Battery device, energy storage device and power utilization device

Abstract

The utility model relates to the technical field of batteries, and discloses a battery device, an energy storage device and a power utilization device.The battery device comprises a battery assembly, a heat exchange part and a temperature equalization part, the heat exchange part is used for exchanging heat with the battery assembly and provided with a first shell, and the temperature equalization part comprises a second shell, a gas-liquid two-phase phase change working medium and a liquid absorption core; the second shell is filled with the phase change working medium and the liquid absorption core, the second shell is fixedly connected to the battery assembly and / or the first shell, a mounting groove is formed in the outer surface of the first shell, and at least part of the second shell is contained in the mounting groove. The temperature equalizing piece and the heat exchange piece can be mutually independent while temperature equalizing treatment is performed on the battery device, on one hand, the temperature equalizing piece can be independently processed and formed, the processing difficulty of the temperature equalizing piece is reduced, and on the other hand, the universality of the temperature equalizing piece can be improved, so that one temperature equalizing piece can be suitable for multiple types of heat exchange pieces; on the other hand, the maintenance difficulty of the uniform-temperature piece can be reduced.

Description

Technical Field

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

[0002] With the development of technology, the application range of battery devices is becoming more and more extensive.

[0003] A battery device typically consists of multiple battery cells. Because these battery cells are positioned differently within the device, the temperature difference between them can be significant during charging and discharging. This results in poor overall temperature uniformity and reduced overall performance of the battery device. Utility Model Content

[0004] This application provides a battery device, an energy storage device, and an electrical device. The battery device not only has good overall temperature uniformity, but also has the advantages of low processing difficulty and convenient maintenance, thus solving the technical problem that the poor overall temperature uniformity of existing battery devices leads to poor overall performance of the battery device.

[0005] In a first aspect, embodiments of this application provide a battery device, comprising: a battery assembly; a heat exchanger for heat exchange with the battery assembly, the heat exchanger having a first outer shell; and a temperature equalization element comprising a second outer shell, a phase change working fluid capable of gas-liquid two-phase operation, and a liquid absorbent core, wherein the phase change working fluid and the liquid absorbent core are both filled into the second outer shell, the second outer shell is fixedly connected to the battery assembly and / or the first outer shell, and a mounting groove is provided on the outer surface of the first outer shell, at least a portion of the second outer shell being received within the mounting groove.

[0006] In the above technical solution, by setting a temperature equalization element, the battery module can be temperature-equalized to improve the overall temperature uniformity of the battery module. Simultaneously, by fixing the second outer shell of the temperature equalization element to the battery module and / or the first outer shell, the temperature equalization element is supported by the battery module and / or heat exchanger, improving its positional stability. This also decouples the temperature equalization element from the heat exchanger, allowing them to operate independently. This enables the temperature equalization element to be manufactured separately, reducing its processing difficulty, and also improves its versatility, making a single temperature equalization element more versatile. The heat exchanger can be applied to various heat exchange components, and on the other hand, it can reduce the maintenance difficulty of the heat exchanger, thereby improving the overall performance of the battery device. The mounting slot can reduce the difficulty of fixing the second shell, and at the same time, it helps to prevent the heat exchanger from protruding from the heat exchanger. When the heat exchanger is placed between the heat exchanger and the battery module, it can prevent the heat exchanger from obstructing the heat exchange between the heat exchanger and the battery module, thereby improving the heat exchange effect of the heat exchanger on the battery module. When the heat exchanger is placed on the side of the heat exchanger away from the battery module, it can prevent the heat exchanger from obstructing the fixing of the heat exchanger, which facilitates the improvement of the positional stability of the heat exchanger and further improves the overall performance of the battery device.

[0007] In some embodiments, a heat exchange channel is formed within the first housing, the heat exchange channel is adapted to be filled with a heat exchange medium adapted to exchange heat with the battery assembly, and the mounting slot is spaced apart from at least a portion of the heat exchange channel.

[0008] In the above technical solution, the temperature equalization element can be arranged adjacent to at least part of the heat exchange channel to avoid the temperature equalization element encroaching on the design area of ​​the heat exchange channel, and to minimize the impact of the temperature equalization element on the heat exchange element, so as to improve the heat exchange performance of the heat exchange element.

[0009] In some embodiments, the heat exchange channel includes multiple channel segments arranged at intervals, and the mounting groove is disposed between two adjacent channel segments.

[0010] In the above technical solution, the mounting groove is arranged adjacent to at least part of the heat exchange channel, thereby realizing the adjacent arrangement of the heat exchanger and at least part of the heat exchange channel and improving the heat exchange performance of the heat exchanger.

[0011] In some embodiments, the first housing has a first side plate and a second side plate disposed opposite to each other, the first side plate being disposed toward the battery assembly, and the mounting groove being formed on the first side plate and / or the second side plate.

[0012] In the above technical solution, a mounting groove is formed on the outer surface of the first housing, and the molding difficulty of the mounting groove is reduced, thereby reducing the difficulty of fixing the temperature equalization component.

[0013] In some embodiments, a portion of the first side panel is recessed toward the direction of the second side panel to form the mounting groove on the side of the first side panel facing the battery assembly.

[0014] In the above technical solution, an installation groove is formed on the side of the heat exchanger facing the battery module, so that the heat exchanger can be installed on the side of the heat exchanger facing the battery module, which facilitates the contact and cooperation between the heat exchanger and the battery module and improves the temperature uniformity effect of the heat exchanger on the battery module.

[0015] In some embodiments, a mating groove is formed on the side of the second side plate facing the first side plate, and the mounting groove is disposed in the mating groove.

[0016] In the above technical solution, the second side plate can avoid the mounting groove on the first side plate, thereby reducing the molding difficulty of the mounting groove and the assembly difficulty of the second side plate and the first side plate.

[0017] In some embodiments, the width of the mating groove is greater than the width of the mounting groove, and the heat exchange channel is formed between the wall of the mating groove and the wall of the mounting groove.

[0018] In the above technical solution, on the one hand, the molding difficulty of the heat exchange channel can be reduced, and on the other hand, the mounting groove and at least part of the heat exchange channel can be arranged adjacent to each other.

[0019] In some embodiments, a portion of the second side plate is recessed in a direction away from the first side plate to form the mating groove.

[0020] The above technical solution can reduce the molding difficulty of the mating groove on the second side plate.

[0021] In some embodiments, a portion of the second side plate is recessed toward a direction away from the first side plate to form the mounting groove on the side of the second side plate opposite to the first side plate and to form the heat exchange channel between the second side plate and the first side plate.

[0022] In the above technical solution, on the one hand, an installation groove can be formed on the side of the heat exchanger away from the battery assembly, so that the heat exchanger can be installed on the side of the heat exchanger away from the battery assembly, reducing the difficulty of fixing the heat exchanger; on the other hand, the installation groove and at least part of the heat exchange flow channel can be arranged adjacent to each other.

[0023] In some embodiments, the battery assembly includes a plurality of battery cells arranged along a first direction, and the heat spreader extends along the first direction.

