Battery device and electric equipment

Abstract

The utility model relates to the technical field of battery heat exchange, and particularly discloses a battery device and electric equipment.The battery device comprises a battery monomer assembly and a heat exchanger, the heat exchanger exchanges heat with the battery monomer assembly, the heat exchanger comprises a heat exchange body, a switching part and a current collector, and a heat exchange channel is formed in the heat exchange body; at least one end part of the heat exchange body is opened to form an opening; the switching part is fixed to the end of the heat exchange body, and a first protruding welding protrusion is arranged on the end face, away from the heat exchange body, of the switching part. The current collector is provided with a current collecting opening, the current collector is fixed to the end of the switching part to seal the opening, the current collecting opening communicates with the heat exchange channel, the end face, facing the switching part, of the current collector is provided with a second welding protrusion protruding towards the switching part, and the end faces, facing the first welding protrusion and the second welding protrusion make contact with each other, of the first welding protrusion and the second welding protrusion; welding mark areas are arranged on the peripheral wall of the first welding protrusion and the peripheral wall of the second welding protrusion. According to the battery device designed by the invention, the overall size of the heat exchanger is small, and layout and installation of other structures of the battery device are facilitated.

Description

Technical Field

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

[0002] As a rechargeable power source, batteries are increasingly widely used in daily life and industry. When batteries are applied to new energy vehicles, they are mainly used to provide power as the power source for these vehicles.

[0003] In order to maintain the battery device's temperature within a suitable range during use, a heat exchanger is usually installed inside the battery device. However, since the current collector and the adapter ring of the heat exchanger are both plastic parts, and the current collector and the adapter ring are generally formed by end face brazing, the welded end face is relatively wide and the height of the current collector is also higher in order to meet the welding sealing requirements of the current collector and the adapter ring. This makes the current collector prone to interference with other structures, and the limited thickness of the battery cell also affects the installation of the battery cell. Utility Model Content

[0004] In view of the above problems, this application proposes a battery device and an electrical appliance. A first aspect of this application is to provide a battery device in which the heat exchanger is small in overall size, facilitating the layout and installation of other structures within the battery device.

[0005] The second aspect of this application is to provide an electrical device having the aforementioned battery device.

[0006] In a first aspect, this application provides a battery device, including a battery cell assembly and a heat exchanger, wherein the heat exchanger exchanges heat with the battery cell assembly. The heat exchanger includes: a heat exchange body having a heat exchange channel within it, and at least one end of the heat exchange body being open to form an opening; a connecting portion fixed to an end of the heat exchange body, the connecting portion having a protruding first welding protrusion on its end face facing away from the heat exchange body; and a current collector having a collection port, the current collector being fixed to an end of the connecting portion to close the opening, the collection port communicating with the heat exchange channel, and the end face of the current collector facing the connecting portion having a second welding protrusion protruding towards the connecting portion, the first welding protrusion and the second welding protrusion contacting each other's end faces, and the outer peripheral walls of the first welding protrusion and the second welding protrusion having solder areas.

[0007] In the technical solution of this application embodiment, the battery device is provided with a heat exchanger, which has a heat exchange body, a transition part, and a current collector. By designing a first welding protrusion on the transition part and a second welding protrusion on the current collector, the transition part can be welded to the current collector. During the welding connection of the first welding protrusion and the second welding protrusion, at least part of the first welding protrusion and / or at least part of the second welding protrusion will melt. Since the first welding protrusion and / or the second welding protrusion melts part of the structure, the overall size of the first welding protrusion and the second welding protrusion will be reduced, and the overall size of the current collector and the transition part will also be reduced, avoiding interference between the current collector and the transition part and other structures. This allows the heat exchanger to adapt to battery cell modules of more sizes and facilitates the layout and installation of other structures of the battery device. Furthermore, the solder area is located on the outer peripheral wall of the first welding protrusion and the second welding protrusion, and the molten part of the first welding protrusion and the second welding protrusion is also located on the outer peripheral wall. While reducing the overall size of the current collector and the transition part, sufficient welding width is satisfied, ensuring the sealing performance after welding.

[0008] According to some embodiments of this application, the thickness of the second weld protrusion in the thickness direction of the heat exchange body ranges from 1 to 10 mm. When the thickness of the second weld protrusion meets the above-mentioned range, it is possible to ensure a stable connection between the second weld protrusion and the first weld protrusion while avoiding increasing the weight of the collector, ensuring the cost of the collector, and ensuring that the collector port has sufficient flow area.

[0009] According to some embodiments of this application, the minimum distance between the outer peripheral wall of the second weld protrusion and the outer peripheral edge of the current collector ranges from 0.5 to 5 mm. When the minimum distance between the outer peripheral wall of the second weld protrusion and the outer peripheral edge of the current collector meets the above-mentioned range, it is possible to ensure a stable connection between the second weld protrusion and the first weld protrusion while ensuring that it does not interfere with the arrangement of other structures of the battery device.

[0010] According to some embodiments of this application, in the thickness direction of the heat exchange body, the distance between the outer peripheral wall of the second welded protrusion and the outer peripheral edge of the collector is a first distance; in the width direction of the heat exchange body, the minimum distance between the outer peripheral wall of the second welded protrusion and the outer peripheral edge of the collector is a second distance, and the first distance and the second distance are different. That is, the second welded protrusion is provided at one end of the collector, and the outer peripheral wall of the second welded protrusion and the outer peripheral edge of the collector are spaced apart and not equally spaced, so as to facilitate the arrangement of the transition part or other structures.

[0011] According to some embodiments of this application, the first distance is smaller than the second distance to facilitate the arrangement of the adapter or other structures.

[0012] According to some embodiments of this application, the adapter is fitted over the heat exchanger body. This allows the collector to be fixedly connected to the heat exchanger body using the adapter, reducing the assembly difficulty of the collector and heat exchanger body, thereby simplifying the assembly of the heat exchanger and ensuring the assembly quality of the collector and heat exchanger body, while also reducing the risk of leakage at the connection point.

[0013] According to some embodiments of this application, the heat exchanger body is a metal part, and the adapter is injection molded onto the heat exchanger body and formed as a single piece. This allows for a mating connection between the adapter and the heat exchanger body, reducing the difficulty of connecting them while also ensuring the connection strength to a certain extent. This allows the adapter to be stably mounted on the heat exchanger body, facilitating the fixed connection of the collector to the heat exchanger body using the adapter.

[0014] According to some embodiments of this application, the heat exchange body is provided with multiple heat exchange channels, and the transition portion is provided with multiple transition channels; the current collector is provided with at least one guide channel, the current collector port is connected to at least one of the heat exchange channels, and at least two of the heat exchange channels are connected through the guide channel and the transition channel to define a heat exchange loop with at least one bend. This allows the heat exchange medium entering the heat exchange body to sequentially enter at least two heat exchange channels, realizing the series connection of at least two heat exchange channels, thereby increasing the residence time of the heat exchange medium in the heat exchange body and the coverage area of ​​the battery cell assembly, and to a certain extent avoiding large temperature differences between the inlet and outlet of the heat exchange loop, thereby improving the heat exchange uniformity of the heat exchange body, improving the uneven heat exchange phenomenon of the battery cell assembly, meeting the temperature uniformity requirements of the battery cell assembly, and thus reducing the risk of thermal runaway of the battery device, improving the safety of the battery device and extending the service life of the battery device.

[0015] According to some embodiments of this application, a plurality of the transfer channels and a plurality of the heat exchange channels are connected in a one-to-one correspondence, and a flow guide channel is connected to at least two of the transfer channels, so that at least two of the heat exchange channels are connected through the flow guide channel to define a heat exchange circuit having at least one bend. This can reduce the molding difficulty of a heat exchange circuit with at least one bend, thereby enabling at least two heat exchange channels to be connected in series, allowing the heat exchange medium entering the heat exchange body to enter at least two heat exchange channels sequentially, increasing the residence time of the heat exchange medium in the heat exchange body and the coverage area of ​​the battery cell assembly, and to a certain extent avoiding large temperature differences between the inlet and outlet of the heat exchange circuit, thereby improving the heat exchange uniformity of the heat exchange body.

[0016] According to some embodiments of this application, both ends of the heat exchange body are provided with the transition portion and the current collector; each current collector includes a connecting channel communicating with the collection port, the guide channel and the connecting channel are independent and not connected to each other, and each guide channel is provided with two spaced-apart flow holes; the connecting channel of each current collector is connected to one of the heat exchange channels through the transition channel; each guide channel of each current collector is connected to two of the heat exchange channels through the two flow holes, so that two of the heat exchange channels are connected, and the bend is formed between the heat exchange channel and the guide channel. When the heat exchange medium is output to the collection port of one of the current collectors, it can be transported to the connecting channel through the collection port. Since the connecting channel and the guide channel are independent and not connected to each other, and the connecting channel is connected to one of the heat exchange channels through the transition channel, the heat exchange medium transported to the connecting channel can flow into the heat exchange channel along the extension direction of the connecting channel and flow along the extension direction of the heat exchange channel. At this time, the heat exchange medium can exchange heat with the battery cell assembly to achieve the purpose of regulating the temperature of the battery cell assembly.

[0017] According to some embodiments of this application, the battery device further includes a housing, in which both the heat exchanger and the battery cells are disposed, and the heat exchanger and the housing are connected at the same potential. The housing can, to a certain extent, prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells. The heat exchanger, disposed within the housing, is configured to exchange heat with the battery cell assembly, thereby adjusting the temperature of the battery cell assembly using the heat exchanger body. This allows the temperature of the battery cell assembly to be maintained within a suitable temperature range, thus extending the service life of the battery cell assembly and improving its safety during use.

