Battery device and electric device

Abstract

The invention discloses a battery device and a power utilization device, and belongs to the technical field of batteries, and the battery device comprises a battery monomer and a box body. The box body is provided with a containing cavity, the battery monomers are contained in the containing cavity, the box body comprises a bottom plate, and the bottom plate is used for bearing the battery monomers; wherein the light transmittance of the bottom plate is greater than or equal to 80%, and a flow channel is arranged in the bottom plate and is used for accommodating a heat exchange medium so as to manage the temperature of the battery monomers. According to the technical scheme, the reliability of the battery device can be improved.

Description

Technical Field

[0001] This application relates to the field of batteries, 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] Improving the reliability of battery devices is a pressing issue in battery technology. Summary of the Invention

[0004] In view of the above problems, this application provides a battery device and an electrical device that can improve the reliability of the battery device.

[0005] In a first aspect, embodiments of this application provide a battery device, including a battery cell and a housing. The housing has a receiving cavity in which the battery cell is received. The housing includes a base plate for supporting the battery cell. The base plate has a light transmittance of 80% or more, and a flow channel is provided inside the base plate for receiving a heat exchange medium to manage the temperature of the battery cell.

[0006] In the above technical solution, by setting the light transmittance of the base plate to be greater than or equal to 80%, the installation status of the battery cells within the casing and whether the battery cells have been bumped or knocked can be observed through the base plate. This reduces the number of times the casing needs to be opened for inspection, improves the installation efficiency of the battery cells and the casing, and simplifies the operation difficulty during the installation of the battery cells and the casing. Furthermore, since the flow channel is set inside the base plate, the temperature of the battery cells can be managed, improving the reliability of the battery device. Compared to setting additional thermal management components inside the casing, this reduces the risk of the thermal management components obstructing the battery cells and causing unobserved areas during inspection, thereby further improving the reliability of the battery device.

[0007] In some embodiments, the base plate is provided with a window that communicates with the flow channel, and the battery cell covers the window.

[0008] In the above technical solution, by setting a window that communicates with the flow channel and allowing the battery cell to cover the window, the heat exchange medium in the flow channel can directly contact the battery cell through the window, thereby improving the heat exchange efficiency between the heat exchange medium and the battery cell, and thus improving the reliability of the battery device.

[0009] In some embodiments, the battery device further includes a seal disposed around the window, the seal being used to seal the battery cell and the base plate.

[0010] In the above technical solution, by setting a seal around the window to seal the battery cell and the base plate, the risk of short circuits between battery cells and / or between battery cells and other structural components in the housing caused by the heat exchange medium flowing into the housing cavity is reduced, thereby improving the reliability of the battery device.

[0011] In some embodiments, the sealant includes a bonding adhesive surrounding the window and connecting the battery cell and the base plate.

[0012] In the above technical solution, by setting the sealing element to include a connecting adhesive, the battery cell and the base plate are sealed at the same time, and the battery cell and the base plate are connected by the connecting adhesive. This reduces the risk of collisions between battery cells and / or between battery cells and other structures inside the box caused by the movement of the battery cells relative to the box, thereby further improving the reliability of the battery device.

[0013] In some embodiments, the adhesive is a photosensitive adhesive.

[0014] In the above technical solution, since the base plate is made of transparent material, it is easy for ultraviolet rays to pass through the base plate to perform photosensitive curing of the bonding adhesive, thereby reducing the curing time of the bonding adhesive and improving the processing efficiency of the battery device.

[0015] In some embodiments, the base plate includes a body and a first protrusion, a flow channel is located within the body, the body has a first surface facing the battery cell, the first protrusion is disposed on the first surface, one end of a window communicates with the flow channel, the other end of the window extends to the surface of the first protrusion away from the body, the first protrusion is used to carry the battery cell; a seal is disposed around the outer periphery of the first protrusion and is at least partially located between the battery cell and the body to seal the battery cell and the body.

[0016] In the above technical solution, by providing a first protrusion on the first surface and using the first protrusion to support the battery cell, the contact area between the base plate and the battery cell is reduced compared to the case where the first surface directly abuts against the battery cell. This reduces the area of ​​the base plate that needs to maintain high flatness, facilitating the processing of the base plate. Simultaneously, since the sealing element is arranged around the outer periphery of the first protrusion, it is convenient to limit the sealing element through the first protrusion, reducing the assembly difficulty of the battery device.

[0017] In some embodiments, the seal includes a connecting adhesive disposed around the outer periphery of the first protrusion, the connecting adhesive being at least partially located between the battery cell and the body, and connecting the battery cell and the base plate.

[0018] In the above technical solution, since the other end of the window extends to the surface of the first protrusion away from the body, by wrapping the connecting adhesive around the outer periphery of the first protrusion, the risk of the connecting adhesive flowing into the flow channel through the window and blocking the flow channel is reduced, thereby improving the reliability of the battery device.

[0019] In some embodiments, the seal further includes a sealing ring, which is disposed around the outer periphery of the first protrusion, and a connecting adhesive is disposed around the outer periphery of the sealing ring. The sealing ring is at least partially located between the battery cell and the body, and abuts against the battery cell and the body.

[0020] In the above technical solution, the sealing element also includes a sealing ring, which is disposed around the outer periphery of the first protrusion, and the connecting adhesive is disposed around the outer periphery of the sealing ring, thereby forming a multi-layer seal between the sealing ring and the connecting adhesive, further improving the sealing performance between the battery cell and the body, and thus further improving the reliability of the battery device.

[0021] In some embodiments, the seal includes a sealing ring disposed around the outer periphery of the first protrusion, the sealing ring being at least partially located between the battery cell and the body, and abutting against the battery cell and the body.

[0022] In the above technical solution, since the other end of the window extends to the surface of the first protrusion away from the body, by wrapping the sealing ring around the outer periphery of the first protrusion, on the one hand, the sealing ring is limited by the first protrusion, reducing the risk of sealing failure caused by the sealing ring being sandwiched between the area of ​​the bottom plate with the window and the battery cell; on the other hand, it is convenient to adjust the height of the first protrusion protruding from the first surface to limit the compression size of the sealing ring after it is pressed by the battery cell and the body, which is beneficial to improving the sealing performance of the sealing ring and reducing the risk of sealing failure, thereby further improving the reliability of the battery device.

[0023] In some embodiments, there are multiple battery cells, and each battery cell has at least one window disposed opposite to it.

[0024] In the above technical solution, each battery cell is provided with at least one window, so that each battery can be in direct contact with the heat exchange medium, which is conducive to uniformly regulating the temperature of the battery cell, thereby reducing the risk of heat concentration in the battery cell and improving the reliability of the battery device.

[0025] In some embodiments, the battery device further includes a bonding adhesive that connects the battery cells and the base plate.

[0026] In the above technical solution, the battery cell and the base plate are connected by adhesive, which is simple and easy to implement. At the same time, since the light transmittance of the base plate is greater than or equal to 80%, it is easy to observe the bonding of the battery cell and the base plate by adhesive during the bonding process, which helps to improve the positioning accuracy of the battery cell and the base plate.

[0027] In some embodiments, the base plate includes a body and a partition, the body having a first surface facing the battery cell, the partition being disposed on the first surface, the partition and the body together defining a plurality of receiving spaces, each receiving space accommodating at least a portion of at least one battery cell.

[0028] In the above technical solution, the separation part helps to limit the position of the battery cells, thereby reducing the assembly difficulty of the battery device and reducing the risk of collision between battery cells and / or between battery cells and other structures in the box, thus further improving the reliability of the battery device.

[0029] In some embodiments, the base plate has internal flow channels for containing heat exchange medium to manage the temperature of the battery cells. The base plate has windows that communicate with the flow channels, and the battery cells cover the windows. Each accommodating space has at least one window.

[0030] In the above technical solution, by setting windows in each containment space, at least one battery cell in each containment space is in direct contact with the heat exchange medium, which helps to reduce the risk of heat concentration in the battery cells in the battery device, thereby improving the reliability of the battery device.

