Battery cell, battery apparatus, and electrical apparatus

Abstract

A battery cell, a battery apparatus, and an electrical apparatus. The battery cell comprises a casing, an electrode assembly, an insulating member, and a first electrode terminal and a second electrode terminal having opposite polarities. The casing is provided with a first wall. The electrode assembly is provided within the casing. The first electrode terminal and the second electrode terminal are provided on the first wall and are arranged at intervals along a first direction, the first direction intersecting the thickness direction of the first wall. Along the thickness direction of the first wall, the insulating member is provided on the side of the first wall facing away from the electrode assembly. The insulating member comprises a first identification portion for indicating the polarity of the first electrode terminal. The above-described arrangement can effectively improve the reliability of the battery apparatus.

Description

Battery cells, battery packs and electrical devices Cross-reference to related applications

[0001] This application claims priority to Chinese patent application 202411447897.2, filed on October 16, 2024, entitled “Battery Cell, Battery Device and Power Consumption Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery device, and an electrical device. Background Technology

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0004] In the development of battery technology, how to improve the reliability of battery devices is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] This application provides a battery cell, a battery device, and an electrical device. The technical solution provided by this application can effectively improve the reliability of the battery device.

[0006] This application is achieved through the following technical solution:

[0007] In a first aspect, some embodiments of this application provide a battery cell, which includes a casing, an electrode assembly, an insulating member, and first and second electrode terminals with opposite polarities. The casing has a first wall. The electrode assembly is disposed within the casing. The first and second electrode terminals are disposed on the first wall and spaced apart along a first direction, which intersects the thickness direction of the first wall. Along the thickness direction of the first wall, the insulating member is disposed on the side of the first wall opposite to the electrode assembly. The insulating member includes a first marking portion for indicating the polarity of the first electrode terminal.

[0008] Compared to the solution of placing the marking part on the surface of the first wall and exposing the marking part by opening a window on the insulating member, the above solution places the first marking part for indicating the polarity of the first electrode terminal on the insulating member. Therefore, the insulating member does not need to be windowed, which can effectively improve the surface insulation performance of the battery cell, reduce the risk of short circuit caused by creepage on the surface of the battery cell, thereby improving the reliability of the battery cell and making the battery device more reliable.

[0009] According to some embodiments of this application, the insulating member further includes an insulating substrate, and a first marking portion is disposed on the insulating substrate, wherein the first marking portion and the insulating substrate are different in color.

[0010] In the above solution, by setting the color of the first marking part to be different from the color of the insulating substrate, it is possible to distinguish the polarity of the electrode terminals, improve the identification of the polarity of the electrode terminals, facilitate the correct use and assembly of the battery cells, and reduce the risk of damage to the electrical device due to reverse polarity connection.

[0011] According to some embodiments of this application, along the thickness direction of the first wall, a first marking portion is disposed on the side of the insulating substrate opposite to the first wall.

[0012] In the above solution, by setting the first marking part on the outside of the insulating substrate, on the one hand, the difficulty of setting the first marking part on the insulating substrate can be reduced, and the manufacturing efficiency of the battery cell can be improved; on the other hand, the first marking part can be directly exposed to the outside, thereby effectively identifying the polarity of the first electrode terminal, which is conducive to distinguishing the positive and negative electrodes of the battery cell, thereby improving the manufacturing efficiency of the battery device and reducing the risk of damage to the battery device due to reverse polarity, resulting in high reliability of the battery device.

[0013] According to some embodiments of this application, the difference between the gray value of the first identifier and the gray value of the insulating substrate is greater than or equal to 25.

[0014] In the above scheme, on the one hand, by acquiring images of the first marking part through the difference in gray values ​​to distinguish the positive and negative electrodes of the battery cells, the difficulty of image acquisition and processing can be effectively reduced, and the efficiency of distinguishing the polarity of the battery cells can be improved. On the other hand, by setting the gray value of the first marking part to be greater than or equal to the difference in gray value with the insulating substrate, the image acquisition and identification of the first marking part can be facilitated, thereby facilitating the distinction of the positive and negative electrodes of the battery cells, improving the manufacturing efficiency of the battery device, and reducing the risk of damage to the battery device due to reverse polarity connection, thus making the battery device highly reliable.

[0015] According to some embodiments of this application, the first marking portion includes a coating disposed on the surface of an insulating substrate.

[0016] In the above solution, the first marking part includes a coating disposed on the surface of the insulating substrate. On the one hand, this simplifies the formation of the first marking part and is conducive to improving the manufacturing efficiency of the battery cell. On the other hand, it makes the first marking part easy to identify, thereby making it easy to distinguish the positive and negative electrodes of the battery cell and improving the manufacturing efficiency of the battery device.

[0017] According to some embodiments of this application, the first marking portion includes a first imprint disposed on the side of the insulating member opposite to the first wall.

[0018] In the above solution, by setting the first imprint on the outside of the insulating part, the recognizability of the first marking part can be effectively improved, thereby quickly indicating the polarity of the first electrode terminal, so as to efficiently distinguish the positive and negative poles of the battery cell, which is conducive to improving the manufacturing efficiency of the battery device and effectively reducing the risk of reverse connection of positive and negative poles.

[0019] According to some embodiments of this application, the insulating member has a first central axis parallel to the first direction, and the distance between the center of the first marking portion and the first central axis along the second direction is not greater than 10 mm. The first direction, the second direction and the thickness direction of the first wall are perpendicular to each other.

[0020] In the above solution, by ensuring that the distance between the center of the first marking portion and the first central axis of the insulating member is no greater than 10mm along the second direction, the first marking portion can be centered or as centered as possible on the insulating member, thereby improving the image acquisition efficiency and accuracy of the first marking portion, and thus improving the manufacturing efficiency of the battery device. On the other hand, when the first marking portion includes the first imprint, by centered or as centered as possible on the insulating member, the impact of the imprint on the structural strength of the insulating member can be reduced, the protective ability and insulation ability of the insulating member against the first wall can be improved, and the battery cell can have higher reliability, thereby making the battery device have higher reliability.

[0021] According to some embodiments of this application, along the second direction, the distance between the center of the first marking portion and the first central axis is no greater than 5 mm.

[0022] In the above solution, by ensuring that the distance between the center of the first marking portion and the first central axis of the insulating member is no greater than 5mm along the second direction, on the one hand, the first marking portion can be centered or as centered as possible on the insulating member along the second direction, thereby effectively improving the efficiency and accuracy of image acquisition equipment in acquiring and recognizing the first marking portion, and thus benefiting the improvement of battery device manufacturing efficiency; on the other hand, when the first marking portion includes the first imprint, by centered or as centered as possible on the insulating member, the impact of the imprint on the structural strength of the insulating member can be effectively reduced, effectively improving the insulating member's protective ability and insulation ability against the first wall, so that the battery cell has high reliability, and thus the battery device has high reliability.

[0023] According to some embodiments of this application, along a first direction, the first marking portion is located on the side of the first electrode terminal opposite to the second electrode terminal.

[0024] In the above solution, by setting the first marking part on the side of the first electrode terminal away from the second electrode terminal, the first marking part is positioned far away from the second electrode terminal, thereby enabling the first marking part to effectively indicate the polarity of the first electrode terminal, which is beneficial to improving the accuracy of distinguishing the positive and negative electrodes of the battery cell, and thus improving the assembly efficiency of the battery device.

[0025] According to some embodiments of this application, along a first direction, the first wall has a first side, and the first marking portion is located between the first side and the first electrode terminal. The minimum distance between the first side and the first marking portion is not less than 5 mm and not more than 50 mm.

[0026] In the above solution, by setting the minimum distance between the first marking part and the first side to be no less than 5mm and no more than 50mm along the first direction, a suitable range can be achieved between the first marking part and the first side. On the one hand, this reduces the risk that the first marking part cannot be captured and recognized by the image acquisition device because it is set too close to the first side; on the other hand, it reduces the risk that the first marking part will interfere with the first electrode terminal or other structural components of the battery cell because it is too far from the first side.

[0027] According to some embodiments of this application, the insulating element further includes a second marking portion for indicating the polarity of the second electrode terminal.

[0028] In the above scheme, the second marking part used to indicate the polarity of the second electrode terminal is provided on the insulating member. On the one hand, the insulating member can effectively provide insulation protection to the first wall, so that the battery cell and battery device have high reliability. On the other hand, it can work with the first marking part to effectively distinguish the positive and negative terminals of the battery cell, thereby making the manufacturing efficiency of the battery device high.

[0029] According to some embodiments of this application, the pattern represented by the first identifier portion is different from the pattern represented by the second identifier portion.

[0030] In the above solution, by setting the pattern of the first marking part to be different from the pattern of the second marking part, the first marking part and the second marking part can be effectively distinguished, thereby facilitating the differentiation of the polarity of the electrode terminals, improving the identification of the polarity of the electrode terminals, facilitating the correct use and assembly of the battery cell, and reducing the risk of damage to the electrical device due to reverse polarity connection.

[0031] According to some embodiments of this application, along a first direction, a first marking portion is located on the side of the first electrode terminal opposite to the second electrode terminal, and a second marking portion is located on the side of the second electrode terminal opposite to the first electrode terminal.

