Battery pack, electric apparatus, and energy storage device

Abstract

The present application relates to the technical field of batteries, and in particular to a battery pack, an electric apparatus, and an energy storage device. The battery pack of the present application comprises a battery unit and a heat exchange assembly, wherein the battery unit comprises a plurality of battery cells stacked in a first direction, the heat exchange assembly comprises at least one heat exchange flat tube, the heat exchange flat tube comprises a plurality of bending sections and a plurality of extension sections, the extension sections and the bending sections are sequentially and alternately arranged and are in communication with each other, two ends of any one bending section are respectively provided with one extension section, the plurality of extension sections are arranged in a direction intersecting the first direction, and the battery unit exchanges heat with all the extension sections of the at least one heat exchange flat tube respectively. The battery pack of the present application can increase the heat exchange area between the heat exchange flat tube and the battery unit, thereby increasing the heat exchange efficiency between the heat exchange flat tube and the battery unit.

Description

Battery pack, electrical equipment and energy storage device

[0001] Cross-reference to Related Applications

[0002] This application claims priority to and the benefit of the following patent applications, the entire contents of which are incorporated herein by reference:

[0003] Chinese Patent Application No. 202411045467.8, filed on July 31, 2024, entitled “Battery pack, electrical equipment and energy storage device” with the China National Intellectual Property Office. TECHNICAL FIELD

[0004] The present application relates to the technical field of batteries, and in particular to a battery pack, electrical equipment and energy storage device. BACKGROUND

[0005] With the development of the new energy industry, new energy batteries more often use bent flat tubes to dissipate heat from battery cells. However, the existing bent flat tubes have a large spacing between adjacent tube sections, which reduces the effective coverage area of the bent flat tubes, thereby reducing the heat exchange area and efficiency of the bent flat tubes and battery cells. SUMMARY

[0006] In view of the defects of the prior art, the purpose of the present application is to provide a battery pack, electrical equipment and energy storage device that can effectively solve the problem of low heat exchange efficiency of the bent flat tube.

[0007] A first aspect of the present application discloses a battery pack, comprising:

[0008] a battery cell comprising a plurality of battery monomers arranged in a stack along a first direction;

[0009] a heat exchange assembly comprising at least one heat exchange flat tube, the heat exchange flat tube comprising a plurality of bent sections and a plurality of extension sections, the extension sections and the bent sections being arranged alternately and in communication, each bent section having two extension sections at its two ends, the plurality of extension sections being arranged along a direction intersecting the first direction, and the battery cell and all the extension sections of the at least one heat exchange flat tube being in heat exchange respectively.

[0010] According to the battery pack of the present application, by connecting the plurality of extension sections through the bent sections in sequence and by having the battery cell and all the extension sections of the at least one heat exchange flat tube in heat exchange respectively, the heat exchange area of the heat exchange flat tube and the battery cell can be increased, thereby improving the heat exchange efficiency of the heat exchange flat tube and the battery cell.

[0011] In some embodiments of the present application, the heat exchange flat tube comprises an inlet and an outlet, the number of the bending segments is 2N+1, and the inlet and the outlet are arranged on the same side of the heat exchange flat tube along the first direction, wherein N is a positive integer greater than or equal to 1.

[0012] By setting the number of the bending segments as 2N+1, i.e. setting the number of the bending segments as an odd number, and connecting one extension segment to each end of any bending segment, the extension segments at the two ends are respectively provided with the inlet and the outlet, so that the inlet and the outlet are arranged on the same side of the heat exchange flat tube along the first direction, thereby facilitating the arrangement of pipelines respectively communicating with the inlet and the outlet on the same side of the heat exchange flat tube, and facilitating the input and output of the heat exchange medium into the heat exchange flat tube.

[0013] In some embodiments of the present application, the bending segments comprise at least a first bending segment, a second bending segment and a third bending segment, and the extension segments comprise at least a first extension segment, a second extension segment, a third extension segment and a fourth extension segment, wherein the first extension segment, the fourth extension segment, the third extension segment and the second extension segment are arranged in sequence, the first extension segment and the second extension segment are connected through the first bending segment, the second extension segment and the third extension segment are connected through the second bending segment, and the third extension segment and the fourth extension segment are connected through the second bending segment.

[0014] The first extension segment, the second extension segment, the third extension segment and the fourth extension segment collectively perform heat exchange on the same battery monomer, thereby improving the heat exchange area and the heat exchange efficiency of the heat exchange flat tube and the battery monomer, and since the first extension segment, the second extension segment, the third extension segment and the fourth extension segment are connected in sequence through three bending segments, the first extension segment and the fourth extension segment have the largest temperature difference. By arranging the first extension segment, the fourth extension segment, the third extension segment and the second extension segment in sequence, the heat exchange between the heat exchange flat tube and the battery unit can be more uniform, thereby improving the temperature consistency at different positions of the battery unit.

[0015] In some embodiments of the present application, the heat exchange flat tube comprises an inlet and an outlet, the number of the bending segments is 2N, and the inlet and the outlet are arranged on the two sides of the heat exchange flat tube along the first direction, wherein N is a positive integer greater than or equal to 1.

[0016] By setting the number of the bending segments as 2N, i.e. setting the number of the bending segments as an even number, and connecting one extension segment to each end of any bending segment, the extension segments at the two ends are respectively provided with the inlet and the outlet, so that the inlet and the outlet are arranged on the two sides of the heat exchange flat tube along the first direction, thereby facilitating the arrangement of pipelines respectively communicating with the inlet and the outlet on the two sides of the heat exchange flat tube, and facilitating the input and output of the heat exchange medium into the heat exchange flat tube.

[0017] In some embodiments of the present application, the heat exchange assembly comprises a plurality of heat exchange flat tubes, and the plurality of heat exchange flat tubes are arranged at intervals along a second direction, and the second direction intersects the first direction.

[0018] By arranging the plurality of heat exchange flat tubes, the plurality of heat exchange flat tubes can exchange heat with the battery cells respectively, thereby improving the heat exchange efficiency of the heat exchange assembly.

[0019] In some embodiments of the present application, the heat exchange assembly further comprises a liquid inlet header and a liquid outlet header, and the heat exchange flat tubes comprise liquid inlets and liquid outlets, and the liquid inlets of any heat exchange flat tube are respectively connected to the liquid inlet header, and the liquid outlets of any heat exchange flat tube are respectively connected to the liquid outlet header.

[0020] By connecting the liquid inlets of any heat exchange flat tube to the liquid inlet header respectively, the heat exchange medium can be input to the plurality of heat exchange flat tubes through the liquid inlet header, and by connecting the liquid outlets of any heat exchange flat tube to the liquid outlet header respectively, the heat exchange medium of the plurality of heat exchange flat tubes can be output through the liquid outlet header, thereby improving the flowability of the heat exchange medium in the heat exchange flat tubes.

[0021] In some embodiments of the present application, along the first direction, the liquid inlet header and the liquid outlet header are arranged on the same side of the heat exchange flat tubes, and the liquid inlet header and the liquid outlet header are arranged in abutment or at intervals along a third direction, and the third direction is perpendicular to the first direction and the second direction respectively.

