Battery monomer, battery and electric device

Abstract

A battery cell, a battery and a power utilization device, the battery cell (100) comprising a housing (110), an electrode assembly (120), an isolation structure (170) and an insulating sheet (160), the housing (110) having an inner cavity and a first wall (111), the electrode assembly (120) being provided in the inner cavity, the isolation structure (170) being at least partially located between the first wall (111) and the electrode assembly (120), the isolation structure (170) being provided with a first through hole (150), the insulating sheet (160) comprising a first portion (161), the first portion (161) being provided with a second portion (162), and the second portion (162) being provided with a second through hole (162). The first portion (161) covers the first through hole (150). In the battery cell (100), the first portion (161) of the insulating sheet (160) covers the first through hole (150), and the probability that powder on one side of the electrode assembly (120) moves to one side of the first wall (111) through the first through hole (150) is reduced to a certain extent, thereby improving the reliability of the battery cell (100).

Description

Battery cells, batteries and electrical devices

[0001] This application claims priority to application number 202310341097.1 filed on March 31, 2023, entitled “Battery Cell, Battery and Electrical Device,” the contents of which are incorporated by reference into this application. Technical Field

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

[0003] During battery production, an isolation structure with through-holes is placed between the electrode assembly and the outer casing. Powder on one side of the electrode assembly can easily migrate through the through-holes into the space between the isolation structure and the outer casing, causing short circuits or corrosion in the battery cells.

[0004] Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a battery cell, a battery, and an electrical device, aiming to solve the technical problems of short circuit or corrosion of battery cells in the prior art.

[0006] To achieve the above objectives, the technical solution adopted in this application is:

[0007] In a first aspect, a battery cell is provided, comprising:

[0008] a housing, the housing having an interior cavity and a first wall;

[0009] an electrode assembly, disposed in the inner cavity;

[0010] an isolation structure, the isolation structure being disposed between the first wall and the electrode assembly, the isolation structure being provided with a first through hole; and

[0011] The insulating sheet includes a first portion, and the first portion covers the first through hole.

[0012] In this setting, the electrode assembly is located inside the outer shell, and the isolation structure is located between the first wall of the outer shell and the electrode assembly. Since the insulating sheet covers the first through hole, the setting of the insulating sheet can reduce the probability of powder on one side of the electrode assembly moving through the first through hole to the side of the first wall to a certain extent, thereby improving the reliability of the battery cell.

[0013] In a possible design, the isolation structure is provided with a plurality of first through holes, and the insulating sheet covers all the first through holes.

[0014] In this arrangement, since the insulating sheet covers all the first through holes, the probability of powder on one side of the electrode assembly moving to the side of the first wall through the first through holes is reduced when there are multiple first through holes.

[0015] In one possible design, the number of insulating sheets is equal to the number of first through holes, the insulating sheets are arranged in a one-to-one correspondence with the first through holes, and the insulating sheets cover the corresponding first through holes; or, the number of insulating sheets is one, and one insulating sheet covers all first through holes.

[0016] In this arrangement, when one insulating sheet is provided for each first through hole, the size of each insulating sheet is relatively small, reducing the space occupied by the insulating sheet. When one insulating sheet is used to cover all first through holes, the assembly efficiency of the insulating sheet is high.

[0017] In a possible design, the first part is adhered to the opening of the first through hole.

[0018] In this arrangement, fixing the first portion by gluing can provide a better covering effect of the first portion on the first through hole.

[0019] In a possible design, the first portion is located on a side of the isolation structure facing the first wall.

[0020] In this setting, during the assembly process, the electrode assembly can be connected to the isolation structure first, and then the first part can be covered on the isolation structure, and the first part can be set on the side of the isolation structure facing the first wall, so as to facilitate the connection operation of the first part and the isolation structure after the isolation structure is connected to the electrode assembly.

[0021] In one possible design, the isolation structure includes a baffle and an insulating film, the baffle is located between the electrode assembly and the first wall, at least a portion of the insulating film is located between the electrode assembly and the first wall, the first through hole includes a first hole segment and a second hole segment that are oppositely arranged and connected, the first hole segment is arranged on the insulating film, the second hole segment is arranged on the baffle, and the first portion covers the opening on one side of the first hole segment away from the second hole segment or the opening on the side of the second hole segment away from the first hole segment.

[0022] In this arrangement, since the insulating film is provided with a first hole segment and the baffle is provided with a second hole segment, the insulating film and the baffle can be positioned by the first and second hole segments. Since the first portion covers the side of the first hole segment away from the second hole segment, or vice versa, the first portion can be connected after the insulating film and the baffle are connected.

[0023] In one possible design, the insulating film is folded and wrapped around the electrode assembly, and forms a first fold edge and a second fold edge that overlap each other on the side of the electrode assembly. The insulating sheet includes a second part, the second part fixes the first fold edge and the second fold edge, and the first part is connected to the second part.

[0024] In this arrangement, the insulating sheet not only covers the first through hole but also secures the first and second folded edges. Because the insulating sheet comprises a first portion and a second portion connected to each other, the contact area between the insulating sheet and the isolation structure is increased, thereby improving the connection stability between the insulating sheet and the isolation structure.

[0025] In a possible design, in a first direction, the second portion is spaced apart from at least one edge of the isolation structure in the first direction, and the first direction is parallel to a width direction of the first wall.

[0026] In this arrangement, since the second part is spaced apart from at least one edge of the isolation structure, that is, in the first direction, the size of the second part is smaller than the size of the isolation structure, it is convenient to flatly attach the second part to the insulating film, thereby reducing the space occupied by the second part.

[0027] In a possible design, in the first direction, the distances between the second portion and two side edges of the isolation structure are equal.

[0028] In this arrangement, the second portion is adhered to the middle region of the insulating film, so as to facilitate fixing the first folded edge and the second folded edge.

[0029] In a possible design, in the first direction, the width of the outer shell is W1, the width of the second portion is W2, and 0.1≤W2 / W1≤0.9.

[0030] In this arrangement, the width of the second portion can be set according to the width of the shell, and the width of the second portion is sufficient to fix the first folded edge and the second folded edge.

[0031] In one possible design, 0.25≤W2 / W1≤0.75.

[0032] In this arrangement, the width of the second portion occupies a smaller space while still meeting the requirements of fixing the first folding edge and the second folding edge.

[0033] In a possible design, along the height direction of the electrode assembly, the size of the second portion is 10 mm-80 mm.

[0034] In this arrangement, the height of the second portion may be sufficient to fix the first folded edge and the second folded edge.

[0035] In a possible design, along the height direction of the electrode assembly, the size of the second portion is 15 mm-50 mm.

[0036] In this arrangement, the height of the second portion occupies a small space while still meeting the requirements for fixing the first folding edge and the second folding edge.

[0037] In one possible design, only two holes are provided on the baffle plate, and both holes on the baffle plate are first hole segments; only two holes are provided on the insulating membrane, and both holes on the insulating membrane are second hole segments, and the two first hole segments and the two second hole segments are arranged one by one opposite to each other.

[0038] In this setting, only a first hole segment is provided on the baffle plate, and no other holes are provided; only a second hole segment is provided on the insulating film, and no other holes are provided; the first hole segment and the second hole segment are connected one-to-one to form a first through hole, and the first through hole is blocked by the first part of the insulating sheet, so that the baffle plate and the insulating sheet have a better blocking effect on the powder on one side of the electrode assembly.

[0039] In one possible design, the isolation 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 a side of the baffle facing the first wall;

[0040] The first through hole penetrates the baffle plate and the insulating film, and the support block is provided in an area of ​​the baffle plate where the first through hole is not provided; or,

[0041] The support block is provided with a second through hole. The second through hole of at least one support block is arranged opposite to the first through hole, and the first part covers the second through hole.

[0042] In this arrangement, a support block is provided on the isolation structure, which can enhance the structural strength of the isolation structure. When the support block is provided in an area where the first through-hole is not provided, the first portion can simply cover the first through-hole. When the support block is provided in an area opposite the first through-hole, since the support block is provided with a second through-hole, which is opposite the first through-hole, the first portion can cover the first through-hole by covering the second through-hole, thereby reducing the probability of powder on one side of the electrode assembly migrating to the side of the first wall via the first through-hole.

[0043] In a second aspect, a battery is provided, comprising the battery cell provided by the above technical solution.

[0044] Since the battery includes the above-mentioned battery cell, it has at least all the beneficial effects of the above-mentioned battery cell, which will not be described in detail here.

[0045] In a third aspect, an electrical device is provided, which includes the battery provided by the above technical solution, and the battery is used to provide electrical energy.

