Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device. The battery device comprises a box body, an electrode assembly, a cover body and at least one vapor chamber, the at least one vapor chamber is arranged in the accommodating space of the box body and divides the accommodating space into a plurality of sub-spaces, a second opening is formed in one end, facing the first opening of the box body, of each sub-space, and at least one electrode assembly is accommodated in each sub-space; the cover body is connected with the vapor chamber and seals the second opening, the electrode terminal arranged on the cover body is electrically connected with the electrode assembly, and a vapor chamber medium in the sub-space and the vapor chamber only needs to pass through one side wall thickness of the vapor chamber for heat exchange, so that the temperature uniformity in the sub-space can be improved, the reliability of the battery device is improved, and the service life of the battery device is prolonged; the heat exchange efficiency is higher, the soaking plate forms a shell of the electrode assembly and also plays a role in adjusting the internal temperature of the battery device, the structure of the battery device is simplified, the cost of the battery device is reduced, and the energy density of the battery device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery device and a power utilization device. BACKGROUND

[0002] With the vigorous development of new energy technology, the application field of batteries is wider and wider, and the capacity of batteries is larger and larger. In order to form a large-capacity battery, a plurality of battery monomers are connected in series or in parallel or in a mixed manner to form a battery module, which is then loaded into a box to form a battery pack. For a large-capacity battery pack, higher requirements are put forward for the reliability of the battery device. CONTENT OF THE UTILITY MODEL

[0003] The embodiments of the present application provide a battery device and a power utilization device, which can improve the reliability of the battery device.

[0004] In a first aspect, the embodiments of the present application provide a battery device, comprising a box, an electrode assembly, a cover and at least one heat plate; the box has a containing space, one end of the containing space forms a first opening; the at least one heat plate is arranged in the containing space and divides the containing space into a plurality of subspaces, one end of the subspaces towards the first opening forms a second opening, and each of the subspaces contains at least one electrode assembly; the cover is connected with the heat plate and closes the second opening, the cover is provided with an electrode terminal, and the electrode terminal is electrically connected with the electrode assembly.

[0005] In the above technical solution, the containing space of the box is divided into a plurality of subspaces by the heat plate, and the electrode assembly is contained in the subspace. In the charging and discharging process of the battery device, the heat exchange between the interior of the subspace and the heat medium in the heat plate can reduce the temperature difference of each region of the subspace, improve the uniformity of the temperature in the subspace, reduce the risk of thermal runaway caused by local overheating of the battery device, and even lead to explosion or fire of the battery device, and improve the reliability of the battery device. The uniform temperature distribution in the subspace is also conducive to the more uniform stress distribution of the electrode assembly, delays the aging of the battery device, and prolongs the service life of the battery device. By dividing the containing space of the box into a plurality of subspaces by the heat plate, the heat exchange between the subspace and the heat medium in the heat plate can only need to pass through the thickness of one side wall of the heat plate, so that the heat transfer path is shorter and the heat exchange efficiency is higher, thereby the temperature regulation efficiency of the interior of the subspace is higher. By dividing the containing space of the box into a plurality of subspaces by the heat plate and arranging the electrode assembly in the subspace, the heat plate not only forms the shell of the electrode assembly, but also plays a role in regulating the temperature in the battery device. Therefore, the battery device can not need to separately set a shell for the electrode assembly, which simplifies the structure of the battery device and reduces the weight of the battery device, and is conducive to reducing the cost of the battery device and improving the energy density of the battery device.

[0006] In some embodiments of the first aspect of the present application, the battery device comprises a plurality of heat plates, and the plurality of heat plates divide the accommodation space into a plurality of subspaces.

[0007] In the above technical solution, the accommodation space is divided into a plurality of subspaces by a plurality of heat plates, so that the area of the subspaces for adjusting the temperature inside the battery device is larger, which is conducive to improving the efficiency of temperature adjustment and further improving the uniformity of the temperature inside the subspaces.

[0008] In some embodiments of the first aspect of the present application, the plurality of heat plates comprises a plurality of first heat plates, and the plurality of first heat plates are arranged at intervals along a first direction.

[0009] In the above technical solution, the plurality of heat plates comprises a plurality of first heat plates arranged at intervals along a first direction, so that the plurality of first heat plates collectively adjust the temperature inside the battery device, which is conducive to improving the efficiency of temperature adjustment and further improving the uniformity of the temperature inside the subspaces.

[0010] In some embodiments of the first aspect of the present application, the plurality of heat plates comprises a plurality of second heat plates, the plurality of second heat plates are arranged at intervals along a second direction, the second heat plates are arranged transversely to the first heat plates, the first heat plates and the second heat plates collectively divide the accommodation space into a plurality of subspaces, and the first direction intersects the second direction.

[0011] In the above technical solution, the accommodation space is divided into a plurality of subspaces by a plurality of first heat plates arranged at intervals along a first direction and a plurality of second heat plates arranged at intervals along a second direction, so that the first heat plates and the second heat plates arranged transversely can collectively adjust the temperature inside the battery device, which is conducive to improving the efficiency of temperature adjustment and further improving the uniformity of the temperature inside the subspaces.

[0012] In some embodiments of the first aspect of the present application, the heat plate comprises a plate body and a heat medium, a heat cavity is formed inside the plate body, the heat medium is accommodated in the heat cavity, and the heat cavities of any two heat plates are not connected.

[0013] In the above technical solution, the heat cavities of any two heat plates are not connected, so that each heat plate is an independent individual, which is convenient for flexible arrangement of the heat plates and convenient for maintenance and replacement of the heat plates. After some heat plates are damaged, only the damaged heat plates need to be repaired or replaced, which reduces the difficulty and cost of maintenance.

[0014] In some embodiments of the first aspect of the present application, the first vapor chamber is provided with a first clamping groove, the second vapor chamber is provided with a second clamping groove, the first vapor chamber is clamped into the second clamping groove, and the second vapor chamber is clamped into the first clamping groove, so as to achieve the cross arrangement of the first vapor chamber and the second vapor chamber.

[0015] In the above technical solution, the first vapor chamber is clamped into the second clamping groove of the second vapor chamber, and the second vapor chamber is clamped into the first clamping groove of the first vapor chamber, so as to facilitate the cross arrangement of the first vapor chamber and the second vapor chamber. After the cross arrangement, the first vapor chamber and the second vapor chamber can restrict each other, thereby improving the connection stability of the first vapor chamber and the second vapor chamber.

[0016] In some embodiments of the first aspect of the present application, the thermal conductivity of the vapor chamber is greater than or equal to 2000 W / (m.K).

[0017] In the above technical solution, the thermal conductivity of the vapor chamber is greater than or equal to 2000 W / (m.K), so that the vapor chamber has good heat conduction capacity, thereby facilitating the improvement of the efficiency of the vapor chamber in regulating the temperature inside the sub-space.

[0018] In some embodiments of the first aspect of the present application, the thickness of any position of the vapor chamber is greater than or equal to 1 mm and less than or equal to 5 mm.

[0019] In the above technical solution, by setting the thickness of any position of the vapor chamber to be greater than or equal to 1 mm, the vapor chamber has high strength, thereby improving the impact resistance of the vapor chamber. By setting the thickness of any position of the vapor chamber to be less than or equal to 5 mm, the temperature of the vapor chamber is controlled within a reasonable range, the space occupied by the vapor chamber is reduced, and the internal space of the box can be used more for accommodating the electrode assembly, thereby facilitating the improvement of the energy density of the battery device.

