Battery cell and battery having same, and electric device

Abstract

A battery cell and a battery having same, and an electric device. The battery cell comprises: a housing, which comprises a mounting wall; an electrode assembly, which is arranged in the housing; an explosion-proof valve, which is arranged on the mounting wall; and an air guide part, which comprises an air guide groove formed in the mounting wall, wherein the air guide groove is configured to guide to the explosion-proof valve a gas generated by the electrode assembly. In the technical solutions of the embodiments of the present application, the air in the housing can be guided to flow to the explosion-proof valve, and by means of providing the air guide groove in the mounting wall, an increase in the exhaust efficiency of the battery cell is facilitated, thus increasing the pressure relief efficiency of the battery cell. Compared with the separate provision of an air guide assembly in the battery cell, providing the air guide groove in the mounting wall to form the air guide part facilitates a reduction in the space in the battery cell that is occupied by the air guide part.

Description

Battery cell, battery and electrical device having the same

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202311309420.3 and application date October 10, 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 and a battery and an electrical device having the battery cell. 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 sustainable development. Battery technology is a crucial factor in the development of electric vehicles. In related technologies, battery cells experience slow pressure release when thermal runaway occurs.

[0005] Summary of the Invention

[0006] In view of the above problems, the present application provides a battery cell and a battery and an electrical device having the same. By arranging an air guide groove on the mounting wall, the air guide groove can guide the air in the shell to flow to the explosion-proof valve, thereby improving the exhaust efficiency of the battery cell and realizing rapid pressure relief of the battery cell. Compared with separately arranging an air guide component inside the battery cell, an air guide groove is opened on the mounting wall to form an air guide part, which facilitates reducing the space occupied by the air guide part in the battery cell.

[0007] In the first aspect, the present application provides a battery cell, comprising: a shell including a mounting wall; an electrode assembly arranged in the shell; an explosion-proof valve arranged on the mounting wall; and an air guide portion including an air guide groove opened on the mounting wall, the air guide groove being used to guide the gas generated by the electrode assembly to the explosion-proof valve.

[0008] In the technical solution of the embodiment of the present application, the gas guide groove and the explosion-proof valve are both arranged on the mounting wall, so that the gas guide groove is arranged near the explosion-proof valve, so that the gas guide groove can conveniently and quickly guide the gas to the vicinity of the explosion-proof valve, and then when the gas inside the battery cell reaches a critical value, the gas can quickly gather near the explosion-proof valve and break through the explosion-proof valve to achieve rapid pressure relief of the battery cell. Compared with separately setting a gas guide component inside the battery cell, opening a gas guide groove on the mounting wall to form a gas guide part is convenient for reducing the space occupied by the gas guide part in the battery cell.

[0009] In some embodiments, the explosion-proof valve includes a pressure relief groove formed in the mounting wall. In the above technical solution, by providing the pressure relief groove on the mounting wall, a wall surface with lower structural strength can be formed on the mounting wall. When the gas pressure inside the battery cell reaches a critical value, the gas will preferentially break through the wall surface with lower structural strength on the mounting wall, thereby destroying the explosion-proof valve, connecting the interior of the battery cell with the external environment, allowing the gas inside the battery cell to enter the external environment, and achieving pressure relief for the battery cell.

[0010] In some embodiments, the depth of the gas guide groove is less than the depth of the pressure relief groove. In the above technical solution, when the gas pressure in the battery cell reaches a critical value, the gas preferentially breaks through the wall portion of the mounting wall opposite the pressure relief groove, thereby reducing the possibility of gas breaking through the wall portion of the mounting wall opposite the gas guide groove and reducing the impact of the gas guide groove on the explosion-proof valve.

[0011] In some embodiments, the gas guide groove and the pressure relief groove are both provided on the side of the mounting wall facing the inner cavity of the housing. In the above technical solution, the gas guide groove and the pressure relief groove are located on the same side. The gas guide groove can guide the gas into the pressure relief groove, so that the gas is evenly distributed in the pressure relief groove, and then the gas is evenly concentrated at the explosion-proof valve. When the gas pressure in the battery cell reaches a critical value, the gas breaks through the explosion-proof valve to form a larger opening, thereby facilitating rapid pressure relief of the battery cell.

[0012] In some embodiments, the air guide groove is provided on the side of the mounting wall facing the inner cavity of the housing, and the pressure relief groove is provided on the side of the mounting wall facing away from the inner cavity of the housing. In the above technical solution, the side of the mounting wall facing away from the inner cavity of the housing is located on the outer side of the housing, so that the position of the pressure relief groove on the housing is easily identified, thereby facilitating the identification of the position of the explosion-proof valve. In this way, when installing the battery cell, the relative position of the battery cell can be conveniently determined by using the position of the explosion-proof valve.

[0013] In some embodiments, the gas guide groove and the pressure relief groove are spaced apart. In the above technical solution, this allows the wall thickness of the portion of the mounting wall located between the gas guide groove and the pressure relief groove to remain unchanged, thereby ensuring the structural strength of the mounting wall, thereby reducing the possibility of deformation of the mounting wall and allowing the gas guide groove on the mounting wall to smoothly guide gas to the pressure relief groove.

[0014] In some embodiments, the gas guide groove is connected to the pressure relief groove. In the above technical solution, the gas can flow directly into the pressure relief groove along the gas guide groove, which can improve the gas guide efficiency and achieve rapid pressure relief of the battery cell.

[0015] In some embodiments, the pressure relief groove includes a first pressure relief groove section and a second pressure relief groove section arranged in a cross pattern. In the above technical solution, this facilitates the connection between the first pressure relief groove section and the second pressure relief groove section, while also facilitating the increase in the area of ​​the explosion-proof valve, allowing the gas to be evenly distributed within the first and second pressure relief groove sections. When the gas pressure within the battery cell reaches a critical value, the gas breaks through the explosion-proof valve to form a larger opening, thereby facilitating rapid pressure relief of the battery cell.

[0016] In some embodiments, the first pressure relief trough section extends along the length of the mounting wall, and the second pressure relief trough section extends along the width of the mounting wall. In the above technical solution, the angle formed between the first pressure relief trough section and the second pressure relief trough section is 90°, which facilitates reducing the resistance encountered by gas when flowing between the first pressure relief trough section and the second pressure relief trough section, thereby allowing the gas to be quickly and evenly distributed within the first pressure relief trough section and the second pressure relief trough section.

