Battery device, heating component, electric device and energy storage device

Abstract

The utility model discloses a battery device, a heating component, a power utilization device and an energy storage device. The battery device comprises a box body, a battery monomer assembly and a heating part, a containing space is formed in the box body. The battery monomer assembly is located in the containing space and comprises a plurality of battery monomers arranged in rows, and the arrangement direction of the battery monomers intersects with the height direction of the box body. The heating part is located in the accommodating space, the heating part comprises a heating piece, the heating piece is arranged to emit heat and heat the single batteries in a power-on state, the heating piece comprises a straight heating section, the straight heating section extends in the arrangement direction of the single batteries, and the straight heating section is used for heating the single batteries. On the premise that the heating area of the heating element is not changed, the projection area of the heating element in the height direction of the box body can be increased by increasing the area of the overflowing cross section of the heating element, so that the probability that the heating element is damaged due to the fact that the area of the overflowing cross section of the heating element is too small and the heating element is cut by foreign matter in the box body is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of batteries, in particular to a battery device, a heating component, a power utilization device and an energy storage device. BACKGROUND

[0002] When the battery monomers in the box of the battery work at low temperature, the performance of the battery is easily reduced due to the influence of the low-temperature environment. The currently used heating component heats the battery monomers, and the heating component has the problem of poor reliability. CONTENT OF THE UTILITY MODEL

[0003] In view of the above problems, the application provides a battery device, a heating component, a power utilization device and an energy storage device, which can improve the reliability of the working of the heating component.

[0004] In a first aspect, the application provides a heating component, comprising:

[0005] a box, the inside of the box having a containing space;

[0006] a battery monomer assembly located in the containing space, the battery monomer assembly comprising a plurality of arranged battery monomers, the arrangement direction of the plurality of battery monomers intersecting with the height direction of the box;

[0007] a heating component located in the containing space, the heating component comprising a heating element, the heating element being arranged to heat and heat the battery monomers in a powered state, the heating element comprising a straight heating section, the straight heating section extending along the arrangement direction of the plurality of battery monomers, the straight heating section being used to heat the plurality of battery monomers.

[0008] The straight heating section is used to heat the plurality of battery monomers, which can reduce the bending of the heating element, so that the length of the heating element can be made shorter. Under the premise that the heating area of the heating element remains unchanged, the projection area of the heating component along the height direction of the box can be increased by increasing the area of the flow passage cross section of the heating element, so that the heating area of the heating element remains unchanged, and increasing the area of the flow passage cross section can improve the strength of the heating element, so as to reduce the probability of damage to the heating element caused by the flow passage cross section of the heating element being too small and being cut by foreign matter in the box, thereby improving the poor reliability of the working of the heating element.

[0009] In some embodiments, the number of straight heating sections is a plurality, and the heating element further comprises a bending section, and in the plurality of straight heating sections, two adjacent straight heating sections are connected in series through the bending section.

[0010] The two adjacent straight heating sections are connected in series through the bending section, which can increase the length of the heating element, so as to improve the resistance of the heating element, so that the resistance value of the heating element can be changed according to the actual heating demand, and the plurality of straight heating sections can heat the plurality of battery monomers together, so as to increase the heating area of the heating element.

[0011] In some embodiments, the plurality of straight heating sections are arranged in rows, and the arrangement direction of the plurality of straight heating sections intersects with the arrangement direction of the plurality of battery monomers.

[0012] Thus, compared with the structure in which the arrangement direction of the plurality of straight heating sections is the same as the length direction of the straight heating sections, the heating component structure can be more compact, the space occupied by the heating component can be reduced, the space utilization of the box body can be improved, and each straight heating section can heat a plurality of battery monomers, the bending of the heating component can be reduced, the area of the flow passage cross section of the heating component can be made larger under the premise that the heating area of the heating component is unchanged, the probability that the flow passage cross section of the heating component is damaged by foreign matter in the box body can be reduced, and the working reliability of the heating component can be improved.

[0013] In some embodiments, at least one of the bending sections and the straight heating sections is a flat structure, and the thickness direction of the flat structure is the same as the thickness direction of the side wall of the box body.

[0014] Thus, the heating component can be made thinner to reduce the space occupied by the heating component in the box body, improve the space utilization of the box body, and at least one of the bending sections and the straight heating sections can be made wider to make the heating component have a certain strength, reduce the probability that the heating component is damaged by foreign matter in the box body, and improve the poor working reliability of the heating component.

[0015] In some embodiments, the number of bending sections is N, N is an integer, and the value range of N is 2-40.

[0016] Under the premise that the resistance and resistivity of the heating component remain unchanged, as N increases, the heating component can be wound longer, in order to keep the resistance unchanged, the area of the flow passage cross section of the heating component needs to be increased, at this time, the material usage of the heating component is increased, the number of bends of the heating component is increased, the manufacturing process is more complex, and the manufacturing cost of the heating component is increased, in order to balance the structural strength of the heating component and the manufacturing cost of the heating component, the value range of N is set to 2-40.

[0017] In some embodiments, the value range of N is 2-8. In order to further reduce the manufacturing cost of the heating component and improve the structural strength of the heating component, the value range of N is set to 2-8.

[0018] In some embodiments, at least part of the side wall of the box body is connected with the heating component.

[0019] When the external environment is low temperature, the external environment exchanges heat with the battery monomer assembly through the side wall of the box, and the battery monomers adjacent to the side wall of the box are greatly affected, which easily causes the performance of the battery monomer assembly to decrease. The heating component is arranged on the side wall, so that the influence of the battery monomers adjacent to the side wall can be reduced when the external environment is low temperature, and the performance of the battery monomers can be improved.

[0020] In some embodiments, the side wall connected with the heating component has a dimension H1 along the height direction of the box, the overcurrent cross section of the heating element has a dimension H2 along the height direction of the box, and 5mm≤H2≤90%*H1.

[0021] Without changing the dimension of the heating element along the thickness direction of the side wall, when H2 is 5mm, the heating element has a certain strength, so that the probability of damage of the heating element by metal foreign matters in the box is reduced. With the increase of H2, the strength of the heating element is increased, and the dimension of the heating element along the height direction of the box is also increased. When H2 is greater than 90%*H1, the heating component is likely to exceed one end of the side wall of the box, and interference is likely to occur during assembly, which is not conducive to assembly. Therefore, the value range of H2 is set to 5mm-90%*H1.

[0022] In some embodiments, 5mm≤H2≤80%*H1. Without changing the dimension of the heating element along the thickness direction of the side wall, the heating element has a certain strength, so that the probability of damage of the heating element by metal foreign matters in the box is reduced, and the probability of the heating element exceeding one end of the side wall of the box is reduced, so as to facilitate assembly.

[0023] In some embodiments, the box has a structural beam, the number of the structural beam is one, the structural beam and the side wall of the box enclose a containing space, and the structural beam is connected with the heating component.

[0024] When the external environment is low temperature, the side wall of the box transmits cold to the battery monomer assembly through the structural beam. The structural beam is provided with the heating component, and the battery monomer assembly is heated by the heating component, so that the influence of the structural beam on the temperature of the battery monomer assembly is reduced.

