CN116895905A

CN116895905A - Battery monomer, battery and electric equipment

Info

Publication number: CN116895905A
Application number: CN202311162065.1A
Authority: CN
Inventors: 柯海波; 杨道伟; 李全坤; 金海族; 黄守君; 陈新祥; 王鹏
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-09-11
Filing date: 2023-09-11
Publication date: 2023-10-17

Abstract

The embodiment of the application provides a battery monomer, a battery and electric equipment. The battery cell includes: the electrode assembly comprises a shell, an end cover, an electrode assembly, a first insulating piece and a second insulating piece. The shell is provided with a first opening, and comprises two first side walls which are oppositely arranged along a first direction; the end cap closes the first opening; the electrode assembly is arranged in the shell; the first insulating piece is arranged between the end cover and the electrode assembly; a second insulating member surrounding at least a portion of the electrode assembly and the first insulating member for insulating and isolating the electrode assembly from the case; wherein, first insulating part is provided with first ventilative passageway, and electrode assembly includes the first side that faces first lateral wall, along first direction, is formed with first clearance between second insulating part and the first side, and first clearance and first ventilative passageway intercommunication. The technical scheme of the application can improve the reliability of the battery.

Description

Battery monomer, battery and electric equipment

Technical Field

The application relates to the technical field of batteries, in particular to a battery monomer, a battery and electric equipment.

Background

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

The reliability of the battery is a non-negligible problem in the manufacturing process of the battery. Therefore, how to improve the reliability of the battery is a technical problem to be solved in the battery technology.

Disclosure of Invention

The application provides a battery monomer, a battery and electric equipment, which can improve the reliability of the battery.

The application is realized by the following technical scheme:

in a first aspect, an embodiment of the present application provides a battery cell, including: the electrode assembly comprises a shell, an end cover, an electrode assembly, a first insulating piece and a second insulating piece. The shell is provided with a first opening, and comprises two first side walls which are oppositely arranged along a first direction; the end cap closes the first opening; the electrode assembly is arranged in the shell; the first insulating piece is arranged between the end cover and the electrode assembly; a second insulating member surrounding at least a portion of the electrode assembly and the first insulating member for insulating and isolating the electrode assembly from the case; wherein, first insulating part is provided with first ventilative passageway, and electrode assembly includes the first side that faces first lateral wall, along first direction, is formed with first clearance between second insulating part and the first side, and first clearance and first ventilative passageway intercommunication.

According to the battery cell, the second insulating piece wraps the electrode assembly, gas generated by electrochemical reaction of the electrode assembly cannot penetrate through the second insulating piece, and because the first gap is communicated with the first ventilation channel, when the battery cell is depressurized, the gas generated by electrochemical reaction of the electrode assembly can flow to the space between the electrode assembly and the first insulating piece along the thickness direction of the first insulating piece through the first gap, and can flow rapidly through the first ventilation channel, so that the gas flows smoothly, the blocking of the first insulating piece to the gas flow is reduced, the gas can flow to the pressure release mechanism in time, and the pressure is released in time, so that the battery cell has higher reliability.

According to some embodiments of the application, the first insulating member includes a first insulating body having a first surface facing the electrode assembly, and a first protrusion protruding from the first surface, the first protrusion being provided with a first ventilation channel penetrating the first protrusion in a first direction.

In the above scheme, the first bulge is used for locating the electrode assembly, and the first ventilation channel penetrates through the first bulge, so that the blocking of the first bulge to gas can be reduced.

According to some embodiments of the application, a second gap is formed between the second insulating member and the inner surface of the first sidewall in the first direction, the second gap being in communication with the first ventilation channel.

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 communicated with the first ventilation channel, so that the gas generated by the electrochemical reaction of the electrode assembly moves between the first side wall and the second insulating member, and the gas flows towards the pressure release mechanism in time.

According to some embodiments of the application, a second insulator is coupled to the first protrusion, the second insulator not shielding the first ventilation channel.

In the above-mentioned scheme, the second insulating member does not block the first ventilation channel so as to realize that the second gap communicates with the first ventilation channel.

According to some embodiments of the application, the second insulating member is provided with a first through hole or a first gap that is relieved from the first ventilation channel.

In the scheme, the first through hole or the first notch can avoid the first ventilation channel, the structure is simple, and the processing and the manufacturing are convenient, so that the communication between the second gap and the first ventilation channel is realized.

According to some embodiments of the application, the first gap and the second gap are in communication through a first through hole or a first notch.

In the above scheme, the first gap and the second gap are communicated through the first through hole or the first notch, so that gas generated by electrochemical reaction of the electrode assembly flows towards the first ventilation channel through the first through hole or the first notch, and the gas flows smoothly and timely towards the pressure release mechanism.

According to some embodiments of the application, the second insulating member includes a first insulating portion and a second insulating portion, the first insulating portion corresponds to the first side surface along the first direction, the second insulating portion corresponds to the first insulating member, the first insulating portion is provided with a second through hole, the second through hole communicates with the first gap and the second gap, and the first through hole or the first notch is provided in the second insulating portion.

In the above-described aspect, the first gap and the second gap are communicated through the second through hole so that the gas in the first gap can flow toward the first gas permeation path via the second gap. The first through hole or the first notch located at the second insulating part is combined with the second through hole located at the first insulating part, so that the gas generated by the electrode assembly can flow smoothly, and can flow towards the pressure release mechanism conveniently.

According to some embodiments of the application, the housing further comprises two second side walls arranged opposite to each other along a second direction, the second direction being perpendicular to the first direction, the area of the first side wall being smaller than the area of the second side wall; the electrode assembly comprises two first side surfaces and two second side surfaces, wherein the two first side surfaces are respectively opposite to the first side wall on the same side along the first direction, the two second side surfaces are respectively opposite to the second side wall on the same side along the second direction, and the area of the first side surfaces is smaller than that of the second side surfaces.

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 may be a side wall with a smaller area of the housing; when the electrode assembly is of a winding type structure, the corner area of the electrode assembly is close to the first side wall, more gas can be accumulated in the first gap, the first gap is communicated with the first ventilation channel, so that when the battery unit is subjected to pressure relief, the gas generated by electrochemical reaction of the electrode assembly can quickly pass through the first bulge and timely flow towards the pressure relief mechanism.

According to some embodiments of the application, the first protrusion extends along a second direction, the second direction being perpendicular to the first direction, and the first ventilation channel extends through the first protrusion along the first direction.

In the above scheme, the extending direction of the first protrusion may be a length direction of the first protrusion, the extending direction of the first ventilation channel is perpendicular to the extending direction of the first protrusion, and the extending length of the first ventilation channel is shorter, that is, a path of the gas passing through the first protrusion is shorter, so that the gas is convenient to rapidly pass through the first protrusion, and the smoothness of the gas flowing in the first direction is improved.

According to some embodiments of the application, the first protrusion is provided with a plurality of first ventilation channels, the plurality of first ventilation channels being spaced apart along the second direction.

In the above scheme, a plurality of first ventilation channels are arranged at intervals along the extending direction of the first bulge, so that the first bulge is provided with a plurality of gas flowing positions, the gas can pass through the bulge in the first direction, and the gas passing efficiency is improved.

According to some embodiments of the application, the first protrusion includes a bottom surface and two third side surfaces, the bottom surface is abutted against the electrode assembly, the two third side surfaces are located at two ends of the bottom surface along the first direction, the two third side surfaces are respectively connected with the bottom surface and the first surface, and the first ventilation channel penetrates through the two third side surfaces.

In the above scheme, the first ventilation channels penetrate through the two third side surfaces so as to facilitate the gas to pass through the first protrusions, and the blocking of the gas by the first protrusions is reduced.

According to some embodiments of the application, the first ventilation channels are respectively formed with second openings on two third sides, the area of the second openings is S1, and the area of the third sides is S2, so that 0.2.ltoreq.S1/S2.ltoreq.0.8 is satisfied.

In the above-described aspect, the ratio of the area S1 of the second opening to the area S2 of the third side satisfies the above-described relation (0.2.ltoreq.S1/S2.ltoreq.0.8), the gas can be facilitated to pass through the first projection, and the overall strength of the first projection is high. When the first ventilation channels are plural, S1 is the sum of the areas of the second openings formed on the third side surface of all the first ventilation channels.

According to some embodiments of the application, 0.3.ltoreq.S1/S2.ltoreq.0.7.

In the above-described aspect, when the ratio of the area S1 of the second opening to the area S2 of the third side surface satisfies 0.3.ltoreq.s1/s2.ltoreq.0.7, the gas can more easily pass through the first projection, and the first projection also has higher strength.

According to some embodiments of the application, the number of first protrusions is two, the two first protrusions being located at both ends of the first insulating body in the first direction.

In the above scheme, the number of the first protrusions is two, and the first protrusions are located at two ends of the first insulating body along the first direction, so that the electrode assembly is positioned at two positions along the first direction, and a good positioning effect is achieved.

According to some embodiments of the application, the first surface, the two first protrusions and the electrode assembly enclose a first cavity, a third gap is formed between the first protrusions and the inner surface of the first sidewall along the first direction, and the first ventilation channel communicates with the first cavity and the third gap.

In the above scheme, the first ventilation channel is communicated with the first cavity and the third gap so as to facilitate the circulation of the gas at the two sides of the first bulge in the first direction and reduce the blocking of the first bulge on the gas flow.

According to some embodiments of the application, the first gap communicates with the third gap.

In the above arrangement, the first gap communicates with the third gap so that the gas in the first gap flows toward the third gap.

According to some embodiments of the application, a second gap is formed between the second insulator and the inner surface of the first sidewall along the first direction, the second gap being in communication with the third gap.

In the above arrangement, the second gap communicates with the third gap to facilitate gas flow between the second gap and the third gap.

According to some embodiments of the application, the first insulating member further comprises a second protrusion protruding from the first surface, the second protrusion being arranged between two first protrusions along the first direction, the second protrusion dividing the first cavity into a first subchamber and a second subchamber.

