Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The battery cell comprises a housing, an electrode assembly, an electrode terminal, a first sealing member and a second sealing member. The wall part of the shell is provided with an electrode lead-out hole. The electrode terminal comprises a body part, a first connecting part and a second connecting part, the body part penetrates through the electrode leading-out hole and is connected with the first connecting part and the second connecting part, the first connecting part is located on the side, facing the electrode assembly, of the wall part and is electrically connected with the electrode assembly, and the second connecting part is located on the side, deviating from the electrode assembly, of the wall part. At least part of the first sealing piece is arranged between the first connecting part and the wall part in the thickness direction of the wall part and surrounds the body part. At least part of the second sealing piece is arranged between the second connecting part and the wall part in the thickness direction of the wall part and surrounds the body part. Therefore, the phenomenon of poor sealing or sealing failure of the electrode terminal and the wall part can be reduced, and the leakage risk of the battery monomer is reduced.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, power batteries, as the power source, play an irreplaceable and crucial role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing. Among them, battery devices, as core components of new energy vehicles, have high requirements in terms of reliability.

[0003] In battery technology, a battery cell typically includes a casing and electrode components and electrolyte housed within the casing. To enable the input or output of electrical energy into the battery cell, electrode terminals are usually provided on the casing, and these terminals are electrically connected to the electrode components. However, existing battery cells are prone to poor sealing or sealing failure between the electrode terminals and the casing during use, which can lead to leakage at the electrode terminals and thus hinder the improvement of the battery cell's reliability. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device, which can effectively improve the reliability of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, including a housing, an electrode assembly, electrode terminals, a first seal, and a second seal. The housing has a wall portion, and the wall portion is provided with an electrode lead-out hole, which penetrates the wall portion along its thickness direction. The electrode assembly is disposed within the housing. The electrode terminal includes a body portion, a first connecting portion, and a second connecting portion. The body portion passes through the electrode lead-out hole and connects the first connecting portion and the second connecting portion. At least a portion of the first connecting portion is located on the side of the wall portion facing the electrode assembly, and the first connecting portion is electrically connected to the electrode assembly. At least a portion of the second connecting portion is located on the side of the wall portion away from the electrode assembly. At least a portion of the first seal is disposed between the first connecting portion and the wall portion in the thickness direction of the wall portion, and the first seal is disposed around the body portion. At least a portion of the second seal is disposed between the second connecting portion and the wall portion in the thickness direction of the wall portion, and the second seal is disposed around the body portion.

[0006] In the above technical solution, by providing a first sealing element and a second sealing element between the first connection portion of the wall and the electrode terminal, and between the second connection portion of the wall and the electrode terminal, respectively, and both the first and second sealing elements are used to seal the gap between the body and the wall surface of the electrode lead-out hole, the battery cell with this structure can, on the one hand, enable the first and second sealing elements to play a certain buffering role between the electrode terminal and the wall, so that when the electrode terminal moves or shifts relative to the wall along the thickness direction of the wall, the rigid collision between the electrode terminal and the wall can be reduced, thereby reducing the risk of damage to the electrode terminal or the wall. Furthermore, when the outer casing expands, contracts, or vibrates, the stress transmitted to the electrode terminal can be partially absorbed by the first and second sealing elements, thereby reducing the vibration of the electrode terminal and alleviating the pulling phenomenon caused by the electrode terminal to the busbar or current collector components. On the other hand, it can achieve a buffering effect between the surfaces of both sides of the wall and the electrode. A sealing interface is formed between the terminals to achieve a double-sealed structure between the electrode terminals and the wall, which helps to improve the sealing effect between the electrode terminals and the wall. When the electrode terminals move or shift along the thickness direction of the wall after being impacted or bumped, if the electrode terminals move towards the electrode assembly, the second connecting part will press down the second sealing member towards the wall. If the electrode terminals move away from the electrode assembly, the first connecting part will press down the first sealing member towards the wall. This ensures that when the electrode terminals move or shift along the thickness direction of the wall, at least the first or second sealing member can be pressed against the wall, so that a sealing interface is formed on at least one side of the electrode terminals and the wall. This effectively reduces the phenomenon of poor sealing or sealing failure between the electrode terminals and the wall during use, thereby reducing the risk of leakage from the electrode lead hole during the use of the battery cell and improving the reliability of the battery cell.

[0007] In some embodiments, at least one of the first seal and the second seal is provided with an extension; wherein the extension extends along the thickness direction of the wall portion into the electrode lead-out hole, and the extension surrounds the outside of the body portion.

[0008] In the above technical solution, by providing an extension on at least one of the first and second seals, and the extension being a structure that extends between the body and the wall of the electrode lead-out hole and surrounds the body, the sealing effect of the first and second seals on the gap between the body and the wall of the electrode lead-out hole can be improved, thereby reducing the risk of leakage from the electrode lead-out hole during battery cell use. On the other hand, the extension can also play an insulating role between the body and the wall, thereby reducing the risk of short circuit between the body and the wall.

[0009] In some embodiments, the first seal includes a first sealing body and the extension, at least a portion of the first sealing body is disposed between the first connecting portion and the wall portion, and the extension is connected to the first sealing body; wherein, along the thickness direction of the wall portion, the extension abuts against the second seal.

[0010] In the above technical solution, the first sealing member is provided with an extension extending between the body portion and the hole wall of the electrode lead-out hole and surrounding the body portion. The extension portion is a structure that abuts against the second sealing member in the thickness direction of the wall portion. This can further improve the effect of the first sealing member and the second sealing member in separating the body portion and the hole wall of the electrode lead-out hole. On the one hand, it can further improve the effect of the first sealing member and the second sealing member in sealing the gap between the body portion and the hole wall of the electrode lead-out hole, so as to further reduce the risk of leakage from the electrode lead-out hole during the use of the battery cell. On the other hand, it can further improve the effect of the extension portion in insulating and isolating the body portion and the wall portion, so as to reduce the risk of short circuit between the body portion and the wall portion.