[0018] According to some embodiments of this application, the battery device further includes a first conductive element and a second conductive element. The first conductive element is fixed to the inner wall of the housing, and the second conductive element is fixed to the current collector and / or the adapter and electrically connected to the heat exchange body. The first conductive element and the second conductive element are electrically connected. The first conductive element and the second conductive element connect the heat exchange body and the housing at the same potential, and the housing can, to a certain extent, prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0019] According to some embodiments of this application, the second conductive element and the adapter are plugged into each other. The plugging method is simple and easy to implement. The adapter is provided with a snap-fit ​​part in the width direction of the heat exchange body. The snap-fit ​​part is suitable for plugging into the second conductive element to fix the second conductive element on the heat exchanger and facilitate the electrical connection between the second conductive element and the heat exchange body.

[0020] According to some embodiments of this application, the adapter portion is provided with a slot and a limiting protrusion provided in the slot, and the second conductive member is provided with a limiting hole. The second conductive member is inserted into the slot, and the limiting protrusion and the limiting hole cooperate. The adapter portion has a slot and a limiting protrusion. The second conductive member is inserted through the slot on the adapter portion. When inserted to a certain depth, the limiting hole on the second conductive member is precisely aligned with the limiting hole on the adapter portion, ultimately achieving the insertion and engagement of the adapter portion with the second conductive member, thereby limiting the position of the second conductive member.

[0021] Secondly, this application also proposes an electrical device having the battery device described in the above embodiments.

[0022] In the technical solution of this application embodiment, by adopting the battery device described in the above embodiment, the battery life of the electrical equipment can be guaranteed to a certain extent, and the size of the electrical equipment can be reduced.

[0023] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0024] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0025] Figure 1 This is a schematic diagram of an electrical device according to some embodiments of this application.

[0026] Figure 2 This is an exploded view of a battery device according to some embodiments of this application.

[0027] Figure 3 This is an exploded view of a heat exchanger according to some embodiments of this application.

[0028] Figure 4 This is a schematic diagram of the interface between the adapter and the current collector according to some embodiments of this application.

[0029] Figure 5 This is a schematic diagram of the end structure of the heat exchanger body according to some embodiments of this application.

[0030] Figure 6 for Figure 5 A schematic diagram of the structure when the second conductive element in the middle structure is separated from the transition part.

[0031] Figure 7 This is an exploded view of a battery device according to other embodiments of this application.

[0032] Figure 8 for Figure 7 Enlarged view of the middle section structure.

[0033] Figure 9 for Figure 7 Cross-sectional view of the middle part of the structure.

[0034] Figure 10 for Figure 7 Side view of the structure.

[0035] Figure 11 for Figure 10 A cross-sectional view of a local structure from one perspective.

[0036] Figure 12 for Figure 10 A cross-sectional view of the local structure from another perspective.

[0037] The reference numerals in the detailed embodiments are as follows:

[0038] 1000. Electrical equipment; 200. Controllers; 300. Motors;

[0039] 1. Battery device;

[0040] 10. Battery cell modules;

[0041] 20. Heat exchanger;

[0042] 21. Heat exchanger body; 21a. Heat exchange channel; 211. Separating rib;

[0043] 22. Adapter section; 221. First welding protrusion; 22a. Adapter channel; 222. Slot; 223. Limiting protrusion; 224. Outer ring; 225. Adapter plate;

[0044] 23. Current collector; 23a. Current collector port; 23b. Flow guide channel; 23c. Through hole; 231b. Flow bypass hole; 23c. Connecting channel; 231. Second welding protrusion; 241. Bend; 242. Heat exchange circuit;

[0045] 30. Box body; 31. First part; 32. Second part;

[0046] 42. Second conductive element; 42a. Limiting hole;

[0047] 50. Sealing component; 51. Insertion groove; 52. Limiting protrusion. Detailed Implementation

[0048] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0049] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction 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.

[0052] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0053] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace, among other fields.

[0054] As the application fields of battery devices continue to expand, the market demand for them is also constantly increasing.

[0055] When the battery device is working, a large amount of heat is generated due to the discharge of the positive and negative electrodes of the battery cells and the chemical reaction of the electrolyte inside the battery cells, which causes the temperature of the battery cells to rise.

[0056] In related technologies, in order to reduce the temperature of individual battery cells, heat exchangers are usually installed in the battery device. The heat exchangers exchange heat with the individual battery cells to maintain the temperature of the individual battery cells within a suitable temperature range. This ensures the working performance of the individual battery cells to a certain extent, extends the service life of the individual battery cells, and improves the safety of the individual battery cells in use.

[0057] The heat exchanger generally includes an inlet liquid collector, an outlet liquid collector, and a heat exchange tube disposed between the inlet liquid collector and the outlet liquid collector. The heat exchange medium is introduced into the heat exchange tube through the inlet liquid collector. The heat exchange medium circulates in the heat exchange tube and is discharged from the outlet liquid collector. The heat exchange medium can be a cooling medium or a heating medium. The heat exchange medium can circulate in the heat exchange tube to achieve heat exchange with the battery cells, thereby achieving the purpose of regulating the temperature of the battery device.

[0058] However, the applicant has discovered that since both the collector and the adapter ring of the heat exchanger are plastic parts, the collector and the adapter ring are generally formed by end face brazing. In order to meet the welding sealing of the collector and the adapter ring, the welding end face is wider and the height of the collector is also higher, which makes the collector prone to interference with other structures. In addition, the thickness that can be used for the battery cell is limited, which will also affect the installation of the battery cell.

[0059] To improve upon at least one of the aforementioned technical problems, this application provides a battery device 1. The heat exchanger 20 within the battery device 1 includes a heat exchange body 21, a connecting portion 22, and a current collector 23. The connecting portion 22 has a first welding protrusion 221 on its end face facing the current collector 23, and the current collector 23 has a second welding protrusion 231 on its end face facing the connecting portion 22. The first welding protrusion 221 and the second welding protrusion 231 are in contact with each other, so that the first welding protrusion 221 and the second welding protrusion 231 are welded together through the weld areas on the outer peripheral walls of the first welding protrusion 221 and the second welding protrusion 231. This welding connection improves the connection strength between the connecting portion 22 and the current collector 23, and makes the connection between them more stable. The outer peripheral walls of the first welding protrusion 221 and the second welding protrusion 231 are welded together to achieve circumferential welding, thereby improving the welding strength of the first welding protrusion 221 and the second welding protrusion 231.

[0060] Furthermore, the first welding protrusion 221 protrudes from the adapter 22, and the second welding protrusion 231 protrudes from the current collector 23. During the welding connection of the first welding protrusion 221 and the second welding protrusion 231, at least a portion of the first welding protrusion 221 and / or at least a portion of the second welding protrusion 231 will melt to achieve the welding connection of the first welding protrusion 221 and the second welding protrusion 231. Here, since the first welding protrusion 221 and / or the second welding protrusion 231 melt a portion of the structure, the overall size of the first welding protrusion 221 and the second welding protrusion 231 will be reduced, which will also reduce the overall size of the current collector 23 and the adapter 22, thus avoiding interference between the current collector 23 and the adapter 22 and other structures.

[0061] In short, with increasing emphasis on battery device performance, the battery device 1 of this application embodiment, through the design of the heat exchanger 20, can reduce the overall size of the heat exchanger 20, facilitating the layout and installation of other structures of the battery device 1.

[0062] The battery device 1 disclosed in this application embodiment can be applied to an electrical device 1000, which can refer to a mobile phone, tablet, laptop, electric toy, power tool, electric vehicle, electric car, ship, spacecraft, etc.

[0063] Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; spacecraft can include airplanes, rockets, space shuttles, and spacecraft; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0064] For ease of explanation, the following embodiments use a vehicle as an example to describe in detail the structure of the electrical device 1000 and the battery device 1 of this application.

[0065] Please refer to Figure 1 The electrical equipment 1000 is a vehicle, which 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. The vehicle is equipped with a battery device 1, which can be located at the bottom, front, or rear of the vehicle. The battery device 1 can be used to power the vehicle; for example, it can serve as the vehicle's operating power source.

[0066] like Figure 1 As shown, the vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 1 to supply power to the motor 300, for example, for the power needs of the vehicle during starting, navigation and driving.

[0067] In some embodiments of this application, the battery device 1 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.

[0068] You can refer to this. Figures 1-12 According to this application, the battery device 1 includes a battery cell assembly 10 and a heat exchanger 20. The heat exchanger 20 exchanges heat with the battery cell assembly 10. The heat exchanger 20 includes a heat exchange body 21, a connecting part 22, and a current collector 23. The heat exchange body 21 has a heat exchange channel 21a, and at least one end of the heat exchange body 21 is open to form an opening. The connecting part 22 is fixed to the end of the heat exchange body 21, and the end face of the connecting part 22 facing away from the heat exchange body 21 has a protruding first welding protrusion. 221; The current collector 23 is provided with a collection port 23a. The current collector 23 is fixed to the end of the adapter 22 to close the open opening. The collection port 23a is connected to the heat exchange channel 21a. The end face of the current collector 23 facing the adapter 22 is provided with a second welding protrusion 231 protruding towards the adapter 22. The end faces of the first welding protrusion 221 and the second welding protrusion 231 are in contact with each other. The outer peripheral walls of the first welding protrusion 221 and the outer peripheral walls of the second welding protrusion 231 are provided with welding areas.

[0069] Here, the battery device 1 mentioned in the embodiments of this application refers to a single physical module comprising multiple battery cells to provide higher voltage and capacity. For example, the battery device 1 mentioned in this application can be a battery cell assembly 10 or multiple battery cells, etc. The battery cell assembly 10 generally includes multiple battery cells.

[0070] Furthermore, in the battery device 1, multiple battery cell modules 10 can be connected in series, in parallel, or in a mixed manner. A mixed connection means that multiple battery cell modules 10 can be connected in both series and parallel, and multiple battery cell modules 10 can be directly connected in series, in parallel, or in a mixed manner to form the battery device 1 of this application.

[0071] In some embodiments, the battery device 1 includes multiple sets of battery cell assemblies 10. During the assembly process of the battery device 1, the battery device 1 may also be composed of multiple battery cells first connected in series, in parallel or in a mixed manner to form a battery cell assembly 10, and then the multiple battery cell assemblies 10 are connected in series, in parallel or in a mixed manner to form a whole.

