Battery cells, batteries and electrical devices

Abstract

This application discloses a battery cell, a battery, and an electric device. The battery cell includes a casing including a casing cover and a casing body, a battery core assembly including an active material application portion, and a support located at one end of the active material application portion away from the opening of the casing body and fitted to the battery core assembly. The support has a main body and an extension portion provided on the peripheral edge of the main body, such that the projection of the main body onto the plane of the casing cover is located within the projection of the active material application portion onto the plane of the casing cover, and the projection of the extension portion onto the plane of the casing cover is outside the projection of the active material application portion onto the plane of the casing cover. The technical solution of the embodiment of this application reduces the probability of the active material application portion coming into contact with the casing, thereby reducing the occurrence of the casing damaging the active material application portion.

Description

[Technical Field]

[0001] This application relates to the field of batteries, and more particularly to battery cells, batteries, and electrical devices. [Background technology]

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, with 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, improving the reliability of battery cells is an urgent issue that needs to be addressed. Summary of the Invention

[0003] In view of the above problems, the present application provides a battery cell, a battery, and an electric device, in which a support for the battery cell can improve the reliability of use of the battery cell.

[0004] In a first aspect, the present application provides a battery cell comprising: a casing including a casing cover and a casing body having an opening, the casing cover covering the opening; a battery core assembly including an active material application portion provided within the casing; and a support installed at one end of the active material application portion remote from the opening and fitted to the battery core assembly, wherein the support has a main portion and an extension portion provided on the peripheral side of the main portion, and the projection of the main portion onto the plane of the casing cover is located within the projection of the active material application portion onto the plane of the casing cover, and the projection of the extension portion onto the plane of the casing cover is located outside the projection of the active material application portion onto the plane of the casing cover.

[0005] In the technical proposal of the embodiment of the present application, the support is installed at one end away from the opening of the active material application portion, and the projection of the main body part onto the plane of the casing cover is located within the projection of the active material application portion onto the plane of the casing cover, and then they are attached to the casing together. During the process of attaching the battery core assembly with the support into the casing, the support will come into preferential contact with the casing body, which to some extent prevents the end of the casing body close to the opening from coming into direct contact with the active material application portion, and minimizes the occurrence of the phenomenon of the casing damaging the active material application portion. By locating the projection of the extension part onto the plane of the casing cover outside the projection of the active material application portion onto the plane of the casing cover, the active material application portion can be protected during the process of attaching to the casing, reducing the probability of the active material application portion coming into contact with the casing, and further reducing the occurrence of the phenomenon of the casing damaging the active material application portion. In addition, the installation of the support reduces the occurrence of the phenomenon in which the casing damages the active material application area, thereby reducing the possibility of the active material falling off, and to some extent prevents internal short circuits caused by the fallen active material overlapping with pole pieces of opposite polarity, and also to some extent prevents chemical reactions between the fallen active material and the casing, which could lead to corrosion and penetration of the casing, thereby improving the reliability of the battery cell.

[0006] In some embodiments, the extension portions are located on opposite sides of the main body along a predetermined direction, the predetermined direction being parallel to the plane of the casing cover, and can prevent the opposite edges of the active material application portion from contacting the casing, thereby preventing the casing from damaging the opposite edges of the active material application portion.

[0007] In some embodiments, the extension portion has a ring-shaped structure surrounding the main body portion. The support protects the outer edge of one end of the active material-coated portion and prevents the outer edge of the active material-coated portion facing the support from contacting the casing, thereby preventing the casing from damaging the active material-coated portion and further improving the reliability of the battery cell.

[0008] In some embodiments, the edge of the surface of the extension facing the casing cover has a guide surface, which may include an arcuate surface and / or an inclined surface. The guide surface can serve as a guide, so that the support may be smoothly installed in the casing body, improving assembly efficiency.

[0009] In some embodiments, the support is engaged or glued to the battery core assembly, so that the support and the battery core assembly are connected to each other and can prevent the support from falling off before being attached to the casing to a certain extent, thereby improving the yield rate of the battery cells; and the support and the battery core assembly can be attached to the casing together, so that the battery core assembly can be protected and the battery core assembly can be smoothly and safely attached to the casing, as well as playing an insulating role.

[0010] In some embodiments, a position limiting protrusion is provided on the side of the extension portion closest to the casing cover, and the support is engaged with the active material-coated portion via the position limiting protrusion. This arrangement allows the position limiting protrusion to restrain one end of the active material-coated portion, reducing the likelihood of the outer layer of the active material-coated portion becoming loose, protecting the one end of the active material-coated portion, and alleviating the problem of the one end of the active material-coated portion coming into contact with the casing, thereby reducing the occurrence of damage to the active material-coated portion by the casing. The support is engaged with the active material-coated portion via the position limiting protrusion, which prevents, to some extent, the support from falling off before being attached to the casing, thereby improving the yield rate of battery cells.

[0011] In some embodiments, the surface of the position limiting protrusion facing the active material application portion includes a first surface that is bonded to the side wall of the active material application portion and / or a second surface whose distance from the active material application portion gradually increases along the direction of the support toward the opening. The first and second surfaces can restrain the battery core assembly, thereby reducing the probability that the outer layer of the battery core assembly will become loose, further protecting the side wall of the battery core assembly and reducing the problem of one end of the battery core assembly contacting the casing. The second surface can act as a guide, facilitating assembly and improving the assembly efficiency of the battery core assembly and the support.

[0012] In some embodiments, the battery cell further includes an insulating member that encloses the active material application portion and is connected to the extension portion. The insulating member is located between the active material application portion and the casing, serves as an insulator, protects the battery core assembly, prevents the battery core assembly and the battery cell casing from overlapping, and effectively reduces corrosion caused by exposure of the battery core assembly. Connecting the insulating member to the extension portion makes it easy to fix the insulating member.

[0013] In some embodiments, the insulating member is connected to the peripheral wall surface of the extension portion, which can improve the reliability of the connection between the insulating member and the peripheral wall of the support and reduce the risk of the insulating member falling off.

[0014] In some embodiments, the peripheral wall surface has a first step surface and a second step surface, the second step surface being located on the side of the first step surface closer to the casing cover and closer to the active material-coated portion than the first step surface, and the insulating member is connected to the second step surface. In the above technical solution, by configuring the peripheral wall surface to include the first step surface and the second step surface, an installation space can be provided for the insulating member, and by connecting the insulating member to the second step surface, the risk of the connection structure between the insulating member and the second step surface rubbing against the casing and falling off can be reduced, and the reliability of the connection between the insulating member and the support can be further improved.

[0015] In some embodiments, the first stepped surface is farther from the active material-coated portion than the outer surface of the insulating member. The first stepped surface not only protects the edges of the insulating member and the active material-coated portion and reduces the occurrence of the phenomenon in which the edges of the insulating member and the active material-coated portion rub against the inner wall of the casing, but also protects the connection position between the insulating member and the second stepped surface, reducing the risk of the connection structure between the insulating member and the second stepped surface rubbing against the casing and falling off, thereby further improving the reliability of the connection between the insulating member and the support.

[0016] In some embodiments, the battery cell further includes an insulating member that encases the active material-coated portion and is connected to a surface of the main body that faces away from the casing cover. During installation of the battery core assembly with the support in the casing, the casing does not rub against the edge of the insulating member, nor does it rub against the connection between the insulating member and the main body. Furthermore, the connection between the insulating member and the main body is not easily separated during installation. This reduces movement and slippage of the insulating member during installation of the battery core assembly in the casing, improves the reliability of the connection between the insulating member and the support, and reduces the risk of the insulating member falling off. This reduces the risk of casing corrosion, battery core assembly failure, and leakage due to exposure of the battery core assembly. Furthermore, the reliability and stability of the battery cell are improved. Furthermore, by connecting at least a portion of the insulating member to the wall of the main body that faces away from the battery core assembly, the insulating member can be designed to be longer and can be adapted to battery core assemblies of different sizes, resulting in higher compatibility and improved manufacturability. On the other hand, after the support and battery core assembly are installed in place in the casing, the insulating member is pressed between the wall surface facing the opening of the casing and the main body, which further reduces the risk of the insulating member falling off and the risk of the battery core assembly failing due to exposure, while also reducing the risk of corrosion of the casing and improving the reliability and stability of the battery cell.

[0017] In some embodiments, the casing is provided with poles. , electricThe battery core assembly further includes a conductive part, which is connected to the side of the active material-coated part adjacent to the main body, and the main body has a through-hole through which the conductive part is connected to the electrode post. In the above technical solution, on the one hand, by providing the through-hole in the main body, the support can play the role of converging and accommodating the conductive part, facilitating the connection between the conductive part and the electrode post and improving the reliability and convenience of assembling the battery cell. On the other hand, because the support converges the conductive part, the original plastic member structure of the battery cell can be omitted, and the fitting of the support and the insulating member can achieve insulation between the entire active material-coated part and the casing, effectively reducing manufacturing and production costs.

[0018] In some embodiments, the support has a one-piece structure, or the support has a separate structure and includes a first support and a second support molded separately, with a through-hole defined between the first support and the second support. A one-piece support is easy to process and has relatively good support reliability, facilitating assembly of the support and the casing assembly, improving assembly efficiency and fitting stability. When assembling the support and the battery core assembly, the through-hole is defined by fitting the first support and the second support together, eliminating the need to thread the conductive portion from one end to the other. Instead, the first support and the second support can be fitted together at the conductive portion to sandwich the conductive portion, and the through-hole surrounds the conductive portion, facilitating assembly of the support and the battery core assembly and improving assembly efficiency.

[0019] In some embodiments, a receiving groove communicating with the through hole is formed on the side of the main body away from the active material coated portion, and the receiving groove is used to receive at least a portion of the electrode post. In the above technical solution, on the one hand, receiving at least a portion of the electrode post in the receiving groove makes the overall structure of the battery cell more compact and reliable, which is advantageous for improving the energy density of the entire battery. On the other hand, providing the receiving groove partially insulates the electrode post from the casing by a support, which further improves the stability and reliability of the battery cell.

[0020] In some embodiments, a positioning portion is provided on the side of the main body away from the active material-coated portion, and the positioning portion is provided circumferentially around the through hole and extends toward the electrode post. The positioning portion can restrain, converge, or support the conductive portion, facilitating connection between the conductive portion and the electrode post and improving the efficiency and quality of battery cell assembly.

[0021] In some embodiments, the electrode post is provided with a receiving portion, at least a portion of the conductive portion is received in the receiving portion, and at least a portion of the positioning portion extends into the receiving portion and is used to guide the conductive portion to be received in the receiving portion. In the above technical solution, on the one hand, the electrode post is provided with a hollow structure and the positioning portion is fitted into the hollow structure, thereby guiding the conductive portion to be connected to the electrode post, improving the reliability of the connection and ensuring the efficiency and quality of assembly. On the other hand, the conductive portion can be fitted into the receiving portion, improving the assembly efficiency of the conductive portion and saving the space occupied by the conductive portion. By fully utilizing the space of the battery cell, the fit between the support and the electrode post and between the support and the conductive portion is both tighter and more reliable, making the structure of the battery cell more compact and more favorable to improving the energy density of the battery cell.

[0022] In some embodiments, a guide groove communicating with the through hole is formed on the side of the main body facing the active material-coated portion, and the guide groove accommodates at least a portion of the conductive portion, and the cross-sectional area of ​​the guide groove gradually increases along the direction approaching the active material-coated portion of the main body. The guide groove not only accommodates the conductive portion, but also allows the conductive portion to retreat and avoid being crushed, reducing the probability of the conductive portion becoming loose or folded over, and reducing redundancy.

[0023] In some embodiments, the support has at least one first guide groove for injecting electrolyte, the first guide groove for injecting electrolyte is located on the side of the support facing the active material application portion, and the at least one first guide groove for injecting electrolyte is connected to the guide groove. Tega Since the electrolyte can flow toward the guide groove, it can flow to the specified position, increasing the contact area between the electrolyte and the active material application portion.By installing the first liquid injection guide groove, the contact area between the electrolyte and the active material application portion is increased, making it possible to alleviate the problem of poor penetration into the active material application portion.

[0024] In some embodiments, the support has a first guide groove located on a side of the support facing the active material-coated portion, and / or a second guide groove located on a side of the support facing away from the active material-coated portion. During the injection, the electrolyte flows along the first guide groove and / or the second guide groove, providing a permeation path for the electrolyte and increasing the fluidity of the electrolyte, thereby improving the injection speed and shortening the anodization standing time.

[0025] In some embodiments, the support has a recess on the side facing the battery core assembly to avoid the outer edge of the battery core assembly on the side facing the support. By providing the recess, the rounded corner structure between the position limiting protrusion and the main body can be eliminated, and the rounded corner structure can be prevented from crushing the outer edge of the battery core assembly.

[0026] In some embodiments, the battery core assembly further includes a conductive portion connected to the side of the active material coated portion adjacent to the main body portion, and the casing is provided with a pole, the pole is provided with a housing, and at least a portion of the conductive portion is housed in the housing and connected to the pole. By housing at least a portion of the conductive portion in the housing, the space occupied by the battery cell itself can be reduced, allowing more battery cells to be housed in a battery of the same volume and improving the volumetric energy density of the battery. Furthermore, by housing at least a portion of the conductive portion in the housing to occupy the space within the pole, the redundancy of the conductive portion in the casing can be reduced at least to some extent, reducing the probability of a short circuit between the conductive portion and the active material coated portion, reducing the probability of a short circuit in the battery cell, and improving the reliability and stability of the operation of the battery cell and the battery.

[0027] In some embodiments, the receiving portion has a first receiving groove, the surface of the pole facing the active material coated portion is the pole inner end face, the opening of the first receiving groove is formed in the pole inner end face, and at least a portion of the conductive portion is received in the first receiving groove. In the above technical solution, on the one hand, by forming the first receiving 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, because the opening of the first receiving groove is formed in the pole inner end face, and the pole inner end face is the surface of the pole close to the active material coated portion, the first receiving groove can be opened toward the active material coated portion, and the conductive portion can easily extend into the first receiving groove, improving assembly efficiency. Furthermore, a first receiving groove of this type is easy to process, improving manufacturing efficiency.

[0028] In some embodiments, the accommodating portion has a second accommodating groove, the surface of the pole facing away from the active material application portion is the pole outer end face, the groove opening of the second accommodating groove is formed on the pole outer end face, the second accommodating groove communicates with the inside of the casing via a through hole, and the conductive portion is drilled in the through hole and is at least partially accommodated in the second accommodating groove. 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 away from the active material coated portion of the pole, so that the second accommodating groove can be opened in a direction away from the active material coated portion. In this way, when at least a portion of the conductive portion 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 portion, and the groove opening of the second accommodating groove can be used to easily electrically connect the conductive portion to the pole, further reducing the difficulty of manufacturing the battery cell and improving the manufacturing efficiency of the battery cell.

