Battery device, electric equipment and energy storage equipment

Abstract

The utility model discloses a battery device, electric equipment and energy storage equipment. The battery device comprises a plurality of battery monomer assemblies, a box body and a heat management component, each battery monomer assembly comprises a plurality of battery monomers arranged along a first direction, and the plurality of battery monomer assemblies are arranged along a second direction; the box body comprises a first box body and a second box body, the first box body and the second box body are mutually buckled and connected, the first box body and the second box body jointly define a containing space, the battery monomer assembly is located in the containing space, and the first direction intersects with the height direction of the box body; the heat management part is located on the side, facing the first box body, of the battery monomer assembly and comprises a heat exchange pipe, the heat exchange pipe is in heat conduction connection with the multiple battery monomers, and at least part of every two adjacent battery monomer assemblies are jointly in heat conduction connection with one limiting section. The heat exchange tubes are arranged in the box body, so that the heat exchange tubes are in heat conduction connection with the battery monomers, heat transfer paths between the heat exchange tubes and the battery monomers can be reduced, and the heat exchange efficiency is improved.

Description

Technical Field

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

[0002] In the current field of battery thermal management, the battery mainly uses a water cooling plate to regulate the temperature of the battery cells inside the battery. Usually, the water cooling plate is installed at the bottom of the box. This layout can achieve the regulation of the battery cell temperature to a certain extent. However, in the process of heat exchange between the water cooling plate and the battery cells in the battery, there is a problem of low heat exchange efficiency due to the long heat exchange path. Utility Model Content

[0003] In view of the above problems, the present application provides a battery device, an electrical device and an energy storage device. By arranging heat exchange tubes in the box body, the problem of a long heat exchange path between the water cooling plate and the battery cell in the prior art can be improved.

[0004] In a first aspect, the present application provides a battery device, comprising:

[0005] A plurality of battery cell assemblies, wherein the battery cell assemblies include a plurality of battery cells arranged along a first direction, and the plurality of battery cell assemblies are arranged along a second direction;

[0006] A box body, comprising a first box body and a second box body, the first box body and the second box body are interlocked and connected to each other, the first box body and the second box body jointly define a storage space, the battery cell assembly is located in the storage space, the battery cell has a first electrode terminal and a second electrode terminal on a side facing the first box body, the first electrode terminal and the second electrode terminal are arranged at intervals along a second direction, the first direction and the second direction intersect, and a plane where the first direction and the second direction are located intersects with a height direction of the box body;

[0007] A thermal management component is located on a side of the battery cell assembly facing the first box body, the thermal management component includes a heat exchange tube, the heat exchange tube includes a bending section and a limiting section extending along the first direction, at least one end of the limiting section is connected to the bending section, the limiting section is thermally connected to a plurality of battery cells, and at least part of two adjacent battery cell assemblies are thermally connected to one limiting section;

[0008] Along the second direction, a side of the first electrode terminal facing away from the second electrode terminal is provided with a limiting section, and / or a side of the second electrode terminal facing away from the first electrode terminal is provided with a limiting section.

[0009] The heat exchange tube is arranged in the box body, and the limit section is thermally connected to the battery cell, which can reduce the heat transfer path between the heat exchange tube and the battery cell, that is, the heat exchange tube does not exchange heat with the battery cell through the bottom wall of the box body, thereby improving the heat exchange efficiency; at the same time, the heat exchange tube is thermally connected to multiple battery cells, which can also save the trouble of traditionally constraining the battery cell through pressure strips, making the structure more compact; by setting the limit section and two adjacent battery cell assemblies sharing one limit section, multiple battery cell assemblies can be constrained, the stability of the connection between the battery cell assemblies is enhanced, and the overall structure of the battery device is more solid and reliable; at the same time, two adjacent battery cells share one limit section, which can reduce the material usage of the heat exchange tube.

[0010] In some embodiments, a limiting section is provided between the first electrode terminal and the second electrode terminal.

[0011] In this way, the area of ​​the thermal connection between the limit section and the battery cell can be increased to improve the heat exchange efficiency, so that the temperature of the pressure relief mechanism and the electrode terminal can be adjusted more quickly to reduce the possibility of thermal runaway and electrical connection failure, and improve the reliability and stability of the battery cell operation.

[0012] In some embodiments, the battery cell has a pressure relief mechanism on the side facing the first box body, which is used to release the gas in the battery cell when the battery cell thermally runs away. Along the height direction of the box body, the positive projection of the heat exchange tube on the first box body is located outside the positive projection of the pressure relief mechanism on the first box body.

