Battery device and electric device

Abstract

The application discloses a battery device and an electric device. The battery device comprises a battery cell, a plurality of thermal management assemblies and a current collection assembly. The plurality of thermal management assemblies are arranged along a first direction, and the battery cell is arranged between two adjacent thermal management assemblies. The thermal management assembly comprises a first film bag, and the first film bag has a first flow channel for containing a fluid to adjust the temperature of the battery cell. The current collection assembly comprises a second film bag, and the second film bag has a second flow channel. The current collection assembly is connected to the plurality of thermal management assemblies, and the second flow channel is communicated with the plurality of first flow channels. The technical scheme provided by the application can effectively improve the structural reliability of the battery device and reduce the manufacturing cost of the battery device.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery device and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the development of battery technology, how to improve the structural reliability of battery devices and how to reduce the manufacturing cost of battery devices are technical problems that urgently need to be solved. Utility Model Content

[0004] This application provides a battery device and an electrical device. The technical solution provided by this application can effectively improve the structural reliability of the battery device and reduce the manufacturing cost of the battery device.

[0005] This application is achieved through the following technical solution: In a first aspect, some embodiments of this application provide a battery device, including a battery cell, a thermal management component, and a current collector component. The thermal management components are multiple, arranged along a first direction, with a battery cell disposed between adjacent thermal management components. Each thermal management component includes a first membrane bag having a first flow channel for containing fluid to regulate the temperature of the battery cell. The current collector component includes a second membrane bag having a second flow channel; the current collector component connects to the multiple thermal management components, and the second flow channel communicates with the multiple first flow channels.

[0006] In the above scheme, the first membrane bag is used as at least part of the thermal management component to regulate the temperature of the battery cell, and the second membrane bag is used as at least part of the current collector component to collect the flow channels in multiple thermal management components, so that the fluid is concentratedly output or input into the battery device. On the one hand, it can reduce the manufacturing difficulty and overall quality of the thermal management component and the current collector component, thereby reducing the manufacturing cost of the battery device and improving the energy density of the battery device. On the other hand, by utilizing the flexibility of the membrane bags (the first membrane bag and the second membrane bag), it can adapt to the deformation of the battery cell during the charge and discharge cycle expansion throughout its entire life cycle, thereby reducing the risk of breakage at the connection between the thermal management component and the current collector component due to the expansion force.

[0007] According to some embodiments of this application, the first flow channel includes an inlet, an outlet, and multiple sub-flow channels, which are sequentially connected. The inlet is connected to the first sub-flow channel, and the outlet is connected to the last sub-flow channel. The sub-flow channels extend along a second direction, and the multiple sub-flow channels are arranged along a third direction, with the first direction, the second direction, and the third direction being perpendicular to each other.

[0008] In the above scheme, multiple sub-channels connected in sequence are arranged along a third direction, so that the fluid enters multiple sub-channels through the inlet and flows in a repetitive and tortuous manner, and is finally discharged from the outlet. This can increase the heat exchange path of the fluid, improve the heat exchange efficiency of the thermal management components to the battery cells, and help improve the reliability of the battery device.

[0009] According to some embodiments of this application, along a first direction, the first membrane bag includes a first wall and a second wall disposed opposite to each other. The side of the first wall facing away from the second wall has a recess, which extends along a second direction. The regions of the first wall corresponding to the recess are connected to the second wall. There are multiple recesses, arranged along a third direction, with sub-channels located between adjacent recesses.

[0010] In the above scheme, a portion of the first wall of the first membrane bag is connected to a portion of the second wall so that the first membrane bag is partially recessed, thereby dividing the interior of the first membrane bag into multiple sub-channels. On the one hand, this can reduce the manufacturing difficulty of the first membrane bag and reduce the risk of the battery device's mass energy density being affected by additional partitions inside the first membrane bag to separate multiple sub-channels. On the other hand, it can effectively increase the heat exchange path of the fluid, improve the heat exchange efficiency of the thermal management components to the battery cells, and help improve the reliability of the battery device.

[0011] According to some embodiments of this application, the inlet and outlet are located on the same side of the first film bag along the second direction; or, the inlet and outlet are located on opposite sides of the first film bag along the second direction.

[0012] In the above scheme, by placing the inlet and outlet on the same side of the first membrane bag along the second direction, the space wastage of the battery device in the second direction can be reduced, which is beneficial to improving the volumetric energy density of the battery device. By placing the inlet and outlet on opposite sides of the first membrane bag along the second direction, the space on the side of the first membrane bag is sufficient to facilitate the installation between the current collector and the inlet or outlet, which is beneficial to improving the manufacturing efficiency of the battery device.

[0013] According to some embodiments of this application, the thermal management assembly further includes a constraint member connected to the first membrane bag and located on at least one side of the first membrane bag along a first direction.

[0014] In the above solution, by providing a constraint member on at least one side of the first membrane bag along the first direction, the overall structural strength of the thermal management component can be improved, enabling the thermal management component to effectively support the first flow channel; on the other hand, it can effectively constrain the expansion of the battery cell, reduce the risk of battery cell failure due to expansion, and make the battery device have high reliability.

[0015] According to some embodiments of this application, along a first direction, the first membrane bag has a first wall and a second wall disposed opposite to each other, the side of the first wall away from the second wall having a recess, and at least a portion of the constraint member being located in the recess.

[0016] In the above scheme, the side of the first wall away from the second wall has a recess, and at least part of the constraint member is located in the recess. On the one hand, this can increase the connection area between the constraint member and the first membrane bag, reducing the risk of the constraint member falling off the first membrane bag; on the other hand, it can enable at least part of the constraint member to utilize the space formed by the recess, so that the constraint member and the first membrane bag share the internal space of the battery device, which is beneficial to improving the volumetric energy density of the battery device.

[0017] According to some embodiments of this application, there are multiple recesses, which are arranged along a third direction. The first wall has a connecting area, which is located between two adjacent recesses. The constraint member includes a body and multiple protrusions. The body extends along a third direction and connects to the multiple protrusions, which are arranged along a third direction. The body is connected to the connecting area, and the protrusions correspond one-to-one with the recesses, with the protrusions located in the corresponding recesses.

[0018] In the above scheme, the first membrane bag is provided with a plurality of recesses arranged at intervals along a third direction. The constraint member includes a body and a plurality of protrusions. The protrusions correspond to the recesses and are disposed in the corresponding recesses. The body is connected to the connection area between two adjacent recesses, which can effectively increase the connection area between the constraint member and the first membrane bag, so that the constraint member and the first membrane bag have a stable connection relationship, which is conducive to improving the structural reliability of the battery device.

[0019] According to some embodiments of this application, there are multiple constraint members, which are arranged at intervals along a second direction, with the first and second directions being perpendicular to each other.

[0020] In the above scheme, by setting multiple constraint members, and the multiple constraint members are spaced apart along the second direction, the overall structural strength of the thermal management component can be improved, and the first flow channel in the first membrane bag can be effectively supported so that the fluid in the first flow channel can effectively regulate the temperature of the battery cell.

[0021] According to some embodiments of this application, the thermal management component includes multiple connecting portions, including a first connecting portion and a second connecting portion. The first connecting portion and the second connecting portion are respectively connected to a first membrane bag, and the first connecting portion is connected to the inlet of a first flow channel, and the second connecting portion is connected to the outlet of the first flow channel. The current collection component includes multiple mating portions, all of which are connected to a second membrane bag and are connected to the second flow channel. The number of current collection components is multiple, including a first current collection component and a second current collection component. The mating portion of the first current collection component is inserted into the first connecting portion, and the mating portion of the second current collection component is inserted into the second connecting portion.

[0022] In the above scheme, the first connecting part of the thermal management component is connected to the inlet of the first flow channel, and the second connecting part is connected to the outlet of the first flow channel. The mating part of the first current collector component is inserted into the first connecting part, and the mating part of the second current collector component is inserted into the second connecting part. On the one hand, this allows the fluid in the first current collector component to enter multiple thermal management components through the mating part and the first connecting part, thereby regulating the temperature of the individual battery cells. Furthermore, the flow channels in the multiple thermal management components converge at the second current collector component through the second connecting part and the mating part inserted into it, achieving concentrated fluid entry and exit, which is beneficial for improving thermal management efficiency. On the other hand, by setting the connecting part and the mating part to be in a plug-in relationship, the installation difficulty of the current collector component and the thermal management component can be reduced, which is beneficial for improving the manufacturing efficiency of the battery device.