[0022] Since the liquid inlet header and the liquid outlet header are arranged on the same side of the heat exchange flat tubes along the first direction, in order to reduce the mutual shielding of the liquid inlet header and the liquid outlet header along the first direction, the liquid inlet header and the liquid outlet header are arranged in abutment or at intervals along the third direction, so as to connect the liquid inlets to the liquid inlet header and connect the liquid outlets to the liquid outlet header.

[0023] In some embodiments of the present application, the heat exchange assembly further comprises a liquid inlet connector and a liquid outlet connector, the liquid inlet connector is connected to the liquid inlet header, and the liquid outlet connector is connected to the liquid outlet header, wherein,

[0024] The liquid inlet connector is arranged at one end of the liquid inlet header along the second direction, and the liquid outlet connector is arranged at an end of the liquid outlet header away from the liquid inlet connector along the second direction;

[0025] Alternatively, the liquid inlet connector is arranged at one end of the liquid inlet header along the second direction, and the liquid outlet connector is arranged at an end of the liquid outlet header close to the liquid inlet connector along the second direction;

[0026] Alternatively, the liquid inlet connector is arranged at a middle position of the liquid inlet header along the second direction, and the liquid outlet connector is arranged at a middle position of the liquid outlet header along the second direction.

[0027] The liquid inlet collecting pipe can be connected with the external liquid supply pipeline through a liquid inlet joint, and the liquid outlet collecting pipe can be connected with the external liquid return pipeline through a liquid outlet joint, thereby improving the flowability of the heat exchange medium in the heat exchange flat tube. The liquid inlet joint and the liquid outlet joint can be reasonably arranged according to the arrangement position of the external liquid supply pipeline and the external liquid return pipeline or the mounting position of the battery, thereby facilitating the connection of the liquid inlet joint and the liquid outlet joint with the external pipeline.

[0028] In some embodiments of the present application, the battery pack includes a plurality of battery units arranged along a second direction, and the battery pack further includes a plurality of heat exchange flat tubes arranged along the second direction; wherein at least one side surface of the battery unit and all extension sections of at least one heat exchange flat tube are respectively heat exchanged along the second direction, a plurality of extension sections in the same heat exchange flat tube are arranged along a third direction, and / or at least one side surface of the battery unit and all extension sections of at least one heat exchange flat tube are respectively heat exchanged along the third direction, and a plurality of extension sections in the same heat exchange flat tube are arranged along the second direction, wherein the second direction intersects the first direction, and the third direction is perpendicular to the first direction and the second direction.

[0029] Since the plurality of battery cells in the battery unit are arranged along the first direction, at least one side surface of the battery unit and all extension sections of at least one heat exchange flat tube are respectively heat exchanged along the second direction, the heat exchange flat tube can respectively heat exchange all battery cells in the battery unit, thereby improving the heat exchange efficiency of the battery unit; since the plurality of battery cells in the battery unit are arranged along the first direction, at least one side surface of the battery unit and all extension sections of at least one heat exchange flat tube are respectively heat exchanged along the third direction, the heat exchange flat tube can respectively heat exchange all battery cells in the battery unit, thereby improving the heat exchange efficiency of the battery unit.

[0030] In some embodiments of the present application, the bending radius of the bending section is R, and the size of the extension section along the arrangement direction of the plurality of extension sections is L1, wherein the ratio of R to L1 is 1.5-5.5.

[0031] By setting the ratio of R to L1 to be 1.5-5.5, the bending radius of the bending section can be reduced, thereby the interval size between adjacent extension sections along the arrangement direction of the plurality of extension sections can be reduced, and further, a larger number of extension sections can be arranged along the arrangement direction of the plurality of extension sections, thereby improving the heat exchange area and the heat exchange efficiency between the heat exchange flat tube and the battery unit.

[0032] In some embodiments of the present application, the value range of L1 is 10mm-100mm.

[0033] According to the above size setting, the size L1 of the extension section can be reduced, so that the heat exchange finned tube can be bent with a smaller bending radius, and the number of extension sections for heat exchange with the battery cell is increased, and the heat exchange area and heat exchange efficiency between the heat exchange finned tube and the battery cell are improved.

[0034] In some embodiments of the present application, the size of the battery cell along the arrangement direction of the plurality of extension sections is L2, and the ratio of L2 to L1 is in the range of 5.5-10.

[0035] By setting L1 to be less than L2, and the ratio of L2 to L1 in the range of 5.5-10, the plurality of extension sections can be arranged to exchange heat with the same battery cell along the arrangement direction of the plurality of extension sections, so that the heat exchange area and heat exchange efficiency between the heat exchange finned tube and the battery cell are improved.

[0036] The second aspect of the present application provides a power utilization device, which comprises the battery pack of any one of the above.

[0037] The third aspect of the present application provides an energy storage device, which comprises the battery pack of any one of the above.

[0038] The above description is only a summary of the technical solutions of the present application, in order to enable the technical means of the present application to 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 easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0039] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Moreover, the same reference numerals in the attached drawings indicate the same or similar components. In the drawings:

[0040] FIG. 1 is a structural schematic diagram of a vehicle according to an embodiment of the present application;

[0041] FIG. 2 is an exploded structural schematic diagram of a battery pack according to an embodiment of the present application;

[0042] FIG. 3 is a structural schematic diagram of a battery cell according to an embodiment of the present application;

[0043] FIG. 4 is an exploded structural schematic diagram of a battery cell according to an embodiment of the present application;

[0044] FIG. 5 is a structural schematic diagram of a heat exchange assembly according to an embodiment of the present application;

[0045] Fig. 6 is a schematic diagram of the relative position structure between the heat exchange assembly and the bottom of the battery cell according to an embodiment of the present application;

[0046] Fig. 7 is a schematic diagram of the relative position structure between the heat exchange assembly and the battery cell according to another embodiment of the present application;

[0047] Fig. 8 is a schematic diagram of the structure of the heat exchange assembly according to another embodiment of the present application;

[0048] Fig. 9 is a schematic diagram of the A-A cross-sectional structure of the heat exchange assembly in Fig. 5;

[0049] Fig. 10 is a schematic diagram of the flow direction of the internal heat exchange medium of the heat exchange assembly according to an embodiment of the present application;

[0050] Fig. 11 is a schematic diagram of the structure of the heat exchange assembly according to another embodiment of the present application;

[0051] Fig. 12 is a schematic diagram of the structure of the heat exchange assembly according to another embodiment of the present application;

[0052] Fig. 13 is a schematic diagram of the structure of the heat exchange assembly according to another embodiment of the present application;

[0053] Fig. 14 is a schematic diagram of the structure of the energy storage device according to an embodiment of the present application.

[0054] The reference signs in the detailed description are as follows: 1, vehicle; 10, battery pack; 11, controller; 12, motor; 20, battery cell; 21, battery cell; 211, end cover; 212, shell; 213, electrode assembly; 214, electrode terminal; 30, heat exchange assembly; 31, heat exchange flat tube; 311, extension section; 3111, first extension section; 3112, second extension section; 3113, third extension section; 3114, fourth extension section; 312, bending section; 3121, first bending section; 3122, second bending section; 3123, third bending section; 32, liquid inlet header; 33, liquid outlet header; 34, liquid inlet joint; 35, liquid outlet joint; 40, box body; 41, box main body; 42, support plate; 2, energy storage container; 201, cabinet body; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0055] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and therefore cannot be used to limit the protection scope of the present application.

