Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment, the battery device comprises a box body, an electric heating piece and a plurality of battery monomers, the box body comprises a plurality of wall plates, the plurality of wall plates define a containing space, the plurality of wall plates comprise a bottom plate, the plurality of battery monomers are arranged in the containing space and are directly connected with the bottom plate, the electric heating piece is at least arranged in the bottom plate in the plurality of wall plates, and the electric heating piece is arranged in the containing space. The electric heating piece is used for heating at least part of the battery monomers. According to the battery pack, the electric heating piece is arranged in the bottom plate, so that the shielding of the electric heating piece between the bottom plate and the battery monomers is reduced, the contact area between the bottom plate and the battery monomers is increased, the connection strength between the bottom plate and the battery monomers can be improved, and the situation that the battery monomers fall off from the bottom plate is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, and particularly relates to a battery device and an electric equipment. BACKGROUND

[0002] With the development of new energy, more and more fields use new energy as power. Due to the advantages of high energy density, recyclable charging, safety and environmental protection, battery devices are widely used in the fields of new energy vehicles, consumer electronics, energy storage systems and the like.

[0003] In the related art, the battery device includes a box body and a plurality of battery monomers. The plurality of battery monomers are arranged in the box body and connected to the bottom plate of the box body. A heating film is arranged between the bottom plate and the plurality of battery monomers to heat the battery monomers by using the heating film. However, the position of the heating film cannot be directly connected to the box body, which leads to poor connection strength between the battery monomers and the bottom plate, and the battery monomers are prone to falling off the bottom plate. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides a battery device and an electric equipment, which solves the problem of poor connection strength between the battery monomers and the bottom plate of the box body.

[0005] The first aspect of the present application provides a battery device, which comprises:

[0006] a box body, the box body comprising a plurality of wall plates, the plurality of wall plates enclosing a containing space, and the plurality of wall plates comprising a bottom plate;

[0007] a plurality of battery monomers, the plurality of battery monomers being arranged in the containing space and directly connected to the bottom plate;

[0008] an electric heating element, at least the bottom plate of the plurality of wall plates being provided with the electric heating element, and the electric heating element being used for heating at least part of the plurality of battery monomers.

[0009] In the present application, the electric heating element is arranged in the bottom plate, which reduces the shielding between the bottom plate and the battery monomers, thereby increasing the contact area between the bottom plate and the battery monomers, and further improving the connection strength between the bottom plate and the battery monomers, and reducing the situation of the battery monomers falling off the bottom plate.

[0010] In some embodiments of the present application, the electric heating element is an electric heating wire. In this way, the electric heating element is arranged and installed in the wall plate, thereby improving the convenience of assembly.

[0011] In some embodiments of the present application, the side of the wall plate provided with the electric heating element facing the containing space is provided with a groove. The groove is formed by removing materials or non-removing materials, and all the grooves are embedded with the electric heating element. In this way, the convenience of assembling the electric heating element to the wall plate is further improved.

[0012] In some embodiments of the present application, the recess comprises:

[0013] The first segments are arranged in parallel and spaced apart;

[0014] The second segments connect two adjacent first segments.

[0015] In this way, the heating effect of the plurality of battery monomers in the box can be improved, and the uniformity of the battery monomer heating is effectively improved.

[0016] In some embodiments of the present application, the number of first segments is at least three, the number of second segments is more than that of first segments, and two adjacent second segments are connected to opposite ends of the same first segment along the arrangement direction of the first segments. In this way, the electric heating element can be more evenly distributed on the wall plate, thereby further improving the heating effect of the battery monomers.

[0017] In some embodiments of the present application, the first segment is a straight line segment or a curved segment. In this way, the structure of the first segment can be set as needed to enable the electric heating element to better heat the battery monomers.

[0018] In some embodiments of the present application, the second segment is a straight line segment or a curved segment. In this way, the structure of the second segment can be set as needed to enable the electric heating element to better heat the battery monomers.

[0019] In some embodiments of the present application, the recess further comprises a third segment, one of the outermost first segments is connected to the third segment, one tail end of the electric heating element is embedded in the third segment, and the other tail end of the electric heating element is embedded in the other outermost first segment, wherein the third segment is arranged at an angle to the first segment. In this way, the tail end of the electric heating element can be set according to the needs of the battery device to facilitate wiring operation of the electric heating element.

[0020] In some embodiments of the present application, one tail end of the electric heating element is embedded in one of the outermost first segments, and the other tail end of the electric heating element is embedded in the other outermost first segment.

[0021] In this way, the tail end of the electric heating element can be set according to the needs of the battery device to facilitate wiring operation of the electric heating element.

[0022] In some embodiments of the present application, the bottom of each battery cell is provided with at least one groove, so that the electric heating element and the battery cell have sufficient contact area, further increasing the heat exchange effect on the battery.

[0023] In some embodiments of the present application, the wall plate is formed with a groove by milling, planing, stamping or aluminum extrusion. In this way, the groove can be easily machined on the wall plate, thereby improving the convenience of processing and reducing the manufacturing cost.