[0025] In some embodiments, the box has a structural beam, the number of the structural beam is one, the structural beam and the side wall of the box enclose a containing space, and the structural beam is connected with the heating component.

[0026] When the external environment is low temperature, the side wall of the box body can transmit cold to the battery monomer assembly through the structural beam adjacent to the side wall of the box body, and the structural beam adjacent to the side wall of the box body is provided with a heating component, and the battery monomer assembly is heated by the heating component, so that the influence of the structural beam on the temperature of the battery monomer assembly can be reduced.

[0027] In some embodiments, the resistivity of the heating element is P, and P is in the range of 2Ωmm 2 / m≤p≤50Ωmm 2 / m.

[0028] The resistivity of the heating element is set to 2Ωmm 2 / m-50Ωmm 2 / m, the heating element has high resistivity, so as to reduce the influence of increasing the area of the overcurrent section on the resistance value of the heating element, so that the heating element can heat the battery monomer within the preset resistance value, and the heating effect of the heating component on the battery monomer is improved.

[0029] In some embodiments, 5Ωmm 2 / m≤p≤15Ωmm 2 / m.

[0030] When P=5Ωmm 2 / m, the area of the overcurrent section of the heating element can be made larger under the condition that the resistance value of the heating element and the length of the heating element are unchanged, so as to meet the requirement of the cutting resistance of the heating element. With the increase of P, the area of the overcurrent section of the heating element can be made larger, but the manufacturing cost of the heating element also increases. In order to balance the manufacturing cost of the heating element and improve the cutting resistance of the heating element, the value range of P is set to 5Ωmm 2 / m-15Ωmm 2 / m.

[0031] In some embodiments, the heating element includes any one of an iron-aluminum alloy piece, a nickel-aluminum alloy piece and a nickel-chromium alloy piece.

[0032] When the length of the heating element is unchanged, increasing the area of the overcurrent section will reduce the resistance value of the heating element, so that the high-resistivity material can be selected to reduce the influence on the resistance value of the heating element.

[0033] In some embodiments, the heating component further includes a protective layer, the heating element is provided with the protective layer on two opposite sides, the protective layers on the two opposite sides of the heating element are connected to each other, the protective layer is in thermal conductive connection with the heating element, and the protective layer is in electrically insulated connection with the heating element.

[0034] The protective layer can protect the heating element, so as to reduce the probability of cutting the heating element, thereby improving the reliability of the working of the heating element.

[0035] In some embodiments, the protective layer on the first side of the heat-generating component along the thickness direction of the protective layer is a first protective layer, and the first protective layer comprises:

[0036] an insulating film layer, which is bonded to the heat-generating component;

[0037] a reinforcing layer, which is located on the side of the insulating film layer away from the heat-generating component.

[0038] When the heating component is in contact with the box, the insulating layer plays an insulating protective role for the heat-generating component, and the reinforcing layer and the insulating film layer play a double protective role for the heat-generating component, so as to reduce the probability of the heat-generating component being cut and thus provide the reliability of the heat-generating component.

[0039] In some embodiments, the first protective layer further comprises:

[0040] a bonding layer, which is located on the side of the reinforcing layer away from the heat-generating component, and is used to bond the reinforcing layer and the box.

[0041] Thus, the heating component can be fixed to the box through the bonding layer, so as to facilitate the installation of the heating component.

[0042] In a second aspect, the present application provides a heating component, which comprises a heat-generating component, and the heat-generating component is arranged to generate heat in a powered state. The heat-generating component comprises a bending segment and a plurality of straight heating segments. In the plurality of straight heating segments, two adjacent straight heating segments are connected in series through the bending segment.

[0043] The straight heating segments are used to heat a plurality of battery monomers, can reduce the bending of the heat-generating component, can make the length of the heat-generating component shorter, can keep the heating area of the heat-generating component unchanged by increasing the area of the overcurrent cross section of the heat-generating component under the premise that the heating area of the heat-generating component is unchanged, and can improve the cut resistance of the heat-generating component, so as to improve the reliability of the heat-generating component.

[0044] In some embodiments, the number of straight heating segments is a plurality, and the heat-generating component further comprises a bending segment. In the plurality of straight heating segments, two adjacent straight heating segments are connected in series through the bending segment.

[0045] The two adjacent straight heating segments are connected in series through the bending segment, which can increase the length of the heat-generating component, improve the resistance of the heat-generating component, and thus can change the resistance value of the heat-generating component according to the actual heating demand, and the plurality of straight heating segments can heat a plurality of battery monomers together, which can increase the heating area of the heat-generating component.

[0046] In some embodiments, at least one of the straight heating segments and the bending segment has a flat structure.

[0047] Therefore, the heating component can be made thinner to reduce the space occupied by the heating component in the thickness direction, and at least one of the bending section and the straight heating section can be made wider to make the heating element have a certain strength, improve the anti-cutting energy of the heating element, and improve the poor reliability of the heating element in operation.

[0048] In some embodiments, the resistivity of the heating element is P, and P is in the range of 2Ωmm 2 / m≤p≤50Ωmm 2 / m.

[0049] The resistivity of the heating element is set to 2Ωmm 2 / m-50Ωmm 2 / m, so that the heating element has high resistivity, the influence of increasing the area of the flow cross section on the resistance of the heating element is reduced, the heating element can heat the battery monomer within the preset resistance, and the heating effect of the heating component is improved.

[0050] In some embodiments, P is in the range of 5Ωmm 2 / m≤p≤15Ωmm 2 / m.

[0051] When P = 5Ωmm 2 / m, the area of the flow cross section of the heating element can be made larger under the condition that the resistance of the heating element and the length of the heating element are unchanged, to meet the demand of the anti-cutting of the heating element. With the increase of P, the area of the flow cross section of the heating element can be made larger, but the manufacturing cost of the heating element also increases. In order to balance the manufacturing cost of the heating element and improve the anti-cutting energy of the heating element, the value range of P is set to 5Ωmm 2 / m-15Ωmm 2 / m.

[0052] In some embodiments, the heating element includes any one of an iron-aluminum alloy, a nickel-aluminum alloy, and a nickel-chromium alloy.

[0053] When the length of the heating element is unchanged, increasing the area of the flow cross section will reduce the resistance of the heating element, so selecting a high-resistivity material can reduce the influence on the resistance of the heating element.

[0054] In some embodiments, the heating component further includes a protective layer, the heating element is provided with a protective layer on each side, the protective layers on the two opposite sides of the heating element are connected, the protective layer is in thermal conductive connection with the heating element, and the protective layer is in electrically insulated connection with the heating element.

[0055] The protective layer can protect the heating element to reduce the probability of the heating element being cut, thereby improving the reliability of the heating element in operation.

[0056] In a third aspect, the present application provides a power consuming device, comprising the battery device of the first aspect, and the battery device is configured to provide power to the power consuming device.

[0057] Since the power consuming device comprises all the technical features of the battery device, the effects are the same as described above, and will not be repeated here.

[0058] In a fourth aspect, the present application provides an energy storage device, comprising a cabinet and a battery cluster, the battery cluster is contained in the cabinet, and the battery cluster comprises a plurality of battery devices of the first aspect.

