Battery device and power utilization device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device, and belongs to the technical field of batteries. The electrode assembly is contained in the shell, and a preset area is arranged on the side, away from the electrode assembly, of the shell and used for being connected with the pressing strip. The coating is located on the outer side of the shell, the coating covers at least part of the preset area, the pressing strip is connected with the coating of the at least two battery monomers in an adhesive mode, and the coating is an insulating coating. The insulating coating covers at least part of the preset area, the possibility that the preset area is exposed is reduced, the insulating coating can insulate at least part of the preset area, the insulating performance of the battery monomer is improved, the possibility that the exposed preset area and a conductive part in the battery device are short-circuited is reduced, and thus the insulating performance of the battery device is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery device and an electrical device. Background Technology

[0002] Batteries are being used more and more widely in daily life and industry. For example, new energy equipment equipped with batteries has been widely used. In addition, batteries are increasingly being used in the field of energy storage.

[0003] In related technologies, battery devices include battery cells and pressure strips, with the pressure strips connected to the battery cells. The insulation performance of the battery devices needs to be improved. Utility Model Content

[0004] This disclosure provides a battery device and an electrical device to improve the insulation performance of the battery device.

[0005] The technical solution of this disclosure embodiment is implemented as follows:

[0006] The first aspect of this disclosure provides a battery device, comprising:

[0007] Pressing strip;

[0008] At least two battery cells, each battery cell including an electrode assembly, a housing, and a coating, the electrode assembly being housed within the housing, the housing having a predetermined area on a side opposite to the electrode assembly, the predetermined area being used to connect a pressure strip, the coating being located on the outside of the housing, the coating covering at least a portion of the predetermined area, the pressure strip being bonded to the coating of at least two of the battery cells, the coating being an insulating coating;

[0009] The housing contains at least two of the battery cells.

[0010] In this embodiment of the disclosure, the coating is an insulating coating that at least partially insulates the preset area. On the one hand, compared with the insulating film in the related art, the connection stability between the coating and the outer shell of the battery cell is higher. The pressure strip is connected to the coating, which helps to reduce the risk of the pressure strip detaching from the battery cell. On the other hand, the insulating coating covers at least part of the preset area, reducing the possibility of the preset area being exposed. The insulating coating can insulate at least part of the preset area, improve the insulation performance of the battery cell, and reduce the possibility of short circuit between the exposed preset area and the conductive components in the battery device, thereby improving the insulation performance of the battery device.

[0011] In some embodiments, all outer surfaces of the housing on the side opposite to the electrode assembly are covered with the insulating coating.

[0012] In this embodiment of the disclosure, the insulating coating can reduce the exposure of the preset area, reduce the problem of reduced electrical clearance caused by the decrease in distance between the preset area and the end of the pressure strip after the battery cell expands, increase the creepage distance between the shell and the end of the pressure strip, and reduce the possibility of short circuit of the battery cell.

[0013] In some embodiments, the coating material is epoxy resin or ceramic.

[0014] In this embodiment of the disclosure, the coating material is epoxy resin or ceramic. Epoxy resin coating has strong adhesion, reducing the possibility of coating peeling off and improving the connection stability between the battery cell and the pressure strip. Ceramic coating has good high temperature resistance, improving the high temperature resistance of the battery cell.

[0015] In some embodiments, the coating is elastic.

[0016] In this embodiment of the disclosure, the coating can absorb and disperse the stress generated by the vibration and expansion of the battery cell, reduce stress concentration, reduce the possibility of fatigue failure of the pressure strip or adhesive, and improve the connection stability between the battery cell and the pressure strip.

[0017] In some embodiments, the thickness of the coating is 0.1 mm to 0.3 mm.

[0018] In this embodiment of the disclosure, the thickness of the coating is within a suitable range. While ensuring the adhesion of the coating, it helps the coating buffer the stress generated by the vibration and expansion of the battery cell, reduces the possibility of fatigue failure of the pressure strip and adhesive, and improves the connection stability between the battery cell and the pressure strip.

[0019] In some embodiments, the coating is a brush coating, a roller coating, a spray coating, a dip coating, or an electrophoretic coating.

[0020] In this embodiment of the disclosure, the coating process is adapted to automated mass production, thereby improving the production efficiency of battery cells.

[0021] In some embodiments, the battery cell further includes an insulating member covering the outside of the housing, the insulating member having a clearance hole, and the preset area being a region on the outer surface of the housing located inside the clearance hole.

[0022] In this embodiment of the disclosure, the contact between the pressure strip and the insulating component is reduced, the pressure strip causes damage to the insulating component, the connection between the pressure strip and the insulating component pulls on the insulating component, and the possibility of the pressure strip causing the insulating component to detach from the outer shell and causing the connection between the pressure strip and the battery cell to fail is reduced, thereby improving the stability of the connection between the pressure strip and the battery cell.

[0023] In some embodiments, the insulating coating is located between the insulating element and the housing, and the insulating coating also partially covers the area on the outer surface of the housing located outside the clearance hole.

[0024] In this embodiment of the disclosure, the insulating coating also covers the area on the outer surface of the housing located outside the clearance hole, which improves the insulation effect, reduces the exposure of the preset area, increases the creepage distance between the housing and the end of the pressure strip, and reduces the possibility of short circuit of the battery cell.

[0025] In some embodiments, the battery cell includes an electrode terminal electrically connected to the electrode assembly, the housing includes a first wall, the electrode terminal is mounted on the first wall, the first wall has the preset area, the insulating member includes a first insulating member and a second insulating member, the first insulating member covers the side of the first wall away from the electrode assembly, the second insulating member covers the other housing walls of the housing except the first wall, and the first insulating member and the second insulating member surround the clearance hole.