[0056] It should be noted that the technical terms or scientific terms used in the description of the embodiments of the present application should be understood as the general meaning understood by the person skilled in the art to which the embodiments of the present application belong, unless otherwise specified.

[0057] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0058] In addition, the technical terms "first", "second" and the like are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0059] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0060] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0061] At present, from the development of market situation, the application of power battery is more and more widely. Power battery is not only applied to energy storage power supply system of water power, fire power, wind power and solar power station, but also widely used in electric bicycle, electric motorcycle, electric vehicle and other electric vehicles, military equipment and aerospace and other fields.

[0062] With the development of new energy industry, new energy batteries are more used to fold flat tubes to dissipate heat from battery units. However, the existing adjacent tube segments of the folded flat tube have a large spacing size, which reduces the effective coverage area of the folded flat tube, thereby reducing the heat exchange area and efficiency of the folded flat tube and the battery unit.

[0063] To solve the problem of low heat exchange efficiency of the folded flat tube, the application provides a battery pack, an electric device with the battery pack and an energy storage device with the battery pack, which can increase the heat exchange area of the heat exchange flat tube and the battery monomer, thereby improving the heat exchange efficiency of the heat exchange flat tube and the battery monomer.

[0064] The battery pack in the application can be applied to various electric devices and energy storage devices using battery packs, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, electric vehicles, ships, spacecraft and energy storage batteries, etc. For example, spacecraft includes airplanes, rockets, space shuttles and spacecraft, etc. The battery pack is used to provide power for the above-mentioned electric devices and energy storage devices.

[0065] It should be understood that the technical solutions described in the embodiments of the application are not only limited to the above-mentioned battery pack, electric device and energy storage device, but also can be applied to all battery packs including heat exchange components and electric devices and energy storage devices using battery packs. However, for the sake of simplicity, the following embodiments are described by taking electric vehicles as an example.

[0066] The battery pack mentioned in the embodiments of the application can include one or more battery units for providing voltage and capacity. The battery unit is formed by arranging and fixing a plurality of battery monomers. As an example, the battery unit can be formed by bundling a plurality of battery monomers with a ribbon.

[0067] Fig. 1 is a schematic structural view of a vehicle 1 provided by some embodiments of the application. As shown in Fig. 1, the vehicle 1 can be a fuel automobile, a gas automobile or a new energy automobile, which can be a pure electric vehicle, a hybrid electric vehicle or an extended range vehicle, etc. The vehicle 1 is internally provided with a battery pack 10, which can be arranged at the bottom, head or tail of the vehicle 1. The battery pack 10 can be used for power supply of the vehicle 1, for example, the battery pack 10 can be used as the operating power source of the vehicle 1. The vehicle 1 can also include a controller 11 and a motor 12, the controller 11 being used to control the battery pack 10 to supply power to the motor 12, for example, for the working power demand of the vehicle 1 during starting, navigation and driving.

[0068] In some embodiments of the present application, the battery pack 10 can not only serve as the operating power source of the vehicle 1, but also serve as the driving power source of the vehicle 1, replacing or partially replacing the fuel or natural gas to provide driving power for the vehicle 1.

[0069] FIG. 2 is an exploded structural schematic diagram of the battery pack 10 according to an embodiment of the present application. FIG. 3 is a structural schematic diagram of the battery cell 20 according to an embodiment of the present application. As shown in FIGS. 2 and 3, in order to meet different power requirements, the battery pack 10 can include a plurality of battery monomers 21, which are the smallest units constituting the battery cell 20 or the battery pack. The plurality of battery monomers 21 can be connected in series and / or in parallel via electrode terminals to be applied to various application occasions. The battery mentioned in the present application includes the battery cell 20 or the battery pack. Among them, the plurality of battery monomers 21 can be connected in series or in parallel or in a mixed manner, and the mixed manner refers to a mixture of series connection and parallel connection. The battery pack 10 can also be referred to as a battery pack. In the embodiments of the present application, the plurality of battery monomers 21 can directly constitute the battery pack, or first constitute the battery cell 20, and then the battery cell 20 constitutes the battery pack.

[0070] As shown in FIGS. 2 and 3, the battery pack 10 can include a plurality of battery cells 20 and a box 40, and the plurality of battery cells 20 are accommodated inside the box 40. The box 40 is used to accommodate the battery monomer 21 or the battery cell 20 to reduce the influence of liquid or other foreign matters on the charging or discharging of the battery monomer 21. The box 40 can be a simple solid structure such as a cuboid or a cylinder or a sphere, or a complex solid structure composed of a cuboid or a cylinder or a sphere. The material of the box 40 can be an alloy material such as an aluminum alloy or a ferrous alloy, or a high polymer material such as polycarbonate or polyisocyanurate foam plastic, or a composite material such as glass fiber reinforced epoxy resin.

[0071] The battery cell 20 can include a plurality of battery monomers 21, which can be connected in series or in parallel or in a mixed manner to constitute the battery cell 20, and the plurality of battery cells 20 can be connected in series or in parallel or in a mixed manner to constitute the battery pack 10. The battery monomer 21 can be in the shape of a cylinder, a flat body, a cuboid or other shapes, which are not limited in the embodiments of the present application. The battery monomer 21 is generally divided into three types according to the packaging mode: cylindrical battery monomer, cuboid battery monomer and soft pack battery monomer, which are not limited in the embodiments of the present application. However, for the sake of simplicity, the following embodiments will be described by taking the cuboid battery monomer 21 as an example.

[0072] FIG. 4 is an exploded structural schematic diagram of the battery monomer 21 according to some embodiments of the present application. The battery monomer 21 refers to the smallest unit constituting the battery pack 10. As shown in FIG. 4, the battery monomer 21 includes an end cover 211, a shell 212 and an electrode assembly 213.

[0073] The end cover 211 refers to a component that covers the opening of the shell 212 to isolate the internal environment of the battery cell 21 from the external environment. Without limitation, the shape of the end cover 211 can be adapted to the shape of the shell 212 to fit the shell 212. Optionally, the end cover 211 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 211 is less likely to deform when subjected to extrusion collision, and the battery cell 21 can have higher structural strength and improved safety performance. The end cover 211 can be provided with functional components such as the electrode terminal 214. The electrode terminal 214 can be used to electrically connect with the electrode assembly 213 for outputting or inputting the electrical energy of the battery cell 21. In some embodiments, the end cover 211 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 21 when the internal pressure or temperature reaches a threshold value. In some embodiments, an insulating member can also be provided on the inner side of the end cover 211, which can be used to isolate the electrical connection components in the shell 212 from the end cover 211 to reduce the risk of short circuit. For example, the insulating member can be plastic, rubber, etc.