[0024] In the above technical solution, the extension direction of the temperature equalizer is consistent with the arrangement direction of multiple battery cells. In this way, the temperature equalizer can be used to adjust the temperature difference between multiple battery cells, thereby improving the overall temperature uniformity of the battery module.

[0025] In some embodiments, at least two temperature equalization elements are provided in the first direction at intervals.

[0026] In the above technical solution, at least two temperature equalization elements can be used to perform temperature equalization treatment on multiple battery cells arranged in the first direction, so as to improve the temperature equalization effect of the temperature equalization elements on multiple battery cells.

[0027] In some embodiments, the battery assembly includes multiple battery packs arranged along a second direction, each battery pack including multiple battery cells, the second direction intersecting the first direction; the heat spreader includes multiple heat spreaders arranged along the second direction, such that each battery pack corresponds to at least one heat spreader.

[0028] In the above technical solution, each battery pack can be temperature-uniformed through a temperature-equalizing element, thereby improving the overall temperature uniformity of the battery components.

[0029] In some embodiments, the second outer shell is an aluminum shell; and / or, the liquid-absorbing core is made of aluminum.

[0030] In the above technical solution, while reducing the manufacturing cost and weight of the heat exchanger, the second outer shell and the heat absorption core of the heat exchanger can be made of the same material, which reduces the assembly difficulty of the heat exchanger and improves the heat exchange effect of the heat exchanger.

[0031] In some embodiments, the battery assembly further includes a housing and battery cells, the housing defining a mounting cavity, the battery cells being disposed within the mounting cavity, the heat exchanger being disposed on the outside of the housing and opposite to the battery cells; the temperature equalization element being disposed between the heat exchanger and the housing; or, the temperature equalization element being disposed on the side of the heat exchanger away from the housing.

[0032] The above technical solution can achieve temperature equalization of battery modules and improve the overall temperature uniformity of battery modules.

[0033] In some embodiments, the phase change working fluid satisfies at least one of the following conditions: the supercritical temperature of the phase change working fluid ranges from 200℃ to 270℃; the triple point temperature of the phase change working fluid ranges from -110℃ to 80℃; the supercritical pressure of the phase change working fluid ranges from 4MPa to 5.5MPa; the surface tension of the phase change working fluid ranges from 0.015N / m to 0.035N / m; the liquid density of the phase change working fluid ranges from 700kg / m³ to 900kg / m³; the latent heat enthalpy difference of the phase change working fluid ranges from 280KJ / KG to 350KJ / KG; and the viscosity of the phase change working fluid ranges from 2*10... -4 Pa·s ~4*10 -4 Pa·s.

[0034] The above technical solution can improve the performance of the phase change working fluid, thereby improving the temperature uniformity of the temperature homogenizer.

[0035] Secondly, embodiments of this application provide an energy storage device, including: the aforementioned battery device, the battery device being used to store or provide electrical energy.

[0036] In the above technical solution, the overall performance of the energy storage device can be improved by adopting the aforementioned battery device.

[0037] Thirdly, embodiments of this application provide an electrical device, including: the aforementioned battery device or the aforementioned energy storage device, wherein the battery device is used to store or provide electrical energy.

[0038] In the above technical solutions, the performance of the electrical device can be improved by using the aforementioned battery device or the aforementioned energy storage device.

[0039] Additional aspects and advantages of this application will become apparent from the description which follows, or may be learned by practice of this application. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of an electrical device according to some embodiments of this application;

[0042] Figure 2 This is a schematic diagram of an energy storage device according to some embodiments of this application;

[0043] Figure 3 Exploded views of a battery device according to some embodiments of this application;

[0044] Figure 4 This is a top view of the heat exchanger and the temperature equalization element when they are assembled according to some embodiments of this application;

[0045] Figure 5 for Figure 4 A sectional view along line AA.

[0046] Figure 6 for Figure 5 A magnified view of region I in the middle;

[0047] Figure 7 This is an exploded view of a battery device according to other embodiments of this application;

[0048] Figure 8 This is a bottom view of the heat exchanger and the temperature equalization element when they are assembled according to other embodiments of this application;

[0049] Figure 9 for Figure 8 Sectional view along line BB;

[0050] Figure 10 for Figure 9 Enlarged view of region II.

[0051] Figure label:

[0052] 2000, Electrical appliances;

[0053] 1000, Battery device;

[0054] 100. Battery assembly; 110. Battery pack; 111. Individual battery cell;

[0055] 200. Heat exchanger components;

[0056] 210. First outer shell;

[0057] 211. Mounting slot;

[0058] 212. Heat exchange channel; 2121. Channel section;

[0059] 213. First side panel;

[0060] 214. Second side plate; 2141. Mating groove;

[0061] 300. Temperature equalization element; 310. Second outer shell; 330. Liquid suction core;

[0062] 400. Enclosure; 410. Mounting cavity; 440. Upper enclosure; 450. Lower enclosure;

[0063] 1100. Energy storage device; 1110. Energy storage box;

[0064] 1200, Controller;

[0065] 1300, Motor. Detailed Implementation

[0066] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0067] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0068] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a 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.

[0069] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0070] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0071] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0072] In this application, "multiple" means two or more, including two.

[0073] Currently, judging from market trends, the application of battery cells is becoming increasingly widespread. Battery cells are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace, among other fields.

[0074] As the application fields of battery cells continue to expand, the market demand for them is also constantly increasing.

[0075] The battery cell mentioned here can be a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and this application embodiment is not limited to this. Similarly, the battery cell can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to this either. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this application embodiment is not limited to this either.

[0076] For example, a battery cell typically includes a casing, an electrode assembly, and an electrolyte. The casing houses the electrode assembly and the electrolyte, and has at least one positive electrode post and at least one negative electrode post. The electrode assembly includes one or more electrodes, which are formed by stacking or winding a positive electrode sheet, a negative electrode sheet, and a separator.

[0077] The positive electrode typically includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector, and multiple positive electrode tabs are stacked together and electrically connected to the positive electrode post. For example, the stacked positive electrode tabs can be directly welded to the positive electrode post to form an electrical connection; alternatively, the battery cell may also include a positive electrode adapter, with the stacked positive electrode tabs welded to one end of the adapter, and the other end of the adapter welded to the positive electrode post, thus forming an electrical connection between the positive electrode tabs and the positive electrode post.

[0078] The negative electrode generally includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector, and multiple negative electrode tabs are stacked together and electrically connected to the negative electrode post. For example, the stacked negative electrode tabs can be directly welded to the negative electrode post to form an electrical connection; alternatively, the battery cell may also include a negative electrode adapter piece, with the stacked negative electrode tabs welded to one end of the adapter piece, and the other end of the adapter piece welded to the negative electrode post, so that the negative electrode tabs and the negative electrode post form an electrical connection.

[0079] The material of the separator is not limited; for example, it can be polypropylene or polyethylene.

[0080] Among them, such as Figure 3 As shown, battery device 1000 refers to a single physical module comprising multiple battery cells 111 to provide higher voltage and capacity. For example, battery device 1000 mentioned in this application may include battery assembly 100, which includes one or more battery packs 110 for providing voltage and capacity. Battery pack 110 may include multiple battery cells 111, which are connected in series, parallel, or mixed connections via busbars.