[0072] In some embodiments, the battery device 1 may also include other structures, such as electrical connectors for enabling electrical connections between multiple battery cell assemblies 10.

[0073] The electrical connectors mentioned here can be understood as busbars.

[0074] Meanwhile, the battery cell can be a cuboid, or it can be a cylinder, a polygonal prism, a flat body, or other shapes.

[0075] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these. Battery cells are generally divided 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.

[0076] For example, a single battery cell typically includes a housing, a cell assembly, and an electrolyte. The housing is used to house the cell assembly and the electrolyte, and the housing has at least one positive electrode post and at least one negative electrode post. The cell assembly includes one or more electrode assemblies, which are formed by stacking or winding positive electrode sheets, negative electrode sheets, and separators.

[0077] The positive electrode generally includes a positive current collector 23 and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector 23. Multiple positive electrode tabs are stacked together and electrically connected to the positive electrode post. For example, the multiple stacked positive electrode tabs can be directly welded to the positive electrode post to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter piece, with the multiple stacked positive electrode tabs welded to one end of the positive electrode adapter piece, and the other end of the positive electrode adapter piece welded to the positive electrode post, so that the positive electrode tabs and the positive electrode post form an electrical connection.

[0078] The negative electrode generally includes a negative current collector 23 and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector 23. Multiple negative electrode tabs are stacked together and electrically connected to the negative electrode post. For example, the stacked negative electrode tabs can be directly welded to the negative electrode post to form an electrical connection; alternatively, the battery cell assembly may also include a negative electrode adapter piece, with the stacked negative electrode tabs welded to one end of the adapter piece, and the other end of the adapter piece welded to the negative electrode post, thus forming an electrical connection between the negative electrode tabs and the negative electrode post. The material of the separator is not limited; for example, it can be polypropylene or polyethylene.

[0079] The heat exchanger 20 disclosed in this application embodiment is used to contain the heat exchange medium to regulate the temperature of the battery cell assembly 10. The heat exchanger 20 can exchange heat with the battery cell assembly 10 for cooling or heating the battery cell assembly 10. That is, the heat exchanger 20 can cool the battery cell assembly 10. The heat exchanger 20 can also be called a cooling element, cooling system, cooling plate, liquid cooling plate, etc. The heat exchanger 20 can also heat the battery cell assembly 10 that is working in a low temperature environment, so that the temperature of the battery cell assembly 10 reaches the working range temperature for normal power supply.

[0080] The heat exchange medium mentioned here can be water, refrigerant, etc.

[0081] Specifically, the heat exchanger 20 includes at least a heat exchange body 21, a connecting portion 22, and a current collector 23. The heat exchange body 21 provides stable support, constraint, and anti-deformation for the battery cell assembly 10. The heat exchange body 21 includes a heat exchange channel 21a. In some embodiments, at least one heat exchange channel is constructed. The heat exchange channel 21a is mainly filled with a heat exchange medium to facilitate heat exchange between the heat exchange body 21 and the battery cell assembly 10. This achieves the purpose of adjusting the temperature of the battery cell assembly 10 using the heat exchanger 20, reducing the risk of thermal runaway in the battery cell assembly 10, and ensuring the working performance of the battery cell assembly 10 to a certain extent. In some embodiments, the heat exchange body 21 can be a flat tube-shaped heat exchange tube, and the cross-section of the heat exchange channel 21a can be a conventional shape such as circular, rectangular, or elliptical, or other irregular shapes.

[0082] The adapter 22 is located at the end of the heat exchange body 21 and is fixedly fitted to the heat exchange body 21. It should be noted that fixing the adapter 22 at the end of the heat exchange body 21 can reduce the assembly difficulty of the adapter 22 and the heat exchange body 21, and can also increase the contact area between the adapter 22 and the heat exchange body 21, which is beneficial to improving the connection strength between the adapter 22 and the heat exchange body 21, and making the relative position of the adapter 22 and the heat exchange body 21 stable.

[0083] Furthermore, the adapter 22 can be provided at at least one end of the heat exchange body 21, or the adapter 22 can be provided only at the end of the heat exchange body 21 where an open opening is formed, so as to fix the collector 23 on the heat exchange body 21. The collector 23 is located on the side of the adapter 22 away from the heat exchange body 21 and is fixed to the adapter 22. The collector 23 can be connected to the heat exchange body 21 through the adapter 22. The collector 23 is provided with a collection port 23a, which communicates with at least one heat exchange channel 21a to realize the delivery of heat exchange medium into the heat exchange channel 21a, that is, to realize the delivery of heat exchange medium into the heat exchange body 21.

[0084] In some embodiments, multiple heat exchange channels 21a extend from one end to the other end along the length of the heat exchange body 21, and the heat exchange medium 23 is disposed at both ends along the length of the heat exchange body 21. The heat exchange medium can circulate unidirectionally within the heat exchange body 21, that is, the heat exchange medium can enter from the heat exchange body 21 at one end of the heat exchange body 21 and then be discharged directly from the heat exchange body 21 at the other end of the heat exchange body 21.

[0085] Of course, in some other embodiments, the heat exchange medium may also circulate repeatedly within the heat exchange body 21 before being discharged through the collector 23.

[0086] By using the adapter 22 to fix the collector 23 to the heat exchange body 21, compared with directly fixing the collector 23 to the heat exchange body 21, the assembly difficulty of the collector 23 and the heat exchange body 21 can be reduced, thereby reducing the assembly difficulty of the heat exchanger 20, and it is beneficial to ensure the assembly quality of the collector 23 and the heat exchange body 21, reduce the risk of leakage at the connection between the collector 23 and the heat exchange body 21, and facilitate the separate processing of the collector 23 and the adapter 22.

[0087] It is worth mentioning that the end face of the adapter 22 facing the current collector 23 is provided with a first welding protrusion 221, and the end face of the current collector 23 facing the adapter 22 is provided with a second welding protrusion 231. The first welding protrusion 221 and the second welding protrusion 231 are in contact with each other so that the first welding protrusion 221 and the second welding protrusion 231 are welded together through the weld area of ​​the outer peripheral wall of the first welding protrusion 221 and the outer peripheral wall of the second welding protrusion 231. The welding connection method can improve the connection strength between the adapter 22 and the current collector 23, and make the connection between the adapter 22 and the current collector 23 more stable. The outer peripheral walls of the first welding protrusion 221 and the second welding protrusion 231 are welded together to achieve circumferential welding and improve the welding strength of the first welding protrusion 221 and the second welding protrusion 231.

[0088] Furthermore, the first welding protrusion 221 protrudes from the adapter 22, and the second welding protrusion 231 protrudes from the current collector 23. During the welding connection of the first welding protrusion 221 and the second welding protrusion 231, at least a portion of the first welding protrusion 221 and / or at least a portion of the second welding protrusion 231 will melt to achieve the welding connection of the first welding protrusion 221 and the second welding protrusion 231. Here, since the first welding protrusion 221 and / or the second welding protrusion 231 melt a portion of the structure, the overall size of the first welding protrusion 221 and the second welding protrusion 231 will be reduced, which will also reduce the overall size of the current collector 23 and the adapter 22, thus avoiding interference between the current collector 23 and the adapter 22 and other structures.

[0089] In some embodiments, the outer peripheral walls of the first welding protrusion 221 and the second welding protrusion 231 can be welded together by hot melt, laser or ultrasonic welding.

[0090] In the technical solution of this application embodiment, the battery device 1 is provided with a heat exchanger 20. The heat exchanger 20 has a heat exchange body 21, a connecting part 22, and a current collector 23. By designing a first welding protrusion 221 on the connecting part 22 and a second welding protrusion 231 on the current collector 23, the connecting part 22 can be welded to the current collector 23. During the welding connection process of the first welding protrusion 221 and the second welding protrusion 231, at least a portion of the first welding protrusion 221 and / or at least a portion of the second welding protrusion 231 will melt. Since the first welding protrusion 221 and / or the second welding protrusion 231 melt a portion of the structure, the first welding protrusion... The overall size of the first welding protrusion 221 and the second welding protrusion 231 will be reduced, which will also reduce the overall size of the current collector 23 and the adapter 22. This will prevent the current collector 23 and the adapter 22 from interfering with other structures, allowing the heat exchanger 20 to be adapted to battery cell assemblies 10 of more sizes and facilitating the layout and installation of other structures of the battery device 1. Furthermore, the solder area is located on the outer peripheral wall of the first welding protrusion 221 and the second welding protrusion 231, and the molten part of the first welding protrusion 221 and the second welding protrusion 231 is also located on the outer peripheral wall. While reducing the overall size of the current collector 23 and the adapter 22, sufficient welding width is provided to ensure the sealing performance after welding.

[0091] According to some embodiments of this application, such as Figure 4 As shown, the thickness of the second welding protrusion 231 in the thickness direction of the heat exchanger body 21 ranges from 1 to 10 mm. Here, the thickness direction of the second welding protrusion 231 is consistent with the thickness direction of the heat exchanger body 21. The thickness of the second welding protrusion 231 should not be too large, as this would increase the weight of the collector 23 and reduce the flow rate of the collector port 23a. At the same time, the thickness of the second welding protrusion 231 should not be too small, as this would affect the welding effect between the second welding protrusion 231 and the first welding protrusion 221, as well as the welding connection strength between the second welding protrusion 231 and the first welding protrusion 221. Therefore, when the thickness of the second welding protrusion 231 is between 1 and 10 mm, it is possible to ensure a stable connection between the second welding protrusion 231 and the first welding protrusion 221 while avoiding increasing the weight of the collector 23, ensuring the cost of the collector 23, and ensuring that the collector port 23a has sufficient flow area. For example, the thickness of the second welding protrusion 231 can be 1mm, 3mm, 6.5mm, 8.6mm, 10mm, etc.

