Battery cell, battery, and electric device

Abstract

The application discloses a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell, a shell cover and a shell body; an electric core assembly comprising an active material coating part; a support arranged at one end of the active material coating part away from an opening of the shell body and matched with the electric core assembly; the support has a main body part and an extension part arranged at the side of the main body part, the projection of the main body part on the shell cover plane is located in the projection of the active material coating part on the shell cover plane, and the projection of the extension part on the shell cover plane is located outside the projection of the active material coating part on the shell cover plane. In the technical scheme of the embodiment of the application, the probability of the active material coating part touching the shell can be reduced, and the phenomenon of the shell scratching the active material coating part can be reduced.

Description

Technical Field

[0001] This application relates to the field of batteries, specifically to a battery cell, a battery, and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development. Among related technologies, improving the reliability of individual battery cells is a pressing issue that needs to be addressed. Summary of the Invention

[0003] In view of the above problems, this application provides a battery cell, a battery, and an electrical device, wherein the support of the battery cell can improve the reliability of the battery cell in use.

[0004] In a first aspect, this application provides a battery cell, comprising: a housing, including a housing cover and a housing body having an opening, the housing cover closing onto the opening; a cell assembly, including an active material coating portion disposed within the housing; and a support, disposed at the end of the active material coating portion away from the opening, and cooperating with the cell assembly; wherein the support has a main body portion and an extension portion disposed around the main body portion, the projection of the main body portion on the housing cover plane being located within the projection of the active material coating portion on the housing cover plane, and the projection of the extension portion on the housing cover plane being located outside the projection of the active material coating portion on the housing cover plane.

[0005] In the technical solution of this application embodiment, the support is disposed 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 disposed within the projection of the active material coating part on the shell cover plane. They are then inserted into the shell together. During the process of installing the cell assembly with the support into the shell, the support will preferentially contact the shell body, preventing the end of the shell body near the opening from directly contacting the active material coating part, thus minimizing the occurrence of the shell scratching the active material coating part. The projection of the extension part on the shell cover plane is disposed outside the projection of the active material coating part on the shell cover plane, which can protect the active material coating part during the insertion process, reducing the probability of the active material coating part touching the shell, further reducing the occurrence of the shell scratching the active material coating part. Furthermore, by setting the support to reduce the occurrence of the shell scratching the active material coating part, the possibility of active material detachment is reduced, which to some extent prevents internal short circuits caused by the detached active material overlapping with the opposite polarity electrode, and to some extent prevents the detached active material from chemically reacting with the shell, thereby preventing corrosion and penetration of the shell, thus improving the reliability of the battery cell.

[0006] In some embodiments, the extension is located on opposite sides of the main body along a preset direction, which is parallel to the shell plane. This can prevent the opposite side edges of the active substance coating from touching the shell and avoid the shell scratching the opposite side edges of the active substance coating.

[0007] In some embodiments, the extension is an annular structure surrounding the main body. The support can protect the outer edge of one end of the active material coating, preventing the active material coating from touching the outer edge of the side facing the support, thus avoiding the shell scratching the active material coating and further improving the reliability of the battery cell.

[0008] In some embodiments, the edge of the extension facing away from the housing has a guide surface, which includes an arc surface and / or a slope. The guide surface can serve as a guide, allowing the bracket to be smoothly installed into the housing, thus improving assembly efficiency.

[0009] In some embodiments, the bracket is snapped or bonded to the cell assembly, connecting the bracket and the cell assembly together. This prevents the bracket from falling off before being installed in the casing, thereby improving the product yield of the battery cell. The bracket and the cell assembly can be installed in the casing together, which can protect the cell assembly, ensuring that the cell assembly can be installed smoothly and safely, and also provides insulation.

[0010] In some embodiments, a limiting protrusion is provided on the side of the extension near the casing, and the bracket is engaged with the active material coating part through the limiting protrusion. This configuration allows the limiting protrusion to constrain one end of the active material coating part, reducing the probability of the outer layer of the active material coating part becoming fluffy. It also protects one end of the active material coating part, reducing the problem of the active material coating part touching the casing, thereby reducing the occurrence of the casing scratching the active material coating part. The engagement of the bracket with the active material coating part through the limiting protrusion also prevents the bracket from falling off before being inserted into the casing, thereby improving the product yield of the battery cell.

[0011] In some embodiments, the side surface of the limiting protrusion facing the active material coating portion includes: a first surface that abuts against 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 of the bracket towards the opening. The first and second surfaces can constrain the cell assembly to reduce the probability of the outer layer of the cell assembly becoming fluffy, and also protect the sidewall of the cell assembly, reducing the problem of one end of the cell assembly touching the housing; the second surface can act as a guide, facilitating assembly and improving the assembly efficiency of the cell assembly and the bracket.

[0012] In some embodiments, the battery cell further includes: an insulating member that wraps around the active material coating portion and is connected to the extension portion. The insulating member is located between the active material coating portion and the casing, and can serve as insulation, thereby protecting the cell assembly and preventing the cell assembly from overlapping with the battery cell casing, effectively reducing corrosion of the cell assembly due to exposure; the insulating member is connected to the extension portion to facilitate fixing the insulating member.

[0013] In some embodiments, the connection between the insulating element and the peripheral wall surface of the extension can improve the connection reliability between the insulating element and the peripheral wall of the support and reduce the risk of the insulating element falling off.

[0014] In some embodiments, the peripheral wall surface has a first stepped surface and a second stepped surface. The second stepped surface is located on the side of the first stepped surface closer to the shell cover and is closer to the active material coating portion than the first stepped surface. The insulating component is connected to the second stepped surface. In the above technical solution, setting the peripheral wall surface to include a first stepped surface and a second stepped surface provides installation space for the insulating component. Connecting the insulating component to the second stepped surface reduces the risk of the connection structure between the insulating component and the second stepped surface detaching due to scratching the shell, further improving the connection reliability between the insulating component and the support.

[0015] In some embodiments, the first stepped surface is further away from the active material coating than the outer surface of the insulating member. The first stepped surface can protect the edges of the insulating member and the active material coating, reducing the occurrence of the edges of the insulating member and the active material coating scraping against the inner wall of the housing. It can also protect the connection position between the insulating member and the second stepped surface, reducing the risk of the connection structure between the insulating member and the second stepped surface falling off due to scraping against the housing, and further improving the connection reliability between the insulating member and the support.

[0016] In some embodiments, the battery cell further includes an insulating member that encapsulates the active material coating and is connected to the surface of the main body away from the casing. On one hand, during the process of inserting the battery cell assembly with the support into the casing, the casing will not scratch the edge of the insulating member or the connection point between the insulating member and the main body. Furthermore, the connection point is less likely to be pulled apart during insertion, reducing the movement and slippage of the insulating member during battery cell assembly insertion. This improves the reliability of the connection between the insulating member and the support, reduces the risk of the insulating member detaching, and consequently reduces the risk of casing corrosion due to battery cell assembly exposure, the risk of battery cell assembly failure, and the risk of leakage, thereby improving the reliability and stability of the battery cell. On the other hand, connecting at least a portion of the insulating member to the wall surface of the main body away from the battery cell assembly allows for a longer insulating member design, accommodating battery cell assemblies of different sizes, providing greater compatibility, and improving manufacturability. On the other hand, after the bracket and cell assembly are installed in place inside the housing, the insulation component is pressed between the wall surface opposite the opening and the main body of the housing, which can further reduce the risk of insulation component falling off, reduce the risk of cell assembly failure due to exposure, reduce the risk of housing corrosion, and improve the reliability and stability of the battery cell.

[0017] In some embodiments, the housing is provided with terminals; the cell assembly also includes a conductive part connected to the side of the active material coating part near the main body, and the main body has a through hole through which the conductive part passes to connect with the terminals. In the above technical solution, on the one hand, by providing a through hole on the main body, the bracket can serve to gather and accommodate the conductive part, facilitating the connection between the conductive part and the terminals, and improving the assembly reliability and convenience of the battery cell; on the other hand, by gathering the conductive part with the bracket, the structure of the plastic parts in the original battery cell can be eliminated, and insulation between the entire active material coating part and the housing can be achieved through the cooperation of the bracket and the insulating parts, which can effectively reduce manufacturing and production costs.

[0018] In some embodiments, the bracket is a one-piece structure; or, the bracket is a split structure comprising a separately formed first bracket and a second bracket, with a through hole defined between the first bracket and the second bracket. The one-piece bracket structure is easier to manufacture, has better reliability, and facilitates assembly with the housing assembly, improving assembly efficiency and fit stability. By defining the through hole through the cooperation of the first and second brackets, when assembling the bracket with the cell assembly, it is not necessary to pass the conductive part through one end of the through hole to the other. Instead, the first and second brackets can be joined and clamped at the position of the conductive part, so that the through hole surrounds the conductive part, facilitating the assembly of the bracket with the cell assembly and improving assembly efficiency.

[0019] In some embodiments, a receiving groove communicating with a through hole is provided on the side of the main body opposite to the active material coating portion. The receiving groove is used to accommodate at least a portion of the electrode posts. In the above technical solution, on the one hand, by accommodating at least a portion of the electrode posts through the receiving groove, the structure of the entire battery cell becomes more compact and reliable, which is conducive to improving the energy density of the entire battery; on the other hand, by setting up the receiving groove, the electrode posts can also be partially insulated from the casing through the support, thereby further improving the stability and reliability of the battery cell.

[0020] In some embodiments, a positioning portion is provided on the side of the main body opposite to the active material coating portion. The positioning portion surrounds the circumference of the through hole and extends towards the electrode post. The positioning portion can bind, gather, and support the conductive portion, facilitating the connection between the conductive portion and the electrode post, and improving the assembly efficiency and quality of the battery cell.

[0021] In some embodiments, the terminal post is provided with a receiving portion, at least a portion of the conductive part is received within the receiving portion, and at least a portion of the positioning portion extends into the receiving portion and is used to guide the conductive part into the receiving portion. In the above technical solution, on the one hand, by setting the terminal post as a hollow structure and cooperating the positioning portion with the hollow structure, the conductive part can be guided to connect with the terminal post, which can improve the connection reliability and ensure assembly efficiency and quality; on the other hand, the conductive part can be received within the receiving portion, which improves the assembly efficiency of the conductive part and saves the space occupied by the conductive part, making full use of the space of the battery cell, so that the fit between the bracket and the terminal post, and between the bracket and the conductive part is tighter and more reliable, making the structure of the battery cell more compact and more conducive to improving the energy density of the battery cell.

[0022] In some embodiments, a guide groove communicating with a through hole is formed on the side of the main body facing the active material coating. The guide groove accommodates at least a portion of the conductive part, and the cross-sectional area of ​​the guide groove gradually increases along the direction of the main body near the active material coating. The guide groove can both accommodate the conductive part and avoid damaging it, and can also reduce the probability of the conductive part becoming fluffy or folded, thus reducing redundancy.

[0023] In some embodiments, the support has at least one first liquid injection channel located on the side of the support facing the active material coating portion, and the at least one first liquid injection channel communicates with a guide channel. During liquid injection, the electrolyte can flow along the first liquid injection channel toward the guide channel, allowing the electrolyte to flow to a predetermined position, increasing the contact area between the electrolyte and the active material coating portion. The provision of the first liquid injection channel increases the contact area between the electrolyte and the active material coating portion, which can reduce the problem of poor wetting of the active material coating portion.

[0024] In some embodiments, the support has a first liquid injection channel located on the side of the support facing the active material coating portion; and / or, the support has a second liquid injection channel located on the side of the support opposite to the active material coating portion. During liquid injection, the electrolyte can flow along the first liquid injection channel and / or the second liquid injection channel, providing a wetting path for the electrolyte and increasing its fluidity, thereby improving the injection speed and reducing the formation settling time.

[0025] In some embodiments, the bracket has a clearance portion on the side facing the battery cell assembly to allow the outer edge of the battery cell assembly on that side to pass. By providing the clearance portion, the rounded corner structure between the limiting protrusion and the main body portion can be eliminated, preventing the rounded corner structure from damaging the outer edge of the battery cell assembly.

[0026] In some embodiments, the cell assembly further includes a conductive portion connected to the side of the active material coating portion near the main body; the housing is provided with an electrode post, and the electrode post is provided with a receiving portion, at least a portion of the conductive portion is received within the receiving portion and connected to the electrode post. 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 more battery cells to be accommodated in the same volume of battery, and also 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 the space within the electrode post, the redundancy of the conductive portion within the housing can be reduced to 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 operational reliability and stability of the battery cell and the battery.

[0027] In some embodiments, the receiving portion has a first receiving groove, the surface of the electrode post facing the active material coating portion is the inner end face of the electrode post, the opening of the first receiving groove is formed on the inner end face of the electrode post, and at least a portion of the conductive portion is received within the first receiving groove. In the above technical solution, on the one hand, forming a first receiving groove on the electrode post can reduce the weight of the electrode post to a certain extent, thereby increasing the gravimetric energy density of the battery cell and the battery; on the other hand, since the opening of the first receiving groove is formed on the inner end face of the electrode post, and the inner end face of the electrode post is the surface of the electrode post near the active material coating portion, the first receiving groove can open towards the active material coating portion, thereby facilitating the insertion of the conductive portion into the first receiving groove and improving assembly efficiency. Moreover, this type of first receiving groove is easy to process, improving production efficiency.

[0028] In some embodiments, the receiving portion has a second receiving groove, the surface of the electrode post away from the active material coating portion is the outer end face of the electrode post, the opening of the second receiving groove is formed on the outer end face of the electrode post, the second receiving groove communicates with the interior of the housing through a perforation, and the conductive portion passes through the perforation and is at least partially received in the second receiving groove. In the above technical solution, on the one hand, the electrode post is provided with a second receiving groove, which can reduce the weight of the electrode post to a certain extent, thereby improving the weight energy density of the battery cell and the battery; on the other hand, since the opening of the second receiving groove is formed on the outer end face of the electrode post, and the outer end face of the electrode post is the surface of the electrode post away from the active material coating portion, the second receiving groove can be opened in the direction away from the active material coating portion. In this way, when at least a portion of the conductive portion is received in the second receiving groove, the conductive portion can be easily stored and organized through the opening of the second receiving groove, and the electrical connection operation between the conductive portion and the electrode post can be easily performed through the opening of the second receiving groove, thereby reducing the production difficulty of the battery cell and improving the production efficiency of the battery cell.

[0029] In some embodiments, there are two openings, each with a cover, and a support is located at the end of the active material coating portion away from either opening. In the above technical solution, two openings are provided on the casing, and a support is provided at the end of the cell assembly away from either opening. The cell assembly, with two supports and an insulating component, can be installed into the casing from either opening. A suitable insertion direction can be selected as needed. After the cell assembly is installed in place within the casing, a portion of the insulating component can be pressed between the wall of the casing opposite one of the openings and the corresponding support, while the other portion can be pressed between the wall of the casing opposite the other opening and the corresponding support. This further reduces the risk of the insulating component detaching, reduces the risk of cell assembly failure due to exposure, and also reduces the risk of casing corrosion, thereby improving the reliability and stability of the battery cell.

[0030] In some embodiments, at least one terminal post is provided on the shell wall on the side of the shell adjacent to the support. The cell assembly with the support and insulation enters the shell through the opening, and the conductive part is directly opposite the terminal post, which makes it easier to connect the conductive part to the terminal post and improves the assembly efficiency of the battery cell.

[0031] Secondly, this application provides a battery that includes the battery cell described in the above embodiments.

[0032] In the above technical solution, since the battery is equipped with the aforementioned battery cells, the bracket can not only constrain the active material coating part, but also the extension part can protect the active material coating part, reducing the probability of the active material coating part touching the shell, minimizing the occurrence of the shell scratching the active material coating part, improving the reliability of the battery, and the installation steps are simple and conducive to improving production efficiency.

