Battery monomer, battery and electric device

Abstract

The utility model belongs to the technical field of batteries, and provides a battery monomer, a battery and a power utilization device, the battery monomer comprises a shell, a battery cell assembly and a separator, the shell is provided with an inner cavity, and the shell comprises a first wall; the battery core assembly is arranged in the inner cavity; the separator is arranged between the first wall and the battery cell assembly, and the separator is respectively abutted against the first wall and the battery cell assembly; the spacer includes a metal layer. The utility model aims to solve the technical problem of high thermal runaway risk of the battery in the prior art.

Description

[0001] This application claims priority to the PCT patent application filed with the World Intellectual Property Organization on November 6, 2023, with application number PCT / CN2023 / 130015 and invention name “Battery Cell, Battery and Electrical Equipment”, the entire contents of which are incorporated by reference in this application. Technical Field

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

[0003] Batteries are widely used in various fields of production and life. When the battery is in use, the battery core components generate heat, and the heat is dissipated between the heat and the shell through the air. The heat dissipation efficiency is low and the heat is not diffused in time, which increases the risk of thermal runaway of the battery. Utility Model Content

[0004] The purpose of the present application is to provide a battery cell, a battery and an electrical device, aiming to solve the technical problem of high risk of thermal runaway of the battery.

[0005] In a first aspect, the present application provides a battery cell, comprising:

[0006] a housing having an interior cavity, the housing comprising a first wall;

[0007] A battery cell assembly is disposed in the inner cavity; and

[0008] The isolating member is disposed between the first wall and the battery cell assembly, and the isolating member abuts against the first wall and the battery cell assembly respectively; the isolating member includes a metal layer.

[0009] In this example, an isolation member is arranged between the first wall and the battery cell assembly, and the isolation member is respectively in contact with the first wall and the battery cell assembly, so that a portion of the heat generated by the battery cell assembly can be transferred to the outer casing through the isolation member, and then diffused to the outside, thereby achieving the purpose of heat transfer and heat conduction to the battery cell assembly; in addition, the isolation member includes a metal layer, and the metal layer has a high thermal conductivity, which can increase the thermal conduction rate of the battery cell assembly to achieve the purpose of rapid heat conduction to the battery cell assembly; furthermore, the metal layer has a strong anti-destruction ability, so that the isolation member is not easily damaged when the pressure relief mechanism is releasing pressure, which is beneficial to ensuring the service life of the battery.

[0010] In one of the embodiments, the metal layer includes one of aluminum, magnesium, zinc, titanium, nickel, copper and alloys thereof.

[0011] In this example, materials such as aluminum, magnesium, zinc, titanium, nickel, copper and their alloys have good thermal conductivity and can improve the thermal conductivity rate of the battery cell assembly to achieve the purpose of rapid thermal conduction of the battery cell assembly; the above materials also have good ductility and strong plastic deformation ability. The isolation parts prepared with the above materials can resist the impact force generated when the pressure relief mechanism releases pressure and are not easy to be damaged, which is beneficial to ensure the service life of the battery; in addition, the above materials also have good corrosion resistance. There is electrolyte inside the battery cell, and the electrolyte is corrosive, and the isolation parts prepared with the above materials can resist the corrosion of the electrolyte.

[0012] In one of the embodiments, the isolation member has two side surfaces, the two side surfaces are respectively arranged toward the first wall and the battery cell assembly, and an oxide layer is formed on a surface of at least one of the two side surfaces.

[0013] In this example, the oxide layer can improve the insulation performance, damage resistance and corrosion resistance of the isolation element.

[0014] In one of the embodiments, the battery cell further includes an insulating film wrapped around the outside of the battery cell assembly, the isolation member abuts against the insulating film, and the isolation member is disposed on a side of the insulating film away from the battery cell assembly.

[0015] In this example, the heat generated by the battery cell assembly can be transferred to the insulating film. Therefore, when the isolating member contacts the battery cell assembly, the isolating member will directly abut against the insulating film, forming a contact area between the isolating member and the insulating film. The isolating member transfers the heat on the insulating film to the outer casing, thereby achieving the purpose of heat conduction and heat dissipation of the battery cell assembly and the insulating film.

[0016] In one embodiment, the insulating film is folded and wrapped around the battery cell assembly to form a first folded edge and a second folded edge that overlap each other on the side of the battery cell assembly, and a positioning hole is provided at the portion of the insulating film between the battery cell assembly and the isolation member; the battery cell also includes a tape, and the tape includes a first part and a second part that are connected to each other, the first part is arranged between the isolation member and the insulating film and covers the positioning hole, and the second part fixes the first folded edge and the second folded edge.

[0017] In this example, the insulating film is wrapped around the outside of the battery cell assembly and connected on the side by overlapping the first folded edge and the second folded edge to improve the sealing of the insulating film. The first folded edge and the second folded edge are then bonded by tape to improve the firmness of the connection between the first folded edge and the second folded edge. The positioning hole is covered with tape to ensure the insulation and sealing effect of the insulating film.

[0018] In one of the embodiments, the battery cell further includes a pressure relief mechanism disposed on the first wall, and an exhaust channel is formed on the isolation member, and the exhaust channel is connected to the pressure relief mechanism.

[0019] In this example, the gas in the exhaust passage can flow smoothly to the pressure relief mechanism, and the pressure relief mechanism can open in time to release the gas.

[0020] In one of the embodiments, the exhaust passage is connected to an edge of the partition in a first direction, and the first direction intersects with a thickness direction of the first wall.

[0021] In this example, the first direction intersects with the thickness direction of the first wall, and the exhaust channel is connected to the edge of the isolation member in the first direction, so that the airflow outside the edge of the isolation member in the first direction can enter the exhaust channel to flow toward the location of the pressure relief mechanism.

[0022] In one of the embodiments, the housing further includes a second wall, the second wall is connected to the first wall, a gap is formed between the second wall and the outer peripheral surface of the battery cell assembly, and the gap is connected to the exhaust channel.

[0023] In this example, by forming a gap, a space for air flow can be formed on the outer peripheral surface of the battery cell assembly. During the flow of air, the flowing air can carry the heat generated by the outer peripheral surface of the battery cell assembly to the exhaust channel, thereby improving the cooling performance of the outer peripheral surface of the battery cell assembly and reducing the possibility of local temperature rise at the outer peripheral surface of the battery cell assembly.

[0024] In one embodiment, the isolation member includes a support plate and a plurality of protrusions, the support plate has a first surface, and the plurality of protrusions are connected to the first surface and surround the exhaust channel.

[0025] In this example, a plurality of protrusions are connected on the first surface to form an exhaust channel, which can fully utilize the surface of the support plate to increase the total area of ​​the exhaust channel, increase the flow space of the airflow, and help improve the fluidity of the airflow.

[0026] In one embodiment, the protrusion is integrally formed on the support plate.

[0027] In this example, the protrusion and the support plate are integrally formed, which can ensure the structural strength of the isolation member on the one hand, and on the other hand, can ensure the consistency of the protruding height of the protrusion, ensure the fit of the protruding end face of the protrusion when it contacts the first wall or the battery cell assembly, and ensure the heat conduction effect.

[0028] In one embodiment, the first surface is disposed toward the first wall.

[0029] In this example, the isolation member is arranged between the first wall and the battery cell assembly, with the protrusion arranged toward the first wall, so that the support plate can contact the battery cell assembly for heat conduction, and the air flow can also conduct heat to the outer shell in the exhaust channel, thereby enhancing the heat dissipation effect of the outer shell and improving the heat dissipation efficiency.

[0030] In one embodiment, the support plate has a first edge and a second edge opposite to each other along a first direction, the multiple protrusions include at least a first protrusion and a second protrusion, the first protrusion and the second protrusion both extend along the first direction and are located between the first edge and the second edge, the first protrusion and the second protrusion are spaced in a third direction to form the exhaust channel, and the third direction is perpendicular to the first direction; the first direction is a direction perpendicular to the thickness of the support plate.

[0031] In this example, by providing the first protrusion and the second protrusion, the space between the first protrusion and the second protrusion forms an exhaust channel, and the first edge and the second edge of the exhaust channel form openings, so that the airflow can flow into the exhaust channel from the first edge and the second edge, and flow along the exhaust channel to the position of the pressure relief mechanism, thereby guiding and draining the airflow, reducing local airflow aggregation, and reducing the problem of excessive local temperature rise.

[0032] In one embodiment, the plurality of raised portions further include a plurality of third raised portions located between the first raised portion and the second raised portion, some of the third raised portions are located at the first edge and together with the first raised portion and the second raised portion to form a plurality of channel entrances, and the remaining third raised portions are located at the second edge and together with the first raised portion and the second raised portion to form a plurality of channel entrances.

[0033] In this example, by providing a plurality of third protrusions, a plurality of channel entrances are formed on the first edge and the second edge of the exhaust channel respectively, so as to achieve the purpose of diverting the airflow, so that the airflow can enter the exhaust channel from multiple directions, thereby increasing the ability to converge and guide the airflow, which is beneficial to improving the fluidity of the airflow and improving the thermal conductivity and heat dissipation capacity of the isolation component.

[0034] In one embodiment, along the first direction, the plurality of third protrusions are arranged at intervals, and the pressure relief mechanism is disposed relative to the interval area between the plurality of third protrusions.

[0035] In this example, by providing a plurality of third protrusions, at least two channel entrances are formed on the first edge of the exhaust channel, and at least two channel entrances are formed on the second edge of the exhaust channel, so as to achieve the purpose of diverting the airflow, and by forming a plurality of channel entrances, the airflow can enter the exhaust channel from multiple directions, thereby increasing the ability to converge and guide the airflow, which is beneficial to improving the fluidity of the airflow and improving the thermal conductivity and heat dissipation capabilities of the isolation component.

[0036] In one embodiment, the first protrusion has a first side facing the exhaust passage, a portion of the first side protrudes outward toward the second protrusion to form a first blocking wall, and a surface of the first blocking wall faces the first edge.

[0037] In this example, a first baffle is formed on the first side of the first protrusion, and the first baffle is used to block the gas entering the exhaust channel so that the gas can gather at the position of the first baffle. After the gas is gathered, it can be discharged through the pressure relief mechanism, thereby improving the directional pressure relief capability of the battery cell and helping to improve the performance of the pressure relief mechanism.

[0038] In one embodiment, the second protrusion has a second side facing the exhaust passage, a portion of the second side protrudes outward toward the first protrusion to form a second blocking wall, and a surface of the second blocking wall faces the second edge.

[0039] In this example, a second baffle is formed on the second side of the second protrusion, and the second baffle is used to block the gas entering the exhaust channel so that the gas can gather at the position of the second baffle. After the gas is gathered, it can be discharged through the pressure relief mechanism, thereby improving the directional pressure relief capability of the battery cell and helping to improve the performance of the pressure relief mechanism.

[0040] In one embodiment, the surface of the first baffle wall faces the surface of the second baffle wall, and the first baffle wall and the second baffle wall are spaced apart from each other, and the pressure relief mechanism is disposed relative to the spaced area between the first baffle wall and the second baffle wall.

[0041] In this example, the gas accumulates between the first baffle wall and the second baffle wall to be relatively connected with the pressure relief mechanism, so that the pressure relief mechanism can open and release pressure in time, which is beneficial to improving the performance of the pressure relief mechanism.

[0042] In one embodiment, a second guide section is formed on the second side edge and is inclined from the first edge toward the first side edge along the first direction. The second guide section is connected to the second baffle wall and its diversion direction is toward the first baffle wall.

[0043] In this example, by configuring the second guide section, the gas entering the exhaust channel from the first channel inlet can flow toward the first baffle wall under the guiding action of the second guide section, thereby improving the directionality of the gas flow toward the first baffle wall. Through the blocking effect of the first baffle wall, the gas can converge at the position of the first baffle wall, thereby improving the blocking effect of the first baffle wall on the gas.

[0044] In one embodiment, a first guide section is formed on the first side edge and is inclined from the second edge toward the second side edge along the first direction. The first guide section is connected to the first baffle wall and its diversion direction is toward the second baffle wall.

[0045] In this example, by configuring the first guide section, the gas entering the exhaust channel from the second channel inlet can flow toward the second baffle wall under the guiding action of the first guide section, thereby improving the directionality of the gas flow toward the second baffle wall. Through the blocking effect of the second baffle wall, the gas can converge at the position of the second baffle wall, thereby improving the blocking effect of the second baffle wall on the gas.

[0046] In one embodiment, the outer convex height of the protrusion is 0.4mm-0.8mm; and / or

[0047] The thickness of the support plate is 0.4mm-0.8mm.

[0048] In this example, the outer convex height of the protrusion and the thickness of the support plate are reasonably designed so as not to occupy too much space in the inner cavity. The outer convex height of the protrusion satisfies the space for fluid passage, ensuring the volume of the battery cell assembly and further ensuring the energy density of the battery cell.