[0029] In some embodiments, there are two openings, each of which is provided with a casing cover, and the support is located at an end of the active material-coated portion remote from any of the openings. In the above technical solution, the casing body is provided with two openings, and the battery core assembly is provided with a support at an end of the battery core assembly remote from any of the openings. The battery core assembly including the two supports and the insulating member can be installed into the casing body through any of the openings, and an appropriate installation direction can be selected according to needs. After the battery core assembly is installed in place in the casing body, one part of the insulating member may be pressed between the wall of the casing body facing one of the openings and the corresponding support, and the other part of the insulating member may be pressed between the wall of the casing body facing the other opening and the corresponding support, further reducing the risk of the insulating member falling off and the risk of the battery core assembly being damaged due to exposure, while also reducing the risk of casing corrosion and improving the reliability and stability of the battery cell.

[0030] In some embodiments, at least one pole is installed on the casing wall adjacent to the support. The battery core assembly including the support and insulating member enters the casing body through the opening, and the conductive part directly faces the pole, so that the conductive part can be connected to the pole relatively easily, improving the assembly efficiency of the battery cell.

[0031] In a second aspect, the present application provides a battery comprising the battery cell of the above embodiment.

[0032] In the above technical solution, since the battery cell is installed in the battery, the support can restrain the active material application portion, and in addition, the extension portion protects the active material application portion, reduces the probability of the active material application portion coming into contact with the casing, and minimizes the occurrence of the phenomenon in which the casing damages the active material application portion, thereby improving the reliability of battery use, and the installation steps are simple, which is advantageous for improving production efficiency.

[0033] In a third aspect, the present application provides an electrical device including the battery of the above embodiment, wherein the battery is installed in the electrical device in the above technical solution, thereby improving the reliability and stability of the battery's operation, and thereby improving the reliability and stability of the battery device's operation.

[0034] The above description is merely a summary of the technical solution of the present application. In order to more clearly understand the technical means of the present application and to implement the present application in accordance with the contents of the specification, and to more clearly and easily understand the above and other objects, features and advantages of the present application, specific embodiments of the present application are specifically listed below. [Brief explanation of the drawings]

[0035] In order to more clearly explain the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings used in the embodiments. However, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope. Those skilled in the art can obtain other related drawings based on these drawings without any creative work. [Figure 1] 1 is a structural schematic diagram of a vehicle provided in accordance with some embodiments of the present application. [Figure 2] 1 is an exploded view of a battery structure provided in accordance with some embodiments of the present application. [Figure 3] 1 is a battery provided in accordance with some embodiments of the present application. [Figure 4] FIG. 2 is an exploded structural view of a battery cell according to some embodiments of the present application. [Figure 5] 1 is a structural cross-sectional view of a battery cell according to some embodiments of the present application. [Figure 6] FIG. 6 is an enlarged view of a portion A of the battery cell shown in FIG. 5. [Figure 7] FIG. 1 is a front view of a battery cell according to some embodiments of the present application. [Figure 8] FIG. 10 is a front view of a battery cell according to some other embodiments of the present application. [Figure 9] 1 is a cross-sectional view of a local structure of a battery cell according to some embodiments of the present application; [Figure 10] 10A and 10B are cross-sectional views of local structures of battery cells according to some other embodiments of the present application. [Figure 11] 10A and 10B are cross-sectional views of local structures of battery cells according to further some embodiments of the present application. [Figure 12] 10A and 10B are cross-sectional views of local structures of battery cells according to further some embodiments of the present application. [Figure 13] 1 is a structural cross-sectional view of a battery cell according to some embodiments of the present application after assembling a battery core assembly, a support, and an insulating member. [Figure 14] 14 is an enlarged view of a portion B of the battery cell shown in FIG. 13. [Figure 15]10 is a structural cross-sectional view of a battery cell according to some other embodiments of the present application after assembling a battery core assembly, a support, and an insulating member. [Figure 16] 1 is a structural schematic diagram of a support for a battery cell according to some embodiments of the present application; [Figure 17] 10A and 10B are structural schematic diagrams of supports for battery cells according to some other 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 structural cross-sectional view of a support for a battery cell according to some embodiments of the present application. [Figure 20] FIG. 1 is a top view of a support for a battery cell according to some embodiments of the present application. [Figure 21] 10A and 10B are top views of support for battery cells according to some other 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. [Figure 23] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 24] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 25] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 26] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 27] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 28] FIG. 28 is an exploded view of the structure of the battery cell shown in FIG. 27. [Figure 29] FIG. 29 is an exploded view of the first cover plate shown in FIG. 28. [Figure 30] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 31] FIG. 31 is an exploded view of the structure of the battery cell shown in FIG. 30. [Figure 32]FIG. 1 is an assembly diagram of a battery cell according to some embodiments of the present application. [Figure 33] 10A and 10B are assembly diagrams of battery cells according to some other embodiments of the present application. [Explanation of symbols]

[0036] Electric device 1000, battery 100, controller 200, motor 300, First direction Z, second direction X, third direction Y, axial direction R of the pole, Battery cell 10, case 20, first case 201, second case 202, Casing 11, casing body 111, opening 1110, mounting wall 1112, casing cover 112, first casing cover 1121, second casing cover 1122, mounting hole 113, pole post 12, accommodation portion 121, first accommodation groove 12110, first end wall 12111, first sunken groove 12112, first side wall 12113, second accommodation groove 12120, second end wall 12121, second sunken groove 12122, second side wall 12123, first groove step 12124, second groove step 12125, guide slope 12126, third step surface 12127, through hole 12130, pole post inner end surface 122, pole post outer end surface 123, first recessed groove 126, spacing portion 127, a first cover plate 13, a first conductive member 131, a second recessed groove 1311, a second conductive member 132, a stress relief groove 133, a second cover plate 14, Battery core assembly 2, first end 201, second end 202, active material coated portion 21, conductive portion 22, Support 3, through hole 311, guide groove 312, positioning portion 32, first support 33, second support 34, guide surface 35, main body portion 36, extension portion 37, peripheral wall surface 370, first step surface 371, second step surface 372, position limiting protrusion 38, first surface 381, second surface 382, ​​relief portion 391, first liquid injection guide groove 392, accommodation groove 393, Insulating member 4, connection mark 401, Groove cover 7. DETAILED DESCRIPTION OF THE INVENTION

[0037] 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 for the purpose of more clearly illustrating the technical solution of the present application, and are therefore merely examples, and do not limit the scope of the claims of the present application.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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 character " / " in this specification generally indicates that the related objects before and after it are in an "or" relationship.

[0042] In the embodiments of the present application, the same drawing symbols represent the same components, and for the sake of brevity, detailed descriptions of the same components will be omitted in different embodiments. It should be understood that the dimensions such as thickness, length, width, etc. of various components in the embodiments of the present application shown in the accompanying drawings, and the overall thickness, length, width, etc. of the integrated device, are merely exemplary and should not be construed as limitations of the present application.

[0043] The term "plurality" as used herein refers to two or more (including two).

[0044] 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.

[0045] In this application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc., but the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, rectangular, or have other shapes, etc., but the embodiments of this application are not limited thereto. Battery cells are generally classified into three types depending on the encapsulation method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, but the embodiments of this application are not limited thereto.

[0046] The battery referred to in the embodiments of this application refers to a single physical module containing one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may be a battery module or a battery pack. A battery module generally includes multiple battery cells. A battery pack generally includes a case and one or more battery cells installed in the case, or a battery pack includes a case and one or more battery modules installed in the case, and the case can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0047] For example, a battery cell may typically include a casing for housing an electrode assembly and an electrolyte, and the casing is provided with at least one positive electrode post and at least one negative electrode post. The electrode assembly is formed by stacking or winding a positive electrode piece, a negative electrode piece, and a separator film.

[0048] The positive electrode piece generally includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is applied directly or indirectly to the positive electrode current collector. The positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab sheet. Multiple positive electrode tab sheets are stacked together and electrically connected to a positive electrode pole. The negative electrode piece generally includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is applied directly or indirectly to the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, and the positive electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab sheet. Multiple negative electrode tab sheets are stacked together and electrically connected to a negative electrode pole. The material of the separator film is not particularly limited and may be, for example, polypropylene or polyethylene.

[0049] At the same time, battery cells primarily rely on the movement of metal ions between the positive and negative electrodes to function. Taking lithium-ion batteries as an example, the positive electrode current collector can be made of aluminum, the positive electrode active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc., the negative electrode current collector can be made of copper, and the negative electrode active material layer can be made of carbon or silicon. During charging and discharging, Li+ ions are repeatedly inserted and extracted between the two electrodes. During charging, Li+ ions are extracted from the positive electrode and inserted into the negative electrode through the electrolyte, leaving the negative electrode in a lithium-rich state, and vice versa during discharging.

[0050] 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.

[0051] In the manufacturing of battery cells in the related art, an active material layer is applied to a current collector and then cut to obtain pole pieces consisting of a current collector coated with an active material layer (referred to as an active material coated portion) and a current collector not coated with an active material layer (referred to as a tab sheet). Then, positive and negative electrode pieces and a separator film are sequentially stacked or wound to obtain an electrode assembly. In the electrode assembly, multiple tab sheets are stacked and installed to form a tab portion, which itself forms a conductive portion or is connected to an adapter sheet to form a conductive portion. The active material coated portion and the conductive portion form a battery core assembly. Electrode posts are installed on the casing cover of the battery cell. When assembling the battery cell, the conductive portion of the battery core assembly and the electrode posts on the casing cover are typically welded together and then attached to the casing through an opening in the casing body.

[0052] However, the inventors found that during the process of installing the battery core assembly into the casing through the opening, the insulating member and the battery core assembly (especially the edges of the battery core assembly) easily interfere with or rub against the casing, damaging the insulating member and the pole pieces of the battery core assembly, which can cause the active material to fall off and lead to an internal short circuit due to the active material and pole pieces of opposite polarity overlapping each other. Furthermore, during the process of rubbing against the casing, the insulating member is prone to wrinkles, which can cause the battery core assembly to come into contact with the inner wall surface of the casing, resulting in corrosion of the battery core assembly and affecting the reliability of use of the battery cell.

[0053] In order to reduce the occurrence of the phenomenon in which the casing damages the battery core assembly, the present application installs a support at one end away from the opening of the active material application portion, and installs the projection of the main body portion onto the plane of the casing cover within the projection of the active material application portion onto the plane of the casing cover, and then attaches them together to the casing. During the process of installing the battery core assembly with the support into the casing, the support will preferentially come into contact with the casing body, preventing to some extent the end portion of the casing body close to the opening from directly contacting the active material application portion, thereby minimizing the occurrence of the phenomenon in which the casing damages the active material application portion. By installing the projection of the extension portion onto the plane of the casing cover outside the projection of the active material application portion onto the plane of the casing cover, the active material application portion is protected during the process of installation into the casing, reducing the probability of the active material application portion coming into contact with the casing, and further reducing the occurrence of the phenomenon in which the casing damages the active material application portion. By installing the support, the occurrence of the phenomenon in which the casing damages the active material application portion is reduced, thereby reducing the possibility of the active material falling off, and to some extent preventing internal short circuits caused by the fallen active material overlapping with pole pieces of opposite polarity. It also to some extent prevents the occurrence of chemical reactions between the fallen active material and the casing, which would ultimately cause corrosion penetration of the casing, thereby improving the reliability of the battery cell in use.

[0054] The battery cells disclosed in the embodiments of the present application can be used in various energy storage systems that use batteries as a power source or as an energy storage element. Examples of such electric devices include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric scooters, electric vehicles, boats, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric toy cars, electric toy boats, and electric toy airplanes. Spacecraft can include airplanes, rockets, space shuttles, and spaceships.

[0055] Taking a vehicle as an example of an electric device according to an embodiment of the present invention, the structures of the battery cell, battery, and electric device provided by the embodiment of the present invention will be described in detail.

[0056] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of an electric device 1000, which is a vehicle provided by some embodiments of the present application. The vehicle may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range-extended vehicle, etc. A battery 100 is installed in the vehicle, and the battery 100 may be installed at the bottom, head, or tail of the vehicle. The battery 100 is used to supply power to the vehicle. For example, the battery 100 can function as an operating power source for the vehicle. The vehicle may further include a controller 200 and a motor 300. The controller 200 controls the battery 100 to supply power to the motor 300, for example, to meet the operating power needs during starting, navigation, and driving of the vehicle. In some embodiments of the present application, the battery 100 can be used not only as an operating power source for the vehicle but also as a driving power source for the vehicle, thereby providing driving power to the vehicle in place of or partially replacing fuel or natural gas.

[0057] Referring to FIG. 2, FIG. 2 is an exploded view of a structure of a battery 100 provided according to some embodiments of the present application. The battery 100 includes a case 20 and a plurality of battery cells 10 housed within the case 20. Here, the case 20 is used to provide a housing space for the battery cells 10, and the case 20 can adopt various structures. In some embodiments, the case 20 can include a first case 201 and a second case 202, which are covered with each other and jointly define a housing space for housing the battery cells 10. The second case 202 may be a hollow structure with one end open, and the first case 201 may be a plate-like structure, with the first case 201 covering the open side of the second case 202 so that the first case 201 and the second case 202 jointly define an assembly space, or both the first case 201 and the second case 202 may be hollow structures with one end open (for example, as shown in FIG. 2), with the open side of the first case 201 covering the open side of the second case 202. Of course, the case 20 formed by the first case 201 and the second case 202 may have various shapes, such as a cylindrical shape or a rectangular parallelepiped shape.

[0058] In the battery 100, the multiple battery cells 10 can be connected in series, parallel, or series-parallel, and a series-parallel connection refers to multiple battery cells 10 being connected in both series and parallel. The multiple battery cells 10 can also be connected in direct series, parallel, or series-parallel, and the entire battery cell set is housed in a case 20. Alternatively, the battery 100 may be a type in which multiple battery cells 10 are first connected in series, parallel, or series-parallel to form a battery module, and the multiple battery modules are further connected in series, parallel, or series-parallel to form an integrated battery module and housed in a case 20. The battery 100 may further include other structures, for example, the battery 100 may further include bus members for achieving electrical connection between the multiple battery cells 10.

[0059] 3, which is a schematic diagram of a battery cell 10 provided according to some embodiments of the present application. In the embodiment of the present application, the battery cell 10 is a rectangular parallelepiped, and the height direction of the battery cell 10 is a first direction Z, the length direction of the battery cell 10 is a second direction X, and the thickness direction of the battery cell 10 is a third direction Y. The first direction Z, the second direction X, and the third direction Y are perpendicular to each other two by two. Of course, in other embodiments of the present application, the battery cell 10 may be a cylindrical body, a flat body, or another shape, and is not limited to this embodiment.

[0060] 4 and 5, Fig. 4 is an exploded view of a battery cell according to some embodiments of the present application. Fig. 5 is a cross-sectional view of a battery cell according to some embodiments of the present application. In the embodiment of the present application, the battery cell 10 includes a casing 11, a battery core assembly 2, a support 3, and an insulating member 4.