[0011] In some embodiments, the second seal includes a second sealing body and the extension, at least a portion of the second sealing body is disposed between the second connecting portion and the wall portion, and the extension is connected to the second sealing body; wherein, along the thickness direction of the wall portion, the extension abuts against the first seal.

[0012] In the above technical solution, the second sealing member is provided with an extension extending between the body portion and the hole wall of the electrode lead-out hole and surrounding the body portion. The extension portion is a structure that abuts against the first sealing member in the thickness direction of the wall portion. This can further improve the effect of the first sealing member and the second sealing member in separating the body portion and the hole wall of the electrode lead-out hole. On the one hand, it can further improve the effect of the first sealing member and the second sealing member in sealing the gap between the body portion and the hole wall of the electrode lead-out hole, so as to further reduce the risk of leakage from the electrode lead-out hole during the use of the battery cell. On the other hand, it can further improve the effect of the extension portion in insulating and isolating the body portion and the wall portion, so as to reduce the risk of short circuit between the body portion and the wall portion.

[0013] In some embodiments, the first seal includes a first sealing body disposed between the first connecting portion and the wall portion in the thickness direction of the wall portion, the compression amount of the first sealing body being P1, satisfying 5% ≤ P1 ≤ 50%; and / or, the second seal includes a second sealing body disposed between the second connecting portion and the wall portion in the thickness direction of the wall portion, the compression amount of the second sealing body being P2, satisfying 5% ≤ P2 ≤ 50%.

[0014] In the above technical solution, by setting the compression amount of the first sealing body between the first connecting part and the wall part of the first sealing element to 5% to 50%, on the one hand, setting the compression amount of the first sealing body to be greater than or equal to 5% makes the structure of the first sealing body of the first sealing element in a compressed state between the first connecting part and the wall part, thereby further improving the sealing effect of the gap between the sealing body of the first sealing element and the hole wall surface of the electrode lead-out hole, so as to reduce the leakage risk of the battery cell during use. On the other hand, setting the compression amount of the first sealing body to be less than or equal to 50% can alleviate the phenomenon of damage caused by excessive compression of the first sealing body, and also allows the first sealing body of the first sealing element to still have a certain compression margin, so that the first sealing element can play a better buffering role when the electrode terminal moves or shifts along the thickness direction of the wall part, thereby reducing the risk of damage to the electrode terminal or the wall part. Similarly, by setting the compression amount of the second sealing body between the second connecting part and the wall part of the second seal to 5% to 50%, on the one hand, setting the compression amount of the second sealing body to be greater than or equal to 5% makes the structure of the second sealing body of the second seal in a compressed state between the second connecting part and the wall part, thereby further improving the sealing effect of the gap between the sealing body of the second seal and the hole wall surface of the electrode lead-out hole, so as to reduce the leakage risk of the battery cell during use. On the other hand, setting the compression amount of the second sealing body to be less than or equal to 50% can alleviate the phenomenon of damage caused by excessive compression of the second sealing body, and also allows the second sealing body of the second seal to have a certain compression margin, so that the second seal can play a better buffering role when the electrode terminal moves or shifts along the thickness direction of the wall part, thereby reducing the risk of damage to the electrode terminal or the wall part.

[0015] In some embodiments, the material of the first seal includes fluororubber, hydrogenated nitrile butadiene rubber, ethylene propylene rubber, polyurethane rubber, or silicone rubber; and / or, the material of the second seal includes fluororubber, hydrogenated nitrile butadiene rubber, ethylene propylene rubber, polyurethane rubber, or silicone rubber.

[0016] In the above technical solution, by using fluororubber, hydrogenated nitrile butadiene rubber, ethylene propylene rubber, polyurethane rubber, or silicone rubber as the material of the first seal, both good compressibility and sealing performance are achieved, while also reducing the manufacturing cost of the first seal. Similarly, by using fluororubber, hydrogenated nitrile butadiene rubber, ethylene propylene rubber, polyurethane rubber, or silicone rubber as the material of the second seal, both good compressibility and sealing performance are achieved, while also reducing the manufacturing cost of the second seal.

[0017] In some embodiments, the battery cell further includes a first insulating member; at least a portion of the first insulating member is disposed between the first connecting portion and the wall portion in the thickness direction of the wall portion, and the first insulating member is provided with a first through hole through which the body portion passes along the thickness direction of the wall portion; wherein, at least a portion of the first sealing member is accommodated in the first through hole along the thickness direction of the wall portion.

[0018] In the above technical solution, a first insulating member is also provided between the wall portion and the first connecting portion, so that the first insulating member can play an insulating isolation role between the wall portion and the first connecting portion, thereby reducing the risk of short circuit between the first connecting portion and the wall portion. The first insulating member is provided with a first through hole through which the body portion of the power supply terminal passes. By setting at least a part of the first sealing member as a structure located in the first through hole, on the one hand, the first insulating member can play a certain limiting and positioning role for the first sealing member, which is conducive to improving the assembly stability of the first sealing member. On the other hand, the first sealing member and the first insulating member can share space in the thickness direction of the wall portion, which is conducive to improving the internal space utilization of the battery cell, thereby increasing the energy density of the battery cell.

[0019] In some embodiments, along the thickness direction of the wall portion, the first insulating member includes a first insulating body disposed between the first connecting portion and the wall portion, the first insulating body having a first through hole, and the first sealing member includes a first sealing body disposed between the first connecting portion and the wall portion, at least a portion of the first sealing body being accommodated within the first through hole; wherein a portion of the first sealing body and a portion of the first insulating body overlap each other in the thickness direction of the wall portion to form a first overlapping area, and the first overlapping area is disposed around the body portion.

[0020] In the above technical solution, by setting the first sealing body of the first sealing member and the first insulating body of the first insulating member to partially overlap each other in the thickness direction of the wall portion, and setting the first overlapping area formed by the overlap of the first sealing body of the first sealing member and the first insulating body of the first insulating member to an annular structure surrounding the body portion, the overlapping parts of the first sealing body and the first insulating body and the overlapping parts of the first insulating body and the first sealing body are both annular structures surrounding the body portion, thereby alleviating the phenomenon of overlap or electrical breakdown between the wall portion and the first connecting portion at the gap between the first sealing body and the first insulating body, so as to further reduce the risk of short circuit between the first connecting portion and the wall portion.