[0046] Since the electrical device includes the above-mentioned battery, it has at least all the beneficial effects of the above-mentioned battery, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0048] FIG1 is a schematic structural diagram of an electric device provided by an embodiment of the present application;

[0049] FIG2 is a schematic structural diagram of a battery provided by one embodiment of the present application;

[0050] FIG3 is an exploded view of parts of a battery cell provided in the first embodiment of the present application;

[0051] FIG4 is a schematic diagram of the relative positions of the insulating sheet and the isolation structure in the battery cell of FIG3 ;

[0052] FIG5 is a schematic structural diagram of the insulating sheet in FIG4 ;

[0053] FIG6 is a schematic diagram of the expansion of the insulating sheet in the battery cell in FIG3 ;

[0054] FIG7 is a schematic structural diagram of a battery cell provided in the first embodiment of the present application at one viewing angle;

[0055] FIG8 is a schematic structural diagram of a battery cell provided by the first embodiment of the present application from another perspective;

[0056] FIG9 is a schematic diagram showing the relative positions of the insulating sheet and the isolation structure in the battery cell provided by the second embodiment of the present application;

[0057] FIG10 is a schematic structural diagram of the insulating sheet in FIG9;

[0058] FIG11 is a schematic structural diagram of a battery cell provided in a second embodiment of the present application at one viewing angle;

[0059] FIG12 is a schematic diagram showing the relative positions of the insulating sheet and the isolation structure in the battery cell provided by the third embodiment of the present application;

[0060] FIG13 is a schematic structural diagram of the insulating sheet in FIG12;

[0061] FIG14 is a schematic structural diagram of a battery cell provided in a third embodiment of the present application at a certain viewing angle;

[0062] FIG15 is a schematic diagram showing the relative positions of the insulating sheet and the isolation structure in the battery cell provided in the fourth embodiment of the present application;

[0063] FIG16 is a schematic structural diagram of the insulating sheet in FIG15;

[0064] FIG17 is a schematic structural diagram of a battery cell provided in a fourth embodiment of the present application at one viewing angle;

[0065] FIG18 is a schematic diagram showing the relative positions of the insulating sheet and the isolation structure in the battery cell provided in the fifth embodiment of the present application;

[0066] FIG19 is a schematic structural diagram of a battery cell provided in a fifth embodiment of the present application at one viewing angle;

[0067] FIG20 is a schematic diagram of the relative positions of the insulating sheet and the isolation structure in the battery cell provided in the sixth embodiment of the present application;

[0068] FIG21 is a schematic structural diagram of a battery cell provided in a sixth embodiment of the present application at one viewing angle;

[0069] FIG22 is a schematic diagram showing the relative positions of the insulating sheet and the isolation structure in the battery cell provided in the seventh embodiment of the present application;

[0070] FIG23 is a schematic structural diagram of a battery cell provided in a seventh embodiment of the present application at one viewing angle;

[0071] FIG24 is a schematic diagram showing the relative positions of the insulating sheet and the isolation structure in the battery cell provided in the eighth embodiment of the present application;

[0072] FIG25 is a schematic structural diagram of a battery cell provided in an eighth embodiment of the present application at one viewing angle;

[0073] FIG26 is a schematic diagram showing the relative positions of the insulating sheet and the isolation structure in the battery cell provided in the ninth embodiment of the present application;

[0074] FIG27 is a schematic structural diagram of a battery cell provided in the ninth embodiment of the present application at a certain viewing angle.

[0075] The numbers involved in the above drawings are detailed as follows: 1. Electrical device; 10. Battery; 20. Control mechanism; 30. Drive mechanism; 100. Battery cell; 200. Box body; 101. Top cover patch; 102. Top cover; 103. Adapter; 104. Protective film; 110. Outer shell; 111. First wall; 120. Electrode assembly; 122. Tab; 130. Insulating film; 131. First film layer; 132. Second film layer; 132a. First folding edge; 132b. Second folding edge; 140. Baffle; 1411. Third through hole; 150. First through hole; 151. First hole section; 152. Second hole section; 160. Insulating sheet; 161. First part; 162. Second part; 170. Isolation structure; 180. Support block; 181. Second through hole. DETAILED DESCRIPTION

[0076] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0077] In the description of the embodiments of the present application, the term "plurality" refers to more than two (including two).

[0078] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0079] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the battery cells or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0080] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0081] In the embodiments of the present application, the battery cells may be secondary batteries, which are batteries that can be recharged to activate the active materials after discharge and continue to be used. The battery cells may be lithium-ion batteries, sodium-ion batteries, sodium-potassium-ion batteries, lithium metal batteries, sodium metal batteries, potassium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc., and the embodiments of the present application are not limited thereto.

[0082] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery.

[0083] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0084] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0085] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0086] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or iron, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0087] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphate, transition metal oxide and their respective modified compounds. However, the present application is not limited to these materials and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0088] In some embodiments, a positive electrode may utilize a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam, among others. When a metal foam is used as the positive electrode, the surface of the metal foam may or may not include a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled or / and deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0089] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0090] As examples, the negative electrode current collector may be a metal foil, metal foam, or a composite current collector. For example, the metal foil may include silver-surface-treated aluminum or stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium. The composite current collector may include a polymer base layer and a metal layer. The metal foam may include nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, or silver alloy) on a polymer substrate (such as a substrate made of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene). As examples, the negative electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may include silver-surface-treated aluminum or stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium. The composite current collector may include a polymer base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, iron, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0091] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0092] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0093] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate.

[0094] 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 the metal foam is used as the negative electrode sheet, the surface of the metal foam may or may not be provided with a negative electrode active material.

[0095] As an example, the negative electrode current collector may be filled with or / and deposited with a lithium source material, potassium metal, or sodium metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0096] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0097] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0098] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0099] As an example, the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride and ceramics.

[0100] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0101] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and the electrolyte can be selected based on needs. The electrolyte can be liquid, gel, or solid.

[0102] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0103] In some embodiments, the electrode assembly is a laminate structure.

[0104] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0105] As an example, multiple positive electrode sheets may be provided, and the negative electrode sheet may be folded to form multiple stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0106] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0107] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0108] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0109] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0110] In some embodiments, the electrode assembly is provided with tabs, which can conduct current from the electrode assembly, and the tabs include a positive tab and a negative tab.

[0111] In some embodiments, a battery cell may include a housing that is used to encapsulate components such as an electrode assembly and an electrolyte.

[0112] In one example, the shell includes a shell and an end cover assembly, the shell has an opening, and the end cover assembly covers the opening of the shell to form an inner cavity with the shell. The shell can be a steel shell, an aluminum shell, a plastic shell, a composite metal shell, or an aluminum-plastic film, etc.

[0113] The end cap assembly consists of a top cap and a top cap patch, which is located on the side of the top cap away from the housing. Electrode terminals, including positive and negative terminals, are mounted on the top cap. The positive tab connects to the positive terminal, and the negative tab connects to the negative terminal. The tabs connect to the electrode terminals via adapters. The adapters prevent damage to the battery or burns to other components in the event of a short circuit, overcharge, or over-discharge in the electrode assembly, thereby ensuring safe battery operation.

[0114] An isolation structure is provided between the electrode assembly and the shell, and a protective film is attached to the outer side of the shell.

[0115] In some embodiments, a pressure relief mechanism is provided on the housing, and the pressure relief mechanism is used to release the internal pressure of the battery cell. As an example, when the internal pressure or temperature of the battery cell reaches a predetermined threshold, it is actuated 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 performs an action or the weak structure provided in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies according to different design requirements. The threshold may depend on the material of one or more of the positive electrode sheet, negative electrode sheet, electrolyte and separator in the battery cell. As an example, the pressure relief mechanism can be integrally formed with the housing. As an example, the pressure relief mechanism can also be provided separately from the housing and connected. The "activation" mentioned in this application means that the pressure relief mechanism produces an action or is activated to a certain state, so that the internal pressure and temperature of the battery cell can be released. The action produced by the pressure relief mechanism may include but is not limited to: the components in the pressure relief mechanism move to form an exhaust channel, at least a part of the pressure relief mechanism ruptures, breaks, tears or opens, etc. When the pressure relief mechanism is activated, high-temperature, high-pressure substances within the battery cell are discharged from the activated portion as emissions. This allows pressure and temperature relief within the battery cell under controllable pressure or temperature, thereby avoiding potentially more serious accidents. Emissions from the battery cell mentioned in the embodiments of this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode sheets, separator fragments, high-temperature, high-pressure gases generated by the reaction, and flames.

[0116] The battery mentioned 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, in parallel or in hybrid through a busbar.

[0117] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0118] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0119] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0120] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0121] New energy vehicles have experienced rapid growth in recent years. Within the electric vehicle sector, power batteries, as the power source, play an irreplaceable and important role. A battery consists of a housing and multiple cells housed within it. As a core component in new energy vehicles, batteries have high requirements for both safety and cycle life.

