Battery cells, batteries and electrical devices

Abstract

The battery cell (100) includes an outer casing (110) having an internal cavity and a first wall (111), an electrode assembly (120) disposed in the internal cavity, a separator structure (170) at least a portion of which is located between the first wall (111) and the electrode assembly (120) and having a first through-hole (150), and an insulating sheet (160) including a first portion (161) that shields the first through-hole (150). In the battery cell (100), the first portion (161) of the insulating sheet (160) shields the first through-hole (150), thereby reducing to a certain extent the probability that powder on one side of the electrode assembly (120) will migrate to one side of the first wall (111) through the first through-hole (150), thereby improving the reliability of the battery cell (100).

Description

[Technical Field]

[0001] This application claims priority to an application filed on March 31, 2023, bearing application number 202310341097.1 and entitled "Battery Cell, Battery and Electrical Device," the contents of which are incorporated herein by reference.

[0002] This application relates to the field of battery technology, and more particularly to battery cells, batteries, and electrical devices. [Background technology]

[0003] During the battery production process, a separator structure is installed between the electrode assembly and the outer casing, and the separator structure has through-holes, and powder on one side of the electrode assembly is likely to migrate through the through-holes between the separator structure and the outer casing, resulting in short circuit or corrosion of the battery cell. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a battery cell, a battery and an electric device to solve the technical problem of short circuit or corrosion of battery cells in the prior art.

[0005] In order to achieve the above object, the technical solutions adopted in this application are as follows. In a first aspect, an outer casing having an interior cavity and a first wall; an electrode assembly disposed in the internal cavity; a separator structure provided between the first wall and the electrode assembly, the separator structure having a first communication hole; and an insulating sheet including a first portion that shields the first communication hole.

[0006] In this installation method, the electrode assembly is positioned within the outer casing, the separator structure is positioned between the first wall of the outer casing and the electrode assembly, and the insulating sheet shields the first communicating hole. Therefore, by installing the insulating sheet, the probability of powder on one side of the electrode assembly migrating to one side of the first wall through the first communicating hole can be reduced to a certain extent, thereby improving the reliability of the battery cell.

[0007] In one possible design, a plurality of first through holes are provided in the separator structure, and the insulating sheet covers all of the first through holes.

[0008] In this installation method, the insulating sheet shields all of the first communication holes, thereby reducing the probability that powder on one side of the electrode assembly will migrate to one side of the first wall through the first communication holes if there are multiple first communication holes.

[0009] In one possible design, the number of insulating sheets is equal to the number of first communication holes, and the insulating sheets are installed in one-to-one correspondence with the first communication holes, with each insulating sheet shielding the corresponding first communication hole; alternatively, the number of insulating sheets is one, with one insulating sheet shielding all of the first communication holes.

[0010] In this installation method, when one insulating sheet is installed corresponding to one first communication hole, the dimensions of each insulating sheet are relatively small, thereby reducing the space occupied by the insulating sheets. When one insulating sheet is used to cover all the first communication holes, the assembly efficiency of the insulating sheets is relatively high.

[0011] In one possible design, the first portion is adhered to the opening of the first through hole.

[0012] In this installation method, the first part is fixed by adhesive, so that the first part has a better shielding effect on the first communication hole.

[0013] In one possible design, the first portion is located on one side of the separator structure towards the first wall.

[0014] In this installation method, during the assembly process, the electrode assembly is first connected to the separator structure, and then the first part is shielded by the separator structure and installed on one side facing the first wall of the separator structure, which makes it easy to connect the first part to the separator structure after connecting the separator structure to the electrode assembly.

[0015] In one possible design, the separator structure includes a baffle positioned between the electrode assembly and the first wall, and an insulating film at least a portion of which is positioned between the electrode assembly and the first wall, the first communication hole including a first hole section and a second hole section that are oppositely arranged and communicate with each other, the first hole section being located in the insulating film and the second hole section being located in the baffle, and the first section shielding an opening on one side away from the second hole section of the first hole section or an opening on one side away from the first hole section of the second hole section.

[0016] In this installation method, first perforations are provided in the insulating film and second perforations are provided in the baffle, so that the insulating film and the baffle can be positioned by the first perforations and the second perforations. The first portion shields one side of the first perforations away from the second perforations, or the first portion shields one side of the second perforations away from the first perforations, so that the first portion can be connected after the insulating film and the baffle are connected.

[0017] In one possible design, the insulating film is folded and wrapped around the electrode assembly, forming first and second folded edges that overlap each other on the sides of the electrode assembly, and the insulating sheet includes a second portion that secures the first and second folded edges, and the first portion is connected to the second portion.

[0018] In this installation method, the insulating sheet not only shields the first through-hole but also fixes the first folded edge and the second folded edge, and since the insulating sheet includes the first and second connected parts, the contact area between the insulating sheet and the separator structure is increased, improving the connection stability between the insulating sheet and the separator structure.

[0019] In one possible design, the second portion is spaced apart from at least one edge of the separator structure in the first direction, the first direction being parallel to the width of the first wall.

[0020] In this installation method, the second part is installed at a distance from at least one edge of the separator structure, i.e., the dimensions of the second part in the first direction are smaller than the dimensions of the separator structure, making it easier to attach the second part to the insulating film and reducing the space occupied by the second part.

[0021] In one possible design, the distance between the second portion and opposite edges of the separator structure in the first direction is equal.

[0022] In this installation method, the second portion is adhered to the central region of the insulating film, making it easy to fix the first folded edge and the second folded edge.

[0023] In one possible design, in the first direction, the width of the outer casing is W1 and the width of the second part is W2, with 0.1≦W2 / W1≦0.9.

[0024] In this installation method, the width of the second portion can be set according to the width of the outer casing, and the width of the second portion is sufficient to secure the first folded edge and the second folded edge.

[0025] In one possible design, 0.25≦W2 / W1≦0.75.

[0026] In this installation method, the width of the second part is relatively small based on the fixing of the first folded edge and the second folded edge.

[0027] In one possible design, the second portion measures between 10 mm and 80 mm along the height of the electrode assembly.

[0028] In this installation method, the height of the second portion is sufficient to secure the first folded edge and the second folded edge.

[0029] In one possible design, the second portion measures between 15 mm and 50 mm along the height of the electrode assembly.

[0030] In this installation method, the height of the second part is relatively small based on the fixing of the first folding edge and the second folding edge.

[0031] In one possible design, only two holes are provided in the baffle, and both of the two holes in the baffle are first hole sections; only two holes are provided in the insulating film, and both of the two holes in the insulating film are second hole sections, with the two first hole sections facing one-to-one with the two second hole sections.

[0032] In this installation method, the baffle has only the first hole section, with no other holes, and the insulating film has only the second hole section, with no other holes, and the first hole section communicates with the second hole section in a one-to-one correspondence to form a first communication hole, which is shielded by the first part of the insulating sheet, so that the baffle and the insulating sheet have a better blocking effect on the powder on one side of the electrode assembly.

[0033] In one possible design, the separator structure further includes a support block, the baffle being positioned between the insulating film and the first wall, and the support block being positioned on one side of the baffle facing the first wall.

[0034] The first communication hole penetrates the baffle and the insulating film, and the support block is installed in an area of ​​the baffle where the first communication hole is not installed, or Second communication holes are provided in the support blocks, and the second communication hole of at least one support block is provided to face the first communication hole, and the first portion shields the second communication hole.

[0035] In this installation method, a support block is installed in the separator structure, and the support block can improve the structural strength of the separator structure. When the support block is installed in an area where no first communicating hole is installed, the first part only needs to shield the first communicating hole. When the support block is installed in an area opposite the first communicating hole, the support block has a second communicating hole opposite the first communicating hole. Therefore, the shielding of the second communicating hole in the first part can achieve the shielding of the first communicating hole in the first part, thereby reducing the probability of powder on one side of the electrode assembly migrating to one side of the first wall through the first communicating hole.

[0036] In a second aspect, a battery is provided, which includes a battery cell provided by the above technical solution.

[0037] Since the battery includes the battery cells, it has at least all the beneficial effects of the battery cells, and the description thereof is omitted here.

[0038] In a third aspect, there is provided an electric device, comprising a battery for providing electric energy provided by the above technical solution.

[0039] Since the electrical device includes the battery, it has at least all the beneficial effects of the battery, the description of which is omitted here. [Brief explanation of the drawings]

