Heat exchange assembly, battery device and power utilization device

Abstract

The embodiment of the invention provides a heat exchange assembly, a battery device and an electric device. The battery device comprises a box body, a heat exchange assembly and a plurality of single batteries, the plurality of single batteries are arranged in the box body; the heat exchange assembly comprises a heat exchange piece and a current collector. At least one medium flow channel is arranged in the heat exchange part and is used for conducting a heat exchange medium, and the heat exchange medium is used for exchanging heat with the plurality of single batteries. The current collector is provided with a current collecting space and a liquid passing opening communicated with the current collecting space, and the current collecting space is communicated with at least part of the medium flow channel. At least part of the heat exchange piece and / or at least part of the current collector are / is arranged to be of a rigid structure, at least part of the heat exchange piece and / or at least part of the current collector are / is arranged to be of a flexible structure so that the heat exchange piece can be flexibly connected with the current collector, and the elastic modulus of the rigid structure is larger than that of the flexible structure. The heat exchange piece comprises a heat exchange body, the heat exchange body is of a rigid structure, and a medium flow channel is formed in the heat exchange body.

Description

Technical Field

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

[0002] In new energy vehicles equipped with battery devices, the battery devices can be used to provide power in whole or in part. During the use of the battery device, the battery cells in the battery device will generate heat. If the heat is too high, it will have an adverse effect on the performance and service life of the battery device. Therefore, how to effectively dissipate the heat of the battery cells of the battery device while improving the reliability of the heat exchange component has become an important research direction in this field. Summary of the invention

[0003] In view of this, the embodiments of the present application hope to provide a heat exchange component, a battery device, and an electrical device, which can improve the reliability of the heat exchange component to a certain extent.

[0004] To this end, a first aspect of an embodiment of the present application provides a battery device, including: Box; A plurality of battery cells, wherein the plurality of battery cells are arranged in the box; A heat exchange assembly, the heat exchange assembly comprising a heat exchange element and a current collector, the heat exchange element having at least one medium flow channel therein, the at least one medium flow channel being used to conduct a heat exchange medium, the heat exchange medium being used to exchange heat with the plurality of battery cells, the current collector being provided with a flow collection space and a liquid port communicating with the flow collection space, the flow collection space being communicated with at least part of the medium flow channel; At least part of the heat exchange element and / or at least part of the current collector is configured as a rigid structure, and at least part of the heat exchange element and / or at least part of the current collector is configured as a flexible structure, so that the heat exchange element is flexibly connected to the current collector, and the elastic modulus of the rigid structure is greater than the elastic modulus of the flexible structure; Wherein, the heat exchange element comprises a heat exchange body, the heat exchange body is configured as a rigid structure, and the medium flow channel is formed inside the heat exchange body.

[0005] The battery device provided in the embodiment of the present application includes a housing, a heat exchange assembly and a plurality of battery cells, wherein the plurality of battery cells are arranged in the housing, and the housing plays a protective role on the battery cells. The heat exchange assembly is used to exchange heat with the battery cells, and the heat exchange assembly is flexibly connected to the current collector by setting at least part of the heat exchange element and / or at least part of the current collector as a flexible structure, that is, at least part of the current collector and the heat exchange element are connected in a manner that can cause axial expansion and contraction, folding and a certain amount of vertical axial displacement. In this way, when the heat exchange element or the current collector is collided or squeezed by an external force, the heat exchange element and the current collector can be deformed through the flexible connection structure, which can improve the situation of damage and leakage of the heat exchange assembly to a certain extent, thereby helping to improve the reliability of the heat exchange assembly. In addition, the flexible connection structure between the heat exchange element and the current collector is also conducive to absorbing the assembly tolerance between the heat exchange element and the current collector, thereby helping to improve the assembly efficiency and connection reliability between the heat exchange element and the current collector, and between the heat exchange assembly and the housing.

[0006] In some embodiments, the heat exchange element includes a transition element, and the heat exchange body is connected to the current collector via the transition element.

[0007] The provision of the adapter facilitates the connection between the heat exchange component and the current collector, thereby improving assembly efficiency and connection reliability.

[0008] In some embodiments, the current collector includes a connector, the connector is provided with the liquid port, and the connector is configured as a rigid structure.

[0009] The connecting piece is set as a rigid structure, that is, the elastic modulus of the connecting piece is greater than the elastic modulus of the flexible structure. On the one hand, the connecting piece can have sufficient structural strength. On the other hand, the heat exchange component and the current collector can be deformed through the flexible connecting structure, which can improve the situation of damage and leakage of the heat exchange component to a certain extent.

[0010] In some embodiments, the current collector includes a current collecting body, the connecting member is connected to the current collecting body, the current collecting body is provided with the current collecting space, and the current collecting body is configured as a flexible structure.

[0011] In this embodiment, by setting the current collecting body as a flexible structure and connecting it to the adapter through the current collecting body, it is helpful to absorb the assembly process differences between the connecting piece and the current collecting body, and between the adapter and the current collecting body, thereby helping to improve the assembly efficiency and connection reliability between the connecting piece and the current collecting body, and between the adapter and the current collecting body.

[0012] In some embodiments, the connecting member is connected to the current collecting body by heat pressing or bonding.

[0013] Here, the connection member is connected to the current collecting body by hot pressing or bonding, and the connection method is simple and reliable.

[0014] In some embodiments, the current collecting body is connected to the adapter by heat pressing or bonding.

[0015] Here, the current collecting body and the adapter are connected by hot pressing or bonding, and the connection method is simple and reliable.

[0016] In some embodiments, the heat exchange body is configured as a rigid structure.

[0017] Here, in the embodiment where the current collecting body is configured as a flexible structure, the heat exchange body may be configured as a rigid structure, and the current collecting body is connected to the heat exchange body via a transition piece to achieve a flexible connection between the heat exchange piece and the current collector.

[0018] In some embodiments, the adapter is connected to the heat exchange body by welding, or the adapter is integrally injection molded with the heat exchange body.

[0019] In some embodiments, the current collector includes a current collecting body, the connecting member is connected to the current collecting body, the current collecting body is provided with the current collecting space, and the current collecting body is provided as a rigid structure; At least a portion of the adapter is configured as a flexible structure.

[0020] Here, in the embodiment where the current collecting body is configured as a rigid structure, at least a portion of the adapter is configured as a flexible structure, and the current collecting body is connected to the adapter to achieve a flexible connection between the heat exchange element and the current collector.