[0059] Since the energy storage device comprises all the technical features of the battery device, the effects are the same as described above, and will not be repeated here.

[0060] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described in detail. BRIEF DESCRIPTION OF DRAWINGS

[0061] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be limiting on the present application. Moreover, the same reference numerals are used to represent the same components throughout the drawings. In the drawings:

[0062] Figure 1 An exploded view of a battery cell according to an embodiment of the present application;

[0063] Figure 2 An exploded view of a battery device according to an embodiment of the present application;

[0064] Figure 3 A structural view of a power consuming device according to an embodiment of the present application, which is a vehicle;

[0065] Figure 4 An isometric view of a connection between a part of a cabinet and a heating component in a battery device according to an embodiment of the present application;

[0066] Figure 5 An exploded view of a heating component according to an embodiment of the present application;

[0067] Figure 6 A structural view of a heating element in a heating component according to an embodiment of the present application;

[0068] Figure 7 An isometric view of an energy storage device according to an embodiment of the present application.

[0069] The reference numerals in the detailed description of the embodiments are as follows:

[0070] 1000, vehicle;

[0071] 100, battery device;

[0072] 10, box; 11, first box; 111, structural beam; 112, containing space; 12, second box;

[0073] 20, battery cell assembly; 21, battery cell; 211, outer shell; 2111, end cap; 21111, electrode terminal; 212, electrode assembly; 213, pressure relief mechanism; 214, current collecting member;

[0074] 30, heating component; 31, heating element; 311, straight heating section; 312, bent section; 32, protective layer; 321, first protective layer; 3211, insulating film layer; 3212, reinforcing layer; 33, adhesive layer; 322, second protective layer;

[0075] 2000, energy storage device; 2100, cabinet body; 2200, battery cluster;

[0076] X, first direction; Z, height direction. DETAILED DESCRIPTION

[0077] 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.

[0078] 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.

[0079] 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 specified.

[0080] Reference to an "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment 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 one another. As will be apparent to one of ordinary skill in the art, embodiments described herein can be combined with other embodiments.

[0081] In the description of the embodiments of the 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 existing alone, A and B existing together, and B existing alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0082] In the description of the embodiments of the 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).

[0083] In the description of the embodiments of the 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 shown in the drawings, which is only for the convenience of describing the embodiments of the application and simplifying the description, and does 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 application.

[0084] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0085] When the battery monomer in the battery box works at low temperature, the performance of the battery is easily reduced due to the influence of the low temperature environment. The currently used heating component heats the battery monomer, and the heating component is usually a heating film. The resistance wire in the heating film is used to heat the battery monomer. The resistance wire is easily cut off by the metal foreign matter in the box, resulting in poor reliability of the heating component.

[0086] In view of this, the application provides a battery device, a straight heating section is used to heat a plurality of battery monomers, which can reduce the bending of the heating element, make the length of the heating element shorter, under the premise that the heating area of the heating element remains unchanged, the projection area of the heating component along the height direction of the box can be increased by increasing the area of the flow section of the heating element, the heating area of the heating element can remain unchanged, increasing the area of the flow section can improve the strength of the heating element, so as to reduce the probability that the heating element is damaged by foreign matter in the box cutting the flow section of the heating element, thereby improving the poor reliability of the heating element.

[0087] Please refer to Figure 1 The battery monomer 21 generally includes an electrode assembly 212. The electrode assembly 212 includes a positive electrode, a negative electrode, and a separator disposed between the negative electrode and the positive electrode. During the charging and discharging process of the battery monomer 21, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time, the active ions can pass through.

[0088] 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 arranged on at least one surface of the positive electrode current collector.

[0089] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction of itself, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0090] As an example, the positive electrode current collector can adopt a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metal, alloy, surface-treated metal can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, etc. 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.).

[0091] 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. 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.

[0092] 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.

[0093] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0094] 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, nickel, titanium, or silver, and the like can be employed. The composite current collector can include a high molecular 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, and the like) on a high molecular material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, and the like).

[0095] 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.

[0096] 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.

[0097] As an example, the negative electrode active material can employ a negative electrode active material for a battery cell 21 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, lithium titanate, and the like. 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 21 can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0098] 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, and the like. 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 can be provided with a negative electrode active material.

[0099] As an example, the negative electrode active material can be filled or / and deposited in the negative electrode current collector.

[0100] 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.

[0101] In some embodiments, the separator is a separator film. The present application does not have a particular limitation on the type of the separator film, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0102] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0103] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0104] In some embodiments, the battery cell 21 also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel-like, or solid.

[0105] Liquid electrolytes include electrolyte salts and solvents.

[0106] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0107] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may 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 ethers.

[0108] In some embodiments, the electrolyte can also optionally include an additive. For example, the additive can include a negative electrode film-forming additive, a positive electrode film-forming additive, and an additive capable of improving certain performance of the battery cell 21, such as an additive capable of improving overcharge / fast charge performance of the battery cell 21, an additive capable of improving high-temperature performance of the battery cell 21, an additive capable of improving low-temperature performance of the battery cell 21, and the like.

[0109] The gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0110] The solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0111] As an example, the polymer of the polymer solid electrolyte can include a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid, cellulose, or the like.

[0112] As an example, the inorganic solid electrolyte can be 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.

[0113] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0114] In some embodiments, the electrode assembly 212 has a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound to form the jelly-roll structure.

[0115] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets can be alternately stacked.

[0116] In some embodiments, the electrode assembly 212 can have a cylindrical shape, a flat shape, or a polygonal shape, or the like.

[0117] In some embodiments, the electrode assembly 212 can be provided with a tab. The tab can guide current out of the electrode assembly 212. The tab can include a positive tab and a negative tab.

[0118] In some embodiments, the battery cell 21 can include a housing 211, as described with reference to Figure 1 The housing 211 can be a steel case, an aluminum case, a plastic case (e.g., polypropylene), a composite metal case (e.g., a copper-aluminum composite case), an aluminum-plastic film, or the like.

[0119] In some embodiments, the housing 211 can be a sealed structure or a non-sealed structure. As an example, when the housing 211 is a non-sealed structure, the housing 211 serves to protect the electrode assembly 212, and a sealing bag is further included between the housing 211 and the electrode assembly 212, which serves to encapsulate the electrode assembly 212 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum plastic film. When the housing 211 is a sealed structure, it is used to encapsulate the electrode assembly 212 and the electrolyte, etc.

[0120] As an example, the battery cell 21 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, etc., without specific limitation in the present application.

[0121] In some embodiments, referring to Figure 1 , the housing 211 includes an end cover 2111 and a housing 2112, and the housing 2112 is provided with an opening, and the end cover 2111 is provided on the opening. The housing 2112 can be provided with one or more openings. The end cover 2111 can also be provided with one or more openings.

[0122] In some embodiments, referring to Figure 1 , the housing 211 is provided with at least one electrode terminal 21111, and the electrode terminal 21111 is electrically connected with the tab. The electrode terminal 21111 can be directly connected with the tab, or indirectly connected with the tab through the current collecting member 214. The electrode terminal 21111 can be provided on the end cover 2111, or provided on the housing 2112.

