Battery cell, battery and electric device

Abstract

Provided in the embodiments of the present application are a battery cell, a battery and an electric device. The battery cell comprises a casing, an end cover, an electrode assembly, a first insulating part and a second insulating part, wherein the casing is provided with a first opening, and comprises two first side walls arranged opposite each other in a first direction; the end cover closes the first opening; the electrode assembly is arranged in the casing; the first insulating part is arranged between the end cover and the electrode assembly; the second insulating part wraps at least part of the electrode assembly and at least part of the first insulating part and is used for insulating the electrode assembly from the casing; the first insulating part is provided with first ventilation channels; the electrode assembly comprises first side faces facing the first side walls; first gaps are formed between the second insulating part and the first side faces in the first direction; and the first gaps are in communication with the first ventilation channels. The technical solution of the present application can improve the reliability of the battery.

Description

Battery cells, batteries and electrical equipment

[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 Equipment,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

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

[0005] During the manufacturing process of batteries, battery reliability is an issue that cannot be ignored. Therefore, how to improve battery reliability is a technical problem that needs to be solved urgently in battery technology.

[0006] Summary of the Invention

[0007] The present application provides a battery cell, a battery, and an electrical device, which can improve the reliability of the battery.

[0008] This application is achieved through the following technical solutions:

[0009] In a first aspect, embodiments of the present application provide a battery cell comprising: 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; and the second insulating member surrounds the electrode assembly and at least a portion of the first insulating member to insulate and isolate the electrode assembly from the housing. The first insulating member is provided with a first air permeable channel, and the electrode assembly includes a first side surface facing the first sidewall. A first gap is formed between the second insulating member and the first side surface along the first direction, and the first gap is connected to the first air permeable channel.

[0010] According to the battery cell of the embodiment of the present application, the second insulating member wraps the electrode assembly, and the 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 air permeable 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 flow quickly through the first air permeable channel. The gas flows smoothly, reducing the obstruction of the first insulating member to the gas flow, so that the gas can flow to the pressure relief mechanism in time and release the pressure in time, so that the battery cell has higher reliability.

[0011] According to some embodiments of the present 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 is protruded from the first surface, the first protrusion is provided with a first air permeable channel, and the first air permeable channel passes through the first protrusion along the first direction.

[0012] In the above solution, the first protrusion is used to position the electrode assembly, and the first air permeable channel passes through the first protrusion, which can reduce the obstruction of the first protrusion to the gas.

[0013] According to some embodiments of the present application, a second gap is formed between the second insulating member and the inner surface of the first side wall along the first direction, and the second gap is connected to the first air permeable channel.

[0014] In the above scheme, a second gap is formed between the second insulating member and the inner surface of the first side wall, and the second gap is connected to the first air permeable channel to facilitate the gas generated by the electrochemical reaction of the electrode assembly to move between the first side wall and the second insulating member, so that the gas flows toward the pressure relief mechanism in a timely manner.

[0015] According to some embodiments of the present application, the second insulating member is connected to the first protrusion, and the second insulating member does not block the first air permeable channel.

[0016] In the above solution, the second insulating member does not block the first air permeable channel, so that the second gap is connected to the first air permeable channel.

[0017] According to some embodiments of the present application, the second insulating member is provided with a first through hole or a first notch that avoids the first air permeable channel.

[0018] In the above solution, the first through hole or the first notch can avoid the first air permeable channel, has a simple structure, and is easy to manufacture, so as to achieve communication between the second gap and the first air permeable channel.

[0019] According to some embodiments of the present application, the first gap and the second gap are connected through a first through hole or a first notch.

[0020] In the above scheme, the first gap and the second gap are connected through the first through hole or the first gap, so that the gas generated by the electrochemical reaction of the electrode assembly flows toward the first air permeable channel through the first through hole or the first gap, so that the gas flows smoothly and flows toward the pressure relief mechanism in time.

[0021] According to some embodiments of the present application, 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, and the second through hole connects the first gap and the second gap. The first through hole or the first notch is provided in the second insulating portion.

[0022] In the above embodiment, the first gap and the second gap are connected by the second through-hole, so that the gas in the first gap can flow through the second gap toward the first air permeable channel. The first through-hole or first notch in the second insulating portion, combined with the second through-hole in the first insulating portion, can facilitate the smooth flow of gas generated by the electrode assembly toward the pressure relief mechanism.

[0023] According to some embodiments of the present application, the shell also includes two second side walls arranged opposite to each other along a second direction, the second direction is perpendicular to the first direction, and the area of ​​the first side wall is smaller than the area of ​​the second side wall; the electrode assembly includes two first side surfaces and two second side surfaces, the two first side surfaces are respectively arranged opposite to the first side wall on the same side along the first direction, and the two second side surfaces are respectively arranged opposite to the second side wall on the same side along the second direction, and the area of ​​the first side surface is smaller than the area of ​​the second side surface.

[0024] In the above scheme, the area of ​​the first side wall is smaller than that of the second side wall, and the first side wall can be the side wall 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 side wall, and the first gap can accumulate more gas. The first gap is connected to the first air permeable 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 pressure relief mechanism in time.

[0025] According to some embodiments of the present application, the first protrusion extends along a second direction, the second direction is perpendicular to the first direction, and the first air permeable channel passes through the first protrusion along the first direction.

[0026] In the above scheme, the extension direction of the first protrusion can be the length direction of the first protrusion, and the extension direction of the first air permeable channel is perpendicular to the extension direction of the first protrusion. The extension length of the first air permeable channel is shorter, that is, the path of the gas passing through the first protrusion is shorter, which facilitates the gas to quickly pass through the first protrusion and improves the smoothness of the gas flow in the first direction.

[0027] According to some embodiments of the present application, the first protrusion is provided with a plurality of first air permeable channels, and the plurality of first air permeable channels are arranged at intervals along the second direction.

[0028] In the above solution, the plurality of first air permeable channels are spaced apart along the extension direction of the first protrusion, so that the first protrusion has a plurality of gas flow positions, which is beneficial for the gas to pass through the protrusion in the first direction and improves the gas passing efficiency.

[0029] According to some embodiments of the present application, 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 respectively connect the bottom surface and the first surface, and the first air permeable channel runs through the two third side surfaces.

[0030] In the above solution, the first air permeable channel runs through the two third side surfaces, so that the gas can pass through the first protrusion, thereby reducing the obstruction of the first protrusion to the gas.

[0031] According to some embodiments of the present application, the first ventilation channel is formed with second openings on two third side surfaces, the area of ​​the second opening is S1, and the area of ​​the third side surface is S2, satisfying 0.2≤S1 / S2≤0.8.

[0032] In the above embodiment, the ratio of the area S1 of the second opening to the area S2 of the third side surface satisfies the aforementioned relationship (0.2 ≤ S1 / S2 ≤ 0.8), facilitating gas flow through the first protrusion and providing enhanced overall strength. If there are multiple first air passages, S1 is the sum of the areas of the second openings formed on the third side surface by all of the first air passages.

[0033] According to some embodiments of the present application, 0.3≤S1 / S2≤0.7.

[0034] In the above solution, when the ratio of the area S1 of the second opening to the area S2 of the third side surface satisfies 0.3≤S1 / S2≤0.7, gas can pass through the first protrusion more easily, and the first protrusion also has higher strength.

[0035] According to some embodiments of the present application, there are two first protrusions, and the two first protrusions are located at two ends of the first insulating body along the first direction.

[0036] In the above solution, there are two first protrusions, which are located at both ends of the first insulating body along the first direction, so as to facilitate positioning of the electrode assembly at two positions in the first direction, thereby achieving a better positioning effect.

[0037] According to some embodiments of the present application, 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 side wall. The first air permeable channel connects the first cavity and the third gap.

[0038] In the above solution, the first air permeable 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 the first protrusion to the gas flow.

[0039] According to some embodiments of the present application, the first gap is communicated with the third gap.

[0040] In the above solution, the first gap is communicated with the third gap, so that the gas in the first gap flows toward the third gap.

[0041] According to some embodiments of the present application, a second gap is formed between the second insulating member and the inner surface of the first sidewall along the first direction, and the second gap is connected to the third gap.

[0042] In the above solution, the second gap is connected to the third gap, so that the gas flows between the second gap and the third gap.

[0043] According to some embodiments of the present application, the first insulating member further includes a second protrusion, which is protruding from the first surface and disposed between two first protrusions along the first direction. The second protrusion separates the first cavity into a first sub-cavity and a second sub-cavity.

[0044] In the above solution, the second protrusion is arranged between the two first protrusions along the first direction to enhance the positioning effect of the first insulating member on the electrode assembly.

[0045] According to some embodiments of the present application, the second protrusion includes two fourth side surfaces arranged opposite to each other along the first direction, and the second protrusion is provided with a second air permeable channel, which runs through the two fourth side surfaces to connect the first sub-cavity and the second sub-cavity.

[0046] In the above solution, a second air permeable channel is provided on the second protrusion, and the second air permeable channel connects the first sub-cavity and the second sub-cavity to facilitate gas flow between the first sub-cavity and the second sub-cavity.

