Battery device and power utilization device

Abstract

The utility model discloses a battery device and a power utilization device, and belongs to the technical field of batteries, and the battery device comprises a box body, a battery monomer assembly and a separator. The battery monomer assembly is positioned in the box body, the battery monomer assembly comprises at least two battery monomers, and the at least two battery monomers are sequentially arranged in a first direction; the separator is arranged between two adjacent battery monomers along the first direction, and the separator and the two corresponding adjacent battery monomers define an air duct. In battery monomers of the battery monomer assembly, at least two battery monomers are first battery monomers, at least one battery monomer is second battery monomer, and in the working process, heat released by the first battery monomer in unit time is greater than heat released by the second battery monomer in unit time; the separator is located between two adjacent first battery cells arranged in the first direction. The space utilization rate of the battery device can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Art

[0002] Batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in energy storage fields.

[0003] In the related art, the space utilization rate of the battery device is low. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a battery device and an electrical device to improve the space utilization of the battery device.

[0005] This application is implemented through the following technical solutions.

[0006] A first aspect of an embodiment of the present disclosure provides a battery device, including:

[0007] Box;

[0008] A battery cell assembly is located in the box, wherein the battery cell assembly includes at least two battery cells, and the direction in which the at least two battery cells are arranged in sequence is a first direction;

[0009] A separator is provided between two adjacent battery cells along the first direction, and the separator and the corresponding two adjacent battery cells form an air duct;

[0010] Among the battery cells of the battery cell assembly, at least two battery cells are first battery cells, and at least one battery cell is a second battery cell. During operation, the heat released by the first battery cell per unit time is greater than the heat released by the second battery cell per unit time, and the separator is located between two adjacent first battery cells arranged along the first direction.

[0011] In the disclosed embodiment, at least two battery cells are arranged in sequence, and a partition is provided between two adjacent battery cells arranged along a first direction. The partition and the corresponding two adjacent battery cells form an air duct, so that at least some of the battery cells in the battery cell assembly can serve as part of the air duct. The temperature-controlled airflow flowing through the air duct can directly contact the battery cells, thereby improving the efficiency of heat exchange between the battery cells and the temperature-controlled airflow in the air duct. The temperature-controlled airflow flowing through the air duct can cool or heat the battery cells as needed. At least some of the battery cells in the battery cell assembly serve as part of the air duct, so that the space in the air duct can avoid the expansion of the corresponding battery cells to a certain extent, thereby providing space for the battery cells to expand. The air duct of the disclosed embodiment can both allow the temperature-controlled airflow to flow to adjust the temperature of the corresponding battery cells and provide space for the battery cells to expand, thereby improving the space utilization of the battery device.

[0012] Since the first battery cells release a large amount of heat, placing a separator between two adjacent first battery cells arranged along the first direction can specifically cool the first battery cells with a large heat output, thereby effectively alleviating the situation where the local temperature of the battery device is high.

[0013] In some embodiments, the separator includes a separator sub-component, and the separator sub-components are arranged on opposite sides of the battery cell along the second direction. The second direction is arranged crosswise with the first direction, and the separator sub-components on both sides are arranged at intervals. The separator sub-components on both sides and the corresponding two adjacent battery cells are arranged to form the air duct.

[0014] In the disclosed embodiment, the partition sub-elements arranged on opposite sides along the second direction can prevent the temperature-regulating fluid in the air duct from escaping from between two adjacent battery cells along the second direction. The partition sub-elements on both sides guide the temperature-regulating fluid to flow as much as possible through various locations on the surfaces of the corresponding battery cells facing the air duct. By arranging the two partition sub-elements at intervals, an air duct located between the two partition sub-elements can be constructed in a relatively simple manner.

[0015] In some embodiments, among the partition sub-components on the opposite sides of the battery cell assembly along the second direction, the number of the partition sub-components on each side is at least two, and the box body also includes a connecting member, and the connecting member is provided on the opposite sides of the battery cell assembly along the second direction, and the connecting member on each side is respectively connected to at least two of the partition sub-components on the corresponding side.

[0016] In the embodiment of the present disclosure, at least two partition sub-elements on each side are connected together by the connecting members on the corresponding sides, which can better fix the positions of the partition sub-elements on each side along the first direction, thereby more firmly fixing the battery cells between two adjacent partition sub-elements on each side.

[0017] In some embodiments, the box further includes end stops, and the battery cell assembly is provided with end stops at both opposite ends along the first direction, and the end stops at each end are respectively connected to the connectors on both sides.

[0018] In the embodiment of the present disclosure, each end stop is respectively connected to the connecting members on both sides, and the relative positions of the end stops at both ends along the first direction can be fixed by the connecting members on both sides. The distance between the end stops at both ends along the first direction remains basically unchanged. When the battery cells in the battery cell assembly expand during operation, the end stops can generate a certain reaction force to act on the battery cell assembly to suppress the expansion of the battery cells in the battery cell assembly.

[0019] In some embodiments, the box body also includes a sealing member, which is arranged on opposite sides of the battery cell assembly. The arrangement directions of the sealing members on both sides are respectively arranged to cross the first direction and the second direction, and at least one side of the sealing member forms a ventilation interface connected to the air duct.

[0020] In the embodiment of the present disclosure, sealing members are provided on opposite sides of the battery cell assembly, and the battery cell assembly located between the sealing members on both sides is protected along the arrangement direction of the sealing members on both sides. The sealing members are connected to the air duct through the ventilation interface, so that the temperature regulating fluid can flow through the air duct through the ventilation interface to exchange heat and regulate temperature with the battery cell.

[0021] In some embodiments, ventilation interfaces communicating with the air duct are formed on both sides of the sealing members.

[0022] In the embodiment of the present disclosure, the airflow used to adjust the temperature of the battery cell assembly flows into the air duct from the ventilation interface of one side of the sealing member and flows out of the air duct from the ventilation interface of the other side of the sealing member, so that the temperature-adjusting airflow flows more smoothly in the air duct.

