Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment. The battery device comprises a plurality of battery cells and a soaking assembly. Wherein the plurality of battery monomers comprise a first battery monomer and a second battery monomer which are arranged along a first direction, and the distance between the first battery monomer and the middle part of the battery device is smaller than the distance between the second battery monomer and the middle part of the battery device; the soaking assembly comprises a soaking part and a phase-change working medium, the phase-change working medium is located in a soaking channel of the soaking part, the heated end of the soaking part is connected with the first battery monomer, the condensation end of the soaking part is connected with the second battery monomer, and the phase-change working medium is configured as that when the temperature of the first battery monomer is higher than that of the second battery monomer, the phase-change working medium is connected with the first battery monomer. And transferring the heat of the first battery cell to the second battery cell. Therefore, the soaking assembly can transfer heat of the battery monomers close to the middle to the battery monomers close to the end parts, so that the temperature difference between the battery monomers is reduced, the overall performance of the battery device is improved, and the service life of the battery device is prolonged.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and electrical equipment. Background Art

[0002] With the development of battery technology, battery devices are being used in more and more fields, and are gradually replacing traditional petrochemical energy in areas such as vehicle power.

[0003] A battery device includes multiple stacked battery cells. The temperature of the battery cells in the periphery of the battery device is often lower than that of the battery cells in the central area. Therefore, a temperature difference is formed between the battery cells. The different operating temperatures between the battery cells will affect the overall performance of the battery device and shorten the service life of the battery device. Utility Model Content

[0004] The main purpose of this application is to provide a battery device and electrical equipment to solve the technical problem in the related art that a temperature difference will be formed between battery cells, and the different operating temperatures between battery cells will affect their working performance and reduce the service life of the battery device.

[0005] In order to solve the above technical problems, the present application provides a battery device, which includes: multiple battery cells and a heat spreader assembly, the multiple battery cells are arranged in sequence along a first direction, the multiple battery cells include a first battery cell and a second battery cell, and along the first direction, the battery device has a first end, a middle part, and a second end arranged in sequence, the distance between the first end and the middle part is equal to the distance between the second end and the middle part, and the distance between the first battery cell and the middle part is smaller than the distance between the second battery cell and the middle part; the heat spreader assembly includes a heat spreader and a phase change medium, a heat spreader channel is provided in the heat spreader, the phase change medium is located in the heat spreader channel, the heated end of the heat spreader is connected to the first battery cell, and the condensing end of the heat spreader is connected to the second battery cell, and the phase change medium is configured to transfer the heat of the first battery cell to the second battery cell when the temperature of the first battery cell is greater than the temperature of the second battery cell. In this way, the heat equalization component can be connected to the first battery cell near the middle and the second battery cell near the end. The phase change medium is located in the heat equalization channel. The phase change medium can absorb heat from the first battery cell and transfer the heat of the first battery cell to the second battery cell to reduce the temperature difference between the battery cell near the middle and the battery cell near the end, thereby improving the overall performance of the battery device and increasing the service life of the battery device.

[0006] In some embodiments, the heat-scaling assembly further includes a wick located within at least a portion of the heat-scaling channel, and the wick is used to soak the liquid phase-change medium. This allows the liquid phase-change medium to spread throughout the heat-scaling channel due to the wick and vaporize under the action of the first battery cell near the middle. Simultaneously, the gaseous phase-change medium spontaneously spreads throughout the heat-scaling channel and liquefies under the action of the second battery cell near the end, thereby allowing the phase-change medium to circulate back and forth within the heat-scaling channel.

[0007] In some embodiments, the inner wall of the heat-scaling channel is provided with microgrooves extending in the same direction as the heat-scaling channel. This allows the liquid phase-change medium to flow through the microgrooves and, under the capillary action of the microgrooves, to the heated end of the heat-scaling element, where it absorbs heat from the first battery cell. This allows the phase-change medium to circulate back and forth within the heat-scaling channel, reducing the temperature difference between battery cells near the center and those near the edges, thereby improving the overall performance of the battery device.

[0008] In some embodiments, the heat spreader assembly is disposed between the middle portion and the first end portion, and / or the heat spreader assembly is disposed between the middle portion and the second end portion. Thus, the heat spreader assembly can extend from a position near the middle battery cell to the battery cells at the end portions, thereby simultaneously connecting to multiple battery cells. Multiple battery cells on one side of the heat spreader assembly connection portion are connected, thereby improving the heat spreader assembly's heat distribution efficiency.

[0009] In some embodiments, the vertical height of the heat spreader gradually increases from the heated end of the heat spreader to the condensing end of the heat spreader. This tilted arrangement of the heat spreader allows the liquid phase-change medium to flow back under the influence of gravity, thereby achieving reciprocating flow of the phase-change medium within the heat spreader, reducing the temperature difference between battery cells near the center and those near the edges, and improving the overall performance of the battery device.

[0010] In some embodiments, the heat spreader channel is arranged horizontally from the heated end of the heat spreader to the condensing end of the heat spreader. This facilitates assembly of the heat spreader assembly and reduces the temperature difference between battery cells near the center and those near the edges, thereby improving the overall performance of the battery device.

[0011] In some embodiments, the vertical height of the heat spreader channel gradually decreases from the heated end of the heat spreader to the condensing end. This allows the heat spreader assembly to adapt to special circumstances, reducing the temperature difference between battery cells near the center and those near the edges, thereby improving the overall performance of the battery device.

[0012] In some embodiments, the battery cells include terminals, and the terminals and the heat spreader are located on different sides of the battery cells. This prevents interference between the terminals and the heat spreader, improves the heat transfer efficiency of the heat spreader, reduces the temperature difference between the battery cells near the center and those near the edges, and improves the overall performance of the battery device.