[0013] Thereby, the limiting section can avoid the pressure relief mechanism, so that the high-temperature and high-pressure gas can be discharged smoothly when the battery cell is thermally runaway, thereby improving the safety of the battery cell.

[0014] In some embodiments, a limiting section is provided between the first electrode terminal and the pressure relief mechanism; and / or a limiting section is provided between the second electrode terminal and the pressure relief mechanism.

[0015] In this way, the area of ​​the thermal connection between the limit section and the battery cell can be increased to improve the heat exchange efficiency, so that the temperature of the pressure relief mechanism and the electrode terminal can be adjusted more quickly to reduce the possibility of thermal runaway and electrical connection failure, and improve the reliability and stability of the battery cell operation.

[0016] In some embodiments, a side of the battery cell facing away from the first box body has a pressure relief mechanism, and the pressure relief mechanism is used to release gas in the battery cell when the battery cell thermally runs away.

[0017] When installing a battery cell, the first electrode terminal and the second electrode terminal are usually connected with electrical connection components, and on the side of the battery cell having the first electrode terminal and the second electrode terminal, there are some detection components for monitoring the working parameters of the battery cell. On the side of the battery cell facing away from the first box body, there is a pressure relief mechanism. When the battery cell undergoes thermal runaway, it can reduce the influence of the high-temperature gas discharged by the pressure relief mechanism on some detection components and electrical connection components, further reducing the short-circuit risk caused by connection failure, etc., so as to improve the safety of the battery device; at the same time, it can enable the battery cell to have a larger contact area for heat conduction connection with the heat exchange tube, so as to improve the heat exchange effect.

[0018] In some embodiments, the heat exchange tube is bonded to the battery cell.

[0019] Thereby, the constraint of the heat exchange tube on the battery cell can be improved. When multiple battery cells expand, the possibility of the electrical connection components in the battery device failing due to different expansion amounts of the multiple battery cells can be reduced, and the reliability and stability of the battery device during operation can be improved.

[0020] In some embodiments, the number of the limiting segments is multiple, the multiple limiting segments are arranged at intervals along the second direction, and the ends of the limiting segments are connected in series with bending segments.

[0021] Thereby, the heat exchange tube can be coiled in the box body, so that the heat exchange tube can be flexibly arranged according to the arrangement mode of multiple battery cells. By bending, the overall length of the heat exchange tube can be increased, so as to improve the heat exchange effect.

[0022] In some embodiments, at least one of the bending segment and the limiting segment is a flat tube, and the thickness direction of the flat tube is the same as the height direction of the box body.

[0023] Compared with the heat exchange tube being a circular tube, the flat tube can increase the heat conduction area with the battery cell. On the premise that other heat exchange parameters such as flow rate and flow velocity remain unchanged, the heat exchange efficiency can be improved.

[0024] In a second aspect, the present application provides an electrical equipment, including the battery device of the first aspect, and the battery device is used to supply electrical energy to the electrical equipment.

[0025] In a third aspect, the present application provides an energy storage device, including a cabinet body and at least one battery cluster. The battery cluster is accommodated in the cabinet body, and the battery cluster includes multiple battery devices of the first aspect.

[0026] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically gives the specific implementation manners of the present application. Description of the Drawings

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the following detailed description of the preferred embodiments. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present application. Also, in all the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0028] Figure 1 is an exploded view of a battery device according to some embodiments of the present application;

[0029] Figure 2 is a top view of the positional relationship between the heat exchange tube and the battery cell assembly in the battery device according to some embodiments of the present application;

[0030] Figure 3 is a top view of the positional relationship between the heat exchange tube and the battery cell assembly in the battery device according to some embodiments of the present application;

[0031] Figure 4 is a side view of the positional relationship between the heat exchange tube and the battery cell assembly in a battery device according to some embodiments of the present application;

[0032] Figure 5 is Figure 4 a partial enlarged view of I;

[0033] Figure 6 is Figure 4 a partial enlarged view of II;

[0034] Figure 7 is a side view of the positional relationship between the heat exchange tube and the battery cell assembly in a battery device according to some embodiments of the present application;

[0035] Figure 8 is Figure 7 a partial enlarged view of III;

[0036] Figure 9 is a structural diagram of a battery cell in a battery device according to some embodiments of the present application;

[0037] Figure 10 is a structural diagram of an electrical device being a vehicle according to some embodiments of the present application;

[0038] Figure 11 is an axonometric view of an energy storage device according to some embodiments of the present application.

