Battery monomer, battery and electric device

Abstract

The invention discloses a battery monomer, a battery and a power utilization device. The battery cell includes: a case including a case cover and a case body; the battery core assembly comprises an active material coating part; the bracket is arranged at one end, far away from the opening of the shell body, of the active substance coating part and is matched with the battery core assembly; the support is provided with a main body part and an extension part arranged on the peripheral side of the main body part, the projection of the main body part on the plane of the shell cover is located in the projection of the active substance coating part on the plane of the shell cover, and the projection of the extension part on the plane of the shell cover is located outside the projection of the active substance coating part on the plane of the shell cover. According to the technical scheme, the probability that the active substance coating part touches the shell can be reduced, and the phenomenon that the active substance coating part is scratched by the shell is reduced.

Description

Battery cells, batteries and electrical devices Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become a crucial component of this sustainable development. Battery technology is a crucial factor in the development of electric vehicles. Improving the reliability of battery cells is a pressing issue in related technologies.

[0003] Summary of the Invention

[0004] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, wherein the bracket of the battery cell can improve the reliability of the battery cell.

[0005] In the first aspect, the present application provides a battery cell, comprising: a shell, comprising a shell cover and a shell body having an opening, the shell cover covering the opening; a battery cell assembly, comprising an active material coating portion, the active material coating portion being arranged in the shell; a bracket, arranged at an end of the active material coating portion away from the opening, and cooperating with the battery cell assembly; wherein the bracket has a main body and an extension portion arranged on the peripheral side of the main body, the projection of the main body on the shell cover plane is located inside the projection of the active material coating portion on the shell cover plane, and the projection of the extension portion on the shell cover plane is located outside the projection of the active material coating portion on the shell cover plane.

[0006] In the technical solution of the embodiment of the present application, the bracket is set at the end of the active material coating part away from the opening, and the projection of the main body on the shell cover plane is set within the projection of the active material coating part on the shell cover plane. Then, they are put into the shell together. In the process of installing the battery cell assembly with the bracket into the shell, the bracket will preferentially contact the shell body, to a certain extent preventing the end of the shell body near the opening from directly contacting the active material coating part, thereby minimizing the occurrence of the shell scratching the active material coating part; the projection of the extension on the shell cover plane is set outside the projection of the active material coating part on the shell cover plane, which can protect the active material coating part during the shell insertion process, reduce the probability of the active material coating part touching the shell, and further reduce the occurrence of the shell scratching the active material coating part. In addition, by setting the bracket to reduce the occurrence of the shell scratching the active material coating part, the possibility of the active material falling off is reduced, to a certain extent, the internal short circuit caused by the overlapping of the fallen active material and the pole piece of the opposite polarity is prevented, and to a certain extent, the chemical reaction of the fallen active material with the shell is prevented, thereby causing the shell to be corroded and penetrated, thereby improving the reliability of the battery cell.

[0007] In some embodiments, the extension portion is located on opposite sides of the main body along a preset direction, and the preset direction is parallel to the shell cover plane, which can prevent the opposite side edges of the active material coating portion from touching the shell, thereby preventing the shell from scratching the opposite side edges of the active material coating portion.

[0008] In some embodiments, the extension portion is an annular structure surrounding the main body. The bracket can protect the outer edge of one end of the active material coating portion, preventing the outer edge of the active material coating portion facing the bracket from contacting the housing, thereby preventing the housing from scratching the active material coating portion and further improving the reliability of the battery cell.

[0009] In some embodiments, the edge of the extension portion facing away from the housing cover has a guide surface, which includes an arc surface and / or an inclined surface. The guide surface can play a guiding role, allowing the bracket to be smoothly installed into the housing body, thereby improving assembly efficiency.

[0010] In some embodiments, the bracket is snapped or bonded to the battery cell assembly to connect the bracket and the battery cell assembly together, which to a certain extent prevents the bracket from falling off before entering the shell, thereby improving the product quality rate of the battery monomer; the bracket and the battery cell assembly can be entered into the shell together, which can not only protect the battery cell assembly and ensure that the battery cell assembly can be smoothly and safely entered into the shell, but also play an insulating role.

[0011] In some embodiments, a retaining projection is provided on the side of the extension portion proximal to the housing cover, and the bracket engages with the active material coating portion via the retaining projection. This arrangement constrains one end of the active material coating portion, reducing the likelihood of the outer layer of the active material coating portion becoming fluffy. It also protects the one end of the active material coating portion, reducing the risk of the active material coating portion contacting the housing, thereby reducing the risk of the housing scratching the active material coating portion. The retaining projection, which engages the active material coating portion, prevents the bracket from falling off before insertion into the housing, thereby improving the quality of the battery cell.

[0012] In some embodiments, the surface of the retaining projection facing the active material coating portion includes: a first surface, which is in contact with the sidewall of the active material coating portion; and / or a second surface, the distance between the second surface and the active material coating portion gradually increasing along the direction from the bracket toward the opening. The first and second surfaces can constrain the battery cell assembly to reduce the likelihood of the outer layer of the battery cell assembly becoming fluffy, and also provide protection for the sidewall of the battery cell assembly, reducing the risk of one end of the battery cell assembly contacting the housing. The second surface can serve as a guide to facilitate assembly and improve the efficiency of assembling the battery cell assembly and the bracket.

[0013] In some embodiments, the battery cell further comprises an insulating member that wraps around the active material coating portion and is connected to the extension portion. The insulating member, located between the active material coating portion and the housing, provides insulation and protects the cell assembly, preventing overlap between the cell assembly and the battery cell housing, effectively reducing corrosion of the cell assembly due to leakage. Connecting the insulating member to the extension portion facilitates securing the insulating member.

[0014] In some embodiments, the insulating member is connected to the peripheral wall surface of the extension portion, which can improve the connection reliability between the insulating member and the peripheral wall of the bracket and reduce the risk of the insulating member falling off.

[0015] In some embodiments, the peripheral wall surface includes a first stepped surface and a second stepped surface, the second stepped surface being located on a side of the first stepped surface closer to the housing cover, the second stepped surface being closer to the active material coating portion than the first stepped surface, and the insulating member being connected to the second stepped surface. In the above technical solution, configuring the peripheral wall surface to include the first and second stepped surfaces provides mounting space for the insulating member. Connecting the insulating member to the second stepped surface reduces the risk of the connection structure between the insulating member and the second stepped surface becoming detached due to scratching the housing, further improving the reliability of the connection between the insulating member and the bracket.

[0016] In some embodiments, the first stepped surface is further away from the active material coating portion than the outer side surface of the insulating member. The first stepped surface can protect the edges of the insulating member and the active material coating portion, reducing the occurrence of scraping of the insulating member and the active material coating portion against the inner wall of the housing. It can also protect the connection 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 falling off due to scraping against the housing, further improving the reliability of the connection between the insulating member and the bracket.

[0017] In some embodiments, the battery cell further comprises: an insulating member, the insulating member wrapping around the active material coating portion and connected to the surface of the main body away from the shell cover. On the one hand, when the battery cell assembly with the bracket is installed into the shell, the shell will not scratch the edge of the insulating member, nor will it scratch the connection position between the insulating member and the main body, and the connection position between the two is not easily pulled apart during the shell insertion process, which can reduce the movement and slippage of the insulating member during the shell insertion process of the battery cell assembly, improve the connection reliability between the insulating member and the bracket, reduce the risk of the insulating member falling off, and further reduce the risk of the shell being corroded due to leakage of the battery cell assembly, reduce the risk of the battery cell assembly itself failing, and reduce the risk of leakage, thereby improving the reliability and stability of the battery cell; in addition, connecting at least a portion of the insulating member to the wall of the main body away from the battery cell assembly can also design the size of the insulating member to be longer, so that it can be used for battery cell assemblies of different sizes, have higher compatibility, and improve manufacturability. On the other hand, after the bracket and battery cell assembly are installed in place in the shell, the insulating part is pressed between the wall of the shell opposite to the opening and the main body, which can further reduce the risk of the insulating part falling off, reduce the risk of the battery cell assembly failing due to leakage, and at the same time reduce the risk of corrosion of the shell, thereby improving the reliability and stability of the battery cell.

[0018] In some embodiments, the shell is provided with a pole; the shell is provided with a pole; the battery cell assembly further includes a conductive portion, the conductive portion is connected to the side of the active material coating portion near the main body, and the main body has a via hole, through which the conductive portion passes to connect with the pole. In the above technical solution, on the one hand, by providing a via hole in the main body, the bracket can play the role of collecting and accommodating the conductive portion, facilitating the connection between the conductive portion and the pole, which can improve the assembly reliability and convenience of the battery cell; on the other hand, the bracket collects the conductive portion, eliminating the structure of the original plastic parts in the battery cell. The bracket and the insulating part can achieve insulation between the entire active material coating portion and the shell through the cooperation, which can effectively reduce manufacturing and production costs.

[0019] In some embodiments, the bracket is a one-piece structure; alternatively, the bracket is a split structure and includes a first bracket and a second bracket formed separately, with a through hole defined between the first bracket and the second bracket. A bracket with an one-piece structure is easy to process, has better reliability, and facilitates assembly of the bracket with the housing assembly, improving assembly efficiency and mating stability. The through hole is defined by the cooperation of the first bracket and the second bracket. When assembling the bracket with the battery cell assembly, there is no need to pass the conductive part from one end of the through hole to the other end. Instead, the first bracket and the second bracket can be spliced ​​together at the position of the conductive part to clamp the conductive part, so that the through hole surrounds the conductive part, facilitating assembly of the bracket with the battery cell assembly and improving assembly efficiency.

[0020] In some embodiments, a receiving groove, connected to the via hole, is provided on the side of the main body facing away from the active material coating portion. The receiving groove is used to accommodate at least a portion of the terminal. In this technical solution, on the one hand, accommodating at least a portion of the terminal in the receiving groove makes the entire battery cell structure more compact and reliable, thereby facilitating an increase in the energy density of the entire battery. On the other hand, the provision of the receiving groove also allows the terminal to be partially insulated from the housing via the bracket, further improving the stability and reliability of the battery cell.

[0021] In some embodiments, a positioning portion is provided on the side of the main body facing away from the active material coating portion. The positioning portion is circumferentially disposed around the via and extends toward the terminal. The positioning portion can constrain, gather, and support the conductive portion, facilitating connection between the conductive portion and the terminal, thereby improving battery cell assembly efficiency and quality.

[0022] In some embodiments, a receiving portion is provided on the pole, at least a portion of the conductive portion is received in the receiving portion, and at least a portion of the positioning portion extends into the receiving portion and is used to guide the conductive portion to extend into the receiving portion. In the above technical solution, on the one hand, by setting the pole as a hollow structure and coordinating the positioning portion with the hollow structure, the conductive portion can be guided to connect with the pole, which can improve the connection reliability and ensure the assembly efficiency and quality; on the other hand, the conductive portion can be received in the receiving portion, which improves the assembly efficiency of the conductive portion, saves the space occupied by the conductive portion, and makes full use of the space of the battery cell, so that the cooperation between the bracket and the pole, and between the bracket and the conductive portion are tighter and more reliable, making the structure of the battery cell more compact, which is more conducive to improving the energy density of the battery cell.

[0023] In some embodiments, a guide groove, communicating with the via, is formed on one side of the main body facing the active material coating. The guide groove accommodates at least a portion of the conductive portion, and the cross-sectional area of ​​the guide groove gradually increases as the main body approaches the active material coating. The guide groove accommodates the conductive portion while also providing a clearance to prevent it from being crushed. It also reduces the likelihood of the conductive portion becoming puffy or folded, thereby reducing redundancy.

[0024] In some embodiments, the bracket includes at least one first liquid injection guide groove, located on a side of the bracket facing the active material coating portion, and at least one first liquid injection guide groove communicates with the guide groove. During injection, the electrolyte can flow along the first liquid injection guide groove and toward the guide groove, allowing the electrolyte to flow to a predetermined location, thereby increasing the contact area between the electrolyte and the active material coating portion. The provision of the first liquid injection guide groove increases the contact area between the electrolyte and the active material coating portion, thereby reducing the problem of poor wetting of the active material coating portion.

[0025] In some embodiments, the support includes a first liquid injection channel located on the side of the support facing the active material coating portion; and / or a second liquid injection channel located on the side of the support facing away from the active material coating portion. During injection, the electrolyte can flow along the first and / or second liquid injection channels, providing an infiltration path for the electrolyte, increasing electrolyte fluidity, speeding up injection, and reducing formation standstill time.

[0026] In some embodiments, the side of the bracket facing the battery cell assembly has a clearance portion for avoiding the outer edge of the battery cell assembly facing the bracket. By providing the clearance portion, the rounded corner structure between the limiting protrusion and the main body can be eliminated, preventing the rounded corner structure from crushing the outer edge of the battery cell assembly.

[0027] In some embodiments, the battery cell assembly further includes a conductive portion, which is connected to a side of the active material coating portion near the main body; a pole is provided on the housing, and a receiving portion is provided on the pole, and at least a portion of the conductive portion is received within the receiving portion and connected to the pole. By receiving at least a portion of the conductive portion within the receiving portion, the space occupied by the battery cell itself can be reduced, allowing a battery of the same volume to accommodate a larger number of battery cells and improving the volumetric energy density of the battery; in addition, by receiving at least a portion of the conductive portion within the receiving portion to occupy space within the pole, the redundancy of the conductive portion within the housing can be reduced to at least a certain extent, reducing the probability of short circuit between the conductive portion and the active material coating portion, reducing the probability of short circuit in the battery cell, and improving the operating reliability and stability of the battery cell and the battery.

[0028] In some embodiments, the accommodating portion has a first accommodating groove, the surface of the pole facing the active material coating portion is the inner end face of the pole, the notch of the first accommodating groove is formed on the inner end face of the pole, and at least part of the conductive portion is accommodated in the first accommodating groove. In the above technical solution, on the one hand, the opening of the first accommodating groove on the pole can reduce the weight of the pole to a certain extent, so as to improve the weight energy density of the battery cell and the battery; on the other hand, because the notch of the first accommodating groove is formed on the inner end face of the pole, and the inner end face of the pole is the surface of the pole close to the active material coating portion, the first accommodating groove can be opened in the direction of the active material coating portion, thereby facilitating the conductive portion to extend into the first accommodating groove, thereby improving assembly efficiency. Moreover, this form of first accommodating groove is easy to process and improves production efficiency.

[0029] In some embodiments, the receiving portion includes a second receiving groove, wherein the surface of the terminal distal to the active material coating portion is the terminal outer end surface, and a notch of the second receiving groove is formed on the terminal outer end surface. The second receiving groove communicates with the interior of the housing via a through-hole, and the conductive portion is passed through the through-hole and at least partially received within the second receiving groove. In the above technical solution, on the one hand, the provision of the second receiving groove on the terminal can reduce the weight of the terminal to a certain extent, thereby improving the weight energy density of the battery cell and the battery. On the other hand, because the notch of the second receiving groove is formed on the terminal outer end surface, which is the surface of the terminal distal to the active material coating portion, the second receiving groove can be open in a direction away from the active material coating portion. Thus, when at least a portion of the conductive portion is received within the second receiving groove, the conductive portion can be easily stored and organized through the notch of the second receiving groove, and electrical connection operations between the conductive portion and the terminal can be easily performed through the notch of the second receiving groove, thereby reducing the difficulty of battery cell production and improving battery cell production efficiency.

[0030] In some embodiments, there are two openings, each of which is provided with a shell cover, and a bracket is provided at the end of the active material coating portion away from any one of the openings. In the above technical solution, two openings are provided on the shell body, and a bracket is provided at the end of the battery cell assembly away from any one of the openings. The battery cell assembly with two brackets and an insulating member can be loaded into the shell body from any one of the openings, and a suitable shell insertion direction can be selected as needed. After the battery cell assembly is installed in place in the shell body, a portion of the insulating member can be pressed between the wall of the shell body opposite to one of the openings and the corresponding bracket, and another portion of the insulating member can be pressed between the wall of the shell body opposite to the other opening and the corresponding bracket, further reducing the risk of the insulating member falling off, reducing the risk of the battery cell assembly failing due to leakage, and at the same time reducing the risk of the shell being corroded, thereby improving the reliability and stability of the battery cell.

[0031] In some embodiments, at least one terminal is disposed on the housing wall adjacent to the bracket. The battery cell assembly, including the bracket and insulator, is inserted into the housing through the opening, with the conductive portion directly facing the terminal. This facilitates connection between the conductive portion and the terminal, improving battery cell assembly efficiency.

[0032] In a second aspect, the present application provides a battery comprising the battery cell in the above embodiment.

[0033] In the above technical solution, since the battery is provided with the above-mentioned battery cell, the bracket can not only constrain the active material coating portion, but also the extension portion can protect the active material coating portion, reduce the probability of the active material coating portion touching the shell, and minimize the occurrence of the shell scratching the active material coating portion, thereby improving the reliability of the battery. In addition, the installation steps are simple, which is conducive to improving production efficiency.

[0034] In a third aspect, the present application provides an electrical device comprising the battery of the above embodiment. In the above technical solution, since the electrical device is provided with the above battery, the reliability and stability of the battery can be improved, which can also improve the reliability and stability of the electrical device.

