Battery cells, batteries and electrical devices

Abstract

This application discloses a battery cell, a battery, and an electric device. The battery cell includes a casing, a battery core assembly, a support disposed at one end of the battery core assembly, and an insulating member fitted to the support and covering the battery core assembly. The battery core assembly, the support, and the insulating member are all disposed within the casing, and at least a portion of the insulating member is connected to a wall of the support remote from the battery core assembly. The technical solution of the embodiments of this application improves the connection reliability between the insulating member and the support, reduces the risk of the insulating member falling off, and further reduces the risk of corrosion of the casing due to exposure of the battery core assembly, thereby reducing the risk of failure of the battery core assembly itself and the risk of leakage, thereby improving the reliability and stability of the battery cell.

Description

[Technical Field]

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, with their energy-saving and environmentally friendly advantages, are an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor related to their development. In related technologies, the reliability of battery cells needs to be improved, as this hinders further improvement of battery reliability. Summary of the Invention

[0003] In view of the above problems, the present application provides a battery cell, a battery, and an electric device that are relatively reliable.

[0004] In a first aspect, the present application provides a battery cell comprising a casing, a battery core assembly, a support installed at one end of the battery core assembly, and an insulating member that fits with the support and covers the battery core assembly, wherein the battery core assembly, the support, and the insulating member are all installed within the casing, and at least a portion of the insulating member is connected to a wall surface of the support that is remote from the battery core assembly.

[0005] In the technical solution of the embodiment of the present application, at least a part of the insulating member is connected to the wall surface of the support away from the battery core assembly. On the one hand, during the process of attaching the battery core assembly with the support to the casing, the casing is not easily rubbed at the connection position between the insulating member and the support, and the connection position between the insulating member and the support is not easily separated during the attachment process. This reduces the movement and slippage of the insulating member during the process of attaching the battery core assembly to the casing, improves the reliability of the connection between the insulating member and the support, and reduces the risk of the insulating member falling off. This reduces the risk of corrosion of the casing due to exposure of the battery core assembly, reduces the risk of failure of the battery core assembly itself, and reduces the risk of leakage. It also improves the reliability and stability of the battery cells. At the same time, compared to when the insulating member is connected to the peripheral side of the battery core assembly, By fitting into the port, the insulating member is originally adjacent to multiple surfaces on the peripheral side of the casing, and is adjacent to only one surface at one end of the casing, which significantly reduces the probability of interference with the fitting position of the insulating member and the support, further improving the reliability and stability of the insulating member and improving the reliability and stability of the battery cell. Furthermore, by connecting at least a portion of the insulating member to a wall surface of the support away from the battery core assembly, the insulating member can be designed to be longer and can be applied to battery core assemblies of different sizes, resulting in higher compatibility and easier manufacturability. On the other hand, after the support and battery core assembly are installed in place in the casing, the insulating member is pressed against the wall surface opposite the casing opening, which further reduces the risk of the insulating member falling off and the risk of battery core assembly failure due to exposure. At the same time, it reduces the risk of casing corrosion and improves the reliability and stability of the battery cell.

[0006] In some embodiments, the insulating member is connected continuously or at intervals in a ring shape in the circumferential direction of the wall surface of the support away from the battery core assembly, thereby increasing the connection area between the insulating piece and the support, improving the reliability and stability of the connection between the insulating member and the support in the circumferential direction of the support, further reducing the risk of the insulating member falling off, further improving the reliability of the attachment of the battery core assembly to the casing, and ensuring the reliability and stability of the battery cells.

[0007] In some embodiments, the insulating member is hot-melt connected to the wall surface of the support away from the battery core assembly to form a connection mark, which may extend annularly in the circumferential direction of the wall surface, or there may be multiple connection marks, which are spaced apart in the circumferential direction of the wall surface. In the above technical solution, on the one hand, the hot-melt connection facilitates the fitting of the insulating member and the support, improves assembly efficiency, ensures the efficiency of mounting the battery core assembly to the casing, and saves assembly and manufacturing costs. On the other hand, whether the connection marks extend annularly in the circumferential direction or are spaced apart in the circumferential direction, both can improve the robustness of the connection between the insulating member and the support, improve the reliability and stability of the connection between the insulating member and the support, and sufficiently reduce the risk of the insulating member falling off. At the same time, by spaced apart in the circumferential direction compared to when the connection marks extend annularly in the circumferential direction, the reliability of the connection between the insulating member and the support can be ensured, thereby saving materials and reducing costs.

[0008] In some embodiments, the casing is provided with a pole, the battery core assembly includes an active material application portion and a conductive portion, the conductive portion is connected to the side of the active material application portion closest to the support and extends toward and is connected to the pole, and the insulating member and the support jointly cover the circumferential direction of the active material application portion. In the above technical solution, by having the insulating member and the support jointly cover the circumferential direction of the active material application portion, on the one hand, the active material application portion is completely separated from the casing, reducing exposure of the active material application portion, reducing the risk of failure and damage to the battery core assembly, and improving the reliability and stability of the battery cell, on the other hand, it is possible to reduce the size and cost of the insulating member, and at the same time, the support can stabilize and protect the insulating member, fully ensuring the reliability and stability of the battery cell.

[0009] In some embodiments, the insulating member includes a main insulating portion, a first insulating portion, and a second insulating portion, the main insulating portion enveloping the peripheral edge of the active material-applied portion, the first insulating portion and the second insulating portion being respectively disposed at opposite ends of the main insulating portion, the first insulating portion being located on the side of the main insulating portion away from the support and enveloping the end of the active material-applied portion away from the support, and the second insulating portion being located on the side of the main insulating portion closer to the support and mating with the support to cover, together with the support, the end of the active material-applied portion closer to the support. The insulating member is composed of multiple portions, which, together with the support, can cover the sides, bottom, and top of the active material-applied portion and completely separate the active material-applied portion from the casing, thereby substantially reducing exposure of the active material-applied portion, reducing the risk of failure and damage to the battery core assembly and the risk of corrosion to the casing, and improving the reliability and stability of the battery cell.

[0010] In some embodiments, the main insulating portion includes a plurality of main insulating portions connected end-to-end in a ring shape, the plurality of main insulating portions jointly enclosing the peripheral edge of the active material-coated portion, and the first insulating portion and the second insulating portion are located at opposite ends of the ring structure. The plurality of main insulating portions are connected to form a ring shape, completely enclosing the peripheral edge of the active material-coated portion and completely isolating the peripheral edge of the active material-coated portion from the inner wall of the casing, reducing the risk of exposure of the active material-coated portion and improving the reliability and stability of the battery cell.

[0011] In some embodiments, the connection positions of any two adjacent main body parts partially overlap. In the above technical solution, on the one hand, because the connection positions of the main body parts overlap, the connection positions will not be easily separated or cut, reducing the probability and risk of insulation failure at the overlapping portions, improving the reliability of the battery core assembly and the stability and reliability of the battery cell; on the other hand, because the connection positions of the main body parts overlap, it is fully guaranteed that the entire insulating member surrounds the circumferential direction of the active material-coated portion, fully reducing the exposure of the active material-coated portion, reducing the risk of corrosion of the casing, and further improving the reliability and stability of the battery core assembly and the battery cell.

[0012] In some embodiments, the peripheral side of the active material-coated portion has multiple surfaces, and each main body portion includes a main body surface and two flanges disposed on both sides of the main body surface, any two adjacent main body portions are connected by the flanges, and the connection structures of each main body surface and each of the two flanges respectively enclose different surfaces of the peripheral side of the active material-coated portion. In the above technical solution, on the one hand, the flange connection of any two adjacent main body portions ensures connection reliability and improves the reliability and stability of the battery core assembly and the battery cell; on the other hand, the main body surface and each of the two flange connection positions respectively enclose one surface of the peripheral side of the active material-coated portion, thereby effectively enclosing all surfaces of the peripheral side of the active material-coated portion, further improving the reliability of the battery core assembly and the stability and reliability of the battery cell.

[0013] In some embodiments, the peripheral side of the active material-applied portion has four surfaces, and the main insulating portion includes two main portions, a first main portion and a second main portion, respectively, arranged on either side of the first insulating portion, the first main portion including a first main surface and a first flange and a second flange arranged on either side of the first main surface, the second main portion including a second main surface and a third flange and a fourth flange arranged on either side of the second main surface, the first flange being connected to the third flange, and the second flange being connected to the fourth flange, and the first main surface, the connection structure between the first flange and the third flange, the second main surface, and the connection structure between the second flange and the fourth flange respectively encompass the four surfaces arranged sequentially on the peripheral side of the active material-applied portion. When the peripheral side of the active material application portion has four surfaces, the battery cell is approximately rectangular. In this case, the first main body portion, the second main body portion, and their connection structure completely cover the four peripheral surfaces of the active material application portion, completely separate the four peripheral surfaces of the active material application portion from the inner wall of the casing, reduce the risk of exposure of the active material application portion, and sufficiently improve the reliability and stability of the rectangular battery cell.

[0014] In some embodiments, the first insulating part has a centerline, and the first and second main body parts are located on either side of the centerline of the first insulating part, respectively. The first and second main body parts are symmetrically arranged around the centerline, or the first and second main body surfaces are symmetrically arranged around the centerline. When the two main body parts are perfectly symmetrical, mold opening and manufacturing of the insulating member are facilitated, costs are saved, and manufacturing efficiency is improved. When the two main body surfaces are symmetrically arranged, the flanges of the two main body parts do not need to be symmetrical. In this case, the flange of one main body part is long and the flange of the adjacent main body part is short, so that when the two main body parts are connected, the long flange can surround the short flange. This saves costs, reduces the risk of exposure of the active material coating part, reduces the risk of corrosion of the casing, and significantly improves the reliability and stability of the prismatic battery cell.

[0015] In some embodiments, the second insulating portion includes a plurality of sub-insulating portions, each of which is connected to a plurality of main portions in a one-to-one correspondence, and any two adjacent sub-insulating portions partially overlap, thereby effectively reducing the phenomenon of casing corrosion due to exposure of the active material application portion.

[0016] In some embodiments, each insulating sub-part includes a main surface and two sub-surfaces, the main surface is connected to the main surface of the corresponding main part, the two sub-surfaces are respectively connected to the two flanges of the corresponding main part, and any two adjacent flanges are provided with two corresponding sub-surfaces connected to each other, and each sub-surface is connected to the adjacent main surface. By providing the main surface and the sub-surfaces, the insulating member can easily cover the outside of the battery core assembly, ensuring manufacturing and assembly efficiency and reducing manufacturing and assembly costs.

[0017] In some embodiments, two sub-surfaces corresponding to any two adjacent flanges are partially overlapped, and / or each sub-surface is partially overlapped with the adjacent main surface. Regardless of whether the two sub-surfaces are overlapped or the sub-surfaces are overlapped with the adjacent main surface, it is possible to sufficiently ensure that the entire insulating member is tightly fitted with the support, and the entire insulating member can be fitted with the support and surround the active material application portion in the circumferential direction, sufficiently reducing the exposure of the active material application portion, reducing the risk of casing corrosion, and improving the stability and reliability of the battery cell.

[0018] In some embodiments, there is a notch at the connection position between the main insulating part and the first insulating part, and / or there is a notch at the connection position between the main insulating part and the second insulating part. In the above technical solution, on the one hand, such an arrangement makes it easy to fold the insulating member to smoothly encase the active material-coated part, which is advantageous for improving production and manufacturing efficiency and reducing production and manufacturing costs, and on the other hand, such an arrangement reduces errors in the process of the insulating member covering the active material-coated part, improving the precision and reliability of the covering of the insulating member and the support, and further improving the stability and reliability of the battery cell.

[0019] In some embodiments, the casing is provided with a pole, and the battery core assembly includes an active material application portion and a conductive portion, the conductive portion being connected to the side of the active material application portion closest to the support, and the support has a through-hole, and the conductive portion passes through the through-hole and is connected to the pole. On the one hand, by providing the through-hole in the support, the support can play a role in converging and accommodating the conductive portion, facilitating the connection between the conductive portion and the pole, and improving the reliability and convenience of assembling the battery cell. On the other hand, because the support converges the conductive portion, the structure of the original plastic member of the battery cell can be omitted, and the fitting of the support and the insulating member can achieve insulation between the entire battery core assembly and the casing, effectively reducing manufacturing and production costs.

[0020] In some embodiments, the support is a one-piece structure, or the support is a separate structure and includes a first support and a second support molded separately, with a through-hole defined between the first support and the second support. Installing the support as a one-piece structure not only reduces the number of components, eliminates intermediate connecting members, reduces costs, and improves the structural strength of the support, but also simplifies the assembly process, which is advantageous for improving manufacturing efficiency. Installing the support as a first support and a second support molded separately facilitates assembly of the support and the battery core assembly.

[0021] In some embodiments, a receiving groove communicating with the through-hole is formed on the side of the support away from the active material-coated portion, and the receiving groove receives at least a portion of the electrode post. In the above technical solution, on the one hand, receiving at least a portion of the electrode post in the receiving groove makes the overall structure of the battery cell more compact and reliable, which is favorable for improving the energy density of the entire battery. On the other hand, by providing the receiving groove, the electrode post and the casing are partially insulated by the support, which further improves the stability and reliability of the battery cell. Furthermore, receiving the electrode post in the receiving groove improves the stability and reliability of the electrode post, thereby ensuring the stability and reliability of the battery cell during charging and discharging.

[0022] In some embodiments, a guide portion is provided on the support on the side away from the active material-coated portion, and the guide portion surrounds the through hole in the circumferential direction and extends toward the electrode post. The guide portion can restrain, converge, or support the conductive portion, facilitating connection between the conductive portion and the electrode post and improving the efficiency and quality of battery cell assembly.

[0023] In some embodiments, the electrode post is provided with a receiving portion, at least a portion of the conductive portion is received in the receiving portion, and at least a portion of the guide portion extends into the receiving portion to guide the conductive portion to be received in the receiving portion. In the above technical solution, on the one hand, by installing the electrode post as a hollow structure and fitting the guide portion into the hollow structure, the conductive portion can be guided to be connected to the electrode post, improving the reliability of the connection and ensuring the efficiency and quality of assembly. On the other hand, by fitting the conductive portion into the receiving portion, the assembly efficiency of the conductive portion can be improved and the space occupied by the conductive portion can be saved. By maximizing the space utilization of the battery cell, the fit between the support and the electrode post and between the support and the conductive portion can be made tighter and more reliable, making the structure of the battery cell more compact and further favorable to improving the energy density of the battery cell.

[0024] In some embodiments, a guide groove communicating with the through hole is formed on the side of the support facing the active material application portion, and the guide groove accommodates at least a portion of the conductive portion, and the horizontal cross-sectional area of ​​the guide groove gradually increases along the direction approaching the active material application portion of the support. The guide groove not only accommodates the conductive portion, but also allows the conductive portion to retreat, preventing it from being crushed, reducing the probability of the conductive portion becoming loose or folded over, and reducing redundancy.

[0025] In some embodiments, the support has at least one first liquid injection guide groove, which is located on the side of the support facing the active material-coated portion, and which communicates with the guide groove. The first liquid injection guide groove can increase the fluidity of the electrolyte, improve the injection speed, and shorten the anodization standing time. The electrolyte flows along the first liquid injection guide groove toward the guide groove, allowing the electrolyte to flow to a predetermined position. This increases the contact area between the electrolyte and the active material-coated portion, thereby reducing the problem of insufficient penetration into the active material-coated portion.

[0026] In some embodiments, the support has a first injection guide groove located on a side of the support closer to the battery core assembly, and / or a second injection guide groove located on a side of the support farther from the battery core assembly. The first injection guide groove and the second injection guide groove can improve the fluidity of the electrolyte, increase the injection speed, and shorten the anodization standing time.

[0027] In some embodiments, the support has a recess on the side facing the battery core assembly to accommodate the outer edge of the battery core assembly facing the support, reducing the risk of the support crushing the battery core assembly.

[0028] In some embodiments, one side of the support is provided with a position limiting protrusion that engages with the battery core assembly, which can restrain one end of the battery core assembly, reduce the probability of the outer layer of the battery core assembly becoming loose, protect the one end of the battery core assembly, and reduce the problem of the one end of the battery core assembly coming into contact with the casing, thereby preventing the casing from damaging the battery core assembly during installation.

[0029] In some embodiments, the casing is provided with a pole, the battery core assembly includes an active material coated portion and a conductive portion connected to the support-side of the active material coated portion, and the pole is provided with a housing portion, and at least a portion of the conductive portion is housed in the housing portion and connected to the pole. By housing at least a portion of the conductive portion in the housing portion, the space occupied by the battery cell itself can be reduced, so that a battery of the same volume can house more battery cells and the volumetric energy density of the battery can be improved. Furthermore, by housing at least a portion of the conductive portion in the housing portion to occupy the space within the pole, the redundancy of the conductive portion in the casing can be reduced at least to some extent, reducing the probability of a short circuit between the conductive portion and the active material coated portion, reducing the probability of a short circuit of the battery cell, and improving the reliability and stability of the operation of the battery cell and the battery.

[0030] In some embodiments, the accommodating portion has a first accommodating groove, the surface of the pole facing the active material coated portion is the pole inner end face, the groove opening of the first accommodating groove is formed in the pole inner end face, and at least a portion of the conductive portion is accommodated in the first accommodating groove.

[0031] In the above technical solution, on the one hand, by forming a first accommodating groove in the pole, the weight of the pole can be reduced to a certain extent, thereby improving the weight energy density of the battery cell and the battery. On the other hand, because the groove opening of the first accommodating groove is formed on the inner end surface of the pole, which is the surface of the pole closer to the active material coated portion, the first accommodating groove can open toward the active material coated portion, and the conductive portion can easily extend into the first accommodating groove, improving assembly efficiency. In addition, a first accommodating groove of this type is easy to process, improving manufacturing efficiency.

[0032] In some embodiments, the accommodating portion has a second accommodating groove, the surface of the pole away from the active material application portion is the pole outer end face, the groove opening of the second accommodating groove is formed on the pole outer end face, the second accommodating groove communicates with the inside of the casing via a through hole, and the conductive portion is drilled in the through hole and is at least partially accommodated in the second accommodating groove. In the above technical solution, on the one hand, by providing the second accommodating groove in the pole, the weight of the pole can be reduced to a certain extent, thereby improving the weight energy density of the battery cell and the battery; on the other hand, because the groove opening of the second accommodating groove is formed on the outer end surface of the pole, which is the surface of the pole away from the active material coated portion, the second accommodating groove can be opened in a direction away from the active material coated portion. In this way, when at least a portion of the conductive portion is accommodated in the second accommodating groove, the groove opening of the second accommodating groove can be easily achieved to accommodate and organize the conductive portion, and the groove opening of the second accommodating groove can be easily achieved to electrically connect the conductive portion and the pole, which further reduces the difficulty of manufacturing the battery cell and improves the manufacturing efficiency of the battery cell.

[0033] In some embodiments, the casing includes a casing body having an opening and a casing cover covering the opening, where the number of openings is one and the support is located at one end of the battery core assembly away from the opening, or the number of openings is two, each opening is covered with a casing cover, and the support is located at one end of the battery core assembly away from any opening. A part of the insulating member may be pressed between a wall facing one of the openings of the casing body and the corresponding support, and another part of the insulating member may be pressed between a wall facing the other opening of the casing body and the corresponding support, further reducing the risk of the insulating member falling off and reducing the risk of battery core assembly failure due to exposure, while simultaneously reducing the risk of casing corrosion and improving the reliability and stability of the battery cells.

