Battery device, electric equipment and energy storage device

Abstract

The invention provides a battery device, electric equipment and an energy storage device, and belongs to the field of batteries. The battery device comprises a box body, and a heat exchange assembly and a plurality of battery monomers accommodated in the box body, the heat exchange assembly comprises a plurality of heat exchange units arranged at intervals along a first direction, each heat exchange unit comprises a current collector and two heat exchange pieces, and the two heat exchange pieces are positioned on two sides of the current collector along a second direction; the current collector comprises liquid inlet pipes and liquid outlet pipes which are arranged at intervals in the third direction and communicate with the interior of the heat exchange part, the liquid inlet pipes of the multiple heat exchange units are sequentially connected in the first direction to form a liquid inlet flow channel, and the liquid outlet pipes of the multiple heat exchange units are sequentially connected in the first direction to form a liquid outlet flow channel; the orthographic projection of the liquid inlet flow channel and the orthographic projection of the liquid outlet flow channel at least partially coincide. Therefore, the liquid inlet flow channel and the liquid outlet flow channel are arranged by fully utilizing the space of the box body along the height direction of the box body, the space utilization rate in the box body is improved, and the volume energy density is favorably improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery device, an electrical equipment and an energy storage device. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of society. Rechargeable batteries have the characteristics of storing energy or releasing energy according to needs, and thus are widely used in various electrical equipment or energy storage systems, and are an important part of promoting energy transformation and sustainable development. For the new energy industry, battery technology is also an important factor related to its development.

[0003] The volumetric energy density of the battery device is closely related to the cruising range of the vehicle. Therefore, in order to meet the requirements of users for the cruising range of the vehicle, how to improve the volumetric energy density of the battery device is a problem worthy of attention. Summary of the Invention

[0004] The present application aims to solve at least one of the technical problems existing in the background art. To this end, an object of the present application is to provide a battery device, an electrical equipment and an energy storage device, so as to be able to improve the volumetric energy density.

[0005] An embodiment of the first aspect of the present application provides a battery device, including: a box body, and a heat exchange component and a plurality of battery cells accommodated in the box body. The heat exchange component includes a plurality of heat exchange units arranged at intervals in a first direction. The heat exchange unit includes a current collector and two heat exchange members. The two heat exchange members are respectively a first heat exchange member and a second heat exchange member. The first heat exchange member and the second heat exchange member are respectively connected to both sides of the current collector in a second direction. The current collector includes a liquid inlet pipe and a liquid outlet pipe arranged at intervals in a third direction. The liquid inlet pipes of the plurality of heat exchange units are connected in sequence in the first direction to form a liquid inlet flow channel, and the liquid outlet pipes of the plurality of heat exchange units are connected in sequence in the first direction to form a liquid outlet flow channel. And the orthographic projection of the liquid inlet flow channel on the bottom plate surface of the box body and the orthographic projection of the liquid outlet flow channel on the bottom plate surface at least partially overlap. A heat exchange flow channel is formed inside the heat exchange member. The inflow end of the heat exchange flow channel is communicated with the liquid inlet flow channel, and the outflow end of the heat exchange flow channel is communicated with the liquid outlet flow channel; the first direction, the second direction and the third direction are perpendicular to each other pairwise; each heat exchange member exchanges heat with at least one battery cell.

[0006] In the technical solution of the embodiment of the present application, the space of the box body along its own height direction is fully utilized to arrange the liquid inlet flow channel and the liquid outlet flow channel, reducing the occupation of the space of the box body along the second direction by the liquid inlet flow channel and the liquid outlet flow channel. In this way, the space utilization rate inside the box body can be improved, and further it is beneficial to improve the volumetric energy density.

[0007] In some embodiments, the central axis of the liquid inlet flow channel and the central axis of the liquid outlet flow channel are located in the same plane, and the plane is perpendicular to the second direction.

[0008] In this embodiment, the space occupied by the liquid inlet channel and the liquid outlet channel in the second direction of the box is further reduced, which is conducive to further improving the space utilization rate in the box and the volume energy density of the battery device.

[0009] In some embodiments, the battery cell includes two first surfaces arranged opposite to each other along a first direction and two second surfaces arranged opposite to each other along a second direction, the area of the first surface is greater than the area of the second surface, and the two surfaces of each heat exchange element arranged opposite to each other along the first direction are parallel to the first surface.

[0010] In some embodiments, along the second direction, the current collectors of the plurality of heat exchange units are all located in the middle of the heat exchange assembly.

[0011] In some embodiments, the battery device also includes a busbar assembly arranged in the box body; reinforcing ribs are provided on the bottom plate; the busbar assembly, the current collector and the reinforcing ribs are arranged in sequence and overlapped along a third direction; the current collector includes a main body, a liquid inlet pipe and a liquid outlet pipe are arranged on the main body, the heat exchange element is connected to the main body, and the main body has a first side surface and a second side surface opposite to each other along a second direction.

[0012] In some embodiments, the reinforcing ribs extend from the inlet end of the liquid inlet channel to the outlet end of the liquid inlet channel along the first direction, and the reinforcing ribs are arranged on the side of the heat exchange unit facing the bottom plate; the reinforcing ribs are located between the first side surface and the second side surface. In this embodiment, by introducing the reinforcing ribs, the structural rigidity and anti-deformation ability of the box can be improved.

[0013] In some embodiments, a first avoidance notch is provided at one end of each body facing the bottom plate, and a portion of the reinforcing rib is passed through the first avoidance notch. This embodiment can reduce the space occupied by the reinforcing rib in the third direction of the box body or make the reinforcing rib not occupy additional space in the third direction of the box body, thereby improving the utilization rate of the space in the box body.

[0014] In some embodiments, the confluence assembly is arranged on the side of the heat exchange unit facing away from the bottom plate, and the confluence assembly extends from one side of the heat exchange assembly to the other side of the heat exchange assembly along a first direction; the confluence assembly is located between the first side surface and the second side surface. In this embodiment, the current can be derived by arranging the confluence assembly.

[0015] In some embodiments, a second avoidance notch is provided at one end of each body facing away from the bottom plate, and part of the confluence assembly is inserted into the second avoidance notch. While introducing the confluence assembly, this embodiment can also compress the total size of the confluence assembly and the heat exchange assembly in the third direction, so that the height of the box can be smaller.

[0016] In some embodiments, the heat exchange unit, the reinforcing ribs, and the busbar assembly are symmetrically arranged with respect to the central plane, which is a plane passing through the center of the box body and perpendicular to the second direction. In this embodiment, the heat exchange unit, the busbar assembly, and the reinforcing ribs are all located in the middle of the box body along the second direction, which is conducive to making the temperature adjustment effects of the first heat exchange element and the second heat exchange element equivalent, and is also conducive to further improving the structural rigidity and anti-deformation ability of the box body.

[0017] In some embodiments, two partition plates are provided inside the box body, and the two partition plates divide the internal space of the box body into a first accommodation chamber, a second accommodation chamber, and a third accommodation chamber arranged in sequence along the first direction. A plurality of battery cells and a heat exchange assembly are arranged in the second accommodation chamber, and one end of the reinforcing rib along the first direction is fixedly connected to the partition plate located between the second accommodation chamber and the third accommodation chamber. This embodiment enables the structural stability of the partition plate to be improved, so that the partition plate can reliably limit the expansion of a plurality of battery cells.

[0018] In some embodiments, the battery device further includes an input pipe and an output pipe arranged in the first accommodation chamber and extending along the first direction. One end of the input pipe is communicated with the liquid inlet flow channel, one end of the output pipe is communicated with the liquid outlet flow channel, and the other end of the input pipe is used to be communicated with a liquid supply flow path located outside the box body.

[0019] In this embodiment, the heat exchange medium in the input pipe and the output pipe flows linearly and has a short flow path, so the pressure drop is small and the flow resistance is small.

[0020] In some embodiments, the battery device further includes two limiting members located on the side of the busbar assembly facing away from the bottom plate, and the two limiting members correspond to the two partition plates one by one; both ends of each limiting member in the second direction straddle both sides of the busbar assembly, and both ends of each limiting member are fixedly connected to the corresponding partition plate to limit the movement of the busbar assembly toward the side facing away from the bottom plate. This embodiment improves the installation reliability of the busbar assembly to reduce the short-circuit risk caused by the displacement of the busbar assembly contacting other electrical components.

