Battery device, energy storage device, energy storage system and charging system

Abstract

The application relates to the technical field of battery-related technologies, and discloses a battery device, an energy storage equipment, an energy storage system and a charging system. The battery device comprises a battery monomer and a heat exchange plate. At least one side of the battery monomer is provided with the heat exchange plate. The heat exchange plate is provided with a refrigerant flow channel. The heat exchange plate exchanges heat with the battery monomer through refrigerant in the refrigerant flow channel. The refrigerant flow channel comprises a first communication port, a second communication port and a plurality of sub-flow channels in fluid communication. The plurality of sub-flow channels are arranged in parallel between the first communication port and the second communication port. The plurality of sub-flow channels have tail flow segments in communication with the second communication port. The tail flow segments are provided with a mixed flow area for enabling the plurality of sub-flow channels to communicate with each other. The heat exchange uniformity of the refrigerant is improved, the uniformity inside the battery device is improved, and the reliability of the battery device is improved.

Description

Technical Field

[0001] This application relates to the field of battery-related technologies, and in particular to a battery device, energy storage device, energy storage system and charging system. Background Technology

[0002] This section provides only background information relevant to this application and is not necessarily prior art.

[0003] With the rising demand for clean energy, battery devices have been widely developed. For example, energy storage devices that include battery units can store electrical energy to address imbalances in power supply and demand, improve energy efficiency, and enhance the stability and reliability of the power grid.

[0004] Improving the reliability of battery devices has always been a key focus in the research and development of battery devices. Utility Model Content

[0005] In view of the above problems, this application provides a battery device, energy storage device, energy storage system and charging system to improve the ease of battery device placement.

[0006] The first aspect of this application discloses a battery device, including a battery cell and a heat exchange plate. The heat exchange plate is disposed on at least one side of the battery cell. The heat exchange plate is provided with a refrigerant flow channel, and the heat exchange plate exchanges heat with the battery cell through the refrigerant in the refrigerant flow channel. The refrigerant flow channel includes a first connecting port, a second connecting port, and a plurality of sub-flow channels in fluid communication. The plurality of sub-flow channels are disposed in parallel between the first connecting port and the second connecting port. The plurality of sub-flow channels have a tail flow section communicating with the second connecting port. The tail flow section is provided with a mixing zone that enables the plurality of sub-flow channels to communicate with each other.

[0007] In the technical solution of this application embodiment, the heat exchange plate exchanges heat with the battery cells through the refrigerant in the refrigerant flow channel, which improves the thermal management capability and efficiency of the battery device; the tail flow section of the multiple sub-flow channels is provided with a mixing zone, which can play a role in mixing and / or turbulence of the refrigerant in the multiple sub-flow channels, reducing the problem of uneven refrigerant distribution or different refrigerant states in each sub-flow channel, improving the heat exchange uniformity of the refrigerant, thereby improving the uniformity inside the battery device and improving the reliability of the battery device.

[0008] In addition, the battery device according to this application may also have the following additional technical features:

[0009] In some embodiments of this application, the ratio of the sum of the flow areas of the plurality of sub-channels to the flow area of ​​the mixing zone is 0.8 to 1.2.

[0010] In some embodiments of this application, the sum of the flow areas of the plurality of sub-channels is equal to the flow area of ​​the mixing zone.

[0011] In some embodiments of this application, along the arrangement direction of the plurality of sub-channels, the distance between the two sidewalls of the two sub-channels that are furthest apart from each other is W1, and the width dimension of the mixing zone is W2, wherein W2 is 0.8 to 1.2 times W1.

[0012] In some embodiments of this application, the mixing zone is provided with a turbulence section, which is connected between two opposite sidewalls of the refrigerant flow channel.

[0013] In some embodiments of this application, multiple flow-disrupting sections are provided, and the multiple flow-disrupting sections are spaced apart along the extension direction of the refrigerant flow channel.

[0014] In some embodiments of this application, the turbulence section includes a plurality of sub-turbulence sections, which are arranged at intervals along the arrangement direction of the plurality of sub-flow channels. Along the extension direction of the refrigerant flow channel, in two adjacent turbulence sections, the sub-turbulence sections of one turbulence section are at least partially offset from the sub-turbulence sections of the other turbulence section.

[0015] In some embodiments of this application, the circumferential direction of the sub-turbulence portion is at least partially set to an arc shape.

[0016] In some embodiments of this application, the heat exchange plate has a cooling state, in which the first connection port supplies refrigerant to flow into the refrigerant channel, and the second connection port supplies refrigerant to flow out of the refrigerant channel.

[0017] In some embodiments of this application, the plurality of sub-channels extend from one end connected to the second communication port toward the first communication port within a predetermined distance range to form the tail flow segment, and the predetermined distance is less than or equal to half of the total extension length of the plurality of sub-channels.

[0018] In some embodiments of this application, the area where the projection of the battery cell on the heat exchange plate is located is a first area;

[0019] The refrigerant flow channel further includes a first branch section and a second branch section. The first connecting port branches through the first branch section to form the plurality of sub-flow channels. The first branch section is located outside the first region. The second connecting port branches through the second branch section to form the plurality of sub-flow channels. The second branch section is located outside the first region.

[0020] In some embodiments of this application, the interval between the diversion position of the first diversion segment and the first region is set to be greater than or equal to 10 mm and less than or equal to 500 mm;

[0021] And / or, the interval W between the diversion position of the second diversion section and the interval of the first region is set to be greater than or equal to 10 mm and less than or equal to 500 mm.

[0022] In some embodiments of this application, the interval between the diversion position of the first diversion segment and the first region is set to be greater than or equal to 10 mm and less than or equal to 300 mm;

[0023] And / or, the interval W3 between the diversion position of the second diversion section and the interval of the first region is set to be greater than or equal to 10 mm and less than or equal to 300 mm.

[0024] In some embodiments of this application, the battery device further includes a first limiting member and a second limiting member, the first limiting member and the second limiting member being disposed at opposite ends of the battery cell along a second direction, and the first limiting member and the second limiting member being respectively abutting against the battery cell;

[0025] Along the second direction, the first diversion section is disposed on the side of the first limiting member away from the second limiting member, or the first diversion section is disposed on the side of the first limiting member away from the second limiting member, and the second diversion section is disposed on the side of the first limiting member away from the second limiting member, or the second diversion section is disposed on the side of the first limiting member away from the second limiting member. The second direction intersects with the first direction, and the first direction is the arrangement direction between the battery cell and the heat exchange plate.

[0026] In some embodiments of this application, the first communication port and the second communication port are spaced apart by a predetermined distance.

[0027] In some embodiments of this application, the first connection port and the second connection port are located at the same end of the heat exchange plate along the second direction. Along the third direction, the first connection port and the second connection port are spaced apart by a predetermined distance. The predetermined distance is greater than or equal to one-third of the size of the heat exchange plate along the third direction and less than the size of the heat exchange plate along the third direction. The first direction, the second direction and the third direction intersect each other. The first direction is the arrangement direction between the battery cell and the heat exchange plate.

[0028] In some embodiments of this application, the predetermined distance is set to be greater than or equal to 30 millimeters.

[0029] In some embodiments of this application, along the third direction, the first connection port and the second connection port are disposed at both ends of the heat exchange plate.

[0030] In some embodiments of this application, the plurality of sub-channels further include a head flow segment and a middle flow segment. The head flow segment, the middle flow segment, and the tail flow segment each include a plurality of sub-channels, and the plurality of sub-channels of the head flow segment, the middle flow segment, and the tail flow segment are connected in a one-to-one correspondence. The first connection port, the head flow segment, the middle flow segment, the tail flow segment, and the second connection port are connected in series. The head flow segment and the tail flow segment are at least partially adjacent and configured to exchange heat with each other.

[0031] In some embodiments of this application, the head process segment includes a first sub-head segment and a second sub-head segment. The first sub-head segment is connected between the first connection port and the second sub-head segment. The second sub-head segment is connected to the middle process segment. The first sub-head segment extends along the third direction. The tail process segment includes a first sub-tail segment. The second sub-head segment and the first sub-tail segment both extend along the second direction. The first sub-tail segment is connected to and communicates with the second connection port. The second sub-head segment and the first sub-tail segment are adjacent to each other and configured to exchange heat. The mixing zone is located in the first sub-tail segment.

[0032] In some embodiments of this application, the middle process segment includes a first middle section, which includes a first sub-middle section, a second sub-middle section, a third sub-middle section, and a fourth sub-middle section arranged in series. The first sub-middle section, the second sub-middle section, the third sub-middle section, and the fourth sub-middle section all extend in the same direction. The fourth sub-middle section and the third sub-middle section are located between the first sub-middle section and the second sub-middle section. The third sub-middle section is adjacent to the second sub-middle section, and the fourth sub-middle section is adjacent to the first sub-middle section. In the same middle process segment, the first sub-middle section is connected in series between the fourth sub-middle section and the head process segment.

[0033] In some embodiments of this application, along the third direction, the second sub-head segment and the first sub-tail segment are both located on one side of the first middle segment, and the first sub-tail segment is located on the side of the first sub-head segment away from the first middle segment, and the first sub-head segment and the first sub-middle segment are arranged adjacent to each other.

[0034] In some embodiments of this application, the middle process segment includes a second middle section, which is located on the other side of the first middle section along the third direction;

[0035] The second middle section includes a fifth sub-middle section and a sixth sub-middle section arranged in series. The fourth sub-middle section, the fifth sub-middle section, the sixth sub-middle section and the tail flow section are connected in series. The fifth sub-middle section and the sixth sub-middle section are both arranged along the second direction. Along the third direction, the sixth sub-middle section is located on the side of the fifth sub-middle section away from the first middle section. The fifth sub-middle section is adjacent to the second sub-middle section.

[0036] In some embodiments of this application, the tail process segment further includes a second sub-tail segment, which extends along the third direction and is connected in series between the sixth sub-middle segment and the first sub-tail segment. Along the second direction, the first middle segment and the second middle segment are located between the second sub-tail segment and the first sub-head segment.

[0037] In some embodiments of this application, there are multiple battery cells, which form multiple battery cell assemblies. Each battery cell assembly includes multiple battery cells arranged along the second direction. The multiple battery cell assemblies include a first battery cell assembly, a second battery cell assembly, a third battery cell assembly, and a fourth battery cell assembly. The first battery cell assembly, the second battery cell assembly, the third battery cell assembly, and the fourth battery cell assembly are arranged along the third direction. The first sub-tail segment and the second sub-head segment correspond to the first battery cell assembly. The first sub-middle segment and the fourth sub-middle segment correspond to the second battery cell assembly. The second sub-middle segment and the third sub-middle segment correspond to the third battery cell assembly. The fifth sub-middle segment and the sixth sub-middle segment correspond to the fourth battery cell assembly.

[0038] In some embodiments of this application, the battery device further includes a first limiting member and a second limiting member. The first limiting member and the second limiting member are disposed at both ends of the battery cell along the second direction, and the first limiting member is located at one end of the battery cell facing the communication port. The first limiting member and the second limiting member are respectively abutted against the battery cell. The first limiting member and the second limiting member extend along the third direction. Along the second direction, a first sub-head segment is spaced apart from the first limiting member and is located on the side of the first limiting member facing the battery cell assembly. Along the second direction, a second sub-tail segment is spaced apart from the second limiting member and is located on the side of the second limiting member facing the battery cell.

[0039] In some embodiments of this application, the heat exchange plate includes a body portion and an interface portion. Along a first direction, the body portion is disposed directly opposite to the battery cell. Along a second direction, the interface portion protrudes relative to the battery cell. The interface portion is provided with a first communication port and a second communication port. Both the body portion and the interface portion are provided with interconnected refrigerant channels. The first direction is the arrangement direction between the battery cell and the heat exchange plate, and the second direction intersects with the first direction.

[0040] In some embodiments of this application, the interface portion includes a first portion and a second portion, the first portion and the second portion are arranged at intervals along a third direction, the first connection port is disposed in the first portion, the second connection port is disposed in the second portion, and the first direction, the second direction and the third direction intersect each other.

[0041] In some embodiments of this application, the battery device further includes a first connector, the communication port is connected to the first connector, the first connector is disposed on the interface portion and is used to connect to a refrigerant pipeline, and along the first direction, the first connector is located on the side of the interface portion facing the battery cell.

[0042] In some embodiments of this application, the battery device further includes a connecting bracket connected to the interface portion, the connecting bracket being used to install a second connector for the refrigerant pipeline to connect with the first connector.

[0043] In some embodiments of this application, along the first direction, the connecting bracket is located on the side of the interface portion facing the battery cell.

[0044] In some embodiments of this application, the heat exchange plate includes a main plate and a heat spreader plate. The main plate is provided with a groove, and the heat spreader plate is disposed on the side of the main plate facing the battery cell and covers the main plate, and cooperates with the groove to form the refrigerant flow channel.

[0045] In some embodiments of this application, the main body plate and / or the heat spreader plate are aluminum plates.

[0046] In some embodiments of this application, the yield strength of the heat exchange plate is greater than 4 MPa.

[0047] In some embodiments of this application, the heat exchange plate is provided with an insulating layer and / or an anti-corrosion layer on the side facing the battery cell, and / or the heat exchange plate is provided with an insulating layer, an anti-corrosion layer and / or a heat insulation layer on the side away from the battery cell.

[0048] In some embodiments of this application, the battery device further includes a housing, the housing having a receiving cavity, the battery cell being disposed in the receiving cavity, and the heat exchange plate being connected to the housing or the heat exchange plate being at least partially configured as a wall of the housing.

[0049] The second aspect of this application provides an energy storage device, including a housing and at least one battery device according to this application or any embodiment thereof. The energy storage device further includes a thermal management component, wherein the battery device is disposed in the housing, and the thermal management component is connected to a refrigerant channel to form a refrigerant circulation loop.

[0050] The energy storage device according to this application has the same beneficial effects as the battery device proposed in this application or any embodiment of this application.

[0051] A third aspect of this application provides an energy storage system, including a power conversion device and the energy storage device described in this application or any embodiment thereof, wherein the power conversion device is used to electrically connect a power generation device and the energy storage device.

[0052] The energy storage system according to this application has the same beneficial effects as the energy storage device proposed in this application or any embodiment of this application.

[0053] A fourth aspect of this application provides a charging system including a charging pile and an energy storage device or energy storage system according to this application or any embodiment thereof, the energy storage device being used to provide electrical energy to the charging pile.

[0054] The charging system according to this application has the same beneficial effects as the energy storage device proposed in this application or any embodiment of this application.

[0055] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0056] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0057] Figure 1 This is a schematic diagram of the structure of an energy storage device proposed in some embodiments of this application;

[0058] Figure 2This is a schematic diagram of the structure of a battery device proposed in some embodiments of this application;

[0059] Figure 3 This is a schematic diagram of the battery cell as proposed in some embodiments of this application;

[0060] Figure 4 This is a schematic diagram of the structure of a battery device proposed in some embodiments of this application;

[0061] Figure 5 for Figure 4 Enlarged view of part C;

[0062] Figure 6 This is a schematic diagram of the battery device proposed in some embodiments of this application;

[0063] Figure 7 This is a partial cross-sectional view of the heat exchange plate of a battery device proposed in some embodiments of this application;

[0064] Figure 8 This is a partial structural diagram of the heat exchange plate and housing proposed in some embodiments of this application;

[0065] Figure 9 for Figure 8 Enlarged view of T1 section;

[0066] Figure 10 This is a partial structural schematic diagram of the heat exchange plate of a battery device proposed in some embodiments of this application;

[0067] Figure 11 for Figure 10 Enlarged view of the T-section;

[0068] Figure 12 This is a partial structural diagram of the heat exchange plate in some embodiments of this application;

[0069] Figure 13 This is a schematic diagram of the structure of an energy storage device proposed in some embodiments of this application;

[0070] Figure 14 for Figure 13 Enlarged view of part B;

[0071] Figure 15 This is a schematic diagram of the split structure of the second distributor of the energy storage device proposed in some embodiments of this application;

[0072] Figure 16 for Figure 15 The diagram shows a cross-sectional view of the second distributor.

[0073] Figure 17 This is a simplified schematic diagram of the system principle for connecting the thermal management component and the refrigerant heat exchange component (heat exchange plate) according to some embodiments of this application;

[0074] Figure 18 Here are schematic diagrams of energy storage systems proposed in some embodiments of this application;

[0075] Figure 19 This is a schematic diagram of a charging system proposed in some embodiments of this application.

[0076] The reference numerals in the detailed embodiments are as follows:

[0077] 1. Energy storage equipment; 2. Energy storage converter; 3. Power generation equipment; 4. Charging piles;

[0078] 10. Battery assembly; 100. Housing; 101. First housing; 102. Second housing; 103. First limiting member; 104. Second limiting member; 105. Frame; 106. Crossbeam;

[0079] 200. Battery cell assembly; 210. Battery cell; 211. Electrode assembly; 212. Housing; 213. Casing; 214. End cap; 215. Tab; 216. Electrode terminal;

[0080] 300. Refrigerant heat exchange assembly; 310. Heat exchange plate; 311. Body section; 312. Interface section; 313. First section; 314. Second section; 315. First connector; 316. Connecting bracket; 317. Main body plate; 3171. Groove; 318. Heat spreader plate; 3191. Insulating powder coating; 3192. Insulating powder coating; 3193. Insulation layer; 320. Refrigerant flow channel; 321. Head flow section; 3211. First sub-head section; 3212. Second sub-head section; 322. Middle flow section; 3221. First middle section; 3222. First sub-middle section; 3223. Second sub-middle section; 3224. Third sub-middle section; 3225. Fourth sub-middle section; 3226. Second middle section; 3227. 3228. Fifth sub-section; 3229. Sixth sub-section; 323. Tail flow section; 3231. First sub-tail section; 3232. Second sub-tail section; 3233. Mixing zone; 3234. Turbulence section; 3235. Sub-turbulence section; 324. First diversion section; 3241. First primary diversion section; 3242. First final diversion section; 325. Second diversion section; 3251. Second primary diversion section; 3252. Second final diversion section; 326. Diversion section; 3261. Primary diversion section; 3262. Final diversion section; 3263. Diversion section; 3264. Straight section; 330. First connecting port; 340. Second connecting port; 350. Connecting port; 351. First detection element; 352. Second detection element;

[0081] 400. Output terminal assembly; 410. Connection port;

[0082] 50. Refrigerant piping; 51. First piping; 52. Second piping; 53. Third piping; 54. Fourth piping; 55. First distributor; 551. First main interface; 552. First branch port; 56. Second distributor; 561. Second main interface; 562. Second branch port; 57. Second connector; 58. Throttling structure;

[0083] 60. Thermal management component; 61. Compressor; 62. Valve body assembly; 621. First port; 622. Second port; 623. Third port; 624. Fourth port; 625. Throttling element; 626. First heat exchanger;

[0084] 71. Storage chamber; 711. Storage chamber body; 712. First opening; 713. Energy storage chamber; 714. Equipment chamber; 715. Bracket;

[0085] 81. Conductive wire harness;

[0086] X, second direction; Y, third direction; Z, first direction. Detailed Implementation

[0087] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0088] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0089] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0090] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0091] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0092] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0093] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0094] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0095] Temperature has a significant impact on the performance of battery devices. Excessively low temperatures can reduce battery activity and may even prevent charging and discharging, while excessively high temperatures pose a risk of thermal runaway. Improving the temperature control capabilities (i.e., thermal management capabilities) of energy storage devices to enhance their reliability has always been a key focus in the research and development of energy storage equipment.

[0096] In some technologies, liquid cooling (water cooling, usually liquid cooling units) or air cooling is used to control the temperature of energy storage equipment. These methods result in high energy consumption during unit operation and have limited temperature control.