[0047] According to some embodiments of the present application, the second protrusion extends along a second direction, the second direction is perpendicular to the first direction, and the second air permeable channel passes through the second protrusion along the first direction.

[0048] 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 air permeable channel is perpendicular to the extension direction of the second protrusion. The extension length of the second air permeable channel is shorter, that is, the path of the gas passing through the second protrusion is shorter, which facilitates the gas to pass through the second protrusion quickly and improves the smoothness of the gas flow in the first direction.

[0049] According to some embodiments of the present application, the second protrusion is provided with a plurality of second air permeable channels, and the plurality of second air permeable channels are arranged at intervals along the second direction.

[0050] In the above solution, the plurality of second air permeable channels are spaced apart along the extension direction of the second protrusion, so that the second protrusion has a plurality of gas circulation positions, which is beneficial for the gas to pass through the second protrusion in the first direction and improves the gas passing efficiency.

[0051] According to some embodiments of the present application, the battery cell further includes a pressure relief mechanism, which is disposed on the end cover. Along the 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.

[0052] In the above solution, the pressure relief mechanism is provided on the end cover 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.

[0053] According to some embodiments of the present application, the second protrusion is a hollow structure, the first insulating body has a second surface facing away from the electrode assembly, and the second surface is provided with a third opening communicating with the interior of the second protrusion.

[0054] In the above solution, the second protrusion is a hollow structure, and the interior of the second protrusion can gather gas to facilitate gas circulation; the gas inside the second protrusion can flow toward the third opening to facilitate the discharge of gas in the second protrusion and the pressure relief mechanism to release pressure.

[0055] According to some embodiments of the present application, the second protrusion includes two end faces arranged opposite to each other along the second direction, and there is a fourth gap between the end faces and the inner surface of the shell along the second direction. The second protrusion is provided with a third air permeable channel, which runs through the two end faces and is connected to the fourth gap.

[0056] In the above solution, the third air permeable channel runs through the two end surfaces, and the third air permeable channel is connected to the fourth gap, so that the gas flows between the inside of the second protrusion and the fourth gap.

[0057] According to some embodiments of the present application, the second insulating member is connected to the second protrusion, and the second insulating member does not block the third air permeable channel.

[0058] In the above solution, the second insulating member does not block the third air permeable channel, so as to facilitate the communication between the fourth gap and the point air permeable channel.

[0059] According to some embodiments of the present application, the second insulating member is provided with a third through hole or a second notch that avoids the third air permeable channel.

[0060] In the above solution, the provision of the third through hole facilitates the connection between the fourth gap and the third air permeable channel on the one hand, and on the other hand, the second insulating member and the second protrusion can have a larger connection area; the second notch is formed at the edge of the second insulating member for easy processing and manufacturing.

[0061] According to some embodiments of the present application, the shell also includes a bottom wall and two second side walls arranged opposite to each other along a second direction, the first side wall and the second side wall are connected to the bottom wall, the end cover and the bottom wall are arranged opposite to each other along a third direction, and 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 arranged on the bottom wall.

[0062] In the above solution, the pressure relief mechanism is arranged on the bottom wall, and the electrode terminal can be arranged on the end cover, so as to reduce the contamination of the electrode terminal by the excrement discharged by the pressure relief mechanism.

[0063] In a second aspect, an embodiment of the present application further provides a battery, comprising a battery cell as provided in any of the above embodiments.

[0064] In a third aspect, an embodiment of the present application further provides an electrical device, comprising 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.

[0065] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0067] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0068] FIG2 is an exploded view of a battery provided in some embodiments of the present application;

[0069] FIG3 is an exploded view of a battery cell provided in some embodiments of the present application;

[0070] FIG4 is a schematic structural diagram of a first insulating member provided in some embodiments of the present application;

[0071] FIG5 is a schematic structural diagram of a first insulating body provided in some embodiments of the present application;

[0072] FIG6 is a cross-sectional view of a battery cell provided in some embodiments of the present application;

[0073] FIG7 is a partial enlarged view of point A in FIG6 ;

[0074] FIG8 is a cross-sectional view of a partial structure of a battery cell provided in some embodiments of the present application;

[0075] FIG9 is a schematic structural diagram of a second insulating member provided with a first through hole according to some embodiments of the present application;

[0076] FIG10 is a schematic structural diagram of a second insulating member provided with a first notch according to some embodiments of the present application;

[0077] FIG11 is a cross-sectional view of a partial structure of a battery cell provided in some other embodiments of the present application;

[0078] FIG12 is a schematic structural diagram of a battery cell provided in other embodiments of the present application;

[0079] FIG13 is a cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0080] FIG14 is a schematic structural diagram of a second protrusion provided in some embodiments of the present application;

[0081] FIG15 is a cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0082] FIG16 is a schematic diagram of the assembly of a second insulating member and a second protrusion according to some embodiments of the present application;

[0083] FIG17 is a partial enlarged view of point B in FIG16;

[0084] FIG18 is a schematic diagram of a structure in which a pressure relief mechanism is provided on a bottom wall according to some embodiments of the present application;

[0085] FIG19 is an exploded view of a battery cell provided in some other embodiments of the present application;

[0086] FIG20 is a cross-sectional view of a battery cell provided in some other embodiments of the present application.

[0087] In the drawings, the drawings are not drawn to scale.

[0088] Marking instructions: 100 - battery; 10 - housing; 11 - first sub-housing; 12 - second sub-housing; 20 - battery cell; 21 - housing; 21a - first opening; 211 - first side wall; 212 - second side wall; 213 - bottom wall; 22 - end cap; 23 - electrode assembly; 23a - first side surface; 23b - first end surface; 23c - second side surface; 231 - tab; 232 - main body; 24 - first insulating member; 241 - first insulating body; 24 1a - first surface; 241b - second surface; 242 - first protrusion; 242a - bottom surface; 242b - outer peripheral surface; 242c - third side surface; 2421 - first ventilation channel; 2421a - second opening; 2422 - recessed portion; 243 - second protrusion; 243a - end surface; 243b - fourth side surface; 2431 - second ventilation channel; 2432 - third opening; 2433 - groove; 2434 - third ventilation channel; 244 - positioning portion; 25-second insulating member; 25a-first insulating portion; 25b-second insulating portion; 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 air permeable 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 DESCRIPTION

[0089] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0090] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0091] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0092] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0093] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0094] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0095] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0096] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0097] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0098] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0099] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0100] The battery cells may be, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0101] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, located between the positive and negative electrodes, prevents short circuits while allowing the active ions to pass through.

[0102] 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.

[0103] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0104] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0105] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0106] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0107] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium.

[0108] In some embodiments, the negative electrode current collector has two opposite surfaces in its 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.

[0109] As an example, the negative electrode active material may be a negative electrode active material for a battery that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0110] In some embodiments, the isolation component is an isolation membrane. The present application has no particular limitation on the type of isolation membrane, and any known porous isolation membrane with good chemical and mechanical stability can be selected.

[0111] As an example, the primary 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 can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0112] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0113] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0114] In some embodiments, the electrode assembly is a laminate structure.

[0115] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0116] In some embodiments, the housing includes an end cap and a shell. The shell has an opening, and the end cap closes the opening to form a sealed space for accommodating the electrode assembly, electrolyte, and other substances. The shell may have one or more openings. One or more end caps may also be provided.

[0117] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to a tab of the electrode assembly. The electrode terminal may be directly connected to the tab or indirectly connected to the tab via an adapter. The electrode terminal may be provided on an end cap or on the housing.

[0118] In some embodiments, the housing is provided with an explosion-proof valve for releasing the internal pressure of the battery cell.

[0119] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a polygonal battery. The polygonal battery is, for example, a hexagonal battery, etc. There is no special limitation in the embodiments of the present application.

[0120] The battery cell further includes a pressure relief mechanism, which may be provided on the end cover or the housing to release the internal pressure or temperature of the battery cell.

[0121] The development of battery technology must take into account multiple design factors at the same time, such as energy density, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery reliability must also be considered.

[0122] The battery cell includes a shell, an end cover, an electrode assembly, a first insulating member and a second insulating member. The end cover closes the opening of the shell, the electrode assembly is arranged in the shell, and the first insulating member is arranged between the end cover and the electrode assembly. The first insulating member abuts against the electrode assembly to achieve positioning of the electrode assembly. The second insulating member wraps the electrode assembly and at least a portion of the first insulating member to insulate and isolate the electrode assembly from the shell. When the battery cell is depressurized, since the gas cannot penetrate the second insulating member and is blocked by the first insulating member, the gas generated by the electrochemical reaction of the electrode assembly cannot flow toward the pressure relief mechanism in time, resulting in poor pressure relief of the battery cell. The gas generated in the area with a large gas production cannot flow quickly to the pressure relief mechanism for discharge, causing the gas in this area to impact the nearby shell, causing the weld between the shell and the end cover to crack, resulting in risks such as fire and explosion, and making the reliability of the battery cell low.

