Battery monomer, battery and electric equipment

Abstract

The embodiment of the utility model provides a battery monomer, a battery and electric equipment, the battery monomer comprises a shell, an end cover, an electrolyte, an electrode assembly and a blocking piece, and the shell is provided with a first opening; the end cover covers the first opening, and the end cover and the shell are connected in a sealed mode to form a connecting part. The electrolyte is arranged in the shell; the electrode assembly is arranged in the shell; and the blocking piece is connected with the end cover and the shell and is positioned on one side, facing the interior of the battery monomer, of the connecting part.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] Batteries are widely used in portable electronic devices, electric vehicles, electric tools, drones, energy storage devices, etc. How to improve the reliability of battery cells and batteries is an urgent problem to be solved in battery technology. Utility Model Content

[0004] The present application provides a battery cell, a battery and an electrical device, which can improve the reliability of the battery cell and the battery.

[0005] This application is achieved through the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a battery cell, comprising a shell, an end cover, an electrolyte, an electrode assembly and a blocking member, wherein the shell has a first opening; the end cover covers the first opening, and the end cover and the shell are sealed and connected to form a connecting portion; the electrolyte is disposed in the shell; the electrode assembly is disposed in the shell; the blocking member connects the end cover and the shell, and is located on the side of the connecting portion facing the interior of the battery cell.

[0007] According to the battery cell of the embodiment of the present application, the blocking member connects the end cover and the shell and is located on the side of the connecting portion facing the interior of the battery cell. Therefore, the probability of the electrolyte contacting the connecting portion can be reduced to a certain extent, or at least a part of the connecting portion is prevented from contacting the electrolyte, effectively alleviating the problem of corrosion of the connecting portion by the electrolyte, thereby improving the reliability of the connecting portion, reducing the risk of electrolyte leakage, and further improving the reliability of the battery cell and the battery.

[0008] According to some embodiments of the present application, the end cover has a first connecting surface, the shell has a second connecting surface, and the first connecting surface and the second connecting surface are arranged opposite to each other and connected to form the connecting portion.

[0009] In the above scheme, at least part of the blocking member is arranged between the first connecting surface and the second connecting surface, thereby reducing the probability of the electrolyte entering between the first connecting surface and the second connecting surface, so that at least part of the connecting part is not in contact with the electrolyte, effectively alleviating the problem of corrosion of the connecting part by the electrolyte, thereby improving the reliability of the connecting part, reducing the risk of electrolyte leakage, and further improving the reliability of the battery cell and the battery.

[0010] According to some embodiments of the present application, the portion of the blocking member disposed between the first connecting surface and the second connecting surface is an annular structure extending along the circumference of the end cover.

[0011] In the above scheme, since the connecting part is an annular structure, the portion of the blocking member arranged between the first connecting surface and the second connecting surface is an annular structure extending along the circumference of the end cover, which can block the electrode liquid from moving toward the connecting part in all directions, further reducing the probability of the electrolyte contacting the connecting part, thereby ensuring the reliability of the connecting part and reducing the risk of electrolyte leakage.

[0012] According to some embodiments of the present application, the end cover has a first side surface facing the interior of the battery cell and a second side surface away from the interior of the battery cell, and a first outer peripheral surface connecting the first side surface and the second side surface, and the first connecting surface is the first outer peripheral surface; the shell has an inner peripheral surface facing the interior of the battery cell, and a portion of the inner peripheral surface forms the second connecting surface.

[0013] In the above solution, at least part of the end cover extends into the shell, so that the first outer peripheral surface can be connected and fixed with the inner peripheral surface of the shell to form a connection portion. In this case, the first connection surface is the first outer peripheral surface of the end cover, and the second connection surface is a part of the inner peripheral surface of the shell.

[0014] According to some embodiments of the present application, the shell has a second outer peripheral surface facing away from the interior of the battery cell and an inner peripheral surface facing the interior of the battery cell, and an end surface connecting the inner peripheral surface and the second outer peripheral surface, the second connecting surface is the end surface, and the end cover has a first side surface facing the interior of the battery cell, and a portion of the first side surface forms the first connecting surface.

[0015] In the above solution, at least the portion of the end cap connected to the shell does not extend into the shell, but is directly connected and fixed to the end surface of the shell, thereby forming a connection portion. In this case, the end surface of the shell close to the opening is the second connection surface, and a portion of the side surface of the end cap close to the inside of the shell in the thickness direction (i.e., the first side surface of the end cap facing the inside of the battery cell) is the first connection surface.

[0016] According to some embodiments of the present application, a protrusion is formed on the first side surface, and the first connecting surface is arranged around the protrusion.

[0017] In the above scheme, when the end cover is installed to the shell, the protrusion can first extend into the interior of the shell, thereby achieving preliminary positioning of the end cover and the shell, ensuring that the installation position of the end cover and the shell is accurate, and the end cover can be fixed on the shell more stably.

[0018] It can be understood that a portion of the first side surface may protrude toward the interior of the battery cell to form the above-mentioned protrusion.

[0019] According to some embodiments of the present application, a portion of the blocking member is disposed between the protrusion and the inner circumferential surface of the shell.

[0020] In the above scheme, a portion of the blocking member extends between the first connecting surface and the second connecting surface, and at the same time, a portion of the blocking member is also arranged between the protrusion and the inner circumferential surface of the shell. Therefore, not only the portion of the blocking member located between the first connecting surface and the second connecting surface can block the electrolyte from contacting the connecting part, but the portion of the blocking member between the protrusion and the inner circumferential surface of the shell can also block the electrolyte from contacting the connecting part, thereby further reducing the probability of the electrolyte contacting the connecting part, thereby ensuring the reliability of the connecting part and reducing the risk of electrolyte leakage.

[0021] According to some embodiments of the present application, the shell has an end face, the end cover has a third side face facing the interior of the battery cell and staggered with the end face along the thickness direction of the end cover, and the first connecting surface is arranged around the third side face; the blocking member includes a first part and a second part connected to each other, the first part is arranged between the first connecting surface and the second connecting surface, and the second part covers at least a part of the first side face.

[0022] In the above scheme, the blocking member not only extends between the first connecting surface and the second connecting surface, but also covers a portion of the third side surface, so that the blocking member is more firmly attached, and the ability of the blocking member to block the electrolyte is further enhanced, reducing the probability of the electrolyte contacting the connecting part.

[0023] It should be noted that, in the solution where the first outer peripheral surface of the end cap is configured as the first connection surface and is connected to a part of the inner peripheral surface of the shell to form a connection portion, the third side surface is the first side surface on the end cap facing the inside of the battery cell; in the solution where the end surface of the shell is configured as the second connection surface, a part of the first side surface is the first connection surface and cooperates with the second connection surface to form a connection portion, another part of the first side surface is the third side surface. In some embodiments of the present application, the outer peripheral portion of the first side surface is the first connection surface, and the middle area of ​​the first side surface is the third side surface, that is, the first connection surface is arranged around the outer periphery of the third side surface.

[0024] According to some embodiments of the present application, the blocking member covers the entire third side surface.

[0025] In the above solution, when the battery cell is inverted, the third side surface will not contact the electrolyte, further reducing the risk of corrosion of the end cap. At the same time, the circumference of the blocking member can be completely connected to the inner circumference of the shell, so that the gap between the inner circumference of the shell and the end cap is closed toward the inner end of the battery cell, reducing the probability of the electrolyte entering the gap, thereby improving the sealing performance of the battery cell.

[0026] According to some embodiments of the present application, the second part includes a main body and a thickened portion, the thickened portion is arranged around the outer periphery of the main body, and the thickened portion is connected to the inner circumferential surface; along the thickness direction of the end cover, the maximum thickness of the thickened portion is greater than the maximum thickness of the main body.

[0027] In the above solution, after the end cap is connected to the shell, the second part can ensure that the third side has better blocking ability and corrosion resistance, thereby reducing the probability of the end cap being corroded by the electrolyte. At the same time, the thickness of the thickened portion close to the inner circumference is larger, which can further isolate the electrolyte from the third side, further reducing the probability of the end cap being corroded by the electrolyte.

[0028] The initial barrier material on the third side surface can be melted after the battery cell is heated, and the thickened portion is formed after the initial barrier material on the third side surface is melted and moved to the inner circumference. It can be understood that before the battery cell is heated, the thickness of the initial barrier material close to the inner circumference is greater than the thickness of the thickened portion.