In the above aspect, the second protrusions are disposed between the two first protrusions along the first direction to increase the positioning effect of the first insulating member on the electrode assembly.

According to some embodiments of the application, the second protrusion comprises two fourth sides arranged opposite in the first direction, the second protrusion being provided with a second ventilation channel extending through the two fourth sides for communicating the first subchamber with the second subchamber.

In the above scheme, the second protrusion is provided with a second ventilation channel, and the second ventilation channel is communicated with the first subchamber and the second subchamber, so that gas flows between the first subchamber and the second subchamber.

According to some embodiments of the application, the second protrusion extends along a second direction, the second direction being perpendicular to the first direction, and the second ventilation channel extends through the second protrusion along the first direction.

In the above scheme, the extending direction of the second protrusion may be the length direction of the second protrusion, the extending direction of the second ventilation channel is perpendicular to the extending direction of the second protrusion, and the extending length of the second ventilation channel is shorter, that is, the path of the gas passing through the second protrusion is shorter, so that the gas is convenient to rapidly pass through the second protrusion, and the flow smoothness of the gas in the first direction is improved.

According to some embodiments of the application, the second protrusion is provided with a plurality of second ventilation channels, the plurality of second ventilation channels being spaced apart along the second direction.

In the above scheme, a plurality of second ventilation channels are arranged at intervals along the extending direction of the second protrusions, so that the second protrusions are provided with a plurality of gas circulation positions, the gas can pass through the second protrusions in the first direction, and the gas passing efficiency is improved.

According to some embodiments of the application, the battery cell further comprises a pressure relief mechanism, the pressure relief mechanism is arranged on the end cover, and the projection of the second protrusion on the end cover along the third direction is at least partially overlapped with the pressure relief mechanism, and the first direction, the second direction and the third direction are perpendicular to each other.

In the above scheme, the pressure release mechanism is arranged on the end cover, so that when the pressure release mechanism releases the internal pressure of the battery cell, the gas generated by the electrochemical reaction of the electrode assembly can rapidly flow towards the pressure release mechanism.

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

In the scheme, the second bulge is of a hollow structure, and the inside of the second bulge can collect gas, so that gas circulation is facilitated; the gas in the second bulge can flow towards the third opening, so that the gas in the second bulge can be discharged conveniently, and the pressure relief mechanism can release pressure conveniently.

According to some embodiments of the application, the second protrusion comprises two end surfaces arranged opposite to each other in the second direction, a fourth gap is provided between the end surfaces and the inner surface of the housing in the second direction, the second protrusion is provided with a third ventilation channel, the third ventilation channel penetrates through the two end surfaces, and the third ventilation channel is communicated with the fourth gap.

In the above scheme, the third ventilation channel penetrates through the two end faces, and the third ventilation channel is communicated with the fourth gap so that gas can flow between the inside of the second protrusion and the fourth gap.

According to some embodiments of the application, the second insulator is connected to the second protrusion, the second insulator not blocking the third ventilation channel.

In the above-described aspect, the second insulating member does not block the third ventilation passage so as to achieve communication of the fourth gap with the point ventilation passage.

According to some embodiments of the application, the second insulating member is provided with a third through hole or a second gap that bypasses the third ventilation channel.

In the above scheme, the third through hole is arranged, so that on one hand, the fourth gap is convenient to communicate with the third ventilation channel, and on the other hand, the second insulating piece and the second bulge can have larger connection area; the second notch is formed at the edge of the second insulating piece, so that the processing and the manufacturing are facilitated.

According to some embodiments of the application, 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 walls 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 comprises a pressure relief mechanism, and the pressure relief mechanism is arranged on the bottom wall.

In the above scheme, the pressure release mechanism is arranged on the bottom wall, and the electrode terminal can be arranged on the end cover, so that the pollution of excrement discharged by the pressure release mechanism to the electrode terminal is reduced.

In a second aspect, an embodiment of the present application further provides a battery, including a battery cell provided in any one of the embodiments above.

In a third aspect, an embodiment of the present application further provides an electrical device, including a battery unit or a battery provided in any one of the foregoing embodiments, where the battery unit or the battery is used to provide electrical energy.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;

Fig. 2 is an exploded view of a battery provided in some embodiments of the present application;

fig. 3 is an exploded view of a battery cell according to some embodiments of the present application;

FIG. 4 is a schematic view of a first insulating member according to some embodiments of the present application;

fig. 5 is a schematic structural diagram of a first insulating body according to some embodiments of the present application;

fig. 6 is a cross-sectional view of a battery cell provided in some embodiments of the application;

FIG. 7 is an enlarged view of a portion of FIG. 6 at A;

fig. 8 is a sectional view illustrating a partial structure of a battery cell according to some embodiments of the present application;

fig. 9 is a schematic structural view of a second insulating member provided with a first through hole according to some embodiments of the present application;

FIG. 10 is a schematic diagram illustrating a structure of a second insulating member with a first notch according to some embodiments of the present application;

fig. 11 is a sectional view illustrating a partial structure of a battery cell according to other embodiments of the present application;

fig. 12 is a schematic structural view of a battery cell according to other embodiments of the present application;

fig. 13 is a cross-sectional view of a battery cell according to still other embodiments of the present application;

FIG. 14 is a schematic view of a second protrusion according to some embodiments of the present application;

fig. 15 is a cross-sectional view of a battery cell according to still other embodiments of the present application;

FIG. 16 is a schematic diagram illustrating an assembly of a second insulating member and a second protrusion according to some embodiments of the present application;

FIG. 17 is an enlarged view of a portion of FIG. 16 at B;

fig. 18 is a schematic structural diagram of a pressure release mechanism provided in some embodiments of the present application disposed on a bottom wall;

fig. 19 is an exploded view of a battery cell according to other embodiments of the present application;

fig. 20 is a cross-sectional view of a battery cell according to still other embodiments of the present application.

Icon: 100-cell; 10-a box body; 11-a first sub-tank; 12-a second sub-tank; 20-battery cells; 21-a housing; 21 a-a first opening; 211-a first sidewall; 212-a second sidewall; 213-a bottom wall; 22-end caps; 23-an electrode assembly; 23 a-a first side; 23 b-a first end face; 23 c-a second side; 231-tab; 232-a body portion; 24-a first insulating member; 241-a first insulating body; 241 a-a first surface; 241 b-a second surface; 242-first protrusions; 242 a-bottom surface; 242 b-an outer peripheral surface; 242 c-a third side; 2421-a first vent passage; 2421 a-a second opening; 2422-a depression; 243-second protrusions; 243 a-end face; 243 b-fourth side; 2431-a second ventilation channel; 2432-a third opening; 2433-groove; 2434-a third ventilation channel; 244-positioning part; 25-a second insulator; 25 a-a first insulating portion; 25 b-a second insulating portion; 251-first through holes; 252-first gap; 253-a second through hole; 254-a third via; 255-a second gap; 26-electrode terminals; 27-a pressure release mechanism; 28-spacers; 281-fourth ventilation passage; 2811-an exhaust groove; 29-an adapter; 200-a controller; 300-motor; 1000-vehicle; q1-a first gap; q2-a second gap; q3-a third gap; q4-fourth gap; p-a first cavity; p1-a first subchamber; p2-a second subchamber; x-a first direction; y-a second direction; z-thickness direction of the first insulating member.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means 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 appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the described embodiments of the application may be combined with other embodiments.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

The term "plurality" as used herein means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

In some embodiments, the battery may be a battery module, and when there are a plurality of battery cells, the plurality of battery cells are arranged and fixed to form one battery module.

In some embodiments, the battery may be a battery pack including a case and a battery cell, the battery cell or battery module being housed in the case.

In some embodiments, the tank may be part of the chassis structure of the vehicle. For example, a portion of the tank may become at least a portion of the floor of the vehicle, or a portion of the tank may become at least a portion of the cross member and the side member of the vehicle.

In some embodiments, the battery may be an energy storage device. The energy storage device comprises an energy storage container, an energy storage electric cabinet and the like.

In the embodiment of the application, the battery cell can be a secondary battery, and the secondary battery refers to a battery cell which can activate the active material in a charging mode to continue to use after the battery cell discharges.

The battery cell may be, but is not limited to, a lithium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, and the like.

The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge of the battery cell, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode. The isolating part is arranged between the positive electrode and the negative electrode, can play a role in preventing the positive electrode and the negative electrode from being short-circuited, and can enable active ions to pass through.

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.

As an example, the positive electrode current collector has two surfaces opposing in its own thickness direction, and the positive electrode active material is provided on either or both of the two surfaces opposing the positive electrode current collector.

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

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 a battery positive electrode active material may be used.

In some embodiments, the negative electrode may be a negative electrode tab, which may include a negative electrode current collector.

As an example, the negative electrode current collector may employ a metal foil or a composite current collector. For example, as the metal foil, surface-silver-treated aluminum, surface-silver-treated stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, or the like can be used.

In some embodiments, the anode current collector has two surfaces opposing in a thickness direction thereof, and the anode active material is provided on either or both of the two surfaces opposing the anode current collector.

As an example, a negative electrode active material for a battery known in the art may be used. As an example, the anode 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, and the like. The silicon-based material may be at least one selected from elemental silicon, silicon oxygen compounds, silicon carbon composites, silicon nitrogen composites, and silicon alloys. The tin-based material may be at least one selected from elemental tin, tin oxide, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery anode active material may be used. These negative electrode active materials may be used alone or in combination of two or more.

In some embodiments, the isolation component is an isolation membrane. The type of the separator is not particularly limited, and any known porous separator having good chemical stability and mechanical stability can be used.

As an example, the main material of the separator may be at least one selected from glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator may be a single-layer film or a multilayer composite film, and is not particularly limited. When the separator is a multilayer composite film, the materials of the respective layers may be the same or different, and are not particularly limited. The separator may be a single member located between the positive and negative electrodes or may be attached to the surfaces of the positive and negative electrodes.

