Battery device and electric appliance

Abstract

An embodiment of the present application provides a battery device and an electrical device, wherein the battery device includes a housing, a soft-pack battery module, a protective shell and at least one flexible part. A battery cell is disposed in the housing, and the battery cell includes a shell and an electrode assembly. The shell is configured as a flexible shell, and a cavity with at least one side open is formed inside the protective shell. At least one battery cell is disposed in the cavity, and the flexible part and the protective shell are stacked, and at least one medium flow channel is formed between the flexible part and the protective shell. In the battery device of the embodiment of the present application, the flexible part and the protective shell of the battery cell are stacked to form a medium flow channel therebetween, which helps to reduce the overall weight of the battery device and improve the energy density. On the other hand, the flexible part has a certain degree of flexibility and can better fit with the housing and / or the battery cell, thereby improving the heat exchange efficiency and effect.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of battery, and in particular, to a battery device and an electric equipment. BACKGROUND

[0002] In a new energy vehicle equipped with a battery device, the battery device can be used to provide power in whole or in part. In the use process of the battery device, the battery monomer in the battery device will generate heat. If the heat is too high, it will adversely affect the performance and service life of the battery device.

[0003] In a type of battery device in the related art, the battery monomer is a soft package cell, a protection shell is arranged in the battery device to protect the soft package cell, and a cold plate is arranged to exchange heat with the soft package cell. Such a battery device has high weight and cost. SUMMARY

[0004] Therefore, embodiments of the present application aim to provide a battery device and an electric equipment.

[0005] A first aspect of embodiments of the present application provides a battery device, comprising: a box body; a battery monomer arranged in the box body; the battery monomer is arranged to include a shell and an electrode assembly, the electrode assembly is arranged in the shell, and the shell is arranged as a flexible shell; a protection shell, an internal cavity with at least one open side is formed, and at least one battery monomer is arranged in the cavity; and a flexible member, arranged in a stack with the protection shell, at least one medium flow channel is formed between the flexible member and the protection shell, the medium flow channel is used to guide a heat exchange medium to exchange heat with the battery monomer.

[0006] In the battery device of embodiments of the present application, the flexible member and the protection shell of the battery monomer are arranged in a stack to form a medium flow channel therebetween. In this way, the protection shell is formed as part of the heat exchange structure while playing a protection role, and the flexible member itself also has a small weight, thereby helping to reduce the overall weight of the battery device, improve the energy density, and reduce the cost. On the other hand, the flexible member has a certain flexibility, which can better fit the box body and / or the battery monomer, thereby helping to absorb assembly tolerances, eliminating the need for caulking agents or heat-conducting materials, improving the fit with the box body and / or the battery monomer, increasing the effective heat exchange area between the box body and / or the battery monomer, and thereby improving the heat exchange efficiency and heat exchange effect.

[0007] In some embodiments, the shell of the battery monomer is arranged as an aluminum plastic film.

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

[0009] In some embodiments, the box comprises a first wall for confining the battery cell, the cavity is open towards one side of the first wall and closed towards the other side of the first wall.

[0010] In the present embodiment, the protection and limiting of the battery cell are achieved by the cooperation of the protection shell and the first wall of the box, so that the overall weight of the protection shell can be reduced while better protection and supporting and limiting effects are obtained, and the energy density of the battery device is further improved.

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

[0012] In the present embodiment, the weight of the battery cell is borne by the first wall, so that the stress on the protection shell can be reduced, the service life of the protection shell is improved, and the assembly difficulty is also reduced.

[0013] In some embodiments, the cavity is open along opposite sides in a first direction and closed along opposite sides in 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 the present embodiment, by opening the cavity in the first direction and closing it in the second direction, on the one hand, the weight of the protection shell can be further reduced, and on the other hand, the expansion force of the battery cell in the first direction on the protection shell can be reduced, and the stress distribution of the protection shell in each direction is optimized, so that the probability of deformation of the protection shell is reduced.

[0015] In some embodiments, the first wall can exchange heat with the battery cell.

[0016] In the present embodiment, by setting the first wall to exchange heat with the battery cell, the heat exchange area can be further increased, and thus the heat management efficiency is improved.

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

[0018] In the present embodiment, by setting the protection shell to comprise a main body portion and a flange portion, the structure of the protection shell is simplified and its weight is further reduced.

[0019] In some embodiments, at least one of the flexible pieces is arranged in a stack with the main body portion.

[0020] In the embodiment, the at least one flexible piece is stacked with the main body part, which helps to increase the heat exchange area and thus the heat exchange effect.

[0021] In some embodiments, the at least one flexible piece is stacked with the flange part.

[0022] In the embodiment, the at least one flexible piece is stacked with the flange part, which helps to further increase the heat exchange area.

[0023] In some embodiments, the at least one flexible piece is arranged on the side of the protective shell away from the battery cell.

[0024] In the embodiment, the at least one flexible piece is arranged on the side of the protective shell away from the battery cell, which helps to improve the protection effect and the support limiting effect of the protective shell on the battery cell.

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

[0026] In the embodiment, the at least one flexible piece is arranged on the side of the protective shell facing the battery cell, which helps to improve the heat exchange effect.

[0027] In some embodiments, the side of the flexible piece facing the protective shell forms a flow channel groove, and the surface of the side of the protective shell facing the flexible piece is a plane.

[0028] In the embodiment, the flow channel groove is formed only on the flexible piece, and not on the protective shell, which helps to improve the structural strength of the protective shell and thus the protection effect and the support 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 the embodiment, the inlet and the outlet are arranged on the protective shell rather than on the flexible piece, so that the connecting piece for connecting the inlet and the outlet is connected with the protective shell, which helps to improve the connection strength of the connecting piece (the protective shell generally has high structural strength), and thus helps to improve the reliability of the heat exchange function.

