Battery monomer, battery and electric device

Abstract

The invention provides a single battery, a battery and a power utilization device, and the single battery comprises a shell which is provided with an accommodating space and an opening communicated with the accommodating space; the electrode assembly is accommodated in the accommodating space; the end cover seals the opening; the electrode terminal is arranged on the shell, and the electrode terminal is electrically connected with the electrode assembly; and the pressure relief part is arranged on the end cover, and the pressure relief part is used for relieving the internal pressure of the shell. According to the technical scheme, the electrode terminal and the pressure relief part of the battery monomer are arranged on different planes, so that the risk that the electrode terminal is short-circuited due to the fact that conductive emissions discharged by the pressure relief part conduct the electrode terminal when the battery monomer is in thermal runaway can be reduced; meanwhile, the pressure relief part is arranged on the independent end cover tending to be planar, the thickness can be adjusted according to the design requirement of the pressure relief part, the machining precision of the pressure relief part can be improved, and the structural reliability and the performance reliability of the pressure relief part are integrally improved. And the reliability of the performance of the battery monomer is further improved by improving the reliability of the pressure relief part.

Description

Battery cells, batteries and electrical devices Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] In battery technology, how to improve battery reliability is a technical problem that needs to be solved urgently.

[0004] Summary of the Invention

[0005] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can improve the reliability of the battery.

[0006] In a first aspect, the present application provides a battery cell, comprising: a shell having a accommodating space and an opening connected to the accommodating space; an electrode assembly accommodated in the accommodating space; an end cover closing the opening; an electrode terminal disposed in the shell, the electrode terminal being electrically connected to the electrode assembly; and a pressure relief portion disposed in the end cover, the pressure relief portion being used to release the internal pressure of the shell.

[0007] In the technical solution of the present application, the electrode terminals and pressure relief portion of the battery cell are arranged on different surfaces. Compared to structures where the electrode terminals and pressure relief portion are arranged on the same surface, this reduces the risk of conductive emissions discharged through the pressure relief portion conducting to the electrode terminals during thermal runaway of the battery cell, causing a short circuit at the electrode terminals, thereby improving the performance stability of the battery cell. Furthermore, by arranging the pressure relief portion on a separate, planar end cap, the difficulty of directly machining the pressure relief portion on the end cap is far less than that of machining the pressure relief portion on the wall of the housing. The pressure relief portion requires higher machining precision, and arranging the pressure relief portion on the easier-to-machine end cap facilitates the design of complex pressure relief portions, improving the design flexibility and machining precision of the pressure relief portion. Furthermore, the housing is formed by stamping, and due to the limitations of the stamping process, the wall thickness of each surface does not vary much. To avoid material waste and maintain the energy density of the battery cell, the wall of the housing is relatively thin, which is not conducive to improving the machining precision of the pressure relief portion. As a separate component, the end cap can be adjusted in thickness according to the design requirements of the pressure relief portion, which also helps improve the machining precision of the pressure relief portion and overall improves the structural and performance reliability of the pressure relief portion. By improving the reliability of the pressure relief portion, the performance reliability of the battery cell is further improved.

[0008] According to some embodiments of the present application, a first groove is provided on a side of the end cover facing away from the electrode assembly, and the pressure relief portion is provided on a bottom wall of the first groove.

[0009] In the above technical solution, a first groove recessed toward the interior of the battery cell is provided on the side of the end cover facing away from the electrode assembly, and the pressure relief portion is provided on the bottom wall of the first groove. The pressure relief portion is provided in the concave area of ​​the end cover, which can play a certain protective role for the pressure relief portion, reduce the risk of the pressure relief portion being worn or damaged by the external environment, and thereby reduce the risk of the pressure relief portion opening prematurely, and reduce the risk of the pressure relief pressure required for the pressure relief portion increasing due to the pressure relief portion being blocked by other components, thereby improving the functional stability of the pressure relief portion, and thereby helping to improve the performance reliability of the battery cell during use.

[0010] According to some embodiments of the present application, the end cover includes a cover body and a first protrusion, the cover body is arranged around the first protrusion, and the first protrusion protrudes from the cover body in a direction away from the interior of the shell.

[0011] In the above technical solution, a first protrusion is provided on the side of the end cap facing away from the electrode assembly. When the battery is grouped, the first protrusion on the end cap can be used to limit the battery cell using a concave-convex matching structure with the battery case or other supporting components of the battery cell, which is beneficial to improving the positioning stability of the battery cell. According to some embodiments of the present application, the first protrusion includes a first top wall and a first side wall, the first side wall is arranged around the first top wall, the first side wall connects the first top wall and the cover body, and the first top wall and the first side wall enclose a first concave cavity that is connected to the accommodating space.

[0012] In the above technical solution, a first concave cavity is formed at a position corresponding to the above-mentioned first convex portion on the inner surface (second surface) of the end cover facing the electrode assembly, which is beneficial to expanding the internal space of the battery cell and increasing the effective volume of the battery cell without increasing the overall battery size, which is beneficial to improving the energy density of the battery cell.

[0013] According to some embodiments of the present application, the pressure relief portion is provided on the first top wall.

[0014] In the above technical solution, the pressure relief portion is arranged on the first top wall of the first convex portion, and the interior of the first convex portion is a first concave cavity. The first concave cavity can play a certain convergence role. When the battery cell suffers thermal runaway, the first concave cavity can provide a buffer zone for the discharged material, which is conducive to the smooth discharge of the discharged material, thereby helping to improve the performance reliability of the battery cell.

[0015] According to some embodiments of the present application, a first groove is provided on a side of the first top wall facing away from the interior of the shell, and the pressure relief portion is provided on a bottom wall of the first groove.

[0016] In the above technical solution, the pressure relief part is arranged in the concave area on the first convex part, which can play a certain protective role on the pressure relief part, reduce the risk of the pressure relief part being worn or damaged by the external environment, and thus reduce the risk of the pressure relief part opening the valve prematurely, and can reduce the risk of the pressure relief pressure required by the pressure relief part rising due to the pressure relief part being blocked by other components, thereby improving the functional stability of the pressure relief part, and thus helping to improve the performance reliability of the battery cell during use.

[0017] According to some embodiments of the present application, the shell includes a shell body and a second protrusion, the shell body is arranged around the second protrusion, and the second protrusion protrudes from the shell body in a direction away from the interior of the shell.

[0018] In the above technical solution, a second convex portion is provided on the outer surface of the shell. When the battery is grouped, the second convex portion on the shell can be used to limit the battery cell by using a concave-convex matching structure with the battery box or other peripheral components of the battery cell, which is beneficial to improve the positioning stability of the battery cell.

[0019] According to some embodiments of the present application, the second protrusion includes a second top wall and a second side wall, the second side wall is arranged around the second top wall, the second side wall connects the second top wall and the shell body, and the second top wall and the second side wall form a second concave cavity connected to the accommodating space.

[0020] In the above technical solution, a second concave cavity is formed at a position corresponding to the second convex portion on the inner surface of the shell facing the electrode assembly, which is beneficial to expanding the internal space of the battery cell and increasing the effective volume of the battery cell without increasing the overall battery size, which is beneficial to improving the energy density of the battery cell.

[0021] According to some embodiments of the present application, the electrode terminal is disposed on the first wall.

[0022] In the above technical solution, usually, the electrode terminal will protrude from the mounting surface, and the electrode terminal and the second protrusion are arranged on the same wall of the shell, which is conducive to making full use of the external space of the battery cell without increasing the peripheral size of the battery cell as much as possible, improving space utilization, and thus improving the energy density of the battery using the battery cell.

[0023] According to some embodiments of the present application, a height of the second protrusion protruding from the first wall is less than or equal to a height of the electrode terminal protruding from the first wall.

[0024] In the above technical solution, the height of the second protrusion protruding from the outer surface of the shell is less than the height of the electrode terminal protruding from the outer surface of the shell, which can reduce the risk of the second protrusion interfering with the electrode terminal, and reduce the risk of the second protrusion overlapping the busbar component electrically connected to the electrode terminal, thereby reducing the risk of short circuit caused by overlapping the busbar component of the shell, and improving the performance reliability of the battery cell.

[0025] According to some embodiments of the present application, there are two electrode terminals, the two electrode terminals are spaced apart on the first wall, and the second protrusion is located between the two electrode terminals.

[0026] In the above technical solution, the second protrusion is arranged between the two electrode terminals. The second protrusion fully utilizes the space between the two electrode terminals, further improving the rationality of space utilization.

[0027] According to some embodiments of the present application, the shell includes a first wall, the electrode terminal is arranged on the first wall, and the first wall is arranged opposite to the end cover.

[0028] In the above technical solution, the electrode terminals and the pressure relief portion are arranged on opposite sides of the battery cell, and the pressure relief direction of the pressure relief portion is away from the electrode terminals, which further reduces the risk of the conductive emissions discharged through the pressure relief portion conducting to the electrode terminals and causing short circuit of the electrode terminals when the battery cell is thermally runaway, thereby improving the performance reliability of the battery cell.

[0029] According to some embodiments of the present application, the shell includes a second wall and a third wall arranged opposite to each other, and two electrode terminals are provided, one of which is arranged on the second wall and the other is arranged on the third wall.

[0030] In the above technical solution, the two electrode terminals of the battery cell are arranged on different surfaces, which is beneficial to improving the structural flexibility and structural diversity of the battery cell.

[0031] In a second aspect, the present application provides a battery comprising a battery cell as described in any one of the above items.