[0032] In the above solution, by placing the first marking part and the second marking part on the outside of their respective corresponding electrode terminals, the first marking part and the second marking part are far apart from each other, thereby enabling the first marking part to effectively indicate the polarity of the first electrode terminal and the second marking part to effectively indicate the polarity of the second electrode terminal, which helps to improve the accuracy of distinguishing the positive and negative electrodes of the battery cell, and thus helps to improve the assembly efficiency of the battery device.

[0033] According to some embodiments of this application, along the thickness direction of the first wall, an information pattern is provided on the side of the first wall opposite to the electrode assembly. The information pattern includes at least one of barcode, QR code, and text.

[0034] In the above scheme, by setting information patterns on the outer side of the first wall, it is possible to trace the process parameters and perform full life cycle analysis of the battery cell during the assembly process of the battery device and the use of the battery cell, which is conducive to improving the reliability of the battery device.

[0035] According to some embodiments of this application, the insulating element includes a transparent portion that covers an information pattern.

[0036] In the above solution, by setting a transparent part to expose the information pattern, on the one hand, it is convenient to capture or scan the information pattern to obtain and trace the parameters of the battery cell; on the other hand, compared with the solution of opening a window on the insulating part to expose the information pattern, covering the information pattern with the transparent part of the insulating part can effectively improve the insulation protection effect of the insulating part, improve the creepage problem of the battery cell, and help improve the reliability of the battery device.

[0037] According to some embodiments of this application, the insulating element further includes an insulating substrate, the insulating substrate having a through hole, and the transparent portion being connected to the insulating substrate and sealing the through hole.

[0038] In the above solution, by opening a through hole in the insulating substrate and sealing the through hole with a transparent part, on the one hand, the information pattern can be identified, thereby obtaining information to trace the battery cell; on the other hand, the insulating component can effectively play the role of insulation protection, which is conducive to improving the reliability of the battery device.

[0039] According to some embodiments of this application, the minimum distance between the information pattern and the wall of the through hole is greater than or equal to 0.5 mm.

[0040] In the above scheme, by setting the minimum distance between the information pattern and the wall of the through hole to be greater than or equal to 0.5 mm, the risk of the insulating substrate obscuring the information pattern can be reduced, so that the information pattern can be effectively identified and scanned.

[0041] According to some embodiments of this application, the minimum distance between the hole wall and the edge of the insulating substrate is greater than or equal to 1 mm.

[0042] In the above scheme, by setting the minimum distance between the hole wall and the edge of the insulating substrate to be greater than or equal to 1 mm, the impact of opening through holes in the insulating substrate on the structural strength can be effectively reduced, so that the insulating component can provide effective insulation protection to the first wall, resulting in high reliability of the battery device.

[0043] According to some embodiments of this application, the capacity of a single battery cell is greater than or equal to 500Ah.

[0044] The battery cells provided by the above solution can improve the problem of surface creepage in battery cells. Especially when the capacity of the battery cell is greater than or equal to 500Ah, it can effectively reduce the risk of short circuit caused by creepage and ensure the reliability of the battery cells to a certain extent, especially the reliability of large-capacity battery cells.

[0045] According to some embodiments of this application, the outer casing is a square casing, with a dimension W1 in the first direction, a dimension T1 in the second direction, and a dimension H1 in the third direction, satisfying 3720cm. 3 ≤W1*T1*H1≤12500cm 3 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm, the first direction, the second direction and the third direction are mutually perpendicular.

[0046] According to some embodiments of this application, the outer casing is a steel casing.

[0047] Secondly, some embodiments of this application also provide a battery device, which includes the battery cell provided in the first aspect.

[0048] Thirdly, some embodiments of this application also provide an electrical device, which includes a battery cell provided in the first aspect and / or a battery device provided in the second aspect, wherein the battery cell is used to provide electrical energy.

[0049] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0050] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 is a schematic diagram of the vehicle structure in some embodiments of this application;

[0052] Figure 2 is an exploded perspective view of the battery device in some embodiments of this application;

[0053] Figure 3 is a perspective view of a single battery cell in some embodiments of this application;

[0054] Figure 4 is an exploded perspective view of a battery cell in some embodiments of this application;

[0055] Figure 5 is a top view of a single battery cell in some embodiments of this application;

[0056] Figure 6 is a schematic diagram of the insulating element in some embodiments of this application;

[0057] Figure 7 is a partial schematic diagram of the internal structure of the insulating element in some embodiments of this application;

[0058] Figure 8 is a partial schematic diagram of the internal structure of the insulating element in some other embodiments of this application;

[0059] Figure 9 is a partial structural schematic diagram of the insulating element in some embodiments of this application;

[0060] Figure 10 is an enlarged view of point A in Figure 5;

[0061] Figure 11 is a schematic diagram of the first wall, insulating substrate, transparent part and information pattern in some embodiments of this application;

[0062] Figure 12 is a schematic diagram of the structure of a single battery cell in some embodiments of this application.

[0063] Icons: 1000 - Vehicle; 100 - Battery Unit; 200 - Controller; 300 - Motor; 20 - Housing; 21 - First Housing Body; 22 - Second Housing Body; 10 - Battery Cell; 11 - Housing; 110 - First Wall; 1100 - First Side; 1101 - Second Side; 1102 - Terminal Hole; 111 - Housing; 12 - Electrode Assembly; 120 - Tab; 121 - Adapter; 13 - First Electrode Terminal; 14 - Second Electrode Terminal; 15 - Insulator; 150 - First Identification Section; 1500 - Coating; 1501 - First Imprint; 151 - Insulating Substrate; 1510 - Through Hole; 152 - Second Identification Section; 1520 - Second Imprint; 153 - Transparent Section; 154 - First Perforation; 155 - Second Perforation; 16 - Information Pattern; z - Thickness Direction of First Wall; y - First Direction; x - Second Direction. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0065] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0066] In this application, the reference to "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 application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0067] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0068] In this application, 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, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0069] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0070] In this application, "multiple" means two or more (including two).

[0071] In this embodiment of the application, 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.

[0072] 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 of this application are not limited to this.

[0073] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, helps prevent short circuits to some extent while allowing active ions to pass through.

[0074] In some embodiments, the positive electrode may 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.

[0075] 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.

[0076] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0077] 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, this 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. 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 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM1), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM6), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0078] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0079] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0080] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0081] 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.

[0082] 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.

[0083] 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, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0084] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0085] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0086] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0087] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a single component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0088] 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.

[0089] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include an electrolyte salt and a solvent.

[0090] In some embodiments, the electrolyte salt may include 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 include at least one selected from 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 selected from 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] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0093] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0094] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0095] As an example, inorganic solid electrolytes may include 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 phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0096] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0097] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0098] In some implementations, the electrode assembly has a stacked structure.

[0099] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0100] 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.

[0101] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0102] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0103] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0104] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0105] 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.

[0106] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0107] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0108] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0109] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; 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 a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0110] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0111] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0112] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0113] As an example, the enclosure may include a first enclosure body and a second enclosure body. The first enclosure body and the second enclosure body are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first enclosure body may be a top cover or a bottom plate.

[0114] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0115] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0116] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. The energy storage device includes energy storage containers, energy storage cabinets, etc. In some embodiments, one or more energy storage devices may constitute at least part of an energy storage system.

[0117] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, the reliability of the battery device must also be taken into account.

[0118] For a typical battery cell, it includes a casing, electrode assembly, and electrode terminals. The electrode assembly is located inside the casing, and the electrode terminals are located on the first wall of the casing and electrically connected to the electrode assembly to enable charging and discharging. To reduce the risk of short circuits between the positive and negative terminals of the battery cell, an insulating component is often installed on the outer side of the first wall. In related technologies, to distinguish the positive and negative terminals, a marking pattern that identifies the polarity of the electrode terminals is often provided on the first wall. To make the marking pattern visible for observation or image acquisition, the insulating component is often windowed. However, the windowed portion of the insulating component can cause creepage problems on the first wall, easily leading to the risk of internal short circuits within the battery cell and affecting battery reliability.

[0119] Based on the above considerations, in order to improve the reliability of the battery device due to the exposure of marking patterns used to indicate the polarity of the electrode terminals by opening windows in the insulating component, embodiments of this application provide a battery cell. The battery cell includes a housing, an electrode assembly, an insulating component, and first and second electrode terminals with opposite polarities. The housing has a first wall. The electrode assembly is disposed within the housing. The first and second electrode terminals are disposed on the first wall and spaced apart along a first direction, which intersects the thickness direction of the first wall. Along the thickness direction of the first wall, the insulating component is disposed on the side of the first wall opposite to the electrode assembly. The insulating component includes a first marking portion for indicating the polarity of the first electrode terminal.

[0120] Compared to the solution of placing the marking part on the surface of the first wall and exposing the marking part by opening a window in the insulating member, the above solution places the first marking part for indicating the polarity of the first electrode terminal on the insulating member. Therefore, there is no need to open a window in the insulating member, which can effectively improve the surface insulation performance of the battery cell, reduce the risk of short circuit caused by creepage on the surface of the battery cell, thereby improving the reliability of the battery cell and making the battery device more reliable.

[0121] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using battery cells and battery devices disclosed in this application. This helps to mitigate the problem of short circuits in battery cells during use, thereby improving the reliability of the battery cells.

[0122] This application provides an electrical device that uses a single battery cell or battery assembly as a power source. The electrical device can be, but is 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.