[0021] An embodiment of the second aspect of the present application provides an electrical equipment, which includes the battery device in the above embodiment, and the battery device is used to provide electric energy.

[0022] An embodiment of the third aspect of the present application provides an energy storage device, which includes the battery device in the above embodiment, and the battery device can store electric energy.

[0023] The above description is only an overview of the technical solutions of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features, and advantages of the present application more obvious and understandable, the following specifically describes the specific embodiments of the present application. Description of the Drawings

[0024] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the several views denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0025] Figure 1 Schematic structural diagram of a vehicle according to some embodiments of the present application; Figure 2 Schematic structural diagram of a battery device according to some embodiments of the present application; Figure 3 is Figure 2 Exploded structural diagram of the battery device shown; Figure 4 is Figure 2 Schematic structural diagram of the heat exchange component of the battery device shown; Figure 5 is Figure 4 Schematic structural diagram of the heat exchange unit in the heat exchange component shown; Figure 6 is Figure 4 Cross-sectional view of the heat exchange unit shown; Figure 7 is Figure 6 Partial enlarged view at A in ; Figure 8 is Figure 2 Partial schematic diagram of the battery device shown; Figure 9 is Figure 8 Partial schematic diagram of the bus bar assembly, heat exchange component and box body in the main viewing direction in the one shown; Figure 10 is Figure 2 Schematic diagram of a partial structure of the battery device shown; Figure 11 is Figure 10 Partial schematic diagram of the bus bar assembly and the box body in the battery device shown.

[0026] Explanation of reference numerals: Vehicle 1000; Battery device 100, controller 200, motor 300; Heat exchange component 10, heat exchange unit 11, current collector 111, body 1111, liquid inlet pipe 1112, liquid outlet pipe 1113, first channel 1114, second channel 1115, first avoidance notch 1116, second avoidance notch 1117, heat exchange member 112, first heat exchange member 112a, second heat exchange member 112b, heat exchange flow channel 1121, liquid inlet flow channel 12, liquid outlet flow channel 13, end cover 14; Box body 20, bottom plate 21, reinforcing rib 211, first wall 22, second wall 23, third wall 24, fourth wall 25, partition 26, first sub-partition 261, second sub-partition 262, first accommodation bin 27, second accommodation bin 28, third accommodation bin 29; Battery cell 30, first surface 31, second surface 32, busbar assembly 40, first busbar 41, second busbar 42, limiting member 50, input pipe 60, output pipe 70; First direction X, second direction Y, third direction Z. Detailed implementation mode

[0027] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description of the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0029] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality" means more than two unless otherwise specifically defined.

[0030] Referring to "embodiment" herein means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase does not necessarily refer to the same embodiment in every location in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0031] In the description of the embodiments of the present application, the term " / and" is only a description of the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally means that the associated objects before and after are in an "or" relationship.

[0032] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple sheets" refers to two or more sheets (including two sheets).

[0033] In the description of the embodiments of the present application, for technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0034] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements.

[0035] In the present application, the term "parallel" includes not only the case of absolute parallelism, but also the case of approximately parallelism commonly recognized in engineering; at the same time, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximately perpendicularity commonly recognized in engineering. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0036] In some existing battery devices, multiple cuboid battery monomers are stacked in the box along their own thickness direction to form a battery monomer assembly. The large surfaces of each battery monomer are arranged opposite to each other along the stacking direction of the battery monomers. The large surface refers to the surface with the largest area on the battery monomer. In order to enable the battery monomers to operate within a suitable temperature range, a heat exchange plate is provided between adjacent two battery monomers. The heat exchange plate is in contact with the large surface of the battery monomer, and the heat exchange plate has a channel for the heat exchange medium to flow through to adjust the temperature of the battery monomer.

[0037] In order to enable the heat exchange medium to flow into the heat exchange plate to exchange heat with the battery monomer and flow out after heat exchange, an inlet flow channel and an outlet flow channel are respectively formed on both sides of the heat exchange plate along the length direction of the battery monomer. The channel inside the heat exchange plate connects the inlet flow channel and the outlet flow channel. The inlet flow channel is used to input the heat exchange medium, and the outlet flow channel is used to export the heat exchange medium. Among them, the components constructing the inlet flow channel and the outlet flow channel are all located between the battery monomer assembly and the side wall of the box.

[0038] It can be seen that in such a battery device, the liquid inlet flow channel and the liquid outlet flow channel are arranged at intervals along the length direction of the battery cell, each occupying the space inside the box along the length direction of the battery cell. Therefore, the volume energy density of this battery device is relatively low.

[0039] Based on the above considerations, in order to improve the volume energy density, the present application designs a battery device. By arranging the liquid inlet flow channel and the liquid outlet flow channel vertically along the height direction of the box, and within the surface of the bottom plate of the box, at least part of the orthographic projection of the liquid inlet flow channel coincides with the orthographic projection of the liquid outlet flow channel. In other words, the liquid inlet flow channel and the liquid outlet flow channel are arranged overlappingly along the height direction of the box. In such a battery device, since the liquid inlet flow channel and the liquid outlet flow channel do not separately occupy the space inside the box along the length direction of the battery cell, the space utilization rate inside the box is improved, which in turn has a positive effect on improving the volume energy density of the battery device.

[0040] The battery device involved in the embodiments of the present application can be but is not limited to being used in power-consuming devices or energy storage devices such as vehicles, ships, or aircraft.

[0041] In the embodiments of the present application, using the battery device as an energy storage device of the power supply system can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during low electricity consumption periods, and during high electricity consumption periods, provide electrical energy to relevant users or power-consuming devices. The energy storage device provided by the embodiments of the present application can be any power system that requires an energy storage device.

[0042] In some embodiments, the energy storage device is an energy storage container, an energy storage electrical cabinet, an energy storage power station, an energy storage battery pack, or a portable energy storage system.

[0043] In some embodiments, the energy storage device may include a cabinet body and one or more battery clusters (BatteryCluster), and the battery clusters are accommodated in the cabinet body. The battery cluster can include a plurality of battery devices, and the plurality of battery devices are connected in series through a busbar component to increase the voltage of the energy storage device. When the energy storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0044] The power-consuming devices using the battery device as a power source in the embodiments of the present application can be but are not limited to mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc. For the sake of brief description, the following embodiments will be described by taking an electric vehicle as an example.

[0045] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery device 100 is disposed inside the vehicle 1000, and the battery device 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0046] In some embodiments of the present application, the battery device 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0047] Figure 2 A schematic structural diagram of the battery device 100 according to an embodiment of the present application is shown, Figure 3 which is Figure 2 a disassembled structural diagram of the battery device 100 shown, Figure 4 which is Figure 2 a schematic structural diagram of the heat exchange assembly 10 of the battery device 100 shown, Figure 5 which is Figure 4 a schematic structural diagram of the heat exchange unit in the heat exchange assembly shown, Figure 6 which is Figure 4 a sectional view of the heat exchange unit shown, Figure 7 which is Figure 6 a partial enlarged schematic view of the position A in Figure 2 and Figure 3 As shown in Figure 3 and Figure 4 , 32 heat exchange units 11 are shown. As Figure 5As shown, the heat exchange unit 11 includes a current collector 111 and two heat exchange members (either a single "heat exchange member 112" or multiple "heat exchange members 112" are collectively referred to as "heat exchange members 112"). The two heat exchange members 112 are respectively a first heat exchange member 112a and a second heat exchange member 112b. The first heat exchange member 112a and the second heat exchange member 112b are arranged at intervals along the second direction Y, and are respectively connected to both sides of the current collector 111 along the second direction Y. The current collector 111 includes a liquid inlet pipe 1112 and a liquid outlet pipe 1113 arranged at intervals along the third direction Z. The liquid inlet pipes 1112 of multiple heat exchange units 11 are connected in sequence along the first direction X to form a liquid inlet flow channel 12, and the liquid outlet pipes 1113 of multiple heat exchange units 11 are connected in sequence along the first direction X to form a liquid outlet flow channel 13, and the orthographic projection of the liquid inlet flow channel 12 on the surface of the bottom plate 21 of the box body 20 coincides at least partially with the orthographic projection of the liquid outlet flow channel 13 on the surface of the bottom plate 21. As Figure 6 and Figure 7 shown, a heat exchange flow channel 1121 is formed inside the heat exchange member 112. The inflow end of the heat exchange flow channel 1121 is communicated with the liquid inlet flow channel 12, and the outflow end of the heat exchange flow channel 1121 is communicated with the liquid outlet flow channel 13. The first direction X, the second direction Y and the third direction Z are perpendicular to each other in pairs. The battery device 100 further includes a plurality of battery cells 30, and each heat exchange member 112 exchanges heat with at least one battery cell 30.