[0024] In some embodiments of the present application, the electric heating element is arranged in the groove by clamping, bonding, welding or connecting through a connecting piece. In this way, the electric heating element can be fixed in the groove according to the assembly requirements, thereby improving the assembly convenience and speeding up the production rhythm.

[0025] In some embodiments of the present application, the entire body of the electric heating element is accommodated in the groove. In this way, the electric heating element is reduced to protrude relative to the groove, reducing the interference of the electric heating element on the battery cell, and further improving the connection strength between the battery cell and the bottom plate.

[0026] In some embodiments of the present application, the battery device further comprises a heat-conducting structure, the heat-conducting structure seals the slot of the groove, and the electric heating element is in heat-conducting connection with the battery cell through the heat-conducting structure. In this way, the heat exchange efficiency between the electric heating element and the battery cell can be increased, so that the heating effect of the battery cell can be improved.

[0027] In some embodiments of the present application, the heat-conducting structure is heat-conducting glue or heat-conducting pad. In this way, the structure is simple, and the manufacturing cost can be effectively reduced.

[0028] In some embodiments of the present application, the plurality of wall plates further comprise:

[0029] a top plate, the top plate being arranged above the bottom plate in a spaced manner;

[0030] a plurality of side plates, the plurality of side plates being arranged in sequence and connected, the plurality of side plates being connected with the top plate and the bottom plate respectively to enclose the accommodating space, and at least part of the plurality of side plates being provided with an electric heating element.

[0031] In this way, the battery cell can be heated on the side, and the battery cell can be uniformly heated.

[0032] The second aspect of the present application proposes a power consumption equipment, which comprises the above battery device.

[0033] The battery device of the electric device, by setting the electric heating element in the bottom plate, reduces the shielding between the electric heating element and the battery monomer and the bottom plate, increases the contact area between the bottom plate and the battery monomer, and further improves the connection strength between the bottom plate and the battery monomer, reduces the situation that the battery monomer and the bottom plate fall off.

[0034] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clear, the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 The structure schematic diagram of the vehicle according to an embodiment of the present application is schematically shown;

[0036] Figure 2 The structure schematic diagram of the battery device according to an embodiment of the present application is schematically shown;

[0037] Figure 3 The exploded structure schematic diagram of the battery device shown in Figure 2

[0038] Figure 4 The exploded structure schematic diagram of the bottom plate part of the battery device shown in Figure 3

[0039] Figure 5 The structure schematic diagram of the bottom plate in the structure shown in Figure 4

[0040] Figure 6 The structure schematic diagram of the side plate part of the battery device shown in Figure 3

[0041] Figure 7 The exploded structure schematic diagram of the structure shown in Figure 6

[0042] Figure 8 The enlarged structure schematic diagram of A-A in the structure shown in Figure 6

[0043] Figure 9 The enlarged structure schematic diagram of B in the structure shown in Figure 8

[0044] Figure 10 The structure schematic diagram of the side plate in the structure shown in Figure 7 The reference signs are as follows:

[0045]

[0046] ​​​​​​​1000, vehicle;

[0047] 100, battery device; 200, controller; 300, motor;

[0048] 10, box body;

[0049] 11, wall plate;

[0050] 12, bottom plate;

[0051] 13, top plate;

[0052] 14, side plate;

[0053] 15, groove;

[0054] 151, first section; 152, second section; 153, third section;

[0055] 20, battery cell;

[0056] 30, heat conduction structure;

[0057] 40, electric heating element. DETAILED DESCRIPTION

[0058] The embodiments of the technical scheme of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0059] 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 terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0060] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0061] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0062] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0063] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0064] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0065] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, 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 terms in the embodiments of the present application can be understood according to the specific circumstances.

[0066] At present, from the development of market situation, the application of battery device is more and more extensive. The battery device 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, military equipment, aerospace and other fields. With the continuous expansion of the application field of battery device, the market demand is also increasing.

[0067] In related technologies, the battery device includes a housing and multiple battery cells. The multiple battery cells are installed inside the housing and connected to the bottom plate of the housing. A heating film is installed between the bottom plate and the multiple battery cells to heat the battery cells. However, the position of the heating film prevents the battery cells from being directly connected to the housing, resulting in poor connection strength between the battery cells and the bottom plate, which makes it easy for the battery cells to detach from the bottom plate.

[0068] To address the aforementioned issues, this application provides a battery device comprising a housing, an electric heating element, and multiple battery cells. The housing includes multiple wall panels that enclose a receiving space. Each wall panel includes a base plate. The multiple battery cells are disposed within the receiving space and directly connected to the base plate. At least the base plate contains the electric heating element, which heats at least a portion of the battery cells. By placing the electric heating element within the base plate, this application reduces the obstruction between the base plate and the battery cells, thereby increasing the contact area between them. This enhances the connection strength between the base plate and the battery cells, reducing the likelihood of battery cells detaching from the base plate.

[0069] The technical solutions described in this application are not limited to the devices described above, but can also be applied to all devices that use battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0070] For example, such as Figure 1 The diagram shown is a structural schematic of a vehicle according to one embodiment of this application. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle's interior can include a motor 300, a controller 200, and a battery device 100. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, it can serve as the vehicle's operating power source for the vehicle's electrical system, such as for the power requirements of starting, navigation, and operation. In another embodiment of this application, the battery device 100 can not only serve as the vehicle's operating power source but also as the vehicle's driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0071] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 20, which are connected in series, parallel, or mixed connections via busbars.