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

[0032] In the embodiment, the metal plasticized film has a small thickness and weight, and the medium flow channel is formed between the metal plasticized film and the protective shell, which is not affected by the extrusion process and does not need to meet the requirement of a large thickness, so that the overall thickness and weight can be reduced.

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

[0034] The aluminum-plastic film has high barrier property, good cold stamping formability, puncture resistance, electrolyte resistance, and electrical insulation.

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

[0036] In this embodiment, the flexible member sequentially stacked by the metal layer and the non-metal layer has a small thickness and a small weight, is not affected by the extrusion process, does not need to meet a large thickness requirement, and thus the overall thickness and weight can be reduced. In addition, the flexible member does not react with the heat exchange medium flowing inside, and thus there is no possibility of corrosion leakage.

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

[0038] By setting the metal layer as one or more of an aluminum foil, a copper foil, and a steel foil, the flexible member can have a certain structural strength and can play an isolation role. By setting the non-metal layer as 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-metal layer is a hot melt layer.

[0040] In this embodiment, by setting the non-metal layer as a hot melt layer, i.e., the non-metal layer is composed of a hot melt material, the non-metal layer and the metal layer can be compounded together by hot melting, which is simple in forming and high in production efficiency.

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

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

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

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

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

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

[0047] In some embodiments, the protective shell is a metal member.

[0048] In this embodiment, by setting the protective shell as a metal member, the metal member has good structural strength and good heat conduction performance.

[0049] A second aspect of the embodiments of the present application provides a power consuming device comprising the battery device of the first aspect of the embodiments of the present application.

[0050] The power consuming device of the embodiments of the present application has all the advantages of the battery device as described in any of the above embodiments, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 Fig. 1 is a structural schematic diagram of a vehicle according to an embodiment of the present application;

[0052] Figure 2 Fig. 2 is a perspective exploded schematic diagram of a battery device according to an embodiment of the present application;

[0053] Figure 3 Fig. 3 is a connection schematic diagram of a protective shell and a flexible member according to an embodiment of the present application;

[0054] Figure 4 Fig. 4 is a perspective exploded schematic diagram of a protective shell and a flexible member according to an embodiment of the present application.

[0055] REFERENCE SIGNS

[0056] 1000, vehicle; 100, battery device; 10, box; 11, first sub-box; 12, second sub-box; 13, first wall; 20, battery monomer; 30, protective shell; 30a, inlet; 30b, outlet; 31, main body part; 32, flange part; 40, flexible member; 40a, medium flow channel; 50, connecting member; 200, controller; 300, motor. DETAILED DESCRIPTION

[0057] In order to make the purposes, technical solutions and advantages of the present application clearer, further, the present application will be described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0058] In the specific embodiments, various specific technical features described 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, various possible combinations of various specific technical features in the present application are not described again.

[0059] In the following description, the terms "first", "second", and the like are merely used to distinguish different objects, and do not indicate that the objects have the same or related relationship. It should be understood that the positional description "upper", "lower", "outer", "inner", "left", "right" are the positions in the normal use state, and the "left" and "right" directions represent the left and right directions shown in the specific corresponding schematic diagram, which can be the left and right directions in the normal use state or not.

[0060] It should be noted that the terms "comprise", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the sentence "comprises one" does not exclude the existence of other identical elements in the process, method, article or device including the element. "Multiple" means greater than or equal to two.

[0061] In the description of the embodiments of the present application, the positions or positional relationships indicated by the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential" and the like are based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed, operated or used in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0062] In the description of the present application, the "first direction", "second direction", "thickness direction of the first wall" orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, wherein the "first direction" is the direction indicated by arrow L1 in the drawings, the "second direction" is the direction indicated by arrow L2 in the drawings, and the "thickness direction of the first wall" is the direction indicated by arrow L3 in the 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 devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application.

[0063] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above-mentioned terms in the embodiments of the present application can be understood according to the specific circumstances.

[0064] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical term "contact" should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, and can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0065] If not specifically stated, all embodiments and optional embodiments of the present application can be combined to form new technical solutions.

[0066] If not specifically stated, all technical features and optional technical features of the present application can be combined to form new technical solutions.

[0067] With the development of clean energy, more and more equipment uses electric energy as driving energy, and then as power battery which can store more electric energy and can be charged and discharged repeatedly, such as lithium ion battery. Among them, the power battery is not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields.

[0068] In the embodiments of the present application, the battery cell is a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0069] 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-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0070] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator disposed between the negative electrode and the positive electrode. During the charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting while allowing the active ions to pass through.

[0071] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of a wound and a stacked structure.

[0072] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0073] In some embodiments, the electrode assembly is a stacked structure.

[0074] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately stacked.

[0075] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet is folded to form a plurality of folded segments that are stacked. One positive electrode sheet is clamped between adjacent folded segments.

[0076] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments that are stacked.

[0077] As an example, a plurality of separators can be provided, and each of the plurality of separators is disposed between any adjacent positive electrode sheet or negative electrode sheet.

[0078] As an example, the separators can be continuously provided and disposed between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0079] In some embodiments, the electrode assembly is provided with a tab. The tab can guide current out of the electrode assembly. The tab includes a positive tab and a negative tab.

[0080] The battery cell includes a housing. The housing can be provided as a flexible housing, for example, an aluminum plastic film.

