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 specifically, to battery cells, batteries, and electrical devices.

Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important component of the sustainable development of the automotive industry due to their energy-saving and environmentally friendly advantages. In the case of electric vehicles, battery technology is an important factor related to their development. In related technologies, improving the reliability of battery cell usage is an issue that needs to be addressed urgently.

Summary of the Invention

[0003] [[ID=第十九]]In view of the above problems, this application provides a battery cell, a battery, and an electrical device, and the support of the battery cell can improve the reliability of battery cell usage.

[0004] In a first aspect, this application provides a battery cell 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 coating portion provided in the casing, and a support installed at one end away from the opening of the active material coating portion and fitted to the battery core assembly. Among them, the support has a main body portion and an extending portion provided on the peripheral side of the main body portion, the projection of the main body portion on the plane of the casing cover is located within the projection of the active material coating portion on the plane of the casing cover, and the projection of the extending portion on the plane of the casing cover is located outside the projection of the active material coating portion on the plane of the casing cover.

[0005] In the technical solution of the embodiment of the present application, the support is installed at one end away from the opening of the active material coating area, the projection of the main body onto the plane of the casing cover is placed within the projection of the active material coating area onto the plane of the casing cover, and then attached together to the casing. In the process of attaching the battery core assembly with the support to the casing, the support preferentially contacts the casing body, preventing to some extent the end of the casing body close to the opening from directly contacting the active material coating area, thereby minimizing the occurrence of the phenomenon of the casing damaging the active material coating area. Furthermore, by placing the projection of the extending portion of the casing cover onto the plane outside the projection of the active material coating area onto the plane of the casing cover, the active material coating area is protected during the process of attaching to the casing, the probability of the active material coating area contacting the casing is reduced, and the occurrence of the phenomenon of the casing damaging the active material coating area can be further reduced. Furthermore, by installing the support, the occurrence of the casing damaging the active material coating area is reduced, thereby decreasing the possibility of active material detachment. This also helps to some extent prevent internal short circuits caused by the overlapping of detached active material with polarity-opposite-polarity electrodes, and helps to some extent prevent chemical reactions between the detached active material and the casing, which could lead to corrosion and penetration of the casing. This improves the reliability of the battery cell during use.

[0006] In some embodiments, the extended portion is located on both opposing sides of the main body along a predetermined direction, with the predetermined direction being parallel to the plane of the casing cover, thereby preventing the opposing edges of the active material coated portion from contacting the casing and avoiding the casing damaging the opposing edges of the active material coated portion.

[0007] In some embodiments, the extension is an annular structure surrounding the main body. The support protects the outer edge of one end of the active material coated area and prevents the outer edge of the active material coated area facing the support from contacting the casing, thereby avoiding the phenomenon of the casing damaging the active material coated area and further improving the reliability of the battery cell.

[0008] In some embodiments, the edge of the surface of the extended portion facing away from the casing cover has a guide surface, and the guide surface includes an arcuate surface and / or an inclined surface. The guide surface can act as a guide, thereby allowing the support to be smoothly installed into the casing body, improving assembly efficiency.

[0009] In some embodiments, the support is engaged with or bonded to the battery core assembly so that the support and the battery core assembly are connected to each other, preventing to some extent the support from falling off before being mounted to the casing, thereby improving the yield rate of the battery cells. Furthermore, since the support and the battery core assembly can be mounted to the casing together, it is possible to protect the battery core assembly and ensure that the battery core assembly is mounted to the casing smoothly and securely, as well as providing insulation.

[0010] In some embodiments, a position-restricting projection is provided on the side of the extended portion adjacent to the casing cover, and the support is engaged with the active material coated portion via the position-restricting projection. By installing it in this manner, the position-restricting projection restrains one end of the active material coated portion, reducing the probability of the outer layer of the active material coated portion becoming loose, further protecting one end of the active material coated portion, mitigating the problem of one end of the active material coated portion contacting the casing, thereby reducing the occurrence of the phenomenon of the casing damaging the active material coated portion. The support is engaged with the active material coated portion via the position-restricting projection, preventing 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 coating portion includes a first surface that adheres to the side wall of the active material coating portion, and / or a second surface whose distance from the active material coating portion gradually increases along the direction in which the support faces the opening. The first and second surfaces can restrain the battery core assembly, thereby reducing the probability of the outer layer of the battery core assembly becoming loose, further protecting the side wall of the battery core assembly and mitigating the problem of one end of the battery core assembly contacting the casing, while the second surface can act as a guide, facilitating assembly and improving the assembly efficiency of the battery core assembly and support.

[0012] In some embodiments, the battery cell further includes an insulating member that encloses the active material coated portion and is connected to the extended portion. The insulating member is located between the active material coated portion and the casing, performs an insulating role, protects the battery core assembly, prevents overlapping of the battery core assembly and the battery cell casing, effectively reduces corrosion due to exposure of the battery core assembly, and facilitates the fixing of the insulating member by connecting it to the extended portion.

[0013] In some embodiments, the insulating member is connected to the peripheral wall surface of the extended portion, improving the reliability of the connection between the insulating member and the peripheral wall of the support, and reducing the risk of the insulating member falling off.

[0014] In some embodiments, the peripheral wall surface has a first stepped surface and a second stepped surface, the second stepped surface being located on the side of the first stepped surface closer to the casing cover, the second stepped surface being closer to the active material coated area than the first stepped surface, and the insulating member being connected to the second stepped surface. In the above technical proposal, by installing the peripheral wall surface to include the first stepped surface and the second stepped surface, mounting space can be provided for the insulating member, and by connecting the insulating member to the second stepped surface, the risk of the connection structure between the insulating member and the second stepped 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 positioned further away from the active material coating than the outer surface of the insulating member. The first stepped surface protects the edges of the insulating member and the active material coating, reducing the occurrence of friction between the edges of the insulating member and the active material coating and the inner wall of the casing. Furthermore, it 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 becoming detached, 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 encloses the active material coating and is connected to the surface of the main body away from the casing cover. On the one hand, in the process of installing the battery core assembly with support into the casing, the casing does not rub against the edges of the insulating member, nor the connection point between the insulating member and the main body, and the connection point between the two is not easily pulled apart during the installation process into the casing, thereby reducing the movement and slippage of the insulating member during the installation of the battery core assembly into the casing, improving the reliability of the connection between the insulating member and the support, reducing the risk of the insulating member falling off, and consequently reducing the risk of corrosion of the casing due to exposure of the battery core assembly, the risk of failure of the battery core assembly itself, and the risk of leakage, further improving the reliability and stability of the battery cell. Also, by connecting at least a portion of the insulating member to the wall surface of the main body away from the battery core assembly, the dimensions of the insulating member may be designed to be longer, allowing it to be applied to battery core assemblies of different dimensions, resulting in higher compatibility and manufacturability. On the other hand, after the support and battery core assembly are installed in place within the casing, the insulating member is pressed between the wall surface facing the opening of the casing and the main body. This further reduces the risk of the insulating member falling off, reduces the risk of battery core assembly failure due to exposure, and at the same time reduces the risk of casing corrosion, thereby improving the reliability and stability of the battery cell.

[0017] In some embodiments, pole columns are provided in the casing. , electricThe battery core assembly further includes a conductive part, which is connected to the side of the main body of the active material coating area that is close to the main body. The main body has a through-hole, and the conductive part is connected to the electrode post through the through-hole. In the above technical proposal, on the one hand, by providing a through-hole in the main body, the support can play a role in converging and housing the conductive part, making it easier to connect the conductive part to 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 structure of the original plastic component in the battery cell can be eliminated, and insulation between the entire active material coating area and the casing can be achieved by fitting the support and the insulating component, effectively reducing manufacturing and production costs.

[0018] In some embodiments, the support is a single-piece structure, or the support is a separate structure and includes a first support and a second support that are molded separately, with a through-hole defined between the first and second supports. A single-piece support is easy to manufacture and has relatively good reliability, and it facilitates assembly of the support with the casing assembly, improving assembly efficiency and mating stability. When assembling the support and the battery core assembly, the through-hole is defined by the mating of the first and second supports, and it is not necessary to pass the conductive part through the through-hole from one end to the other. Instead, the first and second supports can be combined at the position of the conductive part to sandwich the conductive part, and the through-hole surrounds the conductive part, thus facilitating assembly of the support and the battery core assembly and improving assembly efficiency.

[0019] In some embodiments, a accommodating groove communicating with a through-hole is provided on the side of the main body away from the active material coating area, and the accommodating groove is used to accommodate at least a portion of the electrode post. In the above technical proposal, on the one hand, by accommodating at least a portion of the electrode post with the accommodating groove, the overall structure of the battery cell becomes more compact and reliable, which is advantageous for improving the overall energy density of the battery. On the other hand, by providing the accommodating groove, the electrode post and the casing can be partially insulated by the support, further improving the stability and reliability of the battery cell.

[0020] In some embodiments, a positioning section is provided on the side of the main body away from the active material coating section. The positioning section is circumferentially positioned around the through-hole and extends in a direction approaching the electrode column. The positioning section can restrain, converge, and support the conductive section, facilitating connection between the conductive section and the electrode column, thereby improving the assembly efficiency and quality of the battery cell.

[0021] In some embodiments, the pole column is provided with a housing section, at least a portion of the conductive portion is housed within the housing section, and at least a portion of the positioning section extends within the housing section and is used to guide the conductive portion to be housed within the housing section. In the above technical proposal, on the one hand, by installing the pole column as a hollow structure and fitting the positioning section into the hollow structure, the conductive portion can be guided to connect to the pole column, improving the reliability of the connection and ensuring assembly efficiency and quality. On the other hand, the conductive portion can be housed within the housing section, improving the assembly efficiency of the conductive portion, saving the space occupied by the conductive portion, and making full use of the space in the battery cell, the fitting between the support and the pole column and between the support and the conductive portion becomes tighter and more reliable, the structure of the battery cell becomes more compact, and it is advantageous to improve the energy density of the battery cell.

[0022] In some embodiments, a guide groove communicating with a through-hole is formed on the side of the main body facing the active material coating area. The guide groove accommodates at least a portion of the conductive part, and the cross-sectional area of ​​the guide groove gradually increases along the direction approaching the active material coating area of ​​the main body. The guide groove not only accommodates the conductive part but also retracts it, preventing it from being crushed, reducing the probability of the conductive part becoming flimsy or folded, and thus reducing redundancy.

[0023] In some embodiments, the support has at least one first liquid injection guide groove, the first liquid injection guide groove is located on the side of the support facing the active material coating area, and at least one of the first liquid injection guide grooves communicates with a guide groove. When the liquid is injected, the electrolyte flows along the first liquid injection guide groove. Te Ga Because it can flow towards the id groove, the electrolyte can flow to a predetermined position, increasing the contact area between the electrolyte and the active material coating area. By installing the first liquid injection guide groove, the contact area between the electrolyte and the active material coating area increases, and the problem of poor penetration of the active material coating area can be reduced.

[0024] In some embodiments, the support has a first liquid injection guide groove, the first liquid injection guide groove located on the side of the support facing the active material coated area, and / or the support has a second liquid injection guide groove, the second liquid injection guide groove located on the side of the support facing away from the active material coated area. When the liquid is injected, the electrolyte flows along the first liquid injection guide groove and / or the second liquid injection guide groove, providing a penetration path for the electrolyte, increasing the fluidity of the electrolyte, improving the injection speed, and shortening the chemical standing time.

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

[0026] In some embodiments, the battery core assembly further includes a conductive part, the conductive part is connected to the side close to the main part of the active material coating part, the casing is provided with a pole column, the pole column is provided with a receiving part, at least a part of the conductive part is received in the receiving part and connected to the pole column. By accommodating at least a part of the conductive part in the receiving part, the occupied space of the battery cell itself can be reduced. Therefore, a battery of the same volume can accommodate more battery cells, the volume energy density of the battery can be improved, and also, since it occupies the space in the pole column, by accommodating at least a part of the conductive part in the receiving part, the redundancy of the conductive part in the casing can be reduced at least to some extent, the probability of short circuit between the conductive part and the active material coating part can be lowered, the probability of short circuit of the battery cell can be lowered, and the reliability and stability of the operation of the battery cell and the battery can be improved.

[0027] In some embodiments, the receiving part has a first receiving groove, the surface of the pole column facing the active material coating part is the inner end face of the pole column, the groove opening of the first receiving groove is formed on the inner end face of the pole column, and at least a part of the conductive part is received in the first receiving groove. In the above technical solution, on the one hand, by开设 the first receiving groove in the pole column, the weight of the pole column can be reduced to some extent, thereby improving the weight energy density of the battery cell and the battery. On the other hand, since the groove opening of the first receiving groove is formed on the inner end face of the pole column and the inner end face of the pole column is the surface on the side close to the active material coating part of the pole column, the first receiving groove can be opened towards the direction of the active material coating part, and further, the conductive part can easily extend in the first receiving groove, improving the assembly efficiency. Also, the first receiving groove in such a form is easy to process and the manufacturing efficiency is improved.

[0028] In some embodiments, the housing has a second housing groove, the surface of the pole column away from the active material coated portion is the outer end face of the pole column, the groove opening of the second housing groove is formed on the outer end face of the pole column, the second housing groove communicates with the inside of the casing through a through hole, the conductive portion is drilled in the through hole and at least partially housed in the second housing groove. In the above proposed technology, on the one hand, by installing a second housing groove on the pole column, the weight of the pole column can be reduced to some extent, thereby improving the gravimetric energy density of the battery cell and the battery. On the other hand, since the opening of the second housing groove is formed on the outer end surface of the pole column, and the outer end surface of the pole column is the surface away from the active material coated portion of the pole column, the second housing groove can be opened in the direction away from the active material coated portion. In this way, when at least a part of the conductive portion is housed in the second housing groove, the housing and arrangement of the conductive portion can be easily realized through the opening of the second housing groove, and electrical connection operations between the conductive portion and the pole column can be easily realized through the opening of the second housing groove, 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 a support is installed at one end away from any opening in the active material coating area. In the above technical proposal, two openings are provided in the casing body, and a support is installed at one end away from any opening in the battery core assembly. The battery core assembly, equipped with two supports and an insulating member, can be installed into the casing body from any opening, and an appropriate installation direction can be selected according to the needs. After the battery core assembly is installed in a predetermined position within the casing body, a portion of the insulating member may be pressed between the wall facing one opening in the casing body and the corresponding support, and the other portion of the insulating member may be pressed between the wall facing the other opening in the casing body and the corresponding support, further reducing the risk of the insulating member falling off, reducing the risk of battery core assembly failure due to exposure, and at the same time reducing the risk of casing corrosion, thereby improving the reliability and stability of the battery cell.

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

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

[0032] In the above technical solution, since the above battery cell is installed in the battery, the support can restrain the active material coating part. In addition, the extending part protects the active material coating part, reduces the probability that the active material coating part contacts the casing, and reduces the occurrence of the phenomenon that the casing damages the active material coating part as much as possible, improving the use reliability of the battery. Moreover, the installation steps are simple, which is beneficial to improving the production efficiency.

