Battery device and electric device having the same

Abstract

This application discloses a battery device and an electrical device having the same. The battery device includes: a housing with a flow channel space for circulating a heat exchange medium; a first side plate with an inlet chamber and an isolation chamber within it; the isolation chamber being located on the side of the inlet chamber facing the flow channel space; the inlet chamber having an inlet and a first branch port communicating with the isolation chamber; and the isolation chamber having a second branch port communicating with the flow channel space. The inlet is connected to the inlet chamber and is used to input the heat exchange medium into the inlet chamber. A battery cell is also disclosed, with at least a portion of the battery cell disposed within the flow channel space. The battery device according to this application can reduce the possibility of a temperature gradient before the heat exchange medium contacts the battery cell, enabling the heat exchange medium to uniformly cool the battery cells within the flow channel space when cooling multiple battery cells, thus reducing the possibility of uneven heat dissipation and large temperature differences among the battery cells within the flow channel space.

Description

Technical Field

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

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

[0003] The battery device in the related technology includes multiple battery cells arranged in a flow channel space. In order to dissipate heat from the battery cells, a heat exchange medium can flow in the flow channel space. When the heat exchange medium flows, it can carry away the heat generated by the battery cells, thus achieving heat dissipation. However, since the flow channel space has a certain length, the cooling effect of the heat exchange medium on the battery cells is better when it first flows along the flow channel space.

[0004] However, the heat exchange medium absorbs heat from the flow channel during the flow process, causing the temperature of the heat exchange medium to gradually rise. When the heat exchange medium flows to the rear part of the flow channel, the cooling effect of the heat exchange medium on the battery cells becomes worse, which results in poor uniformity of the heat exchange medium when cooling multiple battery cells.

[0005] Application content

[0006] In view of the above problems, this application provides a battery device and an electrical device having the same, which can reduce the possibility of temperature gradients occurring before the heat exchange medium comes into contact with the battery cells, and enable the heat exchange medium to uniformly cool the battery cells in the flow channel space when cooling multiple battery cells, thereby reducing the possibility of uneven heat dissipation and large temperature differences among the battery cells in the flow channel space.

[0007] In a first aspect, this application proposes a battery device, comprising: a housing, wherein the housing has a flow channel space for circulating a heat exchange medium, the housing has a first side plate, the first side plate has a liquid inlet chamber and an isolation chamber, the isolation chamber is located on the side of the liquid inlet chamber facing the flow channel space, the liquid inlet chamber has a liquid inlet and a first branch port communicating with the isolation chamber, the isolation chamber has a second branch port communicating with the flow channel space, the liquid inlet is communicating with the liquid inlet chamber, and the liquid inlet is used to input a heat exchange medium into the liquid inlet chamber; and a battery cell, at least a portion of the battery cell being disposed within the flow channel space.

[0008] In the technical solution of this application embodiment, by providing an inlet cavity and an isolation cavity in the first side plate, and positioning the isolation cavity on the side of the inlet cavity facing the flow channel space, the inlet cavity and the flow channel space are separated by the isolation cavity. In this way, when the heat exchange medium enters the inlet cavity through the inlet, the influence of the heat in the flow channel space on the heat exchange medium in the inlet cavity can be reduced, and the possibility that the heat exchange medium will absorb the heat in the flow channel space before entering the flow channel space can be reduced, thereby ensuring the temperature uniformity of the heat exchange medium, solving the problem of large temperature gradient when the heat exchange medium flows in the flow channel space, and improving the uniformity of the heat exchange medium when cooling the battery cells.

[0009] In some embodiments, the flow channel space is provided with a plurality of battery cells arranged sequentially along a first direction, the first side plate is located on one side of the flow channel space along a second direction, and both the first side plate and the liquid inlet cavity extend along the first direction, and the isolation cavity is located between the liquid inlet cavity and the flow channel space.

[0010] In the technical solution of this application embodiment, by arranging multiple battery cells along a first direction in the flow channel space, the heat exchange medium first enters the liquid inlet cavity through the liquid inlet. After storing a certain amount of heat exchange medium in the liquid inlet cavity, the heat exchange medium enters the isolation cavity through the first branch port, and the heat exchange medium in the isolation cavity enters the flow channel space through the second branch port. This facilitates the entry of a large amount of heat exchange medium into the flow channel space in a short time, so as to use the heat exchange medium to quickly cool multiple battery cells and solve the problem of temperature gradient when the heat exchange medium cools multiple battery cells.

[0011] In some embodiments, in the first direction, a spacer cavity is defined between adjacent battery cells, the spacer cavity being part of the flow channel space.

[0012] In the technical solution of this application embodiment, by defining a spacer cavity between two adjacent battery cells, the heat exchange medium in the flow channel space can enter the spacer cavity. This facilitates increasing the contact area between the battery cell and the heat exchange medium, thereby improving the cooling efficiency of the battery cell and enhancing the cooling effect of the battery cell.

[0013] In some embodiments, in the first direction, there are multiple second shunt ports, and the multiple second shunt ports and the multiple battery cells are arranged in a one-to-one correspondence.

[0014] In the technical solution of this application embodiment, by setting multiple second diversion ports and multiple battery cells in a one-to-one correspondence, it is ensured that when the heat exchange medium in the isolation cavity flows to the battery cells through the multiple second diversion ports, a portion of the heat exchange medium flowing to the battery cells through the second diversion ports can contact the multiple battery cells and absorb the heat generated by the battery cells. This ensures that the heat exchange medium does not come into contact with other heat sources before cooling the multiple battery cells. Thus, when cooling the multiple battery cells with the heat exchange medium, the temperature gradient problem of the heat exchange medium is solved, and the temperature difference of the heat exchange medium is small. This allows for uniform cooling of multiple battery cells in the same flow channel space, reducing the possibility of a large temperature difference between multiple battery cells.

[0015] In some embodiments, in the first direction, there are multiple second diversion ports, and the multiple second diversion ports are configured in a one-to-one correspondence with the multiple spacer cavities.

[0016] In the technical solution of this application embodiment, by setting multiple second diversion ports one-to-one with multiple spacer cavities, it is ensured that when the heat exchange medium in the spacer cavity flows into the spacer cavity through the multiple second diversion ports one-to-one, the part of the heat exchange medium flowing into the spacer cavity through the second diversion ports can contact the sidewall with a larger area in the first direction of multiple battery cells and absorb the heat generated by the battery cells. This ensures that the heat exchange medium does not come into contact with other heat sources before cooling multiple battery cells, thus solving the temperature gradient problem of the heat exchange medium and making the temperature difference of the heat exchange medium smaller. This allows for uniform cooling of multiple battery cells in the same flow channel space, reducing the possibility of a large temperature difference between multiple battery cells.

[0017] In some embodiments, the isolation cavity is an elongated strip extending along the first direction, and the isolation cavity is provided with a plurality of first diversion ports and a plurality of second diversion ports arranged at intervals along the first direction.

[0018] In the technical solution of this application embodiment, by adapting the extension direction of the isolation cavity to the arrangement of multiple battery cells, when the heat exchange medium flows into the flow channel space through multiple second diversion ports, the heat exchange medium in each part of the first direction in the isolation cavity can simultaneously flow into the flow channel space, thus solving the temperature gradient problem of the heat exchange medium, making the temperature difference of the heat exchange medium smaller, and thus ensuring that the heat exchange medium can uniformly cool multiple battery cells.

[0019] In some embodiments, there are multiple isolation cavities arranged along the first direction, and each isolation cavity is provided with the first diversion port and the second diversion port.

[0020] In the technical solution of this application embodiment, by setting multiple isolation cavities, the liquid inlet cavity and the flow channel space are fully separated, thereby significantly reducing the impact of heat in the flow channel space on the liquid inlet cavity, solving the temperature gradient problem of the heat exchange medium, making the temperature difference of the heat exchange medium smaller, and thus ensuring that the heat exchange medium can uniformly cool multiple battery cells.

[0021] In some embodiments, the spacer cavity is provided with a flow guiding component for changing the flow direction of at least a portion of the heat exchange medium.

[0022] In the technical solution of this application embodiment, by changing the flow direction of at least part of the heat exchange medium, at least part of the heat exchange medium can flow along a preset direction, thereby enabling the heat exchange medium to make as much complete contact as possible with the sidewall of the battery cell with a larger area in the first direction. This achieves sufficient cooling of the battery cell before it flows out along a preset path, which facilitates improving the cooling effect of the heat exchange medium on the battery cell.

[0023] In some embodiments, each of the spacer cavities is provided with a second diversion port and a liquid outlet channel. The heat exchange medium is adapted to enter the spacer cavity from the second diversion port and flow out from the liquid outlet channel to carry away the heat in the spacer cavity and achieve cooling of the battery cells.

[0024] In some embodiments, the flow guiding component is configured to define a guiding channel that communicates with the second diversion port and the liquid outlet channel for guiding the heat exchange medium from the second diversion port to the liquid outlet channel.

[0025] In the technical solution of this application embodiment, the flow direction of the heat exchange medium is guided by a flow guiding component, causing the heat exchange medium to flow in a preset direction. This ensures that the heat exchange medium can contact the largest surface area of ​​the battery cell as much as possible, improving the heat exchange effect on the battery cell. Then, the heat exchange medium is guided to flow out from the outlet channel, allowing it to carry away heat from the battery cell and achieve heat dissipation.

[0026] In some embodiments, the flow guiding component is foam adhered to the battery cell. The foam has the characteristic of rapid pressure-sensitive fixation, facilitating the quick and easy installation of the flow guiding component in the desired location.

[0027] In some embodiments, in the second direction, the isolation chamber is located on the side of the inlet chamber facing the flow channel space, the first diversion port and the second diversion port are offset in the second direction and / or the first diversion port is located in the middle of the isolation chamber and the second diversion port is located at the bottom of the isolation chamber; and / or the opening area of ​​the second diversion port is larger than the opening area of ​​the first diversion port; and / or the inlet chamber and the isolation chamber are located in the middle of the first side plate.

[0028] In the above technical solution, by staggering the first branch port and the liquid inlet in the second direction, the heat exchange medium is better retained in the isolation cavity, thereby improving the heat insulation effect in the isolation cavity, reducing the impact of heat in the flow channel space on the heat exchange medium, and improving the overall strength of the first side plate. Specifically, since drilling holes in the first side plate would reduce its structural strength, staggering the positions of the holes ensures that the structural strength of the first side plate is maintained while drilling.