[0081] Since the shell structure of the soft package battery has low strength, in the battery device provided with the soft package battery, a protective shell needs to be provided to protect the soft package battery. In addition, during use of the battery device, the soft package battery generates heat, and if the heat is too high, it will adversely affect the performance and service life of the battery device. In the related art, the protective shell is provided in the box to protect the soft package battery, and a cooling system is provided in the box to cool the soft package battery. The cooling system can include a plurality of aluminum water cooling plates arranged in the battery device box, and the surfaces of the plurality of water cooling plates are in contact with the surfaces of the soft package battery. During use, a heat exchange medium such as water flows through the plurality of water cooling plates, thereby taking away the heat on the soft package battery and cooling the soft package battery. The battery device has problems of large weight and high cost.

[0082] In view of this, in order to reduce the weight and cost of the battery device, the embodiments of the present application provide a battery device. The battery device includes a box, a battery monomer, a protective shell, and a flexible member. The battery monomer is arranged in the box, and the battery monomer includes a shell and an electrode assembly. The electrode assembly is arranged in the shell, the shell is arranged as a flexible shell, the protective shell forms an open cavity on at least one side inside, at least one battery monomer is arranged in the cavity, the flexible member is arranged in layers with the protective shell, at least one medium flow channel is formed between the flexible member and the protective shell, the medium flow channel is used to guide a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery monomer.

[0083] In the battery device of the embodiments of the present application, the flexible member and the protective shell of the battery monomer are arranged in layers to form a medium flow channel therebetween. In this way, the protective shell forms part of the heat exchange structure while playing a protective role, and the flexible member itself also has a small weight, thereby helping to reduce the overall weight of the battery device, improve the energy density, and reduce the cost. On the other hand, the flexible member has a certain flexibility and can better fit the box and / or the battery monomer, thereby facilitating absorption of assembly tolerances, eliminating the need for use of a caulking agent or a heat-conducting material, improving the fit with the box and / or the battery monomer, increasing the effective heat exchange area between the box and / or the battery monomer, and thereby improving the heat exchange efficiency and heat exchange effect.

[0084] The technical solutions described in the embodiments of the present application are applicable to an electric device using the battery device. The electric device includes the battery device of any of the embodiments of the present application, and the battery device is used to provide electric energy.

[0085] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game machine, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, etc. The electric device is not specially limited in the embodiments of the present application.

[0086] It should be noted that the technical solutions described in the embodiments of the present application are not only limited to the above-described battery device, but can also be applied to all electric devices including the battery device and energy storage equipment. However, for the sake of simplicity, the following embodiments will be described with reference to an electric vehicle.

[0087] With reference to Figure 1 The inside of the vehicle 1000 can be provided with a controller 200, a motor 300, and a battery device 100, and the controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be arranged at the bottom, the front, or the rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000, and is used for the circuit system of the vehicle 1000, for example, for the power demand of the vehicle 1000 during starting, navigation, and operation. In another embodiment of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0088] With reference to Figures 2-4 The battery device 100 of the embodiments of the present application includes a box body 10, a battery monomer 20, a protective shell 30, and a flexible member 40. The battery monomer 20 is arranged in the box body 10, the battery monomer 20 includes a shell and an electrode assembly (not shown in the figure), the electrode assembly is arranged in the shell, the shell is arranged as a flexible shell, the protective shell 30 forms at least one cavity with an open side inside, at least one battery monomer 20 is arranged in the cavity, the flexible member 40 is arranged in layers with the protective shell 30, 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 guide a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery monomer 20.

[0089] The box 10 can be a simple cuboid or cylinder or sphere structure, or a complex cuboid structure composed of simple cuboid or cylinder or sphere structures. The material of the box 10 can be an alloy material such as aluminum alloy or iron alloy, or a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0090] The box 10 is used to package the battery monomer, and the box 10 can avoid the influence of liquid or other foreign matters on the charging or discharging of the battery monomer.

[0091] As an example, the box 10 is generally a cuboid structure, the length direction and the width direction 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 cuboid structure of the box 10. The height direction of the box 10 is perpendicular to the ground.

[0092] As an example, referring to 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, and as an example, the first sub-box 11 is a top cover and the second sub-box 12 is a lower box,

[0093] The battery monomer 20 includes a shell and an electrode assembly, the electrode assembly is arranged in the shell, and the shell is arranged as a flexible shell. As an example, the shell is arranged as an aluminum plastic film or other metal plasticized film, or any other suitable flexible material, which is not limited.

[0094] The specific structure of the shell and the electrode assembly can refer to the description of the related part in the above, which will not be repeated here.

[0095] The battery device can include a plurality of battery monomers 20, at least a part of the battery monomers 20 can be distributed along a first direction, and / or at least a part of the battery monomers 20 can be distributed along a second direction, the first direction intersects the second direction, and taking the cuboid structure of the box 10 as an example, the first direction can be the length direction of the box 10, and the second direction can be the width direction of the box 10.

[0096] It can be understood that since the shell of the battery monomer 20 is a flexible shell, that is, the battery monomer 20 is a soft pack battery, the structural strength is relatively low, therefore, the battery device further includes a protective shell 30, the protective shell 30 is used to provide protection, limiting and other functions for the battery monomer 20.

[0097] Referring to Figures 2-4 , the protective shell 30 forms an open cavity inside, and at least one battery monomer 20 is arranged in the cavity.

[0098] Here, the cavity can be open on only one side or multiple sides, and no limitation is made thereto, and a person skilled in the art can determine the actual assembly requirements to determine the specific structure.

[0099] As mentioned above, the battery device 100 can include a plurality of battery cells 20, in which case the protective shell 30 can be arranged one-to-one with the battery cells 20, that is, only one battery cell 20 is arranged in one cavity, or one protective shell 30 can correspond to a plurality of battery cells 20, that is, a plurality of battery cells 20 are arranged in one cavity. In some embodiments, at least a portion of the protective shell 30 is located between adjacent battery cells 20.

[0100] The specific structure of the flexible member 40 is not limited, and as an example, the flexible member 40 is generally a plate structure.

