End cover assembly, battery monomer, battery and electric device

Abstract

The embodiment of the utility model provides an end cover assembly, a battery monomer, a battery and an electric device, the battery monomer comprises a shell and the end cover assembly, the shell is provided with an accommodating cavity, and one side of the accommodating cavity along a first direction is open; the end cover assembly comprises a cover plate suite and a top support, the cover plate suite covers the open position of the containing cavity, the top support is arranged in the containing cavity, and the cover plate suite is provided with an anti-explosion valve triggering area and a flow guide channel; at least part of the top support and the cover plate suite are spaced in the first direction to form a confluence space, the explosion-proof valve triggering area is communicated with the confluence space, the top support is provided with a through exhaust hole, and the exhaust hole is communicated with the confluence space and the containing cavity; air outlets of the flow guide channels communicate with the confluence space, and air inlets of the flow guide channels are located in the containing cavity and spaced from the inner wall of the containing cavity. According to the end cover assembly in the embodiment of the utility model, the opening condition of the anti-explosion valve can be met more quickly, the response speed of the anti-explosion valve is favorably improved, and the explosion risk of the single battery is favorably reduced.

Description

Technical Field

[0001] The embodiments of the utility model relate to the technical field of batteries, and in particular to an end cover assembly, a battery cell, a battery and an electrical device. Background Art

[0002] In recent years, the new energy industry has developed vigorously, and batteries are an indispensable part of the new energy industry.

[0003] The battery includes several battery cells, which include end cap assemblies, electrode assemblies and shells. The electrode assemblies and electrolytes are placed in the shells and sealed by the end cap assemblies and the shells to allow the electrode assemblies and electrolytes to undergo electrochemical reactions to achieve charging and discharging of the battery cells.

[0004] The end cover assembly is equipped with an explosion-proof valve. When a battery cell generates a large amount of high-temperature and high-pressure gas due to thermal runaway, the high-temperature and high-pressure gas reaches the explosion-proof valve triggering area through the exhaust channel in the end cover assembly and triggers the explosion-proof valve to open, so as to discharge the high-temperature and high-pressure gas from the battery cell and reduce the risk of explosion of the battery cell.

[0005] In the related art, the explosion-proof valve is arranged at the center of the end cover assembly. When the battery cell is in thermal runaway, the electrode assembly, the top bracket in the end cover assembly and other components may be deformed due to the impact of high-temperature and high-pressure gas and other reasons, thereby causing the risk of blockage in the exhaust passage, resulting in poor exhaust and safety risks. Utility Model Content

[0006] In view of this, the embodiments of the utility model hope to provide an end cover assembly, a battery cell, a battery and an electrical device that can enable high temperature and high pressure gas to reach the explosion-proof valve triggering area more smoothly when thermal runaway occurs in the battery cell.

[0007] To achieve the above purpose, the technical solution of the embodiment of the utility model is implemented as follows:

[0008] The present invention provides a battery cell, which includes:

[0009] A housing is provided with a receiving cavity, wherein one side of the receiving cavity is open along a first direction;

[0010] An end cover assembly, the end cover assembly comprises a cover plate set and a top bracket, the cover plate set is covered at the open position of the accommodating cavity, the top bracket is arranged in the accommodating cavity, at least part of the top bracket and the cover plate set are spaced along the first direction to form a confluence space, the cover plate set is provided with an explosion-proof valve triggering area and a guide channel; the explosion-proof valve triggering area is communicated with the confluence space, the top bracket is provided with a through exhaust hole, and the exhaust hole communicates the confluence space with the accommodating cavity;

[0011] The air outlet of the guide channel is communicated with the confluence space, and the air inlet of the guide channel is located in the accommodating cavity and is spaced apart from the inner wall of the accommodating cavity.

[0012] After the battery cell in the embodiment of the utility model undergoes thermal runaway, at least part of the high-temperature and high-pressure gas can pass through the cover plate kit into the confluence space and then act on the explosion-proof valve triggering area, thereby reducing the probability that the airflow cannot pass through the exhaust hole to trigger the explosion-proof valve to open due to deformation of the top bracket; it is beneficial to reduce the size of the original exhaust hole on the top bracket, thereby helping to improve the structural strength of the top bracket; it is beneficial to increase the airflow rate entering the confluence space per unit time, so that the opening conditions of the explosion-proof valve can be met more quickly, which is beneficial to improving the response speed of the explosion-proof valve and reducing the explosion risk of the battery cell.

[0013] In some embodiments, the air inlet is open toward the second direction, and the first direction is perpendicular to the second direction. In this way, the probability that a part of the electrode assembly is not constrained by the end cap assembly along the first direction and moves relatively is reduced, the probability that the electrode assembly cannot be electrochemically normal due to the relative movement is reduced, and at the same time, the probability that solid particles on the electrode assembly enter the guide channel through the air inlet and cause the guide channel to be blocked is reduced.

[0014] In some embodiments, at least part of the air inlet is located at at least one end of the cover plate kit along the second direction, and the first direction is perpendicular to the second direction. In this way, the air inlet is closer to the edge area of ​​the accommodating cavity, and the guide channel guides the gas in the edge area of ​​the accommodating cavity into the confluence space, which helps to make the gas pressure in the confluence space meet the conditions for triggering the explosion-proof valve to open more quickly, and helps to improve the response speed of the explosion-proof valve.

[0015] In some embodiments, the second direction is the length direction of the cover plate set. In this way, the air inlet is closer to the inner wall of the accommodating chamber away from the explosion-proof valve, so that the gas in the area of ​​the accommodating chamber away from the explosion-proof valve can be better guided to the confluence space, which is conducive to faster discharge of the gas.

[0016] In some embodiments, the first end surface of the cover plate set at one end along the second direction is provided with a plurality of the air inlets, and the air inlets are spaced apart along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other. In this way, on the one hand, the air inlet is not directly facing the electrode assembly, which reduces the probability of impurities entering the guide channel through the air inlet in the state of thermal runaway; on the other hand, it is conducive to reducing the size of the cover plate set along the first direction, which is conducive to making the structure of the cover plate set more compact.

[0017] In some embodiments, along the flow direction of the air flow, the cross-sectional area of ​​the air inlet is larger than the cross-sectional area of ​​the air outlet. This is conducive to making the flow rate of the gas passing through the air inlet smaller than the flow rate of the gas passing through the air outlet, thereby facilitating the formation of a pressure difference, facilitating a faster increase in the pressure of the gas in the confluence space, thereby being able to more quickly meet the opening conditions of the explosion-proof valve, facilitating the improvement of the response speed of the explosion-proof valve, and facilitating the reduction of the explosion risk of the battery cell.

[0018] In some embodiments, the cover plate kit includes a cover plate body and a lower plastic part, the lower plastic part is arranged on one side of the cover plate body along the first direction, the lower plastic part and the top bracket form the confluence space, and the cover plate body and the lower plastic part are jointly arranged to form the flow guide channel. In this way, it is helpful to reduce the manufacturing difficulty of the flow guide channel, improve the space utilization rate in the cover plate kit, make the structure of the cover plate kit more compact, and facilitate cleaning of the flow guide channel during the disassembly and assembly of the battery cell.

[0019] In some embodiments, the lower plastic part includes a main body and at least two limiting parts, the explosion-proof valve triggering area is arranged in the main body, the two limiting parts are respectively arranged at opposite ends of the main body along the second direction, the first direction and the second direction are perpendicular, an airflow space is arranged in the limiting part, the airflow space is open on one side along the first direction, the cover body is covered at the opening of the airflow space to jointly enclose and form the guide channel, the limiting part protrudes from the main body at one end away from the cover body along the first direction, the top bracket is located between the two limiting parts, and the limiting part, the main body and the top bracket are enclosed to form the confluence space. In this way, the airflow space is arranged inside the limiting part, the space inside the limiting part can be effectively utilized, which is conducive to improving the utilization rate of the space inside the battery cell; in the process of assembling the cover kit, the guide channel is formed while the cover body is connected to the lower plastic part along the first direction, which is conducive to simplifying the manufacturing and assembly steps.

[0020] In some embodiments, the limiting portion includes a first wall portion, a surface of one side of the first wall portion along the second direction forms at least a portion of the inner wall of the airflow space along the second direction close to the main body portion, the first wall portion is in contact with the cover body along the first direction, the air outlet is provided on the first wall portion, and the air outlet is spaced apart from the cover body along the first direction. In this way, the joint between the cover body and the main body portion will not be directly connected to the air outlet, so that the airflow will not directly enter between the cover body and the main body portion through the air outlet during the process of flowing through the air outlet; at the same time, due to the blocking and guiding effect of the first wall portion, the airflow in the guide channel is guided to flow to the air outlet rather than the contact position between the first wall portion and the cover body.

[0021] In some embodiments, the guide channel extends along the second direction and has only one air inlet and one air outlet, and the first direction is perpendicular to the second direction, thereby simplifying the structure of the guide channel and reducing manufacturing costs.