[0026] In this embodiment, the second insulating member does not need to cover the first wall, reducing the flange of the second insulating member and facilitating its processing.

[0027] In some embodiments, the battery cell includes an electrode terminal electrically connected to the electrode assembly, the housing includes a first wall, the electrode terminal is mounted on the first wall, the first wall has the preset area, the insulating member includes a first insulating member and a second insulating member, the first insulating member covers the side of the first wall away from the electrode assembly, the second insulating member covers the first wall and other housing walls on the housing other than the first wall, and the first insulating member and the second insulating member surround the clearance hole.

[0028] In this embodiment of the disclosure, the second insulating element covers the first wall and other shell walls on the outer casing, except for the first wall. While meeting the insulation requirements of the outer casing, the coverage area of ​​the coating can be reduced, and the amount of coating used on the battery cell can be reduced.

[0029] In some embodiments, the battery cell includes at least two electrode terminals electrically connected to the electrode assembly, the at least two electrode terminals being arranged along a predetermined direction, the housing including a first wall, the electrode terminals being mounted on the first wall, the first wall having a predetermined region, the predetermined region of the first wall being located on the side of one electrode terminal facing away from the other electrode terminal along the predetermined direction.

[0030] In this embodiment, the preset area is closer to the electrode terminal, which makes the pressure strip closer to the electrode terminal. This helps to reduce the loosening of the connection between the electrode terminal and the busbar caused by the expansion of the battery cell, improves the structural strength of the connection between the electrode terminal and the housing, and improves the stability of the battery cell.

[0031] In some embodiments, the pressure strip includes a metal strip and an insulating layer, the insulating layer covering the surface of the metal strip and being bonded to the coating.

[0032] In this embodiment, the insulating layer insulates the metal strip, and the insulating coating insulates the battery cell, further improving the insulation performance between the pressure strip and the battery cell, and improving the insulation performance of the battery device.

[0033] In some embodiments, the battery cell includes an electrode terminal electrically connected to the electrode assembly, the electrode terminal being located on the underside of the battery cell, and the pressure strip being at least partially located at the bottom of the battery cell.

[0034] In this embodiment, the pressure strip is firmly connected to the coating and the battery cell. When the battery device is inverted, the pressure strip helps to share the load of the battery cell and reduces the possibility of the battery cell falling off the casing.

[0035] A second aspect of this disclosure provides an electrical device, including the battery device described above.

[0036] In this embodiment, on the one hand, compared with the insulating film in the related art, the connection stability between the coating and the outer shell of the battery cell is higher. The pressure strip is connected to the coating, which helps to reduce the risk of the pressure strip and the battery cell becoming detached. On the other hand, the insulating coating covers at least part of the preset area, reducing the possibility of the preset area being exposed. The insulating coating can insulate at least part of the preset area, improve the insulation performance of the battery cell, and reduce the possibility of short circuit between the exposed preset area and the conductive components in the battery device, thereby improving the insulation performance of the battery device. Attached Figure Description

[0037] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0038] Figure 1 This is a schematic diagram of the structure of the electrical device provided in the embodiments of this disclosure;

[0039] Figure 2 This is an exploded schematic diagram of the battery device provided in the embodiments of this disclosure;

[0040] Figure 3 This is a schematic diagram of the structure of a single battery cell provided in an embodiment of this disclosure;

[0041] Figure 4This is a schematic diagram of the assembly structure of the pressure strip and the battery cell provided in the embodiments of this disclosure;

[0042] Figure 5 yes Figure 4 Enlarged view of point A;

[0043] Figure 6 yes Figure 4 Sectional view at point BB.

[0044] Explanation of reference numerals in the attached figures

[0045] 1. Electrode assembly; 2. Housing; 21. Preset area; 22. First wall; 23. Second wall; 24. Third wall; 3. Coating; 4. Insulating component; 41. First insulating component; 42. Second insulating component; 43. Clearance hole; 5. Electrode terminal; 10. Battery cell; 20. Pressure strip; 1000. Vehicle; 100. Battery device; 200. Controller; 300. Motor; 400. Housing; 401. First housing; 402. Second housing. Detailed Implementation

[0046] The embodiments of the technical solutions of this disclosure will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solutions of the embodiments of this disclosure, and are therefore merely examples and should not be used to limit the scope of protection of this application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of this disclosure belong; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having” and any variations thereof in this disclosure are intended to cover non-exclusive inclusion.

[0048] In the description of the embodiments of this disclosure, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "multiple" means two or more, unless otherwise explicitly defined. "Two or more" here includes the case of two.

[0049] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0050] In the description of the embodiments of this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0051] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0052] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0053] In related technologies, a battery device includes at least two battery cells and a retaining strip. The retaining strip is connected to the outer casing of at least two battery cells and is used to constrain the expansion, deformation, and displacement of the battery cells. The outer surface of the battery cells is typically covered with an insulating film to provide insulation protection. Since the insulating film is usually formed by bonding parts of itself to other parts to create a containment structure covering the battery cells, it is prone to detaching from the battery cells under external forces. Therefore, if the retaining strip is bonded to the insulating film, it is easy for the retaining strip to detach from the battery cells when they expand. Currently, the common practice is to create a window in the insulating film, exposing the surface of the battery cell's outer casing. The retaining strip is then directly bonded to the outer casing of the battery cell at the window, thereby improving the connection stability between the retaining strip and the battery cell. However, the presence of the window exposes part of the battery cell's outer casing, and due to manufacturing tolerances, the retaining strip cannot completely cover the window, resulting in a weakening of the insulating film's insulation protection capability for the battery cells.

