Battery device and electric device

Abstract

The utility model relates to the technical field of batteries and discloses a battery device and a power utilization device.The battery device comprises a box body, single batteries and a heat exchange part, a containing cavity and a runner cavity are formed in the box body, a communication opening is formed in the cavity wall of the side, facing the containing cavity, of the runner cavity, the single batteries are contained in the containing cavity, and the heat exchange part is contained in the containing cavity; the heat exchange part is in heat conduction fit with the battery monomers, is internally provided with a heat exchange flow channel, is fixedly connected with the box body and is hermetically connected to the communication port, so that the accommodating cavity and the flow channel cavity are separated, and the heat exchange flow channel is communicated with the flow channel cavity through the communication port. Therefore, the communication port is formed in the cavity wall of one side, facing the accommodating cavity, of the flow channel cavity, so that the space of the flow channel cavity can be fully utilized, and the energy density of the battery device is favorably improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Art

[0002] With the development of current society and the advancement of technology, the application of battery devices is becoming more and more extensive. During the use of the battery device, the battery cells in the battery device will generate heat, and a heat exchanger is usually required to dissipate the heat of the battery cells. However, the space utilization rate of the battery device with a heat exchanger needs to be further improved. Utility Model Content

[0003] The present application proposes a battery device and an electrical device. By arranging a connecting port on a side wall of the flow channel cavity facing the accommodating cavity, the space of the flow channel cavity can be more fully utilized so that the connecting port does not occupy additional space in the accommodating cavity, which is beneficial to improving the energy density of the battery device.

[0004] In the first aspect, an embodiment of the present application provides a battery device, comprising: a box body, a battery cell and a heat exchanger, the box body having a accommodating chamber and a flow channel chamber, the flow channel chamber having a connecting port on a cavity wall facing the accommodating chamber, the battery cell being accommodated in the accommodating chamber, the heat exchanger being accommodated in the accommodating chamber, and the heat exchanger and the battery cell being heat-conductively matched, the heat exchanger having a heat exchange flow channel, the heat exchanger being fixedly connected to the box body and sealed at the connecting port to separate the accommodating chamber and the flow channel chamber, and to connect the heat exchange flow channel with the flow channel chamber through the connecting port.

[0005] In the above technical solution, a connecting port is provided on the cavity wall of the flow channel cavity facing the accommodating cavity, and the heat exchange component is fixedly connected to the box body and sealed at the connecting port, so that the heat exchange medium in the flow channel cavity can take away the heat generated by the battery cell through the heat exchange flow channel, and can more fully utilize the space of the flow channel cavity, so that the connecting port does not occupy additional space in the accommodating cavity, is not easy to affect the arrangement of the battery cell in the accommodating cavity, is convenient for improving the energy density of the battery device, and is conducive to realizing the miniaturized design of the battery device.

[0006] In some embodiments, the heat exchange element and the housing are welded and fixed at the connecting opening.

[0007] In the above technical solution, the heat exchange element is fixed to the housing by welding at the connecting port, so that the setting position of the heat exchange element is more stable, thereby reducing the possibility of liquid leakage at the connecting port.

[0008] In some embodiments, the battery cell includes a first wall, which is a wall with the largest area in the battery cell, and the heat exchange element cooperates with the first wall in a heat-conducting manner.

[0009] In the above technical solution, the heat exchange element cooperates with the wall with the largest area in the battery cell to conduct heat, which is convenient for increasing the heat exchange area of ​​the heat exchange element and the battery cell, so as to make the operation of the battery device more stable.

[0010] In some embodiments, the heat exchange element is fixedly connected to the first wall.

[0011] In the above technical solution, by fixedly connecting the heat exchange element to the first wall, the heat conduction cooperation between the heat exchange element and the battery cell is made more stable, thereby facilitating improving the stability of the operation of the battery device.

[0012] In some embodiments, the heat exchange element is a plate-like structure, at least one of the two ends of the heat exchange element in the length direction corresponds to a connecting port, and at least one of the two ends of the heat exchange element in the length direction is fixedly connected to the box body, and at least one of the two side walls of the heat exchange element in the thickness direction is thermally conductive with the battery cell.

[0013] In the above technical solution, the plate-shaped heat exchanger has a simpler structure and is easy to process and manufacture; at least one of the two ends of the heat exchanger in the length direction corresponds to a connecting port, so that the setting position of the connecting port is more flexible; at least one of the two ends of the heat exchanger in the length direction is fixedly connected to the box body, so that the setting position of the heat exchanger is more stable; at least one of the two side walls of the heat exchanger in the thickness direction cooperates with the battery cell for heat conduction, so that the setting position of the heat exchanger is more flexible and can improve the space utilization rate in the battery device.

[0014] In some embodiments, at least one of the two ends of the heat exchange element in the height direction is fixedly connected to the box body.

[0015] In the above technical solution, by fixing at least one of the two ends of the heat exchanger in the height direction to the box, the heat exchanger is more stably positioned in the box, thereby facilitating improving the stability of the battery device operation.

[0016] In some embodiments, the height direction of the heat exchange element is the up-down direction, and the bottom of the heat exchange element is bonded and fixed to the bottom plate of the box body.

[0017] In the above technical solution, the bottom of the heat exchange member is bonded and fixed to the bottom plate of the box body, so that the assembly of the battery cell is more convenient and the production efficiency of the battery device is improved.

[0018] In some embodiments, the flow channel cavity further has a medium inlet and a medium outlet, each of the medium inlet and the medium outlet and the connecting port are respectively located on different side cavity walls of the flow channel cavity, and the two connecting ports corresponding to a single heat exchange element are located on the same side or different sides of the heat exchange element.

[0019] In the above technical solution, each of the medium inlet and the medium outlet is located on a different side cavity wall of the flow channel cavity from the connecting port, so that the setting position of the medium inlet and the medium outlet is more flexible and convenient to adapt to different installation environments; the two connecting ports corresponding to a single heat exchanger are located on the same side or different sides of the heat exchanger, so that the setting position of the connecting ports is more flexible and convenient to improve the heat exchange efficiency of the heat exchanger and the battery cell.

[0020] In some embodiments, the medium inlet and the medium outlet are both located on a cavity wall of the flow channel cavity that faces away from the accommodating cavity.

[0021] In the above technical solution, the medium inlet, the medium outlet and the connecting port are respectively located on the two opposite side walls of the flow channel cavity, so that the flow path of the heat exchange medium in the flow channel cavity is clearer, which is convenient for improving the heat exchange efficiency.

[0022] In some embodiments, there are multiple heat exchange elements, and the multiple heat exchange elements are arranged in parallel between the medium inlet and the medium outlet.

[0023] In the above technical solution, multiple heat exchange elements arranged in parallel are used to exchange heat for multiple battery cells, thereby improving the heat exchange efficiency of the battery device.

[0024] In some embodiments, multiple heat exchange elements are arranged at intervals along the thickness direction of the heat exchange elements, the medium inlet is located on the same side of the multiple heat exchange elements in the thickness direction, the flow channel cavity includes a liquid inlet channel, and the heat exchange flow channel of each heat exchange element is connected to the liquid inlet channel; or, the flow channel cavity includes multiple liquid inlet channels, and the multiple liquid inlet channels are respectively connected to the medium inlet, and each liquid inlet channel corresponds to the heat exchange flow channel connected to at least one heat exchange element.

[0025] In the above technical solution, the heat exchange channel of each heat exchange element is connected to the same liquid inlet channel in the channel cavity, so that the heat exchange medium can flow smoothly into multiple heat exchange channels. At the same time, the structure of the channel cavity is relatively simple and convenient for processing and manufacturing; or, each liquid inlet channel corresponds to the heat exchange channel connected to at least one heat exchange element, so that the flow rate and temperature of the heat exchange medium in each heat exchange channel are relatively uniform, so that the heat exchange effect of the heat exchange element is more uniform, which is convenient for improving the thermal management performance of the battery device.

[0026] In some embodiments, at least a portion of the plurality of liquid inlet channels are spaced apart along a height direction of the heat exchange element.

[0027] In the above technical solution, at least part of the multiple liquid inlet channels are spaced apart along the height direction of the heat exchanger, so that the space occupied by the multiple liquid inlet channels in the thickness direction of the box body is reduced, thereby facilitating the miniaturization design of the battery device.

[0028] In some embodiments, in the height direction of the heat exchange element, the multiple connecting ports corresponding to the multiple liquid inlet channels are at the same height position.

[0029] In the above technical solution, the multiple communication ports are at the same height position, so that the processing and manufacturing of the communication ports is more convenient, which helps to improve the manufacturing efficiency of the box body.

[0030] In some embodiments, the box body includes a top plate, a bottom plate and a frame, the frame is connected between the top plate and the bottom plate, the frame is arranged around the bottom plate and defines a accommodating cavity with the bottom plate and the top plate, the flow channel cavity is arranged in the frame, and the connecting port is formed on the inner peripheral wall of the frame.

[0031] In the above technical solution, the accommodating chamber is defined by the frame, the bottom plate and the top plate, the flow channel chamber is arranged in the frame, and the connecting port is formed on the inner peripheral wall of the frame, so that the structure of the box body is relatively simple and convenient for processing and manufacturing. At the same time, the flow channel chamber and the accommodating chamber are connected only by the connecting port, which is convenient to reduce the possibility of leakage of the heat exchange medium in the flow channel chamber.

