Battery device and electric equipment

Abstract

The embodiment of the invention provides a battery device and electric equipment. The battery device comprises a box body, a soft package battery module, a protective shell and at least one flexible part, the battery monomers are arranged in the box body, each battery monomer comprises a shell and an electrode assembly, the shell is a flexible shell, a cavity with at least one open side is formed in the protective shell, at least one battery monomer is arranged in the cavity, the flexible part and the protective shell are arranged in a stacked manner, and at least one medium flow channel is formed between the flexible part and the protective shell. In the battery device provided by the embodiment of the invention, the flexible part and the protective shell of the battery monomer are stacked to form the medium flow channel between the flexible part and the protective shell, so that the overall weight of the battery device is reduced, and the energy density is improved. And on the other hand, the flexible part has certain flexibility and can be better attached to the box body and / or the battery monomers, so that the heat exchange efficiency and the heat exchange effect are improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of battery technology, and in particular to a battery device and an electrical equipment. 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.

[0003] In the related art, the battery cells in a type of battery device are soft-pack cells. A protective shell is provided in the battery device to protect the soft-pack cells, and a cold plate is provided to exchange heat with the soft-pack cells. The weight and cost of this type of battery device are relatively high. Summary of the invention

[0004] In view of this, embodiments of the present application hope to provide a battery device and an electrical equipment.

[0005] The first aspect of an embodiment of the present application provides a battery device, which includes: a box body; a battery cell, which is arranged in the box body; the battery cell is arranged to include a shell and an electrode assembly, the electrode assembly is arranged in the shell, and the shell is arranged to be a flexible shell; a protective shell, which has a cavity with at least one side open inside, and at least one of the battery cells is arranged in the cavity; a flexible member, which is stacked with the protective shell, and at least one medium flow channel is formed between the flexible member and the protective shell, and the medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell.

[0006] In the battery device of the embodiment of the present application, the flexible member and the protective shell of the battery cell are stacked to form a medium flow channel between the two. In this way, the protective shell plays a protective role and forms a part of the heat exchange structure at the same time. The flexible member itself also has a small weight, which helps to reduce the overall weight of the battery device, improve energy density, and help reduce costs. On the other hand, the flexible member has a certain flexibility and can better fit with the box and / or battery cell, which is conducive to absorbing assembly tolerances, without the need for caulking agents or thermal conductive materials, improving the fit with the box and / or battery cell, and increasing the effective heat exchange area between the box and / or battery cell, thereby improving the heat exchange efficiency and heat exchange effect.

[0007] In some embodiments, the shell of the battery cell is configured as an aluminum-plastic film.

[0008] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation, which helps to improve the reliability of battery cells.

[0009] In some embodiments, the box body includes a first wall, the first wall is used to constrain the battery cell, and the cavity is open on a side facing the first wall and closed on a side facing away from the first wall.

[0010] In this embodiment, the protection and limitation of the battery cell are achieved through the cooperation between the protective shell and the first wall of the box body. In this way, while achieving better protection and support limitation effects, the overall weight of the protective shell can be reduced, further improving the energy density of the battery device.

[0011] In some embodiments, the first wall is used to support the battery cell.

[0012] In this embodiment, the weight of the battery cell is borne by the first wall, which can reduce the stress on the protective shell, increase its service life, and help reduce the difficulty of assembly.

[0013] In some embodiments, the cavity is open on two opposite sides along a first direction and closed on two opposite sides along a second direction, the first direction intersects the second direction, and both the first direction and the second direction are perpendicular to the thickness direction of the first wall.

[0014] In this embodiment, by making the cavity open in the first direction and closed in the second direction, on the one hand, it helps to further reduce the weight of the protective shell, and on the other hand, it can reduce the expansion force of the battery cell along the first direction on the protective shell, optimize the stress distribution of the protective shell in various directions, and thus reduce the probability of deformation of the protective shell.

[0015] In some embodiments, the first wall is capable of exchanging heat with the battery cell.

[0016] In this embodiment, by configuring the first wall to be able to exchange heat with the battery cell, the heat exchange area can be further increased, thereby improving the thermal management efficiency.

[0017] In some embodiments, the protective shell includes a main body and at least one flange portion connected to the main body, the main body and the flange portion enclose the cavity to form the cavity, the main body covers at least a portion of the battery cell from a side of the battery cell away from the first wall, and the flange portion covers at least a portion of the battery cell from a side of the battery cell.

[0018] In this embodiment, by configuring the protective shell to include a main body portion and a flange portion, it helps to simplify the structure of the protective shell and further reduce its weight.

[0019] In some embodiments, at least one of the flexible members is stacked with the main body.

[0020] In this embodiment, by stacking at least one flexible member and the main body, it helps to increase the heat exchange area and thus improve the heat exchange effect.

[0021] In some embodiments, at least one of the flexible members is stacked with the flange portion.

[0022] In this embodiment, by stacking at least one flexible member and the flange portion, it helps to further increase the heat exchange area.

[0023] In some embodiments, at least one of the flexible members is disposed on a side of the protective shell facing away from the battery cell.

[0024] In this embodiment, by arranging at least one flexible member on the side of the protective shell facing away from the battery cell, it helps to improve the protective effect and supporting and limiting effect of the protective shell on the battery cell.

[0025] In some embodiments, at least one of the flexible members is disposed on a side of the protective shell facing the battery cell.

[0026] In this embodiment, by arranging at least one flexible member on the side of the protective shell facing the battery cell, it helps to improve the heat exchange effect.

[0027] In some embodiments, a flow channel is formed on a side of the flexible member facing the protective shell, and a surface of a side of the protective shell facing the flexible member is a plane.

[0028] In this embodiment, the flow channel groove is formed only on the flexible member, but not on the protective shell. This helps to improve the structural strength of the protective shell, thereby improving the protective effect and support and limiting effect of the protective shell.

[0029] In some embodiments, the protective shell has an inlet and an outlet communicating with the medium flow channel.

[0030] In this embodiment, the inlet and the outlet are arranged in the protective shell instead of the flexible member, so that the connecting piece for connecting the inlet and the outlet will be connected to the protective shell, which helps to improve the connection strength of the connecting piece (the protective shell usually has a higher structural strength), and further helps to improve the reliability of the heat exchange function.