[0072] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells 20.

[0073] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells 20 into one independent module. As an example, the battery module can be formed by bundling a plurality of battery cells 20 with a cable tie.

[0074] In some embodiments, the battery device 100 can be a battery pack, which includes a case 10 and one or more battery cell assemblies accommodated in the case 10.

[0075] As an example, the battery cell assembly can be a battery module, which can be accommodated in the case 10 by fixing the battery module in the case 10.

[0076] As an example, the battery cell assembly can also be accommodated in the case 10 by directly fixing a plurality of battery cells 20 in the case 10.

[0077] As an example, the case 10 can include a first case and a second case. The first case and the second case are fastened so that an enclosed space is formed inside the case 10 to accommodate the battery cell assembly. Here, the enclosed means covered or closed, which can be sealed or unsealed. The first case can be a top cover or a bottom plate.

[0078] As an example, the case 10 can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame so that an enclosed space is formed inside the case 10 to accommodate the battery cell assembly.

[0079] In some embodiments, the case 10 can be part of the chassis structure of the vehicle 1000. For example, part of the case 10 can be at least part of the floor of the vehicle 1000, or part of the case 10 can be at least part of the cross beam and the longitudinal beam of the vehicle 1000.

[0080] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells 20, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships, and spacecraft, such as aircraft, rockets, space shuttles, and spacecraft.

[0081] In some embodiments of the present application, the battery cell 20 can be a secondary battery, which means that the battery cell 20 can be activated by charging after discharging.

[0082] The battery cell 20 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 present application is not limited thereto.

[0083] In some embodiments of the present application, the battery cell 20 includes a housing, a pressure relief mechanism, an electrode assembly, and an insulating member. The housing includes a plurality of wall panels, including a first wall panel, and the pressure relief mechanism is disposed on the first wall panel. The pressure relief mechanism is configured to open or close according to whether the internal pressure of the housing reaches a pressure threshold. The electrode assembly is disposed inside the housing, and the insulating member is disposed inside the housing and between the housing and the electrode assembly to insulate and separate the housing and the electrode assembly. The insulating member abuts the electrode assembly.

[0084] As an example, the battery cell 20 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shaped battery cell. The prismatic battery cell includes a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal prismatic battery cell, etc., and the present application is not particularly limited.

[0085] The electrode assembly includes a positive electrode, a negative electrode, and a separator disposed between the negative electrode and the positive electrode. During charging and discharging of the battery cell 20, 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 to prevent short circuiting of the positive and negative electrodes while allowing the active ions to pass through.

[0086] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0087] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction thereof, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0088] As an example, the positive electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, surface-treated metals, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver, etc. can be used. 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.).

[0089] As an example, the positive electrode 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 battery positive electrode active material can also be used. These positive electrode active materials can be used alone only or in combination of two or more. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFeP04(also can be referred to as LFP)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnP04), a composite of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, at least one of lithium cobalt oxide (such as LiCo02), lithium nickel oxide (such as LiNi02), lithium manganese oxide (such as LiMn02, LiMn204), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2(also can be referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2(also can be referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2(also can be referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 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 0.8 Co 0.15 Al 0.05 O2), and a modified compound thereof, and the like. The modified compound refers to a substance obtained by a modification means such as doping or coating on the basis of the above-mentioned substance.

[0090] In some embodiments, the positive electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When the foamed metal is used as the positive electrode, the foamed metal surface can not be provided with the positive electrode active material, or of course can be provided with the positive electrode active material. As an example, the positive electrode active material is filled or / and deposited in the foamed metal.

[0091] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0092] As an example, the negative electrode current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver, 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 (copper, copper 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.).

[0093] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0094] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is disposed on either one or both of the two opposite surfaces of the negative electrode current collector.

[0095] As an example, the negative electrode active material can employ a negative electrode active material for a battery cell 20 known in the art. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative electrode active material for a battery cell 20 can also be used. These negative electrode active materials can be used alone only one or in combination of two or more.

[0096] In some embodiments, the negative electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When the foamed metal is used as a negative electrode sheet, the surface of the foamed metal can not be provided with a negative electrode active material, or of course, can be provided with a negative electrode active material.

[0097] As an example, the negative electrode active material can be filled or / and deposited in the negative electrode current collector.

[0098] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0099] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0100] In some embodiments, the separator is a separator film. The type of the separator film is not particularly limited in the present application, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0101] For example, the main material of the separator film can be selected from 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, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. 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. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can be applied to the surface of the separator film.

[0102] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is provided between the positive and negative electrodes, and functions to transport ions and separate the positive and negative electrodes.

[0103] The electrode assembly can have a roll structure, a stack structure, or a hybrid structure of a roll and a stack.

[0104] In some embodiments, the electrode assembly has a roll structure. The positive electrode sheet and the negative electrode sheet are wound to form the roll structure.

[0105] In some embodiments, the electrode assembly has a stack structure.