[0097] To further improve the thermal management capabilities of energy storage devices and reduce thermal management energy consumption, some studies have proposed using refrigerant for direct cooling of the battery device. This involves providing refrigerant through a heat exchange component, where the refrigerant flows through the refrigerant heat exchange component within the battery device. The refrigerant directly exchanges heat with the individual battery cells within the heat exchange component to regulate the battery device's temperature. This method, by eliminating the liquid cooling system, improves thermal management efficiency and reduces thermal management energy consumption. However, further research has revealed that due to the gas-liquid two-phase state change of the refrigerant during heat exchange, and the difficulty in detecting the refrigerant's state during flow within the heat exchange component, direct refrigerant thermal management of the battery device can easily lead to uneven internal temperature distribution, thus affecting the battery device's performance.

[0098] To alleviate the problem of uneven internal temperature of the battery device caused by direct cooling of the refrigerant, this application proposes a battery device including a battery cell and a heat exchange plate. The heat exchange plate is provided on at least one side of the battery cell, and the heat exchange plate is provided with a refrigerant flow channel. The heat exchange plate exchanges heat with the battery cell through the refrigerant in the refrigerant flow channel. The refrigerant flow channel includes a first connecting port, a second connecting port, and multiple sub-flow channels in fluid communication. The multiple sub-flow channels are arranged in parallel between the first connecting port and the second connecting port. The multiple sub-flow channels have a tail flow section that communicates with the second connecting port. The tail flow section is provided with a mixing zone that enables the multiple sub-flow channels to communicate with each other.

[0099] The heat exchange plate exchanges heat with the battery cells through the refrigerant in the refrigerant flow channel, improving the thermal management capability and efficiency of the battery device. The tail flow section of multiple sub-flow channels is equipped with a mixing zone, which can mix and / or turbulent the refrigerant in multiple sub-flow channels, reducing the problem of uneven refrigerant distribution or inconsistent refrigerant state in each sub-flow channel, improving the heat exchange uniformity of the refrigerant, thereby improving the uniformity inside the battery device and improving the reliability of the battery device.

[0100] During the cooling process of the battery device by the heat exchange plate, the refrigerant can flow into the refrigerant channel from the first connection port and then flow out through the second connection port. By setting up a mixing zone, the possibility of refrigerant overheating in a certain sub-channel can be reduced, and the temperature regulation uniformity of the battery cells by multiple sub-channels in the tail flow section can be improved, thereby improving the temperature uniformity inside the battery device.

[0101] The battery device disclosed in this application can be used in energy storage devices, such as energy storage cabinets and energy storage containers; the battery device disclosed in this application can also be used in electrical equipment, for example, a power system for electrical equipment can be formed using the battery device disclosed in this application.

[0102] The following embodiments mainly illustrate the application of the battery device of this application in energy storage devices.

[0103] Figure 1 This is a schematic diagram of the structure of an energy storage device proposed in some embodiments of this application. The energy storage device 1 in this embodiment includes a housing 71 and a battery device 10, with the battery device 10 disposed inside the housing 71.

[0104] As an example, energy storage device 1 can be an energy storage container, an energy storage cabinet, etc.

[0105] As an example, energy storage device 1 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage power stations can store electrical energy during off-peak hours and provide power to relevant users or equipment during peak hours. Wind power generation systems collect wind energy from wind turbines, convert it into electricity, and store it in energy storage device 1. Solar power generation systems can convert solar energy into electricity, store it in energy storage device 1, and supply it to users as needed. Mobile power systems can supply power to relevant equipment in areas inaccessible by the mains grid, such as remote mountainous areas or isolated wilderness areas. Temporary power supply systems can provide power to users when there is insufficient electricity supply.

[0106] Optionally, a bracket 715 is provided inside the compartment 71, and the battery device 10 is mounted on the bracket 715. The bracket 715 is connected to the compartment 71, and can be an integral structure with the compartment 71, or it can be fixedly connected by bolts or the like.

[0107] For example, the storage unit can be set as a cabinet.

[0108] The shape of the compartment 71 can be set as needed. A first opening 712 can be provided on one side of the compartment 71 along the horizontal direction to facilitate the assembly and maintenance of the battery device 10. An openable door can be provided at the first opening 712, or no door can be provided.

[0109] There can be multiple battery devices 10 inside the compartment 71. Multiple rows of battery devices 10 can be arranged horizontally inside the compartment 71, or a single row of battery devices 10 can be arranged. Each row of battery devices 10 can be stacked from top to bottom on the bracket 715 inside the compartment.

[0110] This embodiment of the energy storage device 1 includes one or more battery clusters to increase the voltage and capacity of the energy storage device 1. A battery cluster may include multiple battery devices 10, which are connected in series via a busbar to increase the voltage of the energy storage device 1. When the energy storage device 1 includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device 1.

[0111] Energy storage device 1 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. Energy storage device 1 can store electrical energy as needed and output it when appropriate. For example, energy storage device 1 can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application embodiment can be any power system that requires the use of energy storage device 1.

[0112] In some embodiments, the energy storage device 1 is an energy storage container or an energy storage cabinet.

[0113] In some embodiments, the energy storage device 1 may include a cabinet and one or more battery clusters, with the battery clusters housed in the cabinet.

[0114] In some embodiments, the energy storage device 1 may include modules such as a thermal management component 60, a main control module, a central control module, a power distribution device, and a fire protection module.

[0115] As an example, the thermal management component 60 may include a direct cooling unit that supplies refrigerant to each battery device 10 via piping for regulating the temperature of the individual battery cells 210.

[0116] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0117] As an example, the central control module can serve as the battery management unit for energy storage device 1, used to monitor and manage it. The central control module can monitor information such as current, voltage, power, state of charge, and temperature of energy storage device 1. For example, it can control the charging and discharging current and voltage of energy storage device 1. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0118] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0119] As an example, the power distribution device can be used to distribute power to the power modules of the energy storage device 1.

[0120] like Figure 2 As shown, Figure 2 The diagram below illustrates the structure of a battery device according to some embodiments of this application. The battery device 10 mentioned in the embodiments of this application may include one or more battery cell assemblies 200 for providing voltage and capacity. The battery cell assembly 200 may include one or more battery cells 210, and the multiple battery cells 210 are connected in series, parallel, or mixed connection through a busbar.

[0121] In some embodiments, the battery cell assembly 200 is typically formed by arranging a plurality of battery cells 210.

[0122] As an example, the battery cell assembly 200 can be a battery module, which is formed by arranging and fixing multiple battery cells 210 together. As an example, the battery module can be formed by bundling multiple battery cells 210 together with cable ties.

[0123] In some embodiments, the battery device 10 may be a battery pack, which includes a housing 100 and one or more battery cell assemblies 200, the battery cell assemblies 200 being housed in the housing 100.

[0124] As an example, the battery cell assembly 200 can be a battery module, which can be housed in the housing 100 by fixing the battery module in the housing 100.

[0125] As an example, the battery cell assembly 200 can also be housed in the housing 100 by directly fixing multiple battery cells 210 to the housing 100.

[0126] As an example, the housing 100 may include a first housing 101 and a second housing 102. The first housing 101 and the second housing 102 are fastened together to form a closed space inside the housing 100 to house the battery cell assembly 200. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 101 may be a top cover or a bottom plate.

[0127] As an example, the housing 100 may include a top cover, a frame 105, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame 105, so that the interior of the housing 100 forms an enclosed space to accommodate the battery cell assembly 200.

[0128] In some embodiments, the housing 100 may be part of the vehicle's chassis structure. For example, a portion of the housing 100 may be at least a portion of the vehicle's floor, or a portion of the housing 100 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0129] In this embodiment of the application, the battery cell 210 can be a secondary battery, which refers to a battery cell 210 that can be used again after being discharged by recharging to activate the active materials.

[0130] The battery cell 210 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 to this.

[0131] like Figure 3 As shown, Figure 3 The diagram below shows a split view of a battery cell according to some embodiments of this application. The battery cell 210 generally includes an electrode assembly 211. The electrode assembly 211 includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrodes. During the charging and discharging process of the battery cell 210, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0132] In some embodiments, the electrode assembly 211 is provided with tabs 215 that can conduct current from the electrode assembly 211. The tabs 215 include a positive tab 215 and a negative tab 215.

[0133] In some implementations, the tab 215 may be connected to an electrode terminal 216, which is electrically connected to the tab 215 to enable the connection of the electrode assembly 211 with an external circuit and the transmission of current. The electrode terminal 216 may be directly connected to the tab 215 or indirectly connected to the tab 215 via a current collector.

[0134] In some embodiments, the battery cell 210 may include a housing 212. The housing 212 may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing 212), or an aluminum-plastic film, etc. In some embodiments, the housing 212 may be a sealed structure or a non-sealed structure. As an example, when the housing 212 is a non-sealed structure, the housing 212 serves to protect the electrode assembly 211, and a sealing bag is also included between the housing 212 and the electrode assembly 211. The sealing bag is used to encapsulate the electrode assembly 211 and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the housing 212 is a sealed structure, it is used to encapsulate the electrode assembly 211 and the electrolyte, etc.

[0135] As an example, the battery cell 210 can be a cylindrical battery cell 210, a prismatic battery cell 210, a pouch battery cell 210, or a battery cell 210 of other shapes. The prismatic battery cell 210 includes a prismatic battery cell 210, a blade-shaped battery cell 210, and a multi-prismatic battery, such as a hexagonal prismatic battery. There are no particular limitations in this application.

[0136] In some embodiments, the housing 212 includes an end cap 214 and a housing 213, the housing 213 having an opening, and the end cap 214 covering the opening. The housing 213 may have one or more openings. The end cap 214 may also have one or more.

[0137] In some embodiments, at least one electrode terminal 216 is provided on the housing 212, and the electrode terminal 216 is electrically connected to the tab 215. The electrode terminal 216 can be directly connected to the tab 215, or it can be indirectly connected to the tab 215 through a current collector. The electrode terminal 216 can be provided on the end cap 214, or it can be provided on the housing 213.

[0138] In some embodiments, a pressure relief mechanism is provided on the housing 212. The pressure relief mechanism is used to release the internal gas of the battery cell 210.

[0139] As an example, the internal pressure or temperature of the battery cell 210 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 210 reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is broken, thereby forming an opening or channel for the internal pressure or temperature to be released. This threshold design varies depending on design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 210.

[0140] As an example, the pressure relief mechanism can be integrally formed with the housing 212.

[0141] As an example, the pressure relief mechanism can also be separately configured and connected to the housing 212.

[0142] The term "actuation" as used in this application refers to the pressure relief mechanism being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 210. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the pressure relief mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism, etc. When the pressure relief mechanism is actuated, the high-temperature, high-pressure substances inside the battery cell 210 are discharged outwards from the actuated portion as waste. This method allows for pressure and temperature relief of the battery cell 210 under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0143] In some embodiments, when the housing 212 is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for discharging gas inside the battery cell 210.

[0144] The emissions from the battery cell 210 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0145] refer to Figure 2 and Figure 3 and combined Figures 4 to 11 As shown, Figure 4 This is a schematic diagram of the structure of the battery device 10 proposed in some embodiments of this application. Figure 5 for Figure 4 Enlarged view of part C, Figure 6 This is a schematic diagram showing the breakdown of the battery device 10 according to some embodiments of this application. Figure 7 This is a partial cross-sectional view of the heat exchange plate 310 of the battery device 10 according to some embodiments of this application. Figure 8 This is a partial structural diagram of the heat exchange plate 310 and the housing 100 proposed in some embodiments of this application; Figure 9 for Figure 8 Enlarged view of T1 section, Figure 10 This is a partial structural schematic diagram of the heat exchange plate 310 of the battery device 10 proposed in some embodiments of this application. Figure 11 for Figure 10The enlarged view of part T shows that this application provides a battery device 10, including a battery cell 210 and a heat exchange plate 310. The heat exchange plate 310 is provided on at least one side of the battery cell 210. The heat exchange plate 310 is provided with a refrigerant channel 320. The heat exchange plate 310 exchanges heat with the battery cell 210 through the refrigerant in the refrigerant channel 320. The refrigerant channel 320 includes a first connecting port 330, a second connecting port 340 and a plurality of sub-channels that are fluidly connected. The plurality of sub-channels are arranged in parallel between the first connecting port 330 and the second connecting port 340. The plurality of sub-channels have a tail flow section 323 that communicates with the second connecting port 340. The tail flow section 323 is provided with a mixing zone 3233 that enables the plurality of sub-channels to communicate with each other.

[0146] The battery cell 210 in the battery device 10 can be one or more.

[0147] The heat exchange plate 310 is a refrigerant heat exchange component 300, which exchanges heat with the battery cell 210 through refrigerant. The heat exchange plate 310 can be directly connected to the unit circulation loop of the heat exchange component. The heat exchange component can be a refrigeration system or a heat pump system. The refrigerant in the unit circulation loop of the heat exchange component can directly supply refrigerant to the heat exchange plate 310 to regulate the temperature of the battery cell 210. Refrigerant, also known as a cooling agent, is a substance that can absorb, transport, and release heat during a refrigeration or heating cycle in a heat pump system or refrigeration system.

[0148] Both the first and second connecting ports 340 are connecting ports 350 located on the heat exchange plate 310, which are structures connecting the refrigerant flow channel 320 of the heat exchange plate 310 to external pipelines. That is, the heat exchange plate 310 has at least two connecting ports 350. Of these at least two connecting ports 350 (hereinafter referred to as multiple connecting ports 350), a portion of the connecting ports 350 serve as inlets for the heat exchange plate 310, allowing refrigerant to flow into the heat exchange plate 310; the other portion of the connecting ports 350 serve as outlets for the heat exchange plate 310, allowing refrigerant to flow out of the heat exchange plate 310. The inlets and outlets of the heat exchange plate 310 can be interchanged as needed.

[0149] Mixing zone 3233 is the area that connects the various sub-channels so that the refrigerants in the multiple sub-channels can mix with each other.

[0150] The flow area of ​​the mixing zone 3233 is basically the same as the flow area of ​​the multiple sub-channels, so as to reduce the impact on the pressure drop of the refrigerant channel 320.

[0151] The tail flow section 323 refers to the area where the refrigerant flow channel 320 connects to the second connection port 340, and it can extend a predetermined length from the end of the sub-flow channel toward the second connection port 340 toward the first connection port 330.

[0152] The heat exchange plate 310 exchanges heat with the battery cell 210 through the refrigerant in the refrigerant flow channel 320, which improves the thermal management capability and efficiency of the battery device 10. The tail flow section 323 of the multiple sub-flow channels is provided with a mixing zone 3233. The mixing zone 3233 can mix and / or turbulent the refrigerant in the multiple sub-flow channels, reduce the problem of uneven refrigerant distribution or different refrigerant states in each sub-flow channel, improve the heat exchange uniformity of the refrigerant, and thus improve the internal uniformity of the battery device 10, thereby improving the reliability of the battery device 10.

[0153] According to some embodiments of this application, optionally, the ratio of the sum of the flow areas of the plurality of sub-channels of the tail flow section 323 to the flow area of ​​the mixing zone 3233 is 0.8 to 1.2.

[0154] The sum of the flow areas of the multiple sub-channels in the tail flow section 323 refers to the sum of the flow areas of the multiple sub-channels located in the tail flow section 323. The flow area of ​​each sub-channel can remain roughly unchanged from the beginning to the end. Therefore, the sum of the flow areas of the multiple sub-channels in the tail flow section 323 can also be roughly understood as the sum of the flow areas of the multiple sub-channels.

[0155] The flow area of ​​the mixing zone 3233 refers to the area of ​​the mixing zone 3233 that can be used for refrigerant flow along the cross section perpendicular to the refrigerant flow direction.

[0156] The ratio of the sum of the flow areas of the multiple sub-channels in the tail flow section 323 to the flow area of ​​the mixing zone 3233 can be 0.8, 0.9, 1.1, or 1.2. Along the refrigerant flow direction, the flow area of ​​the mixing zone 3233 can be the same or slightly different, but all must satisfy the requirement that the ratio of the sum of the flow areas of the multiple sub-channels in the tail flow section 323 to the flow area of ​​the mixing zone 3233 is between 0.8 and 1.2.

[0157] The flow area of ​​the mixing zone 3233 is roughly equivalent to the sum of the flow areas of the multiple sub-channels. This can reduce the large pressure drop of the refrigerant in the tail flow section 323, reduce the possibility of the refrigerant temperature being affected by pressure drop changes, and thus improve the temperature uniformity of the battery device 10.

[0158] According to some embodiments of this application, optionally, the sum of the flow areas of the tail flow segments 323 of the plurality of sub-flow channels is equal to the flow area of ​​the mixing zone 3233.

[0159] It should be noted that the sum of the flow areas of the tail flow sections 323 of the multiple sub-flow channels is equal to the flow area of ​​the mixing zone 3233. Strict equality is not required. Area fluctuations within the allowable range of industrial error are considered equal.

[0160] The flow area of ​​the mixing zone 3233 is equal to the sum of the flow areas of the multiple sub-channels, which can reduce the large pressure drop of the refrigerant in the tail flow section 323, reduce the possibility of the refrigerant temperature being affected by pressure drop changes, and thus improve the temperature uniformity of the battery device 10.

[0161] The tail flow section 323 refers to the area where the refrigerant flow channel 320 connects to the second connection port 340, and it can extend a predetermined length from the end of the sub-flow channel toward the second connection port 340 toward the first connection port 330.

[0162] The heat exchange plate 310 exchanges heat with the battery cell 210 through the refrigerant in the refrigerant flow channel 320, which improves the thermal management capability and efficiency of the battery device 10. The tail flow section 323 of the multiple sub-flow channels is provided with a mixing zone 3233. The mixing zone 3233 can mix and / or turbulent the refrigerant in the multiple sub-flow channels, reduce the problem of uneven refrigerant distribution or different refrigerant states in each sub-flow channel, improve the heat exchange uniformity of the refrigerant, and thus improve the internal uniformity of the battery device 10, thereby improving the reliability of the battery device 10.

[0163] According to some embodiments of this application, optionally, such as Figure 10 and Figure 11 As shown, the mixing zone 3233 is provided with a turbulence section 3234, which is connected between two opposite side walls of the refrigerant flow channel 320.

[0164] The two opposite sidewalls of the refrigerant flow channel 320 can be the main body plate 317 and the heat spreader plate 318, respectively, and the turbulence section 3234 can be connected between the main body plate 317 and the heat spreader plate 318.

[0165] The turbulence section 3234 can be set on the flow path of the refrigerant in the mixing zone 3233 to turbulent the refrigerant, improve the mixing uniformity of the refrigerant, reduce the problem of uneven refrigerant distribution or different refrigerant states in each sub-channel, improve the heat exchange uniformity of the refrigerant, and thus improve the uniformity inside the battery device 10 and improve the reliability of the battery device 10.

[0166] Continue to refer to Figure 10 and Figure 11 As shown, according to some embodiments of this application, optionally, the flow-dispersing section 3234 includes a plurality of sub-flow-dispersing sections 3235, which are arranged at intervals along the arrangement direction of the plurality of sub-flow channels. Along the extension direction of the refrigerant flow channel 320, in two adjacent flow-dispersing sections 3234, the sub-flow-dispersing section 3235 of one flow-dispersing section 3234 is at least partially offset from the sub-flow-dispersing section 3235 of the other flow-dispersing section 3234.

[0167] The extension direction of the refrigerant flow channel 320 can be referenced to the refrigerant flow direction. Multiple sub-blurring sections 3235 of each blurring section 3234 form a channel for refrigerant flow. The areas between adjacent blurring sections 3234 are connected. The refrigerant can mix in the area between two blurring sections 3234, then be blurred by the sub-blurring sections 3235, and flow through the channel between adjacent sub-blurring sections 3235 to the next connected area.

[0168] Each sub-turbulence section 3235 can be connected to two opposite side walls of the refrigerant flow channel 320, such as between the main body plate 317 and the heat spreader plate 318.

[0169] The sub-turbulence section 3235 can be configured as a circular or elliptical shape, or as a strip shape.