[0031] In some embodiments, the flexible member comprises a metal plasticized film.

[0032] In this embodiment, since the metal plastic film is thin and light in weight, and a medium flow channel is formed between the metal plastic film and the protective shell, it is not affected by the extrusion process and does not need to meet a larger thickness requirement, so the overall thickness and weight can be reduced.

[0033] In some embodiments, the flexible member comprises an aluminum-plastic film.

[0034] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0035] In some embodiments, the flexible member is a layered structure, and the flexible member includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

[0036] In this embodiment, the flexible member formed by stacking the metal layer and the non-metal layer in sequence is thin in thickness and light in weight, and is not affected by the extrusion process and does not need to meet the larger thickness requirement, so the overall thickness and weight can be reduced. In addition, the flexible member will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion leakage.

[0037] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil and steel foil; and / or the non-metal layer includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene.

[0038] By setting the metal layer to one or more of aluminum foil, copper foil and steel foil, the flexible member can have a certain structural strength and can play an isolation role. By setting the non-metal layer to one or more of polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene, the flexible member can have a certain waterproof effect.

[0039] In some embodiments, the non-metallic layer is a hot melt layer.

[0040] In the embodiment, by setting the non-metallic layer as a hot-melt layer, that is, composed of a hot-melt material, it is advantageous to combine the non-metallic layer with the metal layer through hot melting, which makes molding simple and the production efficiency high.

[0041] In some embodiments, the thickness of the flexible member is 0.05 mm-0.3 mm.

[0042] In this embodiment, by setting the thickness of the flexible member to 0.05mm-0.3mm, the overall thickness of the protective shell and the flexible member is small while having a certain structural strength, which is beneficial to reducing the overall volume and weight of the battery device and increasing the energy density of the battery device.

[0043] In some embodiments, the thickness of the flexible member is 0.08 mm-0.2 mm.

[0044] In this embodiment, by setting the thickness of the flexible member to 0.08mm-0.2mm, the overall thickness of the protective shell and the flexible member is small while having a certain structural strength, which is beneficial to reducing the overall volume and weight of the battery device and increasing the energy density of the battery device.

[0045] In some embodiments, the elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

[0046] In this embodiment, by setting the elastic modulus of the flexible part to 0.1MPa-10000MPa, the flexible part can have a certain structural strength, thereby improving the reliability of use, and a certain deformation ability, which can improve the fit with the box and / or battery cell, thereby increasing the effective heat exchange area and improving the heat exchange efficiency and effect.

[0047] In some embodiments, the protective shell is configured as a metal piece.

[0048] In this embodiment, by setting the protective shell as a metal part, the metal part has both good structural strength and good thermal conductivity.

[0049] A second aspect of the embodiments of the present application provides an electrical device, which includes the battery device described in the first aspect of the embodiments of the present application.

[0050] The electrical equipment of the embodiment of the present application has all the advantages of the battery device described in any of the above embodiments, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A schematic diagram of the structure of a vehicle according to an embodiment of the present application; Figure 2 It is a three-dimensional exploded schematic diagram of a battery device according to an embodiment of the present application; Figure 3 This is a schematic diagram of the connection between the protective shell and the flexible member according to an embodiment of the present application; Figure 4 It is a schematic three-dimensional exploded diagram of the protective shell and the flexible member according to an embodiment of the present application.

[0052] Description of Reference Numerals 1000, vehicle; 100, battery device; 10, housing; 11, first sub-housing; 12, second sub-housing; 13, first wall; 20, battery cell; 30, protective shell; 30a, inlet; 30b, outlet; 31, main body; 32, flange portion; 40, flexible member; 40a, medium flow channel; 50, connector; 200, controller; 300, motor. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0054] The various specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by combining different specific technical features. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features in this application will not be described separately.

[0055] In the following description, the terms "first\second\..." are only used to distinguish different objects, and do not mean that the objects have the same or related points. It should be understood that the directions "above", "below", "outside" and "inside" are all directions in normal use, and the directions "left" and "right" refer to the left and right directions shown in the specific corresponding schematic diagrams, which may be the left and right directions in normal use or not.

[0056] It should be noted that the terms "comprises", "includes" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element. "Multiple" means greater than or equal to two.

[0057] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They 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 referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0058] In the description of the present application, the orientation or position relationship of "first direction", "second direction" and "thickness direction of the first wall" is based on the orientation or position relationship shown in the accompanying drawings, wherein the "first direction" is the direction indicated by the arrow L1 in the accompanying drawings, the "second direction" is the direction indicated by the arrow L2 in the accompanying drawings, and the "thickness direction of the first wall" is the direction indicated by the arrow L3 in the accompanying drawings. It should be understood that these orientation terms are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0059] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0060] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0061] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0062] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0063] 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.

[0064] In the embodiment of the present application, the battery cell is a secondary battery, which refers to a battery cell that can be continuously used by activating the active material by charging after the battery cell is discharged.

[0065] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0066] 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.

[0067] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

[0068] 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.

[0069] In some embodiments, the electrode assembly is a laminate structure.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] The battery cell comprises a shell, which can be configured as a flexible shell, for example, an aluminum-plastic film.

[0077] Since the shell structure strength of the soft-pack battery is relatively low, a protective shell needs to be provided in the battery device in which the soft-pack battery is provided to protect the soft-pack battery. In addition, during the use of the battery device, the soft-pack battery 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. In the related art, a protective shell is provided in the box to protect the soft-pack battery, and a cooling system is provided in the box to cool the soft-pack battery. The cooling system may include a plurality of aluminum water-cooling plates laid in the battery device box, and the surfaces of the plurality of water-cooling plates are in contact with the surfaces of the soft-pack batteries. During use, a heat exchange medium such as water flows through the plurality of water-cooling plates, thereby taking away the heat from the soft-pack battery and cooling the soft-pack battery. The above-mentioned battery device has problems such as heavy weight and high cost.

[0078] In view of this, in order to reduce the weight and cost of the battery device, an embodiment of the present application provides a battery device, which includes a box, a battery cell, a protective shell and a flexible member. The battery cell is arranged in the box, and the battery cell includes a shell and an electrode assembly. The electrode assembly is arranged in the shell, and the shell is arranged as a flexible shell. A cavity with at least one side open is formed inside the protective shell, and at least one battery cell is arranged in the cavity. The flexible member and the protective shell are stacked, and at least one medium flow channel is formed between the flexible member and the protective shell. The medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell.