[0032] According to some embodiments of the present application, the battery further includes: a support member disposed on a side of the end cover facing away from the shell, and the support member is configured to support the battery cell.

[0033] In the above technical solution, the battery is provided with a support member, and the support member carries and installs the battery cell, which is beneficial to improving the structural stability of the overall battery structure.

[0034] According to some embodiments of the present application, a plurality of battery cells are provided, and the plurality of battery cells are arranged along a first direction. The support member is located on one side of the battery cell along a second direction, and the first direction is perpendicular to the second direction.

[0035] In the above technical solution, the battery is provided with a plurality of battery cells, and the plurality of battery cells are arranged on the support member, which is beneficial to improving the structural integrity and energy density of the battery.

[0036] According to some embodiments of the present application, the support member is provided with a second groove, which is interconnected with the pressure relief port formed after the pressure relief portion is opened, and the second groove is configured to guide the discharge discharged from the pressure relief port to discharge out of the battery.

[0037] In the above technical solution, the support member is arranged on the side of the battery cell where the pressure relief portion is provided, and a second groove is provided on the support member, which is connected to the pressure relief port of the pressure relief portion. The second groove can accommodate and guide the discharged material discharged through the pressure relief portion, so that the discharged material can be discharged normally through the pressure relief portion, thereby improving the pressure relief smoothness and pressure relief directionality of the pressure relief portion, and thereby improving the performance reliability of the battery.

[0038] According to some embodiments of the present application, the second groove is arranged on a side of the support member facing away from the battery cell, and the support member is provided with a through hole, which connects the pressure relief port and the second groove.

[0039] In the above technical solution, the second groove is arranged on the side of the support member away from the battery cell, so that the support member can timely isolate the discharged material and the battery cell, and the discharged material discharged through the pressure relief portion can be discharged from the battery away from the battery cell, thereby reducing the risk of damaging the battery cell due to contact between the discharged material and the battery cell, thereby improving the performance reliability of the battery.

[0040] According to some embodiments of the present application, the end cover includes a cover body and a first protrusion, the cover body is arranged around the first protrusion, the first protrusion protrudes from the cover body in a direction away from the interior of the shell, the first protrusion includes a first top wall and a first side wall, the first side wall is arranged around the first top wall, the first side wall connects the first top wall and the cover body, and the pressure relief part is arranged on the first top wall; wherein, at least a portion of the first side wall is inserted into the through hole.

[0041] In the above technical solution, the pressure relief portion is arranged on the first convex portion on the end cover and is located on the first top wall of the end of the first convex portion away from the end cover. At the same time, at least a portion of the first side wall of the first convex portion is inserted into the through hole on the support member. On the one hand, the insertion of the first side wall into the through hole of the support member can play a certain limiting role on the battery cell, thereby improving the stability of the relative position of the battery cell and the support member; on the other hand, the first convex portion plays a certain guiding role in the pressure relief of the pressure relief portion, and can guide the discharged material discharged from the pressure relief port to the second groove more fully, stably and quickly, thereby reducing the risk of the discharged material being retained on the side of the support member facing the battery cell, and further improving the reliability of the battery; on the other hand, the insertion of the first convex portion into the through hole can play a certain role in blocking the through hole, at least reducing the gap between the first convex portion and the through hole, thereby reducing the risk of the discharged material discharged into the second groove flowing back through the through hole, which is also beneficial to improving the reliability of the battery.

[0042] According to some embodiments of the present application, the first top wall protrudes from the bottom wall of the second groove.

[0043] In the above technical solution, the first top wall protrudes from the bottom wall of the second groove, and the pressure relief portion is arranged on the first top wall, so that the pressure relief port of the pressure relief portion can be directly connected to the second groove, further improving the stability of the battery cell limit while improving the adequacy of the guided discharge of the discharged material, which is conducive to further improving the reliability of the battery.

[0044] According to some embodiments of the present application, the height of the first top wall protruding from the bottom wall of the second groove is less than the depth of the second groove.

[0045] In the above technical solution, the height of the first top wall protruding from the bottom wall of the second groove is less than the depth of the second groove, allowing the pressure relief portion to be accommodated within the second groove. On the one hand, this prevents other structures outside the second groove from blocking the pressure relief portion or blocking the pressure relief opening of the pressure relief portion, thereby affecting the normal pressure relief of the pressure relief portion. On the other hand, the second groove can provide a certain degree of protection for the pressure relief portion, reducing the risk of wear or damage to the pressure relief portion due to the external environment. The overall structure is conducive to improving the performance and reliability of the battery during use.

[0046] According to some embodiments of the present application, the battery cell and the through hole are both provided in plurality, and the through holes and the pressure relief portions of the battery cells are provided in a one-to-one correspondence.

[0047] In the above technical solution, the pressure relief portions and the through holes are arranged in a one-to-one correspondence, which is beneficial to improving the smoothness of the pressure relief of all battery cells of the battery, and improving the flow conduction performance of the second groove, reducing the risk of a through hole opening being too large due to multiple pressure relief portions corresponding to one through hole, thereby causing a large amount of discharged material to flow back, thereby improving the reliability of the battery.

[0048] According to some embodiments of the present application, the plurality of battery cells are arranged along a first direction, the second groove extends along the first direction, and at least one end of the second groove extends to an edge of the support member.

[0049] In the above technical solution, the second groove extends along the arrangement direction of the battery cells to the edge of the support member. On the one hand, one second groove can discharge the discharged materials corresponding to multiple battery cells, which is beneficial to reducing the number of second grooves set on the support member. On the other hand, the second groove extends to the edge of the support member, which facilitates the timely discharge of the discharged materials in the second groove from the battery, which is beneficial to improving the pressure relief of the battery cells, thereby improving the reliability of the battery.

[0050] According to some embodiments of the present application, a heat exchange cavity for accommodating a heat exchange medium is provided in the support member.

[0051] In the above technical solution, a heat exchange cavity containing a heat exchange medium is provided within the support member. While supporting the battery cells, the support member can regulate the temperature of the battery cells, also contributing to improved battery performance and reliability. Furthermore, the support member is positioned on the side of the battery cell where the pressure relief portion is located. The support member contains a cooling medium, which can promptly cool the discharged material through the pressure relief portion, thereby improving the pressure relief safety of the battery and, consequently, its performance and reliability.

[0052] According to some embodiments of the present application, the support member is a flat plate structure, and the thickness direction of the support member is parallel to the thickness direction of the end cover.

[0053] In the above technical solution, the support member is a flat plate structure, which is beneficial to reducing the space occupied by the support member. The flat plate structure support member can provide a larger bearing surface, which can increase the bearing capacity of the battery cell and is overall beneficial to improving the energy density of the battery.

[0054] According to some embodiments of the present application, the battery further includes: a box body, in which the battery cells and the support member are housed.

[0055] In the above technical solution, the battery includes a box body, which serves to store and protect the battery cells and support members, thereby improving the structural integrity of the battery and the performance reliability of the battery.

[0056] In a third aspect, the present application provides an electrical device, comprising a battery cell as described in any one of the above items, wherein the battery cell is used to provide electrical energy; or comprising a battery as described in any one of the above items, wherein the battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0058] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0059] FIG2 is an exploded view of a battery provided in some embodiments of the present application;

[0060] FIG3 is an exploded view of a battery cell provided in some embodiments of the present application;

[0061] FIG4 is a schematic structural diagram of the end cover of the battery cell shown in FIG3 ;

[0062] FIG5 is an exploded view of a battery cell provided in some embodiments of the present application in other embodiments;

[0063] FIG6 is a front cross-sectional view of the battery cell shown in FIG5 in some embodiments;

[0064] FIG7 is a schematic structural diagram of an end cover of the battery cell shown in FIG5 in some embodiments;

[0065] FIG8 is a schematic structural diagram of the end cover of the battery cell shown in FIG5 in other embodiments;

[0066] FIG9 is a front cross-sectional view of the battery cell shown in FIG5 in some other embodiments;

[0067] FIG10 is an exploded view of batteries provided in some other embodiments of the present application;

[0068] FIG11 is a schematic structural diagram of a support member provided in some other embodiments of the present application;

[0069] FIG12 is a front cross-sectional view of a support member and a battery cell in a separated state provided by some other embodiments of the present application;

[0070] FIG13 is a front cross-sectional view of a first protrusion of a battery cell partially inserted into a through hole of a support member according to yet other embodiments of the present application;

[0071] FIG14 is a front cross-sectional view of a battery cell provided in some other embodiments of the present application, in which the first protrusion protrudes from the bottom wall of the second groove.

[0072] In the drawings, the drawings are not drawn to scale.

[0073] Marking instructions: 1000-vehicle; 100-battery; 10-box; 11-first part; 12-second part; 20-battery cell; 21-end cover; 211-cover body; 212-first protrusion; 2121-first top wall; 2122-first side wall; 213-first cavity; 214-first groove; 22-housing; 221-first wall; 222-second protrusion; 2221-second top wall; 2222-first side wall Two side walls; 223-second concave cavity; 224-accommodation space; 225-opening; 226-second wall; 227-third wall; 23-electrode assembly; 24-electrode terminal; 25-pressure relief portion; 251-notch; 30-support member; 31-second groove; 32-through hole; 33-heat exchange cavity; 200-controller; 300-motor; H1-the height of the first top wall protruding from the bottom wall of the second groove; H2-the depth of the second groove. DETAILED DESCRIPTION

[0074] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0075] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to be closed-ended, non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0076] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0077] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0078] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0079] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0080] The term "plurality" used in this application refers to two or more (including two).