[0017] In some embodiments, the gas guide groove and the explosion-proof valve are arranged along the length of the mounting wall, and the gas guide groove includes a first gas guide groove segment extending along the length of the mounting wall. In the above technical solution, gas can flow along the first gas guide groove segment from one end along the length of the mounting wall toward the explosion-proof valve, thereby directing gas from the end of the battery cell farther from the explosion-proof valve toward the explosion-proof valve, allowing the gas to accumulate at the explosion-proof valve.

[0018] In some embodiments, the first air guide groove segments are multiple in number, and the multiple first air guide groove segments are spaced apart in the width direction of the mounting wall. In the above technical solution, this facilitates increasing the air guide range of the air guide groove, thereby increasing the air guide efficiency of the air guide groove, enabling the air guide groove to quickly guide the gas to the pressure relief groove, thereby facilitating an increased pressure relief speed.

[0019] In some embodiments, in each of the gas guide grooves, the distance between any two adjacent first gas guide groove segments is equal. In the above technical solution, the multiple first gas guide groove segments can uniformly guide the gas generated by the electrode assembly, and further uniformly guide the gas to the explosion-proof valve.

[0020] In some embodiments, in each of the gas guide grooves, the distance between at least two adjacent first gas guide groove segments is unequal to the distance between another two adjacent first gas guide groove segments. In the above technical solution, in some cases, a large amount of gas may be generated in certain areas within the battery cell. Therefore, densely arranging the multiple first gas guide segments in corresponding areas of the mounting wall along the width of the mounting wall can increase the efficiency of gas diversion in these areas, thereby smoothly directing the gas to the explosion-proof valve.

[0021] In some embodiments, the gas guide groove further includes a second gas guide groove segment extending along the width of the mounting wall, wherein one end of the first gas guide groove segment, distal from the explosion-proof valve, is connected to the second gas guide groove segment and the other end extends toward the explosion-proof valve. In the above technical solution, the provision of the second gas guide groove segment facilitates increasing the volume of the gas guide groove, allowing the gas guide groove to accommodate more gas, thereby facilitating improved gas diversion efficiency. Gas in the second gas guide groove can enter the first gas guide groove and flow along the first gas guide groove toward the explosion-proof valve.

[0022] In some embodiments, the gas guides include two gas guides spaced apart along the length of the mounting wall, with the explosion-proof valve located between the two gas guides. In the above technical solution, this allows gas at both ends of the explosion-proof valve to flow along the corresponding gas guide grooves toward the explosion-proof valve, thereby improving gas conduction efficiency and increasing the pressure relief speed of the battery cells.

[0023] In some embodiments, the explosion-proof valve is located at the center of the mounting wall along its length, and the two air guides have identical structures and are symmetrically arranged about the center of the explosion-proof valve. In the above technical solution, the two air guides can evenly direct gas from both sides of the explosion-proof valve toward the explosion-proof valve, thereby reducing the possibility of airflow blockage within the air guide channel, thereby improving air guidance efficiency and enhancing the pressure relief efficiency of the battery cells.

[0024] In some embodiments, the mounting wall has a first end and a second end disposed opposite each other along its length, and the distance between the explosion-proof valve and the first end is greater than the distance between the explosion-proof valve and the second end; wherein the area of ​​the air guide portion between the explosion-proof valve and the first end is greater than the area of ​​the air guide portion between the explosion-proof valve and the second end. In the above technical solution, this facilitates adaptively increasing the area of ​​the air guide portion in a portion of the mounting wall, thereby improving the flow guidance efficiency in this portion to accommodate the situation where a certain area within the battery cell has a large amount of gas.

[0025] In some embodiments, the housing includes a cover and a body having an opening, the cover covering the opening, and the mounting wall being located on the cover or the body. In the above technical solution, when the gas within the battery cell reaches a critical value, the gas can break through the explosion-proof valve on the mounting wall, thereby achieving pressure relief for the battery cell.

[0026] In some embodiments, the shell includes a shell cover and a shell body with an opening, the shell cover is closed to the opening, the mounting wall is located on the shell cover, and a pole is provided on the wall of the shell body opposite to the mounting wall, and the pole is provided with a receiving portion; the electrode assembly includes an active material coating portion and a conductive portion connected to the active material coating portion, and at least a portion of the conductive portion extends into the receiving portion and is connected to the pole. In the above technical solution, by accommodating at least a portion of the conductive portion in the receiving portion, the space occupied by the battery cell itself can be reduced, so that a battery of the same volume can accommodate more battery cells and the volume energy density of the battery can be improved; in addition, accommodating at least a portion of the conductive portion in the receiving portion to occupy the space in the pole can reduce the redundancy of the conductive portion in the shell to at least a certain extent, reduce the probability of short circuit between the conductive portion and the active material coating portion, reduce the probability of short circuit of the battery cell, and improve the working reliability and stability of the battery cell and the battery.

[0027] 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. In the above technical solution, on the one hand, the opening of the first accommodating groove on the pole 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, because the notch of the first accommodating groove is formed on the inner end face of the pole, and the inner end face of the pole is the surface of the pole close to the active material coating portion, the first accommodating groove can be opened in the direction of the active material coating portion, thereby facilitating the conductive portion to extend into the first accommodating groove, thereby improving assembly efficiency. Moreover, this form of first accommodating groove is easy to process and improves production efficiency.

[0028] In some embodiments, the receiving portion includes a second receiving groove, wherein the surface of the terminal distal to the active material coating portion is the terminal outer end surface, and a notch of the second receiving groove is formed on the terminal outer end surface. The second receiving groove communicates with the interior of the housing via a through-hole, and the conductive portion is passed through the through-hole and at least partially received within the second receiving groove. In the above technical solution, on the one hand, the provision of the second receiving groove on 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 second receiving groove is formed on the terminal outer end surface, which is the surface of the terminal distal to the active material coating portion, the second receiving groove can be open in a direction away from the active material coating portion. Thus, when at least a portion of the conductive portion is received within the second receiving groove, the conductive portion can be easily stored and organized through the notch of the second receiving groove, and electrical connection operations between the conductive portion and the terminal can be easily performed through the notch of the second receiving groove, thereby reducing the difficulty of battery cell production and improving battery cell production efficiency.

