fiber composite material layer C20 has advantages such as high strength, low density, corrosion resistance, and good thermal stability. It is lightweight and has good structural strength, which can meet the impact resistance requirements and lightweight design of the enclosure assembly 100.

[0351] In some embodiments, the number of layers of the first fiber fabric C11 in the insulating structure layer C10 is less than or equal to the number of layers of the second fiber fabric C21 in the fiber composite material layer C20.

[0352] In this embodiment, the number of layers of the first fiber fabric C11 at different positions of the housing assembly 100 corresponding to the insulating structural layer C10 may be the same or different, and the number of layers of the first fiber fabric C11 at different positions of the housing assembly 100 corresponding to the fiber composite material layer C20 may be the same or different. In some examples, the number of layers of the first fiber fabric C11 in the insulating structural layer C10 of the first wall 120 and the insulating structural layer C10 of the side wall 130 is the same, and the number of layers of the second fiber fabric C21 in the fiber composite material layer C20 of the first wall 120 and the fiber composite material layer C20 of the side wall 130 is the same, but the number of layers of the second fiber fabric C21 is greater than the number of layers of the first fiber fabric C11.

[0353] In some examples, the number of layers of the second fiber fabric C21 in the fiber composite layer C20 is equal to the number of layers of the first fiber fabric C11 in the insulating structure layer C10; in other examples, the number of layers of the first fiber fabric C11 in the insulating structure layer C10 is less than the number of layers of the second fiber fabric C21 in the fiber composite layer C20.

[0354] In the technical solution of this application embodiment, the insulation structure layer C10 has a smaller number of first fiber fabric C11 layers, which helps to reduce material consumption and reduce the wall thickness of the housing assembly 100; the fiber composite material layer C20 has a larger number of second fiber fabric C21 layers, which helps to improve structural strength.

[0355] In some embodiments, the number of layers of the first fiber fabric C11 in the insulating structure layer C10 is 1-3; and / or, the number of layers of the second fiber fabric C21 in the fiber composite material layer C20 is 2-15.

[0356] In this embodiment, the insulation structure layer C10 has a larger number of first fiber fabric C11 layers, which can provide better protective performance; the insulation structure layer C10 has a smaller number of first fiber fabric C11 layers, which helps to reduce the weight of the housing assembly 100.

[0357] In some examples, the insulating structure layer C10 includes one layer of first fiber fabric C11; in other examples, the insulating structure layer C10 includes two layers of first fiber fabric C11; in still other examples, the insulating structure layer C10 includes three layers of first fiber fabric C11; two or more layers of first fiber fabric C11 are joined together.

[0358] In this embodiment, the fiber composite layer C20 has a larger number of second fiber fabric C21 layers, which can provide better support performance; the fiber composite layer C20 has a smaller number of second fiber fabric C21 layers, which helps to reduce the weight of the housing assembly 100.

[0359] In some examples, the number of layers of the second fiber fabric C21 in the fiber composite layer C20 ranges from 2 to 15; for example, the second fiber fabric C21 has 2, 5, 7, 10, 13, or 15 layers, etc. The specific selection can be made according to the needs.

[0360] The technical solution of this application embodiment sets the number of layers of the first fiber fabric C11 in the first insulating layer within a suitable range. This allows for a significant reduction in the weight of the housing assembly 100 while ensuring good insulation performance of the insulating structural layer C10, facilitating the lightweight design of the housing assembly 100. Similarly, maintaining the number of layers of the second fiber fabric C21 in the fiber composite layer C20 within a suitable range allows for minimizing the total thickness and weight of the fiber composite layer C20 while maintaining its structural strength.

[0361] Reference Figure 18 and Figure 19 In some embodiments, the first fiber C111 is a continuous fiber, and at least some of the multiple first fibers C111 intersect each other; and / or, the second fiber C211 is a continuous fiber, and at least some of the multiple second fibers C211 intersect each other.

[0362] In this embodiment, the fiber is a connecting fiber, meaning that the fiber can extend to both opposite ends of the fiber fabric. Correspondingly, the first fiber C111 can extend to both opposite ends of the first fiber fabric C11; the second fiber C211 can extend to both opposite ends of the second fiber fabric C21.

[0363] In this embodiment of the application, the two fibers intersecting each other means that the two fibers extend in different directions (which can also be understood as the length direction of the fibers). The extension directions of the two fibers can be at right angle, acute angle or obtuse angle.

[0364] In this embodiment, at least some of the first fibers C111 intersect each other, as shown in the reference. Figure 18 It can be that in the same first fiber fabric C11, there are at least two intersecting first fibers C111, and the intersection of the two first fibers C111 can be a plain weave, twill weave, or satin weave, etc.; or, refer to Figure 19 In different first fiber fabrics C11, there are at least two intersecting first fibers C111.

[0365] In some examples, the insulating structure layer C10 includes one or more first fiber fabrics C11, each first fiber fabric C11 including at least two intersecting first fibers C111; in other examples, the insulating structure layer C10 includes two or more first fiber fabrics C11, multiple first fibers C111 in the same first fiber fabric C11 are arranged in parallel, and the first fibers C111 in at least two first fiber fabrics C11 are intersecting.

[0366] In this embodiment, at least some of the second fibers C211 intersect each other, as shown in the reference. Figure 18 It can be that in the same second fiber fabric C21, there are at least two intersecting second fibers C211, and the intersection of the two second fibers C211 can be a plain weave, twill weave, or satin weave, etc.; or, refer to Figure 19 In different second fiber fabrics C21, there are at least two intersecting second fibers C211.

[0367] In some examples, the fiber composite layer C20 includes one or more layers of second fiber fabric C21, each layer of second fiber fabric C21 including at least two intersecting second fibers C211; in other examples, the fiber composite layer C20 includes two or more layers of second fiber fabric C21, multiple second fibers C211 in the same second fiber fabric C21 are arranged in parallel, and the second fibers C211 in at least two second fiber fabrics C21 are intersecting.

[0368] In the technical solution of this application embodiment, the continuously arranged first fiber C111 and second fiber C211 have better structural integrity, so as to provide better structural strength for the insulating structural layer C10 or the fiber composite material layer C20. The cross-arranged first fiber C111 and second fiber C211 can improve the structural strength of the first fiber fabric C11 / second fiber C211 woven fabric, provide load-bearing capacity in multiple directions, and also reduce the possibility of the first fiber fabric C11 / second fiber C211 woven fabric being torn.

[0369] Reference Figure 18 and Figure 19 In some embodiments, the insulating structure layer C10 includes a first substrate C12 and a plurality of first fibers C111, wherein the first fibers C111 are continuous fibers and at least a portion of the plurality of first fibers C111 intersect each other; the first substrate C12 includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; the first fibers C111 include at least one of glass fiber, basalt fiber, and aramid fiber; and / or, the fiber composite material layer C20 includes a second substrate C22 and a plurality of second fibers C211, wherein the second fibers C211 are continuous fibers and at least a portion of the plurality of second fibers C211 intersect each other; the second substrate C22 includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; the second fibers C211 include at least one of carbon fiber and polyethylene fiber.

[0370] In this embodiment of the application, at least some of the first fibers C111 intersect each other. This can be because there are at least two intersecting first fibers C111 in the same first fiber fabric C11; or, there are at least two intersecting first fibers C111 in different first fiber fabrics C11.

[0371] In some examples, the insulating structure layer C10 includes one or more first fiber fabrics C11, each first fiber fabric C11 including at least two intersecting first fibers C111; in other examples, the insulating structure layer C10 includes two or more first fiber fabrics C11, multiple first fibers C111 in the same first fiber fabric C11 are arranged in parallel, and the first fibers C111 in at least two first fiber fabrics C11 are intersecting.

[0372] In some examples, the first substrate C12 is one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; in other examples, the first substrate C12 is composed of two or more of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0373] In some examples, the first fiber C111 is either carbon fiber or polyethylene fiber; in other examples, the first fiber C111 is a composite of carbon fiber and polyethylene fiber.

[0374] In some examples, the first substrate C12 includes polyurethane, and the first fiber C111 includes one or more of carbon fiber and polyethylene fiber. The first fiber fabric C11, which is composed of polyurethane and the first fiber C111, has advantages such as high elasticity, abrasion resistance and high tear strength.

[0375] In some examples, the first substrate C12 includes epoxy resin, and the first fiber C111 includes one or more of carbon fiber and polyethylene fiber. The first fiber fabric C11, which is composed of epoxy resin and first fiber C111, has advantages such as good adhesion, high mechanical strength and strong corrosion resistance.

[0376] In some examples, the first substrate C12 includes phenolic resin, and the first fiber C111 includes one or more of carbon fiber and polyethylene fiber. The first fiber fabric C11, which is composed of phenolic resin and first fiber C111, has advantages such as good heat resistance and good flame retardancy.

[0377] In some examples, the first substrate C12 includes polyamide resin, and the first fiber C111 includes one or more of carbon fiber and polyethylene fiber. The first fiber fabric C11, which is composed of polyamide resin and first fiber C111, has advantages such as high strength, good wear resistance, and good oil resistance.

[0378] In some examples, the first substrate C12 includes a ceramizable resin, and the first fiber C111 includes one or more of carbon fiber and polyethylene fiber. The first fiber fabric C11, which is composed of the ceramizable resin and the first fiber C111, has advantages such as good structural stability, high temperature resistance, and good flame retardancy.

[0379] In some examples, the first fiber C111 includes carbon fiber, and the first substrate C12 includes polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin. The first fiber fabric C11, which is composed of carbon fiber and the first substrate C12, has advantages such as high strength, low density, corrosion resistance, and good thermal stability.

[0380] In some examples, the first fiber C111 includes polyethylene fiber, and the first substrate C12 includes polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin. The first fiber fabric C11, which is composed of polyethylene fiber and the first substrate C12, has advantages such as high strength and toughness, low density, and ease of processing.

[0381] In this embodiment of the application, at least some of the second fibers C211 intersect each other. This can be because there are at least two intersecting second fibers C211 in the same second fiber fabric C21, or at least two intersecting second fibers C211 in different second fiber fabrics C21.

[0382] In some examples, the fiber composite layer C20 includes one or more layers of second fiber fabric C21, each layer of second fiber fabric C21 including at least two intersecting second fibers C211; in other examples, the fiber composite layer C20 includes two or more layers of second fiber fabric C21, multiple second fibers C211 in the same second fiber fabric C21 are arranged in parallel, and the second fibers C211 in at least two second fiber fabrics C21 are intersecting.

[0383] In some examples, the second substrate C22 is one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; in other examples, the second substrate C22 is composed of two or more of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0384] In some examples, the second fiber C211 is one of glass fiber, basalt fiber, and aramid fiber; in other examples, the second fiber C211 is composed of two or more of glass fiber, basalt fiber, and aramid fiber.

[0385] In some examples, the second substrate C22 includes polyurethane, and the second fiber C211 includes one or more of glass fiber, basalt fiber, and aramid fiber. The second fiber C211 prepreg composed of polyurethane and the second fiber C211 has advantages such as high elasticity, abrasion resistance and high tear strength.

[0386] In some examples, the second substrate C22 includes epoxy resin, and the second fiber C211 includes one or more of glass fiber, basalt fiber, and aramid fiber. The second fiber C211 prepreg composed of epoxy resin and second fiber C211 has advantages such as good adhesion, high mechanical strength, and strong corrosion resistance.

[0387] In some examples, the second substrate C22 includes phenolic resin, and the second fiber C211 includes one or more of glass fiber, basalt fiber, and aramid fiber. The second fiber C211 prepreg composed of phenolic resin and second fiber C211 has advantages such as good heat resistance and good flame retardancy.

[0388] In some examples, the second substrate C22 includes polyamide resin, and the second fiber C211 includes one or more of glass fiber, basalt fiber, and aramid fiber. The second fiber C211 prepreg composed of polyamide resin and second fiber C211 has advantages such as high strength, good wear resistance, and good oil resistance.

[0389] In some examples, the second substrate C22 includes a ceramizable resin, and the second fiber C211 includes one or more of glass fiber, basalt fiber, and aramid fiber. The second fiber C211 prepreg, which is composed of the ceramizable resin and the second fiber C211, has advantages such as good structural stability, high temperature resistance, and good flame retardancy.

[0390] In some examples, the second fiber C211 includes glass fiber, and the second substrate C22 includes polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin. The second fiber C211 prepreg, which is composed of glass fiber and the second substrate C22, has advantages such as high strength, light weight, good insulation, and corrosion resistance.

[0391] In some examples, the second fiber C211 includes basalt fiber, and the second substrate C22 includes polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin. The second fiber C211 prepreg, which is composed of basalt fiber and second substrate C22, has advantages such as good mechanical properties, good fire resistance and flame retardancy, strong insulation and electromagnetic shielding capabilities, and corrosion resistance.

[0392] In some examples, the second fiber C211 includes aramid fiber, and the second substrate C22 includes polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin. The second fiber C211 prepreg composed of aramid fiber and second substrate C22 has advantages such as high strength, low density, impact resistance, good insulation, high temperature resistance, and easy processing.

[0393] The technical solutions of this application embodiment use polyurethane, epoxy resin, phenolic resin, polyamide resin, ceramicizable resin, etc. as the first substrate C12, which has good wear resistance, high toughness, adhesion, corrosion resistance, and heat resistance. Using carbon fiber, polyethylene fiber, etc. as the second fiber C211 can reduce weight and provide higher strength. Using polyurethane, epoxy resin, phenolic resin, polyamide resin, ceramicizable resin, etc. as the second substrate C22, which has good wear resistance, high toughness, adhesion, corrosion resistance, and heat resistance, and using glass fiber, basalt fiber, aramid fiber, etc. as the first fiber C111, can obtain good structural strength and insulation properties.

[0394] In the technical solution of this application embodiment, the insulating structural layer C10 includes a first substrate C12 and a first fiber C111, and the fiber composite material layer C20 includes a second substrate C22 and a second fiber C211. The insulating structural layer C10 made of the first fiber C111 has good insulation performance; the fiber composite material layer C20 made of the second fiber C211 has the advantages of high support strength and lightweight. The combination of the two can facilitate the enclosure assembly 100 to have both lightweight and protective performance.

[0395] Reference Figure 20 In some embodiments, the thickness H1 of the insulating structural layer C10 is less than or equal to the thickness H2 of the fiber composite layer C20; and / or, the thickness H1 of the insulating structural layer C10 is in the range of 0.1 mm to 1.0 mm, and the thickness H2 of the fiber composite layer C20 is in the range of 1.0 mm to 2.5 mm.

[0396] In this embodiment, the thickness H1 of the insulating structure layer C10 is its dimension along its own thickness direction. The thickness directions of the insulating structure layers C10 at different locations on the housing assembly 100 can be the same or different. For example, the thickness H1 of the insulating structure layer C10 disposed on the first wall 120 is its dimension along the thickness direction of the first wall 120 (third direction Z); the thickness H1 of the insulating structure layer C10 disposed on the inner or outer side of the side wall 130 is its dimension along the thickness direction of the side wall 130 (first direction X or second direction Y).

[0397] In this embodiment, the insulation layer C10 has a larger thickness H1, which can provide better protection performance; the insulation layer C10 has a smaller thickness H1, which helps to reduce the weight of the housing assembly 100.

[0398] In some examples, the thickness H1 of the insulating structure layer C10 ranges from 0.1 mm to 1.0 mm. For example, the thickness H1 of the insulating structure layer C10 is 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 1.0 mm, etc.

[0399] In this embodiment, the thickness H2 of the fiber composite material layer C20 is its dimension along its own thickness direction. The thickness directions of the fiber composite material layers C20 at different positions of the housing assembly 100 can be the same or different. For example, the thickness H2 of the fiber composite material layer C20 provided on the first wall 120 is the dimension along the thickness direction of the first wall 120 (third direction Z); the thickness H2 of the fiber composite material layer C20 provided on the inner or outer side of the side wall 130 is the dimension in the thickness direction of the side wall 130 (first direction X or second direction Y).

[0400] In this embodiment, the fiber composite material layer C20 has a larger thickness H2, which can provide better support performance and resistance to deformation; the fiber composite material layer C20 has a smaller thickness H2, which helps to reduce the weight of the housing assembly 100.

[0401] In some examples, the thickness H2 of the fiber composite layer C20 ranges from 1.0 mm to 2.5 mm. For example, the thickness H2 of the fiber composite layer C20 is 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, etc.