[0013] In some embodiments, the battery device further comprises a heat exchange element, the heat exchange element being disposed on one side of the plurality of battery cells, and a heat spreader assembly being disposed on the other side of the plurality of battery cells. Thus, the heat exchange element and the heat spreader assembly being disposed on different sides of the plurality of battery cells facilitate installation of the heat spreader assembly and prevent interference between the heat exchange element and the heat spreader assembly, thereby improving the heat spreader assembly's heat distribution efficiency.

[0014] In some embodiments, the battery cells have an upper end surface, a lower end surface, and a side surface. The upper end surface and the lower end surface are arranged opposite each other, and the side surface connects the upper end surface and the lower end surface. A heat spreader assembly is arranged on the side surfaces of the plurality of battery cells, and a heat exchange element is arranged on the upper end surface and / or the lower end surface of the plurality of battery cells. In this way, the heat exchange element and the heat spreader assembly are arranged on different surfaces, so that the heat exchange element and the heat spreader assembly do not interfere with each other, thereby improving the heat spreader assembly's heat spread efficiency. Furthermore, the heat spreader assembly is arranged on the side surface, so that the heat spreader assembly can be tilted to utilize gravity to cause the liquid phase change medium to flow back.

[0015] In some embodiments, the number of heat spreader assemblies is at least two, and the at least two heat spreader assemblies are spaced apart along the first direction. This can adapt to the situation where the battery device is long and improve the temperature uniformity of the entire battery device.

[0016] In some embodiments, the number of heat spreaders is at least two, and the at least two heat spreaders are spaced apart along the second direction, wherein the second direction is perpendicular to the first direction. This can adapt to the situation where the battery device is relatively wide and improve the temperature uniformity of the entire battery device.

[0017] In some embodiments, multiple battery cells are grouped into a battery cell group, and a battery device includes at least two battery cell groups. A heat spreader assembly is positioned between two adjacent battery cell groups, and the heat spreader assembly is simultaneously connected to the battery cells in both adjacent battery cell groups. In this way, the heat spreader assembly is simultaneously connected to the battery cells in both battery cell groups, allowing the heat spreader assembly to simultaneously act on a greater number of battery cells, further simplifying the structural design of the battery device, reducing temperature differences between multiple battery cells, and improving the overall performance of the battery device.

[0018] In some embodiments, the battery device further comprises a housing having a storage space formed therein, wherein the plurality of battery cells are disposed within the storage space, and a gap is provided between the heat spreader and the inner wall of the storage space. This prevents heat exchange between the housing and the heat spreader, thereby improving the heat spread effect of the heat spreader and thereby enhancing the overall performance of the battery device.

[0019] In order to solve the above technical problems, the present application also provides an electrical device, which includes the battery device of any of the above embodiments.

[0020] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0023] Figure 2 An exploded view of a battery device provided in some embodiments of the present application;

[0024] Figure 3 is a schematic structural diagram of a battery device provided in some embodiments of the present application;

[0025] Figure 4 yes Figure 3 The first cross-sectional structural diagram of the battery device shown is along the AA direction;

[0026] Figure 5 yes Figure 3 A second cross-sectional structural diagram of the battery device shown along the AA direction;

[0027] Figure 6 yes Figure 3 The third cross-sectional structural diagram of the battery device shown is along the AA direction;

[0028] Figure 7 is a schematic structural diagram of a battery device provided in some other embodiments of the present application;

[0029] Figure 8 is a schematic structural diagram of a battery device provided in some other embodiments of the present application;

[0030] Figure 9 yes Figure 8 A schematic structural diagram of the battery device from another perspective;

[0031] Figure 10 yes Figure 9 A schematic cross-sectional view of the battery device along the BB direction is shown;

[0032] Figure 11 Schematic diagram of the structure of the battery device provided in some other embodiments of the present application.

[0033] The accompanying drawings in the specific implementation manner are as follows:

[0034] 1. Vehicle; 2. Battery device; 3. Controller; 4. Motor; 21. Battery cell; 22. Heat spreader assembly; 211. First battery cell; 212. Second battery cell; 201. Heat spreader channel; 221. Heat spreader; 222. Phase change fluid; 223. Liquid wick; 202. Microgroove; 24. Housing; 241. First portion; 242. Second portion; M, middle portion; D, upper end face; E, lower end face; F, side face. DETAILED DESCRIPTION

[0035] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0037] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0038] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0040] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0041] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0042] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0043] With technological advancements and the acceleration of the global energy transition, battery devices are increasingly being used as energy storage devices. They are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in a variety of fields such as aerospace. As battery applications continue to expand, market demand is also growing.

[0044] Typically, a battery device includes multiple stacked battery cells. The battery cells in the edge area of ​​the battery device have more heat dissipation paths than the battery cells in the middle area of ​​the battery device. The temperature of the battery cells in the edge area is often lower than that of the battery cells in the middle area. Therefore, a temperature difference is formed between the battery cells. The different operating temperatures between the battery cells will affect the overall performance of the battery device and shorten the service life of the battery device.