[0022] In some embodiments, the guide channel includes an air inlet channel and an air outlet channel, the number of the air inlet channels is multiple, the outlet of the air outlet channel along the air flow direction forms the air outlet, the inlet of the air inlet channel along the air flow direction forms the air inlet, and the outlet of each air inlet channel along the air flow direction is connected to the inlet of the air outlet channel along the air flow direction. In this way, even if part of the air inlet channel is in a blocked state, the guide channel can still maintain unobstructed, so that the airflow can enter the confluence space normally; it is beneficial to make the sum of the cross-sectional areas of each air inlet channel perpendicular to the air flow direction greater than the cross-sectional area of ​​the air outlet channel perpendicular to the air flow direction, so as to form a pressure difference and to increase the pressure of the gas in the confluence space more quickly; at the same time, it is beneficial to arrange the inlets of each air inlet channel at different positions of the cover plate kit, and arrange the air outlet at a position closer to the trigger area of ​​the explosion-proof valve, so as to gather the airflows at different positions to directly act on the trigger area of ​​the explosion-proof valve, which is beneficial to improve the response speed of the explosion-proof valve opening.

[0023] In some embodiments, the cover plate set is provided with an airflow space, the airflow space is connected with the confluence space and forms the air outlet, a part of the airflow space is opened to form an opening, a flow divider is provided in the airflow space, the flow divider connects the side walls on opposite sides of the airflow space to separate a part of the airflow space to form a plurality of the air inlet channels, and separates the opening to form a plurality of the air inlets. In this way, the purpose of forming a plurality of air inlet channels is achieved by the flow divider, and at the same time, the air inlets of each air inlet channel are arranged at intervals from each other.

[0024] In some embodiments, the battery cell further includes an insulating film and an electrode assembly, the insulating film and the electrode assembly are both disposed in the accommodating cavity, a portion of the insulating film is located between the electrode assembly and the inner wall of the accommodating cavity to separate the electrode assembly from the shell, the opening is located on the first end face of one end of the cover plate set along the second direction, the first direction is perpendicular to the second direction, the surface of the diverter close to the open end along the second direction is the second end face, the second end face is flush with the first end face, and a portion of the insulating film is fixed to the first end face and the second end face. In this way, it is beneficial to reduce the size of a single air inlet, to improve the structural strength of the cover plate set, and to increase the contact area between the insulating film and the cover plate set, so that the connection between the two is more secure.

[0025] In some embodiments, the flow divider includes a baffle and a guide plate, the surface of the baffle on the first side along the second direction forms the second end surface, the edge of the baffle and the edge of the part of the opening surround the air inlet, and the guide plate is arranged on the second side of the baffle along the second direction and extends along the second direction. In this way, the baffle can be used to connect with the insulating film and achieve the purpose of separating the opening to form the air inlet; the guide plate achieves the purpose of separating the air inlet channel formed by a part of the air flow space, and at the same time, the guide plate can guide the air flow in the air inlet channel to move along the second direction; the guide plate and the baffle have simple structures and are easy to manufacture.

[0026] In some embodiments, the cross-sectional area of ​​the flow divider perpendicular to the second direction gradually decreases in the direction close to the air outlet along the second direction. This is conducive to achieving the purpose of the air inlet channels separated by the flow divider approaching each other along the flow direction of the airflow until they merge with the air outlet channel, which is conducive to reducing the amplitude of the airflow turning in the air inlet channel and making the airflow flow more smoothly in the guide channel.

[0027] In some embodiments, in the projection perpendicular to the first direction, the cross-sectional shape of the flow divider is a trapezoid or a semicircle. This is conducive to achieving the purpose of the air inlet channels separated by the flow divider approaching each other along the flow direction of the airflow until they merge with the air outlet channel; it is conducive to making the airflow turn more gently in the air inlet channel, thereby facilitating the reduction of gas pressure loss, and further facilitating the improvement of the response speed of the triggering area of ​​the explosion-proof valve.

[0028] The present utility model also provides an end cover assembly for covering an opening of a receiving cavity of a battery cell, the end cover assembly comprising:

[0029] Cover kit with explosion-proof valve trigger area and diversion channel;

[0030] A top bracket is arranged at one side of the cover plate set along a first direction, at least a portion of the top bracket and the cover plate set are spaced along the first direction to form a confluence space, the explosion-proof valve triggering area is connected to the confluence space, and the top bracket is provided with a through exhaust hole, and the exhaust hole is used to connect the confluence space and the accommodating cavity;

[0031] The air outlet of the guide channel is communicated with the confluence space, and the air inlet of the guide channel is used for the airflow in the accommodating cavity to enter the guide channel.

[0032] In the end cover assembly in the embodiment of the utility model, after the battery cell undergoes thermal runaway, at least part of the high-temperature and high-pressure gas can pass through the cover plate kit into the confluence space and then act on the explosion-proof valve triggering area, thereby reducing the probability that the airflow cannot pass through the exhaust hole of the top bracket to trigger the opening of the explosion-proof valve due to deformation of the top bracket; it is beneficial to reduce the size of the original exhaust hole on the top bracket, thereby facilitating the improvement of the structural strength of the top bracket; it is beneficial to increase the airflow rate entering the confluence space per unit time, thereby being able to more quickly meet the opening conditions of the explosion-proof valve, thereby facilitating the improvement of the response speed of the explosion-proof valve.

[0033] In some embodiments, the cover plate kit includes a cover plate body and a lower plastic part, the lower plastic part is arranged on one side of the cover plate body along the first direction, the confluence space is formed between the lower plastic part and the top bracket, the lower plastic part includes a main body and at least two limiting parts, the explosion-proof valve triggering area is arranged on the main body, the two limiting parts are respectively arranged at opposite ends of the main body along the second direction, the first direction is perpendicular to the second direction, an airflow space is provided in the limiting part, and the airflow space is open on one side along the first direction, the cover plate body is covered at the opening of the airflow space to jointly enclose and form the guide channel, the limiting part protrudes from the main body at one end away from the cover plate body along the first direction, the top bracket is located between the two limiting parts, and the limiting part, the main body and the top bracket enclose and form the confluence space. In this way, the airflow space is set inside the limiting part, which can effectively utilize the space inside the limiting part, which is beneficial to improving the utilization rate of the space inside the battery cell; in the process of assembling the cover plate kit, the cover plate body is connected to the lower plastic part along the first direction while forming a guide channel, which is beneficial to simplify the manufacturing and assembly steps.

[0034] In some embodiments, the limiting portion includes a first wall portion, a surface of one side of the first wall portion along the second direction forms at least a portion of the inner wall of the airflow space along the second direction close to the main body portion, the first wall portion is in contact with the cover body along the first direction, the air outlet is provided on the first wall portion, and the air outlet is spaced apart from the cover body along the first direction. In this way, the joint between the cover body and the main body portion will not be directly connected to the air outlet, so that the airflow will not directly enter between the cover body and the main body portion through the air outlet during the process of flowing through the air outlet; at the same time, due to the blocking and guiding effect of the first wall portion, the airflow in the guide channel is guided to flow to the air outlet rather than the contact position between the first wall portion and the cover body.

[0035] In some embodiments, the cover plate kit is provided with an air flow space, the air flow space is connected with the confluence space and forms the air outlet, a part of the air flow space is opened to form an opening, a diverter is provided in the air flow space, the diverter connects the side walls on opposite sides of the air flow space to separate a part of the air flow space to form a plurality of air inlet channels, and separates the opening to form a plurality of air inlets, and another part of the air flow space forms an air outlet channel, the outlet of the air outlet channel along the air flow direction forms the air outlet, and the outlet of each air inlet channel along the air flow direction is connected with the inlet of the air outlet channel along the air flow direction. In this way, even if part of the air inlet channel is in a blocked state, the guide channel can still remain unobstructed so that the airflow can enter the confluence space normally; it is beneficial to make the sum of the cross-sectional areas of each air inlet channel perpendicular to the airflow direction larger than the cross-sectional area of ​​the air outlet channel perpendicular to the airflow direction, thereby facilitating the formation of a pressure difference, which is beneficial to more quickly increase the pressure of the gas in the confluence space; at the same time, it is beneficial to arrange the inlets of each air inlet channel at different positions of the cover plate kit, and arrange the air outlet at a position closer to the explosion-proof valve trigger area, so as to gather the airflows at different positions to directly act on the explosion-proof valve trigger area, which is beneficial to improve the response speed of the explosion-proof valve opening.

[0036] The embodiment of the utility model further provides a battery, which includes a box body and the battery cell in the above embodiment, wherein an installation space is provided in the box body, and the battery cell is arranged in the installation space.

[0037] In this way, by adopting the battery cell in the aforementioned embodiment, the probability of explosion in the event of thermal runaway of the battery cell is reduced, and the gas generated by the thermal runaway is discharged more promptly.