[0402] In some examples, the thickness H1 of the insulating structural layer C10 is less than the thickness H2 of the fiber composite layer C20, for example, the thickness H1 of the insulating structural layer C10 is 0.5 mm and the thickness H2 of the fiber composite layer C20 is 1.0 mm; in other examples, the thickness H1 of the insulating structural layer C10 is equal to the thickness H2 of the fiber composite layer C20, for example, the thickness H1 of the insulating structural layer C10 and the thickness H2 of the fiber composite layer C20 are both 1.0 mm.

[0403] In the technical solution of this application embodiment, the thinner insulating structural layer C10 helps to reduce the wall thickness of the housing assembly 100 and reduce the weight of the housing assembly 100 while meeting the insulation requirements; the thicker fiber composite material layer C20 helps to improve the structural strength so as to provide a more stable working environment for the battery cell 210.

[0404] Reference Figure 9 In some embodiments, the first wall 120 further includes a reinforcing layer 122, which is stacked between the insulating structural layer C10 and the fiber composite material layer C20. The reinforcing layer 122 includes a fiber-reinforced composite material layer, which includes a third substrate and a third fiber. The third substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; the third fiber includes at least one of carbon fiber and polyethylene fiber.

[0405] In this embodiment, the reinforcing layer 122 can be bonded to the insulating structural layer C10 and the fiber composite material layer C20. This bonding can be partial or full-surface bonding. In some examples, the reinforcing layer 122 is bonded to one of the insulating structural layer C10 and the fiber composite material layer C20, while the other is spaced apart. For example, a cavity is provided between the insulating structural layer C10 and the fiber composite material layer C20 of the first wall 120, and the reinforcing layer 122 is disposed in the cavity. This reinforcing layer 122 is bonded to the insulating structural layer C10 and spaced apart from the fiber composite material layer C20.

[0406] In some examples, the reinforcing layer 122 may also be disposed between the insulating structural layer C10 and the fiber composite material layer C20 of the sidewall 130 and the cover 500, for example, the reinforcing layer 122 may be disposed in the beam member 134 or the side plate member 133.

[0407] In some examples, the reinforcing layer 122 is made of the same material as the insulating structural layer C10; in other examples, the reinforcing layer 122 is made of the same material as the fiber composite layer C20; and in still other examples, the reinforcing layer 122 is made of different materials from both the insulating structural layer C10 and the fiber composite layer C20. For example, the reinforcing layer 122 is formed by stacking one or more layers of fiber-reinforced composite material.

[0408] In some examples, the fiber-reinforced composite layer includes a third substrate and a third fiber.

[0409] In one example, the third substrate is one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; in other examples, the third substrate is composed of two or more of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0410] In some examples, the third fiber is either carbon fiber or polyethylene fiber; in other examples, the third fiber is a composite of carbon fiber and polyethylene fiber.

[0411] In some examples, the third substrate includes polyurethane, and the third fiber includes one or more of carbon fiber and polyethylene fiber. The third fiber fabric composed of polyurethane and the third fiber has advantages such as high elasticity, abrasion resistance and high tear strength.

[0412] In some examples, the third substrate includes epoxy resin, and the third fiber includes one or more of carbon fiber and polyethylene fiber. The third fiber fabric composed of epoxy resin and third fiber has advantages such as good adhesion, high mechanical strength and strong corrosion resistance.

[0413] In some examples, the third substrate includes phenolic resin, and the third fiber includes one or more of carbon fiber and polyethylene fiber. The third fiber fabric composed of phenolic resin and third fiber has advantages such as good heat resistance and good flame retardancy.

[0414] In some examples, the third substrate includes polyamide resin, and the third fiber includes one or more of carbon fiber and polyethylene fiber. The third fiber fabric composed of polyamide resin and third fiber has advantages such as high strength, good abrasion resistance, and good oil resistance.

[0415] In some examples, the third substrate includes a ceramizable resin, and the third fiber includes one or more of carbon fiber and polyethylene fiber. The third fiber fabric composed of the ceramizable resin and the third fiber has advantages such as good structural stability, high temperature resistance, and good flame retardancy.

[0416] In some examples, the third fiber includes carbon fiber, and the third substrate includes polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin. The third fiber fabric composed of carbon fiber and the third substrate has advantages such as high strength, low density, corrosion resistance, and good thermal stability.

[0417] In some examples, the third fiber includes polyethylene fiber, and the third substrate includes polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin. The third fiber fabric composed of polyethylene fiber and the third substrate has advantages such as high strength and toughness, low density, and ease of processing.

[0418] The technical solutions of this application embodiment use polyurethane, epoxy resin, phenolic resin, polyamide resin, ceramicizable resin, etc. as the third substrate, which have good wear resistance, high toughness, adhesion, corrosion resistance, heat resistance and other properties. Using carbon fiber, polyethylene fiber, etc. as the third fiber can reduce weight and provide higher strength.

[0419] In some examples, the first substrate C12, the second substrate C22, and the third substrate are all the same, the first fiber C111 and the second fiber C211 are different, and the second fiber C211 and the third fiber are the same. In other examples, the first fiber C111 and the second fiber C211 are different, and the first fiber C111 and the third fiber are the same.

[0420] In some examples, the first fiber C111 is at least one of glass fiber, basalt fiber, and aramid fiber; the third fiber is at least one of carbon fiber and polyethylene fiber. For example, the insulating structural layer C10 is composed of glass fiber composite, and the reinforcing layer 122 is composed of carbon fiber composite. The third fiber fabric made of carbon fiber has advantages such as high strength, low density, corrosion resistance, and good thermal stability, so that the reinforcing layer 122 containing carbon fiber is lighter and has better supporting strength, which can meet the impact resistance requirements and lightweight design of the housing assembly 100.

[0421] The technical solution of this application embodiment provides a reinforcing layer 122, which includes a fiber-reinforced composite material layer. The fiber-reinforced composite material layer includes a third substrate and a third fiber. The fiber-reinforced composite material layer has good insulation performance or structural strength, which helps to improve the protection and support capabilities of the first wall 120 and meet more stringent requirements.

[0422] Reference Figure 20In some embodiments, the thickness H3 of the first wall 120 is in the range of 1.3 mm to 2.4 mm.

[0423] In this embodiment, the thickness H3 of the first wall 120 is relatively large, which can provide better protection and support; the thickness H3 of the first wall 120 is relatively small, which helps to reduce the weight of the housing assembly 100.

[0424] In some examples, the thickness H3 of the first wall 120 can range from 1.3mm-2.3mm, 1.3mm-2.2mm, 1.5mm-2.4mm, 2.0mm-2.4mm, or 1.9mm-2.3mm, etc. The specific thickness can be selected according to the required specifications.

[0425] In some examples, the thickness H3 of the first wall 120 can be 1.3mm, 1.4mm, 1.5mm, 1.6mm, 2.0mm, or 2.4mm, etc. The specific thickness can be selected according to the requirements.

[0426] The technical solution of this application embodiment reduces the weight of the first wall 120 by keeping the thickness H3 of the first wall 120 within a suitable range, thereby improving the structural strength and insulation performance of the first wall 120 and facilitating the lightweighting of the battery device.

[0427] Reference Figure 14 and Figure 21 In some embodiments, the battery cell 210 has a pressure relief portion 211, and the battery cell 210 is arranged such that the pressure relief port of the pressure relief portion 211 faces the first wall 120. The first wall 120 has a through hole 121 that penetrates the first wall 120 and is projected on the same projection plane along the thickness direction of the first wall 120. The projection of the pressure relief port is located within the projection of the through hole 121.

[0428] In this embodiment, the pressure relief section 211 is used to release internal gas when the internal pressure of the battery cell 210 rises abnormally (such as in the case of overcharging, overheating or short circuit), so as to prevent the battery from exploding or catching fire.

[0429] In some examples, the pressure relief section 211 includes a safety valve. If the gas pressure inside the battery cell 210 exceeds the pressure threshold of the safety valve, it can be released through the safety valve. That is, the gas inside the battery cell 210 flows out through the pressure relief port, thereby reducing the pressure inside the battery cell 210.

[0430] In this embodiment of the application, the first wall 120 has a through hole 121 formed at the pressure relief port of the pressure relief part 211. The through hole 121 can correspond to a single battery cell 210 or multiple battery cells 210 in the battery cell group 200.

[0431] In this embodiment of the application, the projection of the pressure relief port is located within the projection of the through hole 121 along the thickness direction (third direction Z) of the first wall 120. In other words, the projection of the through hole 121 completely covers the projection of the pressure relief port.

[0432] In the technical solution of this application embodiment, since the projection of the through hole 121 completely covers the projection of the pressure relief port, the pressure relief airflow ejected from the pressure relief port passes through the through hole 121 and passes through the first wall 120, making it less likely to impact the first wall 120 or its structure, so as to protect the housing assembly 100 and other battery cells 210 therein.

[0433] Reference Figure 14 , Figure 21 and Figure 24 In some embodiments, the battery device further includes a protective film 150, which is disposed on the first wall 120 and covers the through hole 121.

[0434] In this embodiment, the protective film 150 is used to cover the through hole 121. In other words, when projected along the third direction Z, the projection of the protective film 150 covers the projection of the corresponding through hole 121. The protective film 150 can isolate the space of the receiving cavity 110 relative to the outside of the first wall 120 so that the receiving cavity 110 is relatively sealed.

[0435] In this embodiment, the protective film 150 is configured to be ruptured by the pressure relief airflow. That is, when the pressure relief section 211 of the battery cell 210 is ejected, the pressure relief airflow ruptures the protective film 150 through the high-pressure airflow so that it can flow through the through hole 121 to the side of the first wall 120 away from the receiving cavity 110.

[0436] In this embodiment, the protective film 150 can be made of an insulating and easily ruptured material, such as polyethylene terephthalate.

[0437] In this embodiment, the protective film 150 can be connected to the insulating structural layer C10 or to the fiber composite material layer C20. In some examples, the protective film 150 is disposed on the side of the insulating structural layer C10 away from the fiber composite material layer C20, and the protective film 150 is connected to the insulating structural layer C10 by means of bonding, welding, overlapping, etc.

[0438] The technical solution of this application embodiment, by setting a protective film 150, can not only maintain the relative sealing of the receiving cavity 110, but also break through the explosion-proof film when the pressure relief part 211 ejects pressure relief airflow, so that the pressure relief airflow can enter the through hole 121, thereby improving the safety performance of the battery device.

[0439] Reference Figure 22 , Figure 23 and Figure 25In some embodiments, the battery device further includes a protective plate 310, which is disposed on the side of the first wall 120 opposite to the receiving cavity 110. A pressure relief cavity 320 is formed between the protective plate 310 and the first wall 120, and the pressure relief cavity 320 communicates with the through hole 121.

[0440] In this embodiment, the protective component 300 includes a protective plate 310, which is connected to the housing component 100 and together with the housing component 100 forms a pressure relief cavity 320. In some examples, the pressure relief cavity 320 is formed by the protective plate 310 and the first wall 120, and the pressure relief cavity 320 is connected to the through hole 121.

[0441] In this embodiment, the pressure relief chamber 320 can be connected to the outside to discharge the pressure relief airflow to the outside, or the pressure relief chamber 320 can be relatively closed to the outside, with the protective plate 310 bearing the impact. Alternatively, when it is necessary to release the pressure relief airflow, the pressure relief chamber 320 can be connected to the external environment.

[0442] In this embodiment, the connection between the protective plate 310 and the housing assembly 100 can be by snap-fitting, welding, bonding, threaded connection, fastener connection, etc. In some examples, the protective plate 310 includes a main structure 313 and a flange structure 314. The main structure 313 is disposed opposite to the first wall 120, and the flange structure 314 surrounds the edge of the main structure 313. The flange structure 314 is connected to the first wall 120 and / or the side wall 130.

[0443] The technical solution of this application embodiment provides support and protection for the housing assembly 100 by setting a protective plate 310. A pressure relief chamber 320 is formed between the protective plate 310 and the first wall 120. The pressure relief airflow ejected from the pressure relief port enters the pressure relief chamber 320 through the through hole 121. Since the pressure relief chamber 320 has a large space, it can effectively buffer the impact, reduce the risk of thermal runaway of the battery device, and improve the safety performance of the battery device.

[0444] Reference Figure 22 , Figure 23 and Figure 26 In some embodiments, the pressure relief chamber 320 is selectively connected to the external environment.

[0445] In this embodiment of the application, the selective connection between the pressure relief chamber 320 and the external environment means that the pressure relief chamber 320 is isolated from the external environment under normal circumstances, but when the pressure relief section 211 ejects pressure relief airflow, the pressure relief chamber 320 is connected to the external environment, thereby releasing the pressure relief airflow.

[0446] In some examples, the opening of the pressure relief chamber 320 that connects to the external environment is provided with a perforable membrane structure, which can be similar to the protective membrane 150 of the first wall 120. In other examples, the opening of the pressure relief chamber 320 that connects to the external environment is provided with a valve. When the preset opening conditions of the valve are met, the pressure relief chamber 320 connects to the external environment through the valve. The preset opening conditions can be set based on the air pressure and temperature inside the pressure relief chamber 320.

[0447] In the technical solution of this application embodiment, the pressure relief chamber 320 is selectively connected to the external environment, which can keep the internal environment such as the pressure relief chamber 320 and the housing assembly 100 isolated from the outside world, and can also release the pressure relief airflow in a timely manner when needed, thereby improving the safety of the battery device.

[0448] Reference Figure 26 In some embodiments, an exhaust flow path 321 is formed in the pressure relief chamber 320, and the housing assembly 100 also includes a pressure relief valve 330. The exhaust flow path 321 is connected to the pressure relief valve 330. The pressure relief valve 330 is configured to open under the action of gas pressure in the exhaust flow path 321. When the pressure relief valve 330 is open, the exhaust flow path 321 is connected to the external environment.

[0449] In this embodiment, the exhaust flow path 321 can be a straight line, a curved line, a spiral line, a branch line, or other structural forms. The exhaust flow path 321 can be formed by a pipe connecting to the through hole 121, or it can be formed by partitions, protrusions, or other structures within the pressure relief chamber 320 that separate the pressure relief chamber 320.

[0450] In some examples, the protective plate 310 includes a protruding structure 315 that protrudes toward the first wall 120 and seals against the first wall 120, thereby dividing the pressure relief chamber 320 into multiple exhaust flow paths 321. Different exhaust flow paths 321 can correspond to different battery cell groups 200, thereby reducing the mutual influence between battery cell groups 200.

[0451] In this embodiment, the protective plate 310 may have an air outlet, which is connected to the pressure relief chamber 320 or the through hole 121 through the exhaust flow path 321. The pressure relief valve 330 is located at the air outlet, or the pressure relief valve 330 is located in the exhaust flow path 321.

[0452] In this embodiment, the pressure relief valve 330 can be mechanical, electrically controlled, magnetically controlled, etc. The pressure relief valve 330 has a preset pressure threshold. When the pressure in the pressure relief flow path increases, for example, when there is pressure relief gas flow discharged from the pressure relief section 211, the pressure in the pressure relief flow path exceeds the pressure threshold. The pressure relief valve 330 then opens, connecting the exhaust flow path 321 to the external environment and discharging the pressure relief gas flow. Conversely, when the pressure in the pressure relief flow path is lower than the pressure threshold, the pressure relief valve 330 closes, isolating the exhaust flow path 321 from the external environment.

[0453] The technical solution of this application embodiment provides a pressure relief valve 330 in the exhaust flow path 321. The pressure relief valve 330 can open in time under pressure to discharge the pressure relief airflow. It can also isolate the exhaust flow path 321 from the external environment when the pressure is low. It can be adjusted independently to meet different usage requirements.

[0454] Reference Figure 27 In some embodiments, the battery device further includes a heat-absorbing component 400, which is disposed in the pressure relief chamber 320 and is disposed opposite to the pressure relief portion 211 of the battery cell 210.

[0455] In this embodiment, the heat-absorbing component 400 refers to a component capable of absorbing heat to lower the ambient temperature, thereby enabling the battery cell 210 to operate within a suitable temperature range. The heat-absorbing component 400 also effectively reduces the impact of high-temperature, high-pressure venting gas on other components. The heat-absorbing component 400 can be a phase change heat-absorbing structure, a heat pipe heat-absorbing structure, a liquid-cooled plate structure, a thermoelectric heat-absorbing structure, etc.