[0032] In some embodiments, the frame includes a plurality of side beams connected end to end in sequence, at least one side beam includes a mounting portion and a flow channel portion, the mounting portion is arranged on the side of the flow channel portion away from the accommodating cavity, the flow channel portion has a cavity, at least part of the cavity wall of the cavity participates in defining the cavity wall of the flow channel cavity; and / or, the cavity has a pipeline, and the pipeline participates in defining the cavity wall of the flow channel cavity.

[0033] In the above technical solution, the mounting portion is arranged on the side of the flow channel portion away from the accommodating cavity, so that the mounting portion is not easy to affect the normal operation of the flow channel portion when cooperating with other components; at least part of the cavity wall of the cavity participates in defining the cavity wall of the flow channel cavity, so as to make more full use of the space inside the frame, thereby facilitating the miniaturization design of the battery device; and / or, the pipeline in the cavity defines the cavity wall of the flow channel cavity, thereby simplifying the manufacturing process of the flow channel cavity and facilitating the maintenance of the flow channel cavity.

[0034] In some embodiments, the cavity wall on one side facing away from the accommodating cavity is spaced apart from the cavity wall on the other side facing away from the accommodating cavity; and / or, support ribs are provided in the cavity, and the two ends of the support ribs are respectively connected to the cavity walls on the opposite sides of the cavity in the radial direction of the frame, so as to divide the cavity into a plurality of spaced-apart chambers.

[0035] In the above technical solution, the cavity wall facing the flow channel portion is spaced apart from the cavity wall facing the flow channel portion, so that there is a certain vacant space between the cavity and the flow channel portion, which can absorb and disperse the stress caused by external impact or vibration, so that the heat exchange medium in the flow channel cavity works more stably; and / or, a support rib is provided in the cavity, and the two ends of the support rib are respectively connected to the cavity walls on the opposite sides of the cavity in the radial direction of the frame, so as to enhance the structural strength of the cavity, so that it can withstand greater pressure and stress, so that the heat exchange medium in the flow channel cavity works more stably.

[0036] In some embodiments, the side beam further includes an energy absorbing portion, which is connected between the mounting portion and the flow channel portion, and has at least one energy absorbing cavity therein.

[0037] In the above technical solution, the energy absorbing part can absorb the energy of the battery device when it is subjected to external impact or vibration, so as to improve the structural strength of the side beam, so that the flow channel part can have a more stable working effect.

[0038] In some embodiments, the side beam further includes an energy absorbing member, and the energy absorbing member is disposed in the energy absorbing cavity.

[0039] In the above technical solution, the energy absorbing member can undergo controllable deformation when impacted by external force, so that the energy absorbing member can more effectively absorb and disperse the impact energy, thereby increasing the service life of the side beam and making the battery device more stable during operation.

[0040] In some embodiments, the energy absorbing member includes a plurality of reinforcing ribs, which are arranged at intervals along the height direction of the heat exchange member, and the two ends of each reinforcing rib are respectively connected to the opposite side walls of the energy absorbing cavity in the radial direction of the frame, and the reinforcing ribs are inclined relative to the direction of the flow channel portion toward the mounting portion.

[0041] In the above technical solution, by arranging a plurality of reinforcing ribs at intervals along the height direction of the heat exchanger, the rigidity and stability of the energy absorption cavity and its surrounding structures can be enhanced. Moreover, the inclined arrangement of the reinforcing ribs enables it to more effectively absorb and disperse energy when impacted by external forces, thereby improving the impact resistance of the energy absorption component, so that the battery device is more stable during operation.

[0042] In some embodiments, the plurality of reinforcing ribs include at least one first reinforcing rib and at least one second reinforcing rib, each first reinforcing rib corresponds to a second reinforcing rib, and the first reinforcing rib and the corresponding second reinforcing rib are inclined in opposite directions and are cross-arranged.

[0043] In the above technical solution, the first reinforcing ribs and the second reinforcing ribs are cross-arranged in opposite inclined directions to form a stable grid structure, which can more effectively absorb and disperse energy, thereby facilitating improving the stability of the operation of the battery device.

[0044] In some embodiments, there are multiple energy absorption cavities which are sequentially arranged from the flow channel portion toward the mounting portion, and the reinforcing ribs corresponding to two adjacent energy absorption cavities are connected to the same position of the partition cavity wall between the two adjacent energy absorption cavities.

[0045] In the above technical solution, multiple energy absorption chambers are arranged in sequence along the direction of the flow channel portion toward the mounting portion, so that the impact energy can be gradually absorbed and dispersed by the multiple energy absorption chambers, and it is not easy to affect the normal operation of the flow channel portion; the reinforcing ribs corresponding to two adjacent energy absorption chambers are connected to the same position of the partition wall between the two adjacent energy absorption chambers, so that the structural strength of the adjacent energy absorption chambers is better, which is more conducive to dispersing the impact energy, making the battery device more stable during operation.

[0046] In a second aspect, an embodiment of the present application provides an electrical device, comprising the battery device of the first aspect.

[0047] In the above technical solution, since the battery device has good energy density, the battery device can be used to improve the endurance performance of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0049] Figure 1 A schematic diagram of an electrical device proposed in an embodiment of the present application;

[0050] Figure 2 for Figure 1 A schematic diagram of the battery device shown in;

[0051] Figure 3 A schematic diagram of a battery device proposed in an embodiment of the present application;

[0052] Figure 4 for Figure 3 Another schematic diagram of the battery device shown;

[0053] Figure 5 for Figure 3 A schematic diagram of a heat exchange element shown in ;

[0054] Figure 6 for Figure 3 Schematic diagram of the edge beam shown in;

[0055] Figure 7 for Figure 3 Another schematic diagram of the edge beam shown in .

[0056] Reference numerals: battery device 1, power device 2,

[0057] Box body 10, accommodating chamber 12, flow channel chamber 14, communication port 140, medium inlet 142, medium outlet 144, liquid inlet channel 146, first channel section 146a, second channel section 146b, bottom plate 16, top plate 17, frame 18, inner peripheral wall 180,

[0058] Battery cell 20, first wall 22,

[0059] Heat exchange element 30, heat exchange channel 32, bottom 34, first end 36, second end 38,

[0060] side beam 40, mounting portion 42, flow channel portion 44, cavity 440, pipeline 4402, support rib 4404, chamber 4406, energy absorbing portion 46, energy absorbing cavity 460, first energy absorbing cavity 460a, second energy absorbing cavity 460b, partition cavity wall 461, energy absorbing member 462, reinforcing rib 464, first reinforcing rib 464a, second reinforcing rib 464b,

[0061] A controller 50 , a motor 52 , a first housing 54 , and a second housing 56 . DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0063] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0064] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0065] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0066] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0067] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the sizes of the various components in the embodiments of the present application shown in the drawings are only exemplary and should not constitute any limitation to the present application.

[0068] The term “plurality” used in this application refers to two or more (including two).

[0069] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. The multiple battery cells of the battery device can be connected in series, in parallel or in mixed connection through a busbar. For example, the battery device mentioned in the present application can be a battery module or a battery pack, etc. The battery module is composed of multiple battery cells arranged and fixed to form an independent module. As an example, the battery module can be formed by bundling multiple battery cells with a cable tie; the battery pack generally includes a box for encapsulating one or more battery cells or one or more battery modules, and the box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells; of course, the battery device may not include a box.

[0070] As an example, the battery device is accommodated in the box by fixing the battery module in the box. As an example, the battery device can also be accommodated in the box by directly fixing a plurality of battery cells to the box.

[0071] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly; the closed here means covered or closed, which can be sealed or unsealed; the first box may be a top cover or a bottom plate. As an example, the box may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box to accommodate the battery cell.

[0072] In the embodiments of the present application, battery cells may include secondary batteries, primary batteries, etc. Secondary batteries refer to battery cells that can be used continuously by activating active materials by charging after the battery cells are discharged; battery cells may be lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, sodium-ion batteries or magnesium-ion batteries, etc., which are not limited in the embodiments of the present application. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., which are not limited in the embodiments of the present application. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which are not limited in the embodiments of the present application.

[0073] Exemplarily, a battery cell may generally include a shell, a bottom support plate, an electrode assembly and an electrolyte, wherein the shell is used to accommodate the electrode assembly and the electrolyte, and the shell is provided with at least one positive electrode column and at least one negative electrode column. The bottom support plate is placed in the shell, and the bottom support plate is located at one end of the electrode assembly to support the electrode assembly. The electrode assembly includes one or more electrode assemblies, and the electrode assembly is formed by stacking or winding a positive electrode sheet, a negative electrode sheet and a separator.

[0074] Among them, the positive electrode sheet can generally include a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is directly or indirectly coated on the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, the positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab sheet, and a plurality of positive electrode tab sheets are stacked together and electrically connected to the positive electrode column. Exemplarily, the plurality of stacked positive electrode tab sheets can be directly welded to the positive electrode column to form an electrical connection; or, the electrode assembly can also include a positive electrode adapter sheet, the plurality of stacked positive electrode tab sheets are welded to one end of the positive electrode adapter sheet, and the other end of the positive electrode adapter sheet is welded to the positive electrode column, so that the positive electrode tab sheet is electrically connected to the positive electrode column.

