Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device. The battery device (200) comprises a box body (20) and a plurality of single batteries (300), the box body (20) comprises a top cover (21), the top cover (21) is provided with a first channel (210) for a heat exchange medium to circulate, and the side wall, facing the single batteries (300), of the first channel (210) is provided with spray holes (214); and the inner diameter of the spray hole (214) is gradually reduced in the direction from the top cover (21) to the bottom of the box body (20). A first channel (210) of a top cover (21) is provided with a spray hole (214) for spraying a heat exchange medium to a battery monomer (300) so as to quickly adjust the temperature of the battery monomer (300), and the inner diameter of the spray hole (214) is gradually reduced, so that the sprayed heat exchange medium can be kept in a laminar flow state, the flow speed of the heat exchange medium is stable, the flow resistance is reduced, and the heat exchange efficiency is improved. And the heat exchange medium can perform more uniform and rapid heat exchange on the battery monomers.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] Battery devices typically consist of individual battery cells, which generate a significant amount of heat during charging and discharging. However, current battery devices often use cooling plates placed between the sides of the battery cells to cool them. This cooling method has poor heat dissipation efficiency, affecting the charging and discharging performance of the battery device. Utility Model Content

[0004] The purpose of this application is to provide a battery device and an electrical device to solve the problem in the related art where the heat dissipation efficiency of the battery device is poor, which affects the charging and discharging performance of the battery device.

[0005] In a first aspect, embodiments of this application provide a battery device, including:

[0006] A housing having a receiving space, the housing including a top cover located on top of the receiving space;

[0007] Multiple battery cells are installed in the housing space;

[0008] The top cover is provided with a first channel for the heat exchange medium to flow through. The first channel has a spray hole on the side wall facing the battery cell, and the spray hole is connected to the receiving space. The inner diameter of the spray hole gradually decreases from the top cover to the bottom of the box.

[0009] In the technical solution of this application embodiment, a nozzle is provided on the first channel of the top cover to spray a heat exchange medium onto the battery cells. As the heat exchange medium flows downwards, it contacts the battery cells to quickly regulate their temperature, improve their charging and discharging performance, and thus enhance the charging and discharging performance of the battery device. The nozzle's inner diameter is gradually narrowing, reducing the flow area and maintaining the sprayed heat exchange medium in a laminar flow state. This ensures a stable flow rate and reduces flow resistance, minimizing splashing and reducing mist or bubbles caused by splashing. This reduces uneven heat exchange caused by mist or bubbles, resulting in more uniform heat exchange between the heat exchange medium and the battery cells.

[0010] In some embodiments, the line formed by the intersection of the inner surface of the nozzle and the cross section containing the centerline of the nozzle is arc-shaped.

[0011] By using the above technical solution, the inner surface of the nozzle is made arc-shaped, which can further reduce the flow resistance, better maintain the laminar flow state of the heat exchange medium, and make the flow rate of the sprayed heat exchange medium stable.

[0012] In some embodiments, the inner surface of the nozzle is provided with a lotus leaf effect coating.

[0013] By using the above technical solution, a lotus leaf effect coating can be applied to the inner surface of the nozzle to reduce the flow resistance of the heat exchange medium, reduce droplet adhesion and accumulation, better maintain the laminar flow state of the heat exchange medium, and make the flow rate of the sprayed heat exchange medium stable.

[0014] In some embodiments, the roughness of the inner surface of the nozzle is less than or equal to 0.2 mm.

[0015] By using the above technical solution, the inner surface roughness of the nozzle is set to be less than or equal to 0.2 mm, which can make the inner surface of the nozzle smoother, reduce the flow resistance of the heat exchange medium, reduce turbulence, better maintain the laminar flow state of the heat exchange medium, and make the flow velocity of the sprayed heat exchange medium stable.

[0016] In some embodiments, the nozzle is a circular orifice, with the diameter of the nozzle inlet ranging from 2mm to 10mm, the diameter of the nozzle outlet ranging from 0.5mm to 2mm, and the length of the nozzle ranging from 2mm to 5mm.

[0017] The above technical solutions optimize the structural design of the nozzles, further reduce flow resistance and turbulence, better maintain the laminar flow state of the heat exchange medium, and ensure a stable flow velocity of the jet heat exchange medium.

[0018] In some embodiments, the diameter of the nozzle inlet ranges from 3 mm to 4 mm, and the diameter of the nozzle outlet ranges from 0.8 mm to 1.5 mm.

[0019] The above technical solutions can better optimize the structural design of the nozzles, reduce flow resistance, and enable the heat exchange medium to maintain a laminar flow state.

[0020] In some embodiments, the battery device includes a plurality of battery cells arranged along a first direction, and a flow-guiding space is provided between two adjacent battery cells along the first direction, with the nozzles positioned directly opposite the corresponding flow-guiding spaces.

[0021] The above technical solution arranges multiple battery cells along a first direction to facilitate the installation layout of the battery cells; a flow-guiding space is set between two adjacent battery cells to guide the heat exchange medium to flow downward, facilitating the contact and heat exchange between the heat exchange medium and the battery cells; the nozzle is aligned with the corresponding flow-guiding space to facilitate the spraying of the heat exchange medium into the flow-guiding space and reduce the splashing of the heat exchange medium, so that the heat exchange medium can more uniformly heat the battery cells.

[0022] In some embodiments, the flow space is provided with a flow guide, which has a flow channel to guide the heat exchange medium to the bottom of the box, and the nozzles are positioned directly opposite the corresponding flow channels.

[0023] The above technical solution involves setting up a flow guide and a flow channel within it to guide the heat exchange medium downwards and cover the entire side of the battery cell for heat exchange. The nozzle is aligned with the corresponding flow channel to facilitate the spraying of the heat exchange medium into the channel and reduce splashing, resulting in more uniform heat exchange between the heat exchange medium and the battery cell.

[0024] In some embodiments, the flow guide is plate-shaped, and the flow channel is located in the middle of the flow guide in the thickness direction.

[0025] The above technical solution uses a plate as the guide component and places the flow channel in the middle of the thickness direction of the guide component. This not only facilitates processing and manufacturing, but also increases the contact area between the guide component and the battery cell, so as to better regulate the temperature of the battery cell.

[0026] In some embodiments, the flow guide includes two wall plates spaced apart along its thickness direction, forming a flow channel between the two wall plates, and at least one wall plate is elastically bendable; and / or, at least one wall plate is movably disposed along its thickness direction.

[0027] Through the above technical solution, the current guide can provide expansion and deformation space for the battery cell, so that the battery cell can be charged and discharged well.

[0028] In some embodiments, the flow guide includes a limiting structure for limiting the minimum distance between the two wall panels.

[0029] By using the above technical solution, a limiting structure is set up so that when the battery cell expands and squeezes the guide, causing the wall plate of the guide to deform, the limiting structure can hold the two opposing wall plates together, so that there is a gap between the two wall plates to allow the heat exchange medium to flow. Moreover, it can prevent the guide from being crushed by the battery cell to a certain extent, thus protecting the guide.

[0030] In some embodiments, the limiting structure includes a limiting protrusion disposed on at least one wall panel.

[0031] The above technical solution uses a limiting protrusion, which has a simple structure and is easy to manufacture.

[0032] In some embodiments, the limiting structure includes ribs connecting the two wall panels.

[0033] Through the above technical solution, the limiting structure uses ribs, which can not only support the two wall panels and increase the structural strength of the guide, but also push the wall panels to recover after elastic deformation.

[0034] In some embodiments, the limiting structure is an elastic member.

[0035] Through the above technical solution, the wall plate of the flow guide can better support the corresponding side of the battery cell, which facilitates heat exchange with the battery cell. Moreover, the wall plate elastically supports the side of the battery cell, which better provides space for the expansion and deformation of the battery cell. Furthermore, the elastic force of the limiting structure can also limit the excessive expansion and deformation of the battery cell to a certain extent.

[0036] In some embodiments, the outer surface of the current guide is provided with an insulating layer; and / or, an insulating separator is provided between the current guide and the adjacent battery cell.

[0037] The above technical solution can improve the insulation performance between the current guide and the battery cell. Correspondingly, the current guide can be made of materials with good thermal conductivity, such as metal, to improve the efficiency of heat exchange between the heat exchange medium and the battery cell through the current guide.

[0038] In some embodiments, the inner surface of the flow channel is provided with a turbulence-inducing structure.

[0039] By using the above technical solutions and setting up a turbulence structure, the turbulence of the heat exchange medium in the flow channel can be increased, which facilitates heat exchange between the heat exchange medium and the battery cells.

[0040] In some embodiments, the turbulence structure includes one or more of a protrusion, a groove, and a rib provided on the inner surface of the flow channel.

[0041] The above technical solution involves setting protrusions, grooves, or ribs on the inner surface of the flow channel, resulting in a simple structure that is easy to manufacture.

[0042] In some embodiments, the battery cell has a current guide at least on the side with the largest area.

[0043] By using the above technical solution, a flow guide can be placed on the side with the largest area of ​​the battery cell, which can increase the contact area between the flow guide and the battery cell, so as to better regulate the temperature of the battery cell.

[0044] In some embodiments, the battery device includes an integrated busbar disposed between the battery cell and the top cover, and the integrated busbar has a first opening for the flow of heat exchange medium.

[0045] The above technical solution facilitates the connection and information collection of battery cells. A first opening is provided on the integrated busbar so that the heat exchange medium ejected from the nozzle can flow to the side of the battery cell for heat exchange.

[0046] In some embodiments, the integrated busbar has a first opening at least at the position corresponding to the nozzle.

[0047] The above technical solution allows the heat exchange medium ejected from the nozzle to pass through the integrated busbar and flow to the side of the battery cell, so as to exchange heat with the battery cell.

[0048] In some embodiments, the top surface of the integrated busbar is provided with a groove at a position corresponding to the side of the battery cell, and the groove wall is provided with a first opening.

[0049] By using the above technical solution, the groove can be set to collect the heat exchange medium ejected from the nozzle and guide it to the first opening so that it can flow to the side of the battery cell, facilitating heat exchange with the battery cell.

[0050] In some embodiments, a plurality of first openings are arranged on the groove wall along the extension direction of the groove.

[0051] Through the above technical solution, multiple first openings are arranged on the groove wall to facilitate the flow of heat exchange medium to the side of the battery cell through the first openings, thereby facilitating heat exchange with the battery cell.

[0052] In some embodiments, the housing includes a bottom plate and a support plate, with individual battery cells mounted on the support plate. The bottom plate is spaced below the support plate to form a liquid storage cavity between the bottom plate and the support plate. A second opening communicating with the liquid storage cavity is provided on the support plate, and the second opening is in communication with the accommodating space.

[0053] The above technical solution involves setting a support plate at the bottom of the housing, spaced apart from the base plate, to form a liquid storage chamber between the base plate and the support plate. A second opening is provided on the support plate to facilitate the flow of heat exchange medium into the liquid storage chamber. This effectively reduces the risk of heat exchange medium accumulating at the bottom of the battery cell and causing secondary heating of the bottom of the battery cell, facilitates the circulation of the heat exchange medium, and improves the heat exchange effect.

[0054] In some embodiments, the second opening along the height direction of the housing is offset from the battery cell.

[0055] By using the above technical solution, the second opening is staggered from the battery cell, which facilitates the flow of the heat exchange medium on the side of the battery cell from the second opening to the liquid storage chamber, reducing the risk of heat exchange medium accumulating at the bottom of the battery cell.

[0056] In some embodiments, the bottom surface of the battery cell along the height direction is provided with a pressure relief mechanism, the bottom of the support plate is provided with a pressure relief channel, the pressure relief channel is sealed and isolated from the liquid storage chamber, and a third opening communicating with the pressure relief channel is provided on the support plate at the position corresponding to the pressure relief mechanism.

[0057] By using the above technical solution, a pressure relief mechanism is set at the bottom of the battery cell, and a pressure relief channel and a third opening connected to the pressure relief channel are set at the bottom of the support plate. This can reduce the risk of heat exchange medium entering the pressure relief mechanism and blocking or corroding it. In the event of thermal runaway of the battery cell, the airflow discharged by the pressure relief mechanism can be discharged from the pressure relief channel at the bottom.

[0058] In some embodiments, a guide plate is connected to the bottom of the support plate, a pressure relief channel is formed between the guide plate and the support plate, and a fourth opening is provided on the guide plate corresponding to the position of the second opening.

[0059] Through the above technical solution, a guide plate is set at the bottom of the support plate, and a pressure relief channel is formed between the guide plate and the support plate. The pressure relief channel is made and set, and it can also be well isolated from the liquid storage chamber. A fourth opening is set on the guide plate, which also facilitates the flow of heat exchange medium in the storage space to the liquid storage chamber.

