Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device. The battery device comprises a box body; a battery cell assembly accommodated in the case; the heat exchange assembly is contained in the box body; the heat exchange main body comprises a plurality of heat exchange runners extending in the first direction; the flow collecting structures are arranged at the two ends of the heat exchange main body, each flow collecting structure comprises a plugging piece, a flow collecting piece and an adapter piece, the plugging pieces are plugged in the at least one heat exchange flow channel, the adapter pieces are formed in the heat exchange main body, notches are formed in the peripheral walls of the adapter pieces and correspond to the plugging pieces, and the flow collecting pieces are provided with flow collecting cavities; the flow collecting piece is in sealing fit with and connected with the heat exchange body through the adapting piece, and the flow collecting piece is provided with a communicating opening communicating with the flow collecting cavity. According to the utility model, the installation difficulty among the heat exchange main body, the current collecting piece and the adapter piece can be reduced, the connection reliability can be improved, the size of the plugging piece can be reduced, and the risk that the local surface pressure is relatively large when the battery monomers are expanded can be reduced, so that the reliability of the battery device can be improved.

Description

[0001] Cross-reference to related applications

[0002] This application is based on and claims priority to Chinese patent applications No. 202410501046.5, filed on April 24, 2024, and No. 202420869133.1, filed on April 24, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Technology

[0004] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, the battery pack, as the power source, plays an irreplaceable and crucial role. A battery pack consists of a casing and multiple battery cells housed within it. During continuous charging and discharging, the battery cells generate a significant amount of heat. Heat exchange components are typically installed inside the battery pack to regulate its internal temperature. However, the reliability of these heat exchange components greatly affects the overall reliability of the battery pack. Therefore, improving the reliability of battery packs has become one of the most pressing issues to be addressed. Utility Model Content

[0005] This application provides a battery device and an electrical device that can effectively improve the reliability of heat exchange components, thereby improving the reliability of the battery device and the electrical device.

[0006] In a first aspect, embodiments of this application provide a battery device, comprising: a housing; a battery cell assembly housed within the housing; and a heat exchange assembly housed within the housing for heat exchange with the battery cell assembly. The heat exchange assembly includes: a heat exchange body comprising a plurality of heat exchange channels extending along a first direction; and a flow collection structure disposed at both ends of the heat exchange body in the first direction. The flow collection structure includes a sealing element, a flow collector, and a connecting element. The sealing element seals within at least one heat exchange channel. The connecting element is formed in the heat exchange body, and its peripheral wall has a notch corresponding to the sealing element. The flow collector has a flow collection cavity. The flow collector is sealed and connected to the heat exchange body via the connecting element, thereby connecting the flow collection cavity and the heat exchange channels. The flow collector has a connecting port connecting to the flow collection cavity, which can be used for the inlet and outlet of the heat exchange medium.

[0007] In the above technical solution, by configuring the heat exchange assembly to include a heat exchange body and a current collection structure, and the current collection structure including a sealing component, a current collector, and a connecting component, when the heat exchange body is connected to the current collection structure, the connecting component is formed on the heat exchange body and then connected to the current collector. This prevents the current collector from being directly connected to the heat exchange body. The connecting component can easily adapt to the size and shape of the heat exchange body during the forming process, and can also easily match the size and shape of the current collector. This reduces the installation difficulty between the heat exchange body, current collector, and connecting component, improves connection reliability, reduces the risk of leakage, and improves the reliability of the battery device. During the forming of the connecting component on the heat exchange body, the notch allows for a larger clamping section length between the sealing component and the external pressure block, which helps reduce the size of the sealing component in the first direction. This reduces the risk of interference between the sealing component and the battery cell, and also reduces the risk of large local surface pressure between the battery cell and the heat exchange body during expansion, improving the reliability of the battery cell and further enhancing the reliability of the battery device.

[0008] In some embodiments of this application, the heat exchange body has a heat exchange surface that exchanges heat with the battery cell assembly, and the size of the overlapping area of ​​the orthographic projection of the sealing member on the heat exchange surface and the orthographic projection of the battery cell assembly on the heat exchange surface in a first direction is less than or equal to 10 mm.

[0009] In the above technical solution, since the expansion of a battery cell in a battery cell assembly usually starts from the center and spreads outwards, the size of the sealing component extending to one side of the battery cell assembly is relatively small. This helps to further reduce the risk of the sealing component interfering with the battery cell assembly and further reduce the probability of large local surface pressure when the battery cell expands, thereby improving the reliability of the battery cell assembly.

[0010] In some embodiments of this application, the orthographic projection of the sealing element on the heat exchange surface and the orthographic projection of the battery cell assembly on the heat exchange surface do not intersect.

[0011] In the above technical solution, there is no overlapping area between the sealing component and the battery cell assembly, which further reduces the risk of large local surface pressure between the battery cell and the heat exchanger body during battery cell expansion, thus helping to improve the reliability of the battery device. Furthermore, this solution also helps to reduce the overall size of the heat exchange assembly in the first direction, improving the internal structural compactness of the battery device and increasing its energy density.

[0012] In some embodiments of this application, in the first direction, the size of the sealing element is L1, and the maximum size of the notch is L2, wherein 0.1≤L2 / L1≤1.

[0013] In the above technical solution, by setting the ratio of the maximum size L2 of the notch to the size L1 of the sealing component within the aforementioned range, the size of the notch can be reasonably controlled while ensuring that the sealing component effectively seals the heat exchange channel. A smaller ratio means a smaller notch, which reduces the risk of the notch being too large and affecting the structural strength of the adapter and the reliability of its connection with the heat exchanger. While a larger ratio results in a larger notch, it remains within a reasonable range, and the sealing component can be located inside the adapter, reducing its impact on the battery cells and lowering the probability of localized high surface pressure when the battery cells expand, thereby improving the reliability of the battery device.

[0014] In some embodiments of this application, 0.3 ≤ L2 / L1 ≤ 0.8. In this technical solution, setting the L2 / L1 ratio within the above range helps to further precisely define the dimensional relationship between the notch and the sealing element. Within this range, the length of the pressing section and the structural and functional integrity of the sealing element can be more accurately balanced. The sealing element and the external pressure block can have a larger pressing area, which is beneficial to enhancing the supporting role of the sealing element inside the heat exchanger body, improving the connection reliability between the adapter and the heat exchanger body, and thus improving the reliability of the heat exchange assembly.

[0015] In some embodiments of this application, in the first direction, the size of the adapter is L3, and the maximum size of the notch is L2, wherein 0.1≤L2 / L3≤0.8.

[0016] In the above technical solution, since the notch of the adapter is usually located at the narrowest point of the adapter, by setting the ratio of the maximum size L2 of the notch to the size L3 of the adapter within the above range, the adapter itself can have enough solid part to maintain a good sealing fit and connection strength with the heat exchange body and the current collector, reduce the risk of leakage of the heat exchange medium, improve the overall sealing performance of the heat exchange assembly, and improve the reliability of the heat exchange assembly, thereby improving the reliability of the battery device.

[0017] In some embodiments of this application, 0.6 ≤ L2 / L3 ≤ 0.8.

[0018] In the above technical solution, by setting L2 / L3 within the above range, the size of the notch on the adapter can be adjusted more precisely. This allows for a more detailed balance between the structural function and clearance requirements of the adapter according to the actual application scenario. It also enables the adapter to have high rigidity and strength while providing the required compression section length for the sealing component. This results in better connection reliability between the adapter and the heat exchanger body.

[0019] In some embodiments of this application, multiple heat exchange channels are arranged sequentially along a second direction, which is perpendicular to the first direction. In the second direction, the maximum size of the notch is less than or equal to the size of the sealing element.

[0020] In the above technical solution, the structure ensures that the maximum size of the notch in the second direction does not exceed the size of the sealing component. Thus, the notch can fully increase the pressing surface between the sealing component and the external pressure block, reducing the risk of weakening the rigidity and structural strength of the adapter due to the excessive size of the notch, which is beneficial to improving the structural reliability of the adapter.