[0031] In some embodiments, the base plate further includes a first protrusion disposed on a first surface and located within a receiving space. One end of the window communicates with a flow channel, and the other end of the window extends to the surface of the first protrusion away from the body. The first protrusion is used to support a battery cell. Along the thickness direction of the body, the size of the partition is larger than the size of the first protrusion.

[0032] In the above technical solution, by making the size of the partition larger than the size of the first protrusion along the thickness direction of the body, the partition can still limit the battery cell when the battery cell is supported by the first protrusion, reducing the risk of collision between battery cells and / or between battery cells and other structures in the casing, thereby further improving the reliability of the battery device.

[0033] In some embodiments, the housing further includes a reinforcing member embedded in the body, and the orthographic projection of the reinforcing member is located within the orthographic projection of the partition in a projection plane perpendicular to the thickness direction of the body.

[0034] In the above technical solution, by setting up reinforcing members, the structural strength of the main body is increased. At the same time, by placing the orthographic projection of the reinforcing members within the orthographic projection of the partition in the projection plane perpendicular to the thickness direction of the main body, the risk of the reinforcing members interfering with the observation range is reduced when observing the installation status of the battery cells inside the box through the bottom plate along the thickness direction of the main body.

[0035] In some embodiments, the housing includes a first housing and a second housing, the second housing and the first housing together forming a receiving cavity, the first housing includes a frame and a bottom plate, the bottom plate is disposed at the bottom of the frame, an opening is formed on the side of the frame away from the bottom plate, the second housing covers the opening, and the frame and the bottom plate are integrally formed.

[0036] In the above technical solution, the frame and the bottom plate are integrally formed, thereby improving the overall integrity of the box components and the structural strength at the connection between the frame and the bottom wall, which in turn improves the structural strength of the box and helps to improve the reliability of the battery device.

[0037] In some embodiments, the light transmittance of the frame is greater than or equal to 80%.

[0038] In the above technical solution, by setting the light transmittance of the frame to be greater than or equal to 80%, the installation status of the battery cells in the box and whether the battery cells have been bumped or knocked can be observed through the frame, which increases the observation range, further improves the installation efficiency of the battery cells and the box, and simplifies the operation difficulty when installing the battery cells and the box.

[0039] In some embodiments, the light transmittance of the second housing is greater than or equal to 80%.

[0040] In the above technical solution, by setting the light transmittance of the second box to be greater than or equal to 80%, it is possible to observe whether there is any interference or damage between the assembly wiring harness and other structural components inside the box through the second box, thereby further increasing the observation range, further improving the installation efficiency of the battery cell and the box, and simplifying the operation difficulty when installing the battery cell and the box.

[0041] In some embodiments, the limiting oxygen index of the base plate is greater than or equal to 30%.

[0042] In the above technical solution, when the limiting oxygen index of the base plate is greater than or equal to 30%, the risk of the base plate burning when the battery cell experiences thermal runaway is reduced, thus improving the reliability of the battery device.

[0043] In some embodiments, the Vicat softening point of the base plate is greater than or equal to 215°C.

[0044] In the above technical solution, when the Vicat softening point of the base plate is greater than or equal to 215°C, the risk of softening and deformation of the base plate when thermal runaway occurs in the battery cell is reduced, thereby improving the reliability of the battery device.

[0045] In some embodiments, the tensile strength of the base plate is greater than or equal to 50 MPa.

[0046] In the above technical solution, when the tensile strength of the base plate is greater than or equal to 50MPa, the risk of permanent deformation or fracture of the base plate when supporting the battery cell is reduced, which enables the housing to provide a reliable working environment for the battery cell, thereby improving the reliability of the battery device.

[0047] Secondly, embodiments of this application also provide an electrical device, including the aforementioned battery device, which is used to provide electrical energy. Attached Figure Description

[0048] 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.

[0049] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments; Figure 2 Exploded view of the structure of a battery device provided in some embodiments of this application; Figure 3 Exploded views of the structure of a single battery cell provided in some embodiments of this application; Figure 4 A cross-sectional view of a first housing provided for some embodiments of this application; Figure 5 An exploded view of the structure of another battery device provided in some embodiments of this application; Figure 6 This is a schematic diagram of another first housing structure provided in some embodiments of this application; Figure 7 for Figure 6 Sectional view of AA; Figure 8 for Figure 6 A magnified view of a section at point B in the middle; Figure 9 for Figure 7 A magnified view of a section at point C; Figure 10 A partial cross-sectional view of yet another first housing provided for some embodiments of this application; Figure 11 A partial cross-sectional view of yet another first housing provided in some embodiments of this application; Figure 12 A partial cross-sectional view of yet another first housing provided in some embodiments of this application; Figure 13 A partial cross-sectional view of yet another first housing provided in some embodiments of this application; Figure 14 This is a schematic diagram of the structure of yet another first housing provided in some embodiments of this application; Figure 15 for Figure 14 A magnified view of a section at point D; Figure 16 for Figure 14 A partial sectional view of the middle EE; Figure 17 for Figure 14 A partial sectional view of FF.

[0050] Icons: 1000 - Vehicle; 100 - Battery Unit; 200 - Controller; 300 - Motor; 10 - Housing; 11 - First Housing; 11A - Receiving Cavity; 11B - Receiving Cavity; 11C - Receiving Space; 111 - Base Plate; 111A - Flow Channel; 111B - Window; 1111 - Body; 1111A - First Surface; 1112 - First Protrusion; 1113 - Divider; 1113A - First Divider; 1113B - Second Divider; 112 - Frame; 12 - Second Housing; 20-Battery cell; 21-End cap; 22-Housing; 23-Electrode assembly; 24-Insulator; 30 - Seal; 31 - Connecting adhesive; 32 - Sealing ring; 40 - Reinforcing member; 50 - Thermal management component; X - First direction; Y - Second direction; Z - Thickness direction of the body. Detailed Implementation

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] In this application, "multiple" means two or more (including two).

[0058] 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.

[0059] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0060] In related technologies, a battery cell generally includes a casing and an electrode assembly. The casing may include a housing and an end cap. The housing has an opening. After the electrode assembly is installed inside the housing, the opening of the housing can be closed by the end cap to form a sealed space inside the housing to accommodate the electrode assembly.

[0061] The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0062] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0063] In some implementations, the electrode assembly is a stacked structure.

[0064] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0065] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0066] The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0067] 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 prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0068] 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, which are connected in series, parallel, or mixed connections via a busbar.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0073] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0074] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0075] The following discussion will primarily focus on rectangular battery cells. It should be understood that the embodiments described below are also applicable in some respects to cylindrical battery cells, pouch cell cells, or blade cell cells.

[0076] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters. In addition, battery reliability also needs to be considered.

[0077] A battery casing typically consists of a first casing and a second casing, which are connected to form a closed casing. However, this connection makes it difficult to observe the internal structure of the battery cells. To facilitate observation of any impact damage to the bottom of the batteries, a transparent structure is often installed on the bottom plate of the casing. However, in battery assembly systems, to improve battery reliability and stability, thermal management components are usually installed inside the casing. These components contain a heat exchange medium to regulate the temperature of the multiple battery cells. The heat exchange medium can be water, a mixture of water and ethylene glycol, or air. Alternatively, a phase change material (PCM) can be used. PCM absorbs a large amount of latent heat as it changes from a liquid to a gaseous state, thus cooling the battery cells. This means the thermal management component can obstruct the transparent structure, making it difficult to observe whether the battery has been damaged by impacts, which could affect battery reliability.

[0078] Based on the above considerations, in order to improve the reliability of the battery device, this application provides a battery device including a battery cell and a housing. The housing has a receiving cavity in which the battery cell is housed. The housing includes a bottom plate for supporting the battery cell. The bottom plate is made of a transparent material and has flow channels inside for accommodating a heat exchange medium to manage the temperature of the battery cell.

[0079] In this type of battery device, by making the base plate transparent, the installation status of the internal structure and whether it has been damaged can be observed through the base plate. This reduces the number of times the box needs to be opened for inspection, improves operational efficiency, and simplifies the operation. Furthermore, since the flow channels are located inside the base plate, the temperature of the individual battery cells can be managed, improving the reliability of the battery device. Compared to the case where additional thermal management components are installed inside the box, this reduces the risk of the thermal management components obscuring the battery cells and causing unobserved areas during inspection, thus further enhancing the reliability of the battery device.