In some embodiments, the separator component is a solid state electrolyte. The solid electrolyte is arranged between the anode and the cathode and plays roles in transmitting ions and isolating the anode and the cathode.

In some embodiments, the electrode assembly is a rolled structure. The positive plate and the negative plate are wound into a winding structure.

In some embodiments, the electrode assembly is a lamination stack.

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

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

In some embodiments, at least one electrode terminal is provided on the case, and the electrode terminal is electrically connected with the tab of the electrode assembly. The electrode terminal may be directly connected to the tab, or may be indirectly connected to the tab through the adapter. The electrode terminal may be provided on the terminal cover or may be provided on the case.

In some embodiments, an explosion proof valve is provided on the housing. The explosion-proof valve is used for discharging the internal pressure of the battery cell.

As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shaped battery cell, and the prismatic battery cell includes a square-case battery cell, a blade-shaped battery cell, a polygonal-prismatic battery cell, such as a hexagonal-prismatic battery cell, etc., and embodiments of the present application are not particularly limited.

The battery cell also comprises a pressure relief mechanism which can be arranged on the end cover and also can be arranged on the shell to relieve the internal pressure or temperature of the battery cell.

The development of battery technology is taking into consideration various design factors such as energy density, discharge capacity, charge-discharge rate and other performance parameters, and the reliability of the battery.

The battery cell comprises a shell, an end cover, an electrode assembly, a first insulating piece and a second insulating piece, wherein the end cover seals an opening of the shell, the electrode assembly is arranged in the shell, and the first insulating piece is arranged between the end cover and the electrode assembly. The first insulating piece is abutted against the electrode assembly so as to realize positioning of the electrode assembly. The second insulating member surrounds at least a portion of the electrode assembly and the first insulating member to insulate the electrode assembly from the case. When the battery monomer is depressurized, because the gas can not penetrate through the second insulating part and the first insulating part is blocked, the electrode assembly can not flow towards the pressure release mechanism in time because of the gas generated by electrochemical reaction, so that the pressure release of the battery monomer is not smooth, the gas generated in the region with larger gas yield can not flow to the pressure release mechanism for discharge, and the gas in the region can not flow to the shell nearby, so that the welding seam of the shell and the end cover is split, the risks such as fire, explosion and the like are caused, and the reliability of the battery monomer is lower.

In view of this, in order to improve the reliability of the battery cell, the embodiment of the application provides a battery cell, wherein the first insulating member is arranged between the end cover and the electrode assembly, the first insulating member is provided with a first ventilation channel, a first gap is formed between a first side surface of the electrode assembly facing the first side wall and the second insulating member along the first direction, and the first gap is communicated with the first ventilation channel, so that when the battery cell is depressurized, the gas generated by the electrochemical reaction of the electrode assembly can flow rapidly, the blocking of the first insulating member to the gas flow is reduced, and the gas flows to the pressure release mechanism in time, so that the battery cell has higher reliability.

In such battery cell, first insulating part is provided with first ventilative passageway, the insulating isolation electrode assembly of second insulating part and casing, gas can't pierce through the second insulating part, because first clearance and first ventilative passageway intercommunication, when the battery cell pressure release, the space between electrode assembly along the thickness direction of first insulating part and the first insulating part is flowed to the gas that electrode assembly produced via first clearance to can flow fast via first ventilative passageway, the gas flow is smooth and easy, reduce the first insulating part to the blocking of gas flow, so that gas can flow to pressure release mechanism in time, and in time pressure release, make the battery cell have higher reliability.

The battery disclosed by the embodiment of the application can be used in electric equipment such as vehicles, ships or aircrafts, but is not limited to the electric equipment. The power supply system with the electric equipment can be composed of the battery monomer, the battery and the like.

The embodiment of the application provides electric equipment using a battery monomer as a power supply, wherein the electric equipment can be, but is not limited to, a mobile phone, a tablet personal computer, a notebook computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric automobile, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiments take a powered device according to an embodiment of the present application as an example of the vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle according to some embodiments of the application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The battery 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. Battery 100 may be used to power vehicle 1000, for example, battery 100 may be used as an operating power source for vehicle 1000, for the circuitry of vehicle 1000, such as for the operational power requirements of vehicle 1000 during start-up, navigation, and operation.

The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some embodiments of the present application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.

Referring to fig. 2, fig. 2 is an exploded view of a battery according to some embodiments of the present application. The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The case 10 is used to provide an accommodating space for the battery cell 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first sub-case 11 and a second sub-case 12, the first sub-case 11 and the second sub-case 12 being covered with each other, the first sub-case 11 and the second sub-case 12 together defining an accommodating space for accommodating the battery cell 20. The second sub-box 12 may have a hollow structure with an opening at one end, the first sub-box 11 may have a plate-shaped structure, and the first sub-box 11 covers the opening side of the second sub-box 12, so that the first sub-box 11 and the second sub-box 12 together define an accommodating space; the first sub-tank 11 and the second sub-tank 12 may be hollow structures each having one side opened, and the opening side of the first sub-tank 11 may be closed to the opening side of the second sub-tank 12.

In the battery 100, the plurality of battery cells 20 may be connected in series, parallel or a series-parallel connection, wherein the series-parallel connection refers to that the plurality of battery cells 20 are connected in series or parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting a plurality of battery cells 20 in series or parallel or series-parallel connection, and a plurality of battery modules are then connected in series or parallel or series-parallel connection to form a whole and are accommodated in the case 10. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for making electrical connection between the plurality of battery cells 20.

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.

Referring to fig. 3 to 7, fig. 3 is an exploded view of a battery cell according to some embodiments of the present application, fig. 4 is a schematic structural view of a first insulating member according to some embodiments of the present application, fig. 5 is a schematic structural view of a first insulating body according to some embodiments of the present application, fig. 6 is a cross-sectional view of a battery cell according to some embodiments of the present application, and fig. 7 is a partially enlarged view at a of fig. 6. According to some embodiments of the present application, a battery cell 20 is provided, the battery cell 20 including a case 21, an end cap 22, an electrode assembly 23, a first insulating member 24, and a second insulating member 25. The housing 21 has a first opening 21a, and the housing 21 includes two first side walls 211 disposed opposite in the first direction X; the end cap 22 closes the first opening 21a; the electrode assembly 23 is disposed within the case 21; the first insulating member 24 is disposed between the end cap 22 and the electrode assembly 23; the second insulating member 25 surrounds at least a portion of the electrode assembly 23 and the first insulating member 24 for insulating and isolating the electrode assembly 23 from the case 21; wherein the first insulating member 24 is provided with a first ventilation channel 2421, 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 in the first direction X, the first gap Q1 being in communication with the first ventilation channel 2421.

In the drawing, the direction indicated by the letter X may be a first direction, and the direction indicated by the letter Z may be a 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.

The case 21 is an assembly for mating with the end cap 22 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to house the electrode assembly 23, electrolyte, and other components. The housing 21 and the end cap 22 may be separate components. The housing 21 may be of various shapes and sizes. Specifically, the shape of the case 21 may be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 21 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

The housing 21 may have one first opening 21a or may have two first openings 21a. When the housing 21 has two first openings 21a, the number of the end caps 22 is two, the two end caps 22 are disposed opposite to each other, and the two first openings 21a are closed, respectively.

The first side walls 211 are wall portions of the housing 21 located in the first direction X, and the two first side walls 211 are located at both ends of the housing 21 in the first direction X, respectively. The first sidewall 211 constitutes an accommodating space with other wall portions of the case 21 to accommodate the electrode assembly 23. The first side wall 211 may be a wall portion of the case 21 having a small area, for example, the first side wall 211 may be a side wall of the case 21 in the length direction of the battery cell 20.

The end cap 22 refers to a member that is covered at the first opening 21a of the case 21 to isolate the inner environment of the battery cell 20 from the outer environment. Without limitation, the shape of the end cap 22 may be adapted to the shape of the housing 21 to fit the housing 21. Alternatively, the end cap 22 may be made of a material having a certain hardness and strength (such as an aluminum alloy), so that the end cap 22 is not easy to deform when being extruded and collided, so that the battery cell 20 can have a higher structural strength, and the reliability can be improved. The end cap 22 may be provided with functional components such as electrode terminals 26. The electrode terminals 26 may be used to be electrically connected with the electrode assembly 23 for outputting or inputting electric power of the battery cell 20. The material of the end cap 22 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application is not limited thereto.

The electrode assembly 23 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 23 may be contained within the case 21. The electrode assembly 23 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally disposed between the positive electrode sheet and the negative electrode sheet, and is used for separating the positive electrode sheet and the negative electrode sheet so as to avoid an internal short circuit between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode sheets having active material constitute the main body portion of the electrode assembly 23, and the portions of the positive and negative electrode sheets having no active material constitute the tabs 231, respectively. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or located at two ends of the main body portion respectively. During charge and discharge of the battery 100, the positive and negative electrode active materials react with the electrolyte, and the tab 231 is connected to the electrode terminal 26 to form a current loop.

The battery cell 20 further includes an adapter 29, and the tab 231 and the electrode terminal 26 are electrically connected through the adapter 29.

The first insulating member 24 is disposed at a side of the end cap 22 facing the electrode assembly 23, and the first insulating member 24 is connected to the end cap 22 and located between the end cap 22 and the electrode assembly 23. The first insulating member 24 may be used to isolate electrical connection components within the housing 21 from the end cap 22 to reduce the risk of shorting. By way of example, the first insulating member 24 may be plastic, rubber, or the like.

The second insulating member 25 is a member having an electrical insulating function, and the second insulating member 25 surrounds at least a portion of the electrode assembly 23 and the first insulating member 24 to insulate the electrode assembly 23 from the case 21. The second insulating member 25 may also be a film-like structure, such as a mylar film.

One end of the second insulating member 25 extends beyond the electrode assembly 23 in the thickness direction Z of the first insulating member 24, and extends to the first insulating member 24. The second insulating member 25 may be disposed around the first insulating member 24, and the second insulating member 25 may be connected to the first insulating member 24 or disconnected from the first insulating member 24.