[0123] In some embodiments, referring to Figure 1 , the housing 211 is provided with a pressure relief mechanism 213. The pressure relief mechanism 213 is used to discharge the internal gas of the battery cell 21.

[0124] As an example, the pressure relief mechanism 213 is actuated to release the internal pressure or temperature of the battery cell 21 when the internal pressure or temperature of the battery cell 21 reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 21 reaches the predetermined threshold, the pressure relief mechanism 213 performs an action or a weak structure provided in the pressure relief mechanism 213 is broken, thereby forming an opening or a passage for the internal pressure or temperature to be released. The threshold value is designed differently according to different design requirements. The threshold value can depend on the material of one or more of the positive plate, the negative plate, the electrolyte, and the separator in the battery cell 21.

[0125] As an example, the pressure relief mechanism 213 can be integrally formed with the housing 211.

[0126] As an example, the pressure relief mechanism 213 can also be provided separately from the housing 211 and connected with the housing 211.

[0127] As used herein, "actuation" of the pressure relief mechanism 213 refers to the pressure relief mechanism 213 being activated or brought to a state in which the internal pressure and temperature of the battery cell 21 can be released. The actuation of the pressure relief mechanism 213 can include, but is not limited to, movement of components in the pressure relief mechanism 213 to form a venting path, at least a portion of the pressure relief mechanism 213 rupturing, breaking, tearing, or opening, etc. Upon actuation of the pressure relief mechanism 213, the high temperature and pressure material inside the battery cell 21 can be expelled as a discharge from the actuated portion. In this manner, the battery cell 21 can be depressurized and cooled at a controlled pressure or temperature, thereby reducing the potential for a more severe accident.

[0128] In some embodiments, the housing 211 is not a sealed structure, and the pressure relief mechanism 213 can be configured as a through hole for venting the gas inside the battery cell 21.

[0129] As used herein, the discharge from the battery cell 21 can include, but is not limited to, electrolyte, dissolved or broken positive and negative electrode sheets, fragments of separators, high temperature and pressure gases generated by reactions, flames, etc.

[0130] Please refer to Figure 2 The battery apparatus 100 as used herein can include one or more battery cell assemblies 20 for providing voltage and capacity. The battery cell assembly 20 can include a plurality of battery cells 21 connected in series, in parallel, or in a mixed connection through busbar components.

[0131] In some embodiments, the battery cell assembly 20 is generally formed by an arrangement of a plurality of battery cells 21.

[0132] As an example, the battery cell assembly 20 can be a battery module formed by an arrangement and fixation of a plurality of battery cells 21 into a single independent module. As an example, the battery module can be formed by bundling a plurality of battery cells 21 with a cable tie.

[0133] In some embodiments, the battery apparatus 100 can be a battery pack including a case 10 and one or more battery cell assemblies 20 housed in the case 10.

[0134] As an example, the battery cell assembly 20 can be a battery module, and the battery cell assembly 20 can be housed in the case 10 by fixing the battery module in the case 10.

[0135] As an example, the battery cell assembly 20 can also be accommodated in the case 10 by directly fixing a plurality of battery cells 21 to the case 10.

[0136] As an example, please refer to Figure 2 The case 10 can include a first case 11 and a second case 12. The first case 11 and the second case 12 are buckled so that a closed space is formed inside the case 10 to accommodate the battery cell assembly 20. Here, closed means covered or closed, which can be sealed or unsealed. The first case 11 can be a top cover or a bottom plate.

[0137] 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 connected with the frame respectively, so that a closed space is formed inside the case 10 to accommodate the battery cell assembly 20.

[0138] In some embodiments, please refer to Figure 3 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.

[0139] The technical solutions described in the embodiments of the application are applicable to various electric devices using battery cells 21, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles 1000, ships and spacecraft, such as spacecraft including airplanes, rockets, space shuttles and spacecraft.

[0140] The following embodiments are for convenience of illustration, please refer to Figure 2 , Figures 4-6 A battery device 100 according to some embodiments of the application is taken as an example for illustration.

[0141] The battery device 100 includes a case 10, a battery cell assembly 20 and a heating component 30. The case 10 has an accommodation space 112 inside. The battery cell assembly 20 is located in the accommodation space 112, and the battery cell assembly 20 includes a plurality of rows of battery cells 21, the arrangement direction of the plurality of battery cells 21 intersects with the height direction Z of the case 10. The heating component 30 is located in the accommodation space, and the heating component 30 includes a heating element 31, the heating element 31 is arranged to heat and heat the battery cells 21 in an energized state, and the heating element 31 includes a straight heating section 311, the straight heating section 311 extends along the arrangement direction of the plurality of battery cells 21, and the straight heating section 311 is used to heat the plurality of battery cells 21.

[0142] The number of straight heating sections 311 can be one or more. When the number of straight heating sections 311 is more than one, the plurality of straight heating sections 311 can be connected in series or in parallel.

[0143] The heating element 31 refers to a component that generates heat by using the electrical resistance of a material under the action of electricity.

[0144] Optionally, the heating element 31 is a metal wire or a metal sheet.

[0145] The heating element 31 can be arranged on the top, bottom or side of the battery monomer assembly 20, and specifically, the heating element 31 can be arranged on the side wall, top wall or bottom wall of the box body 10.

[0146] The straight heating section 311 refers to a portion of the heating element 31 that does not bend.

[0147] The straight heating section 311 can extend along the arrangement direction of the plurality of battery monomers 21, and the straight heating section 311 can have a long strip structure.

[0148] The straight heating section 311 is used to heat the plurality of battery monomers 21, can reduce the bending of the heating element 31, can make the length of the heating element 31 shorter, can increase the projection area of the heating component 30 along the height direction Z of the box body 10 by increasing the area of the flow cross section of the heating element 31 under the premise that the heating area of the heating element 31 remains unchanged, can keep the heating area of the heating element 31 unchanged, and increasing the area of the flow cross section can improve the strength of the heating element 31, so as to reduce the probability that the flow cross section of the heating element 31 is cut by foreign matter in the box body and the heating element 31 is damaged, thereby improving the poor reliability of the heating element 31. The flow cross section is perpendicular to the length direction of the heating element 31. When the heating element 31 only has the straight heating section 311, the flow cross section of the heating element 31 is perpendicular to the length of the heating element 31. When the heating element 31 has the straight heating section 311 and the bending section 312, the flow cross section of the heating element 31 is perpendicular to the length direction of the heating element 31 in the unfolded flat state. Optionally, one straight heating section 31 is arranged on the side of a plurality of battery monomers 21.

[0149] In some embodiments, referring to Figure 6 , the number of straight heating sections 311 is a plurality, the heating element 31 further includes a bending section 312, and among the plurality of straight heating sections 311, two straight heating sections 311 arranged adjacently are connected in series through the bending section 312.

[0150] The bending section 312 refers to a portion of the heating element 31 that bends.

[0151] The bending angle between the two adjacent straight heating sections 311 can be less than or equal to 180° and greater than 0°.

[0152] The two adjacent straight heating sections 311 are connected in series through the bending section 312, the length of the heating element 31 can be increased, the resistance of the heating element 31 can be increased, the resistance of the heating element 31 can be changed according to the actual heating demand, and the plurality of battery monomers 21 can be heated by the plurality of straight heating sections 311, and the heating area of the heating element 31 can be increased.