[0049] In one embodiment, the support plate has a second surface disposed opposite to the first surface, and a recess is formed on the second surface.

[0050] In this example, the recessed portion forms a groove structure on the second surface, so as to reduce the overall weight of the support plate by removing material from the second surface, which is beneficial to achieving lightweighting of the support plate.

[0051] In one embodiment, the concave portion and the convex portion are arranged in a one-to-one alignment in the thickness direction of the support plate.

[0052] In this example, the recessed portion can reduce the overall weight of the support plate, which is beneficial to achieving lightweighting of the support plate. In addition, the recessed portion can also be a stamping groove formed when stamping the protruding portion, thereby achieving integrated stamping forming of the support plate and the protruding portion.

[0053] In one embodiment, the first protrusion and the second protrusion are respectively formed by bending two edges of the support plate perpendicular to the first direction.

[0054] In this example, the first protrusion and the second protrusion are both formed by bending, so that the isolation member as a whole can be formed in one piece, and the isolation member as a whole has higher rigidity and better supporting stability.

[0055] In one embodiment, the housing includes a shell and an end cover, the shell is provided with a receiving opening, the end cover is connected to the shell and covers the receiving opening, and the first wall is a wall of the shell or the end cover.

[0056] In this example, the end cover is used to seal the inner cavity of the shell so that the inner cavity forms a closed space, and the battery cell assembly is accommodated in the closed space. Both the end cover and the shell can protect the battery cell assembly.

[0057] In a second aspect, the present application provides a battery, which includes the battery cell in the above embodiment.

[0058] In a third aspect, the present application provides an electrical device, which includes the battery in the above embodiment, and the battery is used to provide electrical energy.

[0059] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0061] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0062] Figure 2 A schematic diagram of the exploded structure of a battery provided in some embodiments of the present application;

[0063] Figure 3 A schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0064] Figure 4 for Figure 3 A partial view of

[0065] Figure 5 A front view of an isolation member in a battery cell according to some embodiments of the present application;

[0066] Figure 6 for Figure 5 AA section view in;

[0067] Figure 7 for Figure 5 Axonometric Figure 1 ;

[0068] Figure 8 for Figure 5 Axonometric Figure 2 ;

[0069] Fig. 9 A schematic diagram of the structure of another isolation member in a battery cell in some embodiments of the present application;

[0070] Fig.10 A front view of another isolating member in a battery cell in some embodiments of the present application;

[0071] Fig.11 for Fig.10 A top view of

[0072] Fig.12 Schematic diagram of the exploded structure of battery cells of other embodiments of the present application;

[0073] Fig.13 A schematic diagram of the flow direction of airflow in a battery cell provided in some embodiments of the present application;

[0074] Fig.14 A cross-sectional view of a battery cell along a first direction provided in an embodiment of the present application;

[0075] Fig.15 Schematic diagram of the exploded structure of battery cells in some other embodiments of the present application;

[0076] Fig.16 A front view of an isolation member in a battery cell according to some other embodiments of the present application;

[0077] Fig.17 for Fig.16 BB section view in;

[0078] Fig.18 for Fig.16 Axonometric Figure 1 ;

[0079] Fig.19 for Fig.16 Axonometric Figure 2 ;

[0080] Fig. 20 A schematic diagram of the flow direction of airflow in a battery cell provided in some other embodiments of the present application;

[0081] Fig.21The exploded structure of the battery cell of some other embodiments of the present application is shown in FIG. Figure 1 ;

[0082] Fig. 22 The exploded structure of the battery cell of some other embodiments of the present application is shown in FIG. Figure 2 ;

[0083] Fig.23 The exploded structure of the battery cell of some other embodiments of the present application is shown in FIG. Figure 3 ;

[0084] Fig.24 A front view of an isolation member in a battery cell in some other embodiments of the present application;

[0085] Fig.25 A schematic diagram of the flow direction of airflow on a separator in a battery cell in some other embodiments of the present application;

[0086] Fig.26 for Fig.24 Rear view in;

[0087] Fig. 27 for Fig.26 CC section view in;

[0088] Fig.28 for Fig. 27 A partial magnified view of the D part;

[0089] Fig.29 for Fig.26 axonometric drawing;

[0090] Fig.30 A schematic diagram of the flow direction of airflow in a battery cell provided in some other embodiments of the present application;

[0091] Fig.31 Schematic diagram of the external structure of an insulating film in a battery cell provided in some embodiments of the present application Figure 1 ;

[0092] Fig.32 Schematic diagram of the external structure of an insulating film in a battery cell provided in some embodiments of the present application Figure 2 .

[0093] Description of reference numerals:

[0094] 1000, vehicle; 100, battery; 10, box; 11, first component; 12, second component; 20, battery cell; 21, shell; 211, shell; 2111, inner cavity; 2112, accommodating opening; 212, end cover; 213, first wall; 214, second wall; 22, battery cell assembly; 221, bare battery cell; 222, insulating film; 2221, first folding edge; 2222, second folding edge; 2223, positioning hole; 23, spacer; 231, support plate; 2311, first surface; 2312, second surface; 232, protrusion; 2321, first protrusion; 23211, first side edge; 23212, first retaining wall; 2 3213, first guide section; 2322, second protrusion; 23221, second side; 23222, second baffle; 23223, second guide section; 2323, third protrusion; 233, exhaust channel; 2331, fluid convergence area; 234, first edge; 235, second edge; 236, first channel entrance; 237, second channel entrance; 238, recess; 24, tape; 241, first part; 242, second part; 25, pressure relief mechanism; 26, gap; 261, first gap; 262, second gap; X, first direction; Y, third direction; Z, second direction; L1, thickness of support plate; L2, convex height. DETAILED DESCRIPTION

[0095] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0096] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0097] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0098] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0099] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0100] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0101] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0102] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0103] Battery thermal management has become an important factor restricting battery safety performance. In recent years, battery performance requirements have become increasingly higher. High-power fast charging, large-capacity batteries, and complex operating conditions make it possible for batteries to experience thermal runaway during use.

[0104] Usually, thermal runaway will first occur in one of the battery cells. During the long cycle and high rate operation of the battery cells, the battery components will have different degrees of temperature rise. The temperature rise will cause the electrolyte to decompose and produce gas, increase the side reactions of the system, and increase the internal resistance of the battery components, thereby accelerating the attenuation of the battery components and causing the risk of thermal runaway.

[0105] Usually, part of the heat generated by the battery cell assembly during operation is dissipated through the connection with the explosion-proof top cover, and the other part is exchanged between the battery cell assembly and the shell. In related technologies, heat is exchanged between the battery cell assembly and the shell through air, and the heat exchange efficiency is low. There is still much room for improvement in the heat dissipation capacity of the battery cell assembly.

[0106] Therefore, in order to achieve the purpose of rapid heat dissipation of the battery cell assembly, a heat-conducting insulation member is added between the battery cell assembly and the outer shell. The insulation member is installed between the battery cell assembly and the outer shell. When the insulation member is installed between the bottom of the battery cell assembly and the outer shell, the insulation member can also support the battery cell assembly. The insulation member can transfer the heat of the battery cell assembly directly to the outer shell and can perform rapid heat transfer. Therefore, the thermal conductivity performance of the insulation member is crucial.

[0107] When the isolation piece is made of plastic, the thermal conductivity is generally 0.2-0.5w / mk, which is low, and the thermal conductivity is low. The temperature rise inside the battery cell assembly is not sufficiently suppressed, which is not conducive to achieving the purpose of rapid heat dissipation of the battery cell assembly. In addition, the melting point of the plastic material is low, and it will melt during the pressure relief process of the battery cell. The molten isolation piece will accumulate at the pressure relief mechanism, blocking the pressure relief hole, causing poor exhaust, which can easily cause thermal runaway of the battery cell.

[0108] Therefore, using materials with higher thermal conductivity to make insulators to make high thermal conductivity insulators will greatly increase the heat dissipation capacity of the lower part of the battery cell assembly, thereby effectively dissipating the heat generated during the operation of the battery cell assembly, reducing the temperature rise inside the battery cell assembly, increasing the cycle life of the battery cell assembly, and reducing the risk of thermal runaway.

[0109] Based on the above factors, the first aspect of the embodiment of the present application provides a battery cell, which can improve the thermal conductivity between the battery cell assembly and the housing, and improve the heat dissipation capacity of the battery cell assembly; wherein, it should be noted that the battery cell disclosed in the embodiment of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys, electric airplane toys, and the like, and spacecraft can include airplanes, rockets, space shuttles, spacecraft, and the like.

[0110] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0111] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0112] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0113] Please refer to Figure 2 , Figure 2 An exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first component 11 and a second component 12, and the first component 11 and the second component 12 cover each other, and the first component 11 and the second component 12 jointly define a storage space for accommodating the battery cell 20. The second component 12 may be a hollow structure with one end open, and the first component 11 may be a plate-like structure, and the first component 11 covers the open side of the second component 12, so that the first component 11 and the second component 12 jointly define a storage space; the first component 11 and the second component 12 may also be hollow structures with one side open, and the open side of the first component 11 covers the open side of the second component 12. Of course, the box 10 formed by the first component 11 and the second component 12 may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0114] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0115] The battery cell 20 refers to the smallest unit that constitutes the battery. Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular or in other shapes.

[0116] According to some embodiments of the present application, referring to Figure 3 , Figure 3 This is a schematic diagram of the exploded structure of the battery cell 20 provided in some embodiments of the present application, and please refer to Figure 4 , Figure 4 for Figure 3 A partial view is provided to show the inner cavity 2111 and the gap 26. The embodiment of the present application provides a battery cell 20. The battery cell 20 includes a shell 21, a battery cell assembly 22 and an isolating member 23; the shell 21 has an inner cavity 2111, and the shell 21 has a first wall 213; the battery cell assembly 22 is arranged in the inner cavity 2111; the isolating member 23 is arranged between the first wall 213 and the battery cell assembly 22, and the isolating member 23 is respectively in contact with the first wall 213 and the battery cell assembly 22; the isolating member 23 includes a metal layer.

[0117] The outer shell 21 forms the outer shell structure of the battery cell 20, and the outer shell 21 is at least partially hollow to form an inner cavity 2111. The outer shell 21 has a first wall 213, which is one of the wall surfaces of the outer shell 21. The first wall 213 can be at least one of the bottom wall, top wall or side wall of the outer shell 21. The outer shell 21 can be an aluminum shell or other materials.

[0118] The cell assembly 22 is a component in the battery cell 20 where an electrochemical reaction occurs, and the housing 21 may contain one or more cell assemblies 22. The cell assembly 22 is installed in the inner cavity 2111. The cell assembly 22 may be a winding structure or a laminated structure. The cell assembly 22 may be placed in the inner cavity 2111 of the housing 21 through an opening on the housing 21. The cell assembly 22 has a contact surface that contacts the separator 23, and the contact surface may be the bottom surface, the top surface, or any side surface of the cell assembly 22.

[0119] The isolating member 23 is installed in the inner cavity 2111 and is located between the battery cell assembly 22 and the first wall 213. The isolating member 23 abuts against the first wall 213 and the battery cell assembly 22 respectively, wherein the abutting manner includes direct abutment or indirect abutment. Direct abutment means that the surface of the isolating member 23 directly contacts the first wall 213 (or directly contacts the battery cell assembly 22). Indirect abutment means that the isolating member 23 can contact the first wall 213 (or the battery cell assembly 22) with the aid of an intermediate component, that is, the isolating member 23 directly contacts the intermediate component, and the intermediate component directly contacts the first wall 213 (or the battery cell assembly 22). In addition, the abutment range includes full abutment and partial abutment. Full abutment means that the entire abutting surface of the isolating member 23 is completely in contact with the first wall 213 (or the contact surface of the battery cell assembly 22), and partial abutment means that part of the abutting surface of the isolating member 23 or a part of the abutting surface is in contact with the first wall 213 (or the contact surface of the battery cell assembly 22). Therefore, it can be understood that the isolation member 23 abuts against the first wall 213 and the battery cell assembly 22 respectively, which means that the isolation member 23 can have a contact area with the first wall 213 and the battery cell assembly 22 respectively, and the contact method between the isolation member 23 and the first wall 213 and the battery cell assembly 22 can be flexible and changeable.

[0120] The isolation member 23 is disposed between the first wall 213 and the battery cell assembly 22 and can also prevent the battery cell assembly 22 from directly contacting the housing 21 , thereby reducing the risk of short circuit.

