Battery device and electric device

Abstract

The application discloses a battery device and a power utilization device. The battery device comprises a box assembly, a battery monomer assembly and a plurality of limiting beam assemblies. The box assembly comprises a first box and a second box arranged along a first direction, and the first box and the second box are connected to form a cavity. The battery monomer assembly is located in the cavity, and comprises a plurality of battery monomers stacked along a second direction. The plurality of limiting beam assemblies are distributed along the second direction at intervals, and the battery monomer assembly is provided with the limiting beam assemblies at both ends along the second direction. The limiting beam assembly comprises a limiting beam and an extension plate connected to each other. The limiting beam is in abutment with the battery monomer. The limiting beam is connected to the first box at least through the extension plate, and at least part of the extension plate is located between the battery monomer and the first box.

Description

Technical Field

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

[0002] In recent years, with the rapid development of new energy technologies, new energy vehicles have been increasingly widely used and are gradually replacing traditional fuel vehicles, becoming one of the mainstream modes of transportation. As the power source of new energy vehicles, the power battery is one of their core components; therefore, the safety performance of the power battery has become a key focus of attention.

[0003] In the development of battery technology, improving the reliability of battery devices is a key research direction. Utility Model Content

[0004] This application provides a battery device and an electrical device that can constrain the expansion of individual battery cells to improve the reliability of individual battery cells.

[0005] In a first aspect, embodiments of this application provide a battery device, including a housing assembly, a battery cell assembly, and a plurality of limiting beam assemblies. The housing assembly includes a first housing and a second housing arranged along a first direction, which are connected to each other to form a cavity. The battery cell assembly is located in the cavity and includes a plurality of battery cells stacked along a second direction. The plurality of limiting beam assemblies are spaced apart along the second direction, and each end of the battery cell assembly along the second direction is provided with a limiting beam assembly. The limiting beam assembly includes a limiting beam and an extension plate connected to each other. The limiting beam abuts against the battery cell, and the limiting beam is connected to the first housing at least through the extension plate. At least a portion of the extension plate is located between the battery cell and the first housing.

[0006] According to the battery device provided in the first aspect of this application, a battery cell assembly is housed within a housing assembly, and the first housing assembly is provided with a limiting beam assembly. The limiting beam assembly is disposed at both ends of the battery cell assembly along the stacking direction of the battery cells to limit the expansion deformation of the battery cell assembly. When a battery cell expands, the limiting beam assembly can first block the expansion deformation of the battery cell and absorb energy to prevent the expansion of the battery cell from directly squeezing the housing assembly and causing bulging deformation of the entire battery device. Specifically, the limiting beam assembly is provided with a limiting beam and an extension plate for connecting the limiting beam and the first housing assembly. At least a portion of the extension plate can extend into the gap between the battery cell assembly and the first housing assembly, increasing the contact area between the limiting beam assembly and the first housing assembly within the limited space inside the housing assembly, thereby improving the connection strength between the limiting beam assembly and the housing assembly and strengthening the constraint effect of the limiting beam on the battery cell assembly.

[0007] In some alternative embodiments, a first recess and a cell bonding surface are formed on the side of the first housing facing the second housing, and at least a portion of the extension plate is located within the first recess such that at least a portion of the surface of the extension plate facing away from the first housing is flush with the cell bonding surface.

[0008] In the above optional embodiments, by creating a first recessed platform, it facilitates the assembly and alignment between the extension plate and the first housing, and allows the limiting beam assembly and the housing assembly to share space in the first direction. This helps control the overall dimensions of the battery device in the first direction and improves the energy density of the battery device. Furthermore, the portion of the extension plate inserted into the first recessed platform remains flush with the cell bonding surface, without affecting the normal assembly between the battery cell assembly and the first housing.

[0009] In some alternative embodiments, a protrusion is formed on the side of the first housing facing the second housing. The protrusion protrudes towards the battery cell relative to the cell bonding surface, abuts against the battery cell, and is filled with colloid between the cell bonding surface and the battery cell.

[0010] In the above optional embodiments, on the one hand, the thickness of the protrusion is increased to provide better support for the battery cell assembly and optimize the load-bearing capacity of the first housing to the battery cell assembly; on the other hand, the protrusion can separate the battery cell and the cell bonding surface, and the gap formed by the gap can be used to fill the adhesive material to achieve bonding between the battery cell and the cell bonding surface, thereby improving the stability of the battery cell assembly in the housing assembly.

[0011] In some alternative embodiments, the extension plate is located between the first housing and at least two battery cells.

[0012] In the above optional embodiments, without increasing the gap between the battery cell assembly and the first housing, the contact area between the extension plate and the first housing can be increased, further enhancing the connection strength between the limiting beam assembly and the housing assembly.

[0013] In some alternative embodiments, the limiting beam assembly is a metal component, at least a portion of the extension plate is located between the limiting beam and the first housing, and the extension plate is welded to the limiting beam.

[0014] In the above optional embodiments, the limiting beam and the extension plate in the limiting beam assembly have better structural strength and better connection strength between them, so as to improve the constraint effect of the limiting beam assembly on the battery cell assembly and the connection strength between the limiting beam assembly and the housing assembly.

[0015] In some alternative embodiments, the first housing is a metal component, and at least one of the extension plate and the limiting beam is welded to the first housing.

[0016] In the above optional embodiments, the structural strength of the first housing itself and the connection strength between the first housing and the limiting beam assembly are improved, thereby strengthening the constraint of the limiting beam on the battery cell assembly.

[0017] In some alternative embodiments, the first housing includes a non-metallic component, and the extension plate is bonded to the non-metallic component, or the extension plate is threaded to the non-metallic component.

[0018] In the above optional embodiments, it helps to reduce the processing cost of the housing components and the weight of the battery device to adapt to different usage scenarios, and the limiting beam can achieve heterogeneous connection with the first housing through the extension plate.

[0019] In some alternative embodiments, the limiting beam includes a flanged structure extending away from the battery cell assembly, with at least a portion of the extension plate located between the flanged structure and the first housing, and the extension plate being welded to the flanged structure.

[0020] In the above optional embodiments, on the one hand, the flange structure can be used to improve the structural strength of the limiting beam itself, so as to improve its constraint effect on the battery cell assembly; on the other hand, the flange structure can provide more welding area to strengthen the connection between the limiting beam and the extension plate, thereby improving the connection strength between the limiting beam and the first box.

[0021] In some optional embodiments, the battery device further includes a thermal management component disposed on the side of the battery cell assembly facing away from the first housing. The battery cell includes a housing, an electrode assembly, and electrode terminals. The electrode assembly is located inside the housing, and the electrode terminals are disposed along a first direction on the side of the housing facing the thermal management component.

[0022] In the above optional embodiments, the thermal management component can be used to dissipate heat or raise the temperature of the battery cell assembly so that the battery cell can operate under suitable temperature conditions. The design of separating the thermal management component from the extension plate can avoid conflict between the extension plate and the thermal management component, while improving the structural stability and heat dissipation performance of the battery device.