[0075] The negative electrode sheet can generally include a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is directly or indirectly coated on the negative electrode current collector, the negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, the negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab sheet, and a plurality of negative electrode tab sheets are stacked together and electrically connected to the negative electrode column. Exemplarily, a plurality of negative electrode tab sheets stacked together can be directly welded to the negative electrode column to form an electrical connection; or, the electrode assembly can also include a negative electrode adapter sheet, a plurality of negative electrode tab sheets stacked together are welded to one end of the negative electrode adapter sheet, and the other end of the negative electrode adapter sheet is welded to the negative electrode column, so that the negative electrode tab sheet is electrically connected to the negative electrode column. The material of the separator is not limited, for example, it can be polypropylene or polyethylene.

[0076] With the development of current society and the advancement of technology, the application of battery devices is becoming more and more extensive. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0077] During the use of the battery, the battery cells in the battery device will generate heat, and a heat exchanger is usually required to dissipate the heat from the battery cells. However, the communication port of the heat exchanger for receiving and discharging the heat exchange medium is arranged in the receiving cavity of the battery device, and a pipeline connected to the communication port is also arranged in the receiving cavity, which will occupy the space in the receiving cavity and affect the arrangement of the battery cells in the receiving cavity, thereby reducing the energy density of the battery device and being unfavorable to realizing the miniaturization design of the battery device.

[0078] Based on the above considerations, in order to improve the energy density of the battery device, an embodiment of the present application proposes a battery device, the battery device comprising: a box body, a battery cell and a heat exchanger, the box body is provided with a accommodating chamber and a flow channel chamber, the flow channel chamber has a connecting port on the cavity wall facing the accommodating chamber, the battery cell is accommodated in the accommodating chamber, the heat exchanger is accommodated in the accommodating chamber, and the heat exchanger cooperates with the battery cell in thermal conductivity, the heat exchanger has a heat exchange channel, the heat exchanger is fixedly connected to the box body and sealed at the connecting port to separate the accommodating chamber and the flow channel chamber, and the heat exchange channel is connected with the flow channel chamber through the connecting port.

[0079] In the above technical solution, a connecting port is provided on the cavity wall of the flow channel cavity facing the accommodating cavity, and the heat exchange component is fixedly connected to the box body and sealed at the connecting port, so that the heat exchange medium in the flow channel cavity can take away the heat generated by the battery cell through the heat exchange flow channel, and can more fully utilize the space of the flow channel cavity, so that the connecting port does not occupy additional space in the accommodating cavity, and the connecting port is not easy to affect the arrangement of the battery cell in the accommodating cavity, which is convenient for improving the energy density of the battery device and is conducive to realizing the miniaturized design of the battery device.

[0080] The embodiment of the present application provides an electric device using the present disclosure, the electric device includes the above-mentioned battery cell, the above-mentioned battery device, the above-mentioned energy storage device or the above-mentioned energy storage system, the electric device using the battery cell or the battery device as a power source, and the electric device can be but is not limited to a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy and an electric airplane toy, etc., the spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft, etc., the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc.

[0081] For the convenience of explanation, the following embodiments take the electric device 2 as a vehicle as an example, and describe in detail the structures of the electric device 2, the battery device 1 and the battery cell 20 of the present application.

[0082] Please refer to Figure 1 , Figure 1 The power-consuming device 2 provided for some embodiments of the present application is a structural schematic diagram of a vehicle. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The vehicle is provided with a battery device 1, and the battery device 1 may be arranged at the bottom, head or tail of the vehicle. The battery device 1 may be used to power the vehicle, for example, the battery device 1 may be used as an operating power source for the vehicle. The vehicle may also include a controller 50 and a motor 52, and the controller 50 is used to control the battery device 1 to power the motor 52, for example, for the starting, navigation and working power requirements of the vehicle during driving. In some embodiments of the present application, the battery device 1 can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0083] Please refer to Figure 2 , Figure 2The battery cell 20 provided in some embodiments of the present application is used for the structural explosion diagram of the battery device 1. The battery device 1 includes a case 10 and a plurality of battery cells 20, and the battery cells 20 are accommodated in the case 10. Among them, the case 10 is used to provide an assembly space for the battery cells 20, and the case 10 can adopt a variety of structures. In some embodiments, the case 10 may include a first case 54 and a second case 56, and the first case 54 and the second case 56 cover each other, and the first case 54 and the second case 56 jointly define a accommodating cavity 12 for accommodating the battery cells 20. The second case 56 may be a hollow structure with one end open, and the first case 54 may be a plate-like structure, and the first case 54 covers the open side of the second case 56, so that the first case 54 and the second case 56 jointly define the accommodating cavity 12; or, the first case 54 and the second case 56 may also be hollow structures with one side open (for example Figure 2 As shown in FIG. 1 ), the open side of the first box body 54 is covered with the open side of the second box body 56. Of course, the box body 10 formed by the first box body 54 and the second box body 56 can be in various shapes, such as a cylinder or a cuboid.

[0084] In the battery device 1, multiple battery cells 20 can be connected in series, in parallel or in a mixed connection. A mixed connection means that multiple battery cells 20 are connected in series and in parallel. Multiple battery cells 20 can be directly connected in series, in parallel or in a mixed connection, and then the whole formed by multiple battery cells 20 is accommodated in the box 10; or, the battery device 1 can also be a battery module formed by multiple battery cells 20 connected in series, in parallel or in a mixed connection, and then multiple battery modules are connected in series, in parallel or in a mixed connection to form a whole, and accommodated in the box 10. The battery device 1 can also include other structures, for example, the battery device 1 can also include a busbar for realizing electrical connection between multiple battery cells 20.

[0085] Please refer to Figure 3-Figure 5 In the embodiment of the present application, the battery device 1 includes: a box body 10, a battery cell 20 and a heat exchanger 30. The box body 10 has a accommodating chamber 12 and a flow channel chamber 14. The flow channel chamber 14 has a connecting port 140 on the side wall facing the accommodating chamber 12. The battery cell 20 is accommodated in the accommodating chamber 12, and the heat exchanger 30 is accommodated in the accommodating chamber 12. The heat exchanger 30 and the battery cell 20 are heat-conductively matched. The heat exchanger 30 has a heat exchange channel 32. The heat exchanger 30 is fixedly connected to the box body 10, and the heat exchanger 30 and the box body 10 are sealed and connected at the connecting port 140 to separate the accommodating chamber 12 and the flow channel chamber 14, and the heat exchange channel 32 is connected to the flow channel chamber 14 through the connecting port 140.

[0086] It can be seen that the battery cell 20 is accommodated in the accommodating cavity 12, which provides a relatively stable environment for the operation of the battery cell 20 and is not easily disturbed by the external environment; the heat exchange component 30 cooperates with the heat conduction of the battery cell 20, which can effectively transfer the heat generated by the battery cell 20 to the heat exchange component 30, and / or, the battery cell 20 can be heated by the heat exchange medium, so that the battery cell 20 can operate within a safe operating temperature range, thereby extending the service life of the battery cell 20; the heat exchange component 30 and the box body 10 are sealed at the connecting port 140, which realizes that the heat exchange flow channel 32 passes through the connecting port 14 0 is connected to the flow channel cavity 14, and the heat exchange medium (such as liquid or gas) in the flow channel cavity 14 can flow into the heat exchange flow channel 32 through the connecting port 140, thereby absorbing and taking away the heat generated by the battery cell 20, and / or transferring heat to the battery cell 20, so as to achieve efficient cooling and / or heating of the battery cell 20, and at the same time, the separation of the accommodating cavity 12 and the flow channel cavity 14 is achieved, and the heat exchange medium in the flow channel cavity 14 and the heat exchange flow channel 32 is not easy to flow into the accommodating cavity 12, so as to separate the heat exchange medium from the battery cell 20, and reduce the risk of short circuit and ignition of the battery device 1 caused by the heat exchange medium flowing into the accommodating cavity 12. For example, when the heat exchange medium is liquid, the above arrangement can achieve liquid-electric separation.

[0087] Obviously, the heat exchange member 30 separates the accommodating chamber 12 from the flow channel chamber 14, so that the heat exchange medium in the flow channel chamber 14 is not easy to leak into the accommodating chamber 12, thereby affecting the normal operation of the battery cell 20. In other words, the heat exchange medium in the flow channel chamber 14 can only flow into the heat exchange flow channel 32 through the connecting port 140, and will not directly contact the battery cell 20, thereby improving the stability of the operation of the battery cell 20.

[0088] In addition, a connecting port 140 is provided on the cavity wall of the flow channel cavity 14 on one side facing the accommodating cavity 12, and the heat exchange component 30 is fixedly connected to the housing 10 and the heat exchange component 30 and the housing 10 are sealed at the connecting port 140. Then, the connection point between the heat exchange component 30 and the flow channel cavity 14 is located on the cavity wall of one side of the flow channel cavity 14, or it can be simply understood that the interface of the heat exchange flow channel 32 is connected to the housing 10. Compared with some technologies, the interface of the heat exchange flow channel in the heat exchange component is spaced apart from the housing, and a pipeline is additionally provided in the housing, which is connected to the interface of the heat exchange flow channel. The pipeline will occupy the layout space in the housing, affecting the layout of the battery cells and reducing the housing to provide space for the battery cells. The space provided for arrangement results in a low energy density of the battery device, which is not conducive to the miniaturization design of the battery device. The above-mentioned arrangement of the present application fixes the heat exchange component 30 to the box body 10 and connects the heat exchange channel 31 with the channel cavity 14 inside the box body 10. There is no need to separately set up a pipeline connected to the heat exchange component 30 in the accommodating cavity 12. The space of the box body 10 corresponding to the channel cavity 14 can be more fully utilized, and no additional space will be occupied in the accommodating cavity 12. It is not easy to affect the arrangement of the battery cell 20 in the accommodating cavity 12, which is convenient for improving the energy density of the battery device 1 and is conducive to the miniaturization design of the battery device 1.

