Battery cell casing assembly and battery cell, battery, and electrical apparatus

Abstract

A battery cell casing assembly and a battery cell, a battery, and an electrical apparatus. The battery cell casing assembly comprises a casing, an explosion-proof valve, and pole terminals; the casing has an opening, and the casing comprises a mounting wall which has a mounting hole that penetrates the mounting wall; the explosion-proof valve is arranged at the mounting hole and is connected to the mounting wall; and the pole terminals are disposed on the mounting wall and are arranged at an interval with the mounting hole inbetween. In the battery cell casing assembly in the embodiments of the present application, the pole terminals are arranged on the mounting wall of the casing, the pole terminals thus increases the structural strength of the mounting wall, and the mounting wall is not prone to deformation, thereby enhancing the protection effect of the casing on an electrode assembly, and facilitating the control over the consistency of the blasting pressure of the explosion-proof valve.

Description

Battery cell shell assembly and battery cell, battery, electrical device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202322632592.6 and application date September 26, 2023, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

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

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become a crucial component of this industry's sustainable development. Battery technology is a crucial factor in the development of electric vehicles. In related art, the housing cover of a battery cell is provided with a mounting hole for accommodating an explosion-proof valve. This compromises the structural strength of the housing cover and reduces the reliability of the battery cell.

[0005] Summary of the Invention

[0006] In view of the above problems, the present application provides a battery cell shell assembly and a battery cell, a battery, and an electrical device, wherein the shell has higher structural strength and is less prone to deformation.

[0007] In a first aspect, the present application provides a shell assembly of a battery cell, comprising: a shell having an opening, the shell comprising a mounting wall with a mounting hole extending therethrough; an explosion-proof valve disposed at the mounting hole and connected to the mounting wall; and a pole disposed on the mounting wall and spaced apart from the mounting hole.

[0008] In the technical solution of the embodiment of the present application, by arranging the pole on the mounting wall of the shell body, the pole is used to increase the structural strength of the mounting wall, so that the mounting wall is not easily deformed, thereby enhancing the protective effect of the shell body on the electrode assembly and facilitating the control of the consistency of the explosion pressure of the explosion-proof valve.

[0009] In some embodiments, a through hole is formed through the installation wall, and the pole is arranged at the through hole and connected to the installation wall.

[0010] The through-holes are used to provide clearance for the connection between the pole and the electrode assembly. When the pole is positioned within the through-holes, they can be electrically connected at the through-holes, allowing the pole to output electrical energy from the battery cell to an external circuit. The poles are connected to the mounting wall, reinforcing the area near the through-holes on the mounting wall, thereby strengthening the overall structural strength of the mounting wall and preventing deformation.

[0011] In some embodiments, the outer peripheral wall of the pole has an annular groove extending along its circumference, and the annular groove cooperates with the edge of the through hole.

[0012] The coupling of the annular groove and the edge of the through-hole allows the pole to be securely fixed to the mounting wall, preventing it from falling off. Furthermore, the coupling of the annular groove and the edge of the through-hole restricts the movement of the pole, thereby reducing the possibility of collision between the pole and the edge of the through-hole. This allows the pole to be more stably electrically connected to the battery cell, enabling the pole to more stably output the electrical energy within the battery cell to an external circuit. Furthermore, by stably securing the pole to the through-hole on the mounting wall, even if the pressure inside the battery cell is high and one side of the pole is under pressure, the pole is unlikely to fall off the mounting wall, thereby more stably enhancing the structural strength of the mounting wall.

[0013] In some embodiments, the minimum distance between the edge of the through hole and the edge of the mounting hole is 1 mm-30 mm.

[0014] The distance between the edge of the through hole and the edge of the mounting hole where they are closest to each other is set to be greater than or equal to 1 mm, so that the mounting hole and the through hole are not electrically connected. A solid area of ​​at least 1 mm is provided between the mounting hole and the through hole, reserving a press-fitting area for stamping, thereby facilitating the formation of the through hole and the mounting hole on the mounting wall. The distance between the edge of the through hole and the edge of the mounting hole where they are closest to each other is set to be less than or equal to 30 mm, so that the mounting hole and the through hole are not far apart. By reducing the spacing between the mounting hole and the through hole, after the pole is positioned at the through hole, the pole can fully enhance the structural strength of the area near the through hole on the mounting wall. Since the through hole and the mounting hole are not far apart, after the pole is positioned at the through hole, the pole can fully reduce the impact of the mounting hole on the structural strength of the mounting wall, thereby fully enhancing the overall structural strength of the mounting wall.

[0015] In some embodiments, the mounting hole includes a first hole segment and a second hole segment arranged and connected in the thickness direction of the mounting wall, and the second hole segment is close to the inner cavity of the shell body relative to the first hole segment; wherein a first step surface is formed between the first hole segment and the second hole segment, and the explosion-proof valve is arranged in the first hole segment and cooperates with the first step surface.

[0016] The second hole segment can separate the first hole segment from the space inside the shell body. In this way, after the explosion-proof valve is set on the first step surface, there is at least the first hole segment between the explosion-proof valve and the components inside the shell body. In this way, when the air pressure inside the battery cell increases, the gas can gather at the first hole segment. The gas can directly apply pressure to the explosion-proof valve from the first hole segment. When the air pressure inside the battery cell exceeds the critical value, the air pressure can destroy the explosion-proof valve, thereby achieving pressure relief of the battery cell.

[0017] In some embodiments, the mounting hole also includes a third hole section, the third hole section is connected to the end of the first hole section away from the second hole section, a second step surface is formed between the first hole section and the third hole section, the explosion-proof valve is welded to the mounting wall to form a weld, and the third hole section is used to accommodate the weld.

[0018] When the explosion-proof valve is welded to the mounting wall, the formed weld will protrude from the explosion-proof valve, and the third hole section can reserve space for the weld. In this way, when the components are set on the mounting wall, the possibility of scratches between the components and the weld can be reduced, thereby protecting the components and the weld, so that the weld can stably connect the explosion-proof valve and the mounting wall, thereby stably fixing the explosion-proof valve on the mounting wall.

[0019] In some embodiments, the shell assembly of the battery cell further includes: a protective sheet, which is provided on a side of the explosion-proof valve away from the second hole section and is used to cover the explosion-proof valve.

[0020] The protective sheet covering the explosion-proof valve can separate the explosion-proof valve from the external environment, play a dust-proof role, and can reduce the area of ​​contact between the explosion-proof valve and the external air, which is convenient for reducing the oxidation rate of the explosion-proof valve.

[0021] In some embodiments, the mounting hole also includes a fourth hole segment, the fourth hole segment is connected to the end of the third hole segment away from the first hole segment, a third step surface is formed between the fourth hole segment and the third hole segment, and the protective sheet is arranged in the fourth hole segment and cooperates with the third step surface.

[0022] The protective sheet is supported on the third step surface so that the protective sheet is set on the side of the explosion-proof valve away from the inside of the shell body, so that the protective sheet can isolate the explosion-proof valve from the external environment and play a dust-proof role. The protective sheet is set in the fourth hole section, and the fourth hole section can reserve space for the setting of the protective sheet so that the protective sheet can be set in the mounting hole, reducing the volume of the protective sheet leaking out of the mounting hole, and thus reducing the possibility of objects in the external environment scratching the protective sheet, so as to protect the protective sheet.

[0023] In some embodiments, an exhaust groove is provided on a side of the mounting wall facing away from the inner cavity of the shell body, the exhaust groove is communicated with the mounting hole, and the protective sheet covers a portion of the exhaust groove.

[0024] After the protective sheet is set on the mounting wall, there is at least a third hole section between the protective sheet and the explosion-proof valve, that is, one side of the protective sheet is the third hole section, and the other side is the external environment, so that the exhaust groove is connected to the third hole section to balance the air pressure on both sides of the protective sheet. In this way, when the external environment pressure is high or the air pressure in the third hole section is high, the possibility of the protective sheet being damaged can be reduced, so that the protective sheet can fully protect the explosion-proof valve.

[0025] In some embodiments, the cross-sectional shape of the exhaust slot is square, trapezoidal or triangular.

[0026] In some embodiments, the explosion-proof valve is an integrally formed part and has a thinned portion; or, the explosion-proof valve is a split structure.

[0027] When the air pressure inside the battery cell exceeds the critical value, the air pressure can preferentially destroy the thinning part or the connection area of ​​the split structure, and then destroy the explosion-proof valve, so that the interior of the battery cell is connected to the external environment, thereby achieving pressure relief for the battery cell.

[0028] In some embodiments, one pole is provided on the installation wall, and the pole and the explosion-proof valve are spaced apart in the length direction of the installation wall.

[0029] In some embodiments, at least two poles are provided on the installation wall, and at least two poles are spaced apart in the length direction of the installation wall, and the explosion-proof valve is located between the two poles.

[0030] The explosion-proof valve is located between the two poles. After the poles are set at the through-holes, the two poles are located on both sides of the mounting hole, so as to strengthen the structural strength of the area near the mounting hole on the mounting wall from both sides of the mounting hole, thereby facilitating to fully reduce the influence of the mounting hole on the structural strength of the mounting wall and fully strengthen the structural strength of the mounting wall.

[0031] In some embodiments, the mounting wall is located on a wall of the shell body opposite to the opening.

[0032] The installation wall is located on the wall opposite to the shell body and the opening. When the electrode assembly is installed in the shell body, the pole on the installation wall is conveniently arranged opposite the electrode assembly, and then when the electrode assembly is installed to the specified position, the pole is conveniently electrically connected to the electrode assembly.

[0033] In the second aspect, the present application provides a battery cell, comprising: a shell body assembly of the battery cell of the above embodiment; an electrode assembly, the electrode assembly being arranged in the shell body and comprising an active material coating portion and a conductive portion connected to the active material coating portion, the conductive portion being electrically connected to the pole; and a shell cover, the shell cover being covered over the opening to enclose the electrode assembly in the shell body.

[0034] In the technical solution of the embodiment of the present application, by arranging the pole on the mounting wall of the shell body, the pole is used to increase the structural strength of the mounting wall, so that the mounting wall is not easily deformed, thereby enhancing the protective effect of the shell body on the electrode assembly and facilitating the control of the consistency of the explosion pressure of the explosion-proof valve.

[0035] In some embodiments, the mounting wall is located on a wall of the shell body opposite to the opening, the pole is provided with an accommodating portion, and at least a portion of the conductive portion extends into the accommodating portion.

[0036] In the technical solution of the embodiment of the present application, by accommodating at least part of the conductive part in the accommodating part, the space occupied by the battery cell itself can be reduced, so that a battery of the same volume can accommodate a larger number of battery cells, and the volume energy density of the battery can be improved; in addition, by accommodating at least part of the conductive part in the accommodating part to occupy the space in the pole, the redundancy of the conductive part in the shell can be reduced to at least a certain extent, the probability of short circuit between the conductive part and the active material coating part is reduced, the probability of short circuit of the battery cell is reduced, and the working reliability and stability of the battery cell and the battery are improved.

[0037] In some embodiments, the accommodating portion includes a first accommodating groove, the surface of the pole facing the active material coating portion is the inner end face of the pole, the notch of the first accommodating groove is formed on the inner end face of the pole, and at least part of the conductive portion is accommodated in the first accommodating groove.

[0038] In the above technical solution, on the one hand, the first receiving groove in the terminal can reduce the weight of the terminal to a certain extent, thereby improving the weight energy density of the battery cell and the battery. On the other hand, because the notch of the first receiving groove is formed on the inner end surface of the terminal, and the inner end surface of the terminal is the surface of the terminal near the active material coating portion, the first receiving groove can be opened toward the active material coating portion, thereby facilitating the insertion of the conductive portion into the first receiving groove and improving assembly efficiency. Moreover, this type of first receiving groove is easy to process and improves production efficiency.

[0039] In some embodiments, the accommodating portion includes a second accommodating groove, the surface of the pole away from the active material coating portion is the outer end face of the pole, the notch of the second accommodating groove is formed on the outer end face of the pole, the second accommodating groove is connected to the inner cavity of the shell body through a through hole, the conductive portion is passed through the through hole and is at least partially accommodated in the second accommodating groove.

[0040] In the above technical solution, on the one hand, the pole is provided with a second receiving groove, which can reduce the weight of the pole to a certain extent, so as to improve the weight energy density of the battery cell and the battery; on the other hand, since the notch of the second receiving groove is formed on the outer end face of the pole, and the outer end face of the pole is the surface of the pole away from the active material coating part, the second receiving groove can be open in the direction away from the active material coating part. In this way, when at least part of the conductive part is accommodated in the second receiving groove, the conductive part can be easily stored and sorted through the notch of the second receiving groove, and the electrical connection operation between the conductive part and the pole can be easily achieved through the notch of the second receiving groove, thereby reducing the production difficulty of the battery cell and improving the production efficiency of the battery cell.