[0092] According to some embodiments of this application, such as Figure 4As shown, the minimum distance between the outer peripheral wall of the second welding protrusion 231 and the outer peripheral edge of the current collector 23 ranges from 0.5 to 5 mm. Here, the second welding protrusion 231 is provided at the end of the current collector 23 facing the transition portion 22, and the second welding protrusion 231 extends in a direction away from the current collector 23. Furthermore, the outer peripheral wall of the second welding protrusion 231 and the outer peripheral edge of the current collector 23 are spaced apart, so that the connection between the second welding protrusion 231 and the first welding protrusion 221 is located inside the current collector 23 and the transition portion 22. This avoids the welding portion of the second welding protrusion 231 and the first welding protrusion 221 interfering with the arrangement of other structures of the battery device 1, and avoids damage to the welding portion of the second welding protrusion 231 and the first welding protrusion 221 by other structures of the battery device 1, thus ensuring the welding effect of the second welding protrusion 231 and the first welding protrusion 221.

[0093] The minimum distance between the outer peripheral wall of the second welding protrusion 231 and the outer peripheral edge of the current collector 23 should not be too small. If it is too small, the outer peripheral wall of the second welding protrusion 231 and the outer peripheral edge of the current collector 23 will be approximately on the same plane, causing the outer peripheral wall of the second welding protrusion 231 to be located at the outer peripheral edge of the current collector 23, exposing the second welding protrusion 231. This will interfere with the arrangement of other structures in the battery device 1 and may damage other structures in the battery device 1. The welded portion between the second welding protrusion 231 and the first welding protrusion 221 may be damaged. This can affect the welding effect between the second welding protrusion 231 and the first welding protrusion 221. Furthermore, the minimum distance between the outer peripheral wall of the second welding protrusion 231 and the outer peripheral edge of the current collector 23 should not be too large, as this would reduce the flow rate of the current collector 23a. Also, since the second welding protrusion 231 is located relatively deep inside the current collector 23 and the transition portion 22, it will affect the welding effect between the second welding protrusion 231 and the first welding protrusion 221, and also affect the welding connection strength between them. Therefore, when the minimum distance between the outer peripheral wall of the second welding protrusion 231 and the outer peripheral edge of the current collector 23 is between 0.5 and 5 mm, a stable connection between the second welding protrusion 231 and the first welding protrusion 221 can be ensured without interfering with the other structural arrangements of the battery device 1. For example, the minimum distance between the outer peripheral wall of the second welding protrusion 231 and the outer peripheral edge of the current collector 23 can be 0.5 mm, 1 mm, 2.5 mm, 3.6 mm, 5 mm, etc.

[0094] According to some embodiments of this application, such as Figure 4As shown, in the thickness direction of the heat exchange body 21, the distance between the second welded protrusion 231 and the outer periphery of the current collector 23 is the first distance d1; in the width direction of the heat exchange body 21, the minimum distance between the second welded protrusion 231 and the outer periphery of the current collector 23 is the second distance d2. The first distance and the second distance are different, that is, d1 ≠ d2. Specifically, the heat exchange body 21 has a length direction, a width direction, and a thickness direction. The heat exchange body 21 extends along the length direction. The cross-section of the current collector 23 in the length direction of the heat exchange body 21 extends along the width direction and the thickness direction of the heat exchange body 21, respectively. The distance between the second welded protrusion 231 and the outer periphery of the current collector 23 in the thickness direction of the heat exchange body 21 is the first distance d1, and the distance between the second welded protrusion 231 and the outer periphery of the current collector 23 in the width direction of the heat exchange body 21 is the second distance d2. The first distance d1 and the second distance d2 are different. In some embodiments, the dimensions of the adapter 22 in the width direction of the heat exchange body 21 are different from those in the thickness direction of the heat exchange body 21. The dimensions of the current collector 23 are adapted to the dimensions of the adapter 22. That is, the second welding protrusion 231 protrudes from one end of the current collector 23, and the outer peripheral wall of the second welding protrusion 231 and the outer peripheral edge of the current collector 23 are spaced apart and are not equally spaced, so as to facilitate the arrangement of the adapter 22 or other structures.

[0095] According to some embodiments of this application, such as Figure 4 As shown, the first distance is less than the second distance, i.e., d1 < d2. In some embodiments, the transition portion 22 is provided with other structures in the width direction of the heat exchange body 21, so the size of the transition portion 22 in the thickness direction of the heat exchange body 21 is smaller than the size of the transition portion 22 in the width direction of the heat exchange body 21, and the first distance d1 between the second welding protrusion 231 and the outer periphery of the current collector 23 in the thickness direction of the heat exchange body 21 is less than the second distance d2 between the second welding protrusion 231 and the outer periphery of the current collector 23 in the width direction of the heat exchange body 21, so as to accommodate the arrangement of the transition portion 22 or other structures.

[0096] According to some embodiments of this application, such as Figure 3 As shown, the adapter 22 is fitted over the heat exchanger body 21. Specifically, the adapter 22 is fitted over the heat exchanger body 21, and the collector 23 is fixed to the adapter 22. This allows the collector 23 to be fixedly connected to the heat exchanger body 21 using the adapter 22. Compared to directly fixing the collector 23 to the heat exchanger body 21, this reduces the assembly difficulty of the collector 23 and the heat exchanger body 21, thereby reducing the assembly difficulty of the heat exchanger 20. It also helps to ensure the assembly quality of the collector 23 and the heat exchanger body 21, reduces the risk of leakage at the connection between the collector 23 and the heat exchanger body 21, and facilitates the separate processing of the collector 23 and the adapter 22.

[0097] In some embodiments, the adapter 22 is an injection molded part, and the current collector 23 is fixedly connected to the adapter 22. By making the adapter 22 an injection molded part, the molding difficulty of the adapter 22 is reduced, while the structural strength of the adapter 22 is improved, so as to ensure the working performance of the adapter 22 to a certain extent.

[0098] Meanwhile, by fixing the collector 23 to the adapter 22, the collector 23 can be fixedly connected to the heat exchange body 21 using the adapter 22, thereby reducing the assembly difficulty of the collector 23 and the heat exchange body 21, thus reducing the assembly difficulty of the heat exchanger 20, and ensuring the connection quality of the collector 23 and the heat exchange body 21 to a certain extent.

[0099] In some embodiments, the adapter 22 and the collector 23 are welded or glued together. This means that the adapter 22 and the collector 23 can be fixedly connected by welding or by gluing. These connection methods reduce the difficulty of connecting the adapter 22 and the collector 23 while also increasing the connection strength, resulting in a stable connection between them. This facilitates the use of the adapter 22 to fix the collector 23 to the heat exchanger body 21.

[0100] The welding mentioned here can be laser welding or infrared welding, etc.

[0101] Of course, in some other embodiments, the adapter 22 and the current collector 23 can also be injection molded.

[0102] In some embodiments, the end of the adapter 22 may also be directly mated with the end of the current collector 23 facing the adapter 22, and then connected by welding or bonding after mating, so as to achieve a fixed connection between the adapter 22 and the current collector 23.

[0103] It should be noted that by welding or bonding the adapter 22 and the current collector 23 to form a fixed connection, compared with snap-fit, the sealing performance at the connection between the adapter 22 and the current collector 23 can be improved. This can, to some extent, avoid the need to set a seal between the adapter 22 and the current collector 23, reduce the cost of the heat exchanger 20, and reduce the size of the heat exchanger 20, making the current collector 23 thinner in the thickness direction, which is suitable for thinner battery cell assembly 10.

[0104] In a specific example, one end of the adapter 22 is sleeved over one end of the heat exchange body 21, and the other end of the adapter 22 is directly opposite the end of the collector 23 facing the adapter 22. The adapter 22 and the collector 23 are fixedly connected through the connection of the first welding protrusion 221 and the second welding protrusion 231, thereby achieving a fixed connection between the adapter 22 and the heat exchange body 21 and the collector 23, reducing the connection difficulty and improving the connection quality.

[0105] In some embodiments, the current collector 23 is formed as an injection molded part to reduce the molding difficulty of the current collector 23 and improve the structural strength of the current collector 23, so as to ensure the working performance of the current collector 23 to a certain extent.

[0106] In some embodiments, the current collector 23 is provided with a through hole 23c, which is formed as a draft hole to reduce the injection molding difficulty of the current collector 23.

[0107] In some embodiments, multiple heat exchange channels 21a extend from one end to the other in the length direction of the heat exchange body 21, and the heat collector 23 is disposed at both ends in the length direction of the heat exchange body 21. The heat exchange medium circulates repeatedly in the heat exchange body 21 and is then discharged through the heat collector 23.

[0108] In some embodiments, both the adapter 22 and the current collector 23 are plastic parts. That is, both the adapter 22 and the current collector 23 are made of plastic material. This makes it easier to make the material of the current collector 23 the same as that of the adapter 22, thereby facilitating the fixed connection between the adapter 22 and the current collector 23, reducing the difficulty of connecting the adapter 22 and the current collector 23, and improving the connection quality.

[0109] At the same time, by making the current collector 23 into a plastic material, the weight of the current collector 23 can be reduced and the manufacturing cost of the current collector 23 can be lowered.

[0110] According to some embodiments of this application, the heat exchanger body 21 is a metal part, and the adapter 22 is injection molded onto the heat exchanger body 21 and formed as an integral part with the heat exchanger body 21. Specifically, during the processing of the heat exchanger 20, the heat exchanger body 21 is first processed and formed, and then the adapter 22 is integrally injection molded with the heat exchanger body 21 to achieve a mating connection between the adapter 22 and the heat exchanger body 21. This reduces the difficulty of connecting the adapter 22 and the heat exchanger body 21, while also ensuring the connection strength between the adapter 22 and the heat exchanger body 21 to a certain extent, so that the adapter 22 can be stably set at one end of the heat exchanger body 21, thereby facilitating the use of the adapter 22 to fix the collector 23 to the heat exchanger body 21.