[0061] The shape of the casing 11 can be adjusted according to the type of battery cell 10, and the type of battery cell 10 in the embodiments of the present application is not particularly limited. For example, if the battery cell 10 is a prismatic battery, the casing 11 will be prismatic, and if the battery cell 10 is a cylindrical battery, the casing 11 will be cylindrical. In the embodiments of the present application, the casing 11 will be prismatic. At the same time, the casing 11 is provided with electrode posts 12, which are electrically connected to the battery core assembly 2 to ensure normal charging and discharging of the battery cell 10. Generally, there are at least two electrode posts, specifically, at least one positive electrode post and at least one negative electrode post. For example, if there are two electrode posts, one is a positive electrode post and the other is a negative electrode post, which are electrically connected to the positive and negative output positions of the battery core assembly 2, respectively. Furthermore, when there are four poles, two may be positive poles and the remaining two may be negative poles, with the two positive poles both electrically connected to the positive output positions of the battery core assembly 2 and the two negative poles both electrically connected to the negative output positions of the battery core assembly 2. The casing 11 may further be provided with a pressure release mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold value, and the pressure release mechanism can release the pressure when the internal pressure or temperature of the battery cell 10 is too high to prevent the propagation of thermal runaway to other battery cells 10.

[0062] In the embodiment of the present application, the casing 11 specifically includes a casing body 111 and a casing cover 112 .

[0063] The casing body 111 has a semi-closed structure with an opening 1110 at one end, or a ring structure with openings 1110 at both ends. The casing body 111 may have various shapes and dimensions, such as a rectangular parallelepiped, a cylindrical shape, or a hexagonal prism, and the shape of the casing body 111 may be determined according to the specific shape and dimensions of the battery core assembly 2. The casing body 111 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic, and is not particularly limited in the embodiments of the present application. The casing body 111 has an opening 1110, and the opening 1110 may be one or more.

[0064] The casing cover 112 refers to a component that covers the openings 1110 of the casing body 111 to isolate the internal environment of the battery cell 10 from the external environment. The number of casing covers 112 corresponds to the number of openings 1110. When there is one opening 1110, the casing cover 112 is also one and covers and seals the opening 1110. When there are two openings 1110, the casing cover 112 is also two and covers and seals the two openings 1110, respectively. The casing cover 112 and the casing body 111 can form a common connection surface before other components are attached to the casing. When the interior of the casing body 111 needs to be sealed, the casing cover 112 covers the casing body 111. At the same time, the shape of the casing cover 112 can be adapted to the shape of the casing body 111 to fit into the casing body 111. Alternatively, the casing cover 112 may be made of a material (such as an aluminum alloy) having a certain hardness and strength, so that the casing cover 112 is less likely to deform when subjected to pressure or impact, and the battery cell 10 can have higher structural strength and improved safety performance. Functional components such as the poles 12 may be installed on the casing cover 112. 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.

[0065] The casing 11 is provided with electrode posts 12, and there may be a plurality of electrode posts 12. The plurality of electrode posts 12 may all be installed in the casing body 111, or all may be installed in the casing cover 112, or some may be installed in the casing body 111 and other parts may be installed in the casing bar 112. In the following embodiments of the present application, an example will be described in which the casing body 111 is rectangular, the casing body 111 has one opening 1110, and there are two electrode posts 12, one positive electrode post and one negative electrode post, and both of the two electrode posts 12 are installed on a wall facing the opening 1110 of the casing body 111. Of course, in other embodiments of the present application, the shape of the casing body 111, the number of openings 1110 and casing covers 112, the number of electrode posts 12, and the positions of the electrode posts 12 can all be adjusted according to needs and are not limited to the embodiments of the present application.

[0066] In the embodiment of the present application, the battery core assembly 2 includes an active material-coated portion 21 and a conductive portion 22. The active material-coated portion 21 is provided within the casing 11 and is a portion of the battery core assembly 2 to which an active material is applied, and can assist in the desorption of metal ions during the charging and discharging process of the battery cell 10. The conductive portion 22 is a metal structure that electrically connects the active material-coated portion 21 and the electrode post 12. The electrode post 12 may not be coated with an active material and may be electrically connected to the active material-coated portion 21 via the conductive portion 22 to enable charging and discharging of the battery cell 10. The conductive portion 22 may be formed by the tab sheet itself or after connecting the tab sheet to the adapter sheet.

[0067] The active material coated portion 21 is divided into a positive electrode active material coated portion and a negative electrode active material coated portion, the positive electrode active material coated portion includes a portion where a positive electrode active material layer is coated on a positive electrode current collector, and the negative electrode active material coated portion includes a portion where a negative electrode active material layer is coated on a negative electrode current collector. The conductive portion 22 is divided into a positive electrode conductive portion and a negative electrode conductive portion, the positive electrode conductive portion electrically connects the positive electrode active material coated portion and the positive electrode pole, and the negative electrode conductive portion electrically connects the negative electrode active material coated portion and the negative electrode pole.

[0068] 4 and 5 , in an embodiment of the present application, the support 3 is installed at one end of the active material application portion 21 remote from the opening 1110, and the support 3 is fitted to the battery core assembly 2. In an embodiment in which the casing body 111 has one opening 1110, in the process of installing the battery core assembly 2 with the support 3 in the casing 11, the support 3 first enters the casing body 111 through the opening 1110 of the casing body 111, and then the active material application portion 21 enters the casing body 111. After the battery core assembly 2 is installed in a predetermined position in the casing body 111, the support 3 is located on the wall of the casing body 111 facing the opening 1110 and on the one end of the active material application portion 21 remote from the opening 1110. In an embodiment in which the casing body 111 has two openings 1110, the two openings 1110 may be a first opening and a second opening respectively arranged opposite each other, and in the process of installing the battery core assembly 2 with the support 3 in the casing 11, the support 3 first enters the casing body 111 from the first opening and moves toward the second opening, then the active material application portion 21 enters the casing body 111, and after the battery core assembly 2 is installed in a predetermined position in the casing body 111, the support 3 is located at the second opening.

[0069] The insulating member 4 encases the active material application portion 21, and the insulating member 4 improves the insulation reliability between the active material application portion 21 and the casing 11, reduces or prevents the occurrence of corrosion of the casing 11 due to contact between the active material application portion 21 and the casing 11, reduces the problem of electrolyte leakage due to corrosion of the casing 11, and improves the reliability of the battery cell 10.

[0070] 4 and 5 again, the support 3 has a main body portion 36 and an extending portion 37, the extending portion 37 is provided on the peripheral side of the main body portion 36, the projection of the main body portion 36 onto the plane of the casing cover 112 is located within the projection of the active material applied portion 21 onto the plane of the casing cover 112, and the projection of the extending portion 37 onto the plane of the casing cover 112 is located outside the projection of the active material applied portion 21 onto the plane of the casing cover 112. In other words, along the direction perpendicular to the casing cover 112, the projection of the support 3 onto the plane of the casing cover 112 at least partially exceeds the projection of the active material applied portion 21 onto the plane of the casing cover 112.

[0071] Here, the support 3 may have a plate-like structure, and may be placed on the side of the active material application portion 21 where the conductive portion 22 is located, and the support 3 may be provided with an escape structure (for example, an escape groove or the through hole 311 described below) to avoid the conductive portion 22, or the support 3 may be placed on the side of the active material application portion 21 where the conductive portion 22 is not located, and in this way, there is no need to provide the support 3 with an escape structure to avoid the conductive portion 22.

[0072] When the support 3 is disposed on the side of the active material application section 21 where the conductive section 22 is located, the support 3 may be disposed facing the electrode post 12. That is, the support 3 and the electrode post 12 may be located on the same side of the active material application section 21, and the support 3 may be disposed between the electrode post 12 and the active material application section 21. When the support 3 is disposed on the side of the active material application section 21 where the conductive section 22 is not located, the support 3 is not disposed facing the electrode post 12. For example, the support 3 and the electrode post 12 may be located on adjacent sides of the active material application section 21, or for example, the support 3 and the electrode post 12 may be located on opposing sides of the active material application section 21.

[0073] It should be noted that in the embodiments of the present application, the support 3 in the embodiments of the present application can be added to the original structure of the battery cell in the prior art without changing the remaining structure of the battery cell in the prior art (e.g., the structures of the top cover, upper plastic member, lower plastic member, etc.), and an independent support 3 can also be adopted to replace the lower plastic member embedded under the top cover of the battery cell in the prior art.

[0074] In the technical solution of the embodiment of the present application, the support 3 is installed at one end of the active material application part 21 away from the opening 1110, and the projection of the main body part 36 onto the plane of the casing cover 112 is installed within the projection of the active material application part 21 onto the plane of the casing cover 112, and then they are attached to the casing. In the process of attaching the battery core assembly 2 with the support 3 to the casing 11, the support 3 comes into preferential contact with the casing body 111, and the end of the casing body 111 close to the opening 1110 contacts the active material application part 21. and minimize the possibility of the casing 11 damaging the active material-applied portion 21. By positioning the projection of the extension portion 37 onto the plane of the casing cover 112 outside the projection of the active material-applied portion 21 onto the plane of the casing cover 112, the active material-applied portion 21 is protected during the process of attaching to the casing, reducing the probability of the active material-applied portion 21 coming into contact with the casing 11 and further reducing the possibility of the casing 11 damaging the active material-applied portion 21. In addition, the provision of the support 3 reduces the possibility of the casing 11 damaging the active material-applied portion 21, thereby reducing the possibility of the active material falling off, preventing to some extent an internal short circuit caused by the falling off active material overlapping with a pole piece of opposite polarity, and preventing to some extent a chemical reaction between the fallen active material and the casing 11, which would result in corrosion and penetration of the casing 11, thereby improving the reliability of the battery cell 10.

[0075] In some embodiments, the extension portions 37 are located on opposite sides of the main body portion 36 along a predetermined direction, which is parallel to the plane of the casing cover 112. For example, referring to FIG. 4 , the cross-sectional shape of the battery cell 10 may be rectangular, the height direction of the battery cell 10 is a first direction Z, the length direction of the battery cell 10 is a second direction X, the casing cover 112 is installed at one end of the casing 11 in the height direction, and the extension portions 37 are located on opposite sides of the main body portion 36 along the second direction. Of course, the cross-sectional shape of the battery cell 10 is not limited to a rectangle and may be a circle or the like, and is not limited here.

[0076] In the above technical proposal, by installing the extension portions 37 on opposite sides of the main body portion 36 along a predetermined direction, it is possible to prevent the opposite edge portions of the active material application portion 21 from coming into contact with the casing 11, and to prevent the casing 11 from damaging the opposite edge portions of the active material application portion 21.

[0077] In some embodiments, the extension portion 37 has a ring-shaped structure that surrounds the main body portion 36. That is, the edges of the support 3 projected onto the plane of the casing cover 112 all extend beyond the projection of the active material-coated portion 21 onto the plane of the casing cover 112. By arranging the support 3 in this manner, the support 3 protects the outer edge of one end of the active material-coated portion 21 and prevents the outer edge of the active material-coated portion 21 facing the support 3 from contacting the casing 11. This prevents the casing 11 from damaging the active material-coated portion 21 and further improves the reliability of the battery cell 10.

[0078] Referring again to Figure 5 and further to Figure 6, Figure 6 is an enlarged view of location A of the battery cell 10 shown in Figure 5. The edge of the support 3 facing away from the casing cover 112 has a guide surface 35, that is, a peripheral portion of the surface of the support 3 facing away from the casing cover 112. Specifically, as shown in Figure 6, the edge of the support 3 facing away from the casing cover 112 includes at least the connection position between the side of the extension portion 37 facing away from the main body portion 36 and the side facing away from the casing cover 112.

[0079] Exemplarily, the guide surface 35 may include a sloped surface. Specifically, the edge of the support 3 facing away from the battery core assembly 2 may be chamfered. Here, "chamfering" refers to processing the corner of the support 3 into a certain sloped surface by a process such as cutting, to facilitate installation of the support 3 within the casing 11. Exemplarily, the guide surface 35 may include an arcuate surface. The arcuate surface may also serve as an automatic guide during installation of the support 3 within the casing 11. Exemplarily, the guide surface 35 may include an arcuate surface and a sloped surface. Naturally, the guide surface 35 may be a surface with another irregular shape, and is not limited thereto.

[0080] In the process of installing the battery core assembly 2 with the support 3 into the casing 11, the guide surface 35 can play a guiding role, so that the support 3 can be installed smoothly into the casing body 111, improving assembly efficiency.

[0081] According to some embodiments of the present application, the support 3 is engaged or glued to the battery core assembly 2 .

[0082] Specifically, in an embodiment in which the support 3 is engaged with the battery core assembly 2, the support 3 may be provided with an attachment groove, and the end of the active material-applied portion 21 remote from the opening 1110 may be fitted into the attachment groove, thereby realizing the purpose of engaging the end of the active material-applied portion 21 remote from the opening 1110 with the support 3, thereby simplifying the connection structure and making operation easy. Of course, the engagement method between the support 3 and the battery core assembly 2 is not limited to the above structure. In an embodiment in which the support 3 is bonded to the battery core assembly 2, a connecting adhesive may be applied between the end of the active material-applied portion 21 remote from the opening 1110 and the support 3, or a connecting adhesive may be applied between the side wall of the active material-applied portion 21 and the support 3, thereby realizing the purpose of bonding the end of the active material-applied portion 21 remote from the opening 1110 with the support 3. Of course, the position at which the connecting adhesive is applied is not limited to the above position.

[0083] It should be noted that the connection method between the support 3 and the battery core assembly 2 is not limited to the above structure, and can be specifically selected according to the actual situation. Since the support 3 is connected to the battery core assembly 2, it can to some extent prevent the support 3 from falling off before being attached to the casing, thereby improving the yield rate of the battery cells 10. Since the support 3 and the battery core assembly 2 are attached to the casing together, it can not only protect the battery core assembly 2 and ensure that the battery core assembly 2 is attached to the casing smoothly and safely, but also play an insulating role.

[0084] 7 and 8, Fig. 7 is a front view of a battery cell 10 according to some embodiments of the present application. Fig. 8 is a front view of a battery cell 10 according to some other embodiments of the present application. One side of the support 3 has a position limiting protrusion. 38 is provided, and a position limiting protrusion 38 is engaged with the active material coated portion 21.

[0085] For example, a position limiting protrusion 38 may be provided on the extension portion 37, and the position limiting protrusion 38 may be provided on the side of the extension 37 that is close to the casing cover 112, i.e., the position limiting protrusion 38 is formed so as to protrude from the surface of the extension portion 37 close to the casing cover 112 to the casing cover 112, and is a position limiting protrusion 38 may be provided on the side of the extension portion 37 that is separated from the main body portion 36, i.e., the position limiting protrusion 38 One end of the extension 37 is connected to the side of the extension 37 that is separated from the main body 36, and the position limiting protrusion 38 The other end of the second end 114 extends in a direction adjacent to the casing cover 112 and exceeds the end surface of the main body 36 adjacent to the casing cover 112 .

[0086] For example, a position limiting protrusion 38 may be provided on the main body 36, and the position limiting protrusion 38may be provided on the side of the main body 36 that is close to the casing cover 112, i.e., the position limiting protrusion 38 is formed so as to protrude from the surface of the main body 36 adjacent to the casing cover 112 toward the casing cover 112.

