A battery device and an electric device

Abstract

The application discloses a battery device and a power utilization device. The battery device comprises a plurality of battery monomers and a uniform temperature assembly. The uniform temperature assembly comprises a uniform temperature piece, a liquid absorbing core and a phase change working medium. The uniform temperature piece is in contact with at least two battery monomers. The uniform temperature piece is formed with a phase change channel. The liquid absorbing core is accommodated in at least part of the phase change channel. The phase change working medium is located in the phase change channel. The phase change working medium can be converted between a liquid state and a gaseous state under the influence of the temperature of the battery monomers. The liquid absorbing core is used for soaking the liquid phase change working medium. Thus, the uniform temperature piece is in contact with at least two battery monomers, heat transfer between the uniform temperature piece and the battery monomers is facilitated, the uniform temperature treatment of the plurality of battery monomers is realized through the state change of the phase change working medium, the temperature difference between the plurality of battery monomers is reduced, and the overall performance of the battery device is improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to sustainable development, which in turn promotes the adjustment of the energy structure and drives the development and application of battery technology. The key to the development of battery technology lies in electrochemical energy storage technology. Due to its advantages such as high energy density, good cycle capability, high operating voltage, environmental friendliness, and low self-discharge, it has been widely used in portable electronics, electric vehicles, and energy storage systems.

[0003] A battery device consists of multiple battery cells. During the charging and discharging process, the temperature difference between the multiple battery cells may be large due to factors such as their different positions, resulting in poor overall temperature uniformity of the battery device and thus poor overall performance of the battery device. Summary of the Invention

[0004] The main objective of this application is to provide a battery device and an electrical device that address the technical problem of poor overall temperature uniformity in existing battery devices.

[0005] To address the aforementioned problems, this application provides a battery device comprising multiple battery cells and a temperature equalization assembly. The temperature equalization assembly includes a temperature equalization element, a liquid absorbent core, and a phase change working fluid. The temperature equalization element is in contact with at least two of the battery cells and forms a phase change channel. The liquid absorbent core is accommodated in at least a portion of the phase change channel, and the phase change working fluid is located within the phase change channel. The phase change working fluid can switch between a liquid and a gaseous state under the influence of the temperature of the battery cells. The liquid absorbent core is used to wet the liquid phase change working fluid. Thus, the temperature equalization element comes into contact with at least two battery cells, facilitating heat transfer between the element and the cells. The element also forms a phase change channel, with a liquid absorber wick housed within at least a portion of this channel. The absorber wick is used to immerse the liquid phase change working fluid, allowing it to spread throughout the channel and vaporize under the influence of the higher-temperature battery cells. Simultaneously, the gaseous phase change working fluid spontaneously spreads throughout the channel and liquefies under the influence of the lower-temperature battery cells. Ultimately, the temperature equalization of multiple battery cells is achieved through the state change of the phase change working fluid, reducing the temperature difference between the cells and improving the overall performance of the battery device.

[0006] In some embodiments, the portion of the phase change channel not filled by the wick serves as redundant space. Both the wick and the redundant space extend along a first direction, and at least two battery cells are arranged in this first direction and simultaneously contact the temperature equalization element. Therefore, with both the wick and the redundant space extending along the first direction, and at least two battery cells arranged in this direction and simultaneously contacting the temperature equalization element, it is easier for the liquid and gaseous phase change working fluids to act on the battery cells arranged along the first direction, further improving the temperature equalization efficiency of the battery cells and reducing the temperature difference between multiple battery cells, thereby improving the overall performance of the battery device.

[0007] In some embodiments, the temperature equalization element has microgrooves on the bottom wall of the phase change channel, the liquid wick covers the microgrooves, and the microgrooves extend along the first direction. Thus, the liquid phase change working fluid flows through the microgrooves along the first direction, making it easier for the liquid phase change working fluid to act on the battery cells arranged along the first direction, further improving the temperature equalization efficiency of the battery cells, reducing the temperature difference between multiple battery cells, and improving the overall performance of the battery device.

[0008] In some embodiments, the redundant space is located on both sides of the liquid-absorbing core in a second direction perpendicular to the first direction. Therefore, having the redundant space on both sides of the liquid-absorbing core in the second direction facilitates the interaction of liquid and gaseous phase change media with the battery cells arranged along the first direction, further improving the temperature equalization efficiency of the battery cells and reducing the temperature difference between multiple battery cells, thereby improving the overall performance of the battery device.

[0009] In some embodiments, the temperature equalization assembly further includes a bundle strip sandwiched between the absorbent core and the top wall of the temperature equalization element. Thus, the bundle strip sandwiched between the absorbent core and the top wall of the temperature equalization element can limit excessive deformation of the absorbent core to block at least part of the redundant space.

[0010] In some embodiments, the absorbent core is located on both sides of the redundant space at least in a second direction perpendicular to the first direction. Therefore, having the absorbent core located on both sides of the redundant space in the second direction perpendicular to the first direction facilitates the application of liquid and gaseous phase change media to the battery cells arranged along the first direction, further improving the temperature equalization efficiency of the battery cells and reducing the temperature difference between multiple battery cells, thereby improving the overall performance of the battery device.

[0011] In some embodiments, the liquid suction core is fitted to the inner wall of the phase change channel, and the liquid suction core is arranged around the redundant space. Therefore, the fitted liquid suction core to the inner wall of the phase change channel and the arrangement of the liquid suction core around the redundant space can improve the stability of the liquid suction core within the phase change channel and mitigate the risk of decreased temperature uniformity due to deformation of the liquid suction core.

[0012] In some embodiments, the wicking element includes a porous structure. This porous structure improves the absorption rate of the liquid phase change working fluid, facilitating its distribution throughout the phase change channel and its vaporization under the influence of the higher-temperature battery cells.

[0013] In some embodiments, the porosity of the absorbent core is between 40% and 80%, and / or the permeability of the absorbent core is greater than or equal to 10% Darcy. Thus, by having a porosity between 40% and 80%, and / or a permeability greater than or equal to 10% Darcy, the absorbent core's liquid storage, absorption, and delivery performance are improved, while also maintaining a certain level of structural strength and service life.

[0014] In some embodiments, the portion of the temperature equalization element in contact with a battery cell at a first temperature is designated as a first portion, and the portion in contact with a battery cell at a second temperature is designated as a second portion. The first temperature is higher than the second temperature. The liquid phase change working fluid in the first portion vaporizes under the first temperature to form a gaseous phase change working fluid. The gaseous phase change working fluid enters the second portion within the phase change channel. The gaseous phase change working fluid in the second portion liquefies under the second temperature to form a liquid phase change working fluid. The liquid phase change working fluid then permeates the absorbent core into the first portion. Thus, the liquid phase change working fluid is distributed throughout the first portion by the absorbent core and vaporizes under the influence of the battery cell at the first temperature. Simultaneously, the gaseous phase change working fluid spontaneously distributes throughout the second portion within the phase change channel and liquefies under the influence of the battery cell at the second temperature. Ultimately, the cyclical change of the phase change working fluid's state achieves temperature equalization of multiple battery cells, reducing the temperature difference between the multiple battery cells and improving the overall performance of the battery device.

[0015] In some embodiments, the area of ​​the portion of the wick corresponding to the first portion is greater than the area of ​​the portion of the wick corresponding to the second portion; and / or the thickness of the portion of the wick corresponding to the first portion is greater than the thickness of the portion of the wick corresponding to the second portion; and / or the porosity of the portion of the wick corresponding to the first portion is greater than the porosity of the portion of the wick corresponding to the second portion. Therefore, the area, thickness, and porosity of the portion of the wick corresponding to the first portion are greater than those of the portion of the wick corresponding to the second portion, which enhances the evaporative heat transfer of the liquid phase change working fluid at the first portion and enhances the contact condensation of the gaseous phase change working fluid at the second portion.

[0016] In some embodiments, the battery device further includes a heat exchanger having heat exchange channels for the flow of heat exchange fluid, and multiple battery cells contacting the heat exchanger. Thus, the heat exchanger having heat exchange channels for the flow of heat exchange fluid, and multiple battery cells in contact with the heat exchanger, allows the heat exchange fluid within the heat exchange channels to cool the multiple battery cells, improving the cooling efficiency of the battery device.

[0017] In some embodiments, the heat exchanger and the temperature homogenizer are integrally formed, and the heat exchange channel and the phase change channel are spaced apart from each other. Therefore, the integral forming of the heat exchanger and the temperature homogenizer, and the spacing between the heat exchange channel and the phase change channel, improves the production efficiency of the heat exchanger and the temperature homogenizer, as well as the assembly efficiency of the battery device, etc.

[0018] In some embodiments, the heat exchanger and the temperature equalization element are separately configured, and the heat exchanger and the temperature equalization element are connected. Therefore, the separate configuration of the heat exchanger and the temperature equalization element, and their connection, improves the flexibility of assembly.

[0019] In some embodiments, the battery device includes a housing assembly having a receiving groove, within which a plurality of battery cells are disposed. A heat exchanger covers the opening of the receiving groove and is connected to the housing assembly. Thus, by covering the opening of the receiving groove and connecting to the housing assembly, the heat exchanger can be kept relatively fixed to the battery cells via the housing assembly, improving the cooling stability and temperature uniformity of the heat exchanger over the multiple battery cells.

[0020] In some embodiments, the heat exchange channel includes multiple branch channels, and the number of phase change channels is also multiple. Each phase change channel is provided with the liquid wick and the phase change working fluid, and there is at least one phase change channel between two branch channels. Therefore, having at least one phase change channel between two branch channels allows for improved heat exchange efficiency and temperature homogenization efficiency of the battery cells through the rational arrangement of the temperature homogenization components and heat exchange elements.