[0035] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0037] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0038] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0039] FIG3 is a battery provided by some embodiments of the present application;

[0040] FIG4 is an exploded view of the structure of a battery cell according to some embodiments of the present application;

[0041] FIG5 is a cross-sectional view of the structure of a battery cell according to some embodiments of the present application;

[0042] FIG6 is an enlarged view of the battery cell at position A shown in FIG5 ;

[0043] FIG7 is a front view of a battery cell according to some embodiments of the present application;

[0044] FIG8 is a front view of a battery cell according to some other embodiments of the present application;

[0045] FIG9 is a partial structural cross-sectional view of a battery cell according to some embodiments of the present application;

[0046] FIG10 is a partial structural cross-sectional view of a battery cell according to some other embodiments of the present application;

[0047] FIG11 is a partial structural cross-sectional view of a battery cell according to some other embodiments of the present application;

[0048] FIG12 is a partial structural cross-sectional view of a battery cell according to some further embodiments of the present application;

[0049] FIG13 is a cross-sectional view of the structure of a battery cell assembly, a bracket, and an insulating member after assembly in some embodiments of the present application;

[0050] FIG14 is an enlarged view of the battery cell at position B shown in FIG13;

[0051] FIG15 is a cross-sectional view of the structure of a battery cell assembly, a bracket, and an insulating member after assembly in accordance with other embodiments of the present application;

[0052] FIG16 is a schematic structural diagram of a battery cell bracket according to some embodiments of the present application;

[0053] FIG17 is a schematic structural diagram of a bracket for a battery cell according to some other embodiments of the present application;

[0054] FIG18 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0055] FIG19 is a cross-sectional view of a structure of a bracket of a battery cell according to some embodiments of the present application;

[0056] FIG20 is a top view of a bracket of a battery cell according to some embodiments of the present application;

[0057] FIG21 is a top view of a bracket for a battery cell according to some other embodiments of the present application;

[0058] FIG22 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0059] FIG23 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0060] FIG24 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0061] FIG25 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0062] FIG26 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0063] FIG27 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0064] FIG28 is an exploded view of the structure of the battery cell shown in FIG27;

[0065] FIG29 is an exploded view of the structure of the first cover plate shown in FIG28;

[0066] FIG30 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0067] FIG31 is an exploded view of the structure of the battery cell shown in FIG30 ;

[0068] FIG32 is an assembly diagram of a battery cell according to some embodiments of the present application;

[0069] FIG33 is an assembly diagram of battery cells according to other embodiments of the present application.

[0070] Reference numerals: Electric device 1000, battery 100, controller 200, motor 300, first direction Z, second direction X, third direction Y, axial direction R of pole, battery cell 10, housing 20, first housing 201, second housing 202, housing 11, housing body 111, opening 1110, mounting wall 1112, housing cover 112, first housing cover 1121, second housing cover 1122, mounting hole 113, Pole 12, accommodating portion 121, first accommodating groove 12110, first end wall 12111, first recessed groove 12112, first side wall 12113, second accommodating groove 12120, second end wall 12121, second recessed groove 12122, second side wall 12123, first groove section 12124, second groove section 12125, guiding inclined surface 12126, third step surface 12127, through-hole 12130, pole inner end surface 122, pole outer end surface 123, first groove 126, spacer 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 cell assembly 2, first end 201, second end 202, active material coating portion 21, conductive portion 22, Bracket 3, through hole 311, guide groove 312, positioning portion 32, first bracket 33, second bracket 34, guide surface 35, main body 36, extension portion 37, peripheral wall surface 370, first step surface 371, second step surface 372, limiting protrusion 38, first surface 381, second surface 382, ​​air avoidance portion 391, first liquid injection guide groove 392, accommodating groove 393, insulating member 4, connection mark 401, slot cover 7. DETAILED DESCRIPTION

[0071] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0072] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0073] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0074] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0075] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0076] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0077] The term "plurality" used in this application refers to two or more (including two).

[0078] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0079] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0080] The battery mentioned in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application can be a battery module or a battery pack. A battery module generally includes multiple battery cells. A battery pack generally includes a casing and one or more battery cells disposed in the casing, or a battery pack includes a casing and one or more battery modules disposed in the casing. The casing can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0081] For example, a battery cell typically includes a housing, an electrode assembly, and an electrolyte. The housing is used to house the electrode assembly and electrolyte, and is provided with at least one positive electrode post and at least one negative electrode post. The electrode assembly is formed by stacking or winding a positive electrode sheet, a negative electrode sheet, and a separator.

[0082] Among them, the positive electrode sheet generally includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is directly or indirectly coated on the positive electrode current collector. The positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer. The positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab. Multiple positive electrode tabs are stacked together and electrically connected to the positive electrode column. The negative electrode sheet generally includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is directly or indirectly coated on the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. Multiple negative electrode tabs are stacked together and electrically connected to the negative electrode column. The material of the separator is not limited and can be, for example, polypropylene or polyethylene.

[0083] At the same time, battery cells primarily rely on the movement of metal ions between the positive and negative electrodes to operate. Taking lithium-ion batteries as an example, the positive electrode current collector can be made of aluminum, the positive electrode active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode current collector can be made of copper, and the negative electrode active material layer can be made of carbon or silicon, etc. During the charge and discharge process, Li+ is intercalated and deintercalated back and forth between the two electrodes: during charging, Li+ is deintercalated from the positive electrode and intercalated into the negative electrode through the electrolyte, leaving the negative electrode in a lithium-rich state; during discharge, the opposite occurs.

[0084] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0085] In related art battery cells, during manufacturing, an active material layer is coated on a current collector and then cut to obtain a pole piece consisting of a current collector coated with an active material layer (referred to as the active material coating portion) and a current collector not coated with an active material layer (referred to as a tab piece). The positive and negative pole pieces and the separator are then stacked or wound in sequence to obtain an electrode assembly. In the electrode assembly, multiple tabs are stacked to form a tab portion. The tab portion itself forms a conductive portion, or the tab portion is connected to a transition piece to form a conductive portion. The active material coating portion and the conductive portion form a cell assembly. The battery cell's shell cover is provided with a pole post. During assembly, the battery cell is typically welded to the pole post on the shell cover before being inserted into the shell through the opening in the shell body.

[0086] However, the inventors found that in the process of installing the battery cell assembly into the shell through the opening, the insulating parts and the battery cell assembly (especially the edges of the battery cell assembly) are likely to interfere with or scratch the shell, causing damage to the insulating parts and the pole pieces of the battery cell assembly, thereby causing the active material to fall off, which may cause the active material to overlap with the pole pieces of opposite polarity and cause an internal short circuit; and the insulating parts are prone to wrinkles during the friction with the shell, causing contact between the battery cell assembly and the inner wall surface of the shell, causing corrosion of the battery cell assembly, and affecting the reliability of the battery cell.

[0087] In order to reduce the occurrence of the shell scratching the battery cell assembly, the present application sets the bracket at the end of the active material coating part away from the opening, and the projection of the main body on the shell cover plane is set within the projection of the active material coating part on the shell cover plane, and then put into the shell together. In the process of loading the battery cell assembly with the bracket into the shell, the bracket will preferentially contact the shell body, to a certain extent preventing the end of the shell body close to the opening from directly contacting the active material coating part, thereby reducing the occurrence of the shell scratching the active material coating part as much as possible; the projection of the extension part on the shell cover plane is set outside the projection of the active material coating part on the shell cover plane, which can protect the active material coating part during the shell insertion process, reduce the probability of the active material coating part touching the shell, and further reduce the occurrence of the shell scratching the active material coating part. By setting the bracket to reduce the occurrence of the shell scratching the active material coating part, the possibility of the active material falling off is reduced, and to a certain extent, the internal short circuit caused by the overlapping of the fallen active material and the pole piece of the opposite polarity is prevented, and to a certain extent, the chemical reaction of the fallen active material with the shell is prevented, which in turn causes the shell to be corroded and penetrated, thereby improving the reliability of the battery cell.

[0088] The battery cells disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, battery-powered vehicles, electric vehicles, ships, spacecraft, and the like. Electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, among others.

[0089] Taking a vehicle as an example of an electrical device in an embodiment of the present application, the structures of the battery cell, battery, and electrical device provided in the embodiment of the present application are described in detail.

[0090] Please refer to Figure 1, which is a schematic structural diagram of a vehicle in which the power-consuming device 1000 provided in some embodiments of the present application is a vehicle. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The vehicle is provided with a battery 100, and the battery 100 can be arranged at the bottom, head or tail of the vehicle. The battery 100 can be used to power the vehicle, for example, the battery 100 can be used as an operating power source for the vehicle. The vehicle may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle during driving. In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0091] Please refer to Figure 2, which is an exploded view of the structure of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 20 and a plurality of battery cells 10, with the battery cells 10 housed within the housing 20. The housing 20 is used to provide a storage space for the battery cells 10, and the housing 20 can adopt a variety of structures. In some embodiments, the housing 20 can include a first housing 201 and a second housing 202, which cover each other and together define a storage space for accommodating the battery cells 10. The second box body 202 can be a hollow structure with one end open, and the first box body 201 can be a plate-like structure. The first box body 201 covers the open side of the second box body 202, so that the first box body 201 and the second box body 202 jointly define an assembly space. Alternatively, the first box body 201 and the second box body 202 can both be hollow structures with one end open (for example, as shown in FIG. 2 ), with the open side of the first box body 201 covering the open side of the second box body 202. Of course, the box body 20 formed by the first box body 201 and the second box body 202 can be of various shapes, such as a cylinder or a rectangular parallelepiped.

[0092] In the battery 100, multiple battery cells 10 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 10. Multiple battery cells 10 can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 10 can be housed within the housing 20. Alternatively, the battery 100 can be constructed by first connecting multiple battery cells 10 in series, in parallel, or in a hybrid connection to form a battery module. The multiple battery modules are then connected in series, in parallel, or in a hybrid connection to form a single unit, which is then housed within the housing 20. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 10.

[0093] Please refer to Figure 3, which is a schematic diagram of a battery cell 10 provided in some embodiments of the present application. In the embodiments of the present application, the battery cell 10 is a rectangular parallelepiped, with the height direction of the battery cell 10 being a first direction Z, the length direction of the battery cell 10 being a second direction X, and the thickness direction of the battery cell 10 being a third direction Y. The first direction Z, the second direction X, and the third direction Y are mutually perpendicular. Of course, in other embodiments of the present application, the battery cell 10 may also be cylindrical, flat, or have other shapes, and this embodiment is not limiting.

[0094] Please refer to Figures 4 and 5. Figure 4 is an exploded view of the structure of a battery cell in some embodiments of the present application. Figure 5 is a cross-sectional view of the structure of a battery cell in some embodiments of the present application. In the embodiments of the present application, the battery cell 10 includes a housing 11, a cell assembly 2, a bracket 3, and an insulating member 4.

[0095] The shape of the shell 11 is adjusted according to the type of battery cell 10, and the type of battery cell 10 in the embodiments of the present application is not limited. For example, when the battery cell 10 is a square battery, the shell 11 is square. When the battery cell 10 is a cylindrical battery, the shell 11 is cylindrical. The embodiments of the present application are all described as if the shell 11 is square. At the same time, the shell 11 is provided with a pole 12, which is used to electrically connect to the battery cell assembly 2 to ensure the normal charging and discharging operation of the battery cell 10. Generally, the number of poles is at least two, specifically at least one positive pole and at least one negative pole. For example, when the number of poles is two, one is a positive pole and the other is a negative pole, and the two are electrically connected to the positive and negative output positions of the battery cell assembly 2 respectively; for another example, when the number of poles is four, two can be positive poles and two can be negative poles. In this case, both positive poles are electrically connected to the positive output position of the battery cell assembly 2, and both negative poles are electrically connected to the negative output position of the battery cell assembly 2. The shell 11 may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold value. The pressure relief mechanism can release pressure when the internal pressure or temperature of the battery cell 10 is too high to prevent thermal runaway from being transmitted to other battery cells 10.

[0096] Furthermore, in the embodiment of the present application, the housing 11 specifically includes a housing body 111 and a housing cover 112 .

[0097] The housing 111 is a semi-enclosed structure with an opening 1110 at one end, or a ring-shaped structure with openings 1110 at both ends. The housing 111 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. The shape of the housing 111 can be determined based on the specific shape and size of the battery cell assembly 2. The housing 111 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this. The housing 111 has one or more openings 1110.

[0098] The shell cover 112 is a component that covers the opening 1110 of the shell body 111 to isolate the internal environment of the battery cell 10 from the external environment. Furthermore, the number of shell covers 112 matches the number of openings 1110. When there is one opening 1110, there is also one shell cover 112, which covers the opening 1110 to close it. When there are two openings 1110, there are two shell covers 112, which cover the two openings 1110 to close the corresponding openings 1110. The shell cover 112 and the shell body 111 can form a common connection surface before other components are inserted into the shell. When the interior of the shell body 111 needs to be enclosed, the shell cover 112 is then placed over the shell body 111. Furthermore, the shape of the shell cover 112 can be adapted to match the shape of the shell body 111 to ensure compatibility. Optionally, the shell cover 112 can be made of a material with a certain hardness and strength (such as an aluminum alloy). In this way, the shell cover 112 is less likely to deform when squeezed or collided, so that the battery cell 10 can have a higher structural strength and improved safety performance. Functional components such as the terminal 12 can be provided on the shell cover 112. The shell cover 112 can also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.

[0099] The shell 11 is provided with a pole 12, and the number of poles 12 is multiple. The multiple poles 12 can be all provided on the shell body 111, or all provided on the shell cover 112, or part of them can be provided on the shell body 111 and the other part of them can be provided on the shell cover 112. The following embodiments of the present application are all based on the shell body 111 being square, the number of openings 1110 of the shell body 111 being one, and the number of poles 12 being two, namely a positive pole and a negative pole, and both poles 12 being provided on the wall of the shell body 111 opposite to the opening 1110 for explanation. Of course, in other embodiments of the present application, the shape of the shell body 111, the number of openings 1110 and the shell cover 112, the number of poles 12, and the position of the poles 12 can all be adjusted according to needs, and the embodiments of the present application are not limited thereto.

[0100] In the embodiment of the present application, the battery cell assembly 2 includes an active material coating portion 21 and a conductive portion 22. The active material coating portion 21 is provided in the housing 11. The active material coating portion 21 is the portion of the battery cell assembly 2 coated with active material, which can assist in the deintercalation of metal ions during the charge and discharge process of the battery cell 10. The conductive portion 22 is a metal structure that electrically connects the active material coating portion 21 and the pole 12. It is not coated with active material. The pole 12 can be electrically connected to the active material coating portion 21 through the conductive portion 22 to enable the charge and discharge operation of the battery cell 10. The conductive portion 22 can be formed by the tab itself or by connecting the tab to the adapter.

[0101] The active material coating portion 21 is divided into a positive electrode active material coating portion and a negative electrode active material coating portion. The positive electrode active material coating portion includes the portion of the positive electrode current collector coated with the positive electrode active material layer, while the negative electrode active material coating portion includes the portion of the negative electrode current collector coated with the negative electrode active material layer. The conductive portion 22 is divided into a positive electrode conductive portion and a negative electrode conductive portion. The positive electrode conductive portion electrically connects the positive electrode active material coating portion to the positive electrode post, while the negative electrode conductive portion electrically connects the negative electrode active material coating portion to the negative electrode post.

[0102] In the embodiment of the present application, referring again to Figures 4 and 5, the bracket 3 is disposed at the end of the active material coating portion 21 away from the opening 1110, and the bracket 3 cooperates with the battery cell assembly 2. In the embodiment where the shell body 111 has only one opening 1110, when the battery cell assembly 2 with the bracket 3 is installed into the shell 11, the bracket 3 first enters the shell body 111 through the opening 1110 of the shell body 111, and then the active material coating portion 21 enters the shell body 111. After the battery cell assembly 2 is properly installed in the shell body 111, the bracket 3 is located at the wall of the shell body 111 opposite to the opening 1110 thereof and the end of the active material coating portion 21 away from the opening 1110. In an embodiment in which the shell body 111 has two openings 1110, the two openings 1110 can be a first opening and a second opening arranged opposite to each other. When the battery cell assembly 2 with the bracket 3 is installed into the shell body 11, the bracket 3 first enters the shell body 111 from the first opening of the shell body 111 and moves toward the second opening. Then the active material coating portion 21 enters the shell body 111. After the battery cell assembly 2 is installed in place in the shell body 111, the bracket 3 is located at the second opening.

[0103] The insulating member 4 wraps the active material coating portion 21 , and the insulating member 4 can improve the insulation reliability between the active material coating portion 21 and the shell 11 , reduce or prevent the active material coating portion 21 from contacting the shell 11 and causing the shell 11 to be corroded, reduce the leakage of the electrolyte caused by the corrosion of the shell 11 , and improve the reliability of the battery cell 10 .