[0087] For ease of understanding, the active material application portion 21 may be defined as having a first end 201 and a second end 202 arranged opposite each other, and the position limiting protrusion 38 is located on the outside of the side wall adjacent to the first end 201 of the active material application portion 21. During the process of installing the battery core assembly 2 with the support 3 inside the casing 11, the first end 201 of the active material application portion 21 with the support 3 first enters the casing 11, and as the assembly process progresses, the first end 201 of the active material application portion 21 gradually moves away from the opening 1110 inside the casing 11. During the assembly process, the position limiting protrusion 38 is located between the side wall of the active material application portion 21 and the casing 11, and after the battery core assembly 2 and the support 3 are installed in a predetermined position inside the casing 11, the support 3 is located between the wall facing the opening 1110 of the casing 11 and the first end 201 of the active material application portion 21.

[0088] By being arranged in this manner, the position limiting protrusions 38 restrain one end of the active material-coated portion 21, reducing the likelihood that the outer layer of the active material-coated portion 21 will become loose, and further protecting the one end of the active material-coated portion 21 and alleviating the problem of the one end of the active material-coated portion 21 coming into contact with the casing 11, thereby reducing the occurrence of the phenomenon in which the casing 11 damages the active material-coated portion 21. At the same time, the support 3 is engaged with the active material-coated portion 21 via the position limiting protrusions 38, which to some extent prevents the support 3 from falling off before it is attached to the casing, thereby improving the yield rate of battery cells 10.

[0089] Referring again to FIG. 7, the position limiting protrusion 38 forms an annular protrusion, and the annular protrusion extends along the circumferential direction of the battery core assembly 2.

[0090] That is, the position limiting protrusion 38 may be an integral structure, and the position limiting protrusion 38 may be externally fitted to the outside of the battery core assembly 2. In this way, the position limiting protrusion 38 restrains the battery core assembly 2 in the circumferential direction of the battery core assembly 2, more effectively reducing the probability of the outer layer of the battery core assembly 2 becoming loose, and further protecting one end of the battery core assembly 2, reducing the problem of one end of the battery core assembly 2 contacting the casing 11, thereby reducing the occurrence of the phenomenon of the casing 11 damaging the battery core assembly 2.

[0091] Referring again to Figure 8, the position limiting protrusions 38 may be multiple, and the multiple position limiting protrusions 38 may be arranged at intervals around the circumferential direction of the battery core assembly 2, with a gap between two adjacent position limiting protrusions 38. By arranging them in this manner, the position limiting protrusions 38 can restrain and protect the battery core assembly 2, thereby not only reducing material and costs but also facilitating the assembly of the support 3 and the battery core assembly 2.

[0092] Of course, the arrangement of the plurality of position limiting protrusions 38 is not limited to the above and can be specifically selected according to actual needs. Here, the position limiting protrusions 38 are attached to the side walls of the battery core assembly 2, or there is a gap between the position limiting protrusions 38 and the side walls of the battery core assembly 2. That is, the position limiting protrusions 38 may or may not contact the side walls of the battery core assembly 2. The position limiting protrusions 38 stop the side walls of the battery core assembly 2, reduce the probability of the outer layer of the battery core assembly 2 becoming loose, protect the side walls of the battery core assembly 2, and reduce the problem of one end of the battery core assembly 2 contacting the casing 11.

[0093] 9, which is a cross-sectional view of a local structure of a battery cell 10 according to some embodiments of the present application. The surface of the position-limiting protrusion 38 facing the active material-coated portion 21 may include a first surface 381, which is bonded to the side wall of the active material-coated portion 21. The first surface 381 restrains the battery core assembly 2, reduces the likelihood that the outer layer of the active material-coated portion 21 will become loose, and protects the side wall of the active material-coated portion 21, thereby mitigating the problem of one end of the active material-coated portion 21 coming into contact with the casing 11.

[0094] 10, which is a cross-sectional view of a local structure of a battery cell 10 according to some other embodiments of the present application. The surface of the position-limiting protrusion 38 facing the active material applied portion 21 may include a second surface 382, ​​and the distance between the second surface 382 and the active material applied portion 21 gradually increases along the direction in which the support 3 faces the opening 1110. That is, the second surface 382 extends obliquely in a direction away from the base of the position-limiting protrusion 38 and the side wall of the active material applied portion 21. For example, the second surface 382 may be an inclined surface or an arcuate surface.

[0095] By being arranged in this manner, the second surface 382 can stop the sidewall of the active material coated portion 21, reducing the probability that the outer layer of the active material coated portion 21 will become fluffy and further protecting the sidewall of the active material coated portion 21. In addition, the second surface 382 can act as a guide, facilitating assembly and improving the assembly efficiency of the battery core assembly 2 and the support 3. 。

[0096] 11, which is a cross-sectional view of a local structure of a battery cell 10 according to further embodiments of the present application. The surface of the position-limiting protrusion 38 facing the active material applied portion 21 can include a first surface 381 and a second surface 382, ​​the first surface 381 is attached to the side wall of the active material applied portion 21, the distance between the second surface 382 and the active material applied portion 21 gradually increases along the direction in which the support 3 faces the opening 1110, and the first surface 381 is located between the base of the position-limiting protrusion 38 and the second surface 382.

[0097] Specifically, the contour line of the first surface 381 may be a straight line extending vertically along the height direction of the support 3, and the contour line of the second surface 382 may be a diagonal line inclined along the height direction of the support 3. By being arranged in this manner, it not only plays a good restraining role on the active material application portion 21 and effectively reduces the probability of the outer layer of the active material application portion 21 becoming fluffy, but also facilitates assembly and improves the assembly efficiency of the battery core assembly 2 and the support 3.

[0098] 12, which is a cross-sectional view of a local structure of a battery cell according to further some embodiments of the present application. The support 3 has a recess 391 on the side facing the battery core assembly 2 to relieve the outer edge of the battery core assembly 2 on the side facing the support 3, thereby reducing the risk that the support 3 will crush the battery core assembly 2.

[0099] Specifically, in an embodiment in which the support 3 has a position limiting protrusion 38, a rounded corner may appear at the base of the position limiting protrusion 38 on the side close to the center of the support 3 during molding. By providing the recess 391, the rounded corner between the position limiting protrusion 38 and the main body 36 can be eliminated, preventing the rounded corner from crushing the outer edge of the battery core assembly 2. Here, the recess 391 may be a groove opening toward the battery core assembly 2. For example, the groove may be an annular groove. For example, there may be multiple grooves, and the multiple grooves may be spaced apart. The shape of the groove may be selected according to the actual situation. For example, the recess 391 may be a sloped or arcuate relief surface that avoids contact with the battery core assembly 2. In other embodiments of the present application, the side of the support 3 facing the battery core assembly 2 can completely contact the battery core assembly 2, i.e., the side of the support 3 facing the battery core assembly 2 does not have a recessed structure.

[0100] 13 to 15, FIG. 13 is a structural cross-sectional view of a battery cell 10 according to some embodiments of the present application after assembling a battery core assembly 2, a support 3, and an insulating member 4. FIG. 14 is an enlarged view of a portion B of the battery cell 10 shown in FIG. 13. FIG. 15 is a structural cross-sectional view of a battery cell 10 according to some other embodiments of the present application after assembling a battery core assembly 2, a support 3, and an insulating member 4. The battery cell 10 may further include an insulating member 4, which encases the active material-coated portion 21 and is connected to the extension portion 37. Here, the insulating member 4 and the support 3 may be connected by adhesive or hot-melt, and of course, the insulating member 4 and the support 3 may be connected in other ways.

[0101] When the battery core assembly 2 with the support 3 is mounted in a predetermined position within the casing 11, the insulating member 4 is located between the active material application portion 21 and the casing 11, fulfilling an insulating role and protecting the battery core assembly 2, preventing the battery core assembly 2 from overlapping with the casing 11 of the battery cell 10, and effectively reducing the corrosion phenomenon caused by exposure of the battery core assembly 2. By connecting the insulating member 4 to the extension portion 37, the insulating member 4 can be easily fixed.

[0102] 13 and 14 again, the insulating member 4 is connected to a peripheral wall surface 370 of the extension portion 37. Here, "peripheral wall surface 370 of the extension portion 37" refers to an outer wall surface extending along the height direction of the extension portion 37 (the vertical direction in the drawings). For example, if the support 3 is a rectangular plate-shaped member, the peripheral wall surface 370 of the support 3 includes four side wall surfaces, each of which is parallel to the height direction of the support 3 (the vertical direction in the drawings). If the support 3 is cylindrical, the peripheral wall surface 370 of the support 3 is a cylindrical surface. Naturally, the support 3 may have an irregular structure.

[0103] Specifically, in an embodiment in which the insulating member 4 is hot-melt connected to the support 3, the insulating member 4 is hot-melt connected to the peripheral wall surface 370 of the support 3 to form a connection mark 401, and the connection mark 401 may be an annular structure extending along the circumferential direction of the support 3, and may include a plurality of connection structures spaced apart in the circumferential direction of the support 3.

[0104] More specifically, in an embodiment in which the battery core assembly 2 is a rectangular parallelepiped, the support 3 may be a rectangular plate-shaped member having a corresponding shape, the insulating member 4 wraps around the four side walls of the battery core assembly 2, and the insulating member 4 is hot-melt connected to the four side wall surfaces of the support 3, and a connection mark 401 is formed by the hot-melt connection between the insulating member 4 and each side wall surface of the support 3, thereby improving the reliability of the connection between the insulating member 4 and the support 3.

[0105] In the above technical solution, by connecting the insulating member 4 to the peripheral wall surface 370 of the support 3, the reliability of the connection between the insulating member 4 and the support 3 can be improved and the risk of the insulating member 4 falling off can be reduced.

[0106] Referring again to Figures 9 to 12, the peripheral wall surface 370 has a first step surface 371 and a second step surface 372, the second step surface 372 is located on the side of the first step surface 371 closer to the casing cover 112, the second step surface 372 is closer to the active material application portion 21 than the first step surface 371, and the insulating member 4 is connected to the second step surface 372.

[0107] In the above technical proposal, the peripheral wall surface 370 is configured to include the first step surface 371 and the second step surface 372, thereby providing an installation space for the insulating member 4, and by connecting the insulating member 4 to the second step surface 372, the risk of the connection structure between the insulating member 4 and the second step surface 372 rubbing against the casing 11 and falling off is reduced, and the reliability of the connection between the insulating member 4 and the support 3 is further improved.

[0108] In some embodiments, the first stepped surface 371 is farther from the active material-applied portion 21 than the outer surface of the insulating member 4. In other words, the first stepped surface 371 is beyond the connection position between the support 3 and the insulating member 4. In the process of installing the battery core assembly 2 with the support 3 in the casing 11, first, the support 3 enters the casing main body 111 through the opening 1110, and then the active material-applied portion 21 with the insulating member 4 wrapped around it enters the casing main body 111 through the opening 1110.

[0109] Since the first step surface 371 is farther from the active material application portion 21 than the outer surface of the insulating member 4, during the process of attaching it to the casing, the first step surface 371 not only protects the edges of the insulating member 4 and the edges of the active material application portion 21, reducing the occurrence of the phenomenon in which the edges of the insulating member 4 and the edges of the active material application portion 21 rub against the inner wall of the casing 11, but also protects the connection position between the insulating member 4 and the second step surface 372, reducing the risk that the connection structure between the insulating member 4 and the second step surface 372 will rub against the casing 11 and fall off, and further improving the reliability of the connection between the insulating member 4 and the support 3.

[0110] Referring again to FIG. 15, the battery cell 10 further includes an insulating member 4, which encases the active material applied portion 21 and is connected to the surface of the main body portion 36 that is remote from the casing cover 112.

[0111] By connecting at least a portion of the insulating member 4 to the wall of the main body 36 facing away from the battery core assembly 2, on the one hand, during the process of installing the battery core assembly 2 with the support 3 inside the casing 11, the casing 11 does not rub against the edge of the insulating member 4, and the connection position between the insulating member 4 and the main body 36 does not rub either, and the connection position between the two is not easily separated during the process of installing the battery core assembly 2 to the casing. This reduces the movement and slippage of the insulating member 4 during the process of installing the battery core assembly 2 to the casing, improves the reliability of the connection between the insulating member 4 and the support 3, and reduces the risk of the insulating member 4 falling off. This in turn reduces the risk of corrosion of the casing 11, the risk of failure of the battery core assembly 2 itself, and the risk of leakage due to exposure of the battery core assembly 2. It also improves the reliability and stability of the battery cells 10. Furthermore, by connecting at least a portion of the insulating member 4 to the wall of the main body 36 facing away from the battery core assembly 2, the insulating member 4 can be designed to be longer and can be applied to battery core assemblies 2 of different sizes, resulting in higher compatibility and improved manufacturability. On the other hand, after the support 3 and the battery core assembly 2 are installed in position within the casing 11, the insulating member 4 is pressed between the wall surface facing the opening 1110 of the casing 11 and the main body 36, thereby further reducing the risk of the insulating member 4 falling off and reducing the risk of the battery core assembly 2 failing due to exposure, while at the same time reducing the risk of corrosion of the casing 11 and improving the reliability and stability of the battery cell 10.

[0112] According to some optional embodiments of the present application, the insulating member 4 is continuously connected in a ring shape in the circumferential direction of the wall surface of the main body portion 36 that faces away from the battery core assembly 2. The ring-shaped connection here means that the connection position between the insulating member 4 and the main body portion 36 extends along the circumferential direction of the main body portion 36 to form a sealed ring.

[0113] By installing it in this manner, the connection area between the insulating member 4 and the support 3 is increased, improving the reliability and stability of the connection between the insulating member 4 and the support 3 in the circumferential direction of the support 3, further reducing the risk of the insulating member 4 falling off, and further improving the reliability of the attachment of the battery core assembly 2 to the casing, thereby ensuring the reliability and stability of the battery cells 10.

[0114] In the embodiment of the present application, the insulating member 4 is connected to the support 3 at intervals in the circumferential direction of the wall surface facing away from the battery core assembly 2. That is, there are multiple connection positions between the insulating member 4 and the support 3, and the multiple connection positions are spaced apart in the circumferential direction of the support 3. By ensuring the reliability and stability of the connection between the insulating member 4 and the support 3 in the circumferential direction of the support 3, it is possible to save on connection materials, reduce material costs, simplify the connection steps, and improve manufacturing efficiency.

[0115] Of course, in other embodiments of the present application, the wall surfaces of the insulating member 4 and the support 3 that are away from the battery core assembly 2 may be continuously connected in a circumferential ring shape. Here, the "ring-shaped connection" means that the connection between the insulating member 4 and the support 3 extends along the circumferential direction of the support 3 to form a closed ring. This arrangement increases the connection area between the insulating member 4 and the support 3, improving the reliability and stability of the connection between the insulating member 4 and the support 3 in the circumferential direction of the support 3, further reducing the risk of the insulating member 4 falling off, further improving the reliability of the attachment of the battery core assembly 2 to the casing, and ensuring the reliability and stability of the battery cells 10.