[0023] According to some embodiments of this application, the connecting part and the first membrane bag are integrally structured; and / or the mating part and the second membrane bag are integrally structured.

[0024] In the above solutions, by making the connecting part and the first membrane bag an integral structure, the structural stability of the connecting part and the first membrane bag is high, reducing the risk of the connecting part deforming under stress due to the expansion of the battery cell and detaching from the first membrane bag. Similarly, by making the mating part and the second membrane bag an integral structure, the structural stability of the mating part and the second membrane bag is high, reducing the risk of the mating part deforming under stress due to the expansion of the battery cell and detaching from the second membrane bag.

[0025] According to some embodiments of this application, the connecting part includes a bellows, and / or the mating part includes a bellows.

[0026] In the above solution, by setting at least one of the connecting part and the mating part to include a bellows, the connection between the connecting part and the mating part is redundant, which can adapt to the stress changes caused by the expansion of the battery cell or the vibration of the battery device by external force, reduce the risk of connection failure of the connecting part and the mating part due to stress, and make the battery device highly reliable.

[0027] According to some embodiments of this application, a thermal management component is located on one side of the current collector component along a second direction. The current collector component extends along a first direction, and the first and second directions are perpendicular to each other. A plurality of mating parts are arranged at intervals along the first direction. The second membrane bag includes a body region and a buffer zone arranged along the first direction. There are multiple body regions, and the mating parts are connected to the body regions. The buffer zone is located between two adjacent body regions.

[0028] In the above scheme, as the number of charge-discharge cycles increases, the battery cells expand, and the expansion along the first direction is relatively large. By setting a buffer in the second membrane bag, the buffer can adapt to the expansion of the battery cells along the first direction and deform accordingly. This reduces the risk of deformation and detachment failure of the connection and mating parts due to the tensile stress caused by the expansion of the battery cells, making the connection and mating parts more stable and improving the reliability of the battery device.

[0029] According to some embodiments of this application, along a first direction, there are multiple battery cells between adjacent thermal management components, and the multiple battery cells are arranged along a second direction, with the first direction and the second direction being perpendicular to each other; along the second direction, a first current collector and a second current collector are located on the same side of the multiple battery cells; or, along the second direction, the multiple battery cells are located between the first current collector and the second current collector.

[0030] In the above scheme, by placing the first current collector and the second current collector on the same side of multiple battery cells along the second direction, the space wastage in the second direction of the battery device can be reduced, which is beneficial to improving the volumetric energy density of the battery device. By placing the first current collector and the second current collector on opposite sides of multiple battery cells along the second direction, sufficient space is provided on the sides of the multiple battery cells to facilitate the installation between the current collector and the thermal management component, which is beneficial to improving the manufacturing efficiency of the battery device.

[0031] According to some embodiments of this application, the first membrane bag includes a first insulating layer, a first metal layer and a second insulating layer, the first metal layer being located between the first insulating layer and the second insulating layer, and the second insulating layer enclosing to form a first flow channel; and / or the second membrane bag includes a third insulating layer, a second metal layer and a fourth insulating layer, the second metal layer being located between the third insulating layer and the fourth insulating layer, and the fourth insulating layer enclosing to form a second flow channel.

[0032] In the above scheme, the first membrane bag includes a first insulating layer, a first metal layer, and a second insulating layer, with the first metal layer located between the first and second insulating layers. This effectively reduces the risk of fluid leakage, thereby effectively regulating the temperature of the battery cells and ensuring high reliability of the battery device. Furthermore, it provides insulation between the battery cells and the first membrane bag, reducing the risk of internal short circuits in the battery device and further enhancing its reliability. The second membrane bag includes a third insulating layer, a second metal layer, and a fourth insulating layer, with the second metal layer located between the third and fourth insulating layers. This also effectively reduces the risk of fluid leakage, thereby effectively regulating the temperature of the battery cells and ensuring high reliability of the battery device. Additionally, it provides insulation between the battery cells and the second membrane bag, reducing the risk of internal short circuits in the battery device and further enhancing its reliability.

[0033] According to some embodiments of this application, the first film bag includes an aluminum-plastic film; and / or, the second film bag includes an aluminum-plastic film.

[0034] In the above scheme, the first membrane bag includes an aluminum-plastic film. This reduces the material cost of the battery device, decreases its weight, and increases its energy density. Furthermore, the flexibility of the aluminum-plastic film adapts to the deformation caused by the expansion of individual battery cells during charge-discharge cycles, thus reducing the risk of breakage at the connection between the thermal management component and the current collector due to expansion forces, resulting in high battery device reliability. The second membrane bag also includes an aluminum-plastic film. This again reduces the material cost of the battery device, decreases its weight, and increases its energy density. Finally, the flexibility of the aluminum-plastic film adapts to the deformation caused by the expansion of individual battery cells during charge-discharge cycles, thus reducing the risk of breakage at the connection between the thermal management component and the current collector due to expansion forces, resulting in high battery device reliability.

[0035] Secondly, some embodiments of this application provide an electrical device, including the battery device provided in the first aspect.

[0036] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 A schematic diagram of a vehicle provided for some embodiments of this application; Figure 2 This is a perspective view of a battery device provided in some embodiments of this application; Figure 3 An exploded perspective view of a battery device provided in some embodiments of this application; Figure 4 This is a schematic diagram of the internal structure of a battery device provided in some embodiments of this application; Figure 5 This is a schematic diagram of the structure of a battery cell, thermal management component, and current collector component provided in some embodiments of this application; Figure 6 An exploded perspective view of a battery cell, thermal management assembly, and current collector assembly provided in some embodiments of this application; Figure 7 This is a schematic diagram of the structure of a thermal management component provided in some embodiments of this application; Figure 8 This is a schematic diagram of the internal structure of a first membrane bag provided in some embodiments of this application; Figure 9 for Figure 8 Enlarged view of point A in the middle; Figure 10 for Figure 7 Enlarged view of point B in the middle; Figure 11 This is a schematic diagram of the structure of a current collection component provided in some embodiments of this application; Figure 12 for Figure 7 Enlarged view of point C in the middle; Figure 13 for Figure 11 Enlarged view at point D; Figure 14 The diagram shows the structure of the first insulating layer, the first metal layer, and the second insulating layer provided in some embodiments of this application.

[0039] Icons: 1000 - Vehicle; 100 - Battery Unit; 200 - Controller; 300 - Motor; 10 - Battery Cell; 20 - Housing; 21 - First Housing Section; 22 - Second Housing Section; 30 - Thermal Management Component; 31 - First Membrane Bag; 310 - First Wall; 311 - Second Wall; 312 - Recess; 313 - Connection Area; 32 - Constraint; 320 - Body; 321 - Protrusion; 33 - First Flow Channel; 330 - Inlet; 331 - Outlet; 332 - Sub- Flow channel; 34-Connecting part; 340-First connecting part; 341-Second connecting part; 40-Current collector assembly; 41-Second membrane bag; 410-Body area; 411-Buffer zone; 42-Second flow channel; 43-Matching part; 40a-First current collector assembly; 40b-Second current collector assembly; 44-First conduit; 45-Second conduit; 50-First insulating layer; 51-First metal layer; 52-Second insulating layer; x-First direction; y-Second direction; z-Third direction. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0042] In this application, the reference to "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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] 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, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0045] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0046] In this application, "multiple" means two or more (including two).

[0047] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0048] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0049] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0050] As an example, a 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, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0051] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0052] 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.

[0053] 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.

[0054] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0055] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0056] As an example, the enclosure may include a first enclosure section and a second enclosure section. The first enclosure section and the second enclosure section are fastened together to form a closed space inside the enclosure for housing the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure section may be a top cover or a bottom plate.

[0057] 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.

[0058] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0059] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. The energy storage device includes energy storage containers, energy storage cabinets, etc. In some embodiments, one or more energy storage devices may constitute at least part of an energy storage system.

[0060] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, and discharge capacity. Furthermore, the manufacturing cost of battery devices must also be taken into account.