[0123] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0124] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 in some embodiments of this application. The vehicle 1000 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. A battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, it can serve as the vehicle's operating power source or general power source. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0125] In some embodiments of this application, the battery device 100 can not only serve as the operating power or 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.

[0126] Please refer to Figure 2, which is an exploded perspective view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 20 and battery cells 10, the battery cells 10 being housed within the housing 20.

[0127] The housing 20 provides assembly space for the battery cell 10, and can adopt various structures. In some embodiments, the housing 20 may include a first housing body 21 and a second housing body 22, which overlap each other, and together define an assembly space for accommodating the battery cell 10. The second housing body 22 may be a hollow structure open at one end, and the first housing body 21 may be a plate-like structure, with the first housing body 21 covering the open side of the second housing body 22 so that the first housing body 21 and the second housing body 22 together define the assembly space; alternatively, the first housing body 21 and the second housing body 22 may both be hollow structures open on one side, with the open side of the first housing body 21 covering the open side of the second housing body 22.

[0128] Of course, the box 20 formed by the first box body 21 and the second box body 22 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in Figure 2, the shape of the box 20 is a cuboid.

[0129] In the battery device 100, there can be one or more battery cells 10 disposed within the housing 20. When there are multiple battery cells 10 disposed within the housing 20, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 10 are connected in both series and parallel configurations. Multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 10 is housed within the housing 20. Alternatively, the battery device 100 can also be composed of multiple battery cells 10 first connected in series, in parallel, or in a mixed configuration to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 20.

[0130] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for connecting multiple battery cells 10 to achieve electrical connection between the multiple battery cells 10.

[0131] For example, the housing 20 is provided with a plurality of battery cell assemblies, each battery cell assembly including a plurality of battery cells 10 stacked on top of each other, and the plurality of battery cells 10 are connected in series with each other through a busbar. In some embodiments, the plurality of battery cell assemblies can be connected in series with each other through a busbar.

[0132] Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 10 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in Figure 3, the battery cell 10 has a cuboid structure.

[0133] Some embodiments of this application provide a battery cell 10. Please refer to Figures 3-6. Figure 3 is a perspective view of the battery cell 10 in some embodiments of this application. Figure 4 is an exploded perspective view of the battery cell 10 in some embodiments of this application. Figure 5 is a top view of the battery cell 10 in some embodiments of this application. Figure 6 is a schematic diagram of the insulating member 15 in some embodiments of this application.

[0134] The battery cell 10 includes a housing 11, an electrode assembly 12, an insulator 15, and a first electrode terminal 13 and a second electrode terminal 14 with opposite polarities. The housing 11 has a first wall 110. The electrode assembly 12 is disposed within the housing 11. The first electrode terminal 13 and the second electrode terminal 14 are disposed on the first wall 110 and spaced apart along a first direction y, which intersects the thickness direction z of the first wall. Along the thickness direction z of the first wall, the insulator 15 is disposed on the side of the first wall 110 opposite to the electrode assembly 12. The insulator 15 includes a first marking portion 150 for indicating the polarity of the first electrode terminal 13.

[0135] In some embodiments, the outer casing 11 can also be used to contain an electrolyte, such as an electrolyte solution. The outer casing 11 can have various structural forms, such as a square shell structure, a cylindrical shell structure, or a bag-like structure. The outer casing 11 can also be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0136] In some embodiments, the housing 11 can be a sealed structure or a non-sealed structure. As an example, when the housing 11 is a sealed structure, it can protect the electrode assembly 12 and prevent, to some extent, electrolyte leakage. When the housing 11 is a non-sealed structure, it can still protect the electrode assembly 12, and a sealing bag may be included between the housing 11 and the electrode assembly 12. The sealing bag is used to encapsulate the electrode assembly 12 and the electrolyte, etc. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film.

[0137] In some embodiments, referring to Figures 3 and 4, the housing 11 may include a housing 111 and an end cap. The housing 111 has an internal cavity with an opening, meaning the housing 111 is a hollow structure with one end open. The end cap closes to the opening of the housing 111 to form a sealed connection, thereby creating a sealed space for accommodating the electrode assembly 12 and the electrolyte. In some embodiments, the connection between the end cap and the housing 111 is varied, including but not limited to bonding, welding, riveting, or threaded connections.

[0138] Optionally, the housing 11 may include a housing 111 and two end caps. The two opposite ends of the housing 111 are open, that is, they have two opposite openings. One opening can be closed by one end cap, and the other opening can be closed by the other end cap.

[0139] Optionally, the first wall 110 can be an end cap, or at least a portion of an end cap, or one of a plurality of walls of the housing 111. Exemplarily, in Figures 3 and 4, the first wall 110 is an end cap of the housing 11, and the thickness direction z of the first wall can be the height direction of the battery cell 10. Of course, in other embodiments, the first wall 110 can also be a bottom wall of the housing 111 disposed opposite to the end cap in the thickness direction z of the first wall, or a side wall adjacent to and abutting against the end cap.

[0140] When assembling the battery cell 10, the electrode assembly 12 can be placed into the housing 111 first, and an electrolyte, such as electrolyte solution, can be filled into the housing 111. Then, the end cap can be placed on the opening of the housing 111 to close the opening of the housing 111.

[0141] The housing 111 can have various shapes, such as a cylinder or a cuboid. The shape of the housing 111 can be determined according to the specific shape of the electrode assembly 12. For example, if the electrode assembly 12 is a cylindrical structure, then the housing 111 can be a cylindrical structure; if the electrode assembly 12 is a cuboid structure, then the housing 111 can be a cuboid structure. Of course, the end cap can also have various structures, such as a plate-like structure or a hollow structure with one end open. For example, in Figures 3 and 4, the housing 111 is a cuboid structure, and correspondingly, the end cap is a rectangular plate-like structure.

[0142] The electrode assembly 12 is a component in the battery cell 10 where electrochemical reactions occur. The structure of the electrode assembly 12 can be various. For example, the electrode assembly 12 can be a wound structure formed by winding a positive electrode, a separator, and a negative electrode, or a stacked structure formed by arranging a positive electrode, a separator, and a negative electrode in layers.

[0143] For example, the separator is a separator membrane, and the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0144] In this electrode assembly 12, a tab 120 is formed at one end of the first wall 110 along the thickness direction z. The tab 120 is used to input or output the positive or negative electrode of the electrode assembly 12, and is used to connect with the electrode terminal to realize the electrical connection between the electrode assembly 12 and the electrode terminal. It should be noted that the tab 120 of the electrode assembly 12 is a component formed by stacking and connecting the regions of the positive electrode sheet that are not coated with a positive active material layer, or a component formed by stacking and connecting the regions of the negative electrode sheet that are not coated with a negative active material layer. If the tab 120 is used to output the positive electrode of the electrode assembly 12, then the tab 120 is a component formed by stacking and connecting the regions of the positive electrode sheet that are not coated with a positive active material layer; if the tab 120 is used to output the negative electrode of the electrode assembly 12, then the tab 120 is a component formed by stacking and connecting the regions of the negative electrode sheet that are not coated with a negative active material layer.

[0145] Optionally, the electrode assembly 12 housed within the housing 11 can be one or more. For example, in FIG4, the housing 11 of the battery cell 10 is provided with two electrode assemblies 12, which are stacked along their thickness direction. That is, the two electrode assemblies 12 are stacked along the thickness direction of the battery cell 10. Of course, in other embodiments, the electrode assembly 12 housed within the housing 11 can be one, three, four, five, six, seven, or eight, etc.

[0146] The electrode terminals serve to output or input electrical energy into the battery cell 10. One end of the electrode terminal is used to connect to the tab 120 of the electrode assembly 12, and the other end is used to connect to the busbar component to realize the input or output of electrical energy into the battery cell 10.

[0147] For example, the electrode terminals can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. Of course, in some embodiments, the electrode terminals can also be composite materials, meaning they are formed by connecting two different metal materials together, for example, through hot pressing or cold pressing.

[0148] The first wall 110 is provided with a terminal hole 1102, which extends through both sides of the first wall 110 along the thickness direction z. The electrode terminal is inserted into the terminal hole along the thickness direction z of the first wall, so that part of the electrode terminal is located in the terminal hole 1102. This allows the electrode terminal to be connected to the electrode assembly 12 located inside the housing 11, as well as to the busbar located outside the housing 11, so as to realize the input or output of electrical energy of the battery cell 10.

[0149] The assembly relationship between the electrode terminal and the first wall 110 is varied. For example, the electrode terminal can be riveted to the first wall 110. For instance, the electrode terminal may consist of two riveted parts that clamp the first wall 110. Alternatively, the electrode terminal and the first wall 110 can be connected by other structural components. For example, the electrode terminal may pass through a terminal hole, and a first connector may be welded to the first wall 110. The first connector and the first wall 110 together clamp a portion of the electrode terminal's structure in the thickness direction z of the first wall, thereby assembling the electrode terminal.

[0150] Optionally, the electrode terminals can be directly connected to the tabs 120 of the electrode assembly 12, such as by welding or abutting, or they can be indirectly connected to the tabs 120 of the electrode assembly 12 through other components. Similarly, the connection structure between the electrode terminals and the busbar component can also be varied, such as by welding, abutting, or snap-fitting.