[0033] Thirdly, this application provides an electrical device that includes the battery described in the above embodiments. In the above technical solution, because the electrical device incorporates the battery, the operational reliability and stability of the battery can be improved, thereby enhancing the operational reliability and stability of the electrical device.

[0034] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0037] Figure 2 Exploded views of the battery structure provided in some embodiments of this application;

[0038] Figure 3 Batteries provided for some embodiments of this application;

[0039] Figure 4 This is an exploded view of the structure of a battery cell according to some embodiments of this application;

[0040] Figure 5 These are cross-sectional views of the battery cells in some embodiments of this application;

[0041] Figure 6 for Figure 5 The enlarged view of the battery cell at point A is shown.

[0042] Figure 7 This is a front view of a battery cell according to some embodiments of this application;

[0043] Figure 8 This is a front view of a battery cell according to other embodiments of this application;

[0044] Figure 9 This is a partial structural cross-sectional view of a battery cell according to some embodiments of this application;

[0045] Figure 10 This is a partial structural cross-sectional view of a battery cell according to other embodiments of this application;

[0046] Figure 11 This is a partial structural cross-sectional view of a battery cell according to some embodiments of this application;

[0047] Figure 12 This is a partial structural cross-sectional view of a battery cell according to some embodiments of this application;

[0048] Figure 13 This is a cross-sectional view of the battery cell assembly, bracket, and insulation components of a battery cell according to some embodiments of this application after assembly.

[0049] Figure 14 for Figure 13 The enlarged view of the battery cell at point B is shown;

[0050] Figure 15 This is a cross-sectional view of the battery cell assembly, bracket, and insulation components assembled in some other embodiments of this application.

[0051] Figure 16 This is a schematic diagram of the structure of the support for a battery cell according to some embodiments of this application;

[0052] Figure 17 This is a schematic diagram of the structure of the support for a battery cell in some other embodiments of this application;

[0053] Figure 18 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0054] Figure 19 This is a cross-sectional view of the support structure of a battery cell according to some embodiments of this application;

[0055] Figure 20 This is a top view of the support for a battery cell according to some embodiments of this application;

[0056] Figure 21 This is a top view of the support for a battery cell according to other embodiments of this application;

[0057] Figure 22 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0058] Figure 23 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0059] Figure 24 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0060] Figure 25 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0061] Figure 26 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0062] Figure 27 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0063] Figure 28 for Figure 27 The exploded view of the battery cell structure is shown below;

[0064] Figure 29 for Figure 28 The exploded view of the first cover plate shown;

[0065] Figure 30 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application;

[0066] Figure 31 for Figure 30 The exploded view of the battery cell structure is shown below;

[0067] Figure 32 This is an assembly diagram of a battery cell according to some embodiments of this application;

[0068] Figure 33 This is an assembly diagram of a battery cell for some other embodiments of this application.

[0069] Icon labels:

[0070] Electrical device 1000, battery 100, controller 200, motor 300

[0071] First direction Z, second direction X, third direction Y, pole axis R.

[0072] 10 battery cells, 20 casings, first casing 201, second casing 202.

[0073] Casing 11, shell body 111, opening 1110, mounting wall 1112, shell cover 112, first shell cover 1121, second shell cover 1122, mounting hole 113.

[0074] The components include: pole post 12, receiving portion 121, first receiving groove 12110, first end wall 12111, first recessed groove 12112, first side wall 12113, second receiving groove 12120, second end wall 12121, second recessed groove 12122, second side wall 12123, first groove segment 12124, second groove segment 12125, guide slope 12126, third stepped surface 12127, through hole 12130, inner end face 122 of pole post, outer end face 123 of pole post, first groove 126, and spacer portion 127.

[0075] First cover plate 13; first conductive element 131; second groove 1311; second conductive element 132; stress relief groove 133;

[0076] Second cover plate 14;

[0077] Battery cell assembly 2, first end 201, second end 202, active material coating part 21, conductive part 22.

[0078] Support 3, through hole 311, guide groove 312, positioning part 32, first support 33, second support 34, guide surface 35, main body part 36, extension part 37, peripheral wall surface 370, first stepped surface 371, second stepped surface 372, limiting protrusion 38, first surface 381, second surface 382, ​​clearance part 391, first liquid injection guide groove 392, receiving groove 393.

[0079] Insulating component 4, connection mark 401,

[0080] 7. Slot cover. Detailed Implementation

[0081] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0082] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0083] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0084] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0085] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0086] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0087] In this application, "multiple" means two or more (including two).

[0088] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0089] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these. Battery cells are generally divided into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.

[0090] The battery mentioned in the embodiments of this application refers to a single physical module comprising 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 housing and one or more battery cells disposed within the housing, or a battery pack includes a housing and one or more battery modules disposed within the housing, the housing preventing liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0091] For example, a battery cell typically includes a housing, an electrode assembly, and an electrolyte. The housing is used to contain the electrode assembly and the electrolyte, and the housing has 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.

[0092] The positive electrode typically includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector. The uncoated positive current collector protrudes from the coated current collector and serves as a positive electrode tab. Multiple positive electrode tabs are stacked together and electrically connected to the positive electrode post. Similarly, the negative electrode typically includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector. The uncoated negative current collector protrudes from the coated current collector and serves as a negative electrode tab. Multiple negative electrode tabs are stacked together and electrically connected to the negative electrode post. The material of the separator is not limited; for example, it can be polypropylene or polyethylene.

[0093] Meanwhile, individual battery cells primarily function by the movement of metal ions between the positive and negative electrode plates. Taking lithium-ion batteries as an example, the positive electrode current collector can be made of aluminum, and 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 charging and discharging, Li+ ions repeatedly insert and extract between the two electrodes: during charging, Li+ ions extract from the positive electrode, pass through the electrolyte, and insert into the negative electrode, leaving the negative electrode in a lithium-rich state; the reverse occurs during discharging.

[0094] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0095] In the battery cell of the relevant technology, during manufacturing, an active material layer is coated onto the current collector and then cut to obtain an electrode sheet consisting of a current collector coated with the active material layer (denoted as the active material coated part) and a current collector without the active material layer coated with the active material layer (denoted as the tab). Then, the positive and negative electrode sheets and the separator are sequentially stacked or wound to obtain an electrode assembly. Multiple tabs are stacked in the electrode assembly to form a tab portion, which itself forms a conductive part, or the tab portion is connected to an adapter plate to form a conductive part. The active material coated part and the conductive part form the cell assembly. The battery cell casing has terminals. During battery cell assembly, the conductive part of the cell assembly is usually welded to the terminals on the casing, and then they are inserted into the casing together through the opening in the casing.

[0096] However, the inventors discovered that during the process of inserting the battery cell assembly into the casing through the opening, the insulating components and the battery cell assembly (especially the edges of the battery cell assembly) are prone to interfering with or scratching the casing, causing damage to the insulating components and the electrode plates of the battery cell assembly, which in turn causes the active material to fall off. This may result in the active material overlapping with the electrode plate of opposite polarity, leading to an internal short circuit. Furthermore, the insulating components are prone to wrinkling during the friction with the casing, causing the battery cell assembly to come into contact with the inner wall surface of the casing, resulting in corrosion of the battery cell assembly and affecting the reliability of the battery cell.

[0097] To reduce the occurrence of the battery cell assembly being scratched by the casing, this application places a support at the end of the active material coating area away from the opening. The projection of the main body on the casing plane is within the projection of the active material coating area on the casing plane, and then they are inserted into the casing together. During the process of installing the battery cell assembly with the support into the casing, the support will preferentially contact the casing body, which to some extent prevents the end of the casing body near the opening from directly contacting the active material coating area, thus minimizing the occurrence of the casing scratching the active material coating area. Placing the projection of the extension on the casing plane outside the projection of the active material coating area on the casing plane can protect the active material coating area during the casing insertion process, reducing the probability of the active material coating area touching the casing, further reducing the occurrence of the casing scratching the active material coating area. By setting the support to reduce the occurrence of the casing scratching the active material coating area, the possibility of active material falling off is reduced, which to some extent prevents the internal short circuit caused by the falling active material overlapping with the opposite polarity electrode, and also to some extent prevents the falling active material from chemically reacting with the casing, thereby preventing the casing from being corroded and penetrated, thus improving the reliability of the battery cell.

[0098] The battery cells disclosed in this application can be used in electrical devices that use batteries as a power source or in various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0099] Taking a vehicle as an example of an electrical device according to one embodiment of this application, the structure of the battery cell, battery, and electrical device provided in the embodiment of this application will be described in detail.

[0100] Please refer to Figure 1 , Figure 1 The electrical device 1000 provided in some embodiments of this application is a structural schematic diagram of a vehicle. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle is equipped with a battery 100, which can be located at the bottom, front, or rear of the vehicle. The battery 100 can be used to power the vehicle; for example, the battery 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of starting, navigation, and driving the vehicle. In some embodiments of this application, the battery 100 can not only serve as the vehicle's operating power source but also as the vehicle's driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0101] Please refer to Figure 2 , Figure 2 This is an exploded view of the structure of a battery 100 provided in some embodiments of this 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 provides a receiving space for the battery cells 10, and the housing 20 can adopt various structures. In some embodiments, the housing 20 may include a first housing 201 and a second housing 202, which overlap each other, and together define a receiving space for accommodating the battery cells 10. The second housing 202 may be a hollow structure open at one end, and the first housing 201 may be a plate-like structure, with the first housing 201 covering the open side of the second housing 202, so that the first housing 201 and the second housing 202 together define an assembly space; alternatively, the first housing 201 and the second housing 202 may both be hollow structures open on one side (e.g., Figure 2As shown, the opening side of the first box 201 is closed to the opening side of the second box 202. Of course, the box 20 formed by the first box 201 and the second box 202 can be of various shapes, such as a cylinder or a cuboid.

[0102] In battery 100, multiple battery cells 10 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 10 are connected in both series and parallel configurations. Multiple battery cells 10 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 10 is housed within housing 20. Alternatively, battery 100 can also be composed of multiple battery cells 10 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within housing 20. Battery 100 may also include other structures; for example, battery 100 may also include a busbar component for realizing electrical connections between multiple battery cells 10.

[0103] Please refer to Figure 3 , Figure 3 The diagram below illustrates a battery cell 10 according to some embodiments of this application. In these embodiments, the battery cell 10 is cuboid, with its height direction being a first direction Z, its length direction being a second direction X, and its thickness direction being a third direction Y. The first direction Z, the second direction X, and the third direction Y are all perpendicular to each other. Of course, in other embodiments of this application, the battery cell 10 may also be cylindrical, flat, or other shapes, and this embodiment is not limited thereto.

[0104] Please refer to Figure 4 and Figure 5 , Figure 4 This is an exploded view of the structure of a battery cell according to some embodiments of this application. Figure 5 This is a cross-sectional view of the structure of a battery cell according to some embodiments of this application. In the embodiments of this application, the battery cell 10 includes a housing 11, a cell assembly 2, a support 3, and an insulating member 4.

[0105] The shape of the casing 11 varies depending on the type of battery cell 10. The type of battery cell 10 in this embodiment is not limited. For example, when the battery cell 10 is a prismatic battery, the casing 11 is prismatic; when the battery cell 10 is a cylindrical battery, the casing 11 is cylindrical. This embodiment uses a prismatic casing 11 as an example for illustration. The casing 11 is provided with terminals 12, which are used to electrically connect to the cell assembly 2 to ensure the normal charging and discharging operation of the battery cell 10. Generally, there are at least two terminals, specifically at least one positive terminal and at least one negative terminal. For example, when there are two terminals, one is a positive terminal and one is a negative terminal, both electrically connected to the positive and negative output positions of the cell assembly 2, respectively. Alternatively, when there are four terminals, two can be positive terminals and two can be negative terminals. In this case, both positive terminals are electrically connected to the positive output position of the cell assembly 2, and both negative terminals are electrically connected to the negative output position of the cell assembly 2. The housing 11 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold. The pressure relief mechanism can release pressure when the internal pressure or temperature of the battery cell 10 is too high, so as to prevent thermal runaway from being transmitted to other battery cells 10.

[0106] Furthermore, in the embodiments of this application, the housing 11 specifically includes a housing body 111 and a housing cover 112.

[0107] The casing 111 is a semi-closed structure with an opening 1110 at one end, or an annular structure with openings 1110 at both ends. The casing 111 can also be of various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. The shape of the casing 111 can be determined according to the specific shape and size of the battery cell assembly 2. The casing 111 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic; this embodiment does not impose any special limitations on this. The casing 111 has one or more openings 1110.

[0108] The cover 112 is a component that closes onto the opening 1110 of the housing 111 to isolate the internal environment of the battery cell 10 from the external environment. The number of cover 112s corresponds to the number of openings 1110. When there is one opening 1110, there is also one cover 112, which is placed over the opening 1110 to close it. When there are two openings 1110, there are two cover 112s, each placed over one of the two openings 1110 to close the corresponding opening. The cover 112 and the housing 111 can form a common connecting surface before other components are inserted into the housing. When it is necessary to enclose the interior of the housing 111, the cover 112 is then placed over the housing 111. Furthermore, the shape of the cover 112 can be adapted to the shape of the housing 111 to fit the housing 111. Optionally, the cover 112 can be made of a material with a certain degree of hardness and strength (such as aluminum alloy). This makes the cover 112 less prone to deformation under pressure and impact, allowing the battery cell 10 to have higher structural strength and improved safety performance. Functional components such as terminal posts 12 can be provided on the cover 112. The material of the cover 112 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0109] The housing 11 is provided with multiple pole posts 12. These pole posts 12 can be all disposed on the housing body 111, all disposed on the housing cover 112, or partially disposed on the housing body 111 and partially disposed on the housing cover 112. The following embodiments of this application use a square housing body 111, one opening 1110, and two pole posts 12, designated as a positive and a negative pole post, both disposed on the wall of the housing body 111 opposite the opening 1110. Of course, in other embodiments of this application, the shape of the housing body 111, the number of openings 1110 and housing cover 112, the number of pole posts 12, and the position of the pole posts 12 can all be adjusted according to requirements, and the embodiments of this application do not limit this.

[0110] In the embodiments of this 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 disposed within the housing 11 and is the part of the battery cell assembly 2 coated with active material, which can assist in the intercalation and deintercalation of metal ions during the charging and discharging process of the battery cell 10. The conductive portion 22 is a metal structure that electrically connects the active material coating portion 21 and the terminal post 12. It is not coated with active material, and the terminal post 12 can be electrically connected to the active material coating portion 21 through the conductive portion 22, so that the charging and discharging operation of the battery cell 10 can be performed. The conductive portion 22 can be formed by the tab itself or by connecting the tab and the adapter piece.

[0111] The active material coating section 21 is divided into a positive electrode active material coating section and a negative electrode active material coating section. The positive electrode active material coating section includes the portion of the positive electrode current collector coated with a positive electrode active material layer, and the negative electrode active material coating section includes the portion of the negative electrode current collector coated with a negative electrode active material layer. The conductive section 22 is divided into a positive electrode conductive section and a negative electrode conductive section. The positive electrode conductive section is electrically connected to the positive electrode active material coating section and the positive electrode post, and the negative electrode conductive section is electrically connected to the negative electrode active material coating section and the negative electrode post.