[0074] The shell 212 is a component for fitting the end cover 211 to form the internal environment of the battery cell 21, wherein the formed internal environment can be used to accommodate the electrode assembly 213, electrolyte (not shown in the figure), and other components. The shell 212 and the end cover 211 can be independent components, and an opening can be provided on the shell 212, and the end cover 211 is made to cover the opening to form the internal environment of the battery cell 21. Without limitation, the end cover 211 and the shell 212 can also be integrated, specifically, the end cover 211 and the shell 212 can first form a common connecting surface before other components enter the shell, and when it is necessary to seal the internal environment of the shell 212, the end cover 211 is made to cover the shell 212. The shell 212 can be of various shapes and sizes, such as cuboid, cylinder, hexagonal prism, etc. Specifically, the shape of the shell 212 can be determined according to the specific shape and size of the electrode assembly 213. The material of the shell 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0075] The electrode assembly 213 is a component in which electrochemical reactions occur in the battery cell 21. One or more electrode assemblies 213 can be contained within the case 212. The electrode assembly 213 is mainly formed by winding or layering a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active materials that constitute a main body of the electrode assembly 213, and portions without active materials that each constitute a tab (not shown in the drawings). The positive electrode tab and the negative electrode tab can be located together at one end of the main body or at opposite ends of the main body. During charging and discharging of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminals 214 to form a current loop.

[0076] In combination with FIGS. 2 and 5, in some embodiments of the present application, the battery pack 10 includes the battery unit 20 and the heat exchange assembly 30, the battery unit 20 includes a plurality of battery cells 21 arranged in a stack along a first direction X, and the heat exchange assembly 30 includes at least one heat exchange flat tube 31, the heat exchange flat tube 31 includes a plurality of bending sections 312 and a plurality of extension sections 311, the extension sections 311 and the bending sections 312 are arranged alternately and in communication, each of the bending sections 312 has two ends each provided with one of the extension sections 311, the plurality of extension sections 311 are arranged along a direction intersecting the first direction X, and the battery unit 20 and all of the extension sections 311 of the at least one heat exchange flat tube 31 exchange heat respectively.

[0077] Specifically, the heat exchange assembly 30 includes the heat exchange flat tube 31, which is configured to exchange heat with the battery cell 21 to adjust the temperature of the battery cell 21. The heat exchange flat tube 31 has an internal cavity structure to circulate a heat exchange medium. The heat exchange medium exchanges heat with the heat exchange flat tube 31 during the flow in the heat exchange flat tube 31 to adjust the temperature of the heat exchange flat tube 31. The heat exchange flat tube 31 exchanges heat with the battery cell 21 to further adjust the temperature of the battery cell 21. The heat exchange flat tube 31 has a substantially flat structure, has a cross section along a direction perpendicular to the extension direction of the heat exchange flat tube 31, and the cross section has two perpendicular directions, one of which has a larger dimension than the other. Optionally, the heat exchange flat tube 31 can be connected to the battery cell 21 in a close contact manner and directly exchange heat. Alternatively, the heat exchange flat tube 31 can be arranged at a distance from the battery cell 21 to exchange heat through air flow or through a heat conducting member.

[0078] Optionally, the first direction X can be one of a length direction of the battery pack 10 or a width direction of the battery pack 10. The battery pack 10 further includes a width direction and a height direction, and a size of the battery pack 10 along the length direction is greater than a size of the battery pack 10 along the width direction. The height direction of the battery pack 10 is perpendicular to the length direction and the width direction, and is generally arranged along a vertical direction. For the convenience of description, the first direction X is taken as the length of the battery pack 10, the second direction is taken as the width direction of the battery pack 10, and the third direction is taken as the height direction of the battery pack 10 as an example for description.

[0079] The heat exchange flat tube 31 can be one or more, and each heat exchange flat tube 31 is an integrally formed and shaped tubular structure.

[0080] In some embodiments of the present application, the heat exchange flat tube 31 includes a plurality of bending sections 312 and a plurality of extension sections 311, and the extension sections 311 and the bending sections 312 are alternately arranged and communicated in sequence, thereby forming a continuous and communicated heat exchange channel inside the heat exchange flat tube 31. Wherein, a plurality of means two or more than two. The number of bending sections 312 can be two, three or more, and the number of extension sections 311 is one more than the number of bending sections 312, which can be three, four or more, so that one extension section 311 is respectively arranged at both ends of each bending section 312, and the plurality of extension sections 311 are respectively communicated with the battery cells 20. Compared with the bending tube with only one bending part, the heat exchange area of the heat exchange flat tube 31 and the battery cells 20 can be increased, thereby improving the heat exchange efficiency of the heat exchange flat tube 31 and the battery cells 20.

[0081] In combination with FIGS. 2, 5 to 7, in some embodiments of the present application, the heat exchange flat tube 31 includes a liquid inlet (not shown in the figure) and a liquid outlet (not shown in the figure), and the number of bending sections 312 is 2N+1, and the liquid inlet and the liquid outlet are respectively arranged on the same side of the heat exchange flat tube 31 along the first direction X, wherein N is a positive integer greater than or equal to 1.

[0082] Specifically, the liquid inlet and the liquid outlet can be respectively arranged on the same side of the heat exchange flat tube 31 along the first direction X, which can reduce the space occupied by the connecting pipeline along the first direction X compared with arranging the liquid inlet and the liquid outlet on both sides of the heat exchange flat tube 31 along the first direction X. Optionally, the number of bending sections 312 is 3. The liquid inlet and the liquid outlet are respectively arranged on the same side of the heat exchange flat tube 31 along the first direction X.

[0083] By setting the number of the bending segments 312 as 2N+1, i.e. setting the number of the bending segments 312 as an odd number, and connecting each of the two ends of any bending segment 312 with an extension segment 311, the extension segments 311 at the two ends are respectively provided with the liquid inlet and the liquid outlet, thus the liquid inlet and the liquid outlet are respectively arranged on the same side of the heat exchange flat tube 31 along the first direction X, and the pipeline respectively communicating with the liquid inlet and the liquid outlet is arranged on the same side of the heat exchange flat tube 31, which facilitates the input and output of the heat exchange medium into the heat exchange flat tube 31.

[0084] In combination with FIGS. 2, 5-7, in some embodiments of the present application, the bending segments 312 include at least a first bending segment 3121, a second bending segment 3122 and a third bending segment 3123, and the extension segments 311 include at least a first extension segment 3111, a second extension segment 3112, a third extension segment 3113 and a fourth extension segment 3114, wherein the first extension segment 3111, the fourth extension segment 3114, the third extension segment 3113 and the second extension segment 3112 are sequentially arranged, the first extension segment 3111 and the second extension segment 3112 are connected in communication through the first bending segment 3121, the second extension segment 3112 and the third extension segment 3113 are connected in communication through the second bending segment 3122, and the third extension segment 3113 and the fourth extension segment 3114 are connected in communication through the second bending segment 3122.