[0121] The isolation member 23 may adopt a plate-like structure or a frame structure, etc., and a first surface 2311 in contact with the first wall 213 of the outer shell 21 and a second surface 2312 in contact with the battery cell assembly 22 may be formed on the isolation member 23. The first surface 2311 and the second surface 2312 may be arranged opposite to each other or at an angle; wherein, the length dimension of the first surface 2311 may be equal to or less than the length dimension of the first wall 213, and the width dimension of the first surface 2311 may be equal to or less than the width dimension of the first wall 213, so that the first surface 2311 can fully contact with the first wall 213, and similarly, the length dimension of the second surface 2312 may be equal to or less than the length dimension of the contact surface of the battery cell assembly 22, and the width dimension of the second surface 2312 may be equal to or less than the width dimension of the contact surface of the battery cell assembly 22, so that the second surface can fully contact with the contact surface of the battery cell assembly 22.

[0122] The isolation member 23 includes a metal layer. It is understandable that the metal layer is made of metal material. The isolation member 23 may only include a metal layer. The isolation member 23 may also include a non-metallic layer made of other non-metallic materials while including a metal layer. The metal layer and the non-metallic layer may be prepared by stacking and pressing. When the isolation member only includes a metal layer, it can be known that the metal layer forms the isolation member.

[0123] The metal layer is made of metal materials, and the metal materials have a high thermal conductivity. The metal materials include ferrous metals, non-ferrous metals and special metal materials, etc. In addition, the metal materials may also include alloy materials. The metal materials may specifically include aluminum, iron, magnesium, titanium, copper, zinc, lead, silver, gold, platinum, nickel, alloy materials, etc. Among them, the alloy materials include carbon steel, stainless steel, copper-nickel alloy, iron-nickel alloy, etc.

[0124] In addition to having high heat transfer performance, the metal layer also has the advantage of a high melting point, which makes the separator 23 have high strength and anti-destruction ability. The battery cell 20 is usually provided with a pressure relief mechanism 25, which can be an explosion-proof valve; when gas is generated inside the battery 100, the pressure relief mechanism 25 can control the pressure of the gas inside the battery 100 through its own pressure control device to keep it within a safe range, thereby preventing the battery 100 from exploding, catching fire, and other accidents due to excessive expansion; when gas with excessive pressure is generated inside the battery 100, the pressure relief mechanism 25 will open to release the internal pressure, thereby protecting the battery 100.

[0125] The metal layer has a relatively high melting point, which may be greater than 250 degrees Celsius, so the metal layer may form the heat-resistant portion of the separator 23, and the melting point of the heat-resistant portion may be 251 degrees Celsius, 260 degrees Celsius, 270 degrees Celsius, 304.4 degrees Celsius, 327 degrees Celsius, 340 degrees Celsius, 488 degrees Celsius, 500 degrees Celsius, 600 degrees Celsius, 700 degrees Celsius, 1083.4 degrees Celsius or 1534.8 degrees Celsius, etc. The high melting point of the metal layer can prevent the battery cell 20 from melting and accumulating during pressure relief, and prevent the pressure relief position from being blocked to affect the pressure relief mechanism 25 from performing pressure relief.

[0126] When the isolation piece 23 is installed close to the pressure relief mechanism 25, when the pressure relief mechanism 25 is opened to relieve pressure, the impact pressure generated by the pressure relief will act on the isolation piece 23. When the isolation piece 23 is made of metal material, the isolation piece 23 has higher hardness and strength, so that the isolation piece 23 has enhanced anti-destruction ability and is not easily damaged when impacted. The isolation piece 23 also has a higher melting point, so that the isolation piece 23 is not easy to melt when the pressure is released, and it is not easy to block the pressure relief hole to cause thermal runaway. Compared with the isolation piece 23 made of plastic material that is easy to melt and be damaged by impact, the isolation piece 23 made of metal material in the present application is not easy to be damaged, which is beneficial to extend the service life of the battery 100.

[0127] In one possible embodiment, when the battery cell 20 is assembled, the cell assembly 22 is prepared independently, and the isolation member 23 is installed in the inner cavity 2111 of the outer shell 21 so that the isolation member 23 abuts against the first wall 213 of the outer shell 21, and then the cell assembly 22 is placed in the inner cavity 2111 so that the cell assembly 22 abuts against the isolation member 23.

[0128] The example of the present application configures an isolation member 23 between the first wall 213 and the battery cell assembly 22, and enables the isolation member 23 to contact the first wall 213 and the battery cell assembly 22 respectively, so that a part of the heat generated by the battery cell assembly 22 can be transferred to the outer shell 21 through the isolation member 23, and then diffused to the outside, thereby achieving the purpose of heat transfer and heat conduction to the battery cell assembly 22, which is beneficial to reducing the risk of thermal runaway of the battery cell 20; in addition, the isolation member 23 at least includes an isolation member made of metal material, and the metal material has a high thermal conductivity. The isolation member 23 can increase the thermal conduction rate of the battery cell assembly 22 to achieve the purpose of rapid heat conduction to the battery cell assembly 22; furthermore, the metal material has a high melting point and strong anti-destruction ability. When the pressure relief mechanism 25 is releasing pressure, the isolation member 23 is not easily damaged, which is beneficial to ensure the service life of the battery 100.

[0129] In some examples, the metal layer includes one of aluminum, magnesium, zinc, titanium, nickel, copper and alloys thereof, that is, the metal layer or the isolation member is made of one of aluminum, magnesium, zinc, titanium, nickel, copper and alloys thereof. The alloy refers to an aluminum alloy, a magnesium alloy, a zinc alloy, a titanium alloy, a nickel alloy or a copper alloy.

[0130] For example, the metal layer is made of aluminum material, which has a high thermal conductivity of 237W / (mK). The isolation member 23 can increase the thermal conductivity rate of the battery cell assembly 22 to the outer shell 21, and achieves rapid heat conduction between the battery cell assembly 22 and the outer shell 21. In addition, aluminum is a light metal with light weight, which can reduce the weight of the battery 100 and is conducive to lightweighting of the battery cell 20.

[0131] The aluminum material also has good ductility and strong plastic deformation ability, so that the isolation member 23 can resist the impact force generated when the pressure relief mechanism 25 releases pressure, is not easy to be damaged, and is conducive to ensuring the service life of the battery 100.

[0132] In addition, the aluminum material also has good corrosion resistance. The battery cell 20 contains an electrolyte, which is corrosive, so that the separator 23 can resist corrosion from the electrolyte.

[0133] The formation of alloys can change the physical, chemical and mechanical properties of the metal layer. Through alloying, the hardness, strength, corrosion resistance, thermal stability, conductivity and other properties of the metal layer can be improved. In addition, alloys can also adjust the melting point, expansion coefficient, magnetic properties and other properties of the metal layer, so that the separator 23 can better adapt to the high temperature and corrosive environment inside the battery cell 20.

[0134] In this example, materials such as aluminum, magnesium, zinc, titanium, nickel, copper and their alloys have good thermal conductivity, which can improve the thermal conductivity rate of the battery cell assembly 22 to achieve the purpose of rapid thermal conductivity of the battery cell assembly 22; the above materials also have good ductility and strong plastic deformation ability. The isolation member 23 prepared by the above materials can resist the impact force generated when the pressure relief mechanism 25 releases pressure, and is not easy to be damaged, which is beneficial to ensure the service life of the battery; in addition, the above materials also have good corrosion resistance. There is electrolyte inside the battery cell 20, and the electrolyte is corrosive, and the isolation member 23 prepared by the above materials can resist the corrosion of the electrolyte.

[0135] In some examples, the separator 23 has two side surfaces, and the two side surfaces are respectively arranged toward the first wall 213 and the battery cell assembly 22, and an oxide layer is formed on the surface of at least one of the two side surfaces, and the oxide layer can also be understood as an oxide film. Among them, the oxide layer includes aluminum oxide, magnesium oxide, zinc oxide, titanium oxide, nickel oxide, and copper oxide. The alloy oxide is a compound formed by the reaction of the metal elements in the alloy with oxygen. It can be understood that the oxide layer is specifically one of an aluminum oxide layer, a magnesium oxide layer, a zinc oxide layer, a titanium oxide layer, a nickel oxide layer, a copper oxide layer and an alloy oxide layer. The composition of the oxide layer is determined according to the material of the metal layer.

[0136] The oxide layer is formed by oxidation treatment. Specifically, for metal materials, the oxidation treatment mainly includes anodizing treatment. In the anodizing process, the isolation member 23 acts as an anode and an oxidation reaction is carried out in an electrolyte containing a suitable electrolyte through electrolysis to form a dense oxide layer on the surface of the isolation member 23. The oxide layer is usually called an anodized layer or an anodized film.

[0137] When the separator 23 adopts a plate-like structure, the separator 23 has two opposite and parallel side surfaces, one of which is disposed toward the battery cell assembly 22, and an oxide layer can be independently formed on the side surface; the other side is disposed toward the first wall 213, and an oxide layer can also be independently formed on the side surface; of course, an oxide layer can also be formed on both sides at the same time to increase the area of ​​the oxide layer. The entire surface of the separator 23 can also be oxidized to form an oxide layer on the surface of the separator 23 to simplify the oxidation process.

[0138] In this example, oxidation treatment of the isolation member 23 can improve the insulation performance of the isolation member 23, making it less likely to cause a risk of short circuit between the isolation member 23 and the battery cell assembly 22 and the outer casing 21; in addition, after the oxidation treatment forms an oxide layer, the surface hardness of the isolation member 23 can be increased, thereby improving the damage resistance of the isolation member 23; furthermore, the oxide layer can also improve the corrosion resistance of the isolation member 23. For example, in the event of electrolyte leakage, a protective layer is formed on the surface of the isolation member 23, making the isolation member 23 less susceptible to corrosion.

[0139] In some examples, the battery cell 20 further includes an insulating film 222 wrapped around the outside of the battery cell assembly 22 , and the isolation member 23 abuts against the insulating film 222 . The isolation member 23 is disposed on a side of the insulating film 222 away from the battery cell assembly 22 .

[0140] The insulating film 222 is also called Mylar film. Mylar film is a component in the aluminum shell battery cell. The Mylar film is wrapped around the outside of the battery cell assembly 22. Its function is to prevent the diaphragm of the bare battery cell 221 from being scratched by the aluminum shell during the shelling process. It also prevents the winding core from directly contacting the aluminum shell and plays a role in insulation protection.

[0141] The insulating film 222 is wrapped around the outside of the battery cell assembly 22 to protect the outside of the battery cell assembly 22. It is understandable that the heat generated by the battery cell assembly 22 can be transferred to the Mylar film. Therefore, when the isolation member 23 contacts the battery cell assembly 22, the isolation member 23 will directly abut against the Mylar film, and the isolation member 23 and the Mylar film form a contact area. The heat conductive part absorbs the heat on the Mylar film and then transfers it to the outer shell 21, thereby achieving the purpose of heat conduction and heat dissipation of the battery cell assembly 22 and the Mylar film.

[0142] In some examples, combined Fig.31 and Fig.32 As shown, the insulating film 222 is folded and wrapped around the battery cell assembly 22 to form a first folded edge 2221 and a second folded edge 2222 that overlap each other on the side of the battery cell assembly 22, and a positioning hole 2223 is provided at the portion of the insulating film 222 located between the battery cell assembly 22 and the isolation member 23; the battery cell 20 also includes a tape 24, the tape 24 includes a first portion 241 and a second portion 242 that are connected, the first portion 241 is arranged between the isolation member 23 and the insulating film 222 and covers the positioning hole 2223, and the second portion 242 fixes the first folded edge 2221 and the second folded edge 2222.

[0143] The insulating film 222 is wrapped and arranged outside the battery cell assembly 22 to insulate the battery cell assembly 22 from the housing 21 and the separator 23, etc., respectively, to reduce the risk of short circuit; the insulating film 222 has a first folded edge 2221 and a second folded edge 2222 at the connected position, and the first folded edge 2221 and the second folded edge 2222 are connected in an overlapping manner to reduce the gap at the connection position, so that the insulating film 222 is more tightly closed. The positioning hole 2223 can play a positioning role when the battery cell assembly 22 and the separator 23 are assembled, and improve the accuracy of the installation position of the separator 23 relative to the battery cell assembly 22.

[0144] The tape 24 is connected to the outer surface of the insulating film 222 by bonding. The second part 242 of the tape 24 is mainly used to bond and fix the positions of the first folded edge 2221 and the second folded edge 2222. The first part 241 of the tape 24 can cover the positioning hole 2223, reduce the risk of air leakage and liquid leakage of the insulating film 222, and ensure the insulation and sealing effect of the insulating film 222.

[0145] In this example, the insulating film 222 is wrapped around the outside of the battery cell assembly 22, and is connected on the side by overlapping the first folded edge 2221 and the second folded edge 2222 to improve the sealing of the insulating film 222, and then the first folded edge 2221 and the second folded edge 2222 are bonded by the tape 24 to improve the firmness of the connection between the first folded edge 2221 and the second folded edge 2222, and the positioning hole 2223 is covered by the tape 24 to ensure the insulation and sealing effect of the insulating film 222.