[0029] In the technical solution of this application embodiment, by staggering the first diversion port and the second diversion port, the overall structural strength of the first side plate is improved. Specifically, since drilling holes in the first side plate would reduce its structural strength, by staggering the positions of the holes, the structural strength of the first side plate can be maintained while drilling.

[0030] In the technical solution of this application embodiment, by setting the first diversion port in the middle of the isolation cavity, the heat exchange medium will only enter the isolation cavity when the liquid level of the heat exchange medium in the inlet cavity exceeds the first diversion port. This allows a certain amount of heat exchange medium to be stored in the inlet cavity, which facilitates the entry of a large amount of heat exchange medium into the flow channel space in a short time, so as to use the heat exchange medium to quickly cool multiple battery cells and reduce the possibility of temperature gradient before the heat exchange medium comes into contact with the battery cells.

[0031] In the technical solution of this application embodiment, by setting the second diversion port at a higher position, the isolation cavity is filled with heat exchange medium, thereby facilitating the heat insulation effect of the isolation cavity and reducing the impact of heat in the flow channel space on the heat exchange medium in the liquid inlet cavity.

[0032] In the technical solution of this application embodiment, by making the opening area of ​​the second branch port larger than that of the first branch port, the heat exchange medium in the isolation cavity can quickly enter the flow channel space, thereby controlling the residence time of the heat exchange medium in the isolation cavity, reducing the impact of heat in the flow channel space on the heat exchange medium in the isolation cavity, and reducing the possibility of a temperature gradient appearing in the heat exchange medium before contacting the battery cell.

[0033] In the technical solution of this application embodiment, by setting the liquid inlet chamber and the isolation chamber in the middle of the first side plate, it is beneficial to increase the pressure at the liquid inlet, thereby improving the flow efficiency of the heat exchange medium.

[0034] Specifically, compared to constructing the liquid inlet cavity and the isolation cavity as a whole on the first side plate, constructing the liquid inlet cavity and the isolation cavity in the middle of the first side plate in the height direction is beneficial to reducing the area of ​​the liquid inlet cavity and the isolation cavity. This is beneficial to increasing the pressure of the heat exchange medium flowing into the liquid inlet cavity, and further beneficial to increasing the pressure of the heat exchange medium flowing to the liquid inlet, thereby improving the flow efficiency of the heat exchange medium. This is beneficial to reducing the risk of low flow efficiency of the heat exchange medium due to insufficient pressure caused by an excessively large area of ​​the liquid inlet cavity, thereby improving the heat exchange efficiency of the heat exchange medium to the battery cells.

[0035] In some embodiments, the housing is provided with a plurality of flow channel spaces, each of which is provided with a single battery cell, and at least a portion of the flow channel spaces are provided with an isolation cavity.

[0036] In the technical solution of this application embodiment, by providing an isolation cavity for at least a portion of the flow channel space, the flow channel space and the liquid inlet cavity are separated by the isolation cavity. In this way, when the heat exchange medium enters the liquid inlet cavity through the liquid inlet, the influence of the heat in the flow channel space on the heat exchange medium in the liquid inlet cavity can be reduced. The possibility that the heat exchange medium will absorb the heat in the flow channel space before entering the flow channel space is reduced, thereby reducing the possibility of a temperature gradient appearing in the heat exchange medium before contacting the battery cell, and ensuring the uniformity of the heat exchange medium when cooling multiple battery cells in the flow channel space.

[0037] In some embodiments, at least two adjacent flow channel spaces are spaced apart by the first side plate, and isolation cavities are provided on both sides of the liquid inlet cavity. This utilizes two isolation cavities to separate the liquid inlet cavity from the flow channel spaces located on both sides of the liquid inlet cavity, thereby significantly reducing the impact of heat from the flow channel spaces on the heat exchange medium within the liquid inlet cavity. This reduces the likelihood of a temperature gradient occurring in the heat exchange medium before it contacts the battery cells, ensuring the uniformity of the heat exchange medium when cooling multiple battery cells within the flow channel spaces.

[0038] In some embodiments, the housing further includes a second side plate for defining the flow channel space. The second side plate has a liquid outlet cavity and a liquid outlet channel communicating with the liquid outlet cavity and the flow channel space. The heat exchange medium in the flow channel space is adapted to enter the liquid outlet cavity through the liquid outlet channel so that the heat exchange medium can carry away the heat in the flow channel space when flowing out of the flow channel space, thereby achieving cooling of the battery cells in the flow channel space.

[0039] In some embodiments, the first side plate and the second side plate are disposed opposite to each other. The heat exchange medium in the inlet chamber is adapted to enter the isolation chamber through the first branch port, and the heat exchange medium in the isolation chamber enters the flow channel space through the second branch port. The heat exchange medium entering the flow channel space is adapted to exchange heat with the battery cells, and then the heat exchange medium enters the outlet chamber through the outlet channel to remove heat from the battery cells in the flow channel space, thereby achieving cooling of the battery cells.

[0040] In some embodiments, at least two adjacent flow channels are spaced apart by the second side plate. This facilitates improved utilization of the liquid outlet channel.

[0041] In some embodiments, a plurality of flow channel spaces are arranged sequentially in a second direction, and the first side plate and the second side plate are staggered in the second direction. The first side plate and the second side plate form two opposing sidewalls of the flow channel space in the second direction, so that each flow channel space is connected to the liquid inlet chamber and the liquid outlet chamber, thereby enabling the heat exchange medium to flow out of the flow channel space after entering the flow channel space, thereby achieving cooling of the battery cell.

[0042] Secondly, this application also proposes an electrical device that includes the battery device in the above embodiments, the battery device being used to store or provide electrical energy.

[0043] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0044] 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:

[0045] Figure 1 This is a structural schematic diagram of a vehicle provided according to some embodiments;

[0046] Figure 2 This is a schematic diagram of the structure of a battery device according to some embodiments;

[0047] Figure 3 This is a top view of a battery device provided according to some embodiments;

[0048] Figure 4 A cross-sectional view of a battery device provided according to some embodiments;

[0049] Figure 5 for Figure 4 Enlarged view of the central area;

[0050] Figure 6 This is a structural schematic diagram of a first side plate according to some embodiments;

[0051] Figure 7 for Figure 6 Enlarged view of the central area;

[0052] Figure 8 This is a schematic diagram of the structure of a battery device according to some other embodiments;

[0053] Figure 9 A cross-sectional view of a battery device provided according to other embodiments;

[0054] Figure 10 for Figure 9 A magnified view of the central area.

[0055] Reference numerals: 1000, vehicle; 100, battery device; 200, controller; 300, motor;

[0056] 10. Box body; 11. Flow channel space;

[0057] 20. First side plate; 21. Liquid inlet chamber; 22. Isolation chamber;

[0058] 251. First branch port; 252. Second branch port; 253. Liquid inlet;

[0059] 30. Battery cell; 35. Spacer cavity;

[0060] 40. Flow guiding component; 41. Guide channel; 411. First guide channel; 412. Second guide channel; 413. Third guide channel; 414. Fourth guide channel; 42. Flow guiding protrusion;

[0061] 50. Second side plate; 51. Liquid outlet chamber; 511. Liquid outlet;

[0062] 61. First flow channel; 62. Second flow channel; 63. Third flow channel. Detailed Implementation

[0063] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0065] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0066] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0067] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0068] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0069] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0070] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0071] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0072] The power battery mentioned here refers to a single physical module comprising multiple battery cells to provide higher voltage and capacity. For example, the power battery mentioned in this application can be a battery module or a battery pack. A battery module generally comprises multiple battery cells. A battery pack generally includes a housing for encapsulating multiple battery cells or multiple battery modules, the housing preventing liquids or other foreign matter from affecting the charging or discharging of the battery cells; of course, the battery may also not include a housing.

[0073] For example, a power battery includes a housing and multiple battery cells. The housing defines a flow channel space, and the multiple battery cells are arranged in the flow channel space. During the charging and discharging cycle of the battery cells, the battery cells will generate heat. If the battery cells cannot be cooled in time and quickly, the temperature of the environment in which the battery cells are located will become higher and higher. On the one hand, this can easily cause safety hazards such as fire. On the other hand, the working efficiency of the battery cells in a high-temperature environment is relatively low, which affects the normal operation of the battery cells.

[0074] To dissipate heat from individual battery cells, a heat exchange medium can be allowed to flow within the flow channel. As the heat exchange medium flows, it can carry away the heat generated by the individual battery cells, thus achieving heat dissipation. However, since the flow channel has a certain length, the cooling effect on the individual battery cells is better when the heat exchange medium initially flows along the flow channel.

[0075] However, the heat exchange medium absorbs heat from the flow channel space during the flow process, causing the temperature of the heat exchange medium to gradually rise. When the heat exchange medium flows to the rear part of the flow channel space, the cooling effect of the heat exchange medium on the battery cells becomes worse, which results in poor uniformity of heat dissipation of the heat exchange medium on multiple battery cells.

[0076] Specifically, this is illustrated using multiple battery cells arranged along a first direction within a flow channel space. The flow channel space in the housing is arranged along the first direction, and the heat exchange medium is suitable for flowing within the flow channel space along the first direction. When the heat exchange medium first enters the flow channel space, it can effectively reduce the temperature of the battery cells in the front part of the flow channel space. However, as the heat exchange medium flows within the flow channel space, its own temperature increases due to the absorption of heat. Therefore, when the heat exchange medium cools the battery cells in the rear part of the flow channel space, the cooling effect is poor.

[0077] This results in a situation where, after cooling the battery cells arranged along the first direction within the flow channel space, the temperature of the cells at the front is lower, while the temperature of the cells at the back is higher, leading to a significant temperature difference among the multiple battery cells within the flow channel space. This problem arises primarily because the heat exchange medium needs to flow along the first direction within the flow channel space, and the temperature of the heat exchange medium gradually increases during this flow, creating a temperature gradient. This results in poor uniformity in the cooling of the multiple battery cells within the flow channel space by the heat exchange medium.

[0078] To address the issue of temperature gradients in the heat exchange medium when cooling individual battery cells, an inlet chamber and an isolation chamber can be installed on the housing. The isolation chamber separates the flow channel space from the inlet chamber, allowing the heat exchange medium to first enter the inlet chamber. Once sufficient heat exchange medium has been stored in the inlet chamber, it flows through the isolation chamber into the flow channel space, directly dissipating heat from multiple battery cells within the flow channel space. This effectively solves the temperature gradient problem when the heat exchange medium flows within the flow channel space, resulting in a smaller temperature difference as the heat exchange medium flows through the flow channel space.