[0081] In the present application, the battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-ion batteries, magnesium-ion batteries, etc., which are not limited in the embodiments of the present application.

[0082] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. The battery may also include a casing for enclosing one or more battery cells or multiple battery modules. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0083] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The portion of the positive electrode collector not coated with the positive active material layer serves as the positive tab, allowing power to be input or output from the positive electrode sheet through the positive tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The portion of the negative electrode collector not coated with the negative active material layer serves as the negative tab, allowing power to be input or output from the negative electrode sheet through the negative tab. The negative electrode current collector can be made of copper, and the negative active material can be carbon or silicon, among others. In order to ensure that large currents can pass without melting, there are multiple positive electrode tabs and they are stacked together, and there are multiple negative electrode tabs and they are stacked together.

[0084] The material of the isolation film may be polypropylene (PP) or polyethylene (PE), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, but the present invention is not limited thereto.

[0085] With the continuous development of battery technology, how to improve battery reliability is a technical problem that needs to be solved urgently.

[0086] For general battery cells, the battery cell is usually assembled into an electrode assembly (bare cell) by winding or laminating the positive electrode sheet, the negative electrode sheet, and the separator. The electrode assembly is then placed in a casing, covered with end caps, and finally injected with electrolyte. The end caps of the battery cell usually cover the opening of the casing. To facilitate the assembly of the battery cell, the end caps of the battery cell are usually provided with electrode terminals and pressure relief parts. The electrode terminals can be directly or indirectly connected to the tabs of the electrode assembly to achieve electrical connection between the electrode terminals and the electrode assembly. The electrode terminals serve as the output poles of the battery cell to realize the input or output of electrical energy of the battery cell. The pressure relief part is used to release the pressure in the casing.

[0087] However, the inventors of the present application have discovered that the conductive material in the discharge material discharged through the pressure relief portion can easily conduct electricity to the electrode terminals and cause a short circuit. In addition, the high-temperature and high-pressure discharge material can easily affect the structural stability of the electrode terminals and the busbar components electrically connected to the electrode terminals, thereby affecting the performance reliability of the battery cells.

[0088] At the same time, the inventors discovered through experiments that placing the pressure relief portion on the housing so that it is not aligned with the electrode terminals can reduce the impact of the pressure relief portion on the structure and performance of the electrode terminals. However, the problem of low battery cell performance reliability still exists. The inventors conducted an in-depth analysis of the reasons for this and found that the housing is a hollow structure. Due to its structural limitations, it is difficult to machine complex structures on the housing. In other words, the design of the pressure relief portion is very limited, making it impossible to machine complex structures on the housing. In addition, the housing is thinner than the end cap. Placing the pressure relief portion in a relatively weak position would greatly reduce the reliability of the battery cell. Moreover, it is impossible to improve the machining accuracy of the pressure relief portion, which also affects the reliability of the battery cell.

[0089] Based on the above reasons, in order to further effectively improve the reliability of the battery, the inventors of the present application designed a battery cell, in which the electrode terminals of the battery cell are arranged in the shell, and the pressure relief part is arranged in the end cover, and the pressure relief part is used to release the internal pressure of the shell.

[0090] The electrode terminals and the pressure relief portion of the battery cell are arranged on different surfaces. Compared with the structure in which the electrode terminals and the pressure relief portion are arranged on the same surface, this can reduce the risk of the conductive emissions discharged through the pressure relief portion conducting to the electrode terminals and causing a short circuit in the event of thermal runaway of the battery cell, thereby improving the performance stability of the battery cell.

[0091] At the same time, the pressure relief part is provided on a separate, planar end cap. The difficulty of directly processing the pressure relief part on the end cap is much less than the difficulty of processing the pressure relief part on the wall of the shell. The processing accuracy of the pressure relief part is relatively high. Providing the pressure relief part on the end cap that is easier to process is conducive to the design of a pressure relief part with a complex structure and can improve the processing accuracy of the pressure relief part. In addition, the shell is formed by stamping, and each surface is limited by the stamping process. The wall thickness of each surface is not much different. In order to avoid material waste and take into account the energy density of the battery cell, the wall of the shell is thin, which is not conducive to improving the processing accuracy of the pressure relief part. As a separate component, the end cap can be adjusted in thickness according to the design requirements of the pressure relief part, which is also conducive to improving the processing accuracy of the pressure relief part and improving the overall structure and performance reliability of the pressure relief part. By improving the reliability of the pressure relief part, the performance reliability of the battery cell is further improved.

[0092] The battery cells disclosed in the embodiments of the present application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device.

[0093] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0094] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle 1000 as an example.

[0095] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0096] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0097] Please refer to Figure 2, which is an exploded view of a battery provided in some embodiments of the present application. Battery 100 may include a housing 10 and battery cells 20, with battery cells 20 being housed within housing 10. Housing 10 provides assembly space for battery cells 20 and may have various structures. In some embodiments, housing 10 may include a first portion 11 and a second portion 12, which overlap each other and together define an assembly space for accommodating battery cells 20. First portion 11 may be a hollow structure with one end open, and second portion 12 may be a plate-like structure, overlapping the open side of first portion 11 to define the assembly space. Alternatively, first portion 11 and second portion 12 may both be hollow structures with one end open, with the open side of first portion 11 overlapping the open side of second portion 12. Housing 10 formed by first portion 11 and second portion 12 may have various shapes, such as a cylinder or a rectangular parallelepiped.

[0098] In the battery 100, there may be multiple battery cells 20, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the battery cells 20. The battery cells 20 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid configuration to form a battery module, which may then be connected in series, in parallel, or in a hybrid configuration to form a single unit housed within the housing 10.

[0099] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0100] Please refer to Figure 3, which is an exploded view of a battery cell provided in some embodiments of the present application. Some embodiments of the present application provide a battery cell 20, which includes a housing 22, an end cap 21, an electrode assembly 23, an electrode terminal 24, and a pressure relief portion 25. The housing 22 has a housing space 224 and an opening 225 communicating with the housing space 224. The electrode assembly 23 is accommodated in the housing space 224. The end cap 21 closes the opening 225. The electrode terminal 24 is disposed in the housing 22 and is electrically connected to the electrode assembly 23. The pressure relief portion 25 is disposed on the end cap 21 and is used to release pressure within the housing 22.

[0101] The electrode assembly 23 is the component within the battery cell 20 where the electrochemical reaction occurs. The main body of the electrode assembly 23 may include a positive electrode sheet, a negative electrode sheet, and a separator. The main body of the electrode assembly 23 may be a wound structure formed by winding the positive electrode sheet, separator, and negative electrode sheet, or a stacked structure formed by stacking the positive electrode sheet, separator, and negative electrode sheet. The electrode assembly 23 may also include positive and negative electrode tabs extending from the main body.

[0102] The housing 22 provides a housing space 224 for components such as the electrode assembly 23 and the electrolyte. The end cap 21 can be a flat plate or a flat structure. The housing 22 and the end cap 21 together form a closed cavity for placing components such as the electrode assembly 23 and the electrolyte.

[0103] The electrode terminals 24 are disposed on the housing 22 and connected to the electrode assembly 23 within the housing 22. Each battery cell 20 may be provided with two electrode terminals 24, which serve as a positive terminal and a negative terminal, respectively. The positive terminal is connected to the positive tab of the electrode assembly 23, and the negative terminal is connected to the negative tab of the electrode assembly 23. Depending on the structure of the housing 22, the electrode terminals 24 may be disposed on the same wall of the housing 22 or on different walls of the housing 22.

[0104] The pressure relief portion 25 refers to an element, component, or structure that is activated to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a certain value. The pressure relief portion 25 can be a structure such as an explosion-proof valve, an air valve, a pressure relief valve, or a safety valve installed on the end cover 21. Of course, the pressure relief portion 25 can also be a structure with a locally thinned thickness provided on the end cover 21, so that the pressure relief portion 25 forms a weak area in the thinned area. When the battery cell 20 experiences thermal runaway, the pressure relief portion 25 can tear, crack, or break in the thinned area to form a pressure relief port for releasing the internal pressure or temperature. The high-temperature and high-pressure substances inside the battery cell 20 will be discharged from the pressure relief port to the outside of the battery cell 20 as a discharge material, causing the battery cell 20 to release pressure and temperature, thereby improving the performance reliability of the battery cell 20.

[0105] The leaked materials include but are not limited to: electrolyte, dissolved or split positive and negative electrodes, fragments of separator, high-temperature and high-pressure gas generated by the reaction, flame, etc.

[0106] The electrode terminals 24 and pressure relief portion 25 of the battery cell 20 are arranged on different surfaces. Compared to structures where the electrode terminals 24 and pressure relief portion 25 are arranged on the same surface, this reduces the risk of conductive emissions from the pressure relief portion 25 conducting to the electrode terminals 24 and causing a short circuit in the event of thermal runaway of the battery cell 20, thereby improving the performance stability of the battery cell 20. Furthermore, the end cap 21 is more planar than the housing 22 and is thicker. The pressure relief portion 25 is located on the end cap 21, reducing the risk of design limitations due to thickness restrictions at the location of the pressure relief portion 25 and improving its design flexibility and machining accuracy. The planar end cap 21 also facilitates the machining of the pressure relief portion 25, improving its ease and precision. By enhancing the reliability of the pressure relief portion 25, the overall battery cell 20 achieves improved performance reliability.