[0023] In some embodiments, the battery cell includes a shell, an electrode assembly located in the shell, and an electrode terminal installed on the shell, the electrode terminal is electrically connected to the electrode assembly, the electrode terminal is located on one side of the electrode assembly, and the arrangement direction of the electrode terminal and the electrode assembly is a third direction, and the third direction is arranged to cross the first direction and the second direction respectively.

[0024] In the embodiment of the present disclosure, the third direction is arranged to intersect with the first direction and the second direction, so that the position of the separator can avoid the position of the electrode terminal as much as possible, reducing the interference of the separator on the electrical connection between the electrode terminals of each battery cell.

[0025] In some embodiments, the separator contacts the corresponding two adjacent battery cells, the sum of the dimensions of all battery cells between the two adjacent separators along the first direction is a first dimension, the dimension of the separator along the first direction is a second dimension, and the ratio of the second dimension to the first dimension is 2% to 10%.

[0026] In the disclosed embodiments, the electrode assembly expands during the charge and discharge process. The ratio of the second dimension to the first dimension is within a relatively suitable range. The first dimension corresponding to all battery cells between two adjacent separators along the first direction has a relatively suitable second dimension. This provides a suitable air duct space, which improves the heat exchange effect of the temperature-regulated airflow passing through the air duct. The air duct also provides relatively suitable expansion space for the corresponding battery cells, reducing the expansion force exerted on the corresponding battery cells. The second dimension corresponding to the first dimension corresponding to all battery cells between two adjacent separators along the first direction has a relatively suitable second dimension, resulting in the battery device having relatively suitable mass energy density and dynamic performance.

[0027] In some embodiments, the first battery cell is a ternary lithium battery, and the second battery cell is a lithium iron phosphate battery.

[0028] In the embodiment of the present disclosure, the heat released per unit time by the ternary lithium battery is greater than that released by the lithium iron phosphate battery.

[0029] In some embodiments, the battery cell includes a shell, an electrode assembly located in the shell, and an electrode terminal installed on the shell, the electrode terminal is electrically connected to the electrode assembly, the electrode assembly includes a positive electrode, a negative electrode and an isolating member, the isolating member is arranged between the positive electrode and the negative electrode, the electrode assembly has a straight area, and the positive electrode and the negative electrode are stacked in the flat area along the first direction.

[0030] In the embodiment of the present disclosure, the area of ​​the projection area formed by projecting the electrode assembly in the direction of arrangement of the positive and negative electrodes in the straight area is relatively large, and the area of ​​the surface of the corresponding battery cell perpendicular to the direction of arrangement of the positive and negative electrodes in the straight area is relatively large. The heat released by the battery cell toward the side of the surface with a larger area is relatively large, and the positive and negative electrodes are stacked in the straight area along the first direction, so that the surface with a larger area of ​​the battery cell faces the air duct, which is conducive to the temperature-controlled airflow flowing through the air duct to better cool the surface with a larger area of ​​the battery cell.

[0031] An embodiment of the present disclosure provides an electrical device, comprising a battery device according to any one of the above embodiments, wherein the battery device is used to store or provide electrical energy.

[0032] In the battery device of the embodiment of the present disclosure, at least two battery cells are arranged in sequence, and a partition is provided between two adjacent battery cells arranged along a first direction. The partition and the corresponding two adjacent battery cells are used to form an air duct, so that at least some of the battery cells in the battery cell assembly can serve as part of the air duct. The temperature-controlled airflow flowing through the air duct can directly contact the battery cells, thereby improving the efficiency of heat exchange between the battery cells and the temperature-controlled airflow in the air duct. The temperature-controlled airflow flowing through the air duct can cool or heat the battery cells as needed. At least some of the battery cells in the battery cell assembly serve as part of the air duct, so that the space in the air duct can avoid the expansion of the corresponding battery cells to a certain extent, thereby providing space for the battery cells to expand. The air duct of the embodiment of the present disclosure can both allow the temperature-controlled airflow to flow to adjust the temperature of the corresponding battery cells and provide space for the battery cells to expand, thereby improving the space utilization of the battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to denote the same components. In the drawings:

[0034] Figure 1 Schematic diagram of the structure of the electric device according to an embodiment of the present disclosure;

[0035] Figure 2 Schematic diagram of the structure of the battery device according to an embodiment of the present disclosure, showing the outer box and the battery cell assembly, but not showing the separator, connector, end stop and sealing member;

[0036] Figure 3 Schematic diagram of the structure of the separator, connector and end stop according to the embodiment of the present disclosure;

[0037] Figure 4 This is an assembly diagram of a battery cell, a separator, a connector, and an end stopper according to an embodiment of the present disclosure. In the diagram, there are three battery cells between two adjacent separators.

[0038] Figure 5 for Figure 4 An enlarged view of position A in the middle;

[0039] Figure 6 An assembly diagram of a battery cell, a separator, a connector, an end stop, and a sealing member according to an embodiment of the present disclosure;

[0040] Figure 7 for Figure 6 Cross-sectional view of BB at mid-position;

[0041] Figure 8 This is an assembly diagram of a battery cell, a separator, a connector, and an end stopper according to an embodiment of the present disclosure. In the diagram, there are four battery cells between two adjacent separators.

[0042] Figure 9 This is a schematic structural diagram of a battery cell according to an embodiment of the present disclosure;

[0043] Figure 10 Schematic diagram of the structure of a wound electrode assembly according to an embodiment of the present disclosure;

[0044] Figure 11 Schematic diagram of the structure of the laminated electrode assembly according to an embodiment of the present disclosure.

[0045] Description of Reference Numerals

[0046] 100. Battery device; 400. Box; 403. Outer box; 401. First box; 402. Second box; 404. Connector; 405. End stopper; 406. Sealing member; 416. Ventilation interface; 1. Battery cell assembly; 12. First battery cell; 13. Second battery cell; 14. Outer casing; 15. Electrode assembly; 151. Positive electrode; 152. Negative electrode; 153. Isolator; 154. Flat area; 155. Corner area; 16. Electrode terminal; 2. Separator; 21. Separator; 3. Air duct; 1000. Vehicle; 200. Controller; 300. Motor; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0047] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" in the embodiments of the present disclosure and any variations thereof are intended to cover non-exclusive inclusions.