[0041] In a third aspect, the present application provides a battery comprising a battery cell according to the aforementioned embodiment. By disposing a terminal post on a mounting wall of a battery housing, the terminal post increases the structural strength of the mounting wall, making the mounting wall less susceptible to deformation, thereby enhancing the protective effect of the battery housing on the electrode assembly and facilitating control of the consistency of the explosion pressure of the explosion-proof valve.

[0042] Fourthly, the present application provides an electrical device comprising the battery of the aforementioned embodiment. By arranging the electrode posts on the mounting wall of the housing, the electrode posts are utilized to increase the structural strength of the mounting wall, making the mounting wall less susceptible to deformation, thereby enhancing the protective effect of the housing on the electrode assembly and facilitating control of the consistency of the explosion pressure of the explosion-proof valve.

[0043] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0045] FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0046] FIG2 is an exploded view of a battery according to some embodiments of the present application;

[0047] FIG3 is a schematic structural diagram of a battery cell according to some embodiments of the present application;

[0048] FIG4 is a cross-sectional view of a battery cell according to some embodiments of the present application;

[0049] FIG5 is an exploded view of a battery cell according to some embodiments of the present application;

[0050] FIG6 is a top view of a housing assembly according to some embodiments of the present application;

[0051] FIG7 is a cross-sectional view of a battery cell according to some embodiments of the present application;

[0052] FIG8 is an enlarged view of point A in FIG7 ;

[0053] FIG9 is an enlarged view of a portion of the area in FIG7 ;

[0054] FIG10 is an enlarged view of a partial area of ​​a cross-sectional view of a battery cell according to some embodiments of the present application, where the mounting hole includes a first hole segment and a second hole segment;

[0055] FIG11 is an enlarged view of a partial area of ​​a cross-sectional view of a battery cell according to some embodiments of the present application, where the mounting hole includes a first hole segment, a second hole segment, and a third hole segment;

[0056] FIG12 is an enlarged view of a partial area of ​​a cross-sectional view of a battery cell according to some embodiments of the present application, where the mounting hole includes a first hole segment, a second hole segment, a third hole segment, and a fourth hole segment;

[0057] FIG13 is an enlarged view of a partial area of ​​a cross-sectional view of a battery cell according to some embodiments of the present application;

[0058] FIG14 is an enlarged view of point B in FIG6 ;

[0059] FIG15 is a cross-sectional view of a battery cell according to some embodiments of the present application;

[0060] FIG16 is an enlarged view of point C in FIG15 ;

[0061] FIG17 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0062] FIG18 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0063] FIG19 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0064] FIG20 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0065] FIG21 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0066] FIG22 is a schematic partial cross-sectional view of a battery cell provided in some embodiments of the present application.

[0067] Reference numerals: vehicle 1000;

[0068] Battery 100, controller 200, motor 300;

[0069] Battery cell 10, shell assembly 101;

[0070] Housing 11, housing body 111, opening 1110, housing cover 112, through hole 113, mounting wall 114, mounting hole 115, first hole section 1151, second hole section 1152, third hole section 1153, fourth hole section 1154, first step surface 1161, second step surface 1162, third step surface 1163, exhaust groove 117;

[0071] Electrode 12, positive electrode 1201, negative electrode 1202, accommodating portion 121, first accommodating groove 12110, first end wall 12111, first recessed groove 12112, first side wall 12113, second accommodating groove 12120, second end wall 12121, second recessed groove 12122, second side wall 12123, through-hole 12130, electrode inner end surface 122, electrode outer end surface 123, first groove 126, spacer 127, annular groove 128;

[0072] Cover plate 13, first conductive member 131, second groove 1311, second conductive member 132;

[0073] protective sheet 14;

[0074] Box body 20, first part 201, second part 202;

[0075] Electrode assembly 2, active material coating portion 21, conductive portion 22;

[0076] Bracket 3 , through hole 314 , insulating member 4 , explosion-proof valve 6 , thickness-reduced portion 61 , slot cover 7 . DETAILED DESCRIPTION

[0077] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0078] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0079] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0080] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0081] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0082] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0083] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0084] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0085] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0086] A battery cell is generally provided with an explosion-proof valve, which is used to release the internal pressure of the battery cell when the internal pressure or temperature of the battery cell reaches a threshold value.

[0087] The shell of the battery cell in the related art includes a shell cover and a shell body. The shell body has a cavity and an opening for accommodating the electrode assembly. The shell cover is used to close the opening. A mounting hole is provided on the shell cover, and an explosion-proof valve is provided at the mounting hole. When the internal pressure or temperature of the battery cell reaches a threshold, the explosion-proof valve can be broken through, so that the inside of the battery cell is connected with the outside, thereby achieving the purpose of depressurizing the battery cell.

[0088] However, due to the small size of the shell cover, setting a mounting hole on the shell cover will reduce the structural strength of the shell cover, which will easily affect the protective effect of the shell cover on the inside of the battery cell. When the pressure inside the battery cell is high, the shell cover is more likely to deform, resulting in reduced reliability of the battery cell.

[0089] In order to improve the reliability of the battery cell, the present application sets the mounting hole on the shell body. Since the volume of the shell body is larger than the volume of the shell cover, compared with the related art, the present application sets the mounting hole on the shell body. The proportion of space occupied by the mounting hole on the shell body is smaller, and the impact of the mounting hole on the structural strength of the shell body is smaller.

[0090] In addition, the present application arranges the pole and the mounting hole on the same wall of the shell body, so that the pole is arranged close to the mounting hole. In this way, the use of the pole can enhance the structural strength of the shell body. When the pressure inside the battery cell is large, the shell body is not easy to deform, and the pressure can be concentrated at the explosion-proof valve, and the explosion-proof valve is used to achieve pressure relief of the battery cell.

[0091] The battery disclosed in the embodiments of the present application is used as a power source for an electrical device or various energy storage systems using the battery as an energy storage element. The electrical 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, and the like. Among them, 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, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0092] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0093] 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.

[0094] 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.

[0095] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 20 and a battery cell 10, with the battery cell 10 being housed within the housing 20. The housing 20 is used to provide a storage space for the battery cell 10, and the housing 20 can adopt a variety of structures. In some embodiments, the housing 20 can include a first portion 201 and a second portion 202, which cover each other and together define a storage space for accommodating the battery cell 10. The second portion 202 can be a hollow structure with one end open, and the first portion 201 can be a plate-like structure, with the first portion 201 covering the open side of the second portion 202, so that the first portion 201 and the second portion 202 jointly define a storage space. The first portion 201 and the second portion 202 can also be hollow structures with one end open, with the open side of the first portion 201 covering the open side of the second portion 202. Of course, the box body 20 formed by the first part 201 and the second part 202 can be in various shapes, such as a cylinder, a cuboid, etc.

[0096] In the battery 100, there may be multiple battery cells 10, and the multiple battery cells 10 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 10. The multiple battery cells 10 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 10 may be housed within the housing 20. Of course, the battery 100 may also be formed by first connecting multiple battery cells 10 in series, in parallel, or in a hybrid connection to form a battery module, and then the multiple battery modules may be connected in series, in parallel, or in a hybrid connection to form an entire battery cell, and then housed within the housing 20. The battery 100 may also include other structures, for example, the battery 100 may further include a busbar component for electrically connecting the multiple battery cells 10.

[0097] Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 10 can be cylindrical, flat, rectangular, or in other shapes.

[0098] Please refer to Figures 3 and 4. Figure 3 is a schematic diagram of the structure of a battery cell 10 provided in some embodiments of the present application, and Figure 4 is a cross-sectional view of the structure of a battery cell 10 provided in some embodiments of the present application. The battery cell 10 includes a housing 11 and an electrode assembly 2. The housing 11 may include a body 111 and a cover 112.

[0099] The housing cover 112 is a component that covers the opening of the housing 111 to isolate the internal environment of the battery cell 10 from the external environment. The shape of the housing cover 112 can be adapted to the shape of the housing 111 to complement the housing 111. Optionally, the housing cover 112 can be made of a material with a certain degree of hardness and strength (such as aluminum alloy). This makes the housing cover 112 less susceptible to deformation during compression and collision, thus providing the battery cell 10 with greater structural strength and improved reliability.

[0100] The housing cover 112 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic, and is not particularly limited in this embodiment of the present application. In some embodiments, an insulating member can be disposed inside the housing cover 112 to isolate the electrical connection components within the housing body 111 from the housing cover 112 to reduce the risk of short circuits. Exemplary insulating members can be made of plastic, rubber, and the like.

[0101] The housing 111 is a component that cooperates with the housing cover 112 to form the internal environment of the battery cell 10. This internal environment can be used to accommodate the electrode assembly 2, electrolyte, and other components. Functional components such as the electrode post 12 are provided on the housing 111. The electrode post 12 can be used to electrically connect to the electrode assembly 2 to output or input electrical energy to the battery cell 10. The housing 111 is also provided with an explosion-proof valve 6, which is used to release internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold.

[0102] The housing 111 and the housing cover 112 can be separate components. An opening 1110 can be provided on the housing 111, and the housing cover 112 can be closed at the opening 1110 to form an internal environment for the battery cell 10. Alternatively, the housing cover 112 and the housing 111 can be integrated. Specifically, the housing cover 112 and the housing 111 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 111 needs to be enclosed, the housing cover 112 can be closed over the housing 111.

[0103] The housing 111 can have various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 111 can be determined based on the specific shape and size of the electrode assembly 2. The housing 111 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this.

[0104] The electrode assembly 2 is a component in the battery cell 100 where electrochemical reactions occur. One or more electrode assemblies 2 may be included in the shell 111. The electrode assembly 2 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the active material coating part 21. The active material coating part 21 includes the positive active material coating part and the negative active material coating part. The parts of the positive and negative electrode sheets without active materials each constitute a conductive part 22, such as the tabs. The tabs include the positive tab and the negative tab. The positive tab and the negative tab may be located together at one end of the active material coating part 21 or respectively at both ends of the active material coating part 21. During the charge and discharge process of the battery 100, the active material coating part 21 reacts with the electrolyte, and the conductive part 22 connects the pole 12 to form a current loop.

[0105] As shown in Figures 3 and 4, the battery cell 10 also includes a bracket 3, an insulating member 4, and an explosion-proof valve 6. The bracket 3 is located at one end of the active material coating 21 and is provided with a through-hole 314 through which the tab 22 can pass to connect to the electrode post 12. The insulating member 4 is connected to the bracket 3 and together they wrap around the circumference of the electrode assembly 2. The insulating member 4 can be used to isolate the electrical connection components within the housing 11 from the housing 11 to reduce the risk of short circuits. Exemplarily, the insulating member 4 can be made of plastic, rubber, etc. The insulating member 4 and the bracket 3 can be connected by adhesive or heat-seal, although other methods are also possible. The explosion-proof valve 6 is located on the housing 11 and is used to release internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold. The explosion-proof valve 6 can be located on the housing cover 112 or the housing body 111.

[0106] Please refer to Figures 5 and 6. Figure 5 is an exploded view of a battery cell 10 according to some embodiments of the present application, and Figure 6 is a top view of a housing assembly 101 according to some embodiments of the present application. The present application provides a housing assembly 101 for a battery cell 10. The housing assembly 101 of the battery cell 10 includes a housing 111 having an opening 1110. The housing 111 includes a mounting wall 114. The mounting wall 114 is a wall of the housing 111 having a mounting hole 115 extending therethrough, so that the mounting hole 115 communicates with the interior of the housing 111.

[0107] The shell assembly 101 of the battery cell 10 further includes an explosion-proof valve 6 and a pole 12 . The explosion-proof valve 6 is disposed at the mounting hole 115 and connected to the mounting wall 114 . The pole 12 is disposed on the mounting wall 114 and spaced apart from the mounting hole 115 .

[0108] The explosion-proof valve 6 can be fixedly connected to the mounting wall 114 or detachably connected. The explosion-proof valve 6 is arranged at the mounting hole 115 and covers the mounting hole 115 to seal the mounting hole 115 and isolate the environment inside the shell 111 from the external environment. One side of the explosion-proof valve 6 faces the interior of the shell 111. This side of the explosion-proof valve 6 is subject to the pressure inside the battery cell 10. When the pressure inside the battery cell 10 exceeds a critical value, the pressure inside the battery cell 10 can break through the explosion-proof valve 6. At this time, the interior of the shell 111 is connected to the external environment, thereby achieving pressure relief for the battery cell 10. The provision of the explosion-proof valve 6 can improve the safety of the battery cell 10 and reduce the possibility of explosion.