[0021] In some embodiments, the first insulating member includes a first insulating body disposed between the first connecting portion and the wall portion in the thickness direction of the wall portion; wherein, along the thickness direction of the wall portion, a first groove is provided on the surface of at least one side of the first insulating body.

[0022] In the above technical solution, by providing a first groove on at least one side of the first insulating body of the first insulating member in the thickness direction of the wall portion, the first insulating body disposed between the first connecting portion and the wall portion can still have a space to be compressed, and the difficulty of the first insulating body being compressed and deformed can be reduced. Thus, the first insulating body can also play a better buffering role between the first connecting portion and the wall portion, and can reduce the rigid contact between the electrode terminal and the wall portion. In this way, when the electrode terminal moves or shifts along the thickness direction of the wall portion, the phenomenon of stress concentration of the electrode terminal can be reduced, thereby reducing the risk of the electrode terminal being damaged.

[0023] In some embodiments, a plurality of the first grooves are provided on the surface of at least one side of the first insulating body along the thickness direction of the wall portion; wherein the plurality of the first grooves are spaced apart along a first direction and the first grooves extend along a second direction, and the thickness direction of the wall portion, the first direction and the second direction are perpendicular to each other.

[0024] In the above technical solution, by providing a plurality of first grooves arranged at intervals along a first direction on the surface of at least one side of the first insulating body, and the first grooves having a structure extending along a second direction, the difficulty of providing a plurality of first grooves on the first insulating body can be reduced, thereby reducing the molding difficulty of the first insulating component. On the other hand, the space for the first insulating body to be compressed can be further increased, and the difficulty of the first insulating body to be compressed and deformed can be further reduced, thereby further improving the buffering effect between the first insulating body and the first connecting part and the wall part, and further reducing the rigid contact between the electrode terminal and the wall part, thereby further reducing the risk of the electrode terminal being damaged.

[0025] In some embodiments, the first groove is provided on both sides of the first insulating body along the thickness direction of the wall portion.

[0026] In the above technical solution, by providing first grooves on both sides of the surface of the first insulating body, the space for the first insulating body to be compressed can be further increased, and the difficulty of the first insulating body to be compressed and deformed can be further reduced. This can further improve the buffering effect between the first insulating body and the first connecting part and the wall part, and further reduce the rigid contact between the electrode terminal and the wall part, which is beneficial to further reduce the risk of the electrode terminal being damaged.

[0027] In some embodiments, the battery cell further includes a second insulating member; at least a portion of the second insulating member is disposed between the second connecting portion and the wall portion in the thickness direction of the wall portion, and the second insulating member is provided with a second through hole through which the body portion passes along the thickness direction of the wall portion; wherein, at least a portion of the second sealing member is accommodated in the second through hole along the thickness direction of the wall portion.

[0028] In the above technical solution, a second insulating member is also provided between the wall portion and the second connecting portion, so that the second insulating member can play an insulating isolation role for the wall portion and the second connecting portion, thereby reducing the risk of short circuit between the second connecting portion and the wall portion. The second insulating member is provided with a second through hole through which the body portion of the power supply terminal passes. By setting at least a part of the second sealing member as a structure located in the second through hole, on the one hand, the second insulating member can play a certain limiting and positioning role for the second sealing member, which is conducive to improving the assembly stability of the second sealing member. On the other hand, the second sealing member and the second insulating member can share space in the thickness direction of the wall portion, which is conducive to improving the internal space utilization of the battery cell and thus improving the energy density of the battery cell.

[0029] In some embodiments, along the thickness direction of the wall portion, the second insulating member includes a second insulating body disposed between the second connecting portion and the wall portion, the second insulating body having a second through hole, and the second sealing member includes a second sealing body disposed between the second connecting portion and the wall portion, at least a portion of the second sealing body being accommodated within the second through hole; wherein a portion of the second sealing body and a portion of the second insulating body overlap each other in the thickness direction of the wall portion to form a second overlapping area, and the second overlapping area is disposed around the body portion.

[0030] In the above technical solution, by setting the second sealing body of the second seal and the second insulating body of the second insulating member to partially overlap each other in the thickness direction of the wall portion, and setting the second overlapping area formed by the overlap of the second sealing body of the second seal and the second insulating body of the second insulating member to an annular structure surrounding the body portion, the overlapping portions of the second sealing body and the second insulating body and the second sealing body are both annular structures surrounding the body portion. This can alleviate the phenomenon of overlap or electrical breakdown of the wall portion and the second connecting portion at the gap between the second sealing body and the second insulating body, thereby further reducing the risk of short circuit between the second connecting portion and the wall portion.

[0031] In some embodiments, the second insulating member includes a second insulating body disposed between the second connecting portion and the wall portion in the thickness direction of the wall portion; wherein, along the thickness direction of the wall portion, a second groove is provided on the surface of at least one side of the second insulating body.

[0032] In the above technical solution, by providing a second groove on at least one side of the second insulating body of the second insulating member in the thickness direction of the wall portion, the second insulating body disposed between the second connecting portion and the wall portion can still have a space to be compressed, and the difficulty of the second insulating body being compressed and deformed can be reduced. Thus, the second insulating body can also play a better buffering role between the second connecting portion and the wall portion, and can reduce the rigid contact between the electrode terminal and the wall portion. In this way, when the electrode terminal moves or shifts along the thickness direction of the wall portion, the phenomenon of stress concentration of the electrode terminal can be reduced, thereby reducing the risk of the electrode terminal being damaged.

[0033] In some embodiments, a plurality of second grooves are provided on the surface of at least one side of the second insulating body along the thickness direction of the wall portion; wherein the plurality of second grooves are spaced apart along a first direction and the second grooves extend along a second direction, and the thickness direction of the wall portion, the first direction and the second direction are perpendicular to each other.