[0122] In related designs, in order to achieve airflow on both sides of the isolation structure, or to facilitate the positioning and installation of the isolation structure, through holes are provided on the isolation structure. The through holes are provided on both sides of the isolation structure to form channels, so that the powder (such as anode powder) on one side of the electrode assembly can move to the other side of the isolation structure through the through holes. The powder contacts the shell on the other side of the isolation structure, which can easily cause the battery cell to short-circuit or corrode. Exemplarily, the isolation structure includes an insulating film and a bottom support plate. The insulating film and the bottom support plate are both provided with through holes, and the through holes on the insulating film and the through holes on the bottom support plate are arranged relative to each other for positioning the insulating film and the bottom support plate, so as to facilitate the connection of 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 on the insulating film and the through holes on the bottom support plate are connected to form a channel, so that the powder moves from one side of the electrode assembly through the channel to the other side of the isolation structure and contacts the shell, which can easily cause the battery cell to short-circuit, affecting the stability of the battery cell.

[0123] Based on the above considerations, and to address the aforementioned issues, a battery cell was designed. The battery cell comprises a housing, an electrode assembly, an isolation structure, and an insulating sheet. The isolation structure is positioned between the electrode assembly and the first wall of the housing. A first through-hole is provided in the isolation structure, and the insulating sheet covers the first through-hole. Because the first through-hole is blocked, powder on one side of the electrode assembly can migrate through the through-hole to the other side of the isolation structure.

[0124] The battery cell provided in this embodiment can be used in batteries, and the battery can be used in electrical devices, including but not limited to: mobile phones, portable devices, laptops, electric cars, electric vehicles, ships, spacecraft, electric toys and electric tools, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric cutters. Electrical devices include, but are not limited to: mobile phones, portable devices, laptop computers, electric vehicles, electric cars, electric vehicles, ships, spacecraft, electric toys and electric tools, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0125] Referring to Figures 1 and 2 , for ease of description, this example uses a vehicle as an example of an electrical device 1. The vehicle can be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an augmented-range vehicle, among others. A drive mechanism 30, a control mechanism 20, and a battery 10 can be installed within the vehicle. The drive mechanism 30 can be a motor, for example, and the control mechanism 20 is used to control the battery 10 to power the drive mechanism 30. For example, the battery 10 can be installed at the bottom, front, or rear of the vehicle. The battery 10 can be used to power other devices in the vehicle. For example, the battery 10 can serve as the vehicle's operating power source and be used for the vehicle's circuit system, such as for starting, navigation, and operating power requirements. In another example, the battery 10 can serve not only as the vehicle's operating power source, but also as the vehicle's driving power source, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle. The vehicle in this example uses the aforementioned battery 10, and by improving the reliability of the battery 10, it can help improve the reliability of the electrical device 1.

[0126] Referring to Figures 3 to 8, this embodiment provides a battery cell 100 including a shell 110, an electrode assembly 120, an isolation structure 170 and an insulating sheet 160, wherein the shell 110 has an inner cavity, and the shell 110 has a first wall 111, the electrode assembly 120 is arranged in the inner cavity, the isolation structure 170 is arranged between the first wall 111 and the electrode assembly 120, and a first through hole 150 is provided on the portion of the isolation structure 170 located between the first wall 111 and the electrode assembly 120, and the insulating sheet 160 includes a first part 161, and the first part 161 covers the first through hole 150.

[0127] The outer shell 110 forms the outer casing structure of the battery cell 100. The outer shell 110 is at least partially hollow to form an inner cavity. The outer shell 110 has a first wall 111. The first wall 111 is one of the wall surfaces of the outer shell 110. The first wall 111 can be at least one of the bottom wall, top wall, or side wall of the outer shell 110. The outer shell 110 can be aluminum or other materials.

[0128] In some examples, the housing 110 includes a shell and an end cap assembly. The outer side of the shell is affixed with a protective film 104. The shell has an opening, and the end cap assembly covers the opening of the shell to form an inner cavity with the shell. The shell can be a steel shell, an aluminum shell, a plastic shell, a composite metal shell, or an aluminum-plastic film. The first wall 111 can be located on the shell or on the end cap assembly. The electrode assembly 120 is installed in the inner cavity. The electrode assembly 120 can be a wound structure or a laminated structure. The electrode assembly 120 can be placed into the inner cavity through the opening of the shell. The electrode assembly 120 includes tabs 122, which include positive and negative tabs. The end cap assembly includes a top cap 102 and a top cap patch 101. The top cap patch 101 is located on the side of the top cap 102 away from the shell. Terminals are mounted on the top cap 102. The electrode terminals include a positive terminal and a negative terminal. The positive tab is connected to the positive terminal, and the negative tab is connected to the negative terminal. The tabs 122 are connected to the electrode terminals via adapters 103. The adapters 103 are used to prevent damage to the battery 10 or burn of other components when the electrode assembly 120 is short-circuited or overcharged or over-discharged, thereby ensuring the safety of the battery.

[0129] The electrode assembly 120 is installed in the inner cavity. The electrode assembly 120 can be a wound structure or a laminated structure. The electrode assembly 120 can be placed into the inner cavity of the outer shell 110 through an opening on the outer shell 110 .

[0130] The isolation structure 170 is installed in the inner cavity and is at least partially located between the first wall 111 and the electrode assembly 120. The isolation structure 170 is used to create a barrier between the first wall 111 and the electrode assembly 120 so that the electrode assembly 120 cannot contact the first wall 111. The isolation structure 170 can be made of an insulating material.

[0131] Because the isolation structure 170 is located between the electrode assembly 120 and the first wall 111 of the outer shell 110, the possibility of a short circuit in the electrode assembly 120 is reduced, thereby improving the reliability of the battery cell 100. Due to the obstruction of the isolation structure 170, even if the outer shell 110 undergoes some deformation, the isolation structure 170 can still isolate the first wall 111 from the electrode assembly 120, thereby reducing the risk of short circuits caused by contact between the electrode assembly 120 and the first wall 111.

[0132] The isolation structure 170 can be made of insulating material.

[0133] In this example, the isolation structure 170 is at least partially located between the first wall 111 and the electrode assembly 120. A first through-hole 150 is provided on the isolation structure 170. The first through-hole 150 is provided in the region of the isolation structure 170 between the first wall 111 and the electrode assembly 120. The first through-hole 150 is provided through the isolation structure 170. The first through-hole 150 can be used to position the isolation structure 170 during assembly. For example, the first through-hole 150 can be used to allow a positioning structure to pass through, so that the positioning structure can locate the installation position of the isolation structure 170 to facilitate installation of the isolation structure 170. Alternatively, when the isolation structure 170 includes multiple components, the first through-hole 150 passes through at least two of the components, and the first through-hole 150 allows the positioning structure to pass through to align the at least two components of the isolation structure 170 through which the first through-hole 150 is provided, so as to facilitate assembly of the isolation structure 170 itself.

[0134] In the drawings of this embodiment, the length direction of the battery cell 100 is shown as the X direction, the width direction is shown as the Y direction, and the height direction is shown as the Z direction. The X direction, Y direction, and Z direction are perpendicular to each other. The X direction, Y direction, and Z direction do not point to a single direction or a single position. The direction parallel to the X direction is referred to as the X direction, the direction parallel to the Y direction is referred to as the Y direction, and the direction parallel to the Z direction is referred to as the Z direction.

[0135] Exemplarily, both the X direction and the Y direction are parallel to the first wall 111 , and the first through hole 150 passes through the isolation structure 170 along the Z direction.

[0136] First portion 161 of insulating sheet 160 is used to cover first through-hole 150, thereby blocking flow on both sides of first through-hole 150. This can, to a certain extent, reduce or even prevent powder on one side of electrode assembly 120 from migrating through first through-hole 150 to first wall 111. For example, first portion 161 can be positioned on the side of isolation structure 170 near first wall 111, covering first through-hole 150; first portion 161 can be positioned on the side of isolation structure 170 near electrode assembly 120, covering first through-hole 150; or first portion 161 can at least partially extend into first through-hole 150 to block and cover first through-hole 150. First through-hole 150 is used for positioning and installing isolation structure 170. After isolation structure 170 is positioned, first portion 161 covers first through-hole 150, blocking flow through first through-hole 150. The first portion 161 covering the first through hole 150 means that the projection of the first portion 161 overlaps with the projection of the first through hole 150 , or in other words, in a plane parallel to the first wall 111 , the projection of the first through hole 150 is completely located within the projection of the first portion 161 .

[0137] In this setting, the electrode assembly 120 is located inside the outer shell 110, and the isolation structure 170 is located between the first wall 111 of the outer shell 110 and the electrode assembly 120. Since the insulating sheet 160 covers the first through hole 150, the setting of the insulating sheet 160 can reduce the probability of powder on one side of the electrode assembly 120 moving through the first through hole 150 to the side of the first wall 111 to a certain extent, thereby improving the reliability of the battery cell 100.

