Battery pack, electrical device, and energy storage apparatus

Abstract

The present application relates to the technical field of batteries, and relates in particular to a battery pack, an electrical device, and an energy storage apparatus. The battery pack of the present application comprises a battery unit and a heat exchange assembly. The battery unit comprises a plurality of battery cells stacked in a first direction. The heat exchange assembly comprises at least one heat exchange unit. The heat exchange unit comprises a first heat exchange tube, a communication tube, and a second heat exchange tube, which are sequentially connected. The heat exchange unit is used for circulating a heat exchange medium. The flow directions of the heat exchange medium in the first heat exchange tube and in the second heat exchange tube are opposite to each other. The communication tube is provided separately from and connected to the first heat exchange tube and the second heat exchange tube. The battery unit separately exchanges heat with the first heat exchange tube and the second heat exchange tube of the at least one heat exchange unit. According to the battery pack of the present application, a heat exchange area between the heat exchange unit and the battery unit can be increased, thereby improving the heat exchange efficiency between the heat exchange unit 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. 202411045475.2, 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, 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 size 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 in 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 flat tube heat exchange efficiency.

[0007] The first aspect of the present application provides a battery pack, comprising:

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

[0009] a heat exchange assembly, the heat exchange assembly comprising at least one heat exchange unit, the heat exchange unit comprising a first heat exchange tube, a communication tube and a second heat exchange tube connected in sequence, the heat exchange unit being used to circulate a heat exchange medium, the flow direction of the heat exchange medium in the first heat exchange tube and the second heat exchange tube being opposite, the communication tube being separately provided and connected with the first heat exchange tube and the second heat exchange tube, and the battery cell being in heat exchange with the first heat exchange tube and the second heat exchange tube of the at least one heat exchange unit, respectively.

[0010] According to the battery pack of the present application, by using separate arrangement and connection of the first heat exchange tube, the communication tube and the second heat exchange tube, compared with the arrangement of the bending section between the adjacent heat exchange tube sections, the spacing size of the first heat exchange tube and the second heat exchange tube can be adjusted, such as being reduced, thereby increasing the size of the first heat exchange tube and / or the second heat exchange tube along the arrangement direction of the first heat exchange tube and the second heat exchange tube, and further increasing the heat exchange area of the heat exchange unit and the battery cell, and improving the heat exchange efficiency of the heat exchange unit and the battery cell.

[0011] In some embodiments of the present application, the communication pipe is arranged at one end of the heat exchange unit along the first direction, and the first heat exchange pipe and the second heat exchange pipe are respectively inserted into the communication pipe along the first direction and welded with the communication pipe.

[0012] The first heat exchange pipe and the second heat exchange pipe are respectively inserted into the communication pipe along the first direction, so that the first heat exchange pipe and the second heat exchange pipe can respectively exchange heat with the plurality of battery cells arranged in the first direction, thereby improving the heat exchange efficiency of the heat exchange unit and the battery unit. At the same time, the first heat exchange pipe and the second heat exchange pipe arranged separately can be connected with the communication pipe into the heat exchange unit by welding, and the sealing performance of the connection between the first heat exchange pipe and the communication pipe and the connection between the second heat exchange pipe and the communication pipe is improved.

[0013] In some embodiments of the present application, the communication pipe is arranged beyond the end of the battery unit along the first direction.

[0014] By arranging the communication pipe beyond the end of the battery unit along the first direction, the battery unit can only exchange heat with the first heat exchange pipe and the second heat exchange pipe, and since the flow directions of the heat exchange medium in the first heat exchange pipe and the heat exchange medium in the second heat exchange pipe are opposite, the temperature consistency of the battery unit is improved.

[0015] In some embodiments of the present application, the plurality of battery cells in the battery unit respectively exchange heat with the first heat exchange pipe and the second heat exchange pipe in the heat exchange unit, and the plurality of battery cells respectively have equal heat exchange areas with the heat exchange unit.

[0016] Since the plurality of battery cells respectively have equal heat exchange areas with the heat exchange unit, the temperature consistency of the plurality of battery cells in the battery unit is improved.

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

[0018] By arranging the plurality of heat exchange units, the plurality of heat exchange units can respectively exchange heat with the battery unit, 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 an inlet liquid collecting pipe and an outlet liquid collecting pipe, the inlet liquid collecting pipe and the outlet liquid collecting pipe are respectively arranged at one end of the heat exchange unit away from the communication pipe along the first direction, one end of the first heat exchange pipe away from the communication pipe is provided with an inlet, one end of the second heat exchange pipe away from the communication pipe is provided with an outlet, the inlet of any heat exchange unit is respectively communicated with the inlet liquid collecting pipe, and the outlet of any heat exchange unit is respectively communicated with the outlet liquid collecting pipe.

[0020] The inlet of each heat exchange unit is connected to the inlet header, so that the heat exchange medium is input to the plurality of heat exchange units through the inlet header; the outlet of each heat exchange unit is connected to the outlet header, so that the heat exchange medium of the plurality of heat exchange units is output through the outlet header, thereby improving the flowability of the heat exchange medium in the heat exchange unit.

[0021] In some embodiments of the present application, the inlet header and the outlet header are arranged in abutment or spaced apart along a third direction, and the third direction is perpendicular to the first direction and the second direction.

[0022] Since the inlet header and the outlet header are arranged on the same side of the heat exchange flat tube along the first direction, in order to reduce the mutual shielding of the inlet header and the outlet header along the first direction, the inlet header and the outlet header are arranged in abutment or spaced apart along the third direction, so as to connect the inlet to the inlet header and connect the outlet to the outlet header.

[0023] In some embodiments of the present application, the communication pipes of the plurality of heat exchange units are connected in sequence and form a communication main pipe, and the communication pipes of the plurality of heat exchange units are not connected to each other.

[0024] A plurality of communication pipes are formed in a communication main pipe, which facilitates the overall assembly of the plurality of communication pipes, and the plurality of communication pipes are arranged in isolation and are not connected to each other, thereby forming a plurality of heat exchange units for heat exchange with the battery cells.

[0025] In some embodiments of the present application, the communication pipes of any two adjacent heat exchange units are arranged in spaced apart.

[0026] By arranging the plurality of communication pipes in spaced apart, the plurality of communication pipes are arranged respectively, and the plurality of heat exchange units are formed by the plurality of communication pipes, so that the plurality of heat exchange units can be used for heat exchange with the battery cells respectively.

[0027] In some embodiments of the present application, the battery cells are provided with heat exchange units on at least one side along the second direction, and the first heat exchange pipe and the second heat exchange pipe are arranged in spaced apart along the third direction; or the battery cells are provided with heat exchange units on at least one side along the third direction, and the first heat exchange pipe and the second heat exchange pipe are arranged in spaced apart along the second direction, wherein the first direction intersects the second direction, and the third direction is perpendicular to the first direction and the second direction.

[0028] The battery unit is provided with the heat exchange unit on at least one side of the battery unit along the second direction, and the heat exchange unit can exchange heat with all the battery monomers in the battery unit respectively, thereby improving the heat exchange efficiency of the battery unit.