[0116] In addition, in other embodiments of the present application, the connection positions between the insulating member 4 and the support 3 may be installed on opposite sides of the support 3, adjacent sides, or concentrated on multiple sides, and specifically may be selected according to the actual shapes of the battery core assembly 2 and the support 3, and are not limited here.

[0117] Referring again to Figure 15, in the embodiment of the present application, the connection method between the insulating member 4 and the support 3 may be a hot melt connection, and the insulating member 4 is hot melt connected to the wall surface of the support 3 away from the battery core assembly 2 to form a connection mark 401, the position of the connection mark 401 is not limited by space, and compared with the related art, the area of ​​the connection mark 401 may be designed to be larger to make the connection stronger and reduce the risk of the insulating member 4 falling off.

[0118] Specifically, in the embodiment of the present application, the number of connection marks 401 is plural, and the connection marks 401 are spaced apart in the circumferential direction of the wall surface of the support 3 that faces away from the battery core assembly 2. In other embodiments of the present application, the connection marks 401 may extend annularly in the circumferential direction of the wall surface of the support 3 that faces away from the battery core assembly 2, in order to strengthen the connection between the insulating member 4 and the support 3, sufficiently improve the reliability of the connection between the insulating member 4 and the support 3, and reduce the risk of the insulating member 4 falling off.

[0119] It should be noted that in the embodiments of the present application, the shape of the connection mark 401 may be rectangular, circular, elliptical, or irregular. The arrangement of the connection marks 401 may be selected according to the actual shapes of the battery core assembly 2 and the support 3. For example, if the cross-sectional shapes of the battery core assembly 2 and the support 3 are square or rectangular, the connection marks 401 may be distributed near the four sides of the support 3, or may be concentrated near the opposing sides of the support 3. For example, if the cross-sectional shapes of the battery core assembly 2 and the support 3 are circular, the connection marks 401 may be uniformly distributed in the circumferential direction of the wall of the support 3 that is away from the battery core assembly 2.

[0120] Of course, the distribution pattern of the multiple connection marks 401 is not limited to the above pattern, and the spacing between two adjacent connection marks 401 may be adjusted according to needs, and the number of connection marks 401 may be appropriately increased to save materials and reduce costs while ensuring the reliability of the connection between the insulating member 4 and the support 3.

[0121] While the battery core assembly 2 is described as a rectangular parallelepiped in the example, in the embodiments of the present application, the support 3 may be a rectangular plate-like member having a corresponding shape, and the support 3 is installed on one wall of the battery core assembly 2, and the insulating member 4 wraps around the remaining five circumferential walls of the battery core assembly 2 to ensure the insulating effect between the battery core assembly 2 and the casing 11. At the same time, the connection marks 401 formed by the insulating member 4 and the wall of the support 3 away from the battery core assembly 2 may be installed adjacent to the circumferential edge of the support 3, and may be adjacent to two, three, or four circumferential edges of the support 3. The number of connection marks 401 formed by connecting the insulating member 4 near the corresponding edges may be increased or decreased according to the dimensions of the corresponding edges, and is not limited to any particular embodiment of the present application.

[0122] In the above technical solution, on the one hand, the hot melt connection facilitates the fitting of the insulating member 4 and the support 3, improves assembly efficiency, ensures the efficiency of mounting the battery core assembly 2 to the casing, and saves assembly and manufacturing costs; on the other hand, regardless of whether the connection marks 401 extend annularly or are spaced apart circumferentially, it can improve the robustness of the connection between the insulating member 4 and the support 3, improve the reliability and stability of the connection between the insulating member 4 and the support 3, and sufficiently reduce the risk of the insulating member 4 falling off; at the same time, by arranging the connection marks 401 at intervals circumferentially compared to when they extend annularly, it can also save materials and reduce costs by ensuring the reliability of the connection between the insulating member 4 and the support 3.

[0123] Referring again to Fig. 13 and further to Figs. 16 and 17, Fig. 16 is a structural schematic diagram of the support 3 of the battery cell 10 according to some embodiments of the present application. Fig. 17 is a structural schematic diagram of the support 3 of the battery cell 10 according to some other embodiments of the present application. To facilitate connection of the conductive portion 22 to the electrode post 12 from the side of the active material coated portion 21 that is close to the support 3, in the embodiments of the present application, the conductive portion 22 is connected to the side that is close to the main body portion 36 of the active material coated portion 21, and the main body portion 36 has a through hole 311, and the conductive portion 22 passes through the through hole 311 and is connected to the electrode post 12.

[0124] Here, the shape of through hole 311 can be selected depending on the shape of conductive portion 22. For example, the cross-sectional shape of the portion of conductive portion 22 that needs to extend into through hole 311 is elongated, and the shape of through hole 311 may be a regular shape such as a square, rectangle, ellipse, or oval, or may be an irregular shape. Also, for example, the cross-sectional shape of the portion of conductive portion 22 that needs to extend into through hole 311 is circular, and the shape of through hole 311 may be a circle, and a shape such as a square or oval may be selected.

[0125] It is understood that the outer surface of the conductive portion 22 may be in direct contact with the wall of the through hole 311, or there may be a gap between the outer surface of the conductive portion 22 and the wall of the through hole 311, and that the through hole 311 may simply pass through the conductive portion 22, as long as it ensures that the conductive portion 22 is not damaged.

[0126] In the above technical solution, on the one hand, by providing the through-holes 311 in the main body 36, the support 3 can play the role of converging and accommodating the conductive parts 22, facilitating the connection between the conductive parts 22 and the poles 12 and improving the reliability and convenience of assembling the battery cell 10; on the other hand, because the support 3 converges the conductive parts 22, the original plastic member structure of the battery cell 10 can be omitted, and the fitting of the support 3 with the insulating member 4 can achieve insulation between the entire active material application part 21 and the casing 11, thereby effectively reducing manufacturing and production costs.

[0127] Of course, the conductive portion 22 may be located on one side of the support 3 , and the conductive portion 22 has no mating relationship with the support 3 .

[0128] In some embodiments of the present application, the support 3 may have an integral structure or a separate structure. Referring to FIG. 16 , when the support 3 has an integral structure, the through-hole 311 is formed as a through-hole penetrating the support 3. This makes the support 3 of an integral structure easier to process, relatively reliable, and facilitates assembly of the support 3 and the casing assembly 1, improving assembly efficiency and fitting stability. As will be understood, the processing method for the support 3 can be specifically selected depending on the material of the support 3. For example, when the support 3 is made of an insulating plastic member, the support 3 of an integral structure can be obtained by injection molding.

[0129] Referring to FIG. 17, when the support 3 is a separate structure, the support 3 may include a first support 33 and a second support 34 that are molded separately, and a through hole 311 is defined between the first support 33 and the second support 34.

[0130] In the present embodiment, the first support 33 and the second support 34 are both elongated plate-like structures, and may be detachably connected; for example, they may be fitted together by insertion or engagement, facilitating assembly. At the same time, the first support 33 has a semi-perforated structure on the side adjacent to the second support 34, and the second support 34 has another semi-perforated structure matching the shape on the side adjacent to the first support 33. The semi-perforated structures of the first support 33 and the second support 34 collectively surround the annular through-hole 311. That is, the through-hole 311 is defined between the first support 33 and the second support 34.

[0131] In the above technical solution, the through hole 311 is defined by the engagement between the first support 33 and the second support 34, and when the support 3 is assembled to the battery core assembly 2, there is no need to pass the conductive part 22 through the through hole 311 from one end to the other. The first support 33 and the second support 34 can be assembled at the position of the conductive part 22 to clamp the conductive part 22, as the through hole 311 surrounds the conductive part 22, which makes it easier to assemble the support 3 and the battery core assembly 2 and improves assembly efficiency.

[0132] As an alternative solution, when the cross section of the through hole 311 is elongated, the first support 33 and the second support 34 are respectively arranged on both sides of the width of the through hole 311; for example, when the width of the through hole 311 is the left-right direction, the first support 33 and the second support 34 are located on the left and right sides of the through hole 311, making it easier to fit the first support 33 and the second support 34 to the conductive part 22.

[0133] 18, which is a schematic cross-sectional view of a battery cell 10 according to some embodiments of the present application. A receiving groove 393 is formed on the side of the main body 36 away from the active material coated portion 21. The receiving groove 393 communicates with the through-hole 311 and is used to receive at least a portion of the electrode post 12.

[0134] Here, the shape of the receiving groove 393 can be adapted to the shape of the polar post 12. For example, when the cross-sectional shape of the polar post 12 is elongated, the shape of the receiving groove 393 may be a regular shape such as a square, rectangle, ellipse, or oval, or may be an irregular shape. For example, when the cross-sectional shape of the polar post 12 is circular, the shape of the receiving groove 393 may be a circle, square, oval, or other shape.

[0135] The outer surface of the pole 12 may be in direct contact with the side wall of the accommodating groove 393, or there may be a gap between the outer surface of the pole 12 and the side wall of the accommodating groove 393. It is understood that at least a portion of the pole 12 may be accommodated in the accommodating groove 393, as long as it is ensured that the pole 12 is not damaged.

[0136] In the above technical solution, on the one hand, the receiving groove 393 receives at least a portion of the electrode post 12, making the overall structure of the battery cell 10 more compact and reliable, which is beneficial to improving the energy density of the entire battery 100; on the other hand, the provision of the receiving groove 393 allows the electrode post 12 and the casing 11 to be partially insulated by the support 3, further improving the stability and reliability of the battery cell 10; and the receiving groove 393 receives the electrode post 12, which improves the stability and reliability of the electrode post 12, thereby further improving the stability and reliability of the battery cell.

[0137] Referring again to Figure 18, a positioning portion 32 is provided on the side of the main body portion 36 that is away from the active material application portion 21, and the positioning portion 32 is provided around the circumferential direction of the through hole 311 and extends in a direction approaching the pole 12.

[0138] In some embodiments, the positioning portion 32 may be an annular boss extending along the circumferential direction of the through hole 311. In other embodiments, the positioning portion 32 may include two boss structures disposed opposite each other, the two boss structures being located on either side of the through hole 311. For example, the through hole 311 may form an elongated hole, and the two boss structures may be disposed opposite each other in the width direction of the elongated hole, with each boss structure extending along the length direction of the elongated hole.

[0139] In the above technical solution, by installing the positioning portion 32, during the assembly process of the support 3 and the electrode post 12, the positioning portion 32 can be fitted into the through-hole 311 to position and attach the support 3 and the electrode post 12, which is advantageous to improving the assembly efficiency of the battery cell 10. When the conductive portion 22 passes through the through-hole 311, the positioning portion 32 can restrain, converge, or support the conductive portion 22, facilitating the connection between the conductive portion 22 and the electrode post 12 and improving the assembly efficiency and assembly quality of the battery cell 10.

[0140] 18 again, the pole 12 is provided with a housing portion 121, at least a portion of the conductive portion 22 is housed in the housing portion 121, and at least a portion of the positioning portion 32 extends into the housing portion 121 and is used to guide the conductive portion 22 to be housed in the housing portion 121. In other words, the pole 12 is installed as a hollow structure.

[0141] In the above technical solution, on the one hand, the pole 12 is provided with a hollow structure, and the positioning portion 32 is fitted into the hollow structure, thereby guiding the conductive portion 22 so that it is connected to the pole 12, improving connection reliability and ensuring assembly efficiency and quality; on the other hand, the conductive portion 22 can be fitted into the receiving portion 121, improving assembly efficiency of the conductive portion 22 and saving the space occupied by the conductive portion 22. By fully utilizing the space of the battery cell 10, the fit between the support 3 and the pole 12 and between the support 3 and the conductive portion 22 is tighter and more reliable, making the structure of the battery cell 10 more compact and more advantageous for improving the energy density of the battery cell 10. Furthermore, the fit between the positioning portion 32 and the receiving portion 121 allows the support 3 and the pole 12 to be positioned and attached, which is advantageous for improving assembly efficiency of the battery cell 10.

[0142] 18 again, and further to FIG. 19, which is a structural cross-sectional view of the support 3 of a battery cell 10 according to some embodiments of the present application. A guide groove 312 communicating with the through hole 311 is formed on the side of the main body 36 facing the active material coated portion 21, and the guide groove 312 accommodates at least a portion of the conductive portion 22, with the cross-sectional area of ​​the guide groove 312 gradually increasing along the direction approaching the active material coated portion 21 of the main body 36.

[0143] Specifically, the groove wall of the guide groove 312 may be an inclined surface or an arcuate surface extending from the inside to the outside in the direction approaching the active material application portion 21, and here, "inside" refers to a position close to the center of the guide groove 312, and conversely, "outside" here refers to a position away from the center of the guide groove 312, i.e., a position close to the edge of the guide groove 312.

[0144] The guide groove 312 can not only accommodate the conductive portion 22, but also retract the conductive portion 22 and prevent the conductive portion 22 from being crushed, thereby reducing the probability of the conductive portion 22 becoming loose or folded over, and reducing redundancy.

[0145] 20 and 21, Fig. 20 is a top view of the support 3 of the battery cell 10 according to some embodiments of the present application. Fig. 21 is a top view of the support 3 of the battery cell 10 according to some other embodiments of the present application. In some embodiments, the support 3 has at least one first liquid injection guide groove 392, and the first liquid injection guide groove 392 is located on the side of the support 3 facing the active material coated portion 21.

[0146] During injection, the electrolyte flows along first injection guide groove 392, providing a path for the electrolyte to penetrate, and first injection guide groove 392 increases the fluidity of the electrolyte, improving the injection speed and shortening the time for leaving the electrolyte for chemical formation. Furthermore, the provision of first injection guide groove 392 increases the contact area between the electrolyte and active material-coated portion 21, thereby alleviating the problem of poor penetration of active material-coated portion 21.

[0147] Here, at least one first liquid injection guide groove 392 is connected to the guide groove 312, and the electrolyte that flows into the casing 11 can flow along the first liquid injection guide groove 392 toward the guide groove 312, allowing the electrolyte to flow to a predetermined position, further increasing the contact area between the electrolyte and the active material application portion 21.

[0148] Referring again to FIG. 20, in an embodiment in which the support 3 has an integral structure and two poles 12 are installed in the casing 11, both ends of the first liquid injection guide groove 392 can correspond to the positions of the two poles 12, respectively, and both ends of the first liquid injection guide groove 392 are connected to the two guide grooves 312, respectively, so that the electrolyte can flow along the first liquid injection guide groove 392 toward the two guide grooves 312.

[0149] Referring again to FIG. 21 , in an embodiment in which the support 3 has a separate structure and two electrode posts 12 are installed in the casing 11, the support 3 may include a first support 33 and a second support 34 that are separately molded, a through hole 311 is defined between the first support 33 and the second support 34, and the first support 33 and the second support 34 are each provided with at least one first liquid injection guide groove 392, both ends of which may correspond to the positions of the two electrode posts 12, and both ends of the first liquid injection guide groove 392 are connected to the two guide grooves 312, so that the electrolyte can flow along the first liquid injection guide groove 392 toward the two guide grooves 312.