[0079] In the battery device of the embodiment of the present application, the flexible member and the protective shell of the battery cell are stacked to form a medium flow channel between the two. In this way, the protective shell plays a protective role and forms a part of the heat exchange structure at the same time. The flexible member itself also has a small weight, which helps to reduce the overall weight of the battery device, improve energy density, and help reduce costs. On the other hand, the flexible member has a certain flexibility and can better fit with the box and / or battery cell, which is conducive to absorbing assembly tolerances, without the need for caulking agents or thermal conductive materials, improving the fit with the box and / or battery cell, and increasing the effective heat exchange area between the box and / or battery cell, thereby improving the heat exchange efficiency and heat exchange effect.

[0080] The technical solution described in the embodiments of the present application is applicable to an electric device using a battery device. The electric device includes a battery device in any embodiment of the present application, and the battery device is used to provide electric energy.

[0081] 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 may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include 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 may include 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 application do not impose any special restrictions on the above-mentioned electrical devices.

[0082] It should be noted that the technical solutions described in the embodiments of the present application 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.

[0083] Reference Figure 1, a controller 200, a motor 300 and a battery device 100 may be arranged 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 arranged 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 application, the battery device 100 may not only be used as an operating power source for the vehicle 1000, but also 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.

[0084] Reference Figure 2-Figure 4 The battery device 100 of the embodiment of the present application includes a box body 10, a battery cell 20, a protective shell 30 and a flexible member 40. The battery cell 20 is arranged in the box body 10, and the battery cell 20 includes a shell and an electrode assembly (not shown in the figure), the electrode assembly is arranged in the shell, and the shell is arranged as a flexible shell. A cavity with at least one side open is formed inside the protective shell 30, and at least one battery cell 20 is arranged in the cavity. The flexible member 40 and the protective shell 30 are stacked, and at least one medium flow channel 40a is formed between the flexible member 40 and the protective shell 30. The medium flow channel 40a is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell 20.

[0085] The box 10 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 box 10 can be made of alloy materials such as aluminum alloy, iron alloy, etc., or polymer materials such as polycarbonate, polyisocyanurate foam plastic, or composite materials such as glass fiber and epoxy resin.

[0086] The box body 10 is used to encapsulate the battery cells, and the box body 10 can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0087] As an example, the box 10 is generally a rectangular parallelepiped structure, the length and width directions of the box 10 are parallel to the horizontal plane, and the length direction of the box 10 is parallel to the longest side of the rectangular parallelepiped structure of the box 10. The height direction of the box 10 is perpendicular to the ground.

[0088] As an example, see Figure 2 The box 10 includes a first sub-box 11 and a second sub-box 12. The first sub-box 11 and the second sub-box 12 are distributed along the height direction. As an example, the first sub-box 11 is a top cover, and the second sub-box 12 is a lower box. The battery cell 20 includes a housing and an electrode assembly, wherein the electrode assembly is disposed in the housing, and the housing is configured as a flexible housing. As an example, the housing is configured as an aluminum plastic film or other metal plastic film, or any other suitable flexible material, which is not limited thereto.

[0089] The specific structural forms of the shell and the electrode assembly can refer to the description of the relevant parts above, which will not be repeated here.

[0090] The battery device may include multiple battery cells 20, at least a portion of the battery cells 20 may be distributed along a first direction, and / or at least a portion of the battery cells 20 may be distributed along a second direction, the first direction intersects with the second direction, and taking the box body 10 as a rectangular structure as an example, the first direction may be the length direction of the box body 10, and the second direction may be the width direction of the box body 10.

[0091] It can be understood that since the shell of the battery cell 20 is a flexible shell, that is, the battery cell 20 is a soft-pack battery, its structural strength is relatively low. For this reason, the battery device also includes a protective shell 30, which is used to provide protection, limiting and other functions for the battery cell 20.

[0092] Reference Figure 2-Figure 4 A cavity with at least one side open is formed inside the protective shell 30, and at least one battery cell 20 is disposed in the cavity.

[0093] Here, the cavity may have only one side open or multiple sides open, and there is no limitation to this, and those skilled in the art may make a specific determination based on actual assembly requirements.

[0094] As mentioned above, the battery device 100 may include a plurality of battery cells 20. In this case, the protective shell 30 may be disposed one-to-one with the battery cells 20, that is, only one battery cell 20 is disposed in one cavity, or one protective shell 30 may correspond to a plurality of battery cells 20, that is, a plurality of battery cells 20 are disposed in one cavity. In some embodiments, at least a portion of the protective shell 30 is located between adjacent battery cells 20.

[0095] The specific structural form of the flexible member 40 is not limited. As an example, the flexible member 40 is generally a plate-shaped structure.

[0096] Here, the flexibility in the flexible part refers to the material property of the structure, and 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 any one of the material's thickness, stiffness, strength, elastic modulus, etc. As an example, the material of the flexible part 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 part.

[0097] The provision of the flexible member 40 helps to further reduce the weight of the battery device 100 , thereby increasing the energy density of the battery device 100 .

[0098] Furthermore, the flexible part 40 has certain expandable or contractible properties, and it can also be understood that the flexible part 40 can be an elastically deformable structure, and the flexible part 40 has the ability to deform and restore deformation, so that the flexible part 40 can adapt to the external contour shape of the battery cell 20 or other components through a certain elastic deformation to improve its fit with the box 10 and / or the battery cell 20, thereby increasing the effective heat exchange area and further improving the heat exchange efficiency.

[0099] It can be understood that the flexible member 40 and the shell of the battery cell 20 are both flexible structures, and the materials of the two can be the same or different.

[0100] In some embodiments, in order to provide better protection and support, the protective shell 30 is configured as a rigid part. Here, the rigidity in the rigid part refers to the material properties of the structure. This type of property can be a property given to the material due to the heavy mass of the material, or it can be a property given to the material due to at least any one of the properties of the material such as thickness, rigidity, strength, elastic modulus, etc. As an example, the material of the rigid part can be selected to be a metal plate similar to a conventional aluminum plate, steel plate, or a material of a structure such as a composite plate, and its rigidity can be controlled by the thickness, width, length, and type of material of the rigid part.