[0123] In view of this, in order to improve the reliability of the battery cell, an embodiment of the present application provides a battery cell, wherein a first insulating member is arranged between the end cover and the electrode assembly, and the first insulating member is provided with a first air permeable channel. Along the first direction, a first gap is formed between the first side surface of the electrode assembly facing the first side wall and the second insulating member, and the first gap is connected to the first air permeable 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 first insulating member to the gas flow, and flowing to the pressure relief mechanism in time, so that the battery cell has higher reliability.

[0124] In such a battery cell, the first insulating member is provided with a first air permeable channel, and the second insulating member insulates and isolates the electrode assembly from the shell, and the gas cannot penetrate the second insulating member. Since the first gap is connected to the first air permeable 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 member along the thickness direction of the first insulating member, and can flow quickly through the first air permeable channel. The gas flows smoothly, reducing the obstruction of the first insulating member to the gas flow, so that the gas can flow to the pressure relief mechanism in time and release the pressure in time, so that the battery cell has higher reliability.

[0125] The battery disclosed in the embodiments of the present application can be used, but is not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power supply system of the electrical equipment can be composed of the battery cells and batteries disclosed in the present application.

[0126] The embodiments of the present application provide an electrical device that uses a battery cell as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0127] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0128] Please refer to Figure 1, which is a schematic diagram of the structure of the vehicle provided in some embodiments of the present application. Vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, such as for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0129] The vehicle 1000 may further 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, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0130] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0131] Please refer to Figure 2, which is an exploded view of a battery provided in some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 being housed within the housing 10. The housing 10 is used to provide a storage space for the battery cell 20, and the housing 10 can adopt a variety of structures. In some embodiments, the housing 10 can include a first sub-housing 11 and a second sub-housing 12, which cover each other and together define a storage space for accommodating the battery cell 20. The second sub-housing 12 can be a hollow structure with one end open, and the first sub-housing 11 can be a plate-like structure, with the first sub-housing 11 covering the open side of the second sub-housing 12, so that the first sub-housing 11 and the second sub-housing 12 jointly define a storage space; the first sub-housing 11 and the second sub-housing 12 can also be hollow structures with one end open, with the open side of the first sub-housing 11 covering the open side of the second sub-housing 12.

[0132] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0133] The battery cell 20 may be a secondary battery or a primary battery; the battery cell 20 may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0134] Please refer to Figures 3 to 7. Figure 3 is an exploded view of a battery cell provided in some embodiments of the present application. Figure 4 is a schematic structural diagram of a first insulating member provided in some embodiments of the present application. Figure 5 is a schematic structural diagram of a first insulating body provided in some embodiments of the present application. Figure 6 is a cross-sectional view of a battery cell provided in some embodiments of the present application. Figure 7 is a partial enlarged view of point A in Figure 6. According to some embodiments of the present application, a battery cell 20 is provided. The battery cell 20 includes a housing 21, an end cap 22, an electrode assembly 23, a first insulating member 24, and a second insulating member 25. The shell 21 has a first opening 21a, and the shell 21 includes two first side walls 211 arranged opposite to each other along the first direction X; the end cover 22 closes the first opening 21a; the electrode assembly 23 is arranged in the shell 21; the first insulating member 24 is arranged between the end cover 22 and the electrode assembly 23; the second insulating member 25 wraps the electrode assembly 23 and at least a portion of the first insulating member 24, and is used to insulate and isolate the electrode assembly 23 and the shell 21; wherein, the first insulating member 24 is provided with a first air permeable channel 2421, and the electrode assembly 23 includes a first side surface 23a facing the first side wall 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, and the first gap Q1 is connected to the first air permeable channel 2421.

[0135] In the figure, the direction indicated by the letter X may be the first direction, and the direction indicated by the letter Z may be the thickness direction of the first insulating member 24. The thickness direction Z of the first insulating member 24 may be parallel to the thickness direction of the end cap 22, and the thickness direction Z of the first insulating member 24 may be parallel to the height direction of the battery cell 20.

[0136] The housing 21 is a component that cooperates with the end cap 22 to form the internal environment of the battery cell 20. This internal environment can be used to 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 be of various shapes and sizes. Specifically, the shape of the housing 21 can be determined by the specific shape and size of the electrode assembly 23. The housing 21 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, and aluminum alloys.

[0137] 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 covers 22, which are arranged opposite to each other and respectively close the two first openings 21a.

[0138] The first sidewall 211 is a wall portion of the housing 21 located in the first direction X. The two first sidewalls 211 are 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 storage space for accommodating 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 along the length direction of the battery cell 20.

[0139] The end cap 22 refers to a component that covers the first opening 21a of the shell 21 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 22 can be adapted to the shape of the shell 21 to match the shell 21. Optionally, the end cap 22 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 22 is not easily deformed when squeezed or collided, so that the battery cell 20 can have a higher structural strength and improved reliability. Functional components such as electrode terminals 26 can be provided on the end cap 22. The electrode terminal 26 can be used to electrically connect to the electrode assembly 23 for outputting or inputting electrical energy of the battery cell 20. The material of the end cap 22 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.

[0140] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be contained in the housing 21. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The separator is used to separate the positive and negative electrode sheets to avoid internal short circuits between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 23, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 231. The positive and negative electrode tabs may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 100, the positive active material and the negative active material react with the electrolyte, and the tab 231 connects to the electrode terminal 26 to form a current loop.

[0141] The battery cell 20 further includes a transition piece 29 , through which the tab 231 and the electrode terminal 26 are electrically connected.

[0142] The 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 in 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.

[0143] The second insulating member 25 is a component with electrical insulation function, and the second insulating member 25 wraps the electrode assembly 23 and at least a portion of the first insulating member 24 to insulate the electrode assembly 23 from the housing 21. The second insulating member 25 can also be a film structure, such as a Mylar film.

[0144] 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 reaches the first insulating member 24. The second insulating member 25 may be disposed around the first insulating member 24 and may be connected to or disconnected from the first insulating member 24.

[0145] The first side surface 23a is a surface of the electrode assembly 23 that faces 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 that is not covered by the second insulating member 25.

[0146] The first gap Q1 is in communication with the first air permeable channel 2421 , so that the gas in the first gap Q1 can flow toward the first air permeable channel 2421 , thereby reducing the obstruction of the first insulating member 24 to the gas flow.

[0147] The battery cell 20 may further include a pressure relief mechanism 27 . The pressure relief mechanism 27 may be provided on the end cover 22 or the housing 21 to release the internal pressure or temperature of the battery cell 20 .

[0148] The pressure relief mechanism 27 is an element or component that activates to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature 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 employ a pressure-sensitive or temperature-sensitive element or structure. Specifically, when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold, the pressure relief mechanism 27 activates or a weakened structure within the pressure relief mechanism 27 is destroyed, thereby creating an opening or channel for the internal pressure or temperature to be released.

[0149] The "activation" mentioned in this application means that the pressure relief mechanism 27 is in action or activated to a certain state, so that the internal pressure and temperature of the battery cell 20 can be released. The action produced by the pressure relief mechanism 27 may include but is not limited to: at least a part of the pressure relief mechanism 27 is broken, shattered, torn or opened, etc. When the pressure relief mechanism 27 is actuated, the high-temperature and high-pressure substances (such as gas) inside the battery cell 20 will be discharged outward from the actuated part as exhaust. In this way, the battery cell 20 can be depressurized and cooled under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0150] According to the battery cell 20 of the embodiment of the present application, the second insulating member 25 wraps the electrode assembly 23 and at least a portion of 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 air permeable channel 2421, when the pressure relief mechanism 27 of the battery cell 20 releases pressure, 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 air permeable channel 2421. The gas flows smoothly, reducing the obstruction of the first insulating member 24 to the gas flow, so that the gas can flow to the pressure relief mechanism 27 in time and release pressure in time, so that the battery cell 20 has higher reliability.

[0151] According to some embodiments of the present 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 is protruded from the first surface 241a, and the first protrusion 242 is provided with a first air permeable channel 2421, and the first air permeable channel 2421 passes through the first protrusion 242 along the first direction X.

[0152] The thickness direction of the first insulating body 241 is parallel to the thickness direction Z of the first insulating member 24 .

[0153] The first insulating body 241 may be a plate-shaped structure.

[0154] The first protrusion 242 is protruded from the first surface 241a. 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 the first protrusion 242 and the first insulating body 241 are integrally formed, and the first protrusion 242 protrudes from the first surface 241a.

[0155] 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 provided corresponding to the two first sidewalls 211. In some embodiments, when the battery cell 20 is depressurized, the gas generated by the electrochemical reaction in 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 of the first insulating member 24, and can quickly pass through the first protrusions 242 and flow to the pressure relief mechanism 27 in a timely manner.

[0156] The first protrusion 242 is the portion of the first insulating member 24 that abuts the electrode assembly 23. Abutment means that the first protrusion 242 contacts the electrode assembly 23, and may also include a mutual force between the first protrusion 242 and the electrode assembly 23. The first protrusion 242 may abut the electrode assembly 23 directly or indirectly 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 toward the end wall.