[0080] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0081] Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0082] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000; for example, the battery device 100 can serve as the operating power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0083] In some embodiments of this application, the battery device 100 can not only serve as the operating power or power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0084] To meet different power demands, the battery device 100 may include multiple battery cells 20, which can be connected in series, parallel, or a combination thereof. The battery device 100 may also be referred to as a battery pack. Optionally, the multiple battery cells 20 may first be connected in series, parallel, or a combination thereof to form a battery cell assembly, and then the battery cell assemblies may be connected in series, parallel, or a combination thereof to form the battery device 100. In other words, the multiple battery cells 20 can directly form the battery device 100, or they can first be assembled into battery cell assemblies, and then the battery cell assemblies can be assembled into the battery device 100.

[0085] Please refer to Figure 2 and Figure 3 , Figure 2 This is an exploded view of the structure of a battery device 100 according to some embodiments of this application. Figure 3 This is an exploded view of the structure of a battery cell 20 provided in some embodiments of this application. Embodiments of this application provide a battery device 100, including a battery cell 20 and a housing 10. The housing 10 has a receiving cavity 11A, within which the battery cell 20 is housed. The housing 10 includes a bottom plate 111 for supporting the battery cell 20. The bottom plate 111 has a light transmittance greater than or equal to 80%, and a flow channel 111A is provided inside the bottom plate 111 for containing a heat exchange medium to manage the temperature of the battery cell 20.

[0086] The battery cell 20 generally includes a housing and an electrode assembly 23. The housing may include a casing 22 and an end cap 21. The casing 22 has an opening. After the electrode assembly 23 is installed in the casing 22, the opening of the casing 22 can be closed by the end cap 21 to form a sealed space inside the casing to accommodate the electrode assembly 23.

[0087] The housing 10 is a shell-like structure in the battery device 100 used to house the individual battery cells 20 and provide them with a stable working environment. It is understood that the housing 10 should have a certain structural strength.

[0088] In some embodiments, the housing 10 includes a first housing 11 and a second housing 12, which are fitted together to form the housing 10. The first housing 11 and the second housing 12 together define a receiving cavity 11A for receiving the battery cell 20.

[0089] Optionally, the first housing 11 can be a hollow structure with a second opening at one end, and the second housing 12 can be a plate-like structure. The second housing 12 covers the second opening of the first housing 11 so that the first housing 11 and the second housing 12 together define the assembly space. Alternatively, the first housing 11 and the second housing 12 can both be hollow structures with one side open, and the open side of the second housing 12 covers the second opening of the first housing 11.

[0090] Of course, the box 10 formed by the first box 11 and the second box 12 can be of various shapes, such as a cylinder or a cuboid. For example, in... Figure 2 In the middle, box 10 has a rectangular structure.

[0091] The receiving cavity 11A is a battery compartment inside the box 10 used to house the battery cells 20.

[0092] In some embodiments, the housing 10 further includes a receiving cavity 11B, which is an electrical cavity for accommodating electrical structural components. The receiving cavity 11B and the receiving cavity 11A are arranged along a first direction X, which is parallel to the length direction of the battery device 100.

[0093] The base plate 111 is the wall of the housing 10 used to support the battery cell 20 along the direction of gravity. It can be understood that the battery cell 20 can be in direct contact with the base plate 111 or the battery cell 20 can be connected to the base plate 111 through a thermally conductive material.

[0094] The base plate 111 is a plate-shaped component for supporting the battery cell 20. For example, the base plate 111 may be provided with structural members for restricting the movement of the battery cell 20.

[0095] "The light transmittance of the base plate 111 is greater than or equal to 80%" means that when light is incident perpendicularly through the base plate 111, the ratio of the light flux transmitted through the base plate 111 to the light flux hitting the base plate 111 is greater than or equal to 80%. This allows the operator or testing device to observe the battery cells 20 inside the housing 10 through the base plate 111.

[0096] Understandably, the base plate 111 can be made of a transparent and light-transmitting material. Transparent materials include transparent plastic. By making the transparent material include transparent plastic, the base plate 111 has a certain strength, is not easily broken, and has good transparency, thus facilitating observation of the installation status of the structure inside the enclosure 10 and whether it has been damaged. For example, the base plate 111 can be made of materials such as polycarbonate, engineering plastics, or tempered glass.

[0097] By setting the light transmittance of the base plate 111 to be greater than or equal to 80%, the installation status of the battery cell 20 inside the housing 10 and whether the battery cell 20 has been bumped or damaged can be observed through the base plate 111. This reduces the number of times the housing 10 needs to be opened for inspection, improves the installation efficiency of the battery cell 20 and the housing 10, and simplifies the operation difficulty when installing the battery cell 20 and the housing 10.

[0098] Please refer to Figure 4 , Figure 4This is a cross-sectional view of a first housing provided for some embodiments of this application. The bottom plate 111 has a flow channel 111A inside, which is used to contain the heat exchange medium.

[0099] In some embodiments, please refer to Figure 2 A thermal management component 50 is provided inside the housing 10. The interior of the thermal management component 50 communicates with the flow channel 111A of the base plate 111 to contain fluid for regulating the temperature of multiple battery cells 20. Multiple thermal management components 50 are spaced apart along the length of the housing 10, and at least one battery cell 20 is disposed between two adjacent thermal management components 50. Exemplarily, to increase the contact area between the thermal management component and the battery cell, the thermal management component is disposed on the side of the surface with the largest area of ​​the battery cell 20.

[0100] Please refer to Figure 4 The flow channel 111A is used to contain the heat exchange medium to manage the temperature of the battery cell 20. That is, the base plate 111 acts as a thermal management component to contain fluid to regulate the temperature of multiple battery cells 20.

[0101] In some embodiments, the base plate 111 is made of plastic and is formed by injection molding, with a flow channel 111A formed inside the base plate 111.

[0102] The flow channel 111A refers to a portion that can accommodate and allow the heat exchange medium to flow. In some embodiments, the external pipeline of the flow channel 111A is connected to an electrical device via a connector. The heat exchange medium storage device (e.g., a water tank) in the electrical device supplies the heat exchange medium to the flow channel 111A through the external pipeline, enabling the heat exchange medium to circulate between the flow channel 111A and the medium storage device. For example, when it is necessary to heat the battery cell 20, the medium in the heat exchange medium storage device flows out and is heated. The heated medium can flow into the flow channel 111A to heat the battery cell 20 in the housing 10, and then flows back to the heat exchange medium storage device.

[0103] In some embodiments, the flow channel 111A inside the base plate 111 can be arranged in a roundabout manner so that the contact area between the heat exchange medium and the battery cell 20 is larger.

[0104] In some embodiments, the flow channel 111A covers the bottom wall of the receiving cavity 11A.

[0105] In some embodiments, the flow channel 111A covers the bottom wall of the receiving cavity 11A and the receiving cavity 11B.

[0106] The heat exchange medium can be a liquid, a gas, or a solid-liquid phase change material. Solid-liquid phase change materials are initially solid, but can turn into a liquid after absorbing heat.

[0107] For example, the heat exchange medium can be water, a mixture of water and ethylene glycol, or air, etc.

[0108] "Managing the temperature of the battery cells 20" refers to heating or cooling multiple battery cells 20. When cooling or lowering the temperature of the battery cells 20, the flow channel 111A within the base plate 111 is used to contain a cooling heat exchange medium. This allows the heat exchange medium to absorb heat from the battery cells 20 through heat transfer via the base plate 111 or by direct contact with the battery cells 20, thereby lowering the temperature of the multiple battery cells 20. The contained heat exchange medium can also be called a cooling medium or cooling heat exchange medium; more specifically, it can be called a coolant or a cooling gas. Alternatively, the base plate 111 can also be used to heat the multiple battery cells 20 to raise their temperature; however, this embodiment of the application does not limit this use.