[0061] To maintain the battery cells at a suitable temperature and reduce the risk of thermal runaway, the battery device also includes thermal management components and current collectors. The thermal management components are stacked with the battery cells to regulate the battery temperature. Multiple thermal management components are present, each with a flow channel to contain fluid. Current collectors are connected to multiple thermal management components, allowing fluid to either enter each component individually or drain from multiple components in a concentrated manner.

[0062] In related technologies, thermal management components include water-cooled plates made of aluminum alloy, and current collector components include current collectors made of aluminum alloy. However, water-cooled plates and current collectors made of aluminum alloy have problems such as complex structure, excessive overall weight, and high material cost, which affect the manufacturing cost and energy density of battery devices.

[0063] In view of this, to reduce the manufacturing cost of the battery device and improve its mass energy density, some embodiments of this application provide a battery device including a battery cell, a thermal management component, and a current collector component. Multiple thermal management components are arranged along a first direction, with a battery cell disposed between adjacent thermal management components. Each thermal management component includes a first membrane bag having a first flow channel for containing fluid to regulate the temperature of the battery cell. The current collector component includes a second membrane bag having a second flow channel. The current collector component connects to the multiple thermal management components, and the second flow channel communicates with the multiple first flow channels.

[0064] In the above scheme, the first membrane bag is used as at least part of the thermal management component to regulate the temperature of the battery cell, and the second membrane bag is used as at least part of the current collector component to collect the flow channels in multiple thermal management components. This allows the fluid to be concentratedly output or input into the battery device. On the one hand, it can reduce the manufacturing difficulty and overall quality of the thermal management component and the current collector component, thereby reducing the manufacturing cost of the battery device and improving the energy density of the battery device. On the other hand, by utilizing the flexibility of the membrane bags (the first membrane bag and the second membrane bag), it can adapt to the deformation of the battery cell during the charge and discharge cycle expansion throughout its entire life cycle, thereby reducing the risk of breakage at the connection between the thermal management component and the current collector component due to the expansion force, resulting in high reliability of the battery device.

[0065] The technical solutions described in the embodiments of this application are applicable to battery devices, energy storage devices using battery devices, and electrical devices.

[0066] The battery devices described in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft.

[0067] Energy storage devices may include energy storage containers, energy storage cabinets, etc. For example, an energy storage cabinet may include a cabinet and one or more battery cells and / or battery devices mounted on the cabinet.

[0068] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be new energy vehicles, including pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The electrical devices in the embodiments of this application include, but are not limited to, those mentioned above.

[0069] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0070] Figure 1 This is a schematic diagram of a vehicle 1000 provided in some embodiments of this application.

[0071] The electrical device is a vehicle 1000. Inside the vehicle 1000, a controller 200, a motor 300, and a battery device 100 can be installed. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be installed at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, it can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1000.

[0072] Some embodiments of this application provide a battery device 100; please refer to [link to relevant documentation]. Figures 2-6 , Figure 2 This is a perspective view of a battery device 100 provided in some embodiments of this application. Figure 3 This is an exploded perspective view of a battery device 100 provided in some embodiments of this application. Figure 4 This is a schematic diagram of the internal structure of the battery device 100 provided in some embodiments of this application. Figure 5 This is a schematic diagram of the structure of the battery cell 10, thermal management component 30, and current collector component 40 provided in some embodiments of this application. Figure 6 An exploded perspective view of a battery cell 10, a thermal management assembly 30, and a current collector 40 provided in some embodiments of this application.

[0073] The battery device 100 includes a battery cell 10, a thermal management assembly 30, and a current collector assembly 40. Multiple thermal management assemblies 30 are arranged along a first direction x, with a battery cell 10 positioned between adjacent thermal management assemblies 30. Each thermal management assembly 30 includes a first membrane pouch 31 with a first flow channel 33 for containing fluid to regulate the temperature of the battery cell 10. The current collector assembly 40 includes a second membrane pouch 41 with a second flow channel 42. The current collector assembly 40 connects to the multiple thermal management assemblies 30, and the second flow channel 42 connects to the multiple first flow channels 33.

[0074] The battery device 100 includes multiple battery cells 10. Figure 3 For example, the battery device 100 includes multiple rows of battery cells 10, which are arranged along a first direction x. Each row of battery cells 10 includes multiple battery cells 10 arranged along a second direction y. The battery cells 10 can be square or cylindrical. Taking a square battery cell 10 as an example, in a row of battery cells 10, the large face of each battery cell 10 is perpendicular to the first direction x.

[0075] In some embodiments, the battery device 100 includes a housing 20 in which a plurality of battery cells 10 are housed. Optionally, a thermal management assembly 30 is located within the housing 20.

[0076] The housing 20 provides an assembly space for the battery cell 10, and the housing 20 can adopt various structures. In some embodiments, the housing 20 may include a first housing portion 21 and a second housing portion 22, which overlap each other, and together define an assembly space for accommodating the battery cell 10. The second housing portion 22 may be a hollow structure open at one end, and the first housing portion 21 may be a plate-like structure, with the first housing portion 21 covering the open side of the second housing portion 22 so that the first housing portion 21 and the second housing portion 22 together define the assembly space; alternatively, the first housing portion 21 and the second housing portion 22 may both be hollow structures open on one side, with the open side of the first housing portion 21 covering the open side of the second housing portion 22. In some embodiments, the thermal management component 30 may be part or all of the second housing portion 22.

[0077] Of course, the box 20 formed by the first box part 21 and the second box part 22 can be of various shapes, such as cylinder, cuboid or cube.

[0078] In the battery device 100, there can be multiple battery cells 10 disposed within the housing 20. When there are multiple battery cells 10 disposed within the housing 20, the multiple battery cells 10 can be connected in series, in parallel, or in a mixed manner. A mixed connection means that the multiple battery cells 10 are connected in both series and parallel. The multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed manner, and then the whole assembly of the multiple battery cells 10 is housed within the housing 20. Of course, the battery device 100 can also be formed by first connecting multiple battery cells 10 in series, in parallel, or in a mixed manner to form a battery cell 10 assembly, and then connecting the multiple battery cell 10 assemblies in series, in parallel, or in a mixed manner to form a whole assembly, which is then housed within the housing 20.

[0079] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for connecting multiple battery cells 10 to achieve electrical connection between the multiple battery cells 10.

[0080] Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited to these.

[0081] The thermal management assembly 30 is a component used to regulate the temperature of the battery cell 10. There are multiple thermal management assemblies 30, arranged along a first direction x, with a battery cell 10 between adjacent thermal management assemblies 30. For example, please refer to... Figure 3 Along the first direction x, there is a row of battery cells 10 between two adjacent thermal management components 30.

[0082] The thermal management component 30 includes a first membrane bag 31, which is a bag-shaped structure. In some embodiments, the first membrane bag 31 may be a bag-shaped structure formed by enclosing a membrane substrate. The material of the membrane substrate of the first membrane bag 31 includes, but is not limited to, polymer materials or materials composed of polymers and metals. For example, taking aluminum-plastic film as an example, the aluminum-plastic film is a three-layer composite structure, with an outer layer including a nylon layer, a middle layer including an aluminum foil layer, and an inner layer including a polypropylene layer. The aluminum-plastic film is folded and rolled into a bag-shaped structure, and the polypropylene layer is heated and melted to bond it to form the first membrane bag 31.

[0083] The first membrane bag 31 has a first flow channel 33, which is used to contain fluid. The fluid can be a gas, such as air or hydrogen, or a liquid, such as water, salt water solution or liquid nitrogen.

[0084] At least a portion of the manifold 40 may be located within the housing 20. The manifold 40 is used to connect multiple thermal management components 30. The manifold 40 includes a second membrane bag 41 with a second flow channel 42. The second flow channel 42 communicates with multiple first flow channels 33 of the multiple thermal management components 30, and is used to deliver fluid to the multiple thermal management components 30 or collect the fluid in the multiple thermal management components 30. Exemplarily, there are multiple manifolds 40, including a first manifold 40a and a second manifold 40b. The first manifold 40a is used for fluid entry and is connected to a fluid storage device. Fluid in the fluid storage device flows into the multiple first flow channels 33 of the multiple thermal management components 30 through the first manifold 40a. The second manifold 40b is used for fluid discharge. After the fluid in the multiple first flow channels 33 of the multiple thermal management components 30 converges in the second manifold 40b, it is discharged into the fluid storage device by the second manifold 40b, realizing fluid circulation.