[0101] Here, the flexibility of the flexible member refers to the material properties of the structure, and this type of property can be due to the light weight of the material, or due to at least any one of the thickness, rigidity, strength, elastic modulus, etc. of the material. As an example, the material of the flexible member can be selected to be a material with a lighter weight than a conventional aluminum plate, steel plate, etc. structure, and its flexibility can be controlled by the thickness, width, length, type of material of the flexible member.

[0102] By providing the flexible member 40, it is helpful to further reduce the weight of the battery device 100, and thus improve the energy density of the battery device 100.

[0103] Further, the flexible member 40 has certain expandable or contractible properties, and it can also be understood that the flexible member 40 can be an elastically deformable structure, which has the ability to deform and recover from deformation, so that the flexible member 40 can adapt to the external contour shape of the battery cell 20 or other components through certain elastic deformation, to improve its fit with the case 10 and / or the battery cell 20, thereby increasing the effective heat exchange area, and thus improving the heat exchange efficiency.

[0104] It can be understood that the flexible member 40 and the shell of the battery cell 20 are both flexible structures, and their materials can be the same or different.

[0105] In some embodiments, the protective shell 30 is configured as a rigid member, where the rigidity of the rigid member refers to the material properties of the structure, which can be due to the mass of the material, or due to at least one of the thickness, rigidity, strength, modulus of elasticity, etc. of the material. As an example, the material of the rigid member can be a metal plate such as a conventional aluminum plate, a steel plate, or a structural material such as a composite plate, and the rigidity can be controlled by the thickness, width, length, and type of the material.

[0106] The flexible member 40 is stacked with the protective shell 30, where the stacking refers to the distribution of the flexible member 40 and the protective shell 30 along a stacking direction, and when projected onto the same projection plane along the stacking direction, the projection of the flexible member 40 at least partially overlaps with the projection of the protective shell 30.

[0107] The stacking direction of the flexible member 40 and the protective shell 30 is not limited, and as an example, at least one flexible member 40 and the protective shell 30 are stacked along the height direction (the thickness direction of the first wall), and / or at least one flexible member 40 and the protective shell 30 are stacked along the first direction, and / or at least one protective member and the protective shell 30 are stacked along the second direction.

[0108] At least one flexible member 40 is arranged on the side of the protective shell 30 away from the battery monomer 20, and / or at least one flexible member 40 is arranged on the side of the protective shell 30 facing the battery monomer 20.

[0109] The specific connection between the flexible member 40 and the protective shell 30 is not limited, and can be adhesion, welding, etc.

[0110] 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 forms at least part of the side wall of the medium flow channel 40a, and the protective shell 30 also forms at least part of the side wall of the medium flow channel 40a. The heat exchange medium flows through the medium flow channel 40a to exchange heat with the battery monomer 20.

[0111] 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 flat surface, which forms the medium flow channel 40a together with the flow channel groove. 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 flat surface, which forms the medium flow channel 40a together with the flow channel groove. Alternatively, the surfaces of the flexible member 40 and the protective shell 30 facing each other are both recessed to form flow channel grooves, and the flow channel grooves of the flexible member 40 and the protective shell 30 form the medium flow channel 40a together.

[0112] The medium flow channel 40a is used to guide the heat exchange medium. It should be noted that the specific type of the heat exchange medium is not limited herein, and the heat exchange medium can be gaseous or liquid, for example, and can have a heat exchange effect on the battery monomer 20.

[0113] The specific number of the medium flow channel 40a is not limited herein. There can be one or multiple.

[0114] As an example, referring to Figure 4 , the flexible member 40 and the protective shell 30 each have an inlet 30a and an outlet 30b, which are in communication with 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 can form the inlet 30a and / or the outlet 30b, or the flexible member 40 can form the inlet 30a and / or the outlet 30b.

[0115] As an example, referring to Figure 3 and Figure 4 , the battery device 100 further includes a connecting member 50 in communication with the inlet 30a and a connecting member 50 in communication with the outlet 30b. As an example, the connecting member 50 includes a water nozzle. As an example, the inlet 30a and the outlet 30b are formed in the protective shell 30, and the connecting member 50 is brazed to the protective shell 30.

[0116] The heat exchange structure composed of the flexible member 40 and the protective shell 30 has the following principle for heat exchange of the battery monomer 20: The heat exchange medium output by a heat exchange medium source (not shown in the figure) enters the medium flow channel 40a through the inlet 30a, exchanges heat with the battery monomer 20, and then flows out through the outlet 30b, thereby completing the heat exchange of the battery monomer 20.

[0117] Here, the heat exchange of the battery monomer 20 can be cooling or heating of the battery monomer 20.

[0118] The heat exchange structure has the following principle for cooling of the battery monomer 20: The heat exchange medium output by the heat exchange medium source enters the medium flow channel 40a through the inlet 30a, absorbs the heat generated during the operation of the battery monomer 20, and then flows out through the outlet 30b to release the heat, thereby completing the cooling of the battery monomer 20.

[0119] The heat exchange structure has the following principle for heating of the battery monomer 20: The heat exchange medium output by the heat exchange medium source enters the medium flow channel 40a through the inlet 30a, transfers heat to the battery monomer 20, and then flows out through the outlet 30b, thereby completing the heating of the battery monomer 20.

[0120] It should be noted that since the protective shell 30 is located between the battery monomer 20 and the box body 10, the heat exchange structure described above can not only exchange heat with the battery monomer 20, but also exchange heat with the box body 10.