[0085] Specifically, the first extension segment 3111, the first bending segment 3121, the second extension segment 3112, the second bending segment 3122, the third extension segment 3113, the third bending segment 3123 and the fourth extension segment 3114 are sequentially connected to form the heat exchange flat tube 31 and form a continuous heat exchange channel in the heat exchange flat tube 31. The first extension segment 3111 is provided with the liquid inlet, and the fourth extension segment 3114 is provided with the liquid outlet. The first extension segment 3111, the second extension segment 3112, the third extension segment 3113 and the fourth extension segment 3114 are sequentially arranged. The first extension segment 3111 and the second extension segment 3112 are respectively arranged at the outermost side of the heat exchange flat tube 31, the third extension segment 3113 and the fourth extension segment 3114 are arranged between the first extension segment 3111 and the second extension segment 3112, the third extension segment 3113 is arranged on the side close to the second extension segment 3112, and the fourth extension segment 3114 is arranged on the side close to the first extension segment 3111. The direction of the black straight arrow in FIG. 7 is the flow direction of the heat exchange medium in the heat exchange flat tube 31.

[0086] The same battery cell 21 is heat-exchanged by the first extension section 3111, the second extension section 3112, the third extension section 3113 and the fourth extension section 3114, so as to improve the heat exchange area and heat exchange efficiency of the heat exchange finned tube 31 and the battery cell 21. Since the first extension section 3111, the second extension section 3112, the third extension section 3113 and the fourth extension section 3114 are sequentially communicated through three bending sections, the first extension section 3111 and the fourth extension section 3114 have the maximum temperature difference. By arranging the first extension section 3111, the fourth extension section 3114, the third extension section 3113 and the second extension section 3112 in sequence, the heat exchange between the heat exchange finned tube 31 and the battery cell 21 is more uniform, so as to improve the temperature consistency of different positions of the battery cell 20.

[0087] In combination with FIGS. 2 and 8, in some embodiments of the present application, the heat exchange finned tube 31 includes an inlet and an outlet, and the number of the bending sections 312 is 2N, and the inlet and the outlet are respectively arranged on two sides of the heat exchange finned tube 31 along the first direction X, where N is a positive integer greater than or equal to 1.

[0088] Specifically, the inlet and the outlet can be respectively arranged on two sides of the heat exchange finned tube 31 along the first direction X. Compared with arranging the inlet and the outlet on the same side of the heat exchange finned tube 31 along the first direction X, it is convenient to connect the pipelines to the inlet and the outlet respectively. Optionally, the number of the bending sections 312 is two. The inlet and the outlet are respectively arranged on two sides of the heat exchange finned tube 31 along the first direction X.

[0089] By setting the number of the bending sections 312 as 2N, i.e., setting the number of the bending sections 312 as an even number, and one extension section 311 is connected to each end of any bending section 312, so that the extension sections 311 at the two ends are respectively provided with the inlet and the outlet. Therefore, the inlet and the outlet are respectively arranged on two sides of the heat exchange finned tube 31 along the first direction X, so as to facilitate arranging the pipelines respectively communicating with the inlet and the outlet on two sides of the heat exchange finned tube 31, and facilitating inputting and outputting the heat exchange medium into and out of the heat exchange finned tube 31.

[0090] In combination with FIGS. 2, 5 to 7, in some embodiments of the present application, the heat exchange assembly 30 includes a plurality of heat exchange finned tubes 31, and the plurality of heat exchange finned tubes 31 are arranged at intervals along a second direction Y, and the second direction Y intersects the first direction X.

[0091] Specifically, the plurality of heat exchange finned tubes 31 can be respectively arranged on two sides of the same battery cell 20 along the second direction Y, or the battery pack 10 includes a plurality of battery cells 20, and at least a part of the battery cells 20 are provided with the heat exchange finned tube 31 on at least one side along the second direction Y, and can exchange heat with the heat exchange finned tube 31.

[0092] By arranging multiple heat exchange flat tubes 31, the multiple heat exchange flat tubes 31 can exchange heat with the battery cells 20 respectively, thereby improving the heat exchange efficiency of the heat exchange assembly 30.

[0093] In combination with FIGS. 5-7, in some embodiments of the present application, the heat exchange assembly 30 further comprises a liquid inlet header 32 and a liquid outlet header 33, the heat exchange flat tubes 31 comprise liquid inlets and liquid outlets, the liquid inlets of any heat exchange flat tube 31 are respectively connected in communication with the liquid inlet header 32, and the liquid outlets of any heat exchange flat tube 31 are respectively connected in communication with the liquid outlet header 33.

[0094] Specifically, the interiors of the liquid inlet header 32 and the liquid outlet header 33 are respectively through structures. By connecting the liquid inlets of any heat exchange flat tube 31 in communication with the liquid inlet header 32, the heat exchange medium can be respectively input to the multiple heat exchange flat tubes 31 through the liquid inlet header 32, by connecting the liquid outlets of any heat exchange flat tube 31 in communication with the liquid outlet header 33, the heat exchange medium of the multiple heat exchange flat tubes 31 can be output through the liquid outlet header 33, thereby improving the flowability of the heat exchange medium in the heat exchange flat tubes 31.

[0095] In combination with FIGS. 5, 6, 7, and 9, in some embodiments of the present application, along the first direction X, the liquid inlet header 32 and the liquid outlet header 33 are respectively arranged on the same side of the heat exchange flat tubes 31, and the liquid inlet header 32 and the liquid outlet header 33 are arranged in abutment or spaced apart along the third direction Z, which is perpendicular to the first direction X and the second direction Y.

[0096] Specifically, the liquid inlet header 32 and the liquid outlet header 33 can be respectively arranged on the same side of the heat exchange flat tubes 31 along the first direction X. Compared with arranging the liquid inlet header 32 and the liquid outlet header 33 on both sides of the heat exchange flat tubes 31 along the first direction X, the space occupied by the liquid inlet header 32 and the liquid outlet header 33 along the first direction X can be reduced.

[0097] Since the liquid inlet header 32 and the liquid outlet header 33 are arranged on the same side of the heat exchange flat tubes 31 along the first direction X, in order to reduce the mutual shielding of the liquid inlet header 32 and the liquid outlet header 33 along the first direction X, the liquid inlet header 32 and the liquid outlet header 33 are arranged in abutment or spaced apart along the third direction Z, so as to connect the liquid inlets in communication with the liquid inlet header 32 and connect the liquid outlets in communication with the liquid outlet header 33.

[0098] In combination with FIGS. 7, 10, and 11, in some embodiments of the present application, the heat exchange assembly 30 further comprises a liquid inlet connector 34 and a liquid outlet connector 35, the liquid inlet connector 34 is connected in communication with the liquid inlet header 32, and the liquid outlet connector 35 is connected in communication with the liquid outlet header 33, wherein,

[0099] The liquid inlet connector 34 is arranged at one end of the liquid inlet header pipe 32 along the second direction Y, and the liquid outlet connector 35 is arranged at an end of the liquid outlet header pipe 33 away from the liquid inlet connector 34 along the second direction Y;

[0100] Alternatively, the liquid inlet connector 34 is arranged at one end of the liquid inlet header pipe 32 along the second direction Y, and the liquid outlet connector 35 is arranged at an end of the liquid outlet header pipe 33 close to the liquid inlet connector 34 along the second direction Y.