[0034] In the above technical solution, by providing a plurality of second grooves arranged at intervals along the first direction on the surface of at least one side of the second insulating body, and the second grooves having a structure extending along the second direction, the difficulty of providing a plurality of second grooves on the second insulating body can be reduced, thereby reducing the molding difficulty of the second insulating component. On the other hand, the space for the second insulating body to be compressed can be further increased, and the difficulty of the second insulating body to be compressed and deformed can be further reduced, thereby further improving the buffering effect of the second insulating body between the second connecting part and the wall part, and further reducing the rigid contact between the electrode terminal and the wall part, thereby further reducing the risk of the electrode terminal being damaged.

[0035] In some embodiments, the second groove is provided on both sides of the second insulating body along the thickness direction of the wall portion.

[0036] In the above technical solution, by providing second grooves on both sides of the surface of the second insulating body, the space for the second insulating body to be compressed can be further increased, and the difficulty of the second insulating body being compressed and deformed can be further reduced. This can further improve the buffering effect of the second insulating body between the second connecting part and the wall part, and further reduce the rigid contact between the electrode terminal and the wall part, which is beneficial to further reduce the risk of the electrode terminal being damaged.

[0037] In some embodiments, the second insulating member further includes a flanged portion; the flanged portion surrounds the outside of the second connecting portion, and the flanged portion is connected to the second insulating body at one end near the electrode assembly in the thickness direction of the wall portion.

[0038] In the above technical solution, the second insulating member also has a flange portion surrounding the second connecting portion, and one end of the flange portion in the thickness direction of the wall portion is connected to the second insulating body, so that the second insulating body and the flange portion together form a groove structure for accommodating the second connecting portion. On the one hand, it can improve the insulation isolation effect of the second insulating member between the second connecting portion and the wall portion, so as to further reduce the risk of short circuit between the second connecting portion and the wall portion. On the other hand, it can improve the assembly stability between the second insulating member and the second connecting portion.

[0039] In some embodiments, the first connecting portion is integrally formed with the body portion.

[0040] In the above technical solution, by setting the first connecting part and the body part as an integrally formed structure, on the one hand, the connection stability between the first connecting part and the body part can be improved to reduce the risk of connection failure of the electrode terminals during use. On the other hand, the assembly and connection process between the first connecting part and the body part can be reduced during the assembly of the battery cell, which is conducive to optimizing the production cycle of the battery cell and improving the assembly efficiency of the battery cell.

[0041] In some embodiments, the body portion protrudes from the surface of the first connecting portion facing the wall portion along the thickness direction of the wall portion.

[0042] In the above technical solution, by setting the body part as a structure that protrudes from the surface of the first connecting part facing the wall, on the one hand, the assembly difficulty of the body part passing through the electrode lead hole can be reduced, thereby reducing the assembly difficulty of the battery cell. On the other hand, the space occupied by the first connecting part and the body part in the direction perpendicular to the thickness of the wall can be saved, which is conducive to optimizing the internal space layout of the battery cell.

[0043] In some embodiments, the body portion is riveted to the second connecting portion.

[0044] In the above technical solution, by setting the second connecting part and the body part as a structure of mutual riveting, it is beneficial to improve the connection stability between the second connecting part and the body part, so as to reduce the risk of connection failure of the electrode terminal during use, and to reduce the connection difficulty between the second connecting part and the body part, so as to improve the assembly efficiency of the battery cell.

[0045] In some embodiments, the housing includes a shell and an end cap; the interior of the shell has an opening in a receiving cavity in which the electrode assembly is received; the end cap closes the opening; wherein the end cap is the wall portion.

[0046] In the above technical solution, by setting the wall of the outer casing as an end cap for sealing the opening of the casing, the battery cell with this structure is easy to assemble electrode terminals on the end cap, and it is easy to set a first seal between the first connection between the wall and the electrode terminal and a second seal between the second connection between the wall and the electrode terminal, thereby reducing the assembly difficulty of the battery cell and improving the production efficiency of the battery cell.

[0047] In some embodiments, the housing includes a shell and an end cap; the shell includes an integrally formed sidewall and a bottom wall, the sidewall surrounding the bottom wall, one end of the sidewall being connected to the bottom wall along the thickness direction of the wall portion, and the other end forming an opening, the sidewall and the bottom wall together defining a receiving cavity, the electrode assembly being received within the receiving cavity; the end cap closes the opening; wherein, the bottom wall is the wall portion.

[0048] In the above technical solution, by setting the wall of the outer casing as a wall that is opposite to the end cover in the thickness direction of the wall, the battery cell with this structure can make the area where the electrode terminals are installed on the outer casing far away from the end cover, and make the wall and the end cover not directly connected. This can alleviate the phenomenon that the force generated when the electrode terminals and other components pull or twist the wall acts on the end cover, thereby reducing the risk of connection failure between the end cover and the casing, and thus helping to reduce the risk of leakage of the battery cell during use.

[0049] Secondly, embodiments of this application also provide a battery device, including the aforementioned battery cell.

[0050] In some embodiments, the battery device further includes a housing, in which the battery cells are disposed; wherein the housing has a first wall, which is located at the bottom of the battery cells along the thickness direction of the wall, and is configured to support the battery cells.

[0051] In the above technical solution, the battery device is further provided with a housing for accommodating the battery cells, and the housing has a first wall that supports the battery cells in the thickness direction of the wall portion, so that the arrangement direction of the battery cells and the first wall is consistent with the penetration direction of the electrode terminal body portion through the electrode lead hole. Thus, when the battery device with this structure is subjected to bottom ball impact test, the first seal and the second seal can play a certain buffering role between the electrode terminal and the wall portion, so as to reduce the rigid collision between the electrode terminal and the wall portion, which helps to reduce the risk of damage to the electrode terminal or the wall portion, and makes at least one side of the electrode terminal and the wall portion form a sealing interface, so as to reduce the phenomenon of poor sealing or sealing failure between the electrode terminal and the wall portion, which helps to reduce the risk of leakage of the battery cells from the electrode lead hole.