[0104] Referring again to Figures 4 and 5 , bracket 3 comprises a main portion 36 and an extension portion 37. Extension portion 37 is disposed around main portion 36. The projection of main portion 36 on the plane of cover 112 lies within the projection of active material coating portion 21 on the plane of cover 112, while the projection of extension portion 37 on the plane of cover 112 lies outside the projection of active material coating portion 21 on the plane of cover 112. In other words, along a direction perpendicular to cover 112, the projection of bracket 3 on the plane of cover 112 at least partially extends beyond the projection of active material coating portion 21 on the plane of cover 112.

[0105] Among them, the bracket 3 can be a plate-like structure, and the bracket 3 can be arranged on the side of the active material coating part 21 with the conductive part 22. The bracket 3 can be provided with an avoidance structure for avoiding the conductive part 22 (such as an avoidance groove, or the via 311 described below, etc.). The bracket 3 can also be arranged on the side of the non-conductive part 22 of the active material coating part 21, so that the bracket 3 does not need to be provided with an avoidance structure for avoiding the conductive part 22.

[0106] When the bracket 3 is disposed on the side of the active material coating portion 21 where the conductive portion 22 is present, the bracket 3 can be disposed opposite the pole 12, that is, the bracket 3 and the pole 12 are located on the same side of the active material coating portion 21, and the bracket 3 can be disposed between the pole 12 and the active material coating portion 21. When the bracket 3 is disposed on the side of the active material coating portion 21 where the conductive portion 22 is absent, the bracket 3 and the pole 12 are not disposed opposite each other. For example, the bracket 3 and the pole 12 may be located on adjacent sides of the active material coating portion 21; or in another example, the bracket 3 and the pole 12 may be located on opposite sides of the active material coating portion 21.

[0107] It should be noted that in the embodiments of the present application, the bracket 3 in the embodiments of the present application can be added to the original structure of the battery cell in the prior art without changing the remaining structures of the battery cell in the prior art (such as the top cover, upper plastic body, lower plastic body, etc.); or an independent bracket 3 can be used to replace the lower plastic part embedded under the top cover of the battery cell in the prior art.

[0108] In the technical solution of the embodiment of the present application, the bracket 3 is arranged at the end of the active material coating part 21 away from the opening 1110, and the projection of the main body 36 on the plane of the shell cover 112 is arranged within the projection of the active material coating part 21 on the plane of the shell cover 112. Then they are put into the shell together. In the process of installing the battery cell assembly 2 with the bracket 3 into the shell 11, the bracket 3 will preferentially contact the shell body 111, to a certain extent preventing the end of the shell body 111 close to the opening 1110 from directly contacting the active material coating part 21, thereby minimizing the occurrence of the shell 11 scratching the active material coating part 21; the projection of the extension part 37 on the plane of the shell cover 112 is arranged outside the projection of the active material coating part 21 on the plane of the shell cover 112, which can protect the active material coating part 21 during the shell insertion process, reduce the probability of the active material coating part 21 touching the shell 11, and further reduce the occurrence of the shell 11 scratching the active material coating part 21. In addition, by providing a bracket 3, the occurrence of the shell 11 scratching the active material coating portion 21 is reduced, thereby reducing the possibility of the active material falling off, and to a certain extent preventing the internal short circuit caused by the detached active material overlapping with the pole piece of opposite polarity, and to a certain extent preventing the detached active material from chemically reacting with the shell 11, thereby causing the shell 11 to be corroded and penetrated, thereby improving the reliability of the battery cell 10.

[0109] In some embodiments, the extensions 37 are located on opposite sides of the main body 36 along a predetermined direction parallel to the plane of the cover 112. For example, referring to FIG4 , the cross-sectional shape of the battery cell 10 can be rectangular, with the height direction of the battery cell 10 being the first direction Z and the length direction of the battery cell 10 being the second direction X. The cover 112 is disposed at one end of the housing 11 in the height direction, and the extensions 37 are located on opposite sides of the main body 36 in the second direction. Of course, the cross-sectional shape of the battery cell 10 is not limited to a rectangle and can also be circular, etc., and this is not limited here.

[0110] In the above technical solution, the extension portion 37 is arranged on two opposite sides of the main body portion 36 along a preset direction, which can prevent the opposite side edges of the active material coating portion 21 from touching the shell 11 and avoid the shell 11 from scratching the opposite side edges of the active material coating portion 21.

[0111] In some embodiments, the extension portion 37 is an annular structure surrounding the main body portion 36. In other words, the projected edges of the bracket 3 on the plane of the shell cover 112 extend beyond the projection of the active material coating portion 21 on the plane of the shell cover 112. This configuration protects the outer edge of one end of the active material coating portion 21, preventing the outer edge of the active material coating portion 21 facing the bracket 3 from contacting the shell 11. This prevents the shell 11 from scratching the active material coating portion 21, further improving the reliability of the battery cell 10.

[0112] Referring again to Figure 5 and further to Figure 6 , Figure 6 is an enlarged view of the battery cell 10 shown in Figure 5 at point A. The edge of the bracket 3 facing away from the housing cover 112 has a guide surface 35, that is, a peripheral portion of the side surface of the bracket 3 facing away from the housing cover 112. Specifically, in Figure 6 , the edge of the bracket 3 facing away from the housing cover 112 includes at least the connection between the side of the extension 37 facing away from the main body 36 and the side facing away from the housing cover 112.

[0113] For example, the guide surface 35 may include a bevel. Specifically, a chamfer may be provided on one side edge of the bracket 3 facing away from the battery cell assembly 2. The "chamfer" here refers to processing the corners of the bracket 3 into a certain bevel by cutting or other processes, so as to facilitate the bracket 3 to be installed in the shell 11. For example, the guide surface 35 may include a curved surface. The curved surface can also play an automatic guiding role in the process of installing the bracket 3 into the shell 11. For example, the guide surface 35 may include a curved surface and a bevel. Of course, the guide surface 35 may also be other special-shaped surfaces, which are not limited here.

[0114] During the process of installing the battery cell assembly 2 with the bracket 3 into the housing 11 , the guide surface 35 can play a guiding role, so that the bracket 3 can be smoothly installed into the housing 111 , thereby improving assembly efficiency.

[0115] According to some embodiments of the present application, the bracket 3 is clamped or bonded to the battery cell assembly 2 .

[0116] Specifically, in an embodiment in which the bracket 3 is clamped to the battery cell assembly 2, a mounting groove can be provided on the bracket 3, 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 clamping the end of the active material coating portion 21 away from the opening 1110 to the bracket 3, and the connection structure is simple and easy to operate. Of course, the clamping method of the bracket 3 and the battery cell assembly 2 is not limited to the above structure. In an embodiment in which the bracket 3 and the battery cell assembly 2 are bonded, a connecting glue can be provided between the end of the active material coating portion 21 away from the opening 1110 and the bracket 3, or a connecting glue can be provided between the side wall of the active material coating portion 21 and the bracket 3, thereby achieving the purpose of bonding the active material coating portion 21 away from the opening 1110 to the bracket 3. Of course, the setting position of the connecting glue is not limited to the above position.

[0117] It should be noted that the connection method between the bracket 3 and the battery cell assembly 2 is not limited to the above structure, and can be selected according to actual conditions. Connecting the bracket 3 and the battery cell assembly 2 together can prevent the bracket 3 from falling off before entering the shell to a certain extent, thereby improving the product quality rate of the battery cell 10. The bracket 3 and the battery cell assembly 2 are entered into the shell together, which can not only protect the battery cell assembly 2 and ensure that the battery cell assembly 2 can be smoothly and safely entered into the shell, but also play an insulating role.

[0118] Please refer to Figures 7 and 8. Figure 7 is a front view of a battery cell 10 according to some embodiments of the present application. Figure 8 is a front view of a battery cell 10 according to other embodiments of the present application. A limiting protrusion 35 is provided on one side of the bracket 3, and the limiting protrusion 35 engages with the active material coating portion 21.

[0119] For example, the limiting protrusion 35 can be provided on the extension portion 37, and the limiting protrusion 35 can be provided on the side of the extension portion 37 close to the shell cover 112, that is, the limiting protrusion 35 is formed by the surface of the extension portion 37 close to the shell cover 112 protruding toward the shell cover 112; the limiting protrusion 35 can also be provided on the side of the extension portion 37 away from the main body 36, that is, one end of the limiting protrusion 35 is connected to the side of the extension portion 37 away from the main body 36, and the other end of the limiting protrusion 35 extends toward the direction close to the shell cover 112, and exceeds the end surface of the main body 36 close to the shell cover 112.

[0120] For example, the limiting protrusion 35 can be provided on the main body 36, and the limiting protrusion 35 can be provided on the side of the main body 36 close to the shell cover 112, that is, the limiting protrusion 35 is formed by the surface of the main body 36 close to the shell cover 112 protruding toward the shell cover 112.

[0121] For ease of understanding, the active material coating part 21 can be defined as having a first end 201 and a second end 202 that are relatively arranged, and the limiting protrusion 38 is stopped on the outside of the side wall of the active material coating part 21 near its first end 201. In the process of loading the battery cell assembly 2 with the bracket 3 into the shell 11, the first end 201 of the active material coating part 21 with the bracket 3 first enters the shell 11. As the assembly process proceeds, the first end 201 of the active material coating part 21 gradually moves away from the opening 1110 in the shell 11. During the assembly process, the limiting protrusion 38 is located between the side wall of the active material coating part 21 and the shell 11. After the battery cell assembly 2 and the bracket 3 are installed in place in the shell 11, the bracket 3 is located between the wall of the shell 11 opposite to its opening 1110 and the first end 201 of the active material coating part 21.

[0122] In this configuration, the retaining protrusion 38 can restrain one end of the active material coating portion 21, reducing the likelihood of the outer layer of the active material coating portion 21 becoming fluffy. It also protects one end of the active material coating portion 21, reducing the risk of the active material coating portion 21 contacting the housing 11 and thereby reducing the risk of the housing 11 scratching the active material coating portion 21. Furthermore, the retaining protrusion 38 engages the bracket 3 with the active material coating portion 21, preventing it from falling off before insertion into the housing, thereby improving the quality of the battery cell 10.

[0123] Referring to FIG. 7 again, the limiting protrusion 38 forms an annular protrusion, which extends along the circumference of the battery cell assembly 2 .

[0124] That is to say, the limiting protrusion 38 can be an integrated structure, and the limiting protrusion 38 is sleeved on the outside of the battery cell assembly 2. In this way, the limiting protrusion 38 can constrain the battery cell assembly 2 in the circumferential direction of the battery cell assembly 2, more effectively reduce the probability of the outer layer of the battery cell assembly 2 becoming fluffy, and also protect one end of the battery cell assembly 2, reducing the problem of one end of the battery cell assembly 2 touching the shell 11, thereby reducing the occurrence of the phenomenon of the shell 11 scratching the battery cell assembly 2.

[0125] Please refer to Figure 8 again. The limiting protrusions 38 can include multiple, and the multiple limiting protrusions 38 are arranged at intervals in the circumferential direction of the battery cell assembly 2, and there is a gap between two adjacent limiting protrusions 38. With this arrangement, the limiting protrusions 38 can not only restrain and protect the battery cell assembly 2, but also reduce materials and costs, and facilitate the assembly of the bracket 3 and the battery cell assembly 2.

[0126] Of course, the arrangement of the plurality of limiting protrusions 38 is not limited to the above, and can be selected based on actual needs. The limiting protrusions 38 may be in contact with the sidewalls of the cell assembly 2; alternatively, a gap may exist between the limiting protrusions 38 and the sidewalls of the cell assembly 2. In other words, the limiting protrusions 38 may or may not contact the sidewalls of the cell assembly 2. The limiting protrusions 38 stop the sidewalls of the cell assembly 2, reducing the likelihood of the outer layer of the cell assembly 2 becoming fluffy. They also protect the sidewalls of the cell assembly 2, reducing the risk of one end of the cell assembly 2 contacting the housing 11.

[0127] Please refer to Figure 9, which is a partial cross-sectional view of the battery cell 10 according to some embodiments of the present application. The surface of the retaining protrusion 38 facing the active material coating portion 21 may include a first surface 381. The first surface 381 mates with the sidewall of the active material coating portion 21. The first surface 381 can constrain the battery cell assembly 2 to reduce the likelihood of the outer layer of the active material coating portion 21 becoming fluffy. It also protects the sidewall of the active material coating portion 21, reducing the risk of one end of the active material coating portion 21 contacting the housing 11.

[0128] Please refer to Figure 10, which is a partial cross-sectional view of the battery cell 10 according to other embodiments of the present application. The surface of the position-limiting protrusion 38 facing the active material coating portion 21 may include a second surface 382. The distance between the second surface 382 and the active material coating portion 21 gradually increases along the direction from the bracket 3 toward the opening 1110. In other words, the second surface 382 extends obliquely away from the base of the position-limiting protrusion 38 and the sidewall of the active material coating portion 21. For example, the second surface 382 may be an inclined surface or a curved surface.

[0129] In this configuration, the second surface 382 can stop the sidewalls of the active material coating portion 21, thereby reducing the probability of the outer layer of the active material coating portion 21 becoming fluffy and protecting the sidewalls of the active material coating portion 21. In addition, the second surface 382 can serve as a guide, facilitating assembly and improving the assembly efficiency of the battery cell assembly 2 and the bracket 3. Please refer to Figure 11, which is a partial structural cross-sectional view of a battery cell 10 according to some other embodiments of the present application.

[0130] Please refer to Figure 11, which is a partial cross-sectional view of the battery cell 10 according to yet another embodiment 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 and a second surface 382. The first surface 381 is aligned with the sidewall of the active material coating portion 21, and the distance between the second surface 382 and the active material coating portion 21 gradually increases along the direction from the bracket 3 toward the opening 1110. The first surface 381 is located between the base of the position-limiting protrusion 38 and the second surface 382.

[0131] Specifically, the contour line of the first surface 381 can be a straight line extending vertically along the height direction of the bracket 3, and the contour line of the second surface 382 can be an oblique line inclined along the height direction of the bracket 3. Such a setting can not only play a good restraining role on the active material coating part 21, effectively reducing the probability of the outer layer of the active material coating part 21 becoming fluffy, but also facilitate assembly and improve the assembly efficiency of the battery cell assembly 2 and the bracket 3.

[0132] Please refer to Figure 12, which is a partial cross-sectional view of the battery cell structure of some other embodiments of the present application. The side of the bracket 3 facing the battery cell assembly 2 has a clearance portion 391, which is used to avoid the outer edge of the battery cell assembly 2 facing the bracket 3, thereby reducing the risk of the bracket 3 crushing the battery cell assembly 2.

[0133] Specifically, in the embodiment in which the bracket 3 has a limiting protrusion 38, when the bracket 3 is formed, a rounded corner structure may appear at the root of the limiting protrusion 38 on one side close to the center of the bracket 3. By providing a clearance portion 391, the rounded corner structure between the limiting protrusion 38 and the main body 36 can be removed to prevent the rounded corner structure from crushing the outer edge of the battery cell assembly 2. The clearance portion 391 can be a groove opening toward the battery cell assembly 2. For example, the groove can be an annular groove. For another example, the groove can include multiple grooves arranged at intervals. The shape of the groove can be selected according to actual conditions. For another example, the clearance portion 391 can also be a clearance slope or a clearance arc surface that forms a clearance for the battery cell assembly 2. In other embodiments of the present application, the side of the bracket 3 facing the battery cell assembly 2 can also be in full contact with the battery cell assembly 2, that is, there is no clearance structure on the side of the bracket 3 facing the battery cell assembly 2.

[0134] Please refer to Figures 13 to 15. Figure 13 is a structural cross-sectional view of the battery cell 10 of some embodiments of the present application after the battery cell assembly 2 is assembled with the bracket 3 and the insulating part 4. Figure 14 is an enlarged view of the battery cell 10 at B shown in Figure 13. Figure 15 is a structural cross-sectional view of the battery cell 10 of other embodiments of the present application after the battery cell assembly 2 is assembled with the bracket 3 and the insulating part 4. The battery cell 10 may also include an insulating part 4, which is wrapped around the active material coating portion 21, and the insulating part 4 is connected to the extension portion 37. Among them, the insulating part 4 and the bracket 3 can be connected by bonding or by hot melt. Of course, the insulating part 4 and the bracket 3 can also be connected in other ways.

[0135] When the battery cell assembly 2 with the bracket 3 is installed in place in the shell 11, the insulating part 4 is located between the active material coating part 21 and the shell 11, which can play an insulating role and protect the battery cell assembly 2, preventing the battery cell assembly 2 from overlapping with the shell 11 of the battery cell 10, and effectively reducing the corrosion of the battery cell assembly 2 due to leakage; the insulating part 4 is connected to the extension part 37 to facilitate fixing the insulating part 4.

[0136] Referring again to Figures 13 and 14 , the insulating member 4 is connected to the peripheral wall surface 370 of the extension portion 37. The "peripheral wall surface 370 of the extension portion 37" refers to the outer wall surface of the extension portion 37 extending along its height direction (the vertical direction in the figure). For example, if the bracket 3 is a rectangular plate, the peripheral wall surface 370 of the bracket 3 includes four sidewall surfaces, each of which is parallel to the height direction (the vertical direction in the figure) of the bracket 3. If the bracket 3 is cylindrical, the peripheral wall surface 370 of the bracket 3 is a cylindrical surface. Of course, the bracket 3 can also have an irregular structure.

