Battery device, refrigerant heat exchange device, and electric device

Abstract

The application belongs to the technical field of battery production and provides a battery device, a refrigerant heat exchange device and a power utilization device. The battery device comprises a box assembly, a battery monomer assembly and a refrigerant heat exchange component. The box assembly has a containing cavity. The battery monomer assembly is accommodated in the containing cavity. The refrigerant heat exchange component is configured to exchange heat with the battery monomer assembly. The refrigerant heat exchange component comprises a functional area and a non-functional area. The functional area and the non-functional area are arranged along a first direction and form a boundary area extending along a second direction at a boundary position. The non-functional area comprises a plurality of first main flow channels. The functional area comprises a plurality of branch flow channels. Each first main flow channel is arranged in communication with at least one branch flow channel. The position where each first main flow channel is connected with the branch flow channel forms a first node part. Each first node part is distributed in the boundary area. The second direction is perpendicular to the first direction. The application aims to improve the temperature uniformity of the refrigerant heat exchange component.

Description

[0001] This application claims priority to Chinese Patent Application No. 202420907842.4, filed with the State Intellectual Property Office of China on April 28, 2024, entitled "Heat Exchange Device, Battery, and Electrical Device", the entire contents of which are incorporated herein by reference; and claims priority to International Application PCT / CN2025 / 078572, filed on February 21, 2025, entitled "Battery Device, Refrigerant Heat Exchange Device, and Electrical Device", the entire contents of which are incorporated herein by reference; and claims priority to International Application PCT / CN2025 / 078593, filed on February 21, 2025, entitled "Refrigerant Heat Exchange Component, Battery Device, and Electrical Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery manufacturing technology, and in particular to a battery device, a refrigerant heat exchange device, and an electrical device. Background Technology

[0003] During the charging and discharging process, the battery devices in new energy vehicles release a lot of heat. The battery devices are usually equipped with heat exchange components that can exchange heat between individual battery cells to cool down the individual battery cells.

[0004] In related technologies, the heat exchange components have poor temperature uniformity and uneven temperature distribution, which leads to uneven heat exchange between the heat exchange components and the battery cells, thus affecting the performance and service life of the battery device. Utility Model Content

[0005] The purpose of this application is to provide a battery device, a refrigerant heat exchange device, and an electrical device, which aims to solve the technical problem of poor temperature uniformity of the refrigerant heat exchange components in the battery device.

[0006] In a first aspect, this application provides a battery device, comprising:

[0007] The housing assembly has a receiving cavity;

[0008] The battery cell assembly is housed within the receiving cavity;

[0009] A refrigerant heat exchange component is configured to exchange heat with a battery cell assembly. The refrigerant heat exchange component includes a functional area and a non-functional area. The functional area and the non-functional area are arranged along a first direction and form a boundary area extending along a second direction at their intersection. The non-functional area includes multiple first main flow channels, and the functional area includes multiple branch flow channels. Each first main flow channel is connected to at least one branch flow channel, and the connection between each first main flow channel and the branch flow channel forms a first node. Each first node is distributed in the boundary area. The second direction is perpendicular to the first direction.

[0010] In this embodiment, the first main flow channel and the branch flow channels are respectively arranged in the non-functional area and the functional area. This allows the first nodes between the first main flow channel and each branch flow channel to be evenly distributed in the boundary area between the functional area and the non-functional area. Within the functional area, there are no connecting nodes where the flow channels intersect. This reduces the resistance and pressure loss of the refrigerant in the branch flow channels of the functional area, making the refrigerant flow more smoothly. This improves the uniformity of temperature distribution on the refrigerant heat exchange component and increases the heat exchange efficiency, thereby achieving the purpose of balancing and rapidly exchanging heat on the battery cell assembly.

[0011] In one embodiment, each branch channel extends along a first direction and is spaced apart in a second direction.

[0012] In this embodiment, since each branch flow channel is arranged to extend along the first direction, no first node will be generated within the functional area. The refrigerant can flow more smoothly in the functional area to improve the uniformity of temperature distribution on the refrigerant heat exchange component and improve the heat exchange efficiency, so as to achieve the purpose of balancing and rapidly exchanging heat on the battery cell assembly.

[0013] In one embodiment, the cross-sectional area of ​​each first main channel is the same as the cross-sectional area of ​​each branch channel.

[0014] In this embodiment, the cross-sectional area of ​​the first main flow channel is equal to that of the branch flow channel, which helps to improve the flow resistance change during the refrigerant flow process and reduces the flow resistance. The flow resistance is less likely to fluctuate drastically, which helps to reduce pressure loss (i.e., pressure drop). This, in turn, reduces the temperature difference between the inlet and outlet of the flow channel, resulting in a more uniform temperature distribution on the refrigerant heat exchange component and improved temperature uniformity performance. This, in turn, enhances the effect of the refrigerant heat exchange component on the balanced heat exchange of the battery cell assembly.

[0015] In one embodiment, the functional area includes multiple main heat exchange channels, which are arranged in parallel in a second direction, and each main heat exchange channel includes multiple interconnected branch channels.

[0016] In this embodiment, multiple branch flow channels are arranged in parallel with multiple main heat exchange flow channels, thereby forming multiple independent circulation loops. This facilitates the control of multiple circulation loops to perform targeted heat exchange on individual battery cells, which helps to improve the uniformity of heat exchange.

[0017] In one embodiment, the refrigerant heat exchange component has a first surface opposite to the battery cell assembly; the battery cell assembly includes multiple rows of battery cell groups, each row of battery cell groups including multiple battery cells stacked in a first direction, the multiple rows of battery cell groups being arranged side by side in a second direction, and the projected area of ​​each row of battery cell groups on the first surface covering at least one main heat exchange channel.

[0018] In this embodiment, the battery cell assembly is arranged into multiple rows of battery cell groups. Corresponding to each row of battery cell groups, the refrigerant heat exchange component forms multiple main heat exchange channels. The multiple main heat exchange channels are connected in parallel in the arrangement direction of the battery cell groups, and the extension direction of each main heat exchange channel is consistent with the arrangement direction of the multiple battery cells in each row of battery cell groups. This allows the multiple battery cells in each row of battery cell groups to have a larger heat exchange area with the main heat exchange channels, and each main heat exchange channel can more effectively exchange heat with each battery cell group, which is beneficial to improving the effect of balanced heat exchange.

[0019] In one embodiment, the refrigerant heat exchange component has a first surface opposite to the battery cell assembly, and the area of ​​the projected region of the battery cell assembly on the first surface is greater than or equal to 1m². 2 In this case, the number of first nodes is 2-20.

[0020] In this embodiment, the area of ​​the projected region of the battery cell assembly on the first surface is used as the trigger condition, and the trigger condition is when the projected area is greater than or equal to 1m². 2 In this case, arranging 2-20 first nodes is more conducive to giving the refrigerant heat exchange components better temperature uniformity and heat exchange capacity.

[0021] In one embodiment, the refrigerant heat exchange component has a first surface opposite to the battery cell assembly, and the area of ​​the projected region of the battery cell assembly on the first surface is less than 1m². 2 In this case, the number of first nodes is 2-15.

[0022] In this embodiment, the area of ​​the projected region of the battery cell assembly on the first surface is used as the trigger condition, and the projected area is less than 1m². 2 In this case, the layout of 2-15 first nodes can reduce the risk of increasing the weight of the ineffective structure due to node redundancy, and can reduce the risk of performance degradation caused by local temperature difference through reasonable node layout, so as to improve the temperature uniformity and heat exchange capacity of the refrigerant heat exchange components.

[0023] In one embodiment, the refrigerant heat exchange component has a first surface opposite to the battery cell assembly, and the number of first nodes is at least two. For every 0.5 square meters increase in the area of ​​the projected region of the battery cell assembly on the first surface, the number of first nodes should increase by 1-4.

[0024] In this embodiment, when the required heat exchange area for a single battery cell module increases, for every 0.5m increase... 2 To increase the heat exchange area, the number of main heat exchange channels should be increased. This will help reduce the problem of uneven temperature distribution caused by extending the flow path of a main heat exchange channel, thereby improving the heat exchange balance and heat exchange capacity.

[0025] In one embodiment, the first node is divided into a first branch node and a first confluence node; each main heat exchange channel includes an upstream channel and a downstream channel that are connected to each other, and each upstream channel and each downstream channel includes at least one branch channel; the first trunk channel includes a plurality of first sub-trunk channels and a plurality of second sub-trunk channels, each first sub-trunk channel is connected to each branch channel in the upstream channel of each main heat exchange channel and forms a first branch node at the connection position, and each second sub-trunk channel is connected to each branch channel in the downstream channel of each main heat exchange channel and forms a first confluence node at the connection position.

[0026] In this embodiment, by rationally arranging the first main flow channel and each main heat exchange flow channel, each first node is arranged at one end of each main heat exchange flow channel, so that no branching or merging nodes are formed in the part of the functional area mainly used for heat exchange, thereby improving the smooth flow of refrigerant.

[0027] In one embodiment, some or all of the upstream channels in the main heat exchange channels are arranged adjacent to the upstream channels in the adjacent main heat exchange channels, and some or all of the downstream channels in the main heat exchange channels are arranged adjacent to the downstream channels in the adjacent main heat exchange channels.

[0028] In this embodiment, the upstream flow channels or downstream flow channels of the two adjacent main heat exchange channels are arranged adjacently, which makes it easier to arrange the first trunk flow channel section of the non-functional area more regularly.

[0029] In one embodiment, the non-functional area further includes a first flow channel and a second flow channel, the first flow channel being connected to a first sub-main road flow channel and the second flow channel being connected to a second sub-main road flow channel; along the second direction, both the first flow channel and the second flow channel are distributed in the central region of the non-functional area.

[0030] In this embodiment, the first flow channel and the second flow channel are arranged in the middle area of ​​the non-functional area along the second direction, which is beneficial to achieve uniform and symmetrical distribution of the refrigerant after it enters the refrigerant flow channel component.

[0031] In one embodiment, at least two first trunk flow channels intersect and merge.

[0032] In this embodiment, by merging multiple first trunk flow channels, it is beneficial to save space in non-functional areas and improve space utilization.

[0033] In one embodiment, the functional area includes a first flow channel area and a second flow channel area arranged along a first direction, with each branch flow channel distributed in the first flow channel area and the second flow channel area; a boundary area is formed between the first flow channel area and the non-functional area; the non-functional area also includes a second main flow channel; the functional area also includes at least one guide flow channel, one end of which is connected to a portion of the branch flow channel and forms a second node at the connection position, and the other end of which is connected to the second main flow channel and forms a third node at the connection position; the second node portion is distributed in the second flow channel area, and the third node portion is distributed in the boundary area.

[0034] In this embodiment, by adding a guide channel, a small number of second nodes can be arranged in the second channel area, and the number of first nodes in the boundary area is relatively reduced, so as to reduce the arrangement density of first nodes in the boundary area and reduce the flow pressure. In addition, the first channel area is mainly used for heat exchange with the battery cells. Cross nodes for diversion and convergence are set in this area, which helps to improve the overall heat exchange capacity and temperature uniformity of the refrigerant heat exchange component.