[0021] In some embodiments, the plurality of branch channels and the phase change channel together define at least one cooling region. Within the same cooling region, each branch channel extends along a first direction, and the plurality of branch channels are spaced apart in a second direction perpendicular to the first direction. The phase change channel extends along the first direction, and at least one phase change channel is present between two branch channels that are at least partially spaced apart in the second direction. Thus, having at least one phase change channel between two branch channels that are at least partially spaced apart in the second direction allows for a more efficient heat exchange and temperature uniformity of the battery cells through the rational arrangement of the phase change channels and heat exchange channels.

[0022] In some embodiments, the number of cooling zones is multiple, and the multiple cooling zones are spaced apart in the first direction. Therefore, by arranging multiple cooling zones spaced apart in the first direction, heat exchange and temperature equalization can be performed on a larger number of battery cells simultaneously, reducing the temperature difference between multiple battery cells and improving the overall performance of the battery device.

[0023] In some embodiments, the heat exchanger is provided with a fluid inlet and a fluid outlet, which are respectively connected to the heat exchange channel. The fluid inlet and the fluid outlet are located on one side of the cooling region in the second direction. Therefore, having the fluid inlet and the fluid outlet on one side of the cooling region in the second direction facilitates the replacement of the fluid within the heat exchange channel, thereby improving the cooling efficiency for multiple battery cells.

[0024] In some embodiments, the battery cell includes two first sidewalls disposed opposite to each other in the first direction and two second sidewalls disposed opposite to each other in the second direction, wherein the area of ​​the first sidewalls is larger than the area of ​​the second sidewalls. Thus, the larger area of ​​the first sidewalls of the battery cell being disposed opposite to each other in the first direction allows the first sidewalls to be perpendicular to the direction in which the phase change channel extends, facilitating the improvement of the temperature equalization efficiency among multiple battery cells arranged in the first direction using a temperature equalization component.

[0025] In some embodiments, a plurality of battery cells are divided into at least one column, and the battery cells in the same column are arranged sequentially along the first direction. In the plurality of battery cells in the same column, a heat insulation element is sandwiched between the first sidewalls of two adjacent battery cells. Thus, the heat insulation element sandwiched between the first sidewalls of two adjacent battery cells can reduce the risk of thermal propagation in the event of thermal runaway between two adjacent battery cells.

[0026] In some embodiments, the plurality of battery cells are divided into multiple columns, and the battery cells in different columns are arranged sequentially along the second direction, with the second sidewalls of the battery cells in adjacent columns being bonded together. Therefore, the bonding of the second sidewalls of the battery cells in adjacent columns can improve heat transfer between the battery cells in adjacent columns, thereby improving the temperature uniformity efficiency between the battery cells.

[0027] In some embodiments, the plurality of battery cells are divided into at least one battery group, and at least two battery cells in the same battery group are arranged sequentially. The temperature equalization element simultaneously contacts at least two battery cells in the same battery group. This simultaneous contact of the temperature equalization element with at least two battery cells in the same battery group simplifies the structural design of the battery device, while also enabling temperature equalization of multiple battery cells, reducing the temperature difference between the multiple battery cells, and improving the overall performance of the battery device.

[0028] In some embodiments, the battery cell is columnar, and at least two battery cells in the same battery group are arranged radially sequentially, with the temperature equalization element contacting the end walls of at least two battery cells in the same battery group. Thus, the columnar shape of the battery cell and the contact of the temperature equalization element with the end walls of at least two battery cells in the same battery group simplify the structural design of the battery device, while also enabling temperature equalization of multiple battery cells, reducing the temperature difference between multiple battery cells, and improving the overall performance of the battery device.

[0029] In some embodiments, the number of battery groups is multiple, and the temperature equalization element is located between two adjacent groups of battery groups. The temperature equalization element simultaneously contacts the sidewalls of the battery cells in two adjacent groups of battery groups. Therefore, by having the temperature equalization element simultaneously contact the sidewalls of the battery cells in two adjacent groups of battery groups, it can act on a larger number of battery cells at the same time, further simplifying the structural design of the battery device, reducing the temperature difference between multiple battery cells, and improving the overall performance of the battery device.

[0030] In some embodiments, the battery cell includes two first sidewalls, two second sidewalls, and two endwalls arranged opposite to each other. The area of ​​the first sidewalls is larger than the areas of the second sidewalls and the endwalls. Multiple battery cells in the battery group are arranged sequentially along a direction perpendicular to the first sidewalls. Thus, the sequential arrangement of multiple battery cells along the first sidewalls improves the energy density of the battery device, simplifies the arrangement of the temperature-equalizing element, and enhances the overall performance of the battery device.

[0031] In some embodiments, the temperature equalization element contacts the end wall or the second side wall of at least two battery cells in the same battery group. This contact simplifies the structural design of the battery device and allows for temperature equalization of multiple battery cells, reducing the temperature difference between them and improving the overall performance of the battery device.

[0032] In some embodiments, the number of battery groups is multiple, and the temperature equalization element is located between two adjacent groups of battery groups. The temperature equalization element simultaneously contacts the second sidewalls of at least two battery cells in two adjacent groups of battery groups. Therefore, by simultaneously contacting the second sidewalls of at least two battery cells in two adjacent groups of battery groups, the temperature equalization element can act on a larger number of battery cells at the same time, further simplifying the structural design of the battery device, reducing the temperature difference between multiple battery cells, and improving the overall performance of the battery device.

[0033] In some embodiments, the battery cell includes two first sidewalls, two second sidewalls, and two endwalls arranged opposite to each other. The area of ​​the first sidewalls is larger than the areas of the second sidewalls and the endwalls. Multiple battery cells of the battery group are arranged sequentially along a direction perpendicular to the second sidewalls. The heat spreader contacts the first sidewalls of at least two battery cells within the same battery group. Thus, the sequential arrangement of multiple battery cells along the second sidewalls improves the energy density of the battery device through this regular arrangement, while also simplifying the arrangement of the heat spreader and improving the overall performance of the battery device.

[0034] In some embodiments, the battery cell includes a positive terminal and a negative terminal spaced apart from each other, the positive terminal and the negative terminal being located on one side of one of the end walls. Thus, having the positive and negative terminals on the same side of one end wall facilitates electrical connection between the battery cell and other components via the positive and negative terminals, and reduces interference between the temperature equalizer and the positive and negative terminals of the battery cell.

[0035] In some embodiments, the temperature equalization element also contacts at least one of the positive and negative terminals. This allows the temperature difference between at least one of the positive and negative terminals and the rest of the battery cell to be reduced.

[0036] In some embodiments, the battery cell includes a positive terminal and a negative terminal, with the positive terminal located on one side of one end wall and the negative terminal located on the other side of the end wall. This arrangement, with the positive terminal on one end wall and the negative terminal on the other, reduces the risk of interference between the positive and negative terminals when the battery cell is electrically connected to other components.

[0037] In some embodiments, the temperature equalization element also contacts the positive and negative terminals. This allows the temperature difference between the positive and negative terminals and the rest of the battery cell to be reduced.

[0038] To address the aforementioned problems, this application provides an electrical device, which includes the battery device described above. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments 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 these drawings without creative effort.

[0040] Figure 1 This is a structural schematic diagram of a vehicle according to one or more embodiments;

[0041] Figure 2 This is a first structural schematic diagram of a battery device according to one or more embodiments;

[0042] Figure 3 yes Figure 2 The diagram shows a first cross-sectional view of the battery device along the AA direction.

[0043] Figure 4 yes Figure 2 The diagram shows a second cross-sectional view of the battery device along the AA direction.

[0044] Figure 5 yes Figure 2 The diagram shows a third section of the battery device along the AA direction;

[0045] Figure 6 yes Figure 2 The diagram shows the fourth section of the battery device along the AA direction;

[0046] Figure 7 This is a second structural schematic diagram of a battery device according to one or more embodiments;

[0047] Figure 8 This is an exploded structural diagram of a battery device according to one or more embodiments;

[0048] Figure 9 This is a schematic diagram of a heat exchanger and a temperature equalization element integrally arranged according to one or more embodiments of this application;

[0049] Figure 10 yes Figure 9 The diagram shows a cross-sectional view of the integrated heat exchanger and temperature equalization unit along the BB direction.

[0050] Figure 11 This is a schematic diagram of a battery cell located on a heat exchanger according to one or more embodiments;

[0051] Figure 12 This is a first structural schematic diagram of the arrangement of battery cells and temperature-equalizing elements according to one or more embodiments;

[0052] Figure 13 This is a first structural schematic diagram of a battery cell according to one or more embodiments;

[0053] Figure 14 This is a second structural schematic diagram showing the arrangement of battery cells and temperature-equalizing elements according to one or more embodiments;

[0054] Figure 15 This is a third structural schematic diagram showing the arrangement of battery cells and temperature-sensing components according to one or more embodiments;

[0055] Figure 16 This is a schematic diagram of the second structure of a battery cell according to one or more embodiments;

[0056] Figure 17 This is a third structural schematic diagram of a battery cell according to one or more embodiments;

[0057] Figure 18 This is a fourth structural schematic diagram showing the arrangement of battery cells and temperature-sensing components according to one or more embodiments;

[0058] Figure 19 This is a fifth structural schematic diagram showing the arrangement of battery cells and temperature-sensing components according to one or more embodiments.