[0101] The flexible member 40 and the protective shell 30 are stacked. Here, the stacked arrangement specifically means that the flexible member 40 and the protective shell 30 are distributed along the stacking direction, and when projected onto the same projection plane along the stacking direction, the projection of the flexible member 40 and the projection of the protective shell 30 at least partially overlap.

[0102] There is no limitation on the stacking direction of the flexible part 40 and the protective shell 30. As an example, at least one flexible part 40 and the protective shell 30 are stacked along the height direction (thickness direction of the first wall), and / or at least one flexible part 40 and the protective shell 30 are stacked along the first direction, and / or at least one protective part and the protective shell 30 are stacked along the second direction.

[0103] At least one flexible member 40 is disposed on a side of the protective shell 30 facing away from the battery cell 20 , and / or at least one flexible member 40 is disposed on a side of the protective shell 30 facing the battery cell 20 .

[0104] The specific connection method between the flexible member 40 and the protective shell 30 is not limited, such as bonding, welding, etc.

[0105] At least one medium flow channel 40a is formed between the flexible member 40 and the protective shell 30. In other words, the flexible member 40 constitutes at least part of the side wall of the medium flow channel 40a, and the protective shell 30 also constitutes at least part of the side wall of the medium flow channel 40a. The heat exchange medium flows in the medium flow channel 40a to achieve heat exchange with the battery cell 20.

[0106] As an example, the side surface of the flexible member 40 facing the protective shell 30 is recessed to form a flow channel groove, and the side surface of the protective shell 30 facing the flexible member 40 is a plane, and the plane and the flow channel groove are arranged to form a medium flow channel 40a. Alternatively, the side surface of the protective shell 30 facing the flexible member 40 is recessed to form a flow channel groove, and the side surface of the flexible member 40 facing the protective shell 30 is a plane, and the plane and the flow channel groove are arranged to form a medium flow channel 40a. Alternatively, the surfaces of the flexible member 40 and the protective shell 30 facing each other are both recessed to form a flow channel groove, and the flow channel groove of the flexible member 40 and the flow channel groove of the protective shell 30 are arranged to form a medium flow channel 40a.

[0107] The medium channel 40a is used to conduct the heat exchange medium. It should be noted that the specific type of the heat exchange medium is not limited here, as long as it can have a heat exchange effect on the battery cell 20, for example, it can be gaseous or liquid. In the embodiment of the present application, the heat exchange medium is described as a coolant.

[0108] The specific number of the medium flow channels 40a is not limited here, and can be one or more.

[0109] As an example, see Figure 4 At least one of the flexible member 40 and the protective shell 30 has an inlet 30a and an outlet 30b, and both the inlet 30a and the outlet 30b are connected to the medium flow channel 40a. Here, the inlet 30a and the outlet 30b are used for the heat exchange medium to enter and flow out of the medium flow channel 40a. The protective shell 30 may form the above-mentioned inlet 30a and / or outlet 30b, or the flexible member 40 may form the above-mentioned inlet 30a and / or outlet 30b.

[0110] As an example, see Figure 3 and Figure 4 The battery device 100 further includes a connector 50 communicating with the inlet 30a and a connector 50 communicating with the outlet 30b. As an example, the connector 50 includes a water nozzle. As an example, the inlet 30a and the outlet 30b are both formed in the protective shell 30, and the connector 50 is connected to the protective shell 30 by brazing.

[0111] The principle of heat exchange for the battery cell 20 by the heat exchange structure composed of the flexible part 40 and the protective shell 30 is as follows: the heat exchange medium output by the heat exchange medium source (not shown) enters the medium flow channel 40a through the inlet 30a, and after the heat exchange medium exchanges heat with the battery cell 20, the heat exchange medium flows out through the outlet 30b, completing the heat exchange for the battery cell 20.

[0112] Here, exchanging heat for the battery cell 20 may be dissipating heat for the battery cell 20 , or may be heating for the battery cell 20 .

[0113] The principle of heat exchange structure for dissipating heat for battery cell 20 is as follows: the heat exchange medium output by the heat exchange medium source enters the medium flow channel 40a through the inlet 30a, and after the heat exchange medium absorbs the heat generated during the operation of the battery cell 20, the heat exchange medium flows out through the outlet 30b to release the heat, thereby completing the cooling and heat dissipation of the battery cell 20.

[0114] The principle of the heat exchange structure heating the battery cell 20 is as follows: the heat exchange medium output by the heat exchange medium source enters the medium flow channel 40a through the inlet 30a, and the heat exchange medium transfers heat to the battery cell 20. After heating the battery cell 20, the heat exchange medium flows out through the outlet 30b, completing the heating of the battery cell 20.

[0115] It should be noted that, since the protective shell 30 is located between the battery cell 20 and the housing 10 , the heat exchange structure can exchange heat with the housing 10 in addition to the battery cell 20 .

[0116] In the battery device 100 of the embodiment of the present application, the flexible member 40 and the protective shell 30 of the battery cell 20 are stacked to form a medium flow channel 40a therebetween, so that the protective shell 30 can be formed as a part of the heat exchange structure while playing a protective role, and the flexible member 40 itself also has a small weight, thereby helping to reduce the overall weight of the battery device 100, improve energy density, and help reduce costs. On the other hand, the flexible member has a certain degree of flexibility and can better fit with the box and / or battery cell, which is conducive to absorbing assembly tolerances, without the need for caulking agents or thermal conductive materials, improving the fit with the box and / or battery cell, and increasing the effective heat exchange area between the box and / or battery cell, thereby improving the heat exchange efficiency and heat exchange effect.

[0117] In some embodiments, the housing of the battery cell 20 is configured as an aluminum-plastic film.

[0118] The aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation, which helps to improve the reliability of the battery cell 20.

[0119] In a specific embodiment, referring to Figure 2 The box body 10 includes a first wall 13, and the first wall 13 is used to constrain the battery cell. The cavity is open on a side facing the first wall 13 and closed on a side facing away from the first wall 13.

[0120] Here, the first wall 13 can be any wall of the box body 10 that can constrain the battery cell 20. Taking the box body 10 as a rectangular structure as an example, the first wall 13 can be a wall in the length direction of the box body, a wall in the width direction, or a wall in the height direction, without limitation.