[0035] In one embodiment, the cross-sectional areas of the first main flow channel, the second main flow channel, the branch flow channel, and the guide flow channel are all the same.

[0036] In this embodiment, the cross-sectional areas of the first main flow channel, the second main flow channel, the branch flow channel, and the guide flow channel are all the same. This helps to improve the flow resistance changes during the refrigerant flow process and reduces the flow resistance. The flow resistance is less likely to fluctuate drastically, which helps to reduce pressure loss (i.e., pressure drop). This, in turn, reduces the temperature difference between the inlet and outlet of the flow channel, resulting in a more uniform temperature distribution on the refrigerant heat exchange component and improved temperature uniformity. This, in turn, enhances the effect of the refrigerant heat exchange component on the balanced heat exchange of the battery cell assembly.

[0037] In one embodiment, the refrigerant heat exchange component has a first surface and a second surface opposite to each other, the first surface being disposed opposite to the battery cell assembly; the refrigerant heat exchange component includes a plurality of mounting holes, which are disposed through the first surface and the second surface and are disposed to avoid the first main flow channel and the branch flow channel.

[0038] In this embodiment, by providing mounting holes, it is easy to connect and fix the refrigerant heat exchange component to other components using bolts or other locking devices, thereby improving the convenience of connecting the refrigerant heat exchange component to other components.

[0039] In one embodiment, a plurality of mounting holes are arranged in the central region of the refrigerant heat exchange component along a first direction and spaced apart along a second direction; and / or, a plurality of mounting holes are arranged in the central region of the refrigerant heat exchange component along the second direction and spaced apart along the first direction.

[0040] In this embodiment, multiple mounting holes are arranged in the middle of the refrigerant heat exchange component and are evenly distributed at intervals, which helps to improve the balance of the force on the refrigerant heat exchange component and makes the layout between the main heat exchange channel and the mounting holes more regular.

[0041] In one embodiment, the refrigerant heat exchange component also has multiple cavities inside, each cavity being configured to avoid the first main flow channel and the branch flow channel.

[0042] In this embodiment, by setting multiple cavities, the flow can be guided and the air can be vented during the welding process, which is beneficial to improving the welding quality and welding sealing, and also to improving the overall structural strength of the refrigerant heat exchange component.

[0043] Secondly, this application provides a refrigerant heat exchange device, which includes a refrigerant heat exchange component in a battery device as described in any of the above claims.

[0044] Thirdly, this application provides an electrical device, including a battery device as described in any of the above, the battery device being used to store or provide electrical energy.

[0045] 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

[0046] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0048] Figure 2Schematic diagram of the exploded structure of the battery device provided in some embodiments of this application Figure 1 ;

[0049] Figure 3 Schematic diagram of the exploded structure of the battery device provided in some embodiments of this application Figure 2 ;

[0050] Figure 4 An exploded view of the refrigerant heat exchange component in a battery device provided in some embodiments of this application;

[0051] Figure 5 Schematic diagram of the internal flow channel arrangement of the refrigerant heat exchange component in some embodiments of this application Figure 1 ;

[0052] Figure 6 Schematic diagram of the flow channel arrangement within the functional area of ​​the refrigerant heat exchange component in some embodiments of this application Figure 1 ;

[0053] Figure 7 The relative positional relationship between the refrigerant heat exchange channel and the battery cell assembly in some embodiments of this application Figure 1 ;

[0054] Figure 8 The relative positional relationship between the refrigerant heat exchange channel and the battery cell assembly in some embodiments of this application Figure 2 ;

[0055] Figure 9 Schematic diagram of the internal flow channel arrangement of the refrigerant heat exchange component in some embodiments of this application Figure 2 ;

[0056] Figure 10 Schematic diagram of the flow channel arrangement within the functional area of ​​the refrigerant heat exchange component in some embodiments of this application Figure 2 ;

[0057] Figure 11 A schematic diagram of the structure of a main heat exchange channel within the refrigerant heat exchange component of a battery device provided in some embodiments of this application. Figure 1 ;

[0058] Figure 12 A schematic diagram of the structure of a main heat exchange channel within the refrigerant heat exchange component of a battery device provided in some embodiments of this application. Figure 2 ;

[0059] Figure 13 Schematic diagram of the distribution of mounting holes on the refrigerant heat exchange component in some embodiments of this application Figure 1 ;

[0060] Figure 14 Schematic diagram of the distribution of mounting holes on the refrigerant heat exchange component in some embodiments of this application Figure 2 ;

[0061] Figure 15 Schematic diagram of the distribution of mounting holes on the refrigerant heat exchange component in some embodiments of this application Figure 3 .

[0062] Explanation of reference numerals in the attached figures:

[0063] 1000, Vehicle; 1100, Battery Unit; 1110, Battery Cell Assembly; 1111, Battery Cell Group; 1112, Battery Cell; 1120, Housing Assembly; 1121, Housing Body; 1122, Cover; 1123, Housing Frame; 1124, Receiving Cavity; 1125, Housing Bottom Plate; 1130, Refrigerant Heat Exchange Component; 1131, Non-functional Area; 11311, First Flow Channel; 11312, Second Flow Channel; 11313, First Main Flow Channel; 11314, Second Main Flow Channel; 11315, First Sub-Main Flow Channel; 11316, Second Sub-Main Flow Channel; 1132, Functional Area; 11321, Branch Flow Channel; 11322, First Flow channel area; 11323, second flow channel area; 1133, boundary area; 11331, first node section; 11332, second node section; 11333, third node section; 11334, first confluence node section; 11335, first branch node section; 11336, main heat exchange flow channel; 11337, upstream flow channel; 11338, downstream flow channel; 11339, guide flow channel; 1134, heat exchange surface; 1135, first surface; 1136, first sub-component; 1137, second sub-component; 1138, cavity; 1139, mounting hole; 1140, connector component; 1200, controller; 1300, motor; X, first direction; Y, second direction. Detailed Implementation

[0064] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application, and are therefore merely examples and should not be used to limit the scope of protection of this application.

[0065] 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.

[0066] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0067] 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.

[0068] 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.

[0069] 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).

[0070] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0071] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0072] In recent years, new energy vehicles have experienced rapid development, and their market share is increasing. The urgent problem to be solved in the new energy vehicle industry is to quickly and efficiently achieve energy replenishment.

[0073] During the charging and discharging process, the battery devices in new energy vehicles release a lot of heat. The battery devices are usually equipped with refrigerant heat exchange components that can exchange heat between individual battery cells to cool down the individual battery cells.

[0074] Fast charging is a mainstream solution for rapidly replenishing energy in new energy vehicles. However, its implementation faces numerous challenges. During fast charging, the electrode components generate a significant amount of heat, which can easily cause a rapid rise in the internal temperature of the battery pack. In fast charging, uneven heat exchange between the refrigerant heat exchange components and individual battery cells is more likely to occur, leading to a sharp increase in the temperature of some individual battery cells. This results in a large accumulation of heat inside the battery pack, affecting its performance and lifespan, and potentially causing significant safety hazards during use. Therefore, ensuring balanced heat dissipation and improving the consistency of temperature distribution within the battery pack has become a bottleneck in battery thermal management.

[0075] Specifically, battery devices generate heat during charging and discharging. If this heat cannot be effectively dissipated, it may lead to a decline in battery performance and a shortened lifespan. High temperatures can accelerate internal chemical reactions within the battery device, increase internal resistance, reduce energy density, and in severe cases, may cause thermal runaway. Therefore, refrigerant heat exchange components are installed in battery devices to cool the individual battery cells.

[0076] Regarding the issue of uneven temperature distribution and localized high temperatures within battery devices, research has revealed that refrigerant heat exchange components employing refrigerant heat exchange contain numerous main and branch flow channels. These main and branch channels form connecting nodes, which can be understood as the intersections of multiple flow channels. These nodes represent locations where the shape and structure of the flow channels change. Fluid at these nodes is prone to localized eddies and turbulence, leading to increased flow resistance. Increased flow resistance requires greater power to propel the refrigerant through the channels, increasing system energy consumption. In related technologies, if numerous nodes are located in the central region of the refrigerant heat exchange component where heat exchange with individual battery cells occurs, it further exacerbates the problem of multi-point flow resistance and significant overall resistance. This increased flow resistance also contributes to uneven refrigerant flow, negatively impacting heat exchange efficiency.

[0077] In addition, a large number of disorganized nodes distributed in the heat exchange area of ​​the refrigerant heat exchange component can easily lead to increased pressure loss. Numerous nodes will complicate the pressure distribution within the flow channel, exacerbate local pressure changes, and thus increase the overall pressure loss of the flow channel. Excessive pressure loss will affect the refrigerant circulation efficiency and reduce system performance. When the pressure loss exceeds a certain limit, it may cause the refrigerant to fail to circulate normally, affecting the heat dissipation effect of the battery.

[0078] Furthermore, the numerous and disorganized nodes complicate the flow channel structure, increasing the difficulty and cost of manufacturing. Higher precision and more complex processes are required during manufacturing to ensure the quality and performance of the flow channel. In addition, the complex structure also makes maintenance and repair more difficult, increasing maintenance costs and time.

[0079] Furthermore, while the original design intent of the nodes was to facilitate fluid distribution and convergence, an excessive number of nodes scattered haphazardly within the heat exchange area of ​​the refrigerant components can easily lead to uneven fluid distribution. During refrigerant branching, the complex flow characteristics at the nodes may result in some branches receiving excessive refrigerant flow while others receive insufficient flow, affecting the uniform cooling of individual battery cells. Similarly, during convergence, uneven refrigerant flow may occur between different branches, leading to a decline in system performance.

[0080] Therefore, this application provides a battery device in which the first main flow channel and the branch flow channels are respectively arranged in the non-functional area and the functional area. This allows the first nodes between the first main flow channel and each branch flow channel to be evenly distributed in the boundary area between the functional area and the non-functional area. Within the functional area, no connection nodes are formed where the flow channels intersect. This reduces the resistance and pressure loss of the refrigerant in the branch flow channels of the functional area, making the refrigerant flow more smoothly. This improves the uniformity of temperature distribution on the refrigerant heat exchange component and increases the heat exchange efficiency, thereby achieving the purpose of balancing and rapidly exchanging heat in the battery cell assembly.

[0081] Specifically, refer to Figure 2 and Figure 3As shown, this application embodiment provides a battery device 1100, which may include one or more battery cell assemblies 1110 for providing voltage and capacity. Each battery cell assembly 1110 may include multiple battery cells 1112, which are connected in series, parallel, or mixed connections via a busbar. The battery device 1100 may also be a battery pack, which generally includes a housing assembly 1120 and one or more battery cell assemblies 1110, with the battery cell assemblies 1110 housed within the housing assembly 1120.