[0151] In some embodiments, as shown in FIG4, the battery cell 10 may further include an adapter 121 disposed within the housing 11. The adapter 121 connects the electrode terminals and the tabs 120 of the electrode assembly 12 to realize the electrical connection between the electrode assembly 12 and the electrode terminals.

[0152] In some embodiments of this application, there are two electrode terminals, including a first electrode terminal 13 and a second electrode terminal 14. The polarity of the first electrode terminal 13 is opposite to that of the second electrode terminal 14, that is, one of them is a positive electrode terminal and the other is a negative electrode terminal. The positive electrode terminal is electrically connected to the corresponding positive electrode tab 120, and the negative electrode terminal is electrically connected to the corresponding negative electrode tab 120.

[0153] The first electrode terminal 13 and the second electrode terminal 14 are respectively disposed on the first wall 110, and the first electrode terminal 13 and the second electrode terminal 14 are arranged at intervals along the first direction y, which is the direction intersecting with the thickness direction z of the first wall. Optionally, the thickness direction z of the first wall can be the height direction of the battery cell 10, and the first direction y can be the width direction or the thickness direction of the battery cell 10.

[0154] In some embodiments, the first electrode terminal 13 and the second electrode terminal 14 may have the same appearance or different appearances. For example, the first electrode terminal 13 and the second electrode terminal 14 may both be cylindrical structures; or the first electrode terminal 13 may be cylindrical and the second electrode terminal 14 may be prismatic structures.

[0155] The insulating element 15 serves as insulation and protection. In some embodiments of this application, the insulating element 15 is disposed on the side of the first wall 110 opposite to the electrode assembly 12, that is, the insulating element 15 is disposed on the outer side of the first wall 110. In some embodiments, the insulating element 15 covers the outer surface of the first wall 110 to reduce the risk of short circuit between the external structure and the first wall 110.

[0156] Optionally, the insulating element 15 may be an insulating layer, insulating film, or insulating patch disposed on the outside of the first wall 110. For example, the insulating element 15 includes a top patch, the material of which may include insulating flame-retardant polycarbonate (PC).

[0157] In some embodiments, the connection relationship between the insulating member 15 and the first wall 110 is diverse, including but not limited to bonding, snap-fitting, and other connection relationships.

[0158] Referring to Figure 6, the insulating member 15 is provided with a first through hole 154 and a second through hole 155. The first through hole 154 allows the first electrode terminal 13 to pass through, and the second through hole 155 allows the second electrode terminal 14 to pass through. In some embodiments, a pressure relief mechanism is provided on the first wall 110 to release the internal pressure of the battery cell 10. In these embodiments, the insulating member 15 may be provided with a third through hole to expose the pressure relief mechanism. Similarly, when the first wall 110 is provided with an injection hole for injecting electrolyte, a corresponding through hole may also be provided on the insulating member 15.

[0159] The insulating member 15 includes a first marking portion 150, which is used to indicate the polarity of the first electrode terminal 13 to distinguish the polarity of the first electrode terminal 13 and the second electrode terminal 14, that is, to distinguish the positive and negative poles of the battery cell 10.

[0160] In some embodiments, the first marking portion 150 is a part or component of the insulating member 15. For example, the first marking portion 150 may be formed on the side of the insulating member 15 facing away from the first wall 110. For example, the first marking portion 150 may be formed on the side of the insulating member 15 facing the first wall 110. For example, along the thickness direction z of the first wall, the first marking portion 150 may be formed between opposite sides of the insulating member 15.

[0161] Optionally, the first marking portion 150 includes a coating 1500 formed on the outer side and / or the inner side of the insulating member 15. Optionally, the first marking portion 150 includes an imprint formed on the outer side and / or the inner side of the insulating member 15. Optionally, the first marking portion 150 includes a combination of an imprint formed on the outer side and / or the inner side of the insulating member 15 and the coating 1500.

[0162] In some embodiments, the "first marking portion 150 for indicating the polarity of the first electrode terminal 13" can be understood as the first marking portion 150 assisting or helping the image acquisition device or operator to identify the polarity of the first electrode terminal 13. For example, the first marking portion 150 is provided on the insulating member 15, and through the arrangement of the positional relationship, the first marking portion 150 can be closer to the first electrode terminal 13 relative to the second electrode terminal 14 to indicate whether the first electrode terminal 13 is a positive or negative terminal. For example, the first marking portion 150 uses a specific symbol or number (e.g., "-" or "+") to indicate whether the first electrode terminal 13 is a negative or positive terminal. For example, the first marking portion 150 uses a specific color to indicate whether the first electrode terminal 13 is a positive or negative terminal.

[0163] In some embodiments, the insulating member 15 may also be provided with a second marking portion 152, which can be used to indicate the polarity of the second electrode terminal 14.

[0164] Compared to the solution of setting the marking part on the surface of the first wall 110 and exposing the marking part by opening a window on the insulating member 15, the above solution sets the first marking part 150 for indicating the polarity of the first electrode terminal 13 on the insulating member 15, which can effectively improve the surface insulation performance of the battery cell 10, reduce the risk of short circuit caused by creepage on the surface of the battery cell 10, thereby improving the reliability of the battery cell 10 and making the battery device 100 have higher reliability.

[0165] According to some embodiments of this application, the insulating member 15 further includes an insulating substrate 151, and a first marking portion 150 is disposed on the insulating substrate 151, wherein the first marking portion 150 and the insulating substrate 151 are different in color.

[0166] The insulating substrate 151 is the insulating base material of the insulating member 15, and plays a role in insulation and protection. In some embodiments, the first marking portion 150 may be disposed on the insulating substrate 151, for example, on the outer or inner side of the insulating substrate 151.

[0167] Optionally, the color of the first marking portion 150 is different from the color of the insulating substrate 151. For example, the color of the insulating substrate 151 is black and the color of the first marking portion 150 is white; or the color of the insulating substrate 151 is white and the color of the first marking portion 150 is black.

[0168] Optionally, in some embodiments, the fact that the colors of the first marking portion 150 and the insulating substrate 151 are different can also be understood as the fact that the gray values ​​of the first marking portion 150 and the insulating substrate 151 are different, for example, one has a gray value of 150 and the other has a gray value of 150.

[0169] In the above solution, by setting the color of the first marking part 150 to be different from the color of the insulating substrate, it is possible to distinguish the polarity of the electrode terminals, improve the identification of the polarity of the electrode terminals, facilitate the correct use and assembly of the battery cell 10, and reduce the risk of damage to the electrical device due to reverse polarity connection.

[0170] According to some embodiments of this application, please refer to FIG7, which is a partial schematic diagram of the internal structure of the insulating member 15 in some embodiments of this application. Along the thickness direction z of the first wall, a first marking portion 150 is disposed on the side of the insulating substrate 151 opposite to the first wall 110.

[0171] Along the thickness direction z of the first wall, the first marking part 150 is disposed on the outside of the insulating substrate 151, that is, the first marking part 150 can be directly acquired by the image acquisition device or directly observed by the operator.

[0172] In the above solution, by setting the first marking part 150 on the outside of the insulating substrate 151, on the one hand, the difficulty of setting the first marking part 150 on the insulating substrate 151 can be reduced, and the manufacturing efficiency of the battery cell 10 can be improved; on the other hand, the first marking part 150 can be directly exposed to the outside, thereby effectively identifying the polarity of the first electrode terminal 13, which is conducive to distinguishing the positive and negative electrodes of the battery cell 10, thereby improving the manufacturing efficiency of the battery device 100 and reducing the risk of damage to the device due to reverse polarity, thus making the battery device 100 highly reliable.

[0173] In other embodiments, the first marking portion 150 may also be disposed on the inner side of the insulating substrate 151. For example, the insulating substrate 151 may be made of a transparent material, and the first marking portion 150 may be set to be opaque. This also allows the image acquisition device to directly acquire the image through the insulating substrate 151 or the operator to directly observe the first marking portion 150 through the insulating substrate 151.

[0174] According to some embodiments of this application, the difference between the gray value of the first identification portion 150 and the gray value of the insulating substrate 151 is greater than or equal to 25.

[0175] Grayscale value refers to the color depth of a point in a black and white image. It generally ranges from 0 to 255, with white being 255 and black being 0. Therefore, black and white images are also called grayscale images.

[0176] Grayscale values ​​can also be understood as the intensity of a color. In a grayscale image, the number of pixels with each grayscale value is counted, and a grayscale histogram can be drawn. Grayscale means no color, where all RGB color components are equal. Grayscale conversion is the process of converting a color image to a grayscale image, usually performed to speed up image processing algorithms. Grayscale values ​​can also be calculated from the RGB values ​​of a color image using specific algorithms. Common algorithms include the averaging method, the weighted averaging method, and the green-only method.

[0177] The statement "the difference between the grayscale value of the first identifier 150 and the grayscale value of the insulating substrate 151 is greater than or equal to 25" can be understood as meaning that there is a difference between the grayscale value of the first identifier 150 and the grayscale value of the insulating substrate 151, and that the difference is greater than or equal to 25. For example, the difference could be 25, 26, 27, 28, 29, 30, 31, 32, or a larger value. Optionally, the grayscale value of the insulating substrate 151 can be 0, and the grayscale value of the first identifier 150 can be a value greater than or equal to 25. For example, the grayscale value of the insulating substrate 151 can be 0, and the grayscale value of the first identifier 150 can be 255.

