Battery device, electric equipment and energy storage equipment

Abstract

The utility model relates to the technical field of batteries, and provides a battery device, electric equipment and energy storage equipment, the battery device comprises a battery monomer and a heat exchange plate, and the heat exchange plate is arranged on the large surface side of the battery monomer. The heat exchange plate comprises a plate body, and a heat exchange channel and a closed cavity which are not communicated are formed in the plate body. The heat exchange channel is configured to be capable of circulating a heat exchange medium so as to exchange heat with the large-surface side of the single battery; the cavity wall, facing the single battery, of the closed cavity is attached to the large surface side of the single battery, and the closed cavity is filled with a phase change working medium. By utilizing the characteristic that the phase change working medium can quickly absorb heat when reaching a phase change point due to high temperature, the single battery can be quickly cooled by the phase change working medium in the heating process before thermal runaway, so that the risk that the single battery continues to be subjected to thermal runaway is reduced, and the problem of thermal runaway of the single battery in the battery device is solved. The electric equipment and the energy storage equipment both comprise the battery device, and have the same technical effects as the battery device.

Description

Technical Field

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

[0002] New energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are being used more and more in the field of energy storage.

[0003] However, when a single battery cell in a battery device experiences a short circuit, its temperature rises rapidly, which can lead to thermal runaway. This can also cause adjacent battery cells to experience thermal runaway, resulting in the spread of thermal runaway.

[0004] The above statements are for the purpose of providing background information in relation to this application only and do not necessarily constitute prior art. Utility Model Content

[0005] In view of the above problems, embodiments of this application provide a battery device, an electrical device, and an energy storage device that can improve the thermal runaway problem of individual battery cells in the battery device.

[0006] In a first aspect, embodiments of this application provide a battery device, comprising:

[0007] Battery cell;

[0008] The heat exchange plate is located on the large side of the battery cell.

[0009] The heat exchange plate includes:

[0010] The plate body has non-connected heat exchange channels and closed cavities inside;

[0011] The heat exchange channel is configured to allow the flow of heat exchange medium for heat exchange with the large surface area of ​​the battery cell.

[0012] The cavity wall facing the battery cell is attached to the large side of the battery cell, and the cavity is filled with a phase change working fluid.

[0013] In the above technical solution, by setting a closed cavity inside the heat exchange plate and filling the closed cavity with a phase change working fluid, the phase change working fluid can rapidly absorb heat when it reaches its phase change point at high temperatures. This allows the battery cells to be rapidly cooled by the phase change working fluid during the heating process before thermal runaway, thereby reducing the risk of further thermal runaway of the battery cells and improving the thermal runaway problem of battery cells in the battery device. Moreover, the heat exchange plate is located on the large side of the battery cell, and a heat exchange channel is also set inside the heat exchange plate, which can exchange heat for the large side of the battery cell. This ensures that there is sufficient heat exchange area between the heat exchange plate and the battery cell. Even if the closed cavity containing the phase change working fluid occupies part of the structure of the heat exchange plate, it will not affect the effective heat exchange between the heat exchange plate and the battery cell.

[0014] In some embodiments, the amount of phase change working fluid is less than or equal to the internal volume of the enclosed cavity.

[0015] In the above technical solution, by setting the amount of phase change working fluid (PCM) to be less than the internal volume of the sealed cavity, on the one hand, the impact of excessive PCM in the sealed cavity on sealing can be reduced, leading to difficulties in sealing, weak sealing, and incomplete sealing. It can also reduce the probability of the PCM undergoing a phase change due to heat during the sealing operation. On the other hand, after the PCM undergoes a phase change, it expands, and the unfilled space within the sealed cavity can accommodate the expanded PCM, reducing the risk of the expanded PCM damaging the sealed cavity. By setting the amount of PCM equal to the internal volume of the sealed cavity, the sealed cavity can hold more PCM, allowing it to absorb more heat during the temperature rise process before the battery cell experiences thermal runaway, further reducing the risk of the battery cell continuing to experience thermal runaway.

[0016] In some embodiments, the heat exchange plate further includes:

[0017] A current collector is disposed at the end of the plate along its length.

[0018] A blocking plate is installed between the manifold and the plate.

[0019] The sealing plate is provided with a connecting hole, which is used to connect the heat exchange channel and the manifold;

[0020] The sealing plate has a sealing part on the side facing the plate, which is used to seal the closed cavity.

[0021] In the above technical solution, by setting a sealing plate, the original heat exchange plate can be transformed into the heat exchange plate in the cost solution. That is, the sealing plate is designed between the manifold and the plate body, and the sealing plate can connect the heat exchange channel and the manifold, so that the heat exchange medium can flow in the heat exchange channel. In addition, the sealing plate can also seal the closed cavity, so that the closed cavity can form a sealed space to meet the requirements of filling the phase change working medium. The above structural design has the characteristics of less process modification and low modification cost.

[0022] In some embodiments, the phase change working medium is a gas-liquid phase change working medium, and the external coating of the phase change working medium is an encapsulation structure.

[0023] In the above technical solution, by setting an encapsulation structure to encapsulate the gas-liquid phase change working fluid, when sealing the closed cavity with a sealing plate, the encapsulation structure can isolate the gas-liquid phase change working fluid and the sealing plate, limiting the unstable gas-liquid phase change working fluid from touching the connection point between the sealing plate and the closed cavity, thereby reducing the impact on the sealing operation, improving the firmness and sealing performance between the sealing plate and the closed cavity, and also reducing the probability of the gas-liquid phase change working fluid undergoing a phase change due to heat during the sealing operation.

[0024] In some embodiments, the encapsulation structure is a closed shell structure adapted to a closed cavity.

[0025] In the above technical solution, by designing the encapsulation structure as a shell-like structure adapted to the closed cavity, on the one hand, the encapsulation structure can have a larger internal space to hold more phase change working fluid; on the other hand, the phase change working fluid built into the encapsulation structure can be closer to the inner wall of the closed cavity. In this way, the heat transferred to the cavity wall of the closed cavity before the battery cell thermal runaway can be absorbed by the phase change working fluid more quickly, which is conducive to the rapid cooling of the battery cell and thus reduces the risk of the battery cell continuing to thermal runaway.

[0026] In some embodiments, the side of the sealing patch facing the closed cavity abuts against the encapsulation structure; or, the side of the sealing patch facing the closed cavity is fixedly connected to the encapsulation structure.

[0027] In the above technical solution, by setting the connection between the sealing plate and the encapsulation structure to be abutting or fixed connection, the encapsulation structure can be stably placed in the encapsulation cavity after the sealing plate seals the cavity, limiting the swaying of the phase change working fluid in the encapsulation cavity and improving the stability of the structure.

[0028] In some embodiments, the phase change working medium is a solid-liquid phase change working medium, and a gap is formed between the end of the phase change working medium near the sealing plate and the sealing plate.

[0029] In the above technical solution, since the phase change working medium is a solid-liquid phase change working medium, it is in a solid state when filling the closed cavity. Based on this, an appropriate gap is set between the sealing plate and the phase change working medium, that is, the end of the phase change working medium is kept at a certain distance from the connection position of the sealing plate and the closed cavity. This ensures that the heat generated when the sealing plate connects and seals the closed cavity will not affect the phase change of the phase change working medium. This also reduces the impact of the phase change working medium after phase change on the connection effect of the sealing plate.

[0030] In some embodiments, the cross-sectional shape of the phase change working fluid is consistent with the cross-sectional shape of the closed cavity.

[0031] In the above technical solution, by setting the cross-sectional shapes of the phase change working medium and the closed cavity to be the same, the outer peripheral surface of the solid phase change working medium can be attached to the inner wall of the closed cavity. In this way, the heat transferred to the cavity wall of the closed cavity before the battery cell thermal runaway can be absorbed by the phase change working medium more quickly, which is conducive to the rapid cooling of the battery cell and thus reduces the risk of the battery cell continuing to thermal runaway.

[0032] In some embodiments, the cavity wall of the enclosed cavity is provided with a working fluid injection hole that can be sealed. The working fluid injection hole is used to inject a liquid phase change working fluid or a gas phase phase change working fluid into the enclosed cavity.

[0033] In the above technical solution, by setting the injection port, the liquid or gas phase change working medium can be directly injected into the closed cavity, which is convenient to operate. Moreover, the injection port can be sealed by low-temperature connection methods such as adhesive bonding. During the sealing process, the phase change working medium will not undergo phase change. Therefore, the filling amount of phase change working medium can be equal to the internal volume of the closed cavity, so that there is more phase change working medium in the heat exchange plate. This allows it to absorb more heat during the heating process before the battery cell thermal runaway, further reducing the risk of the battery cell continuing to thermal runaway.

[0034] In some embodiments, the end of the enclosed cavity along the length of the plate is provided with a working fluid injection hole, which is sealed by a sealing structure.

[0035] In the above technical solution, by setting the injection hole at the end of the closed cavity along the length of the plate, it is easy to process and will not damage the integrity of the plate by opening a hole on the outer circumference of the plate, which is conducive to improving the structural strength of the plate.