[0059] Reference numerals: Vehicle 1; Battery unit 2; Controller 3; Motor 4; Temperature equalization assembly 10; Temperature equalization element 100; Phase change channel 110; Redundancy space 111; Microgroove 120; Liquid absorbent core 200; Phase change working fluid 210; Bundle strip 400; First part 11; Second part 12; Cooling area 13; Battery cell 20; Battery group 201; First sidewall 21; Second sidewall 22; End wall 23; Positive terminal 24; Negative terminal 25; Heat exchanger 30; Heat exchange channel 300; Branch channel 310; Fluid inlet 320; Fluid outlet 330; Thermal insulation element 40; Housing assembly 50; Receptacle 51; First direction X; Second direction Y. Detailed Implementation

[0060] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0062] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0063] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0064] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0065] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0066] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0067] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0068] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0069] A battery device consists of multiple battery cells. During the charging and discharging process, the temperature difference between the multiple battery cells may be large due to factors such as their different positions, resulting in poor overall temperature uniformity of the battery device and thus poor overall performance of the battery device.

[0070] To address the technical problems existing in related technologies, this application provides a battery device and an electrical device. The battery device includes multiple battery cells and a temperature equalization assembly. The temperature equalization assembly includes a temperature equalization element, a liquid absorbent core, and a phase change working medium. The temperature equalization element is in contact with at least two battery cells and forms a phase change channel. The liquid absorbent core is accommodated in at least a portion of the phase change channel, and the phase change working medium is located within the phase change channel. The liquid absorbent core is used to wet the liquid phase change working medium, thereby achieving temperature equalization of multiple battery cells through the state change of the phase change working medium, reducing the temperature difference between multiple battery cells, and improving the overall performance of the battery device.

[0071] Batteries, as discussed in this field, can be categorized into primary batteries and rechargeable batteries based on whether they are rechargeable. Primary batteries, also known as "use-and-discard" batteries or galvanic cells, cannot be recharged after their charge is depleted and must be discarded. Rechargeable batteries, also called secondary batteries or rechargeable batteries, differ from primary batteries in their manufacturing materials and processes. Their advantage lies in their ability to be cycled multiple times after charging, and their output current capacity is higher than most primary batteries. Common types of rechargeable batteries include lead-acid batteries, nickel-metal hydride batteries, and lithium-ion batteries. Lithium-ion batteries are lightweight, have a large capacity (1.5 to 2 times that of a nickel-metal hydride battery of the same weight), no memory effect, and a very low self-discharge rate, thus enjoying widespread use despite their relatively high price. Lithium-ion batteries are also widely used in pure electric vehicles and hybrid vehicles. While the capacity of lithium-ion batteries used in these applications is relatively lower, they offer a larger output and charging current, and a longer lifespan, but at a higher cost.

[0072] The batteries described in the embodiments of this application refer to rechargeable batteries or disposable batteries. The embodiments disclosed in this application will be described below primarily using lithium-ion batteries as an example. It should be understood that the embodiments disclosed in this application are applicable to any other suitable type of rechargeable battery. The batteries mentioned in the embodiments disclosed in this application can be directly or indirectly used in suitable devices to power those devices.

[0073] This application provides an electrical device, which may include, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys may include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc. The electrical device may include a battery, which can provide electrical power to achieve the corresponding function.

[0074] This application also provides an electric vehicle that may include a battery device.

[0075] Please refer to Figure 1 , Figure 1 This is a structural schematic diagram of a vehicle according to one or more embodiments.

[0076] Vehicle 1 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 2 is installed inside vehicle 1, and the battery device 2 can be located at the bottom, front, or rear of vehicle 1. The battery device 2 can be used to power vehicle 1; for example, it can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 3 and a motor 4. The controller 3 controls the battery device 2 to supply power to the motor 4, for example, to meet the power needs of vehicle 1 during starting, navigation, and driving.

[0077] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0078] To improve the performance of electrical devices, this application also provides a battery device, see [link to relevant documentation]. Figure 2 and Figure 3 , Figure 2 This is a first structural schematic diagram of a battery device according to one or more embodiments. Figure 3 yes Figure 2 The diagram shows a first cross-sectional view of the battery device along the AA direction.

[0079] The battery device 2 includes multiple battery cells 20 and a temperature equalization assembly 10. The temperature equalization assembly 10 includes a temperature equalization element 100, a liquid absorbent wick 200, and a phase change working medium 210. The temperature equalization element 100 is in contact with at least two battery cells 20 and forms a phase change channel 110. The liquid absorbent wick 200 is accommodated in at least a portion of the phase change channel 110. The phase change working medium is located within the phase change channel 110. The phase change working medium can switch between liquid and gaseous states under the influence of the temperature of the battery cells 20. The liquid absorbent wick 200 is used to wet the liquid phase change working medium 210.

[0080] The battery cell 20 comprises multiple cells, which can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple battery cells 20 are connected in both series and parallel configurations. Alternatively, multiple battery cells 20 can first be connected in series, parallel, or a combination thereof to form a battery module, and then these battery modules can be connected in series, parallel, or a combination thereof to form a whole. The battery device 2 may also include other structures, such as a busbar component for electrical connection between multiple battery cells 20. A battery cell 20 is the smallest unit comprising the battery device 2. A battery cell 20 may include a casing, electrode assemblies, and other functional components. The casing includes end caps and a housing. An end cap is a component that closes onto the opening of the housing to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap may be adapted to the shape of the housing. Optionally, the end cap may be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap is less prone to deformation under pressure and impact, giving the battery cell 20 higher structural strength and improved safety performance.

[0081] The end cap may be provided with functional components such as electrode terminals. The electrode terminals can be used for electrical connection with the electrode assembly to output or input electrical energy to the battery cell 20. In some embodiments, the electrode terminals may include terminals. Terminals may include positive and negative terminals for current output and connection to external circuits. In some embodiments, the end cap may also be provided with an explosion-proof component for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap can be made of various materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, and plastic. In some embodiments, an insulating component may be provided on the inner side of the end cap to isolate the electrical connection components within the housing from the end cap, reducing the risk of short circuits. For example, the insulating component may be plastic, rubber, etc. The housing is an assembly used to cooperate with the end cap to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly, electrolyte, and other components. The housing and end cap may be separate components, and an opening may be provided on the housing. The end cap closes the opening at the opening to form the internal environment of the battery cell 20. The end cap and housing can be integrated, without limitation. Specifically, the end cap and housing can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing, the end cap is then closed. The housing can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing can be determined according to the specific shape and size of the electrode assembly. The housing material can be various, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The electrode assembly is the component in the battery cell 20 where the electrochemical reaction occurs. The housing can contain one or more electrode assemblies. The electrode assembly is mainly formed by winding or stacking positive and negative electrode plates, and usually a separator is provided between the positive and negative electrode plates. The active material portions of the positive and negative electrode plates constitute the main body of the electrode assembly, and the non-active material portions of the positive and negative electrode plates each constitute a tab. The positive and negative electrode tabs can be located together at one end of the main body or at two separate ends of the main body. During the charging and discharging process of a battery, the positive and negative active materials react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0082] The temperature equalizer 100 may have a hollow structure, and a phase change channel 110 is formed inside the temperature equalizer 100. The phase change channel 110 is a sealed space. The phase change working medium 210 may include, but is not limited to, paraffin-based phase change media, fatty acid-based phase change media, hydrated salt-based phase change media, composite phase change media, novel phase change media, etc. The phase change working medium 210 may be in liquid or gaseous state. The gaseous phase change working medium 210 can be liquefied at low temperatures, and the liquid phase change working medium 210 can be vaporized at high temperatures. The liquid absorber 200 may have specific porosity and permeability. The liquid absorber 200 can absorb the liquid phase change working medium 210, and the liquid phase change working medium 210 can permeate the liquid absorber 200. The liquid absorber 200 may be fixed in the phase change channel 110 by welding, bonding, interference fitting, or other methods. The liquid-absorbing core 200 is located within at least a portion of the phase change channel 110. For example, the liquid-absorbing core 200 may contain all of the phase change channel 110, or it may contain only a portion of the phase change channel 110, while the remaining portion of the liquid-absorbing core 200 is empty. The liquid phase change working medium 210 permeates the liquid-absorbing core 200, while the gaseous phase change working medium 210 diffuses into the empty portion of the phase change channel 110 or into the voids inside the liquid-absorbing core 200. At least two battery cells 20 are in contact with different positions on the temperature equalization element 100. These two battery cells 20 can exchange heat with the temperature equalization element 100. For example, the projections of the at least two battery cells 20 on the temperature equalization element 100 at least partially overlap with the projection of the liquid wick 200 on the temperature equalization element 100. When a significant temperature difference exists between the at least two battery cells 20, the liquid phase change working fluid 210 within the temperature equalization element 100 can vaporize due to the temperature influence of the hotter battery cell 20 when it comes into contact with the temperature equalization element 100. The gaseous phase change working medium 210 can move within the phase change channel 110 to the location of the battery cell 20 with a lower temperature. The gaseous phase change working medium 210 within the temperature equalization element 100 can be liquefied by the temperature influence of the lower-temperature battery cell 20. The liquefied phase change working medium 210 can wet the liquid absorber 200 and diffuse to the higher-temperature battery cell 20 under the action of the liquid absorber 200. The gaseous phase change working medium 210 and the liquid phase change working medium 210 circulate within the phase change channel 110, realizing heat conduction of the battery cell 20 and reducing the temperature difference between battery cells 20 with different temperatures.

[0083] Through the above embodiments, the temperature equalization element 100 contacts at least two battery cells 20, facilitating heat transfer between the temperature equalization element 100 and the battery cells 20. The temperature equalization element 100 forms a phase change channel 110, and the liquid absorbent wick 200 is accommodated in at least a portion of the phase change channel 110. The liquid absorbent wick 200 is used to wet the liquid phase change working medium 210, which allows the liquid phase change working medium 210 to spread throughout the phase change channel 110 due to the action of the liquid absorbent wick 200 and vaporize under the action of the battery cells 20 at higher temperatures. At the same time, the gaseous phase change working medium 210 spontaneously spreads throughout the phase change channel 110 and liquefies under the action of the battery cells 20 at lower temperatures. Finally, the temperature equalization treatment of multiple battery cells 20 is achieved through the state change of the phase change working medium 210, reducing the temperature difference between multiple battery cells 20 and improving the overall performance of the battery device 2.