[0020] In some embodiments of the first aspect of the present application, the box includes a box bottom wall, the box bottom wall supports the electrode assembly and the vapor chamber; a flow channel is formed inside the box bottom wall, and the flow channel is used to accommodate a fluid medium to manage the temperature in the sub-space.

[0021] In the technical solution, the flow channel is formed in the bottom wall of the box body, and the flow channel contains the fluid medium. Therefore, heat exchange can be performed between the fluid medium in the flow channel and the space inside the box body, so that the temperature inside the box body is increased or decreased, and the battery device can work normally, and the reliability of the battery device is improved. The bottom wall of the box body not only supports and protects the electrode assembly, but also manages the temperature inside the box body. Therefore, the battery device does not need to separately provide a temperature management structure at the bottom of the electrode assembly, the structure of the battery device is simplified, the weight of the battery device is reduced, the cost of the battery device is reduced, and the energy density of the battery device is improved. The bottom wall of the box body and the heat spreading plate jointly manage the temperature inside the box body, so that the temperature inside the battery device is in a reasonable range, the reliability of the battery device is improved, the temperature inside the box body is uniformly distributed, the service life of the battery device is prolonged, and the reliability of the battery device is further improved.

[0022] In some embodiments of the first aspect of the application, along the thickness direction of the bottom wall of the box body, the bottom wall of the box body comprises a first wall and a second wall arranged in layers, the first wall and the second wall jointly define the flow channel, the first wall is closer to the electrode assembly than the second wall, and the wall thickness of the second wall is greater than the wall thickness of the first wall.

[0023] In the technical solution, the wall thickness of the second wall of the bottom wall of the box body away from the electrode assembly is greater than the wall thickness of the first wall of the bottom wall of the box body close to the electrode assembly. Therefore, the second wall has good ability to withstand external force, can better protect the internal structure of the box body, and improve the reliability of the battery device. By setting the wall thickness of the first wall of the bottom wall of the box body close to the electrode assembly to be less than the wall thickness of the second wall of the bottom wall of the box body close to the electrode assembly, the space occupied by the first wall is reduced, the weight of the battery device is reduced, and the energy density of the battery device is improved.

[0024] In some embodiments of the first aspect of the application, the box body further comprises a side wall, one end of the side wall is connected to the bottom wall of the box body along the thickness direction of the bottom wall of the box body, and the other end of the side wall surrounds the first opening. Along the thickness direction of the bottom wall of the box body, the bottom wall of the box body comprises a first wall and a second wall arranged in layers, the first wall and the second wall jointly define the flow channel, the first wall is closer to the electrode assembly than the second wall, and the first wall and the side wall are integrally formed.

[0025] In the technical solution, the first wall of the bottom wall of the box body close to the electrode assembly and the side wall are integrally formed, which is conducive to improving the strength of the box body, thereby improving the ability of the box body to resist external force, and improving the reliability of the battery device.

[0026] In some embodiments of the first aspect of the present application, the box further comprises a box side wall, one end of the box side wall being connected to the box bottom wall along the thickness direction of the box bottom wall, and the other end of the box side wall surrounding the first opening; the box side wall and the box bottom wall are integrally formed.

[0027] In the above technical solution, the box side wall and the box bottom wall are integrally formed, which facilitates the manufacturing of the box, the box has better structural strength, thereby improving the ability of the box to resist external force, and thereby improving the reliability of the battery device.

[0028] In some embodiments of the first aspect of the present application, the cover body is arranged one-to-one corresponding to the subspaces.

[0029] In the above technical solution, the cover body is arranged one-to-one corresponding to the subspaces, that is, one cover body covers the second opening of one subspace, which facilitates the cover body to better cover the second opening, improves the sealing performance of the subspace, reduces the risk of short circuit of the electrode assembly in different subspaces, improves the reliability of the battery device, and facilitates maintenance and replacement of the cover plate. After part of the cover plate is damaged, only the damaged cover plate needs to be repaired or replaced, thereby reducing the difficulty and cost of maintenance.

[0030] In some embodiments of the first aspect of the present application, the battery device further comprises a reinforcing member, the reinforcing member being connected to the surfaces of the plurality of cover bodies away from the electrode assembly.

[0031] In the above technical solution, the reinforcing member is connected to the surfaces of the plurality of cover bodies away from the electrode assembly, which can improve the stability between the cover bodies.

[0032] In some embodiments of the first aspect of the present application, the battery device further comprises a box cover, the box cover being connected to the box and covering the first opening, and the surface of the reinforcing member away from the cover body being connected to the box cover.

[0033] In the above technical solution, the box cover is arranged to cover the first opening, and the box and the box cover form a closed space, which can better protect the internal structure of the battery device and improve the reliability of the battery device. The surface of the reinforcing member away from the cover body is connected to the box cover, which can reduce the risk of movement of the electrode assembly, the cover body, and the heat plate in the box, and improve the reliability of the battery device.

[0034] In some embodiments of the first aspect of the present application, along the extension direction of the reinforcing member, both ends of the reinforcing member are connected to the box.

[0035] In the above technical solution, both ends of the reinforcing member in the extension direction are connected to the box, which can reduce the risk of movement of the electrode assembly and the heat plate in the box, and improve the reliability of the battery device.

[0036] In some embodiments of the first aspect of the application, the battery device further comprises a cover connected to the box and covering the first opening.

[0037] In the above technical solution, the cover covers the first opening, and the box and the cover form a closed space, which can better protect the internal structure of the battery device and improve the reliability of the battery device.

[0038] In the second aspect, the embodiments of the application provide a power consumption device comprising the battery device provided by any one of the embodiments of the first aspect.

[0039] In the above technical solution, the battery device provided by any one of the embodiments of the first aspect has good reliability and long service life, and can improve the power consumption reliability of the power consumption device powered by the battery device. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0041] Figure 1 The structural diagram of the vehicle provided by some embodiments of the application is shown in the following figure:

[0042] Figure 2 The exploded view of the battery device provided by some embodiments of the application is shown in the following figure:

[0043] Figure 3 The exploded view of the battery device provided by some embodiments of the application is shown in the following figure:

[0044] Figure 4 The structural diagram of the box provided by some embodiments of the application is shown in the following figure:

[0045] Figure 5 The structural diagram of the box provided by some embodiments of the application is shown in the following figure:

[0046] Figure 6 The schematic diagram of the cover and the electrode assembly provided by some embodiments of the application is shown in the following figure:

[0047] Figure 7 The structural diagram of the battery device provided by some embodiments of the application is shown in the following figure:

[0048] Figure 8 The sectional view of the heat plate provided by some embodiments of the application is shown in the following figure:

[0049] Figure 9A structure schematic view of the first and second vapor chamber provided for some embodiments of the present application is shown in FIG. 1.

[0050] Figure 10 A cross-sectional view of the box provided for some embodiments of the present application is shown in FIG. 2.

[0051] Figure 11 A cross-sectional view of the box provided for some embodiments of the present application is shown in FIG. 3.

[0052] Figure 12 A cross-sectional view of the box provided for some embodiments of the present application is shown in FIG. 4.

[0053] Figure 13 A cross-sectional view of the box provided for some embodiments of the present application is shown in FIG. 5.

[0054] Figure 14 A structure schematic view of the battery device provided for some embodiments of the present application is shown in FIG. 6.