[0039] The reference numerals in the specific embodiments are as follows:

[0040] 1000, vehicle; 200, controller; 300, motor;

[0041] 100, battery device;

[0042] 10. Battery cell assembly; 11. Battery cell; 111. Housing; 1111. First electrode terminal; 1112. Second electrode terminal; 1113. Pressure relief mechanism;

[0043] 20. Box body; 21. First box body; 22. Second box body;

[0044] 30. Thermal management component; 31. Heat exchange tube; 311. Limiting section; 312. Bending section;

[0045] 2000. Energy storage device; 2100. Cabinet; 2200. Battery cluster;

[0046] X. First direction; Y. Second direction; Z. Height direction. Detailed implementation manners

[0047] Hereinafter, embodiments of the technical solutions 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 solutions of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

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

[0049] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0050] Referring to "embodiments" herein means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0051] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0052] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0053] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of the present application.

[0054] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0055] The battery device (Battery Apparatus) mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0056] In some embodiments, the battery cell assembly (Battery Cell Assembly) is usually formed by arranging a plurality of battery cells.

[0057] As an example, the battery cell assembly can 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 can be formed by bundling multiple battery cells with cable ties.

[0058] In some embodiments, the battery device can be a battery pack, which includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0059] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0060] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing multiple battery cells to the box body.

[0061] As an example, the box body can include a first box body and a second box body. The first box body and the second box body are snapped together to accommodate the battery cell assembly.

[0062] As an example, the box body can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0063] In some embodiments, the box body can be a part of the chassis structure of a vehicle. For example, a part of the box body can be at least a part of the bottom plate of the vehicle, or a part of the box body can be at least a part of the cross beam and longitudinal beam of the vehicle.

[0064] The technical solutions described in the embodiments of the present application are applicable to various electrical equipment using battery devices, such as battery-powered vehicles, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0065] In some embodiments, the battery cell can be a secondary battery, which refers to a battery cell that can activate the active material and continue to be used by charging after discharging.

[0066] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0067] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator disposed between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell, active ions such as lithium ions are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent short circuit between the positive and negative electrodes and allow active ions to pass through at the same time.

[0068] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0069] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0070] As an example, the positive electrode current collector may be made of a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, pure metals, alloys, and surface-treated metals may be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material fiber layer and a metal layer. The composite current collector may be formed by forming a metal material such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy on a substrate of a polymer material such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, and polyethylene.

[0071] 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 conventional 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. Among them, examples of lithium-containing phosphates may include but are not limited to lithium iron phosphate (such as LiFePO 4， which may also be abbreviated as LFP), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4） , a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and at least one of a composite material of lithium manganese iron phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO 2） , lithium nickel oxide (such as LiNiO 2） , lithium manganese oxide (such as LiMnO2, LiMn2O 4） , 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 O 2， which may also be abbreviated as NCM 333; LiNi 0.5 Co 0.2 Mn 0.3 O 2， It can also be simply referred to as NCM 523 ; LiNi 0.5 Co 0.25 Mn 0.25 O 2， It can also be simply referred to as NCM 211 ; LiNi 0.6 Co 0.2 Mn 0.2 O 2， It can also be simply referred to as NCM 622 ; LiNi 0.8 Co 0.1 Mn 0.1 O 2， It can also be simply referred to as NCM 811） , lithium nickel cobalt aluminum oxide (such as LiNi 0.8 Co 0.15 Al 0.05 O 2） and at least one of its modified compounds, etc. The modified compound refers to a substance obtained by means of modification such as doping or coating on the basis of the above substances.

[0072] In some embodiments, the positive electrode can be made of foam metal. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy or foam carbon, etc. When the foam metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foam metal, and of course, the positive electrode active material can also be provided. As an example, the positive electrode active material is filled and / or deposited in the foam metal.

[0073] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0074] As an example, the negative electrode current collector can be made of a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, pure metal, alloy, or metal with surface treatment can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium or silver, etc. The composite current collector can include a polymer material fiber 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, etc.) on a substrate of a polymer material (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0075] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0076] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0077] As an example, the negative electrode active material can be the negative electrode active material for battery cells well-known in the art. As an example, the negative electrode active material can 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, etc. The silicon-based materials can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials can be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as the negative electrode active material of battery cells can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0078] In some embodiments, the negative electrode can be made of foam metal. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. When the foam metal is used as the negative electrode sheet, the negative electrode active material may not be provided on the surface of the foam metal, and of course, the negative electrode active material can also be provided.

[0079] As an example, the negative electrode active material can be filled and / or deposited in the negative electrode current collector.

[0080] 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.

[0081] In some embodiments, the electrode assembly further includes a separator, and the separator is disposed between the positive electrode and the negative electrode.