[0021] In some embodiments, the current collector includes a connector and a current collecting body, the connector is connected to the current collecting body, the current collecting body is provided with the current collecting space, the connector is provided with the liquid port, the connector is configured as a rigid structure, and the current collecting body is configured as a flexible structure.

[0022] In this embodiment, the heat exchange element can be set as a rigid structure or a flexible structure, and both structures can achieve a flexible connection between the heat exchange element and the current collector.

[0023] In some embodiments, each heat exchanger has a plurality of medium flow channels, the plurality of medium flow channels extend along a first direction of the heat exchanger, and each medium flow channel is arranged along a second direction of the heat exchanger, and the first direction intersects with the second direction.

[0024] In this embodiment, by providing a plurality of medium flow channels of each heat exchange element, heat exchange of the battery cell can be achieved through the cooperation of the current collector and the medium flow channels of the heat exchange element.

[0025] In some embodiments, the flexible structure includes a metal plasticized film.

[0026] In this embodiment, since the metal plastic film is thin and light in weight, and a medium flow channel is formed between at least two metal plastic films, it is not affected by the extrusion process and does not need to meet a large thickness requirement, so the thickness and weight of the heat exchange component as a whole can be reduced. At the same time, since the heat exchange component has the characteristics of insulation, the risk of insulation failure can be avoided. The heat exchange component will not react with the heat exchange medium flowing inside, so there is no risk of corrosion and leakage.

[0027] In some embodiments, the flexible structure includes an aluminum-plastic film.

[0028] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0029] In some embodiments, the current collector includes a first current collector and a second current collector, the first current collector is provided with a first current collecting space and a first liquid outlet and a second liquid outlet connected to the first current collecting space, the second current collector is provided with a second current collecting space and a third liquid outlet and a fourth liquid outlet connected to the second current collecting space, the first current collector and the second current collector are respectively arranged at both ends of the heat exchange component along the extension direction, and the first current collecting space and the second current collecting space are connected to the medium flow channel.

[0030] The first current collector and the second current collector are respectively disposed at a first end and a second end in the length direction of the heat exchange member.

[0031] One end port of the medium flow channel of the heat exchange element is communicated with the first flow collecting space, and the other end port of the medium flow channel is communicated with the second flow collecting space.

[0032] In some embodiments, there are multiple heat exchange components, each of which is arranged side by side and spaced apart, and adjacent heat exchange components are connected through the liquid port.

[0033] The heat exchange components are arranged side by side and spaced apart so that there is a certain gap between two adjacent heat exchange components for placing battery cells, so that the heat exchange components and the battery cells are close to each other, which is beneficial to improving the heat exchange efficiency.

[0034] In some embodiments, the heat exchange assembly is disposed between the battery cells.

[0035] Here, the heat exchange system is provided with a plurality of heat exchange components, and at least part of the battery cells are provided in the gap between two adjacent heat exchange components. Such an arrangement can improve the heat exchange efficiency of the battery cells.

[0036] In some embodiments, the battery cell includes multiple side surfaces, the multiple side surfaces include a first side surface, and the first side surface is a side surface with the largest area among the multiple side surfaces, wherein the heat exchange assembly is located on one side of the first side surface of the battery cell.

[0037] That is to say, the heat exchange assembly is in contact with the largest first side surface of the battery cell, so that the contact area between the heat exchange assembly and the battery cell can be increased, thereby improving the heat exchange effect on the battery cell.

[0038] A second aspect of the embodiment of the present application provides a heat exchange assembly, the heat exchange assembly comprising a heat exchange element and a current collector, the heat exchange element having at least one medium flow channel therein, the at least one medium flow channel being used to conduct a heat exchange medium, the heat exchange medium being used to exchange heat with a battery cell, the current collector being provided with a flow collection space and a liquid port communicating with the flow collection space, the flow collection space being communicated with at least part of the medium flow channel; At least part of the heat exchange element and / or at least part of the current collector is configured as a rigid structure, and at least part of the heat exchange element and / or at least part of the current collector is configured as a flexible structure, so that the heat exchange element is flexibly connected to the current collector, and the elastic modulus of the rigid structure is greater than the elastic modulus of the flexible structure; Wherein, the heat exchange element comprises a heat exchange body, the heat exchange body is configured as a rigid structure, and the medium flow channel is formed inside the heat exchange body.

[0039] The heat exchange assembly provided in the embodiment of the present application is used to exchange heat with a battery cell. By setting at least part of the heat exchange element and / or at least part of the current collector as a flexible structure, the heat exchange element is flexibly connected to the current collector. That is to say, at least part of the current collector and the heat exchange element are connected in a manner that can cause axial expansion and contraction, folding, and a certain amount of vertical axial displacement. In this way, when the heat exchange element or the current collector is collided or squeezed by an external force, the heat exchange element and the current collector can be deformed through the flexible connection structure, which can improve the situation of damage and leakage of the heat exchange assembly to a certain extent, thereby helping to improve the reliability of the heat exchange assembly. In addition, the flexible connection structure between the heat exchange element and the current collector is also conducive to absorbing the assembly tolerance between the heat exchange element and the current collector, thereby helping to improve the assembly efficiency and connection reliability between the heat exchange element and the current collector, and between the heat exchange element and the box.

[0040] A third aspect of the embodiments of the present application provides an electrical device, comprising the battery device or the heat exchange assembly described above.