[0054] In the battery device 100 of this embodiment, a preset area 21 of a battery cell 10 is used to connect a pressure strip 20. A coating 3 is located on the outside of the housing 2, and the coating 3 covers at least a portion of the preset area 21. The pressure strip 20 is bonded to the coating 3 of at least two battery cells 10. The coating 3 is an insulating coating. On the one hand, compared with the insulating film in the related art, the connection stability between the coating 3 and the housing 2 of the battery cell 10 is higher. The pressure strip 20 is connected to the coating 3, which helps to reduce the risk of the pressure strip 20 detaching from the battery cell 10. On the other hand, the insulating coating covers at least a portion of the preset area 21, reducing the possibility of the preset area 21 being exposed and reducing the possibility of short circuit between the exposed preset area 21 and the conductive components in the battery device 100, thereby improving the insulation performance of the battery device 100.

[0055] This disclosure provides an electrical device including a battery device 100, which is used to store or provide electrical energy.

[0056] In some embodiments, please refer to Figure 1 The electrical device also includes a main body, and a battery device 100 is installed on the main body to supply power to the main body.

[0057] Electrical devices are devices that use electrical energy as their energy source to perform corresponding functions by consuming electrical energy. For example, electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0058] The main body of a device refers to the main structure that consumes electrical energy to perform its corresponding functions. For example, an electrical device can be a mobile phone, where the main body is the part that enables communication and other functions, powered by individual battery cells or battery packs. Similarly, an electrical device can be a car, where the main body is the part that provides seating and allows the vehicle to move on the road, powered by individual battery cells or battery packs.

[0059] The following description will be based on an example of an electrical device, namely a vehicle 1000, according to an embodiment of this disclosure.

[0060] The vehicle 1000 provided in this embodiment can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Please refer to... Figure 1The vehicle 1000 has a battery device 100 installed inside, which 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, it can serve as the vehicle 1000's operating power source. The vehicle 1000 may also include a controller 200 and a motor 300, whereby the controller 200 can control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can meet the power needs of the vehicle 1000 during startup, navigation, and operation.

[0061] In this embodiment of the disclosure, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0062] In some embodiments, the battery device 100 may be a battery pack.

[0063] In some embodiments, the battery device 100 may be an energy storage device.

[0064] The battery device 100 of this disclosure includes a battery cell assembly, which includes battery cells. Electrical energy is stored or supplied through the battery cells.

[0065] The battery device 100 corresponds to one or at least two battery cell assemblies, which are used to provide voltage and capacity. A battery cell assembly may include at least two battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0066] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0067] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0068] In this embodiment of the disclosure, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0069] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments disclosed herein are not limited to this.

[0070] A single battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrodes. During the charging and discharging process of the battery cell, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing active ions to pass through. In some embodiments, the positive electrode can be a positive electrode sheet, which 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.

[0071] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0072] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0073] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, the embodiments of this disclosure are 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. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide 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, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0074] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0075] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0076] 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.

[0077] As an example, the negative electrode current collector has two surfaces opposite 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.

[0078] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. 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, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the embodiments of this disclosure are not limited to these materials, and other conventional 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.

[0079] In some embodiments, the negative electrode can be made of foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or a foamed alloy, etc. When foamed metal is used as the negative electrode, the surface of the foamed metal may or may not contain a negative electrode active material.

[0080] In some embodiments, the negative electrode may be made of foamed carbon.

[0081] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0082] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0083] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0084] In some implementations, the spacer is a spacer membrane.

[0085] This disclosure does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0086] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0087] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0088] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This disclosure does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0089] Liquid electrolytes include electrolyte salts and solvents.

[0090] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0091] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0092] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and 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.

[0093] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0094] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0095] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0096] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0097] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0098] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0099] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0100] In some implementations, the electrode assembly is a stacked structure.

[0101] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0102] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0103] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0104] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0105] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0106] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0107] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

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

[0109] For the battery cell 10 of this embodiment, please refer to [link / reference]. Figures 2-6The battery device 100 includes a housing 400, a pressure strip 20, and at least two battery cells 10. Each battery cell 10 includes an electrode assembly 1, a housing 2, and a coating 3. The electrode assembly 1 is housed within the housing 2. The housing 2 has a preset area 21 on the side opposite to the electrode assembly 1. The preset area 21 is used to connect the pressure strip 20. The coating 3 is located on the outside of the housing 2 and covers at least a portion of the preset area 21. The pressure strip 20 is bonded to the coating 3 of the at least two battery cells 10. The coating 3 is an insulating coating. The at least two battery cells 10 are located within the housing 400.

[0110] The pressure strip 20 is a structure used to fix and / or constrain the battery cell 10.

[0111] For example, the outer casing 2 can be a steel casing, an aluminum casing, a plastic casing (polypropylene), a composite metal casing (such as a copper-aluminum composite casing 2), or an aluminum-plastic film, etc.

[0112] Exemplarily, the outer casing 2 can be a sealed structure or a non-sealed structure. As an example, when the outer casing 2 is a non-sealed structure, it serves to protect the electrode assembly 1, and a sealing bag is included between the outer casing 2 and the electrode assembly 1. The sealing bag is used to encapsulate the electrode assembly 1 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component 4 or an aluminum-plastic film. When the outer casing 2 is a sealed structure, it is used to encapsulate the electrode assembly 1 and the electrolyte, among other components.

[0113] For example, the battery cell 10 is a prismatic battery.

[0114] For example, the battery cell 10 is a blade battery.

[0115] For example, housing 2 includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also be provided one or more.

[0116] For example, the connection between the pressure strip 20 and the preset area 21 of the housing 2 can be a partial direct connection or an indirect connection.

[0117] For example, coating 3 covers a portion of the preset area 21.

[0118] For example, coating 3 completely covers the preset area 21.

[0119] For example, at least two battery cell assemblies are arranged in a predetermined direction.