[0079] By setting up an isolation chamber to separate the liquid inlet chamber and the flow channel space, the possibility of heat generated by the battery cells in the flow channel space reaching the liquid inlet chamber can be reduced when the refrigerant enters the liquid inlet chamber. This ensures that the temperature difference of the heat exchange medium in different areas of the liquid inlet chamber is small in the first direction before the heat exchange medium enters the isolation chamber.

[0080] Specifically, taking the example of multiple battery cells arranged along the first direction in the flow channel space, and the flow channel space, the isolation chamber, and the liquid inlet chamber arranged sequentially along the second direction, after sufficient heat exchange medium is stored in the liquid inlet chamber, the heat exchange medium flows into the isolation chamber and the flow channel space along the second direction. This eliminates the need for the heat exchange medium to flow along the first direction in the flow channel space, thus solving the problem of temperature gradient when the heat exchange medium flows in the flow channel space. This allows the heat exchange medium to dissipate heat evenly to the multiple battery cells in the flow channel space, reducing the possibility of large temperature differences between battery cells in different areas of the housing.

[0081] The battery cells disclosed in this application can be used in electrical devices that use batteries as a power source or in various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. 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, etc.

[0082] For example, a battery cell typically includes a housing, an electrode assembly, and an electrolyte. The housing is used to contain the electrode assembly and the electrolyte, and the housing has at least one positive electrode post and at least one negative electrode post. The electrode assembly includes one or more electrode assemblies, which are formed by stacking or winding positive electrode plates, negative electrode plates, and separators.

[0083] The positive electrode generally includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector. The positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as a positive electrode tab. Multiple positive electrode tabs are stacked together and form an electrical connection with 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 electrode assembly can also include a positive electrode adapter piece. The multiple stacked positive electrode tabs are welded to one end of the positive electrode adapter piece, and the other end of the positive electrode adapter piece is welded to the positive electrode post, so that the positive electrode tabs and the positive electrode post form an electrical connection.

[0084] The negative electrode generally includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector. The negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as a negative electrode tab. Multiple negative electrode tabs are stacked together and form an electrical connection with 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 electrode assembly may also include a negative electrode adapter piece. The stacked negative electrode tabs are welded to one end of the negative electrode adapter piece, and the other end of the negative electrode adapter piece is welded to the negative electrode post, so that the negative electrode tabs and the negative electrode post form an electrical connection. The material of the separator is not limited; for example, it can be polypropylene or polyethylene.

[0085] For ease of explanation, the following embodiments use a vehicle as an example to describe the structure of the electrical device and battery device of this application in detail.

[0086] Please refer to Figure 1 , Figure 1 This is a structural schematic diagram of a vehicle 1000 according to some embodiments. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0087] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0088] Please refer to Figure 2 , Figure 2 This is a schematic diagram of a battery device 100 according to some embodiments. The battery device 100 includes a housing 10 and a battery cell 30, with the battery cell 30 housed within the housing 10. The housing 10 provides a space for accommodating the battery cell 30, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first portion and a second portion, which overlap each other, jointly defining a space for accommodating the battery cell 30. The second portion may be a hollow structure with one open end, and the first portion may be a plate-like structure, with the first portion covering the open side of the second portion so that the first and second portions jointly define the space; alternatively, both the first and second portions may be hollow structures with one open side, with the open side of the first portion covering the open side of the second portion. Of course, the housing 10 formed by the first and second portions can be of various shapes, such as a cylinder, a cuboid, etc.

[0089] In the battery device 100, there can be multiple battery cells 30, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 30 are connected in both series and parallel connections. Multiple battery cells 30 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 30 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 30 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 30.

[0090] Each battery cell 30 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 30 can be cylindrical, flat, cuboid, or other shapes.

[0091] A battery cell 30 refers to the smallest unit that makes up a battery. A battery cell includes an end cap, a casing, electrode assemblies, and other functional components.

[0092] An end cap is a component that closes onto the opening of the housing to isolate the internal environment of the battery cell 30 from the external environment. The shape of the end cap can be adapted to the shape of the housing to fit it. Optionally, the end cap can be made of a material with a certain degree of hardness and strength (such as aluminum alloy), so that the end cap is less prone to deformation under pressure and impact, giving the battery cell 30 higher structural strength and improving safety performance. Functional components such as electrode terminals can be provided on the end cap. The electrode terminals can be used for electrical connection with electrode assemblies to output or input electrical energy into the battery cell 30.

[0093] In some embodiments, the end cap may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 30 reaches a threshold. The end cap can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating member may also be provided on the inner side of the end cap. The insulating member can be used to isolate the electrical connection components within the housing from the end cap to reduce the risk of short circuits. For example, the insulating member may be made of plastic, rubber, etc.

[0094] The pressure relief structure on the battery cell mentioned in this application is used to release the gas inside the battery cell when the internal pressure is too high (e.g., due to overcharging), thereby reducing the internal pressure of the battery cell and preventing it from exploding due to excessively rapid pressurization. For example, the pressure relief structure can be an explosion-proof valve, an explosion-proof plate, etc.

[0095] The housing is a component used to cooperate with the end cap to form the internal environment of the battery cell 30. This internal environment can accommodate electrode components, electrolyte, and other components. The housing and end cap can be independent components. An opening can be provided on the housing, and the end cap closes the opening to form the internal environment of the battery cell 30. Alternatively, the end cap and housing can be integrated. Specifically, the end cap and housing can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing, the end cap closes the housing. The housing can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing can be determined according to the specific shape and size of the electrode components. The housing can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on these materials.

[0096] The electrode assembly is the component in the battery cell 100 where electrochemical reactions occur. The casing may contain one or more electrode assemblies. The electrode assembly is mainly formed by winding or stacking positive and negative electrode plates, and typically a separator is provided between the positive and negative electrode plates. The portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly, while the portions without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0097] According to some embodiments of this application, please refer to Figure 2 and further refer to Figures 3-7 , Figure 3 This is a top view of a battery device provided according to some embodiments; Figure 4 A cross-sectional view of a battery device provided according to some embodiments; Figure 5 for Figure 4 Enlarged view of the central area; Figure 6 This is a structural schematic diagram of a first side plate according to some embodiments; Figure 7 for Figure 6 A magnified view of the central area.

[0098] This application provides a battery device 100, which includes a housing 10 and a battery cell 30.

[0099] The housing 10 has a flow channel space 11 for the flow of heat exchange medium. The housing 10 has a first side plate 20. The first side plate 20 has a liquid inlet chamber 21 and an isolation chamber 22. The isolation chamber 22 is located on the side of the liquid inlet chamber 21 facing the flow channel space 11. The liquid inlet chamber 21 has a liquid inlet 253 and a first branch port 251 communicating with the isolation chamber 22. The isolation chamber 22 has a second branch port 252 communicating with the flow channel space 11. The liquid inlet 253 is connected to the liquid inlet chamber 21 and is used to input the heat exchange medium into the liquid inlet chamber 21. At least a portion of the battery cell 30 is disposed in the flow channel space 11.

[0100] The flow channel space 11, the isolation cavity 22, and the liquid inlet cavity 21 refer to cavities with a certain space so that the heat exchange medium can flow within the flow channel space 11, the isolation cavity 22, and the liquid inlet cavity 21.

[0101] The first side plate 20 can be an integrally formed structure, and has an inlet cavity 21 and an isolation cavity 22 inside, so as to separate the flow channel space 11 and the inlet cavity 21 by using the isolation cavity 22; the first side plate 20 can also be composed of multiple plates, which are formed by welding, bonding and other processes to form the first side plate 20, and define the inlet cavity 21 and the isolation cavity 22.

[0102] The first side plate 20 can be a metal part, specifically a component made of materials such as copper, aluminum, or aluminum alloy.

[0103] The first diversion port 251 and the second diversion port 252 are located on different walls of the isolation cavity 22. Specifically, the isolation cavity 22 includes a first wall that separates the isolation cavity 22 from the liquid inlet cavity 21. The first diversion port 251 is located on the first wall and can penetrate the first wall in the thickness direction to connect the isolation cavity 22 and the liquid inlet cavity 21, so that the heat exchange medium in the liquid inlet cavity 21 can enter the isolation cavity 22 through the first diversion port 251.

[0104] The isolation cavity 22 also includes a second wall, which separates the flow channel space 11 and the isolation cavity 22. The second branch port 252 is provided on the second wall and can penetrate the second wall in the thickness direction to connect the isolation cavity 22 and the flow channel space 11, so that the heat exchange medium in the isolation cavity 22 can enter the flow channel space 11 through the second branch port 252.

[0105] The heat exchange medium is suitable to enter the liquid inlet chamber 21 from the liquid inlet 253. The heat exchange medium in the liquid inlet chamber 21 is suitable to enter the isolation chamber 22 through the first diversion port 251. The heat exchange medium in the isolation chamber 22 is suitable to enter the flow channel space 11 through the second diversion port 252, so as to use the heat exchange medium to cool the battery cell 30 in the flow channel space 11, thereby reducing the temperature of the battery cell 30 and making the battery cell 30 work at a suitable temperature, which facilitates the improvement of the working efficiency of the battery cell 30.

[0106] Specifically, when the liquid level of the heat exchange medium in the liquid inlet chamber 21 is higher than that of the first branch port 251, the heat exchange medium enters the isolation chamber 22 through the first branch port 251. When the liquid level of the heat exchange medium in the isolation chamber 22 is higher than that of the second branch port 252, the heat exchange medium enters the flow channel space 11 through the second branch port 252.

[0107] At least a portion of the battery cell 30 is disposed within the flow channel space 11. This means that a portion of the battery cell 30 is located within the flow channel space 11. When the heat exchange medium comes into contact with the portion of the battery cell 30 located within the flow channel space 11, it can remove the heat from the battery cell 30, thereby cooling the battery cell 30. Alternatively, all of the battery cell 30 may be located within the flow channel space 11, which facilitates increasing the contact area between the battery cell 30 and the heat exchange medium, thereby improving the cooling efficiency.