[0029] When the end cover is facing downward, the electrolyte in the shell can be blocked not only by the second part covering the third side, but also by the fixed connection area between the end cover and the shell, thereby achieving secondary sealing, reducing the risk of electrolyte leakage, and improving the sealing of the battery cell.

[0030] According to some embodiments of the present application, the thickened portion has a first side connected to the main body portion and a second side connected to the first portion, and the thickness of the thickened portion gradually increases from the first side to the second side.

[0031] In the above scheme, the gradually thickened portion can gradually enhance the barrier performance of the second portion near the first portion, ensuring that the edge area of ​​the third side has sufficient barrier performance, further reducing the risk of the end cover being corroded by the electrolyte.

[0032] According to some embodiments of the present application, the maximum thickness of the thickened portion is t and satisfies: 0mm<t≤3mm.

[0033] In the above solution, on the one hand, it can ensure that the area of ​​the second part close to the first part has sufficient blocking performance, while also ensuring that the thickness of the area of ​​the second part close to the first part is not too large to have a negative impact on the energy density of the battery cell.

[0034] According to some embodiments of the present application, at least a portion of the edge region of the third side surface is configured as a guide slope.

[0035] In the above scheme, when the end cover is on the lower side of the battery cell and the battery cell is heated, the barrier material initially located on the third side melts, and the molten barrier material on the third side can flow downward through the guide slope under the action of gravity and move to between the first connecting surface and the second connecting surface.

[0036] It should be noted that, in the scheme where the first outer peripheral surface of the end cover is constructed as the first connecting surface and is connected to a part of the inner peripheral surface of the shell to form a connecting portion, the molten barrier material on the third side surface can flow to the first connecting surface and the second connecting surface through the guide bevel; in the scheme where the end surface of the shell is constructed as the second connecting surface and a part of the first side surface is the first connecting surface that cooperates with the second connecting surface, at least a part of the first side surface protrudes toward the interior of the battery cell to form a protrusion, the guide bevel can be the circumferential surface of the protrusion, and the molten barrier material on the third side surface can first enter the gap between the protrusion or the guide bevel and the inner peripheral surface of the shell, and then penetrate into between the first connecting surface and the second connecting surface through the guide bevel.

[0037] According to some embodiments of the present application, the included angle between the guiding inclined surface and the first connecting surface is an obtuse angle.

[0038] In the above scheme, on the one hand, it is ensured that the molten barrier material can flow relatively smoothly, so that the barrier can flow more stably between the first connecting surface and the second connecting surface, and the gap between the first connecting surface and the second connecting surface can be better sealed. On the other hand, it is ensured that the molten barrier material has a sufficient flow speed, thereby improving the efficiency of the barrier flowing between the first connecting surface and the second connecting surface.

[0039] According to some embodiments of the present application, the guide slope is arranged around the end cover to form an annular area.

[0040] In the above solution, when the battery cell is heated, the barrier material initially located on the third side surface can be more evenly moved between the first connection surface and the second connection surface, thereby forming the barrier member of the present application, and improving the sealing performance between the end cover and the shell. The guide slope can surround the coating area, and can further reduce the material of the end cover, thereby reducing the manufacturing cost of the end cover.

[0041] According to some embodiments of the present application, a first groove is provided in the edge region of the third side surface, one end of the first groove extends to the first connecting surface, and at least a portion of the bottom wall of the first groove is configured as the guide slope.

[0042] In the above scheme, the first groove can introduce the molten barrier material on the third side into between the first connecting surface and the second connecting surface, and the first groove can store a certain amount of molten barrier material. Therefore, the area coated with the barrier material on the inner circumferential surface of the shell opposite to the first groove is higher than the other areas of the inner circumferential surface coated with the barrier material, thereby at least improving the sealing effect between the end cover and the shell to a certain extent.

[0043] The area on the inner circumference of the shell that is not facing the first groove has a gap connected to the first groove between it and the end cover, and the molten material flowing out of the first groove coats the area on the inner circumference of the shell that is not facing the first groove through the gap.

[0044] Since the edge area of ​​the third side surface is not entirely an inclined surface, the flow of the molten material is more concentrated, and the molten material is more likely to pass through the first groove to reach between the first connecting surface and the second connecting surface, thereby reducing the probability that the molten material is not easy to flow between the first connecting surface and the second connecting surface due to the overall large edge area of ​​the third side surface.

[0045] According to some embodiments of the present application, there are multiple first grooves, and the multiple first grooves are arranged at intervals along the circumference of the end cover.

[0046] In the above solution, after the barrier material is melted, the molten material on the coating area can flow evenly between the first connection surface and the second connection surface, thereby improving the sealing uniformity between the end cover and the inner circumferential surface of the shell. Of course, by providing a plurality of first grooves on the edge area of ​​the third side surface, the material used for the end cover can be further reduced, thereby reducing the manufacturing cost of the end cover.

[0047] According to some embodiments of the present application, the third side surface is further provided with a second groove, which is arranged at an end of the first groove away from the first connecting surface and is connected to the first groove.

[0048] In the above scheme, the initial barrier material can be stored in the second groove, and the thickness of the barrier material in the second groove is greater than the thickness of the barrier material in other areas of the third side. Therefore, after the battery cell is heated, the amount of melted barrier material in the second groove can support its flow to between the first connecting surface and the second connecting surface, ensuring good sealing performance between the end cover and the shell.

[0049] Of course, by providing the second groove, the material used for the end cover can be further reduced, thereby reducing the manufacturing cost of the end cover.

[0050] According to some embodiments of the present application, the second groove is an annular groove extending along the circumference of the third side surface.

[0051] In the above solution, the initial barrier material in the second groove can have a sufficient material amount after melting, and can then flow circumferentially between the first connecting surface and the second connecting surface, so that the sealing performance between the end cover and the shell is further improved.

[0052] According to some embodiments of the present application, the melting point of the barrier is greater than or equal to 85°C and less than or equal to 120°C.

[0053] In the above scheme, on the one hand, the barrier member can melt when the battery cell is heated, so that the molten barrier material can flow from the third side to between the first connecting surface and the second connecting surface, thereby performing secondary sealing on the shell and end cover of the battery cell; on the other hand, the barrier member will not cause the battery cell to melt during normal use due to its too low melting point, thereby improving the stability of the barrier member.

[0054] According to some embodiments of the present application, the blocking member includes one of paraffin wax, rosin, PE wax, polyolefin, stearic acid and white oil.

[0055] In the above solution, the barrier member can be melted after the battery cell is heated, and the melted barrier material can flow between the first connecting surface and the second connecting surface to perform secondary sealing on the end cover and the shell.

[0056] The blocking member may be made of a single material, which may be any one of the above-mentioned materials; of course, the blocking member may also be made of two or more of the above-mentioned multiple materials.

[0057] In the second aspect, the embodiment of the present application provides a battery, including the above-mentioned battery cell. Since the battery according to the embodiment of the present application is provided with the above-mentioned battery cell, the end cap of the battery has a stronger corrosion resistance, effectively reducing the risk of the end cap being corroded by the electrolyte, and also reducing the risk of electrolyte leakage in the battery.

[0058] According to some embodiments of the present application, the end cap is located below the shell along the direction of gravity. Therefore, when the battery cell is inverted and baked at high temperature, the molten barrier material can flow to the side of the connection part facing the inside of the battery cell under the action of gravity, thereby reducing the probability of the electrolyte contacting the connection part.

[0059] In a third aspect, the present application provides an electric device, including the above-mentioned battery cell or the above-mentioned battery. Since the electric device according to the present application is provided with the above-mentioned battery cell or battery, the power supply stability of the electric device is improved.

