Battery cell, battery, and electric device

Abstract

Embodiments of the present application provide a battery monomer, a battery and an electric device. The battery monomer comprises a shell, an end cover, an electrode assembly, a first insulating piece and a second insulating piece. The shell has a first opening, and comprises two first side walls oppositely arranged along a first direction; the end cover closes the first opening; the electrode assembly is arranged in the shell; the first insulating piece is arranged between the end cover and the electrode assembly; and the second insulating piece wraps at least part of the electrode assembly and the first insulating piece, and is used for insulating and isolating the electrode assembly and the shell; wherein the first insulating piece is provided with a first air permeable channel, the electrode assembly comprises a first side surface facing the first side wall, and a first gap is formed between the second insulating piece and the first side surface along the first direction, and the first gap is in communication with the first air permeable channel. The technical solution of the present application can improve the reliability of the battery.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese patent application CN202311162065.1, filed on September 11, 2023, entitled “Battery Cell, Battery and Electrical Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery, and an electrical device. Background Technology

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0005] Battery reliability is a crucial factor in battery manufacturing. Therefore, improving battery reliability is a pressing technical challenge in battery technology. Summary of the Invention

[0006] This application provides a battery cell, a battery, and an electrical device that can improve battery reliability.

[0007] This application is achieved through the following technical solution:

[0008] In a first aspect, embodiments of this application provide a battery cell, which includes: a housing, an end cap, an electrode assembly, a first insulating member, and a second insulating member. The housing has a first opening and includes two first sidewalls disposed opposite each other along a first direction; the end cap closes the first opening; the electrode assembly is disposed within the housing; the first insulating member is disposed between the end cap and the electrode assembly; the second insulating member encloses at least a portion of the electrode assembly and the first insulating member, for insulating and isolating the electrode assembly and the housing; wherein the first insulating member is provided with a first venting channel, the electrode assembly includes a first side facing the first sidewall, and a first gap is formed between the second insulating member and the first side facing along the first direction, the first gap communicating with the first venting channel.

[0009] According to the embodiments of this application, in a battery cell, a second insulating member encloses an electrode assembly. Gas generated by the electrochemical reaction of the electrode assembly cannot penetrate the second insulating member. Since the first gap is connected to the first venting channel, when the battery cell is depressurized, the gas generated by the electrochemical reaction of the electrode assembly can flow through the first gap to the space between the electrode assembly and the first insulating member along the thickness direction of the first insulating member, and can also flow quickly through the first venting channel. The smooth gas flow reduces the obstruction of the gas flow by the first insulating member, so that the gas can flow to the depressurization mechanism in a timely manner for timely depressurization, thereby giving the battery cell high reliability.

[0010] According to some embodiments of this application, the first insulating member includes a first insulating body and a first protrusion. The first insulating body has a first surface facing the electrode assembly. The first protrusion protrudes from the first surface and is provided with a first venting channel that extends through the first protrusion along a first direction.

[0011] In the above scheme, the first protrusion is used to position the electrode assembly, and the first venting channel passes through the first protrusion, which can reduce the obstruction of the first protrusion to the gas.

[0012] According to some embodiments of this application, a second gap is formed between the second insulating member and the inner surface of the first sidewall along a first direction, and the second gap communicates with the first venting channel.

[0013] In the above scheme, a second gap is formed between the second insulating member and the inner surface of the first sidewall. The second gap is connected to the first venting channel so that the gas generated by the electrochemical reaction of the electrode assembly can move between the first sidewall and the second insulating member, thereby allowing the gas to flow toward the pressure relief mechanism in a timely manner.

[0014] According to some embodiments of this application, the second insulating member is connected to the first protrusion, and the second insulating member does not block the first ventilation channel.

[0015] In the above scheme, the second insulating element does not block the first ventilation channel, so as to facilitate the connection between the second gap and the first ventilation channel.

[0016] According to some embodiments of this application, the second insulating member is provided with a first through hole or a first notch that avoids the first ventilation channel.

[0017] In the above scheme, the first through hole or the first notch can avoid the first venting channel, the structure is simple and easy to process and manufacture, so as to realize the connection between the second gap and the first venting channel.

[0018] According to some embodiments of this application, the first gap and the second gap are connected through a first through hole or a first notch.

[0019] In the above scheme, the first gap and the second gap are connected through the first through hole or the first notch, so that the gas generated by the electrochemical reaction of the electrode assembly can flow through the first through hole or the first notch toward the first venting channel, so that the gas flows smoothly and flows toward the pressure relief mechanism in a timely manner.

[0020] According to some embodiments of this application, the second insulating member includes a first insulating portion and a second insulating portion. Along a first direction, the first insulating portion corresponds to a first side surface, and the second insulating portion corresponds to the first insulating member. The first insulating portion is provided with a second through hole, which connects a first gap and a second gap. The first through hole or a first notch is provided in the second insulating portion.

[0021] In the above scheme, the first gap and the second gap are connected by a second through hole, so that the gas in the first gap can flow towards the first venting channel through the second gap. The first through hole or the first notch located in the second insulating part, combined with the second through hole located in the first insulating part, facilitates the smooth flow of gas generated by the electrode assembly, so that it can flow towards the pressure relief mechanism.

[0022] According to some embodiments of this application, the housing further includes two second sidewalls disposed opposite to each other along a second direction, the second direction being perpendicular to the first direction, and the area of ​​the first sidewall being smaller than the area of ​​the second sidewall; the electrode assembly includes two first sidewalls and two second sidewalls, the two first sidewalls being disposed opposite to the first sidewall on the same side along a first direction, and the two second sidewalls being disposed opposite to the second sidewall on the same side along a second direction, and the area of ​​the first sidewall being smaller than the area of ​​the second sidewall.

[0023] In the above scheme, the area of ​​the first sidewall is smaller than the area of ​​the second sidewall. The first sidewall can be a sidewall with a smaller area of ​​the shell. When the electrode assembly is a wound structure, the corner area of ​​the electrode assembly is close to the first sidewall. The first gap can accumulate more gas. The first gap is connected to the first venting channel so that when the battery cell is depressurized, the gas generated by the electrochemical reaction of the electrode assembly can quickly pass through the first protrusion and flow toward the depressurization mechanism in a timely manner.

[0024] According to some embodiments of this application, the first protrusion extends along a second direction, which is perpendicular to the first direction, and the first ventilation channel passes through the first protrusion along the first direction.

[0025] In the above scheme, the extension direction of the first protrusion can be the length direction of the first protrusion, the extension direction of the first venting channel is perpendicular to the extension direction of the first protrusion, and the extension length of the first venting channel is relatively short, that is, the path of gas passing through the first protrusion is relatively short, which facilitates the gas to pass through the first protrusion quickly and improves the smoothness of gas flow in the first direction.

[0026] According to some embodiments of this application, the first protrusion is provided with a plurality of first ventilation channels, which are spaced apart along a second direction.

[0027] In the above scheme, multiple first ventilation channels are spaced apart along the extension direction of the first protrusion, so that there are multiple gas flow positions on the first protrusion, which is conducive to the gas passing through the protrusion in the first direction and improving the gas passage efficiency.

[0028] According to some embodiments of this application, the first protrusion includes a bottom surface and two third side surfaces. The bottom surface abuts against the electrode assembly, and the two third side surfaces are located at both ends of the bottom surface along a first direction. The two third side surfaces are respectively connected to the bottom surface and the first surface, and a first venting channel passes through the two third side surfaces.

[0029] In the above scheme, the first ventilation channel extends through the two third sides to facilitate the passage of gas through the first protrusion and reduce the obstruction of the gas by the first protrusion.

[0030] According to some embodiments of this application, the first ventilation channel has second openings formed on two third sides, the area of ​​the second opening is S1, and the area of ​​the third side is S2, satisfying 0.2≤S1 / S2≤0.8.

[0031] In the above scheme, the ratio of the area S1 of the second opening to the area S2 of the third side surface satisfies the above relationship (0.2≤S1 / S2≤0.8), which facilitates the passage of gas through the first protrusion, and the overall strength of the first protrusion is high. When there are multiple first ventilation channels, S1 is the sum of the areas of the second openings formed by all the first ventilation channels on the third side surface.

[0032] According to some embodiments of this application, 0.3 ≤ S1 / S2 ≤ 0.7.

[0033] In the above scheme, when the ratio of the area S1 of the second opening to the area S2 of the third side meets the condition 0.3≤S1 / S2≤0.7, the gas can pass through the first protrusion more easily, and the first protrusion also has high strength.

[0034] According to some embodiments of this application, the number of first protrusions is two, and the two first protrusions are located at both ends of the first insulating body along the first direction.

[0035] In the above scheme, there are two first protrusions, which are located at both ends of the first insulating body along the first direction, so as to facilitate the positioning of the electrode assembly at two positions in the first direction, and have a better positioning effect.

[0036] According to some embodiments of this application, a first surface, two first protrusions, and an electrode assembly form a first cavity. Along a first direction, a third gap is formed between the first protrusion and the inner surface of the first sidewall. A first ventilated channel connects the first cavity and the third gap.

[0037] In the above scheme, the first ventilation channel connects the first cavity and the third gap to facilitate the flow of gas on both sides of the first protrusion in the first direction, thereby reducing the obstruction of gas flow by the first protrusion.

[0038] According to some embodiments of this application, the first gap is connected to the third gap.

[0039] In the above scheme, the first gap and the third gap are connected so that the gas in the first gap can flow toward the third gap.

[0040] According to some embodiments of this application, a second gap is formed between the second insulating member and the inner surface of the first sidewall along a first direction, and the second gap communicates with a third gap.

[0041] In the above scheme, the second gap is connected to the third gap to facilitate gas flow between the second gap and the third gap.

[0042] According to some embodiments of this application, the first insulating member further includes a second protrusion, which protrudes from the first surface and is disposed between two first protrusions along the first direction, dividing the first cavity into a first sub-cavity and a second sub-cavity.

[0043] In the above scheme, the second protrusion is disposed between the two first protrusions along the first direction to enhance the positioning effect of the first insulating member on the electrode assembly.

[0044] According to some embodiments of this application, the second protrusion includes two fourth side surfaces disposed opposite to each other along a first direction. The second protrusion is provided with a second venting channel that penetrates the two fourth side surfaces to connect the first sub-cavity and the second sub-cavity.

[0045] In the above scheme, a second ventilation channel is provided on the second protrusion, which connects the first sub-cavity and the second sub-cavity to facilitate the flow of gas between the first sub-cavity and the second sub-cavity.