[0034] In the above technical solution, an opening is provided in the casing body, and a support is provided at one end of the battery core assembly away from the opening. The battery core assembly including the support and the insulating member can be installed into the casing body only through this opening. Since there is only one installation direction, this is advantageous for improving installation efficiency. The casing does not rub against the edge of the insulating member, and does not rub against the connection position between the insulating member and the support. This improves the reliability of the connection between the insulating member and the support and reduces the risk of the insulating member falling off, thereby reducing the risk of corrosion of the casing due to exposure of the battery core assembly, reducing the risk of failure of the battery core assembly itself, and reducing the risk of liquid leakage, thereby improving the reliability and stability of the battery cell. The casing body has two openings, and a support is installed at one end of the battery core assembly away from any of the openings. The battery core assembly including the two supports and the insulating member can be attached to the casing body through any of the openings, and an appropriate attachment direction can be selected according to needs. After the battery core assembly is attached to a predetermined position in the casing body, one part of the insulating member can be pressed between the wall facing one of the openings of the casing body and the corresponding support, and the other part of the insulating member can be pressed between the wall facing the other opening of the casing body and the corresponding support, which further reduces the risk of the insulating member falling off and the risk of the battery core assembly failing due to exposure, while also reducing the risk of casing corrosion and improving the reliability and stability of the battery cells.

[0035] In some embodiments, at least one pole is installed on the casing wall adjacent to the support. In the above technical solution, the battery core assembly including the support and the insulating member enters the casing body through the opening, and the conductive part directly faces the pole, so that the conductive part can be connected to the pole relatively easily, improving the assembly efficiency of the battery cell.

[0036] In a second aspect, the present application provides a battery comprising the battery cell of the above embodiment.

[0037] In the above technical solution, the battery cells are installed in the battery, and at least a portion of the insulating member is connected to the wall surface of the support away from the battery core assembly, which can improve the reliability of the connection between the insulating member and the support, reduce the risk of the insulating member falling off, and further reduce the risk of corrosion of the casing due to exposure of the battery core assembly, reduce the risk of failure of the battery core assembly itself, and reduce the risk of leakage, thereby improving the reliability and stability of the battery.

[0038] In a third aspect, the present application provides an electrical device comprising a battery according to any of the above embodiments.

[0039] In the above technical solution, the battery is installed in an electrical device, which can improve the reliability and stability of the battery's operation, and thus improve the reliability and stability of the battery device's operation.

[0040] The above description is merely a summary of the technical solution of the present application. In order to more clearly understand the technical means of the present application and to implement the present application in accordance with the contents of the specification, and to more clearly and easily understand the above and other objects, features and advantages of the present application, specific embodiments of the present application are specifically listed below.

[0041] In order to more clearly explain the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings used in the embodiments. However, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope. Those skilled in the art can obtain other related drawings based on these drawings without any creative work. [Brief explanation of the drawings]

[0042] [Figure 1] 1 is a structural schematic diagram of a vehicle provided in accordance with some embodiments of the present application. [Figure 2] 1 is an exploded view of a battery structure provided in accordance with some embodiments of the present application. [Figure 3]1 is a battery provided in accordance with some embodiments of the present application. [Figure 4] 1 is a structural cross-sectional view of a battery cell according to some embodiments of the present application. [Figure 5] 1 is a structural cross-sectional view of a battery cell according to some embodiments of the present application after assembling a battery core assembly, a support, and an insulating member. [Figure 6] FIG. 1 is an assembly diagram of a battery cell according to some embodiments of the present application. [Figure 7] 10A and 10B are assembly diagrams of battery cells according to some other embodiments of the present application. [Figure 8] FIG. 1 is a top view of a battery cell according to some embodiments of the present application. [Figure 9] FIG. 10 is a top view of a battery cell according to some other embodiments of the present application. [Figure 10] FIG. 10 is a top view of a battery cell according to some further embodiments of the present application. [Figure 11] 1 is a structural schematic diagram of an insulating member of a battery cell in an unfolded state according to some embodiments of the present application. [Figure 12] 10A and 10B are structural schematic diagrams of insulating members of battery cells in an unfolded state according to some other embodiments of the present application. [Figure 13] 10A and 10B are structural schematic diagrams of insulating members of battery cells in an unfolded state according to further some embodiments of the present application. [Figure 14] 10A and 10B are structural schematic diagrams of insulating members of battery cells in an unfolded state according to further some embodiments of the present application. [Figure 15] 1 is a structural schematic diagram of an insulating member of a battery cell in a coated state according to some embodiments of the present application; [Figure 16] FIG. 16 is a structural cross-sectional view of the battery cell shown in FIG. [Figure 17] 1 is a structural schematic diagram of an insulating member of a battery cell before wrapping a battery core assembly according to some embodiments of the present application. FIG. [Figure 18] 1 is a structural schematic diagram of a support for a battery cell according to some embodiments of the present application; [Figure 19] 10A and 10B are structural schematic diagrams of supports for battery cells according to some other embodiments of the present application. [Figure 20] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 21] 1 is a structural cross-sectional view of a support for a battery cell according to some embodiments of the present application. [Figure 22] FIG. 1 is a top view of a support for a battery cell according to some embodiments of the present application. [Figure 23] 10A and 10B are top views of support for battery cells according to some other embodiments of the present application. [Figure 24] FIG. 1 is a front view of a battery cell according to some embodiments of the present application. [Figure 25] FIG. 10 is a front view of a battery cell according to some other embodiments of the present application. [Figure 26] 1 is a cross-sectional view of a local structure of a battery cell according to some embodiments of the present application; [Figure 27] 10A to 10C are cross-sectional views of local structures of battery cells according to some other embodiments of the present application. [Figure 28] 10A-10C are cross-sectional views of local structures of battery cells according to further some embodiments of the present application. [Figure 29] 10A-10C are cross-sectional views of local structures of battery cells according to still further embodiments of the present application. [Figure 30] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 31] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 32] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 33] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 34] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 35] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 36] FIG. 36 is an exploded view of the structure of the battery cell shown in FIG. 35. [Figure 37]FIG. 37 is an exploded view of the first cover plate shown in FIG. 36. [Figure 38] 1 is a schematic cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 39] FIG. 39 is an exploded view of the structure of the battery cell shown in FIG. 38. DETAILED DESCRIPTION OF THE INVENTION

[0043] [Explanation of symbols] Electric device 1000, battery 100, controller 200, motor 300, First direction Z, second direction X, third direction Y, axial direction R of the pole, Battery cell 10, case 20, first case 201, second case 202, Casing 11, casing body 111, opening 1110, mounting wall 1112, casing cover 112, first casing cover 1121, second casing cover 1122, mounting hole 113, pole post 12, accommodation portion 121, first accommodation groove 12110, first end wall 12111, first sunken groove 12112, first side wall 12113, second accommodation groove 12120, second end wall 12121, second sunken groove 12122, second side wall 12123, first groove step 12124, second groove step 12125, guide slope 12126, stepped surface 12127, through hole 12130, pole post inner end surface 122, pole post outer end surface 123, first recessed groove 126, spacing portion 127, a first cover plate 13, a first conductive member 131, a second recessed groove 1311, a second conductive member 132, a stress relief groove 133, a second cover plate 14, Battery core assembly 2, first end 201, second end 202, active material coated portion 21, conductive portion 22, Support 3, through hole 311, guide groove 312, guide portion 32, first support 33, second support 34, position limiting protrusion 38, first surface 381, second surface 382, ​​relief portion 391, first liquid injection guide groove 392, accommodation groove 393, Insulating member 4, connection mark 401, first boundary line 401a, second boundary line 401b, third boundary line 401c, main insulating portion 41, main body portion 410, first main body portion 411, first main body surface 4111, first flange 4112, second flange 4113, second main body portion 412, second main body surface 4121, third flange 4122, fourth flange 4123, first insulating portion 42, center line 42a, second insulating portion 43, sub-insulating portion 430, main surface 431, sub-surface 432, notch 44, Groove cover 7.

[0044] The following detailed description will be given of the embodiments of the technical solution of the present application in conjunction with the accompanying drawings. The following embodiments are merely for the purpose of more clearly illustrating the technical solution of the present application, and are therefore merely examples, and do not limit the scope of the claims of the present application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. The terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the present application. The terms "comprises" and "includes" and any variations thereof in the specification, claims, and description of the drawings of this application are intended to cover a non-exclusive inclusion.

[0046] In the description of the embodiments of the present application, technical terms such as "first", "second", etc. are merely used to distinguish different objects, but should not be understood as indicating or implying relative importance, or the quantity, specific order, and priority relationship of the indicated technical features. In the description of the embodiments of the present application, "plurality" means two or more, unless otherwise clearly and specifically limited.

[0047] The term "embodiment" as used herein means that the specific feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will understand, both explicitly and implicitly, that the embodiments described herein can be combined with other embodiments.

[0048] In the description of the embodiments of the present application, the term "and / or" is simply a relation that describes related objects and indicates that three types of relations can exist. For example, A and / or B can represent three cases: the presence of only A, the simultaneous presence of A and B, and the presence of only B. In addition, the character " / " in this specification generally indicates that the related objects before and after it are in an "or" relationship.

[0049] In the embodiments of the present application, the same drawing symbols represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments will be omitted. It should be understood that the dimensions such as thickness, length, and width of various components in the embodiments of the present application shown in the drawings, and the overall dimensions such as thickness, length, and width of the integrated device, are merely illustrative and do not constitute any limitations on the present application.

[0050] The term "plurality" as used herein refers to two or more (including two).

[0051] In describing the embodiments of the present application, unless otherwise clearly specified or limited, technical terms such as "attached," "coupled," "connected," and "fixed" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or integration, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, internal communication between two elements, or an interactive relationship between two elements. Those skilled in the art will be able to understand the specific meanings of the above terms in the embodiments of the present application according to specific circumstances.

[0052] In this application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc., but the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, rectangular, or have other shapes, etc., but the embodiments of this application are not limited thereto. Battery cells are generally classified into three types depending on the encapsulation method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, but the embodiments of this application are not limited thereto.

[0053] The battery referred to in the embodiments of this application refers to a single physical module containing one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may be a battery module or a battery pack. A battery module generally includes multiple battery cells. A battery pack generally includes a case and one or more battery cells installed in the case, or a battery pack includes a case and one or more battery modules installed in the case, and the case can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0054] For example, a battery cell may typically include a casing for accommodating an electrode assembly and an electrolyte, the electrode assembly, and the electrolyte. The casing is provided with at least one positive electrode post and at least one negative electrode post. The electrode assembly is formed by stacking or winding a positive electrode piece, a negative electrode piece, and a separator film. The positive electrode piece generally includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is directly or indirectly applied to the positive electrode current collector. The positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer. The positive electrode current collector not coated with the positive electrode active material layer is used as a positive electrode tab sheet. Multiple positive electrode tab sheets are stacked and electrically connected to the positive electrode post. The negative electrode piece generally includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer being directly or indirectly coated on the negative electrode current collector, the negative electrode current collector not coated with the negative electrode active material layer protruding from the negative electrode current collector coated with the negative electrode active material layer, and the positive electrode current collector not coated with the negative electrode active material layer serving as a negative electrode tab sheet, with multiple negative electrode tab sheets stacked together and electrically connected to the negative electrode post. The material of the separator film is not particularly limited and may be, for example, polypropylene or polyethylene.

[0055] At the same time, battery cells primarily rely on the movement of metal ions between the positive and negative electrodes to function. Taking lithium-ion batteries as an example, the positive electrode current collector can be made of aluminum, the positive electrode active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc., the negative electrode current collector can be made of copper, and the negative electrode active material layer can be made of carbon or silicon. During charging and discharging, Li+ ions are repeatedly inserted and extracted between the two electrodes. During charging, Li+ ions are extracted from the positive electrode and inserted into the negative electrode through the electrolyte, leaving the negative electrode in a lithium-rich state, and vice versa during discharging.

[0056] Judging from the current market development, the application of power batteries will become more and more widespread. Power batteries are not only applied to energy storage power systems such as hydroelectric power generation, thermal power generation, wind power generation and solar power generation, but also widely used in electric transportation such as electric bicycles, electric motorcycles and electric cars, as well as in multiple fields such as military equipment and aerospace. As the application fields of power batteries continue to expand, their market demand will also continue to increase.

[0057] In the related art, a battery cell generally comprises a casing with an opening, a top cover, a battery core assembly, an insulating member, and a plastic member, the battery core assembly being installed in the casing, the top cover being provided with poles, the battery core assembly being electrically connected to the poles, and the plastic member being provided on the side of the top cover close to the poles to provide insulation, and the insulating member covering the bottom of the battery core assembly that is separated from the top cover and the peripheral side of the battery core assembly and connected to the plastic member to ensure insulation between the battery core assembly and the casing and to ensure normal progress of the battery charging and discharging process.

[0058] However, the inventor discovered that in the process of attaching the battery core assembly of the above structure to the casing, the insulating member is prone to wrinkles or curling up due to friction with the casing, and may even be peeled off from the plastic member, exposing the battery core assembly. As a result, the battery core assembly comes into contact with the inner wall surface of the casing, causing corrosion of the casing and affecting the reliability of the battery cell.

[0059] In view of this, to solve the above problems, the present application provides a battery cell, in which a support is installed at one end of a battery core assembly, an insulating member is fitted to the support and jointly covers the battery core assembly, and at least a part of the insulating member is connected to a wall surface of the support away from the battery core assembly, thereby reducing the pulling of the casing at the connection position between the insulating member and the support during the installation process, thereby reducing the movement and slippage of the insulating member during the installation process of the battery core assembly to the casing, improving the reliability of the connection between the insulating member and the support, reducing the risk of the insulating member falling off, and further reducing the risk of corrosion of the casing due to exposure of the battery core assembly, reducing the risk of failure of the battery core assembly itself, reducing the risk of leakage, and further improving the reliability and stability of the battery cell.

[0060] The battery cells disclosed in the embodiments of the present application can be used in various energy storage systems that use batteries as a power source or as an energy storage element. Examples of such electric devices include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric scooters, electric vehicles, boats, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric toy cars, electric toy boats, and electric toy airplanes. Spacecraft can include airplanes, rockets, space shuttles, and spaceships.

[0061] Taking a vehicle as an example of an electric device according to an embodiment of the present invention, the structures of the battery cell, battery, and electric device provided by the embodiment of the present invention will be described in detail.

[0062] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of an electric device 1000, which is a vehicle provided by some embodiments of the present application. The vehicle may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range-extended vehicle, etc. A battery 100 is installed in the vehicle, and the battery 100 may be installed at the bottom, head, or tail of the vehicle. The battery 100 is used to supply power to the vehicle. For example, the battery 100 may function as an operating power source for the vehicle. The vehicle may further include a controller 200 and a motor 300. The controller 200 controls the battery 100 to supply power to the motor 300, for example, to meet the operating power needs during starting, navigation, and driving of the vehicle. In some embodiments of the present application, the battery 100 can be used not only as an operating power source for the vehicle but also as a driving power source for the vehicle, and can provide driving power to the vehicle in place of or partially replacing fuel or natural gas.

[0063] Referring to FIG. 2, FIG. 2 is an exploded view of a structure in which battery cells 10 provided according to some embodiments of the present application are used in a battery 100. The battery 100 includes a case 20 and a plurality of battery cells 10 housed in the case 20. Here, the case 20 is used to provide a housing space for the battery cells 10, and the case 20 can adopt various structures. In some embodiments, the case 20 can include a first case 201 and a second case 202, which are covered with each other and jointly define a housing space for housing the battery cells 10. The second case 202 may be a hollow structure with one end open, and the first case 201 may be a plate-like structure, with the first case 201 covering the open side of the second case 202 so that the first case 201 and the second case 202 jointly define an assembly space, or both the first case 201 and the second case 202 may be hollow structures with one end open (for example, as shown in FIG. 2), with the open side of the first case 201 covering the open side of the second case 202. Of course, the case 20 formed by the first case 201 and the second case 202 may have various shapes, such as a cylindrical shape or a rectangular parallelepiped shape.

[0064] In the battery 100, the multiple battery cells 10 can be connected in series, parallel, or series-parallel, with the series-parallel connection referring to the multiple battery cells 10 being connected in both series and parallel. The multiple battery cells 10 can be directly connected in series, parallel, or series-parallel, and the entire battery cell set can be housed in a case 20. Alternatively, the battery 100 can be formed by first connecting the multiple battery cells 10 in series, parallel, or series-parallel to form a battery module, and then connecting the multiple battery modules in series, parallel, or series-parallel to form the entire battery set and housed in a case 20. The battery 100 may further include other structures; for example, the battery 100 may further include bus members for realizing electrical connection between the multiple battery cells 10.

[0065] 3, which is a schematic diagram of a battery cell 10 provided according to some embodiments of the present application. In the embodiment of the present application, the battery cell 10 is a rectangular parallelepiped, and the height direction of the battery cell 10 is a first direction Z, the length direction of the battery cell 10 is a second direction X, and the thickness direction of the battery cell 10 is a third direction Y. The first direction Z, the second direction X, and the third direction Y are perpendicular to each other two by two. Of course, in other embodiments of the present application, the battery cell 10 may be a cylindrical body, a flat body, or another shape, and is not limited to this embodiment.

[0066] 4 and 5, Fig. 4 is a structural cross-sectional view of a battery cell 10 according to some embodiments of the present application. Fig. 5 is a structural cross-sectional view of the battery cell 10 according to some embodiments of the present application after assembling a battery core assembly 2, a support 3, and an insulating member 4. In the embodiment of the present application, the battery cell 10 includes a casing 11, a battery core assembly 2, a support 3, and an insulating member 4.

[0067] The shape of the casing 11 can be adjusted according to the type of battery cell 10, and the type of battery cell 10 in the embodiments of the present application is not particularly limited. For example, if the battery cell 10 is a prismatic battery, the casing 11 will be prismatic, and if the battery cell 10 is a cylindrical battery, the casing 11 will be cylindrical. In the embodiments of the present application, the casing 11 will be prismatic. At the same time, the casing 11 is provided with electrode posts 12, which are electrically connected to the battery core assembly 2 to ensure normal charging and discharging of the battery cell 10. Generally, there are at least two electrode posts, specifically, at least one positive electrode post and at least one negative electrode post. For example, if there are two electrode posts, one is a positive electrode post and the other is a negative electrode post, which are electrically connected to the positive and negative output positions of the battery core assembly 2, respectively. Furthermore, when there are four poles, two may be positive poles and the remaining two may be negative poles, with the two positive poles both electrically connected to the positive output positions of the battery core assembly 2 and the two negative poles both electrically connected to the negative output positions of the battery core assembly 2. The casing 11 may further be provided with a pressure release mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold value, and the pressure release mechanism can release the pressure when the internal pressure or temperature of the battery cell 10 is too high to prevent the propagation of thermal runaway to other battery cells 10.

[0068] In the embodiment of the present application, the casing 11 specifically includes a casing body 111 and a casing cover 112 .

[0069] The casing body 111 has a semi-closed structure with an opening 1110 at one end, or a ring structure with openings 1110 at both ends. The casing body 111 may have various shapes and dimensions, such as a rectangular parallelepiped, a cylindrical shape, or a hexagonal prism, and the shape of the casing body 111 may be determined according to the specific shape and dimensions of the battery core assembly 2. The casing body 111 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic, and is not particularly limited in the embodiments of the present application. The casing body 111 has an opening 1110, and the opening 1110 may be one or more.

[0070] The casing cover 112 refers to a component that covers the openings 1110 of the casing body 111 to isolate the internal environment of the battery cell 10 from the external environment. The number of casing covers 112 corresponds to the number of openings 1110. When there is one opening 1110, the casing cover 112 is also one and covers and seals the opening 1110. When there are two openings 1110, the casing cover 112 is also two and covers and seals the two openings 1110, respectively. The casing cover 112 and the casing body 111 can form a common connection surface before other components are attached to the casing. When the interior of the casing body 111 needs to be sealed, the casing cover 112 covers the casing body 111. At the same time, the shape of the casing cover 112 can be adapted to the shape of the casing body 111 to fit into the casing body 111. Alternatively, the casing cover 112 may be made of a material (such as an aluminum alloy) having a certain hardness and strength, so that the casing cover 112 is less likely to deform when subjected to pressure or impact, and the battery cell 10 can have higher structural strength and improved safety performance. Functional components such as the poles 12 may be installed on the casing cover 112. The casing cover 112 may be made of various materials such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and is not particularly limited in the embodiments of the present application.