[0060] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0062] Figure 1 A schematic diagram of a vehicle provided in an embodiment of the present application;

[0063] Figure 2 An exploded view of a battery provided in an embodiment of the present application;

[0064] Figure 3 An exploded view of a battery cell provided in an embodiment of the present application;

[0065] Figure 4 A front view of an end cap assembly (not assembled to a housing) provided in an embodiment of the present application;

[0066] Figure 5 A side view of an end cap assembly (not assembled to a housing) provided in an embodiment of the present application;

[0067] Figure 6 A front view of an end cap assembly provided in an embodiment of the present application;

[0068] Figure 7 A side view of an end cap assembly provided in an embodiment of the present application;

[0069] Figure 8 A side view of an end cap assembly provided in another embodiment of the present application;

[0070] Fig. 9 A side view of an end cap assembly provided in yet another embodiment of the present application;

[0071] Fig.10 A side view of an end cap provided in an embodiment of the present application;

[0072] Fig.11 for Fig.10 The enlarged partial view provided by A is circled;

[0073] Fig.12 A cross-sectional view of a battery cell provided in an embodiment of the present application;

[0074] Fig.13 for Fig.12 The enlarged schematic diagram of the part B is circled;

[0075] Fig.14 A schematic diagram of the cooperation between the end cover and the housing provided in one embodiment of the present application;

[0076] Fig.15 for Fig.14 The enlarged partial view of F is circled;

[0077] Fig.16 A schematic diagram of the cooperation between the end cover and the housing provided in another embodiment of the present application;

[0078] Fig.17 for Fig.16 The enlarged partial view of G is circled;

[0079] Fig.18 A schematic diagram of the cooperation between the end cover and the housing provided in yet another embodiment of the present application;

[0080] Fig.19 for Fig.18 The enlarged partial view of H is circled;

[0081] Fig. 20 A schematic diagram of the cooperation between the end cover and the housing provided in yet another embodiment of the present application;

[0082] Fig.21 for Fig. 20 The enlarged partial view of C is circled;

[0083] Fig. 22 A schematic diagram of the cooperation between the end cover and the housing provided in yet another embodiment of the present application;

[0084] Fig.23 for Fig. 22 The enlarged partial view of D is circled;

[0085] Fig.24 A schematic diagram of the cooperation between the end cover and the housing provided in yet another embodiment of the present application;

[0086] Fig.25 for Fig.24 The enlarged partial view of E is circled;

[0087] Fig.26 A schematic diagram of the cooperation between the end cover and the housing provided in yet another embodiment of the present application;

[0088] Fig. 27 for Fig.26 The enlarged partial view of J is circled;

[0089] Fig.28 Flow chart of a method for manufacturing a battery cell according to an embodiment of the present application.

[0090] Icons: vehicle 1000, battery 100, controller 200, motor 300, housing 10, battery cell 20, first sub-housing 11, second sub-housing 12, housing 21, electrode assembly 22, electrode terminal 25, housing 211, connecting portion 211c, end cap assembly 212, end cap 212a, protrusion 212a1, blocking member 212b, first portion 212c1, second portion 212c2, third portion 212c3 , first side 101, coating area 101a, blank area 101b, third side 101c, second side 102, first outer peripheral surface 103, main body 212b1, thickened portion 212b2, first side a, second side b, guide slope 108, first groove 104a, second groove 104b, first opening 106, inner peripheral surface 107, end face 105, second outer peripheral surface 109, first connecting surface M1, second connecting surface M2. DETAILED DESCRIPTION

[0091] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0092] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0093] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0094] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0095] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0096] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0097] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0098] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0099] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0100] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0101] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0102] The battery cells may be, but are not limited to, lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, etc.

[0103] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0104] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0105] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0106] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, 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., may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may 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.).

[0107] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0108] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0109] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, 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. may be used.

[0110] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0111] As an example, the negative electrode active material may adopt the negative electrode active material for the battery known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials and lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0112] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0113] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

[0114] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0115] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0116] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0117] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0118] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0119] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0120] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, and the like.

[0121] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0122] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0123] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0124] In some embodiments, the electrode assembly is a laminate structure.

[0125] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0126] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap closes the opening to form a closed space for accommodating substances such as the electrode assembly and the electrolyte. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0127] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab of the electrode assembly. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through an adapter. The electrode terminal may be disposed on the end cap, or may be disposed on the housing.

[0128] In some embodiments, an explosion-proof valve is provided on the housing, and the explosion-proof valve is used to release the internal pressure of the battery cell.

[0129] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal prismatic battery, such as a hexagonal prismatic battery, etc. There is no particular limitation in the embodiments of the present application.

[0130] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0131] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0132] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0133] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0134] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0135] Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and small self-discharge coefficient. They are an important part of the development of new energy today.

[0136] The development of battery technology must take into account multiple design factors at the same time, such as performance parameters such as energy density, discharge capacity, charge and discharge rate, and also the assembly efficiency of the battery.

[0137] Please refer to Figure 3 , Figure 3 An exploded view of a battery cell provided in some embodiments of the present application. Figure 3 As shown, the battery cell 20 includes a housing 21, an electrode assembly 22 and an electrode terminal 25. The housing 21 includes a shell 211 and an end cap assembly 212. The shell 211 has an opening, and the end cap assembly 212 closes the opening to isolate the internal environment of the battery cell 20 from the external environment.

[0138] The shell 211 is a component used to cooperate with the end cap assembly 212 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22, the electrolyte and other components. The shell 211 and the end cap assembly 212 can be independent components. The shell 211 can be of various shapes and sizes. Specifically, the shape of the shell 211 can be determined according to the specific shape and size of the electrode assembly 22. The material of the shell 211 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0139] The end cap assembly 212 refers to a component that covers the opening of the shell 211 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap assembly 212 can be adapted to the shape of the shell 211 to match the shell 211. Optionally, the end cap assembly 212 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap assembly 212 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and reliability can also be improved. Functional components such as electrode terminals can be provided on the end cap assembly 212. The electrode terminal can be used to electrically connect to the electrode assembly 22 for outputting or inputting electrical energy of the battery cell 20. The material of the end cap assembly 212 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating structure may be provided inside the end cap assembly 212, and the insulating structure may be used to isolate the electrical connection components in the housing 211 from the end cap assembly 212 to reduce the risk of short circuit. For example, the insulating structure may be plastic, rubber, or the like.

[0140] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be included in the housing 211. The electrode assembly 22 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet, and the separator is used to separate the positive electrode sheet and the negative electrode sheet to avoid short circuits between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a pole ear. The positive pole ear and the negative pole ear may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the pole ears connect the electrode terminals to form a current loop.

[0141] The end cover is generally fixed on the shell to seal the opening on the shell, so that the internal space of the shell is isolated from the external space, and the internal space of the shell forms a relatively closed space.

[0142] During the use of some batteries, it is necessary to assemble and use the battery cells upside down according to the customer's group assembly optimization requirements, and the end cap is located at the bottom. At this time, the side of the end cap facing the inside of the battery cell can directly contact the electrolyte, so the electrolyte may corrode the end cap, and even cause leakage of the shell due to corrosion by the electrolyte.

[0143] In addition, since the end cover is fixedly connected to the shell, there is a fixed connection area between the end cover and the shell. When the end cover is located below the battery cell and the fixed connection area fails, the probability of electrolyte leakage increases.

[0144] The leakage of a single battery cell will affect the performance of the battery cell, but will not have much impact on its own safety. However, combined with the system structure of the battery module or battery pack, after the electrolyte leaks, when there is a high-voltage circuit in a part of the system, there is a risk of electrolyte ignition and thermal runaway.

[0145] To this end, the present application proposes a battery cell, which can alleviate the problem of corrosion of the end cover and improve the sealing of the battery.

[0146] The battery cell 20 according to the embodiment of the present application may include a housing 211 , an end cover 212 a , an electrode solution, an electrode assembly 22 , and a blocking member 212 b .

[0147] like Figure 3 , Figure 6-Figure 27 As shown, the housing 211 has a first opening 106, and the electrode assembly 22 can be installed in the accommodation space of the housing 211 through the first opening 106. Of course, after the end cap 212a is connected to the housing 211, the electrode liquid can also be injected into the interior of the housing.

[0148] The end cover 212a may be made of a material with relatively high strength, for example, the end cover 212a may be a metal part, and similarly, the housing 211 may also be a metal part.

[0149] The end cap 212a can cover the first opening 106, so that the end cap 212a can close the first opening 106, and the end cap 212a and the shell 211 together enclose a space isolated from the outside, and the electrode assembly 22 and the electrolyte can be arranged in the space.

[0150] The end cover 212a may be sealed and connected to the shell 211 to form a connection portion 211c. The end cover 212a may be fixedly connected to the shell 211, so that the connection portion 211c may be a fixed connection area formed after the end cover 212a is fixed to the shell 211.