[0106] For example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be alternately stacked.

[0107] For example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded sections stacked one on another, with one positive electrode sheet interposed between adjacent folded sections.

[0108] For example, both the positive electrode sheet and the negative electrode sheet can be folded to form a plurality of folded sections stacked one on another.

[0109] For example, a plurality of separators can be provided, and each of the plurality of separators can be interposed between any adjacent positive electrode sheet or negative electrode sheet.

[0110] For example, the separators can be continuously provided and interposed between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0111] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a polygonal shape.

[0112] In some embodiments, the electrode assembly can have a tab provided on the electrode sheet. The tab can be used to guide current out of the electrode assembly. The tab can include a positive tab and a negative tab.

[0113] In some embodiments, a pressure relief mechanism is provided on the housing. The pressure relief mechanism is configured to release the internal gas of the battery cell 20.

[0114] As an example, the pressure relief mechanism is actuated to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 20 reaches the predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is broken, thereby forming an opening or a passage for the internal pressure or temperature to be released. The threshold is designed differently according to design requirements. The threshold can depend on the material of one or more of the positive electrode sheet, the negative electrode sheet, the electrolyte, and the separator in the battery cell 20.

[0115] As an example, the pressure relief mechanism can be integrally formed with the housing.

[0116] As an example, the pressure relief mechanism can also be provided separately from the housing and connected to the housing.

[0117] As used herein, "actuation" refers to the pressure relief mechanism performing an action or being activated to a certain state, thereby allowing the internal pressure and temperature of the battery cell 20 to be released. The action performed by the pressure relief mechanism can include, but is not limited to, a component in the pressure relief mechanism moving to form an exhaust passage, at least a portion of the pressure relief mechanism breaking, shattering, being torn or opened, and the like. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell 20 are discharged as exhaust from the actuated part. In this way, the battery cell 20 can be pressure released and temperature released under controllable pressure or temperature, thereby reducing the potential for more serious accidents.

[0118] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be provided as a through hole for releasing the gas inside the battery cell 20.

[0119] As used herein, the exhaust from the battery cell 20 includes, but is not limited to, electrolyte, dissolved or split positive and negative electrode sheets, fragments of the separator, high-temperature and high-pressure gas generated by the reaction, flames, and the like.

[0120] The positive and negative electrode tabs can be led out from the same end of the electrode sheet, or can be led out from opposite ends of the electrode sheet, respectively.

[0121] The positive and negative electrode tabs can have the same or different structures. As an example of the positive electrode tab, the positive electrode tab can include a plurality of positive electrode tab layers stacked together to form the positive electrode tab. The positive electrode tab can include at least two parts, one part between the main body of the electrode sheet and the insulating member, and the other part between the insulating member and the electrode lead-out member.

[0122] The insulating piece can insulate at least part of the tab from the end face of the body part, thereby reducing the risk of the tab being inserted into the body part when the battery monomer 20 is affected by external impact, vibration, etc., thereby reducing the risk of short circuit of the battery monomer 20, and facilitating improvement of the reliability of the battery monomer 20.

[0123] The insulating piece can be of an integral structure or a split structure. As an example, the insulating piece is connected by a plurality of independently formed parts. As another example, the insulating piece is integrally formed by stamping.

[0124] For example, the insulating piece is a plastic piece, and the plastic piece is integrally formed by injection molding. The plastic piece is convenient to process, and the manufacturing cost of the plastic piece is relatively low.

[0125] In some embodiments of the present application, the shell includes a housing and an end cover, the housing has an opening, the end cover is connected to the housing and closes the opening, the end cover constitutes a first wall plate, and the pressure relief mechanism is arranged on the end cover.

[0126] In some embodiments of the present application, the shell can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc. In some embodiments, the shell can be a sealed structure or a non-sealed structure. As an example, when the shell is a non-sealed structure, the shell serves to protect the electrode assembly, and a sealing bag is further included between the shell and the electrode assembly, the sealing bag being used to package the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating piece or an aluminum-plastic film. When the shell is a sealed structure, it is used to package the electrode assembly, the electrolyte, etc. The housing can be provided with one or more openings. The end cover can also be provided with one or more openings.

[0127] In addition, the connection mode between the end cover and the housing includes but is not limited to clamping, bonding, welding, or connection through a connecting piece.

[0128] In some embodiments of the present application, the battery monomer 20 further includes an electrode terminal, the electrode terminal being arranged on the end cover and electrically connected to the electrode assembly. The electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab, or indirectly connected to the tab through a current collecting member. The electrode terminal can be arranged on the end cover or on the housing. In the embodiments shown in the present application, the electrode terminal is arranged on the end cover.

[0129] For example, the electrode terminal is a metal terminal, and the metal terminal is integrally formed with the end cover by stamping. The metal terminal is convenient to process, and the manufacturing cost of the metal terminal is relatively low. Figures 2 to 10As shown, in some embodiments of the present application, a battery device 100 is provided, which comprises a box body 10, an electric heating element 40 and a plurality of battery cells 20. The box body 10 comprises a plurality of wall plates 11, which enclose a containing space. The plurality of wall plates 11 comprises a bottom plate 12. The plurality of battery cells 20 are arranged in the containing space and are directly connected to the bottom plate 12. The electric heating element 40 is arranged in at least the bottom plate 12, and is used to heat at least part of the plurality of battery cells 20.