[0138] The insulating sheet 160 can be a film structure with a relatively small thickness, thus occupying a small space. For example, the thickness of the insulating sheet 160 can be 0.01 mm to 0.5 mm. For example, the thickness of the insulating sheet 160 can be 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, 0.5 mm, etc. The thickness of the insulating sheet 160 is the vertical distance between the side of the insulating sheet 160 facing the isolation structure 170 and the opposite side. The thickness of the first portion 161 located between the first wall 111 and the isolation 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 prevent powder or liquid from passing through, thereby covering the first through hole 150, and within this size range, the insulating sheet 160 has a relatively small thickness, occupies a small space, and is lightweight.

[0139] In a possible design, the isolation structure 170 is provided with a plurality of first through holes 150 , and the insulating sheet 160 covers all the first through holes 150 .

[0140] To achieve more stable positioning, a plurality of first through holes 150 are provided on the isolation structure 170. The plurality of first through holes 150 are all provided in the area of ​​the isolation structure 170 between the first wall 111 and the electrode assembly 120, and the plurality of first through holes 150 are spaced apart. The plurality of first through holes 150 can allow a plurality of positioning structures to pass through, so that the isolation structure 170 can be positioned by the plurality of positioning structures, resulting in a better positioning effect and higher stability. After positioning is completed, the insulating sheet 160 covers all the first through holes 150. Therefore, after the battery cell 100 is assembled, all the first through holes 150 are blocked by the insulating sheet 160, so that any first through hole 150 is blocked to prevent powder from moving to the other side of the isolation structure 170 through one or more first through holes 150. In this arrangement, since the insulating sheet 160 covers all the first through holes 150, the probability of powder on one side of the electrode assembly 120 moving to the side of the first wall 111 through the first through holes 150 is reduced when there are multiple first through holes 150.

[0141] In an optional embodiment, the number of insulating sheets 160 is equal to the number of first through holes 150 , and the insulating sheets 160 are arranged in a one-to-one correspondence with the first through holes 150 , and the insulating sheets 160 cover the corresponding first through holes 150 ; or, the number of insulating sheets 160 is one, and one insulating sheet 160 covers all first through holes 150 .

[0142] That is, when there are multiple first through holes 150, there can be one or more insulating sheets 160. As shown in Figures 9 to 14, when there is only one insulating sheet 160, the insulating sheet 160 can cover all first through holes 150. As shown in Figures 7, 8, and 15 to 17, when there are multiple insulating sheets 160, one insulating sheet 160 can be used to cover one or more first through holes 150.

[0143] For example, the number of first through holes 150 is four, and the number of insulating sheets 160 can be one, two, three, or four. When there is one insulating sheet 160, the insulating sheet 160 blocks four first through holes 150. When there are two insulating sheets 160, one insulating sheet 160 can block one first through hole 150, and the other insulating sheet 160 can block three first through holes 150, or each of the two insulating sheets 160 can block two first through holes 150. When there are three insulating sheets 160, one insulating sheet 160 blocks two first through holes 150, and the other two insulating sheets 160 each block one first through hole 150. When there are four insulating sheets 160, each insulating sheet 160 blocks one first through hole 150.

[0144] As shown in Figures 7 and 8, in an optional embodiment, the number of insulating sheets 160 is equal to the number of first through holes 150, and the insulating sheets 160 are arranged in a one-to-one correspondence with the first through holes 150, and the insulating sheets 160 cover the corresponding first through holes 150. For example, when there are two first through holes 150, there are two insulating sheets 160, and the first portion 161 of one insulating sheet 160 covers one first through hole 150, and the first portion 161 of the other insulating sheet 160 covers the other first through hole 150. In this arrangement, since one insulating sheet 160 only needs to cover one first through hole 150, the size of the insulating sheet 160 is relatively small, reducing the space occupied by the insulating sheet 160.

[0145] The insulating sheet 160 may be made of an insulating tape (such as insulating blue tape), an insulating film 130 (such as insulating blue film), or other materials capable of achieving an insulating effect.

[0146] In a possible design, the first portion 161 may be connected to the isolation structure 170 by hot melting and cover the first through hole 150 .

[0147] Alternatively, in another possible design, the first portion 161 is adhered to the opening of the first through hole 150 .

[0148] Since the first through hole 150 passes through the isolation structure 170, the first through hole 150 has two openings, one of which is adjacent to the first wall 111 and the other is adjacent to the electrode assembly 120. The first portion 161 of the insulating sheet 160 can be attached to the opening of the first through hole 150 adjacent to the first wall 111 or to the opening of the first through hole 150 adjacent to the electrode assembly 120.

[0149] In this setting, the first part 161 is fixed to the isolation structure 170 by gluing and covers the first through hole 150. The gluing method facilitates the fixation of the first part 161 and can make the connection between the first part 161 and the isolation structure 170 tighter and the shielding effect better.

[0150] The first portion 161 may have an adhesive layer. For example, the insulating sheet 160 may be an insulating tape with one side being a non-adhesive surface and the other side being an adhesive surface. The adhesive surface of the insulating sheet 160 is adhered to the isolation structure 170, and the first portion 161 of the insulating sheet 160 covers the first through-hole 150. Alternatively, the first portion 161 may not have an adhesive layer, but may be adhered to the isolation structure 170 via adhesive.

[0151] The insulating sheet 160 can be located on a side of the isolation structure 170 that is away from the first wall 111 and closer to the electrode assembly 120, or it can be located on a side of the isolation structure 170 that faces the first wall 111 and away from the electrode assembly 120. In some examples, the first portion 161 is located on the side of the isolation structure 170 that faces the first wall 111. In this arrangement, during assembly, the electrode assembly 120 and the isolation structure 170 can be connected first, and then the first portion 161 can be covered on the isolation structure 170. The first portion 161 is arranged on the side of the isolation structure 170 that faces the first wall 111, which facilitates the connection operation between the first portion 161 and the isolation structure 170 after the isolation structure 170 and the electrode assembly 120 are connected. Because the first portion 161 is arranged on the side of the isolation structure 170 that faces the first wall 111, there is more room for operation when fixing the first portion 161 to the isolation structure 170, making the operation easier.

[0152] In one possible design, as shown in Figures 4, 9, 12 and 15, the isolation structure 170 includes a baffle 140 and an insulating film 130, the baffle 140 is located between the electrode assembly 120 and the first wall 111, at least a portion of the insulating film 130 is located between the electrode assembly 120 and the first wall 111, the first through hole 150 includes a first hole segment 151 and a second hole segment 152 that are oppositely arranged and connected, the first hole segment 151 is arranged on the insulating film 130, and the second hole segment 152 is arranged on the baffle 140, and the first part 161 covers the opening on the side of the first hole segment 151 away from the second hole segment 152 or the opening on the side of the second hole segment 152 away from the first hole segment 151.

[0153] The insulating film 130 is coated on 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. The baffle 140 is located between the electrode assembly 120 and the first wall 111. The baffle 140 can be disposed between the insulating film 130 and the electrode assembly 120, or between the insulating film 130 and the first wall 111.

[0154] First through hole 150 includes a first hole segment 151 and a second hole segment 152. First hole segment 151 and second hole segment 152 are disposed opposite each other and communicate with each other. First hole segment 151 is disposed on insulating film 130 and extends through insulating film 130. Second hole segment 152 is disposed on baffle plate 140 and extends through baffle plate 140. The cross-sectional shape of first hole segment 151 can be the same as or different from the cross-sectional shape of second hole segment 152. First hole segment 151 and second hole segment 152 can each be a circular hole, an elliptical hole, a racetrack hole, a polygonal hole, or the like. The cross-sectional shape of first hole segment 151 and second hole segment 152 are both the shapes of a cross section parallel to first wall 111.

[0155] In this setting method, since a first hole segment 151 is provided on the insulating film 130 and a second hole segment 152 is provided on the baffle plate 140, the insulating film 130 and the baffle plate 140 can be positioned by the first hole segment 151 and the second hole segment 152. During the positioning of the insulating film 130 and the baffle plate 140, the positioning structure is first passed through the first hole segment 151 and then extended into the second hole segment 152, or the positioning structure is first passed through the second hole segment 152 and then extended into the first hole segment 151. The relative limitation between the positioning structure and the insulating film 130 is achieved through the cooperation between the positioning structure and the first hole segment 151, and the relative positioning between the positioning structure and the baffle plate 140 is achieved through the cooperation between the positioning structure and the second hole segment 152. Since the same positioning structure is sequentially passed through the first hole segment 151 and the second hole segment 152, the insulating film 130 and the baffle plate 140 are relatively positioned through the positioning structure. First portion 161 covers the side of first hole segment 151 away from second hole segment 152, or covers the side of second hole segment 152 away from first hole segment 151. Since first hole segment 151 is connected to second hole segment 152, covering either first hole segment 151 or second hole segment 152 can block the connection of first through-hole 150 through first portion 161. Since first through-hole 150 is used to position and install insulating film 130 and baffle 140, it is no longer necessary to use first through-hole 150 after insulating film 130 and baffle 140 are connected. Therefore, first portion 161 is connected after insulating film 130 and baffle 140 are connected, and first portion 161 covers first hole segment 151 or second hole segment 152, thereby covering first through-hole 150.