[0085] The second membrane bag 41 is a bag-shaped structure formed by enclosing a membrane substrate. The membrane substrate of the second membrane bag 41 is made of materials including, but not limited to, polymer materials or materials composed of polymers and metals. For example, taking aluminum-plastic film as an example, the aluminum-plastic film is a three-layer composite structure, with an outer layer including a nylon layer, a middle layer including an aluminum foil layer, and an inner layer including a polypropylene layer. The aluminum-plastic film is folded and enclosed to form a bag-shaped structure, and the polypropylene layer is heated and melted to form the second membrane bag 41.

[0086] In the above scheme, the first membrane bag 31 is used as at least part of the thermal management component 30 to regulate the temperature of the battery cell 10, and the second membrane bag 41 is used as at least part of the current collector component to collect the flow channels in the multiple thermal management components 30, so that the fluid is concentratedly output or input into the battery device 100. On the one hand, it can reduce the manufacturing difficulty and overall quality of the thermal management component 30 and the current collector component 40, thereby reducing the manufacturing cost of the battery device 100 and improving the mass energy density of the battery device 100. On the other hand, by utilizing the flexibility of the membrane bags (first membrane bag 31 and second membrane bag 41), it can adapt to the deformation of the battery cell 10 during the charge and discharge cycle expansion throughout its entire life cycle, thereby reducing the risk of breakage at the connection between the thermal management component 30 and the current collector component due to the expansion force.

[0087] According to some embodiments of this application, please refer to Figure 7 , Figure 7 This is a schematic diagram of the structure of a thermal management component 30 provided in some embodiments of this application. The first flow channel 33 includes an inlet 330, an outlet 331, and multiple sub-flow channels 332, which are sequentially connected. The inlet 330 is connected to the first sub-flow channel 332, and the outlet 331 is connected to the last sub-flow channel 332. The sub-flow channels 332 extend along a second direction y, and the multiple sub-flow channels 332 are arranged along a third direction z, with the first direction x, the second direction y, and the third direction z being perpendicular to each other.

[0088] The first flow channel 33 includes an inlet 330 and an outlet 331. The inlet 330 is used for fluid to enter the first flow channel 33, and the outlet 331 is used for fluid to exit the first flow channel 33. Exemplarily, the inlet 330 is connected to a first manifold assembly 40a, and the outlet 331 is connected to a second manifold assembly 40b.

[0089] The first flow channel 33 includes multiple sub-flow channels 332, each extending along a second direction y, and the multiple sub-flow channels 332 discharging along a third direction z. Along the third direction z, the multiple sub-flow channels 332 are sequentially connected. The first sub-flow channel 332 is connected to the inlet 330, and the last sub-flow channel 332 is connected to the outlet 331, making the fluid flow path in the first flow channel 33 S-shaped (in...). Figure 7 (The direction of fluid flow is indicated by arrows). For example, along the second direction y, one end of the first sub-channel 332 is connected to the inlet 330, the other end of the first sub-channel 332 is connected to the second sub-channel 332, the end of the second sub-channel 332 away from the first sub-channel 332 is connected to the third sub-channel 332, and so on, with one end of the last sub-channel 332 along the second direction y connected to the previous sub-channel 332, and the other end of the last sub-channel 332 along the second direction y connected to the outlet 331.

[0090] In the above scheme, the multiple sub-channels 332 connected in sequence are arranged along the third direction z, so that the fluid enters the multiple sub-channels 332 through the inlet 330 and flows in a repetitive and tortuous manner and is finally discharged from the outlet 331. This can increase the heat exchange path of the fluid, improve the heat exchange efficiency of the thermal management component 30 to the battery cell 10, and help improve the reliability of the battery device 100.

[0091] According to some embodiments of this application, please refer to Figure 8 and Figure 9 , Figure 8 This is a schematic diagram of the internal structure of the first membrane bag 31 provided in some embodiments of this application. Figure 9 for Figure 8 Enlarged view of point A in the middle.

[0092] Along the first direction x, the first membrane bag 31 includes a first wall 310 and a second wall 311 disposed opposite to each other. The side of the first wall 310 facing away from the second wall 311 has a recess 312, which extends along the second direction y. The area of ​​the first wall 310 corresponding to the recess 312 is connected to the second wall 311. There are multiple recesses 312, which are arranged along the third direction z. The sub-channel 332 is located between two adjacent recesses 312.

[0093] Along the first direction x, the first membrane bag 31 includes opposing first walls 310 and second walls 311, and a first flow channel 33 may be located between the first walls 310 and the second walls 311. Along the first direction x, the side of the first wall 310 opposite to the second wall 311 is partially recessed to form a recess 312, and the recess 312 extends along the second direction y (see [link to relevant documentation]). Figure 7 The area corresponding to the first wall 310 and the recess 312 is connected to the second wall 311, which corresponds to the recess 312, to divide the internal space of the first membrane bag 31 into at least two sub-channels 332.

[0094] Please see Figure 7 The number of recesses 312 is multiple, and the multiple recesses 312 are arranged at intervals along the third direction z to divide the interior of the first membrane bag 31 into multiple sub-channels 332, such that a sub-channel 332 is located between two adjacent recesses 312.

[0095] For example, the membrane substrate of the first membrane bag 31 includes an aluminum-plastic film, and the first wall 310 and the second wall 311 are partially connected to each other by thermoplasticizing to form a recess 312.

[0096] In the above scheme, a portion of the first wall 310 of the first membrane bag 31 is connected to a portion of the second wall 311 so that the first membrane bag 31 is partially recessed into a recess 312, thereby dividing the interior of the first membrane bag 31 into multiple sub-channels 332. On the one hand, this can reduce the manufacturing difficulty of the first membrane bag 31 and reduce the risk that the mass energy density of the battery device 100 will be affected by additional partitions inside the first membrane bag 31 to separate multiple sub-channels 332. On the other hand, it can effectively increase the heat exchange path of the fluid, improve the heat exchange efficiency of the thermal management component 30 to the battery cell 10, and improve the reliability of the battery device 100.

[0097] In some other embodiments, a separator can be provided within the first membrane bag 31 to divide the first flow channel 33 into multiple sub-flow channels 332. The separator can be a plastic part, which can be connected to the wall of the first membrane bag 31 by means of bonding, thermal bonding, or other methods. Thermal bonding can be understood as the plastic part and the first membrane bag 31 being connected to each other by heating.

[0098] According to some embodiments of this application, the inlet 330 and the outlet 331 are located on the same side of the first membrane bag 31 along the second direction y; or, the inlet 330 and the outlet 331 are located on opposite sides of the first membrane bag 31 along the second direction y.

[0099] In some embodiments, see Figure 7 The inlet 330 and outlet 331 of the first flow channel 33 are located on the same side of the first membrane bag 31 along the second direction y. Taking the location of the inlet 330 and outlet 331 as the first orientation side of the first membrane bag 31 as an example, the fluid enters the interior of the first membrane bag 31 through the inlet 330 from the first orientation side. After exchanging heat with the battery cell 10, the fluid is discharged from the first membrane bag 31 through the outlet 331 from the first orientation side.

[0100] In other embodiments, the inlet 330 and outlet 331 of the first flow channel 33 are located on opposite sides of the first membrane bag 31 along the second direction y. Taking the location of the inlet 330 as the first orientation side of the first membrane bag 31 and the location of the outlet 331 as the second orientation side of the first membrane bag 31 as an example, the fluid enters the interior of the first membrane bag 31 from the first orientation side through the inlet 330, and after exchanging heat with the battery cell 10, the fluid is discharged from the first membrane bag 31 from the second orientation side through the outlet 331.

[0101] In the above scheme, by placing the inlet 330 and outlet 331 on the same side of the first membrane bag 31 along the second direction y, the space wastage of the battery device 100 in the second direction y can be reduced, which is beneficial to improving the volumetric energy density of the battery device 100. By placing the inlet 330 and outlet 331 on opposite sides of the first membrane bag 31 along the second direction y, the space on the side of the first membrane bag 31 is sufficient to facilitate the installation between the current collector 40 and the inlet 330 or outlet 331, which is beneficial to improving the manufacturing efficiency of the battery device 100.