[0151] For example, the end cover 212a can be welded and fixed to the shell 211, so that the connecting portion 211c is a weld between the end cover 212a and the shell 211; or the end cover 212a can be adhesively fixed to the shell 211, so that the connecting portion 211c is an adhesive between the end cover 212a and the shell 211.

[0152] The blocking member 212b may be an insulating member, or may not be an insulating member, as long as it can at least block the electrolyte from entering the connecting portion 211c to a certain extent.

[0153] The blocking member 212 b connects the end cover 212 a and the housing 211 , and is located on a side of the connecting portion 211 c facing the inside of the battery cell 20 .

[0154] That is, there is a gap between the end cover 212a and the housing 211, and even if the gap is small, the blocking member 212b can enter the gap between the end cover 212a and the housing 211. The electrolyte can be blocked from contacting the connecting portion 211c to a certain extent, thereby reducing the risk of corrosion of the connecting portion 211c.

[0155] According to the battery cell 20 of the embodiment of the present application, the blocking member 212b is connected to the end cover 212a and the housing 211, and is located on the side of the connecting portion 211c facing the inside of the battery cell 20. Therefore, the probability of the electrolyte contacting the connecting portion 211c can be reduced to a certain extent, or at least part of the connecting portion 211c is prevented from contacting the electrolyte, effectively alleviating the corrosion problem of the electrolyte on the connecting portion 211c, thereby improving the reliability of the connecting portion 211c, reducing the risk of electrolyte leakage, and further improving the reliability of the battery cell 20 and the battery.

[0156] In some embodiments of the present application, the end cover 212a has a first connection surface M1, the housing 211 has a second connection surface M2, and the first connection surface M1 and the second connection surface M2 are arranged opposite to each other and connected to form a connection portion 211c. For example, at least part of the first connection surface M1 and the second connection surface M2 can be welded and fixed to form the connection portion 211c.

[0157] The end cover 212a may be generally a plate-shaped structure.

[0158] At least a portion of the blocking member 212 b is disposed between the first connection surface M1 and the second connection surface M2 , and is located on a side of the connection portion 211 c facing the interior of the battery cell 20 .

[0159] That is to say, there is inevitably a gap between the first connecting surface M1 and the second connecting surface M2 (even if the gap is small, the gap still exists), so at least a portion of the blocking member 212b is arranged between the first connecting surface M1 and the second connecting surface M2, which can block the contact between the electrolyte and the connecting portion 211c to a certain extent, thereby reducing the risk of corrosion of the connecting portion 211c.

[0160] At least a portion of the blocking member 212b is disposed between the first connecting surface M1 and the second connecting surface M2, thereby reducing the probability of the electrolyte contacting the connecting portion 211c to a certain extent, or preventing at least a portion of the connecting portion 211c from contacting the electrolyte, thereby effectively alleviating the problem of corrosion of the connecting portion 211c by the electrolyte, thereby improving the reliability of the connecting portion 211c, reducing the risk of electrolyte leakage, and further improving the reliability of the battery cell 20 and the battery.

[0161] In some embodiments of the present application, the end cover 212a and the shell 211 may be fixed together by welding. There is a welding area between the end cover 212a and the shell 211, and the end cover 212a and the shell 211 may be fixedly connected through the welding area.

[0162] The end cover 212a and the shell 211 may be fixed together by bonding. There is a bonding area between the end cover 212a and the shell 211, and the end cover 212a and the shell 211 may be fixedly connected through the bonding area.

[0163] Of course, the end cover 212a and the shell 211 of the embodiment of the present application can be fixedly connected by other means, which is not limited in the present application.

[0164] It should be noted that the above-mentioned welding area or bonding area can fix the end cover 212a and the shell 211 together, or in other words, the end cover 212a and the shell 211 are mainly fixed together through the welding area or bonding area, and the above-mentioned welding area or bonding area can be referred to as the connecting part 211c.

[0165] According to some embodiments of the present application, at least a portion of the blocking member 212b is disposed between the first connecting surface M1 and the second connecting surface M2, and the portion of the blocking member 212b disposed between the first connecting surface M1 and the second connecting surface M2 is an annular structure that extends along the circumference of the end cover 212a.

[0166] Since the connecting portion 211c is an annular structure, the portion of the blocking member 212b disposed between the first connecting surface M1 and the second connecting surface M2 is an annular structure extending along the circumference of the end cover 212a, which can block the electrode liquid from moving toward the connecting portion 211c in all directions, further reducing the probability of the electrolyte contacting the connecting portion 211c, thereby ensuring the reliability of the connecting portion 211c and reducing the risk of electrolyte leakage.

[0167] According to some embodiments of the present application, Figure 14-Figure 19 As shown, the end cover 212a has a first side surface 101 facing the interior of the battery cell 20 and a second side surface 102 away from the interior of the battery cell 20, and a first outer peripheral surface 103 connecting the first side surface 101 and the second side surface 102, and the first connecting surface M1 is the first outer peripheral surface 103; the shell 211 has an inner peripheral surface 107 facing the interior of the battery cell 20, and a portion of the inner peripheral surface 107 forms a second connecting surface M2.

[0168] Along the thickness direction of the end cover 212a, the end cover 212a has a first side surface 101 and a second side surface 102, the first side surface 101 faces the interior of the housing 211, and the second side surface 102 faces away from the interior of the housing 211. That is, after the battery cell 20 is assembled, the first side surface 101 is the inner side surface of the end cover 212a, and the second side surface 102 is the outer side surface of the end cover 212a.

[0169] Thus, at least part of the end cover 212a extends into the interior of the housing 211, so that the first outer peripheral surface 103 can be connected and fixed with the inner peripheral surface 107 of the housing 211, thereby forming a connecting portion 211c. At this time, the first connecting surface M1 is the first outer peripheral surface 103 of the end cover 212a, and the second connecting surface M2 is a part of the inner peripheral surface 107 of the housing 211.

[0170] According to some embodiments of the present application, Figure 20-Figure 25As shown, the shell 211 has a second outer peripheral surface 109 facing away from the interior of the battery cell 20 and an inner peripheral surface 107 facing the interior of the battery cell 20, and an end surface 105 connecting the inner peripheral surface 107 and the second outer peripheral surface 109, the second connecting surface M2 is the end surface 105, and the end cover 212a has a first side surface 101 facing the interior of the battery cell 20, and a portion of the first side surface 101 forms a first connecting surface M1.

[0171] At least the portion of the end cap 212a connected to the housing 211 does not extend into the interior of the housing 211, but is directly connected and fixed to the end face 105 of the housing 211, thereby forming a connection portion 211c. At this time, the end face 105 of the housing 211 close to the opening 106 is the second connection face M2, and a portion of the first side face 101 is the first connection face M1. In other words, the portion of the side face of the end cap 211 close to the interior of the housing 211 in the thickness direction and opposite to the end face 105 is the first connection face M1.

[0172] According to some embodiments of the present application, Figure 14-Figure 25 As shown, the end cover 212 a has a first outer peripheral surface 103 and a second side surface 102 facing away from the interior of the battery cell 20 , and the first outer peripheral surface 103 connects the first connecting surface M1 and the second side surface 102 .

[0173] That is, the first connection surface M1 and the second side surface 102 can be arranged opposite to each other in the thickness direction of the end cover 212a, the first outer peripheral surface 103 connects the second side surface 102 and the first connection surface M1, and the first connection surface M1 is fixedly connected to the end surface 105 of the shell 211.

[0174] According to some embodiments of the present application, Figure 26-Figure 27 As shown, a protrusion 212a1 is formed on one side of the end cover 212a facing the inside of the battery cell 20, and the first connection surface M1 is arranged around the protrusion 212a1.

[0175] In the above scheme, when the end cover 212a is installed to the shell 211, the protrusion 212a1 can first extend into the interior of the shell 211, so as to achieve the initial positioning of the end cover 212a and the shell 211, ensure the accurate installation position of the end cover 212a and the shell 211, and the end cover 212a can be more stably fixed on the shell 211.

[0176] It can be understood that a portion of the first side surface 101 may protrude toward the inside of the battery cell 20 to form the above-mentioned protruding portion 212 a 1 .

[0177] According to some embodiments of the present application, Fig. 27 As shown, a portion (third portion 212 c 3 ) of the blocking member 212 b is disposed between the protrusion 212 a 1 and the inner circumferential surface 107 of the housing 211 .