[0082] The battery device 1100 disclosed in this application can be used in electrical devices that use the battery device 1100 as a power source or in various energy storage devices and systems that use the battery device 1100 as an energy storage element. Electrical devices can be, but are not limited to, mobile phones, portable devices, laptops, electric toys, power tools, electric vehicles, vehicles 1000, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0083] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0084] Please refer to Figure 1 The figure shows a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 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 1100 is provided inside the vehicle 1000, and the battery device 1100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 1100 can be used to power the vehicle 1000; for example, the battery device 1100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 1200 and a motor 1300. The controller 1200 is used to control the battery device 1100 to supply power to the motor 1300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0085] In some embodiments of this application, the battery device 1100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0086] Please refer to Figure 2 and Figure 3 As shown, Figure 2 and Figure 3 This is an exploded view of a battery device 1100 provided in some embodiments of this application. In one embodiment, the battery device 1100 includes a housing assembly 1120 and a battery cell assembly 1110. A receiving cavity 1124 is formed within the housing assembly 1120, and the battery cell assembly 1111 is housed within the receiving cavity 1124. The battery cell assembly 1110 is typically formed by arranging multiple battery cells 1112. Alternatively, the battery cell assembly 1110 can also be a battery module, which is formed by arranging and fixing multiple battery cells 1112 into an independent module. The housing assembly 1120 provides the receiving cavity 1124 for the battery cell assembly 1110, and the housing assembly 1120 can adopt various structures.

[0087] A battery cell 1112 refers to the smallest unit that makes up the battery device 1100. Each battery cell 1112 can be a secondary battery cell or a primary battery cell; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited to these. The battery cell 1112 can be cylindrical, flat, cuboid, or other shapes.

[0088] According to some embodiments of this application, refer to Figure 2-8 As shown in the figure, this application provides a battery device 1100, which includes a housing assembly 1120, a battery cell assembly 1110, and a refrigerant heat exchange component 1130. The housing assembly 1120 has a receiving cavity 1124; the battery cell assembly 1110 is housed in the receiving cavity 1124; the refrigerant heat exchange component 1130 is configured to exchange heat with the battery cell assembly 1110; the refrigerant heat exchange component 1130 includes a functional area 1132 and a non-functional area 1131, which are arranged along a first direction X. The two sides are arranged to form a boundary area 1133 extending along the second direction Y at the intersection. The non-functional area 1131 includes a plurality of first trunk channels 11313, and the functional area 1132 includes a plurality of branch channels 11321. Each first trunk channel 11313 is connected to at least one branch channel 11321, and a first node 11331 is formed at the position where each first trunk channel 11313 connects to the branch channel 11321. Each first node 11331 is distributed in the boundary area 1133. The second direction Y is perpendicular to the first direction X.

[0089] Specifically, the battery cell assembly 1110 includes one or more battery cells 1112. The refrigerant heat exchange component 1130 needs to exchange heat with the battery cell assembly 1110. Therefore, the refrigerant heat exchange component 1130 needs to be located close to the battery cell assembly 1110, or the refrigerant heat exchange component 1130 needs to directly contact or abut against the battery cell assembly 1110 to improve the heat exchange effect. When the refrigerant heat exchange component 1130 exchanges heat with the battery cell assembly 1110, a large heat exchange area needs to be formed between the refrigerant heat exchange component 1130 and the battery cell 1112 to improve the heat exchange effect. Therefore, a heat exchange surface 1134 that is close to or in contact with the surface of the battery cell 1112 is formed on the refrigerant heat exchange component 1130. The refrigerant heat exchange component 1130 also has a first surface 1135, and the battery cell assembly 1110 is also disposed opposite to the first surface 1135. The heat exchange surface 1134 is a part of the first surface 1135.

[0090] Taking the horizontal placement of the battery device 1100 as an example, the surface of the battery cell 1112 that is close to or in contact with the heat exchange surface 1134 can be the bottom surface of the battery cell 1112. That is to say, the refrigerant heat exchange component 1130 can be located at the bottom of the battery cell assembly 1110. The refrigerant heat exchange component 1130 located at the bottom of the battery cell assembly 1110 can also be called a heat exchange base plate or a cooling base plate.

[0091] For ease of explanation, the following embodiments will be described using an example of a battery device 1100 of this application that is placed horizontally, with the refrigerant heat exchange component 1130 located at the bottom of the battery cell assembly 1110.

[0092] For refrigerant heat exchange component 1130, refer to Figure 5 and Figure 6As shown, the refrigerant heat exchange component 1130 includes a functional area 1132 and a non-functional area 1131. A branch flow channel 11321 is arranged in the functional area 1132, and a first main flow channel 11313 is arranged in the non-functional area 1131. Both the branch flow channel 11321 and the first main flow channel 11313 are refrigerant heat exchange channels for circulating refrigerant. The aforementioned first main flow channel 11313 and branch flow channel 11321 can be understood as the hole structure inside the refrigerant heat exchange component 1130. For example, the refrigerant heat exchange component 1130 is plate-shaped, and through-hole structures or cavity structures with a certain extension length and extension path are opened in the plate of the refrigerant heat exchange component 1130. The through-hole structure or cavity structure forms the refrigerant heat exchange channel. The refrigerant heat exchange component 1130 can be integrally molded. The first main flow channel 11313 and the branch flow channel 11321 can be prepared by gas-assisted or water-assisted molding. Alternatively, the refrigerant heat exchange component 1130 can also be assembled. For example, the refrigerant heat exchange component 1130 includes a first sub-component 1136 and a second sub-component 1137. A groove structure with a preset extension length and extension shape is formed on the second sub-component 1137. The groove structure can be prepared by stamping. The first sub-component 1136 and the second sub-component 1137 are fixedly or detachably connected, and the groove opening is closed to form a through-hole structure or a cavity structure, which forms the first main flow channel 11313 and the branch flow channel 11321. The first main flow channel 11313 and the branch flow channel 11321 should be located close to the heat exchange surface 1134. The extension paths of the first main flow channel 11313 and the branch flow channel 11321 can be parallel to the heat exchange surface 1134 and the first surface 1135 to increase the heat exchange effect.

[0093] For example, the first sub-component 1136 can be an upper plate, and the second sub-component 1137 can be a lower plate. The first main flow channel 11313 and the branch flow channel 11321 are formed on the lower plate by stamping. The first sub-component 1136 and the second sub-component 1137 can be welded together by brazing, and the welded area can play a role in heat transfer.

[0094] Generally, the functional area 1132 in the refrigerant heat exchange component 1130 is mainly used for heat exchange with the battery cell assembly 1110, while the non-functional area 1131 can be used for diverting, converging, and guiding the heat exchange refrigerant. The functional area 1132 and the non-functional area 1131 are arranged in sections on the refrigerant heat exchange component 1130. For example, the functional area 1132 and the non-functional area 1131 are arranged along the first direction X, as shown in the figure. Figure 5 As shown, functional area 1132 is located to the right of non-functional area 1131.

[0095] A boundary connecting area will be formed between functional area 1132 and non-functional area 1131. This boundary area is defined as boundary area 1133. Since functional area 1132 and non-functional area 1131 are arranged in the first direction X, it can be known that boundary area 1133 should form an area extending along the second direction Y on the first surface 1135. Alternatively, it can be understood that boundary area 1133 extends in the second direction Y, where the second direction Y can be understood as the length direction of boundary area 1133. Therefore, in the first direction X, boundary area 1133 should also have a certain width.

[0096] In the non-functional area 1131, multiple first main flow channels 11313 are arranged. The first main flow channel 11313 can be understood as a flow channel used for diversion, convergence, etc. In the functional area 1132, multiple branch flow channels 11321 are arranged. The branch flow channels 11321 are the main flow channels used for heat exchange of the battery cell assembly 1110. The first main flow channels 11313 need to be connected to the branch flow channels 11321. When a first main flow channel 11313 is connected to one or more branch flow channels 11321, a first node 11331 will be formed at the connection position. The first node 11331 can also be directly understood as a node structure. By arranging all the first node sections 11331 formed between the first main flow channel 11313 and the branch flow channel 11321 within the boundary area 1133, the first connecting section will not appear in the functional area 1132. This allows for better control over the number and arrangement of the first node sections 11331, ensuring that the first node sections 11331 are distributed on one side of the functional area 1132 without extending into its interior. Consequently, the flow channels in the functional area 1132 will not contain the first node sections 11331, thus eliminating flow resistance and pressure drop issues caused by flow splitting and merging. This improves the temperature uniformity and heat exchange capacity of the functional area 1132.

[0097] For branch flow channels 11321, branch flow channels 11321 can be arranged into one or more interconnected heat exchange loops to form a circulating flow path for the refrigerant. That is, a loop formed by multiple interconnected branch flow channels 11321 can be formed within functional area 1132, or multiple loops formed by multiple interconnected branch flow channels 11321 can be formed within functional area 1132.

[0098] The first direction X and the second direction Y are two perpendicular directions. For example, the first direction X is the length direction of the refrigerant heat exchange component 1130 (or the first surface 1135), and the second direction Y is the width direction of the refrigerant heat exchange component 1130.

[0099] In this embodiment, the first main flow channel 11313 and the branch flow channels 11321 are respectively arranged in the non-functional area 1131 and the functional area 1132. This allows the first node portions 11331 between the first main flow channel 11313 and each branch flow channel 11321 to be evenly distributed in the boundary area 1133 where the functional area 1132 and the non-functional area 1131 intersect. Within the functional area 1132, no connecting nodes are formed where the flow channels intersect. This reduces the resistance and pressure loss of the refrigerant in the branch flow channels of the functional area 1132, making the refrigerant flow smoother. This improves the uniformity of temperature distribution on the refrigerant heat exchange component 1130 and increases the heat exchange efficiency, thereby achieving the purpose of balancing and rapidly exchanging heat on the battery cell assembly 1110.

[0100] In some embodiments, refer to Figure 5 and Figure 6 As shown, each branch channel 11321 extends along the first direction X and is arranged at intervals in the second direction Y.

[0101] Specifically, each branch flow channel 11321 extends along the first direction X. Therefore, each branch flow channel 11321 can be understood as a direct current channel structure. Multiple direct current channel structures can be connected at one or both ends of the first direction X. For example, as shown in the figure, some branch flow channels 11321 are connected to adjacent branch flow channels 11321 at the right end of the first direction X to form one or more flow loops. Alternatively, as shown in the figure, some branch flow channels 11321 are connected to adjacent branch flow channels 11321 at both the left and right ends of the first direction X to form one or more flow loops. These flow loops may have parallel connection positions, but these connection positions cannot be understood as the aforementioned first node positions, because the flow channels at these positions are connected in parallel and do not create flow resistance between the main road and the branch road. Alternatively, the flow resistance at these positions is very small compared to the flow resistance at the connection position between the first main road flow channel 11313 and the branch flow channel 11321, and can be ignored.

[0102] Each branch flow channel 11321 extends in the first direction X and is arranged at intervals in the second direction Y, thereby forming a rectangular arrangement area. Since each branch flow channel 11321 is opposite to the first surface 1135 of the refrigerant heat exchange component 1130, a heat exchange surface 1134 is formed on the first surface 1135. The heat exchange surface 1134 is the area that matches and is opposite to each branch flow channel 11321 on the first surface 1135.

[0103] In this embodiment, since each branch flow channel 11321 is arranged to extend along the first direction X, no first node 11331 will be generated within the functional area 1132. The refrigerant can flow more smoothly in the functional area 1132, thereby improving the uniformity of temperature distribution on the refrigerant heat exchange component 1130 and improving the heat exchange efficiency, so as to achieve the purpose of balancing and rapidly exchanging heat on the battery cell assembly 1110.