[0101] Alternatively, the liquid inlet connector 34 is arranged at one end of the liquid inlet header pipe 32 along the second direction Y, and the liquid outlet connector 35 is arranged at an end of the liquid outlet header pipe 33 close to the liquid inlet connector 34 along the second direction Y.

[0102] Specifically, the liquid inlet header pipe 32 can be connected to an external liquid supply pipeline through the liquid inlet connector 34, and the liquid outlet header pipe 33 can be connected to an external liquid return pipeline through the liquid outlet connector 35, thereby improving the flowability of the heat exchange medium in the heat exchange flat tube 31. The liquid inlet connector 34 and the liquid outlet connector 35 can be arranged at reasonable positions according to the arrangement positions of the external liquid supply pipeline and the external liquid return pipeline, or the installation position of the battery pack 10, thereby facilitating the connection of the liquid inlet connector 34 and the liquid outlet connector 35 to the external pipelines.

[0103] As shown in FIG. 7, the liquid inlet connector 34 is arranged at one end of the liquid inlet header pipe 32 along the second direction Y, and the liquid outlet connector 35 is arranged at an end of the liquid outlet header pipe 33 away from the liquid inlet connector 34 along the second direction Y. Alternatively, as shown in FIG. 9, the liquid inlet connector 34 is arranged at one end of the liquid inlet header pipe 32 along the second direction Y, and the liquid outlet connector 35 is arranged at an end of the liquid outlet header pipe 33 close to the liquid inlet connector 34 along the second direction Y. Alternatively, as shown in FIG. 10, the liquid inlet connector 34 is arranged at a middle position of the liquid inlet header pipe 32 along the second direction Y, and the liquid outlet connector 35 is arranged at a middle position of the liquid outlet header pipe 33 along the second direction Y. The middle position of the liquid inlet header pipe 32 refers to a position arranged between the two end portions of the liquid inlet header pipe 32 along the second direction Y, and the interval between each of the two end portions of the liquid inlet header pipe 32 and the middle position is substantially equal. The middle position of the liquid outlet header pipe 33 refers to a position arranged between the two end portions of the liquid outlet header pipe 33 along the second direction Y, and the interval between each of the two end portions of the liquid outlet header pipe 33 and the middle position is substantially equal.

[0104] In some embodiments of the present application, the liquid inlet connector 34 can be welded to the liquid inlet header pipe 32, and the liquid inlet header pipe 32 can be welded to the liquid inlet port of the heat exchange flat tube 31, thereby improving the connection strength between the liquid inlet connector 34, the liquid inlet header pipe 32 and the heat exchange flat tube 31, and reducing the occurrence of water leakage.

[0105] In some embodiments of the present application, the liquid outlet joint 35 can be welded with the liquid outlet header 33, and the liquid outlet header 33 can be welded with the liquid outlet of the heat exchange finned tube 31, so as to improve the connection strength between the liquid outlet joint 35, the liquid outlet header 33 and the heat exchange finned tube 31, and reduce the occurrence of water leakage.

[0106] The liquid inlet header 32 can be connected with the external liquid supply pipeline through the liquid inlet joint 34, and the liquid outlet header 33 can be connected with the external liquid return pipeline through the liquid outlet joint 35, so as to improve the flowability of the heat exchange medium in the heat exchange finned tube 31. The liquid inlet joint 34 and the liquid outlet joint 35 can be reasonably arranged according to the arrangement position of the external liquid supply pipeline and the external liquid return pipeline, or the mounting position of the battery pack 10, so as to facilitate the connection of the liquid inlet joint 34 and the liquid outlet joint 35 with the external pipeline.

[0107] In combination with FIGS. 2, 5 and 12, in some embodiments of the present application, the battery pack 10 includes a plurality of battery units 20 arranged along the second direction Y, and the battery pack 10 further includes a plurality of heat exchange finned tubes 31 arranged along the second direction Y; wherein at least one side surface of the battery unit 20 and all the extension sections 311 of at least one heat exchange finned tube 31 are respectively heat exchanged along the second direction Y, a plurality of extension sections 311 in the same heat exchange finned tube 31 are arranged along the third direction Z, and / or at least one side surface of the battery unit 20 and all the extension sections 311 of at least one heat exchange finned tube 31 are respectively heat exchanged along the third direction Z, a plurality of extension sections 311 in the same heat exchange finned tube 31 are arranged along the second direction Y, wherein the second direction Y intersects the first direction X, and the third direction Z is perpendicular to the first direction X and the second direction Y, respectively.

[0108] In combination with FIGS. 12 and 13, in some embodiments of the present application, the battery pack 10 includes a plurality of battery units 20 arranged along the second direction Y, and the battery pack 10 further includes a plurality of heat exchange finned tubes 31 arranged along the second direction Y. A plurality of extension sections 311 of the same heat exchange finned tube 31 are arranged along the third direction Z, respectively, and are arranged on at least one side surface of the battery unit 20 along the second direction Y, so as to be heat exchanged with the battery unit 20 along the second direction Y.

[0109] Since a plurality of battery monomers 21 in the battery unit 20 are arranged along the first direction X, at least one side surface of the battery unit 20 and all the extension sections 311 of at least one heat exchange finned tube 31 are respectively heat exchanged along the second direction Y, so as to heat exchange all the battery monomers 21 in the battery unit 20 through the heat exchange finned tube 31, thereby improving the heat exchange efficiency of the battery unit 20.

[0110] In combination with FIG. 2 and FIG. 5, in some embodiments of the present application, the battery pack 10 comprises a plurality of battery units 20 arranged along the second direction Y, and the battery pack 10 further comprises a plurality of heat exchange flat tubes 31 arranged along the second direction Y. The plurality of extension sections 311 of the same heat exchange flat tube 31 are arranged along the second direction Y respectively, and are arranged on at least one side surface of the battery unit 20 along the third direction Z, so as to exchange heat with the battery unit 20 along the third direction Z.

[0111] Since the plurality of battery cells 21 in the battery unit 20 are arranged along the first direction X, the at least one side surface of the battery unit 20 along the third direction Z exchanges heat with all the extension sections 311 of the at least one heat exchange flat tube 31 respectively, so as to exchange heat with all the battery cells 21 in the battery unit 20 through the heat exchange flat tube 31, thereby improving the heat exchange efficiency of the battery unit 20.

[0112] In combination with FIG. 5 and FIG. 6, in some embodiments of the present application, the bending radius of the bending section 312 is R, and the size of the extension section 311 along the arrangement direction of the plurality of extension sections 311 is L1, wherein the ratio of R to L1 is 1.5-5.5.

[0113] Taking the first bending section 3121 as an example, the first bending section 3121 comprises an inner circular arc section and an outer circular arc section, and the bending radius refers to the radius of the intermediate circular arc section arranged between the inner circular arc section and the outer circular arc section along the radial direction of the first bending section 3121, and the intermediate circular arc section is equal in size to the interval between the inner circular arc section and the outer circular arc section along the radial direction of the first bending section 3121. The ratio of R to L1 can be any value between 1.5…2.0…2.5…3.0…4.0…5.5.