[0023] In some alternative embodiments, the thermal management assembly includes a current collector and a heat exchanger disposed on one side of the current collector along a second direction, the heat exchanger contacting and exchanging heat with the housings of multiple battery cells.

[0024] In the above optional embodiments, the current collector can enable the input of the heat exchange medium to the heat exchange element or the collection of the heat exchange medium already exchanged within the heat exchange element, promoting normal flow of the heat exchange medium within the heat exchange element to complete the heat dissipation or temperature rise of the battery cell. When multiple heat exchange elements are provided, the current collector can also be used for the diversion and convergence of heat exchange media within multiple heat exchange elements to optimize the flow distribution within the thermal management component and improve heat exchange performance.

[0025] In some optional embodiments, multiple battery cell assemblies are arranged along a third direction, and multiple heat exchangers are correspondingly arranged. The multiple heat exchangers are spaced apart along the third direction to expose the electrode terminals of the battery cells, and the first direction and the second direction are perpendicular to each other with the third direction.

[0026] In the above optional embodiments, multiple heat exchangers can be respectively configured for multiple battery cell assemblies to improve the uniformity of heat dissipation at different locations within the battery device, reducing the probability of thermal runaway chain reactions caused by localized hot spots within the battery device. Furthermore, the spaced-apart heat exchangers can avoid obstructing the electrode terminals and affecting the electrical connection between battery cells.

[0027] In some alternative embodiments, the thermal management assembly further includes insulation, with insulation provided between the second housing and at least one heat exchanger.

[0028] In the above optional embodiments, the heat insulation component can prevent the heat exchange component from directly contacting the second housing to complete the heat exchange. Taking the heat dissipation process as an example, on the one hand, it avoids affecting the heat exchange between the battery cell and the heat exchange medium, and improves the heat exchange efficiency between the thermal management component and the battery cell assembly; on the other hand, the heat insulation component can prevent the heat exchange medium released to the second housing from causing the housing assembly to heat up.

[0029] In some optional embodiments, the current collector includes a first current collector and a second current collector that are connected to each other but not in communication with each other. The interior of the first current collector forms an inlet flow channel, and the interior of the second current collector forms an outlet flow channel.

[0030] In the above optional embodiments, the first and second collectors, which are not interconnected, can be used to separate the flow of the heat exchange medium to be exchanged and the heat exchanged medium to be exchanged, thereby avoiding the mixing of the two and affecting the heat exchange effect between the heat exchange medium to be exchanged and the battery cell assembly.

[0031] In some alternative embodiments, the limiting beam has a first end and a second end that are opposite to each other along a first direction, the first end facing the first housing and the second end facing the second housing, and the area of ​​the first end is greater than the area of ​​the second end.

[0032] In the above optional embodiments, the limiting beam and the extension plate can form a larger contact area to improve the connection strength, thereby improving the connection strength between the limiting beam and the first housing and strengthening the constraint effect of the limiting beam on the battery cell assembly.

[0033] Secondly, embodiments of this application also provide an electrical device, including the battery device provided in any of the embodiments of the first aspect described above. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of an electrical device according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a battery device according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a battery cell assembly according to an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application; Figure 5 This is an exploded view of a battery device according to an embodiment of this application; Figure 6 This is an exploded structural diagram of the first box body and limiting beam assembly according to an embodiment of this application; Figure 7 This is a schematic diagram showing the connection between the limiting beam assembly and the first box body according to an embodiment of this application; Figure 8 This is a schematic diagram showing the connection between the limiting beam assembly and the first box body according to another embodiment of this application; Figure 9 This is a schematic diagram of the structure of a limiting beam according to an embodiment of this application; Figure 10 This is a schematic diagram showing the connection between the limiting beam assembly and the first box body according to an embodiment of this application; Figure 11 for Figure 10 Enlarged structural diagram at point A; Figure 12 This is a schematic diagram of the structure of a thermal management component according to an embodiment of this application; Figure 13 This is an exploded view of the battery device according to an embodiment of this application.

[0036] The accompanying drawings may not be drawn to scale.

[0037] Explanation of reference numerals in the attached figures: 1000, vehicles; 100. Battery assembly; 200. Controller; 300. Motor; 10. Top cover; 20. Battery cell assembly; 21. Battery cell; 211. Housing; 212. End cap; 213. Electrode assembly; 214. Electrode terminal; 30. Housing; 31. First housing; 311. First recessed platform; 312. Cell bonding surface; 313. Protrusion; 32. Second housing; 33. Filling structure; 40. Limiting beam assembly; 41. Limiting beam; 411. Flanged structure; 412. First end; 413. Second end; 42. Extension plate; 421. Extension section; 50. Thermal management components; 501. Liquid inlet; 502. Liquid outlet; 51. Current collector; 52. Heat exchanger; 521. Sealing plate; 522. Flow channel plate; 53. Liquid inlet component; 54. Liquid outlet component; First direction Z; second direction Y; third direction X. Detailed Implementation

[0038] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0039] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0040] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0041] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" 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. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0042] In this application, "multiple" means two or more (including two).

[0043] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0044] The battery mentioned in the embodiments of this application may be a single physical module comprising one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or mixed via a busbar.

[0045] In some embodiments, the battery can be a battery module; when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0046] In some embodiments, the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0047] 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.

[0048] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0049] A single battery cell typically includes an electrode assembly. The electrode assembly comprises 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, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0050] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0051] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0052] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be made of silver-treated stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0053] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more.

[0054] In some embodiments, the positive electrode can be made of foamed carbon or foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or a foamed alloy, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal may also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0055] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0056] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, silver-surfaced stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium can be used. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0057] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0058] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0059] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0060] In some embodiments, the negative electrode can be made of foamed carbon or foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or foamed alloy, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0061] As an example, lithium source material, potassium metal or sodium metal may also be filled or deposited in the negative electrode current collector, wherein the lithium source material is lithium metal and / or lithium-rich material.

[0062] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0063] In some embodiments, the electrode assembly further includes a separator disposed between the positive and negative electrodes. This application does not impose any particular limitation on the type of separator; any known porous separator with good chemical and mechanical stability can be selected.

[0064] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride, and ceramic.

[0065] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0066] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0067] In some implementations, the electrode assembly is a stacked structure.

[0068] Multiple positive and negative electrodes can be set separately, and multiple positive and multiple negative electrodes can be stacked alternately.

[0069] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0070] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0071] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0072] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0073] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0074] 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.

[0075] To maximize economic benefits, battery devices typically integrate a large number of individual battery cells to achieve high energy density. However, during repeated charging and discharging, the chemical reactions occurring within the individual battery cells cause changes in the lattice parameters of the internal materials, leading to volume changes. Under harsh conditions, side reactions such as electrolyte decomposition can also occur inside the battery cells, generating gases and exacerbating the expansion of the battery cells.