[0060] In some embodiments, the bottom surface of the battery cell along the height direction is provided with a pressure relief mechanism, the bottom of the housing is provided with a pressure relief channel, and the bottom of the housing is provided with an opening corresponding to the position of the pressure relief mechanism to connect to the pressure relief channel.

[0061] By using the above technical solution, a pressure relief mechanism is set at the bottom of the battery cell, and a pressure relief channel and a port connected to the pressure relief channel are set at the bottom of the housing. This can reduce the risk of heat exchange medium entering the pressure relief mechanism and blocking or corroding it. In the event of thermal runaway of the battery cell, the airflow discharged by the pressure relief mechanism can be discharged from the pressure relief channel at the bottom.

[0062] In some embodiments, the first channel includes a liquid supply channel, a plurality of spray channels arranged on the top cover, and a drainage channel connecting the liquid supply channel and each spray channel. Each spray channel is provided with a spray hole, and the liquid supply channel is provided with a liquid inlet structure for the heat exchange medium to enter.

[0063] The above technical solution includes setting up a liquid supply channel and a liquid inlet structure to supply heat exchange medium to the first channel; setting up a spray channel to facilitate spraying heat exchange medium onto the battery cells; when there are multiple battery cells, the spray channel and the position of the spray holes on it can be used to spray heat exchange medium onto each battery cell more evenly, so as to make the overall temperature of the battery device more balanced; and setting up a flow channel to guide the supplied heat exchange medium into the spray channel.

[0064] In some embodiments, the battery device further includes a temperature control system for controlling the temperature of the heat exchange medium, the inlet of the temperature control system extending to the bottom of the housing and used for extracting the heat exchange medium, and the outlet of the temperature control system being connected to the first channel.

[0065] The above technical solution involves setting up a temperature control system to regulate the temperature of the heat exchange medium, which in turn exchanges heat with the battery cells to regulate the temperature of the battery cells, thus facilitating proper charging and discharging of the battery cells.

[0066] In some embodiments, the temperature control system includes a heat exchanger and a circulating pump, the inlet of which extends to the bottom of the housing, the outlet of which is connected to the inlet of the heat exchanger, and the outlet of the heat exchanger is connected to a first channel.

[0067] The above technical solution involves using a circulating pump to extract the heat exchange medium from the bottom of the housing to a heat exchanger. After the heat exchanger adjusts the temperature, the medium enters the first channel and is then sprayed out from the nozzles of the first channel to exchange heat with the battery cells, thereby achieving temperature regulation of the battery cells.

[0068] In some embodiments, the heat exchanger is a liquid-liquid heat exchanger, which has a second channel for the flow of the heat exchange medium, with both ends of the second channel located outside the housing.

[0069] The above technical solution uses a liquid-liquid heat exchanger and sets a second channel in the liquid-liquid heat exchanger for the flow of heat exchange medium, so as to facilitate heat exchange between the heat exchange medium and the heat exchange medium and regulate the temperature of the heat exchange medium; the two ends of the second channel are located outside the box so as to connect to an external heat exchange medium supply system, thereby exchanging heat with the heat exchange medium.

[0070] In some embodiments, the housing is provided with a receiving cavity, and the temperature control system is located in the receiving cavity.

[0071] The above technical solution involves setting up a containment cavity in the enclosure to install the temperature control system, which can be protected by the enclosure.

[0072] Secondly, embodiments of this application provide an electrical device, including the battery device as described in the above embodiments.

[0073] 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

[0074] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or exemplary technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0075] Figure 1This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0076] Figure 2 This is an exploded view of the battery device according to some embodiments of this application;

[0077] Figure 3 This is an exploded structural diagram of a battery cell according to some embodiments of this application;

[0078] Figure 4 This is a bottom view of the top cover in a battery device according to some embodiments of this application;

[0079] Figure 5 This is a bottom view of the top cover in a battery device according to other embodiments of this application;

[0080] Figure 6 This is a cross-sectional view of the spray nozzle portion on the top cover of some embodiments of this application;

[0081] Figure 7 This is a cross-sectional structural schematic diagram of the spray hole portion on the top cover of some other embodiments of this application;

[0082] Figure 8 This is a schematic diagram of the battery device according to some embodiments of this application without the top cover;

[0083] Figure 9 for Figure 8 Enlarged view of section A;

[0084] Figure 10 This is a schematic diagram of the structure of the flow guide in some embodiments of this application;

[0085] Figure 11 This is a top view of the flow guide component in some other embodiments of this application;

[0086] Figure 12 This is a cross-sectional structural schematic diagram of a first type of battery device according to some embodiments of this application;

[0087] Figure 13 This is a cross-sectional view of a second type of battery device according to some embodiments of this application;

[0088] Figure 14 This is a cross-sectional view of a third type of battery device according to some embodiments of this application;

[0089] Figure 15 This is a cross-sectional view of a fourth battery device according to some embodiments of this application;

[0090] Figure 16 This is a cross-sectional view of a fifth type of battery device according to some embodiments of this application;

[0091] Figure 17 This is a cross-sectional view of a sixth battery device according to some embodiments of this application;

[0092] Figure 18 This is a cross-sectional structural schematic diagram of a seventh battery device according to some embodiments of this application.

[0093] The main markings in the attached figures are as follows:

[0094] 11. Vehicle; 111. Controller; 112. Motor;

[0095] 200. Battery assembly; 20. Housing; 21. Top cover; 210. First channel; 2101. First coating; 211. Liquid supply channel; 212. Drainage channel; 213. Spray channel; 214. Spray nozzle; 2141. Lotus leaf effect coating; 215. Liquid inlet structure; 22. Base plate; 23. Frame; 24. Reinforcing beam; 241. Mounting beam; 25. Support plate; 251. Second opening; 252. Third opening; 26. Slat; 27. Guide plate; 271. Fourth opening; 28. Drain pipe; 29. ​​Pressure sensor; 201. Receiving space; 202. Receiving cavity; 203. Liquid storage cavity; 204. Pressure relief channel;

[0096] 300. Battery cell; 301. Current-draining space; 31. Electrode assembly; 311. Main body; 312. Tab; 3121. Positive tab; 3122. Negative tab; 32. Casing; 321. Shell; 322. End cap; 3221. Separator; 3201. Liquid filling hole; 3202. Pressure relief mechanism; 33. Electrode terminal; 331. Positive terminal; 332. Negative terminal; 34. Adapter; 341. Positive adapter; 342. Negative adapter; 35. Insulating film; 36. Support plate;

[0097] 400. Busbar component; 41. Busbar; 42. Integrated busbar; 421. First opening; 422. Groove; 423. Opening;

[0098] 51. Flow guide; 510. Flow channel; 511. Wall panel; 512. Limiting structure; 5121. Rib; 5122. Limiting protrusion; 513. Turbulence structure; 514. Insulation layer; 52. Insulation partition;

[0099] 60. Temperature control system; 61. Circulating pump; 62. Heat exchanger; 620. Liquid-liquid heat exchanger; 621. Second channel;

[0100] X, length direction of the top cover; Y, width direction of the top cover; X1, first length direction; Y1, first width direction; Z1, first height direction; X2, second length direction; Y2, second width direction; Z2, second height direction. Detailed Implementation

[0101] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0102] 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.

[0103] 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. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0104] 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 in any suitable manner.

[0105] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0106] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0107] 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.

[0108] 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). "Several" means one or more, unless otherwise explicitly specified.

[0109] 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", "circumferential", etc., 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 do not 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.

[0110] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the 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.

[0111] In the description of the embodiments of this application, unless otherwise expressly specified and limited, when an element is referred to as "fixed to" or "set on" another element, it may be directly on or indirectly on the other element. When an element is referred to as "connected to" another element, it may be directly connected to or indirectly connected to the other element.

[0112] The battery cells in this application include, but are not limited to, lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells. The shapes of the battery cells include, but are not limited to, cylindrical, flat, cuboid, or other shapes. Battery cells are generally classified according to their packaging method, including but not limited to: cylindrical battery cells, square battery cells, and pouch battery cells.

[0113] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in this application may include a battery device module, a battery device assembly, or a battery device pack. A battery device generally includes a housing for encapsulating one or more battery cells. The housing can, to a certain extent, prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0114] During charging, current converts electrical energy into chemical energy, which is stored in the battery cell, through a chemical reaction between the electrolyte and electrodes. During discharging, this chemical energy is released as electrical energy. This energy conversion process involves energy loss and heat generation. Each battery cell has internal resistance; current flowing through this resistance results in resistive losses, causing internal heating. Furthermore, during charging and discharging, the current flows through the electrode terminals, which generate significant heat. This often causes the electrode terminals to reach temperatures higher than the overall electrode assembly. Heat dissipation from the terminals further increases the temperature of areas closer to the terminals, creating a significant temperature difference within the battery cell. This makes heat dissipation more difficult. Poor internal heat dissipation leads to overheating, negatively impacting the battery's charging and discharging performance.

[0115] Currently, most battery devices use cooling plates on the sides of individual battery cells to cool them. This cooling method requires heat exchange fluid to exchange heat with the corresponding side of the battery cell via the cooling plate, resulting in low heat dissipation efficiency, which can affect the charging and discharging performance of the battery device.

[0116] Based on the above considerations, and to address the problem of poor heat dissipation efficiency in battery devices, this application provides a battery device that uses nozzles in the first channel of the top cover to spray a heat exchange medium onto the individual battery cells. As the heat exchange medium flows downwards, it contacts the individual battery cells, rapidly regulating their temperature and improving their charge-discharge performance, thereby enhancing the overall charge-discharge performance of the battery device. The nozzles have a gradually narrowing inner diameter, reducing the flow area and maintaining laminar flow of the heat exchange medium. This ensures a stable flow rate and reduces flow resistance, minimizing splashing and reducing mist or bubbles caused by splashing. This reduces uneven heat exchange caused by mist or bubbles, resulting in more uniform heat exchange with the battery cells, leading to faster heat dissipation and improved charge-discharge performance of the individual battery cells, ultimately enhancing the overall charge-discharge performance of the battery device.

[0117] The battery cells disclosed in this application can be used in electrical devices that use battery devices as power sources or in various energy storage systems that use battery devices as energy storage elements, such as energy storage power systems for hydropower, thermal power, wind power, and solar power plants. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric bicycles, electric motorcycles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0118] For ease of explanation, an electrical device is provided in one embodiment of this application, which is illustrated using a vehicle as an example.

[0119] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 11 provided in some embodiments of this application. The vehicle 11 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 200 is provided inside the vehicle 11, and the battery device 200 can be located at the bottom, front, or rear of the vehicle 11. The battery device 200 can be used to power the vehicle 11; for example, the battery device 200 can serve as the operating power source for the vehicle 11. The vehicle 11 may also include a controller 111 and a motor 112. The controller 111 is used to control the battery device 200 to supply power to the motor 112, for example, to meet the power needs of the vehicle 11 during starting, navigation, and driving.

[0120] In some embodiments, the battery device 200 can not only serve as the operating power source for the vehicle 11, but also as the driving power source for the vehicle 11, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 11.

[0121] Please refer to Figure 2 This application provides a battery device 200. The battery device 200 may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells 300, which are connected in series, parallel, or mixed connection via a busbar.

[0122] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 300.

[0123] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 300 together. As another example, a battery module can be formed by bundling multiple battery cells 300 together with cable ties.

[0124] In some embodiments, the battery device 200 may be a battery pack, which includes a housing 20 and one or more individual battery cell assemblies housed within the housing 20.

[0125] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing 20 by fixing the battery module in the housing 20.

[0126] As an example, the battery cell assembly can also be housed in the housing 20 by directly fixing multiple battery cells 300 to the housing 20.

[0127] In some embodiments, the housing 20 may include a top cover 21, a frame 23, and a bottom plate 22. The top cover 21 and the bottom plate 22 are respectively connected to opposite sides of the frame 23, so that the interior of the housing 20 forms a closed space as a receiving space 201 to accommodate the battery cells 300. The frame 23 refers to the partial structure forming the peripheral sidewall of the housing 20, the top cover 21 refers to the plate-like structure forming the top of the housing 20, and the bottom plate 22 refers to the plate-like structure forming the bottom of the housing 20.

[0128] In some embodiments, the housing 20 may include a first housing and a second housing, which are fastened together to form a closed space inside the housing 20 to accommodate the battery cells 300. Here, "closed" refers to covering or shutting down, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate of the housing 20. Both the first and second housings may also be hollow structures with an opening on one side, with the opening side of the first housing fitting over the opening side of the second housing.

[0129] In some embodiments, the box body 20 includes a reinforcing beam 24 connected to the frame 23. The reinforcing beam 24 is a structural member provided on the box body 20 to increase the structural strength of the box body 20. The reinforcing beam 24 is provided and connected to the frame 23 to enhance the structural strength of the box body 20.