[0114] By setting the ratio of R to L1 to be 1.5-5.5, the bending radius of the bending section 312 can be reduced, so that the interval between adjacent extension sections 311 along the arrangement direction of the plurality of extension sections 311 can be reduced, and thus a larger number of extension sections 311 can be arranged along the arrangement direction of the plurality of extension sections 311, thereby improving the heat exchange area and heat exchange efficiency between the heat exchange flat tube 31 and the battery cell 21.

[0115] In combination with FIG. 5 and FIG. 6, in some embodiments of the present application, the value of L1 is 10mm-100mm.

[0116] Specifically, the value of L1 can be any value between 10mm…20mm…40mm…60mm..80mm…100mm. Those skilled in the art should understand that the larger the size of L1 of the extension section 311, the larger the required bending radius size, thereby increasing the spacing size between the two adjacent extension sections 311. Compared with the heat exchange flat tube in the prior art, the extension section 311 with the above L1 size can reduce the size L1 of the extension section 311, thereby facilitating the bending of the heat exchange flat tube 31 on the basis of a smaller bending radius, thereby increasing the number of extension sections 311 for heat exchange with the battery unit 20, and improving the heat exchange area and heat exchange efficiency between the heat exchange flat tube 31 and the battery unit 20.

[0117] According to the above size setting, the size L1 of the extension section can be reduced, thereby facilitating the bending of the heat exchange flat tube 31 on the basis of a smaller bending radius, thereby increasing the number of extension sections 311 for heat exchange with the battery unit 20, and improving the heat exchange area and heat exchange efficiency between the heat exchange flat tube 31 and the battery unit 20.

[0118] In combination with FIGS. 5 and 6, in some embodiments of the present application, the size of the battery unit 20 along the arrangement direction of the plurality of extension sections 311 is L2, wherein the ratio of L2 to L1 ranges from 5.5 to 10.

[0119] In some embodiments of the present application, the plurality of extension sections 311 are arranged along the second direction Y, the size of the battery unit 20 along the second direction Y is L2, and the ratio of L2 to L1 ranges from 5.5 to 10. The ratio of L2 to L1 can be any value between 5.5…6.0…6.5…7.0…8.0…10. Optionally, the value of L1 ranges from 10mm to 100mm, and the value of L2 ranges from 55mm to 1000mm.

[0120] Since the ratio of L2 to L1 is set to range from 5.5 to 10, the plurality of extension sections 311 can be arranged for heat exchange with the same battery unit 20 along the arrangement direction of the plurality of extension sections 311, thereby improving the heat exchange area and heat exchange efficiency between the heat exchange flat tube 31 and the battery unit 20.

[0121] In combination with FIGS. 2, 5 and 12, the battery 10 further includes a box body 40, which includes a box main body 41 and a support plate 42 connected to each other and forming a mounting cavity therebetween, and the plurality of battery units 20 are arranged in the mounting cavity and arranged along the second direction Y.

[0122] Specifically, the box body 40 includes a box body 41 and a support plate 42. The box body 41 is a hollow structure with an open bottom. The support plate 42 is a substantially plate-shaped structure. The support plate 42 is combined with the open side of the box body 41 to jointly define an installation cavity for accommodating the battery monomer 21. Alternatively, the box body 41 and the support plate 42 can both be hollow structures with an open side. The open side of the box body 41 is combined with the open side of the support plate 42 to jointly define an installation cavity for accommodating the battery unit 20.

[0123] In some embodiments of the present application, the heat exchange flat tube 31 can be arranged on the surface of the support plate 42 facing the battery unit 20 along the third direction Z and welded or bonded to the support plate 42 by a heat-conducting adhesive.

[0124] In some embodiments of the present application, the heat exchange flat tube 31 is arranged on the surface of the support plate 42 away from the battery unit 20 along the third direction Z and welded or bonded to the support plate 42 by a heat-conducting adhesive. Thus, the heat exchange flat tube 31 can exchange heat with the battery unit 20 through the support plate 42.

[0125] In some embodiments of the present application, the heat exchange flat tube 31 is arranged between two adjacent rows of battery monomers 21 along the second direction Y and bonded to the side surface of the battery unit 20 or bonded by a heat-conducting adhesive.

[0126] In some embodiments of the present application, the heat exchange flat tube 31 is arranged between the battery unit 20 and the side wall of the box body 41 along the second direction Y and welded or bonded to the box body 41 by a heat-conducting adhesive.

[0127] Any of the above arrangement modes can exchange heat between the heat exchange flat tube 31 and the battery monomer 21, thereby adjusting the temperature of the battery monomer 21.

[0128] As shown in FIG. 1, the second aspect of the present application provides a power consumption device. The power consumption device includes any of the above battery packs 10. The battery pack 10 is configured to provide electric energy.

[0129] The power consumption device of the present application has the same technical features as the battery pack 10 of any of the above embodiments and can achieve the same technical effects. Therefore, no further description is provided herein.

[0130] As shown in FIG. 1, in some embodiments of the present application, the power consumption device can be a vehicle 1. The vehicle 1 includes any of the above battery packs 10. The battery pack 10 is configured to provide electric energy for the vehicle 1 and drive the vehicle 1 to move.

[0131] As shown in FIG. 14, the third aspect of the present application provides an energy storage device. The energy storage device includes any of the above battery packs 10. The battery pack 10 is configured to provide electric energy.

[0132] Since the energy storage device in the present application has the same technical features as the battery pack 10 of any of the above embodiments, the same technical effects can be achieved, and here will not be described in detail.

[0133] As shown in FIG. 14, in some embodiments of the present application, the energy storage device can be an energy storage container 2, which comprises a cabinet 201 and the battery pack 10 of any of the above embodiments, the battery pack 10 is arranged in the cabinet 201 and used to provide electric energy for the energy storage container 2.

[0134] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, features and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described.

[0135] As shown in FIG. 1, in some embodiments of the present application, a vehicle 1 comprises a battery pack 10, which is used to provide electric energy for the vehicle 1 and drive the vehicle 1 to walk.

[0136] As shown in FIGS. 2, 5 and 6, the battery pack 10 comprises a box body 40, a battery unit 20 and a heat exchange assembly 30, the box body 40 forms an installation cavity, and the battery unit 20 is arranged in the installation cavity.

[0137] As shown in FIGS. 2, 5 and 6, the battery pack 10 comprises a plurality of battery units 20 arranged along a second direction Y, any one of the battery units 20 comprises a plurality of battery monomers 21 arranged in layers along a first direction X, the heat exchange assembly 30 comprises a plurality of heat exchange flat tubes 31, the plurality of heat exchange flat tubes 31 are arranged in intervals along the second direction Y, and at least one heat exchange flat tube 31 is arranged corresponding to the surface of any one column of battery units 20 along a third direction Z. The heat exchange flat tube 31 comprises a plurality of bending sections 312 and a plurality of extension sections 311, the extension sections 311 and the bending sections 312 are arranged alternately and communicated in sequence, both ends of any one of the bending sections 312 are respectively provided with one of the extension sections 311, the plurality of extension sections 311 are arranged along the arrangement direction of the plurality of extension sections 311, and any one of the battery monomers 21 in the same battery unit 20 exchanges heat with all the extension sections 311 in the same heat exchange flat tube 31. Wherein, the bending radius of the bending section 312 is R, the size of the extension section 311 along the arrangement direction of the plurality of extension sections 311 is L1, the size of the battery monomer 21 is L2, the value range of L1 is 10mm-100mm, the ratio of R to L1 is 1.5-5.5, and the ratio range of L2 to L1 is 5.5-10.