[0038] In some embodiments, the first direction is the direction of gravity, the battery cell further comprises an electrode assembly, the accommodating cavity is open at the bottom side along the first direction, the electrode assembly is located in the accommodating cavity, and the top bracket is located between the cover plate kit and the electrode assembly to support the electrode assembly. In this way, through the support of the electrode assembly by the top bracket, on the one hand, the probability of short circuit caused by contact between the electrode assembly and the cover plate kit is reduced; on the other hand, the top bracket can play a shielding role, reducing the probability of foreign matter remaining in the electrode assembly falling onto the cover plate kit under the action of gravity and causing short circuit.

[0039] The embodiment of the utility model further provides an electric device, which includes the battery in the above embodiment, and the battery is used as a power source for the electric device.

[0040] In this way, by adopting the battery in the aforementioned embodiment, the probability of explosion in the event of thermal runaway of the battery cell is reduced, which helps to improve the safety of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic diagram of an electric device in an embodiment of the present utility model is a vehicle;

[0042] Figure 2 is a schematic diagram of a battery in an embodiment of the present utility model;

[0043] Figure 3 It is a schematic diagram of an end cover assembly in one embodiment of the utility model at a first viewing angle;

[0044] Figure 4 for Figure 3 Schematic diagram of the explosion of the embodiment;

[0045] Figure 5 for Figure 3 A schematic diagram of the embodiment in the second viewing angle;

[0046] Figure 6 for Figure 5 A cross-sectional diagram of the AA position, wherein the dotted arrow indicates the flow direction of the airflow;

[0047] Figure 7 for Figure 6 A partial enlarged schematic diagram of position C in the middle, where the dotted arrow indicates the flow direction of the airflow;

[0048] Figure 8 for Figure 5 Schematic diagram of the section at the middle BB position;

[0049] Fig. 9 for Figure 8 A partial enlarged schematic diagram of the D position in the middle;

[0050] Fig.10 This is an exploded schematic diagram of a cover plate kit in one embodiment of the utility model;

[0051] Fig.11 It is a schematic diagram of a first embodiment of the lower plastic part in the utility model;

[0052] Fig.12 for Fig.11 A partial enlarged schematic diagram of position E in the middle, where the dotted arrow indicates the flow direction of the airflow;

[0053] Fig.13 for Fig.11 A schematic diagram of the embodiment in another viewing angle;

[0054] Fig.14 It is a schematic diagram of a second embodiment of the lower plastic part in the utility model;

[0055] Fig.15It is a schematic diagram of a third embodiment of the lower plastic part in the utility model;

[0056] Fig.16 for Fig.15 A partial enlarged schematic diagram of the F position in the middle;

[0057] Fig.17 It is a schematic diagram of a fourth embodiment of the lower plastic part in the utility model;

[0058] Fig.18 It is a schematic diagram of an explosion of a battery cell in one embodiment of the utility model.

[0059] Description of Reference Numerals

[0060] 1000, vehicle; 100, battery; 200, controller; 300, motor; 10, end cover assembly; 10a, confluence space; 10b, first end surface; 11, cover plate kit; 11a, explosion-proof valve triggering area; 11b, flow guide channel; 11c, air inlet; 11d, air outlet; 11e, air inlet channel; 11f, air outlet channel; 111, cover plate body; 112, lower plastic part; 1121, body; 1122, Limiting portion; 1122a, air flow space; 1122b, first wall portion; 1122c, opening; 1123, diverter; 1123a, baffle; 1123b, guide plate; 1123c, second end surface; 12, top bracket; 12a, exhaust hole; 13, explosion-proof valve; 20, shell; 20a, accommodating cavity; 30, electrode assembly; 40, box body; 41, top cover; 42, bottom cover; 50, battery cell; 60, insulating film. DETAILED DESCRIPTION

[0061] It should be noted that, in the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present invention and should not be regarded as an improper limitation on the present invention.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by technicians in the technical field of the present invention; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" in the specification of the present invention and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions.

[0063] In the description of the embodiments of the present utility model, the technical terms "first", "second", "third", 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 utility model, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0064] 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 invention. 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.

[0065] In the description of the embodiments of the present utility model, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. 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.

[0066] In the description of the embodiments of the present utility model, for the convenience of explanation, as Figure 2 , Figure 3 , Figure 7 , Fig.10 and Fig.18 As shown, the direction of the arrow X is the straight line direction of the "first direction" and the "gravity direction", the direction of x1 represents the "top", and the direction of x2 represents the "bottom"; Figure 3 , Figure 5 , Fig.10 , Fig.11 , Fig.13 , Fig.15 and Fig.17 As shown in FIG. 1 , the direction of arrow Y is the “second direction”; Figure 3 As shown, the direction of arrow Z is referred to as the “third direction”.

[0067] In the description of the embodiments of the present utility model, 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 also be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0068] In the description of the embodiments of the present utility model, unless otherwise clearly stipulated and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact or contact through an intermediate medium layer. It can be contact with essentially no interaction force between the two contacting parties, or it can be contact with interaction force between the two contacting parties.

[0069] At present, batteries are increasingly used in life and industry. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, and aerospace and other fields. With the continuous expansion of battery application areas, the market demand is also constantly expanding.

[0070] Figure 2 The following is a schematic diagram of a three-dimensional exploded view of a battery 100 provided in an embodiment of the present utility model. Figure 2 As shown, the battery 100 includes a case 40 and at least one battery cell 50 .

[0071] The box body 40 includes a top cover 41 and a bottom cover 42 . The top cover 41 is covered on the bottom cover 42 , so that an installation space for placing the battery cell 50 is formed between the bottom cover 42 and the top cover 41 .

[0072] In the battery 100, there can be multiple battery cells 50, and the multiple battery cells 50 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 50 are both connected in series and in parallel. The multiple battery cells 50 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 50 is placed in the accommodation space formed by the bottom cover 42 and the top cover 41; of course, the battery 100 can also be a battery module formed by connecting multiple battery cells 50 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 are accommodated in the accommodation space formed by the bottom cover 42 and the top cover 41. The battery 100 may also include other structures. For example, the battery 100 may also include a converging component for realizing electrical connection between the multiple battery cells 50.

[0073] The battery cell 50 involved in the embodiment of the utility model includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell 50 mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer, and the current collector not coated with the positive electrode active material layer is stacked as a positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, the current collector not coated with the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer, and the current collector not coated with the negative electrode active material layer is stacked as a negative electrode tab. The negative electrode current collector may be made of copper, and the negative electrode active material may be carbon or silicon, etc. The material of the separator may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a wound structure or a laminated structure.

[0074] The battery cell 50 may be a secondary battery. A secondary battery refers to a battery cell 50 that can be continuously used by activating active materials by charging after the battery cell 50 is discharged.

[0075] The battery cell 50 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiment of the utility model.

[0076] The battery cell 50 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. The embodiment of the utility model has no special limitation.

[0077] The battery 100 involved in the embodiment of the present invention refers to a single physical module including one or more battery cells 50 to provide higher voltage and capacity.

[0078] The electric device involved in the embodiment of the utility model is provided with electric energy by the above-mentioned battery, and the electric device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0079] In the following embodiments, for the convenience of description, the electric device of one embodiment of the utility model is taken as a vehicle 1000 as an example for description.

[0080] Figure 1 The structure diagram of a vehicle 1000 provided in one embodiment of the utility model is shown in FIG. 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. Figure 1 As shown, a battery 100 is disposed inside the vehicle 1000, and the battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000. 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 operating power requirements of the vehicle 1000 during driving.

[0081] In some embodiments of the present invention, the battery 100 can be used not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0082] Below, the embodiments of the present utility model are described in detail.

[0083] In the related art, the top bracket in the end cap assembly of the battery cell is located between the electrode assembly and the cover plate assembly to limit and insulate the two. The top bracket is provided with a through exhaust hole, which is directly facing the explosion-proof valve triggering area in the end cap assembly. After the battery cell has thermal runaway, the high-temperature and high-pressure gas generated can pass through the exhaust hole and directly act on the explosion-proof valve triggering area, thereby triggering the explosion-proof valve on the end cap assembly to open, so as to discharge the high-temperature and high-pressure gas from the battery cell.

[0084] In order to ensure that the structural strength of the top bracket meets the requirements of separating the electrode assembly and the cover plate set, and to reduce the probability of impurities such as carbon powder remaining in the electrode assembly passing through the exhaust holes and contacting the cover plate set, the size and number of the exhaust holes on the top bracket are limited, making it difficult for the gas flow rate allowed by the exhaust holes to meet the requirements of triggering the explosion-proof valve triggering area. At the same time, after the battery cell has thermal runaway, the high-temperature and high-pressure gas impacting the top bracket can easily cause the top bracket to deform, making the exhaust holes at risk of being blocked, making it difficult for the gas to act on the explosion-proof valve triggering area, making it impossible for the high-temperature and high-pressure gas to be discharged from the battery cell through the explosion-proof valve in time, making the battery cell at risk of explosion.