[0102] According to some embodiments of this application, please refer to Figures 7-10 , Figure 10 for Figure 7 Enlarged view at point B. The thermal management assembly 30 also includes a constraint member 32, which is connected to the first membrane bag 31 and is located on at least one side of the first membrane bag 31 along the first direction x.

[0103] The constraint member 32 is a structural component connected to the first membrane bag 31. The material of the constraint member 32 includes, but is not limited to, metallic materials such as aluminum, aluminum alloy, copper, copper alloy, and stainless steel, as well as non-metallic materials such as ceramic and rubber. For example, the material of the constraint member 32 includes rubber.

[0104] The connection between the constraint member 32 and the first membrane bag 31 includes, but is not limited to, bonding, snap-fitting, riveting, and thermal bonding. Thermal bonding can be understood as the constraint member 32 and the first membrane bag 31 being connected to each other by heating.

[0105] The number of constraint members 32 is at least one. When the number of constraint members 32 is one, the constraint member 32 can be disposed on one side of the first film bag 31 along the first direction x. When the number of constraint members 32 is multiple, the multiple constraint members 32 can be located on opposite sides of the first film bag 31 along the first direction x, or the multiple constraint members 32 can be located on the same side of the first film bag 31 along the first direction x.

[0106] In the above scheme, by providing a constraint member 32 on at least one side of the first membrane bag 31 along the first direction x, the overall structural strength of the thermal management component 30 can be improved, so that the thermal management component 30 can effectively support the first flow channel 33; on the other hand, it can effectively constrain the expansion of the battery cell 10, reduce the risk of the battery cell 10 failing due to expansion, and make the battery device 100 have high reliability.

[0107] According to some embodiments of this application, please refer to Figures 7-10 Along the first direction x, the first film bag 31 has a first wall 310 and a second wall 311 disposed opposite to each other. The side of the first wall 310 away from the second wall 311 has a recess 312, and at least a portion of the constraint member 32 is located in the recess 312.

[0108] The first membrane bag 31 has a first wall 310 and a second wall 311 opposite each other along a first direction x, and a first flow channel 33 is located between the first wall 310 and the second wall 311. A constraint member 32 is located on the side of the first wall 310 opposite to the second wall 311, and the side of the first wall 310 opposite to the second wall 311 has a recess 312, at least a portion of the constraint member 32 is located in the recess 312.

[0109] In some embodiments, the region of the first wall 310 corresponding to the recess 312 is connected to the second wall 311, and the region where the first wall 310 and the second wall 311 are connected divides the interior of the first flow channel 33 into a plurality of sub-flow channels 332. Exemplarily, the membrane substrate of the first film bag 31 is an aluminum-plastic film, and the aluminum-plastic film is thermoformed to form a plurality of sub-flow channels 332. The thermoformed portion forms a recess 312, and part or all of the restraint member 32 is located in the recess 312.

[0110] In the above scheme, the side of the first wall 310 away from the second wall 311 has a recess 312, and at least a portion of the constraint member 32 is located in the recess 312. On the one hand, this can increase the connection area between the constraint member 32 and the first membrane bag 31, reducing the risk of the constraint member 32 falling off the first membrane bag 31. On the other hand, it can enable at least a portion of the constraint member 32 to utilize the space formed by the recess 312, so that the constraint member 32 and the first membrane bag 31 share the internal space of the battery device 100, which is beneficial to improving the volumetric energy density of the battery device 100.

[0111] According to some embodiments of this application, please refer to Figure 7 and Figure 10 The number of recesses 312 is multiple, and the multiple recesses 312 are arranged along the third direction z. The first wall 310 has a connecting area 313, which is located between two adjacent recesses 312. The constraint member 32 includes a body 320 and multiple protrusions 321. The body 320 extends along the third direction z and connects to the multiple protrusions 321. The multiple protrusions 321 are arranged along the third direction z. The body 320 is connected to the connecting area 313. The protrusions 321 correspond one-to-one with the recesses 312 and the protrusions 321 are located in the corresponding recesses 312.

[0112] Each recess 312 may extend along the second direction y, and multiple recesses 312 are arranged at intervals along the third direction z. Sub-channels 332 are located between two adjacent recesses 312. The first wall 310 has a connecting region 313, which is located between two adjacent recesses 312.

[0113] The constraint member 32 includes a body 320 and a plurality of protrusions 321. The body 320 extends along a third direction z. The protrusions 321 are connected to the side of the body 320 along a first direction x and facing the constraint member 32. The plurality of protrusions 321 are arranged at intervals along the third direction z. Each protrusion 321 corresponds to a recess 312. Each protrusion 321 is located in the corresponding recess 312. The body 320 is connected to the connection area 313.

[0114] In the above scheme, the first membrane bag 31 is provided with a plurality of recesses 312 arranged at intervals along the third direction z. The constraint member 32 includes a body 320 and a plurality of protrusions 321. The protrusions 321 correspond to the recesses 312 and are disposed in the corresponding recesses 312. The body 320 is connected to the connection area 313 between two adjacent recesses 312, which can effectively increase the connection area between the constraint member 32 and the first membrane bag 31, so that the constraint member 32 and the first membrane bag 31 have a stable connection relationship, which is beneficial to improving the structural reliability of the battery device 100. The constraint member 32 includes a body 320 and a plurality of protrusions 321. The plurality of protrusions 321 are respectively disposed in the corresponding recesses 312. Two adjacent protrusions 321 and the body 320 can support the sub-flow channel 332 located between two adjacent protrusions 321, improve the structural stability of the sub-flow channel 332, and facilitate the stable flow of fluid in the first flow channel 33.

[0115] According to some embodiments of this application, there are multiple constraint members 32, and the multiple constraint members 32 are arranged at intervals along the second direction y, with the first direction x and the second direction y being perpendicular to each other.

[0116] Please see Figure 7 The number of constraint members 32 is multiple, and the multiple constraint members 32 are arranged at intervals along the second direction y.

[0117] In the above scheme, by setting multiple constraint members 32 and the multiple constraint members 32 are spaced apart along the second direction y, the overall structural strength of the thermal management component 30 can be improved, and the first flow channel 33 in the first membrane bag 31 can be effectively supported so that the fluid in the first flow channel 33 can effectively regulate the temperature of the battery cell 10.

[0118] According to some embodiments of this application, please refer to Figures 11-13 , Figure 11 This is a schematic diagram of the structure of the current collection component 40 provided in some embodiments of this application. Figure 12 for Figure 7 Enlarged view at point C in the middle. Figure 13 for Figure 11 Enlarged view of point D in the middle.

[0119] The thermal management component 30 includes multiple connecting portions 34, each including a first connecting portion 340 and a second connecting portion 341. The first connecting portion 340 and the second connecting portion 341 are respectively connected to the first membrane bag 31, and the first connecting portion 340 is connected to the inlet 330 of the first flow channel 33, and the second connecting portion 341 is connected to the outlet 331 of the first flow channel 33. The current collection component 40 includes multiple mating portions 43, each of which is connected to the second membrane bag 41 and is connected to the second flow channel 42. The current collection component 40 is multiple in number, including a first current collection component 40a and a second current collection component 40b. The mating portion 43 of the first current collection component 40a is inserted into the first connecting portion 340, and the mating portion 43 of the second current collection component 40b is inserted into the second connecting portion 341.

[0120] The thermal management assembly 30 includes a connecting portion 34, which is connected to the first flow channel 33. The connecting portion 34 is used to engage with the mating portion 43 of the current collection assembly 40, so that the first flow channel 33 and the second flow channel 42 are connected. The engagement can be understood as applying an external force toward the mating portion 43 to the connecting portion 34, so that at least a portion of the connecting portion 34 and the mating portion 43 are inserted into the mating relationship of the other.

[0121] The thermal management assembly 30 includes a first connection portion 340 and a second connection portion 341. The first connection portion 340 communicates with the inlet 330 of the first flow channel 33, allowing fluid to enter the first flow channel 33 from the second flow channel 42. The second connection portion 341 communicates with the outlet 331 of the first flow channel 33, allowing fluid to enter the second flow channel 42 from the first flow channel 33.

[0122] The current collection assembly 40 includes a mating part 43, which is connected to the second flow channel 42. The mating part 43 is used to insert and engage with the connecting part 34 of the thermal management assembly 30, so that the second flow channel 42 is connected to the first flow channel 33.