[0146] In some examples, combined Figure 5-Figure 8 As shown, Figure 5 1 shows a front view of a separator 23 in a battery cell 20 in some embodiments of the present application. Figure 6 Shows Figure 5 The AA section view at position A in FIG;

[0147] Figure 7 and Figure 8 Shown respectively about Figure 5 axonometric drawing; Figure 8 for Figure 7 Structural schematic diagram in the rearward direction; in the embodiment of the present application, the battery cell 20 also includes a pressure relief mechanism 25 arranged on the first wall 213, and an exhaust channel 233 is formed on the isolation member 23, and the exhaust channel 233 is connected to the pressure relief mechanism 25.

[0148] The exhaust channel 233 is used on the separator 23 for the airflow in the inner cavity 2111 of the housing 21. Since the separator 23 is disposed between the battery cell assembly 22 and the first wall 213, the exhaust channel 233 can allow the airflow to flow between the battery cell assembly 22 and the first wall 213. The exhaust channel 233 can allow the airflow to flow to the position of the pressure relief mechanism 25. For example, the pressure relief mechanism 25 is connected to or integrally formed on the first wall 213. In the thickness direction of the first wall 213, the pressure relief mechanism 25 is located within the projection plane of the exhaust channel 233. The exhaust channel 233 can allow the airflow to flow from the battery cell assembly 22 to the pressure relief mechanism 25. The airflow carries the heat generated by the battery cell assembly 22 and moves the heat to the pressure relief mechanism 25 in a direction.

[0149] Therefore, on the one hand, the battery cell 20 can isolate the first wall 213 and the battery cell assembly 22 from each other through the isolation member 23, so that the battery cell assembly 22 will not directly abut against the first wall 213 and the pressure relief mechanism 25; on the other hand, due to the setting of the exhaust channel 233 on the isolation member 23, a channel can be formed for the air supply to flow toward the pressure relief mechanism 25, thereby making it easier for the air supply to flow toward the pressure relief mechanism 25, thereby improving the directional fluidity of the gas inside the battery cell 20, and the pressure relief mechanism 25 can be opened in time to release the gas, thereby improving the performance of the pressure relief mechanism 25.

[0150] In this example, the first wall 213 can be any wall surface of the housing 21. For example, the first wall 213 can be the top wall, the bottom wall or any side wall of the housing 21. Figure 3 and Figure 4 As shown, the first wall 213 is the bottom wall, and the pressure relief mechanism 25 is installed on the bottom wall of the housing 21 , thereby achieving the purpose of releasing gas from the bottom of the battery cell 20 . A pressure relief mechanism 25 is provided on the first wall 213, and the isolation member 23 is arranged between the first wall 213 and the battery cell assembly 22. On the one hand, the isolation member 23 isolates the battery cell assembly 22 from the outer shell 21, reduces the possibility of contact between the battery cell assembly 22 and the outer shell 21, and makes the battery cell assembly 22 no longer abut against the pressure relief mechanism 25, thereby improving the pressure relief effect of the pressure relief mechanism 25; on the other hand, the isolation member 23 supports the battery cell assembly 22 at the bottom of the battery cell assembly 22, thereby reducing the extrusion deformation of the battery cell assembly 22 on the outer shell 21; on the other hand, an exhaust channel 233 is opened on the isolation member 23, so that the heat generated by the battery cell assembly 22 can flow along the exhaust channel 233 through the fluid to the position of the pressure relief mechanism 25 on the first wall 213, and then the pressure relief mechanism 25 can be used to control the airflow, so as to improve the pressure relief effect of the pressure relief mechanism 25 when the battery cell 20 has a risk of thermal runaway.

[0151] The pressure relief mechanism 25 can adopt an explosion-proof valve or a pressure relief valve, etc. The pressure relief mechanism 25 is an installation device used for explosion-proofing the battery 100. Its working principle is to monitor the internal pressure changes of the battery cell 20. When the pressure rises to a certain level, the pressure relief mechanism 25 opens to release the pressure, thereby reducing the risk of explosion of the battery cell 20.

[0152] Under normal use, the pressure inside the battery cell 20 is low, the pressure relief mechanism 25 remains closed, and no gas leaks. When the battery cell 20 experiences abnormal conditions such as overcharging, over-discharging, internal short circuit, etc., a large amount of gas will be generated inside the battery cell 20, causing the pressure to rise sharply. A load switch or metal diaphragm is installed inside the pressure relief mechanism 25. When the pressure inside the battery cell 20 rises to a certain level, the switch will be closed or the metal diaphragm will be deformed by force. When the switch is closed or the metal diaphragm is deformed, the pressure relief mechanism 25 opens, allowing the gas generated inside the battery cell 20 to be released quickly, thereby reducing the pressure inside the battery cell 20. By releasing the gas, the internal pressure of the battery cell 20 returns to the normal range, and the pressure relief mechanism 25 is closed. The pressure relief mechanism 25 can effectively reduce the risk of explosion caused by excessive internal pressure of the battery cell 20.

[0153] Therefore, it can be known that the pressure relief mechanism 25 is mainly used to release gas, and the exhaust channel 233 is used to allow the airflow (or gas) to flow to a position opposite to the pressure relief mechanism 25. Therefore, it can be understood that the gas is released in the battery cell 20, and the gas flows through the exhaust channel 233 to the position of the pressure relief mechanism 25, and gathers at the position of the pressure relief mechanism 25. When the pressure reaches the preset pressure, the pressure relief mechanism 25 opens to quickly release the gas in the battery cell 20, so as to reduce the problem of explosion of the battery cell 20 caused by thermal runaway.

[0154] In this example, the gas carries the heat generated by the battery cell assembly 22 into the exhaust channel 233, and is guided through the exhaust channel 233 to flow to the location of the pressure relief mechanism 25. By installing the pressure relief mechanism 25 on the first wall 213 of the outer shell 21, the exhaust channel 233 is connected to the pressure relief mechanism 25. Then, the gas in the exhaust channel 233 can flow to the pressure relief mechanism 25, and the pressure relief mechanism 25 can open to release the gas, ensuring that the pressure in the battery cell 20 is maintained within a reasonable range, which is beneficial to improving the gas diversion effect and can also improve the performance of the pressure relief mechanism 25.

[0155] In some examples, the exhaust channel 233 is a channel for air flow arranged on the surface of the isolation member 23; in some examples, the exhaust channel 233 is a channel penetrating the interior of the isolation member 23, and the end of the channel is connected to the surface of the isolation member 23; in some examples, the exhaust channel 233 is partially penetrated through the interior of the isolation member 23, and is partially arranged on the surface of the isolation member 23.

[0156] The number of the exhaust channel 233 in this example may be one, or the number of the exhaust channel 233 may be multiple. Fig.10 and Fig.11 As shown, when the isolation member 23 has a plurality of exhaust channels 233 , the plurality of exhaust channels 233 may be independently arranged, or the plurality of exhaust channels 233 may be interconnected.

[0157] The example of the present application can reduce the obstruction of the airflow by the isolation member 23 disposed between the first wall 213 and the battery cell assembly 22 by providing an isolation member 23 in the inner cavity 2111, and installing the isolation member 23 between the battery cell assembly 22 and the first wall 213 of the outer shell 21, so as to improve the reliability of the battery cell 20 by using the exhaust channel 233 of the isolation member 23 as a passage for air flow.

[0158] In some examples, combined Figure 3-5 and Figure 7 As shown, the exhaust passage 233 communicates with an edge of the partition 23 in the first direction X, and the first direction X intersects with the thickness direction of the first wall 213 .

[0159] The thickness direction of the first wall 213 in this example can be as follows Figure 4 The second direction Z in the example intersects with the thickness direction of the first wall 213, which means that the first direction X is not parallel to the thickness direction of the first wall 213. Optionally, the first direction X can be perpendicular to the thickness direction of the first wall 213. When the first wall 213 is the bottom wall, the second direction Z can be understood as the height direction of the housing 21.

[0160] The edge of the isolating member 23 in the first direction X may be any edge of the isolating member 23 in the first direction X. In some examples, the isolating member 23 is a rectangular plate, and the isolating member 23 has a length direction and a width direction. The edge of the isolating member 23 in the first direction X may refer to at least one edge of the isolating member 23 in the length direction or the width direction.

[0161] See also Figure 7 The exhaust channel 233 is connected to the edge of the isolation member 23 in the first direction X, which means that the exhaust channel 233 has at least two openings, and the two openings can be understood as the first channel inlet 236 and the second channel inlet 237 described below.

[0162] In this example, the first direction X intersects with the thickness direction of the first wall 213. The exhaust channel 233 is connected to the edge of the isolation member 23 in the first direction X, so that the airflow outside the edge of the isolation member 23 in the first direction X can flow along the exhaust channel 233 to the position where the pressure relief mechanism 25 is located, thereby reducing the problem of local heating at the edge of the isolation member 23 in the first direction X due to blocked airflow.

[0163] In some examples, combined Figure 5-Figure 8As shown, the housing 21 further includes a second wall 214 , which is connected to the first wall 213 . A gap 26 is formed between the second wall 214 and the outer peripheral surface of the battery cell assembly 22 , and the gap 26 is connected to the exhaust channel 233 .

[0164] The second wall 214 in this example may be any wall surface on the housing 21 except the first wall 213. Taking the first wall 213 as the bottom wall of the housing 21 as an example, the second wall 214 may be a side wall or a top wall of the housing 21. In some embodiments, the second wall 214 may be a wall directly connected to the first wall 213, for example, the second wall 214 is a side wall of the housing 21, or the second wall 214 is a part of the side wall of the housing 21.

[0165] The outer peripheral surface of the battery cell assembly 22 in this example refers to the surface of the battery cell assembly 22 facing the second wall 214. A gap 26 is formed between the outer peripheral surface of the battery cell assembly 22 and the second wall 214 to facilitate airflow. The exhaust channel 233 is connected to the gap 26, which means that at least one opening (specifically, the channel inlet) of the exhaust channel 233 is connected to the gap 26, and the airflow in the gap 26 can flow along the exhaust channel 233 to the position where the pressure relief mechanism 25 is located. The opening can be understood to include a first channel inlet 236 and a second channel inlet 237, and the first channel inlet 236 and the second channel inlet 237 are both connected to the gap 26.

[0166] In this example, by forming the gap 26, on the one hand, a space for air flow can be formed on the outer peripheral surface of the battery cell assembly 22. During the flow of air, the flowing air can bring the heat generated by the outer peripheral surface of the battery cell assembly 22 to the exhaust channel 233, thereby improving the cooling performance of the outer peripheral surface of the battery cell assembly 22 and reducing the possibility of local temperature rise on the outer peripheral surface of the battery cell assembly 22; on the other hand, as the air flow flows from the gap 26 to the exhaust channel 233, the temperature of the second wall 214 near the outer peripheral surface of the battery cell assembly 22 can be reduced by the flow of air, thereby reducing the possibility of deformation of the second wall 214 near the outer periphery of the battery cell assembly 22.

[0167] In this example, the gap 26 can be connected through an exhaust channel 233; in some examples, the exhaust channel 233 on the isolation member 23 can form a plurality of sub-exhaust channels, each of which can form a channel entrance connected to the gap 26, so that the gap 26 can be connected to a plurality of sub-gaps 26.

[0168] In some examples, combined Figure 5-Figure 13 As shown, Fig.13A schematic diagram of the flow direction of airflow in a battery cell 20 provided in some embodiments of the application is shown, wherein the edges of the isolation member 23 in the first direction X include a first edge 234 and a second edge 235, and the gap 26 is connected to the exhaust channel 233 at the first edge 234 and the second edge 235, respectively.

[0169] Combined Figure 4 , Fig.13 and Fig.14 As stated, Fig.14 A cross-sectional view of a battery cell 20 provided in an embodiment of the present application along a first direction X is shown; the first edge 234 and the second edge 235 are two edges of the isolation member 23 in the first direction X, so it can be known that the first edge 234 and the second edge 235 can be two corresponding open ends in the length or width direction of the isolation member 23, and the two open ends respectively form a first channel inlet 236 and a second channel inlet 237 connecting the gap 26, and the gap 26 is connected to the exhaust channel 233 through the first channel inlet 236 and the second channel inlet 237 respectively.

[0170] It is understandable that the exhaust channel 233 has a first channel inlet 236 and a second channel inlet 237 , which are respectively arranged at two ends of the exhaust channel 233 along the first direction X; the first channel inlet 236 and the second channel inlet 237 are respectively connected to the exhaust channel 233 .

[0171] The first channel inlet 236 and the second channel inlet 237 are different inlets for the fluid to enter the exhaust channel 233 , so that the airflow can enter the exhaust channel 233 through multiple positions and multiple directions, which can improve the flow guiding capacity of the exhaust channel 233 .