[0055] Icon: 1000-vehicle; 100-battery device; 10-housing device; 11-box; 111-accommodation space; 1111-first opening; 112-subspace; 1121-second opening; 113-box bottom wall; 1131-flow passage; 1132-fluid medium; 1133-first wall; 1134-second wall; 114-box side wall; 12-box cover; 20-electrode assembly; 21-positive electrode tab; 22-negative electrode tab; 30-cover body; 40-vapor chamber; 40a-first vapor chamber; 401a-first clamping groove; 40b-second vapor chamber; 401b-second clamping groove; 41-chamber body; 411-vapor cavity; 42-vapor medium; 50-electrode terminal; 60-pressure relief component; 70-stiffener; 200-controller; 300-motor; X-thickness direction of the box bottom wall; Y-first direction; Z-second direction. DETAILED DESCRIPTION

[0056] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, all terms used in disclosing the application, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The articles 'a', 'an', and 'the' each followed by'some or more' or 'one or more' of an element are intended to remove any requirement that the element is singular or plural. The terms "comprising", "having", "including", and "containing" are to be construed as open-ended terms (i.e., meaning "including, but not limited to") unless otherwise noted.

[0058] Reference throughout this application to "example" means that a particular feature, structure, or characteristic described in connection with the example can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of other embodiments.

[0059] In the description of the application, it is necessary to explain that, unless otherwise explicitly defined and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0060] In the application, the term "and / or" is only a description of the relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone. In addition, the character " / " in the application generally represents an "or" relationship between the front and rear associated objects.

[0061] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are only exemplary and should not constitute any limitation on the application.

[0062] "Multiple" appearing in the application refers to two or more (including two).

[0063] The battery device includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During charging and discharging of the battery device, 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 reduce the risk of short circuit of the positive and negative electrodes, while allowing the active ions to pass through.

[0064] In some embodiments, the cathode can be a cathode tab, and the cathode tab can include a cathode current collector and a cathode active material disposed on at least one surface of the cathode current collector.

[0065] As an example, the cathode current collector has two surfaces opposite in the thickness direction thereof, and the cathode active material is disposed on either one or both of the two surfaces of the cathode current collector.

[0066] As an example, the cathode current collector can employ a metal foil or a composite current collector. For example, as the metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0067] As an example, the cathode active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a cathode active material of a battery device can also be used. These cathode active materials can be used alone only one or two or more thereof can be used in combination. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (which can also be referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3Mn 1 / 3 O2 (which can also be referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be referred to as NCM 211 ), LiNi 0.6 Co 0.2Mn 0.2 O2(also can be referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2(also can be referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2), and modified compounds thereof.

[0068] In some embodiments, the positive electrode can employ a foam metal. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or the like. When the foam metal is employed as the positive electrode, the foam metal surface can be free of the positive electrode active material, or can be provided with the positive electrode active material. As an example, the foam metal can be filled or / and deposited with a lithium source material, a potassium metal, or a sodium metal, the lithium source material being a lithium metal and / or a lithium-rich material.

[0069] In some embodiments, the negative electrode can be a negative electrode tab, which can include a negative electrode current collector.

[0070] As an example, the negative electrode current collector can employ a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, an aluminum with a silver plating treatment on the surface, a stainless steel with a silver plating treatment on the surface, a stainless steel, a copper, an aluminum, a nickel, a carbon electrode, carbon, nickel, or titanium, or the like can be employed. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or the like. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, or the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0071] As an example, the negative electrode tab can include the negative electrode current collector and the negative electrode active material provided on at least one surface of the negative electrode current collector.

[0072] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is provided on either one or both of the two opposite surfaces of the negative electrode current collector.

[0073] As an example, the negative active material can employ a negative active material for a battery device known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compound, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy. The tin-based material can be selected from at least one of elemental tin, tin oxide compound, and tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative active material can also be used. These negative active materials can be used alone or in combination of two or more.

[0074] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0075] In some embodiments, the separator is a separator film. The separator film can be any porous structure separator film known in the art that has good chemical stability and mechanical stability.

[0076] As an example, the material of the separator film can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film. When the separator film is a multi-layer composite film, the materials of the layers can be the same or different. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0077] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive and negative electrodes, and functions to transport ions and separate the positive and negative electrodes.

[0078] In some embodiments, the battery device further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The electrolyte can be in a liquid state, a gel state, or a solid state. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0079] In some embodiments, the electrolyte salt can include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoroboric oxalate, lithium boric oxalate, lithium difluorophosphoric boric oxalate, and lithium tetrafluorophosphoric boric oxalate.

[0080] In some embodiments, the solvent can include at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, butyl sulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be selected from ether solvents. The ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ether.

[0081] In some embodiments, the gel electrolyte includes a polymer as a skeleton network of the electrolyte, and an ionic liquid-lithium salt.

[0082] In some embodiments, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0083] As an example, the polymer solid electrolyte can be a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, cellulose, or the like.

[0084] As an example, the inorganic solid electrolyte can include one or more of an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfide, argyrodite), amorphous sulfide), and a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

[0085] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0086] In some embodiments, the electrode assembly is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into the jelly-roll structure.

[0087] In some embodiments, the electrode assembly is in a stack structure.

[0088] As an example, the positive electrode sheet and the negative electrode sheet can each be provided in a plurality, and the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately stacked.

[0089] As an example, the positive electrode sheet can be provided in a plurality, 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.

[0090] As an example, the positive electrode sheet and the negative electrode sheet are each folded to form a plurality of folded segments that are stacked.

[0091] As an example, the separators can be provided in plurality, each being provided between any adjacent positive electrode tab or negative electrode tab.

[0092] As an example, the separators can be provided in plurality, each being provided between any adjacent positive electrode tab or negative electrode tab.

[0093] In some embodiments, the electrode assembly can have a shape of a cylinder, a flat, or a polygonal prism, etc.

[0094] In some embodiments, the electrode assembly is provided with a tab, which can guide current out of the electrode assembly. The tab can include a positive electrode tab and a negative electrode tab.

[0095] In the related art, a battery device includes a housing device and a plurality of battery cells, the plurality of battery cells being accommodated in the housing device, and the plurality of battery cells being connected in series, in parallel, or in a hybrid manner in the housing device. The battery cell can include a housing and an electrode assembly, and the electrode assembly is accommodated in the housing. In order to manage the temperature of the battery cell, the battery device further includes a heat management component, which in some cases is a water cooling plate. In this case, the heat management component can be provided between any adjacent two battery cells and / or at the bottom of the battery cell, and the battery cell exchanges heat with the medium in the heat management component to manage the temperature of the battery cell. In order to achieve heat exchange, the heat transfer path at least includes the wall portion of the housing and the wall portion of the heat management component, so that the heat transfer path is long and the heat exchange efficiency is low, which reduces the reliability of the battery device. In addition, the battery device is provided with the heat management component, which occupies the space in the housing device, which reduces the weight and energy density of the battery device.

[0096] Based on the above considerations, in order to improve the reliability of the battery device and improve the energy density of the battery device, the embodiments of the present application provide a battery device, which includes a box body, an electrode assembly, a cover body, and at least one vapor chamber; the box body has an accommodation space, one end of the accommodation space forms a first opening; the at least one vapor chamber is arranged in the accommodation space and divides the accommodation space into a plurality of subspaces, one end of each of the subspaces toward the first opening forms a second opening, and each of the subspaces accommodates at least one electrode assembly; the cover body is connected with the vapor chamber and seals the second opening, and the cover body is provided with an electrode terminal, which is electrically connected with the electrode assembly.

[0097] The accommodating space of the box is divided into multiple subspaces by the heat plate, and the electrode assembly is accommodated in the subspace. During the charging and discharging process of the battery device, heat exchange is performed between the interior of the subspace and the heat medium in the heat plate, the temperature difference between the regions of the subspace is reduced, the uniformity of the temperature in the subspace is improved, the risk of local overheating of the battery device leading to thermal runaway, and even explosion or fire of the battery device is reduced, and the reliability of the battery device is improved. The temperature distribution in the subspace is more uniform, which is also beneficial to the more uniform stress distribution of the electrode group, delays the aging of the battery device, and prolongs the service life of the battery device.