[0081] In some embodiments, such as Figure 3 As shown, the battery pack 110 is typically formed by arranging multiple battery cells 111. As an example, the battery pack 110 can be a battery module, which is formed by arranging and fixing multiple battery cells 111 into a single module. As an example, a battery module can be formed by bundling multiple battery cells 111 together with cable ties.

[0082] In some embodiments, such as Figure 3 As shown, the battery device 1000 can be a battery pack. The battery device 1000 generally includes a housing 400, which is used to encapsulate the battery cells 111 of the battery assembly 100. This can, to a certain extent, prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells 111. Of course, in some other embodiments, the battery device 1000 may not include the housing 400.

[0083] In some embodiments, such as Figure 3 As shown, the housing 400 defines the mounting cavity 410, and the battery cell 111 is disposed inside the housing 400, so as to realize the support and protection of the battery cell 111 by the housing 400. While improving the structural stability of the battery cell 111, it can also extend the service life of the battery cell 111 and improve the safety of the battery cell 111 in use.

[0084] The housing 400 can adopt various structures.

[0085] In some embodiments, such as Figure 3 and Figure 7 As shown, the housing 400 may include an upper housing 440 and a lower housing 450. The upper housing 440 and the lower housing 450 cover each other in the vertical direction. The upper housing 440 and the lower housing 450 together define a mounting cavity 410 for accommodating the battery cell 111, thereby reducing the molding difficulty of the housing 400 and making it easier to place the battery cell 111 inside the housing 400.

[0086] It should be noted that the above-mentioned up and down directions can be understood as... Figure 3 and Figure 7 The Z direction is shown in the diagram.

[0087] In this design, the upper housing 440 can be a hollow structure open at one end, and the lower housing 450 can be a plate-like structure. The lower housing 450 covers the open side of the upper housing 440 (not shown in the example figure), so that the upper housing 440 and the lower housing 450 together define the mounting cavity 410; or, the lower housing 450 can be a hollow structure open at one end, and the upper housing 440 can be a plate-like structure (not shown in the example figure), with the upper housing 440 covering the open side of the lower housing 450. In this way, the upper housing 440 and the lower housing 450 can also cooperate to define the mounting cavity 410; or, as... Figure 3 As shown, both the upper housing 440 and the lower housing 450 are hollow structures with one side open. The open side of the upper housing 440 covers the open side of the lower housing 450 to define the mounting cavity 410.

[0088] It should be noted that the box 400 formed by the upper box 440 and the lower box 450 can be of various shapes, such as cylinder, cube or cuboid; the battery cell 111 can be of various shapes, such as cylinder or square.

[0089] In summary, the battery assembly 100 includes multiple battery cells 111, which are positioned differently within the battery device 1000. The battery cells 111 located at the periphery of the battery device 1000 are closer to the housing 400, facilitating heat exchange with the outside environment. Furthermore, the temperature of the heat exchange medium gradually decreases during heat exchange within the heat exchanger 200, especially on the direct-cooling plate. The pressure drop caused by the flow of the heat exchange medium affects the evaporation temperature. Simultaneously, under low load, the liquid heat exchange medium is prone to uneven distribution, leading to an overall temperature fluctuation in the battery device 1000. Poor temperature uniformity not only limits the usable capacity and discharge power of the battery device 1000, but also causes inconsistent performance degradation among multiple battery cells 111. Battery cells 111 located in high-temperature areas age faster, resulting in poor internal resistance and capacity uniformity of the battery device 1000. Consequently, the overall lifespan of the battery device 1000 is drastically reduced, and the overall performance of the battery device 1000 is decreased. Current methods mainly focus on improving the overall temperature uniformity of the battery device 1000 by strengthening insulation and optimizing the flow channel design of the heat exchange component 200, but the effect is very limited.

[0090] To solve the above problems, combined with Figures 3-10As shown, this application provides a battery device 1000. The battery device 1000 incorporates a temperature equalization element 300, with its second outer shell 310 fixedly connected to the battery assembly 100 and / or the first outer shell 210. The temperature equalization element 300 functions as a heat distribution center, primarily using a gas-liquid two-phase phase change working fluid to rapidly conduct heat from a high-temperature region (typically the center of the battery device 1000) to a low-temperature region (typically the edge of the battery device 1000). This achieves the purpose of temperature equalization of the battery assembly 100 using the temperature equalization element 300, making the temperature field of the entire battery device 1000 more uniform, improving the overall temperature uniformity of the battery assembly 100, and maximizing the overall performance of the battery device 1000. Furthermore, this application also configures the temperature equalization element 300 to have a second outer shell 310 and the heat exchange element 200 to have a first outer shell 210, so that the temperature equalization element 300 and the heat exchange element... Each of the 200 components has a separate housing, decoupling the temperature-sensing element 300 and the heat exchanger 200. This allows the temperature-sensing element 300 and the heat exchanger 200 to operate independently. On one hand, this allows the temperature-sensing element 300 to be manufactured separately, reducing its processing difficulty. On the other hand, it improves the versatility of the temperature-sensing element 300, making it applicable to multiple heat exchanger elements 200. On the other hand, it reduces the maintenance difficulty of the temperature-sensing element 300, thereby improving the overall performance of the battery device 1000. This overcomes the temperature gradient between the edge and center of the battery cells 111 caused by heat transfer to the external environment during battery device 1000 operation, reduces the temperature difference between battery cells 111, and overcomes the technical problem of uneven temperature distribution of the heat exchanger 200 under certain operating conditions, which leads to uneven temperature of the battery cells 111. This solves the technical problem of poor overall temperature uniformity in existing battery devices, which leads to a reduction in the overall performance of the battery device.

[0091] This application embodiment also provides an energy storage device 1100 including the above-described battery device 1000, such as... Figure 2 As shown, the energy storage device 1100 also includes an energy storage box 1110, which contains a battery device 1000. The battery device 1000 is used to store or provide electrical energy, thereby ensuring the working performance of the energy storage device 1100 to a certain extent.

[0092] The energy storage device 1100 includes one or more battery clusters to increase its voltage and capacity. Each battery cluster may include multiple battery devices 1000, which are connected in series via a busbar to increase the voltage of the energy storage device 1100. When the energy storage device 1100 includes multiple battery clusters, these clusters are connected in parallel to increase the capacity of the energy storage device 1100.

[0093] The energy storage device 1100 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. The energy storage device 1100 can store electrical energy as needed and output it when appropriate. For example, the energy storage device 1100 can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours.

[0094] In some embodiments, the energy storage device 1100 is an energy storage container or an energy storage cabinet.

[0095] In some embodiments, the energy storage device 1100 may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0096] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device 1000 via pipelines for regulating the temperature of the individual battery cells 111.

[0097] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0098] As an example, the central control module can serve as the battery management unit of the energy storage device 1100, used to monitor and manage the energy storage device 1100. The central control module can monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device 1100. For example, it can control the charging and discharging current and voltage of the energy storage device 1100. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0099] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., for detecting, alarming, or extinguishing fires in the energy storage device 1100.

[0100] As an example, the power distribution module can be used to distribute power to the power consumption modules of the energy storage device 1100.