[0084] Specifically, the portion of the temperature equalization element 100 that contacts the battery cell 20 at the first temperature is designated as the first portion 11, and the portion of the temperature equalization element 100 that contacts the battery cell 20 at the second temperature is designated as the second portion 12. The first temperature is greater than the second temperature. The liquid phase change working medium 210 located in the first portion 11 vaporizes under the action of the first temperature to form a gaseous phase change working medium 210. The gaseous phase change working medium 210 enters the second portion 12 within the phase change channel 110. The gaseous phase change working medium 210 located in the second portion 12 liquefies under the action of the second temperature to form a liquid phase change working medium 210. The liquid phase change working medium 210 wets the liquid-absorbing core 200 to the first portion 11. During use, the battery cells 20 at different locations exhibit temperature differences. For example, during charging and discharging, the temperature of the battery cells 20 located in the middle is generally higher than that of the battery cells 20 located at the edges. In this embodiment, the area where the hotter battery cell 20 contacts the temperature equalizer 100 is defined as the first part 11, and the area where the cooler battery cell 20 contacts the temperature equalizer 100 is defined as the second part 12. It should be noted that the temperature difference here refers to the relative temperature difference between the two battery cells 20. The phase change working fluid 210 can exist in liquid or gaseous form within the phase change channel 110. The liquid phase change working fluid 210 can evaporate and absorb heat, while the gaseous phase change working fluid 210 can condense upon contact. In some application scenarios, the liquid phase change working fluid 210 is absorbed by the wick 200 and wets the wick 200 to the first part 11 through capillary force. At the first part 11, the wick 200 absorbs the temperature of the battery cell 20 at a first temperature, thus cooling the battery cell 20. This causes the liquid phase change working fluid 210 in the first part 11 to absorb heat and evaporate into a gaseous phase change working fluid 210. The liquid phase change working fluid 210 in the second part 12 is continuously transported to the first part 11. At the same time, the increase in the gaseous phase change working fluid 210 in the first part 11 leads to a phase change in the first part 11. The gas pressure in channel 110 is lower than the gas pressure in the phase change channel 110 of the second part 12. Under the influence of the pressure difference, the gaseous phase change working medium 210 continuously flows from the first part 11 to the second part 12. At the second part 12, the gaseous phase change working medium 210 is liquefied into liquid phase change working medium 210 due to the low temperature of the battery cell 20 at the second temperature, so that it can be absorbed by the liquid absorption core 200 of the second part 12. Finally, the temperature equalization of multiple battery cells 20 is achieved through the cyclic change of the state of the phase change working medium 210, reducing the temperature difference between multiple battery cells 20 and improving the overall performance of the battery device 2.

[0085] Furthermore, the area of ​​the partial wick 200 corresponding to the first part 11 is larger than the area of ​​the partial wick 200 corresponding to the second part 12; and / or the thickness of the partial wick 200 corresponding to the first part 11 is greater than the thickness of the partial wick 200 corresponding to the second part 12; and / or the porosity of the partial wick 200 corresponding to the first part 11 is greater than the porosity of the partial wick 200 corresponding to the second part 12. The area of ​​the wick 200 can be understood as the contact area between the wick 200 and the temperature equalizer 100. For example, if the area of ​​the partial wick 200 corresponding to the first part 11 is greater than the area of ​​the partial wick 200 corresponding to the second part 12, it can be understood that the contact area between the wick 200 in the first part 11 region and the side of the temperature equalizer 100 that contacts the battery cell 20 is greater than the contact area between the wick 200 in the second part 12 region and the side of the temperature equalizer 100 that contacts the battery cell 20. The thickness of the liquid absorber 200 can be understood as the thickness dimension of the liquid absorber 200 in the direction from the side of the temperature equalizer 100 near the battery cell 20 to the side away from the battery cell 20, such as... Figure 3 As shown, the thickness of the absorbent core 200 can be understood as the thickness between the upper and lower plates, or the thickness of the absorbent core 200 can also be understood as... Figure 2 The cross-sectional area of ​​the liquid-absorbing core 200 after being cut along the AA direction. The area of ​​the liquid-absorbing core 200 corresponding to the first part 11 is larger than the area of ​​the liquid-absorbing core 200 corresponding to the second part 12, and the thickness of the liquid-absorbing core 200 corresponding to the first part 11 is greater than the thickness of the liquid-absorbing core 200 corresponding to the second part 12, and the porosity of the liquid-absorbing core 200 corresponding to the first part 11 is greater than the porosity of the liquid-absorbing core 200 corresponding to the second part 12. This allows for a greater amount of liquid phase change working fluid 210 in the region of the first part 11, and a larger phase change channel 110 in the region of the second part 12 to accommodate more gaseous phase change working fluid 210. This makes it easier to enhance the evaporation heat transfer of the liquid phase change working fluid 210 in the first part 11, and to enhance the contact condensation of the gaseous phase change working fluid 210 in the second part 12.

[0086] In some other embodiments, the portion of the temperature equalizer 100 that contacts the battery cell 20 at the third temperature may also serve as a third portion, wherein the third temperature is greater than the second temperature but less than the first temperature, and the area of ​​the partial liquid-absorbing core 200 corresponding to the third portion is greater than the area of ​​the partial liquid-absorbing core 200 corresponding to the second portion 12 but less than the area of ​​the partial liquid-absorbing core 200 corresponding to the first portion 11; and / or the thickness of the partial liquid-absorbing core 200 corresponding to the third portion is greater than the thickness of the partial liquid-absorbing core 200 corresponding to the second portion 12 but less than the thickness of the partial liquid-absorbing core 200 corresponding to the first portion 11; and / or the porosity of the partial liquid-absorbing core 200 corresponding to the third portion is greater than the porosity of the partial liquid-absorbing core 200 corresponding to the second portion 12 but less than the porosity of the partial liquid-absorbing core 200 corresponding to the first portion 11.

[0087] In some embodiments, the portion of the phase change channel 110 not filled with the wick 200 serves as a redundant space 111. Both the wick 200 and the redundant space 111 extend along a first direction X. At least two battery cells 20 are arranged along the first direction X and simultaneously contact the temperature equalization element 100. The first direction X can be the length direction of the temperature equalization element 100. Thermal insulation can be performed between two adjacent battery cells 20 arranged along the first direction X. The at least two battery cells 20 can be any two or more battery cells 20 arranged along the first direction X, for example, two adjacent battery cells 20 arranged along the first direction X. The wick 200 and the redundant space 111 both extend along the first direction X. The arrangement of at least two battery cells 20 along the first direction X and simultaneously contacting the temperature equalization element 100 facilitates the action of the liquid and gaseous phase change working fluid 210 on the battery cells 20 arranged along the first direction X, further improving the temperature equalization efficiency of the battery cells 20 and reducing the temperature difference between multiple battery cells 20, thereby improving the overall performance of the battery device 2.

[0088] See Figure 4 , Figure 4 yes Figure 2 The diagram shows a second cross-sectional view of the battery device along the AA direction.

[0089] The temperature equalization element 100 has microgrooves 120 on the bottom wall of the phase change channel 110. The liquid absorber 200 covers the microgrooves 120, which extend along the first direction X. The microgrooves 120 can be V-shaped, and there can be multiple microgrooves 120. Multiple microgrooves 120 can be spaced apart from each other. The microgrooves 120 extend along the first direction X and are covered by the liquid absorber 200, which allows the liquid phase change working medium 210 that is not absorbed by the liquid absorber 200 to flow along the first direction X with the assistance of the microgrooves 120. This makes it easier for the liquid phase change working medium 210 to act on the battery cells 20 arranged along the first direction X, further improving the temperature equalization efficiency of the battery cells 20, reducing the temperature difference between multiple battery cells 20, and improving the overall performance of the battery device 2.

[0090] See Figure 5 , Figure 5 yes Figure 2 The diagram shows a third section of the battery device along the AA direction.

[0091] The redundant space 111 is located on both sides of the liquid-absorbing core 200 in the second direction Y, which is perpendicular to the first direction X. The redundant space 111, located on both sides of the liquid-absorbing core 200 in the second direction Y, facilitates the smooth entry of the liquid phase change working medium 210 into the redundant space 111 after vaporization. This also makes it easier for the liquid and gaseous phase change working medium 210 to act on the battery cells 20 arranged along the first direction X, improving the temperature equalization efficiency of the battery cells 20 and reducing the temperature difference between multiple battery cells 20, thereby improving the overall performance of the battery device 2.

[0092] Furthermore, the temperature equalization assembly 10 also includes a bundle-shaped strip 400, which is sandwiched between the liquid-absorbing core 200 and the top wall of the temperature equalization component 100. The bundle-shaped strip 400 can extend along the first direction X. The bundle-shaped strip 400 is used to limit excessive deformation of the liquid-absorbing core 200. During the manufacturing process, a groove can be stamped on the plate to form a groove, and then the liquid-absorbing core 200 is installed in the groove. The bundle-shaped strip 400 is installed on the side of the liquid-absorbing core 200 away from the bottom wall of the groove. Finally, the plate body is pressed on the side of the bundle-shaped strip 400 away from the liquid-absorbing core 200 and the groove opening is sealed to form the temperature equalization assembly 10. In this embodiment, the bundle-shaped strip 400 is sandwiched between the liquid-absorbing core 200 and the top wall of the temperature equalization component 100, which can limit excessive deformation of the liquid-absorbing core 200 to block at least part of the redundant space 111.