[0121] The cavity is open on one side facing the first wall 13 and closed on the other side facing away from the first wall 13 . Thus, the protective shell 30 can protect and restrain the battery cell 20 together with the first wall 13 .

[0122] In this embodiment, the cavity may be open or closed in other directions, and there is no limitation on this.

[0123] In this embodiment, the protection and limitation of the battery cell 20 are achieved by the mutual cooperation between the protective shell 30 and the first wall 13 of the box body 10. In this way, while obtaining better protection and support limitation effects, the overall weight of the protective shell 30 can be reduced, further improving the energy density of the battery device.

[0124] In some embodiments, specifically, the first wall 13 is used to support the battery cells 20 .

[0125] Here, the first wall 13 is used to support the battery cell 20, which specifically means that the first wall 13 is used to support at least a portion of the weight of the battery cell 20. In other words, at least a portion of the first wall 13 is located on the bottom side of the battery cell 20. As an example, the first wall 13 includes the bottom plate and / or bottom guard plate of the box body 10.

[0126] In this embodiment, the weight of the battery cell 20 is borne by the first wall 13 , which can reduce the stress on the protective shell 30 , increase its service life, and help reduce the difficulty of assembly.

[0127] In some embodiments, reference Figure 2 The cavity is open on two opposite sides along the first direction and closed on two opposite sides along the second direction. The first direction intersects the second direction, and both the first direction and the second direction are perpendicular to the thickness direction of the first wall 13 .

[0128] In this embodiment, the protective shell 30 is actually formed into a U-shaped shell structure.

[0129] Taking the box body 10 as a rectangular structure, the first wall 13 is used to support the battery cell 20 as an example, and the thickness direction of the first wall 13 is the height direction of the box body 10 as an example, the first direction can be one of the length direction and the width direction of the box body 10, and the second direction can be the other of the length direction and the width direction of the box body 10.

[0130] In this embodiment, by making the cavity open in the first direction and closed in the second direction, on the one hand, it helps to further reduce the weight of the protective shell 30, and on the other hand, it can protect the protective shell 30 from the expansion force of the battery cell 20 along the first direction, optimize the stress distribution of the protective shell 30 in various directions, and thus reduce the probability of deformation of the protective shell 30.

[0131] In some embodiments, specifically, the box body 10 includes a plurality of battery cells 20 distributed along a first direction, and the first direction is perpendicular to a large surface of the battery cells 20 .

[0132] Here, the large surface refers to the surface with the largest area among the surfaces of the battery cell 20. It can be understood that in this embodiment, the expansion force of the battery cell 20 is mainly along the first direction, and the protective shell 30 is opened on both sides in the first direction. This helps to further reduce the expansion force received by the protective shell 30 from the battery cell 20.

[0133] In some embodiments, the first wall 13 is capable of exchanging heat with the battery cell 20 .

[0134] The specific implementation method of heat exchange between the first wall 13 and the battery cell 20 is not limited. As an example, the first wall 13 may be provided with a passive heat dissipation structure such as a heat dissipation fin, so that it can exchange heat with the battery cell 20. Alternatively, a flow channel may be formed inside the first wall 13, and the flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell 20. Here, the heat exchange medium may be the same as the heat exchange medium in the medium flow channel 40a mentioned above, or it may be different. In some examples, the flow channel inside the first wall 13 may be connected to the above-mentioned medium flow channel 40a.

[0135] In this embodiment, by configuring the first wall 13 to be able to exchange heat with the battery cell 20 , the heat exchange area can be further increased, thereby improving the thermal management efficiency.

[0136] In some embodiments, reference Figure 2-Figure 4 The protective shell 30 includes a main body 31 and at least one flange portion 32 connected to the main body 31, the main body 31 covers at least part of the battery cell 20 from the side of the battery cell 20 away from the first wall 13, and the flange portion 32 covers at least part of the battery cell 20 from the side of the battery cell 20.

[0137] As an example, the main body 31 and the flange 32 are both roughly plate-shaped structures. The main body 31 may only cover a portion of the battery cell 20 or may completely cover the battery cell 20 , and the same is true for the flange 32 .

[0138] The specific connection method of the main body 31 and the flange 32 is not limited, such as bonding, welding, fastener connection, etc., or the main body 31 and the flange 32 form an integrated structure.

[0139] In this embodiment, by configuring the protective shell 30 to include a main body portion 31 and a flange portion 32 , it helps to simplify the structure of the protective shell 30 and further reduce its weight.

[0140] In some embodiments, at least one flexible member 40 is stacked with the main body 31 .

[0141] Here, at least one flexible member 40 may be disposed on a side of the main body 31 facing the battery cell 20 , or on a side of the main body 31 facing away from the battery cell 20 , or may be disposed on both sides.

[0142] In this embodiment, by stacking at least one flexible member 40 and the main body 31 , it is helpful to increase the heat exchange area and thus improve the heat exchange effect.

[0143] In some embodiments, at least one flexible member 40 is stacked with the flange portion 32 .

[0144] In this embodiment, the flexible member 40 may be disposed on the side of the flange portion 32 facing the battery cell 20 , or may be disposed on the side of the flange portion 32 facing away from the battery cell 20 , and there is no limitation to this.

[0145] In this embodiment, by stacking at least one flexible member and the flange portion 32 , it helps to further increase the heat exchange area.

[0146] In some embodiments, reference Figure 2-Figure 4 At least one flexible member 40 is disposed on a side of the protective shell 30 facing away from the battery cell 20 .

[0147] Here, the side of the protective case 30 facing away from the battery cell 20 may refer to a side of any portion of the protective case 30 facing away from the battery cell 20 .

[0148] When there are multiple flexible members 40 , only a portion of the flexible members 40 may be disposed on the side of the protective shell 30 away from the battery cell 20 , or all of the flexible members 40 may be disposed on the side of the protective shell 30 away from the battery cell 20 .

[0149] It can be understood that the protective shell 30 generally has a higher structural strength than the flexible member 40, especially in the embodiment where the flexible member 40 is set as a flexible member. Therefore, in this embodiment, by setting at least one flexible member 40 on the side of the protective shell 30 away from the battery cell 20, it is helpful to improve the protective effect and support and limit effect of the protective shell 30 on the battery cell 20.