[0040] In order to more clearly explain the technical solutions in the embodiments of the present application, the following briefly introduces the drawings used in the description of the embodiments or prior art. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can derive other drawings based on these drawings without any creative work. [Figure 1] 1 is a structural schematic diagram of an electrical device provided by an embodiment of the present application; [Figure 2] 1 is a structural schematic diagram of a battery provided in accordance with an embodiment of the present application; [Figure 3] FIG. 2 is an exploded view of a battery cell provided in accordance with a first embodiment of the present application. [Figure 4] 4 is a schematic diagram of the relative positions of the insulating sheet and separator structure in the battery cell of FIG. 3. FIG. [Figure 5] FIG. 5 is a schematic diagram showing the structure of the insulating sheet of FIG. [Figure 6] FIG. 4 is a schematic development view of an insulating sheet in the battery cell of FIG. 3. [Figure 7] FIG. 2 is a structural schematic diagram of a battery cell provided in accordance with a first embodiment of the present application at one viewing angle. [Figure 8] FIG. 2 is a structural schematic diagram of a battery cell provided according to a first embodiment of the present application at another viewing angle; [Figure 9] FIG. 2 is a schematic diagram of the relative positions of an insulating sheet and a separator structure in a battery cell provided according to a second embodiment of the present application. [Figure 10] FIG. 10 is a structural schematic diagram of the insulating sheet of FIG. 9. [Figure 11] FIG. 2 is a structural schematic diagram of a battery cell provided according to a second embodiment of the present application at one viewing angle. [Figure 12] FIG. 10 is a schematic diagram of the relative positions of the insulating sheet and the separator structure in a battery cell provided by a third embodiment of the present application. [Figure 13] FIG. 13 is a structural schematic diagram of the insulating sheet of FIG. [Figure 14] FIG. 10 is a structural schematic diagram of a battery cell provided according to a third embodiment of the present application at one viewing angle. [Figure 15]FIG. 10 is a schematic diagram of the relative positions of the insulating sheet and the separator structure in a battery cell provided according to a fourth embodiment of the present application. [Figure 16] FIG. 16 is a structural schematic diagram of the insulating sheet of FIG. [Figure 17] FIG. 10 is a structural schematic diagram of a battery cell provided according to a fourth embodiment of the present application at one viewing angle. [Figure 18] FIG. 10 is a schematic diagram of the relative positions of the insulating sheet and the separator structure in a battery cell provided according to a fifth embodiment of the present application. [Figure 19] FIG. 10 is a structural schematic diagram of a battery cell provided in accordance with a fifth embodiment of the present application at one viewing angle. [Figure 20] FIG. 10 is a schematic diagram of the relative positions of the insulating sheet and the separator structure in a battery cell provided by a sixth embodiment of the present application. [Figure 21] FIG. 10 is a structural schematic diagram of a battery cell provided in accordance with a sixth embodiment of the present application at one viewing angle. [Figure 22] FIG. 10 is a schematic diagram of the relative positions of the insulating sheet and the separator structure in a battery cell provided according to a seventh embodiment of the present application. [Figure 23] FIG. 10 is a structural schematic diagram of a battery cell provided in accordance with a seventh embodiment of the present application at one viewing angle. [Figure 24] FIG. 13 is a schematic diagram of the relative positions of the insulating sheet and the separator structure in the battery cell provided by the eighth embodiment of the present application. [Figure 25] FIG. 13 is a structural schematic diagram of a battery cell provided in accordance with an eighth embodiment of the present application at one viewing angle. [Figure 26] FIG. 13 is a schematic diagram of the relative positions of the insulating sheet and the separator structure in a battery cell provided according to a ninth embodiment of the present application. [Figure 27]10 is a structural schematic diagram of a battery cell provided in accordance with a ninth embodiment of the present application at one viewing angle. 1, electrical device, 10, battery, 20, control mechanism, 30, driving mechanism, 100, battery cell, 200, case, 101, top cover patch, 102, top cover, 103, adapter sheet, 104, protective film, 110, outer casing, 111, first wall, 120, electrode assembly, 122, tab, 130, insulating film, 131, first film layer, 132, second film layer, 132a, first folded edge, 132b, second folded edge, 140, baffle, 1411, third communication hole, 150, first communication hole, 151, first hole section, 152, second hole section, 160, insulating sheet, 161, first portion, 162, second portion, 170, separator structure, 180, support block; 181, second communicating hole. DETAILED DESCRIPTION OF THE INVENTION

[0041] In order to make the technical problems, technical solutions and beneficial effects that the present application aims to solve more clear, the present application will be described in more detail below in conjunction with the drawings and examples. It should be understood that the specific examples described herein are only for interpreting the present application, and are not intended to limit the present application.

[0042] In describing the embodiments of the present application, the term "plurality" means two or more (including two).

[0043] In describing the embodiments of the present application, unless otherwise clearly specified or limited, technical terms such as "attached," "coupled," "connected," and "fixed" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or integration, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, internal communication between two elements, or an interactive relationship between two elements. Those skilled in the art will be able to understand the specific meanings of the above terms in the embodiments of the present application according to specific circumstances.

[0044] It should be understood that the orientations or positional relationships indicated by terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," etc. are based on the orientations or positional relationships shown in the drawings and are intended merely to facilitate and simplify the description of this application, and are not intended to indicate or imply that the battery cells or elements referred to have a particular orientation or must be configured and operated in a particular orientation, and therefore should not be understood as limiting this application.

[0045] Furthermore, the terms "first" and "second" are merely descriptive and should not be understood as indicating or implying the relative importance or quantity of the technical features indicated. Thus, a feature qualified as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of the embodiments of this application, "plurality" means two or more, unless otherwise clearly and specifically limited.

[0046] In the embodiments of the present application, the battery cell may be a secondary battery, which refers to a battery cell that can be continuously used after discharging by activating the active material through charging. The battery cell may be a lithium ion battery, a sodium ion battery, a sodium potassium ion battery, a lithium metal battery, a sodium metal battery, a potassium sulfur battery, a magnesium ion battery, a nickel metal hydride battery, a nickel zirconium battery, a lead acid battery, etc., but the embodiments of the present application are not limited thereto.

[0047] As an example, the battery cells may be cylindrical battery cells, prismatic battery cells, soft-pack battery cells, or battery cells of other shapes, and prismatic battery cells include rectangular battery cells, blade-shaped battery cells, and polygonal prismatic batteries such as hexagonal prisms, and are not particularly limited in this application.

[0048] A battery cell generally includes an electrode assembly, which includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (e.g., lithium ions) are repeatedly inserted and removed between the positive electrode and the negative electrode. The separator, located between the positive electrode and the negative electrode, prevents short circuits between the positive electrode and the negative electrode while allowing the active ions to pass through.

[0049] In some embodiments, the positive electrode may be a positive electrode strip that 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.

[0050] As an example, the positive electrode current collector has two surfaces that face each other in the thickness direction of the positive electrode current collector, and the positive electrode active material is disposed on one or both of the two facing surfaces of the positive electrode current collector.

[0051] For example, the positive electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector is formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, or silver alloy) on a polymeric material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0052] As an example, the positive electrode active material may include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as the positive electrode active material of a battery may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of the lithium-containing phosphate may include, but are not limited to, at least one of lithium iron phosphate (e.g., LiFePO4 (also abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (e.g., LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon.

[0053] In some embodiments, the positive electrode may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. When a metal foam is used as the positive electrode, a positive electrode active material may or may not be provided on the surface of the metal foam. For example, a lithium source material, such as potassium metal or sodium metal, may be filled and / or deposited in the metal foam, and the lithium source material may be lithium metal and / or a lithium-rich material.

[0054] In some embodiments, the negative electrode may be a negative electrode strip, which may include a negative electrode current collector.

[0055] For example, the negative electrode current collector may be a metal foil, a metal foam, or a composite current collector. For example, the metal foil may be aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium. The composite current collector may include a polymeric material base layer and a metal layer. The metal foam may be nickel foam, copper foam, aluminum foam, an alloy foam, or carbon foam. The composite current collector is constructed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, or silver alloy) on a polymeric material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene). For example, the negative electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector is constructed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, iron, titanium alloy, silver, or silver alloy) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0056] As an example, the negative electrode piece can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0057] As an example, the negative electrode current collector has two surfaces that face each other in the thickness direction of the negative electrode current collector, and the negative electrode active material is disposed on either one or both of the two facing surfaces of the negative electrode current collector.

[0058] For example, the negative electrode active material may be any negative electrode active material known in the art for use in battery cells, and may include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate.

[0059] In some embodiments, the negative electrode may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. When a metal foam is used as the negative electrode piece, the negative electrode active material may or may not be applied to the surface of the metal foam.

[0060] As an example, a lithium source material, potassium metal or sodium metal may be loaded or / and deposited in the negative electrode current collector, where the lithium source material is lithium metal and / or a lithium-rich material.

[0061] In some embodiments, the material of the positive current collector may be aluminum and the material of the negative current collector may be copper.

[0062] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0063] In some embodiments, the separator is a separator film. The present application does not particularly limit the type of separator film, but any separator film having a known porous structure and good chemical and mechanical stability can be selected.

[0064] For example, the main material of the separator film may be at least one selected from glass fiber, nonwoven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0065] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive and negative electrodes and simultaneously serves to transport ions and separate the positive and negative electrodes.

[0066] In some embodiments, the battery cell further includes an electrolyte that serves to conduct ions between the positive electrode and the negative electrode. The present application does not specifically limit the type of electrolyte, and the electrolyte may be selected as needed. The electrolyte may be in a liquid, gel, or solid state.

[0067] In some embodiments, the electrode assembly is a wound structure, and the positive and negative electrode pieces are wound around the wound structure.

[0068] In some embodiments, the electrode assembly is a laminate structure.

[0069] For example, a plurality of positive electrode pieces and a plurality of negative electrode pieces can be provided, and the plurality of positive electrode pieces and the plurality of negative electrode pieces are provided in an alternating stack.

[0070] As an example, multiple positive electrode pieces can be installed, and the negative electrode pieces can be folded to form multiple folded tiers that are installed in a stack, with one positive electrode piece sandwiched between adjacent folded tiers.

[0071] In one example, both the positive and negative electrode pieces are folded to form a plurality of folds arranged in a stacked manner.

[0072] For example, a plurality of separators may be provided, each disposed between any adjacent positive and negative electrode pieces.

[0073] As an example, the separator can be placed continuously and folded or wound between any adjacent positive and negative electrode pieces.

[0074] In some embodiments, the shape of the electrode assembly may be cylindrical, flat, polygonal, or the like.

[0075] In some embodiments, the electrode assembly is provided with tabs through which current can be conducted from the electrode assembly, the tabs including a positive electrode tab and a negative electrode tab.

[0076] In some embodiments, the battery cell may include an outer casing, which is used to enclose components such as the electrode assembly and electrolyte.

[0077] In one example, the outer casing includes a casing having an opening and an end cap assembly, the end cap assembly covering the opening of the casing and forming an internal cavity together with the casing, and the outer casing can be a steel shell, an aluminum shell, a plastic shell, a composite metal shell, an aluminum plastic film, or the like.