[0048] The box body 20 can be a simple three-dimensional structure such as a single cuboid, cylinder or sphere, or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as a cuboid, cylinder or sphere, etc. The material of the box body 20 can be alloy materials such as aluminum alloy and ferroalloy, or polymer materials such as polycarbonate and polyisocyanurate foam, or composite materials such as glass fiber reinforced epoxy resin, etc.

[0049] As an example, the box body 20 may include a first box body and a second box body. The first box body and the second box body are buckled so that a closed space is formed inside the box body 20 to accommodate the battery cells 30. The term "closed" here means covered or closed, which can be non-sealed or sealed to prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells 30. The first box body (not shown in the figure) can be a top cover or the bottom plate 21.

[0050] As an example, the box body 20 may include a top cover, a frame and a bottom plate 21. The top cover and the bottom plate 21 are respectively connected to the frame so that a closed space is formed inside the box body 20 to accommodate the battery cells 30.

[0051] In some embodiments, the box body 20 can be a part of the chassis structure of the vehicle 1000. For example, a part of the box body 20 can become at least a part of the floor of the vehicle 1000, or a part of the box body 20 can become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0052] The battery cell 30 is used to provide voltage and capacity. Multiple battery cells 30 can be connected in series, parallel, or in a hybrid connection through a busbar component. As an example, the battery cell 30 can be accommodated in the box body 20 by being directly fixed to the box body 20. The battery cell 30 can be a secondary battery, which means that after the battery cell 30 discharges, the active material can be activated by charging and the battery cell 30 can be used continuously. The battery cell 30 can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto. As an example, the battery cell 30 is not limited to being Figure 2 the square shell battery cell shown, and can also be a cylindrical battery cell, a blade-shaped battery cell, or a battery cell 30 of other shapes, and there is no special limitation in the present application.

[0053] The heat exchange component 10 refers to a component with heat transfer and exchange functions. Both the liquid inlet pipe 1112 and the liquid outlet pipe 1113 are used for the flow of the heat exchange medium. Among them, the extending direction of the liquid inlet pipe 1112 and the extending direction of the liquid outlet pipe 1113 can be parallel to the first direction X or can form an angle with the first direction X. All the liquid inlet pipes 1112 can be coaxially arranged to form a liquid inlet flow channel 12, and all the liquid outlet pipes 1113 can be coaxially arranged to form a liquid outlet flow channel 13.

[0054] Among them, taking the battery cell 30 as a cuboid as an example, the first direction X is parallel to the thickness direction of the battery cell 30, the second direction Y is parallel to the length direction of the battery cell 30, and the third direction Z is parallel to the height direction of the battery cell 30. In Figure 7 it, the liquid inlet pipe 1112 and the liquid outlet pipe 1113 arranged at intervals along the third direction Z are distributed up and down. As an example, as Figure 5 and Figure 7 shown, the liquid inlet pipe 1112 can be located above the liquid outlet pipe 1113, and correspondingly, the liquid inlet flow channel 12 is located above the liquid outlet flow channel 13. As an example, the liquid inlet pipe 1112 can be located below the liquid outlet pipe 1113, and correspondingly, the liquid inlet flow channel 12 is located below the liquid outlet flow channel 13.

[0055] The heat exchange element 112 is a hollow structure. The heat exchange flow channel 1121 is configured such that the heat exchange medium needs to make one turn-back or N turn-backs from the inflow end to the outflow end, where N is an odd number greater than or equal to 3, so that the inflow end and the outflow end can be located at the same end of the heat exchange element 112 along the second direction Y. As Figure 6As shown, the heat exchanger 112 is provided with two flow channels arranged in sequence along the third direction Z. The flow channels extend along the second direction Y, and the two flow channels are connected in series in sequence to form a heat exchange flow channel 1121. The flow directions of the heat exchange media in the two flow channels are opposite. Of course, in other embodiments, the number of flow channels in the heat exchanger 112 can also be N + 1, and the flow directions of the heat exchange media in any two adjacent flow channels are opposite.

[0056] Each heat exchanger 112 can perform heat exchange with one battery cell 30, or can also perform heat equalization exchange with multiple battery cells 30 arranged in sequence along the second direction Y, such as Figure 2 and Figure 3 , which shows three battery cells 30. Of course, in other embodiments, each heat exchanger 112 can also perform heat exchange with two, four, five or more battery cells 30.

[0057] The heat exchange method between the heat exchanger 112 and the battery cell 30 can be contact heat exchange. For example, at least one surface of each heat exchanger 112 is in contact with the battery cell 30. Or, alternatively, a heat conducting member (such as heat conducting glue) is provided between at least one surface of each heat exchanger 112 and the battery cell 30, and the heat conducting member is used to transfer heat. As an example, battery cells 30 are provided on both sides of each heat exchanger 112 along the first direction X. As an example, when the number of heat exchange units 11 is greater than or equal to 3, battery cells 30 are provided on both sides of the heat exchanger 112 of the middle one of any adjacent three heat exchange units 11 along the first direction X. The box body 20 has a first wall 22 and a second wall 23 arranged opposite to each other along the first direction X, and the box body 20 has a third wall 24 and a fourth wall 25 arranged opposite to each other along the second direction Y. For the heat exchanger 112 of the heat exchange unit 11 closest to the first wall 22 among all the heat exchange units 11, battery cells 30 are provided on the side facing other heat exchange units 11, and no battery cells 30 are provided on the side facing away from other heat exchange units 11. For the heat exchange unit 11 closest to the second wall 23 among all the heat exchange units 11, battery cells 30 are provided on the side facing other heat exchange units 11, and no battery cells 30 are provided on the side facing away from other heat exchange units 11.

[0058] The first heat exchanger 112a and the second heat exchanger 112b extend along the second direction Y. The extension lengths of the first heat exchanger 112a and the second heat exchanger 112b can be the same, and both perform heat exchange with the same number of battery cells 30, such as Figure 2 and Figure 3 shown, both the first heat exchanger 112a and the second heat exchanger 112b perform heat exchange with three battery cells 30. Of course, in other embodiments of the present application, the extension lengths of the first heat exchanger 112a and the second heat exchanger 112b can also be different, and both can also perform heat exchange with different numbers of battery cells 30.

[0059] It can be understood that the maximum dimension of the space occupied by the liquid inlet channel 12 and the liquid outlet channel 13 in the box body 20 in the second direction Y is the first dimension, the maximum dimension of the liquid inlet channel in the second direction Y is the second dimension, and the maximum dimension of the liquid outlet channel in the second direction Y is the third dimension. The first dimension is less than the sum of the second dimension and the third dimension.

[0060] In this embodiment, the liquid inlet channel 12 for inputting the heat exchange medium to the heat exchange member 112 and the liquid outlet channel 13 for outputting the heat exchange medium are arranged up and down along the height direction (i.e., the third direction Z) of the battery cell 30. And within the surface of the bottom plate 21, the orthographic projection of the liquid inlet channel 12 and the orthographic projection of the liquid outlet channel 13 at least partially overlap, so that at least part of the liquid inlet channel 12 and at least part of the liquid outlet channel 13 occupy the same space in the box body 20 in the second direction Y.

[0061] Thus, the battery device 100 of this embodiment makes full use of the space along its own height direction of the box body 20 to arrange the liquid inlet channel 12 and the liquid outlet channel 13, reducing the occupation of the space of the box body 20 in the second direction Y by the liquid inlet channel 12 and the liquid outlet channel 13. In this way, the space utilization rate inside the box body 20 can be improved, which is conducive to enhancing the volumetric energy density.