[0082] In some embodiments, the separator is a separator membrane. The present application has no particular limitation on the type of the separator membrane, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0083] As an example, the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator membrane can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator membrane 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 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 coated on the surface of the separator membrane.

[0084] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0085] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. There is no specific limitation on the type of the electrolyte in this application, and it can be selected according to requirements. The electrolyte can be liquid, gel or solid.

[0086] Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0087] In some embodiments, the electrolyte salt can 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 difluoro(oxalato)borate, lithium bis(oxalato)borate, lithium difluoro bis(oxalato)phosphate and lithium tetrafluoro(oxalato)phosphate.

[0088] 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, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be an ether solvent. The ether solvent 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.

[0089] In some embodiments, the electrolyte solution may optionally further include additives. For example, the additives can include negative electrode film-forming additives, or can include positive electrode film-forming additives, and can also include additives that can improve certain properties of the battery cell, such as additives for improving the overcharge / quick charge performance of the battery cell, additives for improving the high-temperature performance of the battery cell, additives for improving the low-temperature performance of the battery cell, etc.

[0090] Among them, the gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0091] Among them, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0092] As an example, the polymer of the polymer solid electrolyte can include polyether polyethylene oxide, polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, polyionic liquid, cellulose, etc.

[0093] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superionic conductor lithium germanium phosphorus sulfur, argyrodite, amorphous sulfide), or one or more of a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte).

[0094] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0095] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of winding and stacking.

[0096] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0097] In some embodiments, the electrode assembly is a stacked structure.

[0098] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be respectively provided, and the multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked.

[0099] As an example, multiple positive electrode sheets can be provided, and the negative electrode sheet is folded to form multiple stacked folding segments, and a positive electrode sheet is clamped between adjacent folding segments.

[0100] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple stacked folding segments.

[0101] As an example, multiple separators can be provided and are respectively arranged between any adjacent positive electrode sheets or negative electrode sheets.

[0102] As an example, the separators can be continuously provided and are arranged between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0103] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or prismatic, etc.

[0104] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include positive tabs and negative tabs.

[0105] In some embodiments, the battery cell can include a housing. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), or a composite metal shell (such as a copper-aluminum composite shell, etc.). In some embodiments, the housing can be a sealed structure or a non-sealed structure.

[0106] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery (for example, a hexagonal prism battery, etc.), and there is no special limitation in this application.

[0107] In some embodiments, the outer casing includes an end cap and a housing. The housing is provided with an opening, and the end cap covers the opening. The housing can be provided with one or more openings. One or more end caps can also be provided.

[0108] In some embodiments, at least one electrode terminal is provided on the outer casing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collector member. The electrode terminal can be provided on the end cap or on the housing.

[0109] In some embodiments, a pressure relief mechanism is provided on the outer casing. The pressure relief mechanism is used to discharge the internal gas of the battery cell.

[0110] As an example, it is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches a predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is damaged, thereby forming an opening or a channel for releasing the internal pressure or temperature. The design of this threshold varies according to different design requirements. The threshold may depend on one or several materials among the positive electrode sheet, negative electrode sheet, electrolyte and separator in the battery cell.

[0111] As an example, the pressure relief mechanism can be integrally formed with the outer casing.

[0112] As an example, the pressure relief mechanism can also be separately provided and connected to the outer casing.

[0113] The "actuation" mentioned in this application means that the pressure relief mechanism generates an action or is activated to a certain state, so that the internal pressure and temperature of the battery cell can be released. The actions generated by the pressure relief mechanism can include but are not limited to: the components in the pressure relief mechanism move to form an exhaust channel, at least a part of the pressure relief mechanism breaks, is crushed, is torn or opened, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell are discharged outward from the actuated part as emissions. In this way, the battery cell can be depressurized and cooled under controlled pressure or temperature, thereby avoiding potential more serious accidents.

[0114] In some embodiments, when the outer casing is a non-sealed structure, the pressure relief mechanism can be set as a through hole for discharging the internal gas of the battery cell.

[0115] The emissions from the battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode sheets, fragments of separators, high-temperature and high-pressure gases produced by the reaction, flames, and the like.

[0116] For the convenience of explanation, please refer to the following examples. Figures 1-9 , a battery cell in some embodiments of the present application is taken as an example for explanation.