[0170] For example, such as Figure 10 and Figure 11 As shown, some of the sub-blurring sections 3234 of the turbulence section 3234 are strip-shaped, while the sub-blurring sections 3235 of the other part of the turbulence section 3234 are roughly circular. The strip-shaped sub-blurring sections 3235 and the strip-shaped sub-blurring sections 3234 can be alternately arranged. This can improve the uniformity of refrigerant mixing, and at the same time, the connection strength of the heat exchange plate 310 can be improved and the pressure resistance performance of the heat exchange plate 310 can be improved by connecting the heat exchange plate 318 and the main plate 317 through the sub-blurring sections 3234 of various shapes.

[0171] One of the turbulence sections 3234 has a sub-turbulence section 3235 that is at least partially offset from the other turbulence section 3234. This allows the refrigerant flowing out from the upstream turbulence section 3234 to be turbulent by the downstream turbulence section 3234, which improves the mixing uniformity of the refrigerant, reduces the problem of uneven refrigerant distribution or inconsistent refrigerant state in each sub-channel, improves the heat exchange uniformity of the refrigerant, and thus improves the uniformity inside the battery device 10 and the reliability of the battery device 10.

[0172] According to some embodiments of this application, optionally, the circumferential portion 3235 is at least partially arc-shaped.

[0173] The sub-turbulence section 3235 can be configured to be approximately circular, elliptical, or a combination of strip and semi-circular shape.

[0174] The sub-turbulence section 3235 is at least partially arc-shaped in the circumferential direction, which helps to improve the smoothness of refrigerant flow and reduces the possibility of excessive pressure drop caused by the refrigerant being interfered with by the sub-turbulence section 3235.

[0175] According to some embodiments of this application, optionally, the heat exchange plate 310 has a cooling state, in which the first connection port 330 supplies refrigerant to flow into the refrigerant channel 320, and the second connection port 340 supplies refrigerant to flow out of the refrigerant channel 320.

[0176] The cooling state of the heat exchange plate 310 means that the heat exchange plate 310 acts as an evaporator, which can absorb the heat of the battery device 10 (battery cell assembly 200) and cool down the battery cell assembly 200.

[0177] In the cooling state, the second connection port 340 is the outlet of the refrigerant flow channel 320, and the first connection port 330 is the inlet of the refrigerant flow channel 320. The refrigerant heat exchange component 300 acts as an evaporator, absorbing the heat from the battery cell 210. Therefore, the refrigerant flowing out of the second connection port 340 is prone to overheating.

[0178] By setting a mixing zone 3233 on the gas phase side of the refrigerant, the refrigerant that may be overheated in the sub-channel can be mixed with the refrigerant in other sub-channels, reducing the problem of poor temperature uniformity of the battery device 10 caused by the heat exchange efficiency drop due to refrigerant overheating, and improving the temperature uniformity of the battery device 10.

[0179] According to some embodiments of this application, optionally, a plurality of sub-channels extend from one end connected to the second communication port 340 to the first communication port 330 within a preset distance range to form a tail flow segment 323, and the preset distance is less than or equal to half of the total extension length of the plurality of sub-channels.

[0180] In other words, the mixing zone 3233 is located on the side close to the second connecting port 340.

[0181] The mixing zone 3233 is located close to the second connection port 340, which can reduce the possibility of large pressure drop changes in the refrigerant due to the mixing zone 3233, and reduce the possibility of the refrigerant temperature being affected by the pressure drop changes, thereby improving the temperature uniformity of the battery device 10.

[0182] According to some embodiments of this application, optionally, such as Figures 8 to 11 As shown, the area where the projection of the battery cell onto the heat exchange plate is located is the first region;

[0183] The refrigerant flow channel also includes a first branch section and a second branch section. The first connecting port branches through the first branch section to form multiple sub-flow channels. The first branch section is located outside the first region. The second connecting port branches through the second branch section to form multiple sub-flow channels. The second branch section is located outside the first region.

[0184] The flow branch section 326 can be understood as the part connecting the connecting port 350 to multiple sub-channels. The heat exchange section is the main part of the refrigerant channel 320, and the area where it is located is the main area for heat exchange between the heat exchange plate 310 and the battery cell 210. The multiple sub-channels of the heat exchange section are arranged in parallel, and the multiple sub-channels can be connected to the same connecting port 350 through the flow branch section 326. The boundary between the flow branch section 326 and the heat exchange section can be the connection point between the flow branch section 326 and the multiple sub-channels, that is, the branching point or the confluence point of the multiple sub-channels.

[0185] A single connection port 350 is branched off by a flow divider section 326 to form multiple sub-channels. This can be understood as multiple sub-connections being connected to the same connection port 350 via the flow divider section 326, or the same connection port 350 being connected to multiple sub-channels via the flow divider section 326. The connection port 350 connected to the flow divider section 326 can be the inlet of the heat exchange plate 310, where refrigerant flows in from the connection port 350 and is then branched off by the flow divider section 326 to multiple parallel sub-channels. The connection port 350 connected to the flow divider section 326 can also serve as the outlet of the heat exchange plate 310, where refrigerant flows from multiple parallel sub-channels into the flow divider section 326 and then into the connection port 350, where it flows out.

[0186] The first region A is a partial area of ​​the heat exchange plate 310. The first region A can be the area corresponding to the orthographic projection of all battery cells 210 in the battery device 10 onto the heat exchange plate 310, that is, the area where the battery cells 210 are directly opposite the heat exchange plate 310. The heat exchange section can be mostly located within the first region A, or it can be entirely located within the first region A. The shunt section 326 is located outside the first region A, that is, along the direction perpendicular to the first direction (refer to the second direction X or the third direction Y), the shunt section 326 is located outside the first region A. The shunt section 326 can be adjacent to and close to the first region A, or it can be spaced apart from the first region A.

[0187] The heat exchange plate 310 exchanges heat with the battery cell 210 through the refrigerant in the refrigerant flow channel 320, improving the thermal management capability and efficiency of the battery device 10. The branch section 326 of the refrigerant flow channel 320 is located outside the area where the battery cell 210 is located (first area A). The refrigerant flow channel 320 can be branched or merged at a position that avoids the battery cell 210. In this way, the pressure drop change of the refrigerant in the refrigerant flow channel 320 in the area where the battery cell 210 is located (first area A) can be reduced, thereby reducing the temperature change of the refrigerant in the refrigerant flow channel 320 corresponding to the battery cell 210. This alleviates the problem of large temperature changes of the refrigerant caused by pressure drop changes, which leads to poor heat exchange uniformity. It improves the temperature uniformity of the battery cell 210 at various locations and improves the thermal management effect.

[0188] According to some embodiments of this application, optionally, the interval between the diversion position of the first diversion section and the first region is set to be greater than or equal to 10 mm and less than or equal to 500 mm; and / or, the interval W between the diversion position of the second diversion section and the interval of the first region is set to be greater than or equal to 10 mm and less than or equal to 500 mm.

[0189] The spacing between the diversion section 326 and the first region A can be understood as the minimum spacing between the diversion position of the diversion section 326 closest to the first region A and the first region A. In the case of a multi-stage diversion section 3263, it can be understood as the minimum spacing between the position where the multiple diversion ports of the final stage diversion section 3262 are connected to the main port and the first region A.

[0190] For example, the distance W between the diversion position of the diversion section 326 and the first region A can be set to 10 mm, 13 mm, 15 mm, 18 mm, 19 mm, 20 mm, 21 mm, 23 mm, 25 mm, 50 mm, 100 mm, 200 mm, 300 mm, 400 mm, or 500 mm.

[0191] The limitation of the spacing dimension W between the shunt section 326 and the first region A ensures that the shunt section 326 is located outside the region where the battery cell 210 is located (first region A), reducing the possibility of rushed shunt distribution and improving the uniformity of refrigerant distribution. At the same time, the refrigerant flow channel 320 is maintained within a reasonable range, reducing the space occupied by the refrigerant heat exchange component 300, increasing the energy density of the battery device 10, reducing the inefficient heat exchange zone of the refrigerant, and reducing the power consumption of the thermal management component 60.

[0192] According to some embodiments of this application, optionally, the interval between the diversion position of the first diversion section and the first region is set to be greater than or equal to 10 mm and less than or equal to 300 mm;

[0193] And / or, the spacing dimension W3 between the diversion position of the second diversion section and the interval of the first region is set to be greater than or equal to 10 mm and less than or equal to 300 mm.

[0194] For example, the distance W between the diversion position of each diversion segment 326 and the first region A can be set from 10 mm to 300 mm.

[0195] According to some embodiments of this application, optionally, the distance W between the diversion position of the diversion section 326 and the first region A is set to 20 mm to 200 mm.

[0196] The limitation of the spacing dimension W between the shunt section 326 and the first region A ensures that the shunt section 326 is located outside the region where the battery cell 210 is located (first region A), reducing the possibility of rushed shunt distribution and improving the uniformity of refrigerant distribution. At the same time, the refrigerant flow channel 320 is maintained within a reasonable range, reducing the space occupied by the refrigerant heat exchange component 300, increasing the energy density of the battery device 10, reducing the inefficient heat exchange zone of the refrigerant, and reducing the power consumption of the thermal management component 60.

[0197] Continue to refer to Figure 8 and Figure 10 As shown, according to some embodiments of this application, optionally, the battery device 10 further includes a first limiting member 103 and a second limiting member 104. The first limiting member 103 and the second limiting member 104 are disposed at opposite ends of the battery cell 210 along the second direction X. The first limiting member 103 and the second limiting member 104 are respectively abutted against the battery cell 210. Along the second direction X, the diversion section 326 is disposed on the side of the first limiting member 103 away from the second limiting member 104 or the diversion section 326 is disposed on the side of the first limiting member 103 away from the second limiting member 104. The second direction X intersects with the first direction, and the first direction Z is the arrangement direction of the battery cell 210 and the heat exchange plate 310.

[0198] For example, the first direction can be the height direction of the battery device 10, and the second direction X can be the length direction of the battery device 10. The length direction of the battery device 10 refers to the direction in which the battery device 10 has a larger dimension, meaning its length dimension is greater than its width dimension.

[0199] The first limiting member 103 and the second limiting member 104 can be a limiting beam (e.g., an expansion beam) or an end plate. The limiting beam or end plate can be part of the box body 100, such as the side wall of the box body 100. The limiting beam or end plate can also be a structural member that is installed inside the box body 100 and connected to the box body 100.

[0200] The structures of the first limiting member 103 and the second limiting member 104 can be the same or different.

[0201] Optionally, the first limiting member 103 and the second limiting member 104 can be connected to the heat exchange plate 310 respectively. For example, the first limiting member 103 and the second limiting member 104 can be in contact with the heat exchange plate 310, for example, by welding, extrusion molding, etc.

[0202] Multiple battery cells 210 can be configured, and multiple battery cells 210 can be arranged in the second direction X to form a battery module. The first limiting member 103 and the second limiting member 104 can be located at both ends of the battery module.

[0203] The first limiting member 103 and the second limiting member 104 can limit the battery cell 210 in the battery device 10 between the first limiting member 103 and the second limiting member 104, so that along the second direction X, the first region A is located between the first limiting member 103 and the second limiting member 104. The diversion section 326 is located either on the side of the first limiting member 103 away from the second limiting member 104 or on the side of the second limiting member 104 away from the first limiting member 103. This allows the diversion section 326 to be located outside the first region A, enabling the refrigerant channel 320 to be diverted or merged before entering the region (first region A) where the battery cell 210 is located. This reduces the refrigerant pressure drop change in the refrigerant channel 320 in the region (first region A) where the battery cell 210 is located, thereby reducing the temperature change of the refrigerant in the refrigerant channel 320 corresponding to the battery cell 210. This alleviates the problem of large refrigerant temperature changes caused by pressure drop changes, which leads to poor heat exchange uniformity. It improves the temperature uniformity of each position of the battery cell 210, improves the thermal management effect, and improves the temperature uniformity of the battery device 10. Meanwhile, the position of the diversion section 326 is more easily confirmed when machining the refrigerant flow channel 320 by using the position of the first limiting member 103 or the second limiting member 104 as a reference, thus improving the ease of machining.

[0204] According to some embodiments of this application, optionally, such as Figure 6 As shown, the first connecting port 330 and the second connecting port 340 are spaced apart by a predetermined distance L1.

[0205] In other words, the inlet and outlet of the refrigerant in the multiple connecting ports 350 are separated by a predetermined distance L1.

[0206] The predetermined distance L1 can be a range, and its design principle is to reduce the mutual influence of refrigerant between the inlet and outlet of heat exchange plate 310. Within the allowable size range of heat exchange plate 310, the predetermined distance L1 can be as large as possible.

[0207] The maximum value of the predetermined distance L1 is less than the maximum size of the heat exchange plate 310, and the minimum value of the predetermined distance L1 can be greater than or equal to one-third of the minimum size of the heat exchange plate 310. For example, the heat exchange plate 310 can be approximately a square plate, and the first connecting port 330 and the second connecting port 340 can be arranged at intervals along the length direction. The maximum value of the predetermined distance L1 is less than the size of the diagonal of the heat exchange plate 310 and greater than or equal to one-third of the width size L2 of the heat exchange plate 310.

[0208] The inlet and outlet of the refrigerant in the multiple connecting ports 350 are separated by a predetermined distance L1, which can reduce the possibility of heat exchange between the refrigerant at the first connecting port 330 and the second connecting port 340, improve the detection accuracy of the refrigerant condition in the refrigerant flow channel 320 in the heat exchange plate 310, and provide a more realistic understanding of the overheating situation inside the heat exchange plate 310. This improves the control accuracy and heat exchange uniformity of the heat exchange plate 310 on the battery device 10, enhances the temperature uniformity of each battery cell assembly 200 or each battery cell 210 in the battery device 10, and improves the reliability of the battery device 10.

[0209] According to some embodiments of this application, optionally, such as Figure 6 As shown, the first connecting port 330 and the second connecting port 340 are located at the same end of the heat exchange plate 310 along the second direction X. Along the third direction Y, the first connecting port 330 and the second connecting port 340 are spaced apart by a predetermined distance L1. The predetermined distance L1 is greater than or equal to one-third of the dimension L2 of the heat exchange plate 310 along the third direction Y, and less than the dimension of the heat exchange plate 310 along the third direction Y. The first direction Z, the second direction X and the third direction Y intersect each other. The first direction Z is the arrangement direction of the battery cell 210 and the heat exchange plate 310.

[0210] The predetermined distance L1 is greater than or equal to 30 mm.

[0211] The study found that when the predetermined distance L1 is set to 30 mm, the possibility of heat exchange between the refrigerant at the first connection port 330 and the second connection port 340 affecting the detection of the refrigerant inlet and outlet status is significantly reduced.

[0212] For example, the value of the predetermined distance can be 30 mm, 50 mm, 80 mm, 100 mm, 120 mm, 150 mm, 180 mm, 200 mm, 250 mm, 300 mm, 350 mm, 400 mm, 500 mm, 600 mm, or 700 mm.

[0213] It should be noted that the setting of the predetermined distance L1 is not limited to the first connection port 330 and the second connection port 340 being set at the same end.

[0214] The first connection port 330 and the second connection port 340 are separated by a predetermined distance L1, which can reduce the possibility of heat exchange between the refrigerant at the first connection port 330 and the second connection port 340, improve the detection accuracy of the refrigerant condition in the refrigerant flow channel 320 inside the heat exchange plate 310, and provide a more realistic understanding of the overheating condition inside the heat exchange plate 310. This improves the control accuracy and heat exchange uniformity of the heat exchange plate 310 on the battery device 10, improves the temperature uniformity of each battery cell assembly 200 or each battery cell 210 in the battery device 10, and improves the reliability of the battery device 10.

[0215] According to some embodiments of this application, optionally, the predetermined distance L1 is greater than or equal to 100 mm.

[0216] The study found that when the predetermined distance L1 is set to 100 mm, the possibility of heat exchange between the refrigerant at the first connection port 330 and the second connection port 340 affecting the detection of the refrigerant inlet and outlet status is further significantly reduced.

[0217] According to some embodiments of this application, optionally, the predetermined distance L1 is greater than or equal to 200 mm.

[0218] The study found that when the predetermined distance L1 is set to 200 mm, the possibility of heat exchange between the refrigerant at the first connection port 330 and the second connection port 340 affecting the detection of the refrigerant inlet and outlet status is further significantly reduced.

[0219] According to some embodiments of this application, optionally, the predetermined distance L1 is greater than or equal to 500 mm.

[0220] The study found that when the predetermined distance L1 is set to 500 mm, the possibility of heat exchange between the refrigerant at the first connection port 330 and the second connection port 340 affecting the detection of the refrigerant inlet and outlet status is further significantly reduced.

[0221] According to some embodiments of this application, optionally, the predetermined distance L1 is greater than or equal to 600 mm.

[0222] The study found that when the predetermined distance L1 is set to 600 mm, the possibility of heat exchange between the refrigerant at the first connection port 330 and the second connection port 340 affecting the detection of the refrigerant inlet and outlet status is further significantly reduced.

[0223] According to some embodiments of this application, optionally, such as Figure 8 and Figure 10 As shown, along the third direction Y, the first connecting port 330 and the second connecting port 340 are disposed at both ends of the heat exchange plate 310.

[0224] Along the third direction Y, the first connection port 330 is located at one end of the heat exchange plate 310, and the second connection port 340 is located at the other end of the heat exchange plate 310 along the third direction Y.

[0225] For example, refer to Figure 4 , Figure 6 , Figure 8As shown, along the third direction Y, the heat exchange plate 310 has a first edge and a second edge arranged oppositely. The first connection port 330 is located on one side of the centerline (referring to centerline B) of the heat exchange plate 310 along the third direction Y, and is located between the first edge and the centerline. Along the third direction Y, the distance between the first connection port 330 and the centerline is greater than the distance between the first connection port 330 and the first edge. That is, the first connection port 330 is located close to or located at the first edge. The second connection port 340 is located on the other side of the centerline (referring to centerline B) of the heat exchange plate 310 along the third direction Y, and is located between the second edge and the centerline. Along the third direction Y, the distance between the second connection port 340 and the centerline is greater than the distance between the second connection port 340 and the second edge. That is, the second connection port 340 is located close to or located at the second edge.

[0226] By having the first connecting port 330 and the second connecting port 340 respectively located at both ends of the heat exchange plate 310 along the third direction Y, the mutual influence of the refrigerant at the inlet and outlet of the heat exchange plate 310 can be reduced, thereby improving the heat exchange uniformity and efficiency of the heat exchange plate 310 for the battery device 10. Simultaneously, by reducing the possibility of mutual heat exchange between the refrigerant at the first connecting port 330 and the second connecting port 340, the overheating situation inside the heat exchange plate 310 can be more accurately understood by detecting the refrigerant state at the first connecting port 330 and the second connecting port 340. This improves the accuracy and uniformity of the heat exchange control of the heat exchange plate 310 for the battery device 10, enhances the temperature uniformity of each battery cell assembly 200 or each battery cell 210 in the battery device 10, and improves the reliability of the battery device 10.

[0227] According to some embodiments of this application, optionally, such as Figure 8 and Figure 10 As shown, according to some embodiments of this application, optionally, the heat exchange section includes a first flow section 321, a middle flow section 322, and a last flow section 323 connected in sequence. The first flow section 321, the middle flow section 322, and the last flow section 323 each include multiple sub-flow channels, and the multiple sub-flow channels of the first flow section 321, the middle flow section 322, and the last flow section 323 are connected one-to-one. The first connection port 330, the first flow section 321, the middle flow section 322, the last flow section 323, and the second connection port 340 are connected in series. The first flow section 321 and the last flow section 323 are at least partially adjacent and configured to exchange heat with each other.

[0228] Unless otherwise specified, the terms "beginning" and "end" used in this embodiment refer to the description of the cooling state.