[0101] This application embodiment also provides an electrical device 2000 including the above-described battery device 1000 or energy storage device 1100 (e.g., Figure 1 As shown), the battery device 1000 or energy storage device 1100 is used to store or provide electrical energy so as to provide electrical energy to the power-consuming device 2000 and to a certain extent ensure the working performance of the power-consuming device 2000.

[0102] The electrical device 2000 mentioned here can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc.

[0103] Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys; spacecraft can include airplanes, rockets, space shuttles, and spaceships; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0104] For ease of explanation, the following embodiments use a vehicle as an example to describe the structure of the electrical device 2000 of this application in detail.

[0105] Please refer to Figure 1 , Figure 1 The electrical device 2000 is shown as a vehicle. The vehicle 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. The vehicle is equipped with a battery device 1000, which can be located at the bottom, front, or rear of the vehicle. The battery device 1000 can be used to power the vehicle; for example, the battery device 1000 can serve as the vehicle's operating power source.

[0106] In some embodiments, such as Figure 1 As shown, the vehicle may also include a controller 1200 and a motor 1300. The controller 1200 is used to control the battery device 1000 to supply power to the motor 1300, for example, for the power needs of the vehicle during starting, navigation and driving.

[0107] In some embodiments of this application, the battery device 1000 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0108] The following description, with reference to the accompanying drawings, describes a battery device 1000 according to an embodiment of this application.

[0109] like Figure 3 As shown, the battery device 1000 includes a battery assembly 100, a heat exchanger 200, and a temperature equalization element 300.

[0110] Among them, the heat exchanger 200 is used for heat exchange with the battery assembly 100, combined with Figure 4 , Figure 5 and Figure 6 As shown, the heat exchanger 200 has a first housing 210.

[0111] It should be noted that by setting the heat exchanger 200 to exchange heat with the battery module 100, the temperature of the battery module 100 can be raised or lowered by the heat exchanger 200, ensuring that the battery module 100 is in the optimal temperature window during operation, thereby significantly improving the charging and discharging efficiency, rate performance and effective capacity of the battery module 100, thereby improving the working performance of the battery module 100 and achieving the purpose of utilizing the working performance of the battery device 1000.

[0112] Among them, the battery component 100 is the core of the battery device 1000. The function of the battery component 100 is to store and release electrical energy to improve the working performance of the battery device 1000.

[0113] Combination Figure 3 and Figure 6 As shown, the temperature equalization element 300 includes a second outer shell 310, a phase change working medium (not shown) capable of both gas and liquid phases, and a liquid wick 330. Both the phase change working medium and the liquid wick 330 are filled within the second outer shell 310. The second outer shell 310 is fixedly connected to the battery assembly 100 and / or the first outer shell 210. This means that the second outer shell 310 is fixedly connected to the battery assembly 100; or, the second outer shell 310 is fixedly connected to the first outer shell 210; or, the second outer shell 310 is fixedly connected to both the battery assembly 100 and the first outer shell 210. On the one hand, this allows the temperature equalization element 300 to be supported by the battery assembly 100 and / or the heat exchanger 200, reducing the difficulty of fixing the temperature equalization element 300 and improving its positional stability, thereby improving the working performance of the temperature equalization element 300. On the other hand, because the heat exchanger 200 is used to connect with the battery assembly 100... 00 Heat exchange, by fixing the second housing 310 to the battery assembly 100 and / or the first housing 210, allows the temperature equalization element 300 to always be positioned close to the battery assembly 100. Since the temperature equalization element 300 includes a phase change working medium that can be in both gas and liquid phases and a liquid wick 330, the heat in the hot area of ​​the battery assembly 100 can be quickly conducted to the low temperature area using the temperature equalization element 300, so that the temperature of the entire battery assembly 100 tends to be uniform, thereby achieving the purpose of balancing the temperature of the battery assembly 100 and improving the temperature uniformity of the battery assembly 100.

[0114] It should be noted that the liquid wick 330 can spontaneously transport the liquid phase change working medium by using capillary force, thereby driving the circulation of the phase change working medium. The temperature equalization element 300 can absorb and / or release heat through the phase change of the phase change working medium, thereby improving the temperature equalization effect of the temperature equalization element 300 and thus balancing the temperature of the battery module 100.

[0115] In a specific example, the temperature equalizer 300 has an evaporation end near the center of the battery device 1000 and a condensation end near the edge of the battery device 1000. The heat from the battery cell 111 near the center of the battery device 1000 is conducted to the wick 330 through the second shell 310 of the temperature equalizer 300, causing the liquid phase change working fluid in the wick 330 to evaporate into vapor. This process absorbs a large amount of latent heat of vaporization, thereby efficiently removing the heat from the battery cell 111 near the center of the battery device 1000. At the same time, due to evaporation, the vapor pressure inside the evaporation end is slightly higher than that at the other end. Driven by the pressure difference, the vapor flows at high speed inside the second shell 310 towards the condensation end. At the condensation end, the vapor carrying latent heat encounters a relatively cool temperature... The surface of the lower-temperature second outer shell 310 condenses and releases latent heat, turning back into a liquid phase change working medium. The released heat is carried away by the external cooling system through the second outer shell 310. When the condensed liquid phase change working medium accumulates in the wick 330 at the condensation end, the capillary action of the wick 330 begins to play a key role, sending the liquid phase change working medium from the condensation end back to the evaporation end to replenish the phase change working medium consumed by evaporation, completing a cycle. This achieves rapid and efficient heat transfer from the high-temperature point to the low-temperature point, and makes the surface temperature of the entire temperature equalizer 300 highly uniform, thereby making the temperature of the entire battery assembly 100 tend to be uniform, achieving the purpose of balancing the temperature of the battery assembly 100 and improving the temperature uniformity of the battery assembly 100.

[0116] It should be noted that this application configures the temperature-equalizing element 300 to have a second outer shell 310 and the heat exchanger 200 to have a first outer shell 210, so that both the temperature-equalizing element 300 and the heat exchanger 200 have separate outer shells, thereby decoupling the temperature-equalizing element 300 and the heat exchanger 200. This allows the temperature-equalizing element 300 to be manufactured and formed independently, reducing the manufacturing difficulty of the temperature-equalizing element 300. At the same time, it can also improve the versatility of the temperature-equalizing element 300, so that one temperature-equalizing element 300 can be used for multiple heat exchanger elements 200. On the other hand, when the temperature-equalizing element 300 needs maintenance, the heat exchanger 200 does not need to be maintained, reducing the maintenance difficulty of the temperature-equalizing element 300, thereby improving the overall performance of the battery device 1000.

[0117] Understandably, compared with the prior art, this application not only sets up a temperature equalization element 300 to perform temperature equalization treatment on the battery assembly 100, but also decouples the temperature equalization element 300 and the heat exchange element 200 so that the temperature equalization element 300 and the heat exchange element 200 can be independent of each other, reducing the processing difficulty and maintenance difficulty of the temperature equalization element 300, improving the versatility of the temperature equalization element 300, thereby improving the overall performance of the battery device 1000.

[0118] In some embodiments, the second housing 310 may be fixedly connected to the battery assembly 100 and / or the first housing 210 by means of welding or bonding.