[0078] The end cap assembly includes a top cover and a top cover patch attached to one side of the top cover away from the casing. Electrode terminals, including a positive terminal and a negative terminal, are attached to the top cover, with the positive tab connected to the positive terminal and the negative tab connected to the negative terminal. An adapter sheet is connected between the tabs and the electrode terminals. The adapter sheet is used to prevent damage to the battery or other components from burning in the event of a short circuit or overcharge / discharge of the electrode assembly, thereby ensuring the safety of the battery.

[0079] A separator structure is installed between the electrode assembly and the casing, and a protective film is attached to the outside of the outer casing.

[0080] In some embodiments, the exterior casing is provided with a pressure relief mechanism for releasing the internal pressure of the battery cell. For example, when the internal pressure or temperature of the battery cell reaches a predetermined threshold, the mechanism is activated to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism is activated or a fragile structure within the pressure relief mechanism is broken, thereby forming an opening or passage for releasing the internal pressure or temperature. The design of the threshold varies depending on design requirements. The threshold may depend on one or more materials of the positive electrode piece, the negative electrode piece, the electrolyte, and the separator within the battery cell. For example, the pressure relief mechanism may be integrally molded with the exterior casing. For example, the pressure relief mechanism may be separately installed and connected to the exterior casing. As used herein, "activation" refers to the pressure relief mechanism being activated or activated to a certain state, thereby releasing the internal pressure and temperature of the battery cell. The operation of the pressure release mechanism can include, but is not limited to, a member within the pressure release mechanism moving to form an exhaust passage, or at least a portion of the pressure release mechanism rupturing, crushing, tearing, or opening. When the pressure release mechanism is activated, high-temperature, high-pressure materials inside the battery cell are discharged to the outside through the operating portion as exhaust. In this way, pressure and temperature release of the battery cell can be achieved at a controllable pressure or temperature, thereby preventing the occurrence of potentially more serious accidents. Exhaust materials from the battery cell referred to in the embodiments of this application include, but are not limited to, electrolyte, dissolved or separated positive and negative electrode pieces, separator fragments, high-temperature, high-pressure gases generated by reactions, flames, etc.

[0081] The battery referred to in the embodiments of the present application may include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or series-parallel via a bus member.

[0082] In some embodiments, the battery may be a battery module, and if there are multiple battery cells, the multiple battery cells are arranged and fixed together to form a battery module.

[0083] In some embodiments, the battery may be a battery pack including a case and battery cells, with the battery cells or modules housed within the case.

[0084] In some embodiments, the case may be used as part of a chassis structure of a vehicle, for example, a portion of the case may be at least a portion of a floor of the vehicle, or a portion of the case may be at least a portion of a cross member and a side member of the vehicle.

[0085] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, or the like.

[0086] In recent years, new energy vehicles have made great strides in development, and in the field of electric vehicles, power batteries play an irreplaceable and important role as the power source for electric vehicles. A battery consists of a case and a number of battery cells housed in the case. As a core component of new energy vehicles, batteries have relatively high requirements in terms of both safety and cycle life.

[0087] In related designs, the separator structure has through holes to allow airflow on both sides of the separator structure or to facilitate positioning and installation of the separator structure. The through holes form passages on both sides of the separator structure, allowing powder (e.g., anode powder) on one side of the electrode assembly to move to the other side of the separator structure through the through holes, and contact between the powder and the outer casing located on the other side of the separator structure can easily cause short circuits or corrosion in the battery cells. For example, the separator structure includes an insulating film and a bottom support plate, and through holes are formed in both the insulating film and the bottom support plate, and the through holes in the insulating film are positioned opposite the through holes in the bottom support plate, thereby facilitating the positioning of the insulating film and the bottom support plate and facilitating connection between the insulating film and the bottom support plate. However, after the connection between the insulating film and the bottom support plate is completed, the through holes in the insulating film communicate with the through holes in the bottom support plate to form a passage, which allows the powder to move from one side of the electrode assembly through the passage to the other side of the separator structure and come into contact with the outer casing, which makes the battery cell more likely to short-circuit and affects the usage stability of the battery cell.

[0088] Based on the above considerations, a battery cell is designed to solve the above problems. The battery cell includes an outer casing, an electrode assembly, a separator structure positioned between the electrode assembly and a first wall of the outer casing and having a first through hole, and an insulating sheet that shields the first through hole. Because the first through hole is shielded, powder on one side of the electrode assembly can move to the other side of the separator structure through the through hole.

[0089] The battery cell provided by this embodiment can be used in batteries applicable to electric devices, including, but not limited to, mobile phones, portable devices, laptops, electric scooters, electric vehicles, boats, spacecraft, electric toys, and power tools. For example, spacecraft include airplanes, rockets, space shuttles, and spaceships. Electric toys include stationary or mobile electric toys such as game consoles, electric car toys, electric boat toys, and electric plane toys. Electric tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0090] 1 and 2 , for convenience of explanation, the vehicle in this example is an electric device 1. However, the vehicle may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range-extended vehicle. A drive mechanism 30, a control mechanism 20, and a battery 10 may be installed inside the vehicle. The drive mechanism 30 may be a motor, and the control mechanism 20 is used to control the battery 10 to supply power to the drive mechanism 30. For example, the battery 10 may be installed at the bottom, front, or rear of the vehicle. The battery 10 may also be used to power other devices in the vehicle. For example, the battery 10 may be used as an operating power source for the vehicle's circuit systems, such as for starting, navigation, and operating power needs during driving. In another example, the battery 10 may not only serve as an operating power source for the vehicle, but also as a driving power source for the vehicle, fully or partially replacing fuel or natural gas to provide driving power to the vehicle. The vehicle in this example employs the battery 10 described above, and improving the reliability of the battery 10 can help improve the reliability of the electric device 1 .

[0091] 3 to 8, this embodiment provides a battery cell 100 including an outer casing 110 having an internal cavity and a first wall 111, an electrode assembly 120 provided in the internal cavity, a separator structure 170 provided between the first wall 111 and the electrode assembly 120, with a first communication hole 150 provided in a portion located between the first wall 111 and the electrode assembly 120, and an insulating sheet 160 including a first portion 161 that shields the first communication hole 150.

[0092] The exterior casing 110 forms the outer casing structure of the battery cell 100. The exterior casing 110 is hollow at least partially to form an internal cavity. The exterior casing 110 has a first wall 111 which is one wall surface of the exterior casing 110. The first wall 111 may be at least one of the bottom wall, top wall, or side wall of the exterior casing 110. The exterior casing 110 may be an aluminum casing or other materials.

[0093] In some examples, the outer casing 110 includes a casing and an end cap assembly, with a protective film 104 attached to the outside of the casing. The casing has an opening, and the end cap assembly covers the opening and defines an internal cavity together with the casing. The casing may be a steel shell, an aluminum shell, a plastic shell, a composite metal shell, or an aluminum-plastic film. The first wall 111 may be located on the casing or the end cap assembly. The electrode assembly 120 is attached to the internal cavity, and may have a wound structure or a stacked structure. The electrode assembly 120 may be inserted into the internal cavity through the opening in the casing. The electrode assembly 120 includes a tab 122 including a positive electrode tab and a negative electrode tab. The end cap assembly includes a top cover 102 and a top cover patch 101 attached to one side of the top cover 102 facing away from the casing. Terminals are attached to the top cover 102. The electrode terminals include a positive terminal and a negative terminal, with the positive electrode tab connected to the positive terminal and the negative electrode tab connected to the negative terminal. The tabs 122 and the electrode terminals are connected by an adapter sheet 103. The adapter sheet 103 is used to prevent damage to the battery 10 or other components from being burned in the event of a short circuit or overcharge / discharge of the electrode assembly 120, thereby ensuring the safety of battery use.

[0094] The electrode assembly 120 is attached to the internal cavity, and may be a wound structure or a stacked structure. The electrode assembly 120 may be inserted into the internal cavity of the outer casing 110 through an opening in the outer casing 110.

[0095] The separator structure 170 is attached to the internal cavity and is located at least partially between the first wall 111 and the electrode assembly 120, and the separator structure 170 is used to provide insulation between the first wall 111 and the electrode assembly 120, so that the electrode assembly 120 cannot contact the first wall 111. The separator structure 170 may be made of an insulating material.

[0096] The separator structure 170 provides insulation between the electrode assembly 120 and the first wall 111 of the exterior casing 110, thereby reducing the possibility of a short circuit in the electrode assembly 120 and helping to improve the reliability of the battery cell 100. Due to the insulation provided by the separator structure 170, even if a certain amount of deformation occurs in the exterior casing 110, the separator structure 170 can isolate the first wall 111 from the electrode assembly 120, further reducing problems such as a short circuit caused by contact between the electrode assembly 120 and the first wall 111.

[0097] The separator structure 170 may be fabricated using insulating materials.

[0098] In this example, at least a portion of the separator structure 170 is located between the first wall 111 and the electrode assembly 120, and a first communication hole 150 is provided in the separator structure 170, and the first communication hole 150 is provided in a region of the separator structure 170 that is located between the first wall 111 and the electrode assembly 120. The first communication hole 150 is provided to penetrate the separator structure 170. The first communicating hole 150 may be used to position the separator structure 170 during the assembly process. For example, the first communicating hole 150 may pass through a positioning structure and be used to position the installation position of the separator structure 170 using the positioning structure, thereby facilitating installation of the separator structure 170. Alternatively, if the separator structure 170 includes multiple components, the first communicating hole 150 may pass through at least two of the components, and the first communicating hole 150 may pass through the positioning structure to align the at least two components installed on the separator structure 170 through which the first communicating hole 150 passes, thereby facilitating assembly of the separator structure 170 itself.

[0099] In the drawings of this embodiment, the length direction of the battery cell 100 is indicated as the X direction, the width direction is indicated as the Y direction, and the height direction is indicated as the Z direction. The X direction, Y direction, and Z direction are perpendicular to each other, and the X direction, Y direction, and Z direction do not point in a single direction or to a single position; any direction parallel to the X direction is called the X direction, any direction parallel to the Y direction is called the Y direction, and any direction parallel to the Z direction is called the Z direction.