[0098] The accommodating space of the box is divided into multiple subspaces by the heat plate, and the electrode assembly is accommodated in the subspace. During the charging and discharging process of the battery device, heat exchange is performed between the interior of the subspace and the heat medium in the heat plate, the temperature difference between the regions of the subspace is reduced, the uniformity of the temperature in the subspace is improved, the risk of local overheating of the battery device leading to thermal runaway, and even explosion or fire of the battery device is reduced, and the reliability of the battery device is improved. The temperature distribution in the subspace is more uniform, which is also beneficial to the more uniform stress distribution of the electrode group, delays the aging of the battery device, and prolongs the service life of the battery device.

[0099] The accommodating space of the box is divided into multiple subspaces by the heat plate, and the electrode assembly is accommodated in the subspace. During the charging and discharging process of the battery device, heat exchange is performed between the interior of the subspace and the heat medium in the heat plate, the temperature difference between the regions of the subspace is reduced, the uniformity of the temperature in the subspace is improved, the risk of local overheating of the battery device leading to thermal runaway, and even explosion or fire of the battery device is reduced, and the reliability of the battery device is improved. The temperature distribution in the subspace is more uniform, which is also beneficial to the more uniform stress distribution of the electrode group, delays the aging of the battery device, and prolongs the service life of the battery device.

[0100] The technical solutions described in the embodiments of the present application are applicable to various electric devices, for example, mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0101] The following embodiments are described for convenience with the electric device being a vehicle 1000.

[0102] Please refer to Figure 1 , Figure 1 The structure schematic diagram of the vehicle 1000 provided by some embodiments of the present application is shown. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, the head or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as the operating power supply of the vehicle 1000.

[0103] The vehicle 1000 can also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0104] In some embodiments of the present application, the battery device 100 can not only serve as the power source for operating the vehicle 1000, but also serve as the driving power source for the vehicle 1000, replacing or partially replacing the fuel or natural gas to provide driving power for the vehicle 1000.

[0105] Please refer to Figure 2 , Figure 2 The battery device 100 provided in some embodiments of the present application can include a housing device 10 and an electrode assembly 20, and the housing device 10 is used to accommodate the electrode assembly 20.

[0106] The housing device 10 has a closed space formed inside for accommodating the electrode assembly 20. The housing device 10 can adopt various structures. In some embodiments, the housing device 10 can include a box body 11 and a box cover 12, and the box body 11 and the box cover 12 are mutually buckled. The box body 11 and the box cover 12 can have various shapes, such as a cuboid, a cylinder, etc. The box body 11 can be a hollow structure with one side open, and the box cover 12 can also be a hollow structure with one side open. The open side of the box body 11 and the open side of the box cover 12 are buckled to each other, thereby forming the housing device 10 with a closed space. Alternatively, the box body 11 can be a hollow structure with one side open, and the box cover 12 can be a plate structure. The box cover 12 is buckled to the open side of the box body 11, thereby forming the housing device 10 with a receiving cavity.

[0107] As shown in Figures 2-5 , the battery device 100 includes a box body 11, an electrode assembly 20, a cover 30, and at least one heating plate 40. The box body 11 has a receiving space 111, and one end of the receiving space 111 forms a first opening 1111. The at least one heating plate 40 is arranged in the receiving space 111 and divides the receiving space 111 into a plurality of sub-spaces 112. The sub-spaces 112 have second openings 1121 formed at one end thereof facing the first opening 1111. Each sub-space 112 accommodates at least one electrode assembly 20. The cover 30 is connected to the heating plate 40 and closes the second openings 1121. The cover 30 is provided with electrode terminals 50, and the electrode terminals 50 are electrically connected to the electrode assembly 20.

[0108] The box body 11 includes a box bottom wall 113 and a box side wall 114. Along the thickness direction X of the box bottom wall, one end of the box side wall 114 is surrounded by the outer periphery of the box bottom wall 113, and the box bottom wall 113 and the box side wall 114 jointly form the receiving space 111. The other end of the box side wall 114 forms the first opening 1111. The box bottom wall 113 supports the electrode assembly 20 and the heating plate 40.

[0109] Subspace 112 is a smaller space within the enclosure 11 than the containing space 111, and is a part of the containing space 111. Subspace 112 may be defined by the bottom wall 113 and the heat spreader 40. Alternatively, subspace 112 may be defined by the heat spreader 40, the bottom wall 113, and the side wall 114.

[0110] Each subspace 112 can accommodate one electrode assembly 20 or multiple electrode assemblies 20. In an embodiment where the subspace 112 accommodates multiple electrode assemblies 20, the positive electrode tab 21 and the negative electrode tab 22 of the electrode assembly 20 can be located at one end of the electrode assembly 20 near the second opening 1121.

[0111] The cover 30 is connected to the end of the heat spreader 40 away from the bottom wall 113 of the box, and the cover 30 closes the second opening 1121. In the embodiment where the subspace 112 is defined by the bottom wall 113, the side wall 114 and the heat spreader 40, the cover 30 is also connected to the side wall 114 of the box, thereby closing the second opening 1121.

[0112] Here, "closed" refers to covering or shutting down; it can be either sealed or unsealed.

[0113] The cover 30, housing 11, and heat spreader 40 together define a receiving space for accommodating the electrode assembly 20 and other components. The cover 30 can be connected to the heat spreader 40 by welding, bonding, or other methods to close the second opening 1121. The shape of the cover 30 can be adapted to the shape of the second opening 1121. For example, if the second opening 1121 is rectangular, the cover 30 can be a rectangular plate structure adapted to the second opening 1121; or if the second opening 1121 is circular, the cover 30 can be a circular plate structure adapted to the second opening 1121. The cover 30 can also be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy. The cover 30 and the body of the heat spreader 40 can be made of the same or different materials.

[0114] like Figure 6 As shown, electrode terminals 50 are disposed on the cover 30. Electrode terminals 50 are used for electrical connection with the tabs of electrode assembly 20 to input or output electrical energy. Electrode terminals 50 and cover 30 can be insulated from each other. Each subspace 112 can be provided with two electrode terminals 50 on the end cover. The two electrode terminals 50 are electrically connected to the positive tab 21 and negative tab 22 of the electrode assembly 20 in the corresponding subspace 112.

[0115] The electrode terminals 50 corresponding to different subspaces 112 can be connected in series, parallel, or in a mixed manner. Specifically, the electrode terminals 50 corresponding to different subspaces 112 can be connected in series, parallel, or in a mixed manner through a busbar (not shown in the figure). The busbar can be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0116] like Figure 6 , Figure 7 As shown, in some embodiments, a pressure relief component 60 may also be provided on the cover 30, which can release the pressure within the subspace 112. The pressure relief component 60 may be an explosion-proof valve.

[0117] Electrode terminal 50 can be directly connected to the electrode tab, for example, by soldering electrode terminal 50 to the electrode tab. Electrode terminal 50 can also be indirectly connected to the electrode tab, for example, by connecting electrode terminal 50 to the electrode tab indirectly through a current collector. The current collector can be a metallic conductor, such as copper, iron, aluminum, steel, or aluminum alloy.

[0118] There can be one cover 30, that is, one cover 30 covers all the second openings 1121 of the subspaces 112. There can also be multiple covers 30, one cover 30 covers one or more second openings 1121.