[0033] In a third aspect, the present application provides an electrical device comprising the battery in the above embodiment. In the above technical solution, since the above battery is installed in the electrical device and the reliability and stability of the operation of the battery can be improved, the reliability and stability of the operation of the battery device can be improved.

[0034] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application and be able to implement it according to the content of the specification, and in order to more clearly and easily understand the above and other objects, features and advantages of the present application, the specific embodiments of the present application are specifically listed below.

Brief Description of the Drawings

[0035] To further clarify the technical concept of the embodiments of this application, the drawings used in the embodiments are briefly introduced below. However, it should be understood that these drawings only show some embodiments of this application and should therefore not be considered limiting in scope. Those skilled in the art can obtain other relevant drawings based on these drawings without any creative work. [Figure 1] This is a schematic diagram of the structure of a vehicle provided by some embodiments of the present application. [Figure 2] This is an exploded view of the structure of a battery provided by some embodiments of the present application. [Figure 3] A battery provided by several embodiments of the present invention. [Figure 4] This is an exploded view of the structure of a battery cell according to several embodiments of the present invention. [Figure 5] This is a cross-sectional view of the structure of a battery cell according to several embodiments of the present application. [Figure 6] Figure 5 is a magnified view of location A in the battery cell. [Figure 7] This is a front view of a battery cell according to several embodiments of the present invention. [Figure 8] This is a front view of a battery cell according to several other embodiments of the present invention. [Figure 9] This is a cross-sectional view of the local structure of a battery cell according to several embodiments of the present application. [Figure 10] This is a cross-sectional view of the local structure of a battery cell according to several other embodiments of the present application. [Figure 11] This is a cross-sectional view of the local structure of a battery cell according to several further embodiments of the present application. [Figure 12] This is a cross-sectional view of the local structure of a battery cell according to several further embodiments of the present application. [Figure 13] This is a structural cross-sectional view of a battery cell after the battery core assembly, support, and insulating member have been assembled according to several embodiments of the present application. [Figure 14] Figure 13 is a magnified view of location B in the battery cell. [Figure 15]This is a structural cross-sectional view of a battery cell after the battery core assembly, support, and insulating member have been assembled according to some other embodiments of the present application. [Figure 16] This is a schematic diagram of the structure of a battery cell support according to several embodiments of the present invention. [Figure 17] This is a schematic diagram of the structure of a battery cell support according to some other embodiments of the present invention. [Figure 18] This is a schematic diagram of a local cross-section of a battery cell provided by some embodiments of the present application. [Figure 19] This is a cross-sectional view of the structure of a battery cell support according to several embodiments of the present application. [Figure 20] This is a top view of a battery cell support according to several embodiments of the present invention. [Figure 21] This is a top view of a battery cell support according to some other embodiments of the present application. [Figure 22] This is a schematic diagram of a local cross-section of a battery cell provided by some embodiments of the present application. [Figure 23] This is a schematic diagram of a local cross-section of a battery cell provided by some embodiments of the present application. [Figure 24] This is a schematic diagram of a local cross-section of a battery cell provided by some embodiments of the present application. [Figure 25] This is a schematic diagram of a local cross-section of a battery cell provided by some embodiments of the present application. [Figure 26] This is a schematic diagram of a local cross-section of a battery cell provided by some embodiments of the present application. [Figure 27] This is a schematic diagram of a local cross-section of a battery cell provided by some embodiments of the present application. [Figure 28] Figure 27 is an exploded view of the structure of a battery cell. [Figure 29] Figure 28 is an exploded view of the structure of the first cover plate. [Figure 30] This is a schematic diagram of a local cross-section of a battery cell provided by some embodiments of the present application. [Figure 31] Figure 30 is an exploded view of the structure of a battery cell. [Figure 32]This is an assembly diagram of a battery cell according to several embodiments of the present invention. [Figure 33] This is an assembly diagram of a battery cell according to several other embodiments of the present invention. [Explanation of Symbols]

[0036] Electrical device 1000, battery 100, controller 200, motor 300, First direction Z, second direction X, third direction Y, axis R of the pole column, 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 column 12, housing section 121, first housing groove 12110, first end wall 12111, first recessed groove 12112, first side wall 12113, second housing groove 12120, second end wall 12121, second recessed 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 column inner end surface 122, pole column outer end surface 123, first recessed groove 126, spacing section 127, First cover plate 13, first conductive member 131, second groove 1311, second conductive member 132, stress relief groove 133, 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 part 32, first support 33, second support 34, guide surface 35, main body part 36, extended part 37, peripheral wall surface 370, first stepped surface 371, second stepped surface 372, position limiting protrusion 38, first surface 381, second surface 382, ​​relief part 391, first liquid injection guide groove 392, housing groove 393, Insulating member 4, connection mark 401, Groove cover 7. [Modes for carrying out the invention]

[0037] The following describes in detail embodiments of the present invention in accordance with the drawings. The following embodiments are merely for the purpose of more clearly illustrating the present invention and are therefore just examples, and do not limit the scope of the claims of this invention.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art. Terms used herein are solely for the purpose of describing specific embodiments and are not intended to limit this application. The terms “includes” and “compose,” and any variations thereof, in the description of this application, claims, and drawings are intended to cover non-exclusive inclusion.

[0039] In the description of the embodiments of this application, technical terms such as “first,” “second,” etc., are merely used to distinguish different subjects, and should not be understood as indicating or implying relative importance, or implicitly indicating the quantity, specific order, and priority of the technical features being referred to. In the description of the embodiments of this application, “multiple” means two or more unless otherwise clearly and specifically limited.

[0040] As used herein, “Examples” means that the specific features, structures, or characteristics described in conjunction with the Examples are included in at least one Example of the Application. Each occurrence of the word in the Specification does not necessarily refer to the same Example, nor do they represent mutually exclusive, independent, or substitutable Examples. Those skilled in the art will understand, both explicitly and implicitly, that the Examples described herein may be combined with other Examples.

[0041] In the description of the embodiments of this application, the term "and / or" simply describes a related relationship that describes related objects, indicating that three types of relationships are possible. For example, A and / or B can represent three cases: A existing only, A and B existing simultaneously, and B existing only. In this specification, the letter " / " generally indicates that the related objects before and after it are in an "or" relationship.

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

[0043] In this application, "multiple" refers to two or more (including two).

[0044] In the description of the embodiments of this application, unless otherwise specifically specified and limited, technical terms such as “attachment,” “connection,” “bonding,” and “fixing” should be understood in a broad sense, for example, they may be fixed connections, removable connections, or integrated connections, mechanical connections, electrical connections, direct connections, indirect connections via an intermediate medium, or internal communication between two elements or an interaction relationship between two elements. Those skilled in the art may understand the specific meaning of the above terms in the embodiments of this application depending on the specific circumstances.

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

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

[0047] Exemplary, a battery cell may typically include a casing for housing an electrode assembly and an electrolyte, the electrode assembly and the electrolyte, the casing being provided with at least one positive electrode column and at least one negative electrode column. The electrode assembly is formed by laminating or winding positive electrode pieces, negative electrode pieces and a separator film.

[0048] In this configuration, 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. Positive electrode current collectors not coated with the positive electrode active material layer protrude from the positive electrode current collectors coated with the positive electrode active material layer, and these uncoated positive electrode current collectors are used as positive electrode tab sheets. Multiple positive electrode tab sheets are laminated together and electrically connected to the positive electrode column. 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. Negative electrode current collectors not coated with the negative electrode active material layer protrude from the negative electrode current collectors coated with the negative electrode active material layer. Positive electrode current collectors not coated with the negative electrode active material layer are used as negative electrode tab sheets. Multiple negative electrode tab sheets are laminated together and electrically connected to the negative electrode column. The material of the separator film is not particularly limited and may be, for example, polypropylene or polyethylene.

[0049] At the same time, a battery cell functions primarily by relying on the movement of metal ions between the positive and negative electrode pieces. Taking a lithium-ion battery as an example, the material of the positive electrode current collector may be aluminum, the material of the positive electrode active material layer may be lithium cobalt oxide, lithium iron phosphate, lithium ternary, or lithium manganese oxide, the material of the negative electrode current collector may be copper, and the material of the negative electrode active material layer may be carbon or silicon. During the charging and discharging process, Li+ ions repeatedly insert and remove between the two electrodes. During charging, Li+ ions are removed from the positive electrode and inserted into the negative electrode via the electrolyte, making the negative electrode lithium-rich, and the reverse occurs during discharging.

[0050] Judging from the current market developments, the applications of power batteries are becoming increasingly broad. Power batteries are not only used in energy storage systems such as hydroelectric, thermal, wind, and solar power generation, but also in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in various fields such as military equipment and aerospace. As the application areas of power batteries continue to expand, the market demand for them will also continue to increase.

[0051] In battery cells of related technologies, during manufacturing, an active material layer is applied to the current collector before cutting to obtain electrode pieces consisting of a current collector with the active material layer applied (referred to as the active material coated portion) and a current collector without the active material layer applied (referred to as a tab sheet). Subsequently, the positive electrode piece, negative electrode piece, and separator film are sequentially laminated or wound to obtain an electrode assembly. In the electrode assembly, multiple tab sheets are laminated and installed to form tab sections, the tab sections themselves form conductive sections, or the tab sections are connected to an adapter sheet to form conductive sections, and the active material coated portion and the conductive sections form the battery core assembly. Electrode columns are installed on the casing cover of the battery cell, and when assembling the battery cell, the conductive section of the battery core assembly and the electrode columns on the casing cover are usually welded together, and then both are attached to the casing through the opening in the casing body.

[0052] However, the inventors have 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 (particularly the edges of the battery core assembly) easily interfere with or rub against the casing, which can damage the insulating member and the pole pieces of the battery core assembly, potentially causing the active material to fall out and leading to an internal short circuit due to the overlap of the active material with pole pieces of opposite polarity. Furthermore, the insulating member is prone to wrinkling during the friction process with the casing, causing 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 the battery cell.

[0053] To reduce the occurrence of the phenomenon in which the casing damages the battery core assembly, the present invention provides a support that is positioned at one end away from the opening of the active material coating area, and the projection of the main body of the casing cover onto the plane of the casing cover is positioned within the projection of the active material coating area onto the plane of the casing cover, and then attaches them together to the casing. In the process of attaching the battery core assembly with the support to the casing, the support preferentially contacts the casing body, preventing to some extent the end of the casing body close to the opening from directly contacting the active material coating area, thereby reducing the occurrence of the phenomenon in which the casing damages the active material coating area as much as possible. Furthermore, by positioning the projection of the extending portion of the casing cover onto the plane outside the projection of the active material coating area onto the plane of the casing cover, the active material coating area is protected during the process of attaching to the casing, the probability of the active material coating area contacting the casing is reduced, and the occurrence of the phenomenon in which the casing damages the active material coating area can be further reduced. By installing the support, the occurrence of the casing damaging the active material coating is reduced, thereby decreasing the possibility of active material detachment. This also helps to some extent prevent internal short circuits caused by the overlapping of detached active material with polarity-opposite-polarity electrodes, and to some extent prevents chemical reactions between the detached active material and the casing, which could lead to corrosion and penetration of the casing. This improves the reliability of the battery cell.

[0054] The battery cells disclosed in the embodiments of this application may be used in electrical devices that use batteries as a power source or in various energy storage systems that use batteries as energy storage elements. Electrical devices include, but are not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, electric scooters, electric vehicles, ships, and aerospace vehicles. Electric toys may include stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys, while aerospace vehicles include airplanes, rockets, space shuttles, and spacecraft.

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

[0056] Referring to Figure 1, which is a schematic diagram of the structure of an electrical device 1000, a vehicle provided in some embodiments of the present application. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range extender vehicle. The vehicle is equipped with a battery 100, which may be installed at the bottom, front, or rear of the vehicle. The battery 100 is used to supply power to the vehicle, and for example, the battery 100 can function as the vehicle's operating power source. The vehicle may further include a controller 200 and a motor 300, the controller 200 controlling the battery 100 to supply power to the motor 300, and is used, for example, to meet the demands for operating power during vehicle starting, navigation, and driving. In some embodiments of the present application, the battery 100 can be used not only as the vehicle's operating power source but also as the vehicle's drive power source, providing driving force to the vehicle in place of or in part of fuel or natural gas.

[0057] Referring to Figure 2, which is an exploded view of the structure of a battery 100 provided by several 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 housing space for the battery cells 10, and the case 20 can employ various structures. In some embodiments, the case 20 may include a first case 201 and a second case 202, the first case 201 and the second case 202 covering each other, and the first case 201 and the second case 202 jointly define 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 (as shown in Figure 2, for example), with the open side of the first case 201 covering the open side of the second case 202. Naturally, the case 20 formed by the first case 201 and the second case 202 may have various shapes, such as cylindrical or rectangular parallelepiped.

[0058] In the battery 100, multiple battery cells 10 can be connected in series, in parallel, or in series-parallel, where series-parallel connection refers to the connection of multiple battery cells 10 in both series and parallel. Multiple battery cells 10 can be directly connected in series, in parallel, or in series-parallel, and the entire assembly of multiple battery cells 10 is housed in a case 20. Alternatively, the battery 100 may be in a form in which multiple battery cells 10 are first connected in series, in parallel, or in series-parallel to form a battery module, and the multiple battery modules are further connected in series, in parallel, or in series-parallel to form a single unit 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 realizing electrical connections between multiple battery cells 10.

[0059] Referring to Figure 3, which is a schematic diagram of a battery cell 10 provided in several embodiments of the present application, in which the battery cell 10 is a rectangular parallelepiped, and the height direction of the battery cell 10 is the first direction Z, the length direction of the battery cell 10 is the second direction X, and the thickness direction of the battery cell 10 is the third direction Y. The first direction Z, the second direction X, and the third direction Y are perpendicular to each other in pairs. Of course, in other embodiments of the present application, the battery cell 10 may be cylindrical, flattened, or have other shapes, and is not limited to this embodiment.

[0060] Referring to Figures 4 and 5, Figure 4 is an exploded view of the structure of a battery cell according to several embodiments of the present application. Figure 5 is a cross-sectional view of the structure of a battery cell according to several embodiments of the present application. In the embodiments 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 this 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 this application, the casing 11 will be described as prismatic in all cases. At the same time, the casing 11 is provided with poles 12, which are electrically connected to the battery core assembly 2 to ensure the normal progress of the charging and discharging operations of the battery cell 10. Generally, there are at least two poles, specifically consisting of at least one positive pole and at least one negative pole. For example, if there are two poles, one is a positive pole and the other is a negative pole, and they are electrically connected to the positive and negative output positions of the battery core assembly 2, respectively. Furthermore, if there are four electrode poles, two may be positive electrode poles and the remaining two may be negative electrode poles, with both positive electrode poles electrically connected to the positive electrode output position of the battery core assembly 2, and both negative electrode poles electrically connected to the negative electrode output position of the battery core assembly 2. The casing 11 may also be provided with a pressure release mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold, and the pressure release mechanism can release pressure when the internal pressure or temperature of the battery cell 10 is too high, thereby preventing the propagation of thermal runaway to other battery cells 10.