[0153] In some embodiments, the plurality of straight heating sections 311 are arranged in rows, and the arrangement direction of the plurality of straight heating sections 311 intersects the arrangement direction of the plurality of battery monomers 21.

[0154] The arrangement direction of the plurality of straight heating sections 311 can intersect the arrangement direction of the plurality of battery monomers 21, and can intersect or be the same as the height direction Z of the box body 10. When the heating component 30 is arranged on the inner side of the side wall of the box body 10, the arrangement direction of the plurality of straight heating sections 311 can be arranged to be the same as the height direction of the box body 10, and when the heating component 30 is arranged on the bottom wall of the box body 10, the arrangement direction of the plurality of straight heating sections 311 can be arranged to intersect the height direction Z of the box body 10.

[0155] Therefore, the heating component 30 can be compact to reduce the space occupied by the heating component 30 and improve the space utilization of the box body 10. In addition, each straight heating section 311 can heat a plurality of battery monomers 21 to reduce the bending of the heating element 31. Under the condition that the heating area of the heating element 31 is unchanged, the area of the flow cross section of the heating element 31 can be made larger to reduce the probability that the flow cross section of the heating element 31 is damaged by foreign matter in the box body 10, thereby improving the poor reliability of the heating element 31.

[0156] In some embodiments, please refer to Figure 5 and Figure 6 At least one of the bending section 312 and the straight heating section 311 is a flat structure, and the thickness direction of the flat structure is the same as the thickness direction of the side wall of the box body 10.

[0157] Therefore, the heating component 30 can be made thinner to reduce the space occupied by the heating component 30 in the box body 10 and improve the space utilization of the box body 10. In addition, at least one of the bending section 312 and the straight heating section 311 can be made wider to make the heating element 31 have a certain strength to reduce the probability that the heating element 31 is damaged by foreign matter in the box body 10, thereby improving the poor reliability of the heating element 31.

[0158] In some embodiments, please refer to Figure 6 The number of bending sections 312 is N, N is an integer, and the value range of N is 2-40.

[0159] When the resistance value and resistivity of the heating element 31 remain unchanged, as N increases, the heating element 31 can be wound longer. In order to keep the resistance value unchanged, the area of the flow cross section of the heating element 31 needs to be increased. At this time, the material usage of the heating element 31 is increased, the number of bends of the heating element 31 is increased, the manufacturing process is more complex, and the manufacturing cost of the heating element 31 is increased. In order to balance the structural strength of the heating element 31 and the manufacturing cost of the heating element 31, the value range of N is set to 2-40.

[0160] In some embodiments, referring to Figure 6 , the value range of N is 2-8.

[0161] In this way, the number of bending sections 312 can be reduced to reduce the length of the winding of the heating element 31. Under the premise that the resistance value of the heating element 31 remains unchanged, the resistance value of the heating element 31 can be kept unchanged by increasing the cross-sectional area, so as to improve the structural strength of the heating element 31.

[0162] In some embodiments, referring to Figure 2 and Figure 4 , at least part of the side wall of the box body 10 is connected with the heating component 30.

[0163] As an example, the first box body 11 of the box body 10 is located below the second box body 12. The first box body 11 has a side wall, and the heating component 30 is connected with the side wall of the first box body 11. The first box body 11 can also be a chassis structure, and the second box body 12 has a side wall, and the heating component 30 is connected with the side wall of the second box body.

[0164] The connection of the heating component 30 and the side wall of the box body 10 includes but is not limited to bonding, screw connection or clamping and the like. For example, the heating component 30 further includes a connecting plate, and the first protective layer 321 away from the heating element 31 is connected with the connecting plate. The connecting plate is connected with the side wall of the box body 10 through screws or other fasteners, and the connecting plate can also be clamped with the side wall of the box body 10.

[0165] When the external environment is low temperature, the external environment exchanges heat with the battery monomer assembly 20 through the side wall of the box body 10. The part of the battery monomer assembly 20 adjacent to the side wall of the box body 10 is greatly affected, which easily causes the performance of the battery monomer assembly 20 to decrease. The side wall is provided with the heating component 30, which can reduce the influence of the part of the battery monomer assembly 20 adjacent to the side wall, so as to reduce the influence of low temperature on the performance of the battery monomer assembly 20.

[0166] In some embodiments, the size of the side wall connected with the heating component 30 along the height direction Z of the box body 10 is H1, the size of the flow cross section of the heating element 31 along the height direction Z of the box body 10 is H2, and 5mm≤H2≤90%*H1.

[0167] In the premise of not changing the size of the heating element 31 along the thickness direction of the side wall, when H2 is 5 mm, the heating element 31 can have a certain strength to reduce the probability of damage of the heating element 31 by metal foreign matter in the box 10. As H2 increases, the strength of the heating element 31 also increases, and the size of the heating element 31 along the height direction Z of the box 10 also increases. When H2 is greater than 90%*H1, it is easy to make the heating component 30 exceed one end of the side wall of the box 10, which is easy to interfere in the assembly process and is not conducive to assembly. Therefore, the value range of H2 is set to 5 mm-90%*H1.

[0168] In some embodiments, 5 mm≤H2≤80%*H1. In the premise of not changing the size of the heating element 31 along the thickness direction of the side wall, the heating element 31 can have a certain strength to reduce the probability of damage of the heating element 31 by metal foreign matter in the box 10. At the same time, the probability of the heating element 31 exceeding one end of the side wall of the box 10 can be reduced to facilitate assembly.

[0169] In some embodiments, the box 10 has a structural beam 111, the number of the structural beam 111 is one, the structural beam 111 and the side wall of the box 10 enclose a containing space 112, and the structural beam 111 is connected with the heating component 30.

[0170] When the external environment is low temperature, the side wall of the box 10 will transmit cold to the battery monomer assembly 20 through the structural beam 111. By arranging the heating component 30 on the structural beam 111 and heating the battery monomer assembly 20 by the heating component 30, the influence of the structural beam 111 on the temperature of the battery monomer assembly 20 can be reduced.

[0171] In some embodiments, please refer to Figure 2 , the box 10 has a structural beam 111, the number of the structural beam 111 is multiple, the multiple structural beams 111 are arranged at intervals along the first direction X, the multiple structural beams 111 and the side wall of the box 10 enclose multiple containing spaces arranged along the first direction X, each containing space is provided with the battery monomer assembly 20, and at least one structural beam 111 at the outermost side along the first direction X in the multiple structural beams 111 is connected with the heating component 30. The first direction X intersects with the height direction Z of the box 10, and the first direction X is the same as or intersects with the arrangement direction of the multiple battery monomers 21.

[0172] As an example, the outermost structural beam 111 of the plurality of structural beams 111 is provided with a heating component 30 towards one side of the battery cell assembly 20. The connection between the heating component 30 and the structural beam 111 includes, but is not limited to, bonding, screw connection or clamping, etc. For example, the heating component 30 further includes a connecting plate, the first protective layer 321 is connected with the connecting plate away from the heating element 31, and the connecting plate is connected with the structural beam 111 through screws or other fasteners. The connecting plate can also be clamped with the structural beam 111, such as providing a clamping groove on the structural beam 111 and arranging the connecting plate in the clamping groove.