[0041] The battery device of the electric device provided in the embodiment of the present application includes a box, a heat exchange assembly and a plurality of battery cells, wherein the plurality of battery cells are arranged in the box, and the box plays a protective role on the battery cells. The heat exchange assembly is used to exchange heat with the battery cells, and the heat exchange assembly is flexibly connected to the current collector by setting at least part of the heat exchange element and / or at least part of the current collector as a flexible structure, that is, at least part of the current collector and the heat exchange element are connected in a manner that can cause axial expansion and contraction, folding and a certain amount of vertical axial displacement. In this way, when the heat exchange element or the current collector is collided or squeezed by external force, the heat exchange element and the current collector can be deformed through the flexible connection structure, which can improve the situation of damage and leakage of the heat exchange assembly to a certain extent, thereby helping to improve the reliability of the heat exchange assembly. In addition, the flexible connection structure between the heat exchange element and the current collector is also conducive to absorbing the assembly tolerance between the heat exchange element and the current collector, thereby helping to improve the assembly efficiency and connection reliability between the heat exchange element and the current collector, and between the heat exchange assembly and the box. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic diagram of the structure of a vehicle provided in one embodiment of the present disclosure; Figure 2 A three-dimensional exploded schematic diagram of a battery device provided in one embodiment of the present disclosure; Figure 3 A schematic diagram of assembling a heat exchange component and a battery cell according to an embodiment of the present disclosure; Figure 4 A schematic diagram of the structure of a heat exchange assembly provided in one embodiment of the present disclosure; Figure 5 A three-dimensional exploded schematic diagram of a heat exchange assembly provided in one embodiment of the present disclosure; Figure 6 A schematic diagram of a partial structure of a heat exchange assembly provided in the first embodiment of the present disclosure; Figure 7 for Figure 6 Sectional view in the AA direction; Figure 8 A schematic diagram of a partial structure of a heat exchange assembly provided in a second embodiment of the present disclosure; Fig. 9 for Figure 8 Cross-sectional view in the BB direction; Fig.10 A schematic diagram of a partial structure of a heat exchange assembly provided in a third embodiment of the present disclosure; Fig.11 for Fig.10 Enlarged view of point C in the middle.

[0043] Description of Reference Numerals 10. Battery cell; 11. First side; 20. Box; 21. First box portion; 22. Second box portion; 23. Accommodating chamber; 30. Heat exchange assembly; 31. Heat exchange element; 311. Heat exchange body; 312. Adapter; 3121. First adapter; 3122. Second adapter; 313. Medium flow channel; 32. Current collector; 321. Current collector body; 322. Connector; 323. Current collecting space; 324. Liquid outlet; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. DETAILED DESCRIPTION

[0044] If not otherwise specified, all embodiments and optional embodiments of the present disclosure may be combined with each other to form a new technical solution.

[0045] Unless otherwise specified, all technical features and optional technical features of the present disclosure can be combined with each other to form a new technical solution.

[0046] With the development of clean energy, more and more devices use electric energy as driving energy, and then power batteries that can store more electric energy and can be charged and discharged repeatedly are developing rapidly, such as lithium-ion batteries. Among them, power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields.

[0047] In the embodiment of the present disclosure, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0048] The battery cells may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., but the embodiments of the present disclosure are not limited thereto.

[0049] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, which is arranged between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0050] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

[0051] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0052] In some embodiments, the electrode assembly is a laminate structure.

[0053] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0054] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0055] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0056] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0057] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0058] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0059] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0060] In some embodiments, the battery cell may include a shell. The shell may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film. In some embodiments, the shell may be a sealed structure or a non-sealed structure. As an example, when the shell is a non-sealed structure, the shell plays a role in protecting the electrode assembly, and a sealed bag is also included between the shell and the electrode assembly, and the sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag may be a bag-shaped insulating member or an aluminum-plastic film. When the shell is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0061] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no particular limitation in the present disclosure.

[0062] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap is provided to cover the opening. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0063] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through a current collecting member. The electrode terminal may be disposed on an end cap, or may be disposed on the housing.

[0064] In some embodiments, the energy storage equipment includes an energy storage container, an energy storage cabinet, etc.

[0065] Power stations have increasingly higher requirements for the area energy density of energy storage containers. Therefore, in order to increase the amount of electricity, the weight of the container will also increase accordingly. However, containers need to be transported from the production site to the use site by land and / or sea transportation. Usually, there are weight limits for land and sea transportation, so there is a contradiction between the increase in energy density and the weight of energy storage containers.

[0066] During the use of the battery device, the battery cells in the battery device will generate heat. If the heat is too high, it will have an adverse effect on the performance and service life of the battery device. Therefore, how to effectively dissipate the heat of the battery cells of the battery device while improving the reliability of the heat exchange component has become an important research direction in this field. In the related art, the battery cells in the battery device are cooled by setting a cooling system in the battery device box. The above-mentioned cooling system may include a plurality of harmonica tube cold plates laid in the battery device box, and the surfaces of the plurality of harmonica tube cold plates are in contact with the surfaces of the battery cells in the battery device. The harmonica tube cold plates can be set on the large surface of the battery cells, for example. During use, a heat exchange medium such as water flows through the above-mentioned plurality of harmonica tube cold plates, thereby taking away the heat from the battery cells and cooling the battery cells. However, the harmonica tube cold plates and the current collectors in the above-mentioned cooling system are both rigid parts, and the harmonica tube cold plates and the current collectors are rigidly connected. When the harmonica tube cold plates are hit or squeezed from the side, there is damage and leakage, resulting in insulation withstand voltage failure and thermal runaway, thereby reducing the reliability of the heat exchange component.

[0067] In view of this, in order to improve the reliability of the heat exchange component, an embodiment of the present disclosure provides a battery device, which includes a housing, a heat exchange component and a plurality of battery cells. The plurality of battery cells are arranged in the housing. The heat exchange component includes a heat exchange element and a current collector. The heat exchange element has at least one medium flow channel inside, and the at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with a plurality of battery cells. The current collector is provided with a current collecting space and a liquid port connected to the current collecting space, and the current collecting space is connected to at least part of the medium flow channel. At least part of the heat exchange element and / or at least part of the current collector is set as a rigid structure, and at least part of the heat exchange element and / or at least part of the current collector is set as a flexible structure, so that the heat exchange element is flexibly connected to the current collector. The elastic modulus of the rigid structure is greater than the elastic modulus of the flexible structure. Among them, the heat exchange element includes a heat exchange body, the heat exchange body is set as a rigid structure, and a medium flow channel is formed inside the heat exchange body.

[0068] The battery device provided in the embodiment of the present application includes a housing, a heat exchange assembly and a plurality of battery cells, wherein the plurality of battery cells are arranged in the housing, and the housing plays a protective role on the battery cells. The heat exchange assembly is used to exchange heat with the battery cells, and the heat exchange assembly is flexibly connected to the current collector by setting at least part of the heat exchange element and / or at least part of the current collector as a flexible structure, that is, at least part of the current collector and the heat exchange element are connected in a manner that can cause axial expansion and contraction, folding and a certain amount of vertical axial displacement. In this way, when the heat exchange element or the current collector is collided or squeezed by an external force, the heat exchange element and the current collector can be deformed through the flexible connection structure, which can improve the situation of damage and leakage of the heat exchange assembly to a certain extent, thereby helping to improve the reliability of the heat exchange assembly. In addition, the flexible connection structure between the heat exchange element and the current collector is also conducive to absorbing the assembly tolerance between the heat exchange element and the current collector, thereby helping to improve the assembly efficiency and connection reliability between the heat exchange element and the current collector, and between the heat exchange assembly and the housing.