[0062] Furthermore, in the embodiments of the present application, the casing 11 specifically includes a casing body 111 and a casing cover 112.

[0063] The casing body 111 is a semi-sealed structure with an opening 1110 at one end, or an annular structure with openings 1110 at both ends. At the same time, the casing body 111 may be of various shapes and dimensions, such as a rectangular parallelepiped, cylindrical, or hexagonal prism, and the shape of the casing body 111 can be determined according to the specific shape and dimensions of the battery core assembly 2. The material of the casing body 111 may be various materials such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic, and is not particularly limited in the embodiments of this 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 opening 1110 of the casing body 111, isolating the internal environment of the battery cell 10 from the external environment. The number of casing covers 112 matches the number of openings 1110. If there is one opening 1110, there is one casing cover 112, which covers and seals the opening 1110. If there are two openings 1110, there are two casing covers 112, which cover and seal each of the two openings 1110. The casing cover 112 and the casing body 111 can form a common connection surface before other components are attached to the casing. If it is necessary to seal the inside of the casing body 111, 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 and fitted into the casing body 111. Selectively, the casing cover 112 may be made of a material having a certain hardness and strength (such as an aluminum alloy), so that the casing cover 112 is less likely to deform when subjected to pressure and impact, the battery cell 10 can have higher structural strength, and safety performance is also improved. Functional members such as pole columns 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, and plastic, and is not particularly limited in the embodiments of this application.

[0065] The casing 11 is provided with pole columns 12, and there are multiple pole columns 12. These pole columns 12 may all be installed on the casing body 111, all on the casing cover 112, or some may be installed on the casing body 111 and others on the casing bar 112. In the following embodiments of this application, the casing body 111 is rectangular, the casing body 111 has one opening 1110, and there are two pole columns 12, one positive pole column and one negative pole column, and both pole columns 12 are installed on a wall facing the opening 1110 of the casing body 111. Naturally, in other embodiments of this application, the shape of the casing body 111, the number of openings 1110 and casing covers 112, the number of pole columns 12, and the position of the pole columns 12 can all be adjusted according to the needs, and are not limited to the embodiments of this 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 the active material is coated, 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 have the active material coated on it and may be electrically connected to the active material coated portion 21 via the conductive portion 22 to enable the charging and discharging of the battery cell 10. The conductive portion 22 may be formed by the tab sheet itself or may be formed after the tab sheet is connected to the adapter sheet.

[0067] The active material coating section 21 is divided into a positive electrode active material coating section and a negative electrode active material coating section. The positive electrode active material coating section includes a portion of the positive electrode current collector to which the positive electrode active material layer is coated, and the negative electrode active material coating section includes a portion of the negative electrode current collector to which the negative electrode active material layer is coated. The conductive section 22 is divided into a positive electrode conductive section and a negative electrode conductive section. The positive electrode conductive section electrically connects the positive electrode active material coating section and the positive electrode column, and the negative electrode conductive section electrically connects the negative electrode active material coating section and the negative electrode column.

[0068] In the embodiment of the present application, referring again to Figures 4 and 5, the support 3 is installed at one end away from the opening 1110 of the active material coating section 21, and the support 3 is fitted into 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 into the casing 11, the support 3 first enters the casing body 111 through the opening 1110 of the casing body 111, then the active material coating section 21 enters the casing body 111, and after the battery core assembly 2 is installed in a predetermined position inside the casing body 111, the support 3 is located at the wall of the casing body 111 facing its opening 1110 and at one end away from the opening 1110 of the active material coating section 21. 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 that are positioned opposite each other, and in the process of installing the battery core assembly 2 with the support 3 into the casing 11, first the support 3 enters the casing body 111 through the first opening of the casing body 111 and moves toward the second opening, then the active material coating portion 21 enters the casing body 111, and after the battery core assembly 2 is installed in a predetermined position inside the casing body 111, the support 3 is positioned toward the second opening.

[0069] The insulating member 4 encloses the active material coated portion 21, improving the insulation reliability between the active material coated portion 21 and the casing 11, reducing or preventing corrosion of the casing 11 caused by contact between the active material coated portion 21 and the casing 11, mitigating the problem of electrolyte leakage due to corrosion of the casing 11, and improving the reliability of the battery cell 10.

[0070] Referring again to Figures 4 and 5, the support 3 has a main body 36 and an extension 37, the extension 37 being provided on the peripheral side of the main body 36, the projection of the main body 36 onto the plane of the casing cover 112 is located within the projection of the active material coated portion 21 onto the plane of the casing cover 112, and the projection of the extension 37 onto the plane of the casing cover 112 is located outside the projection of the active material coated 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 extends at least partially beyond the projection of the active material coated portion 21 onto the plane of the casing cover 112.

[0071] Here, the support 3 may be a plate-like structure, and the support 3 may be installed on the side of the active material coated section 21 where the conductive section 22 is located, and the support 3 may be provided with a relief structure to avoid the conductive section 22 (for example, a relief groove or the through-hole 311 described below), and the support 3 may be installed on the side of the active material coated section 21 where the conductive section 22 is not located, and in this way, the support 3 does not need to be provided with a relief structure to avoid the conductive section 22.

[0072] When support 3 is installed on the side of the active material coated section 21 where the conductive section 22 is located, support 3 may be installed facing the pole column 12, that is, support 3 and pole column 12 may be located on the same side of the active material coated section 21, and support 3 may be installed between pole column 12 and the active material coated section 21. When support 3 is installed on the side of the active material coated section 21 where the conductive section 22 is not located, support 3 is not installed facing the pole column 12. For example, support 3 and pole column 12 may be located on adjacent sides of the active material coated section 21, or for example, support 3 and pole column 12 may be located on opposing sides of the active material coated section 21.

[0073] It should be explained that in the embodiments of the present invention, the support 3 in the embodiments of the present invention 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 structure of the top cover, upper plastic member, lower plastic member, etc.), and an independent support 3 can be used 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 away from the opening 1110 of the active material coating section 21, the projection of the main body 36 onto the plane of the casing cover 112 is placed within the projection of the active material coating section 21 onto the plane of the casing cover 112, and then attached together to the casing, and in the process of installing the battery core assembly 2 with the support 3 into the casing 11, the support 3 preferentially contacts the casing body 111, and the end of the casing body 111 close to the opening 1110 is the active material coating section 21 By preventing direct contact to some extent, the phenomenon of the casing 11 damaging the active material coated portion 21 is reduced as much as possible. By positioning the projection of the extension portion 37 of the casing cover 112 onto the plane outside the projection of the active material coated portion 21 onto the plane of the casing cover 112, the active material coated portion 21 is protected during the process of mounting to the casing, the probability of the active material coated portion 21 coming into contact with the casing 11 is reduced, and the occurrence of the phenomenon of the casing 11 damaging the active material coated portion 21 can be further reduced. In addition, by installing the support 3, the occurrence of the casing 11 damaging the active material coated portion 21 is reduced, thereby reducing the possibility of the active material falling off, preventing internal short circuits caused by the overlap of the fallen active material and the opposite polarity pole piece to some extent, and preventing chemical reactions between the fallen active material and the casing 11, which would ultimately cause corrosion and penetration of the casing 11, thereby improving the reliability of the battery cell 10.

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

[0076] In the above-described technical proposal, by installing the extended portion 37 on both opposing sides along a predetermined direction of the main body portion 36, it is possible to prevent the opposing edges of the active material coating portion 21 from coming into contact with the casing 11, thereby preventing the casing 11 from damaging the opposing edges of the active material coating portion 21.

[0077] In some embodiments, the extended portion 37 is an annular structure surrounding the main portion 36. That is, the edges of the projection of the support 3 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 installing it in this manner, the support 3 protects the outer edge of one end of the active material coated portion 21, preventing the outer edge of the active material coated portion 21 facing the support 3 from contacting the casing 11, thereby avoiding the phenomenon of the casing 11 damaging the active material coated portion 21, and further improving the reliability of the battery cell 10.

[0078] Referring again to Figure 5, and further to Figure 6, which 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, the 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 a connection point between the side of the extending portion 37 facing away from the main portion 36 and the side facing away from the casing cover 112.

[0079] Exemplary, the guide surface 35 may include a bevel. Specifically, a chamfer may be provided on the edge of the support 3 facing away from the battery core assembly 2, where "chamfer" refers to machining the corner of the support 3 into a certain bevel by a process such as cutting in order to facilitate the installation of the support 3 into the casing 11. Exemplary, the guide surface 35 may include an arcuate surface. An arcuate surface can similarly serve as an automatic guide in the process of installing the support 3 into the casing 11. Exemplary, the guide surface 35 may include both an arcuate surface and a bevel. Of course, the guide surface 35 may be any other irregularly shaped surface, 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 act as a guide, thereby allowing the support 3 to be smoothly installed into the casing body 111, improving assembly efficiency.

[0081] According to some embodiments of the present application, the support 3 is engaged with or bonded 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 a mounting groove, and the end of the active material coating portion 21 away from the opening 1110 is fitted into the mounting groove, thereby achieving the purpose of engaging the end of the active material coating portion 21 away from the opening 1110 with the support 3, resulting in a simple connection structure and easy operation. Of course, the method of engaging the support 3 with 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 can be placed between the end of the active material coating portion 21 away from the opening 1110 and the support 3, and a connecting adhesive can also be placed between the side wall of the active material coating portion 21 and the support 3, thereby achieving the purpose of bonding the end of the active material coating portion 21 away from the opening 1110 with the support 3, and of course, the position where the connecting adhesive is placed is not limited to the above positions.

[0083] It should be explained 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. Connecting the support 3 to the battery core assembly 2 prevents the support 3 from falling off before it is mounted to the casing, thereby improving the yield rate of the battery cells 10. Mounting the support 3 and the battery core assembly 2 together to the casing protects the battery core assembly 2, ensuring that it is mounted smoothly and safely to the casing, and also provides insulation.

[0084] Referring to Figures 7 and 8, Figure 7 is a front view of a battery cell 10 according to several embodiments of the present application. Figure 8 is a front view of a battery cell 10 according to several other embodiments of the present application. One side of the support 3 has a position limiting protrusion. 38 A position limiting protrusion is provided. 38 It engages with the active material coating section 21.

[0085] For example, position limiting protrusion 38 The extension portion 37 may also be provided, and the position limiting protrusion 38 The extension portion 37 may be provided on the side of the extension portion 37 that is close to the casing cover 112, that is, the position limiting protrusion 38 It is formed by being installed so as to protrude from the casing cover 112 from the surface of the extended portion 37 that is close to the casing cover 112, and the position limiting protrusion 38 The extension portion 37 may be provided on the side that separates from the main portion 36, that is, the position limiting protrusion. 38 One end is connected to the side of the extension portion 37 that is separated from the main portion 36, and the position limiting protrusion 38 The other end extends in a direction approaching the casing cover 112 and extends beyond the end face of the main body 36 that is close to the casing cover 112.

[0086] For example, position limiting protrusion 38 The main body 36 may also be provided with a position limiting projection. 38This may be provided on the side of the main body 36 that is close to the casing cover 112, that is, the position limiting protrusion 38 It is formed by being installed so as to protrude from the surface of the main body 36 that is close to the casing cover 112 and onto the casing cover 112.

[0087] For ease of understanding, the active material coating section 21 may be defined as having a first end 201 and a second end 202 positioned opposite each other, with the position limiting projection 38 remaining outside the side wall adjacent to the first end 201 of the active material coating section 21. In the process of installing the battery core assembly 2 with the support 3 into the casing 11, the first end 201 of the active material coating section 21 with the support 3 first enters the casing 11, and as the assembly process progresses, the first end 201 of the active material coating section 21 gradually moves away from the opening 1110 within the casing 11, with the position limiting projection 38 positioned between the side wall of the active material coating section 21 and the casing 11. After the battery core assembly 2 and the support 3 are installed in their predetermined positions within the casing 11, the support 3 is positioned between the wall of the casing 11 opposite the opening 1110 and the first end 201 of the active material coating section 21.

[0088] By installing it in this manner, the position-restricting projection 38 restrains one end of the active material coated portion 21, reducing the probability of the outer layer of the active material coated portion 21 becoming loose, further protecting one end of the active material coated portion 21, mitigating the problem of one end of the active material coated portion 21 contacting the casing 11, thereby reducing the occurrence of the casing 11 damaging the active material coated portion 21. At the same time, the support 3 engages with the active material coated portion 21 via the position-restricting projection 38, preventing to some extent the support 3 from falling off before being attached to the casing, thereby improving the yield rate of the battery cell 10.

[0089] Referring again to Figure 7, the position-limiting projection 38 forms an annular projection, which extends along the circumferential direction of the battery core assembly 2.

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

[0091] Referring again to Figure 8, there may be multiple position-restricting protrusions 38, which are spaced apart in the circumferential direction of the battery core assembly 2, with a gap between any two adjacent position-restricting protrusions 38. This arrangement allows the position-restricting protrusions 38 to restrain and protect the battery core assembly 2, thereby reducing material usage and costs, as well as facilitating the assembly of the support 3 and the battery core assembly 2.

[0092] Naturally, the arrangement of the multiple position-restricting protrusions 38 is not limited to the above case, but can be specifically selected according to actual needs. Here, the position-restricting protrusions 38 are attached to the side wall of the battery core assembly 2, or there is a gap between the position-restricting protrusions 38 and the side wall of the battery core assembly 2. In other words, the position-restricting protrusions 38 may or may not contact the side wall of the battery core assembly 2. The position-restricting protrusions 38 stop the side wall of the battery core assembly 2, reduce the probability of the outer layer of the battery core assembly 2 becoming loose, protect the side wall of the battery core assembly 2, and mitigate the problem of one end of the battery core assembly 2 contacting the casing 11.

[0093] Referring to Figure 9, which is a cross-sectional view of the local structure of a battery cell 10 according to several embodiments of the present application, the surface of the position-limiting protrusion 38 facing the active material coating portion 21 may include a first surface 381, the first surface 381 which adheres to the side wall of the active material coating portion 21, the first surface 381 which restrains the battery core assembly 2, reduces the probability of the outer layer of the active material coating portion 21 becoming loose, protects the side wall of the active material coating portion 21, and can mitigate the problem of one end of the active material coating portion 21 contacting the casing 11.

[0094] Referring to Figure 10, which is a cross-sectional view of the local structure of a battery cell 10 according to some other embodiments of the present application, the surface of the position-limiting projection 38 facing the active material coating area 21 may include a second surface 382, ​​the distance between the second surface 382 and the active material coating area 21 gradually increases along the direction in which the support 3 faces the opening 1110, that is, the second surface 382 extends obliquely away from the base of the position-limiting projection 38 and the sidewall of the active material coating area 21, for example, the second surface 382 may be an inclined surface or an arcuate surface.