[0104] In some embodiments, the cross-sectional area of ​​each first main channel 11313 is the same as the cross-sectional area of ​​each branch channel 11321.

[0105] In related technologies, the cross-sectional area of ​​the flow channel corresponding to the non-functional area 1131 is larger, while the cross-sectional area of ​​the flow channel corresponding to the functional area 1132 is smaller than that of the flow channel in the non-functional area 1131. However, if the width of the flow channel is too small, it may lead to an increase in the flow resistance of the refrigerant. It is known that when the refrigerant flows from the non-functional area 1131 into the functional area 1132, the resistance in the flow channel will increase, and excessive resistance may reduce the heat exchange effect. In addition, in the direct cooling heat exchange method using refrigerant, the heat exchange refrigerant will gradually change from a liquid state or a two-phase gaseous state to a single-phase gaseous state during the flow process. It is known that the flow rate of the refrigerant flowing into and out of the refrigerant heat exchange component 1130 is the same. When the refrigerant changes from a liquid to a gaseous state, its volume increases dramatically. When the refrigerant flows from the non-functional area 1131 into the functional area 1132, the increased volume, combined with a reduction in the cross-sectional area of ​​the flow channel corresponding to the functional area 1132, will inevitably create significant flow resistance. This leads to an increase in the pressure difference between the inlet and outlet pressures of the refrigerant heat exchange component 1130, resulting in a larger temperature difference between the inlet and outlet of the refrigerant. Consequently, the temperature distribution on the refrigerant heat exchange component 1130 becomes significantly uneven, resulting in poor temperature uniformity. This, in turn, affects the balanced heat exchange of the battery cell assembly 1110, impacting the performance and lifespan of the battery device 1100.

[0106] Therefore, in this example, the cross-sectional area of ​​the first main flow channel 11313 of the non-functional area 1131 is made equal to the cross-sectional area of ​​each branch flow channel 11321. This makes the flow resistance of the refrigerant relatively stable when it flows from the non-functional area 1131 into the functional area 1132, that is, when the refrigerant flows from the first main flow channel 11313 into the branch flow channel 11321. It is less prone to drastic fluctuations, which helps to reduce pressure loss (i.e., pressure drop). This, in turn, reduces the temperature difference between the inlet and outlet of the refrigerant heat exchange component 1130, making the temperature distribution on the refrigerant heat exchange component 1130 more uniform and improving the temperature uniformity performance. This, in turn, enhances the effect of the refrigerant heat exchange component 1130 on the balanced heat exchange of the battery cell assembly 1110.

[0107] In addition, it should be noted that the cross-sectional areas of the first main road flow channel 11313 and each branch flow channel 11321 are the same or equal. This should be understood as the cross-sectional areas of the first main road flow channel 11313 and each branch flow channel 11321 being very close, but a certain design error is allowed. For example, if the ratio of the cross-sectional area of ​​the first main road flow channel 11313 to the cross-sectional area of ​​the branch flow channel 11321 is within the range of 0.95-1.05, it can be considered equal or the same.

[0108] In this embodiment, the cross-sectional area of ​​the first main flow channel 11313 is equal to that of the branch flow channel 11321, which is beneficial to improve the flow resistance change during the refrigerant flow process and to reduce the flow resistance. The flow resistance is less likely to fluctuate drastically, which is beneficial to reduce pressure loss (i.e., pressure drop). This reduces the temperature difference between the inlet and outlet of the flow channel, resulting in a more uniform temperature distribution on the refrigerant heat exchange component 1130 and improved temperature uniformity. This, in turn, enhances the effect of the refrigerant heat exchange component 1130 on the balanced heat exchange of the battery cell assembly 1110.

[0109] In some embodiments, refer to Figure 5 and Figure 6 As shown, functional area 1132 includes multiple main heat exchange channels 11336, which are arranged in parallel in the second direction Y. Each main heat exchange channel 11336 includes multiple interconnected branch channels 11321.

[0110] Multiple main heat exchange channels 11336 are provided, and these channels are arranged at intervals and connected in the second direction Y to form a parallel flow channel structure. Each main heat exchange channel 11336 includes multiple branch channels 11321, which are all arranged along the first direction X. The branch channels 11321 in each main heat exchange channel 11336 can also be arranged at intervals in the second direction Y. This results in the functional area 1132 being arranged in a rectangular shape. Within this area, no nodes are formed in each main heat exchange channel 11336, allowing the refrigerant to flow back and forth in the first direction X, making the refrigerant flow smoother.

[0111] In addition, a main heat exchange channel 11336 can be understood as a loop, so multiple loops can be formed in the second direction Y. Each loop can exchange heat with a portion of the battery cell assembly 1110, which helps to make the heat exchange of the refrigerant heat exchange component 1130 to the battery cell 1112 more sufficient and uniform.

[0112] In this embodiment, multiple branch flow channels 11321 are arranged in parallel with multiple main heat exchange flow channels 11336, thereby forming multiple independent circulation loops. This facilitates the control of multiple circulation loops to perform targeted heat exchange on the battery cell assembly 1110, which helps to improve the uniformity of heat exchange.

[0113] In some embodiments, refer to Figure 7 and Figure 8 As shown, the refrigerant heat exchange component 1130 has a first surface 1135 opposite to the battery cell assembly 1110; the battery cell assembly 1110 includes multiple rows of battery cell groups 1111, each row of battery cell groups 1111 includes multiple battery cells 1112 stacked in a first direction X, the multiple rows of battery cell groups 1111 are arranged side by side in a second direction Y, and the projected area of ​​each row of battery cell groups 1111 on the first surface 1135 covers at least one main heat exchange channel 11336.

[0114] For the battery cell assembly 1110, the battery cell assembly 1110 includes multiple rows or multiple battery cell groups 1111. The multiple rows of battery cell groups 1111 are arranged side by side in the second direction Y. Each row of battery cell group 1111 includes multiple battery cells 1112. The battery cells 1112 can be cubic or cylindrical. The battery cells 1112 in each row of battery cell group 1111 are all stacked and arranged sequentially along the first direction X.

[0115] Multiple main heat exchange channels 11336 are arranged at intervals and connected in the second direction Y to form a parallel flow channel structure. It can be seen that the multiple main heat exchange channels 11336 and multiple rows of battery cell groups 1111 are arranged in sequence in the second direction Y. Multiple battery cells 1112 in each row of battery cell groups 1111 are arranged in sequence along the extension direction of the main heat exchange channels 11336.

[0116] The refrigerant heat exchange component 1130 has a first surface 1135. A battery cell assembly 1110 is disposed opposite to the first surface 1135. The area on the first surface 1135 corresponding to the battery cell assembly 1110 forms a heat exchange surface 1134. The area on the first surface 11336 corresponding to each main heat exchange channel 11336 is also a heat exchange surface 1134. Each row of battery cells 1111 forms a projection area on the first surface 1135, such that the projection area of ​​each row of battery cells 1111 on the first surface 1135 covers at least one main heat exchange channel 11336.

[0117] One possible scenario is that the projected area of ​​each row of battery cells 1111 on the first surface 1135 covers a main heat exchange channel 11336. That is, one main heat exchange channel 11336 provides targeted heat exchange for one row of battery cells 1111. Each row of battery cells 1111 will exchange heat through one main heat exchange channel 11336. As long as the structure of each main heat exchange channel 11336 is the same, and the flow rate, pressure and other data of the refrigerant in each main heat exchange channel 11336 are the same, it can be known that the heat exchange capacity of each main heat exchange channel 11336 is the same. Therefore, balanced heat exchange for each row of battery cells 1111 can be achieved.

[0118] In some cases, the projected area of ​​each row of battery cells 1111 on the first surface 1135 may cover one main heat exchange channel 11336 and a portion of an adjacent main heat exchange channel 11336. Alternatively, the projected area of ​​each row of battery cells 1111 on the first surface 1135 may cover multiple main heat exchange channels 11336, thereby enhancing the heat exchange capacity of the main heat exchange channels 11336 for each row of battery cells 1111. To improve the effect of balanced heat exchange, the number of main heat exchange channels 11336 corresponding to each row of battery cells 1111 may be the same, where the number may be a fraction or decimal. For example, the projected area of ​​each row of battery cells 1111 on the first surface 1135 may cover one main heat exchange channel 11336 and half of an adjacent main heat exchange channel 11336.

[0119] In this embodiment, the battery cell assembly 1110 is arranged into multiple rows of battery cell groups 1111. Corresponding to each row of battery cell groups 1111, the refrigerant heat exchange component 1130 forms multiple main heat exchange channels 11336 arranged accordingly. The multiple main heat exchange channels 11336 are connected in parallel in the arrangement direction of the battery cell groups 1111, and the extension direction of each main heat exchange channel 11336 is consistent with the arrangement direction of the multiple battery cells 1112 in each row of battery cell groups 1111. This allows the multiple battery cells 1112 in each row of battery cell groups 1111 to have a larger heat exchange area with the main heat exchange channels 11336. Each main heat exchange channel 11336 can more effectively exchange heat with each battery cell group 1111, which is beneficial to improving the effect of balanced heat exchange.

[0120] In some embodiments, refer to Figure 5 , Figure 6 , Figure 9 and Figure 10 As shown, the refrigerant heat exchange component 1130 has a first surface 1135 opposite to the battery cell assembly 1110, and the area of ​​the projected region of the battery cell assembly 1110 on the first surface 1135 is greater than or equal to 1m². 2In this case, the number of first node parts 11331 is 2-20.

[0121] Considering that each first node 11331 will have an adverse effect on the flow resistance and pressure of the refrigerant, if the number of first node 11331 is too large, the flow resistance and pressure drop will increase, and if the number of first node 11331 is too small, it will easily cause insufficient flow distribution. Therefore, the number of first node 11331 should be controlled within a reasonable range as much as possible.

[0122] In this example, the projected area of ​​the battery cell assembly 1110 on the first surface 1135 of the refrigerant heat exchange component 1130 is used as the trigger condition to precisely limit the number of first node parts 11331 to 2-20. Since the projected area of ​​the battery cell assembly 1110 on the first surface 1135 of the refrigerant heat exchange component 1130 is directly related to the actual heat exchange contact area of ​​the battery cell assembly 1110, designing based on the above-mentioned projected area is beneficial to make the number of first node parts 11331 more accurate and better fit the influence of battery layout on thermal management.

[0123] When the projected area of ​​the battery cell assembly 1110 on the first surface 1135 of the refrigerant heat exchange component 1130 is greater than or equal to 1m² 2 This means that the effective contact area between the battery cell assembly 1110 and the refrigerant heat exchange component 1130 is large, requiring more first node sections 11331 to achieve refrigerant diversion. If the number of first node sections 11331 is less than 2, it will affect the arrangement of the branch flow channels 11321, making it difficult for the refrigerant to fully cover the projected area, easily leading to insufficient heat exchange capacity of the refrigerant heat exchange component 1130 itself; if the number of first node sections 11331 is greater than 20, the number of first node sections 11331 is too large, resulting in increased flow resistance and pressure drop, and the excessive density of branch flow channels 11321 will affect the load-bearing capacity of the flow channel walls. In addition, the manufacturing process of the refrigerant heat exchange component 1130 is complex and the cost increases dramatically. Through thermal flow simulation and experimental verification, a number of 2-20 nodes can balance the diversion uniformity and flow efficiency, so that the refrigerant heat exchange component 1130 has better temperature uniformity and heat exchange capacity.