[0456] In this embodiment, the heat absorption component 400 is located in the pressure relief chamber 320, that is, the heat absorption component 400 is disposed between the first wall 120 and the protective plate 310. The heat absorption component 400 can be connected to the first wall 120, the protective plate 310 or other structures of the housing assembly 100.

[0457] In this embodiment, the heat-absorbing component 400 and the pressure relief portion 211 of the battery cell 210 are opposite each other, meaning that the heat-absorbing component 400 and the corresponding pressure relief portion 211 are arranged sequentially along a certain direction, and the airflow between them can also flow along that direction. That is, the pressure relief airflow released by the pressure relief portion 211 can flow to the heat-absorbing component 400 along that direction. The relative direction between the heat-absorbing component 400 and the battery cell 210 can be arranged at an angle to the first wall 120, for example, the relative direction between the heat-absorbing component 400 and the battery cell 210 is the third direction Z.

[0458] In some examples, the heat-absorbing component 400 is configured for a single battery cell 210, while in other examples, the heat-absorbing component 400 is configured for multiple battery cells 210 in a battery cell group 200, meaning that the heat released by multiple battery cells 210 can be absorbed by a single heat-absorbing component 400.

[0459] The technical solution of this application embodiment, by setting a heat-absorbing component 400, which is arranged relative to the pressure relief part 211, allows the pressure relief gas generated by the pressure relief part 211 to be effectively conducted to the heat-absorbing component 400. On the one hand, the heat-absorbing component 400 can absorb heat, thereby reducing the risk of the battery cell 210 running out of control due to high temperature. On the other hand, the heat-absorbing component 400 can also block the impact of the pressure relief gas, reduce the adverse effects of the pressure relief gas on other components, and improve the safety performance of the battery device.

[0460] Reference Figure 27 In some embodiments, the heat-absorbing component 400 includes at least a phase change layer 410 made of a phase change material, the first phase change temperature of which is in the range of 90°C to 150°C.

[0461] In this embodiment of the application, the phase change material is a material that can absorb or release heat through a change in physical state (such as from solid to liquid, or from liquid to gas) within a specific temperature range.

[0462] In this embodiment, the phase change material is at least one of deionized water, hydrated inorganic gel, and hydrated organic gel. In some examples, the phase change material is stored within the pores of an adsorbent material. The adsorbent material is at least one of acrylic foam, melamine foam, polyurethane foam, and silicone foam.

[0463] In this embodiment, the first phase change temperature of the phase change material is the temperature at which the phase change material undergoes a physical transformation and absorbs heat. A higher first phase change temperature results in better heat absorption capacity, making it easier to absorb more heat. A lower first phase change temperature helps to maintain the battery cell 210 at a more suitable temperature.

[0464] In some examples, the first phase transition temperature ranges from 90°C to 150°C. For example, the first phase transition temperature is 90°C, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, etc.

[0465] In this embodiment, the phase change material may also have a second phase change temperature, which is the temperature at which the phase change material undergoes a physical transformation and releases heat. In a low-temperature environment, the heat released by the phase change material can maintain the battery cell 210 at a suitable temperature, reducing the possibility of the battery cell 210 failing due to low temperature.

[0466] In some examples, the second phase transition temperature ranges from -40°C to 0°C. For example, the second phase transition temperatures are -40°C, -30°C, -20°C, -10°C, 0°C, etc.

[0467] In some examples, the heat-absorbing component 400 also includes heat-resistant materials such as mica, silicone, glass fiber, and graphite disposed in the phase change layer to improve the heat resistance and impact resistance of the heat-absorbing component 400.

[0468] The technical solution of this application embodiment, by setting a phase change layer 410, the phase change material of the phase change layer 410 can absorb or release heat, and the phase change temperature of the phase change layer 410 is set within a suitable range. The phase change layer 410 absorbs heat to reduce the possibility of thermal runaway of the battery cell 210, and releases heat to reduce the possibility of low-temperature failure of the battery cell 210, so as to provide a suitable temperature environment for the battery cell 210. In addition, the heat-absorbing component 400 containing the phase change layer 410 can also effectively block the impact of the depressurized gas on other components by absorbing the heat of the depressurized gas.

[0469] Reference Figure 27 In some embodiments, the heat absorption assembly 400 further includes a heat-conducting layer 420, which is stacked with the phase change layer 410. Along the stacking direction, the heat-conducting layer 420 is located at least on the side of the phase change layer 410 near the pressure relief portion 211.

[0470] In this embodiment, the thermally conductive layer 420 is used for rapid and even heat conduction, thereby improving the heat transfer efficiency between the pressure relief section 211 and the phase change layer 410. The material of the thermally conductive layer 420 can be one or more combinations of titanium, steel, copper, silver, ceramics, and graphene.

[0471] In this embodiment, the stacking direction of the thermal conductive layer 420 and the phase change layer 410 may be at an angle to the extension direction of the first wall 120. For example, the thermal conductive layer 420 and the phase change layer 410 are stacked along the third direction Z.

[0472] In this embodiment, the thermal conductive layer 420 can be disposed on the side of the phase change layer 410 close to the pressure relief part 211, or on the side of the phase change layer 410 away from the pressure relief part 211, or the thermal conductive layer 420 can be stacked on both sides of the phase change layer 410.

[0473] The technical solution of this application embodiment, by setting a heat-conducting layer 420, can improve the heat transfer efficiency between the pressure relief part 211 and the phase change layer 410, improve the temperature regulation capability of the heat absorption component 400, and thus improve the safety performance of the battery device.

[0474] Reference Figure 28 , Figure 29 and Figure 30In some embodiments, the battery device further includes a protective component 300, which is disposed on the side of the first wall 120 away from the receiving cavity 110. A cooling chamber 350 is formed between the protective component 300 and the first wall 120. The protective component 300 is provided with a first air outlet 311 and a second air outlet 312 communicating with the cooling chamber 350.

[0475] In this embodiment, a cooling chamber 350 is formed between the protective component 300 and the first wall 120. A heat exchange medium can flow in the cooling chamber 350. The heat exchange medium flows through the first wall 120 and exchanges heat with the first wall 120, thereby realizing the heat exchange between the battery cell 210 inside the housing component 100 and the outside world, so as to cool or heat the battery cell 210.

[0476] In this embodiment, the heat exchange medium can flow into the air-cooled chamber 350 through the first air vent 311, exchange heat with the first wall 120 in the air-cooled chamber 350, and the heat exchange medium after heat exchange flows out of the air-cooled chamber 350 through the second air vent 312.

[0477] In this embodiment, the heat exchange medium can be a gaseous medium or a liquid medium. For example, the first air vent 311 / second air vent 312 of the protective component 300 is connected to an air conditioning system, a liquid cooling system, a fan device, etc.

[0478] In some examples, the first air vent 311 / second air vent 312 can also be directly connected to the outside of the electrical equipment. For example, the electrical equipment is an aircraft, and the heat exchange medium is the airflow generated during the aircraft's flight. The airflow generated during the aircraft's flight is used to cool the battery cell 210. The airflow has a high velocity, which facilitates the cooling of the battery cell 210 and simplifies the heat exchange structure, contributing to the lightweight design of the aircraft.

[0479] In this embodiment, the first air vent 311 and the second air vent 312 may have the same or different structures; the first air vent 311 and the second air vent 312 may have the same or different sizes; the number of the first air vent 311 and the second air vent 312 may be the same or different. In some examples, the first air vent 311 and the second air vent 312 are provided in a one-to-one correspondence.

[0480] The first air vent 311 and the second air vent 312 can be arranged in various ways. In some examples, the first air vent 311 and the second air vent 312 are respectively located on different sides of the protective assembly 300. For example, the first air vent 311 and the second air vent 312 are arranged on opposite sides of the protective assembly 300 along a first direction X or a second direction Y.

[0481] In other examples, one of the first air vent 311 and the second air vent 312 is located in the middle of the protective component 300, and the other of the first air vent 311 and the second air vent 312 is located at the edge of the protective component 300. For example, a plurality of first air vents 311 are arrayed in the middle of the protective component 300, and a plurality of second air vents 312 are arranged around the edge of the protective component 300.

[0482] The technical solution of this application embodiment provides an air-cooled chamber 350. The heat exchange medium flowing in the air-cooled chamber 350 can enter the air-cooled chamber 350 through the first air outlet 311 and flow out of the air-cooled chamber 350 through the second air outlet 312. The heat exchange medium in the air-cooled chamber 350 exchanges heat with the first wall 120, thereby realizing the heat exchange between the battery cell 210 in the housing assembly 100 and the outside world, so as to maintain the battery cell 210 at a suitable temperature.

[0483] Reference Figure 25 , Figure 31 and Figure 32 In some embodiments, the protective component 300 includes a protective plate 310 and a flow collector 340. The protective plate 310 is provided with a first air outlet 311 and a second air outlet 312. The flow collector 340 is disposed between the protective plate 310 and the first wall 120, and forms a flow collection cavity 360 between the protective plate 310 and the protective plate 310. The flow collector 340 is provided with a sub-flow outlet 341, which is connected to the ventilation and cooling chamber 350 and the flow collection cavity 360.

[0484] In this embodiment of the application, the protective component 300 may include one or more components. In some examples, the protective component 300 includes a protective plate 310, which is connected to the housing component 100 and encloses the housing component 100 to form a receiving space, at least a portion of which forms an air-cooled chamber 350.

[0485] In some examples, the protective assembly 300 also includes a manifold 340 disposed within the receiving space; that is, the manifold 340 is disposed between the protective panel 310 and the first wall 120. The manifold 340 may be connected to at least one of the protective panel 310 and the housing assembly 100.

[0486] In some examples, the manifold 340 is connected to the protective plate 310 and the first wall 120 respectively. A part of the protective plate 310, together with the manifold 340 and the housing assembly 100, forms an air-cooled chamber 350, and another part of the protective plate 310, together with the manifold 340, forms a manifold cavity 360.

[0487] In this embodiment, the current collector 340 can be enclosed with the protective plate 310 to form a current collector cavity 360. The current collector 340 is provided with a sub-flow port 341. The current collector cavity 360 is connected to the air-cooled chamber 350 through the sub-flow port 341. The first air outlet 311 and the second air outlet 312 can be provided on the protective plate 310. The current collector cavity 360 is connected to the outside through the first air outlet 311 and / or the second air outlet 312.

[0488] In one example, the aircraft includes a cabin shell 900 with a communication hole 121, a protective component 300 connected to the cabin shell 900, and a first air vent 311 / a second air vent 312 connected to the external environment through the communication hole 121 of the cabin shell 900.

[0489] In this embodiment, the current collector 340 can be provided with multiple sub-ports 341, which correspond to different positions of the first wall 120. That is, the heat exchange medium in the current collector cavity 360 can be distributed to different positions of the first wall 120 through the multiple sub-ports 341, thereby realizing the distribution of the heat exchange medium. For example, more heat exchange medium can be distributed to positions with more heat, such as the pressure relief section 211, while less heat exchange medium can be distributed to the gaps between the battery cells 200.

[0490] It should be noted that multiple flow collection cavities 360 are formed between the flow collection component 340 and the protective plate 310, or multiple flow collection components 340 are provided on the protective plate 310, and each flow collection component 340 is provided with a flow collection cavity 360. Some of the flow collection cavities 360 are connected to the second air outlet 312, and other flow collection cavities 360 are connected to the first air outlet 311. The different flow collection cavities 360 are isolated from each other.

[0491] In some examples, the protective plate 310 is provided with two flow collectors 340, namely a first flow collector 340a and a second flow collector 340b. The flow collector cavity 360 formed by the first flow collector 340a is connected to the first air outlet 311, and the flow collector cavity 360 formed by the second flow collector 340b is connected to the second air outlet 312.

[0492] During the flow of the heat exchange medium, the heat exchange medium enters the collection cavity 360 corresponding to the first collector 340a through the first air outlet 311. The heat exchange medium is distributed through the sub-outlet 341 corresponding to the collection cavity 360. The distributed heat exchange medium enters the air-cooled chamber 350 and exchanges heat with the first wall 120. The heat exchange medium after heat exchange enters the corresponding collection cavity 360 through the sub-outlet 341 of the second collector 340b, and flows out of the battery device through the second air outlet 312 connected to the collection cavity 360.

[0493] The technical solution of this application embodiment, by setting up a flow collector 340, forms a flow collector cavity 360, which connects to the first air outlet 311 and the second air outlet 312, facilitating the inflow or outflow of the heat exchange medium and reducing turbulence. The sub-outlets 341 of the flow collector 340 can distribute the heat exchange medium, so as to distribute different flow rates of heat exchange medium to different positions in the air-cooled chamber 350, thereby improving the utilization rate of the heat exchange medium and facilitating the temperature equalization of the battery device.

[0494] Reference Figure 25 In some embodiments, a boss structure is formed on the current collector 340. The current collector 340 includes a connected abutment portion 342 and a protrusion portion 343. The abutment portion 342 abuts against the protective plate 310. The protrusion portion 343 protrudes to the side away from the protective plate 310 and towards the air-cooled chamber 350 to form a boss structure. A current collecting cavity 360 is formed between the protrusion portion 343 and the protective plate 310. The sub-flow port 341 is provided on the protrusion portion 343 and opens towards the air-cooled chamber 350.

[0495] In this embodiment, the current collector 340 includes a protrusion 343 that protrudes away from the protective plate 310, thereby forming a boss structure. In other words, the protrusion 343 protrudes away from the protective plate 310 and forms a current collecting cavity 360 between it and the protective plate 310.

[0496] In this embodiment, the protective plate 310 further includes an abutment portion 342, which is connected to the protective plate 310 and connected to the protrusion 343. It is understood that the abutment portion 342 is arranged around the protrusion 343. The abutment portion 342 and the protrusion 343 can be connected by means of integral molding or other methods, thus achieving good sealing performance.

[0497] In this embodiment, the connection between the protective plate 310 and the housing assembly 100 can be achieved through snap-fitting, welding, bonding, threaded connection, fastener connection, etc. The connection between the current collector 340 and the protective plate 310 / housing assembly 100 can also be achieved through snap-fitting, welding, bonding, threaded connection, fastener connection, etc.

[0498] In some examples, the protective panel 310 includes a main structure 313 and a flange structure 314. The main structure 313 is disposed relative to the first wall 120, and the flange structure 314 surrounds the edge of the main structure 313. The flange structure 314 is connected to the housing assembly 100 and may be connected to the first wall 120 and / or the side wall 130.

[0499] In the technical solution of this application embodiment, the flow collector 340 forms a flow collecting cavity 360 through a boss structure, which has a simple structure and good sealing performance. The sub-flow port 341 is provided on the protrusion 343 so that the sub-flow port 341 can be connected to the flow collecting cavity 360. The sub-flow port 341 faces the air-cooled chamber 350, which facilitates the flow of heat exchange medium between the flow collecting cavity 360 and the air-cooled chamber 350.

[0500] Reference Figure 25 In some embodiments, the sub-outlet 341 includes a first sub-outlet 3411, which is projected onto the same projection plane along the thickness direction of the first wall 120. The projection of the first sub-outlet 3411 does not overlap with the projection of the first air outlet 311 and the projection of the second air outlet 312.

[0501] In this embodiment, the sub-port 341 includes a first sub-port 3411, which is projected along the thickness direction (third direction Z) of the first wall 120. The projection of the first sub-port 3411 provided by the first collector 340a does not overlap with the projection of the first air outlet 311, and the projection of the second sub-port 3412 provided by the second collector 340b does not overlap with the projection of the second air outlet 312. In other words, the first sub-port 3411 is offset relative to the first air outlet 311 / second air outlet 312.

[0502] In some examples, the manifold 340 includes a first extension structure 344 and a second extension structure 345, the first extension structure 344 extending along a second direction Y, the second extension structure 345 extending along a first direction X, and the second extension structure 345 extending from the edge of the protective assembly 300 toward the center.

[0503] The first air inlet 311 and the second air inlet 312 on the protective plate 310 are located at the second extension structure 345 of the corresponding collector 340, and the first sub-inlet 3411 of the collector 340 is located at the first extension structure 344. This is so that the first sub-inlet 3411 is offset relative to the first air inlet 311 and the second air inlet 312.

[0504] In some examples, multiple first sub-ports 3411 are arranged sequentially along the second direction Y, and the distance between two adjacent first sub-ports 3411 and the first air outlet 311 / second air outlet 312 between them is equal, so that the heat exchange medium is evenly distributed to the two first sub-ports 3411.