[0085] Based on the above technical problems, an embodiment of the utility model provides a battery cell, in which a guide channel is additionally provided in the cover plate kit of the battery cell, which can connect the explosion-proof valve triggering area with the accommodating cavity inside the battery cell, so that in the event of thermal runaway of the battery cell, a part of the high-temperature and high-pressure gas generated can directly impact the explosion-proof valve triggering area through the guide channel, thereby triggering the explosion-proof valve to open more smoothly.

[0086] Specifically, see Figures 3 to 9 The embodiment of the utility model provides a battery cell 50 , and the battery cell 50 includes an end cover assembly 10 and a shell 20 .

[0087] The housing 20 is provided with a receiving chamber 20a, and one side of the receiving chamber 20a is open along the first direction;

[0088] The end cover assembly 10 includes a cover plate set 11 and a top bracket 12. The cover plate set 11 is arranged at the open position of the accommodating cavity 20a, and the top bracket 12 is arranged in the accommodating cavity 20a.

[0089] The cover plate set 11 is provided with an explosion-proof valve triggering area 11a and a flow guide channel 11b;

[0090] At least a portion of the top bracket 12 and the cover plate set 11 are spaced along the first direction to form a confluence space 10a, the explosion-proof valve triggering area 11a is connected to the confluence space 10a, and the top bracket 12 is provided with a through exhaust hole 12a, and the exhaust hole 12a is connected to the confluence space 10a and the accommodating chamber 20a;

[0091] The air outlet 11d of the guide channel 11b is communicated with the converging space 10a, and the air inlet 11c of the guide channel 11b is located in the accommodating chamber 20a and is spaced apart from the inner wall of the accommodating chamber 20a.

[0092] The accommodating cavity 20 a provides an installation location and protection for other components in the battery cell 50 .

[0093] The cover plate assembly 11 covers the opening in the accommodating cavity 20 a so as to form a sealed environment in the accommodating cavity 20 a , thereby reducing the probability of the electrolyte and other components in the accommodating cavity 20 a being separated from the battery cell 50 .

[0094] The cover plate assembly 11 is used to cover the opening of the accommodating cavity 20a of the battery cell 50. The cover plate assembly 11 is provided with components such as a pole and an explosion-proof valve 13.

[0095] The explosion-proof valve triggering region 11 a refers to a structure that can trigger the explosion-proof valve 13 to open due to the impact of high-temperature and high-pressure gas when the battery cell 50 experiences thermal runaway.

[0096] It should be noted that, in the related art, the explosion-proof valve triggering area 11a can be a part of the explosion-proof valve 13 itself, or it can be other structures in the cover plate kit 11 that can drive the explosion-proof valve 13 to open under the impact of gas, or it can include both of the above. Its specific structural form has been used in the related art and will not be described in detail here.

[0097] It is understandable that the battery cell 50 further includes an electrode assembly 30 , which is located in the accommodating cavity 20 a , in which an electrolyte is provided, and an electrochemical reaction occurs between the electrode assembly 30 and the electrolyte to realize the charging and discharging functions of the battery cell 50 .

[0098] It is understandable that after the battery cell 50 experiences thermal runaway, the electrode assembly 30 reacts with the electrolyte to form a large amount of high-temperature and high-pressure gas.

[0099] The top support 12 is located at one side of the cap plate assembly 11 along the first direction so that the top support 12 is located between the cap plate assembly 11 and the electrode assembly 30 .

[0100] The confluence space 10a is used to collect airflow so that the airflow can be discharged in a concentrated manner from the opened explosion-proof valve 13.

[0101] After the battery cell 50 has thermal runaway, part of the generated gas enters the guide channel 11b through the air inlet 11c, and then enters the confluence space 10a through the air outlet 11d, and the other part of the gas enters the confluence space 10a through the exhaust hole 12a. The two parts of gas merge in the confluence space 10a and exert an effect on the explosion-proof valve triggering area 11a. In other words, the high-temperature and high-pressure gas can partially pass through the cover plate kit 11 instead of the top bracket 12, so as to achieve the purpose of triggering the explosion-proof valve 13 to open.

[0102] After the battery cell 50 in the embodiment of the utility model undergoes thermal runaway, at least part of the high-temperature and high-pressure gas can pass through the cover plate kit 11 into the confluence space 10a and then act on the explosion-proof valve triggering area 11a, thereby reducing the probability that the airflow cannot pass through the exhaust hole 12a to trigger the explosion-proof valve 13 to open due to deformation of the top bracket 12; it is beneficial to reduce the size of the exhaust hole 12a, thereby facilitating the improvement of the structural strength of the top bracket 12; it is beneficial to increase the airflow rate entering the confluence space 10a per unit time, thereby being able to more quickly meet the opening conditions of the explosion-proof valve 13, thereby improving the response speed of the explosion-proof valve 13, and reducing the explosion risk of the battery cell 50.

[0103] It can be understood that the electrode assembly 30 is located on one side of the end cap assembly 10 along the first direction.

[0104] In some embodiments, see Figure 3 , Figure 4 , Figure 8 and Fig. 9 , the air inlet 11c is open toward the second direction, and the first direction is perpendicular to the second direction.

[0105] That is, after the battery cell 50 is completely assembled, the air inlet 11 c will not face the electrode assembly 30 .

[0106] In this way, the probability of relative movement of a portion of the electrode assembly 30 without being constrained by the end cover assembly 10 along the first direction is reduced, and the probability of the electrode assembly 30 not being able to undergo normal electrochemical operation due to the relative movement is reduced. At the same time, the probability of solid particles on the electrode assembly 30 entering the guide channel 11b through the air inlet 11c and causing blockage of the guide channel 11b is reduced.

[0107] In the related art, the explosion-proof valve 13 is arranged at the center position of the end cover assembly 10. Therefore, after the battery cell 50 thermally runs away, the gas in the central area of ​​the accommodating cavity 20a of the battery cell 50 can trigger the explosion-proof valve 13 to open faster than the gas in the edge area of ​​the accommodating cavity 20a.

[0108] In some embodiments, see Figure 3 , Figure 4 , Figure 8 and Fig. 9 The air inlet 11c of the guide channel 11b is located at at least one end of the cover plate kit 11 along the second direction, and the first direction is perpendicular to the second direction.

[0109] In this way, the air inlet 11c is closer to the edge area of ​​the accommodating chamber 20a, and the guide channel 11b guides the gas in the edge area of ​​the accommodating chamber 20a into the confluence space 10a, which is conducive to making the gas pressure in the confluence space 10a meet the conditions for triggering the opening of the explosion-proof valve 13 more quickly, which is conducive to improving the response speed of the explosion-proof valve 13.

[0110] It is understandable that the inner wall of the accommodating cavity 20a on one side along the length direction of the cover plate set 11 is farthest from the explosion-proof valve 13, making it difficult for the gas nearby to be discharged through the explosion-proof valve 13 in time.

[0111] In some embodiments, see Figure 3 , the second direction is the length direction of the cover plate kit 11.

[0112] The length direction of the cover plate assembly 11 refers to the straight line direction where the largest dimension of the three-dimensional dimensions of the cover plate assembly 11 is located.

[0113] This helps to make the air inlet 11c closer to the inner wall of the accommodating chamber 20a away from the explosion-proof valve 13, so that the gas in the area of ​​the accommodating chamber 20a away from the explosion-proof valve 13 can be better guided to the confluence space 10a, which is conducive to more rapid discharge of the gas.

[0114] It is understandable that, when the battery cell 50 is in a state of thermal runaway, a large amount of solid impurities will enter the guide channel 11b along with the gas, creating a risk of blocking the guide channel 11b.

[0115] In some embodiments, there are multiple air inlets 11c, so that when some of the air inlets 11c are blocked, the gas can still enter the guide channel 11b through the remaining air inlets 11c, which is conducive to the normal opening of the explosion-proof valve 13.

[0116] The specific arrangement of the plurality of air inlets 11c is not limited.

[0117] For example, see Figure 3 and Figure 4 A first end surface 10b of the cover plate set 11 at one end along the second direction is provided with a plurality of air inlets 11c, and the air inlets 11c are spaced apart along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0118] In this way, on the one hand, the air inlet 11c is not directly facing the electrode assembly 30, which reduces the probability of impurities entering the guide channel 11b through the air inlet 11c under thermal runaway conditions; on the other hand, it is beneficial to reduce the size of the cover plate kit 11 along the first direction, which helps to make the structure of the cover plate kit 11 more compact.

[0119] In the embodiment where the second direction is the length direction of the cover plate set 11 , the third direction is the width direction of the cover plate set 11 .

[0120] The specific number of the air outlets 11d is not limited, and may be one or more.

[0121] In some embodiments, along the flow direction of the air flow, the cross-sectional area of ​​the air inlet 11 c is greater than the cross-sectional area of ​​the air outlet 11 d .