[0119] The heat spreader 40 can be connected to the housing 11. The heat spreader 40 can be connected to the bottom wall 113 of the housing, or to the side wall 114 of the housing, or it can be connected to both the bottom wall 113 and the side wall 114 of the housing.

[0120] The heat spreader 40 and the housing 11 can be fixedly connected, such as by adhesive bonding or welding. Alternatively, the heat spreader 40 and the housing 11 can be detachably connected, such as by bolts or by welding clips.

[0121] The heat spreader 40 has an internal heat spreader cavity 411 containing a heat spreader medium 42. The heat spreader cavity 411 can be a vacuum cavity. The heat spreader medium 42 can undergo a phase change according to temperature changes. The heat spreader medium 42 can switch between gas and liquid phases.

[0122] When heat is conducted to the evaporation area from the heat source, the liquid heat medium 42 in the heat equalizing cavity 411 starts to produce the gasification phenomenon of the heat medium 42 after being heated in the low vacuum environment. At this time, the heat medium 42 absorbs heat energy and expands rapidly in volume. The gaseous heat medium 42 rapidly fills the entire heat equalizing cavity 411. When the gaseous heat medium 42 contacts a relatively cold area, condensation occurs, releasing the heat accumulated during evaporation. The condensed heat medium 42 can be used for the next evaporation. This process will be repeated in the heat equalizing cavity 411.

[0123] In this embodiment, if the temperature in the sub-space 112 is higher than the temperature of the heat medium 42, the heat in the sub-space 112 can be transmitted to the heat medium 42 through the wall of the heat plate 40. The heat medium 42 absorbs the heat in the sub-space 112, reducing the temperature in the sub-space 112. The liquid heat medium 42 gasifies. The gasified heat medium 42 flows to other locations in the heat equalizing cavity 411. If the temperature of the gasified heat medium is higher than the temperature in the sub-space 112, the heat of the gasified heat medium is transmitted to the sub-space 112 through the wall of the heat plate 40 to increase the temperature in the sub-space 112. Thus, the temperature in the sub-space 112 is adjusted. The temperature difference between different regions of the sub-space 112 and different sub-spaces 112 is small. The temperature inside the battery device 100 is more uniform.

[0124] The accommodating space 111 of the box body 11 is divided into a plurality of subspaces 112 by the heat conduction plate 40, and the electrode assembly 20 is accommodated in the subspace 112. During the charging and discharging process of the battery device 100, heat exchange is performed between the subspace 112 and the heat conduction medium 42 in the heat conduction plate 40, which can reduce the temperature difference between different regions of the subspace 112, improve the uniformity of the temperature in the subspace 112, reduce the risk of local overheating of the battery device 100 causing thermal runaway, and even cause the battery device 100 to explode or catch fire, and improve the reliability of the battery device 100. The temperature distribution in the subspace 112 is more uniform, which is also beneficial to the more uniform stress distribution of the electrode group, delays the aging of the battery device 100, and prolongs the service life of the battery device 100. The accommodating space 111 of the box body 11 is divided into a plurality of subspaces 112 by the heat conduction plate 40, and heat exchange occurs between the subspace 112 and the heat conduction medium 42 in the heat conduction plate 40, which only needs to pass through one side wall of the heat conduction plate 40, so that the heat transfer path is shorter and the heat exchange efficiency is higher, thereby improving the temperature regulation efficiency in the subspace 112. The accommodating space 111 of the box body 11 is divided into a plurality of subspaces 112 by the heat conduction plate 40, and the electrode assembly 20 is arranged in the subspace 112. The heat conduction plate 40 not only forms the shell of the electrode assembly 20, but also plays a role in regulating the temperature inside the battery device 100. Therefore, the battery device 100 can not need to separately set a shell for the electrode assembly 20, which simplifies the structure of the battery device 100 and reduces the weight of the battery device 100, and is beneficial to reducing the cost of the battery device 100 and improving the energy density of the battery device 100.

[0125] As shown in Figure 5 some embodiments, the battery device 100 includes a plurality of heat conduction plates 40, and the plurality of heat conduction plates 40 divide the accommodating space 111 into a plurality of subspaces 112.

[0126] The number of heat conduction plates 40 can be two, three, four, etc. The arrangement of the plurality of heat conduction plates 40 in the accommodating space 111 can be various, such as side-by-side arrangement of the plurality of heat conduction plates 40 along a straight line, cross arrangement of the plurality of heat conduction plates 40, etc.

[0127] The accommodating space 111 is divided into a plurality of subspaces 112 by the plurality of heat conduction plates 40, so that the area for regulating the temperature of the subspace 112 in the battery device 100 is larger, which is beneficial to improving the temperature regulation efficiency and further improving the uniformity of the temperature in the subspace 112.

[0128] As shown in Figure 5 some embodiments, the plurality of heat conduction plates 40 includes a plurality of first heat conduction plates 40a, and the plurality of first heat conduction plates 40a are arranged in the first direction Y.

[0129] Multiple first heat spreaders 40a divide the accommodating space 111 into at least three subspaces 112 in a first direction Y. The heat spreaders within the multiple first heat spreaders 40a may be interconnected or disconnected. The first direction Y may be the thickness direction X perpendicular to the bottom wall of the chamber.

[0130] The plurality of heat spreaders 40 include a plurality of first heat spreaders 40a arranged at intervals along the first direction Y. The plurality of first heat spreaders 40a jointly regulate the temperature inside the battery device 100, which is beneficial to improving the efficiency of temperature regulation and further improving the temperature uniformity inside the subspace 112.

[0131] In some embodiments, the plurality of heat spreaders 40 include a plurality of second heat spreaders 40b, the plurality of second heat spreaders 40b are arranged at intervals along the second direction Z, the second heat spreaders 40b are intersected with the first heat spreader 40a, the first heat spreader 40a and the second heat spreader 40b together divide the accommodating space 111 into a plurality of subspaces 112, the first direction Y intersects with the second direction Z.

[0132] Multiple second heat spreaders 40b divide the accommodating space 111 into at least three subspaces 112 in the second direction Z. The first direction Y and the second direction Z can be perpendicular.

[0133] The heat dissipation spaces within the multiple second heat dissipation plates 40b can be interconnected, or they can be disconnected from each other. The heat dissipation cavity 411 of the first heat dissipation plate 40a and the heat dissipation cavity 411 of the second heat dissipation plate 40b can be interconnected or independent of each other.

[0134] By using multiple first heat-spreading plates 40a spaced apart along the first direction Y and multiple second heat-spreading plates 40b spaced apart along the second direction Z, the accommodating space 111 is divided into multiple sub-spaces 112. The cross-arranged first heat-spreading plates 40a and second heat-spreading plates 40b can jointly regulate the temperature inside the battery device 100, which is beneficial to improving the efficiency of temperature regulation and further improving the temperature uniformity inside the sub-spaces 112.

[0135] like Figure 8 As shown, in some embodiments, the heat spreader 40 includes a plate body 41 and a heat spreader medium 42. A heat spreader cavity 411 is formed inside the plate body 41, and the heat spreader medium 42 is contained in the heat spreader cavity 411. The heat spreaders 411 of any two heat spreaders 40 are not connected.

[0136] The material of the plate body 41 can be aluminum, copper, etc. The insulating medium and the heat transfer inside the subspace 112 pass through the plate body 41.

[0137] If the heat-spreading cavities 411 of any two heat-spreading plates 40 are not connected, then the heat-spreading cavities 411 of any two heat-spreading plates 40 are independent of each other.