[0107] In some embodiments, please continue to refer to Figure 3 and further refer to Figure 4. Figure 4 is a structural schematic diagram of the end cover of the battery cell shown in Figure 3. A first groove 214 is provided on the side of the end cover 21 facing away from the electrode assembly 23, and the pressure relief portion 25 is provided on the bottom wall of the first groove 214.

[0108] Specifically, a first groove 214 is provided on the side of the end cover 21 facing away from the electrode assembly 23. Along the thickness direction of the end cover 21 (the Z direction shown in Figures 3 and 4), the first groove 214 is recessed toward the electrode assembly 23, and the pressure relief portion 25 is arranged on the bottom wall of the first groove 214.

[0109] As mentioned above, there are various implementation structures of the pressure relief portion 25. For example, the pressure relief portion 25 arranged on the bottom wall of the groove can form a local thinning area (such as the notch 251 shown in Figure 4. The pressure relief portion 25 forms a weak area in the area where the notch 251 is provided. When the battery cell 20 has thermal runaway, the pressure relief portion 25 can crack along the notch 251 to release the internal pressure of the battery cell 20). Of course, the shape structure of the local thinning area is not limited to the notch 251.

[0110] It should be noted that the pressure relief portion 25 and the end cover 21 can be an integral structure or a split structure. If the pressure relief portion 25 and the end cover 21 are an integral structure, the end cover 21 can be made by a process such as stamping or extrusion molding, and a thinning area can be directly processed on the bottom wall of the first groove 214 on the end cover 21; if the pressure relief portion 25 and the end cover 21 are a split structure, a mounting hole can be first provided on the end cover 21, which passes through the first groove 214 along the thickness direction of the end cover 21, and then the pressure relief portion 25 can be installed on the bottom wall of the first groove 214 and the mounting hole can be sealed.

[0111] A first groove 214 recessed toward the interior of the battery cell 20 is provided on the side of the end cover 21 facing away from the electrode assembly 23, and the pressure relief portion 25 is provided on the bottom wall of the first groove 214. The pressure relief portion 25 is provided in the concave area of ​​the end cover 21, which can play a certain protective role for the pressure relief portion 25, reduce the risk of the pressure relief portion 25 being worn or damaged by the external environment, and thereby reduce the risk of the pressure relief portion 25 opening prematurely, and reduce the risk of the pressure relief pressure required by the pressure relief portion 25 increasing due to the pressure relief portion 25 being blocked by other components, thereby improving the functional stability of the pressure relief portion 25, and thereby helping to improve the performance reliability of the battery cell 20 during use.

[0112] In other embodiments, please refer to Figures 5 and 6. Figure 5 is an exploded view of a battery cell provided in some embodiments of the present application, and Figure 6 is a front cross-sectional view of the battery cell shown in Figure 5 in some embodiments. The end cap 21 includes a cap body 211 and a first protrusion 212. The cap body 211 is arranged around the first protrusion 212, and the first protrusion 212 protrudes from the cap body 211 in a direction away from the interior of the housing.

[0113] That is, the end cover 21 includes a cover body 211 for covering the opening 225 of the shell 22 and a first protrusion 212 protruding from the cover body 211, the cover body 211 has an outer surface facing away from the electrode assembly 23, and the first protrusion 212 protrudes from the cover body 211 along the direction away from the interior of the shell (the Z direction shown in Figures 5 and 6).

[0114] The shape of the first protrusion 212 can be any conventional or unconventional shape, such as a cylinder, a prism, or a cone, and the embodiments of the present application are not limited to this. For example, as shown in Figure 5, the first protrusion 212 is a square cone structure, and the cross-section of the first protrusion 212 gradually decreases along the direction from the electrode assembly 23 to the cover body 211. The first protrusion 212 of this shape can guide the group installation of the battery cells 20, reduce the initial installation position accuracy requirements of the battery cells 20, and improve the convenience of grouping.

[0115] It is understandable that the first protrusion 212 and the cover body 211 can be integrally formed, or can be provided separately and connected to each other by welding, bonding, screwing, etc. Exemplarily, the first protrusion 212 and the cover body 211 are integrally formed.

[0116] A first protrusion 212 is provided on the side of the end cover 21 facing away from the electrode assembly 23. When the batteries 100 are grouped, the first protrusion 212 on the end cover 21 can be used to limit the battery cell 20 by using a concave-convex matching structure with the battery box 10 of the battery 100 or the supporting parts of other battery cells 20, which is beneficial to improve the positioning stability of the battery cell 20.

[0117] In some embodiments, as shown in Figure 6, the first protrusion 212 includes a first top wall 2121 and a first side wall 2122, the first side wall 2122 is arranged around the first top wall 2121, the first side wall 2122 connects the first top wall 2121 and the cover body 211, and the first top wall 2121 and the first side wall 2122 form a first concave cavity 213 that is connected to the accommodating space 224.

[0118] Specifically, the cover body 211 and the first top wall 2121 are spaced apart, the first side wall 2122 is arranged around the first top wall 2121 and connects the first top wall 2121 and the cover body 211, and the first top wall 2121 and the first side wall 2122 form a first concave cavity 213 that is open toward one end of the cover body 211, so that the first concave cavity 213 is connected to the accommodating space 224.

[0119] It is understood that the shape of the first top wall 2121 can be any conventional shape such as circular, rectangular, or any special shape. For example, the first top wall 2121 is rectangular.

[0120] The first sidewall 2122 can extend toward the cover body 211 in any direction intersecting the plane of the first top wall 2121. For example, the cross-section of the first cavity 213 gradually increases along the direction from the first top wall 2121 toward the cover body 211. That is, the first sidewall 2122 gradually extends outward from the first top wall 2121.

[0121] The first cavity 213 expands the internal space of the battery cell 20 , that is, expands the accommodating space 224 , thereby increasing the effective volume of the battery cell 20 without increasing the external dimensions of the entire battery 100 , which is beneficial to improving the energy density of the battery cell 20 .

[0122] In some embodiments, please continue to refer to FIG. 5 and FIG. 6 , and further refer to FIG. 7 , which is a schematic structural diagram of the end cover of the battery cell shown in FIG. 5 in some embodiments, where the pressure relief portion 25 is disposed on the first top wall 2121 .

[0123] The first top wall 2121 and the first side wall 2122 form a first concave cavity 213, which is connected to the accommodating space 224. The pressure relief portion 25 is provided on the first top wall 2121. The first concave cavity 213 can play a certain convergence role. When the battery cell 20 experiences thermal runaway, the first concave cavity 213 can provide a buffer zone for the discharged material, which is conducive to the smooth discharge of the discharged material, thereby helping to improve the performance reliability of the battery cell 20.

[0124] Of course, in some other embodiments, the pressure relief portion 25 can also be set at any position of the first side wall 2122, and the position of the first pressure relief portion 25 can be flexibly set according to factors such as the shape of the first convex portion 212 and the pressure relief direction requirements.

[0125] In some embodiments, please refer to Figure 7 and further refer to Figure 8, which is a structural schematic diagram of the end cover of the battery cell shown in Figure 5 in other embodiments. A first groove 214 is provided on the side of the first top wall 2121 facing away from the interior of the shell, and the pressure relief portion 25 is provided on the bottom wall of the first groove 214.

[0126] That is, the pressure relief portion 25 may be disposed at an end of the first protrusion 212 away from the cover body 211 and sunken relative to the first top wall 2121 .

[0127] As mentioned above, the pressure relief portion 25 arranged on the bottom wall of the first groove 214 can form a local thinning area (such as the notch 251, the pressure relief portion 25 forms a weak area in the area where the notch 251 is provided. When the battery cell 20 has thermal runaway, the pressure relief portion 25 can crack along the notch 251 to release the internal pressure of the battery cell 20). Of course, the shape structure of the local thinning area is not limited to the notch 251.

[0128] For example, a notch 251 is formed on the pressure relief portion 25 disposed on the bottom wall of the first groove 214. The shape of the notch 251 is not limited in this embodiment. As shown in FIG8 , the notch 251 can be a linear notch 251.

[0129] The pressure relief portion 25 is arranged in the concave area of ​​the first convex portion 212, which can play a certain protective role for the pressure relief portion 25, reduce the risk of the pressure relief portion 25 being worn or damaged by the external environment, and thus reduce the risk of the pressure relief portion 25 opening prematurely, and reduce the risk of the pressure relief pressure required by the pressure relief portion 25 increasing due to the pressure relief portion 25 being blocked by other components, thereby improving the functional stability of the pressure relief portion 25, and thus helping to improve the performance reliability of the battery cell 20 during use.

[0130] 5 and 6 , the housing 22 includes a first wall 221 and a second protrusion 222 . The first wall 221 is disposed around the second protrusion 222 . The second protrusion 222 protrudes from the first wall 221 away from the interior of the housing.

[0131] That is, the housing 22 includes a first wall 221 , a second protrusion 222 is formed on a side of the first wall 221 facing away from the electrode assembly 23 , and the second protrusion 222 protrudes from an outer surface of the first wall 221 .

[0132] It can be understood that the shell 22 can be a structure of any shape with an accommodating space 224 and an opening 225, and the first wall 221 can be any wall part of the shell 22. For example, the shell 22 can include a bottom wall and side walls surrounding the bottom wall, and the bottom wall is arranged opposite to the end cover 21. The first wall 221 can be the bottom wall of the shell 22 or the side wall of the shell 22.