[0045] Based on this, the present application provides a battery device. The battery device includes: a plurality of battery cells and a heat spreader assembly. The plurality of battery cells are arranged sequentially along a first direction, and the plurality of battery cells include a first battery cell and a second battery cell. Along the first direction, the battery device has a first end portion, a middle portion, and a second end portion arranged sequentially. The distance between the first end portion and the middle portion is equal to the distance between the second end portion and the middle portion, and the distance between the first battery cell and the middle portion is less than the distance between the second battery cell and the middle portion. That is, the first battery cell is closer to the middle portion of the battery device, and the second battery cell is closer to the end portion of the battery device. The heat spreader assembly includes a heat spreader and a phase change medium. The heat spreader has a heat spreader channel disposed within the heat spreader. The phase change medium is located within the heat spreader channel. The heated end of the heat spreader is connected to the first battery cell, and the condensing end of the heat spreader is connected to the second battery cell. The phase change medium is configured to transfer heat from the first battery cell to the second battery cell. In this way, the heat spreader assembly can transfer heat from the first battery cell near the middle portion to the second battery cell near the end portion, thereby reducing the temperature difference between the first battery cell and the second battery cell, improving the overall performance of the battery device, and increasing the service life of the battery device.

[0046] The solution of this application will be described in detail below with reference to the accompanying drawings and embodiments.

[0047] The present application provides an electrical device, which includes a battery device. The battery device can be used to provide electrical energy to electrical components in the electrical device.

[0048] Electrically powered equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be fuel-powered, gas-powered, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles, or extended-range vehicles. Spacecraft include aircraft, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. 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.

[0049] For the convenience of explanation, the following embodiments are described by taking a vehicle as an example of an electrical device in one embodiment of the present application. Figure 1 As shown, Figure 1 It is a schematic structural diagram of a vehicle provided in some embodiments of the present application.

[0050] Vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. Vehicle 1 includes a battery device 2. Battery device 2 can be used to power vehicle 1. Battery device 2 is provided inside vehicle 1. Battery device 2 can be provided at the bottom, head or tail of vehicle 1. Battery device 2 can be used to power electrical devices of vehicle 1. For example, battery device 2 can serve as an operating power source for vehicle 1. Vehicle 1 can also include a controller 3 and a motor 4. Controller 3 is used to control battery device 2 to power motor 4, for example, to meet the power requirements of vehicle 1 during startup, navigation and driving.

[0051] In some embodiments of the present application, the battery device 2 can serve not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0052] Please refer to Figure 2 As shown, Figure 2 Exploded diagram of a battery device provided for some embodiments of the present application. The battery device 2 includes a housing 24 and a battery cell 21, and the battery cell 21 is accommodated in the housing 24. The housing 24 is used to provide a storage space for the battery cell 21, and the housing 24 can adopt a variety of structures. In some embodiments, the housing 24 can include a first portion 241 and a second portion 242, and the first portion 241 and the second portion 242 cover each other, and the first portion 241 and the second portion 242 jointly define a storage space for accommodating the battery cell 21. The second portion 242 can be a hollow structure with one end open, and the first portion 241 can be a plate-like structure, and the first portion 241 covers the open side of the second portion 242, so that the first portion 241 and the second portion 242 jointly define a storage space; the first portion 241 and the second portion 242 can also be hollow structures with one side open, and the open side of the first portion 241 covers the open side of the second portion 242. Of course, the box body 24 formed by the first part 241 and the second part 242 can be in various shapes, such as a cylinder, a cuboid, etc.

[0053] The battery device 2 may include multiple battery cells 21, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the battery cell 21. Multiple battery cells 21 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery unit 21 may be housed within the housing 24. Alternatively, the battery device 2 may comprise multiple battery cells 21 connected in series, in parallel, or in a hybrid configuration to form a battery module. The battery modules are then connected in series, in parallel, or in a hybrid configuration to form a single unit housed within the housing 24. The battery device 2 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 21.

[0054] Among them, each battery cell 21 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but it is not limited to this. The battery cell 21 can be cylindrical, flat, rectangular or other shapes. Primary batteries are also called "disposable" batteries and primary batteries because they can no longer be recharged and can only be discarded after their power is exhausted. The manufacturing materials and processes of secondary batteries are different from those of primary batteries. Their advantage is that they can be recycled many times after charging, and the output current load capacity of secondary batteries is higher than that of most primary batteries. Currently common types of secondary batteries are: lead-acid batteries, nickel-metal hydride batteries and lithium-ion batteries.

[0055] The battery cell 21 includes an end cap, a housing, an electrode assembly, and other functional components.

[0056] An end cap is a component that fits over the opening of the housing to isolate the internal environment of the battery cell 21 from the external environment. The shape of the end cap can be adapted to the shape of the housing to fit the housing. Optionally, the end cap can be made of a material with a certain degree of hardness and strength (such as an aluminum alloy). This prevents deformation during compression and collision, providing the battery cell 21 with greater structural strength and improved safety. The end cap can be provided with functional components such as electrode terminals. Electrode terminals can be used to electrically connect to the electrode assembly for inputting or outputting electrical energy from the battery cell 21. In some embodiments, the electrode terminals can include posts. Posts can include positive and negative posts, used for current output and connection to external circuits. In some embodiments, the end cap can also be provided with a pressure relief mechanism to release internal pressure when the internal pressure or temperature of the battery cell 21 reaches a threshold. The end cap can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic, and this is not specifically limited in the present embodiments. In some embodiments, an insulating member may be provided inside the end cap to isolate the electrical connection components in the housing from the end cap to reduce the risk of short circuit.

[0057] The shell is a component used to cooperate with the end cover to form the internal environment of the battery cell 21, wherein the formed internal environment can be used to accommodate the electrode assembly, electrolyte and other components. The shell and the end cover can be independent components, and an opening can be set on the shell, and the internal environment of the battery cell 21 is formed by covering the opening with the end cover at the opening. Without limitation, the end cover and the shell can also be integrated. Specifically, the end cover and the shell can form a common connection surface before other components are put into the shell, and when the interior of the shell needs to be encapsulated, the end cover is covered with the shell. The shell can be of various shapes and sizes, such as rectangular, cylindrical, hexagonal, etc. Specifically, the shape of the shell can be determined according to the specific shape and size of the electrode assembly. The material of the shell can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.