[0109] Understandably, by providing flow channel 111A in the base plate 111, it is not necessary to provide thermal management components on the inner surface of the base plate 111, thereby reducing the number of structural components in the housing 10. This allows more space in the housing cavity 11B of the housing 10 to be used to accommodate the battery cell 20, which in turn helps to improve the volumetric energy density of the battery device 100.

[0110] In the above technical solution, and since the flow channel 111A is set in the base plate 111, the reliability of the battery device 100 can be improved by managing the temperature of the battery cell 20. Compared with the case where additional thermal management components are set in the housing 10, the risk of the thermal management components blocking the battery cell 20 and causing unobserved areas during inspection is reduced, thereby further improving the reliability of the battery device 100.

[0111] Please refer to Figure 2 and Figure 3 According to some embodiments of this application, the battery device further includes a connecting adhesive 31, which connects the battery cell 20 and the base plate 111.

[0112] For example, the adhesive 31 can be made of various materials, such as epoxy resin adhesive, natural resin adhesive, etc.

[0113] In some embodiments, please refer to Figure 2 The adhesive 31 completely covers the surface of the base plate 111 located within the receiving cavity 11A. In other embodiments, the adhesive 31 partially covers the surface of the base plate 111 located within the receiving cavity 11A.

[0114] Understandably, the adhesive 31 has the function of restricting the movement of the battery cell 20 relative to the base plate 111.

[0115] In some embodiments, please refer to Figure 3An insulating element 24 is provided on the outer surface of the housing 22 of the battery cell 20. The insulating element 24 may cover part or all of the outer surface of the housing 22. In embodiments where the insulating element 24 does not completely cover the surface of the housing 22, an adhesive for connecting the housings 22 can be directly applied to the portion of the housing 22 not covered by the insulating element 24, or a connecting adhesive 31 for connecting the housing 22 and the casing 10 can be directly applied to the portion of the housing 22 not covered by the insulating element 24.

[0116] In the above technical solution, the battery cell 20 and the base plate 111 are connected by the adhesive 31, which is simple and easy to implement. At the same time, since the light transmittance of the base plate 111 is greater than or equal to 80%, it is easy to observe the bonding of the battery cell 20 and the base plate 111 through the adhesive 31 during the bonding process, which helps to improve the positioning accuracy of the battery cell 20 and the base plate 111.

[0117] Please refer to Figures 5-7 Please refer to Figure 8 and Figure 9 , Figure 5 This is an exploded view of the structure of another battery device 100 provided in some embodiments of this application. Figure 6 This is a schematic diagram of another first housing 11 provided in some embodiments of this application. Figure 7 for Figure 6 Sectional view of AA, Figure 8 for Figure 6 A magnified view of a section at point B in the middle; Figure 9 for Figure 7 A partial enlarged view at point C. According to some embodiments of this application, the base plate 111 is provided with a window 111B, which communicates with the flow channel 111A, and the battery cell 20 covers the window 111B.

[0118] Window 111B is an opening structure provided on the inner surface of base plate 111. Exemplarily, when window 111B is not covered by battery cell 20, part of flow channel 111A can be exposed in receiving cavity 11A through window 111B. Understandably, window 111B can be of various shapes, such as rectangular, circular, etc.

[0119] In some embodiments, the insulating element 24 at least covers the outer surface of the housing 22 to cover the portion of the window 111B, thereby reducing the risk of internal short circuits between the battery cells 20 through the heat exchange medium.

[0120] "Battery cell 20 covering window 111B" refers to sealing window 111B of battery cell 20 to isolate flow channel 111A and receiving cavity 11A.

[0121] In some embodiments, the base plate 111 has a first surface 1111A for supporting the battery cell 20, and a window 111B is disposed on the first surface 1111A, with the orthographic projection of the battery cell 20 on the first surface 1111A covering the window 111B.

[0122] In this embodiment, by setting a window 111B that communicates with the flow channel 111A and making the battery cell 20 cover the window 111B, the heat exchange medium in the flow channel 111A can directly contact the battery cell 20 through the window 111B, thereby improving the heat exchange efficiency between the heat exchange medium and the battery cell 20, and thus improving the reliability of the battery device 100.

[0123] Please refer to Figure 10 , Figure 10 This is a partial cross-sectional view of another first housing 11 provided for some embodiments of this application. According to some embodiments of this application, the battery device 100 also includes a seal 30 disposed around the window 111B, the seal 30 for sealing the battery cell 20 and the base plate 111.

[0124] In some embodiments, the material of the seal 30 can be plastic, rubber, or other materials. The seal 30 can deform and can return to its original position after deformation. After the base plate 111 supports the battery cell 20, there is a gap between the base plate 111 and the battery cell 20. The seal 30 is disposed in this gap. When the battery cell 20 is placed on the base plate 111, it compresses the seal 30, thereby causing the seal 30 to undergo elastic deformation. Because the seal 30 has elastic deformation capability, it can be well attached to the battery cell 20 and the base plate 111 to seal the gap between the battery cell 20 and the base plate 111, reducing the risk of heat exchange medium at window 111B seeping into the receiving cavity 11A.

[0125] In some embodiments, the seal 30 may be an adhesive.

[0126] In this embodiment, by providing a sealing element 30 around the sealed battery cell 20 and the base plate 111 at the window 111B, the risk of short circuits between battery cells 20 and / or between battery cells 20 and other structural components in the housing 10 caused by the flow of heat exchange medium into the housing cavity 11A is reduced, thereby improving the reliability of the battery device 100.

[0127] Please refer to Figure 10 According to some embodiments of this application, the seal 30 includes a connecting adhesive 31, which surrounds the window 111B and connects the battery cell 20 and the base plate 111.

[0128] The adhesive 31 is positioned around the window 111B, meaning that the adhesive 31 is positioned on the outer periphery of the window 111B and does not enter the window 111B.

[0129] For example, the adhesive 31 can be made of various materials, such as epoxy resin adhesive, natural resin adhesive, etc. Understandably, the adhesive 31 has the function of restricting the movement of the battery cell 20 relative to the base plate 111.

[0130] In this embodiment, by setting the sealant 30 to include the connecting adhesive 31, the battery cell 20 and the base plate 111 are sealed at the same time, and the battery cell 20 and the base plate 111 are connected by the connecting adhesive 31. This reduces the risk of collision between battery cells 20 and / or between battery cells 20 and other structures inside the housing 10 caused by the movement of the battery cell 20 relative to the housing 10, thereby further improving the reliability of the battery device 100.

[0131] According to some embodiments of this application, the adhesive 31 is a photosensitive adhesive.

[0132] For example, the binder 31 can be a UV (Ultraviolet Rays) adhesive. UV adhesives contain photoinitiators. When absorbing ultraviolet energy of a specific wavelength, the photoinitiator is activated, triggering a chain polymerization reaction between the monomers and prepolymers in the adhesive, rapidly transforming from a liquid to a solid within seconds to tens of seconds. This allows for control of the curing time of the binder 31 by adjusting parameters such as light intensity and wavelength, given a fixed composition. This facilitates coordination with production schedules and improves production efficiency.

[0133] Understandably, the base plate 111 should be made of a transparent material with low UV absorption.

[0134] In some embodiments, the seal 30 includes a sealing ring 32 and a connecting adhesive 31. The sealing ring 32 is disposed around the outer periphery of the first protrusion 1112, and the connecting adhesive 31 is disposed around the outer periphery of the sealing ring 32. The sealing ring 32 is at least partially located between the battery cell 20 and the body 1111, and abuts against the battery cell 20 and the body 1111. The inner peripheral surface of the sealing ring 32 is in contact with the outer peripheral surface of the first protrusion 1112, and the connecting adhesive 31 extends to the outer peripheral surface of the sealing ring 32. The connecting adhesive 31 is a photosensitive adhesive. After photocuring, the inner peripheral surface of the connecting adhesive 31 abuts against the inner peripheral surface of the sealing ring 32. Therefore, compared with the case where a flexible connecting adhesive 31 is used, the risk of both the connecting adhesive 31 and the sealing ring 32 failing to seal due to the continuous and slow compression of the connecting adhesive 31 after the sealing ring 32 is pressed by the battery cell 20 and the body 1111 can be reduced.