[0150] In some embodiments, a second liquid injection guide groove (not shown) may be provided on the support 3 according to needs, and the second liquid injection guide groove is located on the side of the support 3 facing away from the active material-coated portion 21. By providing such an arrangement, during injection, the electrolyte flows along the first liquid injection guide groove 392 and / or the second liquid injection guide groove, providing a permeation path for the electrolyte and increasing the fluidity of the electrolyte, thereby improving the injection speed and shortening the anodization standing time.

[0151] It should be noted that in the embodiments of the present application, the depth of the first liquid injection guide groove 392 and / or the second liquid injection guide groove is 0.1 mm or more. For example, the depth of the first liquid injection guide groove 392 and / or the second liquid injection guide groove may be 0.1 mm, 0.2 mm, 0.5 mm, etc., and may be specifically selected according to actual needs.

[0152] 17 again, in the embodiment of the present application, the conductive portion 22 is connected to the side of the active material coated portion 21 that is close to the support 3, the electrode post 12 is provided with a receiving portion 121, and at least a portion of the conductive portion 22 is received in the receiving portion 121, which is used to guide the conductive portion 22 to be received in the receiving portion 121 and to facilitate the electrical connection and fitting between the conductive portion 22 and the electrode post 12. In other words, the electrode post 12 is installed as a hollow structure.

[0153] Here, "at least a portion" means that the conductive portion 22 may be completely housed in the housing portion 121, or that only a portion of the conductive portion 22 may be housed in the housing portion 121. Because the housing portion 121 is provided in the pole 12, the hollow structure of the housing portion 121 can reduce the weight of the pole 12 to some extent, thereby improving the weight-energy density of the battery cell 10 and the battery 100. At the same time, by installing the pole 12 as a hollow structure and fitting the positioning portion 32 into the hollow structure, the conductive portion 22 can be guided to connect to the pole 12, improving connection reliability and ensuring assembly efficiency and quality. On the other hand, the conductive portion 22 can be accommodated in the receiving portion 121, improving assembly efficiency of the conductive portion 22 and saving the space occupied by the conductive portion 22. By fully utilizing the space of the battery cell 10, the fit between the support 3 and the pole 12 and between the support 3 and the conductive portion 22 is tighter and more reliable, making the structure of the battery cell 10 more compact and more advantageous for improving the energy density of the battery cell 10.

[0154] 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.

[0155] 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.

[0156] 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 away from the active material coated portion 21 of the pole 12.

[0157] 22 and 23, for example. Fig. 22 is a schematic cross-sectional view of a battery cell 10 according to some embodiments of the present application. Fig. 23 is a schematic cross-sectional view of a battery cell 10 according to some embodiments of the present application. When the accommodating portion 121 is located on the side facing the active material coated portion 21 of the electrode post 12, the accommodating portion 121 includes a first accommodating groove 12110, the surface of the electrode post 12 facing the active material coated portion 21 is the electrode post inner end surface 122, the groove opening of the first accommodating groove 12110 is formed in the electrode post inner end surface 122, and at least a portion of the conductive portion 22 is accommodated in the first accommodating groove 12110.

[0158] 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.

[0159] 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.

[0160] 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, because the first accommodating groove 12110 opens toward the active material application portion 21, the first accommodating groove 12110 can be used as a buffer 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, because the first accommodating groove 12110 opens toward the active material application portion 21, the first accommodating groove 12110 can also be used as a buffer and storage structure for gas generated inside the battery core assembly 2, which can reduce the expansion of the battery cell 10 and improve the reliability and stability of the battery cell 10.

[0161] 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 battery core assembly 2, improving the stability and reliability of the operation of the battery core assembly 2 and further improving the stability and reliability of the battery cell 10 and the battery 100.

[0162] 22 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 mounting hole 113, and the terminal post 12 is attached to the mounting hole 113 by riveting. Of course, as can be understood, when the two are fitted together by welding or another method, the casing 11 may be provided with the mounting hole 113 so that the terminal post 12 can be easily attached to the casing 11 through the mounting hole 113, and the method is not limited here.

[0163] At the same time, the first accommodating groove 12110 can be installed corresponding to the position of the mounting hole 113; in other words, on a projection plane perpendicular to the axial direction R of the pole 12, the orthogonal projection of the first accommodating groove 12110 is located within the orthogonal projection range of the mounting hole 113. 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.

[0164] Specifically, when a mounting hole 113 is opened in the casing 11 and the pole 12 is mounted in the mounting hole 113, the depth H1 of the first accommodating groove 12110 along the axial direction R of the pole 12 is greater than or equal to the minimum distance H2 from the pole inner end face 122 to the mounting hole 113.

[0165] 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, or a semi-elliptical groove having an elliptical cross section with gradually varying cross-sectional dimensions. 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.

[0166] In the axial direction R of the pole 12, the depth H1 of the first accommodating groove 12110 is equal to or greater than the minimum distance H2 from the pole inner end surface 122 to the mounting hole 113. This allows full utilization of the volume of the pole 12, 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 is relatively deep, which allows it to accommodate gas generated by the battery core assembly 2 and ensure the reliability and stability of the battery cell 10. It can also accommodate more electrolyte to ensure the service life of the battery cell 10.

[0167] Referring again to Figures 22 and 23, in order to ensure 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 can be located on the groove wall of the first accommodating groove 12110 formed by the accommodating portion 121.

[0168] For example, the conductive portion 22 and the terminal post 12 may be electrically connected by welding, and the electrical connection position is the welding 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 welding portion, vertical welding, oblique welding, lap welding, edge welding, etc. may be selected. In other embodiments of the present application, the electrical connection between the conductive portion 22 and the terminal post 12 may be achieved 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, as an example, the electrical connection between the conductive portion 22 and the terminal post 12 and the welding position being the electrical connection position between the conductive portion 22 and the terminal post 12.

[0169] 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 side of the first side wall 12113 away 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 electrical connection 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.

[0170] In the above technical solution, the electrical connection position between the conductive portion 22 and the pole 12 is located on at least one of the first end wall 12111 and the first side wall 12113. This allows the first receiving groove 12110 to receive at least a portion of the conductive portion 22, and the groove wall of the first receiving groove 12110 to establish the electrical connection with the conductive portion 22. This simplifies the structure of the pole 12, facilitating its processing, and also simplifies the structure of the conductive portion 22, reducing the redundancy of the conductive portion 22 and reducing the cost of the conductive portion 22. Furthermore, using the groove wall of the first receiving groove 12110 to establish the electrical connection with the conductive portion 22 allows for a relatively large electrical connection area between the conductive portion 22 and the pole 12. This not only simplifies the difficulty of the electrical connection, but also improves the reliability and stability of the electrical connection, thereby improving the performance of the battery cell 10.

[0171] 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.

[0172] In addition, in the embodiments of the present application, the first end wall 12111 is configured as a sealed structure without any through holes in order to isolate the first accommodating groove 12110 from the external space of the casing 11, thereby avoiding the problem of the electrolyte in the casing 11 leaking from the first accommodating groove 12110.

[0173] 22 and 23, in some alternative embodiments, the local shape of the conductive portion 22 is adapted to the local shape of the first end wall 12111, and the conductive portion 22 is bonded to the first end wall 12111 so that the electrical connection position between the conductive portion 22 and the first end wall 12111 extends in the length direction or width direction 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 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.

[0174] 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 side of the first accommodating groove 12110 away from the active material application portion 21, making the welding work easier, and for example, welding may be performed from the side of the pole 12 away from the active material application portion 21.

[0175] 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. Here, when the first end wall 12111 has a flat structure, the first end wall 12111 is disposed at an angle with 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.

[0176] 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.

[0177] 24, which 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 a direction away from 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.

[0178] In the above technical solution, on the one hand, the first sunken groove 12112 can be used to pre-position and limit the position of the conductive part 22 at the electrical connection position, 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 ensuring 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 the first end wall 12111 can be locally thinned, which is advantageous not only for welding but also for reducing the weight of the electrode post 12 and improving the weight-energy density of the battery cell 10.

[0179] Referring again to Figures 23 and 24, in the embodiment of the present application, a first groove 126 may be further provided in the pole 12 according to needs, and the first groove 126 is located on the side of the pole 12 away from the active material application portion 21, i.e., the surface of the pole 12 away from 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.

[0180] As can be understood, the first groove 126 is a groove body, and the groove body is a groove-like structure with a certain depth. When the pole 12 is installed on the upper end wall of the casing 11 and the pole outer end surface 123 is the upper surface of the pole 12, the first groove 126 has an opening upward and a groove wall that is recessed downward (i.e., adjacent to the battery core assembly 2). direction For example, when the pole 12 is installed on the lower end wall of the casing 11 and the pole outer end surface 123 is the lower surface of the pole 12, the first groove 126 has an opening downward and a groove wall recessed upward (i.e., facing away from the battery core assembly 2). direction The first groove is formed as a recessed groove (recessed toward the first groove).

[0181] 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 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 side of the pole 12 that is away 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.

[0182] Furthermore, by simultaneously providing the first receiving groove 12110 and the first groove 126 in the electrode post 12, the first groove 126 is located on the side of the first receiving groove 12110 away from the active material applied portion 21, and the first groove 126 opens in a direction away 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 of the electrode post 12 away from the active material applied portion 21. That is, the electrical connection between the conductive portion 22 and the electrode post 12 can be easily achieved by external welding. In other words, the above structure and installation 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.

[0183] Furthermore, in order to easily and effectively weld the conductive portion 22 and 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 spacing portion 127 shown in Figure 24 can be laser welded to the conductive portion 22 to realize an electrical connection between the battery core 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.

[0184] In some embodiments, the first accommodating groove 12110 may be configured with a cross-sectional shape whose length is greater than its width, such as a rectangle, oval, or racetrack shape, and the weld mark formed by welding the conductive portion 22 to the terminal post 12 may be an elongated weld mark parallel to the length direction of the first accommodating groove 12110 to improve the reliability of the weld and increase the current passing capacity. For example, when an elongated weld mark is formed by welding the conductive portion 22 to the first end wall 12111, the width of the weld mark may be 6 mm or more, and the distance between the weld mark and the first side wall 12113 may be 1 mm or more to ensure the convenience and reliability of the weld and maintain the current passing capacity of the battery cell 10.

[0185] Referring again to FIG. 23, the battery cell 10 may further include a groove cover 7, which is provided on the pole 12 and seals the opening of the first groove 126.

[0186] In the above technical solution, by installing a groove cover 7 to seal the first groove 126, the electrode post 12 can achieve an 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, installing the groove cover 7 facilitates the 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 cells 10.

[0187] For example, refer to Figure 25, 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 facing away from the active material application portion 21 is the pole outer end surface 123, the groove opening of the second accommodating groove 12120 is formed in the pole outer end surface 123, the second accommodating groove 12120 communicates with the inside of the casing 11 through a through hole 12130, and the conductive portion 22 is drilled in the through hole 12130 and at least a portion of it is accommodated in the second accommodating groove 12120.

[0188] 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.

[0189] 25 again, in the above technical solution, on the one hand, by providing the second accommodating groove 12120 on the pole 12, the weight of the pole 12 can be reduced to a certain extent, and the weight energy density of the battery cell 10 and the battery 100 can be improved; on the other hand, the groove opening of the second accommodating groove 12120 is formed on the pole outer end surface 123, and the pole outer end surface 123 is the surface that is away from the active material application portion 21 of the pole 12, so the second accommodating groove 12120 can In this way, when at least a portion of the conductive portion 22 is accommodated in the second accommodating groove 12120, the conductive portion 22 can be easily accommodated and organized through the groove opening of the second accommodating groove 12120, and electrical connection operations between the conductive portion 22 and the pole 12 can be easily performed through the groove opening of the second accommodating groove 12120, thereby reducing the difficulty of manufacturing the battery cell 10 and improving the manufacturing efficiency of the battery cell 10.

[0190] 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, the more electrolyte there is, the longer the service life of the battery cell 10 can be. 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 battery core assembly 2, which can reduce the expansion of the battery cell 10 and improve the reliability and stability of the battery cell 10.

[0191] It should be noted that when the accommodating portion 121 has a second accommodating groove 12120, the conductive portion 22 is drilled in 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 pole 12 is not limited.

[0192] For example, when the conductive portion 22 is drilled in the through hole 12130 and at least partially 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 pole 12 is located on the hole wall of the through hole 12130 formed by the pole 12.

[0193] 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 realize sealing of the through hole 12130, thereby saving sealing costs and reducing electrolyte leakage and saving sealing parts.

[0194] 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 welding imprint can be controlled to achieve sealing of the through hole 12130 by the welding mark and the conductive part 22.

[0195] Furthermore, for example, when the conductive portion 22 is drilled in the through-hole 12130 and at least partially received in the second receiving groove 12120, in some other embodiments of the present application, the electrical connection position between the conductive portion 22 and the electrode post 12 can be located on the groove wall of the second receiving groove 12120 formed by the electrode post 12. This facilitates the electrical connection operation and, for example, when the conductive portion 22 is welded to the groove wall of the second receiving 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.

[0196] Referring again to Figure 25, 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.

[0197] 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.

[0198] For the sake of simplicity, the following description will be given taking as an example the conductive portion 22 and the electrode post 12 form an electrical connection, 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.

[0199] 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 receiving groove 12120 to not only receive at least a portion of the conductive portion 22, but also allows the groove wall of the second receiving 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 receiving 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 can be realized 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 ultimately improving the performance of the battery cell 10.

[0200] 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.

[0201] 25 again, in some embodiments, the local shape of the conductive portion 22 is matched to the local shape of the second end wall 12121, and the conductive portion 22 is bonded to the second end wall 12121 to establish an electrical connection between the conductive portion 22 and the second end wall 12121 along the length or width of the second end wall 12121. For example, if the second end wall 12121 is flat, the conductive portion 22 is also flat and bonded to the second end wall 12121, 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.

[0202] 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. Here, when the second end wall 12121 has a flat plate-like structure, the second end wall 12121 is disposed at an angle with the axial direction R of the pole post 12, and may be, for example, a flat plate-like structure perpendicular to the axial direction R of the pole post 12, or may be, for example, an inclined plate structure not perpendicular to the axial direction R of the pole post 12, but the inclination direction is not limited.

[0203] 25, 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.

[0204] 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, thereby 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° to 145°, and may be, for example, 100°, 110°, 120°, 130°, or 140°. 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.

[0205] Furthermore, for example, the angle θ between the second end wall 12121 and the axial direction R of the electrode post 12 is less than 90°. That is, the second end wall 12121 extends obliquely from the through hole 12130 to the second side wall 12123, away from the active material coated portion 21. This increases the extension distance of the conductive portion 22 along the second end wall 12121, thereby 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. 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.

[0206] 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.

[0207] Referring again to FIG. 25 and further to FIG. 26, FIG. 26 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 recessed groove 12122 can be provided in the second end wall 12121 according to needs. The second recessed groove 12122 is a recess formed by recessing a portion of the second end wall 12121 into one end adjacent to the active material application portion. 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 recessed groove 12122.