[0095] By installing it in this manner, the second surface 382 can stop the side wall of the active material coated section 21, reducing the probability of the outer layer of the active material coated section 21 becoming loose, and further protecting the side wall of the active material coated section 21. In addition, the second surface 382 can act as a guide, making assembly easier and improving the assembly efficiency of the battery core assembly 2 and support 3. 。

[0096] Referring to Figure 11, which is a cross-sectional view of the local structure of a battery cell 10 according to some further embodiments of the present application, the surface of the position-limiting projection 38 facing the active material coating area 21 may include a first surface 381 and a second surface 382, ​​the first surface 381 adhering to the side wall of the active material coating area 21, the distance between the second surface 382 and the active material coating area 21 gradually increasing along the direction in which the support 3 faces the opening 1110, and the first surface 381 located between the base of the position-limiting projection 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 set at an angle along the height direction of the support 3. By setting them in this manner, a good restraining role can be played on the active material coated portion 21, effectively reducing the probability of the outer layer of the active material coated portion 21 becoming fluffy, as well as facilitating assembly and improving the assembly efficiency of the battery core assembly 2 and the support 3.

[0098] Referring to Figure 12, which is a cross-sectional view of the local structure of a battery cell according to some further embodiments of the present application. On the side of support 3 facing battery core assembly 2, there is a relief portion 391 to relieve the outer edge of battery core assembly 2 on the side facing support 3, thereby reducing the risk of support 3 crushing battery core assembly 2.

[0099] Specifically, in an embodiment in which the support 3 has a position-limiting projection 38, when forming the support 3, a rounded corner structure may appear at the base of the position-limiting projection 38 on the side close to the center of the support 3. By installing a relief portion 391, the rounded corner structure between the position-limiting projection 38 and the main body 36 can be removed, preventing the rounded corner structure from crushing the outer edge of the battery core assembly 2. Here, the relief portion 391 may be a groove that opens toward the battery core assembly 2. For example, the groove may be an annular groove, or there may be multiple grooves, and the multiple grooves may be spaced apart, and the shape of the grooves may be selected according to the actual situation. Alternatively, for example, the relief portion 391 may be a relief slope or relief arc surface to avoid the battery core assembly 2. In other embodiments of the present application, the side of the support 3 toward the battery core assembly 2 can make full contact with the battery core assembly 2, that is, there is no relief structure on the side of the support 3 toward the battery core assembly 2.

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

[0101] With the battery core assembly 2 equipped with support 3 installed in a predetermined position within the casing 11, the insulating member 4 is positioned between the active material coated portion 21 and the casing 11, performing 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 phenomenon of corrosion due to exposure of the battery core assembly 2. By connecting the insulating member 4 to the extended portion 37, the fixing of the insulating member 4 becomes easier.

[0102] Referring again to Figures 13 and 14, the insulating member 4 is connected to the peripheral wall surface 370 of the extended portion 37. Here, "peripheral wall surface 370 of the extended portion 37" refers to the outer wall surface that extends along the height direction (up and down direction in the figure) of the extended portion 37. Exemplarily, 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 side wall surface being parallel to the height direction (up and down direction in the figure) of the support 3; if the support 3 is cylindrical, the peripheral wall surface 370 of the support 3 is a cylindrical surface. Of course, 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 arranged at intervals in the circumferential direction of the support 3.

[0104] More specifically, in an embodiment where 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 encloses 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 connection marks 401 are 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 proposed technology, 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 stepped surface 371 and a second stepped surface 372, the second stepped surface 372 is located on the side of the first stepped surface 371 that is closer to the casing cover 112, the second stepped surface 372 is closer to the active material coated portion 21 than the first stepped surface 371, and the insulating member 4 is connected to the second stepped surface 372.

[0107] In the above proposed technology, by installing the peripheral wall surface 370 to include the first stair surface 371 and the second stair surface 372, a mounting space can be provided for the insulating member 4. By connecting the insulating member 4 to the second stair surface 372, the risk of the connection structure between the insulating member 4 and the second stair surface 372 rubbing against the casing 11 and falling off can be reduced, and the reliability of the connection between the insulating member 4 and the support 3 can be further improved.

[0108] In some embodiments, the first stepped surface 371 is further away from the active material coated portion 21 than the outer surface of the insulating member 4. That is, the first stepped surface 371 extends beyond the connection point between the support 3 and the insulating member 4. In the process of installing the battery core assembly 2 with the support 3 into the casing 11, first the support 3 enters the casing body 111 through the opening 1110, and then the active material coated portion 21 encasing the insulating member 4 enters the casing body 111 through the opening 1110.

[0109] Since the first stepped surface 371 is further away from the active material coated portion 21 than the outer surface of the insulating member 4, during the process of attaching it to the casing, the first stepped surface 371 protects the edges of the insulating member 4 and the edges of the active material coated portion 21, reducing the occurrence of the edges of the insulating member 4 and the edges of the active material coated portion 21 rubbing against the inner wall of the casing 11. Furthermore, it protects the connection position between the insulating member 4 and the second stepped surface 372, reducing the risk of the connection structure between the insulating member 4 and the second stepped surface 372 rubbing against the casing 11 and falling off, thereby further improving the reliability of the connection between the insulating member 4 and the support 3.

[0110] Referring again to Figure 15, the battery cell 10 further includes an insulating member 4, the insulating member 4 encloses the active material coated portion 21, and the insulating member 4 is connected to a surface of the main body 36 that is separated from the casing cover 112.

[0111] By connecting at least a portion of the insulating member 4 to the wall surface of the main body 36 away from the battery core assembly 2, on the one hand, when installing the battery core assembly 2 with the support 3 into the casing 11, the casing 11 does not rub against the edge of the insulating member 4, nor does it rub against the connection point between the insulating member 4 and the main body 36, and the connection point between the two is not easily pulled apart during the installation process into the casing. This reduces the movement and slippage of the insulating member 4 during the installation process of the battery core assembly 2 into the casing, improves the reliability of the connection between the insulating member 4 and the support 3, reduces the risk of the insulating member 4 falling off, and consequently reduces the risk of corrosion of the casing 11 due to exposure of the battery core assembly 2, the risk of failure of the battery core assembly 2 itself, and the risk of leakage. Furthermore, it improves the reliability and stability of the battery cell 10. Also, by connecting at least a portion of the insulating member 4 to the wall surface of the main body 36 away from the battery core assembly 2, the dimensions of the insulating member 4 may be designed to be longer, allowing it to be applied to battery core assemblies 2 of different dimensions, resulting in higher compatibility and manufacturability. On the other hand, after the support 3 and the battery core assembly 2 are installed in their predetermined positions within the casing 11, the insulating member 4 is pressed between the wall surface of the casing 11 facing the opening 1110 and the main body 36. This further reduces the risk of the insulating member 4 falling off, reduces the risk of failure of the battery core assembly 2 due to exposure, and at the same time reduces the risk of corrosion of the casing 11, thereby improving the reliability and stability of the battery cell 10.

[0112] According to some selectable embodiments of the present invention, the insulating member 4 is continuously connected in an annular manner in the circumferential direction to the wall surface of the main body 36 away from the battery core assembly 2. Here, annular connection means that the connection points between the insulating member 4 and the main body 36 extend along the circumferential direction of the main body 36 to form a sealed annulus.

[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, further improving the reliability of the mounting of the battery core assembly 2 to the casing, and ensuring the reliability and stability of the battery cell 10.

[0114] In the embodiment of the present invention, the insulating member 4 is connected to the wall surface of the support 3 away from the battery core assembly 2 in an annular manner at intervals in the circumferential direction. That is, there are multiple connection positions between the insulating member 4 and the support 3, and these 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 connection steps, and improve manufacturing efficiency.

[0115] Naturally, in other embodiments of the present invention, the walls of the insulating member 4 and the support 3 that are separated from the battery core assembly 2 may be connected in a continuous, annular manner in the circumferential direction. Here, annular connection means that the connection points between the insulating member 4 and the support 3 extend along the circumferential direction of the support 3 to form a closed annulus. By installing 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, further improving the reliability of the mounting of the battery core assembly 2 to the casing, and ensuring the reliability and stability of the battery cell 10.

[0116] Furthermore, in other embodiments of the present invention, the connection points between the insulating member 4 and the support 3 may be concentrated on opposing sides, adjacent sides, or multiple sides of the support 3, and may be specifically selected according to the actual shapes of the battery core assembly 2 and the support 3, and are not limited thereto.

[0117] Referring again to Figure 15, in the embodiment of the present invention, 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 the area of ​​the connection mark 401 may be designed to be larger than that of the related art to make the connection stronger and reduce the risk of the insulating member 4 falling off.

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

[0119] It should be noted that in the embodiments of this application, the shape of the connection marks 401 may be rectangular, circular, or elliptical, or it may be an irregular shape. The arrangement of the multiple 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 shape of the battery core assembly 2 and the support 3 is square or rectangular, the multiple connection marks 401 may be distributed near the four sides of the support 3, or they may be concentrated near the opposing sides of the support 3. Alternatively, for example, if the cross-sectional shape of the battery core assembly 2 and the support 3 is circular, the multiple connection marks 401 can be uniformly distributed in the circumferential direction of the wall surface of the support 3 away from the battery core assembly 2.

[0120] Naturally, 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 the needs. The number of connection marks 401 can be appropriately increased to save materials and reduce costs, based on ensuring the reliability of the connection between the insulating member 4 and the support 3.

[0121] As an example, the battery core assembly 2 is a rectangular parallelepiped. In the embodiments of the present application, the support 3 may be a rectangular plate-like member having a corresponding shape, the support 3 is installed on one wall surface 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 an 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 surface 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, and the number of connection marks 401 formed by the insulating member 4 connecting near the corresponding edge may increase or decrease depending on the dimensions of the corresponding edge, and is not limited to any of these embodiments of the present application.

[0122] In the above proposed technology, on the one hand, hot melt connections facilitate the mating of the insulating member 4 and the support 3, improving assembly efficiency and ensuring the efficiency of mounting the battery core assembly 2 to the casing, thereby saving assembly and manufacturing costs. On the other hand, regardless of whether the connection marks 401 extend in annular shape in the circumferential direction or are spaced apart in the circumferential direction, the robustness of the connection between the insulating member 4 and the support 3 is improved, enhancing the reliability and stability of the connection between the insulating member 4 and the support 3, and significantly reducing the risk of the insulating member 4 falling off. At the same time, by arranging the marks spaced apart in the circumferential direction, compared to the case where they extend in annular shape in the circumferential direction, material savings and cost reductions can be achieved by ensuring the reliability of the connection between the insulating member 4 and the support 3.

[0123] Referring again to Figure 13, and further to Figures 16 and 17, Figure 16 is a schematic diagram of the structure of the support 3 of the battery cell 10 according to some embodiment of the present application. Figure 17 is a schematic diagram of the structure of the support 3 of the battery cell 10 according to some other embodiment of the present application. In order to facilitate the connection of the conductive portion 22 to the pole post 12 from the side of the active material coated portion 21 adjacent to the support 3, in the embodiment of the present application, the conductive portion 22 is connected to the side of the active material coated portion 21 adjacent to the main body 36, the main body 36 has a through hole 311, and the conductive portion 22 is connected to the pole post 12 by passing through the through hole 311.

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

[0125] It is understood that the through-hole 311 should penetrate the conductive part 22, provided that the outer surface of the conductive part 22 is in direct contact with the wall of the through-hole 311, and there is a gap between the outer surface of the conductive part 22 and the wall of the through-hole 311, in order to ensure that the conductive part 22 is not damaged.

[0126] In the above proposed technology, on the one hand, by providing through-holes 311 in the main body 36, the support 3 can play the role of converging and housing the conductive part 22, making it easier to connect the conductive part 22 to the pole 12 and improving the reliability and convenience of assembling the battery cell 10. On the other hand, because the support 3 converges the conductive part 22, the structure of the original plastic component in the battery cell 10 can be eliminated, and by fitting the support 3 to the insulating member 4, insulation can be achieved between the entire active material coated part 21 and the casing 11, effectively reducing manufacturing costs and production costs.

[0127] Naturally, the conductive part 22 may be installed on one side of the support 3, and the conductive part 22 is not in a mating relationship with the support 3.

[0128] In some embodiments of the present application, the support 3 may be an integral structure or a separate structure. Referring to Figure 16, when the support 3 is an integral structure, the through-hole 311 is formed in the form of a through-hole that penetrates the support 3. This makes the integral structure of the support 3 easy to manufacture, provides relatively high reliability, and facilitates assembly of the support 3 with the casing assembly 1, improving assembly efficiency and mating stability. As can be seen, how the support 3 is manufactured can be specifically selected depending on the material of the support 3. For example, if the support 3 is an insulating plastic member, an integral structure of the support 3 can be obtained by injection molding.

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

[0130] In the embodiment of the present application, both the first support 33 and the second support 34 are elongated plate-like structures, and they may be detachably connected, for example, they can be fitted together by insertion or engagement, making assembly easier. At the same time, the side of the first support 33 adjacent to the second support 34 has a semi-perforated structure, and the side of the second support 34 adjacent to the first support 33 also has a semi-perforated structure that conforms to its shape, and the semi-perforated structures of the first support 33 and the second support 34 jointly surround an annular through-hole 311. That is, a through-hole 311 is defined between the first support 33 and the second support 34.

[0131] In the above proposed technology, the through-hole 311 is defined by the fitting of the first support 33 and the second support 34. When the support 3 is assembled to the battery core assembly 2, it is not necessary to pass the conductive portion 22 through the through-hole 311 from one end to the other. The first support 33 and the second support 34 can be assembled to the position of the conductive portion 22 and clamp it, as the through-hole 311 surrounds the conductive portion 22. This facilitates the assembly of the support 3 and the battery core assembly 2, improving assembly efficiency.

[0132] As a selective solution, if the cross-section of the through-hole 311 is elongated, the first support 33 and the second support 34 are positioned on both sides of the through-hole 311 in the width direction, for example, if the width direction of the through-hole 311 is left-right, the first support 33 and the second support 34 are located on the left and right sides of the through-hole 311, facilitating the fitting of the first support 33, the second support 34 and the conductive part 22.

[0133] Referring to Figure 18, which is a schematic local cross-sectional view of a battery cell 10 provided in some embodiments of the present application. A siding groove 393 is provided on the side of the main body 36 away from the active material coated portion 21, the siding groove 393 communicates with a through hole 311, and the siding groove 393 is used to accommodate at least a portion of the pole column 12.

[0134] Here, the shape of the receiving groove 393 can be adapted to the shape of the pole column 12. For example, if the cross-sectional shape of the pole column 12 is elongated, the shape of the receiving groove 393 may be a regular shape such as a square, rectangle, ellipse, or oblong, or it may be an irregular shape. Alternatively, for example, if the cross-sectional shape of the pole column 12 is circular, the shape of the receiving groove 393 may be a circular, square, or oblong shape.

[0135] It is understood that the outer surface of the pole post 12 may be in direct contact with the groove side wall of the housing groove 393, and there may be a gap between the outer surface of the pole post 12 and the groove side wall of the housing groove 393, and that it is sufficient to accommodate at least a portion of the pole post 12 in the housing groove 393 in order to ensure that the pole post 12 is not damaged.