[0069] The technical solution described in the embodiments of the present disclosure is applicable to an electric device using a battery device. The electric device includes a battery device in any embodiment of the present disclosure, and the battery device is used to provide electric energy.

[0070] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present disclosure do not impose any special restrictions on the above-mentioned electrical devices.

[0071] It should be noted that the technical solutions described in the embodiments of the present disclosure are not limited to the battery devices described above, but can also be applied to all electrical devices and energy storage devices including battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0072] Please refer to Figure 1 , a controller 200, a motor 300 and a battery device 100 may be disposed inside the vehicle 1000, and the controller 200 is used to control the battery device 100 to power the motor 300. For example, the battery device 100 may be disposed at the bottom, front, or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the start-up, navigation, and operation of the vehicle 1000. In another embodiment of the present disclosure, the battery device 100 may not only be used as an operating power source for the vehicle 1000, but may also be used as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0073] See also Figure 2In order to meet different power requirements, the battery device 100 includes a plurality of battery cells 10, which refer to the smallest unit that constitutes a battery module or a battery pack. A plurality of battery cells 10 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a plurality of battery cells 10 that are both connected in series and in parallel. A plurality of battery cells 10 can be directly connected in series, in parallel, or in a hybrid connection, and then the whole formed by the plurality of battery cells 10 is accommodated in the box 20; of course, the battery device 100 can also be a plurality of battery cells 10 that are first connected in series, in parallel, or in a hybrid connection to form a battery module, and then the plurality of battery modules are connected in series, in parallel, or in a hybrid connection to form a whole, and are accommodated in the box 20. The battery device 100 can also include other structures. For example, the battery device 100 can also include a confluence component for realizing electrical connection between the plurality of battery cells 10. Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 10 can be cylindrical, flat, rectangular, or in other shapes.

[0074] See also Figures 2 to 11 The embodiment of the present disclosure provides a battery device 100, which includes a housing 20, a heat exchange assembly 30 and a plurality of battery cells 10. The plurality of battery cells 10 are arranged in the housing 20. The heat exchange assembly 30 includes a heat exchange member 31 and a current collector 32. The heat exchange member 31 has at least one medium flow channel 313 inside, and the at least one medium flow channel 313 is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the plurality of battery cells 10. The current collector 32 is provided with a current collecting space 323 and a liquid port 324 connected to the current collecting space 323, and the current collecting space 323 is connected to at least part of the medium flow channel 313. At least part of the heat exchange member 31 and / or at least part of the current collector 32 is set as a rigid structure. At least part of the heat exchange member 31 and / or at least part of the current collector 32 is set as a flexible structure, so that the heat exchange member 31 is flexibly connected to the current collector 32. The elastic modulus of the rigid structure is greater than the elastic modulus of the flexible structure. The heat exchange element 31 includes a heat exchange body 311 . The heat exchange body 311 is configured as a rigid structure, and a medium flow channel 313 is formed inside the heat exchange body 311 .

[0075] The multiple mentioned in the embodiments of the present application refers to a number of two or more.

[0076] Please refer to Figure 2 The battery device 100 includes a housing 20 and a plurality of battery cells 10 , wherein the plurality of battery cells 10 are disposed in the housing 20 .

[0077] The box 20 can be a simple three-dimensional structure such as a single cuboid, a cylinder or a sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders or spheres. The material of the box 20 can be alloy materials such as aluminum alloy, iron alloy, etc., or polymer materials such as polycarbonate, polyisocyanurate foam plastics, or composite materials such as glass fiber and epoxy resin.

[0078] The box body 20 is used to encapsulate the battery cell 10 , and the box body 20 can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cell 10 .

[0079] For example, the box 20 is generally a rectangular parallelepiped structure, the length direction and width direction of the box 20 are parallel to the horizontal plane, and the length direction of the box 20 is parallel to the longest side of the rectangular parallelepiped structure of the box 20. The height direction of the box 20 is perpendicular to the ground. For example, Figure 2 As shown, the length direction of the box body 20 is represented by X, the width direction of the box body 20 is represented by Y, and the height direction of the box body 20 is represented by Z.

[0080] See also Figures 2 to 11 The embodiment of the present disclosure provides a heat exchange assembly 30, which includes a heat exchange member 31 and a current collector 32. The heat exchange member 31 has at least one medium flow channel 313 inside, and at least one medium flow channel 313 is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with a plurality of battery cells 10. The current collector 32 is provided with a current collecting space 323 and a liquid port 324 connected to the current collecting space 323, and the current collecting space 323 is connected to at least part of the medium flow channel 313. At least part of the heat exchange member 31 and / or at least part of the current collector 32 is configured as a flexible structure so that the heat exchange member 31 is flexibly connected to the current collector 32.

[0081] It should be noted that the specific type of heat exchange medium is not limited here, as long as it can have a heat exchange effect on the battery cell 10, for example, it can be gaseous or liquid. In the embodiment of the present disclosure, the heat exchange medium is described as a cooling liquid.

[0082] Exemplarily, the heat exchange component 30 further includes an inlet and an outlet, and both the inlet and the outlet are in communication with the medium flow channel 313 .

[0083] Here, the inlet and outlet of the heat exchange assembly 30 are used to be connected to the pipelines of the air conditioning system or the water tank or other liquid storage devices of the vehicle or electrical equipment.

[0084] It should be noted that the specific number of the medium flow channels 313 is not limited here, and can be one or more.

[0085] The principle of heat exchange of the heat exchange component 30 for the battery cell 10 is as follows: the heat exchange medium output by the heat exchange medium source (not shown) enters the medium flow channel 313 through the inlet of the heat exchange component 30, and after the heat exchange medium exchanges heat with the battery cell 10, the heat exchange medium flows out through the outlet of the heat exchange component 30, completing the heat exchange of the battery cell 10.

[0086] Here, the heat exchange component 30 exchanging heat with the battery cell 10 may be to dissipate heat from the battery cell 10 or to heat the battery cell 10 .

[0087] The box 20 is used to accommodate the battery cell 10, and the box 20 can be of various structures. Figure 2 The box body 20 includes a box body, and the box body may include a first box body portion 21 and a second box body portion 22 . The first box body portion 21 and the second box body portion 22 cover each other to define an accommodation space for accommodating the battery cell 10 .