[0021] In some embodiments of this application, in the second direction, the size of the sealing element is H1, and the maximum size of the notch is H2, wherein 0.1≤H2 / H1≤1.

[0022] In the above technical solution, by setting H2 / H1 within the above range, the size of the notch relative to the sealing component can be controlled within a reasonable range. Thus, during the process of forming the adapter into the heat exchanger body, on the one hand, the notch position provided by the notch can play a better clamping role for the sealing component and the external pressure block, ensuring the length of the clamping section. On the other hand, it can reduce the risk that the structural strength of the adapter will be affected by the excessive size of the notch, which is conducive to making the connection between the adapter and the heat exchanger body more reliable.

[0023] In some embodiments of this application, 0.6 ≤ H2 / H1 ≤ 1. In this technical solution, by setting H2 / H1 within the above range, the size of the notch on the sealing component can be adjusted more precisely. This allows for a more detailed balance of the structural function of the notch according to the actual application scenario. It enables the notch to provide the required clamping section length for the sealing component while giving the adapter high rigidity and strength, thereby ensuring better connection reliability between the adapter and the heat exchanger body.

[0024] In some embodiments of this application, the size of the adapter is smaller than the size of the sealing member in the first direction.

[0025] In the above technical solution, the structure allows part of the sealing component to be located within the adapter, while another part extends beyond it. During the forming of the adapter into the heat exchanger body, the portion of the sealing component extending beyond the adapter can support the external pressure block, and it facilitates the formation of a suitable clamping section length between the sealing component and the external pressure block. This reduces the difficulty of adapting the external pressure block and lowers costs. Furthermore, the larger size of the sealing component compared to the adapter increases the contact area between the sealing component and the inner wall of the heat exchange channel, improving the sealing effect of the sealing component on the heat exchange channel, reducing the risk of heat exchange medium leakage, and enhancing the reliability of the heat exchange assembly. This, in turn, improves the heat exchange effect on the battery cells and the overall reliability of the battery device. A smaller adapter also reduces the risk of entering between the battery cell assembly and the heat exchanger body, lowering the probability of overlap between the adapter and the battery cell assembly in the first direction. This also helps reduce the risk of excessive local surface pressure during battery cell assembly expansion.

[0026] In some embodiments of this application, in the first direction, the size of multiple notches is always equal along the second direction, or the size of multiple notches gradually decreases and / or gradually increases along the second direction, the second direction is perpendicular to the first direction, and multiple heat exchange channels are arranged sequentially along the second direction.

[0027] In the above technical solution, setting the notch into the above structure can provide more options and help meet different usage needs. For example, during the molding of the adapter, different material injection pressures result in different clamping forces of the external pressure block. Therefore, the shape of the notch can be adjusted as needed to adjust the size of the clamping surface between the external pressure block and the sealing component to meet the clamping requirements. At the same time, the size of the sealing component can be adaptively adjusted to take into account both the sealing effect and the sealing effect of the sealing component on the heat exchange channel, while also taking into account the overall energy density requirements of the battery device.

[0028] In some embodiments of this application, the notch is a rectangular notch. In this technical solution, by setting the notch to the above shape, the processing and manufacturing are relatively simple, which helps to reduce production costs. At the same time, the regular rectangular shape can also form a larger area of ​​notch size, which helps to increase the area of ​​the pressing surface formed between the sealing member and the external pressure block at the notch location. It also helps to reduce the size of the sealing member in the first direction, which helps to reduce the weight of the heat exchange component and improve the volumetric energy density of the battery device.

[0029] In some embodiments of this application, the heat exchange body includes a shell and partitions. The shell is open at both ends in the first direction. The size of the shell in the second direction is larger than the size of the shell in the third direction. The third direction, the second direction and the first direction are perpendicular to each other. There are multiple partitions. The multiple partitions are disposed inside the shell and are spaced apart along the second direction to divide the interior of the shell into multiple heat exchange channels spaced apart in the second direction. The partitions are inclined relative to the third direction.

[0030] In the above technical solution, by configuring the heat exchanger body to include a shell and a partition, the heat exchanger body as a whole can form a thin shell structure, which has a high heat exchange efficiency while having a small volume, thus saving space inside the housing. The partition can also form diagonal ribs inside the shell, which can improve the overall strength of the heat exchanger body, reduce the risk of large deformation of the shell, improve the reliability of the heat exchanger body, and thus improve the reliability of the battery device.

[0031] In some embodiments of this application, the cross-sectional shape of the heat exchange channel and the cross-sectional shape of the sealing element are the same on a section plane perpendicular to the first direction.

[0032] In the above technical solution, by having the same cross-sectional shape for the heat exchange channel and the sealing component, the sealing component and the inner wall of the heat exchange channel can fit well together. This facilitates the sealing of the sealing component within the heat exchange channel, reduces the risk of gaps, and ensures that the sealing component can bear pressure evenly in all directions within the heat exchange channel. It also helps maintain a tight seal between the sealing component and the inner wall of the heat exchange channel. Because the heat exchange channel and the sealing component have the same cross-sectional shape, the sealing component also provides support within the heat exchange channel, reducing the risk of significant deformation of the heat exchange body under stress. This helps mitigate the risk of a reduction in the flow cross-section of the heat exchange channel, thereby improving the heat exchange reliability of the heat exchange body.

[0033] In some embodiments of this application, the adapter is injection molded onto the heat exchanger body.

[0034] In the above technical solution, the adapter is injection molded onto the heat exchanger body. This method allows for rapid molding, facilitating large-scale automated production and improving production efficiency. Furthermore, it ensures the adapter has high dimensional accuracy and surface quality, enhancing its molding quality and improving the connection reliability between the heat exchanger body, the adapter, and the current collector, thereby increasing the reliability of the battery device.

[0035] In some embodiments of this application, the heat exchanger body is made of metal or non-metal; and / or, the collector is made of metal or non-metal.

[0036] In this technical solution, using a metal heat exchanger body provides better thermal conductivity, which is beneficial for improving heat exchange efficiency. Alternatively, a non-metallic material can be used, allowing for cost reduction while still meeting thermal conductivity requirements. Using a metal manifold provides higher rigidity and strength, reducing the risk of damage; using a non-metallic manifold reduces costs while still meeting rigidity and strength requirements. By using these materials for both the heat exchanger body and the manifold, more options and greater flexibility are available.

[0037] Secondly, embodiments of this application also provide an electrical device, including a battery device as described above, the battery device being used to store or provide electrical energy.

[0038] In the above technical solution, since the battery device has high reliability, using the battery device to store or provide electrical energy can improve the reliability of power supply, thereby improving the reliability of the power supply device. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 The electrical device provided in some embodiments of this application is a structural schematic diagram of a vehicle;

[0041] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0042] Figure 3 This is a partial structural schematic diagram of a battery device provided in some embodiments of this application;

[0043] Figure 4 Schematic diagram of the three-dimensional structure of the heat exchange components provided in some embodiments of this application Figure 1 ;

[0044] Figure 5 A cross-sectional view of a partial structure of a heat exchange assembly provided in some embodiments of this application;

[0045] Figure 6 Explosion of partial structures of heat exchange components provided in some embodiments of this application Figure 1 ;

[0046] Figure 7 Explosion of partial structures of heat exchange components provided in some embodiments of this application Figure 2 ;

[0047] Figure 8 Schematic diagram of partial structure of heat exchange components provided in some embodiments of this application Figure 2 ;

[0048] Figure 9 This is an assembly diagram of the adapter and current collector provided in some embodiments of this application;

[0049] Figure 10 A partial structural schematic diagram of the adapter provided in some embodiments of this application;

[0050] Figure 11 This is a partial structural schematic diagram of a heat exchanger body provided in some embodiments of this application.