[0178] In the above scheme, a portion of the blocking member 212b extends between the first connecting surface M1 and the second connecting surface M2, and at the same time, a portion of the blocking member 212b is also arranged between the protrusion 212a1 and the inner circumferential surface 107 of the shell 211. Therefore, not only can the portion of the blocking member 212b located between the first connecting surface M1 and the second connecting surface M2 block the electrolyte from contacting the connecting portion 211c, but the portion of the blocking member 212b between the protrusion 212a1 and the inner circumferential surface 107 of the shell 211 can also block the electrolyte from contacting the connecting portion 211c, thereby further reducing the probability of the electrolyte contacting the connecting portion 211c, thereby ensuring the reliability of the connecting portion 211c and reducing the risk of electrolyte leakage.

[0179] According to some embodiments of the present application, Figure 14-Figure 25 As shown, the shell 211 has an end face 105, the end cover 212a has a third side face 101c facing the interior of the battery cell 20 and staggered with the end face 105 along the thickness direction of the end cover 212a, and the first connecting surface M1 is arranged around the third side face 101c; the blocking member 212b includes a first part 212c1 and a second part 212c2 connected to each other, the first part 212c1 is arranged between the first connecting surface M1 and the second connecting surface M2, and the second part 212c2 covers at least a part of the first side face 101.

[0180] In the above solution, the blocking member 212b not only extends between the first connecting surface M1 and the second connecting surface M2, but also covers a portion of the third side surface 101c, so that the blocking member 212b is more firmly attached, and the ability of the blocking member 212b to block the electrolyte is further enhanced, reducing the probability of the electrolyte contacting the connecting portion 211c.

[0181] In addition, since the blocking member 212b covers at least a portion of the third side surface 101c, the probability of the electrode liquid contacting the end cover 212a is reduced, thereby alleviating the problem of corrosion of the end cover 212a by the electrolyte.

[0182] The first connection surface M1 is disposed around the third side surface 101c. In this case, the first connection surface M1 may be coplanar with the third side surface 101c. Of course, the first connection surface M1 may also form a certain angle with the first side surface 101. For example, the first connection surface M1 is perpendicular to the first side surface 101.

[0183] It should be noted that, in the scheme where the first outer peripheral surface 103 of the end cover 212a is configured as the first connection surface M1 and is connected to a portion of the inner peripheral surface 107 of the shell 211 to form the connection portion 211c, the third side surface 101c is the first side surface 101 on the end cover 212a facing the inside of the battery cell 20; in the scheme where the end surface 105 of the shell 211 is configured as the second connection surface M2, a portion of the first side surface 101 is the first connection surface M1 and cooperates with the second connection surface M2 to form the connection portion 211c, another portion of the first side surface 101 is the third side surface 101c. In some embodiments of the present application, the outer peripheral portion of the first side surface 101 is the first connection surface M1, and the middle area of ​​the first side surface 101 is the third side surface 101c, that is, the first connection surface M1 is arranged around the outer periphery of the third side surface 101c.

[0184] According to some embodiments of the present application, Figure 16-Figure 19 , Figure 22-Figure 25 As shown, the blocking member 212 b covers the entire third side surface 101 .

[0185] In the above solution, when the battery cell 20 is inverted, the third side surface 101c will not contact the electrolyte, further reducing the risk of corrosion of the end cap 212a. At the same time, the circumference of the blocking member 212b can be completely connected to the inner circumference 107 of the shell 211, so that the gap between the inner circumference 107 of the shell 211 and the end cap 212a is closed toward the inner end of the battery cell 20, reducing the probability of the electrolyte entering the gap, thereby improving the sealing performance of the battery cell 20.

[0186] In some embodiments of the present application, the shell 211 further has an inner circumferential surface 107 facing the interior of the shell 211 (ie, the accommodating space), and the inner circumferential surface 107 can enclose the accommodating space of the shell 211 and the first opening 106 .

[0187] The inner circumferential surface 107 can be surrounded by the first side surface 101, that is, a portion of the end cover 212a can be located inside the shell 211, the end cover 212a may not cover the end surface 105 of the shell 211 close to the end cover 212a, the end surface of the shell 211 close to the end cover 212a can be exposed, and the entire area of ​​the first side surface 101 can be located inside the shell 211.

[0188] In some embodiments of the present application, the blocking member 212b covers at least a portion of the third side surface 101c, that is, a portion of the third side surface 101c may be covered with the blocking member 212b, or the entire third side surface 101c may be covered with the blocking member 212b.

[0189] Thus, the blocking member 212b can insulate at least a portion of the third side surface 101c. When the end cover 212a is located at the lower side of the battery cell 20, the contact area between the third side surface 101c and the electrolyte can be reduced, thereby reducing the risk of corrosion of the end cover 212a.

[0190] In some embodiments of the present application, a portion of the blocking member 212b can extend between the first connecting surface M1 and the second connecting surface M2, and a portion of the blocking member 212b can also contact the inner circumferential surface 107 of the shell 211 (the inner circumferential surface 107 is the portion that is not arranged opposite to the first connecting surface M1).

[0191] Thus, the contact probability between the electrolyte and the connection portion 211 c can be further reduced, the risk of the electrolyte corroding the connection portion 211 c can be reduced, and the risk of leakage of the battery cell 20 can be further reduced.

[0192] In addition, the fixed connection area between the end cap 212a and the housing 211 (ie, the connection portion 211c) is a primary seal, and the blocking member 212b connected to the inner circumferential surface 107 is a secondary seal, thereby improving the sealing effect of the battery cell 20 and reducing the probability of electrolyte leakage.

[0193] It is understandable that the blocking member 212b may extend into the gap between the first connection surface M1 and the second connection surface M2, and may even extend into the gap between the fixed connection area (connecting portion 211c) of the end cover 212a and the housing 211.

[0194] In some embodiments of the present application, the blocking member 212b also includes a third part 212c3, which can be fixed to the inner circumferential surface 107 of the shell 211. The molten blocking material can not only flow between the first connecting surface M1 and the second connecting surface M2, but also flow to the inner circumferential surface 107 of the shell 211.

[0195] According to some embodiments of the present application, Figure 6-Figure 9 As shown, the blocking member 212b covers the entire third side surface 101c. In other words, the entire area of ​​the third side surface 101c is covered by the blocking member 212b, and there is no exposed area of ​​the third side surface 101c.

[0196] Therefore, when the battery cell 20 is inverted, the third side surface 101c will not contact the electrolyte, further reducing the risk of corrosion of the end cap 212a. At the same time, the circumference of the blocking member 212b can be completely connected to the inner circumferential surface 107, so that the gap between the inner circumferential surface 107 and the end cap 212a is closed toward the inner end of the battery cell 20, reducing the probability of the electrolyte entering the gap, thereby improving the sealing performance of the battery cell 20.

[0197] In some embodiments of the present application, the melting point of the blocking member 212b is greater than or equal to 85° and less than or equal to 120°. For example, the melting point of the blocking member 212b may be 85°, 90°, 95°, 100°, 105°, 110°, 115° or 120°.

[0198] It should be noted that the melting points of the above-mentioned blocking member 212b are only some specific embodiments of the present application. As long as the melting point of the blocking member 212b meets the above-mentioned range, it is within the protection scope of the present application.

[0199] Since the melting point of the blocking member 212b satisfies the above range, after the end cover 212a is connected to the shell 211, on the one hand, the blocking member 212b can melt when the battery cell 20 is heated (baking), so that the molten blocking material can flow between the first connecting surface M1 and the second connecting surface M2, and even flow to the fixed connection area (i.e., the connecting portion 211c) of the shell 211 and the end cover 212a, thereby performing secondary sealing on the shell 211 and the end cover 212a of the battery cell 20. On the other hand, the blocking member 212b will not cause the battery cell 20 to melt during normal use due to its too low melting point, thereby improving the stability of the blocking member 212b.

[0200] In some embodiments of the present application, the melting point of the blocking member 212b is greater than or equal to 90° and less than or equal to 110°. For example, the melting point of the blocking member 212b may be 90°, 96°, 102°, 108°, or 110°.

[0201] It should be noted that the melting points of the above-mentioned blocking member 212b are only some specific embodiments of the present application. As long as the melting point of the blocking member 212b meets the above-mentioned range, it is within the protection scope of the present application.