[0089] Moreover, the provision of the flow channel cavity 14 can not only provide a larger accommodation space for the heat exchange medium to improve the thermal management capability of the battery cell 20, but also help to reduce the weight of the box body 10 to a certain extent while ensuring the structural reliability of the box body 10, which is beneficial to further improve the energy density of the battery device 1.

[0090] Optionally, the battery cell 20 directly abuts against the heat exchange element 30 to achieve thermal coordination between the battery cell 20 and the heat exchange element 30; or the battery cell 20 indirectly abuts against the heat exchange element 30, for example, the battery cell 20 abuts against the heat exchange element 30 through a heat conductive element (such as thermal conductive glue, etc.), which can also achieve heat transfer between the battery cell 20 and the heat exchange element 30.

[0091] Please refer to Figure 3 In some embodiments, the heat exchange component 30 and the housing 10 are welded and fixed at the connecting port 140. By welding and fixing the heat exchange component 30 and the housing 10 at the connecting port 140, the setting position of the heat exchange component 30 is more stable and is not easily loosened or displaced due to external impact or vibration. This can not only improve the connection reliability between the heat exchange component 30 and the housing 10, but also enable the heat exchange component 30 to be stably sealed at the connecting port 140, thereby reducing the possibility of leakage at the connecting port 140, which is beneficial to further reduce the risk of heat exchange medium flowing into the accommodating chamber 12 and causing short circuit and ignition of the battery device 1, thereby improving the stability of the operation of the battery device 1.

[0092] In addition, if the two connecting ports 140 corresponding to the heat exchanger 30 are respectively located at the two ends of the length of the heat exchanger 30, the two ends of the length of the heat exchanger 30 are respectively fixed to the box body 10, which can increase the structural strength of the battery device 1 and reduce the setting of additional structures inside the box body 10, such as side panels, beams, etc., which is beneficial to improve the utilization of the internal space of the box body 10.

[0093] Please refer to Figure 2 and Figure 3 In some embodiments, the battery cell 20 includes a first wall 22, which is the wall with the largest area in the battery cell 20. The first wall 22 can be understood as the "large surface" of the battery cell 20. The heat exchange element 30 cooperates with the first wall 22 for thermal conductivity. The heat exchange element 30 cooperates with the wall with the largest area in the battery cell 20 for thermal conductivity, which is convenient for increasing the heat exchange area between the heat exchange element 30 and the battery cell 20, so that the heat exchange element 30 can more effectively absorb and transfer the heat generated by the battery cell 20, which is beneficial to the heat exchange of the battery cell 20 and ensures the performance of the battery device 1. For example, when the temperature of the battery cell 20 is too high, the heat exchange element 30 can cool the battery cell 20 to reduce the temperature of the battery cell 20. When the temperature of the battery cell 20 is too low, the heat exchange element 30 can heat the battery cell 20 to increase the temperature of the battery cell 20.

[0094] Please refer to Figure 2 and Figure 3 In some embodiments, the heat exchange element 30 is fixedly connected to the first wall 22. By fixing the heat exchange element 30 to the first wall 22, the heat exchange element 30 is fixedly connected to the box body 10, so that the heat exchange element 30, the battery cell 20 and the box body 10 can form a stable structure, which is convenient for improving the ability of the battery device 1 to resist external impact and vibration, and makes the thermal conductivity cooperation between the heat exchange element 30 and the battery cell 20 more stable, which is convenient for improving the stability of the operation of the battery device 1.

[0095] It can be understood that when the heat exchange component 30 cooperates with multiple battery cells 20 for thermal conductivity, the heat exchange component 30 can connect the multiple battery cells 20 into a whole. In this case, the arrangement of side panels, beams and other structures in the box body 10 can be reduced, which can greatly improve the space utilization inside the box body 10 and improve the energy density of the battery device 1.

[0096] Please refer to Figure 3 and Figure 5 In some embodiments, the heat exchange element 30 is a plate-shaped structure, and the heat exchange element 30 is Figure 3 At least one of the two ends in the AA' direction in the heat exchanger 30 corresponds to the communication port 140, and at least one of the two ends in the length direction of the heat exchanger 30 is fixedly connected to the box body 10, and the heat exchanger 30 in the thickness direction (such as Figure 3 At least one of the two side walls (in the BB′ direction) is thermally coordinated with the battery cell 20.

[0097] It can be seen that the plate-shaped heat exchanger 30 has a relatively simple structure, is easy to process and manufacture, and is conducive to improving production efficiency; at least one of the two ends of the heat exchanger 30 in the length direction corresponds to a connecting port 140, so that the setting position of the connecting port 140 is more flexible, which is convenient for adapting to different installation environments of the battery device 1, and at least one of the two ends of the heat exchanger 30 in the length direction is fixedly connected to the box 10, so that the setting position of the heat exchanger 30 in the box 10 is more stable, which is convenient for improving the working stability of the battery device 1. It can be understood that one of the two ends of the heat exchanger 30 in the length direction has a connecting port 140, and the end of the heat exchanger 30 in the length direction with the connecting port 140 is fixed to the box 10, or, both ends of the heat exchanger 30 in the length direction are fixed to the box 10; or, both ends of the heat exchanger 30 in the length direction have connecting ports 140, and both ends of the heat exchanger 30 in the length direction are fixed to the box 10.

[0098] Exemplarily, the two ends of the heat exchanger 30 in the length direction thereof are respectively a first end 36 and a second end 38, the first end 36 of the heat exchanger 30 is connected to the corresponding connecting port 140, and the first end 36 of the heat exchanger 30 is fixedly connected to the housing 10, and the second end 38 of the heat exchanger 30 is not fixedly connected to the housing 10, so that after the heat exchange medium flows into the heat exchange channel 32 through the connecting port 140, the heat exchange medium forms a U-shaped flow path in the heat exchange channel 32. Alternatively, the first end 36 and the second end 38 of the heat exchanger 30 are respectively connected to the corresponding connecting port 140, and the first end 36 and the second end 38 of the heat exchanger 30 are both fixedly connected to the housing 10, so that after the heat exchange medium flows into the heat exchange channel 32 through the connecting port 140, the heat exchange medium forms a linear flow path in the heat exchange channel 32.

[0099] In addition, at least one of the two side walls of the heat exchanger 30 in the thickness direction is thermally coordinated with the battery cell 20, so that the location of the heat exchanger 30 is more flexible and the space utilization rate in the battery device 1 can be improved. For example, the heat exchanger 30 is located between two battery cells 20, so that the two side walls of the heat exchanger 30 in the thickness direction are thermally coordinated with different battery cells 20, which is convenient for improving the space utilization rate in the battery device 1; optionally, the heat exchanger 30 is thermally coordinated with a row of battery cells on the same side in the thickness direction, and the battery cell includes one or more battery cells, and multiple heat exchangers 30 and multiple rows of battery cells are alternately arranged one by one along the thickness direction of the heat exchanger 30.

[0100] In some embodiments, at least one of the two ends of the heat exchanger 30 in the height direction is fixedly connected to the housing 10. Figure 6At least one of the two ends on the CC' direction in the heat exchanger 30 is fixedly connected to the housing 10, so that the setting position of the heat exchanger 30 in the housing 10 is more stable, which can effectively reduce the possibility of displacement or shaking of the heat exchanger 30 due to factors such as fluid flow, temperature change or external vibration during operation, ensure the high efficiency and stability of the heat exchange process between the heat exchanger 30 and the battery cell 20, and facilitate improving the stability of the operation of the battery device 1.

[0101] In some embodiments, the height direction of the heat exchange member 30 is the up-down direction, and the bottom 34 of the heat exchange member 30 is bonded and fixed to the bottom plate 16 of the box body 10, so that the setting position of the heat exchange member 30 in the box body 10 is more stable, and it is convenient to assemble the battery cells 20, which can improve the production efficiency of the battery device 1. For example, the box body 10 includes a top plate 17, a bottom plate 16 and a frame 18, and the heat exchange member 30 can be bonded to the bottom plate 16 of the box body 10 and welded and fixed to the frame 18, and then a plurality of battery cells 20 are assembled in the box body 10, and after the assembly is completed, the top plate 17 is installed, so that the battery cells 20 are in a relatively stable working environment.

[0102] Please refer to Figure 3 In some embodiments, the flow channel cavity 14 further has a medium inlet 142 and a medium outlet 144, and each of the medium inlet 142 and the medium outlet 144 and the connecting port 140 are respectively located on different side cavity walls of the flow channel cavity 14, and the two connecting ports 140 corresponding to a single heat exchange element 30 are located on the same side or different sides of the heat exchange element 30.