[0122] In this way, the flow rate of the gas passing through the air inlet 11c is smaller than the flow rate of the gas passing through the air outlet 11d, thereby forming a pressure difference, which is conducive to more quickly increasing the pressure of the gas in the confluence space 10a, so that the opening conditions of the explosion-proof valve 13 can be met more quickly, which is conducive to improving the response speed of the explosion-proof valve 13 and reducing the explosion risk of the battery cell 50.

[0123] Along the flow direction of the airflow, the cross-sectional shapes of the air inlet 11c and the air outlet 11d are not limited, such as circular, rectangular, etc. The cross-sectional shapes of the air inlet 11c and the air outlet 11d can be the same or different.

[0124] The specific method of forming the flow guiding channel 11 b is not limited.

[0125] For example, see Figures 6 to 10 The cover plate kit 11 includes a cover plate body 111 and a lower plastic part 112. The lower plastic part 112 is arranged on one side of the cover plate body 111 along the first direction. A confluence space 10a is formed between the lower plastic part and the top bracket 12. The cover plate body 111 and the lower plastic part 112 are jointly surrounded to form a guide channel 11b.

[0126] The cover body 111 is used to form a part of the appearance surface of the battery cell 50. The cover body 111 is provided with components such as an explosion-proof valve 13 and a pole.

[0127] The lower plastic part 112 is used to limit the electrode assembly 30 and can be connected to the insulating film in the battery cell 50 to reduce the risk of short circuit caused by contact between the electrode assembly 30 and the metal shell 20 during the charging and discharging process of the battery cell 50.

[0128] The cover body 111 and the lower plastic part 112 are jointly arranged to form a guide channel 11 b , that is, a portion of the surface of the cover body 111 and a portion of the surface of the lower plastic part 112 jointly form the inner wall of the guide channel 11 b .

[0129] This helps to reduce the manufacturing difficulty of the guide channel 11b, improve the space utilization rate in the cover plate kit 11, make the structure of the cover plate kit 11 more compact, and facilitate cleaning of the guide channel 11b during the disassembly and assembly of the battery cell 50.

[0130] The specific form of the guide channel 11b formed by the cover body 111 and the lower plastic part 112 is not limited. For example, a portion of the guide channel 11b along the airflow direction is located in the cover body 111, and a portion is located in the lower plastic part 112; for another example, a portion of the cross-sectional profile of the guide channel 11b perpendicular to the airflow direction is formed by the cover body 111, and the other portion is formed by the lower plastic part 112.

[0131] It is understandable that a portion of the lower plastic part 112 forms the explosion-proof valve triggering area 11a. For example, the lower plastic part 112 is provided with a plurality of prestressed grooves, the prestressed grooves penetrate the lower plastic part 112 along the first direction, and the annular spacing between the prestressed grooves forms the explosion-proof valve triggering area 11a. After the gas pressure in the confluence space 10a meets the requirements, the structure between the prestressed grooves is broken, so that the gas can break through the explosion-proof valve triggering area 11a and directly act on the explosion-proof valve 13 to open it.

[0132] The specific structural form of the lower plastic part 112 is not limited.

[0133] For example, see Figures 10 to 17 The lower plastic part 112 includes a main body 1121 and at least two limiting parts 1122. The explosion-proof valve triggering area 11a is arranged on the main body 1121. The two limiting parts 1122 are respectively arranged at the opposite ends of the main body 1121 along the second direction. The first direction and the second direction are perpendicular. An airflow space 1122a is arranged in the limiting part 1122. The airflow space 1122a is open on one side along the first direction. The cover body 111 is covered at the open part of the airflow space 1122a to jointly enclose and form a guide channel 11b. One end of the limiting part 1122 away from the cover body 111 along the first direction protrudes from the main body 1121. The top bracket 12 is located between the two limiting parts 1122. The limiting part 1122, the main body 1121 and the top bracket 12 enclose and form a confluence space 10a.

[0134] The pole can pass through the body portion 1121 to be electrically connected to the electrode assembly 30 .

[0135] The main body 1121 and the explosion-proof valve 13 are arranged opposite to each other along a first direction, so that the gas can directly act on the explosion-proof valve 13 after impacting the explosion-proof valve triggering area 11 a.

[0136] The limiting portion 1122 can be used to abut against the electrode assembly 30 along the first direction to limit the electrode assembly 30 along the first direction.

[0137] One end of the limiting portion 1122 that is away from the cover body 111 along the first direction protrudes from the main body 1121, so that the main body 1121 and the electrode assembly 30 can be spaced apart along the first direction, thereby arranging the top bracket 12, the pole ear of the electrode assembly 30, and components such as the adapter plate for connecting the pole ear and the pole in the space formed by the interval.

[0138] In this way, the airflow space 1122a is arranged inside the limiting portion 1122, which can effectively utilize the space inside the limiting portion 1122, which is beneficial to improving the utilization rate of the space inside the battery cell 50; in the process of assembling the cover plate kit 11, the cover plate body 111 is connected to the lower plastic part 112 along the first direction, and the guide channel 11b is formed at the same time, which is beneficial to simplify the manufacturing and assembly steps.

[0139] The top bracket 12 may be connected to the main body 1121 , may be connected to the limiting portion 1122 , or may be connected to both.

[0140] In some embodiments, one of the limiting portion 1122 and the top bracket 12 is provided with a buckle, and the other is provided with a buckle hole. The connection between the limiting portion 1122 and the top bracket 12 is achieved by snapping together the inner wall of the buckle hole and the buckle, so as to improve the assembly efficiency between the limiting portion 1122 and the top bracket 12.

[0141] In some embodiments, see Figures 5 to 7 , Fig.11 and Fig.12 The airflow space 1122a is partially opened on one side away from the main body 1121 along the second direction to form an air inlet 11c, and the limiting portion 1122 is provided with an air outlet 11d on the surface of one side close to the main body 1121 along the second direction along the part protruding from the main body 1121.

[0142] In this way, it is beneficial to achieve the purpose that the air inlet 11 c is not facing the electrode assembly 30, and it is beneficial to shorten the length of the flow path of the airflow along the second direction so that the airflow can enter the confluence space 10a more quickly.

[0143] A side of the airflow space 1122a along the second direction away from the main body 1121 is at least partially opened to form an air inlet 11c.

[0144] It can be understood that, each limiting portion 1122 is provided with an airflow space 1122 a , and the opening directions of the two airflow spaces 1122 a along the second direction are opposite to each other.

[0145] It is understandable that a seam is formed between the cover body 111 and the main body 1121. If the airflow enters between the cover body 111 and the main body 1121 through the seam between the two, the airflow will be diverted, which is not conducive to the air pressure in the confluence space 10a reaching the pressure that triggers the explosion-proof valve 13 to open more quickly.

[0146] In some embodiments, see Figure 7 and Fig.12 The limiting portion 1122 includes a first wall portion 1122b, and a surface of one side of the first wall portion 1122b along the second direction forms at least a portion of the inner wall of the airflow space 1122a along the second direction close to the main body portion 1121. The first wall portion 1122b is in contact with the cover body 111 along the first direction, and the air outlet 11d is arranged on the first wall portion 1122b, and the air outlet 11d is spaced apart from the cover body 111 along the first direction.

[0147] The wall portion refers to the physical structure corresponding to each inner wall surrounding and forming the airflow space 1122a.

[0148] The first wall portion 1122 b fits the cover body 111 so that no gap exists between the first wall portion 1122 b and the cover body 111 .

[0149] In this way, the joint between the cover body 111 and the main body 1121 will not be directly connected to the air outlet 11d, so that the airflow will not directly enter between the cover body 111 and the main body 1121 through the air outlet 11d when flowing through the air outlet 11d; at the same time, due to the blocking and guiding effect of the first wall portion 1122b, the airflow in the guide channel 11b is guided to flow to the air outlet 11d rather than the fitting position between the first wall portion 1122b and the cover body 111.

[0150] In some embodiments, see Fig.14 The guide channel 11b extends along the second direction and has only one air inlet 11c and one air outlet 11d. In this way, the structure of the guide channel 11b is simplified and the manufacturing cost is reduced.

[0151] In some embodiments, see Figure 7 , Fig. 9 , Fig.12 and Fig.13 , Figures 15 to 17 The guide channel 11b includes an air inlet channel 11e and an air outlet channel 11f. The number of the air inlet channels 11e is multiple. The outlet of the air outlet channel 11f along the air flow direction forms an air outlet 11d, and the inlet of the air inlet channel 11e along the air flow direction forms an air inlet 11c. The outlet of each air inlet channel 11e along the air flow direction is connected to the inlet of the air outlet channel 11f along the air flow direction.

[0152] That is to say, the same guide channel 11b is correspondingly configured with multiple air inlets 11c and one air outlet 11d. The air flows through the multiple air inlets 11c and enters the multiple air inlet channels 11e respectively, and then converges into the air outlet channel 11f, and then is discharged into the confluence space 10a from the outlet of the air outlet channel 11f, namely the air outlet 11d.