[0120] For example, the housing 400 may be part of the chassis structure of the vehicle 1000. For instance, a portion of the housing 400 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 400 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0121] For example, please refer to Figure 2 The housing 400 may include a first housing 401 and a second housing 402. The first housing 401 and the second housing 402 are fastened together to form a closed space inside the housing 400 to house the battery cells 10. Here, "closed" refers to covering or closing, which can be sealed or not sealed. The first housing 401 may be a top cover or a bottom plate.

[0122] For example, at least two battery cells 10 are arranged in a set direction to form a battery cell assembly, the set direction intersects with the large surface of the battery cell 10, and the pressure strip 20 is connected to the coating 3 of the at least two adjacent battery cells 10 along the set direction.

[0123] Set direction as follows Figure 4 The direction shown in R2.

[0124] It should be noted that the preset direction intersects with the set direction.

[0125] For example, the orientation is set perpendicular to the large surface of the battery cell 10.

[0126] It should be noted that "large surface" refers to the surface with the largest area among the outer surfaces of the battery cell 10.

[0127] The electrode assembly 1 includes a positive electrode, a negative electrode, and a separator. The separator is located between the positive electrode and the negative electrode. The electrode assembly 1 includes a flat region, and the portions of the positive electrode and the negative electrode in the flat region are arranged along a predetermined direction.

[0128] For example, the number of battery cell components is at least two.

[0129] For example, the battery cell 10 is bonded to the housing 400.

[0130] For example, the pressure strip 20 is connected to the housing 400.

[0131] An insulating coating is a coating applied to the surface of electrical equipment or materials to provide electrical insulation protection and prevent current leakage, short circuits, or arcing.

[0132] For example, the insulating coating is an inorganic insulating coating mainly composed of inorganic compounds such as aluminum oxide, aluminum silicate, and magnesium oxide.

[0133] For example, the insulating coating is an organic insulating coating composed of organic polymer compounds such as polyethylene, polypropylene, and polyimide.

[0134] For example, the insulating coating is a composite insulating coating that combines inorganic and organic materials.

[0135] For example, the adhesive between the pressure strip 20 and the battery cell 10 is an insulating adhesive.

[0136] For example, the pressure strip 20 is at least partially conductive.

[0137] For example, coating 3 is applied to the outer side of housing 2.

[0138] For example, coating 3 is applied to at least a portion of the preset area 21.

[0139] In this embodiment, the preset area 21 is used to connect the pressure strip 20. The coating 3 is located on the outside of the outer shell 2, and the coating 3 covers at least a portion of the preset area 21. The pressure strip 20 is bonded to the coating 3 of at least two battery cells 10. The coating 3 is an insulating coating, and the insulating coating covers at least a portion of the preset area 21, reducing the possibility of the preset area 21 being exposed. The insulating coating can insulate at least a portion of the preset area 21, improving the insulation performance of the battery cells 10 and reducing the possibility of short circuits between the exposed preset area 21 and conductive components within the battery device 100, thereby improving the insulation performance of the battery device 100. The insulating coating covering at least a portion of the preset area 21 reduces the possibility of the preset area 21 being exposed. The insulating coating on the preset area 21 increases the electrical clearance between the pressure strip 20 and the outer shell 2, reducing the possibility of short circuits between the preset area 21 and the pressure strip 20, and improving the insulation performance of the battery device 100.

[0140] The pressure strip 20 is bonded to the insulating coating of at least two battery cells 10. The insulating coating material has a strong adhesion to the adhesive, and the surface of the coating 3 does not contain a release agent, which enhances the adhesion of the adhesive to the battery cells 10 and reduces the possibility of the adhesive detaching from the outer casing 2. Compared with the insulating film in related technologies, the connection stability between the coating 3 and the outer casing 2 of the battery cells 10 is higher, which helps to reduce the risk of the pressure strip 20 detaching from the battery cells 10 and improves the stability of the connection between the pressure strip 20 and the battery cells 10. The coating 3 can fill any pits that may exist in the preset area 21, increasing the contact area between the pressure strip 20 and the coating 3, resulting in more sufficient contact between the pressure strip 20 and the coating 3 and improving the stability of the connection between the pressure strip 20 and the battery cells 10. The adhesive layer can absorb and attenuate vibration impact energy, reduce the mechanical stress transmitted to the inside of the battery cells 10, protect the internal structures of the battery cells 10 such as the tabs and welding points, and improve the reliability and lifespan of the battery device 100 under vibration conditions.

[0141] In some embodiments, all outer surfaces of the housing 2 on the side opposite to the electrode assembly 1 are covered with an insulating coating.

[0142] For example, the housing 2 includes an end cap and a housing, the electrode assembly 1 is located in the space enclosed by the end cap and the housing, the outer surface of the end cap opposite to the electrode assembly 1 is covered with an insulating coating, and the outer surface of the housing opposite to the electrode assembly 1 is covered with an insulating coating.

[0143] In this embodiment, all outer surfaces of the housing 2 on the side facing away from the electrode assembly 1 are covered with an insulating coating, improving the insulation performance of the housing 2. The insulating coating reduces the exposure of the preset area 21, mitigating the problem of reduced electrical clearance caused by the decreased distance between the preset area 21 and the end of the pressure strip 20 after the battery cell 10 expands. It also increases the creepage distance between the housing 2 and the end of the pressure strip 20, reducing the possibility of short circuits in the battery cell 10. The boundary and thickness of the insulating coating are easy to control, allowing for control of the insulation boundary and thickness of the preset area 21 as needed, reducing insulation uncertainties caused by uneven adhesive application or excess adhesive. Since all outer surfaces of the housing 2 on the side facing away from the electrode assembly 1 are covered with an insulating coating, no other insulating materials need to be provided on the housing 2, reducing the types of insulating materials on the housing 2 and reducing the processing steps of the battery cell 10.