[0178] In the above scheme, on the one hand, by acquiring images of the first marking section 150 through the difference in grayscale values ​​to distinguish the positive and negative electrodes of the battery cell 10, the difficulty of image acquisition and processing can be effectively reduced, and the efficiency of distinguishing the polarity of the battery cell 10 can be improved. On the other hand, by setting the grayscale value of the first marking section 150 to have a difference of more than or equal to 25 from the grayscale value of the insulating substrate 151, the image acquisition and identification of the first marking section 150 can be facilitated, thereby facilitating the distinction of the positive and negative electrodes of the battery cell 10, improving the manufacturing efficiency of the battery device 100, and reducing the risk of damage to the battery device due to reverse polarity connection, thus making the battery device 100 highly reliable.

[0179] According to some embodiments of this application, please refer to FIG7, the first marking portion 150 includes a coating 1500 disposed on the surface of the insulating substrate 151.

[0180] In some embodiments, the first marking portion 150 may include a coating layer structure disposed on the surface of the insulating substrate 151. Optionally, the first marking portion 150 may include a coating 1500 coated on the outside of the insulating substrate 151 or a coating 1500 coated on the inside of the insulating substrate 151.

[0181] In some embodiments, the coating 1500 may be a pigment coating 1500 having a different color from the insulating substrate 151, and may be applied to the insulating substrate 151 by spraying, printing or other means.

[0182] In the above scheme, the first marking part 150 includes a coating 1500 disposed on the surface of the insulating substrate 151. On the one hand, this simplifies the formation of the first marking part 150 and is conducive to improving the manufacturing efficiency of the battery cell 10. On the other hand, it makes the first marking part 150 easy to identify, thereby making it easier to distinguish the positive and negative electrodes of the battery cell 10 and is conducive to improving the manufacturing efficiency of the battery device 100.

[0183] According to other embodiments of this application, please refer to Figures 8 and 9. Figure 8 is a partial schematic diagram of the internal structure of the insulating member 15 in some embodiments of this application, and Figure 9 is a partial schematic diagram of the structure of the insulating member 15 in some embodiments of this application. The first marking portion 150 includes a first imprint 1501 disposed on the side of the insulating member 15 opposite to the first wall 110.

[0184] In some embodiments, the first imprint 1501 may refer to a groove-shaped structure disposed on the outside of the insulating member 15. The first imprint 1501 may extend based on the shape of the pattern of the first marking portion 150. For example, please refer to FIG9, the pattern of the first marking portion 150 is "-", and the first imprint 1501 may include one or more line segment-shaped grooves to form the pattern "-".

[0185] Optionally, the first marking portion 150 can be a combination of coating 1500 and first imprint 1501. Referring to FIG8, the first imprint 1501 is formed on the outer side of the insulating substrate 151. The groove sidewall and / or groove bottom wall of the first imprint 1501 can be provided with coating 1500. The first imprint 1501 and the coating 1500 provided on the first imprint 1501 together form the first marking portion 150.

[0186] In some embodiments, the first imprint 1501 does not penetrate the insulating substrate 151 along the thickness direction z of the first wall.

[0187] In the above solution, by providing a first imprint 1501 on the outside of the insulating part 15, the recognizability of the first marking part 150 can be effectively improved, thereby quickly indicating the polarity of the first electrode terminal 13, so as to efficiently distinguish the positive and negative electrodes of the battery cell 10, which is conducive to improving the manufacturing efficiency of the battery device 100 and effectively reducing the risk of reverse connection of positive and negative electrodes.

[0188] According to some embodiments of this application, the insulating member 15 has a first central axis parallel to the first direction y, and the distance between the center of the first marking portion 150 and the first central axis along the second direction x is no greater than 10 mm. The first direction y, the second direction x and the thickness direction z of the first wall are mutually perpendicular.

[0189] In some embodiments, the first direction y and the second direction x are perpendicular to each other, and the first central axis of the insulating member 15 is parallel to the first direction y. Optionally, the first direction y can be the width direction of the battery cell 10, and the second direction x can be the thickness direction of the battery cell 10.

[0190] The center of the first marking part 150 can be the geometric center of the first marking part 150. It can be found by drawing software or by plumb bob or other methods.

[0191] Please refer to Figure 5, which shows the first central axis in dashed lines. Along the second direction x, the distance between the center of the first marking part 150 and the first central axis is J. The value of J is no greater than mm. For example, the value of J is 10mm, 9mm, 8mm, 7mm, 6mm, 5mm, 4mm, 3mm, 2mm, 1mm, 0, or any value between two adjacent values.

[0192] In the above scheme, along the second direction x, by ensuring that the distance between the center of the first marking portion 150 and the first central axis of the insulating member 15 is no greater than 10mm, on the one hand, the first marking portion 150 can be centered or as centered as possible on the insulating member 15 along the second direction x, thereby improving the image acquisition efficiency and accuracy of the first marking portion 150, and thus improving the manufacturing efficiency of the battery device 100; on the other hand, when the first marking portion 150 includes the first imprint 1501, by centered or as centered as possible on the insulating member 15, the impact of the imprint on the structural strength of the insulating member 15 can be reduced, improving the protective and insulating capabilities of the insulating member 15 against the first wall 110, making the battery cell 10 have higher reliability, and thus making the battery device 100 have higher reliability.

[0193] According to some embodiments of this application, the distance between the center of the first marking portion 150 and the first central axis along the second direction x is no greater than 5 mm.

[0194] Along the second direction x, the distance between the center of the first marking part 150 and the first central axis is J. The value of J is no greater than 5mm. For example, the value of J is 5mm, 4mm, 3mm, 2mm, 1mm, 0 or any value between two adjacent values.

[0195] In the above scheme, along the second direction x, by ensuring that the distance between the center of the first marking portion 150 and the first central axis of the insulating member 15 is no greater than 5mm, on the one hand, the first marking portion 150 can be centered or as centered as possible on the insulating member 15 along the second direction x, thereby effectively improving the efficiency and accuracy of the image acquisition device in acquiring and recognizing the first marking portion 150, and thus benefiting the improvement of the manufacturing efficiency of the battery device 100; on the other hand, when the first marking portion 150 includes the first imprint 1501, by centered or as centered as possible on the insulating member 15, the impact of the imprint on the structural strength of the insulating member 15 can be effectively reduced, effectively improving the protective and insulating capabilities of the insulating member 15 against the first wall 110, making the battery cell 10 have higher reliability, and thus making the battery device 100 have higher reliability.

[0196] According to some embodiments of this application, please refer to Figures 3-5. Along the first direction y, the first marking portion 150 is located on the side of the first electrode terminal 13 opposite to the second electrode terminal 14.

[0197] In some embodiments, the first marking portion 150 is used to indicate the polarity of the first electrode terminal 13. In terms of position, along the arrangement direction of the first electrode terminal 13 and the second electrode terminal 14, the first marking portion 150 is located on the side of the first electrode terminal 13 opposite to the second electrode terminal 14. That is, when observing the insulating member 15 along the first direction y, the observation sequence can be the first marking portion 150, the first electrode terminal 13 and the second electrode terminal 14, or the second electrode terminal 14, the first electrode terminal 13 and the first marking portion 150.

[0198] In the above scheme, by setting the first marking part 150 on the side of the first electrode terminal 13 away from the second electrode terminal 14, the first marking part 150 is positioned far away from the second electrode terminal 14, thereby enabling the first marking part 150 to effectively indicate the polarity of the first electrode terminal 13, which is beneficial to improving the accuracy of distinguishing the positive and negative electrodes of the battery cell 10, and thus improving the assembly efficiency of the battery device 100.

[0199] Optionally, in some other embodiments, along the first direction y, the first marking portion 150 is located on the side of the first electrode terminal 13 facing the second electrode terminal 14. Optionally, in some other embodiments, along the first direction y, the first marking portion 150 is located on the side of the first electrode terminal 13 facing the second electrode terminal 14, and the first marking portion 150 is closer to the first electrode terminal 13.

[0200] According to some embodiments of this application, please refer to FIG5. Along the first direction y, the first wall 110 has a first side 1100, and the first marking portion 150 is located between the first side 1100 and the first electrode terminal 13. The minimum distance between the first side 1100 and the first marking portion 150 is not less than 5 mm and not more than 50 mm.

[0201] The first direction y is the arrangement direction of the first electrode terminal 13 and the second electrode terminal 14. In some embodiments, the first wall 110 has a first side 1100 in the first direction y, and its first marking portion 150 is located between the first side 1100 and the first electrode terminal 13, that is, the first marking portion 150 is closer to the first side 1100 than the first electrode terminal 13.

[0202] The "minimum distance between the first side 1100 and the first marking portion 150" can be understood as the distance between the part of the first marking portion 150 closest to the first side 1100 and the first side 1100 along the first direction y. Optionally, the first marking portion 150 includes a first imprint 1501, and the distance between the first imprint 1501 and the groove sidewall closest to the first side 1100 is the same as the distance between the first imprint 1501 and the first side 1100.

[0203] Please refer to Figure 5. The minimum distance M between the first side 1100 and the first marking part 150 is not less than 5mm and not more than 50mm. For example, the value of M can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm...40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm or any value between two adjacent values.