[0062] It can be understood that in the technical solution where the number of heat exchange members 112 is one, each current collector 111 can be arranged adjacent to the third wall 24 or the fourth wall 25. Each heat exchange member 112 is used to adjust the temperature of an entire row of battery cells 30. A row of battery cells 30 includes a plurality of battery cells 30 arranged in sequence in the second direction Y. And in this embodiment, the current collector 111 is located between the first heat exchange member 112a and the second heat exchange member 112b. The first heat exchange member 112a is used to adjust the temperature of a partial number of battery cells 30 in an entire row of battery cells 30, and the second heat exchange member 112b is used to adjust the temperature of the remaining number of battery cells 30 in an entire row of battery cells 30. In this way, in this embodiment, the number of battery cells 30 corresponding to the first heat exchange member 112a and the second heat exchange member 112b is small, and the temperature difference of the plurality of battery cells 30 arranged in a row is small and the temperature uniformity is higher. Furthermore, the negative impact of the poor temperature distribution uniformity of the battery cells 30 on their internal resistance can be small, which is conducive to improving the performance of the battery cells 30.

[0063] Among them, the positional relationship between the central axis of the liquid inlet channel 12 and the central axis of the liquid outlet channel 13 is diverse. In some embodiments, along the second direction Y, the central axis of the liquid inlet channel 12 is offset from the central axis of the liquid outlet channel 13 by a first distance, and the first distance is greater than 0 millimeters (mm). That is, along the second direction Y, the central axis of the liquid inlet channel 12 can be closer to the heat exchange member 112 than the central axis of the liquid outlet channel 13.

[0064] According to some embodiments of the present application, the central axes of the liquid inlet flow channel 12 and the liquid outlet flow channel 13 may specifically be located in the same plane, and this plane is perpendicular to the second direction Y. For the central axes of the liquid inlet flow channel 12 and the liquid outlet flow channel 13 to be in the same plane means that the centers of the liquid inlet flow channel 12 and the liquid outlet flow channel 13 are not offset in the second direction Y. In this example, the first dimension is equal to the larger of the second dimension and the third dimension.

[0065] Compared with the technical solution in which there is a gap between the central axis of the liquid inlet flow channel 12 and the central axis of the liquid outlet flow channel 13 in the second direction Y, without changing the dimension of the liquid inlet flow channel 12 along the second direction Y (i.e., the second dimension) and the dimension of the liquid outlet flow channel 13 along the second direction Y (i.e., the third dimension), in this embodiment, the occupation of the space of the box body 20 along the second direction Y by the liquid inlet flow channel 12 and the liquid outlet flow channel 13 is further reduced, which is beneficial to further improving the space utilization rate inside the box body 20 and the volume energy density of the battery device 100.

[0066] In some embodiments, taking the cross-section perpendicular to the first direction X as the axial cross-section, the axial cross-sectional shapes and axial cross-sectional dimensions of the liquid inlet pipe 1112 and the liquid outlet pipe 1113 may be the same. As Figure 7 shown, the axial cross-sections of the liquid inlet pipe 1112 and the liquid outlet pipe 1113 are both circular, and the aperture diameter of the liquid inlet pipe 1112 (i.e., the second dimension) is equal to the aperture diameter of the liquid outlet pipe 1113 (i.e., the third dimension). In this example, within the surface of the bottom plate 21, the orthographic projection of the liquid inlet pipe 1112 completely coincides with the orthographic projection of the liquid outlet pipe 1113, and the first dimension, the second dimension, and the third dimension are equal. On the premise of reducing the occupation of the space of the box body 20 along the second direction Y by the liquid inlet flow channel 12 and the liquid outlet flow channel 13, this embodiment can also make the second dimension and the third dimension equal. Compared with the solution where the second dimension and the third dimension are not equal, in this embodiment, both the second dimension and the third dimension are relatively large, so that the flow rate of the heat exchange medium accommodated in the liquid inlet flow channel 12 and the liquid outlet flow channel 13 can be larger, which can promote the improvement of the heat exchange capacity of the heat exchange assembly 10. Of course, in other embodiments of the present application, the axial cross-sectional shape of the liquid inlet pipe 1112 and the liquid outlet pipe 1113 may be any one of a rectangle, an ellipse, a long strip, a kidney shape, etc.

[0067] The specific way to realize the connection between the inlet end of the heat exchange flow channel 1121 and the liquid inlet flow channel 12 may be: as Figure 7As shown, the current collector 111 is provided with a first channel 1114. One end of the first channel 1114 is connected to the inflow end, and the other end penetrates through the pipe wall of the liquid inlet pipe 1112. Then, the heat exchange medium flows from the liquid inlet pipe 1112 into the first channel 1114 and then enters the heat exchange flow channel 1121 through the inflow end. The extending direction of the first channel 1114 may be parallel to the second direction Y or may form an angle with the second direction Y. The number of the first channels 1114 is not limited to one, and may also be two, three or more.

[0068] The specific way to realize the connection between the outflow end of the heat exchange flow channel 1121 and the liquid outlet flow channel 13 can be: Please continue to refer to Figure 7 , the current collector 111 is provided with a second channel 1115. One end of the second channel 1115 is connected to the outflow end, and the other end penetrates through the pipe wall of the liquid outlet pipe 1113, so that the outflow end is connected to the liquid outlet flow channel 13. The extending direction and the number of the second channels 1115 can be set with reference to the first channel 1114, and will not be elaborated here.

[0069] In some embodiments, an end cover 14 is provided at one end of the heat exchange member 112 facing away from the current collector 111 to prevent the heat exchange medium from flowing out.

[0070] Figure 8 For Figure 2 a partial schematic view of the battery device 100 shown, Figure 9 For Figure 8 a partial schematic view of the busbar assembly 40, the heat exchange assembly 10 and the box body 20 shown in the front view direction, Figure 10 For Figure 2 a schematic view of a part of the structure of the battery device shown. According to some embodiments of the present application, as Figures 8 to 10 shown, the battery device 100 further includes a busbar assembly 40 disposed in the box body 20. Reinforcing ribs 211 are provided on the bottom plate 21. The busbar assembly 40, the current collector 111 and the reinforcing ribs 211 are sequentially overlapped along the third direction Z.

[0071] The busbar assembly 40 is a conductive metal part connecting a plurality of battery cells 30, and is a component for collecting current and distributing current. The busbar assembly 40 is located on the side of the current collector 111 facing away from the bottom plate 21. The busbar assembly 40 is a conductive metal part connecting a plurality of battery cells 30, and is a component for collecting current and distributing current. The busbar assembly 40 can be used to connect to a high-voltage connector on the box body 20, and is electrically connected to other electrical systems of the vehicle 1000 through the high-voltage connector to realize power supply to the electrical system.

[0072] The reinforcing ribs 211 are components protruding from the surface of the bottom plate 21. The reinforcing ribs 211 are located on the side of the current collector 111 facing the bottom plate 21. The specific structure of the reinforcing ribs 211 in this embodiment is not particularly limited. Exemplarily, as Figure 9As shown, the reinforcing rib 211 may include a base plate and a rectangular tube body, the base plate is arranged on the bottom plate 21, the rectangular tube body is arranged on the surface of the base plate facing away from the bottom plate 21, and both ends of the base plate along the second direction Y are provided with flanges, and the flanges protrude from the base plate along the third direction Z. In other embodiments, the reinforcing rib 211 may also be a tubular structure or a columnar structure, and the cross-sectional shape of the reinforcing rib 211 along the direction perpendicular to the first direction X may be a rectangle, a circle, an ellipse, a triangle, etc. In some embodiments, the reinforcing rib 211 may be an integrated structure, so that the structural strength of the reinforcing rib 211 can be improved without increasing the cost.