[0144] It is understood that, not limited to, all outer surfaces of the housing 2 facing away from the electrode assembly 1 are covered with an insulating coating. For example, the outer surface of the end cap facing away from the electrode assembly 1 is covered with an insulating coating, and the outer surface of the housing facing away from the electrode assembly 1 is wrapped with an insulating blue film.

[0145] In some embodiments, the material of coating 3 is epoxy resin or ceramic.

[0146] Epoxy resins are a class of high molecular weight polymers containing two or more epoxy groups in their molecules, with a backbone structure of aliphatic, alicyclic, or aromatic organic compounds.

[0147] In this embodiment, the coating 3 is made of epoxy resin. The epoxy resin coating 3 has strong adhesion, reducing the possibility of coating 3 peeling off and improving the connection stability between the battery cell 10 and the pressure strip 20. The epoxy resin coating 3 also has good film-forming properties, facilitating overall coverage of the outer casing 2. Alternatively, the coating 3 may be made of ceramic. The ceramic coating 3 has good high-temperature resistance, improving the high-temperature resistance of the battery cell 10, and also has good flame-retardant properties, reducing the possibility of the battery cell 10 catching fire.

[0148] It is understood that the material of coating 3 is not limited to epoxy resin or ceramic. For example, the material of coating 3 is polyurethane coating 3.

[0149] In some embodiments, coating 3 is elastic.

[0150] For example, coating 3 is an elastic epoxy coating 3.

[0151] For example, coating 3 is a polyurethane elastic coating 3, a polyurethane acrylate elastic coating 3, or a silicone rubber elastic coating 3.

[0152] In this embodiment, the coating 3 is elastic and can absorb and disperse the stress generated by the vibration and expansion of the battery cell 10, reduce the cracking of the coating 3, reduce stress concentration, reduce the possibility of fatigue failure of the pressure strip 20 or adhesive, and improve the connection stability between the battery cell 10 and the pressure strip 20.

[0153] It is understood that coating 3 is not limited to being elastic. For example, coating 3 is a rigid coating 3.

[0154] In some embodiments, the material of coating 3 is an elastic coating.

[0155] Elastic coatings are functional coatings made from synthetic resin emulsions as a base, combined with pigments, fillers, and additives.

[0156] For example, the elastic coating is an acrylic elastic coating or a polyvinyl chloride elastic coating.

[0157] In some embodiments, please refer to Figures 3-6 The thickness of coating 3 is 0.1mm~0.3mm.

[0158] The thickness of coating 3 can be measured by calipers or ruler under normal temperature and pressure conditions when the battery cell 10 is not in operation and is powered off.

[0159] For example, the thickness of coating 3 is 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm or 0.3 mm.

[0160] The thickness of coating 3 is as follows Figure 6 The dimension is indicated by H1.

[0161] In this embodiment of the disclosure, the thickness of the coating 3 is 0.1mm to 0.3mm. The thickness of the coating 3 is within a suitable range. While satisfying the adhesion of the coating 3, it is beneficial for the coating 3 to buffer the stress generated by the vibration and expansion of the battery cell 10, reduce stress concentration, reduce the possibility of fatigue failure of the pressure strip 20 and the adhesive, and improve the connection stability between the battery cell 10 and the pressure strip 20.

[0162] It is understandable that the thickness of coating 3 is not limited to 0.1mm~0.3mm.

[0163] For example, the thickness of coating 3 is less than 0.1 mm.

[0164] For example, the thickness of coating 3 is greater than 0.3 mm.

[0165] In some embodiments, coating 3 is a brush coating, roller coating, spray coating, dip coating, or electrophoretic coating.

[0166] For example, the epoxy resin coating 3 is suitable for spraying or dipping.

[0167] For example, ceramic coating 3 is suitable for plasma spraying.

[0168] In this embodiment, coating 3 is a brush coating, roller coating, spray coating, dip coating, or electrophoretic coating 3, with a process adapted to automated mass production, improving the production efficiency of battery cells 10. Spray coating 3 allows for more precise control of the coating particle size, enabling better adhesion of coating 3 to the outer shell 2 and a strong bond between coating 3 and the outer shell 2. Spray coating also improves the uniformity of coating thickness, enhances the consistency of coating 3, facilitates quality control of coating 3, and enables automated and precise production.

[0169] It is understood that coating 3 is not limited to brush coating, roller coating, spray coating, dip coating, or electrophoretic coating. For example, coating 3 is a curtain coating or a UV-cured coating.

[0170] In some embodiments, please refer to Figures 3-6 The battery cell 10 also includes an insulating member 4 covering the outside of the housing 2. The insulating member 4 has a clearance hole 43. The preset area 21 is the area on the outer surface of the housing 2 located inside the clearance hole 43.

[0171] For example, the clearance hole 43 is used to avoid the pressure strip 20.

[0172] It should be noted that the inner side of the clearance hole 43 refers to the inner side of the hole wall surface of the clearance hole 43.

[0173] It should be noted that the preset area 21, which is the area on the outer surface of the housing 2 located inside the clearance hole 43, means that when projected along the axial direction of the clearance hole 43, the projection area of ​​the preset area 21 completely coincides with the projection area of ​​the clearance hole 43.

[0174] It should be noted that the adhesive force between the coating 3 and the outer shell 2 is greater than the adhesive force between the insulating component 4 and the outer shell 2.

[0175] For example, the insulating element 4 and the coating 3 together cover all the outer surfaces of the housing 2.

[0176] In this embodiment, the insulating member 4 has a clearance hole 43. The preset area 21 is the area on the outer surface of the outer shell 2 located inside the clearance hole 43. This reduces the contact between the pressure strip 20 and the insulating member 4, reduces the pressure strip 20 causing damage to the insulating member 4, reduces the pressure strip 20 pulling on the insulating member 4 during connection, reduces the possibility of the pressure strip 20 causing the insulating member 4 to detach from the outer shell 2, resulting in the failure of the connection between the pressure strip 20 and the battery cell 10, and improves the connection stability between the pressure strip 20 and the battery cell 10.