[0051] icon:

[0052] 1000. Electrical appliances;

[0053] 100. Battery device;

[0054] 10. Box body; 11. First box body; 12. Second box body;

[0055] 20. Battery cell assembly; 21. Battery cell;

[0056] 30. Heat exchange components;

[0057] 31. Heat exchanger body;

[0058] 301. Heat exchange flow channel;

[0059] 311, Shell; 311a, Curved wall;

[0060] 312. Partition;

[0061] 32. Current collection structure;

[0062] 321. Sealing components;

[0063] 322, manifold; 3221, manifold cavity; 322a, connecting port;

[0064] 323, Adapter; 323a, Notch;

[0065] 200, Controller; 300, Motor; X, First direction; Z, Second direction; Y, Third direction. Detailed Implementation

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

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

[0068] In this application, the reference to "embodiment" means that a 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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

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

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

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

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

[0073] In this application, the battery cell may include lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc., and the embodiments of this application are not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, and the embodiments of this application are not limited to these. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.

[0074] The battery apparatus mentioned in the embodiments of this application may refer to an assembly of one or more battery cells for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar. In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0075] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0076] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing. As an example, the individual battery cell assembly may be a battery module, which can be housed within the housing by securing the battery module to the housing. Alternatively, the individual battery cell assembly may be housed within the housing by directly securing multiple individual battery cells to the housing. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the individual battery cells.

[0077] A single battery cell includes a casing, electrode assembly, and electrolyte. The casing houses the electrode assembly and electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, while the uncoated positive current collector protrudes beyond the coated one, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the negative current collector without the negative active material layer protrudes from the one with the negative active material layer. The negative current collector without the negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0078] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0079] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, the battery pack, as the power source, plays an irreplaceable and crucial role. A battery pack consists of a casing and multiple battery cells housed within it. During continuous charging and discharging, the battery cells generate a significant amount of heat. Heat exchange components are typically installed inside the battery pack to regulate its internal temperature. However, the reliability of these heat exchange components greatly affects the overall reliability of the battery pack. Therefore, improving the reliability of battery packs has become one of the most pressing issues to be addressed.

[0080] In typical battery packs, a cold plate is usually installed inside the casing to exchange heat with the individual battery cells. The cold plate is connected to pipes for the inlet and outlet of the heat exchange medium via current collectors. The cold plate and current collectors are two independent components, both made of metal and welded together. However, controlling the dimensions and surface flatness of the cold plate is difficult, leading to poor fit between the cold plate and the current collector. This can affect the welding quality, increasing the risk of leakage between the cold plate and the current collector, impacting the heat exchange reliability of the cold plate. Furthermore, leaked heat exchange medium entering the casing can easily cause short circuits and other electrical safety hazards, thus affecting the overall reliability of the battery pack.

[0081] Based on the above considerations, in order to solve the problem that reliability issues of the heat exchange component during installation affect the reliability of the battery device, the applicant has designed a battery device, including: a housing, a battery cell assembly, and a heat exchange component; the battery cell assembly is housed in the housing; the heat exchange component is housed in the housing for heat exchange with the battery cell assembly; the heat exchange component includes a heat exchange body and a flow collection structure, the heat exchange body includes multiple heat exchange channels extending along a first direction; the flow collection structure is located at both ends of the heat exchange body in the first direction, and the flow collection structure includes a sealing element, a flow collector, and a connecting element, the sealing element sealing within at least one heat exchange channel, the connecting element being formed in the heat exchange body, the connecting element having a notch on its peripheral wall corresponding to the sealing element, the flow collector having a flow collection cavity, the flow collector being sealed and connected to the heat exchange body through the connecting element to connect the flow collection cavity and the heat exchange channels, the flow collector having a connecting port connecting to the flow collection cavity, the connecting port being used for the inlet and outlet of the heat exchange medium.

[0082] In the above technical solution, by configuring the heat exchange assembly to include a heat exchange body and a current collection structure, and the current collection structure including a sealing element, a current collector, and a connecting element, when the heat exchange body is connected to the current collection structure, the connecting element is formed on the heat exchange body and then connected to the current collector. This prevents the current collector from being directly connected to the heat exchange body. The connecting element can easily adapt to the size and shape of the heat exchange body during the forming process, and can also easily match the size and shape of the current collector. This reduces the installation difficulty between the heat exchange body, current collector, and connecting element, improves connection reliability, reduces the risk of leakage, and improves the reliability of the battery device. During the forming of the connecting element on the heat exchange body, the notch allows for a larger clamping section length between the sealing element and the external pressure block, which helps reduce the size of the sealing element in the first direction. This reduces the overlap area between the sealing element and the battery cell, reducing the risk of large local surface pressure between the battery cell and the heat exchange body during expansion, thus improving the reliability of the battery cell and further enhancing the reliability of the battery device.

[0083] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system comprising such an electrical device can be used, for example, an energy storage cabinet, an energy storage station, etc.

[0084] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0085] For ease of explanation, the following embodiments use a vehicle as an example to illustrate an electrical device 1000 according to an embodiment of this application. Please refer to... Figure 1 , Figure 1 The electrical device 1000 provided in some embodiments of this application is a structural schematic diagram of a vehicle. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle, and the battery device 100 can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle during starting, navigation, and driving.

[0086] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0087] Please refer to Figure 2 , Figure 2 This is an exploded view of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a plurality of battery cells 21, which are housed within the housing 10. The housing 10 provides assembly space for the battery cells 21, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cells 21. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12 so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12. Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as cylinder, cuboid, etc.

[0088] In the battery device 100, multiple battery cells 21 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 21 are connected in both series and parallel configurations. Multiple battery cells 21 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 21 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 21 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 21.

[0089] Please refer to Figure 2 , Figure 2 The following is an exploded view of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 may include multiple rows of battery cells 21, which are arranged along the length of the housing 10. Each row of battery cells 21 may include multiple battery cells 21 arranged along the width of the housing 10; or, multiple rows of battery cells 21 are arranged along the width of the housing 10, and each row of battery cells 21 may include multiple battery cells 21 arranged along the length of the housing 10.

[0090] Each battery cell 21 can be a secondary battery or a primary battery. A secondary battery refers to a battery cell 21 that can be recharged after discharge to activate the active materials and continue to be used. It can also be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment is not limited in this regard. The battery cell 21 can be cylindrical, flat, cuboid, or other shapes. For example, in... Figure 2 In the middle, the shape of the battery cell 21 is a cuboid.

[0091] According to some embodiments of this application, refer to Figures 3 to 9 This application provides a battery device 100, including: a housing 10, a battery cell assembly 20, and a heat exchange assembly 30.

[0092] The battery cell assembly 20 is housed within the housing 10. The heat exchange assembly 30 is housed within the housing 10 to exchange heat with the battery cell assembly 20. The heat exchange assembly 30 includes a heat exchange body 31 and a flow collection structure 32. The heat exchange body 31 includes a plurality of heat exchange channels 301 extending along a first direction X. The flow collection structure 32 is located at both ends of the heat exchange body 31 in the first direction X. The flow collection structure 32 includes a sealing member 321, a flow collection member 322, and a connecting member 323. The sealing member 321 seals at least one heat exchange channel 301. The connecting member 323 is formed in the heat exchange body 31. The peripheral wall of the connecting member 323 is provided with a notch 323a, which is correspondingly provided with the sealing member 321. The flow collection member 322 is provided with a flow collection cavity 3221. The flow collection member 322 is sealed and connected to the heat exchange body 31 through the connecting member 323 so that the flow collection cavity 3221 and the heat exchange channel 301 are connected. The flow collection member 322 is provided with a connecting port 322a that connects to the flow collection cavity 3221. The connecting port 322a can be used for the inlet and outlet of the heat exchange medium.

[0093] The enclosure 10 can refer to the external structure of the battery device 100, providing physical protection for electrical components such as the battery cell assembly 20 and heat exchange assembly 30 inside the battery device 100. The material of the enclosure 10 can include, but is not limited to, metal or composite materials. Metal materials can include, but are not limited to, aluminum alloy or steel, while composite materials can include, but are not limited to, carbon fiber reinforced composite materials, glass fiber reinforced composite materials, etc. The shape of the enclosure 10 can also include, but is not limited to, a cuboid, a cube, or a cylinder. For example, refer to... Figure 3 The box 10 is rectangular in shape.