[0138] As shown in FIGS. 5 and 6, the heat exchange flat tube 31 comprises a first bending section 3121, a second bending section 3122, and a third bending section 3123, and a first extending section 3111, a second extending section 3112, a third extending section 3113, and a fourth extending section 3114. The first extending section 3111, the first bending section 3121, the second extending section 3112, the second bending section 3122, the third extending section 3113, the third bending section 3123, and the fourth extending section 3114 are sequentially communicated, and the first extending section 3111, the fourth extending section 3114, the third extending section 3113, and the second extending section 3112 are arranged along the second direction Y. Any one of the battery cells 21 in the same battery unit 20 is respectively fitted with the first extending section 3111, the second extending section 3112, the third extending section 3113, and the fourth extending section 3114 in the same heat exchange flat tube 31.

[0139] As shown in FIGS. 5, 6, and 9, the heat exchange assembly 30 further comprises a liquid inlet header 32 and a liquid outlet header 33, the liquid inlet header 32 and the liquid outlet header 33 are respectively arranged on the same side of the heat exchange flat tube 31 along the first direction X, and the liquid inlet header 32 and the liquid outlet header 33 are fitted along the third direction Z. The heat exchange flat tube 31 comprises a liquid inlet and a liquid outlet, the liquid inlet of any one of the heat exchange flat tubes 31 is respectively communicated with the liquid inlet header 32, and the liquid outlet of any one of the heat exchange flat tubes 31 is respectively communicated with the liquid outlet header 33. The heat exchange assembly 30 further comprises a liquid inlet connector 34 and a liquid outlet connector 35, the liquid inlet connector 34 is communicated with the liquid inlet header 32, and the liquid outlet connector 35 is communicated with the liquid outlet header 33, the liquid inlet connector 34 is arranged at one end of the liquid inlet header 32 along the second direction Y, and the liquid outlet connector 35 is arranged at the end of the liquid outlet header 33 away from the liquid inlet connector 34 along the second direction Y.

[0140] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery pack, wherein, The application relates to a battery unit and a heat exchange assembly. The battery unit comprises a plurality of battery cells arranged in a stack along a first direction. The heat exchange assembly comprises at least one heat exchange flat tube, which comprises a plurality of bending sections and a plurality of extension sections arranged alternately and in communication with the bending sections, and two ends of any one of the bending sections are respectively provided with one of the extension sections, and the plurality of extension sections are arranged along a direction intersecting the first direction.

2. The battery pack of claim 1, wherein, The heat exchange flat tube comprises an inlet and an outlet, and the number of the bending sections is 2N+1, and the inlet and the outlet are arranged on the same side of the heat exchange flat tube along the first direction, wherein N is a positive integer greater than or equal to 1.

3. The battery pack according to claim 1 or 2, wherein The bending sections comprise at least a first bending section, a second bending section and a third bending section, and the extension sections comprise at least a first extension section, a second extension section, a third extension section and a fourth extension section, wherein the first extension section, the fourth extension section, the third extension section and the second extension section are arranged in sequence, the first extension section and the second extension section are connected in communication through the first bending section, the second extension section and the third extension section are connected in communication through the second bending section, and the third extension section and the fourth extension section are connected in communication through the third bending section.

4. The battery pack according to any one of claims 1 to 3, wherein, The heat exchange flat tube comprises an inlet and an outlet, and the number of the bending sections is 2N, and the inlet and the outlet are arranged on the two sides of the heat exchange flat tube along the first direction, wherein N is a positive integer greater than or equal to 1.

5. The battery pack according to any one of claims 1 to 4, wherein, The heat exchange assembly comprises a plurality of heat exchange flat tubes, and the plurality of heat exchange flat tubes are arranged at intervals along a second direction intersecting the first direction.

6. The battery pack of claim 5, wherein, The heat exchange assembly further comprises an inlet liquid collecting pipe and an outlet liquid collecting pipe, the heat exchange flat tube comprises an inlet and an outlet, the inlet of any one of the heat exchange flat tubes is connected in communication with the inlet liquid collecting pipe, and the outlet of any one of the heat exchange flat tubes is connected in communication with the outlet liquid collecting pipe.

7. The battery pack of claim 6, wherein, Along the first direction, the inlet liquid collecting pipe and the outlet liquid collecting pipe are arranged on the same side of the heat exchange flat tube, and the inlet liquid collecting pipe and the outlet liquid collecting pipe are arranged in abutment or at intervals along a third direction perpendicular to the first direction and the second direction.

8. The battery pack of claim 6, wherein, The heat exchange assembly further comprises an inlet joint and an outlet joint, the inlet joint is connected in communication with the inlet liquid collecting pipe, and the outlet joint is connected in communication with the outlet liquid collecting pipe, wherein The inlet joint is arranged at one end of the inlet liquid collecting pipe along the second direction, and the outlet joint is arranged at an end of the outlet liquid collecting pipe away from the inlet joint along the second direction; Or, the inlet joint is arranged at one end of the inlet liquid collecting pipe along the second direction, and the outlet joint is arranged at an end of the outlet liquid collecting pipe close to the inlet joint along the second direction; Or, the inlet joint is arranged at a middle position of the inlet liquid collecting pipe along the second direction, and the outlet joint is arranged at a middle position of the outlet liquid collecting pipe along the second direction.

9. The battery pack according to any one of claims 1 to 8, wherein, The battery pack comprises a plurality of battery units arranged along a second direction, and a plurality of heat exchange flat tubes arranged along the second direction; wherein at least one side surface of the battery unit and all the extension sections of at least one heat exchange flat tube are in heat exchange with each other along the second direction, a plurality of extension sections in the same heat exchange flat tube are arranged along a third direction, and / or at least one side surface of the battery unit and all the extension sections of at least one heat exchange flat tube are in heat exchange with each other along the third direction, a plurality of extension sections in the same heat exchange flat tube are arranged along the second direction, wherein the second direction intersects the first direction, and the third direction is perpendicular to the first direction and the second direction respectively.

10. The battery pack according to any one of claims 1 to 9, wherein, The bending radius of the bending section is R, and the size of the extension section along the arrangement direction of the plurality of extension sections is L1, wherein the ratio of R to L1 is 1.5-5.

5.

11. The battery pack of claim 10, wherein, The value range of L1 is 10-100 mm.

12. The battery pack of claim 10, wherein, The size of the battery unit along the arrangement direction of the plurality of extension sections is L2, wherein the ratio of L2 to L1 is 5.5-10.

13. An electrical device, comprising: The power utilization device comprises the battery pack of any one of claims 1-12, and the battery pack is used to provide electric energy.

14. An energy storage device, wherein, The energy storage device comprises the battery pack of any one of claims 1-12, and the battery pack is used to provide electric energy.

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