[0111] On the one hand, the adapter 22 is injection molded onto the heat exchange body 21, making the adapter 22 and the heat exchange body 21 an integral part. On the other hand, the adapter 22 is fixedly connected to the collector 23, thereby realizing the mating connection between the collector 23 and the heat exchange body 21. This solves the technical problem in the prior art that the metal heat exchange body 21 and the injection-molded collector 23 cannot achieve the integral welding of multiple dissimilar materials. At the same time, it can also solve the technical problem that the connection between the metal heat exchange body 21 and the injection-molded collector 23 is costly.

[0112] Meanwhile, by integrally injection molding the adapter 22 and the heat exchange body 21, compared with welding, bonding or snap-fitting, the sealing performance and pressure resistance of the connection between the adapter 22 and the heat exchange body 21 can be increased, realizing the connection between the adapter channel 22a and the heat exchange channel 21a and reducing the risk of leakage.

[0113] In addition, by making the heat exchanger body 21 a metal part, it is also beneficial to improve the structural strength of the heat exchanger body 21 and enhance the heat exchange effect of the heat exchanger body 21, thus ensuring the working performance of the heat exchanger body 21 to a certain extent.

[0114] The metal parts mentioned here can be iron, copper, or aluminum, etc.

[0115] Of course, in some other embodiments, the heat exchanger body 21 may also be made of plastic. In some embodiments, the adapter 22 is a plastic part. That is, the adapter 22 is made of plastic material, which on the one hand allows the adapter 22 to be injection molded onto the heat exchanger body 21 and formed into a single piece with the heat exchanger body 21, reducing the difficulty of connecting the adapter 22 to the heat exchanger 20; on the other hand, it can also reduce the weight of the adapter 22 and reduce the manufacturing cost of the adapter 22.

[0116] In some embodiments, the outer surface of the heat exchanger body 21 is provided with a first region, the roughness of which is greater than that of the other regions, and the first region is in contact with the adapter 22. In this way, when the adapter 22 is injection molded onto the heat exchanger body 21 and formed into a single piece with the heat exchanger body 21, the first region can be used to increase the bonding force between the heat exchanger body 21 and the adapter 22, thereby increasing the connection strength between the heat exchanger body 21 and the adapter 22, so that the adapter 22 can be stably disposed on the heat exchanger body 21, and it is convenient to use the adapter 22 to fix the current collector 23 to the heat exchanger body 21.

[0117] Meanwhile, by stably mounting the adapter 22 on the heat exchanger body 21, the structural stability of the heat exchanger 20 can be improved, thus ensuring the working performance of the heat exchanger 20 to a certain extent.

[0118] The first region mentioned here can be understood as the region near the end of the heat exchange body 21. Between the two end regions, the heat exchange body 21 also has a second region, which can be understood as the remaining regions of the heat exchange body 21. By setting the roughness of the first region to be greater than that of the remaining regions, when the first region comes into contact with the transition part 22, the bonding force between the heat exchange body 21 and the transition part 22 can be increased, thereby increasing the connection strength between the heat exchange body 21 and the transition part 22.

[0119] In some embodiments, the heat exchange body 21 is made of a metallic material, and the first region of the heat exchange body 21 is roughened to increase the roughness of the first region, thereby setting the roughness of the first region to be greater than that of the other regions.

[0120] Here, the roughness value of the first region is not specifically limited; the larger the roughness value, the better.

[0121] Of course, in some other embodiments, multiple protrusions and / or multiple grooves may be provided in the first region. The combination of multiple protrusions and / or multiple grooves can also increase the roughness of the first region, thereby setting the roughness of the first region to be greater than that of the other regions, and increasing the bonding force between the heat exchange body 21 and the adapter 22.

[0122] According to some embodiments of this application, such as Figure 11 , Figure 12 As shown, the heat exchange body 21 is provided with a plurality of heat exchange channels 21a, and the transition part 22 is provided with a plurality of transition channels 22a; the collector 23 is provided with at least one guide channel 23b, the collector port 23a is connected to at least one heat exchange channel 21a, and at least two heat exchange channels 21a are connected through the guide channel 23b and the transition channel 22a to define a heat exchange circuit 242 having at least one bend 241. Here, multiple transfer channels 22a are respectively configured to correspond to multiple heat exchange channels 21a. By connecting at least two heat exchange channels 21a through a flow guide channel 23b and a transfer channel 22a to define a heat exchange circuit 242 with at least one bend 241, the heat exchange medium entering the heat exchange body 21 can sequentially enter at least two heat exchange channels 21a, realizing the series connection of at least two heat exchange channels 21a. This increases the residence time of the heat exchange medium in the heat exchange body 21 and the coverage area of ​​the battery cell assembly 10, and to a certain extent avoids large temperature differences between the inlet and outlet of the heat exchange circuit 242. This improves the heat exchange uniformity of the heat exchange body 21, improves the uneven heat exchange phenomenon of the battery cell assembly 10, meets the temperature uniformity requirements of the battery cell assembly 10, and reduces the risk of thermal runaway of the battery device 1, improves the safety of the battery device 1 and extends the service life of the battery device 1.

[0123] In some embodiments, the manifold 23a is connected to at least one transition channel 22a. Since the transition channel 22a is connected to the heat exchange channel 21a, the manifold 23a is connected to at least one heat exchange channel 21a, thereby reducing the difficulty of connecting the manifold 23a and the heat exchange channel 21a. This facilitates the use of the manifold 23 and the transition part 22 to define a heat exchange circuit 242 with at least one bend 241 within the heat exchange body 21, thereby improving the heat exchange effect of the heat exchange body 21 and ensuring the working performance of the heat exchanger 20 to a certain extent.

[0124] According to some embodiments of this application, such as Figure 11 , Figure 12 As shown, multiple transition channels 22a and multiple heat exchange channels 21a are connected one-to-one, and a flow guide channel 23b is connected to at least two transition channels 22a, so that at least two heat exchange channels 21a are connected through the flow guide channel 23b to define a heat exchange circuit 242 with at least one bend 241. This can reduce the molding difficulty of the heat exchange circuit 242 with at least one bend 241, thereby realizing the series connection of at least two heat exchange channels 21a, so that the heat exchange medium entering the heat exchange body 21 can enter the at least two heat exchange channels 21a in sequence, increasing the residence time of the heat exchange medium in the heat exchange body 21 and the coverage area of ​​the battery cell assembly 10, and to a certain extent avoiding large temperature differences between the inlet and outlet of the heat exchange circuit 242, thereby improving the heat exchange uniformity of the heat exchange body 21.

[0125] According to some embodiments of this application, such as Figure 3 , Figure 7As shown, both ends of the heat exchange body 21 are provided with a transition section 22 and a collector 23; each collector 23 includes a connecting channel 23c that communicates with the collection port 23a, and a guide channel 23b that is independent and not connected to the connecting channel 23c. Each guide channel 23b is provided with two spaced-apart flow holes 231b; the connecting channel 23c of each collector 23 is connected to one of the heat exchange channels 21a through the transition channel 22a; each guide channel 23b of each collector 23 is connected to two of the heat exchange channels 21a through the two flow holes 231b, so that the two heat exchange channels 21a are connected, and a bend 241 is formed between the heat exchange channel 21a and the guide channel 23b. When the heat exchange medium is output to the collection port 23a of one of the current collectors 23, it can be transported to the connecting channel 23c through the collection port 23a. Since the connecting channel 23c and the guiding channel 23b are independent and not connected, and the connecting channel 23c is connected to one of the heat exchange channels 21a through the transfer channel 22a, the heat exchange medium transported to the connecting channel 23c can flow into the heat exchange channel 21a along the extension direction of the connecting channel 23c and flow along the extension direction of the heat exchange channel 21a. At this time, the heat exchange medium can exchange heat with the battery cell assembly 10 to achieve the purpose of regulating the temperature of the battery cell assembly 10.

[0126] Meanwhile, since each flow channel 23b is connected to two heat exchange channels 21a through two flow-around holes 231b, when the heat exchange medium flowing into the heat exchange body 21 flows into the heat exchange channel 21a connected to the flow-around hole 231b, the heat exchange medium can flow through the flow-around hole 231b into the flow channel 23b, and then flow through the flow channel 23b into another heat exchange channel 21a connected to the flow-around hole 231b. This allows the heat exchange medium entering the heat exchange body 21 to enter at least two heat exchange channels 21a in sequence, increasing the residence time of the heat exchange medium in the heat exchange body 21 and the coverage area of ​​the battery cell assembly 10, and to a certain extent avoiding large temperature differences between the inlet and outlet of the heat exchange circuit 242, thereby improving the uniformity of heat exchange in the heat exchange body 21.

[0127] The collectors 23 at both ends of the heat exchange body 21 are respectively formed as an inlet collector and an outlet collector. Both the inlet collector and the outlet collector include a collection port 23a, a connecting channel 23c communicating with the collection port 23a, and a guide channel 23b spaced apart from the connecting channel 23c. The heat exchange body 21 has multiple heat exchange channels 21a. The multiple heat exchange channels 21a and multiple transition channels 22a are connected one-to-one. At least one heat exchange channel 21a is connected to the connecting channel 23c on the inlet collector and the guide channel 23b on the outlet collector through the transition part 22. At least one heat exchange channel 21a is connected to the guide channel 23b on the inlet collector and the guide channel 23b on the outlet collector through the transition part 22. At least one more heat exchange channel 21a is connected to the guide channel 23b on the inlet collector and the connecting channel 23c on the outlet collector through the transition part 22.

[0128] With the above configuration, when the heat exchange medium enters the liquid inlet collector through the collection port 23a on the liquid inlet collector, the heat exchange medium first flows along the extension direction of the connecting channel 23c and flows into the heat exchange channel 21a in the heat exchange body 21. At the same time, the heat exchange medium in the heat exchange channel 21a can flow to the guide channel 23b on the liquid outlet collector, and flow along the guide channel 23b on the liquid outlet collector to other heat exchange channels 21a in the heat exchange body 21. The heat exchange medium in the heat exchange channel 21a can also flow to the guide channel 23b on the liquid inlet collector, and flow through the guide channel 23b to some other heat exchange channels 21a in the heat exchange body 21. Finally, it flows out sequentially through the heat exchange channel 21a, the connecting channel 23c on the liquid outlet collector, and the collection port 23a on the liquid outlet collector.