[0138] If the heat dissipation chambers 411 of any two heat dissipation plates 40 are not connected, then each heat dissipation plate 40 is an independent entity, which facilitates the flexible arrangement of the heat dissipation plates 40 and the maintenance and replacement of the heat dissipation plates 40. If some heat dissipation plates 40 are damaged, only the damaged heat dissipation plates 40 need to be repaired or replaced, reducing the difficulty and cost of maintenance.

[0139] like Figure 9 As shown, in some embodiments, the first heat spreader 40a is provided with a first slot 401a, and the second heat spreader 40b is provided with a second slot 401b. The first heat spreader 40a is inserted into the second slot 401b, and the second heat spreader 40b is inserted into the first slot 401a, so as to realize that the first heat spreader 40a and the second heat spreader 40b are arranged crosswise.

[0140] The first slot 401a is disposed on the surface of the plate body 41 of the first heat spreader 40a. The first slot 401a can be recessed from the surface of the plate body 41 of the first heat spreader 40a along the thickness direction X of the bottom wall of the box. The first slot 401a can be recessed from the surface of the plate body 41 of the first heat spreader 40a facing the bottom wall 113 of the box in a direction away from the bottom wall 113 of the box, with the opening of the first slot 401a facing the bottom wall 113 of the box. The first slot 401a can be recessed from the surface of the plate body 41 of the first heat spreader 40a away from the bottom wall 113 of the box in a direction close to the bottom wall 113 of the box, with the opening of the first slot 401a facing the second opening 1121.

[0141] The second slot 401b is disposed on the surface of the plate body 41 of the second heat spreader 40b. The second slot 401b can be recessed from the surface of the plate body 41 of the first heat spreader 40a along the thickness direction X of the bottom wall of the box. The orientation of the opening of the first slot 401a is opposite to the orientation of the opening of the second slot 401b.

[0142] In an embodiment where the first slot 401a is recessed from the surface of the first heat spreader 40a facing the bottom wall 113 in a direction away from the bottom wall 113, the second slot 401b can be recessed from the surface of the second heat spreader 40b facing away from the bottom wall 113 in a direction close to the bottom wall 113, with the opening of the second slot 401b facing the second opening 1121. In an embodiment where the first slot 401a is recessed from the surface of the first heat spreader 40a facing away from the bottom wall 113 in a direction close to the bottom wall 113, the second slot 401b can be recessed from the surface of the second heat spreader 40b facing the bottom wall 113 in a direction away from the bottom wall 113, with the opening of the second slot 401b facing the bottom wall 113.

[0143] The slot depth of the first clamping groove 401a and the slot depth of the second clamping groove 401b can be the same, so that after the first vapor chamber 40a is clamped into the second clamping groove 401b and the second vapor chamber 40b is clamped into the first clamping groove 401a, the surface of the first vapor chamber 40a facing the bottom wall 113 of the box and the surface of the second vapor chamber 40b facing the bottom wall 113 of the box can be flush, facilitating installation.

[0144] By clamping the first vapor chamber 40a into the second clamping groove 401b of the second vapor chamber 40b and clamping the second vapor chamber 40b into the first clamping groove 401a of the first vapor chamber 40a, the first vapor chamber 40a and the second vapor chamber 40b are conveniently arranged in a cross manner, and after being arranged in a cross manner, the first vapor chamber 40a and the second vapor chamber 40b can be mutually restricted, thereby improving the connection stability of the first vapor chamber 40a and the second vapor chamber 40b.

[0145] In some embodiments, the thermal conductivity of the vapor chamber 40 is greater than or equal to 2000 W / (m.K).

[0146] The thermal conductivity is an important physical quantity for measuring the heat conduction capacity of the vapor chamber 40, and its size depends on the properties of the plate body 41 of the vapor chamber 40 and the vapor medium 42, such as density, humidity, temperature, and pressure.

[0147] Exemplarily, the thermal conductivity of the vapor chamber 40 can be 2000 W / (m.K), 2100 W / (m.K), 2200 W / (m.K), 2300 W / (m.K), 2400 W / (m.K), 2500 W / (m.K), 2600 W / (m.K), 2700 W / (m.K), 2800 W / (m.K), 2900 W / (m.K), 3000 W / (m.K), etc.

[0148] By making the thermal conductivity of the vapor chamber 40 greater than or equal to 2000 W / (m.K), the vapor chamber 40 has good heat conduction capacity, thereby facilitating improvement of the efficiency of the vapor chamber 40 in regulating the temperature inside the sub-space 112.

[0149] In some embodiments, the thickness of the vapor chamber 40 at any position is greater than or equal to 1 mm and less than or equal to 5 mm.

[0150] The thickness of the vapor chamber 40 can be the distance between two adjacent sub-spaces 112. As shown in FIG. 1, the thickness of the vapor chamber 40 is W, and 1 mm≤W≤5 mm. Figure 8

[0151] The vapor chamber 40 can be an equal-thickness structure or a non-equal-thickness structure.

[0152] The thickness of the first vapor chamber 40a and the thickness of the second vapor chamber 40b can be the same or different.​

[0153] Exemplarily, the thickness of the vapor chamber 40 can be 1 mm, 1.2 mm, 1.5 mm, 1.6 mm, 2 mm, 2.2 mm, 2.5 mm, 2.8 mm, 3 mm, 3.2 mm, 3.5 mm, 3.8 mm, 4 mm, 4.2 mm, 4.5 mm, 4.8 mm, 5 mm, etc.

[0154] By setting the thickness of the vapor chamber 40 at any position to be greater than or equal to 1 mm, the vapor chamber 40 has a higher strength, and the ability of the vapor chamber 40 to resist impact is improved. By setting the thickness of the vapor chamber 40 at any position to be less than or equal to 5 mm, the temperature of the vapor chamber 40 is controlled within a reasonable range, and the space occupied by the vapor chamber 40 is reduced, so that the internal space of the box body 11 can be used more for accommodating the electrode assembly 20, which is conducive to improving the energy density of the battery device 100.

[0155] As shown in FIG. 1, in some embodiments, the box body 11 includes a box bottom wall 113 supporting the electrode assembly 20 and the vapor chamber 40. Figure 10 As shown in FIG. 1, in some embodiments, the box body 11 includes a box bottom wall 113 supporting the electrode assembly 20 and the vapor chamber 40.

[0156] The box bottom wall 113 bears the gravity of the electrode assembly 20 and the vapor chamber 40.

[0157] The box bottom wall 113 is internally formed with a flow channel 1131 for accommodating a fluid medium 1132 to manage the temperature in the sub-space 112. The flow channel 1131 can be used to reduce the temperature in the sub-space 112, or to increase the temperature in the sub-space 112. The heat in the sub-space 112 can be transferred to the fluid medium 1132, and the fluid medium 1132 flows to take away the heat in the sub-space 112, thereby reducing the temperature in the sub-space 112. The heat of the fluid medium 1132 is transferred to the sub-space 112, which can increase the temperature in the sub-space 112.

[0158] The fluid medium 1132 can be a liquid (such as water) or a gas (such as air).

[0159] The box body 11 is further provided with an inlet (not shown in the figure) and an outlet (not shown in the figure). The inlet is configured to allow the fluid medium 1132 to enter the flow channel 1131, and the outlet is configured to allow the fluid medium 1132 to exit the flow channel 1131, so that the fluid medium 1132 can flow in the flow channel 1131 to take away heat or provide heat to the sub-space 112. The outlet and the inlet can be provided on the box side wall 114 or the box bottom wall 113.