[0052] Thirdly, embodiments of this application also provide an electrical device, including the aforementioned battery cell or the aforementioned battery device. Attached Figure Description

[0053] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0055] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0056] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0057] Figure 4 Exploded views of the structure of a single battery cell provided in some embodiments of this application;

[0058] Figure 5 Partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0059] Figure 6 for Figure 5 A magnified view of part A of the shown battery cell;

[0060] Figure 7 for Figure 5 A magnified view of part B of the shown battery cell;

[0061] Figure 8This is a schematic diagram of the structure of the second insulating member of a battery cell provided in some embodiments of this application;

[0062] Figure 9 This is a cross-sectional view of the second insulating member of a battery cell provided in some embodiments of this application.

[0063] Icons: 1000 - Vehicle; 100 - Battery assembly; 10 - Housing; 11 - First housing body; 12 - Second housing body; 20 - Battery cell; 21 - Housing; 211 - Wall; 2111 - Electrode lead-out hole; 212 - Housing; 2121 - Opening; 213 - End cap; 22 - Electrode assembly; 221 - Tab; 23 - Electrode terminal; 231 - Body part; 232 - First connecting part; 233 - Second connecting part; 2331 - Riveting hole; 24 - First seal; 241 - First sealing body; 2411 - First sealing area; 2412 - First protrusion; 242 - Extension; 25 - ... 251-Second sealing element; 2511-Second sealing area; 2512-Third protrusion; 26-Current collector; 27-Pressure relief component; 28-First insulating element; 281-First through hole; 282-First insulating body; 2821-First insulating area; 2822-Second protrusion; 29-Second insulating element; 291-Second through hole; 292-Second insulating body; 2921-Second insulating area; 2922-Fourth protrusion; 2923-Second groove; 293-Flanged edge; 200-Controller; 300-Motor; X-Thickness direction of the wall; Y-First direction; Z-Second direction. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0065] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0066] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0067] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0068] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0069] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0070] In this application, "multiple" means two or more (including two).

[0071] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0072] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0073] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, helps prevent short circuits to some extent while allowing active ions to pass through.

[0074] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0075] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0076] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0077] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM)622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 )), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0078] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0079] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0080] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0081] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0082] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0083] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0084] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0085] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0086] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0087] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0088] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0089] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0090] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0091] In some embodiments, the solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0092] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0093] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0094] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0095] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0096] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0097] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0098] In some implementations, the electrode assembly has a stacked structure.

[0099] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0100] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0101] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0102] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0103] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0104] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0105] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0106] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0107] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0108] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0109] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0110] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0111] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0112] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0113] As an example, the enclosure may include a first enclosure body and a second enclosure body. The first enclosure body and the second enclosure body are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first enclosure body may be a top cover or a bottom plate.

[0114] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0115] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0116] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0117] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, the reliability of the battery device must also be taken into account.

[0118] For a typical battery cell, it usually includes a casing, electrode components housed within the casing, and an electrolyte. The casing also has electrode terminals, with electrode lead-out holes. Correspondingly, the electrode terminals pass through these holes and are electrically connected to the electrode components to enable the input or output of electrical energy into the battery cell. In related technologies, to mitigate the risk of leakage at the gap between the electrode terminals and the walls of the electrode lead-out holes—such as liquid or gas leakage—a sealing ring is typically installed inside the casing or within the electrode lead-out holes to seal the electrode terminals and electrodes. The gap between the hole walls of the lead-out hole is significant. However, due to the complex operating conditions of the battery cell, the electrode terminals of the battery cell are easily bumped or impacted during use or bottom ball impact tests, which may cause the electrode terminals to move or shift relative to the outer casing. This can lead to the displacement or inadequate compression of the sealing ring between the electrode terminals and the outer casing, resulting in poor sealing or sealing failure between the electrode terminals and the outer casing. As a result, there is still a risk of leakage at the gap between the electrode terminals and the hole walls of the electrode lead-out hole, which is detrimental to improving the reliability of the battery cell.

[0119] Based on the above considerations, in order to solve the problem of low reliability in the use of battery cells, this application provides a battery cell, which includes a casing, an electrode assembly, electrode terminals, a first seal, and a second seal. The casing has a wall portion, and the wall portion is provided with an electrode lead-out hole, which penetrates the wall portion along its thickness direction. The electrode assembly is disposed inside the casing. The electrode terminal includes a body portion, a first connecting portion, and a second connecting portion. The body portion passes through the electrode lead-out hole and connects the first connecting portion and the second connecting portion. At least a portion of the first connecting portion is located on the side of the wall portion facing the electrode assembly, and the first connecting portion is electrically connected to the electrode assembly. At least a portion of the second connecting portion is located on the side of the wall portion away from the electrode assembly. At least a portion of the first seal is disposed between the first connecting portion and the wall portion in the thickness direction of the wall portion, and the first seal is disposed around the body portion. At least a portion of the second seal is disposed between the second connecting portion and the wall portion in the thickness direction of the wall portion, and the second seal is disposed around the body portion.

[0120] In this type of battery cell, a first seal and a second seal are respectively provided between the first connection portion of the wall and the electrode terminal, and between the second connection portion of the wall and the electrode terminal. Both the first and second seals are used to seal the gap between the body and the wall surface of the electrode lead-out hole. This battery cell structure allows the first and second seals to act as a buffer between the electrode terminal and the wall, reducing rigid collisions when the electrode terminal moves or shifts relative to the wall along its thickness direction, thus lowering the risk of damage to the electrode terminal or wall. Furthermore, the stress transmitted to the electrode terminal during expansion, contraction, or vibration of the casing can be partially absorbed by the first and second seals, reducing vibration and mitigating the pulling effect on components such as the current collector or busbar. Additionally, it allows for the sealing of the surfaces on both sides of the wall and the... A sealing interface is formed between each electrode terminal to achieve a double-sealed structure between the electrode terminal and the wall, which helps to improve the sealing effect between the electrode terminal and the wall. When the electrode terminal moves or shifts along the thickness direction of the wall after being impacted or bumped, if the electrode terminal moves towards the electrode assembly, the second connecting part will press down the second sealing member towards the wall. If the electrode terminal moves away from the electrode assembly, the first connecting part will press down the first sealing member towards the wall. This ensures that when the electrode terminal moves or shifts along the thickness direction of the wall, it can press down at least the first or second sealing member towards the wall, so that a sealing interface is formed between the electrode terminal and at least one side of the wall. This effectively reduces the phenomenon of poor sealing or sealing failure between the electrode terminal and the wall during use, thereby reducing the risk of leakage from the electrode lead hole during the use of the battery cell and improving the reliability of the battery cell.