[0071] The casing 11 is provided with electrode posts 12, and there may be a plurality of electrode posts 12. The plurality of electrode posts 12 may all be mounted on the casing body 111, or all may be mounted on the casing cover 112, or some may be mounted on the casing body 111 and other parts may be mounted on the casing bar 112. In the following embodiments of the present application, an example will be described in which the casing body 111 is rectangular, the casing body 111 has one opening 1110, and there are two electrode posts 12, one anode and one cathode, and both electrode posts 12 are mounted on a wall facing the opening 1110 of the casing body 111. Of course, in other embodiments of the present application, the shape of the casing body 111, the number of openings 1110 and casing covers 112, the number of electrode posts 12, and the positions of the electrode posts 12 can all be adjusted according to needs and are not limited to the embodiments of the present application.

[0072] In the present embodiment, reference is made to FIGS. 4 and 5, and further to FIG. 6, which is an assembly diagram of a battery cell 10 according to some embodiments of the present application. In the present embodiment, the support 3 is provided at one end of the battery core assembly 2. When assembling the battery cell 10, the support 3 can be first installed at one end of the battery core assembly 2, and then the battery core assembly 2 with the support 3 can be attached to the casing 11, so that the support 3 first enters the casing body 111 through the opening 1110 of the casing body 111, and then the battery core assembly 2 enters the casing body 111. After the battery core assembly 2 is attached in place within the casing body 111, the support 3 can be located on the wall of the casing body 111 facing the opening 1110 and on the end of the battery core assembly 2 away from the opening 1110.

[0073] Referring again to FIG. 6 , when the casing body 111 has only one opening 1110, the support 3 is specifically located at one end of the battery core assembly 2 away from the opening 1110. The opening 1110 can be located on the top wall, bottom wall, or side wall of the casing body 111. When the opening 1110 is located on the bottom wall of the casing body 111, the remaining walls are all sealed, and the battery core assembly 2 including the support 3 and the insulating member 4 can be installed into the casing body 111 only through the opening 1110. After the battery core assembly 2 is installed in place in the casing body 111, the casing cover 112 covers the opening 1110 to seal it, and the insulating member 4 is pressed between the top wall of the casing body 111 and the support 3, thereby reducing the risk of the insulating member 4 falling off and the risk of the battery core assembly 2 being damaged due to exposure. At the same time, the risk of corrosion of the casing 11 is reduced, and the reliability and stability of the battery cells 10 can be improved.

[0074] In the above technical solution, an opening 1110 is provided in the casing body 111, and the support 3 is provided at one end of the battery core assembly 2 away from the opening 1110. The battery core assembly 2 including the support 3 and the insulating member 4 can be installed in the casing body 111 only through the opening 1110. Since there is only one installation direction, this is advantageous for improving installation efficiency. The casing 11 does not rub against the edge of the insulating member 4, nor does it rub against the connection position between the insulating member 4 and the support 3. This improves the reliability of the connection between the insulating member 4 and the support 3, reduces the risk of the insulating member 4 falling off, and further reduces the risk of corrosion of the casing 11 due to exposure of the battery core assembly 2. This reduces the risk of failure of the battery core assembly 2 itself and the risk of leakage, and further improves the reliability and stability of the battery cell 10.

[0075] 6 , in this embodiment, assuming that one opening 1110 is provided in the casing body 111, all of the electrode posts 12 can be provided on the end wall of the casing body 111 facing the opening 1110, so that the conductive parts 22 can pass through the support 3 and be electrically connected to the corresponding electrode posts 12 on the end wall of the casing body 111. In another embodiment, all of the electrode posts 12 can be provided on the casing cover 112, i.e., all of the electrode posts 12 are located on the side of the battery core assembly 2 away from the support 3, and the conductive parts 22 can be electrically connected to the corresponding electrode posts 12 on the casing cover 112. Alternatively, in another embodiment of the present application, one pole 12 may be provided on the casing cover 112, and the other pole 12 may be provided on the end wall of the casing body 111 opposite the opening 1110, in which case one conductive portion 22 may be electrically connected from the pole 12 on the casing cover 112.

[0076] 6 , in the present embodiment, assuming that one opening 1110 is provided in the casing body 111, the end wall of the casing body 111 facing the opening 1110 is defined as the mounting wall 1112, and all of the electrode posts 12 are mounted on the mounting wall 1112. By providing this structure, when assembling the battery cell 10, the battery core assembly 2 can enter the casing body 111 along the opening 1110, and the conductive parts 22 directly face the electrode posts 12, which allows the conductive parts 22 to be easily connected to the electrode posts 12, thereby significantly improving the assembly efficiency of the battery cell 10.

[0077] In this embodiment, the mounting wall 1112 is specifically the top wall of the casing body 111 (i.e., the end closest to the battery's bus members), and the bottom wall of the casing body 111 (i.e., the end farther from the battery's bus members) has an opening 1110. With this arrangement, the casing cover 112 is attached to the bottom of the casing body 111, and the battery core assembly 2 can be attached to the casing body 111 from bottom to top along direction Z, allowing the conductive parts 22 to be easily connected to the terminal posts 12. Meanwhile, the pulling force of the casing body 111 due to the bus members is less likely to be concentrated at the mating position between the casing body 111 and the casing cover 112, making it less likely for the mating position to crack. This effectively improves the reliability and stability of the battery cell 10.

[0078] 7, which is an assembly diagram of a battery cell 10 according to some other embodiments of the present application. In other embodiments of the present application, the number of openings 1110 on the casing body 111 may be two, and each opening 1110 is covered with a casing cover 112. In this structure, the support 3 is specifically located at one end of the battery core assembly 2, away from any openings 1110.

[0079] By installing them in this manner, when assembling the battery cell 10, the battery core assembly 2 including the supports 3 and insulating members 4 can be attached to the casing body 111 through any of the openings 1110. After the battery core assembly 2 is attached to a predetermined position in the casing body 111, the two casing covers 112 cover the two openings 1110, respectively, to seal the corresponding openings 1110. After the battery core assembly 2 including the two supports 3 is attached to the casing, one conductive portion 22 passes through one support 3 and is electrically connected to the corresponding electrode post 12 on the casing cover 112, and the other conductive portion 22 passes through the other support 3 and is electrically connected to the corresponding electrode post 12 on the casing cover 112.

[0080] 7 again, when the number of openings 1110 on the casing body 111 is two, the two openings 1110 may be located on the top wall, bottom wall, or side wall of the casing body 111, and the two openings 1110 may also be located on two opposite walls of the casing body 111. As shown in FIG. 7, the two openings 1110 may specifically be located on the top wall and bottom wall of the casing body 111, respectively. In other embodiments, the two openings 1110 may also be located on two opposite side walls of the casing body 111, respectively, or on two adjacent walls of the casing body 111, and the description thereof will be omitted here.

[0081] For illustrative purposes, when two openings 1110 are respectively installed in two opposing walls of the casing body 111, the remaining walls are all sealed, and one of the openings 1110 is covered by a first casing cover 1121, and the other opening 1110 is covered by a second casing cover 1122. In this case, all of the electrode posts 12 may be installed in the first casing cover 1121, or all of the electrode posts 12 may be installed in the second casing cover 1122, or some of the electrode posts 12 may be installed in the first casing cover 1121 or the second casing cover 1122, and the other part of the electrode posts 12 may be installed in the casing body 111.

[0082] For example, referring again to FIG. 7, if the number of openings 1110 is two, the two openings 1110 may be a first opening and a second opening respectively arranged opposite each other, and the first casing cover 1121 and the second casing cover 1122 each have one pole 12, and each end of the battery core assembly 2 has one support 3. When assembling the battery cell 10, in the process of attaching the battery core assembly 2 with the support 3 to the casing 11, first, the support 3 enters the casing body 111 from the first opening and moves toward the second opening, and then the battery core assembly 2 enters the casing body 111. After the battery core assembly 2 is attached in place in the casing body 111, the support 3 only needs to be located in the second opening.

[0083] In the above technical solution, two openings 1110 are provided in the casing body 111, and a support 3 is provided at one end of the battery core assembly 2 away from any of the openings 1110. The battery core assembly 2, including the two supports 3 and the insulating member 4, can be attached to the casing body 111 through any of the openings 1110, and an appropriate attachment direction can be selected according to needs. During the attachment process, the support 3 may be advantageous in guiding the battery core assembly 2 into the casing to ensure assembly efficiency. After the battery core assembly 2 is attached in place in the casing body 111, part of the insulating member 4 may be pressed between the wall of the casing body 111 facing one of the openings 1110 and the corresponding support 3, and the other part of the insulating member 4 may be pressed between the wall of the casing body 111 facing the other opening 1110 and the corresponding support 3, which further reduces the risk of the insulating member 4 falling off and the risk of the battery core assembly 2 being damaged due to exposure. At the same time, this reduces the risk of corrosion of the casing 11 and improves the reliability and stability of the battery cells 10.

[0084] At the same time, at least one pole 12 is installed on the casing wall of the casing 11 on the side adjacent to the support 3. The battery core assembly 2 including the support 3 and insulating member 4 enters the casing body 111 along the opening 1110, and the conductive portion 22 directly faces the pole 12, so the conductive portion 22 can be easily connected to the pole 12, improving the assembly efficiency of the battery cell 10.

[0085] 5 , in this embodiment, the insulating member 4 is fitted with the support 3, and the two members jointly cover the battery core assembly 2. Because the support 3 is installed at one end of the battery core assembly 2, the insulating member 4 can cover the battery core assembly 2 from several remaining sides of the battery core assembly 2, thereby insulating the entire battery core assembly 2 from the casing 11 in its circumferential direction. That is, the insulating member 4 improves the insulation reliability between the battery core assembly 2 and the casing 11, reduces or prevents corrosion of the casing 11 due to contact between the battery core assembly 2 and the casing 11, reduces the problem of electrolyte leakage due to corrosion of the casing 11, and improves the reliability of the battery cell 10.

[0086] 8 is a top view of a battery cell according to some embodiments of the present application. FIG. 9 is a top view of a battery cell according to other some embodiments of the present application. FIG. 10 is a top view of a battery cell according to further some embodiments of the present application. Referring to FIGS. 8 to 10, in the embodiment of the present application, the insulating member 4 is fitted with the support 3, and at least a portion of the insulating member 4 may be connected to a wall surface of the support 3 away from the battery core assembly 2. Referring again to FIG. 6, for ease of explanation, the battery core assembly 2 may be defined as having a first end 201 and a second end 202 disposed opposite each other, the support 3 may be provided at the first end 201 of the battery core assembly 2, and the insulating member 4 may be connected to a wall surface of the first end 201 of the support 3 remote from the battery core assembly 2, such that the connection position between the insulating member 4 and the support 3 is located at the wall surface of the first end 201 of the support 3 remote from the battery core assembly 2, and the edge of the first end 201 of the insulating member 4 close to the battery core assembly 2 is located at the wall surface of the first end 201 of the support 3 remote from the battery core assembly 2.

[0087] In the technical solution of the embodiment of the present application, at least a part of the insulating member 4 is connected to the wall surface of the support 3 away from the battery core assembly 2. On the one hand, during the process of attaching the battery core assembly 2 with the support 3 to the casing 11, the casing 11 is not easily rubbed at the connection position between the insulating member 4 and the support 3, and the connection position between the insulating member 4 and the support 3 is not easily separated during the attachment process. This can reduce the movement and slippage of the insulating member 4 during the process of attaching the battery core assembly 2 to the casing, improve the reliability of the connection between the insulating member 4 and the support 3, and reduce the risk of the insulating member 4 falling off. This can reduce the risk of corrosion of the casing 11 due to exposure of the battery core assembly, the risk of failure of the battery core assembly 2 itself, and the risk of leakage. At the same time, compared to connecting the insulating member 4 to the peripheral side of the battery core assembly 2, by fitting the insulating member 4 to the support 3, the insulating member 4 is originally adjacent to four sides of the peripheral side of the casing 11, and adjacent to one side of one end of the casing 11, so the probability of interference with the fitting position of the insulating member 4 and the support 3 is greatly reduced, further improving the reliability and stability of the insulating member 4 and improving the reliability and stability of the battery cell 10. In addition, by connecting at least a part of the insulating member 4 to the wall surface of the support away from the battery core assembly 2, the insulating member 4 can be designed to be longer and can be applied to battery core assemblies 2 of different sizes, resulting in higher compatibility and improved manufacturability. On the other hand, after the support 3 and the battery core assembly 2 are installed in position within the casing 11, the insulating member 4 is pressed between the wall surface facing the opening 1110 of the casing main body 11 and the support 3, thereby further reducing the risk of the insulating member 4 falling off and reducing the risk of the battery core assembly 2 failing due to exposure, while at the same time reducing the risk of corrosion of the casing 11 and improving the reliability and stability of the battery cell 10.

[0088] In addition, because each of the poles 12 is positioned opposite the opening 1110 of the casing body 111, and the mating position between the insulating member 4 and the support 3 is located on the side of the support 3 that is away from the battery core assembly 2, as the battery core assembly 2 is attached to the casing, the portion of the insulating member 4 that is located circumferentially around the battery core assembly 2 comes into contact with the casing body 111, and the casing body 111 gradually smoothes the insulating member 4, making it less likely for the insulating member 4 to accumulate or pleat. This makes the insulation effect between the battery core assembly 2 and the casing 11 more stable, further improving the reliability and stability of the battery cells 10.

[0089] 8 to 10 again, in the embodiment of the present application, the insulating member 4 is connected to the wall surface of the support 3 away from the battery core assembly 2 at intervals in the circumferential direction, that is, there are multiple connection positions between the insulating member 4 and the support 3, and the multiple connection positions are arranged at intervals in the circumferential direction of the support 3. By ensuring the reliability and stability of the connection between the insulating member 4 and the support 3 in the circumferential direction of the support 3, it is possible to save on connection materials, reduce material costs, simplify connection steps, and improve manufacturing efficiency.

[0090] Of course, in other embodiments of the present application, the wall surfaces of the insulating member 4 and the support 3 that are remote from the battery core assembly 2 may be continuously connected in a circumferentially circular manner. The "circular connection" here means that the connection between the insulating member 4 and the support 3 extends along the circumferential direction of the support 3 to form a closed loop. This arrangement increases the connection area between the insulating member 4 and the support 3, improving the reliability and stability of the connection between the insulating member 4 and the support 3 in the circumferential direction of the support 3, further reducing the risk of the insulating member 4 falling off, further improving the reliability of the attachment of the battery core assembly 2 to the casing, and ensuring the reliability and stability of the battery cells 10.

[0091] In addition, in other embodiments of the present application, the connection positions between the insulating member 4 and the support 3 may be installed on opposite sides of the support 3, adjacent sides, or concentrated on multiple sides, and may be specifically selected according to the actual shapes of the battery core assembly 2 and the support 3, and are not limited here.

[0092] Referring again to Figures 8 to 10, in the embodiments of the present application, the connection method between the insulating member 4 and the support 3 may be a hot melt connection, and the insulating member 4 is hot melt connected to the wall surface of the support 3 away from the battery core assembly 2 to form a connection mark 401, the position of the connection mark 401 is not limited by space, and compared with the related art, the area of ​​the connection mark 401 may be designed to be larger to make the connection stronger and reduce the risk of the insulating member 4 falling off.

[0093] Specifically, in the embodiment of the present application, the number of connection marks 401 is plural, and the connection marks 401 are arranged at intervals in the circumferential direction of the wall surface of the support 3 away from the battery core assembly 2. In other embodiments of the present application, the connection marks 401 may extend annularly in the circumferential direction of the wall surface of the support 3 away from the battery core assembly 2, in order to strengthen the connection between the insulating member 4 and the support 3, sufficiently improve the reliability of the connection between the insulating member 4 and the support 3, and reduce the risk of the insulating member 4 falling off.

[0094] It should be noted that in the embodiments of the present application, the shape of the connection mark 401 may be rectangular, circular, elliptical, or irregular. The arrangement of the connection marks 401 may be selected according to the actual shapes of the battery core assembly 2 and the support 3. For example, if the cross-sectional shapes of the battery core assembly 2 and the support 3 are square or rectangular, the connection marks 401 may be distributed near the four sides of the support 3, or may be concentrated near the opposing sides of the support 3. Furthermore, for example, if the cross-sectional shapes of the battery core assembly 2 and the support 3 are circular, the connection marks 401 may be uniformly distributed in the circumferential direction of the wall of the support 3 away from the battery core assembly 2.

[0095] Of course, the distribution pattern of the multiple connection marks 401 is not limited to the above pattern, and the spacing between two adjacent connection marks 401 may be adjusted according to needs. 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 member 4 and the support 3.

[0096] While the battery core assembly 2 is described as a rectangular parallelepiped in the example, in the embodiments of the present application, the support 3 may be a rectangular plate-like member having a corresponding shape, and the support 3 is installed on one wall of the battery core assembly 2, and the insulating member 4 wraps around the remaining five circumferential walls of the battery core assembly 2 to ensure the insulating effect between the battery core assembly 2 and the casing 11. At the same time, the connection marks 401 formed by the insulating member 4 and the wall of the support 3 away from the battery core assembly 2 may be installed adjacent to the circumferential edge of the support 3, and may be adjacent to two, three, or four circumferential edges of the support 3. The number of connection marks 401 formed by connecting the insulating member 4 near the corresponding edges may be increased or decreased according to the dimensions of the corresponding edges, and is not limited to any particular embodiment of the present application.

[0097] In the above technical solution, on the one hand, the hot melt connection facilitates the fitting of the insulating member 4 and the support 3, improves assembly efficiency, ensures the efficiency of mounting the battery core assembly 2 to the casing, and saves assembly and manufacturing costs; on the other hand, regardless of whether the connection marks 401 extend annularly or are spaced apart circumferentially, it can improve the robustness of the connection between the insulating member 4 and the support 3, improve the reliability and stability of the connection between the insulating member 4 and the support 3, and sufficiently reduce the risk of the insulating member 4 falling off; at the same time, by arranging the connection marks 401 at intervals circumferentially compared to when they extend annularly, it can also save materials and reduce costs by ensuring the reliability of the connection between the insulating member 4 and the support 3.

[0098] Referring again to FIGS. 4 and 5, according to some embodiments of the present application, referring again to FIGS. 3 to 5, in the embodiments of the present application, the battery core assembly 2 specifically includes an active material-coated portion 21 and a conductive portion 22. The active material-coated portion 21 is housed in the casing 11. The active material-coated portion 21 is a portion of the battery core assembly 2 to which active material is applied and can assist in the insertion and desorption of metal ions during the charge and discharge process of the battery cell 10. The conductive portion 22 is a metal structure that electrically connects the active material-coated portion 21 and the electrode post 12 and is not coated with active material. At the same time, the conductive portion 22 is connected to the side of the active material-coated portion 21 adjacent to the support 3. The conductive portion 22 extends to the electrode post 12 and is connected to the electrode post 12 to enable the charge and discharge operation of the battery cell 10. The insulating member 4 specifically covers the active material-coated portion 21 circumferentially together with the support 3. That is, all surfaces of the battery core assembly 2 are covered by the insulating member 4 and the support 3 together, except for the conductive portion 22 that extends out of the support 3 and connects to the pole 12 .

[0099] In the above technical solution, the insulating member 4 and the support 3 jointly cover the active material application portion 21 in the circumferential direction. This, on the one hand, completely separates the active material application portion 21 from the casing 11, reduces the exposure of the active material application portion 21, reduces the risk of failure and damage to the battery core assembly 2, and improves the reliability and stability of the battery cell 10. On the other hand, it reduces the size of the insulating member 4 and saves the cost of the insulating member 4. At the same time, the support 3 stabilizes and protects the insulating member 4, fully ensuring the reliability and stability of the battery cell 10.