[0076] During long-term use, this expansion repeatedly acts on the structures surrounding the battery cells, such as the casing or frame, leading to fatigue deformation and even cracking. These defects, in turn, cause displacement of the battery cells, resulting in breakage or poor connection of components such as the tabs or contacts, or even internal short circuits that trigger a thermal runaway chain reaction. Furthermore, as the number of battery cells inside the battery pack increases, this combined force multiplies or even increases exponentially.

[0077] Therefore, it is necessary to constrain the expansion of individual battery cells to ensure the safe use of battery devices and electrical appliances.

[0078] To address the aforementioned technical problems, this application provides a battery device and an electrical device. The battery device includes a housing assembly and battery cell assemblies housed within the housing assembly. Each battery cell assembly has a limiting beam assembly at both ends along the battery cell stacking direction. The limiting beam assembly includes a limiting beam and an extension plate for connecting the limiting beam to the housing assembly. The limiting beam limits the deformation of the battery cell assembly in the battery cell stacking direction, while the extension plate increases the contact area between the limiting beam assembly and the housing assembly to improve connection strength, thus enhancing the stability of the limiting beam acting on the battery cell assembly. Furthermore, at least a portion of the extension plate can be accommodated between the battery cell and the housing assembly, reducing the negative impact of adding the extension plate on the integration and energy density of the battery device.

[0079] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0080] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0081] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0082] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 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, and 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 power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

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

[0084] Please refer to Figure 2 , Figure 2This is an exploded view of the apparatus provided in some embodiments of this application. The battery device 100 includes a battery housing and a battery cell assembly 20. In some embodiments, the battery housing may include a top cover 10 and a housing 30, with the top cover 10 and the housing 30 covering each other, and the top cover 10 and the housing 30 together defining a receiving cavity for accommodating the battery cell assembly 20. The housing 30 may be a hollow structure with one end open, and the top cover 10 may be a plate-like structure, with the top cover 10 covering the open side of the housing 30 so that the top cover 10 and the housing 30 together define the receiving cavity; the top cover 10 and the housing 30 may also be hollow structures with one side open, with the open side of the top cover 10 covering the open side of the housing 30. Of course, the battery housing formed by the top cover 10 and the housing 30 can be of various shapes, such as a cylinder, a cuboid, etc.

[0085] Figure 3 This is a schematic diagram of the structure of a battery module according to some embodiments of this application. The battery cell assembly 20 includes multiple battery cells 21, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that some of the battery cells 21 are connected in series and others in parallel. The multiple battery cells 21 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 21 is housed in a casing. Alternatively, the battery device 100 can also be formed by first connecting multiple battery cells 21 in series, parallel, or in a mixed configuration to form a battery module, and then connecting multiple battery modules in series, parallel, or in a mixed configuration to form a whole, which is then housed in a casing. The battery device 100 may also include other structures; for example, the battery device 100 may also include a busbar component for realizing electrical connections between the multiple battery cells 21.

[0086] Each battery cell 21 can be a secondary battery cell or a primary battery cell; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited to these. The battery cell 21 can be cylindrical, flat, cuboid, or other shapes.

[0087] Figure 4This is an exploded structural diagram of a battery cell according to some embodiments of this application. The end cap 212 is a component that covers the opening of the housing 211 to isolate the internal environment of the battery cell 21 from the external environment. Not limited to this, the shape of the end cap 212 can be adapted to the shape of the housing 211 to fit it. Optionally, the end cap 212 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 212 is less prone to deformation under pressure and impact, enabling the battery cell 21 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 214 can be provided on the end cap 212. The electrode terminals 214 can be used for electrical connection with the electrode assembly 213 for outputting or inputting electrical energy from the battery cell 21. In some embodiments, the end cap 212 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 21 reaches a threshold. The end cap 212 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 212. The insulating element can be used to isolate the electrical connection components in the housing 211 from the end cap 212 to reduce the risk of short circuit. For example, the insulating element can be plastic, rubber, etc.

[0088] Please refer to the following: Figures 5 to 13 In one aspect, embodiments of this application provide a battery device, including a housing assembly, a battery cell assembly 20, and multiple limiting beam assemblies 40. (See firstly...) Figure 5 The housing assembly includes a first housing 31 and a second housing 32 arranged along a first direction Z, and the first housing 31 and the second housing 32 are connected to each other to form a cavity; the battery cell assembly 20 is located in the cavity, and the battery cell assembly 20 includes a plurality of battery cells 21 stacked along a second direction Y; a plurality of limiting beam assemblies 40 are distributed at intervals along the second direction Y, and the battery cell assembly 20 is provided with limiting beam assemblies 40 at both ends along the second direction Y; wherein, the limiting beam assembly 40 includes a limiting beam 41 and an extension plate 42 connected to each other, the limiting beam 41 abuts against the battery cell 21, the limiting beam 41 is connected to the first housing 31 at least through the extension plate 42, and at least a portion of the extension plate 42 is located between the battery cell 21 and the first housing 31.

[0089] For example, the first direction Z can be the height direction of the battery cell 21, and the second direction Y can be the thickness direction of the battery cell 21. The following embodiments may also involve a third direction X, which can be the width direction of the battery cell 21, and the first direction Z, the second direction Y and the third direction X are perpendicular to each other.

[0090] There can be one or more battery cell modules 20, for example, multiple battery cell modules 20 are arranged sequentially along a third direction X. When multiple battery cell modules 20 are provided, each battery cell module 20 is provided with limit beam components 40 at both ends along the second direction Y, so as to constrain all battery cell modules 20 and suppress the expansion trend.

[0091] Optionally, the first housing 31 and the second housing 32 are interlocked to form a cavity, or one of the first housing 31 and the second housing 32 is placed over the other to form a cavity.

[0092] Optionally, the first housing 31 and the second housing 32 are connected by a threaded connector. Alternatively, the first housing 31 and the second housing 32 are detachably connected by other connectors.

[0093] Optionally, the limiting beam 41 is connected to the first box 31, and the limiting beam 41 is connected to the first box 31 through the extension plate 42 to further improve the connection strength between the limiting beam 41 and the first box 31.

[0094] Alternatively, the limiting beam 41 may be welded to the first box 31, or the limiting beam 41 may be plugged into the first box 31, or the limiting beam 41 may be pinned to the first box 31.

[0095] Optionally, the limiting beam 41 is connected to the first box body 31 only through the extension plate 42.

[0096] According to the battery device provided in the first aspect embodiment of this application, a battery cell assembly 20 is housed within a housing assembly, and a first housing 31 is provided with a limiting beam assembly 40. The limiting beam assembly 40 is disposed at both ends of the battery cell assembly 20 along the stacking direction of the battery cells 21 to limit the expansion deformation of the battery cell assembly 20. When the battery cell 21 expands, the limiting beam assembly 40 can first block the expansion deformation of the battery cell 21 and absorb energy to prevent the expansion of the battery cell 21 from directly compressing the housing assembly and causing bulging deformation of the entire battery device. Even if the limiting beam assembly 40 ultimately fails to limit the expansion of the battery cell assembly 20, it can still absorb some kinetic energy during the blocking process to reduce the pressure exerted by the expanded battery cell assembly 20 on the housing assembly, thereby reducing the degree of damage to the battery device.