[0124] In this embodiment, the area of ​​the projected region of the battery cell assembly 1110 on the first surface 1135 is used as the trigger condition, and the trigger condition is when the projected area is greater than or equal to 1m². 2 In this case, arranging 2-20 first node sections 11331 is more conducive to giving the refrigerant heat exchange component 1130 better temperature uniformity and heat exchange capacity.

[0125] In some embodiments, refer to Figure 5 , Figure 6 , Figure 9 and Figure 10 As shown, the refrigerant heat exchange component 1130 has a first surface 1135 opposite to the battery cell assembly 1110, and the area of ​​the projected region of the battery cell assembly 1110 on the first surface 1135 is less than 1m². 2 In this case, the number of first node parts 11331 is 2-15.

[0126] The projected area of ​​the battery cell assembly 1110 on the first surface 1135 is less than 1m². 2 In this case, the number of first node sections 11331 should be narrowed to 2-15. (For sections less than 1m) 2 With a limited projected area, the heat exchange zone is limited. More than 15 nodes would result in overly narrow branch channels and redundant refrigerant distribution, potentially leading to uneven flow due to local resistance differences. Conversely, fewer than 2 nodes would fail to meet the flow distribution requirements, significantly increasing the risk of refrigerant accumulation in the central area and refrigerant depletion in the peripheral areas. Through heat flow simulation and experimental verification, 2-15 nodes can achieve efficient refrigerant distribution within a small area.

[0127] In this embodiment, the area of ​​the projected region of the battery cell assembly 1110 on the first surface 1135 is used as the trigger condition, and the projected area is less than 1m². 2 In this case, the layout of 2-15 first node parts 11331 can reduce the risk of increasing the weight of the ineffective structure due to node redundancy, and can reduce the risk of performance degradation caused by local temperature difference through reasonable node layout, so as to improve the temperature uniformity and heat exchange capacity of the refrigerant heat exchange component 1130.

[0128] In some embodiments, refer to Figure 5 , Figure 6 , Figure 9 and Figure 10 As shown, the refrigerant heat exchange component 1130 has a first surface 1135 opposite to the battery cell assembly 1110, and the number of first node portions 11331 is at least 2. For every 0.5 square meter increase in the area of ​​the projected region of the battery cell assembly 1110 on the first surface 1135, the number of first node portions 11331 should increase by 1-4.

[0129] Specifically, when the projected area of ​​the battery cell assembly 1110 on the first surface 1135 increases, the refrigerant heat exchange component 1130 needs to have a stronger heat exchange capacity, which essentially means that a larger area of ​​refrigerant needs to circulate inside the refrigerant heat exchange component 1130. If the increased projected area of ​​the battery cell assembly 1110 on the first surface 1135 is addressed by extending the path of each branch flow channel 11321, the refrigerant flow rate will decrease due to the extended path, resulting in insufficient heat dissipation for the distant battery cell assembly 1110. Therefore, more branch flow channels 11321 should be arranged. To avoid affecting the diversion capacity, while increasing the branch flow channels 11321, a first main flow channel 11313 should be arranged accordingly, so that the first main flow channel 11313 can connect to one or more branch flow channels 11321.

[0130] Generally, at least two main heat exchange channels 11336 need to be arranged in the refrigerant heat exchange component 1130. The two main heat exchange channels 11336 are arranged symmetrically in the second direction Y. One main heat exchange channel 11336 will form a first node 11331 at the inlet and outlet positions respectively. Therefore, it can be seen that at least two first node 11331 should be arranged in the refrigerant heat exchange component 1130.

[0131] Based on the above, and after extensive experimental analysis, for every 0.5m² increase in the projected area of ​​the battery cell module 1110 on the first surface 1135, the... 2 It is advisable to consider adding 1-4 first node sections 11331, which is equivalent to adding 1-2 main heat exchange channels 11336.

[0132] In this embodiment, when the heat exchange area required for the battery cell assembly 1110 increases, for every 0.5m increase... 2 To increase the heat exchange area, the number of main heat exchange channels 11336 should be increased, which will help reduce the problem of uneven temperature distribution caused by extending the flow path of a main heat exchange channel 11336, and thus help improve the heat exchange balance and heat exchange capacity.

[0133] In some embodiments, refer to Figure 5 , Figure 6 and Figure 9-11As shown, the first node section 11331 is divided into a first branch node section 11335 and a first confluence node section 11334; each main heat exchange channel 11336 includes an upstream channel 11337 and a downstream channel 11338 that are connected to each other, and each upstream channel 11337 and each downstream channel 11338 includes at least one branch channel 11321; the first trunk channel 11313 includes multiple first sub-trunk channels 11315 and multiple second sub-trunk channels 1 1316, each of the first sub-main flow channels 11315 is connected to each of the branch flow channels 11321 in the upstream flow channel 11337 of each main heat exchange flow channel 11336 and forms a first branch node 11335 at the connection position. Each of the second sub-main flow channels 11316 is connected to each of the branch flow channels 11321 in the downstream flow channel 11338 of each main heat exchange flow channel 11336 and forms a first confluence node 11334 at the connection position.

[0134] Specifically, for each main heat exchange channel 11336, each main heat exchange channel 11336 includes an upstream channel 11337 and a downstream channel 11338. The upstream channel 11337 can be understood as an inlet channel, and the downstream channel 11338 can be understood as a loop channel, with the refrigerant flowing from the upstream channel 11337 into the downstream channel 11338. The upstream channel 11337 may include one or more branch channels 11321, and the downstream channel 11338 may also include one or more branch channels 11321. The multiple branch channels 11321 can be arranged at intervals in the second direction Y. In one case, one branch channel 11321 of the upstream channel 11337 is connected to one branch channel 11321 of the downstream channel 11338, forming a small flow loop. In another case, multiple branch channels 11321 in the upstream channel 11337 can be arranged in parallel, or multiple branch channels 11321 in the downstream channel 11338 can also be arranged in parallel.

[0135] For the first main flow channel 11313, the first main flow channel 11313 includes multiple first sub-main flow channels 11315 and multiple second sub-main flow channels 11316. The first sub-main flow channels 11315 can be considered as flow channels in the inflow direction. Each first sub-main flow channel 11315 should be connected to the upstream flow channel 11337 (specifically, the branch flow channel 11321 in the upstream flow channel 11337) in each main heat exchange flow channel 11336. The position where the first sub-main flow channel 11315 connects to the upstream flow channel 11337 forms a cross node. This cross node is the first branch node 11335 in the first node part 11331. Correspondingly, the second sub-main channel 11316 can be considered as a channel in the outflow direction. Each second sub-main channel 11316 should be connected to the downstream channel 11338 (specifically, the branch channel 11321 in the downstream channel 11338) in each main heat exchange channel 11336. The position where the second sub-main channel 11316 connects to the downstream channel 11338 forms a cross node, which is the first confluence node 11334 in the first node section 11331.

[0136] Each heat exchange loop should be formed by sequentially connecting the first sub-main flow channel 11315, the upstream flow channel 11337 and the downstream flow channel 11338 of each main heat exchange flow channel 11336, and the second main flow channel 11314 to form a flow loop. The first sub-main flow channel 11315 and one main heat exchange flow channel 11336 respectively form a first branch node 11335 and a first convergence node 11334.

[0137] In this embodiment, by rationally arranging the first main flow channel 11313 and each main heat exchange flow channel 11336, each first node 11331 is arranged at one end of each main heat exchange flow channel, so that no branching or merging nodes are formed in the part of the functional area 1132 that is mainly used for heat exchange, thereby improving the smoothness of refrigerant flow.

[0138] In some embodiments, refer to Figure 5 and Figure 6 As shown, the upstream flow channel 11337 in some or all of the main heat exchange flow channels 11336 is arranged adjacent to the upstream flow channel 11337 in the adjacent main heat exchange flow channels 11336, and the downstream flow channel 11338 in some or all of the main heat exchange flow channels 11336 is arranged adjacent to the downstream flow channel 11338 in the adjacent main heat exchange flow channels 11336.

[0139] Specifically, since multiple main heat exchange channels 11336 are arranged in parallel in the second direction Y, there must be two main heat exchange channels 11336 arranged adjacent to each other, and multiple sets of such adjacent main heat exchange channels 11336 can be set.

[0140] Since the upstream flow channel 11337 in the main heat exchange channel 11336 is connected to the first sub-main flow channel 11315, and the upstream flow channels 11337 in the two main heat exchange channels 11336 are arranged adjacently, it can be seen that the two first sub-main flow channels 11315 will form an adjacent arrangement. Since the refrigerant flow direction in the first sub-main flow channel 11315 is the same, the purpose of centrally arranging the first sub-main flow channels 11315 with the same flow direction can be achieved, which can facilitate transportation and connection with external transportation channels (such as the first flow direction channel 11311). Similarly, the downstream flow channel 11338 in the main heat exchange flow channel 11336 will be connected to the second sub-main flow channel 11316. The downstream flow channels 11338 in the two main heat exchange flow channels 11336 are arranged adjacently. It can be seen that the two second sub-main flow channels 11316 will form an adjacent arrangement. Since the refrigerant flow direction in the second sub-main flow channels 11316 is the same, the purpose of centrally arranging the second sub-main flow channels 11316 with the same flow direction can be achieved, which can facilitate transportation and connection with external transportation channels (such as the second flow channel 11312).

[0141] In this embodiment, the upstream flow channel 11337 or the downstream flow channel 11338 of the two adjacent main heat exchange flow channels 11336 are arranged adjacently, thereby making the first trunk flow channel 11313 of the non-functional area 1131 more regularly arranged.

[0142] In some embodiments, refer to Figure 5 As shown, the non-functional area 1131 also includes a first flow channel 11311 and a second flow channel 11312. The first flow channel 11311 is connected to the first sub-main road flow channel 11315, and the second flow channel 11312 is connected to the second sub-main road flow channel 11316. Along the second direction Y, the first flow channel 11311 and the second flow channel 11312 are both distributed in the central region of the non-functional area 1131.

[0143] Specifically, on the first surface 1135, a symmetrical axis extending along the first direction X can be set at the middle of the second direction Y. The first flow channel 11311 and the second flow channel 11312 can be arranged at one end of the symmetrical axis and in the region close to the symmetrical axis. That is, the first flow channel 11311 and the second flow channel 11312 are arranged in the middle region of the non-functional area 1131 along the second direction Y.

[0144] The multiple main heat exchange channels 11336 on both sides of the axis of symmetry can be arranged symmetrically, which helps to make the temperature distribution in the region on both sides of the axis of symmetry symmetrical. The flow characteristics of the refrigerant in each main heat exchange channel 11336 on both sides of the axis of symmetry are more consistent. The pressure, flow rate and other parameters of each main heat exchange channel 11336 on both sides of the axis of symmetry are similar, which helps to make the refrigerant evenly distributed in the branch channel 11321. This helps to reduce the problem of uneven refrigerant distribution caused by unreasonable channel arrangement, and further improves the uniformity and efficiency of heat exchange.