[0137] Specifically, in the embodiment of the hot-melt connection between the insulating part 4 and the bracket 3, the insulating part 4 and the peripheral wall surface 370 of the bracket 3 are hot-melt connected to form a connection mark 401. The connection mark 401 can be an annular structure extending along the circumference of the bracket 3, or it can be a connection structure including multiple circumferentially spaced connection structures of the bracket 3.

[0138] More specifically, in an embodiment where the battery cell assembly 2 is a rectangular parallelepiped, the bracket 3 can be a rectangular plate of corresponding shape, the insulating member 4 wraps the four side walls of the battery cell assembly 2, and the insulating member 4 is hot-melt connected to the four side walls of the bracket 3. The insulating member 4 is hot-melt connected to each side wall of the bracket 3 to form a connection mark 401, thereby improving the connection reliability between the insulating member 4 and the bracket 3.

[0139] In the above technical solution, by connecting the insulating member 4 to the peripheral wall surface 370 of the bracket 3, the connection reliability between the insulating member 4 and the bracket 3 can be improved and the risk of the insulating member 4 falling off can be reduced.

[0140] Please refer to Figures 9 to 12 again. The peripheral wall surface 370 has a first step surface 371 and a second step surface 372. The second step surface 372 is located on the side of the first step surface 371 close to the shell cover 112. The second step surface 372 is closer to the active material coating portion 21 than the first step surface 371. The insulating part 4 is connected to the second step surface 372.

[0141] In the above technical solution, the peripheral wall surface 370 is set to include a first step surface 371 and a second step surface 372, which can provide an installation space for the insulating part 4. The insulating part 4 is connected to the second step surface 372, which can reduce the risk of the connection structure between the insulating part 4 and the second step surface 372 falling off due to scratching the shell 11, thereby further improving the connection reliability between the insulating part 4 and the bracket 3.

[0142] In some embodiments, the first stepped surface 371 is further away from the active material coating portion 21 than the outer surface of the insulating member 4. In other words, the first stepped surface 371 extends beyond the connection between the bracket 3 and the insulating member 4. When the battery cell assembly 2 with the bracket 3 is installed into the housing 11, the bracket 3 first enters the housing 111 through the opening 1110, and then the active material coating portion 21 wrapped with the insulating member 4 enters the housing 111 through the opening 1110.

[0143] Since the first step surface 371 is farther away from the active material coating portion 21 than the outer side surface of the insulating part 4, during the shell insertion process, the first step surface 371 can not only protect the edges of the insulating part 4 and the edges of the active material coating portion 21, reducing the occurrence of the edges of the insulating part 4 and the edges of the active material coating portion 21 scratching the inner wall of the shell 11, but also protect the connection position between the insulating part 4 and the second step surface 372, reducing the risk of the connection structure between the insulating part 4 and the second step surface 372 falling off due to scratching the shell 11, and further improving the connection reliability between the insulating part 4 and the bracket 3.

[0144] Referring again to FIG. 15 , the battery cell 10 further includes an insulating member 4 . The insulating member 4 wraps the active material coating portion 21 , and the insulating member 4 is connected to a surface of the main body 36 away from the shell cover 112 .

[0145] By connecting at least a portion of the insulating part 4 to the wall of the main body 36 away from the battery cell assembly 2, on the one hand, in the process of installing the battery cell assembly 2 with the bracket 3 into the shell 11, the shell 11 will not scratch the edge of the insulating part 4, nor will it scratch the connection position between the insulating part 4 and the main body 36, and the connection position between the two is not easily pulled apart during the shell insertion process, which can reduce the movement and sliding of the insulating part 4 during the shell insertion process of the battery cell assembly 2, and can improve the connection reliability between the insulating part 4 and the bracket 3, reduce the risk of the insulating part 4 falling off, and further reduce the risk of the shell 11 being corroded due to leakage of the battery cell assembly 2, reduce the risk of the battery cell assembly 2 itself failing, and reduce the risk of leakage, thereby improving the reliability and stability of the battery cell 10; in addition, by connecting at least a portion of the insulating part 4 to the wall of the main body 36 away from the battery cell assembly 2, the size of the insulating part 4 can also be designed to be longer, which can be suitable for battery cell assemblies 2 of different sizes, has higher compatibility, and can improve manufacturability. On the other hand, after the bracket 3 and the battery cell assembly 2 are installed in place in the shell 11, the insulating part 4 is pressed between the wall of the shell 11 opposite to the opening 1110 and the main body 36, which can further reduce the risk of the insulating part 4 falling off, reduce the risk of the battery cell assembly 2 failing due to leakage, and at the same time reduce the risk of corrosion of the shell 11, thereby improving the reliability and stability of the battery cell 10.

[0146] According to some optional embodiments of the present application, the insulating member 4 is continuously connected to the main body 36 in a circular shape in the circumferential direction away from the wall surface of the battery cell assembly 2. The circular connection here means that the connection position between the insulating member 4 and the main body 36 extends along the circumference of the main body 36 to form a closed ring.

[0147] Such a setting can increase the connection area between the insulating part 4 and the bracket 3, so as to improve the connection reliability and stability between the insulating part 4 and the bracket 3 in the circumferential direction of the bracket 3, further reduce the risk of the insulating part 4 falling off, and thereby improve the reliability of the battery cell assembly 2 entering the shell, thereby ensuring the reliability and stability of the battery cell 10.

[0148] In the embodiment of the present application, the insulating member 4 is connected to the wall of the bracket 3 away from the battery cell assembly 2 at an annular interval. In other words, the insulating member 4 is connected to the bracket 3 at multiple locations, and the multiple connection locations are arranged at intervals along the circumference of the bracket 3. On the basis of ensuring the reliability and stability of the connection between the insulating member 4 and the bracket 3 along the circumference of the bracket 3, it can save connection materials, reduce material costs, simplify connection steps, and improve production efficiency.

[0149] Of course, in other embodiments of the present application, the insulating member 4 and the wall of the bracket 3 away from the battery cell assembly 2 can also be continuously connected in a circumferential ring shape. The ring connection here means that the connection position between the insulating member 4 and the bracket 3 extends along the circumference of the bracket 3 to form a closed ring. Such an arrangement can increase the connection area between the insulating member 4 and the bracket 3, thereby improving the reliability and stability of the connection between the insulating member 4 and the bracket 3 in the circumferential direction of the bracket 3, further reducing the risk of the insulating member 4 falling off, and thereby improving the reliability of the battery cell assembly 2 entering the shell, ensuring the reliability and stability of the battery cell 10.

[0150] In addition, in other embodiments of the present application, the connection positions between the insulating member 4 and the bracket 3 can be concentrated on two opposite sides, two adjacent sides, or multiple sides of the bracket 3. The specific selection can be based on the actual shapes of the battery cell assembly 2 and the bracket 3, and is not limited here.

[0151] Please refer to Figure 15 again. In the embodiment of the present application, the connection method between the insulating part 4 and the bracket 3 can be a hot melt connection, and the insulating part 4 and the bracket 3 are hot-melt connected away from the wall of the battery cell assembly 2 to form a connection mark 401. The position of the connection mark 401 is not limited by space. Compared with the related art, the area of ​​the connection mark 401 can be designed to be larger, making the connection more secure and reducing the risk of the insulating part 4 falling off.

[0152] Specifically, in the embodiment of the present application, there are multiple connection marks 401, and the multiple connection marks 401 are arranged at intervals around the circumference of the wall surface of the bracket 3 away from the battery cell assembly 2. In other embodiments of the present application, the connection marks 401 can also extend in an annular manner around the circumference of the wall surface of the bracket 3 away from the battery cell assembly 2, so as to make the connection between the insulating member 4 and the bracket 3 more secure, thereby fully improving the connection reliability between the insulating member 4 and the bracket 3 and reducing the risk of the insulating member 4 falling off.

[0153] It should be noted that, in the embodiment of the present application, the shape of the connection mark 401 can be rectangular, circular, elliptical, etc., or it can be an irregular shape. The arrangement of the multiple connection marks 401 can be selected according to the actual shape of the battery cell assembly 2 and the bracket 3. For example, when the cross-sectional shape of the battery cell assembly 2 and the bracket 3 is square or rectangular, the multiple connection marks 401 can be distributed near the four edges of the bracket 3, or they can be concentrated near the edges on opposite sides of the bracket 3. For another example, when the cross-sectional shape of the battery cell assembly 2 and the bracket 3 is circular, the multiple connection marks 401 can be evenly distributed around the circumference of the wall of the bracket 3 away from the battery cell assembly 2.

[0154] Of course, the distribution form of multiple connection marks 401 is not limited to the above form, and the distance between two adjacent connection marks 401 can be adjusted as needed. The number of connection marks 401 can be appropriately increased to save materials and reduce costs while ensuring the connection reliability between the insulating part 4 and the bracket 3.

[0155] Taking the cell assembly 2 as a rectangular parallelepiped as an example, in the embodiments of the present application, the bracket 3 can be a rectangular plate of corresponding shape, the bracket 3 is arranged on one wall surface of the cell assembly 2, and the insulating member 4 wraps around the remaining five circumferential walls of the cell assembly 2 to ensure the insulation effect between the cell assembly 2 and the housing 11. At the same time, the connection mark 401 formed by the insulating member 4 and the wall surface of the bracket 3 away from the cell assembly 2 can be arranged adjacent to the circumferential edge of the bracket 3, and can be adjacent to two, three, or four circumferential edges of the bracket 3. The number of connection marks 401 formed by the insulating member 4 connecting with the corresponding edges can be increased or decreased according to the size of the corresponding edges, and the embodiments of the present application are not limited thereto.

[0156] In the above technical solution, on the one hand, the hot-melt connection method is adopted, which can facilitate the cooperation between the insulating part 4 and the bracket 3, improve the assembly efficiency, ensure the efficiency of the battery cell assembly 2 entering the shell, and save the assembly and manufacturing costs; on the other hand, whether the connection mark 401 is extended in a circumferential ring or arranged in a circumferential interval, it can improve the firmness of the connection between the insulating part 4 and the bracket 3, and improve the reliability and stability of the connection between the insulating part 4 and the bracket 3, so as to fully reduce the risk of the insulating part 4 falling off; at the same time, compared with the circumferential ring extension, the circumferential interval arrangement can also save materials and reduce costs on the basis of ensuring the reliability of the connection between the insulating part 4 and the bracket 3.

[0157] Please refer again to Figure 13, and further to Figures 16 and 17. Figure 16 is a schematic diagram of the structure of the bracket 3 of the battery cell 10 in some embodiments of the present application. Figure 17 is a schematic diagram of the structure of the bracket 3 of the battery cell 10 in some other embodiments of the present application. To facilitate the connection of the conductive portion 22 with the pole 12 from the side of the active material coating portion 21 close to the bracket 3, in the embodiment of the present application, the conductive portion 22 is connected to the side of the active material coating portion 21 close to the main body 36. The main body 36 has a through hole 311, and the conductive portion 22 passes through the through hole 311 to connect with the pole 12.

[0158] The shape of the via hole 311 can be selected based on the shape of the conductive portion 22. For example, if the cross-sectional shape of the conductive portion 22 extending into the via hole 311 is a long strip, the shape of the via hole 311 can be a regular shape such as a square, rectangle, ellipse, or oblong, or an irregular shape. For another example, if the cross-sectional shape of the conductive portion 22 extending into the via hole 311 is a circle, the shape of the via hole 311 can be a circle, square, or oblong, etc.

[0159] It can be understood that the outer surface of the conductive part 22 can be in direct contact with the hole wall of the via 311, and there can also be a gap between the outer surface of the conductive part 22 and the hole wall of the via 311, so that the conductive part 22 can pass through the via 311 while ensuring that the conductive part 22 is not damaged.

[0160] In the above technical solution, on the one hand, by providing the through hole 311 on the main body 36, the bracket 3 can play the role of retracting and accommodating the conductive part 22, thereby facilitating the connection between the conductive part 22 and the pole 12, and improving the assembly reliability and convenience of the battery cell 10; on the other hand, the bracket 3 retracts the conductive part 22, which can eliminate the structure of the plastic parts in the original battery cell 10, and can achieve insulation between the entire active material coating part 21 and the shell 11 through the cooperation of the bracket 3 and the insulating part 4, which can effectively reduce the manufacturing and production costs.

[0161] Of course, the conductive portion 22 may also be provided on one side of the bracket 3 , and the conductive portion 22 has no matching relationship with the bracket 3 .

[0162] In some embodiments of the present application, the bracket 3 may be an integral structure or a split structure. Referring to FIG16 , when the bracket 3 is an integral structure, the through hole 311 is formed in the form of a through hole that passes through the bracket 3. As a result, the integral structure of the bracket 3 is easy to process, and the reliability of the bracket 3 is better. It is also convenient to assemble the bracket 3 with the shell assembly 1, thereby improving assembly efficiency and matching stability. It is understandable that how the bracket 3 is processed can be specifically selected according to the material of the bracket 3. For example, when the bracket 3 is an insulating plastic part, the integral structure of the bracket 3 can be obtained by injection molding.

[0163] Referring to FIG. 17 , when the bracket 3 is a split structure, the bracket 3 may include a first bracket 33 and a second bracket 34 that are formed separately, and a through hole 311 is defined between the first bracket 33 and the second bracket 34 .

[0164] In the embodiment of the present application, the first bracket 33 and the second bracket 34 are both long, plate-like structures that can be detachably connected, for example, by plugging or snapping them together for easy assembly. Furthermore, the first bracket 33 has a semi-hole structure on one side near the second bracket 34, and the second bracket 34 also has another semi-hole structure of a matching shape near the first bracket 33. Together, the semi-hole structures of the first bracket 33 and the semi-hole structures of the second bracket 34 form an annular through-hole 311. That is, the through-hole 311 is defined between the first bracket 33 and the second bracket 34.

[0165] In the above technical solution, the through hole 311 is defined by the cooperation of the first bracket 33 and the second bracket 34. When the bracket 3 is assembled with the battery cell assembly 2, there is no need to pass the conductive part 22 from one end of the through hole 311 to the other end. Instead, the first bracket 33 and the second bracket 34 can be spliced ​​at the position of the conductive part 22 to clamp the conductive part 22, so that the through hole 311 surrounds the conductive part 22, which facilitates the assembly of the bracket 3 and the battery cell assembly 2 and improves the assembly efficiency.

[0166] As an optional solution, when the cross-section of the via 311 is long and strip-shaped, the first bracket 33 and the second bracket 34 are placed on both sides of the width direction of the via 311. For example, if the width direction of the via 311 is the left and right direction, the first bracket 33 and the second bracket 34 are located on the left and right sides of the via 311, which facilitates the cooperation between the first bracket 33, the second bracket 34 and the conductive part 22.

[0167] Referring to Figure 18 , which is a partial cross-sectional view of a battery cell 10 according to some embodiments of the present application, a receiving groove 393 is defined on the side of the main body 36 facing away from the active material coating portion 21 . The receiving groove 393 is connected to the via 311 and is used to accommodate at least a portion of the terminal 12 .

[0168] The shape of the receiving groove 393 can match the shape of the terminal 12. For example, if the cross-section of the terminal 12 is an elongated strip, the shape of the receiving groove 393 can be a regular shape such as a square, rectangle, ellipse, or oblong, or an irregular shape. For another example, if the cross-section of the terminal 12 is a circle, the shape of the receiving groove 393 can be a circle, square, or oblong, etc.

[0169] It is understandable that the outer surface of the pole 12 can be in direct contact with the side wall of the accommodating groove 393, or there can be a gap between the outer surface of the pole 12 and the side wall of the accommodating groove 393. On the basis of ensuring that the pole 12 is not damaged, at least a portion of the pole 12 can be accommodated in the accommodating groove 393.

[0170] In the above technical solution, on the one hand, by accommodating at least part of the pole 12 through the accommodating groove 393, the structure of the entire battery cell 10 is made more compact and reliable, which is conducive to improving the energy density of the entire battery 100; on the other hand, through the setting of the accommodating groove 393, the pole 12 and part of the shell 11 can be insulated by the bracket 3, so as to further improve the stability and reliability of the battery cell 10; in addition, by accommodating the pole 12 through the accommodating groove 393, the stability and reliability of the pole 12 can also be improved, so as to further improve the stability and reliability of the battery cell.

[0171] Referring again to FIG. 18 , a positioning portion 32 is provided on a side of the main body 36 facing away from the active material coating portion 21 . The positioning portion 32 is disposed around the via hole 311 and extends toward the terminal 12 .

[0172] In some embodiments, the positioning portion 32 may be an annular boss extending along the circumference of the through hole 311. In other embodiments, the positioning portion 32 may include two opposing boss structures, with the two boss structures located on opposite sides of the through hole 311. For example, the through hole 311 may be formed as an elongated hole, and the two boss structures may be disposed opposite each other in the width direction of the elongated hole, with each boss structure extending along the length of the elongated hole.