[0117] The battery device 100 includes a battery cell assembly 10, a box 20 and a thermal management component 30. The battery cell assembly 10 includes a plurality of battery cells 11 arranged along a first direction X. The box 20 includes a first box 21 and a second box 22, which are interlocked and connected to each other, and the first box 21 and the second box 22 jointly define a storage space, and the battery cell assembly 10 is located in the storage space. The battery cell 11 has a first electrode terminal 1111 and a second electrode terminal 1112 on the side facing the first box 21, and the first electrode terminal 1111 and the second electrode terminal 1112 are arranged at intervals along a second direction Y, and the first direction X and the second direction Y intersect, and the plane where the first direction X and the second direction Y are located intersects with the height direction Z of the box 20, and the first direction X intersects with the height direction Z of the box 20. The heat management component 30 is located on the side of the battery cell assembly 10 facing the first box body 21. The heat management component 30 includes a heat exchange tube 31. The heat exchange tube 31 includes a bending section 312 and a limiting section 311 extending along the first direction X. At least one end of the limiting section 311 is connected to the bending section 312. The limiting section 311 is thermally connected to the plurality of battery cells 11. Along the second direction Y, the limiting section 311 is provided on the side of the first electrode terminal 1111 away from the second electrode terminal 1112, and / or the limiting section 311 is provided on the side of the second electrode terminal 1112 away from the first electrode terminal 1111.

[0118] The heat exchange tube 31 can adopt different structural forms, such as the heat exchange tube 31 can be a straight tube or a tube with a bent structure. The heat exchange tube 31 can be a metal tube or a non-metal tube, such as a copper tube, to improve the thermal conductivity of the heat exchange tube 31.

[0119] The heat exchange medium in the heat exchange tube 31 can be liquid or gas, such as water, ethylene glycol aqueous solution, etc.

[0120] Thermal conductive connection refers to a connection method between two or more objects that can effectively transfer heat.

[0121] The heat-conductive connection includes direct contact or indirect contact, such as bonding, between the heat exchange tube 31 and the battery cell 11 .

[0122] Two adjacent battery cells 11 may be electrically connected via a busbar, such as in series or in parallel.

[0123] Figure 5 and Figure 6 illustrates the structural relationship between the heat exchange tube 31 and the battery cell 11 when the first box body 21 is located above the second box body 22, that is, the positional relationship between the heat exchange tube 31 and the battery cell 11 when the battery device 100 is installed upright. Figure 7 and Figure 8 illustrates the structural relationship between the heat exchange tube 31 and the battery cell 11 when the first box body 21 is located below the second box body 22, that is, the positional relationship between the heat exchange tube 31 and the battery cell 11 when the battery device 100 is installed upside down.

[0124] By arranging the heat exchange tube 31 inside the box body 20 so that the heat exchange tube 31 is thermally connected to the battery cell 11, the heat transfer path between the heat exchange tube 31 and the battery cell 11 can be reduced, that is, the heat exchange tube 31 does not exchange heat with the battery cell 11 through the bottom wall of the box body 20, improving the heat exchange efficiency; at the same time, the heat exchange tube 31 is thermally connected to multiple battery cells 11, and the trouble of restraining the battery cells 11 by conventional pressure strips can also be saved, making the structure more compact.

[0125] In some embodiments, please refer to Figure 1 and Figure 2 , a limiting section 311 is provided between the first electrode terminal 1111 and the second electrode terminal 1112.

[0126] A pressure relief mechanism 1113 may or may not be provided between the first electrode terminal 1111 and the second electrode terminal 1112.

[0127] Thus, the heat conduction connection area between the limiting section 311 and the battery cell 11 can be increased to improve the heat exchange efficiency, so as to be able to adjust the temperature of the pressure relief mechanism 1113 and the electrode terminal more quickly, reducing the possibility of thermal runaway and electrical connection failure, and improving the reliability and stability of the battery cell 11 during operation.

[0128] In some embodiments, please refer to Figure 3 , one side of the battery cell 11 facing the first box body 21 has a pressure relief mechanism 1113, and the pressure relief mechanism 1113 is used to release the gas inside the battery cell 11 when the battery cell 11 is out of control thermally. Along the height direction Z of the box body 20, the orthographic projection of the heat exchange tube 31 on the first box body 21 is located outside the orthographic projection of the pressure relief mechanism 1113 on the first box body 21.

[0129] As an example, the battery cell 11 includes a housing 111. On one side of the housing 111 facing the first box body 21, a pressure relief mechanism 1113 is provided. The pressure relief mechanism 1113 can be an explosion-proof valve or a weak area formed by scoring the housing 111. When the battery cell 11 is in thermal runaway, the weak area or the explosion-proof valve opens after the internal pressure of the housing 111 reaches a set value to discharge the gas inside the battery cell 11.