[0121] In the battery device 100 of the embodiment, the flexible member 40 and the protective shell 30 of the battery monomer 20 are stacked to form a medium flow channel 40a therebetween. In this way, the protective shell 30 functions as protection and forms part of the heat exchange structure, and the flexible member 40 itself has a small weight, thereby helping to reduce the overall weight of the battery device 100, improve the energy density, and reduce the cost. On the other hand, the flexible member has a certain flexibility and can better fit the box body and / or the battery monomer, thereby facilitating the absorption of assembly tolerances, eliminating the need for caulking agents or heat-conducting materials, improving the fit with the box body and / or the battery monomer, increasing the effective heat exchange area between the box body and / or the battery monomer, and thereby improving the heat exchange efficiency and heat exchange effect.

[0122] In some embodiments, the shell of the battery monomer 20 is an aluminum plastic film.

[0123] The aluminum plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation, which helps to improve the use reliability of the battery monomer 20.

[0124] In one specific embodiment, referring to Figure 2 The box body 10 includes a first wall 13 for restraining the battery monomer, and the cavity is open on the side facing the first wall 13 and closed on the side facing away from the first wall 13.

[0125] Here, the first wall 13 can be any wall of the box body 10 that can restrain the battery monomer 20. For example, in the case of a cuboid box body 10, the first wall 13 can be a wall in the length direction, a wall in the width direction, or a wall in the height direction, without limitation.

[0126] The cavity is open on the side facing the first wall 13 and closed on the side facing away from the first wall 13, so that the protective shell 30 can jointly protect and restrain the battery monomer 20 with the first wall 13.

[0127] In this embodiment, the cavity can be open or closed in other directions, without limitation.

[0128] In this embodiment, the protection and positioning of the battery monomer 20 are achieved by the cooperation of the protective shell 30 and the first wall 13 of the box body 10. In this way, the overall weight of the protective shell 30 can be reduced while achieving good protection and support positioning, further improving the energy density of the battery device.

[0129] In some embodiments, specifically, the first wall 13 is configured to carry the battery cell 20.

[0130] Here, the first wall 13 configured to carry the battery cell 20 specifically means that the first wall 13 is configured to carry at least part of the weight of the battery cell 20, in other words, at least part of the first wall 13 is located at the bottom side of the battery cell 20, as an example, the first wall 13 includes the bottom plate and / or the bottom guard plate of the box 10.

[0131] In the present embodiment, the weight of the battery cell 20 is carried by the first wall 13, so that the stress of the protective shell 30 can be reduced, the service life of the protective shell 30 is improved, and the assembly difficulty is also reduced.

[0132] In some embodiments, with reference to Figure 2 , the cavity is open on opposite sides along the first direction and closed on 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.

[0133] In the present embodiment, the protective shell 30 is actually formed as a U-shaped shell structure.

[0134] Taking the box 10 as a cuboid structure and the first wall 13 configured to carry the battery cell 20 as an example, the thickness direction of the first wall 13 is the height direction of the box 10, the first direction can be one of the length direction and the width direction of the box 10, and the second direction can be the other one of the length direction and the width direction of the box 10.

[0135] In the present embodiment, by making the cavity open in the first direction and closed in the second direction, on the one hand, the weight of the protective shell 30 can be further reduced, and on the other hand, the protective shell 30 can be protected from the expansion force of the battery cell 20 along the first direction, so that the stress distribution of the protective shell 30 in each direction is optimized, and thus the probability of deformation of the protective shell 30 is reduced.

[0136] In some embodiments, specifically, the box 10 includes a plurality of battery cells 20 distributed along the first direction, and the first direction is perpendicular to the large face of the battery cell 20.

[0137] Here, the large face refers to the largest face among the surfaces of the battery cell 20. It can be understood that in such an embodiment, the expansion force of the battery cell 20 is mainly along the first direction, and the protective shell 30 is open on both sides in the first direction, so that the expansion force of the battery cell 20 received by the protective shell 30 can be further reduced.

[0138] In some embodiments, the first wall 13 can exchange heat with the battery cell 20.

[0139] The specific implementation of the first wall 13 exchanging heat with the battery cell 20 is not limited, as an example, the first wall 13 can 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 can be formed inside the first wall 13, the flow channel is used to guide the heat exchange medium for heat exchange with the battery cell 20, here, the heat exchange medium can be the same as the heat exchange medium in the medium flow channel 40a described above, or it can be different. In some examples, the flow channel inside the first wall 13 can be in communication with the above-mentioned medium flow channel 40a.

[0140] In this embodiment, by setting the first wall 13 to exchange heat with the battery cell 20, the heat exchange area can be further increased, thereby improving the heat management efficiency.

[0141] In some embodiments, referring to Figures 2-4 The protective shell 30 includes a main body portion 31 and at least one flange portion 32 connected to the main body portion 31, the main body portion 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.

[0142] As an example, the main body portion 31 and the flange portion 32 are both generally plate-shaped structures, the main body portion 31 can only cover part of the battery cell 20, or can completely cover the battery cell 20, and the flange portion 32 is the same.

[0143] The specific connection mode of the main body portion 31 and the flange portion 32 is not limited, which can be adhesion, welding, fastener connection, etc., or the main body portion 31 and the flange portion 32 are formed as an integral structure.

[0144] In this embodiment, by setting the protective shell 30 to include the main body portion 31 and the flange portion 32, it is helpful to simplify the structure of the protective shell 30 and further reduce its weight.

[0145] In some embodiments, at least one flexible member 40 is arranged in a stack with the main body portion 31.

[0146] Here, the at least one flexible member 40 can be arranged on the side of the main body portion 31 facing the battery cell 20, or on the side of the main body portion 31 away from the battery cell 20, or on both sides of the main body portion 31.

[0147] In this embodiment, by arranging the at least one flexible member 40 in a stack with the main body portion 31, it is helpful to increase the heat exchange area and further improve the heat exchange effect.