[0172] The first channel inlet 236 and the second channel inlet 237 can be arranged in multiple directions of the isolation member 23, but when the first channel inlet 236 and the second channel inlet 237 are respectively arranged at the two ends of the exhaust channel 233 along the first direction X, it can be known that the exhaust channel 233 can at least guide the fluid in two opposite directions. For example, when the isolation member 23 (specifically the support plate 231 described below) has a first edge 234 and a second edge 235, the first channel inlet 236 and the second channel inlet 237 can be respectively arranged at the two ends of the isolation member 23 (specifically the support plate 231 described below) in the first direction X, that is, the first The channel inlet 236 is arranged at the first edge 234 of the isolation member 23 (specifically, the support plate 231 described below), and the second channel inlet 237 is arranged at the second edge 235 of the isolation member 23 (specifically, the support plate 231 described below). The fluid entering through the first channel inlet 236 and the fluid entering through the second channel inlet 237 can flow toward the middle area of ​​the exhaust channel 233. The middle area can be understood as a position opposite to the pressure relief mechanism 25. The middle area forms a fluid convergence area 2331 for converging the fluid, so that the pressure relief mechanism 25 can be arranged on the first wall 213 opposite to the fluid convergence area 2331.

[0173] In this example, by configuring the first channel inlet 236 and the second channel inlet 237 opposite to each other along the first direction X on the isolation member 23, the fluid entering the exhaust channel 233 from the first channel inlet 236 and the fluid entering the exhaust channel 233 from the second channel inlet 237 can move toward each other and converge at the position where the fluids meet, so that the fluids can flow to the position where the pressure relief mechanism 25 is located in a convergent manner, thereby improving the flow conduction capacity of the isolation member 23 and facilitating improving the performance of the pressure relief mechanism 25.

[0174] In some examples, a plurality of first channel inlets 236 are provided, and the inlet directions of the plurality of first channel inlets 236 may be the same or different.

[0175] By configuring multiple first channel inlets 236, the paths for gas to flow into the exhaust channel 233 can be increased. Multiple first channel inlets 236 can connect different areas within the gap 26, thereby increasing the number of connecting positions between the gap 26 and the exhaust channel 233, which is beneficial to increasing the guidance effect of the exhaust channel 233 and improving the guidance efficiency.

[0176] Likewise, in some examples, a plurality of second channel inlets 237 are provided, and the inlet directions of the plurality of second channel inlets 237 may be the same or different.

[0177] By configuring multiple second channel inlets 237, the paths for gas to flow into the exhaust channel 233 can be increased. Multiple second channel inlets 237 can connect different areas within the gap 26, thereby increasing the number of connecting positions between the gap 26 and the exhaust channel 233, which is beneficial to increasing the guidance effect of the exhaust channel 233 and improving the guidance efficiency.

[0178] Optionally, in some examples, a plurality of first channel inlets 236 and a plurality of second channel inlets 237 may be provided respectively, and the plurality of first channel inlets 236 and the plurality of second channel inlets 237 can connect different areas within the gap 26, thereby increasing the paths for gas to flow into the exhaust channel 233, thereby increasing the number of connecting positions between the gap 26 and the exhaust channel 233, and thereby increasing the flow guidance effect of the exhaust channel 233 and improving the flow guidance efficiency.

[0179] In some examples, combined Fig.13 and Fig.14 As shown, the gap 26 includes a first gap 261 and a second gap 262. The first gap 261 is connected to the exhaust channel 233 via the first edge 234, and the second gap 262 is connected to the exhaust channel 233 via the second edge 235. That is, the first edge 234 forms a first channel inlet 236 connected to the exhaust channel 233, and the second edge 235 forms a second channel inlet 237 connected to the exhaust channel 233. The first gap 261 is connected to the exhaust channel 233 via the first channel inlet 236, and the second gap 262 is connected to the exhaust channel via the second channel inlet 237.

[0180] The second wall 214 may include two second sub-walls, a first gap 261 is formed between one second sub-wall and the surface of the battery cell assembly 22, and a second gap 262 is formed between the other second sub-wall and the surface of the battery cell assembly 22. The first gap 261 and the second gap 262 together form a gap 26.

[0181] Among them, the two second sub-walls can be two oppositely configured side walls of the outer shell 21. For example, the battery cell assembly 22 is cylindrical, and the battery cell assembly 22 has two groups of side walls configured opposite to each other. Correspondingly, the outer shell 21 is also cylindrical, and the outer shell 21 has two groups of oppositely configured inner walls, wherein one group of oppositely configured inner walls is the two second sub-walls. After the battery cell assembly 22 is accommodated in the inner cavity 2111 of the outer shell 21, a second sub-wall and a side wall of the battery cell assembly 22 form a first gap 261, and the other second sub-wall and a side wall of the battery cell assembly 22 form a second gap 262. The first gap 261 may be connected to the second gap 262 or not.

[0182] The first gap 261 is connected to the first channel inlet 236 so that the gas in the first gap 261 can enter the exhaust channel 233 through the first channel inlet 236 . The second gap 262 is connected to the second channel inlet 237 so that the gas in the second gap 262 can enter the exhaust channel 233 through the second channel inlet 237 .

[0183] In this example, the gas generated by the battery cell assembly 22 can enter the first gap 261 and the second gap 262 respectively. The first gap 261 and the second gap 262 are located outside a portion of the surface of the battery cell assembly 22. After the first gap 261 and the second gap 262 are connected to the airflow channel, the airflow flows in a directed manner in the first gap 261 and the second gap 262, which also plays a role in guiding the airflow.

[0184] In some examples, combined Figure 7 As shown, the isolation member 23 includes a support plate 231 and a plurality of protrusions 232 . The support plate 231 has a first surface 2311 . The plurality of protrusions 232 are connected to the first surface 2311 and surround an exhaust passage 233 .

[0185] The support plate 231 is the main structure of the isolation member 23 and is installed between the battery cell assembly 22 and the first wall 213. The first surface 2311 is a surface of the support plate 231 in the thickness direction (second direction Z). The support plate 231 can be a flat plate-shaped structural member.

[0186] A plurality of protrusions 232 are connected on the first surface 2311 to form an exhaust channel 233, which can fully utilize the surface of the support plate 231 to increase the total area of ​​the exhaust channel 233 and the flow space of the airflow, thereby improving the fluidity of the airflow.

[0187] The plurality of protrusions 232 are connected to the first surface 2311 of the isolation member 23 and are spaced apart at preset positions on the first surface 2311 so that a spacing space is formed between two adjacent protrusions 232 . The plurality of spacing spaces are connected to form an exhaust channel 233 .

[0188] The shape of the protrusion 232 can be selected according to the specific situation. The protrusion 232 can be a rectangular parallelepiped, a cylinder, an annular body or a combination of multiple shapes; the convex height L2 of the protrusion 232 can be the same or different, wherein the convex height L2 of the protrusion 232 is the thickness of the protrusion 232, and the convex end surface of the protrusion 232 is the contact surface. When the protrusion 232 is located on the side of the support plate facing the battery cell assembly 22, the convex end surface of the protrusion 232 is in contact with the battery cell assembly 22; when the protrusion 232 is located on the side of the support plate 231 facing the first wall 213, the convex end surface of the protrusion 232 is in contact with the first wall 213. It should be noted that when the protrusion 232 is located on the side of the support plate 231 facing the battery cell assembly 22, the exhaust channel 233 is also formed on the side of the support plate 231 facing the battery cell assembly 22, and a hole structure connecting the exhaust channel 233 and the first wall 213 needs to be opened on the support plate 231 so that the airflow can flow to the first wall 213 through the exhaust channel 233.

[0189] The protrusions 232 play a supporting role between the battery cell assembly 22 and the first wall 213, so that the airflow can flow toward the location of the pressure relief mechanism 25 through the spacing between the protrusions 232. One or more exhaust channels 233 can be formed between the multiple protrusions 232, or the multiple protrusions 232 are spaced and staggered to form multiple intersecting and staggered exhaust channels 233.

[0190] The plurality of protrusions 232 may form a plurality of support positions on the first surface 2311 to disperse the force acting on the support plate 231, thereby reducing deformation of the support plate 231 due to stress concentration, and reducing the possibility of deformation of the support plate 231. The plurality of protrusions 232 may be arranged on the first surface 2311 in a regular arrangement, and the regular arrangement means that the plurality of protrusions 232 are regularly distributed along a preset direction, thereby forming a relatively regular exhaust channel 233 on the first surface 2311.

[0191] In some examples, combined Figure 6 As shown, the thickness L1 of the support plate 231 is 0.4 mm-0.8 mm.

[0192] The support plate 231 may be a flat plate structure, and the support plate 231 is used to stamp out the protrusion 232, so the thickness of the protrusion 232 should not be too thick to affect the stamping effect. In addition, if the thickness of the support plate 231 is too thick, the larger the space occupied by the inner cavity 2111, the smaller the volume of the battery cell assembly 22 will be, which will easily lead to a decrease in the energy density of the battery cell 20; however, the support plate 231 needs to play a supporting and supporting role between the battery cell assembly 22 and the first wall 213. In order to improve the deformation resistance of the support plate 231, the thickness L1 of the support plate 231 should not be too thin. Therefore, the thickness L1 of the support plate 231 can be selected from 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc. Of course, the thickness L1 of the support plate 231 can also be any other value within the above range.

[0193] In some examples, combined Figure 6 As shown, the outer protrusion height L2 of the protrusion 232 is 0.4 mm-0.8 mm.

[0194] When the support plate 231 is in the shape of a flat plate, the heights of the protrusions 232 can be the same, so that the convex end surfaces of the protrusions 232 can be located on the same plane, so that the convex end surfaces of the protrusions 232 can fit with the first wall 213. The convex height L2 of the protrusions 232 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, etc.

[0195] The higher the outward protrusion height L2 of the raised portion 232, the larger the space of the exhaust channel 233. However, the higher the height of the support plate 231, the larger the space occupied by the inner cavity 2111. Then, the volume of the battery cell assembly 22 will be reduced accordingly, which will easily lead to a decrease in the energy density of the battery cell 20. Therefore, the outward protrusion height L2 of the raised portion 232 can be selected to be 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc. Of course, the outward protrusion height L2 of the raised portion 232 can also be any other value within the above-mentioned range.

[0196] In some examples, the protrusion 232 is integrally formed on the support plate 231 .

[0197] The raised portion 232 is connected to the first surface 2311 of the support plate 231 and is formed integrally with the support plate 231 . For example, the isolation member 23 is a stamped component, and the raised portion 232 protruding from the surface of the support plate 231 is formed by stamping on the support plate 231 .

[0198] During the preparation of the isolation member 23, an integrated stamping method can be adopted to ensure the structural strength. Multiple protrusions 232 are stamped at one time to ensure that the protruding height L2 of each protrusion 232 is the same, and the protruding end surface of the protrusion 232 can be fitted with the surface of the first wall 213 or the battery cell assembly 22, thereby reducing the generation of gaps, ensuring the heat conduction area, and improving the heat conduction effect.

[0199] In some examples, combined Figure 3 , Figure 4 , Figure 7 and Figure 8 As shown, the first surface 2311 is disposed toward the first wall 213 .

[0200] The support plate 231 has a first surface 2311 disposed toward the first wall 213 , and the protrusion 232 protrudes outward from the first surface 2311 toward the first wall 213 .

[0201] The support plate 231 is in the shape of a flat plate. Along the thickness direction of the support plate 231, the support plate 231 has a first surface 2311 and a second surface 2312 opposite to the first surface 2311. The first surface 2311 faces the first wall 213, and the second surface 2312 faces the battery cell assembly 22. The second surface 2312 can contact the battery cell assembly 22 so that the support plate 231 can directly absorb the heat from the battery cell assembly 22.

[0202] The protrusion 232 is formed on the first surface 2311 , and the protrusion 232 is formed by protruding the first surface 2311 by a preset height. That is, the protrusion 232 protrudes toward the first wall 213 so that the convex end surface of the protrusion 232 contacts the first wall 213 .

[0203] The exhaust channel 233 is formed on the surface of the support plate 231 facing the first wall 213, and the first wall 213 of the outer shell 21 abuts against the convex end surface of the protrusion 232. It can be seen that the airflow can also transfer part of the heat directly to the outer shell 21 during the circulation in the exhaust channel 233, thereby improving the heat dissipation path through the outer shell 21, which is beneficial to improving the heat dissipation efficiency and reducing the risk of thermal runaway.

[0204] In this example, the isolation member 23 is arranged between the first wall 213 and the battery cell assembly 22, so that the protrusion 232 is arranged toward the first wall 213, so that the support plate 231 can contact the battery cell assembly 22 for heat conduction, and at the same time, the air flow can be conducted to the outer shell 21 in the exhaust channel 233, thereby enhancing the heat dissipation effect of the outer shell 21 and improving the heat dissipation efficiency.