[0029] In some embodiments of the present application, the size of the first heat exchange pipe is L1, the size of the second heat exchange pipe is L2, and the size of the battery unit is L3 along the arrangement direction of the first heat exchange pipe and the second heat exchange pipe, wherein L1+L2≤L3.

[0030] By setting L1+L2≤L3, the battery unit can be simultaneously connected to the first heat exchange pipe and the second heat exchange pipe in the same heat exchange unit for heat exchange, thereby improving the heat exchange efficiency of the heat exchange unit and the battery unit. At the same time, the flow directions of the heat exchange medium in the first heat exchange pipe and the second heat exchange pipe are opposite, so that the temperature consistency of the battery unit can be improved.

[0031] In some embodiments of the present application, 2≤L3 / L1≤5, and / or 2≤L3 / L2≤5.

[0032] By setting 2≤L3 / L1≤5, the heat exchange area and the heat exchange efficiency of the first heat exchange pipe and the battery unit can be improved without occupying too much heat exchange area of the second heat exchange pipe. By setting 2≤L3 / L2≤5, the heat exchange area and the heat exchange efficiency of the second heat exchange pipe and the battery unit can be improved without occupying too much heat exchange area of the first heat exchange pipe.

[0033] In some embodiments of the present application, the value range of L1 is 10mm-500mm, and / or the value range of L2 is 10mm-500mm, and / or the value range of L3 is 20mm-1000mm.

[0034] By setting the value range of L1 to be 10mm-500mm, the heat exchange area and the heat exchange efficiency of the first heat exchange pipe and the battery unit can be improved. By setting the value range of L2 to be 10mm-500mm, the heat exchange area and the heat exchange efficiency of the second heat exchange pipe and the battery unit can be improved. By setting the value range of L3 to be 20mm-1000mm, the battery unit can be simultaneously connected to the first heat exchange pipe and the second heat exchange pipe for heat exchange.

[0035] In some embodiments of the present application, the battery pack further comprises a box body and a support plate connected to the box body and forming an installation cavity for accommodating the battery cells between the box body and the support plate, wherein the support plate is formed with an installation groove facing away from the battery cells, and the battery cells are arranged in the installation groove, and the heat exchange unit is arranged on the outer surface of the installation groove facing away from the battery cells.

[0036] By arranging the battery cells in the installation groove and arranging the heat exchange unit on the outer surface of the installation groove facing away from the battery cells, the heat exchange unit can exchange heat with the battery cells through the support plate, thereby adjusting the temperature of the battery cells.

[0037] In some embodiments of the present application, the edge of the installation groove is formed with a support portion, the support portion forms a stepped portion with the bottom surface of the installation groove, and at least part of the liquid inlet collecting pipe and / or at least part of the liquid outlet collecting pipe are arranged in the stepped portion.

[0038] In the arrangement direction of the battery cells, the support plate and the heat exchange assembly, the sizes of the liquid inlet collecting pipe and the liquid outlet collecting pipe are respectively greater than the size of the heat exchange unit. By arranging the liquid inlet collecting pipe and the liquid outlet collecting pipe in the stepped portion respectively, the space occupied by the heat exchange assembly in the arrangement direction of the battery cells, the support plate and the heat exchange assembly can be reduced.

[0039] In some embodiments of the present application, the first heat exchange pipe and the second heat exchange pipe are respectively heat exchange flat tubes.

[0040] The heat exchange flat tube can reduce the space occupied by the heat exchange unit, and facilitate the connection with the heat conduction member.

[0041] In some embodiments of the present application, the heat exchange assembly comprises a heat exchange plate, the inside of the heat exchange plate is formed with a first heat exchange cavity and a second heat exchange cavity arranged at intervals, the first heat exchange cavity and part of the heat exchange plate form a first heat exchange pipe, the second heat exchange cavity and part of the heat exchange plate form a second heat exchange pipe, and the first heat exchange pipe and the second heat exchange pipe are attached.

[0042] By arranging the heat exchange plate and forming the first heat exchange cavity and the second heat exchange cavity in the inside of the heat exchange plate, the heat exchange area of the heat exchange assembly and the battery cells can be increased, thereby improving the heat exchange efficiency of the heat exchange assembly and the battery cells. The plate-shaped structure can shield the battery cells and prevent external foreign matters from entering between the heat exchange plate and the battery cells.

[0043] In some embodiments of the present application, the inside of the heat exchange plate is formed with a plurality of first heat exchange cavities and a plurality of second heat exchange cavities, the plurality of first heat exchange cavities and the plurality of second heat exchange cavities are arranged alternately, and part of the heat exchange plate forms a plurality of first heat exchange pipes and a plurality of second heat exchange pipes respectively, and the plurality of first heat exchange pipes and the plurality of second heat exchange pipes are arranged alternately and attached.

[0044] By forming a plurality of first heat exchange cavities and a plurality of second heat exchange cavities in the heat exchange plate, and forming a plurality of first heat exchange pipes and a plurality of second heat exchange pipes, the number of heat exchange units is increased, and the heat exchange surface and the heat exchange efficiency of the heat exchange plate and the battery unit are improved through heat exchange of the plurality of heat exchange units with the battery unit respectively.

[0045] The second aspect of the present application also provides a battery pack, the battery pack being used for providing electric energy.

[0046] The third aspect of the present application also provides an energy storage device, the energy storage device comprising the battery pack of any one of the above, the battery pack being used for providing electric energy.

[0047] The above description is only a summary of the technical solutions of the present application, in order to enable one of ordinary skill in the art to better understand the technical means of the present application and implement the same according to the content of the description, and in order to make the above and other purposes, characteristics 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

[0048] 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. Furthermore, the same reference numerals are used throughout the several views that follow. In the drawings:

[0049] 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. Furthermore, the same reference numerals are used throughout the several views that follow. In the drawings:

[0050] FIG. 1 is a structural schematic diagram of a vehicle according to an embodiment of the present application;

[0051] FIG. 2 is a structural schematic diagram of a battery pack according to an embodiment of the present application;

[0052] FIG. 3 is a structural schematic diagram of a battery unit according to an embodiment of the present application;

[0053] FIG. 4 is an exploded structural schematic diagram of a battery cell according to an embodiment of the present application;

[0054] FIG. 5 is an exploded structural schematic diagram of a battery pack according to an embodiment of the present application;

[0055] FIG. 6 is a structural schematic diagram of a heat exchange assembly according to an embodiment of the present application;

[0056] Fig. 7 is a partial structural schematic view of the relative position of a heat exchange assembly and a battery cell according to an embodiment of the present application;

[0057] Fig. 8 is a structural schematic view of the relative position of a heat exchange assembly and a battery cell according to another embodiment of the present application;

[0058] Fig. 9 is a structural schematic view of the A-A cross section of the heat exchange assembly in Fig. 6;

[0059] Fig. 10 is a structural schematic view of a heat exchange assembly according to another embodiment of the present application;

[0060] Fig. 11 is a structural schematic view of a heat exchange assembly according to another embodiment of the present application;

[0061] Fig. 12 is a structural schematic view of the relative position of a heat exchange assembly and a support plate according to an embodiment of the present application;

[0062] Fig. 13 is a structural schematic view of an energy storage container according to an embodiment of the present application.