[0088] Of course, the first box body 21 and the second box body 22 can be in various shapes, such as a cylinder, a cuboid, etc.

[0089] In order to improve the sealing performance after the first box body 21 and the second box body 22 are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 21 and the second box body 22 .

[0090] Assuming that the first box body portion 21 covers the top of the second box body portion 22 , the first box body portion 21 can also be referred to as an upper box cover, and the second box body portion 22 can also be referred to as a lower box cover.

[0091] Exemplarily, the battery device 100 further includes a bottom guard plate, which is disposed on a side of the heat exchange assembly 30 facing away from the battery cell 10 .

[0092] Here, by arranging the bottom guard plate on the side of the heat exchange assembly 30 away from the battery cell 10, it can be used to protect the heat exchange assembly 30 and the box body 20, reduce the impact of foreign objects on the box body 20 during driving, and improve the reliability of the battery device 100.

[0093] Exemplarily, the heat exchange element 31 includes a harmonica tube sheet.

[0094] A plurality of medium flow channels 313 extending along the length direction of the harmonica tube plate are formed inside the harmonica tube plate. The plurality of medium flow channels 313 are arranged along the height direction of the harmonica tube plate for allowing heat exchange medium to flow through.

[0095] The specific molding method of the harmonica tube plate is not limited here, for example, it can be formed by extrusion molding, die casting molding or injection molding.

[0096] At least part of the heat exchange element 31 and / or at least part of the current collector 32 is set as a flexible structure means that at least part of the heat exchange element 31 can be set as a flexible structure, at least part of the current collector 32 can be set as a flexible structure, or at least part of the heat exchange element 31 and at least part of the current collector 32 can be set as a flexible structure.

[0097] At least part of the heat exchange element 31 is set as a flexible structure, which means that part of the heat exchange element 31 can be set as a flexible structure; or all of the heat exchange element 31 can be set as a flexible structure.

[0098] At least part of the current collector 32 is configured as a flexible structure. This means that part of the current collector 32 may be configured as a flexible structure; or all of the current collector 32 may be configured as a flexible structure.

[0099] Here, the heat exchange element 31 and the current collector 32 are flexibly connected, which means that the heat exchange element 31 and the current collector 32 are connected in a manner that allows axial expansion and contraction, folding, and a certain amount of vertical displacement.

[0100] Here, the flexible structure can be a material property of the heat exchanger 31 and / or the current collector 32. This type of property can be a property given to the material due to its light weight, or a property given to the material due to at least one of its thickness, stiffness, strength, elastic modulus, etc. As an example, the material of the flexible structure can be selected to be a material with a lighter weight than conventional aluminum plates, steel plates, etc., and its flexibility can be controlled by the thickness, width, length, and type of material of the flexible structure. Of course, it can also be a structural property of the flexible structure, such as a property given to the flexible structure by thinning the local structure of the flexible structure.

[0101] The battery device 100 provided in the embodiment of the present application includes a box 20, a heat exchange assembly 30 and a plurality of battery cells 10, wherein the plurality of battery cells 10 are arranged in the box 20, and the box 20 protects the battery cells 10. The heat exchange assembly 30 is used to exchange heat with the battery cells 10, and at least part of the heat exchange element 31 and / or at least part of the current collector 32 are set as a flexible structure, so that the heat exchange element 31 is flexibly connected to the current collector 32, that is, at least part of the current collector 32 and the heat exchange element 31 are connected in a manner that can be axially extended, folded, and vertically displaced to a certain extent. In this way, when the heat exchange element 31 or the current collector 32 is collided or squeezed by an external force, the heat exchange element 31 and the current collector 32 can be deformed through the flexible connection structure, which can improve the situation of damage and leakage of the heat exchange assembly 30 to a certain extent, thereby helping to improve the reliability of the heat exchange assembly 30. In addition, the flexible connection structure between the heat exchanger 31 and the current collector 32 is also beneficial to absorb the assembly tolerance between the heat exchanger 31 and the current collector 32, thereby helping to improve the assembly efficiency and connection reliability between the heat exchanger 31 and the current collector 32, and the heat exchange assembly 30 and the box body 20.

[0102] In some embodiments, see Figures 4 to 5 The current collector 32 includes a first current collector and a second current collector. The first current collector is provided with a first current collecting space and a first liquid outlet and a second liquid outlet connected to the first current collecting space. The second current collector is provided with a second current collecting space and a third liquid outlet and a fourth liquid outlet connected to the second current collecting space. The first current collector and the second current collector are respectively arranged at both ends of the heat exchange member 31 along the extension direction, and the first current collecting space and the second current collecting space are connected to the medium flow channel 313.

[0103] The first current collector and the second current collector are respectively disposed at a first end and a second end in the length direction of the heat exchange element 31 .

[0104] Exemplarily, the first current collector includes a first shell having a first current collecting space therein, and a side of the first shell facing the heat exchange element 31 is open for connecting to a first end of the heat exchange element 31 .

[0105] Exemplarily, the second current collector includes a second shell having a second current collecting space therein, and a side of the second shell facing the heat exchange element 31 is open for connecting to the second end of the heat exchange element 31 .

[0106] One end port of the medium flow channel 313 of the heat exchange element 31 is communicated with the first flow collecting space, and the other end port of the medium flow channel 313 is communicated with the second flow collecting space.

[0107] In some embodiments, the first current collector and the second current collector are of the same size and shape, and are symmetrically arranged at both ends of the heat exchange element 31 in the length direction.

[0108] For example, see Figures 3 to 6 In some embodiments, the first liquid passage opening and the second liquid passage opening are disposed on both sides of the first current collector in the thickness direction of the heat exchange element 31. In this way, it is advantageous to assemble a plurality of heat exchange elements 31 in parallel and at intervals.

[0109] Of course, in other embodiments, the first liquid passage opening and the second liquid passage opening may also be disposed on the end of the first current collector away from the heat exchange element 31. The first liquid passage opening and the second liquid passage opening are arranged along the height direction of the first current collector.

[0110] For example, see Figures 3 to 6 In some embodiments, the third liquid outlet and the fourth liquid outlet are arranged on both sides of the second current collector in the thickness direction of the heat exchange element 31. In this way, it is beneficial to assemble multiple heat exchange elements 31 in parallel and at intervals.