[0160] By forming a flow channel 1131 inside the bottom wall 113 of the housing 11, and the flow channel 1131 containing a fluid medium 1132, heat exchange can occur between the fluid medium 1132 in the flow channel 1131 and the internal space of the housing 11, thereby raising or lowering the temperature inside the housing 11. This ensures the normal operation of the battery device 100 and improves its reliability. The bottom wall 113 not only supports and protects the electrode assembly 20 but also manages the temperature inside the housing 11. Therefore, the battery device 100 does not need a separate temperature management structure at the bottom of the electrode assembly 20, simplifying its structure and reducing its weight. This helps to reduce the cost of the battery device 100 and increase its energy density. The bottom wall 113 and the heat spreader 40 work together to manage the temperature inside the housing 11, so that the internal temperature of the battery device 100 is within a reasonable range, improving the reliability of the battery device 100, and making the temperature distribution inside the housing 11 uniform, extending the service life of the battery device 100 and further improving the reliability of the battery device 100.

[0161] like Figure 10 As shown, in some embodiments, along the thickness direction X of the bottom wall of the box, the bottom wall 113 includes a first wall 1133 and a second wall 1134 stacked together. The first wall 1133 and the second wall 1134 together define a flow channel 1131. The first wall 1133 is closer to the electrode assembly 20 than the second wall 1134, and the wall thickness of the second wall 1134 is greater than the wall thickness of the first wall 1133.

[0162] If the first wall 1133 is closer to the electrode assembly 20 than the second wall 1134, then the surface of the first wall 1133 facing away from the second wall 1134 can directly contact the electrode assembly 20 and the heat spreader 40.

[0163] The first wall 1133 and the second wall 1134 can be plate-like structures. The first wall 1133 and the second wall 1134 can be flat plate structures (e.g.) Figure 10 (as shown) or corrugated plate structure (such as) Figure 11 (As shown).

[0164] like Figure 12 As shown, in some other embodiments, the surface of the first wall 1133 facing the second wall 1134 can be curved, which can increase the area of ​​the flow channel 1131, and the surface of the first wall 1133 away from the second wall 1134 can be flat, which facilitates the installation of the electrode assembly 20 and the heat spreader 40.

[0165] The surface of the second wall 1134 facing the first wall 1133 can be curved to increase the area of ​​the flow channel 1131. The surface of the second wall 1134 away from the first wall 1133 can be flat to facilitate the integration of the battery device 100 with the external structure.

[0166] The thickness of the first wall 1133 is the distance between two opposite surfaces of the first wall 1133 in the thickness direction. The thickness of the second wall 1134 is the distance between two opposite surfaces of the second wall 1134 in the thickness direction.

[0167] By setting the thickness of the second wall 1134 of the bottom wall 113, which is farther from the electrode assembly 20, to be greater than the thickness of the first wall 1133, which is closer to the electrode assembly 20, the second wall 1134 has a better ability to withstand external forces, thus better protecting the internal structure of the housing 11 and improving the reliability of the battery device 100. Conversely, by setting the thickness of the first wall 1133, which is closer to the electrode assembly 20, to be less than the thickness of the second wall 1134, the space occupied by the first wall 1133 is reduced, the weight of the battery device 100 is lightened, and the energy density of the battery device 100 is increased.

[0168] like Figure 10 As shown in some embodiments, the housing 11 further includes a side wall 114. Along the thickness direction X of the bottom wall, one end of the side wall 114 is connected to the bottom wall 113, and the other end of the side wall 114 forms a first opening 1111. Along the thickness direction X of the bottom wall, the bottom wall 113 includes a first wall 1133 and a second wall 1134 stacked together. The first wall 1133 and the second wall 1134 together define a flow channel 1131. The first wall 1133 is closer to the electrode assembly 20 than the second wall 1134. The first wall 1133 and the side wall 114 are integrally formed.

[0169] The wall thickness of the first wall 1133 and the wall thickness of the second wall 1134 can be the same or different.

[0170] The first wall 1133 and the box side wall 114 are integrally formed. The first wall 1133 and the box side wall 114 can be formed by an integral forming method, such as stamping or casting.

[0171] The second wall 1134 and the first wall 1133 can be integrally formed, or they can be set separately and then connected to define the flow channel 1131.

[0172] The integral molding of the bottom wall 113 near the first wall 1133 of the electrode assembly 20 and the side wall 114 of the box helps to improve the strength of the box 11, thereby improving the ability of the box 11 to resist external forces and thus improving the reliability of the battery device 100.

[0173] like Figure 13As shown, in some embodiments, the box body 11 further includes a box side wall 114. Along the thickness direction X of the box bottom wall, one end of the box side wall 114 is connected to the box bottom wall 113, and the other end of the box side wall 114 forms a first opening 1111. The box side wall 114 and the box bottom wall 113 are integrally formed.

[0174] If the side wall 114 and the bottom wall 113 of the box are integrally formed, then the bottom wall 113 and the side wall 114 of the box can be formed by an integral forming method, such as stamping or casting.

[0175] The side wall 114 and bottom wall 113 of the box are integrally formed, which facilitates the manufacturing and forming of the box body 11. The box body 11 has better structural strength, thereby improving the ability of the box body 11 to resist external forces, thus improving the reliability of the battery device 100.

[0176] In some embodiments, the cover 30 and the subspace 112 are configured in a one-to-one correspondence.

[0177] Each cover 30 corresponds to the second opening 1121 of the corresponding subspace 112. Each cover 30 is provided with two electrode terminals 50, which are electrically connected to the positive electrode tab 21 and the negative electrode tab 22 of the electrode assembly 20 in the corresponding subspace 112, respectively.

[0178] By setting the cover 30 to correspond one-to-one with the sub-space 112, that is, one cover 30 covers the second opening 1121 of one sub-space 112, it is easier for the cover 30 to better seal the second opening 1121, improve the sealing performance of the sub-space 112, reduce the risk of short circuit of the electrode assembly 20 in different sub-spaces 112, improve the reliability of the battery device 100, and facilitate maintenance and replacement of the cover. After some cover is damaged, only the damaged cover needs to be repaired or replaced, reducing maintenance difficulty and maintenance cost.

[0179] like Figure 14 As shown, in some embodiments, the battery device 100 further includes a reinforcement 70 that connects a plurality of covers 30 away from the surface of the electrode assembly 20.

[0180] The battery device 100 may include multiple rows of covers 30, which are arranged along a first direction Y, and each row of covers 30 includes multiple covers 30 arranged along a second direction Z.

[0181] The battery assembly 100 may include a plurality of reinforcing members 70, which are spaced apart along a first direction Y. Each reinforcing member 70 is connected to each of a row of covers 30.

[0182] In other embodiments, a reinforcement 70 may connect two adjacent rows of covers 30 along the first direction Y.

[0183] The reinforcing member 70 can also be referred to as a batten. The reinforcing member 70 can be a tape, a bundle of wires, or the like.

[0184] The plurality of cover bodies 30 can be stabilized relative to each other by the reinforcing member 70 connecting surfaces of the cover bodies 30 facing away from the electrode assembly 20.

[0185] In some embodiments, the battery device 100 further comprises a lid 12 connected to the case 11 and covering the first opening 1111. The surface of the reinforcing member 70 facing away from the cover body 30 is connected to the lid 12.

[0186] The surface of the reinforcing member 70 facing away from the cover body 30 can be connected to the lid 12 in various ways, such as by being adhesively connected to the lid 12.