[0029] In a second aspect, the present application provides a battery comprising a battery cell according to the above-described embodiment. By providing an air guide groove on the mounting wall, the air guide groove can guide the air within the housing to flow toward the explosion-proof valve, thereby improving the exhaust efficiency of the battery cell and achieving rapid pressure relief of the battery cell. Compared to providing a separate air guide component within the battery cell, providing an air guide groove on the mounting wall to form an air guide portion can reduce the space occupied by the air guide portion within the battery cell.

[0030] In a third aspect, the present application provides an electrical device comprising the battery of the aforementioned embodiment. By providing an air guide groove on the mounting wall, the air guide groove can guide the air within the housing toward the explosion-proof valve, thereby improving the exhaust efficiency of the battery cell and achieving rapid pressure relief of the battery cell. Compared to providing a separate air guide component within the battery cell, providing an air guide groove on the mounting wall to form an air guide portion reduces the space occupied by the air guide portion within the battery cell.

[0031] 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

[0032] 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:

[0033] FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0034] FIG2 is an exploded view of a battery according to some embodiments of the present application;

[0035] FIG3 is a schematic structural diagram of a battery cell according to some embodiments of the present application;

[0036] FIG4 is a cross-sectional view of a battery cell according to some embodiments of the present application;

[0037] FIG5 is an exploded view of the structure of a battery cell according to some embodiments of the present application;

[0038] FIG6 is a schematic structural diagram of a battery cell according to some embodiments of the present application;

[0039] FIG7 is a schematic structural diagram of a mounting wall according to some embodiments of the present application;

[0040] FIG8 is a schematic structural diagram of a mounting wall according to some embodiments of the present application;

[0041] FIG9 is a cross-sectional view of the section AA in FIG8 ;

[0042] FIG10 is an enlarged view of a portion of the area in FIG9 ;

[0043] FIG11 is a schematic structural diagram of a mounting wall according to some embodiments of the present application;

[0044] FIG12 is a schematic structural diagram of a mounting wall according to some embodiments of the present application;

[0045] FIG13 is a schematic structural diagram of a mounting wall according to some embodiments of the present application;

[0046] FIG14 is a schematic structural diagram of a mounting wall according to some embodiments of the present application;

[0047] FIG15 is a schematic structural diagram of a battery cell according to some embodiments of the present application;

[0048] FIG16 is a cross-sectional view at BB in FIG15 ;

[0049] FIG17 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0050] FIG18 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0051] FIG19 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0052] FIG20 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0053] FIG21 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0054] FIG22 is a schematic partial cross-sectional view of a battery cell provided in some embodiments of the present application.

[0055] Reference numerals: vehicle 1000;

[0056] Battery 100, controller 200, motor 300;

[0057] Battery cell 10;

[0058] Housing 11, housing body 111, opening 1110, housing cover 112, through hole 113, mounting wall 114, first wall portion 1143, second wall portion 1144, mounting hole 115;

[0059] 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;

[0060] Cover plate 13, first conductive member 131, second groove 1311, second conductive member 132;

[0061] Box body 20, first part 201, second part 202;

[0062] Electrode assembly 2, active material coating portion 21, conductive portion 22;

[0063] Bracket 3, through hole 314, insulating member 4, explosion-proof valve 6, pressure relief groove 60, first pressure relief groove section 61, second pressure relief groove section 62, groove cover 7, air guide portion 80, air guide groove 81, first air guide groove section 811, second air guide groove section 812. DETAILED DESCRIPTION

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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).

[0070] 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.

[0071] 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.

[0072] 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.

[0073] Battery cells are typically equipped with explosion-proof valves, which are used to release internal pressure when the internal pressure or temperature of the battery cell reaches a threshold. In related art, the gas inside the battery cell takes a long time to flow to the explosion-proof valve and be discharged through it, thus relieving the pressure of the battery cell. This means that the pressure relief of the battery cell is slow and takes a long time.

[0074] In order to increase the pressure relief speed of the battery cell, the present application sets an air guide groove near the explosion-proof valve, and uses the air guide groove to guide the gas in the battery cell so that the gas in the battery cell can flow along the air guide groove to the explosion-proof valve. This makes it easier for the gas to be discharged from the explosion-proof valve in an orderly manner, thereby facilitating the exhaust speed of the battery cell and increasing the pressure relief speed of the battery cell.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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 11 is 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.

[0086] 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.

[0087] 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.

[0088] 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 main body of the electrode assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0089] 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.

[0090] Please refer to Figures 5 and 6. Figure 5 is an exploded view of the structure of a battery cell 10 according to some embodiments of the present application, and Figure 6 is a schematic diagram of the structure of a battery cell 10 according to some embodiments of the present application. This application provides a battery cell 10. The battery cell 10 includes a housing 11, which includes a mounting wall 114. The mounting wall 114 is a wall of the housing 11.

[0091] The battery cell 10 also includes an electrode assembly 2, an explosion-proof valve 6 and an air guide portion 80. The electrode assembly 2 is arranged in the shell 11, the explosion-proof valve 6 is arranged on the installation wall 114, and the air guide portion 80 includes an air guide groove 81. The air guide groove 81 is opened on the installation wall 114, and the air guide groove 81 is used to guide the gas generated by the electrode assembly 2 to the explosion-proof valve 6.

[0092] The electrode assembly 2 is the component in the battery cell 10 where electrochemical reactions occur. During the charge and discharge process of the battery, the active material coating portion 21 in the electrode assembly 2 reacts with the electrolyte and produces gas. When thermal runaway occurs in the battery cell 10, the gas expands due to heat, causing the gas pressure inside the battery cell 10 to increase.

[0093] The explosion-proof valve 6 is provided on the mounting wall 114. When the pressure inside the battery cell 10 is higher than 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 11 is connected to the external environment to achieve pressure relief of the battery cell 10. The provision of the explosion-proof valve 6 can improve the safety of the use of the battery cell 10 and reduce the possibility of explosion of the battery cell 10.

[0094] The gas guide groove 81 is opened on the installation wall 114. By performing laser cutting or CNC stamping on the installation wall 114, the gas guide groove 81 can be formed on the installation wall 114 to form a space for accommodating gas on the installation wall 114. At the same time, when the internal pressure of the battery cell 10 is relatively large, under the action of air pressure, the gas guide groove 81 can guide the gas generated by the electrode assembly 2 to the explosion-proof valve 6 to gather the gas at the explosion-proof valve 6. Then, when the air pressure in the battery cell 10 reaches the critical value, the air pressure in the battery cell 10 can quickly flow to the explosion-proof valve 6 and break through the explosion-proof valve 6 to achieve rapid pressure relief of the battery cell 10.