[0173] When the external environment is low temperature, the side wall of the box body 10 will transmit cold to the battery cell assembly 20 through its adjacent structural beam 111. By arranging the heating component 30 adjacent to the side wall of the box body 10, the battery cell assembly 20 can be heated by the heating component 30, thereby reducing the influence of the structural beam 111 on the temperature of the battery cell assembly 20.

[0174] In some embodiments, the resistivity of the heating element is P, and P is in the range of 2Ωmm 2 / m-50Ωmm 2 / m.

[0175] The heating element 31 can be a straight resistance wire or a resistance sheet, or a resistance wire or a resistance sheet with a bend.

[0176] The heating element 31 can be a metal conductor, or a non-metallic conductor such as graphite.

[0177] The resistivity of the heating element 31 is set to be in the range of 2Ωmm 2 / m-50Ωmm 2 / m, so as to reduce the influence of increasing the area of the flow cross section on the resistance value of the heating element 31, and enable the heating element 31 to heat the battery cell 21 within a preset resistance value, thereby improving the heating effect of the heating component 30 on the battery cell 21.

[0178] In some embodiments, 5Ωmm 2 / m≤p≤15Ωmm 2 / m.

[0179] When P = 5Ωmm 2 / m, the area of the flow cross section of the heating element 31 can be made larger under the condition that the resistance value of the heating element 31 and the length of the heating element remain unchanged, so as to meet the requirement of the cutting resistance of the heating element 31. With the increase of P, the area of the flow cross section of the heating element 31 can be made larger, but the manufacturing cost of the heating element 31 also increases. In order to balance the manufacturing cost of the heating element 31 and improve the cutting resistance of the heating element 31, the value range of P is set to be in the range of 5Ωmm 2 / m-15Ωmm 2 / m.

[0180] In some embodiments, the heating element 31 comprises any one of an iron-aluminum alloy element, a nickel-aluminum alloy element and a nickel-chromium alloy element.

[0181] The iron-aluminum alloy element can be an alloy element only containing iron and aluminum, or an alloy element containing other metals in addition to iron and aluminum. The iron-aluminum alloy element comprises, but is not limited to, any one of an iron-chromium-aluminum alloy element, an iron-nickel-aluminum alloy element and a gold-palladium-iron-aluminum alloy element.

[0182] The nickel-aluminum alloy element can be an alloy element only containing nickel and aluminum, or an alloy element containing other metals in addition to nickel and aluminum. The nickel-aluminum alloy element comprises, but is not limited to, any one of a nickel-chromium-aluminum alloy element and a nickel-molybdenum-aluminum alloy element.

[0183] The nickel-chromium alloy element can be an alloy element only containing nickel and chromium, or an alloy element containing other metals in addition to nickel and chromium. For example, the nickel-chromium alloy element comprises, but is not limited to, any one of a nickel-chromium-aluminum alloy element, a gold-nickel-chromium alloy element and an iron-nickel-chromium-molybdenum-copper alloy element.

[0184] After increasing the area of the overcurrent section of the heating element 31 and reducing the length of the heating element 31, the heating element 31 can reach a preset resistance value by using a high-resistivity material, so that the heating element 31 can heat the battery monomer 21 within a preset temperature range.

[0185] In some embodiments, referring to Figure 5 The heating component 30 further comprises a protective layer 32, the heating element 31 is provided with the protective layer 32 on two opposite sides thereof, the protective layers 32 on the two opposite sides of the heating element 31 are connected to each other, the protective layer 32 is in thermal conduction connection with the heating element 31, and the protective layer 32 is in electrical insulation with the heating element 31.

[0186] The protective layers 32 on the two opposite sides of the heating element 31 can be connected by hot melting welding or bonding.

[0187] The protective layer 32 can be single-layer or multi-layer, and the materials of the multi-layer protective layer 32 can be the same or different.

[0188] The protective layer 32 can protect the heating element 31, so as to reduce the probability of the heating element 31 being cut, thereby improving the reliability of the working of the heating element 31.

[0189] In some embodiments, referring to Figure 5, the protective layer 32 on the first side of the heating element 31 along the thickness direction of the protective layer 32 is a first protective layer 321, and the first protective layer 321 comprises an insulating film layer 3211 and a reinforcing layer 3212. The insulating film layer 3211 is bonded to the heating element 31. The reinforcing layer 3212 is located on the side of the insulating film layer 3211 away from the heating element 31.

[0190] The insulating film layer 3211 and the heating element 31 can be attached to the surface of the insulating film 3211 by bonding to preliminarily fix the heating element 31.

[0191] The insulating film layer 3211 includes but is not limited to any one of a polyimide film layer, a polyvinyl fluoride film layer, a polyamide film layer, a polyphenyl ether film layer, a silicon oxide layer, a silicon nitride layer, or an aluminum nitride layer.

[0192] The reinforcing layer 3212 includes but is not limited to a silicone layer, a polyimide insulating film, an epoxy resin layer, a Teflon layer, a polypropylene layer, a phenolic resin layer, or a film layer composed of polyimide and montmorillonite nanocomposites.

[0193] As an example, the protective layer 32 on the second side of the heating element 31 along the thickness direction of the protective layer 32 is a second protective layer 322, and the second protective layer 322 is at least one layer. The second protective layer 322 can be a single layer or multiple layers. As an example, the second protective layer 322 has one layer, and the second protective layer 322 includes but is not limited to any one of a silicone layer, a polyimide insulating film, an epoxy resin layer, a Teflon layer, a polypropylene layer, a phenolic resin layer, or a film layer composed of polyimide and montmorillonite nanocomposites. As an example, the second protective layer 322 has two layers, and the second protective layer 322 comprises an insulating layer and an outer protective layer. The side of the insulating layer away from the heating element 31 is provided with the outer protective layer, and the insulating layer includes but is not limited to any one of a polyimide film layer, a polyvinyl fluoride film layer, a polyamide film layer, a polyphenyl ether film layer, a silicon oxide layer, a silicon nitride layer, or an aluminum nitride layer. The outer protective layer includes but is not limited to any one of a silicone layer, a polyimide insulating film, an epoxy resin layer, a Teflon layer, a polypropylene layer, a phenolic resin layer, or a film layer composed of polyimide and montmorillonite nanocomposites.

[0194] When the heating component 30 is in contact with the box body 10, the insulating layer plays a role of insulating protection for the heating element 31, and the reinforcing layer 3212 and the insulating film layer 3211 play a role of double protection for the heating element 31 to reduce the probability of the heating element 31 being cut, thereby providing the reliability of the working of the heating element 31.

[0195] In some embodiments, please refer to Figure 5The first protective layer 321 further comprises an adhesive layer 33, which is located on the side of the reinforcing layer 3212 away from the heating element 31, and is used to bond the reinforcing layer 3212 and the box body 10.

[0196] The adhesive layer 33 can be a double-sided adhesive layer, or can be formed by applying adhesive on one side of the reinforcing layer 3212.