[0063] The reference signs in the detailed description are as follows: 1, vehicle; 10, battery pack; 11, controller; 12, motor; 20, battery unit; 21, battery cell; 211, end cover; 212, shell; 213, electrode assembly; 214, electrode terminal; 30, heat exchange assembly; 31, heat exchange unit; 311, first heat exchange pipe; 312, communication pipe; 313, second heat exchange pipe; 314, communication main pipe; 32, liquid inlet header; 33, liquid outlet header; 34, liquid inlet joint; 35, liquid outlet joint; 36, heat exchange plate; 40, box body; 41, box main body; 42, support plate; 421, mounting groove; 422, support part; 423, step part; 2, energy storage container; 201, cabinet body; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0064] 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 more clearly illustrate the technical solutions of the present application, and therefore cannot be used to limit the protection scope of the present application.

[0065] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meanings understood by the skilled in the art to which the embodiments of the present application belong.

[0066] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0067] 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.

[0068] 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, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it 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.

[0069] 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", "above" and "above" 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", "below" and "below" 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.

[0070] 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 hydroelectric, thermal, wind and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields.

[0071] With the development of new energy industry, new energy batteries are more used to heat the battery units by using the bent flat tubes. However, the existing bent flat tubes have a large space between adjacent tube segments, which reduces the effective coverage area of the bent flat tubes, and thus reduces the heat exchange area and efficiency of the bent flat tubes and the battery units. To solve the problem of low heat exchange efficiency of the flat tubes, 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 unit and the battery unit, and improve the heat exchange efficiency of the heat exchange unit and the battery unit.

[0072] The battery pack in the application can be applied to various electric devices and energy storage devices using the battery pack, 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, the 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.

[0073] 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 the battery pack. However, for the sake of simplicity, the following embodiments are described by taking the electric vehicle as an example.

[0074] 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 cells. As an example, the battery unit can be formed by bundling a plurality of battery cells by a cable tie.

[0075] FIG. 1 is a structural schematic diagram 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 a range extended vehicle, etc. The vehicle 1 is internally provided with a battery pack 10, which can be arranged at the bottom, the head, or the 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 an operating power source of the vehicle 1. The vehicle 1 can further 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.

[0076] In some embodiments of the application, the battery pack 10 can not only be used as an operating power source of the vehicle 1, but also be used as a driving power source of the vehicle 1, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1.

[0077] FIG. 2 is a schematic diagram of a structure of a battery pack 10 according to an embodiment of the present application. FIG. 3 is a schematic diagram of a structure of a 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 cells 21, which are the smallest units constituting the battery cell 20 or the battery pack. The plurality of battery cells 21 can be connected in series and / or in parallel via electrode terminals to be applied to various application scenarios. The battery referred to in the present application includes the battery cell 20 or the battery pack. The plurality of battery cells 21 can be connected in series or in parallel or in a hybrid manner, which is a mixture of series and parallel connection. The battery pack 10 can also be referred to as the battery pack. In the embodiments of the present application, the plurality of battery cells 21 can directly constitute the battery pack, or can first constitute the battery cell 20, and the battery cell 20 can then constitute the battery pack.

[0078] 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 cells 21 or the battery cells 20 to reduce the influence of liquid or other foreign matters on the charging or discharging of the battery cells 21. The box 40 can be a simple cuboid or a cylinder or a sphere, or a complex cuboid structure composed of a simple cuboid or a cylinder or a sphere. The material of the box 40 can be an alloy material such as an aluminum alloy or an iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam plastic, or a composite material such as glass fiber and epoxy resin.

[0079] The battery cell 20 can include a plurality of battery cells 21, which can be connected in series or in parallel or in a hybrid 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 hybrid manner to constitute the battery pack 10. The battery cell 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 cell 21 is generally divided into three types according to the packaging manner: cylindrical battery cells, square battery cells and soft-pack battery cells, which are not limited in the embodiments of the present application. However, for the sake of simplicity, the following embodiments are described by taking the square lithium-ion battery cell 21 as an example.

[0080] FIG. 4 is an exploded schematic diagram of the battery cell 21 according to some embodiments of the present application. The battery cell 21 is the smallest unit constituting the battery pack 10. As shown in FIG. 4, the battery cell 21 includes an end cover 211, a shell 212 and an electrode assembly 213.

[0081] The end cover 211 refers to a component that covers the opening of the housing 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 housing 212 to fit the housing 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 a pressing impact, 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 electric 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 electrically connected components in the housing 212 from the end cover 211 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, or the like.

[0082] The housing 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 housing 212 and the end cover 211 can be independent components, and an opening can be provided on the housing 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 housing 212 can also be integrated, specifically, the end cover 211 and the housing 212 can first form a common connecting surface before other components enter the housing, and when it is necessary to seal the internal environment of the housing 212, the end cover 211 is made to cover the housing 212. The housing 212 can have various shapes and sizes, such as cuboid, cylinder, hexagonal prism, etc. Specifically, the shape of the housing 212 can be determined according to the specific shape and size of the electrode assembly 213. The material of the housing 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0083] 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 included in the casing 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 terminal 214 to form a current loop.

[0084] In combination with FIGS. 2, 5, 6, and 7, in some embodiments of the present application, the battery pack 10 includes a battery unit 20 and a heat exchange assembly 30, the battery unit 20 includes a plurality of battery cells 21 arranged in a first direction X, the heat exchange assembly 30 includes at least one heat exchange unit 31, the heat exchange unit 31 includes a first heat exchange pipe 311, a communication pipe 312, and a second heat exchange pipe 313 connected in sequence, the heat exchange unit 31 is used to flow a heat exchange medium, the flow directions of the heat exchange medium in the first heat exchange pipe 311 and the second heat exchange pipe 313 are opposite, the communication pipe 312 is separately provided and connected with the first heat exchange pipe 311 and the second heat exchange pipe 313, respectively, and the battery unit 20 and the first heat exchange pipe 311 and the second heat exchange pipe 313 of the at least one heat exchange unit 31 are in heat exchange, respectively.

[0085] 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. Wherein, the battery pack 10 further includes a width direction and a height direction, the size of the battery pack 10 along the length direction is greater than the 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, respectively, and is generally arranged along a vertical direction. For the convenience of description, the present application only takes the first direction X as the length of the battery pack 10, the second direction as the width direction of the battery pack 10, and the third direction as the height direction of the battery pack 10 as an example for description. Four heat exchange units 31 arranged along the second direction Y are included in FIG. 6, wherein the direction indicated by the black straight arrow is the flow direction of the heat exchange medium in the heat exchange unit 31, and the heat exchange media in any two heat exchange units 31 do not flow into each other.

[0086] Specifically, the heat exchange unit 31 can be arranged at one side of the battery unit 20 along the second direction Y or the third direction Z and can exchange heat with the battery unit 20. As shown in FIG. 7, the heat exchange unit 31 is arranged at one side of the battery unit 20 along the third direction Z and can exchange heat with the battery unit 20. As shown in FIG. 8, the heat exchange unit 31 is arranged at one side of the battery unit 20 along the second direction Y and can exchange heat with the battery unit 20. For the convenience of description, the present application will be described by taking the heat exchange unit 31 arranged at one side of the battery unit 20 along the third direction Z as an example.