[0094] Battery cell assembly 20 can refer to an assembly comprising one or more battery cells 21. When there are multiple battery cells 21, the multiple battery cells 21 can be connected in series, in parallel, or in a series-parallel configuration, etc., for example, see... Figure 3 The battery cell assembly 20 may include multiple rows of battery cells 21, with each row containing multiple battery cells 21.

[0095] The heat exchange assembly 30 can refer to a structure or component used to regulate the temperature of the battery cell assembly 20 and ensure the normal operation of the battery cell assembly 20. There can be one or more heat exchange assemblies 30, which can be disposed on the outermost battery cell 21 of the battery cell assembly 20, or between any two adjacent rows of battery cells 21 in a multi-row assembly. For example, refer to... Figure 3 The battery cell assembly 20 may include multiple rows of battery cells 21 arranged along the third direction Y. Each row of battery cells 21 may have multiple rows along the first direction X. Heat exchange assemblies 30 may be provided between any two adjacent rows of battery cells 21 and on the outer sides of the two rows of battery cells 21 at both ends of the second direction Z.

[0096] It should be noted that the first direction X, the third direction Y, and the second direction Z mentioned below can refer to one of the length, width, and height directions of the heat exchange body 31, without specific limitations. For example, the first direction X can refer to the length direction of the heat exchange body 31.

[0097] The heat exchanger body 31 can refer to a pipe-like component or a cavity structure capable of carrying a heat exchange medium. The heat exchange flow channel 301 can refer to a flow channel formed inside the heat exchanger body 31 for carrying a heat exchange medium, and can extend through the heat exchanger body 31 along the first direction X. The heat exchanger body 31 can be flat; for example, it can be a flat plate component or a structure composed of multiple heat exchange tubes connected side by side. The material of the heat exchanger body 31 can include, but is not limited to, metal materials, composite materials, or ceramic materials. Metal materials can include, but are not limited to, aluminum alloys, copper alloys, etc. Composite materials can include, but are not limited to, carbon fiber reinforced composite materials or graphite-metal composite materials, etc. Ceramic materials can include, but are not limited to, aluminum nitride ceramics or beryllium oxide ceramics, etc. The heat exchange medium mentioned in this application can include, but is not limited to, water, ethylene glycol aqueous solution, mineral oil, silicone oil, etc.

[0098] The flow collection structure 32 is provided at both ends of the heat exchange body 31 in the first direction X. It can refer to the flow collection structure 32 at both ends of the first direction X. One can be used to introduce the heat exchange medium and transport the heat exchange medium to the heat exchange channel 301 of the heat exchange body 31. The other can output the heat exchange medium after heat exchange from the heat exchange channel 301 to the external circulation pipeline.

[0099] The sealing component 321 refers to a part that can seal the heat exchange channel 301. For ease of understanding, the sealing component 321 can refer to a plug or blockage, which is partially or completely embedded in the heat exchange channel 301 to seal it. There can be one or more sealing components 321. A certain number of sealing components 321 can be selected as needed to seal a corresponding number of heat exchange channels 301. The material of the sealing component 321 can be, but is not limited to, wood, rubber, or plastic. It is understood that by setting the sealing component 321, the heat exchange channel 301 can be sealed, thereby adjusting the flow rate of the heat exchange medium flowing through the heat exchange body 31, and thus regulating the heat exchange capacity of the heat exchange assembly 30. For example, if the number of blocked heat exchange channels 301 in the heat exchange body 31 is greater, the amount of heat exchange medium flowing through it will be less, and the overall heat exchange capacity of the heat exchange component 30 will be weakened; if the number of blocked heat exchange channels 301 in the heat exchange body 31 is less, the amount of heat exchange medium flowing through it will be more, and the overall heat exchange capacity of the heat exchange component 30 will be improved.

[0100] The manifold 322 can refer to the main structure of the manifold structure 32, which is used to receive the heat exchange medium and collect the heat exchange medium together. For example, the manifold 322 can be a collector, and the manifold cavity 3221 refers to the cavity structure formed on the manifold 322. Optionally, the manifold cavity 3221 can be a cavity open to one side of the heat exchange body 31, and the connecting port 322a can refer to the inlet and outlet for the heat exchange medium entering and exiting the manifold cavity 3221. The material of the manifold 322 can include, but is not limited to, metal, plastic, or composite materials. Metal materials can include, but are not limited to, aluminum alloys, copper alloys, etc. Plastic materials can include, but are not limited to, polyethylene or polypropylene, etc. Composite materials can include, but are not limited to, carbon fiber reinforced composite materials or graphite-metal composite materials, etc.

[0101] The adapter 323 can refer to a component used to connect the collector 322 and the heat exchanger body 31. The adapter 323 can be an annular structure arranged around the first direction X, with one end of the adapter 323 wrapped around the heat exchanger body 31 and the other end wrapped around the collector 322. The adapter 323 can also be a non-annular structure, as long as it can simultaneously connect the collector 322 and the heat exchanger body 31; no specific limitations are made here in the above technical solution. The material of the adapter 323 can include, but is not limited to, metal or plastic materials. Metal materials can include, but are not limited to, aluminum alloys, copper alloys, etc., and plastic materials can include, but are not limited to, polyethylene or polypropylene, etc.

[0102] "The adapter 323 is formed on the heat exchange body 31" can be understood as the adapter 323 being directly molded on the heat exchange body 31, thereby enabling the adapter 323 and the heat exchange body 31 to be tightly integrated into a single unit, forming an integral structure. The molding method of the adapter 323 on the heat exchange body 31 can include, but is not limited to, injection molding, casting, or 3D printing, etc., without specific limitations. The "materials" mentioned later can refer to the injection molding liquid, casting liquid, or printing consumables used in the molding of the adapter 323, etc.

[0103] Since the heat exchanger body 31 and the collector 322 are usually pre-manufactured components with fixed dimensions or shapes, direct connection between them would be difficult in terms of matching dimensions, shapes, and surface flatness, and could easily lead to poor fit, affecting connection quality. By molding the adapter 323 onto the heat exchanger body 31, the adapter 323 can be manufactured according to the existing dimensions and shape of the heat exchanger body 31. Manufacturing the adapter 323 is easier, and the molding die allows it to better adapt to the existing dimensions, shape, and surface flatness of the collector 322. This reduces the installation difficulty between the heat exchanger body 31 and the collector 322. Connecting the heat exchanger body 31 to the collector 322 via the adapter 323 also ensures high connection quality, improving the reliability of the connection between the heat exchanger body 31, the adapter 323, and the collector 322.

[0104] The connection method between the adapter 323 and the collector 322 can include, but is not limited to, welding, bolting, or riveting, etc., and no specific restrictions are imposed here.

[0105] Based on the preceding text, taking injection molding and casting as examples, during the process of molding the adapter 323 onto the heat exchange body 31, a mold is generally set at the end of the heat exchange body 31 used for molding the adapter 323. A mold cavity corresponding to the adapter 323 is formed inside the mold. The adapter 323 is directly molded onto the heat exchange body 31 by injecting material into the mold cavity. However, due to the relatively high pressure during material injection, external pressure blocks are generally set at both ends of the mold to reduce the risk of overflow. For the side of the adapter 323 closest to the heat exchange body 31, the external pressure block is usually pressed tightly against the heat exchange body 31. Since part of the adapter 323 is located on the heat exchange body 31, to reduce the risk of deformation of the heat exchange body 31 caused by factors such as high pressure during material injection or the strong effect of the external pressure block, a mandrel or other supporting components need to be inserted into the heat exchange channel 301. However, since some heat exchange channels 301 have internal sealing components 321, which can provide support, a mandrel is not required. However, in order to ensure the sealing effect of the external pressure block on the mold end, the external pressure block and the sealing component 321 need to have a large pressing section length. This requires the sealing component 321 in the heat exchange channel 301 to have a certain length. However, if the length of the sealing component 321 is too long, it will cause the surface pressure to be large in some areas when the heat exchange body 31 is in contact with the surface of the battery cell 21, which will affect the reliability of the battery cell 21.