[0112] In the embodiments of this application, please refer again to Figure 4 and Figure 5 The support 3 is disposed at the end of the active material coating portion 21 away from the opening 1110, and the support 3 cooperates with the battery cell assembly 2. In an embodiment where the opening 1110 of the housing 111 is a single opening, during the process of installing the battery cell assembly 2 with the support 3 into the housing 11, the support 3 first enters the housing 111 from the opening 1110, and then the active material coating portion 21 enters the housing 111. After the battery cell assembly 2 is installed in place in the housing 111, the support 3 is located on the wall of the housing 111 opposite to its opening 1110 and at the end of the active material coating portion 21 away from the opening 1110. In an embodiment where there are two openings 1110 in the housing 111, the two openings 1110 can be a first opening and a second opening arranged opposite to each other. During the process of installing the battery cell assembly 2 with the support 3 into the housing 11, the support 3 first enters the housing 111 from the first opening and moves toward the second opening. Then the active material coating part 21 enters the housing 111. After the battery cell assembly 2 is installed in place in the housing 111, the support 3 is located at the second opening.

[0113] The insulating component 4 encloses the active material coating part 21. The insulating component 4 can improve the insulation reliability between the active material coating part 21 and the housing 11, reduce or prevent the active material coating part 21 from contacting the housing 11 and causing the housing 11 to be corroded, reduce the leakage of electrolyte caused by the corrosion of the housing 11, and improve the reliability of the battery cell 10.

[0114] Please refer to this again. Figure 4 and Figure 5 The support 3 has a main body 36 and an extension 37. The extension 37 is disposed around the main body 36. The projection of the main body 36 onto the plane of the cover 112 is within the projection of the active material coating 21 onto the plane of the cover 112, while the projection of the extension 37 onto the plane of the cover 112 is outside the projection of the active material coating 21 onto the plane of the cover 112. That is, along the direction perpendicular to the cover 112, the projection of the support 3 onto the plane of the cover 112 at least partially exceeds the projection of the active material coating 21 onto the plane of the cover 112.

[0115] The support 3 can be a plate-shaped structure. The support 3 can be set on the side of the active material coating part 21 with the conductive part 22. The support 3 can be provided with a clearance structure (such as clearance groove or through hole 311 as described below) to avoid the conductive part 22. The support 3 can also be set on the side of the active material coating part 21 without the conductive part 22, so that the support 3 does not need to be provided with a clearance structure to avoid the conductive part 22.

[0116] When the support 3 is disposed on the side of the active material coating portion 21 with the conductive portion 22, the support 3 can be disposed opposite to the electrode post 12, that is, the support 3 and the electrode post 12 are located on the same side of the active material coating portion 21, and the support 3 can be disposed between the electrode post 12 and the active material coating portion 21. When the support 3 is disposed on the side of the active material coating portion 21 without the conductive portion 22, the support 3 and the electrode post 12 are not disposed opposite to each other. For example, the support 3 and the electrode post 12 are located on adjacent sides of the active material coating portion 21; or, for another example, the support 3 and the electrode post 12 are located on opposite sides of the active material coating portion 21.

[0117] It should be noted that in the embodiments of this application, the bracket 3 in the embodiments of this application may be added to the original structure of the existing battery cell without changing the rest of the structure of the existing battery cell (such as the top cover, upper plastic body, lower plastic body, etc.); or an independent bracket 3 may be used to replace the lower plastic part embedded under the top cover of the existing battery cell.

[0118] In the technical solution of this application embodiment, the bracket 3 is disposed at the end of the active material coating part 21 away from the opening 1110. The projection of the main body part 36 on the plane of the shell cover 112 is disposed within the projection of the active material coating part 21 on the plane of the shell cover 112. Then, they are inserted into the shell together. During the process of inserting the battery cell assembly 2 with the bracket 3 into the shell 11, the bracket 3 will preferentially contact the shell body 111, which to a certain extent prevents the end of the shell body 111 near the opening 1110 from directly contacting the active material coating part 21, and minimizes 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 disposed 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 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 setting the bracket 3, the occurrence of scratches on the active material coating part 21 of the casing 11 is reduced, thereby reducing the possibility of active material falling off. This can prevent the internal short circuit caused by the falling active material overlapping with the electrode sheet of the opposite polarity to a certain extent, and can also prevent the falling active material from reacting chemically with the casing 11 to a certain extent, which could lead to corrosion and penetration of the casing 11, thereby improving the reliability of the battery cell 10.

[0119] In some embodiments, the extensions 37 are located on opposite sides of the main body 36 along a predetermined direction, which is parallel to the plane of the cover 112. For example, refer to... Figure 4 The cross-sectional shape of the battery cell 10 can be rectangular. The height direction of the battery cell 10 is the first direction Z, and the length direction of the battery cell 10 is the second direction X. The cover 112 is provided at one end of the housing 11 in the height direction, and the extension 37 is located on both sides of the main body 36 along the second direction. Of course, the cross-sectional shape of the battery cell 10 is not limited to a rectangle, but can also be circular, etc., which is not limited here.

[0120] In the above technical solution, the extension 37 is provided on both sides of the main body 36 along a preset direction, which can prevent the opposite side edges of the active material coating part 21 from touching the shell 11 and avoid the shell 11 from scratching the opposite side edges of the active material coating part 21.

[0121] In some embodiments, the extension 37 is an annular structure surrounding the main body 36. That is, the projection edge of the support 3 on the plane of the cover 112 extends beyond the projection of the active material coating 21 on the plane of the cover 112. With this configuration, the support 3 can protect the outer edge of one end of the active material coating 21, preventing the outer edge of the active material coating 21 facing the support 3 from touching the housing 11, avoiding the phenomenon of the housing 11 scratching the active material coating 21, and further improving the reliability of the battery cell 10.

[0122] Please refer to this again. Figure 5 and further refer to Figure 6 , Figure 6 for Figure 5 The image shows an enlarged view of the battery cell 10 at point A. The edge of the support 3 facing away from the housing cover 112 has a guide surface 35, that is, the peripheral portion of the side surface of the support 3 facing away from the housing cover 112. Specifically... Figure 6 The edge of the bracket 3 facing away from the cover 112 includes at least the connection position of the extension 37 on the side facing away from the main body 36 and the side facing away from the cover 112.

[0123] For example, the guide surface 35 may include a bevel. Specifically, the edge of the bracket 3 facing away from the cell assembly 2 may be chamfered. Here, "chamfering" refers to machining the edges of the bracket 3 with a certain bevel through cutting or other processes to facilitate the bracket 3's insertion into the housing 11. For example, the guide surface 35 may include a curved surface. The curved surface can also play an automatic guiding role during the insertion of the bracket 3 into the housing 11. For example, the guide surface 35 may include both curved and beveled surfaces. Of course, the guide surface 35 can also be other irregularly shaped surfaces, which are not limited here.

[0124] 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 the assembly efficiency.

[0125] According to some embodiments of this application, the bracket 3 is snapped or bonded to the battery cell assembly 2.

[0126] Specifically, in the embodiment where the bracket 3 and the battery cell assembly 2 are snapped together, a mounting groove can be provided on the bracket 3. The end of the active material coating part 21 away from the opening 1110 fits into the mounting groove, thereby achieving the purpose of snapping the end of the active material coating part 21 away from the opening 1110 with the bracket 3. The connection structure is simple and easy to operate. Of course, the snapping method between the bracket 3 and the battery cell assembly 2 is not limited to the above structure. In the embodiment where the bracket 3 and the battery cell assembly 2 are bonded together, adhesive can be provided between the end of the active material coating part 21 away from the opening 1110 and the bracket 3, or adhesive can be provided between the side wall of the active material coating part 21 and the bracket 3, thereby achieving the purpose of bonding the active material coating part 21 away from the opening 1110 with the bracket 3. Of course, the location of the adhesive is not limited to the above locations.

[0127] It should be noted that the connection method between the bracket 3 and the cell assembly 2 is not limited to the above structure. The specific method can be selected according to the actual situation. Connecting the bracket 3 and the cell assembly 2 together can prevent the bracket 3 from falling off before being installed in the casing, thereby improving the product yield of the battery cell 10. When the bracket 3 and the cell assembly 2 are installed in the casing together, it can protect the cell assembly 2, ensure that the cell assembly 2 can be installed smoothly and safely, and also play an insulating role.

[0128] Please refer to Figure 7 and Figure 8 , Figure 7 This is a front view of a battery cell 10 according to some embodiments of this application. Figure 8 This is a front view of a battery cell 10 according to other embodiments of this application. A limiting protrusion 35 is provided on one side of the bracket 3, and the limiting protrusion 35 is engaged with the active material coating portion 21.

[0129] For example, the limiting protrusion 35 can be provided on the extension 37. The limiting protrusion 35 can be provided on the side of the extension 37 near the cover 112, that is, the limiting protrusion 35 is formed by protruding from the surface of the extension 37 near the cover 112 toward the cover 112. The limiting protrusion 35 can also be provided on the side of the extension 37 away from the main body 36, that is, one end of the limiting protrusion 35 is connected to the side of the extension 37 away from the main body 36, and the other end of the limiting protrusion 35 extends toward the cover 112 and extends beyond the end face of the main body 36 near the cover 112.

[0130] For example, the limiting protrusion 35 may be provided on the main body 36, and the limiting protrusion 35 may be provided on the side of the main body 36 near the cover 112, that is, the limiting protrusion 35 is formed by protruding from the surface of the main body 36 near the cover 112 toward the cover 112.

[0131] For ease of understanding, the active material coating part 21 can be defined as having a first end 201 and a second end 202 disposed opposite to each other. The limiting protrusion 38 stops on the outside of the side wall of the active material coating part 21 near its first end 201. During the process of installing the battery cell assembly 2 with the support 3 into the housing 11, the first end 201 of the active material coating part 21 with the support 3 enters the housing 11 first. 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 housing 11. During the assembly process, the limiting protrusion 38 is located between the side wall of the active material coating part 21 and the housing 11. After the battery cell assembly 2 and the support 3 are installed in place in the housing 11, the support 3 is located between the wall of the housing 11 opposite to its opening 1110 and the first end 201 of the active material coating part 21.

[0132] With this configuration, the limiting protrusion 38 can constrain one end of the active material coating 21, reducing the probability of the outer layer of the active material coating 21 becoming loose. It also protects one end of the active material coating 21, reducing the problem of the active material coating 21 touching the housing 11, thereby reducing the occurrence of the housing 11 scratching the active material coating 21. At the same time, the bracket 3 is engaged with the active material coating 21 through the limiting protrusion 38, which to some extent prevents the bracket 3 from falling off before being inserted into the housing, thereby improving the product yield of the battery cell 10.

[0133] Please refer to this again. Figure 7 The limiting protrusion 38 forms an annular protrusion that extends circumferentially along the cell assembly 2.

[0134] In other words, the limiting protrusion 38 can be an integral 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, more effectively reducing the probability of the outer layer of the battery cell assembly 2 becoming fluffy, and also protecting one end of the battery cell assembly 2, reducing the problem of one end of the battery cell assembly 2 touching the housing 11, thereby reducing the occurrence of the housing 11 scratching the battery cell assembly 2.

[0135] Please refer to this again. Figure 8 The limiting protrusions 38 may include multiple ones, which are arranged at intervals in the circumferential direction of the battery cell assembly 2. There is a gap between two adjacent limiting protrusions 38. With this arrangement, the limiting protrusions 38 can constrain and protect the battery cell assembly 2, reduce materials and lower costs, and facilitate the assembly of the bracket 3 with the battery cell assembly 2.

[0136] Of course, the arrangement of the multiple limiting protrusions 38 is not limited to the above situation, and can be selected according to actual needs. Specifically, the limiting protrusions 38 may be in contact with the sidewall of the battery cell assembly 2; or, there may be a gap between the limiting protrusions 38 and the sidewall of the battery cell assembly 2. That is to say, the limiting protrusions 38 may or may not contact the sidewall of the battery cell assembly 2. The limiting protrusions 38 stop the movement of the sidewall of the battery cell assembly 2, reducing the probability of the outer layer of the battery cell assembly 2 becoming fluffy, and also protecting the sidewall of the battery cell assembly 2, reducing the problem of one end of the battery cell assembly 2 touching the housing 11.

[0137] Please refer to Figure 9 , Figure 9 This is a partial structural cross-sectional view of a battery cell 10 according to some embodiments of this application. The side surface of the limiting protrusion 38 facing the active material coating portion 21 may include a first surface 381. The first surface 381 is in contact with the sidewall of the active material coating portion 21. The first surface 381 can constrain the cell assembly 2 to reduce the probability of the outer layer of the active material coating portion 21 becoming fluffy, and also protects the sidewall of the active material coating portion 21, reducing the problem of one end of the active material coating portion 21 touching the housing 11.

[0138] Please refer to Figure 10 , Figure 10 This is a partial structural cross-sectional view of a battery cell 10 according to other embodiments of this application. The side surface of the 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 support 3 toward the opening 1110. That is, the second surface 382 extends obliquely in a direction away from the root of the limiting protrusion 38 and the sidewall of the active material coating portion 21. For example, the second surface 382 may be a slope or an arc surface.

[0139] With this configuration, the second surface 382 can stop the sidewall of the active material coating portion 21, reducing the probability of the outer layer of the electroactive material coating portion 21 becoming loose, and also protecting the sidewall of the active material coating portion 21. In addition, the second surface 382 can act as a guide, facilitating assembly and improving the assembly efficiency of the cell assembly 2 and the bracket 3. Please refer to... Figure 11 , Figure 11 This is a partial structural cross-sectional view of a battery cell 10 according to some embodiments of this application.

[0140] Please refer to Figure 11 , Figure 11This is a partial structural cross-sectional view of a battery cell 10 according to some embodiments of this application. The side surface of the 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 in contact 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 of the bracket 3 toward the opening 1110. The first surface 381 is located between the root of the limiting protrusion 38 and the second surface 382.

[0141] Specifically, the outline of the first surface 381 can be a straight line extending vertically along the height direction of the bracket 3, and the outline of the second surface 382 can be an oblique line set at an inclination along the height direction of the bracket 3. This arrangement can not only provide a good constraint on the active material coating part 21 and effectively reduce the probability of the outer layer of the active material coating part 21 becoming loose, but also facilitate assembly and improve the assembly efficiency of the cell assembly 2 and the bracket 3.

[0142] Please refer to Figure 12 , Figure 12 This is a partial structural cross-sectional view of a battery cell according to some embodiments of this application. The side of the support 3 facing the cell assembly 2 has a clearance portion 391, which is used to avoid the outer edge of the cell assembly 2 facing the support 3, thereby reducing the risk of the support 3 damaging the cell assembly 2.

[0143] Specifically, in the embodiment where the bracket 3 has a limiting protrusion 38, during the molding of the bracket 3, a rounded corner structure may appear at the root of the limiting protrusion 38 near 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, preventing the rounded corner structure from damaging the outer edge of the battery cell assembly 2. The clearance portion 391 can be a groove opening towards the battery cell assembly 2. For example, the groove can be an annular groove. Alternatively, multiple grooves can be arranged at intervals, and the shape of the groove can be selected according to the actual situation. Another example is that the clearance portion 391 can also be a clearance slope or clearance arc surface that avoids the battery cell assembly 2. In other embodiments of this application, the side of the bracket 3 facing the battery cell assembly 2 can also be in complete contact with the battery cell assembly 2, i.e., there is no clearance structure on the side of the bracket 3 facing the battery cell assembly 2.

[0144] Please refer to Figures 13-15 , Figure 13 This is a cross-sectional view of the structure of the battery cell 10 of some embodiments of this application after the cell assembly 2, the bracket 3, and the insulating member 4 are assembled. Figure 14 for Figure 13 The enlarged view of the battery cell 10 shown at point B. Figure 15This is a cross-sectional view of the battery cell assembly 2, support 3, and insulating member 4 assembled in some other embodiments of this application. The battery cell 10 may also include an insulating member 4, which is wrapped around the active material coating portion 21 and connected to the extension portion 37. The insulating member 4 and the support 3 may be bonded together or heat-fused together; of course, the insulating member 4 and the support 3 may also be connected in other ways.