[0187] By providing the lid 12 to cover the first opening 1111, the case 11 and the lid 12 form a closed space, which can better protect the internal structure of the battery device 100 and improve the reliability of the battery device 100. By connecting the surface of the reinforcing member 70 facing away from the cover body 30 to the lid 12, the risk of the electrode assembly 20, the cover body 30, and the vapor chamber 40 moving within the case 11 can be reduced, and the reliability of the battery device 100 can be improved.

[0188] In some embodiments, the reinforcing member 70 has two ends connected to the case 11 along the extension direction of the reinforcing member 70.

[0189] In combination with reference to Figure 3 , Figure 7 , the plurality of reinforcing members 70 are arranged at intervals along the first direction Y. The extension direction of the reinforcing member 70 can be parallel to the third direction Z. The two ends of the extension direction of the reinforcing member 70 can be connected to two opposite side walls 114 of the case 11 in the extension direction of the reinforcing member 70. In this embodiment, the two ends of the extension direction of the reinforcing member 70 can be connected to two opposite side walls 114 of the case 11 in the third direction Z.

[0190] Of course, the reinforcing member 70 can also be connected to other structures of the case 11, such as a cross beam of the case 11.

[0191] The two ends of the extension direction of the reinforcing member 70 can be adhesively connected to the case 11.

[0192] By connecting the two ends of the extension direction of the reinforcing member 70 to the case 11, the risk of the electrode assembly 20 and the vapor chamber 40 moving within the case 11 can be reduced, and the reliability of the battery device 100 can be improved.

[0193] In some embodiments, the battery device 100 further comprises a lid 12 connected to the case 11 and covering the first opening 1111.

[0194] The box cover 12 and the reinforcing member 70 can be provided separately, that is, the box cover 12 and the reinforcing member 70 can not be in a connection relationship.

[0195] By covering the first opening 1111 with the box cover 12, the box 11 and the box cover 12 form a closed space, which can better protect the internal structure of the battery device 100 and improve the reliability of the battery device 100.

[0196] The application also provides a battery device 100.

[0197] The battery device 100 provides power for the operation of the electric device.

[0198] The battery device 100 provided by any of the above embodiments has good reliability and a long service life, which can improve the power consumption reliability of the electric device powered by the battery device 100.

[0199] The application provides a battery device 100, which includes a box 11, a box cover 12, an electrode assembly 20, a plurality of cover bodies 30, and a plurality of vapor chambers 40. The box 11 has a containing space 111, one end of the containing space 111 forms a first opening 1111, and the box cover 12 covers the first opening 1111. The plurality of vapor chambers 40 includes a plurality of first vapor chambers 40a arranged at intervals along a first direction Y and a plurality of second vapor chambers 40b arranged at intervals along a second direction Z, the second vapor chambers 40b are arranged transversely to the first vapor chambers 40a, and the first vapor chambers 40a and the second vapor chambers 40b together divide the containing space 111 into a plurality of subspaces 112, and the first direction Y is perpendicular to the second direction Z.

[0200] One end of each subspace 112 facing the first opening 1111 forms a second opening 1121, and each subspace 112 contains at least one electrode assembly 20; the cover bodies 30 are arranged one-to-one corresponding to the subspaces 112, and the cover bodies 30 close the second openings 1121 of the corresponding subspaces 112. Each cover body 30 is provided with two electrode terminals 50 insulated thereon, and the two electrode terminals 50 are electrically connected to the positive and negative electrode tabs 21 and 22 of the electrode assembly 20 in the corresponding subspace 112, respectively. The bottom wall 113 of the box 11 supports the electrode assembly 20 and the vapor chambers 40, and the bottom wall 113 is formed with a flow channel 1131, and the flow channel 1131 is provided with a fluid medium 1132.

[0201] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict.

[0202] The above examples are only used to illustrate the technical solutions of the present application, and are not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. 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 by, The battery device comprises: a box body having a containing space, one end of the containing space forming a first opening; at least one vapor chamber arranged in the containing space and separating the containing space into a plurality of subspaces, one end of the subspaces forming a second opening; an electrode assembly, each of the subspaces containing at least one electrode assembly; and a cover body connected with the vapor chamber and closing the second opening, the cover body being provided with an electrode terminal electrically connected with the electrode assembly.

2. The battery device of claim 1, wherein The battery device comprises a plurality of vapor chambers, and the plurality of vapor chambers separate the containing space into a plurality of subspaces.

3. The battery device of claim 2, wherein The plurality of vapor chambers comprises a plurality of first vapor chambers, and the plurality of first vapor chambers are arranged in a first direction.

4. The battery device of claim 3, wherein The plurality of vapor chambers comprises a plurality of second vapor chambers, and the plurality of second vapor chambers are arranged in a second direction, the second vapor chambers being arranged crosswise to the first vapor chambers, the first vapor chambers and the second vapor chambers together separating the containing space into a plurality of subspaces, the first direction intersecting the second direction.

5. The battery device of claim 4, wherein The vapor chamber comprises a chamber body and a vapor medium, the chamber body being internally formed with a vapor chamber cavity, and the vapor medium being contained in the vapor chamber cavity, the vapor chamber cavities of any two vapor chambers not being communicated.

6. The battery device of claim 4, wherein The first vapor chamber is provided with a first clamping groove, the second vapor chamber is provided with a second clamping groove, the first vapor chamber is clamped into the second clamping groove, and the second vapor chamber is clamped into the first clamping groove, so as to achieve cross arrangement of the first vapor chamber and the second vapor chamber.

7. The battery device of any one of claims 1-6, wherein, The thermal conductivity of the vapor chamber is greater than or equal to 2000 W / (m.K).

8. The battery device of any one of claims 1-6, wherein, The thickness of any position of the vapor chamber is greater than or equal to 1 mm and less than or equal to 5 mm.

9. The battery device of any one of claims 1-6, wherein, The box body comprises a box bottom wall, and the box bottom wall supports the electrode assembly and the vapor chamber. The box bottom wall is internally formed with a flow channel for containing a fluid medium to manage the temperature in the subspaces.

10. The battery device of claim 9, wherein In the thickness direction of the box bottom wall, the box bottom wall comprises a first wall and a second wall arranged in a stacked manner, the first wall and the second wall together defining the flow channel, the first wall being closer to the electrode assembly than the second wall, and the wall thickness of the second wall being greater than the wall thickness of the first wall.

11. The battery device of claim 9, wherein The box body further comprises a box side wall, one end of the box side wall being connected to the box bottom wall in the thickness direction of the box bottom wall, and the other end of the box side wall surrounding the first opening. In the thickness direction of the box bottom wall, the box bottom wall comprises a first wall and a second wall arranged in a stacked manner, the first wall and the second wall together defining the flow channel, the first wall being closer to the electrode assembly than the second wall, and the first wall and the box side wall being integrally formed.

12. The battery device of claim 9, wherein, The box body further comprises a box side wall, one end of the box side wall being connected to the box bottom wall in the thickness direction of the box bottom wall, and the other end of the box side wall surrounding the first opening. The box side wall and the box bottom wall are integrally formed.

13. The battery device of any one of claims 1-6, wherein, The cover body is arranged in one-to-one correspondence with the subspaces.

14. The battery device of claim 13, wherein, The battery device further comprises a reinforcing member connected to the surfaces of the cover bodies away from the electrode assemblies.

15. The battery device of claim 14, wherein, The battery device further comprises a cover connected to the box and covering the first opening, and the reinforcing member is connected to the cover away from the surface of the cover.

16. The battery device of claim 14, wherein, In the extending direction of the reinforcing member, the two ends of the reinforcing member are respectively connected to the box.

17. An electrical device, comprising: A battery device comprising any of the features of claims 1-16.

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