[0157] The first ventilation channel 2421 is a hole that passes through the first protrusion 242 in a direction intersecting the thickness direction Z of the first insulating member 24 . The extension direction of the first ventilation channel 2421 may be parallel to the first surface 241 a or may intersect with the first surface 241 a .

[0158] In some embodiments, referring to FIG. 3 , an electrode terminal 26 is disposed on the end cap 22. The electrode assembly 23 includes a main body 232 and a tab 231 protruding from the main body 232. The main body 232 has a first end surface 23b facing the end cap 22. The tab 231 protrudes from the first end surface 23b and is electrically connected to the electrode terminal 26. The first side surface 23a may be the surface of the main body 232 facing the first sidewall 211. The first protrusion 242 contacts the first end surface 23b, and a portion of the tab 231 is located in the space between the first end surface 23b and the end cap 22. There are two electrode terminals 26, one positive electrode terminal and one negative electrode terminal, respectively, disposed on the end cap. There are two tabs 231, one positive tab and one negative tab, respectively. The positive tab is electrically connected to the positive electrode terminal, and the negative tab is electrically connected to the negative electrode terminal.

[0159] Optionally, the second insulating member 25 extends beyond the first end surface 23 b in the thickness direction Z of the first insulating member 24 .

[0160] In the above solution, the first protrusion 242 is used to position the electrode assembly 23 , and the first air permeable channel 2421 passes through the first protrusion 242 , which can reduce the obstruction of the first protrusion 242 to gas.

[0161] Please refer to Figure 8, which is a cross-sectional view of a partial structure of a battery cell provided by some embodiments of the present application. According to some embodiments of the present 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. The second gap Q2 is connected to the first ventilation channel 2421.

[0162] 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 .

[0163] In some embodiments, when the pressure relief mechanism 27 is disposed in the housing 21 , gas generated by the electrochemical reaction in the electrode assembly 23 can pass through the first protrusion 242 and flow to the second gap Q2 , thereby flowing toward the pressure relief mechanism 27 .

[0164] In some embodiments, the second insulating member 25 may be provided with a hole connecting the first gap Q1 and the second gap Q2, and gas can enter the second gap Q2 through the hole. The gas in the second gap Q2 flows toward the first air permeable channel 2421 to quickly flow toward the pressure relief mechanism 27.

[0165] In the above scheme, a second gap Q2 is formed between the second insulating member 25 and the inner surface of the first side wall 211. The second gap Q2 is connected to the first air permeable channel 2421, so that the gas generated by the electrochemical reaction of the electrode assembly 23 can move between the first side wall 211 and the second insulating member 25, so that the gas can flow toward the pressure relief mechanism 27 in a timely manner.

[0166] According to some embodiments of the present application, the second insulating member 25 is connected to the first protrusion 242 , and the second insulating member 25 does not block the first air permeable channel 2421 .

[0167] One end of the second insulating member 25 can be connected to the first protrusion 242 . The second insulating member 25 and the first protrusion 242 can be connected in various ways. For example, the second insulating member 25 and the first protrusion 242 can be bonded or connected by hot melt.

[0168] There can be many ways for the second insulating member 25 to not block the first air permeable 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 air permeable channel 2421, or the second insulating member 25 may be provided with a through hole or a notch to allow the gas in the second gap Q2 to flow toward the first air permeable channel 2421.

[0169] In the above solution, the second insulating member 25 does not block the first air permeable channel 2421 , so that the second gap Q2 is connected to the first air permeable channel 2421 .

[0170] Please refer to Figure 8, and further to Figures 9 and 10. Figure 9 is a schematic diagram of the structure of the second insulating member provided with a first through hole according to some embodiments of the present application, and Figure 10 is a schematic diagram of the structure of the second insulating member provided with a first notch according to some embodiments of the present application. According to some embodiments of the present application, the second insulating member 25 is provided with a first through hole 251 or a first notch 252 that avoids the first air permeable channel 2421.

[0171] 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 the first air permeable channel 2421 so that the second insulating member 25 and the first insulating member 24 have a larger connection area.

[0172] In some embodiments, the first notch 252 is disposed at an 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 .

[0173] In the above solution, the first through hole 251 or the first notch 252 can avoid the first air permeable channel 2421 , and has a simple structure and is easy to manufacture, so as to achieve communication between the second gap Q2 and the first air permeable channel 2421 .

[0174] Referring to FIG. 8 , according to some embodiments of the present application, the first gap Q1 and the second gap Q2 are connected via a first through hole 251 or a first notch 252 .

[0175] The first through hole 251 or the first notch 252 can connect the first gap Q1 and the second gap Q2, and since the second gap Q2 is connected to the first air permeable 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 air permeable channel 2421, so that the gas flows smoothly and flows toward the pressure relief mechanism 27 in a timely manner.

[0176] Please refer to Figure 11, which is a cross-sectional view of a partial structure of a battery cell provided in some other embodiments of the present application. According to some embodiments of the present 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 the 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 the first gap Q1 and the second gap Q2. The first through hole 251 or the first notch 252 is provided in the second insulating portion 25b.

[0177] The first insulating portion 25 a and the second insulating portion 25 b are connected to each other, and the first insulating portion 25 a and the second insulating portion 25 b are sequentially arranged in the thickness direction Z of the first insulating member 24 .

[0178] In the embodiment where the electrode assembly 23 includes the main body 232 and the tab 231 , the orthographic projection of the plane where the first end surface 23 b is located on the second insulating member 25 along the first direction X may be the boundary between the first insulating portion 25 a and the second insulating portion 25 b .

[0179] Optionally, the second insulating portion 25 b may be located on a side of the first insulating body 241 facing the electrode assembly 23 . For example, along the first direction X, the second insulating portion 25 b may correspond to the first protrusion 242 of the first insulating member 24 .

[0180] The second through hole 253 is a hole provided on the first insulating portion 25 a and can connect the first gap Q1 and the second gap Q2 .

[0181] There can be multiple second through holes 253 , which are spaced apart to facilitate gas flow from the first gap Q1 to the second gap Q2 . The second through holes 253 can have various shapes, such as circular, square, or irregular shapes.

[0182] In the above embodiment, 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 through the second gap Q2 toward the first air permeable channel 2421. The first through-hole 251 or the first notch 252 in the second insulating portion 25b, in conjunction with the second through-hole 253 in the first insulating portion 25a, can facilitate the smooth flow of gas generated by the electrode assembly 23 toward the pressure relief mechanism 27.

[0183] Referring to FIG. 3 , according to some embodiments of the present application, the housing 21 further includes two second side walls 212 disposed opposite each other along a second direction Y, the second direction Y being perpendicular to the first direction X, and the area of ​​the first side wall 211 being smaller than the area of ​​the second side wall 212. The electrode assembly 23 includes two first side surfaces 23 a and two second side surfaces 23 c. The two first side surfaces 23 a are disposed opposite each other to the first side wall 211 on the same side along the first direction X, and the two second side surfaces 23 c are disposed opposite each other to the second side wall 212 on the same side along the second direction Y, and the area of ​​the first side surface 23 a is smaller than the area of ​​the second side surface 23 c.

[0184] In the figure, the direction indicated by the letter Y may be the second direction.

[0185] The second sidewall 212 is a wall portion of the housing 21 in the second direction Y. The two second sidewalls 212 are respectively located at the two 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. The two first sidewalls 211 and the two second sidewalls 212 enclose a space for accommodating the electrode assembly 23.

[0186] The two second side walls 212 and the two first side walls 211 may enclose a space for accommodating the electrode assembly 23. In this case, the housing 21 may be in the shape of a rectangular parallelepiped.

[0187] 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 in the plane defined by the second direction Y and the thickness direction Z of the first insulating member 24, while the area of ​​the second sidewall 212 can be the area of ​​the second sidewall 212 in the plane defined 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 referred to as a narrow wall, and the second sidewall 212 can be referred to as a wide wall. The first sidewall 211 can correspond to the smaller side of the electrode assembly 23, while the second sidewall 212 can correspond to the larger side of the electrode assembly 23.

[0188] The two first side surfaces 23 a are oppositely arranged along the first direction X, and the two first side surfaces 23 a correspond to the two first side walls 211 respectively; the two second side surfaces 23 c are oppositely arranged along the second direction Y, and the two second side surfaces 23 c correspond to the two second side walls 212 respectively.

[0189] 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 of the electrode assembly 23 with a smaller area and can be referred to as a narrow side. The second side surface 23c is the side of the electrode assembly 23 with a larger area and can be referred to as a wide side.

[0190] When the electrode assembly 23 has a wound structure, the gap between the electrode assembly 23 and the housing 21 is small 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, i.e., at the longitudinal ends of the battery cell 20, the gap between the electrode assembly 23 and the housing 21 is larger, and gas generated by the electrochemical reaction in the electrode assembly 23 is more likely to accumulate in this gap. During operation of the battery cell 20, the electrode assembly 23 is prone to expansion and deformation in the first direction X, resulting in a large amount of gas accumulating in the first gap Q1. Most of the gas generated by the electrochemical reaction in the electrode assembly 23 is discharged through the first gap Q1.