[0073] By providing the reinforcing ribs 211, the structural rigidity and anti-deformation ability of the box 20 can be improved. By providing the busbar assembly 40, the current can be extracted. Moreover, compared with the technical solution in which the busbar assembly 40, the current collector 111 and the reinforcing ribs 211 are arranged in sequence along the second direction Y, in this embodiment, the space of the box 20 along its own height direction (i.e., the third direction Z) is fully utilized to arrange the busbar assembly 40, the current collector 111 and the reinforcing ribs 211, and the busbar assembly 40, the current collector 111 and the reinforcing ribs 211 overlap along the third direction Z. The busbar assembly 40, the current collector 111 and the reinforcing ribs 211 with the smaller maximum size along the second direction Y will not occupy the space in the box 20 along the second direction Y, thereby improving the space utilization rate in the box 20 along the third direction Z.

[0074] In addition, the current collector 111 specifically includes a body 1111 , a liquid inlet pipe 1112 and a liquid outlet pipe 1113 are both arranged on the body 1111 , the heat exchange element 112 is connected to the body 1111 , and the body 1111 has a first side surface and a second side surface opposite to each other along the second direction Y.

[0075] For each heat exchange unit 11, the liquid inlet pipe 1112 and the liquid outlet pipe 1113 are fixedly connected to the body 1111, and the fixed connection can be a detachable connection, a non-detachable connection, or an integrated connection. For example, the liquid inlet pipe 1112 and the liquid outlet pipe 1113 and the body 1111 can be processed by an integral molding process such as an injection molding process or a casting process, so that the current collector 111 forms an integrated structure.

[0076] The size of the first side surface and the second side surface along the second direction Y is D, and D is larger than the outer diameter of the liquid inlet tube 1112 and the outer diameter of the liquid outlet tube 1113, that is, the size of the space occupied by the collector 111 in the box body 20 in the second direction Y is larger than the outer diameter of the liquid inlet tube 1112 and the outer diameter of the liquid outlet tube 1113.

[0077] According to some embodiments of the present application, Figure 8 and Figure 9As shown, the reinforcing rib 211 extends along the first direction X from the inlet end of the liquid inlet channel 12 to the outlet end of the liquid inlet channel 12. The reinforcing rib 211 is disposed on the side of the heat exchange unit 11 facing the bottom plate 21. The reinforcing rib 211 is located between the first side surface and the second side surface.

[0078] That the reinforcing rib 211 is located between the first side surface and the second side surface means that, within the surface of the bottom plate 21, both side edges of the orthographic projection of the reinforcing rib 211 along the second direction Y are located between the side edges of the orthographic projection of the main body 1111 along the second direction Y. The first side surface is located between the second side surface and the third wall 24. One end of the reinforcing rib 211 close to the third wall 24 does not extend beyond the space between the first side surface and the third wall 24, and one end of the reinforcing rib 211 close to the fourth wall 25 does not extend beyond the space between the second side surface and the fourth wall 25.

[0079] In this embodiment, by making the reinforcing rib 211 located between the first side surface and the second side surface, the space below the heat exchange unit 11 is utilized to arrange the reinforcing rib 211, so that the reinforcing rib 211 does not additionally occupy the space of the box body 20 in the second direction Y, so as to keep the battery device 100 with a high volumetric energy density. In this embodiment, the introduction of the reinforcing rib 211 does not increase the size of the box body 20 in the second direction Y.

[0080] According to some embodiments of the present application, as Figure 7 、 Figure 8 and Figure 9 shown, one end of each main body 1111 facing the bottom plate 21 may be provided with a first avoidance notch 1116, and a part of the reinforcing rib 211 is inserted into the first avoidance notch 1116.

[0081] The first avoidance notch 1116 penetrates through two opposite surfaces of the main body 1111 along the first direction X. The reinforcing rib 211 extends from the inlet end of the liquid inlet channel 12 to the outlet end of the liquid inlet channel 12, and successively passes through the first avoidance notches 1116 of each main body 1111. Among them, taking the cross-section perpendicular to the first direction X as the axial cross-section, part of the axial cross-section of the reinforcing rib 211 at the first avoidance notch 1116 may be located within the first avoidance notch 1116, or all of the axial cross-section of the reinforcing rib 211 at the first avoidance notch 1116 may be located within the first avoidance notch 1116. Optionally, the shape of the first avoidance notch 1116 may be adapted to the shape of the part of the reinforcing rib 211 received within the first avoidance notch 1116. As an example, a part of the reinforcing rib 211 passes through the first avoidance notch 1116. As Figure 9As shown, the reinforcing rib 211 includes a base plate and a rectangular tube body. A part of the rectangular tube body is disposed in the first avoidance notch 1116, and the cross-section of the first avoidance notch 1116 perpendicular to the first direction X is rectangular. As an example, the reinforcing rib can also be entirely disposed in the first avoidance notch 1116. In this example, the bottom of the body 1111 abuts against the bottom plate 21.

[0082] In this embodiment, a part of the reinforcing rib 211 is disposed in the first avoidance notch 1116, and the space of the box body 20 occupied by the heat exchange unit 11 in the third direction Z is used to accommodate at least a part of the reinforcing rib 211. In this way, the occupation of the space of the box body 20 in the third direction Z by the reinforcing rib 211 can be reduced, or the reinforcing rib 211 will not additionally occupy the space of the box body 20 in the third direction Z, improving the space utilization rate in the third direction Z of the box body 20. While introducing the reinforcing rib 211 in this embodiment, the total dimension of the reinforcing rib 211 and the heat exchange component 10 in the third direction Z can also be compressed, so that the height of the box body 20 can be smaller.

[0083] According to some embodiments of the present application, as Figure 3 and Figure 9 shown, the bus bar assembly 40 is disposed on the side of the heat exchange unit 11 facing away from the bottom plate 21, and the bus bar assembly 40 extends from one side of the heat exchange component 10 to the other side along the first direction X. The bus bar assembly is located between the first side surface and the second side surface.

[0084] The bus bar assembly 40 being located between the first side surface and the second side surface means that in the surface of the bottom plate 21, the two side edges of the orthographic projection of the bus bar assembly 40 along the second direction Y are both located between the two side edges of the orthographic projection of the body 1111 along the second direction Y.

[0085] Please continue to refer to Figure 3 and Figure 9 , the bus bar assembly 40 may specifically include a first bus bar 41 and a second bus bar 42. The first bus bar 41 and the second bus bar 42 are spaced apart along the third direction Z. The first bus bar 41 is connected to the positive terminal of the battery cell 30 and the high-voltage connector, and the second bus bar 42 is connected to the negative terminal of the battery cell 30 and the high-voltage connector. The second bus bar 42 may be located on the side of the first bus bar 41 facing away from the bottom plate 21. Among them, the number of the first bus bar 41 and the second bus bar 42 is not limited to one, and may also be three, four or more.

[0086] In this embodiment, by making the bus bar assembly 40 located between the first side surface and the second side surface, the bus bar assembly 40 will not additionally occupy the space of the box body 20 in the second direction Y, so that the battery device 100 maintains a high volume energy density. Introducing the bus bar assembly 40 in this embodiment will not increase the size of the box body 20 along the second direction Y.

[0087] According to some embodiments of the present application, as Figure 7 、 Figure 8 and Figure 9 shown, at one end of each body 1111 facing away from the bottom plate 21, a second avoidance notch 1117 is provided, and a part of the busbar assembly 40 is disposed in the second avoidance notch 1117.

[0088] The second avoidance notch 1117 penetrates through two opposite surfaces of the body 1111 along the first direction X. The busbar assembly 40 extends from one side of the heat exchange assembly 10 to the other side of the heat exchange assembly 10, and sequentially passes through the second avoidance notches 1117 of each body 1111.

[0089] Taking the axial section perpendicular to the first direction X as the axial section, a part of the axial section of the busbar assembly 40 at the second avoidance notch 1117 may be located in the second avoidance notch 1117, or all of the axial section of the busbar assembly 40 at the second avoidance notch 1117 may be located in the second avoidance notch 1117. As an example, as Figure 9 shown, the first busbar 41 entirely passes through the second avoidance notch 1117, and the second busbar 42 is not located in the second avoidance notch 1117.