[0173] In the above technical solution, by setting the positioning portion 32, during the assembly process of the bracket 3 and the pole 12, the positioning portion 32 is used in conjunction with the through hole 311, so that the bracket 3 and the pole 12 can be positioned and installed, which is beneficial to improving the assembly efficiency of the battery cell 10. When the conductive portion 22 passes through the through hole 311, the positioning portion 32 can restrain, retract, and support the conductive portion 22, which is convenient for connecting the conductive portion 22 and the pole 12, and can improve the assembly efficiency and assembly quality of the battery cell 10.

[0174] 18 again, the pole 12 is provided with a receiving portion 121, in which at least a portion of the conductive portion 22 is received, and at least a portion of the positioning portion 32 extends into the receiving portion 121 to guide the conductive portion 22 to be received in the receiving portion 121. In other words, the pole 12 is provided with a hollow structure.

[0175] In the above technical solution, on the one hand, by configuring the terminal 12 as a hollow structure and cooperating the positioning portion 32 with the hollow structure, the conductive portion 22 can be guided to connect with the terminal 12, thereby improving connection reliability and ensuring assembly efficiency and quality. On the other hand, the conductive portion 22 can be accommodated within the accommodating portion 121, which improves the assembly efficiency of the conductive portion 22, saves the space occupied by the conductive portion 22, and fully utilizes the space of the battery cell 10. This makes the cooperation between the bracket 3 and the terminal 12, and between the bracket 3 and the conductive portion 22, tighter and more reliable, making the structure of the battery cell 10 more compact and more conducive to improving the energy density of the battery cell 10. In addition, the cooperation of the positioning portion 32 with the accommodating portion 121 allows the bracket 3 to be positioned and installed with the terminal 12, which is conducive to improving the assembly efficiency of the battery cell 10.

[0176] Referring again to FIG. 18 and further to FIG. 19 , FIG. 19 is a cross-sectional view of the structure of the bracket 3 of the battery cell 10 according to some embodiments of the present application. A guide groove 312 is formed on the side of the main body 36 facing the active material coating portion 21. The guide groove 312 communicates with the via 311 and accommodates at least a portion of the conductive portion 22. The cross-sectional area of ​​the guide groove 312 gradually increases as the main body 36 approaches the active material coating portion 21.

[0177] Specifically, the groove wall of the guide groove 312 can be a slope or arc surface extending from the inside to the outside toward the active material coating portion 21. The "inside" here refers to a position close to the center of the guide groove 312. On the contrary, the "outside" here refers to a position away from the center of the guide groove 312, that is, a position close to the edge of the guide groove 312.

[0178] The guide groove 312 can accommodate the conductive part 22 and avoid the conductive part 22 to avoid being crushed. It can also reduce the probability of the conductive part 22 becoming fluffy and folded, thereby reducing redundancy.

[0179] Please refer to Figures 20 and 21. Figure 20 is a top view of the bracket 3 of the battery cell 10 in some embodiments of the present application. Figure 21 is a top view of the bracket 3 of the battery cell 10 in other embodiments of the present application. In some embodiments, the bracket 3 has at least one first liquid injection guide groove 392, which is located on the side of the bracket 3 facing the active material coating portion 21.

[0180] During injection, the electrolyte can flow along the first injection channel 392, providing an infiltration path for the electrolyte. The first injection channel 392 can also increase the fluidity of the electrolyte, speed up the injection, and reduce the formation static time. In addition, the provision of the first injection channel 392 increases the contact area between the electrolyte and the active material coating portion 21, which can reduce the problem of poor infiltration of the active material coating portion 21.

[0181] Among them, at least one first liquid injection guide groove 392 is connected to the guide groove 312, and the electrolyte entering the shell 11 can flow along the first liquid injection guide groove 392 toward the guide groove 312, so that the electrolyte can flow to a predetermined position, further increasing the contact area between the electrolyte and the active material coating part 21.

[0182] Please refer to Figure 20 again. In an embodiment where the bracket 3 is an integrated structure and two poles 12 are provided on the shell 11, the two ends of the first liquid injection guide groove 392 can respectively correspond to the positions of the two poles 12, and the two ends of the first liquid injection guide groove 392 are respectively connected to the two guide grooves 312, and the electrolyte can flow along the first liquid injection guide groove 392 toward the two guide grooves 312.

[0183] Please refer to Figure 21 again. In an embodiment in which the bracket 3 is a split structure and two poles 12 are provided on the shell 11, the bracket 3 may include a separately formed first bracket 33 and a second bracket 34. A through hole 311 is defined between the first bracket 33 and the second bracket 34. At least one first liquid injection guide groove 392 is respectively provided on the first bracket 33 and the second bracket 34. The two ends of each first liquid injection guide groove 392 can respectively correspond to the positions of the two poles 12, and the two ends of the first liquid injection guide groove 392 are respectively connected to the two guide grooves 312, and the electrolyte can flow along the first liquid injection guide groove 392 toward the two guide grooves 312.

[0184] In some embodiments, a second liquid injection guide groove (not shown in the figure) can be further provided on the bracket 3 as required, and the second liquid injection guide groove is located on the side of the bracket 3 facing away from the active material coating portion 21. By such a configuration, during liquid injection, the electrolyte can flow along the first liquid injection guide groove 392 and / or the second liquid injection guide groove, providing an infiltration path for the electrolyte, and can increase the fluidity of the electrolyte, improve the injection speed, and reduce the formation static time.

[0185] It should be noted that in the embodiments of the present application, the depth of the first liquid injection guide groove 392 and / or the second liquid injection guide groove is greater than or equal to 0.1 mm. For example, the depth of the first liquid injection guide groove 392 and / or the second liquid injection guide groove can be 0.1 mm, 0.2 mm, 0.5 mm, etc., and can be selected according to actual needs.

[0186] Referring again to FIG. 17 , in the embodiment of the present application, the conductive portion 22 is connected to the side of the active material coating portion 21 near the bracket 3 , and the terminal 12 is provided with a receiving portion 121 . At least a portion of the conductive portion 22 is received within the receiving portion 121 , which is used to guide the conductive portion 22 within the receiving portion 121 to facilitate electrical connection between the conductive portion 22 and the terminal 12 . In other words, the terminal 12 is configured as a hollow structure.

[0187] Here, "at least partially" means that the conductive portion 22 can be completely accommodated within the accommodating portion 121, or only partially accommodated within the accommodating portion 121. Since the terminal 12 is provided with the accommodating portion 121, the hollow structure of the accommodating portion 121 can reduce the weight of the terminal 12 to a certain extent, thereby improving the weight energy density of the battery cell 10 and the battery 100. Furthermore, by providing the terminal 12 with a hollow structure and cooperating with the positioning portion 32 with the hollow structure, the conductive portion 22 can be guided to connect with the terminal 12, improving connection reliability and ensuring assembly efficiency and quality. Furthermore, the conductive portion 22 can be accommodated within the accommodating portion 121, which improves assembly efficiency and saves space occupied by the conductive portion 22, fully utilizing the space in the battery cell 10. This ensures a tighter and more reliable fit between the bracket 3 and the terminal 12, and between the bracket 3 and the conductive portion 22, making the battery cell 10 more compact and more conducive to improving the energy density of the battery cell 10.

[0188] More specifically, by partially or entirely containing the conductive portion 22 within the accommodating portion 121, the portion of the conductive portion 22 located within the accommodating portion 121 can occupy the space within the terminal 12, thereby reducing the space occupied by the conductive portion 22 within the housing 11. When the size of the housing 11 is fixed, some space can be saved within the housing 11 to accommodate a larger active material coating portion 21, thereby improving the volumetric energy density of the battery cell 10. For example, when the conductive portion 22 is extended from the side of the active material coating portion 21 close to the terminal 12, the space occupied by the conductive portion 22 between the active material coating portion 21 and the terminal 12 can be reduced, the size of the active material coating portion 21 in the direction in which the conductive portion 22 is extended can be increased, the distance between the active material coating portion 21 and the terminal 12 can be reduced, and the energy density of the battery cell 10 can be improved.

[0189] At the same time, by accommodating at least part of the conductive part 22 in the accommodating part 121, the space occupied by the battery cell 10 itself can be reduced, so that the battery 100 of the same volume can accommodate a larger number of battery cells 10, and the volume energy density of the battery 100 can be improved; in addition, accommodating at least part of the conductive part 22 in the accommodating part 121 to occupy the space in the terminal 12 can reduce the redundancy of the conductive part 22 in the shell 11 to at least a certain extent, reduce the probability of short circuit between the conductive part 22 and the active material coating part 21, reduce the probability of short circuit of the battery cell 10, and improve the working reliability and stability of the battery cell 10 and the battery 100.

[0190] It should be noted that, in the embodiment of the present application, the accommodation portion 121 may be located on the side of the pole 12 facing the active material coating portion 21 or on the side of the pole 12 facing away from the active material coating portion 21 .

[0191] For example, please refer to Figures 22 and 23. Figure 22 is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. Figure 23 is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. When the accommodating portion 121 is located on the side of the pole 12 facing the active material coating portion 21, the accommodating portion 121 includes a first accommodating groove 12110, and the surface of the pole 12 facing the active material coating portion 21 is the pole inner end face 122. The notch of the first accommodating groove 12110 is formed on the pole inner end face 122, and at least a portion of the conductive portion 22 is accommodated in the first accommodating groove 12110.

[0192] Exemplarily, the first receiving groove 12110 is a groove body, which is a groove-like structure with a certain depth. For example, when the pole 12 is disposed on the upper end wall of the housing 11 and the pole inner end surface 122 is the lower surface of the pole 12, the first receiving groove 12110 is formed as a receiving groove with a groove opening open downward and the groove wall recessed upward. For another example, when the pole 12 is disposed on the lower end wall of the housing 11 and the pole inner end surface 122 is the upper surface of the pole 12, the first receiving groove 12110 is formed as a receiving groove with a groove opening open upward and the groove wall recessed downward.

[0193] In the above technical solution, on the one hand, the first receiving groove 12110 provided on the terminal 12 can reduce the weight of the terminal 12 to a certain extent, thereby increasing the weight energy density of the battery cell 10 and the battery 100. On the other hand, because the notch of the first receiving groove 12110 is formed on the terminal inner end surface 122, which is the surface of the terminal 12 on the side close to the active material coating portion 21, the first receiving groove 12110 can be opened toward the active material coating portion 21, thereby facilitating the insertion of the conductive portion 22 into the first receiving groove 12110 and improving assembly efficiency. Furthermore, this type of first receiving groove 12110 is easier to process, improving production efficiency.

[0194] Moreover, the first receiving groove 12110 can be easily processed to have a larger volume, which can accommodate more conductive parts 22; at the same time, since the first receiving groove 12110 is open toward the active material coating part 21, the first receiving groove 12110 can also serve as a buffer and temporary storage structure for the electrolyte, so that more electrolyte can be accommodated in the shell 11. Since the battery cell 10 will lose electrolyte during the charging and discharging process, when there is more electrolyte, the service life of the battery cell 10 can be extended; and also because the first receiving groove 12110 is open toward the active material coating part 21, the first receiving groove 12110 can also serve as a storage and buffer structure for gas production inside the battery cell assembly 2, reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0195] In addition, since the first receiving groove 12110 is located on the inner side of the pole 12, external foreign matter and impurities are not easy to enter the first receiving groove 12110, which can reduce the impact of external foreign matter and impurities on the battery cell assembly 2, and improve the stability and reliability of the battery cell assembly 2, thereby improving the stability and reliability of the battery cell 10 and the battery 100.

[0196] Referring again to FIG. 22 , in the embodiment of the present application, the connection method between the pole 12 and the housing 11 is not limited, and may be welding or riveting. For example, when the two are riveted, the housing 11 has a mounting hole 113, and the pole 12 is riveted to the mounting hole 113. Of course, it is understood that when the two are welded or otherwise coupled, the housing 11 may also have a mounting hole 113 to facilitate the mounting of the pole 12 to the housing 11 through the mounting hole 113, and this is not limited here.

[0197] At the same time, the first accommodating groove 12110 can be set corresponding to the position of the mounting hole 113, or in other words, on the projection plane perpendicular to the axial direction R of the pole 12, the orthographic projection of the first accommodating groove 12110 is located within the orthographic projection range of the mounting hole 113, so that the first accommodating groove 12110 can have a larger depth to accommodate more conductive parts 22, thereby reducing the space occupied by the conductive parts 22 in the shell 11 to a greater extent.

[0198] Specifically, when the housing 11 is provided with a mounting hole 113 and the pole 12 is mounted in the mounting hole 113 , along the axial direction R of the pole 12 , the depth H1 of the first accommodating groove 12110 is greater than or equal to the minimum distance H2 from the inner end surface 122 of the pole to the mounting hole 113 .

[0199] It should be noted that the specific shape of the first receiving groove 12110 is not limited and can be regular or irregular, such as a cylindrical groove with a rectangular, elliptical, or racetrack-shaped cross-section, a trapezoidal groove with a rectangular cross-section and gradually changing cross-sectional dimensions, a hemispherical groove with a circular cross-section and gradually changing cross-sectional dimensions, or a hemispherical groove with an elliptical cross-section and gradually changing cross-sectional dimensions, etc. Therefore, the depth H1 of the first receiving groove 12110 refers to the maximum depth of the first receiving groove 12110 along the axial direction R of the pole 12.

[0200] Since in the axial direction R of the pole 12, the depth H1 of the first accommodating groove 12110 is greater than or equal to the minimum distance H2 from the inner end face 122 of the pole to the mounting hole 113, the volume of the pole 12 can be fully utilized, so that the first accommodating groove 12110 has a larger depth, which is conducive to accommodating more conductive parts 22, and thus can greatly reduce the space occupied by the conductive parts 22 in the shell 11, further improve the energy density of the battery cell 10, and further reduce the redundancy of the conductive parts 22 in the shell 11; at the same time, since the first accommodating groove 12110 has a larger depth, it can also accommodate the gas production of the battery cell assembly 2, ensure 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.

[0201] Please refer to Figures 22 and 23 again. In order to ensure the stability and reliability of the electrical connection between the active material coating part 21 and the pole 12, in some embodiments of the present application, the electrical connection position between the conductive part 22 and the pole 12 can be located on the groove wall of the first accommodating groove 12110 formed by the accommodating part 121.

[0202] Exemplarily, the conductive part 22 and the pole 12 can be electrically connected by welding, and the electrical connection position is the welding position of the conductive part 22 and the pole 12. At the same time, the welding method of the conductive part 22 and the pole 12 is not limited, for example, it can be laser welding, and according to factors such as the position, angle, or structure of the welding part, vertical welding, inclined welding, lap welding, or edge welding can be selected. In other embodiments of the present application, the conductive part 22 and the pole 12 can also be electrically connected by other means instead of welding, such as by providing conductive glue or conductive nails. To simplify the description, the following text will take the case where the conductive part 22 and the pole 12 are welded to form an electrical connection, and the welding position is the electrical connection position of the conductive part 22 and the pole 12 as an example for introduction.

[0203] Specifically, the electrode 12 includes a first end wall 12111 and a first side wall 12113. The first end wall 12111 is located on a side of the first side wall 12113 away from the active material coating portion 21. The first end wall 12111 and the first side wall 12113 enclose a first receiving groove 12110. The electrical connection position between the conductive portion 22 and the electrode 12 is located on the first end wall 12111 and / or the first side wall 12113. In other words, the conductive portion 22 can be welded to at least one of the first end wall 12111 and the first side wall 12113.

[0204] In the above technical solution, by arranging the electrical connection position between the conductive portion 22 and the terminal 12 on at least one of the first end wall 12111 and the first side wall 12113, the first receiving groove 12110 not only serves to accommodate at least a portion of the conductive portion 22, but the groove wall of the first receiving groove 12110 also serves to establish an electrical connection with the conductive portion 22. This simplifies the structure of the terminal 12, facilitates the processing of the terminal 12, simplifies the structure of the conductive portion 22, reduces redundancy in the conductive portion 22, and reduces the cost of the conductive portion 22. Furthermore, by utilizing the groove wall of the first receiving groove 12110 to establish an electrical connection with the conductive portion 22, the area where the conductive portion 22 is electrically connected to the terminal 12 can be set relatively large, which not only reduces the difficulty of electrical connection, but also improves the reliability and stability of the electrical connection, thereby improving the performance of the battery cell 10.

[0205] In addition, since the electrical connection position between the conductive part 22 and the pole 12 is located in the first receiving groove 12110, it can not only prevent the electrical connection position from protruding from the outside of the pole 12 and occupying the space outside the pole 12, but also enable the electrical connection position to be protected by the pole 12, thereby improving the reliability and stability of the electrical connection between the conductive part 22 and the pole 12.

[0206] In addition, in an embodiment of the present application, the first end wall 12111 is constructed as a closed structure without any perforations, so that the first receiving tank 12110 is isolated from the external space of the shell 11, thereby avoiding the problem of the electrolyte in the shell 11 leaking from the first receiving tank 12110.

[0207] Referring again to Figures 22 and 23, in some optional embodiments, the shape of a portion of the conductive portion 22 matches the shape of a portion of the first end wall 12111, and the conductive portion 22 is positioned in a manner that conforms to and electrically connects to the first end wall 12111, such that the portion where the conductive portion 22 electrically connects to the first end wall 12111 extends along the length or width of the first end wall 12111. For example, when the first end wall 12111 is planar, a portion of the conductive portion 22 can also be planar and conform to the first end wall 12111, and an electrical connection, such as welding, can be made at the conforming portion. This can increase the area of ​​the electrical connection, improving the reliability and stability of the electrical connection.