[0109] The terminal 12 is used to electrically connect to the electrode assembly 2 within the housing 111. The terminal 12 can be made of a metal such as copper, aluminum, or a metal composite. The terminal 12 is used to output the electrical energy within the battery to the external circuit. There are many types of terminals 12, including cylindrical, square, and flat ones. These are not particularly limited here. The terminal 12 on the mounting wall 114 can be either a positive terminal 1201 or a negative terminal 1202.

[0110] Since the mounting hole 115 is provided on the mounting wall 114, the provision of the mounting hole 115 will reduce the structural strength of the mounting wall 114. By providing the pole 12 on the mounting wall 114, the pole 12 and the mounting hole 115 are spaced apart, and the pole 12 is utilized to enhance the structural strength of the mounting wall 114, thereby enhancing the structural strength of the shell 111, thereby facilitating the improvement of the protective effect of the shell 111 on the electrode assembly 2, and making the mounting wall 114 less likely to deform. In this way, even if the pressure inside the battery cell 10 is relatively high, the mounting wall 114 is less likely to deform, so as to maintain the stability of the pressure on the explosion-proof valve 6, and facilitate the control of the consistency of the bursting pressure of the explosion-proof valve 6.

[0111] Specifically, if the mounting wall 114 is deformed, the size of the space inside the shell body 111 will change. At this time, the pressure on the explosion-proof valve 6 will change. When the shell body 111 is deformed to different degrees, the pressure inside the battery cell 10 when breaking through the explosion-proof valve 6 is different. By arranging the pole 12 on the mounting wall 114 and utilizing the pole 12 to enhance the structural strength of the mounting wall 114, the mounting wall 114 is less likely to deform, and the size of the space inside the shell body 111 is less likely to change. This facilitates improving the stability of the pressure on the explosion-proof valve 6 and facilitates controlling the consistency of the bursting pressure of the explosion-proof valve 6.

[0112] Please refer to Figure 6, and further refer to Figures 7 and 8. Figure 7 is a cross-sectional view of the battery cell 10 of some embodiments of the present application, and Figure 8 is an enlarged view of point A in Figure 7. A through hole 113 is opened through the mounting wall 114, and the pole 12 is arranged at the through hole 113. The pole 12 is connected to the mounting wall 114.

[0113] The through hole 113 is formed through the mounting wall 114, which means that the through hole 113 extends through the thickness of the mounting wall 114 and is connected to the interior of the housing 111. In this way, when the electrode 12 is arranged in the through hole 113, it is convenient to achieve electrical connection between the electrode 12 and the electrode assembly 2 inside the housing 111. The connection between the electrode 12 and the mounting wall 114 can be a fixed connection or a detachable connection.

[0114] Through-hole 113 is used to provide clearance for the connection between terminal 12 and electrode assembly 2. When terminal 12 is positioned within through-hole 113, the two electrodes can be electrically connected at through-hole 113, allowing terminal 12 to output electrical energy from the battery cell 10 to an external circuit. Terminal 12 is connected to mounting wall 114, reinforcing the area near through-hole 113 on mounting wall 114, thereby strengthening the overall structural strength of mounting wall 114 and preventing deformation.

[0115] 8 , the outer peripheral wall of the pole 12 has an annular groove 128 extending along its circumference. The annular groove 128 cooperates with the edge of the through hole 113 .

[0116] The shape of the pole 12 can be a cylinder, the annular groove 128 is located on the side of the pole 12 and extends around the circumference of the pole 12. In the axial direction of the pole 12, the projection of the annular groove 128 is formed into a circle, and correspondingly, the through hole 113 is a circular through hole 113; the shape of the pole 12 can also be an elliptical cylinder, the annular groove 128 is located on the side of the pole 12 and extends around the circumference of the pole 12. In the axial direction of the pole 12, the projection of the annular groove 128 is formed into an ellipse, and correspondingly, the through hole 113 is an elliptical through hole 113. Of course, the shape of the pole 12 can be a cone, a truncated cone, a cube, etc., and there are no excessive restrictions here.

[0117] The annular groove 128 cooperates with the edge of the through hole 113 to firmly secure the terminal 12 to the mounting wall 114, preventing the terminal 12 from falling off the mounting wall 114. Furthermore, the annular groove 128 cooperates with the edge of the through hole 113 to restrict the movement of the terminal 12, thereby reducing the possibility of collision between the terminal 12 and the edge of the through hole 113. This allows the terminal 12 to be more stably electrically connected to the battery cell 10, enabling the terminal 12 to more stably output the electrical energy within the battery cell 10 to the external circuit. Furthermore, by stably securing the terminal 12 to the through hole 113 on the mounting wall 114, even if the pressure inside the battery cell 10 is high and one side of the terminal 12 is under pressure, the terminal 12 is unlikely to fall off the mounting wall 114, thereby more stably enhancing the structural strength of the mounting wall 114.

[0118] Please refer to FIG. 9 , which is an enlarged view of a portion of FIG. 7 . The minimum distance L between the edge of the through hole 113 and the edge of the mounting hole 115 is 1 mm to 30 mm.

[0119] The through hole 113 extends along the X direction, and the mounting hole 115 extends along the X direction. The distance between one end of the through hole 113 close to the mounting hole 115 in the X direction and the other end of the mounting hole 115 close to the through hole 113 in the X direction is the minimum distance L, and the value of L is 1 mm-30 mm. As shown in Figure 8, the X direction is the left-right direction, and the through hole 113 and the mounting hole 115 both extend along the left-right direction. If the mounting hole 115 is located on the right side of the through hole 113, the distance between the right end of the through hole 113 and the left end of the mounting hole 115 is the minimum distance L, and the value of L is 1 mm-30 mm. If the mounting hole 115 is located on the left side of the through hole 113, the distance between the left end of the through hole 113 and the right end of the mounting hole 115 is the minimum distance L, and the value of L is 1 mm-30 mm.

[0120] The through hole 113 and the mounting hole 115 can be formed by punching and pressing. Of course, the through hole 113 and the mounting hole 115 can also be formed by other processes, and no further restrictions are imposed here.

[0121] In the above technical solution, the distance between the edge of the through hole 113 and the edge of the mounting hole 115 where they are close to each other is limited to be greater than or equal to 1 mm, so that the mounting hole 115 and the through hole 113 will not be connected, and there is a solid area of ​​at least 1 mm between the mounting hole 115 and the through hole 113, so as to reserve a press-fitting area for stamping processing, thereby facilitating the processing of forming the through hole 113 and the mounting hole 115 on the mounting wall 114.

[0122] By limiting the distance between the portions where the edges of the through-hole 113 and the edges of the mounting hole 115 are close to each other to be less than or equal to 30 mm, the mounting hole 115 is not far from the through-hole 113. By reducing the spacing between the mounting hole 115 and the through-hole 113, after the pole 12 is arranged at the through-hole 113, the pole 12 can fully enhance the structural strength of the area near the through-hole 113 on the mounting wall 114. Since the through-hole 113 and the mounting hole 115 are not far from each other, after the pole 12 is arranged at the through-hole 113, the pole 12 can fully reduce the impact of the mounting hole 115 on the structural strength of the mounting wall 114, thereby fully enhancing the overall structural strength of the mounting wall 114.

[0123] The distance between the edge of the through hole 113 and the edge of the mounting hole 115 where they are close to each other may be 1 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm or 30 mm.

[0124] Please continue to refer to Figure 9 and Figure 10. Figure 10 is an enlarged view of a partial area of ​​the cross-sectional view of the battery cell 10 in some embodiments of the present application. The mounting hole 115 includes a first hole segment 1151 and a second hole segment 1152 arranged and connected in the thickness direction of the mounting wall 114. The second hole segment 1152 is close to the inner cavity of the shell body 111 relative to the first hole segment 1151, wherein a first step surface 1161 is formed between the first hole segment 1151 and the second hole segment 1152, and the explosion-proof valve 6 is arranged in the first hole segment 1151 and cooperates with the first step surface 1161.

[0125] The first hole section 1151 is connected to the second hole section 1152, and the aperture of the first hole section 1151 is larger than the aperture of the second hole section 1152, so that a first step surface 1161 can be formed between the first hole section 1151 and the second hole section 1152. When the explosion-proof valve 6 is placed in the mounting hole 115, the first step surface 1161 can support the position of the explosion-proof valve 6 so that the explosion-proof valve 6 is set on one side of the electrode assembly 2.

[0126] Among them, the explosion-proof valve 6 is arranged on the mounting wall 114 of the shell body 111, the electrode assembly 2 is arranged inside the shell body 111, the mounting wall 114 has a certain thickness, and the second hole section 1152 can separate the first hole section 1151 and the space inside the shell body 111. In this way, after the explosion-proof valve 6 is set on the first step surface 1161, there is at least the first hole section 1151 between the explosion-proof valve 6 and the components inside the shell body 111. In this way, when the air pressure inside the battery cell 10 increases, the gas can converge to the first hole section 1151, and the gas can directly apply pressure to the explosion-proof valve 6 from the first hole section 1151. When the air pressure inside the battery cell 10 is higher than the critical value, the air pressure can destroy the explosion-proof valve 6, thereby realizing the pressure relief of the battery cell 10.

[0127] By providing the first hole section 1151 and the second hole section 1152, gas can be gathered at the first hole section 1151, thereby reducing the gas pressure on other areas of the shell body 111. The gas can be gathered on one side of the explosion-proof valve 6, thereby making full use of the explosion-proof valve 6 to relieve the pressure on the battery cell 10.

[0128] In addition, there is at least a first hole section 1151 between the explosion-proof valve 6 and the components inside the shell body 111, so that the explosion-proof valve 6 maintains a distance from the components inside the shell body 111, thereby reducing the possibility of the explosion-proof valve 6 scratching the components inside the shell body 111.

[0129] Please refer to Figure 11, which is an enlarged view of a partial area of ​​the cross-sectional view of the battery cell 10 in some embodiments of the present application. The mounting hole 115 also includes a third hole segment 1153. The third hole segment 1153 is connected to the end of the first hole segment 1151 away from the second hole segment 1152. A second step surface 1162 is formed between the first hole segment 1151 and the third hole segment 1153. The explosion-proof valve 6 is welded to the mounting wall 114 to form a weld. The third hole segment 1153 is used to accommodate the weld.

[0130] First hole section 1151 is located between second hole section 1152 and third hole section 1153. First hole section 1151, second hole section 1152, and third hole section 1153 are interconnected. Explosion-proof valve 6 is supported on first step surface 1161. Explosion-proof valve 6 is located within first hole section 1151 and is welded to the edge of first hole section 1151. When explosion-proof valve 6 is supported on first step surface 1161, a seam is formed between explosion-proof valve 6 and the edge of first hole section 1151.

[0131] The seam between the explosion-proof valve 6 and the edge of the first hole section 1151 can be welded together by laser welding, ultrasonic welding, or welding rod welding, thereby forming a weld seam between the explosion-proof valve 6 and the first hole section 1151. When welding the explosion-proof valve 6 and the mounting wall 114 together, the welding can be performed from the side of the explosion-proof valve 6 facing away from the interior of the housing 11, or from the side of the explosion-proof valve 6 facing the interior of the housing 11, without further limitation.

[0132] For example, when the explosion-proof valve 6 is welded to the hole edge of the first hole section 1151 by welding with welding rods, the "weld" here refers to the seam formed by melting the welding rod and the metal at the joint using the high temperature of the welding heat source. After the weld metal cools down, the explosion-proof valve 6 and the mounting wall 114 are connected as a whole.

[0133] Among them, the first step surface 1161 can preliminarily locate the position of the explosion-proof valve 6. After the explosion-proof valve 6 is supported on the first step surface 1161, it is convenient to weld the explosion-proof valve 6 and the hole edge of the first hole section 1151 to stably fix the explosion-proof valve 6 and the mounting wall 114 together.

[0134] When the explosion-proof valve 6 is welded to the mounting wall 114, the formed weld will protrude from the explosion-proof valve 6. The third hole section 1153 can reserve space for the weld. In this way, when the components are set on the mounting wall 114, the possibility of scratches between the components and the weld can be reduced, thereby protecting the components and the weld, so that the weld can stably connect the explosion-proof valve 6 and the mounting wall 114, so as to stably fix the explosion-proof valve 6 on the mounting wall 114.

[0135] Please refer to Figure 10. The thickness of the explosion-proof valve 6 extends along the Z direction. The explosion-proof valve 6 is arranged in the first hole section 1151. The depth of the first hole section 1151 along the Z direction is greater than the thickness of the explosion-proof valve 6. In this way, when the explosion-proof valve 6 is welded and fixed to the installation wall 114, the first hole section 1151 can also reserve space for the weld.

[0136] 11 , the housing assembly 101 further includes a protective sheet 14 . The protective sheet 14 is disposed on a side of the explosion-proof valve 6 away from the second hole section 1152 , and is used to cover the explosion-proof valve 6 .