[0100] For illustrative purposes, in the present embodiment, the active material-coated portion 21 is divided into a positive electrode active material-coated portion and a negative electrode active material-coated portion, the positive electrode active material-coated portion includes a portion of the positive electrode current collector coated with a positive electrode active material layer, and the negative electrode active material-coated portion includes a portion of the negative electrode current collector coated with a current collector active material layer. The conductive portion 22 is divided into a positive electrode conductive portion and a negative electrode conductive portion, the positive electrode conductive portion electrically connects the positive electrode active material-coated portion and the positive electrode pole, and the negative electrode conductive portion electrically connects the negative electrode active material-coated portion and the negative electrode pole.

[0101] 11 to 13, Fig. 11 is a structural schematic diagram of an insulating member of a battery cell in an unfolded state according to some embodiments of the present application, and Fig. 12 is a structural schematic diagram of an insulating member of a battery cell in an unfolded state according to some other embodiments of the present application. .figure 13 is a structural schematic diagram of an insulating member of a battery cell in an unfolded state according to further embodiments of the present application. In the embodiments of the present application, the insulating member 4 has an unfolded state and a covering state. When the insulating member 4 is in the unfolded state, the insulating member 4 does not encase the battery core assembly 2 and has a planar structure. When the insulating member 4 is in the covering state, the insulating member 4 and the support 3 jointly cover the active material application portion 21 in the circumferential direction. Arranging the insulating member 4 in a planar structure when unfolded is advantageous for realizing the insulating member 4 covering the battery core assembly 2, facilitating the transition of the insulating member 4 to the covering state, and improving the convenience of assembling the battery cell 10.

[0102] 15 to 17, Fig. 15 is a structural schematic diagram of an insulating member for a battery cell in a covered state according to some embodiments of the present application. Fig. 16 is a structural cross-sectional view of the battery cell shown in Fig. 15. Fig. 17 is a structural schematic diagram of an insulating member for a battery cell before wrapping a battery core assembly according to some embodiments of the present application. In the embodiment of the present application, the insulating member 4 includes a main insulating portion 41, a first insulating portion 42, and a second insulating portion 43, and the first insulating portion 42 and the second insulating portion 43 are respectively disposed on both ends of the main insulating portion 41. The main insulating part 41 wraps around the peripheral edge of the active material application part 21, the first insulating part 42 is located on the side of the main insulating part 41 away from the support 3 and wraps around the end of the active material application part 21 away from the support 3, the second insulating part 43 is located on the side of the main insulating part 41 close to the support 3 and engages with the support 3, and the second insulating part 43, together with the support 3, covers the end of the active material application part 21 close to the support 3.

[0103] Here, the cross section of the active material-applied portion 21 may be circular, rectangular, polygonal, or the like. When the cross section of the active material-applied portion 21 is circular, the main insulating portion 41 may be wound in a shape that matches the shape of the peripheral side (cylindrical surface) of the active material-applied portion 21 to enclose the peripheral side of the active material-applied portion 21; that is, the cross section of the main insulating portion 41 is annular. When the cross section of the active material-applied portion 21 is rectangular, the main insulating portion 41 may be folded in a shape that matches the shape of the peripheral side (four side wall surfaces) of the active material-applied portion 21 to enclose the peripheral side of the active material-applied portion 21; that is, the cross section of the main insulating portion 41 is rectangular annular. When the cross section of the active material application portion 21 is polygonal, the main insulating portion 41 may be folded into a shape that matches the shape of the peripheral side (multiple side wall surfaces) of the active material application portion 21 in order to wrap around the peripheral side of the active material application portion 21, i.e., the cross-sectional shape of the main insulating portion 41 is a polygonal ring.

[0104] 15 to 17, when the battery cell 10 is placed vertically, the support 3 is provided on the upper side of the active material application portion 21 (the side of the active material application portion 21 indicated by the upward arrow in the Z direction), the conductive portion 22 passes through the support 3, the main insulating portion 41 encases the peripheral side of the active material application portion 21, and the first insulating portion 42 encases the lower side of the active material application portion 21 (the side of the active material application portion 21 indicated by the downward arrow in the Z direction), and referring again to FIGS. 8 to 10, the second insulating portion 43, together with the support 3, covers the upper side of the active material application portion 21. As a result, the insulating member 4 is composed of multiple parts, and the multiple parts, together with the support 3, can cover the sides, bottom and top of the active material application portion 21, completely separating the active material application portion 21 from the casing 11, thereby sufficiently reducing the exposure of the active material application portion 21, reducing the risk of failure and damage to the battery core assembly 2, reducing the risk of corrosion of the casing 11, and improving the reliability and stability of the battery cell 10.

[0105] Referring again to Figures 11 and 17, in the embodiment of the present application, the main insulating part 41 may include a plurality of main parts 410, which are connected end to end in a ring shape, and which jointly surround the peripheral side of the active material application part 21, and the first insulating part 42 and the second insulating part 43 are respectively located at both ends of the ring structure consisting of the plurality of main parts 410.

[0106] Specifically, the number of main body portions 410 may be two, three, or more than three, and may be selected depending on the shape of the active material-applied portion 21. For example, the number of main body portions 410 may be arranged in one-to-one correspondence with the number of peripheral surfaces of the active material-applied portion 21, i.e., multiple main body portions 410 cover multiple peripheral surfaces of the active material-applied portion in one-to-one correspondence. Alternatively, for example, the number of main body portions 410 may be fewer than the number of peripheral surfaces of the active material-applied portion 21, i.e., when the insulating member 4 is in the unfolded state, the surface area of ​​at least one main body portion 410 is larger than the surface area of ​​one peripheral surface of the active material-applied portion 21, and thus the main body portion 410 can be used to cover two or more peripheral surfaces of the active material-applied portion 21. Alternatively, for example, the number of main body portions 410 may be greater than the number of peripheral surfaces of the active material-applied portion 21, and thus multiple main body portions 410 may be arranged so that at least a portion of each main body portion 410 overlaps with one another.

[0107] The multiple main body parts 410 are connected to form a ring, completely enveloping the peripheral side of the active material application part 21 and completely separating the peripheral side of the active material application part 21 from the inner wall of the casing 11, thereby reducing the risk of exposure of the active material application part 21 and improving the reliability and stability of the battery cell 10.

[0108] As an alternative solution, in the embodiments of the present application, the connection positions of any two adjacent main body parts 410 partially overlap. In the above technical solution, on the one hand, because the connection positions of the main body parts 410 overlap, the connection positions will not be easily separated or cut, reducing the probability and risk of insulation failure at the overlapping portions, improving the reliability of the battery core assembly 2 and the stability and reliability of the battery cell 10. On the other hand, because the connection positions of the main body parts 410 overlap, it is possible to fully ensure that the insulating member 4 fully surrounds the active material-coated portion 21 in the circumferential direction, sufficiently reducing the exposure of the active material-coated portion 21, reducing the risk of corrosion of the casing 11, and further improving the reliability and stability of the battery core assembly 2 and the battery cell 10.

[0109] Further optionally, in an embodiment of the present application, the peripheral side of the active material application portion 21 has multiple surfaces. Referring again to FIG. 13 , each main body portion 410 includes a main body surface and two flanges installed on both sides of the main body surface, and any two adjacent main body portions 410 are connected by the flanges, and the connection structure of each main body surface and the two flanges respectively encloses different surfaces on the peripheral side of the active material application portion 21.

[0110] Specifically, the peripheral side of the active material application portion 21 may have four, six or more sides, and in an embodiment in which the peripheral side of the active material application portion 21 has four sides, the number of main body portions 410 may be two, and the main body surfaces of the two main body portions 410 may cover two oppositely arranged sides of the active material application portion 21, and the flanges on the same side of the two main body portions 410 may be connected together and cover the other side of the active material application portion 21.

[0111] In an embodiment in which the peripheral side of the active material application portion 21 has six faces, the peripheral side of the active material application portion 21 may be defined as having three first faces and three second faces, and the three first faces and the three second faces are arranged alternately in the circumferential direction of the active material application portion, i.e., one second face is provided between two adjacent first faces, and one first face is provided between two adjacent second faces. Correspondingly, the number of main body portions 410 may be three, and the main body faces of the three main body portions 410 can respectively cover the three spaced-apart first faces of the active material application portion 21, and the flanges of two adjacent main body portions 410 can be connected together and cover the second face of the active material application portion 21.

[0112] In the above technical solution, on the one hand, any two adjacent main body parts 410 are connected by flanges, thereby ensuring the reliability of the connection and improving the reliability and stability of the battery core assembly 2 and the battery cell 10; on the other hand, the main body surface and the connection positions of the two flanges respectively enclose different surfaces on the peripheral side of the active material application part 21, thereby effectively enclosing all surfaces on the peripheral side of the active material application part 21, thereby further improving the reliability of the battery core assembly 2 and improving the stability and reliability of the battery cell 10.

[0113] Referring again to FIG. 13, the flange widths of the multiple main body portions 410 may or may not be equal. For example, as shown in FIG. 14, in this embodiment, the difference in the flange widths on the same side of two adjacent main body portions 410 may be L, where L is greater than zero.

[0114] More specifically, referring again to FIGS. 8 to 10, in some embodiments, the peripheral edge side of the active material applied portion 21 has four faces, that is, the cross-sectional outer contour shape of the active material applied portion 21 is quadrangular.

[0115] 11 and 12, the main insulating part 41 includes two main parts 410, which are disposed on either side of the first insulating part 42, and are respectively a first main part 411 and a second main part 412. As shown in FIG. 13, the first main part 411 includes a first main part surface 4111, a first flange 4112, and a second flange 4113, and the first flange 4112 and the second flange 4113 are respectively disposed on either side of the first main part surface 4111. The second main part 412 includes a second main part surface 4121, a third flange 4122, and a fourth flange 4123, and the third flange 4122 and the fourth flange 4123 are respectively disposed on either side of the second main part surface 4121.

[0116] 15 and 17, the first flange 4112 and the third flange 4122 are connected, the second flange 4113 and the fourth flange 4123 are connected, and the connection structure of the first main surface 4111, the first flange 4112 and the third flange 4122, and the connection structure of the second main surface 4121, the second flange 4113 and the fourth flange 4123 respectively enclose four surfaces arranged sequentially in the circumferential direction of the active material application portion 21.

[0117] In order to clearly explain the structures of the first main body part 411 and the second main body part 412, four auxiliary lines, i.e., four first boundary lines 401a, are drawn in Figure 13, two of which divide the first main body part 411 into a first main body surface 4111, a first flange 4112, and a second flange 4113, and the other two first boundary lines 401a divide the second main body part 412 into a second main body surface 4121, a third flange 4122, and a fourth flange 4123.

[0118] Specifically, when the insulating member 4 is in an expanded state, one widthwise end of the first main body surface 4111 and one widthwise end of the second main body surface 4121 are connected via the first insulating part 42, a first flange 4112 is provided at one longitudinal end of the first main body surface 4111, and a second flange 4113 is provided at the other end, i.e., the first main body surface 4111 separates the first flange 4112 and the second flange 4113, and a third flange 4122 is provided at one longitudinal end of the second main body surface 4121, and a fourth flange 4123 is provided at the other end, i.e., the second main body surface 4121 separates the third flange 4122 and the fourth flange 4123.

[0119] 8 to 10 and 15 to 17 again, when the insulating member 4 is in a covered state, the first flange 4112 and the third flange 4122 are connected, and the second flange 4113 and the fourth flange 4123 are connected, and the connection structure of the first main body surface 4111, the first flange 4112 and the third flange 4122, and the connection structure of the second main body surface 4121, the second flange 4113 and the fourth flange 4123 are formed into an annular structure, so that the first main body surface 4111 and the second main body surface 4121 can cover two opposing surfaces of the active material application portion 21, and the connection structure of the first flange 4112 and the third flange 4122 and the connection structure of the second flange 4113 and the fourth flange 4123 can cover the other two opposing surfaces of the active material application portion 21, respectively.

[0120] In the embodiment of the present application, the peripheral side of the active material application portion 21 has four surfaces: two large surfaces arranged opposite each other and two small surfaces arranged opposite each other; the first main surface 4111 and the second main surface 4121 respectively cover the two large surfaces arranged opposite each other on the peripheral side of the active material application portion 21; the first flange 4112 and the third flange 4122 are connected and cover one small surface on the peripheral side of the active material application portion 21; the second flange 4113 and the fourth flange 4123 are connected and cover the other small surface on the peripheral side of the active material application portion 21; the first insulating portion 42 covers the end of the active material application portion 21 away from the support 3; the second insulating portion 43 is fitted with the support 3; and the second insulating portion 43, together with the support 3, covers the end of the active material application portion 21 close to the support 3.

[0121] When the peripheral side of the active material application portion 21 has four surfaces, the battery cell 10 is approximately rectangular, and in this case, the first main body portion 411, the second main body portion 412, and their connection structure completely cover the four peripheral sides of the active material application portion 21 and completely separate the four peripheral sides of the active material application portion 21 from the inner wall of the casing, thereby reducing the risk of exposure of the active material application portion 21 and sufficiently improving the reliability and stability of the rectangular battery cell 10.

[0122] Referring again to Figures 11 to 13, in some embodiments, the first insulating part 42 has a center line 42a, and the first main body part 411 and the second main body part 412 are respectively located on either side of the center line 42a of the first insulating part 42, and the first main body part 411 and the second main body part 412 are arranged symmetrically with the center line 42a as the axis of symmetry, or the first main body surface 4111 and the second main body surface 4121 are arranged symmetrically.

[0123] Specifically, in the process of covering the battery core assembly 2 with the insulating member 4, first, one main body 410 of the insulating member 4 is placed over one surface of the peripheral edge of the active material application portion 21, and then the other main body 410 of the insulating member 4 is placed over the other surface of the peripheral edge of the active material application portion 21, so that the two main bodies 410 are first used to cover the two opposing surfaces of the peripheral edge of the active material application portion 21, and then the subsequent wrapping operation can be performed. Wrapping can also be done in the opposite direction, which is easy to operate and advantageous for improving manufacturing efficiency.

[0124] If the two main body parts 410 are completely symmetrical, the mold opening and manufacturing of the insulating member 4 will be easier, costs will be saved, and manufacturing efficiency will be improved. If the two main body surfaces are arranged symmetrically, the flanges of the two main body parts 410 do not need to be arranged symmetrically. In this case, the flange of one main body part 410 can be arranged long and the flange of the adjacent main body part 410 can be arranged short. When the two main body parts 410 are connected, the long flange can surround the short flange. This will reduce the risk of exposure of the active material application part 21 and the risk of corrosion of the casing 11, and will significantly improve the reliability and stability of the rectangular battery cell 10.

[0125] Of course, when the insulating member 4 is in the expanded state, the insulating member 4 may have a non-axisymmetric structure, and the insulating member 4 may be cut according to needs, which is not limited in the embodiments of the present application.

[0126] Referring again to Figures 11 and 15 to 17, in the embodiment of the present application, the second insulating portion 43 includes a plurality of sub-insulating portions 430, which are connected to a plurality of main portions 410 in one-to-one correspondence, and any two adjacent sub-insulating portions 430 partially overlap each other.

[0127] Specifically, when the insulating member 4 is in a covered state, the multiple sub-insulating portions 430 of the second insulating portion 43 are located on a wall surface away from the active material application portion 21 of the support 3, and the multiple sub-insulating portions 430 are arranged circumferentially around the support 3, with any two adjacent sub-insulating portions 430 being partially overlapped. As a result, the multiple sub-insulating portions 430 are connected to form an annular second insulating portion 43, which effectively reduces the corrosion of the casing 11 due to exposure of the active material application portion 21.

[0128] In the process of installing the battery core assembly 2 with the support 3 in the casing 11, the support 3 first enters the casing 11, and the second insulating portion 43 is located on the wall surface of the support 3 away from the active material application portion 21, so that the insulating member 4 can enter the casing 11 along the installation direction. The casing 11 does not rub against the edge of the insulating member 4, and the movement and sliding of the insulating member 4 is reduced. After the support 3 and the battery core assembly 2 are installed in the designated position in the casing 11, the second insulating portion 43 is pressed between the wall surface facing the opening 1110 of the casing 11 and the support 3, which further reduces the risk of the insulating member 4 falling off, reduces the corrosion of the casing 11 due to the exposure of the active material application portion 21, and makes installation easier.

[0129] 11 again, the widths of the sub-insulating portions 430 of the second insulating portion 43 may be set to be equal. Referring to FIG. 12, the widths of the sub-insulating portions 430 of the second insulating portion 43 may be set to be unequal, and may be specifically selected according to actual needs.

[0130] Referring again to Figure 14, each sub-insulating portion 430 includes a main surface 431 and two sub-surfaces 432, the main surface 431 is connected to the main surface of the corresponding main body portion 410, the two sub-surfaces 432 are respectively connected to two flanges of the corresponding main body portion 410, the two sub-surfaces 432 corresponding to any two adjacent flanges are connected and installed, and each sub-surface 432 is connected and installed to the adjacent main surface 431.

[0131] In order to clearly explain the structures of the first main body part 411 and the second main body part 412, auxiliary lines, namely, a first boundary line 401a, a second boundary line 401b, and a third boundary line 401c, are drawn in FIG. 14, and two of the first boundary lines 401a divide the first main body part 411 into a first main body surface 4111, a first flange 4112, and a second flange 4113, and the other two first boundary lines 401a divide the second main body part 412 into a second flange 4113. It is divided into a main surface 4121, a third flange 4122 and a fourth flange 4123, and the second boundary line 401b is the boundary line between the main surface 431 of the second insulating part 43 and the first main surface 4111 / second main surface 4121, and the four third boundary lines 401c are the boundary lines between the four sub-surfaces 432 corresponding to the first flange 4112, the second flange 4113, the third flange 4122 and the fourth flange 4123, respectively.

[0132] In the above technical solution, by setting the main surface 431 and the sub-surface 432, the insulating member 4 can be easily coated on the outside of the battery core assembly 2, which ensures manufacturing and assembly efficiency and saves manufacturing and assembly costs.

[0133] In some embodiments, the two sub-surfaces 432 corresponding to any two adjacent flanges are partially overlapping, and / or each sub-surface 432 is partially overlapping with the adjacent major surface 431.

[0134] Specifically, when the insulating member 4 and the support 3 jointly enclose the active material application portion 21, one of the two adjacent sub-surfaces 432 can cover a portion of the other, and at least a portion of the main surface 431 may be covered outside the two sub-surfaces 432, or at least a portion of the two sub-surfaces 432 may be covered outside the main surface 431.

[0135] Regardless of whether the two sub-surfaces 432 are installed overlapping each other or whether the sub-surface 432 is installed overlapping with the adjacent main surface 431, it is possible to fully ensure that the entire insulating member 4 is tightly fitted with the support 3, so that the entire insulating member 4 and the support 3 are fitted together to surround the active material coating portion 21 in the circumferential direction, thereby fully reducing the exposure of the active material coating 21, reducing the risk of corrosion of the casing 11, and improving the stability and reliability of the battery cell 10.

[0136] 13 and 14, in some embodiments, when sub-insulation portion 430 is in the deployed state, the edge of sub-surface 432 adjacent to major surface 431 is a hypotenuse, and / or the edge of major surface 431 adjacent to sub-surface 432 is a hypotenuse. In other embodiments, sub-surface 432 is angular, triangular, or trapezoidal, and major surface 431 is correspondingly angular, triangular, or trapezoidal.

[0137] In other words, when the insulating member 4 is in a covered state, one of the longitudinal edges of the sub-insulating portion 430 is recessed inward relative to the edge of the support 3, preventing the sub-insulating portion 430 from going beyond the edge of the support 3, thereby reducing the probability that the casing 11 will rub against the edge of the insulating member 4.

[0138] Here, the width of the main surface 431 may or may not be equal to the width of the sub-surface 432. For example, as shown in FIG. 14, in this embodiment, the difference between the width of the sub-surface 432 and the width of the main surface 431 is H, and H is greater than zero.