[0046] According to some embodiments of this application, the second protrusion extends along a second direction, which is perpendicular to the first direction, and the second ventilation channel passes through the second protrusion along the first direction.

[0047] In the above scheme, the extension direction of the second protrusion can be the length direction of the second protrusion, and the extension direction of the second venting channel is perpendicular to the extension direction of the second protrusion. The extension length of the second venting channel is relatively short, that is, the path of gas passing through the second protrusion is relatively short, which facilitates the gas to pass through the second protrusion quickly and improves the smoothness of gas flow in the first direction.

[0048] According to some embodiments of this application, the second protrusion is provided with a plurality of second ventilation channels, which are spaced apart along a second direction.

[0049] In the above scheme, multiple second ventilation channels are spaced apart along the extension direction of the second protrusion, so that there are multiple gas flow positions on the second protrusion, which facilitates the gas to pass through the second protrusion in the first direction and improves the gas passage efficiency.

[0050] According to some embodiments of this application, the battery cell further includes a pressure relief mechanism disposed on the end cover. Along a third direction, the projection of the second protrusion on the end cover at least partially overlaps with the pressure relief mechanism, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0051] In the above scheme, the pressure relief mechanism is located on the end cap so that when the pressure relief mechanism releases the internal pressure of the battery cell, the gas generated by the electrochemical reaction of the electrode assembly can quickly flow toward the pressure relief mechanism.

[0052] According to some embodiments of this application, the second protrusion has a hollow structure, and the first insulating body has a second surface facing away from the electrode assembly, the second surface being provided with a third opening communicating with the interior of the second protrusion.

[0053] In the above scheme, the second protrusion is a hollow structure, and the interior of the second protrusion can collect gas to facilitate gas flow; the gas inside the second protrusion can flow toward the third opening to facilitate the discharge of gas inside the second protrusion and facilitate the pressure relief mechanism to release pressure.

[0054] According to some embodiments of this application, the second protrusion includes two end faces disposed opposite to each other along a second direction. Along the second direction, there is a fourth gap between the end faces and the inner surface of the housing. The second protrusion is provided with a third venting channel, which penetrates through the two end faces and communicates with the fourth gap.

[0055] In the above scheme, the third venting channel runs through both end faces and connects to the fourth gap, so that gas can flow between the inside of the second protrusion and the fourth gap.

[0056] According to some embodiments of this application, the second insulating member is connected to the second protrusion, and the second insulating member does not block the third ventilation channel.

[0057] In the above scheme, the second insulating element does not block the third ventilation channel, so as to facilitate the connection between the fourth gap and the point ventilation channel.

[0058] According to some embodiments of this application, the second insulating member is provided with a third through hole or a second notch to avoid the third ventilation channel.

[0059] In the above scheme, the third through hole facilitates the connection between the fourth gap and the third ventilation channel, and allows the second insulating member and the second protrusion to have a larger connection area; the second notch is formed on the edge of the second insulating member, which facilitates processing and manufacturing.

[0060] According to some embodiments of this application, the housing further includes a bottom wall and two second side walls disposed opposite to each other along a second direction, the first side wall and the second side wall being connected to the bottom wall, and the end cap being disposed opposite to the bottom wall along a third direction, the first direction, the second direction and the third direction being perpendicular to each other; the battery cell further includes a pressure relief mechanism disposed on the bottom wall.

[0061] In the above scheme, the pressure relief mechanism is located on the bottom wall, and the electrode terminals can be located on the end cap to reduce the contamination of the electrode terminals by the excrement released by the pressure relief mechanism.

[0062] Secondly, embodiments of this application also provide a battery, including a battery cell as provided in any of the above embodiments.

[0063] Thirdly, embodiments of this application also provide an electrical device, including a battery cell or battery as provided in any of the above embodiments, wherein the battery cell or battery is used to provide electrical energy.

[0064] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0065] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0066] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0067] Figure 2 Exploded views of batteries provided for some embodiments of this application;

[0068] Figure 3Exploded views of a single battery cell provided in some embodiments of this application;

[0069] Figure 4 This is a schematic diagram of the structure of the first insulating element provided in some embodiments of this application;

[0070] Figure 5 This is a schematic diagram of the structure of a first insulating body provided in some embodiments of this application;

[0071] Figure 6 Cross-sectional views of a battery cell provided in some embodiments of this application;

[0072] Figure 7 for Figure 6 Enlarged view of a portion at point A;

[0073] Figure 8 A cross-sectional view of a partial structure of a battery cell provided in some embodiments of this application;

[0074] Figure 9 A schematic diagram of the structure of the second insulating member having a first through hole provided in some embodiments of this application;

[0075] Figure 10 A schematic diagram of the structure of the second insulating member having a first notch provided in some embodiments of this application;

[0076] Figure 11 A cross-sectional view of a partial structure of a battery cell provided in some other embodiments of this application;

[0077] Figure 12 This is a schematic diagram of the structure of a battery cell provided in some other embodiments of this application;

[0078] Figure 13 A cross-sectional view of a battery cell provided for some embodiments of this application;

[0079] Figure 14 This is a schematic diagram of the structure of the second protrusion provided in some embodiments of this application;

[0080] Figure 15 A cross-sectional view of a battery cell provided for some embodiments of this application;

[0081] Figure 16 This is a schematic diagram of the assembly of the second insulating member and the second protrusion provided in some embodiments of this application;

[0082] Figure 17 for Figure 16 A magnified view of section B;

[0083] Figure 18 This is a schematic diagram of the structure of the pressure relief mechanism provided in some embodiments of this application, which is disposed on the bottom wall;

[0084] Figure 19 Exploded views of a battery cell provided in other embodiments of this application;

[0085] Figure 20 A cross-sectional view of a battery cell provided for some embodiments of this application.

[0086] The accompanying drawings are not drawn to scale.

[0087] Marking Explanation: 100-Battery; 10-Casing; 11-First Sub-Casing; 12-Second Sub-Casing; 20-Battery Cell; 21-Casing; 21a-First Opening; 211-First Side Wall; 212-Second Side Wall; 213-Bottom Wall; 22-End Cap; 23-Electrode Assembly; 23a-First Side; 23b-First End Face; 23c-Second Side; 231-Taper; 232-Main Body; 24-First Insulator; 241-First Insulator Body; 241a-First Surface; 241b-Second Surface; 242-First Protrusion; 242a-Bottom Surface; 242b-Outer Peripheral Surface; 242c-Third Side; 2421-First Vent Channel; 2421a-Second Opening; 2422-Recess; 243-Second Protrusion; 243a-End Face; 243b-Fourth Side; 2 431-Second ventilation channel; 2432-Third opening; 2433-Groove; 2434-Third ventilation channel; 244-Positioning part; 25-Second insulating member; 25a-First insulating part; 25b-Second insulating part; 251-First through hole; 252-First notch; 253-Second through hole; 254-Third through hole; 255-Second notch; 26-Electrode terminal; 27-Pressure relief mechanism; 28-Isolating member; 281-Fourth ventilation channel; 2811-Exhaust groove; 29-Adapter; 200-Controller; 300-Motor; 1000-Vehicle; Q1-First gap; Q2-Second gap; Q3-Third gap; Q4-Fourth gap; P-First cavity; P1-First sub-cavity; P2-Second sub-cavity; X-First direction; Y-Second direction; Z-Thickness direction of the first insulating member. Detailed Implementation

[0088] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0089] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0090] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0091] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0092] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0093] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0094] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0095] In some embodiments, the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0096] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0097] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0098] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0099] The battery cell may be, but is not limited to, lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0100] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0101] 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.

[0102] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0103] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0104] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0105] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0106] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, or made of carbon, nickel, or titanium, etc.

[0107] In some embodiments, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0108] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in batteries. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0109] In some embodiments, the isolation component is an isolation membrane. This application does not impose any particular limitation on the type of isolation membrane; any known porous structure isolation membrane with good chemical and mechanical stability can be selected.

[0110] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator component can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0111] In some embodiments, the isolation component is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0112] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0113] In some implementations, the electrode assembly is a stacked structure.

[0114] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0115] In some embodiments, the housing includes an end cap and a casing, the casing having an opening, and the end cap closing the opening to form a sealed space for accommodating substances such as electrode assemblies and electrolytes. The casing may have one or more openings. The end cap may also be provided one or more times.

[0116] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab via an adapter. The electrode terminal can be located on the end cap or on the housing.

[0117] In some implementations, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cells.

[0118] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. There are no particular limitations in the embodiments of this application.

[0119] The battery cell also includes a pressure relief mechanism, which can be located on the end cap or the housing, to release the internal pressure or temperature of the battery cell.

[0120] The development of battery technology must take into account multiple design factors, such as energy density, discharge capacity, charge-discharge rate and other performance parameters. In addition, battery reliability also needs to be considered.

[0121] A single battery cell includes a casing, an end cap, an electrode assembly, a first insulating member, and a second insulating member. The end cap closes the opening of the casing, the electrode assembly is disposed within the casing, and the first insulating member is disposed between the end cap and the electrode assembly. The first insulating member abuts against the electrode assembly to position it. The second insulating member encloses at least a portion of the electrode assembly and the first insulating member to insulate and isolate the electrode assembly from the casing. When the battery cell is depressurized, because the gas cannot penetrate the second insulating member and is blocked by the first insulating member, the gas generated by the electrochemical reaction in the electrode assembly cannot flow towards the depressurization mechanism in a timely manner. This results in poor depressurization of the battery cell. Gas generated in areas with large gas production cannot quickly flow to the depressurization mechanism for discharge, causing the gas in that area to impact the nearby casing, leading to cracks in the weld between the casing and the end cap, resulting in risks such as fire and explosion, and thus lowering the reliability of the battery cell.

[0122] In view of this, in order to improve the reliability of the battery cell, this application provides a battery cell in which a first insulating member is disposed between the end cap and the electrode assembly. The first insulating member is provided with a first venting channel. Along the first direction, a first gap is formed between the first side of the electrode assembly facing the first sidewall and the second insulating member. The first gap communicates with the first venting channel so that when the battery cell is depressurized, the gas generated by the electrochemical reaction of the electrode assembly can flow quickly, reducing the obstruction of the gas flow by the first insulating member and allowing the gas to flow to the depressurization mechanism in a timely manner, thereby making the battery cell have high reliability.