[0093] See Figure 6 , Figure 6 yes Figure 2 The diagram shows a fourth section of the battery device along the AA direction.

[0094] The absorbent core 200 is located on both sides of the redundant space 111 at least in the second direction Y perpendicular to the first direction X. The absorbent core 200 may include two parts, with the redundant space 111 located between the two parts in the second direction Y. The two parts can be fixed to the two side walls of the phase change channel 110, which facilitates the smooth entry of the liquid phase change working medium 210 into the redundant space 111 after vaporization, and the absorption of the gaseous phase change working medium 210 by the absorbent core 200 after liquefaction. This makes it easier for the liquid and gaseous phase change working medium 210 to act on the battery cells 20 arranged along the first direction X, further improving the temperature equalization efficiency of the battery cells 20 and reducing the temperature difference between multiple battery cells 20, thereby improving the overall performance of the battery device 2.

[0095] Furthermore, the liquid suction core 200 is fitted to the inner wall of the phase change channel 110, and the liquid suction core 200 is arranged around the redundant space 111. The liquid suction core 200 can be U-shaped, and the specific shape of the liquid suction core 200 can be set according to the specific structure of the phase change channel 110. The fitting of the liquid suction core 200 to the inner wall of the phase change channel 110 and the arrangement of the liquid suction core 200 around the redundant space 111 facilitates the smooth entry of the liquid phase change working fluid 210 into the redundant space 111 after vaporization, and the absorption of the gaseous phase change working fluid 210 by the liquid suction core 200 after liquefaction. This improves the stability of the liquid suction core 200 in the phase change channel 110 and mitigates the risk of decreased temperature uniformity due to deformation of the liquid suction core 200.

[0096] In some embodiments, the absorbent core 200 includes a porous structure. The absorbent core 200 can be made of a porous medium material, including but not limited to a metal braided structure, a metal sintered and etched structure, or a porous ceramic structure, etc., to improve the absorption rate of the absorbent core 200 for the liquid phase change working medium 210, so that the liquid phase change working medium 210 can be distributed throughout the phase change channel 110 due to the action of the absorbent core 200 and vaporized under the action of the battery cell 20 at a higher temperature.

[0097] Specifically, the porosity of the absorbent core 200 is between 40% and 80%, and / or the permeability of the absorbent core 200 is greater than 10% Darcy. The porosity of the absorbent core 200 can be between 40% and 70%, between 50% and 80%, between 50% and 70%, between 55% and 65%, between 60% and 70%, or between 70% and 80%, etc. Specifically, the porosity of the absorbent core 200 can be between 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or 80%. The permeability of the absorbent core 200 can be greater than or equal to 10% Darcy and less than or equal to 60% Darcy, greater than or equal to 15% Darcy and less than or equal to 40% Darcy, greater than or equal to 10% Darcy and less than or equal to 30% Darcy, greater than or equal to 15% Darcy and less than or equal to 20% Darcy, etc. Specifically, the permeability of the absorbent core 200 can be 10% Darcy, 12% Darcy, 14% Darcy, 16% Darcy, 18% Darcy, 20% Darcy, or 25% Darcy, etc. Therefore, the porosity of the absorbent core 200 is between 40% and 80%, and / or the permeability is greater than or equal to 10% Darcy. This improves the liquid storage, absorption, and delivery performance of the absorbent core 200, while also ensuring a certain level of structural strength and service life.

[0098] See Figure 7 , Figure 7 This is a second structural schematic diagram of a battery device according to one or more embodiments.

[0099] The battery device 2 also includes a heat exchanger 30, which has a heat exchange channel 300 for supplying heat exchange fluid. Multiple battery cells 20 are in contact with the heat exchanger 30. The heat exchanger 30 can simultaneously exchange heat with multiple battery cells 20 for thermal management of the battery cells 20. The heat exchanger 30 may have the heat exchange channel 300 inside. For example, during the manufacturing process of the heat exchanger 30, a groove corresponding to the heat exchange channel 300 can be formed by stamping a sheet metal, and then a top cover plate can be placed on one side of the stamped sheet metal to seal the groove opening, resulting in a heat exchanger 30 with the heat exchange channel 300. In other embodiments, the heat exchange channel 300 can also be provided on the heat exchanger 30 in other ways, such as embedding a flexible tube on the outside of the heat exchanger 30 to form the heat exchange channel 300 within the tube. The heat exchange channel 300 can be used to supply heat exchange fluid, which can include, but is not limited to, airflow, cooling water, cooling oil, or deionized water. When cooling of the battery cell 20 is required, a heat exchange fluid with a temperature lower than that of the battery cell 20 can be injected into the heat exchange channel 300; when heating of the battery cell 20 is required, a heat exchange fluid with a temperature higher than that of the battery cell 20 can be injected into the heat exchange channel 300. Thus, the heat exchange component 30 is provided with a heat exchange channel 300 for supplying heat exchange fluid. Multiple battery cells 20 are in contact with the heat exchange component 30, and the heat exchange fluid in the heat exchange channel 300 can cool the multiple battery cells 20, thereby improving the cooling efficiency of the battery device 2.

[0100] See Figure 8 , Figure 8 This is an exploded structural diagram of a battery device according to one or more embodiments.

[0101] The battery device 2 includes a housing assembly 50, which has a receiving groove 51. Multiple battery cells 20 are disposed within the receiving groove 51. A heat exchanger 30 covers the opening of the receiving groove 51 and is connected to the housing assembly 50. Figure 8As shown, the housing assembly 50 may include a frame structure and a top cover. The frame structure may be arranged in a ring shape, and the top cover may cover an opening in the frame structure to form a receiving groove 51 in the housing assembly 50. Multiple battery cells 20 are disposed within the receiving groove 51, and a heat exchanger 30 covers the opening of the receiving groove 51, allowing the heat exchanger 30 to contact the multiple battery cells 20 for thermal management. In some embodiments, the housing assembly 50 may further include a bottom protective plate, located on the side of the heat exchanger 30 away from the multiple battery cells 20. The bottom protective plate is fixedly connected to the housing assembly 50, thus providing better protection for the heat exchanger 30. Therefore, the heat exchanger 30, covering the opening of the receiving groove 51 and connected to the housing assembly 50, allows the heat exchanger 30 to remain relatively fixed to the battery cells 20 through the housing assembly 50, improving the cooling stability and temperature uniformity of the heat exchanger 30 over the multiple battery cells 20.

[0102] The heat exchanger 30 and the temperature equalization element 100 are separately configured, but connected. The temperature equalization element 100 can be located on the adjacent side of multiple battery cells 20 near the heat exchanger 30 and directly connected to the heat exchanger 30, or indirectly connected through multiple battery cells 20. Alternatively, the temperature equalization element 100 can be located on the side of multiple battery cells 20 away from the heat exchanger 30 and indirectly connected to the heat exchanger 30 through multiple battery cells 20, or the temperature equalization element 100 and the heat exchanger 30 can be located on the same side of multiple battery cells 20 and fixedly connected to the heat exchanger 30. Furthermore, the temperature equalization element 100 can be further embedded within the heat exchanger 30. Thus, the separate configuration of the heat exchanger 30 and the temperature equalization element 100, and their connection, improves the flexibility of their assembly.

[0103] The heat exchanger 30 and the temperature equalization element 100 can also be a single, integral structure. (See also...) Figure 9 and Figure 10 , Figure 9 This is a schematic diagram of a heat exchanger and a temperature equalization element integrally configured according to one or more embodiments of this application. Figure 10 yes Figure 9 The diagram shows a cross-sectional view of the integrated heat exchanger and temperature equalization unit along the BB direction.

[0104] The heat exchanger 30 and the temperature equalization element 100 are integrally formed, and the heat exchange channel 300 and the phase change channel 110 are spaced apart from each other. In this embodiment, the heat exchange channel 300 and the phase change channel 110 can be formed by integrally stamping a sheet metal. For example, during the manufacturing process, a first groove corresponding to the heat exchange channel 300 and a second groove corresponding to the phase change channel 110 can be formed by stamping a sheet metal. Then, a top cover plate is placed on one side of the stamped sheet metal to simultaneously seal the openings of the first groove and the second groove, resulting in an integral component with the heat exchange channel 300 and the phase change channel 110. The phase change channel 110 and the heat exchange channel 300 are spaced apart, allowing the phase change channel 110 and the heat exchange channel 300 to act independently on the battery cell 20. Therefore, the heat exchanger 30 and the temperature equalization element 100 are integrally formed, and the heat exchange channel 300 and the phase change channel 110 are spaced apart from each other, which improves the production efficiency of the heat exchanger 30 and the temperature equalization element 100, as well as the assembly efficiency of the battery device 2, etc.

[0105] In some embodiments, the heat exchange channel 300 includes multiple branch channels 310 and multiple phase change channels 110. Each phase change channel 110 is provided with a liquid wick 200 and a phase change working fluid 210. There is at least one phase change channel 110 between two branch channels 310. The number and corresponding shape of the branch channels 310 can be set according to actual conditions. For example, the number of branch channels 310 may include, but is not limited to, two, three, four, five, or other numbers. The multiple branch channels 310 can be arranged in a specific pattern or randomly. The multiple branch channels 310 can be interconnected, so that the heat exchange fluid in the multiple branch channels 310 can flow to each other. The number of phase change channels 110 is multiple, and these multiple phase change channels 110 can be arranged at intervals. This can be achieved by having at least one phase change channel 110 between two branch flow channels 310, one phase change channel 110 between every two branch flow channels 310, or multiple phase change channels 110 arranged at intervals between every two branch flow channels 310. When the heat exchanger 30 and the temperature equalizer 100 are separately arranged, multiple branch flow channels 310 can be formed in the heat exchanger 30, and then the temperature equalizer 100 can be fixed to the surface of the heat exchanger 30 and located between two branch flow channels 310, so that there is at least one phase change channel 110 between two branch flow channels 310. Therefore, having at least one phase change channel 110 between two branch flow channels 310 allows for improved heat exchange efficiency and temperature equalization efficiency of the battery cell 20 through the proper arrangement of the temperature equalizer 10 and the heat exchanger 30.