The first side 23a is a surface of the electrode assembly 23 facing the first side wall 211. The second insulating member 25 forms a first gap Q1 between the first side 23a and the first direction X, and when the electrode assembly 23 generates gas due to an electrochemical reaction, the gas can accumulate in the first gap Q1 and flow toward a region of the second insulating member 25 not covering the electrode assembly 23.

The first gap Q1 communicates with the first gas-permeable channel 2421 to enable the gas within the first gap Q1 to flow toward the first gas-permeable channel 2421 to reduce the resistance of the first insulator 24 to the flow of gas.

The battery cell 20 may further include a pressure relief mechanism 27, where the pressure relief mechanism 27 may be disposed on the end cap 22 or on the housing 21 to relieve the internal pressure or temperature of the battery cell 20.

The pressure release mechanism 27 refers to an element or component that is actuated to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a predetermined threshold. The pressure release mechanism 27 may take the form of, for example, an explosion-proof valve, a gas valve, a pressure release valve, or a safety valve, and may specifically take the form of a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold, the pressure release mechanism 27 performs an action or a weak structure provided in the pressure release mechanism 27 is broken, thereby forming an opening or passage through which the internal pressure or temperature can be released.

The term "actuated" as used herein refers to the pressure relief mechanism 27 being actuated or activated to a state such that the internal pressure and temperature of the battery cell 20 is relieved. The action by pressure relief mechanism 27 may include, but is not limited to: at least a portion of the pressure relief mechanism 27 breaks, tears, opens, etc. Upon actuation of the pressure release mechanism 27, high temperature, high pressure substances (e.g., gases) within the battery cell 20 may be expelled as emissions from the location of actuation. In this way, the pressure and temperature of the battery cells 20 can be relieved under controlled pressure or temperature conditions, thereby avoiding potentially more serious accidents.

According to the battery cell 20 of the embodiment of the application, the second insulating member 25 wraps at least a part of the electrode assembly 23 and the first insulating member 24, the gas generated by the electrochemical reaction of the electrode assembly 23 cannot penetrate the second insulating member 25, and because the first gap Q1 is communicated with the first ventilation channel 2421, when the pressure release mechanism 27 of the battery cell 20 releases pressure, the gas generated by the electrochemical reaction of the electrode assembly 23 can flow 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 via the first gap Q1, and can flow rapidly via the first ventilation channel 2421, the gas flow is smooth, the blocking of the gas flow by the first insulating member 24 is reduced, so that the gas can flow to the pressure release mechanism 27 in time, and the pressure release is performed in time, so that the battery cell 20 has higher reliability.

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 having a first surface 241a facing the electrode assembly 23, the first protrusion 242 protruding from the first surface 241a, the first protrusion 242 being provided with a first ventilation channel 2421, the first ventilation channel 2421 penetrating the first protrusion 242 in the first direction X.

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

The first insulating body 241 may have a plate-like structure.

The first protrusion 242 is protruding from the first surface 241a, and the first protrusion 242 may be separately disposed from the first insulating body 241, where the first protrusion 242 is connected to the first surface 241a; alternatively, the first protrusion 242 may be integrally formed with the first insulating body 241, and the first protrusion 242 may protrude from the first surface 241a.

The number of the first protrusions 242 may be one or two. When the number of the first protrusions 242 is two, the two first protrusions 242 may be disposed corresponding to the two first sidewalls 211, respectively. In some embodiments, when the battery cell 20 is depressurized, the gas generated by the electrochemical reaction of the electrode assembly 23 flows 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 through the first gap Q1, can quickly pass through the first protrusion 242, and flows to the pressure release mechanism 27 in time.

The first protrusion 242 is a portion of the first insulating member 24 for abutting against the electrode assembly 23. The abutment means that the first protrusion 242 is in contact with the electrode assembly 23, and may be a force acting to interact between the first protrusion 242 and the electrode assembly 23. The first protrusion 242 may directly abut against the electrode assembly 23, or may indirectly abut against the electrode assembly 23 through other members. After the battery cell 20 is assembled, the first protrusion 242 contacts the electrode assembly 23, and the first protrusion 242 can restrict the electrode assembly 23 from moving toward the end wall.

The first air-permeable channel 2421 is a hole penetrating the first protrusion 242 in a direction intersecting the thickness direction Z of the first insulating member 24, and the extending direction of the first air-permeable channel 2421 may be parallel to the first surface 241a or may intersect the first surface 241 a.

In some embodiments, referring to fig. 3, the 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 the tab 231 is electrically connected to the electrode terminal 26. The first side 23a may be a surface of the main body 232 facing the first side wall 211. The first protrusion 242 contacts the first end surface 23b, and a portion of the tab 231 is located in a space between the first end surface 23b and the end cap 22. The number of the electrode terminals 26 is two, namely a positive electrode terminal and a negative electrode terminal, and the positive electrode terminal and the negative electrode terminal are respectively arranged on the end covers; the number of the tabs 231 is two, namely a positive electrode tab and a negative electrode tab, the positive electrode tab is electrically connected with a positive electrode terminal, and the negative electrode tab is electrically connected with a negative electrode terminal.

Alternatively, the second insulating member 25 exceeds the first end face 23b in the thickness direction Z of the first insulating member 24.

In the above-described aspects, the first protrusions 242 are used to position the electrode assembly 23, and the first ventilation channels 2421 penetrate the first protrusions 242, so that the blocking of the gas by the first protrusions 242 can be reduced.

Referring to fig. 8, fig. 8 is a cross-sectional view illustrating a partial structure of a battery cell according to some 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 sidewall 211 along the first direction X, and the second gap Q2 communicates with the first ventilation channel 2421.

The second gap Q2 is a space between the second insulator 25 and the inner surface of the first sidewall 211 along the first direction X.

In some embodiments, when the pressure relief mechanism 27 is provided to the case 21, the gas generated by the electrochemical reaction of the electrode assembly 23 can flow through the first protrusion 242 toward the second gap Q2 to flow toward the pressure relief mechanism 27.

In some embodiments, the second insulating member 25 may be provided with a hole communicating the first gap Q1 and the second gap Q2, through which gas can enter the second gap Q2, and the gas in the second gap Q2 flows toward the first gas-permeable passage 2421 to quickly flow toward the pressure release mechanism 27.

In the above-described aspect, the second gap Q2 is formed between the second insulating member 25 and the inner surface of the first sidewall 211, and the second gap Q2 communicates with the first ventilation channel 2421, so that the gas generated by the electrode assembly 23 due to the electrochemical reaction moves between the first sidewall 211 and the second insulating member 25, thereby allowing the gas to flow toward the pressure relief mechanism 27 in time.

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 ventilation channel 2421.

One end of the second insulating member 25 may be connected to the first protrusion 242, and the connection manner between the second insulating member 25 and the first protrusion 242 may be various, for example, the second insulating member 25 and the first protrusion 242 may be bonded or may be a heat-fusible connection.

The second insulating member 25 may not block the first gas-permeable channel 2421 in various manners, for example, the second insulating member 25 may not extend to the first gas-permeable channel 2421 in the thickness direction Z of the first insulating member 24, or the second insulating member 25 may be provided with a through hole or a notch for the gas in the second gap Q2 to flow toward the first gas-permeable channel 2421.

In the above-described aspect, the second insulating member 25 does not block the first air-permeable channel 2421 so as to achieve the communication of the second gap Q2 with the first air-permeable channel 2421.

Referring to fig. 8, and further referring to fig. 9 and fig. 10, fig. 9 is a schematic structural diagram of a second insulating member provided with a first through hole according to some embodiments of the present application, and fig. 10 is a schematic structural diagram of a 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 is provided to avoid the first ventilation channel 2421.

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

In some embodiments, the first notch 252 is disposed at an edge of the second insulating member 25, so that the first ventilation channel 2421 is exposed at the first notch 252 after the second insulating member 25 is connected with the first insulating member 24.

In the above-mentioned scheme, the first through hole 251 or the first notch 252 can avoid the first ventilation channel 2421, and the structure is simple, and the processing and manufacturing are convenient, so as to realize the communication between the second gap Q2 and the first ventilation channel 2421.

Referring to fig. 8, according to some embodiments of the present application, the first gap Q1 and the second gap Q2 are communicated through the first through hole 251 or the first notch 252.

The first through hole 251 or the first gap 252 can communicate with the first gap Q1 and the second gap Q2, and since the second gap Q2 communicates with the first gas-permeable channel 2421, the gas generated by the electrochemical reaction of the electrode assembly 23 can flow from the first gap Q1 to the second gap Q2 and the first gas-permeable channel 2421 through the first through hole 251 or the first gap 252, so that the gas flows smoothly and timely toward the pressure relief mechanism 27.

Referring to fig. 11, fig. 11 is a cross-sectional view illustrating a partial structure of a battery cell according to 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, the first insulating portion 25a corresponds to the first side surface along the first direction X, 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, the second through hole 253 communicates with the first gap Q1 and the second gap Q2, and the first through hole 251 or the first notch 252 is provided at the second insulating portion 25b.

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

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

Alternatively, the second insulating part 25b may be located at a side of the first insulating body 241 facing the electrode assembly 23, for example, in the first direction X, and the second insulating part 25b may correspond to the first protrusion 242 of the first insulating member 24.

The second through hole 253 is a hole provided in the first insulating portion 25a, and can communicate the first gap Q1 and the second gap Q2.

The number of the second through holes 253 may be plural, and the plural second through holes 253 are arranged at intervals so that the gas flows from the first gap Q1 to the second gap Q2. The shape of the second through hole 253 may be various, for example, circular, square, or irregular.

In the above-described aspect, the first gap Q1 and the second gap Q2 are communicated through the second through hole 253 so that the gas in the first gap Q1 can flow toward the first gas-permeable channel 2421 via the second gap Q2. The first through hole 251 or the first notch 252 located at the second insulating portion 25b, in cooperation with the second through hole 253 located at the first insulating portion 25a, can facilitate the smooth flow of the gas generated by the electrode assembly 23, so as to facilitate the flow toward the pressure release mechanism 27.