[0145] The first flow channel 11311 and the second flow channel 11312 are arranged in the middle region of the non-functional area 1131 along the second direction Y, so that the refrigerant can be uniformly delivered from the center of symmetry to both sides of the axis of symmetry, which makes the refrigerant distribution in the main heat exchange channel 11336 on both sides of the axis of symmetry more symmetrical and uniform.

[0146] In this embodiment, the first flow channel 11311 and the second flow channel 11312 are arranged in the middle region of the non-functional area 1131 along the second direction Y, which is beneficial to achieve uniform and symmetrical distribution of the refrigerant after it enters the refrigerant flow channel component.

[0147] In some embodiments, refer to Figure 5 As shown, there are at least two first trunk flow channels 11313 intersecting and merging.

[0148] Specifically, intersecting flow refers to two or more primary trunk flow channels 11313 intersecting and merging again to form a total trunk flow channel, which helps to save space, make reasonable layout, and improve space utilization.

[0149] For example, for two adjacent upstream channels 11337 in two adjacent main heat exchange channels 11336, the non-functional area 1131 needs to be configured with two first trunk channels 11313, so that one first trunk channel 11313 is connected to one upstream channel 11337. In order to save space, the two first trunk channels 11313 can cross and merge at the end away from the upstream channel 11337, thereby forming a total trunk channel; equivalent to a total trunk channel being split by nodes to form two first trunk channels 11313.

[0150] In this embodiment, by merging multiple first main flow channels 11313, it is beneficial to save space in the non-functional area 1131 and improve space utilization.

[0151] In some embodiments, refer to Figure 9 , Figure 10 and Figure 12As shown, functional area 1132 includes a first flow channel area 11322 and a second flow channel area 11323 arranged along a first direction X. Each branch flow channel 11321 is distributed in the first flow channel area 11322 and the second flow channel area 11323. A boundary area 1133 is formed between the first flow channel area 11322 and the non-functional area 1131. The non-functional area 1131 also includes a second main flow channel 11314. Functional area 1132 also includes at least one guide flow channel 11339. One end of the guide flow channel 11339 is connected to a portion of the branch flow channels 11321 and forms a second node portion 11332 at the connection position. The other end of the guide flow channel 11339 is connected to the second main flow channel 11314 and forms a third node portion 11333 at the connection position. The second node portion 11332 is distributed in the second flow channel area 11323, and the third node portion 11333 is distributed in the boundary area 1133.

[0152] Specifically, the boundary area 1133 can be considered as the area at one end of the functional area 1132 in the first direction X, so that the first node part 11331 is distributed in the boundary area 1133, thereby minimizing the distribution of intersecting nodes in the functional area 1132, thereby reducing the impact of intersecting nodes on the refrigerant flow in the functional area 1132.

[0153] However, in some cases, each main heat exchange channel 11336 will have at least one first node 11331 located at the inlet of the upstream channel 11337 and at least one first node 11331 located at the outlet of the downstream channel 11338. When there are a large number of main heat exchange channels 11336, the distribution of the first nodes 11331 in the boundary area 1133 is too dense, which is not conducive to the smooth flow of the refrigerant and can easily cause the channel wall of the first node 11331 to be relatively weak.

[0154] Therefore, the branch channels 11321 within the functional area 1132 are divided into a first channel area 11322 and a second channel area 11323 arranged left and right in the first direction X. Each branch channel 11321 is mainly distributed in the first channel area 11322. It can be seen that the second channel area 11323 should be the end of the functional area 1132 away from the non-functional area 1131, and the first main channel 11313 is connected to some of the branch channels 11321, and some of the branch channels 11321 are connected to each other. By setting a guide channel 11339 in the functional area 1132, one end of the guide channel 11339 is connected to some of the branch channels 11321, and the connection position forms a second node part 11332, so that the second node part 11332 is located in the second channel area 11323. A second trunk flow channel 11314 is further arranged in the non-functional area 1131, so that the other end of the guide flow channel 11339 extends to the non-functional area 1131 and connects with the second trunk flow channel 11314. The connection position forms the third node 11333, which is located in the boundary area 1133.

[0155] The above structural design is equivalent to reducing the number of first node parts 11331, thereby arranging some second node parts 11332 at the position of the second flow channel area 11323, thereby reducing the flow channel density in the boundary area 1133 and reducing the flow pressure in the boundary area 1133, making the structural arrangement of the first node parts 11331 and the second node parts 11332 more reasonable.

[0156] In this embodiment, by adding a guide channel 11339, a small number of second node portions 11332 can be arranged in the second channel region 11323, and the number of first node portions 11331 in the boundary region 1133 is relatively reduced, thereby reducing the arrangement density of first node portions 11331 in the boundary region 1133 and alleviating the flow pressure. In addition, the first channel region 11322 is mainly used for heat exchange with the battery cell 1112, and a cross node for diversion and convergence is set in this region, which is beneficial to improving the overall heat exchange capacity and temperature uniformity of the refrigerant heat exchange component 1130.

[0157] In some embodiments, the cross-sectional areas of the first main flow channel 11313, the second main flow channel 11314, the branch flow channel 11321, and the guide flow channel 11339 are all the same.

[0158] Similarly, considering the changes in refrigerant volume when the refrigerant flows between non-functional area 1131 and functional area 1132, and between the first flow channel area 11322 and the second flow channel area 11323, the change in the cross-sectional area of ​​the flow channel at the intersection node will affect the smoothness of the refrigerant flow. Therefore, the cross-sectional areas of the flow channels at both ends of the intersection node should be equal. This ensures that when the refrigerant flows from the non-functional area 1131 into the functional area 1132, that is, when the refrigerant flows from the first main channel 11313 through the first node 11331 into the branch channel 11321, the flow resistance effect on the refrigerant remains relatively stable and is not prone to drastic fluctuations. Furthermore, when the refrigerant enters the guide channel 11339 from the branch channel 11321 through the second node 11332, and when the refrigerant enters the second main channel 11314 from the guide channel 11339 through the third node 11333, the branch channels 11321 and... The cross-sectional areas of the guide channels 11339 are equal, and the cross-sectional areas of the guide channels 11339 and the second main channel 11314 at both ends of the third node 11333 are equal, so that the flow resistance of the refrigerant remains relatively stable and is not prone to drastic fluctuations. This helps to reduce pressure loss (i.e., pressure drop), thereby reducing the temperature difference between the two ends of the refrigerant heat exchange component 1130 at the node. This makes the temperature distribution on the refrigerant heat exchange component 1130 more uniform, improves the temperature uniformity performance, and enhances the effect of the refrigerant heat exchange component 1130 on the balanced heat exchange of the battery cell assembly 1110.

[0159] In addition, it should be noted that the cross-sectional areas of the first main flow channel 11313, each branch flow channel 11321, the guide flow channel 11339, and the second main flow channel 11314 are the same or equal. This should be understood as the cross-sectional areas of the first main flow channel 11313, each branch flow channel 11321, the guide flow channel 11339, and the second main flow channel 11314 being very close, but a certain design error is allowed. For example, if the error range is controlled within ±%, they can be considered equal or the same.

[0160] In this embodiment, the cross-sectional areas of the first main flow channel 11313, the second main flow channel 11314, the branch flow channel 11321, and the guide flow channel 11339 are all the same, which helps to improve the flow resistance changes during the refrigerant flow process and reduces the flow resistance. The flow resistance is less likely to fluctuate drastically, which helps to reduce pressure loss (i.e., pressure drop). This reduces the temperature difference between the inlet and outlet of the flow channel, resulting in a more uniform temperature distribution on the refrigerant heat exchange component 1130 and improved temperature uniformity. This, in turn, enhances the effect of the refrigerant heat exchange component 1130 on the balanced heat exchange of the battery cell assembly 1110.

[0161] In some embodiments, refer to Figure 13-15As shown, the refrigerant heat exchange component 1130 has a first surface 1135 and a second surface opposite to each other. The first surface 1135 is disposed opposite to the battery cell assembly 1110. The refrigerant heat exchange component 1130 includes a plurality of mounting holes 1139, which are disposed through the first surface 1135 and the second surface and are disposed to avoid the first main flow channel 11313 and the branch flow channel 11321.

[0162] Specifically, the first surface 1135 and the second surface are two opposing surfaces of the refrigerant heat exchange component 1130. The battery cell assembly 1110 can be arranged opposite to the first surface 1135, and the heat exchange surface 1134 is a part of the first surface 1135.

[0163] The main function of the mounting hole 1139 is to facilitate a stable connection between the refrigerant heat exchange component 1130 and other structures within the battery device 1100. For example, by inserting bolts, rivets, or other connectors through the mounting hole 1139, the refrigerant heat exchange component 1130 can be installed at a specific position on the housing assembly 1120 or the vehicle 1000, thereby fixing the refrigerant heat exchange component 1130 and reducing vibration and displacement of the refrigerant heat exchange component 1130 during the operation of the battery device 1100.

[0164] The mounting hole 1139 can be a through hole structure, so that the mounting hole 1139 forms a connecting hole that passes through the first surface 1135 and the second surface. The mounting hole 1139 can be arranged in the functional area 1132. For example, the mounting hole 1139 can be arranged in the middle region of the functional area 1132 in the first direction X. The mounting hole 1139 can be arranged between two branch channels 11321 and is not connected to the branch channels 11321. For example, the mounting hole 1139 can be arranged between two branch channels 11321 in the upstream channel 11337 of the main heat exchange channel 11336. The mounting hole 1139 can also be arranged between two branch channels 11321 in the downstream channel 11338 of the main heat exchange channel 11336, or between a branch channel 11321 in the upstream channel 11337 of one main heat exchange channel 11336 and a branch channel 11321 in the downstream channel 11338 of another main heat exchange channel 11336.

[0165] The diameter of the mounting hole 1139 can be larger than the interval between two adjacent branch channels 11321. Then, the branch channel 11321 can be bent at the position opposite to the mounting hole 1139. That is to say, at the position opposite to the mounting hole 1139, the branch channel is bent, for example, it is bent in a semi-circular shape.

[0166] In this embodiment, by providing mounting holes 1139, it is convenient to connect and fix the refrigerant heat exchange component 1130 to other components using bolts or other locking devices, thereby improving the ease of connection between the refrigerant heat exchange component 1130 and other components.

[0167] In some embodiments, refer to Figure 13-15 As shown, along the first direction X, a plurality of mounting holes 1139 are arranged in the middle region of the refrigerant heat exchange component 1130 and spaced apart along the second direction Y; and / or, along the second direction Y, a plurality of mounting holes 1139 are arranged in the middle region of the refrigerant heat exchange component 1130 and spaced apart along the first direction X.