[0204] In the above solution, by setting the minimum distance between the first marking part 150 and the first side 1100 to be no less than 5mm and no more than 50mm along the first direction y, a suitable range can be achieved between the first marking part 150 and the first side 1100. On the one hand, this reduces the risk that the first marking part 150 cannot be captured and recognized by the image acquisition device because it is set too close to the first side 1100. On the other hand, it reduces the risk that the first marking part 150 will interfere with the first electrode terminal 13 or other structural components of the battery cell 10 because it is too far from the first side 1100.

[0205] According to some embodiments of this application, please refer to Figures 3-6. The insulating member 15 also includes a second marking portion 152, which is used to indicate the polarity of the second electrode terminal 14.

[0206] The second marking portion 152 is a part of the insulating member 15 used to indicate the polarity of the second electrode terminal 14. That is, the function of the second marking portion 152 includes distinguishing the polarity of the first electrode terminal 13 and the second electrode terminal 14.

[0207] In some embodiments, the second marking portion 152 is a part or component of the insulating member 15. For example, the second marking portion 152 may be formed on the side of the insulating member 15 facing away from the first wall 110. For example, the second marking portion 152 may be formed on the side of the insulating member 15 facing the first wall 110. For example, along the thickness direction z of the first wall, the second marking portion 152 may be formed between opposite sides of the insulating member 15.

[0208] Optionally, the second marking portion 152 includes a coating 1500 formed on the outer side and / or the inner side of the insulating member 15. Optionally, the second marking portion 152 includes an imprint formed on the outer side and / or the inner side of the insulating member 15. Optionally, the second marking portion 152 includes a combination of an imprint formed on the outer side and / or the inner side of the insulating member 15 and the coating 1500.

[0209] In some embodiments, "for indicating the polarity of the second electrode terminal 14" can be understood as the second marking portion 152 assisting or helping the image acquisition device or operator to identify the polarity of the second electrode terminal 14. For example, the second marking portion 152 is provided on the insulating member 15, and through the arrangement of positional relationships, the second marking portion 152 is positioned closer to the second electrode terminal 14 relative to the first electrode terminal 13 to indicate whether the second electrode terminal 14 is positive or negative. For example, the second marking portion 152 uses a specific symbol or number (e.g., "-" or "+") to indicate whether the second electrode terminal 14 is negative or positive. For example, the second marking portion 152 uses a specific color to indicate whether the second electrode terminal 14 is positive or negative.

[0210] In some embodiments, the polarity of the first electrode terminal 13 and the second electrode terminal 14 can be distinguished by differentiating the first marking portion 150 and the second marking portion 152. Optionally, the first marking portion 150 and the second marking portion 152 can be distinguished, and the methods of distinction include, but are not limited to, color, pattern, imprint depth, or other distinguishable methods. For example, the first marking portion 150 and the second marking portion 152 have different colors, and their grayscale values ​​differ; for example, the first marking portion 150 and the second marking portion 152 have different patterns, one being "-" and the other being "+".

[0211] Optionally, the second marking portion 152 is disposed on the insulating substrate 151, and the colors of the second marking portion 152 and the insulating substrate 151 are different. For example, the difference between the gray value of the second marking portion 152 and the gray value of the insulating substrate 151 is greater than or equal to 25.

[0212] Optionally, the second marking portion 152 includes a coating 1500 disposed on the surface of the insulating substrate 151, for example, the second marking portion 152 includes a coating 1500 disposed on the outside of the insulating substrate 151.

[0213] Optionally, the second marking portion 152 includes a second imprint 1520 disposed on the side of the insulating member 15 away from the first wall 110. The second imprint 1520 is a groove structure formed on the outside of the insulating substrate 151, which does not penetrate the insulating substrate 151.

[0214] Optionally, the second marking portion 152 includes a second imprint 1520 disposed on the side of the insulating member 15 opposite to the first wall 110, and a coating 1500 disposed on the groove sidewall and groove bottomwall of the second imprint 1520.

[0215] In some embodiments, the distance between the center of the second marking portion 152 and the first central axis along the second direction x is no greater than 10 mm. Optionally, the distance between the center of the second marking portion 152 and the first central axis along the second direction x is no greater than 5 mm.

[0216] In some embodiments, referring to FIG5, along the first direction y, the first wall 110 has a second side 1101, the second side 1101 and the first side 1100 are opposite to each other, and the second marking portion 152 is located between the second side 1101 and the second electrode terminal 14. Optionally, in these embodiments, the minimum distance between the second side 1101 and the second marking portion 152 is not less than 5 mm and not more than 50 mm.

[0217] In the above scheme, the second marking part 152 for indicating the polarity of the second electrode terminal 14 is provided on the insulating member 15. On the one hand, the insulating member 15 can effectively provide insulation protection to the first wall 110, so that the battery cell 10 and the battery device 100 have high reliability. On the other hand, it can work with the first marking part 150 to effectively distinguish the positive and negative terminals of the battery cell 10, thereby making the manufacturing efficiency of the battery device 100 high.

[0218] According to some embodiments of this application, please refer to Figures 3-6, the pattern represented by the first marking portion 150 is different from the pattern represented by the second marking portion 152.

[0219] In some embodiments, the pattern represented by the first marking portion 150 is different from the pattern represented by the second marking portion 152. Optionally, the shapes of the patterns represented by the first marking portion 150 and the second marking portion 152 are different; alternatively, the sizes of the patterns represented by the first marking portion 150 and the second marking portion 152 are different.

[0220] For example, please refer to Figures 3-6. The first electrode terminal 13 is the negative electrode, the second electrode terminal 14 is the positive electrode, the pattern represented by the first marking portion 150 can be "-", and the pattern represented by the second marking portion 152 can be "+".

[0221] In some other embodiments, the shapes of the patterns represented by the first marking portion 150 and the second marking portion 152 may be the same, but the size of one of them may be significantly larger than the size of the other, so that the positive and negative poles can also be distinguished.

[0222] In the above solution, by setting the pattern of the first marking part 150 to be different from the pattern of the second marking part 152, the first marking part 150 and the second marking part 152 can be effectively distinguished, thereby facilitating the differentiation of the polarity of the electrode terminals, improving the identification of the polarity of the electrode terminals, facilitating the correct use and assembly of the battery cell 10, and reducing the risk of damage to the electrical device due to reverse polarity connection.

[0223] According to some embodiments of this application, please refer to Figures 3-6. Along the first direction y, the first marking portion 150 is located on the side of the first electrode terminal 13 opposite to the second electrode terminal 14, and the second marking portion 152 is located on the side of the second electrode terminal 14 opposite to the first electrode terminal 13.

[0224] In some embodiments, the first marking portion 150 is used to indicate the polarity of the first electrode terminal 13, and the second marking portion 152 is used to indicate the polarity of the second electrode terminal 14. Positionally, along the arrangement direction of the first electrode terminal 13 and the second electrode terminal 14, the first marking portion 150 is located on the side of the first electrode terminal 13 opposite to the second electrode terminal 14, and the second marking portion 152 is located on the side of the second electrode terminal 14 opposite to the first electrode terminal 13. That is, both marking portions are located outside their respective electrode terminals. In other words, when observing the insulating member 15 along the first direction y, the observation sequence can be the first marking portion 150, the first electrode terminal 13, the second electrode terminal 14, and the second marking portion 152, or the second marking portion 152, the second electrode terminal 14, the first electrode terminal 13, and the first marking portion 150.

[0225] In the above scheme, by disposing the first marking part 150 and the second marking part 152 on the outside of their respective corresponding electrode terminals, the first marking part 150 and the second marking part 152 are far apart from each other, so that the first marking part 150 effectively indicates the polarity of the first electrode terminal 13 and the second marking part 152 effectively indicates the polarity of the second electrode terminal 14, which helps to improve the accuracy of distinguishing the positive and negative electrodes of the battery cell 10, and thus helps to improve the assembly efficiency of the battery device 100.

[0226] According to some embodiments of this application, along the thickness direction z of the first wall, an information pattern 16 is provided on the side of the first wall 110 opposite to the electrode assembly 12. The information pattern 16 includes at least one of barcode, QR code and text.

[0227] The information pattern 16 can be used to indicate the parameter information of the battery cell 10. For example, the information pattern 16 can indicate the production date of the battery cell 10, various data parameters in the production process, etc., so as to facilitate subsequent traceability management.

[0228] The information pattern 16 is disposed on the outer side of the first wall 110. The information pattern 16 is disposed on the first wall 110 in various forms. It can be disposed directly or indirectly on the first wall 110, and the forms of disposal on the first wall 110 include, but are not limited to, etching, stamping, coating, pasting, snap-fitting or threaded connection.

[0229] For example, the information pattern 16 can be etched onto the first wall 110. Or, for example, the information pattern 16 is first formed on a plate-like structure, which is attached to the first wall 110 by bonding, snapping, welding or threading.

[0230] The information pattern 16 can take various forms, including at least one of barcodes, QR codes, and text, to facilitate the writing of information related to the battery cell 10 into the information pattern 16, so that the information pattern 16 serves as a carrier of information related to the battery cell 10.

[0231] Alternatively, the text can be numbers, letters, Chinese characters, foreign languages, or symbols, etc., used as a carrier of thoughts or language.

[0232] Optionally, the identification of the information pattern 16 of the battery cell 10 can be performed by scanning or by human eye recognition, depending on the specific form of the information pattern 16, without any restrictions.