[0130] Specifically, the containing space enclosed by the plurality of wall plates 11 is a closed space. After the plurality of battery cells 20 are arranged in the containing space, the plurality of battery cells 20 are isolated from the outside, so as to reduce the adverse effects (such as short circuit) of the external environment (such as water) on the battery cells 20.

[0131] The containing space enclosed by the plurality of wall plates 11 can have a regular shape (such as spherical, ellipsoidal, cylindrical, cuboid or cubic), or a non-regular shape (such as a combination of cuboid and cylinder).

[0132] After the plurality of battery cells 20 are arranged in the containing space, the bottom plate 12 supports the plurality of battery cells 20. The plurality of battery cells 20 are connected to the bottom plate 12 in various ways, including but not limited to adhesion, welding, clamping or fastening.

[0133] The electric heating element 40 is arranged in the bottom plate 12. The electric heating element 40 can generate heat in an energized state. The generated heat can heat the battery cells 20 in the containing space. When the electric heating element 40 is running, the electric heating element 40 can heat part of the plurality of battery cells 20, or all of the plurality of battery cells 20.

[0134] When the battery cells 20 need to be heated, the electric heating element 40 is running. The electric heating element 40 can exchange heat with the battery cells 20 through the bottom plate 12, so as to heat the battery cells 20. The electric heating element 40 can also be in heat-conducting connection with the battery cells 20 through other heat-conducting elements, so as to heat the battery cells 20.

[0135] In the present application, the electric heating element 40 is arranged in the bottom plate 12, which reduces the obstruction of the electric heating element 40 between the bottom plate 12 and the battery cells 20, thereby increasing the contact area between the bottom plate 12 and the battery cells 20, and further improving the connection strength between the bottom plate 12 and the battery cells 20, and reducing the situation that the battery cells 20 fall off the bottom plate 12.

[0136] It should be noted that the electric heating element 40 can be an electric heating plate, an electric heating sheet or an electric heating wire, etc.

[0137] In some embodiments of the present application, the electric heating element 40 is an electric heating wire.

[0138] Specifically, the electric heating element 40 is arranged as an electric heating wire, the volume of which is small and can be adjusted according to the heating requirement, facilitating the arrangement and installation of the electric heating element 40 in the wall plate 11, thereby improving the convenience of assembly.

[0139] It should be understood that the electric heating wire is a high-resistance conductor, which generates heat when electrified, thereby heating the battery monomer 20 by using the generated heat.

[0140] It should be pointed out that the shape of the cross section of the electric heating wire includes but is not limited to a circle, an ellipse or a polygon, etc.

[0141] In some embodiments of the present application, as shown in Figures 4 to 10 The wall plate 11 provided with the electric heating element 40 is provided with a groove 15 on the side facing the accommodation space, and the groove 15 is formed by removing material or non-removing material, and all the grooves 15 are embedded with the electric heating element 40.

[0142] Specifically, among the plurality of wall plates 11, the bottom plate 12 is internally provided with the electric heating element 40, wherein the surface of the bottom plate 12 facing the accommodation space is provided with a groove 15, and the electric heating element 40 is embedded and installed in the groove 15, and the groove 15 is used to accommodate the electric heating element 40, thereby reducing the interference of the electric heating element 40 on the battery monomer 20, and increasing the contact area between the battery monomer 20 and the bottom plate 12, so as to increase the connection strength between the battery monomer 20 and the bottom plate 12, and effectively reduce the situation that the battery monomer 20 and the bottom plate 12 are separated due to vibration, etc.

[0143] In addition, the groove 15 is provided, and the electric heating element 40 is embedded and installed in the groove 15, which can effectively improve the convenience during assembly, thereby effectively shortening the assembly time and accelerating the production rhythm.

[0144] It should be understood that in the present application, the groove 15 is formed on the wall plate 11 by removing material (such as milling or planing, etc.) or non-removing material (such as stamping or aluminum extruded profile, etc.), which facilitates the machining of the groove 15 on the wall plate 11, thereby improving the convenience of machining and reducing the manufacturing cost.

[0145] In some embodiments of the present application, as shown in Figure 5 or Figure 10As shown, the groove 15 includes a first section 151 and a second section 152, the first section 151 is in a plurality, and the plurality of first sections 151 are arranged in parallel and at intervals, and two adjacent first sections 151 are connected by a second section 152.

[0146] In the present application, at least the inner part of the bottom plate 12 of the plurality of wall plates 11 is provided with an electric heating element 40, and the bottom plate 12 is taken as an example:

[0147] The groove 15 is arranged on the surface of the bottom plate 12 facing the accommodation space, and the electric heating element 40 is embedded in all the grooves 15. The groove 15 includes multiple parts, i.e. multiple first sections 151 and second sections 152. Among them, the plurality of first sections 151 are arranged in parallel and at intervals, and the interval mode includes but is not limited to equal interval or unequal interval. Two adjacent first sections 151 are connected by a second section 152, so as to increase the length of the electric heating element 40 arranged in the bottom plate 12, and at the same time, the electric heating element 40 can be arranged dispersedly on the bottom plate 12. In this way, the heating effect of the plurality of battery monomers 20 in the box body 10 can be improved, and the uniformity of the heating of the battery monomers 20 can be effectively improved.