[0137] The protective sheet 14 may be a plate-like structure or a film-like structure, and there are no further restrictions here.

[0138] The protective sheet 14 covering the explosion-proof valve 6 can separate the explosion-proof valve 6 from the external environment, play a dust-proof role, and can reduce the area of ​​contact between the explosion-proof valve 6 and the external air, which makes it easier to reduce the oxidation rate of the explosion-proof valve 6.

[0139] Among them, the protective sheet 14 is arranged on the side of the explosion-proof valve 6 away from the second hole section 1152, the protective sheet 14 is located on the side of the third hole section 1153, the protective sheet 14 is supported on the mounting wall 114, the third hole section 1153 is located between the protective sheet 14 and the explosion-proof valve 6, and the third hole section 1153 is used to reserve space for the weld to reduce the possibility of contact between the protective sheet 14 and the weld, thereby facilitating the protection of the protective sheet 14 and reducing the possibility of the weld scratching the protective sheet 14.

[0140] Please refer to Figure 12, which is an enlarged view of a partial area of ​​the cross-sectional view of the battery cell 10 in some embodiments of the present application. The mounting hole 115 also includes a fourth hole segment 1154, which is connected to the end of the third hole segment 1153 away from the first hole segment 1151. A third step surface 1163 is formed between the fourth hole segment 1154 and the third hole segment 1153. The protective sheet 14 is arranged in the fourth hole segment 1154 and cooperates with the third step surface 1163.

[0141] The aperture of the fourth hole section 1154 is larger than the aperture of the third hole section 1153 , so that a third step surface 1163 can be formed between the third aperture and the fourth aperture. The third step surface 1163 is used to support the position of the protection sheet 14 .

[0142] The protective sheet 14 is supported on the third step surface 1163 so that the protective sheet 14 is set on the side of the explosion-proof valve 6 away from the inside of the shell body 111, so that the protective sheet 14 can isolate the explosion-proof valve 6 from the external environment and play a dust-proof role. The protective sheet 14 is set in the fourth hole section 1154, and the fourth hole section 1154 can reserve space for the setting of the protective sheet 14, so that the protective sheet 14 can be set in the mounting hole 115, reducing the volume of the protective sheet 14 leaking out of the mounting hole 115, thereby reducing the possibility of objects in the external environment scratching the protective sheet 14, so as to protect the protective sheet 14.

[0143] Please continue to refer to Figure 12. The depth of the mounting hole 115 extends in the up and down directions. The mounting hole 115 includes the fourth hole section 1154, the third hole section 1153, the first hole section 1151 and the second hole section 1152 from top to bottom. The apertures of the fourth hole section 1154, the third hole section 1153, the first hole section 1151 and the second hole section 1152 decrease in sequence and define the third step surface 1163, the second step surface 1162 and the first step surface 1161 in sequence. The explosion-proof valve 6 is supported on the first step surface 1161, the explosion-proof valve 6 is located in the first hole section 1151, the protective sheet 14 is supported on the third step surface 1163, and the protective sheet 14 is located in the fourth hole section 1154.

[0144] The second hole section 1152 separates the first hole section 1151 from the space inside the shell body 111. In this way, after the explosion-proof valve 6 is set on the first step surface 1161, there is at least the first hole section 1151 between the explosion-proof valve 6 and the components inside the shell body 111. In this way, when the air pressure inside the battery cell 10 increases, the gas can converge at the first hole section 1151. The gas can directly apply pressure to the explosion-proof valve 6 from the first hole section 1151. When the air pressure inside the battery cell 10 is higher than the critical value, the air pressure can destroy the explosion-proof valve 6, thereby achieving pressure relief of the battery cell 10.

[0145] When the explosion-proof valve 6 is welded to the mounting wall 114, the formed weld will protrude from the explosion-proof valve 6. The third hole section 1153 can reserve space for the weld. In this way, when the components are set on the mounting wall 114, the possibility of scratches between the components and the weld can be reduced, thereby protecting the components and the weld, so that the weld can stably connect the explosion-proof valve 6 and the mounting wall 114, so as to stably fix the explosion-proof valve 6 on the mounting wall 114.

[0146] Please refer to Figure 13, which is an enlarged view of a partial area of ​​the cross-sectional view of the battery cell 10 of some embodiments of the present application. The explosion-proof valve 6 is provided at the mounting hole 115, and the explosion-proof valve 6 is welded to the hole edge of the mounting hole 115 to weld and fix the explosion-proof valve 6 to the mounting wall 114 so that the explosion-proof valve 6 can close the mounting hole 115. When the internal pressure of the battery cell 10 is higher than the critical value, the air pressure inside the battery cell 10 can break through the explosion-proof valve 6. At this time, the interior and exterior of the battery cell 10 are connected through the through hole 113, thereby achieving the purpose of relieving the pressure of the battery cell 10.

[0147] Among them, the depth of the mounting hole 115 extends in the up and down directions, the thickness of the explosion-proof valve 6 extends in the up and down directions, and the depth of the mounting hole 115 is greater than the thickness of the explosion-proof valve 6. In this way, after the explosion-proof valve 6 is set in the mounting hole 115, a part of the space can be reserved below the mounting hole 115 or a part of the space can be reserved above the mounting hole 115.

[0148] The space reserved below the mounting hole 115 is located between the explosion-proof valve 6 and the components in the shell 11. In this way, when the air pressure inside the battery cell 10 increases, the gas can gather below the explosion-proof valve 6. The gas can directly apply pressure to the explosion-proof valve 6 from below the explosion-proof valve 6. When the air pressure inside the battery cell 10 is higher than the critical value, the air pressure can destroy the explosion-proof valve 6, thereby achieving pressure relief of the battery cell 10.

[0149] The space reserved above the mounting hole 115 can reserve space for the weld formed by welding the explosion-proof valve 6 and the mounting wall 114. In this way, when the components are set on the mounting wall 114, the possibility of scratches between the components and the weld can be reduced, thereby protecting the components and the weld, so that the weld can stably connect the explosion-proof valve 6 and the mounting wall 114, so as to stably fix the explosion-proof valve 6 on the mounting wall 114.

[0150] Please refer to Figure 10 and further refer to Figure 14, which is an enlarged view of point B in Figure 6. An exhaust groove 117 is provided on the side of the mounting wall 114 facing away from the inner cavity of the shell body 111. The exhaust groove 117 is connected to the mounting hole 115, and the protective sheet 14 covers a portion of the exhaust groove 117.

[0151] After the protective sheet 14 is set on the mounting wall 114, there is at least a third hole section 1153 between the protective sheet 14 and the explosion-proof valve 6. That is, one side of the protective sheet 14 is the third hole section 1153, and the other side is the external environment, so that the exhaust groove 117 is connected to the third hole section 1153 to balance the air pressure on both sides of the protective sheet 14. In this way, when the external environment pressure is large or the air pressure in the third hole section 1153 is large, the possibility of the protective sheet 14 being damaged can be reduced, so that the protective sheet 14 can fully protect the explosion-proof valve 6.

[0152] Optionally, the cross-section of the exhaust slot 117 is square, trapezoidal or triangular.

[0153] The cross-sectional shapes of the exhaust groove 117 in different areas may also be different. The shape and size of the cross-sectional shape of the exhaust groove 117 can be determined according to actual needs and the size of the installation wall 114, etc., and no excessive restrictions are imposed here.

[0154] Please refer to FIG15 and FIG16 , FIG15 is a cross-sectional view of the battery cell 10 of some embodiments of the present application, and FIG16 is an enlarged view of point C in FIG15 , in which the cross section of the exhaust groove 117 is a triangle.

[0155] 13 and 14 , the explosion-proof valve 6 is an integrally formed part and has a reduced thickness portion 61 .

[0156] By laser cutting or CNC punching the surface of the explosion-proof valve 6, the thickness of a portion of the explosion-proof valve 6 is reduced to form a reduced thickness portion 61. The thickness of the reduced thickness portion 61 can be determined according to the pressure to which the explosion-proof valve 6 is subjected.

[0157] When the air pressure in the battery cell 10 exceeds a critical value, the air pressure can first destroy the reduced thickness portion 61 and then destroy the explosion-proof valve 6 , thereby connecting the interior of the battery cell 10 to the external environment and releasing the pressure of the battery cell 10 .

[0158] Optionally, the explosion-proof valve 6 is a split structure.

[0159] The explosion-proof valve 6 has a split structure, which means that the explosion-proof valve 6 includes multiple components that cooperate with each other to form the explosion-proof valve 6. The structural strength of the area where the components cooperate is relatively low. When the air pressure inside the battery cell 10 exceeds a critical value, the air pressure can destroy the area where the components cooperate, thereby destroying the explosion-proof valve 6, allowing the interior of the battery cell 10 to communicate with the external environment, thereby relieving the pressure of the battery cell 10.

[0160] Optionally, a pole 12 is provided on the installation wall 114, and the pole 12 and the explosion-proof valve 6 are spaced apart in the length direction of the installation wall 114. The pole 12 on the installation wall 114 can be a positive pole 1201 or a negative pole 1202.

[0161] The length direction of the mounting wall 114 extends along the X direction, and the pole 12 and the explosion-proof valve 6 are spaced apart in the X direction. By arranging both the pole 12 and the explosion-proof valve 6 on the mounting wall 114, the pole 12 can be utilized to reduce the influence of the mounting hole 115 on the structural strength of the mounting wall 114. At the same time, the pole 12 and the explosion-proof valve 6 are spaced apart in the X direction, so that the pole 12 and the explosion-proof valve 6 are arranged at appropriate positions on the mounting wall 114, thereby reducing the probability of mutual influence between the pole 12 and the explosion-proof valve 6.

[0162] Optionally, at least two poles 12 are provided on the mounting wall 114, and the at least two poles 12 are spaced apart in the longitudinal direction of the mounting wall 114, with the explosion-proof valve 6 located between the two poles 12. The multiple poles 12 on the mounting wall 114 can all be positive poles 1201, all be negative poles 1202, or some can be positive poles 1201 and some can be negative poles 1202.

[0163] The explosion-proof valve 6 is located between the two poles 12. After the pole 12 is set at the through hole 113, the two poles 12 are located on both sides of the mounting hole 115, so as to strengthen the structural strength of the area near the mounting hole 115 on the mounting wall 114 from both sides of the mounting hole 115, thereby facilitating to fully reduce the impact of the mounting hole 115 on the structural strength of the mounting wall 114, and fully strengthen the structural strength of the mounting wall 114.

[0164] Please refer to Figure 6. Two poles 12 are provided on the mounting wall 114, and the mounting wall 114 extends in the left and right directions. The two poles 12 and the explosion-proof valve 6 are arranged at intervals in the left and right directions, and the explosion-proof valve 6 is located between the two poles 12. Two through holes 113 are provided on the mounting wall 114, and the two poles 12 are arranged in the through holes 113 in a one-to-one correspondence. When the through holes 113 and the mounting holes 115 are processed on the mounting wall 114, the through holes 113 and the mounting holes 115 are arranged at intervals along the length direction of the mounting wall 114. On the one hand, it is convenient for processing and reduces the situation where the through holes 113 and the mounting holes 115 are connected, which is convenient for reducing the processing difficulty. On the other hand, it is convenient to arrange the through holes 113 and the mounting holes 115 at appropriate positions on the mounting wall 114, so as to maximize the structural strength of the mounting wall 114, so that there is a certain distance between the through holes 113 and the mounting holes 115, and reduce the possibility of the structural strength of the local area of ​​the mounting wall 114 being too low.

[0165] The explosion-proof valve 6 is located between the two poles 12. In this way, after the pole 12 is set at the through hole 113, the two poles 12 are located on both sides of the mounting hole 115, so as to strengthen the structural strength of the area near the mounting hole 115 on the mounting wall 114 from both sides of the mounting hole 115, thereby facilitating to fully reduce the impact of the mounting hole 115 on the structural strength of the mounting wall 114, and fully strengthen the structural strength of the mounting wall 114.

[0166] 5 , the installation wall 114 is located on the wall of the housing 111 opposite to the opening 1110 .

[0167] The mounting wall 114 is arranged opposite to the opening 1110, that is, if the opening 1110 is located at the lower part of the shell body 111, the upper wall surface of the shell body 111 is formed as the mounting wall 114; if the opening 1110 is arranged on the left side wall of the shell body 111, the right side wall of the shell body 111 is formed as the mounting wall 114; if the opening 1110 is arranged on the front side wall of the shell body 111, the rear side wall of the shell body 111 is formed as the mounting wall 114.