[0130] In some embodiments, the reinforcing beam 24 includes a mounting beam 241, which is fixedly connected to the frame 23 and is used to connect an external device using the battery device 200 to support the battery device 200 on the device.

[0131] In some embodiments, the reinforcing beam 24 includes an expansion beam installed inside the housing 20 to increase the structural strength of the housing 20, and can also be used to support the battery cell 300 to limit the expansion deformation of the battery cell 300.

[0132] In some embodiments, the expansion beam can also be connected to the bottom plate 22 of the box 20 to better fix the expansion beam in the box 20.

[0133] In some embodiments, the housing 20 may be part of the vehicle's chassis structure. For example, a portion of the housing 20 may be at least a portion of the vehicle's floor, or a portion of the housing 20 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0134] Please see Figure 3 Each battery cell 300 includes one or more electrode assemblies 31, which are components for storing and releasing electrical energy. If there are multiple electrode assemblies 31, they are connected in parallel.

[0135] In some embodiments, the electrode assembly 31 includes a main body 311, on which tabs 312 are provided. The main body 311 is the main part of the electrode assembly 31. The tabs 312 are used in the electrode assembly 31 to connect to an external circuit, allowing current to flow through the main body 311 for charging and discharging. The tabs 312 include a positive tab 3121 and a negative tab 3122, which are used to connect to the positive and negative terminals of the external circuit, respectively. The positive tab 3121 and the negative tab 3122 can be located on the same side of the main body 311, or they can be disposed on different sides of the main body 311, such as on opposite sides of the main body 311.

[0136] In some embodiments, the battery cell 300 includes a housing 32, which is a structure used to provide accommodating space to accommodate the electrode assembly 31 and to support and protect the electrode assembly 31.

[0137] In some embodiments, the housing 32 includes a housing 321 and an end cap 322, with the electrode assembly 31 mounted in the housing 321 and the end cap 322 covering the housing 321.

[0138] End cap 322 refers to a component that covers the opening of housing 321 to isolate the internal environment of battery cell 300 from the external environment. The shape of end cap 322 can be adapted to the shape of housing 321 to fit onto housing 321. Optionally, end cap 322 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 322 is not easily deformed when subjected to compression and impact, so that battery cell 300 can have higher structural strength and improved reliability. The material of end cap 322 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application does not impose any special limitations on it.

[0139] The housing 321 is an assembly used to cooperate with the end cap 322 to form the internal environment of the battery cell 300, wherein the formed internal environment can accommodate the electrode assembly 31, electrolyte, and other components. The housing 321 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 321 can be determined according to the specific shape and size of the battery cell 300. The material of the housing 321 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application does not impose any special limitations on it.

[0140] In some embodiments, the end cap 322 is fitted with an isolator 3221, which can be used to isolate electrical connection components within the housing 321 from the end cap 322 to reduce the risk of short circuits. Exemplarily, the isolator 3221 can be made of plastic, rubber, or the like.

[0141] In some embodiments, the housing 32 is provided with an injection hole 3201. The injection hole 3201 refers to a hole structure for injecting electrolyte into the housing 32. After the electrode assembly 31 is manufactured, it needs to be installed in the housing 321 and electrolyte is injected so that the electrode assembly 31 is immersed in the electrolyte and can fully absorb the electrolyte. The electrolyte can provide some active ions for use as conductive ions during the charging and discharging process; in addition, the electrolyte provides ion channels, or carriers, so that ions can move freely in them to achieve electrical conduction between the electrodes. The injection hole 3201 is provided on the housing 32 to add electrolyte into the housing 32.

[0142] As an example, the injection port 3201 can be provided on the housing 321. Of course, the injection port 3201 can also be provided on the end cap 322.

[0143] In some embodiments, the housing 32 is provided with a pressure relief mechanism 3202, which is used to release internal pressure when the internal pressure or temperature of the battery cell 300 reaches a threshold. The pressure relief mechanism 3202 can be a structure such as an explosion-proof valve or an explosion-proof plate provided on the housing 32.

[0144] In some embodiments, the battery cell 300 includes electrode terminals 33 disposed on the housing 32 and connected to the tabs 312 of the electrode assembly 31. Electrode terminals 33 refer to conductive elements disposed on the housing 32. The connection between electrode terminals 33 and the tabs 312 of the electrode assembly 31 allows for the output of electrical energy from the battery cell 300 or the charging of the battery cell 300. The battery cell 300 typically has two electrode terminals 33: a positive terminal 331 and a negative terminal 332. The positive terminal 331 is connected to the positive tab 3121 of the electrode assembly 31, and the negative terminal 332 is connected to the negative tab 3122 of the electrode assembly 31.

[0145] In some embodiments, the battery cell 300 further includes two adapter pieces 34, each corresponding to one of the two electrode terminals 33. Each tab 312 is connected to its corresponding electrode terminal 33 via the adapter piece 34, facilitating a more secure connection between the tab 312 and the electrode terminal 33. The two adapter pieces 34 are a positive adapter piece 341 and a negative adapter piece 342. The positive adapter piece 341 connects the positive tab 3121 to the positive terminal 331, and the negative adapter piece 342 connects the negative tab 3122 to the negative terminal 332.

[0146] In some embodiments, the battery cell 300 includes an insulating film 35 that surrounds the electrode assembly 31 to bind the electrode assembly 31, thereby facilitating its insertion into the housing 32. The insulating film 35 also protects the electrode assembly 31. The insulating film 35 can be made of insulating materials such as polypropylene or polyethylene to effectively insulate the electrode assembly 31 from the housing 32, thereby reducing the risk of internal short circuits in the battery cell 300.

[0147] In some embodiments, the battery cell 300 further includes a support plate 36, which is mounted in the housing 32 to support the electrode assembly 31. The support plate 36 provides better support for the electrode assembly 31 and reduces deformation of the electrode assembly 31's edges caused by the rounded corners of the housing 32. The support plate 36 can be made of materials such as ceramic, plastic, or silicone.

[0148] Please see Figure 2 and Figure 3In the battery device 200, when there are multiple battery cells 300, these cells can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that some of the battery cells 300 are connected in series while others are connected in parallel. The multiple battery cells 300 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 300 is housed within the housing 20. Alternatively, the battery device 200 can also be composed of multiple battery cells 300 first connected in series, parallel, or in a mixed configuration to form battery device 200 modules, which are then connected in series, parallel, or in a mixed configuration to form a whole and housed within the housing 20. The battery device 200 may also include other structures; for example, it may include a busbar component 400 for electrical connection between the multiple battery cells 300.

[0149] In some embodiments, the busbar component 400 may be a busbar 41, which may be a conductive component such as a copper busbar, an aluminum busbar, or a wire.

[0150] In some embodiments, please refer to Figure 8 The busbar 400 can use an integrated busbar 42. An integrated busbar 42 is a component that integrates multiple electrical connection parts together. The busbar 400 generally includes a signal acquisition component, a support structure, and a conductive structure. The signal acquisition component can be a flexible printed circuit board, a printed circuit board, a flexible flat cable, etc., used to acquire information such as battery temperature and voltage and transmit it to the battery management system. The support structure can be an insulating structure such as a plastic or ceramic component, serving to support and fix the signal acquisition component and other components, ensuring the stability and reliability of the entire system. The conductive structure can be a conductive structure such as a copper busbar or an aluminum busbar, used to achieve high-voltage series and parallel connections between battery cells 300, possessing good conductivity and mechanical strength.

[0151] Please see Figure 2 The housing 20 has a length direction, a width direction, and a height direction. The length direction of the housing 20 is a first length direction X1, the width direction is a first width direction Y1, and the height direction is a first height direction Z1. Since the housing 20 defines the shape of the battery device 200, the first length direction X1 is the length direction of the battery device 200, the first width direction Y1 is the width direction of the battery device 200, and the first height direction Z1 is the height direction of the battery device 200.

[0152] Please see Figure 3The battery cell 300 has a length direction, a width direction, and a height direction. The length direction of the battery cell 300 is the second length direction X2, the width direction is the second width direction Y2, and the height direction is the second height direction Z2. Since the outer casing 32 defines the shape of the battery cell 300, the second length direction X2 is the length direction of the outer casing 32, the second width direction Y2 is the width direction of the outer casing 32, and the second height direction Z2 is the height direction of the outer casing 32.

[0153] The second length direction X2 of the battery cell 300 and the first length direction X1 of the housing 20 can be set to be the same or different, such as the second length direction X2 of the battery cell 300 being parallel to the first width direction Y1 of the housing 20; similarly, the second width direction Y2 of the battery cell 300 and the first width direction Y1 of the housing 20 can be set to be the same or different, such as the second width direction Y2 of the battery cell 300 being parallel to the first length direction X1 of the housing 20. For ease of description, the second height direction Z2 of the battery cell 300 and the first height direction Z1 of the housing 20 will be collectively referred to as the height direction below.

[0154] Please see Figures 2 to 18 According to some embodiments of this application, a battery device 200 is provided, including a housing 20 and a plurality of battery cells 300. The housing 20 has a receiving space 201 and includes a top cover 21 located on top of the receiving space 201. The plurality of battery cells 300 are installed in the receiving space 201. The top cover 21 is provided with a first channel 210 for the flow of heat exchange medium, and the side wall of the first channel 210 facing the battery cells 300 is provided with nozzles 214, which communicate with the receiving space 201; the inner diameter of the nozzles 214 gradually decreases from the top cover 21 to the bottom of the housing 20.

[0155] The top cover 21 refers to the part of the structure on the box 20 located on top of the accommodating space 201.

[0156] The first channel 210 refers to a space on the top cover 21 that allows liquid to flow. As an example, a pipe can be provided on the top cover 21, forming the first channel 210 inside the pipe. As an example, a grooved cover plate can be fixed to the top cover 21, connected to the top cover 21, and the top cover 21 can be placed over the grooved structure to form the first channel 210 for liquid flow. As an example, the top cover 21 can also use a multi-layer plate structure to form the first channel 210 inside the top cover 21. As an example, if the top cover 21 is cast, the first channel 210 can be directly cast into the top cover 21. As an example, if the top cover 21 is injection molded, the first channel 210 can be directly injection molded into the top cover 21.

[0157] Heat exchange medium refers to a medium that can exchange heat, such as liquid or gas.

[0158] In some embodiments, the heat exchange medium can be an insulating liquid, which refers to a liquid material with insulating properties that can be used to isolate conductors with different potentials; it is also known as insulating oil. As an example, the heat exchange medium can be a synthetic hydrocarbon oil with high insulation and low viscosity to ensure both heat exchange efficiency and insulation performance.

[0159] In some embodiments, when the conductive components and battery cells 300 in the housing 20 are insulated, the heat exchange medium may also be a conductive liquid such as water.

[0160] The nozzle 214 refers to the orifice structure used to guide the liquid spraying out. As an example, a nozzle can be installed on the sidewall of the first channel 210, and the internal orifice structure of the nozzle can be used as the nozzle 214. Alternatively, the orifice structure can be directly fabricated on the sidewall of the first channel 210 to serve as the nozzle 214. Providing a through hole on the sidewall of the first channel 210 to form the nozzle 214 results in a simple structure that is easy to manufacture. The nozzle 214 is provided on the sidewall of the first channel 210 facing the battery cell 300, and the nozzle 214 communicates with the receiving space 201 to guide the heat exchange medium from the nozzle 214 into the receiving space 201.

[0161] The direction from the top cover 21 to the bottom of the box 20 refers to the direction parallel to the height direction and from top to bottom.

[0162] The term "gradually narrowing inner diameter" in nozzle 214 refers to the gradual change in the inner diameter of nozzle 214, decreasing from top to bottom. With this gradual narrowing, the velocity of the heat exchange medium passing through nozzle 214 gradually increases, allowing the heat exchange medium to exit nozzle 214 at a faster velocity and maintaining laminar flow.

[0163] In the technical solution of this application embodiment, a nozzle 214 is provided on the first channel 210 of the top cover 21 to spray a heat exchange medium onto the battery cell 300. As the heat exchange medium flows downwards, it contacts the battery cell 300 to quickly regulate the temperature of the battery cell 300, improving its charging and discharging performance, and thus enhancing the charging and discharging performance of the battery device 200. The inner diameter of the nozzle 214 is gradually narrowing, thereby gradually reducing the flow area. This allows the sprayed heat exchange medium to maintain a laminar flow state, ensuring a stable flow rate and reducing flow resistance, thus minimizing splashing. This reduces mist or bubbles generated by splashing, reducing uneven heat exchange caused by mist or bubbles, and allowing for more uniform heat exchange between the heat exchange medium and the battery cell 300. In addition, since the top cover 21 is provided with a first channel 210 and a nozzle 214 to spray heat exchange medium into the housing space 201 to exchange heat with the battery cell 300, there is no need to set up a mica plate to isolate the heat exchange between the top of the housing 20 and the external environment, thus simplifying the structure of the battery device 200.