[0148] It should be pointed out that in the present application, the shape of the bottom plate 12 is rectangular, and the first section 151 can be arranged along the length direction of the rectangle or along the width direction of the rectangle. When the first section 151 is arranged along the length direction of the rectangle, the distance between the opposite ends of the first section 151 and the edges of the bottom plate 12 is within the range of 5mm to 50mm, so that the first section 151 can have sufficient length. In addition, in the width direction of the rectangle, the plurality of first sections 151 are arranged at equal intervals, and the distance between the edges of the first section 151 and the bottom plate 12 is equal to the distance between two adjacent first sections 151.

[0149] In addition, the number of first sections 151 can be two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, etc. The number of second sections 152 is one less than the number of first sections 151.

[0150] In addition, along the length direction of the first section 151, the second section 152 can be connected to the end of the first section 151, and the second section 152 can also be connected to the region between the two ends of the first section 151.

[0151] In some embodiments of the present application, as shown in Figure 5 or Figure 10 As shown, the number of first sections 151 is at least three, the number of second sections 152 is a plurality and less than the number of first sections 151, and along the arrangement direction of the plurality of first sections 151, two adjacent second sections 152 are respectively connected to the opposite ends of the same first section 151.

[0152] In this way, the groove 15 is arranged in a serpentine structure, so that the electric heating element 40 embedded in the groove 15 is also arranged in a serpentine structure, thereby enabling the electric heating element 40 to be more evenly distributed on the wall plate 11 and further improving the heating effect on the battery monomer 20.

[0153] In some embodiments of the present application, the first section 151 is a straight section (as shown in Figure 5 or Figure 10 a curved section.

[0154] In the present application, the first section 151 is arranged as a straight section or a curved section, which can be arranged according to the needs of the structure of the first section 151 to enable the electric heating element 40 to better heat the battery monomer 20.

[0155] In some embodiments of the present application, the second section 152 is a straight section (as shown in Figure 5 or Figure 10 a curved section.

[0156] In the present application, the second section 152 is arranged as a straight section or a curved section, which can be arranged according to the needs of the structure of the second section 152 to enable the electric heating element 40 to better heat the battery monomer 20.

[0157] In some embodiments of the present application, as shown in Figure 6 , Figure 7 and Figure 10 , the groove 15 further comprises a third section 153, one of the first sections 151 located at the outermost side is connected to the third section 153, one end of the electric heating element 40 is embedded in the third section 153, and the other end of the electric heating element 40 is embedded in another one of the first sections 151 located at the outermost side, wherein the third section 153 is arranged at an angle with the first section 151.

[0158] In the present application, by arranging the third section 153, the end of the electric heating element 40 can be arranged according to the needs of the battery device 100, so as to facilitate the wiring operation of the electric heating element 40.

[0159] It should be understood that the angle between the third section 153 and the first section 151 is not 0° or 180°. In the present application, the angle between the third section 153 and the first section 151 is 90°, and the third section 153 extends to the inside of the arrangement structure formed by the plurality of first sections 151, the first section 151 is arranged at intervals with the second section 152, and the arrangement of the third section 153 can further increase the length of the electric heating element 40 and increase the heating capacity of the battery monomer 20.

[0160] In addition, the tail end of the electric heating element 40 refers to the region near the two ends of the electric heating element 40, and the tail end of the electric heating element 40 needs to be connected with a wire so that the electric heating element 40 can be electrified to realize the heating operation of the battery monomer 20.

[0161] In some embodiments of the present application, as shown in Figure 3 and Figure 4 one tail end of the electric heating element 40 is embedded in the outermost one of the plurality of first sections 151, and the other tail end of the electric heating element 40 is embedded in the outermost one of the plurality of first sections 151.

[0162] In the present application, by setting one tail end of the electric heating element 40 to be embedded in the outermost one of the plurality of first sections 151 and the other tail end of the electric heating element 40 to be embedded in the outermost one of the plurality of first sections 151, the tail end of the electric heating element 40 can be set according to the needs of the battery device 100 to facilitate the wiring operation of the electric heating element 40.

[0163] In some embodiments of the present application, the bottom of each battery monomer 20 is provided with at least one groove 15.

[0164] In the present application, by providing at least one groove 15 at the bottom of each battery monomer 20, the electric heating element 40 and the battery monomer 20 can have sufficient contact area, further increasing the heat exchange effect of the battery.

[0165] It should be noted that the number of segments of the groove 15 corresponding to the bottom of each battery monomer 20 can be one, two, three, four or five.

[0166] In some embodiments of the present application, the wall plate 11 forms the groove 15 by milling, planing, stamping or aluminum extrusion profile.

[0167] Specifically, in the present application, the wall plate 11 is provided to form the groove 15 by milling, planing, stamping or aluminum extrusion profile, which facilitates the processing of the groove 15 on the wall plate 11, thereby improving the convenience of processing and reducing the manufacturing cost.