[0100] Illustratively, the X and Y directions are both parallel to the first wall 111, and the first communication holes 150 penetrate the separator structure 170 along the Z direction.

[0101] The first portion 161 of the insulating sheet 160 is used to shield the first communication hole 150 and block communication between both sides of the first communication hole 150, thereby reducing or even preventing to a certain extent the migration of powder from one side of the electrode assembly 120 to one side of the first wall 111 through the first communication hole 150. For example, the first portion 161 may be disposed on one side of the separator structure 170 adjacent to the first wall 111 and shield the first communication hole 150; the first portion 161 may be disposed on one side of the separator structure 170 adjacent to the electrode assembly 120 and shield the first communication hole 150; or the first portion 161 may also extend at least partially into the first communication hole 150 and block the first communication hole 150, thereby shielding the first communication hole 150. The first communication hole 150 is used to position and attach the separator structure 170, and after the separator structure 170 is positioned, it blocks the first portion 161 in the first communication hole 150, thereby blocking communication through the first communication hole 150. The first portion 161 blocking the first communication hole 150 means that the first portion 161 overlaps with the projection of the first communication hole 150, or that the projection of the first communication hole 150 is completely located within the projection of the first portion 161 in a plane parallel to the first wall 111.

[0102] In this installation method, the electrode assembly 120 is positioned within the outer casing 110, the separator structure 170 is positioned between the first wall 111 of the outer casing 110 and the electrode assembly 120, and the insulating sheet 160 shields the first communication hole 150. Therefore, the installation of the insulating sheet 160 can reduce to a certain extent the probability of powder on one side of the electrode assembly 120 migrating to one side of the first wall 111 through the first communication hole 150, thereby improving the reliability of the battery cell 100.

[0103] The insulating sheet 160 may have a film layer structure, which is relatively thin and occupies a relatively small space. For example, the thickness of the insulating sheet 160 may be 0.01 mm to 0.5 mm, such as 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.1 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.42 mm, 0.48 mm, or 0.5 mm. The thickness of the insulating sheet 160 is the vertical distance between one side of the insulating sheet 160 facing the separator structure 170 and the opposite side. The thickness of the first portion 161 between the first wall 111 and the separator structure 170 is the dimension of the first portion 161 in the Z direction. Within this size range, the insulating sheet 160 has sufficient structural strength to block the passage of powder or liquid, thereby shielding the first communication hole 150, and within this size range, the thickness of the insulating sheet 160 is relatively small, the occupied space is relatively small, and the mass is relatively light.

[0104] In one possible design, a plurality of first through holes 150 are provided in the separator structure 170, and the insulating sheet 160 covers all of the first through holes 150.

[0105] To achieve more stable positioning, the separator structure 170 is provided with a plurality of first communication holes 150, each of which is located in an area between the first wall 111 of the separator structure 170 and the electrode assembly 120 and is spaced apart from the plurality of first communication holes 150. The plurality of first communication holes 150 are used to pass through a plurality of positioning structures, which then position the separator structure 170 through the plurality of positioning structures, resulting in better positioning effect and greater stability. After positioning is complete, the insulating sheet 160 covers all of the first communication holes 150. After the battery cell 100 is fully assembled, all of the first communication holes 150 are covered by the insulating sheet 160, thereby blocking any of the first communication holes 150 and preventing powder from migrating to the other side of the separator structure 170 through a particular first communication hole or holes 150. In this installation method, the insulating sheet 160 shields all of the first communication holes 150, so when there are multiple first communication holes 150, the probability of powder on one side of the electrode assembly 120 migrating to one side of the first wall 111 through the first communication holes 150 is reduced.

[0106] In one alternative embodiment, the number of insulating sheets 160 is equal to the number of first communication holes 150, and the insulating sheets 160 are installed in one-to-one correspondence with the first communication holes 150, with each insulating sheet 160 covering the corresponding first communication hole 150; alternatively, the number of insulating sheets 160 is one, with each insulating sheet 160 covering all of the first communication holes 150.

[0107] That is, when there are a plurality of first communication holes 150, there may be one or more insulating sheets 160, and as shown in Figures 9 to 14, when there is one insulating sheet 160, the insulating sheet 160 can cover all of the first communication holes 150. When there are a plurality of insulating sheets 160, as shown in Figures 7 and 8 and Figures 15 to 17, one insulating sheet 160 may be used to cover one or more first communication holes 150.

[0108] For example, the number of first communication holes 150 may be four, and the number of insulating sheets 160 may be one, two, three, or four. When there is one insulating sheet 160, the insulating sheet 160 covers four first communication holes 150. When there are two insulating sheets 160, one insulating sheet 160 covers one first communication hole 150, and another insulating sheet 160 covers three first communication holes 150. Alternatively, of the two insulating sheets 160, each insulating sheet 160 may cover two first communication holes 150. When there are three insulating sheets 160, one insulating sheet 160 covers two first communication holes 150, and the other two insulating sheets 160 cover one first communication hole 150 each. When the number of insulating sheets 160 is four, each insulating sheet 160 covers one corresponding first communication hole 150 .

[0109] 7 and 8 , in one alternative embodiment, the number of insulating sheets 160 is equal to the number of first communication holes 150, and the insulating sheets 160 are installed in one-to-one correspondence with the first communication holes 150, with each insulating sheet 160 covering the corresponding first communication hole 150. For example, if there are two first communication holes 150 and two insulating sheets 160, the first portion 161 of one insulating sheet 160 covers one first communication hole 150, and the first portion 161 of another insulating sheet 160 covers the other first communication hole 150. In this installation method, because each insulating sheet 160 only needs to cover one first communication hole 150, the dimensions of the insulating sheets 160 are relatively small, reducing the space occupied by the insulating sheets 160.

[0110] The insulating sheet 160 may be made of an insulating adhesive tape (for example, an insulating blue tape), an insulating film 130 (for example, an insulating blue film), or other materials that can provide insulating effect.

[0111] In one possible design, the first portion 161 may be connected to the separator structure 170 using a hot melt method to block the first through hole 150 .

[0112] Alternatively, in another possible design, the first portion 161 is adhered to the opening of the first through hole 150 .

[0113] Because the first communication hole 150 penetrates the separator structure 170, the first communication hole 150 has two openings, one opening adjacent to the first wall 111 and the other opening adjacent to the electrode assembly 120. The first portion 161 of the insulating sheet 160 may be adhered to the opening of the first communication hole 150 adjacent to the first wall 111, or may be adhered to the opening of the first communication hole 150 adjacent to the electrode assembly 120.

[0114] In this installation method, the first part 161 is fixed to the separator structure 170 by adhesive and covers the first communication hole 150, which makes it easier to fix the first part 161 by adhesive and also makes the connection between the first part 161 and the separator structure 170 tighter, resulting in a better shielding effect.

[0115] An adhesive layer may be provided on the first portion 161 itself, for example, the insulating sheet 160 is an insulating adhesive tape with one non-adhesive side and the other adhesive side, one adhesive side of the insulating sheet 160 is adhered to the separator structure 170, and the first portion 161 of the insulating sheet 160 covers the first communication hole 150. Alternatively, the first portion 161 may not be provided with an adhesive layer and may be adhered to the separator structure 170 with an adhesive.

[0116] The insulating sheet 160 may be located on one side of the separator structure 170 that is away from the first wall 111 and close to the electrode assembly 120, or may be located on one side of the separator structure 170 that is toward the first wall 111 and away from the electrode assembly 120. In some examples, the first portion 161 is located on one side of the separator structure 170 that is toward the first wall 111. In this installation method, during the assembly process, the electrode assembly 120 and the separator structure 170 are first connected, and then the first portion 161 is shielded by the separator structure 170 and installed on one side of the separator structure 170 that is toward the first wall 111, which makes it easier to connect the first portion 161 to the separator structure 170 after the separator structure 170 and the electrode assembly 120 are connected. Since the first part 161 is installed on one side of the separator structure 170 facing the first wall 111, there is a larger operating space and easier operation when fixing and connecting the first part 161 and the separator structure 170.

[0117] In one possible design, as shown in Figures 4, 9, 12 and 15, the separator structure 170 includes a baffle 140 positioned between the electrode assembly 120 and the first wall 111, and an insulating film 130, at least a portion of which is positioned between the electrode assembly 120 and the first wall 111, wherein the first communication hole 150 includes a first hole section 151 and a second hole section 152 that are oppositely arranged and communicate with each other, the first hole section 151 being located in the insulating film 130 and the second hole section 152 being located in the baffle 140, and the first portion 161 shields an opening on one side of the first hole section 151 that is away from the second hole section 152 or an opening on one side of the second hole section 152 that is away from the first hole section 151.

[0118] The insulating film 130 covers the outside of the electrode assembly 120, and at least a portion of the insulating film 130 is located between the electrode assembly 120 and the first wall 111, and the baffle 140 is located between the electrode assembly 120 and the first wall 111. The baffle 140 is installed between the insulating film 130 and the electrode assembly 120, and the baffle 140 may be installed between the insulating film 130 and the first wall 111.

[0119] The first communication hole 150 includes a first hole section 151 and a second hole section 152. The first hole section 151 is disposed opposite the second hole section 152 and communicates with each other. The first hole section 151 is disposed on the insulating film 130 and penetrates the insulating film 130. The second hole section 152 is disposed on the baffle 140 and penetrates the baffle 140. The cross-sectional shape of the first hole section 151 may be the same as or different from the cross-sectional shape of the second hole section 152. The first hole section 151 and the second hole section 152 may each have a circular hole, an elliptical hole, a track hole, a polygonal hole, etc. The cross-sectional shapes of the first hole section 151 and the second hole section 152 are both shapes in a cross section parallel to the first wall 111.