[0145] With the battery cell assembly 2 with bracket 3 installed in the housing 11, the insulating part 4 is located between the active material coating part 21 and the housing 11, which can play an insulating role and protect the battery cell assembly 2, preventing the battery cell assembly 2 from overlapping with the housing 11 of the battery cell 10, and effectively reducing the corrosion of the battery cell assembly 2 due to exposure; the insulating part 4 is connected to the extension part 37 to fix the insulating part 4.

[0146] Please refer to this again. Figure 13 and Figure 14 The insulating member 4 is connected to the peripheral wall surface 370 of the extension 37. Here, "peripheral wall surface 370 of the extension 37" refers to the outer wall surface of the extension 37 extending along its height direction (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 side walls, each side wall surface being parallel to the height direction (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 be an irregular structure.

[0147] Specifically, in the embodiment where the insulating element 4 and the support 3 are thermally fused together, the insulating element 4 and the peripheral wall surface 370 of the support 3 are thermally fused together to form a connection mark 401. The connection mark 401 can be an annular structure extending along the circumference of the support 3, or it can include multiple connection structures arranged at intervals along the circumference of the support 3.

[0148] More specifically, in the embodiment where the cell assembly 2 is a cuboid, the bracket 3 can be a rectangular plate with a corresponding shape, the insulating member 4 wraps around the four side walls of the cell assembly 2, and the insulating member 4 is thermally fused to the four side walls of the bracket 3. The thermal fusion connection between the insulating member 4 and each side wall of the bracket 3 forms a connection mark 401, thereby improving the connection reliability between the insulating member 4 and the bracket 3.

[0149] In the above technical solution, by connecting the insulating component 4 to the peripheral wall surface 370 of the bracket 3, the connection reliability between the insulating component 4 and the bracket 3 can be improved, and the risk of the insulating component 4 falling off can be reduced.

[0150] Please refer to this again. Figures 9-12The peripheral wall surface 370 has a first stepped surface 371 and a second stepped surface 372. The second stepped surface 372 is located on the side of the first stepped surface 371 that is close to the shell cover 112. The second stepped surface 372 is closer to the active material coating part 21 than the first stepped surface 371. The insulating member 4 is connected to the second stepped surface 372.

[0151] In the above technical solution, the peripheral wall surface 370 is configured to include a first step surface 371 and a second step surface 372, which can provide installation space for the insulating component 4. Connecting the insulating component 4 to the second step surface 372 can reduce the risk of the connection structure between the insulating component 4 and the second step surface 372 falling off due to scratching the housing 11, and further improve the connection reliability between the insulating component 4 and the bracket 3.

[0152] 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. That is, the first stepped surface 371 extends beyond the connection position between the support 3 and the insulating member 4. During the process of installing the cell assembly 2 with the support 3 into the housing 11, the support 3 first enters the housing 111 through the opening 1110, and then the active material coating portion 21 of the insulating member 4 enters the housing 111 through the opening 1110.

[0153] Since the first step surface 371 is farther away from the active material coating part 21 than the outer surface of the insulating member 4, during the insertion process, the first step surface 371 can protect the edges of the insulating member 4 and the active material coating part 21, reducing the occurrence of the edges of the insulating member 4 and the active material coating part 21 scraping against the inner wall of the housing 11. It can also protect the connection position between the insulating member 4 and the second step surface 372, reducing the risk of the connection structure between the insulating member 4 and the second step surface 372 falling off due to scraping against the housing 11, and further improving the connection reliability between the insulating member 4 and the support 3.

[0154] Please refer to this again. Figure 15 The battery cell 10 also includes an insulating member 4, which wraps around the active material coating portion 21 and is connected to the surface of the main body portion 36 away from the cover 112.

[0155] By connecting at least a portion of the insulating member 4 to the wall surface of the main body 36 away from the cell assembly 2, on the one hand, during the process of installing the cell assembly 2 with the support 3 into the housing 11, the housing 11 will not scratch the edge of the insulating member 4, nor will it scratch the connection position between the insulating member 4 and the main body 36, and the connection position between the two is not easily pulled apart during the installation process. This reduces the movement and slippage of the insulating member 4 during the installation of the cell assembly 2, improves the connection reliability between the insulating member 4 and the support 3, reduces the risk of the insulating member 4 falling off, and further reduces the risk of the housing 11 being corroded due to the cell assembly 2 being exposed, reduces the risk of the cell assembly 2 itself failing, and reduces the risk of leakage, thereby improving the reliability and stability of the battery cell 10. On the other hand, by connecting at least a portion of the insulating member 4 to the wall surface of the main body 36 away from the cell assembly 2, the size of the insulating member 4 can be designed to be longer, which can be used for cell assemblies 2 of different sizes, has higher compatibility, and improves manufacturability. On the other hand, after the bracket 3 and the cell assembly 2 are installed in the housing 11, the insulating part 4 is pressed between the wall surface of the housing 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 cell assembly 2 failing due to exposure, reduce the risk of the housing 11 being corroded, and improve the reliability and stability of the battery cell 10.

[0156] According to some optional embodiments of this application, the insulating member 4 and the wall surface of the main body 36 away from the cell assembly 2 are continuously connected in a ring shape in the circumferential direction. Here, the ring connection 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.

[0157] This configuration increases the connection area between the insulating component 4 and the support 3, thereby improving the reliability and stability of the connection between the insulating component 4 and the support 3 in the circumferential direction of the support 3, further reducing the risk of the insulating component 4 falling off, and thus improving the reliability of the battery cell assembly 2 entering the casing, ensuring the reliability and stability of the battery cell 10.

[0158] In the embodiments of this application, the insulating member 4 and the support 3 are connected in a ring-shaped interval around the wall surface away from the cell assembly 2. That is, there are multiple connection points between the insulating member 4 and the support 3, and these multiple connection points are arranged at intervals around the circumference of the support 3. While ensuring the reliability and stability of the connection between the insulating member 4 and the support 3 in the circumferential direction of the support 3, connection materials can be saved, material costs can be reduced, connection steps can be simplified, and production efficiency can be improved.

[0159] Of course, in other embodiments of this application, the insulating member 4 and the support 3 can also be continuously connected in a circumferential ring to the wall surface away from the cell assembly 2. Here, the ring connection means that the connection position of the insulating member 4 and the support 3 extends along the circumference of the support 3 to form a closed ring. This arrangement increases the connection area between the insulating member 4 and the support 3, thereby improving the reliability and stability of the connection between the insulating member 4 and the support 3 in the circumferential direction of the support 3, further reducing the risk of the insulating member 4 falling off, and thus improving the reliability of the cell assembly 2 being installed in the casing, ensuring the reliability and stability of the battery cell 10.

[0160] In other embodiments of this application, the connection positions of the insulating member 4 and the bracket 3 can be concentrated on opposite sides, adjacent sides or multiple sides of the bracket 3. The specific selection can be made according to the actual shape of the cell assembly 2 and the bracket 3, and is not limited here.

[0161] Please refer to this again. Figure 15 In the embodiments of this application, the connection between the insulating component 4 and the bracket 3 can be a heat fusion connection, and the insulating component 4 and the bracket 3 are heat fused to the wall surface away from 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 related technologies, 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 component 4 falling off.

[0162] Specifically, in the embodiments of this application, there are multiple connection marks 401, which are arranged circumferentially around the wall of the bracket 3 away from the cell assembly 2. In other embodiments of this application, the connection marks 401 may also extend circumferentially around the wall of the bracket 3 away from the cell assembly 2, so as to make the connection between the insulating member 4 and the bracket 3 more secure, thereby significantly improving the connection reliability between the insulating member 4 and the bracket 3 and reducing the risk of the insulating member 4 falling off.

[0163] It should be noted that, in the embodiments of this application, the shape of the connection mark 401 can be rectangular, circular, or elliptical, 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 cell assembly 2 and the bracket 3. For example, when the cross-sectional shape of the 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 opposite two edges of the bracket 3. As another example, when the cross-sectional shape of the cell assembly 2 and the bracket 3 is circular, the multiple connection marks 401 can be evenly distributed around the circumference of the bracket 3 away from the wall of the cell assembly 2.

[0164] Of course, the distribution of multiple connection marks 401 is not limited to the above form, and the spacing 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 reliability of the connection between the insulating part 4 and the bracket 3.

[0165] Taking the battery cell assembly 2 as a cuboid as an example, in the embodiments of this application, the bracket 3 can be a rectangular plate with a corresponding shape. The bracket 3 is disposed on one wall of the battery cell assembly 2, and the insulating member 4 covers the remaining five circumferential walls of the battery cell assembly 2 to ensure the insulation effect between the battery cell assembly 2 and the housing 11. At the same time, the connection mark 401 formed by the insulating member 4 and the wall of the bracket 3 away from the battery cell assembly 2 can be disposed near the circumferential edge of the bracket 3, and can be near two, three or four circumferential edges of the bracket 3. The number of connection marks 401 formed by the insulating member 4 and the corresponding edge can be increased or decreased according to the size of the corresponding edge, and the embodiments of this application are not limited.

[0166] In the above technical solution, on the one hand, the use of hot-melt connection can facilitate the cooperation between the insulating component 4 and the bracket 3, improve assembly efficiency, ensure the efficiency of the battery cell assembly 2 entering the casing, and save assembly and manufacturing costs; on the other hand, whether the connection mark 401 extends in a circumferential ring or is arranged in a circumferentially spaced manner, it can improve the firmness of the connection between the insulating component 4 and the bracket 3, improve the reliability and stability of the connection between the insulating component 4 and the bracket 3, and fully reduce the risk of the insulating component 4 falling off; at the same time, compared with the circumferential ring extension, the circumferentially spaced arrangement can also save materials and reduce costs while ensuring the reliability of the connection between the insulating component 4 and the bracket 3.

[0167] Please refer to this again. Figure 13 and further refer to Figure 16 and Figure 17 , Figure 16 This is a schematic diagram of the structure of the support 3 of the battery cell 10 in some embodiments of this application. Figure 17 This is a schematic diagram of the support 3 of the battery cell 10 in some other embodiments of this application. In order to facilitate the connection of the conductive part 22 to the terminal post 12 from the side of the active material coating part 21 near the support 3, in the embodiments of this application, the conductive part 22 is connected to the side of the active material coating part 21 near the main body part 36. The main body part 36 has a through hole 311, through which the conductive part 22 passes to connect to the terminal post 12.

[0168] The shape of the via 311 can be selected according to the shape of the conductive part 22. For example, if the cross-sectional shape of the conductive part 22 extending into the via 311 is elongated, the shape of the via 311 can be a regular shape such as square, rectangle, ellipse, or oblong, or it can be an irregular shape; as another example, if the cross-sectional shape of the conductive part 22 extending into the via 311 is circular, the shape of the via 311 can be a circular, square, or oblong.

[0169] It is understandable 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 without damaging the conductive part 22.

[0170] In the above technical solution, on the one hand, by providing a through hole 311 on the main body 36, the bracket 3 can serve to gather and accommodate the conductive part 22, which facilitates the connection between the conductive part 22 and the terminal post 12, and can improve the assembly reliability and convenience of the battery cell 10; on the other hand, by gathering the conductive part 22, the bracket 3 can eliminate the structure of the plastic part in the original battery cell 10, and the insulation between the entire active material coating part 21 and the shell 11 can be achieved through the cooperation of the bracket 3 and the insulating part 4, which can effectively reduce manufacturing and production costs.

[0171] Of course, the conductive part 22 can also be set on one side of the bracket 3, and the conductive part 22 has no cooperation with the bracket 3.

[0172] In some embodiments of this application, the support 3 can be an integral structure or a separate structure. Please refer to... Figure 16 When the bracket 3 is a one-piece structure, the through hole 311 is formed as a through hole penetrating the bracket 3. Therefore, the one-piece structure of the bracket 3 is easier to manufacture, has better reliability, and facilitates assembly between the bracket 3 and the housing assembly 1, improving assembly efficiency and fit stability. It is understandable that the manufacturing process of the bracket 3 can be selected based on its material. For example, when the bracket 3 is an insulating plastic part, an injection molding process can be used to obtain a one-piece structure for the bracket 3.

[0173] Please refer to Figure 17 When the bracket 3 is a split structure, the bracket 3 may include a separately formed first bracket 33 and a second bracket 34, with a through hole 311 defined between the first bracket 33 and the second bracket 34.

[0174] In the embodiments of this application, both the first bracket 33 and the second bracket 34 are elongated plate-like structures, and they can be detachably connected, for example, they can be plugged in or snapped together for easy assembly. Simultaneously, the first bracket 33 has a half-hole structure on the side near the second bracket 34, and the second bracket 34 also has a corresponding half-hole structure of a matching shape near the first bracket 33. The half-hole structures of the first bracket 33 and the second bracket 34 together form an annular through-hole 311. That is, the through-hole 311 is defined between the first bracket 33 and the second bracket 34.

[0175] 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, it is not necessary 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 ​​together 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.

[0176] As an optional solution, when the cross-section of the via 311 is elongated, 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 left and right, 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.

[0177] Please refer to Figure 18 , Figure 18 This is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of this application. A receiving groove 393 is provided on the side of the main body 36 away from the active material coating portion 21. The receiving groove 393 communicates with the through hole 311 and is used to accommodate at least a portion of the electrode post 12.

[0178] The shape of the receiving groove 393 can match the shape of the pole post 12. For example, when the cross-sectional shape of the pole post 12 is elongated, the shape of the receiving groove 393 can be a regular shape such as square, rectangle, ellipse, or oblong, or it can be an irregular shape; as another example, when the cross-sectional shape of the pole post 12 is circular, the shape of the receiving groove 393 can be a circular, square, or oblong shape.

[0179] It is understandable that the outer surface of the pole post 12 can be in direct contact with the side wall of the receiving groove 393, and there can also be a gap between the outer surface of the pole post 12 and the side wall of the receiving groove 393. As long as the pole post 12 is not damaged, at least a part of the pole post 12 can be accommodated in the receiving groove 393.

[0180] In the above technical solution, on the one hand, by accommodating at least part of the terminal post 12 through the receiving groove 393, the structure of the entire battery cell 10 is more compact and reliable, which is conducive to improving the energy density of the entire battery 100; on the other hand, by setting the receiving groove 393, the terminal post 12 can also be partially insulated from the housing 11 through the bracket 3, so as to further improve the stability and reliability of the battery cell 10; in addition, by accommodating the terminal post 12 through the receiving groove 393, the stability and reliability of the terminal post 12 can also be improved, so as to further improve the stability and reliability of the battery cell.

[0181] Please refer to this again. Figure 18 A positioning part 32 is provided on the side of the main body 36 away from the active material coating part 21. The positioning part 32 surrounds the circumference of the through hole 311 and extends towards the pole post 12.

[0182] In some embodiments, the positioning portion 32 may be an annular boss extending circumferentially along the through hole 311. In other embodiments, the positioning portion 32 may include two opposing boss structures located on opposite sides of the through hole 311. For example, the through hole 311 may form an elongated hole, and the two boss structures may be oppositely arranged in the width direction of the elongated hole, with each boss structure extending along the length direction of the elongated hole.

[0183] In the above technical solution, by setting the positioning part 32, during the assembly process of the bracket 3 and the pole post 12, the positioning part 32 and the through hole 311 are used to achieve positioning and installation of the bracket 3 and the pole post 12, which is beneficial to improve the assembly efficiency of the battery cell 10. When the conductive part 22 passes through the through hole 311, the positioning part 32 can bind, gather and support the conductive part 22, which is convenient to connect the conductive part 22 and the pole post 12, and can improve the assembly efficiency and assembly quality of the battery cell 10.

[0184] Please refer to this again. Figure 18 The electrode post 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 to guide the conductive portion 22 to be received in the receiving portion 121. That is to say, the electrode post 12 is configured as a hollow structure.