[0156] In one possible configuration, as shown in Figures 3, 4, and 6, the insulating film 130 includes a first film layer 131 and a second film layer 132. The first film layer 131 is located between the electrode assembly 120 and the first wall 111, and the second film layer 132 is coated on at least a portion of the circumferential side of the electrode assembly 120. The first film layer 131 and the second film layer 132 can be independent structures and then connected together, or they can be an integral structure. When the first film layer 131 and the second film layer 132 are independent structures, the second film layer 132 can be an integral structure or a split structure. When the second film layer 132 is a split structure, the second film layer 132 includes multiple sub-film layers, and different sub-film layers are respectively coated on the outside of different sides of the electrode assembly 120, and the edges of adjacent sub-film layers are connected.

[0157] Exemplarily, the insulating film 130 is a whole film layer, that is, the first film layer 131 and the second film layer 132 are an integrated structure, which is wrapped around multiple sides of the electrode assembly 120 after folding. The part located between the electrode assembly 120 and the first wall 111 is the first film layer 131, and the part surrounding the outer side of the electrode assembly 120 is the second film layer 132.

[0158] As shown in FIG. 12 to FIG. 17 , in one possible design, the insulating sheet 160 includes only the first portion 161 .

[0159] Alternatively, in another possible design, the insulating film 130 is folded and wrapped around the electrode assembly 120, and forms a first fold edge 132a and a second fold edge 132b that overlap or connect with each other on the side of the electrode assembly 120. The insulating sheet 160 includes a second part 162, which fixes the first fold edge 132a and the second fold edge 132b, and the first part 161 is connected to the second part 162.

[0160] For example, as shown in FIG6 , the dotted line in FIG6 is the folding mark. The insulating film 130 is a whole film layer, and the second film layer 132 is divided into two parts, namely the first sub-film layer and the second sub-film layer. The first sub-film layer and the second sub-film layer are respectively located on opposite sides of the first film layer 131. In the X direction, the first sub-film layer is provided with a first folding edge 132a on both sides, and the second sub-film layer is provided with a second folding edge 132b on both sides. The first folding edge 132a and the second folding edge 132b are provided in a one-to-one correspondence. After folding, one of the first folding edges 132a and one of the second folding edges 132b partially overlap, and the second part 162 fixes the first folding edge 132a and the second folding edge 132b. Another first folding edge 132a and another second folding edge 132b partially overlap, and the second part 162 fixes the first folding edge 132a and the second folding edge 132b.

[0161] In this arrangement, insulating sheet 160 not only covers first through hole 150 but also secures first folded edge 132a and second folded edge 132b. Since insulating sheet 160 includes connected first portion 161 and second portion 162, the contact area between insulating sheet 160 and isolation structure 170 is increased, thereby improving the connection stability between insulating sheet 160 and isolation structure 170.

[0162] When there are multiple first folded edges 132a and multiple second folded edges 132b, the number of insulating sheets 160 can be one or more. When there is one insulating sheet 160, there is one first portion 161, and the number of second portions 162 is the same as the number of first folded edges 132a. Each second portion 162 is connected to the same first portion 161. For example, there are two first folded edges 132a and two second folded edges 132b. As shown in Figures 9 and 10, there is one insulating sheet 160, one first portion 161, and two second portions 162. The two second portions 162 are respectively used to fix a corresponding set of first folded edges 132a and second folded edges 132b.

[0163] When there are multiple insulating sheets 160 and the number is less than the number of first folded edges 132a, one insulating sheet 160 includes one first portion 161 and several second portions 162. The number of second portions 162 is less than the number of first folded edges 132a, and the number of second portions 162 in multiple insulating sheets 160 is equal to the number of first folded edges 132a. The number of second folded edges 132b in different insulating sheets 160 can be the same or different. For example, if there are four first folded edges 132a, then there are four second folded edges 132b. If there are two insulating sheets 160, one insulating sheet 160 can include one first portion 161 and three second portions 162, the other insulating sheet 160 can include one first portion 161 and one second portion 162, or both insulating sheets 160 can include one first portion 161 and two second portions 162.

[0164] When the number of insulating sheets 160 is the same as the number of first folded edges 132a, the insulating sheet 160 includes a first part 161 and a second part 162. For example, as shown in Figures 4 and 5, the number of first folded edges 132a is two, and the number of insulating sheets 160 is two. Each insulating sheet 160 includes a first part 161 and a second part 162, wherein one second part 162 fixes one of the first folded edges 132a and one of the second folded edges 132b, and the other second part 162 fixes the other first folded edge 132a and the other second folded edge 132b.

[0165] The second portion 162 can be attached to the insulating film 130 to secure the first hem 132a and the second hem 132b. In other words, the second portion 162 is connected to the first hem 132a and the second hem 132b by adhesive. The first hem 132a and the second hem 132b partially overlap, and the second portion 162 is partially attached to the first hem 132a and partially to the second hem 132b, thereby securing the first hem 132a and the second hem 132b. The partial overlap between the first hem 132a and the second hem 132b improves the covering effect of the first hem 132a and the second hem 132b on the electrode assembly 120.

[0166] In one possible design, in a first direction, second portion 162 is spaced apart from at least one of two edges of isolation structure 170 spaced apart in the first direction. The first direction is parallel to the width of first wall 111. The first direction is the Y direction. Second portion 162 is spaced apart from at least one edge of isolation structure 170. In the first direction, a side surface of isolation structure 170 has two opposing edges. Second portion 162 may be spaced apart from one of the edges, or may be spaced apart from both edges of isolation structure 170.

[0167] In this arrangement, since the second part 162 is spaced apart from at least one edge of the isolation structure 170, that is, in the first direction, the size of the second part 162 is smaller than the size of the isolation structure 170, it is convenient to flatly attach the second part 162 to the insulating film 130, thereby reducing the space occupied by the second part 162.

[0168] In one possible design, in the first direction, the distance between the second portion 162 and the two side edges of the isolation structure 170 is equal. That is to say, in one side of the isolation structure 170, the second portion 162 is centrally arranged. When the seam between the first folded edge 132a and the second folded edge 132b is located in the non-edge area of ​​the electrode assembly 120, the second portion 162 can play a good fixing role for both the first folded edge 132a and the second folded edge 132b. In this arrangement, the second portion 162 is adhered to the middle area of ​​the insulating film 130, which is convenient for fixing the first folded edge 132a and the second folded edge 132b. At the same time, since the second portion 162 is arranged in the middle area of ​​one side of the isolation structure 170, the two side edges of the second portion 162 are both attached to the side of the isolation structure 170, which is convenient for improving the flatness of the second portion 162.

[0169] In some embodiments, the first portion 161 and the second portion 162 are of equal width, that is, in the first direction, the dimensions of the first portion 161 are equal to the dimensions of the second portion 162. Exemplarily, the insulating sheet 160 is a rectangular strip structure. After being attached to one side of the isolation structure 170 with the first and second folded edges 132a, 132b, it is bent and attached to the side of the isolation structure 170 facing the first wall 111, covering the first through-hole 150. The portion attached to the first and second folded edges 132a, 132b is the second portion 162, and the portion attached to the isolation structure 170 facing the first wall 111 is the first portion 161.

[0170] In some embodiments, as shown in Figures 7 and 8, in the first direction, the width of the housing 110 is W1, and the width of the second portion 162 is W2, where 0.1 ≤ W2 / W1 ≤ 0.9. The width of the housing 110 is the size of the housing 110 in the first direction, and the width of the second portion 162 is the size of the second portion 162 in the first direction. In other words, the width of the second portion 162 is at least 0.1 times the width of the housing 110, and at most 0.9 times the width of the housing 110. As can be seen from the above, the width of the second portion 162 is adjustable depending on the width of the housing 110. In this configuration, the width of the second portion 162 can be set based on the width of the housing 110. Since the width of the second portion 162 is 0.1 times or greater than the width of the housing 110, the width of the second portion 162 is sufficient to secure the first hem 132a and the second hem 132b. Because the width of second portion 162 is 0.9 times or less the width of housing 110, second portion 162 can be completely flat on the side of isolation structure 170, resulting in high flatness and a small footprint. For example, the width of second portion 162 can be 0.1 times, 0.2 times, 0.3 times, 0.4 times, 0.5 times, 0.6 times, 0.7 times, 0.8 times, 0.9 times, etc., of the width of housing 110. For example, when the width of housing 110 is 100 mm, the width of second portion 162 ranges from 10 mm to 90 mm, such as 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.