[0208] In addition, when the electrical connection between the conductive part 22 and the first end wall 12111 is welding, since the first end wall 12111 is located on the side of the first receiving groove 12110 away from the active material coating part 21, it is convenient to perform welding operations. For example, welding can be performed from the side of the pole 12 away from the active material coating part 21.

[0209] It is worth noting that the shape of the first end wall 12111 is not limited, and can be, for example, a flat plate, an arc-shaped plate, etc. Specifically, when the first end wall 12111 is a flat plate structure, the first end wall 12111 is arranged at an angle to the axial direction R of the pole 12. For example, the first end wall 12111 can be a flat plate structure perpendicular to the axial direction R of the pole 12, or can be an inclined plate structure that is not perpendicular to the axial direction R of the pole 12, but the inclination direction is not limited.

[0210] Of course, in other embodiments of the present application, the position where the conductive part 22 is electrically connected to the first end wall 12111 may not extend along the length or width direction of the first end wall 12111. For example, it may be a plurality of discretely arranged points. For example, the conductive part 22 has a plurality of spaced-apart parts that are respectively welded to the first end wall 12111, which will not be elaborated here.

[0211] Please refer to Figure 24, which is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. When the conductive portion 22 is electrically connected to the first end wall 12111, a first sinking groove 12112 can be provided on the first end wall 12111, and the sinking direction of the first sinking groove 12112 is away from the active material coating portion 21. At least a portion of the position where the conductive portion 22 is electrically connected to the first end wall 12111 is located within the first sinking groove 12112. For example, at least a portion of the conductive portion 22 can be provided within the first sinking groove 12112 and connected to the portion of the first end wall 12111 that is used to define the first sinking groove 12112.

[0212] In the above technical solution, on the one hand, the first sinking groove 12112 can be used to realize pre-positioning and limiting of the electrical connection position of the conductive part 22, which is not only conducive to finding the correct position to realize electrical connection and improve production efficiency, but also helps to improve the stability and reliability of the conductive part 22, and ensure the stability and reliability of the battery cell 10 during the charging and discharging process; on the other hand, by arranging the first sinking groove 12112 on the first end wall 12111, the local wall thickness of the first end wall 12111 can be locally thinned, which is not only conducive to welding, but also helps to reduce the weight of the pole 12 and improve the weight energy density of the battery cell 10.

[0213] Please refer to Figures 23 and 24 again. In the embodiment of the present application, the pole 12 can also be provided with a first groove 126 as needed. The first groove 126 is located on the side of the pole 12 away from the active material coating portion 21, that is, the surface of the side of the pole 12 away from the active material coating portion 21 is the pole outer end face 123, and the notch of the first groove 126 is formed on the pole outer end face 123.

[0214] It is understood that the first groove 126 is a groove body, which is a groove-like structure with a certain depth. Furthermore, when the pole 12 is arranged on the upper end wall of the housing 11 and the pole outer end surface 123 is the upper surface of the pole 12, the first groove 126 is formed as a first groove with a groove opening open upward and the groove wall recessed downward (i.e., recessed toward the square near the battery cell assembly 2). For another example, when the pole 12 is arranged on the lower end wall of the housing 11 and the pole outer end surface 123 is the lower surface of the pole 12, the first groove 126 is formed as a first groove with a groove opening open downward and the groove wall recessed upward (i.e., recessed toward the square away from the battery cell assembly 2).

[0215] In the above technical solution, on the one hand, since the pole 12 is provided with the first groove 126, the weight of the pole 12 can be further reduced, so as to improve the weight energy density of the battery cell 10 and the battery 100; on the other hand, the first groove 126 is located on the outside of the pole 12, that is, it is open to the side of the pole 12 away from the interior of the shell 11. The first groove 126 can be used to accommodate or install structural components in the battery 100 that electrically connect the various battery cells 10, so as to make full use of the space inside the pole 12 and improve the space utilization and volume energy density of the battery 100.

[0216] In addition, since the terminal 12 has both the first receiving groove 12110 and the first groove 126, the first groove 126 is located on the side of the first receiving groove 12110 away from the active material coating portion 21, and the first groove 126 is open in a direction away from the first receiving groove 12110. This facilitates laser welding of the conductive portion 22 to the first end wall 12111 through the first groove 126 from the outside of the terminal 12, that is, the side of the terminal 12 away from the active material coating portion 21, thereby facilitating electrical connection between the conductive portion 22 and the terminal 12 through external welding. In other words, the above-mentioned structural arrangement facilitates external welding of the terminal 12 and the conductive portion 22 through the first groove 126, facilitates the processing and manufacturing of the battery cell 10, and can save processing and manufacturing costs.

[0217] Furthermore, in order to conveniently and effectively weld the conductive part 22 to the groove wall of the first receiving groove 12110 through the first groove 126, and improve the welding reliability of the conductive part 22 to the groove wall of the first receiving groove 12110, in an embodiment of the present application, the part between the first groove 126 and the first receiving groove 12110 can be laser welded to the conductive part 22, that is, the spacer part 127 shown in Figure 24 is laser welded to the conductive part 22, so as to realize the electrical connection between the battery cell assembly 2 and the pole 12. The thickness of the spacer 127 of the pole 12 located between the first groove 126 and the first receiving groove 12110 is relatively thin. The spacer 127 isolates the first groove 126 and the first receiving groove 12110. The side wall of the spacer 127 close to the active material coating part 21 can be used as the first end wall 12111. When the conductive part 22 needs to be welded to the first end wall 12111, since the thickness of the spacer 127 is relatively thin, it is conducive to welding the conductive part 22 and the first end wall 12111 through the first groove 126, thereby improving the convenience and reliability of welding.

[0218] In some embodiments, the first receiving groove 12110 can be configured with a cross-sectional shape whose length is greater than its width, such as a rectangle, an ellipse, a racetrack, or the like. The weld mark formed by welding the conductive portion 22 to the electrode 12 can be a long, strip-shaped weld mark parallel to the length of the first receiving groove 12110, thereby improving welding reliability and enhancing current flow performance. For example, when the weld mark formed by welding the conductive portion 22 to the first end wall 12111 is a long, strip-shaped weld mark, the width of the weld mark can be greater than or equal to 6 mm, and the distance between the weld mark and the first side wall 12113 can be greater than or equal to 1 mm, thereby ensuring welding convenience and reliability while also ensuring the current flow capacity of the battery cell 10.

[0219] Please refer to FIG. 23 again. Furthermore, the battery cell 10 may further include a slot cover 7 . The slot cover 7 is disposed on the terminal post 12 and covers the notch of the first groove 126 .

[0220] In the above technical solution, by providing a slot cover 7 that covers the first groove 126, the terminal 12 can achieve indirect electrical connection with the busbar through the slot cover 7. By adjusting the position and structure of the slot cover 7, the electrical connection between the slot cover 7 and the busbar is more convenient and the electrical connection area is larger. Therefore, the provision of the slot cover 7 facilitates the electrical connection between adjacent battery cells 10 in the battery 100. Since the location where the battery cells 10 are electrically connected to each other is located on the slot cover 7, it is separated from the electrical connection location between the conductive portion 22 and the terminal 12 by the first groove 126, reducing interference between the two and further improving the stability and reliability of the battery cells 10.

[0221] For example, please refer to Figure 25, which is a partial cross-sectional schematic diagram of the battery cell 10 provided in some embodiments of the present application. The accommodating portion 121 can also be configured to include a second accommodating groove 12120. The surface of the pole 12 away from the active material coating portion 21 is the pole outer end face 123. The notch of the second accommodating groove 12120 is formed on the pole outer end face 123. The second accommodating groove 12120 is connected to the interior of the shell 11 through the through hole 12130. The conductive portion 22 is arranged in the through hole 12130 and is at least partially accommodated in the second accommodating groove 12120.

[0222] It is understood that the second receiving groove 12120 is a groove body, which is a groove-like structure with a certain depth. For example, when the pole 12 is disposed on the upper end wall of the housing 11 and the pole outer end surface 123 is the upper surface of the pole 12, the second receiving groove 12120 is formed as a receiving groove with an upwardly open groove opening and a downwardly recessed groove wall. For another example, when the pole 12 is disposed on the lower end wall of the housing 11 and the pole outer end surface 123 is the lower surface of the pole 12, the second receiving groove 12120 is formed as a receiving groove with a downwardly open groove opening and an upwardly recessed groove wall.

[0223] In the above technical solution, please refer to Figure 25 again. On the one hand, the pole 12 is provided with a second receiving groove 12120, which can reduce the weight of the pole 12 to a certain extent, so as to improve the weight energy density of the battery cell 10 and the battery 100; on the other hand, since the notch of the second receiving groove 12120 is formed on the outer end face 123 of the pole, and the outer end face 123 of the pole is the surface of the pole 12 away from the active material coating part 21, the second receiving groove 12120 can be open in the direction away from the active material coating part 21. In this way, when at least part of the conductive part 22 is accommodated in the second receiving groove 12120, the conductive part 22 can be easily stored and sorted through the notch of the second receiving groove 12120, and the electrical connection operation between the conductive part 22 and the pole 12 can be easily achieved through the notch of the second receiving groove 12120, thereby reducing the production difficulty of the battery cell 10 and improving the production efficiency of the battery cell 10.

[0224] At the same time, since the second receiving tank 12120 can be connected to the interior of the shell 11 through the perforation 12130, the second receiving tank 12120 can also serve as a buffer and temporary storage structure for the electrolyte, so that more electrolyte can be accommodated in the shell 11. Since the battery cell 10 will lose electrolyte during the charging and discharging process, when there is more electrolyte, the service life of the battery cell 10 can be extended; and because the second receiving tank 12120 can be connected to the interior of the shell 11 through the perforation 12130, the second receiving tank 12120 can also serve as a receiving and buffer structure for gas production inside the battery cell assembly 2, reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0225] It is worth noting that when the accommodation portion 121 has the second accommodation groove 12120 and the conductive portion 22 is disposed in the through hole 12130 and is at least partially accommodated in the second accommodation groove 12120 , the electrical connection position between the conductive portion 22 and the pole 12 is not limited.

[0226] Exemplarily, when the conductive portion 22 is passed through the through-hole 12130 and is at least partially accommodated in the second accommodating groove 12120 , in an embodiment of the present application, the electrical connection position between the conductive portion 22 and the pole 12 is located at the hole wall of the through-hole 12130 formed by the pole 12 .

[0227] In the above technical solution, by setting the electrical connection position between the conductive part 22 and the pole 12 on the hole wall of the through-hole 12130, it is convenient to electrically connect the conductive part 22 and the pole 12 through the second receiving groove 12120. Moreover, when the electrical connection area between the conductive part 22 and the pole 12 is large, the electrical connection between the conductive part 22 and the pole 12 can be used to achieve the sealing of the through-hole 12130, so as to save sealing costs, reduce electrolyte leakage, and save sealing parts.

[0228] Specifically, the conductive part 22 can be welded to the hole wall of the through-hole 12130 at the position where the through-hole 12130 is connected to the second receiving groove 12120, which is convenient for operation. In addition, the through-hole 12130 can be sealed by controlling the weld mark and utilizing the weld mark and the conductive part 22 to improve the problem of electrolyte in the shell 11 leaking from the through-hole 12130.

[0229] As another example, when the conductive portion 22 is provided through the through-hole 12130 and is at least partially accommodated in the second receiving groove 12120, in other embodiments of the present application, the electrical connection position between the conductive portion 22 and the pole 12 may also be located on the groove wall of the second receiving groove 12120 formed by the pole 12. This facilitates the electrical connection operation. For example, when the conductive portion 22 is welded to the groove wall of the second receiving groove 12120 formed by the pole 12, the conductive particles generated by the welding can be prevented from entering the housing 11 and causing problems such as a short circuit.

[0230] Please refer to Figure 25 again. The pole 12 includes a second end wall 12121 and a second side wall 12123. The second end wall 12121 is located on the side of the second side wall 12123 close to the active material coating portion 21. The second end wall 12121 and the second side wall 12123 are arranged to form a second receiving groove 12120. The through hole 12130 is opened on the second end wall 12121. The electrical connection position between the conductive portion 22 and the pole 12 is located on the second end wall 12121 and / or on the second side wall 12123.

[0231] More specifically, the conductive portion 22 and the pole 12 can be electrically connected by welding, so the welding position is the electrical connection position between the conductive portion 22 and the pole 12. In other embodiments of the present application, the conductive portion 22 and the pole 12 can also be electrically connected by other methods instead of welding, such as by providing conductive glue or conductive nails, which will not be described in detail here.

[0232] To simplify the description, the following description uses the example of welding the conductive portion 22 to the pole 12 to form an electrical connection, where the welding location is the electrical connection location between the conductive portion 22 and the pole 12. For example, in some embodiments, the electrical connection location between the conductive portion 22 and the pole 12 is located at the second end wall 12121 and / or the second side wall 12123, and the conductive portion 22 may be welded to at least one of the second end wall 12121 and the second side wall 12123.

[0233] In the above technical solution, by locating the electrical connection point between the conductive portion 22 and the terminal 12 on at least one of the second end wall 12121 and the second side wall 12123, the second receiving groove 12120 not only accommodates at least part of the conductive portion 22, but also the groove wall of the second receiving groove 12120 also functions to achieve electrical connection with the conductive portion 22. This simplifies the structure of the terminal 12 and facilitates the processing of the terminal 12. Furthermore, because the through-hole 12130 is provided in the second end wall 12121, the conductive portion 22 can easily extend into the second receiving groove 12120 through the through-hole 12130, simplifying the structure of the conductive portion 22, reducing redundancy in the conductive portion 22, and lowering the cost of the conductive portion 22. Moreover, the opening direction of the slot of the second receiving groove 12120 makes it easy to electrically connect the conductive part 22 with the slot wall of the second receiving groove 12120 through the slot of the second receiving groove 12120, which can reduce the difficulty of electrical connection. Moreover, by utilizing the slot wall of the second receiving groove 12120 to achieve electrical connection with the conductive part 22, the area where the conductive part 22 is electrically connected to the pole 12 can be relatively large, which can improve the reliability and stability of the electrical connection, thereby improving the performance of the battery cell 10.

[0234] In addition, since the electrical connection position between the conductive part 22 and the pole 12 is located in the second receiving groove 12120, it can not only prevent the electrical connection position from protruding from the outside of the pole 12 and occupying the space outside the pole 12, but also enable the electrical connection position to be protected by the pole 12, thereby improving the reliability and stability of the electrical connection between the conductive part 22 and the pole 12.

[0235] Referring again to FIG. 25 , in some embodiments, the shape of a portion of the conductive portion 22 matches the shape of a portion of the second end wall 12121, and the conductive portion 22 is positioned to fit and electrically connect to the second end wall 12121, such that the portion where the conductive portion 22 is electrically connected to the second end wall 12121 extends along the length or width of the second end wall 12121. For example, if the second end wall 12121 is planar, a portion of the conductive portion 22 can also be planar and fit to the second end wall 12121, and an electrical connection, such as welding, can be made at the fitting portion. This can increase the area of ​​the electrical connection, improving the reliability and stability of the electrical connection.

[0236] It is worth noting that the shape of the second end wall 12121 is not limited, and can be, for example, a flat plate or an arc-shaped plate structure. When the second end wall 12121 is a flat plate structure, it is arranged at an angle to the axial direction R of the pole 12. For example, it can be a flat plate structure perpendicular to the axial direction R of the pole 12, or it can be an inclined flat plate structure that is not perpendicular to the axial direction R of the pole 12, but the inclination direction is not limited.

[0237] For example, referring again to FIG. 25 , when the second end wall 12121 is a flat plate, the angle θ between the second end wall 12121 and the axial direction R of the electrode 12 is equal to 90°. That is, along the direction from the through-hole 12130 to the second side wall 12123, the second end wall 12121 is equidistant from the active material coating portion 21. This facilitates welding of the conductive portion 22 to the second end wall 12121.

[0238] For another example, the angle θ between the second end wall 12121 and the axial direction R of the pole 12 is greater than 90°, that is, along the direction from the through-hole 12130 to the second side wall 12123, the second end wall 12121 extends obliquely toward the direction close to the active material coating portion 21. As a result, the extension distance of the conductive portion 22 along the second end wall 12121 can be increased to increase the reliability of the electrical connection. Exemplarily, the angle θ between the second end wall 12121 and the axial direction R of the pole 12 can be 90°-145°, such as 100°, 110°, 120°, 130°, 140°, etc. On the one hand, this can make the second end wall 12121 easy to process and facilitate electrical connection with the conductive portion 22, and on the other hand, it can more fully utilize the space within the pole 12 to accommodate the conductive portion 22.