[0058] The electrode assembly is the component in the battery cell 21 where the electrochemical reaction occurs. One or more electrode assemblies may be contained in the housing. The electrode assembly is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the tab. The positive electrode tab and the negative electrode tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0059] In order to improve the overall performance of the electrical equipment, this application also provides a battery device, see Figure 3 and Figure 4 As shown, Figure 3 is a schematic structural diagram of a battery device provided in some embodiments of the present application, Figure 4 yes Figure 3 The battery device is shown as a first cross-sectional structural schematic diagram along the AA direction.

[0060] In some embodiments, the battery device 2 may include a plurality of battery cells 21 and a heat spreader assembly 22. The plurality of battery cells 21 are arranged along a first direction X, and the plurality of battery cells 21 include a first battery cell 211 and a second battery cell 212. Along the first direction X, the battery device 2 has a first end portion, a middle portion M, and a second end portion arranged in sequence. The distance between the first end portion and the middle portion is equal to the distance between the second end portion and the middle portion, and the distance between the first battery cell 211 and the middle portion is less than the distance between the second battery cell 212 and the middle portion. The heat spreading component 22 includes a heat spreading member 221 and a phase change medium 222. A heat spreading channel 201 is provided in the heat spreading member 221. The phase change medium 222 is located in the heat spreading channel 201. The heated end of the heat spreading member 221 is connected to the first battery cell 211, and the condensing end of the heat spreading member 221 is connected to the second battery cell 212. The phase change medium 222 is configured to transfer the heat of the first battery cell 211 to the second battery cell 212 when the temperature of the first battery cell 211 is greater than the temperature of the second battery cell 212.

[0061] The battery device 2 is defined along a first direction by a first end portion, a middle portion M, and a second end portion, with the first end portion and the second end portion being located at opposite ends of the middle portion M. The first end portion and the second end portion may be two end walls of the battery device 2 along the first direction. Among the multiple battery cells 21, the distance between the first battery cell 211 and the middle portion M is smaller than the distance between the second battery cell 212 and the middle portion M. That is, the first battery cell 211 is positioned closer to the middle portion M of the battery device 2 than the second battery cell 212. Because the first battery cell 211 closer to the middle portion M has more heat dissipation paths than the second battery cell 212 at the end portions, the temperature of the first battery cell 211 is higher than that of the second battery cell 212, thereby forming a temperature difference between the battery cells 21.

[0062] See also Figure 4 As shown, a heat-scaling channel 201 is provided within the heat-scaling member 221, and a phase-change medium 222 is located within the heat-scaling channel 201. Phase-change medium 222 refers to a type of material that can undergo a physical change at a specific temperature and absorb or release a large amount of latent heat in the process. Phase-change medium 222 can be a gas-liquid phase-change medium. Gaseous phase-change medium 222 can liquefy at low temperatures, while liquid phase-change medium 222 can vaporize at high temperatures. Phase-change medium 222 can include, but is not limited to, Freon, ethanol solution, acetone solution, and the like.

[0063] The heat-averaging channel 201 can be sealed, with one end of the heat-averaging channel 201 extending to the heated end of the heat-averaging component 221, and the other end of the heat-averaging channel 201 extending to the condensing end of the heat-averaging component 221. The heated end of the heat-averaging component 221 refers to the portion of the heat-averaging component 221 that is in direct contact with the heat source (the first battery cell 211), which is responsible for absorbing heat. The phase-change medium 222 in the heat-averaging channel 201 evaporates into a gas phase after absorbing heat at the heated end, and takes away a large amount of heat from the first battery cell 211 through phase change. The condensing end of the heat-averaging component 221 refers to the portion of the heat-averaging component 221 that is away from the heat release. The gaseous phase-change medium 222 condenses back into a liquid after being cooled at the condensing end, releasing latent heat. The direction of heat transfer in the heat-averaging component 22 is from the heated end to the condensing end.

[0064] The heated end of the heat equalizing member 221 is connected to the first battery cell 211, and the condensing end of the heat equalizing member 221 is connected to the second battery cell 212. The phase change medium 222 absorbs heat from the first battery cell 211 and vaporizes. The vaporized phase change medium 222 moves through the heat equalizing channel 201 to the second battery cell 212 with a lower temperature. Under the influence of the second battery cell 212, the vaporized phase change medium 222 liquefies to release the heat absorbed from the first battery cell 211.

[0065] In the above-described method, the phase-change medium 222 can transform between a gaseous state and a liquid state under the influence of the temperature of the first battery cell 211 and the second battery cell 212, thereby transferring heat from the first battery cell 211 to the second battery cell 212, thereby achieving heat transfer between the battery cells 21 near the center and the battery cells 21 near the ends. This reduces the heat difference between the battery cells 21 near the center and the battery cells 21 near the ends, thereby making the temperature between the battery cells 21 more uniform, improving the overall performance of the battery device 2 and increasing the service life of the battery device 2.

[0066] like Figure 5 As shown, Figure 5 yes Figure 3 The second cross-sectional structural diagram of the battery device along the AA direction is shown.

[0067] In some embodiments, the heat-saturating assembly 22 may further include a liquid wick 223 . The liquid wick 223 is located in at least a portion of the heat-saturating channel 201 . The liquid wick 223 is used to soak the liquid phase-change medium 222 .