[0090] In this embodiment, a part of the busbar assembly 40 is disposed in the second avoidance notch 1117, and the space of the box body 20 occupied by the heat exchange unit 11 along the third direction Z is used to accommodate at least a part of the busbar assembly 40. In this way, the occupation of the space of the box body 20 by the busbar assembly 40 along the third direction Z can be reduced, or the busbar assembly 40 does not additionally occupy the space of the box body 20 along the third direction Z, improving the space utilization rate in the third direction Z of the box body 20. While introducing the busbar assembly 40, this embodiment can also compress the total size of the busbar assembly 40 and the heat exchange assembly 10 in the third direction Z, so that the height of the box body 20 can be smaller.

[0091] According to some embodiments of the present application, the battery cell 30 may include two first surfaces 31 disposed opposite to each other along the first direction X and two second surfaces 32 disposed opposite to each other along the second direction Y. The area of the first surface 31 is larger than the area of the second surface 32, and the two surfaces of each heat exchange element 112 disposed opposite to each other along the first direction X may be parallel to the first surface 31.

[0092] The first surfaces 31 of a plurality of battery cells 30 arranged in sequence along the first direction X are disposed opposite to each other, and the second surfaces 32 of a plurality of battery cells 30 arranged in sequence along the second direction Y are disposed opposite to each other. It can be understood that the first surface 31 is the surface with the largest area (i.e., the large surface) on the battery cell.

[0093] In some embodiments, at least one surface of each heat exchange member 112 is in contact with the first surface 31 of the battery cell 30 to achieve large-area heat exchange. As an example, both surfaces of each heat exchange member 112 are in contact with the first surface 31 of the battery cell 30. As an example, when the number of the heat exchange units 11 is greater than or equal to 3, for any three adjacent heat exchange units 11, both surfaces of the heat exchange member 112 of the middle heat exchange unit 11 are in contact with the first surface 31 of the battery cell 30, the surface of the heat exchange member 112 of the heat exchange unit 11 closest to the first wall 22 facing the heat exchange members 112 of the other heat exchange units 11 is in contact with the first surface 31 of the battery cell 30, and the surface of the heat exchange member 112 of the heat exchange unit 11 closest to the first wall 22 facing away from the heat exchange members 112 of the other heat exchange units 11 is not in contact with the battery cell 30, the surface of the heat exchange member 112 of the heat exchange unit 11 closest to the second wall 23 facing the heat exchange members 112 of the other heat exchange units 11 is in contact with the first surface 31 of the battery cell 30, and the surface of the heat exchange member 112 of the heat exchange unit 11 closest to the second wall 23 facing away from the heat exchange members 112 of the other heat exchange units 11 is not in contact with the battery cell 30. In other words, each of the two first surfaces 31 of each battery cell 30 is in contact with the surface of a heat exchange member 112.

[0094] In this embodiment, the heat exchange member 112 exchanges heat with the first surface 31 of the battery cell 30. Since the area of the first surface 31 is larger than the area of the second surface 32, the heat exchange area is large and the heat exchange effect is better.

[0095] According to some embodiments of the present application, as Figure 5 and Figure 4 shown, along the second direction Y, the current collectors 111 of the multiple heat exchange units 11 can all be located in the middle of the heat exchange assembly 10. That is, the current collector 111 is located in the middle of the heat exchange unit 11 in the second direction Y, rather than being arranged deviating from the middle of the heat exchange unit 11. In this example, the two heat exchange members 112 located on both sides of the current collector 111 can be symmetrically arranged about the center line of the current collector 111. This embodiment enables the heat exchange unit 11 to exchange heat with a row of battery cells 30 evenly, which is beneficial to optimizing the temperature regulation effect and the heat equalization effect.

[0096] The number of the heat exchange assemblies 10 is not limited. For example, it can be Figure 3 the one shown. Or, it can also be multiple, and the multiple heat exchange assemblies 10 are arranged in sequence along the second direction Y. Among them, each heat exchange assembly 10 can be symmetrically arranged about the central axis of the liquid inlet flow channel 12.

[0097] According to some embodiments of the present application, when there is one heat exchange assembly 10, please refer to Figure 2 and Figure 3 , the heat exchange unit 11, the reinforcing rib 211, and the busbar assembly 40 can be symmetrically arranged about the central plane S, and the central plane S is a plane passing through the center of the box body 20 and perpendicular to the second direction Y.

[0098] The central plane S of the box body 20 can be a plane perpendicular to the second direction Y and passing through the geometric center of the box body 20, and the heat exchange unit 11 is symmetrically arranged with respect to the central plane S. In this embodiment, the liquid inlet pipe 1112 and the liquid outlet pipe 1113 are also symmetrically arranged with respect to the central plane S, the liquid inlet pipe 1112 and the liquid outlet pipe 1113 are also located in the middle of the box body 20 along the second direction Y, and the structures of the first heat exchange member 112a and the second heat exchange member 112b are the same.

[0099] The reinforcing ribs 211 and the current collecting assembly 40 can also be symmetrically arranged with respect to the central plane S, then the reinforcing ribs 211 and the current collecting assembly 40 are also located in the middle of the box body 20 along the second direction Y.

[0100] Benefiting from the symmetrical arrangement of the heat exchange unit 11 with respect to the central plane S, the number of battery cells 30 corresponding to each first heat exchange member 112a and the corresponding second heat exchange member 112b is the same, which is beneficial to making the heat equalizing effects of the first heat exchange member 112a and the second heat exchange member 112b equivalent. In this embodiment, the reinforcing ribs 211 are located in the middle of the box body 20 along the second direction Y, which is beneficial to further improving the structural rigidity and anti-deformation ability of the box body 20.

[0101] According to some embodiments of the present application, as Figure 10 shown, two partition plates (both a single "partition plate 26" or two "partition plates 26" are collectively referred to as "partition plates 26") can also be provided in the box body 20, and the two partition plates 26 divide the internal space of the box body 20 into a first accommodation chamber 27, a second accommodation chamber 28, and a third accommodation chamber 29 arranged in sequence along the first direction X. A plurality of battery cells 30 and the heat exchange assembly 10 are arranged in the second accommodation chamber 28, and one end of the reinforcing rib 211 along the first direction X is fixedly connected to the partition plate 26 (i.e., Figure 10 the rightmost partition plate 26) located between the second accommodation chamber 28 and the third accommodation chamber 29.

[0102] The two partition plates 26 can be arranged opposite to each other and parallel to each other along the first direction X, and one end of the reinforcing rib 211 along the first direction X is fixedly connected to one of the two partition plates 26 that is closer to the third accommodation chamber 29 (i.e., Figure 10 the rightmost partition plate 26). In some embodiments, the other end of the reinforcing rib 211 along the first direction X can be fixedly connected to one of the two partition plates 26 that is closer to the first accommodation chamber 27 (i.e., Figure 10 the leftmost partition plate 26).

[0103] Figure 11 For Figure 10 the partial schematic diagram of the current collecting assembly and the box body in the battery device shown. As an alternative, in some embodiments, as Figure 11As shown, one of the two partition plates 26 closer to the first accommodation chamber 27 includes a first sub-partition plate 261 and a second sub-partition plate 262 that are spaced apart along the second direction Y. The other end of the reinforcing rib 211 along the first direction X can be located between the first sub-partition plate 261 and the second sub-partition plate 262. Among them, welding, occupying, clamping, screwing, etc. can be used to realize the fixed connection between the reinforcing rib 211 and the partition plate 26.

[0104] In this embodiment, by arranging two partition plates 26 in the box body 20, and a plurality of battery cells 30 are located between the two partition plates 26. The battery cells 30 will expand during operation, and the two partition plates 26 can limit the expansion of the plurality of battery cells 30. By making the fixed connection between the reinforcing rib 211 and the partition plate 26, the structural stability of the partition plate 26 can be improved, so that the partition plate 26 can reliably limit the expansion of the plurality of battery cells 30.

[0105] According to some embodiments of the present application, please combine Figures 2 to 4 , the battery device 100 may further include an input pipe 60 and an output pipe 70 arranged in the first accommodation chamber 27 and extending along the first direction X. One end of the input pipe 60 is communicated with the liquid inlet flow channel 12, one end of the output pipe 70 is communicated with the liquid outlet flow channel 13, and the other end of the input pipe 60 is used for communicating with a liquid supply flow path located outside the box body 20.