[0049] In the description of the embodiments of the present disclosure, technical terms such as "first," "second," and "third" are used solely to distinguish different objects and should not be understood to indicate or imply relative importance or to implicitly specify the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present disclosure, "plurality" means more than two, unless otherwise specifically defined.

[0050] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0051] In the description of the embodiments of the present disclosure, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0052] In the description of the embodiments of the present disclosure, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal connectivity between two components or interaction between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present disclosure based on specific circumstances.

[0053] In the description of the embodiments of the present disclosure, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0054] In related art, the battery cell assembly of a battery device is located within a housing. Temperature-controlled airflow is delivered into the housing to regulate the temperature of the battery cells within the battery cell assembly. A separate air duct within the housing through which the temperature-controlled airflow flows is provided. The temperature-controlled airflow flows within the duct, exchanging heat with the battery cells. Heat released by the battery cells is transferred through the sidewalls of the duct to the temperature-controlled airflow within the duct and carried away by the heat-controlled airflow. The temperature-controlled airflow within the duct does not come into contact with the battery cells, nor does it provide space for expansion.

[0055] The embodiment of the present disclosure forms an air duct through a separator and two corresponding adjacent battery cells. The battery cells themselves constitute a part of the air duct. The temperature-regulated airflow in the air duct can directly contact the battery cells. The space in the air duct can avoid the expansion of the battery cells to a certain extent, thereby providing space for the battery cells to expand.

[0056] The air duct formed by the separator and the battery cells according to the embodiment of the present disclosure can be applied to a battery device or an electrical device.

[0057] The present disclosure provides an electrical device. Figure 1 , including a battery device, the battery device is used to store or provide electrical energy.

[0058] In some embodiments, the power-consuming device further includes a device body, and the battery device is installed in the device body to supply power to the device body.

[0059] An electrical device is a device that uses electricity as an energy source and consumes it to achieve its corresponding function. For example, an electrical device may include, but is not limited to, a mobile phone, tablet computer, laptop computer, electric toy, power tool, battery-powered vehicle, electric vehicle, ship, spacecraft, etc. Electric toys may include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0060] The "device body" refers to the main structure that consumes electrical energy to perform its corresponding functions. For example, a power-consuming device could be a mobile phone, where the "device body" is the portion that performs functions such as communication, and power is supplied to this portion via a battery cell or battery device. For example, a power-consuming device could be a car, where the "device body" is the portion that provides passengers with a seat and allows them to travel on the road, and power is supplied to this portion via a battery cell or battery device.

[0061] The electrical device in some embodiments of the present application is taken as an example of a vehicle 1000 .

[0062] The vehicle 1000 provided in some embodiments of the present application may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1 The vehicle 1000 is provided with a battery device 100. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300. The controller 200 can be used to control the battery device 100 to power the motor 300. For example, the battery device 100 can be used to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0063] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0064] In some embodiments, the battery device 100 may be a battery pack.

[0065] In some embodiments, the battery device 100 may be an energy storage device.

[0066] The battery device 100 of the embodiment of the present application includes a battery cell assembly, which includes battery cells. The battery cells are used to store or provide electrical energy.

[0067] The number of battery cell assemblies corresponding to the battery device 100 is one or at least two, and the battery cell assembly is used to provide voltage and capacity. The battery cell assembly may include at least two battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0068] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0069] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing multiple battery cells to form an independent module. As an example, the battery module may be formed by bundling multiple battery cells with a cable tie.

[0070] In the embodiment of the present disclosure, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0071] The battery cells may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present disclosure.

[0072] A battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charge and discharge process of the battery cell, active ions (e.g., lithium ions) are intercalated and released between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through. 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.

[0073] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0074] As examples, the positive electrode current collector can be made of metal foil, conductive polymer material, carbon material, or composite current collector. For example, the metal foil can be made of pure metals, alloys, or surface-treated metals, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. A composite current collector can include a polymer base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys) onto a polymer substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0075] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.8 Co 0.15 Al 0.05O2) and at least one of its modified compounds. Modified compounds refer to substances obtained by modifying the above substances through methods such as doping or coating.

[0076] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0077] As examples, the negative electrode current collector can be made of metal foil, conductive polymer material, carbon material, or composite current collector. For example, the metal foil can be made of pure metal, alloy, or surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. A composite current collector can include a polymer base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy) on a polymer substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0078] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0079] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0080] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0081] In some embodiments, the negative electrode may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, or alloy foam. When the metal foam is used as the negative electrode sheet, the surface of the metal foam may or may not be provided with a negative electrode active material.

[0082] In some embodiments, the negative electrode may be made of carbon foam.

[0083] As an example, the negative electrode active material may be filled and / or deposited in the negative electrode current collector.

[0084] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0085] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0086] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0087] As an example, the primary 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 separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. The surface of the separator can also be coated with an inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating.

[0088] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0089] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and the electrolyte can be selected based on needs. The electrolyte can be liquid, gel, or solid.

[0090] The liquid electrolyte includes an electrolyte salt and a solvent.

[0091] 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 difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0092] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be an ether solvent. Ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0093] In some embodiments, the electrolyte may optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, or additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high temperature performance of the battery cell, and additives that improve the low temperature performance of the battery cell.

[0094] Among them, the gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0095] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0096] As an example, the polymer of the polymer solid electrolyte may include polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, a polyionic liquid, cellulose, and the like.

[0097] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0098] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0099] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of wound and laminated structures.

[0100] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0101] In some embodiments, the electrode assembly is a laminate structure.

[0102] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0103] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0104] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0105] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0106] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0107] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0108] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0109] In some embodiments, see Figure 2 The battery device 100 further includes a box body 400 , in which the battery cell assembly is installed.