[0205] In some examples, combined Figure 5 and Figure 7 and Figure 8As shown, the support plate 231 has a first edge 234 and a second edge 235 opposite to each other along a first direction X, and the plurality of protrusions 232 include at least a first protrusion 2321 and a second protrusion 2322. The first protrusion 2321 and the second protrusion 2322 both extend along the first direction X and are located between the first edge 234 and the second edge 235. The first protrusion 2321 and the second protrusion 2322 are spaced apart in a third direction Y to form an exhaust channel 233, and the third direction Y is perpendicular to the first direction X; the first direction X is a direction perpendicular to the thickness of the support plate 231.

[0206] Reference Figure 7 As shown, the second direction Z is the direction of the thickness of the support plate 231, the first direction X may be a direction perpendicular to the thickness of the support plate 231, the third direction Y is also a direction perpendicular to the thickness of the support plate 231, and the first direction X is perpendicular to the third direction Y. For example, when the support plate 231 is a rectangular plate, the first direction X is the length direction of the support plate 231, the third direction Y is the width direction of the support plate 231, and the second direction Z is the height direction of the shell 21; the edge may refer to the edge of the support plate 231 in the length direction or the width direction, and the first edge 234 and the second edge 235 may be two opposite edges of the support plate 231 in the length direction, or two opposite edges of the support plate 231 in the width direction.

[0207] The multiple protrusions 232 include at least one first protrusion 2321 and one second protrusion 2322, wherein the first protrusion 2321 and the second protrusion 2322 are located between the first edge 234 and the second edge 235, and the third direction Y is perpendicular to the extension direction of the first protrusion 2321 and the second protrusion 2322. In the third direction Y, a spacing space is formed between the first protrusion 2321 and the second protrusion 2322, and the spacing space forms the exhaust channel 233.

[0208] The exhaust channel 233 may be in a straight line or a curve between the first edge 234 and the second edge 235 , wherein the curve includes an arc curve, a bending curve, etc. The exhaust channel 233 may be in a regular shape or an irregular shape.

[0209] For example, when the support plate 231 is a rectangular plate, refer to Figure 5 As shown, the first edge 234 and the second edge 235 are two edges of the support plate 231 that are opposite to each other in the length direction. The first protrusion 2321 and the second protrusion 2322 can both extend along the length direction of the support plate 231 and form a rectangular protrusion end surface, and both ends of the first protrusion 2321 and the second protrusion 2322 extend to the first edge 234 and the second edge 235; the first protrusion 2321 and the second protrusion 2322 can be formed by stamping or bending, refer to Fig. 9As shown, the first protrusion 2321 and the second protrusion 2322 are respectively formed by bending the two edges of the support plate 231 perpendicular to the first direction X. The two edges along the first direction X can be width directions, and the two edges are arranged opposite to each other in the first direction. The bending method is adopted so that the isolation member 23 can be integrally formed as a whole, and the isolation member 23 has higher overall rigidity and better supporting stability.

[0210] On the surface of the support plate 231, a spacing space is formed between the first protrusion 2321 and the second protrusion 2322, and the spacing space is the exhaust channel 233. It can be understood that at least one opening of the exhaust channel 233 is connected to the first edge 234, and at least one opening of the exhaust channel 233 is connected to the second edge 235. The opening located at the first edge 234 and the opening located at the second edge 235 can both be the entrances of the exhaust channel 233, that is, the first channel entrance 236 and the second channel entrance 237. Then, the pressure relief mechanism 25 located on the first wall 213 can be relatively configured in any area of ​​the spacing space between the first protrusion 2321 and the second protrusion 2322. For example, the pressure relief mechanism 25 is configured in the middle area of ​​the exhaust channel 233 in the first direction X.

[0211] For another example, when the support plate 231 is a rectangular plate, refer to Figure 10-12 As shown, the first edge 234 and the second edge 235 are the edges at both ends along the width direction respectively, and the first protrusion 2321 and the second protrusion 2322 can both extend along the width direction of the support plate 231 and form a rectangular protrusion end face; the first protrusion 2321 and the second protrusion 2322 form a group, and a plurality of groups of first protrusions 2321 and second protrusions 2322 spaced apart in the third direction Y can be formed on the surface of the support plate 231, and an exhaust channel 233 is formed between the first protrusion 2321 and the second protrusion 2322 in each group, then a plurality of exhaust channels 233 can be formed on the surface of the support plate 231, and the plurality of exhaust channels 233 are spaced apart, and each exhaust channel 233 forms a first channel inlet 236 and a second channel inlet 237, and by configuring a plurality of exhaust channels 233, the ability of flow diversion can be enhanced, which is beneficial to improving the flow diversion efficiency.

[0212] In this example, by providing the first protrusion 2321 and the second protrusion 2322, the interval space between the first protrusion 2321 and the second protrusion 2322 forms an exhaust channel 233, so that the airflow can flow into the exhaust channel 233 from the inlet formed between the extension end of the first protrusion 2321 and the extension end of the second protrusion 2322, and flow along the exhaust channel 233 to the position where the pressure relief mechanism 25 is located, thereby guiding and draining the airflow, reducing local airflow aggregation, and reducing the problem of excessive local temperature rise.

[0213] In some examples, combined Figure 5 As shown, the first protrusion 2321 and the second protrusion 2322 both extend from the first edge 234 to the second edge 235 along the first direction X. It can be seen that the exhaust channel 233 passes through from the first edge 234 to the second edge 235, and the exhaust channel 233 forms entrances at the positions of the first edge 234 and the second edge 235, respectively. The entrances can be understood as the first channel entrance 236 and the second channel entrance 237 described below.

[0214] In this example, an inlet is formed at the first edge 234 and the second edge 235 of the exhaust channel 233, so that the airflow can flow into the exhaust channel 233 from the first edge 234 and the second edge 235, and flow along the exhaust channel 233 to the position where the pressure relief mechanism 25 is located, thereby guiding and draining the airflow, reducing local airflow aggregation, and reducing the problem of excessive local temperature rise.

[0215] In some examples, combined Figure 15-Figure 20 As shown, Fig.15 Schematic diagrams of the exploded structure of battery cells 20 of other embodiments of the present application are shown; Fig.16 A front view of a separator 23 in a battery cell 20 in some other embodiments of the present application is shown; Fig.17 Shows Fig.16 BB section view in; Fig.18 and Fig.19 They are shown respectively Fig.16 axonometric drawing; Fig.19 for Fig.18 Rear view of Fig. 20 A schematic diagram of the flow direction of airflow in a battery cell 20 provided in some other embodiments of the present application is shown; the multiple protrusions 232 also include multiple third protrusions 2323 located between the first protrusion 2321 and the second protrusion 2322, some of the third protrusions 2323 are located at the first edge 234 and are jointly arranged with the first protrusion 2321 and the second protrusion 2322 to form multiple channel entrances, and the remaining third protrusions 2323 are located at the second edge 235 and are jointly arranged with the first protrusion 2321 and the second protrusion 2322 to form multiple channel entrances.

[0216] A spacing space is formed between the first protrusion 2321 and the second protrusion 2322, and the third protrusion 2323 is between the first protrusion 2321 and the second protrusion 2322. It can be seen that the third protrusion 2323 is located in the spacing space, and the third protrusion 2323 divides the spacing space so that the original overall exhaust channel 233 is divided into multiple sub-exhaust channels.

[0217] Since a third protrusion 2323 extends from the first edge 234 toward the second edge 235, it can be seen that the third protrusion 2323 allows the exhaust channel 233 to form two openings at the first edge 234, and the openings can be understood as the entrances of the exhaust channel 233. That is to say, by providing the third protrusion 2323, the exhaust channel 233 forms at least two channel entrances at the first edge 234. When a plurality of third protrusions 2323 are provided, the exhaust channel 233 can form a plurality of channel entrances on the first edge 234 to divert the fluid. Similarly, another third protrusion 2323 extends from the second edge 235 toward the first edge 234. It can be seen that the third protrusion 2323 allows the exhaust channel 233 to form two openings at the second edge 235, and the openings can be understood as the entrances of the exhaust channel 233. That is to say, combined with Fig.18 and Fig. 20 As shown, by setting another third protrusion 2323, the exhaust channel 233 forms at least two channel inlets on the second edge 235, and both channel inlets are connected to the gap 26. When there are multiple third protrusions 2323, the exhaust channel 233 can form multiple channel inlets on the second edge 235 to divert the fluid.

[0218] When the third protrusion 2323 separates the interval space between the first protrusion 2321 and the second protrusion 2322 into two sub-exhaust channels, a connecting hole can be opened on the third protrusion 2323 to connect the two sub-exhaust channels so that the fluid in the two sub-exhaust channels can flow toward the location of the pressure relief mechanism 25.

[0219] In this example, by setting a plurality of third protrusions 2323, the exhaust channel 233 forms at least two channel entrances on the first edge 234, and the exhaust channel 233 forms at least two channel entrances on the second edge 235, so as to achieve the purpose of diverting the airflow, and by forming a plurality of channel entrances, the airflow can enter the exhaust channel 233 from multiple directions, thereby increasing the ability to converge and guide the airflow, which is beneficial to improving the fluidity of the airflow and improving the thermal conductivity and heat dissipation capabilities of the isolation member 23.

[0220] In some examples, combined Fig.16 and Fig.18 and Fig.19 As shown, along the first direction X, the plurality of third protrusions 2323 are arranged at intervals, and the pressure relief mechanism 25 is disposed relative to the interval area between the plurality of third protrusions 2323 .

[0221] For example, there is a midpoint between the first edge 234 and the second edge 235, and when the length of the third protrusion 2323 located at the first edge 234 extending from the first edge 234 is less than half of the length between the first edge 234 and the second edge 235, the extending end of the third protrusion 2323 forms a spacing segment with the midpoint. Similarly, when the length of the third protrusion 2323 located at the second edge 235 extending from the second edge 235 is less than half of the length between the first edge 234 and the second edge 235, the third protrusion 2323 is The extending end of the protrusion 2323 forms a spacing section with the midpoint position. Therefore, it can be known that the two third protrusions 2323 form a spacing area at the midpoint position, and the spacing area can be used to converge the airflow flowing in from the first edge 234 and the second edge 235, so that the airflow converges in the spacing area to form a fluid convergence area 2331. Then, a pressure relief mechanism 25 can be set at a position of the first wall 213 opposite to the spacing area (or fluid convergence area 2331) to achieve a better pressure relief effect and avoid the third protrusion 2323 blocking the pressure relief mechanism 25.

[0222] In this example, by controlling the extension length of the third protrusion 2323, the third protrusion 2323 extending from the first edge 234 and the third protrusion 2323 extending from the second edge 235 form a spacing area between the extension ends. The spacing area can be used to converge the airflows flowing in from the first edge 234 and the second edge 235 respectively, thereby playing a role in converging the airflow, so as to achieve the purpose of diversion and convergence, and provide a basis for the subsequent setting of the position of the pressure relief mechanism 25, so as to improve the pressure relief effect.

[0223] In some examples, combined Figure 8 , Fig.19 and the following Fig.24 As shown, the support plate 231 has a second surface 2312 disposed opposite to the first surface 2311 , and a recess 238 is formed on the second surface 2312 .

[0224] The support plate 231 is configured between the battery cell assembly 22 and the first wall 213, the first surface 2311 is set toward the first wall 213, and the second surface 2312 is configured toward the battery cell assembly 22. The recess 238 is formed on the second surface 2312 of the support plate 231, that is, the recess 238 is configured toward the battery cell assembly 22.

[0225] The recess 238 may adopt a groove structure formed on the second surface 2312 of the support plate 231. The recess 238 may be arranged in any direction on the second surface 2312. A plurality of recesses 238 may be provided, and the plurality of recesses 238 may be parallel or intersecting. The recess 238 may be used to reduce the weight of the support plate 231, thereby achieving lightweighting of the support plate 231. The recess 238 may also penetrate from the first edge 234 to the second edge 235 on the second surface 2312 to form a through groove structure.

[0226] In this example, the recess 238 forms a groove structure on the second surface 2312 to reduce the overall weight of the support plate 231 by removing material from the second surface 2312 , which is beneficial to achieving lightweighting of the support plate 231 .

[0227] In some examples, combined Figure 8 , Fig.19 and the following Fig.24 As shown, the recesses 238 and the protrusions 232 are arranged one by one in the thickness direction of the support plate 231; for example, the number of the recesses 238 is the same as the number of the protrusions 232, and a recess 238 and a protrusion 232 are arranged opposite to each other.

[0228] When the support plate 231 and the protrusion 232 are stamped structural parts formed by integral stamping, the concave portion 238 can be a stamping groove formed on the back of the protrusion 232 when the protrusion 232 is stamped. It can be seen that the number of the stamping grooves is the same as the number of the protrusions 232, and one stamping groove is arranged opposite to one protrusion 232. In this way, the support plate 231 and the protrusion 232 are integrally stamped.