[0111] Of course, in other embodiments, the third liquid port and the fourth liquid port may also be disposed on the end of the second current collector away from the heat exchange element 31. The third liquid port and the fourth liquid port are arranged along the height direction of the second current collector.

[0112] In some embodiments, see Figures 5 to 11 The heat exchange element 31 includes a heat exchange body 311 and an adapter 312 . The heat exchange body 311 is connected to the current collector 32 through the adapter 312 . A medium flow channel 313 is formed inside the heat exchange body 311 .

[0113] Exemplarily, the adapter 312 is, for example, an adapter ring, and the two ends of the connector 322 along the extension direction of the heat exchanger 31 are respectively connected to the heat exchange body 311 and the current collector 32 to achieve connection between the heat exchanger 31 and the current collector 32 .

[0114] The provision of the adapter 312 facilitates the connection between the heat exchange element 31 and the current collector 32, thereby improving assembly efficiency and connection reliability.

[0115] For example, when the heat exchange body 311 and the current collector 32 are both rigid structures, the adapter 312 can be set as a flexible structure to achieve a flexible connection between the heat exchange element 31 and the current collector 32.

[0116] In some embodiments, see Figures 4 to 7 The current collector 32 includes a connector 322 , and the connector 322 is provided with a liquid outlet 324 . The connector 322 is configured as a rigid structure, and the elastic modulus of the rigid structure is greater than the elastic modulus of the flexible structure.

[0117] Exemplarily, the connecting member 322 includes a first connecting member and a second connecting member, and the liquid outlet 324 includes a first liquid outlet, a second liquid outlet, a third liquid outlet and a fourth liquid outlet. The first connecting member is provided with the first liquid outlet and the second liquid outlet, and the second connecting member is provided with the third liquid outlet and the fourth liquid outlet.

[0118] Here, the connecting member 322 can be a metal member or a plastic member, etc., and the specific material is not limited here.

[0119] The connector 322 is configured as a rigid structure, that is, the elastic modulus of the connector 322 is greater than the elastic modulus of the flexible structure. On the one hand, the connector 322 can have sufficient structural strength. On the other hand, the heat exchange component 31 and the current collector 32 can be deformed through the flexible connection structure, which can improve the situation of damage and leakage of the heat exchange component 30 to a certain extent.

[0120] Here, by setting the connecting member 322 as a rigid structure, it is helpful to improve the connection reliability and connection stability of the connecting member 322.

[0121] In some embodiments, see Figure 5 The current collector 32 includes a current collecting body 321 , a connecting member 322 is connected to the current collecting body 321 , the current collecting body 321 is provided with a current collecting space 323 , and the current collecting body 321 is provided as a flexible structure.

[0122] That is to say, the connection between the connecting piece 322 and the current collecting body 321 is capable of axial expansion and contraction, folding and a certain amount of vertical axial displacement, and the connection between the adapter 312 and the current collecting body 321 is also capable of axial expansion and contraction, folding and a certain amount of vertical axial displacement.

[0123] In this embodiment, by setting the current collecting body 321 as a flexible structure and connecting it to the adapter 312 through the current collecting body 321, it is beneficial to absorb the assembly process differences between the connecting piece 322 and the current collecting body 321, and between the adapter 312 and the current collecting body 321, thereby helping to improve the assembly efficiency and connection reliability between the connecting piece 322 and the current collecting body 321, and between the adapter 312 and the current collecting body 321.

[0124] In some embodiments, see Figure 5 The connecting piece 322 is connected to the current collecting body 321 by hot pressing or bonding.

[0125] Exemplarily, the surfaces of the connection member 322 and the current collecting body 321 that are close to each other are connected by heat pressing or bonding.

[0126] Here, the connection member 322 is connected to the current collecting body 321 by heat pressing or bonding, and the connection method is simple and reliable.

[0127] In some embodiments, see Figure 5 , the adapter 312 is configured as a rigid structure.

[0128] Here, in the embodiment where the current collecting body 321 is configured as a flexible structure, the adapter 312 may be configured as a rigid structure, and the current collecting body 321 is connected to the adapter 312 to achieve a flexible connection between the heat exchange element 31 and the current collector 32 .

[0129] In some other embodiments, the adapter 312 may also be configured as a flexible structure.

[0130] Here, in the embodiment where the current collecting body 321 is configured as a flexible structure, the adapter 312 may also be configured as a flexible structure, and the current collecting body 321 is connected to the adapter 312 to achieve a flexible connection between the heat exchange element 31 and the current collector 32 .

[0131] In some embodiments, see Figure 5 The current collecting body 321 is connected to the adapter 312 by hot pressing or bonding.

[0132] Exemplarily, the surfaces of the current collecting body 321 and the adapter 312 that are close to each other are connected by heat pressing or bonding.

[0133] Here, the current collecting body 321 and the adapter 312 are connected by heat pressing or bonding, and the connection method is simple and reliable.

[0134] In some embodiments, see Figures 4 to 11 , the heat exchange body 311 is configured as a rigid structure.

[0135] Here, in the embodiment where the current collecting body 321 is configured as a flexible structure, the heat exchange body 311 may be configured as a rigid structure, and the current collecting body 321 is connected to the heat exchange body 311 via the adapter 312 to achieve a flexible connection between the heat exchange element 31 and the current collector 32 .

[0136] In some other embodiments, the heat exchange body 311 may also be configured as a flexible structure.

[0137] Here, in the embodiment where the current collecting body 321 is configured as a flexible structure, the heat exchange body 311 may also be configured as a flexible structure, and the current collecting body 321 is connected to the heat exchange body 311 via the adapter 312 to achieve a flexible connection between the heat exchange element 31 and the current collector 32 .

[0138] In some embodiments, see Figures 5 to 9 The adapter 312 is welded to the heat exchange body 311 , or the adapter 312 is integrally injection molded on the heat exchange body 311 .

[0139] Here, the adapter 312 and the heat exchange body 311 can be an integrated structure, which is helpful to reduce parts and improve assembly efficiency.

[0140] Exemplarily, the adapter 312 is integrally injection-molded with the heat exchange body 311 .

[0141] Of course, the adapter 312 and the heat exchange body 311 may also be integrally injection molded.

[0142] The adapter 312 and the heat exchange body 311 may also be a split structure, which is helpful to reduce the difficulty of molding.