[0108] By providing an inlet cavity 21 and an isolation cavity 22 within the first side plate 20, with the isolation cavity 22 located on the side of the inlet cavity 21 facing the flow channel space 11, the inlet cavity 21 and the flow channel space 11 are separated by the isolation cavity 22. In this way, when the heat exchange medium enters the inlet cavity 21 through the inlet port 253, the influence of heat in the flow channel space 11 on the heat exchange medium in the inlet cavity 21 can be reduced, reducing the possibility of a temperature gradient before the heat exchange medium comes into contact with the battery cell 30, thereby ensuring the temperature uniformity of the heat exchange medium and enabling the heat exchange medium to uniformly cool the battery cell 30 in the flow channel space 11, thus improving the uniformity of the heat exchange medium when cooling the battery cell 30.

[0109] In this way, when the heat exchange medium enters the isolation chamber 22 through the first branch port 251, and the heat exchange medium in the isolation chamber 22 enters the flow channel space 11 through the second branch port 252, the uniformity of the temperature of the heat exchange medium entering the flow channel space 11 can be guaranteed, thereby uniformly dissipating heat from the battery cells 30 in the flow channel space 11 and reducing the possibility of uneven heat dissipation and large temperature differences in the battery cells 30 in the flow channel space 11.

[0110] Based on some embodiments of this application, please continue to refer to Figure 3The flow channel space 11 is provided with a plurality of battery cells 30 arranged sequentially along the first direction. The first side plate 20 is located on one side of the flow channel space 11 along the second direction, and both the first side plate 20 and the liquid inlet cavity 21 extend along the first direction. The isolation cavity 22 is located between the liquid inlet cavity 21 and the flow channel space 11.

[0111] Multiple battery cells 30 are arranged in the flow channel space 11 along the first direction. Therefore, the flow channel space 11 is usually relatively long in the first direction. If the heat exchange medium flows directly in the flow channel space 11 along the first direction, the heat exchange medium will have a better cooling effect on the front part of the battery cells 30 when it first enters the flow channel space 11. However, as it continues to flow along the first direction, the heat exchange medium absorbs heat, which leads to a worse cooling effect on the rear part of the battery cells 30. This results in a large temperature difference between the multiple battery cells 30 after heat dissipation for the multiple battery cells 30 in the same flow channel space 11.

[0112] The first side plate 20 and the liquid inlet cavity 21 are both extended along the first direction so that the extension direction of the first side plate 20 and the liquid inlet cavity 21 is consistent with the extension direction of the flow channel space 11, thereby enabling the first side plate 20 to fully separate two adjacent flow channel spaces 11.

[0113] By arranging multiple battery cells 30 along a first direction in the flow channel space 11, the heat exchange medium enters the liquid inlet chamber 21 through the liquid inlet 253. After storing a certain amount of heat exchange medium in the liquid inlet chamber 21, the heat exchange medium enters the isolation chamber 22 through the first diversion port 251. The heat exchange medium in the isolation chamber 22 then enters the flow channel space 11 through the second diversion port 252. This allows a large amount of heat exchange medium to enter the flow channel space 11 in a short time, enabling rapid cooling of the multiple battery cells 30 and solving the problem of temperature gradients when the heat exchange medium cools the multiple battery cells 30.

[0114] When the heat exchange medium is stored in the liquid inlet chamber 21, the isolation chamber 22 can separate the heat exchange medium in the liquid inlet chamber 21 from the flow channel space 11, so as to reduce the influence of heat in the flow channel space 11 on the heat exchange medium in the liquid inlet chamber 21, solve the problem of temperature gradient when the heat exchange medium flows in the flow channel space 11, and make the temperature difference when the heat exchange medium flows in the flow channel space 11 smaller.

[0115] In this way, when the heat exchange medium in the liquid inlet chamber 21 enters the isolation chamber 22 and the flow channel space 11, it is convenient to directly dissipate heat from multiple battery cells 30. On the one hand, this improves the heat dissipation efficiency of the battery cells 30, and on the other hand, it facilitates the improvement of the cooling effect of multiple battery cells 30, reducing the possibility of a large temperature difference between multiple battery cells 30.

[0116] It should be explained here that the front part and the rear part are not limited to the front and rear direction, but only refer to the battery cells 30 in the upstream part when the heat exchange medium flows in the flow channel space 11, that is, the battery cells 30 that come into contact with the heat exchange medium first in time; the battery cells 30 in the rear part refer to the battery cells 30 in the downstream part, that is, the battery cells 30 that come into contact with the heat exchange medium later in time.

[0117] According to some optional embodiments of this application, please continue to refer to Figure 4 and Figure 5 In the first direction, a spacer cavity 35 is defined between adjacent battery cells 30, and the spacer cavity 35 is part of the flow channel space 11.

[0118] Two adjacent battery cells 30 are spaced apart in a first direction to define a spacer cavity 35. Since the battery cells 30 are located within the flow channel space 11, the spacer cavity 35 is part of the flow channel space 11. When the heat exchange medium enters the flow channel space 11, the heat exchange medium can enter the spacer cavity 35.

[0119] By defining a spacer cavity 35 between two adjacent battery cells 30, the heat exchange medium in the flow channel space 11 can enter the spacer cavity 35. This facilitates increasing the contact area between the battery cell 30 and the heat exchange medium, thereby improving the cooling efficiency and cooling effect of the battery cell 30.

[0120] Based on some specific embodiments of this application, please continue to refer to... Figure 6 and Figure 7 In the first direction, there are multiple second shunt ports 252, and each of the multiple second shunt ports 252 and multiple battery cells 30 is set in a one-to-one correspondence.

[0121] "One-to-one correspondence setting" means that the number of battery cells 30 in the same flow channel space 11 corresponds to the number of second diversion ports 252 on the first side plate 20. The heat exchange medium in the isolation cavity 22 flows to the battery cells 30 through the second diversion ports 252. After the heat exchange medium comes into contact with the side wall of the battery cell 30 facing the isolation cavity 22, the heat exchange medium can enter the partition cavity 35 along the gap between the battery cell 30 and the first side plate 20 to come into contact with the side wall of the battery cell 30 in the first direction, thereby increasing the contact area between the heat exchange medium and the battery cell 30 and improving the cooling efficiency of the battery cell 30.

[0122] In this arrangement, multiple battery cells 30 are arranged along a first direction, and multiple second shunt ports 252 are also arranged at intervals along the first direction, so that the multiple second shunt ports 252 are configured to correspond one-to-one with the multiple spacer cavities 35.

[0123] By configuring multiple second diversion ports 252 and multiple battery cells 30 in a one-to-one correspondence, it is ensured that when the heat exchange medium in the isolation cavity 22 flows to the battery cells 30 through the multiple second diversion ports 252 in a one-to-one correspondence, a portion of the heat exchange medium flowing to the battery cells 30 through the second diversion ports 252 can contact the multiple battery cells 30 and absorb the heat generated by the battery cells 30. This ensures that the heat exchange medium does not come into contact with other heat sources before cooling the multiple battery cells 30. As a result, when cooling the multiple battery cells 30 with the heat exchange medium, the temperature gradient problem of the heat exchange medium is solved, and the temperature difference of the heat exchange medium is small. This allows for uniform cooling of the multiple battery cells 30 in the same flow channel space 11, reducing the possibility of a large temperature difference between the multiple battery cells 30.

[0124] In some embodiments, please continue to refer to Figure 3 and Figure 4 In this system, a row of battery cells 30 arranged along a first direction is provided in a flow channel space 11. The number of battery cells 30 is the same as the number of second diversion ports 252 on the first side plate 20. The heat exchange medium in the isolation cavity 22 is adapted to flow to each battery cell 30 through multiple second diversion ports 252 respectively. This solves the temperature gradient problem of the heat exchange medium when cooling multiple battery cells 30, making the temperature difference of the heat exchange medium smaller. This enables the multiple battery cells 30 in the same flow channel space 11 to be cooled uniformly, reducing the possibility of a large temperature difference between multiple battery cells 30.

[0125] In other embodiments, please refer to Figures 8-10 , Figure 8 This is a schematic diagram of the structure of a battery device 100 according to some other embodiments; Figure 9 A cross-sectional view of a battery device 100 provided according to some other embodiments; Figure 10 for Figure 9 A magnified view of the central area.

[0126] In this process, a flow channel space 11 contains multiple battery packs arranged along a second direction. Each battery pack includes multiple battery cells 30 arranged along a first direction. The number of battery cells 30 in a single battery pack is the same as the number of second diversion ports 252 on the first side plate 20. The heat exchange medium in the isolation cavity 22 is adapted to flow through multiple second diversion ports 252 to multiple battery cells 30 in the battery pack located near the isolation cavity 22 first, and then flow along the second direction to other battery packs.

[0127] Although the heat exchange medium has a better heat exchange effect on the upstream battery pack and a worse heat exchange effect on the downstream battery pack when it flows along the second direction, the number of battery packs arranged along the second direction in a flow channel space 11 is usually not too large. For example, there are two or three battery packs arranged along the second direction in a flow channel space 11. In this way, when the heat exchange medium flows to the battery cell 30 in the last battery pack, the heat exchange medium only flows through one or two battery cells 30. Therefore, the heat exchange effect of the heat exchange medium on the battery cells 30 in the same flow channel is relatively uniform, and it can also achieve uniform heat dissipation on multiple battery cells 30, reducing the possibility of large temperature differences between multiple battery cells 30.

[0128] Based on some specific embodiments of this application, please continue to refer to... Figure 6 and Figure 7 In the first direction, there are multiple second diversion ports 252, and each of the multiple second diversion ports 252 is set in a one-to-one correspondence with a multiple spacer cavity 35.

[0129] "One-to-one correspondence setting" means that the number of spacer cavities 35 in the same flow channel space 11 corresponds to the number of second diversion ports 252 on the first side plate 20. When the heat exchange medium in the isolation cavity 22 flows into the spacer cavity 35 through the second diversion port 252, the heat exchange medium can directly enter the spacer cavity 35 and contact the side wall of the battery cell 30 in the first direction, so as to increase the contact area between the heat exchange medium and the battery cell 30, thereby improving the cooling efficiency of the battery cell 30.

[0130] In this arrangement, multiple battery cells 30 are arranged along a first direction, and multiple second shunt ports 252 are also arranged at intervals along the first direction, so that the multiple second shunt ports 252 are configured to correspond one-to-one with the multiple spacer cavities 35.

[0131] Specifically, the battery cells 30 are arranged along the first direction in the length direction, so the sidewalls of the battery cells 30 in the first direction are sidewalls with larger areas.