[0239] For another example, the angle θ between the second end wall 12121 and the axial direction R of the pole 12 is less than 90°, that is, along the direction from the through-hole 12130 to the second side wall 12123, the second end wall 12121 extends obliquely in the direction away from the active material coating portion 21. As a result, the extension distance of the conductive portion 22 along the second end wall 12121 can be increased to increase the reliability of the electrical connection. Exemplarily, the angle θ between the second end wall 12121 and the axial direction R of the pole 12 can be 45°-90°, such as 50°, 60°, 70°, 80°, etc. On the one hand, this can make the second end wall 12121 easy to process and convenient for electrical connection with the conductive portion 22, and on the other hand, it can make more full use of the space inside the pole 12 to accommodate the conductive portion 22.

[0240] Of course, the present application is not limited to this. In other embodiments of the present application, the position where the conductive part 22 is electrically connected to the second end wall 12121 may not extend along the length or width direction of the second end wall 12121. It may also be a plurality of discretely arranged points. For example, the conductive part 22 has a plurality of spaced-apart parts that are respectively welded to the second end wall 12121, which will not be elaborated here.

[0241] Please refer again to Figure 25 and further to Figure 26, which is a schematic partial cross-sectional view of a battery cell 10 provided in some embodiments of the present application. Regardless of the specific value of the angle θ between the second end wall 12121 and the axial direction R of the terminal 12, in the embodiments of the present application, when the conductive portion 22 is electrically connected to the second end wall 12121, a second recess 12122 can be provided on the second end wall 12121 as required. The second recess 12122 is a groove formed by partially sinking the second end wall 12121 toward the end closest to the active material coating portion. The location where the conductive portion 22 is electrically connected to the second end wall 12121 is at least partially located within the second recess 12122.

[0242] In the above technical solution, the portion of the conductive part 22 located in the second groove 12122 is set to match the shape of the second groove 12122, and is fitted to achieve electrical connection. The second groove 12122 can be used to pre-position and limit the electrical connection position of the conductive part 22, which is conducive to finding the correct position to achieve electrical connection, improve production efficiency, and improve the stability and reliability of the electrical connection position, so as to ensure the reliability and stability of the charging and discharging operations of the battery cell 10.

[0243] Referring again to FIG. 26 , in the embodiment of the present application, the connection method between the pole 12 and the housing 11 is not limited, and can be welding or riveting. For example, when the two are riveted, the housing 11 has a mounting hole 113, and the pole 12 is riveted to the mounting hole 113. Of course, it is understood that when the two are welded or otherwise coupled, the housing 11 may also have a mounting hole 113, and the pole 12 may be mounted to the mounting hole 113.

[0244] Optionally, referring to Figure 25 again, the second accommodating groove 12120 can be set corresponding to the position of the mounting hole 113, or in other words, on the projection plane perpendicular to the axial direction R of the pole 12, the orthographic projection of the second accommodating groove 12120 is located within the orthographic projection range of the mounting hole 113, so that the second accommodating groove 12120 can have a larger depth to accommodate more conductive parts 22, thereby reducing the space occupied by the conductive parts 22 in the shell 11 to a greater extent.

[0245] In some embodiments, please refer to Figure 25 again. When the housing 11 has a mounting hole 113 and the pole 12 is installed in the mounting hole 113, along the axial direction R of the pole 12, the depth H3 of the second accommodating groove 12120 is greater than or equal to the minimum distance H4 from the outer end face 123 of the pole to the mounting hole 113.

[0246] It should be noted that the specific shape of the second receiving groove 12120 is not limited and can be regular or irregular, such as a cylindrical groove with a rectangular, elliptical, or racetrack-shaped cross-section, a trapezoidal groove with a rectangular cross-section and gradually changing cross-sectional dimensions, a hemispherical groove with a circular cross-section and gradually changing cross-sectional dimensions, or a hemispherical groove with an elliptical cross-section and gradually changing cross-sectional dimensions, etc. It is worth noting that the racetrack shape described herein refers to a shape in which the two short sides of a rectangle are replaced by convex curves.

[0247] Therefore, the depth H3 of the second receiving groove 12120 refers to the maximum depth of the second receiving groove 12120 along the axial direction R of the pole 12. Since the depth H3 of the second receiving groove 12120 is greater than or equal to the minimum distance H4 between the pole outer end surface 123 and the mounting hole 113 in the axial direction R of the pole 12, the volume of the pole 12 can be fully utilized, so that the second receiving groove 12120 has a greater depth, which is conducive to accommodating more conductive parts 22, thereby greatly reducing the space occupied by the conductive parts 22 in the housing 11, further improving the energy density of the battery cell 10, and further reducing the redundancy of the conductive parts 22 in the housing 11. At the same time, since the second receiving groove 12120 has a greater depth, it can also accommodate gas generation of the battery cell 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.

[0248] Please refer to Figure 36, and further refer to Figures 27 and 28. Figure 27 is a partial cross-sectional schematic diagram of the battery cell 10 provided in some embodiments of the present application, and Figure 28 is a structural explosion diagram of the battery cell 10 shown in Figure 27. In the embodiments of the present application, when the accommodating portion 121 has the second accommodating groove 12120 of any of the above-mentioned embodiments, optionally, the battery cell 10 may further include a first cover plate 13, the first cover plate 13 cooperates with the pole 12, and closes the notch of the second accommodating groove 12120, and the first cover plate 13 is electrically connected to the pole 12.

[0249] In the above technical solution, by providing the first cover plate 13 to close the notch of the second receiving tank 12120, the electrolyte in the shell 11 can be prevented from leaking from the notch of the second receiving tank 12120. Moreover, since the first cover plate 13 closes the notch of the second receiving tank 12120 and is electrically connected to the pole 12, the first cover plate 13 can be used to easily realize the indirect electrical connection between the pole 12 and the busbar component, and it is beneficial to increase the connection area of ​​the electrical connection, thereby helping to reduce the resistance of the electrical connection.

[0250] It is worth noting that the manner and position of engagement between the first cover plate 13 and the terminal 12 are not limited, as long as the first cover plate 13 can seal the notch of the second receiving slot 12120. For example, in some embodiments, the first cover plate 13 can be welded to the terminal 12. During processing, the conductive portion 22 can first be passed through the through-hole 12130 and welded to the wall of the second receiving slot 12120. The first cover plate 13 and the terminal 12 are then welded to seal the notch of the second receiving slot 12120.

[0251] It should also be noted that the specific structure of the first cover plate 13 is not limited. For example, in some optional embodiments, FIG29 is an exploded view of the structure of the first cover plate shown in FIG28 . Referring to FIG27-29 , the first cover plate 13 includes a first conductive member 131 and a second conductive member 132 made of different materials. The first conductive member 131 is engaged with and electrically connected to the pole 12, and the second conductive member 132 is engaged with and electrically connected to the first conductive member 131.

[0252] In the above technical solution, the first cover plate 13 is configured as a composite form, and the first conductive member 131 is configured to be made of the same material as the pole 12, thereby facilitating electrical connection between the first conductive member 131 and the pole 12. For example, the first conductive member 131 can be easily and stably connected to the pole 12 through welding. In addition, because the second conductive member 132 is made of a different material from the first conductive member 131, it is convenient to use the second conductive member 132 to electrically connect to a busbar component made of a different material from the pole 12. For example, the second conductive member 132 can be easily and stably connected to a busbar component made of the same material as the second conductive member 132 through welding.

[0253] For example, when the electrode 12 is a negative electrode, the electrode 12 is a copper electrode, and the current collector is an aluminum sheet, the first conductive member 131 can be set to copper, and the second conductive member 132 can be set to aluminum. In this case, the electrode 12 and the first conductive member 131 are made of the same material and can be effectively welded, and the second conductive member 132 and the current collector are made of the same material and can be effectively welded, thereby effectively achieving an indirect electrical connection between the electrode 12 and the current collector through the first cover 13. Moreover, the copper-to-copper welding of the electrode 12 and the first conductive member 131 has good fluidity and is less likely to crack, which helps to improve the sealing effect of the weld.

[0254] Referring again to Figures 27-29, in some optional examples, the first conductive member 131 is located between the second receiving groove 12120 and the second conductive member 132. In the above technical solution, since the first conductive member 131 is located between the second receiving groove 12120 and the second conductive member 132, it can separate the second receiving groove 12120 from the second conductive member 132. Therefore, when the electrolyte in the housing 11 enters the second receiving groove 12120 through the through-hole 12130, the first conductive member 131 can prevent this portion of the electrolyte from contacting the second conductive member 132, thereby solving the problem of electrolyte corrosion on the second conductive member 132.

[0255] It is worth noting that the coupling method between the first conductive member 131 and the second conductive member 132 is not limited. For example, in some embodiments, referring to Figures 27-29, the first conductive member 131 has a second groove 1311, and the second conductive member 132 is embedded in the second groove 1311. The notch of the second groove 1311 is formed on the surface of the first conductive member 131 away from the second receiving slot 12120, so that the second conductive member 132 is exposed through the notch of the second groove 1311. Alternatively, in other embodiments, the connection method between the first conductive member 131 and the second conductive member 132 can also be a fastening connection, a snap connection, etc.

[0256] It should also be noted that the "exposed" of the second conductive member 132 by the notch of the second groove 1311 means that the first conductive member 131 does not block the second conductive member 132 at the notch position of the second groove 1311, and the second conductive member 132 is not required to protrude from the notch of the second groove 1311. For example, the second conductive member 132 can be flush with the surface of the first conductive member 131 on the side away from the second accommodating groove 12120, or the second conductive member 132 can protrude from the surface of the first conductive member 131 on the side away from the second accommodating groove 12120.

[0257] In the above technical solution, on the one hand, by embedding the second conductive member 132 within the first conductive member 131, the difficulty of assembling the first and second conductive members 131, 132 can be reduced, the stability and convenience of the cooperation between the first and second conductive members 131, 132 can be improved, and the thickness of the first cover plate 13 can be reduced, reducing the space occupied by the first cover plate 13, thereby improving the space utilization of the battery cell 10. On the other hand, because the second conductive member 132 can be exposed from the surface of the first conductive member 131 on the side away from the second receiving groove 12120 through the notch of the second groove 1311, it is convenient to achieve electrical connection between the second conductive member 132 and the current collecting component outside the terminal 12.

[0258] In addition, since the notch of the second groove 1311 is formed on the surface of the first conductive member 131 on the side away from the second receiving groove 12120, it means that the second groove 1311 is open in the direction away from the active material coating portion 21, so that the portion of the groove wall of the first conductive member 131 used to define the second groove 1311 is located between the second receiving groove 12120 and the second conductive member 132 to separate the second receiving groove 12120 and the second conductive member 132, thereby preventing the electrolyte entering the second groove 1311 from contacting the second conductive member 132, thereby reducing leakage of the electrolyte.

[0259] Of course, in other embodiments, the first cover plate 13 may not be a composite form composed of multiple materials. For example, in other embodiments of the present application, Figure 30 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application, and Figure 31 is a structural explosion diagram of the battery cell shown in Figure 30. Please refer to Figures 30 and 31. The first cover plate 13 as a whole may also be set to a non-composite form made of the same material, for example, for adapting to the positive electrode column, which will not be elaborated here.

[0260] Referring again to Figures 27-29, in some embodiments, the first cover plate 13 is further embedded in the notch of the second receiving groove 12120. In the above technical solution, by embedding the first cover plate 13 in the second receiving groove 12120, the difficulty of assembling the first cover plate 13 and the pole 12 can be reduced, the assembly stability of the first cover plate 13 and the pole 12 can be improved, as well as the reliability and convenience of the connection. It can also reduce the space occupied by the first cover plate 13 outside the pole 12. Moreover, because the first cover plate 13 is embedded in the notch of the second receiving groove 12120, there is sufficient space in the second receiving groove 12120 to accommodate the conductive portion 22.

[0261] Of course, in other embodiments of the present application, the cooperation manner of the first cover plate 13 and the pole 12 is not limited to being embedded in the second receiving groove 12120. The first cover plate 13 can also be directly covered on the outside of the pole 12, that is, directly covered at the notch of the second receiving groove 12120, so as to facilitate cooperation with the convergence component of the battery 100. This is not limited in this embodiment.

[0262] Referring again to Figures 27-29, optionally, in an embodiment of the present application, at least a portion of the wall surface at the notch of the second receiving groove 12120 of the pole 12 is formed as a guiding slope 12126. The guiding slope 12126 is used to guide the first cover plate 13 to mate with the notch of the second receiving groove 12120. In the above technical solution, by processing the wall surface at the notch of the second receiving groove 12120 into a guiding slope, the difficulty of assembling the first cover plate 13 and the second receiving groove 12120 can be reduced, and the efficiency of assembling the first cover plate 13 and the second receiving groove 12120 can be improved. Moreover, when the first cover plate 13 is welded to the guiding slope 12126, the area of ​​the weld can be increased, improving the reliability of the weld connection between the first cover plate 13 and the pole 12, and alleviating the problems of molten pool collapse or laser penetration into the pole 12 during welding.

[0263] Specifically, referring to Figures 27-29, the second receiving groove 12120 includes a first groove section 12124 and a second groove section 12125 located on a side of the first groove section 12124 closer to the pole outer end surface 123. The cross-sectional area of ​​the second groove section 12125 is larger than that of the first groove section 12124, giving the second receiving groove 12120 a stepped groove shape. Furthermore, a third step surface 12127 is formed at the junction of the first groove section 12124 and the second groove section 12125. This allows the first cover plate 13, when embedded in the second receiving groove 12120, to be embedded in the second groove section 12125 and supported by the third step surface 12127.

[0264] In the above technical solution, by setting the second accommodating groove 12120 as a stepped groove form, the first cover plate 13 can be stably fitted in the groove position of the second accommodating groove 12120, thereby improving the connection stability between the first cover plate 13 and the pole 12, and by limiting the groove depth of the first groove section 12124, there is relatively sufficient space in the second accommodating groove 12120 to accommodate the conductive part 22.

[0265] Furthermore, when the wall surface at the slot of the second accommodating slot 12120 formed by the pole 12 is a guide slope 12126, the cross-sectional area of ​​the second slot segment 12125 can be set to gradually increase in the direction approaching the outer end face 123 of the pole, so that the side wall of the second slot segment 12125 is formed as a guide slope 12126, thereby facilitating processing and simply and effectively meeting the guidance requirements.

[0266] Referring again to Figures 27-29, in the embodiment of the present application, the first cover plate 13 may further include stress relief grooves 133 as needed. The stress relief grooves 133 are located in the outer peripheral area of ​​the first cover plate 13 to assist in stress relief for the first cover plate 13. In the above technical solution, by providing the stress relief grooves 133 on the first cover plate 13, stress generated during the processing of the first cover plate 13 itself or during the electrical connection between the first cover plate 13 and the terminal 12 can be relieved, thereby improving issues such as deformation or damage to the first cover plate 13 caused by stress.

[0267] Specifically, when the first cover plate 13 and the second receiving groove 12120 are embedded and welded, the stress relief groove 133 can be used to release the stress generated by the welding, improve the transverse heat conduction, and reduce the probability of damage or deformation of the first cover plate 13. At the same time, when the first cover plate 13 is a composite form including the first conductive member 131 and the second conductive member 132, the stress relief groove 133 can be set on the first conductive member 131 and located in the peripheral area of ​​the second conductive member 132. When the first conductive member 131 and the second receiving groove 12120 are embedded and welded, the stress relief groove 133 can be used to release the stress generated by the welding, improve the transverse heat conduction, and reduce the probability of damage or deformation of the second conductive member 132. Moreover, when the second conductive member 132 and the first conductive member 131 are embedded and welded, the stress relief groove 133 can be used to release the stress generated by the welding, improve the transverse heat conduction, and reduce the probability of deformation of the first conductive member 131, which may result in the first conductive member 131 being unable to be embedded in the second receiving groove 12120.

[0268] 30-31 , in the embodiment of the present application, the battery cell 10 may further be provided with a second cover plate 14 as required. The second cover plate 14 is disposed outside the through hole 12130 and is also located outside the conductive portion 22 in the second receiving groove 12120 .

[0269] It is worth noting that when the battery cell 10 includes the second cover plate 14, the battery cell 10 may also include the first cover plate 13, or may not include the first cover plate 13. Furthermore, when the battery cell 1 includes both the second cover plate 14 and the first cover plate 13, the first cover plate 13 may be a composite form made of multiple materials, or may be a non-composite form made of the same material.

[0270] In the above technical solution, at least part of the conductive part 22 is located in the second receiving groove 12120, and the second cover plate 14 covers the conductive part 22 of this part. The second cover plate 14 also covers the through-hole 12130, so that when the electrolyte enters the second receiving groove 12120 from the through-hole 12130, the second cover plate 14 can improve the problem of overflow of this part of the electrolyte from the pole 12, thereby improving the reliability of the battery cell 10.

[0271] For example, as shown in Figures 30 and 31, when a portion of the conductive portion 22 is sandwiched between the second cover plate 14 and the second end wall 12121, laser welding can be used to weld the portion of the conductive portion 22, the second cover plate 14, and the second end wall 12121 together to improve the reliability of the connection between the terminal 12 and the conductive portion 22. Furthermore, because the second cover plate 14 can compress the conductive portion 22, the second cover plate 14 can be used to improve the stability of the conductive portion 22 within the second receiving groove 12120.