[0103] It can be seen that the heat exchange medium can flow into the flow channel cavity 14 through the medium inlet 142, and flow into the heat exchange flow channel 32 through the connecting port 140 to exchange heat with the battery cell 20. The heat exchange medium after heat exchange flows out through the medium outlet 144 to realize the circulation of the heat exchange medium; and each of the medium inlet 142 and the medium outlet 144 and the connecting port 140 are respectively located on different side walls of the flow channel cavity 14, so that the external structures at the medium inlet 142 and the medium outlet 144, such as joints, pipes, etc., will not occupy additional space in the accommodating cavity 12, so that the medium inlet 142 and the medium outlet 144 are not likely to affect the arrangement of the battery cell 20 in the accommodating cavity 12, so that the battery cell 20 can more fully utilize the space in the accommodating cavity 12, which is convenient for realizing the miniaturized design of the battery device 1, and the assembly connection between the medium inlet 142 and the medium outlet 144 and the corresponding external structure is not easily restricted by the accommodating cavity 12, which is convenient for realizing the above operation outside the accommodating cavity 12, providing a larger operating space for the external structure, facilitating assembly, and improving the applicability of the battery device 1.

[0104] In addition, the two connecting ports 140 corresponding to a single heat exchanger 30 are located on the same side or different sides of the heat exchanger 30, so that the setting position of the connecting ports 140 is more flexible and convenient for improving the heat exchange efficiency of the heat exchanger 30 and the battery cell 20. For example, when the two connecting ports 140 corresponding to a single heat exchanger 30 are located on different sides of the heat exchanger 30, it can be ensured that the heat exchange medium forms a more direct flow path when flowing through the heat exchange flow channel 32, which helps to quickly take away heat and improve the heat exchange efficiency; when the two connecting ports 140 are located on the same side of the heat exchanger 30, the cooling medium may need to make a certain degree of turning or circuitous flow inside the heat exchanger 30. This design increases the contact time and area of ​​the heat exchange medium, which also helps to improve the heat exchange efficiency.

[0105] It can be understood that, of the two communication ports 140 corresponding to a single heat exchange element 30 , one can be communicated with the inlet of the heat exchange channel 32 , and the other can be communicated with the outlet of the heat exchange channel 32 .

[0106] Of course, in other embodiments, the flow channel cavity 14 may not have the medium inlet 142 and the medium outlet 144 .

[0107] Please refer to Figure 3 In some embodiments, the medium inlet 142 and the medium outlet 144 are both located on the side wall of the flow channel cavity 14 facing away from the accommodating cavity 12, and the connecting port 140 is located on the side wall of the flow channel cavity 14 facing the accommodating cavity 12. Then, the medium inlet 142 and the medium outlet 144 and the connecting port 140 are respectively located on different side walls of the flow channel cavity 14. For example, the connecting port 140 is located on the inner side wall of the flow channel cavity 14, and the inner side wall can participate in defining the accommodating cavity 12. The medium inlet 142 and the medium outlet 144 are located on the outer side wall of the flow channel cavity 14, so that when other components are subsequently connected to the medium inlet 142 and the medium outlet 144, The medium inlet 142 and the medium outlet 144 are not likely to affect the assembly of the various parts of the box body 10. For example, the box body 10 includes a first box body 54 and a second box body 56. The medium inlet 142 and the medium outlet 144 can be located on the outer peripheral side wall of the first box body 54 or the second box body 56, so that the medium inlet 142 and the medium outlet 144 are not likely to affect the arrangement of the various components in the accommodating cavity 12 (such as the battery cell 20 and the heat exchange element 30), and are not likely to affect the covering of the first box body 54 and the second box body 56, so as to improve the applicability of the battery device 1.

[0108] Please refer to Figure 3 In some embodiments, there are multiple heat exchange elements 30 , and the multiple heat exchange elements 30 are arranged in parallel between the medium inlet 142 and the medium outlet 144 .

[0109] It can be seen that by using multiple heat exchangers 30 arranged in parallel to exchange heat between multiple battery cells 20, the thermal management efficiency of the battery device 1 can be significantly improved. Each heat exchanger 30 can independently exchange heat with the corresponding battery cell 20, ensuring that each battery cell 20 can be fully cooled or heated, and is conducive to reducing the temperature difference of the heat exchange medium flowing to the multiple heat exchangers 30, thereby maintaining the temperature uniformity of the entire battery device 1. It can be understood that the heat exchangers 30 arranged in parallel mean that the heat exchange medium can be distributed to multiple heat exchange channels 32 after entering through the medium inlet 142, and at the same time, the heat exchange medium can be gathered to the medium outlet 144 after passing through the multiple heat exchange channels 32 for heat exchange.

[0110] Please refer to Figure 3 In some embodiments, a plurality of heat exchange elements 30 are arranged at intervals along the thickness direction of the heat exchange elements 30, and the medium inlet 142 is located on the same side of the plurality of heat exchange elements 30 in the thickness direction. The flow channel cavity 14 includes a liquid inlet channel 146, and the heat exchange channel 32 of each heat exchange element 30 is connected to the liquid inlet channel 146; or Figure 6 As shown, the flow channel cavity 14 includes a plurality of liquid inlet flow channels 146 , and the plurality of liquid inlet flow channels 146 are respectively connected to the medium inlet 142 , and each liquid inlet flow channel 146 is correspondingly connected to the heat exchange flow channel 32 of at least one heat exchange element 30 .

[0111] It can be seen that when there is one liquid inlet flow channel 146, the heat exchange flow channel 32 of each heat exchange element 30 is connected to the liquid inlet flow channel 146, and the heat exchange medium at the medium inlet 142 can be smoothly distributed and flowed into multiple heat exchange flow channels 32 through the liquid inlet flow channel 146, so that each heat exchange element 30 can obtain sufficient heat exchange capacity, thereby improving the thermal management efficiency of the battery device 1. At the same time, the structure of the flow channel cavity 14 is relatively simple, which is convenient for processing and manufacturing, and helps to improve the production efficiency of the battery device 1; or, when there are multiple liquid inlet flow channels 146, each liquid inlet flow channel 146 corresponds to the heat exchange flow channel 32 connected to at least one heat exchange element 30, and the heat exchange medium at the medium inlet 142 can be distributed to multiple liquid inlets. In the flow channel 146, the heat exchange medium in each liquid inlet flow channel 146 can be distributed to the heat exchange flow channel 32 connected thereto. Since the medium inlet 142 is located on the same side of the plurality of heat exchange elements 30 in the thickness direction, compared to the case where there is only one liquid inlet flow channel 146, the above arrangement can reduce the difference in flow rate and temperature of the heat exchange medium in the plurality of liquid inlet flow channels 146, and is beneficial to reducing the difference in flow rate (or flow velocity) and temperature of the heat exchange medium between the heat exchange flow channel 32 closest to the medium inlet 142 and the heat exchange flow channel 32 farthest from the medium inlet 142, so as to make the heat exchange capacity of the plurality of heat exchange elements 30 more balanced, which is beneficial to improve the overall heat exchange efficiency and facilitate the improvement of the thermal management performance of the battery device 1. It can be understood that each liquid inlet flow channel 146 can be connected to the heat exchange flow channels 32 of one or more heat exchange elements 30, so as to make the flow rate and temperature of the heat exchange medium in each heat exchange flow channel 32 more uniform, for example, the number of heat exchange elements 30 connected to the plurality of liquid inlet flow channels 146 is equal, for example Figure 6 In the example, each liquid inlet channel 146 corresponds to a heat exchange channel connected to three heat exchange elements 30 .

[0112] Please refer to Figure 6 In some embodiments, at least a portion of the plurality of liquid inlet channels 146 are spaced apart along a height direction of the heat exchange element 30 .

[0113] It can be seen that by arranging at least part of the multiple liquid inlet channels 146 at intervals along the height direction of the heat exchanger 30, the space of the box body 10 in the height direction can be more fully utilized, so that the space occupied by the multiple liquid inlet channels 146 in the thickness direction of the box body 10 is reduced, which is convenient for the subsequent arrangement of other components (such as the mounting part 42 and the energy absorption part 46 described later), and is conducive to realizing the miniaturized design of the battery device 1.

[0114] For example, Figure 6As shown, the liquid inlet channel 146 includes a first channel section 146a and a second channel section 146b. The first channel section 146a is bent and connected to the medium inlet 142 and the second channel section 146b. One end of the second channel section 146b is connected to the first channel section 146a, and the other end is connected to the corresponding connecting port 140, so that the multiple second channel sections 146b are spaced apart along the height direction of the heat exchange element 30, so that the multiple liquid inlet channels 146 can more fully utilize the space of the box body 10 in the height direction.

[0115] Please refer to Figure 6 In some embodiments, in the height direction of the heat exchanger 30, the multiple communication ports 140 corresponding to the multiple liquid inlet channels 146 are at the same height. Since the multiple communication ports 140 are at the same height, the multiple communication ports 140 have good position consistency, and there is no need to adjust the equipment separately for each communication port 140 during the processing, which is conducive to improving the processing efficiency, and at the same time, it is conducive to reducing the positioning error and reducing the manufacturing cost of the box 10.