[0132] By configuring multiple second diversion ports 252 to correspond one-to-one with multiple spacer cavities 35, it is ensured that when the heat exchange medium in the isolation cavity 22 flows into the spacer cavity 35 through the multiple second diversion ports 252, the portion of the heat exchange medium flowing into the spacer cavity 35 through the second diversion ports 252 can contact the sidewalls of the multiple battery cells 30 with a larger area in the first direction and absorb the heat generated by the battery cells 30. This ensures that the heat exchange medium does not come into contact with other heat sources before cooling the multiple battery cells 30, thus solving the temperature gradient problem of the heat exchange medium and making the temperature difference of the heat exchange medium smaller. This allows for uniform cooling of the multiple battery cells 30 in the same flow channel space 11, reducing the possibility of a large temperature difference between the multiple battery cells 30.

[0133] Further, please refer to Figure 6 and Figure 7 As shown, the isolation cavity 22 is a long strip extending along the first direction. The isolation cavity 22 is provided with a plurality of first diversion ports 251 and a plurality of second diversion ports 252 arranged at intervals along the first direction.

[0134] Multiple battery cells 30 are arranged in the flow channel space 11 along the first direction, and the isolation cavity 22 extends along the first direction so that the length of the isolation cavity 22 is adapted to the arrangement of the battery cells 30 in the flow channel space 11.

[0135] By adapting the extension direction of the isolation cavity 22 to the arrangement of multiple battery cells 30, when the heat exchange medium flows into the flow channel space 11 through multiple second branch ports 252, the heat exchange medium in each part of the first direction in the isolation cavity 22 can simultaneously flow into the flow channel space 11, solving the temperature gradient problem of the heat exchange medium, making the temperature difference of the heat exchange medium smaller, and thus ensuring that the heat exchange medium can uniformly cool the multiple battery cells 30.

[0136] In some embodiments, the flow channel space 11, the isolation chamber 22, and the liquid inlet chamber 21 are arranged sequentially along the second direction. The heat exchange medium in the liquid inlet chamber 21 is adapted to enter the flow channel space 11 sequentially through the first branch port 251 and the second branch port 252 along the second direction. Since the flow channel space 11, the isolation chamber 22, and the liquid inlet chamber 21 are adjacent to each other, the flow path of the heat exchange medium in the liquid inlet chamber 21 is relatively short when it enters the flow channel space 11. Moreover, between the corresponding battery cells 30 flowing into the flow channel space 11, there is no contact with other battery cells 30, which solves the temperature gradient problem of the heat exchange medium, makes the temperature difference of the heat exchange medium small, and ensures that the heat exchange medium can uniformly cool multiple battery cells 30.

[0137] According to some specific embodiments of this application, there are multiple isolation cavities 22 arranged along a first direction, and each isolation cavity 22 is provided with a first diversion port 251 and a second diversion port 252.

[0138] Each isolation chamber 22 is provided with a first diversion port 251 and a second diversion port 252, so that the isolation chamber 22 is connected to the liquid inlet chamber 21 and the flow channel space 11, so that the liquid in the liquid inlet chamber 21 can enter the flow channel space 11. At the same time, the isolation chamber 22 can separate the flow channel space 11 and the liquid inlet chamber 21, reduce the influence of heat in the flow channel space 11 on the heat exchange medium in the liquid inlet chamber 21, solve the temperature gradient problem of the heat exchange medium, and make the temperature difference of the heat exchange medium smaller.

[0139] By setting up multiple isolation chambers 22 to fully separate the liquid inlet chamber 21 and the flow channel space 11, the influence of heat in the flow channel space 11 on the liquid inlet chamber 21 is fully reduced, the temperature gradient problem of the heat exchange medium is solved, the temperature difference of the heat exchange medium is small, and thus the heat exchange medium can uniformly cool multiple battery cells 30.

[0140] The liquid inlet chamber 21 is connected to multiple isolation chambers 22. The heat exchange medium in the liquid inlet chamber 21 can enter the isolation chamber 22 through the first diversion port 251. The heat exchange medium in the isolation chamber 22 can flow to the flow channel space 11 through the second diversion port 252. The isolation chamber 22 separates the liquid inlet chamber 21 and the flow channel space 11, which solves the temperature gradient problem of the heat exchange medium, makes the temperature difference of the heat exchange medium smaller, and thus ensures that the heat exchange medium can uniformly cool multiple battery cells 30.

[0141] According to some optional embodiments of this application, please continue to refer to Figure 4 and Figure 5 The spacer cavity 35 is provided with a flow guiding component 40, which is used to change the flow direction of at least part of the heat exchange medium.

[0142] By changing the flow direction of at least part of the heat exchange medium, at least part of the heat exchange medium can flow in a preset direction, thereby enabling the heat exchange medium to fully contact the sidewall of the battery cell 30 with a larger area in the first direction as much as possible, so as to achieve sufficient cooling of the battery cell 30 and then flow out along the preset path, which facilitates the improvement of the cooling effect of the heat exchange medium on the battery cell 30.

[0143] According to some specific embodiments of this application, each spacer cavity 35 is provided with a second diversion port 252, and each spacer cavity 35 is provided with a liquid outlet channel.

[0144] The heat exchange medium is suitable to enter the spacer cavity 35 from the second branch port 252 and flow out from the liquid outlet channel to carry away the heat in the spacer cavity 35 and achieve cooling of the battery cell 30.

[0145] Specifically, the liquid in the isolation chamber 22 is suitable to enter the spacer chamber 35 through the second diversion port 252. After contacting the battery cell 30 in the spacer chamber 35, the flow guiding component 40 guides the heat exchange medium to flow in a preset direction and then flow to the liquid outlet channel, and flows out from the liquid outlet channel to take away the heat on the battery cell 30, thereby achieving heat dissipation of the battery cell 30.

[0146] Furthermore, please continue to refer to Figure 5 The flow guiding component 40 is configured to define a guiding channel 41, which is connected to the second branch port 252 and the liquid outlet channel, for guiding the heat exchange medium from the second branch port 252 to the liquid outlet channel.

[0147] By using the flow guiding component 40 to guide the flow direction of the heat exchange medium, the heat exchange medium flows in a preset direction so that the heat exchange medium can contact the largest surface of the battery cell 30 as much as possible, thereby improving the heat exchange effect of the heat exchange medium on the battery cell 30. Then, the heat exchange medium is guided to flow out from the liquid outlet channel so that the heat exchange medium can carry away the heat on the battery cell 30, thereby achieving heat dissipation of the battery cell 30.

[0148] In some embodiments, please refer to Figure 3 and Figure 5 The first direction extends along the front-to-back direction, and the second direction extends along the left-to-right direction. The second diversion port 252 is located in the area below the first side plate 20. The flow guide assembly 40 and the first side plate 20 define a first flow channel 61, which extends along the up-down direction. The flow guide assembly 40 and the top of the box 10 define a second flow channel 62, which extends along the left-to-right direction. The lower end of the first flow channel 61 is connected to the second diversion port 252, and the upper end of the first flow channel 61 is connected to the second flow channel 62.

[0149] The flow guiding component 40 defines a first guiding channel 411, a second guiding channel 412, a third guiding channel 413, and a fourth guiding channel 414. The first guiding channel 411 extends in the vertical direction and its upper end is connected to the second flow channel 62. The second guiding channel 412 extends in the vertical direction and is spaced apart from the first guiding channel 411 in the horizontal direction. The third guiding channel 413 and the fourth guiding channel 414 both extend in the horizontal direction and their right ends are connected to the first guiding channel 411, while their left ends are connected to the second guiding channel 412.

[0150] A liquid outlet channel is provided on the side wall of the flow channel space 11 facing away from the isolation chamber 22. A third flow channel 63 is defined between the flow guide assembly 40 and the lower wall of the box 10. The third flow channel 63 extends in the left and right direction and its left end is connected to the second guide channel 412, and its right end is connected to the liquid outlet channel.

[0151] Under the action of hydraulic pressure, the heat exchange medium in the isolation chamber 22 enters the first flow channel 61 through the second diversion port 252, flows upward along the first flow channel 61 and enters the second flow channel 62, flows to the right along the second flow channel 62 and enters the first guide channel 411, and when it flows downward along the first guide channel 411, it is diverted into the third guide channel 413 and the fourth guide channel 414, and then flows to the left along the third guide channel 413 and the fourth guide channel 414 and converges into the second guide channel 412, enters the third flow channel 63 along the second guide channel 412, and flows to the liquid outlet channel along the third flow channel 63.

[0152] By controlling the flow direction of the heat exchange medium, it is possible for the heat exchange medium to fully contact the battery cell 30 and then flow out through the liquid outlet channel, so that the heat exchange medium can carry away the heat on the battery cell 30 and achieve better heat dissipation for the battery cell 30.

[0153] In some embodiments, the guide channel 41 has a flow guiding protrusion 42, which can agitate the heat exchange medium when it flows along the guide channel 41, thereby improving the uniformity of the heat exchange medium and reducing the possibility of agglomeration.

[0154] According to some specific embodiments of this application, the flow guiding component 40 is foam that is attached to the battery cell 30.

[0155] The current guiding component 40 can be a foam with adhesive properties, so that the current guiding component 40 can be directly attached to the battery cell 30; the current guiding component 40 can also be attached to the battery cell 30 using an adhesive.

[0156] Specifically, the elasticity and light weight of foam make it easy to cut, which in turn makes it easy to form flow guide components 40 with different structures or shapes according to needs, thus reducing the difficulty of processing.

[0157] The foam also has the characteristic of quick pressure-sensitive fixing, which makes it easy to quickly fix the flow guide component 40 in the required position, making it convenient to use and quick to install.

[0158] In addition, foam typically has an anti-corrosion nickel coating, which effectively prevents electrochemical corrosion and has low surface contact resistance. Simultaneously, foam exhibits high heat and pressure resistance and tensile strength, maintaining stable quality even under extreme temperatures.

[0159] According to some specific embodiments of this application, in the second direction, the isolation cavity 22 is located on the side of the liquid inlet cavity 21 facing the flow channel space 11, and the first diversion port 251 and the second diversion port 252 are staggered; and / or, the first diversion port 251 is located in the middle of the isolation cavity 22, and the liquid inlet 253 is located at the bottom of the isolation cavity 22; and / or, the opening area of ​​the liquid inlet 253 is larger than the opening area of ​​the first diversion port 251; and / or, the liquid inlet cavity 21 and the isolation cavity 22 are located in the middle of the first side plate 20.