[0106] The input pipe 60 connects the liquid supply flow path and the liquid inlet flow channel 12, and the output pipe 70 is used to export the heat exchange medium in the liquid outlet flow channel 13 to the outside of the box body 20. The first accommodation chamber 27 is used to accommodate the input pipe 60 and the output pipe 70, and the third accommodation chamber 29 can be used to accommodate the electrical components (such as a battery management system, etc.) of the battery device 100.

[0107] In some embodiments, as Figure 11 shown, one of the two partition plates 26 closer to the first accommodation chamber 27 includes a first sub-partition plate 261 and a second sub-partition plate 262 that are spaced apart along the second direction Y. The input pipe 60 and the output pipe 70 can also pass through between the first sub-partition plate 261 and the second sub-partition plate 262, that is, the interval between the first sub-partition plate 261 and the second sub-partition plate 262 is used to avoid the input pipe 60 and the output pipe 70.

[0108] On the premise that the liquid inlet end of the input pipe 60 and the liquid outlet end of the output pipe 70 are located in the middle of the first wall 22, it can be understood that in the technical solution where the liquid inlet flow channel 12 and the liquid outlet flow channel 13 are respectively arranged on both sides of all battery cells 30 along the second direction Y, from the liquid inlet end to one end connecting the liquid inlet flow channel 12, the input pipe 60 is bent and extended, and from one end connecting the liquid outlet flow channel 13 to the liquid outlet end, the output pipe 70 is bent and extended, resulting in a relatively large length of the input pipe 60 and the output pipe 70 and a relatively large space occupied in the box body 20. Moreover, due to the large lengths of the input pipe 60 and the output pipe 70, the input pipe 60 and the output pipe 70 are both formed by connecting multiple pipe bodies with connecting pieces, and the connecting pieces also occupy the space in the box body 20.

[0109] In this embodiment, the input pipe 60 and the output pipe 70 both extend linearly. In this way, the input pipe 60 and the output pipe 70 have a relatively small length and occupy a smaller space in the box body 20, so as to make full use of the space in the box body 20 to accommodate the battery cells 30, which is beneficial to improving the volumetric energy density of the battery device 100. Moreover, since the heat exchange medium in the input pipe 60 and the output pipe 70 flows linearly and the flow path is short in this embodiment, the pressure drop is small and the flow resistance is small. Thanks to the relatively small lengths of the input pipe 60 and the output pipe 70, no connecting pieces need to be provided, which can save the space occupied by the connecting pieces, is beneficial to further improving the space utilization rate in the box body 20, and further beneficial to improving the volumetric energy density.

[0110] According to some embodiments of the present application, as Figure 3 and Figure 10 shown, the battery device 100 may further include two limiting members 50 located on the side of the bus bar assembly 40 facing away from the bottom plate 21, and the two limiting members 50 correspond to the two partition plates 26 one by one. Each limiting member 50 straddles both sides of the bus bar assembly 40 at both ends along the second direction Y, and both ends of each limiting member 50 are fixedly connected to the corresponding partition plate 26 to limit the movement of the bus bar assembly 40 toward the side facing away from the bottom plate 21.

[0111] Both ends of the bus bar assembly 40 respectively correspond to the first accommodation chamber 27 and the third accommodation chamber 29. In some embodiments, both ends of the bus bar assembly 40 along the first direction X can be placed on the partition plate 26. In some embodiments, as Figure 11 shown, one of the two partition plates 26 closer to the first accommodation chamber 27 includes a first sub-partition plate 261 and a second sub-partition plate 262 arranged at intervals along the second direction Y. One end of the bus bar assembly 40 corresponding to the first accommodation chamber 27 can be located between the first sub-partition plate 261 and the second sub-partition plate 262, and one end of the bus bar assembly 40 corresponding to the third accommodation chamber 29 can be placed on the partition plate 26 between the second accommodation chamber 28 and the third accommodation chamber 29. Both ends of the limiting member 50 and the partition plate 26 can be fixedly connected by any one of welding, screwing, clamping, bonding and other methods.

[0112] In this embodiment, by introducing the limiting member 50, the limiting member 50 can limit the movement of the busbar assembly 40 toward the side away from the bottom plate 21 and can limit the movement of the busbar assembly 40 along the second direction Y, so as to improve the installation reliability of the busbar assembly 40 and reduce the short - circuit risk caused by the displacement of the busbar assembly 40 contacting other electrical components.

[0113] An embodiment of the second aspect of the present application provides an electrical device, which includes the battery device 100 in the above - mentioned embodiment, and the battery device 100 is used to provide electric energy.

[0114] Among them, the electrical device includes transportation tools (such as vehicle 1000, battery car, ship, spacecraft, etc.), display devices (such as mobile phone, tablet computer, notebook computer, etc.), electric toys, electric tools, etc. It can be understood that the electrical device provided by the present application, due to the application of any one of the above - mentioned battery devices 100, thus has all the beneficial effects of the above - mentioned battery device 100, which will not be elaborated here.

[0115] An embodiment of the third aspect of the present application provides an energy storage device, which includes the battery device 100 in the above - mentioned embodiment, and the battery device 100 is used for energy storage. The energy storage device can include but is not limited to centralized energy storage devices (such as container energy storage devices), distributed energy storage devices, movable energy storage devices, wearable energy storage devices, etc. It can be understood that the energy storage device provided by the present application, due to the application of any one of the above - mentioned battery devices 100, thus has all the beneficial effects of the above - mentioned battery device 100, which will not be elaborated here.

[0116] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above - mentioned and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically given below.

[0117] A specific embodiment of the present application is described below. It should be understood that this specific embodiment is only described for the purpose of illustration and should not be construed as a limitation of the present application.

[0118] Such as Figures 2 to 11As shown, the battery device 100 includes a box body 20 and a heat exchange component 10 accommodated in the box body 20. The heat exchange component 10 includes 32 heat exchange units 11 arranged at intervals in sequence along the first direction X. Each heat exchange unit 11 includes a current collector 111, a first heat exchange member 112a, and a second heat exchange member 112b. The first heat exchange member 112a and the second heat exchange member 112b are respectively connected to both sides of the current collector 111 along the second direction Y. The heat exchange component 10 is symmetrically arranged with respect to the central plane S, and the central plane S is a plane passing through the center of the box body 20 and perpendicular to the second direction Y.

[0119] Between any two adjacent first heat exchange members 112a, there are three battery cells 30 arranged at intervals in sequence along the second direction Y. Between any two adjacent second heat exchange members 112b, there are three battery cells 30 arranged at intervals in sequence along the second direction Y. The battery cell 30 is in a cuboid shape. The first direction X is the thickness direction of the battery cell 30, and the second direction Y is the length direction of the battery cell 30. The battery cell 30 has two opposite first surfaces 31 along the first direction X, and the first surfaces 31 are large surfaces. Any two adjacent first heat exchange members 112a are in contact with the two first surfaces of the battery cell 30 located between these two first heat exchange members 112a, and any two adjacent second heat exchange members 112b are in contact with the two first surfaces of the battery cell 30 located between these two second heat exchange members 112b.

[0120] Each current collector 111 includes a body 1111, a liquid inlet pipe 1112, and a liquid outlet pipe 1113 provided on the body 1111. The body 1111, the liquid inlet pipe 1112, and the liquid outlet pipe 1113 are integrally injection-molded by an injection molding process. The liquid inlet pipe 1112 and the liquid outlet pipe 1113 are arranged overlappingly along the third direction Z, and the liquid inlet pipe 1112 is located above the liquid outlet pipe 1113. The current collectors 111 of each heat exchange unit 11 are arranged opposite to each other in sequence along the first direction X. All the liquid inlet pipes 1112 are coaxially arranged to form a liquid inlet flow channel 12, and all the liquid outlet pipes 1113 are coaxially arranged to form a liquid outlet flow channel 13. There are two flow channels arranged in sequence along the third direction Z in both the first heat exchange member 112a and the second heat exchange member 112b. The flow channels extend along the second direction Y, and the two flow channels are connected in series in sequence to form a heat exchange flow channel 1121. The flow directions of the heat exchange media in the two flow channels are opposite. The third direction Z is the height direction of the battery cell 30.