[0123] In such a battery cell, the first insulating component is provided with a first venting channel, and the second insulating component insulates and isolates the electrode assembly from the housing. Gas cannot penetrate the second insulating component. Since the first gap is connected to the first venting channel, when the battery cell is depressurized, the gas generated by the electrode assembly flows through the first gap to the space between the electrode assembly and the first insulating component along the thickness direction of the first insulating component, and can also flow quickly through the first venting channel. The smooth gas flow reduces the obstruction of the gas flow by the first insulating component, so that the gas can flow to the depressurization mechanism in time for timely depressurization, making the battery cell highly reliable.

[0124] The batteries disclosed in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power system for such electrical equipment can be constructed using battery cells and batteries as disclosed in this application.

[0125] This application provides an electrical device that uses a single battery cell as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric bicycles, electric motorcycles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0126] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0127] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000.

[0128] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0129] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0130] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery provided in some embodiments of this application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 may include a first sub-housing 11 and a second sub-housing 12, which overlap each other, collectively defining a space for accommodating the battery cell 20. The second sub-housing 12 may be a hollow structure with one open end, while the first sub-housing 11 may be a plate-like structure, covering the open side of the second sub-housing 12 so that the first sub-housing 11 and the second sub-housing 12 together define the space. Alternatively, both the first sub-housing 11 and the second sub-housing 12 may be hollow structures with one open side, with the open side of the first sub-housing 11 overlapping the open side of the second sub-housing 12.

[0131] In battery 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, battery 100 can also be composed of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. Battery 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0132] Among them, the battery cell 20 can be a secondary battery or a primary battery; the battery cell 20 can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited to these.

[0133] Please refer to Figures 3 to 7 , Figure 3 These are exploded views of individual battery cells provided in some embodiments of this application. Figure 4 This is a schematic diagram of the structure of the first insulating element provided in some embodiments of this application. Figure 5 This is a schematic diagram of the structure of the first insulating body provided in some embodiments of this application. Figure 6 This is a cross-sectional view of a battery cell provided in some embodiments of this application. Figure 7 for Figure 6 A partial enlarged view at point A. According to some embodiments of this application, this application provides a battery cell 20, which includes a housing 21, an end cap 22, an electrode assembly 23, a first insulating member 24, and a second insulating member 25. The housing 21 has a first opening 21a and includes two first sidewalls 211 disposed opposite each other along a first direction X; the end cap 22 closes the first opening 21a; the electrode assembly 23 is disposed inside the housing 21; the first insulating member 24 is disposed between the end cap 22 and the electrode assembly 23; the second insulating member 25 encloses at least a portion of the electrode assembly 23 and the first insulating member 24 for insulating and isolating the electrode assembly 23 and the housing 21; wherein, the first insulating member 24 is provided with a first venting channel 2421, the electrode assembly 23 includes a first side surface 23a facing the first sidewall 211, and a first gap Q1 is formed between the second insulating member 25 and the first side surface 23a along the first direction X, the first gap Q1 communicating with the first venting channel 2421.

[0134] In the diagram, the direction indicated by the letter X can be the first direction, and the direction indicated by the letter Z can be the thickness direction of the first insulating member 24. The thickness direction Z of the first insulating member 24 can be parallel to the thickness direction of the end cap 22, and the thickness direction Z of the first insulating member 24 can be parallel to the height direction of the battery cell 20.

[0135] The housing 21 is a component used to cooperate with the end cap 22 to form the internal environment of the battery cell 20, wherein the formed internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 21 and the end cap 22 can be independent components. The housing 21 can have various shapes and sizes. Specifically, the shape of the housing 21 can be determined according to the specific shape and size of the electrode assembly 23. The housing 21 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0136] The housing 21 may have one first opening 21a or two first openings 21a. When the housing 21 has two first openings 21a, there are two end caps 22, which are arranged opposite to each other and respectively close the two first openings 21a.

[0137] The first sidewall 211 is a wall portion of the housing 21 located in the first direction X, and the two first sidewalls 211 are respectively located at both ends of the housing 21 in the first direction X. The first sidewall 211 and the other walls of the housing 21 form a receiving space to accommodate the electrode assembly 23. The first sidewall 211 can be a wall portion of the housing 21 with a smaller area; for example, the first sidewall 211 can be a sidewall of the housing 21 in the length direction of the battery cell 20.

[0138] End cap 22 refers to a component that covers the first opening 21a of housing 21 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 22 can be adapted to the shape of housing 21 to fit it. Optionally, end cap 22 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 22 is not easily deformed under pressure and impact, giving battery cell 20 higher structural strength and improved reliability. Functional components such as electrode terminals 26 can be provided on end cap 22. Electrode terminals 26 can be used for electrical connection with electrode assembly 23 to output or input electrical energy to battery cell 20. The material of end cap 22 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this.

[0139] Electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 21 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets to separate them and prevent internal short circuits. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 23, while the portions without active material each constitute tabs 231. The positive and negative tabs may be located together at one end of the main body or at opposite ends. During the charging and discharging process of the battery 100, the positive and negative active materials react with the electrolyte, and the tabs 231 connect to the electrode terminals 26 to form a current loop.

[0140] The battery cell 20 also includes an adapter 29, through which the tab 231 and the electrode terminal 26 are electrically connected.

[0141] A first insulating member 24 is disposed on the side of the end cap 22 facing the electrode assembly 23. The first insulating member 24 is connected to the end cap 22 and is located between the end cap 22 and the electrode assembly 23. The first insulating member 24 can be used to isolate the electrical connection components within the housing 21 from the end cap 22 to reduce the risk of short circuits. For example, the first insulating member 24 can be made of plastic, rubber, etc.

[0142] The second insulating member 25 is a component with electrical insulation function. The second insulating member 25 encloses at least a portion of the electrode assembly 23 and the first insulating member 24 to insulate and isolate the electrode assembly 23 from the housing 21. The second insulating member 25 may also be a membrane structure, such as a Mylar membrane.

[0143] One end of the second insulating member 25 extends beyond the electrode assembly 23 in the thickness direction Z of the first insulating member 24 and extends to the first insulating member 24. The second insulating member 25 may be disposed around the first insulating member 24, and the second insulating member 25 may be connected to the first insulating member 24 or may not be connected to the first insulating member 24.

[0144] The first side surface 23a is the surface of the electrode assembly 23 facing the first sidewall 211. A first gap Q1 is formed between the second insulating member 25 and the first side surface 23a along the first direction X. When the electrode assembly 23 generates gas due to an electrochemical reaction, the gas can accumulate in the first gap Q1 and flow toward the area of ​​the electrode assembly 23 not covered by the second insulating member 25.

[0145] The first gap Q1 is connected to the first venting channel 2421 so that the gas in the first gap Q1 can flow toward the first venting channel 2421, thereby reducing the obstruction of the gas flow by the first insulating member 24.

[0146] The battery cell 20 may also include a pressure relief mechanism 27, which may be located on the end cap 22 or on the housing 21, to release the internal pressure or temperature of the battery cell 20.

[0147] The pressure relief mechanism 27 refers to an element or component that is activated to release internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold. The pressure relief mechanism 27 can take the form of an explosion-proof valve, a gas valve, a pressure relief valve, or a safety valve, and can specifically adopt a pressure-sensitive or temperature-sensitive element or structure. That is, when the internal pressure or temperature of the battery cell 20 reaches the predetermined threshold, the pressure relief mechanism 27 performs an action or a weak structure provided in the pressure relief mechanism 27 is destroyed, thereby forming an opening or channel for the release of internal pressure or temperature.

[0148] The term "actuation" as used in this application refers to the pressure relief mechanism 27 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 20. The action of the pressure relief mechanism 27 may include, but is not limited to, at least a portion of the pressure relief mechanism 27 rupturing, breaking, tearing, or opening. When the pressure relief mechanism 27 is actuated, high-temperature and high-pressure substances (such as gases) inside the battery cell 20 are discharged outwards from the actuated portion. This method allows for pressure and temperature relief of the battery cell 20 under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0149] According to the embodiments of this application, in the battery cell 20, the second insulating member 25 encloses at least a portion of the electrode assembly 23 and the first insulating member 24. The gas generated by the electrochemical reaction of the electrode assembly 23 cannot penetrate the second insulating member 25. Since the first gap Q1 is connected to the first venting channel 2421, when the pressure relief mechanism 27 of the battery cell 20 is depressurized, the gas generated by the electrochemical reaction of the electrode assembly 23 can flow through the first gap Q1 to the space between the electrode assembly 23 and the first insulating member 24 along the thickness direction Z of the first insulating member 24, and can flow quickly through the first venting channel 2421. The gas flow is smooth, reducing the obstruction of the gas flow by the first insulating member 24, so that the gas can flow to the pressure relief mechanism 27 in time for timely pressure relief, making the battery cell 20 have high reliability.

[0150] According to some embodiments of this application, the first insulating member 24 includes a first insulating body 241 and a first protrusion 242. The first insulating body 241 has a first surface 241a facing the electrode assembly 23. The first protrusion 242 protrudes from the first surface 241a and is provided with a first venting channel 2421. The first venting channel 2421 penetrates the first protrusion 242 along a first direction X.

[0151] The thickness direction of the first insulating body 241 is parallel to the thickness direction Z of the first insulating element 24.

[0152] The first insulating body 241 can be a plate-like structure.

[0153] The first protrusion 242 protrudes from the first surface 241a. It can be that the first protrusion 242 and the first insulating body 241 are separately provided, and the first protrusion 242 is connected to the first surface 241a; or it can be that the first protrusion 242 and the first insulating body 241 are integrally formed, and the first protrusion 242 protrudes from the first surface 241a.

[0154] The number of first protrusions 242 can be one or two. When there are two first protrusions 242, the two first protrusions 242 can be respectively disposed corresponding to the two first sidewalls 211. In some embodiments, when the battery cell 20 is depressurized, the gas generated by the electrochemical reaction of the electrode assembly 23 flows through the first gap Q1 to the space between the electrode assembly 23 and the first insulating member 24 in the thickness direction Z, and can quickly pass through the first protrusions 242 to flow to the depressurization mechanism 27 in a timely manner.

[0155] The first protrusion 242 is a portion of the first insulating member 24 that abuts against the electrode assembly 23. "Abutting" means that the first protrusion 242 contacts the electrode assembly 23, which can mean that there is an interaction force between the first protrusion 242 and the electrode assembly 23. The first protrusion 242 can directly abut against the electrode assembly 23, or it can indirectly abut against the electrode assembly 23 through other components. After the battery cell 20 is assembled, the first protrusion 242 contacts the electrode assembly 23, and the first protrusion 242 can restrict the movement of the electrode assembly 23 towards the end wall.