[0171] 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 housing 110, which can increase the contact area with the first fold 132a and the second fold 132b, thereby improving the fixing effect of the first fold 132a and the second fold 132b; the width of the second portion 162 is at most 0.75 times the width of the housing 110, so that the width of the second portion 162 is small while still meeting the requirements for fixing the first fold 132a and the second fold 132b. For example, the width of the second portion 162 can be 0.1 times, 0.2 times, 0.3 times, 0.4 times, 0.5 times, 0.6 times, 0.7 times, 0.8 times, 0.9 times, etc., of the width of the housing 110. Illustratively, when the width of the housing 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.

[0172] In some embodiments, as shown in FIG8 , the second portion 162 has a dimension of 10 mm to 80 mm along the height direction of the electrode assembly 120. That is, in the Z direction, the second portion 162 has a dimension of 10 mm to 80 mm. For example, 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 configuration, the height of the second portion 162 may be sufficient to secure the first hem 132 a and the second hem 132 b.

[0173] In some embodiments, along the height direction of the electrode assembly 120, the size of the second portion 162 is 15mm-50mm. That is to say, in the Z direction, the size of the second portion 162 is 15mm-50mm. For example, the second portion 162 may be 15mm, 17mm, 22mm, 27mm, 32mm, 38mm, 42mm, 48mm or 50mm, etc. In this arrangement, the contact area between the second portion 162 and the first folding edge 132a and the second folding edge 132b is relatively larger, and the fixing effect of the first folding edge 132a and the second folding edge 132b is relatively better. At the same time, on the basis of satisfying the fixing of the first folding edge 132a and the second folding edge 132b, the second portion 162 occupies a relatively small space on the side of the isolation structure 170.

[0174] In some embodiments, the isolation structure 170 includes a baffle plate 140 and an insulating film 130. The baffle plate 140 is located between the electrode assembly 120 and the first wall 111. At least a portion of the insulating film 130 is located between the electrode assembly 120 and the first wall 111. The first through-hole 150 includes a first hole segment 151 and a second hole segment 152 that are oppositely disposed and connected. The first hole segment 151 is disposed in the insulating film 130, and the second hole segment 152 is disposed in the baffle plate 140. For example, if there are two first through-holes 150, then there are two first hole segments 151 and two second hole segments 152. The two first hole segments are disposed opposite and connected to the two second hole segments one-to-one. The first portion 161 covers the opening on the side of the first hole segment 151 away from the second hole segment 152 or the opening on the side of the second hole segment 152 away from the first hole segment 151.

[0175] In one specific embodiment, the baffle plate 140 is provided with only two holes, both of which are first hole segments 151; the insulating film 130 is provided with only two holes, both of which are second hole segments 152. In other words, the baffle plate 140 has only two holes, both of which are first hole segments 151. Besides the first hole segments 151, no other holes penetrate the baffle plate 140. The insulating film 130 has only two holes, both of which are second hole segments 152. Besides the second hole segments 152, no other holes penetrate the insulating film 130. The first hole segments 151 and the second hole segments 152 can be used to position the baffle plate 140 and the insulating film 130. The two first hole segments 151 and the two second hole segments 152 provide good positioning accuracy. After the baffle plate 140 and the insulating film 130 are positioned, at least one of the first hole segment 151 and the second hole segment 152 is covered by the first part 161, that is, the first through hole 150 formed by the first hole segment 151 and the second hole segment 152 is covered, and the first part 161 covers all the holes on the baffle plate 140 and the insulating film 130, so that the baffle plate and the insulating sheet have a better blocking effect on the powder on one side of the electrode assembly.

[0176] As shown in Figures 18 and 19, in a possible design, the isolation structure 170 also includes a support block 180, the baffle plate 140 is arranged between the insulating film 130 and the first wall 111, and the support block 180 is arranged on the side of the baffle plate 140 facing the first wall 111; in one setting, the support block 180 is arranged in an area of ​​the baffle plate 140 where the first through hole 150 is not provided; in another setting, the support block 180 is provided with a second through hole 181, and the second through hole 181 of at least one support block 180 is arranged opposite to the first through hole 150, and the first part 161 covers the second through hole 181.

[0177] There may be one or more support blocks 180. When there is only one support block 180, the support block 180 may be disposed in an area of ​​the baffle plate 140 where the first through hole 150 is disposed, or in an area of ​​the baffle plate 140 where the first through hole 150 is not disposed. When the support block 180 is disposed in an area of ​​the baffle plate 140 where the first through hole 150 is disposed, the support block 180 is provided with a second through hole 181 that communicates with the first through hole 150. When the support block 180 is disposed in an area of ​​the baffle plate 140 where the first through hole 150 is not disposed, the support block 180 may or may not be provided with the second through hole 181. When there are multiple support blocks 180, all support blocks 180 may be disposed in the region of the baffle plate 140 where the first through-holes 150 are disposed, or may be disposed in the region of the baffle plate 140 where the first through-holes 150 are not disposed. Furthermore, some support blocks 180 may be disposed in the region of the baffle plate 140 where the first through-holes 150 are disposed, while other support blocks 180 may be disposed in the region of the baffle plate 140 where the first through-holes 150 are not disposed. When all support blocks 180 are disposed in the region where the first through-holes 150 are disposed, all support blocks 180 are provided with second through-holes 181, and the second through-holes 181 are in one-to-one communication with the first through-holes 150, with the first portion 161 covering all second through-holes 181. When only a portion of the support blocks 180 are disposed in the area of ​​the baffle plate 140 where the first through holes 150 are disposed, the support blocks 180 covering the first through holes 150 are provided with second through holes 181 to communicate with the first through holes 150 via the second through holes 181. Other support blocks 180 not disposed at the locations of the first through holes 150 may or may not be provided with the second through holes 181. When all support blocks 180 are disposed in the area of ​​the baffle plate 140 where the first through holes 150 are not disposed, the support blocks 180 may or may not be provided with the second through holes 181.

[0178] In one feasible arrangement, two first through holes 150 are spaced apart on the baffle plate 140, and four support blocks 180 are provided. Of the four support blocks 180, two support blocks 180 are respectively provided at the two first through holes 150, and two support blocks 180 are provided in an area where no first through holes 150 are provided. All four support blocks 180 are provided with second through holes 181. The second through holes 181 on the support blocks 180 that are provided opposite the first through holes 150 are opposite and communicate with the corresponding first through holes 150. Because all four support blocks 180 are provided with second through holes 181, the four support blocks 180 can employ the same structure, facilitating manufacturing.

[0179] Since the support block 180 is provided on the isolation structure 170, the support block 180 can improve the structural strength of the isolation structure 170. When the support block 180 is provided in an area where the first through-hole 150 is not provided, the first portion 161 can simply cover the first through-hole 150. When the support block 180 is provided in an area opposite the first through-hole 150, since the support block 180 is provided with the second through-hole 181, which is opposite the first through-hole 150, the first portion 161 can cover the first through-hole 150 by covering the second through-hole 181, thereby reducing the probability of powder on one side of the electrode assembly 120 moving to the side of the first wall 111 via the first through-hole 150.

[0180] In some examples, the support block 180 and the baffle plate 140 may be connected by heat fusion, and the baffle plate 140 and the insulating film 130 may be connected by heat fusion.

[0181] As shown in Figures 18 and 19, in some examples, two first through holes 150 are provided in the baffle plate 140. The centerline of the baffle plate 140 along the width direction is P1. Both first through holes 150 are located in an area close to a side edge of the baffle plate 140 in the width direction, that is, both first through holes 150 are located on the same side of P1. There are four support blocks 180, two of which are provided with second through holes 181. Both support blocks 180 are located opposite the first through holes 150, and the second through holes 181 in the support blocks 180 are connected to the first through holes 150. The other two support blocks 180 are not provided with second through holes 181, and are located in areas where the first through holes 150 are not provided. There are two insulating sheets 160. The first portion 161 of one insulating sheet 160 is attached to the surface of the two support blocks 180 located on one side of the baffle plate 140 along the length direction, away from the baffle plate 140. The first portion 161 covers the second through-hole 181 of one of the support blocks 180. The first portion 161 of the other insulating sheet 160 is attached to the surface of the two support blocks 180 located on the other side of the baffle plate 140 along the length direction, away from the baffle plate 140. The first portion 161 covers the second through-hole 181 of one of the support blocks 180.

[0182] As shown in Figures 20 and 21 , in some examples, two first through-holes 150 are provided on the baffle plate 140. The centerline of the baffle plate 140 along the width direction is designated as P1. Both first through-holes 150 are located in an area adjacent to a side edge of the baffle plate 140 in the width direction, that is, both first through-holes 150 are located on the same side of P1. There are four support blocks 180, two of which are provided with second through-holes 181. Both support blocks 180 are located opposite the first through-holes 150, and the second through-holes 181 on the support blocks 180 are connected to the first through-holes 150. The other two support blocks 180 are not provided with second through-holes 181, and are located in areas where the first through-holes 150 are not provided. There are two insulating sheets 160. The first portion 161 of one insulating sheet 160 is attached to a surface of the support block 180 with the second through hole 181 on one side of the baffle plate 140 along the length direction, away from the baffle plate 140. The first portion 161 covers the second through hole 181. The first portion 161 of the other insulating sheet 160 is attached to a surface of the support block 180 with the second through hole 181 on the other side of the baffle plate 140 along the length direction, away from the baffle plate 140. The first portion 161 covers the second through hole 181.