[0150] In some embodiments, at least one flexible member 40 is disposed on a side of the protective shell 30 facing the battery cell 20 .

[0151] Here, the side of the protective case 30 facing the battery cell 20 may refer to a side of any portion of the protective case 30 facing the battery cell 20 .

[0152] When there are multiple flexible members 40 , only a portion of the flexible members 40 may be disposed on the side of the protective shell 30 facing the battery cell 20 , or all of the flexible members 40 may be disposed on the side of the protective shell 30 facing the battery cell 20 .

[0153] It can be understood that compared with the protective shell 30, the flexible part 40 generally has better thermal conductivity. For example, the thermal conductivity of the flexible part 40 is higher than the thermal conductivity of the protective shell 30. For example, in an embodiment where the flexible part 40 is set as a flexible part, the flexible part can have a larger contact area with the battery cell 20 and / or fit more closely.

[0154] Therefore, in this embodiment, by disposing at least one flexible member 40 on the side of the protective shell 30 facing the battery cell 20 , the heat exchange effect is improved.

[0155] In some embodiments, there are multiple flexible parts 40, at least one flexible part 40 is arranged on the side of the protective shell 30 facing the battery cell 20, and at least one flexible part 40 is arranged on the side of the protective shell 30 away from the battery cell 20. In this way, the volume of the heat exchange medium that the medium flow channel 40a can accommodate can be increased to obtain a better heat exchange effect.

[0156] In some embodiments, a flow channel is formed on a side of at least one of the flexible member 40 and the protective shell 30 facing the other, and the flow channel and the other of the flexible member 40 and the protective shell 30 are surrounded to form a medium flow channel 40 a.

[0157] As mentioned above, only one of the flexible member 40 and the protective shell 30 may form a flow channel, and the surface of the other facing the flow channel is a plane, or both the flexible member 40 and the protective shell 30 may form a flow channel.

[0158] The flow channel groove can be formed in the flexible member 40 and / or the protective shell 30 by stamping, etching, injection molding, etc., which is not limited.

[0159] In this embodiment, a flow channel groove is formed in the flexible member 40 and / or the protective shell 30 to form a medium flow channel 40a between the two. This arrangement helps to form a medium flow channel 40a with a relatively regular cross-sectional shape, thereby increasing the flow rate of the heat exchange medium in the medium flow channel 40a, reducing flow resistance, and thus improving heat exchange efficiency. In addition, this arrangement helps to reduce the space occupied in the box 10, thereby helping to increase the energy density of the battery device 100.

[0160] It should be noted that the formation method of the medium flow channel 40a is not limited to this. For example, in an embodiment where the flexible member 40 is set as a flexible member, the flexible member 40 can be fixedly connected to the protective shell 30 in a part of the area, and the other part of the area is not fixed to the protective shell 30. The flexible member in the unfixed area will form a gap with the protective shell 30 after the heat exchange medium is passed in, and the gap is the medium flow channel 40a. For another example, the flexible member 40 can be spaced apart from the protective shell 30 to form the medium flow channel 40a.

[0161] In some embodiments, a flow channel is formed on a side of the flexible member 40 facing the protective shell 30 , and a surface of the side of the protective shell 30 facing the flexible member 40 is a plane.

[0162] In this embodiment, the flow channel groove is formed only on the flexible member 40 , but not on the protective shell 30 . This helps to improve the structural strength of the protective shell 30 , thereby improving the protective effect and the supporting and limiting effect of the protective shell 30 .

[0163] In some embodiments, the protective shell 30 has an inlet 30a and an outlet 30b communicating with the medium flow channel 40a.

[0164] In this embodiment, the inlet 30a and the outlet 30b are arranged in the protective shell 30 instead of the flexible member 40. In this way, the connector 50 for connecting the inlet 30a and the outlet 30b will be connected to the protective shell 30, which helps to improve the connection strength of the connector 50 (the protective shell 30 usually has a higher structural strength), and further helps to improve the reliability of the heat exchange function.

[0165] In some embodiments, the flexible member 40 and the protective shell 30 are hot pressed to form a hot pressing area, and the hot pressing area separates the flexible member and the protective shell 30 to form at least one medium flow channel 40 a.

[0166] In this embodiment, the flexible member 40 is sealed by a hot pressing process, that is, a hot pressing area is formed by hot pressing, and the hot pressing area separates the flexible member and the protective shell 30 to form at least one medium flow channel 40a. This molding method is simple.

[0167] In some embodiments, the width of the heat-pressed area is 0.5 mm to 5 mm.

[0168] For example, the point value is any one of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.3mm, 1.5mm, 1.6mm, 1.8mm, 2.0mm, 2.5mm, 3.0mm, 3.3mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 4.0mm, 4.2mm, 4.5mm, 4.6mm, 4.8mm, 4.9mm, and 5mm, or a point value between any two of them, etc.

[0169] It can be understood that, in some cases, different medium flow channels 40a are separated by a hot pressing area, and thus, a hot pressing area of ​​sufficient width is conducive to ensuring the sealing of the medium flow channel 40a, that is, it is conducive to ensuring the reliability of the medium flow channel 40a.

[0170] By setting the width of the hot pressing area to 0.5 mm-5 mm, it is beneficial to the reliability of the medium flow channel 40 a and also beneficial to improve the coverage of the medium flow channel 40 a, thereby improving the heat exchange efficiency.

[0171] In some embodiments, the width of the heat pressed area is 2 mm-3 mm.

[0172] For example, it may be any point value of 2.0mm, 2.1mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm or any point value between any two of them, and so on.

[0173] In this embodiment, by setting the width of the hot pressing area to 2 mm-3 mm, it is beneficial to improve the reliability of the medium flow channel 40a of the flexible member 40 while further improving the coverage of the medium flow channel 40a, thereby further improving the heat exchange efficiency.

[0174] In some embodiments, the flexible member 40 includes a metal plasticized film.

[0175] The flexible member 40 is a single-layer or multi-layer film.

[0176] Here, the metal-plasticized film is a metal-plastic composite material, that is, it includes a metal layer and a plastic layer, and the plastic layer is formed as the above-mentioned insulating layer.