[0097] Specifically, the limiting beam assembly 40 is provided with a limiting beam 41 and an extension plate 42 for connecting the limiting beam 41 and the first housing 31. At least a portion of the extension plate 42 can extend into the gap between the battery cell assembly 20 and the first housing 31, increasing the contact area between the limiting beam assembly 40 and the first housing 31 within the limited space inside the housing assembly, thereby improving the connection strength between the limiting beam assembly 40 and the housing assembly and strengthening the constraint effect of the limiting beam 41 on the battery cell assembly 20.

[0098] Please see Figure 6 , Figure 10 as well as Figure 11 According to some embodiments of the first aspect of this application, a first recessed platform 311 and a cell bonding surface 312 are formed on the side of the first housing 31 facing the second housing 32, and at least a portion of the extension plate 42 is located in the first recessed platform 311 such that at least a portion of the surface of the extension plate 42 facing away from the first housing 31 is flush with the cell bonding surface 312.

[0099] Among them, the cell bonding surface 312 refers to the wall surface used to bond the first housing 31 to the battery cell assembly 20. It can be a structure with bonding capability or a structure used to support adhesive materials.

[0100] It can be understood that the first recessed platform 311 refers to the recessed structure that is recessed relative to the cell bonding surface 312, and the depth of the first recessed platform 311 is less than or equal to the size setting of the extension plate 42 in the second direction Y.

[0101] Optionally, all extension plates 42 are located within the first recessed platform 311, and the load applied by the limiting beam assembly 40 to the first box 31 through the first recessed platform 311 is more evenly distributed, thereby improving the connection strength and stability between the limiting beam assembly 40 and the box assembly.

[0102] Optionally, the surface of the extension plate 42 facing away from the first housing 31 includes a first wall and a second wall. The first wall protrudes relative to the second wall. The first wall is used to connect the limiting beam 41, and the second wall is flush with the cell bonding surface 312 to support the battery cell 21. When the battery cell 21 expands, the protruding part can shorten the distance between the expansion stress on the limiting beam 41 and the lever arm distance between the limiting beam 41 and the fixed end of the extension plate 42, thereby improving the shear resistance of the limiting beam 41 and enhancing the stable constraint effect of the limiting beam 41 on the battery cell assembly 20.

[0103] Alternatively, the entire surface of the extension plate 42 facing away from the first housing 31 is flush with the cell bonding surface 312 to reduce the difficulty of assembly and alignment between the extension plate 42 and the first housing 31.

[0104] Therefore, by creating the first recessed platform 311, on the one hand, it facilitates the assembly and alignment between the extension plate 42 and the first housing 31; on the other hand, it allows the limiting beam assembly 40 and the housing assembly to share space in the first direction Z, which helps control the overall size of the battery device in the first direction Z and improves the energy density of the battery device. Furthermore, the portion of the extension plate 42 inserted into the first recessed platform 311 can remain flush with the cell bonding surface 312 without affecting the normal assembly between the battery cell assembly 20 and the first housing 31.

[0105] According to some embodiments of the first aspect of this application, a protrusion 313 is formed on the side of the first housing 31 facing the second housing 32. The protrusion 313 protrudes towards the battery cell 21 relative to the cell bonding surface 312. The protrusion 313 abuts against the battery cell 21. The space between the cell bonding surface 312 and the battery cell 21 is filled with colloid.

[0106] Optionally, the thickness of the raised area 313 is the same as the thickness of the cell bonding surface 312, and the raised area 313 is formed by stamping.

[0107] Optionally, the thickness of the raised area 313 is greater than the thickness of the cell bonding surface 312.

[0108] Optionally, the protrusion 313 extends along the second direction Y to provide support for a plurality of battery cells 21 within the battery cell assembly 20.

[0109] Alternatively, each battery cell 21 in the same battery cell assembly 20 is in contact with the protrusion 313.

[0110] Alternatively, the protrusion 313 may be continuously arranged along the second direction Y.

[0111] Alternatively, some of the battery cells 21 in the same battery cell assembly 20 may contact the protrusion 313.

[0112] Optionally, when there are multiple battery cell modules 20, there are correspondingly multiple protrusions 313.

[0113] Alternatively, each battery cell assembly 20 is provided with a protrusion 313 between itself and the first housing 31, and the battery cell assembly 20 covers the protrusion 313, so that the cell bonding surface 312 located between two adjacent protrusions 313 can form a larger bonding area with the battery cell assembly 20, thereby improving the bonding stability between the battery cell 21 and the first housing 31.

[0114] Alternatively, the protrusion 313 is disposed between two adjacent battery cell modules 20, and each battery cell module 20 is provided with a protrusion 313 at both ends along the third direction X, so as to improve the load-bearing effect of the protrusion 313 on the battery cell module 20.

[0115] Optionally, the adhesive filling the space between the cell bonding surface 312 and the battery cell 21 can be a full-layer adhesive or a flowing adhesive filling the space between the battery cell assembly 20 and the first housing 31.

[0116] Optionally, please refer to Figure 8The extension plate 42 includes an extension portion 421 extending away from the limiting beam 41. The extension portion 421 can contact the cell bonding surface 312 to further increase the contact area between the limiting beam assembly 40 and the housing assembly.

[0117] Therefore, on the one hand, the increased thickness of the protrusion 313 provides better support for the battery cell assembly 20, optimizing the load-bearing capacity of the first housing 31 on the battery cell assembly 20; on the other hand, the protrusion 313 can separate the battery cell 21 from the cell bonding surface 312, and the gap formed by the gap can be used to fill the adhesive material to achieve bonding between the battery cell 21 and the cell bonding surface 312, improving the stability of the battery cell assembly 20 within the housing assembly.

[0118] According to some embodiments of the first aspect of this application, the extension plate 42 is located between the first housing 31 and at least two battery cells 21.

[0119] Optionally, the battery cell assembly 20 is connected to the housing assembly via an extension plate 42. Specifically, the surface of the extension plate 42 facing away from the first housing 31 is bonded and fixed to the battery cell 21.

[0120] Optionally, the extension plate 42 is located between the first housing 31 and half of the battery cells 21 in the same battery cell assembly 20. The battery cell assembly 20 has limit beam assemblies 40 at both ends in the stacking direction of the battery cells 21. This ensures that the extension plates 42 of both limit beam assemblies 40 form the maximum contact area with the first housing 31 to improve connection strength, and the connection strength between the two limit beam assemblies 40 and the housing assembly tends to be consistent, thereby preventing one of the limit beams 41 from failing first.