[0135] In this embodiment, since the base plate 111 is made of transparent material, it is easy for ultraviolet rays to pass through the base plate 111 to perform photosensitive curing on the adhesive 31, thereby reducing the curing time of the adhesive 31 and improving the processing efficiency of the battery device 100.

[0136] Please refer to Figures 11-13 , Figures 11-13 Partial cross-sectional views of three first housings 11 provided for some embodiments of this application. According to some embodiments of this application, the base plate 111 includes a body 1111 and a first protrusion 1112. A flow channel 111A is located inside the body 1111. The body 1111 has a first surface 1111A facing the battery cell 20. The first protrusion 1112 is disposed on the first surface 1111A. One end of a window 111B communicates with the flow channel 111A, and the other end of the window 111B extends to the surface of the first protrusion 1112 away from the body 1111. The first protrusion 1112 is used to carry the battery cell 20. A sealing member 30 is disposed around the outer periphery of the first protrusion 1112 and is at least partially located between the battery cell 20 and the body 1111 to seal the battery cell 20 and the body 1111.

[0137] The body 1111 is the main part of the base plate 111. In some embodiments, the housing 10 includes a frame 112 surrounding the edge of the base plate 111, and the edge of the body 1111 is connected to the frame 112.

[0138] The first surface 1111A is the inner surface of the body 1111.

[0139] The first protrusion 1112 is a protruding structure that protrudes from the first surface 1111A of the body 1111. For example, the first protrusion 1112 can be integrally formed with the body 1111 by injection molding or other means, or the first protrusion 1112 can be formed on the first surface 1111A by machining.

[0140] Understandably, the inner circumferential surface of the seal 30 can fit against the outer circumferential surface of the first protrusion 1112 so that when the seal 30 is fitted onto the outer circumferential side of the first protrusion 1112, the first protrusion 1112 can limit the seal 30.

[0141] In this embodiment, by providing a first protrusion 1112 on the first surface 1111A and using the first protrusion 1112 to support the battery cell 20, the contact area between the base plate 111 and the battery cell 20 is reduced compared to the case where the first surface 1111A directly abuts against the battery cell 20. This reduces the area of ​​the base plate 111 that needs to maintain high flatness, facilitating the processing of the base plate 111. Simultaneously, since the sealing member 30 is arranged around the outer periphery of the first protrusion 1112, it is convenient to limit the sealing member 30 through the first protrusion 1112, reducing the assembly difficulty of the battery device 100.

[0142] Please refer to Figure 11According to some embodiments of this application, the seal 30 includes a connecting adhesive 31, which is disposed around the outer periphery of the first protrusion 1112. The connecting adhesive 31 is at least partially located between the battery cell 20 and the body 1111, and connects the battery cell 20 and the base plate 111.

[0143] In some embodiments, there are multiple first protrusions 1112 and windows 111B in a one-to-one correspondence. The multiple first protrusions 1112 are arranged in multiple rows spaced apart along a first direction X. Each row of first protrusions 1112 is arranged in multiple rows spaced apart along a second direction Y. A connecting adhesive 31 is provided between two adjacent first protrusions 1112 along the first direction X and / or along the second direction Y. The first direction X is parallel to the length direction of the battery device 100, and the second direction Y is parallel to the width direction of the battery device 100.

[0144] In this embodiment, since the other end of the window 111B extends to the surface of the first protrusion 1112 away from the body 1111, by wrapping the adhesive 31 around the outer periphery of the first protrusion 1112, the risk of the adhesive 31 flowing into the flow channel 111A through the window 111B and blocking the flow channel 111A is reduced by the first protrusion 1112, thereby improving the reliability of the battery device 100.

[0145] Please refer to Figure 12 According to some embodiments of this application, the seal 30 further includes a sealing ring 32, which is disposed around the outer periphery of the first protrusion 1112, and the adhesive 31 is disposed around the outer periphery of the sealing ring 32. The sealing ring 32 is at least partially located between the battery cell 20 and the body 1111, and abuts against the battery cell 20 and the body 1111.

[0146] In some implementations, the inner circumferential surface of the sealing ring 32 is in contact with the outer circumferential surface of the first protrusion 1112. When the battery cell 20 and the body 1111 compress the sealing ring 32, the first protrusion 1112 is used to limit the elastic deformation of the sealing ring 32 in the direction closer to the window 111B.

[0147] Understandably, by surrounding the sealing ring 32 with the adhesive 31, the sealing ring 32 can simultaneously restrict the flow of the adhesive 31 to the window 111B when the battery cell 20 and the body 1111 compress the sealing ring 32, thereby reducing the risk of the window 111B being blocked by the adhesive 31.

[0148] In some embodiments, there are multiple first protrusions 1112 and windows 111B that correspond one-to-one. The multiple first protrusions 1112 are arranged in multiple rows spaced apart along a first direction X. Sealing rings 32 are arranged one-to-one with the first protrusions 1112. Each row of first protrusions 1112 is arranged in multiple rows spaced apart along a second direction Y. Adhesive 31 is provided between adjacent sealing rings 32 along the first direction X and / or along the second direction Y. The first direction X is parallel to the length direction of the battery device 100, and the second direction Y is parallel to the width direction of the battery device 100.

[0149] In this embodiment, the sealing element 30 further includes a sealing ring 32, which is disposed around the outer periphery of the first protrusion 1112, and the adhesive 31 is disposed around the outer periphery of the sealing ring 32, thereby forming a multi-layer seal between the sealing ring 32 and the adhesive 31, which further improves the sealing performance between the battery cell 20 and the body 1111, thereby further improving the reliability of the battery device 100.

[0150] Please refer to Figure 13 According to some embodiments of this application, the seal 30 includes a sealing ring 32, which is disposed around the outer periphery of the first protrusion 1112. The sealing ring 32 is at least partially located between the battery cell 20 and the body 1111, and abuts against the battery cell 20 and the body 1111.

[0151] In this embodiment, since the other end of the window 111B extends to the surface of the first protrusion 1112 away from the body 1111, by wrapping the sealing ring 32 around the outer periphery of the first protrusion 1112, on the one hand, the sealing ring 32 is limited by the first protrusion 1112, reducing the risk of sealing failure caused by the sealing ring 32 being sandwiched between the area of ​​the bottom plate 111 where the window 111B is provided and the battery cell 20; on the other hand, by adjusting the height of the first protrusion 1112 protruding from the first surface 1111A, the compression size of the sealing ring 32 after being pressed by the battery cell 20 and the body 1111 is limited, which is beneficial to improving the sealing performance of the sealing ring 32 and reducing the risk of sealing failure of the sealing ring 32, thereby further improving the reliability of the battery device 100.

[0152] According to some embodiments of this application, there are multiple battery cells 20, and each battery cell 20 is provided with at least one window 111B.

[0153] To meet different power demands, the battery device 100 may include multiple battery cells 20, which can be connected in series, parallel, or a combination thereof. The battery device 100 may also be referred to as a battery pack. Optionally, the multiple battery cells 20 may first be connected in series, parallel, or a combination thereof to form a battery cell assembly, and then the battery cell assemblies may be connected in series, parallel, or a combination thereof to form the battery device 100. In other words, the multiple battery cells 20 can directly form the battery device 100, or they can first be assembled into battery cell assemblies, and then the battery cell assemblies can be assembled into the battery device 100.

[0154] The number of battery cells 20 in a battery cell assembly 20 can be set to any value depending on different power demands. Multiple battery cells 20 can be connected in series, parallel, or mixed connections to achieve a larger capacity or power. Since each battery device 100 may include a large number of battery cells 20, for ease of installation, the battery cells 20 can be grouped, with each group forming a battery cell assembly 20. The number of battery cells 20 included in a battery cell assembly 20 is unlimited and can be set according to requirements. The battery device 100 may include multiple battery cell assemblies 20, which can be connected in series, parallel, or mixed connections.

[0155] Having at least one window 111B opposite to each battery cell 20 means that each battery cell 20 can cover one window 111B, or each battery cell 20 can cover two windows 111B, or each battery cell 20 can cover three, four, five or more windows 111B.