[0156] The first ventilation channel 2421 is a hole that passes through the first protrusion 242 in a direction that intersects with the thickness direction Z of the first insulating member 24. The extension direction of the first ventilation channel 2421 can be parallel to the first surface 241a, or it can intersect with the first surface 241a.

[0157] In some embodiments, please refer to Figure 3Electrode terminals 26 are disposed on end cap 22. Electrode assembly 23 includes a main body 232 and tabs 231 protruding from the main body 232. The main body 232 has a first end face 23b facing the end cap 22. Tabs 231 protrude from the first end face 23b and are electrically connected to electrode terminals 26. The first side face 23a can be the surface of the main body 232 facing the first sidewall 211. A first protrusion 242 contacts the first end face 23b, and part of the tabs 231 is located in the space between the first end face 23b and the end cap 22. There are two electrode terminals 26, a positive electrode terminal and a negative electrode terminal, which are respectively disposed on the end cap. There are two tabs 231, a positive tab and a negative tab, with the positive tab electrically connected to the positive electrode terminal and the negative tab electrically connected to the negative electrode terminal.

[0158] Optionally, the second insulating member 25 extends beyond the first end face 23b in the thickness direction Z of the first insulating member 24.

[0159] In the above scheme, the first protrusion 242 is used to position the electrode assembly 23, and the first venting channel 2421 passes through the first protrusion 242, which can reduce the obstruction of the first protrusion 242 to the gas.

[0160] Please refer to Figure 8 , Figure 8 This is a cross-sectional view of a partial structure of a battery cell provided in some embodiments of this application. According to some embodiments of this application, a second gap Q2 is formed between the second insulating member 25 and the inner surface of the first sidewall 211 along the first direction X, and the second gap Q2 communicates with the first venting channel 2421.

[0161] The second gap Q2 is the space between the second insulating member 25 along the first direction X and the inner surface of the first sidewall 211.

[0162] In some embodiments, when the pressure relief mechanism 27 is disposed in the housing 21, the gas generated by the electrochemical reaction of the electrode assembly 23 can flow through the first protrusion 242 to the second gap Q2, so as to flow toward the pressure relief mechanism 27.

[0163] In some embodiments, the second insulating member 25 may be provided with a hole connecting the first gap Q1 and the second gap Q2, through which gas can enter the second gap Q2, and the gas in the second gap Q2 flows toward the first venting channel 2421 to flow quickly toward the pressure relief mechanism 27.

[0164] In the above scheme, a second gap Q2 is formed between the second insulating member 25 and the inner surface of the first sidewall 211. The second gap Q2 is connected to the first venting channel 2421 so that the gas generated by the electrochemical reaction of the electrode assembly 23 can move between the first sidewall 211 and the second insulating member 25, thereby allowing the gas to flow toward the pressure relief mechanism 27 in a timely manner.

[0165] According to some embodiments of this application, the second insulating member 25 is connected to the first protrusion 242, and the second insulating member 25 does not block the first ventilation channel 2421.

[0166] One end of the second insulating member 25 can be connected to the first protrusion 242. The connection between the second insulating member 25 and the first protrusion 242 can be in various ways. For example, the second insulating member 25 and the first protrusion 242 can be bonded together or heat-fused together.

[0167] There are several ways in which the second insulating member 25 does not block the first venting channel 2421. For example, along the thickness direction Z of the first insulating member 24, the second insulating member 25 may not extend to the first venting channel 2421. Alternatively, the second insulating member 25 may be provided with through holes or notches to allow gas in the second gap Q2 to flow toward the first venting channel 2421.

[0168] In the above scheme, the second insulating member 25 does not block the first ventilation channel 2421, so as to enable the second gap Q2 to communicate with the first ventilation channel 2421.

[0169] Please refer to Figure 8 and further refer to Figure 9 and Figure 10 , Figure 9 This is a schematic diagram of the structure of the second insulating member having a first through hole provided in some embodiments of this application. Figure 10 This is a schematic diagram illustrating the structure of a second insulating member with a first notch provided in some embodiments of this application. According to some embodiments of this application, the second insulating member 25 is provided with a first through hole 251 or a first notch 252 that avoids the first ventilation channel 2421.

[0170] In some embodiments, one end of the second insulating member 25 is connected to the first insulating member 24, and the second insulating member 25 is provided with a first through hole 251, which exposes a first ventilation channel 2421, so that the second insulating member 25 and the first insulating member 24 have a large connection area.

[0171] In some embodiments, a first notch 252 is provided at the edge of the second insulating member 25 so that after the second insulating member 25 is connected to the first insulating member 24, the first ventilation channel 2421 is exposed at the first notch 252.

[0172] In the above scheme, the first through hole 251 or the first notch 252 can avoid the first venting channel 2421, which has a simple structure and is easy to process and manufacture, so as to realize the connection between the second gap Q2 and the first venting channel 2421.

[0173] Please refer to Figure 8 According to some embodiments of this application, the first gap Q1 and the second gap Q2 are connected through the first through hole 251 or the first notch 252.

[0174] The first through hole 251 or the first notch 252 can connect the first gap Q1 and the second gap Q2. Furthermore, since the second gap Q2 is connected to the first venting channel 2421, the gas generated by the electrochemical reaction of the electrode assembly 23 can flow from the first gap Q1 through the first through hole 251 or the first notch 252 to the second gap Q2 and the first venting channel 2421, so that the gas flows smoothly and flows towards the pressure relief mechanism 27 in a timely manner.

[0175] Please refer to Figure 11 , Figure 11 This is a cross-sectional view of a partial structure of a battery cell provided in some embodiments of this application. According to some embodiments of this application, the second insulating member 25 includes a first insulating portion 25a and a second insulating portion 25b. Along the first direction X, the first insulating portion 25a corresponds to a first side surface, and the second insulating portion 25b corresponds to the first insulating member 24. The first insulating portion 25a is provided with a second through hole 253, which connects a first gap Q1 and a second gap Q2. The first through hole 251 or a first notch 252 is provided in the second insulating portion 25b.

[0176] The first insulating part 25a and the second insulating part 25b are connected to each other, and the first insulating part 25a and the second insulating part 25b are arranged sequentially in the thickness direction Z of the first insulating member 24.

[0177] In an embodiment where the electrode assembly 23 includes a main body 232 and a tab 231, the orthogonal projection of the plane containing the first end face 23b onto the second insulating member 25 along the first direction X can be the boundary line between the first insulating portion 25a and the second insulating portion 25b.

[0178] Optionally, the second insulating portion 25b may be located on the side of the first insulating body 241 facing the electrode assembly 23. For example, along the first direction X, the second insulating portion 25b may correspond to the first protrusion 242 of the first insulating member 24.

[0179] The second through hole 253 is a hole provided on the first insulating part 25a, which can connect the first gap Q1 and the second gap Q2.

[0180] There can be multiple second through holes 253, which are spaced apart to allow gas to flow from the first gap Q1 to the second gap Q2. The shape of the second through holes 253 can be various, such as circular, square, or irregular.

[0181] In the above scheme, the first gap Q1 and the second gap Q2 are connected through the second through hole 253, so that the gas in the first gap Q1 can flow towards the first venting channel 2421 through the second gap Q2. The first through hole 251 or the first notch 252 located in the second insulating part 25b, together with the second through hole 253 located in the first insulating part 25a, can facilitate the smooth flow of gas generated by the electrode assembly 23, so as to flow towards the pressure relief mechanism 27.

[0182] Please refer to Figure 3 According to some embodiments of this application, the housing 21 further includes two second sidewalls 212 disposed opposite to each other along a second direction Y, the second direction Y being perpendicular to the first direction X, and the area of ​​the first sidewall 211 being smaller than the area of ​​the second sidewall 212. The electrode assembly 23 includes two first sidewalls 23a and two second sidewalls 23c, the two first sidewalls 23a being disposed opposite to the first sidewall 211 on the same side along the first direction X, and the two second sidewalls 23c being disposed opposite to the second sidewall 212 on the same side along the second direction Y, and the area of ​​the first sidewall 23a being smaller than the area of ​​the second sidewall 23c.

[0183] In the diagram, the direction indicated by the letter Y can be the second direction.

[0184] The second sidewall 212 is the wall portion of the housing 21 in the second direction Y, and the two second sidewalls 212 are respectively located at both ends of the housing 21 in the second direction Y. The two ends of the first sidewall 211 in the second direction Y are respectively connected to the two second sidewalls 212, and the two first sidewalls 211 and the two second sidewalls 212 form a space for accommodating the electrode assembly 23.

[0185] The two second sidewalls 212 and the two first sidewalls 211 can enclose a space for accommodating the electrode assembly 23. In this case, the housing 21 can be rectangular.

[0186] The dimension of the first sidewall 211 in the thickness direction Z of the first insulating member 24 can be equal to the dimension of the second sidewall 212 in the thickness direction Z of the first insulating member 24. The area of ​​the first sidewall 211 can be the area of ​​the first sidewall 211 on the plane formed by the second direction Y and the thickness direction Z of the first insulating member 24, and the area of ​​the second sidewall 212 can be the area of ​​the second sidewall 212 on the plane formed by the first direction X and the thickness direction Z of the first insulating member 24. The area of ​​the first sidewall 211 is smaller than the area of ​​the second sidewall 212, that is, the dimension of the first sidewall 211 in the second direction Y is smaller than the dimension of the second sidewall 212 in the first direction X. The first direction X can be the length direction of the battery cell 20, and the second direction Y can be the thickness direction of the battery cell 20. The first sidewall 211 can be called a narrow wall, and the second sidewall 212 can be called a wide wall. The first sidewall 211 can correspond to the side with a smaller area of ​​the electrode assembly 23, and the second sidewall 212 can correspond to the side with a larger area of ​​the electrode assembly 23.

[0187] Two first side surfaces 23a are arranged opposite each other along the first direction X, and the two first side surfaces 23a correspond to the two first side walls 211 respectively; two second side surfaces 23c are arranged opposite each other along the second direction Y, and the two second side surfaces 23c correspond to the two second side walls 212 respectively.

[0188] In the embodiment where the electrode assembly 23 includes a main body 232 and a tab 231, the first side surface 23a and the second side surface 23c are both surfaces of the main body 232. The first side surface 23a is connected to the first end surface 23b, and the second side surface 23c is connected to the first end surface 23b. The first side surface 23a is the side surface of the electrode assembly 23 with a smaller area, and can be referred to as the narrow surface; the second side surface 23c is the side surface of the electrode assembly 23 with a larger area, and can be referred to as the wide surface.