[0148] In some embodiments, at least one flexible member 40 is arranged in a stack with the flange portion 32.

[0149] In the embodiment, the flexible member 40 can be arranged on the side of the turned-up portion 32 facing the battery monomer 20, or on the side of the turned-up portion 32 away from the battery monomer 20, and no limitation is made in this regard.

[0150] In the embodiment, by arranging at least one flexible member in a stack with the turned-up portion 32, the heat exchange area is further increased.

[0151] In some embodiments, referring to Figures 2-4 , at least one flexible member 40 is arranged on the side of the protective shell 30 away from the battery monomer 20.

[0152] Here, the side of the protective shell 30 away from the battery monomer 20 can refer to the side of any part of the protective shell 30 away from the battery monomer 20.

[0153] In the case where the number of flexible members 40 is multiple, only a part of the flexible members 40 can be arranged on the side of the protective shell 30 away from the battery monomer 20, or all of the flexible members 40 can be arranged on the side of the protective shell 30 away from the battery monomer 20.

[0154] It can be understood that, compared with the flexible member 40, the protective shell 30 generally has higher structural strength, especially in the embodiment where the flexible member 40 is arranged as a flexible member. Therefore, in the embodiment, by arranging at least one flexible member 40 on the side of the protective shell 30 away from the battery monomer 20, the protection effect and the support and limiting effect of the protective shell 30 on the battery monomer 20 are improved.

[0155] In some embodiments, at least one flexible member 40 is arranged on the side of the protective shell 30 facing the battery monomer 20.

[0156] Here, the side of the protective shell 30 facing the battery monomer 20 can refer to the side of any part of the protective shell 30 facing the battery monomer 20.

[0157] In the case where the number of flexible members 40 is multiple, only a part of the flexible members 40 can be arranged on the side of the protective shell 30 facing the battery monomer 20, or all of the flexible members 40 can be arranged on the side of the protective shell 30 facing the battery monomer 20.

[0158] It can be understood that, compared with the protective shell 30, the flexible member 40 generally has better heat conduction performance, for example, the heat conduction coefficient of the flexible member 40 is higher than that of the protective shell 30, and for another example, in the embodiment where the flexible member 40 is arranged as a flexible member, the flexible member can have a larger contact area and / or a more closely fitted contact with the battery monomer 20.

[0159] Therefore, in the embodiment, by arranging at least one flexible member 40 on the side of the protective shell 30 facing the battery monomer 20, the heat exchange effect is improved.

[0160] In some embodiments, there are multiple flexible members 40, at least one flexible member 40 is arranged on the side of the protective shell 30 facing the battery monomer 20, and at least one flexible member 40 is arranged on the side of the protective shell 30 away from the battery monomer 20, so that the volume of the heat exchange medium that the medium flow channel 40a can accommodate can be increased, and a better heat exchange effect can be obtained.

[0161] In some embodiments, at least one of the flexible member 40 and the protective shell 30 forms a flow channel groove on the side facing the other, and the flow channel groove and the other of the flexible member 40 and the protective shell 30 form the medium flow channel 40a.

[0162] As mentioned above, only one of the flexible member 40 and the protective shell 30 can form a flow channel groove, and the surface of the other facing the flow channel groove is a plane, or both the flexible member 40 and the protective shell 30 can form a flow channel groove.

[0163] The flow channel groove can be formed in the flexible member 40 and / or the protective shell 30 by stamping, etching, injection molding, etc., and is not limited in this regard.

[0164] In this embodiment, the medium flow channel 40a is formed between the flexible member 40 and / or the protective shell 30 by forming a flow channel groove in the flexible member 40 and / or the protective shell 30. This arrangement helps to form a medium flow channel 40a with a regular cross-sectional shape, thereby increasing the flow rate of the heat exchange medium in the medium flow channel 40a and reducing the flow resistance, thereby improving the heat exchange efficiency. In addition, this arrangement helps to reduce the occupation of the space in the box 10, thereby helping to improve the energy density of the battery device 100.

[0165] It should be noted that the formation of the medium flow channel 40a is not limited in this regard. For example, in the embodiment in which the flexible member 40 is a flexible member, the flexible member 40 can be fixedly connected to the protective shell 30 in some areas and not fixedly connected to the protective shell 30 in other areas. The flexible member in the unfixed area will form a gap between the protective shell 30 after the heat exchange medium is introduced, and this gap is the medium flow channel 40a. For another example, the flexible member 40 can be arranged in a spaced manner with the protective shell 30 to form the medium flow channel 40a.

[0166] In some embodiments, the side of the flexible member 40 facing the protective shell 30 forms a flow channel groove, and the surface of the side of the protective shell 30 facing the flexible member 40 is a plane.

[0167] In this embodiment, only the flexible member 40 forms a flow channel groove, and the protective shell 30 does not form a flow channel groove, which helps to improve the structural strength of the protective shell 30, thereby improving the protection effect and support limiting effect of the protective shell 30.

[0168] In some embodiments, the protective shell 30 has an inlet 30a and an outlet 30b communicating with the medium flow channel 40a.

[0169] In this embodiment, the inlet 30a and the outlet 30b are provided 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.

[0170] In some embodiments, the flexible member 40 and the protective shell 30 are hot-pressed to form a hot-pressed region, and the hot-pressed region separates the flexible member and the protective shell 30 to form at least one medium flow channel 40 a.

[0171] 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.

[0172] In some embodiments, the width of the heat-pressed area is 0.5 mm to 5 mm.

[0173] For example, it is any one of the point values ​​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.

[0174] It is understandable that in some cases, different medium flow channels 40a are separated by hot pressing areas. Therefore, hot pressing areas of sufficient width are conducive to ensuring the sealing of the medium flow channels 40a, that is, to ensuring the reliability of the medium flow channels 40a.