[0068] For example, the wick 223 may fill the entire heat-averaging channel 201, or the wick 223 may fill a portion of the heat-averaging channel 201, while the remaining portion of the wick 223 is left empty. The wick 223 may absorb the liquid phase-change medium 222, which may permeate the wick 223. The wick 223 may be fixed within the heat-averaging channel 201 by welding, gluing, interference fit, or the like.

[0069] When the temperature of the first battery cell 211 is high, the liquid phase change medium 222 in the heat equalizing member 221 can be affected by the temperature of the first battery cell 211 and vaporized. The vaporized phase change medium 222 moves to the position of the second battery cell 212 with a lower temperature in the heat equalizing channel 201. The gaseous phase change medium 222 in the heat equalizing member 221 can be affected by the temperature of the second battery cell 212 with a lower temperature and liquefied. The liquefied phase change medium 222 can infiltrate the liquid wick 223 and diffuse to the first battery cell 211 with a higher temperature under the action of the liquid wick 223, so that the gaseous phase change medium 222 and the liquid phase change medium 222 circulate in the heat equalizing channel 201, thereby realizing heat conduction between the battery cells 21 in the middle area and the battery cells 21 in the end areas, reducing the temperature difference between the battery cells 21 in the middle area and the end areas, improving the overall performance of the battery device 2, and increasing the service life of the battery device 2.

[0070] See also Figure 6 As shown, Figure 6 yes Figure 3 The third cross-sectional structural diagram of the battery device along the AA direction is shown.

[0071] In some embodiments, micro grooves 202 may be provided on the inner wall of the heat-distributing channel 201 , and the extending direction of the micro grooves 202 is the same as the extending direction of the heat-distributing channel 201 .

[0072] By providing the microgrooves 202, the liquid phase-change medium 222 can diffuse through the microgrooves 202 to the first battery cell 211 with a higher temperature. The gaseous phase-change medium 222 in the heat-equalizing member 221 can be liquefied by the temperature of the second battery cell 212 with a lower temperature. The liquefied phase-change medium 222 can diffuse to the first battery cell 211 with a higher temperature under the action of the microgrooves 202. The gaseous phase-change medium 222 and the liquid phase-change medium 222 circulate within the heat-equalizing channel 201, thereby achieving heat conduction between the battery cells 21 in the middle region and the battery cells 21 at the end regions, and reducing the temperature difference between the battery cells 21 in the middle region and the end regions. This improves the overall performance of the battery device 2 and increases the service life of the battery device 2.

[0073] like Figure 7 As shown, Figure 7Schematic diagram of the structure of the battery device provided in some other embodiments of the present application.

[0074] In some embodiments, the heat spreader 22 is disposed between the middle portion M and the first end portion and between the middle portion M and the second end portion. That is, a heat spreader 22 is correspondingly disposed between the middle portion M and the first end portion and between the middle portion M and the second end portion. In this way, the battery cells 21 on both sides of the middle portion M can be heat spread by different heat spreaders 22. Moreover, the heat spreader 22 can be simultaneously connected to multiple battery cells 21 arranged along the first direction X, further improving the heat spread efficiency of the battery cells 21 and reducing the temperature difference between the multiple battery cells 21, thereby improving the overall performance of the battery device 2 and increasing the service life of the battery device 2.

[0075] In other embodiments, the heat spreader 22 may be provided only between the middle portion M and the first end portion, or between the middle portion M and the second end portion, so as to only spread heat on one side of the battery cells 21. Specifically, the configuration may be made based on the actual usage scenario.

[0076] In some embodiments, the height of the heat-scaling channel 201 in the vertical direction gradually increases from the heated end of the heat-scaling element 221 to the condensing end of the heat-scaling element 221 .

[0077] The extension direction of the heat-scaling channel 201 can be consistent with the extension direction of the entire heat-scaling element 221. This method simplifies the manufacturing process of the heat-scaling assembly 22. The heat-scaling assembly 22 can be tilted so that the height of the heat-scaling channel 201 in the vertical direction gradually increases from the heated end of the heat-scaling element 221 to the condensing end of the heat-scaling element 221. It is understood that in other embodiments, in the heat-scaling assembly 22, the extension direction of the heat-scaling channel 201 can also be inconsistent with the extension direction of the heat-scaling element 221. It is only necessary to configure the heat-scaling channel 201 in the above-mentioned tilted manner.

[0078] In this configuration, the heat-scaling channel 201 is tilted upward, with the angle between the heat-scaling channel 201 and the horizontal plane being greater than 0 degrees. Thus, the liquid phase-change medium 222 within the heat-scaling element 221 can be affected by the temperature of the first battery cell 211 in the middle portion M and vaporize. The vaporized phase-change medium 222 then moves within the heat-scaling channel 201 to the region of the second battery cell 212, where the temperature is lower. The gaseous phase-change medium 222 within the heat-scaling element 221 can be affected by the temperature of the second battery cell 212, where the temperature is lower, and liquefy. The liquefied phase-change medium 222 can then flow back to the first battery cell 211, where the temperature is higher, under the action of gravity. This configuration allows the gaseous and liquid phase-change medium 222 to circulate rapidly within the heat-scaling channel 201, thereby achieving heat transfer between the battery cells 21 in the middle portion and the battery cells 21 at the ends. The action of gravity can improve the heat transfer efficiency of the phase-change medium 222.

[0079] In other embodiments, the heat-spreading channel 201 is horizontally arranged in a direction from the heated end of the heat-spreading element 221 to the condensing end of the heat-spreading element 221 .