[0183] As shown in Figures 22 and 23, in some examples, two first through holes 150 are provided in the baffle plate 140. The centerline of the baffle plate 140 along the width direction is P1. Both first through holes 150 are located in an area close to a side edge of the baffle plate 140 in the width direction, that is, both first through holes 150 are located on the same side of P1. There are four support blocks 180, two of which are provided with second through holes 181. Both support blocks 180 are located opposite the first through holes 150, and the second through holes 181 in the support blocks 180 are connected to the first through holes 150. The other two support blocks 180 are not provided with second through holes 181, and are located in areas where the first through holes 150 are not provided. There is one insulating sheet 160 . The first portion 161 of the insulating sheet 160 is adhered to two supporting blocks 180 with second through holes 181 on both sides along the X direction, and the first portion 161 of the insulating sheet 160 covers the two second through holes 181 .

[0184] As shown in Figures 24 and 25, in some examples, two first through holes 150 are provided on the baffle plate 140. The center line of the baffle plate 140 along the width direction is P1, and the centers of the two first through holes 150 are both located on P1. In other words, the two first through holes 150 are centered in the width direction of the baffle plate 140. There are four support blocks 180, none of which are provided with second through holes 181. All four support blocks 180 are located in areas where no first through holes 150 are provided. In other words, the first through holes 150 are not blocked by any support block 180. There is one insulating sheet 160, and the first portion 161 of the insulating sheet 160 is attached to the baffle plate 140. The first portion 161 of the insulating sheet 160 covers the two second through holes 181 on both sides along the X direction.

[0185] As shown in Figures 26 and 27, in some examples, two first through holes 150 are provided on the baffle plate 140. The center line of the baffle plate 140 along the width direction is P1, and the center points of the two first through holes 150 are both located on P1. In other words, the two first through holes 150 are centered in the width direction of the baffle plate 140. There are four support blocks 180, none of which are provided with second through holes 181. All four support blocks 180 are located in areas where no first through holes 150 are provided. In other words, the first through holes 150 are not blocked by any support block 180. There are two insulating sheets 160, which are spaced apart and attached to the baffle structure. The first portions 161 of the two insulating sheets 160 respectively cover the two first through holes 150.

[0186] As shown in Figures 18, 24, and 26, in one configuration, a third through hole 1411 is provided on the baffle plate 140. The third through hole 1411 penetrates the baffle plate 140 along the Z direction. The third through hole 1411 can connect two opposing surfaces of the baffle plate 140 in the Z direction, thereby allowing airflow on both sides of the baffle plate 140 in the Z direction to flow mutually, thereby increasing the airflow path within the battery cell and improving the airflow performance within the battery cell. Furthermore, providing the third through hole 1411 on the baffle plate 140 can also reduce the weight of the baffle plate 140, thereby making the battery cell lighter.

[0187] In one setting, there are multiple third through holes 1411 on the partition plate 140, and the multiple third through holes 1411 are all arranged in the central area of ​​the partition plate 140. The multiple third through holes 1411 can be distributed in an array on the partition plate 140, and in the X direction, the first through hole 150 is arranged on both sides of the array area formed by the multiple third through holes 1411.

[0188] The cross-sectional dimensions of each third through hole 1411 are smaller than the cross-sectional dimensions of the first through hole 150. When the first through hole 150 includes a first hole segment 151 and a second hole segment 152, the cross-sectional dimensions of the first hole segment 151 and the second hole segment 152 may be equal or unequal. If the cross-sectional dimensions of the first hole segment 151 and the second hole segment 152 are unequal, the cross-sectional dimensions of the third through hole 1411 are smaller than the cross-sectional dimension of the smaller of the first hole segment 151 and the second hole segment 152. In other words, the third through hole 1411 is smaller than the first through hole 150.

[0189] Based on the above-mentioned battery cell 100, this embodiment further provides an example of a battery 10. The battery 10 includes the battery cell 100 provided in any of the above-mentioned embodiments.

[0190] The battery 10 may be a battery 10 module. When there are multiple battery cells 100 , the multiple battery cells 100 are arranged and fixed to form a battery 10 module.

[0191] The battery 10 may also be a battery 10 pack, which includes a housing 200 and battery cells 100, with the battery cells 100 or battery 10 modules contained within the housing 200. The housing 200 is used to provide a storage space for the battery cells 100 or battery 10 modules. The housing 200 may be independent of other structures of the electrical device 1, or the housing 200 may be part of other structures in the electrical device 1. For example, when the electrical device 1 is a vehicle, the housing 200 may be part of the vehicle's chassis. For example, a portion of the housing 200 may form at least a portion of the vehicle's floor, or a portion of the housing 200 may form at least a portion of the vehicle's crossbeam or longitudinal beam.

[0192] In the battery pack 10, there may be multiple battery cells 100, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the battery pack 100. Multiple battery cells 100 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery pack 100 is housed within the housing 200. Alternatively, the battery pack 10 may be constructed by first connecting multiple battery cells 100 in series, in parallel, or in a hybrid configuration to form a battery module 10, and then connecting multiple battery modules 10 in series, in parallel, or in a hybrid configuration to form a complete battery pack 10, which is then housed within the housing 200.

[0193] The battery 10 may further include other structures. For example, the battery 10 may further include a busbar component for achieving electrical connection between the plurality of battery cells 100 .

[0194] It is understandable that, in this example, the battery 10 including the battery cell 100 is mainly described, and the battery 10 may also include other functional components, which will not be described in detail here.

[0195] Since the battery 10 includes the battery cell 100 provided in the above embodiment, the battery 10 at least includes all the technical effects of the above battery cell 100 , which will not be described in detail here.

[0196] This embodiment provides an electrical device 1, which includes the battery 10 in the above embodiment, and the battery 10 is used to provide electrical energy.

[0197] Since the electrical device 1 includes the battery 10 , it has at least all the beneficial effects of the battery 10 , which will not be described in detail here.

[0198] The electric device 1 may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0199] For the convenience of explanation, the following embodiments are described by taking an electrical device 1 of one embodiment of the present application as an example of a vehicle. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 10 is provided inside the vehicle, and the battery 10 can be provided at the bottom, head or tail of the vehicle. The battery 10 can be used to power the vehicle, for example, the battery 10 can be used as an operating power source for the vehicle. The vehicle may also include a controller and a motor, and the controller is used to control the battery 10 to power the motor, for example, for starting, navigating and operating power requirements of the vehicle during driving.

[0200] In some embodiments of the present application, the battery 10 can serve not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0201] As shown in Figures 3 to 8, in a specific implementation of this embodiment, a battery cell 100 is provided, which includes a shell 110, an electrode assembly 120, an isolation structure 170, and an insulating sheet 160. The shell 110 has an inner cavity, and the shell 110 has a first wall 111. The first wall 111 is specifically the bottom wall of the shell 110, and the first wall 111 is parallel to the X direction and the Y direction. The electrode assembly 120 and the isolation structure 170 are both installed in the inner cavity. At least a portion of the isolation structure 170 is located between the first wall 111 and the electrode assembly 120. The isolation structure 170 is provided with a first through hole 150. The first through hole 150 is provided in the region of the isolation structure 170 between the first wall 111 and the electrode assembly 120. The first through hole 150 is provided along the Z direction through the isolation structure 170. The isolation structure 170 includes a baffle 140 and an insulating film 130. The insulating film 130 is coated on 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 and a second film layer 132. The first film layer 131 is located between the electrode assembly 120 and the first wall 111, and the second film layer 132 is coated on at least a portion of the circumferential side of the electrode assembly 120. The first film layer 131 and the second film layer 132 form an integral structure. Specifically, the insulating film 130 is a single sheet, and the second film layer 132 is divided into two parts, referred to as a first sub-film layer and a 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. In the X direction, a first fold 132a is provided on both sides of the first sub-film layer, and a second fold 132b is provided on both sides of the second sub-film layer. The first fold 132a and the second fold 132b are provided in a one-to-one correspondence. After folding, one of the first folds 132a and one of the second folds 132b partially overlap, and another first fold 132a and another second fold 132b partially overlap. The number of insulating sheets 160 is the same as the number of first folds 132a. In this embodiment, there are two first folds 132a and two insulating sheets 160. Each insulating sheet 160 includes a first portion 161 and a second portion 162. In the Y direction, the first portion 161 and the second portion 162 are of equal size. One of the second parts 162 fixes one of the first folded edge 132a and the second folded edge 132b, and the other second part 162 fixes the other first folded edge 132a and the other second folded edge 132b.In the Y-axis direction, the distance between the second portion 162 and the two side edges of the isolation structure 170 is equal. The second portion 162 is connected to the first fold 132a and the second fold 132b by gluing. In this way, when the seam between the first fold 132a and the second fold 132b is located in the non-edge area of ​​the electrode assembly 120, the second portion 162 can effectively fix the first fold 132a and the second fold 132b. The barrier 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 through-hole 150 includes a first hole segment 151 and a second hole segment 152. The first hole segment 151 and the second hole segment 152 are arranged opposite each other and communicate with each other. The first hole segment 151 is arranged on the first film layer 131 of the insulating film 130 and penetrates the first film layer 131 of the insulating film 130. The second hole segment 152 is arranged on the baffle plate 140 and penetrates the baffle plate 140. The number of first through-holes 150 is equal to the number of insulating sheets 160. In this embodiment, there are two insulating sheets 160, and the number of first through-holes 150 is also two. The first portion 161 of the first insulating sheet 160 covers one first through-hole 150, and the first portion 161 of the other insulating sheet 160 covers the other first through-hole 150. Specifically, the first portion 161 covers the side of the second hole section 152 of the corresponding first through hole 150 away from the first hole section 151, that is, the first portion 161 is adhered to the side of the baffle 140 facing the first wall 111 and covers the corresponding first hole section 151.