[0177] It is understood that the preset area 21 is not limited to the area on the outer surface of the housing 2 located inside the clearance hole 43. Exemplarily, the preset area 21 includes the area on the outer surface of the housing 2 located inside the clearance hole 43 and a portion of the outer surface of the housing 2 located outside the clearance hole 43.

[0178] In some embodiments, please refer to Figures 3-6 The insulating coating is located between the insulating component 4 and the housing 2, and the insulating coating also covers the area on the outer surface of the housing 2 located outside the clearance hole 43.

[0179] It should be noted that the insulating coating also covers the area on the outer surface of the housing 2 located outside the clearance hole 43. This means that in addition to covering the preset area 21 located inside the clearance hole 43, the insulating coating also covers the area located outside the clearance hole 43. When projected along the axial direction of the clearance hole 43, the projection area of ​​the clearance hole 43 is located within the projection area of ​​the insulating coating.

[0180] In this embodiment, the insulating coating is located between the insulating component 4 and the outer shell 2. The insulating coating also covers the area on the outer surface of the outer shell 2 located outside the clearance hole 43, thereby improving the insulation effect. The insulating coating also covers the area on the outer surface of the outer shell 2 located outside the clearance hole 43, thereby reducing the boundary of the insulating coating being restricted by the boundary of the clearance hole 43. This facilitates the processing of the insulating coating on the outer shell 2 and improves the production efficiency of the battery cell 10.

[0181] The area on the outer casing 2 other than the preset area 21 is covered by the insulating component 4. The insulating coating completely covers the preset area 21, and there is an overlapping area between the insulating coating and the insulating component 4. This reduces the possibility of the preset area 21 being exposed, reduces the problem of the preset area 21 being exposed and causing a reduction in the electrical clearance between the preset area 21 and the end of the pressure strip 20, increases the creepage distance between the outer casing 2 and the end of the pressure strip 20, and reduces the possibility of short circuit of the battery cell 10.

[0182] It is understood that the insulating coating is not limited to partially covering the area on the outer surface of the housing 2 located outside the clearance hole 43. Exemplarily, when projected along the axial direction of the clearance hole 43, the projected area of ​​the preset area 21 completely coincides with the projected area of ​​the clearance hole 43.

[0183] In some embodiments, please refer to Figures 4-6The battery cell 10 includes an electrode terminal 5 electrically connected to the electrode assembly 1. The housing 2 includes a first wall 22, the electrode terminal 5 is mounted on the first wall 22, and a preset area 21 is provided on the first wall 22. The insulating member 4 includes a first insulating member 41 and a second insulating member 42. The first insulating member 41 covers the side of the first wall 22 away from the electrode assembly 1, and the second insulating member 42 covers the other housing walls of the housing 2 except for the first wall 22. The first insulating member 41 and the second insulating member 42 are arranged to form a clearance hole 43.

[0184] It should be noted that when the second insulating element 42 covers the other shell walls of the outer casing 2 besides the first wall 22, it means that the second insulating element 42 covers the side of the other shell walls of the outer casing 2 away from the electrode assembly 1.

[0185] It should be noted that the side away from electrode assembly 1 refers to the side that is away from electrode assembly 1 along the thickness direction of the shell wall.

[0186] For example, the first wall 22 is an end cap.

[0187] For example, the first insulating element 41 is an insulating patch.

[0188] For example, the second insulating element 42 is an insulating blue film.

[0189] For example, the first insulating member 41 covers the side of the end cap that is away from the electrode assembly 1.

[0190] For example, the second insulating member 42 covers the side of the housing opposite to the electrode assembly 1.

[0191] In this embodiment, the first insulating member 41 covers the side of the first wall 22 facing away from the electrode assembly 1, and the second insulating member 42 covers the other shell walls of the outer casing 2 except for the first wall 22. The first insulating member 41 and the second insulating member 42 are arranged to form a clearance hole 43. The second insulating member 42 does not need to cover the first wall 22, reducing the flange of the second insulating member 42 and facilitating its processing. The fact that the second insulating member 42 does not need to cover the first wall 22 reduces the possibility of contact between the pressure strip 20 connected to the preset area 21 and the second insulating member 42, thus reducing interference between the pressure strip 20 and the second insulating member 42.

[0192] In some embodiments, a preset area 21 is provided on the first wall 22, the preset area 21 is covered with an insulating coating, the first insulating member 41 covers the other areas of the first wall 22 away from the electrode assembly 1 except for the preset area 21, the outer surfaces of the outer shell 2 other than the first wall 22 are also covered with an insulating coating, and the battery cell 10 is not provided with a second insulating member 42.

[0193] For example, the insulating coating is located between the first insulating member 41 and the housing 2, and on the first wall 22, the area covered by the insulating coating is partially located within the area covered by the first insulating member 41.

[0194] In some embodiments, please refer to Figures 3-6 The first wall 22 is an end cap, and the housing includes a second wall 23 and a third wall 24. The second wall 23 and the end cap are arranged opposite to each other, and the third wall 24 surrounds the second wall 23. The third wall 24 is connected to the second wall 23 and the first wall 22 respectively.

[0195] For example, the second insulating member 42 covers the side of the second wall 23 facing away from the electrode assembly 1 and the side of the third wall 24 facing away from the electrode assembly 1.

[0196] For example, the second insulating member 42 covers the side of the second wall 23 facing away from the electrode assembly 1, and the coating 3 covers the side of the third wall 24 facing away from the electrode assembly 1.