[0095] Among them, the gas guide groove 81 and the explosion-proof valve 6 are both arranged on the installation wall 114, so that the gas guide groove 81 is set near the explosion-proof valve 6, so that the gas guide groove 81 can conveniently and quickly guide the gas to the vicinity of the explosion-proof valve 6, and then when the gas inside the battery cell 10 reaches the critical value, the gas can quickly gather at the explosion-proof valve 6 and break through the explosion-proof valve 6 to achieve rapid pressure relief of the battery cell 10.

[0096] In addition, compared to setting up a separate air guide component inside the battery cell 10, an air guide groove 81 is opened on the installation wall 114 to form an air guide portion 80, which is convenient for reducing the space occupied by the air guide portion 80 in the battery cell 10, and reserving a larger space for the electrode assembly 2, thereby facilitating the increase of the capacity of the battery cell 10.

[0097] Please continue to refer to FIG. 6 and further refer to FIG. 7 . FIG. 7 is a structural diagram of the installation wall 114 in some embodiments of the present application. The explosion-proof valve 6 includes a pressure relief groove 60 provided in the installation wall 114 .

[0098] By performing laser cutting or CNC stamping on the mounting wall 114 , a pressure relief groove 60 can be formed on the mounting wall 114 . The wall surface of the mounting wall 114 opposite to the pressure relief groove 60 is thinner, and the structural strength of this area is lower. When the air pressure in the battery cell 10 reaches a critical value, the gas will preferentially break through the thinner wall surface of the mounting wall 114 .

[0099] When the air pressure inside the battery cell 10 reaches a critical value, the gas will preferentially break through the wall surface of the mounting wall 114 with lower structural strength, that is, break through the wall surface of the mounting wall 114 opposite to the pressure relief groove 60, and then destroy the explosion-proof valve 6, so that the interior of the battery cell 10 is connected to the external environment, thereby achieving pressure relief of the battery cell 10.

[0100] Please refer to Figures 8, 9 and 10. Figure 8 is a structural schematic diagram of the mounting wall 114 of some embodiments of the present application, Figure 9 is a cross-sectional view at AA in Figure 8, and Figure 10 is an enlarged view of a partial area in Figure 9. The depth H1 of the air guide groove 81 is less than the depth H2 of the pressure relief groove 60.

[0101] The thickness of the mounting wall 114 is H, and the thickness of the mounting wall 114 extends along the Z direction. The depth of the air guide groove 81 and the pressure relief groove 60 also extends along the Z direction. The mounting wall 114 includes a first wall portion 1143 and a second wall portion 1144. After the air guide groove 81 is provided on the mounting wall 114, the wall portion of the mounting wall 114 that opposes the air guide groove 81 in the Z direction becomes the first wall portion 1143. After the pressure relief groove 60 is provided on the mounting wall 114, the wall portion of the mounting wall 114 that opposes the pressure relief groove 60 in the Z direction becomes the second wall portion 1144. The second wall portion 1144 forms the explosion-proof valve 6.

[0102] Among them, the thickness of the first wall portion 1143 is H-H1, and the thickness of the second wall portion 1144 is H-H2, so that the depth H1 of the air guide groove 81 is less than the depth H2 of the pressure relief groove 60, so as to control the thickness of the first wall portion 1143 to be greater than the thickness of the second wall portion 1144, and thus make the structural strength of the first wall portion 1143 greater than the structural strength of the second wall portion 1144. In this way, when the air pressure in the battery cell 10 reaches the critical value, the gas will first break through the second wall portion 1144, that is, first destroy the explosion-proof valve 6.

[0103] Specifically, after determining the critical value of the battery cell 10, it is only necessary to control the thickness, material, etc. of the second wall portion 1144 so that when the air pressure in the battery cell 10 reaches the critical value, it can break through the second wall portion 1144, and make the depth H1 of the gas guide groove 81 smaller than the depth H2 of the pressure relief groove 60, that is, make the thickness of the first wall portion 1143 greater than the thickness of the second wall portion 1144, so as to reduce the possibility of the gas in the battery cell 10 breaking through the first wall portion 1143.

[0104] Please continue to refer to Figure 8 and further refer to Figure 11. Figure 11 is a structural schematic diagram of the installation wall 114 of some embodiments of the present application. The air guide groove 81 and the pressure relief groove 60 are both arranged on the side of the installation wall 114 facing the inner cavity of the shell 11.

[0105] The gas guide groove 81 is used to guide the gas generated by the electrode assembly 2 to the pressure relief groove 60, so that the gas guide groove 81 and the pressure relief groove 60 are located on the same side, so that the gas guide groove 81 can evenly guide the gas to the pressure relief groove 60, so that the gas can be evenly distributed in the pressure relief groove 60, and then the gas is evenly gathered at the explosion-proof valve 6, so that when the air pressure in the battery cell 10 reaches a critical value, the gas can form a larger opening 1110 when breaking through the explosion-proof valve 6, thereby facilitating the rapid pressure relief of the battery cell 10.

[0106] In which, please continue to refer to Figures 9 and 10. The thickness direction of the mounting wall 114 extends in the up-down direction. In the up-down direction, the opening 1110 of the air guide groove 81 and the opening 1110 of the pressure relief groove 60 are facing the top of the mounting wall 114. A first wall portion 1143 is defined between the bottom wall of the mounting groove and the lower bottom wall of the mounting wall 114. A second wall portion 1144 is defined between the bottom wall of the pressure relief groove 60 and the lower bottom wall of the mounting wall 114.

[0107] Please continue to refer to Figures 5-7 and Figure 12, which is a structural schematic diagram of the mounting wall 114 of some embodiments of the present application. The air guide groove 81 is provided on the side of the mounting wall 114 facing the inner cavity of the shell 11, and the pressure relief groove 60 is provided on the side of the mounting wall 114 facing away from the inner cavity of the shell 11.

[0108] The side of the mounting wall 114 facing away from the inner cavity of the shell 11, i.e., the outer side of the shell 11, makes it easy to confirm the position of the pressure relief groove 60 on the shell 11, thereby facilitating confirmation of the position of the explosion-proof valve 6. In this way, when installing the battery cell 10, it is convenient to use the position of the explosion-proof valve 6 to determine the relative position of the battery cell 10.