[0272] Please refer to Figure 32, which is an assembly diagram of a battery cell 10 according to some embodiments of the present application. The housing 111 has one opening 1110, which is covered by the housing cover 112. The bracket 3 is located at the end of the battery cell assembly 2 away from the opening 1110.

[0273] The opening 1110 can be located on the top wall, bottom wall, or side wall of the shell 111. When the opening 1110 is located on the bottom wall of the shell 111, the remaining walls are all closed structures. The battery cell assembly 2 with the bracket 3 and the insulating member 4 can only be installed into the shell 111 through the opening 1110. After the battery cell assembly 2 is installed in place in the shell 111, the shell cover 112 is closed on the opening 1110 to seal the opening 1110. The insulating member 4 is pressed between the top wall of the shell 111 and the bracket 3, which can reduce the risk of the insulating member 4 falling off, reduce the risk of the battery cell assembly 2 failing due to leakage, and reduce the risk of corrosion of the shell 11, thereby improving the reliability and stability of the battery cell 10.

[0274] In the above technical solution, an opening 1110 is provided on the shell body 111, and the bracket 3 is provided at the end of the battery cell assembly 2 away from the opening 1110. The battery cell assembly 2 with the bracket 3 and the insulating part 4 can only be installed into the shell body 111 from the opening 1110. The shell entry direction is unique, which is conducive to improving the installation efficiency. The shell 11 will not scratch the edge of the insulating part 4, nor will it scratch the connection position between the insulating part 4 and the bracket 3. The connection reliability between the insulating part 4 and the bracket 3 can be improved, and the risk of the insulating part 4 falling off can be reduced. In addition, the risk of the shell 11 being corroded due to leakage of the battery cell assembly 2 can be reduced, the risk of failure of the battery cell assembly 2 itself can be reduced, and the risk of leakage can be reduced, thereby improving the reliability and stability of the battery single unit 10.

[0275] Optionally, all poles 12 may be provided on the shell cover 112 , that is, all poles 12 are located on the side of the battery cell assembly 2 away from the bracket 3 , and the conductive portion 22 may be electrically connected to the corresponding poles 12 on the shell cover 112 .

[0276] Optionally, one of the poles 12 may be provided on the housing cover 112 , and the other pole 12 may be provided on the end wall of the housing body 111 opposite to the opening 1110 , and one of the conductive portions 22 may be electrically connected to the pole 12 on the housing cover 112 .

[0277] Optionally, all poles 12 may be provided on the end wall of the shell body 111 opposite to the opening 1110 , and the conductive portion 22 may pass through the bracket 3 and be electrically connected to the corresponding poles 12 on the end wall of the shell body 111 .

[0278] Referring again to Figure 32 , the housing 111 has a mounting wall 1112 opposite the opening 1110, with at least one terminal 12 disposed on the mounting wall 1112. In this manner, the battery cell assembly 2 enters the housing 111 through the opening 1110, with the conductive portion 22 directly facing the terminal 12. This allows for easier connection between the conductive portion 22 and the terminal 12, improving assembly efficiency of the battery cell 10.

[0279] Exemplarily, the top wall of the shell body 111 is the installation wall 1112, the bottom wall of the shell body 111 has an opening 1110, and the shell cover 112 is arranged at the bottom of the shell body 111. The battery cell assembly 2 can be installed into the shell body 111 from bottom to top along the Z direction, so that the conductive part 22 can be easily connected to the pole 12.

[0280] Please refer to Figure 33, which shows an assembly diagram of a battery cell 10 according to another embodiment of the present invention. There are two openings 1110 on the shell 111, each of which is covered by a shell cover 112. The bracket 3 is located at the end of the battery cell assembly 2 away from any opening 1110.

[0281] In the above technical solution, two openings 1110 are provided on the shell body 111, and a bracket 3 is provided at one end of the battery cell assembly 2 away from any opening 1110. The battery cell assembly 2 with two brackets 3 and an insulating member 4 can be loaded into the shell body 111 from any opening 1110, and a suitable shell insertion direction can be selected as needed. After the battery cell assembly 2 is installed in place in the shell body 111, a portion of the insulating member 4 can be pressed between the wall of the shell body 111 opposite to one of the openings 1110 and the corresponding bracket 3, and another portion of the insulating member 4 can be pressed between the wall of the shell body 111 opposite to the other opening 1110 and the corresponding bracket 3, thereby further reducing the risk of the insulating member 4 falling off, reducing the risk of the battery cell assembly 2 failing due to leakage, and at the same time reducing the risk of the shell 11 being corroded, thereby improving the reliability and stability of the battery cell 10.

[0282] The two openings 1110 may be located on the top wall, bottom wall, or side wall of the shell body 111. The two openings 1110 may be provided on two oppositely disposed walls of the shell body 111, for example, the two openings 1110 may be provided on the top wall and the bottom wall of the shell body 111, respectively. For another example, the two openings 1110 may be provided on two oppositely disposed side walls of the shell body 111, respectively. The two openings 1110 may also be provided on two adjacently disposed walls of the shell body 111, for example, the two openings 1110 may be provided on the adjacent top wall and side wall of the shell body 111, respectively. For another example, the two openings 1110 may be provided on the adjacent bottom wall and side wall of the shell body 111, respectively. For another example, the two openings 1110 may be provided on the adjacent side walls of the shell body 111, respectively.

[0283] When the two openings 1110 are respectively provided on two oppositely disposed walls of the shell body 111, the remaining walls are all closed structures, one opening 1110 is covered by the first shell cover 1121, and the other opening 1110 is covered by the second shell cover 1122. All the poles 12 can be provided on the first shell cover 1121, or all the poles 12 can be provided on the second shell cover 1122, or a part of the poles 12 can be provided on the first shell cover 1121 or the second shell cover 1122, and the other part of the poles 12 can be provided on the shell body 111.

[0284] Please refer to Figure 33 again. A pole 12 is respectively provided on the first shell cover 1121 and the second shell cover 1122. A bracket 3 is provided at both ends of the battery cell assembly 2. The battery cell assembly 2 with the bracket 3 and the insulating member 4 can be installed into the shell body 111 from any opening 1110. After the battery cell assembly 2 is installed in place in the shell body 111, the two shell covers 112 are respectively covered on the two openings 1110 to seal the corresponding openings 1110. After the battery cell assembly 2 with the two brackets 3 is put into the shell, one of the conductive parts 22 passes through one bracket 3 and is electrically connected to the pole 12 on the first shell cover 1121, and the other conductive part 22 passes through the other bracket 3 and is electrically connected to the pole 12 on the second shell cover 1122.

[0285] In some embodiments, at least one terminal post 12 is disposed on the side of the housing 11 adjacent to the bracket 3. The battery cell assembly 2 with the bracket 3 and the insulating member 4 enters the housing 111 through the opening 1110. The conductive portion 22 directly faces the terminal post 12, making it easier for the conductive portion 22 to connect with the terminal post 12, thereby improving the assembly efficiency of the battery cell 10.

[0286] Please refer to FIG. 3 to FIG. 6 again to describe the battery cell 10 according to a specific embodiment of the present application.

[0287] In the embodiment of the present application, the battery cell 10 is a rectangular parallelepiped. The height of the battery cell 10 is in the first direction Z, the length of the battery cell 10 is in the second direction X, and the thickness of the battery cell 10 is in the third direction Y. The battery cell 10 includes a housing 11, which comprises a body 111 and a cover 112. The body 111 is a square ring-shaped structure, with one end of the body 111 open along the first direction Z and the other end closed along the first direction Z. The cover 112 is disposed over the open portion of the body 111. Two electrodes 12 are provided at the closed end of the body 111 along the first direction Z. The two electrodes 12 are spaced apart along the second direction X to form a positive electrode and a negative electrode, respectively.

[0288] Both poles 12 are provided with an accommodating portion 121, and the accommodating portion 121 includes a second accommodating groove 12120. Specifically, the first pole 12 includes a second end wall 12121 and a second side wall 12123. The second end wall 12121 is located on the side of the second side wall 12123 close to the shell cover 112. The second end wall 12121 and the second side wall 12123 are arranged to form the second accommodating groove 12120. The surface of the first pole 12 away from the shell cover 112 is the pole outer end face 123. The notch of the second accommodating groove 12120 is formed on the pole outer end face 123, and a through hole 12130 is opened on the second end wall 12121.

[0289] The battery cell 10 also includes a cell assembly 2, a bracket 3 and an insulating member 4. The cell assembly 2 includes an active material coating portion 21 and a conductive portion 22. The active material coating portion 21 is accommodated in the shell 11. The bracket 3 is arranged at one end of the active material coating portion 21, and the bracket 3 is located between the closed end of the shell body 111 along the first direction Z and the active material coating portion 21. The bracket 3 has two through holes 311, and the two through holes 311 are spaced apart along the second direction X.

[0290] The bracket 3 has a main body 36 and an extension portion 37. The extension portion 37 is arranged on the peripheral side of the main body 36. The projection of the main body 36 on the plane of the shell cover 112 is located within the projection of the active material coating portion 21 on the plane of the shell cover 112. The projection of the extension portion 37 on the plane of the shell cover 112 is located outside the projection of the active material coating portion 21 on the plane of the shell cover 112.

[0291] In the technical solution of the embodiment of the present application, an independent bracket 3 is used to replace the plastic part embedded under the top cover in the related technology, and the bracket 3 is matched with the battery cell assembly 2 and then inserted into the shell together. In the process of installing the battery cell assembly 2 with the bracket 3 into the shell 11, the bracket 3 can not only constrain the active material coating part 21, but also the extension part 37 can protect the active material coating part 21, reduce the probability of the active material coating part 21 touching the shell 11, and minimize the occurrence of the shell 11 scratching the active material coating part 21, thereby improving the reliability of the battery cell 10, and the installation steps are simple, which is conducive to improving production efficiency.

[0292] According to some embodiments of the present application, the present application further provides a battery 100 comprising the battery cell 10 described in any of the above solutions.

[0293] In the above technical solution, since the battery 100 is provided with the above-mentioned battery cell 10, the bracket 3 can not only constrain the active material coating portion 21, but also the extension portion 37 can protect the active material coating portion 21, thereby reducing the probability of the active material coating portion 21 touching the shell 11, and minimizing the occurrence of the shell 11 scratching the active material coating portion 21, thereby improving the reliability of the battery 100, and the installation steps are simple, which is conducive to improving production efficiency.

[0294] According to some embodiments of the present application, the present application further provides an electric device 1000 , comprising the battery 100 described in the above solution, and the battery 100 is used to provide electrical energy to the electric device 1000 .

[0295] In the above technical solution, since the power consumption device 1000 is provided with the above-mentioned battery 100, the operating reliability and stability of the battery 100 can be improved, and thus the operating reliability and stability of the power consumption device 1000 can be improved. It can be understood that when the power consumption device 1000 is a vehicle, the longer service life of the battery 100 is beneficial to improving the vehicle's range.

[0296] The power-consuming device 1000 may be any of the aforementioned devices or systems using the battery 100 .

[0297] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0298] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell (10), wherein: include: A housing (11) comprising a housing cover (112) and a housing body (111) having an opening (1110), wherein the housing cover (112) covers the opening (1110); A battery cell assembly (2) comprising an active material coating portion (21), wherein the active material coating portion (21) is disposed in the housing (11); A bracket (3) is arranged at an end of the active material coating portion (21) away from the opening (1110) and cooperates with the battery core assembly (2); The bracket (3) comprises a main body (36) and an extension portion (37) arranged on the periphery of the main body (36), the projection of the main body (36) on the plane of the shell cover (112) is located inside the projection of the active material coating portion (21) on the plane of the shell cover (112), and the projection of the extension portion (37) on the plane of the shell cover (112) is located outside the projection of the active material coating portion (21) on the plane of the shell cover (112).

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

3. The battery cell (10) according to claim 2, wherein: The extension 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 extension portion (37) facing away from the shell cover (112) has a guide surface (35), and the guide surface (35) includes a curved surface and / or a sloped surface.

5. The battery cell (10) according to any one of claims 1 to 4, wherein: The bracket (3) is clamped or bonded to the battery core assembly (2).

6. The battery cell (10) according to any one of claims 1 to 4, wherein: A limiting convex portion (38) is provided on one side of the extension portion (37) close to the shell cover (112), and the bracket (3) is clamped with the active material coating portion (21) via the limiting convex portion (38).

7. The battery cell (10) according to claim 6, wherein: A surface of the limiting protrusion (38) facing the active material coating portion (21) comprises: a first surface (381), the first surface (381) being in contact with a side wall of the active material coating portion (21); and / or, The second surface (382) is configured such that the distance between the second surface (382) and the active material coating portion (21) gradually increases along a direction from the bracket (3) to the opening (1110).

8. The battery cell (10) according to any one of claims 1 to 7, wherein: The battery cell (10) further comprises: An insulating member (4), wherein the insulating member (4) wraps the active material coating portion (21) and is connected to the extending portion (37).

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

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

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

12. The battery cell (10) according to any one of claims 1 to 7, wherein: The battery cell (10) further comprises: An insulating member (4), the insulating member (4) wraps the active material coating portion (21) and is connected to a surface of the main body (36) away from the shell cover (112).

13. The battery cell (10) according to any one of claims 1 to 12, wherein: The shell (11) is provided with a pole (12); the battery cell assembly (2) also includes a conductive part (22), the conductive part (22) is connected to a side of the active material coating part (21) close to the main body (36), the main body (36) has a through hole (311), and the conductive part (22) passes through the through hole (311) to be connected to the pole (12).

14. The battery cell (10) according to claim 13, wherein: The bracket (3) is an integrated structure; or, the bracket (3) is a split structure and comprises a first bracket (33) and a second bracket (34) that are separately formed, and the through hole (311) is defined between the first bracket (33) and the second bracket (34).

15. The battery cell (10) according to claim 13, wherein: A receiving groove (393) communicating with the via hole (311) is provided on a side of the main body (36) facing away from the active material coating portion (21), and the receiving groove (393) is used to receive at least part of the pole (12).

16. The battery cell (10) according to claim 13, wherein: A positioning portion (32) is provided on a side of the main body (36) that is away from the active material coating portion (21); the positioning portion (32) is arranged around the via hole (311) and extends in a direction close to the pole (12).

17. The battery cell (10) according to claim 16, wherein: The pole (12) is provided with a receiving portion (121), at least a portion of the conductive portion (22) is received in the receiving portion (121), and at least a portion of the positioning portion (32) extends into the receiving portion (121).

18. The battery cell (10) according to claim 13, wherein: A guide groove (312) connected to the via hole (311) is formed on one 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 in which the main body (36) approaches the active material coating portion (21).

19. The battery cell (10) according to claim 18, wherein: The support (3) is provided with at least one first liquid injection guide groove (392), the first liquid injection guide groove (392) being located on a side of the support (3) facing the active material coating portion (21), and at least one first liquid injection guide groove (392) being connected to the guide groove (312).

20. The battery cell (10) according to any one of claims 1 to 19, wherein: The support (3) has a first liquid injection guide groove (392), the first liquid injection guide groove (392) is located on the side of the support (3) facing the active substance 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 substance coating portion (21).

21. The battery cell (10) according to any one of claims 1 to 20, wherein: The side of the support (3) facing the battery cell assembly (2) has a clearance portion (391) for avoiding the outer edge of the battery cell assembly (2) facing the side of the support (3).

22. The battery cell (10) according to any one of claims 1 to 21, wherein: The battery cell assembly (2) further comprises a conductive portion (22), wherein the conductive portion (22) is connected to a side of the active material coating portion (21) close to the main body portion (36); A pole (12) is provided on the housing (11), a receiving portion (121) is provided on the pole (12), and at least a portion of the conductive portion (22) is received in the receiving portion (121) and connected to the pole (12).

23. The battery cell (10) according to claim 22, wherein: The accommodating portion (121) has a first accommodating groove (12110); the surface of the pole (12) facing the active material coating portion (21) is the pole inner end face (122); a notch of the first accommodating groove (12110) is formed on the pole inner end face (122); and at least a portion of the conductive portion (22) is accommodated in the first accommodating groove (12110).

24. The battery cell (10) according to claim 22, wherein: The accommodating portion (121) has a second accommodating groove (12120); the surface of the pole (12) away from the active material coating portion (21) is the pole outer end face (123); the notch of the second accommodating groove (12120) is formed on the pole outer end face (123); the second accommodating groove (12120) is connected to the interior of the shell (11) through a through hole (12130); the conductive portion (22) is passed through the through hole (12130) and is at least partially accommodated in the second accommodating groove (12120).

25. The battery cell (10) according to any one of claims 1 to 24, wherein: The number of the openings (1110) is two, and each of the openings (1110) is provided with a shell cover (112). The bracket (3) is arranged at an end of the active material coating portion (21) away from any one of the openings (1110).

26. The battery cell (10) according to any one of claims 1 to 25, wherein: At least one pole (12) is arranged on a shell wall of the shell (11) on one side adjacent to the bracket (3).

27. A battery (100), wherein: The invention comprises a battery cell (10) according to any one of claims 1 to 26.

28. An electrical device (1000), wherein: Comprising a battery (100) according to claim 27.

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