[0123] In some embodiments, the battery device 100 includes a first current collector 40a and a second current collector 40b. The first current collector 40a is used for fluid inlet, and the second current collector 40b is used for fluid outlet. The first current collector 40a has a plurality of mating portions 43, the number of which corresponds one-to-one with the number of thermal management components 30. The mating portions 43 of the first current collector 40a are inserted into the first connecting portions 340 of the corresponding thermal management components 30. The second current collector 40b has a plurality of mating portions 43, the number of which corresponds one-to-one with the number of thermal management components 30. The mating portions 43 of the second current collector 40b are inserted into the second connecting portions 341 of the corresponding thermal management components 30.

[0124] In the above scheme, the first connecting part 340 of the thermal management component 30 is connected to the inlet 330 of the first flow channel 33, and the second connecting part 341 is connected to the outlet 331 of the first flow channel 33. The mating part 43 of the first current collector 40a is inserted into the first connecting part 340, and the mating part 43 of the second current collector 40b is inserted into the second connecting part 341. On the one hand, the fluid in the first current collector 40a can enter the multiple thermal management components 30 through the mating part 43 and the first connecting part 340 to regulate the temperature of the battery cell 10 respectively. The flow channels in the multiple thermal management components 30 converge into the second current collector through the second connecting part 341 and the mating part 43 inserted into the second connecting part 341, realizing the concentrated entry and exit of the fluid, which is beneficial to improving the thermal management efficiency. On the other hand, by setting the connecting part 34 and the mating part 43 to be in an inserted-fit relationship, the installation difficulty of the current collector 40 and the thermal management component 30 can be reduced, which is beneficial to improving the manufacturing efficiency of the battery device 100.

[0125] According to some embodiments of this application, the connecting part 34 and the first membrane bag 31 are integrally formed; and / or the mating part 43 and the second membrane bag 41 are integrally formed.

[0126] In some embodiments, the connecting part 34 and the first film bag 31 are an integral structure, and the two can be integrally formed by 3D printing, injection molding, or other methods. For example, the film substrate of the first film bag 31 is an aluminum-plastic film, and the connecting part 34 can be connected to the first film bag 31 by thermoplasticizing.

[0127] In some embodiments, the mating part 43 and the second film bag 41 are an integral structure, and the two can be integrally formed by 3D printing, injection molding, or other methods. For example, the film substrate of the second film bag 41 is an aluminum-plastic film, and the mating part 43 can be connected to the second film bag 41 by thermoplasticizing.

[0128] In the above solution, by making the connecting part 34 and the first membrane bag 31 an integral structure, the structural stability of the connecting part 34 and the first membrane bag 31 is high, reducing the risk that the connecting part 34 may detach from the first membrane bag 31 due to deformation caused by the expansion of the battery cell 10. Similarly, by making the mating part 43 and the second membrane bag 41 an integral structure, the structural stability of the mating part 43 and the second membrane bag 41 is high, reducing the risk that the mating part 43 may detach from the second membrane bag due to deformation caused by the expansion of the battery cell 10.

[0129] According to some embodiments of this application, the connecting part 34 includes a bellows, and / or the mating part 43 includes a bellows.

[0130] In some embodiments, the corrugated portion 34 can be understood as including a corrugated folded portion. The corrugated folded portion of the connecting portion 34 is inserted and engaged with the mating portion 43. The corrugated folded portion of the connecting portion 34 can absorb external impacts and reduce the risk of the connecting portion 34 and the mating portion 43 falling off each other due to external impacts.

[0131] In some embodiments, the corrugated part 43 can be understood as including a corrugated folded portion, the connecting part 34 and the corrugated part 43 are inserted and fitted together, and the corrugated folded portion of the connecting part 43 can absorb external impacts and reduce the risk of the connecting part 34 and the connecting part 43 falling off each other due to external impacts.

[0132] In some embodiments, at least a portion of the wall of the connecting portion 34 is corrugated and folded in the direction of insertion of the connecting portion 34 and the mating portion 43 (e.g., the second direction y, in which at least a portion of the wall of the connecting portion 34 is folded to each other so that it can be stretched along the second direction y when subjected to external force, and can deform to a certain extent in the direction perpendicular to the second direction y). At least a portion of the wall of the mating portion 43 is corrugated and folded in the direction of insertion of the connecting portion 34 and the mating portion 43 (e.g., the second direction y, in which at least a portion of the wall of the mating portion 43 is folded to each other so that it can be stretched along the second direction y when subjected to external force, and can deform to a certain extent in the direction perpendicular to the second direction y).

[0133] In some embodiments, the connecting portion 34 may include an interference-fit corrugated tube opening (female opening) injected into the first film bag 31, and the mating portion 43 may include an interference-fit corrugated tube opening (female opening) injected into the second film bag 41, with the connecting portion 34 inserted into the mating portion 43.

[0134] In the above solution, by setting at least one of the connecting part 34 and the mating part 43 to include a bellows, the connection between the connecting part 34 and the mating part 43 can be redundant, adapting to the stress changes caused by the expansion of the battery cell 10 or the vibration of the battery device 100 by external force, reducing the risk of connection failure of the connecting part 34 and the mating part 43 due to stress, and making the battery device 100 highly reliable.

[0135] According to some embodiments of this application, please refer to Figure 3 and Figure 13 The thermal management component 30 is located on one side of the current collector component 40 along the second direction y. The current collector component 40 extends along the first direction x, and the first direction x and the second direction y are perpendicular to each other. A plurality of mating parts 43 are arranged at intervals along the first direction x. The second membrane bag 41 includes a body region 410 and a buffer zone 411 arranged along the first direction x. There are multiple body regions 410. The mating parts 43 are connected to the body regions 410, and the buffer zone 411 is located between two adjacent body regions 410.

[0136] A thermal management component 30 extends along a second direction y, and multiple thermal management components 30 are located on one side of the current collector 40 along the second direction y, and the multiple thermal management components 30 are arranged along a first direction x. A second membrane bag 41 of the current collector 40 extends along the first direction x, and multiple mating portions 43 on the second membrane bag 41 are arranged at intervals along the first direction x.

[0137] The second membrane bag 41 includes a body region 410 and a buffer zone 411. There are multiple body regions 410, which are arranged along the first direction x. The buffer zone 411 is located between two adjacent body regions 410. The mating part 43 is connected to the body region 410.

[0138] The buffer zone 411 can be understood as a region used to buffer the deformation of the second membrane bag 41 under external force. For example, please refer to... Figure 13 The second membrane bag 41 has a third wall and a fourth wall opposite each other along the second direction y. The third wall has corrugated folded regions, which include alternating peaks and troughs along the second direction y. The fourth wall also has corrugated folded regions, which include alternating peaks and troughs along the second direction y. The corrugated folded regions of the third and fourth walls are positioned correspondingly and together form a buffer zone 411. When the second membrane bag 41 is subjected to an external force, the corrugated folded regions of the third and fourth walls can deform, allowing the second membrane bag 41 to be stretched or contracted along the second direction y.

[0139] In the above scheme, as the number of charge-discharge cycles increases, the battery cell 10 expands, and the expansion along the first direction x is relatively large. By providing a buffer zone 411 in the second membrane bag 41, the buffer zone 411 deforms to adapt to the expansion of the battery cell 10 along the first direction x, reducing the risk of deformation and detachment failure of the connecting part 34 and the mating part 43 due to the tensile stress generated by the expansion of the battery cell 10. This makes the connection between the connecting part 34 and the mating part 43 stable, which is beneficial to improving the reliability of the battery device 100.

[0140] According to some embodiments of this application, along the first direction x, there are multiple battery cells 10 between adjacent thermal management components 30, and the multiple battery cells 10 are arranged along the second direction y, with the first direction x and the second direction y being perpendicular to each other; along the second direction y, the first current collector 40a and the second current collector 40b are located on the same side of the multiple battery cells 10; or, along the second direction y, the multiple battery cells 10 are located between the first current collector 40a and the second current collector 40b.

[0141] Please see Figure 3Along the first direction x, there is at least one row of battery cells 10 between two adjacent thermal management components 30, the row of battery cells 10 including a plurality of battery cells 10 arranged along the second direction y.