[0109] Among them, the thickness direction of the mounting wall 114 extends in the up-down direction. In the up-down direction, the opening 1110 of the air guide groove 81 faces the top of the mounting wall 114, and the opening 1110 of the pressure relief groove 60 faces the bottom of the mounting wall 114. A first wall portion 1143 is defined between the bottom wall of the mounting groove and the lower bottom wall of the mounting wall 114, and a second wall portion 1144 is defined between the bottom wall of the pressure relief groove 60 and the upper wall of the mounting wall 114.

[0110] Please continue to refer to FIG. 8 . In some embodiments of the present application, the air guide groove 81 and the pressure relief groove 60 are arranged at intervals.

[0111] The wall thickness of the portion of the mounting wall 114 separating the gas guide groove 81 and the pressure relief groove 60 is not processed to be thinner, thereby ensuring the structural strength of the wall surface separating the gas guide groove 81 and the pressure relief groove 60 on the mounting wall 114, thereby reducing the possibility of deformation of the mounting wall 114 and enabling the gas guide groove 81 located on the mounting wall 114 to smoothly guide the gas to the pressure relief groove 60.

[0112] In other embodiments of the present application, the air guide groove 81 and the pressure relief groove 60 are in communication.

[0113] The gas can flow along the gas guiding groove 81 toward the pressure relief groove 60 and into the pressure relief groove 60 , thereby improving the gas guiding efficiency and achieving rapid pressure relief of the battery cell 10 .

[0114] 7 and 8 , the pressure relief groove 60 includes a first pressure relief groove segment 61 and a second pressure relief groove segment 62 that are arranged crosswise.

[0115] The cross arrangement means that the first pressure relief trough section 61 and the second pressure relief trough section 62 have an intersection, the first pressure relief trough section 61 and the second pressure relief trough section 62 can extend along a straight line, the angle between the first pressure relief trough section 61 and the second pressure relief trough section 62 can be a right angle or an acute angle, and the first pressure relief trough section 61 and the second pressure relief trough section 62 can also extend along a curve.

[0116] The first pressure relief groove section 61 and the second pressure relief groove section 62 are arranged crosswise, which facilitates the communication between the first pressure relief groove section 61 and the second pressure relief groove section 62, and at the same time facilitates the increase in the area of ​​the explosion-proof valve 6, so that the gas can be evenly distributed in the first pressure relief groove section 61 and the second pressure relief groove section 62. When the air pressure in the battery cell 10 reaches a critical value, the gas can form a larger opening 1110 when breaking through the explosion-proof valve 6, thereby facilitating the rapid pressure relief of the battery cell 10.

[0117] 7 and 8 , the first pressure relief groove section 61 extends along the length direction of the installation wall 114 , and the second pressure relief groove section 62 extends along the width direction of the installation wall 114 .

[0118] The angle formed between the first pressure relief trough section 61 and the second pressure relief trough section 62 is 90°, which makes it easy to reduce the resistance encountered by the gas when flowing between the first pressure relief trough section 61 and the second pressure relief trough section 62, thereby allowing the gas to be quickly and evenly distributed in the first pressure relief trough section 61 and the second pressure relief trough section 62.

[0119] Please continue to refer to Figure 8. The pressure relief groove 60 includes a first pressure relief groove section 61 and three second pressure relief groove sections 62. The first pressure relief groove section 61 extends in the left-right direction, the second pressure relief groove section 62 extends in the front-back direction, and the three second pressure relief groove sections 62 are arranged at intervals in the left-right direction. The first pressure relief groove section 61 is connected to the middle parts of the three second pressure relief groove sections 62, so that the gas in the first pressure relief groove section 61 can flow to the second pressure relief groove section 62, and the gas in the second pressure relief groove section 62 can also flow to the first pressure relief groove section 61 to balance the air pressure between the first pressure relief groove section 61 and the second pressure relief groove section 62, so as to reduce the probability of a higher air pressure in a certain area of ​​the pressure relief groove 60, so as to evenly distribute the gas in the first pressure relief groove section 61 and the second pressure relief groove section 62. When the air pressure in the battery cell 10 reaches a critical value, the gas can evenly break through the explosion-proof valve 6 and form a larger opening 1110, thereby facilitating rapid pressure relief of the battery cell 10.

[0120] 8 and 11 , the air guide groove 81 and the explosion-proof valve 6 are arranged in the length direction of the installation wall 114 . The air guide groove 81 includes a first air guide groove section 811 , which extends along the length direction of the installation wall 114 .

[0121] The X direction is the length direction of the mounting wall 114, and the Y direction is the width direction of the mounting wall 114. The gas guide groove 81 and the explosion-proof valve 6 are arranged in the X direction. The gas guide groove 81 can guide the gas generated by the electrode assembly 2 to the explosion-proof valve 6 along the X direction. The gas can flow from one end of the mounting wall 114 in the length direction to the explosion-proof valve 6 along the first gas guide groove section 811, so as to guide the gas at the end farther from the explosion-proof valve 6 in the battery cell 10 to the explosion-proof valve 6, so that the gas can gather at the explosion-proof valve 6.

[0122] 8 and 11 , there are multiple first air guide groove sections 811 , and the multiple first air guide groove sections 811 are arranged at intervals in the width direction of the installation wall 114 .

[0123] The width direction of the mounting wall 114 extends along the Y direction, the length direction of the mounting wall 114 extends along the X direction, the first air guide groove extends along the X direction, and the plurality of first air guide grooves are arranged at intervals along the Y direction. This facilitates increasing the air guide range of the air guide groove 81, thereby facilitating increasing the air guide efficiency of the air guide groove 81. The air guide groove 81 can quickly guide the gas to the pressure relief groove 60, thereby facilitating increasing the pressure relief speed of the battery cell.

[0124] Please continue to refer to Figure 8 and further refer to Figure 13. Figure 13 is a structural schematic diagram of the installation wall 114 of some embodiments of the present application. In each air guide groove 81, the distance between any two adjacent first air guide groove sections 811 is equal.

[0125] Multiple first gas guide groove segments 811 extend along the Y direction, and the distance between two adjacent first gas guide groove segments 811 along the Y direction is equal, so that the multiple first gas guide groove segments 811 can uniformly guide the gas generated by the electrode assembly 2, and then uniformly guide the gas to the explosion-proof valve 6.