[0080] The extension direction of the heat-saturating channel 201 can be consistent with the extension direction of the entire heat-saturating element 221. This method simplifies the manufacturing process of the heat-saturating assembly 22. The heat-saturating element 221 can be arranged horizontally, so that the heat-saturating channel 201 is arranged horizontally. It is understood that in other embodiments, in the heat-saturating assembly 22, the extension direction of the heat-saturating channel 201 and the extension direction of the heat-saturating element 221 can also be inconsistent, and the heat-saturating channel 201 only needs to be configured to be arranged horizontally.

[0081] In this manner, a liquid wick 223 is provided in the heat-averaging channel 201 and / or microgrooves 202 are provided on the inner wall of the heat-averaging channel 201. For an introduction to the liquid wick 223 and the microgrooves 202, please refer to the introduction to the above-mentioned embodiment, which will not be repeated here. The liquid phase-change medium 222 can diffuse to the first battery cell 211 where the temperature is higher through the liquid wick 223 and / or the microgrooves 202, so that the gaseous phase-change medium 222 and the liquid phase-change medium 222 circulate in the heat-averaging channel 201, thereby realizing heat conduction between the battery cells 21 in the middle area and the battery cells 21 at the end areas.

[0082] In some other embodiments, the height of the heat-scaling channel 201 in the vertical direction gradually decreases from the heated end of the heat-scaling element 221 to the condensing end of the heat-scaling element 221 .

[0083] The extension direction of the heat spreader 201 can be consistent with the extension direction of the entire heat spreader 221. This method simplifies the manufacturing process of the heat spreader assembly 22. The heat spreader 221 can be tilted so that the vertical height of the heat spreader 201 gradually decreases from the heated end of the heat spreader 221 to the condensing end of the heat spreader 221. In other embodiments, in the heat spreader assembly 22, the extension direction of the heat spreader 201 can also be inconsistent with the extension direction of the heat spreader 221. The heat spreader 201 can simply be configured in the above-mentioned tilted manner.

[0084] In this manner, a liquid wick is provided within the heat-averaging channel 201 and / or microgrooves 202 are provided on the inner wall of the heat-averaging channel 201. For an introduction to the liquid wick 223 and the microgrooves 202, please refer to the introduction to the above embodiment. The liquid phase-change medium 222 can diffuse through the liquid wick 223 and / or the microgrooves 202 to the first battery cell 211 where the temperature is higher, so that the gaseous phase-change medium 222 and the liquid phase-change medium 222 circulate within the heat-averaging channel 201, thereby achieving heat conduction between the battery cells 21 in the middle region and the battery cells 21 at the ends.

[0085] In some embodiments, as Figure 8 、 Figure 9 、 Figure 10 As shown, Figure 8 is a schematic structural diagram of a battery device provided in some embodiments of the present application, Figure 9 yes Figure 8 A schematic structural diagram of the battery device from another perspective is shown. Figure 10 yes Figure 9 The battery device 2 may further include a housing 24 having a receiving space formed therein, wherein a plurality of battery cells 21 are located within the receiving space. A gap d is defined between the heat spreader 221 and the inner wall of the receiving space.

[0086] The housing 24 is used to protect the battery cells 21. This arrangement prevents contact between the housing 24 and the heat spreader 221. Therefore, no heat exchange occurs between the housing 24 and the heat spreader 221. The housing 24 does not affect the heat conduction of the heat spreader 22, thereby improving the heat conduction effect of the heat spreader 22, reducing the temperature difference between the battery cells 21 near the middle portion M and the battery cells 21 near the ends, and improving the overall performance of the battery device 2.

[0087] The poles of the battery cell 21 and the heat spreader 22 may be located on different sides of the battery cell 21 .

[0088] The battery cell 21 includes end walls disposed opposite to each other and side walls connected to the two end walls. For example, the terminal of the battery cell 21 is located on one end wall of the battery cell 21, and the heat spreader 221 is located on the other end wall of the battery cell 21. Alternatively, the terminal of the battery cell 21 is located on one end wall of the battery cell 21, and the heat spreader 22 is located on the side wall of the battery cell 21, etc.

[0089] In this way, the heat spreader assembly 22 does not interfere with the poles of the battery cells 21 , which facilitates the installation of the heat spreader assembly 22 and increases the contact area between the heat spreader assembly 22 and the battery cells 21 , thereby improving the heat spreader efficiency.

[0090] In some embodiments, the battery device 2 may further include a heat exchange component (not shown). The heat exchange component and the heat distribution assembly 22 may be disposed on different sides of the plurality of battery cells 21 .

[0091] That is, the heat exchange component is provided on one side of the multiple battery cells 21, and the heat equalizing component 22 is provided on the other side of the multiple battery cells 21. The heat exchange component can be used to connect to multiple battery cells 21 at the same time to perform heat exchange with multiple battery cells 21 at the same time. The heat exchange component can be provided with a heat exchange channel, and the heat exchange channel is used for fluid flow. The fluid may include but is not limited to air flow, cooling water, cooling oil or deionized water. The heat exchange component can cool or heat multiple battery cells at the same time. When it is necessary to cool the battery cell 21, a fluid with a lower temperature than the battery cell 21 can be injected into the heat exchange channel of the heat exchange component; when it is necessary to heat the battery cell 21, a fluid with a higher temperature than the battery cell 21 can be injected into the heat exchange channel of the heat exchange component. The heat exchange component can control the overall temperature of the battery device 2 so that the temperature of the battery device 2 can be maintained within a reasonable range, thereby improving the working performance of the battery device 2 and increasing the service life of the battery device 2.