[0197] In this way, the heating component 30 can be fixed to the box body 10 through the adhesive layer 33, so as to facilitate the installation of the heating component 30.

[0198] The following embodiments are described by taking a heating component 30 of some embodiments of the present application as an example for convenience of description.

[0199] The heating component 30 can include the heating component 30 in the battery device 100 of the above embodiments. Specifically, the heating component 30 includes a heating element 31 arranged to generate heat in a powered state, and the heating element 31 includes a plurality of straight heating segments 311 and a bending segment 312, and in the plurality of straight heating segments 311, two adjacent straight heating segments 311 are connected in series through the bending segment 312.

[0200] In some embodiments, the number of straight heating segments 311 is a plurality, and the heating element 31 further includes a bending segment 312, and in the plurality of straight heating segments 311, two adjacent straight heating segments 311 are connected in series through the bending segment 312.

[0201] The two adjacent straight heating segments 311 are connected in series through the bending segment 312, which can increase the length of the heating element 31, so as to increase the resistance of the heating element 31, so that the resistance of the heating element 31 can be changed according to the actual heating demand, and the plurality of straight heating segments 311 can heat a plurality of battery monomers 21 together, so as to increase the heating area of the heating element 31.

[0202] In some embodiments, please refer to Figure 6 At least one of the bending segment 312 and the straight heating segment 311 is a flat structure, and the thickness direction of the flat structure is the same as the thickness direction of the side wall of the box body 10.

[0203] In this way, the heating component 30 can be made thinner, so as to reduce the space occupied by the heating component 30 in the box body 10, and improve the space utilization of the box body 10. At the same time, at least one of the bending segment 312 and the straight heating segment 311 can be manufactured wider, so that the heating element 31 has a certain strength, so as to reduce the probability that the heating element 31 is damaged by being cut by foreign matter in the box body 10, thereby improving the poor reliability of the heating element 31.

[0204] In some embodiments, the resistivity of the heating element is P, and the value of P is in the range of 2Ωmm 2 / m≤p≤50Ωmm 2 / m.

[0205] The resistivity of the heating element is set to 2Ωmm 2 / m-50Ωmm 2 / m, so that the heating element has high resistivity, to reduce the influence of increasing the area of the overcurrent section on the resistance value of the heating element, so that the heating element can heat the battery monomer within the preset resistance value, to improve the heating effect of the heating component.

[0206] In some embodiments, the value range of P is 5Ωmm 2 / m≤p≤15Ωmm 2 / m.

[0207] The resistivity of the heating element 31 is set to 2Ωmm 2 / m-50Ωmm 2 / m, to reduce the influence of increasing the area of the overcurrent section on the resistance value of the heating element 31, so that the heating element 31 can heat the battery monomer 21 within the preset resistance value, to improve the heating effect of the heating component 30 on the battery monomer 21.

[0208] In some embodiments, the heating element 31 includes any one of an iron-aluminum alloy piece, a nickel-aluminum alloy piece, and a nickel-chromium alloy piece.

[0209] The iron-aluminum alloy piece can be an alloy piece only with iron and aluminum, or an alloy piece doped with other metals in addition to iron and aluminum. The iron-aluminum alloy piece includes but is not limited to any one of an iron-chromium-aluminum alloy piece, an iron-nickel-aluminum alloy piece, and a gold-palladium-iron-aluminum alloy piece.

[0210] The following embodiments are described for convenience with a power utilization device of some embodiments of the present application as an example.

[0211] The power utilization device includes the battery device 100 of the above embodiments, and the battery device 100 is used to provide power to the power utilization device.

[0212] The power utilization device can be but is not limited to the examples described in the above embodiments.

[0213] Since the power utilization device includes all the technical features of the above battery device 100, the effects are the same as described above, and will not be repeated here.

[0214] The following embodiments are described for convenience with reference to Figure 7 a kind of energy storage device 2000 of some embodiments of the present application as an example.

[0215] The energy storage device 2000 includes a cabinet 2100 and a battery cluster 2200. The battery cluster 2200 is accommodated in the cabinet 2100. The battery cluster 2200 includes a plurality of battery devices 100.

[0216] The battery cluster 2200 can increase the voltage and capacity of the energy storage device 2000. The battery cluster 2200 can include a plurality of battery devices 100. The plurality of battery devices 100 are connected in series by the busbar component to increase the voltage of the energy storage device 2000. When the energy storage device 2000 includes a plurality of battery clusters 2200, the plurality of battery clusters 2200 are connected in parallel to increase the capacity of the energy storage device 2000.

[0217] The energy storage device 2000 can be used in an energy storage power station, a wind power system, a solar power system, a mobile power system, or a temporary power supply system. The energy storage device 2000 can store electrical energy as needed and output the electrical energy at an appropriate time. For example, the energy storage device 2000 can store electrical energy during a low electricity usage period and provide electrical energy to relevant users or electrical equipment during a high electricity usage period. The energy storage system provided by the embodiments of the present application can be any power system that needs to use the energy storage device 2000.

[0218] In some embodiments, the energy storage device 2000 is an energy storage container or an energy storage cabinet.

[0219] Since the energy storage device 2000 includes all the technical features of the battery device 100 provided in the embodiments, the effects are the same as described above, and thus will not be described again.

[0220] In an optional embodiment of the battery device, please refer to Figure 2 , Figures 4-6The battery device 100 comprises a box body 10, a battery cell assembly 20 and a heating component 30. The box body 10 has an accommodation space 112 inside. The battery cell assembly 20 is located in the accommodation space 112, and the battery cell assembly 20 comprises a plurality of rows of battery cells 21, and the arrangement direction of the plurality of battery cells 21 intersects the height direction Z of the box body 10. The heating component 30 is located in the accommodation space, and the heating component 30 comprises a heating element 31 arranged to heat and heat the battery cells 21 in an energized state, and the heating element 31 comprises a straight heating section 311 extending along the arrangement direction of the plurality of battery cells 21, and the straight heating section 311 is used to heat the plurality of battery cells 21. The number of straight heating sections 311 is a plurality, and the heating element 31 further comprises a bending section 312, and in the plurality of straight heating sections 311, two adjacent straight heating sections 311 are connected in series through the bending section 312. The plurality of straight heating sections 311 are arranged in a row, and the arrangement direction of the plurality of straight heating sections 311 intersects the arrangement direction of the plurality of battery cells 21. At least part of the side wall of the box body 10 is connected with the heating component 30. The box body 10 has a plurality of structural beams 111, and the plurality of structural beams 111 are arranged at intervals along the first direction X, and the plurality of structural beams 111 and the side wall of the box body 10 enclose a plurality of accommodation spaces arranged along the first direction X, and each accommodation space is provided with the battery cell assembly 20, and at least one of the plurality of structural beams 111 on the outermost side along the first direction X is connected with the heating component 30, and the first direction X intersects the height direction Z of the box body 10, and the first direction X is the same as or intersects the arrangement direction of the plurality of battery cells 21. The resistivity of the heating element is P, 5Ωmm 2 / m≤p≤15Ωmm 2 / m. The heating component 30 further comprises a protective layer 32, and the heating element 31 is provided with the protective layer 32 on the two opposite sides respectively, the protective layers 32 on the two opposite sides of the heating element 31 are connected with each other, the protective layer 32 is in thermal connection with the heating element 31, and the protective layer 32 and the heating element 31 are arranged in electrical insulation. Along the thickness direction of the protective layer 32, the protective layer 32 on the first side of the heating element 31 is a first protective layer 321, and the first protective layer 321 comprises an insulating film layer 3211 and a reinforcing layer 3212. Among them, the insulating film layer 3211 is bonded with the heating element 31. The reinforcing layer 3212 is located on the side of the insulating film layer 3211 away from the heating element 31. The first protective layer 321 further comprises a bonding layer 33, and the bonding layer 33 is located on the side of the reinforcing layer 3212 away from the heating element 31, and the bonding layer 33 is used to bond the reinforcing layer 3212 and the box body 10.