[0164] In some embodiments, please refer to Figures 4 to 7 The line formed by the intersection of the inner surface of the nozzle 214 and the cross section where the center line of the nozzle 214 is located is arc-shaped.

[0165] The cross section containing the centerline of the nozzle 214 refers to the cross section that is parallel to and passes through the centerline of the nozzle 214. Correspondingly, the intersection of the inner surface of the nozzle 214 and this cross section is a line. If this line is set to be arc-shaped, then the inner surface of the nozzle 214 is a gradually narrowing arc surface.

[0166] By using the above technical solution, the inner surface of the nozzle 214 is made into an arc shape, which can further reduce the flow resistance, better maintain the laminar flow state of the heat exchange medium, and make the flow rate of the sprayed heat exchange medium stable.

[0167] In some embodiments, the inner surface of the nozzle 214 may also be tapered to achieve a gradually narrowing inner diameter of the nozzle 214.

[0168] In some embodiments, please refer to Figure 7 The inner surface of the nozzle 214 is provided with a lotus leaf effect coating 2141.

[0169] Lotus leaf effect coating 2141 refers to a functional coating prepared by simulating the microstructure and properties of the lotus leaf surface, which has the characteristics of superhydrophobicity and self-cleaning. The liquid can be made using the material used to make lotus leaf effect coating 2141, and then applied to the inner surface of the nozzle 214 by spraying or dip coating process, and cured to form lotus leaf effect coating 2141.

[0170] As an example, the lotus effect coating 2141 can be a coating made of perfluorooctyltriethoxysilane (PFOTES), which has strong superhydrophobicity and high chemical stability. As another example, the lotus effect coating 2141 can be a coating made of polytetrafluoroethylene (PTFE), which has extremely low surface energy, high temperature resistance, chemical corrosion resistance, and is suitable for harsh environments.

[0171] By using the above technical solution, a lotus leaf effect coating 2141 is provided on the inner surface of the nozzle 214, which can reduce the flow resistance of the heat exchange medium, reduce droplet adhesion and accumulation, enable the heat exchange medium to maintain a laminar flow state better, and make the flow rate of the sprayed heat exchange medium stable.

[0172] In some embodiments, please refer to Figure 6 The roughness of the inner surface of the nozzle 214 is less than or equal to 0.2 mm. For example, the roughness of the inner surface of the nozzle 214 can be 0.2 mm, 0.1 mm, 0.05 mm, 0.01 mm, 0.005 mm, 0.001 mm, etc.

[0173] As an example, the inner surface of the nozzle 214 can be deburred by sandblasting, grinding or other processes to improve the smoothness of the inner surface of the nozzle 214, so that the roughness of the inner surface of the nozzle 214 is less than or equal to 0.2 mm.

[0174] By using the above technical solution, the inner surface roughness of the nozzle 214 is set to be less than or equal to 0.2 mm, which can make the inner surface of the nozzle 214 smoother, reduce the flow resistance of the heat exchange medium, reduce turbulence, make the heat exchange medium better maintain a laminar flow state, and make the flow rate of the sprayed heat exchange medium stable.

[0175] In some embodiments, please refer to Figure 2 and Figure 6 The nozzle 214 is a round hole. The diameter D1 of the nozzle 214 inlet ranges from 2mm to 10mm, the diameter D2 of the nozzle 214 outlet ranges from 0.5mm to 2mm, and the length H of the nozzle 214 ranges from 2mm to 5mm.

[0176] A round hole is a hole whose cross-section is circular along the vertical depth direction. The nozzle 214 uses a round hole for ease of manufacturing.

[0177] The nozzle 214 inlet refers to the end of the nozzle 214 that faces away from the battery cell 300. The diameter of the nozzle 214 inlet ranges from 2mm to 10mm, such as the diameter D1 of the nozzle 214 inlet, which can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc.

[0178] The nozzle 214 outlet refers to the end of the nozzle 214 closest to the battery cell 300. The diameter of the nozzle 214 outlet ranges from 0.5mm to 2mm, such as the diameter D2 of the nozzle 214 outlet, which can be 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, etc.

[0179] The length H of the nozzle 214 refers to the length of the nozzle 214 along its centerline. The length of the nozzle 214 ranges from 2mm to 5mm, such as 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm, 5mm, etc.

[0180] The above technical solutions optimize the structural design of the nozzle 214, further reduce flow resistance and turbulence, better maintain the laminar flow state of the heat exchange medium, and make the flow velocity of the jet heat exchange medium stable.

[0181] In some embodiments, the diameter D1 of the nozzle 214 inlet ranges from 3 mm to 4 mm, and the diameter D2 of the nozzle 214 outlet ranges from 0.8 mm to 1.5 mm.

[0182] The above technical solutions can better optimize the structural design of the nozzle 214, reduce flow resistance, and enable the heat exchange medium to maintain a laminar flow state.

[0183] In some embodiments, please refer to Figure 7 The inner surface of the first channel 210 is provided with a first coating 2101 having a lotus leaf effect. The first coating 2101 having a lotus leaf effect on the inner surface of the first channel 210 can reduce the flow resistance of the heat exchange medium, reduce droplet adhesion and accumulation, and facilitate the flow of the heat exchange medium in the first channel 210.

[0184] In some embodiments, please refer to Figure 6 The roughness of the inner surface of the first channel 210 is less than or equal to 0.2 mm. For example, the roughness of the inner surface of the first channel 210 can be 0.2 mm, 0.1 mm, 0.05 mm, 0.01 mm, 0.005 mm, 0.001 mm, etc.

[0185] As an example, the inner surface of the first channel 210 can be deburred by sandblasting, grinding or other processes to improve the smoothness of the inner surface of the first channel 210, so that the roughness of the inner surface of the first channel 210 is less than or equal to 0.2mm.

[0186] By using the above technical solution, the inner surface roughness of the first channel 210 is set to be less than or equal to 0.2 mm, which can make the inner surface of the first channel 210 smoother, reduce the flow resistance of the heat exchange medium, and facilitate the flow of the heat exchange medium in the first channel 210.

[0187] In some embodiments, please refer to Figure 2 , Figure 8 , Figures 12 to 18 The battery device 200 includes a plurality of battery cells 300 arranged along a first direction, and a flow-guiding space 301 is provided between two adjacent battery cells 300 along the first direction, and the nozzle 214 is set directly opposite the corresponding flow-guiding space 301.

[0188] The first direction can be parallel to the first length direction X1 of the box 20. The first direction can also be parallel to the first width direction Y1 of the box 20. The first direction can also be inclined to the first length direction X1 of the box 20. The first direction can also be inclined to the first width direction Y1 of the box 20.

[0189] The multiple battery cells 300 can be arranged along the first direction. Of course, the multiple battery cells 300 of the battery device 200 can also be arranged in an array along the first direction and in a direction perpendicular to the first direction.

[0190] The flow-guiding space 301 refers to the spacing between adjacent battery cells 300 in the first direction.

[0191] In the first direction, two adjacent battery cells 300 are spaced apart so that the space between the two adjacent battery cells 300 forms a flow-guiding space 301.

[0192] The nozzle 214 is positioned directly above the corresponding flow space 301, meaning that the nozzle 214 is located directly above the flow space 301 and the centerline of the nozzle 214 points towards the flow space 301. As a result, the direction of the heat exchange medium ejected from the nozzle 214 is also towards the flow space 301. Accordingly, the nozzle 214 ejects the heat exchange medium into the flow space 301, which can reduce or minimize the splashing of the heat exchange medium.

[0193] Through the above technical solution, multiple battery cells 300 are arranged along the first direction to facilitate the installation layout of the battery cells 300; a flow-guiding space 301 is set between two adjacent battery cells 300 to guide the heat exchange medium to flow downward, so as to facilitate the contact and heat exchange between the heat exchange medium and the battery cells 300; the nozzle 214 is aligned with the corresponding flow-guiding space 301 to facilitate the spraying of the heat exchange medium into the flow-guiding space 301 and reduce the splashing of the heat exchange medium, so that the heat exchange medium can more evenly exchange heat with the battery cells 300.

[0194] In some embodiments, please refer to Figures 8 to 18The flow space 301 is provided with a flow guide 51, and the flow guide 51 is provided with a flow channel 510 to guide the heat exchange medium to the bottom of the box 20. The nozzle 214 is set directly opposite the corresponding flow channel 510.

[0195] The flow guide 51 refers to a structural component that guides the flow of liquid. The flow channel 510 refers to a channel or groove structure provided on the flow guide 51 for the flow of liquid. For example, it can be a hole provided inside the flow guide 51 to allow liquid to flow within the hole; or it can be a groove provided on the side of the flow guide 51 to allow liquid to flow within the groove. The material of the flow guide 51 can be plastic, metal, ceramic, glass, etc. The shape of the flow guide 51 can be plate-shaped, cylindrical, prismatic, etc. The flow guide 51 can also be shaped to fit the shape of the battery cell 300 so that the flow guide 51 is attached to the side of the battery cell 300, or it can be cylindrical to fit the shape of the battery cell 300 so that it is fitted onto the battery cell 300.

[0196] Since the flow channel 510 in the flow guide 51 guides the sprayed heat exchange medium to the bottom of the box 20, the overall flow direction of the flow channel 510 extends from the top of the box 20 to the bottom of the box 20. For example, the flow channel 510 can be extended along the height direction or inclined to the height direction in order to guide the sprayed heat exchange medium to flow to the bottom of the box 20.

[0197] The nozzle 214 is positioned directly above the flow channel 510, with its centerline pointing towards the flow channel 510. Consequently, the heat exchange medium ejected from the nozzle 214 is directed toward the flow channel 510. This reduces or minimizes the splashing of the heat exchange medium.

[0198] Through the above technical solution, a flow guide 51 is set, and a flow channel 510 is set in the flow guide 51 to guide the heat exchange medium to flow downward and cover the entire side of the battery cell 300 so as to exchange heat with the battery cell 300; the nozzle 214 is aligned with the corresponding flow channel 510 to facilitate the spraying of the heat exchange medium into the flow channel 510 and reduce the splashing of the heat exchange medium, so that the heat exchange medium can more evenly exchange heat with the battery cell 300.

[0199] In some embodiments, since the battery cell 300 is installed in the housing 20, there will be some gaps on its side, and the sprayed heat exchange medium can also flow through these gaps to the bottom of the housing 20. In this case, the guide 51 may not be provided.

[0200] In some embodiments, please refer to Figures 8 to 18 The flow channel 510 extends along the height direction.

[0201] The flow channel 510 is extended along the height direction to shorten the path of the flow channel 510 guiding the heat exchange medium to the bottom of the box 20, reduce the resistance to the flow of the heat exchange medium, and better guide the heat exchange medium to the bottom of the box 20.

[0202] In some embodiments, please refer to Figures 8 to 18 The guide member 51 is plate-shaped, and the flow channel 510 is located in the middle of the thickness direction of the guide member 51.

[0203] Plate-like refers to a structural shape that is flat overall and whose thickness is much smaller than its length and width.

[0204] The flow channel 510 being located in the middle of the thickness direction of the flow guide 51 means that the flow channel 510 has sidewalls on both sides along the thickness direction of the flow guide 51. This structure can define the shape of the flow channel 510 through the sidewalls to guide the flow of the heat exchange medium. Moreover, the flow guide 51 can be disposed between two adjacent battery cells 300, so that the two battery cells 300 respectively contact the sidewalls on both sides of the flow channel 510 to exchange heat with the adjacent battery cells 300.

[0205] Through the above technical solution, the flow guide 51 uses a plate and the flow channel 510 is located in the middle of the thickness direction of the flow guide 51. This not only facilitates processing and manufacturing, but also increases the contact area between the flow guide 51 and the battery cell 300, so as to better regulate the temperature of the battery cell 300.

[0206] In some embodiments, a groove structure may be provided on the side of the flow guide 51 facing the battery cell 300 to form a flow channel 510 in cooperation with the side of the battery cell 300 for the flow of heat exchange medium. During the flow of the heat exchange medium in the groove structure, it will directly contact the side of the battery cell 300 to exchange heat with the battery cell 300.

[0207] The battery cell 300 typically contains a certain amount of gas. When the battery cell 300 is charged or discharged, the electrolyte solution undergoes gas generation or absorption reactions. The generation of these gases increases the internal gas pressure of the battery cell 300, causing it to expand and deform. During charging or discharging, the positive and negative electrode materials undergo chemical reactions to form new compounds. These chemical reactions are accompanied by volume changes, leading to volume changes in the internal materials of the battery cell 300, which also causes the battery assembly 200 to expand and deform. In other words, the battery cell 300 expands and deforms during charging and discharging.

[0208] In some embodiments, the flow guide 51 may also be made using multiple pipe fittings.