[0229] The sequential connection of the first flow segment 321, the middle flow segment 322, and the tail flow segment 323 means that, in the refrigerant flow path, the first flow segment 321, the middle flow segment 322, and the tail flow segment 323 are sequentially connected. That is, in the cooling state, the refrigerant flows in from the first connection port 330, then flows through the first flow segment 321, the middle flow segment 322, and the tail flow segment 323, and then flows out from the second connection port 340; in the heating state, the refrigerant flows in from the second connection port 340, then flows through the tail flow segment 323, the middle flow segment 322, and the first flow segment 321, and then flows out from the first connection port 330.

[0230] The fact that the first process segment 321 and the last process segment 323 are at least partially adjacent means that the first process segment 321 and the last process segment 323 are positioned close to each other in terms of their positional relationship.

[0231] The first flow segment 321, the middle flow segment 322, and the last flow segment 323 each include multiple parallel and one-to-one connected sub-flow channels.

[0232] Multiple sub-channels are connected in parallel, and each sub-channel can form a refrigerant flow path. There can be gaps between the multiple sub-channels. The multiple sub-channels together form the head flow section 321, the middle flow section 322, and the tail flow section 323. That is, the multiple sub-channels of the head flow section 321, the middle flow section 322, and the tail flow section 323 are connected one-to-one.

[0233] The sub-channels can be configured as two, three, four, or more, and the extension direction of each sub-channel can be the same. Multiple sub-channels in the head flow section 321, the middle flow section 322, and the tail flow section 323 can be connected and interconnected one-to-one. Setting the refrigerant channel 320 as multiple parallel sub-channels can increase the heat exchange area and reduce the impact of the refrigerant channel 320 on the strength of the heat exchange plate 310, thereby improving the reliability and temperature uniformity of the heat exchange plate 310.

[0234] The study found that if the tail flow section 323 overheats, its heat exchange effect deteriorates (sensible heat exchange, and the temperature rises rapidly), which will lead to a decrease in the heat exchange efficiency of the battery cell 210 corresponding to the tail flow section 323, resulting in poor temperature uniformity among the battery cells 210. In this embodiment of the battery device 10, the refrigerant flow channel 320 is arranged in the heat exchange plate 310 in such a way that the first flow section 321 and the last flow section 323 are adjacent. In this way, even if overheating occurs in the area of ​​the refrigerant flow channel 320 connected to the outlet (cooling state) (i.e., at least part of the area corresponding to the last flow section 323), the battery cells 210 located in the area of ​​the refrigerant flow channel 320 connected to the outlet (cooling state) (i.e., at least part of the area corresponding to the last flow section 323) will still be heat-exchanged by the first flow section 321. The refrigerant in the first flow section 321 has low dryness and strong heat exchange capacity, which can balance the problem of insufficient heat exchange in the last flow section 323, reduce the possibility of excessive temperature difference between individual battery cells 210, and improve the temperature uniformity of individual battery cells 210 in the battery device 10.

[0235] Continue to refer to Figures 6 to 8 As shown, according to some embodiments of this application, optionally, the head process segment 321 includes a first sub-head segment 3211 and a second sub-head segment 3212. The first sub-head segment 3211 is connected between the first connection port 330 and the second sub-head segment 3212. The second sub-head segment 3212 is connected to the middle process segment 322. The first sub-head segment 3211 extends along a third direction Y. The tail process segment 323 includes a first sub-tail segment 3231. The second sub-head segment 3212 and the first sub-tail segment 3231 both extend along a second direction X. The first sub-tail segment 3231 is connected to and communicates with the second connection port 340. The second sub-head segment 3212 and the first sub-tail segment 3231 are adjacent and configured to exchange heat with each other.

[0236] The first sub-segment 3211 is a segment extending from the first connecting port 330 to the second connecting port 340, so that the second sub-segment 3212 can be adjacent to the tail process segment 323.

[0237] The phrase “the first sub-segment 3211 is connected between the first connecting port 330 and the second sub-segment 3212, the second sub-segment 3212 is connected to the middle flow section 322, and the first sub-tail segment 3231 is connected to the second connecting port 340” refers to the fact that the flow paths of the refrigerant are interconnected.

[0238] The second sub-head segment 3212 is adjacent to the first sub-tail segment 3231, meaning that in terms of position, the second sub-head segment 3212 and the first sub-tail segment 3231 are set close to each other.

[0239] For example, refer to 6. Figure 8 and Figure 10As shown, in the third direction Y, the second connecting port 340 is set roughly flush with the first sub-tail segment 3231, and the first sub-head segment 3211 extends from the first connecting port 330 to the direction where the second connecting port 340 is located.

[0240] By setting the first sub-head section 3211, the first connecting port 330 and the second connecting port 340 can be spaced apart in the third direction Y, reducing the mutual influence of the refrigerant state between the first connecting port 330 and the second connecting port 340; at the same time, because the second sub-head section 3212 is adjacent to the first sub-tail section 3231, even if overheating occurs in the refrigerant flow channel 320 area connected to the outlet (cooling state) (i.e., at least part of the area corresponding to the first sub-tail section 3231), the battery cells 210 located in the refrigerant flow channel 320 area connected to the outlet (cooling state) (i.e., at least part of the area corresponding to the first sub-tail section 3231) will also be heat exchanged by the second sub-head section 3212. The refrigerant in the second sub-head section 3212 has low dryness and strong heat exchange capacity, which can balance the problem of insufficient heat exchange in the tail flow section 323, reduce the possibility of excessive temperature difference between individual battery cells 210, and improve the temperature uniformity of individual battery cells 210 in the battery device 10.

[0241] Continue to refer to Figure 6 , Figure 8 , Figure 10 As shown, according to some embodiments of this application, optionally, the middle process segment 322 includes a first middle section 3221. The first middle section 3221 includes a first sub-middle segment 3222, a second sub-middle segment 3223, a third sub-middle segment 3224, and a fourth sub-middle segment 3225 arranged in series. The first sub-middle segment 3222, the second sub-middle segment 3223, the third sub-middle segment 3224, and the fourth sub-middle segment 3225 all extend in the same direction X. The fourth sub-middle segment 3225 and the third sub-middle segment 3224 are located between the first sub-middle segment 3222 and the second sub-middle segment 3223. The third sub-middle segment 3224 is adjacent to the second sub-middle segment 3223, and the fourth sub-middle segment 3225 is adjacent to the first sub-middle segment 3222. In the same middle process segment 322, the first sub-middle segment 3222 is connected in series between the fourth sub-middle segment 3225 and the first process segment 321.

[0242] "Series connection" refers to two components that are connected sequentially along the refrigerant flow path. "Adjacent" unless otherwise specified refers to two components that are located close to each other in terms of their position.

[0243] The middle process segment 322 may include one or more first middle sections 3221. In the case of multiple first middle sections 3221, the multiple first middle sections 3221 are connected in series, wherein, in two first middle sections 3221 that are adjacent in the process, the fourth sub-middle section 3225 of one first middle section 3221 is connected and communicated with the first sub-middle section 3222 of the other second middle section 3226.

[0244] The first sub-section 3222 and the second sub-section 3223 can be connected by a straight pipe extending from the third direction to the Y, or by a pipe segment that is at least partially bent. The second sub-section 3223 and the third sub-section 3224 can be connected by a straight pipe extending from the third direction to the Y, or by a pipe segment that is at least partially bent. The third sub-section 3224 and the fourth sub-section 3225 can be connected by a straight pipe extending from the third direction to the Y, or by a pipe segment that is at least partially bent.

[0245] For example, along the third direction Y, the end of the first sub-segment 3222 away from the first connection port 330 is connected to the end of the second sub-segment 3212 away from the first connection port 330, the end of the first sub-segment 3222 near the first connection port 330 is connected to the second sub-segment 3223, the end of the second sub-segment 3223 away from the first connection port 330 is connected to the third sub-segment 3224, the end of the third sub-segment 3224 near the first connection port 330 is connected to the fourth sub-segment 3225, and the end of the fourth sub-segment 3225 away from the first connection port 330 is used to connect to the next level first sub-segment 3221 or second sub-segment 3226.

[0246] The arrangement of the sub-sections of the first middle section 3221 facilitates the arrangement of the refrigerant flow channel 320 and can improve the heat exchange uniformity of the refrigerant flow channel 320 for each battery cell 210, and improve the temperature uniformity of each battery cell 210.

[0247] Continue to refer to Figures 6 to 8 , Figure 10 As shown, according to some embodiments of this application, optionally, along the third direction Y, the second sub-head segment 3212 and the first sub-tail segment 3231 are located on one side of the first middle segment 3221, and the first sub-tail segment 3231 is located on the side of the first sub-head segment 3211 away from the first middle segment 3221, and the first sub-head segment 3211 and the first sub-middle segment 3222 are arranged adjacent to each other.

[0248] In other words, in terms of positional relationship, along the third direction Y, the second sub-head segment 3212 is located between the first sub-tail segment 3231 and the first sub-middle segment 3222 of the first middle segment 3221.

[0249] The arrangement of the refrigerant flow channel 320 can improve the heat exchange uniformity of each battery cell 210 and improve the temperature uniformity of each battery cell 210.

[0250] Continue to refer to Figures 6 to 8 , Figure 10 As shown, according to some embodiments of this application, optionally, the middle process segment 322 includes a second middle section 3226, which is located on the other side of the first middle section 3221 along the third direction Y. The second middle section 3226 includes a fifth sub-middle section 3227 and a sixth sub-middle section 3228 arranged in series. The fourth sub-middle section 3225, the fifth sub-middle section 3227, the sixth sub-middle section 3228 and the tail process segment 323 are connected in series. The fifth sub-middle section 3227 and the sixth sub-middle section 3228 are both arranged along the second direction X and along the third direction Y. The sixth sub-middle section 3228 is located on the side of the fifth sub-middle section 3227 away from the first middle section 3221. The fifth sub-middle section 3227 is adjacent to the second sub-middle section 3223.

[0251] In other words, in terms of position, the second sub-head segment 3212 and the first sub-tail segment 3231 are located on one side of the first middle segment 3221, and the second middle segment 3226 is located on the other side of the first middle segment 3221.

[0252] In the case of having multiple first middle sections 3221, the second middle section 3226 can be connected in series to the tail of the multiple first middle sections 3221.

[0253] The arrangement of the refrigerant flow channel 320 can improve the heat exchange uniformity of each battery cell 210 and improve the temperature uniformity of each battery cell 210.

[0254] Continue to refer to Figures 6 to 8 , Figure 10 As shown, according to some embodiments of this application, optionally, the tail process segment 323 further includes a second sub-tail segment 3232, which extends along a third direction Y and is connected in series between the sixth sub-middle segment 3228 and the first sub-tail segment 3231. Along the second direction X, the first middle segment 3221 and the second middle segment 3226 are located between the second sub-tail segment 3232 and the first sub-head segment 3211.

[0255] By setting the second sub-tail section 3232, the first connecting port 330 and the second connecting port 340 can be spaced apart in the third direction Y, reducing the mutual influence of the refrigerant state between the first connecting port 330 and the second connecting port 340. The arrangement of the refrigerant flow channel 320 can improve the heat exchange uniformity of each battery cell 210 and improve the temperature uniformity of each battery cell 210.

[0256] Continue to refer to Figures 6 to 8 , Figure 10 As shown, according to some embodiments of this application, optionally, there are multiple battery cells 210, and the multiple battery cells 210 form multiple battery cell assemblies 200. Each battery cell assembly 200 includes multiple battery cells 210 arranged along a second direction X. The multiple battery cell assemblies 200 include a first battery cell assembly, a second battery cell assembly, a third battery cell assembly, and a fourth battery cell assembly. The first battery cell assembly, the second battery cell assembly, the third battery cell assembly, and the fourth battery cell assembly are arranged along a third direction Y. Among them, the first sub-tail segment 3231 and the second sub-head segment 3212 correspond to the first battery cell assembly, the first sub-middle segment 3222 and the fourth sub-middle segment 3225 correspond to the second battery cell assembly, the second sub-middle segment 3223 and the third sub-middle segment 3224 correspond to the third battery cell assembly, and the fifth sub-middle segment 3227 and the sixth sub-middle segment 3228 correspond to the fourth battery cell assembly.

[0257] refer to Figure 8 As shown, each dashed box represents an installation area corresponding to a battery cell assembly 200. Each installation area has a battery cell assembly 200 installed, and different installation areas have different battery cell assemblies 200. Specifically, the first battery cell assembly can be installed in installation area A1, the second battery cell assembly can be installed in installation area A2, the third battery cell assembly can be installed in installation area A3, and the fourth battery cell assembly can be installed in installation area A4.

[0258] Exemplarily, in one specific embodiment, the battery device 10 includes four battery cell assemblies 200, such as... Figure 8 As shown, the heat exchange plate 310 has four installation areas along the third direction Y. The first sub-tail section 3231 and the first sub-head section 3211 are each assigned an installation area. The first sub-middle section 3222 and the fourth sub-middle section 3225 are each assigned an installation area. The second sub-middle section 3223 and the third sub-middle section 3224 are each assigned an installation area. The fifth sub-middle section 3227 and the sixth sub-middle section 3228 are each assigned an installation area. Each installation area is used to install a battery cell assembly 200.

[0259] The correspondence between the refrigerant flow channel 320 and the battery cell assembly 200 can balance the heat exchange efficiency of each battery cell 210 and improve the temperature uniformity of each battery cell 210.

[0260] Continue to refer to Figures 6 to 8As shown, according to some embodiments of this application, optionally, the battery device 10 further includes a first limiting member 103 and a second limiting member 104. The first limiting member 103 and the second limiting member 104 are disposed at both ends of the battery cell 210 along the second direction X, and the first limiting member 103 is located at one end of the battery cell 210 facing the communication port 350. The first limiting member 103 and the second limiting member 104 are respectively abutted against the battery cell 210. The first limiting member 103 and the second limiting member 104 extend along the third direction Y. Along the second direction X, a first sub-head segment 3211 is spaced apart from the first limiting member 103. The first sub-head segment 3211 is located on the side of the first limiting member 103 facing the battery cell assembly 200. Along the second direction X, a second sub-tail segment 3232 is spaced apart from the second limiting member 104. The second sub-tail segment 3232 is located on the side of the second limiting member 104 facing the battery cell 210.

[0261] Along the second direction X, the second limiting member 104 is disposed at one end of the battery cell assembly 200 away from the output electrode assembly 400. The second limiting member 104 is used to abut against the battery cell assembly 200. The second limiting member 104 extends along the third direction Y. Along the second direction X, the second sub-tail segment 3232 is disposed at a distance from the second limiting member 104. The second sub-tail segment 3232 is located on the side of the second limiting member 104 facing the battery cell assembly 200.

[0262] The second sub-tail section 3232 can be set on the side of multiple battery cell modules 200 near the second limiting member 104.

[0263] The second limiting member 104 can be connected to the heat exchange plate 310. Exemplarily, the second limiting member 104 and the heat exchange plate 310 can be in contact connection, for example, they can be configured as an integral structure.

[0264] The study found that near the second limiting member 104, the battery cell assembly 200 is at the edge, and the battery cell 210 at this location is prone to excessive heat exchange. For example, in the cooling state, the battery cell 210 at this location is prone to low temperature. This problem is more likely to occur when the second limiting member 104 is made of metal, which has good thermal conductivity.

[0265] In this embodiment, the battery device 10, by spaced apart from the second sub-tail section 3232 and the second limiting member 104, can reduce the heat exchange capacity between the refrigerant in the refrigerant flow channel 320 (second sub-tail section 3232) and the second limiting member 104, thereby reducing the refrigerant's ability to exchange heat with the battery cell assembly 200 through the second limiting member 104. This reduces the temperature regulation capacity of the battery cell assembly 200 near the second limiting member 104 and matches it with the heat exchange capacity of other positions of the battery cell assembly 200, improving the problem of low or high temperature of the battery cell 210 near the second limiting member 104 and improving the temperature uniformity of the battery cell assembly 200.

[0266] The first limiting member 103 is disposed at one end of the battery cell assembly 200 facing the output electrode assembly 400. The first limiting member 103 is used to abut against the battery cell assembly 200. The first limiting member 103 extends along the third direction Y and along the second direction X. The first sub-head segment 3211 is disposed at a distance from the first limiting member 103. The first sub-head segment 3211 is located on the side of the first limiting member 103 facing the battery cell assembly 200.

[0267] The first limiting member 103 can be connected to the heat exchange plate 310. Exemplarily, the first limiting member 103 and the heat exchange plate 310 can be in contact connection, for example, they can be configured as an integral structure.

[0268] Research has found that near the first limiting member 103, the battery cell assembly 200 is at the edge, and the battery cell 210 at this location is prone to excessive heat exchange. For example, in the cooling state, the battery cell 210 at this location is prone to low temperature. This problem is more likely to occur when the first limiting member 103 is made of metal, as its thermal conductivity is better.

[0269] In this embodiment, the battery device 10, by spaced apart from the first sub-head section 3211 and the first limiting member 103, can reduce the heat exchange capacity between the refrigerant in the refrigerant flow channel 320 (first sub-head section 3211) and the first limiting member 103, thereby reducing the refrigerant's ability to exchange heat with the battery cell assembly 200 through the first limiting member 103. This reduces the temperature regulation capacity of the battery cell assembly 200 near the first limiting member 103 and matches it with the heat exchange capacity of other positions of the battery cell assembly 200, improving the problem of low or high temperature of the battery cell 210 near the first limiting member 103 and improving the temperature uniformity of the battery cell assembly 200.

[0270] According to some embodiments of this application, optionally, such as Figures 6 to 10 As shown, and in combination Figure 11 As shown, Figure 11 for Figure 10The enlarged view of the T section shows that the tail flow section 323 is equipped with a mixing zone 3233 that connects multiple sub-flow channels.

[0271] Multiple mixing zones 3233 can be set between the multiple sub-channels of the first sub-tail section 3231, and the multiple mixing zones 3233 are set at intervals along the extension direction of the first sub-tail section 3231. The multiple sub-channels mix in the mixing zone 3233 and then flow independently.

[0272] The mixing zone 3233 is the area that connects the various sub-channels, allowing the refrigerant in the multiple sub-channels to mix. The flow area of ​​the mixing zone 3233 is approximately equal to the flow area of ​​the multiple sub-channels to reduce the impact on the pressure drop of the refrigerant flow channel 320.

[0273] The mixing zone 3233 can play a role in mixing and / or turbulence, reducing the problem of uneven refrigerant distribution or inconsistent refrigerant state in each sub-channel, and improving the heat exchange uniformity of the refrigerant.

[0274] In some embodiments, where a mixing zone 3233 is provided on the tail flow section 323, in the cooling state, the first connecting port 330 is the inlet of the refrigerant flow channel 320, and the second connecting port 340 is the outlet of the refrigerant flow channel 320. That is, the mixing zone 3233 can be located near the outlet of the refrigerant flow channel 320 to allow multiple sub-channels near the outlet of the refrigerant flow channel 320 to mix. In this way, the mixing zone 3233 can play a role in mixing and / or turbulence, reducing the possibility of overheating (near the tail end) in a certain sub-channel due to uneven flow distribution, improving the heat transfer uniformity of the refrigerant and the accuracy of the refrigerant state detected at the second connecting port 340.

[0275] According to some embodiments of this application, optionally, the ratio of the sum of the flow areas of the plurality of sub-channels of the tail flow section 323 to the flow area of ​​the mixing zone 3233 is 0.8 to 1.2.

[0276] The sum of the flow areas of the multiple sub-channels in the tail flow section 323 refers to the sum of the flow areas of the multiple sub-channels located in the tail flow section 323. The flow area of ​​each sub-channel can remain roughly unchanged from the beginning to the end. Therefore, the sum of the flow areas of the multiple sub-channels in the tail flow section 323 can also be roughly understood as the sum of the flow areas of the multiple sub-channels.

[0277] The flow area of ​​the mixing zone 3233 refers to the area of ​​the mixing zone 3233 that can be used for refrigerant flow along the cross section perpendicular to the refrigerant flow direction.