[0121] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using battery cells and battery devices disclosed in this application. This helps to alleviate leakage problems during battery cell use and improves the reliability of battery cell usage.

[0122] This application provides an electrical device that uses a single battery cell or battery assembly as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0123] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0124] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000; for example, the battery device 100 can serve as the operating power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0125] In some embodiments of this application, the battery device 100 can not only serve as the operating power or power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0126] Please refer to Figure 2 and Figure 3 , Figure 2 This is an exploded view of the structure of the battery device 100 provided in some embodiments of this application. Figure 3This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of this application. The battery device 100 includes a housing 10 and battery cells 20, which are housed within the housing 10.

[0127] The housing 10 provides assembly space for the battery cell 20, and can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cell 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12 so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12.

[0128] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in... Figure 2 In the middle, the shape of box 10 is a cuboid.

[0129] In the battery device 100, there can be one or more battery cells 20 disposed within the housing 10. When there are multiple battery cells 20 disposed within the housing 10, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, in parallel, or in a mixed configuration to form battery modules, and then multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10.

[0130] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for connecting multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0131] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in... Figure 3 In the middle, the battery cell 20 has a cuboid structure.

[0132] According to some embodiments of this application, refer to Figure 3 Please refer to further details. Figure 4 , Figure 5 , Figure 6 and Figure 7 , Figure 4 This is an exploded view of the structure of a battery cell 20 provided in some embodiments of this application. Figure 5 This is a partial cross-sectional view of a battery cell 20 provided in some embodiments of this application. Figure 6 for Figure 5 A magnified view of part A of the battery cell 20 shown. Figure 7 for Figure 5 The image shows a partial enlarged view of point B of the battery cell 20. This application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, electrode terminals 23, a first seal 24, and a second seal 25. The housing 21 has a wall portion 211, and the wall portion 211 is provided with an electrode lead-out hole 2111, which penetrates the wall portion 211 along the thickness direction X. The electrode assembly 22 is disposed within the housing 21. The electrode terminal 23 includes a body portion 231, a first connecting portion 232, and a second connecting portion 233. The body portion 231 passes through the electrode lead-out hole 2111 and connects the first connecting portion 232 and the second connecting portion 233. At least a portion of the first connecting portion 232 is located on the side of the wall portion 211 facing the electrode assembly 22, and the first connecting portion 232 is electrically connected to the electrode assembly 22. At least a portion of the second connecting portion 233 is located on the side of the wall portion 211 away from the electrode assembly 22. At least a portion of the first sealing member 24 is disposed between the first connecting portion 232 and the wall portion 211 in the thickness direction X of the wall portion, and the first sealing member 24 is disposed around the body portion 231. At least a portion of the second sealing member 25 is disposed between the second connecting portion 233 and the wall portion 211 in the thickness direction X of the wall portion, and the second sealing member 25 is disposed around the body portion 231.

[0133] The outer shell 21 can also be used to contain electrolytes, such as electrolyte solution. The outer shell 21 can have various structural forms, such as a cylinder or a cuboid. Similarly, the outer shell 21 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0134] In some embodiments, the housing 21 may include a housing 212 and an end cap 213. The housing 212 has an internal cavity for accommodating the electrode assembly 22 and has an opening 2121. That is, the housing 212 is a hollow structure with an opening 2121 at one end. The end cap 213 covers the opening 2121 of the housing 212 and forms a sealed connection to form a closed space for accommodating the electrode assembly 22 and the electrolyte.

[0135] The housing 212 includes a bottom wall and a side wall. The bottom wall is disposed opposite to the end cap 213. The side wall surrounds the bottom wall, and one end of the side wall is connected to the bottom wall, while the other end forms an opening 2121.

[0136] In this embodiment of the application, an electrode lead-out hole 2111 is provided on the wall portion 211 of the outer shell 21, and the electrode lead-out hole 2111 penetrates the wall portion 211 along the thickness direction X of the wall portion. That is, the electrode lead-out hole 2111 is a structure that penetrates the surface of both sides of the wall portion 211 in the thickness direction X of the wall portion, so that the electrode lead-out hole 2111 can connect the interior of the outer shell 21 and the exterior of the outer shell 21.

[0137] It should be noted that the wall portion 211 with the electrode lead-out hole 2111 can be the end cap 213 of the outer casing 21, or it can be a wall of the housing 212 of the outer casing 21. For example, in... Figure 3 and Figure 4 In this embodiment, the wall portion 211 is the end cap 213. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the wall portion 211 can also be the bottom wall of the housing 212 and the end cap 213 that are disposed opposite to each other, or the wall portion 211 can also be the side wall of the housing 212 and the end cap 213 that are adjacent to each other and connected to each other.

[0138] The housing 212 can have various shapes, such as a cylinder, cuboid, or prism. The shape of the housing 212 can be determined based on the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylinder, a cylindrical housing 212 can be used; if the electrode assembly 22 is a cuboid, a cuboid housing 212 can be used. Of course, the end cap 213 can also have various structures, such as a plate-like structure or a hollow structure open at one end. For example, in… Figure 3 and Figure 4 In the middle, the shell 212 has a cuboid structure, and the end cap 213 has a rectangular plate structure.

[0139] Of course, it is understandable that the outer casing 21 is not limited to the structure described above. The outer casing 21 can also be other structures. For example, the outer casing 21 can include a housing 212 and two end caps 213. The housing 212 is a hollow structure with openings 2121 formed on both opposite sides. One end cap 213 is fitted onto one opening 2121 of the housing 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte. That is, the housing 212 has openings 2121 formed on both opposite sides, and the two end caps 213 are fitted onto both sides of the housing 212 to close the corresponding openings 2121.

