Casing body assembly for battery cell, battery cell, battery, and electrical device

Abstract

A battery cell casing body assembly, and a battery cell, battery, or electrical device, the battery cell casing body assembly includes a casing body including a mounting wall having an opening and a mounting hole therethrough, an explosion-proof valve disposed in the mounting hole and connected to the mounting wall, and a terminal post disposed in the mounting wall and spaced apart from the mounting hole. In the battery cell casing body assembly according to the present embodiment, the terminal post is mounted on the mounting wall of the casing body to increase the structural strength of the mounting wall and reduce deformation of the mounting wall, thereby improving the protective effect of the casing body on the electrode assembly and easily controlling the consistency of the explosion pressure of the explosion-proof valve.

Description

[Technical Field]

[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS] This application is based on and claims priority from a Chinese patent application bearing application number 202322632592.6 and filed on September 26, 2023, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of batteries, and more particularly to a battery cell casing body assembly, a battery cell, a battery, and an electrical device. [Background technology]

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, are an important component of this industry. For electric vehicles, battery technology is a key factor in their development. In related technologies, the battery cell casing cover is equipped with mounting holes for accommodating explosion-proof valves, which affects the structural strength of the casing cover and reduces the reliability of the battery cell. Summary of the Invention

[0004] In view of the above problems, the present application provides a casing body assembly for a battery cell, a battery, a battery, and an electrical device, in which the structural strength of the casing body is higher and it is less likely to deform.

[0005] In a first aspect, the present application provides a casing body assembly for a battery cell, including a casing body including a mounting wall having an opening and a mounting hole extending therethrough, an explosion-proof valve provided in the mounting hole and connected to the mounting wall, and a pole provided in the mounting wall and spaced apart from the mounting hole.

[0006] In the technical solution of the embodiment of the present application, the electrode pole is installed on the mounting wall of the casing body, and the electrode pole is used to increase the structural strength of the mounting wall, making the mounting wall less likely to deform, thereby improving the protective effect of the casing body on the electrode assembly and easily controlling the consistency of the explosion pressure of the explosion-proof valve.

[0007] In some embodiments, a through hole is formed through the mounting wall, and the pole is disposed in the through hole and connected to the mounting wall.

[0008] The through-holes are used to prevent connection between the electrode posts and the electrode assemblies, so that when the electrode posts are installed in the through-holes, they can be electrically connected to the electrode assemblies at the through-holes, allowing the electrode posts to output electrical energy from the battery cells to an external circuit. The electrode posts are connected to the mounting wall, which can reinforce the area of ​​the mounting wall near the through-holes and further reinforce the structural strength of the entire mounting wall, making the mounting wall less likely to deform.

[0009] In some embodiments, the outer peripheral wall of the pole post has an annular groove extending along the circumferential direction thereof, and the annular groove fits onto the hole edge of the communication hole.

[0010] The annular groove fits tightly to the edge of the communicating hole, firmly securing the electrode post to the mounting wall, preventing it from easily falling off the mounting wall. The engagement of the annular groove with the edge of the communicating hole restricts movement of the electrode post, and also reduces the possibility of collision between the electrode post and the edge of the communicating hole, allowing the electrode post to be more stably electrically connected to the battery cell and to stably output electrical energy from the battery cell to an external circuit. By stably securing the electrode post to the communicating hole in the mounting wall, even if the pressure inside the battery cell is high or one side of the electrode post is subjected to pressure, the electrode post is less likely to fall off the mounting wall, and the electrode post can more stably reinforce the structural strength of the mounting wall.

[0011] In some embodiments, the minimum distance between the edge of the communication hole and the edge of the mounting hole is 1 mm to 30 mm.

[0012] The distance between the adjacent edges of the through holes and the adjacent edges of the mounting holes is 1 mm or more to prevent electrical connection between the mounting holes and the communicating holes, and a solid area of ​​at least 1 mm is provided between the mounting holes and the communicating holes to reserve a press-fit area for press processing, and the communicating holes and the mounting holes are easily formed by processing. The distance between the adjacent edges of the through holes and the adjacent edges of the mounting holes is 30 mm or less, and the mounting holes are not far apart. By reducing the distance between the mounting holes and the communicating holes, the terminal post can sufficiently reinforce the structural strength of the area near the communicating holes in the mounting wall after installation of the terminal post through the communicating holes. Because the communicating holes and the mounting holes are not far apart, the terminal post can sufficiently reinforce the structural strength of the entire mounting wall after installation of the terminal post through the communicating holes, and the terminal post can sufficiently reduce the impact of the mounting holes on the structural strength of the mounting wall.

[0013] In some embodiments, the mounting hole includes a first hole section and a second hole section that are aligned and communicate with each other in the thickness direction of the mounting wall, the second hole section is closer to the internal cavity of the casing body than the first hole section, a first step surface is formed between the first hole section and the second hole section, and the explosion-proof valve is provided in the first hole section and fitted to the first step surface.

[0014] The second hole section can separate the space between the first hole section and the inside of the casing body. After the explosion-proof valve is installed on the first step surface, the explosion-proof valve and the internal components of the casing body are separated by at least the first hole section. In this way, when the air pressure inside the battery cell increases, gas can be collected in the first hole section, and the gas can directly apply pressure to the explosion-proof valve from the first hole section. When the air pressure inside the battery cell exceeds a threshold, the air pressure can destroy the explosion-proof valve, thereby realizing the pressure release of the battery cell.

[0015] In some embodiments, the mounting hole further includes a third hole section communicating with an end of the first hole section opposite the second hole section, a second step surface is formed between the first hole section and the third hole section, the explosion-proof valve is welded to the mounting wall to form a welded seam, and the third hole section is used to accommodate the welded seam.

[0016] When the explosion-proof valve and the mounting wall are welded together, the weld seam that is formed protrudes from the explosion-proof valve, and the third hole section can reserve space for the weld seam in advance. In this way, when installing components on the mounting wall, the possibility of the components rubbing against the weld seam can be reduced so as to protect the components and the weld seam, and the weld seam can stably connect the explosion-proof valve and the mounting wall so as to stably fix the explosion-proof valve to the mounting wall.

[0017] In some embodiments, the casing body assembly of the battery cell further includes a protective sheet disposed on the opposite side of the explosion-proof valve from the second hole section, for covering the explosion-proof valve.

[0018] The protective sheet can cover the explosion-proof valve to isolate it from the external environment, provide dust protection, and reduce the area of ​​contact between the explosion-proof valve and the outside air, thus easily slowing down the rate at which the explosion-proof valve oxidizes.

[0019] In some embodiments, the mounting hole further includes a fourth hole step communicating with an end of the third hole step opposite the first hole step, a third step surface is formed between the fourth hole step and the third hole step, and the protective sheet is provided on the fourth hole step and engages with the third step surface.

[0020] The protective sheet is supported by the third step surface, so that the protective sheet is installed on the opposite side to the inside of the explosion-proof valve casing body, and the protective sheet can further isolate the explosion-proof valve from the external environment and provide dust prevention. Meanwhile, the protective sheet is installed in the fourth hole section, which reserves space for the installation of the protective sheet in advance, so that the protective sheet can be installed in the mounting hole, reducing the volume of the protective sheet exposed from the mounting hole and protecting the protective sheet, and further reducing the possibility of objects in the external environment rubbing against the protective sheet.

[0021] In some embodiments, an exhaust groove communicating with the mounting hole is provided on the mounting wall opposite the internal cavity of the casing body, and the protective sheet covers a part of the exhaust groove.

[0022] After the protective sheet is installed on the mounting wall, there is at least a third hole between the protective sheet and the explosion-proof valve, that is, one side of the protective sheet is the third hole and the other side is the external environment, and the exhaust groove is connected to the third hole so that the air pressure on both sides of the protective sheet can be balanced. In this way, when the air pressure in the external environment is higher or when the air pressure in the third hole is higher, the possibility of the protective sheet being damaged can be reduced, and the protective sheet can fully protect the explosion-proof valve.

[0023] In some embodiments, the cross-sectional shape of the exhaust groove is rectangular, trapezoidal, or triangular.

[0024] In some embodiments, the explosion-proof valve is a one-piece molding and has a reduced thickness portion, or the explosion-proof valve is a split structure.

[0025] When the air pressure inside the battery cell exceeds a threshold, the air pressure can preferentially destroy the thickness-reducing portion or the connection area of ​​the split structure, and further destroy the explosion-proof valve, connecting the inside of the battery cell to the external environment and realizing pressure release for the battery cell.

[0026] In some embodiments, the mounting wall is provided with one terminal post, and the terminal post and the explosion-proof valve are spaced apart in the longitudinal direction of the mounting wall.

[0027] In some embodiments, the mounting wall is provided with at least two poles, the at least two poles being spaced apart along the length of the mounting wall, and the explosion-proof valve being located between the two poles.

[0028] By positioning the explosion-proof valve between the two poles, after the poles are installed in the communication hole, the two poles are positioned on both sides of the mounting hole, reinforcing the structural strength of the area of ​​the mounting wall near the mounting hole from both sides of the mounting hole. Furthermore, the impact of the mounting holes on the structural strength of the mounting wall is sufficiently reduced, making it easy to sufficiently reinforce the structural strength of the mounting wall.

[0029] In some embodiments, the mounting wall is located on a wall of the casing body that faces the opening.

[0030] The mounting wall is located on a wall opposite the opening of the casing body, so that when the electrode assembly is attached to the casing body, the electrode posts on the mounting wall and the electrode assembly can be easily placed face to face, and further, when the electrode assembly is attached in a predetermined position, the electrode posts can be easily electrically connected to the electrode assembly.

[0031] In a second aspect, the present application provides a battery cell including a casing body assembly of the battery cell of the above embodiment, an electrode assembly provided within the casing body and including an active material application portion and a conductive portion connected to the active material application portion and electrically connected to the electrode post, and a casing cover covering the opening so as to seal the electrode assembly within the casing body.

[0032] In the technical solution of the embodiment of the present application, the electrode pole is installed on the mounting wall of the casing body, and the electrode pole is used to increase the structural strength of the mounting wall, making the mounting wall less likely to deform, thereby improving the protective effect of the casing body on the electrode assembly and easily controlling the consistency of the explosion pressure of the explosion-proof valve.

[0033] In some embodiments, the mounting wall is located on a wall of the casing body facing the opening, the pole is provided with a receiving portion, and at least a portion of the conductive portion extends into the receiving portion.

[0034] In the technical solutions of the embodiments of the present application, by accommodating at least a portion of the conductive part within the accommodating part, the space occupied by the battery cells themselves can be reduced, so that more battery cells can be accommodated in a battery of the same volume, and the volumetric energy density of the battery can be improved. In addition, by accommodating at least a portion of the conductive part within the accommodating part to occupy the space within the pole, the redundancy of the conductive part within the casing can be reduced to at least a certain extent, the probability of a short circuit between the conductive part and the active material coating part can be reduced, and the probability of a short circuit in the battery cells can be reduced, thereby improving the operational reliability and stability of the battery cells and the battery.

[0035] In some embodiments, the accommodating portion includes a first accommodating groove, the surface of the pole facing the active material coated portion is the pole inner end face, the groove opening of the first accommodating groove is formed in the pole inner end face, and at least a portion of the conductive portion is accommodated in the first accommodating groove.

[0036] In the above technical solution, on the one hand, the provision of the first accommodating groove in the pole reduces the weight of the pole to a certain extent, thereby improving the weight-energy density of the battery cell and the battery. On the other hand, the groove opening of the first accommodating groove is formed on the inner end face of the pole, which is the surface of the pole closest to the active material coated portion, so the first accommodating groove can open toward the active material coated portion, and the conductive portion can easily extend into the first accommodating groove, improving assembly efficiency. Furthermore, a first accommodating groove of this type is easy to process, improving manufacturing efficiency.

[0037] In some embodiments, the accommodating portion includes a second accommodating groove, the surface of the pole opposite to the active material coated portion being the pole outer end face, the groove opening of the second accommodating groove being formed in the pole outer end face, the second accommodating groove communicating with the internal cavity of the casing body via a through hole, and the conductive portion being inserted into the through hole and at least a portion of the conductive portion being accommodated in the second accommodating groove.

[0038] In the above technical solution, on the one hand, by providing the second accommodating groove in the pole, the weight of the pole can be reduced to a certain extent, thereby improving the weight energy density of the battery cell and the battery; on the other hand, the groove opening of the second accommodating groove is formed on the outer end surface of the pole, and the outer end surface of the pole is the surface opposite to the active material coated portion of the pole, so that the second accommodating groove can be opened in the direction opposite to the active material coated portion. In this way, when at least a portion of the conductive part is accommodated in the second accommodating groove, the groove opening of the second accommodating groove can be used to easily accommodate and organize the conductive part, and the groove opening of the second accommodating groove can be used to easily electrically connect the conductive part to the pole, which further reduces the difficulty of manufacturing the battery cell and improves the manufacturing efficiency of the battery cell.

[0039] In a third aspect, the present application provides a battery including the battery cell of the above embodiment, in which the electrode posts are installed on the mounting wall of the casing body, thereby increasing the structural strength of the mounting wall and making the mounting wall less susceptible to deformation, thereby improving the protection effect of the casing body on the electrode assembly and easily controlling the consistency of the explosion pressure of the explosion-proof valve.