Referring to fig. 3, according to some embodiments of the application, the housing 21 further includes two second sidewalls 212 disposed opposite to each other along a second direction Y, the second direction Y is perpendicular to the first direction X, and an area of the first sidewall 211 is smaller than an area of the second sidewall 212. The electrode assembly 23 includes two first side surfaces 23a and two second side surfaces 23c, the two first side surfaces 23a are disposed opposite to the first side wall 211 of the same side in the first direction X, and the two second side surfaces 23c are disposed opposite to the second side wall 212 of the same side in the second direction Y, respectively, and the area of the first side surfaces 23a is smaller than that of the second side surfaces 23 c.

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

The second side walls 212 are wall portions of the housing 21 in the second direction Y, and the two second side walls 212 are respectively located at both ends of the housing 21 in the second direction Y. The first side wall 211 is connected at both ends thereof in the second direction Y to two second side walls 212, respectively, and the two first side walls 211 and the two second side walls 212 enclose a space accommodating the electrode assembly 23.

The two second side walls 212 and the two first side walls 211 may enclose a space accommodating the electrode assembly 23. At this time, the case 21 may have a rectangular parallelepiped shape.

The dimension of the first sidewall 211 in the thickness direction Z of the first insulating member 24 may 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 may be the area of the first sidewall 211 on a plane formed by the second direction Y and the thickness direction Z of the first insulating member 24, and the area of the second sidewall 212 may be the area of the second sidewall 212 on a plane formed by the first direction X and the thickness direction Z of the first insulating member 24. The area of the first sidewall 211 is smaller than the area of the second sidewall 212, i.e. 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 may be a length direction of the battery cell 20, and the second direction Y may be a thickness direction of the battery cell 20. The first sidewall 211 may be referred to as a narrow wall and the second sidewall 212 may be referred to as a wide wall. The first sidewall 211 may correspond to a side of the electrode assembly 23 having a smaller area, and the second sidewall 212 may correspond to a side of the electrode assembly 23 having a larger area.

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

In the embodiment in which the electrode assembly 23 includes the body portion 232 and the tab 231, the first side 23a and the second side 23c are both faces of the body portion 232, the first side 23a is connected to the first end face 23b, and the second side 23c is connected to the first end face 23b. The first side 23a is a side of the electrode assembly 23 having a smaller area, and the first side 23a may be referred to as a narrow side; the second side 23c is a side of the electrode assembly 23 having a larger area, and the second side 23c may be referred to as a broad side.

When the electrode assembly 23 is of a roll-to-roll structure, the gap between the electrode assembly 23 and the case 21 is small in the second direction Y, so that the gap between the second insulator 25 and the electrode assembly 23 is small, and gas is not easily accumulated in this gap. In the first direction X, that is, the end of the battery cell 20 in the longitudinal direction, the gap between the electrode assembly 23 and the case 21 is large, and gas generated from the electrochemical reaction of the electrode assembly 23 is easily accumulated in the gap. During operation of the battery cell 20, the electrode assembly 23 is easily expanded and deformed in the first direction X, so that a large amount of gas is accumulated in the first gap Q1, and most of the gas generated by the electrochemical reaction of the electrode assembly 23 is discharged through the first gap Q1.

In the above-described aspect, the area of the first sidewall 211 is smaller than the area of the second sidewall 212, and the first sidewall 211 may be a sidewall of the housing 21 having a smaller area. When the electrode assembly 23 is in a winding structure, the corner area of the electrode assembly 23 is close to the first sidewall 211, more gas can be accumulated in the first gap Q1 when the electrode assembly 23 generates gas due to the electrochemical reaction, and the first gap Q1 is communicated with the first ventilation channel 2421, so that when the battery cell 20 is depressurized, the gas generated by the electrode assembly 23 due to the electrochemical reaction can quickly pass through the first protrusion 242 and timely flow towards the pressure release mechanism 27.

Referring to fig. 4 and 5, according to some embodiments of the application, the first protrusions 242 extend along a second direction Y, the second direction Y is perpendicular to the first direction X, and the first ventilation channels 2421 penetrate the first protrusions 242 along the first direction X.

The extending direction of the first protrusion 242 may be the length direction of the first protrusion 242, the extending direction of the first ventilation channel 2421 is perpendicular to the extending direction of the first protrusion 242, and the extending length of the first ventilation channel 2421 is shorter, that is, the path of the gas passing through the first protrusion 242 is shorter, so that the gas can pass through the first protrusion 242 quickly, and the smoothness of the gas flowing in the first direction X is improved.

Referring to fig. 4 and 5, according to some embodiments of the application, the first protrusions 242 are provided with a plurality of first ventilation channels 2421, and the plurality of first ventilation channels 2421 are spaced apart along the second direction Y.

The plurality of first ventilation channels 2421 are spaced apart in the second direction Y, in other words, the plurality of first ventilation channels 2421 are spaced apart in the extending direction of the first protrusions 242. The plurality of first ventilation channels 2421 may be positioned on a straight line parallel to the second direction Y, or the plurality of first ventilation channels 2421 may be disposed in a dispersed manner.

In the above-mentioned scheme, the plurality of first ventilation channels 2421 are arranged at intervals along the extending direction of the first protrusion 242, so that the first protrusion 242 has a plurality of positions for gas to flow, which is beneficial for the gas to pass through the protrusion in the first direction X, and improves the gas passing efficiency.

Referring to fig. 4, 5 and 7, according to some embodiments of the application, the first protrusion 242 includes a bottom surface 242a and two third side surfaces 242c, the bottom surface 242a is abutted against the electrode assembly 23, the two third side surfaces 242c are located at two ends of the bottom surface 242a along the first direction X, the two third side surfaces 242c are respectively connected to the bottom surface 242a and the first surface 241a, and the first ventilation channel 2421 penetrates through the two third side surfaces 242c.

The first protrusion 242 may include a bottom surface 242a and an outer circumferential surface 242b, the outer circumferential surface 242b surrounding the bottom surface 242a, the outer circumferential surface 242b connecting 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 that are disposed opposite to each other in the first direction X.

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

The bottom surface 242a is a surface of the first protrusion 242 facing the electrode assembly 23, and the bottom surface 242a is for contacting the electrode assembly 23, i.e., the bottom surface 242a is a surface of the first protrusion 242 remote from the first surface 241 a.

The first ventilation channels 2421 penetrate through the two third side surfaces 242c, and may be the first ventilation channels 2421 disposed on the outer circumferential surface 242b of the first protrusion 242 viewed in the first direction X. The first ventilation channel 2421 may extend from one third side 242c to the other third side 242c.

In the above-described embodiments, the bottom surface 242a is the surface of the first protrusion 242 for abutting against the electrode assembly 23, and the positioning of the first insulating member 24 against the electrode assembly 23 can be achieved by abutting against the electrode assembly 23 through the bottom surface 242a, so that the electrode assembly 23 has good assembly stability. The first gas-permeable channels 2421 extend through the two third sides 242c to facilitate the passage of gas through the first protrusions 242 and reduce the barrier of the first protrusions 242 to the flow of gas.

In some embodiments, the first air-permeable 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. In order to secure the strength of the first protrusions 242, a certain distance is provided between the first air-permeable channel 2421 and the bottom surface 242a in the thickness direction Z of the first insulating member 24.

In some embodiments, the extension direction of the first ventilation channel 2421 may intersect the extension direction of the first protrusion 242 so that the gas located at both sides of the extension direction of the first protrusion 242 can pass through the first protrusion 242. For example, the angle between the extending direction of the first ventilation channel 2421 and the extending 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 °. Alternatively, the extension direction of the first ventilation channel 2421 is perpendicular to the extension direction of the first protrusion 242.

Referring to fig. 4 and 5, according to some embodiments of the application, the first ventilation channels 2421 are respectively formed with second openings 2421a on two third sides 242c, the area of the second openings 2421a is S1, and the area of the third sides 242c is S2, which satisfies 0.2.ltoreq.s 1/S2.ltoreq.0.8.

In some embodiments, the two third side surfaces 242c may constitute the outer circumferential surface 242b of the first protrusion 242 with other surfaces of the first protrusion 242.

The first ventilation channels 2421 are respectively formed with second openings 2421a on the two third side surfaces 242c such that the first ventilation channels 2421 extend from one third side surface 242c to the other third side surface 242c.

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

The area of the third side 242c refers to the area of the third side 242c where no ventilation channel is provided, and for example, when the third side 242c is rectangular, the area of the third side 242c may be the length of the rectangle multiplied by the width of the rectangle.

The ratio of the area S1 of the second opening 2421a to the area S2 of the third side 242c satisfies the above-described relationship (0.2.ltoreq.S1/S2.ltoreq.0.8), the gas can be facilitated to pass through the first protrusion 242, and the overall strength of the first protrusion 242 is high.

According to some embodiments of the application, 0.3.ltoreq.S1/S2.ltoreq.0.7.

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

Referring to fig. 4 and 5, according to some embodiments of the present application, the number of the first protrusions 242 is two, and the two first protrusions 242 are located at two ends of the first insulating body 241 along the first direction X.

In the above-described aspect, the number of the first protrusions 242 is two and are located at both ends of the first insulating body 241 in the first direction X so as to position the electrode assembly 23 at two positions in the first direction X, with a good positioning effect.

Referring to fig. 8, and further referring to fig. 12, fig. 12 is a schematic structural diagram of a battery cell according to another embodiment of the application. According to some embodiments of the present application, the first surface 241a, the two first protrusions 242, and the electrode assembly 23 enclose a first cavity P, a third gap Q3 is formed between the first protrusions 242 and the inner surface of the first sidewall 211 along the first direction X, and the first ventilation channel 2421 communicates the first cavity P and the third gap Q3.