[0168] The installation wall 114 is located on the wall opposite to the shell body 111 and the opening 1110. When the electrode assembly 2 is installed in the shell body 111, it is convenient to set the pole 12 on the installation wall 114 opposite to the electrode assembly 2. Then, when the electrode assembly 2 is installed to the specified position, the pole 12 is convenient to be electrically connected to the electrode assembly 2.

[0169] Please refer to Figure 5. The present application also provides a battery cell 10, which includes a shell body assembly 101, an electrode assembly 2 and a shell cover 112 of any of the above schemes. The electrode assembly 2 is arranged in the shell body 111 and includes an active material coating portion 21 and a conductive portion 22 connected to the active material coating portion 21. The conductive portion 22 is electrically connected to the pole 12. The shell cover 112 covers the opening 1110 to enclose the electrode assembly 2 in the shell body 111.

[0170] By arranging the pole 12 on the mounting wall 114 of the shell body 111, the pole 12 is used to increase the structural strength of the mounting wall 114, so that the mounting wall 114 is not easily deformed, thereby improving the protective effect of the shell body 111 on the electrode assembly 2, and facilitating the control of the consistency of the bursting pressure of the explosion-proof valve 6.

[0171] Please refer to Figure 5 and further to Figures 17 and 18. Figure 17 is a schematic partial cross-sectional view of a battery cell 10 provided in some embodiments of the present application. Figure 18 is a schematic partial cross-sectional view of a battery cell 10 provided in some embodiments of the present application. The mounting wall 114 is located on the wall of the housing 111 opposite the opening 1110. The terminal 12 defines a receiving portion 121. At least a portion of the conductive portion 22 extends into and is received in the receiving portion 121. The conductive portion 22 is electrically connected to the terminal 12. In other words, the terminal 12 is configured as a hollow structure.

[0172] Here, "at least partially" means that the conductive portion 22 can be completely accommodated in the accommodating portion 121, or only partially accommodated in the accommodating portion 121. Since the terminal 12 is provided with the accommodating portion 121, the hollow structure of the accommodating portion 121 can, on the one hand, reduce the weight of the terminal 12 to a certain extent, thereby improving the weight energy density of the battery cell 10 and the battery 100. On the other hand, the conductive portion 22 can be accommodated in the accommodating portion 121, which improves the assembly efficiency of the conductive portion 22 and saves the space occupied by the conductive portion 22, making full use of the space in the battery cell 10, making the structure of the battery cell 10 more compact, and further conducive to improving the energy density of the battery cell 10.

[0173] More specifically, by partially or entirely containing the conductive portion 22 within the accommodating portion 121, the portion of the conductive portion 22 located within the accommodating portion 121 can occupy the space within the terminal 12, thereby reducing the space occupied by the conductive portion 22 within the housing 11. When the size of the housing 11 is fixed, some space can be saved within the housing 11 to accommodate a larger active material coating portion 21, thereby improving the volumetric energy density of the battery cell 10. For example, when the conductive portion 22 is extended from the side of the active material coating portion 21 close to the terminal 12, the space occupied by the conductive portion 22 between the active material coating portion 21 and the terminal 12 can be reduced, the size of the active material coating portion 21 in the direction in which the conductive portion 22 is extended can be increased, the distance between the active material coating portion 21 and the terminal 12 can be reduced, and the energy density of the battery cell 10 can be improved.

[0174] At the same time, by accommodating at least part of the conductive part 22 in the accommodating part 121, the space occupied by the battery cell 10 itself can be reduced, so that the battery 100 of the same volume can accommodate a larger number of battery cells 10, and the volume energy density of the battery 100 can be improved; in addition, accommodating at least part of the conductive part 22 in the accommodating part 121 to occupy the space in the terminal 12 can reduce the redundancy of the conductive part 22 in the shell 11 to at least a certain extent, reduce the probability of short circuit between the conductive part 22 and the active material coating part 21, reduce the probability of short circuit of the battery cell 10, and improve the working reliability and stability of the battery cell 10 and the battery 100.

[0175] It should be noted that, in the embodiment of the present application, the accommodation portion 121 may be located on the side of the pole 12 facing the active material coating portion 21 or on the side of the pole 12 facing away from the active material coating portion 21 .

[0176] For example, please refer to Figures 17 and 18 again. When the accommodating portion 121 is located on the side of the pole 12 facing the active material coating portion 21, the accommodating portion 121 includes a first accommodating groove 12110. The surface of the pole 12 facing the active material coating portion 21 is the pole inner end face 122. The notch of the first accommodating groove 12110 is formed on the pole inner end face 122, and at least a portion of the conductive portion 22 is accommodated in the first accommodating groove 12110.

[0177] Exemplarily, the first receiving groove 12110 is a groove body, which is a groove-like structure with a certain depth. For example, when the pole 12 is disposed on the upper end wall of the housing 11 and the pole inner end surface 122 is the lower surface of the pole 12, the first receiving groove 12110 is formed as a receiving groove with a groove opening open downward and the groove wall recessed upward. For another example, when the pole 12 is disposed on the lower end wall of the housing 11 and the pole inner end surface 122 is the upper surface of the pole 12, the first receiving groove 12110 is formed as a receiving groove with a groove opening open upward and the groove wall recessed downward.

[0178] In the above technical solution, on the one hand, the first receiving groove 12110 provided on the terminal 12 can reduce the weight of the terminal 12 to a certain extent, thereby increasing the weight energy density of the battery cell 10 and the battery 100. On the other hand, because the notch of the first receiving groove 12110 is formed on the terminal inner end surface 122, which is the surface of the terminal 12 on the side close to the active material coating portion 21, the first receiving groove 12110 can be opened toward the active material coating portion 21, thereby facilitating the insertion of the conductive portion 22 into the first receiving groove 12110 and improving assembly efficiency. Furthermore, this type of first receiving groove 12110 is easier to process, improving production efficiency.

[0179] In addition, the first receiving groove 12110 can be easily processed to have a larger volume, which can accommodate more conductive parts 22; at the same time, since the first receiving groove 12110 is open toward the active material coating part 21, the first receiving groove 12110 can also serve as a buffer and temporary storage structure for the electrolyte, so that more electrolyte can be accommodated in the shell 11. Since the battery cell 10 will lose electrolyte during the charging and discharging process, when there is more electrolyte, the service life of the battery cell 10 can be extended; and also because the first receiving groove 12110 is open toward the active material coating part 21, the first receiving groove 12110 can also serve as a storage and buffer structure for gas production inside the electrode assembly 2, reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0180] In addition, since the first receiving groove 12110 is located on the inner side of the pole 12, external foreign matter and impurities are not easy to enter the first receiving groove 12110, which can reduce the impact of external foreign matter and impurities on the electrode assembly 2, and improve the stability and reliability of the electrode assembly 2, thereby improving the stability and reliability of the battery cell 10 and the battery 100.

[0181] Referring again to FIG. 17 , in the embodiment of the present application, the connection method between the pole 12 and the housing 11 is not limited, and can be welding or riveting. For example, when the two are riveted, the housing 11 has a through hole 113, and the pole 12 is riveted to the through hole 113. Of course, it is understood that when the two are welded or otherwise coupled, the housing 11 may also have a through hole 113 to facilitate the installation of the pole 12 in the housing 11 through the through hole 113, and this is not limited here.

[0182] At the same time, the first receiving groove 12110 can be arranged corresponding to the position of the through hole 113, or in other words, on a projection plane perpendicular to the axial direction R of the pole 12, the orthographic projection of the first receiving groove 12110 is located within the orthographic projection range of the through hole 113, so that the first receiving groove 12110 can have a greater depth to accommodate more conductive parts 22, thereby greatly reducing the space occupied by the conductive parts 22 within the housing 11. Specifically, when the through hole 113 is formed in the housing 11 and the pole 12 is installed in the through hole 113, along the axial direction R of the pole 12, the depth H1 of the first receiving groove 12110 is greater than or equal to the minimum distance H2 from the inner end face 122 of the pole to the through hole 113.

[0183] It should be noted that the specific shape of the first receiving groove 12110 is not limited and can be regular or irregular, such as a cylindrical groove with a rectangular, elliptical, or racetrack-shaped cross-section, a trapezoidal groove with a rectangular cross-section and gradually changing cross-sectional dimensions, a hemispherical groove with a circular cross-section and gradually changing cross-sectional dimensions, or a hemispherical groove with an elliptical cross-section and gradually changing cross-sectional dimensions, etc. Therefore, the depth H1 of the first receiving groove 12110 refers to the maximum depth of the first receiving groove 12110 along the axial direction R of the pole 12.

[0184] Since in the axial direction R of the pole 12, the depth H1 of the first accommodating groove 12110 is greater than or equal to the minimum distance H2 from the inner end face 122 of the pole to the through hole 113, the volume of the pole 12 can be fully utilized, so that the first accommodating groove 12110 has a larger depth, which is conducive to accommodating more conductive parts 22, and thus can greatly reduce the space occupied by the conductive parts 22 in the shell 11, further improve the energy density of the battery cell 10, and further reduce the redundancy of the conductive parts 22 in the shell 11; at the same time, since the first accommodating groove 12110 has a larger depth, it can also accommodate the gas production of the electrode assembly 2, improve the reliability and stability of the battery cell 10, and can also accommodate more electrolyte to increase the service life of the battery cell 10.

[0185] Please refer to Figures 17 and 18 again. In order to improve the stability and reliability of the electrical connection between the active material coating portion 21 and the pole 12, in some embodiments of the present application, the electrical connection position between the conductive portion 22 and the pole 12 can be located on the groove wall of the first accommodating groove 12110 formed by the accommodating portion 121.

[0186] Exemplarily, the conductive part 22 and the pole 12 can be electrically connected by welding, and the electrical connection position is the welding position of the conductive part 22 and the pole 12. At the same time, the welding method of the conductive part 22 and the pole 12 is not limited, for example, it can be laser welding, and according to factors such as the position, angle, or structure of the welding part, vertical welding, inclined welding, lap welding, or edge welding can be selected. In other embodiments of the present application, the conductive part 22 and the pole 12 can also be electrically connected by other means instead of welding, such as by providing conductive glue or conductive nails. To simplify the description, the following text will take the case where the conductive part 22 and the pole 12 are welded to form an electrical connection, and the welding position is the electrical connection position of the conductive part 22 and the pole 12 as an example for introduction.

[0187] Specifically, the electrode 12 includes a first end wall 12111 and a first side wall 12113. The first end wall 12111 is located on a side of the first side wall 12113 away from the active material coating portion 21. The first end wall 12111 and the first side wall 12113 enclose a first receiving groove 12110. The electrical connection position between the conductive portion 22 and the electrode 12 is located on the first end wall 12111 and / or the first side wall 12113. In other words, the conductive portion 22 can be welded to at least one of the first end wall 12111 and the first side wall 12113.

[0188] In the above technical solution, by arranging the electrical connection position between the conductive portion 22 and the terminal 12 on at least one of the first end wall 12111 and the first side wall 12113, the first receiving groove 12110 not only serves to accommodate at least a portion of the conductive portion 22, but the groove wall of the first receiving groove 12110 also serves to establish an electrical connection with the conductive portion 22. This simplifies the structure of the terminal 12, facilitates the processing of the terminal 12, simplifies the structure of the conductive portion 22, reduces redundancy in the conductive portion 22, and reduces the cost of the conductive portion 22. Furthermore, by utilizing the groove wall of the first receiving groove 12110 to establish an electrical connection with the conductive portion 22, the area where the conductive portion 22 is electrically connected to the terminal 12 can be set relatively large, which not only reduces the difficulty of electrical connection, but also improves the reliability and stability of the electrical connection, thereby improving the performance of the battery cell 10.

[0189] In addition, since the electrical connection position between the conductive part 22 and the pole 12 is located in the first receiving groove 12110, it can not only prevent the electrical connection position from protruding from the outside of the pole 12 and occupying the space outside the pole 12, but also enable the electrical connection position to be protected by the pole 12, thereby improving the reliability and stability of the electrical connection between the conductive part 22 and the pole 12.

[0190] In addition, in an embodiment of the present application, the first end wall 12111 is constructed as a closed structure without a through-hole 12130, so that the first receiving tank 12110 is isolated from the external space of the shell 11, which can reduce the problem of the electrolyte in the shell 11 leaking from the first receiving tank 12110.

[0191] Referring again to Figures 17 and 18, in some optional embodiments, the shape of a portion of the conductive portion 22 matches the shape of a portion of the first end wall 12111, and the conductive portion 22 is positioned to fit and electrically connect to the first end wall 12111, such that the portion where the conductive portion 22 electrically connects to the first end wall 12111 extends along the length or width of the first end wall 12111. For example, when the first end wall 12111 is planar, a portion of the conductive portion 22 may also be planar and fit to the first end wall 12111, and an electrical connection, such as welding, may be made at the fitting portion. This increases the area of ​​the electrical connection, improving the reliability and stability of the electrical connection.