[0040] In a fourth aspect, the present application provides an electric device including the battery of the above embodiment, in which the electrode posts are installed on the mounting wall of the casing body, thereby increasing the structural strength of the mounting wall and making the mounting wall less susceptible to deformation, thereby improving the protection effect of the casing body on the electrode assembly and easily controlling the consistency of the explosion pressure of the explosion-proof valve.

[0041] The above description is merely an outline of the technical solution of the present application. In order to make the technical means of the present application more clearly understood and to be able to implement the present application in accordance with the contents of the specification, and to make the above and other objectives, features and advantages of the present application more clearly and easily understood, specific embodiments of the present application are specifically listed below. [Brief explanation of the drawings]

[0042] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of the preferred embodiments. The drawings are for the purpose of illustrating the preferred embodiments only and are not to be construed as limiting the present application. In the drawings, like elements are designated by like reference numerals throughout. [Figure 1] 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application. [Figure 2] FIG. 1 is an exploded view of a battery according to some embodiments of the present application. [Figure 3] 1 is a structural schematic diagram of a battery cell according to some embodiments of the present application; [Figure 4] 1 is a structural cross-sectional view of a battery cell according to some embodiments of the present application. [Figure 5] FIG. 1 is an exploded view of a battery cell according to some embodiments of the present application. [Figure 6] FIG. 1 is a top view of a casing body assembly according to some embodiments of the present disclosure. [Figure 7] 1 is a cross-sectional view of a battery cell according to some embodiments of the present application. [Figure 8] FIG. 8 is an enlarged view of a portion A in FIG. [Figure 9] FIG. 8 is an enlarged view of a partial area in FIG. [Figure 10] 1 is an enlarged view of a portion of a cross-sectional view of a battery cell according to some embodiments of the present application, where the mounting hole includes a first hole section and a second hole section. [Figure 11] 1 is an enlarged view of a portion of a cross-sectional view of a battery cell according to some embodiments of the present disclosure, where the mounting hole includes a first hole section, a second hole section, and a third hole section. [Figure 12]1 is an enlarged view of a portion of a cross-sectional view of a battery cell according to some embodiments of the present application, where the mounting hole includes a first hole section, a second hole section, a third hole section, and a fourth hole section. [Figure 13] FIG. 2 is an enlarged view of a region of a cross-sectional view of a battery cell according to some embodiments of the present application. [Figure 14] FIG. 7 is an enlarged view of a portion B in FIG. [Figure 15] 1 is a cross-sectional view of a battery cell according to some embodiments of the present application. [Figure 16] FIG. 16 is an enlarged view of a portion C in FIG. [Figure 17] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 18] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 19] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 20] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 21] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 22] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0043] The following detailed description will be given of the embodiments of the technical solution of the present application in conjunction with the accompanying drawings. The following embodiments are merely used as examples to more clearly explain the technical solution of the present application, and cannot limit the scope of the claims of the present application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. The terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the present application. The terms "comprises" and "includes" and any variations thereof in the specification, claims, and description of the drawings of this application are intended to cover a non-exclusive inclusion.

[0045] In the description of the embodiments of the present application, technical terms such as "first", "second", etc. are merely used to distinguish different objects, but should not be understood as indicating or implying relative importance, or the quantity, specific order, and priority relationship of the indicated technical features. In the description of the embodiments of the present application, "plurality" means two or more, unless otherwise clearly and specifically limited.

[0046] The term "embodiment" as used herein means that the specific feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will understand, both explicitly and implicitly, that the embodiments described herein can be combined with other embodiments.

[0047] In the description of the embodiments of the present application, the term "and / or" is simply a relation that describes related objects and indicates that three types of relations can exist. For example, A and / or B can represent three cases: the presence of only A, the simultaneous presence of A and B, and the presence of only B. In addition, the symbol " / " in this specification generally indicates that the related objects before and after it are in an "or" relationship.

[0048] In describing the embodiments of the present application, the term "plurality" refers to two or more (including two); similarly, "multiple sets" refers to two or more sets (including two sets); and "multiple sheets" refers to two or more (including two sheets).

[0049] In describing the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center," "longitudinal direction," "lateral direction," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial direction," "radial direction," and "circumferential direction" are orientations or positional relationships shown based on the drawings, and are intended merely to simplify the explanation and description of the embodiments of the present application. They do not indicate or imply that the devices or elements shown necessarily have a specific orientation, are configured, or must operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present application.

[0050] In describing the embodiments of the present application, unless otherwise clearly specified or limited, technical terms such as "attached," "coupled," "connected," and "fixed" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or integration, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, internal communication between two elements, or an interactive relationship between two elements. Those skilled in the art will be able to understand the specific meanings of the above terms in the embodiments of the present application according to specific circumstances.

[0051] Judging from the current market development, the application of power batteries will become more and more widespread. Power batteries are not only applied to energy storage power systems such as hydroelectric power generation, thermal power generation, wind power generation and solar power generation, but also widely used in electric transportation such as electric bicycles, electric motorcycles and electric cars, as well as in multiple fields such as military equipment and aerospace. As the application fields of power batteries continue to expand, their market demand will also continue to increase.

[0052] A battery cell is generally provided with an explosion-proof valve for releasing the internal pressure of the battery cell when the internal pressure or temperature of the battery cell reaches a threshold value.

[0053] The casing of a battery cell in the related art includes a casing body having a chamber and an opening for accommodating an electrode assembly, and a casing cover for sealing the opening. An installation hole is installed in the casing cover, and an explosion-proof valve is installed in the installation hole. When the internal pressure or temperature of the battery cell reaches a threshold, the explosion-proof valve can be broken through, thereby connecting the inside and outside of the battery cell and achieving the purpose of releasing pressure in the battery cell.

[0054] However, because the structural dimensions of the casing cover are relatively small, if mounting holes are provided in the casing cover, this reduces the structural strength of the casing cover and is likely to affect the protective effect of the casing cover on the inside of the battery cell. Furthermore, if the pressure inside the battery cell is relatively large, the casing cover is more likely to deform, reducing the reliability of the battery cell.

[0055] In order to improve the reliability of the battery cells, the present application installs mounting holes in the casing body, and the volume of the casing body is larger than the volume of the casing cover. Compared to the related art, the present application installs the mounting holes in the casing body, so the proportion of the space occupied by the mounting holes in the casing body is relatively small, and the impact of the mounting holes on the structural strength of the casing body is relatively small.

[0056] In addition, in this application, the electrode posts and mounting holes are installed on the same wall of the casing body so that the electrode posts are installed close to the mounting holes, thereby making it possible to use the electrode posts to reinforce the structural strength of the casing body, making it less likely for the casing body to deform when the pressure inside the battery cells is relatively high, and allowing the pressure to be concentrated on the explosion-proof valve, which then releases pressure from the battery cells.

[0057] The batteries disclosed in the embodiments of the present application can be used as a power source for electrical devices or various energy storage systems that use batteries as energy storage elements. Electrical devices include, but are not limited to, mobile phones, tablets, laptops, electrical toys, power tools, electric scooters, electric vehicles, boats, spacecraft, etc. Electric toys may include stationary or mobile electrical toys, such as game consoles, toy electrical cars, toy electrical boats, and toy electrical airplanes, and spacecraft may include airplanes, rockets, space shuttles, spaceships, etc.

[0058] In the following embodiment, for convenience of explanation, an electric device according to an embodiment of the present invention will be described using a vehicle 1000 as an example.

[0059] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range-extended vehicle, etc. A battery 100 is installed inside the vehicle 1000, and the battery 100 can be installed at the bottom, head, or tail of the vehicle 1000. The battery 100 is used to supply power to the vehicle 1000, for example, the battery 100 can function as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, and the controller 200 controls the battery 100 to supply power to the motor 300, for example, to meet the operating power needs of the vehicle 1000 during starting, navigation, and driving.

[0060] In some embodiments of the present application, the battery 100 is not only used as an operating power source for the vehicle 1000, but can also provide driving power to the vehicle 1000 as a power source for the vehicle 1000, replacing or partially replacing fuel or natural gas.

[0061] Referring to FIG. 2, FIG. 2 is an exploded view of a battery 100 provided according to some embodiments of the present application. The battery 100 includes a case 20 and battery cells 10, which are housed in the case 20. The case 20 is used to provide a housing space for the battery cells 10, and the case 20 can have various structures. In some embodiments, the case 20 may include a first portion 201 and a second portion 202, which cover each other and together define a housing space for housing the battery cells 10. The second part 202 has a hollow structure with one end open, and the first part 201 may have a plate-like structure, with the first part 201 covering the open side of the second part 202 so that the first part 201 and the second part 202 together define the storage space, and the first part 201 and the second part 202 may both have a hollow structure with one end open, with the open side of the first part 201 covering the open side of the second part 202. Of course, the case 20 formed by the first part 201 and the second part 202 may have various shapes such as a cylinder or a rectangular parallelepiped.

[0062] The battery 100 may include multiple battery cells 10, and the multiple battery cells 10 may be connected in series, parallel, or series-parallel. A series-parallel connection refers to multiple battery cells 10 being connected in both series and parallel. The multiple battery cells 10 are connected in direct series, parallel, or series-parallel, and the entire battery cell set is housed in a case 20. Of course, the battery 100 may also be formed by first connecting multiple battery cells 10 in series, parallel, or series-parallel to form a battery module, and then connecting the multiple battery modules in series, parallel, or series-parallel to form the entire battery module housed in the case 20. The battery 100 may include other structures, such as a bus member for achieving electrical connection between the multiple battery cells 10.

[0063] Each battery cell 10 may be a secondary battery or a primary battery, such as, but not limited to, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, and may be cylindrical, flat, rectangular, or have other shapes.

[0064] 3 and 4, Fig. 3 is a structural schematic diagram of a battery cell 10 provided according to some embodiments of the present application, and Fig. 4 is a structural cross-sectional view of the battery cell 10 provided according to some embodiments of the present application. The battery cell 10 includes a casing 11 and an electrode assembly 2. The casing 11 may include a casing body 111 and a casing cover 112.

[0065] The casing cover 112 refers to a member that covers the opening of the casing body 111 so as to isolate the internal environment of the battery cell 10 from the external environment. The shape of the casing cover 112 may be adapted to the shape of the casing body 111 so as to fit into the casing body 111, but is not limited thereto. Alternatively, the casing cover 112 may be made of a material (such as an aluminum alloy) having a certain hardness and strength. In this way, the casing cover 112 is less likely to deform when subjected to pressure or impact, and the battery cell 10 may have higher structural strength and improved reliability.

[0066] The casing cover 112 may be made of various materials such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and is not particularly limited in the embodiments of the present application. In some embodiments, an insulating member may be further installed inside the casing cover 112, and the insulating member may be used to isolate the electrical connection members in the casing body 111 from the casing cover 112 so as to reduce the risk of short circuit. For example, the insulating member may be made of plastic, rubber, etc.

[0067] The casing body 111 is an assembly that fits with the casing cover 112 to form an internal environment for the battery cell 10, which may be used to accommodate the electrode assembly 2, electrolyte, and other components. Functional components such as poles 12 are installed in the casing body 111. The poles 12 may be used to electrically connect with the electrode assembly 2 so as to output or input electrical energy to or from the battery cell 10. An explosion-proof valve 6 is installed in the casing body 111 to release internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold.

[0068] The casing body 111 and the casing cover 112 may be independent components, or an opening 1110 may be provided in the casing body 111, with the casing cover 112 covering the opening 1110 to form the internal environment of the battery cell 10. Without being limited thereto, the casing cover 112 and the casing body 111 may be integrated together, specifically, the casing cover 112 and the casing body 111 may first form a common connection surface before other components are inserted into the casing, and when the interior of the casing body 111 needs to be sealed, the casing cover 112 covers the casing body 111.

[0069] The casing body 111 may have various shapes and dimensions, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism shape, etc. Specifically, the shape of the casing body 111 may be determined according to the specific shape and dimensions of the electrode assembly 2. The material of the casing body 111 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and is not particularly limited in the embodiments of the present application.

[0070] The electrode assembly 2 is a component that initiates an electrochemical reaction in the battery cell 100. The casing body 111 may contain one or more electrode assemblies 2. The electrode assembly 2 is typically formed by winding or stacking positive and negative electrode pieces, with a separator film typically interposed between the positive and negative electrode pieces. The portions of the positive and negative electrode pieces that contain active material constitute active material-coated portions 21, which include positive and negative active material-coated portions. The portions of the positive and negative electrode pieces that do not contain active material constitute conductive portions 22, such as tabs. The tabs include positive and negative tabs, which are located together at one end of the active material-coated portion 21 or at both ends of the active material-coated portion 21. During the charge and discharge process of the battery 100, the active material-coated portions 21 react with the electrolyte, and the conductive portions 22 are connected to the electrode posts 12 to form a current loop.

[0071] As shown in FIGS. 3 and 4 , the battery cell 10 further includes a support 3, an insulating member 4, and an explosion-proof valve 6. The support 3 is provided at one end of the active material coating portion 21. A through-hole 314 is provided in the support 3, and the tab 22 may pass through the through-hole 314 to be connected to the electrode post 12. The insulating member 4 is connected to the support 3 and is wrapped around the electrode assembly 2 in the circumferential direction. The insulating member 4 may be used to isolate the electrical connection members within the casing 11 from the casing 11 to reduce the risk of short circuits. For example, the insulating member 4 may be made of plastic, rubber, or the like. The insulating member 4 and the support 3 may be connected by adhesive or hot-melt, or may be connected by other methods. The casing 11 is provided with an explosion-proof valve 6 for releasing internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold. The explosion-proof valve 6 may be installed in the casing cover 112 or the casing body 111.