[0168] Specifically, in the first direction X, the mounting holes 1139 are arranged in the central area of ​​the refrigerant heat exchange component 1130, which helps to make the force on the refrigerant heat exchange component 1130 more even during installation and fixing. When the refrigerant heat exchange component 1130 is connected and fixed to other components through these mounting holes 1139, since the mounting holes 1139 are located in the middle, the deformation or damage of the components caused by uneven force can be effectively reduced, which is beneficial to improving the mechanical stability of the refrigerant heat exchange component 1130.

[0169] Since the branch flow channels 11321 around the mounting hole 1139 need to form a curved structure for avoidance, in order to improve the structural consistency among multiple main heat exchange channels 11336, the mounting hole 1139 can be set between two adjacent main heat exchange channels 11336, and a curved structure is formed on each main heat exchange channel 11336, so that the structural form of each main heat exchange channel 11336 is consistent, which is conducive to improving the consistency of refrigerant flow in each main heat exchange channel 11336, thereby improving the temperature uniformity of the heat exchange surface 1134.

[0170] In the second direction Y, multiple mounting holes 1139 can be configured on a straight line parallel to the second direction Y to improve the regularity of the structural layout.

[0171] Optionally, in the second direction Y, the refrigerant heat exchange component 1130 has a central region, and along the second direction Y, a plurality of mounting holes 1139 are arranged in the central region of the refrigerant heat exchange component 1130 and spaced apart along the first direction X. In the first direction X, the plurality of mounting holes 1139 can be configured on a straight line parallel to the first direction X to improve the regularity of the structural layout.

[0172] Optionally, mounting holes 1139 are arranged in both the first direction X and the second direction Y, and the multiple mounting holes 1139 are arranged in a cross shape in the central area of ​​the refrigerant heat exchange component 1130.

[0173] In this embodiment, the multiple mounting holes 1139 are arranged in the middle of the refrigerant heat exchange component 1130 and are evenly distributed at intervals, which helps to improve the balance of force on the refrigerant heat exchange component 1130 and makes the layout between the main heat exchange channel 11336 and the mounting holes 1139 more regular.

[0174] In some embodiments, refer to Figure 5 and Figure 9 As shown, the refrigerant heat exchange component 1130 also has multiple cavities 1138 inside, and each cavity 1138 is configured to avoid the first main flow channel 11313 and the branch flow channel 11321.

[0175] Cavity 1138 can be understood as the hollow space inside the refrigerant heat exchange component 1130. For example, during the manufacturing process of the refrigerant heat exchange component 1130, the refrigerant heat exchange component 1130 includes an upper plate and a lower plate, which are welded together. During welding, a large amount of gas is generated. If this gas cannot be discharged in time, defects such as pores will form in the weld, reducing the welding quality and the sealing performance of the weld. As a structural cavity, cavity 1138 provides a discharge channel for the gas generated during welding, allowing the gas to escape smoothly, reducing welding defects caused by gas accumulation, thereby ensuring the quality and reliability of the welding, improving the sealing performance of the refrigerant heat exchange component 1130, and reducing the risk of refrigerant leakage.

[0176] Furthermore, by adding multiple cavities 1138 within the space outside the main heat exchange channel 11336, the overall structural strength of the refrigerant heat exchange component 1130 can be improved. The presence of the cavities 1138 alters the overall structure of the refrigerant heat exchange component 1130, giving it better mechanical properties. From a mechanical perspective, the cavities 1138 can serve as a reinforcing structure, effectively improving the bending and compressive strength of the refrigerant heat exchange component 1130. When the refrigerant heat exchange component 1130 is subjected to external forces, the cavities 1138 can disperse stress, reducing stress concentration and enabling the refrigerant heat exchange component 1130 to withstand greater external forces without deformation or damage. This improves the stability and reliability of the entire battery device 1100 and extends its service life.

[0177] Multiple cavities 1138 are disposed at one or both ends of the refrigerant heat exchange component 1130 along the first direction X.

[0178] In this embodiment, by setting multiple cavities 1138, the flow can be guided and the air can be vented during the welding process, which is beneficial to improving the welding quality and welding sealing, and also beneficial to improving the overall structural strength of the refrigerant heat exchange component 1130.

[0179] In some embodiments, refer to Figure 3As shown, the housing assembly 1120 includes a housing body 1121 with a receiving cavity 1124, and a refrigerant heat exchange component 1130 connected to the housing body 1121 and housed in the receiving cavity 1124; the refrigerant heat exchange component 1130 is disposed opposite to the battery cell assembly 1110.

[0180] Specifically, the box body 1121 may include a cover 1122, a box frame 1123, and a box bottom plate 1125. The cover 1122 and the box frame 1123 cover each other, and an opening is formed on the side of the box frame 1123 opposite to the cover 1122. It can be understood that the cover 1122 and the box frame 1123 are connected to form a groove structure with an opening. The box bottom plate 1125 is opposite to the cover 1122 and covers the opening. The cover 1122, the box frame 1123, and the box bottom plate 1125 together define a receiving cavity 1124 for accommodating the battery cell assembly 1110. The lid 1122 and the bottom plate 1125 can both be plate-like structures. The frame 1123 can be a hollow structure with openings at both ends. For example, the frame 1123 can be an annular frame structure. The lid 1122 covers one open side of the frame 1123, and the bottom plate 1125 is connected to the other open side (i.e., the open end) of the frame 1123. The lid 1122 can be positioned opposite to the bottom plate 1125. The body 1121 can be of various shapes, such as a cylinder or a cuboid.

[0181] The refrigerant heat exchange component 1130 can be connected to the housing body 1121 and housed in the housing cavity 1124 so as to face the bottom plate 1125. The battery cell assembly 1110 is opposite to the refrigerant heat exchange component 1130, so that it can exchange heat with the battery cell assembly 1110 and also support the battery cell assembly 1110.

[0182] In this embodiment, the refrigerant heat exchange component 1130 can be housed in the receiving cavity 1124 and disposed opposite to the battery cell assembly 1110, so that it can exchange heat with the battery cell assembly 1110 while also supporting the battery cell assembly 1110.

[0183] In some embodiments, refer to Figure 2 As shown, the housing assembly 1120 includes a housing body 1121 with an open opening, and a refrigerant heat exchange component 1130 connected to the housing body 1121 and covering the open opening to form a receiving cavity 1124; the refrigerant heat exchange component 1130 is disposed opposite to the battery cell assembly 1110.

[0184] Specifically, the housing body 1121 may include a cover 1122 and a frame 1123, which cover each other. An open opening is formed on the side of the frame 1123 opposite to the cover 1122. This can be understood as the cover 1122 and the frame 1123 being connected to form a groove structure with an open opening. The cover 1122, the frame 1123, and the refrigerant heat exchange component 1130 together define a receiving cavity 1124 for accommodating the battery cell assembly 1110. The cover 1122 may be a plate-like structure, and the frame 1123 may be a hollow structure with openings at both ends. For example, the frame 1123 may be an annular frame structure. The cover 1122 covers one open side of the frame 1123, and the refrigerant heat exchange component 1130 is connected to the other open side (i.e., the open opening) of the frame 1123. The cover 1122 may be disposed opposite to the refrigerant heat exchange component 1130. The box body 1121 can be of various shapes, such as cylinder, cuboid, etc.

[0185] The refrigerant heat exchange component 1130 can be connected to the housing body 1121. The refrigerant heat exchange component 1130 can form the bottom plate 1125 of the housing opposite to the battery cell assembly 1110. In this way, it can exchange heat with the battery cell assembly 1110 and also support the battery cell assembly 1110. This helps to simplify the structure of the external housing body 1121 and reduce the weight of the battery device 1100.

[0186] In this embodiment, the refrigerant heat exchange component 1130 can be connected to the box body 1121 and can form the box bottom plate 1125. This allows it to exchange heat with the battery cell assembly 1110 while also supporting the battery cell assembly 1110, which helps to simplify the structure of the external box body 1121 and reduce the weight of the battery device 1100.

[0187] In some embodiments, the main heat exchange channel 11336 is filled with a phase change medium.

[0188] Specifically, a phase change medium is a substance that can undergo a phase change at a specific temperature, absorbing or releasing a large amount of latent heat during the phase change process. In this example, a phase change medium is used as the heat exchange medium. When the battery cell assembly 1110 generates a large amount of heat during charging and discharging, the phase change medium in the main heat exchange channel 11336 absorbs the heat and undergoes a phase change, slowing down the rapid temperature rise of the battery device 1100. When the temperature of the battery device 1100 decreases, the phase change medium releases heat, mitigating the impact of excessively low battery temperature on performance. Using a phase change medium as the heat exchange medium helps maintain a relatively stable temperature for the battery device 1100, reducing problems such as capacity decay and shortened lifespan due to excessively high temperatures, or increased internal resistance and reduced charging and discharging efficiency due to excessively low temperatures, thereby improving the overall performance, reliability, and stability of the battery device 1100.

[0189] It should be noted that the phase change medium and the refrigerant can work together. For example, in a large-scale battery energy storage system, the refrigerant is responsible for transferring the heat generated by the battery cell module 1110 from the battery module to the heat dissipation end of the entire thermal management system, while the phase change medium is placed inside the battery module. When the battery cell module 1110 generates a large amount of heat in a short period of time, the phase change medium quickly absorbs the heat and undergoes a phase change, mitigating the rapid temperature rise and buying time for the refrigerant to further dissipate heat. The two work together to improve the efficiency and stability of the thermal management system.

[0190] In this embodiment, filling the main heat exchange channel 11336 with a phase change medium is beneficial to improving heat exchange efficiency and enhancing the performance stability of the battery device 1100.

[0191] In some embodiments, the refrigerant heat exchange component 1130 is formed from one or more of metals and non-metals.

[0192] Specifically, metallic materials, such as copper and aluminum, possess excellent thermal conductivity, enabling rapid heat transfer and allowing the refrigerant heat exchange component 1130 to efficiently dissipate the heat generated by the battery cell assembly 1110. Non-metallic materials, like ceramics, offer unique thermal performance advantages; for example, some ceramic materials exhibit high-temperature resistance, maintaining stable thermal conductivity even under high-temperature environments. Combining metallic and non-metallic materials fully leverages their respective thermal conductivity advantages, ensuring the refrigerant heat exchange component 1130 maintains high-efficiency thermal conductivity across different operating temperature ranges and heat load conditions, thereby enhancing the overall performance of the battery thermal management system.

[0193] In this embodiment, the material selection of the refrigerant heat exchange component 1130 is more flexible and varied, and it can be flexibly combined and prepared according to the heat exchange requirements of the battery device 1100, so that the refrigerant heat exchange component 1130 can maintain efficient heat conduction capability and improve the overall performance of the battery thermal management system.

[0194] In some embodiments, refer to Figure 2-4 As shown, the battery device 1100 also includes a connector component 1140, which is connected to the refrigerant heat exchange component 1130 and is correspondingly connected to the first flow channel 11311 and the second flow channel 11312 of the inlet and outlet areas.

[0195] Specifically, the connector component 1140 has a flow channel inlet and a flow channel outlet. The refrigerant flow channels in the inlet and outlet areas include multiple first flow channels 11311 and multiple second flow channels 11312. The flow channel inlet is connected to each of the first flow channels 11311, and the flow channel outlet is connected to each of the second flow channels 11312. The connector component 1140 can be connected to the refrigerant heat exchange component 1130 by welding, or the connector component 1140 can also be connected to the refrigerant heat exchange component 1130 by fasteners or other components. The connector component 1140 can be located on the upper part of the first surface 1135 and near the edge.