[0191] In the above embodiment, the area of ​​the first sidewall 211 is smaller than the area of ​​the second sidewall 212. The first sidewall 211 can be the sidewall of the housing 21 with the smaller area. 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 the electrochemical reaction, a large amount of gas can accumulate in the first gap Q1. The first gap Q1 is connected to the first vent channel 2421. When the battery cell 20 is depressurized, the gas generated by the electrochemical reaction in the electrode assembly 23 can quickly pass through the first protrusion 242 and flow toward the pressure relief mechanism 27 in a timely manner.

[0192] 4 and 5 , according to some embodiments of the present application, the first protrusion 242 extends along the second direction Y, which is perpendicular to the first direction X. The first ventilation channel 2421 passes through the first protrusion 242 along the first direction X.

[0193] The extension direction of the first protrusion 242 can be the length direction of the first protrusion 242, and the extension direction of the first air permeable channel 2421 is perpendicular to the extension direction of the first protrusion 242. The extension length of the first air permeable channel 2421 is shorter, that is, the path of the gas passing through the first protrusion 242 is shorter, which facilitates the gas to quickly pass through the first protrusion 242 and improves the smoothness of the gas flow in the first direction X.

[0194] 4 and 5 , according to some embodiments of the present application, the first protrusion 242 is provided with a plurality of first ventilation channels 2421 , and the plurality of first ventilation channels 2421 are arranged at intervals along the second direction Y.

[0195] The plurality of first ventilation channels 2421 are spaced apart along the second direction Y. In other words, the plurality of first ventilation channels 2421 are spaced apart along the extending direction of the first protrusion 242. The plurality of first ventilation channels 2421 may be located on a straight line parallel to the second direction Y, or may be dispersed.

[0196] In the above solution, multiple first air permeable channels 2421 are arranged at intervals along the extension direction of the first protrusion 242, so that there are multiple gas flow positions on the first protrusion 242, which is conducive to the gas passing through the protrusion in the first direction X and improves the gas passing efficiency.

[0197] Please refer to Figures 4, 5 and 7. According to some embodiments of the present 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 respectively connect the bottom surface 242a and the first surface 241a. The first air permeable channel 2421 passes through the two third side surfaces 242c.

[0198] The first protrusion 242 may include a bottom surface 242a and an outer peripheral surface 242b, the outer peripheral surface 242b is arranged around the bottom surface 242a, and the outer peripheral surface 242b connects the bottom surface 242a and the first surface 241a; the two third side surfaces 242c may be two surfaces of the outer peripheral surface 242b arranged opposite to each other in the first direction X.

[0199] 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 242 c may be two surfaces opposite to each other in the width direction of the first protrusion 242 .

[0200] The bottom surface 242 a is the surface of the first protrusion 242 facing the electrode assembly 23 , and is used to contact the electrode assembly 23 . That is, the bottom surface 242 a is the surface of the first protrusion 242 away from the first surface 241 a .

[0201] The first air passage 2421 passes through the two third side surfaces 242c and may be provided on the outer peripheral surface 242b of the first protrusion 242 as viewed along the first direction X. The first air passage 2421 may extend from one third side surface 242c to the other third side surface 242c.

[0202] In the above embodiment, bottom surface 242a is the surface of first protrusion 242 that abuts electrode assembly 23. This abutment of bottom surface 242a with electrode assembly 23 enables first insulating member 24 to position electrode assembly 23, providing good assembly stability for electrode assembly 23. First air passage 2421 extends through both third side surfaces 242c to facilitate gas flow through first protrusion 242, reducing obstruction to gas flow caused by first protrusion 242.

[0203] In some embodiments, the first ventilation channel 2421 may extend from the first surface 241a toward the bottom surface 242a in the thickness direction Z of the first insulating member 24. To ensure the strength of the first protrusion 242, a certain distance is provided between the first ventilation channel 2421 and the bottom surface 242a in the thickness direction Z of the first insulating member 24.

[0204] In some embodiments, the extension direction of the first air permeable channel 2421 may intersect the extension direction of the first protrusion 242, allowing gas on both sides of the extension direction of the first protrusion 242 to pass through the first protrusion 242. For example, the angle between the extension direction of the first air permeable channel 2421 and the extension direction of the first protrusion 242 may be 70° to 110°. Alternatively, the angle may be 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, or 110°. Optionally, the extension direction of the first air permeable channel 2421 is perpendicular to the extension direction of the first protrusion 242.

[0205] 4 and 5 , according to some embodiments of the present application, the first ventilation channel 2421 has second openings 2421 a formed on the two third side surfaces 242 c , respectively. The area of ​​the second opening 2421 a is S1 , and the area of ​​the third side surface 242 c is S2 , satisfying 0.2≤S1 / S2≤0.8.

[0206] In some embodiments, the two third side surfaces 242 c and other surfaces of the first protrusion 242 may constitute the outer peripheral surface 242 b of the first protrusion 242 .

[0207] The first air permeable channel 2421 has second openings 2421 a formed on the two third side surfaces 242 c respectively, so that the first air permeable channel 2421 extends from one third side surface 242 c to the other third side surface 242 c.

[0208] The area S1 of the second opening 2421a refers to the area where the first ventilation channel 2421 is formed on the third side 242c; when there are multiple first ventilation channels 2421, S1 is the sum of the areas of the second openings 2421a formed by all the first ventilation channels 2421 on the third side 242c.

[0209] The area of ​​the third side surface 242c refers to the area of ​​the third side surface 242c when no ventilation channel is provided. For example, when the third side surface 242c is a rectangle, the area of ​​the third side surface 242c may be the length times the width of the rectangle.

[0210] The ratio of the area S1 of the second opening 2421a to the area S2 of the third side surface 242c satisfies the above relationship (0.2≤S1 / S2≤0.8), which facilitates gas passing through the first protrusion 242 and increases the overall strength of the first protrusion 242.

[0211] According to some embodiments of the present application, 0.3≤S1 / S2≤0.7.

[0212] When the ratio of the area S1 of the second opening 2421 a to the area S2 of the third side surface 242 c satisfies 0.3≦S1 / S2≦0.7, gas can more easily pass through the first protrusion 242 , and the first protrusion 242 also has higher strength.

[0213] 4 and 5 , according to some embodiments of the present application, there are two first protrusions 242 , and the two first protrusions 242 are located at two ends of the first insulating body 241 along the first direction X.

[0214] In the above solution, 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 facilitate positioning of the electrode assembly 23 at two positions in the first direction X, with a better positioning effect.

[0215] Please refer to Figure 8 and further to Figure 12, which is a schematic structural diagram of a battery cell according to other embodiments of the present application. According to some embodiments of the present application, the first surface 241a, the two first protrusions 242, and the 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. The first air permeable channel 2421 connects the first cavity P and the third gap Q3.

[0216] The two first protrusions 242 are respectively in contact with the electrode assembly 23 . The first cavity P may be a space enclosed by the first surface 241 a , the opposite surfaces of the two first protrusions 242 , and one side of the electrode assembly 23 facing the first surface 241 a .

[0217] 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 .

[0218] The first ventilation channel 2421 is a hole that passes through the first protrusion 242 along the first direction X to connect the first cavity P and the third gap Q3.

[0219] In the above solution, the first air permeable 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 the first protrusion 242 to the gas flow.

[0220] According to some embodiments of the present application, the first gap Q1 is connected to the third gap Q3 .

[0221] In the embodiment where the second insulating member 25 is provided with the first through hole 251 or the first notch 252 , the area of ​​the first through hole 251 or the first notch 252 is relatively large, so that the first gap Q1 is connected to the third gap Q3 .

[0222] In the above solution, the first gap Q1 is connected to the third gap Q3 so that the gas in the first gap Q1 flows toward the third gap Q3.

[0223] 8 , according to some embodiments of the present 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 is connected to the third gap Q3 .

[0224] One end of the second insulating member 25 is connected to the first insulating member 24 . Along the first direction X, the second gap Q2 and the third gap Q3 may have a partially overlapping area.

[0225] In the above solution, the second gap Q2 communicates with the third gap Q3 so that gas flows between the second gap Q2 and the third gap Q3.

[0226] Please refer to Figures 4 and 5, and further to Figure 13, which is a cross-sectional view of a battery cell according to some embodiments of the present application. According to some embodiments of the present application, the first insulating member 24 further includes a second protrusion 243, which is provided on the first surface 241a and disposed between the two first protrusions 242 along the first direction X. The second protrusion 243 divides the first cavity P into a first sub-cavity P1 and a second sub-cavity P2.

[0227] 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 the embodiment where the electrode assembly 23 includes a main body 232 and a 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.

[0228] In the above solution, the second protrusion 243 is disposed between the two first protrusions 242 along the first direction X to enhance the positioning effect of the first insulating member 24 on the electrode assembly 23 .