[0130] Along the height direction Z of the box body 20, the orthographic projection of the heat exchange tube 31 on the first box body 21 is located outside the orthographic projection of the pressure relief mechanism 1113 on the first box body 21, which means that when performing an orthographic projection from the height direction Z of the box body 20, the orthographic projection area formed by the heat exchange tube 31 on the bottom surface of the first box body 21 is completely located outside the orthographic projection area formed by the pressure relief mechanism 1113 on the same bottom surface.

[0131] Thus, the heat exchange tube 31 can be prevented from blocking the pressure relief mechanism 1113, so that the pressure relief mechanism 1113 can relieve the pressure inside the battery cell 11 during thermal runaway, thereby improving the safety of the battery device 100.

[0132] In some embodiments, please refer to Figure 2 , a limiting section 311 is provided between the first electrode terminal 1111 and the pressure relief mechanism 1113; and / or, a limiting section 311 is provided between the second electrode terminal 1112 and the pressure relief mechanism 1113.

[0133] Figure 2 shows an example in which multiple rows of battery cell assemblies 10 are arranged along the second direction Y. For the same battery cell assembly 10, the limiting section 311 extends along the first direction X and is provided between the pressure relief mechanism 1113 and the first electrode terminal 1111 of each battery cell 11, or between the pressure relief mechanism 1113 and the second electrode terminal 1112 of each battery cell 11 to adjust the temperature of the pressure relief mechanism 1113, the first electrode terminal 1111, the second electrode terminal 1112 and the areas near them of multiple battery cells 11.

[0134] Thus, heat exchange can be performed on the position between the pressure relief mechanism 1113 and the first electrode terminal 1111 of the battery cell 11, and / or on the position between the second electrode terminal 1112 and the pressure relief mechanism 1113, so as to be able to adjust the temperature of the pressure relief mechanism 1113, the first electrode terminal 1111, the second electrode terminal 1112 and the areas near them more quickly, reduce the possibility of thermal runaway and electrical connection failure, and improve the reliability and stability of the operation of the battery cell 11.

[0135] In some embodiments, please refer to Figure 3, on the side of the battery cell 11 facing away from the first box body 21, there is a pressure relief mechanism 1113, and the pressure relief mechanism 1113 is used to release the gas inside the battery cell 11 when the battery cell 11 is in thermal runaway.

[0136] When the battery cell 11 is installed, the first electrode terminal 1111 and the second electrode terminal 1112 are usually connected with electrical connection components, and on the side of the battery cell 11 with the first electrode terminal 1111 and the second electrode terminal 1112, there are some detection components for monitoring the working parameters of the battery cell 11. On the side of the battery cell 11 facing away from the first box body 21, there is a pressure relief mechanism 1113. When the battery cell 11 is in thermal runaway, it can reduce the influence of the high-temperature gas discharged by the pressure relief mechanism 1113 on some detection components and electrical connection components, further reduce the short-circuit risk caused by connection failure, etc., so as to improve the safety of the battery device 100; at the same time, it can make the battery cell 11 have a larger contact area and be thermally connected with the heat exchange tube 31 to improve the heat exchange effect.

[0137] In some embodiments, the heat exchange tube 31 is bonded to the battery cell 11.

[0138] Thus, it can improve the constraint of the heat exchange tube 31 on the battery cell 11, so as to reduce the possibility of the electrical connection components in the battery device 100 failing due to different expansion amounts when multiple battery cells 11 expand, and improve the reliability and stability of the operation of the battery device 100.

[0139] In some embodiments, please refer to Figures 2-7 , the number of the battery cell assemblies 10 is multiple, and the multiple battery cell assemblies 10 are arranged along the second direction Y, and at least some adjacent two battery cell assemblies 10 are jointly and thermally connected to a limiting section 311.

[0140] As an example, two adjacent battery cell assemblies 10 define that the battery cell assemblies 10 form multiple rows, the limiting section 311 extends along the first direction X to form a straight tube, and two adjacent rows of battery cells 11 can be jointly bonded to the straight tube. When the number of the battery cell assemblies 10 is more than three, the straight tubes can be multiple, and the straight tubes are arranged at intervals along the second direction Y.

[0141] By setting the limiting section 311 and sharing a limiting section 311 between two adjacent battery cell assemblies 10, the constraint on multiple battery cell assemblies 10 can be realized, the stability of the connection between the battery cell assemblies 10 is enhanced, and the overall structure of the battery device 100 is made more firm and reliable; at the same time, sharing a limiting section 311 between two adjacent battery cells 11 can reduce the material usage of the heat exchange tube 31.