[0168] In some embodiments of the present application, the electric heating element 40 is arranged in the groove 15 by clamping, bonding, welding or connecting through a connecting piece.

[0169] In the present application, by setting the electric heating element 40 in the recess 15 by clamping, bonding, welding or connecting through a connecting piece, the way the electric heating element 40 is fixed in the recess 15 can be set according to the assembly requirements, thereby improving the convenience of assembly and speeding up the production rhythm.

[0170] In some embodiments of the present application, as shown in Figure 9 , the entire body of the electric heating element 40 is accommodated in the recess 15.

[0171] In the present application, by setting the electric heating element 40 with the entire body accommodated in the recess 15 (i.e. the electric heating element 40 is not protruding relative to the recess 15), the protrusion of the electric heating element 40 relative to the recess 15 is reduced, the interference of the electric heating element 40 to the battery monomer 20 is reduced, and the connection strength between the battery monomer 20 and the bottom plate 12 is further improved.

[0172] In some embodiments of the present application, as shown in Figure 3 , Figure 4 , Figures 6 to 9 , the battery device 100 further comprises a heat-conducting structure 30, the heat-conducting structure 30 closes the slot of the recess 15, and the electric heating element 40 is in heat-conducting connection with the battery monomer 20 through the heat-conducting structure 30.

[0173] In the present application, by setting the heat-conducting structure 30, on the one hand, the electric heating element 40 can be enclosed in the recess 15 to fix the position of the electric heating element 40, and on the other hand, the heat-conducting structure 30 can realize the heat conduction between the electric heating element 40 and the battery monomer 20, thereby increasing the heat exchange efficiency between the electric heating element 40 and the battery monomer 20, and improving the heating effect of the battery monomer 20.

[0174] In some embodiments of the present application, the heat-conducting structure 30 is a heat-conducting glue or a heat-conducting pad.

[0175] In the present application, by setting the heat-conducting structure 30 as a heat-conducting glue or a heat-conducting pad, the structure can be simplified, and the manufacturing cost can be effectively reduced.

[0176] In addition, when the heat-conducting structure 30 is a heat-conducting glue, the electric heating element 40 can be fixed in the recess 15 through the heat-conducting glue.

[0177] In some embodiments of the present application, as shown in Figure 3 , Figures 6 to 10 , the plurality of wall plates 11 further comprise a top plate 13 and a plurality of side plates 14, the top plate 13 is arranged above the bottom plate 12 in a spaced manner, the plurality of side plates 14 are sequentially connected and arranged, the plurality of side plates 14 are connected with the top plate 13 and the bottom plate 12 respectively to enclose a containing space, and the electric heating element 40 is arranged in at least part of the plurality of side plates 14.

[0178] In the present application, by arranging the heating element in the side plate 14, heating can be achieved on the side of the battery monomer 20, the temperature difference of the battery monomer 20 is reduced, and the battery monomer 20 can be uniformly heated.

[0179] As shown in Figures 1 to 10 the second aspect of the present application provides a power consuming device, the power consuming device comprising the battery device 100 as above.

[0180] In the battery device 100 of the power consuming device, by arranging the electric heating element 40 in the bottom plate 12, the shielding between the electric heating element 40 and the bottom plate 12 and the battery monomer 20 is reduced, the contact area between the bottom plate 12 and the battery monomer 20 is increased, the connection strength between the bottom plate 12 and the battery monomer 20 is improved, and the situation that the battery monomer 20 falls off the bottom plate 12 is reduced.

[0181] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described.

[0182] In the embodiments of the present application, as shown in Figures 2 to 10 the present application provides a battery device 100, the battery device 100 comprising a box 10, an electric heating element 40 and a plurality of battery monomers 20, the box 10 comprising a plurality of wall plates 11, the plurality of wall plates 11 enclosing a containing space, the plurality of wall plates 11 comprising a bottom plate 12, the plurality of battery monomers 20 being arranged in the containing space and directly connected to the bottom plate 12, at least the bottom plate 12 being provided with the electric heating element 40, and the electric heating element 40 being used for heating at least part of the plurality of battery monomers 20. Wherein, the electric heating element 40 is an electric heating wire. The plurality of wall plates 11 further comprise a top plate 13 and a plurality of side plates 14, the top plate 13 being arranged above the bottom plate 12 in a spaced manner, the plurality of side plates 14 being arranged in sequence, and the plurality of side plates 14 being connected to the top plate 13 and the bottom plate 12 respectively to enclose the containing space, and at least part of the plurality of side plates 14 being provided with the electric heating element 40.

[0183] Further, the side of the wall plate 11 provided with the electric heating element 40 facing the containing space is provided with a groove 15, and the wall plate 11 forms the groove 15 by removing material or non-removing material, and all the grooves 15 are embedded with the electric heating wire.