[0129] The flow direction of the heat exchange medium ensures that it enters at least three heat exchange channels 21a sequentially, thereby forming an S-shaped heat exchange loop 242. This increases the residence time of the heat exchange medium in the heat exchange body 21 and the coverage area of ​​the battery cell assembly 10, and to a certain extent avoids large temperature differences between the inlet and outlet of the heat exchange loop 242, thereby improving the heat exchange uniformity of the heat exchange body 21 and meeting the temperature uniformity requirements of the battery cell assembly 10.

[0130] The heat exchanger body 21 is provided with multiple heat exchange channels 21a. At least some of the heat exchange channels 21a are open and used to fill the heat exchange medium. The inlet and outlet of the other part of the heat exchange channels 21a are blocked to prevent the heat exchange medium from entering, thereby reducing the total content of the heat exchange medium in the heat exchanger body 21 and thus reducing the weight of the heat exchange medium in the heat exchanger body 21. In addition, the heat exchange channels 21a in the heat exchanger body 21 that are not filled with heat exchange medium are hollow structures, which can effectively reduce the weight of the heat exchanger body 21 itself. Therefore, the overall weight of the heat exchanger 20 is reduced, thereby achieving the purpose of reducing the weight of the battery device 1 and improving the weight capacity density of the battery device 1.

[0131] Meanwhile, the above settings can reduce the heat exchange medium capacity in the heat exchanger 20 without changing the contact area between the heat exchange body 21 and the battery cell assembly 10, thereby increasing the weight capacity density of the battery device 1.

[0132] In some embodiments, the heat exchanger 20 includes a sealing member 50, which is disposed on the collector 23. The sealing member 50 is used to seal other structures on the collector 23 except for the connecting channel 23c and the flow-around hole 231b, so as to achieve the purpose of sealing part of the heat exchange channel 21a and reduce the difficulty of sealing the heat exchange channel 21a.

[0133] Of course, in other embodiments, the sealing member 50 may also be disposed between the transition part 22 and the heat exchange body 21, and the heat exchange channel 21a may be directly blocked by the sealing member 50, thereby reducing the difficulty of blocking the heat exchange channel 21a.

[0134] It should be noted that when the sealing element 50 is provided on the collector 23, the sealing element 50 is provided on the collector 23 at both ends of the heat exchange body 21; when the sealing element 50 is provided between the transition part 22 and the heat exchange body 21, the sealing element 50 is provided at both ends of the heat exchange body 21, so that the sealing element 50 can effectively block the heat exchange channel 21a, prevent the heat exchange medium from entering the blocked heat exchange channel 21a, and effectively reduce the weight of the heat exchanger 20.

[0135] Furthermore, when the sealing element 50 is located on the heat exchanger 23, the sealing element 50 and the heat exchanger 23 can be formed as a single piece, eliminating the need for a connection between the sealing element 50 and the heat exchanger 23, reducing the assembly difficulty of the sealing element 50, and increasing the connection strength between the sealing element 50 and the heat exchanger 23. This allows the sealing element 50 to be stably placed on the heat exchanger 23, thereby ensuring the working performance of the sealing element 50 to a certain extent. When the sealing element 50 is located inside the heat exchanger body 21, the heat exchanger 23 can be processed by injection molding, reducing the molding difficulty of the heat exchanger 23 and improving the structural stability of the heat exchanger 23, thereby ensuring the working performance of the heat exchanger 23 to a certain extent.

[0136] In some embodiments, the adapter 22 connects the sealing member 50 and the heat exchange body 21. That is, when the adapter 22 is located at one end of the heat exchange body 21, the adapter 22 connects both the sealing member 50 and the heat exchange body 21, so that the sealing member 50 and the heat exchange body 21 cooperate to support the adapter 22, thereby improving the positional stability of the adapter 22 and ensuring the working performance of the adapter 22 to a certain extent.

[0137] At the same time, by connecting the adapter 22 to the sealing member 50, the adapter 22 can also be used to support the sealing member 50, thereby improving the positional stability of the sealing member 50 and improving the sealing effect of the sealing member 50.

[0138] At least one heat exchange channel 21a is blocked by a sealing component 50. This prevents the heat exchange medium flowing through the collector 23 from entering part of the heat exchange channel 21a, effectively reducing the total content of the heat exchange medium in the heat exchange body 21, thereby reducing the weight of the heat exchange medium in the heat exchange body 21. Furthermore, the heat exchange channel 21a in the heat exchange body 21 that is not irrigated by the heat exchange medium is a cavity structure, which can effectively reduce the weight of the heat exchange body 21 itself. Therefore, the overall weight of the heat exchanger 20 is reduced, thereby achieving the goal of reducing the weight of the battery device 1 and improving the weight capacity density of the battery device 1.

[0139] It should also be noted that when the sealing element 50 is disposed in the heat exchange body 21 to block at least one heat exchange channel 21a, both ends of the heat exchange channel 21a are blocked by the sealing element 50; when the sealing element 50 is disposed on the collector 23 to block at least one branch port, the collector 23 located at both ends of the heat exchange body 21 is provided with the sealing element 50, so that the sealing element 50 can effectively block the heat exchange channel 21a, prevent the heat exchange medium from entering the blocked heat exchange channel 21a, and effectively reduce the weight of the heat exchanger 20.

[0140] In a specific example, when the sealing element 50 is located between the transition part 22 and the heat exchange body 21, during the assembly of the heat exchange body 21, the sealing element 50 can first be placed inside the heat exchange channel 21a (e.g., by using an external driving component to push the sealing element 50 into the heat exchange channel 21a) to achieve a mating connection between the sealing element 50 and the heat exchange channel 21a. After the sealing element 50 and the heat exchange channel 21a are assembled, the transition part 22 is then connected to both the sealing element 50 and the heat exchange body 21 to achieve... The adapter 22 is fixedly connected to the plugging component 50 and the heat exchange body 21. When the plugging component 50 is placed on the collector 23, during the assembly of the heat exchange body 21, the plugging component 50 can be placed on the collector 23 first. The plugging component 50 and the collector 23 can be welded, bonded, or integrally formed. After the plugging component 50 and the collector 23 are assembled, the adapter 22 is connected to the plugging component 50 and the heat exchange body 21 respectively to achieve a fixed connection between the adapter 22 and the plugging component 50 and the heat exchange body 21.

[0141] In the battery device 1 of this application embodiment, a heat exchanger 20 is provided, and the transition part 22 of the heat exchanger 20 is configured to include a transition channel 22a, and the transition channel 22a is configured to communicate with a heat exchange channel 21a. The branch port of the current collector 23 is also connected to the heat exchange channel 21a through the transition channel 22a. In this way, when the sealing member 50 is provided in the heat exchange body 21 to block at least one heat exchange channel 21a and / or the sealing member 50 is provided in the current collector 23 to block at least one branch port, the purpose of sealing the heat exchange channel 21a can be achieved by using the sealing member 50. This facilitates the prevention of heat exchange medium from entering at least part of the heat exchange channel 21a, thereby reducing the total content of heat exchange medium in the heat exchange body 21. Furthermore, the heat exchange channel 21a in the heat exchange body 21 that is not irrigated by heat exchange medium has a cavity structure, thereby reducing the weight of the heat exchange body 21 and improving the weight capacity density of the battery device 1.

[0142] The heat exchanger 20 of this application can reduce the heat exchange medium capacity within the heat exchanger 20 without changing the contact area with the battery cell assembly 10, thereby increasing the weight capacity density of the battery device 1.

[0143] In some embodiments, the sealing member 50 is disposed between the transition portion 22 and the heat exchange body 21. The transition portion 22 is then injection molded to cover the sealing member 50 and the heat exchange body 21, so that the transition portion 22, the sealing member 50, and the heat exchange body 21 form an integral part. This can be understood as follows: when the sealing member 50 is disposed between the transition portion 22 and the heat exchange body 21, during the assembly of the heat exchange body 21, the sealing member 50 and the heat exchange body 21 can be first processed and connected in place. Then, the transition portion 22 is integrally injection molded with the heat exchange body 21 and the sealing member 50, thereby achieving a secondary injection molding of the transition portion 22 to cover the sealing member 50 and the heat exchange body 21, achieving a cooperative connection between the transition portion 22, the heat exchange body 21, and the sealing member 50, and reducing the height of the transition portion 22 and the heat exchange body 21. While reducing the connection difficulty of the sealing component 50, it can also ensure the connection strength between the adapter 22 and the heat exchange body 21 and the sealing component 50 to a certain extent, so that the adapter 22 can be stably set at one end of the heat exchange body 21, thereby facilitating the connection between the adapter channel 22a and the heat exchange channel 21a, and making it easier to use the adapter 22 to achieve the connection between the heat exchange body 21 and the collector 23, reducing the difficulty of the connection between the heat exchange body 21 and the collector 23, and ensuring the working performance of the heat exchanger 20 to a certain extent.

[0144] In some embodiments, the adapter 22 includes an outer ring 224 and an adapter plate 225. The outer ring 224 is fitted over one end of the heat exchange body 21, and the adapter plate 225 is disposed within the outer ring 224. Multiple adapter channels 22a pass through the adapter plate 225. The outer ring 224 and / or the adapter plate 225 are then injection molded onto the heat exchange body 21. This means that when the adapter 22 is injection molded onto the heat exchange body 21, the outer ring 224 can be injection molded onto the heat exchange body 21; or, the adapter plate 225 can be injection molded onto the heat exchange body 21; or, both the outer ring 224 and the adapter plate 225 can be injection molded onto the heat exchange body 21 to achieve injection molding fit between the adapter 22 and the heat exchange body 21, thereby reducing the connection difficulty between the adapter 22 and the heat exchange body 21 and increasing the sealing performance and pressure resistance at the connection point between the adapter 22 and the heat exchange body 21.