[0119] In some embodiments, the phase change working medium can be a pure substance in both gas and liquid phases (such as acetone, methanol, or ethanol), or a mixture of several pure substances, without any specific limitation.

[0120] In some embodiments, such as Figure 3 As shown, the battery assembly 100 also includes a housing 400 and individual battery cells 111. A heat exchanger 200 is disposed on the outside of the housing 400 and is positioned opposite to the individual battery cells 111. This facilitates heat exchange between the heat exchanger 200 and the battery assembly 100, allowing the battery assembly 100 to operate within a suitable operating temperature range.

[0121] In some embodiments, combined with Figure 3 , Figure 7 and Figure 10 As shown, the temperature equalization element 300 is disposed between the heat exchange element 200 and the housing 400; or, the temperature equalization element 300 is disposed on the side of the heat exchange element 200 away from the housing 400. That is to say, it is not limited to placing the temperature equalization element 300 between the heat exchange element 200 and the housing 400, but can also be disposed on the side of the heat exchange element 200 away from the housing 400. In both of the above arrangements, the temperature equalization element 300 can be used to quickly conduct heat from the hot spot area of ​​the battery cell 111 to the low temperature area, so that the temperature of the battery cell 111 tends to be uniform, thereby balancing the temperature of the battery cell 111, ensuring the temperature uniformity of the battery cell 111, and improving the working performance of the battery cell 111.

[0122] In some examples, such as Figure 3 As shown, the temperature equalization element 300 is located between the heat exchange element 200 and the housing 400. The temperature equalization element 300 is in direct contact with the housing 400. The temperature equalization element 300 can directly and quickly transfer the heat from the hot spot area of ​​the battery cell 111 to the low temperature area through the housing 400. The temperature equalization element 300 works in conjunction with the heat exchange element 200. The heat exchange element 200 exchanges the heat transferred from the battery cell 111 to the housing 400. While avoiding overheating of the battery cell 111, it can also ensure the temperature uniformity of the battery cell 111, thereby improving the working performance of the battery cell 111.

[0123] In other examples, combined Figure 7 , Figure 9 and Figure 10As shown, the temperature equalization element 300 is located on the side of the heat exchange element 200 away from the housing 400. The temperature equalization element 300 indirectly contacts the housing 400. The heat exchange element 200 first exchanges the heat transferred from the battery cell 111 to the housing 400. Then, the temperature equalization element 300 adjusts the temperature of the heat transferred from the housing 400 to the heat exchange element 200. The heat exchange element 200 and the temperature equalization element 300 work together to prevent the battery cell 111 from overheating and to improve the temperature uniformity of the battery cell 111, thereby improving the working performance of the battery cell 111.

[0124] It should be noted that, compared to placing the temperature equalizer 300 between the heat exchanger 200 and the housing 400, placing the temperature equalizer 300 on the side of the heat exchanger 200 away from the housing 400 can reduce the difficulty of setting the temperature equalizer 300.

[0125] In some embodiments, the absorbent core 330 is made of metal, such that the absorbent core 330 is formed as a metal wire with a capillary structure to improve the performance of the absorbent core 330.

[0126] Of course, in some other embodiments, the absorbent core 330 may also be made of titanium fiber.

[0127] Optionally, the second housing 310 is an aluminum housing. That is, the second housing 310 is made of aluminum, which reduces the manufacturing cost of the second housing 310 and also reduces its weight, making it easier to meet the lightweight design requirements of the battery device 1000.

[0128] Optionally, the absorbent core 330 is made of aluminum. That is, the absorbent core 330 is made of aluminum, which reduces the manufacturing cost of the absorbent core 330 and also reduces its weight, further meeting the lightweight design requirements of the battery device 1000.

[0129] In some embodiments, both the second housing 310 and the liquid absorbent core 330 are made of aluminum. This reduces the manufacturing cost and weight of the temperature equalizer 300, and also allows the second housing 310 and the liquid absorbent core 330 to be made of the same material. This significantly reduces the possibility of a chemical reaction between the second housing 310 and the liquid absorbent core 330, and also reduces the difficulty of fixing the second housing 310 and the liquid absorbent core 330 together.

[0130] In some embodiments, the absorbent core 330 may be fixedly connected to the second housing 310 by welding, bonding or other connection processes.

[0131] In other embodiments, the heat exchanger 300 may also be other forms of superconducting heat exchangers, and no specific limitations are made here.

[0132] In some embodiments, combined with Figure 3 , Figure 6 , Figure 7 and Figure 10 As shown, a mounting groove 211 is provided on the outer surface of the first housing 210, and at least a portion of the second housing 310 is accommodated within the mounting groove 211. This allows at least a portion of the second housing 310 to engage with the mounting groove 211, thereby fixing the second housing 310 to the outer surface of the first housing 210. This facilitates the use of the first housing 210 to support the second housing 310, effectively enabling the heat exchanger 200 to support the temperature equalizer 300, improving the positional stability of the temperature equalizer 300, and thus enhancing its performance.

[0133] In addition, by setting the mounting groove 211, on the one hand, the mounting groove 211 can reduce the installation difficulty of at least part of the second housing 310, and on the other hand, the mounting groove 211 can increase the contact area between the second housing 310 and the first housing 210, improve the connection strength between the second housing 310 and the first housing 210, and further improve the positional stability of the temperature equalization element 300.

[0134] Meanwhile, by setting the mounting groove 211, it is also beneficial to prevent the heat exchanger 300 from protruding from the heat exchanger 200. In this way, when the heat exchanger 300 is located on the side of the heat exchanger 200 facing the battery assembly 100, the heat exchanger 300 can avoid obstructing the heat exchange between the heat exchanger 200 and the battery assembly 100, thereby improving the heat exchange effect of the heat exchanger 200 on the battery assembly 100. When the heat exchanger 300 is located on the side of the heat exchanger 200 away from the battery assembly 100, the heat exchanger 300 can avoid obstructing the fixation of the heat exchanger 200, thereby improving the positional stability of the heat exchanger 200 and further improving the overall performance of the battery device 1000.

[0135] Of course, in some other embodiments, the mounting groove 211 may not be provided on the outer surface of the first housing 210 to reduce the molding difficulty of the first housing 210.

[0136] It should be noted that when the mounting groove 211 is not provided on the outer surface of the first housing 210, if the second housing 310 is directly fixed to the outer surface of the first housing 210, the heat exchanger 300 will protrude from the heat exchanger 200. Thus, when the heat exchanger 300 is located on the side of the heat exchanger 200 facing the battery assembly 100, the heat exchanger 300 will cause the heat exchanger 200 to be spaced apart from the battery assembly 100. In this case, to improve the heat exchange effect between the heat exchanger 200 and the battery assembly 100, thermally conductive adhesive can be filled between the battery assembly 100 and the heat exchanger 200. The thermally conductive adhesive can transfer the heat between the battery assembly 100 and the heat exchanger 200. Heat from the battery assembly 100 is transferred to the heat exchanger 200, thereby improving the heat exchange effect of the heat exchanger 200 on the battery assembly 100. When the heat exchanger 300 is located on the side of the heat exchanger 200 away from the battery assembly 100, the heat exchanger 300 will cause the heat exchanger 200 to be spaced apart from the inner peripheral wall of the housing 400. In order to improve the support effect of the housing 400 on the heat exchanger 200, a support block can be set on the side of the heat exchanger 200 away from the battery assembly 100 (such as setting a support block between the heat exchanger 200 and the inner peripheral wall of the housing 400), thereby improving the positional stability of the heat exchanger 200.