[0106] Furthermore, the multiple branch flow channels 310 and the phase change channel 110 are collectively divided into at least one cooling region 13. In the same cooling region 13, each branch flow channel 310 extends along a first direction X, and the multiple branch flow channels 310 are spaced apart in a second direction Y perpendicular to the first direction X. The phase change channel 110 extends along the first direction X, and at least one phase change channel 110 is provided between two branch flow channels 310 that are at least partially spaced apart in the second direction Y. Each phase change channel 110 is spaced apart from the branch flow channels 310, and at least one phase change channel 110 is provided between two branch flow channels 310 that are at least partially spaced apart in the second direction Y. By rationally arranging the phase change channel 110 and the heat exchange flow channel 300, the heat exchange efficiency and temperature uniformity of the battery cell 20 can be further improved.

[0107] Furthermore, there are multiple cooling zones 13, which are spaced apart in the first direction X. By arranging multiple cooling zones 13 spaced apart in the first direction X, heat exchange and temperature equalization can be performed on a larger number of battery cells 20 simultaneously, reducing the temperature difference between the multiple battery cells 20 and improving the overall performance of the battery device 2.

[0108] In some embodiments, the heat exchanger 30 is provided with a fluid inlet 320 and a fluid outlet 330, which are respectively connected to the heat exchange channel 300. The fluid inlet 320 and the fluid outlet 330 are located on one side of the cooling region 13 in the second direction Y. The fluid inlet 320 is used to allow the heat exchange fluid to flow into the heat exchange channel 300, and the fluid outlet 330 is used to allow the heat exchange fluid to flow out of the heat exchange channel 300. The heat exchanger 30 can be connected to a fluid supply device through a connector. The fluid supply device can deliver the heat exchange fluid to the heat exchange channel 300 through the fluid inlet 320 through the connector. After exchanging heat with the battery cell 20, the heat exchange fluid enters the connector through the heat exchange outlet and is delivered to the fluid supply device. The fluid supply device can be used to heat or cool the heat exchange fluid, thereby regulating the temperature of the heat exchange fluid in the heat exchange channel 300. The fluid inlet 320 and the fluid outlet 330 are located on one side of the cooling zone 13 in the second direction Y, which facilitates the replacement of the fluid in the heat exchange channel 300 through the fluid inlet 320 and the fluid outlet 330, thereby improving the cooling efficiency of multiple battery cells 20.

[0109] See Figure 11 , Figure 11 This is a schematic diagram of a battery cell located on a heat exchanger according to one or more embodiments.

[0110] The battery cell 20 includes two first sidewalls 21 arranged opposite each other in the first direction X and two second sidewalls 22 arranged opposite each other in the second direction Y. The area of ​​the first sidewall 21 is larger than the area of ​​the second sidewall 22. In this embodiment, the battery cell 20 can be a prismatic battery cell 20. The outer shell of the prismatic battery cell 20 can have four walls, namely the two first sidewalls 21 and the two second sidewalls 22 arranged opposite each other, and the area of ​​the first sidewall 21 is larger than the area of ​​the second sidewall 22. The two first sidewalls 21 arranged opposite each other are perpendicular to the first direction X, and the branch flow channel 310 extends along the first direction X. This allows the larger area of ​​the first sidewalls 21 of the battery cell 20 to be arranged opposite each other in the first direction X. The first sidewalls 21 are perpendicular to the direction in which the phase change channel 110 extends, which facilitates the improvement of the temperature equalization efficiency among the multiple battery cells 20 arranged in the first direction X by the temperature equalization component 10.

[0111] Furthermore, the multiple battery cells 20 are divided into at least one column, and the battery cells 20 in the same column are arranged sequentially along the first direction X. In the multiple battery cells 20 in the same column, a heat insulation element 40 is sandwiched between the first sidewalls 21 of two adjacent battery cells 20. The multiple battery cells 20 can be divided into multiple columns, such as... Figure 11 As shown, the first sidewall 21 of each battery cell 20 is perpendicular to the first direction X, and the multiple battery cells 20 can be divided into two columns. The multiple battery cells 20 in each column are arranged sequentially along the first direction X. In the multiple battery cells 20 in the same column, at least one heat insulation element 40 is sandwiched between the first sidewall 21 of every two battery cells 20, which can reduce the risk of thermal propagation when thermal runaway occurs between two adjacent battery cells 20. The heat insulation element 40 may include, but is not limited to, a nanomaterial layer, a phase change material layer, a mica layer, and / or a ceramic layer, etc. The heat insulation element 40 can be used to isolate the heat transfer between two adjacent battery cells 20. The phase change channel 110 extends along the first direction X, and the orthogonal projection of at least two battery cells 20 in the same column on the heat exchanger 30 is located on the same phase change channel 110, so that while the heat insulation element 40 isolates two adjacent battery cells 20, the heat exchanger 100 can still perform temperature equalization treatment on multiple battery cells 20.

[0112] Furthermore, the multiple battery cells 20 are divided into multiple columns, with battery cells 20 in different columns arranged sequentially along the second direction Y. The second sidewalls 22 of adjacent columns of battery cells 20 are fitted together. Battery cells 20 in different columns can be aligned in the second direction Y, such as... Figure 11As shown, multiple battery cells 20 can be regularly arranged in multiple rows and columns. The second sidewalls 22 of battery cells 20 in different columns are attached together. Even if the phase change channel 110 extends along the first direction X and the projections of battery cells 20 in different columns on the heat exchanger 30 are not on the same phase change channel 110, the battery cells 20 in different columns can spontaneously carry out heat transfer to achieve temperature equalization, thereby improving the temperature equalization efficiency between battery cells 20.

[0113] In some embodiments, the multiple battery cells 20 may be grouped, and then the battery cells 20 in different groups may undergo temperature equalization treatment, see [reference]. Figure 12 , Figure 12 This is a first structural schematic diagram of the arrangement of battery cells and temperature-sensing components according to one or more embodiments.

[0114] Multiple battery cells 20 are divided into at least one battery group 201. At least two battery cells 20 in the same battery group 201 are arranged sequentially, and the temperature equalization element 100 simultaneously contacts at least two battery cells 20 in the same battery group 201. Each battery group 201 includes at least two battery cells 20, arranged sequentially in the same direction, such as along a first direction X or a second direction Y. Adjacent battery cells 20 can be attached together or spaced apart. The number of temperature equalization elements 100 can be one or more; for example, each battery group 201 can correspond to one or more temperature equalization elements 100. Each temperature equalization element 100 can simultaneously contact at least two battery cells 20 in the same battery group 201. Therefore, the simultaneous contact of the temperature equalization element 100 with at least two battery cells 20 in the same battery group 201 simplifies the structural design of the battery device 2, while also enabling temperature equalization of multiple battery cells 20, reducing the temperature difference between multiple battery cells 20, and improving the overall performance of the battery device 2.

[0115] Combination Figure 13 , Figure 13 This is a first structural schematic diagram of a battery cell according to one or more embodiments.

[0116] Each battery cell 20 includes two first sidewalls 21, two second sidewalls 22, and two endwalls 23 arranged opposite to each other. The area of ​​the first sidewalls 21 is larger than the area of ​​the second sidewalls 22 and the area of ​​the endwalls 23. Multiple battery cells 20 in the battery group 201 are arranged sequentially along a direction perpendicular to the first sidewalls 21. The battery cell 20 may include, but is not limited to, cylindrical cells, pouch cells, blade cells, or prismatic cells, etc. The two first sidewalls 21 may be arranged opposite to each other in a first direction X or a second direction Y. The first sidewalls 21 are the larger surface areas of the battery cell 20. Figure 12As shown, there are three battery groups 201, and each battery group 201 includes five battery cells 20. These five battery cells 20 are arranged sequentially along a direction perpendicular to the first sidewall 21. Different battery groups 201 are arranged sequentially along a direction perpendicular to the second sidewall 22. Thus, the multiple battery cells 20 of the battery group 201 are arranged sequentially along a direction perpendicular to the first sidewall 21. The energy density of the battery device 2 is improved by the regular arrangement of multiple battery cells 20. At the same time, it can also simplify the arrangement of the temperature distribution element 100 and improve the overall performance of the battery device 2.

[0117] Further, the temperature equalization element 100 contacts the end wall 23 or the second side wall 22 of at least two battery cells 20 of the same battery pack 201. The number of temperature equalization elements 100 can be one or more; for example, one or more temperature equalization elements 100 may correspond to the same battery pack 201, and each temperature equalization element 100 may simultaneously contact at least two battery cells 20 of the same battery pack 201. In some embodiments, the temperature equalization element may contact the end wall 23 of at least two battery cells 20 of the same battery pack 201, or may contact the second side wall 22 of at least two battery cells 20 of the same battery pack 201, or simultaneously contact the end wall 23 and the second side wall 22 of at least two battery cells 20 of the same battery pack 201. Figure 12 As shown, there are three battery groups 201, each including five battery cells 20. There are also five temperature equalization elements 100. Three temperature equalization elements 100 correspond to the end walls 23 of the three battery groups 201, meaning each temperature equalization element 100 contacts the end walls 23 of at least two battery cells 20 within the same battery group 201. Two temperature equalization elements 100 correspond to the second side walls 22 of the two edge battery groups 201, meaning both temperature equalization elements 100 contact the second side walls 22 of at least two battery cells 20 within the two edge battery groups 201. Therefore, the temperature equalization elements 100 contacting the end walls 23 or second side walls 22 of at least two battery cells 20 within the same battery group 201 simplifies the structural design of the battery device 2. Simultaneously, it enables temperature equalization of multiple battery cells 20, reducing the temperature difference between multiple battery cells 20 and improving the overall performance of the battery device 2.