[0229] According to some embodiments of the present application, the second protrusion 243 includes two fourth side surfaces 243b arranged opposite to each other along the first direction X. The second protrusion 243 is provided with a second air permeable channel 2431, which passes through the two fourth side surfaces 243b to connect the first sub-cavity P1 and the second sub-cavity P2.

[0230] The second air permeable channel 2431 passes through two fourth side surfaces 243 b of the second protrusion 243 that are opposite in the first direction X. Gas can quickly pass through the second protrusion 243 to facilitate gas flow between the first sub-cavity P1 and the second sub-cavity P2.

[0231] 4 and 5 , according to some embodiments of the present application, the second protrusion 243 extends along a 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.

[0232] The structure of the second protrusion 243 may be the same as that of the first protrusion 242 .

[0233] The extension direction of the second protrusion 243 can be the length direction of the second protrusion 243, and the extension direction of the second air permeable channel 2431 is perpendicular to the extension direction of the second protrusion 243. The extension length of the second air permeable channel 2431 is shorter, that is, the path of the gas passing through the second protrusion 243 is shorter, which facilitates the gas to quickly pass through the second protrusion 243 and improves the smoothness of the gas flow in the first direction X.

[0234] 4 and 5 , according to some embodiments of the present application, the second protrusion 243 is provided with a plurality of second ventilation channels 2431 , and the plurality of second ventilation channels 2431 are arranged at intervals along the second direction Y.

[0235] The plurality of second ventilation channels 2431 are spaced apart along the second direction Y. In other words, the plurality of second ventilation channels 2431 are spaced apart along the extending direction of the second protrusion 243. The plurality of second ventilation channels 2431 may be located on a straight line parallel to the second direction Y, or may be dispersed.

[0236] In the above solution, multiple second air permeable channels 2431 are spaced apart along the extension direction of the second protrusion 243, so that there are multiple gas circulation positions on the second protrusion 243, which is conducive to the gas passing through the second protrusion 243 in the first direction X and improves the gas passing efficiency.

[0237] In some embodiments, the number and structure of the second air permeable channels 2431 on the second protrusion 243 may be the same as the number and structure of the first air permeable channels 2421 on the first protrusion 242 .

[0238] In some embodiments, when viewed along the first direction X, the plurality of first ventilation channels 2421 are dispersed from the middle portion of the first protrusion 242 in the second direction Y toward 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 ventilation channels 2421 can cover the pressure relief mechanism 27 , allowing gas to quickly flow toward the pressure relief mechanism 27 after passing through the first protrusion 242 .

[0239] Referring to Figure 3, according to some embodiments of the present application, the battery cell 20 further includes a pressure relief mechanism 27, which is disposed on the end cover 22. Along the 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.

[0240] The third direction may be parallel to the thickness direction Z of the first insulating member 24 , and the third direction is also parallel to the thickness direction of the end cover 22 .

[0241] When viewed along the third direction, the projection of the second protrusion 243 on the end cover 22 may partially overlap or completely overlap with the pressure relief mechanism 27 .

[0242] In the above solution, the pressure relief mechanism 27 is provided on the end cover 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 quickly flow toward the pressure relief mechanism 27 .

[0243] 4 and 5 , according to some embodiments of the present application, the second protrusion 243 is a hollow structure, the first insulating body 241 has a second surface 241 b facing away from the electrode assembly 23 , and the second surface 241 b is provided with a third opening 2432 communicating with the interior of the second protrusion 243 .

[0244] The third opening 2432 is an area provided on the second surface 241b for communicating with the interior of the second protrusion 243. The third opening 2432 may be a hollow portion on the first insulating member 24. For example, the third opening 2432 may penetrate the first insulating body 241 along the thickness direction Z of the first insulating member 24. In other words, the third opening 2432 may extend from the second surface 241b to communicate with the interior of the second protrusion 243.

[0245] In an embodiment where the projection of the second protrusion 243 on the end cover 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.

[0246] In the above scheme, the pressure relief mechanism 27 is arranged corresponding to the second protrusion 243. The second protrusion 243 is a hollow structure. The interior of the second protrusion 243 can gather gas and facilitate gas circulation; the gas located inside the second protrusion 243 can flow toward the third opening 2432, which is convenient for discharging the gas in the second protrusion 243 and facilitating the pressure relief mechanism 27 to release pressure.

[0247] 3 to 5 , according to some embodiments of the present application, the second surface 241 b is provided with a groove 2433 for avoiding the pressure relief mechanism 27 .

[0248] Recess 2433 may be an area of ​​first insulating body 241 for assembly with pressure relief mechanism 27. Recess 2433 may be formed by recessing second surface 241b toward first surface 241a. Recess 2433 is provided corresponding to pressure relief mechanism 27. When viewed along the thickness of end cap 22, the projection of pressure relief mechanism 27 may be located within recess 2433.

[0249] 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 .

[0250] In the above solution, the groove 2433 corresponds to the pressure relief mechanism 27, and the groove 2433 at least partially overlaps with the third opening 2432, so that the gas enters the second protrusion 243 and flows toward the third opening 2432 to quickly reach the pressure relief mechanism 27, thereby facilitating rapid pressure relief.

[0251] Please refer to Figures 14 and 15. Figure 14 is a schematic diagram of the structure of a second protrusion according to some embodiments of the present application, and Figure 15 is a cross-sectional view of a battery cell according to still other embodiments of the present application. According to some embodiments of the present application, the second protrusion 243 includes two end surfaces 243a arranged opposite each other along the second direction Y. Along the second direction Y, a fourth gap Q4 is defined between the end surfaces 243a and the inner surface of the housing 21. The second protrusion 243 is provided with a third ventilation channel 2434, which extends through the two end surfaces 243a and communicates with the fourth gap Q4.

[0252] The wall portions where the two end faces 243a are located and the wall portions where the two fourth side faces 243b are located 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 a part of the second air permeable channel 2431. At the same time, the internal space of the second protrusion 243 constitutes a part of the third air permeable channel 2434.

[0253] The two end surfaces 243 a are respectively located at opposite ends of the second protrusion 243 along the second direction Y. In the embodiment where the housing 21 includes a second sidewall 212 , the end surface 243 a may be a surface of the second protrusion 243 facing the second sidewall 212 .

[0254] The end surface 243 a 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 cover 22 and the inner surface of the housing 21 along the second direction Y.

[0255] The third ventilation channel 2434 may be a hole provided on the end surface 243 a and communicating with the interior of the second protrusion 243 .

[0256] In the above solution, the third air permeable channel 2434 passes through the two end surfaces 243 a and is connected to the fourth gap Q4 , so that gas can flow between the inside of the second protrusion 243 and the fourth gap Q4 .

[0257] According to some embodiments of the present application, the second insulating member 25 is connected to the second protrusion 243 , and the second insulating member 25 does not block the third air permeable channel 2434 .

[0258] In some embodiments, the area of ​​the second insulating member 25 corresponding to the third ventilation channel 2434 can be removed to expose the third ventilation channel 2434. Alternatively, the edge of the second insulating member 25 does not extend to the third ventilation channel 2434 so that the second insulating member 25 does not block the third ventilation channel 2434.

[0259] In the above solution, the second insulating member 25 does not block the third air permeable channel 2434 , so as to facilitate the communication between the fourth gap Q4 and the point air permeable channel.

[0260] Please refer to Figures 14 and 15, and further to Figures 16 and 17. Figure 16 is a schematic diagram of the assembly of the second insulating member and the second protrusion according to some embodiments of the present application, and Figure 17 is a partial enlarged view of point B in Figure 16. According to some embodiments of the present application, the second insulating member 25 is provided with a third through hole 254 or a second notch 255 that avoids the third air permeable channel 2434.

[0261] In some embodiments, one end of the second insulating member 25 is connected to the second protrusion 243 . The second insulating member 25 is provided with a third through hole 254 . The third through hole 254 exposes the third ventilation channel 2434 , so that the second insulating member 25 and the second protrusion 243 have a larger connection area.

[0262] In some embodiments, the second notch 255 is disposed at an 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 vent channel 2434 is exposed at the second notch 255 .

[0263] In the above solution, the provision of the third through hole 254 facilitates the communication between the fourth gap Q4 and the third air permeable channel 2434 on the one hand, and on the other hand, the second insulating member 25 and the second protrusion 243 can have a larger connection area; the second notch 255 is formed at the edge of the second insulating member 25 for easy processing and manufacturing.

[0264] Please refer to Figure 18, which is a schematic diagram of a structure in which a pressure relief mechanism is provided on the bottom wall in some embodiments of the present application. According to some embodiments of the present application, the housing 21 further includes a bottom wall 213 and two second side walls 212 arranged opposite each other along the 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 arranged opposite the bottom wall 213 along the third direction, with the first direction X, the second direction Y, and the third direction being perpendicular to each other. The battery cell 20 further includes a pressure relief mechanism 27, which is arranged on the bottom wall 213.