[0189] When the electrode assembly 23 has a wound structure, the gap between the electrode assembly 23 and the housing 21 is smaller in the second direction Y, resulting in a smaller gap between the second insulating member 25 and the electrode assembly 23, making it less likely for gas to accumulate in this gap. In the first direction X, that is, at the end of the battery cell 20 along its length, the gap between the electrode assembly 23 and the housing 21 is larger, making it easier for gas generated by the electrochemical reaction of the electrode assembly 23 to accumulate in this gap. During the operation of the battery cell 20, the electrode assembly 23 is prone to expansion and deformation in the first direction X, leading to the accumulation of a large amount of gas in the first gap Q1. Most of the gas generated by the electrochemical reaction of the electrode assembly 23 is discharged through the first gap Q1.

[0190] In the above scheme, the area of ​​the first sidewall 211 is smaller than the area of ​​the second sidewall 212. The first sidewall 211 can be a sidewall with a smaller area of ​​the housing 21. When the electrode assembly 23 has a wound structure, the corner area of ​​the electrode assembly 23 is close to the first sidewall 211. When the electrode assembly 23 generates gas due to electrochemical reaction, the first gap Q1 can accumulate a large amount of gas. The first gap Q1 is connected to the first venting channel 2421 so that when the battery cell 20 is depressurized, the gas generated by the electrochemical reaction of the electrode assembly 23 can quickly pass through the first protrusion 242 and flow toward the depressurization mechanism 27 in a timely manner.

[0191] Please refer to Figure 4 and Figure 5 According to some embodiments of this application, the first protrusion 242 extends along the second direction Y, which is perpendicular to the first direction X, and the first ventilation channel 2421 passes through the first protrusion 242 along the first direction X.

[0192] The extension direction of the first protrusion 242 can be the length direction of the first protrusion 242. The extension direction of the first venting channel 2421 is perpendicular to the extension direction of the first protrusion 242. The extension length of the first venting channel 2421 is relatively short, that is, the path of gas through the first protrusion 242 is relatively short, which facilitates the gas to pass through the first protrusion 242 quickly and improves the smoothness of gas flow in the first direction X.

[0193] Please refer to Figure 4 and Figure 5 According to some embodiments of this application, the first protrusion 242 is provided with a plurality of first ventilation channels 2421, and the plurality of first ventilation channels 2421 are spaced apart along the second direction Y.

[0194] Multiple first ventilation channels 2421 are spaced apart along the second direction Y; in other words, multiple first ventilation channels 2421 are spaced apart along the extension direction of the first protrusion 242. The multiple first ventilation channels 2421 may be located on a straight line parallel to the second direction Y, or the multiple first ventilation channels 2421 may be distributed.

[0195] In the above scheme, multiple first ventilation channels 2421 are spaced apart along the extension direction of the first protrusion 242, so that the first protrusion 242 has multiple gas flow positions, which is conducive to the gas passing through the protrusion in the first direction X and improving the gas passage efficiency.

[0196] Please refer to Figure 4 , Figure 5 and Figure 7According to some embodiments of this application, the first protrusion 242 includes a bottom surface 242a and two third side surfaces 242c. The bottom surface 242a abuts against the electrode assembly 23. The two third side surfaces 242c are located at both ends of the bottom surface 242a along the first direction X. The two third side surfaces 242c are respectively connected to the bottom surface 242a and the first surface 241a. The first venting channel 2421 passes through the two third side surfaces 242c.

[0197] The first protrusion 242 may include a bottom surface 242a and an outer peripheral surface 242b. The outer peripheral surface 242b surrounds the bottom surface 242a and connects the bottom surface 242a with the first surface 241a. The two third side surfaces 242c may be two surfaces of the outer peripheral surface 242b that are arranged opposite to each other in the first direction X.

[0198] In some embodiments, the first direction X may be parallel to the width direction of the first protrusion 242, and the two third side surfaces 242c may be two surfaces that are disposed opposite to each other in the width direction of the first protrusion 242.

[0199] The bottom surface 242a is the surface of the first protrusion 242 facing the electrode assembly 23. The bottom surface 242a is used to contact the electrode assembly 23. That is, the bottom surface 242a is the surface of the first protrusion 242 away from the first surface 241a.

[0200] The first ventilation channel 2421 extends through both third side surfaces 242c, and can be located on the outer peripheral surface 242b of the first protrusion 242 as viewed along the first direction X. The first ventilation channel 2421 can extend from one third side surface 242c to the other third side surface 242c.

[0201] In the above scheme, the bottom surface 242a is the surface of the first protrusion 242 that abuts against the electrode assembly 23. By abutting against the electrode assembly 23 through the bottom surface 242a, the first insulating member 24 can be positioned on the electrode assembly 23, and the electrode assembly 23 has good assembly stability. The first venting channel 2421 penetrates through the two third side surfaces 242c, so that gas can pass through the first protrusion 242 and reduce the obstruction of gas flow by the first protrusion 242.

[0202] In some embodiments, in the thickness direction Z of the first insulating member 24, the first venting channel 2421 may extend from the first surface 241a toward the bottom surface 242a. To ensure the strength of the first protrusion 242, there is a certain distance between the first venting channel 2421 and the bottom surface 242a in the thickness direction Z of the first insulating member 24.

[0203] In some embodiments, the extending direction of the first venting channel 2421 may intersect the extending direction of the first protrusion 242, so that gas located on both sides of the extending direction of the first protrusion 242 can pass through the first protrusion 242. For example, the angle between the extending direction of the first venting channel 2421 and the extending direction of the first protrusion 242 may be 70° to 110°. Optionally, this angle may be 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, or 110°. Optionally, the extending direction of the first venting channel 2421 may be perpendicular to the extending direction of the first protrusion 242.

[0204] Please refer to Figure 4 and Figure 5 According to some embodiments of this application, the first ventilation channel 2421 has a second opening 2421a formed on each of the two third side surfaces 242c. The area of ​​the second opening 2421a is S1, and the area of ​​the third side surface 242c is S2, satisfying that 0.2≤S1 / S2≤0.8.

[0205] In some embodiments, the two third side surfaces 242c may form the outer peripheral surface 242b of the first protrusion 242 together with the other surfaces of the first protrusion 242.

[0206] The first ventilation channel 2421 has a second opening 2421a formed on each of the two third sides 242c, so that the first ventilation channel 2421 extends from one third side 242c to the other third side 242c.

[0207] The area S1 of the second opening 2421a refers to the area on the third side 242c where the first ventilation channel 2421 is formed; when there are multiple first ventilation channels 2421, S1 is the sum of the areas of the second opening 2421a formed by all the first ventilation channels 2421 on the third side 242c.

[0208] The area of ​​the third side 242c refers to the area of ​​the third side 242c when no ventilation channel is provided. For example, when the third side 242c is rectangular, the area of ​​the third side 242c can be the length of the rectangle multiplied by the width.

[0209] The ratio of the area S1 of the second opening 2421a to the area S2 of the third side 242c satisfies the above relationship (0.2≤S1 / S2≤0.8), which facilitates the passage of gas through the first protrusion 242, and the first protrusion 242 has high overall strength.

[0210] According to some embodiments of this application, 0.3 ≤ S1 / S2 ≤ 0.7.

[0211] When the ratio of the area S1 of the second opening 2421a to the area S2 of the third side 242c satisfies 0.3≤S1 / S2≤0.7, the gas can pass through the first protrusion 242 more easily, and the first protrusion 242 also has high strength.

[0212] Please refer to Figure 4 and Figure 5 According to some embodiments of this application, there are two first protrusions 242, and the two first protrusions 242 are located at both ends of the first insulating body 241 along the first direction X.

[0213] In the above scheme, there are two first protrusions 242, which are located at both ends of the first insulating body 241 along the first direction X, so as to position the electrode assembly 23 at two positions in the first direction X, and have a better positioning effect.

[0214] Please refer to Figure 8 and further refer to Figure 12 , Figure 12 This is a schematic diagram of the structure of a battery cell provided in some other embodiments of this application. According to some embodiments of this application, a first surface 241a, two first protrusions 242 and an electrode assembly 23 form a first cavity P. Along the first direction X, a third gap Q3 is formed between the first protrusions 242 and the inner surface of the first sidewall 211. A first venting channel 2421 connects the first cavity P and the third gap Q3.

[0215] Two first protrusions 242 respectively abut against the electrode assembly 23. The first cavity P can be the space enclosed by the first surface 241a, the opposing surfaces of the two first protrusions 242, and the side of the electrode assembly 23 facing the first surface 241a.

[0216] The first protrusion 242 does not contact the first sidewall 211 along the first direction X, so that a third gap Q3 is formed between the first protrusion 242 and the inner surface of the first sidewall 211.

[0217] The first ventilation channel 2421 is a hole that passes through the first protrusion 242 along the first direction X, so as to connect the first cavity P and the third gap Q3.

[0218] In the above scheme, the first ventilation channel 2421 connects the first cavity P and the third gap Q3 to facilitate the flow of gas on both sides of the first protrusion 242 in the first direction X, thereby reducing the obstruction of gas flow by the first protrusion 242.

[0219] According to some embodiments of this application, the first gap Q1 is connected to the third gap Q3.

[0220] In embodiments where the second insulating member 25 is provided with a first through hole 251 or a first notch 252, the area of ​​the first through hole 251 or the first notch 252 is large, so that the first gap Q1 and the third gap Q3 are connected.

[0221] In the above scheme, the first gap Q1 is connected to the third gap Q3 so that the gas in the first gap Q1 can flow toward the third gap Q3.

[0222] Please refer to Figure 8 According to some embodiments of this application, along the first direction X, a second gap Q2 is formed between the second insulating member 25 and the inner surface of the first sidewall 211, and the second gap Q2 communicates with the third gap Q3.

[0223] One end of the second insulating member 25 is connected to the first insulating member 24, and along the first direction X, the second gap Q2 and the third gap Q3 may have a partially overlapping area.

[0224] In the above scheme, the second gap Q2 is connected to the third gap Q3 so that gas can flow between the second gap Q2 and the third gap Q3.

[0225] Please refer to Figure 4 and Figure 5 and further refer to Figure 13 , Figure 13 This is a cross-sectional view of a battery cell provided in some embodiments of this application. According to some embodiments of this application, the first insulating member 24 further includes a second protrusion 243, which protrudes from the first surface 241a along the first direction X. The second protrusion 243 is disposed between two first protrusions 242, and the second protrusion 243 divides the first cavity P into a first sub-cavity P1 and a second sub-cavity P2.