[0106] For the reasons mentioned above, a notch 323a is provided on the peripheral wall of the adapter 323 at the position corresponding to the sealing member 321. The notch 323a can refer to a notch structure formed by the inward contraction of the peripheral wall of the adapter 323 circumferentially arranged around the first direction X (see...). Figure 6 , Figure 8 and Figure 9 The adapter 323 with this structure can be adapted to have a notch of the same shape in the mold for forming the adapter 323. Correspondingly, the outer pressure block has a protruding structure with the same shape as the notch and is pressed against the end of the mold. Thus, the outer pressure block can press the sealing member 321 closer to the inside of the adapter 323. This can reduce the size of the sealing member 321 in the first direction X while ensuring that the length of the pressing section between the outer pressure block and the sealing member 321 meets the requirements.

[0107] When a battery cell 21 expands, it typically bulges from the center outwards, with less likelihood of bulging at the edges. By making the sealing element 321 smaller in the first direction X, the probability of it entering the space between the battery cell 21 and the heat exchanger body 31 when they are in contact is reduced. This means the risk of overlapping areas between the sealing element 321 and the battery cell 21 is also lower. Even if the sealing element 321 does enter the space between the battery cell 21 and the heat exchanger body 31, its size within this space is small, and its distance from the center of the battery cell 21 is greater. Therefore, the probability of interaction between the battery cell 21 and the sealing element 321 when the battery cell 21 expands is low, thus reducing the risk of excessive local surface pressure during expansion and improving the reliability of the battery cell 21.

[0108] For example, in the battery device 100 with the above structure, the sealing member 321 of the heat exchange component 30 can be 5mm to 10mm in size in the first direction X, thus the size of the sealing member 321 is relatively small. When the heat exchange body 31 and the battery cell 21 are in contact, the overlapping area of ​​the sealing member 321 with the battery cell 21 is also relatively small. When the battery cell 21 expands, the effect of the sealing member 321 is relatively small, which can reduce the risk of large local surface pressure when the battery cell 21 expands.

[0109] In the above technical solution, by setting the heat exchange component 30 to include a heat exchange body 31 and a current collection structure 32, and the current collection structure 32 including a sealing component 321, a current collection component 322 and a connecting component 323, when the heat exchange body 31 is connected to the current collection structure 32, the connecting component 323 is formed on the heat exchange body 31 and then connected to the current collection component 322. This makes the current collection component 322 not directly connected to the heat exchange body 31. The connecting component 323 can easily adapt to the size and shape of the heat exchange body 31 during the forming process, and can pre-match the size and shape of the current collection component 322. This reduces the installation difficulty between the heat exchange body 31, the current collection component 322 and the connecting component 323, improves the connection reliability, reduces the risk of leakage, and improves the reliability of the battery device 100. During the process of forming the adapter 323 into the heat exchange body 31, the notch 323a can provide a larger clamping section length between the sealing member 321 and the external pressure block. This helps to reduce the size of the sealing member 321 in the heat exchange channel 301, thereby reducing the risk of large local surface pressure between the battery cell 21 and the heat exchange body 31 when the battery cell 21 expands due to the sealing member 321 in the heat exchange channel 301. This can improve the reliability of the battery cell 21, thereby further improving the reliability of the battery device 100.

[0110] In some embodiments of this application, reference is made to Figure 4 The heat exchange body 31 has a heat exchange surface 31a that exchanges heat with the battery cell assembly 20. The size of the overlapping area of ​​the orthographic projection of the sealing member 31 on the heat exchange surface 31a and the orthographic projection of the battery cell assembly 20 on the heat exchange surface 31a in the first direction X is less than or equal to 10 mm.

[0111] Reference Figure 4 The heat exchange surface 31a can refer to the surface of the heat exchange body 31 that is in contact with or close to the battery cell 21 for heat exchange.

[0112] The dimensions of the overlapping area of ​​the orthographic projection of the sealing element 31 on the heat exchange surface 31a and the orthographic projection of the battery cell assembly 20 on the heat exchange surface 31a in the first direction X can be, but are not limited to, 10mm, 9mm, 8mm, 7mm, 6mm, 5mm, 4mm, 3mm, 2mm, 1mm, 0mm, etc.

[0113] In the above technical solution, since the battery cell 21 in the battery cell assembly 20 usually expands from the middle to the surrounding area when it expands, the size of the sealing member 321 extending to one side of the battery cell assembly 20 is relatively small. This helps to further reduce the risk of the sealing member 321 interfering with the battery cell assembly 20, and further reduce the probability of large local surface pressure when the battery cell 21 expands, thereby improving the reliability of the battery cell assembly 20.

[0114] In some embodiments of this application, the orthographic projection of the sealing member 321 on the heat exchange surface 31a and the orthographic projection of the battery cell assembly 20 on the heat exchange surface 31a do not intersect.

[0115] The statement that "the orthographic projection of the sealing element 321 on the heat exchange surface 31a and the orthographic projection of the battery cell assembly 20 on the heat exchange surface 31a do not intersect" can mean that there is no overlap between the orthographic projections of the sealing element 321 on the heat exchange surface 31a and the orthographic projections of the battery cell assembly 20 on the heat exchange surface 31a. When the battery cell 21 near the current collector structure 32 expands, since the battery cell 21 is not subjected to the relatively rigid sealing element 321, the expansion surface of the battery cell 21 experiences relatively uniform stress, which can further reduce the risk of large local surface pressure when the battery cell 21 expands.

[0116] Secondly, as mentioned above, since the peripheral wall of the adapter 323 has a notch 323a at the position corresponding to the sealing member 321, the size of the sealing member 321 in the first direction X can be made relatively small, thereby meeting the requirements of the adapter 323 being formed in the heat exchange body 31. On this basis, since the orthographic projection of the sealing member 321 on the heat exchange surface 31a and the orthographic projection of the battery cell assembly 20 on the heat exchange surface 31a do not coincide, while ensuring that the risk of a large local surface pressure between the battery cell 21 and the heat exchange body 31 when it expands is very small, the overall size of the heat exchange assembly 30 in the first direction X can be relatively small, and the structure is more compact.

[0117] In the above technical solution, the structure described above can further reduce the probability of overlapping areas between the sealing component 321 and the battery cell assembly 20, thereby further reducing the risk of large local surface pressure between the battery cell 21 and the heat exchange body 31 when the battery cell 21 expands, which helps to improve the reliability of the battery device 100. Moreover, the above solution also helps to reduce the overall size of the heat exchange assembly 30 in the first direction X, improve the internal structural compactness of the battery device 100, and increase the energy density of the battery device 100.

[0118] In some embodiments of this application, reference is made to Figure 7 In the first direction X, the size of the sealing element 321 is L1, and the maximum size of the notch 323a is L2, where 0.1≤L2 / L1≤1.

[0119] It is understandable that, in the direction extending along the second direction Z, the size L2 of the notch 323a can always be equal (e.g., the notch 323a is a rectangular notch), and the size of the notch 323a at any position in the second direction Z in the first direction X is L2; ​​the size L2 of the notch 323a can also gradually change (e.g., the notch 323a is an arc-shaped notch), and the size of the notch 323a at only some positions in the second direction Z in the first direction X is L2.

[0120] L2 / L1 can include, but is not limited to, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc. When L2 / L1 is 0.1, it can refer to the minimum value at which the sealing component 321 can effectively reduce the risk of excessive local surface pressure when the battery cell 21 expands, provided that the length of the pressing section between the external pressure block and the sealing component 321 meets the requirements. When L2 / L1 is 1, the sealing component 321 is entirely located inside the adapter 323. Therefore, when the heat exchange assembly 30 and the battery cell 21 are in contact with each other, the sealing component 321 has no interference effect on the battery cell 21, and the effect of reducing the risk of excessive local surface pressure when the battery cell 21 expands is also better.