[0092] For example, the heat spreader assembly 22 is disposed on one end wall of the battery cells 21, and the heat exchange element is disposed on the other end wall of the battery cells 21. Alternatively, the heat spreader assembly 22 is disposed on one end wall of the battery cells 21, and the heat exchange element is disposed on the side wall of the battery cells 21. This arrangement prevents interference between the heat spreader assembly 22 and the heat exchange element, simplifying the installation process of the heat exchange element and the heat spreader assembly 22. Furthermore, heat is not exchanged between the heat spreader assembly 22 and the heat exchange element, and the heat exchange element does not affect the heat conduction of the heat spreader assembly 22, thereby improving the temperature equalization efficiency of the heat spreader assembly 22.

[0093] Further, see Figure 7As shown, the battery cell 21 has an upper end face D, a lower end face E and a side face F. The upper end face D and the lower end face E are arranged opposite to each other, and the side face F connects the upper end face D and the lower end face E. The upper end face D, the lower end face E and the side face F described here are defined according to the direction in which the battery cell 21 is placed in the box body 24. Specifically, after the battery cell 21 is placed in the box body 24, the end face at the upper end is the upper end face D, the end face at the lower end is the lower end face E, and the end face at the side end is the side face F. The heat exchange component can be connected to the upper end face D and / or the lower end face E of multiple battery cells 21. The heat spreader assembly 22 can be connected to the side faces F of multiple battery cells 21.

[0094] With this arrangement, the heat exchange element does not interfere with the heat equalizing assembly 22, and the heat exchange element does not affect the heat transfer of the heat equalizing assembly 22, thereby improving the heat equalizing effect of the heat equalizing assembly 22. Moreover, the upper end surface D and the lower end surface E can be the large surface side of the battery cell 21, and the heat exchange element is connected to the large surface side of the battery cell 21, which can improve the heat exchange effect of the battery device 2. The heat equalizing assembly 22 is arranged on the side F of multiple battery cells 21. In this way, the phase change medium 222 in the heat equalizing channel 201 can flow back due to the action of gravity, so that the gaseous phase change medium 222 and the liquid phase change medium 222 can circulate quickly in the heat equalizing channel 201, thereby improving the heat exchange efficiency of the heat equalizing assembly 22. Moreover, the heat equalizing assembly 22 can contact multiple battery cells 21 at the same time to simultaneously equalize the heat of multiple battery cells 21, thereby improving the heat equalization effect.

[0095] In some embodiments, in the battery device 2 , the number of the heat spreader assemblies 22 is at least two, and the at least two heat spreader assemblies 22 are spaced apart along the first direction X.

[0096] When the battery device 2 is long (along the first direction X), at least two heat spreaders 22 may be arranged along the length of the battery device 2 (along the first direction X). For example, two, three, or four heat spreaders 22 may be provided between the middle portion M and the first end portion.

[0097] This arrangement can increase the inclination angle of the heat spreader assembly 22 and improve the heat spread efficiency of the heat spreader assembly 22. In addition, more battery cells 21 can contact the heat spreader assembly 22, improving the overall heat spread effect of the battery device 2.

[0098] In some embodiments, the number of the heat spreader assemblies 22 is at least two, and the at least two heat spreader assemblies 22 are spaced apart along the second direction Y, wherein the second direction Y is perpendicular to the first direction X.

[0099] When the width (length along the second direction Y) of the battery device 2 is large, at least two heat spreaders 22 may be provided along the width direction of the battery device 2 . For example, two, three, or four heat spreaders 22 may be provided along the width direction of the battery device 2 .

[0100] In the above manner, the middle battery cell 21 and the end battery cell 21 can be temperature-equalized simultaneously by at least two heat-equalizing components 22, thereby increasing the contact area between the heat-equalizing components 22 and the battery cell 21 and improving the heat-equalizing effect, thereby improving the performance of the entire battery device 2.

[0101] In some embodiments, as Figure 11 As shown, Figure 11 This is a schematic diagram of the structure of a battery device provided in other embodiments of the present application. Multiple battery cells 21 are grouped into a battery cell group. The battery device 2 includes at least two battery cell groups. A heat spreader assembly 22 can be disposed between two adjacent battery cell groups. The heat spreader assembly 22 can be connected to the battery cells 21 in two adjacent battery cell groups simultaneously.

[0102] In this way, the heat spreader 22 can act on a greater number of battery cells 21 simultaneously, further simplifying the structural design of the battery device 2 , reducing the temperature difference between the multiple battery cells 21 , and improving the overall performance of the battery device 2 .

[0103] According to some embodiments of this application, please refer to Figure 5-Figure 7 As shown, the battery device 2 includes a plurality of battery cells 21 stacked in sequence along a first direction X, with a heat spreader assembly 22 provided on the side surfaces C of the plurality of battery cells 21. The heat spreader assembly 22 extends from a first battery cell 211 near the middle portion M to a second battery cell 212 at the end, enabling the heat spreader assembly 22 to transfer heat from the battery cells 21 near the middle portion M to the battery cells 21 at the end. The heat spreader assembly 22 is connected to the side surfaces C of the plurality of battery cells 21, thereby spreading heat across the plurality of battery cells 21 and achieving a more uniform temperature among the battery cells 21.

[0104] The heat spreader 22 is bonded to the side surfaces C of the plurality of battery cells 21 , and the bonding solution may be double-sided adhesive bonding or other thermally conductive adhesive bonding.

[0105] A heat spreader 22 is provided between the middle portion M and the first end portion, and between the middle portion M and the second end portion, of the battery device 2. This arrangement enables the heat spreader 22 to perform heat spread treatment on the battery cells 21 on both sides of the middle portion M, thereby reducing the temperature difference between the battery cells 21, improving the heat spread effect, and enhancing the overall performance of the battery device 2.