[0202] Since the melting point of the blocking member 212b satisfies the above range, after the end cover 212a is connected to the shell 211, on the one hand, the blocking member 212b can be more easily melted when the battery cell 20 is heated (baking), so that the molten blocking material can more easily flow to between the first connecting surface M1 and the second connecting surface M2, and even flow to the fixed connection area (i.e., the connecting portion 211c) of the shell 211 and the end cover 212a, thereby performing secondary sealing on the shell 211 and the end cover 212a of the battery cell 20. On the other hand, the blocking member 212b will not cause the battery cell 20 to melt during normal use due to the low melting point when the melting point is low, thereby further improving the stability of the blocking member 212b.

[0203] In some embodiments of the present application, the barrier 212b may include one or more of paraffin, rosin, PE wax, polyolefin, stearic acid and white oil. Thus, the barrier 212b may melt after the battery cell 20 is heated, and the melted barrier material may flow between the first connection surface M1 and the second connection surface M2 to perform secondary sealing on the end cover 212a and the housing 211.

[0204] It can be understood that the blocking member 212b can be made of a single material, and the single material can be any one of the above-mentioned materials; of course, the blocking member 212b can also be composed of two or more of the above-mentioned multiple materials.

[0205] According to some embodiments of the present application, Figure 8-Figure 9 As shown, the second portion 212c2 includes a main body portion 212b1 and a thickened portion 212b2. The thickened portion 212b2 is arranged around the outer periphery of the main body portion 212b1, that is, the thickened portion 212b2 can extend along the circumference of the main body portion 212b1, and the thickened portion 212b2 is an annular structure surrounding the main body portion 212b1.

[0206] After the end cap 212a is connected to the housing 211, the second portion 212c2 can ensure that the first side 101 has better insulation and corrosion resistance, thereby reducing the probability of the end cap 212a being corroded by the electrolyte. At the same time, the thickened portion 212b2 located on the periphery of the main body 212b1 is thicker, which can further isolate the electrolyte from the third side 101c, further reducing the probability of the end cap 212a being corroded by the electrolyte.

[0207] The initial barrier material on the third side 101c can be melted after the battery cell 20 is heated, and the thickened portion 212b2 is formed after the initial barrier material on the third side 101c is melted and moves to between the first connecting surface M1 and the second connecting surface M2. It can be understood that before the battery cell 20 is heated, the thickness of the initial barrier material close to the first connecting surface M1 and the second connecting surface M2 is greater than the thickness of the thickened portion 212b2.

[0208] When the end cover assembly 212 is facing downward, the electrolyte in the shell 212 can not only be blocked by the second part 212c2 covering the third side 101c, but also by the fixed connection area between the end cover 212a and the shell 211, thereby achieving secondary sealing, reducing the risk of electrolyte leakage, and improving the sealing of the battery cell 20.

[0209] In some embodiments of the present application, Fig. 9As shown, the thickened portion 212b2 has a first side a and a second side b, the first side a is connected to the main body portion 212b1, and the second side b is connected to the first portion 212c1. From the first side a to the second side b, the thickness of the thickened portion 212b2 gradually increases.

[0210] As the name implies, the first side a is spaced apart from the second side b, thereby ensuring that the thickened portion 212b2 has a certain width.

[0211] From the first side a to the second side b, the thickness of the thickened portion 212b2 gradually increases, that is, the thickness of the thickened portion 212b2 close to the first part 212c1 is greater than the thickness of the thickened portion 212b2 far from the first part 212c1, that is, the closer the thickened portion 212b2 is to the first part 212c1, the thicker it is, thereby improving the insulation and isolation capabilities of the second part 212c2 close to the first part 212c1, so that the first side 101 can be better isolated from the electrolyte, reducing the ability of the end cover 212a to be corroded by the electrolyte, and improving the sealing of the battery cell 20.

[0212] The gradually thickened portion 212b2 can gradually enhance the barrier performance of the second portion 212c2 near the first portion 212c1, ensuring that the edge area of ​​the third side 101c has sufficient barrier performance, further reducing the risk of the end cover 212a being corroded by the electrolyte.

[0213] In some embodiments of the present application, Figure 8 As shown, the thickness of the thickened portion 212b2 is t, which satisfies: 0mm<t≤3mm. For example, the thickness of the thickened portion 212b2 can be 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, or 3mm.

[0214] The thickness of the above-mentioned thickened portion 212b2 is only some specific examples of the present application. As long as the thickness of the thickened portion 212b2 meets the above-mentioned range, it is within the protection scope of the present application.

[0215] Since the thickness of the thickened portion 212b2 meets the above range, it can be known that the thickness of the initial blocking material on the third side 101c close to the first connecting surface M1 and the second connecting surface M2 is larger, so that when the molten material is cooled after melting, the thickened portion 212b2 has sufficient thickness, and at the same time, the thickness of the thickened portion 212b2 will not be too large to affect the energy density of the battery cell 20.

[0216] Of course, the thickness of the thickened portion 212b2 meets the above conditions. On the one hand, it can ensure that the area of ​​the second part 212c2 close to the first part 212c1 has sufficient blocking performance, while also ensuring that the thickness of the area of ​​the second part 212c2 close to the first part 212c1 is not too large to have a negative impact on the energy density of the battery cell 20.

[0217] In some embodiments of the present application, the thickened portion 212b2 is arranged around the main body 212b1. That is, the entire area of ​​the circumferential edge of the second portion 212c2 is the thickened portion 212b2, and the annular thickened portion 212b2 can be connected to the circumference of the first portion 212c1. The circumferential sealing of the connection area between the end cover 212a and the housing 211 is improved, and the risk of the end cover 212a being corroded by the electrolyte is reduced.

[0218] The thickened portion 212b2 can improve the barrier performance of the entire circumferential area of ​​the second portion 212c2, further isolate the third side surface 101c from the electrolyte, and reduce the probability of contact between the electrolyte and the third side surface 101c, thereby reducing the risk of the end cover 212a being corroded by the electrolyte.

[0219] In some embodiments of the present application, Figure 10-13 As shown, the end cover 212a further has a second side surface 102, and the first side surface 101 and the second side surface 102 are arranged opposite to each other along the thickness direction of the end cover 212a.

[0220] The end cover 212 a further has a first outer peripheral surface 103 , and the first outer peripheral surface 103 can connect the first side surface 101 and the second side surface 102 together.

[0221] In some embodiments of the present application, at least a portion of an edge area of ​​the third side 101c is constructed as a guide bevel 108, that is, the guide bevel 108 is not on the same plane as other areas on the third side 101c, and the guide bevel 108 is not parallel to other areas on the third side 101c, but the guide bevel 108 is inclined compared to other areas on the third side 101c.

[0222] Therefore, when the end cover assembly 212 is at the lower side of the battery cell 20 and the battery cell 20 is heated, the barrier material initially located on the third side 101c melts, and the molten barrier material on the third side 101c can flow downward through the guide slope 108 under the action of gravity and move to between the first connecting surface M1 and the second connecting surface M2.

[0223] For example, the guide slope 108 has a first end away from the first outer peripheral surface 103 and a second end close to the first outer peripheral surface 103. If the second side surface 102 is a relatively flat plane as a whole, the distance between the guide slope 108 and the second side surface 102 gradually decreases from the first end to the second end.

[0224] In some embodiments of the present application, the guiding slope 108 may be a plane, or a curved surface, as long as the distance between the guiding slope 108 and the second side surface 102 gradually decreases from the first end to the second end.

[0225] In some embodiments of the present application, an angle between the guiding inclined surface 108 and the first outer peripheral surface 103 is an obtuse angle, that is, the guiding inclined surface 108 is inclined toward the second side surface 102 .

[0226] In the above scheme, on the one hand, it is ensured that the molten barrier material can flow relatively smoothly, so that the barrier 212b can flow more stably between the first connecting surface M1 and the second connecting surface M2, and the gap between the first connecting surface M1 and the second connecting surface M2 can be better blocked. On the other hand, it is ensured that the molten barrier material has a sufficient flow speed, thereby improving the efficiency of the barrier 212b flowing between the first connecting surface M1 and the second connecting surface M2.