[0278] The ratio of the sum of the flow areas of the multiple sub-channels in the tail flow section 323 to the flow area of ​​the mixing zone 3233 can be 0.8, 0.9, 1.1, or 1.2. Along the refrigerant flow direction, the flow area of ​​the mixing zone 3233 can be the same or slightly different, but all must satisfy the requirement that the ratio of the sum of the flow areas of the multiple sub-channels in the tail flow section 323 to the flow area of ​​the mixing zone 3233 is between 0.8 and 1.2.

[0279] The flow area of ​​the mixing zone 3233 is roughly equivalent to the sum of the flow areas of the multiple sub-channels. This can reduce the large pressure drop of the refrigerant in the tail flow section 323, reduce the possibility of the refrigerant temperature being affected by pressure drop changes, and thus improve the temperature uniformity of the battery device 10.

[0280] According to some embodiments of this application, optionally, the sum of the flow areas of the tail flow segments 323 of the plurality of sub-flow channels is equal to the flow area of ​​the mixing zone 3233.

[0281] It should be noted that the sum of the flow areas of the tail flow sections 323 of the multiple sub-flow channels is equal to the flow area of ​​the mixing zone 3233. Strict equality is not required. Area fluctuations within the allowable range of industrial error are considered equal.

[0282] The flow area of ​​the mixing zone 3233 is equal to the sum of the flow areas of the multiple sub-channels, which can reduce the large pressure drop of the refrigerant in the tail flow section 323, reduce the possibility of the refrigerant temperature being affected by pressure drop changes, and thus improve the temperature uniformity of the battery device 10.

[0283] According to some embodiments of this application, optionally, reference is made to... Figures 4 to 6 , Figure 8 and Figure 10 As shown, the heat exchange plate 310 includes a body portion 311 and an interface portion 312. Along the first direction, the body portion 311 is positioned directly opposite the battery cell 210. Along the second direction X, the interface portion 312 protrudes relative to the battery cell 210. The interface portion 312 is provided with a first communication port 330 and a second communication port 340. Both the body portion 311 and the interface portion 312 are provided with interconnected refrigerant channels 320.

[0284] Along the first direction Z, the main body 311 is positioned opposite the battery cell assembly 200. Along the second direction X, the interface 312 is located on the side of the battery cell assembly 200 facing the opening (refer to the first opening 712), and the interface 312 protrudes relative to the battery cell assembly 200. The interface 312 is provided with a first communication port 330 and a second communication port 340. The main body 311 and the interface 312 are provided with a connected refrigerant flow channel 320.

[0285] The battery cell assembly 200 is disposed on the body portion 311, and the interface portion 312 protrudes relative to the battery cell assembly 200 and is used to provide a first communication port 330 and a second communication port 340.

[0286] The refrigerant flow channel 320 in the interface section 312 is connected to the first connecting port 330 and the second connecting port 340, and the refrigerant flow channel 320 in the interface section 312 is connected to the refrigerant flow channel 320 in the main body section 311 to form a refrigerant flow path.

[0287] For example, along the second direction X, the interface portion 312 protrudes from the side wall of the housing 100, and the interface portion 312 is exposed on the outside of the housing 100. The first connecting port 330 and the second connecting port 340 are both exposed on the outside of the housing 100.

[0288] For example, the interface portion 312 and the main body portion can be an integral structure, such as by extrusion molding.

[0289] The protruding interface 312 facilitates the connection of the first connecting port 330 and the second connecting port 340 to the corresponding refrigerant pipes 50, thereby improving assembly convenience.

[0290] refer to Figures 4 to 6 , Figure 7 and Figure 10 As shown, according to some embodiments of this application, optionally, the interface portion 312 includes a first portion 313 and a second portion 314, the first portion 313 and the second portion 314 are arranged at intervals along a third direction Y, a first communication port 330 is disposed in the first portion 313, and a second communication port 340 is disposed in the second portion 314.

[0291] The first part 313 and the second part 314 may have the same or different structures. The refrigerant flow channel 320 on the first part 313 is connected to the first connecting port 330 and the refrigerant flow channel 320 on the main body is connected to the refrigerant flow channel 320 on the second part 314. The refrigerant flow channel 320 on the second part 314 is connected to the second connecting port 340 and the refrigerant flow channel 320 on the second part 314 is connected to the refrigerant flow channel 320 on the main body, so as to form a refrigerant flow path in the heat exchange plate 310.

[0292] By setting the first part 313 and the second part 314 at intervals as the positions of the first connection port 330 and the second connection port 340, the heat exchange plate 310 can save consumables, reduce costs, reduce the weight and volume of the interface part 312, increase the energy density of the battery device 10, and also reduce the possibility of heat exchange between the refrigerant in the first connection port 330 and the second connection port 340, thereby improving the accuracy of detecting the refrigerant state in the heat exchange plate 310.

[0293] refer to Figures 4 to 6According to some embodiments of this application, optionally, the battery device 10 further includes a first connector 315, the communication port 350 is connected to the first connector 315, the first connector 315 is disposed on the interface portion 312 and is used to connect to the refrigerant pipeline 50, and along the first direction, the first connector 315 is located on the side of the interface portion 312 facing the battery cell 210.

[0294] The first connector 315 may be provided with a channel for refrigerant flow, which is connected to the first connection port 330 or the second connection port 340. The first connector 315 is used to connect and communicate with the refrigerant pipeline 50, so that the first connection port 330 and the second connection port 340 are connected to the refrigerant pipeline 50.

[0295] For example, the first connector 315 connected to the first communication port 330 is located on the side of the first part 313 facing the battery cell assembly 200, and the first connector 315 connected to the second communication port 340 is located on the side of the second part 314 facing the battery cell assembly 200.

[0296] For example, the first connector 315 may extend along the first direction Z.

[0297] For example, the first connector 315 and the interface portion 312 can be an integral structure, such as being welded together or extruded together.

[0298] In the first direction Z, the first connector 315 is located on the side of the interface 312 facing the battery cell assembly 200, which can facilitate the connection between the first connector 315 and the refrigerant pipeline 50, reduce mutual interference between components, and reduce mutual interference between the first connector 315 and adjacent battery cells 10 when multiple battery cells 10 are stacked along the first direction Z, thus facilitating the stacking and assembly of multiple battery cells 10.

[0299] refer to Figures 4 to 6 According to some embodiments of this application, the battery device 10 may optionally include a connecting bracket 316, which is connected to the interface portion 312 and is used to install a second connector 57 for the refrigerant pipeline 50 to be connected to the first connector 315.

[0300] The first part 313 and its connecting bracket 316 can be connected by welding, integral molding or bolts, etc. The second part 314 and its connecting bracket 316 can be connected by welding, integral molding or bolts, etc.

[0301] The second connector 57 and the connecting bracket 316 can be connected by bolts, screws, etc.

[0302] Studies have found that refrigerant has a higher heat exchange efficiency for battery cell assembly 200 than water cooling, allowing the heat exchange plate 310 to be thinner. However, the pressure of the refrigerant during circulation is greater than in water cooling, thus posing a risk of connection failure between the second connector 57 and the first connector 315 of the refrigerant pipeline 50. This embodiment addresses this by providing a connecting bracket 316, which improves the connection strength between the interface 312 and the second connector 57 of the refrigerant pipeline 50, enhances the connection stability between the second connector 57 and the interface 312, improves the connection stability between the refrigerant pipeline 50 and the heat exchange plate 310, and ultimately enhances the thermal management reliability of the battery device 10.

[0303] According to some embodiments of this application, optionally, such as Figures 4 to 6 As shown, along the first direction, the connecting bracket 316 is located on the side of the interface portion 312 facing the battery cell 210.

[0304] In the first direction Z, the connecting bracket 316 is located on the side of the interface 312 facing the battery cell assembly 200, which can facilitate the arrangement of the second connector 57 and the refrigerant pipe 50, reduce the mutual interference between components, and when multiple battery devices 10 are stacked along the first direction Z, the mutual interference between the second connector 57, the refrigerant pipe 50 and the adjacent battery devices 10 can also be reduced, which facilitates the stacking and assembly of multiple battery devices 10.

[0305] According to some embodiments of this application, optionally, such as Figures 6 to 10 As shown, the heat exchange plate 310 includes a main plate 317 and a heat spreader plate 318. The main plate 317 is provided with a groove 3171. The heat spreader plate 318 is provided on the side of the main plate 317 facing the battery cell 210 and covers the main plate 317. It cooperates with the groove 3171 to form a refrigerant flow channel 320.

[0306] The main body plate 317 is sealed to the heat spreader plate 318. For illustration purposes, the main body plate 317 and the heat spreader plate 318 can be welded together.

[0307] The portion of the main body plate 317 with the groove 3171 protrudes from the side opposite to the heat spreader plate 318. The groove 3171 can be formed in the main body plate 317 by processes such as stamping or extrusion.

[0308] The heat exchange plate 318 can be roughly flat to increase the contact area between the battery cell assembly 200 and the heat exchange plate 310.

[0309] The heat spreader 318 can be made of a plate with good thermal conductivity.

[0310] The refrigerant flow channel 320 of the heat exchange plate 310 is formed by the main body plate 317 with groove 3171 and the heat spreader plate 318, which is easy to process and can increase the heat exchange area between the heat exchange plate 310 and the battery cell assembly 200.

[0311] According to some embodiments of this application, optionally, the main body plate 317 and / or the heat spreader plate 318 are aluminum plates.

[0312] Aluminum sheet refers to a sheet whose main component is aluminum. It can be a pure aluminum sheet, an aluminum alloy sheet, or a coated aluminum sheet, etc.

[0313] Aluminum plates have good plasticity, which facilitates the processing of the refrigerant flow channel 320. At the same time, aluminum plates have good thermal conductivity, which improves heat exchange efficiency.

[0314] According to some embodiments of this application, optionally, the yield strength of the heat exchange plate 310 is greater than 4 MPa.

[0315] The yield strength of heat exchange plate 310 is greater than 4 MPa, which means that the strength of heat exchange plate 310 is sufficient to not yield under a pressure of 4 MPa or greater. In other words, when a pressure of 4 MPa or greater is applied to heat exchange plate 310, heat exchange plate 310 can remain undeformed.

[0316] For example, the strength of both the temperature distribution plate 318 and the main plate 317 is set to be able to withstand pressure greater than or equal to 4 MPa without yielding.

[0317] refer to Figure 12 As shown, Figure 12 The diagram shows a partial structural view of the heat exchange plate 310 in some embodiments of this application. The thickness H1 of the heat spreader 318 can be set to 2 mm to 2.5 mm, the thickness H2 of the main plate 317 can be set to 1.2 mm to 2 mm, the depth H3 of the groove 3171 can be set to 2 mm to 4 mm, and the maximum width H4 of the groove 3171 can be set to 9 mm to 16 mm.

[0318] The yield strength of the heat exchange plate 310 is greater than 4 MPa, which can reduce the possibility of damage to the heat exchange plate 310 caused by refrigerant pressure, reduce the risk of refrigerant leakage, and improve the reliability of the battery device 10.

[0319] According to some embodiments of this application, optionally, such as Figure 7 As shown, the heat exchange plate 310 is provided with an insulating layer and / or an anti-corrosion layer on the side facing the battery cell 210, and / or, the heat exchange plate 310 is provided with an insulating layer, an anti-corrosion layer and / or a heat insulation layer 3193 on the side away from the battery cell 210.

[0320] Optionally, the heat exchange plate 310 has an insulating layer and / or an anti-corrosion layer on the side facing the battery cell assembly 200. The insulating layer and / or anti-corrosion layer can be a single layer structure that has both insulating and anti-corrosion properties, or it can be a two-layer structure. The layer structure can be a component or a coating.

[0321] For example, the heat exchange plate 310 is provided with an insulating powder coating 3191 on the side facing the battery cell assembly 200.

[0322] Optionally, the heat exchange plate 310 has an insulating layer, an anti-corrosion layer, and / or a heat insulation layer 3193 on the side opposite to the battery cell assembly 200. The insulating layer, anti-corrosion layer, and / or heat insulation layer 3193 can be a single-layer structure that simultaneously has insulation, anti-corrosion, and heat insulation properties, or it can be a multi-layer structure. The layer structure can be a component or a coating.

[0323] For example, the heat exchange plate 310 is provided with an insulating spray coating 3192 on the side opposite to the battery cell assembly 200, and a heat insulation layer 3193 is provided on the insulating spray coating 3192.

[0324] The insulation layer 3193 can be formed by spraying a foaming agent.

[0325] For example, in some embodiments, the battery device 10 includes a housing 100, the frame 105 of the housing 100 has a crossbeam 106 in the middle, and the insulation layer 3193 may be provided only on the heat exchange plates 310 on both sides of the crossbeam 106.

[0326] The shapes of the insulation layer 3193 and the insulating spray layer 3192 are matched with the shape of the refrigerant flow channel 320.

[0327] An insulation layer 3193 is provided on the side of the heat exchange plate 310 away from the battery cell assembly 200. This reduces heat loss and the possibility of condensation on the heat exchange plate 310, thereby improving heat exchange efficiency and the reliability of the battery device 10. Both the insulation layer and the anti-corrosion layer can improve the performance of the heat exchange plate 310 and the reliability of the battery device 10.

[0328] According to some embodiments of this application, optionally, such as Figure 2 , Figures 4 to 6 As shown, the battery device 10 also includes a housing 100, which has a receiving cavity. The battery cell 210 is disposed in the receiving cavity, and the heat exchange plate 310 is connected to the housing 100 or the heat exchange plate 310 is at least partially configured as part of the wall of the housing 100.

[0329] In some embodiments, the heat exchange plate 310 is an additional structure provided in the housing 100.

[0330] In some embodiments, the heat exchange plate 310 serves as part of the wall of the housing 100. Exemplarily, the heat exchange plate 310 includes a heat exchange plate 310 that forms the bottom wall of the housing 100.

[0331] Optionally, the output electrode assembly 400 and the heat exchange plate 310 can be disposed on different walls of the housing 100. For example, the output electrode assembly 400 is disposed on the first side wall of the housing 100 in the second direction X, and the heat exchange plate 310 serves as the bottom wall of the housing 100 or is disposed on the bottom wall of the housing 100.

[0332] According to some embodiments of this application, optionally, the battery device 10 further includes a first detection element 351 and a second detection element 352. The first detection element 351 is connected to the first communication port 330 and is used to detect the temperature and / or pressure of the refrigerant flowing through the first communication port 330. The second detection element 352 is connected to the second communication port 340 and is used to detect the temperature and / or pressure of the refrigerant flowing through the second communication port 340.

[0333] The first detection element 351 can be a temperature / pressure sensor, and the second detection element 352 can also be a temperature / pressure sensor. By setting the first detection element 351 and the second detection element 352, the state of the refrigerant at the first connection port 330 and the second connection port 340 can be known, so as to adjust the refrigerant flow and improve the accuracy of thermal management of the battery device 10.

[0334] In this embodiment, the refrigerant in the first connection port 330 and the second connection port 340 of the battery device 10 has little mutual influence. Therefore, the refrigerant status data obtained by the first detection element 351 and the second detection element 352 can better reflect the heat exchange situation in the heat exchange plate 310, thereby improving the accuracy and temperature uniformity of the thermal management of the battery device 10.

[0335] Optionally, the heat exchange plate 310 has at least a cooling state. In the cooling state, the first connection port 330 is the inlet of the refrigerant flow channel 320, and the second connection port 340 is the outlet of the refrigerant flow channel 320. The battery device 10 also includes an output electrode assembly 400. Along the second direction X, the output electrode assembly 400 is disposed on the side of the battery device 10 facing the opening (refer to the first opening 712). Along the third direction Y, the second connection port 340 is disposed closer to the output electrode assembly 400 than the first connection port 330.

[0336] The output terminal assembly 400 is a component that provides conductive connections between the battery device 10 and other battery devices 10 or external circuits. It can be understood as a high-voltage connector for the battery device 10, and can be a high-voltage connection port or a high-voltage plug. The output terminal assembly 400 can be used to realize the charging and discharging of the battery device 10, the series and parallel connection between the individual battery devices 10, and the battery device 10 can output electrical energy to the outside or charge the battery cell assembly 200 through its own output terminal assembly 400.

[0337] The output electrode assembly 400 may include an output electrode and an output electrode base, and the output electrode can be mounted on the housing 100 via the output electrode base. The output electrode of the output electrode assembly 400 may include a positive output electrode and a negative output electrode, and optionally, the positive output electrode and the negative output electrode may each be provided with an output electrode base.

[0338] The cooling state of heat exchange plate 310 refers to its function as an evaporator, absorbing heat from battery device 10 (cell assembly 200) and cooling the cell assembly 200. The heating state of heat exchange plate 310 refers to its function as a condenser, providing heat to battery device 10 (cell assembly 200) and raising the temperature of the cell assembly 200. The switching between the cooling and heating states of heat exchange plate 310 can be achieved through the thermal management component 60.

[0339] It should be noted that when the heat exchange plate 310 is in heating mode, the first connecting port 330 is the outlet of the heat exchange plate 310 in heating mode, and the second connecting port 340 is the inlet of the heat exchange plate 310 in heating mode. That is to say, in heating mode, the refrigerant flows into the refrigerant channel 320 from the second connecting port 340, and flows out from the first connecting port 330 after passing through the refrigerant channel 320.

[0340] The output terminal assembly 400, the first connection port 330, and the second connection port 340 can be located at the same end of the battery device 10 along the second direction X.

[0341] For example, the first connection port 330 and the second connection port 340 may be located on the same side of the output electrode assembly 400 along the third direction Y, and the second connection port 340 is disposed between the first connection port 330 and the output electrode assembly 400, so that the second connection port 340 is disposed closer to the output electrode assembly 400 than the first connection port 330.

[0342] For example, the first connection port 330 and the second connection port 340 may also be respectively disposed on both sides of the output electrode assembly 400 along the third direction Y, wherein the second connection port 340 is disposed closer to the output electrode assembly 400 than the first connection port 330.

[0343] For example, the second connection port 340 may be aligned with the output electrode assembly 400 in the third direction Y, and the first connection port 330 may be spaced apart from the output electrode assembly 400 in the third direction Y, so that the second connection port 340 is closer to the output electrode assembly 400 than the first connection port 330.

[0344] For example, in the first direction Z, the output electrode assembly 400 is spaced apart from the first connection port 330 and the second connection port 340, respectively. For instance, the first connection port 330 and the second connection port 340 may be approximately aligned in the first direction Z, with the output electrode assembly 400 located on one side of the first connection port 330 and the second connection port 340. The first direction Z is relative to the second direction X and the third direction Y.

[0345] Optionally, the battery device 10 further includes a housing 100, a battery cell assembly 200 disposed inside the housing 100, an output electrode assembly 400 disposed at one end of the housing 100 along the second direction X and fixedly connected to the side wall of that end of the housing 100, and the output electrode assembly 400 disposed at a position in the housing 100 that avoids the heat exchange plate 310.

[0346] For example, the heat exchange plate 310 may be part of the enclosure forming the housing 100; for example, the bottom wall of the housing 100 may be configured as the heat exchange plate 310.

[0347] For example, the heat exchange plate 310 may be an additional component provided on the housing 100. For instance, the heat exchange plate 310 may be provided on the inner side of the bottom wall of the housing 100.

[0348] Optionally, such as Figure 4 , Figure 6 As shown, along the third direction Y, the output electrode assembly 400 and the second connection port 340 are located on the same side of the center line B. That is, the output electrode assembly 400 and the second connection port 340 are both located on one side of the center line B, and the first connection port 330 is located on the other side of the center line B.

[0349] The second connection port 340 (outlet in cooling state) and the output electrode assembly 400 are located on the same side, while the first connection port 330 is located away from the output electrode assembly 400. The refrigerant pipes 50 connected to the first connection port 330 and the second connection port 340 can both be introduced from the end away from the output electrode assembly 400. In this way, the mutual influence between the refrigerant pipes 50 and the output electrode assembly 400 can be reduced. Moreover, the arrangement space of the second connection port 340 and the refrigerant pipes 50 is larger, and the refrigerant pipes 50 connected to the second connection port 340 can be bent better, which improves the convenience of component arrangement, reduces the space occupied by the refrigerant pipes 50, and improves space utilization and assembly efficiency.