[0110] As an example, see Figure 2 The housing 400 may include an outer box, which includes a first housing 401 and a second housing 402. The first housing 401 and the second housing 402 engage to form an enclosed space within the housing 400 for accommodating the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first housing 401 may be a top cover or a bottom plate.

[0111] The battery device 100 of the embodiment of the present disclosure is shown in FIG. Figures 3 to 8 The battery device 100 includes a housing 400, a battery cell assembly 1, and a separator 2. The battery cell assembly 1 is located within the housing 400 and includes at least two battery cells, which are arranged in a first direction X. The separator 2 is disposed between two adjacent battery cells along the first direction X. The separator 2 and the corresponding two adjacent battery cells enclose an air duct 3.

[0112] The box body 400 is a structure for accommodating the battery cell assembly 1 , and the box body 400 can protect the battery cell assembly 1 accommodated in the box body 400 .

[0113] The battery cell assembly 1 is generally formed by arranging a plurality of battery cells, and the plurality of battery cells can be connected in series, in parallel or in a mixed manner.

[0114] The separator 2 is used to separate two adjacent battery cells by a certain distance.

[0115] Exemplarily, the material of the separator 2 may be an insulating material.

[0116] Exemplarily, the material of the separator 2 may be plastic.

[0117] For example, the separator 2 may be made of metal.

[0118] For example, a separator 2 is provided between two adjacent battery cells along the first direction X. Alternatively, a separator 2 may be provided between every two adjacent battery cells along the first direction X.

[0119] For example, a separator 2 is provided between two battery cells adjacent to each other along the first direction X. Alternatively, a separator 2 may be provided between two battery cells partially adjacent to each other along the first direction X, while no separator 2 may be provided between two battery cells partially adjacent to each other along the first direction X. For example, two battery cells partially adjacent to each other along the first direction X may be in contact with each other.

[0120] In the disclosed embodiment, at least two battery cells are arranged in sequence, and a separator 2 is provided between two adjacent battery cells arranged along a first direction X. The separator 2 and the corresponding two adjacent battery cells enclose an air duct 3, so that at least some of the battery cells in the battery cell assembly 1 can serve as part of the air duct 3. The temperature-controlled airflow flowing through the air duct 3 can directly contact the battery cells, improving the efficiency of heat exchange between the battery cells and the temperature-controlled airflow within the air duct 3. The temperature-controlled airflow flowing through the air duct 3 can cool or heat the battery cells as needed. At least some of the battery cells in the battery cell assembly 1 serve as part of the air duct 3, so that the space in the air duct 3 can avoid the expansion of the corresponding battery cells to a certain extent, thereby providing space for the battery cells to expand. The air duct 3 in the disclosed embodiment can both allow the temperature-controlled airflow to flow to adjust the temperature of the corresponding battery cells and provide space for the battery cells to expand, thereby improving the space utilization of the battery device 100.

[0121] In some embodiments, see Figures 3 to 5 ,as well as Figure 7 and Figure 8 The separator 2 includes a separator sub-component 21, and a separator sub-component 21 is provided on both sides of the corresponding battery cell along the second direction Y. The second direction Y is arranged crosswise with the first direction X, and the separator sub-components 21 on both sides are arranged at intervals. The separator sub-components 21 on both sides and the corresponding two adjacent battery cells are arranged to form an air duct 3.

[0122] For example, the material of the partition member 21 may be an insulating material.

[0123] Exemplarily, the material of the partition member 21 may be plastic.

[0124] For example, the material of the partition member 21 may be metal.

[0125] Exemplarily, the partition member 21 is in the shape of a strip structure.

[0126] Exemplarily, the partition member 21 is in the shape of a cube.

[0127] The partition sub-components 21 on both sides are arranged at intervals, and the air duct 3 is located between the partition sub-components 21 on both sides.

[0128] Exemplarily, the number of the partitioning sub-elements 21 on each side along the second direction Y corresponding to each partitioning element 2 is one, and the number of the partitioning sub-elements 21 corresponding to each partitioning element 2 is two.

[0129] Exemplarily, the first direction X and the second direction Y are perpendicular.

[0130] Exemplarily, directions respectively crossing the first direction X and the second direction Y are preset directions.

[0131] Exemplarily, the dimension of the separator 21 along the preset direction is greater than or equal to the dimension of the battery cell along the preset direction.

[0132] Exemplarily, the preset directions are perpendicular to the first direction X and the second direction Y respectively.

[0133] Exemplarily, the preset directions are arranged along the up-down direction.

[0134] In the disclosed embodiment, the partition sub-elements 21 arranged on opposite sides along the second direction Y can prevent the temperature-regulating fluid in the air duct 3 from escaping from between two adjacent battery cells along the second direction Y. The partition sub-elements 21 on both sides guide the temperature-regulating fluid to flow as much as possible through various locations on the surfaces of the corresponding battery cells facing the air duct 3. By arranging the two partition sub-elements 21 at intervals, the air duct 3 located between the two partition sub-elements 21 can be constructed in a relatively simple manner.

[0135] It is understood that the specific structure of the divider 2 is not limited. For example, the divider 2 is integrally formed and has an air outlet connected to the air duct 3. The direction of the air duct 3 pointing to the air outlet is arranged to intersect with the first direction X and the second direction Y. For example, the divider 2 can be a rectangular frame.

[0136] In some embodiments, see Figures 3 to 5 ,as well as Figure 8Among the partition sub-components 21 on the opposite sides of the battery cell assembly 1 along the second direction Y, the number of the partition sub-components 21 on each side is at least two, and the box body 400 also includes a connecting member 404. The battery cell assembly 1 is provided with a connecting member 404 on both sides of the opposite sides along the second direction Y, and the connecting member 404 on each side is respectively connected to at least two partition sub-components 21 on the corresponding side.

[0137] Exemplarily, the number of battery cell assemblies 1 is at least one, each battery cell assembly 1 corresponds to at least two separators 2 arranged in sequence along the first direction X, each separator 2 includes two separator sub-elements 21 arranged opposite to each other along the second direction Y, and the number of separator sub-elements 21 on each side along the second direction Y is equal to the number of separators 2.