[0265] In some embodiments, the battery cell 20 further includes an electrode terminal 26 . The electrode terminal 26 is disposed on the end cover 22 . The electrode terminal 26 and the pressure relief mechanism 27 are disposed opposite to each other along the third direction.

[0266] The two first side walls 211 , the two second side walls 212 and the bottom wall 213 form a space for accommodating the electrode assembly 23 . The housing 21 may be in the shape of a rectangular parallelepiped.

[0267] In the above solution, 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 , so as to reduce the contamination of the electrode terminal 26 by the excrement discharged by the pressure relief mechanism 27 .

[0268] Please refer to Figures 19 and 20. Figure 19 is an exploded view of a battery cell according to some other embodiments of the present application, and Figure 20 is a cross-sectional view of a battery cell according to some other embodiments of the present application. According to some embodiments of the present application, a second gap Q2 is formed between the second insulating member 25 and the inner surface of the first side wall 211 along the first direction X. The battery cell 20 also includes a separator 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 separator 28 is provided with a fourth air permeable channel 281, which connects the second gap Q2 with the pressure relief mechanism 27.

[0269] The separator 28 is a component used to separate the bottom wall 213 and the electrode assembly 23. The separator 28 can be an electrically insulating component or a metal component.

[0270] Optionally, the separator 28 is an electrically insulating component, and the separator 28 insulates and isolates the bottom wall 213 and the electrode assembly 23 .

[0271] In some embodiments, the isolation member 28 may be a bottom support plate. The isolation member 28 is disposed below the electrode assembly 23 to support the electrode assembly 23 .

[0272] The fourth air permeable channel 281 may be a channel for guiding gas flow provided in the separator 28. The fourth air permeable channel 281 extends to the edge of the separator 28 so that the fourth air permeable channel 281 communicates with the second gap Q2.

[0273] Along the third direction, the projection of the pressure relief mechanism 27 at least partially overlaps with the fourth air permeable channel 281 , so that the fourth air permeable channel 281 is in communication with the pressure relief mechanism 27 .

[0274] In some embodiments, the fourth air permeable channel 281 may include a portion facing the electrode assembly 23 and a portion extending through the separator 28 along the third direction, such that the fourth air permeable channel 281 connects the second gap Q2 with the pressure relief mechanism 27. In other embodiments, the fourth air permeable channel 281 is disposed on a side of the separator 28 facing the bottom wall 213, such that the fourth air permeable channel 281 connects the second gap Q2 with the pressure relief mechanism 27.

[0275] In the above embodiment, the provision of separator 28 can isolate electrode assembly 23 from bottom wall 213, reducing the risk of contact between housing 21 and electrode assembly 23. When separator 28 is positioned below electrode assembly 23, separator 28 can support electrode assembly 23, ensuring stable positioning of electrode assembly 23 within housing 21 and reducing the risk of movement of electrode assembly 23. Fourth air permeable channel 281 connects second gap Q2 with pressure relief mechanism 27, facilitating rapid flow of gas within second gap Q2 toward pressure relief mechanism 27.

[0276] Referring to FIG. 20 , according to some embodiments of the present application, the fourth ventilation channel 281 includes an exhaust groove 2811 disposed on a side of the isolation member 28 facing the bottom wall 213 .

[0277] In some embodiments, the exhaust groove 2811 may penetrate the isolation member 28 along the first direction X so that the fourth air permeable channel 281 communicates with the second gap Q2.

[0278] The exhaust groove 2811 can be set away from the electrode assembly 23, and the opening of the exhaust groove 2811 can face the bottom wall 213. The exhaust groove 2811 can form an exhaust channel with the bottom wall 213. Along the third direction, the pressure relief mechanism 27 and the exhaust groove 2811 at least partially overlap, so that the fourth air permeable channel 281 connects the second gap Q2 and the pressure relief mechanism 27.

[0279] In the above solution, the exhaust groove 2811 can facilitate the flow of gas between the isolation member 28 and the bottom wall 213 , so that the gas can quickly flow toward the pressure relief mechanism 27 .

[0280] 3 and 19 , according to some embodiments of the present application, the electrode assembly 23 is a wound structure, and the extension direction of the winding axis of the electrode assembly 23 is perpendicular to the first direction X.

[0281] In some embodiments, the electrode terminal 26 can be arranged on the end cover 22, the extension direction of the winding axis of the electrode assembly 23 can be parallel to the thickness direction (Z direction) of the end cover 22, and the electrode tab of the electrode assembly 23 extends from one end of the extension direction of the winding axis of the electrode assembly 23 to facilitate connection with the electrode terminal 26.

[0282] In the above solution, 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 are connected to the electrode terminals 26 provided on the end cap 22 .

[0283] 3 and 19 , according to some embodiments of the present application, there are multiple electrode assemblies 23 , and the multiple electrode assemblies 23 are stacked along a second direction Y, which is perpendicular to the first direction X.

[0284] In the above solution, there are multiple electrode assemblies 23 to facilitate processing and manufacturing.

[0285] According to some embodiments of the present application, the first insulating body 241 is a rectangular plate, and the first protrusion 242 extends along the second direction Y, which is the width direction of the first insulating body 241 .

[0286] According to some embodiments of the present application, the second insulating member 25 is connected to the first insulating member 24 by thermal melting, so that the connection stability between the second insulating member 25 and the protrusion is better.

[0287] According to some embodiments of the present application, the first insulating body 241 also has a second surface 241b, which is arranged opposite to the first surface 241a along the thickness direction Z of the first insulating member 24. The first protrusion 242 is formed with a recessed portion 2422 at a corresponding position on the second surface 241b, which can reduce the weight of the first insulating member 24.

[0288] According to some embodiments of the present application, the second surface 241b is provided with a positioning portion 244, and the end cover 22 is provided with a positioning hole (not shown) corresponding to the positioning portion 244, and the positioning portion 244 is inserted into the positioning hole.

[0289] Positioning portion 244 is a component provided on second surface 241b for connection and positioning with end cap 22. Positioning portion 244 may protrude from second surface 241b. Positioning portion 244 may be a positioning rod, and the cross-section of the positioning rod may be circular, rectangular, triangular, or a special shape. Optionally, the cross-section of the positioning rod is circular for ease of processing. The shape of the positioning hole corresponds to the cross-section of the positioning rod.

[0290] The first insulating member 24 and the end cover 22 are assembled by inserting the positioning portion 244 into the positioning hole, which has a simple structure and is easy to operate.

[0291] According to some embodiments of the present application, an embodiment of the present application further provides a battery 100, comprising a battery cell 20 as provided in any of the above embodiments.

[0292] According to some embodiments of the present application, an electrical device is further provided, comprising 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.

[0293] The electrical equipment may be any of the above-mentioned devices or systems using the battery cell 20 or the battery 100 .

[0294] According to some embodiments of the present application, referring to Figures 3 to 20 , a battery cell 20 is provided. The battery cell 20 is a rectangular parallelepiped and includes a housing 21 , an end cap 22 , an electrode assembly 23 , a first insulating member 24 , a second insulating member 25 , and an electrode terminal 26 .

[0295] The housing 21 has a first opening 21a and includes two first side walls 211 disposed opposite each other along a first direction X, two second side walls 212 disposed 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 side wall 211 is smaller than that of the second side wall 212.

[0296] The end cover 22 closes the first opening 21 a , and the electrode terminal 26 is disposed on the end cover 22 .

[0297] The electrode assembly 23 is disposed within the housing 21. The electrode assembly 23 has a wound structure, with the winding axis of the electrode assembly 23 extending perpendicularly to the first direction X and parallel to the third direction. A tab of the electrode assembly 23 extends from one end of the electrode assembly 23 along the direction of the winding axis for connection to the electrode terminal 26. The electrode assembly 23 includes a first side surface 23a facing the first sidewall 211.

[0298] The 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 protrusion 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 the first direction X, and the second protrusion 243 is located between the two first protrusions 242 along the first direction X. The first protrusion 242 and the second protrusion 243 abut against the electrode assembly 23.

[0299] The first insulating body 241 is a rectangular plate. The first protrusion 242 and the second protrusion 243 both extend along the second direction Y. The second protrusion 243 is in the length direction of the first insulating body 241 .

[0300] The first protrusion 242 includes a bottom surface 242a and an outer peripheral surface 242b. The bottom surface 242a is configured to abut the electrode assembly 23, while the outer peripheral surface 242b surrounds the bottom surface 242a and connects the bottom surface 242a to the first surface 241a. The first protrusion 242 is provided with a first ventilation channel 2421. The first ventilation channel 2421 is disposed on the outer peripheral surface 242b and extends through the first protrusion 242 along the first direction X. The first protrusion 242 is provided with a plurality of first ventilation channels 2421, which are spaced apart along the second direction Y. The first protrusion 242 includes two third side surfaces 242c oppositely arranged along the first direction X. The first air permeable channel 2421 passes through the two third side surfaces 242c. The flow area of ​​the first air permeable channel 2421 is S1, and the area of ​​the third side surface 242c is S2, satisfying 0.2≤S1 / S2≤0.8.