[0153] In this way, even if part of the air inlet channel 11e is in a blocked state, the guide channel 11b can still remain unobstructed, so that the airflow can enter the confluence space 10a normally; it is beneficial to make the sum of the cross-sectional areas of each air inlet channel 11e perpendicular to the airflow direction larger than the cross-sectional area of ​​the air outlet channel 11f perpendicular to the airflow direction, thereby facilitating the formation of a pressure difference, which is beneficial to more quickly increase the pressure of the gas in the confluence space 10a; at the same time, it is beneficial to arrange the inlets of each air inlet channel 11e at different positions of the cover plate kit 11, and arrange the air outlet 11d at a position closer to the explosion-proof valve trigger area 11a, so as to gather the airflows at different positions to directly act on the explosion-proof valve trigger area 11a, which is beneficial to improve the response speed of the explosion-proof valve 13 when opening.

[0154] Multiple means at least two.

[0155] The specific method of forming the plurality of intake passages 11 e is not limited.

[0156] For example, see Fig.13 , Figures 15 to 17 The cover plate kit 11 is provided with an air flow space 1122a, the air flow space 1122a is connected with the confluence space 10a and forms an air outlet 11d, a part of the air flow space 1122a is opened to form an opening 1122c, a diverter 1123 is provided in the air flow space 1122a, the diverter 1123 connects the side walls on the opposite sides of the air flow space 1122a to separate a part of the air flow space 1122a to form a plurality of air inlet channels 11e, and separates the opening 1122c to form a plurality of air inlets 11c.

[0157] It can be understood that the size of the diverter 1123 along the airflow direction is smaller than the size of the guide channel 11b along the airflow direction, and the diverter 1123 and the air outlet 11d are spaced apart along the airflow direction.

[0158] One end of the flow divider 1123 close to the upstream along the airflow direction and the edge of the opening 1122c are together arranged to form the air inlet 11c.

[0159] In this way, the purpose of forming a plurality of air inlet channels 11 e is achieved through the flow divider 1123 , and at the same time, the air inlets 11 c of the air inlet channels 11 e are arranged at intervals from each other.

[0160] It can be understood that each air inlet 11c of the same air guiding channel 11b is a part of the open opening 1122c of the same air flow space 1122a.

[0161] The specific number of the flow dividers 1123 provided in the air flow space 1122a is not limited, and may be one or more.

[0162] In some embodiments, the opening 1122c is located on the first end surface 10b of the cover plate assembly 11 at one end along the second direction, and the first direction is perpendicular to the second direction.

[0163] In this way, the purpose of the air inlet 11 c being located at at least one end of the cover plate assembly 11 along the second direction and being open toward the second direction is achieved.

[0164] In some embodiments, see Fig.18The battery cell further includes an insulating film 60 and an electrode assembly 30, both of which are disposed in the accommodating cavity 20a, and a portion of the insulating film 60 is located between the electrode assembly 30 and the inner wall of the accommodating cavity 20a to separate the electrode assembly 30 from the housing 20. The insulating film 60 serves as an insulator to reduce the risk of a short circuit caused by contact between the housing 20 and the electrode assembly 30.

[0165] The insulating film 60 is connected to the cover plate assembly 11 to achieve fixation.

[0166] When the insulating film 60 is connected to the cover plate assembly 11 , the insulating film 60 will cover at least a portion of the air inlet 11 c , so that the structure of the connection position between the two is more compact.

[0167] In some embodiments, see Fig.12 and Fig.16 The surface of the diverter 1123 close to the opening 1122c along the second direction is the second end surface 1123c, the second end surface 1123c is flush with the first end surface 10b, and a portion of the insulating film 60 is fixed to the first end surface 10b and the second end surface 1123c.

[0168] The flow dividing member 1123 is close to one end of the opening 1122c along the second direction, and is jointly surrounded with the edge of a portion of the opening 1122c to form the air inlet 11c.

[0169] This is conducive to reducing the size of a single air inlet 11c and improving the structural strength of the cover kit 11; it is conducive to increasing the contact area between the insulating film 60 and the cover kit 11, making the connection between the two more secure, and reducing the probability of damage caused by the reduced structural strength of the insulating film 60 in this part due to the larger size of the air inlet 11c covered by the insulating film 60.

[0170] In some embodiments, the insulating film covers at least a portion of the air inlet 11c and is sandwiched between the inner wall of the accommodating cavity 20a and the end cover assembly 10, which helps to reduce the probability of impurities entering the guide channel 11b and blocking the guide channel 11b.

[0171] It should be noted that in the embodiment where the insulating film 60 covers at least a portion of the air inlet 11 c , when the battery cell 50 is in thermal runaway, the high-temperature and high-pressure gas can break through the insulating film 60 and enter the guide channel 11 b .

[0172] There is no limitation on the specific method of fixing the insulating film 60 to the first end surface 10b and the second end surface 1123c, such as bonding.

[0173] The specific shape of the diverter 1123 is not limited.

[0174] In some embodiments, see Fig.15and Fig.16 The flow divider 1123 includes a baffle 1123a and a guide plate 1123b. The surface of the baffle 1123a on the first side along the second direction is flush with the first end face 10b. The edge of the baffle 1123a and a partial edge of the opening 1122c are arranged to form an air inlet 11c. The guide plate 1123b is arranged on the second side of the baffle 1123a along the second direction and extends along the second direction.

[0175] In this way, the baffle 1123a can be used to connect with the insulating film 60, and at the same time achieve the purpose of separating the opening 1122c to form the air inlet 11c; the guide plate 1123b achieves the purpose of separating a part of the air flow space 1122a to form the air inlet channel 11e, and at the same time, the guide plate 1123b can guide the airflow in the air inlet channel 11e to move along the second direction; the guide plate 1123b and the baffle 1123a have a simple structure and are easy to manufacture.

[0176] In some embodiments, see Fig.16 The baffle 1123a is connected to the guide plate 1123b at a middle position along the third direction, which is conducive to making the two air inlet channels 11e separated by the guide plate 1123b have the same shape and size.

[0177] In some embodiments, see Fig.13 and Fig.17 The cross-sectional area of ​​the diverter 1123 perpendicular to the second direction gradually decreases along the second direction close to the air outlet 11d.

[0178] In this way, the air inlet channels 11e separated by the diverter 1123 are brought closer to each other along the flow direction of the airflow until they merge with the air outlet channel 11f, which helps reduce the turning amplitude of the airflow in the air inlet channel 11e and makes the airflow flow more smoothly in the guide channel 11b.

[0179] In some embodiments, see Fig.13 In the projection perpendicular to the first direction, the cross-sectional shape of the diverter 1123 is a trapezoid.

[0180] In this way, the purpose of bringing the air inlet channels 11 e separated by the flow divider 1123 closer to each other along the flow direction of the airflow until they merge with the air outlet channels 11 f is achieved.

[0181] In some embodiments, see Fig.13 In the projection perpendicular to the first direction, the cross-sectional shape of the diverter 1123 is semicircular.

[0182] In this way, the amplitude of the turning of the airflow in the air inlet passage 11e is made smoother, thereby reducing the pressure loss of the gas, and further increasing the response speed of triggering the explosion-proof valve triggering area 11a.

[0183] A specific embodiment of the utility model is as follows:

[0184] A battery cell 50 includes a shell 20, an end cover assembly 10, an electrode assembly 30 and an insulating film 60. The shell 20 is provided with a accommodating cavity 20a, and the accommodating cavity 20a is open on one side along a first direction. The end cover assembly 10 includes a cover plate set 11 and a top bracket 12. The top bracket 12 is located in the accommodating cavity 20a and is provided on one side of the cover plate set 11 along the first direction. At least a portion of the top bracket 12 and the cover plate set 11 are spaced apart along the first direction to form a confluence space 10a. The electrode assembly 30 is located in the accommodating cavity 20a and is located on the side of the top bracket 12 away from the cover plate set 11 along the first direction. A portion of the insulating film 60 is located between the electrode assembly 30 and the inner wall of the accommodating cavity 20a to separate the electrode assembly 30 from the shell 20. The cover plate kit 11 is provided with an explosion-proof valve triggering area 11a and a guide channel 11b, the air outlet 11d of the guide channel 11b is communicated with the confluence space 10a, the air inlet 11c of the guide channel 11b is used to accommodate the airflow in the cavity 20a to enter the guide channel 11b, along the flow direction of the airflow, the cross-sectional area of ​​the air inlet 11c is greater than the cross-sectional area of ​​the air outlet 11d, the cover plate kit 11 includes a cover plate body 111 and a lower plastic part 112, the lower plastic part 112 includes a main body 1121 and at least two limit parts 1122, the explosion-proof valve triggering area 11a is provided on the main body 1121, the two limit parts 112 2 are respectively arranged at two opposite ends of the body part 1121 along the second direction, the first direction is perpendicular to the second direction, an airflow space 1122a is arranged in the limiting part 1122, and one side of the airflow space 1122a is open along the first direction, the cover body 111 is covered at the open part of the airflow space 1122a to jointly enclose and form a guide channel 11b, one end of the limiting part 1122 away from the cover body 111 along the first direction protrudes from the body part 1121, the top bracket 12 is located between the two limiting parts 1122, and the limiting part 1122, the body part 1121 and the top bracket 12 enclose and form a converging space 10a. The limiting portion 1122 includes a first wall portion 1122b, a side surface of the first wall portion 1122b along the second direction forms at least a portion of the inner wall of the airflow space 1122a close to the main body portion 1121 along the second direction, the first wall portion 1122b is in contact with the cover body 111 along the first direction, the air outlet 11d is provided on the first wall portion 1122b, and the air outlet 11d is spaced apart from the cover body 111 along the first direction. The flow guiding channel 11b includes an air inlet channel 11e and an air outlet channel 11f, the number of the air inlet channels 11e is multiple, the outlet of the air outlet channel 11f along the airflow direction forms the air outlet 11d, the inlet of the air inlet channel 11e along the airflow direction forms the air inlet 11c, and the outlet of each air inlet channel 11e along the airflow direction is connected to the inlet of the air outlet channel 11f along the airflow direction.The airflow space 1122a is connected to the confluence space 10a and forms an air outlet 11d. A part of the airflow space 1122a is opened to form an opening 1122c. A flow divider 1123 is provided in the airflow space 1122a. The flow divider 1123 connects the side walls of the airflow space 1122a on opposite sides to separate a part of the airflow space 1122a to form a plurality of air inlet channels 11e, and separates the opening 1122c to form a plurality of air inlets 11c. The opening 1122c is located on the first end surface 10b at one end of the cover plate kit 11 along the second direction. The surface of the flow divider 1123 near the end of the opening 1122c along the second direction is the second end surface 1123c. The second end surface 1123c is flush with the first end surface 10b. A part of the insulating film 60 is fixed to the first end surface 10b and the second end surface 1123c. In the projection perpendicular to the first direction, the cross-sectional shape of the flow divider 1123 is semicircular.

[0185] The embodiment of the utility model further provides an end cover assembly 10 , which is used to cover the opening of the accommodating cavity 20 a of the battery cell 50 . The end cover assembly 10 includes a cover plate set 11 and a top bracket 12 .

[0186] The cover plate kit 11 is provided with an explosion-proof valve triggering area 11a and a guide channel 11b; the top bracket 12 is arranged on one side of the cover plate kit 11 along the first direction, and at least a part of the top bracket 12 and the cover plate kit 11 are spaced along the first direction to form a confluence space 10a, the explosion-proof valve triggering area 11a is connected with the confluence space 10a, the top bracket 12 is provided with a through exhaust hole 12a, the exhaust hole 12a connects the confluence space 10a with the accommodating chamber 20a; the air outlet 11d of the guide channel 11b is connected with the confluence space 10a, and the air inlet 11c of the guide channel 11b is used for the airflow in the accommodating chamber 20a to enter the guide channel 11b.

[0187] In the end cover assembly 10 of the embodiment of the utility model, after the battery cell 50 has thermal runaway, at least part of the high-temperature and high-pressure gas can pass through the cover plate kit 11 into the confluence space 10a and then act on the explosion-proof valve triggering area 11a, thereby reducing the probability that the airflow cannot pass through the exhaust hole 12a of the top bracket 12 to trigger the opening of the explosion-proof valve 13 due to the deformation of the top bracket 12; it is beneficial to reduce the size of the original exhaust hole 12a on the top bracket 12, thereby facilitating the improvement of the structural strength of the top bracket 12; it is beneficial to increase the airflow rate entering the confluence space 10a per unit time, thereby being able to more quickly meet the opening conditions of the explosion-proof valve 13, and facilitating the improvement of the response speed of the explosion-proof valve 13.

[0188] In some embodiments, see Figures 10 to 17The cover plate kit includes a cover plate body 111 and a lower plastic part 112. The lower plastic part 112 is arranged on one side of the cover plate body 111 along the first direction. A confluence space 10a is formed between the lower plastic part 112 and the top bracket 12. The lower plastic part 112 includes a body part 1121 and at least two limit parts 1122. The explosion-proof valve triggering area 11a is arranged on the body part 1121. The two limit parts 1122 are respectively arranged at opposite ends of the body part 1121 along the second direction. The first direction and the second direction are perpendicular. An airflow space 1122a is provided in the positioning portion 1122, and the airflow space 1122a is open on one side along the first direction. The cover body 111 is covered on the open part of the airflow space 1122a to jointly form a guide channel 11b. The limiting portion 1122 protrudes from the main body 1121 at one end away from the cover body 111 along the first direction. The top bracket 12 is located between the two limiting portions 1122, and the limiting portion 1122, the main body 1121 and the top bracket 12 are arranged to form a confluence space 10a.

[0189] In this way, the airflow space 1122a is arranged inside the limiting portion 1122, which can effectively utilize the space inside the limiting portion 1122, which is beneficial to improving the utilization rate of the space inside the battery cell 50; in the process of assembling the cover plate kit 11, the cover plate body 111 is connected to the lower plastic part 112 along the first direction, and the guide channel 11b is formed at the same time, which is beneficial to simplify the manufacturing and assembly steps.

[0190] In some embodiments, see Figure 7 and Fig.12 The limiting portion 1122 includes a first wall portion 1122b, and a surface of one side of the first wall portion 1122b along the second direction forms at least a portion of the inner wall of the airflow space 1122a along the second direction close to the main body portion 1121. The first wall portion 1122b is in contact with the cover body 111 along the first direction, and the air outlet 11d is arranged on the first wall portion 1122b, and the air outlet 11d is spaced apart from the cover body 111 along the first direction.

[0191] In this way, the joint between the cover body 111 and the main body 1121 will not be directly connected to the air outlet 11d, so that the airflow will not directly enter between the cover body 111 and the main body 1121 through the air outlet 11d when flowing through the air outlet 11d; at the same time, due to the blocking and guiding effect of the first wall portion 1122b, the airflow in the guide channel 11b is guided to flow to the air outlet 11d rather than the fitting position between the first wall portion 1122b and the cover body 111.

[0192] In some embodiments, see Fig.13 , Figures 15 to 17The cover plate kit 11 is provided with an air flow space 1122a, the air flow space 1122a is connected with the confluence space 10a and forms an air outlet 11d, a part of the air flow space 1122a is opened to form an opening 1122c, and a diverter 1123 is provided in the air flow space 1122a, the diverter 1123 connects the side walls on the opposite sides of the air flow space 1122a to separate a part of the air flow space 1122a to form a plurality of air inlet channels 11e, and separates the opening 1122c to form a plurality of air inlet channels 11c, and another part of the air flow space 1122a forms an air outlet channel 11f, and the outlet of the air outlet channel 11f along the air flow direction forms an air outlet 11d, and the outlet of each air inlet channel 11e along the air flow direction is connected with the inlet of the air outlet channel 11f along the air flow direction.

[0193] In this way, even if part of the air inlet channel 11e is in a blocked state, the guide channel 11b can still remain unobstructed, so that the airflow can enter the confluence space 10a normally; it is beneficial to make the sum of the cross-sectional areas of each air inlet channel 11e perpendicular to the airflow direction larger than the cross-sectional area of ​​the air outlet channel 11f perpendicular to the airflow direction, thereby facilitating the formation of a pressure difference, which is beneficial to more quickly increase the pressure of the gas in the confluence space 10a; at the same time, it is beneficial to arrange the inlets of each air inlet channel 11e at different positions of the cover plate kit 11, and arrange the air outlet 11d at a position closer to the explosion-proof valve trigger area 11a, so as to gather the airflows at different positions to directly act on the explosion-proof valve trigger area 11a, which is beneficial to improve the response speed of the explosion-proof valve 13 when opening.

[0194] The embodiment of the utility model further provides a battery 100, which includes a box body 40 and the battery cell 50 in the above embodiment. An installation space is provided in the box body 40, and the battery cell 50 is arranged in the installation space.

[0195] The installation space provides an installation location and a protective function for the battery cell 50 .

[0196] In this way, by adopting the battery cell 50 in the aforementioned embodiment, the probability of explosion in the case of thermal runaway of the battery cell 50 is reduced, and the gas generated by thermal runaway is discharged more promptly.

[0197] In some embodiments, see Figure 2 and Fig.18 The first direction is the direction of gravity. The battery cell 50 also includes an electrode assembly 30. The accommodating cavity 20a is open on the bottom side along the first direction. The electrode assembly 30 is located in the accommodating cavity 20a. The top bracket 12 is located between the cover plate kit 11 and the electrode assembly 30 to support the electrode assembly 30.

[0198] That is, the cover plate set 11 is located at the bottom side of the electrode assembly 30 , and the cover plate set 11 supports the top support 12 .

[0199] It can be understood that, under the action of gravity, the electrode assembly 30 tends to move toward the cover plate assembly 11 .