[0185] In the above technical solution, on the one hand, by setting the electrode post 12 as a hollow structure and cooperating with the positioning part 32 in the hollow structure, the conductive part 22 can be guided to connect with the electrode post 12, which can improve the connection reliability and ensure assembly efficiency and quality. On the other hand, the conductive part 22 can be accommodated in the receiving part 121, which improves the assembly efficiency of the conductive part 22 and saves the space occupied by the conductive part 22, making full use of the space of the battery cell 10. This makes the fit between the bracket 3 and the electrode post 12, and between the bracket 3 and the conductive part 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 between the positioning part 32 and the receiving part 121 can enable the bracket 3 and the electrode post 12 to be positioned and installed, which is beneficial to improving the assembly efficiency of the battery cell 10.

[0186] Please refer to this again. Figure 18 and further refer to Figure 19 , Figure 19 This is a cross-sectional view of the support 3 of the battery cell 10 according to some embodiments of this 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 through hole 311 and accommodates at least a portion of the conductive portion 22. The cross-sectional area of ​​the guide groove 312 gradually increases along the direction of the main body 36 near the active material coating portion 21.

[0187] Specifically, the wall of the guide groove 312 can be an inclined surface or an arc surface extending from the inside to the outside towards the active material coating part 21. Here, "inside" refers to the position near the center of the guide groove 312, and conversely, "outside" refers to the position away from the center of the guide groove 312, that is, the position near the edge of the guide groove 312.

[0188] The guide groove 312 can both accommodate the conductive part 22 and avoid damaging it, and also reduce the probability of the conductive part 22 becoming fluffy or folded, thus reducing redundancy.

[0189] Please refer to Figure 20 and Figure 21 , Figure 20 This is a top view of the support 3 of the battery cell 10 in some embodiments of this application. Figure 21 This is a top view of the support 3 of the battery cell 10 according to other embodiments of this application. In some embodiments, the support 3 has at least one first liquid injection channel 392, which is located on the side of the support 3 facing the active material coating portion 21.

[0190] During electrolyte injection, the electrolyte can flow along the first injection guide channel 392, providing a wetting path for the electrolyte. The first injection guide channel 392 also increases the fluidity of the electrolyte, improving the injection speed and reducing the formation settling time. Furthermore, the first injection guide channel 392 increases the contact area between the electrolyte and the active material coating section 21, reducing the problem of poor wetting of the active material coating section 21.

[0191] In this embodiment, at least one first liquid injection guide channel 392 is connected to the guide channel 312, and the electrolyte entering the housing 11 can flow along the first liquid injection guide channel 392 toward the guide channel 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.

[0192] Please refer to this again. Figure 20 In the embodiment where the support 3 is an integral structure and two pole posts 12 are provided on the housing 11, the two ends of the first liquid injection guide groove 392 can correspond to the positions of the two pole posts 12 respectively, and the two ends of the first liquid injection guide groove 392 are connected to the two guide grooves 312 respectively, so that the electrolyte can flow along the first liquid injection guide groove 392 toward the two guide grooves 312.

[0193] Please refer to this again. Figure 21 In an embodiment where the support 3 is a split structure and two pole posts 12 are provided on the housing 11, the support 3 may include a separately formed first support 33 and a second support 34. A through hole 311 is defined between the first support 33 and the second support 34. At least one first liquid injection guide groove 392 is provided on the first support 33 and the second support 34 respectively. The two ends of each first liquid injection guide groove 392 can correspond to the positions of the two pole posts 12 respectively, and the two ends of the first liquid injection guide groove 392 are connected to the two guide grooves 312 respectively. The electrolyte can flow along the first liquid injection guide groove 392 toward the two guide grooves 312.

[0194] In some embodiments, a second liquid injection channel (not shown in the figure) may also be provided on the support 3 as needed. The second liquid injection channel is located on the side of the support 3 opposite to the active material coating portion 21. With this arrangement, during liquid injection, the electrolyte can flow along the first liquid injection channel 392 and / or the second liquid injection channel, providing a wetting path for the electrolyte, increasing the fluidity of the electrolyte, improving the injection speed, and reducing the formation settling time.

[0195] It should be noted that in the embodiments of this application, the depth of the first injection guide groove 392 and / or the second injection guide groove is greater than or equal to 0.1 mm. For example, the depth of the first injection guide groove 392 and / or the second injection guide groove can be 0.1 mm, 0.2 mm, 0.5 mm, etc., and can be selected according to actual needs.

[0196] Please refer to this again. Figure 17 In the embodiments of this application, the conductive part 22 is connected to the side of the active material coating part 21 near the support 3. The electrode post 12 is provided with a receiving part 121, and at least a portion of the conductive part 22 is received in the receiving part 121 to guide the conductive part 22 to be received in the receiving part 121, so as to facilitate the electrical connection and cooperation between the conductive part 22 and the electrode post 12. That is to say, the electrode post 12 is set as a hollow structure.

[0197] This means, at least partially, that the conductive part 22 can be entirely housed within the receiving portion 121, or only partially within it. Because the terminal post 12 is provided with the receiving portion 121, the hollow structure of the receiving portion 121 can reduce the weight of the terminal post 12 to a certain extent, thereby increasing the weight energy density of the battery cell 10 and the battery 100. Simultaneously, by making the terminal post 12 a hollow structure and cooperating with the positioning portion 32 within the hollow structure, the conductive part 22 can be guided to connect to the terminal post 12, improving connection reliability and ensuring assembly efficiency and quality. Furthermore, the fact that the conductive part 22 can be housed within the receiving portion 121 improves the assembly efficiency of the conductive part 22 and saves space occupied by it, fully utilizing the space of the battery cell 10. This results in a tighter and more reliable fit between the support 3 and the terminal post 12, and between the support 3 and the conductive part 22, making the structure of the battery cell 10 more compact and facilitating the improvement of its energy density.

[0198] More specifically, by partially or entirely accommodating the conductive portion 22 within the receiving portion 121, the portion of the conductive portion 22 located within the receiving portion 121 can occupy space within the terminal post 12. This reduces 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 increasing the volumetric energy density of the battery cell 10. For example, when the conductive portion 22 is led out from the side of the active material coating portion 21 closest to the terminal post 12, the space occupied by the conductive portion 22 between the active material coating portion 21 and the terminal post 12 can be saved. This allows for an increase in the size of the active material coating portion 21 in the direction in which the conductive portion 22 is led out, reducing the distance between the active material coating portion 21 and the terminal post 12, and increasing the energy density of the battery cell 10.

[0199] Meanwhile, by accommodating at least a portion of the conductive part 22 within the receiving portion 121, the space occupied by the battery cell 10 itself can be reduced, allowing a larger number of battery cells 10 to be accommodated in the same volume of battery 100, and also increasing the volumetric energy density of battery 100. In addition, by accommodating at least a portion of the conductive part 22 within the receiving portion 121 to occupy the space within the terminal post 12, the redundancy of the conductive part 22 within the casing 11 can be reduced to at least a certain extent, reducing the probability of short circuit between the conductive part 22 and the active material coating portion 21, reducing the probability of short circuit in battery cell 10, and improving the operational reliability and stability of battery cell 10 and battery 100.

[0200] It should be noted that, in the embodiments of this application, the position of the receiving portion 121 can be located either on the side of the pole 12 facing the active material coating portion 21 or on the side of the pole 12 away from the active material coating portion 21.

[0201] For example, please refer to Figure 22 and Figure 23 , Figure 22 This is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of this application. Figure 23 This is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of this application. When the receiving portion 121 is located on the side of the electrode post 12 facing the active material coating portion 21, the receiving portion 121 includes a first receiving groove 12110, the surface of the electrode post 12 facing the active material coating portion 21 is the inner end face 122 of the electrode post, the groove opening of the first receiving groove 12110 is formed on the inner end face 122 of the electrode post, and at least a portion of the conductive portion 22 is received in the first receiving groove 12110.

[0202] For example, the first receiving groove 12110 is a groove body, which is a groove-shaped structure with a certain depth. For instance, when the pole post 12 is disposed on the upper end wall of the housing 11, and the inner end face 122 of the pole post is the lower surface of the pole post 12, the first receiving groove 12110 is formed as a receiving groove with the opening facing downward and the groove wall recessed upward. As another example, when the pole post 12 is disposed on the lower end wall of the housing 11, and the inner end face 122 of the pole post is the upper surface of the pole post 12, the first receiving groove 12110 is formed as a receiving groove with the opening facing upward and the groove wall recessed downward.

[0203] In the above technical solution, on the one hand, opening a first receiving groove 12110 on the electrode post 12 can reduce the weight of the electrode post 12 to a certain extent, thereby increasing the weight energy density of the battery cell 10 and the battery 100; on the other hand, since the opening of the first receiving groove 12110 is formed on the inner end face 122 of the electrode post, and the inner end face 122 of the electrode post 12 is the surface of the electrode post 12 near the active material coating part 21, the first receiving groove 12110 can open towards the active material coating part 21, thereby facilitating the insertion of the conductive part 22 into the first receiving groove 12110 and improving assembly efficiency. Moreover, this type of first receiving groove 12110 is easy to process and improves production efficiency.

[0204] Furthermore, the first receiving tank 12110 is easy to process into a larger volume, which can accommodate more conductive parts 22. At the same time, since the first receiving tank 12110 is open towards the active material coating part 21, it can also serve as a buffer and temporary storage structure for the electrolyte, allowing the casing 11 to hold more electrolyte. Since the battery cell 10 loses electrolyte during charging and discharging, more electrolyte can extend the service life of the battery cell 10. Also, because the first receiving tank 12110 is open towards the active material coating part 21, it can also serve as a receiving and buffering structure for gas generated inside the cell assembly 2, reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0205] In addition, since the first receiving groove 12110 is located inside the pole post 12, external foreign objects and impurities are not easy to enter the first receiving groove 12110, which can reduce the impact of external foreign objects and impurities on the cell assembly 2, improve the stability and reliability of the cell assembly 2, and thus improve the stability and reliability of the battery cell 10 and the battery 100.

[0206] Please refer to this again. Figure 22 In the embodiments of this application, the connection method between the electrode post 12 and the housing 11 is not limited; for example, it can be welding or riveting. For example, when the two are joined by riveting, the housing 11 has a mounting hole 113, and the electrode post 12 is riveted and installed in the mounting hole 113. Of course, it is understood that when the two are joined by welding or other methods, the housing 11 may also have a mounting hole 113 to facilitate the installation of the electrode post 12 into the housing 11 through the mounting hole 113; this is not limited here.

[0207] Meanwhile, the first receiving groove 12110 can be set at the position corresponding to the mounting hole 113. In other words, on the projection plane perpendicular to the axial direction R of the pole post 12, the orthographic projection of the first receiving groove 12110 is located within the orthographic projection range of the mounting hole 113, so that the first receiving 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 housing 11 to a greater extent.

[0208] Specifically, when the housing 11 has a mounting hole 113 and the pole post 12 is installed in the mounting hole 113, along the axial direction R of the pole post 12, the depth H1 of the first receiving groove 12110 is greater than or equal to the minimum distance H2 from the inner end face 122 of the pole post to the mounting hole 113.

[0209] It should be noted that the specific shape of the first receiving groove 12110 is not limited. It can be a regular shape or an irregular shape, such as a cylindrical groove with a rectangular, elliptical, or racetrack-shaped cross-section, a trapezoidal groove with a rectangular cross-section and gradually changing cross-sectional dimensions, a hemispherical groove with a circular cross-section and gradually changing cross-sectional dimensions, or a semi-ellipsoidal 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 post 12.

[0210] Since the depth H1 of the first receiving groove 12110 along the axial direction R of the electrode post 12 is greater than or equal to the minimum distance H2 from the inner end face 122 of the electrode post to the mounting hole 113, the volume of the electrode post 12 can be fully utilized, resulting in a larger depth of the first receiving groove 12110. This is beneficial for accommodating more conductive parts 22, thereby reducing the space occupied by the conductive parts 22 in the housing 11 to a greater extent, 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 first receiving groove 12110 has a larger depth, it can also accommodate the gas generated by the 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.

[0211] Please refer to this again. Figure 22 and Figure 23 In order to ensure the stability and reliability of the electrical connection between the active material coating part 21 and the electrode post 12, in some embodiments of this application, the electrical connection position between the conductive part 22 and the electrode post 12 can be located on the groove wall of the first receiving groove 12110 formed by the receiving part 121.

[0212] Exemplarily, the conductive part 22 and the electrode post 12 can be electrically connected by welding, with the electrical connection location being the welding position between the conductive part 22 and the electrode post 12. Furthermore, the welding method between the conductive part 22 and the electrode post 12 is not limited; for example, it can be laser welding. Depending on the position, angle, or structure of the welding location, vertical welding, inclined welding, lap welding, or edge sealing welding can be selected. In other embodiments of this application, the conductive part 22 and the electrode post 12 can also be electrically connected by other methods instead of welding, such as using conductive adhesive or conductive nails. For simplicity, the following description uses the example of the conductive part 22 and the electrode post 12 being electrically connected by welding, with the welding position being the electrical connection location between the conductive part 22 and the electrode post 12.

[0213] Specifically, the electrode post 12 includes a first end wall 12111 and a first side wall 12113. The first end wall 12111 is located on the 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 form a first receiving groove 12110. The electrical connection position between the conductive portion 22 and the electrode post 12 is located at the first end wall 12111 and / or the first side wall 12113. That is, the conductive portion 22 can be welded to at least one of the first end wall 12111 and the first side wall 12113.

[0214] In the above technical solution, by setting the electrical connection position between the conductive part 22 and the electrode post 12 on at least one of the first end wall 12111 and the first side wall 12113, the first receiving groove 12110 not only has the function of accommodating at least a portion of the conductive part 22, but the groove wall of the first receiving groove 12110 also has the function of electrically connecting with the conductive part 22. This simplifies the structure of the electrode post 12, facilitates the processing of the electrode post 12, and simplifies the structure of the conductive part 22, reduces redundancy in the conductive part 22, and lowers the cost of the conductive part 22. Moreover, by using the groove wall of the first receiving groove 12110 to achieve electrical connection with the conductive part 22, the area where the conductive part 22 is electrically connected to the electrode post 12 can be set relatively large, which not only reduces the difficulty of electrical connection, but also improves the reliability and stability of electrical connection, thereby improving the performance of the battery cell 10.

[0215] Furthermore, since the electrical connection between the conductive part 22 and the pole post 12 is located within the first receiving groove 12110, it not only prevents the electrical connection from protruding outside the pole post 12 and occupying space outside the pole post 12, but also allows the electrical connection to be protected by the pole post 12, thereby improving the reliability and stability of the electrical connection between the conductive part 22 and the pole post 12.

[0216] In addition, in the embodiments of this application, the first end wall 12111 is constructed as a closed structure without perforations, so as to isolate the first receiving groove 12110 from the external space of the housing 11, thereby avoiding the problem of electrolyte leakage from the first receiving groove 12110 inside the housing 11.

[0217] Please refer to this again. Figure 22 and Figure 23 In some alternative embodiments, the partial shape of the conductive portion 22 matches the partial shape of the first end wall 12111, and they are fitted together to achieve an electrical connection, such that the position where the conductive portion 22 is electrically connected to the first end wall 12111 extends along the length or width direction 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 fitted to the first end wall 12111, and an electrical connection, such as welding, can be performed at the fitted position. This increases the area of ​​the electrical connection and improves the reliability and stability of the electrical connection.

[0218] 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.

[0219] It is worth noting that the shape of the first end wall 12111 is not limited, for example, it can be a flat plate, an arc-shaped plate, etc. Among them, 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 post 12. For example, it can be a flat plate structure perpendicular to the axial direction R of the pole post 12, or it can be an inclined plate structure that is not perpendicular to the axial direction R of the pole post 12, but the inclination direction is not limited.