[0136] In the above proposed technology, on the one hand, the housing groove 393 accommodates at least a portion of the pole post 12, making the overall structure of the battery cell 10 more compact and reliable, which is advantageous for improving the overall energy density of the battery 100. On the other hand, by installing the housing groove 393, the pole post 12 and the casing 11 are partially insulated by the support 3, further improving the stability and reliability of the battery cell 10. Furthermore, by housing the pole post 12 in the housing groove 393, the stability and reliability of the pole post 12 are improved, thereby further improving the stability and reliability of the battery cell.

[0137] Referring again to Figure 18, a positioning section 32 is installed on the side of the main body 36 that is separated from the active material coated section 21. The positioning section 32 is circumferentially arranged around the through hole 311 and extends in a direction approaching the pole column 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 some other embodiments, the positioning portion 32 may include two opposing boss structures 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 positioned 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 proposed technology, by installing the positioning part 32, the support 3 and pole column 12 can be positioned and attached during the assembly process of the support 3 and pole column 12 by fitting the positioning part 32 with the through-hole 311, which is advantageous for improving the assembly efficiency of the battery cell 10. Furthermore, when the conductive part 22 penetrates through the through-hole 311, the positioning part 32 can restrain, converge, or support the conductive part 22, making it easier to connect the conductive part 22 with the pole column 12, thereby improving the assembly efficiency and assembly quality of the battery cell 10.

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

[0141] In the above proposed technology, on the one hand, by installing the pole column 12 as a hollow structure and fitting the positioning part 32 into the hollow structure, the conductive part 22 can be guided to connect to the pole column 12, improving the reliability of the connection and ensuring assembly efficiency and quality. On the other hand, the conductive part 22 can be housed in the housing part 121, improving the assembly efficiency of the conductive part 22, saving the space occupied by the conductive part 22, and making full use of the space of the battery cell 10, the fitting between the support 3 and the pole column 12, and between the support 3 and the conductive part 22 becomes tighter and more reliable, the structure of the battery cell 10 becomes more compact, and it is advantageous to improve the energy density of the battery cell 10. In addition, the fitting of the positioning part 32 and the housing part 121 allows the support 3 and the pole column 12 to be positioned and attached, which is advantageous in improving the assembly efficiency of the battery cell 10.

[0142] Referring again to Figure 18 and further to Figure 19, Figure 19 is a cross-sectional view of the structure of the support 3 of the battery cell 10 according to several embodiments of the present application. A guide groove 312 communicating with a 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, and the cross-sectional area of ​​the guide groove 312 gradually increases along the direction of the main body 36 approaching the active material coated portion 21.

[0143] Specifically, the groove wall of the guide groove 312 may be an inclined surface or an arc-shaped surface extending from the inside to the outside in the direction approaching the active material coated portion 21. Here, "inside" refers to a position close to the center of the guide groove 312, while "outside" 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 part 22, but also retract the conductive part 22, preventing it from being crushed, reducing the probability of the conductive part 22 becoming flimsy or folded, and thus reducing redundancy.

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

[0146] When the electrolyte is injected, it flows along the first injection guide groove 392, providing a penetration path for the electrolyte. Furthermore, the first injection guide groove 392 enhances the fluidity of the electrolyte, improves the injection speed, and shortens the chemical standing time. In addition, by installing the first injection guide groove 392, the contact area between the electrolyte and the active material coated section 21 is increased, which can mitigate the problem of poor penetration of the active material coated section 21.

[0147] Here, at least one first liquid injection guide groove 392 communicates with a 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 and further increasing the contact area between the electrolyte and the active material coating portion 21.

[0148] Referring again to Figure 20, in an embodiment in which the support 3 is a single-piece structure and two pole columns 12 are installed in the casing 11, both ends of the first electrolyte guide groove 392 can correspond to the positions of the two pole columns 12, and both ends of the first electrolyte guide groove 392 communicate with two guide grooves 312, so that the electrolyte can flow along the first electrolyte guide groove 392 toward the two guide grooves 312.

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

[0150] In some embodiments, the support 3 may be provided with a second liquid injection guide groove (not shown) depending on the needs, the second liquid injection guide groove being located on the side of the support 3 that is away from the active material coating section 21. By installing it in this way, when the liquid is injected, the electrolyte flows along the first liquid injection guide groove 392 and / or the second liquid injection guide groove, providing a penetration path for the electrolyte, increasing the fluidity of the electrolyte, improving the injection speed, and shortening the chemical standing time.

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

[0152] Referring again to Figure 17, in the embodiment of the present application, the conductive portion 22 is connected to the side of the active material coated portion 21 adjacent to the support 3, and the pole column 12 is provided with a housing portion 121, in which at least a portion of the conductive portion 22 is housed, and is used to guide the conductive portion 22 into the housing portion 121 and to facilitate electrical connection and mating between the conductive portion 22 and the pole column 12. In other words, the pole column 12 is installed as a hollow structure.

[0153] Of these, at least a portion may be completely housed in the housing portion 121, or a portion of the conductive portion 22 may be housed in the housing portion 121. Since the housing portion 121 is installed on the pole column 12, the hollow structure of the housing portion 121 can reduce the weight of the pole column 12 to some extent, thereby improving the gravimetric energy density of the battery cell 10 and the battery 100. At the same time, by installing the pole column 12 as a hollow structure and fitting the positioning part 32 into the hollow structure, the conductive part 22 can be guided to connect to the pole column 12, improving the reliability of the connection and ensuring assembly efficiency and quality. On the other hand, the conductive part 22 can be housed in the housing part 121, improving the assembly efficiency of the conductive part 22 and saving the space occupied by the conductive part 22. By making full use of the space of the battery cell 10, the fitting between the support 3 and the pole column 12, and between the support 3 and the conductive part 22, becomes tighter and more reliable, the structure of the battery cell 10 becomes more compact, and is more advantageous in improving the energy density of the battery cell 10.

[0154] More specifically, by housing part or all of the conductive portion 22 in the housing portion 121, the portion of the conductive portion 22 located in the housing portion 121 can occupy space within the pole column 12, reducing the space occupied by the conductive portion 22 within the casing 11. If the dimensions of the casing 11 are fixed, a larger active material coated portion 21 can be accommodated, saving some space within the casing 11 to improve the volumetric energy density of the battery cell 10. For example, if the conductive portion 22 is drawn out from the side of the active material coated portion 21 that is close to the pole column 12, the space occupied by the conductive portion 22 between the active material coated portion 21 and the pole column 12 can be saved, increasing the dimensions of the active material coated portion 21 in the direction of drawing out the conductive portion 22, reducing the distance between the active material coated portion 21 and the pole column 12, and improving the energy density of the battery cell 10.

[0155] At the same time, by housing at least a portion of the conductive portion 22 in the housing 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 be improved. In addition, by housing at least a portion of the conductive portion 22 in the housing portion 121 in order to occupy space within the pole column 12, the redundancy of the conductive portion 22 in the casing 11 can be reduced to at least some extent, the probability of a short circuit between the conductive portion 22 and the active material coated portion 21 can be reduced, the probability of a short circuit in the battery cell 10 can be reduced, and the reliability and stability of the operation of the battery cell 10 and the battery 100 can be improved.

[0156] It should be explained that, in the embodiment of the present invention, the position of the housing portion 121 can be located not only on the side of the pole column 12 facing the active material coated portion 21, but also on the side of the pole column 12 away from the active material coated portion 21.

[0157] Refer to Figures 22 and 23 for illustrative purposes, where Figure 22 is a schematic local cross-sectional view of a battery cell 10 provided in some embodiments of the present application. Figure 23 is a schematic local cross-sectional view of a battery cell 10 provided in some embodiments of the present application. When the housing portion 121 is located on the side of the pole 12 facing the active material coated portion 21, the housing portion 121 includes a first housing groove 12110, the surface of the pole 12 facing the active material coated portion 21 is the inner end face 122 of the pole, the groove opening of the first housing groove 12110 is formed on the inner end face 122 of the pole, and at least a portion of the conductive portion 22 is housed in the first housing groove 12110.

[0158] Exemplary, the first accommodating groove 12110 is a groove body, which is a groove-shaped structure having a certain depth. For example, when the pole column 12 is installed on the upper end wall of the casing 11 and the inner end face 122 of the pole column is the lower surface of the pole column 12, the first accommodating groove 12110 is formed as an accommodating groove with a groove opening that faces downward and a groove wall that is recessed upward. Alternatively, when the pole column 12 is installed on the lower end wall of the casing 11 and the inner end face 122 of the pole column is the upper surface of the pole column 12, the first accommodating groove 12110 is formed as an accommodating groove with a groove opening that faces upward and a groove wall that is recessed downward.

[0159] In the above proposed technology, on the one hand, by providing a first housing groove 12110 in the pole column 12, the weight of the pole column 12 can be reduced to some extent, thereby improving the gravimetric energy density of the battery cell 10 and the battery 100. On the other hand, since the opening of the first housing groove 12110 is formed on the inner end face 122 of the pole column, and the inner end face 122 is a surface close to the active material coated portion 21 of the pole column 12, the first housing groove 12110 can be opened toward the active material coated portion 21, and furthermore, the conductive portion 22 can easily extend into the first housing groove 12110, improving assembly efficiency. In addition, the first housing groove 12110 in this form is easy to process, improving manufacturing efficiency.

[0160] Furthermore, the first housing groove 12110 can be easily processed to have a larger volume, allowing it to accommodate more conductive parts 22. At the same time, since the first housing groove 12110 opens toward the active material coating part 21, the first housing groove 12110 can also be used as a buffer and temporary storage structure for the electrolyte. The casing 11 can accommodate more electrolyte, and since electrolyte is consumed during the charging and discharging process of the battery cell 10, having more electrolyte can extend the service life of the battery cell 10. Moreover, since the first housing groove 12110 opens toward the active material coating part 21, the first housing groove 12110 can also be used as a gas containment and buffer structure for gases generated inside the battery core assembly 2, reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0161] Furthermore, since the first housing groove 12110 is located inside the pole column 12, external foreign matter and impurities are less likely to enter the first housing groove 12110, reducing the influence of external foreign matter 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] Referring again to Figure 22, in the embodiments of the present application, the method of connecting the pole 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 pole post 12 is attached to the mounting hole 113 by riveting. Naturally, as can be understood, when the two are fitted together by welding or other means, the casing 11 may have a mounting hole 113 to facilitate the attachment of the pole post 12 to the casing 11 through the mounting hole 113, and is not limited thereto.

[0163] At the same time, the first accommodating groove 12110 can be positioned corresponding to the mounting hole 113. In other words, the orthographic projection of the first accommodating groove 12110 lies within the orthographic projection range of the mounting hole 113 on the projection plane perpendicular to the axial R of the pole column 12. Therefore, the first accommodating groove 12110 can have a large depth to accommodate more conductive parts 22, and furthermore, the space occupied by the conductive parts 22 within the casing 11 can be greatly reduced.

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

[0165] It should be noted that the specific shape of the first accommodating groove 12110 is not limited. For example, it may be a cylindrical groove with a rectangular, elliptical, or racetrack-shaped cross-section, a trapezoidal groove with a rectangular cross-section and gradually changing cross-sectional dimensions, a hemispherical groove with a circular cross-section and gradually changing cross-sectional dimensions, or a semi-elliptical groove with an elliptical cross-section and gradually changing cross-sectional dimensions. It may have a regular or irregular shape. Therefore, the depth H1 of the first accommodating groove 12110 refers to the maximum depth of the first accommodating groove 12110 along the axial radius R of the pole column 12.

[0166] In the axial radius R of the pole column 12, the depth H1 of the first housing groove 12110 is greater than or equal to the minimum distance H2 from the inner end face 122 of the pole column to the mounting hole 113, allowing for full utilization of the volume of the pole column 12. This makes it advantageous to increase the depth of the first housing groove 12110, which allows for the accommodation of more conductive parts 22. Furthermore, it significantly reduces the space occupied by the conductive parts 22 within the casing 11, 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, because the first housing groove 12110 is relatively deep, it can accommodate gases generated by the battery core assembly 2, ensuring the reliability and stability of the battery cell 10, and also allow for the accommodation of 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 coated portion 21 and the pole column 12, in some embodiments of the present application, the electrical connection position between the conductive portion 22 and the pole column 12 can be located in the groove wall of the first housing groove 12110 formed by the housing portion 121.

[0168] For example, the conductive part 22 and the pole column 12 can be electrically connected by welding, and the electrical connection location is the welding location between the conductive part 22 and the pole column 12. At the same time, the welding method between the conductive part 22 and the pole column 12 is not limited, and may be laser welding, for example, and depending on factors such as the position, angle, or structure of the welding area, vertical welding, inclined welding, overlap welding, edge welding, etc. can be selected. In other embodiments of the present invention, the conductive part 22 and the pole column 12 can be electrically connected by other methods instead of welding, for example, by installing conductive adhesive or conductive pins. To simplify the explanation, the following description will be based on the example of forming an electrical connection between the conductive part 22 and the pole column 12, and the welding location being the electrical connection location between the conductive part 22 and the pole column 12.

[0169] Specifically, the pole 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 to form a first housing groove 12110, and the electrical connection point between the conductive portion 22 and the pole post 12 is 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 proposed technology, by setting the electrical connection position between the conductive part 22 and the pole column 12 on at least one of the first end wall 12111 and the first side wall 12113, the first housing groove 12110 not only serves to accommodate at least a portion of the conductive part 22, but the groove wall of the first housing groove 12110 also serves to realize an electrical connection with the conductive part 22. As a result, the structure of the pole column 12 can be simplified, the processing of the pole column 12 can be made easier, the structure of the conductive part 22 can be simplified, the redundancy of the conductive part 22 can be reduced, and the cost of the conductive part 22 can be reduced. Furthermore, by realizing an electrical connection with the conductive part 22 using the groove wall of the first housing groove 12110, the electrical connection area between the conductive part 22 and the pole column 12 can be made relatively large, which not only reduces the difficulty of electrical connection but also improves the reliability and stability of the electrical connection, and ultimately improves the performance of the battery cell 10.

[0171] Furthermore, by positioning the electrical connection point between the conductive part 22 and the pole post 12 within the first housing groove 12110, it is possible to avoid the electrical connection point protruding outside the pole post 12 and occupying space other than the pole post 12. In addition, the electrical connection point is protected by the pole post 12, thereby improving the reliability and stability of the electrical connection between the conductive part 22 and the pole post 12.

[0172] Furthermore, in the embodiment of the present invention, the first end wall 12111 is configured as a sealed structure without through holes in order to isolate the first housing groove 12110 from the external space of the casing 11, thereby avoiding the problem of electrolyte leakage from the first housing groove 12110 within the casing 11.