[0229] In some examples, combined Figure 3 , Figure 4 , Fig.15 and the following Fig.21 As shown, the outer shell 21 includes a shell body 211 and an end cover 212. The shell body 211 is provided with a receiving opening 2112. The end cover 212 is connected to the shell body 211 and covers the receiving opening 2112. The first wall 213 is the wall of the shell body 211 or the end cover 212. It can be known that the pressure relief mechanism 25 can be connected to the shell body 211 or to the end cover 212.

[0230] The end cap 212 refers to a component that covers the opening of the shell 211 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 212 can be adapted to the shape of the shell 211 to match the shell 211. Optionally, the end cap 212 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 212 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength. Functional components such as battery cell terminals can be provided on the end cap 212. The battery cell terminals can be used to electrically connect to the battery cell assembly 22 for outputting or inputting electrical energy of the battery cell 20.

[0231] The housing 211 is a component used to cooperate with the end cover 212 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the battery cell assembly 22, electrolyte and other components. The housing 211 and the end cover 212 can be independent components, and a receiving opening 2112 can be provided on the housing 211, and the end cover 212 is closed at the receiving opening 2112 to form the internal environment of the battery cell 20.

[0232] Without limitation, the end cover 212 and the shell 211 may be integrated. Specifically, the end cover 212 and the shell 211 may form a common connection surface before other components are inserted into the shell. When the interior of the shell 21 needs to be encapsulated, the end cover 212 covers the shell 211.

[0233] The housing 211 may be in various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 211 may be determined according to the specific shape and size of the battery cell assembly 22. The housing 211 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present embodiment of the application does not impose any special restrictions on this.

[0234] Combination Figure 3 As shown, the battery cell assembly 22 enters the inner cavity 2111 from the receiving opening 2112, and the battery cell assembly 22 is received in the inner cavity 2111 of the housing 211, and the end cover 212 is covered on the receiving opening 2112, so as to seal the inner cavity 2111 to ensure the sealing of the inner cavity 2111. The first wall 213 and the receiving opening 2112 are respectively provided at opposite ends of the housing 211.

[0235] The receiving opening 2112 may be provided at the bottom, top or side of the housing 211, and correspondingly, the end cover 212 may be disposed at the bottom, top or side of the housing 211. Figure 4 As shown, the first wall 213 is the bottom wall of the shell 211 , the pressure relief mechanism 25 is arranged on the bottom wall, the accommodating opening 2112 is opened at the top of the shell 211 , and the end cover 212 is connected to the top of the shell 211 to cover the accommodating opening 2112 .

[0236] In this example, the end cap 212 can be detachably connected to the shell 211, and the end cap 212 is used to seal the inner cavity 2111 of the shell 211 so that the inner cavity 2111 forms a closed space. The battery cell assembly 22 is accommodated in the closed space. The gas generated by the battery cell assembly 22 can flow to the position of the pressure relief mechanism 25 through the exhaust channel 233, thereby realizing the directional movement of the fluid. The end cap 212 and the shell 211 can both protect the battery cell assembly 22.

[0237] In a specific embodiment, the battery cell 20 includes a shell 21, a battery cell assembly 22 and a separator 23; the shell 21 has an inner cavity 2111, and the shell 21 includes a first wall 213; the battery cell assembly 22 is arranged in the inner cavity 2111; the separator 23 is arranged between the first wall 213 and the battery cell assembly 22, and the separator 23 abuts against the first wall 213 and the battery cell assembly 22 respectively; the separator 23 at least includes a separator made of a metal material; the metal material at least includes a combination of one or more of aluminum, magnesium, zinc, titanium, nickel, copper and alloys; an oxide layer is formed on the surface of the separator; The battery cell 20 further includes a pressure relief mechanism 25 disposed on the first wall 213, an exhaust channel 233 is formed on the separator 23, and the exhaust channel 233 is connected to the pressure relief mechanism 25; the exhaust channel 233 is connected to the edge of the separator 23 in the first direction X, and the first direction X intersects with the thickness direction of the first wall 213; the housing 21 further includes a second wall 214, the second wall 214 is connected to the first wall 213, and a gap 26 is formed between the second wall 214 and the outer peripheral surface of the battery cell assembly 22, and the gap 26 is connected to the exhaust channel 233; the separator 23 includes a support plate 231 and a plurality of protrusions The support plate 231 has a first surface 2311, and a plurality of protrusions 232 are connected to the first surface 2311 and are arranged to form an exhaust passage 233; the protrusions 232 are integrally formed on the support plate 231; the first surface 2311 is arranged toward the first wall 213; the support plate 231 has a first edge 234 and a second edge 235 opposite to each other along the first direction X, and the plurality of protrusions 232 include at least a first protrusion 2321 and a second protrusion 2322, and the first protrusion 2321 and the second protrusion 2322 both extend from the first edge 234 to the first wall 213 along the first direction X. The second edge 235, the first protrusion 2321 and the second protrusion 2322 are spaced in the third direction Y to form an exhaust channel 233, and the third direction Y is perpendicular to the first direction X, and the first direction X is a direction perpendicular to the thickness of the support plate 231; the multiple protrusions 232 also include a plurality of third protrusions 2323 located between the first protrusion 2321 and the second protrusion 2322, and the multiple third protrusions 2323 are respectively arranged at the positions of the first edge 234 and the second edge 235 together with the first protrusion 2321 and the second protrusion 2322 to form a plurality of channel entrances.

[0238] Based on the above battery cell 20, the present application further proposes an example of a battery 100. The battery 100 includes the battery cell 20 as described in any of the above examples.

[0239] The battery 100 in this example may include a box body 10, and a battery cell 20 is installed in the box body 10. The battery 100 may include one battery cell 20, or may include multiple battery cells 20. When multiple battery cells 20 are provided in the battery 100, the multiple battery cells 20 may be arranged according to a preset rule. The multiple battery cells 20 may be arranged in a row of multiple columns or multiple rows of multiple columns. The multiple battery cells 20 may be connected in series, in parallel, or in series-parallel hybrid.

[0240] It is understandable that in this example, only the battery 100 including the above-mentioned battery cell 20 is described, and the battery 100 may also include other functional components, which will not be described in detail.

[0241] The example of the battery 100 in the present application is based on the example of the battery cell 20 described above. The example of the battery 100 includes all the technical effects of the example of the battery cell 20 described above, which will not be described in detail.

[0242] In some examples, an example of an electrical device is disclosed, the electrical device including the battery cell 20 described in any of the above examples, or the battery 100 described in any of the above examples.

[0243] The electrical devices in this example include, but are not limited to: mobile phones, portable devices, laptop computers, electric vehicles, electric vehicles 1000, ships, spacecraft, electric toys and electric tools, etc. The battery cells 20 described in any of the above examples can be installed separately in the electrical devices, and the above-mentioned battery 100 can also be installed in the electrical devices.

[0244] The examples of the electrical device in the present application are based on the examples of the battery cell 20 or the battery 100 described above, and the examples of the electrical device include all the technical effects of the examples of the battery cell 20 or the battery 100 described above, which will not be repeated.

[0245] Combination Figure 21-30 As shown, Fig.21 The exploded structure of the battery cell 20 of some other embodiments of the present application is shown in FIG. Figure 1 ; Fig. 22 The exploded structure of the battery cell 20 of some other embodiments of the present application is shown in FIG. Figure 2 ; Fig.23 The exploded structure of the battery cell 20 of some other embodiments of the present application is shown in FIG. Figure 3 ; Fig.24 A front view of a separator 23 in a battery cell 20 in some other embodiments of the present application is shown;

[0246] Fig.25 A schematic diagram showing the flow direction of airflow on the isolation member 23 in the battery cell 20 in some other embodiments of the present application is shown; Fig.26 Shows Fig.24 Rear view in; Fig. 27 Shows Fig.26 CC section view in;

[0247] Fig.28 Shows Fig. 27 A partial magnified view of the D part; Fig.29 Shows Fig.26 axonometric drawing; Fig.30 Schematic diagram showing the flow direction of airflow in a battery cell 20 provided in some other embodiments of the present application; in this example, combined with Fig. 22 As shown, the first protrusion 2321 has a first side 23211 facing the exhaust passage 233 , a portion of the first side 23211 protrudes outward toward the second protrusion 2322 to form a first blocking wall 23212 , and a surface of the first blocking wall 23212 faces the first edge 234 .

[0248] Since the first protrusion 2321 and the second protrusion 2322 both extend from the first edge 234 to the second edge 235 along the first direction X, and an exhaust channel 233 is formed between the first protrusion 2321 and the second protrusion 2322, the first protrusion 2321 has a first side 23211 facing the exhaust channel 233. It can be understood that the first side 23211 extends from the first edge 234 to the second edge 235.

[0249] The first retaining wall 23212 is formed on the first side 23211 , and the first retaining wall 23212 can be located at any position between the first edge 234 and the second edge 235 of the first side 23211 . For example, the first retaining wall 23212 can be located at the middle position of the first side 23211 between the first edge 234 and the second edge 235 .

[0250] Combined Fig.25As shown, the surface of the first baffle 23212 faces the exhaust channel 233, and the surface of the first baffle 23212 is arranged toward the first edge 234. Since the first channel inlet 236 is formed on the first edge 234, it can be known that the gas discharged from the battery cell assembly 22 enters the exhaust channel 233 through the first channel inlet 236 and flows toward the first baffle 23212. When the gas flows to the first baffle 23212, the first baffle 23212 can block part of the gas, so that the gas can converge at the position of the first baffle 23212 to form a fluid convergence area 2331. The pressure relief mechanism 25 is installed on the first wall 213 of the housing 21 and is arranged close to the first baffle 23212, so that the fluid convergence area 2331 is arranged opposite to the pressure relief mechanism 25.

[0251] The surface of the first retaining wall 23212 is inclined toward the first edge 234 and forms a first preset angle with the first direction X. The first preset angle ranges from 0° to 90°. For example, the first preset angle is 30°, 45°, 60° or 90°.

[0252] In this example, a first baffle wall 23212 is formed on a first side edge 23211 of the first protrusion 2321. The first baffle wall 23212 is used to block the gas entering the exhaust channel 233 so that the gas can converge on the front side of the first baffle wall 23212, and a fluid convergence area 2331 is formed at the position of the first baffle wall 23212. After the gas converges, it can be discharged through the pressure relief mechanism 25, thereby improving the directional pressure relief capability of the battery cell 20 and helping to improve the performance of the pressure relief mechanism 25.

[0253] In some examples, combined Fig.23 and Fig.24 As shown, the second protrusion 2322 has a second side 23221 facing the exhaust channel 233 , and a portion of the second side 23221 protrudes outward toward the first protrusion to form a second blocking wall 23222 , and a surface of the second blocking wall 23222 faces the second edge 235 .

[0254] Since the first protrusion 2321 and the second protrusion 2322 both extend from the first edge 234 to the second edge 235 along the first direction X, and an exhaust channel 233 is formed between the first protrusion 2321 and the second protrusion 2322, the second protrusion 2322 has a second side 23221 facing the exhaust channel 233. It can be understood that the second side 23221 extends from the first edge 234 to the second edge 235.

[0255] The second retaining wall 23222 is formed on the second side 23221 , and the second retaining wall 23222 can be located at any position of the second side 23221 between the first edge 234 and the second edge 235 . For example, the second retaining wall 23222 can be located at the middle position of the second side 23221 between the first edge 234 and the second edge 235 .

[0256] Combined Fig.25 As shown, the surface of the second baffle 23222 faces the exhaust channel 233, and the surface of the second baffle 23222 faces the second edge 235. Since the second edge 235 is formed with a second channel inlet 237, it can be known that the gas discharged from the battery cell assembly 22 enters the exhaust channel 233 through the second channel inlet 237 and flows toward the second baffle 23222. When the gas flows to the second baffle 23222, the second baffle 23222 can block part of the gas, so that the gas can converge at the position of the second baffle 23222 to form a fluid convergence area 2331. The pressure relief mechanism 25 is installed on the first wall 213 of the housing 21 and is arranged close to the second baffle 23222, so that the fluid convergence area 2331 is arranged opposite to the pressure relief mechanism 25.

[0257] The surface of the second retaining wall 23222 is inclined toward the second edge 235 and forms a second preset angle with the first direction X. The second preset angle ranges from 0° to 90°. For example, the first preset angle is 30°, 45°, 60° or 90°.

[0258] In this example, a second baffle wall 23222 is formed on the second side edge 23221 of the second protrusion, and the second baffle wall 23222 is used to block the gas entering the exhaust channel 233 so that the gas can converge at the position of the second baffle wall 23222, forming a fluid convergence area 2331 at the position of the second baffle wall 23222. After the gas converges, it can be discharged through the pressure relief mechanism 25, thereby improving the directional pressure relief capability of the battery cell 20 and helping to improve the performance of the pressure relief mechanism 25.

[0259] In some examples, combined Fig.21 , Fig.24 and Fig.25 As shown, the surface of the first baffle wall 23212 faces the surface of the second baffle wall 23222 , and the first baffle wall 23212 and the second baffle wall 23222 are spaced apart from each other; the pressure relief mechanism 25 is disposed relative to the spaced area between the first baffle wall 23212 and the second baffle wall 23222 .