[0121] Alternatively, please refer to Figure 7 Along the third direction X, the extension plate 42 is integrally set inside the first housing 31 and is bonded and fixed to all battery cell assemblies 20.

[0122] Optionally, the extension plate 42 includes a plurality of extension portions 421 spaced apart along a third direction X, with a boss between two adjacent extension portions 421 to support the battery cell 21. The extension portions 421 are arranged in a one-to-one correspondence with the battery cell assembly 20, or the extension portions 421 are disposed between two adjacent battery cell assemblies 20.

[0123] Therefore, without increasing the gap between the battery cell assembly 20 and the first housing 31, the contact area between the extension plate 42 and the first housing 31 can be increased, further enhancing the connection strength between the limiting beam assembly 40 and the housing assembly.

[0124] According to some embodiments of the first aspect of this application, the limiting beam assembly 40 is a metal part, and at least a portion of the extension plate 42 is located between the limiting beam 41 and the first box 31.

[0125] Optionally, the limiting beam 41 is welded to the extension plate 42 to improve the connection strength between the limiting beam 41 and the extension plate 42.

[0126] Optionally, the limiting beam assembly 40 includes at least one of iron, aluminum, copper, and steel.

[0127] Alternatively, the limiting beam 41 and the extension plate 42 may be made of the same material to facilitate their connection.

[0128] Alternatively, the limiting beam 41 and the extension plate 42 can be an integral structure. For example, the limiting beam 41 and the extension plate 42 can be integrally formed by a casting process to further improve the overall structural strength of the limiting beam 41 and the extension plate 42 and reduce the probability of cracking or other defects at the connection.

[0129] Alternatively, the limiting beam 41 and the extension plate 42 may be made of different materials to control costs or to specifically compensate for the structural strength of one of them.

[0130] Therefore, the structural strength of the limiting beam 41 and the extension plate 42 in the limiting beam assembly 40 is better, and the connection strength between the two is better, so as to improve the constraint effect of the limiting beam assembly 40 on the battery cell assembly 20 and the connection strength between the limiting beam assembly 40 and the box assembly.

[0131] According to some embodiments of the first aspect of this application, the first housing 31 is a metal part, and at least one of the extension plate 42 and the limiting beam 41 is welded to the first housing 31.

[0132] Optionally, the limiting beam 41 is welded to the first box body 31.

[0133] Optionally, the extension plate 42 is bonded and fixed to the first housing 31.

[0134] Optionally, the extension plate 42 is welded to the first housing 31.

[0135] Optionally, the first housing 31 may be made of at least one of iron, aluminum, copper, or steel.

[0136] Alternatively, the first housing 31 and the limiting beam assembly 40 are made of the same material, which facilitates the connection between the two and eliminates the difference in the coefficient of thermal expansion between them, so as to prevent defects such as cracking of the weld at the connection when heated.

[0137] Alternatively, the materials of at least one of the first box body 31, the extension plate 42, and the limiting beam 41 may be different in order to control costs or to make targeted compensation for the strength of one of the structures.

[0138] As a result, the structural strength of the first housing 31 itself and the connection strength between the first housing 31 and the limiting beam assembly 40 are improved, and the constraint of the limiting beam 41 on the battery cell assembly 20 is strengthened.

[0139] According to some embodiments of the first aspect of this application, the first housing 31 includes non-metallic components.

[0140] Optionally, the first housing 31 may be entirely made of non-metallic components.

[0141] Optionally, the first housing 31 includes both metallic and non-metallic components. Specifically, at least the wall of the first housing 31 facing the battery cell assembly 20 is a non-metallic component.

[0142] Optionally, the non-metallic component includes at least one of epoxy resin, polyurethane, and polyphenylene sulfide.

[0143] Optionally, the extension plate 42 is bonded and fixed to the non-metallic part.

[0144] Optionally, the extension plate 42 is threaded to a non-metallic component.

[0145] This helps reduce the processing cost of the housing components and the weight of the battery device to adapt to different usage scenarios. The limiting beam 41 can achieve a heterogeneous connection with the first housing 31 through the extension plate 42.

[0146] According to some embodiments of the first aspect of this application, the second housing 32 is made of the same material as the first housing 31 to facilitate the connection between the two and eliminate the difference in the coefficient of thermal expansion between them, so as to prevent the formation of gaps at the connection between the two from affecting the airtightness or sealing performance of the housing assembly.

[0147] According to some embodiments of the first aspect of this application, the second housing 32 is made of a different material than the first housing 31. For example, the first housing 31 is a metal component and the second housing 32 is a non-metallic component, or the first housing 31 is a non-metallic component and the second housing 32 is a metal component. Thus, the housing assembly can improve the structural strength and impact resistance in certain directions to specifically create a reinforcing effect.

[0148] Please see Figure 9 According to some embodiments of the first aspect of this application, the limiting beam 41 includes a flange structure 411 extending away from the battery cell assembly 20, and at least a portion of the extension plate 42 is located between the flange structure 411 and the first housing 31.

[0149] Optionally, the extension plate 42 is welded to the flange structure 411.

[0150] Optionally, the flange structure 411 is threadedly connected to the extension plate 42.

[0151] Optionally, the limiting beam 41 is also provided with a flange structure 411 on the side facing the battery cell assembly 20 to further enhance the connection strength between the limiting beam 41 and the extension plate 42.

[0152] Therefore, on the one hand, the flange structure 411 can be used to improve the structural strength of the limiting beam 41 itself, so as to improve its constraint effect on the battery cell assembly 20; on the other hand, the flange structure 411 can provide more welding area to strengthen the connection between the limiting beam 41 and the extension plate 42, thereby improving the connection strength between the limiting beam 41 and the first box 31.

[0153] According to some embodiments of the first aspect of this application, a side rib is provided between the limiting beam 41 and the extension plate 42.

[0154] Specifically, the side ribs are disposed on the side of the limiting beam 41 opposite to the battery cell assembly 20. For example, the battery device includes a high-voltage box for controlling and distributing the voltage of multiple battery cells 21. The side ribs and the high-voltage box are spaced apart along a first direction Z between the first housing 31 and the second housing 32. Alternatively, the high-voltage box is disposed along a third direction X between two adjacent side ribs to fully utilize the internal space of the battery device and reduce the negative impact of adding side ribs on the energy density of the battery device.

[0155] Optionally, the side rib is welded to the limiting beam 41, or the side rib is threaded to the limiting beam 41.

[0156] Alternatively, the side ribs are welded to the extension plate 42, or the side ribs are threaded to the extension plate 42.

[0157] Therefore, by providing side ribs, the restraining effect of the limiting beam 41 on the battery cell assembly 20 can be enhanced to strengthen the constraint. Furthermore, the side ribs can increase the contact area between the limiting beam 41 and the extension plate 42 to improve the connection strength between the limiting beam 41 and the extension plate 42.