[0072] 5 and 6, Fig. 5 is an exploded view of a battery cell 10 according to some embodiments of the present application, and Fig. 6 is a top view of a casing body assembly 101 provided according to some embodiments of the present application. The present application provides a casing body assembly 101 for a battery cell 10. The casing body assembly 101 for a battery cell 10 includes a casing body 111 having an opening 1110, and the casing body 111 includes a mounting wall 114 that points to the wall of the casing body 111, and the mounting hole 115 is drilled through the mounting wall 114 so that the mounting hole 115 communicates with the interior of the casing body 111.

[0073] The casing body assembly 101 of the battery cell 10 further includes an explosion-proof valve 6 provided in the mounting hole 115 and connected to the mounting wall 114, and a pole 12 provided in the mounting wall 114 and spaced apart from the mounting hole 115.

[0074] The explosion-proof valve 6 and the mounting wall 114 may be fixedly or detachably connected, and the explosion-proof valve 6 is installed in the mounting hole 115 to seal and cover the mounting hole 115, isolating the internal environment of the casing body 111 from the external environment. One side of the explosion-proof valve 6 faces the inside of the casing body 111, and this side of the explosion-proof valve 6 is subjected to the internal pressure of the battery cell 10. When the internal pressure of the battery cell 10 is higher than a threshold, the internal pressure of the battery cell 10 can break through the explosion-proof valve 6, allowing the inside of the casing body 111 to communicate with the external environment and releasing the pressure of the battery cell 10. The installation of the explosion-proof valve 6 improves the safety of the use of the battery cell 10 and reduces the possibility of the battery cell 10 exploding.

[0075] The electrode posts 12 are used to electrically connect with the electrode assembly 2 inside the casing body 111 and may be made of metal such as copper or aluminum, or a metal composite. The electrode posts 12 are used to output the electrical energy inside the battery to an external circuit. There are various types of electrode posts 12, including generally cylindrical, rectangular, flat, etc., but this is not limited here. Among them, the electrode posts 12 on the mounting wall 114 may be positive electrode posts 1201 or negative electrode posts 1202, but this is not limited here.

[0076] The mounting holes 115 are provided in the mounting wall 114, and by providing the mounting holes 115, the structural strength of the mounting wall 114 is reduced. By providing the electrode posts 12 in the mounting wall 114, the electrode posts 12 and the mounting holes 115 are spaced apart, which uses the electrode posts 12 to reinforce the structural strength of the mounting wall 114 and further reinforce the structural strength of the casing body 111. This easily improves the protective effect of the casing body 111 on the electrode assembly 2 and makes the mounting wall 114 less likely to deform. As a result, even if the internal pressure of the battery cell 10 is relatively high, the mounting wall 114 is less likely to deform, which makes it easier to maintain a stable pressure on the explosion-proof valve 6 and to control the consistency of the explosion-proof valve 6's explosion pressure.

[0077] Specifically, when the mounting wall 114 deforms, the size of the space within the casing body 111 changes, and at this time the pressure received by the explosion-proof valve 6 also changes. When the casing body 111 deforms to different degrees, the internal pressure of the battery cells 10 breaks through the explosion-proof valve 6 at different pressures. By installing the poles 12 on the mounting wall 114, the poles 12 are used to reinforce the structural strength of the mounting wall 114, making it less likely for the mounting wall 114 to deform and less likely for the size of the space within the casing body 111 to change. This makes it easier to improve the stability of the pressure received by the explosion-proof valve 6 and to easily control the consistency of the explosion pressure of the explosion-proof valve 6.

[0078] Referring to Figure 6, and further to Figures 7 and 8, Figure 7 is a cross-sectional view of a battery cell 10 according to some embodiments of the present application, and Figure 8 is an enlarged view of part A in Figure 7, in which a communication hole 113 is opened through the mounting wall 114, a pole 12 is installed in the communication hole 113, and the pole 12 is connected to the mounting wall 114.

[0079] The fact that the communication hole 113 is opened through the mounting wall 114 means that the communication hole 113 penetrates the mounting wall 114 in the thickness direction and communicates with the inside of the casing body 111. In this way, when the electrode post 12 is installed in the communication hole 113, electrical connection between the electrode post 12 and the electrode assembly 2 inside the casing body 111 is easily achieved. The connection between the electrode post 12 and the mounting wall 114 may be fixed or detachable.

[0080] The through holes 113 are used to avoid connection between the electrode posts 12 and the electrode assemblies 2. When the electrode posts 12 are installed in the through holes 113, the electrode posts 12 and the electrode assemblies 2 are electrically connected to each other at the through holes 113, and the electrode posts 12 can output electrical energy inside the battery cells 10 to an external circuit. The electrode posts 12 are connected to the mounting wall 114, and the electrode posts 12 can reinforce the area of ​​the mounting wall 114 near the through holes 113 and further reinforce the structural strength of the entire mounting wall 114, making the mounting wall 114 less likely to deform.

[0081] Continuing to refer to FIG. 8, the outer peripheral wall of the pole post 12 has an annular groove 128 extending along the circumferential direction thereof, and the annular groove 128 fits onto the hole edge of the communication hole 113.

[0082] The shape of the pole pillar 12 may be cylindrical, the annular groove 128 being located on the side surface of the pole pillar 12 and extending in the circumferential direction of the pole pillar 12, and the projection of the annular groove 128 in the axial direction of the pole pillar 12 being circular, and accordingly the communicating hole 113 being a circular communicating hole 113; the shape of the pole pillar 12 may be elliptical cylindrical, the annular groove 128 being located on the side surface of the pole pillar 12 and extending in the circumferential direction of the pole pillar 12, and the projection of the annular groove 128 in the axial direction of the pole pillar 12 being elliptical, and accordingly the communicating hole 113 being an elliptical communicating hole 113; but of course the shape of the pole pillar 12 may also be a cone, a truncated cone, a cube, etc., and is not limited here.

[0083] The engagement of the annular groove 128 with the edge of the communicating hole 113 firmly fixes the electrode post 12 to the mounting wall 114, preventing the electrode post 12 from easily falling off the mounting wall 114. The engagement of the annular groove 128 with the edge of the communicating hole 113 also restricts the movement of the electrode post 12, reducing the possibility of the electrode post 12 colliding with the edge of the communicating hole 113. This allows the electrode post 12 to be more stably electrically connected to the battery cell 10, enabling the electrode post 12 to stably output electrical energy from the battery cell 10 to an external circuit. The stable fixation of the electrode post 12 in the communicating hole 113 of the mounting wall 114 makes it difficult for the electrode post 12 to fall off the mounting wall 114 even when the pressure inside the battery cell 10 is high or when one side of the electrode post 12 is subjected to pressure, and the electrode post 12 can more stably reinforce the structural strength of the mounting wall 114.

[0084] Referring to FIG. 9, which is an enlarged view of a portion of FIG. 7, the minimum distance L between the edge of the communication hole 113 and the edge of the mounting hole 115 is 1 mm to 30 mm.

[0085] Communicating hole 113 extends along the X direction, and mounting hole 115 extends along the X direction. The distance between the end of communicating hole 113 closest to mounting hole 115 in the X direction and the end of mounting hole 115 closest to communicating hole 113 in the X direction is a minimum distance L, and the value of L is 1 mm to 30 mm. As shown in FIG. 8 , the X direction is the left-right direction, and communicating hole 113 and mounting hole 115 both extend along the left-right direction. When mounting hole 115 is located to the right of communicating hole 113, the distance between the right end of communicating hole 113 and the left end of mounting hole 115 is a minimum distance L, and the value of L is 1 mm to 30 mm. When mounting hole 115 is located to the left of communicating hole 113, the distance between the left end of communicating hole 113 and the right end of mounting hole 115 is a minimum distance L, and the value of L is 1 mm to 30 mm.

[0086] The communication holes 113 and the mounting holes 115 may be formed by a punching press, but of course they may also be formed by other processes and are not particularly limited here.

[0087] In the above technical proposal, in order to prevent electrical continuity between the mounting hole 115 and the connecting hole 113, the distance between the edge of the connecting hole 113 and the edge of the mounting hole 115 is limited to 1 mm or more. This allows a solid area of ​​at least 1 mm to be provided between the mounting hole 115 and the connecting hole 113 in order to reserve a press-fit area for press processing, and further allows the connecting hole 113 and the mounting hole 115 to be easily formed in the mounting wall 114 by processing.

[0088] By limiting the distance between the edge of the communicating hole 113 and the edge of the mounting hole 115 to 30 mm or less, the mounting hole 115 and the communicating hole 113 are not far apart, and by reducing the distance between the mounting hole 115 and the communicating hole 113, after the terminal post 12 is installed in the communicating hole 113, the terminal post 12 can sufficiently reinforce the structural strength of the area of ​​the mounting wall 114 near the communicating hole 113. Because the communicating hole 113 and the mounting hole 115 are not far apart, the terminal post 12 can sufficiently reduce the impact of the mounting hole 115 on the structural strength of the mounting wall 114, so that after the terminal post 12 is installed in the communicating hole 113, the structural strength of the entire mounting wall 114 is sufficiently reinforced.

[0089] The distance between the edge of the communication hole 113 and the edge of the mounting hole 115 at their closest points may be 1 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, or 30 mm.

[0090] Continuing to refer to FIG. 9, and referring to FIG. 10, FIG. 10 is an enlarged view of a portion of a cross-sectional view of a battery cell 10 according to some embodiments of the present application, in which the mounting hole 115 includes a first hole section 1151 and a second hole section 1152 that are aligned and communicate with each other in the thickness direction of the mounting wall 114, the second hole section 1152 being closer to the internal cavity of the casing body 111 than the first hole section 1151, and a first step surface 1161 being formed between the first hole section 1151 and the second hole section 1152, and the explosion-proof valve 6 is disposed in the first hole section 1151 and engages with the first step surface 1161.

[0091] The first hole section 1151 communicates with the second hole section 1152, and the hole diameter of the first hole section 1151 is larger than the hole diameter of the second hole section 1152 so that a first step surface 1161 can be formed between the first hole section 1151 and the second hole section 1152. When the explosion-proof valve 6 is placed in the mounting hole 115, the first step surface 1161 can support the position of the explosion-proof valve 6 so that the explosion-proof valve 6 is installed on one side of the electrode assembly 2.

[0092] The explosion-proof valve 6 is installed on the mounting wall 114 of the casing body 111, and the electrode assembly 2 is installed inside the casing body 111. The mounting wall 114 has a predetermined thickness. The second hole 1152 separates the space between the first hole 1151 and the interior of the casing body 111. After the explosion-proof valve 6 is installed on the first step surface 1161, the explosion-proof valve 6 and the components inside the casing body 111 are separated by at least the first hole 1151. When the air pressure inside the battery cell 10 increases, gas can be collected in the first hole 1151 and directly apply pressure from the first hole 1151 to the explosion-proof valve 6. When the air pressure inside the battery cell 10 exceeds a threshold, the air pressure can burst the explosion-proof valve 6, thereby realizing the pressure release of the battery cell 10.

[0093] By installing the first hole 1151 and the second hole 1152, the gas can be collected in the first hole 1151, which can easily reduce the air pressure in other areas of the casing body 111 caused by the gas, and the gas can be collected on one side of the explosion-proof valve 6, making full use of the explosion-proof valve 6 to easily release the pressure in the battery cell 10.

[0094] In addition, since the explosion-proof valve 6 and the internal components of the casing body 111 are separated by at least the first hole step 1151, maintaining a distance between the explosion-proof valve 6 and the internal components of the casing body 111 easily reduces the possibility of the explosion-proof valve 6 rubbing against the internal components of the casing body 111.

[0095] Referring to FIG. 11, FIG. 11 is an enlarged view of a portion of a cross-sectional view of a battery cell 10 according to some embodiments of the present application, in which the mounting hole 115 further includes a third hole section 1153 communicating with the end of the first hole section 1151 opposite the second hole section 1152, a second step surface 1162 is formed between the first hole section 1151 and the third hole section 1153, the explosion-proof valve 6 is welded to the mounting wall 114 to form a welded seam, and the third hole section 1153 is used to accommodate the welded seam.

[0096] The first hole section 1151 is located between the second hole section 1152 and the third hole section 1153, and the first hole section 1151, the second hole section 1152, and the third hole section 1153 are connected to each other. The explosion-proof valve 6 is supported on the first step surface 1161, and the explosion-proof valve 6 is located in the first hole section 1151 and is welded to the hole edge of the first hole section 1151. When the explosion-proof valve 6 is supported on the first step surface 1161, there is a joint between the explosion-proof valve 6 and the hole edge of the first hole section 1151.

[0097] The seam between the explosion-proof valve 6 and the edge of the first hole section 1151 can be welded by laser welding, ultrasonic welding, welding rod welding, etc., and thus a welded seam is formed between the explosion-proof valve 6 and the first hole section 1151. When welding the explosion-proof valve 6 and the mounting wall 114 together, welding may be performed from the space opposite to the inside of the casing 11 of the explosion-proof valve 6, or from the side facing the inside of the casing 11 of the explosion-proof valve 6, and is not particularly limited here.