[0142] In some embodiments, please refer to Figure 2 and Figure 3, the number of the limiting sections 311 is multiple, the multiple limiting sections 311 are arranged at intervals along the second direction Y, and the end parts of the limiting sections 311 are connected in series with bending sections 312.

[0143] Figure 2 It is illustrated that bending sections 312 are respectively connected in series at both ends of each limiting section 311, and two adjacent bending sections 312 can be directly connected in series or can be connected in series through a straight pipe.

[0144] In some embodiments, please refer to Figure 5 , Figure 6 and Figure 9 , at least one of the bending section 312 and the limiting section 311 is a flat pipe, and the thickness direction of the flat pipe is the same as the height direction Z of the box body 20.

[0145] A straight pipe refers to a pipe extending along a straight line.

[0146] Figure 1 As shown in

[0147] , the number of the straight pipes is multiple, the multiple straight pipes are arranged at intervals along the second direction Y, and bending sections 312 are connected in series between two adjacent straight pipes.

[0148] Compared with the heat exchange pipe 31 being a round pipe, the flat pipe can increase the heat conduction area with the battery cell 11, and on the premise that other heat exchange parameters such as flow rate and flow velocity remain unchanged, the heat exchange efficiency can be improved.

[0149] For the convenience of description in the following embodiments, an electrical device in some embodiments of the present application is taken as an example for description.

[0150] The electrical device includes the battery device 100 of the above embodiment, and the battery device 100 is used to supply electric energy to the electrical device.

[0151] The electrical device can be but is not limited to an electric vehicle, an electric tool, a vehicle 1000, a ship, a spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.

[0152] Figure 10The structure diagram of the electric device in some embodiments of this application shows a vehicle 1000. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range electric vehicle, etc. Inside the vehicle 1000, there is a battery device 100, which can be arranged at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can serve as the operating power source of the vehicle 1000. The vehicle 1000 also includes a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, such as for the working power requirements during the startup, navigation, and driving of the vehicle 1000.

[0153] Since the electric device includes all the technical features of the battery device 100 in the above embodiments, the effects are the same as those described above and will not be elaborated here.

[0154] For the convenience of description in the following embodiments, please refer to Figure 11 and take an energy storage device 2000 in some embodiments of this application as an example for illustration.

[0155] The energy storage device 2000 includes a cabinet 2100 and at least one battery cluster 2200. At least one battery cluster 2200 is accommodated in the cabinet 2100, and the battery cluster 2200 includes a plurality of the battery devices 100 in the above embodiments.

[0156] The energy storage device 2000 includes a cabinet 2100 and a battery cluster 2200. The battery cluster 2200 is accommodated in the cabinet 2100, and the battery cluster 2200 includes a plurality of the battery devices 100 in the above embodiments.

[0157] 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 through a 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.

[0158] The energy storage device 2000 can be used in an energy storage power station, a wind power generation system, a solar power generation system, a mobile power system, or a temporary power supply system, etc. The energy storage device 2000 can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device 2000 can store electrical energy during the low electricity consumption period and provide electrical energy to relevant users or electrical devices during the high electricity consumption period. The energy storage system provided by the embodiments of this application can be any power system that requires the use of the energy storage device 2000.

[0159] Since the energy storage device 2000 includes all the technical features of the battery device 100 of the above embodiment, the effects are the same as those described above and will not be described in detail here.

[0160] In an alternative embodiment of the battery device 100, please refer to Figure 1 , Figures 3-9 The battery device 100 includes a battery cell assembly 10, a box 20 and a thermal management component 30. The battery cell assembly 10 includes a plurality of battery cells 11 arranged along a first direction X. The box 20 includes a first box 21 and a second box 22, which are interlocked and connected with each other. The first box 21 and the second box 22 jointly define a storage space. The battery cell assembly 10 is located in the storage space. The battery cell 11 has a first electrode terminal 1111 and a second electrode terminal 1112 on the side facing the first box 21. The first electrode terminal 1111 and the second electrode terminal 1112 are arranged at intervals along a second direction Y. The first direction X and the second direction Y intersect. The plane where the first direction X and the second direction Y are located intersects with the height direction Z of the box 20. The first direction X intersects with the height direction Z of the box 20. The thermal management component 30 is located on the side of the battery cell assembly 10 facing the first box body 21. The thermal management component 30 includes a heat exchange tube 31. The heat exchange tube 31 includes a bending section 312 and a limiting section 311 extending along the first direction X. At least one end of the limiting section 311 is connected to the bending section 312. The limiting section 311 is thermally connected to multiple battery cells 11. Along the second direction Y, the limiting section 311 is provided on the side of the first electrode terminal 1111 away from the second electrode terminal 1112, and / or, the limiting section 311 is provided on the side of the second electrode terminal 1112 away from the first electrode terminal 1111. The battery cell 11 has a pressure relief mechanism 1113 on the side facing the first box body 21. The pressure relief mechanism 1113 is used to release the gas in the battery cell 11 when the battery cell 11 is thermally runaway. Along the height direction Z of the box body 20, the positive projection of the heat exchange tube 31 on the first box body 21 is located outside the positive projection of the pressure relief mechanism 1113 on the first box body 21. A limiting section 311 is provided between the first electrode terminal 1111 and the pressure relief mechanism 1113, or a limiting section 311 is provided between the second electrode terminal 1112 and the pressure relief mechanism 1113. The heat exchange tube 31 is bonded to the battery cell 11. There are multiple limiting sections 311, and the multiple limiting sections 311 are arranged at intervals along the second direction Y. The ends of the limiting sections 311 are connected in series with a bending section 312. At least one of the bending section 312 and the limiting section 311 is a flat tube, and the thickness direction of the flat tube is the same as the height direction Z of the box body 20.