[0173] Referring again to Figures 22 and 23, in several selective embodiments, the local shape of the conductive portion 22 is adapted to the local shape of the first end wall 12111 and bonded to it to achieve an electrical connection, so that the electrical connection position between the conductive portion 22 and the first end wall 12111 extends in the longitudinal or widthwise direction of the first end wall 12111. For example, if the first end wall 12111 is planar, the local portion of the conductive portion 22 is also planar and bonded to the first end wall 12111, and the bonded position is electrically connected, for example, by welding. This can increase the electrical connection area and improve the reliability and stability of the electrical connection.

[0174] Furthermore, if the electrical connection between the conductive portion 22 and the first end wall 12111 is welded, the first end wall 12111 is located on the side of the first housing groove 12110 away from the active material coated portion 21, which facilitates the welding process. For example, welding may be performed from the side of the pole column 12 away from the active material coated portion 21.

[0175] It should be explained that the shape of the first end wall 12111 is not limited and may be, for example, a flat plate or an arc-shaped plate. Here, if the first end wall 12111 is a flat plate structure, it is positioned at an angle with the axial direction R of the pole column 12, and may be, for example, a flat plate structure perpendicular to the axial direction R of the pole column 12, or it may be an inclined plate structure not perpendicular to the axial direction R of the pole column 12, but the direction of inclination is not limited.

[0176] Naturally, in other embodiments of the present invention, the electrical connection points between the conductive portion 22 and the first end wall 12111 do not necessarily extend along the length or width of the first end wall 12111, but may be, for example, a plurality of discretely placed points. For example, the conductive portion 22 has a plurality of spaced portions that are welded to the first end wall 12111, and such a description is omitted here.

[0177] Referring to Figure 24, which is a schematic local cross-sectional view of a battery cell 10 provided by some embodiments of the present application. When the conductive portion 22 is electrically connected to the first end wall 12111, a first recessed groove 12112 may be provided in the first end wall 12111, the recessing direction of the first recessed groove 12112 is away from the active material coated portion 21. At least a portion of the location where the conductive portion 22 is electrically connected to the first end wall 12111 is located within the first recessed groove 12112. Exemplarily, at least a portion of the conductive portion 22 may be provided within the first recessed groove 12112 and connected to a portion of the first end wall 12111 that defines the first recessed groove 12112.

[0178] In the above proposed technology, on the one hand, the first recessed groove 12112 can be used to pre-position and limit the position of the conductive part 22 to the electrical connection position, which is advantageous not only for accurately aligning the position and achieving electrical connection, thereby improving production efficiency, but also for improving the stability and reliability of the conductive part 22 and ensuring the stability and reliability of the charging and discharging process of the battery cell 10. On the other hand, by installing the first recessed groove 12112 in the first end wall 12111, the local thickness of the first end wall 12111 can be locally reduced, which is advantageous not only for welding, but also for reducing the weight of the pole column 12 and improving the gravimetric 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 on the pole column 12 as needed, the first groove 126 being located on the side of the pole column 12 away from the active material coated portion 21, that is, the surface of the pole column 12 on the side away from the active material coated portion 21 is the outer end surface 123 of the pole column, and the groove opening of the first groove 126 is formed on the outer end surface 123 of the pole column.

[0180] As can be understood, the first groove 126 is a groove body, and the groove body is a groove-like structure having a certain depth. Furthermore, when the pole column 12 is installed on the upper end wall of the casing 11 and the outer end face 123 of the pole column is the upper surface of the pole column 12, the first groove 126 has a groove opening that is open upward and a groove wall that is recessed downward (i.e., close to the battery core assembly 2). direction It is formed as a first groove (concave toward the right). Also, for example, if the pole column 12 is installed on the lower end wall of the casing 11 and the outer end surface 123 of the pole column is the lower surface of the pole column 12, the first groove 126 has a groove opening that is open downwards and a groove wall that is concave upwards (i.e., away from the battery core assembly 2). direction It is formed as a first groove (concave towards the left).

[0181] In the above proposed technology, on the one hand, the weight of the pole column 12 can be further reduced by installing the first groove 126 on the pole column 12 so as to improve the gravimetric energy density of the battery cell 10 and the battery 100. On the other hand, the first groove 126 is located on the outside of the pole column 12, that is, it opens toward the side away from the inside of the casing 11 of the pole column 12, and the first groove 126 can be used to accommodate or attach structural members electrically connected to each battery cell 10 in the battery 100 so as to make full use of the space inside the pole column 12 and improve the space utilization rate and volumetric energy density of the battery 100.

[0182] Furthermore, by having both a first housing groove 12110 and a first recessed groove 126 in the pole column 12, the first recessed groove 126 is located on the side of the first housing groove 12110 away from the active material coated portion 21, and the first recessed groove 126 opens in a direction away from the first housing groove 12110. This is advantageous for laser welding the conductive portion 22 and the first end wall 12111 through the first recessed groove 126 from the outside of the pole column 12, i.e., from the side of the pole column 12 away from the active material coated portion 21. In other words, the electrical connection between the conductive portion 22 and the pole column 12 can be easily achieved by external welding. In short, the above structure makes it easy to externally weld the pole column 12 and the conductive portion 22 through the first recessed groove 126, facilitating the processing and manufacturing of the battery cell 10 and saving processing and manufacturing costs.

[0183] Furthermore, in order to easily and effectively weld the conductive portion 22 and the groove wall of the first housing groove 12110 via the first recessed groove 126 and to improve the welding reliability between the conductive portion 22 and the groove wall of the first housing groove 12110, in the embodiment of the present application, the portion between the first recessed groove 126 and the first housing groove 12110 can be laser-welded to the conductive portion 22. That is, the gap portion 127 shown in Figure 24 and the conductive portion 22 can be laser-welded to realize an electrical connection between the battery core assembly 2 and the pole column 12. The thickness of the spacing portion 127 of the pole column 12 located between the first groove 126 and the first housing groove 12110 is relatively thin, and the spacing portion 127 isolates the first groove 126 and the first housing groove 12110. The wall surface of the spacing portion 127 on the side close to the active material coated portion 21 can be used as 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 in achieving welding between the conductive portion 22 and the first end wall 12111 via the first groove 126, thereby improving the convenience and reliability of welding.

[0184] In some embodiments, the first housing groove 12110 may be configured in a shape such as a rectangle, ellipse, or racetrack shape, where the length of the cross-section is greater than the width, and the weld mark formed by welding the conductive part 22 and the pole column 12 may be a long weld mark parallel to the length direction of the first housing groove 12110 in order to improve the reliability of the welding and increase the current passage performance. For example, when the conductive part 22 and the first end wall 12111 are welded to form a long weld mark, 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, in order to ensure the convenience and reliability of the welding while maintaining the current passage capability of the battery cell 10.

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

[0186] In the above proposed technology, by installing a groove cover 7 that seals the first groove 126, the pole post 12 can achieve indirect electrical connection with the bus member via the groove cover 7. Depending on the position and structure of the groove cover 7, the electrical connection between the groove cover 7 and the bus member becomes more convenient and the electrical connection area becomes larger. As a result, by installing the groove cover 7, the electrical connection of adjacent battery cells 10 within the battery 100 can be facilitated, and since the electrical connection position between the battery cells 10 is located at the groove cover 7, the electrical connection position between the conductive part 22 and the pole post 12 can be separated by the first groove 126, reducing interference between the two and further improving the stability and reliability of the battery cells 10.

[0187] For illustrative purposes, refer to Figure 25, which is a schematic local cross-sectional view of a battery cell 10 provided in some embodiments of the present application, wherein the housing 121 may be configured to include a second housing groove 12120, the surface of the pole 12 away from the active material coated portion 21 being the pole 123, the groove opening of the second housing groove 12120 being formed on the pole 123, the second housing groove 12120 communicating with the interior of the casing 11 via a through hole 12130, the conductive portion 22 being drilled in the through hole 12130 and at least a portion of which is housed in the second housing groove 12120.

[0188] As can be understood, the second accommodating groove 12120 is a groove body, and the groove body is a groove-shaped structure having a certain depth. For example, if the pole column 12 is installed on the upper end wall of the casing 11 and the outer end surface 123 of the pole column is the upper surface of the pole column 12, the second accommodating groove 12120 is formed as an accommodating groove with a groove opening that faces upward and a groove wall that is recessed downward. Alternatively, for example, if the pole column 12 is installed on the lower end wall of the casing 11 and the outer end surface 123 of the pole column is the lower surface of the pole column 12, the second accommodating groove 12120 is formed as an accommodating groove with a groove opening that faces downward and a groove wall that is recessed upward.

[0189] In the above proposed technology, referring again to Figure 25, on the one hand, by installing the second housing groove 12120 on the pole column 12, the weight of the pole column 12 can be reduced to some extent, thereby improving the gravimetric energy density of the battery cell 10 and the battery 100. On the other hand, the groove opening of the second housing groove 12120 is formed on the outer end surface 123 of the pole column, and the outer end surface 123 of the pole column is a surface away from the active material coated portion 21 of the pole column 12. Therefore, the second housing groove 12120 is away from the active material coated portion 21. The opening can be opened in the direction of separation, and in this way, when at least a part of the conductive part 22 is housed in the second housing groove 12120, the housing and arrangement of the conductive part 22 can be easily achieved through the groove opening of the second housing groove 12120, and electrical connection operations between the conductive part 22 and the pole column 12 can be easily achieved through the groove opening of the second housing 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 housing groove 12120 can pass through the through hole 12130 and communicate with the inside of the casing 11, the second housing groove 12120 may also be used as a buffer and temporary storage structure for the electrolyte, allowing the casing 11 to accommodate more electrolyte. As electrolyte is consumed during the charging and discharging process of the battery cell 10, having more electrolyte can extend the service life of the battery cell 10. Furthermore, since the second housing groove 12120 passes through the through hole 12130 and communicates with the inside of the casing 11, the second housing groove 12120 can also be used as a gas containment and buffer structure for gas generated inside the battery core assembly 2, reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0191] It should be explained that when the housing portion 121 has a second housing groove 12120, the conductive portion 22 is drilled in the through hole 12130, and at least a part of it is housed in the second housing groove 12120, the electrical connection position between the conductive portion 22 and the pole column 12 is not limited.

[0192] For example, when the conductive portion 22 is drilled in the through hole 12130 and at least partially housed in the second housing groove 12120, in the embodiment of the present application, the electrical connection position between the conductive portion 22 and the pole column 12 is located at the hole wall of the through hole 12130 formed by the pole column 12.

[0193] In the above proposed technology, by setting the electrical connection position between the conductive part 22 and the pole column 12 on the wall of the through hole 12130, it becomes easier to electrically connect the conductive part 22 and the pole column 12 via the second accommodating groove 12120. Furthermore, when the electrical connection area between the conductive part 22 and the pole column 12 is relatively large, the through hole 12130 can be sealed by the electrical connection between the conductive part 22 and the pole column 12, saving on sealing costs and reducing electrolyte leakage, thereby saving on sealing components.

[0194] Specifically, the conductive part 22 and the hole wall of the through-hole 12130 can be welded at the position where the through-hole 12130 connects to the second housing groove 12120, making the work easier. Furthermore, to improve the problem of electrolyte leakage from the casing 11 through the through-hole 12130, the welding imprint can be controlled to achieve sealing of the through-hole 12130 by the weld mark and the conductive part 22.

[0195] Furthermore, exemplary, when the conductive portion 22 is drilled in the through hole 12130 and at least partially housed in the second housing groove 12120, in some other embodiments of the present invention, the electrical connection position between the conductive portion 22 and the pole post 12 may be located at the groove wall of the second housing groove 12120 formed by the pole post 12. This facilitates the electrical connection operation and improves the situation where, for example, when the conductive portion 22 is welded to the groove wall of the second housing groove 12120 formed by the pole post 12, conductive particles produced by welding enter the casing 11 and cause problems such as short circuits.

[0196] Referring again to Figure 25, the pole post 12 includes a second end wall 12121 and a second side wall 12123, the second end wall 12121 located on the side of the second side wall 12123 adjacent to the active material coated portion 21, the second end wall 12121 and the second side wall 12123 surrounding each other to form a second housing groove 12120, a through hole 12130 is provided in the second end wall 12121, and the electrical connection position between the conductive portion 22 and the pole post 12 is located in the second end wall 12121 and / or the second side wall 12123.

[0197] More specifically, since the conductive part 22 and the pole column 12 can be electrically connected by welding, the welding position is the electrical connection position between the conductive part 22 and the pole column 12. In other embodiments of the present invention, the conductive part 22 and the pole column 12 can be electrically connected by other methods instead of welding, such as by installing conductive adhesive or conductive pins, and such methods will not be described here.

[0198] To simplify the explanation, the following description will assume that the conductive part 22 and the pole column 12 form an electrical connection, and that the welding position is the electrical connection position between the conductive part 22 and the pole column 12. For example, in some embodiments, the electrical connection position between the conductive part 22 and the pole column 12 is located at the second end wall 12121 and / or the second side wall 12123, and the conductive part 22 may be welded to at least one of the second end wall 12121 and the second side wall 12123.

[0199] In the above proposed technology, by locating the electrical connection point between the conductive part 22 and the pole column 12 on at least one of the second end wall 12121 and the second side wall 12123, the second accommodating groove 12120 not only serves to accommodate at least a portion of the conductive part 22, but the groove walls of the second accommodating groove 12120 also serve to realize an electrical connection with the conductive part 22. This simplifies the structure of the pole column 12 and facilitates the processing of the pole column 12. Furthermore, since the through hole 12130 is provided in the second end wall 12121, the conductive part 22 can easily pass through the through hole 12130 and extend into the second accommodating groove 12120, thereby simplifying the structure of the conductive part 22, reducing the redundancy of the conductive part 22, and lowering the cost of the conductive part 22. Furthermore, the opening direction of the groove opening of the second housing groove 12120 allows for easy electrical connection between the conductive part 22 and the groove wall of the second housing groove 12120 via the groove opening, reducing the difficulty of electrical connection. Moreover, by utilizing the groove wall of the second housing groove 12120 to achieve electrical connection with the conductive part 22, the electrical connection area between the conductive part 22 and the pole column 12 can be made relatively large, improving the reliability and stability of the electrical connection, and ultimately improving the performance of the battery cell 10.

[0200] Furthermore, by positioning the electrical connection point between the conductive part 22 and the pole post 12 within the second housing groove 12120, it is possible to avoid the electrical connection point protruding outside the pole post 12 and occupying space other than the pole post 12. In addition, the electrical connection point is protected by the pole post 12, thereby improving the reliability and stability of the electrical connection between the conductive part 22 and the pole post 12.

[0201] Referring again to Figure 25, in some embodiments, the local shape of the conductive portion 22 is adapted to the local shape of the second end wall 12121 and is installed by bonding it to the second end wall 12121 so that the electrical connection position between the conductive portion 22 and the second end wall 12121 extends in the longitudinal or widthwise direction of the second end wall 12121. For example, if the second end wall 12121 is flat, the local portion of the conductive portion 22 is also flat and is bonded to the second end wall 12121, and the bonding position is electrically connected, for example, by welding. This increases the electrical connection area and improves the reliability and stability of the electrical connection.