[0036] In some embodiments, the area of ​​the surface of the heat exchange plate facing the large side of the battery cell is the first area;

[0037] The plane containing the large side of the battery cell is the projection plane, and the area of ​​the orthographic projection of the enclosed cavity onto the projection plane is the second area.

[0038] The ratio of the second area to the first area is M, where M satisfies: 0.05≤M≤0.8.

[0039] In the above technical solution, by setting the range of the ratio of the second area to the first area, the surface of the heat exchange plate that is in contact with the large side of the battery cell can have a phase change surface of appropriate area. The phase change surface on the heat exchange plate is used to transfer the heat released by the battery cell before thermal runaway to the phase change working medium in the closed cavity. The phase change surface of appropriate area helps the phase change working medium to absorb heat quickly, so that the battery cell can cool down quickly, thereby reducing the risk of the battery cell continuing to run away from thermal runaway.

[0040] In some embodiments, a terminal post is provided on one side of the battery cell in the height direction;

[0041] The heat exchange channels and the enclosed cavity are arranged along the height of the battery cell, and at least some of the heat exchange channels are closer to the electrode than the enclosed cavity.

[0042] In the above technical solution, since the area near the terminal post of the battery cell generates a large amount of heat during the charging and discharging process, by setting up heat exchange channels and enclosed cavities along the height direction of the battery cell and making the heat exchange channels closer to the terminal post, the heat exchange channels can be aligned with the large surface area of ​​the battery cell near the terminal post. This facilitates timely heat exchange of the battery cell and enables the battery cell to maintain a suitable operating temperature. At the same time, the enclosed cavity can be relatively far away from the large surface area of ​​the battery cell where the heat is large, which can reduce the risk of phase change caused by the normal high temperature on the battery cell accidentally triggering the phase change working medium in the enclosed cavity.

[0043] In some embodiments, the heat exchange channel and the enclosed cavity are adjacent to each other.

[0044] In the above technical solution, by setting the heat exchange channel and the closed cavity adjacent to each other, the phase change working medium in the closed cavity can exchange heat with the heat exchange medium in the heat exchange channel. When the phase change working medium undergoes a phase change, the heat of the phase change working medium can be carried away by the heat exchange medium to reduce the temperature around the battery cell, thereby reducing the risk of the battery cell continuing to experience thermal runaway.

[0045] In some embodiments, the plate body has an isolation cavity that is not connected to either the heat exchange channel or the closed cavity, and the isolation cavity is located between the heat exchange channel and the closed cavity.

[0046] In the above technical solution, by setting an isolation cavity between the heat exchange channel and the closed cavity, the distance between the phase change working medium in the closed cavity and the heat exchange medium in the heat exchange channel can be increased, thereby reducing the risk of phase change of the working medium caused by false triggering of the high-temperature heat exchange medium.

[0047] In some embodiments, the number of heat exchange plates is multiple, and the multiple heat exchange plates are arranged at intervals along a direction perpendicular to the large surface side of the battery cell.

[0048] The plane containing the large side of a single battery cell is the projection plane;

[0049] In two adjacent heat exchange plates, the orthographic projection of the closed cavity on the projection plane on one heat exchange plate does not completely coincide with the orthographic projection of the closed cavity on the projection plane on the other heat exchange plate.

[0050] In the above technical solution, each heat exchange plate can correspond to a different large surface side of the battery cell, and two adjacent heat exchange plates can be attached to different large surface sides of the same battery cell. Based on this, since the orthographic projections of the closed cavities on the adjacent two heat exchange plates do not completely overlap on the projection plane, the battery cell can have a wider area corresponding to the phase change working fluid in the closed cavity, so that the phase change working fluid can be triggered in time during the heating process before the battery cell thermal runaway. This can improve the cooling rate of the battery cell, thereby reducing the risk of the battery cell continuing to thermal runaway.

[0051] In some embodiments, the battery device further includes:

[0052] The box-shaped structure has an internal cavity.

[0053] Both the battery cells and the heat exchange plates are housed within the inner cavity;

[0054] There are multiple heat exchange plates, and these multiple heat exchange plates divide the inner cavity into multiple battery housing cavities;

[0055] There are multiple battery cells, and these multiple battery cells are placed in multiple battery housing cavities;

[0056] Each battery cell has a heat exchange plate on its large side.

[0057] In the above technical solution, by configuring a heat exchange plate on each large-area side of each battery cell, on the one hand, different large-area sides of the same battery cell can exchange heat through the heat exchange medium in the heat exchange plate, which can improve the heat exchange efficiency of the battery cell; on the other hand, different large-area sides of the same battery cell can absorb the heat during the heating process before thermal runaway of the battery cell through the phase change working medium in the heat exchange plate, which can increase the cooling rate of the battery cell and reduce the risk of the battery cell continuing to undergo thermal runaway.

[0058] Secondly, embodiments of this application also provide an electrical device, including a battery device provided in any of the embodiments of the first aspect, the battery device being used to provide electrical energy.

[0059] Thirdly, embodiments of this application also provide an energy storage device, including a battery device provided in any of the embodiments of the first aspect, the battery device being used to store electrical energy. Attached Figure Description

[0060] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art 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.

[0061] Figure 1 This is a schematic diagram of the structure of a vehicle provided according to some embodiments of this application;

[0062] Figure 2 This is an exploded structural diagram of a first battery device provided according to some embodiments of this application;

[0063] Figure 3 This is a schematic diagram illustrating the assembly relationship between a battery cell and a heat exchange plate according to some embodiments of this application;

[0064] Figure 4 This is an exploded structural diagram of a first type of heat exchange plate provided according to some embodiments of this application;

[0065] Figure 5 for Figure 4 A magnified structural diagram of part A in the middle;

[0066] Figure 6 This is a three-dimensional structural schematic diagram of the sealing plate provided according to some embodiments of this application;

[0067] Figure 7 This is a three-dimensional structural diagram of a phase change working fluid with an encapsulation structure provided according to some embodiments of this application;

[0068] Figure 8 for Figure 7 A magnified structural diagram of part B in the diagram; in which the encapsulation structure is partially sectioned;

[0069] Figure 9 This is a schematic diagram showing the connection relationship between the encapsulation structure and the sealing sheet according to some embodiments of this application;

[0070] Figure 10 for Figure 9 A magnified structural diagram of part C in the middle;

[0071] Figure 11 This is a schematic diagram of the internal structure of a first type of heat exchange plate provided according to some embodiments of this application;

[0072] Figure 12 This is an exploded structural diagram of a second type of heat exchange plate provided according to some embodiments of this application;

[0073] Figure 13 for Figure 12 A magnified structural diagram of part D in the middle;

[0074] Figure 14 This is a schematic diagram of the internal structure of a third type of heat exchange plate that cooperates with a battery cell, according to some embodiments of this application;

[0075] Figure 15 This is a schematic diagram of the internal structure of a fourth type of heat exchange plate that cooperates with a battery cell, according to some embodiments of this application;

[0076] Figure 16 This is a schematic diagram of the internal structure of a fifth type of heat exchange plate that cooperates with a battery cell, according to some embodiments of this application;

[0077] Figure 17 This is a schematic diagram illustrating the assembly relationship between two adjacent heat exchange plates and the same battery cell according to some embodiments of this application;

[0078] Figure 18 This is a schematic diagram of the internal structure of a second battery device provided according to some embodiments of this application.

[0079] The attached figures are labeled as follows:

[0080] 1000 - Vehicles;

[0081] 100 - Battery device, 110 - Battery cell assembly, 120 - Housing, 1201 - First housing, 1202 - Second housing;

[0082] 200-Controller;

[0083] 300-motor;

[0084] 10 - Battery cell, 101 - Large side surface, 102 - Terminal post;

[0085] 20-Heat exchange plate, 201-Plate body, 2011-Heat exchange channel, 2012-Enclosed cavity, 20121-Injection port, 2013-Isolation cavity, 202-Manifold, 203-Blocking plate, 2031-Connecting hole, 2032-Blocking part;

[0086] 30 - Phase change working fluid; 301 - Encapsulation structure;

[0087] 40-beam;

[0088] 50-Insulation Pad;

[0089] L - gap, X - length direction of the battery cell, Y - height direction of the battery cell, Z - thickness direction of the battery cell. Detailed Implementation

[0090] 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.

[0091] Unless otherwise defined, all technical and scientific terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the embodiments of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0092] The term "embodiment" as used in this application 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 in 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 in this application can be combined with other embodiments.

[0093] The specific term "exemplary" used in the embodiments of this application means "serving as an example, embodiment, or illustration." Any embodiment illustrated as "exemplary" is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0094] In the description of the embodiments of this application, the technical terms "first", "second", "third", etc. are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0095] In the description of the embodiments in this application, the technical 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, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0096] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it 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 this application can be understood according to the specific circumstances.

[0097] In the description of the embodiments of this application, the technical terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship in the working state of the embodiments of this application. They are only used to facilitate the description of the embodiments of this application and to simplify 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 this application.