[0142] In some embodiments, along the second direction y, the first current collector 40a and the second current collector 40b are located on the same side of the at least one row of battery cells 10, and the first current collector 40a and the second current collector 40b can be arranged along the third direction z.

[0143] In other embodiments, along the second direction y, the first current collector 40a and the second current collector 40b may be located on opposite sides of the at least one row of battery cells 10.

[0144] In some embodiments where the first current collector 40a and the second current collector 40b are located on the same side of the at least one row of battery cells 10 along the second direction y, the first conduit 44 of the first current collector 40a and the second conduit 45 of the second current collector 40b may be disposed on the same wall of the housing 20. The first conduit 44 of the first current collector 40a may be connected to a fluid storage device, and the second conduit 45 of the second current collector 40b may be connected to a fluid storage device.

[0145] In the above scheme, by placing the first current collector 40a and the second current collector 40b on the same side of the plurality of battery cells 10 along the second direction y, the space wastage of the battery device 100 in the second direction y can be reduced, which is beneficial to improving the volumetric energy density of the battery device 100. By placing the first current collector 40a and the second current collector 40b on opposite sides of the plurality of battery cells 10 along the second direction y, sufficient space is provided on the sides of the plurality of battery cells 10 to facilitate the installation between the current collector 40 and the thermal management component 30, which is beneficial to improving the manufacturing efficiency of the battery device 100.

[0146] According to some embodiments of this application, please refer to Figure 14 , Figure 14 The diagram illustrates the structure of a first insulating layer 50, a first metal layer 51, and a second insulating layer 52 provided in some embodiments of this application. A first film bag 31 includes a first insulating layer 50, a first metal layer 51, and a second insulating layer 52. The first metal layer 51 is located between the first insulating layer 50 and the second insulating layer 52, and the second insulating layer 52 encloses and forms a first flow channel 33; and / or a second film bag 41 includes a third insulating layer, a second metal layer, and a fourth insulating layer. The second metal layer is located between the third insulating layer and the fourth insulating layer, and the fourth insulating layer encloses and forms a second flow channel 42.

[0147] In some embodiments, the film-like substrate of the first film bag 31 can be a multilayer composite structure, including a first insulating layer 50, a second insulating layer 52, and a first metal layer 51 disposed between the first insulating layer 50 and the second insulating layer 52. The first insulating layer 50 includes, but is not limited to, a nylon layer, a polyester film layer, a biaxially oriented polypropylene layer, a polyethylene layer, etc. The second insulating layer 52 includes, but is not limited to, a cast polypropylene layer, a biaxially oriented polypropylene layer, a polyethylene layer, etc. The first metal layer 51 includes, but is not limited to, aluminum foil, stainless steel foil, copper foil, etc.

[0148] In some embodiments, the first insulating layer 50, the first metal layer 51 and the second insulating layer 52 are compositely formed into a film substrate, the film substrate is folded and enclosed to form a first flow channel 33, and the second insulating layer 52 is sealed by thermoplastic or other means to form a first film bag 31.

[0149] In some embodiments, the film-like substrate of the second film bag 41 can be a multilayer composite structure, including a third insulating layer, a fourth insulating layer, and a second metal layer disposed between the third insulating layer and the fourth insulating layer. The third insulating layer includes, but is not limited to, a nylon layer, a polyester film layer, a biaxially oriented polypropylene layer, a polyethylene layer, etc. The fourth insulating layer includes, but is not limited to, a cast polypropylene layer, a biaxially oriented polypropylene layer, a polyethylene layer, etc. The second metal layer includes, but is not limited to, aluminum foil, stainless steel foil, copper foil, etc.

[0150] In some embodiments, the third insulating layer, the second metal layer and the fourth insulating layer are composited to form a film substrate, the film substrate is folded and enclosed to form a second flow channel 42, and the fourth insulating layer is sealed by thermoplastic or other means to form a second film bag 41.

[0151] In the above scheme, the first membrane bag 31 includes a first insulating layer 50, a first metal layer 51, and a second insulating layer 52, with the first metal layer 51 located between the first insulating layer 50 and the second insulating layer 52. This effectively reduces the risk of fluid leakage, thereby effectively regulating the temperature of the battery cell 10 and ensuring high reliability of the battery device 100. Furthermore, it provides insulation between the battery cell 10 and the first membrane bag 31, reducing the risk of internal short circuits in the battery device 100 and further enhancing its reliability. The second membrane bag 41 includes a third insulating layer, a second metal layer, and a fourth insulating layer, with the second metal layer located between the third and fourth insulating layers. This also effectively reduces the risk of fluid leakage, thereby effectively regulating the temperature of the battery cell 10 and ensuring high reliability of the battery device 100. Additionally, it provides insulation between the battery cell 10 and the second membrane bag 41, reducing the risk of internal short circuits in the battery device 100 and further enhancing its reliability.

[0152] According to some embodiments of this application, the first film bag 31 includes an aluminum-plastic film; and / or, the second film bag 41 includes an aluminum-plastic film.

[0153] In the above scheme, the first membrane bag 31 includes an aluminum-plastic film, which can reduce the material cost of the battery device 100, reduce the weight of the battery device 100, and increase the mass energy density of the battery device 100. Furthermore, the flexibility of the aluminum-plastic film can adapt to the deformation caused by the expansion of the battery cell 10 during its entire life cycle of charge and discharge, thereby reducing the risk of breakage at the connection between the thermal management component 30 and the current collector component due to expansion force, resulting in high reliability of the battery device 100. The second membrane bag 41 also includes an aluminum-plastic film, which can reduce the material cost of the battery device 100, reduce the weight of the battery device 100, and increase the mass energy density of the battery device 100. Furthermore, the flexibility of the aluminum-plastic film can adapt to the deformation caused by the expansion of the battery cell 10 during its entire life cycle of charge and discharge, thereby reducing the risk of breakage at the connection between the thermal management component 30 and the current collector component 40 due to expansion force, resulting in high reliability of the battery device 100.

[0154] Some embodiments of this application also provide an electrical device, which includes the battery device 100 provided above.

[0155] For example, please see Figure 1 The electrical device is a vehicle 1000. Inside the vehicle 1000, a controller 200, a motor 300, and a battery device 100 can be installed. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be installed at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, it can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1000.

[0156] This application provides a battery device 100 according to some embodiments; please refer to [link to relevant documentation]. Figures 3-13 The battery device 100 includes multiple rows of battery cells 10, multiple thermal management components 30, and two current collectors 40. The multiple rows of battery cells 10 are arranged along a first direction x, and each row of battery cells 10 includes multiple battery cells 10 arranged along a second direction y. The multiple thermal management components 30 are arranged along the first direction x, with a row of battery cells 10 positioned between adjacent thermal management components 30. The two current collectors 40 include a first current collector 40a and a second current collector 40b, which are located on the same side of the multiple rows of battery cells 10 along the second direction y.

[0157] The thermal management assembly 30 includes a first film bag 31, a first connecting portion 340, a second connecting portion 341, and a restraining member 32. The first film bag 31 is formed by enclosing and sealing aluminum-plastic film. The interior of the first film bag 31 has a first flow channel 33. The first wall 310 and the second wall 311, which are arranged opposite each other along a first direction x, are partially connected to each other through a thermoplastic process to form a recess 312 on the first wall 310, so that the first film bag 31 has a connecting area 313 and a recess 312 arranged along a third direction z. Multiple recesses 312 are arranged along a third direction z to divide the first flow channel 33 into multiple sub-flow channels 332 arranged along a third direction z and connected sequentially. The first sub-flow channel 332 is connected to the inlet 330 of the first flow channel 33, and the last sub-flow channel 332 is connected to the outlet 331 of the first flow channel 33. The first connecting portion 340 and the second connecting portion 341 are both connected to the first film bag 31 by injection molding and are both connected to the first flow channel 33. Both the first connecting portion 340 and the second connecting portion 341 include an interference-fit corrugated pipe opening (sub-opening). The constraint member 32 can be a rubber structural member, which includes a body 320 and a plurality of protrusions 321 disposed on the body 320. The plurality of protrusions 321 are arranged along the third direction z, and the protrusions 321 correspond one-to-one with the recesses 312. The protrusions 321 are disposed in the corresponding recesses 312. The body 320 is connected to the connecting area 313.