[0121] In the above technical solution, by setting the ratio of the maximum size L2 of the notch 323a to the size L1 of the sealing member 321 within the aforementioned range, the size of the notch 323a can be reasonably controlled while the sealing member 321 effectively seals the heat exchange channel 301. A smaller ratio means a smaller notch 323a, which reduces the risk of the notch 323a being too large, affecting the structural strength of the adapter 323 and the reliability of its connection with the heat exchange body 31. A larger ratio, while making the size of the notch 323a relatively large, is still within a reasonable range, and the sealing member 321 can be located inside the adapter 323, reducing the impact of the sealing member 321 on the battery cell 21 and lowering the probability of large local surface pressure when the battery cell 21 expands, thereby improving the reliability of the battery device 100.

[0122] In some embodiments of this application, 0.3 ≤ L2 / L1 ≤ 0.8.

[0123] In the above technical solution, setting the L2 / L1 ratio within the aforementioned range helps to further precisely define the dimensional relationship between the notch 323a and the sealing element 321. Within this range, the length of the pressing section and the structural and functional integrity of the sealing element 321 can be more accurately balanced. The sealing element 321 and the external pressure block can have a larger pressing area, which is beneficial to enhancing the supporting role of the sealing element 321 inside the heat exchange body 31, improving the connection reliability between the adapter 323 and the heat exchange body 31, and thus improving the reliability of the heat exchange assembly 30.

[0124] In some embodiments of this application, reference is made to Figure 7 In the first direction X, the size of the adapter 323 is L3, and the maximum size of the notch 323a is L2, where 0.1≤L2 / L3≤0.8.

[0125] L2 / L3 can include, but are not limited to, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, etc.

[0126] When L2 / L3 is 0.1, a notch 323a of suitable size can be formed on the adapter 323. This can significantly reduce the probability of large local surface pressure when the battery cell 21 expands, provided that the length of the clamping section between the sealing member 321 and the external pressure block meets the requirements.

[0127] When L2 / L3 is 0.8, the size reduction of the sealing component 321 is better while ensuring that the length of the clamping section between the sealing component 321 and the external pressure block meets the requirements. At the same time, since the notch 323a of the adapter 323 is usually located at the narrowest position of the adapter 323, the above ratio can also make the narrowest position of the adapter 323 have an appropriate thickness. On the one hand, it can make the narrowest position have high rigidity and strength, and on the other hand, it can also make the adapter 323 have a better covering effect on the heat exchange body 31 and the collector 322, thereby improving the connection reliability of the adapter 323, the heat exchange body 31 and the collector 322.

[0128] In the above technical solution, by setting the ratio of the maximum size L2 of the notch 323a to the size L3 of the adapter 323 within the above range, the adapter 323 itself has enough solid part to maintain a good sealing fit and connection strength with the heat exchange body 31 and the current collector 322, reducing the risk of leakage of the heat exchange medium, improving the overall sealing performance of the heat exchange assembly 30, which is conducive to improving the reliability of the heat exchange assembly 30, and thus improving the reliability of the battery device 100.

[0129] In some embodiments of this application, 0.6 ≤ L2 / L3 ≤ 0.8.

[0130] In the above technical solution, by setting L2 / L3 within the above range, the size of the notch 323a on the adapter 323 can be adjusted more precisely. This allows for a more detailed balance between the structural function and clearance requirements of the adapter 323 according to the actual application scenario. Based on the notch 323a providing the required clamping section length for the sealing component 321, the adapter 323 can have higher rigidity and strength, thereby ensuring better connection reliability between the adapter 323 and the heat exchange body 31.

[0131] In some embodiments of this application, reference is made to Figure 5 and Figure 7 Multiple heat exchange channels 301 are arranged sequentially along the second direction Z, which is perpendicular to the first direction X. In the second direction Z, the maximum size of the notch 323a is less than or equal to the size of the sealing member 321.

[0132] Referring to the previous text, in the second direction Z, the shape of the notch 323a can be a shape of equal width, such as a rectangular notch, or the shape of the notch 323a can be a shape of non-equal width, such as an arc notch. Therefore, the maximum size of the notch 323a can refer to the size of the position of the maximum width of the notch 323a in the second direction Z.

[0133] In the above technical solution, the structure ensures that the maximum size of the notch 323a in the second direction Z does not exceed the size of the sealing member 321. Thus, the notch 323a can fully increase the pressing surface between the sealing member 321 and the external pressure block, reducing the risk of weakening the rigidity and structural strength of the adapter 323 due to the excessive size of the notch 323a, which is beneficial to improving the structural reliability of the adapter 323.

[0134] In some embodiments of this application, reference is made to Figure 7 In the second direction Z, the size of the sealing element 321 is H1, and the maximum size of the notch 323a is H2, where 0.1≤H2 / H1≤1.

[0135] H2 / H1 can be, but is not limited to, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc.

[0136] When H2 / H1 is 0.1, this is the minimum ratio at which the notch 323a can increase the length of the clamping section between the sealing element 321 and the external pressure block. If the ratio is less than this, the notch position provided by the notch 323a will prevent the sealing element 321 and the external pressure block from forming an effective clamping effect, and will have little effect on reducing the length of the sealing element 321.

[0137] When H2 / H1 is 0.8, this is the maximum ratio at which the notch 323a can increase the length of the clamping section between the sealing element 321 and the external pressure block. If the notch 323a exceeds the notch position of the sealing element 321, it will not contribute to improving the clamping effect between the sealing element 321 and the external pressure block. Instead, it will reduce the solid structure of the adapter 323, weaken the rigidity and strength of the adapter 323, and be detrimental to the connection reliability and connection strength between the adapter 323 and the heat exchange body 31.

[0138] In the above technical solution, by setting H2 / H1 within the above range, the size of the notch 323a relative to the sealing member 321 can be controlled within a reasonable range. Thus, during the process of the adapter 323 being formed in the heat exchange body 31, on the one hand, the notch position provided by the notch 323a can play a better clamping role for the sealing member 321 and the external pressure block, ensuring the length of the clamping section. On the other hand, it can reduce the risk that the size of the notch 323a is too large and affects the structural strength of the adapter 323, which is conducive to having a high connection reliability between the adapter 323 and the heat exchange body 31.

[0139] In some embodiments of this application, 0.6 ≤ H2 / H1 ≤ 1.

[0140] In the above technical solution, by setting H2 / H1 within the above range, the size of the notch 323a on the sealing member 321 can be adjusted more precisely. This allows for a more detailed balance of the structural function of the notch 323a according to the actual application scenario. It enables the notch 323a to provide the required compression section length for the sealing member 321, while also giving the adapter 323 high rigidity and strength, thereby ensuring a better connection reliability between the adapter 323 and the heat exchange body 31.

[0141] In some embodiments of this application, in the first direction X, the size of the adapter 323 is less than or equal to the size of the sealing member 321. (Refer to...) Figure 7 In other words, the size L3 of the adapter 323 is smaller than the size L1 of the sealing component 321.

[0142] In the above technical solution, the structure allows part of the sealing element 321 to be located within the adapter 323, while another part extends beyond the adapter 323. During the forming of the adapter 323 into the heat exchange body 31, the portion of the sealing element 321 extending beyond the adapter 323 can support the external pressure block, and the required clamping section length can be easily formed between the sealing element 321 and the external pressure block. This reduces the difficulty of adapting the external pressure block and lowers costs. Furthermore, the larger size of the sealing element 321 compared to the adapter 323 increases the contact area between the sealing element 321 and the inner wall of the heat exchange channel 301, improving the sealing and plugging effect of the sealing element 321 on the heat exchange channel 301, reducing the risk of heat exchange medium leakage, improving the reliability of the heat exchange assembly 30, and consequently improving the heat exchange effect on the battery cell 21 and the overall reliability of the battery device 100.

[0143] In the above technical solution, the smaller adapter 323 can also reduce the risk of entering between the battery cell assembly 20 and the heat exchange body 31, and reduce the probability that the adapter 323 and the battery cell assembly 20 have an overlapping area in the first direction X. This also helps to reduce the risk of large local surface pressure when the battery cell assembly 20 expands.

[0144] In some embodiments of this application, reference is made to Figure 9 and Figure 10 In the first direction X, the size of the multiple notches 323a is always equal along the second direction Z, or the size of the multiple notches 323a gradually decreases and / or gradually increases along the second direction Z. The second direction Z is perpendicular to the first direction X, and the multiple heat exchange channels 301 are arranged sequentially along the second direction Z.