[0145] In some embodiments, the outer ring 224 is fitted onto one end of the heat exchange body 21 and injection molded to fit the heat exchange body 21, and the adapter plate 225 is injection molded onto the sealing member 50. In this way, while realizing the injection molding fit between the adapter 22 and the heat exchange body 21 and the sealing member 50, the injection molding difficulty of the adapter 22 and the heat exchange body 21 and the sealing member 50 can be further reduced.

[0146] In a specific example, the outer ring 224 is fitted over the first region. While enabling the adapter 22 to be located at one end of the heat exchange body 21, it can also reduce the difficulty of connecting the adapter 22 and the heat exchange body 21 and improve the connection strength between the adapter 22 and the heat exchange body 21.

[0147] In some other embodiments, the sidewalls of the heat exchange channel 21a inside the heat exchange body 21 that do not require filling with cooling medium can also be roughened. When the transfer part 22 is injection molded, the transfer part 22 contacts the sidewalls of the heat exchange channel 21a inside the heat exchange body 21 that do not require filling with cooling medium. This can also achieve injection molding fit between the transfer part 22 and the heat exchange body 21 and improve the fit strength.

[0148] In other words, it is not limited to attaching the outer ring 224 to the heat exchange body 21.

[0149] In a specific example, the transition section 22 has a thin wall to form an outer ring 224, which is connected to one end of the heat exchange body 21. The area where the heat exchange medium needs to flow is set as a through hole 23c to form a transition channel 22a, and the other areas are solid to form a transition plate 225.

[0150] In some embodiments, the sealing member 50 seals within the heat exchange channel 21a, with a portion of the sealing member 50 extending beyond the heat exchange channel 21a, such that at least a portion of the sealing member 50 protrudes from the heat exchange channel 21a. This means that when the sealing member 50 is disposed within the heat exchange body 21 to seal the heat exchange channel 21a, the portion of the sealing member 50 extending beyond the heat exchange channel 21a facilitates the installation and removal of the sealing member 50, and also allows for the use of the transition portion 22 to fix the sealing member 50, further improving the positional stability of the sealing member 50 and, to a certain extent, ensuring the working performance of the sealing member 50.

[0151] In some embodiments, the adapter plate 225 is provided with a receiving groove for accommodating the sealing member 50. This allows the portion of the sealing member 50 extending out of the heat exchange channel 21a to be assembled into the receiving groove of the adapter plate 225, thereby fixing the sealing member 50 using the adapter plate 225, or fixing the sealing member 50 using the adapter portion 22, improving the positional stability of the sealing member 50, and ensuring the working performance of the sealing member 50 to a certain extent.

[0152] In summary, the adapter 22 of this application is designed to accommodate the sealing member 50. In this way, when the adapter 22 is injection molded onto the heat exchange body 21 for the second time, the adapter 22 can be connected to both the heat exchange body 21 and the sealing member 50 at the same time, thereby improving the positional stability of the sealing member 50 and achieving partial sealing of the heat exchange body 21.

[0153] In a specific example, during the assembly of the heat exchanger 20, the sealing element 50 can first be placed on the heat exchange body 21 (e.g., by using an external driving element to push the sealing element 50 into the heat exchange channel 21a). Then, the sealing element 50 and the heat exchange body 21 are integrally injection molded with the adapter 22 as inserts, and the adapter 22 is then injection molded to cover the sealing element 50 and the heat exchange body 21, so as to achieve the cooperative connection between the adapter 22, the sealing element 50, and the heat exchange body 21, thereby achieving the sealing of part of the heat exchange channel 21a of the heat exchange body 21 by using the sealing element 50.

[0154] In some embodiments, the sealing member 50 is formed as a block, which is conformed to the heat exchange channel 21a to be sealed. The block is fitted into the end of the heat exchange channel 21a to realize the sealing member 50 in the heat exchange body 21 to seal at least one heat exchange channel 21a and reduce the assembly difficulty of the sealing member 50.

[0155] The plug and the heat exchange channel 21a can be interference-fitted to increase the connection strength between the plug and the heat exchange channel 21a, so that the plug can be stably set in the heat exchange channel 21a, thereby improving the sealing effect of the plugging component 50.

[0156] It should be noted that the blockage mentioned here can be either a metal blockage or a plastic blockage.

[0157] In some embodiments, the contact length between the plug and the heat exchange channel 21a in the length direction of the heat exchange channel 21a is greater than 10 mm, so as to further increase the connection strength between the plug and the heat exchange channel 21a, so that the plug can be stably installed in the heat exchange channel 21a, thereby improving the sealing effect of the plugging member 50.

[0158] It should be noted that when multiple heat exchange channels 21a need to be blocked, multiple adjacent heat exchange channels 21a can be blocked. This makes it easier to block multiple heat exchange channels 21a at the same time using one blocking component 50, thereby reducing the difficulty of blocking multiple heat exchange channels 21a.

[0159] Of course, multiple sealing elements 50 can be provided, with each sealing element 50 corresponding to a different heat exchange channel 21a to be sealed. This allows the sealing elements 50 to be used to seal the heat exchange channel 21a. Alternatively, one sealing element 50 can be used to seal a portion of the heat exchange channel 21a.

[0160] Furthermore, when multiple sealing elements 50 are provided, adjacent sealing elements 50 can be independent of each other or connected in a cooperative manner.

[0161] In some embodiments, the heat exchanger body 21 is provided with a plurality of partition ribs 211 for separating a plurality of heat exchange channels 21a. This means that the heat exchanger body 21 is provided with a plurality of partition ribs 211, which are used to separate a plurality of heat exchange channels 21a within the heat exchanger body 21, thereby reducing the molding difficulty of the plurality of heat exchange channels 21a. Simultaneously, the plurality of partition ribs 211 can also support the heat exchanger body 21, facilitating the improvement of the structural strength and stability of the heat exchanger body 21, ensuring the working performance of the heat exchanger body 21 to a certain extent, and extending the service life of the heat exchanger body 21.

[0162] Optionally, the sealing member 50 is provided with at least one insertion slot 51, and at least one partition rib 211 is inserted into the insertion slot 51 so that the sealing member 50 is positioned in the heat exchange body 21 and blocks the heat exchange channel 21a. In this way, while realizing the sealing member 50 is placed in the heat exchange body 21 to block at least one heat exchange channel 21a, the difficulty of fitting the sealing member 50 and the heat exchange body 21 is reduced, and the fitting quality is improved, so that the sealing member 50 can be stably placed in the heat exchange channel 21a, thereby improving the sealing effect of the sealing member 50.

[0163] In some embodiments, the sidewall of the sealing member 50 is provided with a limiting protrusion 52, which is adapted to contact the end face of the partition rib 211 and / or the heat exchange body 21 to limit the length of the portion of the sealing member 50 located within the heat exchange channel 21a. This means that the limiting protrusion 52 contacts the end face of the partition rib 211; or, the limiting protrusion 52 contacts the end face of the heat exchange body 21; or, the limiting protrusion 52 contacts both the end face of the partition rib 211 and the heat exchange body 21, thereby limiting the length of the portion of the sealing member 50 located within the heat exchange channel 21a. This, to a certain extent, prevents the sealing member 50 from failing to seal the end opening of the heat exchange channel 21a, that is, to a certain extent, prevents some heat exchange medium from filling the end opening of the heat exchange channel 21a, thereby improving the sealing effect of the sealing member 50 and helping to reduce the weight of the heat exchanger 20.

[0164] In some embodiments, the limiting protrusion 52 contacts the adapter plate 225 to achieve contact and cooperation between the sealing member 50 and the adapter 22, so as to facilitate the use of the adapter 22 to support the sealing member 50, improve the positional stability of the sealing member 50, and ensure the sealing effect of the sealing member 50 to a certain extent.

[0165] In some embodiments, the height of the collection ports 23a of the collectors 23 at both ends of the heat exchange body 21 is the same. This facilitates the connection of the collection ports 23a at both ends of the heat exchange body 21 with external components, reduces connection difficulty, and makes it easier to transport the heat exchange medium toward the heat exchange body 21 through the collection ports 23a, or to output the heat exchange medium inside the heat exchange body 21 through the collection ports 23a, so that the heat exchange medium can flow effectively inside the heat exchange body 21, and to a certain extent ensures the heat exchange effect of the heat exchange body 21.

[0166] In some embodiments, when the heat exchanger 20 is applied to the battery device 1, the surface of the heat exchange body 21 perpendicular to its thickness direction can be used to contact the battery cell assembly 10 in order to achieve heat exchange between the heat exchanger 20 and the battery cell assembly 10.

[0167] Meanwhile, the heat exchange body 21 can also provide stable support, constraint and anti-deformation effect for the battery cell assembly 10.

[0168] In some embodiments, the battery device 1 includes a plurality of battery cell assemblies 10 and a plurality of heat exchangers 20. The plurality of battery cell assemblies 10 are arranged in multiple rows, with each row of battery cell assemblies 10 disposed between two adjacent heat exchangers 20. This allows for simultaneous heat exchange between two heat exchangers 20 on the battery cell assemblies 10, ensuring the heat exchange effect of the heat exchangers 20 to a certain extent. This maintains the temperature of the battery cell assemblies 10 within a suitable temperature range, extends the service life of the battery cell assemblies 10, and improves the safety of the battery cell assemblies 10 in use.

[0169] Optionally, the two sides of the battery cell assembly 10 are respectively abutted against two adjacent heat exchangers 20, so that heat can be exchanged on both sides of the battery cell assembly 10, further improving the heat exchange effect of the battery cell assembly 10. At the same time, multiple battery cell assemblies 10 and multiple heat exchangers 20 can mutually abut and support each other, thereby improving the positional stability of multiple battery cell assemblies 10 and multiple heat exchangers 20, and thus ensuring the structural stability of the battery device 1 to a certain extent and improving the working performance of the battery device 1.