[0233] In the above scheme, by setting information pattern 16 on the outer side of the first wall 110, it is possible to perform process parameter traceability and process life analysis on the battery cell 10 during the assembly process of the battery device 100 and the use of the battery cell 10, which is beneficial to improving the reliability of the battery device 100.

[0234] According to some embodiments of this application, please refer to the figures, Figure 10 being an enlarged view of point A in Figure 5. The insulating member 15 includes a transparent portion 153, which covers the information pattern 16.

[0235] The transparent portion 153 can refer to a transparent part that allows light to pass through, so that the information pattern 16 covered by the transparent portion 153 can be identified and observed, thereby enabling the acquisition of relevant information recorded in the information pattern 16.

[0236] In some embodiments, the insulating member 15 may be made of a transparent and insulating material to cover the information pattern 16 and to satisfy the acquisition and recognition of the information pattern 16.

[0237] In some embodiments, a portion of the insulating member 15 may be transparent, forming a transparent portion 153.

[0238] In some embodiments, the transparent portion 153 is a separate structure. For example, the insulating member 15 includes an insulating substrate 151 and a transparent portion 153. The insulating substrate 151 has a through hole 1510. By exposing the information pattern 16, the transparent portion 153 is disposed on the outside of the insulating substrate 151 and covers the through hole 1510.

[0239] In the above solution, by setting a transparent part 153 to expose the information pattern 16, on the one hand, it is convenient to capture or scan the information pattern 16 to obtain and trace the parameters of the battery cell 10; on the other hand, compared with the solution of opening a window on the insulating part 15 to expose the information pattern 16, it can effectively improve the insulation protection effect of the insulating part 15, improve the creepage problem of the battery cell 10, and help improve the reliability of the battery device 100.

[0240] According to some embodiments of this application, please refer to FIG11, which is a schematic diagram of the first wall 110, insulating substrate 151, transparent portion 153 and information pattern 16 in some embodiments of this application.

[0241] In some embodiments, the insulating member 15 further includes an insulating substrate 151, the insulating substrate 151 having a through hole 1510, and the transparent portion 153 being connected to the insulating substrate 151 and sealing the through hole 1510.

[0242] The insulating substrate 151 has a through hole 1510 extending along the thickness direction z of the first wall. The projection of the hole wall of the through hole 1510 onto the first wall 110 along the thickness direction z of the first wall can surround the information pattern 16.

[0243] The transparent portion 153 is connected to the insulating substrate 151 to seal the through hole 1510, and image information can be identified and obtained through the transparent portion 153. The connection between the transparent portion 153 and the insulating substrate 151 can be varied. For example, the transparent portion 153 and the insulating substrate 151 can be bonded together by means of bonding, hot melting, hot pressing, etc.

[0244] In some embodiments, the transparent portion 153 may be disposed on the outer side of the insulating substrate 151 and connected to the surface of the insulating substrate 151. In other embodiments, the transparent portion 153 may be disposed on the inner side of the insulating substrate 151 and connected to the inner surface of the insulating substrate 151. In still other embodiments, the transparent portion 153 may be connected to the wall of the through hole 1510.

[0245] In the above solution, by opening a through hole 1510 on the insulating substrate 151 and sealing the through hole 1510 with a transparent part 153, on the one hand, the information pattern 16 can be identified, thereby obtaining information to trace the battery cell 10; on the other hand, the insulating part 15 can effectively play the role of insulation protection, which is conducive to improving the reliability of the battery device 100.

[0246] According to some embodiments of this application, the minimum distance between the information pattern 16 and the hole wall of the through hole 1510 is greater than or equal to 0.5 mm.

[0247] In some embodiments, the size of the information pattern 16 is smaller than the size of the through hole 1510, that is, there is a gap between the information pattern 16 and the hole wall of the through hole 1510.

[0248] Please refer to Figure 11. The minimum distance N between the information pattern 16 and the hole wall of the through hole 1510 is greater than or equal to 0.5 mm. For example, the value of N can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm or a larger value, or any value between two adjacent values.

[0249] In the above scheme, by setting the minimum distance between the information pattern 16 and the hole wall of the through hole 1510 to be greater than or equal to 0.5mm, the risk of the insulating substrate 151 blocking the information pattern 16 can be reduced, so that the information pattern 16 can be effectively identified and scanned.

[0250] According to some embodiments of this application, the minimum distance between the hole wall of the through hole 1510 and the edge of the insulating substrate 151 is greater than or equal to 1 mm.

[0251] In some embodiments, the through hole 1510 is at a distance from the edge of the insulating substrate 151, and the minimum distance between the through hole 1510 and the edge of the insulating substrate 151 is greater than or equal to 1 mm. For example, the distance between the hole wall of the through hole 1510 and the edge of the insulating substrate 151 is the minimum in the second direction x, and the value of this distance is at least equal to 1 mm or a larger value.

[0252] Please refer to Figure 11. The minimum distance P between the wall of the through hole 1510 and the edge of the insulating substrate 151 can be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm or a larger value, or any value between two adjacent values.

[0253] In the above scheme, by setting the minimum distance between the hole wall of the through hole 1510 and the edge of the insulating substrate 151 to be greater than or equal to 1 mm, the impact of opening the through hole 1510 on the structural strength of the insulating substrate 151 can be effectively reduced, so that the insulating component 15 can provide effective insulation protection to the first wall 110, and the battery device 100 has high reliability.

[0254] According to some embodiments of this application, the capacity of the battery cell 10 is greater than or equal to 500Ah.

[0255] In some embodiments, the capacity of a single battery cell 10 can refer to the total amount of charge stored in a single battery cell 10, and its unit can be Ah, ampere-hour.

[0256] In some embodiments, the capacity of the battery cell 10 provided above may be greater than or equal to 500Ah, such as 500Ah, 550Ah, 600Ah or larger.

[0257] The battery cell 10 provided by the above solution can improve the problem of surface creepage of the battery cell 10. Especially when the capacity of the battery cell 10 is greater than or equal to 500Ah, it can effectively reduce the risk of short circuit caused by creepage and ensure the reliability of the battery cell 10 to a certain extent, especially the reliability of large-capacity battery cells 10.

[0258] According to some embodiments of this application, please refer to Figure 12, which is a schematic diagram of the structure of the battery cell 10 in some embodiments of this application. The outer casing 11 is a square casing, the dimension of the outer casing 11 in the first direction y is W1, the dimension of the outer casing 11 in the second direction x is T1, and the dimension of the outer casing 11 in the third direction is H1, which satisfies 3720cm. 3 ≤W1*T1*H1≤12500cm 360mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm, the first direction y, the second direction x and the third direction are mutually perpendicular.

[0259] The first direction y can be the width direction of the battery cell 10, the second direction x can be the thickness direction of the battery cell 10, and the third direction can be the height direction of the battery cell 10. For example, the third direction can be parallel to the thickness direction z of the first wall.

[0260] In some embodiments, the thickness of the outer casing 11 is T1, the width is W1, and the height is H1, which can satisfy the following condition: 3720cm 3 ≤W1*T1*H1≤12500cm 3 , 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm.

[0261] For example, W1*T1*H1 is the value obtained by multiplying W1, T1, and H1, and W1*T1*H1 can take the value 3720cm. 3 Up to 12500cm 3 Any value between, and the two values.

[0262] For example, the value of T1 can be no less than 60mm and no more than 150mm. For example, the value of T1 can be 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm or any value between two adjacent values.

[0263] For example, the value of H1 can be no less than 120mm and no more than 400mm. For example, the value of T1 can be 120mm, 130mm, 140mm, 150mm, 160mm...360mm, 370mm, 380mm, 390mm, 400mm or any value between two adjacent values.

[0264] For example, the value of W1 can be no less than 200mm and no more than 1500mm. For example, the value of T1 can be 200mm, 210mm, 220mm, 230mm, 240mm...1360mm, 1370mm, 1380mm, 1390mm, 1400mm or any value between two adjacent values.

[0265] According to some embodiments of this application, the outer casing 11 is a steel casing.

[0266] In some embodiments, the outer casing 11 may be made of steel or stainless steel. In some embodiments, the outer casing 11 is a steel casing, and the thickness of the outer casing 11 may be thinner than that of an aluminum casing, in order to improve the volumetric energy density of the battery cell 10.

[0267] According to some embodiments of this application, some embodiments of this application also provide a battery device 100, which includes a battery cell 10 provided in the first aspect.

[0268] As shown in Figure 2, the battery device 100 may also include a housing 20, in which the battery cells 10 are housed.

[0269] In some embodiments, the housing 20 may include a first housing body 21 and a second housing body 22, the first housing body 21 and the second housing body 22 covering each other, the first housing body 21 and the second housing body 22 together defining an assembly space for accommodating the battery cell 10.

[0270] Optionally, the second box body 22 can be a hollow structure with one end open, and the first box body 21 can be a plate-like structure. The first box body 21 covers the open side of the second box body 22 so that the first box body 21 and the second box body 22 together define the assembly space; the first box body 21 and the second box body 22 can also be hollow structures with one side open, and the open side of the first box body 21 covers the open side of the second box body 22.

[0271] Of course, the box 20 formed by the first box body 21 and the second box body 22 can be of various shapes, such as a cylinder or a cuboid. For example, in Figure 2, the box 20 is a cuboid structure.