[0098] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0099] In the description of the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; at the same time, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering.

[0100] In the description of the embodiments of this application, "multiple" means two or more (including two), unless otherwise explicitly specified.

[0101] In the description of 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, and other dimensions of various components in the embodiments of this application shown in the drawings, as well as the overall thickness, length, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0102] 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.

[0103] To provide sufficient power to a battery pack, multiple battery cells are typically stacked within the pack's casing. However, the continuous charging and discharging of these cells generates significant heat, causing the internal temperature of the battery pack to rise. The stacked structure exacerbates this phenomenon, severely impacting the battery pack's performance and lifespan, and potentially posing significant safety hazards for consumers. Therefore, related technologies often incorporate heat exchange plates inside the battery pack to cool the individual cells. However, due to excessively high internal temperatures or short circuits, individual cells can rapidly heat up, leading to thermal runaway. This runaway can also spread to adjacent cells. While existing heat exchange plates can cool individual cells, their low thermal conductivity is insufficient to effectively dissipate the heat generated by the rapid temperature rise before thermal runaway.

[0104] To address the aforementioned problems, this application provides a battery device comprising a battery cell and a heat exchange plate disposed on the large-area side of the battery cell. The heat exchange plate has a heat exchange channel and a sealed cavity inside. A heat exchange medium flows through the heat exchange channel and can exchange heat with the large-area side of the battery cell. The sealed cavity is filled with a phase change working fluid. By utilizing the characteristic of the phase change working fluid to rapidly absorb heat when it reaches its phase change point at high temperatures, the battery cell can be rapidly cooled by the phase change working fluid during the heating process before thermal runaway, thereby reducing the risk of further thermal runaway of the battery cell and improving the thermal runaway problem of the battery cell in the battery device.

[0105] The technical solutions provided in this application are applicable to electrical equipment that uses battery devices as a power source and energy storage devices that use battery devices as energy storage elements. Electrical equipment can be vehicles, ships, spacecraft, etc. Energy storage devices can be energy storage containers, energy storage cabinets, etc.

[0106] For ease of description, this application uses the application of a battery device in a vehicle as an example for illustration.

[0107] refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle according to some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 100 is disposed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0108] In some embodiments, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0109] refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery device according to some embodiments of this application. The battery device includes a housing 120 and a battery cell assembly 110. The housing 120 has a receiving cavity, in which the battery cell assembly 110 is received.

[0110] In some embodiments, a battery apparatus may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or in a mixed configuration via a busbar.

[0111] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0112] As an example, a battery cell assembly can be a battery module, which consists of multiple battery cells arranged and fixed together to form an independent module.

[0113] As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0114] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0115] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0116] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0117] As an example, such as Figure 2 As shown, the housing 120 may include a first housing 1201 and a second housing 1202. The first housing 1201 and the second housing 1202 are fastened together to form a closed space inside the housing 120 to house the battery cell assembly 110. Here, "closed" refers to covering or closing, which can be sealed or unsealed. The first housing 1201 may be a top cover or a bottom plate.

[0118] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0119] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0120] In some embodiments, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0121] As an example, the battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited in this regard.

[0122] As an example, the battery cell can be a prismatic battery cell or a battery cell with other shapes having a large surface area. Prismatic battery cells include square-shell battery cells with a large surface area, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. The embodiments of this application are not limited in this respect.

[0123] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings. The technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0124] refer to Figure 3 , Figure 4 and Figure 11 , Figure 3 This is a schematic diagram illustrating the assembly relationship between a battery cell and a heat exchange plate according to some embodiments of this application; Figure 4 This is an exploded structural diagram of a first type of heat exchange plate provided according to some embodiments of this application; Figure 11This is a schematic diagram of the internal structure of a first type of heat exchange plate provided according to some embodiments of this application.

[0125] Firstly, such as Figure 3 and Figure 11 As shown, an embodiment of this application provides a battery device, which includes a battery cell 10 and a heat exchange plate 20. The heat exchange plate 20 is disposed on the large surface side 101 of the battery cell 10. The heat exchange plate 20 includes a plate body 201, and the interior of the plate body 201 is provided with a non-communicating heat exchange channel 2011 and a closed cavity 2012. The heat exchange channel 2011 is configured to allow the flow of a heat exchange medium for heat exchange with the large surface side 101 of the battery cell 10. The cavity wall of the closed cavity 2012 facing the battery cell 10 is attached to the large surface side 101 of the battery cell 10, and the closed cavity 2012 is filled with a phase change working fluid 30.

[0126] Specifically, such as Figure 3 As shown, the large surface 101 of the battery cell 10 refers to the plane with the largest area on the outer surface of the battery cell 10. For example, the prismatic battery cell 10 has two large surface 101s arranged opposite to each other in its thickness direction.

[0127] Optionally, such as Figure 4 As shown, the heat exchange plate 20 can be a harmonica tube.

[0128] Optionally, the heat exchange plate 20 can be a metal part; wherein the material of the metal part can be aluminum alloy, etc. Alternatively, the heat exchange plate 20 can be a plastic part; wherein the material of the plastic part can be polyamide (PA), polyphenylene sulfide (PPS), polyphenylene oxyide (PPO), etc.

[0129] Optionally, such as Figure 3 As shown, the plate 201 can be a long strip-shaped structure, and the plane with the largest area on the outer surface of the plate 201 can be attached to the large surface side 101 of the battery cell 10. The plate 201 can be attached to the large surface side 101 of multiple battery cells 10 simultaneously; for example, multiple battery cells 10 can be arranged along the length of the plate 201, and the large surface sides 101 of the multiple battery cells 10 can be coplanar, with the plane with the largest area on the outer surface of the plate 201 attached to the coplanar large surface sides 101 of the multiple battery cells 10.

[0130] Optionally, such as Figure 11As shown, both the heat exchange channel 2011 and the enclosed cavity 2012 inside the plate 201 can extend along the length of the plate 201. The heat exchange channel 2011 can penetrate the plate 201 in its extending direction, allowing the heat exchange medium circulation system outside the plate 201 to supply heat exchange medium into the heat exchange channel 2011. The enclosed cavity 2012 can be closed at both ends in its extending direction to prevent communication between the heat exchange channel 2011 and the enclosed cavity 2012.

[0131] Optionally, the heat exchange plate 20 can be an air-cooled heat exchange plate 20 or a liquid-cooled heat exchange plate 20, and the heat exchange medium introduced into the heat exchange channel 2011 can be air, water, coolant, etc.

[0132] Specifically, the closed cavity 2012 refers to a sealed cavity formed inside the plate 201 of the heat exchange plate 20. In order to fill the closed cavity 2012 with the phase change working fluid 30, the closed cavity 2012 may have an opening. The phase change working fluid 30 can be filled into the closed cavity 2012 through the opening. After the phase change working fluid 30 is filled, the opening can be sealed. The closed cavity 2012 may be formed by a cavity wall. It should be understood that the cavity wall may be part of the plate 201 of the heat exchange plate 20.

[0133] Specifically, phase change working medium 30 refers to a medium that uses the absorption or release of a large amount of latent heat during the phase change process of a substance to transfer and store heat.

[0134] Optionally, the phase change working medium 30 can be an inorganic salt phase change working medium 30, a paraffin-based phase change working medium 30, a tetrafluoroethyl-trifluoroethyl ether, etc. Among them, the inorganic salt phase change working medium 30 can be a hydrated salt (calcium chloride hexahydrate, magnesium sulfate heptahydrate, aluminum nitrate nonahydrate), a molten salt (potassium nitrate-sodium nitrate mixed salt, sodium carbonate-potassium chloride mixed salt), etc.; the paraffin-based phase change working medium 30 can be n-hexadecane, n-octadecane, etc.

[0135] Optionally, the phase transition point of the phase change working medium 30 can be 20℃-450℃; for example, the phase transition point of the phase change working medium 30 can be 20℃, 30℃, 40℃, 50℃, 60℃, 70℃, 80℃, 90℃, 100℃, 200℃, 300℃, 400℃, 450℃, etc. Further, the phase transition point of the phase change working medium 30 can be 50℃-80℃; for example, the phase transition point of the phase change working medium 30 can be 20℃, 30℃, 40℃, 50℃, 60℃, 70℃, 80℃, etc.

[0136] In the above technical solution, by setting a closed cavity 2012 inside the heat exchange plate 20 and filling the closed cavity 2012 with phase change working fluid 30, the phase change working fluid 30 can rapidly absorb heat when it reaches the phase change point at high temperature. This allows the battery cell 10 to be rapidly cooled by the phase change working fluid 30 during the heating process before thermal runaway, thereby reducing the risk of the battery cell 10 continuing to experience thermal runaway and improving the thermal runaway problem of the battery cell 10 in the battery device. Moreover, the heat exchange plate 20 is located on the large surface side 101 of the battery cell 10, and a heat exchange channel 2011 is also provided inside the heat exchange plate 20, which can exchange heat for the large surface side 101 of the battery cell 10. This ensures that there is sufficient heat exchange area between the heat exchange plate 20 and the battery cell 10. Even if the closed cavity 2012 containing the phase change working fluid 30 occupies part of the structure of the heat exchange plate 20, it will not affect the effective heat exchange between the heat exchange plate 20 and the battery cell 10.