[0156] In this embodiment, each battery cell 20 is provided with at least one window 111B, so that each battery can be in direct contact with the heat exchange medium, which is beneficial to uniformly regulate the temperature of the battery cell 20, thereby reducing the risk of heat concentration in the battery cell 20 and improving the reliability of the battery device 100.

[0157] Please refer to Figures 14-16 , Figure 14 This is a schematic diagram of the structure of another first housing 11 provided in some embodiments of this application. Figure 15 for Figure 14 A magnified view of a section at point D. Figure 16 for Figure 14Partial cross-sectional view of EE. According to some embodiments of this application, the base plate 111 includes a body 1111 and a partition 1113, a flow channel 111A is located within the body 1111, the body 1111 has a first surface 1111A facing the battery cell 20, the partition 1113 is disposed on the first surface 1111A, the partition 1113 and the body 1111 together define a plurality of receiving spaces 11C, each receiving space 11C receiving at least a portion of at least one battery cell 20.

[0158] The partition 1113 is a protruding structure that protrudes from the first surface 1111A of the body 1111. For example, the partition 1113 can be integrally formed with the body 1111 by injection molding or the like, or the partition 1113 can be formed on the first surface 1111A by processing.

[0159] In some embodiments, the partition 1113 includes a first partition 1113A, which extends along a second direction Y. The opposite ends of the first partition 1113A in the second direction Y extend to two opposite edges of the body 1111 in the second direction Y. There are multiple first partitions 1113A, spaced apart along a first direction X. Along the first direction X, two adjacent first partitions 1113A abut against opposite sides of the same battery cell 20. The first direction X and the second direction Y are mutually perpendicular to the thickness direction of the base plate 111.

[0160] In some embodiments, the partition 1113 includes a first partition 1113A and a second partition 1113B. The first partition 1113A extends along a second direction Y, and its opposite ends in the second direction Y extend to two opposite edges of the body 1111 disposed in the second direction Y. The second partition 1113B extends along a first direction X, and its opposite ends in the first direction X extend to two opposite edges of the body 1111 disposed in the first direction X. There are multiple first partitions 1113A, which are spaced apart along the first direction X. There are multiple second partitions 1113B, which are spaced apart along the second direction Y. Along the first direction X, two adjacent first partitions 1113A abut against opposite sides of the same battery cell 20. Along the second direction Y, two adjacent second partitions 1113B abut against opposite sides of the same battery cell 20.

[0161] The accommodating space 11C is the space formed by the partition 1113 and the main body 1111 for accommodating the battery cell 20.

[0162] For example, on a projection plane perpendicular to the first direction X, the orthographic projection of the first partition 1113A partially overlaps with the orthographic projection of the casing 22 of the battery cell 20, while the orthographic projection of the first partition 1113A does not overlap with the orthographic projection of the electrode assembly 23 of the battery cell 20. This results in a gap between two adjacent battery cells 20 in the first direction X, allowing the battery cell 20 to expand. Before the battery cell 20 expands, the orthographic projection of this gap on the first surface 1111A overlaps with the first partition 1113A. On a projection plane perpendicular to the second direction Y, the orthographic projection of the second partition 1113B partially overlaps with the orthographic projection of the casing 22 of the battery cell 20, while the orthographic projection of the second partition 1113B does not overlap with the orthographic projection of the electrode assembly 23 of the battery cell 20. This results in a gap between two adjacent battery cells 20 in the second direction Y, allowing the battery cell 20 to expand. Before the battery cell 20 expands, the orthographic projection of this gap on the first surface 1111A overlaps with the second partition 1113B.

[0163] In this embodiment, the partition 1113 helps to limit the position of the battery cell 20, thereby reducing the assembly difficulty of the battery device 100 and reducing the risk of collision between battery cells 20 and / or between battery cells 20 and other structures inside the housing 10, thereby further improving the reliability of the battery device 100.

[0164] Please refer to Figures 14-16 According to some embodiments of this application, the base plate 111 has a flow channel 111A inside, which is used to contain a heat exchange medium to manage the temperature of the battery cell 20. The base plate 111 has a window 111B, which communicates with the flow channel 111A. The battery cell 20 covers the window 111B, and each accommodating space 11C has at least one window 111B.

[0165] In some embodiments, the battery device 100 further includes a seal 30, with the receiving hole, the seal 30 and the window 111B corresponding one-to-one. The seal 30 is disposed around the window 111B and is used to seal the battery cell 20 and the base plate 111. The outer peripheral surface of the seal 30 fits against the inner peripheral surface of the receiving space 11C to limit the seal 30 by the partition 1113.

[0166] In this embodiment, by providing a window 111B in each accommodating space 11C, at least one battery cell 20 in each accommodating space 11C is in direct contact with the heat exchange medium, which helps to reduce the risk of heat concentration in the battery cell 20 in the battery device 100, thereby improving the reliability of the battery device 100.

[0167] Please refer to Figures 14-16According to some embodiments of this application, the base plate 111 further includes a first protrusion 1112, which is disposed on the first surface 1111A and located in the receiving space 11C. One end of the window 111B communicates with the flow channel 111A, and the other end of the window 111B extends to the surface of the first protrusion 1112 away from the body 1111. The first protrusion 1112 is used to support the battery cell 20. Along the thickness direction Z of the body, the size of the partition 1113 is larger than the size of the first protrusion 1112.

[0168] In some embodiments, the battery device 100 further includes a seal 30, with the receiving hole, the seal 30, the first protrusion 1112, and the window 111B corresponding one-to-one. The seal 30 is disposed around the window 111B and is used to seal the battery cell 20 and the base plate 111. The inner peripheral surface of the seal 30 is in contact with the outer peripheral surface of the first protrusion 1112, and the outer peripheral surface of the seal 30 is in contact with the inner peripheral surface of the receiving space 11C, so as to limit the seal 30 by the partition 1113 and the first protrusion 1112.

[0169] The dimension of the partition 1113 along the thickness direction Z of the body refers to the dimension by which the partition 1113 protrudes from the first surface 1111A along the thickness direction Z of the body; the dimension of the first protrusion 1112 along the thickness direction Z of the body refers to the dimension by which the first protrusion 1112 protrudes from the first surface 1111A along the thickness direction Z of the body.

[0170] Understandably, along the thickness direction Z of the body, the first protrusion 1112 protrudes from the first surface 1111A by an amount of H1, and the partition 1113 protrudes from the first surface 1111A by an amount of H2, where H2 > H1.

[0171] In this embodiment, the size of the partition 1113 is larger than the size of the first protrusion 1112 along the thickness direction Z of the body, so that when the battery cell 20 is supported by the first protrusion 1112, the partition 1113 can still limit the battery cell 20, reducing the risk of collision between battery cells 20 and / or between battery cells 20 and other structures inside the housing 10, thereby further improving the reliability of the battery device 100.

[0172] Please refer to Figure 14 and Figure 17 , Figure 17 for Figure 14 Partial cross-sectional view of FF. According to some embodiments of this application, the housing 10 also includes a reinforcing member 40, which is embedded in the body 1111. In the projection plane perpendicular to the thickness direction Z of the body, the orthographic projection of the reinforcing member 40 is located within the orthographic projection of the partition 1113.

[0173] The reinforcing member 40 is a structural member embedded in the body 1111 to increase the strength of the body 1111.

[0174] For example, the reinforcing member 40 can be a metal structural member, such as a metal wire or metal strip.

[0175] In this embodiment, by providing a reinforcing member 40, the structural strength of the body 1111 is increased. At the same time, by placing the orthographic projection of the reinforcing member 40 within the orthographic projection of the partition 1113 in the projection plane perpendicular to the thickness direction Z of the body, the risk of the reinforcing member 40 interfering with the observation range is reduced when observing the installation status of the battery cells 20 inside the housing 10 through the bottom plate 111 along the thickness direction Z of the body.