[0139] In some embodiments, there is a notch 44 at the connection position between the main insulating portion 41 and the first insulating portion 42, and / or there is a notch 44 at the connection position between the main insulating portion 41 and the second insulating portion 43. The notch 44 here is the boundary between the main insulating portion 41 and the first insulating portion 42 / second insulating portion 43, and may be pressed by a marking press or other equipment after the insulating member 4 is manufactured, or may be pre-formed during the manufacturing process of the insulating member 4 by reducing the thickness of the insulating member 4 at the notch 44.

[0140] In the above technical solution, on the one hand, the provision of the notch 44 allows the insulating member 4 to be easily folded to smoothly encase the active material application portion 21, which is advantageous for improving production and manufacturing efficiency and saving production and manufacturing costs; on the other hand, such provision reduces errors in the process of the insulating member 4 coating the active material application portion 21, improving the precision and reliability of the coating of the insulating member 4 and the support 3, and further improving the stability and reliability of the battery cell 10.

[0141] 8 to 11 again, in order to facilitate connection of the conductive portion 22 from the side of the active material coated portion 21 closest to the support 3 to the electrode post 12, in the embodiment of the present application, a through hole 311 is opened in the support 3, and the conductive portion 22 passes through the through hole 311 and is connected to the electrode post 12, so that it can be connected to the electrode post 12 on the casing 11. Here, the shape of the through hole 311 can be selected depending on the shape of the conductive portion 22.

[0142] In the above technical solution, on the one hand, by providing the through holes 311 in the supports 3, the supports 3 can fulfill the role of converging and accommodating the conductive parts 22, facilitating the connection between the conductive parts 22 and the poles 12 and improving the reliability and convenience of assembling the battery cells 10; on the other hand, by using the supports 3 to converge the conductive parts 22, the original plastic member structure of the battery cells 10 can be omitted, and the fitting of the supports 3 and the insulating member 4 can achieve insulation between the entire battery core assembly 2 and the casing 11, thereby effectively reducing manufacturing and production costs.

[0143] In some embodiments of the present application, the support 3 may have an integral structure or a separate structure. Referring to FIG. 18 , FIG. 18 is a structural schematic diagram of the support 3 of the battery cell 10 according to some embodiments of the present application. When the support 3 has an integral structure, the through-hole 311 is formed as a through-hole penetrating the support 3. This allows the support 3 to be easily processed and has high reliability, facilitating assembly of the support 3 with the casing 11 and the pole 12, and improving assembly efficiency and mating stability. It should be understood that the processing method for the support 3 can be specifically selected depending on the material of the support 3. For example, when the support 3 is made of an insulating plastic material, the support 3 with an integral structure can be obtained by injection molding.

[0144] 19, which is a structural schematic diagram of the support 3 of the battery cell 10 according to some other embodiments of the present application. When the support 3 has a separate structure, the support 3 may include a first support 33 and a second support 34 that are molded separately, and a through hole 311 is defined between the first support 33 and the second support 34.

[0145] In the present embodiment, the first support 33 and the second support 34 are both elongated plate-like structures, and may be detachably connected; for example, they may be fitted together by insertion or engagement, facilitating assembly. At the same time, the first support 33 has a semi-perforated structure on the side adjacent to the second support 34, and the second support 34 has another semi-perforated structure matching the shape on the side adjacent to the first support 33. The semi-perforated structures of the first support 33 and the second support 34 collectively surround the annular through-hole 311. That is, the through-hole 311 is defined between the first support 33 and the second support 34.

[0146] In the above technical solution, the through hole 311 is defined by the engagement between the first support 33 and the second support 34, and when the support 3 is assembled to the battery core assembly 2, there is no need to pass the conductive part 22 through the through hole 311 from one end to the other. The first support 33 and the second support 34 can be assembled at the position of the conductive part 22 to clamp the conductive part 22, as the through hole 311 surrounds the conductive part 22, which makes it easier to assemble the support 3 and the battery core assembly 2 and improves assembly efficiency.

[0147] As an alternative solution, when the cross section of the through hole 311 is elongated, the first support 33 and the second support 34 are respectively arranged on both sides of the width of the through hole 311; for example, when the width of the through hole 311 is the left-right direction, the first support 33 and the second support 34 are located on the left and right sides of the through hole 311, making it easier to fit the first support 33 and the second support 34 to the conductive part 22.

[0148] 20, which is a schematic cross-sectional view of a battery cell according to some embodiments of the present application. A receiving groove 393 communicating with the through-hole 311 is formed on the side of the support 3 away from the active material-coated portion 21, and the receiving groove 393 receives at least a portion of the electrode post 12. The shape of the receiving groove 393 can be adapted to the shape of the electrode post 12.

[0149] In the above technical solution, on the one hand, the receiving groove 393 receives at least a portion of the electrode post 12, making the overall structure of the battery cell 10 more compact and reliable, which is beneficial to improving the energy density of the entire battery; on the other hand, the provision of the receiving groove 393 allows the electrode post 12 and the casing 11 to be partially insulated by the support 3, further improving the stability and reliability of the battery cell 10; and the receiving groove 393 receives the electrode post 12, which improves the stability and reliability of the electrode post 12, thereby ensuring the stability and reliability of the battery cell 10 during the charge and discharge process.

[0150] 21, which is a structural cross-sectional view of a battery cell support according to some embodiments of the present application. A guide portion 32 is provided on the side of the support 3 away from the active material coated portion 21. The guide portion 32 surrounds the through hole 311 in the circumferential direction and extends in a direction approaching the electrode post 12.

[0151] In some embodiments, the guide portion 32 may be an annular boss extending along the circumferential direction of the through hole 311. In other embodiments, the guide portion 32 may include two boss structures disposed opposite each other, the two boss structures being 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 disposed opposite each other in the width direction of the elongated hole, with each boss structure extending along the length direction of the elongated hole.

[0152] The conductive portion 22 passes through the through hole 311, and the guide portion 32 can restrain, converge, and support the conductive portion 22, making it easier to connect the conductive portion 22 to the pole 12 and improving the assembly efficiency and assembly quality of the battery cell 10.

[0153] Referring again to Figure 21, according to some embodiments of the present application, a guide groove 312 is formed on the side of the support 3 facing the active material application portion 21, the guide groove 312 is connected to the through hole 311, the guide groove 312 accommodates at least a portion of the conductive portion 22, and the cross-sectional area of ​​the guide groove 312 gradually increases along the direction toward the active material application portion 21 of the support 3.

[0154] Specifically, the groove wall of the guide groove 312 may be an inclined surface or an arcuate surface extending from the inside to the outside in the direction approaching the active material application portion 21, and here, "inside" refers to a position close to the center of the guide groove 312, and conversely, "outside" here refers to a position away from the center of the guide groove 312, i.e., a position close to the edge of the guide groove 312.

[0155] The guide groove 312 can not only accommodate the conductive portion 22, but also retract the conductive portion 22 and prevent the conductive portion 22 from being crushed, thereby reducing the probability of the conductive portion 22 becoming loose or folded over, and reducing redundancy.

[0156] 22 and 23, Fig. 22 is a top view of a support for a battery cell according to some embodiments of the present application. Fig. 23 is a top view of a support for a battery cell according to some other embodiments of the present application. The support 3 has at least one first liquid injection guide groove 392, and the first liquid injection guide groove 392 is located on the side of the support 3 facing the active material coated portion 21.

[0157] During injection, the electrolyte flows along first injection guide groove 392, which increases the fluidity of the electrolyte, improves the injection speed, and shortens the time for leaving the electrolyte for chemical formation. Furthermore, the provision of first injection guide groove 392 increases the contact area between the electrolyte and active material-coated portion 21, thereby alleviating the problem of poor penetration of active material-coated portion 21.

[0158] Here, at least one first liquid injection guide groove 392 is connected to the guide groove 312, and the electrolyte that flows into the casing 11 can flow along the first liquid injection guide groove 392 toward the guide groove 312, allowing the electrolyte to flow to a predetermined position, further increasing the contact area between the electrolyte and the active material application portion 21.

[0159] Referring again to FIG. 22, in an embodiment in which the support 3 has an integral structure and two poles 12 are installed in the casing 11, both ends of the first liquid injection guide groove 392 can correspond to the positions of the two poles 12, respectively, and both ends of the first liquid injection guide groove 392 are connected to the two guide grooves 312, respectively, so that the electrolyte can flow along the first liquid injection guide groove 392 toward the two guide grooves 312.

[0160] Referring again to FIG. 23 , in an embodiment in which the support 3 has a separate structure and two poles 12 are installed in the casing 11, the support 3 may include a first support 33 and a second support 34 that are separately molded, a through hole 311 is defined between the first support 33 and the second support 34, and the first support 33 and the second support 34 are each provided with at least one first liquid injection guide groove 392, both ends of which may correspond to the positions of the two poles 12, and both ends of the first liquid injection guide groove 392 are connected to the two guide grooves 312, so that the electrolyte can flow along the first liquid injection guide groove 392 toward the two guide grooves 312.

[0161] According to some embodiments of the present application, a second liquid injection guide groove (not shown) may be provided on the support 3 according to needs, and the second liquid injection guide groove is located on the side of the support 3 that is away from the battery core assembly 2. By providing such an arrangement, the electrolyte can flow along the first liquid injection guide groove 392 and / or the second liquid injection guide groove during injection, thereby increasing the fluidity of the electrolyte, improving the injection speed, and shortening the anodization standing time.

[0162] It should be noted that in the embodiments of the present application, the depth of the first liquid injection guide groove 392 and / or the second liquid injection guide groove is 0.1 mm or more. For example, the depth of the first liquid injection guide groove 392 and the second liquid injection guide groove may be 0.1 mm, 0.2 mm, 0.5 mm, etc., and may be specifically selected according to actual needs.

[0163] 24 and 25, Fig. 24 is a front view of a battery cell according to some embodiments of the present application. Fig. 25 is a front view of a battery cell according to some other embodiments of the present application. One side of the support 3 is provided with a position limiting protrusion 38 that engages with the battery core assembly 2.

[0164] For example, in the embodiment of the present application, the position limiting protrusions 38 may surround the peripheral edge of the battery core assembly 2 so that the position limiting protrusions 38 can engage with the battery core assembly 2. Also, for example, the position limiting protrusions 38 can abut against the end of the battery core assembly 2. For ease of understanding, the battery core assembly 2 may be defined as having a first end 201 and a second end 202 disposed opposite each other, and the position limiting protrusion 38 is located on the outside of the side wall adjacent to the first end 201 of the battery core assembly 2. During the process of attaching the battery core assembly 2 with the support 3 to the casing 11, the first end 201 of the battery core assembly 2 with the support 3 first enters the casing 11. As the assembly process progresses, the first end 201 of the battery core assembly 2 gradually moves away from the opening 1110 within the casing 11. During the assembly process, the position limiting protrusion 38 is located between the side wall of the battery core assembly 2 and the casing 11. After the battery core assembly 2 and the support 3 are attached in place within the casing 11, the support 3 is located between the wall facing the opening 1110 of the casing 11 and the first end 201 of the battery core assembly 2.

[0165] By installing it in this manner, the position limiting protrusion 38 restrains one end of the battery core assembly 2, reduces the probability that the outer layer of the battery core assembly 2 becomes loose, and further protects one end of the battery core assembly 2, reducing the problem of one end of the battery core assembly 2 coming into contact with the casing 11, thereby reducing the occurrence of the phenomenon in which the casing 11 damages the battery core assembly 2 during the process of attaching it to the casing 11.

[0166] 24 again, the position limiting protrusion 38 forms an annular protrusion, and the annular protrusion extends along the circumferential direction of the battery core assembly 2. That is, the position limiting protrusion 38 may be an integral structure, and the position limiting protrusion 38 is fitted onto the outside of the battery core assembly 2. In this way, the position limiting protrusion 38 restrains the battery core assembly 2 in the circumferential direction of the battery core assembly 2, more effectively reducing the probability that the outer layer of the battery core assembly 2 becomes loose, and further protects one end of the battery core assembly 2, reducing the problem of one end of the battery core assembly 2 contacting the casing 11, thereby reducing the occurrence of the phenomenon in which the casing 11 damages the battery core assembly 2.

[0167] Referring again to Figure 25, in some embodiments, the position limiting protrusions 38 may be multiple, and the multiple position limiting protrusions 38 are arranged at intervals around the circumferential direction of the battery core assembly 2, with a gap between two adjacent position limiting protrusions 38. By arranging them in this manner, the position limiting protrusions 38 not only reduce material and cost by restraining and protecting the battery core assembly 2, but also facilitate the assembly of the support 3 and the battery core assembly 2.

[0168] Of course, the arrangement of the position-limiting protrusions 38 is not limited to the above, and may be specifically selected according to actual needs.

[0169] Here, the position limiting protrusion 38 is attached to the side wall of the battery core assembly 2, or there is a gap between the position limiting protrusion 38 and the side wall of the battery core assembly 2. That is, the position limiting protrusion 38 may or may not contact the side wall of the battery core assembly 2. The position limiting protrusion 38 stops the side wall of the battery core assembly 2, reduces the probability that the outer layer of the battery core assembly 2 becomes loose, protects the side wall of the battery core assembly 2, and reduces the problem of one end of the battery core assembly 2 contacting the casing 11.

[0170] 26, which is a partial structural cross-sectional view of a battery cell 10 according to some embodiments of the present application. The surface of the position-limiting protrusion 38 facing the active material-coated portion 21 may include a first surface 381, which is bonded to the side wall of the active material-coated portion 21. The first surface 381 restrains the battery core assembly 2, reduces the likelihood that the outer layer of the active material-coated portion 21 will become loose, and protects the side wall of the active material-coated portion 21, thereby mitigating the problem of one end of the active material-coated portion 21 coming into contact with the casing 11.

[0171] 27, which is a partial structural cross-sectional view of a battery cell 10 according to some other embodiments of the present application. The surface of the position-limiting protrusion 38 facing the active material applied portion 21 may include a second surface 382, ​​and the distance between the second surface 382 and the active material applied portion 21 gradually increases along the direction in which the support 3 faces the opening 1110. That is, the second surface 382 extends obliquely in a direction away from the base of the position-limiting protrusion 38 and the side wall of the active material applied portion 21. For example, the second surface 382 may be an inclined surface or an arcuate surface.

[0172] By being installed in this manner, the second surface 382 can stop the side wall of the active material coating portion 21, reduce the probability that the outer layer of the active material coating portion 21 will become fluffy, and further protect the side wall of the active material coating portion 21. In addition, the second surface 382 can act as a guide, making assembly easier and improving the assembly efficiency of the battery core assembly 2 and the support 3.

[0173] 28, which is a partial structural cross-sectional view of a battery cell 10 according to some embodiments of the present application. The surface of the position-limiting protrusion 38 facing the active material applied portion 21 can include a first surface 381 and a second surface 382, ​​the first surface 381 is attached to the side wall of the active material applied portion 21, the distance between the second surface 382 and the active material applied portion 21 gradually increases along the direction in which the support 3 faces the opening 1110, and the first surface 381 is located between the base of the position-limiting protrusion 38 and the second surface 382.

[0174] Specifically, the contour line of the first surface 381 may be a straight line extending vertically along the height direction of the support 3, and the contour line of the second surface 382 may be a diagonal line inclined along the height direction of the support 3. By being arranged in this manner, it not only plays a good restraining role on the active material application portion 21 and effectively reduces the probability of the outer layer of the active material application portion 21 becoming fluffy, but also facilitates assembly and improves the assembly efficiency of the battery core assembly 2 and the support 3.

[0175] 29, which is a partial structural cross-sectional view of a battery cell according to some other embodiments of the present application. The support 3 has a recess 391 on the side facing the battery core assembly 2, and the recess 391 can escape from the edge of the battery core assembly 2 on the side facing the support 3, thereby reducing the risk of the support 3 crushing the battery core assembly 2.

[0176] Specifically, in an embodiment in which the support 3 has a position limiting protrusion 38, a rounded corner may appear at the base of the position limiting protrusion 38 on the side close to the center of the support 3 during molding. The provision of the recess 391 eliminates the rounded corner and prevents the rounded corner from crushing the outer edge of the battery core assembly 2. Here, the recess 391 may be a groove opening toward the battery core assembly 2. For example, the groove may be an annular groove. For example, there may be multiple grooves, and the multiple grooves may be spaced apart. The shape of the groove may be selected according to the actual situation. Of course, the recess 391 may also be a sloped or arcuate surface for escaping the battery core assembly 2. Any structure for escaping the battery core assembly 2 falls within the scope of protection of the present application and is not specifically limited herein. In other embodiments of the present application, the side of the support 3 facing the battery core assembly 2 completely contacts the battery core assembly 2, i.e., there is no recess structure on the side of the support 3 facing the battery core assembly 2.

[0177] 20 again, in the embodiment of the present application, the conductive portion 22 is connected to the side of the active material coated portion 21 that is closest to the support 3, the electrode post 12 is provided with a receiving portion 121, and at least a part of the guide portion 32 extends into the receiving portion 121 and is used to guide the conductive portion 22 to be received in the receiving portion 121 and to facilitate the electrical connection and engagement between the conductive portion 22 and the electrode post 12. In other words, the electrode post 12 is installed as a hollow structure.

[0178] Here, "at least a portion" means that the conductive portion 22 may be completely housed in the housing portion 121, or that only a portion of the conductive portion 22 may be housed in the housing portion 121. Because the housing portion 121 is provided in the pole 12, the hollow structure of the housing portion 121 can reduce the weight of the pole 12 to some extent, thereby improving the weight-energy density of the battery cell 10 and the battery 100. At the same time, by providing the pole 12 with a hollow structure and fitting the guide portion 32 into the hollow structure, the conductive portion 22 can be guided to connect to the pole 12, improving connection reliability and ensuring assembly efficiency and quality. On the other hand, the conductive portion 22 can be accommodated in the receiving portion 121, improving assembly efficiency of the conductive portion 22 and saving the space occupied by the conductive portion 22. By fully utilizing the space of the battery cell 10, the fit between the support 3 and the pole 12 and between the support 3 and the conductive portion 22 is tighter and more reliable, making the structure of the battery cell 10 more compact and more advantageous for improving the energy density of the battery cell 10.

[0179] More specifically, by accommodating a part or all of the conductive portion 22 in the accommodation portion 121, the portion of the conductive portion 22 located in the accommodation portion 121 can occupy space within the electrode post 12, thereby reducing the space occupied by the conductive portion 22 within the casing 11. When the dimensions of the casing 11 are fixed, it is possible to accommodate a larger-sized active material-coated portion 21 and save some space within the casing 11 to improve the volumetric energy density of the battery cell 10. For example, when the conductive portion 22 is pulled out from the side of the active material-coated portion 21 closest to the electrode post 12, the space occupied by the conductive portion 22 between the active material-coated portion 21 and the electrode post 12 can be saved. This allows the dimension of the active material-coated portion 21 in the pulling direction of the conductive portion 22 to be increased, reducing the gap between the active material-coated portion 21 and the electrode post 12, thereby improving the energy density of the battery cell 10.

[0180] At the same time, by accommodating at least a portion of the conductive portion 22 in the accommodating portion 121, the space occupied by the battery cell 10 itself can be reduced, allowing a battery 100 of the same volume to accommodate more battery cells 10, thereby improving the volumetric energy density of the battery 100. Furthermore, by accommodating at least a portion of the conductive portion 22 in the accommodating portion 121 to occupy space within the pole 12, the redundancy of the conductive portion 22 within the casing 11 can be reduced to at least some extent, reducing the probability of a short circuit between the conductive portion 22 and the active material-coated portion 21 and the battery cell 10, thereby improving the reliability and stability of the operation of the battery cell 10 and the battery 100. Next, by accommodating at least a portion of the conductive portion 22 in the accommodating portion 121, the accommodating portion 121 can stabilize and restrain the conductive portion 22, facilitating the orderly execution of welding operations between the conductive portion 22 and the pole 12.