[0133] Similar to the first protrusion 212, the second protrusion 222 can be shaped in any conventional or unconventional manner, such as a cylinder, a prism, or a pyramidal cone, and the present embodiment is not limited thereto. For example, the second protrusion 222 can have the same square cone structure as the first protrusion 212, with the cross-section of the second protrusion 222 gradually decreasing along the inner surface of the first wall 221 toward the outer surface of the first wall 221. This shape of the second protrusion 222 can guide the grouping of battery cells 20, reduce the initial installation position accuracy requirements of the battery cells 20, and improve the convenience of grouping.

[0134] It is understandable that the second protrusion 222 and the housing 22 can be integrally formed, or can be provided separately and connected to each other by welding, bonding, screwing, etc. Exemplarily, the second protrusion 222 and the housing 22 are integrally formed.

[0135] Based on the implementation form of "the end cover 21 includes a cover body 211 and a first protrusion 212", a first protrusion 212 is provided on the cover body 211, and a second protrusion 222 is provided on the shell 22. The first protrusion 212 and the second protrusion 222 are located at different positions of the battery cell 20, and multi-point limiting can be implemented on the battery cell 20.

[0136] A second protrusion 222 is provided on the outer surface of the shell 22. When the battery 100 is grouped, the second protrusion 222 on the shell 22 can be used to limit the battery cell 20 by using a concave-convex matching structure with the battery box 10 of other battery cells 20, which is beneficial to improve the positioning stability of the battery cell 20.

[0137] In some embodiments, as shown in Figure 6, the second protrusion 222 includes a second top wall 2221 and a second side wall 2222, the second side wall 2222 is arranged around the second top wall 2221, the second side wall 2222 connects the second top wall 2221 and the first wall 221, and the second top wall 2221 and the second side wall 2222 form a second concave cavity 223 that is connected to the accommodating space 224.

[0138] Specifically, the first wall 221 and the second top wall 2221 are spaced apart, the second side wall 2222 is arranged around the second top wall 2221 and connects the second top wall 2221 and the first wall 221, and the second top wall 2221 and the second side wall 2222 form a second concave cavity 223 that is open toward one end of the first wall 221, so that the second concave cavity 223 is connected to the accommodating space 224.

[0139] It is understandable that the shape of the second top wall 2221 can be any conventional shape such as circular, rectangular, or any special shape. For example, the second top wall 2221 is rectangular.

[0140] The second sidewall 2222 can extend toward the first wall 221 along any direction intersecting the plane of the second top wall 2221. For example, the cross-section of the second cavity 223 gradually increases along the direction from the second top wall 2221 toward the first wall 221. That is, the second sidewall 2222 gradually extends outward from the second top wall 2221.

[0141] The second cavity 223 also expands the internal space of the battery cell 20 , that is, expands the accommodating space 224 , thereby increasing the effective volume of the battery cell 20 without increasing the external dimensions of the entire battery 100 , which is beneficial to improving the energy density of the battery cell 20 .

[0142] In some embodiments, as shown in FIG. 6 , the electrode terminal 24 is disposed on the first wall 221 .

[0143] That is, the electrode terminal 24 and the second protrusion 222 can be arranged on the same wall portion (first wall 221 ) of the shell 22 , and the electrode terminal 24 and the second protrusion 222 can be arranged on the first wall 221 along any direction perpendicular to the thickness direction of the first wall 221 .

[0144] As previously mentioned, the battery cell 20 may be provided with two electrode terminals 24, the two electrode terminals 24 being a positive terminal and a negative terminal, respectively. The second protrusion 222 and the two electrode terminals 24 may be arranged in a linear manner. For example, the second protrusion 222 may be located on one side of the two electrode terminals 24 or between the two electrode terminals 24. Of course, the second protrusion 222 and the two electrode terminals 24 may also be distributed in a scattered manner on the first wall 221.

[0145] In some embodiments, as shown in FIG. 6 , two electrode terminals 24 are provided. The two electrode terminals 24 are spaced apart on the first wall 221 , and the second protrusion 222 is located between the two electrode terminals 24 .

[0146] Furthermore, the two electrode terminals 24 can be arranged in any direction parallel to the plane where the first wall 221 is located. For example, as shown in FIG. 6 , the two electrode terminals 24 can be spaced apart along the length direction (Y direction) of the first wall 221 .

[0147] The second protrusion 222 is disposed between the two electrode terminals 24 . The second protrusion 222 fully utilizes the space between the two electrode terminals 24 , further improving the rationality of space utilization.

[0148] Typically, the electrode terminal 24 will protrude from the mounting surface, and the electrode terminal 24 and the second protrusion are arranged on the same wall of the shell 22, which is beneficial for making full use of the external space of the battery cell 20 without increasing the peripheral size of the battery cell 20 as much as possible, improving space utilization, and thus improving the energy density of the battery 100 using the battery cell 20.

[0149] It is understandable that the height of the electrode terminal 24 protruding from the first wall 221 may be the same as or different from the height of the second protrusion 222 protruding from the first wall 221 .

[0150] In some embodiments, the height of the second protrusion 222 protruding from the first wall 221 is less than or equal to the height of the electrode terminal 24 protruding from the first wall 221 .

[0151] Specifically, the height of the second protrusion 222 protruding from the first wall 221 can be less than the height of the electrode terminal 24 protruding from the first wall 221, or can be equal to the height of the electrode terminal 24 protruding from the first wall 221. In other words, the second protrusion 222 does not extend beyond the electrode terminal 24 in a direction perpendicular to the plane of the first wall 221 (the Z direction shown in FIG. 6 ).

[0152] The height of the second protrusion 222 protruding from the outer surface of the shell 22 is less than the height of the electrode terminal 24 protruding from the outer surface of the shell 22, which can reduce the risk of the second protrusion 222 interfering with the electrode terminal 24 and reduce the risk of the second protrusion 222 overlapping the busbar component electrically connected to the electrode terminal 24, thereby reducing the risk of short circuit caused by overlapping of the busbar components of the shell 22, and improving the performance reliability of the battery cell 20.

[0153] In some embodiments, referring again to FIG. 3 and FIG. 5 , the housing 22 includes a first wall 221 , the electrode terminal 24 is disposed on the first wall 221 , and the first wall 221 is disposed opposite to the end cap 21 .

[0154] Specifically, the pressure relief portion 25 is provided on the end cover 21 , the electrode terminal 24 is provided on the first wall 221 of the housing 22 opposite to the end cover 21 , and the electrode terminal 24 and the pressure relief portion 25 are provided at opposite ends of the battery cell 20 .

[0155] In some embodiments, the end cap 21 can be configured to support the electrode assembly 23. That is, as shown in Figure 5, the end cap 21 of the battery cell 20 can be set toward the ground or downward or toward the bottom of the box body 10, so that the end cap 21 can support the electrode assembly 23 in the Z direction, and the end of the battery cell 20 provided with the electrode terminal 24 can be set facing the top of the box body 10 or upward.

[0156] In other embodiments, the first wall 221 of the shell 22 can be configured to support the electrode assembly 23. That is, as shown in Figure 3, the first wall 221 of the shell 22 on which the electrode terminal 24 is provided can be set toward the ground or downward or toward the bottom of the box body 10, so that the first wall 221 can support the electrode assembly 23 in the Z direction, and the end cover 21 of the battery cell 20 can be set facing the top of the box body 10 or upward.

[0157] The electrode terminals 24 and the pressure relief portion 25 are arranged on opposite sides of the battery cell 20. The pressure relief direction of the pressure relief portion 25 is away from the electrode terminals 24, further reducing the risk of the conductive emissions discharged through the pressure relief portion 25 conducting to the electrode terminals 24 and causing a short circuit in the electrode terminals 24 when the battery cell 20 thermally runs away, thereby improving the performance reliability of the battery cell 20.

[0158] In other embodiments, please refer to Figure 9, which is a main cross-sectional view of the battery cell shown in Figure 5 in other embodiments. The shell 22 includes a second wall 226 and a third wall 227 arranged opposite to each other, and two electrode terminals 24 are provided, one of which is arranged on the second wall 226, and the other electrode terminal 24 is arranged on the third wall 227.

[0159] Specifically, two electrode terminals 24 are provided, and the two electrode terminals 24 are respectively disposed on two opposite wall portions of the housing 22 .

[0160] It is understandable that the two electrode terminals 24 can be respectively disposed on any two oppositely disposed walls of the housing 22 .

[0161] For example, referring to FIG. 5 and further to FIG. 9 , the housing 22 may include a bottom wall (first wall 221) and side walls surrounding the bottom wall. The opening 225 of the housing 22 is opposite the bottom wall of the housing 22. The end cap 21 covers the opening 225 of the housing 22 and is disposed opposite the bottom wall of the housing 22. The side walls of the housing 22 include a second wall 226 and a third wall 227 disposed opposite each other along the Y direction, and two fourth walls disposed opposite each other along the X direction connecting the second wall 226 and the third wall 227. One electrode terminal 24 is disposed on the second wall 226, and the other electrode terminal 24 is disposed on the third wall 227.

[0162] The two electrode terminals 24 of the battery cell 20 are arranged on different surfaces, which is beneficial to improving the structural flexibility and structural diversity of the battery cell 20.

[0163] Still other embodiments of the present application provide a battery 100 , which includes the battery cell 20 described in any one of the above items.