[0350] Optionally, such as Figure 4 , Figure 12 and Figure 14 As shown, Figure 13 This is a schematic diagram of the structure of an energy storage device proposed in some embodiments of this application. Figure 14 for Figure 13The enlarged view of part B shows that the output electrode assembly 400 has a connection port 410 for connecting to the conductive wire harness 81. Along the third direction Y, the connection port 410 is located between the first connection port 330 and the second connection port 340.

[0351] The connection port 410 is used to connect the conductive wire harness 81. Each battery device 10 can have two connection ports 410, one of which is a positive terminal and the other is a negative terminal. The positive and negative terminals can be aligned in the first direction Z. The conductive wire harness 81 can include wires and an insulating protective layer covering the wires. The conductive wire harness 81 allows the charging and discharging current of the battery device 10 to pass through. The connection ports 410 of two battery devices 10 can be connected through the conductive wire harness 81 to achieve series or parallel connection.

[0352] For example, refer to Figure 4 and Figure 13 As shown, along the third direction Y, the second connection port 340 and the output electrode assembly 400 are located on the same side of the center line B, and the second connection port 340 is located further away from the first connection port 330 than the connection port 410. Specifically, along the third direction Y, the second connection port 340 is located closer to the connection port 410 than the first connection port 330.

[0353] The second connection port 340 is located on the side of the connection port 410 opposite to the first connection port 330. The output pole assembly 400 can have sufficient arrangement space, and the distance between the second connection port 340 and the first connection port 330 can be relatively large. In this way, the arrangement requirements of the output pole assembly 400 can be met, and the arrangement space between the second connection port 340 and the refrigerant pipe 50 in the third direction Y can be large. This allows for better bending of the refrigerant pipe 50 connected to the second connection port 340, improves the convenience of component arrangement, reduces the space occupied by the refrigerant pipe 50, and improves space utilization and assembly efficiency.

[0354] The study found that the arrangement of the heat exchanger plate 310 in the direct cooling / direct heating configuration significantly impacts the convenience and reliability of the piping connections, and even directly affects the space utilization and reliability of the battery device 10. Specifically, the study found that the gaseous phase ratio of the refrigerant in the refrigerant pipe 50 connected to the first connection port 330 is lower than that in the refrigerant pipe 50 connected to the second connection port 340. Therefore, the refrigerant pipe 50 connected to the first connection port 330 can be thinner than the refrigerant pipe 50 connected to the second connection port 340. If the arrangement space for the refrigerant pipe 50 connected to the second connection port 340 is too limited, its greater thickness makes bending difficult, hindering its arrangement. Forced bending may also cause damage at the bend. Increasing the arrangement space will reduce the integration of the battery device 10, and also increase cost and space occupation.

[0355] In this embodiment, the battery device 10, in the cooling state, has a first connection port 330 as the inlet of the refrigerant flow channel 320 and a second connection port 340 as the outlet of the refrigerant flow channel 320. The first connection port 330 and the second connection port 340 are arranged at intervals along the third direction Y, and the first connection port 330 is located further away from the output electrode assembly 400 than the second connection port 340. This facilitates the arrangement of the refrigerant pipeline 50 connecting the first connection port 330 and the second connection port 340, reduces the mutual influence between the output electrode assembly 400 and the refrigerant pipeline 50, and improves assembly efficiency and space utilization. Meanwhile, by setting the second connection port 340 (outlet in cooling state) close to the output electrode assembly 400 and the first connection port 330 far away from the output electrode assembly 400, the refrigerant pipes 50 connected to the first connection port 330 and the second connection port 340 can both be introduced from the end far away from the output electrode assembly 400. In this way, the mutual influence between the refrigerant pipes 50 and the output electrode assembly 400 can be reduced, and the arrangement space of the second connection port 340 and the refrigerant pipes 50 is larger, which allows for better bending of the refrigerant pipes 50 connected to the second connection port 340. This improves the convenience of component arrangement, reduces the space occupied by the refrigerant pipes 50, and improves space utilization and assembly efficiency.

[0356] like Figure 13 and Figure 14 As shown, Figure 13 This is a schematic diagram of the structure of the energy storage device 1 proposed in some embodiments of this application. Figure 14 for Figure 13 The enlarged view of part B shows that this application embodiment also provides an energy storage device 1, including a housing 71 and at least one battery device 10 proposed in this application or any embodiment of this application, wherein the battery device 10 is disposed in the housing 71.

[0357] Multiple battery units 10 can be arranged in rows, with each row comprising multiple battery units 10 arranged along the height direction of the compartment 71 (referring to the first direction Z). In the case of multiple rows, the multiple rows of battery units 10 can be arranged along a third direction Y.

[0358] The energy storage device 1 in this embodiment has the same beneficial effects as the battery device 10 proposed in this application or any embodiment of this application.

[0359] According to some embodiments of this application, optionally, such as Figure 13 and Figure 14 As shown, the compartment 71 includes a compartment body 711, and the compartment body 711 has an opening (defined as the first opening 712 for distinction) on at least one side along the second direction X. A communication port 350 is provided at the end of the battery device 10 facing the opening. The first direction is consistent with the height direction of the compartment 71 and intersects with the second direction X.

[0360] The battery device 10 has an output electrode assembly 400, a first communication port 330, and a second communication port 340 at one end facing the opening (first opening 712). The first opening 712 of the compartment body 711 can be an opening for the battery device 10 to be assembled into the compartment body 71. For example, the battery device 10 can be assembled into the compartment body 71 through the first opening 712 by a push-pull method.

[0361] The output electrode assembly 400, the first connection port 330, and the second connection port 340 are located at the end of the battery device 10 facing the first opening 712, which facilitates the connection and arrangement of the conductive wire harness 81 and the refrigerant pipeline 50 and reduces mutual interference between components.

[0362] Optionally, according to some embodiments of this application, the compartment 71 may also include a compartment door, which is disposed in an opening (first opening 712) in a manner that allows it to be opened and closed.

[0363] like Figure 13 and Figure 14 As shown, optionally, the orientation of the opening (first opening 712) is consistent with the second direction X, and the second direction X and the third direction Y intersect at the height direction of the compartment 71 (i.e., the first direction).

[0364] The second direction X corresponds to the direction in which the battery device 10 is pushed into the compartment 71.

[0365] The directional limitation reflects the positional relationship between the output electrode assembly 400, the first connecting port 330, and the second connecting port 340. This positional limitation improves the ease of assembly of the battery device 10, facilitates the connection and arrangement of the conductive wire harness 81 and the refrigerant pipeline 50, and reduces mutual interference between components.

[0366] Figures 4 to 14 As shown, according to some embodiments of this application, optionally, a portion of the at least two connection ports 350 are first connection ports 330, and the other connection ports 350 are second connection ports 340. One of the first connection port 330 and the second connection port 340 is the inlet of the refrigerant flow channel 320, and the other is the outlet of the refrigerant flow channel 320. The energy storage device 1 also includes a refrigerant pipeline 50, which includes a first pipeline 51 and a second pipeline 52. The first pipeline 51 is connected to and communicates with the first connection port 330, and the second pipeline 52 is connected to and communicates with the second connection port 340. The flow cross-section of the first pipeline 51 is smaller than the flow cross-section of the second pipeline 52.

[0367] The flow cross-section of a pipeline refers to the flow area of ​​the refrigerant in the pipeline, which can be understood as the cross-sectional area of ​​the inner circumference of the pipeline.

[0368] Optionally, the wall thickness of the first pipe 51 and the second pipe 52 is approximately the same. The outer diameter of the first pipe 51 is smaller than the outer diameter of the second pipe 52.

[0369] Since the mass flow rate remains constant during evaporation, the more it evaporates, the higher the proportion of gas becomes, and the larger the volume gradually becomes. Therefore, the gas phase ratio of the refrigerant in the first pipe 51 connected by the first connection port 330 is lower than that of the refrigerant in the second pipe 52 connected by the second connection port 340. The volume of the refrigerant in the second pipe 52 will be larger than that in the first pipe 51. Setting the flow cross-section of the second pipe 52 to be larger can improve the smoothness of the refrigerant flow and reduce the possibility of damage to the pipe due to excessive refrigerant pressure.

[0370] Due to manufacturing processes, the bending radius of the pipe is positively correlated with the pipe diameter (the flow cross-section reflects the pipe diameter). A larger pipe diameter results in higher strength but also makes bending more difficult and reduces tolerance tolerance. Therefore, for ease of installation, the refrigeration inlet (i.e., the first connection port 330) of the heat exchange plate 310 is designed far from the output electrode assembly 400, with a shorter pipe section that is easier to bend, thus reducing assembly difficulty. The second connection port 340 (the outlet in the refrigeration state) is positioned close to the output electrode assembly 400. The second pipe 52 connected to the second connection port 340 has ample space for arrangement, allowing for better bending and improving component layout convenience. It also reduces the space occupied by the refrigerant pipe 50, improving space utilization and assembly efficiency.

[0371] Optionally, along the third direction Y, the first conduit 51 is located on the side of the first connection port 330 away from the output pole assembly 400, and the second conduit 52 is located on the side of the second connection port 340 facing the first connection port 330.

[0372] In other words, in the third direction Y, both the first conduit 51 and the second conduit 52 extend from the side away from the output pole assembly 400 toward the first connection port 330 and the second connection port 340.

[0373] For example, such as Figure 13 and Figure 14 As shown, the output terminal assembly 400 is arranged on the left side of the battery device 10, the first connection port 330 is arranged on the left side of the battery device 10, the second connection port 340 is arranged on the right side of the battery device 10, the first conduit 51 extends from the right side of the battery device 10 to the first connection port 330, and the second conduit 52 extends from the right side of the battery device 10, passes through the first connection port 330, and then extends to the second connection port 340.

[0374] By setting the second connection port 340 (outlet in cooling state) close to the output electrode assembly 400 and the first connection port 330 far away from the output electrode assembly 400, the refrigerant pipes 50 connected to the first connection port 330 and the second connection port 340 can both be introduced from the end far away from the output electrode assembly 400. In this way, the mutual influence between the refrigerant pipes 50 and the output electrode assembly 400 can be reduced. Moreover, the arrangement space of the second connection port 340 and the refrigerant pipes 50 is larger, and the refrigerant pipes 50 connected to the second connection port 340 can be bent better, which improves the convenience of component arrangement, reduces the space occupied by the refrigerant pipes 50, and improves space utilization and assembly efficiency.

[0375] refer to Figure 13 and Figure 14 As shown, according to some embodiments of this application, optionally, the refrigerant pipeline 50 further includes a first distributor 55, a second distributor 56, a third pipeline 53, and a fourth pipeline 54; the first distributor 55 has a first main interface 551 and a plurality of first branch ports 552, the first main interface 551 is connected to and communicates with the third pipeline 53, and the plurality of first branch ports 552 are connected to and communicate with the first pipelines 51 of the plurality of battery devices 10 in a one-to-one correspondence; the second distributor 56 has a second main interface 561 and a plurality of second branch ports 562, the second main interface 561 is connected to and communicates with the fourth pipeline 54, and the plurality of second branch ports 562 are connected to and communicate with the second pipelines 52 of the plurality of battery devices 10 in a one-to-one correspondence.

[0376] The first distributor 55 is used to connect the first conduit 51 and the third conduit 53 of the plurality of battery devices 10, and the second distributor 56 is used to connect the second conduit 52 and the fourth conduit 54 of the plurality of battery devices 10.

[0377] By setting up the first distributor 55 and the second distributor 56, the refrigerant lines 50 (first line 51 and second line 52) of multiple battery devices 10 can be connected and interconnected through a main pipe (third line 53 and fourth line 54), which improves the convenience of pipeline layout.

[0378] refer to Figure 13 and Figure 14 As shown, according to some embodiments of this application, optionally, the battery device 10 further includes an output electrode assembly 400, which is located at one end of the battery device 10 facing the opening and on one side of the battery device 10 along the third direction Y. Along the third direction Y, the first distributor 55, the second distributor 56, the third conduit 53 and the fourth conduit 54 are all located on the other side of the battery device 10, and the first direction, the second direction X and the third direction Y intersect each other.

[0379] The refrigerant line 50 is mainly concentrated on the side of the battery device 10 away from the output electrode assembly 400, which reduces the possibility of mutual interference between the refrigerant line 50 and the output electrode assembly 400, improves the convenience of wiring, and can also reduce the impact of condensate from the refrigerant line 50 on the output electrode assembly 400, thereby improving the reliability of the energy storage device 1.

[0380] refer to Figure 13 and Figure 14 As shown, according to some embodiments of this application, optionally, the compartment 71 has at least one row of battery devices 10 arranged along the height direction of the compartment 71. Along the height direction of the compartment 71, the output electrode assemblies 400 of adjacent battery devices 10 are connected by conductive wire harnesses 81. Along the third direction Y, the conductive wire harnesses 81 are disposed on the side of the battery device 10 away from the refrigerant pipeline 50.

[0381] The conductive wire harness 81 and the refrigerant pipe 50 are located on opposite sides of the battery device 10, which reduces the possibility of interference between the refrigerant pipe 50 and the conductive wire harness 81, improves the convenience of wiring, and also reduces the impact of condensate from the refrigerant pipe 50 on the conductive wire harness 81, thereby improving the reliability of the energy storage device 1.

[0382] According to some embodiments of this application, optionally, such as Figure 13 and Figure 14 As shown, the first connecting port 330 and / or the second connecting port 340 are connected to a throttling structure 58. The throttling structure can be a capillary tube, a throttling ring, a constricting tube, etc.

[0383] In one implementation, the throttling structure 58 can adjust the pressure drop balance of each refrigerant heat exchange component 300 by adjusting the difference in flow resistance. In another implementation, the throttling structure 58 can increase the system flow resistance, reduce the proportion of the pressure drop of each refrigerant heat exchange component 300 in the system pressure drop, thereby reducing the proportion of the pressure drop difference of each refrigerant heat exchange component 300 in the system pressure drop, and making the pressure drop of each refrigerant heat exchange component 300 in the flow path tend to be balanced.

[0384] For example, a capillary tube is provided between each first branch port 552 and the corresponding first conduit 51 of the battery device 10, and the capillary tube serves as a throttling structure 58. A capillary tube is provided between each second branch port 562 and the corresponding second conduit 52 of the battery device 10, and the capillary tube serves as a throttling structure 58.

[0385] Optionally, a capillary tube is provided between each first branch port 552 and the corresponding first pipe 51 of the battery device 10, and the capillary tube serves as a throttling structure 58. The capillary tube can increase the flow resistance of the corresponding flow path, thereby balancing the pressure drop of the first pipe 51 of each battery device 10, making the pressure drop of the refrigerant in the first pipe 51 of each battery device 10 tend to be consistent, thereby improving the temperature uniformity among the battery devices 10.

[0386] Optionally, a capillary tube is provided between each second branch port 562 and the corresponding second pipe 52 of the battery device 10, and the capillary tube serves as a throttling structure 58. The capillary tube can increase the flow resistance of the corresponding flow path, thereby balancing the pressure drop of the second pipe 52 of each battery device 10, making the pressure drop of the refrigerant in the second pipe 52 of each battery device 10 tend to be consistent, thereby improving the temperature uniformity among the battery devices 10.

[0387] like Figure 15 and Figure 16 As shown, Figure 15 This is a schematic diagram of the split structure of the second distributor of the energy storage device proposed in some embodiments of this application. Figure 16 for Figure 15 The cross-sectional view of the second distributor shown indicates that the throttling structure 58 can also be located within the first distributor 55 or the second distributor 56.

[0388] like Figure 15 and Figure 16 As shown, a throttling structure 58 is provided inside the second distributor 56.

[0389] It should be noted that when a throttling structure 58 is provided in the first distributor 55 or the second distributor 56, such as Figure 16 As shown, a throttling structure 58 can be set in the main interface (refer to the second main interface 561); in other embodiments, the first distributor 55 or the second distributor 56 can also set the throttling structure 58 in multiple branch ports (refer to the second branch port 562).

[0390] It should also be noted that the refrigerant contains two phases, gas and liquid. Due to their different flow characteristics—the gas phase has low viscosity and high velocity, while the liquid phase has high viscosity and slow velocity—they easily form asymmetrical flow patterns such as stratified flow and wavy flow in the pipeline. This results in an uneven gas-liquid distribution upon entering the distributor, further leading to uneven refrigerant distribution and poor temperature uniformity among the battery devices. By setting a throttling structure 58 in the first distributor 55 or the second distributor 56, the throttling structure 58 can rectify or evenly distribute the refrigerant entering the first distributor 55 or the second distributor 56, which also helps to improve the uniformity of refrigerant distribution among the various refrigerant heat exchange components 300.

[0391] In some other embodiments, the first distributor 55 or the second distributor 56 may also be provided with a rectification or flow equalization structure to improve the uniformity of the distribution of refrigerant from the first distributor 55 or the second distributor 56 to each refrigerant heat exchange component 300.

[0392] The flow resistance of the throttling structure 58 is greater than or equal to 10% of the system flow resistance of the thermal management component 60. The principle of flow resistance management by the throttling structure 58 in this embodiment can be that the throttling structure 58 increases the system flow resistance to reduce the proportion of the pressure drop of each refrigerant heat exchange component 300 in the overall system pressure drop, thereby reducing the proportion of the pressure drop difference between each refrigerant heat exchange component 300 in the overall system pressure drop, and making the pressure drop of each refrigerant heat exchange component 300 flow path tend towards balance.

[0393] The system flow resistance of the thermal management component 60 can be obtained by measuring it through a flow resistance measuring mechanism during the operation of the thermal management component 60. The system flow resistance of the thermal management component 60 refers to the overall flow resistance of the thermal management component 60 during operation when it and the refrigerant heat exchange component 300 form a refrigerant circuit.

[0394] The flow resistance of the throttling structure 58 can be obtained by calculating or testing the parameters of the throttling structure 58. For example, if the throttling structure 58 is a capillary, the flow resistance of the capillary can be calculated based on the diameter and length of the capillary.

[0395] The greater the flow resistance of the throttling structure 58, the smaller the proportion of the pressure drop in the flow path of each refrigerant heat exchange component 300 in the system flow resistance, which is more conducive to improving the uniformity of refrigerant distribution in each refrigerant heat exchange component 300.

[0396] The flow resistance of the throttling structure 58 shall not exceed the system flow resistance of the thermal management component 60.

[0397] The flow resistance of the throttling structure 58 can be set to 10%, 20%, 30%, 40%, 50%, 70%, 75%, 78%, 80%, 82%, 85%, 90% of the system flow resistance of the thermal management component 60.

[0398] The flow resistance setting of the throttling structure 58 in this embodiment is beneficial to improving the pressure drop balance of each refrigerant heat exchange component 300, thereby improving the refrigerant distribution uniformity of each refrigerant heat exchange component 300, improving the temperature regulation uniformity of each refrigerant heat exchange component 300 on the battery device 10, which is beneficial to improving the temperature uniformity among each battery device 10 and improving the reliability of the energy storage device 1.

[0399] According to some embodiments of this application, optionally, the flow resistance of the throttling structure 58 is 60% to 90% of the system flow resistance of the thermal management component 60.

[0400] Optionally, the flow resistance of the throttling structure 58 is 80% of the system flow resistance of the thermal management component 60.

[0401] The flow resistance setting of the throttling structure 58 in this embodiment is beneficial to improving the pressure drop balance of each refrigerant heat exchange component 300, thereby improving the refrigerant distribution uniformity of each refrigerant heat exchange component 300, improving the temperature regulation uniformity of each refrigerant heat exchange component 300 on the battery device 10, which is beneficial to improving the temperature uniformity among each battery device 10 and improving the reliability of the energy storage device 1.