[0181] It should be noted that in the embodiment of the present application, the location of the accommodating portion 121 can be located not only on the side facing the active material coated portion 21 of the pole 12 but also on the side away from the active material coated portion 21 of the pole 12.

[0182] 30 and 31, for example. Fig. 30 is a schematic cross-sectional view of a battery cell according to some embodiments of the present application. Fig. 31 is a schematic cross-sectional view of a battery cell according to some embodiments of the present application. When the receiving portion 121 is located on the side facing the active material coated portion 21 of the electrode post 12, the receiving portion 121 includes a first receiving groove 12110, the surface of the electrode post 12 facing the active material coated portion 21 is the electrode post inner end surface 122, the groove opening of the first receiving groove 12110 is formed in the electrode post inner end surface 122, and at least a portion of the conductive portion 22 is received in the first receiving groove 12110.

[0183] For example, the first accommodating groove 12110 is a groove body, and the groove body has a groove-like structure with a certain depth. For example, when the electrode post 12 is installed on the upper end wall of the casing 11 and the electrode post inner end surface 122 is the lower surface of the electrode post 12, the first accommodating groove 12110 is formed as an accommodating groove with a groove opening downward and groove walls recessed upward. For example, when the electrode post 12 is installed on the lower end wall of the casing 11 and the electrode post inner end surface 122 is the upper surface of the electrode post 12, the first accommodating groove 12110 is formed as an accommodating groove with a groove opening upward and groove walls recessed downward.

[0184] In the above technical solution, on the one hand, by forming the first accommodating groove 12110 in the pole 12, the weight of the pole 12 can be reduced to a certain extent, thereby improving the weight-to-energy density of the battery cell 10 and the battery 100. On the other hand, because the groove opening of the first accommodating groove 12110 is formed on the pole inner end surface 122, which is the surface close to the active material applied portion 21 of the pole 12, the first accommodating groove 12110 can open toward the active material applied portion 21, and the conductive portion 22 can easily extend into the first accommodating groove 12110, improving assembly efficiency. In addition, such a first accommodating groove 12110 is easy to process, improving production efficiency.

[0185] Furthermore, the first accommodating groove 12110 can be easily processed to have a larger volume and can accommodate more conductive parts 22. At the same time, because the first accommodating groove 12110 opens toward the active material application portion 21, the first accommodating groove 12110 can be used as a buffer and temporary storage structure for the electrolyte. The casing 11 can accommodate more electrolyte. Since the electrolyte is consumed during the charging and discharging process of the battery cell 10, an increased amount of electrolyte can extend the service life of the battery cell 10. Furthermore, because the first accommodating groove 12110 opens toward the active material application portion 21, the first accommodating groove 12110 can also be used as a buffer and storage structure for gas generated inside the battery core assembly 2, which can reduce the expansion of the battery cell 10 and improve the reliability and stability of the battery cell 10.

[0186] Furthermore, since the first accommodating groove 12110 is located inside the pole 12, external foreign objects and impurities are less likely to enter the first accommodating groove 12110, which reduces the impact of external foreign objects and impurities on the battery core assembly 2, improving the stability and reliability of the operation of the battery core assembly 2 and further improving the stability and reliability of the battery cell 10 and the battery 100.

[0187] 30 again, in the embodiment of the present application, the method of connecting the terminal post 12 and the casing 11 is not limited and may be, for example, welding or riveting. For example, if the two are fitted together by riveting, the casing 11 has a mounting hole 113, and the terminal post 12 is attached to the mounting hole 113 by riveting. Of course, if the two are fitted together by welding or another method, the casing 11 may have a mounting hole 113 so that the terminal post 12 can be easily attached to the casing 11 through the mounting hole 113, and the method is not limited here.

[0188] At the same time, the first accommodating groove 12110 can be installed corresponding to the position of the mounting hole 113; in other words, on a projection plane perpendicular to the axial direction R of the pole 12, the orthogonal projection of the first accommodating groove 12110 is located within the orthogonal projection range of the mounting hole 113. Therefore, the first accommodating groove 12110 can have a large depth to accommodate more conductive parts 22, and further the space occupied by the conductive parts 22 in the casing 11 can be significantly reduced.

[0189] Specifically, when a mounting hole 113 is opened in the casing 11 and the pole 12 is mounted in the mounting hole 113, the depth H1 of the first accommodating groove 12110 along the axial direction R of the pole 12 is greater than or equal to the minimum distance H2 from the pole inner end face 122 to the mounting hole 113.

[0190] It should be noted that the specific shape of the first receiving groove 12110 is not limited and may be a regular or irregular shape, such as a cylindrical groove having a rectangular, elliptical, or racetrack cross section, a trapezoidal groove having a rectangular cross section with gradually varying cross-sectional dimensions, a hemispherical groove having a circular cross section with gradually varying cross-sectional dimensions, or a semi-elliptical groove having an elliptical cross section with gradually varying cross-sectional dimensions, 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.

[0191] In the axial direction R of the pole 12, the depth H1 of the first accommodating groove 12110 is equal to or greater than the minimum distance H2 from the pole inner end surface 122 to the mounting hole 113. This allows full utilization of the volume of the pole 12, making the first accommodating groove 12110 deeper, which is advantageous for accommodating more conductive parts 22 and significantly reducing the space occupied by the conductive parts 22 in the casing 11, further improving the energy density of the battery cell 10 and further reducing the redundancy of the conductive parts 22 in the casing 11. At the same time, the first accommodating groove 12110 is relatively deep, which allows it to accommodate gas generated in the battery core assembly 2 and ensure the reliability and stability of the battery cell 10. It can also accommodate more electrolyte to ensure the service life of the battery cell 10.

[0192] Referring again to Figures 30 and 31, in order to ensure the stability and reliability of the electrical connection between the active material application portion 21 and the electrode post 12, in some embodiments of the present application, the electrical connection position between the conductive portion 22 and the electrode post 12 can be located on the groove wall of the first accommodating groove 12110 formed by the accommodating portion 121.

[0193] For example, the conductive portion 22 and the terminal post 12 may be electrically connected by welding, and the electrical connection position is the welding position between the conductive portion 22 and the terminal post 12. At the same time, the welding method between the conductive portion 22 and the terminal post 12 is not limited, and may be, for example, laser welding. Depending on factors such as the position, angle, or structure of the welding portion, vertical welding, oblique welding, lap welding, edge welding, etc. may be selected. In other embodiments of the present application, the electrical connection between the conductive portion 22 and the terminal post 12 may be achieved by other methods instead of welding, such as by installing a conductive adhesive or a conductive pin. For simplicity of explanation, the following description will be given taking the example of the conductive portion 22 and the terminal post 12 being electrically connected by welding, and the welding position being the electrical connection position between the conductive portion 22 and the terminal post 12.

[0194] Specifically, the electrode post 12 includes a first end wall 12111 and a first side wall 12113, the first end wall 12111 being located on the side of the first side wall 12113 away from the active material coated portion 21, the first end wall 12111 and the first side wall 12113 surrounding each other forming a first accommodating groove 12110, and the electrical connection position between the conductive portion 22 and the electrode post 12 being located on the first end wall 12111 and / or the first side wall 12113. In other words, the conductive portion 22 may be welded to at least one of the first end wall 12111 and the first side wall 12113.

[0195] In the above technical solution, the electrical connection position between the conductive portion 22 and the pole 12 is located on at least one of the first end wall 12111 and the first side wall 12113. This allows the first receiving groove 12110 to receive at least a portion of the conductive portion 22, and the groove wall of the first receiving groove 12110 to establish the electrical connection with the conductive portion 22. This simplifies the structure of the pole 12, facilitating its processing, and also simplifies the structure of the conductive portion 22, reducing the redundancy of the conductive portion 22 and reducing the cost of the conductive portion 22. Furthermore, using the groove wall of the first receiving groove 12110 to establish the electrical connection with the conductive portion 22 allows for a relatively large electrical connection area between the conductive portion 22 and the pole 12. This not only simplifies the difficulty of the electrical connection, but also improves the reliability and stability of the electrical connection, thereby improving the performance of the battery cell 10.

[0196] Furthermore, since the electrical connection position between the conductive portion 22 and the pole 12 is located within the first accommodating groove 12110, not only is it possible to prevent the electrical connection position from protruding outside the pole 12 and occupying space other than the pole 12, but the electrical connection position is protected by the pole 12, thereby improving the reliability and stability of the electrical connection between the conductive portion 22 and the pole 12.

[0197] In addition, in the embodiments of the present application, the first end wall 12111 is configured as a sealed structure without any through holes in order to isolate the first accommodating groove 12110 from the external space of the casing 11, thereby avoiding the problem of the electrolyte in the casing 11 leaking from the first accommodating groove 12110.

[0198] 30 and 31 , in some optional embodiments, the local shape of the conductive portion 22 is adapted to the local shape of the first end wall 12111, and the conductive portion 22 is attached to the local shape of the first end wall 12111 so that the electrical connection position between the conductive portion 22 and the first end wall 12111 extends in the lengthwise or widthwise direction of the first end wall 12111. For example, if the first end wall 12111 is flat, the local portion of the conductive portion 22 is also flat and is placed in close contact with the first end wall 12111, and is electrically connected to the first end wall 12111 through the close contact position, for example, by welding. This increases the electrical connection area and improves the reliability and stability of the electrical connection.

[0199] Furthermore, when the electrical connection between the conductive portion 22 and the first end wall 12111 is made by welding, the first end wall 12111 is located on the side of the first accommodating groove 12110 away from the active material application portion 21, making the welding work easier, and for example, welding may be performed from the side of the pole 12 away from the active material application portion 21.

[0200] It should be noted that the shape of the first end wall 12111 is not limited, and may be, for example, a flat plate or an arcuate plate. Here, when the first end wall 12111 has a flat structure, the first end wall 12111 is disposed at an angle with the axial direction R of the pole 12, and may be, for example, a flat plate structure perpendicular to the axial direction R of the pole 12, or may be, for example, an inclined plate structure not perpendicular to the axial direction R of the pole 12, but the inclination direction is not limited.

[0201] Of course, in other embodiments of the present application, the electrical connection position between the conductive portion 22 and the first end wall 12111 does not necessarily extend along the length or width of the first end wall 12111, but may be, for example, a plurality of discretely located points, for example, the conductive portion 22 has a plurality of spaced apart portions that are each welded to the first end wall 12111, and the description of these will be omitted here.

[0202] 32, which is a schematic cross-sectional view of a battery cell according to some embodiments of the present application. When the conductive portion 22 is electrically connected to the first end wall 12111, a first sunken groove 12112 may be provided in the first end wall 12111, and the sunken direction of the first sunken groove 12112 is a direction away from the active material coated portion 21. At least a portion of the position where the conductive portion 22 is electrically connected to the first end wall 12111 is located within the first sunken groove 12112. For example, at least a portion of the conductive portion 22 may be located within the first sunken groove 12112 and connected to a portion of the first end wall 12111 that defines the first sunken groove 12112.

[0203] In the above technical solution, on the one hand, the first sunken groove 12112 can be used to pre-position and limit the position of the conductive part 22 at the electrical connection position, which is advantageous not only for achieving accurate positioning and electrical connection and improving production efficiency, but also for improving the stability and reliability of the conductive part 22 and ensuring the stability and reliability of the charge and discharge processes of the battery cell 10. On the other hand, by providing the first sunken groove 12112 in the first end wall 12111, the wall thickness of the first end wall 12111 can be locally thinned, which is advantageous not only for welding but also for reducing the weight of the electrode post 12 and improving the weight-energy density of the battery cell 10.

[0204] Referring again to Figures 31 and 32, in the embodiments of the present application, a first groove 126 may be further installed in the pole 12 if necessary, and the first groove 126 is located on the side of the pole 12 away from the active material application portion 21, i.e., the surface of the pole 12 away from the active material application portion 21 is the pole outer end surface 123, and the groove opening of the first groove 126 is formed on the pole outer end surface 123.

[0205] As can be understood, the first groove 126 is a groove body, and the groove body is a groove-like structure with a certain depth. When the pole 12 is installed on the upper end wall of the casing 11 and the pole outer end surface 123 is the upper surface of the pole 12, the first groove 126 has an opening upward and a groove wall that is recessed downward (i.e., near the battery core assembly 2). direction For example, when the pole 12 is installed on the lower end wall of the casing 11 and the pole outer end surface 123 is the lower surface of the pole 12, the first groove 126 has an opening downward and a groove wall recessed upward (i.e., away from the battery core assembly 2). direction The first groove is formed as a first recessed groove.

[0206] In the above technical solution, on the one hand, the first groove 126 is provided on the pole 12, which further reduces the weight of the pole 12 and improves the weight energy density of the battery cells 10 and the battery 100. On the other hand, the first groove 126 is located on the outside of the pole 12, i.e., it opens toward the side of the pole 12 that is away from the inside of the casing 11. The first groove 126 can be used to accommodate or mount structural members electrically connected to each battery cell 10 in the battery 100, so as to fully utilize the space within the pole 12 and improve the space utilization rate and volumetric energy density of the battery 100.

[0207] Furthermore, by simultaneously providing the first receiving groove 12110 and the first groove 126 in the electrode post 12, the first groove 126 is located on the side of the first receiving groove 12110 away from the active material applied portion 21, and the first groove 126 opens in a direction away from the first receiving groove 12110. This makes it convenient to laser-weld the conductive portion 22 and the first end wall 12111 through the first groove 126 from the outside of the electrode post 12, i.e., from the side of the electrode post 12 away from the active material applied portion 21. That is, the electrical connection between the conductive portion 22 and the electrode post 12 can be easily achieved by external welding. In other words, the above structure and installation makes it easy to externally weld the electrode post 12 and the conductive portion 22 through the first groove 126, facilitating the processing and manufacturing of the battery cell 10 and reducing processing and manufacturing costs.

[0208] Furthermore, in order to easily and effectively weld the conductive portion 22 and the groove wall of the first accommodating groove 12110 through the first groove 126 and improve the welding reliability between the conductive portion 22 and the groove wall of the first accommodating groove 12110, in the embodiments of the present application, the portion between the first groove 126 and the first accommodating groove 12110 can be laser welded to the conductive portion 22, that is, the spacing portion 127 shown in Figure 32 can be laser welded to the conductive portion 22 to realize an electrical connection between the battery core assembly 2 and the pole 12. The thickness of the spacing portion 127 of the pole post 12 located between the first groove 126 and the first accommodating groove 12110 is relatively thin, and the spacing portion 127 separates the first groove 126 from the first accommodating groove 12110. The wall surface of the spacing portion 127 closest to the active material application portion 21 can be the first end wall 12111. When it is necessary to weld the conductive portion 22 to the first end wall 12111, the relatively thin thickness of the spacing portion 127 is advantageous for realizing welding between the conductive portion 22 and the first end wall 12111 through the first groove 126, improving the convenience and reliability of welding.

[0209] In some embodiments, the first accommodating groove 12110 may be configured with a cross-sectional shape whose length is greater than its width, such as a rectangle, oval, or racetrack shape, and the weld mark formed by welding the conductive portion 22 to the terminal post 12 may be an elongated weld mark parallel to the length direction of the first accommodating groove 12110 to improve the reliability of the weld and increase the current passing capacity. For example, when an elongated weld mark is formed by welding the conductive portion 22 to the first end wall 12111, the width of the weld mark may be 6 mm or more, and the distance between the weld mark and the first side wall 12113 may be 1 mm or more to ensure the convenience and reliability of the weld and maintain the current passing capacity of the battery cell 10.

[0210] Referring again to FIG. 31, the battery cell 10 further includes a groove cover 7, which is attached to the pole 12 and seals the opening of the first groove 126.

[0211] In the above technical solution, by installing a groove cover 7 to seal the first groove 126, the electrode post 12 can achieve an indirect electrical connection with the bus member via the groove cover 7. The position and structure of the groove cover 7 make the electrical connection between the groove cover 7 and the bus member more convenient and increase the electrical connection area. Therefore, installing the groove cover 7 facilitates the electrical connection between adjacent battery cells 10 in the battery 100. Furthermore, because the electrical connection positions between the battery cells 10 are located on the groove cover 7, the electrical connection positions between the conductive parts 22 and the electrode post 12 can be separated by the first groove 126, reducing interference between them and further improving the stability and reliability of the battery cells 10.

[0212] For example, refer to Figure 33, which is a local cross-sectional schematic diagram of a battery cell provided by some embodiments of the present application, where the accommodating portion 121 may be configured to include a second accommodating groove 12120, the surface of the pole 12 facing away from the active material application portion 21 is the pole outer end surface 123, the groove opening of the second accommodating groove 12120 is formed in the pole outer end surface 123, the second accommodating groove 12120 communicates with the inside of the casing 11 through a through hole 12130, and the conductive portion 22 is drilled in the through hole 12130 and is at least partially accommodated in the second accommodating groove 12120.

[0213] As can be understood, the second accommodating groove 12120 is a groove body, which has a groove-like structure with a certain depth. For example, when the electrode post 12 is installed on the upper end wall of the casing 11 and the electrode post outer end surface 123 is the upper surface of the electrode post 12, the second accommodating groove 12120 is formed as an accommodating groove with an opening facing upward and groove walls recessed downward. Also, when the electrode post 12 is installed on the lower end wall of the casing 11 and the electrode post outer end surface 123 is the lower surface of the electrode post 12, the second accommodating groove 12120 is formed as an accommodating groove with an opening facing downward and groove walls recessed upward.

[0214] 33 again, in the above technical solution, on the one hand, by providing the second accommodating groove 12120 on the pole 12, the weight of the pole 12 can be reduced to a certain extent, and the weight energy density of the battery cell 10 and the battery 100 can be improved; on the other hand, the groove opening of the second accommodating groove 12120 is formed on the pole outer end surface 123, and the pole outer end surface 123 is a surface away from the active material application portion 21 of the pole 12, so the second accommodating groove 12120 can In this way, when at least a portion of the conductive portion 22 is accommodated in the second accommodating groove 12120, the conductive portion 22 can be easily accommodated and organized through the groove opening of the second accommodating groove 12120, and electrical connection between the conductive portion 22 and the pole 12 can be easily achieved through the groove opening of the second accommodating groove 12120, thereby reducing the difficulty of manufacturing the battery cell 10 and improving the manufacturing efficiency of the battery cell 10.

[0215] At the same time, since the second accommodating groove 12120 can pass through the through-hole 12130 and communicate with the inside of the casing 11, the second accommodating groove 12120 can be used as a buffering and temporary storage structure for the electrolyte. The casing 11 can accommodate more electrolyte. Since the electrolyte is consumed during the charging and discharging process of the battery cell 10, the more electrolyte there is, the longer the service life of the battery cell 10 can be. Furthermore, since the second accommodating groove 12120 can pass through the through-hole 12130 and communicate with the inside of the casing 11, the second accommodating groove 12120 can also be used as a buffering structure for the gas generated inside the battery core assembly 2, which can reduce the expansion of the battery cell 10 and improve the reliability and stability of the battery cell 10.

[0216] It should be noted that when the accommodating portion 121 has a second accommodating groove 12120, the conductive portion 22 is drilled in the through hole 12130, and at least a portion of the conductive portion 22 is accommodated in the second accommodating groove 12120, the electrical connection position between the conductive portion 22 and the pole 12 is not limited.

[0217] For example, when the conductive portion 22 is drilled in the through hole 12130 and at least partially accommodated in the second accommodating groove 12120, in the embodiment of the present application, the electrical connection position between the conductive portion 22 and the pole 12 is located on the hole wall of the through hole 12130 formed by the pole 12.

[0218] In the above technical solution, the electrical connection position between the conductive part 22 and the pole 12 is located on the hole wall of the through hole 12130, which makes it easy to electrically connect the conductive part 22 and the pole 12 through the second accommodating groove 12120. Furthermore, when the electrical connection area between the conductive part 22 and the pole 12 is relatively large, the electrical connection between the conductive part 22 and the pole 12 can realize the sealing of the through hole 12130, thereby saving sealing costs and reducing electrolyte leakage and saving sealing parts.