[0226] The second protrusion 243 can abut against the electrode assembly 23, and the second protrusion 243 divides the first cavity P into a first sub-cavity P1 and a second sub-cavity P2. In an embodiment where the electrode assembly 23 includes a main body 232 and an electrode tab 231, the positive electrode tab can be located in the first sub-cavity P1, and the negative electrode tab can be located in the second sub-cavity P2.

[0227] In the above scheme, the second protrusion 243 is disposed between the two first protrusions 242 along the first direction X to increase the positioning effect of the first insulating member 24 on the electrode assembly 23.

[0228] According to some embodiments of this application, the second protrusion 243 includes two fourth side surfaces 243b disposed opposite to each other along the first direction X. The second protrusion 243 is provided with a second ventilation channel 2431, which penetrates the two fourth side surfaces 243b to connect the first sub-cavity P1 and the second sub-cavity P2.

[0229] The second ventilation channel 2431 passes through the two opposite fourth sides 243b of the second protrusion 243 in the first direction X, allowing gas to pass quickly through the second protrusion 243 so that gas can flow between the first sub-cavity P1 and the second sub-cavity P2.

[0230] Please refer to Figure 4 and Figure 5 According to some embodiments of this application, the second protrusion 243 extends along the second direction Y, which is perpendicular to the first direction X, and the second ventilation channel 2431 passes through the second protrusion 243 along the first direction X.

[0231] The structure of the second protrusion 243 can be the same as that of the first protrusion 242.

[0232] The extension direction of the second protrusion 243 can be the length direction of the second protrusion 243. The extension direction of the second venting channel 2431 is perpendicular to the extension direction of the second protrusion 243. The extension length of the second venting channel 2431 is relatively short, that is, the path of gas through the second protrusion 243 is relatively short, which facilitates the gas to pass through the second protrusion 243 quickly and improves the smoothness of gas flow in the first direction X.

[0233] Please refer to Figure 4 and Figure 5 According to some embodiments of this application, the second protrusion 243 is provided with a plurality of second ventilation channels 2431, and the plurality of second ventilation channels 2431 are spaced apart along the second direction Y.

[0234] Multiple second ventilation channels 2431 are spaced apart along the second direction Y; in other words, multiple second ventilation channels 2431 are spaced apart along the extension direction of the second protrusion 243. The multiple second ventilation channels 2431 may be located on a straight line parallel to the second direction Y, or the multiple second ventilation channels 2431 may be distributed dispersedly.

[0235] In the above scheme, multiple second ventilation channels 2431 are spaced apart along the extension direction of the second protrusion 243, so that the second protrusion 243 has multiple gas flow positions, which facilitates the gas to pass through the second protrusion 243 in the first direction X and improves the gas passage efficiency.

[0236] In some embodiments, the number and structure of the second ventilation channels 2431 on the second protrusion 243 may be the same as the number and quantity of the first ventilation channels 2421 on the first protrusion 242.

[0237] In some embodiments, when viewed along the first direction X, a plurality of first venting channels 2421 are distributed from the middle of the first protrusion 242 in the second direction Y to both ends. When the pressure relief mechanism 27 is disposed on the end cap 22, when viewed along the first direction X, the plurality of first venting channels 2421 can cover the pressure relief mechanism 27 so that gas can flow quickly toward the pressure relief mechanism 27 after passing through the first protrusion 242.

[0238] Please refer to Figure 3 According to some embodiments of this application, the battery cell 20 further includes a pressure relief mechanism 27, which is disposed on the end cover 22. Along a third direction, the projection of the second protrusion 243 on the end cover 22 at least partially overlaps with the pressure relief mechanism 27, and the first direction X, the second direction Y and the third direction are perpendicular to each other.

[0239] The third direction can be parallel to the thickness direction Z of the first insulating element 24, and the third direction is also parallel to the thickness direction of the end cap 22.

[0240] When viewed from a third direction, the projection of the second protrusion 243 onto the end cap 22 can partially overlap with or completely overlap with the pressure relief mechanism 27.

[0241] In the above scheme, the pressure relief mechanism 27 is provided on the end cap 22 so that when the pressure relief mechanism 27 releases the internal pressure of the battery cell 20, the gas generated by the electrochemical reaction of the electrode assembly 23 can flow quickly toward the pressure relief mechanism 27.

[0242] Please refer to Figure 4 and Figure 5 According to some embodiments of this application, the second protrusion 243 is a hollow structure, and the first insulating body 241 has a second surface 241b facing away from the electrode assembly 23. The second surface 241b is provided with a third opening 2432 communicating with the interior of the second protrusion 243.

[0243] The third opening 2432 is a region provided on the second surface 241b for communicating with the interior of the second protrusion 243. The third opening 2432 can be a cutout on the first insulating member 24. For example, the third opening 2432 can penetrate the first insulating body 241 along the thickness direction Z of the first insulating member 24. That is, the third opening 2432 can extend from the second surface 241b to communicate with the interior of the second protrusion 243.

[0244] In an embodiment where the projection of the second protrusion 243 on the end cap 22 at least partially overlaps with the pressure relief mechanism 27 when viewed along the third direction (Z direction), the projection of the pressure relief mechanism 27 at least partially overlaps with the projection of the third opening 2432 on a plane perpendicular to the third direction. For example, the projection of the pressure relief mechanism 27 may partially overlap with the projection of the third opening 2432, or the projection of the pressure relief mechanism 27 may completely overlap with the projection of the third opening 2432.

[0245] In the above scheme, the pressure relief mechanism 27 is correspondingly arranged with the second protrusion 243. The second protrusion 243 is a hollow structure. The interior of the second protrusion 243 can collect gas and facilitate gas flow. The gas inside the second protrusion 243 can flow toward the third opening 2432, which facilitates the discharge of gas inside the second protrusion 243 and facilitates the pressure relief mechanism 27 to release pressure.

[0246] Please refer to Figures 3 to 5 According to some embodiments of this application, the second surface 241b is provided with a groove 2433 for avoiding the pressure relief mechanism 27.

[0247] The groove 2433 can be the area of ​​the first insulating body 241 for assembly with the pressure relief mechanism 27. The groove 2433 can be formed by recessing from the second surface 241b toward the first surface 241a. The groove 2433 is correspondingly provided with the pressure relief mechanism 27. When viewed along the thickness direction of the end cap 22, the projection of the pressure relief mechanism 27 can be located within the groove 2433.

[0248] The groove 2433 may at least partially overlap with the third opening 2432. For example, the groove 2433 may partially fill the third opening 2432, or the groove 2433 may completely overlap with the third opening 2432.

[0249] In the above scheme, the groove 2433 corresponds to the pressure relief mechanism 27, and the groove 2433 and the third opening 2432 at least partially overlap, so that the gas can flow toward the third opening 2432 after entering the second protrusion 243, so as to quickly reach the pressure relief mechanism 27 and facilitate rapid pressure relief.

[0250] Please refer to Figure 14 and Figure 15 , Figure 14 This is a schematic diagram of the structure of the second protrusion provided in some embodiments of this application. Figure 15This is a cross-sectional view of a battery cell provided in some embodiments of this application. According to some embodiments of this application, the second protrusion 243 includes two end faces 243a disposed opposite each other along the second direction Y. Along the second direction Y, there is a fourth gap Q4 between the end faces 243a and the inner surface of the housing 21. The second protrusion 243 is provided with a third venting channel 2434, which penetrates the two end faces 243a and communicates with the fourth gap Q4.

[0251] The wall portion containing the two end faces 243a and the wall portion containing the two fourth side faces 243b enclose the internal space of the second protrusion 243. The second protrusion 243 is a hollow structure. The internal space of the second protrusion 243 constitutes part of the second ventilation channel 2431. At the same time, the internal space of the second protrusion 243 constitutes part of the third ventilation channel 2434.

[0252] The two end faces 243a are located at opposite ends of the second protrusion 243 along the second direction Y. In an embodiment where the housing 21 includes a second sidewall 212, the end face 243a may be the surface of the second protrusion 243 facing the second sidewall 212.

[0253] The end face 243a does not contact the inner surface of the housing 21 along the second direction Y, so that a fourth gap Q4 is formed between the end cap 22 and the inner surface of the housing 21 along the second direction Y.

[0254] The third ventilation channel 2434 can be a hole provided on the end face 243a and communicating with the interior of the second protrusion 243.

[0255] In the above scheme, the third venting channel 2434 penetrates through both end faces 243a and connects to the fourth gap Q4 so that gas can flow between the interior of the second protrusion 243 and the fourth gap Q4.

[0256] According to some embodiments of this application, the second insulating member 25 is connected to the second protrusion 243, and the second insulating member 25 does not block the third ventilation channel 2434.

[0257] In some embodiments, the area of ​​the second insulating member 25 corresponding to the third venting channel 2434 may be removed to expose the third venting channel 2434. Alternatively, the edge of the second insulating member 25 may not extend into the third venting channel 2434 so that the second insulating member 25 does not obstruct the third venting channel 2434.

[0258] In the above scheme, the second insulating element 25 does not block the third ventilation channel 2434, so as to facilitate the connection between the fourth gap Q4 and the point ventilation channel.

[0259] Please refer to Figure 14 and Figure 15and further refer to Figure 16 and Figure 17 , Figure 16 This is a schematic diagram of the assembly of the second insulating member and the second protrusion provided in some embodiments of this application. Figure 17 for Figure 16 A partial enlarged view of point B. According to some embodiments of this application, the second insulating member 25 is provided with a third through hole 254 or a second notch 255 that avoids the third venting channel 2434.

[0260] In some embodiments, one end of the second insulating member 25 is connected to the second protrusion 243, and the second insulating member 25 is provided with a third through hole 254, which exposes a third ventilation channel 2434, so that the second insulating member 25 and the second protrusion 243 have a large connection area.

[0261] In some embodiments, a second notch 255 is provided at the edge of the second insulating member 25 so that after the second insulating member 25 is connected to the first insulating member 24, the third venting channel 2434 is exposed at the second notch 255.

[0262] In the above scheme, the setting of the third through hole 254 facilitates the connection between the fourth gap Q4 and the third ventilation channel 2434, and the second insulating member 25 and the second protrusion 243 can have a large connection area; the second notch 255 is formed on the edge of the second insulating member 25, which is convenient for processing and manufacturing.