[0098] For example, when the explosion-proof valve 6 and the edge of the first hole section 1151 are welded together by welding rod welding, the "weld seam" here refers to a seam formed by melting and connecting the welding rod and the metal of the seam using the high temperature of the welding heat source, and after the metal of the weld seam has cooled, the explosion-proof valve 6 and the mounting wall 114 are integrally connected.

[0099] The first step surface 1161 can preliminarily position the explosion-proof valve 6. After the explosion-proof valve 6 is supported by the first step surface 1161, the explosion-proof valve 6 can be easily welded to the hole edge of the first hole step 1151 to stably fix the explosion-proof valve 6 to the mounting wall 114.

[0100] When the explosion-proof valve 6 and the mounting wall 114 are welded together, the weld seam that is formed protrudes from the explosion-proof valve 6, and the third hole section 1153 can reserve space for the weld seam in advance. In this way, when installing components on the mounting wall 114, the possibility of the components rubbing against the weld seam can be reduced so as to protect the components and the weld seam, and the weld seam can stably connect the explosion-proof valve 6 and the mounting wall 114 so that the explosion-proof valve 6 is stably fixed to the mounting wall 114.

[0101] Referring to FIG. 10, the thickness of the explosion-proof valve 6 extends along the Z direction, and the explosion-proof valve 6 is installed in the first hole section 1151, and the depth of the first hole section 1151 along the Z direction is greater than the thickness of the explosion-proof valve 6. In this way, when the explosion-proof valve 6 is welded and fixed to the mounting wall 114, the first hole section 1151 can also reserve space for the weld seam.

[0102] Continuing to refer to FIG. 11, the casing body assembly 101 further includes a protection sheet 14 for covering the explosion-proof valve 6, provided on the opposite side to the second hole section 1152 of the explosion-proof valve 6.

[0103] Among them, the protective sheet 14 may have a plate-like structure or a film-like structure, and is not particularly limited here.

[0104] The protective sheet 14 covers the explosion-proof valve 6, isolating the explosion-proof valve 6 from the external environment, and provides dust protection while reducing the area where the explosion-proof valve 6 comes into contact with the outside air, thus easily slowing down the rate at which the explosion-proof valve 6 oxidizes.

[0105] Wherein, the protective sheet 14 is installed on the opposite side of the second hole section 1152 of the explosion-proof valve 6, and the protective sheet 14 is located on one side of the third hole section 1153, and the protective sheet 14 is supported by the mounting wall 114, and the third hole section 1153 is located between the protective sheet 14 and the explosion-proof valve 6, and the third hole section 1153 reserves space for the weld seam in advance, easily reducing the possibility of the protective sheet 14 coming into contact with the weld seam, and further easily protecting the protective sheet 14 and reducing the possibility of the weld seam piercing the protective sheet 14.

[0106] Referring to Figure 12, Figure 12 is an enlarged view of a portion of a cross-sectional view of a battery cell 10 according to some embodiments of the present application, in which the mounting hole 115 further includes a fourth hole section 1154 communicating with the end of the third hole section 1153 opposite the first hole section 1151, and a third step surface 1163 is formed between the fourth hole section 1154 and the third hole section 1153, and the protective sheet 14 is provided on the fourth hole section 1154 and engages with the third step surface 1163.

[0107] The hole diameter of the fourth hole step 1154 is larger than the hole diameter of the third hole step 1153 so that a third step surface 1163 can be formed between the third hole diameter and the fourth hole diameter, and the third step surface 1163 is used to support the position of the protective sheet 14.

[0108] The protective sheet 14 is supported by the third step surface 1163, so that the protective sheet 14 is installed on the opposite side to the inside of the casing body 111 of the explosion-proof valve 6, and the protective sheet 14 can further isolate the explosion-proof valve 6 from the external environment and provide dust protection. The protective sheet 14 is installed in the fourth hole section 1154, which reserves space for the installation of the protective sheet 14, so that the protective sheet 14 can be installed in the mounting hole 115. This reduces the volume of the protective sheet 14 exposed from the mounting hole 115, protects the protective sheet 14, and further reduces the possibility of items in the external environment rubbing against the protective sheet 14.

[0109] Continuing to refer to FIG. 12, the depth of the mounting hole 115 extends in the vertical direction. The mounting hole 115 includes, from top to bottom, a fourth hole section 1154, a third hole section 1153, a first hole section 1151, and a second hole section 1152. The hole diameters of the fourth hole section 1154, the third hole section 1153, the first hole section 1151, and the second hole section 1152 decrease in order, thereby defining a third step surface 1163, a second step surface 1162, and a first step surface 1161 in order. The explosion-proof valve 6 is supported by the first step surface 1161, and the explosion-proof valve 6 is located on the first hole section 1151. The protective sheet 14 is supported by the third step surface 1163, and the protective sheet 14 is located on the fourth hole section 1154.

[0110] The second hole section 1152 separates the space between the first hole section 1151 and the inside of the casing body 111. After the explosion-proof valve 6 is installed on the first step surface 1161, the explosion-proof valve 6 and the internal components of the casing body 111 are separated by at least the first hole section 1151. In this way, when the air pressure inside the battery cell 10 increases, gas can be collected in the first hole section 1151, and the gas can directly apply pressure from the first hole section 1151 to the explosion-proof valve 6. When the air pressure inside the battery cell 10 exceeds a threshold, the air pressure can destroy the explosion-proof valve 6, thereby realizing the pressure release of the battery cell 10.

[0111] When the explosion-proof valve 6 and the mounting wall 114 are welded together, the weld seam that is formed protrudes from the explosion-proof valve 6, and the third hole section 1153 can reserve space for the weld seam in advance. In this way, when installing components on the mounting wall 114, the possibility of the components rubbing against the weld seam can be reduced so as to protect the components and the weld seam, and the weld seam can stably connect the explosion-proof valve 6 and the mounting wall 114 so that the explosion-proof valve 6 is stably fixed to the mounting wall 114.

[0112] 13, which is an enlarged view of a portion of a cross-sectional view of a battery cell 10 according to some embodiments of the present application. The explosion-proof valve 6 is installed in the mounting hole 115, and the explosion-proof valve 6 is welded to the edge of the mounting hole 115 and welded to the mounting wall 114. The explosion-proof valve 6 can seal the mounting hole 115. When the internal pressure of the battery cell 10 is higher than a threshold, the air pressure inside the battery cell 10 can break through the explosion-proof valve 6. At this time, the inside and outside of the battery cell 10 are connected to each other through the communication hole 113, thereby achieving the purpose of releasing the pressure in the battery cell 10.

[0113] The depth of the mounting hole 115 extends in the vertical direction, and the thickness of the explosion-proof valve 6 extends in the vertical direction. The depth of the mounting hole 115 is greater than the thickness of the explosion-proof valve 6. After the explosion-proof valve 6 is installed in the mounting hole 115 in this way, a portion of the space below the mounting hole 115 may be reserved in advance, or a portion of the space above the mounting hole 115 may be reserved in advance.

[0114] The space reserved in advance below the mounting hole 115 is located between the explosion-proof valve 6 and the components inside the casing 11; in this way, when the air pressure inside the battery cell 10 increases, the gas can be collected below the explosion-proof valve 6, and the gas can directly apply pressure to the explosion-proof valve 6 from below. When the air pressure inside the battery cell 10 exceeds a threshold, the air pressure can break the explosion-proof valve 6, thereby realizing the pressure release of the battery cell 10.

[0115] The space reserved above the mounting hole 115 can reserve space in advance for the weld seam formed when the explosion-proof valve 6 and the mounting wall 114 are welded together. In this way, when installing a component on the mounting wall 114, the possibility of the component rubbing against the weld seam can be reduced so as to protect the component and the weld seam, and the weld seam can stably connect the explosion-proof valve 6 and the mounting wall 114 so as to stably fix the explosion-proof valve 6 to the mounting wall 114.

[0116] Referring to Figure 10 and further to Figure 14, Figure 14 is an enlarged view of part B in Figure 6, in which an exhaust groove 117 is provided on the opposite side of the mounting wall 114 from the internal cavity of the casing body 111, the exhaust groove 117 communicating with the mounting hole 115, and the protective sheet 14 covering a part of the exhaust groove 117.

[0117] After the protective sheet 14 is installed on the mounting wall 114, there is at least a third hole section 1153 between the protective sheet 14 and the explosion-proof valve 6, that is, one side of the protective sheet 14 is the third hole section 1153 and the other side is the external environment, and the exhaust groove 117 is connected to the third hole section 1153 so that the air pressure on both sides of the protective sheet 14 can be balanced. In this way, when the air pressure in the external environment is high or when the air pressure in the third hole section 1153 is high, the possibility of the protective sheet 14 being damaged can be reduced, and the protective sheet 14 can fully protect the explosion-proof valve 6.

[0118] Optionally, the cross-sectional shape of the exhaust groove 117 is rectangular, trapezoidal, or triangular.

[0119] The cross-sectional shapes of different regions of the exhaust groove 117 may be different, and the cross-sectional shape and dimensions of the exhaust groove 117 may be determined according to actual needs and the dimensions of the mounting wall 114, etc., and are not particularly limited here.

[0120] 15 and 16, FIG. 15 is a cross-sectional view of a battery cell 10 according to some embodiments of the present application, and FIG. 16 is an enlarged view of a portion C in FIG. 15, in which the cross section of the exhaust groove 117 is triangular.

[0121] Continuing to refer to FIGS. 13 and 14, the explosion-proof valve 6 is an integrally molded product, and the explosion-proof valve 6 has a reduced thickness portion 61.

[0122] By performing a process such as laser cutting or numerically controlled pressing on the surface of the explosion-proof valve 6, the thickness of a portion of the explosion-proof valve 6 is reduced to form a reduced-thickness portion 61. The thickness of the reduced-thickness portion 61 may be determined depending on the pressure to which the explosion-proof valve 6 is subjected.

[0123] When the air pressure inside the battery cell 10 exceeds a threshold, the air pressure will destroy the thickness-reduced portion 61 first, and then destroy the explosion-proof valve 6, connecting the inside of the battery cell 10 to the external environment and realizing pressure release to the battery cell 10.

[0124] Optionally, the explosion-proof valve 6 is of split construction.

[0125] The explosion-proof valve 6 having a separate structure means that the explosion-proof valve 6 is made up of multiple components that cooperate to form the explosion-proof valve 6. The structural strength of the area where the components cooperate is relatively low, and when the air pressure inside the battery cell 10 exceeds a threshold, the air pressure will destroy the area where the components cooperate, and further destroy the explosion-proof valve 6, connecting the inside of the battery cell 10 with the external environment and realizing pressure relief for the battery cell 10.

[0126] Optionally, one electrode post 12 is provided on the mounting wall 114, and the electrode post 12 and the explosion-proof valve 6 are arranged at an interval in the longitudinal direction of the mounting wall 114. The electrode post 12 on the mounting wall 114 may be a positive electrode post 1201 or a negative electrode post 1202.

[0127] The length of the mounting wall 114 extends along the X direction, and the terminal post 12 and the explosion-proof valve 6 are installed at a distance in the X direction. Both the terminal post 12 and the explosion-proof valve 6 are installed on the mounting wall 114, so that the terminal post 12 can be used to reduce the impact of the mounting hole 115 on the structural strength of the mounting wall 114. In addition, the terminal post 12 and the explosion-proof valve 6 are installed at a distance in the X direction so that the terminal post 12 and the explosion-proof valve 6 are installed at appropriate positions on the mounting wall 114, which easily reduces the probability of the terminal post 12 and the explosion-proof valve 6 affecting each other.

[0128] Optionally, at least two electrode posts 12 are provided on the mounting wall 114, and the at least two electrode posts 12 are spaced apart in the longitudinal direction of the mounting wall 114, and the explosion-proof valve 6 is located between the two electrode posts 12. The multiple electrode posts 12 on the mounting wall 114 may all be positive electrode posts 1201, all may be negative electrode posts 1202, or some may be positive electrode posts 1201 and some may be negative electrode posts 1202.

[0129] The explosion-proof valve 6 is located between the two poles 12, and after the poles 12 are installed in the communication hole 113, the two poles 12 are located on both sides of the mounting hole 115, thereby reinforcing the structural strength of the area surrounding the mounting hole 115 in the mounting wall 114 from both sides of the mounting hole 115, and further, sufficiently reducing the impact of the mounting hole 115 on the structural strength of the mounting wall 114, making it easy to sufficiently reinforce the structural strength of the mounting wall 114.

[0130] Referring to FIG. 6, two poles 12 are provided on a mounting wall 114, the mounting wall 114 extends in the left-right direction, the two poles 12 and the explosion-proof valve 6 are spaced apart in the left-right direction, the explosion-proof valve 6 is located between the two poles 12, two communication holes 113 are provided on the mounting wall 114, the two poles 12 are installed in the communication holes 113 in one-to-one correspondence, and when the communication holes 113 and the mounting holes 115 are machined in the mounting wall 114, the communication holes 113 and the mounting holes 115 are mounted. The holes 113 and the mounting holes 115 are installed at intervals along the length of the wall 114, which on the one hand facilitates processing, reduces the number of situations in which the communicating holes 113 and the mounting holes 115 are connected, and makes processing less difficult; on the other hand, by easily installing the communicating holes 113 and the mounting holes 115 at appropriate positions on the mounting wall 114, the structural strength of the mounting wall 114 is improved as much as possible, and a certain distance is maintained between the communicating holes 113 and the mounting holes 115, reducing the possibility that the structural strength of local areas of the mounting wall 114 will be too low.