[0219] Specifically, the conductive part 22 can be welded to the wall of the through hole 12130 at the position where the through hole 12130 connects to the second accommodating groove 12120, making the work easy, and in order to improve the problem of the electrolyte in the casing 11 leaking from the through hole 12130, the weld mark and the conductive part 22 can be sealed by controlling the welding imprint.

[0220] Furthermore, for example, when the conductive portion 22 is drilled in the through-hole 12130 and at least partially received in the second receiving groove 12120, in some other embodiments of the present application, the electrical connection position between the conductive portion 22 and the electrode post 12 can be located on the groove wall of the second receiving groove 12120 formed by the electrode post 12. This facilitates the electrical connection operation and, for example, when the conductive portion 22 is welded to the groove wall of the second receiving groove 12120 formed by the electrode post 12, prevents conductive particles produced by welding from entering the casing 11 and causing problems such as short circuits.

[0221] Referring again to Figure 33, 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 close to the active material application portion 21, the second end wall 12121 and the second side wall 12123 surround each other to form a second accommodating groove 12120, a through hole 12130 is opened in the second end wall 12121, and the electrical connection position between the conductive portion 22 and the electrode post 12 is located in the second end wall 12121 and / or the second side wall 12123.

[0222] More specifically, the conductive portion 22 and the electrode post 12 can be electrically connected by welding, and therefore the welding position is the electrical connection position between the conductive portion 22 and the electrode post 12. In other embodiments of the present application, the conductive portion 22 and the electrode post 12 can be electrically connected by other methods instead of welding, such as by using a conductive adhesive or installing a conductive pin, and the description thereof will be omitted here.

[0223] For the sake of simplicity, the following description will be given taking as an example the conductive portion 22 and the electrode post 12 form an electrical connection, and the welding position is the electrical connection position between the conductive portion 22 and the electrode post 12. For example, in some embodiments, the electrical connection position between the conductive portion 22 and the electrode post 12 is located on the second end wall 12121 and / or the second side wall 12123, and the conductive portion 22 may be welded to at least one of the second end wall 12121 and the second side wall 12123.

[0224] In the above technical solution, the electrical connection position between the conductive portion 22 and the electrode post 12 is located on at least one of the second end wall 12121 and the second side wall 12123. This allows the second receiving groove 12120 to not only receive at least a portion of the conductive portion 22, but also allows the groove wall of the second receiving groove 12120 to achieve electrical connection with the conductive portion 22, thereby simplifying the structure of the electrode post 12 and facilitating processing of the electrode post 12. Furthermore, the through hole 12130 is formed in the second end wall 12121, allowing the conductive portion 22 to easily pass through the through hole 12130 and extend into the second receiving groove 12120. This simplifies the structure of the conductive portion 22, reduces redundancy of the conductive portion 22, and reduces the cost of the conductive portion 22. Furthermore, due to the opening direction of the groove opening of the second accommodating groove 12120, the electrical connection operation between the conductive part 22 and the groove wall of the second accommodating groove 12120 can be easily performed through the groove opening of the second accommodating groove 12120, reducing the difficulty of the electrical connection. Furthermore, the electrical connection with the conductive part 22 can be realized using the groove wall of the second accommodating groove 12120, thereby making the electrical connection area between the conductive part 22 and the pole 12 relatively large, improving the reliability and stability of the electrical connection and ultimately improving the performance of the battery cell 10.

[0225] Furthermore, since the electrical connection position between the conductive portion 22 and the pole 12 is located within the second accommodating groove 12120, not only is it possible to prevent the electrical connection position from protruding outside the pole 12 and occupying space other than the pole 12, but the electrical connection position is protected by the pole 12, thereby improving the reliability and stability of the electrical connection between the conductive portion 22 and the pole 12.

[0226] 33 again, in some embodiments, the local shape of the conductive portion 22 is adapted to the local shape of the second end wall 12121, and the conductive portion 22 is attached to the second end wall 12121 to establish an electrical connection between the conductive portion 22 and the second end wall 12121, so that the electrical connection extends in the lengthwise or widthwise direction of the second end wall 12121. For example, if the second end wall 12121 is flat, the conductive portion 22 may also be flat and be placed in close contact with the second end wall 12121, and the close contact portion may be electrically connected by, for example, welding. This increases the electrical connection area and improves the reliability and stability of the electrical connection.

[0227] It should be noted that the shape of the second end wall 12121 is not limited, and may be, for example, a flat plate-like structure, an arc-shaped plate-like structure, etc. Here, when the second end wall 12121 has a flat plate-like structure, the second end wall 12121 is disposed at an angle with the axial direction R of the pole post 12, and may be, for example, a flat plate-like structure perpendicular to the axial direction R of the pole post 12, or may be, for example, an inclined plate structure not perpendicular to the axial direction R of the pole post 12, but the inclination direction is not limited.

[0228] 33, when the second end wall 12121 has a flat plate-like structure, the angle θ between the second end wall 12121 and the axial direction R of the electrode post 12 is equal to 90°, that is, the second end wall 12121 and the active material coating portion 21 are equidistant from each other along the direction from the through hole 12130 to the second side wall 12123. This facilitates welding of the conductive portion 22 and the second end wall 12121.

[0229] Furthermore, for example, the angle θ between the second end wall 12121 and the axial direction R of the electrode post 12 is greater than 90°. In other words, the second end wall 12121 extends obliquely from the through hole 12130 to the second side wall 12123 toward the active material coated portion 21. This increases the extension distance of the conductive portion 22 along the second end wall 12121, thereby improving the reliability of the electrical connection. For example, the angle θ between the second end wall 12121 and the axial direction R of the electrode post 12 is 90° to 145°, and may be, for example, 100°, 110°, 120°, 130°, or 140°. This, on the one hand, facilitates processing of the second end wall 12121 and electrical connection with the conductive portion 22, and, on the other hand, allows the space within the electrode post 12 to be relatively fully utilized to accommodate the conductive portion 22.

[0230] Furthermore, for example, the angle θ between the second end wall 12121 and the axial direction R of the electrode post 12 is less than 90°. That is, the second end wall 12121 extends obliquely from the through hole 12130 to the second side wall 12123, away from the active material coated portion 21. This increases the extension distance of the conductive portion 22 along the second end wall 12121, thereby improving the reliability of the electrical connection. For example, the angle θ between the second end wall 12121 and the axial direction R of the electrode post 12 is 45° to 90°, and may be, for example, 50°, 60°, 70°, or 80°. On the one hand, this facilitates processing of the second end wall 12121 and electrical connection with the conductive portion 22, and on the other hand, it allows the space within the electrode post 12 to be relatively fully utilized to accommodate the conductive portion 22.

[0231] Of course, the present invention is not limited to these, and in other embodiments of the present application, the position at which the conductive portion 22 is electrically connected to the second end wall 12121 does not have to extend along the length or width of the second end wall 12121, but may be a plurality of discretely located points, for example, the conductive portion 22 has a plurality of portions that are spaced apart and each welded to the second end wall 12121, but the description of this will be omitted here.

[0232] Referring again to FIG. 33 and further to FIG. 34, FIG. 34 is a schematic cross-sectional view of a battery cell according to some embodiments of the present application. Regardless of the specific value of the angle θ between the second end wall 12121 and the axial direction R of the pole 12, in any embodiment of the present application, when the conductive portion 22 is electrically connected to the second end wall 12121, a second recessed groove 12122 can be provided in the second end wall 12121 according to needs. The second recessed groove 12122 is a recess formed by recessing a portion of the second end wall 12121 into one end adjacent to the active material application portion. At least a portion of the position where the conductive portion 22 is electrically connected to the second end wall 12121 is located within the second recessed groove 12122.

[0233] In the above technical solution, the portion of the conductive part 22 located within the second sunken groove 12122 is installed to fit the shape of the second sunken groove 12122 and is attached and installed to achieve electrical connection, so that the second sunken groove 12122 can be used to pre-position and limit the position of the electrical connection position of the conductive part 22, and the electrical connection can be performed with accurate alignment, which is beneficial to improving production efficiency and can improve the stability and reliability of the electrical connection position, thereby ensuring the reliability and stability of the charging and discharging operations of the battery cell 10.

[0234] 34 again, in the embodiments of the present application, the method of connecting the terminal post 12 and the casing 11 is not limited and may be, for example, welding or riveting. For example, when the two are fitted together by riveting, the casing 11 has a mounting hole 113 and the terminal post 12 is attached to the mounting hole 113 by riveting. Of course, when the two are fitted together by welding or another method, it is understood that the casing 11 may have a mounting hole 113 and the terminal post 12 is attached to the mounting hole 113.

[0235] Optionally, referring again to FIG. 33, the second accommodating groove 12120 may be installed corresponding to the position of the mounting hole 113. In other words, on a projection plane perpendicular to the axial direction R of the pole 12, the orthogonal projection of the second accommodating groove 12120 is located within the orthogonal projection range of the mounting hole 113. This allows the second accommodating groove 12120 to have a relatively large depth and accommodate more conductive parts 22, thereby significantly reducing the space occupied by the conductive parts 22 in the casing 11.

[0236] In some embodiments, referring again to FIG. 33, when the casing 11 has a mounting hole 113 and the pole 12 is mounted in the mounting hole 113, the depth H3 of the second accommodating groove 12120 along the axial direction R of the pole 12 is greater than or equal to the minimum distance H4 from the pole outer end surface 123 to the mounting hole 113.

[0237] It should be noted that the specific shape of the second receiving groove 12120 is not particularly limited and may be a regular or irregular shape, such as a cylindrical groove with a uniform cross section, such as a rectangular, elliptical, or racetrack-shaped cross section, a trapezoidal groove with a rectangular cross section and gradually varying cross-sectional dimensions, a hemispherical groove with a circular cross section and gradually varying cross-sectional dimensions, or a semi-elliptical groove with an elliptical cross section and gradually varying cross-sectional dimensions, etc. It should be noted that the racetrack shape described herein refers to a shape in which the two short sides of a rectangle are replaced with convex curves.

[0238] Therefore, the depth H3 of the second accommodating groove 12120 refers to the maximum depth of the second accommodating groove 12120 along the axial direction R of the electrode post 12. In the axial direction R of the electrode post 12, the depth H3 of the second accommodating groove 12120 is equal to or greater than the minimum distance H4 from the electrode post outer end surface 123 to the mounting hole 113. This allows the volume of the electrode post 12 to be fully utilized, resulting in a deeper second accommodating groove 12120, which is advantageous for accommodating more conductive parts 22 and significantly reducing the space occupied by the conductive parts 22 within the casing 11, thereby further improving the energy density of the battery cell 10 and reducing the redundancy of the conductive parts 22 within the casing 11. At the same time, the second accommodating groove 12120 has a relatively deep depth, which can accommodate gas generated in the battery core assembly 2 and ensure the reliability and stability of the battery cell 10. It can also accommodate more electrolyte to ensure the service life of the battery cell 10.

[0239] Referring to Figure 34, and further to Figures 35 and 36, Figure 35 is a schematic local cross-sectional view of a battery cell 10 provided in some embodiments of the present application, and Figure 36 is an exploded structural view of the battery cell 10 shown in Figure 35. In the embodiments of the present application, when the accommodating portion 121 has the second accommodating groove 12120 of any of the above embodiments, optionally, the battery cell 10 can further include a first cover plate 13, which is fitted to the pole 12 and seals the groove opening of the second accommodating groove 12120, and the first cover plate 13 is electrically connected to the pole 12.

[0240] In the above technical proposal, by installing the first cover plate 13 so as to seal the groove opening of the second accommodating groove 12120, it is possible to prevent the electrolyte in the casing 11 from leaking from the groove opening of the second accommodating groove 12120. Furthermore, since the first cover plate 13 seals the groove opening of the second accommodating groove 12120 and is electrically connected to the pole 12, it is possible to easily realize an indirect electrical connection between the pole 12 and the bus member using the first cover plate 13, which is advantageous for increasing the connection area of ​​the electrical connection point and therefore reducing the resistance of the electrical connection point.

[0241] It should be noted that the method and position of fitting the first cover plate 13 and the terminal post 12 are not limited as long as the groove opening of the second accommodating groove 12120 of the first cover plate 13 can be sealed. For example, in some embodiments, the first cover plate 13 may be welded to the terminal post 12, and during processing, the conductive portion 22 may first be passed through the through hole 12130 and welded to the groove wall of the second accommodating groove 12120, and then the first cover plate 13 and the terminal post 12 may be welded to seal the groove opening of the second accommodating groove 12120.

[0242] It should be further explained that the specific configuration of the first cover plate 13 is not limited. For example, in some optional embodiments, Fig. 37 is a structural exploded view of the first cover plate shown in Fig. 36, and with reference to Figs. 35 to 37, the first cover plate 13 includes a first conductive member 131 and a second conductive member 132 made of different materials, the first conductive member 131 is fitted to and electrically connected with the pole 12, and the second conductive member 132 is fitted to and electrically connected with the first conductive member 131.

[0243] In the above technical solution, the first cover plate 13 is installed in a composite form, and the first conductive member 131 is installed so that it is made of the same material as the electrode post 12, which facilitates electrical connection between the first conductive member 131 and the electrode post 12. For example, the first conductive member 131 can be easily and reliably connected to the electrode post 12 by welding. Furthermore, because the second conductive member 132 and the first conductive member 131 are made of a different material, the second conductive member 132 can be easily used to electrically connect to bus members made of a different material from the electrode post 12. For example, the second conductive member 132 can be easily and reliably connected to bus members made of the same material as the second conductive member 132 by welding.

[0244] For example, if the electrode post 12 is a negative electrode post, the electrode post 12 is a copper post, and the bus member is an aluminum sheet, the first conductive member 131 can be mounted on the copper material and the second conductive member 132 can be mounted on the aluminum material. In this case, the electrode post 12 and the first conductive member 131 are made of the same material and can be effectively welded together, and the second conductive member 132 and the bus member are made of the same material and can be effectively welded together, thereby effectively realizing an indirect electrical connection between the electrode post 12 and the bus member via the first cover plate 13. In addition, the electrode post 12 and the first conductive member 131 are welded together, which is advantageous in that it has good fluidity, is less likely to crack, and improves the sealing effect of the welded joints.

[0245] 35 to 37 again, in some selectable examples, the first conductive member 131 is located between the second accommodating groove 12120 and the second conductive member 132. In the above technical solution, since the first conductive member 131 is located between the second accommodating groove 12120 and the second conductive member 132, the second accommodating groove 12120 and the second conductive member 132 can be separated from each other. As a result, when the electrolyte in the casing 11 enters the second accommodating groove 12120 from the through-hole 12130, the first conductive member 131 can be used to prevent contact between this partial electrolyte and the second conductive member 132, in order to prevent the electrolyte from leaking in the circumferential direction from the second conductive member 132.

[0246] It should be noted that the method of fitting the first conductive member 131 and the second conductive member 132 is not limited. For example, in some embodiments, referring to FIGS. 35 to 37, the first conductive member 131 has a second groove 1311, the second conductive member 132 is fitted into the second groove 1311, and the opening of the second groove 1311 is formed on the surface of the first conductive member 131 away from the second receiving groove 12120 so that the second conductive member 132 is exposed from the opening of the second groove 1311. Alternatively, in other embodiments, the method of connecting the first conductive member 131 and the second conductive member 132 may be a fastening connection, an engagement, or the like.

[0247] It should be further explained that the second conductive member 132 being "exposed" from the groove opening of the second groove 1311 means that the first conductive member 131 does not block the second conductive member 132 at the groove opening position of the second groove 1311, and the second conductive member 132 does not need to protrude from the groove opening of the second groove 1311; for example, the second conductive member 132 may be positioned flush with the surface of the first conductive member 131 facing away from the second accommodating groove 12120, or the second conductive member 132 may protrude from the surface of the first conductive member 131 facing away from the second accommodating groove 12120.

[0248] In the above technical solution, the second conductive member 132 is fitted into the first conductive member 131, which reduces the difficulty of assembling the first conductive member 131 and the second conductive member 132 and improves the fitting stability and convenience of the first conductive member 131 and the second conductive member 132. It also reduces the thickness of the first cover plate 13, reducing the space occupied by the first cover plate 13 and improving the space utilization rate of the battery cell 10. On the other hand, the second conductive member 132 can be exposed from the surface of the first conductive member 131 facing away from the second receiving groove 12120 through the opening of the second groove 1311, which is advantageous for achieving electrical connection between the second conductive member 132 and bus members outside the pole 12.

[0249] Furthermore, since the groove opening of the second groove 1311 is formed on the surface of the first conductive member 131 that is away from the second accommodating groove 12120, it is suggested that the second groove 1311 opens in the direction away from the active material application portion 21. As a result, a portion of the groove wall of the second groove 1311 of the first conductive member 131 is located between the second accommodating groove 12120 and the second conductive member 132, thereby separating the second accommodating groove 12120 and the second conductive member 132 and preventing contact between the electrolyte that has entered the second groove 1311 and the second conductive member 132, thereby reducing leakage of the electrolyte.

[0250] Of course, in other embodiments, the first cover plate 13 does not have to be a composite form made of multiple materials. For example, in other embodiments of the present application, Figure 38 is a schematic local cross-sectional view of a battery cell provided in some embodiments of the present application, and Figure 39 is an exploded structural view of the battery cell shown in Figure 38. Referring to Figures 38 and 39, the entire first cover plate 13 can also be installed in a non-composite form made of the same material, for example to fit the positive electrode pole, and the description thereof will be omitted here.

[0251] 35 to 37 again, in some embodiments, the first cover plate 13 is further fitted into the groove opening of the second accommodating groove 12120. In the above technical solution, fitting the first cover plate 13 into the second accommodating groove 12120 reduces the difficulty of assembling the first cover plate 13 and the electrode post 12, improves the assembly stability and connection reliability and convenience between the first cover plate 13 and the electrode post 12, and reduces the space occupied by the first cover plate 13 other than the electrode post 12. In addition, because the first cover plate 13 is fitted into the groove opening of the second accommodating groove 12120, the second accommodating groove 12120 has a relatively sufficient space for accommodating the conductive part 22.

[0252] Of course, in other embodiments of the present application, the method of fitting the first cover plate 13 and the pole 12 is not limited to being fitted into the second accommodating groove 12120, and the first cover plate 13 may also be directly fitted over the outside of the pole 12, that is, to facilitate fitting with the bus member of the battery 100, it may be directly fitted over the groove opening of the second accommodating groove 12120, and is not limited in this embodiment.

[0253] 35 to 37 , optionally, in the embodiment of the present application, at least a portion of the wall surface where the groove opening of the second accommodating groove 12120 of the terminal post 12 is formed is a guide slope 12126, which is used to guide the engagement between the first cover plate 13 and the groove opening of the second accommodating groove 12120. In the above technical solution, by processing the wall surface of the groove opening of the second accommodating groove 12120 into a slope having a guide function, it is possible to reduce the difficulty of assembling the first cover plate 13 and the second accommodating groove 12120 and improve the assembly efficiency of the first cover plate 13 and the second accommodating groove 12120. Furthermore, when the first cover plate 13 is welded to the guide slope 12126, the area of ​​the welded portion is increased, which improves the reliability of the welded connection between the first cover plate 13 and the terminal post 12 and also solves the problem of the collapse of the molten pool or the laser beam entering the terminal post 12 during welding.

[0254] 35 to 37, the second accommodating groove 12120 includes a first groove section 12124 and a second groove section 12125 located on the side of the first groove section 12124 closest to the pole outer end surface 123. The cross-sectional area of ​​the second groove section 12125 is larger than that of the first groove section 12124, so the second accommodating groove 12120 is formed in a stepped groove shape, and the connection position between the first groove section 12124 and the second groove section 12125 forms a stepped surface 12127. Therefore, when the first cover plate 13 is fitted into the second accommodating groove 12120, it is fitted into the second groove section 12125 and supported by the stepped surface 12127.