[0160] In the above technical solution, by staggering the first diversion port 251 and the liquid inlet 253 in the second direction, it is beneficial to allow the heat exchange medium to remain in the isolation cavity 22, thereby improving the heat insulation effect in the isolation cavity 22, reducing the influence of heat in the flow channel space 11 on the heat exchange medium, and improving the overall strength of the first side plate 20.

[0161] Specifically, since drilling holes in the first side plate 20 would reduce the structural strength of the first side plate 20, the drilling positions are staggered to ensure the structural strength of the first side plate 20 while drilling.

[0162] Furthermore, by placing the first diversion port 251 in the middle of the isolation chamber 22, the heat exchange medium will only enter the isolation chamber 22 when the liquid level of the heat exchange medium in the inlet chamber 21 exceeds the first diversion port 251. This allows the inlet chamber 21 to store a portion of the heat exchange medium, facilitating the rapid entry of a large amount of heat exchange medium into the flow channel space 11 in a short time. This enables rapid heat exchange between multiple battery cells 30 and reduces the possibility of a temperature gradient before the heat exchange medium contacts the battery cells 30. By making the opening area of ​​the inlet port 253 larger than the opening area of ​​the first diversion port 251, the isolation chamber 22 can be further improved. The heat exchange medium inside the isolation cavity 22 can quickly enter the flow channel space 11 to control the residence time of the heat exchange medium in the isolation cavity 22, reduce the influence of heat in the flow channel space 11 on the heat exchange medium in the isolation cavity 22, and reduce the possibility of a temperature gradient before the heat exchange medium exchanges heat with the battery cell 30. By placing the liquid inlet cavity 21 and the isolation cavity 22 in the middle of the first side plate 20, it is beneficial to reduce the risk of low flow efficiency of the heat exchange medium due to insufficient pressure caused by the excessive area of ​​the liquid inlet cavity 21, thereby improving the heat exchange efficiency of the heat exchange medium to the battery cell 30.

[0163] In some embodiments, isolation chambers 22 are provided on both sides of the liquid inlet cavity 21. By providing isolation chambers 22 on both sides of the liquid inlet cavity 21, the two isolation chambers 22 are used to separate the liquid inlet cavity 21 and the flow channel space 11 located on both sides of the liquid inlet cavity 21 in the first direction, thereby helping to fully reduce the influence of heat in the flow channel space 11 located on both sides of the liquid inlet cavity 21 on the heat exchange medium in the liquid inlet cavity 21. The possibility of a temperature gradient appearing in the cooling heat exchange medium before exchanging heat with the battery cell 30 is reduced, which helps to improve the heat exchange effect of the heat exchange medium on the battery cell 30.

[0164] In some examples, the first diversion port 251 and the inlet port 253 can be disposed on different side walls of the isolation cavity 22 to achieve a staggered arrangement of the first diversion port 251 and the inlet port 253 in the first direction, which is beneficial to improving the structural strength of the first side plate 20. For example, the first diversion port 251 and the inlet port 253 are respectively disposed on two opposite side walls of the isolation cavity 22 along the first direction, and the first diversion port 251 and the inlet port 253 are arranged at intervals in the second direction, for example, the first diversion port 251 is located to the left of the inlet port 253 along the second direction. Alternatively, the first diversion port 251 and the liquid inlet 253 are respectively disposed on two opposite side walls of the isolation cavity 22 along the first direction, and the first diversion port 251 and the liquid inlet 253 are arranged at intervals in the third direction. For example, one of the first diversion port 251 and the liquid inlet 253 is located at the bottom of the isolation cavity 22, and the other of the first diversion port 251 and the liquid inlet 253 is located at the top of the isolation cavity 22. This is beneficial to reduce the direct outflow of the heat exchange medium through the liquid inlet 253 after entering the isolation cavity 22 through the first diversion port 251, thereby making the heat exchange medium stagnate in the isolation cavity 22, which in turn helps to improve the heat insulation effect in the isolation cavity 22.

[0165] In some examples, the inlet 253 is positioned closer to the top of the isolation chamber 22 than the first branch port 251. When the liquid level of the heat exchange medium in the isolation chamber 22 reaches the inlet 253, the heat exchange medium can be discharged from the isolation chamber 22 through the inlet 253, which helps to prolong the residence time of the heat exchange medium in the isolation chamber 22, thereby improving the heat insulation effect in the isolation chamber 22.

[0166] In some examples, the first branch port 251 and the second branch port 252 are staggered in the height direction, which facilitates the use of liquid level difference to allow the heat exchange medium to enter the flow channel space 11 more smoothly.

[0167] In some embodiments, please refer to Figure 7 The first diversion port 251 is located in the middle of the isolation cavity 22, and the second diversion port 252 is located at the bottom of the isolation cavity 22.

[0168] It should be noted that "middle" refers to the middle position of the isolation cavity 22 in the third direction, and "bottom" refers to the position of the isolation cavity 22 near the bottom in the third direction.

[0169] The height of the housing 10 extends vertically. The first diversion port 251 is located in the middle of the isolation chamber 22, and the second diversion port 252 is located at the bottom of the isolation chamber 22. That is, the first diversion port 251 is located higher in the vertical direction, and the second diversion port 252 is located lower in the vertical direction.

[0170] By setting the first diversion port 251 in the middle of the isolation chamber 22, the heat exchange medium will only enter the isolation chamber 22 when the liquid level in the inlet chamber 21 exceeds the first diversion port 251. This allows a certain amount of heat exchange medium to be stored in the inlet chamber 21, which facilitates the rapid entry of a large amount of heat exchange medium into the flow channel space 11 in a short time. This enables the heat exchange medium to quickly cool multiple battery cells 30 and reduces the possibility of a temperature gradient before the heat exchange medium comes into contact with the battery cells 30.

[0171] The second diversion port 252 is located at the bottom of the isolation chamber 22 so that the liquid entering the isolation chamber 22 can quickly enter the flow channel space 11, thereby controlling the residence time of the heat exchange medium in the isolation chamber 22, reducing the impact of the heat in the flow channel space 11 on the heat exchange medium in the isolation chamber 22, and reducing the possibility of a temperature gradient appearing in the heat exchange medium before it comes into contact with the battery cell 30.

[0172] In some examples, the first diversion port 251 is located in the middle of the isolation cavity 22, and the second diversion port 252 is located at the bottom of the isolation cavity 22. That is, the first diversion port 251 is located above the second diversion port 252 and the first diversion port 251 and the second diversion port 252 are offset in a first direction.

[0173] In other embodiments, the second diversion port 252 is located at the top of the isolation cavity 22.

[0174] By setting the second diversion port 252 at a higher position, the isolation cavity 22 is filled with heat exchange medium, which helps to ensure the heat insulation effect of the isolation cavity 22 and reduces the impact of heat in the flow channel space 11 on the heat exchange medium in the liquid inlet cavity 21.

[0175] In some examples, the first diversion port 251 is located in the middle of the isolation cavity 22, and the second diversion port 252 is located at the top of the isolation cavity 22. That is, the second diversion port 252 is located above the first diversion port 251, and the first diversion port 251 and the second diversion port 252 are offset in a first direction.

[0176] According to some embodiments of this application, the opening area of ​​the second diversion port 252 is larger than the opening area of ​​the first diversion port 251.

[0177] The shapes of the first diversion port 251 and the second diversion port 252 can be circular, rectangular, triangular or other shapes.

[0178] By making the opening area of ​​the second branch port 252 larger than the opening area of ​​the first branch port 251, the heat exchange medium in the isolation cavity 22 can quickly enter the flow channel space 11, thereby controlling the residence time of the heat exchange medium in the isolation cavity 22, reducing the impact of the heat in the flow channel space 11 on the heat exchange medium in the isolation cavity 22, and reducing the possibility of a temperature gradient appearing in the heat exchange medium before contacting the battery cell 30.

[0179] Specifically, since the isolation chamber 22 separates the liquid inlet chamber 21 and the flow channel space 11, the heat in the flow channel space 11 has a relatively small impact on the heat exchange medium located in the liquid inlet chamber 21. However, since the isolation chamber 22 is adjacent to the flow channel space 11, if the heat exchange medium is stored in the isolation chamber 22 for a long time, it may cause the heat exchange medium to absorb some heat before it comes into contact with the battery cell 30. This means that the longer the heat exchange medium is stored in the isolation chamber 22, the worse the cooling uniformity of the heat exchange medium on the battery cell 30 will be, which may easily affect the uniformity of the heat exchange medium when cooling multiple battery cells 30.

[0180] Therefore, the opening area of ​​the second branch port 252 is made larger than the opening area of ​​the first branch port 251 so that the heat exchange medium in the isolation cavity 22 can quickly enter the flow channel space 11, reducing the time that the heat exchange medium will be stored in the isolation cavity 22, thereby reducing the impact of heat in the flow channel space 11 on the heat exchange medium in the isolation cavity 22, and improving the uniformity of the heat exchange medium when cooling multiple battery cells 30.

[0181] In some embodiments, the size of a single second diversion port 252 in the first direction is 1 mm to 3 mm.

[0182] Based on some embodiments of this application, please continue to refer to Figure 9 and Figure 10 The liquid inlet chamber 21 and the isolation chamber 22 are located in the middle of the first side plate 20.

[0183] The liquid inlet chamber 21 and the isolation chamber 22 are arranged along the second direction. The length direction of both the liquid inlet chamber 21 and the isolation chamber 22 extends along the first direction. The middle part of the first side plate 20 refers to the third direction. The liquid inlet chamber 21 and the isolation chamber 22 are located in the middle part of the first side plate 20. The first direction, the second direction and the third direction are perpendicular to each other.

[0184] The third direction is the height direction of the first side plate 20, and the liquid inlet chamber 21 and the isolation chamber 22 are located in the middle of the first side plate 20 in the height direction.

[0185] In the above technical solution, by setting the liquid inlet chamber 21 and the isolation chamber 22 in the middle of the first side plate 20 in the height direction, it is beneficial to increase the pressure at the liquid inlet 253, thereby improving the flow efficiency of the heat exchange medium.