[0137] In some embodiments, the amount of phase change working fluid 30 is less than or equal to the internal volume of the enclosed cavity 2012.

[0138] Specifically, the filling amount of phase change working fluid 30 refers to the volume of phase change working fluid 30 filled in the closed cavity 2012 at room temperature.

[0139] It should be noted that after the phase change working fluid 30 is filled into the closed cavity 2012 through the pre-reserved opening, a sealing structure is needed to seal the opening (i.e., sealing operation) so that the phase change working fluid 30 can be sealed in a closed cavity. Furthermore, the sealing structure can be used to seal the opening by welding, adhesive bonding, or other methods.

[0140] If the heat exchange plate 20 is made of metal and welding is used, the high temperature generated during welding (exceeding the melting point of the metal, constituting a high-temperature connection) can easily cause the phase change working medium 30 inside the sealed cavity 2012 to reach its phase change point, resulting in the phase change working medium 30 melting into a liquid phase or becoming a gaseous phase. The liquid or gaseous phase change working medium 30 is unstable and easily comes into contact with the welding position of the sealing structure and the opening, thus affecting the welding effect. Therefore, when the heat exchange plate 20 is made of metal and welding is used during the sealing operation, the filling amount of the phase change working medium 30 can be set to be less than the internal volume of the sealed cavity 2012, so that the phase change working medium 30 can maintain an appropriate distance from the welding position, preventing the heat during welding from causing a phase change in the phase change working medium 30. Figure 11 As shown.

[0141] If the heat exchange plate 20 is made of plastic and is welded, the temperature generated during welding is much lower than that when welding metal parts, which is a low-temperature connection scheme. The temperature during welding is not likely to cause the phase change working medium 30 to reach the phase change point. Therefore, the filling amount of the phase change working medium 30 can be set to be equal to the internal volume of the closed cavity 2012, so that the same closed cavity 2012 can contain more phase change working medium 30.

[0142] The sealing operation using adhesive is a low-temperature connection scheme. Regardless of whether the heat exchange plate 20 is a metal or plastic part, no high temperature will be generated during the adhesive bonding process. Therefore, the filling amount of phase change working fluid 30 can be set to be equal to the internal volume of the closed cavity 2012, so that the same closed cavity 2012 can contain more phase change working fluid 30.

[0143] In the above technical solution, by setting the filling amount of the phase change working medium 30 to be less than the internal volume of the sealed cavity 2012, on the one hand, the sealing of the sealed cavity 2012 can be reduced, which can lead to difficulties in sealing, weak sealing, and incomplete sealing caused by excessive phase change working medium 30 in the sealed cavity 2012. It can also reduce the probability of the phase change working medium 30 undergoing a phase change due to heat during the sealing operation. On the other hand, after the phase change working medium 30 undergoes a phase change, it will expand. The unfilled space within the sealed cavity 2012 can accommodate the expanded phase change working medium 30, reducing the risk of the phase change working medium 30 damaging the sealed cavity 2012 after expansion. By setting the filling amount of the phase change working medium 30 to be equal to the internal volume of the sealed cavity 2012, the sealed cavity 2012 can accommodate more phase change working medium 30, allowing it to absorb more heat during the temperature rise process before the battery cell 10 experiences thermal runaway, further reducing the risk of the battery cell 10 continuing to experience thermal runaway.

[0144] refer to Figures 4 to 6 , Figure 5 for Figure 4 A magnified structural diagram of part A in the middle; Figure 6 This is a three-dimensional structural diagram of a sealing patch provided according to some embodiments of this application.

[0145] In some embodiments, such as Figure 4 and Figure 5 As shown, the heat exchange plate 20 also includes a collector 202 and a sealing plate 203. The collector 202 is disposed at the end of the plate body 201 in its length direction; the sealing plate 203 is disposed between the collector 202 and the plate body 201. The sealing plate 203 is provided with a connecting hole 2031, which is used to connect the heat exchange channel 2011 and the collector 202. The sealing plate 203 is provided with a sealing part 2032 on the side facing the plate body 201, which is used to seal the closed cavity 2012.

[0146] Specifically, the flow collector 202 refers to the structure in the heat exchange plate 20 used for converging and distributing the heat exchange medium. The flow collector 202 can be a plate-shaped structure, a tubular structure, or other shapes. The flow collector 202 can be provided with a flow channel for the heat exchange medium to flow, and the flow channel is connected to the heat exchange channel 2011 so that the heat exchange medium in the heat exchange channel 2011 can enter the flow collector 202, and the heat exchange medium in the flow collector 202 can also enter the heat exchange channel 2011.

[0147] Optionally, such as Figure 4 As shown, a collector 202 can be installed at each end of the heat exchange plate 20 along the length of the plate body 201.

[0148] Optionally, if there are multiple heat exchange plates 20, the multiple plates 201 can be connected to the same manifold 202.

[0149] Optionally, the connection between the current collector 202 and the plate 201 can be achieved by welding, gluing, snap-fitting, or other methods.

[0150] Specifically, along the length of the plate 201, an opening can be provided at the end of the closed cavity 2012 to facilitate the loading of the phase change working fluid 30 into the closed cavity 2012 from the opening; after the sealing plate 203 is assembled onto the plate 201, it can seal the opening of the closed cavity 2012 and enclose the phase change working fluid 30 in the closed cavity 2012, and the sealing plate 203 will not affect the communication between the heat exchange channel 2011 and the collector 202.

[0151] Optionally, such as Figure 6 As shown, the sealing plate 203 can be in the form of a plate structure. The plate structure has a connecting hole 2031 for connecting the heat exchange channel 2011 and the collector 202. The plate structure has a sealing part 2032 protruding from the side facing the closed cavity 2012. The outer periphery of the sealing part 2032 can be consistent with the opening of the closed cavity 2012. When the sealing plate 203 is assembled onto the plate 201, the sealing part 2032 can extend into the opening of the closed cavity 2012 to seal the opening of the closed cavity 2012.

[0152] In the above technical solution, by setting the sealing plate 203, the original heat exchange plate 20 can be transformed into the heat exchange plate 20 in the solution. That is, the sealing plate 203 is designed between the manifold 202 and the plate 201. The sealing plate 203 can connect the heat exchange channel 2011 and the manifold 202, so that the heat exchange medium can flow in the heat exchange channel 2011. The sealing plate 203 can also seal the closed cavity 2012, so that the closed cavity 2012 can form a sealed space to meet the requirements of filling the phase change working fluid 30. The above structural design has the characteristics of less process modification and low modification cost.

[0153] refer to Figures 7 to 10 , Figure 7 This is a three-dimensional structural diagram of a phase change working fluid with an encapsulation structure provided according to some embodiments of this application; Figure 8 for Figure 7 A magnified structural diagram of part B in the diagram; in which the encapsulation structure is partially sectioned; Figure 9 This is a schematic diagram showing the connection relationship between the encapsulation structure and the sealing sheet according to some embodiments of this application; Figure 10 for Figure 9 A magnified structural diagram of part C in the middle.

[0154] In some embodiments, such as Figure 7 and Figure 8 As shown, the phase change working medium 30 is a gas-liquid phase change working medium, and the external coating of the phase change working medium 30 is an encapsulation structure 301.

[0155] Specifically, a gas-liquid phase change working medium refers to a working medium 30 that is in the liquid phase at room temperature, and that undergoes a phase change and can become gaseous when it reaches its phase change point. For example, a gas-liquid phase change working medium can be tetrafluoroethyl-trifluoroethyl ether, etc.

[0156] Specifically, the encapsulation structure 301 can be shaped into a structure with an internal space and a reserved injection port. The phase change working medium 30, which is in the liquid phase, can be injected into the encapsulation structure 301 through the injection port. Then the injection port is closed, so that the phase change working medium 30 is encapsulated in the encapsulation structure 301, so that the external of the phase change working medium 30 is covered by the encapsulation structure 301.

[0157] Optionally, to facilitate the phase change working fluid 30's timely and rapid absorption of the heat generated during the temperature rise of the battery cell 10 before thermal runaway, the encapsulation structure 301 can be a micron-sized thin film with high thermal conductivity. For example, the encapsulation structure 301 can be made of aluminum-plastic film, etc.

[0158] In the above technical solution, by setting an encapsulation structure 301 to encapsulate the gas-liquid phase change working medium, when the sealing plate 203 is used to seal the closed cavity 2012, the encapsulation structure 301 can isolate the gas-liquid phase change working medium and the sealing plate 203, limiting the unstable gas-liquid phase change working medium from touching the connection position between the sealing plate 203 and the closed cavity 2012, thereby reducing the impact on the sealing operation, improving the firmness and sealing between the sealing plate 203 and the closed cavity 2012, and also reducing the probability of the gas-liquid phase change working medium undergoing a phase change caused by heat during the sealing operation.