[0200] In this way, by supporting the electrode assembly 30 through the top bracket 12, on the one hand, the probability of short circuit caused by contact between the electrode assembly 30 and the cover plate kit 11 is reduced; on the other hand, the top bracket 12 can play a shielding role, reducing the probability of foreign matter remaining in the electrode assembly 30 falling onto the cover plate kit 11 under the action of gravity and causing a short circuit.

[0201] The embodiment of the utility model further provides an electric device, which includes the battery 100 in the above embodiment, and the battery 100 is used as a power source of the electric device.

[0202] In this way, by adopting the battery 100 in the aforementioned embodiment, the probability of explosion when the battery cell 50 suffers from thermal runaway is reduced, which helps to improve the safety of the electrical device.

[0203] The various embodiments / implementations provided by the present invention can be combined with each other without causing any contradiction.

[0204] The above are only preferred embodiments of the present invention and are not intended to limit the embodiments of the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present invention shall be included in the protection scope of the embodiments of the present invention.

Claims

1. A battery cell, characterized in that: The battery cell comprises: A housing is provided with a receiving cavity, wherein one side of the receiving cavity is open along a first direction; An end cover assembly, the end cover assembly comprising a cover plate set and a top bracket, the cover plate set is arranged at an open position of the accommodating cavity, the top bracket is arranged in the accommodating cavity, at least part of the top bracket and the cover plate set are spaced along the first direction to form a confluence space, the cover plate set is provided with an explosion-proof valve triggering area and a guide channel, the explosion-proof valve triggering area is communicated with the confluence space, the top bracket is provided with a through exhaust hole, and the exhaust hole communicates the confluence space with the accommodating cavity; The air outlet of the guide channel is communicated with the confluence space, and the air inlet of the guide channel is located in the accommodating cavity and is spaced apart from the inner wall of the accommodating cavity.

2. The battery cell according to claim 1, characterized in that: The air inlet is open toward a second direction, and the first direction is perpendicular to the second direction.

3. The battery cell according to claim 1, characterized in that: At least part of the air inlet is located at at least one end of the cover plate kit along a second direction, and the first direction is perpendicular to the second direction.

4. The battery cell according to claim 3, characterized in that: The second direction is the length direction of the cover plate kit.

5. The battery cell according to claim 3, characterized in that: A plurality of the air inlets are provided on a first end surface of the cover plate kit at one end along the second direction, and the air inlets are spaced apart along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

6. The battery cell according to claim 1, characterized in that: Along the flow direction of the air flow, the cross-sectional area of ​​the air inlet is larger than the cross-sectional area of ​​the air outlet.

7. The battery cell according to claim 1, characterized in that: The cover plate kit includes a cover plate body and a lower plastic part, wherein the lower plastic part is arranged on one side of the cover plate body along the first direction, the confluence space is formed between the lower plastic part and the top bracket, and the cover plate body and the lower plastic part are jointly arranged to form the guide channel.

8. The battery cell according to claim 7, characterized in that: The lower plastic part includes a main body and at least two limiting parts, the explosion-proof valve triggering area is arranged on the main body, and the two limiting parts are respectively arranged at opposite ends of the main body along the second direction, the first direction and the second direction are perpendicular, an air flow space is arranged in the limiting part, and the air flow space is open on one side along the first direction, the cover body is covered at the opening of the air flow space to jointly enclose and form the guide channel, and one end of the limiting part away from the cover body along the first direction protrudes from the main body, and the top bracket is located between the two limiting parts, and the limiting part, the main body and the top bracket are enclosed to form the confluence space.

9. The battery cell according to claim 8, characterized in that: The limiting portion includes a first wall portion, and a side surface of the first wall portion along the second direction forms at least a portion of the inner wall of the airflow space along the second direction close to the main body portion. The first wall portion is in contact with the cover body along the first direction, and the air outlet is arranged on the first wall portion, and the air outlet is spaced apart from the cover body along the first direction.

10. The battery cell according to claim 1, characterized in that: The guide channel extends along a second direction and has only one air inlet and one air outlet, and the first direction is perpendicular to the second direction.

11. The battery cell according to claim 1, characterized in that: The guide channel includes an air inlet channel and an air outlet channel. The number of the air inlet channels is multiple. The outlet of the air outlet channel along the air flow direction forms the air outlet, and the inlet of the air inlet channel along the air flow direction forms the air inlet. The outlet of each air inlet channel along the air flow direction is connected to the inlet of the air outlet channel along the air flow direction.

12. The battery cell according to claim 11, characterized in that: The cover plate kit is provided with an airflow space, the airflow space is connected with the confluence space and forms the air outlet, a part of the airflow space is opened to form an opening, a diverter is provided in the airflow space, the diverter connects the side walls on opposite sides of the airflow space to separate a part of the airflow space to form a plurality of the air inlet channels, and separates the opening to form a plurality of the air inlets.

13. The battery cell according to claim 12, characterized in that: The battery cell also includes an insulating film and an electrode assembly, both of which are arranged in the accommodating cavity, a portion of the insulating film is located between the electrode assembly and the inner wall of the accommodating cavity to separate the electrode assembly from the shell, the opening is located on the first end face of one end of the cover plate kit along the second direction, the first direction is perpendicular to the second direction, the surface of the diverter piece close to the open end along the second direction is the second end face, the second end face is flush with the first end face, and a portion of the insulating film is fixed to the first end face and the second end face.

14. The battery cell according to claim 13, characterized in that: The diverter includes a baffle and a guide plate, the surface of the baffle on the first side along the second direction forms the second end face, the edge of the baffle and the edge of the open portion are arranged to form the air inlet, and the guide plate is arranged on the second side of the baffle along the second direction and extends along the second direction.

15. The battery cell according to claim 13, characterized in that: The cross-sectional area of ​​the flow dividing member perpendicular to the second direction gradually decreases in a direction close to the air outlet along the second direction.

16. The battery cell according to claim 15, characterized in that: In a projection perpendicular to the first direction, a cross-sectional shape of the flow divider is a trapezoid or a semicircle.

17. An end cap assembly, used to cover the opening of a receiving cavity of a battery cell, characterized in that: The end cap assembly comprises: Cover kit with explosion-proof valve trigger area and diversion channel; A top bracket is arranged at one side of the cover plate set along a first direction, at least a portion of the top bracket and the cover plate set are spaced along the first direction to form a confluence space, the explosion-proof valve triggering area is connected to the confluence space, and the top bracket is provided with a through exhaust hole, and the exhaust hole is used to connect the confluence space and the accommodating cavity; The air outlet of the guide channel is communicated with the confluence space, and the air inlet of the guide channel is used for the airflow in the accommodating cavity to enter the guide channel.

18. The end cap assembly according to claim 17, wherein: The cover plate kit includes a cover plate body and a lower plastic part, the lower plastic part is arranged on one side of the cover plate body along the first direction, the confluence space is formed between the lower plastic part and the top bracket, the lower plastic part includes a main body and at least two limiting parts, the explosion-proof valve triggering area is arranged on the main body, the two limiting parts are respectively arranged at the opposite ends of the main body along the second direction, the first direction is perpendicular to the second direction, an airflow space is provided in the limiting part, and the airflow space is open on one side along the first direction, the cover plate body is covered at the opening of the airflow space to jointly enclose and form the guide channel, the limiting part protrudes from the main body at one end away from the cover plate body along the first direction, the top bracket is located between the two limiting parts, and the limiting part, the main body and the top bracket enclose and form the confluence space.

19. The end cap assembly according to claim 18, characterized in that The limiting portion includes a first wall portion, and a side surface of the first wall portion along the second direction forms at least a portion of the inner wall of the airflow space along the second direction close to the main body portion. The first wall portion is in contact with the cover body along the first direction, and the air outlet is arranged on the first wall portion, and the air outlet is spaced apart from the cover body along the first direction.

20. The end cap assembly according to claim 17, wherein: The cover plate kit is provided with an air flow space, the air flow space is connected with the confluence space and forms the air outlet, a part of the air flow space is opened to form an opening, a diverter is provided in the air flow space, the diverter connects the side walls on opposite sides of the air flow space to separate a part of the air flow space to form a plurality of air inlet channels, and separates the opening to form a plurality of air inlets, and another part of the air flow space forms an air outlet channel, the outlet of the air outlet channel along the air flow direction forms the air outlet, and the outlet of each air inlet channel along the air flow direction is connected with the inlet of the air outlet channel along the air flow direction.

21. A battery, characterized in that: The battery comprises a box body and a battery cell as claimed in any one of claims 1 to 16, wherein an installation space is provided in the box body, and the battery cell is arranged in the installation space.

22. The battery according to claim 21, characterized in that The first direction is the direction of gravity, the battery cell further includes an electrode assembly, the accommodating cavity is open at the bottom side along the first direction, the electrode assembly is located in the accommodating cavity, and the top bracket is located between the cover plate kit and the electrode assembly to support the electrode assembly.

23. An electrical device, characterized in that: The electrical device comprises the battery as claimed in claim 21 or 22, and the battery is used as a power source for the electrical device.

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