[0263] Please refer to Figure 18 , Figure 18 This is a schematic diagram of a pressure relief mechanism disposed on the bottom wall according to some embodiments of this application. According to some embodiments of this application, the housing 21 further includes a bottom wall 213 and two second side walls 212 disposed opposite each other along a second direction Y. The first side wall 211 and the second side wall 212 are connected to the bottom wall 213. The end cap 22 is disposed opposite to the bottom wall 213 along a third direction, with the first direction X, the second direction Y, and the third direction being perpendicular to each other. The battery cell 20 also includes a pressure relief mechanism 27 disposed on the bottom wall 213.

[0264] In some embodiments, the battery cell 20 further includes an electrode terminal 26 disposed on the end cap 22, and the electrode terminal 26 and the pressure relief mechanism 27 are disposed opposite each other in a third direction.

[0265] Two first sidewalls 211, two second sidewalls 212 and bottom wall 213 form a space for accommodating electrode assembly 23, and the housing 21 may be cuboid.

[0266] In the above scheme, the pressure relief mechanism 27 is provided on the bottom wall 213, and the electrode terminal 26 can be provided on the end cover 22 in order to reduce the contamination of the electrode terminal 26 by the excrement released by the pressure relief mechanism 27.

[0267] Please refer to Figure 19 and Figure 20 , Figure 19 Exploded views of a battery cell provided in other embodiments of this application. Figure 20 This is a cross-sectional view of a battery cell provided in some embodiments of this application. According to some embodiments of this application, a second gap Q2 is formed between the second insulating member 25 and the inner surface of the first sidewall 211 along the first direction X; the battery cell 20 also includes an insulating member 28, which is disposed between the electrode assembly 23 and the bottom wall 213 to isolate the electrode assembly 23 from the bottom wall 213. The insulating member 28 is provided with a fourth venting channel 281, which connects the second gap Q2 and the pressure relief mechanism 27.

[0268] The isolator 28 is a component used to isolate the bottom wall 213 and the electrode assembly 23. The isolator 28 can be an electrically insulating component or a metal component.

[0269] Optionally, the isolator 28 is an electrically insulating component, which insulates the bottom wall 213 and the electrode assembly 23.

[0270] In some embodiments, the spacer 28 can be a base plate, which is disposed below the electrode assembly 23 to support the electrode assembly 23.

[0271] The fourth venting channel 281 can be a channel for guiding gas flow provided on the isolation member 28. The fourth venting channel 281 extends to the edge of the isolation member 28 so that the fourth venting channel 281 communicates with the second gap Q2.

[0272] Along the third direction, the projection of the pressure relief mechanism 27 at least partially overlaps with the fourth venting channel 281, so that the fourth venting channel 281 can communicate with the pressure relief mechanism 27.

[0273] In some embodiments, the fourth venting channel 281 may include a portion facing the electrode assembly 23 and a portion extending through the isolator 28 in a third direction, so that the fourth venting channel 281 connects the second gap Q2 with the pressure relief mechanism 27. In other embodiments, the fourth venting channel 281 is disposed on the side of the isolator 28 facing the bottom wall 213, so that the fourth venting channel 281 connects the second gap Q2 with the pressure relief mechanism 27.

[0274] In the above scheme, the isolation member 28 can isolate the electrode assembly 23 from the bottom wall 213, reducing the risk of contact between the housing 21 and the electrode assembly 23. When the isolation member 28 is located below the electrode assembly 23, it can support the electrode assembly 23, making the electrode assembly 23 stably positioned inside the housing 21 and reducing the risk of movement of the electrode assembly 23. The fourth venting channel 281 connects the second gap Q2 and the pressure relief mechanism 27, facilitating the rapid flow of gas in the second gap Q2 towards the pressure relief mechanism 27.

[0275] Please refer to Figure 20 According to some embodiments of this application, the fourth ventilation channel 281 includes an exhaust groove 2811 disposed on the side of the isolation member 28 facing the bottom wall 213.

[0276] In some embodiments, the exhaust groove 2811 may penetrate the separator 28 along the first direction X so that the fourth venting channel 281 communicates with the second gap Q2.

[0277] The exhaust groove 2811 can be disposed away from the electrode assembly 23. The opening of the exhaust groove 2811 can face the bottom wall 213. The exhaust groove 2811 and the bottom wall 213 can form an exhaust channel. In the third direction, the pressure relief mechanism 27 and the exhaust groove 2811 at least partially overlap, so that the fourth venting channel 281 can connect the second gap Q2 and the pressure relief mechanism 27.

[0278] In the above scheme, the exhaust groove 2811 facilitates the flow of gas between the isolation member 28 and the bottom wall 213, so that the gas can flow quickly toward the pressure relief mechanism 27.

[0279] Please refer to Figure 3 and Figure 19 According to some embodiments of this application, the electrode assembly 23 has a wound structure, and the extension direction of the winding axis of the electrode assembly 23 is perpendicular to the first direction X.

[0280] In some embodiments, electrode terminals 26 may be disposed on end caps 22, the extension direction of the winding axis of electrode assembly 23 may be parallel to the thickness direction (Z direction) of end caps 22, and the tabs of electrode assembly 23 extend from one end of the extension direction of the winding axis of electrode assembly 23 to facilitate connection with electrode terminals 26.

[0281] In the above scheme, the extension direction of the winding axis of the electrode assembly 23 is perpendicular to the first direction X, so that the tabs of the electrode assembly 23 can be connected to the electrode terminals 26 disposed on the end cap 22.

[0282] Please refer to Figure 3 and Figure 19According to some embodiments of this application, there are multiple electrode assemblies 23, and the multiple electrode assemblies 23 are stacked along the second direction Y, which is perpendicular to the first direction X.

[0283] In the above scheme, there are multiple electrode assemblies 23, which facilitates processing and manufacturing.

[0284] According to some embodiments of this application, the first insulating body 241 is a rectangular plate, and the first protrusion 242 extends along the second direction Y, where the second direction Y is the width direction of the first insulating body 241.

[0285] According to some embodiments of this application, the second insulating member 25 is thermally fused with the first insulating member 24, which makes the connection stability between the second insulating member 25 and the protrusion better.

[0286] According to some embodiments of this application, the first insulating body 241 further has a second surface 241b, which is disposed opposite to the first surface 241a along the thickness direction Z of the first insulating member 24. A first protrusion 242 has a recess 2422 formed at a corresponding position on the second surface 241b, which can reduce the weight of the first insulating member 24.

[0287] According to some embodiments of this application, the second surface 241b is provided with a positioning part 244, and the end cap 22 is provided with a positioning hole (not shown in the figure) corresponding to the positioning part 244, and the positioning part 244 is inserted into the positioning hole.

[0288] The positioning part 244 is a component disposed on the second surface 241b for connection and positioning with the end cap 22. The positioning part 244 may protrude from the second surface 241b. The positioning part 244 may be a positioning rod, and the cross-section of the positioning rod may be circular, rectangular, triangular, or irregularly shaped. Optionally, the cross-section of the positioning rod may be circular for ease of processing. The shape of the positioning hole corresponds to the cross-sectional shape of the positioning rod.

[0289] The first insulating component 24 and the end cap 22 are assembled by inserting the positioning part 244 into the positioning hole. The structure is simple and easy to operate.

[0290] According to some embodiments of this application, this application also provides a battery 100, including a battery cell 20 as provided in any of the above embodiments.

[0291] According to some embodiments of this application, this application also provides an electrical device, including a battery cell 20 or a battery 100 as provided in any of the above embodiments, wherein the battery cell 20 or the battery 100 is used to provide electrical energy.

[0292] The electrical equipment can be any of the above-mentioned devices or systems that use battery cell 20 or battery 100.

[0293] According to some embodiments of this application, please refer to Figures 3 to 20 This application provides a battery cell 20, which is cuboid in shape. The battery cell 20 includes a housing 21, an end cap 22, an electrode assembly 23, a first insulating member 24, a second insulating member 25, and electrode terminals 26.

[0294] The housing 21 has a first opening 21a. The housing 21 includes two first sidewalls 211 arranged opposite each other along a first direction X, two second sidewalls 212 arranged opposite each other along a second direction Y, and a bottom wall 213. The first direction X, the second direction Y, and the third direction are perpendicular to each other. The area of ​​the first sidewall 211 is smaller than the area of ​​the second sidewall 212.

[0295] End cap 22 closes the first opening 21a, and electrode terminal 26 is disposed on end cap 22.

[0296] Electrode assembly 23 is disposed within housing 21. Electrode assembly 23 has a wound structure, with the winding axis of electrode assembly 23 extending perpendicularly to a first direction X and parallel to a third direction. A tab of electrode assembly 23 extends from one end of electrode assembly 23 along the winding axis to connect with electrode terminal 26. Electrode assembly 23 includes a first side surface 23a facing the first sidewall 211.

[0297] A first insulating member 24 is disposed between the end cap 22 and the electrode assembly 23. The first insulating member 24 includes a first insulating body 241, two first protrusions 242, and a second protrusion 243. The first insulating body 241 has a first surface 241a facing the electrode assembly 23 and a second surface 241b facing away from the electrode assembly 23. The first protrusions 242 and the second protrusion 243 are both disposed on the first surface 241a. The two first protrusions 242 are located at opposite ends of the first insulating body 241 along a first direction X, and the second protrusion 243 is located between the two first protrusions 242 along the first direction X. The first protrusions 242 and the second protrusion 243 abut against the electrode assembly 23.

[0298] The first insulating body 241 is a rectangular plate, and the first protrusion 242 and the second protrusion 243 both extend along the second direction Y, with the second protrusion 243 being the length direction of the first insulating body 241.

[0299] The first protrusion 242 includes a bottom surface 242a and an outer peripheral surface 242b. The bottom surface 242a abuts against the electrode assembly 23, and the outer peripheral surface 242b surrounds the bottom surface 242a, connecting the bottom surface 242a and the first surface 241a. The first protrusion 242 is provided with a first venting channel 2421, which is located on the outer peripheral surface 242b and extends through the first protrusion 242 along a first direction X. The first protrusion 242 is provided with a plurality of first venting channels 2421, which are spaced apart along a second direction Y. The first protrusion 242 includes two third side surfaces 242c arranged opposite each other along the first direction X. The first ventilation channel 2421 passes through the two third side surfaces 242c. The flow area of ​​the first ventilation channel 2421 is S1, and the area of ​​the third side surface 242c is S2, satisfying that 0.2≤S1 / S2≤0.8.