[0186] Specifically, compared to constructing the liquid inlet cavity 21 and the isolation cavity 22 as a whole on the first side plate 20, constructing the liquid inlet cavity 21 and the isolation cavity 22 in the middle of the first side plate 20 in the height direction is beneficial to reducing the area of ​​the liquid inlet cavity 21 and the isolation cavity 22. This is beneficial to increasing the pressure when the heat exchange medium flows into the liquid inlet cavity 21, and further beneficial to increasing the pressure when the heat exchange medium flows to the liquid inlet 253, thereby improving the flow efficiency of the heat exchange medium. This is beneficial to reducing the risk of low flow efficiency of the heat exchange medium due to insufficient pressure caused by the excessive area of ​​the liquid inlet cavity 21, thereby improving the heat exchange efficiency of the heat exchange medium to the battery cell 30.

[0187] Furthermore, by placing the liquid inlet chamber 21 and the isolation chamber 22 in the middle of the first side plate 20, the airtightness of the liquid inlet chamber 21 and the isolation chamber 22 can be improved. Specifically, compared with other positions, the strength of the middle part of the first side plate 20 is higher. Since the battery cell 30 generates gas during charging and discharging, the battery cell 30 exerts a certain compressive force on the first side plate 20. Placing the liquid inlet chamber 21 and the isolation chamber 22 in the middle of the first side plate 20 can reduce the degree of deformation caused by the compression of the side walls of the liquid inlet chamber 21 and the isolation chamber 22, thereby reducing the probability of damage to the side walls of the liquid inlet chamber 21 and the isolation chamber 22 and improving the airtightness of the liquid inlet chamber 21 and the isolation chamber 22.

[0188] Among them, "the first diversion port 251 and the liquid inlet 253 are staggered in the first direction" is defined as condition A1, "the first diversion port 251 is located in the middle of the isolation cavity 22 and the liquid inlet 253 is located at the bottom of the isolation cavity 22" is defined as condition A2, "the opening area of ​​the liquid inlet 253 is greater than the opening area of ​​the first diversion port 251" is defined as condition A3, and "the liquid inlet cavity 21 and the isolation cavity 22 are located in the middle of the first side plate 20" is defined as condition A4. The battery device 100 can satisfy at least one of conditions A1-A4 to improve the heat exchange effect of the heat exchange medium.

[0189] It is understandable that the specific conditions for the battery device 100 to meet can be determined according to actual production requirements, and no specific limitations are made here.

[0190] Based on some embodiments of this application, please continue to refer to Figure 2 The housing 10 has multiple flow channel spaces 11, each of which contains a battery cell 30, and at least some of the flow channel spaces 11 are provided with an isolation cavity 22.

[0191] The flow channel space 11 and the isolation cavity 22 are arranged along the second direction. The first side plate 20 defines the isolation cavity 22 and the liquid inlet cavity 21. Multiple flow channel spaces 11 are arranged along the second direction, such that at least some flow channel spaces 11 are provided with isolation cavities 22, that is, a first side plate 20 is provided between at least two adjacent flow channel spaces 11, so that at least some flow channel spaces 11 are provided with isolation cavities 22.

[0192] Of course, at least some of the flow channel spaces 11 are provided with isolation cavities 22. This could mean that several flow channel spaces 11 are provided with isolation cavities 22, or that each flow channel space 11 is provided with an isolation cavity 22.

[0193] By providing an isolation chamber 22 for at least a portion of the flow channel space 11, the flow channel space 11 and the liquid inlet chamber 21 are separated by the isolation chamber 22. This reduces the impact of heat in the flow channel space 11 on the heat exchange medium in the liquid inlet chamber 21 when the heat exchange medium enters the liquid inlet chamber 21 through the liquid inlet 253. It also reduces the possibility that the heat exchange medium will absorb heat in the flow channel space 11 before entering the flow channel space 11, thereby reducing the possibility of a temperature gradient appearing in the heat exchange medium before contacting the battery cell 30. This ensures the uniformity of the heat exchange medium when cooling multiple battery cells 30 in the flow channel space 11.

[0194] According to some optional embodiments of this application, please continue to refer to Figure 2 and Figure 5 At least two adjacent flow channel spaces 11 are spaced apart by the first side plate 20, and isolation chambers 22 are provided on both sides of the liquid inlet chamber 21.

[0195] Multiple flow channel spaces 11 are arranged along two directions, and both the flow channel space 11 and the first side plate 20 extend along the first direction so that the first side plate 20 can be used to separate two adjacent flow channel spaces 11.

[0196] The first side plate 20 defines an isolation chamber 22, an inlet chamber 21, and another isolation chamber 22 arranged sequentially along the second direction. The two isolation chambers 22 separate the inlet chamber 21 and the flow channel space 11 located on both sides of the inlet chamber 21, thereby significantly reducing the impact of heat in the flow channel space 11 on the heat exchange medium in the inlet chamber 21. This reduces the possibility of a temperature gradient in the heat exchange medium before it comes into contact with the battery cell 30, ensuring the uniformity of the heat exchange medium when cooling multiple battery cells 30 in the flow channel space 11.

[0197] Based on some specific embodiments of this application, please continue to refer to... Figure 3 The housing 10 also includes a second side plate 50 for participating in defining the flow channel space 11. The second side plate 50 is provided with a liquid outlet cavity 51 and a liquid outlet channel connecting the liquid outlet cavity 51 and the flow channel space 11.

[0198] The second side plate 50 can be an integrally formed structure with an internal liquid outlet cavity 51; the second side plate 50 can also be composed of multiple plates, which are formed by welding, bonding and other processes to define the liquid outlet cavity 51.

[0199] The second side plate 50 can be a metal part, specifically a component made of materials such as copper, aluminum, or aluminum alloy.

[0200] The second side plate 50 is provided with a liquid outlet channel, which connects the liquid outlet cavity 51 and the flow channel space 11. The heat exchange medium in the flow channel space 11 is suitable to enter the liquid outlet cavity 51 through the liquid outlet channel, so that the heat exchange medium can carry away the heat in the flow channel space 11 when it flows out of the flow channel space 11, thereby achieving the cooling of the battery cell 30 in the flow channel space 11.

[0201] The liquid outlet channel can be located at the lower part of the liquid outlet cavity 51 or at the upper part of the liquid outlet cavity 51.

[0202] In some embodiments, the liquid outlet channel penetrates one sidewall of the liquid outlet cavity 51 facing the flow channel space 11 to connect the liquid outlet cavity 51 and the flow channel space 11, so that the heat exchange medium in the flow channel space 11 can smoothly enter the liquid outlet cavity 51 through the liquid outlet channel.

[0203] Furthermore, the first side plate 20 and the second side plate 50 are arranged opposite to each other.

[0204] The first side plate 20 and the second side plate 50 are arranged opposite each other along the second direction to define two sidewalls of the flow channel space 11 in the second direction. That is, the first side plate 20 and the second side plate 50 are located on both sides of the flow channel space 11 in the second direction. Therefore, the isolation chamber 22 and the liquid inlet chamber 21 are located on one side of the flow channel space 11 in the second direction, and the liquid outlet chamber 51 is located on the other side of the flow channel space 11 in the second direction.

[0205] The heat exchange medium in the liquid inlet chamber 21 is suitable to enter the isolation chamber 22 through the first diversion port 251. The heat exchange medium in the isolation chamber 22 enters the flow channel space 11 through the second diversion port 252. The heat exchange medium entering the flow channel space 11 is suitable to exchange heat with the battery cell 30. Then the heat exchange medium enters the liquid outlet chamber 51 through the liquid outlet channel.

[0206] The liquid outlet chamber 51 defines an outlet 511 at one end of its extending direction. Liquid entering the liquid outlet chamber 51 is suitable to flow out through the outlet 511 to remove heat from the battery cell 30 in the flow channel space 11, thereby achieving cooling of the battery cell 30.

[0207] In some embodiments, a plurality of battery cells 30 are arranged in the flow channel space 11 along a first direction, and a spacer cavity 35 is defined between adjacent battery cells 30. The spacer cavity 35 is part of the flow channel space 11. A flow guiding component 40 is provided in the spacer cavity 35 to change the flow direction of at least part of the heat exchange medium, so that the heat exchange medium flows to the liquid outlet channel along a preset direction, and then enters the liquid outlet cavity 51 through the liquid outlet channel, so that the heat exchange medium in the spacer cavity 35 converges in the liquid outlet cavity 51.

[0208] In some embodiments, at least two adjacent flow channel spaces 11 are spaced apart by a second side plate 50.

[0209] Specifically, in an embodiment where the second side plate 50 defines a liquid outlet cavity 51, at least two adjacent flow channel spaces 11 share a single liquid outlet cavity 51. Alternatively, in an embodiment where the second side plate 50 defines multiple liquid outlet cavities 51, at least two adjacent flow channel spaces 11 share a single second side plate 50 defining multiple liquid outlet cavities 51.

[0210] Among them, multiple flow channel spaces 11 are arranged along the second direction, and at least two adjacent flow channel spaces 11 refer to two flow channel spaces 11 that are adjacent in the second direction. A second side plate 50 is provided between two adjacent flow channel spaces 11 in the second direction.

[0211] By having at least two adjacent flow channel spaces 11 share a liquid outlet cavity 51 defined on a second side plate 50, the utilization rate of the liquid outlet cavity 51 can be improved, the efficiency of the flow channel space 11 in discharging the heat exchange medium can be increased, and rapid cooling of the battery cell can be achieved.

[0212] In some examples, please refer to Figure 3 Multiple flow channel spaces 11 are arranged sequentially in the second direction, and the first side plate 20 and the second side plate 50 are staggered in the second direction.

[0213] The staggered arrangement means that a first side plate 20 is provided between two adjacent second side plates 50, and similarly, a second side plate 50 is provided between two adjacent first side plates 20.

[0214] By staggering the first side plate 20 and the second side plate 50 in the second direction, the first side plate 20 and the second side plate 50 can form two opposite side walls of the flow channel space 11 in the second direction, so that each flow channel space 11 is connected to the liquid inlet chamber 21 and the liquid outlet chamber 51, thereby realizing that the heat exchange medium can quickly flow out of the flow channel space 11 after entering the flow channel space 11, and thus cooling the battery cell 30.

[0215] For example, the box has an even number of N flow channel spaces 11 arranged along the second direction, the number of first side plates 20 is N / 2, that is, at least N / 2 liquid inlet chambers 21, and the number of second side plates 50 is N / 2+1, that is, at least N / 2+1 liquid outlet chambers 51.