[0505] In the technical solution of this application embodiment, the first sub-flow port 3411 is staggered relative to the first air outlet 311 / second air outlet 312, which helps the heat exchange medium to flow in the collection cavity 360, thereby distributing it to different positions in the air-cooled chamber 350 through different first sub-flow ports 3411, so as to balance the flow rate of different first sub-flow ports 3411.

[0506] Reference Figure 25 In some embodiments, the sub-port 341 further includes a second sub-port 3412, the opening area of ​​each first sub-port 3411 is larger than the opening area of ​​each second sub-port 3412, and the second sub-port 3412 is disposed opposite to the first air outlet 311 or the second air outlet 312.

[0507] In this embodiment, the sub-port 341 includes a second sub-port 3412, which is disposed opposite to the corresponding first air outlet 311 or second air outlet 312. Specifically, projecting along the thickness direction (third direction Z) of the first wall 120, the projection of the second sub-port 3412 disposed on the first collector 340a at least partially overlaps with the projection of the first air outlet 311, and the projection of the second sub-port 3412 disposed on the second collector 340b at least partially overlaps with the projection of the second air outlet 312.

[0508] In some examples, the first air vent 311 and the second air vent 312 on the protective plate 310 are located at the positions of the second extension structures 345 of the corresponding collector 340, and the second sub-air vent 3412 of the collector 340 is also located at the positions of the second extension structures 345. When there are multiple first air vents 311 / second air vents 312, each collector 340 may also include multiple second extension structures 345.

[0509] In some examples, multiple second sub-ports 3412 are sequentially disposed along the first direction X on the corresponding second extension structure 345. For the same second extension structure 345, the number and position of the second sub-ports 3412 and the first air outlet 311 / second air outlet 312 can be configured in a one-to-one correspondence.

[0510] In this embodiment, the first sub-port 3411 has a larger opening area, which helps to distribute the heat exchange medium through the first sub-port 3411. The second sub-port 3412 has a smaller opening area, which can effectively mitigate the impact and reduce the impact on the distribution of the heat exchange medium.

[0511] In some examples, multiple first sub-ports 3411 can have different sizes, and multiple second sub-ports 3412 can also have different sizes, with the minimum opening area of ​​the first sub-port 3411 being greater than the maximum opening area of ​​the second sub-port 3412. In other examples, multiple first sub-ports 3411 can have the same size, and multiple second sub-ports 3412 can also have the same size, with the opening area of ​​any first sub-port 3411 being greater than the opening area of ​​any second sub-port 3412.

[0512] In the technical solution of this application embodiment, the second sub-flow port 3412 is arranged opposite to the first air outlet 311 / second air outlet 312, which helps to reduce the impact of the heat exchange medium on the manifold 340. In other words, the heat exchange medium can be depressurized through the second sub-flow port 3412, thereby improving the structural and connection stability of the manifold 340.

[0513] Reference Figure 33 In some embodiments, the battery cell 210 has a pressure relief section 211, and the battery cell 210 is arranged such that the pressure relief port of the pressure relief section 211 faces the air-cooled chamber 350. The battery device also includes a heat absorption component 400, which is disposed in the air-cooled chamber 350 and disposed on the protective plate 310 opposite to the pressure relief section 211 of the battery cell 210.

[0514] In this embodiment, the pressure relief section 211 is used to release internal gas when the internal pressure of the battery cell 210 rises abnormally (such as in the case of overcharging, overheating or short circuit), so as to prevent the battery from exploding or catching fire.

[0515] In some examples, the pressure relief section 211 includes a safety valve. If the gas pressure inside the battery cell 210 exceeds the pressure threshold of the safety valve, it can be released through the safety valve. That is, the gas inside the battery cell 210 flows out through the pressure relief port, thereby reducing the pressure inside the battery cell 210.

[0516] In some examples, the protective plate 310 is connected to the housing assembly 100 and together with the housing assembly 100 forms a pressure relief chamber 320. The pressure relief port communicates with the pressure relief chamber 320. In some examples, the protective plate 310 and the housing assembly 100 enclose a wind-cooled chamber 350, which is used for the flow of the heat exchange medium. The wind-cooled chamber 350 can also serve as the pressure relief chamber 320, achieving functional reuse of a single chamber, which helps improve space utilization and simplify the structure.

[0517] In some examples, the air-cooled chamber 350 can be combined with the heat-absorbing component 400. In other words, the air-cooled chamber 350 serves as a communication channel between the heat-absorbing component 400 and the pressure relief section 211. The air-cooled chamber 350 can exchange heat with the battery cell 210 through the heat exchange medium. The air-cooled chamber 350 can also quickly guide the high-pressure and high-temperature pressure relief airflow at the pressure relief section 211 to the heat-absorbing component 400, and / or quickly export the pressure relief airflow to the outside of the battery device through the first air outlet 311 / second air outlet 312.

[0518] In this embodiment, the heat-absorbing component 400 refers to a component capable of absorbing heat to lower the ambient temperature, thereby enabling the battery cell 210 to operate within a suitable temperature range. The heat-absorbing component 400 can be a phase change heat-absorbing structure, a heat pipe heat-absorbing structure, a liquid cooling plate structure, a thermoelectric heat-absorbing structure, etc.

[0519] In this embodiment, the heat-absorbing component 400 and the pressure relief portion 211 of the battery cell 210 are opposite each other, meaning that the heat-absorbing component 400 and the corresponding pressure relief portion 211 are arranged sequentially along a certain direction, and the airflow between them can also flow along that direction. That is, the pressure relief airflow released by the pressure relief portion 211 can flow to the heat-absorbing component 400 along that direction. The relative direction between the heat-absorbing component 400 and the battery cell 210 can be arranged at an angle to the first wall 120, for example, the relative direction between the heat-absorbing component 400 and the battery cell 210 is the third direction Z.

[0520] In this embodiment of the application, the heat-absorbing component 400 may be disposed on one or more components of the protective component 300. For example, the heat-absorbing component 400 is disposed at the position of the protective plate 310 corresponding to the pressure relief part 211.

[0521] The technical solution of this application embodiment, by setting a heat-absorbing component 400 and an air-cooled chamber 350, with the heat-absorbing component 400 positioned relative to the pressure relief part 211, allows the pressure relief airflow generated by the pressure relief part 211 to be effectively conducted from the air-cooled chamber 350 to the heat-absorbing component 400, where the heat-absorbing component 400 absorbs heat, thereby reducing the risk of the battery cell 210 running out of control due to high temperature. Furthermore, the air-cooled chamber 350 serves both as a heat exchanger and a pressure relief unit, realizing the functional reuse of a single chamber, which helps to improve space utilization and simplify the structure.

[0522] Reference Figure 33 In some embodiments, the heat-absorbing component 400 includes at least a phase change layer 410 made of a phase change material, the first phase change temperature of which is in the range of 90°C to 150°C.

[0523] In this embodiment of the application, the phase change material is a material that can absorb or release heat through a change in physical state (such as from solid to liquid, or from liquid to gas) within a specific temperature range.

[0524] In this embodiment, the phase change material is at least one of deionized water, hydrated inorganic gel, and hydrated organic gel. In some examples, the phase change material is stored within the pores of an adsorbent material. The adsorbent material is at least one of acrylic foam, melamine foam, polyurethane foam, and silicone foam.

[0525] In this embodiment, the first phase change temperature of the phase change material is the temperature at which the phase change material undergoes a physical transformation and absorbs heat. A higher first phase change temperature results in better heat absorption capacity, making it easier to absorb more heat. A lower first phase change temperature helps to maintain the battery cell 210 at a more suitable temperature.

[0526] In some examples, the first phase transition temperature ranges from 90°C to 150°C. For example, the first phase transition temperature is 90°C, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, etc.

[0527] In this embodiment, the phase change material may also have a second phase change temperature, which is the temperature at which the phase change material undergoes a physical transformation and releases heat. In a low-temperature environment, the heat released by the phase change material can maintain the battery cell 210 at a suitable temperature, reducing the possibility of the battery cell 210 failing due to low temperature.

[0528] In some examples, the second phase transition temperature ranges from -40°C to 0°C. For example, the second phase transition temperatures are -40°C, -30°C, -20°C, -10°C, 0°C, etc.

[0529] The technical solution of this application embodiment provides a phase change layer 410. The phase change material of the phase change layer 410 can absorb or release heat, and the phase change temperature of the phase change layer 410 is set within a suitable range. The phase change layer 410 absorbs heat to reduce the possibility of thermal runaway of the battery cell 210 and releases heat to reduce the possibility of low-temperature failure of the battery cell 210, so as to provide a suitable temperature environment for the battery cell 210.

[0530] Reference Figure 33 In some embodiments, the heat absorption assembly 400 further includes a heat-conducting layer 420, which is stacked with the phase change layer 410. Along the stacking direction, the heat-conducting layer 420 is located at least on the side of the phase change layer 410 near the pressure relief portion 211.

[0531] In this embodiment, the thermally conductive layer 420 is used for rapid and even heat conduction, thereby improving the heat transfer efficiency between the pressure relief section 211 and the phase change layer 410. The material of the thermally conductive layer 420 can be one or more combinations of titanium, steel, copper, silver, ceramics, and graphene.

[0532] In this embodiment, the stacking direction of the thermal conductive layer 420 and the phase change layer 410 may be at an angle to the extension direction of the first wall 120. For example, the thermal conductive layer 420 and the phase change layer 410 are stacked along the third direction Z.

[0533] In this embodiment, the thermal conductive layer 420 can be disposed on the side of the phase change layer 410 close to the pressure relief part 211, or on the side of the phase change layer 410 away from the pressure relief part 211, or the thermal conductive layer 420 can be stacked on both sides of the phase change layer 410.

[0534] The technical solution of this application embodiment, by setting a heat-conducting layer 420, can improve the heat transfer efficiency between the pressure relief part 211 and the phase change layer 410, improve the temperature regulation capability of the heat absorption component 400, and thus improve the safety performance of the battery device.

[0535] Reference Figure 25 and Figure 34In some embodiments, a separator 370 is provided between the first wall 120 and the protective plate 310. The separator 370 abuts against the first wall 120 and the protective plate 310 respectively to define the pressure relief chamber 320. The heat absorption assembly 400 is located in the pressure relief chamber 320. The separator 370 is configured to break in the event of thermal runaway of the battery cell 210, thereby connecting the pressure relief chamber 320 with the current collector 360.

[0536] In this embodiment, the partition 370 is used to separate the receiving space between the first wall 120 and the protective plate 310. The partition 370 can also be used to define the boundaries of the pressure relief chamber 320, the air-cooled chamber 350, etc. In some examples, the partition 370 abuts against the first wall 120 and the protective plate 310 respectively, and defines the boundary of the pressure relief chamber 320.

[0537] In this embodiment of the application, the partition 370 can be a frame structure, a ring structure, etc. In some examples, the partition 370 is a rectangular frame structure. The length direction of the partition 370 is set along the first direction X, and the width direction of the partition 370 is set along the second direction Y. The partition 370 abuts against the first wall 120 and the protective plate 310 on both sides along the third direction Z, thereby forming a closed pressure relief cavity 320, and the heat absorption component 400 is located in the pressure relief cavity 320.

[0538] In this embodiment, in the absence of thermal runaway, the separator 370 can isolate the air-cooled chamber 350 from the pressure relief chamber 320, reducing the impact of the heat exchange medium on the pressure relief structure. In the event of thermal runaway of the battery cell 210, such as the ejection of pressure relief gas from the pressure relief section 211, the separator 370 can be broken by the pressure relief gas flow, thereby connecting the pressure relief chamber 320 to the current collector chamber 360.

[0539] In this embodiment, the fractured form of the separator 370 can be set with reference to the protective film 150 described above. Alternatively, the fracture of the separator 370 can be achieved through structure. For example, the side thickness of the separator 370 along the width direction is small, making it easy to be broken under the action of depressurized airflow; or, for example, the connection positions of each part of the separator 370 are provided with weakening structures such as grooves, so that the separator 370 fractures along the weakening structure position under the action of depressurized airflow.

[0540] The technical solution of this application embodiment, by setting the separator 370, facilitates the definition of the pressure relief chamber 320, so as to keep the pressure relief chamber 320 sealed relative to the external environment. The separator 370 can also break under the action of the pressure relief airflow ejected by the pressure relief part 211, so that the pressure relief airflow enters the collector chamber 360 and is discharged to the external environment through the collector chamber 360, thereby improving the safety performance of the battery device.

[0541] Reference Figure 35In some embodiments, the battery cell 210 has a pressure relief section 211, and the battery cell 210 is arranged such that the pressure relief port of the pressure relief section 211 faces the air-cooled chamber 350. The battery device also includes a heat absorption component 400, which is disposed in the air-cooled chamber 350 and disposed on the current collector 340 opposite to the pressure relief section 211 of the battery cell 210.

[0542] In this embodiment, the pressure relief section 211 is used to release internal gas when the internal pressure of the battery cell 210 rises abnormally (such as in the case of overcharging, overheating or short circuit), so as to prevent the battery from exploding or catching fire.

[0543] In some examples, the pressure relief section 211 includes a safety valve. If the gas pressure inside the battery cell 210 exceeds the pressure threshold of the safety valve, it can be released through the safety valve. That is, the gas inside the battery cell 210 flows out through the pressure relief port, thereby reducing the pressure inside the battery cell 210.

[0544] In some examples, the protective plate 310 is connected to the housing assembly 100 and together with the housing assembly 100 forms a pressure relief chamber 320. The pressure relief port communicates with the pressure relief chamber 320. In some examples, the protective plate 310 and the housing assembly 100 enclose a wind-cooled chamber 350, which is used for the flow of the heat exchange medium. The wind-cooled chamber 350 can also serve as the pressure relief chamber 320, achieving functional reuse of a single chamber, which helps improve space utilization and simplify the structure.

[0545] In some examples, the air-cooled chamber 350 can be combined with the heat-absorbing component 400. In other words, the air-cooled chamber 350 serves as a communication channel between the heat-absorbing component 400 and the pressure relief section 211. The air-cooled chamber 350 can exchange heat with the battery cell 210 through the heat exchange medium. The air-cooled chamber 350 can also quickly guide the high-pressure and high-temperature pressure relief airflow at the pressure relief section 211 to the heat-absorbing component 400, and / or quickly export the pressure relief airflow to the outside of the battery device through the first air outlet 311 / second air outlet 312.

[0546] In this embodiment, the heat-absorbing component 400 refers to a component capable of absorbing heat to lower the ambient temperature, thereby enabling the battery cell 210 to operate within a suitable temperature range. The heat-absorbing component 400 can be a phase change heat-absorbing structure, a heat pipe heat-absorbing structure, a liquid cooling plate structure, a thermoelectric heat-absorbing structure, etc.

[0547] In this embodiment, the heat-absorbing component 400 and the pressure relief portion 211 of the battery cell 210 are opposite each other, meaning that the heat-absorbing component 400 and the corresponding pressure relief portion 211 are arranged sequentially along a certain direction, and the airflow between them can also flow along that direction. That is, the pressure relief airflow released by the pressure relief portion 211 can flow to the heat-absorbing component 400 along that direction. The relative direction between the heat-absorbing component 400 and the battery cell 210 can be arranged at an angle to the first wall 120, for example, the relative direction between the heat-absorbing component 400 and the battery cell 210 is the third direction Z.

[0548] In this embodiment of the application, the heat absorption component 400 may be disposed on one or more components of the protective component 300. For example, the heat absorption component 400 is disposed at the position of the current collector 340 corresponding to the pressure relief part 211. In other words, the heat absorption component 400 is disposed on the side of the current collector 340 away from the protective plate 310.

[0549] The technical solution of this application embodiment, by setting a heat-absorbing component 400 and an air-cooled chamber 350, with the heat-absorbing component 400 positioned relative to the pressure relief part 211, allows the pressure relief airflow generated by the pressure relief part 211 to be effectively conducted from the air-cooled chamber 350 to the heat-absorbing component 400, where the heat-absorbing component 400 absorbs heat, thereby reducing the risk of the battery cell 210 running out of control due to high temperature. Furthermore, the air-cooled chamber 350 serves both as a heat exchanger and a pressure relief unit, realizing the functional reuse of a single chamber, which helps to improve space utilization and simplify the structure.

[0550] In some embodiments, the protective panel 310 comprises a laminated structure formed by fiber-reinforced composite material layers.

[0551] In this embodiment, the protective plate 310 has a laminated structure, which is made of fiber-reinforced composite material layers. The protective plate 310 may include one or more fiber-reinforced composite material layers.