[0126] Please refer to Figure 14, which is a structural schematic diagram of the installation wall 114 of some embodiments of the present application. In each air guide groove 81, the distance between at least two adjacent first air guide groove sections 811 is not equal to the distance between another two adjacent first air guide groove sections 811.

[0127] The plurality of first air guiding slot segments 811 extend along the Y direction, and the distance between at least two adjacent first air guiding slot segments 811 in the Y direction is not equal to the distance between another two adjacent first air guiding slot segments 811 in the Y direction.

[0128] Among them, the distance between at least two adjacent first air guide groove sections 811 is not equal to the distance between the other two adjacent first air guide groove sections 811, that is, the multiple first air guide groove sections 811 in a part of the area on the installation wall 114 are arranged more densely in the Y direction, and the multiple first air guide groove sections 811 in a part of the area are arranged more sparsely in the Y direction, so as to carry out targeted guidance of gas at different positions.

[0129] In some cases, more gas may be generated in some areas within the battery cell 10, so that multiple first gas guide segments in the corresponding areas on the mounting wall 114 are densely arranged along the Y direction, which can increase the efficiency of the first gas guide groove segment 811 in guiding the gas in the area, so as to smoothly guide the gas to the explosion-proof valve 6.

[0130] Please continue to refer to Figures 8, 13 and 14. The air guide groove 81 also includes a second air guide groove section 812, which extends along the width direction of the mounting wall 114. The first air guide groove section 811 is connected to the second air guide groove section 812 at one end away from the explosion-proof valve 6 and the other end extends toward the explosion-proof valve 6.

[0131] The second air guide groove section 812 extends along the Y direction, and the first air guide groove section 811 extends along the X direction. The end of the first air guide groove section 811 away from the explosion-proof valve 6 is connected to the second air guide groove section 812. The provision of the second air guide groove section 812 facilitates increasing the volume of the air guide groove 81, allowing the air guide groove 81 to accommodate more gas, thereby facilitating improving the flow guidance efficiency of the air guide groove 81. Specifically, the gas in the second air guide groove 81 can enter the first air guide groove 81 and flow along the first air guide groove 81 toward the explosion-proof valve 6.

[0132] 8 , 13 and 14 , the air guides 80 include two air guides 80 , which are spaced apart in the length direction of the installation wall 114 , and the explosion-proof valve 6 is located between the two air guides 80 .

[0133] The two gas guide grooves 81 are arranged at intervals in the X direction. In the X direction, the explosion-proof valve 6 is located between the two gas guide parts 80. The gas guide grooves 81 of the two gas guide parts 80 can guide the gas at both ends of the explosion-proof valve 6 in the X direction, so that the gas located at both ends of the explosion-proof valve 6 in the X direction flows toward the explosion-proof valve 6 along the corresponding gas guide grooves 81, thereby further improving the gas guide efficiency and increasing the pressure relief speed of the battery cell 10.

[0134] 8 , the explosion-proof valve 6 is located at the center of the mounting wall 114 in the longitudinal direction. The two air guides 80 have the same structure and are symmetrically arranged about the center of the explosion-proof valve 6 .

[0135] The center line of the explosion-proof valve 6 extends along the Y direction, and the two air guide portions 80 have the same structure and are arranged symmetrically about the center of the explosion-proof valve 6, so that the two air guide portions 80 can evenly guide the gas located on both sides of the explosion-proof valve 6 in the X direction, so that the gas can flow evenly to the explosion-proof valve 6, reducing the possibility of air flow blockage in the air guide channel, thereby facilitating the improvement of the air guide efficiency and the pressure relief efficiency of the battery cell 10.

[0136] Please continue to refer to Figures 13 and 14. The mounting wall 114 has a first end and a second end arranged opposite to each other in its length direction. The distance between the explosion-proof valve 6 and the first end is greater than the distance between the explosion-proof valve 6 and the second end. The area of ​​the air guide portion 80 located between the explosion-proof valve 6 and the first end is greater than the area of ​​the air guide portion 80 located between the explosion-proof valve 6 and the second end.

[0137] The first end and the second end of the mounting wall 114 are the two ends in the length direction of the mounting wall 114. The length direction of the mounting wall 114 extends in the left-right direction. The distance between the left end of the explosion-proof valve 6 and the left end of the mounting wall 114 is S1, and the distance between the right end of the explosion-proof valve 6 and the right end of the mounting wall 114 is S2. S1 is not equal to S2.

[0138] In some cases, more gas may be generated in some areas inside the battery cell 10. If the gas on the left side of the battery cell 10 is more than the gas on the right side of the battery cell 10, the distance between the explosion-proof valve 6 and the first end is greater than the distance between the explosion-proof valve 6 and the second end, that is, S1>S2, and the area of ​​the air guide portion 80 located on the left side of the mounting wall 114 is greater than the area of ​​the air guide portion 80 located on the right side of the mounting wall 114, so as to increase the area of ​​the air guide portion 80 on the left side of the mounting wall 114, thereby improving the flow guidance efficiency of the gas on the left side of the battery cell 10, and thus being able to adapt to the situation where there is more gas on the left side of the battery cell 10.

[0139] Of course, if the gas on the right side of the battery cell 10 is greater than the gas on the left side of the battery cell 10, then S2>S1, and the area of ​​the air guide portion 80 located on the right side of the mounting wall 114 is greater than the area of ​​the air guide portion 80 located on the left side of the mounting wall 114, so as to increase the area of ​​the air guide portion 80 on the right side of the mounting wall 114, thereby improving the flow guidance efficiency of the gas on the right side of the battery cell 10, and thus being able to adapt to the situation where there is more gas on the right side of the battery cell 10.

[0140] Please refer to Figure 5, and continue to refer to Figures 15 and 16. Figure 15 is a structural schematic diagram of the battery cell 10 of some embodiments of the present application, and Figure 16 is a cross-sectional view at BB in Figure 15. The shell 11 includes a shell cover 112 and a shell body 111 with an opening 1110. The shell cover 112 covers the opening 1110, and the mounting wall 114 is located on the shell cover 112 or the shell body 111.

[0141] The shell cover 112 is used to cover the opening 1110 to form an internal environment of the battery cell 10. When the gas in the battery cell 10 reaches a critical value, the gas can break through the explosion-proof valve 6 on the mounting wall 114, thereby achieving pressure relief for the battery cell 10.