[0216] It should be explained here that when each first side plate 20 has one liquid inlet cavity 21, there are N / 2 liquid inlet cavities 21, and the first side plate 20 may also have multiple liquid inlet cavities 21, so there are at least N / 2 liquid inlet cavities 21; when each second side plate 50 has one liquid outlet cavity 51, there are N / 2+1 liquid outlet cavities 51, and the second side plate 50 may also have multiple liquid outlet cavities 51, so there are at least N / 2 liquid inlet cavities 21.

[0217] Each flow channel space 11 can be equipped with a liquid inlet chamber 21 for liquid intake and two liquid outlet chambers 51 for heat exchange medium discharge, so as to achieve a shorter cooling path and facilitate rapid and uniform cooling of multiple battery cells 30.

[0218] In some embodiments, the outlet 511 of the outlet chamber 51 and the inlet 253 of the inlet chamber 21 are located on the same side of the housing 10 in the first direction, which facilitates the connection of the outlet 511 and the inlet 253 by pipeline.

[0219] In some examples, the housing has six flow channel spaces 11, and the battery device 100 includes four second side plates 50 and three first side plates 20, the first side plates 20 and the second side plates 50 being staggered along a second direction, the four second side plates 50 and the three first side plates 20 together defining the six flow channel spaces 11 with the housing 10.

[0220] These six flow channel spaces 11 are referred to as the first to sixth flow channel spaces along the second direction.

[0221] The first side plate 20 defines two isolation chambers 22 and one liquid inlet chamber 21. The two isolation chambers 22 are located on both sides of the liquid inlet chamber 21 in the second direction. The first flow channel space and the second flow channel space share one liquid inlet chamber 21. The third flow channel space and the fourth flow channel space share one liquid inlet chamber 21. The fifth flow channel space and the sixth flow channel space share one liquid inlet chamber 21.

[0222] The first flow channel space uses a separate liquid outlet chamber 51, the second and third flow channel spaces share a liquid outlet chamber 51, the fourth and fifth flow channel spaces share a liquid outlet chamber 51, and the sixth flow channel space uses a separate liquid outlet chamber 51.

[0223] Specifically, the battery device 100 includes three liquid inlet chambers 21 and four liquid outlet chambers 51, and the liquid inlet chambers 21 and liquid outlet chambers 51 are arranged alternately in the second direction to facilitate a shorter cooling path and rapid liquid outlet of the heat exchange medium, thereby improving the cooling efficiency of the heat exchange medium on the battery cell 30.

[0224] According to some embodiments of this application, a battery device 100 is provided. The battery device 100 includes a battery cell 30, a housing 10, and a plurality of first side plates 20 and a plurality of second side plates 50. The length direction of both the first side plates 20 and the second side plates 50 extends along a first direction.

[0225] Multiple first side plates 20 and multiple second side plates 50 are alternately arranged in the housing 10 along the second direction to divide the housing 10 into multiple flow channel spaces 11 arranged along the second direction. The length direction of the flow channel space 11 extends along the first direction, and multiple battery cells 30 are arranged in the flow channel space 11 along the first direction.

[0226] The first side plate 20 defines an inlet chamber 21 and two isolation chambers 22. The inlet chamber 21 has an inlet port 253, and the two isolation chambers 22 are located on opposite sides of the inlet chamber 21 in a second direction. Each isolation chamber 22 has a first branch port 251 communicating with the inlet chamber 21 and a second branch port 252 communicating with the flow channel space 11. The first branch port 251 is located in the middle of the isolation chamber 22, and the second branch port 252 is located at the bottom of the isolation chamber 22. The second side plate 50 defines an outlet chamber 51, which communicates with the flow channel space 11.

[0227] Multiple battery cells 30 are arranged in the flow channel space 11 along the first direction. A spacer cavity 35 is defined between adjacent battery cells 30. The spacer cavity 35 is part of the flow channel space 11. A flow guiding component 40 is provided in the spacer cavity 35. The flow guiding component 40 is used to change the flow direction of at least part of the heat exchange medium, so that the heat exchange medium flows to the liquid outlet cavity along a preset direction.

[0228] Specifically, the heat exchange medium enters the liquid inlet chamber 21 through the liquid inlet 253. After a certain amount of heat exchange medium is stored in the liquid inlet chamber 21, the heat exchange medium enters the isolation chamber 22 through the first diversion port 251. The heat exchange medium in the isolation chamber 22 enters the flow channel space 11 through the second diversion port 252. This facilitates the entry of a large amount of heat exchange medium into the spacer chamber 35 in a short time, so as to use the heat exchange medium to quickly cool multiple battery cells 30 and solve the problem of temperature gradient when the heat exchange medium cools multiple battery cells 30.

[0229] The heat exchange medium in the partition cavity 35 flows towards the liquid outlet cavity under the guidance of the flow guiding component 40, and then enters the liquid outlet cavity 51 through the liquid outlet cavity, so that the heat exchange medium in the partition cavity 35 gathers in the liquid outlet cavity 51 and flows out from the liquid outlet 511 of the liquid outlet cavity 51.

[0230] In some examples, the battery device 100 includes four second side plates 50 and three first side plates 20, the first side plates 20 and the second side plates 50 being staggered along a second direction, and the four second side plates 50 and the three first side plates 20 together define six flow channel spaces 11 with the housing 10.

[0231] These six flow channel spaces 11 are referred to as the first to sixth flow channel spaces along the second direction.

[0232] The first and second flow channels share a liquid inlet chamber 21, the third and fourth flow channels share a liquid inlet chamber 21, and the fifth and sixth flow channels share a liquid inlet chamber 21.

[0233] The first flow channel space uses a separate liquid outlet chamber 51, the second and third flow channel spaces share a liquid outlet chamber 51, the fourth and fifth flow channel spaces share a liquid outlet chamber 51, and the sixth flow channel space uses a separate liquid outlet chamber 51.

[0234] Specifically, the battery device 100 includes three liquid inlet chambers 21 and four liquid outlet chambers 51, and the liquid inlet chambers 21 and liquid outlet chambers 51 are arranged alternately in the second direction to facilitate a shorter cooling path and rapid liquid outlet of the heat exchange medium, thereby improving the cooling efficiency of the heat exchange medium on the battery cell 30.

[0235] According to some embodiments of this application, this application also provides an electrical device, including the battery device 100 in the above embodiments, the battery device 100 being used to store or provide electrical energy.

[0236] In the above technical solution, by using a battery device 100 with good cooling effect, the stability of the electrical device is improved, the reliability of the electrical device is enhanced, and the service life is extended.

[0237] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: The housing has a flow channel space for the flow of heat exchange medium. The housing has a first side plate, and the first side plate has a liquid inlet chamber and an isolation chamber. The isolation chamber is located on the side of the liquid inlet chamber facing the flow channel space. The liquid inlet chamber has a liquid inlet and a first branch port communicating with the isolation chamber. The isolation chamber has a second branch port communicating with the flow channel space. The liquid inlet is connected to the liquid inlet chamber and is used to input heat exchange medium into the liquid inlet chamber. A battery cell, at least a portion of which is disposed within the flow channel space.

2. The battery device according to claim 1, characterized in that, The flow channel space contains a plurality of battery cells arranged sequentially along a first direction. The first side plate is located on one side of the flow channel space along a second direction, and both the first side plate and the liquid inlet cavity extend along the first direction. The isolation cavity is located between the liquid inlet cavity and the flow channel space.

3. The battery device according to claim 2, characterized in that, In the first direction, a spacer cavity is defined between adjacent battery cells, the spacer cavity being part of the flow channel space.

4. The battery device according to claim 3, characterized in that, In the first direction, there are multiple second shunt ports, and each of the multiple second shunt ports corresponds to one of the multiple battery cells; or Multiple second diversion ports are provided in a one-to-one correspondence with multiple spacer cavities.

5. The battery device according to claim 4, characterized in that, The isolation cavity is a long strip extending along the first direction, and the isolation cavity is provided with a plurality of first diversion ports and a plurality of second diversion ports arranged at intervals along the first direction.

6. The battery device according to claim 4, characterized in that, The isolation cavities are multiple and arranged along the first direction, and each isolation cavity is provided with the first diversion port and the second diversion port.

7. The battery device according to any one of claims 3-6, characterized in that, The spacer cavity is provided with a flow guiding component to change the flow direction of at least a portion of the heat exchange medium.

8. The battery device according to claim 7, characterized in that, Each of the spacer cavities is provided with a second diversion port, and each of the spacer cavities is provided with a liquid outlet cavity.

9. The battery device according to claim 8, characterized in that, The flow guiding component is configured to define a guiding channel that communicates with the second diversion port and the liquid outlet cavity, for guiding the heat exchange medium from the second diversion port to the liquid outlet cavity.

10. The battery device according to any one of claims 7-9, characterized in that, The flow guiding component is foam that is attached to the battery cell.

11. The battery device according to any one of claims 1-10, characterized in that, In the second direction, the isolation chamber is located on the side of the liquid inlet chamber facing the flow channel space, and the first diversion port and the second diversion port are offset in the second direction; And / or, The first diversion port is located in the middle of the isolation cavity, and the second diversion port is located at the bottom of the isolation cavity; and / or, The opening area of ​​the second diversion port is larger than the opening area of ​​the first diversion port; And / or, The liquid inlet chamber and the isolation chamber are located in the middle of the first side plate.

12. The battery device according to any one of claims 1-10, characterized in that, The housing contains multiple flow channel spaces, each of which contains a battery cell, and at least a portion of the flow channel spaces are provided with an isolation cavity.

13. The battery device according to claim 12, characterized in that, At least two adjacent flow channel spaces are spaced apart by the first side plate, and the isolation chambers are provided on both sides of the liquid inlet chamber.

14. The battery device according to claim 13, characterized in that, The housing also includes a second side plate for participating in defining the flow channel space. The second side plate is provided with a liquid outlet cavity and a liquid outlet channel connecting the liquid outlet cavity and the flow channel space.

15. The battery device according to claim 14, characterized in that, The first side plate and the second side plate are arranged opposite to each other.

16. The battery device according to claim 15, characterized in that, At least two adjacent flow channel spaces are spaced apart by the second side plate.

17. The battery device according to claim 16, characterized in that, The multiple flow channel spaces are arranged sequentially in the second direction, and the first side plate and the second side plate are staggered in the second direction.

18. An electrical appliance, characterized in that, Includes a battery device according to any one of claims 1-17, the battery device being used to store or provide electrical energy.

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