[0208] 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 attached and installed 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 ensuring the reliability and stability of the charging and discharging operations of the battery cell 10.

[0209] 26 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 mounting hole 113, and the terminal post 12 is attached to the mounting hole 113 by riveting. Of course, when the two are fitted together by welding or another method, it is understood that the casing 11 may have a mounting hole 113, and the terminal post 12 is attached to the mounting hole 113.

[0210] Optionally, referring again to FIG. 25, the second accommodating groove 12120 may be installed corresponding to the position of the mounting 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 mounting hole 113, so that the second accommodating groove 12120 has a relatively large depth and can accommodate more conductive parts 22, thereby significantly reducing the space occupied by the conductive parts 22 in the casing 11.

[0211] In some embodiments, referring again to FIG. 25 , when the casing 11 has a mounting hole 113 and the pole 12 is mounted in the mounting 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 surface 123 to the mounting hole 113.

[0212] 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, or a semi-elliptical groove having an elliptical cross section with gradually varying cross-sectional dimensions. 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.

[0213] 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 mounting 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 battery core assembly 2 and ensure the reliability and stability of the battery cell 10. It can also accommodate more electrolyte to ensure the service life of the battery cell 10.

[0214] Referring to Figure 36, and further to Figures 27 and 28, Figure 27 is a schematic local cross-sectional view of a battery cell 10 provided according to some embodiments of the present application, and Figure 28 is an exploded structural view of the battery cell 10 shown in Figure 27. In the embodiments of the present application, when the accommodating portion 121 has the second accommodating groove 12120 of any of the above embodiments, optionally, the battery cell 10 can further include a first cover plate 13, which is fitted to the pole 12 and seals the groove opening of the second accommodating groove 12120, and the first cover plate 13 is electrically connected to the pole 12.

[0215] In the above technical proposal, by installing the first cover plate 13 so as to seal the groove opening of the second accommodating groove 12120, it is possible to prevent the electrolyte in the casing 11 from leaking from the groove opening of the second accommodating groove 12120. Furthermore, since the first cover plate 13 seals the groove opening of the second accommodating groove 12120 and is electrically connected to the pole 12, it is possible to easily realize an indirect electrical connection between the pole 12 and the bus member using the first cover plate 13, which is advantageous for increasing the connection area of ​​the electrical connection point and therefore reducing the resistance of the electrical connection point.

[0216] It should be noted that the method and position of fitting the first cover plate 13 and the terminal post 12 are not limited as long as the groove opening of the second accommodating groove 12120 of the first cover plate 13 can be sealed. For example, in some embodiments, the first cover plate 13 may be welded to the terminal post 12, and during processing, the conductive portion 22 may first be passed through the through hole 12130 and welded to the groove wall of the second accommodating groove 12120, and then the first cover plate 13 and the terminal post 12 may be welded to seal the groove opening of the second accommodating groove 12120.

[0217] It should be further explained that the specific configuration of the first cover plate 13 is not limited. For example, in some optional embodiments, Fig. 29 is a structural exploded view of the first cover plate shown in Fig. 28, and with reference to Figs. 27 to 29, the first cover plate 13 includes a first conductive member 131 and a second conductive member 132 made of different materials, the first conductive member 131 is fitted to and electrically connected with the pole 12, and the second conductive member 132 is fitted to and electrically connected with the first conductive member 131.

[0218] In the above technical solution, the first 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, which facilitates electrical connection between the first conductive member 131 and the electrode post 12. For example, the first conductive member 131 can be easily and reliably connected to the electrode post 12 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 easily used to 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 and reliably connected to bus members made of the same material as the second conductive member 132 by welding.

[0219] For example, if the electrode post 12 is a negative electrode post, the electrode post 12 is a copper post, and the bus member is an aluminum sheet, the first conductive member 131 can be made of copper and the second conductive member 132 can be made of aluminum. 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 first cover plate 13. In addition, the electrode post 12 and the first conductive member 131 are welded together, which has excellent fluidity, is less likely to crack, and is advantageous for improving the sealing effect of the welded parts.

[0220] 27 to 29 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, and therefore the second accommodating groove 12120 and the second conductive member 132 can be 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 prevent the electrolyte in that portion from contacting the second conductive member 132, and the problem of corrosion of the second conductive member 132 by the electrolyte can be solved.

[0221] 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 FIGS. 27 to 29, the first conductive member 131 has a second groove 1311, the second conductive member 132 is fitted into the second groove 1311, and the groove opening of the second groove 1311 is formed on the surface of the first conductive member 131 away from the second receiving groove 12120 so that the second conductive member 132 is exposed from the groove 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.

[0222] As should be further explained, when the second conductive member 132 is "exposed" from the groove opening of the second groove 1311, it is sufficient 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 have 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 facing away from the second accommodating groove 12120, or the second conductive member 132 may protrude from the surface of the first conductive member 131 facing away from the second accommodating groove 12120.

[0223] In the above technical solution, the second conductive member 132 is fitted into the first conductive member 131, which reduces the difficulty of assembling the first conductive member 131 and the second conductive member 132 and improves the fitting stability and convenience of the first conductive member 131 and the second conductive member 132. It also reduces the thickness of the first cover plate 13, reduces the space occupied by the first cover plate 13, and improves 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 facing away from 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.

[0224] Furthermore, since the groove opening of the second groove 1311 is formed on the surface of the first conductive member 131 that is away from the second accommodating groove 12120, it is suggested that the second groove 1311 opens in the direction away from the active material application portion 21. As a result, 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 that has entered the second groove 1311 and the second conductive member 132, thereby reducing leakage of the electrolyte.

[0225] Of course, in other embodiments, the first cover plate 13 may not be a composite form made of multiple materials. For example, in other embodiments of the present application, Figure 30 is a schematic local cross-sectional view of a battery cell provided by some embodiments of the present application, and Figure 31 is an exploded structural view of the battery cell shown in Figure 30. Referring to Figures 30 and 31, the entire first cover plate 13 may also be in a non-composite form made of the same material, for example, to fit the positive pole, and the description thereof will be omitted here.

[0226] 27 to 29 again, in some embodiments, the first cover plate 13 is further fitted into the groove opening of the second accommodating groove 12120. In the above technical solution, fitting the first cover plate 13 into the second accommodating groove 12120 reduces the difficulty of assembling the first cover plate 13 and the electrode post 12, improves the assembly stability and connection reliability and convenience between the first cover plate 13 and the electrode post 12, and reduces the space occupied by the first cover plate 13 other than the electrode post 12. In addition, because the first cover plate 13 is fitted into the groove opening of the second accommodating groove 12120, the second accommodating groove 12120 has a relatively sufficient space for accommodating the conductive part 22.

[0227] Of course, in other embodiments of the present application, the method of fitting the first cover plate 13 and the pole 12 is not limited to being fitted into the second accommodating groove 12120, and the first cover plate 13 may also be directly fitted over the outside of the pole 12, that is, to facilitate fitting with 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 to this embodiment.

[0228] 27 to 29 , optionally, in the embodiment of the present application, at least a portion of the wall surface where the groove opening of the second accommodating groove 12120 of the terminal post 12 is formed is a guide slope 12126, which is used to guide the engagement between the groove opening of the second accommodating groove 12120 and the first cover plate 13. In the above technical solution, by processing the wall surface of the groove opening of the second accommodating groove 12120 into a slope having a guide function, it is possible to reduce the difficulty of assembling the first cover plate 13 and the second accommodating groove 12120 and improve the assembly efficiency of the first cover plate 13 and the second accommodating groove 12120. Furthermore, when the first cover plate 13 is welded to the guide slope 12126, the area of ​​the welded portion is increased, which improves the reliability of the welded connection between the first cover plate 13 and the terminal post 12 and also alleviates the problem of the collapse of the molten pool or the laser beam entering the terminal post 12 during welding.

[0229] 27 to 29, the second accommodating groove 12120 includes a first groove section 12124 and a second groove section 12125 located on the side of the first groove section 12124 that is closer to the pole outer end surface 123. Because the cross-sectional area of ​​the second groove section 12125 is larger than that of the first groove section 12124, the second accommodating groove 12120 is a stepped groove, and a third stepped surface 12127 is formed at the connection between the first groove section 12124 and the second groove section 12125. Therefore, when the first cover plate 13 is fitted into the second accommodating groove 12120, the first cover plate 13 is fitted into the second groove section 12125 and supported by the third stepped surface 12127.

[0230] In the above technical solution, by configuring the second accommodating groove 12120 in the form of a stepped groove, the first cover plate 13 can be stably fitted into the groove opening position of the second accommodating groove 12120, thereby improving the connection stability between the first cover plate 13 and the pole 12; and by limiting the groove depth of the first groove step 12124, a relatively sufficient space can be provided in the second accommodating groove 12120 to accommodate the conductive part 22.

[0231] Furthermore, when the wall surface where the groove mouth of the second accommodating groove 12120 of the pole post 12 is formed is the guide slope 12126, the cross-sectional area of ​​the second groove step 12125 is set to gradually increase along the direction approaching the pole post outer end surface 123, so that the side wall of the second groove step 12125 forms the guide slope 12126, thereby facilitating processing and satisfying the guide requirements simply and effectively.

[0232] 27 to 29 again, in the embodiments of the present application, the first cover plate 13 may further be provided with stress relief grooves 133 according to needs, and the stress relief grooves 133 are located in the outer circumferential region of the first cover plate 13 to help relieve stress on the first cover plate 13. In the above technical solution, the provision of the stress relief grooves 133 on the first cover plate 13 can relieve stress generated during the processing of the first cover plate 13 itself or during the electrical connection between the first cover plate 13 and the poles 12, so as to alleviate problems such as deformation and damage caused by stress on the first cover plate 13.

[0233] Specifically, when the first cover plate 13 is fitted into the second receiving groove 12120 and welded, the stress relief groove 133 relieves stress generated during welding, improves lateral heat conduction, and reduces the likelihood of damage or deformation of the first cover plate 13. At the same time, if the first cover plate 13 is a composite type including the first conductive member 131 and the second conductive member 132, the stress relief groove 133 is provided in the first conductive member 131 and located at the outer circumferential region of the second conductive member 132. Therefore, when the first conductive member 131 is fitted into the second receiving groove 12120 and welded, the stress relief groove 133 relieves stress generated during welding, improves lateral heat conduction, and reduces the likelihood of damage or deformation of the second conductive member 132. In addition, when the second conductive member 132 and the first conductive member 131 are fitted and welded, the stress relief groove 133 releases the stress generated by the welding, improves the lateral conduction of heat, and reduces the probability of deformation of the first conductive member 131 or the first conductive member 131 being unable to be fitted into the second accommodating groove 12120.

[0234] 30 to 31, in the embodiment of the present application, the battery cell 10 can also be provided with a second cover plate 14 according to needs, and the second cover plate 14 is installed to cover the outside of the through hole 12130 and is also located outside the conductive portion 22 of the second accommodating groove 12120.

[0235] It should be noted that if the battery cell 10 includes the second cover plate 14, the battery cell 10 may or may not also include the first cover plate 13. 0 When the cover plate 14 includes both the second cover plate 14 and the first cover plate 13, the first cover plate 13 may be a composite type using multiple types of materials, or a non-composite type using the same material.

[0236] In the above technical solution, at least a portion of the conductive portion 22 is located in the second accommodating groove 12120, and the second cover plate 14 covers that portion of the conductive portion 22. The second cover plate 14 also covers the through hole 12130. This alleviates the problem of the electrolyte in that portion overflowing from the pole 12 when the electrolyte enters the second accommodating groove 12120 through the through hole 12130, thereby improving the reliability of the battery cell 10.

[0237] 30 to 31 , when a portion of the conductive portion 22 is sandwiched between the second cover plate 14 and the second end wall 12121, laser welding can be used to weld together the three components of the portion of the conductive portion 22, the second cover plate 14, and the second end wall 12121, in order to improve the reliability of the connection between the pole post 12 and the conductive portion 22. Furthermore, because the second cover plate 14 can press the conductive portion 22, the second cover plate 14 can improve the stability with which the conductive portion 22 is accommodated in the second accommodating groove 12120.

[0238] 32, which is an assembly diagram of a battery cell 10 according to some embodiments of the present application. The number of openings 1110 on the casing body 111 is one, the casing cover 112 covers the opening 1110, and the support 3 is located at one end of the battery core assembly 2 away from the opening 1110.

[0239] Here, the opening 1110 can be located in the top wall, bottom wall, or side wall of the casing body 111. When the opening 1110 is located in the bottom wall of the casing body 111, the remaining walls are all sealed, and the battery core assembly 2 including the support 3 and the insulating member 4 can be installed into the casing body 111 only through the opening 1110. After the battery core assembly 2 is installed in place in the casing body 111, the casing cover 112 covers the opening 1110 to seal it, and the insulating member 4 is pressed between the top wall of the casing body 111 and the support 3, thereby reducing the risk of the insulating member 4 falling off and the risk of the battery core assembly 2 being damaged due to exposure, and at the same time, reducing the risk of corrosion of the casing 11, and improving the reliability and stability of the battery cell 10.

[0240] In the above technical solution, an opening 1110 is provided in the casing body 111, and the support 3 is provided at one end of the battery core assembly 2 away from the opening 1110. The battery core assembly 2 including the support 3 and the insulating member 4 can be installed in the casing body 111 only through the opening 1110. Since there is only one installation direction, this is advantageous for improving installation efficiency, and the casing 11 does not rub against the edge of the insulating member 4 or the connection position between the insulating member 4 and the support 3. This improves the reliability of the connection between the insulating member 4 and the support 3 and reduces the risk of the insulating member 4 falling off, thereby reducing the risk of corrosion of the casing 11 due to exposure of the battery core assembly 2, reducing the failure list of the battery core assembly 2 itself, and reducing the risk of leakage, and further improving the reliability and stability of the battery cell 10.

[0241] Alternatively, all of the poles 12 can be provided on the casing cover 112, i.e., all of the poles 12 are located on the side away from the support 3 of the battery core assembly 2, and the conductive portions 22 can be electrically connected to the poles 12 on the casing cover 112.

[0242] Alternatively, one of the poles 12 may be provided on the casing cover 112, and the other pole 12 may be provided on the end wall of the casing body 111 opposite the opening 1110, and one of the conductive portions 22 may be electrically connected from the pole 12 on the casing cover 112.

[0243] Alternatively, all of the poles 12 may be provided on the end wall of the casing body 111 facing the opening 1110, and the conductive portion 22 may pass through the support 3 and be electrically connected to the poles 12 on the end wall of the casing body 111.

[0244] 32 again, the casing body 111 has a mounting wall 1112 facing the opening 1110, and at least one electrode post 12 is provided on the mounting wall 1112. In this way, the battery core assembly 2 enters the casing body 111 along the opening 1110, and the conductive portion 22 directly faces the electrode post 12, so the conductive portion 22 can be connected to the electrode post 12 relatively easily, improving the assembly efficiency of the battery cell 10.