[0197] For example, coating 3 covers the side of the second wall 23 facing away from the electrode assembly 1 and the side of the third wall 24 facing away from the electrode assembly 1.

[0198] For example, the preset area 21 is located on the third wall 24.

[0199] For example, the preset area 21 is located on the second wall 23.

[0200] In some embodiments, please refer to Figure 3 The battery cell 10 includes an electrode terminal 5 electrically connected to the electrode assembly 1. The housing 2 includes a first wall 22, the electrode terminal 5 is mounted on the first wall 22, and a preset area 21 is provided on the first wall 22. The insulating member 4 includes a first insulating member 41 and a second insulating member 42. The first insulating member 41 covers the side of the first wall 22 away from the electrode assembly 1, and the second insulating member 42 covers the first wall 22 and other housing walls of the housing 2 except for the first wall 22. The first insulating member 41 and the second insulating member 42 are arranged to form a clearance hole 43.

[0201] For example, the first insulating member 41 covers a portion of the end cap on the side opposite to the electrode assembly 1.

[0202] For example, the second insulating member 42 covers a portion of the end cap on the side opposite to the electrode assembly 1.

[0203] For example, the second insulating member 42 covers the entire area of ​​the housing on the side opposite to the electrode assembly 1.

[0204] For example, the electrode terminal 5 penetrates the first insulating member 41.

[0205] In this embodiment, the first insulating member 41 covers the side of the first wall 22 facing away from the electrode assembly 1, and the second insulating member 42 covers the first wall 22 and other shell walls on the outer casing 2 except for the first wall 22. The area on the first wall 22 other than the preset area 21 is insulated by the first insulating member 41 and the second insulating member 42. While meeting the insulation requirements of the outer casing 2, the coverage area of ​​the coating 3 can be reduced, and the amount of coating 3 used on the battery cell 10 can be reduced.

[0206] In some embodiments, please refer to Figures 3-6 The battery cell 10 includes at least two electrode terminals 5 electrically connected to the electrode assembly 1. The at least two electrode terminals 5 are arranged in a preset direction. The housing 2 includes a first wall 22. The electrode terminals 5 are mounted on the first wall 22. A preset area 21 is provided on the first wall 22. The preset area 21 of the first wall 22 is located on the side of one of the electrode terminals 5 that is away from the other electrode terminal 5 in a preset direction.

[0207] Preset direction such as Figure 4 and Figure 6 The direction indicated by R1.

[0208] For example, the first wall 22 is an end cap.

[0209] For example, the battery cell 10 includes a pressure relief mechanism mounted on the first wall 22.

[0210] For example, the pressure relief mechanism is located between two adjacent electrode terminals 5 of the battery cell 10 in a preset direction.

[0211] For example, at least one of the electrode terminals 5 is a positive electrode and at least one of the electrode terminals 5 is a negative electrode.

[0212] In this embodiment, a preset area 21 is provided on the first wall 22. The preset area 21 is close to the electrode terminal 5, which makes the pressure strip 20 close to the electrode terminal 5. This helps to reduce the loosening of the connection between the electrode terminal 5 and the busbar caused by the expansion of the battery cell 10, improves the structural strength of the connection between the electrode terminal 5 and the housing, and improves the stability of the battery cell 10. The preset area 21 of the first wall 22 is located on the side of one electrode terminal 5 away from the other electrode terminal 5 along a preset direction, reducing the space occupied by the pressure strip 20 between two adjacent electrode terminals 5.

[0213] It is understood that the preset area 21 is not limited to being provided on the first wall 22. Exemplarily, the preset area 21 is located on other shell walls of the outer shell 2 besides the first wall 22.

[0214] For example, the preset area 21 is located on the shell walls of the outer shell 2 on opposite sides along a preset direction.

[0215] In some embodiments, the battery cell 10 includes an electrode terminal 5 electrically connected to the electrode assembly 1, the electrode terminal 5 being located on the underside of the battery cell 10, and the pressure strip 20 being located at least partially at the bottom of the battery cell 10.

[0216] It should be noted that when the battery device 100 is inverted, the electrode terminal 5 is located on the lower side of the battery cell 10.

[0217] In this embodiment, the battery cell 10 includes an electrode terminal 5 electrically connected to the electrode assembly 1. The electrode terminal 5 is located on the lower side of the battery cell 10. The pressure strip 20 is at least partially located at the bottom of the battery cell 10. The pressure strip 20 is firmly connected to the coating 3 and the battery cell 10. When the battery device 100 is inverted, the pressure strip 20 helps to share the load of the battery cell 10 and reduces the possibility of the battery cell 10 falling off the housing 400.

[0218] It is understood that the electrode terminal 5 is not limited to being located on the lower side of the battery cell 10. Exemplarily, the electrode terminal 5 is located on the upper side of the battery cell 10.

[0219] In some embodiments, the pressure strip 20 includes a metal strip and an insulating layer, the insulating layer covering the surface of the metal strip and being bonded to the coating 3.

[0220] For example, the insulating layer of the pressure strip 20 is at least partially located between the metal strip and the coating 3.

[0221] In this embodiment, an insulating layer covers the surface of a metal strip, the insulating layer insulates the metal strip, the insulating coating insulates the battery cell 10, and the insulating layer is bonded to the coating 3, increasing the insulation thickness between the metal strip and the battery cell 10, further improving the insulation performance between the pressure strip 20 and the battery cell 10, and improving the insulation performance of the battery device 100.

[0222] In some embodiments, the step of spraying a coating onto the outer casing 2 of the battery cell 10 is as follows:

[0223] Step 1 Surface treatment: Use a plasma cleaner to clean and activate the preset area 21 of the housing 2 to remove oil stains and improve the surface cleanliness of the housing 2.