[0300] The second protrusion 243 is provided with a second ventilation channel 2431. The structure of the second protrusion 243 is the same as that of the first protrusion 242. The number and structure of the second ventilation channels 2431 provided on the second protrusion 243 are the same as the number and structure of the first ventilation channels 2421 provided on the first protrusion 242.

[0301] The second insulating member 25 encloses the electrode assembly 23 and is used to insulate and isolate the electrode assembly 23 and the housing 21. The second insulating member 25 is connected to the first protrusion 242 and the second protrusion 243.

[0302] Along the first direction X, a first gap Q1 is formed between the second insulating member 25 and the first side surface 23a, and the first gap Q1 communicates with the first venting channel 2421. Along the first direction X, a second gap Q2 is formed between the second insulating member 25 and the inner surface of the first side wall 211, and the second gap Q2 communicates with the first venting channel 2421. The second insulating member 25 is provided with a first through hole 251 or a first notch 252 to avoid the first venting channel 2421, and the first gap Q1 and the second gap Q2 communicate through the first through hole 251 or the first notch 252. The second insulating member 25 is provided with a second through hole 253, and the second through hole 253 communicates the first gap Q1 and the second gap Q2.

[0303] The first surface 241a, two first protrusions 242, and electrode assembly 23 form a first cavity P. Along the first direction X, a third gap Q3 is formed between the first protrusions 242 and the inner surface of the first sidewall 211. A first venting channel 2421 connects the first cavity P and the third gap Q3. The first gap Q1 and the third gap Q3 are connected, and the second gap Q2 and the third gap Q3 are connected. The second protrusion 243 divides the first cavity P into a first sub-cavity P1 and a second sub-cavity P2. A second venting channel 2431 connects the first sub-cavity P1 and the second sub-cavity P2.

[0304] In some embodiments, the battery cell 20 further includes a pressure relief mechanism 27 disposed on the end cap 22. Along a third direction, the projection of the second protrusion 243 onto the end cap 22 at least partially overlaps with the pressure relief mechanism 27. The second protrusion 243 is a hollow structure. The first insulating body 241 has a second surface 241b facing away from the electrode assembly 23. The second surface 241b is provided with a third opening 2432 communicating with the interior of the second protrusion 243. A second venting channel 2431 communicates with the interior of the second protrusion 243. The second surface 241b is provided with a groove 2433 for avoiding the pressure relief mechanism 27, and the groove 2433 at least partially overlaps with the third opening 2432. The second protrusion 243 includes two end faces 243a arranged opposite each other along the second direction Y. Along the second direction Y, there is a fourth gap Q4 between the end face 243a and the inner surface of the housing 21. The end face 243a is provided with a third venting channel 2434. The second insulating member 25 is provided with a third through hole 254 or a second notch 255 that avoids the third venting channel 2434. The third venting channel 2434 connects the fourth gap Q4 and the interior of the second protrusion 243.

[0305] In some embodiments, the battery cell 20 further includes a pressure relief mechanism 27 disposed on the bottom wall 213. A second gap Q2 is formed between the second insulating member 25 and the inner surface of the first sidewall 211 along the first direction X. The battery cell 20 also includes an isolator 28 disposed between the electrode assembly 23 and the bottom wall 213 to isolate the electrode assembly 23 from the bottom wall 213. The isolator 28 has a fourth venting channel 281 that connects the second gap Q2 and the pressure relief mechanism 27. The fourth venting channel 281 includes an exhaust groove 2811 disposed on the side of the isolator 28 facing the bottom wall 213.

[0306] According to the battery cell 20 of this application embodiment, the first protrusion 242 is provided with a first venting channel 2421, and the second protrusion 243 is provided with a second venting channel 2431, which can reduce the obstruction of gas flow by the first protrusion 242 and the second protrusion 243. Since the first gap Q1 is connected to the first venting channel 2421, when the battery cell 20 is depressurized, the gas generated by the electrochemical reaction of the electrode assembly 23 can flow through the first gap Q1 toward the first venting channel 2421. The gas can quickly pass through the first protrusion 242 and the second protrusion 243, and the gas flow is smooth, so that the gas can flow to the depressurization mechanism 27 in a timely manner for timely depressurization, making the battery cell 20 have high reliability.

[0307] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: A housing having a first opening, the housing including two first sidewalls disposed opposite each other along a first direction; End cap, to close the first opening; Electrode assembly, disposed within the housing; A first insulating element is disposed between the end cap and the electrode assembly; A second insulating element encloses at least a portion of the electrode assembly and the first insulating element, serving to insulate and isolate the electrode assembly and the housing; The first insulating member is provided with a first venting channel, and the electrode assembly includes a first side facing the first sidewall. Along the first direction, a first gap is formed between the second insulating member and the first side, and the first gap communicates with the first venting channel.

2. The battery cell according to claim 1, characterized in that, The first insulating element includes a first insulating body and a first protrusion. The first insulating body has a first surface facing the electrode assembly. The first protrusion protrudes from the first surface and is provided with a first venting channel that extends through the first protrusion along the first direction.

3. The battery cell according to claim 2, characterized in that, Along the first direction, a second gap is formed between the second insulating member and the inner surface of the first sidewall, and the second gap communicates with the first venting channel.

4. The battery cell according to claim 3, characterized in that, The second insulating element is connected to the first protrusion, and the second insulating element does not block the first ventilation channel.

5. The battery cell according to claim 4, characterized in that, The second insulating element is provided with a first through hole or a first notch to avoid the first venting channel.

6. The battery cell according to claim 5, characterized in that, The first gap and the second gap are connected through the first through hole or the first notch.

7. The battery cell according to claim 5, characterized in that, The second insulating member includes a first insulating portion and a second insulating portion. Along the first direction, the first insulating portion corresponds to the first side surface, and the second insulating portion corresponds to the first insulating member. The first insulating portion is provided with a second through hole, which connects the first gap and the second gap. The first through hole or the first notch is provided in the second insulating portion.

8. The battery cell according to any one of claims 2-7, characterized in that, The housing also includes two second sidewalls disposed opposite each other along a second direction, the second direction being perpendicular to the first direction, and the area of ​​the first sidewall being smaller than the area of ​​the second sidewall; The electrode assembly includes two first side surfaces and two second side surfaces. The two first side surfaces are respectively disposed opposite to the first sidewall on the same side along the first direction, and the two second side surfaces are respectively disposed opposite to the second sidewall on the same side along the second direction. The area of ​​the first side surface is smaller than the area of ​​the second side surface.

9. The battery cell according to any one of claims 2-7, characterized in that, The first protrusion extends along a second direction, which is perpendicular to the first direction, and the first ventilation channel passes through the first protrusion along the first direction.

10. The battery cell according to claim 9, characterized in that, The first protrusion is provided with a plurality of first ventilation channels, and the plurality of first ventilation channels are spaced apart along the second direction.

11. The battery cell according to claim 2, characterized in that, The first protrusion includes a bottom surface and two third side surfaces. The bottom surface abuts against the electrode assembly. The two third side surfaces are located at both ends of the bottom surface along the first direction. The two third side surfaces connect the bottom surface and the first surface, respectively. The first ventilating channel passes through the two third side surfaces.

12. The battery cell according to claim 11, characterized in that, The first ventilation channel has a second opening formed on each of the two third sides. The area of ​​the second opening is S1, and the area of ​​the third side is S2, satisfying that 0.2≤S1 / S2≤0.

8.

13. The battery cell according to claim 12, characterized in that, 0.3≤S1 / S2≤0.

7.

14. The battery cell according to claim 2, characterized in that, The number of the first protrusions is two, and the two first protrusions are located at both ends of the first insulating body along the first direction.

15. The battery cell according to claim 14, characterized in that, The first surface, the two first protrusions, and the electrode assembly form a first cavity. Along the first direction, a third gap is formed between the first protrusion and the inner surface of the first sidewall. The first ventilated channel connects the first cavity and the third gap.

16. The battery cell according to claim 15, characterized in that, The first gap is connected to the third gap.

17. The battery cell according to claim 15, characterized in that, Along the first direction, a second gap is formed between the second insulating member and the inner surface of the first sidewall, and the second gap communicates with the third gap.

18. The battery cell according to any one of claims 15-17, characterized in that, The first insulating member further includes a second protrusion, which protrudes from the first surface and is disposed between two first protrusions along the first direction, dividing the first cavity into a first sub-cavity and a second sub-cavity.

19. The battery cell according to claim 18, characterized in that, The second protrusion includes two fourth side surfaces disposed opposite to each other along the first direction. The second protrusion is provided with a second ventilation channel that penetrates the two fourth side surfaces to connect the first sub-cavity and the second sub-cavity.

20. The battery cell according to claim 19, characterized in that, The second protrusion extends along a second direction, which is perpendicular to the first direction, and the second ventilation channel passes through the second protrusion along the first direction.

21. The battery cell according to claim 20, characterized in that, The second protrusion is provided with a plurality of second ventilation channels, which are spaced apart along the second direction.

22. The battery cell according to claim 20, characterized in that, The battery cell also includes a pressure relief mechanism, which is disposed on the end cap along a third direction. The projection of the second protrusion on the end cap at least partially overlaps with the pressure relief mechanism. The first direction, the second direction, and the third direction are perpendicular to each other.

23. The battery cell according to claim 22, characterized in that, The second protrusion has a hollow structure, and the first insulating body has a second surface that is away from the electrode assembly. The second surface is provided with a third opening that communicates with the interior of the second protrusion.

24. The battery cell according to claim 23, characterized in that, The second protrusion includes two end faces disposed opposite each other along the second direction. Along the second direction, there is a fourth gap between the end faces and the inner surface of the housing. The second protrusion is provided with a third venting channel, which penetrates the two end faces and communicates with the fourth gap.

25. The battery cell according to claim 24, characterized in that, The second insulating member is connected to the second protrusion, and the second insulating member does not block the third ventilation channel.

26. The battery cell according to claim 25, characterized in that, The second insulating member is provided with a third through hole or a second notch to avoid the third ventilation channel.

27. The battery cell according to claim 1, characterized in that, The housing further includes a bottom wall and two second side walls disposed opposite each other along a second direction. The first side wall and the second side wall are connected to the bottom wall. The end cap is disposed opposite to the bottom wall along a third direction. The first direction, the second direction and the third direction are perpendicular to each other. The battery cell also includes a pressure relief mechanism, which is disposed on the bottom wall.

28. A battery, characterized in that, Includes the battery cell as described in any one of claims 1-27.

29. An electrical appliance, characterized in that, Includes the battery as described in claim 28, the battery being used to provide electrical energy.

Images