[0087] The heat exchange unit 31 comprises a first heat exchange pipe 311, a connecting pipe 312 and a second heat exchange pipe 313 connected in sequence. The connecting pipe 312 can be a straight pipe section without bending and has a split structure with the first heat exchange pipe 311 and the second heat exchange pipe 313 and can be connected with the first heat exchange pipe 311 and the second heat exchange pipe 313 by welding, clamping or bonding and the like. The first heat exchange pipe 311 and the second heat exchange pipe 313 are configured to exchange heat with the battery unit 20 to adjust the temperature of the battery unit 20. Optionally, the first heat exchange pipe 311 and the second heat exchange pipe 313 can be connected with the battery unit 20 in a close contact manner and directly exchange heat. Alternatively, the first heat exchange pipe 311 and the second heat exchange pipe 313 can be arranged in a spaced apart manner with the battery unit 20 to exchange heat by air flow or by a heat conducting member.

[0088] The first heat exchange pipe 311, the connecting pipe 312 and the second heat exchange pipe 313 are respectively internally provided with a cavity structure to flow a heat exchange medium. The heat exchange medium can adjust the temperature of the first heat exchange pipe 311, the connecting pipe 312 and the second heat exchange pipe 313 during the flow in the heat exchange unit 31. The first heat exchange pipe 311 and the second heat exchange pipe 313 exchange heat with the battery unit 20 to adjust the temperature of the battery unit 20. Since the connecting pipe 312 is arranged at one end of the heat exchange unit 31, only a part of the battery cells 21 can be connected with the connecting pipe 312 for heat exchange.

[0089] According to the battery pack 10 of the present application, by arranging and connecting the first heat exchange pipe 311, the connecting pipe 312 and the second heat exchange pipe 313 in a split manner, compared with arranging a bending section between adjacent heat exchange pipe sections, the interval size of the first heat exchange pipe 311 and the second heat exchange pipe 313 can be adjusted, such as being reduced, so as to increase the size of the first heat exchange pipe 311 and / or the second heat exchange pipe 313 along the arrangement direction of the first heat exchange pipe 311 and the second heat exchange pipe 313, thereby increasing the heat exchange area of the heat exchange unit 31 and the battery unit 20 and improving the heat exchange efficiency of the heat exchange unit 31 and the battery unit 20.

[0090] In combination with FIGS. 6 and 7, in some embodiments of the present application, the communication pipe 312 is arranged at one end of the heat exchange unit 31 along the first direction X, and the first heat exchange pipe 311 and the second heat exchange pipe 313 are respectively inserted into the communication pipe 312 along the first direction X and welded with the communication pipe 312.

[0091] Specifically, the communication pipe 312 is arranged at one end of the heat exchange unit 31 along the first direction X, and the flow direction of the heat exchange medium in the communication pipe 312 intersects the first direction X. The first heat exchange pipe 311 and the second heat exchange pipe 313 are respectively inserted into the communication pipe 312 along the first direction X, and the flow direction of the heat exchange medium in the first heat exchange pipe 311 and the flow direction of the heat exchange medium in the second heat exchange pipe 313 are respectively the same as the arrangement direction of the plurality of battery monomers 21 in the same battery unit 20. Optionally, the first heat exchange pipe 311 and the second heat exchange pipe 313 respectively pass through the surface of the communication pipe 312 on one side of the first direction X and are welded with the communication pipe 312.

[0092] The first heat exchange pipe 311 and the second heat exchange pipe 313 are respectively inserted into the communication pipe 312 along the first direction X, so that the first heat exchange pipe 311 and the second heat exchange pipe 313 can respectively exchange heat with the plurality of battery monomers 21 arranged in layers along the first direction X, thereby improving the heat exchange efficiency of the heat exchange unit 31 and the battery unit 20. Meanwhile, the first heat exchange pipe 311 and the second heat exchange pipe 313 arranged separately can be connected with the communication pipe 312 into the heat exchange unit 31 by welding, and the sealing performance of the connection between the first heat exchange pipe 311 and the communication pipe 312 and the connection between the second heat exchange pipe 313 and the communication pipe 312 is improved.

[0093] In combination with FIGS. 6 and 7, in some embodiments of the present application, the communication pipe 312 is arranged beyond the end of the battery unit 20 along the first direction X.

[0094] Specifically, the projection of the battery unit 20 on the surface of the heat exchange assembly 30 does not overlap the communication pipe 312, that is, the communication pipe 312 does not exchange heat with the battery unit 20 and is only used to guide the first heat exchange pipe 311 and the second heat exchange pipe 313.

[0095] By arranging the communication pipe 312 beyond the end of the battery unit 20 along the first direction X, the battery unit 20 can only exchange heat with the first heat exchange pipe 311 and the second heat exchange pipe 313, and since the flow directions of the heat exchange medium in the first heat exchange pipe 311 and the heat exchange medium in the second heat exchange pipe 313 are opposite, the temperature consistency of the battery unit 20 is improved.

[0096] In combination with FIGS. 6 and 7, in some embodiments of the present application, the plurality of battery monomers 21 in the battery unit 20 respectively exchange heat with the first heat exchange pipe 311 and the second heat exchange pipe 313 in the heat exchange unit 31, and the heat exchange area of the plurality of battery monomers 21 with the heat exchange unit 31 is equal.

[0097] Specifically, each battery cell 21 exchanges heat with the first heat exchange pipe 311 and the second heat exchange pipe 313, and different battery cells 21 have equal common heat exchange areas with the first heat exchange pipe 311 and the second heat exchange pipe 313.

[0098] Since the plurality of battery cells 21 respectively have equal heat exchange areas with the heat exchange unit 31, the temperature consistency of the plurality of battery cells 21 in the battery cell 20 can be improved.

[0099] In combination with FIGS. 5 to 7, in some embodiments of the present application, the heat exchange assembly 30 includes a plurality of heat exchange units 31, and the plurality of heat exchange units 31 are arranged at intervals along the second direction Y, and the first direction X and the second direction Y are perpendicular to each other.

[0100] Specifically, the plurality of heat exchange units 31 are arranged at intervals along the second direction Y and are respectively used for heat exchange with the same battery cell 20. Alternatively, the plurality of heat exchange units 31 are arranged at intervals along the second direction Y and are respectively used for heat exchange connection with the plurality of battery cells 20.

[0101] By arranging the plurality of heat exchange units 31, the plurality of heat exchange units 31 can respectively exchange heat with the battery cell 20, thereby improving the heat exchange efficiency of the heat exchange assembly 30.

[0102] In combination with FIGS. 5, 6 and 9, in some embodiments of the present application, the heat exchange assembly 30 further includes a liquid inlet collecting pipe 32 and a liquid outlet collecting pipe 33, the liquid inlet collecting pipe 32 and the liquid outlet collecting pipe 33 are respectively arranged at one end of the heat exchange unit 31 away from the communication pipe 312 along the first direction X, one end of the first heat exchange pipe 311 away from the communication pipe 312 is provided with a liquid inlet, one end of the second heat exchange pipe 313 away from the communication pipe 312 is provided with a liquid outlet, the liquid inlet of any heat exchange unit 31 is respectively communicated with the liquid inlet collecting pipe 32, and the liquid outlet of any heat exchange unit 31 is respectively communicated with the liquid outlet collecting pipe 33.