[0161] The heat exchange tube 31 is arranged in the box body 20 and bonded to the battery cell 11, which can reduce the heat transfer path between the heat exchange tube 31 and the battery cell 11, that is, the heat exchange tube 31 does not exchange heat with the battery cell 11 through the bottom wall of the box body 20, improving the heat exchange efficiency; at the same time, the heat exchange tube 31 is thermally connected to a plurality of battery cells 11, and the trouble of restraining the battery cells 11 by a pressing strip in the traditional way can also be saved, making the structure more compact.

[0162] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some 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 all be covered by the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed 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 plurality of battery cell assemblies, wherein the battery cell assemblies include a plurality of battery cells arranged along a first direction, and the plurality of battery cell assemblies are arranged along a second direction; A box body, comprising a first box body and a second box body, the first box body and the second box body are interlocked and connected to each other, the first box body and the second box body jointly define a storage space, the battery cell assembly is located in the storage space, the battery cell has a first electrode terminal and a second electrode terminal on a side facing the first box body, the first electrode terminal and the second electrode terminal are arranged at intervals along the second direction, the first direction and the second direction intersect, and the plane where the first direction and the second direction are located intersects with the height direction of the box body; a heat management component, located on a side of the battery monomer assembly facing the first box, the heat management component comprising a heat exchange tube, the heat exchange tube comprising a bending section and a limiting section extending along the first direction, at least one end of the limiting section is connected to the bending section, the limiting section is thermally connected to the plurality of battery monomers, and at least part of two adjacent battery monomer assemblies are thermally connected to one limiting section; Along the second direction, the limiting section is provided on a side of the first electrode terminal facing away from the second electrode terminal, and / or the limiting section is provided on a side of the second electrode terminal facing away from the first electrode terminal.

2. The battery device according to claim 1, characterized in that: The limiting section is provided between the first electrode terminal and the second electrode terminal.

3. The battery device according to claim 1, characterized in that: The battery cell has a pressure relief mechanism on one side facing the first box, and the pressure relief mechanism is used to release the gas in the battery cell when the battery cell has thermal runaway. Along the height direction of the box, the orthographic projection of the heat exchange tube on the first box is located outside the orthographic projection of the pressure relief mechanism on the first box.

4. The battery device according to claim 3, characterized in that: The limiting section is provided between the first electrode terminal and the pressure relief mechanism; and / or the limiting section is provided between the second electrode terminal and the pressure relief mechanism.

5. The battery device according to claim 1, characterized in that: A pressure relief mechanism is provided on a side of the battery cell facing away from the first box body, and the pressure relief mechanism is used to release gas in the battery cell when the battery cell has a thermal runaway.

6. The battery device according to any one of claims 1 to 5, characterized in that: The heat exchange tube is bonded to the battery cell.

7. The battery device according to any one of claims 1 to 5, characterized in that: There are multiple limiting segments, and the multiple limiting segments are arranged at intervals along the second direction. The ends of the limiting segments are connected in series with the bending segments.

8. The battery device according to any one of claims 1 to 5, characterized in that: At least one of the bending section and the limiting section is a flat tube, and the thickness direction of the flat tube is the same as the height direction of the box body.

9. An electrical device, characterized in that: It comprises a battery device as described in any one of claims 1 to 8, wherein the battery device is used to provide electrical energy to the electrical device.

10. An energy storage device, characterized in that: The invention comprises a cabinet and at least one battery cluster, wherein the battery cluster is accommodated in the cabinet and comprises a plurality of battery devices according to any one of claims 1 to 8.

Images