[0196] In this embodiment, by providing a connector component 1140, it is easy to connect to an external pipeline used for transporting heat exchange medium (i.e., heat exchange refrigerant), thereby improving the ease of assembly.

[0197] According to some embodiments of this application, refer to Figure 4 As shown, this application also provides a refrigerant heat exchange device, which includes the refrigerant heat exchange component 1130 in the battery device 1100 in any of the above embodiments.

[0198] The example of the refrigerant heat exchange device in this application is based on the example of the battery device 1100 described above. The structure of the refrigerant heat exchange component 1130 in the example of the battery device 1100 is the same as that of the refrigerant heat exchange component 1130 in this example, and the technical effects are the same. It will not be described again here. For details, please refer to the description of the battery device 1100 described above.

[0199] According to some embodiments of this application, this application also provides an energy storage device, which includes a power conversion device and the energy storage device in the above embodiments. The power conversion device is used to electrically connect the power generation device and the energy storage device.

[0200] Specifically, the energy storage device may include one or more battery clusters to increase the voltage and capacity of the energy storage device. A battery cluster may include multiple battery devices 1100, which are connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0201] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application embodiment can be any power system that requires energy storage devices.

[0202] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0203] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0204] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0205] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device 1100 via piping to regulate the temperature of the individual battery cells 1112.

[0206] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0207] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as an Insulation Monitoring Module (IMM), a Master Battery Management Unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0208] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in the energy storage system.

[0209] As an example, a power distribution module can be used to distribute power to modules in an energy storage device that require electricity.

[0210] According to some embodiments of this application, this application also provides an energy storage system, which includes a power conversion device and an energy storage device as described in the above embodiments. The power conversion device is used to electrically connect the power generation device and the energy storage device.

[0211] In some embodiments, the energy storage system may include one or more energy storage devices and a power conversion system (PCS), wherein the power conversion system is used to connect the power generation device and the energy storage device. The power generation device generates electrical energy, which can be stored in the energy storage device through the power conversion system. As examples, the power generation device may specifically be a solar panel, hydroelectric power generation device, thermal power generation device, wind power generation device, etc. The specific type of power generation device is not limited in this application.

[0212] According to some embodiments of this application, refer to Figure 1 As shown, this application also provides an electrical device, which includes the battery device 1100 in the above embodiments, the energy storage device in the above embodiments, or the energy storage system in the above embodiments. The battery device 1100 is used to store or provide electrical energy.

[0213] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells 1112, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles 1000, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0214] The examples of electrical devices in this application are based on the examples of the battery device 1100 described above. The examples of electrical devices include all the technical effects of the examples of the battery device 1100 described above, and will not be repeated here.

[0215] According to some embodiments of this application, this application also provides a charging network, which includes charging piles and energy storage devices or energy storage systems as described in the above embodiments, wherein the energy storage devices are used to provide electrical energy to the charging piles.

[0216] For example, the charging network includes charging stations and energy storage devices. The charging stations are electrically connected to the energy storage devices, which provide power to the charging stations. The charging stations are also electrically connected to a battery unit 1100 in the energy storage devices via cables. The battery unit 1100 can provide its stored electrical energy to the charging stations. The charging stations have one or more connectors for connecting to electrical devices (such as vehicle 1000) to replenish their power.

[0217] Energy storage devices can be located inside the charging pile (e.g., an integrated energy storage and charging unit) or outside the charging pile.

[0218] The above are merely preferred embodiments of this application, and only specifically describe the technical principles of this application. These descriptions are only for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application, as well as other specific embodiments of this application that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of this application.

Claims

1. A battery device (1100), characterized in that, include: The housing assembly (1120) has a receiving cavity (1124); A battery cell assembly (1110) is housed within the receiving cavity (1124); A refrigerant heat exchange component (1130) is configured to exchange heat with the battery cell assembly (1110). The refrigerant heat exchange component (1130) includes a functional area (1132) and a non-functional area (1131). The functional area (1132) and the non-functional area (1131) are arranged along a first direction (X) and form a boundary region (1133) extending along a second direction (Y) at their intersection. The non-functional area (1131) includes a plurality of first main flow channels (11313). The energy zone (1132) includes multiple branch channels (11321), each of the first main channels (11313) is connected to at least one of the branch channels (11321), and the position where each of the first main channels (11313) connects to the branch channel (11321) forms a first node (11331), and each of the first node (11331) is distributed in the boundary area (1133); the second direction (Y) is perpendicular to the first direction (X).

2. The battery device (1100) as claimed in claim 1, characterized in that, Each of the branch channels (11321) extends along the first direction (X) and is spaced apart in the second direction (Y).

3. The battery device (1100) as claimed in claim 1, characterized in that, The cross-sectional area of ​​each of the first main channel (11313) is the same as the cross-sectional area of ​​each of the branch channels (11321).

4. The battery device (1100) as claimed in claim 1, characterized in that, The functional area (1132) includes multiple main heat exchange channels (11336), which are arranged in parallel in the second direction (Y), and each main heat exchange channel (11336) includes multiple interconnected branch channels (11321).

5. The battery device (1100) as claimed in claim 4, characterized in that, The refrigerant heat exchange component (1130) has a first surface (1135) opposite to the battery cell assembly (1110); the battery cell assembly (1110) includes multiple rows of battery cell groups (1111), each row of battery cell groups (1111) includes multiple battery cells (1112) stacked in a first direction (X), the multiple rows of battery cell groups (1111) are arranged side by side in a second direction (Y), and the projection area of ​​each row of battery cell groups (1111) on the first surface (1135) covers at least one of the main heat exchange channels (11336).

6. The battery device (1100) according to any one of claims 1-5, characterized in that, The refrigerant heat exchange component (1130) has a first surface (1135) opposite to the battery cell assembly (1110), and the area of ​​the projected region of the battery cell assembly (1110) on the first surface (1135) is greater than or equal to 1m². 2 In this case, the number of the first node (11331) is 2-20.

7. The battery device (1100) according to any one of claims 1-5, characterized in that, The refrigerant heat exchange component (1130) has a first surface (1135) opposite to the battery cell assembly (1110), and the area of ​​the projected region of the battery cell assembly (1110) on the first surface (1135) is less than 1m². 2 In this case, the number of the first node (11331) is 2-15.

8. The battery device (1100) according to any one of claims 1-5, characterized in that, The refrigerant heat exchange component (1130) has a first surface (1135) opposite to the battery cell assembly (1110), and the number of the first node portions (11331) is at least 2. For every 0.5 square meter increase in the area of ​​the projected region of the battery cell assembly (1110) on the first surface (1135), the number of the first node portions (11331) should increase by 1-4.

9. The battery device (1100) as claimed in claim 4 or 5, characterized in that, The first node section (11331) is divided into a first branch node section (11335) and a first confluence node section (11334); each of the main heat exchange channels (11336) includes an upstream channel (11337) and a downstream channel (11338) that are connected to each other, and each of the upstream channel (11337) and each of the downstream channels (11338) includes at least one branch channel (11321); the first trunk channel (11313) includes a plurality of first sub-trunk channels (11315) and a plurality of second sub-trunk channels (11316). Each of the first sub-main flow channels (11315) is connected to each of the branch flow channels (11321) in the upstream flow channel (11337) of each of the main heat exchange flow channels (11336) and forms a first branch node (11335) at the connection position. Each of the second sub-main flow channels (11316) is connected to each of the branch flow channels (11321) in the downstream flow channel (11338) of each of the main heat exchange flow channels (11336) and forms a first confluence node (11334) at the connection position.

10. The battery device (1100) as claimed in claim 9, characterized in that, The upstream flow channel (11337) in some or all of the main heat exchange flow channels (11336) is arranged adjacent to the upstream flow channel (11337) in the adjacent main heat exchange flow channels (11336), and the downstream flow channel (11338) in some or all of the main heat exchange flow channels (11336) is arranged adjacent to the downstream flow channel (11338) in the adjacent main heat exchange flow channels (11336).

11. The battery device (1100) as claimed in claim 9, characterized in that, The non-functional area (1131) further includes a first flow channel (11311) and a second flow channel (11312). The first flow channel (11311) is connected to the first sub-main road flow channel (11315), and the second flow channel (11312) is connected to the second sub-main road flow channel (11316). Along the second direction (Y), the first flow channel (11311) and the second flow channel (11312) are both distributed in the central region of the non-functional area (1131).

12. The battery device (1100) as claimed in claim 9, characterized in that, There are at least two of the first trunk flow channels (11313) that intersect and merge.

13. The battery device (1100) according to any one of claims 1-5, characterized in that, The functional area (1132) includes a first flow channel area (11322) and a second flow channel area (11323) arranged along a first direction (X), and each of the branch flow channels (11321) is distributed in the first flow channel area (11322) and the second flow channel area (11323); the first flow channel area (11322) and the non-functional area (1131) form the boundary area (1133); the non-functional area (1131) also includes a second main flow channel (11314); the functional area (1132) also includes at least one A guide channel (11339) is provided, one end of which is connected to a portion of the branch channel (11321) and forms a second node (11332) at the connection position, and the other end of which is connected to the second main channel (11314) and forms a third node (11333) at the connection position; the second node (11332) is distributed in the second channel area (11323), and the third node (11333) is distributed in the boundary area (1133).

14. The battery device (1100) as claimed in claim 13, characterized in that, The cross-sectional areas of the first main flow channel (11313), the second main flow channel (11314), the branch flow channel (11321), and the guide flow channel (11339) are all the same.

15. The battery device (1100) according to any one of claims 1-5, characterized in that, The refrigerant heat exchange component (1130) has a first surface (1135) and a second surface opposite to each other, the first surface (1135) being disposed opposite to the battery cell assembly (1110); the refrigerant heat exchange component (1130) includes a plurality of mounting holes (1139), the plurality of mounting holes (1139) being disposed through between the first surface (1135) and the second surface and avoiding the first main flow channel (11313) and the branch flow channel (11321).

16. The battery device (1100) as claimed in claim 15, characterized in that, Along the first direction (X), a plurality of mounting holes (1139) are arranged in the central region of the refrigerant heat exchange component (1130) and spaced apart along the second direction (Y); and / or, along the second direction (Y), a plurality of mounting holes (1139) are arranged in the central region of the refrigerant heat exchange component (1130) and spaced apart along the first direction (X).

17. The battery device (1100) according to any one of claims 1-5, characterized in that, The refrigerant heat exchange component (1130) also has multiple cavities (1138) inside, each of which is configured to avoid the first main flow channel (11313) and the branch flow channel (11321).

18. A refrigerant heat exchange device, characterized in that, The refrigerant heat exchange device includes the refrigerant heat exchange component (1130) in the battery device (1100) as described in any one of claims 1-17.

19. An electrical appliance, characterized in that, Includes a battery device (1100) as described in any one of claims 1-17, the battery device (1100) being used to store or provide electrical energy.

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