[0103] Specifically, the inside of the liquid inlet collecting pipe 32 and the liquid outlet collecting pipe 33 is respectively a through structure. By communicating the liquid inlet of any heat exchange unit 31 with the liquid inlet collecting pipe 32, the heat exchange medium is respectively input to the plurality of heat exchange units 31 through the liquid inlet collecting pipe 32, by communicating the liquid outlet of any heat exchange unit 31 with the liquid outlet collecting pipe 33, the heat exchange medium in the plurality of heat exchange units 31 is output through the liquid outlet collecting pipe 33, thereby improving the flowability of the heat exchange medium in the heat exchange unit 31.

[0104] In combination with FIGS. 5, 6 and 9, in some embodiments of the present application, the liquid inlet collecting pipe 32 and the liquid outlet collecting pipe 33 are arranged at intervals or are attached along the third direction Z, and the third direction Z is respectively perpendicular to the first direction X and the second direction Y.

[0105] Specifically, the liquid inlet header 32 and the liquid outlet header 33 are arranged at one end of the heat exchange unit 31 away from the communication pipe 312 along the first direction X, which can reduce the space occupied by the liquid inlet header 32 and the liquid outlet header 33 along the first direction X, compared with arranging the liquid inlet header 32 and the liquid outlet header 33 at two ends of the heat exchange unit 31 along the first direction X respectively.

[0106] Since the liquid inlet header 32 and the liquid outlet header 33 are arranged at the same side of the heat exchange unit 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 close contact or spaced apart along the third direction Z, so as to connect the liquid inlet with the liquid inlet header 32 and connect the liquid outlet with the liquid outlet header 33.

[0107] In combination with FIGS. 5 and 6, in some embodiments of the present application, the communication pipes 312 of the plurality of heat exchange units 31 are sequentially connected and form a communication main pipe 314, and the communication pipes 312 of the plurality of heat exchange units 31 are not connected to each other.

[0108] Specifically, the communication main pipe 314 is a straight pipe structure, and a cavity is formed inside the communication main pipe 314. A plurality of baffles are arranged in the cavity and spaced apart along the second direction Y, so as to separate the inside of the communication main pipe 314 into a plurality of communication pipes 312 that are not connected to each other by the baffles. The two ends of any communication pipe 312 along the second direction Y are respectively connected with the first heat exchange pipe 311 and the second heat exchange pipe 313, so as to form a plurality of heat exchange units 31 through the plurality of communication pipes 312.

[0109] The plurality of communication pipes 312 are formed in one communication main pipe 314, which facilitates the overall assembly of the plurality of communication pipes 312, and the plurality of communication pipes 312 are arranged to be disconnected from each other and not connected to each other, so as to form a plurality of heat exchange units 31 for heat exchange with the battery cells 20 respectively.

[0110] As shown in FIG. 10, in some embodiments of the present application, the communication pipes 312 of any two adjacent heat exchange units 31 are arranged to be spaced apart.

[0111] Specifically, the plurality of heat exchange units 31 are arranged independently of each other, and the communication pipes 312 of any two heat exchange units 31 are not connected to each other. The plurality of communication pipes 312 are arranged to be spaced apart, which facilitates the separate arrangement of the plurality of communication pipes 312, and the plurality of heat exchange units 31 are formed through the plurality of communication pipes 312, so as to be used for heat exchange with the battery cells 20 through the plurality of heat exchange units 31 respectively.

[0112] In some embodiments of the present application, as shown in FIGS. 5-8, the battery unit 20 is provided with the heat exchange unit 31 on at least one side of the battery unit 20 along the second direction Y, and the first heat exchange pipe 311 and the second heat exchange pipe 313 are arranged along the third direction Z. Alternatively, the battery unit 20 is provided with the heat exchange unit 31 on at least one side of the battery unit 20 along the third direction Z, and the first heat exchange pipe 311 and the second heat exchange pipe 313 are arranged along the second direction Y, wherein the first direction X intersects the second direction Y, and the third direction Z is perpendicular to the first direction X and the second direction Y.

[0113] As shown in FIG. 8, 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 units 31 arranged along the second direction Y. The first heat exchange pipe 311 and the second heat exchange pipe 313 in the same heat exchange unit 31 are arranged along the third direction Z and are arranged on at least one side of the battery unit 20 along the second direction Y, so as to exchange heat with the battery unit 20 along the second direction Y.

[0114] Since the plurality of battery cells 21 in the battery unit 20 are arranged along the first direction X, the heat exchange unit 31 is arranged on at least one side of the battery unit 20 along the second direction Y, and the heat exchange unit 31 can exchange heat with all the battery cells 21 in the battery unit 20, respectively, thereby improving the heat exchange efficiency of the battery unit 20.

[0115] As shown in FIGS. 6 and 7, 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 units 31 arranged along the second direction Y. The first heat exchange pipe 311 and the second heat exchange pipe 313 in the same heat exchange unit 31 are arranged along the second direction Y 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.

[0116] Since the plurality of battery cells 21 in the battery unit 20 are arranged along the first direction X, the heat exchange unit 31 is arranged on at least one side of the battery unit 20 along the third direction Z, and the heat exchange unit 31 can exchange heat with all the battery cells 21 in the battery unit 20, respectively, thereby improving the heat exchange efficiency of the battery unit 20.

[0117] As shown in FIG. 7, in some embodiments of the present application, along the arrangement direction of the first heat exchange pipe 311 and the second heat exchange pipe 313, the size of the first heat exchange pipe 311 is L1, the size of the second heat exchange pipe 313 is L2, and the size of the battery unit 20 is L3, wherein L1+L2≤L3.

[0118] Specifically, along the second direction Y, the size of the first heat exchange pipe 311 is L1, the size of the second heat exchange pipe 313 is L2, and the length size of the battery cell 20 is L3, where L1+L2≤L3. When L1+L2=L3, the first heat exchange pipe 311 and the second heat exchange pipe 313 are arranged in abutment along the second direction Y and completely cover the surface of the battery cell 21 along the third direction. When L1+L2<L3, the first heat exchange pipe 311 and the second heat exchange pipe 313 can be arranged in intervals along the second direction Y, thereby increasing the interval size of the first heat exchange pipe 311 and the second heat exchange pipe 313 and making the heat exchange between the heat exchange unit 31 and the battery cell 20 more uniform.

[0119] By setting L1+L2≤L3, the battery cell 20 can be simultaneously connected to the first heat exchange pipe 311 and the second heat exchange pipe 313 in the same heat exchange unit 31 for heat exchange, thereby improving the heat exchange efficiency between the heat exchange unit 31 and the battery cell 20. At the same time, the flow directions of the heat exchange medium in the first heat exchange pipe 311 and the second heat exchange pipe 313 are opposite, so the temperature consistency of the battery cell 20 can be improved.

[0120] As shown in FIG. 7, in some embodiments of the present application, 2≤L3 / L1≤5 and / or 2≤L3 / L2≤5.