[0106] Furthermore, the heat spreader assembly 22 is tilted so that the vertical height of the heat spreader channel 201 gradually increases from the middle portion M to the end portion. The angle between the heat spreader channel 201 and the horizontal plane can be 3°-20°, so that the tilt angle of the heat spreader 221 can take into account the width of the side surface C of the battery cell 21, and the heat spreader assembly 22 will not extend beyond the side surface C of the battery cell 21 after installation.

[0107] The heat-averaging channel 201 is placed at a certain tilt angle, which allows the liquid phase-change medium 222 to flow back under the action of gravity, so that the phase-change medium 222 circulates back and forth in the heat-averaging channel 201, reducing the temperature difference between the battery cells 21 near the middle M and the battery cells 21 near the end, making the temperature of the battery device 2 more uniform, and improving the overall performance of the battery device 2.

[0108] In order to increase the heat transfer rate, micro grooves 202 can be set on the inner wall of the heat-averaging channel 201 and / or a liquid wick 223 can be filled in the heat-averaging channel 201. The micro grooves 202 and the liquid wick 223 are used to provide capillary force, thereby promoting the reflux of the liquid phase change medium 222.

[0109] In summary, in the above embodiment, a heat spreader assembly 22 is provided in the battery device 2, and the heat spreader assembly 22 connects the first battery cell 211 near the middle portion M and the second battery cell 212 near the end. The phase change medium 222 in the heat spreader assembly 22 can be converted between gas and liquid under the influence of the temperature of the first battery cell 211 near the middle portion M and the second battery cell 212 near the end, so as to transfer the heat of the first battery cell 211 to the second battery cell 212. This reduces the temperature difference between the battery cell 21 near the middle portion M and the battery cell 21 near the end, improves the temperature uniformity between the battery cells 21, thereby improving the overall performance of the battery device 2 and increasing the service life of the battery device 2.

[0110] The above-described embodiments do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the above-described embodiments are included in the scope of protection of this technical solution.

Claims

1. A battery device, characterized in that: The battery device comprises: a plurality of battery cells, the plurality of battery cells being sequentially arranged along a first direction, the plurality of battery cells including a first battery cell and a second battery cell, the battery device having a first end portion, a middle portion, and a second end portion sequentially arranged along the first direction, the distance between the first end portion and the middle portion being equal to the distance between the second end portion and the middle portion, and the distance between the first battery cell and the middle portion being smaller than the distance between the second battery cell and the middle portion; A heat spreader assembly includes a heat spreader and a phase change medium. A heat spreader channel is provided in the heat spreader, and the phase change medium is located in the heat spreader channel. The heated end of the heat spreader is connected to the first battery cell, and the condensing end of the heat spreader is connected to the second battery cell. The phase change medium is configured to transfer the heat of the first battery cell to the second battery cell when the temperature of the first battery cell is greater than the temperature of the second battery cell.

2. The battery device according to claim 1, wherein: The heat-saturating component further includes a liquid wick, which is located in at least a portion of the heat-saturating channel and is used to soak the liquid phase-change working medium.

3. The battery device according to claim 1, wherein: The inner wall of the heat-averaging channel is provided with micro grooves, and the extension direction of the micro grooves is the same as the extension direction of the heat-averaging channel.

4. The battery device according to claim 1, wherein: The heat spreader is disposed between the middle portion and the first end portion, and / or the heat spreader is disposed between the middle portion and the second end portion.

5. The battery device according to any one of claims 1 to 4, characterized in that: From the heated end of the heat spreader to the condensing end of the heat spreader, the height of the heat spreader channel in the vertical direction gradually increases.

6. The battery device according to claim 2 or 3, characterized in that: The heat-scaling channel is arranged horizontally from the heated end of the heat-scaling element to the condensing end of the heat-scaling element.

7. The battery device according to claim 2 or 3, characterized in that: From the heated end of the heat spreader to the condensing end of the heat spreader, the height of the heat spreader channel in the vertical direction gradually decreases.

8. The battery device according to claim 1, wherein: The battery cell includes a pole, and the pole and the heat spreader are located on different sides of the battery cell.

9. The battery device according to claim 1, wherein: The battery device further includes a heat exchange component, wherein the heat exchange component is disposed on one side of the plurality of battery cells, and the heat distribution component is disposed on the other side of the plurality of battery cells.

10. The battery device according to claim 9, characterized in that The battery cell has an upper end surface, a lower end surface, and a side surface. The upper end surface and the lower end surface are arranged opposite to each other, and the side surface connects the upper end surface and the lower end surface. The heat spreader assembly is disposed on the side surfaces of the plurality of battery cells, and the heat exchange element is disposed on the upper end surfaces and / or lower end surfaces of the plurality of battery cells.

11. The battery device according to claim 1, wherein: The number of the heat spreader components is at least 2, and at least 2 of the heat spreader components are spaced apart along the first direction.

12. The battery device according to claim 1, wherein: The number of the heat spreader components is at least 2, and at least 2 of the heat spreader components are spaced apart along a second direction, wherein the second direction is perpendicular to the first direction.

13. The battery device according to claim 1, wherein: The plurality of battery cells are divided into one battery cell group, the battery device includes at least two battery cell groups, the heat spreader assembly is disposed between two adjacent battery cell groups, and the heat spreader assembly is simultaneously connected to the battery cells of the two adjacent battery cell groups.

14. The battery device according to claim 1, wherein: The battery device further includes a box body, wherein the box body is formed with a receiving space, and the plurality of battery cells are arranged in the receiving space, and a gap is provided between the heat spreader and an inner wall of the box body.

15. An electrical device, characterized in that: The electrical equipment comprises the battery device according to any one of claims 1 to 14.

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