[0245] For example, the top wall of the casing body 111 is a mounting wall 1112, the bottom wall of the casing body 111 has an opening 1110, a casing cover 112 is provided at the bottom of the casing body 111, the battery core assembly 2 can be mounted in the casing body 111 from bottom to top along the Z direction, and the conductive part 22 can be easily connected to the pole 12.

[0246] 33, which is an assembly diagram of a battery cell 10 according to some other embodiments of the present application. The number of openings 1110 on the casing body 111 is two, and each opening 1110 is covered with a casing cover 112. The support 3 is located at one end of the battery core assembly 2 away from any opening 1110.

[0247] In the above technical solution, two openings 1110 are provided in the casing body 111, and a support 3 is provided at one end of the battery core assembly 2 away from any of the openings 1110. The battery core assembly 2 including the two supports 3 and the insulating member 4 can be installed into the casing body 111 through any of the openings 1110, and an appropriate installation direction can be selected according to needs. After the battery core assembly 2 is installed in place in the casing body 111, part of the insulating member 4 may be pressed between the wall facing one of the openings 1110 of the casing body 111 and the corresponding support 3, and another part of the insulating member 4 may be pressed between the wall facing the other opening 1110 of the casing body 111 and the corresponding support 3, which further reduces the risk of the insulating member 4 falling off and the risk of the battery core assembly 2 being damaged due to exposure. At the same time, this reduces the risk of corrosion of the casing 11 and improves the reliability and stability of the battery cells 10.

[0248] Here, the two openings 1110 may be located on the top wall, bottom wall, or side wall of the casing body 111. The two openings 1110 may be provided on two opposing walls of the casing body 111, for example, the two openings 1110 may be provided on the top wall and the bottom wall of the casing body 111, respectively, or for example, the two openings 1110 may be provided on two opposing side walls of the casing body 111. The two openings 1110 may be provided on two adjacent walls of the casing body 111, for example, the two openings 1110 may be provided on the adjacent top wall and the side wall of the casing body 111, respectively, or for example, the two openings 1110 may be provided on the adjacent bottom wall and the side wall of the casing body 111, respectively, or for example, the two openings 1110 may be provided on the adjacent side walls of the casing body 111.

[0249] When two openings 1110 are provided in two opposite walls of the casing body 111, the remaining walls are all sealed structures, one of the openings 1110 is covered by a first casing cover 1121 and the other opening 1110 is covered by a second casing cover 1122, and all of the poles 12 may be provided in the first casing cover 1121, or all of the poles 12 may be provided in the second casing cover 1122, or some of the poles 12 may be provided in the first casing cover 1121 or the second casing cover 1122, and the other part of the poles 12 may be provided in the casing body 111.

[0250] Referring again to Figure 33, the first casing cover 1121 and the second casing cover 1122 are each provided with one electrode post 12, and one support 3 is provided on each end of the battery core assembly 2. The battery core assembly 2 including the support 3 and the insulating member 4 can be installed in the casing body 111 through any of the openings 1110. After the battery core assembly 2 is installed in a predetermined position in the casing body 111, the two casing covers 112 cover the two openings 1110 respectively and seal the corresponding openings 1110. After the battery core assembly 2 including the two supports 3 is installed in the casing, one of the conductive parts 22 therein passes through one of the supports 3 and is electrically connected to the electrode post 12 on the first casing cover 1121, and the other conductive part 22 therein passes through the other support 3 and is electrically connected to the electrode post 12 on the second casing cover 1122.

[0251] In some embodiments, at least one pole 12 is installed on the casing wall of the casing 11 adjacent to the support 3. The battery core assembly 2 including the support 3 and the insulating member 4 enters the casing body 111 along the opening 1110, and the conductive portion 22 directly faces the pole 12, so that the conductive portion 22 can be easily connected to the pole 12, improving the assembly efficiency of the battery cell 10.

[0252] 3 to 6, a battery cell 10 according to a specific embodiment of the present invention will be described.

[0253] In the present embodiment, the battery cell 10 is a rectangular parallelepiped, with the height direction of the battery cell 10 being the first direction Z, the length direction of the battery cell 10 being the second direction X, and the thickness direction of the battery cell 10 being the third direction Y. The battery cell 10 includes a casing 11, which includes a casing body 111 and a casing cover 112. The casing body 111 has a rectangular ring structure, with one end of the casing body 111 in the first direction Z being open and the other end in the first direction Z being closed, and the casing cover 112 covering the open position of the casing body 111. Two electrode posts 12 are provided at the closed end of the casing body 111 in the first direction Z, and the two electrode posts 12 are spaced apart in the second direction X and are respectively a positive electrode post and a negative electrode post.

[0254] Each of the two poles 12 has a receiving portion 121, which includes a second receiving groove 12120. Specifically, very The pillar 12 includes a second end wall 12121 and a second side wall 12123, the second end wall 12121 being located on a side of the second side wall 12123 that is adjacent to the casing cover 112, and the second end wall 12121 and the second side wall 12123 surroundingly form a second receiving groove 12120; very The surface of the pole 12 facing away from the casing cover 112 is the pole outer end surface 123, the groove opening of the second accommodating groove 12120 is formed in the pole outer end surface 123, and a through hole 12130 is opened in the second end wall 12121.

[0255] The battery cell 10 further includes a battery core assembly 2, a support 3, and an insulating member 4, the battery core assembly 2 including an active material application portion 21 and a conductive portion 22, the active material application portion 21 being housed in a casing 11, the support 3 being provided at one end of the active material application portion 21 and being located between the sealed end of the casing body 111 and the active material application portion 21 along the first direction Z, the support 3 having two through holes 311, the two through holes 311 being spaced apart along the second direction X.

[0256] The support 3 has a main body portion 36 and an extension portion 37, and the extension portion 37 is provided on the peripheral side of the main body portion 36. The projection of the main body portion 36 onto the plane of the casing cover 112 is located within the projection of the active material application portion 21 onto the plane of the casing cover 112, and the projection of the extension portion 37 onto the plane of the casing cover 112 is located outside the projection of the active material application portion 21 onto the plane of the casing cover 112.

[0257] In the technical solution of the embodiments of the present application, an independent support 3 is used to replace the plastic member embedded under the top cover in the related art. The support 3 is fitted to the battery core assembly 2 and then attached to the casing together. During the process of attaching the battery core assembly 2 with the support 3 to the casing 11, the support 3 can restrain the active material application portion 21. In addition, the extension portion 37 protects the active material application portion 21, reducing the probability that the active material application portion 21 will come into contact with the casing 11 and minimizing the occurrence of the phenomenon in which the casing 11 damages the active material application portion 21. This improves the reliability of use of the battery cell 10, and simplifies the installation steps, which is beneficial to improving production efficiency.

[0258] According to some embodiments of the present application, the present application further provides a battery 100 including a battery cell 10 described in any of the above solutions.

[0259] In the above technical solution, since the battery cell 10 is installed in the battery 100, the support 3 can restrain the active material application portion 21, and in addition, the extension portion 37 protects the active material application portion 21, reduces the probability that the active material application portion 21 will come into contact with the casing 11, and minimizes the occurrence of the phenomenon in which the casing 11 damages the active material application portion 21, thereby improving the reliability of use of the battery 100, and the installation steps are simple, which is advantageous for improving production efficiency.

[0260] According to some embodiments of the present application, the present application further provides an electric device 1000 including the battery 100 described in the above solution, and the battery 100 is used to provide electric energy to the electric device 1000.

[0261] In the above technical solution, the battery 100 is installed in the electric device 1000, which can improve the reliability and stability of the operation of the battery 100, and thus improve the reliability and stability of the operation of the electric device 1000. It should be understood that if the electric device 1000 is a vehicle, the usage time of the battery 100 is improved, which is advantageous to extending the driving range of the vehicle.

[0262] The electrical device 1000 may be any of the equipment or systems described above that uses the battery 100 .

[0263] It should be noted that, unless there is a contradiction, the embodiments and features of the embodiments of the present application can be combined with each other.

[0264] The above is merely a preferred embodiment of the present application and does not limit the present application, and various modifications and variations of the present application may be made by those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the scope of the present application without departing from the spirit and principles of the present application are also included in the scope of the claims of the present application.

Claims

1. A battery cell (10), A casing (11) including a casing body (111) having a casing cover (112) and an opening (1110), wherein the casing cover (112) covers the opening (1110); a battery core assembly (2) including an active material application section (21) provided within the casing (11); a support (3) installed at one end of the active material coating portion (21) away from the opening (1110) and fitted to the battery core assembly (2); Here, the support (3) has a main body portion (36) and an extension portion (37) provided on the peripheral side of the main body portion (36), the projection of the main body portion (36) onto the plane of the casing cover (112) is located within the projection of the active material applied portion (21) onto the plane of the casing cover (112), and the projection of the extension portion (37) onto the plane of the casing cover (112) is located outside the projection of the active material applied portion (21) onto the plane of the casing cover (112). Battery cell (10).

2. 2. The battery cell (10) according to claim 1, wherein the extension portions (37) are located on opposite sides of the main body portion (36) along a predetermined direction, and the predetermined direction is parallel to the plane of the casing cover (112).

3. The battery cell (10) according to claim 2, wherein the extension portion (37) is an annular structure that surrounds the main body portion (36).

4. The battery cell (10) according to claim 1, wherein the edge of the surface of the extension portion (37) facing away from the casing cover (112) has a guide surface (35), and the guide surface (35) includes an arcuate surface and / or an inclined surface.

5. The battery cell (10) according to any one of claims 1 to 4, wherein the support (3) is engaged with or adhered to the battery core assembly (2).

6. A battery cell (10) as described in any one of claims 1 to 4, wherein a position limiting protrusion (38) is provided on the side of the extension portion (37) that is close to the casing cover (112), and the support (3) engages with the active material application portion (21) via the position limiting protrusion (38).

7. The surface of the position limiting convex portion (38) facing the active material application portion (21) is a first surface (381) to be bonded to the side wall of the active material coating portion (21), and / or a second surface (382) whose distance from the active material application portion (21) gradually increases along a direction in which the support (3) moves toward the opening (1110); The battery cell (10) of claim 6.

8. The battery cell (10) The device further includes an insulating member (4) that encases the active material application portion (21) and is connected to the extension portion (37). A battery cell (10) according to any one of claims 1 to 7.

9. The battery cell (10) according to claim 8, wherein the insulating member (4) is connected to a peripheral wall surface (370) of the extension portion (37).

10. 10. A battery cell (10) as described in claim 9, wherein the peripheral wall surface (370) has a first step surface (371) and a second step surface (372), the second step surface (372) is located on the side of the first step surface (371) closer to the casing cover (112), the second step surface (372) is closer to the active material application portion (21) than the first step surface (371), and the insulating member (4) is connected to the second step surface (372).

11. The battery cell (10) according to claim 10, wherein the first step surface (371) is farther from the active material coated portion (21) than the outer surface of the insulating member (4).

12. The battery cell (10) The battery further includes an insulating member (4) that encases the active material application portion (21) and is connected to a surface of the main body portion (36) that faces away from the casing cover (112). A battery cell (10) according to any one of claims 1 to 7.

13. The battery cell (10) according to any one of claims 1 to 12, wherein the casing (11) is provided with a pole (12), the battery core assembly (2) further includes a conductive portion (22), the conductive portion (22) is connected to a side of the active material application portion (21) that is adjacent to the main body portion (36), the main body portion (36) has a through hole (311), and the conductive portion (22) passes through the through hole (311) and is connected to the pole (12).

14. 14. The battery cell (10) of claim 13, wherein the support (3) is of a unitary structure, or the support (3) includes a first support (33) and a second support (34) that are separate structures and molded separately, and the through hole (311) is defined between the first support (33) and the second support (34).

15. 14. The battery cell (10) according to claim 13, wherein a housing groove (393) communicating with the through hole (311) is formed on the side of the main body (36) away from the active material coated portion (21), and the housing groove (393) is used to house at least a portion of the electrode post (12).

16. 14. The battery cell (10) according to claim 13, wherein a positioning portion (32) is provided on a side of the main body (36) that is away from the active material application portion (21), the positioning portion (32) being provided around the circumferential direction of the through hole (311) and extending in a direction approaching the electrode post (12).

17. 17. The battery cell (10) of claim 16, wherein the pole (12) is provided with a housing (121), at least a portion of the conductive portion (22) is housed within the housing (121), and at least a portion of the positioning portion (32) extends within the housing (121).

18. 14. The battery cell (10) according to claim 13, wherein a guide groove (312) communicating with the through hole (311) is formed on the side of the main body portion (36) facing the active material application portion (21), the guide groove (312) accommodates at least a portion of the conductive portion (22), and the cross-sectional area of ​​the guide groove (312) gradually increases along a direction approaching the active material application portion (21) of the main body portion (36).

19. 19. The battery cell (10) of claim 18, wherein the support (3) has at least one first liquid injection guide groove (392), the first liquid injection guide groove (392) being located on a side of the support (3) facing the active material application portion (21), and the at least one first liquid injection guide groove (392) being in communication with the guide groove (312).

20. 20. The battery cell (10) according to any one of claims 1 to 19, wherein the support (3) has a first liquid injection guide groove (392) located on a side of the support (3) facing the active material application portion (21), and / or the support (3) has a second liquid injection guide groove located on a side of the support (3) facing away from the active material application portion (21).

21. The battery cell (10) according to any one of claims 1 to 20, wherein the support (3) has a recess (391) on the side facing the battery core assembly (2) to avoid the outer edge of the battery core assembly (2) on the side facing the support (3).

22. The battery core assembly (2) further includes a conductive portion (22), the conductive portion (22) being connected to a side of the active material application portion (21) that is adjacent to the main body portion (36); The battery cell (10) according to any one of claims 1 to 21, wherein the casing (11) is provided with a pole (12), the pole (12) is provided with a housing portion (121), and at least a portion of the conductive portion (22) is housed in the housing portion (121) and connected to the pole (12).

23. A battery cell (10) as described in claim 22, wherein the accommodating portion (121) has 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 within the first accommodating groove (12110).

24. A battery cell (10) as described in claim 22, wherein the accommodating portion (121) has a second accommodating groove (12120), the surface of the pole (12) facing away from the active material application portion (21) is the pole outer end face (123), the groove opening of the second accommodating groove (12120) is formed in the pole outer end face (123), the second accommodating groove (12120) is connected to the inside of the casing (11) via a through hole (12130), and the conductive portion (22) is drilled in the through hole (12130) and at least a portion of it is accommodated in the second accommodating groove (12120).

25. A battery cell (10) as described in any one of claims 1 to 24, wherein the number of openings (1110) is two, each opening (1110) is provided with one casing cover (112), and the support (3) is installed at one end of the active material application portion (21) away from any of the openings (1110).

26. The battery cell (10) according to any one of claims 1 to 25, wherein at least one pole (12) is provided on a casing wall of the casing (11) on the side adjacent to the support (3).

27. A battery (100) comprising a battery cell (10) according to any one of claims 1 to 26.

28. 28. An electrical device (1000) comprising the battery (100) of claim 27.

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