[0140] In this embodiment, the structure of the electrode assembly 22 can be various. The electrode assembly 22 can be a wound structure formed by winding a positive electrode sheet, a negative electrode sheet and an separator, or a stacked structure formed by alternatingly stacking a positive electrode sheet, a negative electrode sheet and an separator. The separator is disposed between the positive electrode sheet and the negative electrode sheet to separate the positive electrode sheet and the negative electrode sheet.

[0141] For example, the separator is a separator membrane, and the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0142] The electrode assembly 22 also has a tab 221 for electrically connecting to the first connection portion 232 of the electrode terminal 23. For example, the tab 221 is formed at one end of the electrode assembly 22 facing the wall portion 211 in the thickness direction X of the wall portion, so that the tab 221 and the electrode terminal 23 can be assembled together.

[0143] For example, the electrode assembly 22 includes two tabs 221 with opposite polarities, namely, the two tabs 221 are the positive tab and the negative tab of the electrode assembly 22, respectively. Both tabs 221 are formed at one end of the electrode assembly 22 facing the wall portion 211 in the thickness direction X of the wall portion, and the two tabs 221 are arranged at intervals along the first direction Y. In this embodiment, the thickness direction X of the wall portion, the first direction Y, and the second direction Z are perpendicular to each other. The thickness direction X of the wall portion is also the height direction of the battery cell 20, the first direction Y is also the length direction of the battery cell 20, and the second direction Z is also the thickness direction of the battery cell 20.

[0144] It should be noted that the tabs 221 of the electrode assembly 22 are either formed by stacking and connecting the regions of the positive current collector of the positive electrode sheet that are not coated with a positive active material layer, or by stacking and connecting the regions of the negative current collector of the negative electrode sheet that are not coated with a negative active material layer. If the tab 221 is the positive tab of the electrode assembly 22, then the tab 221 is formed by stacking and connecting the regions of the positive current collector of the positive electrode sheet that are not coated with a positive active material layer; if the tab 221 is the negative tab of the electrode assembly 22, then the tab 221 is formed by stacking and connecting the regions of the negative current collector of the negative electrode sheet that are not coated with a negative active material layer.

[0145] Optionally, the electrode assembly 22 housed within the housing 21 can be one or more. For example, in... Figure 4 In the case, the outer shell 21 contains two electrode assemblies 22, and the two electrode assemblies 22 are stacked along the second direction Z. Correspondingly, the second direction Z is also the thickness direction of the electrode assembly 22. Of course, in other embodiments, the electrode assembly 22 contained in the outer shell 21 can also be three, four, five or six, etc.

[0146] In this embodiment, the electrode terminal 23 is used to be electrically connected to the electrode assembly 22 to serve as the input or output of electrical energy of the battery cell 20. The battery cell 20 is provided with two electrode terminals 23, and the two electrode terminals 23 are electrically connected to two tabs 221 of opposite polarity in each electrode assembly 22.

[0147] Both electrode terminals 23 are disposed on the wall portion 211 and are arranged at intervals along the first direction Y. Correspondingly, the wall portion 211 is provided with two electrode lead-out holes 2111 arranged at intervals along the first direction Y, and a portion of each electrode terminal 23 passes through one electrode lead-out hole 2111. Of course, in other embodiments, the two electrode terminals 23 may also be disposed on different walls of the outer casing 21.

[0148] For example, the electrode terminal 23 can be made of various materials, such as copper, iron, aluminum, steel or aluminum alloy.

[0149] The main body 231 is inserted into the electrode lead-out hole 2111 and connected to the first connecting part 232 and the second connecting part 233. That is, the main body 231 of the electrode terminal 23 is a structure that is inserted into the electrode lead-out hole 2111 of the wall 211 along the thickness direction X of the wall, and the first connecting part 232 and the second connecting part 233 are connected to each other through the main body 231.

[0150] At least a portion of the first connecting portion 232 is located on the side of the wall portion 211 facing the electrode assembly 22, and the first connecting portion 232 is electrically connected to the electrode assembly 22. That is, at least a portion of the first connecting portion 232 is a structure that is housed in the housing 21 and electrically connected to the tab 221 of the electrode assembly 22, and at least a portion of the orthographic projection of the first connecting portion 232 overlaps with the orthographic projection of the wall portion 211 in the projection plane perpendicular to the thickness direction X of the wall portion.

[0151] At least a portion of the second connecting portion 233 is located on the side of the wall portion 211 away from the electrode assembly 22, that is, at least a portion of the second connecting portion 233 is a structure located on the outside of the housing 21. In the projection plane perpendicular to the thickness direction X of the wall portion, at least a portion of the orthographic projection of the second connecting portion 233 overlaps with the orthographic projection of the wall portion 211, such that at least a portion of the wall portion 211 is located between the first connecting portion 232 and the second connecting portion 233 in the thickness direction X of the wall portion, so that the first connecting portion 232 and the second connecting portion 233 can cooperate to clamp at least a portion of the wall portion 211.

[0152] Optionally, the connection structure between the main body 231 and the first connecting part 232 can be various. For example, the main body 231 and the first connecting part 232 can be connected by riveting, welding, or snap-fitting. Of course, the main body 231 and the first connecting part 232 can also be an integrally formed structure. Similarly, the connection structure between the main body 231 and the second connecting part 233 can also be various. For example, the main body 231 and the second connecting part 233 can be connected by riveting, welding, or snap-fitting. Of course, the main body 231 and the second connecting part 233 can also be an integrally formed structure.

[0153] In some embodiments, the battery cell 20 may further include two current collectors 26, both of which are disposed within the housing 21 and spaced apart. Each current collector 26 is used to connect the first connection portion 232 of an electrode terminal 23 and the tabs 221 of the same polarity in a plurality of electrode assemblies 22, so as to realize the electrical connection between the electrode terminal 23 and the electrode assembly 22, which helps to reduce the assembly difficulty between the tabs 221 and the electrode terminal 23.