[0138] Exemplarily, the connecting member 404 is in the shape of a plate.

[0139] Exemplarily, the connecting member 404 is integrally formed with the partition sub-member 21 .

[0140] Exemplarily, the number of the battery cell assemblies 1 is at least two, and the at least two battery cell assemblies 1 are arranged along the second direction Y. The connector 404 between two adjacent battery cell assemblies 1 along the second direction Y is integrally formed.

[0141] In the embodiment of the present disclosure, at least two partition sub-elements 21 on each side are connected together by the connecting member 404 on the corresponding side, which can better fix the position of the partition sub-elements 21 on each side along the first direction X, thereby more firmly fixing the battery cells between the two adjacent partition sub-elements 21 on each side.

[0142] It is understood that the specific structure of the box body 400 is not limited. For example, the box body 400 may not be provided with the connector 404, and all the separator sub-components 21 on each side of the battery cell assembly 1 are disconnected, that is, the separator sub-components 21 are arranged at intervals and there is no additional connecting structure connecting the separator sub-components 21 on at least two sides.

[0143] In some embodiments, see Figures 3 to 5 ,as well as Figure 7 and Figure 8 The box body 400 further includes end blocks 405 , and end blocks 405 are provided at opposite ends of the battery cell assembly 1 along the first direction X, and each end block 405 is respectively connected to the connecting members 404 on both sides.

[0144] Exemplarily, the end stop 405 is in the shape of a plate.

[0145] Exemplarily, the end stop 405, the connecting member 404 and the partition sub-member 21 are integrally formed.

[0146] In the embodiment of the present disclosure, each end stopper 405 is respectively connected to the connecting members 404 on both sides, and the relative positions of the end stops 405 at both ends along the first direction X can be fixed by the connecting members 404 on both sides. The distance between the end stops 405 at both ends along the first direction X remains basically unchanged. When the battery cells in the battery cell assembly 1 expand during operation, the end stopper 405 can generate a certain reaction force to act on the battery cell assembly 1 to suppress the expansion of the battery cells in the battery cell assembly 1.

[0147] It is understood that the structure of the box body 400 is not limited. For example, the box body 400 may not be provided with the end stop 405, and the two connecting members 404 may be disconnected, that is, the connecting members 404 on both sides are arranged at intervals and there is no additional connecting structure connecting the connecting members 404 on both sides together.

[0148] In some embodiments, see Figure 6 and Figure 7 The box body 400 also includes a sealing member 406, and the sealing members 406 are provided on opposite sides of the battery cell assembly 1. The arrangement directions of the sealing members 406 on both sides are arranged to cross the first direction X and the second direction Y respectively. At least one side of the sealing member 406 forms a ventilation interface 416 connected to the air duct 3.

[0149] Exemplarily, the sealing member 406 may be in the shape of a plate.

[0150] For example, among the sealing members 406 on both sides, the sealing member 406 on one side is stationary relative to the battery cell, and the sealing member 406 on the other side can move closer to or farther away from the battery cell.

[0151] Illustratively, among the sealing members 406 on both sides, the sealing member 406 on one side is connected to at least one of the partition member 21 , the connector 404 and the end stopper 405 , and the sealing member 406 on the other side can be moved closer to or farther away from the battery cell.

[0152] Exemplarily, among the sealing parts 406 on both sides, the sealing part 406 on one side is connected to at least one of the partition sub-part 21, the connecting part 404 and the end stop part 405, and the sealing part 406 on the other side can be moved to be separated from the partition sub-part 21, the connecting part 404 and the end stop part 405.

[0153] Exemplarily, the sealing members 406 on both sides, the connecting members 404 on both sides and the end members 405 on both sides are arranged to form a space for accommodating the battery cell assembly 1 .

[0154] Exemplarily, the sealing members 406 on both sides, the connecting members 404 on both sides and the end blocking members 405 on both sides are arranged to form a closed space for accommodating the battery cell assembly 1 .

[0155] The closed space here means that even if corresponding openings are opened on the sealing member 406, the connecting member 404 and the end block 405 to communicate with the closed space accommodating the battery cell assembly 1, these openings will either be blocked by corresponding structures, or these openings will be externally connected to other relevant working mechanisms during operation, so that the closed space accommodating the battery cell assembly 1 enclosed by the sealing members 406 on both sides, the connecting members 404 on both sides and the end blocks 405 on both sides is almost not connected to the external environment.

[0156] Exemplarily, the ventilation interface 416 on the sealing member 406 is in communication with a pipe of the temperature-regulating fluid circulation system, so that the temperature-regulating fluid circulates in the air duct 3 , the ventilation interface 416 and the temperature-regulating fluid circulation system.

[0157] Illustratively, among the sealing parts 406 on both sides, the sealing part 406 on one side is connected to at least one of the partition sub-component 21, the connecting part 404 and the end stop 405, and the closed space accommodating the battery cell assembly 1 can be opened by moving the sealing part 406 on the other side away from the battery cell or by moving the sealing part 406 on the other side to separate from the partition sub-component 21, the connecting part 404 and the end stop 405.

[0158] Exemplarily, the blocking members 406 on both sides are arranged along a preset direction.

[0159] Exemplarily, the preset directions are arranged along the up-down direction.

[0160] Exemplarily, the box body 400 further includes an outer box 403 , and the separator 2 and the battery cell assembly 1 are located inside the outer box 403 .

[0161] Exemplarily, the connector 404 is located inside the outer box 403 .

[0162] Exemplarily, the end stop 405 is located within the outer box 403 .

[0163] Exemplarily, the sealing member 406 is located inside the outer box 403 .

[0164] Exemplarily, the separator 2 , the battery cell assembly 1 , the connector 404 , the end stop 405 and the sealing member 406 are all located inside the outer box 403 .