[0158] Please see Figure 12 and Figure 13 According to some embodiments of the first aspect of this application, the battery device further includes a thermal management component 50, which is disposed on the side of the battery cell assembly 20 away from the first housing 31. The battery cell 21 includes a housing 211, an electrode assembly and an electrode terminal. The electrode assembly is located inside the housing 211, and the electrode terminal is disposed along the first direction Z on the side of the housing 211 facing the thermal management component 50.

[0159] Optionally, the thermal management component 50 covers all battery cells 21 within the same battery cell assembly 20, or the thermal management component 50 covers some of the battery cells 21 within the same battery cell assembly 20.

[0160] Optionally, the thermal management component 50 is installed in the second housing 32. When the battery device is in use, the second housing 32 is assembled into the first housing 31, and the thermal management component 50 can exchange heat with the battery cell assembly 20.

[0161] Optionally, the thermal management component 50 is connected to the first housing 31. Specifically, the thermal management component 50 is directly connected to the first housing 31, or the thermal management component 50 is connected to the first housing 31 via the battery cell assembly 20.

[0162] Therefore, the thermal management component 50 can be used to dissipate heat or raise the temperature of the battery cell assembly 20 so that the battery cell 21 can operate under suitable temperature conditions. The design of separating the thermal management component 50 from the extension plate 42 can avoid conflict between the extension plate 42 and the thermal management component 50, while improving the structural stability and heat dissipation performance of the battery device.

[0163] According to some embodiments of the first aspect of this application, the thermal management assembly 50 includes a current collector 51 and a heat exchange element 52 disposed on one side of the current collector 51 along a second direction Y.

[0164] Specifically, the heat exchanger 52 has a heat exchange channel, and the current collector 51 is provided with an inlet 501 and an outlet 502. The heat exchange channel can communicate with the current collector 51 to realize the continuous flow of the heat exchange medium in the thermal management component 50, which can remove the heat released by the battery cell 21 during charging and discharging or raise the battery cell 21 to a suitable operating temperature.

[0165] Optionally, the heat exchanger 52 contacts the end cap 212 of the battery cell 21 for heat exchange.

[0166] Optionally, the heat exchanger 52 is disposed between two adjacent battery cell assemblies 20, and the heat exchanger 52 contacts the side wall of the housing 211 of the battery cell 21 for heat exchange.

[0167] Optionally, the heat exchanger 52 includes a sealing plate 521 that contacts the battery cell 21 and a flow channel plate 522 disposed on the side away from the battery cell 21. The sealing plate 521 and the flow channel plate 522 close to form a heat exchange flow channel.

[0168] Alternatively, the runner plate 522 may be a stamped part.

[0169] Alternatively, the sealing plate 521 may be bonded to the flow channel plate 522, or the sealing plate 521 may be brazed to the flow channel plate 522.

[0170] Therefore, the current collector 51 can realize the input of the heat exchange medium to be exchanged into the heat exchange element 52 or the collection of the heat exchange medium already exchanged in the heat exchange element 52, so as to promote the normal flow of the heat exchange medium in the heat exchange element 52 to complete the heat dissipation or temperature rise of the battery cell 21. When multiple heat exchange elements 52 are provided, the current collector 51 can also be used for the diversion and convergence of heat exchange media in multiple heat exchange elements 52 to optimize the flow distribution in the thermal management component 50 and improve the heat exchange performance.

[0171] According to some embodiments of the first aspect of this application, a plurality of battery cell modules 20 are provided along a third direction X, and a plurality of heat exchangers 52 are correspondingly provided, with the plurality of heat exchangers 52 spaced apart along a third direction X.

[0172] Optionally, the gap between two adjacent heat exchangers 52 can be used to expose the electrode terminals of the battery cell 21, which can avoid obstructing the electrode terminals and affecting the electrical connection between the battery cells 21.

[0173] Optionally, the end cap 212 of the battery cell 21 is provided with a pressure relief mechanism, such as a pressure relief valve. The gap between two adjacent heat exchange components 52 can be used to expose the pressure relief mechanism of the battery cell 21 to improve the safety of the battery cell 21.

[0174] Optionally, a heat exchanger 52 is disposed between two adjacent battery cell assemblies 20 along a third direction X, and the heat exchanger 52 contacts the shoulder of the battery cell 21 for heat exchange. Alternatively, the number of heat exchangers 52 may be one less than the number of battery cell assemblies 20, and the heat exchanger 52 only exchanges heat at the connection point of adjacent battery cell assemblies 20. Or, the number of heat exchangers 52 may be one more than the number of battery cell assemblies 20, and both shoulder locations of each battery cell assembly 20 can contact the heat exchanger 52 for heat exchange.

[0175] Optionally, the heat exchanger 52 is provided in a one-to-one correspondence with the battery cell assembly 20 to improve the heat exchange efficiency of the battery device.

[0176] Optionally, the flow rate of each heat exchanger 52 is the same, so that the heat exchange effect of each battery cell assembly 20 in the battery device tends to be the same, reducing the probability of local hot spots appearing inside the battery device.

[0177] Optionally, the flow rates of at least two heat exchangers 52 are set differently to provide targeted heat exchange compensation for some of the battery cell components 20 within the battery device, thereby improving the temperature consistency of each battery cell component 20 within the battery device.

[0178] Therefore, multiple heat exchangers 52 can be respectively set for multiple battery cell modules 20 to improve the uniformity of heat dissipation at different locations within the battery device and reduce the probability of thermal runaway chain reaction caused by local hot spots within the battery device.

[0179] According to some embodiments of the first aspect of this application, at least one end of the heat exchanger 52 along the second direction Y is connected to the limiting beam assembly 40.

[0180] Optionally, the heat exchanger 52 is detachably connected to the limiting beam assembly 40 to facilitate the separation of the heat exchanger 52 and the limiting beam assembly 40 for operations such as replacement and maintenance of the battery cell assembly 20. For example, the heat exchanger 52 and the limiting beam 41 are threadedly connected.

[0181] Optionally, the heat exchanger 52 is bonded to the limiting beam assembly 40, or the heat exchanger 52 is welded to the limiting beam assembly 40.

[0182] As a result, the connection stability between the heat exchanger 52 and the battery cell assembly 20 is improved, further enhancing the heat exchange performance and structural stability of the battery device.

[0183] According to some embodiments of the first aspect of this application, the thermal management assembly 50 further includes a heat insulation element, and the heat insulation element is disposed between the second housing 32 and at least one heat exchange element 52.

[0184] Optionally, the heat insulation component is connected and fixed to the heat exchange component 52, or the heat insulation component is connected and fixed to the second housing 32.

[0185] Optionally, the heat exchanger 52 is connected and fixed to the second housing 32 by a heat insulation component.

[0186] Alternatively, the heat insulation component may be bonded to the second housing 32, or bonded to or welded to the heat exchange component 52.

[0187] Optionally, the heat insulation element is disposed across the entire surface between the heat exchange element 52 and the second housing 32.