[0255] In the above technical solution, by configuring the second accommodating groove 12120 in the form of a stepped groove, the first cover plate 13 can be stably fitted into the groove opening position of the second accommodating groove 12120, thereby improving the connection stability between the first cover plate 13 and the pole 12; and by limiting the groove depth of the first groove step 12124, a relatively sufficient space can be provided in the second accommodating groove 12120 to accommodate the conductive part 22.

[0256] Furthermore, when the wall surface where the groove mouth of the second accommodating groove 12120 of the pole post 12 is formed is the guide slope 12126, the cross-sectional area of ​​the second groove step 12125 is set to gradually increase along the direction approaching the pole post outer end surface 123, so that the side wall of the second groove step 12125 forms the guide slope 12126, thereby facilitating processing and satisfying the guide requirements simply and effectively.

[0257] 35 to 37 again, in the embodiments of the present application, the first cover plate 13 may further be provided with stress relief grooves 133 if necessary, and the stress relief grooves 133 are located in the outer circumferential region of the first cover plate 13 to help relieve stress on the first cover plate 13. In the above technical solution, the provision of the stress relief grooves 133 on the first cover plate 13 can relieve stress generated during the processing of the first cover plate 13 itself or during the electrical connection between the first cover plate 13 and the poles 12, so as to alleviate problems such as deformation and damage caused by stress on the first cover plate 13.

[0258] Specifically, when the first cover plate 13 is fitted into the second receiving groove 12120 and welded, the stress relief groove 133 relieves stress generated during welding, improves lateral heat conduction, and reduces the possibility of damage or deformation of the first cover plate 13. At the same time, if the first cover plate 13 is a composite type including the first conductive member 131 and the second conductive member 132, the stress relief groove 133 is provided in the first conductive member 131 and located at the outer circumferential region of the second conductive member 132. Therefore, when the first conductive member 131 is fitted into the second receiving groove 12120 and welded, the stress relief groove 133 relieves stress generated during welding, improves lateral heat conduction, and reduces the possibility of damage or deformation of the second conductive member 132. In addition, when the second conductive member 132 and the first conductive member 131 are fitted and welded, the stress relief groove 133 releases the stress generated by the welding, improves the lateral conduction of heat, and reduces the probability of deformation of the first conductive member 131 or the first conductive member 131 being unable to be fitted into the second accommodating groove 12120.

[0259] Referring to Figures 38 and 39, in the embodiment of the present application, the battery cell 10 can also be equipped with a second cover plate 14 according to needs, and the second cover plate 14 is installed to cover the outside of the through hole 12130 and is also located outside the conductive portion 22 of the second accommodating groove 12120.

[0260] It should be noted that if the battery cell 10 includes the second cover plate 14, the battery cell 10 may or may not also include the first cover plate 13. 0 When the cover plate 14 includes both the second cover plate 14 and the first cover plate 13, the first cover plate 13 may be a composite type using multiple types of materials, or a non-composite type using the same material.

[0261] In the above technical solution, at least a portion of the conductive portion 22 is located in the second accommodating groove 12120, and the second cover plate 14 covers that portion of the conductive portion 22. The second cover plate 14 also covers the through hole 12130. This alleviates the problem of the electrolyte in that portion overflowing from the pole 12 when the electrolyte enters the second accommodating groove 12120 through the through hole 12130, thereby improving the reliability of the battery cell 10.

[0262] 38 and 39, when a portion of the conductive portion 22 is sandwiched between the second cover plate 14 and the second end wall 12121, laser welding can be used to weld together the three components of the portion of the conductive portion 22, the second cover plate 14, and the second end wall 12121, so as to improve the reliability of the connection between the pole post 12 and the conductive portion 22. Furthermore, because the second cover plate 14 can press the conductive portion 22, the second cover plate 14 can improve the stability with which the conductive portion 22 is accommodated in the second accommodating groove 12120.

[0263] 3 to 5, 15, 20, and 34, a battery cell 10 according to a specific embodiment of the present invention will be described.

[0264] In the present embodiment, the battery cell 10 is a rectangular parallelepiped, with the height direction of the battery cell 10 being the first direction Z, the length direction of the battery cell 10 being the second direction X, and the thickness direction of the battery cell 10 being the third direction Y. The battery cell 10 includes a casing 11, which includes a casing body 111 and a casing cover 112. The casing body 111 has a rectangular ring structure, with one end of the casing body 111 in the first direction Z being open and the other end in the first direction Z being closed, and the casing cover 112 covering the open position of the casing body 111. Two electrode posts 12 are provided at the closed end of the casing body 111 in the first direction Z, and the two electrode posts 12 are spaced apart in the second direction X and are respectively a positive electrode post and a negative electrode post.

[0265] Each of the two poles 12 has a receiving portion 121, and the receiving portion 121 includes a second receiving groove 12120. Specifically, the pole 12 includes a second end wall 12121 and a second side wall 12123. The second end wall 12121 is located on the side of the second side wall 12123 that is close to the casing cover 112. The second end wall 12121 and the second side wall 12123 surround The second end wall 12121 has a through hole 12130 formed therein, and the through hole 12130 is disposed adjacent to the second side wall 12123 of the second end wall 12121. The surface of the pole post 12 facing away from the casing cover 112 is the pole post outer end surface 123. The second end wall 12121 has a through hole 12130 formed therein, and the through hole 12130 is disposed adjacent to the second side wall 12123 of the second end wall 12121.

[0266] The battery cell 10 further includes a battery core assembly 2, a support 3, and an insulating member 4, the battery core assembly 2 including an active material application portion 21 and a conductive portion 22, the active material application portion 21 being housed in a casing 11, the support 3 being provided at one end of the active material application portion 21 and being located between the sealed end of the casing body 111 and the active material application portion 21 along the first direction Z, the support 3 having two through holes 311, the two through holes 311 being spaced apart along the second direction X.

[0267] The insulating member 4 includes a main insulating part 41, a first insulating part 42, and a second insulating part 43, and the first insulating part 42 and the second insulating part 43 are respectively installed at both ends of the main insulating part 41, the main insulating part 41 enveloping the peripheral side of the active material application part 21, the first insulating part 42 enveloping the end part of the active material application part 21 remote from the support 3, the second insulating part 43 being located on the side of the main insulating part 41 close to the support 3, and the second insulating part 43 being fitted into the wall surface of the support 3 remote from the active material application part 21, and the second insulating part 43, together with the support 3, covering the end part of the active material application part 21 close to the support 3. A portion of the conductive portion 22 extends from the through hole 311 on the support 3 and the through hole 12130 on the pole 12 into the second accommodating groove 12120 and is welded to the second end wall 12121, electrically connecting the active material application portion 21 and the pole 12 via the conductive portion 22.

[0268] In the technical solution of the embodiment of the present application, at least a portion of the insulating member 4 is connected to the wall surface of the support 3 that is remote from the battery core assembly 2. On the one hand, during the process of attaching the battery core assembly 2 with the support 3 to the casing 11, the casing 11 does not rub against the edge of the insulating member 4, nor does it rub against the connection position between the insulating member 4 and the support 3, and the connection position between the two is not easily separated during the process of inserting the battery core assembly 2 into the casing. This reduces the movement and slippage of the insulating member 4 during the process of attaching the battery core assembly 2 to the casing, improves the reliability of the connection between the insulating member 4 and the support 3, and reduces the risk of the insulating member 4 falling off. This in turn reduces the risk of corrosion of the casing 11 due to exposure of the battery core assembly 2, the risk of failure of the battery core assembly 2 itself, and the risk of leakage. At the same time, compared to connecting the insulating member 4 to the peripheral edge of the battery core assembly 2, by fitting the insulating member 4 to the support 3, the insulating member 4 is originally adjacent to four surfaces on the peripheral edge of the casing 11, and adjacent to one surface at one end of the casing 11, which significantly reduces the probability of interference with the fitting position of the insulating member 4 and the support 3, thereby further improving the reliability and stability of the insulating member 4 and improving the reliability and stability of the battery cell 10. In addition, by connecting at least a portion of the insulating member 4 to a wall surface of the support away from the battery core assembly 2, the insulating member 4 can be designed to be longer and can be applied to battery core assemblies 2 of different sizes, resulting in higher compatibility and easier manufacturability. On the other hand, after the support 3 and the battery core assembly 2 are installed in position within the casing 11, the insulating member 4 is pressed between the wall surface facing the opening 1110 of the casing main body 11 and the support 3, thereby further reducing the risk of the insulating member 4 falling off and reducing the risk of the battery core assembly 2 failing due to exposure, while at the same time reducing the risk of corrosion of the casing 11 and improving the reliability and stability of the battery cell 10.

[0269] According to some embodiments of the present application, the present application further provides a battery 100 including a battery cell 10 described in any of the above solutions.

[0270] In the above technical solution, the battery cells 10 are installed in the battery 100, and at least a portion of the insulating member 4 is connected to a wall surface of the support 3 away from the battery core assembly 2, thereby improving the reliability of the connection between the insulating member 4 and the support 3 and reducing the risk of the insulating member 4 falling off. This in turn reduces the risk of corrosion of the casing 11 due to exposure of the battery core assembly 2, reduces the failure risk of the battery core assembly 2 itself, and reduces the risk of leakage, thereby further improving the reliability and stability of the battery 100.

[0271] According to some embodiments of the present application, the present application further provides an electrical device 1000 including the battery 100 described in any of the above solutions.

[0272] In the above technical solution, the battery 100 is installed in the electric device 1000, which can improve the reliability and stability of the operation of the battery 100, and thus improve the reliability and stability of the operation of the electric device 1000. It should be understood that if the electric device 1000 is a vehicle, it is advantageous to increase the usage time of the battery 100, thereby extending the driving range of the vehicle.

[0273] The electrical device 1000 may be any of the equipment or systems described above that uses the battery 100 .

[0274] It should be noted that, unless there is a contradiction, the embodiments and features of the embodiments of the present application can be combined with each other.

[0275] The above is merely a preferred embodiment of the present application and does not limit the present application, and various modifications and variations of the present application may be made by those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the scope of the present application without departing from the spirit and principles of the present application are also included in the scope of the claims of the present application.

Claims

1. A battery cell (10), A casing (11); a battery core assembly (2); a support (3) installed at one end of the battery core assembly (2); an insulating member (4) fitted to the support (3) and covering the battery core assembly (2); Here, the battery core assembly (2), the support (3), and the insulating member (4) are all installed in the casing (11), and at least a portion of the insulating member (4) is connected to a wall surface of the support (3) that is remote from the battery core assembly (2). Battery cell (10).

2. The insulating member (4) is connected to the wall surface of the support (3) away from the battery core assembly (2) in a continuous annular manner or at intervals in an annular manner in the circumferential direction. The battery cell (10) of claim 1.

3. The insulating member (4) is hot-melt-connected to a wall surface of the support (3) that is far from the battery core assembly (2) to form a connection mark (401); The connection mark (401) extends annularly in the circumferential direction of the wall surface, or there are a plurality of the connection marks (401), and the plurality of connection marks (401) are arranged at intervals in the circumferential direction of the wall surface. The battery cell (10) of claim 2.

4. The casing (11) is provided with a pole (12), the battery core assembly (2) includes an active material application portion (21) and a conductive portion (22), the conductive portion (22) is connected to the side of the active material application portion (21) close to the support (3), extends to the pole (12), and is connected to the pole (12), and the insulating member (4) covers the active material application portion (21) together with the support (3) in the circumferential direction. The battery cell (10) of claim 1.

5. The insulating member (4) includes a main insulating portion (41), a first insulating portion (42) and a second insulating portion (43), the main insulating portion (41) enveloping the peripheral edge side of the active material application portion (21), The first insulating portion (42) and the second insulating portion (43) are respectively installed at both ends of the main insulating portion (41), the first insulating portion (42) being located on the side of the main insulating portion (41) away from the support (3) and enveloping the end of the active material applied portion (21) away from the support (3), and the second insulating portion (43) being located on the side of the main insulating portion (41) close to the support (3), being fitted to the support (3), and being used together with the support (3) to cover the end of the active material applied portion (21) close to the support (3). The battery cell (10) of claim 4.

6. The main insulating portion (41) includes a plurality of main portions (410), which are connected in series in an annular shape, and the plurality of main portions (410) jointly surround the peripheral edge side of the active material application portion (21), and the first insulating portion (42) and the second insulating portion (43) are respectively located at both ends of the annular structure formed by the plurality of main portions (410). The battery cell (10) of claim 5.

7. The connection positions of any two adjacent main body portions (410) partially overlap. The battery cell (10) of claim 6.

8. The peripheral side of the active material coating portion (21) has a plurality of surfaces, Each of the main body portions (410) includes a main body surface and two flanges provided on both sides of the main body surface, any two adjacent main body portions (410) are connected by the flanges, and the connection structure of each of the main body surface and the two flanges respectively encloses different surfaces on the peripheral side of the active material application portion (21). The battery cell (10) of claim 6.

9. The peripheral side of the active material coating portion (21) has four surfaces, The main insulating part (41) includes two main parts (410), which are a first main part (411) and a second main part (412), respectively, installed on both sides of the first insulating part (42), the first main part (411) includes a first main surface (4111) and a first flange (4112) and a second flange (4113) installed on both sides of the first main surface (4111), the second main part (412) includes a second main surface (4121) and a third flange (4122) and a fourth flange (4123) installed on both sides of the second main surface (4121), the first flange (4112) is connected to the third flange (4122), and the second flange (4113) is connected to the fourth flange (4123), The first main surface (4111), the connection structure between the first flange (4112) and the third flange (4122), and the connection structure between the second main surface (4121), the second flange (4113) and the fourth flange (4123) each enclose four surfaces arranged in sequence on the peripheral side of the active material application portion (21), The battery cell (10) of claim 8.

10. The first insulating portion (42) has a center line (42a), and the first main body portion (411) and the second main body portion (412) are located on both sides of the center line (42a) of the first insulating portion (42), respectively; The first main body portion (411) and the second main body portion (412) are symmetrically arranged with the center line (42a) as the axis of symmetry, or the first main body surface (4111) and the second main body surface (4121) are symmetrically arranged. The battery cell (10) of claim 9.

11. The second insulating portion (43) includes a plurality of sub-insulating portions (430) connected to the plurality of main portions (410) in a one-to-one correspondence; Any two adjacent sub-insulation portions (430) partially overlap each other. The battery cell (10) of claim 8.

12. Each of the sub-insulating portions (430) includes a main surface (431) and two sub-surfaces (432), the main surface (431) being connected to the main surface of the corresponding main portion (410), and the two sub-surfaces (432) being connected to the two flanges of the corresponding main portion (410), respectively; Two sub-surfaces (432) corresponding to any two adjacent flanges are connected and installed, and each sub-surface (432) is connected and installed to the adjacent main surface (431); The battery cell (10) according to claim 11.

13. The two sub-surfaces (432) corresponding to any two adjacent flanges are partially overlapped, and / or each sub-surface (432) is partially overlapped with the adjacent main surface (431). The battery cell (10) of claim 12.

14. a notch (44) at the connection between the main insulating part (41) and the first insulating part (42) and / or a notch (44) at the connection between the main insulating part (41) and the second insulating part (43); The battery cell (10) of claim 5.

15. The casing (11) is provided with a pole (12), the battery core assembly (2) includes an active material application portion (21) and a conductive portion (22), the conductive portion (22) is connected to the side of the active material application portion (21) that is close to the support (3), the support (3) has a through hole (311), and the conductive portion (22) passes through the through hole (311) and is connected to the pole (12). A battery cell (10) according to any one of claims 1 to 14.

16. The support (3) is of a unitary structure, or the support (3) is of a separate structure and includes a first support (33) and a second support (34) that are separately molded, and the through hole (311) is defined between the first support (33) and the second support (34). The battery cell (10) of claim 15.

17. A receiving groove (393) communicating with the through hole (311) is opened on the side of the support (3) away from the active material coated portion (21), and the receiving groove (393) receives at least a part of the electrode post (12). The battery cell (10) of claim 15.

18. A guide portion (32) is provided on the side of the support (3) that is away from the active material application portion (21), and the guide portion (32) surrounds the through hole (311) in the circumferential direction and extends in a direction approaching the electrode post (12). The battery cell (10) of claim 15.

19. The pole (12) is provided with a housing portion (121), at least a portion of the conductive portion (22) is housed in the housing portion (121), and at least a portion of the guide portion (32) extends within the housing portion (121) and is used to guide the conductive portion (22) to be housed in the housing portion (121).

20. The battery cell (10) of claim 18.

20. A guide groove (312) communicating with the through hole (311) is formed on the side of the support (3) facing the active material application portion (21), the guide groove (312) accommodates at least a part of the conductive portion (22), and the cross-sectional area of ​​the guide groove (312) gradually increases along a direction of the support (3) closer to the active material application portion (21). The battery cell (10) of claim 15.

21. The support (3) is provided with at least one first liquid injection guide groove (392), the first liquid injection guide groove (392) is located on the side of the support (3) facing the active material coating portion (21), and the at least one first liquid injection guide groove (392) communicates with the guide groove (312). The battery cell (10) of claim 20.

22. The support (3) has a first liquid injection guide groove (392), which is located on a side of the support (3) that is close to the battery core assembly (2), and / or the support (3) has a second liquid injection guide groove, which is located on a side of the support (3) that is farther away from the battery core assembly (2). A battery cell (10) according to any one of claims 1 to 21.

23. The support (3) has a recess (391) on the side facing the battery core assembly (2) for accommodating the outer edge of the battery core assembly (2) on the side facing the support (3). A battery cell (10) according to any one of claims 1 to 22.

24. A position limiting protrusion (38) that engages with the battery core assembly (2) is provided on one side of the support (3). A battery cell (10) according to any one of claims 1 to 23.

25. The casing (11) is provided with a pole (12), and the battery core assembly (2) includes an active material application portion (21) and a conductive portion (22), and the conductive portion (22) is connected to the side of the active material application portion (21) that is closest to the support (3), The pole (12) is provided with a housing portion (121), and at least a part of the conductive portion (22) is housed in the housing portion (121) and connected to the pole (12). A battery cell (10) according to any one of claims 1 to 24.

26. The accommodating portion (121) has a first accommodating groove (12110), and the surface of the pole (12) facing the active material coated portion (21) is the pole inner end face (122), the groove opening of the first accommodating groove (12110) is formed in the pole inner end face (122), and at least a portion of the conductive portion (22) is accommodated in the first accommodating groove (12110).

26. The battery cell (10) of claim 25.

27. The accommodating portion (121) has a second accommodating groove (12120), the surface of the pole (12) away from the active material coated portion (21) is the pole outer end face (123), the groove opening of the second accommodating groove (12120) is formed in the pole outer end face (123), the second accommodating groove (12120) communicates with the inside of the casing (11) via a through hole (12130), the conductive portion (22) is drilled in the through hole (12130), and at least a portion of the conductive portion (22) is accommodated in the second accommodating groove (12120).

26. The battery cell (10) of claim 25.

28. The casing (11) includes a casing body (111) and a casing cover (112), and the casing body (111) has an opening (1110); The number of the openings (1110) is one, the casing cover (112) covers the opening (1110), and the support (3) is located at one end of the battery core assembly (2) remote from the opening (1110), or the number of the openings (1110) is two, each of the openings (1110) is covered by one casing cover (112), and the support (3) is located at one end of the battery core assembly (2) remote from any of the openings (1110). A battery cell (10) according to any one of claims 1 to 27.

29. At least one pole 12 is provided on the casing wall of the casing (11) adjacent to the support (3). A battery cell (10) according to any one of claims 1 to 28.

30. A battery cell (10) according to any one of claims 1 to 29. Battery (100).

31. 31. A battery (100) according to claim 30, Electrical device (1000).

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