[0192] In addition, when the electrical connection between the conductive part 22 and the first end wall 12111 is welding, since the first end wall 12111 is located on the side of the first receiving groove 12110 away from the active material coating part 21, it is convenient to perform welding operations. For example, welding can be performed from the side of the pole 12 away from the active material coating part 21.

[0193] It is worth noting that the shape of the first end wall 12111 is not limited, and can be, for example, a flat plate, an arc-shaped plate, etc. Specifically, when the first end wall 12111 is a flat plate structure, the first end wall 12111 is arranged at an angle to the axial direction R of the pole 12. For example, the first end wall 12111 can be a flat plate structure perpendicular to the axial direction R of the pole 12, or can be an inclined plate structure that is not perpendicular to the axial direction R of the pole 12, but the inclination direction is not limited.

[0194] Of course, in other embodiments of the present application, the position where the conductive part 22 is electrically connected to the first end wall 12111 may not extend along the length or width direction of the first end wall 12111. For example, it may be a plurality of discretely arranged points. For example, the conductive part 22 has a plurality of spaced-apart parts that are respectively welded to the first end wall 12111, which will not be elaborated here.

[0195] Please refer to Figure 19, which is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. When the conductive portion 22 is electrically connected to the first end wall 12111, a first sinking groove 12112 can be provided on the first end wall 12111, and the sinking direction of the first sinking groove 12112 is away from the active material coating portion 21. At least a portion of the position where the conductive portion 22 is electrically connected to the first end wall 12111 is located within the first sinking groove 12112. For example, at least a portion of the conductive portion 22 can be disposed within the first sinking groove 12112 and connected to the portion of the first end wall 12111 that is used to define the first sinking groove 12112.

[0196] In the above technical solution, on the one hand, the first sinking groove 12112 can be used to realize pre-positioning and limiting of the electrical connection position of the conductive part 22, which is not only conducive to finding the correct position to realize electrical connection and improve production efficiency, but also helps to improve the stability and reliability of the conductive part 22, and improve the stability and reliability of the battery cell 10 during the charging and discharging process; on the other hand, by arranging the first sinking groove 12112 on the first end wall 12111, the local wall thickness of the first end wall 12111 can be locally thinned, which is not only conducive to welding, but also helps to reduce the weight of the pole 12 and improve the weight energy density of the battery cell 10.

[0197] Please refer to Figures 18 and 19 again. In the embodiment of the present application, the pole 12 can also be provided with a first groove 126 as needed. The first groove 126 is located on the side of the pole 12 away from the active material coating portion 21, that is, the surface of the side of the pole 12 away from the active material coating portion 21 is the pole outer end face 123, and the notch of the first groove 126 is formed on the pole outer end face 123.

[0198] It is understood that the first groove 126 is a groove body, which is a groove-like structure with a certain depth. Moreover, when the pole 12 is arranged on the upper end wall of the shell 11 and the pole outer end surface 123 is the upper surface of the pole 12, the first groove 126 is formed as a first groove 126 with a groove opening open upward and a groove wall recessed downward (i.e., a square recessed toward the electrode assembly 2). For another example, when the pole 12 is arranged on the lower end wall of the shell 11 and the pole outer end surface 123 is the lower surface of the pole 12, the first groove 126 is formed as a first groove 126 with a groove opening open downward and a groove wall recessed upward (i.e., a square recessed toward the electrode assembly 2).

[0199] In the above technical solution, on the one hand, since the pole 12 is provided with the first groove 126, the weight of the pole 12 can be further reduced, so as to improve the weight energy density of the battery cell 10 and the battery 100; on the other hand, the first groove 126 is located on the outside of the pole 12, that is, it is open to the side of the pole 12 away from the interior of the shell 11. The first groove 126 can be used to accommodate or install structural components in the battery 100 that electrically connect the various battery cells 10, so as to make full use of the space inside the pole 12 and improve the space utilization and volume energy density of the battery 100.

[0200] In addition, since the terminal 12 has both the first receiving groove 12110 and the first groove 126, the first groove 126 is located on the side of the first receiving groove 12110 away from the active material coating portion 21, and the first groove 126 is open in a direction away from the first receiving groove 12110. This facilitates laser welding of the conductive portion 22 to the first end wall 12111 through the first groove 126 from the outside of the terminal 12, that is, the side of the terminal 12 away from the active material coating portion 21, thereby facilitating electrical connection between the conductive portion 22 and the terminal 12 through external welding. In other words, the above-mentioned structural arrangement facilitates external welding of the terminal 12 and the conductive portion 22 through the first groove 126, facilitates the processing and manufacturing of the battery cell 10, and can save processing and manufacturing costs.

[0201] Furthermore, in order to conveniently and effectively weld the conductive part 22 to the groove wall of the first receiving groove 12110 through the first groove 126, and improve the welding reliability of the groove wall of the conductive part 22 to the first receiving groove 12110, in an embodiment of the present application, the part between the first groove 126 and the first receiving groove 12110 can be laser welded to the conductive part 22, that is, the spacer part 127 shown in Figure 19 can be laser welded to the conductive part 22 to achieve electrical connection between the electrode assembly 2 and the pole 12. The thickness of the spacer 127 of the pole 12 located between the first groove 126 and the first receiving groove 12110 is relatively thin. The spacer 127 isolates the first groove 126 and the first receiving groove 12110. The side wall of the spacer 127 close to the active material coating part 21 can be used as the first end wall 12111. When the conductive part 22 needs to be welded to the first end wall 12111, since the thickness of the spacer 127 is relatively thin, it is conducive to welding the conductive part 22 and the first end wall 12111 through the first groove 126, thereby improving the convenience and reliability of welding.

[0202] Please refer to Figure 18 again. Furthermore, the battery cell 10 may also include a slot cover 7, which is provided on the pole 12 and covers the notch of the first groove 126. In the above technical solution, by providing the slot cover 7 to cover the first groove 126, the pole 12 can be indirectly electrically connected to the busbar through the slot cover 7. By adjusting the position and structure of the slot cover 7, the electrical connection between the slot cover 7 and the busbar can be more convenient and the electrical connection area can be larger. Therefore, by providing the slot cover 7, the electrical connection between adjacent battery cells 10 in the battery 100 can be facilitated. Since the position where the battery cells 10 are electrically connected to each other is located at the slot cover 7, the electrical connection position between the conductive portion 22 and the pole 12 can be separated by the first groove 126, and there is less interference between the two, which can further improve the stability and reliability of the battery cell 10.

[0203] For example, please refer to Figure 20, which is a partial cross-sectional schematic diagram of the battery cell 10 provided in some embodiments of the present application. The accommodating portion 121 can also be configured to include a second accommodating groove 12120. The surface of the pole 12 away from the active material coating portion 21 is the pole outer end face 123. The notch of the second accommodating groove 12120 is formed on the pole outer end face 123. The second accommodating groove 12120 is connected to the interior of the shell 11 through the through hole 12130. The conductive portion 22 is passed through the through hole 12130 and is at least partially accommodated in the second accommodating groove 12120.

[0204] It is understood that the second receiving groove 12120 is a groove body, which is a groove-like structure with a certain depth. For example, when the pole 12 is disposed on the upper end wall of the housing 11 and the pole outer end surface 123 is the upper surface of the pole 12, the second receiving groove 12120 is formed as a receiving groove with an upwardly open groove opening and a downwardly recessed groove wall. For another example, when the pole 12 is disposed on the lower end wall of the housing 11 and the pole outer end surface 123 is the lower surface of the pole 12, the second receiving groove 12120 is formed as a receiving groove with a downwardly open groove opening and an upwardly recessed groove wall.

[0205] In the above technical solution, please refer to Figure 20 again. On the one hand, the pole 12 is provided with a second receiving groove 12120, which can reduce the weight of the pole 12 to a certain extent, so as to improve the weight energy density of the battery cell 10 and the battery 100; on the other hand, since the notch of the second receiving groove 12120 is formed on the outer end face 123 of the pole, and the outer end face 123 of the pole is the surface of the pole 12 away from the active material coating part 21, the second receiving groove 12120 can be open in the direction away from the active material coating part 21. In this way, when at least part of the conductive part 22 is accommodated in the second receiving groove 12120, the conductive part 22 can be easily stored and sorted through the notch of the second receiving groove 12120, and the electrical connection operation between the conductive part 22 and the pole 12 can be easily achieved through the notch of the second receiving groove 12120, thereby reducing the production difficulty of the battery cell 10 and improving the production efficiency of the battery cell 10.

[0206] At the same time, since the second receiving tank 12120 can be connected to the interior of the shell 11 through the perforation 12130, the second receiving tank 12120 can also serve as a buffer and temporary storage structure for the electrolyte, so that more electrolyte can be accommodated in the shell 11. Since the battery cell 10 will lose electrolyte during the charging and discharging process, when there is more electrolyte, the service life of the battery cell 10 can be extended; and because the second receiving tank 12120 can be connected to the interior of the shell 11 through the perforation 12130, the second receiving tank 12120 can also serve as a receiving and buffer structure for gas production inside the electrode assembly 2, reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0207] It is worth noting that when the accommodating portion 121 has a second accommodating groove 12120 and the conductive portion 22 is disposed through the through-hole 12130 and is at least partially accommodated within the second accommodating groove 12120, the electrical connection position between the conductive portion 22 and the terminal 12 is not limited. For example, when the conductive portion 22 is disposed through the through-hole 12130 and is at least partially accommodated within the second accommodating groove 12120, in the embodiment of the present application, the electrical connection position between the conductive portion 22 and the terminal 12 is located at the hole wall of the through-hole 12130 formed in the terminal 12.

[0208] In the above technical solution, by setting the electrical connection position between the conductive part 22 and the pole 12 on the hole wall of the through-hole 12130, it is convenient to electrically connect the conductive part 22 and the pole 12 through the second accommodating groove 12120, and when the electrical connection area between the conductive part 22 and the pole 12 is large, the electrical connection between the conductive part 22 and the pole 12 can be used to achieve the sealing of the through-hole 12130, so as to save sealing costs, reduce electrolyte leakage, and save sealing parts.

[0209] Specifically, the conductive part 22 can be welded to the hole wall of the through-hole 12130 at the position where the through-hole 12130 is connected to the second receiving groove 12120, which is convenient for operation. In addition, the through-hole 12130 can be sealed by controlling the weld mark and utilizing the weld mark and the conductive part 22 to improve the problem of electrolyte in the shell 11 leaking from the through-hole 12130.

[0210] As another example, when the conductive portion 22 is provided through the through-hole 12130 and is at least partially accommodated in the second receiving groove 12120, in other embodiments of the present application, the electrical connection position between the conductive portion 22 and the pole 12 may also be located on the groove wall of the second receiving groove 12120 formed by the pole 12. This facilitates the electrical connection operation. For example, when the conductive portion 22 is welded to the groove wall of the second receiving groove 12120 formed by the pole 12, the conductive particles generated by the welding can be prevented from entering the housing 11 and causing problems such as a short circuit.

[0211] Please refer to Figure 20 again. The pole 12 includes a second end wall 12121 and a second side wall 12123. The second end wall 12121 is located on the side of the second side wall 12123 close to the active material coating portion 21. The second end wall 12121 and the second side wall 12123 are arranged to form a second receiving groove 12120. The through hole 12130 is opened on the second end wall 12121. The electrical connection position between the conductive portion 22 and the pole 12 is located on the second end wall 12121 and / or on the second side wall 12123.

[0212] More specifically, the conductive portion 22 and the pole 12 can be electrically connected by welding, so the welding position is the electrical connection position between the conductive portion 22 and the pole 12. In other embodiments of the present application, the conductive portion 22 and the pole 12 can also be electrically connected by other methods instead of welding, such as by providing conductive glue or conductive nails, which will not be described in detail here.

[0213] To simplify the description, the following description uses the example of welding the conductive portion 22 to the pole 12 to form an electrical connection, where the welding location is the electrical connection location between the conductive portion 22 and the pole 12. For example, in some embodiments, the electrical connection location between the conductive portion 22 and the pole 12 is located at the second end wall 12121 and / or the second side wall 12123, and the conductive portion 22 may be welded to at least one of the second end wall 12121 and the second side wall 12123.