[0209] In some embodiments, please refer to Figures 8 to 18The flow guide 51 includes two wall plates 511 spaced apart along its thickness direction, with a flow channel 510 formed between the two wall plates 511, and at least one wall plate 511 is elastically bendable.

[0210] The wall panel 511 refers to the side walls of the flow channel 510 along the thickness direction of the guide member 51. The wall panel 511 is elastically bendable, meaning that it will undergo elastic deformation when subjected to external force. It can be one wall panel 511 or both wall panels 511 that are elastically bendable. When one wall panel 511 is elastically bendable and the other wall panel 511 is a rigid structure, the structural strength of the guide member 51 can be higher, thereby improving the structural strength of the battery device 200. When both wall panels 511 are elastically bendable, the guide member 51 is more easily deformed by the compression of the battery cell 300, thus providing better expansion and deformation space for the battery cell 300.

[0211] If at least one wall panel 511 is configured to be elastically bendable, the flow channel 510 can provide expansion and deformation space for the battery cell 300 so that the battery cell 300 can be properly charged and discharged.

[0212] In some embodiments, please refer to Figures 8 to 18 The flow guide 51 includes two wall plates 511 spaced apart along its thickness direction, with a flow channel 510 formed between the two wall plates 511, and at least one wall plate 511 is movably disposed along its thickness direction.

[0213] At least one wall panel 511 is movable in the thickness direction, meaning that at least one of the wall panels 511 on opposite sides of the flow channel 510 can move toward the other wall panel 511.

[0214] If at least one wall panel 511 is movably arranged along the thickness direction, the flow channel 510 can provide expansion and deformation space for the battery cell 300 so that the battery cell 300 can be properly charged and discharged.

[0215] In some embodiments, at least one wall panel 511 of the flow guide 51 may be elastically bent and at least one wall panel 511 may be movably arranged in the thickness direction to better provide expansion and deformation space for the battery cell 300.

[0216] In some embodiments, please refer to Figures 8 to 14 The guide member 51 is provided with a limiting structure 512 for limiting the minimum distance between the two wall panels 511.

[0217] The limiting structure 512 refers to the structural component located in the flow channel 510. When the two wall plates 511 of the flow guide 51 are squeezed and brought closer to each other, the limiting structure 512 holds the two wall plates 511 together, so that there is a certain gap between the two wall plates 511. To a certain extent, this can prevent the flow guide 51 from being crushed and blocked from the flow channel 510, and facilitate the flow of heat exchange medium in the flow channel 510.

[0218] With the above technical solution, a limiting structure 512 is set up so that when the battery cell 300 expands and squeezes the flow guide 51, causing the wall plate 511 of the flow guide 51 to deform, the limiting structure 512 can hold the two opposing wall plates 511, so that there is a gap between the two wall plates 511 to facilitate the flow of heat exchange medium. Moreover, it can prevent the flow guide 51 from being crushed by the battery cell 300 to a certain extent, so as to protect the flow guide 51 well.

[0219] Crushing is a type of material failure. It refers to the phenomenon where, under pressure, a material undergoes plastic deformation, leading to localized compressive deformation and ultimately, internal structural failure. This failure mode typically occurs in the central part of the material and is often accompanied by deformation and shape changes, but it does not necessarily result in complete fracture. Different materials exhibit different failure modes under different loads, such as tensile fracture, shear fracture, and fatigue fracture.

[0220] In some embodiments, please refer to Figure 13 The limiting structure 512 includes a limiting protrusion 5122 provided on at least one wall panel 511.

[0221] The limiting protrusion 5122 refers to a protruding structure located in the flow channel 510. The limiting protrusion 5122 can be hemispherical, columnar, dotted, frustum-shaped, etc. The limiting protrusion 5122 can be integrally formed with the wall panel 511, or it can be manufactured separately and then welded or bonded to the wall panel 511. The limiting protrusion 5122 can be made of materials such as metal, ceramic, plastic, and rubber.

[0222] The limiting protrusion 5122 can be set on one wall panel 511, or the limiting protrusion 5122 can be set on both wall panels 511.

[0223] The above technical solution uses the limiting protrusion 5122, which has a simple structure and is easy to manufacture.

[0224] In some embodiments, please refer to Figure 11 and Figure 14 The limiting structure 512 includes a rib 5121 that connects the two wall panels 511.

[0225] Rib 5121 refers to a flat rib or rib structure. Ribs 5121 can be made of materials such as metal, plastic, and rubber.

[0226] The rib 5121 connecting the two wall panels 511 means that the two opposite sides of the rib 5121 in the width direction are respectively connected to the two wall panels 511.

[0227] Through the above technical solution, the limiting structure 512 uses ribs 5121, which can not only support the two wall panels 511 and increase the structural strength of the guide 51, but also push the wall panel 511 to recover after elastic deformation.

[0228] In some embodiments, ribs 5121 and limiting protrusions 5122 may be provided simultaneously in the flow channel 510 so that the ribs 5121 and the limiting protrusions 5122 cooperate to limit the distance between the two wall panels 511.

[0229] In some embodiments, please refer to Figure 11 and Figure 14 The ribs 5121 are inclined in the width direction to the wall panel 511.

[0230] The setting of the rib 5121 being inclined in the width direction to the wall panel 511 means that the width direction of the rib 5121 is inclined to the surface where the wall panel 511 is located.

[0231] The ribs 5121 are inclined to the wall panel 511. When the wall panel 511 is compressed, the force exerted on the ribs 5121 will be inclined in the width direction of the ribs 5121. This can reduce the resistance of the ribs 5121 on the wall panel 511, facilitate the deformation of the wall panel 511, and thus better provide expansion and deformation space for the battery cell 300. The reverse force of the ribs 5121 and the width of the ribs 5121 can limit the deformation of the wall panel 511 and prevent the guide component 51 from being crushed by the battery cell 300 to a certain extent.

[0232] In some embodiments, one or more ribs 5121 may be provided, such as two, three, or four. When there are multiple ribs 5121, adjacent ribs 5121 are spaced apart.

[0233] The flow guide 51 has height, length, and thickness. Correspondingly, the flow guide 51 has a height direction, a length direction, and a thickness direction. The flow guide 51 is installed in the housing 20. The height direction of the flow guide 51 is consistent with the first height direction Z1 of the housing 20. The thickness direction of the flow guide 51 can be parallel to the first width direction Y1 of the housing 20; alternatively, it can be perpendicular or inclined to the first width direction Y1. The length direction of the flow guide 51 can be parallel to the first length direction X1 of the housing 20; alternatively, it can be perpendicular or inclined to the first length direction X1.

[0234] In some embodiments, please refer to Figure 11 and Figure 14 In the projection along the height direction: the projected area of ​​each rib 5121 is smaller than the projected area of ​​the flow channel 510, so that each rib 5121 will not block the flow channel 510, allowing the flow channel 510 to guide the heat exchange medium to the bottom of the housing 20. Please refer to Figure 14 If the length direction of rib 5121 is perpendicular to the height and thickness directions of the guide member 51, that is, if the length direction of rib 5121 is parallel to the length direction of the guide member 51, and the projected area of ​​rib 5121 is set smaller than the projected area of ​​flow channel 510, then rib 5121 will not block flow channel 510. Similarly, if the length direction of rib 5121 is inclined to the height, thickness, and length directions of the guide member 51, and the projected area of ​​rib 5121 is set smaller than the projected area of ​​flow channel 510, then rib 5121 will also not block flow channel 510. Please refer to [link / reference]. Figure 11 For example, if the length direction of the rib 5121 is parallel to the height direction of the guide 51, and the projected area of ​​the rib 5121 is set to be smaller than the projected area of ​​the flow channel 510, then the rib 5121 will not block the flow channel 510.

[0235] In some embodiments, the limiting structure 512 is an elastic member.

[0236] Elastic components refer to structural parts that possess elasticity. Elastic components can be made from materials such as polyphosphazene elastomer, hydrogenated nitrile rubber, thermoplastic polyurethane (TPU), polyetheramide (PEBA), polyamide elastomer (PAE), and polypropylene elastomer (TPO).

[0237] As an example, if the limiting structure 512 includes a rib 5121, the rib 5121 can be an elastic member. As an example, if the limiting structure 512 includes a limiting protrusion 5122, the limiting protrusion 5122 can be an elastic member.

[0238] Through the above technical solution, the wall plate 511 of the flow guide 51 can better abut against the corresponding side of the battery cell 300, which facilitates heat exchange with the battery cell 300. Moreover, the wall plate 511 elastically abuts against the side of the battery cell 300, which better provides expansion and deformation space for the battery cell 300. Furthermore, the elastic force of the limiting structure 512 can also limit the excessive expansion and deformation of the battery cell 300 to a certain extent.

[0239] In some embodiments, after the two wall panels 511 are processed, a limiting structure 512 can be injection molded between them to connect the two wall panels 511, thereby forming a flow guide 51.

[0240] In some embodiments, a limiting structure 512 may also be bonded between the two wall panels 511.

[0241] In some embodiments, please refer to Figure 11 An insulating layer 514 is provided on the outer surface of the flow guide 51.

[0242] Insulating layer 514 refers to a film or coating with insulating properties.

[0243] By providing an insulating layer 514 on the outer surface of the flow guide 51, the insulation performance between the flow guide 51 and the battery cell 300 can be improved. Accordingly, the flow guide 51 can be made of metal, such as aluminum, aluminum alloy, copper, copper alloy, or other materials with good thermal conductivity, so as to improve the efficiency of heat exchange between the heat exchange medium and the battery cell 300 through the flow guide 51.

[0244] In some embodiments, the flow guide 51 may also be made of a material that has insulating properties and good thermal conductivity, such as thermally conductive plastic.

[0245] In some embodiments, please refer to Figure 9 An insulating partition 52 is provided between the current guide 51 and the adjacent battery cell 300.

[0246] Insulating partition 52 refers to a plate made of insulating material.

[0247] The above technical solution can improve the insulation performance between the flow guide 51 and the battery cell 300. Accordingly, the flow guide 51 can be made of metal, such as aluminum, aluminum alloy, copper, copper alloy, etc., which have good thermal conductivity, so as to improve the efficiency of heat exchange between the heat exchange medium and the battery cell 300 through the flow guide 51.

[0248] In some embodiments, an insulating layer 514 may be provided on the outer surface of the current guide 51, and an insulating partition 52 may be provided between the current guide 51 and the adjacent battery cell 300 to better improve the insulation performance between the current guide 51 and the battery cell 300.

[0249] In some embodiments, please refer to Figure 15 The inner surface of the flow channel 510 is provided with a turbulence structure 513.

[0250] The turbulence structure 513 refers to a structure that can impede the flow of the heat exchange medium.

[0251] By using the above technical solution, the turbulence structure 513 can be set to increase the turbulence of the heat exchange medium in the flow channel 510, which facilitates heat exchange between the heat exchange medium and the battery cell 300.

[0252] In some embodiments, please refer to Figure 15 The turbulence structure 513 includes one or more of the following: protrusions, recesses, and ribs provided on the inner surface of the flow channel 510.

[0253] A bump refers to a dot-like structure protruding from the inner surface of the flow channel 510. Bumps can be manufactured separately and then bonded or welded to the inner surface of the flow channel 510. Alternatively, bumps can be integrally formed with the flow guide 51.

[0254] A recessed groove refers to a groove-like structure with a recess on the inner surface of the flow channel 510.

[0255] A raised rib refers to a long, strip-shaped rib structure that protrudes from the inner surface of the flow channel 510. Raised ribs can be manufactured separately and then bonded or welded to the inner surface of the flow channel 510. Alternatively, raised ribs can be integrally formed with the flow guide 51.

[0256] The above technical solution provides a simple structure and is easy to manufacture by setting protrusions, grooves or ribs on the inner surface of the flow channel 510.

[0257] In some embodiments, the battery cell 300 has a flow guide 51 on at least the side with the largest area.

[0258] The side with the largest area is also called the large surface. The fact that the battery cell 300 has a guide member 51 on at least one side with the largest area means that the battery cell 300 has a guide member 51 on the side with the large surface, and the other sides of the battery cell 300 may or may not have a guide member 51.

[0259] By using the above technical solution, a flow guide 51 is provided on the side with the largest area of ​​the battery cell 300, which can increase the contact area between the flow guide 51 and the battery cell 300, so as to better regulate the temperature of the battery cell 300.

[0260] In some embodiments, the current guide 51 can be bonded to the side of the battery cell 300 via an adhesive layer to facilitate the installation and fixation of the current guide 51. In some embodiments, the current guide 51 can also be in direct contact with the side of the battery cell 300, such as by using the housing 20 to support the battery cell 300 and the current guide 51.

[0261] In some embodiments, each side of the battery cell 300 is provided with a flow guide 51.

[0262] The fact that each side of the battery cell 300 is provided with a flow guide 51 means that each side of the battery cell 300 is provided with a flow guide 51.