[0184] Further, the groove 15 on the bottom plate 12 comprises a first section 151 and a second section 152, the number of the first sections 151 and the second sections 152 is multiple, the number of the second sections 152 is one less than the number of the first sections 151, the multiple first sections 151 are arranged in parallel and spaced apart, and two adjacent first sections 151 are connected by a second section 152. Along the arrangement direction of the multiple first sections 151, two adjacent second sections 152 are respectively connected to opposite ends of the same first section 151. The first section 151 is a straight section, and the second section 152 is a straight section. One tail end of the electric heating element 40 is embedded in one outermost first section 151 of the multiple first sections 151, and the other tail end of the electric heating element 40 is embedded in another outermost first section 151 of the multiple first sections 151.

[0185] Further, based on the structure of the groove 15 on the bottom plate 12, the groove 15 on the side plate 14 further comprises a third section 153, one outermost first section 151 of the multiple first sections 151 is connected to the third section 153, one tail end of the electric heating element 40 is embedded in the third section 153, and the other tail end of the electric heating element 40 is embedded in another outermost first section 151 of the multiple first sections 151, wherein the third section 153 is arranged at an angle with the first section 151.

[0186] Further, the bottom of each battery monomer 20 is provided with at least one groove 15.

[0187] Further, the wall plate 11 is formed with the groove 15 by milling, planing, stamping or aluminum extrusion profile.

[0188] Further, the electric heating element 40 is arranged in the groove 15 by clamping, bonding, welding or connecting through a connecting piece. In this way, the way of fixing the electric heating element 40 in the groove 15 can be set according to the assembly requirements, thereby improving the convenience of assembly and speeding up the production rhythm.

[0189] In some embodiments of the present application, the entire body of the electric heating element 40 is accommodated in the groove 15. The battery device 100 further comprises a heat-conducting structure 30, the heat-conducting structure 30 is heat-conducting glue and seals the slot of the groove 15, and the electric heating element 40 is in heat-conducting connection with the battery monomer 20 through the heat-conducting structure 30.

[0190] In this way, the side of the battery monomer 20 can be heated, and the battery monomer 20 can be uniformly heated.

[0191] In the present application, by arranging the electric heating element 40 in the bottom plate 12, the electric heating element 40 reduces the shielding between the bottom plate 12 and the battery monomer 20, thereby increasing the contact area between the bottom plate 12 and the battery monomer 20, and further improving the connection strength between the bottom plate 12 and the battery monomer 20, and reducing the situation that the battery monomer 20 and the bottom plate 12 fall off.

[0192] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, The battery device includes: The box body includes multiple wall panels that enclose an accommodating space, and the multiple wall panels include a bottom plate; Multiple battery cells are disposed within the housing and directly connected to the base plate; An electric heating element is provided in at least one of the base plates among the plurality of wall panels, and the electric heating element is used to heat at least a portion of the battery cells.

2. The battery device as claimed in claim 1, characterized in that, The electric heating element is an electric heating wire.

3. The battery device as claimed in claim 1, characterized in that, The wall panel with the electric heating element has a groove on the side facing the receiving space. The groove is formed by removing or not removing material from the wall panel, and the electric heating element is embedded in all of the grooves.

4. The battery device as claimed in claim 3, characterized in that, The groove includes: The first segment, there are multiple first segments, and the multiple first segments are set in parallel and spaced apart; The second segment consists of two adjacent first segments connected by a second segment.

5. The battery device as claimed in claim 4, characterized in that, The number of the first segments is at least three, and the number of the second segments is multiple and less than the number of the first segments. Along the arrangement direction of the multiple first segments, two adjacent second segments are respectively connected to opposite ends of the same first segment.

6. The battery device as claimed in claim 4, characterized in that, The first segment is either a straight line segment or a curved segment; And / or, the second segment is a straight line segment or a curved segment.

7. The battery device as claimed in claim 4, characterized in that, The groove further includes a third segment, and the outermost first segment among the plurality of first segments is connected to the third segment. One tail end of the electric heating element is embedded in the third segment, and the other tail end of the electric heating element is embedded in the outermost first segment among the plurality of first segments. The third segment is set at an angle to the first segment. Alternatively, one end of the electric heating element is embedded in the outermost of the plurality of first segments, and the other end of the electric heating element is embedded in the outermost of the plurality of first segments.

8. The battery device as claimed in claim 3, characterized in that, Each of the battery cells has at least one groove at its bottom; And / or, the groove is formed in the wall panel by milling, planing, stamping or aluminum extrusion.

9. The battery device as claimed in claim 3, characterized in that, The electric heating element is installed in the groove by means of snap-fitting, bonding, welding or connection via connectors.

10. The battery device as claimed in claim 3, characterized in that, The entire body of the electric heating element is housed within the groove.

11. The battery device as claimed in claim 10, characterized in that, The battery device further includes a heat-conducting structure that closes the opening of the groove, and the electric heating element is thermally connected to the battery cell through the heat-conducting structure.

12. The battery device as claimed in claim 11, characterized in that, The thermally conductive structure is a thermally conductive adhesive or a thermally conductive pad.

13. The battery device according to any one of claims 1 to 12, characterized in that, The plurality of wall panels also include: A top plate, which is spaced above the bottom plate; Multiple side plates are connected in sequence and are respectively connected to the top plate and the bottom plate to enclose the receiving space. At least a portion of the side plates are provided with the electric heating element.

14. An electrical appliance, characterized in that, The electrical equipment includes the battery device according to claim 13.

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