The two first protrusions 242 are respectively abutted against the electrode assembly 23, and the first cavity P may be a space surrounded by the first surface 241a, opposite faces of the two first protrusions 242, and a side of the electrode assembly 23 facing the first surface 241 a.

The first protrusion 242 is not in contact with the first sidewall 211 in the first direction X such that a third gap Q3 is formed between the first protrusion 242 and the inner surface of the first sidewall 211.

The first ventilation channel 2421 is a hole penetrating the first protrusion 242 along the first direction X to communicate the first cavity P with the third gap Q3.

In the above-mentioned aspect, the first ventilation channel 2421 communicates the first cavity P with the third gap Q3, so as to facilitate the ventilation of the gas located at both sides of the first protrusion 242 in the first direction X, and reduce the blocking of the gas flow by the first protrusion 242.

According to some embodiments of the application, the first gap Q1 communicates with the third gap Q3.

In the embodiment in which 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 large so that the first gap Q1 communicates with the third gap Q3.

In the above-described aspect, the first gap Q1 communicates with the third gap Q3 so that the gas in the first gap Q1 flows toward the third gap Q3.

Referring to fig. 8, 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 sidewall 211 along the first direction X, and the second gap Q2 is in communication with the third gap Q3.

One end of the second insulating member 25 is connected to the first insulating member 24, and the second and third gaps Q2 and Q3 may have a partial overlap region in the first direction X.

In the above-described aspect, the second gap Q2 communicates with the third gap Q3 so that the gas flows between the second gap Q2 and the third gap Q3.

Referring to fig. 4 and 5, and further referring to fig. 13, fig. 13 is a cross-sectional view of a battery cell according to still another embodiment of the present application. According to some embodiments of the present application, the first insulating member 24 further includes a second protrusion 243, the second protrusion 243 protruding from the first surface 241a, the second protrusion 243 being disposed between two first protrusions 242 along the first direction X, the second protrusion 243 dividing the first cavity P into a first sub-cavity P1 and a second sub-cavity P2.

The second protrusion 243 may abut against the electrode assembly 23, and the second protrusion 243 divides the first chamber P into a first sub-chamber P1 and a second sub-chamber P2. In an embodiment in which the electrode assembly 23 includes the body portion 232 and the tab 231, the positive tab may be located in the first sub-chamber P1 and the negative tab may be located in the second sub-chamber P2.

In the above-described scheme, the second protrusions 243 are disposed between the two first protrusions 242 in the first direction X to increase the positioning effect of the first insulating member 24 on the electrode assembly 23.

According to some embodiments of the present application, the second protrusion 243 includes two fourth side surfaces 243b disposed opposite to each other in the first direction X, the second protrusion 243 is provided with a second ventilation passage 2431, and the second ventilation passage 2431 penetrates the two fourth side surfaces 243b to communicate the first sub-chamber P1 and the second sub-chamber P2.

The second ventilation passage 2431 penetrates through the two fourth sides 243b of the second protrusion 243 opposite in the first direction X, and the gas can rapidly pass through the second protrusion 243 to facilitate the flow of the gas between the first and second subchambers P1 and P2.

Referring to fig. 4 and 5, according to some embodiments of the application, the second protrusion 243 extends along a second direction Y, the second direction Y is perpendicular to the first direction X, and the second ventilation passage 2431 penetrates the second protrusion 243 along the first direction X.

The second protrusions 243 may have the same structure as the first protrusions 242.

The extending direction of the second protrusion 243 may be the length direction of the second protrusion 243, the extending direction of the second ventilation channel 2431 is perpendicular to the extending direction of the second protrusion 243, and the extending length of the second ventilation channel 2431 is shorter, that is, the path of the gas passing through the second protrusion 243 is shorter, so that the gas can pass through the second protrusion 243 quickly, and the smoothness of the flow of the gas in the first direction X is improved.

Referring to fig. 4 and 5, according to some embodiments of the application, the second protrusions 243 are provided with a plurality of second ventilation channels 2431, and the plurality of second ventilation channels 2431 are spaced apart along the second direction Y.

The plurality of second ventilation passages 2431 are disposed at intervals along the second direction Y, in other words, the plurality of second ventilation passages 2431 are disposed at intervals along the extending direction of the second protrusion 243. The plurality of second ventilation channels 2431 may be positioned on a straight line parallel to the second direction Y, or the plurality of second ventilation channels 2431 may be disposed in a dispersed manner.

In the above-mentioned scheme, the plurality of second ventilation channels 2431 are arranged at intervals along the extending direction of the second protrusions 243, so that the second protrusions 243 have a plurality of positions for gas circulation, which is beneficial for the gas to pass through the second protrusions 243 in the first direction X, and improves the gas passing efficiency.

In some embodiments, the number and configuration of second ventilation channels 2431 on the second protrusion 243 may be the same as the number and configuration of first ventilation channels 2421 on the first protrusion 242.

In some embodiments, the plurality of first ventilation channels 2421 diverge from a middle portion of the first protrusion 242 in the second direction Y toward both ends, as viewed in the first direction X. When the pressure relief mechanism 27 is disposed on the end cap 22, the plurality of first venting channels 2421 can cover the pressure relief mechanism 27 when viewed in the first direction X, such that gas can quickly flow toward the pressure relief mechanism 27 after passing through the first protrusions 242.

Referring to fig. 3, according to some embodiments of the present application, the battery cell 20 further includes a pressure release mechanism 27, the pressure release mechanism 27 is disposed on the end cover 22, and along a third direction, a projection of the second protrusion 243 on the end cover 22 at least partially overlaps the pressure release mechanism 27, and the first direction X, the second direction Y and the third direction are perpendicular to each other.

The third direction may be parallel to the thickness direction Z of the first insulating member 24, and the third direction may also be parallel to the thickness direction of the end cap 22.

The projection of the second protrusion 243 onto the end cap 22 may partially overlap with the pressure relief mechanism 27, or may completely overlap, as viewed in the third direction.

In the above-mentioned scheme, the pressure release mechanism 27 is disposed on the end cover 22, so that when the pressure release 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 release mechanism 27.

Referring to fig. 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 241b facing away from the electrode assembly 23, and the second surface 241b is provided with a third opening 2432 communicating with the inside of the second protrusion 243.

The third opening 2432 is a region provided on the second surface 241b for communicating with the inside of the second protrusion 243. The third opening 2432 may be a hollowed-out portion on the first insulating member 24, for example, the third opening 2432 may penetrate through the first insulating body 241 along the thickness direction Z of the first insulating member 24, that is, the third opening 2432 may extend from the second surface 241b to communicate with the interior of the second protrusion 243.

In embodiments where the projection of the second protrusion 243 onto the end cap 22 at least partially overlaps the relief mechanism 27, as viewed in the third direction (Z-direction), the projection of the relief mechanism 27 at least partially overlaps the projection of the third opening 2432 in a plane perpendicular to the third direction, e.g., the projection of the relief mechanism 27 may partially overlap the projection of the third opening 2432, or the projection of the relief mechanism 27 may completely overlap the projection of the third opening 2432.

In the above-mentioned scheme, the pressure release mechanism 27 is disposed corresponding to the second protrusion 243, the second protrusion 243 has a hollow structure, and the interior of the second protrusion 243 can collect gas, which is convenient for gas circulation; the gas located inside the second protrusion 243 can flow toward the third opening 2432, facilitating the venting of the gas inside the second protrusion 243, facilitating the venting of the pressure by the pressure relief mechanism 27.

Referring to fig. 3-5, according to some embodiments of the application, the second surface 241b is provided with a recess 2433 for receiving the pressure relief mechanism 27.

The recess 2433 may be a region of the first insulating body 241 for fitting with the pressure relief mechanism 27, and the recess 2433 may be recessed from the second surface 241b toward the first surface 241 a. The recess 2433 is provided in correspondence with the pressure relief mechanism 27, and a projection of the pressure relief mechanism 27 may be located within the recess 2433 as viewed in a thickness direction of the end cap 22.

The recess 2433 can at least partially overlap the third opening 2432, e.g., the recess 2433 can partially overlap the third opening 2432, or the recess 2433 can completely overlap the third opening 2432.

In the above solution, the groove 2433 corresponds to the pressure release mechanism 27, and the groove 2433 at least partially overlaps the third opening 2432, so that the gas flows toward the third opening 2432 after entering the second protrusion 243, so as to quickly reach the pressure release mechanism 27, and facilitate quick pressure release.

Referring to fig. 14 and 15, fig. 14 is a schematic structural view of a second protrusion according to some embodiments of the present application, and fig. 15 is a cross-sectional view of a battery cell according to still another embodiment of the present application. According to some embodiments of the present application, the second protrusion 243 includes two end surfaces 243a disposed opposite to each other in the second direction Y, and a fourth gap Q4 is provided between the end surfaces 243a and the inner surface of the housing 21 in the second direction Y, the second protrusion 243 is provided with a third ventilation passage 2434, the third ventilation passage 2434 penetrates the two end surfaces 243a, and the third ventilation passage 2434 communicates with the fourth gap Q4.

The wall portions where the two end surfaces 243a are located and the wall portions where the two fourth side surfaces 243b are located enclose an inner space of the second protrusion 243, the second protrusion 243 is of a hollow structure, the inner space of the second protrusion 243 forms a part of the second ventilation passage 2431, and at the same time, the inner space of the second protrusion 243 forms a part of the third ventilation passage 2434.

The two end surfaces 243a are located at opposite ends of the second protrusion 243 in the second direction Y, respectively. In embodiments in which the housing 21 includes the second sidewall 212, the end surface 243a may be a surface of the second protrusion 243 facing the second sidewall 212.

The end surface 243a is not in contact with the inner surface of the housing 21 in the second direction Y, so that the end cap 22 forms a fourth gap Q4 between the inner surface of the housing 21 in the second direction Y.

The third ventilation passage 2434 may be a hole provided in the end surface 243a and communicating with the inside of the second protrusion 243.