[0552] In some examples, the fiber-reinforced composite layer includes a third substrate and a third fiber.

[0553] In one example, the third substrate is one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; in other examples, the third substrate is composed of two or more of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0554] In some examples, the third fiber is either carbon fiber or polyethylene fiber; in other examples, the third fiber is a composite of carbon fiber and polyethylene fiber.

[0555] The protective plate 310 formed by the fiber-reinforced composite material layer in this application embodiment has good structural strength and can also provide heat insulation, corrosion resistance and other properties according to the auxiliary materials.

[0556] Reference Figure 28 and Figure 29 In some embodiments, the protective component 300 is connected to the first wall 120, and the connection has a sealing structure.

[0557] In this embodiment of the application, the connection between the protective component 300 and the first wall 120 can be that the protective plate 310 is connected to the first wall 120, or other structures of the protective component 300 can be connected to the first wall 120, such as the separator 370 or the current collector 340 connected to the first wall 120.

[0558] In this embodiment, the sealing structure can be disposed between the protective plate 310 and the first wall 120, or between the collector 340 and the first wall 120, or between the collector 340 and the protective plate 310, or the sealing structure can be disposed between the separator 370 and the first wall 120 / protective plate 310.

[0559] In this embodiment, the sealing structure can be a sealing ring, a sealing gasket, a sealing filler, etc., and the sealing structure can be made of elastic materials such as rubber and silicone, thereby achieving a good sealing effect.

[0560] The technical solution of this application embodiment, by setting a sealing structure, is located at the connection position between the protective component 300 and the first wall 120, thereby isolating the cavity such as the pressure relief chamber 320 from the external environment, or limiting the space of the air-cooled chamber 350 and the collection chamber 360, so as to maintain the integrity of the flow channel of the heat exchange medium / pressure relief airflow and reduce the possibility of air leakage.

[0561] Reference Figure 25 and Figure 32 In some embodiments, the battery device further includes a cover 500 connected to the housing assembly 100 to enclose the receiving cavity 110; the cover 500 includes a stacked insulating structural layer C10 and a fiber composite material layer C20, with the insulating structural layer C10 located between the fiber composite material layer C20 and the battery cell 210.

[0562] In this embodiment, the cover 500 is connected to the housing assembly 100. The connection between the cover 500 and the housing assembly 100 can be by snap-fit, bonding, welding, integral molding, fastener connection, threaded connection, etc. The cover 500, connected to the housing assembly 100, closes the receiving cavity 110. It can be understood that the cover 500 can cover the opening of the housing assembly 100.

[0563] It should be noted that the connection between the cover 500 and the housing assembly 100 can be a butt joint, that is, the side of the cover 500 near the first wall 120 abuts against the side of the side wall 130 away from the first wall 120, and the abutting portion at least surrounds the receiving cavity 110. The connection between the cover 500 and the housing assembly 100 can also be a sleeve joint, that is, at least a portion of the cover 500 extends into the receiving cavity 110; or, at least a portion of the housing assembly 100 extends into the cover 500, and the extended portion at least surrounds the receiving cavity 110.

[0564] In some examples, the cover 500 is bonded to the housing assembly 100 with a high connection strength; in other examples, the cover 500 and the housing assembly 100 are fastened together with fasteners for easy disassembly and maintenance.

[0565] In this embodiment, the cover 500 is provided with an insulating structure layer C10 on the inner side of the cavity 110, or the cover 500 is provided with an insulating structure layer C10 on a portion of the inner side of the cavity 110. It is understood that the insulating layer provided as a whole has a better insulation effect.

[0566] The technical solution of this application embodiment, by setting a cover 500, can close the receiving cavity 110 connected to the housing assembly 100, so as to isolate the space where the battery cell 210 is located from the external environment. The cover 500 includes an insulating structural layer C10 and a fiber composite material layer C20. The fiber composite material layer C20 provides good structural strength, and the insulating structural layer C10 can electrically isolate the battery cell 210 from the outside world, reducing external interference to the battery cell 210. The combination of the insulating structural layer C10 and the fiber composite material layer C20 allows the cover 500 to take into account both structural strength and protective performance.

[0567] Reference Figure 32 In some embodiments, the housing assembly 100 further includes a plurality of sidewalls 130, the first wall 120 and the plurality of sidewalls 130 defining a receiving cavity 110, and the end face of the sidewall 130 facing away from the first wall 120 along the thickness direction of the first wall 120 being sealed to the cover 500.

[0568] In this embodiment, the sidewall 130 provides a constraint on the battery cell 210, thereby confining the battery cell 210 within the receiving cavity 110; the sidewall 130 can also limit the deformation of the battery cell 210 and the housing assembly 100 in the event of expansion of the battery cell 210, thereby improving the safety of the battery device.

[0569] In this embodiment, the number of sidewalls 130 can be two or more. The sidewalls 130 are connected to the first wall 120, and multiple sidewalls 130 are connected end to end to form a closed structure. In some examples, there are four sidewalls 130, and the four sidewalls 130 and the first wall 120 enclose an approximately rectangular receiving cavity 110.

[0570] In this embodiment, a first wall 120 and a cover 500 are respectively provided on both sides of the side wall 130 along the third direction Z. The end face of the side wall 130 away from the first wall 120 along the thickness direction (third direction Z) is connected to the cover 500, and the two are sealed together by sealing rings, sealing gaskets, sealing fillers, etc.

[0571] In the technical solution of this application embodiment, the cover 500 is connected to the side wall 130, which is easy to implement. The cover 500 and the side wall 130 are sealed together, which helps to seal the receiving cavity 110, thereby isolating the battery cell 210 in the receiving cavity 110 from the external environment.

[0572] Reference Figure 32 In some embodiments, there are multiple battery cells 210, and the multiple battery cells 210 are arranged in a battery cell row 220 along the first direction X; the housing assembly 100 also includes multiple side walls 130, the first wall 120 and the multiple side walls 130 define a receiving cavity 110, the side walls 130 also include beam members 134 arranged opposite to each other along the first direction X, the battery device also includes a composite tension plate 600, the composite tension plate 600 includes a main body 610 and a connecting part 620, the connecting part 620 is connected to the main body 610 and located at both ends of the main body 610 along the first direction X, and the connecting part 620 is connected to the beam member 134.

[0573] In this embodiment, the main body 610 can be the part of the composite pull plate 600 that contacts the battery cell 210 and limits the position of each battery cell 210 in the battery cell row 220. The main body 610 can contact the battery cell 210 directly or indirectly. The battery cell row 220 can be a component of the battery cell group 200. In the battery cell row 220, multiple battery cells 221 are arranged sequentially along the first direction X and connected into an integral structure.

[0574] In this embodiment of the application, one or more surfaces of the battery cell array 220 may be provided with the main body portion 610. The surface of the battery cell array 220 may be a surface facing away from the first wall 120, or a surface parallel to the first direction X or the second direction Y.

[0575] In some examples, the surface of the battery cell array 220 facing away from the first wall 120 and the surface of the battery cell array 220 parallel to the first direction X are both provided with a main body portion 610.

[0576] In this embodiment, the connecting part 620 is the part that connects the composite pull plate 600 to the box assembly 100. The connection between the connecting part 620 and the box assembly 100 can be welding, bonding, threaded connection, snap-fit, riveting, etc.

[0577] In this embodiment, the connecting portion 620 may be connected to one or more of the first wall 120, side plate member 133, beam member 134, and cover 500 of the composite housing. In some examples, the connecting portion 620 is connected to the beam member 134 so that the beam member 134 provides good support for the composite tension plate 600.

[0578] In this embodiment, the connecting portion 620 can be connected to the side of the beam member 134 near the receiving cavity 110, or to the side of the beam member 134 away from the receiving cavity 110, or both sides of the beam member 134 along the first direction X can be connected with the connecting portion 620. In some examples, the connecting portion 620 is connected to the side of the beam member 134 away from the receiving cavity 110.

[0579] In the technical solution of this application embodiment, the battery device is provided with a composite tension plate 600. The composite tension plate 600 effectively limits the battery cell arrangement 220 through the main body 610 and the connecting part 620, which can limit the expansion of the battery cell arrangement 220. The connecting part 620 of the composite tension plate 600 is connected to the beam member 134 so that part of the expansion force borne by the beam member 134 can be transmitted to the composite tension plate 600. In other words, the composite tension plate 600 can share the expansion force of the battery cell 210 with the beam member 134, thereby improving the modulus and strength of the housing assembly 100, especially improving the modulus of the housing assembly 100 along the first direction X, and reducing the probability of bending deformation of the beam member 134 and / or reducing the amount of deformation when the beam member 134 bends.

[0580] Reference Figure 36 , Figure 37 , Figure 38 and Figure 39 In some embodiments, the composite pull plate 600 includes at least one first pull plate 630 extending along a first direction X and covering at least a portion of the battery cell array 220 away from the first wall 120.

[0581] In this embodiment, the first pull plate 630 can cover the battery cell array 220 from the side of the battery cell array 220 away from the first wall 120. In other words, the first pull plate 630 and the first wall 120 are respectively disposed on both sides of the battery cell array 220 along the third direction Z.

[0582] It should be noted that the first pull plate 630 covering the battery cell array 220 can be a portion of the battery cell array 220, i.e., when projected along the third direction Z, the projection of the first pull plate 630 overlaps with the projection of the battery cell array 220; or, the first pull plate 630 covering the entire battery cell array 220, i.e., when projected along the third direction Z, the projection of the first pull plate 630 overlaps with the projection of the battery cell array 220 entirely.

[0583] In addition, the first pull plate 630 can cover one or more battery cell rows 220, as shown in the reference. Figure 38 In some examples, the housing assembly 100 is provided with multiple rows 220 of battery cells to form a battery cell array, and adjacent rows 220 of battery cells in the battery cell array share a first pull plate 630. Alternatively, refer to... Figure 37 In other examples, the first pull plate 630 partially or completely covers the single cell row 220.

[0584] In some examples, the main body 610 of the first pull plate 630 covers the battery cell array 220, and the connecting part 620 of the first pull plate 630 is disposed at both ends of the main body 610 along the first direction X and is respectively connected to the corresponding beam member 134. The main body 610 and the connecting part 620 of the first pull plate 630 can be formed by bending the same member.

[0585] In the technical solution of this application embodiment, the first pull plate 630 covers the battery cell array 220 along the thickness direction of the first wall 120, and can provide a limit for the battery cell array 220 in the thickness direction of the first wall 120 so as to fix the battery cell array 220 to the housing assembly 100. The first pull plate 630 can also resist the expansion force of the battery cell 210 along the thickness direction of the first wall 120.

[0586] Reference Figure 36 , Figure 39 and Figure 40 In some embodiments, the composite pull plate 600 further includes at least one second pull plate 640, which extends along a first direction X and covers at least a portion of the side of the battery cell array 220.

[0587] In this embodiment, the side of the battery cell array 220 can be a surface where the battery cell array 220 forms an angle with the first wall 120, such as a surface where the battery cell array 220 is parallel to the first direction X or the second direction Y.

[0588] In this embodiment, the second pull plate 640 covers at least a portion of the battery cell array 220 along the second direction Y. This can be achieved by projecting along the second direction Y, with the projection of the second pull plate 640 partially overlapping the projection of the battery cell array 220; or, the projection of the second pull plate 640 and the projection of the battery cell array 220 completely overlapping.

[0589] In some examples, the main body 610 of the second pull plate 640 covers the battery cell array 220, and the connecting portions 620 of the second pull plate 640 are disposed at both ends of the main body 610 along the first direction X and are respectively connected to the corresponding beam members 134. The main body 610 and the connecting portions 620 of the second pull plate 640 can be formed by bending the same member. The connecting portions 620 of the second pull plate 640 can be the same as or different from the connecting portions 620 of the first pull plate 630.

[0590] In the technical solution of this application embodiment, the second pull plate 640 extends along the first direction X and can cover at least a portion of the battery cell array 220, thereby bearing the expansion force of the battery cell 210 along the second direction Y, thereby further improving the modulus and strength of the housing assembly 100. The second pull plate 640 is connected to the beam member 134, which can further improve the deformation constraint force on the beam member 134, thereby further improving the structural strength of the housing assembly 100.

[0591] Reference Figure 36 and Figure 40 In some embodiments, multiple battery cell arrays 220 are arranged along a second direction Y to form a battery cell array, and the second direction Y intersects with the first direction X; there are at least two second pull plates 640, and the second pull plates 640 cover both sides of the battery cell array in the first direction X.

[0592] In this embodiment of the application, the two sides of the first direction X of the battery cell array, that is, the surfaces of the battery cell array parallel to the first direction X, can be understood as the two sides being the surfaces of the two outermost battery cell groups in the battery cell array that are opposite to each other, since the battery cell array includes multiple battery cell rows 220.

[0593] In some examples, the second pull plate 640 may correspond to the surface arrangement of the battery cell array. In other examples, the second pull plate 640 may correspond to the surface arrangement of the battery cell row 220, that is, the second pull plate 640 is provided on one or both sides of the surface of the battery cell row 220 parallel to the first direction X.

[0594] In the technical solution of this application embodiment, the second pull plate 640 covers the surface of the battery cell array parallel to the first direction X. The second pull plate 640 and the first pull plate 630 form an enclosing structure, and the two can provide limiting for the battery cell array from multiple directions in order to improve the structural strength of the housing assembly 100.

[0595] In some embodiments, the composite sheet 600 includes a fourth substrate and a fourth fiber. The fourth fiber is a continuous fiber and its extension direction is consistent with the first direction X. The fourth fiber includes at least one of glass fiber, basalt fiber, and aramid fiber. The fourth substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

[0596] In this embodiment, the composite sheet 600 is made of composite material. This can mean that at least a portion of the structure of the composite sheet 600 is made of composite material, or that the entire structure of the composite sheet 600 is made of composite material. Composite materials are lightweight and high-strength, which helps to reduce the weight of the composite sheet 600 and improve its structural strength.

[0597] In some examples, the composite sheet 600 includes a fourth substrate and a fourth fiber, the fourth fiber being a continuous fiber and extending along a first direction X, which helps to improve the structural strength of the composite sheet 600 along the first direction X and enhance the ability of the composite sheet 600 to withstand the expansion force in the first direction X.

[0598] It is understandable that the composite sheet 600 is in contact with the battery cell 210 and needs to have insulating properties. In some examples, the composite sheet 600 and the insulating structural layer C10 use the same or similar structure / material.

[0599] In some examples, the insulating structure layer C10 includes one or more layers of fourth fiber fabric, each layer of fourth fiber fabric including at least two intersecting fourth fibers; in other examples, the insulating structure layer C10 includes two or more layers of fourth fiber fabric, multiple fourth fibers in the same fourth fiber fabric are arranged in parallel, and fourth fibers in at least two fourth fiber fabrics are intersecting.

[0600] In some examples, the fourth substrate is one of polyurethane, epoxy resin, phenolic resin, polyamide resin, or ceramizable resin; in other examples, the fourth substrate is composed of two or more of polyurethane, epoxy resin, phenolic resin, polyamide resin, or ceramizable resin.

[0601] In some examples, the fourth fiber is either carbon fiber or polyethylene fiber; in other examples, the fourth fiber is a composite of carbon fiber and polyethylene fiber.

[0602] In some examples, the fourth substrate includes polyurethane, and the fourth fiber includes one or more of carbon fiber and polyethylene fiber. The fourth fiber fabric composed of polyurethane and the fourth fiber has advantages such as high elasticity, abrasion resistance and high tear strength.

[0603] In some examples, the fourth substrate includes epoxy resin, and the fourth fiber includes one or more of carbon fiber and polyethylene fiber. The fourth fiber fabric composed of epoxy resin and fourth fiber has advantages such as good adhesion, high mechanical strength and strong corrosion resistance.

[0604] In some examples, the fourth substrate includes phenolic resin, and the fourth fiber includes one or more of carbon fiber and polyethylene fiber. The fourth fiber fabric composed of phenolic resin and fourth fiber has advantages such as good heat resistance and good flame retardancy.

[0605] In some examples, the fourth substrate includes polyamide resin, and the fourth fiber includes one or more of carbon fiber and polyethylene fiber. The fourth fiber fabric composed of polyamide resin and fourth fiber has advantages such as high strength, good abrasion resistance, and good oil resistance.