[0131] The explosion-proof valve 6 is located between the two poles 12, and after the poles 12 are installed in the communication hole 113 in this manner, the two poles 12 are located on both sides of the mounting hole 115, thereby reinforcing the structural strength of the area of ​​the mounting wall 114 near the mounting hole 115 from both sides of the mounting hole 115, and further, sufficiently reducing the effect of the mounting hole 115 on the structural strength of the mounting wall 114, making it easy to sufficiently reinforce the structural strength of the mounting wall 114.

[0132] Referring to FIG. 5, the mounting wall 114 is located on a wall of the casing body 111 facing the opening 1110 .

[0133] When the mounting wall 114 and the opening 1110 are installed opposite each other, i.e., when the opening 1110 is located at the bottom of the casing body 111, the upper wall surface of the casing body 111 is formed as the mounting wall 114; when the opening 1110 is provided on the left wall of the casing body 111, the right wall of the casing body 111 is formed as the mounting wall 114; and when the opening 1110 is provided on the front wall of the casing body 111, the rear wall of the casing body 111 is formed as the mounting wall 114.

[0134] The mounting wall 114 is located on a wall opposite the opening 1110 of the casing body 111, so that when the electrode assembly 2 is mounted in the casing body 111, the electrode post 12 on the mounting wall 114 and the electrode assembly 2 can be easily positioned directly opposite each other, and further, when the electrode assembly 2 is mounted in a predetermined position, the electrode post 12 can be easily electrically connected to the electrode assembly 2.

[0135] Referring to FIG. 5, the present application further provides a battery cell 10 including a casing body assembly 101 of any one of the technical solutions described above, an electrode assembly 2 disposed within the casing body 111 and including an active material application portion 21 and a conductive portion 22 connected to the active material application portion 21 and electrically connected to the electrode post 12, and a casing cover 112 covering the opening 1110 to seal the electrode assembly 2 within the casing body 111.

[0136] By installing the pole 12 on the mounting wall 114 of the casing body 111, the pole 12 is used to increase the structural strength of the mounting wall 114, making the mounting wall 114 less likely to deform, thereby improving the protective effect of the casing body 111 on the electrode assembly 2 and making it easier to control the consistency of the explosion pressure of the explosion-proof valve 6.

[0137] Referring to Fig. 5 and further to Figs. 17 and 18, Fig. 17 is a schematic cross-sectional view of a battery cell 10 according to some embodiments of the present application. Fig. 18 is a schematic cross-sectional view of a battery cell 10 according to some embodiments of the present application. The mounting wall 114 is located on a wall facing the opening 1110 of the casing body 111, and the pole 12 is provided with a receiving portion 121, and at least a portion of the conductive portion 22 extends and is received in the receiving portion 121, so that the conductive portion 22 is electrically connected to the pole 12. In other words, the pole 12 is installed as a hollow structure.

[0138] Here, "at least a portion" means that the conductive part 22 is completely housed within the housing 121, or that only a portion of the conductive part 22 is housed within the housing 121. Because the housing 121 is provided on the pole 12, the hollow structure of the housing 121 can, on the one hand, reduce the weight of the pole 12 to a certain extent and improve the weight-energy density of the battery cell 10 and the battery 100; on the other hand, since the conductive part 22 is housed within the housing 121, the assembly efficiency of the conductive part 22 can be improved and the space occupied by the conductive part 22 can be saved, and the space of the battery cell 10 can be fully utilized, which is advantageous for making the structure of the battery cell 10 compact and improving the energy density of the battery cell 10.

[0139] More specifically, by accommodating a part or all of the conductive portion 22 in the accommodation portion 121, the portion of the conductive portion 22 located in the accommodation portion 121 can occupy space within the electrode post 12, thereby reducing the space occupied by the conductive portion 22 within the casing 11. When the dimensions of the casing 11 are fixed, it is possible to accommodate a larger-sized active material-coated portion 21 and save some space within the casing 11 to improve the volumetric energy density of the battery cell 10. For example, when the conductive portion 22 is pulled out from the side of the active material-coated portion 21 closest to the electrode post 12, the space occupied by the conductive portion 22 between the active material-coated portion 21 and the electrode post 12 can be saved. This allows the dimension of the active material-coated portion 21 in the pulling direction of the conductive portion 22 to be increased, reducing the gap between the active material-coated portion 21 and the electrode post 12, thereby improving the energy density of the battery cell 10.

[0140] At the same time, by accommodating at least a portion of the conductive portion 22 in the accommodating portion 121, the space occupied by the battery cell 10 itself can be reduced, so that a battery 100 of the same volume can accommodate more battery cells 10, and the volumetric energy density of the battery 100 can also be improved. Furthermore, by accommodating at least a portion of the conductive portion 22 in the accommodating portion 121 to occupy space within the pole 12, the redundancy of the conductive portion 22 within the casing 11 can be reduced to at least some extent, reducing the probability of a short circuit between the conductive portion 22 and the active material coating portion 21 and the battery cell 10, thereby reducing the probability of a short circuit within the battery cell 10, and improving the reliability and stability of the operation of the battery cell 10 and the battery 100.

[0141] It should be noted that in the embodiment of the present application, the location of the accommodating portion 121 can be located not only on the side facing the active material coated portion 21 of the pole 12 but also on the side opposite to the active material coated portion 21 of the pole 12.

[0142] For example, referring again to Figures 17 and 18, when the accommodating portion 121 is located on the side facing the active material application portion 21 of the pole 12, the accommodating portion 121 includes a first accommodating groove 12110, the surface of the pole 12 facing the active material application portion 21 is the pole inner end face 122, the groove opening of the first accommodating groove 12110 is formed in the pole inner end face 122, and at least a portion of the conductive portion 22 is accommodated in the first accommodating groove 12110.

[0143] For example, the first accommodating groove 12110 is a groove body, and the groove body has a groove-like structure with a certain depth. For example, when the electrode post 12 is installed on the upper end wall of the casing 11 and the electrode post inner end surface 122 is the lower surface of the electrode post 12, the first accommodating groove 12110 is formed as an accommodating groove with a groove opening downward and groove walls recessed upward. For example, when the electrode post 12 is installed on the lower end wall of the casing 11 and the electrode post inner end surface 122 is the upper surface of the electrode post 12, the first accommodating groove 12110 is formed as an accommodating groove with a groove opening upward and groove walls recessed downward.

[0144] In the above technical solution, on the one hand, by forming the first accommodating groove 12110 in the pole 12, the weight of the pole 12 can be reduced to a certain extent, thereby improving the weight-energy density of the battery cell 10 and the battery 100. On the other hand, because the groove opening of the first accommodating groove 12110 is formed in the pole inner end surface 122, which is the surface adjacent to the active material applied portion 21 of the pole 12, the first accommodating groove 12110 can open toward the active material applied portion 21, and the conductive portion 22 can easily extend into the first accommodating groove 12110, improving assembly efficiency. Furthermore, the first accommodating groove 12110 of this type is easy to process, improving manufacturing efficiency.

[0145] Furthermore, the first accommodating groove 12110 can be easily processed to have a larger volume and can accommodate more conductive parts 22. At the same time, since the first accommodating groove 12110 opens toward the active material application portion 21, the first accommodating groove 12110 can be used as a buffering and temporary storage structure for the electrolyte. The casing 11 can accommodate more electrolyte. Since the electrolyte is consumed during the charging and discharging process of the battery cell 10, an increase in the amount of electrolyte can extend the service life of the battery cell 10. Furthermore, since the first accommodating groove 12110 opens toward the active material application portion 21, the first accommodating groove 12110 can also be used as a buffering structure for gas generated inside the electrode assembly 2, which can reduce the expansion of the battery cell 10 and improve the reliability and stability of the battery cell 10.

[0146] Furthermore, since the first accommodating groove 12110 is located inside the pole 12, external foreign objects and impurities are less likely to enter the first accommodating groove 12110, which reduces the impact of external foreign objects and impurities on the electrode assembly 2, improving the stability and reliability of the operation of the electrode assembly 2 and further improving the stability and reliability of the battery cell 10 and the battery 100.

[0147] 17 again, in the embodiment of the present application, the method of connecting the terminal post 12 and the casing 11 is not limited and may be, for example, welding or riveting. For example, when the two are fitted together by riveting, the casing 11 has a through hole 113, and the terminal post 12 is attached to the through hole 113 by riveting. Of course, as will be understood, when the two are fitted together by welding or another method, the casing 11 may be provided with a through hole 113 so that the terminal post 12 can be easily attached to the casing 11 through the through hole 113, and this is not limited here.

[0148] At the same time, the first accommodating groove 12110 may be disposed corresponding to the position of the communicating hole 113. In other words, the orthogonal projection of the first accommodating groove 12110 is located within the orthogonal projection range of the communicating hole 113 on a projection plane perpendicular to the axial direction R of the terminal post 12. Therefore, the first accommodating groove 12110 can have a large depth to accommodate more conductive parts 22, and further, the space occupied by the conductive parts 22 in the casing 11 can be significantly reduced. Specifically, when the casing 11 is provided with the communicating hole 113 and the terminal post 12 is attached to the communicating hole 113, the depth H1 of the first accommodating groove 12110 along the axial direction R of the terminal post 12 is equal to or greater than the minimum distance H2 from the terminal post inner end surface 122 to the communicating hole 113.

[0149] It should be noted that the specific shape of the first receiving groove 12110 is not limited, and may be a regular or irregular shape, such as a cylindrical groove having a rectangular, elliptical, or racetrack cross section, a trapezoidal groove having a rectangular cross section with gradually varying cross-sectional dimensions, a hemispherical groove having a circular cross section with gradually varying cross-sectional dimensions, a semi-elliptical groove having an elliptical cross section with gradually varying 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 post 12.

[0150] In the axial direction R of the electrode post 12, the depth H1 of the first accommodating groove 12110 is equal to or greater than the minimum distance H2 from the electrode post inner end surface 122 to the communicating hole 113. This allows the volume of the electrode post 12 to be fully utilized, making the first accommodating groove 12110 deeper, which is advantageous for accommodating more conductive parts 22 and significantly reducing the space occupied by the conductive parts 22 in the casing 11, further improving the energy density of the battery cell 10 and further reducing the redundancy of the conductive parts 22 in the casing 11. At the same time, the first accommodating groove 12110 has a relatively deep depth, which can accommodate gas generated by the electrode assembly 2 and improve the reliability and stability of the battery cell 10. It can also accommodate more electrolyte, thereby extending the service life of the battery cell 10.

[0151] Referring again to Figures 17 and 18, in order to improve the stability and reliability of the electrical connection between the active material application portion 21 and the electrode post 12, in some embodiments of the present application, the electrical connection position between the conductive portion 22 and the electrode post 12 may be located on the groove wall of the first accommodating groove 12110 formed by the accommodating portion 121.

[0152] For example, the conductive portion 22 and the terminal post 12 may be electrically connected by welding, and the electrical connection position is the weld position between the conductive portion 22 and the terminal post 12. At the same time, the welding method between the conductive portion 22 and the terminal post 12 is not limited, and may be, for example, laser welding. Depending on factors such as the position, angle, or structure of the welded portion, vertical welding, inclined welding, lap welding, edge welding, etc. may be selected. In other embodiments of the present application, the conductive portion 22 and the terminal post 12 may be electrically connected by other methods instead of welding, such as by installing a conductive adhesive or a conductive pin. For simplicity of explanation, the following description will be given taking the example of the conductive portion 22 and the terminal post 12 being electrically connected by welding, and the weld position being the electrical connection position between the conductive portion 22 and the terminal post 12.

[0153] Specifically, the electrode post 12 includes a first end wall 12111 and a first side wall 12113, the first end wall 12111 being located on the opposite side of the first side wall 12113 from the active material coated portion 21, the first end wall 12111 and the first side wall 12113 surrounding each other forming a first accommodating groove 12110, and the electrically connecting position between the conductive portion 22 and the electrode post 12 being located on the first end wall 12111 and / or the first side wall 12113. In other words, the conductive portion 22 may be welded to at least one of the first end wall 12111 and the first side wall 12113.

[0154] In the above technical solution, by locating the electrical connection position between the conductive portion 22 and the pole 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 receive at least a portion of the conductive portion 22, but also the groove wall of the first receiving groove 12110 serves to establish the electrical connection with the conductive portion 22, thereby simplifying the structure of the pole 12, facilitating processing of the pole 12, simplifying the structure of the conductive portion 22, reducing redundancy of the conductive portion 22, and reducing the cost of the conductive portion 22. Furthermore, by utilizing the groove wall of the first receiving groove 12110 to establish the electrical connection with the conductive portion 22, a relatively large electrical connection area between the conductive portion 22 and the pole 12 can be provided, which not only simplifies the difficulty of the electrical connection but also improves the reliability and stability of the electrical connection, thereby further improving the performance of the battery cell 10.

[0155] Furthermore, since the electrical connection position between the conductive portion 22 and the pole 12 is located within the first accommodating groove 12110, not only is it possible to prevent the electrical connection position from protruding outside the pole 12 and occupying space other than the pole 12, but the electrical connection position is protected by the pole 12, thereby improving the reliability and stability of the electrical connection between the conductive portion 22 and the pole 12.

[0156] In addition, in the embodiments of the present application, the first end wall 12111 is configured as a sealed structure without a through hole 12130 in order to isolate the first accommodating groove 12110 from the external space of the casing 11, thereby reducing the problem of the electrolyte in the casing 11 leaking from the first accommodating groove 12110.