[0263] A flow guide 51 is provided on each side of the battery cell 300 to increase the contact area between the flow guide 51 and the battery cell 300, so as to better regulate the temperature of the battery cell 300.

[0264] In some embodiments, the flow guide 51 is spaced apart from the bottom of the housing 20.

[0265] The flow guide 51 is spaced apart from the bottom of the housing 20, so there will be a gap between the lower end of the flow guide 51 and the bottom of the housing 20. In this way, the heat exchange medium that flows from the flow channel 510 of the flow guide 51 to the bottom of the housing 20 can easily flow out of the flow guide 51 and flow at the bottom of the housing 20, so that the liquid height of the heat exchange medium at the bottom of the housing 20 is more uniform, which facilitates the heat exchange medium to dissipate heat to the bottom of the battery cell 300.

[0266] In some embodiments, please refer to Figures 8 to 18 The battery device 200 includes an integrated busbar 42, which is located between the battery cell 300 and the top cover 21. The integrated busbar 42 has a first opening 421 for the flow of heat exchange medium.

[0267] An integrated busbar 42 is set up and positioned between the battery cell 300 and the top cover 21 to connect the battery cell 300 and collect the status information of the battery cell 300.

[0268] The first opening 421 refers to the through-hole structure provided on the integrated busbar 42. With the first opening 421 provided on the integrated busbar 42, the heat exchange medium ejected from the nozzle 214 can pass through the integrated busbar 42 through the first opening 421 to flow to the side of the battery cell 300, thereby exchanging heat with the battery cell 300.

[0269] The above technical solution facilitates the connection and information collection of the battery cell 300. A first opening 421 is provided on the integrated busbar 42 so that the heat exchange medium ejected from the nozzle 214 can flow to the side of the battery cell 300 for heat exchange with the battery cell 300.

[0270] In some embodiments, please refer to Figures 8 to 18 The integrated busbar 42 has a first opening 421 at least at the position corresponding to the nozzle 214. That is, along the height direction, the integrated busbar 42 has a first opening 421 at the position corresponding to the nozzle 214. Of course, the position of some of the first openings 421 on the integrated busbar 42 can also be offset from the nozzle 214 along the height direction.

[0271] The above technical solution allows the heat exchange medium ejected from the nozzle 214 to flow through the integrated busbar 42 to the side of the battery cell 300 for heat exchange with the battery cell 300.

[0272] In some embodiments, please refer to Figures 8 to 18 The top surface of the integrated busbar 42 is provided with a groove 422 at the position corresponding to the side of the battery cell 300, and the groove wall of the groove 422 is provided with a first opening 421.

[0273] The groove 422 refers to the groove structure that is recessed on the integrated busbar 42 in the direction of the battery cell 300, and the groove 422 is located at the corresponding position on the side of the battery cell 300.

[0274] The groove wall of groove 422 refers to the wall surface that forms groove 422.

[0275] By using the above technical solution, the groove 422 can collect the heat exchange medium ejected from the nozzle 214 and guide it to the first opening 421 so that it can flow to the side of the battery cell 300, which facilitates heat exchange with the battery cell 300.

[0276] In some embodiments, since a drainage space 301 is provided on the side of the battery cell 300, the groove 422 is located at the position corresponding to the drainage space 301 along the height direction.

[0277] In some embodiments, a plurality of first openings 421 are arranged on the groove wall of the groove 422 along the extending direction of the groove 422.

[0278] Multiple refers to two or more items.

[0279] The extension direction of groove 422 refers to the length direction of groove 422, which is also the direction of extension parallel to the sidewall of groove 422.

[0280] Through the above technical solution, multiple first openings 421 are arranged on the groove wall of the groove 422, so that the heat exchange medium can flow through the first openings 421 to the side of the battery cell 300, and facilitate heat exchange with the battery cell 300.

[0281] In some embodiments, please refer to Figures 12 to 16 and Figure 18 The housing 20 includes a bottom plate 22 and a support plate 25. The battery cell 300 is mounted on the support plate 25. The bottom plate 22 is spaced below the support plate 25 so that a liquid storage cavity 203 is formed between the bottom plate 22 and the support plate 25. The support plate 25 has a second opening 251 that communicates with the liquid storage cavity 203 and communicates with the accommodating space 201.

[0282] The bottom plate 22 refers to the plate that forms the bottom of the box body 20.

[0283] The support plate 25 refers to the plate in the housing 20 used to support the battery cell 300. The battery cell 300 is mounted on the support plate 25 so that the support plate 25 supports the battery cell 300. When the housing 20 includes a frame 23, the support plate 25 is connected to the frame 23, and the frame 23 supports the support plate 25. The support plate 25, the frame 23, and the top cover 21 form an accommodating space 201 for mounting the battery cell 300.

[0284] The bottom plate 22 is positioned below the support plate 25, meaning that the bottom plate 22 is located below the support plate 25 and the support plate 25 is spaced apart from the bottom plate 22. This space serves as the liquid storage chamber 203, which is located at the bottom of the support plate 25.

[0285] The second opening 251 refers to the through-hole structure provided on the support plate 25. The second opening 251 is connected to the liquid storage chamber 203 and the receiving space 201. The battery cell 300 is supported on the support plate 25, and the liquid storage chamber 203 is located at the bottom of the support plate 25. The heat exchange medium flows to the bottom of the battery cell 300 and can flow from the second opening 251 to the liquid storage chamber 203.

[0286] Through the above technical solution, a support plate 25 spaced apart from the bottom plate 22 is provided at the bottom of the housing 20 so that a liquid storage cavity 203 is formed between the bottom plate 22 and the support plate 25. A second opening 251 is provided on the support plate 25 to facilitate the flow of heat exchange medium to the liquid storage cavity 203. This can effectively reduce the risk of heat exchange medium accumulating at the bottom of the battery cell 300 and causing secondary heating of the bottom of the battery cell 300, facilitate the circulation of heat exchange medium, and improve the heat exchange effect.

[0287] In some embodiments, the second opening 251 along the height direction of the housing 20 is offset from the battery cell 300.

[0288] By using the above technical solution, the second opening 251 is staggered from the battery cell 300, so that the battery cell 300 will not block the second opening 251, which facilitates the flow of the heat exchange medium on the side of the battery cell 300 from the second opening 251 to the liquid storage chamber 203, reducing the risk of heat exchange medium accumulating at the bottom of the battery cell 300.

[0289] In some embodiments, please refer to Figure 17 The battery cell 300 can also be directly supported on the base plate 22, with the base plate 22 supporting the battery cell 300.

[0290] In some embodiments, please refer to Figures 12 to 16 and Figure 18 The battery cell 300 has a pressure relief mechanism 3202 on its bottom surface along the height direction, and a pressure relief channel 204 is provided at the bottom of the support plate 25. The pressure relief channel 204 is sealed and isolated from the liquid storage chamber 203. A third opening 252 is provided on the support plate 25 at the position corresponding to the pressure relief mechanism 3202, which connects to the pressure relief channel 204.

[0291] The pressure relief channel 204 refers to the channel structure used to discharge the gas or liquid flowing out of the pressure relief mechanism 3202.

[0292] The sealing and isolation setting between the pressure relief channel 204 and the liquid storage chamber 203 means that the pressure relief channel 204 and the liquid storage chamber 203 are separated, and the gas or liquid in the pressure relief channel 204 will not enter the liquid storage chamber 203, and the heat exchange medium in the liquid storage chamber 203 will not enter the pressure relief channel 204.

[0293] The third opening 252 refers to the through hole structure provided on the support plate 25. The third opening 252 is located at the position corresponding to the pressure relief mechanism 3202, so that the gas or liquid discharged by the pressure relief mechanism 3202 can flow through the third opening 252 into the pressure relief channel 204 and be discharged through the pressure relief channel 204.

[0294] By using the above technical solution, a pressure relief mechanism 3202 is provided at the bottom of the battery cell 300, and a pressure relief channel 204 and a third opening 252 communicating with the pressure relief channel 204 are provided at the bottom of the support plate 25. This can reduce the risk of heat exchange medium entering the pressure relief mechanism 3202 and blocking or corroding the pressure relief mechanism 3202. In the event of thermal runaway of the battery cell 300, the airflow discharged by the pressure relief mechanism 3202 can be discharged from the pressure relief channel 204 at the bottom.

[0295] In some embodiments, please refer to Figure 16 The bottom of the support plate 25 is connected to a guide plate 27, and a pressure relief channel 204 is formed between the guide plate 27 and the support plate 25. The guide plate 27 is provided with a fourth opening 271 corresponding to the position of the second opening 251.

[0296] Guide plate 27 refers to the plate connected to support plate 25. A groove structure can be provided on guide plate 27 so that when guide plate 27 is connected to support plate 25, support plate 25 covers the groove structure to form pressure relief channel 204.

[0297] The fourth opening 271 is a through-hole structure provided on the guide plate 27.

[0298] Through the above technical solution, a guide plate 27 is provided at the bottom of the support plate 25, and a pressure relief channel 204 is formed between the guide plate 27 and the support plate 25. The pressure relief channel 204 is manufactured and set, and can also be well isolated from the liquid storage chamber 203. A fourth opening 271 is provided on the guide plate 27, which also facilitates the flow of the heat exchange medium in the space 201 to the liquid storage chamber 203.

[0299] In some embodiments, please refer to Figure 15 Multiple grooved strips 26 can also be connected to the bottom of the support plate 25 to form a pressure relief channel 204 at the bottom of the support plate 25.

[0300] In some embodiments, a pipe can also be provided at the bottom of the support plate 25, and a through hole is provided on the pipe corresponding to the position of the pressure relief channel 204 to communicate with the third opening 252, and the pressure relief channel 204 is formed inside the pipe.

[0301] In some embodiments, when the bottom of the housing 20 is not provided with a liquid storage chamber 203, a pressure relief channel 204 may be provided at the bottom of the base plate 22, and the pressure relief channel 204 is connected to the pressure relief mechanism 3202 at the bottom of the battery cell 300. For example, the base plate 22 may be made of a profile plate, and a cavity may be made in the base plate 22 made of the profile plate to serve as the pressure relief channel 204.

[0302] In some embodiments, the bottom surface of the battery cell 300 along the height direction is provided with a pressure relief mechanism 3202, the bottom of the housing 20 is provided with a pressure relief channel 204, and the bottom of the housing 20 is provided with an opening corresponding to the position of the pressure relief mechanism 3202 to communicate with the pressure relief channel 204.

[0303] The opening refers to the opening structure set at the bottom of the box body 20.

[0304] As an example, when the bottom of the housing 20 is provided with a support plate 25 and a liquid storage chamber 203, the opening is a third opening 252 provided on the support plate 25. As an example, when the bottom of the housing 20 is not provided with a liquid storage chamber 203, and the pressure relief channel 204 is provided at the bottom of the base plate 22, the opening of the pressure relief channel 204 is an opening structure provided on the base plate 22 of the housing 20. As an example, when the pressure relief channel 204 is provided inside the base plate 22, the opening is an opening structure provided on the side wall of the base plate 22 that connects to the pressure relief channel 204 near the pressure relief mechanism 3202.

[0305] By using the above technical solution, a pressure relief mechanism 3202 is provided at the bottom of the battery cell 300, and a pressure relief channel 204 and an opening communicating with the pressure relief channel 204 are provided at the bottom of the housing 20. This can reduce the risk of heat exchange medium entering the pressure relief mechanism 3202 and blocking or corroding the pressure relief mechanism 3202. In the event of thermal runaway of the battery cell 300, the airflow discharged by the pressure relief mechanism 3202 can be discharged from the pressure relief channel 204 at the bottom.

[0306] In some embodiments, please refer to Figure 8 and Figure 9 When a pressure relief mechanism 3202 is provided at the top of the battery cell 300 in the height direction, an opening 423 can also be provided on the integrated busbar 42 at the position corresponding to the pressure relief mechanism 3202, so as to discharge the gas or liquid discharged by the pressure relief mechanism 3202.

[0307] In some embodiments, please refer to Figures 4 to 8 The first channel 210 includes a liquid supply channel 211, a plurality of spray channels 213 arranged on the top cover 21, and a flow channel 212 connecting the liquid supply channel 211 and each spray channel 213. Each spray channel 213 is provided with a spray hole 214, and the liquid supply channel 211 is provided with a liquid inlet structure 215 for the heat exchange medium to enter.

[0308] The liquid inlet structure 215 refers to the connector or pipe structure connected to the first channel 210. The liquid inlet structure 215 is provided to connect to the liquid supply device to supply the heat exchange medium to the first channel 210.

[0309] The liquid supply channel 211 is a section of the first channel 210 as a whole, and refers to a section of the first channel 210 that is connected to the liquid inlet structure 215 and extends to the drainage channel 212.