[0145] Reference Figure 9 and Figure 10 (a) The notch 323a can be rectangular. In this case, the size of the notch 323a is always equal along the second direction Z in the first direction X.

[0146] "The size of the notch 323a gradually decreases and / or gradually increases along the second direction Z" can mean that the size of the notch 323a gradually decreases along the second direction Z, or that the size of the notch 323a gradually increases along the second direction Z, or that the size of the notch 323a gradually decreases and then gradually increases along the second direction Z. (Refer to...) Figure 10 (b) The notch 323a can be arc-shaped. In this case, the size of the notch 323a can gradually decrease along the second direction Z in the first direction X.

[0147] In the above technical solution, setting the notch 323a into the above structure can provide more options and is conducive to meeting different usage requirements. For example, during the molding of the adapter 323, different material injection pressures result in different clamping forces of the external pressure block. Therefore, the shape of the notch 323a can be adjusted as needed to adjust the size of the clamping surface between the external pressure block and the sealing member 321 to meet the clamping requirements. At the same time, the size of the sealing member 321 can also be adjusted adaptively to take into account the sealing effect of the sealing member 321 on the heat exchange channel 301, and at the same time, it can also take into account the overall energy density requirements of the battery device 100.

[0148] In some embodiments of this application, reference is made to Figure 9 and Figure 10 The notch 323a is a rectangular notch.

[0149] In the above technical solution, by setting the notch 323a to the above shape, the processing and manufacturing are relatively simple, which is conducive to reducing production costs. At the same time, the regular rectangular shape can also form a larger area of ​​notch size, which is conducive to increasing the area of ​​the pressing surface formed between the sealing member 321 at the location of the notch 323a and the external pressure block. It is also conducive to reducing the size of the sealing member 321 in the first direction X, which is conducive to reducing the weight of the heat exchange component 30 and improving the volumetric energy density of the battery device 100.

[0150] In some embodiments of this application, reference is made to Figure 11 The heat exchange body 31 includes a shell 311 and partitions 312. The shell 311 is open at both ends in the first direction X. The size of the shell 311 in the second direction Z is larger than the size of the shell 311 in the third direction Y. The third direction Y, the second direction Z and the first direction X are perpendicular to each other. There are multiple partitions 312. Multiple partitions 312 are disposed inside the shell 311 and are spaced apart along the second direction Z to divide the interior of the shell 311 into multiple heat exchange channels 301 spaced apart in the second direction Z. The partitions 312 are inclined relative to the third direction Y.

[0151] The partition 312 can be a thin plate that serves as a divider inside the housing 311. Optionally, in the first direction X, the size of the partition 312 can be equal to the size of the housing 311, and the two ends of the partition 312 in the third direction Y can be connected to the inner wall of the heat exchange channel 301.

[0152] "The dimension of the shell 311 in the second direction Z is greater than the dimension of the shell 311 in the second direction Y". Therefore, the cross section of the shell 311 perpendicular to the first direction X is rectangular. Optionally, the rectangle can be constructed as a long strip. This allows the shell 311 to form a thinner shell structure, which can save space.

[0153] "The partition 312 is inclined relative to the third party in the Y direction" can be understood as the partition 312 not only separates the internal space of the shell 311 to form the heat exchange channel 301, but also acts as a rib to improve the overall structural strength and rigidity of the heat exchange body 31.

[0154] The heat exchange body 31, consisting of the shell 311 and multiple baffles 312, can form a "harmonica tube" structure, which is simple in structure and easy to manufacture. The shell 311 and multiple baffles 312 can be integrally formed or separately arranged; no specific restrictions are imposed here.

[0155] In the above technical solution, by configuring the heat exchange body 31 to include a shell 311 and a partition 312, the heat exchange body 31 can form a thin shell structure, which has a high heat exchange efficiency while having a small volume, saving space inside the housing 10. The partition 312 can also form diagonal ribs inside the shell 311, which can improve the overall strength of the heat exchange body 31, reduce the risk of large deformation of the shell 311, improve the reliability of the heat exchange body 31, and thus improve the reliability of the battery device 100.

[0156] In some embodiments of this application, the housing 311 and the partition 312 are integrally formed. This integral forming method reduces the number of parts and assembly steps, thereby improving production efficiency. Furthermore, this solution enhances the overall strength and rigidity of the heat exchange body 31, reducing the risk of significant deformation or damage, thus improving the reliability of the heat exchange body 31 and consequently the reliability of the heat exchange assembly 30, ultimately enhancing the reliability of the battery device 100.

[0157] In some embodiments of this application, reference is made to Figure 11 The shell walls at both ends of the shell 311 in the second direction Z are configured as arc-shaped walls 311a. In this technical solution, the arc-shaped walls 311a can reduce the stress concentration problem at both ends of the shell 311 in the third direction Z, thereby improving the reliability of the shell 311.

[0158] In some embodiments of this application, the cross-sectional shape of the heat exchange channel 301 and the cross-sectional shape of the sealing member 321 are the same on a section plane perpendicular to the first direction X.

[0159] For example, refer to Figure 11 On a cutting plane perpendicular to the first direction X, the cross-sectional shape of the heat exchange channel 301 can be rhomboid, and thus the cross-sectional shape of the sealing member 321 can also be rhomboid.

[0160] In the above technical solution, by having the same cross-sectional shape for the heat exchange channel 301 and the sealing element 321, the sealing element 321 and the inner wall of the heat exchange channel 301 can fit well together. This facilitates the sealing of the sealing element 321 within the heat exchange channel 301, reduces the risk of gaps, and ensures that the sealing element 321 can bear pressure evenly in all directions within the heat exchange channel 301. It also helps maintain a sealed state between the sealing element 321 and the inner wall of the heat exchange channel 301. Because the heat exchange channel 301 and the sealing element 321 have the same cross-sectional shape, the sealing element 321 can also provide support inside the heat exchange channel 301, reducing the risk of large deformation of the heat exchange body 31 under stress. This helps reduce the risk of a reduction in the flow cross-section of the heat exchange channel 301, thereby improving the heat exchange reliability of the heat exchange body 31.

[0161] In some embodiments of this application, the adapter 323 is injection molded onto the heat exchange body 31.

[0162] It is understandable that the adapter 323 can be manufactured by injection molding of the heat exchange body 31. Injection molding here can be, but is not limited to, overmolding injection molding, etc. For example, a mandrel can be inserted into the heat exchange channel 301 of the heat exchange body 31 that does not need to be sealed beforehand. Then, molds for injection molding the adapter 323 can be set at both ends of the heat exchange body 31 in the first direction X. By injecting injection plastic into the mold and cooling it, the adapter 323 can be obtained. The adapter 323 formed in this way has a tighter and stronger connection with the heat exchange body 31 and is less likely to detach.

[0163] The adapter 323 can be made of plastic, and the current collector 322 can also be made of plastic. After molding, the adapter 323 can be fixed together with the current collector 322 by welding through hot melting of the plastic material.

[0164] The adapter 323 can also be partially made of plastic and partially made of metal, while the current collector 322 is made of metal. For example, the metal part of the adapter 323 can be pre-placed in a mold, the plastic part of the adapter 323 can be injection molded, and after the adapter 323 is formed, the metal part can be connected to the current collector 322 by welding.

[0165] In the above technical solution, the adapter 323 is injection molded onto the heat exchange body 31. The molding speed of the adapter 323 is relatively fast, which is easy for mass automated production and can improve production efficiency. This method can also give the adapter 323 high dimensional accuracy and high surface quality, which can improve the molding quality of the adapter 323, improve the connection reliability between the heat exchange body 31, the adapter 323 and the current collector 322, and thus improve the reliability of the battery device 100.

[0166] In some embodiments of this application, the heat exchange body 31 is made of metal or non-metal; and / or, the collector 322 is made of metal or non-metal.