[0402] refer to Figure 13 and Figure 14 As shown, according to some embodiments of this application, optionally, the first distributor 55 is positioned higher than the connection port 350 along the height direction of the compartment 71; and / or, the second distributor 56 is positioned higher than the connection port 350 along the height direction of the compartment 71.

[0403] Optionally, along the height direction of the compartment 71, the first distributor 55 is positioned higher than the first connecting port 330, that is, the first distributor 55 is located above the first connecting port 330.

[0404] Optionally, along the height direction of the compartment 71, the second distributor 56 is positioned higher than the second connection port 340, that is, the second distributor 56 is located above the second connection port 340.

[0405] By positioning the first distributor 55 higher than the first connection port 330, when the thermal management component 60 is shut down, the refrigerant can be dispersed within the heat exchange plates 310 of each battery unit 10. This reduces the possibility of refrigerant concentrating in the first distributor 55 or the unit, thus affecting the start-up and shutdown of the thermal management component 60, and improves the reliability of the thermal management component 60. Similarly, by positioning the second distributor 56 higher than the second connection port 340, when the thermal management component 60 is shut down, the refrigerant can be dispersed within the heat exchange plates 310 of each battery unit 10. This reduces the possibility of refrigerant concentrating in the second distributor 56 or the unit, thus affecting the start-up and shutdown of the thermal management component 60, and improves the reliability of the thermal management component 60. In addition, the distributor is positioned higher than the connection port 350. When the refrigerant flows from the distributor to the connection port 350, it can follow the direction of gravity, reducing the possibility of uneven distribution of the refrigerant on the heat exchange plates 310 of each battery device 10 due to the influence of gravity caused by the different heights of the connection ports 350 of each battery device 10.

[0406] refer to Figure 13 and Figure 14As shown, according to some embodiments of this application, optionally, the first distributor is positioned higher than the first connection port 330 along the height direction of the hopper 71; and / or, the second distributor is positioned higher than the second connection port 340 along the height direction of the hopper 71.

[0407] Optionally, along the height direction of the compartment 71, the first distributor is positioned higher than the first connecting port 330, that is, the first distributor is located above the first connecting port 330.

[0408] Optionally, along the height direction of the compartment 71, the second distributor is positioned higher than the second connection port 340, that is, the second distributor is located above the second connection port 340.

[0409] By positioning the first distributor higher than the first connection port 330, when the thermal management component 60 is shut down, the refrigerant can be dispersed within the heat exchange plates 310 of each battery unit 10. This reduces the possibility of refrigerant concentrating in the first distributor or unit, thus affecting the start-up and shutdown of the thermal management component 60, and improves the reliability of the thermal management component 60. Similarly, by positioning the second distributor higher than the second connection port 340, when the thermal management component 60 is shut down, the refrigerant can be dispersed within the heat exchange plates 310 of each battery unit 10. This reduces the possibility of refrigerant concentrating in the second distributor or unit, thus affecting the start-up and shutdown of the thermal management component 60, and improves the reliability of the thermal management component 60.

[0410] like Figure 13 As shown, according to some embodiments of this application, optionally, the housing 71 includes an energy storage compartment 713 and an equipment compartment 714. The battery device 10 is disposed in the energy storage compartment 713, and a thermal management component 60 is disposed in the equipment compartment 714. The thermal management component 60 is connected to the first communication port 330 and the second communication port 340 respectively. The thermal management component 60 is used to provide refrigerant and forms a refrigerant circulation path with the refrigerant flow channel 320.

[0411] The energy storage compartment 713 and the equipment compartment 714 can be separated by partitions.

[0412] The housing 71 can integrate and install the battery device 10 and the thermal management component 60, which improves the integration of the energy storage device 1.

[0413] like Figure 13 As shown, according to some embodiments of this application, optionally, along the height direction of the storage body 71, the equipment compartment 714 is disposed at the bottom of the energy storage compartment 713.

[0414] The equipment compartment 714 is located at the bottom, which improves the ease of maintenance of the thermal management component 60.

[0415] In this embodiment, the thermal management component 60 of the energy storage device 1 may only include a cooling state, which may be a refrigeration system including a compressor 61, a throttling device 625 and a heat exchanger.

[0416] like Figures 4 to 14 and combined with, for example Figure 17 As shown, Figure 17 This is a simplified schematic diagram of the system principle connecting the thermal management component 60 and the heat exchange plate 310 according to some embodiments of this application. According to some embodiments of this application, optionally, a portion of the at least two connection ports 350 are designated as first connection ports 330, and the remaining connection ports 350 are designated as second connection ports 340. One of the first connection port 330 and the second connection port 340 serves as the inlet of the refrigerant flow channel 320, and the other as the outlet of the refrigerant flow channel 320. The thermal management component 60 includes a compressor 61, a valve body assembly 62, a throttling element 625, and a first heat exchanger 626. The valve body assembly 62 has a first interface 621, a second interface 622, a third interface 623, and a fourth interface 624. The compressor 61... The inlet of compressor 61 is connected to and communicates with the first interface 621, the outlet of compressor 61 is connected to and communicates with the fourth interface 624, the second interface 622 is connected to and communicates with the first heat exchanger 626, the third interface 623 is connected to the second connection port 340, the first heat exchanger 626 is connected to the first connection port 330, the throttling element 625 is connected in series between the first heat exchanger 626 and the first connection port 330, and the valve body assembly 62 enables the first interface 621 to selectively communicate with one of the second interface 622 and the third interface 623, and enables the fourth interface 624 to selectively communicate with the other of the second interface 622 and the third interface 623, so that the heat exchange plate 310 switches between the cooling state and the heating state.

[0417] The compressor 61, valve body assembly 62, throttling device 625, and first heat exchanger 626 are connected and interconnected via refrigerant piping 50, forming a direct cooling loop with the heat exchange plate 310. The throttling device 625 can be an expansion valve, specifically an electronic expansion valve. The valve body assembly 62 can be a four-way valve or a multi-way valve assembly.

[0418] In the refrigeration state, the first interface 621 is connected to the second interface 622, and the fourth interface 624 is connected to the third interface 623. The refrigerant flowing out of the compressor 61 enters the first heat exchanger 626 through the first interface 621 and the second interface 622, and then flows through the throttling element 625 to the first connecting port 330 and the heat exchange plate 310. Finally, it flows back to the compressor 61 through the heat exchange plate 310, the second connecting port 340, the third interface 623 and the fourth interface 624.

[0419] In heating mode, the first port 621 is connected to the third port 623, and the fourth port 624 is connected to the second port 622. The refrigerant flowing out of the compressor 61 enters the heat exchange plate 310 through the first port 621, the third port 623, and the second flow port. Then it flows out through the first connection port 330 and flows to the throttling element 625 and the first heat exchanger 626. Finally, it flows back to the compressor 61 through the first heat exchanger 626.

[0420] Optionally, in some embodiments, a control valve assembly can be used to switch the first connection port 330 and the second connection port 340. That is, in cooling mode, the first connection port 330 can serve as the inlet of the refrigerant channel 320 of the heat exchange plate 310, and the second connection port 340 can serve as the outlet of the refrigerant channel 320 of the heat exchange plate 310. Simultaneously, as needed, the second connection port 340 can be switched to become the inlet of the refrigerant channel 320 of the heat exchange plate 310, and the first connection port 330 can become the outlet of the refrigerant channel 320 of the heat exchange plate 310. In this way, when the area connected to the heat exchange plate 310 by the first connection port 330 is lower than the area connected by the second connection port 340 is higher, switching the ports allows for temperature balance between the two areas. Similarly, in heating mode, the first connection port 330 and the second connection port 340 can also be switched.

[0421] It should be noted that, in the above embodiments, unless otherwise specified, the general or set cooling state is that the first connection port 330 is the inlet of the cooling state and the second connection port 340 is the outlet of the cooling state; the general or set heating state is that the first connection port 330 is the outlet of the heating state and the second connection port 340 is the inlet of the heating state.

[0422] The thermal management component 60 can switch between direct cooling and direct heating, improving the thermal management capability of the battery device 10.

[0423] like Figure 18 As shown, Figure 18 The following is a schematic diagram of an energy storage system proposed in some embodiments of this application. Some embodiments of this application also provide an energy storage system, including an energy storage converter 2 and an energy storage device 1 proposed in this application or any embodiment of this application. The energy storage converter 2 is used to electrically connect the power generation device 3 and the energy storage device 1.

[0424] The energy storage system includes an energy storage converter 2, which can be electrically connected to a power generation device 3 to convert the electrical power provided by the power generation device 3. The energy storage system may also include an energy storage device 1, which is electrically connected to the energy storage converter 2. The energy storage converter 2 converts the electrical energy provided by the power generation device 3 and then stores it in the energy storage device 1.

[0425] The energy storage converter 2 can be a power conversion device, used to connect between the power generation device 3 and the energy storage device 1. The power generation device 3 generates electrical energy and stores it in the energy storage device 1 via the power conversion device. The application of the energy storage device 1 in this energy storage system can effectively improve the operational safety of the system. In specific implementations, the power generation device 3 can be a solar panel, a hydroelectric power generation device 3, a thermal power generation device 3, etc. The specific type of the power generation device 3 is not limited in this application.

[0426] As an example, such as Figure 18 As shown, the energy storage system includes an energy storage device 1 and an energy storage converter 2. Two power generation devices 3 transmit the generated electrical energy to the energy storage converter 2, and the energy storage converter 2 then imports the electrical energy into the energy storage device 1 for storage.

[0427] The energy storage system of this embodiment has the same beneficial effects as the energy storage device 1 proposed in this application or any embodiment of this application.

[0428] like Figure 19 As shown, Figure 19 The following is a schematic diagram of a charging system proposed in some embodiments of this application. Some embodiments of this application also provide a charging system including a charging pile 4 and an energy storage device 1 or energy storage system proposed in this application or any embodiment of this application. The energy storage device 1 is used to provide electrical energy to the charging pile 4.

[0429] The charging system includes a charging pile 4, which is used to charge electrical equipment. The charging system may also include an energy storage device 1, which is electrically connected to the charging pile 4 and is used to provide power to the charging pile 4.

[0430] It should be noted that the charging pile 4 is electrically connected to the battery cell 210 in the energy storage device 1 via a cable. The battery cell 210 can supply its stored electrical energy to the charging pile 4. The charging pile 4 has a connector that can be connected to electrical equipment, thereby replenishing the equipment's energy. The use of the energy storage device 1 in this charging system can effectively improve the safety of the charging system and also help to improve the flexibility of the charging system during deployment.

[0431] In a charging system, there can be one charging pile 4, and the energy storage device 1 provides power to one charging pile 4; there can also be multiple charging piles 4, and the energy storage device 1 provides power to multiple charging piles 4.

[0432] As an example, such as Figure 19 As shown, the charging system includes an energy storage device 1 and two charging piles 4, with the energy storage device 1 providing power to the two charging piles 4.

[0433] The energy storage device 1 may include a battery device 10, which is electrically connected to the charging pile 4 so that the battery device 10 can provide power to the charging pile 4.

[0434] The charging system of this embodiment has the same beneficial effects as the energy storage device 1 proposed in this application or any embodiment of this application.

[0435] like Figures 2 to 12This embodiment provides a battery device 10, including a housing 100, a battery cell assembly 200, an output electrode assembly 400, and a refrigerant heat exchange assembly 300. The refrigerant heat exchange assembly 300 includes a heat exchange plate 310, which is disposed on one side of the battery cell assembly 200 along the third direction Z and forms the bottom wall of the housing 100. The plate surface of the heat exchange plate 310 extends along the third direction Y and the second direction X. The heat exchange plate 310 is provided with a refrigerant flow channel 320 for refrigerant flow, a first connecting port 330, and a second connecting port 340. Along the second direction X, the output electrode assembly 400 is disposed on the side wall of the housing 100, and the first connecting port 330, the second connecting port 340, and the output electrode assembly 400 are located at the same end of the housing 100. Along the third direction Y, the second connecting port 340 is disposed closer to the output electrode assembly 400 than the first connecting port 330. The second direction X, the third direction Y, and the first direction Z intersect each other. The refrigerant heat exchange assembly 300 has at least a cooling state. In the cooling state, the first connection port 330 is the inlet of the refrigerant flow channel 320, and the second connection port 340 is the outlet of the refrigerant flow channel 320. Along the third direction Y, the output electrode assembly 400 and the second connection port 340 are located on one side of the center line B1, and the first connection port 330 is located on the other side of the center line B1. The first connection port 330 is located at one end of the heat exchange plate 310, and the second connection port 340 is located at the other end of the heat exchange plate 310 along the third direction Y. The output electrode assembly 400 has a connection port 410 for connecting to a conductive wire harness. Along the third direction Y, the connection port 410 is located between the first connection port 330 and the second connection port 340. The heat exchange plate 310 includes a body portion 311 and an interface portion 312. Along the third direction Z, the body portion 311 is directly opposite the battery cell assembly 200. Along the second direction X, the interface portion 312 protrudes relative to the battery cell assembly 200. The interface portion 312 is provided with a first connecting port 330 and a second connecting port 340. A refrigerant flow channel 320 is provided within the body portion 311 and the interface portion 312. The interface portion 312 includes a first part 313 and a second part 314. The second part 314 is positioned closer to the output electrode assembly 400 than the first part 313. The first part 313 and the second part 314 are arranged at intervals along the third direction Y. The first connecting port 330 is located in the first part 313, and the second connecting port 340 is located in the second part 314. The refrigerant heat exchange assembly 300 also includes a first connector 315. A first connecting port 330 and a second connecting port 340 are respectively connected to the first connector 315. The first connector 315 is disposed at the interface portion 312 and is used to connect to the refrigerant pipeline 50. Along the third direction Z, the first connector 315 is located on the side of the interface portion 312 facing the battery cell assembly 200. The refrigerant heat exchange assembly 300 also includes a connecting bracket 316, which is connected to the interface portion 312. The connecting bracket 316 is used to install a second connector 57 of the refrigerant pipeline 50 for connecting to the first connector 315.Along the third direction Z, the connecting bracket 316 is located on the side of the interface portion 312 facing the battery cell assembly 200. The refrigerant flow channel 320 includes a first flow section 321, a middle flow section 322, and a tail flow section 323 connected in sequence. The first connection port 330, the first flow section 321, the middle flow section 322, the tail flow section 323, and the second connection port 340 are connected in series. The first flow section 321 and the tail flow section 323 are at least partially adjacent and configured to exchange heat with each other. The first process segment 321 includes a first sub-first segment 3211 and a second sub-first segment 3212. The first sub-first segment 3211 is connected between the first connection port 330 and the second sub-first segment 3212. The second sub-first segment 3212 is connected to the middle process segment 322. The first sub-first segment 3211 extends along the third direction Y. The tail process segment 323 includes a first sub-tail segment 3231. The second sub-first segment 3212 and the first sub-tail segment 3231 both extend along the second direction X. The first sub-tail segment 3231 is connected to the second connection port 340. The second sub-first segment 3212 and the first sub-tail segment 3231 are adjacent and configured to exchange heat with each other. The middle process segment 322 includes a first middle section 3221, which includes a first sub-middle section 3222, a second sub-middle section 3223, a third sub-middle section 3224, and a fourth sub-middle section 3225 arranged in series. The first sub-middle section 3222, the second sub-middle section 3223, the third sub-middle section 3224, and the fourth sub-middle section 3225 all extend in the same direction X. The fourth sub-middle section 3225 and the third sub-middle section 3224 are located between the first sub-middle section 3222 and the second sub-middle section 3223. The third sub-middle section 3224 is adjacent to the second sub-middle section 3223, and the fourth sub-middle section 3225 is adjacent to the first sub-middle section 3222. In the same middle process segment 322, the first sub-middle section 3222 is connected in series between the fourth sub-middle section 3225 and the first process segment 321. Along the third direction Y, the second sub-head segment 3212 and the first sub-tail segment 3231 are located on one side of the first middle segment, and the first sub-tail segment 3231 is located on the side of the first sub-head segment 3211 away from the first middle segment. The first sub-head segment 3211 and the first sub-middle segment 3222 are arranged adjacent to each other. The middle process section 322 includes a second middle section 3226, which is located on the other side of the first middle section along the third direction Y. The second middle section 3226 includes a fifth sub-middle section 3227 and a sixth sub-middle section 3228 arranged in series. The fourth sub-middle section 3225, the fifth sub-middle section 3227, the sixth sub-middle section 3228 and the tail process section 323 are connected in series. The fifth sub-middle section 3227 and the sixth sub-middle section 3228 are both arranged along the second direction X and along the third direction Y. The sixth sub-middle section 3228 is located on the side of the fifth sub-middle section 3227 away from the first middle section 3221. The fifth sub-middle section 3227 is adjacent to the second sub-middle section 3223.The tail section 323 also includes a second sub-tail section 3232, which extends along the third direction Y. The second sub-tail section 3232 is connected in series between the sixth sub-middle section 3228 and the first sub-tail section 3231. Along the second direction X, the first middle section 3221 and the second middle section 3226 are located between the second sub-tail section 3232 and the first sub-head section 3211. There are multiple battery cell modules 200, including a first battery cell module, a second battery cell module, a third battery cell module, and a fourth battery cell module. The first battery cell module, the second battery cell module, the third battery cell module, and the fourth battery cell module are arranged along a third direction Y. Among them, the first sub-tail segment 3231 and the first sub-head segment 3211 correspond to the first battery cell module, the first sub-middle segment 3222 and the fourth sub-middle segment 3225 correspond to the second battery cell module, the second sub-middle segment 3223 and the third sub-middle segment 3224 correspond to the third battery cell module, and the fifth sub-middle segment 3227 and the sixth sub-middle segment 3228 correspond to the fourth battery cell module. The battery device 10 also includes a second limiting member 104. Along the second direction X, the second limiting member 104 is disposed at one end of the battery cell assembly 200 away from the output electrode assembly 400. The second limiting member 104 is used to abut against the battery cell assembly 200. The second limiting member 104 extends along the third direction Y. Along the second direction X, a second sub-tail segment 3232 is spaced apart from the second limiting member 104. The second sub-tail segment 3232 is located on the side of the second limiting member 104 facing the battery cell assembly 200. The battery device 10 also includes a first limiting member 103. Along the second direction X, the first limiting member 103 is disposed at one end of the battery cell assembly 200 facing the output electrode assembly 400. The first limiting member 103 is used to abut against the battery cell assembly 200. The first limiting member 103 extends along the third direction Y. Along the second direction X, a first sub-head segment 3211 is spaced apart from the first limiting member 103. The first sub-head segment 3211 is located on the side of the first limiting member 103 facing the battery cell assembly 200.