[0157] 17 and 18, in some alternative embodiments, the local shape of the conductive portion 22 matches the local shape of the first end wall 12111 and is closely fitted to the first end wall 12111 so that the electrical connection between the conductive portion 22 and the first end wall 12111 extends along the length or width of the first end wall 12111. For example, if the first end wall 12111 is flat, the local portion of the conductive portion 22 is also flat and is bonded to the first end wall 12111, and the bonding position is electrically connected by, for example, welding. This increases the electrical connection area and improves the reliability and stability of the electrical connection.

[0158] Furthermore, when the electrical connection between the conductive portion 22 and the first end wall 12111 is made by welding, the first end wall 12111 is located on the opposite side of the active material application portion 21 of the first accommodating groove 12110, making the welding operation easier, and for example, the electrode post 12 may be welded from the opposite side of the active material application portion 21.

[0159] It should be noted that the shape of the first end wall 12111 is not limited, and may be, for example, a flat plate or an arcuate plate. Whereas, when the first end wall 12111 has a flat structure, the first end wall 12111 is disposed at an angle with respect to the axial direction R of the pole 12, and may be, for example, a flat plate structure perpendicular to the axial direction R of the pole 12, or may be, for example, an inclined plate structure not perpendicular to the axial direction R of the pole 12, but the inclination direction is not limited.

[0160] Of course, in other embodiments of the present application, the electrical connection position between the conductive portion 22 and the first end wall 12111 does not necessarily extend along the length or width of the first end wall 12111, but may be, for example, a plurality of discretely located points, for example, the conductive portion 22 has a plurality of spaced apart portions that are each welded to the first end wall 12111, and the description of these will be omitted here.

[0161] 19 is a schematic cross-sectional view of a battery cell 10 according to some embodiments of the present application. When the conductive portion 22 is electrically connected to the first end wall 12111, a first sunken groove 12112 may be provided in the first end wall 12111, and the sunken direction of the first sunken groove 12112 is opposite to that of the active material coated 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 sunken groove 12112. For example, at least a portion of the conductive portion 22 may be located within the first sunken groove 12112 and connected to a portion of the first end wall 12111 that defines the first sunken groove 12112.

[0162] In the above technical solution, on the one hand, the first sunken groove 12112 can realize pre-positioning and position restriction of the electrical connection position of the conductive part 22, which is advantageous not only for achieving accurate positioning and electrical connection and improving production efficiency, but also for improving the stability and reliability of the conductive part 22 and improving the stability and reliability of the charge and discharge processes of the battery cell 10. On the other hand, by providing the first sunken groove 12112 in the first end wall 12111, the wall thickness of a local part of the first end wall 12111 can be locally reduced, which is not only advantageous for welding, but also for reducing the weight of the electrode post 12 and improving the weight-energy density of the battery cell 10.

[0163] Referring again to Figures 18 and 19, in the embodiment of the present application, a first groove 126 may be further provided on the pole 12 according to needs, and the first groove 126 is located on the opposite side of the pole 12 from the active material application portion 21, i.e., the surface of the pole 12 opposite the active material application portion 21 is the pole outer end surface 123, and the groove opening of the first groove 126 is formed on the pole outer end surface 123.

[0164] As will be understood, the first groove 126 is a groove body, and the groove body has a groove-like structure with a certain depth. When the electrode post 12 is installed on the upper end wall of the casing 11 and the electrode post outer end surface 123 is the upper surface of the electrode post 12, the first groove 126 is formed as a first groove 126 with its groove opening upward and its groove wall recessed downward (i.e., recessed in a square shape adjacent to the electrode assembly 2). Also, when the electrode post 12 is installed on the lower end wall of the casing 11 and the electrode post outer end surface 123 is the lower surface of the electrode post 12, the first groove 126 is formed as a first groove 126 with its groove opening downward and its groove wall recessed upward (i.e., recessed in a square shape opposite to the electrode assembly 2).

[0165] In the above technical solution, on the one hand, the first groove 126 is provided on the pole 12, which further reduces the weight of the pole 12 and improves the weight-to-energy density of the battery cells 10 and the battery 100. On the other hand, the first groove 126 is located on the outside of the pole 12, i.e., it opens toward the opposite side of the pole 12 from the inside of the casing 11. The first groove 126 can be used to accommodate or mount structural members electrically connected to each battery cell 10 in the battery 100, so as to fully utilize the space within the pole 12 and improve the space utilization rate and volumetric energy density of the battery 100.

[0166] Furthermore, by simultaneously providing the first receiving groove 12110 and the first groove 126 on the electrode post 12, the first groove 126 is located on the opposite side of the first receiving groove 12110 from the active material application portion 21, and the first groove 126 opens in the opposite direction from the first receiving groove 12110. This makes it convenient to laser-weld the conductive portion 22 and the first end wall 12111 through the first groove 126 from the outside of the electrode post 12, i.e., from the side opposite the active material application portion 21 of the electrode post 12. This makes it easy to electrically connect the conductive portion 22 and the electrode post 12 by external welding. In other words, the above structure and configuration makes it easy to externally weld the electrode post 12 and the conductive portion 22 through the first groove 126, facilitating the processing and manufacturing of the battery cell 10 and reducing processing and manufacturing costs.

[0167] Furthermore, in order to easily and effectively weld the conductive portion 22 to the groove wall of the first accommodating groove 12110 through the first groove 126 and improve the welding reliability between the conductive portion 22 and the groove wall of the first accommodating groove 12110, in the embodiment of the present application, the portion between the first groove 126 and the first accommodating groove 12110 can be laser welded to the conductive portion 22, that is, the gap portion 127 shown in Figure 19 can be laser welded to the conductive portion 22 to realize an electrical connection between the electrode assembly 2 and the pole 12. The thickness of the spacing portion 127 of the pole post 12 located between the first groove 126 and the first accommodating groove 12110 is relatively thin, and the spacing portion 127 separates the first groove 126 from the first accommodating groove 12110. The wall surface of the spacing portion 127 closest to the active material application portion 21 can be the first end wall 12111. When it is necessary to weld the conductive portion 22 to the first end wall 12111, the relatively thin thickness of the spacing portion 127 is advantageous for realizing welding between the conductive portion 22 and the first end wall 12111 through the first groove 126, improving the convenience and reliability of welding.

[0168] Referring again to FIG. 18 , the battery cell 10 may further include a groove cover 7, which is attached to the electrode post 12 and seals the opening of the first groove 126. In the above technical solution, the groove cover 7 is installed to seal the first groove 126, allowing the electrode post 12 to achieve indirect electrical connection with the bus member via the groove cover 7. The position and structure of the groove cover 7 make the electrical connection between the groove cover 7 and the bus member more convenient and increase the electrical connection area. Therefore, the installation of the groove cover 7 facilitates electrical connection between adjacent battery cells 10 in the battery 100. Furthermore, because the electrical connection positions between the battery cells 10 are located on the groove cover 7, the electrical connection positions between the conductive parts 22 and the electrode post 12 can be separated by the first groove 126, reducing interference between them and further improving the stability and reliability of the battery cell 10.

[0169] For example, refer to Figure 20, which is a schematic local cross-sectional view of a battery cell 10 provided by some embodiments of the present application, where the accommodating portion 121 may be configured to include a second accommodating groove 12120, the surface of the pole 12 opposite the active material coating portion 21 is the pole outer end surface 123, the groove mouth of the second accommodating groove 12120 is formed in the pole outer end surface 123, the second accommodating groove 12120 is connected to the inside of the casing 11 through a through hole 12130, and the conductive portion 22 is inserted into the through hole 12130 and at least a portion of it is accommodated in the second accommodating groove 12120.

[0170] As can be understood, the second accommodating groove 12120 is a groove body, which has a groove-like structure with a certain depth. For example, when the electrode post 12 is installed on the upper end wall of the casing 11 and the electrode post outer end surface 123 is the upper surface of the electrode post 12, the second accommodating groove 12120 is formed as an accommodating groove with an opening facing upward and groove walls recessed downward. Also, when the electrode post 12 is installed on the lower end wall of the casing 11 and the electrode post outer end surface 123 is the lower surface of the electrode post 12, the second accommodating groove 12120 is formed as an accommodating groove with an opening facing downward and groove walls recessed upward.

[0171] 20 again, in the above technical solution, on the one hand, by providing the second accommodating groove 12120 in the electrode post 12, the weight of the electrode post 12 can be reduced to a certain extent, thereby improving the weight-energy density of the battery cell 10 and the battery 100. On the other hand, the groove opening of the second accommodating groove 12120 is formed in the electrode post outer end surface 123, which is the surface opposite the active material coated portion 21 of the electrode post 12, so that the second accommodating groove 12120 can open in the direction away from the active material coated portion 21. In this way, when at least a portion of the conductive portion 22 is accommodated in the second accommodating groove 12120, the groove opening of the second accommodating groove 12120 can facilitate the accommodation and arrangement of the conductive portion 22 and the electrical connection between the conductive portion 22 and the electrode post 12, which further reduces the difficulty of producing the battery cell 10 and improves the production efficiency of the battery cell 10.

[0172] At the same time, since the second accommodating groove 12120 can pass through the through-hole 12130 and communicate with the inside of the casing 11, the second accommodating groove 12120 can be used as a buffering and temporary storage structure for the electrolyte. The casing 11 can accommodate more electrolyte. Since the electrolyte is consumed during the charging and discharging process of the battery cell 10, an increased amount of electrolyte can extend the service life of the battery cell 10. Furthermore, since the second accommodating groove 12120 can pass through the through-hole 12130 and communicate with the inside of the casing 11, the second accommodating groove 12120 can also be used as a buffering structure for the gas generated inside the electrode assembly 2, which can reduce the expansion of the battery cell 10 and improve the reliability and stability of the battery cell 10.

[0173] It should be noted that when the accommodating portion 121 has the second accommodating groove 12120 and the conductive portion 22 is inserted into the through hole 12130 and at least a portion of the conductive portion 22 is accommodated in the second accommodating groove 12120, the electrical connection position between the conductive portion 22 and the electrode post 12 is not limited. For example, when the conductive portion 22 is inserted into the through hole 12130 and at least a portion of the conductive portion 22 is accommodated in the second accommodating groove 12120, in the embodiment of the present application, the electrical connection position between the conductive portion 22 and the electrode post 12 is located at the hole wall of the through hole 12130 formed by the electrode post 12.

[0174] In the above technical solution, the electrical connection position between the conductive part 22 and the electrode post 12 is located on the hole wall of the through hole 12130, which makes it easy to electrically connect the conductive part 22 and the electrode post 12 through the second accommodating groove 12120. Furthermore, when the electrical connection area between the conductive part 22 and the electrode post 12 is relatively large, the electrical connection between the conductive part 22 and the electrode post 12 can be used to seal the through hole 12130, thereby saving on sealing costs and reducing electrolyte leakage, thereby saving on sealing materials.

[0175] Specifically, the conductive part 22 can be welded to the wall of the through hole 12130 at the position where the through hole 12130 connects to the second accommodating groove 12120, making the work easy, and in order to improve the problem of the electrolyte in the casing 11 leaking from the through hole 12130, the through hole 12130 can be sealed by the welding mark and the conductive part 22 by controlling the welding mark.

[0176] Furthermore, for example, when the conductive part 22 is inserted into the through hole 12130 and at least partially accommodated in the second accommodating groove 12120, in some other embodiments of the present application, the electrical connection position between the conductive part 22 and the electrode post 12 can be located on the groove wall of the second accommodating groove 12120 formed by the electrode post 12. This facilitates the electrical connection operation and, for example, when the conductive part 22 is welded to the groove wall of the second accommodating groove 12120 formed by the electrode post 12, prevents conductive particles produced by welding from entering the casing 11 and causing problems such as short circuits.

[0177] Referring again to Figure 20, 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 application portion 21, the second end wall 12121 and the second side wall 12123 surround each other to form a second accommodating groove 12120, a through hole 12130 is opened in the second end wall 12121, and the electrical connection position between the conductive portion 22 and the pole 12 is located in the second end wall 12121 and / or the second side wall 12123.

[0178] More specifically, the conductive portion 22 and the electrode post 12 can be electrically connected by welding, and therefore the welding position is the electrical connection position between the conductive portion 22 and the electrode post 12. In other embodiments of the present application, the conductive portion 22 and the electrode post 12 can be electrically connected by other methods instead of welding, such as by using a conductive adhesive or installing a conductive pin, and the description thereof will be omitted here.

[0179] For ease of explanation, the following description will be given taking as an example that the conductive portion 22 and the electrode post 12 are electrically connected by welding, and the welding position is the electrical connection position between the conductive portion 22 and the electrode post 12. For example, in some embodiments, the electrical connection position between the conductive portion 22 and the electrode post 12 is located on 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.