[0224] Step 2 Spraying: Using automated spraying equipment, epoxy resin powder is evenly sprayed onto the treated area to a target thickness of 0.2mm to form a spray coating.

[0225] Step 3 Curing: The sprayed outer shell 2 is placed into a curing oven and cured at 150°C for 30 minutes to allow the epoxy resin coating 3 to fully cross-link and cure, and to firmly bond with the substrate of the outer shell 2.

[0226] Step 4: Install the pressure strip 20: Apply structural adhesive to the pressure strip 20 and then press it firmly onto the sprayed area of ​​the outer shell 2. After the structural adhesive cures, a high-strength connection is achieved between the pressure strip 20 and the coating 3 through the interlocking action of the structural adhesive and mechanical interlocking.

[0227] In some embodiments, please refer to Figures 4-6 The battery device 100 includes a housing 400, a pressure strip 20, and at least two battery cells 10. Each battery cell 10 includes an electrode assembly 1, a housing 2, and a coating 3. The electrode assembly 1 is housed within the housing 2. The housing 2 has a predetermined area 21 on the side opposite to the electrode assembly 1, which is used to connect the pressure strip 20. The coating 3 is located on the outside of the housing 2, covering at least a portion of the predetermined area 21. The at least two battery cells 10 are located within the housing 400. The pressure strip 20 is bonded to the coating 3 of the at least two battery cells 10. The coating 3 is an insulating coating made of epoxy resin, has elasticity, and a thickness of 0.2 mm. The coating 3 is a sprayed coating. The insulating coating is located between an insulating component 4 and the housing 2. The housing 2 includes a first wall 22, on which the predetermined area 21 is provided. The insulating component 4 includes a first... The first insulating element 41 covers the side of the first wall 22 away from the electrode assembly 1, and the second insulating element 42 covers the other shell walls of the outer shell 2 except for the first wall 22. The first insulating element 41 and the second insulating element 42 are arranged to form a clearance hole 43. The insulating coating partially covers the area on the outer surface of the outer shell 2 located outside the clearance hole 43. The battery cell 10 includes at least two electrode terminals 5 electrically connected to the electrode assembly 1. The at least two electrode terminals 5 are arranged in a preset direction. The electrode terminals 5 are mounted on the first wall 22. A preset area 21 is provided on the first wall 22. The preset area 21 of the first wall 22 is located on the side of one electrode terminal 5 away from the other electrode terminal 5 in a preset direction. The pressure strip 20 includes a metal strip and an insulating layer. The insulating layer covers the surface of the metal strip and is bonded to the coating 3.

[0228] The above embodiments are merely illustrative of the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way.

Claims

1. A battery device, characterized in that, include: Pressing strip; At least two battery cells, each battery cell including an electrode assembly, a housing, and a coating, the electrode assembly being housed within the housing, the housing having a predetermined area on a side opposite to the electrode assembly, the predetermined area being used to connect the pressure strip, the coating being located on the outside of the housing, the coating covering at least a portion of the predetermined area, the pressure strip being bonded to the coating of at least two of the battery cells, the coating being an insulating coating; The housing contains at least two of the battery cells.

2. The battery device according to claim 1, characterized in that, All outer surfaces of the housing on the side opposite to the electrode assembly are covered with the insulating coating.

3. The battery device according to claim 1 or 2, characterized in that, The coating material is epoxy resin or ceramic.

4. The battery device according to claim 1 or 2, characterized in that, The coating is elastic.

5. The battery device according to claim 1 or 2, characterized in that, The thickness of the coating is 0.1mm to 0.3mm.

6. The battery device according to claim 1 or 2, characterized in that, The coating is a brush coating, roller coating, spray coating, dip coating, or electrophoretic coating.

7. The battery device according to claim 1 or 2, characterized in that, The battery cell also includes an insulating component covering the outside of the housing, the insulating component having a clearance hole, and the preset area being the area on the outer surface of the housing located inside the clearance hole.

8. The battery device according to claim 7, characterized in that, The insulating coating is located between the insulating element and the housing, and the insulating coating also partially covers the area on the outer surface of the housing located outside the clearance hole.

9. The battery device according to claim 7, characterized in that, The battery cell includes an electrode terminal electrically connected to the electrode assembly. The housing includes a first wall, the electrode terminal is mounted on the first wall, the first wall has the preset area, and the insulating member includes a first insulating member and a second insulating member. The first insulating member covers the side of the first wall away from the electrode assembly, and the second insulating member covers the other housing walls except the first wall. The first insulating member and the second insulating member form the clearance hole.

10. The battery device according to claim 7, characterized in that, The battery cell includes an electrode terminal electrically connected to the electrode assembly. The housing includes a first wall, the electrode terminal is mounted on the first wall, and the first wall has the preset area. The insulating member includes a first insulating member and a second insulating member. The first insulating member covers the side of the first wall away from the electrode assembly, and the second insulating member covers the first wall and other housing walls on the housing except for the first wall. The first insulating member and the second insulating member form the clearance hole.

11. The battery device according to claim 1 or 2, characterized in that, The battery cell includes at least two electrode terminals electrically connected to the electrode assembly. The at least two electrode terminals are arranged along a preset direction. The housing includes a first wall. The electrode terminals are mounted on the first wall. The first wall has a preset area. The preset area of ​​the first wall is located on the side of one electrode terminal that is away from the other electrode terminal along the preset direction.

12. The battery device according to claim 1 or 2, characterized in that, The pressure strip includes a metal strip and an insulating layer, the insulating layer covering the surface of the metal strip and being bonded to the coating.

13. The battery device according to claim 1 or 2, characterized in that, The battery cell includes an electrode terminal electrically connected to the electrode assembly, the electrode terminal being located on the underside of the battery cell, and the pressure strip being at least partially located at the bottom of the battery cell.

14. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1 to 13.

Images