[0202] As shown in Figures 18 and 19, in another specific embodiment of this embodiment, a battery cell 100 is provided. The battery cell 100 includes a housing 110, an electrode assembly 120, an isolation structure 170, and an insulating sheet 160. The housing 110 has an inner cavity and a first wall 111, specifically the bottom wall of the housing 110. The first wall 111 is parallel to the X and Y directions. The electrode assembly 120 and the isolation structure 170 are both mounted in the inner cavity. At least a portion of the isolation structure 170 is located between the first wall 111 and the electrode assembly 120. The isolation structure 170 is provided with a first through-hole 150. The first through-hole 150 is located in the region of the isolation structure 170 between the first wall 111 and the electrode assembly 120. The first through-hole 150 extends through the isolation structure 170 along the Z direction. The isolation structure 170 includes a baffle 140, an insulating film 130, and a support block 180. The insulating film 130 is coated on 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 and a second film layer 132. The first film layer 131 is located between the electrode assembly 120 and the first wall 111, and the second film layer 132 is coated on at least a portion of the circumferential side of the electrode assembly 120. The first film layer 131 and the second film layer 132 form an integral structure. Specifically, the insulating film 130 is a single sheet, and the second film layer 132 is divided into two parts, referred to as a first sub-film layer and a 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. In the X direction, a first fold 132a is provided on both sides of the first sub-film layer, and a second fold 132b is provided on both sides of the second sub-film layer. The first fold 132a and the second fold 132b are provided in a one-to-one correspondence. After folding, one of the first folds 132a and one of the second folds 132b partially overlap, and another first fold 132a and another second fold 132b partially overlap. The number of insulating sheets 160 is the same as the number of first folds 132a. In this embodiment, there are two first folds 132a and two insulating sheets 160. Each insulating sheet 160 includes a first portion 161 and a second portion 162. In the Y direction, the first portion 161 and the second portion 162 are of equal size. One of the second portions 162 secures one of the first folded edges 132a and the second folded edge 132b, while the other second portion 162 secures the other first folded edge 132a and the other second folded edge 132b. The barrier 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 support block 180 is disposed on the side of the barrier plate 140 facing the first wall 111.The support block 180 is provided with a second through hole 181. The second through hole 181 of at least one support block 181 is arranged opposite the first through hole 150, and the first portion 161 covers the second through hole 181. The first through hole 150 includes a first hole segment 151 and a second hole segment 152. The first hole segment 151 and the second hole segment 152 are arranged opposite each other and communicate with each other. The first hole segment 151 is provided on the first film layer 131 of the insulating film 130 and penetrates the first film layer 131 of the insulating film 130. The second hole segment 152 is provided on the baffle plate 140 and penetrates the baffle plate 140. The first hole segment 151 and the second hole segment 152 are arranged in a one-to-one correspondence, and the second through hole 181 is provided in a one-to-one correspondence with the second hole segment 152 of the corresponding first through hole 150. Specifically, the baffle plate 140 is provided with two second hole sections 152 of the first through-holes 150. The centerline of the baffle plate 140 along the width direction is P1. Both second hole sections 152 are located in an area near one side of the baffle plate 140 in the width direction. In other words, the two first through-holes 150 are located on the same side of P1. There are four support blocks 180, two of which are provided with second through-holes 181. Both support blocks 180 are located opposite the first through-holes 150, and the second through-holes 181 in each support block 180 communicate with the first through-holes 150. The other two support blocks 180 are not provided with second through-holes 181 and are located in an area where the first through-holes 150 are not provided. There are two insulating sheets 160. The first portion 161 of one insulating sheet 160 is attached to the surface of the two support blocks 180 located on one side of the baffle plate 140 along the length direction, away from the baffle plate 140. The first portion 161 covers the second through-hole 181 in one of the support blocks 180. The first portion 161 of the other insulating sheet 160 is attached to the surface of the two support blocks 180 located on the other side of the baffle plate 140 along the length direction, away from the baffle plate 140. The first portion 161 covers the second through-hole 181 in one of the support blocks 180. In this embodiment, a plurality of third through-holes 1411 are provided through the baffle plate 140 along the Z-axis. The plurality of third through-holes 1411 are spaced apart and distributed between the two first through-holes 150.

[0203] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: a housing having an inner cavity, the housing having a first wall; An electrode assembly, disposed in the inner cavity; an isolation structure, wherein the isolation structure is at least partially disposed between the first wall and the electrode assembly, and a first through hole is disposed at a portion of the isolation structure located between the first wall and the electrode assembly; and The insulating sheet includes a first portion, wherein the first portion covers the first through hole.

2. The battery cell according to claim 1, characterized in that: The isolation structure is provided with a plurality of the first through holes, and the insulating sheet covers all the first through holes.

3. The battery cell according to claim 2, characterized in that: The number of the insulating sheets is equal to the number of the first through holes, the insulating sheets are arranged in a one-to-one correspondence with the first through holes, and the insulating sheets cover the corresponding first through holes; or, the number of the insulating sheets is one, and one insulating sheet covers all the first through holes.

4. The battery cell according to claim 1, characterized in that: The first part is adhered to the opening of the first through hole.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The first portion is located on a side of the isolation structure facing the first wall.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The isolation structure includes a baffle plate and an insulating film, the baffle plate is located between the electrode assembly and the first wall, at least a portion of the insulating film is located between the electrode assembly and the first wall, the first through hole includes a first hole segment and a second hole segment that are oppositely arranged and connected, the first hole segment is arranged on the insulating film, the second hole segment is arranged on the baffle plate, and the first portion covers an opening on one side of the first hole segment away from the second hole segment or an opening on one side of the second hole segment away from the first hole segment.

7. The battery cell according to claim 6, characterized in that: The insulating film is folded and wrapped around the electrode assembly, and forms a first folded edge and a second folded edge that overlap each other on the side of the electrode assembly. The insulating sheet includes a second part, the second part fixes the first folded edge and the second folded edge, and the first part is connected to the second part.

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

9. The battery cell according to claim 8, characterized in that: In the first direction, the distances between the second portion and two side edges of the isolation structure are equal.

10. The battery cell according to claim 9, characterized in that: In the first direction, the width of the shell is W1, the width of the second portion is W2, and 0.1≤W2 / W1≤0.

9.

11. The battery cell according to claim 10, characterized in that: 0.25≤W2 / W1≤0.

75.

12. The battery cell according to claim 7, characterized in that: Along the height direction of the electrode assembly, the size of the second portion is 10 mm-80 mm.

13. The battery cell according to claim 12, characterized in that: Along the height direction of the electrode assembly, the size of the second portion is 15 mm-50 mm.

14. The battery cell according to claim 6, characterized in that: There are only two holes on the baffle plate, and both of them are the first hole segments; there are only two holes on the insulating film, and both of them are the second hole segments, and the two first hole segments and the two second hole segments are arranged one by one opposite to each other.

15. The battery cell according to any one of claims 6 to 14, characterized in that: The isolation structure further includes a support block, the baffle plate is disposed between the insulating film and the first wall, and the support block is disposed on a side of the baffle plate facing the first wall; The support block is disposed on a region of the baffle plate where the first through hole is not disposed; or, The support block is provided with a second through hole, and at least one of the second through holes of the support block is arranged opposite to the first through hole, and the first part covers the second through hole.

16. A battery, characterized in that: Comprising a battery cell as claimed in any one of claims 1 to 15.

17. An electrical device, characterized in that: The electrical device comprises the battery as claimed in claim 16, and the battery is used to provide electrical energy.

Images