[0180] In the above technical solution, the electrical connection position between the conductive portion 22 and the electrode post 12 is located on at least one of the second end wall 12121 and the second side wall 12123. This allows the second accommodating groove 12120 to accommodate at least a portion of the conductive portion 22, and the groove wall of the second accommodating groove 12120 to achieve electrical connection with the conductive portion 22, thereby simplifying the structure of the electrode post 12 and facilitating processing of the electrode post 12. Furthermore, the through hole 12130 is formed in the second end wall 12121, allowing the conductive portion 22 to easily pass through the through hole 12130 and extend into the second accommodating groove 12120. This simplifies the structure of the conductive portion 22, reduces redundancy of the conductive portion 22, and reduces the cost of the conductive portion 22. Furthermore, due to the opening direction of the groove opening of the second accommodating groove 12120, the electrical connection operation between the conductive part 22 and the groove wall of the second accommodating groove 12120 can be easily performed through the groove opening of the second accommodating groove 12120, reducing the difficulty of the electrical connection. Furthermore, the electrical connection with the conductive part 22 is realized by using the groove wall of the second accommodating groove 12120, thereby making the electrical connection area between the conductive part 22 and the pole 12 relatively large, improving the reliability and stability of the electrical connection and further improving the performance of the battery cell 10.

[0181] Furthermore, since the electrical connection position between the conductive portion 22 and the pole 12 is located within the second accommodating groove 12120, not only is it possible to prevent the electrical connection position from protruding outside the pole 12 and occupying space other than the pole 12, but the electrical connection position is protected by the pole 12, thereby improving the reliability and stability of the electrical connection between the conductive portion 22 and the pole 12.

[0182] 20 , in some embodiments, the local shape of the conductive portion 22 matches the local shape of the second end wall 12121 and is closely positioned to achieve an electrical connection, such that the electrical connection position between the conductive portion 22 and 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 flat, a local portion of the conductive portion 22 is also flat and is bonded to the second end wall 12121, and the bonding position is electrically connected, for example, by welding. This increases the electrical connection area and improves the reliability and stability of the electrical connection.

[0183] It should be noted that the shape of the second end wall 12121 is not limited, and may be, for example, a flat plate-like structure, an arc-shaped plate-like structure, etc. Wherein, when the second end wall 12121 has a flat plate-like structure, the second end wall 12121 is disposed at an angle with respect to the axial direction R of the pole 12, and may be, for example, a flat plate-like structure perpendicular to the axial direction R of the pole 12, or may be, for example, an inclined plate structure not perpendicular to the axial direction R of the pole 12, but the inclination direction is not limited.

[0184] 20, when the second end wall 12121 has a flat plate-like structure, the angle θ between the second end wall 12121 and the axial direction R of the electrode post 12 is equal to 90°, that is, the second end wall 12121 and the active material coating portion 21 are equidistant from each other along the direction from the through hole 12130 to the second side wall 12123. This facilitates welding of the conductive portion 22 and the second end wall 12121.

[0185] Furthermore, for example, the angle θ between the second end wall 12121 and the axial direction R of the electrode post 12 is greater than 90°. That is, the second end wall 12121 extends obliquely from the through hole 12130 to the second side wall 12123 toward the active material coated portion 21. This increases the extension distance of the conductive portion 22 along the second end wall 12121, improving the reliability of the electrical connection. For example, the angle θ between the second end wall 12121 and the axial direction R of the electrode post 12 is 90°-145°, and may be, for example, 100°, 110°, 120°, 130°, 140°, etc. This, on the one hand, facilitates processing of the second end wall 12121 and electrical connection with the conductive portion 22, and, on the other hand, allows the space within the electrode post 12 to be relatively fully utilized to accommodate the conductive portion 22.

[0186] Furthermore, for example, the angle θ between the second end wall 12121 and the axial direction R of the pole post 12 is less than 90°, that is, the second end wall 12121 extends obliquely in the direction opposite to the active material application portion 21 along the direction from the through hole 12130 to the second side wall 12123.

[0187] This allows the conductive portion 22 to extend a longer distance along the second end wall 12121, improving the reliability of the electrical connection. For example, the angle θ between the second end wall 12121 and the axial direction R of the electrode post 12 is 45° to 90°, and may be, for example, 50°, 60°, 70°, 80°, etc. On the one hand, this makes it easier to process the second end wall 12121 and to electrically connect it to the conductive portion 22, and on the other hand, it allows the space within the electrode post 12 to be relatively fully utilized to accommodate the conductive portion 22.

[0188] Of course, the present invention is not limited to these, and in other embodiments of the present application, the electrical connection position between the conductive portion 22 and the second end wall 12121 does not necessarily extend along the length or width of the second end wall 12121, but may be a plurality of discretely located points, for example, the conductive portion 22 has a plurality of spaced apart portions that are respectively welded to the second end wall 12121, and the description thereof will be omitted here.

[0189] Referring again to FIG. 20 and further to FIG. 21, FIG. 21 is a schematic cross-sectional view of a battery cell 10 according to 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 electrode post 12, in any embodiment of the present application, when the conductive portion 22 is electrically connected to the second end wall 12121, a second sunken groove 12122 can be provided in the second end wall 12121 according to needs. The second sunken groove 12122 is a recessed groove formed by a local portion of the second end wall 12121 sinking into one end adjacent to the active material coated portion 21. At least a portion of the position where the conductive portion 22 is electrically connected to the second end wall 12121 is located within the second sunken groove 12122.

[0190] In the above technical solution, the portion of the conductive part 22 located within the second sunken groove 12122 is installed to fit the shape of the second sunken groove 12122 and is installed closely to achieve electrical connection, so that the second sunken groove 12122 can be used to pre-position and limit the position of the electrical connection position of the conductive part 22, and the electrical connection can be performed with accurate alignment, which is beneficial to improving production efficiency and can improve the stability and reliability of the electrical connection position, thereby improving the reliability and stability of the charging and discharging operations of the battery cell 10.

[0191] 21 again, in the embodiment of the present application, the method of connecting the terminal post 12 and the casing 11 is not limited and may be, for example, welding or riveting. For example, when the two are fitted together by riveting, the casing 11 has a through hole 113, and the terminal post 12 is attached to the through hole 113 by riveting. Of course, as will be understood, when the two are fitted together by welding or another method, the casing 11 may have a through hole 113, and the terminal post 12 is attached to the through hole 113.

[0192] Optionally, referring again to FIG. 20 , the second accommodating groove 12120 may be installed corresponding to the position of the communicating hole 113. In other words, on a projection plane perpendicular to the axial direction R of the pole 12, the orthogonal projection of the second accommodating groove 12120 is located within the orthogonal projection range of the communicating hole 113. This allows the second accommodating groove 12120 to have a relatively large depth and accommodate more conductive parts 22, thereby further significantly reducing the space occupied by the conductive parts 22 in the casing 11.

[0193] In some embodiments, referring again to FIG. 20 , when the casing 11 has a communication hole 113 and the pole 12 is attached to the communication hole 113, the depth H3 of the second accommodating groove 12120 along the axial direction R of the pole 12 is greater than or equal to the minimum distance H4 from the pole outer end face 123 to the communication hole 113.

[0194] It should be noted that the specific shape of the second receiving groove 12120 is not limited and may be a regular or irregular shape, such as a cylindrical groove having a rectangular, elliptical, or racetrack cross section, a trapezoidal groove having a rectangular cross section with gradually varying cross-sectional dimensions, a hemispherical groove having a circular cross section with gradually varying cross-sectional dimensions, a semi-elliptical groove having an elliptical cross section with gradually varying cross-sectional dimensions, etc. It should be noted that the racetrack shape described herein refers to a shape in which the two short sides of a rectangle are replaced with convex curves.

[0195] Therefore, the depth H3 of the second accommodating groove 12120 refers to the maximum depth of the second accommodating groove 12120 along the axial direction R of the electrode post 12. In the axial direction R of the electrode post 12, the depth H3 of the second accommodating groove 12120 is equal to or greater than the minimum distance H4 from the electrode post outer end surface 123 to the communicating hole 113. This allows the volume of the electrode post 12 to be fully utilized, resulting in a deeper second accommodating groove 12120, which is advantageous for accommodating more conductive parts 22 and significantly reducing the space occupied by the conductive parts 22 within the casing 11, thereby further improving the energy density of the battery cell 10 and reducing the redundancy of the conductive parts 22 within the casing 11. At the same time, the second accommodating groove 12120 has a relatively deep depth, which can accommodate gas generated by the electrode assembly 2 and improve the reliability and stability of the battery cell 10. This can also extend the service life of the battery cell 10 and accommodate more electrolyte.

[0196] 21 and 22, which is a schematic cross-sectional view of a battery cell 10 according to some embodiments of the present application. In the embodiments of the present application, when the receiving portion 121 has the second receiving groove 12120 of any one of the above embodiments, the battery cell 10 may optionally further include a cover plate 13 that is fitted with the electrode post 12, seals the opening of the second receiving groove 12120, and is electrically connected to the electrode post 12.

[0197] In the above technical solution, by installing the cover plate 13 to seal the groove opening of the second accommodating groove 12120, it is possible to reduce the leakage of the electrolyte in the casing 11 from the groove opening of the second accommodating groove 12120, and by sealing the groove opening of the second accommodating groove 12120 and electrically connecting the cover plate 13 to the pole 12, it is possible to easily realize an indirect electrical connection between the pole 12 and the bus member using the cover plate 13, and it is advantageous to increase the connection area of ​​the electrical connection point and further reduce the resistance of the electrical connection point.

[0198] It should be noted that as long as the cover plate 13 can seal the opening of the second accommodating groove 12120, the method and position of fitting the cover plate 13 to the electrode post 12 are not limited. For example, in some embodiments, the cover plate 13 may be welded to the electrode post 12, and during processing, the conductive portion 22 may first be passed through the through hole 12130 and welded to the wall of the second accommodating groove 12120, and then the cover plate 13 and the electrode post 12 may be welded to seal the opening of the second accommodating groove 12120.

[0199] It should be further explained that the specific configuration of the cover plate 13 is not limited. For example, in some alternative 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 being fitted to and electrically connected with the pole 12, and the second conductive member 132 being fitted to and electrically connected with the first conductive member 131.

[0200] In the above technical solution, the cover plate 13 is installed in a composite form, and the first conductive member 131 is installed so that it is made of the same material as the electrode post 12, thereby facilitating electrical connection between the first conductive member 131 and the electrode post 12. For example, the first conductive member 131 and the electrode post 12 can be easily, reliably, and stably connected by welding. Furthermore, because the second conductive member 132 and the first conductive member 131 are made of a different material, the second conductive member 132 can be used to easily electrically connect to bus members made of a different material from the electrode post 12. For example, the second conductive member 132 can be easily, reliably, and stably connected to bus members made of the same material as the second conductive member 132 by welding.

[0201] For example, if the electrode post 12 is a negative electrode post 12, the electrode post 12 is a copper post, and the bus member is an aluminum sheet, the first conductive member 131 can be mounted on the copper material and the second conductive member 132 can be mounted on the aluminum material. In this case, the electrode post 12 and the first conductive member 131 can be made of the same material and effectively welded together, and the second conductive member 132 and the bus member can be made of the same material and effectively welded together, thereby effectively realizing an indirect electrical connection between the electrode post 12 and the bus member via the cover plate 13. The electrode post 12 and the first conductive member 131 are welded together, which is advantageous in that it has excellent fluidity, is less likely to crack, and improves the sealing effect of the welded area.

[0202] 22 again, in some optional examples, the first conductive member 131 is located between the second accommodating groove 12120 and the second conductive member 132. In the above technical solution, the first conductive member 131 is located between the second accommodating groove 12120 and the second conductive member 132, so that the second accommodating groove 12120 and the second conductive member 132 are separated from each other. As a result, when the electrolyte in the casing 11 enters the second accommodating groove 12120 through the through hole 12130, the first conductive member 131 is used to reduce the contact of the electrolyte in that portion with the second conductive member 132, and the problem of corrosion of the second conductive member 132 by the electrolyte is solved.

[0203] It should be noted that the method of fitting 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, the second conductive member 132 is fitted into the second groove 1311, and the opening of the second groove 1311 is formed on the surface of the first conductive member 131 opposite the second receiving groove 12120, such that the second conductive member 132 is exposed from the opening of the second groove 1311. Alternatively, in other embodiments, the method of connecting the first conductive member 131 and the second conductive member 132 may be a fastening connection, an engagement, or the like.

[0204] For further explanation, the second conductive member 132 being "exposed" from the groove opening of the second groove 1311 means that the first conductive member 131 does not block the second conductive member 132 at the groove opening position of the second groove 1311, and the second conductive member 132 does not need to protrude from the groove opening of the second groove 1311; for example, the second conductive member 132 may be positioned flush with the surface of the first conductive member 131 opposite the second accommodating groove 12120, or the second conductive member 132 may protrude from the surface of the first conductive member 131 opposite the second accommodating groove 12120.

[0205] In the above technical solution, on the one hand, by fitting the second conductive member 132 into the first conductive member 131, the difficulty of assembling the first conductive member 131 and the second conductive member 132 can be reduced, and the fitting stability and convenience of the first conductive member 131 and the second conductive member 132 can be improved. Furthermore, the thickness of the cover plate 13 can be reduced, reducing the space occupied by the cover plate 13 and improving the space utilization rate of the battery cell 10. On the other hand, the second conductive member 132 can be exposed from the surface of the first conductive member 131 opposite the second receiving groove 12120 through the opening of the second groove 1311, which is advantageous for achieving electrical connection between the second conductive member 132 and bus members outside the pole 12.

[0206] Furthermore, since the groove mouth of the second groove 1311 is formed on the surface opposite to the second accommodating groove 12120 of the first conductive member 131, the second groove 1311 opens in the opposite direction to the active material application portion 21, and a portion of the groove wall of the second groove 1311 of the first conductive member 131 is located between the second accommodating groove 12120 and the second conductive member 132, thereby separating the second accommodating groove 12120 and the second conductive member 132 and preventing contact between the electrolyte entering the second groove 1311 and the second conductive member 132, thereby reducing leakage of the electrolyte.