[0606] In some examples, the fourth substrate includes a ceramizable resin, and the fourth fiber includes one or more of carbon fiber and polyethylene fiber. The fourth fiber fabric composed of the ceramizable resin and the fourth fiber has advantages such as good structural stability, high temperature resistance, and good flame retardancy.

[0607] In some examples, the fourth fiber includes carbon fiber, and the fourth substrate includes polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin. The fourth fiber fabric composed of carbon fiber and the fourth substrate has advantages such as high strength, low density, corrosion resistance, and good thermal stability.

[0608] In some examples, the fourth fiber includes polyethylene fiber, and the fourth substrate includes polyurethane, epoxy resin, phenolic resin, polyamide resin, ceramizable resin. The fourth fiber fabric composed of polyethylene fiber and the fourth substrate has advantages such as high strength and toughness, low density, and ease of processing.

[0609] The technical solution of this application embodiment is that the composite material formed by the fourth substrate and the fourth fiber has the characteristics of being lightweight and high-strength, which is beneficial to reducing the weight of the composite sheet 600 and improving the structural strength of the composite sheet 600. In addition, the fourth fiber extends along the first direction X, which can improve the ability of the composite sheet 600 to withstand the expansion force in the first direction X.

[0610] Reference Figure 36 and Figure 40 In some embodiments, the battery device further includes a sampling component 700 located between the first pull plate 630 and the battery cell array 220. The sampling component 700 has at least one output element 710. The first pull plate 630 is provided with a second clearance notch 631, which is positioned corresponding to the output element 710.

[0611] In this embodiment, the sampling component 700 can be used to detect parameters such as voltage, current, and temperature of the battery cell 210 or the battery cell array 220. The output component 710 is used to electrically connect to an external controller, thereby outputting the data collected by the sampling component 700 to the external controller. The output component 710 can be a conductive post, conductive sheet, conductive wire, etc.

[0612] In this embodiment, the first pull plate 630 includes a second clearance notch 631 corresponding to the output member 710. The shape and position of the second clearance notch 631 can be determined according to the specific shape and position of the output member 710. The second clearance notch 631 can be a groove provided on the edge of the first pull plate 630, or it can be a hole opened in the first pull plate 630. The second clearance notch 631 can be provided on the main body 610 and / or the connecting part 620 of the first pull plate 630.

[0613] In the technical solution of this application embodiment, the second clearance notch 631 can avoid the output component 710, improve the structural compactness of the housing assembly 100, optimize the stress distribution of the first pull plate 630, and thus improve its structural strength.

[0614] Reference Figure 36 In some embodiments, the beam member 134 is formed with at least one clearance groove 1341, and the output member 710 is at least partially located within the clearance groove 1341.

[0615] In this embodiment, the specific position and shape of the clearance groove 1341 can be determined according to the position and structure of the output member 710. It is only necessary to enable the output member 710 to extend through the clearance groove 1341 to the side of the beam member 134 away from the receiving cavity 110.

[0616] In this embodiment, the beam member 134 may have one or more clearance slots 1341. The clearance slots 1341 may correspond to a single output member 710 or multiple output members 710. In some examples, the beam member 134 is provided with multiple clearance slots 1341 along the second direction Y, and the clearance slots 1341, output members 710 and battery cell arrays 220 are correspondingly provided.

[0617] The technical solution of this application embodiment, by forming at least one clearance groove 1341 in the beam member 134, can meet the arrangement requirements of the sampling component 700 in the battery device, facilitate the connection of the output component 710 with the external controller, and also improve the structural compactness of the housing component 100 and save the internal space of the housing component 100.

[0618] Reference Figure 36 In some embodiments, the battery device further includes a busbar 800 located between the battery cell array 220 and the first pull plate 630, which is bonded to the busbar 800.

[0619] In this embodiment, the busbar 800 can be used as a conductive component to electrically connect multiple battery cells 210, and to collect and transmit the current between the battery cells 210 to an external circuit, or to distribute the current input from the external circuit to each battery cell 210.

[0620] In this embodiment, the busbar 800 can be made of rigid material or flexible material. The busbar 800 can be used for electrical connection of battery cells 210 in battery cell array 220, or to connect battery cell arrays 220 in battery cell array.

[0621] In some examples, the electrode assembly of the battery cell 210 is located on the side facing away from the first wall 120, and the busbar 800 is located on the side of the battery cell array 220 facing away from the first wall 120. It is understood that the electrode assembly can also be disposed on other surfaces of the battery cell 210, with the busbar 800 disposed corresponding to the electrode assembly.

[0622] In the technical solution of this application embodiment, the busbar 800 is bonded to the first pull plate 630, which helps to improve the connection strength and connection area between the first pull plate 630 and the battery cell array 220. On the other hand, the first pull plate 630 can also insulate the busbar 800 from the external space, thereby improving the insulation performance of the battery device. The first pull plate 630 can also provide protection for the busbar 800, reducing the possibility of the busbar 800 cracking due to deformation or disconnecting from the battery cell 210.

[0623] In some embodiments, the insulating structural layer C10 includes an insulating coating C13, which is selected from at least one of epoxy coating, silicone coating, polyurethane coating, fluorocarbon coating, silica coating, boron nitride coating, and vinyl resin coating.

[0624] In this embodiment, the insulating coating C13 can be a spray coating, dip coating, vapor deposition coating, spin coating, brush coating, etc.

[0625] In some examples, the insulating coating C13 includes one of the following materials: epoxy coating, silicone coating, polyurethane coating, fluorocarbon coating, silica coating, boron nitride coating, and vinyl resin coating.

[0626] In other examples, the insulating coating C13 is a mixture of two or more of the following: epoxy coating, silicone coating, polyurethane coating, fluorocarbon coating, silica coating, boron nitride coating, and vinyl resin coating.

[0627] The technical solution of this application embodiment has a thin and light insulating coating C13 structure, which is flexible and adaptable and can be used for complex structural surfaces.

[0628] Furthermore, this application provides a housing assembly 100, which includes a housing wall defining a receiving cavity 110. The housing assembly 100 includes a first wall 120, and the receiving cavity 110 is used to accommodate a battery cell 210. The first wall 120 includes an insulating structural layer C10 and a fiber composite material layer C20 stacked together. When the receiving cavity 110 contains a battery cell 210, the battery cell 210 is supported by the first wall 120. Along the thickness direction of the first wall 120, the insulating structural layer C10 is located between the fiber composite material layer C20 and the battery cell 210.

[0629] In the technical solution of this application embodiment, the housing assembly 100 can accommodate the battery cell 210 and provide protection and restraint for the battery cell 210. The fiber composite material layer C20 provides good structural strength, and the insulating structural layer C10 is used to support the battery cell 210 and also to electrically isolate the battery cell 210 from the outside world, reducing external interference to the battery cell 210. The combination of the insulating structural layer C10 and the fiber composite material layer C20 allows the housing assembly 100 to take into account both structural strength and protective performance.

[0630] Based on this, refer to Figure 1 This application provides an electrical device, which includes a battery device according to an embodiment of this application for providing electrical energy; or, it includes a plurality of battery cells 210 and a housing assembly 100 according to an embodiment of this application for accommodating the plurality of battery cells 210.

[0631] In some examples, the electrical device includes a battery device according to any embodiment of this disclosure. The battery device is used to provide electrical energy. The electrical device can be a vehicle, mobile phone, portable device, laptop, ship, aircraft, electric toy, and power tool, etc. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, 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 disclosure do not impose special limitations on the above-mentioned electrical devices.

[0632] In the technical solution of this application embodiment, the housing assembly 100 can accommodate the battery cell 210 and provide protection and restraint for the battery cell 210. The fiber composite material layer C20 provides good structural strength, and the insulating structural layer C10 serves both to support the battery cell 210 and to electrically isolate the battery cell 210 from the outside world, reducing external interference to the battery cell 210. The combination of the insulating structural layer C10 and the fiber composite material layer C20 allows the housing assembly 100 to balance structural strength and protective performance. Lightweight design of battery devices in aircraft, vehicles, and ships also helps to improve the acceleration, maximum speed, and range of aircraft, vehicles, and ships.

[0633] Reference Figure 1 In some embodiments, the electrical equipment includes an aircraft. By mounting a battery device on the aircraft, the battery device can provide electrical power to enable the aircraft to fly. The aircraft's housing assembly 100 has high structural strength and good protective performance.

[0634] In this context, "aircraft" generally refers to any device that flies within or outside the atmosphere (space), including both atmospheric aircraft and spacecraft. Aircraft can include airplanes, airships, etc., and for example, low-altitude aircraft, eVTOL (electric vertical take-off and landing) aircraft, commuter aircraft, regional jets, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft. For example, an aircraft could be a cargo drone.

[0635] In the technical solution of this application embodiment, the housing assembly 100 can accommodate the battery cell 210 and provide protection and restraint for the battery cell 210. The fiber composite material layer C20 provides good structural strength, and the insulating structural layer C10 not only supports the battery cell 210 but also electrically isolates the battery cell 210 from the outside world, reducing external interference to the battery cell 210. The combination of the insulating structural layer C10 and the fiber composite material layer C20 allows the housing assembly 100 to balance structural strength and protective performance. The lightweight design of the battery device in the aircraft also helps to improve the acceleration, maximum speed, and range of the aircraft, vehicle, and ship.

[0636] In some specific embodiments, the battery device is installed on the aircraft and is used to provide electrical power to the aircraft. The battery device includes a housing assembly 100, a cover 500 and an array of battery cells. The housing forms a receiving cavity 110. The cover 500 can be connected to the housing assembly 100 to seal the receiving cavity 110. The array of battery cells is disposed within the receiving cavity 110.

[0637] The battery cell array includes at least two battery cell groups 200, which are arranged sequentially along a second direction Y. Each battery cell group 200 includes multiple battery cells 210. The multiple battery cells 210 in the same battery cell group 200 are arranged along a first direction X. The battery cells 210 are approximately cuboid in shape, with their length direction along a third direction Z. The thickness direction of the battery cells 210 is parallel to the first direction X, which is the direction in which the thermal expansion force of the battery cells 210 is greater. A pressure relief section 211 is provided on the side of the battery cells 210 near the first wall 120. The pressure relief section 211 includes a pressure relief port, which can discharge the high-temperature and high-pressure gas generated by the battery cells 210.

[0638] The housing assembly 100 includes a first wall 120, two side plate members 133, and two beam members 134. The first wall 120 is used to support the battery cell array. The two beam members 134 are arranged on opposite sides of the first wall 120 along a first direction X. The two side plate members 133 are arranged on opposite sides of the first wall 120 along a second direction Y. The side plate members 133 and beam members 134 are both connected to the first wall 120. Adjacent side plate members 133 and beam members 134 are connected. A support structure 132 is provided in the hollow cavity 131 of the side plate members 133 and beam members 134. The housing assembly 100 is approximately a cuboid structure. The housing assembly 100 has an opening on one side opposite the receiving cavity 110. The cover 500 is sealed to the opening, thereby isolating the battery cell array from the external environment.

[0639] The first wall 120 includes an insulating structural layer C10 and a fiber composite material layer C20 stacked along a third direction Z, with the insulating structural layer C10 located on the side of the first wall 120 facing the battery cell 210; the beam member 134 includes an insulating structural layer C10 and a fiber composite material layer C20 stacked at least along a first direction X, with the insulating structural layer C10 located on the side of the beam member 134 facing the battery cell 210, and in the beam member 134, the insulating structural layer C10 and the fiber composite material layer C20 are stacked in the beam... The side of component 134 facing away from the receiving cavity 110 forms a butt-joint or overlapping connection structure 140; the side plate component 133 includes an insulating structural layer C10 and a fiber composite material layer C20 stacked along the second direction Y, and the insulating structural layer C10 is located on the side of the side plate component 133 facing the battery cell 210. In the side plate component 133, the insulating structural layer C10 and the fiber composite material layer C20 form an overlapping connection structure 140 on the side of the side plate component 133 facing away from the first wall 120. The cover 500 includes an insulating structural layer C10 and a fiber composite material layer C20 stacked along the third direction Z, and the insulating structural layer C10 is located on the side of the cover 500 facing the battery cell 210.

[0640] The first wall 120 also includes a reinforcing layer 122, which includes a fiber-reinforced composite material, including carbon fiber and polyethylene fiber. The insulating structural layer C10 includes a first fiber fabric C11, which includes a first fiber C111, which includes a glass fiber, basalt fiber, and aramid fiber. The insulating structural layer C10 may also include an insulating coating C13. The fiber composite material layer C20 includes a second fiber fabric C21, which includes a second fiber C211, which includes carbon fiber and polyethylene fiber.

[0641] The side panel component 133 is approximately a cuboid plate structure. The side panel component 133 forms a hollow cavity 131. A connecting layer 1321 and a first support 1322 are disposed in the hollow cavity 131 of the side panel component 133. The connecting layer 1321 is located between the first support 1322 and the insulating structure layer C10, and covers at least a portion of the first support 1322. The connecting layer 1321 includes a fiber-reinforced composite material layer, and the first support 1322 includes a foam layer.

[0642] The beam member 134 is approximately a trapezoidal plate structure, extending away from the first wall 120 along the third direction Z. The sidewall of the beam member 134 away from the receiving cavity 110 gradually approaches the receiving cavity 110. The beam member 134 forms a hollow cavity 131, within which a second support 1323 and a third support 1324 are disposed. The second support 1323 includes a support plate 13231 and an extension plate 13232, with the support surface of the support plate 13231 facing the insulating structural layer C10. The extension plate 13232 is integrally formed with the support plate 13231 and extends along the direction close to the receiving cavity 110, reaching the first wall 120. It can provide support for some of the battery cells 210. The support plate 13231 is provided with an extension plate 13232 for each battery cell group 200.

[0643] The first wall 120 has a through hole 121 corresponding to the pressure relief port of the pressure relief part 211. The extension plate 13232 is provided with a first clearance notch 13233. The projections of the through hole 121 and the first clearance notch 13233 completely cover the projection of the pressure relief port. The pressure relief airflow ejected from the pressure relief port passes through the through hole 121 and the first clearance notch 13233 and passes through the first wall 120.

[0644] The third support 1324 includes a foam layer that fills the space between the second support 1323 and the fiber composite material layer C20. The second support 1323 may also include a support rib 13234, which is located on the side of the support plate 13231 opposite to the receiving cavity 110 and extends along the first direction X. The foam layer covers the support rib 13234. Alternatively, the third support 1324 may include a fiber composite shell, which may be made of fiber-reinforced composite material. The fiber composite shell may include one or more chambers, each with an opening facing the support plate 13231.

[0645] The housing assembly 100 is provided with a mounting structure 135 at each of the four corners corresponding to the first wall 120. The mounting structure 135 is used to connect with other components or external components. The mounting structure 135 is provided on the support structure 132, and covers the insulation structure layer C10 and the fiber composite material layer C20 of the support structure 132.

[0646] The housing assembly 100 can be molded separately or integrally. In some examples, the support structure 132, the insulation structure layer C10, and the fiber composite material layer C20 are respectively hot-pressed using different molds, and then the molded support structure 132, insulation structure layer C10, and fiber composite material layer C20 are bonded and fixed together. In other examples, the support structure 132 is first made using a mold, and on the basis of the support structure 132, the first fiber fabric C11 is laid to form the insulation structure layer C10, and the second fiber fabric C21 is laid to form the fiber composite material layer C20. Then, the insulation structure layer C10 and the fiber composite material layer C20 are solidified on the support structure 132 by hot pressing or other methods, thereby integrally molding the housing assembly 100.

[0647] The battery device also includes components such as a sampling component 700 and a busbar 800. The sampling component 700 can be used to detect parameters such as voltage, current, and temperature of individual battery cells 210 or battery cell groups 200. The sampling component 700 includes an output component 710 that outputs data to an external controller. The busbar 800 can serve as a conductive component for electrically connecting multiple individual battery cells 210.

[0648] The battery assembly also includes composite pull plates 600, comprising a first pull plate 630 and a second pull plate 640. The main body 610 of the first pull plate 630 covers the battery cell array along the thickness direction of the first wall 120. The connecting portions 620 of the first pull plate 630 are located at both ends of the main body 610 along the first direction X, and are connected to the side of the beam member 134 away from the housing. There are two second pull plates 640, respectively disposed on both sides of the battery cell array parallel to the second direction Y. The main body 610 of the second pull plate 640 covers a corresponding plurality of battery cells 210 along the first direction X, and the connecting portions 620 of the second pull plate 640 are located at both ends of the main body 610 along the first direction X, and are connected to the beam member 134.