[0158] The flow collector assembly 40 includes a second membrane bag 41 and mating parts 43. The second membrane bag 41 is formed by enclosing and sealing aluminum-plastic film. The interior of the second membrane bag 41 has a second flow channel 42. Parts of the second membrane bag 41 are corrugated to form a buffer zone 411. The second membrane bag 41 includes a buffer zone 411 and a body region 410. The body regions 410 are arranged along a second direction y, and the buffer zone 411 is located between two adjacent body regions 410. Multiple mating parts 43 are provided, each corresponding to a first connecting part 340 or a second connecting part 341. The mating parts 43 are connected to the body region 410 of the second membrane bag 41 by injection molding and communicate with the second flow channel 42. The mating parts 43 may include an interference-fit corrugated nozzle (female nozzle) injection-molded into the second membrane bag 41. The first connecting part 340 can be inserted into the mating part 43 of the first current collector 40a, and the second connecting part 341 can be inserted into the mating part 43 of the second current collector 40b.

[0159] The first pipe 44 of the first manifold 40a and the second pipe 45 of the second manifold 40b can be disposed on the same wall of the housing 20. The first pipe 44 of the first manifold 40a can be connected to a fluid storage device, and the second pipe 45 of the second manifold 40b can be connected to a fluid storage device.

[0160] In the above scheme, the first membrane bag 31 and the second membrane bag 41 are respectively made of aluminum-plastic film. The first membrane bag 31 is at least part of the thermal management component 30 to regulate the temperature of the battery cell 10, and the second membrane bag 41 is at least part of the current collector component to collect the flow channels in multiple thermal management components 30, so that the fluid is concentratedly output or input into the battery device 100. On the one hand, it can reduce the manufacturing difficulty and overall quality of the thermal management component 30 and the current collector component 40, thereby reducing the manufacturing cost of the battery device 100 and improving the mass energy density of the battery device 100. On the other hand, it can adapt to the deformation of the battery cell 10 during the charge and discharge cycle expansion throughout its entire life cycle, thereby reducing the risk of breakage at the connection between the thermal management component 30 and the current collector component 40 due to the expansion force.

[0161] Meanwhile, a constraint member 32 is provided on the first membrane bag 31, which can improve the overall structural strength of the thermal management component 30 and effectively support the first flow channel 33 in the first membrane bag 31 so that the fluid in the first flow channel 33 can effectively regulate the temperature of the battery cell 10; on the other hand, it can effectively constrain the expansion of the battery cell 10, reduce the risk of the battery cell 10 failing due to expansion, and make the battery device 100 have high reliability.

[0162] Meanwhile, by configuring the connecting part 34 as including an interference-fit corrugated tube opening (female opening) injected into the first film bag 31, and configuring the mating part 43 as including an interference-fit corrugated tube opening (female opening) injected into the second film bag 41, the connection between the connecting part 34 and the mating part 43 can be redundant, adapting to the stress changes caused by the expansion of the battery cell 10 or the vibration of the battery device 100 by external forces, reducing the risk of connection failure of the connecting part 34 and the mating part 43 due to stress, and making the battery device 100 highly reliable.

[0163] Meanwhile, a buffer zone 411 is provided on the second membrane bag 41 so that the buffer zone 411 can adapt to the expansion of the battery cell 10 along the first direction x and deform, reducing the risk of deformation and mutual detachment failure of the connecting part 34 and the mating part 43 due to the tensile stress generated by the expansion of the battery cell 10, making the connection of the connecting part 34 and the mating part 43 stable and improving the reliability of the battery device 100.

[0164] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery device, characterized in that, include: Battery cell; A thermal management assembly, wherein there are multiple thermal management assemblies arranged along a first direction, and a battery cell is disposed between two adjacent thermal management assemblies; the thermal management assembly includes a first membrane bag having a first flow channel for containing fluid to regulate the temperature of the battery cell; A current collection assembly includes a second membrane bag having a second flow channel, the current collection assembly is connected to a plurality of thermal management components, and the second flow channel is connected to a plurality of first flow channels.

2. The battery device according to claim 1, characterized in that, The first flow channel includes an inlet, an outlet, and multiple sub-flow channels, which are connected sequentially. The inlet is connected to the first sub-flow channel, and the outlet is connected to the last sub-flow channel. The sub-channels extend along the second direction, and a plurality of the sub-channels are arranged along a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

3. The battery device according to claim 2, characterized in that, Along the first direction, the first film bag includes a first wall and a second wall disposed opposite to each other, the first wall having a recess on the side opposite to the second wall, the recess extending along the second direction, and the area of ​​the first wall corresponding to the recess being connected to the second wall. The number of recesses is multiple, and the multiple recesses are arranged along the third direction. The sub-channel is located between two adjacent recesses.

4. The battery device according to claim 2, characterized in that, The inlet and the outlet are located on the same side of the first film bag along the second direction; or, the inlet and the outlet are located on opposite sides of the first film bag along the second direction.

5. The battery device according to claim 1, characterized in that, The thermal management assembly further includes a constraint member connected to the first membrane bag and located on at least one side of the first membrane bag along the first direction.

6. The battery device according to claim 5, characterized in that, Along the first direction, the first membrane bag has a first wall and a second wall disposed opposite to each other, the first wall having a recess on the side opposite to the second wall, and at least a portion of the constraint member being located in the recess.

7. The battery device according to claim 6, characterized in that, The number of recesses is multiple, and the multiple recesses are arranged along a third direction. The first wall has a connecting area, and the connecting area is located between two adjacent recesses. The constraint member includes a body and a plurality of protrusions. The body extends along the third direction and connects to the plurality of protrusions. The plurality of protrusions are arranged along the third direction. The body is connected to the connection area. The protrusions correspond one-to-one with the recesses and the protrusions are located in the corresponding recesses.

8. The battery device according to claim 5, characterized in that, The number of the constraint members is multiple, and the multiple constraint members are arranged at intervals along the second direction, wherein the first direction and the second direction are perpendicular to each other.

9. The battery device according to claim 1, characterized in that, The thermal management component includes multiple connecting parts, including a first connecting part and a second connecting part. The first connecting part and the second connecting part are respectively connected to the first membrane bag, and the first connecting part is connected to the inlet of the first flow channel, and the second connecting part is connected to the outlet of the first flow channel. The current collection assembly includes multiple mating parts, each of which is connected to the second membrane bag and communicates with the second flow channel; The number of current collection components is multiple, including a first current collection component and a second current collection component. The mating part of the first current collection component is inserted into the first connecting part, and the mating part of the second current collection component is inserted into the second connecting part.

10. The battery device according to claim 9, characterized in that, The connecting portion is integrally formed with the first membrane bag; and / or The mating part and the second membrane bag are an integral structure.

11. The battery device according to claim 9, characterized in that, The connecting part includes a bellows, and / or the mating part includes a bellows.

12. The battery device according to claim 9, characterized in that, The thermal management component is located on one side of the current collector along the second direction, the current collector extends along the first direction, the first direction and the second direction are perpendicular to each other, and a plurality of the mating parts are arranged at intervals along the first direction; The second membrane bag includes a body region and a buffer zone arranged along the first direction. There are multiple body regions. The mating part is connected to the body region, and the buffer zone is located between two adjacent body regions.

13. The battery device according to claim 9, characterized in that, Along the first direction, there are multiple battery cells between adjacent thermal management components, and the multiple battery cells are arranged along the second direction, with the first direction and the second direction being perpendicular to each other; Along the second direction, the first current collector and the second current collector are located on the same side of the plurality of battery cells; Alternatively, along the second direction, a plurality of the battery cells are located between the first current collector and the second current collector.

14. The battery device according to any one of claims 1-13, characterized in that, The first membrane bag includes a first insulating layer, a first metal layer, and a second insulating layer, wherein the first metal layer is located between the first insulating layer and the second insulating layer, and the second insulating layer encloses and forms the first flow channel; and / or The second membrane bag includes a third insulating layer, a second metal layer and a fourth insulating layer, the second metal layer being located between the third insulating layer and the fourth insulating layer, and the fourth insulating layer enclosing to form the second flow channel.

15. The battery device according to any one of claims 1-13, characterized in that, The first film bag comprises an aluminum-plastic film; and / or, the second film bag comprises an aluminum-plastic film.

16. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1-15.

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