[0301] The second protrusion 243 is provided with a second air permeable 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 air permeable channels 2431 provided on the second protrusion 243 are the same as the number and structure of the first air permeable channels 2421 provided on the first protrusion 242 .

[0302] The second insulating member 25 wraps the electrode assembly 23 to insulate and isolate the electrode assembly 23 from the housing 21 . The second insulating member 25 is connected to the first protrusion 242 and the second protrusion 243 .

[0303] Along the first direction X, a first gap Q1 is formed between the second insulating member 25 and the first side surface 23a. The first gap Q1 communicates with the first air permeable passage 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 sidewall 211. The second gap Q2 communicates with the first air permeable passage 2421. The second insulating member 25 is provided with a first through-hole 251 or a first notch 252 that avoids the first air permeable passage 2421. 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 also provided with a second through-hole 253 that communicates with the first gap Q1 and the second gap Q2.

[0304] The first surface 241a, the two first protrusions 242, and the 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 air permeable channel 2421 connects the first cavity P and the third gap Q3. The first gap Q1 connects to the third gap Q3, and the second gap Q2 connects to the third gap Q3. The second protrusions 243 divide the first cavity P into a first subcavity P1 and a second subcavity P2. A second air permeable channel 2431 connects the first subcavity P1 and the second subcavity P2.

[0305] In some embodiments, the battery cell 20 further includes a pressure relief mechanism 27 disposed on the end cap 22. Along the third direction, the projection of the second protrusion 243 on the end cap 22 at least partially overlaps with the pressure relief mechanism 27. The second protrusion 243 is hollow. 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 that communicates with the interior of the second protrusion 243. The second vent channel 2431 communicates with the interior of the second protrusion 243. The second surface 241b is provided with a groove 2433 for circumventing the pressure relief mechanism 27. The groove 2433 at least partially overlaps with the third opening 2432. The second protrusion 243 includes two end faces 243a arranged opposite to 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 shell 21. The end face 243a is provided with a third air permeable channel 2434. The second insulating member 25 is provided with a third through hole 254 or a second notch 255 to avoid the third air permeable channel 2434. The third air permeable channel 2434 connects the fourth gap Q4 and the interior of the second protrusion 243.

[0306] 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 side wall 211 along the first direction X. The battery cell 20 further includes a separator 28 disposed between the electrode assembly 23 and the bottom wall 213 to isolate the electrode assembly 23 from the bottom wall 213. The separator 28 is provided with a fourth vent 281, which connects the second gap Q2 with the pressure relief mechanism 27. The fourth vent 281 includes a vent slot 2811 disposed on the side of the separator 28 facing the bottom wall 213.

[0307] In the battery cell 20 of the embodiment of the present application, the first protrusion 242 is provided with a first ventilation channel 2421, and the second protrusion 243 is provided with a second ventilation channel 2431. This reduces the obstruction to gas flow caused by the first protrusion 242 and the second protrusion 243. Because the first gap Q1 is connected to the first ventilation channel 2421, when the battery cell 20 is depressurized, the gas generated by the electrochemical reaction in the electrode assembly 23 can flow through the first gap Q1 toward the first ventilation channel 2421. The gas can quickly pass through the first protrusion 242 and the second protrusion 243, resulting in smooth gas flow, allowing the gas to flow to the pressure relief mechanism 27 in a timely manner, thereby releasing the pressure and improving the reliability of the battery cell 20.

[0308] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery cell, comprising: A housing having a first opening, the housing comprising two first side walls arranged opposite to each other along a first direction; an end cover for closing the first opening; An electrode assembly is disposed in the housing; A first insulating member is disposed between the end cover and the electrode assembly; a second insulating member, wrapping the electrode assembly and at least a portion of the first insulating member, and used for insulating and isolating the electrode assembly from the housing; The first insulating member is provided with a first air permeable channel, the electrode assembly includes a first side surface facing the first side wall, and a first gap is formed between the second insulating member and the first side surface along the first direction, and the first gap is connected to the first air permeable channel.

2. The battery cell according to claim 1, wherein: 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 is protruded from the first surface, the first protrusion is provided with the first air permeable channel, and the first air permeable channel penetrates the first protrusion along the first direction.

3. The battery cell according to claim 2, wherein: Along the first direction, a second gap is formed between the second insulating member and the inner surface of the first side wall, and the second gap is communicated with the first air permeable channel.

4. The battery cell according to claim 3, wherein: The second insulating member is connected to the first protrusion, and the second insulating member does not block the first air permeable channel.

5. The battery cell according to claim 4, wherein: The second insulating member is provided with a first through hole or a first notch avoiding the first air permeable channel.

6. The battery cell according to claim 5, wherein: 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 or 6, wherein: 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, and the second through hole 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 to 7, wherein: The housing further comprises two second side walls arranged opposite to each other along a second direction, the second direction is perpendicular to the first direction, and the area of ​​the first side wall is smaller than the area of ​​the second side wall; The electrode assembly includes two first side surfaces and two second side surfaces, the two first side surfaces are respectively arranged opposite to the first side wall on the same side along the first direction, the two second side surfaces are respectively arranged opposite to the second side wall on the same side along the second direction, and 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 to 7, wherein: The first protrusion extends along a second direction, the second direction is perpendicular to the first direction, and the first air permeable channel penetrates the first protrusion along the first direction.

10. The battery cell according to claim 9, wherein: The first protrusion is provided with a plurality of the first air permeable channels, and the plurality of the first air permeable channels are arranged at intervals along the second direction.

11. The battery cell according to any one of claims 2 to 10, wherein: 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 respectively connect the bottom surface and the first surface, and the first air permeable channel runs through the two third side surfaces.

12. The battery cell according to claim 11, wherein: The first air permeable channel is formed with second openings on the two third side surfaces respectively, the area of ​​the second opening is S1, the area of ​​the third side surface is S2, and 0.2≤S1 / S2≤0.8 is satisfied.

13. The battery cell according to claim 12, wherein: 0.3≤S1 / S2≤0.

7.

14. The battery cell according to any one of claims 2 to 13, wherein: The number of the first protrusions is two, and the two first protrusions are located at two ends of the first insulating body along the first direction.

15. The battery cell according to claim 14, wherein: 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 side wall. The first air permeable channel connects the first cavity and the third gap.

16. The battery cell according to claim 15, wherein: The first gap is in communication with the third gap.

17. The battery cell according to claim 15 or 16, wherein: Along the first direction, a second gap is formed between the second insulating member and the inner surface of the first side wall, and the second gap is communicated with the third gap.

18. The battery cell according to any one of claims 15 to 17, wherein: The first insulating member further includes a second protrusion, which is protruding from the first surface. Along the first direction, the second protrusion is disposed between two of the first protrusions, and the second protrusion divides the first cavity into a first sub-cavity and a second sub-cavity.

19. The battery cell according to claim 18, wherein: The second protrusion includes two fourth side surfaces that are oppositely arranged along the first direction. The second protrusion is provided with a second air permeable channel that runs through the two fourth side surfaces to connect the first sub-cavity with the second sub-cavity.

20. The battery cell according to claim 19, wherein: The second protrusion extends along a second direction, the second direction is perpendicular to the first direction, and the second air permeable channel passes through the second protrusion along the first direction.

21. The battery cell according to claim 20, wherein: The second protrusion is provided with a plurality of the second air permeable channels, and the plurality of the second air permeable channels are arranged at intervals along the second direction.

22. The battery cell according to claim 20 or 21, wherein: The battery cell further includes a pressure relief mechanism, which is disposed on the end cover. Along the third direction, a projection of the second protrusion on the end cover 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, wherein: The second protrusion is a hollow structure, the first insulating body has a second surface facing away from the electrode assembly, and the second surface is provided with a third opening communicating with the interior of the second protrusion.

24. The battery cell according to claim 23, wherein: The second protrusion includes two end faces arranged opposite to each other along the second direction, and along the second direction, there is a fourth gap between the end faces and the inner surface of the shell. The second protrusion is provided with a third air permeable channel, and the third air permeable channel runs through the two end faces, and the third air permeable channel is connected to the fourth gap.

25. The battery cell according to claim 24, wherein: The second insulating member is connected to the second protrusion, and the second insulating member does not block the third air permeable channel.

26. The battery cell according to claim 25, wherein: The second insulating member is provided with a third through hole or a second notch for avoiding the third air permeable passage.

27. The battery cell according to any one of claims 1 to 21, wherein: The housing further comprises a bottom wall and two second side walls arranged opposite to each other along a second direction, the first side wall and the second side wall are connected to the bottom wall, the end cover is arranged opposite to the bottom wall along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other; The battery cell further includes a pressure relief mechanism, and the pressure relief mechanism is arranged on the bottom wall.

28. A battery comprising the battery cell according to any one of claims 1 to 27.

29. An electrical device comprising the battery as claimed in claim 28, wherein the battery is used to provide electrical energy.

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