[0220] Of course, in other embodiments of this 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 portions that are welded to the first end wall 12111 respectively, which will not be elaborated here.

[0221] Please refer to Figure 24 , Figure 24This is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of this application. When the conductive portion 22 is electrically connected to the first end wall 12111, a first sink groove 12112 can be provided on the first end wall 12111, and the sinking direction of the first sink groove 12112 is away from the direction of 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 sink groove 12112. Exemplarily, at least a portion of the conductive portion 22 can be disposed within the first sink groove 12112 and connected to the portion of the first end wall 12111 used to define the first sink groove 12112.

[0222] In the above technical solution, on the one hand, the first sink 12112 can be used to pre-position and limit the electrical connection position of the conductive part 22, which is not only conducive to accurately finding the position to realize the electrical connection and improving production efficiency, but also conducive to improving the stability and reliability of the conductive part 22 and ensuring the stability and reliability of the charging and discharging process of the battery cell 10; on the other hand, by setting the first sink 12112 on the first end wall 12111, the local wall thickness of the first end wall 12111 can be locally reduced, which is not only conducive to welding, but also conducive to reducing the weight of the electrode post 12 and increasing the weight energy density of the battery cell 10.

[0223] Please refer to this again. Figure 23 and Figure 24 In this embodiment of the application, the electrode post 12 may also be provided with a first groove 126 as required. The first groove 126 is located on the side of the electrode post 12 away from the active material coating part 21. That is, the surface of the electrode post 12 away from the active material coating part 21 is the outer end face 123 of the electrode post, and the groove of the first groove 126 is formed on the outer end face 123 of the electrode post.

[0224] It is understood that the first groove 126 is a groove body, which is a groove-shaped structure with a certain depth. Furthermore, when the electrode post 12 is disposed on the upper end wall of the housing 11, and the outer end face 123 of the electrode post is the upper surface of the electrode post 12, the first groove 126 is formed with the groove opening facing upwards and the groove wall recessed downwards (i.e., recessed towards the square shape of the cell assembly 2). For example, when the electrode post 12 is disposed on the lower end wall of the housing 11, and the outer end face 123 of the electrode post is the lower surface of the electrode post 12, the first groove 126 is formed with the groove opening facing downwards and the groove wall recessed upwards (i.e., recessed away from the square shape of the cell assembly 2).

[0225] In the above technical solution, on the one hand, since the pole post 12 is provided with the first groove 126, the weight of the pole post 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 post 12, that is, it is open on the side of the pole post 12 facing away from the inside of the housing 11. The first groove 126 can be used to accommodate or install the structural components that electrically connect each battery cell 10 in the battery 100, so as to make full use of the space inside the pole post 12 and improve the space utilization rate and volume energy density of the battery 100.

[0226] Furthermore, since the electrode post 12 simultaneously has a first receiving groove 12110 and a first recess 126, and the first recess 126 is located on the side of the first receiving groove 12110 away from the active material coating portion 21, and the first recess 126 opens in the direction away from the first receiving groove 12110, it is convenient to perform laser welding of the conductive portion 22 to the first end wall 12111 from the outside of the electrode post 12, that is, the side of the electrode post 12 away from the active material coating portion 21, through the first recess 126. In other words, it is convenient to achieve electrical connection between the conductive portion 22 and the electrode post 12 through external welding. That is to say, with the above structural arrangement, it is convenient to perform external welding of the electrode post 12 and the conductive portion 22 through the first recess 126, which facilitates the processing and manufacturing of the battery cell 10 and can save processing and manufacturing costs.

[0227] Furthermore, in order to facilitate and effectively weld the conductive part 22 to the wall of the first receiving groove 12110 via the first groove 126, and to improve the welding reliability of the conductive part 22 to the wall of the first receiving groove 12110, in the embodiments of this application, the portion between the first groove 126 and the first receiving groove 12110 can be laser welded to the conductive part 22, that is, as shown in the figure. Figure 24 The spacer portion 127 shown is laser-welded to the conductive portion 22 to achieve electrical connection between the cell assembly 2 and the terminal post 12. The spacer portion 127 of the terminal post 12, located between the first groove 126 and the first receiving groove 12110, is relatively thin. The spacer portion 127 isolates the first groove 126 and the first receiving groove 12110. The side wall of the spacer portion 127 near the active material coating portion 21 can serve as the first end wall 12111. When the conductive portion 22 needs to be welded to the first end wall 12111, the relatively thin thickness of the spacer portion 127 facilitates the welding of the conductive portion 22 and the first end wall 12111 through the first groove 126, improving the convenience and reliability of the welding.

[0228] 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 shape, etc. The weld mark formed by welding the conductive part 22 to the terminal post 12 can be an elongated weld mark parallel to the length direction of the first receiving groove 12110, so as to improve welding reliability and increase current carrying capacity. For example, when the weld mark formed by welding the conductive part 22 to the first end wall 12111 is an elongated 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, so as to ensure the current carrying capacity of the battery cell 10 while ensuring welding convenience and reliability.

[0229] Please refer to this again. Figure 23 Furthermore, the battery cell 10 may also include a slot cover 7, which is disposed on the terminal post 12 and covers the slot opening of the first groove 126.

[0230] In the above technical solution, by providing a groove cover 7 to seal the first groove 126, the terminal post 12 can be indirectly electrically connected to the busbar component through the groove cover 7. By setting the position and structure of the groove cover 7, the electrical connection between the groove cover 7 and the busbar component is more convenient and the electrical connection area is larger. Therefore, by providing the groove cover 7, the electrical connection between adjacent battery cells 10 within the battery 100 can be facilitated. Furthermore, since the electrical connection between battery cells 10 is located at the groove cover 7, the electrical connection between the battery cells 10 and the conductive part 22 and the terminal post 12 can be separated by the first groove 126, resulting in less interference between them and further improving the stability and reliability of the battery cells 10.

[0231] For example, please refer to Figure 25 , Figure 25 The present invention provides a partial cross-sectional view of a battery cell 10 according to some embodiments. The receiving portion 121 may also be configured to include a second receiving groove 12120. The surface of the electrode post 12 away from the active material coating portion 21 is the outer end face 123 of the electrode post. The groove opening of the second receiving groove 12120 is formed on the outer end face 123 of the electrode post. The second receiving groove 12120 is connected to the interior of the housing 11 through a through hole 12130. The conductive portion 22 passes through the through hole 12130 and is at least partially received in the second receiving groove 12120.

[0232] It is understood that the second receiving groove 12120 is a groove body, which is a groove-shaped structure with a certain depth. For example, when the pole post 12 is set on the upper end wall of the housing 11, and the outer end face 123 of the pole post is the upper surface of the pole post 12, the second receiving groove 12120 is formed as a receiving groove with the groove opening facing upward and the groove wall concave downward. As another example, when the pole post 12 is set on the lower end wall of the housing 11, and the outer end face 123 of the pole post is the lower surface of the pole post 12, the second receiving groove 12120 is formed as a receiving groove with the groove opening facing downward and the groove wall concave upward.

[0233] In the above technical solutions, please refer again Figure 25 On the one hand, the second receiving groove 12120 provided on the terminal post 12 can reduce the weight of the terminal post 12 to a certain extent, thereby improving the weight energy density of the battery cell 10 and the battery 100. On the other hand, since the opening of the second receiving groove 12120 is formed on the outer end face 123 of the terminal post, and the outer end face 123 of the terminal post is the surface of the terminal post 12 away from the active material coating part 21, the second receiving groove 12120 can be opened in the direction away from the active material coating part 21. In this way, when at least a part of the conductive part 22 is accommodated in the second receiving groove 12120, the conductive part 22 can be easily stored and organized through the opening of the second receiving groove 12120, and the electrical connection operation between the conductive part 22 and the terminal post 12 can be easily performed through the opening 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.

[0234] Meanwhile, since the second receiving groove 12120 can communicate with the interior of the housing 11 through the perforation 12130, the second receiving groove 12120 can also serve as a buffer and temporary storage structure for the electrolyte, allowing the housing 11 to hold more electrolyte. Since the battery cell 10 loses electrolyte during charging and discharging, more electrolyte can extend the service life of the battery cell 10. Also, because the second receiving groove 12120 can communicate with the interior of the housing 11 through the perforation 12130, the second receiving groove 12120 can also serve as a receiving and buffering structure for gas generated inside the cell assembly 2, reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0235] It is worth noting that when the receiving part 121 has a second receiving groove 12120, and the conductive part 22 passes through the through hole 12130 and is at least partially received in the second receiving groove 12120, the electrical connection position between the conductive part 22 and the pole post 12 is not limited.

[0236] For example, when the conductive part 22 passes through the through hole 12130 and is at least partially accommodated in the second receiving groove 12120, in the embodiments of this application, the electrical connection position between the conductive part 22 and the pole post 12 is located on the hole wall of the through hole 12130 formed by the pole post 12.

[0237] In the above technical solution, by setting the electrical connection position between the conductive part 22 and the electrode post 12 on the wall of the through hole 12130, it is convenient to perform electrical connection operation between the conductive part 22 and the electrode post 12 through the second receiving groove 12120. Moreover, when the electrical connection area between the conductive part 22 and the electrode post 12 is large, the through hole 12130 can be sealed by the electrical connection between the conductive part 22 and the electrode post 12, so as to save sealing costs, reduce electrolyte leakage, and save sealing parts.

[0238] Specifically, the conductive part 22 can be welded to the hole wall of the perforation 12130 at the position where the perforation 12130 is connected to the second receiving groove 12120. This is convenient for operation, and the perforation 12130 can be sealed by controlling the solder stamp and the conductive part 22, thereby improving the problem of electrolyte leakage from the perforation 12130 inside the housing 11.

[0239] As another example, when the conductive part 22 passes through the through hole 12130 and is at least partially accommodated within the second receiving groove 12120, in some other embodiments of this application, the electrical connection position between the conductive part 22 and the electrode post 12 can also be located on the groove wall of the second receiving groove 12120 formed by the electrode post 12. This facilitates electrical connection operations; for example, when the conductive part 22 is welded to the groove wall of the second receiving groove 12120 formed by the electrode post 12, it can reduce the occurrence of problems such as conductive particles generated during welding entering the housing 11 and causing short circuits.

[0240] Please refer to this again. Figure 25 The electrode post 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 near the active material coating portion 21. The second end wall 12121 and the second side wall 12123 form a second receiving groove 12120. A through hole 12130 is opened in the second end wall 12121. The electrical connection position between the conductive portion 22 and the electrode post 12 is located in the second end wall 12121 and / or in the second side wall 12123.

[0241] More specifically, the conductive part 22 and the electrode post 12 can be electrically connected by welding, so the welding position is the electrical connection position between the conductive part 22 and the electrode post 12. In other embodiments of this application, the conductive part 22 and the electrode post 12 can also be electrically connected by other means instead of welding, such as by using conductive adhesive or conductive nails, which will not be elaborated here.

[0242] For simplicity, the following description will use the example of the conductive part 22 being welded to the electrode post 12 to form an electrical connection, with the welding position being the electrical connection position between the conductive part 22 and the electrode post 12. For example, in some embodiments, the electrical connection position between the conductive part 22 and the electrode post 12 is located at the second end wall 12121 and / or the second side wall 12123, which can be the welding of the conductive part 22 to at least one of the second end wall 12121 and the second side wall 12123.

[0243] In the above technical solution, by setting the electrical connection position between the conductive part 22 and the pole post 12 on at least one of the second end wall 12121 and the second side wall 12123, the second receiving groove 12120 not only has the function of accommodating at least a portion of the conductive part 22, but the groove wall of the second receiving groove 12120 also has the function of electrically connecting with the conductive part 22. This simplifies the structure of the pole post 12 and facilitates its processing. Moreover, since the through hole 12130 is opened in the second end wall 12121, the conductive part 22 can easily extend into the second receiving groove 12120 through the through hole 12130. This simplifies the structure of the conductive part 22, reduces redundancy in the conductive part 22, and lowers the cost of the conductive part 22. Furthermore, the open direction of the second receiving groove 12120 allows for easy electrical connection between the conductive part 22 and the groove wall of the second receiving groove 12120 through the groove opening, which reduces the difficulty of electrical connection. Moreover, by using the groove wall of the second receiving groove 12120 to achieve electrical connection with the conductive part 22, the area of ​​electrical connection between the conductive part 22 and the terminal post 12 can be relatively large, which can improve the reliability and stability of electrical connection, thereby improving the performance of the battery cell 10.

[0244] Furthermore, since the electrical connection between the conductive part 22 and the pole post 12 is located within the second receiving groove 12120, it not only prevents the electrical connection from protruding outside the pole post 12 and occupying space outside the pole post 12, but also allows the electrical connection to be protected by the pole post 12, thereby improving the reliability and stability of the electrical connection between the conductive part 22 and the pole post 12.

[0245] Please refer to this again. Figure 25 In some embodiments, the partial shape of the conductive portion 22 matches the partial shape of the second end wall 12121, and they are fitted together to achieve an electrical connection, such that the position where the conductive portion 22 is electrically connected to the second end wall 12121 extends along the length or width direction of the second end wall 12121. For example, when the second end wall 12121 is planar, a portion of the conductive portion 22 can also be planar and fitted to the second end wall 12121, and an electrical connection, such as welding, can be performed at the fitted position. This increases the area of ​​the electrical connection and improves the reliability and stability of the electrical connection.

[0246] It is worth noting that the shape of the second end wall 12121 is not limited, for example, it can be a flat plate or an arc-shaped plate structure. When the second end wall 12121 is a flat plate structure, the second end wall 12121 is arranged at an angle to the axial direction R of the pole post 12. For example, it can be a flat plate structure perpendicular to the axial direction R of the pole post 12, or it can be an inclined flat plate structure that is not perpendicular to the axial direction R of the pole post 12, but the direction of inclination is not limited.

[0247] For example, please refer to again Figure 25 When the second end wall 12121 has a flat plate structure, the angle θ between the second end wall 12121 and the axial direction R of the pole post 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 and the active material coating part 21 are equally spaced. This facilitates the welding of the conductive part 22 to the second end wall 12121.

[0248] For example, the angle θ between the second end wall 12121 and the axial direction R of the pole post 12 is greater than 90°, that is, along the direction from the perforation 12130 to the second side wall 12123, the second end wall 12121 extends obliquely toward the active material coating portion 21. Therefore, the extension distance of the conductive portion 22 along the second end wall 12121 can be increased, thereby increasing the reliability of the electrical connection. For example, the angle θ between the second end wall 12121 and the axial direction R of the pole post 12 can be 90°-145°, such as 100°, 110°, 120°, 130°, 140°, etc., which on the one hand makes the second end wall 12121 easier to process and facilitates electrical connection with the conductive portion 22, and on the other hand allows for more efficient use of the space within the pole post 12 to accommodate the conductive portion 22.

[0249] For example, the angle θ between the second end wall 12121 and the axial direction R of the pole post 12 is less than 90°, that is, along the direction from the perforation 12130 to the second side wall 12123, the second end wall 12121 extends obliquely away from the active material coating portion 21. Therefore, the extension distance of the conductive portion 22 along the second end wall 12121 can be increased, thereby increasing the reliability of the electrical connection. For example, the angle θ between the second end wall 12121 and the axial direction R of the pole post 12 can be 45°-90°, such as 50°, 60°, 70°, 80°, etc. This makes the second end wall 12121 easier to process and facilitates electrical connection with the conductive portion 22, and also allows for more efficient use of the space within the pole post 12 to accommodate the conductive portion 22.

[0250] Of course, this application is not limited to this. In other embodiments of this 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. Instead, it may be a plurality of discretely arranged points. For example, the conductive part 22 has a plurality of spaced-apart portions that are welded to the second end wall 12121 respectively. This will not be elaborated here.