[0272] Optionally, the battery cell 10 disposed within the housing 20 can be one or more. For example, in Figure 2, the housing 20 of the battery device 100 contains multiple battery cells 10, which can be connected in series, parallel, or a combination thereof. A combination thereof means that some of the battery cells 10 are connected in series and others in parallel. Multiple battery cells 10 can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of the multiple battery cells 10 is housed within the housing 20. Alternatively, the battery device 100 can also consist of multiple battery cells 10 first connected in series, parallel, or a combination thereof to form a battery module, and then these battery modules are connected in series, parallel, or a combination thereof to form a whole, which is then housed within the housing 20.

[0273] The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component that connects multiple battery cells 10 to achieve electrical connection between the multiple battery cells 10.

[0274] It should be noted that in some embodiments, the battery device 100 may not have a housing 20. The battery device 100 includes multiple battery cells 10, and the battery device 100 composed of multiple battery cells 10 can be directly mounted onto the electrical device to provide power to the electrical device through the multiple battery cells 10. That is, the housing 20 can be part of the electrical device. Taking a vehicle 1000 as an example, the housing 20 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 20 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 20 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0275] Some embodiments of this application also provide an electrical device, which includes the battery cell 10 provided above and / or the battery device 100 provided above, wherein the battery cell 10 is used to provide electrical energy.

[0276] The electrical device can be any of the aforementioned devices or systems that utilize battery cells 10 and / or battery devices 100. For example, the electrical device can be a vehicle 1000, which can be a range-extended vehicle 1000, a pure electric vehicle 1000, or a gasoline-powered vehicle 1000. The electrical energy provided by the battery cells 10 can be used to meet the power needs of the vehicle 1000 during startup, navigation, and operation.

[0277] Some embodiments of this application provide a battery cell 10, as shown in Figures 3-12. The battery cell 10 is a square battery cell 10, which includes a housing 11, an electrode assembly 12, an insulating member 15, and a first electrode terminal 13 and a second electrode terminal 14 with opposite polarities.

[0278] The outer casing 11 is a square casing. Taking the width direction of the outer casing 11 as the first direction y, the thickness direction of the outer casing 11 as the second direction x, and the height direction of the outer casing 11 as the third direction, this will be used as an example. In some embodiments, the battery cell 10 can be a battery cell 10 with a large capacity, which is greater than or equal to 500Ah.

[0279] Electrode assembly 12 is disposed within housing 11. In a third direction, housing 11 has a first wall 110, on which a first electrode terminal 13 and a second electrode terminal 14 are disposed, the first electrode terminal 13 and the second electrode terminal 14 being arranged at intervals along a first direction y.

[0280] The insulating layer can be an insulating layer or an insulating sheet, which is disposed on the outside of the first wall 110 and has terminal holes for the first electrode terminal 13 and the second electrode terminal 14 to pass through.

[0281] The insulating component 15 includes a first marking portion 150 and a second marking portion 152. The first marking portion 150 is used to indicate the polarity of the first electrode terminal 13, and the second marking portion 152 is used to indicate the polarity of the second electrode terminal 14, so as to jointly distinguish the positive and negative electrodes of the battery cell 10.

[0282] The insulating component 15 includes an insulating substrate 151 that provides insulation and protection.

[0283] Optionally, the first marking portion 150 includes a first imprint 1501 disposed on the side of the insulating substrate 151 opposite to the first wall 110, and a coating 1500 disposed on the groove sidewall and groove bottom wall of the first imprint 1501. The color of the coating 1500 disposed on the first imprint 1501 can be distinguished from the color of the insulating substrate 151, for example, the difference in their grayscale values ​​is greater than or equal to 25.

[0284] Optionally, the second marking portion 152 includes a second imprint 1520 disposed on the side of the insulating substrate 151 opposite to the first wall 110, and a coating 1500 disposed on the groove sidewall and groove bottomwall of the second imprint 1520. The color of the coating 1500 disposed on the second imprint 1520 can be distinguished from the color of the insulating substrate 151, for example, the difference in their grayscale values ​​is greater than or equal to 25.

[0285] Optionally, the first marking portion 150 and the second marking portion 152 can be distinguished, and the distinguishing methods include, but are not limited to, color, pattern, imprint depth, or other distinguishable and identifiable methods. For example, the first marking portion 150 and the second marking portion 152 have different colors and their grayscale values ​​differ; for example, the first marking portion 150 and the second marking portion 152 have different patterns, one being "-" and the other being "+".

[0286] In some embodiments, an information pattern 16 for indicating parameter information of the battery cell 10 is also provided on the outer side of the first wall 110. The information pattern 16 can be a QR code etched on the first wall 110. By scanning the QR code, relevant information of the battery cell 10 can be obtained.

[0287] The insulating substrate 151 has a through hole 1510, which is provided corresponding to the information pattern 16 so as to expose the information pattern 16. The insulating member 15 also includes a transparent portion 153, which is connected to the insulating substrate 151 and closes the through hole 1510.

[0288] Compared to the approach of setting the markings or information patterns on the surface of the first wall 110 and exposing the markings or information patterns by opening windows in the insulating member 15, the battery cell 10 provided in some embodiments of this application can effectively improve the surface insulation performance of the battery cell 10, reduce the risk of short circuits caused by creepage problems on the surface of the battery cell 10, thereby improving the reliability of the battery cell 10 and making the battery device 100 have higher reliability.

[0289] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, wherein, include: The outer shell has a first wall; Electrode assembly, disposed within the housing; A first electrode terminal and a second electrode terminal with opposite polarities are disposed on the first wall and arranged at intervals along a first direction, the first direction intersecting the thickness direction of the first wall; An insulating element is disposed on the side of the first wall opposite to the electrode assembly, along the thickness direction of the first wall. The insulating element includes a first marking portion for indicating the polarity of the first electrode terminal.

2. The battery cell according to claim 1, wherein, The insulating component further includes an insulating substrate, and the first marking portion is disposed on the insulating substrate, wherein the first marking portion and the insulating substrate are different in color.

3. The battery cell according to claim 2, wherein, Along the thickness direction of the first wall, the first marking portion is disposed on the side of the insulating substrate opposite to the first wall.

4. The battery cell according to claim 2 or 3, wherein, The difference between the gray value of the first marking part and the gray value of the insulating substrate is greater than or equal to 25.

5. The battery cell according to any one of claims 2-4, wherein, The first marking portion includes a coating disposed on the surface of the insulating substrate.

6. The battery cell according to any one of claims 1-5, wherein, The first marking portion includes a first imprint disposed on the side of the insulating member opposite to the first wall.

7. The battery cell according to any one of claims 1-6, wherein, The insulating component has a first central axis parallel to the first direction, and along the second direction, the distance between the center of the first marking portion and the first central axis is no greater than 10 mm, and the first direction, the second direction and the thickness direction of the first wall are perpendicular to each other.

8. The battery cell according to claim 7, wherein, Along the second direction, the distance between the center of the first marking portion and the first central axis is no greater than 5mm.

9. The battery cell according to any one of claims 1-8, wherein, Along the first direction, the first marking portion is located on the side of the first electrode terminal opposite to the second electrode terminal.

10. The battery cell according to claim 9, wherein, Along the first direction, the first wall has a first side, the first marking portion is located between the first side and the first electrode terminal, and the minimum distance between the first side and the first marking portion is not less than 5 mm and not more than 50 mm.

11. The battery cell according to any one of claims 1-10, wherein, The insulating element further includes a second marking portion, which is used to indicate the polarity of the second electrode terminal.

12. The battery cell according to claim 11, wherein, The pattern represented by the first marking part is different from the pattern represented by the second marking part.

13. The battery cell according to claim 11 or 12, wherein, Along the first direction, the first marking portion is located on the side of the first electrode terminal opposite to the second electrode terminal, and the second marking portion is located on the side of the second electrode terminal opposite to the first electrode terminal.

14. The battery cell according to any one of claims 1-13, wherein, Along the thickness direction of the first wall, an information pattern is provided on the side of the first wall opposite to the electrode assembly. The information pattern includes at least one of barcode, QR code and text.

15. The battery cell according to claim 14, wherein, The insulating element includes a transparent portion that covers the information pattern.

16. The battery cell according to claim 15, wherein, The insulating component further includes an insulating substrate, the insulating substrate having a through hole, and the transparent portion being connected to the insulating substrate and sealing the through hole.

17. The battery cell according to claim 16, wherein, The minimum distance between the information pattern and the wall of the through hole is greater than or equal to 0.5 mm.

18. The battery cell according to claim 16 or 17, wherein, The minimum distance between the wall of the through hole and the edge of the insulating substrate is greater than or equal to 1 mm.

19. The battery cell according to any one of claims 1-18, wherein, The capacity of the battery cell is greater than or equal to 500Ah.

20. The battery cell according to claim 19, wherein, The outer casing is a square casing. The dimension of the outer casing in the first direction is W1, the dimension in the second direction is T1, and the dimension in the third direction is H1, satisfying 3720cm. 3 ≤W1*T1*H1≤12500cm 3 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm, and the first direction, the second direction, and the third direction are mutually perpendicular.

21. The battery cell according to any one of claims 1-20, wherein, The outer shell is made of steel.

22. A battery device, wherein, Includes the battery cell as described in any one of claims 1-21.

23. An electrical appliance, wherein, Includes the battery cell according to any one of claims 1-21, and / or the battery device according to claim 22, wherein the battery cell is used to provide electrical energy.

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