[0165] In the embodiment of the present disclosure, sealing members 406 are provided on opposite sides of the battery cell assembly 1, and the battery cell assembly 1 located between the sealing members 406 on both sides is protected along the arrangement direction of the sealing members 406 on both sides, and is connected to the air duct 3 through the ventilation interface 416, so that the temperature control fluid can flow through the air duct 3 through the ventilation interface 416 to exchange heat and control the temperature with the battery cell.

[0166] It is understood that the specific structure of the box 400 is not limited. For example, the box 400 may not be provided with the sealing member 406. For example, the box 400 may not be provided with the connecting member 404, the end stop 405, and the sealing member 406, and the separator 2 and the battery cell assembly 1 are located within the outer box 403.

[0167] In some embodiments, see Figure 6 and Figure 7 The sealing members 406 on both sides are formed with ventilation interfaces 416 communicating with the air duct 3 .

[0168] In the embodiment of the present disclosure, the airflow used to adjust the temperature of the battery cell assembly 1 flows into the air duct 3 from the ventilation interface 416 of the sealing member 406 on one side, and flows out of the air duct 3 from the ventilation interface 416 of the sealing member 406 on the other side, so that the temperature-adjusting airflow flows more smoothly in the air duct 3.

[0169] It is understood that the arrangement of the ventilation ports 416 is not limited. For example, of the two side blocking members 406, one side blocking member 406 is formed with a ventilation port 416 for air intake and a ventilation port 416 for air outlet, both communicating with the air duct 3. The other side blocking member 406 is not provided with a ventilation port 416. The temperature-controlled airflow flows into the air duct 3 through the ventilation port 416 for air intake and flows out of the air duct 3 through the ventilation port 416 for air outlet on the same side. The other side blocking member 406 is closed, and the airflow in the air duct 3 cannot flow out of the other side blocking member 406.

[0170] In some embodiments, see Figure 9 The battery cell includes a shell 14, an electrode assembly 15 located in the shell 14, and an electrode terminal 16 installed on the shell 14. The electrode terminal 16 is electrically connected to the electrode assembly 15. The electrode terminal 16 is located on one side of the electrode assembly 15. The arrangement direction of the electrode terminal 16 and the electrode assembly 15 is a third direction Z, and the third direction Z is arranged to intersect with the first direction X and the second direction Y respectively.

[0171] The outer shell 14 is a shell-like structure outside the battery cell, and is mainly used to accommodate and protect the electrode assembly 15 inside the outer shell 14 .

[0172] The electrode assembly 15 is the main structure for converting electrical energy in the battery cell.

[0173] Illustratively, the electrode assembly 15 is at least partially immersed in the electrolyte, and the electrode assembly 15 is charged through the electrode terminal 16 , or the electrode assembly 15 is powered externally through the electrode terminal 16 .

[0174] The electrode assembly 15 includes a positive electrode 151, a negative electrode 152, and a separator 153. The separator 153 is disposed between the positive electrode 151 and the negative electrode 152. Smaller expansion forces help prevent misalignment between the positive electrode 151, the negative electrode 152, and the separator 153, reducing the possibility of short circuits and thermal runaway in the battery cells.

[0175] Illustratively, the positive electrode 151 may be a positive electrode 151 sheet, and / or the negative electrode 152 may be a negative electrode 152 sheet.

[0176] Illustratively, the isolation member 153 may be an isolation film.

[0177] Illustratively, one of the electrode terminals 16 is electrically connected to the positive electrode 151 , and one of the electrode terminals 16 is electrically connected to the negative electrode 152 .

[0178] Exemplarily, the electrode terminal 16 may be a pole.

[0179] Exemplarily, the third direction Z is perpendicular to the first direction X and the second direction Y, respectively.

[0180] Exemplarily, the third direction Z is arranged along a preset direction.

[0181] In the embodiment of the present disclosure, the third direction Z is arranged to intersect with the first direction X and the second direction Y, so that the position of the separator 2 can avoid the position of the electrode terminal 16 as much as possible, reducing the interference of the separator 2 on the electrical connection between the electrode terminals 16 of each battery cell.

[0182] It is understandable that there is no limitation on the arrangement of the third direction Z. For example, the third direction Z can be arranged along the second direction Y, that is, the partitions 2 on both sides are arranged opposite to each other along the third direction Z.

[0183] In some embodiments, the separator 2 contacts corresponding two adjacent battery cells.

[0184] In some embodiments, see Figure 5 The separator 2 contacts the corresponding two adjacent battery cells, the sum of the sizes of all battery cells between the two adjacent separators 2 along the first direction X along the first direction X is the first size, the size of the separator 2 along the first direction X is the second size, and the ratio of the second size to the first size is 2%~10%.

[0185] For example, see Figure 5 The first dimension shown in the figure is D, the second dimension shown in the figure is d, the ratio of the second dimension to the first dimension is d / D, and 2%≤d / D≤10%.

[0186] Illustratively, the ratio of the second dimension to the first dimension is 2%, 3%, 5%, 7%, 9% or 10%.

[0187] For example, see Figure 5 The first dimension shown in the figure is D, the second dimension shown in the figure is d, the ratio of the second dimension to the first dimension is d / D, and 3%≤d / D≤6%.

[0188] Exemplarily, the ratio of the second size to the first size is 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, or 6%.

[0189] In the disclosed embodiment, the electrode assembly 15 expands during the charge and discharge process. The ratio of the second dimension to the first dimension is within a relatively suitable range. The second dimension is relatively suitable for the first dimension of all battery cells between two adjacent separators 2 along the first direction X. The air duct 3 has a suitable space, which facilitates improving the heat exchange effect of the temperature-controlled airflow passing through the air duct 3. The air duct 3 also provides relatively suitable expansion space for the corresponding battery cells, reducing the expansion force on the corresponding battery cells. The second dimension is relatively suitable for the first dimension of all battery cells between two adjacent separators 2 along the first direction X, resulting in the battery device 100 having relatively suitable mass energy density and dynamic performance.

[0190] Reducing the expansion force on the corresponding battery cell so that the expansion force of the electrode assembly 15 of the battery cell on the housing 14 is smaller is beneficial to suppressing the possibility of the housing 14 bulging or rupturing under the action of the expansion force.