[0176] Please refer to Figure 2 and Figure 5 According to some embodiments of this application, the box 10 includes a first box 11 and a second box 12. The second box 12 and the first box 11 together form a receiving cavity 11A. The first box 11 includes a frame 112 and a bottom plate 111. The bottom plate 111 is disposed at the bottom of the frame 112. An opening is formed on the side of the frame 112 away from the bottom plate 111. The second box 12 covers the opening. The frame 112 and the bottom plate 111 are integrally formed.

[0177] The frame 112 is a structural component used to enclose the side walls forming the perimeter of the housing 10. Exemplarily, the base plate 111 may be made of the same material as the frame 112, or the base plate 111 may be made of a different material than the frame 112. It is understood that the frame 112 and the base plate 111 may be integrally formed by means such as injection molding.

[0178] In this embodiment, the frame 112 and the base plate 111 are integrally formed, thereby improving the overall integrity of the housing 10 components and the structural strength at the connection between the frame 112 and the base plate 111, which in turn improves the structural strength of the housing 10 and helps to improve the reliability of the battery device 100.

[0179] According to some embodiments of this application, the light transmittance of the frame 112 is greater than or equal to 80%.

[0180] "The light transmittance of the frame 112 is greater than or equal to 80%" means that when light is incident perpendicularly through the frame 112, the ratio of the light flux transmitted through the frame 112 to the light flux incident on the frame 112 is greater than or equal to 80%. This allows the operator or detection device to observe the battery cells 20 inside the housing 10 through the frame 112.

[0181] Understandably, the frame 112 can be made of a transparent and light-transmitting material. Transparent materials include transparent plastic. By making the transparent material include transparent plastic, the frame 112 has a certain strength, is not easily broken, and has good transparency, thus facilitating observation of the installation status of the structure inside the housing 10 and whether it has been damaged. For example, the frame 112 can be made of materials such as polycarbonate, engineering plastics, or tempered glass.

[0182] For example, the frame 112 and the base plate 111 may both be made of polycarbonate, or the frame 112 and the base plate 111 may both be made of engineering plastic, or the frame 112 and the base plate 111 may both be made of tempered glass, so that the frame 112 and the base plate 111 can be integrally formed.

[0183] In this embodiment, by setting the light transmittance of the frame 112 to be greater than or equal to 80%, the installation status of the battery cell 20 in the box and whether the battery cell 20 has been bumped or knocked can be observed through the frame 112, which increases the observation range, further improves the installation efficiency of the battery cell 20 and the box 10, and simplifies the operation difficulty when installing the battery cell 20 and the box 10.

[0184] According to some embodiments of this application, the light transmittance of the second housing 12 is greater than or equal to 80%.

[0185] "The transmittance of the second enclosure 12 is greater than or equal to 80%" means that when light is incident perpendicularly through the second enclosure 12, the ratio of the light flux transmitted through the second enclosure 12 to the light flux incident on the second enclosure 12 is greater than or equal to 80%. This allows the operator or detection device to observe the battery cells 20 inside the enclosure 10 through the second enclosure 12.

[0186] The second box 12 is a plate-like structure in the body 1111 of the box 10 used to close the opening.

[0187] Understandably, the second enclosure 12 can be made of a transparent and light-transmitting material. Transparent materials include transparent plastic. By using transparent plastic as the transparent material, the second enclosure 12 gains sufficient strength, is less prone to breakage, and has good transparency, thus facilitating observation of the installation status of the structure inside the enclosure 10 and whether it has been damaged. For example, the second enclosure 12 can be made of materials such as polycarbonate, engineering plastics, or tempered glass.

[0188] In this embodiment, by setting the light transmittance of the second housing 12 to be greater than or equal to 80%, the assembly wiring harness and other structural components inside the housing 10 can be observed through the second housing 12 to see if there is any interference or damage. This further increases the observation range, improves the installation efficiency of the battery cell 20 and the housing 10, and simplifies the operation difficulty when installing the battery cell 20 and the housing 10.

[0189] According to some embodiments of this application, the limiting oxygen index of the base plate 111 is greater than or equal to 30%.

[0190] The limiting oxygen index (LOI) is the minimum oxygen concentration required for a material to maintain stable combustion (i.e., flaming combustion) in a nitrogen-oxygen mixture.

[0191] The limiting oxygen index of the base plate 111 being greater than or equal to 30% means that the minimum oxygen concentration required for the base plate 111 to maintain stable combustion (i.e., flaming combustion) in a nitrogen-oxygen mixed gas flow is greater than or equal to 30%.

[0192] In some embodiments, the limiting oxygen index of the frame 112 is greater than or equal to 30%, and / or the minimum oxygen concentration of the second chamber 12 is greater than or equal to 30%.

[0193] In this embodiment, when the limiting oxygen index of the base plate 111 is greater than or equal to 30%, the risk of the base plate 111 burning when the battery cell experiences thermal runaway is reduced, thereby improving the reliability of the battery device 100.

[0194] According to some embodiments of this application, the Vicat softening point of the base plate 111 is greater than or equal to 215°C.

[0195] The Vicat softening point (VSP) is the temperature at which a thermoplastic material, under a specific liquid heat transfer medium and a certain load and uniform heating rate, is pressed into the surface of a sample by a standardized indenter with a cross-sectional area of ​​1 square millimeter to a depth of 1 millimeter.

[0196] In some embodiments, the Vicat softening point of the frame 112 is greater than or equal to 215°C, and / or the Vicat softening point of the second housing 12 is greater than or equal to 215°C.

[0197] In this embodiment, when the Vicat softening point of the base plate is greater than or equal to 215°C, the risk of softening and deformation of the base plate when thermal runaway occurs in a single battery cell is reduced, thereby improving the reliability of the battery device.

[0198] According to some embodiments of this application, the tensile strength of the base plate 111 is greater than or equal to 50 MPa.

[0199] Tensile strength, also known as tensile strength limit, refers to the maximum engineering stress that a material specimen can withstand before fracture under a unidirectional uniform tensile load.

[0200] In some embodiments, the tensile strength of the frame 112 is greater than or equal to 50 MPa, and / or the tensile strength of the second housing 12 is greater than or equal to 50 MPa.

[0201] In this embodiment, when the tensile strength of the base plate is greater than or equal to 50 MPa, the risk of permanent deformation or breakage of the base plate when supporting the battery cell is reduced, so that the housing can provide a reliable working environment for the battery cell, thereby improving the reliability of the battery device.

[0202] According to some embodiments of this application, this application also provides an electrical device, which includes a battery device 100 of any of the above schemes, and the battery device 100 is used to provide electrical energy to the electrical device.

[0203] According to some embodiments of this application, refer to Figures 2 to 17 This application provides a battery device 100, including a battery cell 20 and a housing 10. The housing 10 has a receiving cavity 11A, in which the battery cell 20 is received. The housing 10 includes a bottom plate 111 and a frame 112, which are integrally formed. The bottom plate 111 is disposed at the bottom of the frame 112 and is used to support the battery cell 20. The light transmittance of the bottom plate 111 is greater than or equal to 80%.

[0204] In some embodiments, a thermal management component 50 is provided inside the housing 10. The thermal management component 50 is used to contain fluid to regulate the temperature of a plurality of battery cells 20. A plurality of thermal management components 50 are spaced apart along the length of the housing 10, and at least one battery cell 20 is disposed between two adjacent thermal management components 50. Exemplarily, to increase the contact area between the thermal management component and the battery cell, the thermal management component is disposed on the side of the surface with the largest area of ​​the battery cell 20. The battery device also includes a connecting adhesive 31, which connects the battery cell 20 and the base plate 111.

[0205] In some embodiments, the base plate 111 has a flow channel 111A inside, which is used to contain a heat exchange medium to manage the temperature of the battery cell 20. The base plate 111 has a window 111B, which communicates with the flow channel 111A, and the battery cell 20 covers the window 111B. The battery device 100 also includes a connecting adhesive 31, which surrounds the window 111B and connects the battery cell 20 and the base plate 111.