[0214] In the above technical solution, by locating the electrical connection point between the conductive portion 22 and the terminal 12 on at least one of the second end wall 12121 and the second side wall 12123, the second receiving groove 12120 not only accommodates at least part of the conductive portion 22, but also the groove wall of the second receiving groove 12120 also functions to achieve electrical connection with the conductive portion 22. This simplifies the structure of the terminal 12 and facilitates the processing of the terminal 12. Furthermore, because the through-hole 12130 is provided in the second end wall 12121, the conductive portion 22 can easily extend into the second receiving groove 12120 through the through-hole 12130, simplifying the structure of the conductive portion 22, reducing redundancy in the conductive portion 22, and lowering the cost of the conductive portion 22. Moreover, the opening direction of the slot of the second receiving groove 12120 makes it easy to electrically connect the conductive part 22 with the slot wall of the second receiving groove 12120 through the slot of the second receiving groove 12120, which can reduce the difficulty of electrical connection. Moreover, by utilizing the slot wall of the second receiving groove 12120 to achieve electrical connection with the conductive part 22, the area where the conductive part 22 is electrically connected to the pole 12 can be relatively large, which can improve the reliability and stability of the electrical connection, thereby improving the performance of the battery cell 10.

[0215] In addition, since the electrical connection position between the conductive part 22 and the pole 12 is located in the second receiving groove 12120, it can not only prevent the electrical connection position from protruding from the outside of the pole 12 and occupying the space outside the pole 12, but also enable the electrical connection position to be protected by the pole 12, thereby improving the reliability and stability of the electrical connection between the conductive part 22 and the pole 12.

[0216] Referring again to FIG. 20 , in some embodiments, the shape of a portion of the conductive portion 22 matches the shape of a portion of the second end wall 12121, and the conductive portion 22 is positioned to fit and electrically connect to the second end wall 12121, such that the portion where the conductive portion 22 electrically connects to the second end wall 12121 extends along the length or width of the second end wall 12121. For example, if the second end wall 12121 is planar, a portion of the conductive portion 22 can also be planar and fit to the second end wall 12121, and an electrical connection, such as welding, can be made at the fitting portion. This can increase the area of ​​the electrical connection, improving the reliability and stability of the electrical connection.

[0217] It is worth noting that the shape of the second end wall 12121 is not limited, and can be, for example, a flat plate or an arc-shaped plate structure. When the second end wall 12121 is a flat plate structure, it is arranged at an angle to the axial direction R of the pole 12. For example, it can be a flat plate structure perpendicular to the axial direction R of the pole 12, or it can be an inclined flat plate structure that is not perpendicular to the axial direction R of the pole 12, but the inclination direction is not limited.

[0218] For example, referring again to FIG. 20 , when the second end wall 12121 is a flat plate, the angle θ between the second end wall 12121 and the axial direction R of the electrode 12 is equal to 90°. That is, along the direction from the through-hole 12130 to the second side wall 12123, the second end wall 12121 is equidistant from the active material coating portion 21. This facilitates welding of the conductive portion 22 to the second end wall 12121.

[0219] For another example, the angle θ between the second end wall 12121 and the axial direction R of the pole 12 is greater than 90°, that is, along the direction from the through-hole 12130 to the second side wall 12123, the second end wall 12121 extends obliquely toward the direction close to the active material coating portion 21. As a result, the extension distance of the conductive portion 22 along the second end wall 12121 can be increased to increase the reliability of the electrical connection. Exemplarily, the angle θ between the second end wall 12121 and the axial direction R of the pole 12 can be 90°-145°, such as 100°, 110°, 120°, 130°, 140°, etc. On the one hand, this can make the second end wall 12121 easy to process and convenient for electrical connection with the conductive portion 22, and on the other hand, it can more fully utilize the space inside the pole 12 to accommodate the conductive portion 22.

[0220] For another example, the angle θ between the second end wall 12121 and the axial direction R of the pole 12 is less than 90°, that is, along the direction from the through hole 12130 to the second side wall 12123 , the second end wall 12121 extends obliquely away from the active material coating portion 21 .

[0221] As a result, the conductive portion 22 can extend a greater distance along the second end wall 12121, thereby increasing the reliability of the electrical connection. For example, the angle θ between the second end wall 12121 and the axial direction R of the pole 12 can be 45°-90°, such as 50°, 60°, 70°, 80°, etc. This can facilitate machining of the second end wall 12121 and facilitate electrical connection to the conductive portion 22. Furthermore, the space within the pole 12 can be more fully utilized to accommodate the conductive portion 22.

[0222] Of course, the present application is not limited to this. In other embodiments of the present application, the position where the conductive part 22 is electrically connected to the second end wall 12121 may not extend along the length or width direction of the second end wall 12121. It may also be a plurality of discretely arranged points. For example, the conductive part 22 has a plurality of spaced-apart parts that are respectively welded to the second end wall 12121, which will not be elaborated here.

[0223] Please refer again to Figure 20 and further to Figure 21, which is a schematic partial cross-sectional view of a battery cell 10 provided in some embodiments of the present application. Regardless of the specific value of the angle θ between the second end wall 12121 and the axial direction R of the terminal 12, in the embodiments of the present application, when the conductive portion 22 is electrically connected to the second end wall 12121, a second recess 12122 can be provided on the second end wall 12121 as required. The second recess 12122 is a groove formed by a portion of the second end wall 12121 that is recessed toward the end closest to the active material coating portion 21. The location where the conductive portion 22 is electrically connected to the second end wall 12121 is at least partially located within the second recess 12122.

[0224] In the above technical solution, the portion of the conductive part 22 located in the second groove 12122 is set to match the shape of the second groove 12122, and is fitted to achieve electrical connection. The second groove 12122 can be used to pre-position and limit the electrical connection position of the conductive part 22, which is conducive to finding the correct position to achieve electrical connection, improve production efficiency, and improve the stability and reliability of the electrical connection position, so as to improve the reliability and stability of the charging and discharging operations of the battery cell 10.

[0225] Referring again to FIG. 21 , in the embodiment of the present application, the connection method between the pole 12 and the housing 11 is not limited, and can be welding or riveting. For example, when the two are riveted, the housing 11 has a through hole 113, and the pole 12 is riveted and installed at the through hole 113. Of course, it is understood that when the two are welded or otherwise connected, the housing 11 can also have a through hole 113, and the pole 12 can be installed at the through hole 113.

[0226] Optionally, referring to Figure 20 again, the second accommodating groove 12120 can be set corresponding to the position of the through hole 113, or in other words, on the projection plane perpendicular to the axial direction R of the pole 12, the orthographic projection of the second accommodating groove 12120 is located within the orthographic projection range of the through hole 113, so that the second accommodating groove 12120 can have a larger depth to accommodate more conductive parts 22, thereby reducing the space occupied by the conductive parts 22 in the shell 11 to a greater extent.

[0227] In some embodiments, please refer to Figure 20 again. When the shell 11 has a through hole 113 and the pole 12 is installed in the through hole 113, along the axial direction R of the pole 12, the depth H3 of the second accommodating groove 12120 is greater than or equal to the minimum distance H4 from the outer end face 123 of the pole to the through hole 113.

[0228] It should be noted that the specific shape of the second receiving groove 12120 is not limited and can be regular or irregular, such as a cylindrical groove with a rectangular, elliptical, or racetrack-shaped cross-section, a trapezoidal groove with a rectangular cross-section and gradually changing cross-sectional dimensions, a hemispherical groove with a circular cross-section and gradually changing cross-sectional dimensions, or a hemispherical groove with an elliptical cross-section and gradually changing cross-sectional dimensions, etc. It is worth noting that the racetrack shape described herein refers to a shape in which the two short sides of a rectangle are replaced by convex curves.

[0229] Therefore, the depth H3 of the second receiving groove 12120 refers to the maximum depth of the second receiving groove 12120 along the axial direction R of the electrode 12. Since the depth H3 of the second receiving groove 12120 is greater than or equal to the minimum distance H4 between the electrode outer end surface 123 and the through hole 113 in the axial direction R of the electrode 12, the volume of the electrode 12 can be fully utilized, resulting in the second receiving groove 12120 having a greater depth, which is conducive to accommodating more conductive parts 22, thereby greatly reducing the space occupied by the conductive parts 22 within the housing 11, further improving the energy density of the battery cell 10, and further reducing the redundancy of the conductive parts 22 within the housing 11. At the same time, due to the greater depth of the second receiving groove 12120, it can also accommodate gassing of the electrode assembly 2, thereby improving the reliability and stability of the battery cell 10, and can also accommodate more electrolyte, thereby increasing the service life of the battery cell 10.

[0230] Please refer to Figure 21 and further to Figure 22, which is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. In the embodiments of the present application, when the accommodating portion 121 includes the second accommodating groove 12120 of any of the above-mentioned embodiments, the battery cell 10 may optionally further include a cover plate 13, which cooperates with the terminal 12 and closes the notch of the second accommodating groove 12120, and is electrically connected to the terminal 12.

[0231] In the above technical solution, by setting a cover plate 13 to close the notch of the second receiving tank 12120, the leakage of the electrolyte in the shell 11 from the notch of the second receiving tank 12120 can be reduced. Moreover, since the cover plate 13 closes the notch of the second receiving tank 12120 and is electrically connected to the pole 12, the cover plate 13 can be used to easily realize the indirect electrical connection between the pole 12 and the busbar component, and it is beneficial to increase the connection area of ​​the electrical connection, thereby helping to reduce the resistance of the electrical connection.

[0232] It is worth noting that the manner and position of engagement between the cover plate 13 and the terminal 12 are not limited, as long as the cover plate 13 can seal the notch of the second receiving slot 12120. For example, in some embodiments, the cover plate 13 can be welded to the terminal 12. During processing, the conductive portion 22 can first be passed through the through-hole 12130 and welded to the wall of the second receiving slot 12120. The cover plate 13 and the terminal 12 are then welded to seal the notch of the second receiving slot 12120.

[0233] It should also be noted that the specific composition of the cover plate 13 is not limited. For example, in some optional embodiments, referring to FIG. 22 , the cover plate 13 includes a first conductive member 131 and a second conductive member 132 made of different materials. The first conductive member 131 is engaged with and electrically connected to the pole 12, and the second conductive member 132 is engaged with and electrically connected to the first conductive member 131.

[0234] In the above technical solution, the cover plate 13 is configured as a composite structure, and the first conductive member 131 is configured to be made of the same material as the pole 12. This facilitates electrical connection between the first conductive member 131 and the pole 12. For example, welding can easily achieve a reliable and stable connection between the first conductive member 131 and the pole 12. Furthermore, because the second conductive member 132 is made of a different material than the first conductive member 131, it is convenient to use the second conductive member 132 to electrically connect to a busbar component made of a different material than the pole 12. For example, welding can easily achieve a reliable and stable connection between the second conductive member 132 and a busbar component made of the same material as the second conductive member 132.

[0235] For example, when the electrode 12 is a negative electrode 12, the electrode 12 is a copper electrode, and the current collector is an aluminum sheet, the first conductive member 131 can be set to copper, and the second conductive member 132 can be set to aluminum. In this case, the electrode 12 and the first conductive member 131 are made of the same material and can be effectively welded, and the second conductive member 132 and the current collector are made of the same material and can be effectively welded, thereby effectively achieving an indirect electrical connection between the electrode 12 and the current collector through the cover 13. Moreover, the copper-to-copper welding of the electrode 12 and the first conductive member 131 has good fluidity and is less likely to crack, which helps to improve the sealing effect of the weld.

[0236] Referring again to FIG. 22 , in some optional examples, the first conductive member 131 is located between the second receiving groove 12120 and the second conductive member 132. In the above technical solution, since the first conductive member 131 is located between the second receiving groove 12120 and the second conductive member 132, it can separate the second receiving groove 12120 from the second conductive member 132. Therefore, when the electrolyte in the housing 11 enters the second receiving groove 12120 through the through-hole 12130, the first conductive member 131 can reduce the contact between the electrolyte and the second conductive member 132, thereby solving the problem of electrolyte corrosion on the second conductive member 132.

[0237] It is worth noting that the coupling method between the first conductive member 131 and the second conductive member 132 is not limited. For example, in some embodiments, referring to FIG. 22 , the first conductive member 131 has a second groove 1311, and the second conductive member 132 is embedded in the second groove 1311. The notch of the second groove 1311 is formed on the surface of the first conductive member 131 away from the second receiving slot 12120, so that the second conductive member 132 is exposed through the notch of the second groove 1311. Alternatively, in other embodiments, the connection method between the first conductive member 131 and the second conductive member 132 can also be a fastening connection, a snap connection, etc.

[0238] It should also be noted that the "exposed" of the second conductive member 132 by the notch of the second groove 1311 means that the first conductive member 131 does not block the second conductive member 132 at the notch position of the second groove 1311, and the second conductive member 132 is not required to protrude from the notch of the second groove 1311. For example, the second conductive member 132 can be flush with the surface of the first conductive member 131 on the side away from the second accommodating groove 12120, or the second conductive member 132 can protrude from the surface of the first conductive member 131 on the side away from the second accommodating groove 12120.