[0227] It should be noted that, in the scheme where the first outer circumferential surface 103 of the end cover 212a is constructed as the first connecting surface M1 and is connected to a portion of the inner circumferential surface 107 of the shell 211 to form a connecting portion 211c, the molten barrier material on the third side surface 101c can flow to the first connecting surface M1 and the second connecting surface M2 through the guide slope 108; in the scheme where the end surface 105 of the shell 211 is constructed as the second connecting surface M2 and a portion of the first side surface 101 is the first connecting surface M1 that cooperates with the second connecting surface M2, in the embodiment where the end cover 212a is connected to the end surface 105 of the shell 211, at least a portion of the first side surface 101 protrudes toward the interior of the battery cell 20 to form a protrusion 212a1, and the guide slope 108 can be the circumferential surface of the protrusion 212a1.

[0228] In some embodiments of the present application, Fig.10 As shown, the guide slope 108 can be arranged around the end cover 212a to form an annular area. Therefore, when the battery cell 20 is heated, the barrier material initially located on the third side 101c can be more evenly moved between the first connecting surface M1 and the second connecting surface M2, thereby forming the barrier 212b of the present application and improving the sealing performance between the end cover 212a and the housing 20.

[0229] The guide slope 108 can surround the coating area 101b, and can further reduce the material of the end cover 212a, thereby reducing the manufacturing cost of the end cover 212a.

[0230] According to some embodiments of the present application, Fig.11 and Fig.13 As shown, the edge region of the third side surface 101c is provided with a first groove 104a, one end of the first groove 104a extends to the first connecting surface M1, and at least a portion of the groove bottom surface of the first groove 104a is configured as a guiding inclined surface 108. In other words, the edge region of the third side surface 101c is not formed as an inclined inclined surface as a whole, but a portion of the edge region of the third side surface 101c is recessed toward the second side surface 102, thereby forming the first groove 104a.

[0231] The first groove 104a can introduce the molten barrier material on the third side 101c into between the first connecting surface M1 and the second connecting surface M2. The first groove 104a can store a certain amount of molten barrier material. Therefore, the area coated with the barrier material on the inner circumferential surface 107 of the shell 211 opposite to the first groove 104a is greater than the area coated with the barrier material on other areas of the inner circumferential surface 107, thereby at least improving the sealing effect between the end cover 212a and the shell 211 to a certain extent.

[0232] It can be understood that the area on the inner circumferential surface of the shell 211 that is not directly opposite to the first groove 104a has a gap connected to the first groove 104a between it and the end cover 212a, and the molten material flowing out of the first groove 104a coats the area on the inner circumferential surface 107 of the shell 211 that is not directly opposite to the first groove 104a through the gap.

[0233] Since the edge area of ​​the third side surface 101c is not entirely an inclined surface, the flow of the molten material is more concentrated, and the molten material is more likely to pass through the first groove 104a to reach between the first connecting surface M1 and the second connecting surface M2, thereby reducing the probability that the molten material is not easy to flow between the first connecting surface M1 and the second connecting surface M2 due to the overall large edge area of ​​the third side surface 101c.

[0234] Providing the first groove 104a in the edge region of the first side surface 101 can also significantly reduce the material used for the end cover 212a and reduce the manufacturing cost of the end cover 212a.

[0235] According to some embodiments of the present application, Figure 10-11As shown, there are multiple first grooves 104a, and the multiple first grooves 104a are arranged at intervals along the circumference of the end cover 212a. Therefore, after the barrier material is melted, the molten material on the coating area 101c can flow evenly between the first connecting surface M1 and the second connecting surface M2, thereby improving the sealing uniformity between the end cover 212a and the inner circumferential surface 107 of the shell 211.

[0236] Of course, by providing a plurality of first grooves 104 a on the edge region of the first side surface 101 , the material used for the end cover 212 a can be further reduced, thereby reducing the manufacturing cost of the end cover 212 a.

[0237] In some embodiments of the present application, Fig.11 and Fig.13 As shown, the third side surface 101c is provided with a second groove 104b, and one end of the first groove 104a away from the first connection surface M1 is connected to the second groove 104b. The initial barrier material can be stored in the second groove 104b, and the thickness of the barrier material in the second groove 104b is greater than the thickness of the barrier material in other areas of the third side surface 101c. Therefore, after the battery cell 20 is heated, the amount of the barrier material in the second groove 104b after melting can support it to flow between the first connection surface M1 and the second connection surface M2, ensuring good sealing performance between the end cover 212a and the shell 211.

[0238] Of course, by providing the second groove 104b, the material used for the end cover 212a can be further reduced, thereby reducing the manufacturing cost of the end cover 212a.

[0239] In some embodiments of the present application, Fig.11 and Fig.13 As shown, the bottom surface of the first groove 104a connects the bottom surface of the second groove 104b and the first connection surface M1. Therefore, after the battery cell 20 is heated and melted, the portion of the barrier material initially located in the second groove 104b can easily flow through the bottom surface of the first groove 104a and reach between the first connection surface M1 and the second connection surface M2.

[0240] The molten barrier material may flow from the first side surface 101 to the inner circumferential surface 107 of the housing 211 , and the molten barrier material may even flow between the first connecting surface M1 and the second connecting surface M2 .

[0241] According to some embodiments of the present application, Figure 10-11As shown, the second groove 104b is an annular groove extending in the circumferential direction of the third side surface. Therefore, the initial barrier material in the second groove 104b can have a sufficient amount of material after melting, and can then flow in the circumferential direction to between the first connecting surface M1 and the second connecting surface M2, so that the sealing performance between the end cover 212a and the housing 211 is further improved.

[0242] In some embodiments of the present application, Fig.13 As shown, the angle between the guide slope 108 and the first connecting surface M1 is α, which satisfies: 110°≤α≤170°. For example, α can be 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145°, 150°, 155°, 160°, 165° or 170°.

[0243] The above-mentioned values ​​of α are only some specific examples of the embodiments of the present application. As long as the angle between the guiding inclined surface 108 and the first connecting surface M1 satisfies the above-mentioned range, it is within the protection scope of the present application.

[0244] Since the angle between the guide slope 108 and the first connecting surface M1 satisfies the above range, on the one hand, the initial blocking material on the third side 101c can flow more easily between the first connecting surface M1 and the second connecting surface M2 after melting; on the other hand, the inclination angle of the guide slope 108 is not too large, resulting in poor structural strength of the outer periphery of the end cover 212a.

[0245] Of course, the included angle between the guiding inclined surface 108 and the first connecting surface M1 satisfies the above range, which can also reduce the weight of the end cover 212a and the manufacturing cost of the end cover 212a.

[0246] The battery 100 according to the embodiment of the present application is briefly described below.

[0247] The battery 100 according to the embodiment of the present application includes the above-mentioned battery cell 20. Since the battery 100 according to the embodiment of the present application is provided with the above-mentioned battery cell 20, the end cap 212a of the battery 100 has a stronger corrosion resistance, effectively reducing the risk of the end cap 212a being corroded by the electrolyte, and also reducing the risk of electrolyte leakage in the battery 100.

[0248] According to some embodiments of the present application, the end cap 212a is located below the housing 211 along the direction of gravity. Therefore, when the battery cell 20 is inverted and baked at high temperature, the molten barrier material can flow to the side of the connecting portion 211c facing the inside of the battery cell 20 under the action of gravity, thereby reducing the probability of the electrolyte contacting the connecting portion 211c.

[0249] The following is a brief description of the electrical equipment in the embodiments of the present application.

[0250] The electric device according to the embodiment of the present application includes the battery cell 20 of the above embodiment or the battery 100 of the above embodiment. Since the electric device according to the embodiment of the present application is provided with the above battery cell 20 or battery, the power supply stability of the electric device is improved.

[0251] like Fig.28 As shown, the manufacturing method of the battery cell 20 according to the embodiment of the present application is described in detail below.

[0252] It should be noted that the initial barrier material in the embodiments of the present application refers to Figure 4-Figure 5 The blocking member 212b is shown before being melted.

[0253] S1: Provide an end cap assembly 212, which includes an end cap 212a and an initial stopper 212b. The stopper 212b is located on one side of the end cap 212a in the thickness direction. Figure 4-Figure 5 As shown, the end cap 212a has a first side surface 101 and a second side surface 102, and the first side surface 101 and the second side surface 102 are arranged opposite to each other along the thickness direction of the end cap 212a. The end cap 212a also has a first peripheral surface 103, and the first peripheral surface 103 can connect the first side surface 101 and the second side surface 102 together. The initial blocking member 212b can be arranged on the first side surface 101.