[0649] The composite sheet 600 has a second clearance notch 631 corresponding to the output component 710, and the beam component 134 has a clearance groove 1341 corresponding to the output component 710. The second clearance notch 631 and the clearance groove 1341 are used to avoid the output component 710 so that the output component 710 can be connected to an external controller. The composite sheet 600 includes a fourth fiber that extends along a first direction X. The fourth fiber includes one of glass fiber, basalt fiber, and aramid fiber.

[0650] In some specific embodiments, based on the aforementioned housing assembly 100, cover 500, battery cell array, and composite pull plate 600, the battery device further includes a protective assembly 300. The protective assembly 300 includes a protective plate 310, which forms a pressure relief cavity 320 with the first wall 120. An exhaust flow path 321 is formed in the pressure relief cavity 320, which connects to the through hole 121 and selectively connects to the external environment.

[0651] A pressure relief valve 330 is provided in the exhaust flow path 321. The pressure relief valve 330 has a preset pressure threshold. When the pressure in the pressure relief flow path is greater than the pressure threshold, the pressure relief valve 330 opens, and the exhaust flow path 321 is connected to the external environment to discharge the pressure relief airflow.

[0652] The housing assembly 100 also includes a protective film 150, which is disposed on the first wall 120 and used to cover the through hole 121. The protective film 150 is made of polyethylene terephthalate or the like. When the pressure relief section 211 of the battery cell 210 is ejected, the pressure relief airflow enters the pressure relief chamber 320 by breaking through the protective film 150.

[0653] In some specific embodiments, based on the aforementioned housing assembly 100, cover 500, battery cell array, and composite pull plate 600, the battery device further includes a protective assembly 300 and a heat absorption assembly 400. The protective assembly 300 includes a protective plate 310, which forms a pressure relief cavity 320 with the first wall 120. The heat absorption assembly 400 is disposed within the pressure relief cavity 320.

[0654] An exhaust flow path 321 is formed within the pressure relief chamber 320. The exhaust flow path 321 connects to the through hole 121 and selectively connects to the external environment. A pressure relief valve 330 is installed in the exhaust flow path 321. The pressure relief valve 330 has a preset pressure threshold. When the pressure in the pressure relief flow path exceeds the pressure threshold, the pressure relief valve 330 opens, and the exhaust flow path 321 connects to the external environment, allowing the pressure relief airflow to be discharged.

[0655] The heat-absorbing component 400 includes a phase change layer 410 and a thermally conductive layer 420. The thermally conductive layer 420 is at least disposed on the side of the phase change layer 410 near the first wall 120. The first phase change temperature of the phase change layer 410 ranges from 90°C to 150°C. The phase change layer 410 has good heat absorption performance within this temperature range. The thermally conductive layer 420 is used to quickly and evenly conduct heat to the phase change layer 410, thereby effectively controlling the heat generated by the battery cell 210.

[0656] The housing assembly 100 also includes a protective film 150, which is disposed on the first wall 120 and used to cover the through hole 121. The protective film 150 is made of polyethylene terephthalate or the like. When the pressure relief section 211 of the battery cell 210 is ejected, the pressure relief airflow breaks through the protective film 150 and enters the pressure relief chamber 320. The pressure relief airflow comes into contact with the heat-conducting layer 420 and quickly exchanges heat with it. The phase change layer 410 absorbs the heat from the heat-conducting layer 420, thereby reducing the pressure and temperature inside the pressure relief chamber.

[0657] In some specific embodiments, based on the aforementioned housing assembly 100, cover 500, battery cell array, and composite material pull plate 600, the battery device further includes a protective plate 310 and a current collector 340. The protective plate 310 connects to the housing assembly 100 and forms a wind-cooled chamber 350. The current collector 340 is located between the protective plate 310 and the first wall 120, and the current collector 340 forms a boss structure facing the first wall 120, thereby forming a current collection cavity 360 between the current collector 340 and the protective plate 310. The protective plate 310 has a first air passage 311 and a second air passage 312, which are connected to the corresponding current collection cavities 360. The current collection cavities 360 are connected to the wind-cooled chamber 350 through sub-flow ports 341 on the current collector 340.

[0658] The first air vent 311 and the second air vent 312 are respectively disposed on opposite sides of the protective plate 310. Alternatively, the first air vent 311 is disposed in the middle of the protective plate 310, and the second air vent 312 is disposed on the edge of the protective plate 310. The protective plate 310 is connected to the UAV cabin shell 900. The first air vent 311 / second air vent 312 are connected to the external environment through the corresponding connecting holes 121 of the cabin shell 900.

[0659] A first collector 340a and a second collector 340b are respectively provided corresponding to the first air outlet 311 and the second air outlet 312. The collection cavity 360 formed by the first collector 340a is connected to the first air outlet 311, and the collection cavity 360 formed by the second collector 340b is connected to the second air outlet 312. The heat exchange medium can be the airflow generated during the flight of the aircraft. The heat exchange medium enters the collection cavity 360 corresponding to the first collector 340a through the first air outlet 311. The heat exchange medium flows into the air-cooled chamber 350 through the sub-flow port 341 on the first current collector 340a. In the air-cooled chamber 350, the heat exchange medium exchanges heat with the first wall 120, and then exchanges heat with the battery cell 210. After exchanging heat, the heat exchange medium enters the current collection cavity 360 corresponding to the second current collector 340b through the sub-flow port 341 on the second current collector 340b, and flows to the external environment through the second air outlet 312, thereby achieving cooling and heat dissipation of the battery cell 210.

[0660] The manifold 340 includes a first extension structure 344 and a second extension structure 345. The first extension structure 344 extends along a second direction Y, and the second extension structure 345 extends along a first direction X. The first extension structure 344 is provided with a plurality of first sub-ports 3411, which are sequentially arranged along the second direction Y and offset from the first air outlet 311 / second air outlet 312. The second extension structure 345 is provided with a plurality of second sub-ports 3412, which are sequentially arranged along the first direction X on the corresponding second extension structure 345 and are opposite to the first air outlet 311 / second air outlet 312. The opening area of ​​the first sub-port 3411 is larger than the opening area of ​​the second sub-port 3412. The first sub-port 3411 is used for distributing the heat exchange medium, and the second sub-port 3412 is used to reduce the impact of the heat exchange medium on the manifold 340.

[0661] In some specific embodiments, based on the aforementioned housing assembly 100, cover 500, battery cell array, and composite pull plate 600, the battery device further includes a protective assembly 300. The protective assembly 300 includes a protective plate 310, which, together with the first wall 120, forms a wind-cooled chamber 350. A portion of the wind-cooled chamber 350 forms a pressure relief chamber 320, and another portion forms a wind-cooled channel. The wind-cooled channel is used for the flow of heat exchange medium. The protective assembly 300 also includes a separator 370, which isolates the pressure relief chamber 320 from the wind-cooled channel. The separator 370 can break in the event of thermal runaway of the battery cell 210, thereby connecting the pressure relief chamber 320 to the wind-cooled channel.

[0662] A pressure relief valve 330 is provided in the exhaust flow path 321. The pressure relief valve 330 has a preset pressure threshold. When the pressure in the pressure relief flow path is greater than the pressure threshold, the pressure relief valve 330 opens, and the exhaust flow path 321 is connected to the external environment to discharge the pressure relief airflow.

[0663] The housing assembly 100 also includes a protective film 150, which is disposed on the first wall 120 and used to cover the through hole 121. The protective film 150 is made of polyethylene terephthalate or the like. When the pressure relief section 211 of the battery cell 210 is ejected, the pressure relief airflow enters the pressure relief chamber 320 by breaking through the protective film 150.

[0664] The protective assembly 300 also includes a collector 340, which is located between the protective plate 310 and the first wall 120. The collector 340 forms a boss structure facing the first wall 120, thereby forming a collecting cavity 360 between the collector 340 and the protective plate 310. The protective plate 310 has a first air outlet 311 and a second air outlet 312, which are connected to the corresponding collecting cavities 360. The collecting cavities 360 are connected to the ventilation and cooling chamber 350 through sub-outlets 341 on the collector 340.

[0665] The first air vent 311 and the second air vent 312 are respectively disposed on opposite sides of the protective plate 310. Alternatively, the first air vent 311 is disposed in the middle of the protective plate 310, and the second air vent 312 is disposed on the edge of the protective plate 310. The protective plate 310 is connected to the UAV cabin shell 900. The first air vent 311 / second air vent 312 are connected to the external environment through the corresponding connecting holes 121 of the cabin shell 900.

[0666] A first collector 340a and a second collector 340b are respectively provided corresponding to the first air outlet 311 and the second air outlet 312. The collection cavity 360 formed by the first collector 340a is connected to the first air outlet 311, and the collection cavity 360 formed by the second collector 340b is connected to the second air outlet 312. The heat exchange medium can be the airflow generated during the flight of the aircraft. The heat exchange medium enters the collection cavity 360 corresponding to the first collector 340a through the first air outlet 311. The heat exchange medium flows into the air-cooled chamber 350 through the sub-flow port 341 on the first current collector 340a. In the air-cooled chamber 350, the heat exchange medium exchanges heat with the first wall 120, and then exchanges heat with the battery cell 210. After exchanging heat, the heat exchange medium enters the current collection cavity 360 corresponding to the second current collector 340b through the sub-flow port 341 on the second current collector 340b, and flows to the external environment through the second air outlet 312, thereby achieving cooling and heat dissipation of the battery cell 210.

[0667] The manifold 340 includes a first extension structure 344 and a second extension structure 345. The first extension structure 344 extends along a second direction Y, and the second extension structure 345 extends along a first direction X. The first extension structure 344 is provided with a plurality of first sub-ports 3411, which are sequentially arranged along the second direction Y and offset from the first air outlet 311 / second air outlet 312. The second extension structure 345 is provided with a plurality of second sub-ports 3412, which are sequentially arranged along the first direction X on the corresponding second extension structure 345 and are opposite to the first air outlet 311 / second air outlet 312. The opening area of ​​the first sub-port 3411 is larger than the opening area of ​​the second sub-port 3412. The first sub-port 3411 is used for distributing the heat exchange medium, and the second sub-port 3412 is used to reduce the impact of the heat exchange medium on the manifold 340.

[0668] In the event of thermal runaway in battery cell 210, the pressure relief airflow generated by battery cell 210 breaks through the protective membrane 150 and enters the pressure relief chamber 320 through the through hole 121. Under pressure, the pressure relief airflow in the pressure relief chamber 320 causes the separator 370 to break due to impact. The pressure relief airflow enters the air-cooled chamber 350 and enters the collector chamber 360 through the sub-flow port 341. It is then discharged to the external environment through the first air outlet 311 / second air outlet 312 connected to the collector chamber 360.

[0669] In some specific embodiments, based on the aforementioned housing assembly 100, cover 500, battery cell array, and composite material pull plate 600, the battery device further includes a protective assembly 300 and a heat-absorbing assembly 400. The protective assembly 300 includes a protective plate 310 and a current collector 340. The heat-absorbing assembly 400 is disposed between the protective plate 310 and the first wall 120, or the heat-absorbing assembly 400 is disposed between the current collector 340 and the first wall 120.

[0670] The protective plate 310 and the first wall 120 enclose each other to form a wind-cooled chamber 350. A part of the wind-cooled chamber 350 forms a pressure relief chamber 320, and another part forms a wind-cooled channel. The wind-cooled channel is used for the flow of heat exchange medium. The protective assembly 300 also includes a separator 370, which isolates the pressure relief chamber 320 from the wind-cooled channel. The separator 370 can break in the event of thermal runaway of the battery cell 210, thereby connecting the pressure relief chamber 320 to the wind-cooled channel.

[0671] The collector 340 is located between the protective plate 310 and the first wall 120. The collector 340 forms a boss structure facing the first wall 120, thereby forming a collection cavity 360 between the collector 340 and the protective plate 310. The protective plate 310 has a first air outlet 311 and a second air outlet 312, which are connected to the corresponding collection cavities 360. The collection cavity 360 is connected to the ventilation and cooling chamber 350 through the sub-outlets 341 on the collector 340.

[0672] The first air vent 311 and the second air vent 312 are respectively disposed on opposite sides of the protective plate 310. Alternatively, the first air vent 311 is disposed in the middle of the protective plate 310, and the second air vent 312 is disposed on the edge of the protective plate 310. The protective plate 310 is connected to the UAV cabin shell 900. The first air vent 311 / second air vent 312 are connected to the external environment through the corresponding connecting holes 121 of the cabin shell 900.

[0673] A first collector 340a and a second collector 340b are respectively provided corresponding to the first air outlet 311 and the second air outlet 312. The collection cavity 360 formed by the first collector 340a is connected to the first air outlet 311, and the collection cavity 360 formed by the second collector 340b is connected to the second air outlet 312. The heat exchange medium can be the airflow generated during the flight of the aircraft. The heat exchange medium enters the collection cavity 360 corresponding to the first collector 340a through the first air outlet 311. The heat exchange medium flows into the air-cooled chamber 350 through the sub-flow port 341 on the first current collector 340a. In the air-cooled chamber 350, the heat exchange medium exchanges heat with the first wall 120, and then exchanges heat with the battery cell 210. After exchanging heat, the heat exchange medium enters the current collection cavity 360 corresponding to the second current collector 340b through the sub-flow port 341 on the second current collector 340b, and flows to the external environment through the second air outlet 312, thereby achieving cooling and heat dissipation of the battery cell 210.

[0674] The manifold 340 includes a first extension structure 344 and a second extension structure 345. The first extension structure 344 extends along a second direction Y, and the second extension structure 345 extends along a first direction X. The first extension structure 344 is provided with a plurality of first sub-ports 3411, which are sequentially arranged along the second direction Y and offset from the first air outlet 311 / second air outlet 312. The second extension structure 345 is provided with a plurality of second sub-ports 3412, which are sequentially arranged along the first direction X on the corresponding second extension structure 345 and are opposite to the first air outlet 311 / second air outlet 312. The opening area of ​​the first sub-port 3411 is larger than the opening area of ​​the second sub-port 3412. The first sub-port 3411 is used for distributing the heat exchange medium, and the second sub-port 3412 is used to reduce the impact of the heat exchange medium on the manifold 340.

[0675] An exhaust flow path 321 is formed inside the pressure relief chamber 320. The exhaust flow path 321 is connected to the through hole 121. A pressure relief valve 330 is installed in the exhaust flow path 321. The pressure relief valve 330 has a preset pressure threshold. When the pressure in the pressure relief flow path is greater than the pressure threshold, the pressure relief valve 330 opens, and the exhaust flow path 321 is connected to the external environment to discharge the pressure relief airflow.

[0676] A heat-absorbing component 400 is disposed within the pressure relief chamber 320. The heat-absorbing component 400 includes a phase change layer 410 and a thermally conductive layer 420. The thermally conductive layer 420 is disposed at least on the side of the phase change layer 410 closest to the first wall 120. The first phase change temperature of the phase change layer 410 ranges from 90°C to 150°C. The phase change layer 410 exhibits good heat absorption within this temperature range. The thermally conductive layer 420 is used to rapidly and evenly conduct heat to the phase change layer 410, thereby effectively controlling the heat generated by the battery cell 210.

[0677] The housing assembly 100 also includes a protective film 150, which is disposed on the first wall 120 and used to cover the through hole 121. The protective film 150 is made of polyethylene terephthalate or the like. When the pressure relief section 211 of the battery cell 210 is ejected, the pressure relief airflow enters the pressure relief chamber 320 by breaking through the protective film 150.

[0678] In the event of thermal runaway in battery cell 210, the pressure relief airflow generated by battery cell 210 breaks through the protective film 150 and enters the pressure relief chamber 320 through the through hole 121. The pressure relief airflow comes into contact with the heat-conducting layer 420 and quickly exchanges heat with the heat-conducting layer 420. The phase change layer 410 absorbs the heat from the heat-conducting layer 420, thereby reducing the pressure and temperature inside the pressure relief chamber and controlling the pressure relief airflow in the pressure relief chamber 320 within a suitable pressure range. If the pressure relief airflow in the pressure relief chamber 320 still has a high pressure, the high-pressure pressure relief airflow will impact and break the separator 370. The pressure relief airflow enters the air-cooled chamber 350 and enters the collector chamber 360 through the sub-flow port 341. It is then discharged to the external environment through the first air outlet 311 / second air outlet 312 connected to the collector chamber 360.