[0170] In some embodiments, the battery device 1 further includes a connecting pipe for connecting adjacent heat exchangers 20, thereby enabling the simultaneous delivery of heat exchange medium to multiple heat exchangers 20 and reducing the difficulty of circulating the heat exchange medium within multiple heat exchangers 20.

[0171] The structure of the connecting pipe is not limited; it can be a single pipe or a combination of multiple pipes.

[0172] According to some embodiments of this application, such as Figure 2 As shown, the battery device 1 also includes a housing 30, with the heat exchanger 20 and battery cells all housed within the housing 30. The heat exchanger 20 and the housing 30 are connected at the same potential. Specifically, the battery device 1 generally includes a housing 30 for encapsulating multiple battery cell assemblies 10 or multiple battery cells. The housing 30 can, to a certain extent, prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells. The heat exchanger 20 is located within the housing 30 and is configured to exchange heat with the battery cell assembly 10. This allows the heat exchanger body 21 to adjust the temperature of the battery cell assembly 10, maintaining its temperature within a suitable range. This extends the lifespan of the battery cell assembly 10 and also improves its safety during use.

[0173] The battery device 1 generally includes a housing 30 for encapsulating multiple battery cell assemblies 10 or multiple battery cells. The housing 30 can, to a certain extent, prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells. The battery cell assemblies 10 are disposed within the housing 30. This allows the housing 30 to support and protect the battery cell assemblies 10, improving the structural stability of the battery cell assemblies 10, extending their service life, and enhancing their safety during use.

[0174] In some embodiments, the housing 30 may include a first portion 31 and a second portion 32, which overlap each other. The first portion 31 and the second portion 32 together define a receiving cavity for accommodating the battery cell assembly 10 and the heat exchanger 20, thereby reducing the molding difficulty of the housing 30.

[0175] The first part 31 can be a hollow structure with one end open, and the second part 32 can be a plate-like structure. The second part 32 covers the open side of the first part 31 so that the first part 31 and the second part 32 together define the receiving cavity; or, the second part 32 can be a hollow structure with one end open, and the first part 31 can be a plate-like structure. The first part 31 covers the open side of the second part 32, so that the first part 31 and the second part 32 can also cooperate to define the receiving cavity; or, the first part 31 and the second part 32 are both hollow structures with one side open, and the open side of the first part 31 covers the open side of the second part 32 to define the receiving cavity. The box 30 formed by the first part 31 and the second part 32 can be of various shapes, such as a cylinder, a cube, or a cuboid.

[0176] Of course, in some other embodiments of this application, the battery device 1 may not include the housing 30, but only the battery cell assembly 10 and the heat exchange body 21, which will not be elaborated here.

[0177] According to some embodiments of this application, the battery device 1 further includes a first conductive element and a second conductive element 42. The first conductive element is fixed to the inner wall of the housing 30, and the second conductive element 42 is fixed to the current collector 23 and / or the adapter 22 and electrically connected to the heat exchange body 21. Here, the first conductive element and the second conductive element 42 connect the heat exchange body 21 and the housing 30 at the same potential, and the housing 30 can, to a certain extent, prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0178] In some embodiments, the current collector 23 and / or the adapter 22 are provided with a snap-fit ​​portion in the width direction of the heat exchange body 21. The snap-fit ​​portion is adapted to snap-fit ​​the second conductive member 42 to fix the second conductive member 42 on the heat exchanger 20, so as to facilitate the electrical connection between the second conductive member 42 and the heat exchange body 21.

[0179] According to some embodiments of this application, such as Figure 6 As shown, the second conductive element 42 and the adapter 22 are plugged into each other. Specifically, the plugging method is simple and easy to implement. The adapter 22 is provided with a snap-fit ​​part in the width direction of the heat exchange body 21. The snap-fit ​​part is suitable for plugging into the second conductive element 42 to fix the second conductive element 42 on the heat exchanger 20, so as to facilitate the electrical connection between the second conductive element 42 and the heat exchange body 21.

[0180] According to some embodiments of this application, such as Figure 6As shown, the adapter 22 has a slot 222 and a limiting protrusion 223 in the slot 222. The second conductive member 42 has a limiting hole 42a. The second conductive member 42 is inserted into the slot 222, and the limiting protrusion 223 and the limiting hole 42a cooperate. Specifically, the adapter 22 has a slot 222 and a limiting protrusion 223. The second conductive member 42 is inserted through the slot 222 on the adapter 22. When it is inserted to a certain depth, the limiting hole 42a on the second conductive member 42 is exactly aligned with the limiting hole 42a on the adapter 22, thus realizing the insertion and cooperation of the adapter 22 with the second conductive member 42, thereby limiting the second conductive member 42.

[0181] The following is a brief description of the electrical equipment 1000 according to this application.

[0182] In the technical solution of this application embodiment, by using the battery device 1 described in the above embodiment, the battery life of the electrical device 1000 can be guaranteed to a certain extent, and the size of the electrical device 1000 can be reduced.

[0183] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0184] Although embodiments of this application have been shown and described above, variations, modifications, substitutions and alterations can be made to the above embodiments.

Claims

1. A battery device (1), characterized in that, Includes a battery cell assembly (10) and a heat exchanger (20), the heat exchanger (20) exchanging heat with the battery cell assembly (10), the heat exchanger (20) comprising: A heat exchange body (21) is provided with a heat exchange channel (21a) inside the heat exchange body (21), and at least one end of the heat exchange body (21) is open to form an opening; The adapter (22) is fixed to the end of the heat exchange body (21), and the end face of the adapter (22) facing away from the heat exchange body (21) is provided with a protruding first welding protrusion (221). The current collector (23) is provided with a collection port (23a). The current collector (23) is fixed to the end of the adapter (22) to close the opening. The collection port (23a) is connected to the heat exchange channel (21a). The end face of the current collector (23) facing the adapter (22) is provided with a second welding protrusion (231) protruding towards the adapter (22). The first welding protrusion (221) and the second welding protrusion (231) are in contact with each other's end faces. The outer peripheral walls of the first welding protrusion (221) and the second welding protrusion (231) are provided with welding areas.

2. The battery device (1) according to claim 1, characterized in that, In the thickness direction of the heat exchange body (21), the thickness of the second welding protrusion (231) ranges from 1 to 10 mm.

3. The battery device (1) according to claim 1, characterized in that, The minimum distance between the outer peripheral wall of the second welding protrusion (231) and the outer peripheral edge of the current collector (23) is in the range of 0.5-5mm.

4. The battery device (1) according to claim 1, characterized in that, In the thickness direction of the heat exchange body (21), the distance between the outer peripheral wall of the second welding protrusion (231) and the outer peripheral edge of the current collector (23) is the first distance; In the width direction of the heat exchange body (21), the minimum distance between the outer peripheral wall of the second weld protrusion (231) and the outer peripheral edge of the current collector (23) is the second distance, which is different from the first distance and the second distance.

5. The battery device (1) according to claim 4, characterized in that, The first distance is less than the second distance.

6. The battery device (1) according to claim 1, characterized in that, The adapter (22) is fitted onto the heat exchange body (21).

7. The battery device (1) according to claim 6, characterized in that, The heat exchange body (21) is a metal part, and the adapter (22) is injection molded onto the heat exchange body (21) and formed into a single piece with the heat exchange body (21).

8. The battery device (1) according to any one of claims 1-7, characterized in that, The heat exchange body (21) is provided with multiple heat exchange channels (21a), and the connecting part (22) is provided with multiple connecting channels (22a); The collector (23) is provided with at least one flow guide channel (23b), the collection port (23a) is connected to at least one of the heat exchange channels (21a), and at least two of the heat exchange channels (21a) are connected through the flow guide channel (23b) and the transition channel (22a) to define a heat exchange loop (242) having at least one bend (241).

9. The battery device (1) according to claim 8, characterized in that, The plurality of the transfer channels (22a) and the plurality of the heat exchange channels (21a) are connected in a one-to-one correspondence, and the flow guide channel (23b) is connected in a corresponding manner to at least two of the transfer channels (22a) so that at least two of the heat exchange channels (21a) are connected through the flow guide channel (23b) to define the heat exchange circuit (242) having at least one of the bends (241).

10. The battery device (1) according to claim 9, characterized in that, The heat exchange body (21) is provided with the transition part (22) and the collector (23) at both ends; each collector (23) includes a connecting channel (23c) connected to the collection port (23a), the guide channel (23b) is independent and not connected to the connecting channel (23c), and each guide channel (23b) is provided with two flow holes (231b) spaced apart; The communication channel (23c) of each of the current collectors (23) is connected to one of the heat exchange channels (21a) via the transition channel (22a); Each of the flow channels (23b) of each of the current collectors (23) is connected to two of the heat exchange channels (21a) through two flow holes (231b) so that the two heat exchange channels (21a) are connected and the bend (241) is formed between the heat exchange channel (21a) and the flow channel (23b).

11. The battery device (1) according to claim 1, characterized in that, It also includes a housing (30), in which the heat exchanger (20) and the battery cell are both located, and the heat exchanger (20) and the housing (30) are connected at the same potential.

12. The battery device (1) according to claim 11, characterized in that, It also includes a first conductive element and a second conductive element (42), the first conductive element being fixed to the inner wall of the housing (30), the second conductive element (42) being fixed to the current collector (23) and / or the adapter (22) and electrically connected to the heat exchange body (21), and the first conductive element and the second conductive element (42) being electrically connected.

13. The battery device (1) according to claim 12, characterized in that, The second conductive element (42) and the adapter (22) are inserted into each other.

14. The battery device (1) according to claim 13, characterized in that, The adapter (22) is provided with a slot (222) and a limiting protrusion (223) provided in the slot (222). The second conductive member (42) is provided with a limiting hole (42a). The second conductive member (42) is inserted into the slot (222) and the limiting protrusion (223) and the limiting hole (42a) cooperate.

15. An electrical appliance, characterized in that, Includes a battery device (1) according to any one of claims 1-14, said battery device (1) being used to provide electrical energy.

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