In the above-described aspect, the third ventilation passage 2434 penetrates through the two end surfaces 243a, and the third ventilation passage 2434 communicates with the fourth gap Q4 so that the gas flows between the inside of the second protrusion 243 and the fourth gap Q4.

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 ventilation passage 2434.

In some embodiments, the region of the second insulator 25 corresponding to the third venting passage 2434 may be removed to expose the third venting passage 2434. Alternatively, the edge of the second insulator 25 does not extend to the third venting passage 2434 so that the second insulator 25 does not block the third venting passage 2434.

In the above-described aspect, the second insulating member 25 does not block the third air-permeable passage 2434 so as to achieve communication of the fourth gap Q4 with the point air-permeable passage.

Referring to fig. 14 and 15, and further referring to fig. 16 and 17, fig. 16 is an assembly schematic diagram of a second insulating member and a second protrusion according to some embodiments of the present application, and fig. 17 is a partial enlarged view at B of fig. 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 is recessed from the third ventilation channel 2434.

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, and the third through hole 254 exposes the third ventilation passage 2434, so that the second insulating member 25 has a larger connection area with the second protrusion 243.

In some embodiments, the second notch 255 is disposed at an edge of the second insulating member 25 such that the third ventilation channel 2434 is exposed at the second notch 255 after the second insulating member 25 is connected to the first insulating member 24.

In the above-mentioned scheme, the third through hole 254 is arranged to facilitate the communication between the fourth gap Q4 and the third ventilation channel 2434, and the second insulating member 25 and the second protrusion 243 may have a larger connection area; the second notch 255 is formed at the edge of the second insulating member 25, so as to facilitate manufacturing.

Referring to fig. 18, fig. 18 is a schematic structural diagram of a pressure release mechanism provided 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 disposed opposite to each other along the second direction Y, the first side wall 211 and the second side walls 212 are connected to the bottom wall 213, the end cap 22 is disposed opposite to the bottom wall 213 along the third direction, and the first direction X, the second direction Y and the third direction are perpendicular to each other; the battery cell 20 further includes a pressure release mechanism 27, and the pressure release mechanism 27 is disposed on the bottom wall 213.

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

The two first side walls 211, the two second side walls 212, and the bottom wall 213 enclose a space for accommodating the electrode assembly 23, and the case 21 may have a rectangular parallelepiped shape.

In the above-mentioned scheme, the pressure release mechanism 27 is disposed on the bottom wall 213, and the electrode terminal 26 may be disposed on the end cover 22, so as to reduce the pollution of the electrode terminal 26 by the excrement discharged by the pressure release mechanism 27.

Referring to fig. 19 and 20, fig. 19 is an exploded view of a battery cell according to another embodiment of the present application, and fig. 20 is a cross-sectional view of a battery cell according to another embodiment 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 sidewall 211 along the first direction X; the battery cell 20 further includes a separator 28, where the separator 28 is disposed between the electrode assembly 23 and the bottom wall 213, and is used for separating the electrode assembly 23 from the bottom wall 213, and the separator 28 is provided with a fourth ventilation channel 281, and the fourth ventilation channel 281 communicates with the second gap Q2 and the pressure release mechanism 27.

The separator 28 is a member for separating the bottom wall 213 and the electrode assembly 23. The spacer 28 may be an electrically insulating member or a metal member.

Optionally, the separator 28 is an electrically insulating member, and the separator 28 insulates the separator bottom wall 213 and the electrode assembly 23.

In some embodiments, the separator 28 may be a bottom plate, and the separator 28 is disposed under the electrode assembly 23 to support the electrode assembly 23.

The fourth ventilation passage 281 may be a passage provided in the separator 28 to guide the flow of gas. The fourth ventilation channel 281 extends to the edge of the partition 28 so that the fourth ventilation channel 281 communicates with the second gap Q2.

In the third direction, the projection of the pressure relief mechanism 27 at least partially overlaps the fourth venting passage 281 such that the fourth venting passage 281 communicates with the pressure relief mechanism 27.

In some embodiments, the fourth venting channel 281 may include a portion facing the electrode assembly 23 and a portion extending through the separator 28 in the third direction, such that the fourth venting channel 281 communicates the second gap Q2 with the pressure relief mechanism 27. In other embodiments, the fourth ventilation channel 281 is disposed on a side of the partition 28 facing the bottom wall 213, so that the fourth ventilation channel 281 communicates between the second gap Q2 and the pressure release mechanism 27.

In the above scheme, the arrangement of the separator 28 can isolate the electrode assembly 23 from the bottom wall 213, reduce the risk of the contact between the housing 21 and the electrode assembly 23, and when the separator 28 is arranged below the electrode assembly 23, the separator 28 can play a role in supporting the electrode assembly 23, so that the electrode assembly 23 is stably positioned in the housing 21, and reduce the risk of movement of the electrode assembly 23. The fourth ventilation channel 281 communicates the second gap Q2 with the pressure relief mechanism 27, so that the gas in the second gap Q2 can flow toward the pressure relief mechanism 27 quickly.

Referring to fig. 20, according to some embodiments of the present application, the fourth ventilation channel 281 includes a vent slot 2811 disposed on a side of the separator 28 facing the bottom wall 213.

In some embodiments, the vent slot 2811 may extend through the spacer 28 in the first direction X such that the fourth vent passage 281 communicates with the second gap Q2.

Vent slot 2811 may be disposed away from electrode assembly 23, the opening of vent slot 2811 may be oriented toward bottom wall 213, vent slot 2811 may enclose a vent channel with bottom wall 213, and pressure relief mechanism 27 and vent slot 2811 may at least partially overlap in a third direction such that fourth vent channel 281 communicates second gap Q2 with pressure relief mechanism 27.

In the above arrangement, the vent slot 2811 can facilitate gas flow between the spacer 28 and the bottom wall 213 to facilitate rapid gas flow toward the pressure relief mechanism 27.

Referring to fig. 3 and 19, according to some embodiments of the present application, the electrode assembly 23 is a rolled structure, and the extending direction of the rolling axis of the electrode assembly 23 is perpendicular to the first direction X.

In some embodiments, the electrode terminal 26 may be disposed at the end cap 22, and the extension direction of the winding axis of the electrode assembly 23 may be parallel to the thickness direction (Z direction) of the end cap 22, and the tab of the electrode assembly 23 extends from one end of the extension direction of the winding axis of the electrode assembly 23 so as to be connected with the electrode terminal 26.

In the above-described aspects, the extending 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 with the electrode terminals 26 provided to the cap 22.

Referring to fig. 3 and 19, according to some embodiments of the present application, the number of electrode assemblies 23 is plural, and the plurality of electrode assemblies 23 are stacked along a second direction Y, which is perpendicular to the first direction X.

In the above-described aspects, the number of the electrode assemblies 23 is plural, so that the manufacturing is facilitated.

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

According to some embodiments of the present application, the second insulating member 25 is thermally fused to the first insulating member 24, so that the connection stability of the second insulating member 25 to the bump is better.

According to some embodiments of the present application, the first insulating body 241 further has a second surface 241b, the second surface 241b is disposed opposite to the first surface 241a along the thickness direction Z of the first insulating member 24, and the first protrusions 242 are formed with the concave portions 2422 at corresponding positions on the second surface 241b, so that the weight of the first insulating member 24 can be reduced.

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

The positioning portion 244 is a member disposed on the second surface 241b for connecting and positioning with the end cap 22, and the positioning portion 244 may protrude from the second surface 241b. The positioning portion 244 may be a positioning rod, and the cross section of the positioning rod may be circular, rectangular, triangular, or shaped. Optionally, the section of the positioning rod is circular, so that the processing is convenient. The shape of the positioning hole corresponds to the section shape of the positioning rod.

The positioning part 244 is inserted into the positioning hole, so that the first insulating piece 24 and the end cover 22 are assembled, the structure is simple, and the operation is convenient.

According to some embodiments of the present application, there is also provided a battery 100 including the battery cell 20 provided in any of the above embodiments.

According to some embodiments of the present application, there is further provided an electrical device, including the battery cell 20 or the battery 100 provided in any one of the embodiments, where the battery cell 20 or the battery 100 is used to provide electrical energy.

The powered device may be any of the devices or systems described above that employ battery cells 20 or battery 100.

Referring to fig. 3 to 20, according to some embodiments of the present application, a battery cell 20 is provided, and the battery cell 20 has a rectangular parallelepiped shape. The battery cell 20 includes a case 21, an end cap 22, an electrode assembly 23, a first insulating member 24, a second insulating member 25, and an electrode terminal 26.

The housing 21 has a first opening 21a, and the housing 21 includes two first side walls 211 disposed opposite to each other in the first direction X, two second side walls 212 disposed opposite to each other in the second direction Y, and a bottom wall 213. The first direction X, the second direction Y and the third direction are perpendicular to each other. The area of the first sidewall 211 is smaller than the area of the second sidewall 212.

The end cap 22 closes the first opening 21a, and the electrode terminal 26 is provided to the end cap 22.

The electrode assembly 23 is disposed in the case 21, the electrode assembly 23 is in a winding structure, and an extending direction of a winding axis of the electrode assembly 23 is perpendicular to the first direction X and parallel to the third direction. The tab of the electrode assembly 23 extends from one end of the electrode assembly 23 in the extending direction of the winding axis to be connected with the electrode terminal 26. The electrode assembly 23 includes a first side 23a facing the first side wall 211.

The first insulating member 24 is disposed between the end cap 22 and the electrode assembly 23, and 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 shown disposed on the first surface 241a. The two first protrusions 242 are located at opposite ends of the first insulating body 241 in the first direction X, and the second protrusions 243 are located between the two first protrusions 242 in the first direction X. The first protrusion 242 and the second protrusion 243 abut against the electrode assembly 23.

The first insulating body 241 is a rectangular plate, the first protrusion 242 and the second protrusion 243 each extend along the second direction Y, and the second protrusion 243 is a length direction of the first insulating body 241.