[0120] In this installation method, the insulating film 130 is provided with a first perforation 151 and the baffle 140 is provided with a second perforation 152. Therefore, the insulating film 130 and the baffle 140 can be positioned by the first perforation 151 and the second perforation 152. In the process of positioning the insulating film 130 and the baffle 140, the positioning structure first passes through the first perforation 151 and then extends to the second perforation 152, or the positioning structure first passes through the second perforation 152. The positioning structure then extends to the first hole section 151, and the engagement between the positioning structure and the first hole section 151 defines the relative position between the positioning structure and the insulating film 130, and the engagement between the positioning structure and the second hole section 152 defines the relative position between the positioning structure and the baffle 140. The same positioning structure drills the first hole section 151 and the second hole section 152 in sequence, so that the insulating film 130 and the baffle 140 are positioned relative to each other by the positioning structure. The first part 161 shields one side of the first hole step 151 away from the second hole step 152, or the first part 161 shields one side of the second hole step 152 away from the first hole step 151, and the first hole step 151 is connected to the second hole step 152, so that by simply shielding either the first hole step 151 or the second hole step 152, the communication of the first communicating hole 150 can be blocked by the first part 161. Since the first communication hole 150 is used to position and attach the insulating film 130 and the baffle 140, there is no need to use the first communication hole 150 after the insulating film 130 and the baffle 140 are connected. Therefore, after the insulating film 130 and the baffle 140 are connected, the first part 161 is connected, and the first part 161 is shielded by the first hole step 151 or the second hole step 152, thereby shielding the first communication hole 150.

[0121] 3, 4, and 6, the insulating film 130 includes a first film layer 131 positioned between the electrode assembly 120 and the first wall 111 and a second film layer 132 wrapped around at least a portion of the circumferential side of the electrode assembly 120, where the first film layer 131 and the second film layer 132 may be independent structures connected together or may be an integral structure. When the first film layer 131 and the second film layer 132 are independent structures, the second film layer 132 may be an integral structure or a separate structure. When the second film layer 132 is a separate structure, the second film layer 132 includes multiple sub-film layers, where different sub-film layers are wrapped around different outer sides of the electrode assembly 120, and the edges of adjacent sub-film layers are connected.

[0122] Illustratively, the insulating film 130 is an entire film layer, i.e., the first film layer 131 and the second film layer 132 are an integral structure, and are wrapped around multiple sides of the electrode assembly 120 after folding, with the portion located between the electrode assembly 120 and the first wall 111 being the first film layer 131 and the portion wrapped around the outside of the electrode assembly 120 being the second film layer 132.

[0123] As shown in FIGS. 12-17, in one possible design, the insulating sheet 160 includes only a first portion 161. As shown in FIG.

[0124] Alternatively, in another possible design, the insulating film 130 is folded and wrapped around the electrode assembly 120, forming a first folded edge 132a and a second folded edge 132b that overlap or are connected to the sides of the electrode assembly 120, and the insulating sheet 160 includes a second portion 162 that secures the first folded edge 132a and the second folded edge 132b, and the first portion 161 is connected to the second portion 162.

[0125] For example, as shown in FIG. 6 , the dashed lines in FIG. 6 are folding marks, the insulating film 130 is an entire film layer, and the second film layer 132 is divided into two parts, called the first sub-film layer and the second sub-film layer, respectively. The first sub-film layer and the second sub-film layer are located on opposite sides of the first film layer 131, respectively. In the X direction, first folding edges 132a are respectively provided on both sides of the first sub-film layer, and second folding edges 132b are respectively provided on both sides of the second sub-film layer. The first folding edges 132a and the second folding edges 132b are respectively provided in one-to-one correspondence. After folding, one of the first folding edges 132a has a partial overlapping area with one of the second folding edges 132b, and the second part 162 fixes the first folding edge 132a and the second folding edge 132b. Another first folded edge 132a has a partial overlapping area with another second folded edge 132b, and the second portion 162 secures the first folded edge 132a and the second folded edge 132b together.

[0126] In this installation method, the insulating sheet 160 can not only shield the first communication hole 150 but also fix the first folded edge 132a and the second folded edge 132b. Because the insulating sheet 160 includes the connected first portion 161 and the second portion 162, the contact area between the insulating sheet 160 and the separator structure 170 is increased, improving the connection stability between the insulating sheet 160 and the separator structure 170.

[0127] When the number of first folded edges 132a and second folded edges 132b is plural, the number of insulating sheets 160 may be one or more. When the number of insulating sheets 160 is one, the number of first portions 161 is one, the number of second portions 162 is the same as the number of first folded edges 132a, and each second portion 162 is connected to the same first portion 161. Illustratively, the number of first folded edges 132a and second folded edges 132b is two. As shown in FIGS. 9 and 10 , the number of insulating sheets 160 is one, the number of first portions 161 is one, and the number of second portions 162 is two, and the two second portions 162 are used to fix the corresponding pairs of first folded edges 132a and second folded edges 132b, respectively.

[0128] When the number of insulating sheets 160 is plural and is less than the number of first folded edges 132a, one insulating sheet 160 includes one first portion 161 and multiple second portions 162, the number of second portions 162 is less than the number of first folded edges 132a, and the total number of second portions 162 of the multiple insulating sheets 160 is equal to the number of first folded edges 132a. The number of second folded edges 132b of different insulating sheets 160 may be the same or different. For example, if the number of first folding edges 132a is four, the number of second folding edges 132b is four, and the number of insulating sheets 160 is two, one of the insulating sheets 160 may include one first portion 161 and three second portions 162, another insulating sheet 160 may include one first portion 161 and one second portion 162, or both of the two insulating sheets 160 may include one first portion 161 and two second portions 162.

[0129] When the number of insulating sheets 160 is the same as the number of first folded edges 132a, each insulating sheet 160 includes one first portion 161 and one second portion 162. For example, as shown in Figures 4 and 5, the number of first folded edges 132a is two, the number of insulating sheets 160 is two, and each insulating sheet 160 includes one first portion 161 and one second portion 162, one of the second portions 162 fixes one of the first folded edges 132a and one of the second folded edges 132b, and another second portion 162 fixes another of the first folded edges 132a and another of the second folded edges 132b.

[0130] The second portion 162 can be attached to the insulating film 130 to fix the first folded edge 132a and the second folded edge 132b, i.e., the second portion 162 is connected to the first folded edge 132a and the second folded edge 132b by adhesive. The first folded edge 132a has a partial overlapping area with the second folded edge 132b, and the second portion 162 is partially adhered to the first folded edge 132a and partially adhered to the second folded edge 132b, thereby fixing the first folded edge 132a and the second folded edge 132b. Because the first folded edge 132a has a partial overlapping area with the second folded edge 132b, the covering effect of the first folded edge 132a and the second folded edge 132b on the electrode assembly 120 can be improved.

[0131] In one possible design, the second portion 162 is spaced apart from at least one of two spaced-apart edges of the separator structure 170 in the first direction, the first direction being parallel to the width direction of the first wall 111. The first direction is the Y direction. Since the second portion 162 is spaced apart from at least one edge of the separator structure 170, in the first direction, one side of the separator structure 170 has two opposing edges and the second portion 162 is spaced apart from one of the edges, or there is a gap between the second portion 162 and both of the two edges of the separator structure 170.

[0132] In this installation method, the second portion 162 is installed at a distance from at least one edge of the separator structure 170, i.e., in the first direction, the dimensions of the second portion 162 are smaller than the dimensions of the separator structure 170, making it easier to attach the second portion 162 flat to the insulating film 130 and reducing the space occupied by the second portion 162.

[0133] In one possible design, the distance in the first direction is equal to the distance between the second portion 162 and the opposite edges of the separator structure 170. That is, on one side of the separator structure 170, the second portion 162 is installed in the center, and when the fold between the first folded edge 132a and the second folded edge 132b is located in a non-edge region of the electrode assembly 120, the second portion 162 can achieve a relatively good fixing effect to both the first folded edge 132a and the second folded edge 132b. In this installation method, the second portion 162 is adhered to the central region of the insulating film 130, making it easy to fix the first folded edge 132a and the second folded edge 132b. At the same time, since the second part 162 is placed in the central region on one side of the separator structure 170, both edges of the second part 162 are bonded to the corresponding side of the separator structure 170, which makes it easier to improve the flatness of the bonding of the second part 162.

[0134] In some embodiments, the widths of the first portion 161 and the second portion 162 are equal, i.e., the dimension of the first portion 161 in the first direction is equal to the dimension of the second portion 162. Illustratively, the insulating sheet 160 has a rectangular strip-like structure, one side of which facing the separator structure 170 is adhered to the first folded edge 132a and the second folded edge 132b, and then, after being folded, is adhered to the side facing the first wall 111 of the separator structure 170, thereby blocking the first through-hole 150. The portion adhered to the first folded edge 132a and the second folded edge 132b is the second portion 162, and the portion adhered to the separator structure 170 facing the first wall 111 is the first portion 161.

[0135] 7 and 8 , in the first direction, the width of the outer casing 110 is W1, the width of the second portion 162 is W2, and 0.1≦W2 / W1≦0.9. The width of the outer casing 110 is the dimension of the outer casing 110 in the first direction, and the width of the second portion 162 is the dimension of the second portion 162 in the first direction. That is, the width of the second portion 162 is at least 0.1 times the width of the outer casing 110, and the width of the second portion 162 is at most 0.9 times the width of the outer casing 110. As can be seen from the above, the setting range of the width of the second portion 162 is related to the width of the outer casing 110. In this installation method, the width of the second portion 162 can be set according to the width of the outer casing 110. The width of the second portion 162 is 0.1 times or more the width of the outer casing 110, so that the width of the second portion 162 is sufficient to secure the first folded edge 132a and the second folded edge 132b. The width of the second portion 162 is 0.9 times or less the width of the outer casing 110, so that the second portion 162 can be installed to completely overlap the side of the separator structure 170, achieving a relatively high degree of flatness and occupying a relatively small space. For example, the width of the second portion 162 may be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or the like times the width of the outer casing 110. For example, if the width of the outer casing 110 is 100 mm, the width of the second portion 162 ranges from 10 mm to 90 mm, for example, 10 mm, 15 mm, 20 mm, 25 mm, 35 mm, 40 mm, 48 mm, 50 mm, 60 mm, 70 mm, 78 mm, 80 mm, 90 mm, etc.