[0116] Please refer to Figure 2 and Figure 3 In some embodiments, the box body 10 includes a top plate 17, a bottom plate 16 and a frame 18. The frame 18 is connected between the top plate 17 and the bottom plate 16. The frame 18 is arranged around the bottom plate 16 and the frame 18, the bottom plate 16 and the top plate 17 define a accommodating cavity 12. Through the combination of the top plate 17, the bottom plate 16 and the frame 18, a closed and stable box body 10 structure is formed. The structure is relatively simple and easy to process and manufacture. In addition, the box body 10 can withstand certain external forces and pressures to make the battery cell 20 more stable in the accommodating cavity 12.

[0117] Among them, the flow channel cavity 14 is arranged in the frame 18, and the flow channel cavity 14 can be arranged around the accommodating cavity 12. The connecting port 140 is formed on the inner peripheral wall 180 of the frame 18. The flow channel cavity 14 and the accommodating cavity 12 are connected only through the connecting port 140, which is convenient for reducing the risk of leakage of the heat exchange medium in the flow channel cavity 14 and the possibility of affecting the battery cell 20 arranged in the accommodating cavity 12, which helps to improve the stability of the operation of the battery device 1.

[0118] It can be understood that in the embodiment of the present application, the extension shape of the flow channel cavity 14 is not specifically limited. For example, the flow channel cavity 14 can be extended into an open ring shape (such as U-shape, C-shape, L-shape).

[0119] Please refer to Figure 3 and Figure 7In some embodiments, the frame 18 includes a plurality of side beams 40 connected end to end in sequence, at least one side beam 40 includes a mounting portion 42 and a flow channel portion 44, the mounting portion 42 is disposed on a side of the flow channel portion 44 away from the accommodating cavity 12, and the flow channel portion 44 has a cavity 440. Among them, at least part of the cavity wall of the cavity 440 participates in defining the cavity wall of the flow channel cavity 14; and / or, in combination Figure 7 The cavity 440 has a pipeline 4402 therein, and the pipeline 4402 helps to define the cavity wall of the flow channel cavity 14.

[0120] It can be seen that the mounting portion 42 can carry and fix the battery device 1 to achieve the installation of the battery device 1. By integrating the mounting portion 42 and the flow channel portion 44 on the same side beam 40, the compactness and integration of the structure of the box body 10 are achieved, which facilitates the miniaturization design of the battery device 1. The mounting portion 42 is arranged on the side of the flow channel portion 44 away from the accommodating chamber 12, so that the mounting portion 42 is not easy to affect the normal operation of the flow channel portion 44 when cooperating with other components, thereby improving the stability of the operation of the flow channel portion 44. At least part of the cavity wall of the cavity 440 participates in defining the cavity wall of the flow channel cavity 14, and the heat exchange medium in the flow channel cavity 14 can directly contact with the above-mentioned at least part of the cavity wall of the cavity 440, so as to make more full use of the space inside the frame 18, simplify the structure of the battery device 1, and facilitate the miniaturization design of the battery device 1; and / or, the pipeline 4402 in the cavity 440 participates in defining the cavity wall of the flow channel cavity 14, and the heat exchange medium in the flow channel cavity 14 can directly contact with the pipeline 4402, which can optimize the flow path of the heat exchange medium, reduce the resistance and energy loss of the heat exchange medium during the flow process, and facilitate the simplification of the manufacturing process of the flow channel cavity 14. In addition, the flow channel cavity 14 defined by the pipeline 4402 is more convenient for maintenance, reducing the complex maintenance operations. For example, the user can maintain the flow channel cavity 14 by replacing the pipeline 4402, thereby improving the maintenance efficiency.

[0121] Exemplarily, the cavity 440 is the flow channel cavity 14, and the cavity wall of the cavity 440 is the cavity wall of the flow channel cavity 14, and the connecting port 140 is formed on the cavity wall of the cavity 440 facing the accommodating cavity 12; or, the pipeline 4402 defines the cavity wall of the flow channel cavity 14, and the internal space of the pipeline 4402 is the flow channel cavity 14; or, the cavity wall of the cavity 440 and the pipeline 4402 cooperate to jointly define the flow channel cavity 14. Taking the cross-section of the flow channel cavity 14 as a quadrilateral as an example, the cavity wall of the cavity 440 can define one side of the above-mentioned quadrilateral, and the pipeline 4402 can define the remaining three sides of the above-mentioned quadrilateral.

[0122] Please refer to Figure 3 and Figure 7In some embodiments, the side wall of the cavity 440 facing away from the accommodating cavity 12 is spaced from the side wall of the flow channel cavity 14 facing away from the accommodating cavity 12. For example, the cavity 440 has a pipeline 4402, and the end surface of the pipeline 4402 facing the mounting portion 42 is spaced from the side wall of the cavity 440 facing the mounting portion 42. For another example, the cavity 440 has a partition, which is opposite to and spaced from the connecting port 140, and the partition participates in defining the cavity wall of the flow channel cavity 14. The cavity 440 has a pipeline 4402, and the end surface of the pipeline 4402 facing the mounting portion 42 is spaced from the side wall of the cavity 440 facing the mounting portion 42. 40 is provided with a cavity wall on one side facing away from the accommodating cavity 12 and spaced apart from the partition; and / or, a supporting rib 4404 is provided in the cavity 440, and two ends of the supporting rib 4404 are respectively connected to the cavity walls on two opposite sides of the cavity 440 in the radial direction of the frame 18, so as to divide the cavity 440 into a plurality of spaced apart chambers 4406, for example, two ends of the supporting rib 4404 are respectively connected to the cavity wall on one side facing away from the accommodating cavity 12 and the cavity wall on one side facing the accommodating cavity 12.

[0123] It can be seen that the cavity wall of the cavity 440 on the side away from the accommodating cavity 12 is spaced from the cavity wall of the flow channel cavity 14 on the side away from the accommodating cavity 12, so that an empty space is provided between the above two cavity walls. When the battery device 1 is subjected to external side impact or vibration, the empty space can undergo a certain deformation, absorb and disperse the stress caused by the external impact or vibration, reduce the impact and force transmitted to the flow channel cavity 14, reduce the deformation of the flow channel cavity 14, and is not easy to affect the normal operation of the heat exchange medium in the flow channel cavity 14, so that the heat exchange medium in the flow channel cavity 14 works more stably, which is convenient for improving the stability of the operation of the battery device 1; and / or, a support is provided in the cavity 440 The support rib 4404 has two ends respectively connected to the cavity walls of the cavity 440 on the radial direction of the frame 18 on opposite sides, so as to divide the cavity 440 into a plurality of chambers 4406 arranged at intervals. The arrangement of the support rib 4404 will not affect the connectivity of the cavity 440, and is convenient for enhancing the structural strength and stability of the cavity 440, so that when the battery device 1 is subjected to external impact or vibration, the support rib 4404 can resist the impact and vibration, and can also reduce the impact and force transmitted to the flow channel cavity 14, reduce the deformation of the flow channel cavity 14, and is not easy to affect the normal operation of the flow channel cavity 14, so as to make the heat exchange medium in the flow channel cavity 14 work more stably.

[0124] Exemplarily, the support ribs 4404 divide the cavity 440 into a plurality of chambers 4406 arranged at intervals, so that the heat exchange medium in the flow channel cavity 14 can flow to different heat exchange components 30, making the flow path of the heat exchange medium more clear. For example, at least two of the plurality of chambers 4406 can be formed as liquid inlet channels 146, respectively, and the number of chambers 4406 can be greater than or equal to the number of liquid inlet channels 146, and the cavity 440 can have a plurality of liquid inlet channels 146, each of which is connected to the heat exchange channel of at least one heat exchange component 30, so that the heat exchange medium at the medium inlet 142 is distributed to the plurality of heat exchange components 30 through the plurality of liquid inlet channels 146.

[0125] It is understood that the support rib 4404 may be one or more. Figure 7 In the example, a plurality of support ribs 4404 are arranged at intervals along the height direction of the heat exchanger 30 , and a plurality of chambers 4406 are arranged at intervals along the height direction of the heat exchanger 30 .

[0126] Please refer to Figure 7 In some embodiments, the side beam 40 further includes an energy absorbing portion 46 , which is connected between the mounting portion 42 and the flow channel portion 44 , and has at least one energy absorbing cavity 460 therein.

[0127] It can be seen that the energy absorption part 46 is connected between the mounting part 42 and the flow channel part 44, and the mounting part 42 can cooperate with other components. When the battery device 1 is subjected to external impact or vibration, the energy absorption cavity 460 can effectively reduce the possibility that the energy of the external impact or vibration affects the flow channel part 44, thereby facilitating the improvement of the structural stability of the flow channel part 44, so that the flow channel part 44 has a more stable working effect.

[0128] Please refer to Figure 7 In some embodiments, the side beam 40 further includes an energy absorbing member 462, which is disposed in the energy absorbing cavity 460. When the battery device 1 is subjected to external impact or vibration, the energy absorbing member 462 may be partially deformed so that the energy absorbing member 462 may more effectively absorb and disperse the impact energy, making it less likely for external impact and vibration to affect the normal operation of the flow channel portion 44, thereby increasing the service life of the side beam 40 and making the battery device 1 more stable during operation.