[0206] In some embodiments, the base plate 111 has a flow channel 111A inside, which is used to contain a heat exchange medium to manage the temperature of the battery cell 20. The base plate 111 includes a body 1111 and a first protrusion 1112. The flow channel 111A is located inside the body 1111. The body 1111 has a first surface 1111A facing the battery cell 20. The first protrusion 1112 is disposed on the first surface 1111A. One end of the window 111B communicates with the flow channel 111A, and the other end of the window 111B extends to the surface of the first protrusion 1112 away from the body 1111. The first protrusion 1112 is used to support the battery cell 20. A seal 30 is disposed around the outer periphery of the first protrusion 1112 and is at least partially located between the battery cell 20 and the body 1111 to seal the battery cell 20 and the body 1111. The seal 30 includes a connecting adhesive 31, which surrounds the outer periphery of the first protrusion 1112. The connecting adhesive 31 is at least partially located between the battery cell 20 and the body 1111, connecting the battery cell 20 and the base plate 111. Alternatively, the seal 30 further includes a sealing ring 32, which surrounds the outer periphery of the first protrusion 1112. The connecting adhesive 31 is also surrounded around the outer periphery of the sealing ring 32, which is at least partially located between the battery cell 20 and the body 1111, and abuts against the battery cell 20 and the body 1111. Or, the seal 30 includes a sealing ring 32, which surrounds the outer periphery of the first protrusion 1112. The sealing ring 32 is at least partially located between the battery cell 20 and the body 1111, and abuts against the battery cell 20 and the body 1111. The connecting adhesive 31 is a photosensitive adhesive.

[0207] In some embodiments, there are multiple battery cells 20, each battery cell 20 having at least one window 111B disposed opposite to each other. The base plate 111 includes a body 1111 and a partition 1113. A flow channel 111A is located within the body 1111. The body 1111 has a first surface 1111A facing the battery cell 20. The partition 1113 is disposed on the first surface 1111A. The partition 1113 and the body 1111 together define multiple receiving spaces 11C, each receiving space 11C receiving at least a portion of at least one battery cell 20. The flow channel 111A is disposed inside the base plate 111 for receiving a heat exchange medium to manage the temperature of the battery cell 20. The base plate 111 has a window 111B communicating with the flow channel 111A. The battery cell 20 covers the window 111B, and each receiving space 11C has at least one window 111B corresponding to it. The base plate 111 also includes a first protrusion 1112, which is disposed on the first surface 1111A and located within the receiving space 11C. One end of the window 111B communicates with the flow channel 111A, and the other end of the window 111B extends to the surface of the first protrusion 1112 away from the body 1111. The first protrusion 1112 is used to support the battery cell 20. Along the thickness direction Z of the body, the size of the partition 1113 is larger than the size of the first protrusion 1112. The housing 10 also includes a reinforcing member 40, which is embedded in the body 1111. In the projection plane perpendicular to the thickness direction Z of the body, the orthographic projection of the reinforcing member 40 is located within the orthographic projection of the partition 1113.

[0208] The enclosure 10 includes a first enclosure 11 and a second enclosure 12. The second enclosure 12 and the first enclosure 11 together form a receiving cavity 11A. The first enclosure 11 includes a frame 112 and a bottom plate 111. The bottom plate 111 is located at the bottom of the frame 112, and the light transmittance of the frame 112 is greater than or equal to 80%. An opening is formed on the side of the frame 112 away from the bottom plate 111, and the second enclosure 12 covers the opening. The light transmittance of the second enclosure 12 is greater than or equal to 80%. The limiting oxygen index of the bottom plate 111 is greater than or equal to 30%, the Vicat softening point of the bottom plate 111 is greater than or equal to 215℃, and the tensile strength of the frame 112 is greater than or equal to 50MPa.

[0209] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0210] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. 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; The housing has a receiving cavity in which the battery cell is received. The housing includes a bottom plate for supporting the battery cell. The base plate has a light transmittance of 80% or more, and the interior of the base plate is provided with a flow channel for containing a heat exchange medium to manage the temperature of the battery cell.

2. The battery device as claimed in claim 1, characterized in that, The base plate is provided with a window, which is connected to the flow channel, and the battery cell covers the window.

3. The battery device as claimed in claim 2, characterized in that, The battery device also includes a seal surrounding the window, the seal being used to seal the battery cell and the base plate.

4. The battery device as claimed in claim 3, characterized in that, The sealant includes a connecting adhesive disposed around the window, the connecting adhesive connecting the battery cell and the base plate.

5. The battery device as claimed in claim 4, characterized in that, The adhesive used for bonding is a photosensitive adhesive.

6. The battery device as claimed in claim 3, characterized in that, The base plate includes a body and a first protrusion. The flow channel is located in the body. The body has a first surface facing the battery cell. The first protrusion is disposed on the first surface. One end of the window communicates with the flow channel. The other end of the window extends to the surface of the first protrusion away from the body. The first protrusion is used to support the battery cell. The sealing element is disposed around the outer periphery of the first protrusion and is at least partially located between the battery cell and the body to seal the battery cell and the body.

7. The battery device as claimed in claim 6, characterized in that, The sealant includes a connecting adhesive that surrounds the outer periphery of the first protrusion, and the connecting adhesive is at least partially located between the battery cell and the body, connecting the battery cell and the base plate.

8. The battery device as claimed in claim 7, characterized in that, The sealing element further includes a sealing ring, which is disposed around the outer periphery of the first protrusion. The adhesive is disposed around the outer periphery of the sealing ring. The sealing ring is at least partially located between the battery cell and the body, and abuts against the battery cell and the body.

9. The battery device as claimed in claim 6, characterized in that, The sealing element includes a sealing ring, which is disposed around the outer periphery of the first protrusion. The sealing ring is at least partially located between the battery cell and the body, and abuts against the battery cell and the body.

10. The battery device as claimed in claim 3, characterized in that, There are multiple battery cells, and each battery cell has at least one window disposed opposite to it.

11. The battery device as claimed in claim 1, characterized in that, The battery device also includes a connecting adhesive that connects the battery cell and the base plate.

12. The battery device as claimed in claim 1, characterized in that, The base plate includes a body and a partition. The body has a first surface facing the battery cell. The partition is disposed on the first surface. The partition and the body together define a plurality of receiving spaces, each receiving space accommodating at least a portion of at least one battery cell.

13. The battery device as claimed in claim 12, characterized in that, The base plate has internal flow channels for containing heat exchange medium to manage the temperature of the battery cells. The base plate is provided with a window, which is connected to the flow channel. The battery cell covers the window, and each of the accommodating spaces is provided with at least one window.

14. The battery device as claimed in claim 13, characterized in that, The base plate also includes a first protrusion, which is disposed on the first surface and located within the receiving space. One end of the window communicates with the flow channel, and the other end of the window extends to the surface of the first protrusion away from the body. The first protrusion is used to support the battery cell. Along the thickness direction of the body, the size of the partition is larger than the size of the first protrusion.

15. The battery device as claimed in claim 12, characterized in that, The housing also includes a reinforcing member, which is embedded in the main body. In a projection plane perpendicular to the thickness direction of the main body, the orthographic projection of the reinforcing member is located within the orthographic projection of the partition.

16. The battery device according to any one of claims 1-15, characterized in that, The enclosure includes a first enclosure and a second enclosure. The second enclosure and the first enclosure together form a receiving cavity. The first enclosure includes a frame and a bottom plate. The bottom plate is disposed at the bottom of the frame. An opening is formed on the side of the frame away from the bottom plate. The second enclosure covers the opening. The frame and the bottom plate are integrally formed.

17. The battery device as claimed in claim 16, characterized in that, The light transmittance of the frame is greater than or equal to 80%.

18. The battery device as claimed in claim 16, characterized in that, The light transmittance of the second enclosure is greater than or equal to 80%.

19. The battery device according to any one of claims 1-15, characterized in that, The limiting oxygen index of the base plate is greater than or equal to 30%.

20. The battery device according to any one of claims 1-15, characterized in that, The Vicat softening point of the base plate is greater than or equal to 215°C.

21. The battery device according to any one of claims 1-15, characterized in that, The tensile strength of the base plate is greater than or equal to 50 MPa.

22. An electrical appliance, characterized in that, The electrical device includes a battery device as described in any one of claims 1-21, the battery device being used to provide electrical energy.

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