[0159] Furthermore, the encapsulation structure 301 is a closed shell structure that is adapted to the closed cavity 2012.

[0160] Specifically, the shell-like encapsulation structure 301 being compatible with the closed cavity 2012 means that the outer surface of the encapsulation structure 301 can fit against the inner wall of the closed cavity 2012.

[0161] In the above technical solution, by designing the encapsulation structure 301 as a shell-like structure adapted to the closed cavity 2012, on the one hand, the encapsulation structure 301 can have a larger internal space to hold more phase change working fluid 30; on the other hand, the phase change working fluid 30 built into the encapsulation structure 301 can be closer to the inner wall of the closed cavity 2012. In this way, the heat transferred to the cavity wall of the closed cavity 2012 before the battery cell 10 thermally runs away can be absorbed by the phase change working fluid 30 more quickly, which is conducive to the rapid cooling of the battery cell 10, thereby reducing the risk of the battery cell 10 continuing to thermally run away.

[0162] Furthermore, such as Figure 9 and Figure 10 As shown, the sealing piece 203 abuts against the encapsulation structure 301 on the side facing the closed cavity 2012; or, the sealing piece 203 is fixedly connected to the encapsulation structure 301 on the side facing the closed cavity 2012.

[0163] Optionally, the encapsulation structure 301 and the sealing piece 203 can abut against each other after the encapsulation structure 301 is assembled into the closed cavity 2012, and then the sealing piece 203 is connected to the closed cavity 2012 to complete the sealing operation. At this time, the side of the sealing piece 203 facing the closed cavity 2012 can contact and abut against the end of the encapsulation structure 301 to stabilize the encapsulation structure 301 in the closed cavity 2012.

[0164] Optionally, the encapsulation structure 301 and the sealing piece 203 can be fixedly connected by first thermally fusing the encapsulation structure 301 and the sealing piece 203 together, then placing the encapsulation structure 301 containing the phase change working fluid 30 into the closed cavity 2012, and then connecting the sealing piece 203 to the closed cavity 2012 to complete the sealing operation.

[0165] In the above technical solution, by setting the connection between the sealing plate 203 and the encapsulation structure 301 to be abutting or fixed connection, the encapsulation structure 301 can be stably placed in the encapsulation cavity 2012 after the sealing plate 203 seals the encapsulation cavity 2012, thus limiting the phase change working fluid 30 from shaking in the encapsulation cavity 2012 and improving the stability of the structure.

[0166] It should be understood that, since the gas-liquid phase change working fluid is externally covered by the encapsulation structure 301 and is placed together in the closed cavity 2012, the filling amount of the gas-liquid phase change working fluid is less than the internal volume of the closed cavity 2012.

[0167] In some embodiments, such as Figure 11 As shown, the phase change working medium 30 is a solid-liquid phase change working medium, and a gap L is formed between the end of the phase change working medium 30 near the sealing plate 203 and the sealing plate 203.

[0168] Specifically, a solid-liquid phase change working medium refers to a working medium 30 that is solid at room temperature, and that undergoes a phase change and becomes liquid when it reaches its phase change point. Examples of solid-liquid phase change working media include hydrated salts (calcium chloride hexahydrate, magnesium sulfate heptahydrate, aluminum nitrate nonahydrate), molten salts (potassium nitrate-sodium nitrate mixed salt, sodium carbonate-potassium chloride mixed salt), n-hexadecane, n-octadecane, stearic acid, palmitic acid, etc.

[0169] Optionally, the value of the gap L is at least greater than 2 mm; for example, the value of the gap L can be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 15 mm, 20 mm, etc.

[0170] Meanwhile, considering that an excessively large gap L may affect the filling amount of the phase change working medium 30, reducing the volume of the phase change working medium 30 and decreasing its heat absorption capacity for the battery cell 10 that is about to thermally run away, the upper limit of the gap L should not be too large. It can be adapted to the heat absorption capacity that the phase change working medium 30 can provide before the battery cell 10 thermally runs away.

[0171] It should be understood that the value of the gap L is also related to factors such as the specific connection positions of the phase change working medium 30, the sealing plate 203 and the closed cavity 2012. In practical applications, it can be appropriately adjusted according to relevant factors. The comparison of the embodiments in this application is not limited.

[0172] In the above technical solution, since the phase change working medium 30 is a solid-liquid phase change working medium, the phase change working medium 30 is in a solid state when it is filled into the closed cavity 2012. Based on this, an appropriate gap L is set between the sealing plate 203 and the phase change working medium 30, that is, the end of the phase change working medium 30 is kept at a certain distance from the connection position of the sealing plate 203 and the closed cavity 2012. This ensures that the heat generated when the sealing plate 203 connects to and seals the closed cavity 2012 will not affect the phase change of the phase change working medium 30. This also reduces the impact of the phase change working medium 30 after phase change on the connection effect of the sealing plate 203.

[0173] Furthermore, such as Figure 11 As shown, the cross-sectional shape of the solid-liquid phase change working fluid is consistent with the cross-sectional shape of the closed cavity 2012.

[0174] Specifically, the cross-sectional shape of the solid-liquid phase change working medium refers to the outline of the surface intercepted by a plane perpendicular to the extension direction (length direction) of the solid-liquid phase change working medium placed in the closed cavity 2012.

[0175] Specifically, the cross-sectional shape of the closed cavity 2012 refers to the outline of the surface intercepted by a plane perpendicular to the extension direction (length direction) of the closed cavity 2012.

[0176] In the above technical solution, by setting the cross-sectional shapes of the phase change working medium 30 and the sealed cavity 2012 to be identical, the outer peripheral surface of the solid phase change working medium 30 can be attached to the inner wall of the sealed cavity 2012. Thus, the heat transferred to the cavity wall of the sealed cavity 2012 before the battery cell 10 experiences thermal runaway can be absorbed more quickly by the phase change working medium 30, which is beneficial for the rapid cooling of the battery cell 10, thereby reducing the risk of further thermal runaway. Furthermore, the contact between the outer peripheral surface of the phase change working medium 30 and the inner wall of the sealed cavity 2012 increases the frictional force between them, improving the stability of the phase change working medium 30 within the sealed cavity 2012.

[0177] It should be understood that, in order to reduce the impact of heat on the solid-liquid phase change working fluid during the welding of the sealing piece 203, a gap L is designed between the end of the solid-liquid phase change working fluid near the sealing piece 203 and the sealing piece 203; therefore, the filling amount of the solid-liquid phase change working fluid is less than the internal volume of the sealed cavity 2012. Of course, if the sealing piece 203 uses a low-temperature connection scheme to complete the sealing operation, the filling amount of the solid-liquid phase change working fluid can also be equal to the internal volume of the sealed cavity 2012.

[0178] It should be noted that the solid-liquid phase change working fluid can also be covered with an encapsulation structure 301, and the comparison of the embodiments in this application is not limited.

[0179] refer to Figure 12 and Figure 13 , Figure 12 This is an exploded structural diagram of a second type of heat exchange plate provided according to some embodiments of this application; Figure 13 for Figure 12 A magnified schematic diagram of the local structure of D.

[0180] In some embodiments, such as Figure 12 and Figure 13 As shown, the cavity wall of the closed cavity 2012 is provided with a working fluid injection hole 20121 that can be sealed. The working fluid injection hole 20121 is used to inject liquid phase change working fluid 30 or gas phase phase change working fluid 30 into the closed cavity 2012.

[0181] Specifically, under high temperature or high pressure, the solid-liquid phase change working medium can be made to appear as a liquid phase and the gas-liquid phase change working medium can be made to appear as a gas phase. The liquid phase change working medium 30 or the gas phase phase change working medium 30 under high temperature or high pressure can be injected into the interior of the closed cavity 2012 through the injection port 20121, and the phase change working medium 30 can be solidified or liquefied in the closed cavity 2012 at room temperature or normal pressure.

[0182] Optionally, the working fluid injection hole 20121 can be provided at the end of the heat exchange plate 20 along the length direction of the plate body 201.

[0183] Optionally, the injection hole 20121 can be sealed by adhesive.

[0184] It should be understood that by using the scheme of setting the injection port 20121 on the closed cavity 2012, the encapsulation structure 301 can be eliminated. Therefore, after injecting the phase change working medium 30 into the closed cavity 2012, the filling amount of the phase change working medium 30 can be equal to the internal volume of the closed cavity 2012.

[0185] In the above technical solution, by setting the injection port 20121, the liquid or gas phase change working medium 30 can be directly injected into the closed cavity 2012, which is convenient to operate. Moreover, the injection port 20121 can be sealed by a low-temperature connection method such as adhesive bonding. During the sealing process, the phase change working medium 30 will not undergo a phase change. Therefore, the filling amount of the phase change working medium 30 can be equal to the internal volume of the closed cavity 2012, so that the heat exchange plate 20 has more phase change working medium 30, so that it can absorb more heat during the heating process before the battery cell 10 thermal runaway, further reducing the risk of the battery cell 10 continuing to thermal runaway.

[0186] Furthermore, the closed cavity 2012 is provided with a working fluid injection hole 20121 at the end along the length direction of the plate 201, and the working fluid injection hole 20121 is sealed by a sealing structure.