[0251] Please refer to this again. Figure 25 and further refer to Figure 26 , Figure 26 This is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of this application. Regardless of the specific value of the angle θ between the second end wall 12121 and the axial direction R of the terminal post 12, in the embodiments of this application, when the conductive part 22 is electrically connected to the second end wall 12121, a second recess 12122 can be provided on the second end wall 12121 as needed. The second recess 12122 is a groove formed by a portion of the second end wall 12121 sinking down towards the end near the active material coating. The position where the conductive part 22 is electrically connected to the second end wall 12121 is at least partially located within the second recess 12122.

[0252] In the above technical solution, the part of the conductive part 22 located in the second sink 12122 is configured to match the shape of the second sink 12122 and fit together to achieve electrical connection. The second sink 12122 can be used to pre-position and limit the electrical connection position of the conductive part 22, which is conducive to accurately finding the position to achieve electrical connection, improving production efficiency, and improving the stability and reliability of the electrical connection position, so as to ensure the reliability and stability of the charging and discharging operation of the battery cell 10.

[0253] Please refer to this again. Figure 26 In the embodiments of this application, the connection method between the pole piece 12 and the housing 11 is not limited. For example, it can be welding or riveting. For instance, when the two are joined by riveting, the housing 11 has a mounting hole 113, and the pole piece 12 is riveted and installed in the mounting hole 113. Of course, it is understood that when the two are joined by welding or other methods, the housing 11 may also have a mounting hole 113, and the pole piece 12 is installed in the mounting hole 113.

[0254] Optionally, please refer to again Figure 25 The second receiving groove 12120 can be set at the position corresponding to the mounting hole 113. In other words, on the projection plane perpendicular to the axial direction R of the pole post 12, the orthographic projection of the second receiving groove 12120 is located within the orthographic projection range of the mounting hole 113, so that the second receiving 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 housing 11 to a greater extent.

[0255] In some embodiments, please refer again Figure 25 When the housing 11 has a mounting hole 113 and the pole post 12 is installed in the mounting hole 113, along the axial direction R of the pole post 12, the depth H3 of the second receiving groove 12120 is greater than or equal to the minimum distance H4 from the outer end face 123 of the pole post to the mounting hole 113.

[0256] It should be noted that the specific shape of the second receiving groove 12120 is not limited. It can be a regular shape or an irregular shape, such as a cylindrical groove with a rectangular, elliptical, or racetrack-shaped cross-section, a trapezoidal groove with a rectangular cross-section and gradually changing cross-sectional dimensions, a hemispherical groove with a circular cross-section and gradually changing cross-sectional dimensions, or a semi-ellipsoidal groove with an elliptical cross-section and gradually changing cross-sectional dimensions, etc. It is worth noting that the racetrack shape mentioned in this article refers to a shape in which the two short sides of a rectangle are replaced by outwardly convex curves.

[0257] Therefore, the depth H3 of the second receiving groove 12120 refers to the maximum depth of the second receiving groove 12120 along the axial direction R of the electrode post 12. Since the depth H3 of the second receiving groove 12120 along the axial direction R of the electrode post 12 is greater than or equal to the minimum distance H4 from the outer end face 123 of the electrode post to the mounting hole 113, the volume of the electrode post 12 can be fully utilized, resulting in a larger depth of the second receiving groove 12120. This is beneficial for accommodating more conductive parts 22, thereby reducing the space occupied by the conductive parts 22 in the housing 11 to a greater extent, 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 larger depth, it can also accommodate the gas generated by the 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.

[0258] Please refer to Figure 36, and further refer to... Figure 27 and Figure 28 , Figure 27 This is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of this application. Figure 28 for Figure 27 The exploded view of the battery cell 10 shown is shown in the embodiment of this application. When the receiving part 121 has the second receiving groove 12120 of any of the above embodiments, the battery cell 10 may optionally further include a first cover plate 13. The first cover plate 13 cooperates with the terminal post 12 and closes the opening of the second receiving groove 12120. The first cover plate 13 is electrically connected to the terminal post 12.

[0259] In the above technical solution, by setting the first cover plate 13 to close the opening of the second receiving groove 12120, the electrolyte in the housing 11 can be prevented from leaking out of the opening of the second receiving groove 12120. Moreover, since the first cover plate 13 closes the opening of the second receiving groove 12120 and is electrically connected to the electrode post 12, the electrode post 12 and the busbar component can be easily connected indirectly by the first cover plate 13. This also helps to increase the connection area at the electrical connection point, thereby helping to reduce the resistance at the electrical connection point.

[0260] It is worth noting that the method and position of the first cover plate 13 and the pole post 12 are not limited, as long as the first cover plate 13 can close the opening of the second receiving groove 12120. For example, in some embodiments, the first cover plate 13 can be welded to the pole post 12. During processing, the conductive part 22 can be passed through the through hole 12130 and welded to the groove wall of the second receiving groove 12120 first, and then the first cover plate 13 can be welded to the pole post 12 to close the opening of the second receiving groove 12120.

[0261] It should also be noted that the specific configuration of the first cover plate 13 is not limited. For example, in some alternative embodiments, Figure 29 for Figure 28 Please refer to the exploded structural diagram of the first cover plate shown below. Figures 27-29 The first cover plate 13 includes a first conductive element 131 and a second conductive element 132 made of different materials. The first conductive element 131 is engaged with and electrically connected to the pole post 12, and the second conductive element 132 is engaged with and electrically connected to the first conductive element 131.

[0262] In the above technical solution, the first cover plate 13 is configured as a composite form, and the first conductive element 131 is made of the same material as the terminal post 12, thereby facilitating the electrical connection between the first conductive element 131 and the terminal post 12. For example, the first conductive element 131 and the terminal post 12 can be reliably and stably connected by welding. Furthermore, since the second conductive element 132 is made of a different material than the first conductive element 131, it is convenient to use the second conductive element 132 to make electrical connections with busbar components made of a different material than the terminal post 12. For example, the second conductive element 132 can be reliably and stably connected with busbar components made of the same material as the second conductive element 132 by welding.

[0263] For example, when the terminal 12 is the negative terminal, and the terminal 12 is made of copper and the busbar is made of aluminum, the first conductive element 131 can be made of copper and the second conductive element 132 can be made of aluminum. In this case, the terminal 12 and the first conductive element 131 are made of the same material and can be effectively welded, and the second conductive element 132 is made of the same material and can also be effectively welded, thus effectively achieving an indirect electrical connection between the terminal 12 and the busbar through the first cover plate 13. Furthermore, the welding of the terminal 12 and the first conductive element 131, which are made of copper, has good fluidity, is less prone to cracking, and helps improve the sealing effect at the weld.

[0264] Please refer to this again. Figures 27-29 In some alternative examples, the first conductive element 131 is located between the second receiving tank 12120 and the second conductive element 132. In the above technical solution, since the first conductive element 131 is located between the second receiving tank 12120 and the second conductive element 132, the second receiving tank 12120 and the second conductive element 132 can be separated. Thus, when the electrolyte in the housing 11 enters the second receiving tank 12120 through the perforation 12130, the first conductive element 131 can be used to prevent this part of the electrolyte from contacting the second conductive element 132, thereby solving the problem of electrolyte corrosion of the second conductive element 132.

[0265] It is worth noting that the cooperation method between the first conductive element 131 and the second conductive element 132 is not limited. For example, in some embodiments, please refer to... Figures 27-29 The first conductive element 131 has a second groove 1311, and the second conductive element 132 is embedded in the second groove 1311. The opening of the second groove 1311 is formed on the surface of the first conductive element 131 on the side away from the second receiving groove 12120, so that the second conductive element 132 is exposed through the opening of the second groove 1311. Alternatively, in other embodiments, the connection method of the first conductive element 131 and the second conductive element 132 can also be a fastening connection, snap-fit, etc.

[0266] It should also be noted that the "exposed" in the phrase "the second conductive element 132 is exposed by the groove opening of the second groove 1311" means that the first conductive element 131 does not obstruct the second conductive element 132 at the groove opening position of the second groove 1311. It is not required that the second conductive element 132 protrude from the groove opening of the second groove 1311. For example, the second conductive element 132 can be flush with the surface of the first conductive element 131 on the side away from the second receiving groove 12120, or the second conductive element 132 can protrude from the surface of the first conductive element 131 on the side away from the second receiving groove 12120.

[0267] In the above technical solution, on the one hand, by embedding the second conductive element 132 within the first conductive element 131, the assembly difficulty of the first conductive element 131 and the second conductive element 132 can be reduced, the stability and convenience of the cooperation between the first conductive element 131 and the second conductive element 132 can be improved, and the thickness of the first cover plate 13 can be reduced, thus reducing the space occupied by the first cover plate 13 and improving the space utilization rate of the battery cell 10. On the other hand, since the second conductive element 132 can be exposed from the surface of the first conductive element 131 away from the second receiving groove 12120 through the slot of the second groove 1311, it is beneficial to realize the electrical connection between the second conductive element 132 and the busbar component outside the terminal post 12.

[0268] Furthermore, since the opening 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. As a result, the portion of the first conductive member 131 that defines the groove wall of the second groove 1311 is located between the second receiving groove 12120 and the second conductive member 132, thereby separating 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 and reducing electrolyte leakage.

[0269] Of course, in other embodiments, the first cover plate 13 may not be a composite material made of multiple materials, as in other embodiments of this application. Figure 30 This is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application. Figure 31 for Figure 30 Please refer to the exploded view of the battery cell shown below. Figure 30 and Figure 31 Alternatively, the first cover plate 13 can be made entirely of the same material in a non-composite form, for example, to adapt to the positive electrode post, which will not be elaborated here.

[0270] Please refer to this again. Figures 27-29 In some embodiments, the first cover plate 13 is also embedded in the opening of the second receiving groove 12120. In the above technical solution, by embedding the first cover plate 13 within the second receiving groove 12120, the assembly difficulty of the first cover plate 13 and the electrode post 12 can be reduced, the assembly stability of the first cover plate 13 and the electrode post 12 can be improved, as well as the reliability and convenience of the connection. Furthermore, the space occupied by the first cover plate 13 outside the electrode post 12 can be reduced. Moreover, since the first cover plate 13 is embedded in the opening of the second receiving groove 12120, the second receiving groove 12120 can have sufficient space to accommodate the conductive part 22.

[0271] Of course, in other embodiments of this application, the first cover plate 13 and the pole post 12 are 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 post 12, that is, directly covered on the opening of the second receiving groove 12120, so as to facilitate cooperation with the current collection component of the battery 100. This embodiment does not limit this.

[0272] Please refer to this again. Figures 27-29 Optionally, in an embodiment of this application, at least a portion of the wall surface at the opening of the second receiving groove 12120 formed by the pole post 12 is a guide slope 12126, which guides the first cover plate 13 to engage with the opening of the second receiving groove 12120. In the above technical solution, by processing the wall surface at the opening of the second receiving groove 12120 into a guide slope, the assembly difficulty of the first cover plate 13 and the second receiving groove 12120 can be reduced, and the assembly efficiency of the first cover plate 13 and the second receiving groove 12120 can be improved. Furthermore, when the first cover plate 13 is welded to the guide slope 12126, the area of ​​the weld joint can be increased, improving the reliability of the weld connection between the first cover plate 13 and the pole post 12, and mitigating the problems of molten pool collapse or laser penetration into the pole post 12 during welding.

[0273] Specifically, please refer to Figures 27-29 The second receiving groove 12120 includes a first groove segment 12124 and a second groove segment 12125 located on the side of the first groove segment 12124 near the outer end face 123 of the pole post. The cross-sectional area of ​​the second groove segment 12125 is larger than that of the first groove segment 12124, making the second receiving groove 12120 a stepped groove, and forming a third step surface 12127 at the connection position of the first groove segment 12124 and the second groove segment 12125. This allows the first cover plate 13 to be specifically embedded in the second groove segment 12125 and supported on the third step surface 12127 when it is embedded in the second receiving groove 12120.

[0274] In the above technical solution, by setting the second receiving groove 12120 as a stepped groove, the first cover plate 13 can be stably fitted at the groove opening of the second receiving groove 12120, thereby improving the connection stability between the first cover plate 13 and the pole post 12. Moreover, by limiting the groove depth of the first groove segment 12124, the second receiving groove 12120 can have sufficient space to accommodate the conductive part 22.

[0275] Furthermore, when the wall surface at the opening of the second receiving groove 12120 formed by the pole post 12 is a guide slope 12126, the cross-sectional area of ​​the second groove segment 12125 can be set to gradually increase along the direction close to the outer end face 123 of the pole post, so that the side wall of the second groove segment 12125 is formed as a guide slope 12126, which facilitates processing and can simply and effectively meet the guiding requirements.

[0276] Please refer to this again. Figures 27-29 In embodiments of this application, the first cover plate 13 may also have a stress relief groove 133 as needed. The stress relief groove 133 is located in the outer peripheral area of ​​the first cover plate 13 to assist the first cover plate 13 in stress relief. In the above technical solution, by providing a stress relief groove 133 on the first cover plate 13, the stress generated by the first cover plate 13 during its own processing or during the electrical connection between the first cover plate 13 and the pole post 12 can be released, thereby improving problems such as deformation or damage of the first cover plate 13 caused by stress.

[0277] Specifically, when the first cover plate 13 is embedded and welded to the second receiving groove 12120, the stress relief groove 133 can be used to release the stress generated by welding, improve the lateral heat conduction, and reduce the probability of damage or deformation of the first cover plate 13. Simultaneously, when the first cover plate 13 is a composite form including the first conductive element 131 and the second conductive element 132, the stress relief groove 133 can be disposed on the first conductive element 131 and located in the outer peripheral area of ​​the second conductive element 132. When the first conductive element 131 is embedded and welded to the second receiving groove 12120, the stress relief groove 133 can be used to release the stress generated by welding, improve the lateral heat conduction, and reduce the probability of damage or deformation of the second conductive element 132. Furthermore, when the second conductive element 132 is embedded and welded to the first conductive element 131, the stress relief groove 133 can be used to release the stress generated by welding, improve the lateral heat conduction, and reduce the probability of deformation of the first conductive element 131, which could prevent the first conductive element 131 from being embedded in the second receiving groove 12120.

[0278] Please refer to Figures 30-31 In the embodiments of this application, the battery cell 10 may also be provided with a second cover plate 14 as needed. The second cover plate 14 covers the outside of the through hole 12130 and is located outside the conductive part 22 in the second receiving groove 12120.

[0279] 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 at the same time. 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 material made of multiple materials, or it may be a non-composite material made of the same material.

[0280] In the above technical solution, at least a portion of the conductive part 22 is located in the second receiving tank 12120, and the second cover plate 14 is provided on the conductive part 22. The second cover plate 14 also covers the perforation 12130, so that when the electrolyte enters the second receiving tank 12120 from the perforation 12130, the problem of the electrolyte overflowing from the electrode post 12 can be improved by the second cover plate 14, thereby improving the reliability of the battery cell 10.

[0281] For example Figures 30-31 As shown, when a portion of the conductive part 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 part 22, the second cover plate 14, and the second end wall 12121 together, thereby improving the reliability of the connection between the electrode post 12 and the conductive part 22. Furthermore, since the second cover plate 14 can press the conductive part 22 firmly, the stability of the conductive part 22 within the second receiving groove 12120 can be improved.

[0282] Please refer to Figure 32 , Figure 32 This is an assembly diagram of a battery cell 10 according to some embodiments of this application. The number of openings 1110 on the housing 111 is one, the housing cover 112 covers the opening 1110, and the bracket 3 is located at the end of the cell assembly 2 away from the opening 1110.