[0310] The drainage channel 212 refers to a section of the first channel 210 as a whole. This section is connected to the spray channel 213 and is also connected to the liquid supply channel 211 to drain the heat exchange medium in the liquid supply channel 211 to the spray channel 213.

[0311] The spray channel 213 refers to a section of the first channel 210 that is provided with spray holes 214. The spray channel 213 is connected to the flow channel 212 to guide the heat exchange medium in the flow channel 212 to each spray hole 214, so as to spray the heat exchange medium towards each battery cell 300 through the spray holes 214.

[0312] A liquid supply channel 211 and a liquid inlet structure 215 are provided to supply heat exchange medium to the first channel 210; a spray channel 213 is provided to facilitate spraying heat exchange medium onto the battery cells 300; when there are multiple battery cells 300, the spray channel 213 and the position of the spray holes 214 thereon can be used to spray heat exchange medium onto each battery cell 300 more evenly, so that the overall temperature of the battery device 200 is more balanced; a flow channel 212 is provided to guide the supplied heat exchange medium into the spray channel 213.

[0313] In some embodiments, the liquid supply channel 211 may be extended to the outside of the housing 20 to connect to an external device for supplying the heat exchange medium.

[0314] In some embodiments, an opening structure communicating with the first channel 210 may be provided on the top cover 21 to connect an external liquid supply device, thereby supplying heat exchange medium to the first channel 210. In this case, the liquid inlet structure 215 may not be provided.

[0315] Please see Figure 4 The spray channel 213 is provided with two rows of spray holes 214. (See also...) Figure 5 A row of spray holes 214 can also be provided in the spray channel 213. Multiple spray holes 214 in each row are spaced apart along the extending direction of the spray channel 213. Of course, in some embodiments, more rows of spray holes 214 can be provided in the spray channel 213, depending on the specific requirements.

[0316] In some embodiments, please refer to Figure 2 , Figure 4 and Figure 5 The drainage channel 212 extends along the length direction X of the top cover 21, and multiple spray channels 213 are arranged at intervals along the length direction X of the top cover 21.

[0317] The first length direction X1 is also the length direction X of the top cover 21, and the first width direction Y1 is also the width direction Y of the top cover 21. Generally, the dimension of the top cover 21 in the length direction X is greater than the dimension of the top cover 21 in the width direction Y. Of course, in some cases, the dimension of the top cover 21 in the length direction X can be set to be less than or equal to the dimension of the top cover 21 in the width direction Y.

[0318] The extension of the drainage channel 212 along the length direction X of the top cover 21 means that the extension direction of the drainage channel 212 is parallel to the length direction X of the top cover 21.

[0319] Multiple spray channels 213 are arranged at intervals along the length X of the top cover 21, meaning that multiple spray channels 213 are arranged along the length X of the top cover 21, and adjacent spray channels 213 are spaced apart.

[0320] The flow channel 212 extends along the length direction X of the top cover 21 to facilitate processing and manufacturing. The multiple spray channels 213 are arranged at intervals along the length direction X of the top cover 21. The spray channels 213 extend along the width direction Y of the top cover 21 to facilitate the layout of the spray channels 213. Moreover, the length of the spray channels 213 can be set to be smaller to reduce the flow resistance of the heat exchange medium in the spray channels 213, making it easier for the heat exchange medium to flow to the spray hole 214 for spraying operation.

[0321] In some embodiments, the drainage channel 212 may extend along the width direction Y of the top cover 21, while a plurality of spray channels 213 are spaced apart along the width direction Y of the top cover 21. In other embodiments, the extension direction of the drainage channel 212 may be inclined to the length direction X of the top cover 21. Accordingly, the plurality of spray channels 213 may also be arranged on the top cover 21 in other ways.

[0322] In some embodiments, please refer to Figures 4 to 5 The flow channel 212 is set in a straight line to reduce the resistance to the flow of heat exchange medium in the flow channel 212 and facilitate the flow of heat exchange medium in the flow channel 212.

[0323] In some embodiments, please refer to Figure 4 and Figure 5 Each spray channel 213 extends along the width direction Y of the top cover 21.

[0324] The extension of each spray channel 213 along the width direction Y of the top cover 21 means that the extension direction of the spray channel 213 is parallel to the width direction Y of the top cover 21.

[0325] The above structure allows for a shorter spray channel 213, which reduces the flow resistance of the heat exchange medium in the spray channel 213 and facilitates the flow of the heat exchange medium to the spray hole 214 for spraying operations.

[0326] In some embodiments, drainage channels 212 may be provided at both ends of the top cover 21 at least in the width direction Y, each drainage channel 212 being connected to the liquid supply channel 211, and each spray channel 213 being connected to at least one drainage channel 212.

[0327] The top cover 21 having at least two drainage channels 212 at opposite ends in the width direction Y means that the top cover 21 has at least two drainage channels 212, which are spaced apart along the width direction Y of the top cover 21, and are located at the ends of the top cover 21 in the width direction. By providing drainage channels 212 at both ends of the top cover 21 in the width direction Y, the heat exchange medium can be diverted to both ends of the top cover 21 in the width direction, so as to supply the heat exchange medium from the ends of the top cover 21 in the width direction Y to the spray channel 213.

[0328] Each flow channel 212 is connected to the liquid supply channel 211 so that the supplied heat exchange medium can enter each flow channel 212.

[0329] Each spray channel 213 is connected to at least one drainage channel 212, meaning that each spray channel 213 can be connected to one drainage channel 212 or multiple drainage channels 212. Multiple means two or more.

[0330] Since the edges of the battery device 200 housing 20 are often equipped with partitions and other structural components, the flow channels 212 are set at the opposite ends of the top cover 21 in the width direction Y. This not only makes full use of the space at the top edge of the housing 20, but also increases the cross-sectional area of ​​the flow channels 212 and reduces the resistance of the flow channels 212 in guiding the flow of heat exchange medium, so as to facilitate the flow of heat exchange medium to each spray channel 213.

[0331] In some embodiments, the drainage channel 212 may be a single channel to simplify the structure. When the drainage channel 212 is a single channel, it can be located in the middle of the width direction Y of the top cover 21, thereby allowing the length of each spray channel 213 to be relatively short, facilitating the supply of heat exchange medium to each spray channel 213. Of course, in some embodiments, the drainage channel 212 may also be located at the end of the width direction Y to utilize the space at the edge of the housing 20.

[0332] In some embodiments, two drainage channels 212 may be provided. When two drainage channels 212 are provided, they can be located at both ends of the top cover 21 in the width direction Y. Of course, in some embodiments, three, four, or other drainage channels 212 may also be provided. In some embodiments, when the number of drainage channels 212 is greater than or equal to three, two drainage channels 212 are located at both ends of the top cover 21 in the width direction Y.

[0333] In some embodiments, each spray channel 213 is connected to two drainage channels 212 at both ends.

[0334] The fact that each spray channel 213 is connected to two drainage channels 212 at both ends means that when there are two drainage channels 212, each spray channel 213 is connected to two drainage channels 212 at both ends; when there are three, four or other drainage channels 212, each spray channel 213 is connected to two adjacent drainage channels 212 at both ends.

[0335] By connecting both ends of the spray channel 213 to two flow channels 212, heat exchange medium can be supplied to the same spray channel 213 through the two flow channels 212, thereby reducing the resistance of the heat exchange medium entering the spray channel 213 and facilitating the spraying of the heat exchange medium.

[0336] In some embodiments, please refer to Figure 17 A drain pipe 28 can be installed at the bottom of the housing 20, extending to the outside of the housing 20 to discharge the heat exchange medium at the bottom of the housing 20.

[0337] In some embodiments, a drain pipe 28 is provided at the bottom of the housing 20, and a liquid inlet structure 215 communicating with the first channel 210 is provided on the top cover 21. The liquid inlet structure 215 is extended to the outside of the housing 20, so that it can be connected to an external heat exchange medium cooling circuit to recycle the heat exchange medium.

[0338] In some embodiments, please refer to Figure 18 The battery device 200 also includes a temperature control system 60 for controlling the temperature of the heat exchange medium. The inlet of the temperature control system 60 extends to the bottom of the housing 20 and is used to extract the heat exchange medium. The outlet of the temperature control system 60 is connected to the first channel 210.

[0339] The temperature control system 60 refers to a system that can adjust and control the temperature of the heat exchange medium and supply the heat exchange medium. The temperature control system 60 draws the heat exchange medium from the housing 20. If the temperature of the heat exchange medium is too high, it cools the medium and then supplies it to the first channel 210 so that it can be sprayed onto the battery cells 300 to cool and dissipate heat. Alternatively, the temperature control system 60 draws the heat exchange medium from the housing 20. If the temperature of the heat exchange medium is too low, it heats the medium and then supplies it to the first channel 210 so that it can be sprayed onto the battery cells 300 to heat them. As an example, the temperature control system 60 can heat only the heat exchange medium, thereby heating the battery cells 300. In this case, the battery device 200 is suitable for cold environments. As an example, the temperature control system 60 can cool only the heat exchange medium, thereby cooling the battery cells 300. In this case, the battery device 200 is suitable for normal temperature or high temperature environments. As an example, the temperature control system 60 can both heat and cool the heat exchange medium.

[0340] The inlet of the temperature control system 60 extends to the bottom of the housing 20, facilitating the extraction of the heat exchange medium from the bottom of the housing 20. This allows more heat exchange medium to be extracted into the temperature control system 60, reducing the accumulation of heat exchange medium at the bottom of the housing 20. For example, a pipe can be connected to the inlet of the temperature control system 60, extending to the bottom of the housing 20. Alternatively, the corresponding device for the inlet of the temperature control system 60 can be installed at the bottom of the housing 20. If the housing 20 has a liquid storage chamber 203 at the bottom, the inlet of the temperature control system 60 can extend to the bottom of the liquid storage chamber 203. If the heat exchange medium is directly stored in the receiving space 201, the inlet of the temperature control system 60 can extend to the bottom of the receiving space 201.

[0341] The outlet of the temperature control system 60 is connected to the first channel 210 so that the temperature control system 60 can supply the temperature-adjusted heat exchange medium to the first channel 210. For example, the outlet of the temperature control system 60 can be connected to the first channel 210 through a pipe fitting; or, the corresponding device at the outlet of the temperature control system 60 can be directly connected to the first channel 210.

[0342] Through the above technical solution, a temperature control system 60 is set up to adjust the temperature of the heat exchange medium, and then the heat exchange medium exchanges heat with the battery cell 300 to adjust the temperature of the battery cell 300, so as to facilitate the proper charging and discharging of the battery cell 300.

[0343] In some embodiments, please refer to Figure 18 The temperature control system 60 includes a heat exchanger 62 and a circulating pump 61. The inlet of the circulating pump 61 extends to the bottom of the housing 20, the outlet of the circulating pump 61 is connected to the inlet of the heat exchanger 62, and the outlet of the heat exchanger 62 is connected to the first channel 210.

[0344] The circulating pump 61 refers to a pump used to extract and pump liquids. The circulating pump 61 can be a positive displacement pump, centrifugal pump, etc. The circulating pump 61 can be installed at the bottom of the housing 20, so that the inlet of the circulating pump 61 is at the bottom of the housing 20. Alternatively, the inlet of the circulating pump 61 can be connected to a pipe, with the end of the pipe extending away from the circulating pump 61 to the bottom of the housing 20.

[0345] Heat exchanger 62 refers to a device used to exchange heat with a heat exchange medium to regulate its temperature. Heat exchanger 62 can be an air-cooled heat exchanger, a liquid-cooled heat exchanger, a semiconductor heat exchanger, etc. An air-cooled heat exchanger is a device that uses airflow to exchange heat with the liquid in the heat exchanger 62. A liquid-cooled heat exchanger is a device that uses the liquid flowing through the heat exchanger 62 to exchange heat with the liquid in the heat exchanger 62 that requires temperature regulation, such as a heat exchange medium. A semiconductor heat exchanger is a device that uses semiconductor heating or cooling to exchange heat and regulate the temperature of the liquid in the heat exchanger 62.

[0346] The outlet of heat exchanger 62 is connected to the first channel 210 so that the heat exchange medium, after being conditioned by heat exchanger 62, can enter the first channel 210. For example, the outlet of heat exchanger 62 can be connected to the first channel 210 through a pipe fitting. Alternatively, the outlet of heat exchanger 62 can be directly connected to the first channel 210.

[0347] The outlet of the circulating pump 61 is connected to the inlet of the heat exchanger 62 so that the heat exchange medium is drawn by the circulating pump 61 and pumped to the heat exchanger 62 for temperature regulation. The outlet of the circulating pump 61 can also be connected to the inlet of the heat exchanger 62 via piping, facilitating the placement of the circulating pump 61 and the heat exchanger 62. Alternatively, the outlet of the circulating pump 61 can be directly connected to the inlet of the heat exchanger 62.