[0137] In some embodiments, combined with Figure 6 and Figure 10 As shown, a heat exchange channel 212 is formed within the first outer casing 210. The heat exchange channel 212 is suitable for being filled with a heat exchange medium, which is suitable for heat exchange with the battery assembly 100. The mounting groove 211 is spaced apart from at least a portion of the heat exchange channel 212. In other words, the heat exchanger 200 has a first outer casing 210 and a heat exchange medium. The heat exchange medium is filled within the first outer casing 210. By utilizing the heat exchange medium to exchange heat with the battery assembly 100, heat exchange cooperation between the heat exchanger 200 and the battery assembly 100 is achieved, thereby improving the heat exchange performance of the heat exchanger 200.

[0138] The heat exchange medium mentioned here can be water, refrigerant, etc.

[0139] Meanwhile, by setting the mounting groove 211 at a distance from at least part of the heat exchange channel 212, the heat exchanger 300 can be set at a distance from at least part of the heat exchange channel 212, thus avoiding the heat exchanger 300 from encroaching on the design area of ​​the heat exchange channel 212 and minimizing the impact of the heat exchanger 300 on the heat exchanger 200, thereby improving the heat exchange performance of the heat exchanger 200.

[0140] In some embodiments, combined with Figure 6 , Figure 8 and Figure 10As shown, the heat exchange channel 212 includes multiple channel segments 2121, which are arranged at intervals. An installation groove 211 is located between two adjacent channel segments 2121. This ensures that the installation groove 211 is adjacent to at least a portion of the heat exchange channel 212, thereby achieving an adjacent arrangement between the heat exchanger 300 and at least a portion of the heat exchange channel 212. This prevents the heat exchanger 300 from encroaching on the design area of ​​the heat exchange channel 212 and improves the heat exchange performance of the heat exchanger 200.

[0141] In addition, by configuring the heat exchange channel 212 to include multiple channel segments 2121, it is convenient to place multiple channel segments 2121 at different positions of the first housing 210, thereby facilitating the use of the heat exchange component 200 to exchange heat with the battery cells 111 at different positions, so as to improve the working performance of the battery assembly 100.

[0142] In some embodiments, multiple flow channels 2121 are interconnected to facilitate the flow of the heat exchange medium.

[0143] In some embodiments, combined with Figure 3 , Figure 6 and Figure 10 As shown, the first housing 210 has a first side plate 213 and a second side plate 214 disposed opposite to each other. The first side plate 213 is disposed toward the battery assembly 100, and a mounting groove 211 is formed on the first side plate 213 and / or the second side plate 214. This means that the mounting groove 211 is formed on the first side plate 213; or, the mounting groove 211 is formed on the second side plate 214; or, the first side plate 213 and the second side plate 214 are both formed with mounting grooves 211, so as to realize the mounting groove 211 on the outer surface of the first housing 210 and reduce the molding difficulty of the mounting groove 211, thereby reducing the fixing difficulty of the temperature equalization component 300.

[0144] In a specific example, when mounting grooves 211 are formed on both the first side plate 213 and the second side plate 214, temperature equalization elements 300 can be set on opposite sides of the heat exchanger 200 to improve the temperature equalization effect on the battery assembly 100.

[0145] In some embodiments, combined with Figure 3 , Figure 4 and Figure 6 As shown, a portion of the first side plate 213 is recessed towards the direction of the second side plate 214 to form a mounting groove 211 on the side of the first side plate 213 facing the battery assembly 100. This can also be understood as follows: when it is necessary to form the mounting groove 211 on the first side plate 213, a portion of the first side plate 213 can be configured to be recessed towards the direction of the second side plate 214, thereby achieving the formation of the mounting groove 211 on the side of the heat exchanger 200 facing the battery assembly 100.

[0146] Meanwhile, the above-mentioned arrangement also allows the temperature equalizer 300 to be installed on the side of the heat exchanger 200 facing the battery assembly 100, which facilitates the contact and cooperation between the temperature equalizer 300 and the battery assembly 100 and improves the temperature equalization effect of the temperature equalizer 300 on the battery assembly 100.

[0147] It is worth noting that in this application, a portion of the first side plate 213 is recessed toward the direction close to the second side plate 214 to form a mounting groove 211. Compared with the prior art, which directly cuts off part of the structure on the first side plate 213 to form the mounting groove 211, this reduces the difficulty of forming the mounting groove 211 and also improves the structural strength of the first side plate 213, thereby improving the structural strength of the heat exchanger 200 and improving the working performance of the heat exchanger 200.

[0148] In some embodiments, such as Figure 6 As shown, a mating groove 2141 is formed on the side of the second side plate 214 facing the first side plate 213, and the mounting groove 211 is disposed in the mating groove 2141. The mating groove 2141 can prevent the second side plate 214 from interfering with the mounting groove 211, reduce the molding difficulty of the mounting groove 211, and reduce the assembly difficulty of the second side plate 214 and the first side plate 213.

[0149] In some embodiments, such as Figure 6 As shown, the width of the mating groove 2141 is greater than the width of the mounting groove 211, and a heat exchange channel 212 is formed between the groove wall of the mating groove 2141 and the groove wall of the mounting groove 211. On the one hand, this reduces the molding difficulty of the heat exchange channel 212, and on the other hand, it allows the mounting groove 211 and at least part of the heat exchange channel 212 to be arranged adjacent to each other, thereby preventing the heat exchanger 300 from encroaching on the design area of ​​the heat exchange channel 212, minimizing the impact of the heat exchanger 300 on the heat exchanger 200, and improving the heat exchange performance of the heat exchanger 200.

[0150] In some embodiments, such as Figure 6 As shown, a portion of the second side plate 214 is recessed in a direction away from the first side plate 213 to form a mating groove 2141. This reduces the molding difficulty of the mating groove 2141 on the second side plate 214, thereby reducing the processing difficulty of the mating groove 2141.

[0151] It should be noted that in this application, a portion of the second side plate 214 is recessed in a direction away from the first side plate 213 to form a mating groove 2141. Compared with the prior art, which directly cuts off part of the structure on the second side plate 214 to form the mating groove 2141, this reduces the difficulty of forming the mating groove 2141 and also improves the structural strength of the second side plate 214, further improving the structural strength of the heat exchanger 200 and enhancing the working performance of the heat exchanger 200.

[0152] In some embodiments, combined with Figure 8and Figure 10 As shown, a portion of the second side plate 214 is recessed in a direction away from the first side plate 213, forming a mounting groove 211 on the side of the second side plate 214 away from the first side plate 213 and a heat exchange channel 212 between the second side plate 214 and the first side plate 213. This can also be understood as follows: when it is necessary to form the mounting groove 211 on the second side plate 214, a portion of the second side plate 214 can be set to be recessed in a direction away from the first side plate 213. This not only forms the mounting groove 211 on the side of the second side plate 214 away from the first side plate 213, but also forms the heat exchange channel 212 between the second side plate 214 and the first side plate 213, while reducing the molding difficulty of the mounting groove 211 and the heat exchange channel 212.