[0164] In some other embodiments, please refer to Figure 10, which is an exploded view of a battery provided in some other embodiments of the present application. The battery 100 also includes a support member 30, which is arranged on the side of the end cover 21 away from the shell 22, and the support member 30 is configured to support the battery cell 20.

[0165] Specifically, the support member 30 is configured to support the battery cell 20. The support member 30 can be set at the bottom of the battery cell 20. The support member 30 can have a supporting surface facing the battery cell 20. The battery cell 20 is provided with an end of the end cover 21 facing the supporting surface of the support member 30.

[0166] The support member 30 may be implemented in various forms. The support member 30 may be a block-shaped, plate-shaped, or other separately provided structure. Of course, in some other embodiments, the support member 30 may be integrated into the box 10 for accommodating the battery cell 20 .

[0167] In some embodiments, as shown in FIG10 , the support member 30 is a flat plate structure, and the thickness direction of the support member 30 (the Z direction shown in FIG10 ) is parallel to the thickness direction of the end cap 21. The plate-shaped support member 30 helps reduce the space occupied by the support member 30, and the flat plate structure of the support member 30 can provide a larger load-bearing surface, thereby increasing the load capacity of the battery cell 20 and overall helping to improve the energy density of the battery 100.

[0168] The support member 30 may be made of metal materials such as copper, iron, steel, and aluminum alloy.

[0169] Based on the implementation form of "the end cover 21 includes a cover body 211 and a first protrusion 212", the bearing surface of the support member 30 can be provided with a recess corresponding to the position of the first protrusion 212. When the batteries 100 are grouped, the first protrusion 212 can be partially or completely inserted into the recess on the support member 30 to assist in limiting the battery cell 20.

[0170] The battery 100 is provided with a support member 30 , which supports and installs the battery cell 20 , thereby improving the structural stability of the overall structure of the battery 100 .

[0171] It is understandable that one support member 30 may only carry one battery cell 20 , or one support member 30 may also carry two, three or even more battery cells 20 .

[0172] In some other embodiments, as shown in Figure 10, a plurality of battery cells 20 are provided, and the plurality of battery cells 20 are arranged along a first direction (the X direction shown in Figure 10), and the support member 30 is located on one side of the battery cell 20 along a second direction (the Z direction shown in Figure 10), and the first direction is perpendicular to the second direction.

[0173] That is, the plurality of battery cells 20 are arranged along a first direction (X direction shown in FIG. 10 ), and the support member 30 is located on one side of the plurality of batteries 100 along a second direction (Z direction shown in FIG. 10 ) to support the plurality of battery cells 20 .

[0174] The battery 100 is provided with a plurality of battery cells 20 , and the plurality of battery cells 20 are arranged on the support member 30 , which is beneficial to improving the structural integrity and energy density of the battery 100 .

[0175] In some other embodiments, please refer to Figure 10 and further refer to Figure 11. Figure 11 is a structural schematic diagram of the support member provided in some other embodiments of the present application. The support member 30 shown in Figure 10 and the support member 30 shown in Figure 11 are reversed top and bottom. The support member 30 is provided with a second groove 31. The second groove 31 is interconnected with the pressure relief port formed after the pressure relief portion 25 is opened. The second groove 31 is configured to guide the discharge discharged from the pressure relief port to discharge out of the battery.

[0176] Specifically, the pressure relief portion 25 is provided on the end cap 21, and the end cap 21 faces the support member 30. Therefore, the pressure relief portion 25 also faces the support member 30. When thermal runaway occurs in the battery cell 20, the discharged material discharged through the pressure relief portion 25 is discharged in a direction close to the support member 30. The support member 30 is provided with a second groove 31 that is interconnected with the pressure relief opening formed when the pressure relief portion 25 is opened. The discharged material discharged through the pressure relief opening can be discharged into the second groove 31 and circulate within the second groove 31. The extension path of the second groove 31 is designed to guide the discharge of the discharged material, allowing the discharged material to flow within the second groove 31 and ultimately discharge from the battery in the direction of the extension of the second groove 31. This ensures smooth pressure relief from the pressure relief portion 25 and prevents interference with the pressure relief of the pressure relief portion 25 by the support member 30.

[0177] By planning the shape and extension direction of the second groove 31 , it is possible to guide the discharge of the discharged matter, improve the pressure relief smoothness and pressure relief directionality of the pressure relief portion 25 , and thereby improve the performance reliability of the battery 100 .

[0178] It is understood that the shape and extension direction of the second groove 31 can be flexibly designed based on the arrangement of the battery cells 20 or the discharge direction requirements of the entire battery 100. The second groove 31 can be a straight groove, a U-shaped groove, a circuitous groove, etc. The end of the second groove 31 can be positioned at a predetermined pressure relief position, so that the discharge flows through the second groove 31 and exits the battery 100 at the end of the second groove 31. The end position of the second groove 31 can be flexibly set based on pressure relief requirements. Furthermore, the number of second grooves 31 can also be flexibly set based on the number of battery cells 20 or their arrangement. For example, only one second groove 31 can be provided, and the second groove 31 can communicate with the pressure relief openings formed by the opened pressure relief portions 25 of all battery cells 20. Alternatively, multiple second grooves 31 can be provided, and each second groove 31 can communicate with the pressure relief openings formed by the opened pressure relief portions 25 of only a portion of the battery cells 20 in the battery 100.

[0179] In addition, the second groove 31 can be directly provided on the surface of the support member 30 facing the end cover 21, with the second groove 31 facing the pressure relief portion 25. Of course, the second groove 31 can also be provided inside the support member 30. In this case, a channel communicating with the inner cavity of the support member 30 can be provided at the position of the support member 30 corresponding to the pressure relief portion 25. The channel connects the pressure relief port formed after the pressure relief portion 25 is opened and the inner cavity of the support member 30.

[0180] In yet other embodiments, please continue to refer to Figures 10 and 11, and further to Figures 12 and 13. Figure 12 is a front cross-sectional view of a support member and battery cell separated in yet other embodiments of the present application; Figure 13 is a front cross-sectional view of a battery cell with the first protrusion partially inserted into the through-hole of the support member in yet other embodiments of the present application. A second groove 31 is provided on the side of the support member 30 facing away from the battery cell 20. The support member 30 is provided with a through-hole 32, which connects the pressure relief port and the second groove 31.

[0181] That is, the second groove 31 is provided on the side of the support member 30 away from the battery cell 20 , and the support member 30 can play a role in isolating the battery cell 20 from the discharged objects.

[0182] Because the pressure relief portion 25 and the second groove 31 are arranged on opposite sides of the support member 30, the support member 30 is provided with a through hole 32 that passes through the support member 30. One end of the through hole 32 is connected to the second groove 31, and the other end faces the pressure relief portion 25. The through hole 32 can connect the pressure relief port formed after the pressure relief portion 25 is opened and the second groove 31.

[0183] It is understandable that the position of the through hole 32 may correspond to the position of the pressure relief portion 25 , so as to shorten the trajectory of the discharged matter entering the second groove 31 as much as possible.

[0184] The second groove 31 is provided on the side of the support member 30 away from the battery cell 20 , so that the support member 30 can timely isolate the discharged material from the battery cell 20 , and the discharged material discharged through the pressure relief portion 25 can be discharged from the battery 100 away from the battery cell 20 , thereby reducing the risk of damaging the battery cell 20 due to contact between the discharged material and the battery cell 20 , thereby improving the performance reliability of the battery 100 .

[0185] The through hole 32 can be flexibly arranged according to the number of battery cells 20. For example, when there is only one battery cell 20, only one through hole 32 can be provided. When there are multiple battery cells 20, one through hole 32 can correspond to only one pressure relief portion 25 of the battery cell 20. Alternatively, one through hole 32 can correspond to the pressure relief portions 25 of two, three, or even more battery cells 20.

[0186] It can be understood that when there are multiple through holes 32 , each through hole 32 is connected to the second groove 31 .

[0187] In some other embodiments, as shown in Figures 12 and 13, the end cover 21 includes a cover body 211 and a first protrusion 212, the cover body 211 is arranged around the first protrusion 212, the first protrusion 212 protrudes from the cover body 211 in a direction away from the interior of the shell, the first protrusion 212 includes a first top wall 2121 and a first side wall 2122, the first side wall 2122 is arranged around the first top wall 2121, the first side wall 2122 connects the first top wall 2121 and the cover body 211, and the pressure relief portion 25 is arranged on the first top wall 2121; at least a portion of the first side wall 2122 is inserted into the through hole 32.

[0188] The implementation of the first protrusion 212 is as described above and will not be repeated here. Specifically, the first top wall 2121 of the first protrusion 212 is spaced apart from the cover body 211 , and the pressure relief portion 25 is disposed on the first top wall 2121 .

[0189] At least a portion of the first side wall 2122 is inserted into the through hole 32. That is, only the end of the first protrusion 212 facing away from the cover body 211 can be inserted into the through hole 32, or the entire first protrusion 212 can be inserted into the through hole 32. Because the pressure relief portion 25 is provided at the end portion (first top wall 2121) of the first protrusion 212, when at least a portion of the first side wall 2122 is inserted into the through hole 32, the pressure relief portion 25 can also be inserted into the through hole 32.

[0190] It is understandable that after the first protrusion 212 is inserted into the through hole 32 , the first protrusion 212 may protrude from the surface of the support member 30 facing away from the battery cell 20 , or may not protrude from the surface of the support member 30 facing away from the battery cell 20 .