[0188] Optionally, multiple insulation elements are provided at intervals along the third direction X, and the insulation elements are provided in a one-to-one correspondence with the heat exchange elements 52.

[0189] Alternatively, the insulation element may be provided to cover the heat exchange element 52 to prevent the heat exchange element 52 from directly exchanging heat with the second housing 32.

[0190] Therefore, the heat insulation component can prevent the heat exchange component 52 from directly contacting the second housing 32 to complete the heat exchange. Taking the heat dissipation process as an example, on the one hand, it avoids affecting the heat exchange between the battery cell 21 and the heat exchange medium, and improves the heat exchange efficiency between the thermal management component 50 and the battery cell assembly 20; on the other hand, the heat insulation component can prevent the heat exchange medium released to the second housing 32, causing the housing assembly to heat up.

[0191] According to some embodiments of the first aspect of this application, the current collector 51 includes a first current collector and a second current collector that are connected to each other but not in communication with each other. The interior of the first current collector forms an inlet flow channel, and the interior of the second current collector forms an outlet flow channel.

[0192] Optionally, the first and second collection sections are integrated into one structure. The first collection section has an inlet 501 and at least one first flow port, and the second collection section has an outlet 502 and at least one second flow port. The heat exchanger 52 is connected to the first and second collection sections through the first and second flow ports, respectively.

[0193] Optionally, the current collector 51 includes a first plate, a second plate, and a third plate stacked along a first direction Z. The first plate and the second plate form a first current collector, and the second plate and the third plate form a second current collector. The first current collector and the second current collector are separated from each other by the second plate and are not in communication. Exemplarily, the heat exchanger 52 is directly connected to the first current collector, and the heat exchanger 52 has through holes to connect to the second current collector.

[0194] Optionally, the liquid inlet 501 and the liquid outlet 502 are respectively located on both sides of the collector 51 along the third direction X, and the flow direction of the heat exchange medium in the liquid inlet manifold is opposite to the flow direction of the heat exchange medium in the liquid outlet manifold.

[0195] Alternatively, the liquid inlet 501 and the liquid outlet 502 are disposed on the same side of the thermal management component 50 along the second direction Y.

[0196] Alternatively, the inlet 501 and the outlet 502 are located on one side of the collector 51.

[0197] Alternatively, the thermal management component 50 may further include a liquid inlet 53 and a liquid outlet 54, which are respectively disposed on both sides of the heat exchange component 52 along a third direction X. The liquid inlet 501 and the first collection portion are disposed on both sides of the liquid inlet 53 along a second direction Y, and the liquid outlet 502 and the second collection portion are disposed on both sides of the liquid outlet 54 along a second direction Y.

[0198] Alternatively, the liquid inlet and liquid outlet 502 are respectively located on both sides of the thermal management component 50 along the second direction Y.

[0199] Therefore, the first and second collectors, which are not connected to each other, can be used to separate the flow of the medium to be exchanged and the medium that has already been exchanged, thus avoiding the mixing of the two and affecting the heat exchange effect between the medium to be exchanged and the battery cell assembly 20.

[0200] Please see Figure 9According to some embodiments of the first aspect of this application, the limiting beam 41 has a first end 412 and a second end 413 that are opposite to each other along a first direction Z. The first end 412 faces the first box 31, and the second end 413 faces the second box 32. The area of ​​the first end 412 is larger than the area of ​​the second end 413.

[0201] Optionally, the side of the first end 412 facing the battery cell assembly 20 is flush with the side of the second end 413 facing the battery cell assembly 20, so that the wall surface of the limiting beam 41 facing the battery cell assembly 20 is formed as a plane, providing more contact area between the limiting beam 41 and the battery cell 21 to disperse expansion stress and reduce the probability of the limiting beam 41 deforming under the pressure of the battery cell assembly 20. Correspondingly, the side of the first end 412 facing away from the battery cell assembly 20 protrudes relative to the side of the second end 413 facing away from the battery cell assembly 20, so that the dimension of the first end 412 in the second direction Y is larger than the dimension of the second end 413 in the second direction Y, forming more contact area between the limiting beam 41 and the extension plate 42, improving the connection strength between the limiting beam 41 and the extension plate 42 support, and enhancing the constraint effect of the limiting beam assembly 40 on the battery cell assembly 20.

[0202] Optionally, along the second direction Y, both sides of the first end 412 of the limiting beam 41 protrude relative to both sides of the second end 413, so as to further improve the connection stability between the limiting beam 41 and the extension plate 42.

[0203] Therefore, the limiting beam 41 and the extension plate 42 can form a larger contact area to improve the connection strength, thereby improving the connection strength between the limiting beam 41 and the first housing 31 and strengthening the constraint effect of the limiting beam 41 on the battery cell assembly 20.

[0204] Please see Figure 13 According to some embodiments of the first aspect of this application, the battery device further includes a filling structure 33, which is sandwiched between the battery cell assembly 20 and the housing assembly along a third direction X.

[0205] Optionally, the filling structure 33 is sandwiched between the battery cell assembly 20 and the first housing 31 along the third direction X, or the filling structure 33 is sandwiched between the battery cell assembly 20 and the second housing 32 along the third direction X.

[0206] Optionally, two filling structures 33 are provided, with the two filling structures 33 respectively disposed on both sides of the multiple battery cell modules 20 along the third direction X.

[0207] Optionally, the filling structure 33 may be made of a foam material. For example, the filling structure 33 may be made of foam adhesive.

[0208] Optionally, the filling structure 33 may be made of a porous material. For example, the filling structure 33 may be made of a sponge.

[0209] Optionally, the filling structure 33 may be made of an elastic material. For example, the filling structure 33 may be made of rubber or silicone.

[0210] Optionally, the filling structure 33 may be made of flame-retardant material.

[0211] Therefore, the filling structure 33 can be used to fill the gap between the battery cell assembly 20 and the housing assembly to prevent the battery cell assembly 20 from shifting in the third direction X, thereby improving the positional stability of the battery cell assembly 20 within the housing assembly.

[0212] Secondly, embodiments of this application provide an electrical device, which includes the battery device provided in any embodiment of the first aspect. The battery device is used to provide electrical energy.

[0213] The power device provided in this application embodiment has the same technical effect as the battery device provided in the above embodiment, and will not be described again here.

[0214] For ease of understanding, the specific embodiments shown in the accompanying drawings of this application are explained below.

[0215] Please see Figure 13 This application provides a battery device including a battery cell assembly 20, a housing assembly, and a limiting beam assembly 40. The housing assembly is interconnected to form a first housing 31 and a second housing 32, which form a cavity. The limiting beam assembly 40 is disposed within the cavity along with the battery cell assembly 20. The limiting beam assembly 40 is located at both ends of the battery cell assembly 20 along the stacking direction of the battery cells 21. The limiting beam assembly 40 is fixedly connected to the first housing 31 in the housing assembly to prevent the battery cell assembly 20 from expanding, thereby reducing the risk of thermal runaway due to the expansion and displacement of the battery cells 21 and improving the reliability of the battery device.