[0142] The installation wall 14 may be provided on the housing cover 112 , or the installation wall 114 may be a side wall of the housing body 111 adjacent to the housing cover 112 , and no further restrictions are imposed here.

[0143] Please refer to Figure 5. The mounting wall 114 is located on the shell cover 112, and the pole 12 is provided on the wall of the shell body 111 opposite the opening 1110. The pole 12 and the mounting wall 114 are located at both ends of the battery cell 10 to separate the pole 12 and the explosion-proof valve 6. In this way, when gas gathers at the explosion-proof valve 6, the impact of the gas on the pole 12 can be reduced.

[0144] In addition, the shell cover 112 is smaller in volume than the housing 11 , so it is simpler to form the air guide groove 81 and the pressure relief groove 60 on the shell cover 112 , thereby reducing the difficulty of processing.

[0145] Please refer to Figure 5, and continue to refer to Figures 17 and 18. Figure 17 is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. The figure is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. The shell 11 includes a shell cover 112 and a shell body 111 having an opening 1110. The shell cover 112 covers the opening 1110. The mounting wall 114 is located on the shell cover 112. The wall of the shell body 111 opposite to the mounting wall 114 is provided with a pole 12. The pole 12 is provided with a receiving portion 121. At least a portion of the conductive portion 22 extends into and is accommodated in the receiving portion 121, and the conductive portion 22 is electrically connected to the pole 12. In other words, the pole 12 is configured as a hollow structure.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] 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 .

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] 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.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] 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.

[0162] 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.

[0163] 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.

[0164] 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.

[0165] 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.

[0166] 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.

[0167] 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.

[0168] 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.

[0169] 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.

[0170] 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.

[0171] 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.

[0172] 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).

[0173] 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.

[0174] 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.

[0175] 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.

[0176] 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.

[0177] 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.

[0178] 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.

[0179] 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.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] 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.

[0184] 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.

[0185] 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.

[0186] 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.

[0187] 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.

[0188] 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.

[0189] 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.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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 .

[0195] 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.

[0196] 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.

[0197] 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.

[0198] 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.

[0199] 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.

[0200] 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.

[0201] 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.

[0202] 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.

[0203] 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.

[0204] 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.

[0205] 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.

[0206] 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.

[0207] 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.

[0208] In the above technical solution, the cover plate 13 is configured as a composite form, and the first conductive member 131 is configured to be made of the same material as the pole 12, thereby facilitating electrical connection between the first conductive member 131 and the pole 12. For example, the first conductive member 131 can be easily and stably connected to the pole 12 through welding. In addition, because the second conductive member 132 is made of a different material from 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 from the pole 12. For example, the second conductive member 132 can be easily and stably connected to a busbar component made of the same material as the second conductive member 132 through welding.

[0209] 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.

[0210] 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.

[0211] 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.

[0212] 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.

[0213] 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.

[0214] 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.

[0215] 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.

[0216] 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.

[0217] 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.

[0218] According to some embodiments of the present application, the present application further provides a battery 100, comprising the battery cell 10 of the above solution.

[0219] In the technical solution of the embodiment of the present application, an air guide groove 81 is provided on the mounting wall 114. The air guide groove 81 can guide the air in the housing 11 to flow toward the explosion-proof valve 6, thereby improving the exhaust efficiency of the battery cell 10 and realizing rapid pressure relief of the battery cell 10. Compared with providing a separate air guide component inside the battery cell 10, the air guide groove 81 is provided on the mounting wall 114 to form the air guide portion 80, which is convenient for reducing the space occupied by the air guide portion 80 in the battery cell 10.

[0220] 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.

[0221] In the technical solution of the embodiment of the present application, an air guide groove 81 is provided on the mounting wall 114. The air guide groove 81 can guide the air in the housing 11 to flow toward the explosion-proof valve 6, thereby improving the exhaust efficiency of the battery cell 10 and realizing rapid pressure relief of the battery cell 10. Compared with providing a separate air guide component inside the battery cell 10, the air guide groove 81 is provided on the mounting wall 114 to form the air guide portion 80, which is convenient for reducing the space occupied by the air guide portion 80 in the battery cell 10.

[0222] According to some embodiments of the present application, a battery cell 10 is provided. The battery cell 10 includes a housing 11 , an electrode assembly 2 , an explosion-proof valve 6 , and an air guide 80 . The electrode assembly 2 is disposed in the housing 11 .

[0223] The shell 11 includes a shell body 111 and a shell cover 112. The shell body 111 has an opening 1110. The shell cover 112 covers the opening 1110 to form an internal environment of the battery cell 10. The electrode assembly 2 is arranged in the internal environment. The shell cover 112 forms an installation wall 114. The explosion-proof valve 6 includes a pressure relief groove 60. The pressure relief groove 60 is opened on the installation wall 114. The air guide portion 80 includes an air guide groove 81. The air guide groove 81 is opened on the installation wall 114. The air guide groove 81 is used to guide the gas generated by the electrode assembly 2 to the pressure relief groove 60.

[0224] By performing laser cutting or CNC stamping on the mounting wall 114, the pressure relief groove 60 and the air guide groove 81 can be formed on the mounting wall 114. The mounting wall 114 includes a first wall portion 1143 and a second wall portion 1144. After the air guide groove 81 is provided on the mounting wall 114, the wall portion of the mounting wall 114 opposite the air guide groove 81 in the Z direction is the first wall portion 1143. After the pressure relief groove 60 is provided on the mounting wall 114, the wall portion of the mounting wall 114 opposite the pressure relief groove 60 in the Z direction is the second wall portion 1144. The second wall portion 1144 forms the explosion-proof valve 6.

[0225] The depth H1 of the gas guide groove 81 is less than the depth H2 of the pressure relief groove 60, so as to control the thickness of the first wall portion 1143 to be greater than the thickness of the second wall portion 1144, thereby making the structural strength of the first wall portion 1143 greater than the structural strength of the second wall portion 1144. In this way, when the air pressure in the battery cell 10 reaches a critical value, the gas will preferentially break through the second wall portion 1144, that is, preferentially destroy the explosion-proof valve 6.

[0226] In some embodiments, the air guide groove 81 and the pressure relief groove 60 are both arranged on the side of the mounting wall 114 facing the inner cavity of the shell 11. In other embodiments, the air guide groove 81 is arranged on the side of the mounting wall 114 facing the inner cavity of the shell 11, and the pressure relief groove 60 is arranged on the side of the mounting wall 114 facing away from the inner cavity of the shell 11.