[0175] 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 helps to improve the coverage rate of the medium flow channel 40 a, thereby improving the heat exchange efficiency.

[0176] In some embodiments, the width of the heat-pressed area is 2 mm to 3 mm.

[0177] For example, it may be any one 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, etc.

[0178] In the embodiment, by setting the width of the hot-pressing region to 2-3 mm, the reliability of the medium flow channel 40a of the flexible member 40 is improved, and the coverage of the medium flow channel 40a is further improved, thereby further improving the heat exchange efficiency.

[0179] In some embodiments, the flexible member 40 comprises a metal plasticized film.

[0180] The flexible member 40 is a single-layer or multi-layer film.

[0181] Here, the metal plasticized film is a metal plastic composite material, that is, it comprises a metal layer and a plastic layer, and the plastic layer forms the above-mentioned insulating layer.

[0182] In the embodiment, the metal plasticized film has a small thickness and weight, and the medium flow channel 40a is formed between the metal plasticized film and the protective shell 30, which is not affected by the extrusion process and does not need to meet the requirement of a large thickness, so the overall thickness and weight can be reduced.

[0183] In some embodiments, the flexible member 40 comprises an aluminum plastic film.

[0184] The aluminum plastic film has high barrier property, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0185] In some embodiments, the flexible member 40 has a layered structure, and comprises a metal layer and a non-metal layer, and the metal layer and the non-metal layer are sequentially stacked.

[0186] Here, the flexible member 40 comprises a metal layer and a non-metal layer, that is, it is a composite material piece composed of a metal layer and a non-metal layer.

[0187] As an example, the metal layer and the non-metal layer can be formed by hot pressing or hot melting.

[0188] The number of the metal layer and the non-metal layer is not limited.

[0189] In the embodiment, the flexible member 40 sequentially stacked by the metal layer and the non-metal layer has a small thickness and weight, is not affected by the extrusion process, and does not need to meet the requirement of a large thickness, so the overall thickness and weight can be reduced. In addition, the flexible member 40 does not react with the heat exchange medium flowing inside, so there is no possibility of corrosion and leakage.

[0190] In some embodiments, the metal layer comprises one or more of an aluminum foil, a copper foil, and a steel foil.

[0191] By setting the metal layer to be one or more of an aluminum foil, a copper foil, and a steel foil, the flexible member 40 has a certain structural strength and can play an isolation role.

[0192] In some embodiments, the non-metallic layer comprises one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0193] By setting the non-metallic layer to be one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene, the flexible piece 40 can have a certain waterproof effect.

[0194] As an example, the non-metallic layer can also be selected to be a corrosion-resistant material with acid and alkali corrosion resistance, or in other words, the non-metallic layer is added with an additive to have acid and alkali corrosion resistance.

[0195] In some embodiments, the non-metallic layer is a hot melt layer.

[0196] In this embodiment, by setting the non-metallic layer to be a hot melt layer, i.e., being composed of a hot melt material, it is beneficial to be hot melted to make the non-metallic layer and the metal layer composite together, and the molding is simple and the production efficiency is high.

[0197] In some embodiments, the thickness of the flexible piece 40 is 0.05mm-0.3mm.

[0198] As an example, the thickness of the flexible piece 40 is any one of 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.15mm, 0.2mm, 0.21mm, 0.22mm, 0.25mm, 0.27mm, 0.28mm, 0.3mm or a point value between any two of them.

[0199] In this embodiment, by setting the thickness of the flexible piece 40 to be 0.05mm-0.3mm, it has a certain structural strength while making the overall thickness of the protective shell 30 and the flexible piece 40 smaller, which is beneficial to reduce the overall volume and weight of the battery device 100 to increase the energy density of the battery device 100.

[0200] In some embodiments, the thickness of the flexible piece 40 is 0.08mm-0.2mm.

[0201] As an example, the thickness of the flexible piece 40 is any one of 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm or a point value between any two of them.

[0202] In the embodiment, the thickness of the flexible member 40 is set to 0.08-0.2 mm, so that the overall thickness of the protective shell 30 and the flexible member 40 is small while the flexible member 40 has a certain structural strength, which is conducive to reducing the overall volume and weight of the battery device 100 to increase the energy density of the battery device 100.

[0203] In some embodiments, the elastic modulus of the flexible member 40 is 0.1-10000 MPa.

[0204] For example, the elastic modulus of the flexible member 40 can be a point value of 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, 10000 MPa or a point value between any two of them.

[0205] The elastic modulus describes the size of the unit strain caused by the unit stress when the solid is stressed within a certain range, and is one of the basic physical quantities of the material. The greater the elastic modulus, the greater the stiffness of the material and the stronger the compression resistance. The elastic modulus is a physical quantity that describes the elasticity of a substance.

[0206] The measurement method of the elastic modulus of the flexible member 40 can include at least one of a static tensile test method, a dynamic test method, a sound velocity method, a nanoindentation method, and a bending method. The measuring instrument can include a nanoindenter and a universal testing machine.

[0207] For example, the elastic modulus of the flexible member 40 can be measured by the nanoindentation method at room temperature and pressure. The nanoindentation method uses a small indenter to make an indentation on the surface of the flexible member 40, and calculates the elastic modulus by analyzing the relationship between the indentation depth and the load.

[0208] In the embodiment, the elastic modulus of the flexible member 40 is set to 0.1-10000 MPa, so that the flexible member 40 has a certain structural strength to improve the use reliability, and also has a certain deformation ability, which can improve the adhesion to the box body 10 and / or the battery monomer 20, thereby increasing the effective heat exchange area and improving the heat exchange efficiency and heat exchange effect.