[0221] The straight heating section 311 is used for heating the plurality of battery monomers 21, can reduce the bending of the heating element 31, make the length of the heating element 31 can be made shorter, under the premise of the heating area of the heating element 31 unchanged, can increase the projection area of the heating component 30 along the height direction Z of the box body 10 by increasing the area of the flow cross section of the heating element 31, can keep the heating area of the heating element 31 unchanged, increasing the area of the flow cross section can improve the strength of the heating element 31, to reduce the probability of the heating element 31 being damaged by the foreign matter in the box body cutting the flow cross section of the heating element 31. The resistivity is set to 5Ωmm 2 / m≤p≤15Ωmm 2 / m, the heating element 31 has high resistivity, which can reduce the influence of the increase of the flow cross section area on the resistance of the heating element 31, so that the heating element 31 can heat the battery monomer 21 within the predetermined resistance range; and the setting of the protective layer 32 can protect the heating element 31, so as to reduce the probability of the heating element 31 being damaged by the metal foreign matter piercing the heating element 31.

[0222] 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 to 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, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: A housing, the interior of which has a storage space; A battery cell assembly is located within the accommodating space. The battery cell assembly includes a plurality of arranged battery cells, and the arrangement direction of the plurality of battery cells intersects with the height direction of the housing. A heating element is located within the accommodating space. The heating element includes a heating element configured to generate heat and heat the battery cells when energized. The heating element includes a direct heating section that extends along the arrangement direction of the plurality of battery cells and is used to heat the plurality of battery cells.

2. The battery device according to claim 1, characterized in that, The number of direct heating sections is multiple, and the heating element also includes a bending section. Among the multiple direct heating sections, two adjacent direct heating sections are connected in series through the bending section.

3. The battery device according to claim 2, characterized in that, The plurality of direct heating sections are arranged in a row, and the arrangement direction of the plurality of direct heating sections intersects with the arrangement direction of the plurality of battery cells.

4. The battery device according to claim 2, characterized in that, At least one of the bent section and the direct heating section is a flat structure, and the thickness direction of the flat structure is the same as the thickness direction of the side wall of the box.

5. The battery device according to claim 2, characterized in that, The number of the bent segments is N, where N is an integer and the value of N ranges from 2 to 40.

6. The battery device according to claim 5, characterized in that, The value of N ranges from 2 to 8.

7. The battery device according to claim 1, characterized in that, The heating element is connected to at least a portion of the side walls of the enclosure.

8. The battery device according to claim 7, characterized in that, The dimension of the side wall connected to the heating element along the height direction of the box is H1, and the dimension of the flow cross section of the heating element along the height direction of the box is H2, where 5mm≤H2≤90%*H1.

9. The battery device according to claim 8, characterized in that, 5mm≤H2≤80%*H1.

10. The battery device according to claim 7, characterized in that, The box has a structural beam, and there is one structural beam. The structural beam and the side wall of the box enclose the receiving space, and the structural beam is connected to the heating component.

11. The battery device according to claim 7, characterized in that, The housing has structural beams, and there are multiple structural beams. The multiple structural beams are spaced apart along a first direction. The multiple structural beams and the side wall of the housing enclose multiple accommodating spaces arranged along the first direction. Each accommodating space is provided with a battery cell assembly. At least one of the outermost structural beams along the first direction is connected to the heating component. The first direction intersects with the height direction of the housing and is the same as or intersects with the arrangement direction of the multiple battery cells.

12. The battery device according to any one of claims 1-6, characterized in that, The heating element is disposed between the bottom wall of the housing and the battery cell assembly.

13. The battery device according to any one of claims 1-11, characterized in that, The resistivity of the heating element is P, and the value of P is in the range of 2Ωmm. 2 / m≤p≤50Ωmm 2 / m.

14. The battery device according to claim 13, characterized in that, 5Ωmm 2 / m≤p≤15Ωmm 2 / m。 15. The battery device according to claim 13, characterized in that, The heating element includes any one of iron-aluminum alloy, nickel-aluminum alloy, and nickel-chromium alloy.

16. The battery device according to any one of claims 1-11, characterized in that, The heating component further includes a protective layer, which is provided on both sides opposite to the heating element. The protective layers on both sides opposite to the heating element are connected to each other. The protective layer is thermally connected to the heating element and electrically insulated from the heating element.

17. The battery device according to claim 16, characterized in that, Along the thickness direction of the protective layer, the protective layer on the first side of the heating element is a first protective layer, which includes: An insulating film layer is bonded to the heating element; A reinforcing layer is located on the side of the insulating film layer opposite to the heating element.

18. The battery device according to claim 17, characterized in that, The first protective layer also includes: An adhesive layer is located on the side of the reinforcing layer opposite to the heating element, and the adhesive layer is used to bond the reinforcing layer and the housing.

19. A heating element, characterized in that, The heating component includes a heating element, which is configured to generate heat when energized. The heating element includes a direct heating section, which is a strip-shaped structure extending in a straight direction.

20. The heating component according to claim 19, characterized in that, The number of direct heating sections is multiple, and the heating element also includes a bending section. Among the multiple direct heating sections, two adjacent direct heating sections are connected in series through the bending section.

21. The heating component according to claim 20, characterized in that, At least one of the direct heating section and the bending section has a flat structure.

22. The heating component according to claim 19, characterized in that, The resistivity of the heating element is P, and the value of P is in the range of 2Ωmm. 2 / m≤p≤50Ωmm 2 / m.

23. The heating component according to claim 22, characterized in that, The value of P is in the range of 5Ωmm. 2 / m≤p≤15Ωmm 2 / m.

24. The heating component according to claim 22, characterized in that, The heating element includes any one of iron-aluminum alloy, nickel-aluminum alloy, and nickel-chromium alloy.

25. The heating element according to any one of claims 19-24, characterized in that, The heating component further includes a protective layer, which is provided on both sides opposite to the heating element. The protective layers on both sides opposite to the heating element are connected. The protective layer is thermally connected to the heating element and electrically insulated from the heating element.

26. An electrical appliance, characterized in that, Includes a battery device as described in any one of claims 1-18, the battery device being used to provide electrical energy to the electrical device.

27. An energy storage device, characterized in that, It includes a cabinet and a battery cluster, the battery cluster being housed within the cabinet, the battery cluster comprising a plurality of battery devices as described in any one of claims 1-18.

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