[0167] It is understood that the heat exchanger body 31 can be made of metal or non-metal; the manifold 322 can also be made of metal or non-metal. Metal materials can include, but are not limited to, copper, copper alloys, aluminum alloys, etc., while non-metal materials can include, but are not limited to, plastics, ceramics, etc. The heat exchanger body 31 and the manifold 322 can be made of the same material or different materials.

[0168] Especially when the heat exchanger body 31 and the collector 322 are made of different materials, for example, the heat exchanger body 31 is made of metal and the collector 322 is made of non-metal; or, the heat exchanger body 31 is made of non-metal and the collector 322 is made of metal, the adapter 323 is injection molded onto the heat exchanger body 31 and the collector 322. This facilitates the connection between the heat exchanger body 31 and the collector 322 made of different materials, reduces the installation difficulty of the heat exchanger body 31 and the collector 322, and improves the reliability of the connection between the heat exchanger body 31 and the collector 322.

[0169] In this technical solution, the heat exchanger body 31, being made of metal, offers better thermal conductivity, which is beneficial for improving heat exchange efficiency. Alternatively, the heat exchanger body 31 can be made of non-metallic material, which helps reduce costs while still meeting thermal conductivity requirements. The current collector 322, being made of metal, provides higher rigidity and strength, reducing the risk of damage. Conversely, a non-metallic current collector 322 can reduce costs while still meeting rigidity and strength requirements. By using the aforementioned materials for the heat exchanger body 31 and the current collector 322, more options and greater flexibility are available.

[0170] This application also provides an electrical device 1000, including a battery device 100 as described in any of the preceding embodiments, the battery device 100 being used to store or provide electrical energy.

[0171] In the above technical solution, since the battery device 100 has high reliability, using the battery device 100 to store or provide electrical energy can improve the reliability of power supply, thereby improving the reliability of the power supply device 1000.

[0172] Reference Figures 3 to 11 A battery device 100 provided according to an embodiment of this application includes: a housing 10, a battery cell assembly 20, and a heat exchange assembly 30.

[0173] The battery cell assembly 20 is housed within the housing 10. The heat exchange assembly 30 is housed within the housing 10 to exchange heat with the battery cell assembly 20. The heat exchange assembly 30 includes a heat exchange body 31 and a current collection structure 32.

[0174] The heat exchange body 31 is a harmonica tube cold plate and includes multiple heat exchange channels 301 extending along the first direction X. Multiple inclined ribs are provided inside the harmonica tube cold plate. Heat exchange channels 301 are formed between any two adjacent inclined ribs and between the inclined ribs and the inner wall of the harmonica tube cold plate.

[0175] The flow collection structure 32 is located at both ends of the heat exchange body 31 in the first direction X. The flow collection structure 32 includes a sealing element 321, a flow collector 322, and a connecting element 323. There are multiple sealing elements 321, which are respectively sealed in at least one heat exchange channel 301. The orthographic projections of the multiple sealing elements 321 on the heat exchange surface 31a of the heat exchange body 31 and the orthographic projections of the battery cell 21 on the heat exchange surface 31a do not intersect. The connecting element 323 is injection molded onto the heat exchange body 31 with rubber coating. The peripheral wall of the connecting element 323 is provided with a notch 323, which is correspondingly provided with the sealing element 321, and the notch 323a is rectangular in shape. The collector 322 is provided with a collector cavity 3221. The collector 322 is sealed and connected to the heat exchange body 31 through a connector 323. The collector 322 and the connector 323 are welded together so that the collector cavity 3221 and the heat exchange channel 301 are connected. The collector 322 is provided with a connecting port 322a that connects to the collector cavity 3221. The connecting port 322a can be used for the inlet and outlet of the heat exchange medium so that the heat exchange medium can flow between the collector cavity 3221 and the heat exchange channel 301.

[0176] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The above are merely preferred embodiments of this application and are not intended to limit the application. For those skilled in the art, unless otherwise specified, all implementation methods and optional implementation methods of this application can be combined to form new technical solutions. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery device, characterized by, The application relates to a battery pack, comprising: a box body; a battery cell assembly accommodated in the box body; a heat exchange assembly accommodated in the box body and in thermal exchange with the battery cell assembly, the heat exchange assembly comprising: a heat exchange main body comprising a plurality of heat exchange flow channels extending along a first direction; a flow collecting structure arranged at both ends of the heat exchange main body along the first direction, the flow collecting structure comprising a blocking piece, a flow collecting piece and an adapter piece, the blocking piece being arranged in at least one of the heat exchange flow channels, the adapter piece being formed on the heat exchange main body, a peripheral wall of the adapter piece being provided with a notch, the notch being arranged in correspondence with the blocking piece, the flow collecting piece being provided with a flow collecting cavity, the flow collecting piece being in sealing cooperation and connection with the heat exchange main body through the adapter piece, so that the flow collecting cavity and the heat exchange flow channels are in communication, the flow collecting piece being provided with a communication port communicating with the flow collecting cavity, the communication port being used for feeding and discharging heat exchange medium.

2. The battery device according to claim 1, characterized by The heat exchange main body has a heat exchange surface in thermal exchange with the battery cell assembly, the size of an overlapping area of a projection of the blocking piece on the heat exchange surface and a projection of the battery cell assembly on the heat exchange surface along the first direction is less than or equal to 10 mm.

3. The battery device of claim 2, wherein The projection of the blocking piece on the heat exchange surface and the projection of the battery cell assembly on the heat exchange surface do not overlap.

4. The battery device according to any one of claims 1 to 3, characterized by, In the first direction, the size of the blocking piece is L1, and the maximum size of the notch is L2, wherein 0.1<=L2 / L1<=1.

5. The battery device of claim 4, wherein, 0.3<=L2 / L1<=0.

8.

6. The battery device according to any one of claims 1 to 5, characterized by, In the first direction, the size of the adapter piece is L3, and the maximum size of the notch is L2, wherein 0.1<=L2 / L3<=0.

8.

7. The battery device of claim 6, wherein 0.6<=L2 / L3<=0.

8.

8. The battery device according to any one of claims 1 to 7, characterized by, A plurality of the heat exchange flow channels are arranged along a second direction in sequence, the second direction being perpendicular to the first direction, and in the second direction, the maximum size of the notch is less than or equal to the size of the blocking piece.

9. The battery device of claim 8, wherein, In the second direction, the size of the blocking piece is H1, and the maximum size of the notch is H2, wherein 0.1<=H2 / H1<=1.

10. The battery device of claim 9, wherein, 0.6<=H2 / H1<=1.

11. The battery device according to any one of claims 8 to 10, characterized by, In the first direction, the size of the adapter piece is less than the size of the blocking piece.

12. The battery device according to any one of claims 1 to 11, characterized by, In the first direction, the sizes of a plurality of the notches are always equal along a second direction, or the sizes of a plurality of the notches gradually decrease and / or gradually increase along the second direction, the second direction being perpendicular to the first direction, and a plurality of the heat exchange flow channels are arranged along the second direction in sequence.

13. The battery device according to any one of claims 1 to 11, characterized by, The notch is a rectangular notch.

14. The battery device according to any one of claims 1 to 13, characterized by, The heat exchange main body comprises a shell and a plurality of partitions, the shell being open at both ends along the first direction, the size of the shell along a second direction being greater than the size of the shell along a third direction, the third direction, the second direction and the first direction being perpendicular to each other, the plurality of partitions being arranged in the shell and spaced along the second direction, so as to divide the shell into a plurality of heat exchange flow channels spaced along the second direction, and the partitions are arranged obliquely relative to the third direction.

15. The battery device of claim 14, wherein, On a section plane perpendicular to the first direction, the cross-sectional shape of the heat exchange flow channel is the same as the cross-sectional shape of the blocking piece.

16. The battery device according to any one of claims 1 to 15, characterized by, The adapter is injection molded on the heat exchange main body.

17. The battery device of any one of claims 1 to 16, wherein, The heat exchange main body is a metal material piece or a non-metal material piece; and / or the current collecting piece is a metal material piece or a non-metal material piece.

18. An electrical device, comprising: A battery device as claimed in any one of claims 1 to 17 for storing or providing electrical energy.

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