[0187] In the above technical solution, by setting the injection hole 20121 at the end of the closed cavity 2012 along the length direction of the plate 201, it is easy to process and will not damage the integrity of the plate 201 due to opening a hole on the outer peripheral surface of the plate 201, which is beneficial to improving the structural strength of the plate 201.

[0188] Optionally, the outer periphery of the sealing structure is adapted to the injection port 20121 so that the sealing structure can completely seal the injection port 20121. Further optionally, the connection between the sealing structure and the injection port 20121 can be welding, gluing, snap-fitting, etc.

[0189] Optionally, the sealing structure can be connected to the plate 201, and a portion of the sealing structure is used to seal the injection port 20121 of the closed cavity 2012; wherein, the portion of the sealing structure used to enclose the closed cavity 2012 can serve as the cavity wall of the closed cavity 2012. Further optionally, the connection between the sealing structure and the plate 201 can be welding, adhesive bonding, snap-fitting, etc.

[0190] It should be understood that the sealing structure can be the sealing plate 203 mentioned above. The sealing plate 203 is disposed between the manifold 202 and the plate 201. The sealing plate 203 has a sealing part 2032 on the side facing the plate 201. The sealing part 2032 is adapted to the injection port 20121, and the sealing part 2032 can seal the injection port 20121 of the closed cavity 2012. For the specific structure of the sealing plate 203 and its structural relationship with the manifold 202 and the plate 201, please refer to the implementation method mentioned above, which will not be repeated here.

[0191] It should be noted that if the sealing structure is the sealing plate 203 mentioned above, and the working fluid injection hole 20121 is located on the sealing plate 203 corresponding to the sealing part 2032, then before the working fluid injection hole 20121 is sealed, it can connect the closed cavity 2012 and the current collector 202. With this structural design, even if the working fluid injection hole 20121 is not sealed tightly, the phase change working fluid 30 in the closed cavity 2012 will only flow into the current collector 202 and will not enter the interior of the battery device, thus reducing the impact on the battery device.

[0192] Optionally, an opening may be provided at the end of the enclosed cavity 2012 along the length of the plate 201. The opening of the enclosed cavity 2012 can be closed by a sealing structure, and the injection port 20121 can be provided on the sealing structure. Specifically, the sealing structure can be the sealing plate 203 mentioned above. The sealing part 2032 on the sealing plate 203 is adapted to the opening of the enclosed cavity 2012. The sealing part 2032 can be used to seal the opening, and the injection port 20121 can be sealed with sealant.

[0193] The structural design of using a sealing structure to seal the opening of the closed cavity 2012 and opening a working fluid injection hole 20121 on the sealing structure can increase the filling methods of the phase change working fluid 30. For example, before the sealing structure seals the opening, the phase change working fluid 30 can be filled into the closed cavity 2012 through the opening, and then the sealing structure is used to seal the opening; or, after the sealing structure seals the opening, the phase change working fluid 30 can be filled into the closed cavity 2012 through the working fluid injection hole 20121. Multiple filling methods can be adapted to different forms of phase change working fluid 30, making the heat exchange plate structure of this scheme more versatile.

[0194] In some embodiments, the area of ​​the surface of the heat exchange plate 20 facing the large side 101 of the battery cell 10 is the first area; the plane on which the large side 101 of the battery cell 10 is located is the projection plane, and the area of ​​the orthogonal projection of the enclosed cavity 2012 on the projection plane is the second area.

[0195] The ratio of the second area to the first area is M, where M satisfies: 0.05 ≤ M ≤ 0.8. For example, M can be 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, etc.

[0196] It should be understood that the ratio M of the second area to the first area represents the proportion of the phase change surface in the surface of the heat exchange plate 20 that is in contact with the large side 101 of the battery cell 10. The phase change surface refers to the outer wall surface of the heat exchange plate 20 that is in contact with the large side 101 of the battery cell 10 and is used to form the cavity wall of the closed cavity 2012. By limiting M to be greater than or equal to 0.05, the proportion of the phase change surface is not too small, so as to provide a sufficiently large phase change surface area to suppress the thermal runaway of the battery cell 10. Correspondingly, by limiting M to be less than or equal to 0.8, the proportion of the phase change surface is not too large, so as not to crowd the space of the heat exchange channel 2011 on the heat exchange plate 20 due to an excessively large area of ​​phase change surface. At the same time, an excessively large area of ​​phase change surface may also require filling too much phase change working fluid 30 into it, which is wasteful.

[0197] Optionally, the ratio M of the second area to the first area can satisfy: 0.1 ≤ M ≤ 0.5. For example, M can be 0.1, 0.2, 0.3, 0.4, 0.5, etc.

[0198] In the above technical solution, by setting the range of the ratio of the second area to the first area, the surface of the heat exchange plate 20 that is in contact with the large side 101 of the battery cell 10 can have a phase change surface of appropriate area. The phase change surface on the heat exchange plate 20 is used to transfer the heat released by the battery cell 10 before thermal runaway to the phase change working medium 30 in the closed cavity 2012. The phase change surface of appropriate area helps the phase change working medium 30 to absorb heat quickly, so that the battery cell 10 can cool down quickly, thereby reducing the risk of the battery cell 10 continuing to run away from thermal runaway.

[0199] For ease of description, the thickness direction Z, height direction Y, and length direction X of a battery cell are defined to be perpendicular to each other. Specifically, the thickness direction Z of the battery cell is perpendicular to the large surface side 101 of the battery cell 10, the height direction Y of the battery cell has an electrode post 102, and the length direction X of the battery cell can be consistent with the length direction of the plate 201 of the heat exchange plate 20.

[0200] refer to Figures 14 to 16 As shown, Figure 14 This is a schematic diagram of the internal structure of a third type of heat exchange plate that cooperates with a battery cell, according to some embodiments of this application; Figure 15 This is a schematic diagram of the internal structure of a fourth type of heat exchange plate that cooperates with a battery cell, according to some embodiments of this application; Figure 16 This is a schematic diagram of the internal structure of a fifth type of heat exchange plate that cooperates with a battery cell, according to some embodiments of this application.

[0201] In some embodiments, such as Figure 14 As shown, a terminal post 102 is provided on one side of the battery cell 10 in the height direction; heat exchange channels 2011 and closed cavities 2012 are arranged along the height direction Y of the battery cell, and at least part of the heat exchange channels 2011 is closer to the terminal post 102 than the closed cavities 2012.

[0202] It should be understood that within the same heat exchange plate 20, the number of heat exchange channels 2011 can be one or more, and the number of enclosed cavities 2012 can also be one or more. When there is one heat exchange channel 2011 and one or more enclosed cavities 2012, the heat exchange channel 2011 is closer to the pole 102 than all the enclosed cavities 2012; when there are multiple heat exchange channels 2011 and one or more enclosed cavities 2012, at least some of the heat exchange channels 2011 are closer to the pole 102 than all the enclosed cavities 2012.

[0203] Optionally, the heat exchange channel 2011 and the enclosed cavity 2012 can be respectively extended along the length direction X of the battery cell.

[0204] In the above technical solution, since the area near the terminal post 102 of the battery cell 10 generates a large amount of heat during charging and discharging, by arranging the heat exchange channel 2011 and the enclosed cavity 2012 along the height direction Y of the battery cell and making the heat exchange channel 2011 closer to the terminal post 102, the heat exchange channel 2011 can correspond to the area of ​​the large surface side 101 of the battery cell 10 near the terminal post 102, which is conducive to timely heat exchange of the battery cell 10 and enables the battery cell 10 to maintain a suitable operating temperature. At the same time, the enclosed cavity 2012 can be relatively far away from the area of ​​the large surface side 101 of the battery cell 10 where the heat is large, which can reduce the risk of phase change caused by the normal high temperature on the battery cell 10 accidentally triggering the phase change working medium 30 in the enclosed cavity 2012.

[0205] Furthermore, such as Figure 14 As shown, the heat exchange channel 2011 and the enclosed cavity 2012 are adjacent to each other.

[0206] Specifically, the heat exchange channel 2011 and the enclosed cavity 2012 being adjacent means that one side of the heat exchange channel 2011 in the height direction Y of the battery cell is adjacent to one side of the enclosed cavity 2012 in the height direction Y of the battery cell. However, it should be noted that the heat exchange channel 2011 and the enclosed cavity 2012 are not connected. It should also be noted that when there are multiple heat exchange channels 2011 and multiple enclosed cavities 2012, at least one heat exchange channel 2011 and one enclosed cavity 2012 need to be adjacent to each other.

[0207] Optionally, such as Figure 15 As shown, the heat exchange channel 2011 and the enclosed cavity 2012 are alternately arranged adjacent to each other along the height direction Y of the battery cell.

[0208] In the above technical solution, by arranging the heat exchange channel 2011 and the closed cavity 2012 adjacent to each other, the phase change working medium 30 in the closed cavity 2012 can exchange heat with the heat exchange medium in the heat exchange channel 2011. When the phase change working medium 30 undergoes a phase change, the heat of the phase change working medium 30 can be carried away by the heat exchange medium to reduce the temperature around the battery cell 10, thereby reducing the risk of the battery cell 10 continuing to experience thermal runaway.