[0207] Of course, in other embodiments, the cover plate 13 may not be a composite made of multiple materials. For example, in other embodiments of the present application, the cover plate 13 may be provided in a non-composite form made entirely of the same material, for example, to fit the positive electrode pole 12, but this description will not be given here.

[0208] 22 again, the cover plate 13 is further fitted into the opening of the second accommodating groove 12120. In the above technical solution, fitting the cover plate 13 into the second accommodating groove 12120 reduces the difficulty of assembling the cover plate 13 and the pole 12, improves the assembly stability and connection reliability and convenience between the cover plate 13 and the pole 12, and reduces the space occupied by the cover plate 13 other than the pole 12. Furthermore, because the cover plate 13 is fitted into the opening of the second accommodating groove 12120, there is a relatively sufficient space within the second accommodating groove 12120 for accommodating the conductive part 22.

[0209] Of course, in other embodiments of the present application, the method of fitting the cover plate 13 and the pole 12 is not limited to being fitted into the second accommodating groove 12120, and the cover plate 13 may also be directly fitted over the outside of the pole 12, that is, as long as it can be easily fitted into the bus member of the battery 100, it may be directly fitted over the groove opening of the second accommodating groove 12120, and is not limited in this embodiment.

[0210] According to some embodiments of the present application, the present application further provides a battery 100 including the battery cell 10 according to the above technical solution.

[0211] In the technical solution of the embodiment of the present application, the electrode pole 12 is installed on the mounting wall 114 of the casing body 111, and the electrode pole 12 is used to increase the structural strength of the mounting wall 114, making the mounting wall 114 less likely to deform, thereby improving the protective effect of the casing body 111 on the electrode assembly 2 and making it easier to control the consistency of the explosion pressure of the explosion-proof valve 6.

[0212] According to some embodiments of the present application, the present application further provides an electric device including the battery 100 according to the above technical solution, where the battery 100 is used to provide electric energy to the electric device. The electric device may be any one of the above-mentioned equipment or systems using a battery.

[0213] According to some embodiments of the present application, a casing body assembly 101 is provided, which includes a casing body 111, an explosion-proof valve 6, and a pole 12. The casing body 111 has an opening 1110 and includes a mounting wall 114 located on a wall opposite the opening 1110 of the casing body 111. A mounting hole 115 and a communication hole 113 are formed through the mounting wall 114. The explosion-proof valve 6 is provided in the mounting hole 115 and connected to the mounting wall 114. The pole 12 is provided in the communication hole 113 and connected to the mounting wall 114.

[0214] The outer peripheral wall of the electrode post 12 has an annular groove 128 extending along its circumferential direction. The annular groove 128 fits into the edge of the communicating hole 113, fixing the electrode post 12 to the communicating hole 113 and preventing the electrode post 12 from easily falling off the mounting wall 114. The engagement of the annular groove 128 with the edge of the communicating hole 113 also restricts the movement of the electrode post 12, easily reducing the possibility of collision between the electrode post 12 and the edge of the communicating hole 113. This allows the electrode post 12 to be electrically connected to the battery cell 10 more stably, and the electrode post 12 to output the electrical energy inside the battery cell 10 to an external circuit more stably. Among these, by stably fixing the pole 12 to the communication hole 113 of the mounting wall 114, even if the pressure inside the battery cell 10 is large or one side of the pole 12 is subjected to pressure, the pole 12 is unlikely to fall off the mounting wall 114, and the pole 12 can stably reinforce the structural strength of the mounting wall 114.

[0215] The depth of the mounting hole 115 extends in the vertical direction, and the mounting hole 115 includes, from top to bottom, a fourth hole step 1154, a third hole step 1153, a first hole step 1151, and a second hole step 1152. The hole diameters of the fourth hole step 1154, the third hole step 1153, the first hole step 1151, and the second hole step 1152 decrease in order, and the third step surface 1163, the second step surface 1162, and the first step surface 1161 are defined in order. The explosion-proof valve 6 is supported by the first step surface 1161, and the explosion-proof valve 6 is located on the first hole step 1151. The protective sheet 14 is supported by the second step surface 1162, and the protective sheet 14 is located on the fourth hole step 1154.

[0216] The second hole section 1152 separates the space between the first hole section 1151 and the inside of the casing body 111. After the explosion-proof valve 6 is installed on the first step surface 1161, the explosion-proof valve 6 and the internal components of the casing body 111 are separated by at least the first hole section 1151. In this way, when the air pressure inside the battery cell 10 increases, gas can be collected in the first hole section 1151, and the gas can directly apply pressure from the first hole section 1151 to the explosion-proof valve 6. When the air pressure inside the battery cell 10 exceeds a threshold, the air pressure can destroy the explosion-proof valve 6, thereby realizing the pressure release of the battery cell 10.

[0217] The third hole section 1153 is used to reserve space for the weld seam that will be formed when the explosion-proof valve 6 is welded to the second hole edge. When the explosion-proof valve 6 is welded to the mounting wall 114, the weld seam that will be formed will protrude from the explosion-proof valve 6. The third hole section 1153 can reserve space for the weld seam in advance. In this way, when installing components on the mounting wall 114, the components and the weld seam can be protected, and the possibility of the components rubbing against the weld seam can be reduced. The weld seam can stably connect the explosion-proof valve 6 to the mounting wall 114, so that the explosion-proof valve 6 is stably fixed to the mounting wall 114.

[0218] The communication holes 113 and the mounting holes 115 are spaced apart along the length of the mounting wall 114, and the poles 12 and the explosion-proof valve 6 are spaced apart along the length of the mounting wall 114. The mounting wall 114 has two communication holes 113 and one mounting hole 115, and the mounting hole 115 is located between the two communication holes 113. The two poles 12 are located in one-to-one correspondence within the communication holes 113. That is, the two poles 12 are located on both sides of the explosion-proof valve 6, and the two poles 12 may both be positive poles 1201 or negative poles 1202, or one may be a positive pole 1201 and one may be a negative pole 1202.

[0219] Since these two pole posts 12 are located on both sides of the mounting hole 115, the structural strength of the area of ​​the mounting wall 114 near the mounting hole 115 is reinforced from both sides of the mounting hole 115, and furthermore, the effect of the mounting hole 115 on the structural strength of the mounting wall 114 is sufficiently reduced, making it easy to reinforce the structural strength of the mounting wall 114.

[0220] The distance between the portions where the edge of communicating hole 113 and the edge of mounting hole 115 are close to each other is set to 1 mm to 30 mm, and within this range, mounting hole 115 and communicating hole 113 are not electrically connected, and a solid area of ​​at least 1 mm is provided between mounting hole 115 and communicating hole 113 to reserve a press-fit area in advance for press processing, and further, communicating hole 113 and mounting hole 115 can be easily formed in mounting wall 114 by processing.

[0221] The distance between the edge of the communicating hole 113 and the edge of the mounting hole 115 where they are closest to each other is set to 1mm to 30mm, and the mounting hole 115 and the communicating hole 113 are not far apart. By reducing the distance between the mounting hole 115 and the communicating hole 113, after the electrode post 12 is installed in the communicating hole 113, the electrode post 12 can reinforce the structural strength of the area of ​​the mounting wall 114 near the communicating hole 113. Since the communicating hole 113 and the mounting hole 115 are not far apart, after the electrode post 12 is installed in the mounting wall 114, the structural strength of the entire mounting wall 114 is sufficiently reinforced, and the electrode post 12 can reduce the impact of the mounting hole 115 on the structural strength of the mounting wall 114.

[0222] Finally, it should be noted that the above embodiments are used only to explain the technical solutions of the present application and are not intended to limit the same. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some or all of the technical features with equivalents. Such modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and should all be included in the scope of the claims and description of the present application. In particular, as long as there is no structural contradiction, the technical features mentioned in the embodiments can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions included within the scope of the claims. [Explanation of symbols]

[0223] 1000 vehicles, 100 battery, 200 controller, 300 motor, 10 Battery cell, 101 Casing body assembly, 11 casing, 111 casing body, 1110 opening, 112 casing cover, 113 communication hole, 114 mounting wall, 115 mounting hole, 1151 first hole section, 1152 second hole section, 1153 third hole section, 1154 fourth hole section, 1161 first step surface, 1162 second step surface, 1163 third step surface, 117 exhaust groove, 12 pole, 1201 positive pole, 1202 negative pole, 121 accommodation portion, 12110 first accommodation groove, 12111 first end wall, 12112 first sunken groove, 12113 first side wall, 12120 second accommodation groove, 12121 second end wall, 12122 second sunken groove, 12123 second side wall, 12130 through hole, 122 pole inner end surface, 123 pole outer end surface, 126 first recessed groove, 127 spacing portion, 128 annular groove, 13 cover plate, 131 first conductive member, 1311 second groove, 132 second conductive member, 14 protective sheet, 20 case, 201 first part, 202 second part, 2 electrode assembly, 21 active material application portion, 22 conductive portion, 3 support, 314 through hole, 4 insulating member, 6 explosion-proof valve, 61 thickness reduction section, 7 groove cover.

Claims

1. A battery cell casing body assembly, comprising: a casing body including a mounting wall having an opening and a mounting hole extending therethrough; an explosion-proof valve provided in the mounting hole and connected to the mounting wall; a pole provided on the mounting wall and spaced apart from the mounting hole, Battery cell casing body assembly.

2. A communication hole is formed through the mounting wall, and the pole is disposed in the communication hole and connected to the mounting wall. The battery cell casing body assembly according to claim 1 .

3. an outer peripheral wall of the pole post having an annular groove extending along the circumferential direction thereof, the annular groove fitting with a hole edge of the communication hole; The battery cell casing body assembly according to claim 2 .

4. the minimum distance between the edge of the communication hole and the edge of the mounting hole is 1 mm to 30 mm; The battery cell casing body assembly according to claim 2 or 3.

5. the mounting hole includes a first hole section and a second hole section that are aligned in a thickness direction of the mounting wall and communicate with each other, the second hole section being closer to the internal cavity of the casing body than the first hole section; a first step surface is formed between the first hole section and the second hole section, and the explosion-proof valve is provided in the first hole section and fitted to the first step surface; A casing body assembly for a battery cell according to any one of claims 1 to 4.

6. The mounting hole further includes a third hole step communicating with an end of the first hole step opposite to the second hole step, a second step surface is formed between the first hole step and the third hole step, the explosion-proof valve is welded to the mounting wall to form a welded seam, and the third hole step is used to accommodate the welded seam. The battery cell casing body assembly according to claim 5 .

7. The explosion-proof valve further includes a protective sheet provided on the opposite side of the second hole section to cover the explosion-proof valve. The battery cell casing body assembly according to claim 6 .

8. The mounting hole further includes a fourth hole step communicating with an end of the third hole step opposite to the first hole step, a third step surface is formed between the fourth hole step and the third hole step, and the protective sheet is provided on the fourth hole step and engages with the third step surface. The battery cell casing body assembly according to claim 7 .

9. an exhaust groove communicating with the mounting hole is provided on the mounting wall opposite the internal cavity of the casing body, and the protective sheet covers a portion of the exhaust groove; The battery cell casing body assembly according to claim 7 .

10. The cross-sectional shape of the exhaust groove is rectangular, trapezoidal, or triangular. The battery cell casing body assembly according to claim 9.

11. The explosion-proof valve is an integrally molded product, and has a thickness reduction portion, or the explosion-proof valve has a split structure. A battery cell casing body assembly according to any one of claims 1 to 10.

12. one pole is provided on the mounting wall, and the pole and the explosion-proof valve are spaced apart in the longitudinal direction of the mounting wall; A casing body assembly for a battery cell according to any one of claims 1 to 11.

13. At least two poles are provided on the mounting wall, and the at least two poles are spaced apart in the longitudinal direction of the mounting wall, and the explosion-proof valve is located between the two poles. A casing body assembly for a battery cell according to any one of claims 1 to 11.

14. The mounting wall is located on a wall of the casing body facing the opening. A casing body assembly for a battery cell according to any one of claims 1 to 13.

15. A battery cell, a casing body assembly, which is the battery cell casing body assembly according to any one of claims 1 to 14; an electrode assembly provided in the casing body, the electrode assembly including an active material application portion and a conductive portion connected to the active material application portion and electrically connected to the electrode post; a casing cover covering the opening to seal the electrode assembly within the casing body. Battery cell.

16. the mounting wall is located on a wall of the casing body facing the opening, the pole has a housing portion, and at least a portion of the conductive portion extends into the housing portion; The battery cell of claim 15.

17. the accommodating portion includes a first accommodating groove, the surface of the electrode post facing the active material-coated portion is an electrode post inner end face, the groove opening of the first accommodating groove is formed in the electrode post inner end face, and at least a portion of the conductive portion is accommodated in the first accommodating groove; The battery cell of claim 16.

18. the accommodating portion includes a second accommodating groove, the surface of the pole opposite to the active material coated portion being the pole outer end face, the groove opening of the second accommodating groove being formed in the pole outer end face, the second accommodating groove communicating with the internal cavity of the casing body via a through hole, the conductive portion being inserted into the through hole and at least a portion of the conductive portion being accommodated in the second accommodating groove; The battery cell of claim 16.

19. A battery cell according to any one of claims 15 to 18, battery.

20. 20. The battery of claim 19, Electrical equipment.

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