[0191] The air duct 3 provides a more suitable expansion space for the corresponding battery cell, so that the electrode assembly 15 has a more suitable space to expand, which can reduce the possibility of the electrode assembly 15 being damaged under the squeezing action of the expansion force, thereby inhibiting the capacity attenuation of the battery cell and improving the cycle life of the battery cell.

[0192] Reducing the expansion force on the corresponding battery cell makes the expansion force of the electrode assembly 15 of the corresponding battery cell smaller, which is beneficial to suppressing the misalignment of the internal structure of the electrode assembly 15 and thus reducing the possibility of short circuit and thermal runaway.

[0193] The expansion force on the corresponding battery cells is reduced, so that the expansion force on the housing 14 is smaller, which is beneficial to suppressing the damage of the seal of the housing 14 and reducing the possibility of electrolyte leakage in the housing 14.

[0194] In some embodiments, see Figure 4 、 Figure 5 、 Figure 7 and Figure 8Among the battery cells of the battery cell assembly 1, at least two battery cells are first battery cells 12, and at least one battery cell is a second battery cell 13. During operation, the heat released by the first battery cell 12 per unit time is greater than the heat released by the second battery cell 13 per unit time. The separator 2 is located between two adjacent first battery cells 12 arranged along the first direction X.

[0195] For example, see Figure 4 、 Figure 5 、 Figure 7 and Figure 8 The number of battery cells between at least two adjacent separators 2 along the first direction X is at least three, the battery cell closest to one of the two adjacent separators 2 is the first battery cell 12, the battery cell closest to the other separator 2 of the two adjacent separators 2 is the first battery cell 12, and the battery cell between the two first battery cells 12 is the second battery cell 13.

[0196] For example, see Figure 4 、 Figure 5 and Figure 7 The number of battery cells between at least two adjacent separators 2 along the first direction X is three, and the three battery cells are the first battery cell 12, the second battery cell 13 and the first battery cell 12. The second battery cell 13 is located between the two first battery cells 12 along the first direction X.

[0197] For example, see Figure 8 The number of battery cells between at least two adjacent separators 2 along the first direction X may be four, and the four battery cells are sequentially a first battery cell 12, a second battery cell 13, a second battery cell 13 and a first battery cell 12. The second battery cell 13 is located between two first battery cells 12.

[0198] For example, the heat released by the first battery cell 12 and the heat released by the second battery cell 13 can both be measured by a calorimeter.

[0199] In the disclosed embodiment, since the first battery cells 12 release a large amount of heat, the separator 2 is arranged between two adjacent first battery cells 12 arranged along the first direction X. This can specifically cool the first battery cells 12 that generate a large amount of heat, thereby better alleviating the situation where the local temperature of the battery device 100 is high.

[0200] It is understood that the arrangement of the separator 2 is not limited. For example, a separator 2 can be set between every two adjacent battery cells. For example, a separator 2 can be set between adjacent first battery cells 12 and second battery cells 13. For example, a separator 2 can be set between two adjacent second battery cells 13. For example, the heat released per unit time by all battery cells in the battery device 100 can be the same. For example, there are three or more battery cells in the battery device 100, and the heat released per unit time is different.

[0201] In some embodiments, see Figure 4 、 Figure 5 、 Figure 7 and Figure 8 The first battery cell 12 is a ternary lithium battery, and the second battery cell 13 is a lithium iron phosphate battery.

[0202] The positive electrode 151 of the electrode assembly 15 of the battery cell includes a current collector having a positive polarity and a positive electrode 151 active material disposed on the current collector.

[0203] A ternary lithium battery refers to a battery cell in which the active material of the positive electrode 151 is a ternary lithium material.

[0204] Illustratively, the ternary lithium material may be lithium nickel cobalt manganese oxide or lithium nickel cobalt aluminum oxide.

[0205] Lithium iron phosphate battery refers to a battery cell in which the active material of the positive electrode 151 is lithium iron phosphate.

[0206] In the embodiment of the present disclosure, the heat released per unit time by the ternary lithium battery is greater than that released by the lithium iron phosphate battery.

[0207] It is understandable that the specific types of the first battery cell 12 and the second battery cell 13 are not limited, as long as the heat released by the first battery cell 12 per unit time is greater than the heat released by the second battery cell 13 per unit time.

[0208] In some embodiments, see Figure 10 and Figure 11 The battery cell includes a shell 14, an electrode assembly 15 located in the shell 14, and an electrode terminal 16 installed on the shell 14. The electrode terminal 16 is electrically connected to the electrode assembly 15. The electrode assembly 15 includes a positive electrode 151, a negative electrode 152 and an isolation member 153. An isolation member 153 is arranged between the positive electrode 151 and the negative electrode 152. The electrode assembly 15 has a straight area 154. The positive electrode 151 and the negative electrode 152 are stacked in the straight area 154 along a first direction X.

[0209] For example, see Figure 11The electrode assembly 15 is a laminated electrode assembly 15 , in which the positive electrode 151 and the negative electrode 152 are stacked along a first direction X.

[0210] For example, see Figure 10 The electrode assembly 15 is a wound electrode assembly 15, and the electrode assembly 15 has a corner area 155. Corner areas 155 are set on opposite sides of the straight area 154. The stacking direction of the positive electrode 151 and the negative electrode 152 in the straight area 154 is arranged crosswise with the arrangement direction of the corner areas 155 on both sides.

[0211] Exemplarily, the stacking direction of the positive electrode 151 and the negative electrode 152 in the straight region 154 is perpendicular to the arrangement direction of the corner regions 155 on both sides.

[0212] In the embodiment of the present disclosure, the area of ​​the projection area formed by the electrode assembly 15 projected in the direction of arrangement of the positive electrode 151 and the negative electrode 152 in the straight area 154 is relatively large, and the area of ​​the surface of the corresponding battery cell perpendicular to the direction of arrangement of the positive electrode 151 and the negative electrode 152 in the straight area 154 is relatively large. The heat released by the battery cell toward the side of the surface with a larger area is relatively large, and the positive electrode 151 and the negative electrode 152 are stacked in the straight area 154 along the first direction X, so that the surface of the battery cell with a larger area faces the air duct 3, which is conducive to the temperature-controlled airflow flowing through the air duct 3 to better cool the surface of the battery cell with a larger area.