[0679] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of this application's specification. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the application documents.

Claims

1. A battery device, characterized in that, include: A housing assembly having a receiving cavity, the housing assembly including a first wall; a battery cell, the battery cell being housed within the receiving cavity and supported by the first wall; wherein the first wall includes a stacked insulating structural layer and a fiber composite material layer, the insulating structural layer being located between the fiber composite material layer and the battery cell along the thickness direction of the first wall.

2. The battery device according to claim 1, characterized in that, The housing assembly also includes multiple sidewalls, the first wall and the multiple sidewalls defining the receiving cavity; the sidewalls include a stacked insulating structural layer and a fiber composite material layer, at least a portion of the insulating structural layer being located between the fiber composite material layer and the battery cell.

3. The battery device according to claim 2, characterized in that, The sidewall is configured as a hollow structure with a hollow cavity; the hollow cavity is located between the insulating structure layer and the fiber composite material layer of the first sidewall.

4. The battery device according to claim 3, characterized in that, The sidewall also includes a support structure located in the hollow cavity and abutting against at least one of the insulating structure layer and the fiber composite material layer of the sidewall.

5. The battery device according to claim 4, characterized in that, The support structure includes a connecting layer and a first support body, wherein the connecting layer at least partially covers the first support body.

6. The battery device according to claim 5, characterized in that, The connecting layer includes a fiber-reinforced composite material layer; the first support includes a foam layer.

7. The battery device according to claim 5 or 6, characterized in that, The plurality of sidewalls includes two side plate members, the battery device includes a battery cell group, the battery cell group includes a plurality of battery cells stacked along a first direction, the two side plate members are disposed at opposite ends of the first wall along a second direction, the second direction intersects the first direction, at least a portion of the insulating structure layer forms the wall surface of the side plate member facing the receiving cavity, the fiber composite material layer forms the wall surface of the side plate member away from the receiving cavity, the connecting layer is located between the first support and the insulating structure layer, and / or, the connecting layer is located between the first support and the fiber composite material layer.

8. The battery device according to any one of claims 4 to 7, characterized in that, The support structure includes a second support body, the second support body including a support plate having a support surface facing the insulating structure layer, the battery device including a battery cell group including a plurality of battery cells stacked along a first direction, the first direction being the thickness direction of the support plate, along the first direction, the support surface of the support plate abutting against the insulating structure layer.

9. The battery device according to claim 8, characterized in that, The second support also includes an extension plate connected to the support plate. The extension plate is connected to the side of the support plate facing the battery cell and extends along a first direction. Along the thickness direction of the first wall, the extension plate is located between the insulating structure layer and the fiber composite material layer of the first wall and projects onto the same projection plane along the thickness direction of the first wall. The projection of the extension plate overlaps with the projection of at least a portion of the battery cell.

10. The battery device according to claim 9, characterized in that, The battery cell has a pressure relief section, and the battery cell is arranged such that the pressure relief port of the pressure relief section faces the first wall. The first wall has a through hole at a position corresponding to the pressure relief section. The extension plate has a first clearance notch and is projected onto the same projection plane along the thickness direction of the first wall. The projection of the pressure relief port of the pressure relief section is located within the projection of the first clearance notch and within the projection of the through hole.

11. The battery device according to claim 8, characterized in that, The second support also includes a support rib connected to the support plate. Along the first direction, the support rib is located on the side of the support plate opposite to the battery cell assembly, and the support rib extends along the thickness direction of the support plate.

12. The battery device according to claim 8, characterized in that, The support structure further includes a third support body located between the support plate and the fiber composite material layer, the third support body including a foam layer; or, the third support body is configured as a fiber composite material shell with an opening at at least one end, the opening facing the support plate.

13. The battery device according to any one of claims 8 to 12, characterized in that, The plurality of sidewalls include two side plate members and two beam members. A first support is provided in the hollow cavity of the side plate member, and at least a second support is provided in the hollow cavity of the beam member. The two beam members are connected to the two opposite ends of the first wall along the first direction, and the two side plate members are connected to the two opposite ends of the first wall along the second direction. Adjacent side plate members are connected to the beam members. The first direction and the second direction intersect each other and both intersect the thickness direction of the first wall. The battery device includes a battery cell group, and the battery cell group includes a plurality of battery cells stacked along the first direction.

14. The battery device according to any one of claims 8 to 13, characterized in that, The supporting structure is equipped with a mounting structure.

15. The battery device according to any one of claims 2 to 14, characterized in that, A portion of the insulating structure layer of the sidewall is configured as a flange, which is connected to the fiber composite material layer to form a connection structure.

16. The battery device according to claim 15, characterized in that, The connecting structure is located at the end of the sidewall opposite to the first wall along the thickness direction of the first wall, or the connecting structure is located on the side of the sidewall opposite to the receiving cavity along the thickness direction of the sidewall.

17. The battery device according to claim 15 or 16, characterized in that, In the connection structure, the flanged portion overlaps with the fiber composite material layer, or the flanged portion is butt-jointed with the fiber composite material layer.

18. The battery device according to claim 17, characterized in that, The housing assembly further includes an overlap layer, in which the flanged portion is mated to the fiber composite material layer, and the overlap layer at least covers the mating seam between the flanged portion and the fiber composite material layer.

19. The battery device according to any one of claims 1 to 18, characterized in that, The insulating structure layer includes a first fiber fabric, and the fiber composite material layer includes a second fiber fabric. The first fiber fabric includes multiple first fibers, and the second fiber fabric includes multiple second fibers. The first fibers are different from the second fibers.

20. The battery device according to claim 19, characterized in that, The density of the second fiber is less than that of the first fiber.

21. The battery device according to claim 19, characterized in that, The first fiber includes at least one of glass fiber, basalt fiber, and aramid fiber; and / or the second fiber includes at least one of carbon fiber and polyethylene fiber.

22. The battery device according to claim 21, characterized in that, The first fiber is glass fiber, and the second fiber is carbon fiber.

23. The battery device according to any one of claims 19 to 22, characterized in that, The number of layers of the first fiber fabric in the insulating structure layer is less than or equal to the number of layers of the second fiber fabric in the fiber composite material layer.

24. The battery device according to any one of claims 19 to 23, characterized in that, The number of layers of the first fiber fabric in the insulating structure layer is 1-3; and / or, the number of layers of the second fiber fabric in the fiber composite material layer is 2-15.

25. The battery device according to claim 19, characterized in that, The first fiber is a continuous fiber, and at least a portion of the plurality of first fibers intersect each other; and / or, the second fiber is a continuous fiber, and at least a portion of the plurality of second fibers intersect each other.

26. The battery device according to any one of claims 1 to 25, characterized in that, The insulating structural layer includes a first substrate and a plurality of first fibers, wherein the first fibers are continuous fibers and at least a portion of the plurality of first fibers intersect each other; the first substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; the first fibers include at least one of glass fiber, basalt fiber, and aramid fiber; and / or, the fiber composite material layer includes a second substrate and a plurality of second fibers, wherein the second fibers are continuous fibers and at least a portion of the plurality of second fibers intersect each other; the second substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin; the second fibers include at least one of carbon fiber and polyethylene fiber.

27. The battery device according to any one of claims 1 to 26, characterized in that, The thickness of the insulating structure layer is less than or equal to the thickness of the fiber composite material layer; and / or, the thickness of the insulating structure layer is in the range of 0.1 mm to 1.0 mm, and the thickness of the fiber composite material layer is in the range of 1.0 mm to 2.5 mm.

28. The battery device according to any one of claims 19 to 27, characterized in that, The first wall further includes a reinforcing layer, which is stacked between the insulating structure layer and the fiber composite material layer. The reinforcing layer includes a fiber-reinforced composite material layer, which includes a third substrate and a third fiber. The third substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin. The third fiber includes at least one of carbon fiber and polyethylene fiber.

29. The battery device according to any one of claims 1 to 28, characterized in that, The thickness of the first wall is in the range of 1.3 mm to 2.4 mm.

30. The battery device according to any one of claims 1 to 29, characterized in that, The battery cell has a pressure relief section, and the battery cell is arranged such that the pressure relief port of the pressure relief section faces the first wall. The first wall has a through hole that penetrates the first wall and is projected on the same projection plane along the thickness direction of the first wall. The projection of the pressure relief port is located within the projection of the through hole.

31. The battery device according to claim 30, characterized in that, The battery device also includes a protective film disposed on the first wall and covering the through hole.

32. The battery device according to claim 30 or 31, characterized in that, The battery device further includes a protective plate disposed on the side of the first wall opposite to the receiving cavity. A pressure relief cavity is formed between the protective plate and the first wall, and the pressure relief cavity communicates with the through hole.

33. The battery device according to claim 32, characterized in that, The pressure relief chamber is selectively connected to the external environment.

34. The battery device according to claim 32 or 33, characterized in that, An exhaust flow path is formed in the pressure relief chamber, and the housing assembly also includes a pressure relief valve. The exhaust flow path is connected to the pressure relief valve, and the pressure relief valve is configured to open under the action of gas pressure in the exhaust flow path. When the pressure relief valve is open, the exhaust flow path is connected to the external environment.

35. The battery device according to any one of claims 32 to 34, characterized in that, The battery device further includes a heat-absorbing component, which is disposed in the pressure relief chamber and is positioned opposite to the pressure relief portion of the battery cell.

36. The battery device according to claim 35, characterized in that, The heat-absorbing component includes at least a phase change layer made of a phase change material, wherein the first phase change temperature of the phase change material is in the range of 90°C to 150°C.

37. The battery device according to claim 36, characterized in that, The heat-absorbing component also includes a heat-conducting layer, which is stacked with the phase change layer. Along the stacking direction, the heat-conducting layer is located at least on the side of the phase change layer closest to the pressure relief section.

38. The battery device according to any one of claims 1 to 37, characterized in that, The battery device further includes a protective component, which is disposed on the side of the first wall opposite to the receiving cavity. A wind-cooled chamber is formed between the protective component and the first wall. The protective component is provided with a first air outlet and a second air outlet communicating with the wind-cooled chamber.

39. The battery device according to claim 38, characterized in that, The protective assembly includes a protective plate and a flow collector. The protective plate is provided with a first air outlet and a second air outlet. The flow collector is disposed between the protective plate and the first wall, and forms a flow collection cavity between the protective plate and the protective plate. The flow collector is provided with a sub-flow outlet, which connects the air-cooled chamber and the flow collection cavity.

40. The battery device according to claim 39, characterized in that, The current collector has a boss structure. The current collector includes a connected abutment and a protrusion. The abutment abuts against the protective plate. The protrusion protrudes away from the protective plate and towards the air-cooled chamber to form the boss structure. The current collection cavity is formed between the protrusion and the protective plate. The sub-flow outlet is located on the protrusion and opens towards the air-cooled chamber.

41. The battery device according to claim 39 or 40, characterized in that, The sub-flow port includes a first sub-flow port, which is projected onto the same projection plane along the thickness direction of the first wall. The projection of the first sub-flow port does not overlap with the projection of the first air vent and the projection of the second air vent.

42. The battery device according to claim 41, characterized in that, The sub-flow port also includes a second sub-flow port, the opening area of ​​each first sub-flow port is larger than the opening area of ​​each second sub-flow port, and the second sub-flow port is arranged opposite to the first air outlet or the second air outlet.

43. The battery device according to any one of claims 40 to 42, characterized in that, The battery cell has a pressure relief section, and the battery cell is arranged such that the pressure relief port of the pressure relief section faces the air-cooled chamber. The battery device also includes a heat absorption component, which is disposed in the air-cooled chamber and is disposed on the protective plate opposite to the pressure relief section of the battery cell.

44. The battery device according to claim 43, characterized in that, The heat-absorbing component includes at least a phase change layer made of a phase change material, wherein the first phase change temperature of the phase change material is in the range of 90°C to 150°C.

45. The battery device according to claim 44, characterized in that, The heat-absorbing component also includes a heat-conducting layer, which is stacked with the phase change layer. Along the stacking direction, the heat-conducting layer is located at least on the side of the phase change layer closest to the pressure relief section.

46. ​​The battery device according to any one of claims 43 to 45, characterized in that, A partition is provided between the first wall and the protective plate, the partition abutting against the first wall and the protective plate respectively to define a pressure relief chamber, and the heat absorption assembly is located in the pressure relief chamber. The separator is configured to break in the event of thermal runaway of the battery cell, thereby connecting the pressure relief chamber with the current collection chamber.

47. The battery device according to claim 46, characterized in that, The battery cell has a pressure relief section, and the battery cell is arranged such that the pressure relief port of the pressure relief section faces the air-cooled chamber. The battery device also includes a heat absorption component, which is disposed in the air-cooled chamber and disposed on the current collector opposite to the pressure relief section of the battery cell.

48. The battery device according to claim 32 or 39, characterized in that, The protective plate comprises a laminated structure formed by layers of fiber-reinforced composite materials.

49. The battery device according to any one of claims 38 to 47, characterized in that, The protective component is connected to the first wall, and the connection has a sealing structure.

50. The battery device according to any one of claims 1 to 49, characterized in that, The battery device further includes a cover connected to the housing assembly to enclose the receiving cavity; the cover includes a stacked insulating structural layer and a fiber composite material layer, with the insulating structural layer located between the fiber composite material layer and the battery cell.

51. The battery device according to claim 50, characterized in that, The housing assembly also includes multiple sidewalls, the first wall and the multiple sidewalls defining the receiving cavity, and the end face of the sidewall opposite to the first wall along the thickness direction of the first wall is sealed to the cover.

52. The battery device according to any one of claims 1 to 51, characterized in that, The battery cell is a plurality of cells, which are arranged in a battery cell row along a first direction; the housing assembly also includes a plurality of side walls, the first wall and the plurality of side walls defining the receiving cavity, the side walls also include beam members disposed opposite to each other along the first direction, the battery device also includes a composite material tension plate, the composite material tension plate includes a main body and a connecting part, the connecting part is connected to the main body and located at both ends of the main body along the first direction, and the connecting part is connected to the beam member.

53. The battery device according to claim 52, characterized in that, The composite pull plate includes at least one first pull plate that extends along the first direction and covers at least a portion of the side of the battery cell array opposite to the first wall.

54. The battery device according to claim 52 or 53, characterized in that, The composite pull plate also includes at least one second pull plate, which extends along the first direction and covers at least a portion of the side of the battery cell array.

55. The battery device according to claim 54, characterized in that, Multiple battery cells are arranged along a second direction to form a battery cell array, with the second direction intersecting the first direction; there are at least two second pull plates, which cover both sides of the battery cell array in the first direction.

56. The battery device according to any one of claims 52 to 55, characterized in that, The composite sheet includes a fourth substrate and a fourth fiber. The fourth fiber is a continuous fiber and its extension direction is consistent with the first direction. The fourth fiber includes at least one of glass fiber, basalt fiber, and aramid fiber. The fourth substrate includes at least one of polyurethane, epoxy resin, phenolic resin, polyamide resin, and ceramizable resin.

57. The battery device according to claim 53, characterized in that, The battery device further includes a sampling component located between the first pull plate and the battery cell array. The sampling component has at least one output component. The first pull plate is provided with a second clearance notch, which is positioned corresponding to the output component.

58. The battery device according to claim 57, characterized in that, The beam member has at least one clearance groove, and the output member is at least partially located within the clearance groove.

59. The battery device according to claim 53, 57, or 58, characterized in that, The battery device further includes a busbar, which is located between the battery cell array and the first pull plate, and the first pull plate is bonded to the busbar.

60. The battery device according to any one of claims 1 to 59, characterized in that, The insulating structure layer includes an insulating coating, which is selected from at least one of epoxy coating, silicone coating, polyurethane coating, fluorocarbon coating, silica coating, boron nitride coating, and vinyl resin coating.

61. A housing assembly, characterized in that, include: The housing wall defines a receiving cavity, the housing assembly includes a first wall, the receiving cavity is used to accommodate a single battery cell, and the first wall includes a stacked insulating structure layer and a fiber composite material layer; When the cavity contains a battery cell, the battery cell is supported by the first wall, and along the thickness direction of the first wall, the insulating structure layer is located between the fiber composite material layer and the battery cell.

62. An electrical appliance, characterized in that, Includes a battery device according to any one of claims 1 to 60 for providing electrical energy; or includes a plurality of battery cells and a housing assembly according to claim 61 for accommodating the plurality of battery cells.

63. The electrical equipment according to claim 62, characterized in that, The electrical equipment includes aircraft.

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