[0118] See Figure 14 , Figure 14 This is a second structural schematic diagram of the arrangement of battery cells and temperature-sensing components according to one or more embodiments.

[0119] There are multiple battery groups 201, and the temperature equalization element 100 is located between two adjacent battery groups 201. The temperature equalization element 100 simultaneously contacts the second sidewall 22 of at least two battery cells 20 in two adjacent battery groups 201. Figure 14As shown, there are three battery groups 201, each including five battery cells 20, and two temperature equalization elements 100. One temperature equalization element 100 is sandwiched between the second sidewalls 22 of every two adjacent battery groups 201. In some other embodiments, multiple temperature equalization elements 100 are sandwiched between the second sidewalls 22 of every two adjacent battery groups 201. These multiple temperature equalization elements 100 can be arranged sequentially adjacent to each other or spaced apart along the direction of the battery cells 20. In some other embodiments, the temperature equalization element 100 can also simultaneously contact the end wall 23 of the same battery group 201 and the second sidewall 22 of the side battery group 201. Thus, the temperature equalization element 100 simultaneously contacts the second sidewalls 22 of at least two battery cells 20 in two adjacent battery groups 201, enabling the temperature equalization element 100 to act on a larger number of battery cells 20 simultaneously, further simplifying the structural design of the battery device 2, reducing the temperature difference between multiple battery cells 20, and improving the overall performance of the battery device 2.

[0120] See Figure 15 , Figure 15 This is a third structural schematic diagram of the arrangement of battery cells and temperature-sensing components according to one or more embodiments.

[0121] Each battery cell 20 includes two first sidewalls 21, two second sidewalls 22, and two endwalls 23 arranged opposite to each other. The area of ​​the first sidewalls 21 is larger than the area of ​​the second sidewalls 22 and the area of ​​the endwalls 23. Multiple battery cells 20 of the battery group 201 are arranged sequentially along a direction perpendicular to the second sidewalls 22. The temperature equalization element 100 contacts the first sidewalls 21 of at least two battery cells 20 in the same battery group 201. The battery cell 20 may include, but is not limited to, cylindrical cells, pouch cells, blade cells, or prismatic cells, etc. The two first sidewalls 21 may be arranged opposite to each other in a first direction X or a second direction Y. The first sidewall 21 is the larger surface side of the battery cell 20. Figure 15 As shown, there are five battery groups 201, each battery group 201 including three battery cells 20, which are arranged sequentially along a direction perpendicular to the second sidewall 22. Different battery groups 201 are arranged sequentially along a direction perpendicular to the first sidewall 21. There can be one or more temperature equalization elements 100; for example, one or more temperature equalization elements 100 can correspond to the same battery group 201, and each temperature equalization element 100 can simultaneously contact at least two battery cells 20 of the same battery group 201. Figure 15As shown, there are two temperature equalization elements 100, which contact the first sidewalls 21 of at least two battery cells 20 of the two battery groups 201 at their edges. In some other embodiments, the temperature equalization elements 100 may also contact the first sidewalls 21 of at least two battery cells 20 of two adjacent battery groups 201 simultaneously. Thus, the multiple battery cells 20 of the battery group 201 are arranged sequentially along a direction perpendicular to the second sidewall 22. The regular arrangement of the multiple battery cells 20 increases the energy density of the battery device 2, while also simplifying the arrangement of the temperature equalization elements 100 and improving the overall performance of the battery device 2.

[0122] See Figure 16 , Figure 16 This is a schematic diagram of the second structure of a battery cell according to one or more embodiments.

[0123] The battery cell 20 includes a positive terminal 24 and a negative terminal 25 spaced apart from each other, with the positive terminal 24 and negative terminal 25 located on one side of one end wall 23. The positive terminal 24 and negative terminal 25 can work together to output or input electrical energy into the battery cell 20. For example, in this embodiment, the battery cell 20 may include, but is not limited to, a pouch cell or a prismatic cell. The positive terminal 24 and negative terminal 25 of the battery cell 20 being located on the same side of one end wall 23 facilitates the electrical connection of the battery cell 20 to other components through the positive terminal 24 and negative terminal 25, and reduces interference between the temperature equalization element 100 and the positive terminal 24 and negative terminal 25 of the battery cell 20.

[0124] Furthermore, the temperature equalizer 100 also contacts at least one of the positive terminal 24 and the negative terminal 25. The external contour shape of the temperature equalizer 100 can be set according to actual conditions. The temperature equalizer 100 can simultaneously contact the end wall 23 of at least two battery cells 20 in the same battery pack 201 and at least one of the positive terminal 24 and the negative terminal 25, or the temperature equalizer 100 can simultaneously contact the first side wall 21 of at least two battery cells 20 in the same battery pack 201 and at least one of the positive terminal 24 and the negative terminal 25, or the temperature equalizer 100 can simultaneously contact the second side wall 22 of at least two battery cells 20 in the same battery pack 201 and at least one of the positive terminal 24 and the negative terminal 25. Thus, the temperature difference between at least one of the positive terminal 24 and the negative terminal 25 and other parts of the battery cell 20 can be reduced by the temperature equalizer 100.

[0125] See Figure 17 , Figure 17 This is a third structural schematic diagram of a battery cell according to one or more embodiments.

[0126] The battery cell 20 includes a positive terminal 24 and a negative terminal 25. The positive terminal 24 is located on one side of one end wall 23, and the negative terminal 25 is located on the other side of the end wall 23. In this embodiment, the battery cell 20 may include, but is not limited to, blade cells. The fact that the positive terminal 24 is located on one side of one end wall 23 and the negative terminal 25 is located on the other side of the end wall 23 reduces the risk of interference between the positive terminal 24 and the negative terminal 25 when the battery cell 20 is electrically connected to other components.

[0127] Furthermore, the temperature equalization element also contacts the positive and negative terminals. The external contour shape of the temperature equalization element 100 can be set according to actual conditions. The temperature equalization element 100 can simultaneously contact the end wall 23, positive terminal 24, and negative terminal 25 of at least two battery cells 20 in the same battery pack 201, or the temperature equalization element 100 can simultaneously contact the first side wall 21, positive terminal 24, and negative terminal 25 of at least two battery cells 20 in the same battery pack 201, or the temperature equalization element 100 can simultaneously contact the second side wall 22, positive terminal 24, and negative terminal 25 of at least two battery cells 20 in the same battery pack 201. Thus, the temperature difference between the positive terminal 24 and negative terminal 25 and other parts of the battery cell 20 can be reduced by the temperature equalization element 100.

[0128] See Figure 18 , Figure 18 This is a fourth structural schematic diagram showing the arrangement of battery cells and temperature-sensing components according to one or more embodiments.

[0129] The battery cell 20 is cylindrical, and at least two battery cells 20 in the same group of battery packs 201 are arranged sequentially along the radial direction of the battery cell 20. The heat equalization element 100 contacts the end wall 23 of the at least two battery cells 20 in the same group of battery packs 201. In this embodiment, the battery cell 20 can be a cylindrical cell, and at least two battery cells 20 in the same group of battery packs 201 are arranged sequentially along the radial direction of the battery cell 20. The positive terminal 24 and the negative terminal 25 of the battery cell 20 can be located on one side of the end wall 23 of the battery cell 20. The heat equalization element 100 is located on the other side of the battery cell 20 in the same group of battery packs 201 away from the electrode terminal and contacts the end wall 23 of the at least two battery cells 20 in the same group of battery packs 201 on the other side. Thus, the battery cell 20 is columnar, and the temperature equalization element 100 contacts the end walls 23 of at least two battery cells 20 in the same battery group 201, which simplifies the structural design of the battery device 2. At the same time, it can also perform temperature equalization treatment on multiple battery cells 20, reduce the temperature difference between multiple battery cells 20, and improve the overall performance of the battery device 2.

[0130] See Figure 19 , Figure 19 This is a fifth structural schematic diagram showing the arrangement of battery cells and temperature-sensing components according to one or more embodiments.

[0131] There are multiple battery groups 201, and the temperature equalization element 100 is located between two adjacent battery groups 201. The temperature equalization element 100 simultaneously contacts the sidewalls of the battery cells 20 in the two adjacent battery groups 201. Figure 19 As shown, there are three battery groups 201, each battery group 201 including four battery cells 20. These four battery cells 20 are arranged sequentially along the sidewall of each battery cell 20. The number of temperature equalization elements 100 can be one or more; for example, the same battery group 201 can correspond to one or more temperature equalization elements 100. Each temperature equalization element 100 can simultaneously contact at least two battery cells 20 of the same battery group 201. Figure 19 As shown, there are two temperature equalization elements 100, each of which simultaneously contacts the sidewalls of at least two battery cells 20 of two adjacent battery groups 201. In some other embodiments, temperature equalization elements 100 may be located at other positions, for example, the temperature equalization element 100 may contact the sidewalls of at least two battery cells 20 of two adjacent battery groups 201 at their edges. Thus, by having the temperature equalization element 100 simultaneously contact the sidewalls of the battery cells 20 of two adjacent battery groups 201, it is possible to act on a larger number of battery cells 20 at the same time, further simplifying the structural design of the battery device 2, reducing the temperature difference between multiple battery cells 20, and improving the overall performance of the battery device 2.