[0136] In some embodiments, 0.25≦W2 / W1≦0.75. That is, the width of the second portion 162 is at least 0.25 times the width of the outer casing 110, thereby increasing the contact area with the first folded edge 132a and the second folded edge 132b and thereby improving the fastening effect with the first folded edge 132a and the second folded edge 132b. The width of the second portion 162 is at most 0.75 times the width of the outer casing 110, thereby satisfying the fastening of the first folded edge 132a and the second folded edge 132b and occupying a relatively small space. For example, the width of the second portion 162 may be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or the like times the width of the outer casing 110. For example, if the width of the outer casing 110 is 100 mm, the width of the second portion 162 ranges from 25 mm to 75 mm, such as 25 mm, 28 mm, 30 mm, 37 mm, 42 mm, 47 mm, 52 mm, 55 mm, 65 mm, 72 mm, or 75 mm.

[0137] 8, the dimension of the second portion 162 along the height direction of the electrode assembly 120 is 10 mm to 80 mm. That is, the dimension of the second portion 162 in the Z direction is 10 mm to 80 mm, and for example, the dimension of the second portion 162 may be 10 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, or 80 mm. In this installation method, the height of the second portion 162 can be sufficient to secure the first folded edge 132a and the second folded edge 132b.

[0138] In some embodiments, the dimension of the second portion 162 along the height direction of the electrode assembly 120 is 15 mm to 50 mm. That is, the dimension of the second portion 162 in the Z direction is 15 mm to 50 mm. For example, the dimension of the second portion 162 may be 15 mm, 17 mm, 22 mm, 27 mm, 32 mm, 38 mm, 42 mm, 48 mm, or 50 mm. In this installation method, the contact area between the second portion 162 and the first folded edge 132 a and the second folded edge 132 b is relatively larger, the fixing effect to the first folded edge 132 a and the second folded edge 132 b is relatively better, and at the same time, the second portion 162 occupies a relatively small space on the side of the separator structure 170 due to the satisfactory fixing of the first folded edge 132 a and the second folded edge 132 b.

[0139] In some embodiments, the separator structure 170 includes a baffle 140 positioned between the electrode assembly 120 and the first wall 111, and an insulating film 130, at least a portion of which is positioned between the electrode assembly 120 and the first wall 111, and the first communication hole 150 includes a first hole section 151 and a second hole section 152 that are oppositely arranged and communicate with each other, and the first hole section 151 is arranged in the insulating film 130, and the second hole section 152 is arranged in the baffle 140. For example, when the number of first communication holes 150 is two, the number of first hole stages 151 is two, and the number of second hole stages 152 is two, the two first hole stages are installed in a one-to-one opposite relationship with the two second hole stages and are connected in a one-to-one opposite relationship, and the first part 161 is either shielded by the opening on one side of the first hole stage 151 away from the second hole stage 152 or the opening on one side of the second hole stage 152 away from the first hole stage 151.

[0140] In one specific embodiment, only two holes are provided in the baffle 140, and the two holes in the baffle 140 are both first hole sections 151, and only two holes are provided in the insulating film 130, and the two holes in the insulating film 130 are both second hole sections 152. That is, the baffle 140 has only two holes, and the two holes are both first hole sections 151, and there are no other holes penetrating the baffle 140 except for the first hole section 151. The insulating film 130 has only two holes, and the two holes are both second hole sections 152, and there are no other holes penetrating the insulating film 130 except for the second hole section 152. The first and second perforations 151 and 152 are used to position the baffle 140 and the insulating film 130, and the two first and two second perforations 151 and 152 can provide relatively good positioning accuracy. After the positioning of the baffle 140 and the insulating film 130 is completed, at least one of the first and second perforations 151 and 152 is blocked by the first section 161, i.e., the first communication hole 150 formed by the first and second perforations 151 and 152 is blocked, and the first section 161 blocks all of the holes in the baffle 140 and the insulating film 130, thereby providing the baffle and the insulating sheet with a better blocking effect against powder on one side of the electrode assembly.

[0141] As shown in Figures 18 and 19, in one possible design, the separator structure 170 further includes a support block 180, the baffle 140 is installed between the insulating film 130 and the first wall 111, and the support block 180 is installed on one side of the baffle 140 facing the first wall 111. In one installation method, the support block 180 is installed in an area of ​​the baffle 140 where the first communication hole 150 is not installed. In another installation method, a second communication hole 181 is installed in the support block 180, and the second communication hole 181 of at least one support block 180 is installed opposite the first communication hole 150, and the first portion 161 blocks the second communication hole 181.

[0142] The number of support blocks 180 may be one or more. When there is one support block 180, the support block 180 may be installed in an area where the first communication hole 150 of the baffle 140 is installed, or may be installed in an area where the first communication hole 150 of the baffle 140 is not installed. When the support block 180 is installed in an area where the first communication hole 150 of the baffle 140 is installed, a second communication hole 181 that communicates with the first communication hole 150 is installed in the support block 180. When the support block 180 is installed in an area where the first communication hole 150 of the baffle 140 is not installed, a second communication hole 181 may be installed in the support block 180, or the second communication hole 181 may not be installed. When there are a plurality of support blocks 180, all of the support blocks 180 may be installed in an area where the first communication holes 150 of the baffle 140 are installed, or all of the support blocks 180 may be installed in an area where the first communication holes 150 of the baffle 140 are not installed, or some of the support blocks 180 may be installed in an area where the first communication holes 150 of the baffle 140 are installed, and other some of the support blocks 180 may be installed in an area where the first communication holes 150 of the baffle 140 are not installed. When all of the support blocks 180 are installed in an area where the first communication holes 150 are installed, all of the support blocks 180 are installed with second communication holes 181, and the second communication holes 181 communicate with the first communication holes 150 in a one-to-one correspondence, and the first portion 161 blocks all of the second communication holes 181. When only some of the support blocks 180 are installed in the area where the first communication holes 150 of the baffle 140 are installed, second communication holes 181 are installed in the support blocks 180 that block the first communication holes 150 and communicate with the first communication holes 150 through the second communication holes 181, and the other support blocks 180 that do not have the first communication holes 150 may or may not have the second communication holes 181. When all of the support blocks 180 are installed in the area where the first communication holes 150 of the baffle 140 are not installed, the support blocks 180 may or may not have the second communication holes 181.

[0143] In one possible installation method, the baffle 140 has two first communication holes 150 spaced apart, and four support blocks 180 are installed, two of the four support blocks 180 being installed in two first communication holes 150 each, and two of the support blocks 180 being installed in areas where no first communication holes 150 are installed, and all four support blocks 180 have second communication holes 181, and the second communication hole 181 in the support block 180 installed opposite a first communication hole 150 is installed opposite and communicates with the corresponding first communication hole 150. Because all four support blocks 180 have second communication holes 181 installed, the four support blocks 180 can have the same structure, which makes production and manufacturing easier.

[0144] The support block 180 is installed in the separator structure 170, and the support block 180 can improve the structural strength of the separator structure 170. When the support block 180 is installed in an area where the first communication hole 150 is not installed, the first portion 161 only needs to shield the first communication hole 150. When the support block 180 is installed in an area facing the first communication hole 150, the support block 180 has a second communication hole 181 that faces the first communication hole 150. Therefore, the first portion 161 can shield the first communication hole 150 by shielding the second communication hole 181, thereby reducing the likelihood of powder on one side of the electrode assembly 120 migrating to one side of the first wall 111 through the first communication hole 150.

[0145] In some examples, the support block 180 and the baffle 140 may be connected by hot melt, and the baffle 140 and the insulating film 130 may be connected by hot melt.

[0146] 18 and 19 , in some examples, two first communication holes 150 are provided in the baffle 140, the center line of the baffle 140 along the width direction is P1, and both first communication holes 150 are provided in an area close to one side edge of the baffle 140 in the width direction, i.e., both first communication holes 150 are located on the same side of P1. There are four support blocks 180, and two support blocks 180 are provided with second communication holes 181, and these two support blocks 180 are both provided at positions facing the first communication holes 150, and the second communication holes 181 in the support blocks 180 communicate with the first communication holes 150. Two other support blocks 180 are not provided with second communication holes 181, and the other two support blocks 180 are provided in an area where no first communication holes 150 are provided. There are two insulating sheets 160, and a first portion 161 of one of the insulating sheets 160 is adhered to the surfaces of two support blocks 180 on one side of the baffle 140 along the longitudinal direction, facing away from the baffle 140, and the first portion 161 covers the second communication hole 181 in one of the support blocks 180. A first portion 161 of another insulating sheet 160 is adhered to the surfaces of two support blocks 180 on the other side of the baffle 140 along the longitudinal direction, facing away from the baffle 140, and the first portion 161 covers the second communication hole 181 in one of the support blocks 180.

[0147] 20 and 21 , in some examples, two first communication holes 150 are provided in the baffle 140, the center line of the baffle 140 along the width direction is P1, and both first communication holes 150 are provided in an area close to one side edge of the baffle 140 in the width direction, i.e., both first communication holes 150 are located on the same side of P1. There are four support blocks 180, and two support blocks 180 are provided with second communication holes 181, and these two support blocks 180 are both provided at positions facing the first communication holes 150, and the second communication holes 181 in the support blocks 180 communicate with the first communication holes 150. Two other support blocks 180 are not provided with second communication holes 181, and the other two support blocks 180 are provided in an area where no first communication holes 150 are provided. There are two insulating sheets 160, and a first portion 161 of one of the insulating sheets 160 is attached to a surface of the support block 180, on which the second communication hole 181 is provided, located on one side along the length of the baffle 140 and facing away from the baffle 140, so that the first portion 161 covers the second communication hole 181. The first portion 161 of the other insulating sheet 160 is attached to a surface of the support block 180, on which the second communication hole 181 is provided, facing away from the baffle 140, so that the first portion 161 covers the second communication hole 181.