[0143] In some embodiments, see Figures 5 to 9 The current collector 32 includes a current collector body 321, a connecting member 322 connected to the current collector body 321, and a current collecting space 323 provided in the current collector body 321. The current collector body 321 is configured as a rigid structure, and at least a portion of the adapter 312 is configured as a flexible structure.

[0144] Part of the structure of the adapter 312 may be set as a flexible structure, and another part of the structure may be set as a rigid structure, or the entirety of the adapter 312 may be set as a flexible structure.

[0145] For example, see Figure 10 to Figure 11 The adapter 312 includes a first adapter 3121 and a second adapter 3122 connected to each other. The first adapter 3121 is set as a flexible structure, and the second adapter 3122 is set as a rigid structure. The first adapter 3121 is connected to the collector 32, and the second adapter 3122 is connected to the heat exchange body 311.

[0146] Here, in the embodiment where the current collecting body 321 is configured as a rigid structure, at least a portion of the adapter 312 is configured as a flexible structure, and the current collecting body 321 is connected to the adapter 312 to achieve a flexible connection between the heat exchange element 31 and the current collector 32 .

[0147] In some other embodiments, please refer to Figures 5 to 9 The current collector 32 includes a current collector body 321, a connecting member 322 connected to the current collector body 321, and a current collecting space 323 provided in the current collector body 321. The current collector body 321 is configured as a rigid structure, the adapter 312 is configured as a rigid structure, and the heat exchange body 311 is configured as a flexible structure.

[0148] Here, in an embodiment where both the current collecting body 321 and the adapter 312 are configured as rigid structures, by configuring the heat exchange body 311 as a flexible structure, the current collecting body 321 is connected to the heat exchange body 311 via the adapter 312 to achieve a flexible connection between the heat exchange element 31 and the current collector 32 .

[0149] In some embodiments, please refer to Figures 5 to 9 The current collector 32 includes a connector 322 and a current collector body 321, the connector 322 is connected to the current collector body 321, the current collector body 321 is provided with a current collecting space 323, and the connector 322 is provided with a liquid outlet 324. The connector 322 is configured as a rigid structure, and the current collector body 321 is configured as a flexible structure, and the elastic modulus of the rigid structure is greater than the elastic modulus of the flexible structure.

[0150] In this embodiment, the heat exchange element 31 can be set as a rigid structure or a flexible structure, and both structures can achieve a flexible connection between the heat exchange element 31 and the current collector 32.

[0151] In some embodiments, the flexible structure includes a metal plasticized film.

[0152] The flexible structure is a single-layer or multi-layer film.

[0153] Here, the metal-plasticized film is a metal-plastic composite material, that is, it includes a metal layer and a plastic layer.

[0154] In this embodiment, since the metal plastic film is thin and light in weight, and the medium flow channel 313 is formed between at least two metal plastic films, it is not affected by the extrusion process and does not need to meet the larger thickness requirement, so the overall thickness and weight of the heat exchange component 30 can be reduced. At the same time, since the heat exchange component 30 has the characteristics of insulation, the risk of insulation failure can be avoided. The heat exchange component 30 will not react with the heat exchange medium flowing inside, so there is no risk of corrosion and leakage.

[0155] Exemplarily, at least two flexible structures are configured as aluminum-plastic films.

[0156] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0157] In some embodiments, see Figure 3 Each heat exchanger 31 has a plurality of medium flow channels 313 , and the plurality of medium flow channels 313 extend along a first direction of the heat exchanger 31 . The medium flow channels 313 are arranged along a second direction of the heat exchanger 31 , and the first direction intersects the second direction.

[0158] For example, the first direction may be the extending direction of the heat exchange element 31 (eg Figure 2 The second direction may be the height direction of the heat exchange element 31 (eg Figure 2 direction).

[0159] In this embodiment, by providing a plurality of medium flow channels 313 of each heat exchange element 31 , heat exchange of the battery cell 10 can be achieved through the cooperation between the current collector 32 and each medium flow channel 313 of the heat exchange element 31 .

[0160] In some embodiments, see Figure 2 There are multiple heat exchange components 30 , and each heat exchange component 30 is arranged side by side and spaced apart. Adjacent heat exchange components 30 are connected through liquid ports 324 .

[0161] Here, the heat exchange components 30 may be arranged at intervals along the length direction of the box body 20 , or may be arranged at intervals along the width direction of the box body 20 .

[0162] Adjacent heat exchange components 30 are connected via the liquid ports 324 , that is, a plurality of heat exchange components 30 may form a heat exchange system, or all heat exchange components 30 may form a heat exchange system.

[0163] The heat exchange assemblies 30 are arranged side by side and spaced apart so that there is a certain gap between two adjacent heat exchange assemblies 30 for placing the battery cells 10 so that the heat exchange assemblies 30 are close to the battery cells 10, which is beneficial to improving the heat exchange efficiency.

[0164] In some embodiments, see Figure 2 The heat exchange assembly 30 is disposed between each battery cell 10 .

[0165] The heat exchange assembly 30 is arranged between each battery cell 10, that is to say, at least some of the battery cells 10 are arranged in the gap between two adjacent heat exchange assemblies 30. Here, at least some of the battery cells 10 are arranged in the gap between two adjacent heat exchange assemblies 30, which means that all of the battery cells 10 can be arranged in the gap between two adjacent heat exchange assemblies 30, that is, all of the battery cells 10 have opposite sides that are in contact with the heat exchange assembly 30, so as to achieve cooling of the two sides of the battery cells 10. Alternatively, some of the battery cells 10 can be arranged in the gap between two adjacent heat exchange assemblies 30, and the other part of the battery cells 10 can have only one side in contact with the heat exchange assembly 30.

[0166] Here, the heat exchange system is provided with a plurality of heat exchange components 30 , and at least part of the battery cells 10 are provided in the gap between two adjacent heat exchange components 30 . Such a configuration can improve the heat exchange efficiency of the battery cells 10 .

[0167] In some embodiments, see Figure 2 and Figure 3 The battery cell 10 includes multiple side surfaces, including a first side surface 11 , which is a side surface with the largest area among the multiple side surfaces, wherein the heat exchange assembly 30 is located on one side of the first side surface 11 of the battery cell 10 .

[0168] It should be noted that the first side surface 11 described in the embodiment of the present application is the large surface of the battery cell 10 , which is the surface with the largest area among the multiple surfaces of the battery cell 10 .