[0121] When L3 / L1=2 and L3 / L2=2, i.e., L1+L2=L3, the first heat exchange pipe 311 and the second heat exchange pipe 313 are arranged in abutment along the second direction Y, and the surface of the battery cell 20 along the third direction Z is simultaneously connected to the first heat exchange pipe 311 and the second heat exchange pipe 313 in the same heat exchange unit 31 for heat exchange. When at least one of L3 / L1 and L3 / L2 is greater than 2, i.e., L1+L2<L3, the first heat exchange pipe 311 and the second heat exchange pipe 313 can be arranged in intervals along the second direction Y, thereby increasing the interval size of the first heat exchange pipe 311 and the second heat exchange pipe 313 and making the heat exchange between the heat exchange unit 31 and the battery cell 20 more uniform. Alternatively, two heat exchange units 31 can be provided on one side of the battery cell 20 along the third direction Z, and the two heat exchange units 31 can collectively exchange heat with the battery cell 20. Specifically, the ratio of L3 to L1 can be any value between 2…2.5…3…3.5…4…5. The ratio of L3 to L2 can be any value between 2…2.5…3…3.5…4…5.

[0122] By setting 2≤L3 / L1≤5, the heat exchange area and heat exchange efficiency between the first heat exchange pipe 311 and the battery cell 20 can be improved without occupying too much heat exchange area of the second heat exchange pipe 313. By setting 2≤L3 / L2≤5, the heat exchange area and heat exchange efficiency between the second heat exchange pipe 313 and the battery cell 20 can be improved without occupying too much heat exchange area of the first heat exchange pipe 311.

[0123] As shown in FIG. 7, in some embodiments of the present application, L1 is in the range of 10mm-500mm, and / or, L2 is in the range of 10mm-500mm, and / or, L3 is in the range of 20mm-1000mm.

[0124] Specifically, L1 can be in the range of 10mm…40mm…100mm…200mm…500mm. L2 can be in the range of 10mm…40mm…100mm…200mm…500mm. L3 can be in the range of 20mm…80mm…200mm…400mm…1000mm.

[0125] It should be understood by those skilled in the art that when the tubular structure is bent, the larger the size of L1 and L2, the larger the required bending radius size, thereby resulting in an increase in the spacing size between the bent pipe bodies. Compared with the bent flat pipe in the prior art, by setting the first heat exchange pipe 311, the communication pipe 312 and the second heat exchange pipe 313 in a split structure, the first heat exchange pipe 311 and the second heat exchange pipe 313 do not need to be bent, thereby being able to adjust the spacing size between the first heat exchange pipe 311 and the second heat exchange pipe 313 as needed, such as reducing the spacing size between the first heat exchange pipe 311 and the second heat exchange pipe 313, thereby facilitating the increase in the size of the first heat exchange pipe 311 and / or the second heat exchange pipe 313, thereby increasing the heat exchange area of the heat exchange unit 31 with the battery unit 20 and improving the heat exchange efficiency of the heat exchange unit 31 with the battery unit 20.

[0126] Setting the range of L1 to be 10mm-500mm can improve the heat exchange area and efficiency of the first heat exchange pipe 311 with the battery unit 20, setting the range of L2 to be 10mm-500mm can improve the heat exchange area and efficiency of the second heat exchange pipe 313 with the battery unit 20, and setting the range of L3 to be 20mm-1000mm can enable the battery unit 20 to exchange heat with the first heat exchange pipe 311 and the second heat exchange pipe 313 respectively.

[0127] In combination with FIGS. 5, 6 and 11, in some embodiments of the present application, the battery pack 10 further comprises a box body 40, the box body 40 comprising a box body 41 and a support plate 42, the box body 41 and the support plate 42 being connected and forming an installation cavity therebetween for accommodating the battery unit 20, wherein the support plate 42 is formed with an installation groove 421 facing away from the battery unit 20, the battery unit 20 is arranged in the installation groove 421, and the heat exchange unit 31 is arranged on the outer surface of the installation groove 421 away from the battery unit 20.

[0128] Specifically, the box body 40 includes a box body 41 and a support plate 42. The box body 41 is a hollow structure with one end open. 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 unit 20. Alternatively, the box body 41 and the support plate 42 can both be hollow structures with one side open. 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. The support plate 42 is recessed in a direction away from the battery unit 21 to form an installation groove 421. The battery unit 20 can be arranged in the installation groove 421 and fixed. The support plate 42 can be a heat-conducting member. One side of the battery unit 20 along the third direction Z is in heat-conducting connection with the support plate 42. The first heat exchange pipe 311 and the second heat exchange pipe 313 of the heat exchange unit 31 can be arranged in close contact with the outer surface of the installation groove 421 away from the battery unit 20 and in heat-conducting connection with the support plate 42. Thus, the heat exchange unit 31 can exchange heat with the battery unit 20 through the support plate 42.

[0129] By arranging the battery unit 20 in the installation groove 421 and arranging the heat exchange unit 31 in close contact with the outer surface of the installation groove 421 away from the battery unit 20, the heat exchange unit 31 can exchange heat with the battery unit 20 through the support plate 42, thereby adjusting the temperature of the battery unit 20.

[0130] In some embodiments of the present application, the heat exchange unit 31 can also be arranged on the surface of the support plate 42 facing the battery unit 20 along the third direction Z according to actual installation requirements and welded or bonded to the support plate 42.

[0131] In some embodiments of the present application, the heat exchange unit 31 can also be arranged between two adjacent battery units 20 along the second direction Y according to actual installation requirements and in heat exchange connection with the battery units 20 along the second direction Y.

[0132] In some embodiments of the present application, the heat exchange unit can also be arranged between the battery unit 20 and the side wall of the box body 41 along the second direction Y according to actual installation requirements and welded or bonded to the box body 41.

[0133] Any of the above arrangement modes can exchange heat between the heat exchange unit 31 and the battery unit 20, thereby adjusting the temperature of the battery unit 20.

[0134] In some embodiments of the present application, as shown in FIGS. 5, 6 and 11, the edge of the installation groove 421 forms a support portion 422. The support portion 422 and the bottom surface of the installation groove 421 form a stepped portion 423. At least part of the liquid inlet collecting pipe 32 and / or at least part of the liquid outlet collecting pipe 33 are arranged on the stepped portion 423.

[0135] Specifically, the support portion 422 is annularly arranged at the edge of the mounting groove 421 and is used to connect with the opening end of the box body 41. In the third direction Z, the support portion 422 is spaced apart from the bottom of the mounting groove 421 and forms a stepped portion 423.

[0136] In the arrangement direction of the battery cell 20, the support plate 42 and the heat exchange assembly 30, i.e. in the third direction Z, the sizes of the liquid inlet header 32 and the liquid outlet header 33 are greater than the size of the heat exchange unit 31. Since the heat exchange unit 31 is arranged to adhere to the outer surface of the mounting groove 421 away from the battery cell 20, at least part of the liquid inlet header 32 and at least part of the liquid outlet header 33 are arranged in the stepped portion 423, which can reduce the space occupied by the heat exchange assembly 30 in the arrangement direction of the battery cell 20, the support plate 42 and the heat exchange assembly 30.

[0137] In combination with FIGS. 6 and 7, in some embodiments of the present application, the first heat exchange pipe 311 and the second heat exchange pipe 313 are heat exchange flat pipes.