The first protrusion 242 includes a bottom surface 242a and an outer circumferential surface 242b, the bottom surface 242a is configured to abut against the electrode assembly 23, the outer circumferential surface 242b is disposed around the bottom surface 242a, and the outer circumferential surface 242b connects the bottom surface 242a and the first surface 241a. The first protrusion 242 is provided with a first ventilation channel 2421, the first ventilation channel 2421 is provided on the outer circumferential surface 242b, and the first ventilation channel 2421 penetrates the first protrusion 242 along the first direction X. The first protrusion 242 is provided with a plurality of first air-permeable channels 2421, and the plurality of first air-permeable channels 2421 are spaced apart in the second direction Y. The first protrusion 242 includes two third side surfaces 242c disposed opposite to each other along the first direction X, the first ventilation channel 2421 penetrates through the two third side surfaces 242c, the flow area of the first ventilation channel 2421 is S1, and the area of the third side surface 242c is S2, which satisfies that S1/S2 is greater than or equal to 0.2 and less than or equal to 0.8.

The second protrusions 243 are provided with second ventilation channels 2431, the structure of the second protrusions 243 is the same as that of the first protrusions 242, and the number and structure of the second ventilation channels 2431 provided on the second protrusions 243 are the same as those of the first ventilation channels 2421 provided on the first protrusions 242.

The second insulating member 25 surrounds the electrode assembly 23 to insulate the electrode assembly 23 from the case 21, and the second insulating member 25 is connected with the first protrusion 242 and the second protrusion 243.

A first gap Q1 is formed between the second insulating member 25 and the first side surface 23a in the first direction X, and the first gap Q1 communicates with the first air-permeable channel 2421. A second gap Q2 is formed between the second insulating member 25 and the inner surface of the first sidewall 211 in the first direction X, and the second gap Q2 communicates with the first ventilation channel 2421. The second insulating member 25 is provided with a first through hole 251 or a first notch 252 that is provided so as to avoid the first air-permeable channel 2421, and the first gap Q1 and the second gap Q2 are communicated through the first through hole 251 or the first notch 252. The second insulating member 25 is provided with a second through hole 253, and the second through hole 253 communicates with the first gap Q1 and the second gap Q2.

The first surface 241a, the two first protrusions 242, and the electrode assembly 23 define a first cavity P, a third gap Q3 is formed between the first protrusions 242 and the inner surface of the first sidewall 211 along the first direction X, the first ventilation channel 2421 communicates with the first cavity P and the third gap Q3, the first gap Q1 communicates with the third gap Q3, and the second gap Q2 communicates with the third gap Q3. The second protrusion 243 divides the first chamber P into a first sub-chamber P1 and a second sub-chamber P2, and the second ventilation passage 2431 communicates the first sub-chamber P1 and the second sub-chamber P2.

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

In some embodiments, the battery cell 20 further includes a pressure relief mechanism 27, and the pressure relief mechanism 27 is disposed on the bottom wall 213. A second gap Q2 is formed between the second insulator 25 and the inner surface of the first sidewall 211 along the first direction X; the battery cell 20 further includes a separator 28, where the separator 28 is disposed between the electrode assembly 23 and the bottom wall 213, and is used for separating the electrode assembly 23 from the bottom wall 213, and the separator 28 is provided with a fourth ventilation channel 281, and the fourth ventilation channel 281 communicates with the second gap Q2 and the pressure release mechanism 27. The fourth ventilation channel 281 comprises a vent slot 2811 provided at the side of the partition 28 facing the bottom wall 213.

According to the battery cell 20 of the embodiment of the application, the first protrusions 242 are provided with the first ventilation channels 2421, and the second protrusions 243 are provided with the second ventilation channels 2431, so that the blocking of the gas flow by the first protrusions 242 and the second protrusions 243 can be reduced. Because the first gap Q1 is communicated with the first ventilation channel 2421, when the battery cell 20 is depressurized, the gas generated by the electrochemical reaction of the electrode assembly 23 can flow toward the first ventilation channel 2421 through the first gap Q1, the gas can quickly pass through the first protrusion 242 and the second protrusion 243, and the gas can flow smoothly, so that the gas can flow to the pressure release mechanism 27 in time and be depressurized in time, so that the battery cell 20 has higher reliability.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, comprising:

a housing having a first opening, the housing including two first side walls disposed opposite in a first direction;

an end cap closing the first opening;

an electrode assembly disposed within the housing;

a first insulating member disposed between the end cap and the electrode assembly;

a second insulating member wrapping at least a portion of the electrode assembly and the first insulating member for insulating and isolating the electrode assembly and the case;

wherein the first insulating member is provided with a first ventilation passage, the electrode assembly includes a first side facing the first side wall, a first gap is formed between the second insulating member and the first side wall along the first direction, and the first gap is communicated with the first ventilation passage.

2. The battery cell of claim 1, wherein the first insulator comprises a first insulator body having a first surface facing the electrode assembly and a first protrusion protruding from the first surface, the first protrusion being provided with the first ventilation channel extending through the first protrusion in the first direction.

3. The battery cell of claim 2, wherein a second gap is formed between the second insulator and the inner surface of the first sidewall in the first direction, the second gap being in communication with the first vent passage.

4. The battery cell of claim 3, wherein the second insulator is coupled to the first protrusion, the second insulator not shielding the first ventilation channel.

5. The battery cell of claim 4, wherein the second insulator is provided with a first through hole or a first notch that bypasses the first ventilation channel.

6. The battery cell of claim 5, wherein the first gap and the second gap communicate through the first through hole or the first notch.

7. The battery cell according to claim 5, wherein the second insulating member includes a first insulating portion and a second insulating portion, the first insulating portion corresponds to the first side face in the first direction, the second insulating portion corresponds to the first insulating member, the first insulating portion is provided with a second through hole, the second through hole communicates the first gap and the second gap, and the first through hole or the first notch is provided in the second insulating portion.

8. The battery cell of claim 2, wherein the housing further comprises two second side walls disposed opposite each other in a second direction, the second direction being perpendicular to the first direction, the first side walls having an area smaller than an area of the second side walls;

the electrode assembly comprises two first side surfaces and two second side surfaces, wherein the two first side surfaces are respectively opposite to the first side wall on the same side along the first direction, the two second side surfaces are respectively opposite to the second side wall on the same side along the second direction, and the area of the first side surfaces is smaller than that of the second side surfaces.

9. The battery cell of claim 2, wherein the first protrusion extends in a second direction that is perpendicular to the first direction, the first vent passage extending through the first protrusion in the first direction.

10. The battery cell of claim 9, wherein the first protrusion is provided with a plurality of the first ventilation channels, the plurality of the first ventilation channels being spaced apart along the second direction.

11. The battery cell according to claim 2, wherein the first protrusion includes a bottom surface and two third side surfaces, the bottom surface is abutted to the electrode assembly, the two third side surfaces are located at two ends of the bottom surface along the first direction, the two third side surfaces are respectively connected to the bottom surface and the first surface, and the first ventilation channel penetrates through the two third side surfaces.

12. The battery cell according to claim 11, wherein the first ventilation channels are formed with second openings on the two third sides, respectively, the second openings have an area of S1, and the third sides have an area of S2, so that 0.2.ltoreq.s1/s2.ltoreq.0.8 is satisfied.

13. The battery cell of claim 12, wherein 0.3 +.s1/s2 +.0.7.

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

15. The battery cell of claim 14, wherein the first surface, the two first protrusions, and the electrode assembly define a first cavity, a third gap is formed between the first protrusions and the inner surface of the first sidewall in the first direction, and the first vent channel communicates the first cavity and the third gap.

16. The battery cell of claim 15, wherein the first gap communicates with the third gap.

17. The battery cell of claim 15, wherein a second gap is formed between the second insulator and the inner surface of the first sidewall in the first direction, the second gap being in communication with the third gap.

18. The battery cell of claim 15, wherein the first insulator further comprises a second protrusion protruding from the first surface, the second protrusion disposed between two of the first protrusions in the first direction, the second protrusion dividing the first cavity into a first subchamber and a second subchamber.

19. The battery cell of claim 18, wherein the second protrusion includes two fourth sides disposed opposite in the first direction, the second protrusion being provided with a second vent passage extending through the two fourth sides to communicate the first subchamber and the second subchamber.

20. The battery cell of claim 19, wherein the second protrusion extends in a second direction, the second direction being perpendicular to the first direction, the second vent passage extending through the second protrusion in the first direction.

21. The battery cell of claim 20, wherein the second protrusion is provided with a plurality of the second ventilation channels, the plurality of the second ventilation channels being spaced apart along the second direction.

22. The battery cell of claim 20, further comprising a pressure relief mechanism disposed in the end cap, wherein a projection of the second protrusion onto the end cap along a third direction at least partially overlaps the pressure relief mechanism, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

23. The battery cell of claim 22, wherein the second protrusion is a hollow structure, the first insulating body having a second surface facing away from the electrode assembly, the second surface being provided with a third opening in communication with an interior of the second protrusion.

24. The battery cell of claim 23, wherein the second protrusion includes two end surfaces disposed opposite each other in the second direction, a fourth gap is provided between the end surfaces and the inner surface of the case in the second direction, and a third ventilation passage is provided through the two end surfaces, the third ventilation passage communicating with the fourth gap.

25. The battery cell of claim 24, wherein the second insulator is coupled to the second protrusion, the second insulator not shielding the third vent passage.

26. The battery cell of claim 25, wherein the second insulator is provided with a third through hole or a second notch that bypasses the third vent passage.

27. The battery cell of any one of claims 1-21, wherein the housing further comprises a bottom wall and two second side walls disposed opposite in a second direction, the first side wall and the second side wall being connected to the bottom wall, the end cap being disposed opposite the bottom wall in a third direction, the first direction, the second direction, and the third direction being perpendicular to each other;

the battery cell also comprises a pressure relief mechanism, and the pressure relief mechanism is arranged on the bottom wall.

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

29. A powered device comprising the battery of claim 28, the battery configured to provide electrical energy.