[0202] It should be explained that the shape of the second end wall 12121 is not limited and can be, for example, a flat plate or an arc-shaped plate. Here, if the second end wall 12121 is a flat plate structure, it is positioned at an angle with the axial direction R of the pole column 12, and may be, for example, a flat plate structure perpendicular to the axial direction R of the pole column 12, or it may be an inclined plate structure not perpendicular to the axial direction R of the pole column 12, but the direction of inclination is not limited.

[0203] For example, referring again to Figure 25, if the second end wall 12121 has a flat plate structure, the angle θ between the second end wall 12121 and the axial R of the pole column 12 is equal to 90°, that is, the second end wall 12121 and the active material coated portion 21 are equally spaced along the direction from the through hole 12130 to the second side wall 12123. This facilitates welding between the conductive portion 22 and the second end wall 12121.

[0204] For example, if the angle θ between the second end wall 12121 and the axial R of the pole column 12 is greater than 90°, that is, the second end wall 12121 extends obliquely toward the active material coated portion 21 along the direction from the through hole 12130 to the second side wall 12123. This allows the extension distance of the conductive portion 22 along the second end wall 12121 to be increased, improving the reliability of the electrical connection. Exemplarily, the angle θ between the second end wall 12121 and the axial R of the pole column 12 is 90° to 145°, and may be, for example, 100°, 110°, 120°, 130°, 140°, etc. On the one hand, the processing of the second end wall 12121 becomes easier and electrical connection with the conductive portion 22 becomes easier, and on the other hand, the conductive portion 22 can be accommodated by making relatively sufficient use of the space inside the pole column 12.

[0205] Furthermore, for example, the angle θ between the second end wall 12121 and the axial radius R of the pole column 12 is less than 90°, meaning that the second end wall 12121 extends obliquely away from the active material coated portion 21 along the direction from the through hole 12130 to the second side wall 12123. This allows the extension distance of the conductive portion 22 along the second end wall 12121 to be increased, improving the reliability of the electrical connection. Exemplarily, the angle θ between the second end wall 12121 and the axial radius R of the pole column 12 is 45° to 90°, and may be, for example, 50°, 60°, 70°, 80°, etc. On the one hand, the processing of the second end wall 12121 is made easier and electrical connection with the conductive portion 22 is made easier, and on the other hand, the conductive portion 22 can be accommodated by making relatively sufficient use of the space inside the pole column 12.

[0206] Naturally, the present invention is not limited to these, and in other embodiments of this application, the electrical connection points between the conductive portion 22 and the second end wall 12121 do not necessarily extend along the length or width of the second end wall 12121, but may be a plurality of discretely placed points. For example, the conductive portion 22 has a plurality of spaced portions that are welded to the second end wall 12121, and such details are omitted here.

[0207] Referring again to Figure 25 and further to Figure 26, Figure 26 is a schematic local cross-sectional view of a battery cell 10 provided by some embodiments of the present application. Regardless of the specific value of the angle θ between the second end wall 12121 and the axial R of the pole column 12, in embodiments 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 as needed, the second recessed groove 12122 being a recess formed by the local portion of the second end wall 12121 sinking into one end adjacent to the active material coated portion. At least a portion of the location 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 proposed technology, the portion of the conductive part 22 located within the second recessed groove 12122 is installed to conform to the shape of the second recessed groove 12122 and is bonded together to achieve electrical connection. This allows for pre-positioning and positional restriction of the electrical connection position of the conductive part 22 using the second recessed groove 12122, enabling precise positioning and electrical connection. This is advantageous for improving production efficiency and enhances the stability and reliability of the electrical connection position, thereby guaranteeing the reliability and stability of the charging and discharging operations of the battery cell 10.

[0209] Referring again to Figure 26, in the embodiment of the present application, the method of connecting the pole 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 pole post 12 is attached to the mounting hole 113 by riveting. Naturally, when the two are fitted together by welding or other methods, the casing 11 may have a mounting hole 113, and it is understood that the pole post 12 is attached to the mounting hole 113.

[0210] Selectively, referring again to Figure 25, the second accommodating groove 12120 may be positioned corresponding to the location of the mounting hole 113. In other words, if the orthographic projection of the second accommodating groove 12120 lies within the orthographic projection range of the mounting hole 113 in the projection plane perpendicular to the axial R of the pole column 12, the second accommodating groove 12120 has a relatively large depth, allowing it to accommodate more conductive parts 22, and consequently, the space occupied by the conductive parts 22 within the casing 11 can be reduced more significantly.

[0211] In some embodiments, referring again to Figure 25, when the casing 11 has a mounting hole 113 and the pole post 12 is mounted in the mounting hole 113, the depth H3 of the second housing groove 12120 is greater than or equal to the minimum distance H4 from the outer end face 123 of the pole post to the mounting hole 113 along the axial R of the pole post 12.

[0212] It should be explained that the specific shape of the second storage groove 12120 is not limited, and may be a regular or irregular shape, such as a cylindrical groove with a rectangular, elliptical, or racetrack-shaped cross-section, a trapezoidal groove with a rectangular cross-section and gradually changing cross-sectional dimensions, a hemispherical groove with a circular cross-section and gradually changing cross-sectional dimensions, or a semi-elliptical groove with an elliptical cross-section and gradually changing cross-sectional dimensions. It should be explained that the racetrack shape as 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 housing groove 12120 refers to the maximum depth of the second housing groove 12120 along the axial R of the pole column 12. In the axial R of the pole column 12, the depth H3 of the second housing groove 12120 is greater than or equal to the minimum distance H4 from the outer end face 123 of the pole column to the mounting hole 113, and the volume of the pole column 12 can be fully utilized. As a result, the depth of the second housing groove 12120 becomes greater, which is advantageous for accommodating more conductive parts 22, further reducing the space occupied by the conductive parts 22 within the casing 11, further improving the energy density of the battery cell 10, and further reducing the redundancy of the conductive parts 22 within the casing 11. At the same time, because the second housing groove 12120 is relatively deep, it can accommodate the gas generated by the battery core assembly 2, ensuring the reliability and stability of the battery cell 10, and 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 in some embodiments of the present application, and Figure 28 is an exploded view of the structure of the battery cell 10 shown in Figure 27, in which, in embodiments of the present application, if the housing portion 121 has a second housing groove 12120 of any of the above embodiments, the battery cell 10 may optionally further include a first cover plate 13, the first cover plate 13 which fits onto the pole post 12 and seals the groove opening of the second housing groove 12120, and the first cover plate 13 is electrically connected to the pole post 12.

[0215] In the above proposed technology, by installing the first cover plate 13 so as to seal the groove opening of the second housing groove 12120, leakage of the electrolyte from the casing 11 through the groove opening of the second housing groove 12120 can be prevented. Furthermore, since the first cover plate 13 seals the groove opening of the second housing groove 12120 and is electrically connected to the pole column 12, an indirect electrical connection between the pole column 12 and the bus member can be easily realized using the first cover plate 13, and this is advantageous in increasing the connection area of ​​the electrical connection point and, consequently, in reducing the resistance of the electrical connection point.

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

[0217] Furthermore, it should be noted that the specific configuration of the first cover plate 13 is not limited. For example, in several selective embodiments, Figure 29 is an exploded view of the structure of the first cover plate shown in Figure 28, and referring to Figures 27 to 29, the first cover plate 13 includes a first conductive member 131 and a second conductive member 132 of different materials, the first conductive member 131 being fitted to and electrically connected to the pole post 12, and the second conductive member 132 being fitted to and electrically connected to the first conductive member 131.

[0218] In the above proposed technology, by installing the first cover plate 13 in a composite form and installing the first conductive member 131 so as to be made of the same material as the pole column 12, the electrical connection between the first conductive member 131 and the pole column 12 is facilitated, and for example, the first conductive member 131 and the pole column 12 can be reliably and stably connected by welding. Furthermore, because the second conductive member 132 and the first conductive member 131 are made of different materials, the second conductive member 132 can be used to easily electrically connect to bus members made of different materials than the pole column 12, and for example, the second conductive member 132 and bus members made of the same material as the second conductive member 132 can be reliably and stably connected by welding.

[0219] For example, if pole 12 is a negative pole, and pole 12 is a copper pole and the bus member is an aluminum sheet, the first conductive member 131 can be installed on the copper material and the second conductive member 132 can be installed on the aluminum material. In this case, pole 12 and the first conductive member 131 may be made of the same material and effectively welded together, and the second conductive member 132 and the bus member may be made of the same material and effectively welded together. This allows for effective indirect electrical connection between pole 12 and the bus member via the first cover plate 13. Furthermore, the pole 12 and the first conductive member 131 are welded copper to copper, which offers excellent fluidity, is less prone to cracking, and is advantageous in improving the sealing effect of the welded area.

[0220] Referring again to Figures 27 to 29, in several selectable examples, the first conductive member 131 is located between the second housing groove 12120 and the second conductive member 132. In the above technical proposal, since the first conductive member 131 is located between the second housing groove 12120 and the second conductive member 132, it can separate the second housing groove 12120 and the second conductive member 132. This prevents the electrolyte in the casing 11 from coming into the second housing groove 12120 from the through hole 12130, thereby preventing the electrolyte in that portion from coming into contact with the second conductive member 132, and solving the problem of corrosion of the second conductive member 132 by the electrolyte.

[0221] The method of fitting the first conductive member 131 and the second conductive member 132 is not limited to what needs to be explained. For example, in some embodiments, referring to Figures 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 housing groove 12120 such 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 fastening, engagement, or the like.

[0222] Furthermore, it should be explained that the second conductive member 132 being "exposed" from the groove opening of the second recess 1311 means that the first conductive member 131 does not obstruct the second conductive member 132 at the groove opening position of the second recess 1311, and the second conductive member 132 does not need to protrude from the groove opening of the second recess 1311. For example, the second conductive member 132 may be positioned flush with the surface of the first conductive member 131 on the side away from the second housing groove 12120, or the second conductive member 132 may protrude from the surface of the first conductive member 131 on the side away from the second housing groove 12120.

[0223] In the above proposed technology, by fitting the second conductive member 132 into the first conductive member 131, the difficulty of assembling the first conductive member 131 and the second conductive member 132 can be reduced, improving the fitting stability and convenience of the first conductive member 131 and the second conductive member 132, as well as reducing the thickness of the first cover plate 13, thereby reducing the space occupied by the first cover plate 13 and improving the space utilization rate of the battery cell 10. On the other hand, the second conductive member 132 can be exposed from the surface of the first conductive member 131 away from the second housing groove 12120 through the groove opening of the second recess 1311, which is advantageous for achieving electrical connection between the second conductive member 132 and the bus member outside the pole column 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 separated from the second housing groove 12120, it is suggested that the second groove 1311 opens in a direction away from the active material coated portion 21. For this reason, a portion defining the groove wall of the second groove 1311 of the first conductive member 131 is located between the second housing groove 12120 and the second conductive member 132. This separates the second housing groove 12120 and the second conductive member 132, preventing contact between the electrolyte that has entered the second groove 1311 and the second conductive member 132, and reducing electrolyte leakage.

[0225] Naturally, in other embodiments, the first cover plate 13 does not have to 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 in some embodiments of the present application, and Figure 31 is an exploded view of the structure of the battery cell shown in Figure 30. Referring to Figures 30 and 31, the entire first cover plate 13 can also be installed in a non-composite form processed from the same material, for example, to fit the positive electrode column, but this will not be explained here.

[0226] Referring again to Figures 27 to 29, in some embodiments, the first cover plate 13 is further fitted into the groove of the second housing groove 12120. In the above technical proposal, by fitting the first cover plate 13 into the second housing groove 12120, the difficulty of assembling the first cover plate 13 and the pole post 12 can be reduced, the assembly stability, connection reliability and convenience of the first cover plate 13 and the pole post 12 can be improved, and the space occupied by the first cover plate 13 other than the pole post 12 can be reduced. In addition, since the first cover plate 13 is fitted into the groove of the second housing groove 12120, there can be a relatively sufficient space within the second housing groove 12120 to accommodate the conductive part 22.

[0227] Naturally, in other embodiments of the present invention, the method of fitting the first cover plate 13 to the pole post 12 is not limited to fitting it into the second housing groove 12120. The first cover plate 13 may also be directly placed over the outside of the pole post 12. That is, to facilitate fitting with the bus member of the battery 100, it may be directly placed over the groove opening of the second housing groove 12120, and this embodiment is not limited to this.

[0228] Referring again to Figures 27 to 29, selectively, in the embodiment of the present application, at least a portion of the wall surface where the groove opening of the second housing groove 12120 of the pole column 12 is formed is a guide slope 12126, and the guide slope 12126 is used to guide the fitting of the first cover plate 13 and the groove opening of the second housing groove 12120. In the above technical invention, by processing the wall surface of the groove opening of the second housing groove 12120 into a slope with a guiding function, the difficulty of assembling the first cover plate 13 and the second housing groove 12120 can be reduced and the assembly efficiency of the first cover plate 13 and the second housing groove 12120 can be improved. Furthermore, when the first cover plate 13 is welded to the guide slope 12126, the area of ​​the weld can be increased, the reliability of the welded connection between the first cover plate 13 and the pole column 12 can be improved, and the problem of the molten pool collapsing or the laser entering the pole column 12 during welding can be improved.

[0229] Specifically, referring to Figures 27 to 29, the second housing groove 12120 includes a first groove step 12124 and a second groove step 12125 located on the side of the first groove step 12124 that is close to the outer end face 123 of the pole column. Because the cross-sectional area of ​​the second groove step 12125 is larger than the cross-sectional area of ​​the first groove step 12124, the second housing groove 12120 is a stepped groove, and the connection position between the first groove step 12124 and the second groove step 12125 forms a third stepped surface 12127, thereby allowing the first cover plate 13 to be fitted into the second housing groove 12120, specifically into the second groove step 12125, and supported by the third stepped surface 12127.

[0230] In the above proposed technology, by installing the second housing groove 12120 in the shape of a stepped groove, the first cover plate 13 can be stably fitted into the groove opening position of the second housing groove 12120, thereby improving the connection stability between the first cover plate 13 and the pole column 12. Furthermore, by limiting the groove depth of the first groove step 12124, a relatively sufficient space can be provided within the second housing groove 12120 for housing the conductive part 22.

[0231] Furthermore, if the wall surface where the groove opening of the second receiving groove 12120 of the pole column 12 is formed is a guide slope 12126, the cross-sectional area of ​​the second groove step 12125 is set to gradually increase along the direction approaching the outer end surface 123 of the pole column, so that the side wall of the second groove step 12125 forms the guide slope 12126, thereby facilitating processing and easily and effectively meeting the guide requirements.