[0216] Please refer to Figure 6 , Figure 7 as well as Figure 10 The first housing 31, facing the battery cell assembly 20, is provided with a first recessed platform 311, a protrusion 313, and a cell bonding surface 312. The first recessed platform 311 and the cell bonding surface 312 are separated along the second direction Y, and the cell bonding surface 312 and the protrusion 313 are staggered along the third direction X. An extension plate 42 is disposed within the first recessed platform 311 such that the surface of the extension plate 42 facing away from the first housing 31 is flush with the cell bonding surface 312. The battery cell assembly 20 is disposed above the protrusion 313, and an adhesive is provided between the battery cell assembly 20 and the support of the cell bonding surface 312 to fix the battery cell assembly 20 to the first housing 31.

[0217] Specifically, the extension plate 42 is a metal component, and the first housing 31 is a plastic housing. The extension plate 42 is bonded and fixed inside the first recessed platform 311. To increase the bonding area between the extension plate 42 and the first housing 31, please refer to [link to relevant documentation]. Figure 11 The extension plate 42 extends into the gap between the battery cell assembly 20 and the first housing 31 and covers the battery cell 21 closest to the limiting beam assembly 40 and the second battery cell 21 closest to the limiting beam assembly 40 in the battery cell assembly 20.

[0218] The limiting beam 41 is also a metal component, and it is welded and fixed to the extension plate 42. Please refer to [link / reference]. Figure 9 Along the first direction Z, the limiting beam 41 has a first end 412 close to the first housing 31 and a second end 413 away from the first housing 31. The area of ​​the first end 412 is larger than the area of ​​the second end 413. The first end 412 is also provided with a flange structure 411 extending away from the battery cell assembly 20. The flange structure 411 and the first end 412 together increase the contact area and welding strength between the limiting beam 41 and the extension plate 42, which greatly improves the structural strength of the limiting beam assembly 40 itself, so as to strengthen the constraint effect of the limiting beam assembly 40 on the expansion and deformation of the battery cell assembly 20.

[0219] Please see Figure 12 and Figure 13 The battery device also includes a thermal management component 50, which is disposed on the side of the battery cell 21 where the electrode terminals are located. The thermal management component 50 includes a current collector 51, an inlet 53 connected to the current collector 51, multiple heat exchange components 52, and an outlet 54. The inlet 53 and the outlet 54 are respectively provided with an inlet 501 and an outlet 502. The heat exchange medium can flow sequentially through the inlet 501 → inlet 53 → first current collector → heat exchange component 52 → second current collector → outlet 54 to complete the heat exchange with the battery cell assembly 20, realize heat dissipation or heating, and provide suitable temperature conditions for the operation of the battery cell assembly 20.

[0220] The thermal management component 50 also includes a heat insulation component disposed between the heat exchanger 52 and the second housing 32. The heat insulation component can separate the heat exchanger 52 from the second housing 32 to prevent the heat exchange medium to be exchanged from completing heat exchange with the second housing 32 before exchanging heat with the battery cell assembly 20. The heat insulation component can further limit the heat exchange direction of the thermal management component 50 to improve the heat exchange efficiency between the battery cell assembly 20 and the thermal management component 50, thereby improving the safety of the battery device.

[0221] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: The enclosure assembly includes a first enclosure and a second enclosure arranged along a first direction, wherein the first enclosure and the second enclosure are connected to each other to form a cavity; A battery cell assembly is located within the cavity, the battery cell assembly comprising a plurality of battery cells stacked along a second direction; Multiple limiting beam assemblies are spaced apart along the second direction, and the limiting beam assembly is provided at both ends of the battery cell assembly along the second direction; The limiting beam assembly includes a limiting beam and an extension plate connected to each other. The limiting beam abuts against the battery cell. The limiting beam is connected to the first housing at least through the extension plate, and at least a portion of the extension plate is located between the battery cell and the first housing.

2. The battery device according to claim 1, characterized in that, The first housing has a first recessed platform and a cell bonding surface formed on the side facing the second housing. At least a portion of the extension plate is located within the first recessed platform, such that at least a portion of the surface of the extension plate facing away from the first housing is flush with the cell bonding surface.

3. The battery device according to claim 2, characterized in that, The first housing has a protrusion on the side facing the second housing. The protrusion protrudes towards the battery cell relative to the cell bonding surface and abuts against the battery cell. The space between the cell bonding surface and the battery cell is filled with colloid.

4. The battery device according to claim 1, characterized in that, The extension plate is located between the first housing and at least two of the battery cells.

5. The battery device according to claim 1, characterized in that, The limiting beam assembly is a metal part, and at least a portion of the extension plate is located between the limiting beam and the first box body. The extension plate is welded to the limiting beam.

6. The battery device according to claim 5, characterized in that, The first housing is a metal component, and at least one of the extension plate and the limiting beam is welded to the first housing.

7. The battery device according to claim 5, characterized in that, The first housing includes a non-metallic component, and the extension plate is bonded and fixed to the non-metallic component, or the extension plate is threadedly connected to the non-metallic component.

8. The battery device according to claim 5, characterized in that, The limiting beam includes a flanged structure extending away from the battery cell assembly, at least a portion of the extension plate is located between the flanged structure and the first housing, and the extension plate is welded to the flanged structure.

9. The battery device according to claim 1, characterized in that, The battery device further includes a thermal management component, which is disposed on the side of the battery cell assembly facing away from the first housing. The battery cell includes a housing, an electrode assembly, and electrode terminals. The electrode assembly is located inside the housing, and the electrode terminals are disposed along a first direction on the side of the housing facing the thermal management component.

10. The battery device according to claim 9, characterized in that, The thermal management component includes a current collector and a heat exchanger disposed on one side of the current collector along a second direction, the heat exchanger contacting and exchanging heat with the housings of the plurality of battery cells.

11. The battery device according to claim 10, characterized in that, The battery cell assembly is provided in multiple ways along a third direction, and the heat exchanger is provided in multiple ways accordingly. The multiple heat exchangers are spaced apart along the third direction to expose the electrode terminals of the battery cell. The first direction and the second direction are perpendicular to the third direction.

12. The battery device according to claim 10, characterized in that, The thermal management component further includes a heat insulation element, which is disposed between the second housing and at least one of the heat exchange elements.

13. The battery device according to claim 10, characterized in that, The current collector includes a first current collector and a second current collector that are connected to each other but not in communication with each other. The first current collector has an inlet flow channel inside, and the second current collector has an outlet flow channel inside.

14. The battery device according to claim 1, characterized in that, The limiting beam has a first end and a second end that are opposite to each other along a first direction. The first end faces the first box body, and the second end faces the second box body. The area of ​​the first end is larger than the area of ​​the second end.

15. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1 to 14.

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