[0177] In this embodiment, since the metal plastic film is thin and light in weight, and the medium flow channel 40a is formed between the metal plastic film and the protective shell 30, it is not affected by the extrusion process and does not need to meet a larger thickness requirement, so the overall thickness and weight can be reduced.

[0178] In some embodiments, the flexible member 40 comprises an aluminum-plastic film.

[0179] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0180] In some embodiments, the flexible member 40 is a layered structure, and the flexible member 40 includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

[0181] Here, the flexible member 40 includes a metal layer and a non-metal layer, that is, a composite material member composed of the metal layer and the non-metal layer.

[0182] As an example, the metal layer and the non-metal layer may be formed by hot pressing or hot melting.

[0183] There is no limit to the number of metal layers and non-metal layers.

[0184] In this embodiment, the flexible member 40, which is formed by stacking metal layers and non-metal layers in sequence, is thin and light in weight. It is not affected by the extrusion process and does not need to meet a large thickness requirement, so the overall thickness and weight can be reduced. In addition, the flexible member 40 will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion leakage.

[0185] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil, and steel foil.

[0186] By setting the metal layer to be one or more of aluminum foil, copper foil and steel foil, the flexible member 40 can have a certain structural strength and can play an isolation role.

[0187] In some embodiments, the non-metallic layer includes one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0188] By setting the non-metal layer to be one or more of polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene, the flexible member 40 can have a certain waterproof effect.

[0189] As an example, a non-metallic layer made of a corrosion-resistant material having acid and alkali corrosion resistance may be selected, or in other words, an additive may be added to the non-metallic layer to make the non-metallic layer have acid and alkali corrosion resistance.

[0190] In some embodiments, the non-metallic layer is a hot melt layer.

[0191] In this embodiment, by setting the non-metallic layer as a hot-melt layer, that is, composed of hot-melt material, it is beneficial to combine the non-metallic layer and the metal layer through hot melting, which makes molding simple and has high production efficiency.

[0192] In some embodiments, the thickness of the flexible member 40 is 0.05 mm-0.3 mm.

[0193] As an example, the thickness of the flexible member 40 is any one of 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.21 mm, 0.22 mm, 0.25 mm, 0.27 mm, 0.28 mm, 0.3 mm or any value therebetween.

[0194] In this embodiment, by setting the thickness of the flexible member 40 to 0.05 mm-0.3 mm, the overall thickness of the protective shell 30 and the flexible member 40 is reduced while having a certain structural strength, which is beneficial to reducing the overall volume and weight of the battery device 100 and increasing the energy density of the battery device 100.

[0195] In some embodiments, the thickness of the flexible member 40 is 0.08 mm-0.2 mm.

[0196] As an example, the thickness of the flexible member 40 is any one of 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm or any value therebetween.

[0197] In this embodiment, by setting the thickness of the flexible member 40 to 0.08 mm-0.2 mm, the overall thickness of the protective shell 30 and the flexible member 40 is reduced while having a certain structural strength, which is beneficial to reducing the overall volume and weight of the battery device 100 and increasing the energy density of the battery device 100.

[0198] In some embodiments, the elastic modulus of the flexible member 40 is 0.1 MPa-10000 MPa.

[0199] As an example, the elastic modulus of the flexible member 40 can be any one of 0.1 MPa, 1 MPa, 50 MPa, 100 MPa, 150 MPa, 200 MPa, 300 MPa, 500 MPa, 800 MPa, 1000 MPa, 1300 MPa, 1500 MPa, 1800 MPa, 2000 MPa, 2500 MPa, 2800 MPa, 3000 MPa, 3500 MPa, 4000 MPa, 4500 MPa, 5000 MPa, 5500 MPa, 6000 MPa, 6500 MPa, 7000 MPa, 7500 MPa, 8000 MPa, 8500 MPa, 8800 MPa, 9000 MPa, 9500 MPa, 9700 MPa, and 10000 MPa, or any value between any two of them.

[0200] The elastic modulus describes the unit strain caused by unit stress when a solid is subjected to force within a certain range. It is one of the basic physical quantities of a material. The larger the elastic modulus, the greater the stiffness of the material and the greater its compressive resistance. The elastic modulus is a physical quantity that describes the elasticity of a material.

[0201] The elastic modulus of the flexible member 40 may be measured by at least one of a static tensile test method, a dynamic test method, a sonic velocity method, a nanoindentation method, and a bending method. The measuring instrument may include a nanoindenter and a universal testing machine.

[0202] For example, the elastic modulus of the flexible member 40 can be measured at room temperature and pressure by a nanoindentation method, which uses a tiny indenter to indent the surface of the flexible member 40 and calculates the elastic modulus by analyzing the relationship between the indentation depth and the load.

[0203] In this embodiment, by setting the elastic modulus of the flexible part 40 to 0.1MPa-10000MPa, the flexible part 40 has a certain structural strength, which improves the reliability of use, and has a certain deformation ability, which can improve the fit with the box 10 and / or the battery cell 20, thereby increasing the effective heat exchange area and improving the heat exchange efficiency and effect.

[0204] In some embodiments, the elongation at break of the flexible member 40 is greater than the elongation at break of the protective shell 30. The elongation at break is a percentage of the elongation of the material when it is stretched and broken to the original length. It is used to measure the deformation capacity that the material can withstand during the stretching process, that is, the elongation at break indicates the ductility of the material when it is stretched under force.

[0205] The elongation at break of the flexible member 40 is greater than the elongation at break of the protective shell 30 . In other words, when stretched by force, the ductility of the flexible member 40 is greater than the ductility of the protective shell 30 .

[0206] In some embodiments, the elongation at break of the flexible member 40 is in a range of 30% to 300%.

[0207] The elongation at break of the flexible member 40 may be any one of 30%, 50%, 60%, 80%, 90%, 100%, 130%, 150%, 160%, 170%, 190%, 200%, 220%, 150%, 260%, 280%, 290%, 300% or any value therebetween.

[0208] In this embodiment, by setting the elongation at break of the flexible member 40 to be in the range of 30% to 300%, the flexible member 40 can have certain impact resistance and puncture resistance as well as certain structural strength.

[0209] In some embodiments, the elongation at break of the protective shell 30 is in a range of 1% to 50%.