[0148] 22 and 23 , in some examples, two first communication holes 150 are provided in the baffle 140, the center line of the baffle 140 along the width direction is P1, and both first communication holes 150 are provided in an area close to one side edge of the baffle 140 in the width direction, i.e., both first communication holes 150 are located on the same side of P1. There are four support blocks 180, and two support blocks 180 are provided with second communication holes 181, and these two support blocks 180 are both provided at positions facing the first communication holes 150, and the second communication holes 181 in the support blocks 180 communicate with the first communication holes 150. Two other support blocks 180 are not provided with second communication holes 181, and the other two support blocks 180 are provided in an area where no first communication holes 150 are provided. The number of insulating sheets 160 is one, and the first portions 161 of the insulating sheet 160 are respectively adhered to two support blocks 180 on both sides in the X direction, in which second communication holes 181 are installed, and the first portions 161 of the insulating sheet 160 shield the two second communication holes 181.

[0149] As shown in Figures 24 and 25, in some examples, two first communication holes 150 are installed in the baffle 140, the center line along the width direction of the baffle 140 is P1, and the center points of the two first communication holes 150 are both located at P1, i.e., the two first communication holes 150 are installed in the center of the width direction of the baffle 140, the number of support blocks 180 is four, none of the four support blocks 180 has a second communication hole 181 installed, and none of the four support blocks 180 is installed in an area where no first communication hole 150 is installed, i.e., none of the first communication holes 150 is blocked by any one of the support blocks 180. The number of insulating sheets 160 is one, and the first portion 161 of the insulating sheet 160 is in close contact with the baffle 140, and the first portion 161 of the insulating sheet 160 shields the two second communication holes 181 along both sides in the X direction.

[0150] 26 and 27 , in some examples, two first communication holes 150 are provided in the baffle 140, the center line of the baffle 140 along the width direction is P1, and the center points of the two first communication holes 150 are both located at P1, i.e., the two first communication holes 150 are provided in the center of the baffle 140 in the width direction, the number of support blocks 180 is four, none of the four support blocks 180 has a second communication hole 181, and none of the four support blocks 180 is provided in an area where a first communication hole 150 is provided, i.e., none of the first communication holes 150 is blocked by any one of the support blocks 180. The number of insulating sheets 160 is two, and the two insulating sheets 160 are attached to the shielding structure with a gap between them, and the first portions 161 of the two insulating sheets 160 respectively block the two first communication holes 150.

[0151] 18, 24, and 26, in one installation method, a third communication hole 1411 is provided in the baffle 140. The third communication hole 1411 penetrates the baffle 140 in the Z direction and can communicate with two opposing surfaces of the baffle 140 in the Z direction, allowing the airflow on both sides of the baffle 140 in the Z direction to flow with each other, further increasing the airflow flow paths within the battery cells and improving the airflow flow performance within the battery cells. At the same time, providing the third communication hole 1411 in the baffle 140 can also reduce the weight of the baffle 140, thereby making the battery cells lighter.

[0152] In one installation method, the number of third communication holes 1411 in the baffle 140 is multiple, and the multiple third communication holes 1411 are all installed in the central region of the baffle 140. The multiple third communication holes 1411 may be distributed in an array on the baffle 140, and in the X direction, the first communication holes 150 are installed on both sides of the array region formed by the multiple third communication holes 1411.

[0153] The cross-sectional dimensions of each third communication hole 1411 are all smaller than the cross-sectional dimension of the first communication hole 150. When the first communication hole 150 includes a first hole section 151 and a second hole section 152, the cross-sectional dimensions of the first hole section 151 and the second hole section 152 may or may not be equal. When the cross-sectional dimensions of the first hole section 151 and the second hole section 152 are unequal, the cross-sectional dimension of the third communication hole 1411 is smaller than the smaller cross-sectional dimension of either the first hole section 151 or the second hole section 152. That is, the dimension of the third communication hole 1411 is relatively small compared to the first communication hole 150.

[0154] This embodiment further provides an example of a battery 10 based on the above battery cell 100. The battery 10 includes the battery cell 100 provided by any one of the above embodiments.

[0155] The battery 10 may be a battery 10 module, and when there are a plurality of battery cells 100, the plurality of battery cells 100 are rearranged and fixed to form a battery 10 module.

[0156] The battery 10 may be a battery 10-pack, which includes a case 200 and battery cells 100, and the battery cells 100 or battery modules are housed in the case 200. The case 200 is used to provide a housing space for the battery cells 100 or battery modules, and the case 200 may be independent of other structures of the electric device 1, or may be part of other structures of the electric device 1. For example, if the electric device 1 is a vehicle, the case 200 may be part of the chassis of the vehicle; for example, a portion of the case 200 may be at least a portion of the floor of the vehicle, or a portion of the case 200 may be at least a portion of a cross member and a side member of the vehicle.

[0157] A battery 10-pack may include a plurality of battery cells 100, and the plurality of battery cells 100 may be connected in series, parallel, or series-parallel, with series-parallel connection referring to the plurality of battery cells 100 being connected in both series and parallel. The plurality of battery cells 100 may also be directly connected in series, parallel, or series-parallel, and then the entire battery 10 may be housed in a case 200. Of course, the battery 10 may also be formed by first connecting the plurality of battery cells 100 in series, parallel, or series-parallel to form a battery 10 module, and then connecting the plurality of battery 10 modules in series, parallel, or series-parallel to form the entire battery 10 and housed in the case 200.

[0158] The battery 10 may include other structures, such as bus members for establishing electrical connections between the battery cells 100 .

[0159] It should be understood that in this example, only the battery 10 including the battery cell 100 is described, and the battery 10 may further include other functional components, the description of which will be omitted here.

[0160] Since the battery 10 includes the battery cell 100 provided by the above embodiment, the battery 10 includes at least all the technical effects of the battery cell 100, and the description thereof will be omitted here.

[0161] This embodiment provides an electric device 1 including a battery 10 for providing electric energy in the above embodiment.

[0162] Since the electrical device 1 includes the battery 10, it has at least all the beneficial effects of the battery 10, the description of which is omitted here.

[0163] The electric device 1 includes, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, a power tool, an electric scooter, an electric car, a boat, a spacecraft, etc. Among them, the electric toy may include a stationary or mobile electric toy, such as a game console, an electric car toy, an electric boat toy, and an electric airplane toy, and the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.

[0164] For ease of explanation, the following embodiment will be described by taking an example in which the electric device 1 in one embodiment of the present application is a vehicle. The vehicle may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range-extended vehicle, etc. A battery 10 is installed inside the vehicle, and may be installed at the bottom, head, or tail of the vehicle. The battery 10 is used to supply power to the vehicle, for example, the battery 10 can function as an operating power source for the vehicle. The vehicle may further include a controller and a motor, and the controller controls the battery 10 to supply power to the motor, for example, to meet the operating power demands during vehicle starting, navigation, and driving.

[0165] In some embodiments of the present application, the battery 10 can be used not only as a vehicle operating power source, but also as a vehicle traction power source, replacing or partially replacing fuel or natural gas to provide power for the vehicle.

[0166] 3 to 8, in one specific embodiment of this embodiment, a battery cell 100 is provided, which includes an outer casing 110, an electrode assembly 120, a separator structure 170, and an insulating sheet 160. The outer casing 110 has an internal cavity, and the outer casing 110 has a first wall 111, which is specifically a bottom wall of the outer casing 110, and the first wall 111 is parallel to the X direction and the Y direction. The electrode assembly 120 and the separator structure 170 are both mounted in the internal cavity, with at least a portion of the separator structure 170 located between the first wall 111 and the electrode assembly 120, and a first through-hole 150 provided in the separator structure 170, the first through-hole 150 being provided in a region of the separator structure 170 located between the first wall 111 and the electrode assembly 120, and the first through-hole 150 being provided penetrating the separator structure 170 along the Z direction. The separator structure 170 includes a baffle 140 and an insulating film 130 wrapped around the outside of the electrode assembly 120 and at least a portion of which is located between the electrode assembly 120 and the first wall 111. Specifically, the insulating film 130 includes a first film layer 131 positioned between the electrode assembly 120 and the first wall 111, and a second film layer 132 wrapped around at least a portion of the circumferential side of the electrode assembly 120, and the first film layer 131 and the second film layer 132 are of an integral structure. Specifically, the insulating film 130 is an entire film layer, and the second film layer 132 is divided into two parts, called the first sub-film layer and the second sub-film layer, respectively. The first sub-film layer and the second sub-film layer are located on opposite sides of the first film layer 131, respectively. In the X direction, first folding edges 132a are respectively provided on both sides of the first sub-film layer, and second folding edges 132b are respectively provided on both sides of the second sub-film layer. The first folding edges 132a and the second folding edges 132b are respectively provided in one-to-one correspondence. After folding, one of the first folding edges 132a has a partial overlapping area with one of the second folding edges 132b, and another first folding edge 132a has a partial overlapping area with another second folding edge 132b.The number of insulating sheets 160 is the same as the number of first folded edges 132a. In this embodiment, the number of first folded edges 132a is two, and the number of insulating sheets 160 is also two. Each insulating sheet 160 includes one first portion 161 and one second portion 162. The first portion 161 and the second portion 162 have equal dimensions in the Y direction. One of the second portions 162 fixes one of the first folded edges 132a and one of the second folded edges 132b, and another second portion 162 fixes another of the first folded edges 132a and another of the second folded edges 132b. In the Y-axis direction, the distances between the second portion 162 and both side edges of the separator structure 170 are equal, and the second portion 162 is connected to the first folded edge 132 a and the second folded edge 132 b by an adhesive, so that when the folds between the first folded edge 132 a and the second folded edge 132 b are located in non-edge regions of the electrode assembly 120, the second portion 162 can achieve a relatively good fixing effect to both the first folded edge 132 a and the second folded edge 132 b. The separator member is disposed between the insulating film 130 and the first wall 111, specifically, between the first film layer 131 of the insulating film 130 and the first wall 111. The first communication hole 150 includes a first hole section 151 and a second hole section 152, the first hole section 151 is arranged opposite the second hole section 152 and they communicate with each other, the first hole section 151 is arranged in the first film layer 131 of the insulating film 130 and the first hole section 151 passes through the first film layer 131 of the insulating film 130, and the second hole section 152 is arranged in the baffle 140 and passes through the baffle 140. The number of first communication holes 150 is equal to the number of insulating sheets 160, and in this embodiment, the number of insulating sheets 160 is two and the number of first communication holes 150 is also two. The first portion 161 of one insulating sheet 160 covers one first communication hole 150, and the first portion 161 of another insulating sheet 160 covers another first communication hole 150. Specifically, the first portion 161 covers one side of the second hole section 152 of the corresponding first communication hole 150 that is away from the first hole section 151, i.e., the first portion 161 is adhered to one side of the baffle 140 that faces the first wall 111, and covers the corresponding first hole section 151.