[0169] Taking the square battery cell 10 as an example, in the vertical state, the surface formed by the length and width directions of the battery cell 10 is the bottom surface of the battery cell 10, the surface formed by the length and height directions of the battery cell 10 is the large surface of the battery cell 10, and the surface formed by the width and height directions of the battery cell 10 is the side surface of the battery cell 10.

[0170] Here, the heat exchange assembly 30 may be disposed on one side of one of the first side surfaces 11 of the battery cell 10 , or the heat exchange assembly 30 may be disposed on one side of both first side surfaces 11 of the battery cell 10 .

[0171] The size of the first side surface 11 of the battery cell 10 abutting against the heat exchange assembly 30 is not less than the size of the other side surfaces of the battery cell 10, that is, the size of the first side surface 11 of the battery cell 10 abutting against the heat exchange assembly 30 is greater than or equal to the size of the other side surfaces of the battery cell 10. In other words, the heat exchange assembly 30 abuts against the largest first side surface 11 of the battery cell 10, so that the contact area between the heat exchange assembly 30 and the battery cell 10 can be increased, thereby improving the heat exchange effect on the battery cell 10.

[0172] In the description of the present disclosure, the descriptions with reference to the terms "in one embodiment", "in some embodiments", "in other embodiments", "in yet other embodiments", or "exemplary" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present disclosure. In the present disclosure, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine different embodiments or examples described in the present disclosure and features of different embodiments or examples, unless they are contradictory.

[0173] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: Box; A plurality of battery cells, wherein the plurality of battery cells are arranged in the box; A heat exchange assembly, the heat exchange assembly comprising a heat exchange element and a current collector, the heat exchange element having at least one medium flow channel therein, the at least one medium flow channel being used to conduct a heat exchange medium, the heat exchange medium being used to exchange heat with the plurality of battery cells, the current collector being provided with a flow collection space and a liquid port communicating with the flow collection space, the flow collection space being communicated with at least part of the medium flow channel; At least part of the heat exchange element and / or at least part of the current collector is configured as a rigid structure, and at least part of the heat exchange element and / or at least part of the current collector is configured as a flexible structure, so that the heat exchange element is flexibly connected to the current collector, and the elastic modulus of the rigid structure is greater than the elastic modulus of the flexible structure; Wherein, the heat exchange element comprises a heat exchange body, the heat exchange body is configured as a rigid structure, and the medium flow channel is formed inside the heat exchange body.

2. The battery device according to claim 1, characterized in that: The heat exchange component includes a transition piece, and the heat exchange body is connected to the current collector through the transition piece.

3. The battery device according to claim 2, characterized in that: The current collector includes a connecting member, the connecting member is provided with the liquid port, and the connecting member is configured as a rigid structure.

4. The battery device according to claim 3, characterized in that: The current collector comprises a current collecting body, the connecting member is connected to the current collecting body, the current collecting body is provided with the current collecting space, and the current collecting body is provided as a flexible structure.

5. The battery device according to claim 4, characterized in that: The connecting piece is connected to the current collecting body by hot pressing or bonding.

6. The battery device according to claim 4, characterized in that: The adapter is configured as a rigid structure.

7. The battery device according to claim 6, characterized in that: The current collecting body is connected to the adapter by heat pressing or bonding.

8. The battery device according to claim 6, characterized in that: The adapter is connected to the heat exchange body by welding, or the adapter is integrally injection-molded with the heat exchange body.

9. The battery device according to claim 3, characterized in that: The current collector comprises a current collecting body, the connecting member is connected to the current collecting body, the current collecting body is provided with the current collecting space, the current collecting body is provided as a rigid structure, and at least a part of the adapter is provided as a flexible structure.

10. The battery device according to claim 1, characterized in that: The current collector comprises a connecting piece and a current collecting body, wherein the connecting piece is connected to the current collecting body, the current collecting body is provided with the current collecting space, the connecting piece is provided with the liquid passage port, the connecting piece is provided as a rigid structure, and the current collecting body is provided as a flexible structure.

11. The battery device according to any one of claims 1 to 10, characterized in that: Each of the heat exchange elements has a plurality of medium flow channels, the plurality of medium flow channels extend along a first direction of the heat exchange element, and the medium flow channels are arranged along a second direction of the heat exchange element, and the first direction intersects with the second direction.

12. The battery device according to any one of claims 1 to 10, characterized in that: The flexible structure includes a metal plasticized film.

13. The battery device according to claim 12, characterized in that: The flexible structure comprises an aluminum-plastic film.

14. The battery device according to any one of claims 1 to 10, characterized in that: The current collector includes a first current collector and a second current collector, the first current collector is provided with a first current collecting space and a first liquid outlet and a second liquid outlet connected to the first current collecting space, the second current collector is provided with a second current collecting space and a third liquid outlet and a fourth liquid outlet connected to the second current collecting space, the first current collector and the second current collector are respectively arranged at both ends of the heat exchange component along the extension direction, and the first current collecting space and the second current collecting space are connected to the medium flow channel.

15. The battery device according to any one of claims 1 to 10, characterized in that: There are multiple heat exchange components, each of which is arranged side by side and spaced apart, and adjacent heat exchange components are connected through the liquid passage ports.

16. The battery device according to any one of claims 1 to 10, characterized in that: The heat exchange assembly is arranged between the battery cells.

17. The battery device according to claim 16, characterized in that: The battery cell includes a plurality of side surfaces, the plurality of side surfaces include a first side surface, and the first side surface is a side surface with a largest area among the plurality of side surfaces, wherein the heat exchange component is located on one side of the first side surface of the battery cell.

18. A heat exchange component, characterized in that: The heat exchange assembly includes a heat exchange element and a current collector. The heat exchange element has at least one medium flow channel inside. The at least one medium flow channel is used to conduct a heat exchange medium. The heat exchange medium is used to exchange heat with the battery cell. The current collector is provided with a flow collection space and a liquid port connected to the flow collection space. The flow collection space is connected to at least part of the medium flow channel. At least part of the heat exchange element and / or at least part of the current collector is configured as a rigid structure, and at least part of the heat exchange element and / or at least part of the current collector is configured as a flexible structure, so that the heat exchange element is flexibly connected to the current collector, and the elastic modulus of the rigid structure is greater than the elastic modulus of the flexible structure; Wherein, the heat exchange element comprises a heat exchange body, the heat exchange body is configured as a rigid structure, and the medium flow channel is formed inside the heat exchange body.

19. An electrical device, characterized in that: It comprises the battery device according to any one of claims 1 to 17 or the heat exchange component according to claim 18.

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