[0254] It should be noted that the initial blocking member 212 b in the end cap assembly 212 may be melted after the battery cell 20 is heated.

[0255] S2: Provide a housing 211 having a first opening.

[0256] S3: providing an electrode assembly 22 , and installing the electrode assembly 22 into the shell 211 .

[0257] Of course, the electrode assembly 22 can enter the interior of the housing 211 through the first opening. Before or after this step, the electrolyte can also be injected into the interior of the housing 211.

[0258] S4: Cover the end cover assembly 212 on the first opening 106 so that the initial blocking member 212 b faces the interior of the housing 211 ;

[0259] S5: Connect the end cover 212a and the housing 211 to form an assembly.

[0260] Alternatively, the end cover 212a and the housing 211 may be fixed together by welding. The weld between the end cover 212a and the housing 211 (ie, the connecting portion 211c) may be located at a portion between the end cover 212a and the housing 211 close to the outside.

[0261] S6: heating the assembly to melt the initial blocking member 212 b and connect the end cap 212 a and the housing 211 .

[0262] Thus, the blocking member 212b can at least partially enter between the end cap 212a and the housing 211, blocking the electrolyte to a certain extent, reducing the probability of the electrolyte contacting the connecting portion 211c. The end cap 212a and the housing 211 can not only be sealed once through the fixed connection area of ​​the two, but also be sealed twice between the end cap 212a and the housing 211 through the blocking member 212b.

[0263] S7: Cooling the assembly to solidify the blocking member 212b.

[0264] After the temperature is lowered, the molten barrier material will harden and solidify to form a barrier 212b, so that the barrier 212b flowing between the end cover 212a and the shell 211 will seal the gap between the end cover 212a and the inner circumference of the shell 211, and prevent the electrolyte from contacting the connecting portion 211c.

[0265] S8: injecting electrolyte into the interior of the housing 211 .

[0266] According to the manufacturing method of the battery cell 20 of the embodiment of the present application, the electrode assembly 22 can be loaded into the shell 211, and the assembly can be heated to allow the molten blocking member 212b to flow between the end cover 212a and the shell 211, thereby blocking the electrolyte to at least a certain extent and reducing the contact probability between the electrolyte and the connecting portion 211c, thereby reducing the occurrence of leakage of the battery cell 20.

[0267] In addition, the cured blocking member 212b can completely cover the third side surface 101c. Even if the end cover assembly 212 is disposed below the battery cell 20, the third side surface 101c will not contact the electrolyte, thereby reducing the risk of the end cover 212a being corroded by the electrolyte.

[0268] After the end cover assembly 212 and the shell 211 are assembled together to form an assembly, the assembly is heated, and the initial barrier material melts at this time. The molten barrier material can diffuse between the first connecting surface M1 and the second connecting surface M2, so that not only can the end cover 212a and the shell 211 be sealed once through the fixed connection area, but the solidified barrier material can also extend to between the first connecting surface M1 and the second connecting surface M2, thereby reducing the probability of the electrolyte contacting the connecting portion 211c and reducing the possibility of the connecting portion 211c being corroded, and performing a secondary seal between the end cover 212a and the shell 211, thereby further improving the sealing performance of the battery cell 20, further reducing the risk of electrolyte leakage in the battery cell 20, and improving the reliability of the battery cell.

[0269] In some embodiments of the present application, when the assembly is heated, the end cap assembly 212 faces downward. As a result, the molten barrier material on the third side 101c can flow toward between the end cap 212a and the shell 211 under the action of gravity, so that the initial barrier material can diffuse between the end cap 212a and the shell 211 after cooling, thereby blocking the electrolyte to at least a certain extent, reducing the contact probability between the electrolyte and the connecting portion 211c, and thus reducing the occurrence of leakage of the battery cell 20.

[0270] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: A housing having a first opening; An end cover, covering the first opening, wherein the end cover and the housing are sealed and connected to form a connecting portion; An electrolyte is disposed in the housing; An electrode assembly is disposed in the housing; A blocking member connects the end cover and the shell and is located on a side of the connecting portion facing the interior of the battery cell.

2. The battery cell according to claim 1, characterized in that: The end cover has a first connecting surface, the shell has a second connecting surface, the first connecting surface and the second connecting surface are arranged opposite to each other and connected to form the connecting portion, and at least a part of the blocking member is arranged between the first connecting surface and the second connecting surface.

3. The battery cell according to claim 2, characterized in that: The portion of the blocking member disposed between the first connecting surface and the second connecting surface is an annular structure extending along the circumference of the end cover.

4. The battery cell according to claim 2, characterized in that: The end cover has a first side surface facing the interior of the battery cell and a second side surface away from the interior of the battery cell, and a first outer peripheral surface connecting the first side surface and the second side surface, and the first connecting surface is the first outer peripheral surface; the shell has an inner peripheral surface facing the interior of the battery cell, and a portion of the inner peripheral surface forms the second connecting surface.

5. The battery cell according to claim 2, characterized in that: The shell has a second outer peripheral surface facing away from the interior of the battery cell and an inner peripheral surface facing the interior of the battery cell, and an end surface connecting the inner peripheral surface and the second outer peripheral surface, the second connecting surface is the end surface, and the end cover has a first side surface facing the interior of the battery cell, and a portion of the first side surface forms the first connecting surface.

6. The battery cell according to claim 5, characterized in that: A protrusion is formed on the first side surface, and the first connecting surface is arranged around the protrusion.

7. The battery cell according to claim 6, characterized in that: A portion of the blocking member is disposed between the protruding portion and the inner circumferential surface of the housing.

8. The battery cell according to any one of claims 2 to 7, characterized in that: The shell has an end face, the end cover has a third side face facing the inside of the battery cell and staggered with the end face along the thickness direction of the end cover, and the first connecting surface is arranged around the third side face; The blocking member includes a first portion and a second portion connected to each other, the first portion is disposed between the first connecting surface and the second connecting surface, and the second portion covers at least a portion of the third side surface.

9. The battery cell according to claim 8, characterized in that: The blocking member covers the entire third side surface.

10. The battery cell according to claim 8, characterized in that: The second part includes a main body and a thickened portion, wherein the thickened portion is arranged around the outer periphery of the main body; Along the thickness direction of the end cover, the maximum thickness of the thickened portion is greater than the maximum thickness of the main body portion.

11. The battery cell according to claim 10, characterized in that: The thickened portion has a first side connected to the main body portion and a second side connected to the first portion, and the thickness of the thickened portion gradually increases from the first side to the second side.

12. The battery cell according to claim 10, characterized in that: The maximum thickness of the thickened portion is t, and satisfies: 0mm<t≤3mm.

13. The battery cell according to claim 8, characterized in that: At least a portion of the edge region of the third side surface is configured as a guide bevel.

14. The battery cell according to claim 13, characterized in that: The included angle between the guiding inclined surface and the first connecting surface is an obtuse angle.

15. The battery cell according to claim 13, characterized in that: The guiding slope is arranged around the end cover to form an annular area.

16. The battery cell according to claim 13, characterized in that: A first groove is provided in an edge region of the third side surface, one end of the first groove extends to the first connecting surface, and at least a portion of a groove bottom wall of the first groove is configured as the guiding inclined surface.

17. The battery cell according to claim 16, characterized in that: There are a plurality of the first grooves, and the plurality of the first grooves are arranged at intervals along the circumference of the end cover.

18. The battery cell according to claim 17, characterized in that: The third side surface is further provided with a second groove, which is arranged at an end of the first groove away from the first connecting surface and is communicated with the first groove.

19. The battery cell according to claim 18, characterized in that: The second groove is an annular groove extending along the circumference of the third side surface.

20. The battery cell according to claim 1, characterized in that The melting point of the barrier is greater than or equal to 85° C. and less than or equal to 120° C.

21. The battery cell according to claim 1, characterized in that: The blocking member includes one of paraffin wax, rosin, PE wax, polyolefin, stearic acid and white oil.

22. A battery, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 21.

23. The battery according to claim 22, characterized in that The end cover is located below the shell along the direction of gravity.

24. An electrical equipment, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 21 or a battery as claimed in claim 22 or 23, wherein the battery is used for providing electrical energy.

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