[0436] The first flow segment 321, the middle flow segment 322, and the last flow segment 323 each include multiple parallel and one-to-one connected sub-flow channels. A branching segment 326 (defined as the first branching segment 324) is provided between the first connecting port 330 and the first flow segment 321. The first branching segment 324 includes two-stage branching sections 3263: a first-stage branching section 3261 (defined as the first first-stage branching section 3241) and a final-stage branching section (defined as the first final-stage branching section 3242). The first first-stage branching section 3241 is the first main segment. The outlet of the first final-stage branching section 3242 forms multiple first branches. The first first-stage branching section 3241 is connected to the first connecting port 330, and the multiple first branches of the first final-stage branching section 3242 are one-to-one connected to the multiple sub-flow channels of the first flow segment 321. A diversion section 326 (defined as the second diversion section 325) is provided between the second connecting port 340 and the tail flow section 323. The second diversion section 325 includes two-stage diversion parts 3263, namely the first-stage diversion part 3261 (defined as the second first-stage diversion part 3251) and the last-stage diversion part (defined as the second last-stage diversion part 3252). The second first-stage diversion part is the second main section. The outlet of the second last-stage diversion part 3252 forms multiple second branches. The second first-stage diversion part 3251 is connected to the second connecting port 340. The multiple second branches of the second last-stage diversion part 3252 are connected to the multiple sub-channels of the tail flow section 323 one by one. The first connecting port 330 is connected to the middle of the first primary flow branch 3241. The two ends of the first primary flow branch 3241 are respectively connected to first secondary flow branch 3242, forming four first branches. The second connecting port 340 is connected to the middle of the second primary flow branch 3251. The two ends of the second primary flow branch 3251 are respectively connected to two second secondary flow branch 3252, forming four second branches. Along the second direction X, the connection position between the second primary flow branch 3251 and the second branches is located on the side of the first limiting member 103 away from the battery cell assembly 200. Partial areas between the multiple sub-channels of the tail flow section 323 are configured to be interconnected. The refrigerant heat exchange assembly 300 includes a heat exchange plate 310, which comprises a main plate 317 and a heat spreader plate 318. The main plate 317 has a groove 3171. The heat spreader plate 318 is located on the side of the main plate 317 facing the battery cell assembly 200 and covers the main plate 317, forming a refrigerant flow channel 320 in cooperation with the groove 3171. Both the main plate 317 and the heat spreader plate 318 include a body portion 311, a first portion 313, and a second portion 314. Both the main plate 317 and the heat spreader plate 318 are made of aluminum. The housing 100 can be made of aluminum, and the first limiting member 103 and the second limiting member 104 can be part of the housing 100, which can also be made of aluminum.The yield strength of the heat exchange plate 310 is greater than 4 MPa. An insulating layer and an anti-corrosion layer are provided on the side of the heat exchange plate 310 facing the battery cell assembly 200, and an insulating layer and a heat insulation layer 3193 are provided on the side of the heat exchange plate 310 away from the battery cell assembly 200.

[0437] Optionally, refer to Figure 13 As shown, the battery device 10 also includes a first detection element 351 and a second detection element 352. The first detection element 351 is connected to the first connection port 330 and is used to detect the temperature and / or pressure of the refrigerant flowing through the first connection port 330. The second detection element 352 is connected to the second connection port 340 and is used to detect the temperature and / or pressure of the refrigerant flowing through the second connection port 340.

[0438] In this embodiment, the battery device 10 has a first connecting port 330 and a second connecting port 340 on both sides. The heating inlet (second connecting port 340) is closer to the conductive wire harness 81, and the cooling inlet (first connecting port 330) is farther away from the conductive wire harness 81. In cooling mode, the refrigerant flows in through the cooling inlet and splits into four independent sub-channels before flowing into the first limiting member 103. It first flows through the area of ​​the first battery cell assembly (installation area A1), then through the areas of the second, third, and fourth battery cell assemblies (refer to installation areas A2, A3, and A4), and finally mixes in the area of ​​the fourth battery cell assembly (installation area A1) before flowing out from the heating inlet. If the refrigerant is in a two-phase state within the heat exchange plate 310, the evaporation temperature will change due to the pressure drop of the cold plate, so liquid separation needs to be completed outside the battery cell assembly 200. Since the thermal management components 60 primarily control outlet superheat and outlet pressure, thereby controlling inlet mass flow rate, if the inlet and outlet are too close, the high thermal conductivity of aluminum can cause issues. Taking refrigeration as an example, the inlet low-temperature refrigerant will exchange heat with the outlet superheated gaseous refrigerant. Since the gaseous refrigerant has a lower heat capacity, its temperature is more prone to change. If the outlet refrigerant is heat-exchanged by the inlet, the actual cold plate outlet cannot reflect the actual internal superheat of the cold plate, leading to a vicious cycle in the system. Therefore, this design separates the inlet and outlet, placing them on opposite sides of the battery device 10. A second sensor is installed at the outlet to detect pressure and temperature, ensuring that the refrigerant temperature does not exceed a preset value, which can be 0-5℃.

[0439] like Figure 13 , Figure 14As shown, this embodiment also provides an energy storage device 1, including: a storage body 71 and a plurality of battery devices 10 as proposed in this application or any embodiment of this application, wherein the battery devices 10 are disposed within the storage body 71. The storage body 71 includes a storage body 711, which has an opening. An output electrode assembly 400, a first communication port 330, and a second communication port 340 are provided at the end of the battery device 10 facing the opening. The storage body 71 also includes a door, which is disposed at the opening in a manner that allows it to be opened and closed. The opening is oriented in the same direction as the second direction X, and the second direction X and the third direction Y intersect at the height direction of the storage body 71. The energy storage device 1 also includes a refrigerant pipeline 50, which includes a first pipeline 51 and a second pipeline 52. The first pipeline 51 is connected to and communicates with a first connection port 330, and the second pipeline 52 is connected to and communicates with a second connection port 340. Along the third direction Y, the first pipeline 51 is located on the side of the first connection port 330 away from the output electrode assembly 400, and the second pipeline 52 is located on the side of the second connection port 340 facing the first connection port 330. The flow cross-section of the first pipeline 51 is smaller than the flow cross-section of the second pipeline 52. The refrigerant piping 50 also includes a first distributor 55, a second distributor 56, a third piping 53, and a fourth piping 54. The first distributor 55 has a first main interface 551 and multiple first branch ports 552. The first main interface 551 is connected to and communicates with the third piping 53, and the multiple first branch ports 552 are connected to and communicate with the first piping 51 of the multiple battery devices 10 in a one-to-one correspondence. The second distributor 56 has a second main interface 561 and multiple second branch ports 562. The second main interface 561 is connected to and communicates with the fourth piping 54, and the multiple second branch ports 562 are connected to and communicate with the second piping 52 of the multiple battery devices 10 in a one-to-one correspondence. Along the third direction Y, the first distributor 55, the second distributor 56, the third piping 53, and the fourth piping 54 are all located on the side of the battery device 10 away from the output electrode assembly 400. The compartment 71 contains at least one row of battery devices 10 arranged along the height direction of the compartment 71. Along the height direction of the compartment 71, the output electrode assemblies 400 of adjacent battery devices 10 are connected by conductive wire harnesses 81. Along the third direction Y, the conductive wire harnesses 81 are located on the side of the output electrode assembly 400 facing away from the refrigerant pipe 50. Along the height direction of the compartment 71, the first distributor 55 is positioned higher than the first connecting port 330; along the height direction of the compartment 71, the second distributor 56 is positioned higher than the second connecting port 340. Each second branch port 562 is connected to the corresponding second pipe 52 of the battery device 10 via a capillary tube, which serves as a throttling structure 58. The housing 71 includes an energy storage compartment 713 and an equipment compartment 714. The battery device 10 is disposed in the energy storage compartment 713. The equipment compartment 714 is provided with a thermal management component 60. The thermal management component 60 is connected to the first connection port 330 and the second connection port 340 respectively. The thermal management component 60 is used to provide refrigerant and forms a refrigerant circulation path with the refrigerant flow channel 320.Along the height direction of the storage body 71, the equipment compartment 714 is located at the bottom of the energy storage compartment 713. The thermal management component 60 includes a compressor 61, a four-way valve, a throttling element 625, and a first heat exchanger 626. The four-way valve has a first port 621, a second port 622, a third port 623, and a fourth port 624. The inlet of the compressor 61 is connected to and communicates with the first port 621, and the outlet of the compressor 61 is connected to and communicates with the fourth port 624. The second port 622 is connected to and communicates with the first heat exchanger 626, the third port 623 is communicated with the second connection port 340, and the first heat exchanger 626 is communicated with the first connection port 330. The throttling element 625 is connected in series between the first heat exchanger 626 and the first connection port 330. The four-way valve enables the first port 621 to selectively communicate with one of the second port 622 and the third port 623, and enables the fourth port 624 to selectively communicate with the other of the second port 622 and the third port 623, so that the heat exchange plate 310 switches between a cooling state and a heating state.

[0440] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. The descriptions of the various embodiments above tend to emphasize the differences between the various embodiments, and their similarities or similarities can be referred to each other. For the sake of brevity, these will not be repeated here.

[0441] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Battery cell; A heat exchange plate is provided on at least one side of the battery cell, and the heat exchange plate is provided with a refrigerant flow channel. The heat exchange plate exchanges heat with the battery cell through the refrigerant in the refrigerant flow channel. The refrigerant flow channel includes a first connecting port, a second connecting port, and multiple sub-flow channels that are in fluid communication. The multiple sub-flow channels are arranged in parallel between the first connecting port and the second connecting port. Each of the multiple sub-flow channels has a tail flow section that communicates with the second connecting port. The tail flow section is provided with a mixing zone that allows the multiple sub-flow channels to communicate with each other.

2. The battery device according to claim 1, characterized in that, The ratio of the sum of the flow areas of the plurality of sub-channels to the flow area of ​​the mixing zone is 0.8 to 1.

2.

3. The battery device according to claim 2, characterized in that, The sum of the flow areas of the multiple sub-channels is equal to the flow area of ​​the mixing zone.

4. The battery device according to claim 1, characterized in that, Along the arrangement direction of the plurality of sub-channels, the distance between the two sidewalls of the two sub-channels that are furthest apart from each other is W1, and the width dimension of the mixing zone is W2, wherein W2 is 0.8 to 1.2 times W1.

5. The battery device according to claim 1, characterized in that, The mixing zone is provided with a turbulence section, which is connected between two opposite side walls of the refrigerant flow channel.

6. The battery device according to claim 5, characterized in that, The flow-dispersing parts are provided in multiple ways, and the multiple flow-dispersing parts are spaced apart along the extension direction of the refrigerant flow channel.

7. The battery device according to claim 6, characterized in that, The turbulence section includes a plurality of sub-turbulence sections, which are arranged at intervals along the arrangement direction of the plurality of sub-flow channels. Along the extension direction of the refrigerant flow channel, in two adjacent turbulence sections, the sub-turbulence sections of one turbulence section are at least partially offset from the sub-turbulence sections of the other turbulence section.

8. The battery device according to claim 7, characterized in that, The circumferential portion of the sub-turbulence section is at least partially arc-shaped.

9. The battery device according to claim 1, characterized in that, The heat exchange plate has a cooling state. In the cooling state, the first connecting port supplies refrigerant to flow into the refrigerant channel, and the second connecting port supplies refrigerant to flow out of the refrigerant channel.

10. The battery device according to claim 1, characterized in that, The plurality of sub-channels extend from one end connected to the second connection port toward the first connection port within a predetermined distance range, which constitutes the tail flow segment. The predetermined distance is less than or equal to half of the total extension length of the plurality of sub-channels.

11. The battery device according to any one of claims 1-10, characterized in that, The area where the projection of the battery cell on the heat exchange plate is located is the first region; The refrigerant flow channel further includes a first branch section and a second branch section. The first connecting port branches through the first branch section to form the plurality of sub-flow channels. The first branch section is located outside the first region. The second connecting port branches through the second branch section to form the plurality of sub-flow channels. The second branch section is located outside the first region.

12. The battery device according to claim 11, characterized in that, The distance between the diversion point of the first diversion section and the first area is set to be greater than or equal to 10 mm and less than or equal to 500 mm; And / or, the interval W between the diversion position of the second diversion section and the interval of the first region is set to be greater than or equal to 10 mm and less than or equal to 500 mm.

13. The battery device according to claim 12, characterized in that, The distance between the diversion point of the first diversion section and the first area is set to be greater than or equal to 10 mm and less than or equal to 300 mm; And / or, the interval W3 between the diversion position of the second diversion section and the interval of the first region is set to be greater than or equal to 10 mm and less than or equal to 300 mm.

14. The battery device according to claim 11, characterized in that, The battery device further includes a first limiting member and a second limiting member, the first limiting member and the second limiting member being disposed at opposite ends of the battery cell along a second direction, and the first limiting member and the second limiting member being respectively abutting against the battery cell; Along the second direction, the first diversion section is disposed on the side of the first limiting member away from the second limiting member, or the first diversion section is disposed on the side of the first limiting member away from the second limiting member, and the second diversion section is disposed on the side of the first limiting member away from the second limiting member, or the second diversion section is disposed on the side of the first limiting member away from the second limiting member. The second direction intersects with the first direction, and the first direction is the arrangement direction between the battery cell and the heat exchange plate.

15. The battery device according to any one of claims 1-10, characterized in that, The first connection port and the second connection port are set at a predetermined distance interval.

16. The battery device according to claim 15, characterized in that, The first connection port and the second connection port are located at the same end of the heat exchange plate along the second direction. Along the third direction, the first connection port and the second connection port are spaced apart by the predetermined distance. The predetermined distance is greater than or equal to one-third of the size of the heat exchange plate along the third direction and less than the size of the heat exchange plate along the third direction. The first direction, the second direction and the third direction intersect each other. The first direction is the arrangement direction between the battery cell and the heat exchange plate.

17. The battery device according to claim 15, characterized in that, The predetermined distance is set to be greater than or equal to 30 millimeters.

18. The battery device according to claim 16, characterized in that, Along the third direction, the first connecting port and the second connecting port are located at both ends of the heat exchange plate.

19. The battery device according to claim 16, characterized in that, The plurality of sub-channels also have a head flow segment and a middle flow segment. The head flow segment, the middle flow segment, and the tail flow segment each include a plurality of sub-channels, and the plurality of sub-channels of the head flow segment, the middle flow segment, and the tail flow segment are connected in a one-to-one correspondence. The first connection port, the head flow segment, the middle flow segment, the tail flow segment, and the second connection port are connected in series. The head flow segment and the tail flow segment are at least partially adjacent and configured to exchange heat with each other.

20. The battery device according to claim 19, characterized in that, The head flow segment includes a first sub-head segment and a second sub-head segment. The first sub-head segment is connected between the first connecting port and the second sub-head segment. The second sub-head segment is connected to the middle flow segment. The first sub-head segment extends along the third direction. The tail flow segment includes a first sub-tail segment. The second sub-head segment and the first sub-tail segment both extend along the second direction. The first sub-tail segment is connected to and communicates with the second connecting port. The second sub-head segment and the first sub-tail segment are adjacent to each other and configured to exchange heat. The mixing zone is located in the first sub-tail segment.

21. The battery device according to claim 20, characterized in that, The middle process segment includes a first middle section, which includes a first sub-middle section, a second sub-middle section, a third sub-middle section, and a fourth sub-middle section arranged in series. The first sub-middle section, the second sub-middle section, the third sub-middle section, and the fourth sub-middle section all extend in the same direction. The fourth sub-middle section and the third sub-middle section are located between the first sub-middle section and the second sub-middle section. The third sub-middle section is adjacent to the second sub-middle section, and the fourth sub-middle section is adjacent to the first sub-middle section. In the same middle process segment, the first sub-middle section is connected in series between the fourth sub-middle section and the head process segment.

22. The battery device according to claim 21, characterized in that, Along the third direction, the second sub-head segment and the first sub-tail segment are both located on one side of the first middle segment, and the first sub-tail segment is located on the side of the first sub-head segment away from the first middle segment. The first sub-head segment and the first sub-middle segment are arranged adjacent to each other.

23. The battery device according to claim 22, characterized in that, The middle process segment includes a second middle section, which is located on the other side of the first middle section along the third direction; The second middle section includes a fifth sub-middle section and a sixth sub-middle section arranged in series. The fourth sub-middle section, the fifth sub-middle section, the sixth sub-middle section and the tail flow section are connected in series. The fifth sub-middle section and the sixth sub-middle section are both arranged along the second direction. Along the third direction, the sixth sub-middle section is located on the side of the fifth sub-middle section away from the first middle section. The fifth sub-middle section is adjacent to the second sub-middle section.

24. The battery device according to claim 23, characterized in that, The tail section further includes a second sub-tail section, which extends along the third direction and is connected in series between the sixth sub-middle section and the first sub-tail section. Along the second direction, the first middle section and the second middle section are located between the second sub-tail section and the first sub-head section.

25. The battery device according to claim 24, characterized in that, The battery cells are multiple, and the multiple battery cells form multiple battery cell assemblies. Each battery cell assembly includes multiple battery cells arranged along the second direction. The multiple battery cell assemblies include a first battery cell assembly, a second battery cell assembly, a third battery cell assembly, and a fourth battery cell assembly. The first battery cell assembly, the second battery cell assembly, the third battery cell assembly, and the fourth battery cell assembly are arranged along the third direction. The first sub-tail segment and the second sub-head segment are set corresponding to the first battery cell assembly. The first sub-middle segment and the fourth sub-middle segment are set corresponding to the second battery cell assembly. The second sub-middle segment and the third sub-middle segment are set corresponding to the third battery cell assembly. The fifth sub-middle segment and the sixth sub-middle segment are set corresponding to the fourth battery cell assembly.

26. The battery device according to claim 25, characterized in that, The battery device further includes a first limiting member and a second limiting member. The first limiting member and the second limiting member are disposed at both ends of the battery cell along the second direction, and the first limiting member is located at one end of the battery cell facing the communication port. The first limiting member and the second limiting member are respectively abutted against the battery cell. The first limiting member and the second limiting member extend along the third direction. Along the second direction, a first sub-head segment is spaced apart from the first limiting member and is located on the side of the first limiting member facing the battery cell assembly. Along the second direction, a second sub-tail segment is spaced apart from the second limiting member and is located on the side of the second limiting member facing the battery cell.

27. The battery device according to any one of claims 1-10, characterized in that, The heat exchange plate includes a body and an interface. Along a first direction, the body is positioned directly opposite the battery cell. Along a second direction, the interface protrudes relative to the battery cell. The interface has a first communication port and a second communication port. Both the body and the interface have interconnected refrigerant channels. The first direction is the arrangement direction between the battery cell and the heat exchange plate, and the second direction intersects with the first direction.

28. The battery device according to claim 27, characterized in that, The interface includes a first part and a second part, which are arranged at intervals along a third direction. The first connection port is located in the first part, and the second connection port is located in the second part. The first direction, the second direction, and the third direction intersect each other.

29. The battery device according to claim 27, characterized in that, The battery device further includes a first connector, the communication port is connected to the first connector, the first connector is disposed at the interface and is used to connect to the refrigerant pipeline, and along the first direction, the first connector is located on the side of the interface facing the battery cell.

30. The battery device according to claim 29, characterized in that, The battery device further includes a connecting bracket, which is connected to the interface portion and is used to install a second connector for the refrigerant pipeline to connect with the first connector.

31. The battery device according to claim 30, characterized in that, Along the first direction, the connecting bracket is located on the side of the interface portion facing the battery cell.

32. The battery device according to any one of claims 1-10, characterized in that, The heat exchange plate includes a main plate and a heat spreader plate. The main plate has a groove. The heat spreader plate is located on the side of the main plate facing the battery cell and covers the main plate, and cooperates with the groove to form the refrigerant flow channel.

33. The battery device according to claim 32, characterized in that, The main body plate and / or the heat spreader plate are aluminum plates.

34. The battery device according to any one of claims 1-10, characterized in that, The yield strength of the heat exchange plate is greater than 4 MPa.

35. The battery device according to any one of claims 1-10, characterized in that, The heat exchange plate is provided with an insulation layer and / or an anti-corrosion layer on the side facing the battery cell, and / or the heat exchange plate is provided with an insulation layer, an anti-corrosion layer and / or a heat insulation layer on the side away from the battery cell.

36. The battery device according to any one of claims 1-10, characterized in that, The battery device further includes a housing, the housing having a receiving cavity, the battery cells being disposed in the receiving cavity, and the heat exchange plate being connected to the housing or at least partially serving as a wall of the housing.

37. An energy storage device, characterized in that, include: Warehouse body; At least one battery device according to any one of claims 1-36, wherein the battery device is disposed within the compartment; The thermal management component is connected to the refrigerant channel and forms a refrigerant circulation loop.

38. An energy storage system, characterized in that, It includes an energy storage converter and an energy storage device as described in claim 37, wherein the energy storage converter is used to electrically connect the power generation device and the energy storage device.

39. A charging system, characterized in that, include: Charging stations; The energy storage device as described in claim 37 or the energy storage system as described in claim 38, wherein the energy storage device is used to provide electrical energy to the charging pile.

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