[0239] In the above technical solution, on the one hand, by embedding the second conductive member 132 within the first conductive member 131, the difficulty of assembling the first and second conductive members 131, 132 can be reduced, the stability and convenience of the cooperation between the first and second conductive members 131, 132 can be improved, and the thickness of the cover plate 13 can be reduced, reducing the space occupied by the cover plate 13, thereby improving the space utilization of the battery cell 10. On the other hand, because the second conductive member 132 can be exposed from the surface of the first conductive member 131 away from the second receiving groove 12120 through the notch of the second groove 1311, it is convenient to achieve electrical connection between the second conductive member 132 and the current collecting component outside the terminal 12.

[0240] In addition, since the notch of the second groove 1311 is formed on the surface of the first conductive member 131 on the side away from the second receiving groove 12120, it means that the second groove 1311 is open in the direction away from the active material coating portion 21, so that the portion of the groove wall of the first conductive member 131 used to define the second groove 1311 is located between the second receiving groove 12120 and the second conductive member 132 to separate the second receiving groove 12120 and the second conductive member 132, thereby preventing the electrolyte entering the second groove 1311 from contacting the second conductive member 132, thereby reducing leakage of the electrolyte.

[0241] Of course, in other embodiments, the cover plate 13 may not be a composite form composed of multiple materials. For example, in other embodiments of the present application, the cover plate 13 as a whole may be set to a non-composite form made of the same material, such as for adapting to the positive electrode column 12, which will not be elaborated here.

[0242] Referring again to Figure 22 , the cover plate 13 is further embedded in the notch of the second receiving groove 12120. In the above technical solution, by embedding the cover plate 13 in the second receiving groove 12120, the difficulty of assembling the cover plate 13 and the terminal 12 can be reduced, the assembly stability of the cover plate 13 and the terminal 12 can be improved, as well as the reliability and convenience of the connection. It can also reduce the space occupied by the cover plate 13 outside the terminal 12. Moreover, because the cover plate 13 is embedded in the notch of the second receiving groove 12120, there is sufficient space in the second receiving groove 12120 to accommodate the conductive portion 22.

[0243] Of course, in other embodiments of the present application, the cooperation manner of the cover plate 13 and the pole 12 is not limited to being embedded in the second receiving groove 12120. The cover plate 13 can also be directly covered on the outside of the pole 12, that is, directly covered at the notch of the second receiving groove 12120, so as to facilitate cooperation with the convergence component of the battery 100. This is not limited in this embodiment.

[0244] According to some embodiments of the present application, the present application further provides a battery 100 including the battery cell 10 of the above solution.

[0245] In the technical solution of the embodiment of the present application, the pole 12 is arranged on the mounting wall 114 of the shell body 111, and the pole 12 is used to increase the structural strength of the mounting wall 114, so that the mounting wall 114 is not easily deformed, thereby enhancing the protective effect of the shell body 111 on the electrode assembly 2, and facilitating the control of the consistency of the bursting pressure of the explosion-proof valve 6.

[0246] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery 100 of the above solution, and the battery 100 is used to provide power to the electrical device. The electrical device can be any of the above-mentioned devices or systems using the battery.

[0247] According to some embodiments of the present application, a shell body assembly 101 is provided, which includes a shell body 111, an explosion-proof valve 6 and a pole 12. The shell body 111 has an opening 1110 and includes a mounting wall 114. The mounting wall 114 is located on the wall of the shell body 111 opposite to the opening 1110. The mounting wall 114 is penetrated by a mounting hole 115 and a through hole 113. The explosion-proof valve 6 is arranged at the mounting hole 115 and connected to the mounting wall 114. The pole 12 is arranged at the through hole 113 and connected to the mounting wall 114.

[0248] The outer peripheral wall of the terminal 12 has an annular groove 128 extending along its circumference. The annular groove 128 cooperates with the edge of the through hole 113 to secure the terminal 12 in the through hole 113, preventing the terminal 12 from falling off the mounting wall 114. At the same time, the annular groove 128 cooperates with the edge of the through hole 113 to restrict the movement of the terminal 12, thereby reducing the possibility of collision between the terminal 12 and the edge of the through hole 113. This allows the terminal 12 to be more stably electrically connected to the battery cell 10, allowing the terminal 12 to more stably output the electrical energy within the battery cell 10 to the external circuit. By stably securing the terminal 12 in the through hole 113 on the mounting wall 114, even if the pressure inside the battery cell 10 is high and one side of the terminal 12 is subjected to pressure, the terminal 12 is unlikely to fall off the mounting wall 114, thereby stably reinforcing the structural strength of the mounting wall 114.

[0249] The depth of the mounting hole 115 extends in the up-down direction. The mounting hole 115 includes, from top to bottom, a fourth hole section 1154, a third hole section 1153, a first hole section 1151, and a second hole section 1152. The apertures of the fourth hole section 1154, the third hole section 1153, the first hole section 1151, and the second hole section 1152 decrease in sequence and define a third step surface 1163, a second step surface 1162, and a first step surface 1161 in sequence. The explosion-proof valve 6 is supported on the first step surface 1161, and the explosion-proof valve 6 is located in the first hole section 1151. The protective sheet 14 is supported on the second step surface 1162, and the protective sheet 14 is located in the fourth hole section 1154.

[0250] The second hole section 1152 separates the first hole section 1151 from the space inside the shell body 111. In this way, after the explosion-proof valve 6 is set on the first step surface 1161, there is at least the first hole section 1151 between the explosion-proof valve 6 and the components inside the shell body 111. In this way, when the air pressure inside the battery cell 10 increases, the gas can converge at the first hole section 1151. The gas can directly apply pressure to the explosion-proof valve 6 from the first hole section 1151. When the air pressure inside the battery cell 10 is higher than the critical value, the air pressure can destroy the explosion-proof valve 6, thereby achieving pressure relief of the battery cell 10.

[0251] The third hole section 1153 is used to reserve space for the weld formed when the explosion-proof valve 6 and the second hole are welded together. When the explosion-proof valve 6 is welded to the mounting wall 114, the weld formed will protrude from the explosion-proof valve 6. The third hole section 1153 can reserve space for the weld, so that when the components are set on the mounting wall 114, the possibility of scratches between the components and the weld can be reduced, so as to protect the components and the weld, so that the weld can stably connect the explosion-proof valve 6 and the mounting wall 114, so as to stably fix the explosion-proof valve 6 on the mounting wall 114.

[0252] The through holes 113 and the mounting holes 115 are arranged at intervals along the length direction of the mounting wall 114, and the poles 12 and the explosion-proof valve 6 are arranged at intervals in the opposite direction along the length of the mounting wall 114. The mounting wall 114 is provided with two through holes 113 and one mounting hole 115. The mounting hole 115 is located between the two through holes 113. The two poles 12 are arranged in the through holes 113 in a one-to-one correspondence. That is, the two poles 12 are located on both sides of the explosion-proof valve 6. The two poles 12 can be both positive poles 1201 or negative poles 1202, or one can be a positive pole 1201 and the other can be a negative pole 1202.

[0253] The two poles 12 are located on both sides of the mounting hole 115 to strengthen the structural strength of the area near the mounting hole 115 on the mounting wall 114 from both sides of the mounting hole 115, thereby fully reducing the impact of the mounting hole 115 on the structural strength of the mounting wall 114 and strengthening the structural strength of the mounting wall 114.

[0254] The distance between the edge of the through hole 113 and the edge of the mounting hole 115 where they are close to each other is 1mm-30mm. Within this range, the mounting hole 115 and the through hole 113 will not be connected. There is a solid area of ​​at least 1mm between the mounting hole 115 and the through hole 113 to reserve a press-fitting area for stamping processing, thereby facilitating the processing and formation of the through hole 113 and the mounting hole 115 on the mounting wall 114.

[0255] The distance between the edge of the through hole 113 and the edge of the mounting hole 115 where they are close to each other is 1 mm to 30 mm, and the mounting hole 115 is not far away from the through hole 113. By reducing the distance between the mounting hole 115 and the through hole 113, after the pole 12 is arranged at the through hole 113, the pole 12 can enhance the structural strength of the area near the through hole 113 on the mounting wall 114. Since the through hole 113 and the mounting hole 115 are not far away, after the pole 12 is arranged on the mounting wall 114, the pole 12 can reduce the impact of the mounting hole 115 on the structural strength of the mounting wall 114, thereby fully enhancing the overall structural strength of the mounting wall 114.

[0256] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell housing assembly, wherein: include: The shell body has an opening, and the shell body includes a mounting wall through which a mounting hole is formed; An explosion-proof valve, arranged at the mounting hole and connected to the mounting wall; The pole is arranged on the installation wall and spaced apart from the installation hole.

2. The battery cell housing assembly according to claim 1, wherein: The installation wall is penetrated by a through hole, and the pole is arranged at the through hole and connected to the installation wall.

3. The battery cell housing assembly according to claim 2, wherein: The outer peripheral wall of the pole has an annular groove extending along its circumference, and the annular groove matches with the edge of the through hole.

4. The battery cell shell assembly according to claim 2 or 3, wherein: The minimum distance between the edge of the through hole and the edge of the mounting hole is 1 mm-30 mm.

5. The battery cell shell assembly according to any one of claims 1 to 4, wherein: The mounting hole comprises a first hole segment and a second hole segment which are arranged in the thickness direction of the mounting wall and are connected, and the second hole segment is closer to the inner cavity of the shell body relative to the first hole segment; Wherein, a first step surface is formed between the first hole section and the second hole section, and the explosion-proof valve is arranged in the first hole section and cooperates with the first step surface.

6. The battery cell housing assembly according to claim 5, wherein: The mounting hole also includes a third hole section, which is connected to an end of the first hole section away from the second hole section, and a second step surface is formed between the first hole section and the third hole section. The explosion-proof valve is welded to the mounting wall to form a weld, and the third hole section is used to accommodate the weld.

7. The battery cell housing assembly according to claim 6, wherein: Also includes: A protection sheet is provided on a side of the explosion-proof valve away from the second hole section, and is used for covering the explosion-proof valve.

8. The battery cell housing assembly according to claim 7, wherein: The mounting hole also includes a fourth hole segment, the fourth hole segment is connected to an end of the third hole segment away from the first hole segment, a third step surface is formed between the fourth hole segment and the third hole segment, and the protective sheet is arranged in the fourth hole segment and cooperates with the third step surface.

9. The battery cell housing assembly according to claim 7, wherein: An exhaust groove is provided on a side of the installation wall away from the inner cavity of the shell body, the exhaust groove is communicated with the installation hole, and the protective sheet covers a part of the exhaust groove.

10. The battery cell housing assembly according to claim 9, wherein: The cross-sectional shape of the exhaust groove is square, trapezoidal or triangular.

11. The battery cell shell assembly according to any one of claims 1 to 10, wherein: The explosion-proof valve is an integrally formed part and has a thickness-reduced portion; or, the explosion-proof valve is a split structure.

12. The battery cell shell assembly according to any one of claims 1 to 11, wherein: The installation wall is provided with a pole, and the pole and the explosion-proof valve are arranged at intervals in the length direction of the installation wall.

13. The battery cell shell assembly according to any one of claims 1 to 11, wherein: At least two poles are arranged on the installation wall, and the at least two poles are arranged at intervals in the length direction of the installation wall, and the explosion-proof valve is located between the two poles.

14. The battery cell shell assembly according to any one of claims 1 to 13, wherein: The installation wall is located on a wall of the shell body opposite to the opening.

15. A battery cell, wherein: include: A shell body component, wherein the shell body component is a shell body component of a battery cell according to any one of claims 1 to 14; An electrode assembly, the electrode assembly is disposed in the shell body and comprises an active material coating portion and a conductive portion connected to the active material coating portion, the conductive portion being electrically connected to the pole; A shell cover is covered on the opening to seal the electrode assembly in the shell body.

16. The battery cell according to claim 15, wherein: The installation wall is located on a wall of the shell body opposite to the opening, the pole is provided with a receiving portion, and at least a portion of the conductive portion extends into the receiving portion.

17. The battery cell according to claim 16, wherein: The accommodating portion includes a first accommodating groove, the surface of the pole facing the active material coating portion is the inner end face of the pole, the notch of the first accommodating groove is formed on the inner end face of the pole, and at least part of the conductive portion is accommodated in the first accommodating groove.

18. The battery cell according to claim 16, wherein: The accommodating portion includes a second accommodating groove, the surface of the pole away from the active material coating portion is the outer end face of the pole, the notch of the second accommodating groove is formed on the outer end face of the pole, the second accommodating groove is connected to the inner cavity of the shell body through a through hole, the conductive portion is passed through the through hole and is at least partially accommodated in the second accommodating groove.

19. A battery, wherein: The invention comprises a battery cell according to any one of claims 15 to 18.

20. An electrical device, wherein: Comprising a battery according to claim 19.

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