[0129] Please refer to Figure 7 In some embodiments, the energy absorbing member 462 includes a plurality of reinforcing ribs 464, and the plurality of reinforcing ribs 464 are spaced apart along the height direction of the heat exchange member 30, and the two ends of each reinforcing rib 464 are respectively connected to the cavity walls on opposite sides of the energy absorbing cavity 460 in the radial direction of the frame 18, and the reinforcing ribs 464 are inclined relative to the direction of the self-flow channel portion 44 toward the mounting portion 42.

[0130] It can be seen that by arranging a plurality of reinforcing ribs 464 at intervals along the height direction of the heat exchange component 30, the rigidity and stability of the energy absorbing cavity 460 and its surrounding structures can be enhanced, so that the structure of the side beam 40 is more stable, and the inclined arrangement of the reinforcing ribs 464 enables it to more effectively absorb and disperse energy when impacted by external forces, thereby improving the impact resistance of the energy absorbing component 462, making it less likely for external impacts and vibrations to affect the normal operation of the flow channel portion 44, so that the battery device 1 is more stable during operation.

[0131] Please refer to Figure 7 In some embodiments, the plurality of reinforcing ribs 464 include at least one first reinforcing rib 464a and at least one second reinforcing rib 464b, each first reinforcing rib 464a corresponds to a second reinforcing rib 464b, and the first reinforcing rib 464a and the corresponding second reinforcing rib 464b are inclined in opposite directions and are cross-arranged.

[0132] It can be seen that the first reinforcing ribs 464a and the second reinforcing ribs 464b are arranged crosswise in opposite inclined directions to form a stable grid structure, which further improves the structural strength of the side beam 40, and the grid structure can more effectively absorb and disperse energy, thereby improving the impact resistance and deformation resistance of the side beam 40, and facilitating the improvement of the stability of the operation of the battery device 1. It can be understood that the plurality of reinforcing ribs 464 may include a plurality of first reinforcing ribs 464a and a plurality of second reinforcing ribs 464b, so as to further improve the structural strength of the side beam 40; Figure 7 In the example, multiple first reinforcing ribs 464a are arranged at intervals along the height direction of the heat exchanger 30, and the multiple first reinforcing ribs 464a are parallel, and multiple second reinforcing ribs 464b are arranged at intervals along the height direction of the heat exchanger 30, and the multiple second reinforcing ribs 464b are parallel.

[0133] Exemplarily, taking the height direction of the heat exchanger 30 as the up and down direction, each of the first reinforcing rib 464a and the second reinforcing rib 464b is respectively connected to the two side walls of the energy absorption cavity 460 in the radial direction of the frame 18, and the first reinforcing rib 464a extends upwardly and obliquely from the energy absorption part 46 toward the mounting part 42, and the second reinforcing rib 464b extends upwardly and obliquely from the energy absorption part 46 toward the flow channel part 44, so that the inclination directions of the first reinforcing rib 464a and the second reinforcing rib 464b are opposite, and the first reinforcing rib 464a and the second reinforcing rib 464b are cross-arranged so that the first reinforcing rib 464a and the second reinforcing rib 464b form an "X" shape in the energy absorption cavity 460, which can effectively absorb and disperse energy, so as to improve the structural strength of the side beam 40.

[0134] Please refer to Figure 7In some embodiments, there are multiple energy absorbing cavities 460 and the multiple energy absorbing cavities 460 are arranged in sequence from the flow channel portion 44 toward the mounting portion 42, and the reinforcing ribs 464 corresponding to two adjacent energy absorbing cavities 460 are connected to the same position of the partition cavity wall 461 between the two adjacent energy absorbing cavities 460.

[0135] It can be seen that the multiple energy absorption cavities 460 are arranged in sequence along the direction of the flow channel portion 44 toward the mounting portion 42. When the battery device 1 is subjected to external impact or vibration, the impact energy can be gradually absorbed and dispersed by the multiple energy absorption cavities 460, and it is not easy to affect the normal operation of the flow channel portion 44.

[0136] In addition, the partition cavity wall 461 can serve as a common cavity wall for two adjacent energy absorption cavities 460, and the two adjacent energy absorption cavities 460 are respectively located on both sides of the thickness of the partition cavity wall 461, and the corresponding reinforcing ribs 464 of the two adjacent energy absorption cavities 460 are connected to the same position of the partition cavity wall 461 between the two adjacent energy absorption cavities 460, which is beneficial to shorten the force transmission path between the above-mentioned corresponding reinforcing ribs 464 of the two adjacent energy absorption cavities 460, and is beneficial to improve the force of the partition cavity wall 461, so that the structural strength of the adjacent energy absorption cavities 460 is better, which is more conducive to dispersing the impact energy, and improving the impact resistance and deformation resistance of the energy absorption cavity 460, so that the battery device 1 is more stable during operation.

[0137] For example, in combination Figure 7 The multiple energy absorbing cavities 460 include adjacent first energy absorbing cavities 460a and second energy absorbing cavities 460b, a partition cavity wall 461 is provided between the first energy absorbing cavity 460a and the second energy absorbing cavity 460b, a plurality of reinforcing ribs 464 are provided in each energy absorbing cavity 460, and the plurality of reinforcing ribs 464 located in adjacent energy absorbing cavities 460 are arranged one by one, the two ends of the reinforcing rib 464 located in the first energy absorbing cavity 460a are respectively connected to the cavity wall of the first energy absorbing cavity 460a on one side facing the flow channel portion 44 and the partition cavity wall 461, and the two ends of the reinforcing rib 464 located in the second energy absorbing cavity 460b are respectively connected to the side of the second energy absorbing cavity 460b facing the mounting portion 42 The cavity wall and the partition cavity wall 461, the first reinforcing rib 464a located in the first energy absorption cavity 460a and the second reinforcing rib 464b located in the second energy absorption cavity 460b are correspondingly connected to the same position of the partition cavity wall 461 in the height direction of the heat exchanger 30, the second reinforcing rib 464b located in the first energy absorption cavity 460a and the first reinforcing rib 464a located in the second energy absorption cavity 464b are correspondingly connected to the same position of the partition cavity wall 461 in the height direction of the heat exchanger 30, which is beneficial to appropriately increase the number of reinforcing ribs 464 arranged in each energy absorption cavity 460, and is beneficial to optimize the force transmission paths of the reinforcing ribs 464 in different energy absorption cavities 460.

[0138] In a second aspect, an embodiment of the present application provides an electrical device 2, comprising the battery device 1 of the first aspect.

[0139] In the above technical solution, since the battery device 1 has a good energy density, the battery device 1 can be used to improve the endurance performance of the electrical device 2 .

[0140] Please refer again Figure 2-Figure 7 , describing a battery device 1 according to a specific embodiment of the present application, the battery device 1 includes: a box body 10, a battery cell 20 and a heat exchanger 30.

[0141] The box body 10 includes a top plate 17, a bottom plate 16 and a frame 18. The frame 18 is connected between the top plate 17 and the bottom plate 16. The frame 18 is arranged around the bottom plate 16 and defines a accommodating cavity 12 together with the bottom plate 16 and the top plate 17. The flow channel cavity 14 is arranged in the frame 18, and the connecting port 140 is formed on the inner peripheral wall 180 of the frame 18.

[0142] The battery cell 20 and the heat exchanger 30 are both accommodated in the accommodating chamber 12. The battery cell 20 includes a first wall 22, which is the wall with the largest area in the battery cell 20. The heat exchanger 30 and the first wall 22 are heat-conductively matched, and the heat exchanger 30 and the first wall 22 are fixedly connected. The heat exchanger 30 has a heat exchange flow channel 32 inside. The heat exchanger 30 and the box body 10 are welded and fixed at the connecting port 140, and the two are sealed at the connecting port 140 to separate the accommodating chamber 12 and the flow channel chamber 14, and the heat exchange flow channel 32 is connected with the flow channel chamber 14 through the connecting port 140.

[0143] The heat exchange element 30 is a plate-like structure, and multiple heat exchange elements 30 are arranged at intervals along the thickness direction of the heat exchange element 30. The heat exchange element 30 has corresponding connecting ports 140 at both ends in the length direction, and the heat exchange element 30 is fixedly connected to the box body 10 at both ends in the length direction. At least one of the two side walls of the heat exchange element 30 in the thickness direction is thermally coordinated with at least one battery cell 20, and the bottom 34 of the heat exchange element 30 is bonded and fixed to the bottom plate 16 of the box body 10.

[0144] The frame 18 includes four side beams 40 connected end to end in sequence, wherein two side beams 40 (hereinafter referred to as the first side beam and the second side beam) are arranged opposite to each other along the length direction of the heat exchanger 30, and the remaining two side beams 40 are arranged opposite to each other along the thickness direction of the heat exchanger 30. Each of the first side beam and the second side beam includes a mounting portion 42 and a flow channel portion 44. The mounting portion 42 is arranged on the side of the flow channel portion 44 away from the accommodating chamber 12. The flow channel portion 44 has a cavity 440, and the cavity 440 has a pipeline 4402. The pipeline 4402 participates in defining the cavity wall of the flow channel cavity 14. The flow channel cavity 14 also has a medium inlet 142 and a medium outlet 144. The medium inlet 142 and the medium outlet 144 are both located on the cavity wall of the flow channel cavity 14 facing away from the accommodating chamber 12. A support rib 4404 is also provided in the cavity 440, and the two ends of the support rib 4404 are respectively connected to the cavity walls of the cavity 440 on the radial direction of the frame 18 to divide the cavity 440 into a plurality of spaced-apart chambers 4406. A pipeline 4402 is respectively provided in each chamber 4406, and the plurality of pipelines 4402 jointly define the flow channel cavity 14.