[0260] The first baffle wall 23212 is located on the first side 23211 and is disposed close to the second edge 235, and the surface of the first baffle wall 23212 faces the first edge 234. The second baffle wall 23222 is located on the second side 23221 and is disposed close to the first edge 234, and the surface of the second baffle wall 23222 faces the second edge 235. Therefore, it can be understood that a spacing area or spacing space can be formed between the first baffle wall 23212 and the second baffle wall 23222, and the spacing area or spacing space is the formed fluid convergence area 2331.

[0261] The surface of the first baffle wall 23212 faces the first edge 234, and the surface of the second baffle wall 23222 faces the second edge 235. The first edge 234 and the second edge 235 are respectively located at the two ends of the exhaust channel 233 in the first direction X. Therefore, it can be known that the first baffle wall 23212 and the second baffle wall 23222 are arranged relatively to each other, or it can be understood that the surface of the first baffle wall 23212 faces the surface of the second baffle wall 23222; the situation where the surface of the first baffle wall 23212 faces the surface of the second baffle wall 23222 includes that the surface of the first baffle wall 23212 and the surface of the second baffle wall 23222 are spaced apart and arranged in parallel, or the surface of the first baffle wall 23212 and the surface of the second baffle wall 23222 may have an inclined angle of 0°-45°, for example, the inclined angle is 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, etc.

[0262] The surface of the first baffle wall 23212 is configured to face the surface of the second baffle wall 23222. The first baffle wall 23212 can block at least part of the gas entering the exhaust channel 233 from the first channel inlet 236 on the first edge 234, and the second baffle wall 23222 can block at least part of the gas entering the exhaust channel 233 from the second channel inlet 237 on the second edge 235. Therefore, the gas accumulates between the first baffle wall 23212 and the second baffle wall 23222 to form a fluid convergence area 2331. When the fluid convergence area 2331 is configured relative to the pressure relief mechanism 25, the pressure relief mechanism 25 can open the pressure relief in time, which is beneficial to improving the performance of the pressure relief mechanism 25.

[0263] In some examples, combined Fig.24 and Fig.25 As shown, a second guide segment 23223 is formed on the second side 23221 along the first direction X from the first edge 234 toward the first side 23211 slantingly. The second guide segment 23223 is connected to the second retaining wall 23222 and has a flow guiding direction toward the surface of the first retaining wall 23212 .

[0264] The second guide section 23223 may be a partial surface area of ​​the second side 23221. Therefore, it can be known that the second guide section 23223 is located between the first edge 234 and the second baffle wall 23222. The second guide section 23223 is inclined toward the first side 23211 along the direction from the first edge 234 toward the second edge 235. Therefore, in the direction from the first channel inlet 236 toward the exhaust channel 233, the exhaust channel 233 is gradually narrowed. The extending end of the second guide section 23223 is toward the first baffle wall 23212. The guide direction of the second guide section 23223 refers to the flow direction of the gas along the second guide section 23223. That is, the gas flowing along the second guide section 23223 flows toward the surface of the first baffle wall 23212 under the guiding action of the second guide section 23223.

[0265] The angle range of the second guide section 23223 inclined toward the first side edge 23211 is but not limited to 0°-30°, for example, 5°, 10°, 15°, 20°, 25°, 30°, etc., and can be adaptively designed according to the position of the first baffle wall 23212 and the length and width of the exhaust channel 233, etc.

[0266] In this example, by configuring the second guide section 23223, the gas entering the exhaust channel 233 from the first channel inlet 236 can flow toward the first baffle wall 23212 under the guidance of the second guide section 23223, thereby improving the directionality of the gas flowing toward the first baffle wall 23212. Through the blocking effect of the first baffle wall 23212, the gas can converge at the position of the first baffle wall 23212, thereby improving the blocking effect of the first baffle wall 23212 on the gas.

[0267] In some examples, combined Fig.24 and Fig.25 As shown, a first guide section 23213 is formed on the first side 23211 and is inclined from the second edge 235 toward the second side 23221 along the first direction X. The first guide section 23213 is connected to the first retaining wall 23212 and has a flow guiding direction toward the surface of the second retaining wall 23222 .

[0268] The first guide section 23213 may be a partial surface area of ​​the first side 23211. Therefore, it can be known that the first guide section 23213 is located between the second edge 235 and the first baffle wall 23212. The first guide section 23213 is inclined toward the second side 23221 along the direction from the second edge 235 toward the first edge 234. Therefore, in the direction from the second channel inlet 237 toward the exhaust channel 233, the exhaust channel 233 is configured to be gradually contracted. The extending end of the first guide section 23213 is toward the second baffle wall 23222. The guide direction of the first guide section 23213 refers to the flow direction of the gas along the first guide section 23213. That is, the gas flowing along the first guide section 23213 flows toward the surface of the second baffle wall 23222 under the guiding action of the first guide section 23213.

[0269] The angle range of the first guide section 23213 inclining toward the second side edge 23221 is but not limited to 0°-30°, for example, 5°, 10°, 15°, 20°, 25°, 30°, etc., and can be adaptively designed according to the position of the second baffle wall 23222 and the length and width of the exhaust channel 233, etc.

[0270] In this example, by configuring the first guide section 23213, the gas entering the exhaust channel 233 from the second channel inlet 237 can flow toward the second baffle wall 23222 under the guidance of the first guide section 23213, thereby improving the directionality of the gas flowing toward the second baffle wall 23222. Through the blocking effect of the second baffle wall 23222, the gas can converge at the position of the second baffle wall 23222, thereby improving the blocking effect of the second baffle wall 23222 on the gas.

[0271] In a specific implementation, referring to Figure 21-30As shown, the first protrusion 2321 has a first side 23211 facing the exhaust passage 233, a portion of the first side plate protrudes outward toward the second protrusion to form a first baffle wall 23212, and the surface of the first baffle wall 23212 faces the first edge 234; the second protrusion 2322 has a second side 23221 facing the exhaust passage 233, a portion of the second side 23221 protrudes outward toward the first protrusion to form a second baffle wall 23222, and the surface of the second baffle wall 23222 faces the second edge 235; the surface of the first baffle wall 23212 faces the surface of the second baffle wall 23222, and the first baffle wall 23212 and the second baffle wall 23222 are spaced apart; the pressure relief machine The structure 25 is arranged relative to the interval area between the first baffle wall 23212 and the second baffle wall 23222; a second guide section 23223 is formed on the second side 23221 along the first direction X, which is inclined from the first edge 234 toward the first side 23211, and the second guide section 23223 is connected to the second baffle wall 23222 and the diversion direction is toward the surface of the first baffle wall 23212; a first guide section 23213 is formed on the first side 23211 along the first direction X, which is inclined from the second edge 235 toward the second side 23221, and the first guide section 23213 is connected to the first baffle wall 23212 and the diversion direction is toward the surface of the second baffle wall 23222.

[0272] The above are only preferred embodiments of the present application, and only specifically describe the technical principles of the present application. These descriptions are only for explaining the principles of the present application and cannot be interpreted as limiting the scope of protection of the present application in any way. Based on the explanation here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application, and other specific implementation methods of the present application that can be associated with the technicians in this field without creative work, should be included in the scope of protection of the present application.

Claims

1. A battery cell, characterized in that: include: a housing having an interior cavity, the housing comprising a first wall; A battery cell assembly is disposed in the inner cavity; as well as The isolating member is disposed between the first wall and the battery cell assembly, and the isolating member abuts against the first wall and the battery cell assembly respectively; the isolating member includes a metal layer.

2. The battery cell according to claim 1, characterized in that: The metal layer includes one of aluminum, magnesium, zinc, titanium, nickel, copper and alloys thereof.

3. The battery cell according to claim 2, characterized in that: The isolation member has two side surfaces, and the two side surfaces are respectively arranged toward the first wall and the battery core assembly, and an oxide layer is formed on the surface of at least one of the two side surfaces.

4. The battery cell according to any one of claims 1 to 3, characterized in that: The battery cell further includes an insulating film wrapped around the outside of the battery cell assembly, the separator abuts against the insulating film, and the separator is arranged on a side of the insulating film away from the battery cell assembly.

5. The battery cell according to claim 4, characterized in that: The insulating film is folded and wrapped around the battery cell assembly to form a first folded edge and a second folded edge that overlap each other on the side of the battery cell assembly, and a positioning hole is provided at the portion of the insulating film between the battery cell assembly and the isolation member; the battery cell also includes a tape, and the tape includes a first part and a second part that are connected to each other, the first part is arranged between the isolation member and the insulating film and covers the positioning hole, and the second part fixes the first folded edge and the second folded edge.

6. The battery cell according to claim 1, characterized in that: The battery cell further includes a pressure relief mechanism disposed on the first wall. An exhaust channel is formed on the isolation member, and the exhaust channel is communicated with the pressure relief mechanism.

7. The battery cell according to claim 6, characterized in that: The exhaust passage communicates with an edge of the partition in a first direction intersecting with a thickness direction of the first wall.

8. The battery cell according to claim 7, characterized in that: The housing further includes a second wall, the second wall is connected to the first wall, a gap is formed between the second wall and the outer peripheral surface of the battery cell assembly, and the gap is communicated with the exhaust channel.

9. The battery cell according to any one of claims 6 to 8, characterized in that: The isolation member includes a support plate and a plurality of protrusions. The support plate has a first surface. The plurality of protrusions are connected to the first surface and surround the exhaust passage.

10. The battery cell according to claim 9, characterized in that: The protrusion is integrally formed on the support plate.

11. The battery cell according to claim 9, characterized in that: The first surface is disposed toward the first wall.

12. The battery cell according to claim 9, characterized in that: The support plate has a first edge and a second edge arranged along a first direction, and the multiple protrusions include at least a first protrusion and a second protrusion, the first protrusion and the second protrusion both extend along the first direction and are located between the first edge and the second edge, the first protrusion and the second protrusion are spaced in a third direction to form the exhaust channel, and the thickness direction of the support plate, the first direction, and the third direction intersect each other.

13. The battery cell according to claim 12, characterized in that: The multiple protrusions also include multiple third protrusions located between the first protrusions and the second protrusions, some of the third protrusions are located at the first edge and together with the first protrusions and the second protrusions to form multiple channel entrances, and the remaining third protrusions are located at the second edge and together with the first protrusions and the second protrusions to form multiple channel entrances.

14. The battery cell according to claim 13, characterized in that: Along the first direction, the plurality of third protrusions are arranged at intervals, and the pressure relief mechanism is disposed relative to the interval areas between the plurality of third protrusions.

15. The battery cell according to claim 12, characterized in that: The first protrusion has a first side facing the exhaust channel, a portion of the first side protrudes outward toward the second protrusion to form a first blocking wall, and a surface of the first blocking wall faces the first edge.

16. The battery cell according to claim 15, characterized in that: The second protrusion has a second side facing the exhaust channel, a portion of the second side protrudes outward toward the first protrusion to form a second blocking wall, and a surface of the second blocking wall faces the second edge.

17. The battery cell according to claim 16, characterized in that: The surface of the first baffle wall faces the surface of the second baffle wall, and the first baffle wall is spaced apart from the second baffle wall. The pressure relief mechanism is arranged relative to the spaced area between the first baffle wall and the second baffle wall.

18. The battery cell according to claim 16, characterized in that: The second side edge is inclined along the first direction from the first edge toward the first side edge to form a second guide section, and the second guide section is connected to the second baffle wall and the flow guide direction is toward the first baffle wall.

19. The battery cell according to claim 18, characterized in that: A first guide section is provided on the first side edge and is inclined from the second edge toward the second side edge along the first direction. The first guide section is connected to the first baffle wall and has a flow guiding direction toward the second baffle wall.

20. The battery cell according to claim 9, characterized in that The outer convex height of the convex portion is 0.4mm-0.8mm; and / or The thickness of the support plate is 0.4mm-0.8mm.

21. The battery cell according to claim 9, characterized in that: The support plate has a second surface disposed opposite to the first surface, and a concave portion is formed on the second surface; the concave portion and the convex portion are disposed in one-to-one alignment in the thickness direction of the support plate.

22. The battery cell according to claim 12, characterized in that: The first protrusion and the second protrusion are respectively formed by bending two edges of the support plate perpendicular to the first direction.

23. The battery cell according to any one of claims 1 to 3, characterized in that: The housing comprises a shell and an end cover. The shell is provided with a receiving opening. The end cover is connected to the shell and covers the receiving opening. The first wall is a wall of the shell or the end cover.

24. A battery, characterized in that: Comprising a battery cell as claimed in any one of claims 1 to 23.

25. An electrical device, characterized in that: Comprising a battery cell as claimed in any one of claims 1 to 23, or, comprising a battery as claimed in claim 24.

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