[0348] The outlet of the circulating pump 61 is connected to the inlet of the heat exchanger 62, and the outlet of the heat exchanger 62 is connected to the first channel 210. In this way, the heat exchange medium after the heat exchanger 62 has adjusted its temperature can directly enter the first channel 210, which makes it easier to control the temperature of the heat exchange medium and thus control the temperature of the battery cell 300.

[0349] Through the above technical solution, the heat exchange medium at the bottom of the housing 20 is drawn out by the circulating pump 61 to the heat exchanger 62. After the temperature is adjusted by the heat exchanger 62, it enters the first channel 210 and is then sprayed out from the nozzle 214 of the first channel 210 to exchange heat with the battery cell 300, thereby realizing the temperature regulation of the battery cell 300.

[0350] In some embodiments, the inlet of the heat exchanger 62 may be extended to the bottom of the housing 20, and the outlet of the heat exchanger 62 may be connected to the inlet of the circulating pump 61, while the outlet of the circulating pump 61 may be connected to the first channel 210.

[0351] In some embodiments, the heat exchanger 62 is a liquid-liquid heat exchanger 620, which has a second channel 621 for the flow of the heat exchange medium, with both ends of the second channel 621 located outside the housing 20.

[0352] A liquid-liquid heat exchanger 620 is a device used to achieve heat exchange between two fluids at different temperatures. Its working principle is based on the fundamental principles of heat transfer—conduction and convection. The two fluids at different temperatures flow in different channels of the heat exchanger 62. The heat of the high-temperature fluid is transferred to the low-temperature fluid through the wall of the heat exchanger 62, thereby lowering the temperature of the high-temperature fluid and raising the temperature of the low-temperature fluid, achieving the purpose of heat exchange.

[0353] A heat exchange medium is a liquid used to exchange heat with a heat exchange medium. The heat exchange medium can be a liquid such as water or oil, or a gas such as a refrigerant.

[0354] The second channel 621 refers to the channel in the liquid-liquid heat exchanger 620 used for the flow of the heat exchange medium.

[0355] The above technical solution uses a liquid-liquid heat exchanger 620 and sets a second channel 621 in the liquid-liquid heat exchanger 620 for the flow of heat exchange medium, so as to facilitate heat exchange between the heat exchange medium and the heat exchange medium and regulate the temperature of the heat exchange medium; the two ends of the second channel 621 are located outside the housing 20 so as to connect to an external heat exchange medium supply system, thereby exchanging heat with the heat exchange medium.

[0356] In some embodiments, the housing 20 is provided with a receiving cavity 202, and the temperature control system 60 is provided in the receiving cavity 202.

[0357] The receiving cavity 202 refers to the chamber space provided in the housing 20 to accommodate and install the temperature control system 60. If the temperature control system 60 includes a circulating pump 61 and a heat exchanger 62, the circulating pump 61 and the heat exchanger 62 can be installed in the receiving cavity 202 to accommodate the temperature control system 60, improve integration, and protect the temperature control system 60.

[0358] By using the above technical solution, a receiving cavity 202 is set in the enclosure 20 to install the temperature control system 60, and the temperature control system 60 can be protected by the enclosure 20.

[0359] In some embodiments, the accommodating cavity 202 and the accommodating space 201 can be isolated to reduce the influence of the temperature control system 60 on the heat exchange medium in the accommodating space 201, and also to reduce the influence of the heat exchange medium on the temperature control system 60.

[0360] In some embodiments, a portion of the accommodating space 201 may be divided into accommodating cavities 202 to simplify the structure of the housing 20 and facilitate its manufacturing.

[0361] In some embodiments, the temperature control system 60 may also be located outside the housing 20.

[0362] In some embodiments, a temperature control system 60 may be installed in a device using the battery device 200, while the battery device 200 itself may not have a temperature control system 60, in order to simplify the structure of the battery device 200.

[0363] In some embodiments, please refer to Figure 17 The battery device 200 also includes a pressure sensor 29 for detecting pressure in the housing 20, the pressure sensor 29 being installed within the housing space 201.

[0364] Pressure sensor 29 refers to a sensor used to detect pressure.

[0365] The pressure sensor 29 is installed to detect the pressure inside the housing 20. The amount of heat exchange medium in the housing 20 can be determined based on the pressure, so as to control the spraying and discharge of the heat exchange medium and control the pressure in the housing 20, thereby protecting the battery device 200.

[0366] According to some embodiments of this application, a battery device 200 is provided, including a housing 20, a battery cell 300, and a flow guide 51. The housing 20 has a receiving space 201 and a top cover 21, with the top cover 21 located at the top of the receiving space 201. The battery cell 300 is installed in the receiving space 201. A first channel 210 for the flow of heat exchange medium is formed on the top cover 21, and a spray hole 214 is provided on the side of the first channel 210 facing the battery cell 300 to spray the heat exchange medium onto the battery cell 300; the flow guide 51 is disposed on the side of the battery cell 300, and a flow channel 510 is provided in the flow guide 51 to guide the heat exchange medium to the bottom of the housing 20. The flow guide 51 is plate-shaped, and the flow channel 510 is located in the middle of the thickness direction of the flow guide 51. From the top cover 21 to the bottom of the housing 20, the inner diameter of the nozzle 214 gradually decreases, and the line segment formed by the intersection of the inner surface of the nozzle 214 and the cross-section where the center line of the nozzle 214 is located is arc-shaped. The nozzle 214 is positioned directly opposite the corresponding flow channel 510.

[0367] In the technical solution of this application embodiment, a nozzle 214 is provided on the first channel 210 of the top cover 21 to spray heat exchange medium onto the battery cell 300. As the heat exchange medium flows downwards, it contacts the battery cell 300 to quickly regulate the temperature of the battery cell 300, improving its charging and discharging performance, and thus enhancing the charging and discharging performance of the battery device 200. The inner diameter of the nozzle 214 is gradually narrowing, thereby gradually reducing the flow area. This allows the sprayed heat exchange medium to maintain a laminar flow state, ensuring a stable flow rate and reducing flow resistance, thus minimizing splashing. The nozzle 214 is aligned with the corresponding flow channel 510, facilitating the spraying of the heat exchange medium into the flow channel 510 and further reducing splashing. This reduces mist or bubbles generated by splashing, minimizing uneven heat exchange caused by mist or bubbles, and ensuring more uniform heat exchange between the heat exchange medium and the battery cell 300.

[0368] This application provides an electrical device, including a battery device 200 as described in the above embodiments.

[0369] The power supply device can be any of the aforementioned devices or systems using battery device 200.

[0370] 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 by, The battery device comprises: a box body having a containing space, the box body comprising a top cover located at the top of the containing space; a plurality of battery cells installed in the containing space; a first channel for the flow of heat exchange medium is provided on the top cover, the first channel is provided with a spray hole on the side wall of the battery cell, the spray hole is in communication with the containing space; the inner diameter of the spray hole is tapered from the top cover to the bottom of the box body.

2. The battery device of claim 1, wherein The inner surface of the spray hole and the center line of the spray hole form an arc-shaped line.

3. The battery device according to claim 1 or 2, wherein The inner surface of the spray hole is provided with a lotus leaf effect coating.

4. The battery device according to any one of claims 1 to 3, wherein The roughness of the inner surface of the spray hole is less than or equal to 0.2mm.

5. The battery device of any one of claims 1-4, wherein, The spray hole is a circular hole, the diameter of the spray hole inlet ranges from 2mm to 10mm, the diameter of the spray hole outlet ranges from 0.5mm to 2mm, and the length of the spray hole ranges from 2mm to 5mm.

6. The battery device of claim 5, wherein The diameter of the spray hole inlet ranges from 3mm to 4mm, and the diameter of the spray hole outlet ranges from 0.8mm to 1.5mm.

7. The battery device of any one of claims 1-6, wherein, The battery device comprises a plurality of battery cells arranged in a first direction, and a flow guide space is provided between two adjacent battery cells in the first direction, and the spray hole is arranged opposite to the corresponding flow guide space.

8. The battery device of claim 7, wherein The flow guide space is provided with a flow guide member, the flow guide member is provided with a flow channel for guiding the flow of the heat exchange medium to the bottom of the box body, and the spray hole is arranged opposite to the corresponding flow channel.

9. The battery device of claim 8, wherein, The flow guide member is plate-shaped, and the flow channel is located in the middle of the thickness direction of the flow guide member.

10. The battery device according to claim 8 or 9, wherein The flow guide member comprises two wall plates spaced apart in the thickness direction thereof, the flow channel is formed between the two wall plates, at least one of the wall plates is elastically bendable; and / or, at least one of the wall plates is movably arranged in the thickness direction.

11. The battery device of claim 10, wherein, The flow guide member is provided with a limiting structure for limiting the minimum distance between the two wall plates.

12. The battery device of claim 11, wherein, The limiting structure comprises a limiting protrusion provided on at least one of the wall plates; and / or, the limiting structure comprises a rib connecting the two wall plates.

13. The battery device according to claim 11 or 12, wherein The limiting structure is an elastic member.

14. The battery device of any one of claims 8-13, wherein, An insulating layer is provided on the outer surface of the flow guide member; and / or, an insulating partition plate is provided between the flow guide member and the adjacent battery cell.

15. The battery device of any one of claims 8-14, wherein, The inner surface of the flow channel is provided with a flow disturbance structure.

16. The battery device of claim 15, wherein, The flow disturbance structure comprises one or more of a convex point, a concave groove and a convex rib provided on the inner surface of the flow channel.

17. The battery device of any one of claims 8-16, wherein, The battery cell is provided with the flow guide member at least on the side of the largest area side.

18. The battery device of any one of claims 1-17, wherein, The battery device comprises an integrated busbar, the integrated busbar is arranged between the battery cell and the top cover, and the integrated busbar is provided with a first opening for the flow of the heat exchange medium.

19. The battery device of claim 18, wherein, The integrated busbar is provided with the first opening at least at the position corresponding to the spray hole.

20. The battery device of claim 18 or 19, wherein, The top surface of the integrated busbar is provided with a groove at the position corresponding to the side edge of the battery cell, and the first opening is provided on the groove wall of the groove.

21. The battery device of claim 20, wherein, A plurality of first openings are arranged on the groove wall of the groove in the extension direction of the groove.

22. The battery device of any one of claims 1-21, wherein, The box comprises a bottom plate and a support plate, the battery cell is installed on the support plate, the bottom plate is arranged below the support plate to form a liquid storage cavity between the bottom plate and the support plate, the support plate is provided with a second opening hole communicating with the liquid storage cavity.

23. The battery device of claim 22, wherein, The second opening hole is staggered with the battery cell along the height direction of the box.

24. The battery device of claim 22 or 23, wherein, The bottom surface of the battery cell along the height direction is provided with a pressure relief mechanism, the bottom of the support plate is provided with a pressure relief channel, the pressure relief channel is arranged in sealed isolation with the liquid storage cavity, and the support plate is provided with a third opening hole corresponding to the position of the pressure relief mechanism and communicating with the pressure relief channel.

25. The battery device of claim 24, wherein, The bottom of the support plate is connected with a guide plate, the pressure relief channel is formed between the guide plate and the support plate, and the guide plate is provided with a fourth opening hole corresponding to the position of the second opening hole.

26. The battery device of any one of claims 1-21, wherein, The bottom surface of the battery cell along the height direction is provided with a pressure relief mechanism, the bottom of the box is provided with a pressure relief channel, and the bottom of the box is provided with a port corresponding to the position of the pressure relief mechanism and communicating with the pressure relief channel.

27. The battery device of any one of claims 1-26, wherein, The first channel comprises a liquid supply channel, a plurality of spray channels arranged on the top cover, and a drainage channel connecting the liquid supply channel and each spray channel, each spray channel is provided with the spray hole, and the liquid supply channel is provided with a liquid inlet structure for the heat exchange medium.

28. The battery device of any one of claims 1-27, wherein, The battery device further comprises a temperature control system for temperature control of the heat exchange medium, an inlet of the temperature control system extends to the bottom of the box and is used for extracting the heat exchange medium, and an outlet of the temperature control system is in communication with the first channel.

29. The battery device of claim 28, wherein, The temperature control system comprises a heat exchanger and a circulating pump, an inlet of the circulating pump extends to the bottom of the box, an outlet of the circulating pump is connected with an inlet of the heat exchanger, and an outlet of the heat exchanger is in communication with the first channel.

30. The battery device of claim 29, wherein, The heat exchanger is a liquid-liquid heat exchanger, the liquid-liquid heat exchanger is provided with a second channel for flow of heat exchange medium, and two ends of the second channel are arranged outside the box.

31. The battery device of any one of claims 28-30, wherein, The box is provided with a containing cavity, and the temperature control system is arranged in the containing cavity.

32. An electrical device, comprising: The battery device comprises the battery device according to any one of claims 1-31.

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