[0232] Referring again to Figures 27 to 29, in the embodiment of the present invention, stress relief grooves 133 may be further provided in the first cover plate 13 as needed, and the stress relief grooves 133 are located in the outer peripheral region of the first cover plate 13 to assist in stress relief of the first cover plate 13. In the above technical proposal, by providing stress relief grooves 133 in the first cover plate 13, the first cover plate 13 can release stress generated during its own manufacturing process or during the electrical connection process between the first cover plate 13 and the pole column 12, thereby improving related 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 housing groove 12120 and welded, the stress relief groove 133 releases the stress generated during welding, improves lateral heat conduction, and reduces the probability of the first cover plate 13 being damaged or deformed. At the same time, if the first cover plate 13 is a composite form including the first conductive member 131 and the second conductive member 132, by installing the stress relief groove 133 on the first conductive member 131 and positioning it in the outer peripheral region of the second conductive member 132, when the first conductive member 131 is fitted into the second housing groove 12120 and welded, the stress relief groove 133 releases the stress generated during welding, improves lateral heat conduction, and reduces the probability of the second conductive member 132 being damaged or deformed. Furthermore, when the second conductive member 132 and the first conductive member 131 are fitted together and welded, the stress relief groove 133 releases the stress generated during welding, improving lateral heat conduction and reducing the probability of deformation of the first conductive member 131 or the inability to fit the first conductive member 131 into the second housing groove 12120.

[0234] Referring to Figures 30 to 31, in the embodiment of the present invention, the battery cell 10 may also be fitted with a second cover plate 14 as needed, the second cover plate 14 being fitted to the outside of the through hole 12130 and simultaneously located outside the conductive portion 22 of the second housing groove 12120.

[0235] It should be explained that when the battery cell 10 includes a second cover plate 14, the battery cell 10 may also include a first cover plate 13, or it may not include a first cover plate 13. Furthermore, the battery cell 1 0 If the system includes both the second cover plate 14 and the first cover plate 13, the first cover plate 13 may be a composite form using multiple types of materials, or it may be a non-composite form using the same material.

[0236] In the above proposed technology, at least a portion of the conductive portion 22 is located within the second housing groove 12120, the second cover plate 14 covers the conductive portion 22, and the second cover plate 14 further covers the through hole 12130. This improves the problem of electrolyte overflowing from the electrode column 12 when the electrolyte enters the second housing groove 12120 from the through hole 12130, thereby improving the reliability of the battery cell 10.

[0237] For example, as shown in Figures 30 to 31, when a portion of the conductive part 22 is sandwiched between the second cover plate 14 and the second end wall 12121, a laser welding method can be used to weld the portion of the conductive part 22, the second cover plate 14, and the second end wall 12121 together, thereby improving the reliability of the connection between the pole 12 and the conductive part 22. Furthermore, since the second cover plate 14 can press against the conductive part 22, the stability of the conductive part 22 being housed in the second housing groove 12120 can be improved by the second cover plate 14.

[0238] Referring to Figure 32, which is an assembly diagram of a battery cell 10 according to several embodiments of the present application, there is one opening 1110 on the casing body 111, 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. If the opening 1110 is located in the bottom wall of the casing body 111, all the remaining walls are sealed, and the battery core assembly 2, which includes the support 3 and 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 its predetermined position within 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, reducing the risk of battery core assembly 2 failure due to exposure, and at the same time reducing the risk of corrosion of the casing 11, thereby improving the reliability and stability of the battery cell 10.

[0240] In the above proposed technology, one 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, which includes the support 3 and the insulating member 4, can be installed into the casing body 111 only through the opening 1110, and since there is only one installation direction, it is advantageous for improving installation efficiency. Furthermore, the casing 11 does not rub against the edge of the insulating member 4, nor does it rub against 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, reduces the risk of the insulating member 4 falling off, and consequently reduces the risk of corrosion of the casing 11 due to exposure of the battery core assembly 2, reduces the failure list of the battery core assembly 2 itself, reduces the risk of leakage, and further improves the reliability and stability of the battery cell 10.

[0241] Selectively, all poles 12 may be provided on the casing cover 112, that is, all poles 12 may be located on the side away from the support 3 of the battery core assembly 2, and the conductive portion 22 may be electrically connected to the poles 12 on the casing cover 112.

[0242] Selectively, one of the pole posts 12 may be provided on the casing cover 112, and the other pole post 12 may be provided on the end wall of the casing body 111 facing the opening 1110, and one of the conductive parts 22 may be electrically connected from the pole post 12 on the casing cover 112.

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

[0244] Referring again to Figure 32, the casing body 111 has a mounting wall 1112 facing the opening 1110, and at least one pole 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 part 22 faces the pole post 12 directly, so the conductive part 22 can be connected to the pole post 12 relatively easily, improving the assembly efficiency of the battery cell 10.

[0245] Exemplary, 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, the casing cover 112 is provided at the bottom of the casing body 111, the battery core assembly 2 can be installed inside the casing body 111 from bottom to top along the Z direction, and the conductive part 22 can be easily connected to the pole column 12.

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

[0247] In the above proposed technology, 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, which includes the two supports 3 and insulating members 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 the needs. After the battery core assembly 2 is installed in a predetermined position within the casing body 111, a portion of the insulating member 4 may be pressed between the wall of the casing body 111 facing one of the openings 1110 and the corresponding support 3, and the other portion of the insulating member 4 may be pressed between the wall of the casing body 111 facing the other opening 1110 and the corresponding support 3. This further reduces the risk of the insulating member 4 falling off, reduces the risk of failure of the battery core assembly 2 due to exposure, and at the same time reduces the risk of corrosion of the casing 11, improving the reliability and stability of the battery cell 10.

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

[0249] When two openings 1110 are provided in two opposing walls of the casing body 111, the remaining walls are all sealed structures, one of which 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 pole columns 12 may be provided in the first casing cover 1121, or all pole columns 12 may be provided in the second casing cover 1122, or some pole columns 12 may be provided in the first casing cover 1121 or the second casing cover 1122 and the other pole columns 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 pole post 12, and each end of the battery core assembly 2 is provided with one support 3, and the battery core assembly 2 equipped with the support 3 and insulating member 4 can be installed into the casing body 111 through any opening 1110, and 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, and after the battery core assembly 2 equipped with the two support 3 is installed in the casing, one conductive part 22 of it passes through one support 3 and is electrically connected to the pole post 12 on the first casing cover 1121, and the other conductive part 22 of it passes through the other support 3 and is electrically connected to the pole post 12 on the second casing cover 1122.

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

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

[0253] In the embodiment of the present invention, the battery cell 10 is a rectangular parallelepiped, the height direction of the battery cell 10 is the first direction Z, the length direction of the battery cell 10 is the second direction X, and the thickness direction of the battery cell 10 is 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 annular structure, one end of the casing body 111 is open along the first direction Z and the other end of the casing body 111 is sealed along the first direction Z, and the casing cover 112 is installed to cover the open position of the casing body 111. Two poles 12 are provided at the sealed end of the casing body 111 along the first direction Z, the two poles 12 are separated along the second direction X and are a positive pole and a negative pole, respectively.

[0254] Each of the two pole columns 12 is equipped with a housing section 121, and the housing section 121 includes a second housing groove 12120, specifically, very Column 12 includes a second end wall 12121 and a second side wall 12123, the second end wall 12121 being located on the side of the second side wall 12123 adjacent to the casing cover 112, and the second end wall 12121 and the second side wall 12123 surrounding each other to form a second accommodating groove 12120. very The surface of the column 12 away from the casing cover 112 is the outer end face 123 of the pole column, the opening of the second housing groove 12120 is formed on the outer end face 123 of the pole column, and a through hole 12130 is provided 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 coated portion 21 and a conductive portion 22, the active material coated portion 21 being housed in a casing 11, the support 3 being provided at one end of the active material coated portion 21 and positioned between the sealing end of the casing body 111 and the active material coated portion 21 along a first direction Z, the support 3 having two through holes 311, the two through holes 311 being separated along a second direction X.

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

[0257] In the invention of this embodiment, an independent support 3 is used to replace the plastic member embedded under the top cover in the related technology. The support 3 is fitted into the battery core assembly 2 and then attached together to the casing. In the process of installing the battery core assembly 2 with the support 3 into the casing 11, the support 3 can restrain the active material coated portion 21. In addition, the extended portion 37 protects the active material coated portion 21, reducing the probability of the active material coated portion 21 coming into contact with the casing 11. This minimizes the occurrence of the casing 11 damaging the active material coated portion 21, thereby improving the reliability of the battery cell 10. Furthermore, the installation steps are simple, which is advantageous for improving production efficiency.

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

[0259] In the above-described technical proposal, since the battery cell 10 is installed in the battery 100, the support 3 can restrain the active material coated portion 21. In addition, the extended portion 37 protects the active material coated portion 21, reduces the probability of the active material coated portion 21 coming into contact with the casing 11, minimizes the occurrence of the casing 11 damaging the active material coated portion 21, improves the reliability of the battery 100, and is advantageous for improving production efficiency due to its simple installation steps.

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

[0261] In the above proposed technology, the battery 100 is installed in the electrical device 1000, which improves the reliability and stability of the battery 100's operation. Therefore, the reliability and stability of the electrical device 1000's operation can be improved. If the electrical device 1000 is a vehicle, the battery 100's usage time will be improved, which is advantageous for extending the vehicle's driving range.

[0262] The electrical device 1000 may be any of the aforementioned equipment or systems that use the battery 100.

[0263] As long as there is no contradiction, the embodiments and features of the embodiments of this application can be combined with each other.

[0264] The foregoing are merely preferred embodiments of the present application and do not limit it, and various modifications and changes are possible for those skilled in the art. Any modifications, equivalent substitutions, and improvements made without departing from the spirit and principles of the present application are also included in the claims.

Claims

1. A battery cell (10), A casing (11) comprising a casing cover (112) and a casing body (111) having an opening (1110), wherein the casing cover (112) covers the opening (1110), A battery core assembly (2) including an active material coating section (21) provided within the casing (11), The active material coating portion (21) includes a support (3) which is installed at one end away from the opening (1110) and fitted into the battery core assembly (2), Here, the support (3) has a main body (36) and an extended portion (37) provided on the peripheral edge side of the main body (36), the projection of the main body (36) onto the plane of the casing cover (112) is located within the projection of the active material coated portion (21) onto the plane of the casing cover (112), and the projection of the extended portion (37) onto the plane of the casing cover (112) is located outside the projection of the active material coated portion (21) onto the plane of the casing cover (112). The casing (11) is provided with pole posts (12), and the battery core assembly (2) further includes a conductive portion (22), the conductive portion (22) is connected to the side of the active material coated portion (21) that is close to the main body portion (36), the main body portion (36) has a through hole (311), and the conductive portion (22) is connected to the pole post (12) by passing through the through hole (311). On the side of the main body (36) that is separated from the active material coated portion (21), a accommodating groove (393) communicating with the through hole (311) is provided, and the accommodating groove (393) is used to accommodate at least a portion of the pole column (12). Battery cell (10).

2. The battery cell (10) according to claim 1, wherein the extended portion (37) is located on both sides facing each other along a predetermined direction of the main body (36), 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 extended portion (37) is an annular structure surrounding the main body portion (36).

4. The battery cell (10) according to claim 1, wherein the edge of the surface of the extended 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 claim 1, wherein the support (3) is engaged with or bonded to the battery core assembly (2).

6. A position-restricting projection (38) is provided on the side of the extended portion (37) that is close to the casing cover (112), and the support (3) is engaged with the active material coated portion (21) via the position-restricting projection (38), as described in claim 1, for the battery cell (10).

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

8. The aforementioned battery cell (10) is The insulating member (4) further includes the active material coated portion (21) and is connected to the extended portion (37), The battery cell (10) according to claim 1.

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

10. The battery cell (10) according to claim 9, wherein the peripheral wall surface (370) has a first stepped surface (371) and a second stepped surface (372), the second stepped surface (372) is located on the side of the first stepped surface (371) that is closer to the casing cover (112), the second stepped surface (372) is closer to the active material coated portion (21) than the first stepped surface (371), and the insulating member (4) is connected to the second stepped surface (372).

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

12. The aforementioned battery cell (10) is The insulating member (4) further includes the active material coated portion (21) and is connected to the surface of the main body (36) that is away from the casing cover (112), The battery cell (10) according to claim 1.

13. The battery cell (10) according to claim 1, wherein the support (3) is a single-piece structure, or the support (3) comprises a separate structure and separately molded first support (33) and second support (34), the through-hole (311) is defined between the first support (33) and the second support (34).

14. A positioning portion (32) is provided on the side of the main body portion (36) that is separated from the active material coated portion (21), the positioning portion (32) is provided circumferentially in the circumferential direction of the through hole (311) and extends in a direction approaching the pole column (12), and the positioning portion (32) positions and attaches the support (3) and the pole column (12), as described in claim 1.

15. The battery cell (10) according to claim 14, wherein the pole column (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).

16. A guide groove (312) communicating with the through hole (311) is formed on the side of the main body (36) facing the active material coating 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 the direction of the main body (36) approaching the active material coating portion (21), as described in claim 1, the battery cell (10).

17. The battery cell (10) according to claim 16, wherein the support (3) has at least one first liquid injection guide groove (392), the first liquid injection guide groove (392) is located on the side of the support (3) toward the active material coating portion (21), and at least one of the first liquid injection guide grooves (392) communicates with the guide groove (312).

18. The battery cell (10) according to claim 1, wherein the support (3) has a first liquid injection guide groove (392), the first liquid injection guide groove (392) is located on the side of the support (3) facing the active material coating portion (21), and / or the support (3) has a second liquid injection guide groove, the second liquid injection guide groove is located on the side of the support (3) facing away from the active material coating portion (21).

19. The battery cell (10) according to claim 1, wherein the support (3) has a relief portion (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).

20. The battery core assembly (2) further includes a conductive portion (22), the conductive portion (22) being connected to the side of the active material coated portion (21) that is close to the main body portion (36), The battery cell (10) according to claim 1, wherein the casing (11) is provided with poles (12), the poles (12) are provided with housings (121), and at least a portion of the conductive portion (22) is housed in the housings (121) and connected to the poles (12).

21. The battery cell (10) according to claim 20, wherein the housing portion (121) has a first housing groove (12110), the surface of the pole column (12) facing the active material coated portion (21) is the inner end face (122) of the pole column, the groove opening of the first housing groove (12110) is formed on the inner end face (122) of the pole column, and at least a part of the conductive portion (22) is housed in the first housing groove (12110).

22. The battery cell (10) according to claim 20, wherein the housing portion (121) has a second housing groove (12120), the surface of the pole column (12) away from the active material coated portion (21) is the outer end surface (123) of the pole column, the groove opening of the second housing groove (12120) is formed on the outer end surface (123) of the pole column, the second housing groove (12120) communicates with 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 housed in the second housing groove (12120).

23. The battery cell (10) according to claim 1, wherein there are two openings (1110), each of which is provided with one casing cover (112), and the support (3) is installed at one end of the active material coating portion (21) away from any of the openings (1110).

24. The battery cell (10) according to claim 1, wherein at least one pole column (12) is installed on the casing wall of the casing (11) adjacent to the support (3).

25. A battery (100) comprising a battery cell (10) according to any one of claims 1 to 24.

26. An electrical device (1000) comprising a battery (100) as described in claim 25.

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