[0209] In some embodiments, the flexible member 40 has a breaking elongation greater than the breaking elongation of the protective shell 30. The breaking elongation is a percentage index of the elongation of a material when it is stretched to break. It is used to measure the deformation capacity that a material can withstand during stretching, i.e. the breaking elongation indicates the ductility of the material when it is stretched under force.

[0210] The breaking elongation of the flexible member 40 is greater than the breaking elongation of the protective shell 30, in other words, the ductility of the flexible member 40 is greater than the ductility of the protective shell 30 when stretched under force.

[0211] In some embodiments, the breaking elongation of the flexible member 40 is in the range of 30% to 300%.

[0212] The breaking elongation of the flexible member 40 can be a point value of any one of 30%, 50%, 60%, 80%, 90%, 100%, 130%, 150%, 160%, 170%, 190%, 200%, 220%, 150%, 260%, 280%, 290%, 300% or a point value between any two of them.

[0213] In this embodiment, by setting the breaking elongation of the flexible member 40 in the range of 30% to 300%, the flexible member 40 can have a certain impact resistance and puncture resistance while having a certain structural strength.

[0214] In some embodiments, the breaking elongation of the protective shell 30 is in the range of 1% to 50%.

[0215] The breaking elongation of the protective shell 30 can be a point value of 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 a point value between any two of them.

[0216] In this embodiment, by setting the breaking elongation of the protective shell 30 in the range of 1% to 50%, the protective shell 30 can have sufficient structural strength, thereby facilitating improvement of its protection effect.

[0217] In some embodiments, the protective shell 30 is set as a metal member.

[0218] As an example, the protective shell 30 can be an aluminum alloy plate, and the outer surface thereof can be insulated.

[0219] In this embodiment, by setting the protective shell 30 as a metal member, the metal member has both good structural strength and good heat conduction performance.

[0220] In some embodiments, the protective shell 30 is provided as an aluminum alloy piece.

[0221] The battery device 100 provided by the embodiments of the present application is further described below with reference to a specific embodiment.

[0222] With reference to Figures 2-4 The battery device 100 includes a box body 10, a battery cell 20, a protective shell 30, and a flexible piece 40.

[0223] 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 provided as a flexible shell.

[0224] The protective shell 30 is provided as a rigid piece, more specifically, as a metal piece. The protective shell 30 is arranged in one-to-one correspondence with the battery cell 20.

[0225] 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, the cavity is open on a side facing the first wall 13, is closed on a side facing away from the first wall 13, is open on opposite sides along a first direction, and is closed on opposite sides along a second direction, the first direction and the second direction are perpendicular to a thickness direction of the first wall 13.

[0226] The protective shell 30 includes a main body part 31 and two flange parts 32 connected to the main body part 31, the main body part 31 covers at least part of the battery cell 20 from a side of the battery cell 20 facing away from the first wall 13. The two flange parts 32 are connected to opposite sides of the main body part 31 along the second direction, the flange part 32 extends towards the first wall 13 and covers at least part of the battery cell 20 along the second direction.

[0227] The flexible piece 40 is arranged in a stack with the protective shell 30, and at least one medium flow channel 40a is formed between the flexible piece 40 and the protective shell 30, the medium flow channel 40a is used to guide a heat exchange medium to exchange heat with the battery cell 20.

[0228] The flexible piece 40 is specifically arranged on a side of the main body part 31 of the protective shell 30 facing away from the battery cell 20.

[0229] The embodiments of the present application also provide an electric device, and the electric device includes the battery device 100 as described in any one of the above embodiments.

[0230] The electric device of the embodiments of the present application has all the advantages of the battery device 100 as described in any one of the above embodiments, which will not be described herein again.

[0231] In the description of this application, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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 this application, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine different embodiments or examples described in this application and features of different embodiments or examples without contradiction.

[0232] The foregoing description is merely a preferred embodiment of the present application and is not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery device, characterized in that: include: Box; A battery cell is disposed in the box; the battery cell includes a shell and an electrode assembly, the electrode assembly is disposed in the shell, and the shell is configured as a flexible shell; A protective shell having a cavity formed therein with at least one side open, at least one battery cell disposed in the cavity, a plurality of protective shells, each of which has a battery cell disposed in its accommodating cavity, at least a portion of the protective shell being located between adjacent battery cells, and the protective shell being formed into a U-shaped shell structure; a flexible member stacked with the protective shell, forming at least one medium flow channel between the flexible member and the protective shell, the medium flow channel being used to conduct a heat exchange medium, the heat exchange medium being used to exchange heat with the battery cell, the flexible member and the protective shell being hot-pressed to form a hot-pressed region, the hot-pressed region separating the flexible member from the protective shell to form the at least one medium flow channel; The flexible member comprises an aluminum-plastic film, is a layered structure, comprises a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

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

3. The battery device according to claim 1, wherein: The box body includes a first wall, the first wall is used to constrain the battery cell, the cavity is open on a side facing the first wall, and is 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, wherein: 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 includes a main body and at least one flange portion connected to the main body, wherein the main body and the flange portion enclose 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, wherein: 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, wherein: At least one flexible member is disposed on a side of the protective shell facing the battery cell.

12. The battery device according to claim 1, wherein: 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.

13. The battery device according to claim 1, wherein: 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 metal layer is aluminum foil; and / or, The non-metallic layer includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene.

15. The battery device according to any one of claims 1 to 13, characterized in that The non-metallic layer is a hot-melt layer.

16. 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.

17. The battery device according to claim 16, characterized in that The thickness of the flexible member is 0.08 mm to 0.2 mm.

18. 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.

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

20. An electrical device, characterized in that: The electrical equipment comprises the battery device according to any one of claims 1-19.

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