[0191] The pressure relief portion 25 is provided on the first protrusion 212 on the end cover 21 and is located at the end of the first protrusion 212 away from the end cover 21. At the same time, at least a portion of the first protrusion 212 is inserted into the through hole 32 on the support member 30. On the one hand, the insertion of the first protrusion 212 into the through hole 32 of the support member 30 can play a certain role in limiting the battery cell 20, thereby improving the stability of the relative position of the battery cell 20 and the support member 30; on the other hand, the first protrusion 212 plays a certain guiding role in the pressure relief of the pressure relief portion 25, thereby being able to discharge the pressure relief outlet. On the other hand, the first protrusion 212 inserted into the through hole 32 can block the through hole 32 to a certain extent, or at least reduce the gap between the first protrusion 212 and the through hole 32, thereby reducing the risk of the discharged matter discharged into the second groove 31 flowing back through the through hole 32, which is also beneficial to improving the reliability of the battery 100.

[0192] In some other embodiments, please refer to FIG12 and further to FIG14, which is a front cross-sectional view of a battery cell provided in some other embodiments of the present application, wherein the first protrusion protrudes from the bottom wall of the second groove. The first top wall 2121 protrudes from the bottom wall of the second groove 31.

[0193] As mentioned above, the through hole 32 is connected to the second groove 31, and the first top wall 2121 protrudes from the bottom wall of the second groove 31. That is, the opening surface of the through hole 32 can be located at the bottom wall of the second groove 31, and one end of the first protrusion 212 inserted into the through hole 32 can pass through the through hole 32 through the opening surface of the through hole 32 and be exposed in the second groove 31.

[0194] It will be appreciated that the pressure relief portion 25 is disposed on the first top wall 2121, and since the first top wall 2121 protrudes from the bottom wall of the second groove 31, the pressure relief portion 25 also protrudes from the bottom wall of the second groove 31. In the event of thermal runaway of the battery cell 20, the pressure relief portion 25 opens to form a pressure relief vent, allowing the discharged material to be discharged directly into the second groove 31. This helps to improve the stability of the battery cell 20's position and enhance the adequacy of the guided discharge of the discharged material, further enhancing the reliability of the battery 100.

[0195] In some other embodiments, as shown in FIG. 14 , a height H1 of the first top wall 2121 protruding from the bottom wall of the second groove 31 is smaller than a depth H2 of the second groove 31 .

[0196] Specifically, along the Z direction in FIG. 14 , the first top wall 2121 does not extend out of the second groove 31 , and a certain gap exists between the first top wall 2121 and the surface of the support member 30 .

[0197] The height H1 of the first top wall 2121 protruding from the bottom wall of the second groove 31 is less than the depth H2 of the second groove 31, allowing the pressure relief portion 25 to be accommodated within the second groove 31. On the one hand, this prevents other structures outside the second groove 31 from blocking the pressure relief portion 25 or blocking the pressure relief opening of the pressure relief portion 25, thereby affecting the normal pressure relief of the pressure relief portion 25. On the other hand, the second groove 31 can provide a certain degree of protection for the pressure relief portion 25, reducing the risk of wear or damage to the pressure relief portion 25 due to the external environment. This overall structure helps improve the performance and reliability of the battery 100 during use.

[0198] In some other embodiments, referring again to FIG. 10 and FIG. 11 , a plurality of battery cells 20 and a plurality of through holes 32 are provided, and the through holes 32 and the pressure relief portions 25 of the battery cells 20 are provided in a one-to-one correspondence.

[0199] As mentioned above, when multiple battery cells 20 are provided, one through hole 32 can correspond to the pressure relief portions 25 of two, three or even more battery cells 20, or one through hole 32 can correspond to only the pressure relief portion 25 of one battery cell 20 (i.e., the through hole 32 and the pressure relief portion 25 of the battery cell 20 are provided in a one-to-one correspondence).

[0200] That is, the number of through holes 32 and battery cells 20 is the same, and multiple through holes 32 are connected to the second groove 31. Each through hole 32 connects the pressure relief port formed by the pressure relief portion 25 of a battery cell 20 being opened and the second groove 31.

[0201] The one-to-one arrangement of the pressure relief portions 25 and the through holes 32 is beneficial for improving the smoothness of pressure relief of all battery cells 20 of the battery 100, and improving the flow conduction performance of the second groove 31, reducing the risk of a large amount of discharged material flowing back due to a through hole 32 corresponding to multiple pressure relief portions 25, thereby improving the reliability of the battery 100.

[0202] It is understood that the multiple battery cells 20 can be arranged in a certain order on the support member 30 , for example, the multiple battery cells 20 can be arranged in a linear, circular, S-shaped, etc. Of course, the multiple battery cells 20 can also be distributed in a scattered manner on the support member 30 .

[0203] In some other embodiments, as shown in FIG. 10 and FIG. 11 , a plurality of battery cells 20 are arranged along the first direction, the second groove 31 extends along the first direction, and at least one end of the second groove 31 extends to the edge of the support member 30 .

[0204] As shown in FIG. 10 , a plurality of battery cells 20 are arranged along a first direction (the X direction shown in FIG. 10 ), and the first direction is parallel to the plane where the supporting surface of the support member 30 is located.

[0205] When multiple battery cells 20 are arranged along the first direction, the pressure relief portions 25 of the multiple battery cells 20 are also arranged along the first direction, and the multiple through holes 32 are also arranged along the first direction. The multiple through holes 32 are all connected to the second groove 31. The second groove 31 can be a strip groove extending along the first direction. As shown in Figure 11, the length direction of the second groove 31 can also extend along the first direction, so that one second groove 31 can be connected to multiple through holes 32 at the same time.

[0206] In order to allow the discharged objects to be discharged from the support member 30, both ends of the second groove 31 along the first direction can extend to the edges of the support member 30, so that the discharged objects can be discharged through the two side edges of the support member 30. Of course, one end of the second groove 31 can also extend to the edge of the support member 30, so that the discharged objects can be discharged through the end of the support member 30 extending to the edge of the support member.

[0207] The second groove 31 extends along the arrangement direction of the battery cells 20 to the edge of the support member 30. On the one hand, one second groove 31 can discharge the discharged materials corresponding to multiple battery cells 20, which is beneficial to reducing the number of second grooves 31 set on the support member 30. On the other hand, the second groove 31 extends to the edge of the support member 30, which facilitates the timely discharge of the discharged materials in the second groove 31 from the battery 100, which is beneficial to improving the pressure relief of the battery cells 20, thereby improving the reliability of the battery 100.

[0208] In some other embodiments, as shown in FIG. 12 , a heat exchange cavity 33 for accommodating a heat exchange medium is disposed in the support member 30 .

[0209] The heat exchange cavity 33 can be used to accommodate a heat exchange medium to adjust the temperature of the multiple battery cells 20, and the heat exchange medium is contained in the heat exchange cavity 33. The heat exchange medium here can be a liquid or a gas, and adjusting the temperature refers to heating or cooling the multiple battery cells 20. In the case of cooling or lowering the temperature of the battery cells 20, the heat exchange cavity 33 is used to accommodate a cooling medium to lower the temperature of the multiple battery cells 20. The heat exchange medium contained therein can also be called a cooling medium, and more specifically, can be called a coolant or a cooling gas. In addition, the heat exchange cavity 33 of the support member 30 can also be used for heating to increase the temperature of the multiple battery cells 20, and the embodiment is not limited to this. For example, the heat exchange cavity 33 of the support member 30 accommodates a coolant to cool the multiple battery cells 20.

[0210] It is understandable that when the heat exchange cavity 33 is filled with cooling medium, it can not only cool the battery cell 20 but also cool the discharged material when the battery cell 20 is in thermal runaway.

[0211] The heat exchange cavity 33 can be implemented in various forms. For example, the support member 30 can be a hollow structure, and the inner cavity of the support member 30 forms the heat exchange cavity 33. For another example, one or more flow channels can be provided inside the support member 30, and the flow channels form the heat exchange cavity 33.

[0212] The support member 30 is provided with a heat exchange cavity 33 for accommodating a heat exchange medium. While supporting the battery cells 20, the support member 30 can also regulate the temperature of the battery cells 20, thus also improving the performance and reliability of the battery 100. Furthermore, the support member 30 is positioned on the side of the battery cells 20 where the pressure relief portion 25 is located. The support member 30 contains a cooling medium, which can promptly cool the discharged material discharged through the pressure relief portion 25, thereby improving the pressure relief safety of the battery 100 and thereby enhancing the performance and reliability of the battery 100.

[0213] In some embodiments, as shown in FIG. 10 , the battery 100 further includes a box body 10 , in which the battery cells 20 and the support member 30 are housed.

[0214] As mentioned above, the box body 10 can have various implementation structures. The box body 10 in the embodiment of the present application can be any conventional container that can accommodate the battery cells 20 and the support members 30.

[0215] The battery 100 includes a housing 10 , which houses and protects the battery cells 20 and the support member 30 , thereby improving the structural integrity of the battery 100 and the performance reliability of the battery 100 .

[0216] Some embodiments of the present application also provide an electrical device, which may include a battery cell 20 as described in any one of the above items, and the battery cell 20 is used to provide electrical energy; or, the electrical device may include a battery 100 as described in any one of the above items, and the battery 100 is used to provide electrical energy.

[0217] The electrical device may be any of the aforementioned devices or systems using the battery 100 or the battery cell 20 .