[0138] Specifically, the first heat exchange pipe 311 and the second heat exchange pipe 313 are substantially flat structures, i.e. in a direction perpendicular to the length direction of the first heat exchange pipe 311 and the second heat exchange pipe 313, the first heat exchange pipe 311 and the second heat exchange pipe 313 respectively have a cross section, and in the cross section of any one, the size in one of the two perpendicular directions is greater than the size in the other direction.

[0139] The heat exchange flat pipe can reduce the space occupied by the heat exchange unit and facilitate the adhesion connection with the heat conducting member.

[0140] As shown in FIG. 12, in some embodiments of the present application, the heat exchange assembly 30 includes a heat exchange plate 36, the inside of the heat exchange plate 36 is formed with a first heat exchange cavity and a second heat exchange cavity arranged at intervals, the first heat exchange cavity and part of the heat exchange plate 36 form the first heat exchange pipe 311, the second heat exchange cavity and part of the heat exchange plate 36 form the second heat exchange pipe 313, and the first heat exchange pipe 311 and the second heat exchange pipe 313 are in adhesion.

[0141] Specifically, the heat exchange plate 36 is a substantially plate structure, and the first heat exchange cavity and the second heat exchange cavity are arranged at intervals in the second direction Y inside the heat exchange plate 36, and the first heat exchange cavity and the second heat exchange cavity are communicated through the communication pipe 312. The first heat exchange cavity and part of the heat exchange plate 36 wrapped outside the first heat exchange cavity form the first heat exchange pipe 311, and the second heat exchange cavity and part of the heat exchange plate 36 wrapped outside the second heat exchange cavity form the second heat exchange pipe 313.

[0142] By setting the heat exchange plate 36 and forming the first heat exchange cavity and the second heat exchange cavity inside the heat exchange plate 36, the heat exchange area of the heat exchange assembly 30 and the battery unit 20 can be increased, thereby improving the heat exchange efficiency of the heat exchange assembly 30 and the battery unit 20. The plate-shaped structure can shield the battery unit 20 and prevent external foreign matter from entering between the heat exchange plate 36 and the battery unit 20.

[0143] As shown in FIG. 12, in some embodiments of the present application, a plurality of first heat exchange cavities and a plurality of second heat exchange cavities are formed inside the heat exchange plate 36, the plurality of first heat exchange cavities and the plurality of second heat exchange cavities are sequentially and alternately arranged, and a plurality of first heat exchange pipes 311 and a plurality of second heat exchange pipes 313 are formed by the plurality of first heat exchange cavities and the plurality of second heat exchange cavities, respectively. The plurality of first heat exchange pipes 311 and the plurality of second heat exchange pipes 313 are sequentially and alternately arranged and adhered.

[0144] Specifically, a plurality of first heat exchange cavities and a plurality of second heat exchange cavities are formed inside the heat exchange plate 36 along the second direction Y, and the first heat exchange cavities and the second heat exchange cavities are sequentially and alternately arranged along the second direction Y. The heat exchange plate 36 is provided with a communication main pipe 314, the communication main pipe 314 is formed with a plurality of communication pipes 312, and the two ends of any one of the communication pipes 312 along the second direction Y are respectively connected to one first heat exchange cavity and one second heat exchange cavity, thereby forming a plurality of heat exchange units 31 arranged and adhered along the second direction Y.

[0145] By forming a plurality of first heat exchange cavities and a plurality of second heat exchange cavities inside the heat exchange plate 36, and forming a plurality of first heat exchange pipes 311 and a plurality of second heat exchange pipes 313, the number of heat exchange units 31 is increased, and the heat exchange surface and the heat exchange efficiency of the heat exchange plate 36 and the battery unit 20 are improved by heat exchange between the plurality of heat exchange units 31 and the battery unit 20.

[0146] As shown in FIG. 1, the second aspect of the present application proposes a power utilization device, which comprises the battery pack 10 of any one of the above embodiments, and the battery pack 10 is used to provide electric energy.

[0147] Since the power utilization device in the present application has the same technical features as the battery pack 10 of any one of the above embodiments, the same technical effects can be achieved, and here will not be repeated.

[0148] As shown in FIG. 1, in some embodiments of the present application, the power utilization device can be a vehicle 1, which comprises the battery pack 10 of any one of the above embodiments, and the battery pack 10 is used to provide electric energy for the vehicle 1 and drive the vehicle 1 to move.

[0149] As shown in FIG. 13, the third aspect of the present application proposes an energy storage device, which comprises the battery pack 10 of any one of the above embodiments, and the battery pack 10 is used to provide electric energy.

[0150] 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 repeated.

[0151] As shown in FIG. 13, in some embodiments of the present application, the energy storage device can be an energy storage container 2, which includes 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 electrical energy for the energy storage container 2.

[0152] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, which can be implemented according to the content of the specification, 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.

[0153] As shown in FIG. 1, in some embodiments of the present application, a vehicle 1 includes a battery pack 10, which is used to provide electrical energy for the vehicle 1 and drive the vehicle 1 to walk.

[0154] As shown in FIG. 2 and FIG. 5, the battery pack 10 includes a box body 40, a battery unit 20 and a heat exchange assembly 30, the box body 40 includes a box body 41 and a support plate 42, the box body 41 and the support plate 42 are connected and form an installation cavity therebetween, and the battery unit 20 is arranged in the installation cavity. The surface of the support plate 42 facing the battery unit 20 is formed with an installation groove 421, and the battery unit 20 is arranged in the installation groove 421.

[0155] As shown in FIG. 2, FIG. 5 and FIG. 6, the battery pack 10 includes a plurality of battery units 20 arranged along a second direction Y, and any one of the battery units 20 includes a plurality of battery monomers 21 arranged in layers along a first direction X. The heat exchange assembly 30 includes a plurality of heat exchange units 31, which are arranged in a plurality of heat exchange units 31 along the second direction Y, and are arranged in the installation groove 421 away from the outer surface of the battery unit 20 along the third direction Z, and are in heat exchange with the battery unit 20 through the support plate 42. Wherein, the first direction X intersects with the second direction Y, and the third direction Z is perpendicular to the first direction X and the second direction Y respectively.

[0156] The heat exchange unit 31 comprises a first heat exchange pipe 311, a communication pipe 312 and a second heat exchange pipe 313 connected in sequence. The heat exchange unit 31 is used for flowing a heat exchange medium, the flow directions of the heat exchange medium in the first heat exchange pipe 311 and the second heat exchange pipe 313 are opposite, the communication pipe 312 is separately arranged and connected with the first heat exchange pipe 311 and the second heat exchange pipe 313, and the battery unit 20 exchanges heat with the first heat exchange pipe 311 and the second heat exchange pipe 313 of at least one heat exchange unit 31. The first heat exchange pipe 311 and the second heat exchange pipe 313 are arranged at intervals along the second direction Y, and the communication pipe 312 is arranged at one end of the heat exchange unit 31 along the first direction X, and the communication pipe 312 is arranged beyond the end of the battery unit 20 along the first direction X. The first heat exchange pipe 311 and the second heat exchange pipe 313 are respectively inserted into the communication pipe 312 along the first direction X and are welded with the communication pipe 312. The plurality of battery monomers 21 in the battery unit 20 respectively exchange heat with the first heat exchange pipe 311 and the second heat exchange pipe 313 in the heat exchange unit 31, and the plurality of battery monomers 21 respectively exchange heat with the heat exchange areas of the heat exchange unit 31. The communication pipes 312 of the plurality of heat exchange units 31 are connected in sequence and form a communication main pipe 314, and the communication pipes 312 of the plurality of heat exchange units 31 are not communicated with each other.