[0153] Meanwhile, by forming the mounting groove 211 on the second side plate 214, the mounting groove 211 can be formed on the side of the heat exchanger 200 away from the battery assembly 100, thereby enabling the heat exchanger 300 to be installed on the side of the heat exchanger 200 away from the battery assembly 100, reducing the difficulty of fixing the heat exchanger 300.

[0154] Furthermore, the above molding method allows the mounting groove 211 and at least a portion of the heat exchange channel 212 to be arranged adjacent to each other.

[0155] In some embodiments, such as Figure 3 and Figure 7 As shown, the battery assembly 100 includes a plurality of battery cells 111, which are arranged along a first direction, and the heat spreader 300 extends along the first direction. It should be noted that the first direction referred to here can be understood as... Figure 3 As shown in the Y direction, by setting multiple battery cells 111, the capacity and voltage of the battery device 1000 can be significantly improved, so that the battery device 1000 can provide power to the electrical device 2000, enabling the electrical device 2000 to operate normally.

[0156] Meanwhile, by setting the temperature equalization element 300 to extend along the first direction, the extension direction of the temperature equalization element 300 can be consistent with the arrangement direction of the multiple battery cells 111. In this way, the temperature equalization element 300 can be used to adjust the temperature difference between the multiple battery cells 111, thereby improving the overall temperature uniformity of the battery assembly 100.

[0157] In some embodiments, combined with Figure 3 , Figure 4 and Figure 8 As shown, at least two spaced-apart temperature equalizers 300 are provided in the first direction. The at least two temperature equalizers 300 can be used in conjunction to perform temperature equalization on a plurality of battery cells 111 arranged in the first direction, thereby improving the temperature equalization effect of the temperature equalizers 300 on the plurality of battery cells 111.

[0158] It should be noted that the statement that at least two spaced-apart temperature equalizers 300 are provided in the first direction means that two or more spaced-apart temperature equalizers 300 can be provided in the first direction.

[0159] In some embodiments, such as Figure 3 and Figure 7 As shown, the battery assembly 100 includes multiple battery packs 110 arranged along a second direction. Each battery pack 110 includes multiple individual battery cells 111. The second direction intersects with the first direction. It should be noted that the second direction referred to here can be understood as... Figure 3 As shown in the X direction, by setting multiple battery packs 110 arranged along the second direction, the multiple battery packs 110 work together to further improve the capacity and voltage of the battery device 1000, so as to provide power to the electrical device 2000 using the battery device 1000, so that the electrical device 2000 can operate normally.

[0160] Optionally, combined Figure 3 , Figure 4 and Figure 8 As shown, the temperature equalization element 300 includes multiple elements arranged along the second direction, such that each battery pack 110 corresponds to at least one temperature equalization element 300. This allows each battery pack 110 to undergo temperature equalization treatment through the temperature equalization element 300, improving the overall temperature uniformity of the battery assembly 100.

[0161] It should be noted that the setting of at least one temperature equalizer 300 for each battery pack 110 means that each battery pack 110 corresponds to one temperature equalizer 300, or each battery pack 110 corresponds to two or more temperature equalizers 300, so that each battery pack 110 can be temperature equalized by the temperature equalizer 300.

[0162] In some embodiments, the phase change working fluid satisfies at least one of the following conditions:

[0163] The supercritical temperature range of phase change working fluids is 200℃~270℃;

[0164] The triple point temperature of the phase change working fluid ranges from -110℃ to 80℃.

[0165] The supercritical pressure of the phase change working fluid ranges from 4 MPa to 5.5 MPa.

[0166] The surface tension of the phase change working fluid ranges from 0.015 N / m to 0.035 N / m;

[0167] The liquid density of the phase change working fluid ranges from 700 kg / m³ to 900 kg / m³.

[0168] The latent heat enthalpy difference of the phase change working fluid ranges from 280 kJ / kg to 350 kJ / kg.

[0169] The viscosity of the phase change working fluid ranges from 2*10. -4 Pa·s ~4*10 -4 Pa·s.

[0170] When the battery cell 111 experiences thermal runaway, the temperature is typically above 150°C. By setting the supercritical temperature of the phase change working medium (i.e., the failure temperature of the phase change working medium) to 200°C~270°C, it is ensured that the temperature equalization element 300 can always work normally before the battery cell 111 reaches the most dangerous state, thereby improving the working performance of the temperature equalization element 300 and making it easier to suppress the temperature rise using the temperature equalization element 300, thus improving the working performance of the battery device 1000.

[0171] In addition, the normal operating temperature of the battery device 1000 is usually between -20°C and 60°C. Setting the supercritical temperature of the phase change working medium at a high level (200°C+) ensures that the phase change working medium can be in the ideal subcritical region within the normal operating range of the battery device 1000, thereby maximizing the phase change heat transfer efficiency of the phase change working medium and improving the performance of the temperature equalizer 300.

[0172] By setting the triple point temperature range of the phase change working fluid to -110℃ to 80℃, it means that the phase change working fluid can remain liquid in any environment above this temperature (-110℃), ensuring that even if the battery device 1000 is placed in an extreme low temperature environment, the temperature equalization component 300 will not be damaged by the freezing of the phase change working fluid, thus creating an extremely wide and reliable operating window for the battery device 1000.

[0173] By setting the supercritical pressure range of the phase change working fluid to 4MPa~5.5MPa, the risk of the temperature homogenizer 300 bursting is greatly reduced. At the same time, the supercritical pressure and supercritical temperature are interrelated. This pressure range usually corresponds to a very ideal temperature window, ensuring that the temperature homogenizer 300 can continue to work efficiently before thermal runaway occurs. Within this pressure range, the phase change working fluid has good physical property differences (such as density difference and surface tension) between its liquid and gaseous states, which is conducive to generating strong capillary driving force and efficient phase change heat transfer, thereby improving the temperature homogenization performance of the temperature homogenizer 300.

[0174] By setting the surface tension of the phase change working fluid to a range of 0.015 N / m to 0.035 N / m, within this range, the phase change working fluid can generate sufficiently strong capillary force in the micropores of the wick 330, thereby significantly improving the maximum heat transfer capacity of the temperature equalizer 300 and facilitating stable and sufficient reflux of the phase change working fluid, thus enhancing the reliability of the temperature equalizer 300.

[0175] It should be noted that the flow resistance of the liquid phase change working fluid in the 330 micropores of the wick is related to the density and viscosity of the phase change working fluid. The range of the liquid density of the phase change working fluid is set to 700 kg / m³. 3 ~900kg / m 3 And set the viscosity range of the phase change working fluid to 2*10. -4 Pa·s ~4*10 -4 Pa·s allows for smooth flow of the phase change working fluid, thus enabling a higher volumetric flow rate under the same capillary driving force. This allows for the delivery of more phase change working fluid to meet the needs of the evaporation end, improving the temperature uniformity of the temperature uniformity of the temperature uniformity element 300 to the battery module 100.