[0227] Among them, the pressure relief groove 60 includes a first pressure relief groove section 61 and a second pressure relief groove section 62 arranged crosswise. The first pressure relief groove section 61 extends along the length direction of the mounting wall 114, and the second pressure relief groove section 62 extends along the width direction of the mounting wall 114. The first pressure relief groove section 61 and the second pressure relief groove section 62 are connected. This arrangement facilitates increasing the area of ​​the first pressure relief groove section 61 and the second pressure relief groove section 62, thereby increasing the area of ​​the explosion-proof valve 6, so that the gas can be evenly distributed in the first pressure relief groove section 61 and the second pressure relief groove section 62. When the air pressure in the battery cell 10 reaches the critical value, the gas is convenient to form a larger opening 1110 when breaking through the explosion-proof valve 6, thereby facilitating the rapid pressure relief of the battery cell 10.

[0228] The air guide groove 81 includes a first air guide groove section 811 and a second air guide groove section 812. The first air guide groove section 811 extends along the length direction of the installation wall 114, and the second air guide groove section 812 extends along the width direction of the installation wall 114. The first air guide groove section 811 and the second air guide groove section 812 are connected. This arrangement facilitates increasing the volume of the air guide groove 81, so that the air guide groove 81 can accommodate more gas, thereby facilitating improving the flow guidance efficiency of the air guide groove 81, wherein the gas in the second air guide groove 81 can enter the first air guide groove 81 and flow along the first air guide groove 81 to the explosion-proof valve 6.

[0229] Among them, the air guide parts 80 include two, and the explosion-proof valve 6 is located between the two air guide parts 80. The explosion-proof valve 6 can be located at the center position of the installation wall 114, or it can be set offset from the center position of the installation wall 114. The specific position can be determined according to actual needs and is not limited here.

[0230] When the explosion-proof valve 6 is disposed closer to the center of the installation wall 114 , the area of ​​the air guide portion 80 on one side of the explosion-proof valve 6 is larger, and the area of ​​the air guide portion 80 on the other side of the explosion-proof valve 6 is smaller.

[0231] 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, wherein: include: a housing including a mounting wall; An electrode assembly is disposed in the housing; An explosion-proof valve, arranged on the installation wall; The gas guide portion includes a gas guide groove opened on the installation wall, and the gas guide groove is used to guide the gas generated by the electrode assembly to the explosion-proof valve.

2. The battery cell according to claim 1, wherein: The explosion-proof valve comprises a pressure relief groove opened on the installation wall.

3. The battery cell according to claim 2, wherein: The depth of the air guide groove is smaller than the depth of the pressure relief groove.

4. The battery cell according to claim 2 or 3, wherein: The air guide groove and the pressure relief groove are both arranged on a side of the installation wall facing the inner cavity of the shell.

5. The battery cell according to claim 2 or 3, wherein: The air guide groove is arranged on a side of the installation wall facing the inner cavity of the shell, and the pressure relief groove is arranged on a side of the installation wall facing away from the inner cavity of the shell.

6. The battery cell according to any one of claims 2 to 5, wherein: The air guide groove and the pressure relief groove are arranged at intervals; or, the air guide groove and the pressure relief groove are communicated.

7. The battery cell according to any one of claims 2 to 6, wherein: The pressure relief groove includes a first pressure relief groove section and a second pressure relief groove section which are arranged crosswise.

8. The battery cell according to claim 7, wherein: The first pressure relief groove section extends along the length direction of the installation wall, and the second pressure relief groove section extends along the width direction of the installation wall.

9. The battery cell according to any one of claims 1 to 8, wherein: The air guide groove and the explosion-proof valve are arranged in the length direction of the installation wall, and the air guide groove includes: A first air guide groove section extends along the length direction of the installation wall.

10. The battery cell according to claim 9, wherein: There are multiple first air guide groove segments, and the multiple first air guide groove segments are arranged at intervals in the width direction of the installation wall.

11. The battery cell according to claim 10, wherein: In each of the air guiding grooves, the distance between any two adjacent first air guiding groove sections is equal.

12. The battery cell according to claim 10, wherein: In each of the air guiding grooves, a distance between at least two adjacent first air guiding groove sections is not equal to a distance between another two adjacent first air guiding groove sections.

13. The battery cell according to any one of claims 9 to 12, wherein: The air guide groove also includes: A second air guide groove section, wherein the second air guide groove section extends along the width direction of the installation wall, and one end of the first air guide groove section away from the explosion-proof valve is connected to the second air guide groove section and the other end extends toward the explosion-proof valve.

14. The battery cell according to any one of claims 1 to 13, wherein: The air guide parts include two air guide parts, which are arranged at intervals in the length direction of the installation wall, and the explosion-proof valve is located between the two air guide parts.

15. The battery cell according to claim 14, wherein: The explosion-proof valve is arranged at the central position of the installation wall in the length direction, and the two air guide parts have the same structure and are arranged symmetrically about the center of the explosion-proof valve.

16. The battery cell according to claim 14, wherein: The installation wall has a first end and a second end which are arranged opposite to each other in the length direction thereof, and the distance between the explosion-proof valve and the first end is greater than the distance between the explosion-proof valve and the second end; Wherein, the area of ​​the air guide portion between the explosion-proof valve and the first end is greater than the area of ​​the air guide portion between the explosion-proof valve and the second end.

17. The battery cell according to any one of claims 1 to 16, wherein: The shell body comprises a shell cover and a shell body with an opening, the shell cover covers the opening, and the mounting wall is located on the shell cover or the shell body.

18. The battery cell according to any one of claims 1 to 16, wherein: The shell comprises a shell cover and a shell body with an opening, the shell cover covers the opening, the mounting wall is located on the shell cover, a pole is provided on a wall of the shell body opposite to the mounting wall, and the pole is provided with a receiving portion; The electrode assembly includes an active material coating portion and a conductive portion connected to the active material coating portion, and at least a portion of the conductive portion extends into the accommodating portion and is connected to the pole.

19. The battery cell according to claim 18, 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.

20. The battery cell according to claim 18, 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 interior of the shell through a through hole, the conductive portion is passed through the through hole and is at least partially accommodated in the second accommodating groove.

21. A battery, wherein: The invention comprises a battery cell according to any one of claims 1 to 20.

22. An electrical device, wherein: Comprising a battery according to claim 21.

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