[0283] The opening 1110 can be located on the top wall, bottom wall, or side wall of the housing 111. When the opening 1110 is located on the bottom wall of the housing 111, the other walls are closed structures. The battery cell assembly 2 with the bracket 3 and the insulator 4 can only be installed into the housing 111 through the opening 1110. After the battery cell assembly 2 is installed in place in the housing 111, the cover 112 is closed on the opening 1110 to seal the opening 1110. The insulator 4 is pressed between the top wall of the housing 111 and the bracket 3, which can reduce the risk of the insulator 4 falling off, reduce the risk of the battery cell assembly 2 failing due to exposure, and reduce the risk of the housing 11 being corroded, thereby improving the reliability and stability of the battery cell 10.

[0284] In the above technical solution, an opening 1110 is provided on the shell 111, and the bracket 3 is set at the end of the cell assembly 2 away from the opening 1110. The cell assembly 2 with the bracket 3 and the insulating part 4 can only be installed into the shell 111 through the opening 1110. The insertion direction is unique, which helps to improve the installation efficiency. Furthermore, 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. This 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 thus reduce the risk of the shell 11 being corroded due to the cell assembly 2 being exposed. This also reduces the risk of the cell assembly 2 failing and the risk of leakage, thereby improving the reliability and stability of the battery cell 10.

[0285] Optionally, all the terminals 12 can be located on the housing 112, that is, all the terminals 12 are located on the side of the cell assembly 2 away from the support 3, and the conductive part 22 can be electrically connected to the corresponding terminals 12 on the housing 112.

[0286] Optionally, one of the terminals 12 may be located on the cover 112, and the other terminal 12 may be located on the end wall of the body 111 opposite to the opening 1110. One of the conductive parts 22 may be electrically connected from the terminal 12 on the cover 112.

[0287] Optionally, all the poles 12 can be evenly disposed on the end wall of the housing 111 opposite to the opening 1110, and the conductive part 22 can pass through the bracket 3 and be electrically connected to the poles 12 on the end wall of the housing 111.

[0288] Please refer to this again. Figure 32 The housing 111 has a mounting wall 1112 opposite to the opening 1110, and at least one terminal post 12 is provided on the mounting wall 1112. In this way, the cell assembly 2 enters the housing 111 through the opening 1110, and the conductive part 22 is directly opposite to the terminal post 12, which makes it easier for the conductive part 22 to be connected to the terminal post 12, thereby improving the assembly efficiency of the battery cell 10.

[0289] For example, the top wall of the housing 111 is a mounting wall 1112, the bottom wall of the housing 111 has an opening 1110, the cover 112 is provided at the bottom of the housing 111, and the battery cell assembly 2 can be installed into the housing 111 from bottom to top along the Z direction, so that the conductive part 22 can be easily connected to the terminal 12.

[0290] Please refer to Figure 33 , Figure 33 This is an assembly diagram of a battery cell 10 according to other embodiments of this application. There are two openings 1110 on the housing 111, and a cover 112 is fitted over each opening 1110. The bracket 3 is located at the end of the cell assembly 2 away from either opening 1110.

[0291] In the above technical solution, two openings 1110 are provided on the shell 111, and a bracket 3 is provided at the end of the cell assembly 2 away from either opening 1110. The cell assembly 2 with two brackets 3 and an insulating member 4 can be installed into the shell 111 from either opening 1110. The appropriate insertion direction can be selected as needed. After the cell assembly 2 is installed in the shell 111, a part of the insulating member 4 can be pressed between the wall of the shell 111 opposite to one of the openings 1110 and the corresponding bracket 3, and the other part of the insulating member 4 can be pressed between the wall of the shell 111 opposite to the other opening 1110 and the corresponding bracket 3. This further reduces the risk of the insulating member 4 falling off, reduces the risk of the cell assembly 2 failing due to exposure, and reduces the risk of the shell 11 being corroded, thereby improving the reliability and stability of the battery cell 10.

[0292] The two openings 1110 can be located on the top wall, bottom wall, or side wall of the shell 111. The two openings 1110 can be provided on two opposite walls of the shell 111, for example, on the top and bottom walls of the shell 111 respectively; or, for another example, on two opposite side walls of the shell 111 respectively. The two openings 1110 can also be provided on two adjacent walls of the shell 111, for example, on the top and side walls of the shell 111 respectively; or, for yet another example, on the bottom and side walls of the shell 111 respectively; or, for yet another example, on two adjacent side walls of the shell 111 respectively.

[0293] When two openings 1110 are respectively provided on two opposite walls of the shell 111, and the remaining walls are closed structures, one opening 1110 covers the first shell cover 1121, and the other opening 1110 covers the second shell cover 1122. All pole posts 12 can be provided on the first shell cover 1121, or all pole posts 12 can be provided on the second shell cover 1122, or some pole posts 12 can be provided on the first shell cover 1121 or the second shell cover 1122, and other pole posts 12 can be provided on the shell 111.

[0294] Please refer to this again. Figure 33Each of the first and second housing covers 1121 and 1122 is provided with a terminal post 12. Each end of the battery cell assembly 2 is provided with a bracket 3. The battery cell assembly 2 with the bracket 3 and the insulating part 4 can be installed into the housing 111 through any one of the openings 1110. After the battery cell assembly 2 is installed in the housing 111, the two housing covers 112 are respectively closed on the two openings 1110 to seal the corresponding openings 1110. After the battery cell assembly 2 with the two brackets 3 is installed in the housing, one of the conductive parts 22 passes through one bracket 3 and is electrically connected to the terminal post 12 on the first housing cover 1121, and the other conductive part 22 passes through the other bracket 3 and is electrically connected to the terminal post 12 on the second housing cover 1122.

[0295] In some embodiments, at least one terminal post 12 is provided on the shell wall of the housing 11 adjacent to the support 3. The cell assembly 2 with the support 3 and the insulator 4 enters the housing 111 through the opening 1110, and the conductive part 22 is directly opposite the terminal post 12, which makes it easier to connect the conductive part 22 to the terminal post 12 and improves the assembly efficiency of the battery cell 10.

[0296] Please refer to this again. Figures 3-6 This describes a specific embodiment of the battery cell 10 in this application.

[0297] In the embodiments of this application, the battery cell 10 is cuboid in shape. The height direction of the battery cell 10 is a first direction Z, the length direction of the battery cell 10 is a second direction X, and the thickness direction of the battery cell 10 is a third direction Y. The battery cell 10 includes a housing 11, which includes a shell body 111 and a shell cover 112. The shell body 111 has a square annular structure, with one end open along the first direction Z and the other end closed along the first direction Z. The shell cover 112 covers the open position of the shell body 111. Two terminals 12 are provided at the closed end of the shell body 111 along the first direction Z. The two terminals 12 are spaced apart along the second direction X to be a positive terminal and a negative terminal, respectively.

[0298] Both pole posts 12 are provided with receiving portions 121. The receiving portion 121 includes a second receiving groove 12120. Specifically, the first pole post 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 that is close to the shell cover 112. The second end wall 12121 and the second side wall 12123 surround to form the second receiving groove 12120. The surface of the first pole post 12 away from the shell cover 112 is the outer end face 123 of the pole post. The groove opening of the second receiving groove 12120 is formed on the outer end face 123 of the pole post. A through hole 12130 is provided on the second end wall 12121.

[0299] The battery cell 10 also includes a cell assembly 2, a support 3 and an insulating component 4. The cell assembly 2 includes an active material coating part 21 and a conductive part 22. The active material coating part 21 is housed in the housing 11. The support 3 is disposed at one end of the active material coating part 21 and is located between the closed end of the housing 111 along the first direction Z and the active material coating part 21. The support 3 has two through holes 311, which are spaced apart along the second direction X.

[0300] The support 3 has a main body 36 and an extension 37. The extension 37 is located around the main body 36. The projection of the main body 36 on the plane of the cover 112 is inside the projection of the active material coating part 21 on the plane of the cover 112. The projection of the extension 37 on the plane of the cover 112 is outside the projection of the active material coating part 21 on the plane of the cover 112.

[0301] In the technical solution of this application embodiment, an independent bracket 3 is used instead of the plastic part embedded under the top cover in the related technology. The bracket 3 and the cell assembly 2 are put into the shell together. During the process of installing the 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, minimize the occurrence of the shell 11 scratching the active material coating part 21, improve the reliability of the battery cell 10, and the installation steps are simple and conducive to improving production efficiency.

[0302] According to some embodiments of this application, this application also provides a battery 100, including the battery cell 10 described in any of the above embodiments.

[0303] In the above technical solution, since the battery 100 is provided with the battery cell 10, 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, minimize the occurrence of the shell 11 scratching the active material coating part 21, improve the reliability of the battery 100, and the installation steps are simple and conducive to improving production efficiency.

[0304] According to some embodiments of this application, this application also provides an electrical device 1000, including the battery 100 described above, and the battery 100 is used to provide electrical energy to the electrical device 1000.

[0305] In the above technical solution, since the electrical device 1000 is equipped with the aforementioned battery 100, the operational reliability and stability of the battery 100 can be improved, thereby enhancing the operational reliability and stability of the electrical device 1000. It is understood that when the electrical device 1000 is a vehicle, the extended battery life helps to increase the vehicle's driving range.

[0306] The electrical device 1000 can be any of the aforementioned devices or systems that use the battery 100.

[0307] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0308] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell (10) characterized by, The battery monomer (10) comprises: a shell (11) comprising a shell cover (112) and a shell body (111) with an opening (1110), wherein the shell cover (112) covers the opening (1110); an electric core assembly (2) comprising an active material coating part (21) arranged in the shell (11); a support (3) arranged at one end of the active material coating part (21) away from the opening (1110) and matched with the electric core assembly (2), wherein the support (3) is clamped or bonded with the electric core assembly (2); wherein the support (3) has a main body part (36) and an extension part (37) arranged on the side of the main body part (36), the projection of the main body part (36) on the plane of the shell cover (112) is located in the projection of the active material coating part (21) on the plane of the shell cover (112), and the projection of the extension part (37) on the plane of the shell cover (112) is located outside the projection of the active material coating part (21) on the plane of the shell cover (112), the support (3) has a first liquid injection flow guide groove (392) on the side facing the active material coating part (21).

2. The battery cell (10) according to claim 1, characterized in that The extension part (37) is located on the two sides of the main body part (36) along the 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, characterized in that The extension part (37) is a ring structure surrounding the main body part (36).

4. The battery cell (10) according to claim 1, characterized in that The edge of the extension part (37) away from the surface of the shell cover (112) has a guide surface (35), and the guide surface (35) comprises an arc surface and / or an inclined surface.

5. The battery cell (10) according to claim 1, characterized in that The side of the extension part (37) close to the shell cover (112) is provided with a limiting protrusion (38), and the support (3) is clamped with the active material coating part (21) through the limiting protrusion (38).

6. The battery cell (10) according to claim 5, characterized in that The side surface of the limiting protrusion (38) facing the active material coating part (21) comprises: a first surface (381) abutting the side wall of the active material coating part (21); and / or a second surface (382) gradually increasing in distance from the active material coating part (21) in the direction of the support (3) pointing to the opening (1110).

7. The battery cell (10) according to claim 1, characterized in that The battery monomer (10) further comprises: an insulating part (4) wrapping the active material coating part (21) and connected with the extension part (37).

8. The battery cell (10) according to claim 7, characterized in that The insulating part (4) is connected with the peripheral wall surface (370) of the extension part (37).

9. The battery cell (10) according to claim 8, characterized in that 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 part (21) than the first step surface (371), and the insulating part (4) is connected to the second step surface (372).

10. The battery cell (10) according to claim 9, characterized in that The first step surface (371) is farther from the active material coating portion (21) than the outer side surface of the insulating member (4).

11. The battery cell (10) according to claim 1, characterized in that The battery cell (10) further comprises: An insulating member (4) is wrapped around the active material coating portion (21) and connected to the surface of the main body portion (36) away from the shell cover (112).

12. The battery cell (10) according to claim 1, characterized in that The shell (11) is provided with a pole (12); the electric core assembly (2) further comprises a conductive portion (22), which is connected to the side of the active material coating portion (21) close to the main body portion (36), the main body portion (36) has a through hole (311), and the conductive portion (22) passes through the through hole (311) to be connected to the pole (12).

13. The battery cell (10) according to claim 12, characterized in that The bracket (3) is of an integrated structure; or the bracket (3) is of a split structure and comprises a separately formed first bracket (33) and a second bracket (34), and the first bracket (33) and the second bracket (34) define the through hole (311) therebetween.

14. The battery cell (10) according to claim 12, characterized in that The side of the main body portion (36) away from the active material coating portion (21) is provided with an accommodation groove (393) in communication with the through hole (311), and the accommodation groove (393) is used for accommodating at least part of the pole (12).

15. The battery cell (10) of claim 12, characterized in that The side of the main body portion (36) away from the active material coating portion (21) is provided with a positioning portion (32), which is circumferentially surrounded by the through hole (311) and extends in a direction close to the pole (12).

16. The battery cell (10) according to claim 15, characterized in that The pole (12) is provided with an accommodation portion (121), and at least part of the conductive portion (22) is accommodated in the accommodation portion (121).

17. The battery cell (10) of claim 12, wherein, The side of the main body portion (36) toward the active material coating portion (21) is formed with a guide groove (312) in communication with the through hole (311), the guide groove (312) accommodates at least part of the conductive portion (22), and the cross-sectional area of the guide groove (312) gradually increases in a direction of the main body portion (36) close to the active material coating portion (21).

18. The battery cell (10) according to claim 17, characterized in that At least one first liquid injection flow channel (392) is in communication with the guide groove (312).

19. The battery cell (10) of claim 1, wherein, The bracket (3) has a second liquid injection flow channel on the side thereof away from the active material coating portion (21).

20. The battery cell (10) of claim 1, wherein, The side of the bracket (3) toward the electric core assembly (2) has a clearance portion (391) for avoiding the outer edge of the side of the electric core assembly (2) toward the bracket (3).

21. The battery cell (10) of claim 1, wherein, The electric core assembly (2) further comprises a conductive portion (22), which is connected to the side of the active material coating portion (21) close to the main body portion (36); The shell (11) is provided with a pole (12), the pole (12) is provided with an accommodation portion (121), and at least part of the conductive portion (22) is accommodated in the accommodation portion (121) and connected to the pole (12).

22. The battery cell (10) according to claim 21, characterized in that The accommodation portion (121) has a first accommodation groove (12110), a surface of the pole (12) on a side toward the active material coating portion (21) is a pole inner end face (122), a groove opening of the first accommodation groove (12110) is formed on the pole inner end face (122), and at least part of the conductive portion (22) is accommodated in the first accommodation groove (12110).

23. The battery cell (10) of claim 21, characterized in that The accommodation portion (121) has a second accommodation groove (12120), a surface of the pole (12) on a side away from the active material coating portion (21) is a pole outer end face (123), a groove opening of the second accommodation groove (12120) is formed on the pole outer end face (123), the second accommodation groove (12120) is communicated with an inside of the shell (11) through a through hole (12130), and the conductive portion (22) is provided through the through hole (12130) and at least part of the conductive portion (22) is accommodated in the second accommodation groove (12120).

24. The battery cell (10) according to any one of claims 1 to 23, characterized in that The number of the openings (1110) is two, one shell cover (112) is arranged at each of the openings (1110), and the support (3) is arranged at an end of the active material coating portion (21) away from any one of the openings (1110).

25. The battery cell (10) according to any one of claims 1 to 23, characterized in that At least one pole (12) is arranged on a shell wall of a side of the shell (11) adjacent to the support (3).

26. A battery (100) characterized by The battery (100) comprises the battery cell (10) according to any one of claims 1-25.

27. An electrically powered device (1000) characterized by The battery (100) comprises the battery cell (10) according to any one of claims 1-25.

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