[0176] By setting the latent heat enthalpy difference of the phase change working fluid to a range of 280KJ / KG~350KJ / KG, phase change working fluids with this latent heat range (such as acetone and methanol) usually also have a low boiling point and a small liquid density. This means that the overall heat capacity of the temperature equalizer 300 is small. When the battery device 1000 is preheated at low temperature, the temperature equalizer 300 can start up and start working more quickly, shortening the time for the battery cell 111 to reach the ideal operating temperature.

[0177] In summary, by setting the above conditions, this application can improve the performance of the phase change working fluid, thereby improving the temperature homogenization effect of the homogenizer 300.

[0178] The energy storage device 1100 of this application is described below with reference to the accompanying drawings.

[0179] like Figure 2 As shown, the energy storage device 1100 of this application embodiment includes the battery device 1000 of the above embodiment, and the battery device 1000 is used to store or provide electrical energy.

[0180] Since the battery device 1000 of this application embodiment has the above-mentioned technical effects, the energy storage device 1100 of this application embodiment also has the above-mentioned technical effects. That is, by adopting the battery device 1000 of this application, the working performance of the energy storage device 1100 can be improved to a certain extent, the service life of the energy storage device 1100 can be extended, and the safety of the energy storage device 1100 can be improved.

[0181] The following description of an embodiment of the electrical device 2000 of this application is based on the accompanying drawings.

[0182] Combination Figure 1 and Figure 2 As shown, the electrical device 2000 in this application embodiment includes the battery device 1000 or the energy storage device 1100 of the above embodiment. The battery device 1000 is used to store or provide electrical energy.

[0183] Since the battery device 1000 and energy storage device 1100 of the present application have the above-mentioned technical effects, the power consumption device 2000 of the present application also has the above-mentioned technical effects. That is, by adopting the battery device 1000 or energy storage device 1100 of the present application, the working performance of the power consumption device 2000 can be improved, the safety of the power consumption device 2000 can be improved, and the service life of the power consumption device 2000 can be extended.

[0184] It is understood that the specific structures of other components of the battery device 1000, energy storage device 1100 and power consumption device 2000 according to the embodiments of this application, such as controller 1200, motor 1300, etc., are known to those skilled in the art and will not be described in detail here.

[0185] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0186] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery device, characterized by, The application relates to a battery assembly (100), a heat exchange component (200) for heat exchange with the battery assembly (100), and a temperature equalizing component (300) comprising a second housing (310), a gas-liquid two-phase phase change working medium and a wick (330), wherein the phase change working medium and the wick (330) are filled into the second housing (310), the second housing (310) is fixedly connected to the battery assembly (100) and / or the first housing (210), an installation groove (211) is arranged on the outer surface of the first housing (210), and at least part of the second housing (310) is accommodated in the installation groove (211). The first housing (210) is provided with a heat exchange flow channel (212) formed therein, the heat exchange flow channel (212) is adapted to be filled with a heat exchange medium, the heat exchange medium is adapted to be in heat exchange with the battery assembly (100), and the installation groove (211) is arranged at intervals with at least part of the heat exchange flow channel (212). The heat exchange flow channel (212) comprises a plurality of flow channel segments (2121), and the plurality of flow channel segments (2121) are arranged at intervals, with the installation groove (211) being arranged between two adjacent flow channel segments (2121). The first housing (210) is provided with oppositely arranged first and second side plates (213 and 214), the first side plate (213) is arranged towards the battery assembly (100), and the installation groove (211) is formed on the first side plate (213) and / or the second side plate (214).

2. The battery device according to claim 1, characterized by Part of the first side plate (213) is recessed towards the second side plate (214) to form the installation groove (211) on the side of the first side plate (213) facing the battery assembly (100).

3. The battery device of claim 2, wherein, The second side plate (214) is provided with a matching groove (2141) on the side facing the first side plate (213), and the installation groove (211) is arranged in the matching groove (2141).

4. The battery device of claim 2, wherein The groove width of the matching groove (2141) is greater than that of the installation groove (211), and the groove wall of the matching groove (2141) and the groove wall of the installation groove (211) form the heat exchange flow channel (212).

5. The battery device of claim 4, wherein, Part of the second side plate (214) is recessed away from the first side plate (213) to form the matching groove (2141).

6. The battery device of claim 5, wherein, Part of the second side plate (214) is recessed away from the first side plate (213) to form the installation groove (211) on the side of the second side plate (214) away from the first side plate (213) and to form the heat exchange flow channel (212) between the second side plate (214) and the first side plate (213).

7. The battery device of claim 6, wherein The battery assembly (100) comprises a plurality of battery monomers (111), the plurality of battery monomers (111) are arranged along a first direction, and the temperature equalizing component (300) extends along the first direction.

8. The battery device of claim 6, wherein ​ 9. The battery device of claim 4, wherein, ​ 10. The battery device of claim 1, wherein ​ 11. The battery device of claim 10, wherein, At least two of the uniform temperature pieces (300) are arranged in the first direction.

12. The battery device of claim 10, wherein, The battery assembly (100) comprises a plurality of battery groups (110), and the plurality of battery groups (110) are arranged in a second direction, each of the battery groups (110) comprises a plurality of battery monomers (111), and the second direction intersects the first direction. The uniform temperature pieces (300) comprise a plurality of uniform temperature pieces (300), and the plurality of uniform temperature pieces (300) are arranged in the second direction, so that each of the battery groups (110) corresponds to at least one of the uniform temperature pieces (300).

13. The battery device of claim 1, wherein, The second shell (310) is an aluminum shell; and / or the liquid absorption core (330) is made of aluminum.

14. The battery device of claim 1, wherein, The battery assembly (100) further comprises a box (400) and a battery monomer (111), the box (400) defines a mounting cavity (410), the battery monomer (111) is arranged in the mounting cavity (410), and the heat exchange piece (200) is arranged outside the box (400) and opposite to the battery monomer (111). The uniform temperature piece (300) is arranged between the heat exchange piece (200) and the box (400); or the uniform temperature piece (300) is arranged on a side of the heat exchange piece (200) away from the box (400).

15. The battery device of any one of claims 1-14, wherein, The phase change working medium satisfies at least one of the following conditions: The supercritical temperature of the phase change working medium ranges from 200 DEG C to 270 DEG C; The triple point temperature of the phase change working medium ranges from -110 DEG C to 80 DEG C; The supercritical pressure of the phase change working medium ranges from 4 MPa to 5.5 MPa; The surface tension of the phase change working medium ranges from 0.015 N / m to 0.035 N / m; The liquid density of the phase change working medium ranges from 700 kg / m³ to 900 kg / m³; The latent heat enthalpy difference of the phase change working medium ranges from 280 KJ / KG to 350 KJ / KG; The viscosity of the phase change working medium is in the range of 2*10 -4 Pa·s~4*10 -4 Pa·s.

16. An energy storage device, characterized by The battery device according to any one of claims 1-15 is used for storing or providing electric energy.

17. An electrical device, comprising: The battery device according to any one of claims 1-15 or the energy storage device according to claim 16 is used for storing or providing electric energy.

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