[0218] Please refer to Figures 5 to 9. Some embodiments of the present application provide a battery cell 20, which includes a shell 22, an electrode assembly 23, an end cover 21, an electrode terminal 24 and a pressure relief portion 25. The shell 22 has an accommodating space 224 and an opening 225 connected to the accommodating space 224. The electrode assembly 23 is accommodated in the accommodating space 224. The end cover 21 closes the opening 225. The electrode terminal 24 is arranged in the shell 22 and is electrically connected to the electrode assembly 23. The pressure relief portion 25 is arranged on the end cover 21. The pressure relief portion 25 is used to release the internal pressure of the shell 22.

[0219] The end cap 21 includes a cover body 211 and a first protrusion 212. The cover body 211 is arranged around the first protrusion 212, and the first protrusion 212 protrudes from the cover body 211 in a direction away from the interior of the housing. The first protrusion 212 includes a first top wall 2121 and a first side wall 2122. The first side wall 2122 is arranged around the first top wall 2121 and connects the first top wall 2121 and the cover body 211. The first top wall 2121 and the first side wall 2122 form a first concave cavity 213 that communicates with the accommodating space 224. A first groove 214 is provided on the side of the first top wall 2121 facing away from the interior of the housing. The pressure relief portion 25 is disposed on the bottom wall of the first groove 214.

[0220] The housing 22 includes a first wall 221. A second protrusion 222 is formed on the side of the first wall 221 facing away from the electrode assembly 23. The second protrusion 222 protrudes from the outer surface of the first wall 221. The second protrusion 222 includes a second top wall 2221 and a second side wall 2222. The second side wall 2222 surrounds the second top wall 2221 and connects the second top wall 2221 and the first wall 221. The second top wall 2221 and the second side wall 2222 define a second concave cavity 223 that communicates with the accommodating space 224. Two electrode terminals 24 are provided. The two electrode terminals 24 are spaced apart on the first wall 221. The second protrusion 222 is located between the two electrode terminals 24. The height of the second protrusion 222 protruding from the first wall 221 is less than or equal to the height of the electrode terminal 24 protruding from the first wall 221.

[0221] Referring to Figures 5 to 14, some embodiments of the present application provide a battery 100 comprising a support member 30 and a plurality of battery cells 20. Each battery cell 20 comprises a housing 22, an electrode assembly 23, an end cap 21, an electrode terminal 24, and a pressure relief portion 25. The housing 22 has an accommodating space 224 and an opening 225 communicating with the accommodating space 224. The electrode assembly 23 is accommodated in the accommodating space 224. The end cap 21 closes the opening 225. The electrode terminal 24 is disposed in the housing 22 and electrically connected to the electrode assembly 23. The pressure relief portion 25 is disposed in the end cap 21 and is used to relieve internal pressure in the housing 22. The end cap 21 comprises a cover body 211 and a first protrusion 212. The cover body 211 is disposed around the first protrusion 212, and the first protrusion 212 protrudes from the cover body 211 in a direction away from the interior of the housing. The first protrusion 212 includes a first top wall 2121 and a first side wall 2122. The first side wall 2122 surrounds the first top wall 2121 and connects the first top wall 2121 to the cover body 211. The first top wall 2121 and the first side wall 2122 form a first concave cavity 213 that communicates with the accommodating space 224. A first groove 214 is provided on the side of the first top wall 2121 facing away from the interior of the housing. The pressure relief portion 25 is disposed on the bottom wall of the first groove 214.

[0222] The battery cells 20 are arranged along a first direction, and the support member 30 is disposed on one side of the battery cells 20 along a second direction, with the first direction being perpendicular to the second direction. The support member 30 is located on the side of the end plate facing away from the housing 22 and has a flat plate-like structure. The thickness of the support member 30 is parallel to the thickness of the end cap 21.

[0223] A second groove 31 is defined on the side of the support member 30 facing away from the battery cells 20. This groove is configured to guide the discharge from the pressure relief port out of the battery. The support member 30 is provided with a plurality of through-holes 32, corresponding one-to-one with the pressure relief portions 25 of the battery cells 20. Each through-hole 32 connects the pressure relief port formed when the pressure relief portion 25 is opened and the second groove 31. The ends of the second groove 31 along the first direction extend to the two side edges of the support member 30 along the first direction. At least a portion of the first sidewall 2122 is inserted into the through-holes 32. A heat exchange chamber 33 for accommodating a heat exchange medium is defined within the support member 30.

[0224] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0225] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery cell, comprising: a housing having an accommodating space and an opening communicating with the accommodating space; an electrode assembly, accommodated in the accommodating space; an end cap for closing the opening; an electrode terminal, disposed on the housing, the electrode terminal being electrically connected to the electrode assembly; as well as A pressure relief portion is provided on the end cover, and is used to release the internal pressure of the shell.

2. The battery cell according to claim 1, wherein: A first groove is provided on a side of the end cover facing away from the electrode assembly, and the pressure relief portion is provided on a bottom wall of the first groove.

3. The battery cell according to claim 1, wherein: The end cover includes a cover body and a first protrusion. The cover body is arranged around the first protrusion, and the first protrusion protrudes from the cover body in a direction away from the interior of the shell.

4. The battery cell according to claim 3, wherein: The first convex portion includes a first top wall and a first side wall. The first side wall is arranged around the first top wall, the first side wall connects the first top wall and the cover body, and the first top wall and the first side wall form a first concave cavity connected to the accommodating space.

5. The battery cell according to claim 4, wherein: The pressure relief portion is disposed on the first top wall. The battery cell according to claim 5 , wherein: A first groove is provided on a side of the first top wall facing away from the interior of the shell, and the pressure relief portion is provided on a bottom wall of the first groove.

7. The battery cell according to any one of claims 1 to 6, wherein: The housing includes a first wall and a second protrusion, the first wall is arranged around the second protrusion, and the second protrusion protrudes from the first wall in a direction away from the interior of the housing.

8. The battery cell according to claim 7, wherein: The second convex portion includes a second top wall and a second side wall. The second side wall is arranged around the second top wall, the second side wall connects the second top wall and the first wall, and the second top wall and the second side wall form a second concave cavity connected to the accommodating space.

9. The battery cell according to claim 7 or 8, wherein: The electrode terminal is disposed on the first wall.

10. The battery cell according to claim 9, wherein: A height of the second protrusion protruding from the first wall is less than or equal to a height of the electrode terminal protruding from the first wall. 11 . The battery cell according to claim 9 , wherein two electrode terminals are provided, the two electrode terminals are spaced apart on the first wall, and the second protrusion is located between the two electrode terminals.

12. The battery cell according to any one of claims 1 to 11, wherein: The housing includes a first wall, the electrode terminal is disposed on the first wall, and the first wall is disposed opposite to the end cover.

13. The battery cell according to any one of claims 1 to 8, wherein: The housing includes a second wall and a third wall that are opposite to each other. Two electrode terminals are provided, one of which is provided on the second wall, and the other is provided on the third wall.

14. A battery comprising the battery cell according to any one of claims 1 to 13.

15. The battery according to claim 14, wherein The battery further comprises: A support member is provided on a side of the end cover facing away from the shell, and the support member is configured to support the battery cell.

16. The battery according to claim 15, wherein There are a plurality of battery cells, which are arranged along a first direction. The support member is located on one side of the battery cell along a second direction, and the first direction is perpendicular to the second direction.

17. The battery according to claim 15 or 16, wherein The support member is provided with a second groove, the second groove is communicated with the pressure relief port formed when the pressure relief portion is opened, and the second groove is configured to guide the discharge discharged from the pressure relief port to be discharged out of the battery.

18. The battery according to claim 17, wherein The second groove is arranged on a side of the support member away from the battery cell. The support member is provided with a through hole, and the through hole communicates with the pressure relief port and the second groove.

19. The battery according to claim 18, wherein The end cover includes a cover body and a first protrusion, the cover body is arranged around the first protrusion, the first protrusion protrudes from the cover body in a direction away from the interior of the housing, the first protrusion includes a first top wall and a first side wall, the first side wall is arranged around the first top wall, the first side wall connects the first top wall and the cover body, and the pressure relief portion is arranged on the first top wall; At least a portion of the first side wall is inserted into the through hole.

20. The battery according to claim 19, wherein The first top wall protrudes from the bottom wall of the second groove.

21. The battery according to claim 20, wherein The height of the first top wall protruding from the bottom wall of the second groove is less than the depth of the second groove.

22. The battery according to any one of claims 18 to 21, wherein There are a plurality of battery cells and a plurality of through holes, and the through holes and the pressure relief portions of the battery cells are arranged in a one-to-one correspondence.

23. The battery according to claim 22, wherein The plurality of battery cells are arranged along a first direction, the second groove extends along the first direction, and at least one end of the second groove extends to an edge of the support member.

24. The battery according to any one of claims 15 to 23, wherein A heat exchange cavity for accommodating a heat exchange medium is provided in the support member.

25. The battery according to any one of claims 15 to 24, wherein The support member is a flat plate structure, and the thickness direction of the support member is parallel to the thickness direction of the end cover.

26. The battery according to any one of claims 15 to 25, wherein The battery further comprises: A box body is provided in which the battery cells and the support member are housed.

27. An electrical device comprising the battery cell according to any one of claims 1 to 13, wherein the battery cell is used to provide electrical energy; or comprising the battery according to any one of claims 14 to 26, wherein the battery is used to provide electrical energy.

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