[0157] The first heat exchange pipe 311 and the second heat exchange pipe 313 are respectively heat exchange flat pipes and are arranged on the outer surface of the mounting groove 421 away from the battery unit 20, and the first heat exchange pipe 311 and the second heat exchange pipe 313 are heat exchange connected with the battery unit 20 through the support plate 42. Among them, along the second direction Y, the size of the first heat exchange pipe 311 is L1, the size of the second heat exchange pipe 313 is L2, and the size of the battery monomer 21 is L3, L1+L2≤L3. At the same time, 2≤L3 / L1≤5, and / or, 2≤L3 / L1≤5. The value range of L1 is 10mm-500mm, the value range of L2 is 10mm-500mm, and the value range of L3 is 20mm-1000mm.

[0158] As shown in FIGS. 5, 6 and 9, the heat exchange assembly 30 further comprises an inlet liquid collecting pipe 32 and an outlet liquid collecting pipe 33, the inlet liquid collecting pipe 32 and the outlet liquid collecting pipe 33 are arranged at the other end of the heat exchange unit 31 away from the communication pipe 312 along the first direction X, the inlet liquid collecting pipe 32 and the outlet liquid collecting pipe 33 are arranged in close contact along the third direction Z, the end of the first heat exchange pipe 311 away from the communication pipe 312 is provided with an inlet port, the end of the second heat exchange pipe 313 away from the communication pipe 312 is provided with an outlet port, the inlet ports of the plurality of first heat exchange pipes 311 are respectively communicated with the inlet liquid collecting pipe 32, and the outlet ports of the plurality of second heat exchange pipes 313 are respectively communicated with the outlet liquid collecting pipe 33. Among them, the edge of the mounting groove 421 forms a support part 422, the support part 422 and the bottom surface of the mounting groove 421 form a stepped part 423, and at least part of the inlet liquid collecting pipe 32 and at least part of the outlet liquid collecting pipe 33 are arranged on the stepped part 423.

[0159] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features 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 first direction. The heat exchange assembly comprises at least one heat exchange unit, which comprises a first heat exchange pipe, a connecting pipe and a second heat exchange pipe connected in sequence.

2. The battery pack of claim 1, wherein, The connecting pipe is arranged at one end of the heat exchange unit along the first direction.

3. The battery pack of claim 2, wherein, The first heat exchange pipe and the second heat exchange pipe are respectively inserted into the connecting pipe along the first direction and are welded with the connecting pipe.

4. The battery pack of claim 3, wherein, Along the first direction, the connecting pipe is arranged beyond the end of the battery unit.

5. The battery pack according to any one of claims 1 to 4, wherein, The plurality of battery cells in the battery unit are respectively exchanged with the first heat exchange pipe and the second heat exchange pipe in the heat exchange unit, and the plurality of battery cells are respectively equal to the heat exchange area of the heat exchange unit.

6. The battery pack of claim 5, wherein, The heat exchange assembly comprises a plurality of heat exchange units arranged at intervals along a second direction.

7. The battery pack of claim 6, wherein, The heat exchange assembly further comprises a liquid inlet collecting pipe and a liquid outlet collecting pipe arranged at the end of the heat exchange unit away from the connecting pipe along the first direction.

8. The battery pack of claim 5, wherein, The first heat exchange pipe is provided with a liquid inlet at the end away from the connecting pipe, and the second heat exchange pipe is provided with a liquid outlet at the end away from the connecting pipe.

9. The battery pack of claim 5, wherein, The liquid inlet of any heat exchange unit is respectively communicated with the liquid inlet collecting pipe, and the liquid outlet of any heat exchange unit is respectively communicated with the liquid outlet collecting pipe.

10. The battery pack according to any one of claims 1 to 9, wherein, The liquid inlet collecting pipe and the liquid outlet collecting pipe are arranged at intervals or are attached along a third direction.

11. The battery pack according to any one of claims 1 to 9, wherein, The connecting pipes of the plurality of heat exchange units are connected in sequence and form a connecting main pipe, and the connecting pipes of the plurality of heat exchange units are not communicated with each other.

12. The battery pack of claim 11, wherein, Any two adjacent heat exchange units are arranged at intervals. The battery unit is provided with the heat exchange unit along at least one side of the second direction, and the first heat exchange pipe and the second heat exchange pipe are arranged at intervals along the third direction. The size of the first heat exchange pipe is L1, the size of the second heat exchange pipe is L2, and the size of the battery unit is L3 along the arrangement direction of the first heat exchange pipe and the second heat exchange pipe. 2<=L3 / L1<=5, and / or 2<=L3 / L2<=5.

13. The battery pack of claim 11, wherein, L1 is in the range of 10mm-500mm, and / or, L2 is in the range of 10mm-500mm, and / or, L3 is in the range of 20mm-1000mm.

14. The battery pack of claim 6, wherein, The battery pack further comprises a box body and a support plate connected to each other and forming an installation cavity between them for accommodating the battery cells, wherein the support plate is formed with an installation groove facing away from the battery cells, the battery cells are arranged in the installation groove, and the heat exchange unit is arranged on the outer surface of the installation groove facing away from the battery cells.

15. The battery pack of claim 14, wherein, An edge of the installation groove is formed with a support portion, the support portion and a bottom surface of the installation groove form a stepped portion, and at least part of the liquid inlet collecting pipe and / or at least part of the liquid outlet collecting pipe are arranged in the stepped portion.

16. The battery pack of any one of claims 1 to 15, wherein, The first heat exchange pipe and the second heat exchange pipe are heat exchange flat tubes.

17. The battery pack of any one of claims 1 to 15, wherein, The heat exchange assembly comprises a heat exchange plate, an inner portion of the heat exchange plate is formed with a first heat exchange cavity and a second heat exchange cavity arranged at intervals, the first heat exchange cavity and part of the heat exchange plate form the first heat exchange pipe, the second heat exchange cavity and part of the heat exchange plate form the second heat exchange pipe, and the first heat exchange pipe and the second heat exchange pipe are arranged in close contact.

18. The battery pack of claim 17, wherein, The inner portion of the heat exchange plate is formed with a plurality of first heat exchange cavities and a plurality of second heat exchange cavities, the plurality of first heat exchange cavities and the plurality of second heat exchange cavities are arranged alternately in sequence, and part of the heat exchange plate forms a plurality of first heat exchange pipes and a plurality of second heat exchange pipes, respectively, and the plurality of first heat exchange pipes and the plurality of second heat exchange pipes are arranged alternately in sequence and in close contact.

19. An electrical device, comprising: The power utilization equipment comprises the battery pack of any one of claims 1 to 18, and the battery pack is used to provide electric energy.

20. An energy storage device, wherein, The energy storage device comprises the battery pack of any one of claims 1 to 18, and the battery pack is used to provide electric energy.

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