[0145] The side beam 40 also includes an energy absorbing portion 46, which is connected between the mounting portion 42 and the flow channel portion 44. The energy absorbing portion 46 has a plurality of energy absorbing cavities 460, and the plurality of energy absorbing cavities 460 are sequentially arranged from the flow channel portion 44 toward the mounting portion 42. The energy absorbing member 462 is arranged in the energy absorbing cavity 460. The energy absorbing portion 46 and the energy absorbing member 462 are both aluminum parts. The energy absorbing member 462 includes a plurality of reinforcing ribs 464, which are arranged at intervals along the height direction of the heat exchanger 30. The two ends of each reinforcing rib 464 are respectively connected to the energy absorbing cavity 460 at the diameter of the frame 18. The cavity walls on opposite sides are directed upward, and the reinforcing ribs 464 are inclined relative to the direction of the self-flow channel portion 44 toward the mounting portion 42, and the multiple reinforcing ribs 464 include multiple first reinforcing ribs 464a and multiple second reinforcing ribs 464b, each first reinforcing rib 464a corresponds to a second reinforcing rib 464b, and the first reinforcing rib 464a and the corresponding second reinforcing rib 464b are inclined in opposite directions and are cross-arranged, and the reinforcing ribs 464 corresponding to the two adjacent energy absorption cavities 460 are connected to the same position of the partition cavity wall 461 between the two adjacent energy absorption cavities 460.

[0146] A plurality of heat exchange elements 30 are arranged in parallel between a medium inlet 142 and a medium outlet 144. The medium inlet 142 is located on the same side of the plurality of heat exchange elements 30 in the thickness direction and at one end of the first side beam in the thickness direction of the heat exchange element 30. The medium outlet 144 is also located on the same side of the plurality of heat exchange elements 30 in the thickness direction and at one end of the second side beam in the thickness direction of the heat exchange element 30. The flow channel cavity 14 includes a plurality of liquid inlet channels 146. Each liquid inlet channel 146 can be defined by a pipeline 4402. The plurality of liquid inlet channels 146 are respectively connected to the medium inlet 142. Each liquid inlet channel 146 corresponds to a heat exchange channel 32 connected to three heat exchange elements 30. Parts of the plurality of liquid inlet channels 146 are spaced apart along the height direction of the heat exchange element 30. The plurality of connecting ports 140 corresponding to the plurality of liquid inlet channels 146 are at the same height position.

[0147] The present application arranges the flow channel cavity 14 in the frame 18 to make the structure in the box body 10 more compact, and the flow channel cavity 14 is not likely to affect the arrangement of the battery cells 20 in the accommodating cavity 12, so as to improve the energy density of the battery device 1, and the heat exchange component 30 is welded to the connecting port 140, so that the heat exchange medium in the flow channel cavity 14 is not likely to leak into the accommodating cavity 12 and affect the normal operation of the battery cells 20, and the heat exchange component 30 is fixedly connected to the battery cells 20, so that the battery device 1 has good structural strength, so that when the battery device 1 is impacted or vibrated, the heat exchange component 30 can still maintain thermal coordination with the battery cells 20, thereby improving the working stability of the battery device 1.

[0148] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, if there is no special explanation, all the embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution. If there is no special explanation, all the technical features and optional technical features of the present application can be combined with each other to form a new technical solution. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: A box body, wherein the box body has a receiving cavity and a flow channel cavity, and a communication port is provided on a cavity wall of the flow channel cavity facing the receiving cavity; A battery cell, the battery cell being received in the receiving cavity; A heat exchange component is housed in the accommodating cavity and is thermally coordinated with the battery cell. A heat exchange channel is provided in the heat exchange component. The heat exchange component is fixedly connected to the housing and sealed at the connecting port to separate the accommodating cavity and the channel cavity, and the heat exchange channel is connected to the channel cavity through the connecting port.

2. The battery device according to claim 1, characterized in that: The heat exchange element and the box body are welded and fixed at the communication port.

3. The battery device according to claim 1, characterized in that: The battery cell comprises a first wall, which is a wall with the largest area in the battery cell, and the heat exchange element is thermally matched with the first wall.

4. The battery device according to claim 3, characterized in that: The heat exchange element is fixedly connected to the first wall.

5. The battery device according to claim 1, characterized in that: The heat exchange member is a plate-like structure, at least one of the two ends of the heat exchange member in the length direction corresponds to the connecting port, and at least one of the two ends of the heat exchange member in the length direction is fixedly connected to the box body, and at least one of the two side walls of the heat exchange member in the thickness direction is thermally coordinated with the battery cell.

6. The battery device according to claim 5, characterized in that: At least one of the two ends of the heat exchange element in the height direction is fixedly connected to the box body.

7. The battery device according to claim 6, characterized in that: The height direction of the heat exchange element is the up-down direction, and the bottom of the heat exchange element is bonded and fixed to the bottom plate of the box body.

8. The battery device according to claim 1, characterized in that: The flow channel cavity further comprises a medium inlet and a medium outlet, each of the medium inlet and the medium outlet and the communication port are respectively located on different side cavity walls of the flow channel cavity. The two communication ports corresponding to the single heat exchange element are located on the same side or different sides of the heat exchange element.

9. The battery device according to claim 8, characterized in that: The medium inlet and the medium outlet are both located on a cavity wall of the flow channel cavity that faces away from the accommodating cavity.

10. The battery device according to claim 8, characterized in that: There are multiple heat exchange components, and the multiple heat exchange components are arranged in parallel between the medium inlet and the medium outlet.

11. The battery device according to claim 10, characterized in that: The plurality of heat exchange elements are arranged at intervals along the thickness direction of the heat exchange element, and the medium inlet is located on the same side of the plurality of heat exchange elements in the thickness direction. The flow channel cavity includes a liquid inlet flow channel, and the heat exchange flow channel of each heat exchange element is connected to the liquid inlet flow channel; or, The flow channel cavity includes a plurality of liquid inlet flow channels, and the plurality of liquid inlet flow channels are respectively connected to the medium inlet, and each of the liquid inlet flow channels is correspondingly connected to the heat exchange flow channel of at least one of the heat exchange elements.

12. The battery device according to claim 11, characterized in that: At least parts of the plurality of liquid inlet channels are arranged at intervals along the height direction of the heat exchange element.

13. The battery device according to claim 12, characterized in that: In the height direction of the heat exchange element, the plurality of communication openings corresponding to the plurality of liquid inlet channels are at the same height position.

14. The battery device according to any one of claims 1 to 13, characterized in that: The box body includes a top plate, a bottom plate and a frame, the frame is connected between the top plate and the bottom plate, the frame is arranged around the bottom plate and defines the accommodating cavity with the bottom plate and the top plate, the flow channel cavity is arranged in the frame, and the communication port is formed on the inner peripheral wall of the frame.

15. The battery device according to claim 14, characterized in that: The frame includes a plurality of side beams connected end to end in sequence, at least one of the side beams includes a mounting portion and a flow channel portion, the mounting portion is arranged on a side of the flow channel portion away from the accommodating cavity, and the flow channel portion has a cavity therein, At least part of the cavity wall of the cavity participates in defining the cavity wall of the flow channel cavity; and / or, The cavity has a pipeline in it, and the pipeline helps to define the cavity wall of the flow channel cavity.

16. The battery device according to claim 15, characterized in that: A cavity wall of the cavity facing away from the accommodating cavity is spaced apart from a cavity wall of the flow channel cavity facing away from the accommodating cavity; and / or, A supporting rib is arranged in the cavity, and two ends of the supporting rib are respectively connected to two opposite cavity walls of the cavity in the radial direction of the frame, so as to divide the cavity into a plurality of chambers arranged at intervals.

17. The battery device according to claim 15, characterized in that: The side beam further includes an energy absorbing portion, which is connected between the mounting portion and the flow channel portion, and has at least one energy absorbing cavity therein.

18. The battery device according to claim 17, characterized in that: The side beam further comprises an energy absorbing member, and the energy absorbing member is arranged in the energy absorbing cavity.

19. The battery device according to claim 18, characterized in that: The energy absorbing member comprises: A plurality of reinforcing ribs are arranged at intervals along the height direction of the heat exchanger, and both ends of each of the reinforcing ribs are respectively connected to the opposite side walls of the energy absorption cavity in the radial direction of the frame, and the reinforcing ribs are inclined relative to the direction from the flow channel part toward the mounting part.

20. The battery device according to claim 19, characterized in that The plurality of reinforcing ribs include at least one first reinforcing rib and at least one second reinforcing rib, each of the first reinforcing ribs corresponds to one of the second reinforcing ribs, and the first reinforcing ribs and the corresponding second reinforcing ribs are inclined in opposite directions and are cross-arranged.

21. The battery device according to claim 19, characterized in that There are multiple energy absorption cavities, which are arranged in sequence from the flow channel portion toward the mounting portion. The reinforcing ribs corresponding to two adjacent energy absorption cavities are connected to the same position of the partition wall between the two adjacent energy absorption cavities.

22. An electrical device, characterized in that: Comprising a battery device according to any one of claims 1-21.

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