[0213] It is understood that the arrangement of the battery cells is not limited. For example, the direction in which the positive electrode 151 and the negative electrode 152 are stacked in the straight region 154 may be perpendicular to the first direction X.

[0214] In some embodiments, see Figures 3 to 11The battery device 100 includes a housing 400, a battery cell assembly 1, and a separator 2. The battery cell assembly 1 is located within the housing 400 and includes at least two battery cells. The direction in which the at least two battery cells are arranged in sequence is a first direction X. A separator 2 is provided between two adjacent battery cells along the first direction X. The separator 2 and the corresponding two adjacent battery cells form an air duct 3. Among the battery cells of the battery cell assembly 1, at least two battery cells are first battery cells 12, and at least one battery cell is a second battery cell 13. During operation, the heat released per unit time by the first battery cell 12 is greater than the heat released per unit time by the second battery cell 13. The separator 2 is located between two adjacent first battery cells 12 arranged along the first direction X. The first battery cell 12 is a ternary lithium battery, and the second battery cell 13 is a lithium iron phosphate battery. The separator 2 contacts two corresponding adjacent battery cells. The sum of the dimensions of all battery cells between two adjacent separators 2 along a first direction X is the first dimension. The dimension of the separator 2 along the first direction X is the second dimension, and the ratio of the second dimension to the first dimension is 2% to 10%. The ratio of the second dimension to the first dimension is 3% to 6%. By enclosing the separator 2 and the corresponding battery cells to form an air duct 3, the use of thermal insulation pads between adjacent battery cells can be reduced. The number of battery cells between at least two adjacent separators 2 along the first direction X can be four, and the four battery cells are, in order, the first battery cell 12, the second battery cell 13, the second battery cell 13, and the first battery cell 12. The second battery cell 13 is located between the two first battery cells 12. The dimension of the first battery cell 12 along the second direction Y is equal to the dimension of the second battery cell 13 along the second direction Y. The dimension of the first battery cell 12 along the third direction Z is equal to the dimension of the second battery cell 13 along the third direction Z.

[0215] The above embodiments are intended only to illustrate the technical solutions of the present application and are not intended to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they may modify the technical solutions described in the above embodiments or replace some or all of the technical features therein with equivalents. Such modifications or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the technical solutions of the embodiments of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts.

Claims

1. A battery device, characterized in that: include: Box; A battery cell assembly is located in the box, wherein the battery cell assembly includes at least two battery cells, and the direction in which the at least two battery cells are arranged in sequence is a first direction; A separator is provided between two adjacent battery cells along the first direction, and the separator and the corresponding two adjacent battery cells form an air duct; Among the battery cells of the battery cell assembly, at least two battery cells are first battery cells, and at least one battery cell is a second battery cell. During operation, the heat released by the first battery cell per unit time is greater than the heat released by the second battery cell per unit time, and the separator is located between two adjacent first battery cells arranged along the first direction.

2. The battery device according to claim 1, wherein: The separator includes a separator sub-component, and the separator sub-components are arranged on opposite sides of the battery cell along the second direction. The second direction is arranged crosswise with the first direction, and the separator sub-components on both sides are arranged at intervals. The separator sub-components on both sides and the corresponding two adjacent battery cells are arranged to form the air duct.

3. The battery device according to claim 2, characterized in that Among the partition sub-components on the opposite sides of the battery cell assembly along the second direction, the number of the partition sub-components on each side is at least two, and the box body also includes a connecting member, and the connecting member is provided on the opposite sides of the battery cell assembly along the second direction, and the connecting member on each side is respectively connected to at least two of the partition sub-components on the corresponding side.

4. The battery device according to claim 3, characterized in that The box body further includes end blocks, and the end blocks are provided at both opposite ends of the battery cell assembly along the first direction, and the end blocks at each end are respectively connected to the connecting members on both sides.

5. The battery device according to claim 2, wherein: The box body also includes a sealing member, which is provided on opposite sides of the battery cell assembly. The arrangement directions of the sealing members on both sides are respectively arranged to intersect with the first direction and the second direction. At least one side of the sealing member forms a ventilation interface connected to the air duct.

6. The battery device according to claim 5, characterized in that The sealing members on both sides are formed with ventilation interfaces communicated with the air duct.

7. The battery device according to claim 2, wherein: The battery cell includes a shell, an electrode assembly located in the shell, and an electrode terminal installed on the shell, the electrode terminal is electrically connected to the electrode assembly, the electrode terminal is located on one side of the electrode assembly, and the arrangement direction of the electrode terminal and the electrode assembly is a third direction, and the third direction is arranged to intersect with the first direction and the second direction respectively.

8. The battery device according to any one of claims 1 to 7, characterized in that: The separator contacts the corresponding two adjacent battery cells, the sum of the sizes of all battery cells between the two adjacent separators along the first direction is a first size, the size of the separator along the first direction is a second size, and the ratio of the second size to the first size is 2%~10%.

9. The battery device according to any one of claims 1 to 7, characterized in that: The first battery cell is a ternary lithium battery, and the second battery cell is a lithium iron phosphate battery.

10. The battery device according to any one of claims 1 to 7, characterized in that: The battery cell includes a shell, an electrode assembly located in the shell, and an electrode terminal installed on the shell, the electrode terminal is electrically connected to the electrode assembly, the electrode assembly includes a positive electrode, a negative electrode and an isolating member, the isolating member is arranged between the positive electrode and the negative electrode, the electrode assembly has a straight area, and the positive electrode and the negative electrode are stacked in the flat area along the first direction.

11. An electrical device, characterized in that: The battery device comprises a battery device according to any one of claims 1 to 10, wherein the battery device is used to store or provide electrical energy.

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