[0167] 18 and 19, in another specific embodiment of this embodiment, a battery cell 100 is provided, which includes an outer casing 110, an electrode assembly 120, a separator structure 170, and an insulating sheet 160. The outer casing 110 has an internal cavity and a first wall 111, which is specifically the bottom wall of the outer casing 110, and which is parallel to the X and Y directions. The electrode assembly 120 and the separator structure 170 are both mounted in the internal cavity, with at least a portion of the separator structure 170 located between the first wall 111 and the electrode assembly 120. A first through-hole 150 is provided in the separator structure 170, and the first through-hole 150 is provided in a region of the separator structure 170 located between the first wall 111 and the electrode assembly 120, with the first through-hole 150 penetrating the separator structure 170 along the Z direction. The separator structure 170 includes a baffle 140, an insulating film 130, and a support block 180. The insulating film 130 is wrapped around the outside of the electrode assembly 120, and at least a portion of the insulating film 130 is located between the electrode assembly 120 and the first wall 111. Specifically, the insulating film 130 includes a first film layer 131 positioned between the electrode assembly 120 and the first wall 111, and a second film layer 132 wrapped around at least a portion of the circumferential side of the electrode assembly 120, and the first film layer 131 and the second film layer 132 are of an integral structure.Specifically, the insulating film 130 is an entire film layer, and the second film layer 132 is divided into two parts, called the first sub-film layer and the second sub-film layer, respectively. The first sub-film layer and the second sub-film layer are located on opposite sides of the first film layer 131, respectively. In the X direction, first folding edges 132a are respectively provided on both sides of the first sub-film layer, and second folding edges 132b are respectively provided on both sides of the second sub-film layer. The first folding edges 132a and the second folding edges 132b are respectively provided in one-to-one correspondence. After folding, one of the first folding edges 132a has a partial overlapping area with one of the second folding edges 132b, and another first folding edge 132a has a partial overlapping area with another second folding edge 132b. The number of insulating sheets 160 is the same as the number of first folded edges 132a. In this embodiment, the number of first folded edges 132a is two, and the number of insulating sheets 160 is also two. Each insulating sheet 160 includes one first portion 161 and one second portion 162. The first portion 161 and the second portion 162 have equal dimensions in the Y direction. One of the second portions 162 fixes one of the first folded edges 132a and one of the second folded edges 132b, and another second portion 162 fixes another of the first folded edges 132a and another of the second folded edges 132b. The separator member is disposed between the insulating film 130 and the first wall 111, specifically between the first film layer 131 of the insulating film 130 and the first wall 111, and the support block 180 is disposed on one side of the baffle 140 facing the first wall 111. Second communication holes 181 are disposed in the support block 180, and the second communication hole 181 of at least one support block 180 is disposed to face the first communication hole 150, and the first portion 161 covers the second communication hole 181.The first communication hole 150 includes a first hole section 151 and a second hole section 152, the first hole section 151 is arranged opposite to the second hole section 152 and they communicate with each other, the first hole section 151 is arranged in the first film layer 131 of the insulating film 130 and the first hole section 151 penetrates the first film layer 131 of the insulating film 130, and the second hole section 152 is arranged in the baffle 140 and the second hole section 152 penetrates the baffle 140. The first hole sections 151 are arranged in one-to-one correspondence with the second hole sections 152, and the second communication holes 181 are arranged in one-to-one correspondence with the second hole sections 152 of the corresponding first communication hole 150. Specifically, the baffle 140 has two second hole sections 152 of the first communication holes 150, the center line of the baffle 140 along the width direction is P1, and the two second hole sections 152 are both located in an area close to one side of the baffle 140 in the width direction, i.e., the two first communication holes 150 are both located on the same side of P1. There are four support blocks 180, and two support blocks 180 have second communication holes 181, each of which is located opposite the first communication hole 150, and the second communication holes 181 in the support blocks 180 communicate with the first communication hole 150. Two other support blocks 180 do not have second communication holes 181, and the other two support blocks 180 are located in an area where no first communication holes 150 are located. There are two insulating sheets 160, and a first portion 161 of one of the insulating sheets 160 is adhered to the surfaces of two support blocks 180 on one side of the baffle 140 along the longitudinal direction, facing away from the baffle 140, with the first portion 161 covering the second communication hole 181 of one of the support blocks 180. The first portion 161 of the other insulating sheet 160 is adhered to the surfaces of two support blocks 180 on the other side of the baffle 140 along the longitudinal direction, facing away from the baffle 140, with the first portion 161 covering the second communication hole 181 of one of the support blocks 180. In this embodiment, the baffle 140 is installed so that the third communication hole 1411 penetrates along the Z-axis direction, and there are multiple third communication holes 1411, and the multiple third communication holes 1411 are distributed at intervals between the two first communication holes 150.

[0168] Finally, it should be noted that the above embodiments are used only to explain the technical solutions of the present application and are not intended to limit the same. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should still understand that they can modify the technical solutions described in the above embodiments or equivalently replace some or all of the technical features thereof, and such modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and should all be included in the scope of the claims and description of the present application. In particular, as long as there is no structural contradiction, the technical features mentioned in the embodiments can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions included within the scope of the claims.

Claims

1. A battery cell, an outer casing having an interior cavity and a first wall; an electrode assembly disposed in the internal cavity; a separator structure, at least a portion of which is provided between the first wall and the electrode assembly, and a first communication hole is provided in a portion of the separator structure located between the first wall and the electrode assembly; an insulating sheet including a first portion that shields the first communication hole; A battery cell characterized by:

2. a plurality of the first communication holes are provided in the separator structure, and the insulating sheet covers all of the first communication holes; The battery cell according to claim 1 .

3. the number of the insulating sheets is equal to the number of the first communication holes, the insulating sheets are installed in one-to-one correspondence with the first communication holes, and the insulating sheets shield the corresponding first communication holes; or the number of the insulating sheets is one, and one insulating sheet shields all of the first communication holes; The battery cell according to claim 2 .

4. the first portion is adhered to the opening of the first communication hole; The battery cell according to claim 1 .

5. the first portion is located on one side of the separator structure toward the first wall; The battery cell according to any one of claims 1 to 4.

6. The separator structure includes a baffle located between the electrode assembly and the first wall, and an insulating film at least a portion of which is located between the electrode assembly and the first wall, the first communication hole including a first hole step and a second hole step disposed opposite to each other and communicating with each other, the first hole step being disposed in the insulating film, and the second hole step being disposed in the baffle, and the first portion shields an opening of the first hole step on one side remote from the second hole step or an opening of the second hole step on one side remote from the first hole step. The battery cell according to claim 1 .

7. the insulating film is folded and wrapped around the electrode assembly, forming a first folded edge and a second folded edge that overlap each other on the sides of the electrode assembly, the insulating sheet including a second portion that fixes the first folded edge and the second folded edge, and the first portion is connected to the second portion; The battery cell according to claim 6 .

8. In a first direction, the second portion is spaced apart from at least one edge of two spaced apart edges of the separator structure in the first direction, and the first direction is parallel to a width direction of the first wall. The battery cell according to claim 7 .

9. In the first direction, the distances between the second portion and opposite edges of the separator structure are equal. The battery cell according to claim 8 .

10. In the first direction, the width of the outer casing is W1, the width of the second portion is W2, and 0.1≦W2 / W1≦0.

9. The battery cell according to claim 9 .

11. 0.25≦W2 / W1≦0.75, The battery cell according to claim 10 .

12. The dimension of the second portion along the height direction of the electrode assembly is 10 mm to 80 mm. The battery cell according to claim 7 .

13. The dimension of the second portion along the height direction of the electrode assembly is 15 mm to 50 mm. The battery cell according to claim 12 .

14. Only two holes are provided in the baffle, and both of the two holes in the baffle are the first hole sections; only two holes are provided in the insulating film, and both of the two holes in the insulating film are the second hole sections; and the two first hole sections are arranged one-to-one opposite the two second hole sections. The battery cell according to claim 6 .

15. the separator structure further includes a support block, the baffle is disposed between the insulating film and the first wall, and the support block is disposed on one side of the baffle facing the first wall; The support block is installed in an area of ​​the baffle where the first communication hole is not installed, or a second communication hole is provided in the support block, and the second communication hole of at least one of the support blocks is provided to face the first communication hole, and the first part shields the second communication hole; The battery cell according to any one of claims 6 to 14.

16. A battery cell according to any one of claims 1 to 4 and 6 to 14, A battery characterized by:

17. 17. A battery according to claim 16, wherein the battery is adapted to provide electrical energy.

1. An electrical device comprising:

Images