[0121] Two first holes 1114 and two second holes 1115 are provided on the current collector 111. The first heat exchange member 112a and the second heat exchange member 112b are respectively communicated with the inflow end of the heat exchange flow channel 1121 through one first hole 1114, and the first heat exchange member 112a and the second heat exchange member 112b are respectively communicated with the outflow end of the heat exchange flow channel 1121 through one second hole 1115.

[0122] The body 1111 has a first side face and a second side face facing away from each other in the second direction Y, and the liquid inlet pipe 1112 and the liquid outlet pipe 1113 are located between the first side face and the second side face.

[0123] Two partitions 26 are provided in the box body 20 and arranged opposite to each other in the first direction X. The two partitions 26 divide the internal space of the box body 20 into a first accommodation chamber 27, a second accommodation chamber 28, and a third accommodation chamber 29 arranged in sequence in the first direction X. The heat exchange assembly 10 and all battery monomers 30 are located in the second accommodation chamber 28. The first accommodation chamber 27 accommodates an input pipe 60 and an output pipe 70 extending in the first direction X. The liquid outlet end of the input pipe 60 is communicated with the liquid inlet flow channel 12, and the liquid inlet end of the output pipe 70 is communicated with the liquid outlet flow channel 13.

[0124] Reinforcing ribs 211 are protrudingly provided on the bottom plate 21 of the box body 20. The reinforcing ribs 211 are located in the second accommodation chamber 28 and extend in the first direction X. One end of the reinforcing ribs 211 is welded to the partition 26 located between the second accommodation chamber 28 and the third accommodation chamber 29. One end of each body 1111 facing the bottom plate 21 may be provided with a first avoidance notch 1116. The reinforcing ribs 211 extend from one end of the heat exchange assembly 10 to the other end in the first direction X and sequentially pass through the first avoidance notches 1116 of each body 1111. The reinforcing ribs 211 are symmetrically arranged with respect to the central plane S, and the reinforcing ribs 211 are located between the first side face and the second side face.

[0125] A busbar assembly 40 is further provided in the box body 20. The busbar assembly 40 is arranged on the side of the body 1111 facing away from the bottom plate 21. The busbar assembly 40 extends in the first direction X. One end of the busbar assembly 40 corresponds to the first accommodation chamber 27, and the other end corresponds to the third accommodation chamber 29. The busbar assembly 40 is located between the first side face and the second side face.

[0126] The busbar assembly 40 includes a first busbar 41 and a second busbar 42. The first busbar 41 connects the battery monomer 30 and the positive terminal of the high-voltage connector. The second busbar 42 connects the battery monomer 30 and the negative terminal of the high-voltage connector. The first busbar 41 and the second busbar 42 are arranged at intervals in the third direction Z. The second busbar 42 is located on the side of the first busbar 41 facing away from the bottom plate 21. One end of each body 1111 facing away from the bottom plate 21 may be provided with a second avoidance notch 1117. The first busbar 41 extends from one end to the other end in the first direction X and sequentially passes through the second avoidance notches 1117 of each body 1111. The second busbar 42 is not located in the second avoidance notch 1117.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that, Comprising: A box body; A heat exchange assembly, accommodated in the box body, the heat exchange assembly includes a plurality of heat exchange units arranged at intervals in a first direction, each heat exchange unit includes a current collector and two heat exchange elements, the two heat exchange elements are respectively a first heat exchange element and a second heat exchange element, the first heat exchange element and the second heat exchange element are respectively connected to two sides of the current collector along a second direction, the current collector includes a liquid inlet pipe and a liquid outlet pipe arranged at intervals in a third direction, the liquid inlet pipes of the plurality of heat exchange units are connected in sequence along the first direction to form a liquid inlet flow channel, the liquid outlet pipes of the plurality of heat exchange units are connected in sequence along the first direction to form a liquid outlet flow channel, and the orthographic projection of the liquid inlet flow channel on the bottom plate surface of the box body and the orthographic projection of the liquid outlet flow channel on the bottom plate surface at least partially overlap, a heat exchange flow channel is formed inside the heat exchange element, the inflow end of the heat exchange flow channel is communicated with the liquid inlet flow channel, and the outflow end of the heat exchange flow channel is communicated with the liquid outlet flow channel; the first direction, the second direction and the third direction are perpendicular to each other in pairs; A plurality of battery cells, accommodated in the box body, and each heat exchange element exchanges heat with at least one battery cell.

2. The battery device according to claim 1, characterized in that, The central axis of the liquid inlet flow channel and the central axis of the liquid outlet flow channel are located in the same plane, and the plane is perpendicular to the second direction.

3. The battery device according to claim 1, characterized in that, Along the second direction, the current collectors of the plurality of heat exchange units are all located in the middle of the heat exchange assembly.

4. The battery device according to claim 1, characterized in that The battery device further includes a busbar assembly arranged in the box body; reinforcing ribs are provided on the bottom plate; the busbar assembly, the current collector and the reinforcing ribs are arranged in overlapping sequence along the third direction; The current collector includes a body, the liquid inlet pipe and the liquid outlet pipe are arranged on the body, the heat exchange element is connected to the body, and the body has a first side face and a second side face facing away from each other along the second direction.

5. The battery device according to claim 4, wherein The reinforcing rib extends from the inlet end of the liquid inlet flow channel to the outlet end of the liquid inlet flow channel along the first direction, and the reinforcing rib is arranged on the side of the heat exchange unit facing the bottom plate; the reinforcing rib is located between the first side face and the second side face.

6. The battery device according to claim 5, characterized in that, Each end of the body facing the bottom plate is provided with a first avoidance notch, and a part of the reinforcing rib is inserted into the first avoidance notch.

7. The battery device according to claim 4, wherein, The busbar assembly is arranged on the side of the heat exchange unit facing away from the bottom plate, and the busbar assembly extends from one side of the heat exchange assembly to the other side along the first direction; the busbar assembly is located between the first side face and the second side face.

8. The battery device according to claim 7, wherein Each end of the body facing away from the bottom plate is provided with a second avoidance notch, and a part of the busbar assembly is inserted into the second avoidance notch.

9. The battery device according to claim 4, wherein The heat exchange unit, the reinforcing rib and the busbar assembly are symmetrically arranged with respect to a central plane, and the central plane is a plane passing through the center of the box body and perpendicular to the second direction.

10. The battery device according to claim 4, characterized in that, Two partition plates are arranged in the box body. The two partition plates divide the inner space of the box body into a first accommodation chamber, a second accommodation chamber, and a third accommodation chamber that are sequentially arranged along the first direction. The plurality of battery cells and the heat exchange assembly are arranged in the second accommodation chamber. One end of the reinforcing rib along the first direction is fixedly connected to the partition plate located between the second accommodation chamber and the third accommodation chamber.

11. The battery device according to claim 10, wherein, The battery device further includes an input pipe and an output pipe that are arranged in the first accommodation chamber and extend along the first direction. One end of the input pipe is communicated with the liquid inlet flow channel, one end of the output pipe is communicated with the liquid outlet flow channel, and the other end of the input pipe is used for communicating with a liquid supply flow path located outside the box body.

12. The battery device according to claim 10, characterized in that, The battery device further includes two limiting members located on the side of the bus bar assembly facing away from the bottom plate. The two limiting members correspond to the two partition plates one by one; both ends of each limiting member in the second direction straddle both sides of the bus bar assembly, and both ends of each limiting member are fixedly connected to the corresponding partition plate to limit the bus bar assembly from moving towards the side facing away from the bottom plate.

13. The battery device according to any one of claims 1-12, characterized in that, The battery cell includes two first surfaces arranged opposite to each other along the first direction and two second surfaces arranged opposite to each other along the second direction. The area of the first surface is larger than the area of the second surface. Two surfaces of each heat exchange member arranged opposite to each other along the first direction are parallel to the first surface.

14. An electrical device, characterized in that, The electrical device includes the battery device according to any one of claims 1 to 13, and the battery device is used to provide electrical energy.

15. An energy storage device, characterized in that, The energy storage device includes the battery device according to any one of claims 1 to 13, and the battery device is used to store electrical energy.

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