[0132] It should be noted that the positive terminal 24 can be interpreted as the positive electrode of the battery cell 20, and the negative terminal 25 can be understood as the negative electrode of the battery cell 20. Alternatively, in some embodiments, the positive terminal 24 can be interpreted as the positive electrode and a conductive structure electrically connected to the positive electrode, and the negative terminal 25 can be interpreted as the negative electrode and a conductive structure electrically connected to the negative electrode. The conductive structure may include, but is not limited to, the protruding structure of the battery cell 20 casing.

[0133] In summary, the temperature equalization element 100 is in contact with at least two battery cells 20, facilitating heat transfer between the temperature equalization element 100 and the battery cells 20. The temperature equalization element 100 forms a phase change channel 110, with the liquid absorber 200 housed in a portion of the phase change channel 110. The remaining portion of the phase change channel 110 serves as a redundant space 111. The liquid absorber 200 is used to wet the liquid phase change working medium 210, and the redundant space 111 is used to fill the gaseous phase change working medium 210. This allows the liquid phase change working medium 210 to spread throughout the phase change channel 110 due to the action of the liquid absorber 200 and to vaporize under the action of the higher-temperature battery cells 20. Simultaneously, the gaseous phase change working medium 210 spontaneously spreads throughout the redundant space 111 and liquefies under the action of the lower-temperature battery cells 20. Ultimately, the temperature equalization of multiple battery cells 20 is achieved through the state change of the phase change working medium 210, reducing the temperature difference between multiple battery cells 20 and improving the overall performance of the battery device 2.

[0134] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, The battery device includes: Multiple battery cells; A temperature equalization assembly includes a temperature equalization element, a liquid absorbent core, and a phase change working fluid. The temperature equalization element is in contact with at least two of the battery cells. The temperature equalization element forms a phase change channel. The liquid absorbent core is accommodated in at least a portion of the phase change channel. The phase change working fluid is located within the phase change channel. The phase change working fluid can switch between liquid and gaseous states under the influence of the temperature of the battery cells. The liquid absorbent core is used to wet the liquid phase change working fluid.

2. The battery device according to claim 1, characterized in that, The portion of the phase change channel that is not filled by the liquid absorber serves as a redundant space. Both the liquid absorber and the redundant space extend along a first direction. At least two of the battery cells are arranged in the first direction and simultaneously contact the temperature equalization element.

3. The battery device according to claim 2, characterized in that, The temperature equalization element has microgrooves on the bottom wall of the phase change channel, the liquid absorption core covers the microgrooves, and the microgrooves extend along the first direction.

4. The battery device according to claim 2 or 3, characterized in that, The redundant space is located on both sides of the absorbent core in a second direction perpendicular to the first direction.

5. The battery device according to claim 4, characterized in that, The temperature equalization assembly also includes a bundle-shaped strip, which is sandwiched between the liquid absorption core and the top wall of the temperature equalization component.

6. The battery device according to claim 2 or 3, characterized in that, The suction core is located on both sides of the redundant space at least in a second direction perpendicular to the first direction.

7. The battery device according to claim 6, characterized in that, The liquid suction core is fitted to the inner wall of the phase change channel, and the liquid suction core is arranged around the redundant space.

8. The battery device according to any one of claims 1 to 7, characterized in that, The liquid-absorbing core has a porous structure.

9. The battery device according to claim 8, characterized in that, The porosity of the absorbent core is between 40% and 80%, and / or the permeability of the absorbent core is greater than or equal to 10% Darcy.

10. The battery device according to any one of claims 1 to 9, characterized in that, The portion of the temperature equalization element that contacts a battery cell at a first temperature is designated as the first portion, and the portion of the temperature equalization element that contacts a battery cell at a second temperature is designated as the second portion. The first temperature is greater than the second temperature. The liquid phase change working fluid located in the first portion vaporizes under the action of the first temperature to form a gaseous phase change working fluid. The gaseous phase change working fluid enters the second portion within the phase change channel. The gaseous phase change working fluid located in the second portion liquefies under the action of the second temperature to form a liquid phase change working fluid. The liquid phase change working fluid wets the liquid-absorbing core to the first portion.

11. The battery device according to claim 10, characterized in that, The area of ​​the absorbent core corresponding to the first part is larger than the area of ​​the absorbent core corresponding to the second part; And / or the thickness of the absorbent core corresponding to the first part is greater than the thickness of the absorbent core corresponding to the second part; And / or the porosity of the portion of the absorbent core corresponding to the first portion is greater than the porosity of the portion of the absorbent core corresponding to the second portion.

12. The battery device according to any one of claims 1 to 11, characterized in that, The battery device further includes a heat exchanger, which has a heat exchange channel for supplying heat exchange fluid. Multiple battery cells are in contact with the heat exchanger.

13. The battery device according to claim 12, characterized in that, The heat exchanger and the temperature equalization element are integrally formed, and the heat exchange channel and the phase change channel are spaced apart from each other.

14. The battery device according to claim 12, characterized in that, The heat exchanger and the temperature equalization element are separately configured, and the heat exchanger and the temperature equalization element are connected.

15. The battery device according to any one of claims 12 to 14, characterized in that, The battery device includes a housing assembly with a receiving groove, a plurality of battery cells are disposed in the receiving groove, and a heat exchanger covers the opening of the receiving groove and is connected to the housing assembly.

16. The battery device according to any one of claims 12 to 15, characterized in that, The heat exchange channel includes multiple branch channels, and the number of phase change channels is multiple. Each phase change channel is provided with the liquid suction core and the phase change working fluid. There is at least one phase change channel between two branch channels.

17. The battery device according to claim 16, characterized in that, The plurality of branch channels and the phase change channel are collectively divided into at least one cooling region. In the same cooling region, each branch channel extends along a first direction, and the plurality of branch channels are spaced apart in a second direction perpendicular to the first direction. The phase change channel extends along the first direction, and at least one phase change channel is present between two branch channels that are at least partially spaced apart in the second direction.

18. The battery device according to claim 17, characterized in that, The number of cooling zones is multiple, and the multiple cooling zones are spaced apart in the first direction.

19. The battery device according to claim 17 or 18, characterized in that, The heat exchanger is provided with a fluid inlet and a fluid outlet, the fluid inlet and the fluid outlet are respectively connected to the heat exchange channel, and the fluid inlet and the fluid outlet are located on one side of the cooling area in the second direction.

20. The battery device according to any one of claims 17 to 19, characterized in that, The battery cell includes two first sidewalls arranged opposite each other in the first direction and two second sidewalls arranged opposite each other in the second direction, wherein the area of ​​the first sidewalls is larger than the area of ​​the second sidewalls.

21. The battery device according to claim 20, characterized in that, Multiple battery cells are divided into at least one column, and the battery cells in the same column are arranged sequentially along the first direction. In the multiple battery cells in the same column, a heat insulation element is sandwiched between the first sidewalls of two adjacent battery cells.

22. The battery device according to claim 21, characterized in that, The battery cells are divided into multiple columns, and the battery cells in different columns are arranged sequentially along the second direction, with the second sidewalls of the battery cells in adjacent columns being attached together.

23. The battery device according to any one of claims 1 to 19, characterized in that, The multiple battery cells are divided into at least one battery group, and at least two battery cells in the same battery group are arranged sequentially, and the temperature equalization element simultaneously contacts at least two battery cells in the same battery group.

24. The battery device according to claim 23, characterized in that, The battery cell is columnar, and at least two battery cells in the same group are arranged sequentially along the radial direction of the battery cell, and the temperature equalization element contacts the end walls of at least two battery cells in the same group.

25. The battery device according to claim 24, characterized in that, The number of battery groups is multiple, and the temperature equalization element is located between two adjacent battery groups. The temperature equalization element simultaneously contacts the sidewalls of the individual battery cells in the two adjacent battery groups.

26. The battery device according to claim 23, characterized in that, The battery cell includes two first sidewalls, two second sidewalls, and two endwalls arranged opposite to each other. The area of ​​the first sidewalls is greater than the area of ​​the second sidewalls and the area of ​​the endwalls. The battery cells of the battery group are arranged sequentially along a direction perpendicular to the first sidewalls.

27. The battery device according to claim 26, characterized in that, The temperature equalization element contacts the end wall or the second side wall of at least two of the battery cells in the same battery group.

28. The battery device according to claim 26, characterized in that, The number of battery groups is multiple, and the temperature equalization element is located between two adjacent battery groups. The temperature equalization element simultaneously contacts the second sidewall of at least two battery cells in two adjacent battery groups.

29. The battery device according to claim 23, characterized in that, The battery cell includes two first sidewalls, two second sidewalls, and two endwalls arranged opposite to each other. The area of ​​the first sidewall is greater than the area of ​​the second sidewall and the area of ​​the endwall. The battery cells of the battery group are arranged sequentially along a direction perpendicular to the second sidewall. The temperature equalization element contacts the first sidewalls of at least two battery cells of the same battery group.

30. The battery device according to any one of claims 26 to 29, characterized in that, The battery cell includes a positive terminal and a negative terminal spaced apart from each other, with the positive terminal and the negative terminal located on one side of one of the end walls.

31. The battery device according to claim 30, characterized in that, The temperature equalizer also contacts at least one of the positive and negative terminals.

32. The battery device according to any one of claims 26 to 29, characterized in that, The battery cell includes a positive terminal and a negative terminal, with the positive terminal located on one side of one end wall and the negative terminal located on the other side of the end wall.

33. The battery device according to claim 32, characterized in that, The temperature equalization element also contacts the positive terminal and the negative terminal.

34. An electrical appliance, characterized in that, The electrical device includes a battery device as described in any one of claims 1 to 33.

Images