[0210] The elongation at break of the protective shell 30 may be any one of 1%, 3%, 5%, 6%, 8%, 9%, 10%, 13%, 15%, 16%, 17%, 19%, 20%, 25%, 28%, 30%, 32%, 35%, 38%, 40%, 43%, 45%, 48%, 50% or any value therebetween.

[0211] In this embodiment, by setting the elongation at break of the protective shell 30 to be in the range of 1% to 50%, the protective shell 30 can have sufficient structural strength, which is beneficial to improving its protective effect.

[0212] In some embodiments, the protective shell 30 is configured as a metal piece.

[0213] As an example, the protective shell 30 may be an aluminum alloy plate, and the outer surface thereof may be subjected to insulation treatment.

[0214] In this embodiment, by setting the protective shell 30 as a metal piece, the metal piece has both good structural strength and good thermal conductivity.

[0215] In some embodiments, the protective shell 30 is configured as an aluminum alloy.

[0216] The battery device 100 provided in the embodiment of the present application is further described below with reference to a specific embodiment.

[0217] Reference Figure 2-Figure 4 The battery device 100 includes a box body 10 , a battery cell 20 , a protective shell 30 and a flexible member 40 .

[0218] The battery cell 20 is disposed in the box body 10 . The battery cell 20 includes a shell and an electrode assembly (not shown in the figure). The electrode assembly is disposed in the shell, and the shell is configured as a flexible shell.

[0219] The protective shell 30 is configured as a rigid member, more specifically, a metal member. The protective shell 30 is configured in a one-to-one correspondence with the battery cells 20 .

[0220] The box body 10 includes a first wall 13, and the first wall 13 carries the battery cell 20. The protective shell 30 forms a cavity, which is open on one side facing the first wall 13, closed on one side facing away from the first wall 13, open on two opposite sides along a first direction, and closed on two opposite sides along a second direction, the first direction and the second direction intersect, and both the first direction and the second direction are perpendicular to the thickness direction of the first wall 13.

[0221] The protective shell 30 includes a main body 31 and two flanges 32 connected to the main body 31. The main body 31 covers at least part of the battery cell 20 from the side of the battery cell 20 away from the first wall 13. The two flanges 32 are connected to opposite sides of the main body 31 along the second direction. The flanges 32 extend toward the first wall and cover at least part of the battery cell 20 along the second direction.

[0222] The flexible member 40 and the protective shell 30 are stacked, and at least one medium flow channel 40 a is formed between the flexible member 40 and the protective shell 30 . The medium flow channel 40 a is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell 20 .

[0223] The flexible member 40 is specifically disposed on a side of the main body 31 of the protective shell 30 that is away from the battery cell 20 .

[0224] An embodiment of the present application further provides an electrical device, which includes the battery device 100 as described in any of the above embodiments.

[0225] The electrical equipment of the embodiment of the present application has all the advantages of the battery device 100 described in any of the above embodiments, which will not be described in detail here.

[0226] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means 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 application. In the present application, the schematic representation of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0227] 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 shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: Box; A battery cell is arranged in the box; the battery cell comprises a shell and an electrode assembly, the electrode assembly is arranged in the shell, and the shell is arranged as a flexible shell; A protective shell, wherein a cavity is formed inside with at least one side open, and at least one of the battery cells is disposed in the cavity; A flexible member is stacked with the protective shell, and at least one medium flow channel is formed between the flexible member and the protective shell. The medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell.

2. The battery device according to claim 1, characterized in that: The shell of the battery cell is configured as an aluminum-plastic film.

3. The battery device according to claim 1, characterized in that: The box body comprises a first wall, wherein the first wall is used to constrain the battery cell, and the cavity is open on a side facing the first wall and closed on a side facing away from the first wall.

4. The battery device according to claim 3, characterized in that: The first wall is used to support the battery cell.

5. The battery device according to claim 3, characterized in that: The cavity is open at two opposite sides along a first direction and closed at two opposite sides along a second direction. The first direction intersects with the second direction, and both the first direction and the second direction are perpendicular to the thickness direction of the first wall.

6. The battery device according to claim 3, characterized in that: The first wall is capable of exchanging heat with the battery cell.

7. The battery device according to claim 3, characterized in that: The protective shell comprises a main body and at least one flange portion connected to the main body, wherein the main body and the flange portion surround and form the cavity. The main body portion covers at least a portion of the battery cell from a side of the battery cell away from the first wall, and the flange portion covers at least a portion of the battery cell from a side surface of the battery cell.

8. The battery device according to claim 7, characterized in that: At least one of the flexible members is stacked with the main body.

9. The battery device according to claim 8, characterized in that: At least one of the flexible members is stacked with the flange portion.

10. The battery device according to claim 1, characterized in that: At least one of the flexible members is disposed on a side of the protective shell facing away from the battery cell.

11. The battery device according to claim 1, characterized in that: At least one of the flexible members is disposed on a side of the protective shell facing the battery cell.

12. The battery device according to claim 1, characterized in that: A flow channel is formed on one side of the flexible member facing the protective shell, and a surface of one side of the protective shell facing the flexible member is a plane.

13. The battery device according to claim 1, characterized in that: The protective shell has an inlet and an outlet communicated with the medium flow channel.

14. The battery device according to any one of claims 1 to 13, characterized in that: The flexible member includes a metal plasticized film.

15. The battery device according to claim 14, characterized in that: The flexible member comprises an aluminum-plastic film.

16. The battery device according to any one of claims 1 to 13, characterized in that: The flexible member is a layered structure, and includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

17. The battery device according to claim 16, characterized in that: The metal layer includes one or more of aluminum foil, copper foil and steel foil; and / or, The non-metallic layer includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene.

18. The battery device according to claim 16, characterized in that: The non-metallic layer is a hot-melt layer.

19. The battery device according to any one of claims 1 to 13, characterized in that: The thickness of the flexible member is 0.05mm-0.3mm.

20. The battery device according to claim 19, characterized in that The thickness of the flexible member is 0.08 mm-0.2 mm.

21. The battery device according to any one of claims 1 to 13, characterized in that: The elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

22. The battery device according to any one of claims 1 to 13, characterized in that: The protective shell is configured as a metal part.

23. An electrical equipment, characterized in that: The electrical equipment comprises the battery device according to any one of claims 1-22.

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