[0209] Alternatively, such as Figure 16 As shown, the plate 201 has an isolation cavity 2013 that is not connected to either the heat exchange channel 2011 or the closed cavity 2012. The isolation cavity 2013 is located between the heat exchange channel 2011 and the closed cavity 2012.

[0210] Specifically, the isolation cavity 2013 being disposed between the heat exchange channel 2011 and the enclosed cavity 2012 means that the heat exchange channel 2011, the enclosed cavity 2012, and the isolation cavity 2013 are arranged along the height direction Y of the battery cell, and the heat exchange channel 2011 and the enclosed cavity 2012 are positioned on opposite sides of the isolation cavity 2013 along the height direction Y of the battery cell, thus separating the heat exchange channel 2011 and the enclosed cavity 2012. It should also be noted that when there are multiple heat exchange channels 2011 and multiple enclosed cavities 2012, at least one heat exchange channel 2011 and one enclosed cavity 2012 need to have an isolation cavity 2013 between them.

[0211] Optionally, in the same heat exchange plate 20, there is at least one isolation cavity 2013, and at least one isolation cavity 2013 is disposed between the heat exchange channel 2011 and the closed cavity 2012.

[0212] Optionally, the isolation cavity 2013 can be extended along the length direction X of the battery cell, and the two ends of the isolation cavity 2013 in its extension direction are blocked, so that the isolation cavity 2013 is not connected to the heat exchange channel 2011 and the closed cavity 2012.

[0213] It should be noted that since the heat exchange plate 20 is disposed on the large surface side 101 of the battery cell 10, only a portion of the heat exchange channels 2011 need to be opened on the plate body 201 of the heat exchange plate 20 to meet the heat exchange requirements of the battery cell 10. Based on this, the heat exchange plate 20 in this embodiment can be obtained by improving the original heat exchange plate 20, which can save costs. For example, based on the plate 201 in the heat exchange plate 20 being a harmonica tube, a sealing plate 203 and a manifold 202 are configured at the end of the harmonica tube; a connecting hole 2031 is opened on the sealing plate 203 so that a part of the channel in the harmonica tube can be connected to the manifold 202, and these channels can be used as heat exchange channels 2011 by introducing heat exchange medium; the sealing plate 203 can also block a part of the channel in the harmonica tube, and the channels filled with phase change working medium 30 in these blocked channels can be used as closed cavities 2012, while the channels that are neither introduced with heat exchange medium nor filled with phase change working medium 30 can be used as isolation cavities 2013.

[0214] In the above technical solution, by setting an isolation cavity 2013 between the heat exchange channel 2011 and the closed cavity 2012, the distance between the phase change working medium 30 in the closed cavity 2012 and the heat exchange medium in the heat exchange channel 2011 can be increased, thereby reducing the risk of phase change working medium 30 undergoing phase change due to false triggering by the high-temperature heat exchange medium.

[0215] Of course, the arrangement of the heat exchange channels 2011 and the enclosed cavity 2012 in the same heat exchange plate 20 can also be in other ways. For example, the heat exchange channels 2011 and the enclosed cavity 2012 can also be arranged along the length direction X of the battery cell, and the heat exchange channels 2011 and the enclosed cavity 2012 can extend along the height direction Y of the battery cell, with multiple heat exchange channels 2011 and enclosed cavities 2012 arranged in an alternating manner. The arrangement of the heat exchange channels 2011 and the enclosed cavity 2012 can be matched and set according to design requirements, and the comparison of the embodiments in this application is not limited.

[0216] refer to Figure 3 and Figure 17 , Figure 17 This is a schematic diagram showing the assembly relationship between two adjacent heat exchange plates and the same battery cell according to some embodiments of this application.

[0217] In some embodiments, such as Figure 3 and Figure 17As shown, there are multiple heat exchange plates 20, which are arranged at intervals along a direction perpendicular to the large surface side 101 of the battery cell 10; the plane where the large surface side 101 of the battery cell 10 is located is the projection plane; in two adjacent heat exchange plates 20, the orthographic projection of the closed cavity 2012 on one heat exchange plate 20 on the projection plane does not completely coincide with the orthographic projection of the closed cavity 2012 on the projection plane of the other heat exchange plate 20.

[0218] Specifically, the direction perpendicular to the large surface side 101 of the battery cell 10 refers to the thickness direction Z of the battery cell. The battery cell 10 has two large surface sides 101 arranged opposite each other in its thickness direction. Two adjacent heat exchange plates 20 can clamp the same battery cell 10, and one side of the two heat exchange plates 20 can respectively correspond to the two large surface sides 101 of the battery cell 10.

[0219] The projection surface can be any plane containing a large side 101 of the battery cell 10. The orthographic projections of the enclosed cavities 2012 on the projection surface of two adjacent heat exchange plates 20 do not completely overlap (including partial overlap and complete non-overlap). Specifically, the contact position between the enclosed cavity 2012 in one heat exchange plate 20 and a large side 101 of the battery cell 10 and the contact position between the enclosed cavity 2012 in the other heat exchange plate 20 and another large side 101 of the battery cell 10 do not completely correspond in the thickness direction Z of the battery cell. This allows the same battery cell 10 to have more areas in the direction perpendicular to the thickness direction Z that can correspond to the phase change working fluid 30. In this arrangement, the closed cavities 2012 in two adjacent heat exchange plates 20 are staggered along the thickness direction Z of the battery cell. When thermal runaway is about to occur at any location in the battery cell 10, at least one phase change medium 30 in the heat exchange plate 20 can undergo a phase change first to control the thermal runaway of the battery cell 10.

[0220] In the above technical solution, each heat exchange plate 20 can correspond to a different large surface side 101 of the battery cell 10, and two adjacent heat exchange plates 20 can be attached to different large surface sides 101 of the same battery cell 10. Based on this, since the orthographic projections of the closed cavities 2012 on the projection planes of two adjacent heat exchange plates 20 do not completely overlap, the battery cell 10 can have a wider area corresponding to the phase change working medium 30 in the closed cavity 2012, so that the phase change working medium 30 can be triggered in time during the heating process before the battery cell 10 thermal runaway. This can improve the cooling rate of the battery cell 10, thereby reducing the risk of the battery cell 10 continuing to thermal runaway.

[0221] refer to Figure 18 , Figure 18This is a schematic diagram of the internal structure of a second battery device provided according to some embodiments of this application.

[0222] In some embodiments, such as Figure 18 As shown, the battery device also includes a housing 120, which has an inner cavity; battery cells 10 and heat exchange plates 20 are both disposed in the inner cavity; there are multiple heat exchange plates 20, and the multiple heat exchange plates 20 divide the inner cavity into multiple battery receiving cavities; there are multiple battery cells 10, and the multiple battery cells 10 are disposed in multiple battery receiving cavities; wherein, each battery cell 10 has a heat exchange plate 20 corresponding to its large surface side 101.

[0223] Optionally, multiple heat exchange plates 20 can be arranged at intervals along the thickness direction Z of the battery cell, and the space between two adjacent heat exchange plates 20 forms a battery housing cavity, that is, the battery cell 10 is disposed between two adjacent heat exchange plates 20.

[0224] Optionally, multiple battery cells 10 can be provided between two adjacent heat exchange plates 20, and the larger surface side 101 of the multiple battery cells 10 that is close to the same heat exchange plate 20 can be arranged coplanarly.

[0225] Optionally, a beam 40 is provided on the inner wall of the housing 120 along the thickness direction Z of the battery cell, and a heat insulation pad 50 is provided between the beam 40 and the outermost heat exchange plate 20 located along the thickness direction Z of the battery cell.

[0226] Optionally, each heat exchange plate 20 can be provided with a flow collector 202 at its end along its length direction. The heat exchange channels 2011 in multiple heat exchange plates 20 can be connected by the connection between different flow collectors 202.

[0227] In the above technical solution, by configuring a heat exchange plate 20 for each large surface side 101 of the same battery cell 10, on the one hand, different large surface sides 101 in the same battery cell 10 can exchange heat through the heat exchange medium in the heat exchange plate 20, which can improve the heat exchange efficiency of the battery cell 10; on the other hand, different large surface sides 101 in the same battery cell 10 can absorb the heat during the heating process of the battery cell 10 before thermal runaway through the phase change working medium 30 in the heat exchange plate 20, which can increase the cooling rate of the battery cell 10, thereby reducing the risk of the battery cell 10 continuing to experience thermal runaway.

[0228] like Figures 3 to 18As shown, the battery device provided in this embodiment includes a battery cell 10 and a heat exchange plate 20, with the heat exchange plate 20 disposed on the large surface side 101 of the battery cell 10. The heat exchange plate 20 includes a plate body 201, and the interior of the plate body 201 is provided with a non-communicating heat exchange channel 2011 and a closed cavity 2012. The heat exchange channel 2011 is configured to allow the flow of a heat exchange medium for heat exchange with the large surface side 101 of the battery cell 10. The cavity wall of the closed cavity 2012 facing the battery cell 10 is attached to the large surface side 101 of the battery cell 10, and the closed cavity 2012 is filled with a phase change working fluid 30. In some embodiments, the amount of phase change working fluid 30 is less than or equal to the internal volume of the closed cavity 2012. In some embodiments, the heat exchange plate 20 further includes a collector 202 and a sealing plate 203. The collector 202 is disposed at the end of the plate body 201 along its length direction; the sealing plate 203 is disposed between the collector 202 and the plate body 201, and is configured to connect the heat exchange channel 2011 and the collector 202, and to seal the closed cavity 2012 and prevent the closed cavity 2012 from communicating with the collector 202. In some embodiments, the phase change working fluid 30 is a gas-liquid phase change working fluid, and the phase change working fluid 30 is externally covered by an encapsulation structure 301. Specifically, the gas-liquid phase change working fluid refers to the phase change working fluid 30 being in the liquid phase at room temperature, and when the phase change working fluid 30 reaches its phase change point, the phase change working fluid 30 undergoes a phase change and can be in the gas phase. Further, the encapsulation structure 301 is a closed shell structure adapted to the closed cavity 2012. Further, the sealing plate 203 abuts against the encapsulation structure 301 on the side facing the closed cavity 2012; or, the sealing plate 203 is fixedly connected to the encapsulation structure 301 on the side facing the closed cavity 2012. In some embodiments, the phase change working medium 30 is a solid-liquid phase change working medium, and a gap L is formed between the end of the phase change working medium 30 near the sealing plate 203 and the sealing plate 203. Further, the cross-sectional shape of the solid-liquid phase change working medium is consistent with the cross-sectional shape of the closed cavity 2012. In some embodiments, the cavity wall of the closed cavity 2012 is provided with a working medium injection hole 20121 that can be sealed, and the working medium injection hole 20121 is used to inject the liquid phase change working medium 30 or the gas phase phase change working medium 30 into the closed cavity 2012. In some embodiments, a terminal post 102 is provided on one side of the battery cell 10 in the height direction; a heat exchange channel 2011 and a closed cavity 2012 are arranged along the height direction Y of the battery cell, and the heat exchange channel 2011 is closer to the terminal post 102 than the closed cavity 2012. Further, the heat exchange channel 2011 and the closed cavity 2012 are adjacent to each other. Alternatively, an isolation cavity 2013 is provided inside the plate 201, which is not connected to either the heat exchange channel 2011 or the closed cavity 2012, and the isolation cavity 2013 is disposed between the heat exchange channel 2011 and the closed cavity 2012.In some embodiments, the battery device further includes a housing 120, which has an inner cavity; battery cells 10 and heat exchange plates 20 are both disposed in the inner cavity; there are multiple heat exchange plates 20, and the multiple heat exchange plates 20 divide the inner cavity into multiple battery receiving cavities; there are multiple battery cells 10, and the multiple battery cells 10 are disposed in the multiple battery receiving cavities; wherein, each battery cell 10 has a heat exchange plate 20 corresponding to its large surface side 101. Optionally, the multiple heat exchange plates 20 can be arranged at intervals along the thickness direction Z of the battery cells, and the space between two adjacent heat exchange plates 20 constitutes a battery receiving cavity, that is, the battery cells 10 are disposed between two adjacent heat exchange plates 20. Optionally, multiple battery cells 10 can be disposed between two adjacent heat exchange plates 20, and the large surface side 101 of the multiple battery cells 10 that is close to the same heat exchange plate 20 can be coplanar.

[0229] Secondly, embodiments of this application also provide an electrical device, including a battery device provided in any of the embodiments of the first aspect, the battery device being used to provide electrical energy.

[0230] In the above technical solution, by adopting the battery device in the first aspect, the battery cell 10 in the battery device can be rapidly cooled by the phase change working medium 30 during the heating process before thermal runaway, thereby reducing the risk of the battery cell 10 continuing to undergo thermal runaway, and thus improving the thermal runaway problem of the battery cell 10 in the battery device.

[0231] Thirdly, embodiments of this application also provide an energy storage device, including a battery device provided in any of the embodiments of the first aspect, the battery device being used to store electrical energy.

[0232] In the above technical solution, by adopting the battery device in the first aspect, the energy storage device can enable the battery cell 10 in the battery device to be rapidly cooled by the phase change working medium 30 during the heating process before thermal runaway, thereby reducing the risk of the battery cell 10 continuing to undergo thermal runaway, and thus improving the thermal runaway problem of the battery cell 10 in the battery device.

[0233] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0234] 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. This application is not limited to the specific embodiments applied herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery device comprises: a battery cell; a heat exchange plate arranged on a large surface side of the battery cell; the heat exchange plate comprises: a plate body, inside which a non-communicating heat exchange channel and a closed cavity are arranged; the heat exchange channel is configured to be able to circulate a heat exchange medium for heat exchange with the large surface side of the battery cell; the closed cavity is attached to the large surface side of the battery cell towards a cavity wall of the battery cell, and the closed cavity is filled with a phase change working medium.

2. The battery device according to claim 1, wherein: a filling amount of the phase change working medium is less than or equal to an internal volume of the closed cavity.

3. The battery device according to claim 1, wherein: the heat exchange plate further comprises: a flow collecting member arranged at an end of the plate body in a length direction thereof; a blocking sheet arranged between the flow collecting member and the plate body; a communication hole is arranged on the blocking sheet, and the communication hole is used for communication between the heat exchange channel and the flow collecting member; a blocking portion is arranged on a side of the blocking sheet towards the plate body, and the blocking portion is used for blocking the closed cavity.

4. The battery device according to claim 3, wherein: the phase change working medium is a gas-liquid phase change working medium, and an outer portion of the phase change working medium is covered with an encapsulation structure.

5. The battery device according to claim 4, wherein: the encapsulation structure is a closed shell-shaped structure and is matched with the closed cavity.

6. The battery device according to claim 4, wherein: a side of the blocking sheet towards the closed cavity abuts against the encapsulation structure; or a side of the blocking sheet towards the closed cavity is fixedly connected with the encapsulation structure.

7. The battery device according to claim 3, wherein: the phase change working medium is a solid-liquid phase change working medium, and a gap is formed between an end of the phase change working medium close to the blocking sheet and the blocking sheet.

8. The battery device according to claim 7, wherein: a cross-sectional shape of the phase change working medium is consistent with a cross-sectional shape of the closed cavity.

9. The battery device according to claim 1, wherein: a cavity wall of the closed cavity is provided with an injectable working medium hole capable of being blocked, and the injectable working medium hole is used for injecting a liquid-phase phase change working medium or a gas-phase phase change working medium into the closed cavity.

10. The battery device according to claim 9, wherein: an end of the closed cavity along a length direction of the plate body is provided with the injectable working medium hole, and the injectable working medium hole is blocked by a blocking structure.

11. The battery device according to any one of claims 1-10, wherein: an area of a surface of the heat exchange plate towards a large surface side of the battery cell is a first area; a plane in which the large surface side of the battery cell is located is a projection plane, and an area of a normal projection of the closed cavity on the projection plane is a second area; wherein a ratio of the second area to the first area is M, and the M satisfies: 0.05≤M≤0.

8.

12. The battery device according to any one of claims 1-10, wherein: a pole is arranged on one side of the battery cell in a height direction thereof. The heat exchange channel and the closed cavity are arranged along the height direction of the battery cell, and at least part of the heat exchange channel is closer to the pole than the closed cavity.

13. The battery device of claim 12, wherein, The heat exchange channel and the closed cavity are adjacent.

14. The battery device of claim 12, wherein, The interior of the plate body is provided with an isolation cavity which is not communicated with the heat exchange channel and the closed cavity, and the isolation cavity is arranged between the heat exchange channel and the closed cavity.

15. The battery device of any one of claims 1-10, wherein, The number of the heat exchange plates is multiple, and the multiple heat exchange plates are arranged in a spaced manner along the direction perpendicular to the large surface side of the battery cell; The plane in which the large surface side of the battery cell is located is a projection plane; In the two adjacent heat exchange plates, the orthogonal projection of the closed cavity on the projection plane of one of the heat exchange plates does not completely coincide with the orthogonal projection of the closed cavity on the projection plane of the other heat exchange plate.

16. The battery device of claim 1, wherein, The battery device further comprises: A box body formed with an inner cavity; The battery cell and the heat exchange plate are arranged in the inner cavity; The number of the heat exchange plates is multiple, and the multiple heat exchange plates separate the inner cavity into multiple battery accommodating cavities; The number of the battery cells is multiple, and the multiple battery cells are arranged in the multiple battery accommodating cavities; Each large surface side of the battery cell corresponds to the heat exchange plate.

17. An electrical device, characterized by The battery device as claimed in any one of claims 1-16 is used to provide electric energy.

18. An energy storage device, comprising: The battery device as claimed in any one of claims 1-16 is used to store electric energy.

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