[0154] For example, the current collector 26 is welded to the electrode 221. Of course, in other embodiments, the current collector 26 and the electrode 221 may also be in a structure that abuts or snaps against each other.

[0155] For example, the material of the current collector 26 can be various, such as copper, iron, aluminum, steel or aluminum alloy.

[0156] In this embodiment, the first sealing member 24 and the second sealing member 25 are both disposed between the electrode terminal 23 and the wall portion 211 to seal the gap between the electrode terminal 23 and the hole wall surface of the electrode lead-out hole 2111. It should be noted that the first sealing member 24 and the second sealing member 25 are separate structures.

[0157] For example, the material of the first seal 24 can be fluororubber, hydrogenated nitrile butadiene rubber, ethylene propylene rubber, polyurethane rubber or silicone rubber, etc. Similarly, the material of the second seal 25 can also be fluororubber, hydrogenated nitrile butadiene rubber, ethylene propylene rubber, polyurethane rubber or silicone rubber, etc.

[0158] At least a portion of the first sealing member 24 is disposed between the first connecting portion 232 and the wall portion 211 in the thickness direction X of the wall portion, and the first sealing member 24 is disposed around the body portion 231. That is, at least a portion of the first sealing member 24 is a structure that is clamped by the first connecting portion 232 and the wall portion 211, and the first sealing member 24 is an annular structure surrounding the outside of the body portion 231.

[0159] At least a portion of the second seal 25 is disposed between the second connecting portion 233 and the wall portion 211 in the thickness direction X of the wall portion, and the second seal 25 is disposed around the body portion 231. That is, at least a portion of the second seal 25 is a structure that is clamped by the second connecting portion 233 and the wall portion 211, and the second seal 25 is an annular structure that surrounds the outside of the body portion 231.

[0160] It should be noted that in the embodiment where the battery cell 20 is provided with two electrode terminals 23, the first sealing member 24 and the second sealing member 25 are both structures that correspond one-to-one with the electrode terminals 23. That is, the battery cell 20 includes two first sealing members 24 and two second sealing members 25, and each first sealing member 24 is correspondingly disposed between the first connecting portion 232 and the wall portion 211 of one electrode terminal 23, and each second sealing member 25 is correspondingly disposed between the second connecting portion 233 and the wall portion 211 of one electrode terminal 23.

[0161] In some embodiments, the battery cell 20 may further include a pressure relief component 27 disposed on the housing 21, and the pressure relief component 27 is used to release the internal pressure of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0162] Optionally, the pressure relief component 27 can be disposed on the end cap 213 of the outer casing 21 or on the housing 212 of the outer casing 21. Similarly, the pressure relief component 27 and the outer casing 21 can be integrally formed or separately disposed. If the pressure relief component 27 and the outer casing 21 are separately disposed, the pressure relief component 27 can be connected to the outer casing 21 by welding or other means. Correspondingly, the pressure relief component 27 can be a component such as an explosion-proof valve, explosion-proof disc, gas valve, pressure relief valve or safety valve. If the pressure relief component 27 and the outer casing 21 are integrally formed, the pressure relief component 27 is an area on the outer casing 21 with a weak structure, such as an area on the outer casing 21 with a groove.

[0163] In this embodiment, by providing a first sealing member 24 and a second sealing member 25 between the first connecting portion 232 of the wall portion 211 and the electrode terminal 23 and between the second connecting portion 233 of the wall portion 211 and the electrode terminal 23, respectively, and by using both the first sealing member 24 and the second sealing member 25 to seal the gap between the body portion 231 and the hole wall surface of the electrode lead-out hole 2111, the battery cell 20 with this structure can achieve a certain buffering effect between the first sealing member 24 and the second sealing member 25 and the electrode terminal 23, so that the electrode terminal 23 can be sealed. When the electrode terminal 23 moves or shifts relative to the wall 211 along the thickness direction X of the wall portion, it can reduce the rigid collision between the electrode terminal 23 and the wall portion 211, thereby reducing the risk of damage to the electrode terminal 23 or the wall portion 211. Furthermore, when the housing 21 expands, contracts, or vibrates, the stress transmitted to the electrode terminal 23 can be partially absorbed by the first seal 24 and the second seal 25, thereby reducing the vibration of the electrode terminal 23 and alleviating the pulling phenomenon caused by the electrode terminal 23 on components such as the busbar or current collector 26. On the other hand, it can achieve surface clearance on both sides of the wall portion 211. A sealing interface is formed between the electrode terminal 23 and the wall portion 211 to achieve a double-sealed structure between the electrode terminal 23 and the wall portion 211. This improves the sealing effect between the electrode terminal 23 and the wall portion 211. Furthermore, when the electrode terminal 23 moves or shifts along the thickness direction X of the wall portion after being impacted or bumped, if the electrode terminal 23 moves towards the electrode assembly 22, the second connecting portion 233 will press down on the second sealing member 25 towards the wall portion 211. If the electrode terminal 23 moves away from the electrode assembly 22, the first connecting portion 232 will press down on the second sealing member 25 towards the wall portion 211. By pressing down on the first sealing member 24, the electrode terminal 23 can be pressed towards the wall 211 at least by the first sealing member 24 or the second sealing member 25 when it moves or shifts along the thickness direction X of the wall. This ensures that a sealing interface is formed between the electrode terminal 23 and at least one side of the wall 211, thereby effectively reducing the occurrence of poor sealing or sealing failure between the electrode terminal 23 and the wall 211 during use. This reduces the risk of leakage from the electrode lead-out hole 2111 of the battery cell 20 during use and improves the reliability of the battery cell 20.

[0164] According to some embodiments of this application, see Figure 6 and Figure 7 As shown, at least one of the first seal 24 and the second seal 25 is provided with an extension 242, which extends along the thickness direction X of the wall portion into the electrode lead-out hole 2111 and surrounds the outside of the body portion 231.

[0165] In this embodiment, at least one of the first sealing member 24 and the second sealing member 25 is provided with an extension portion 242. Specifically, only the first sealing member 24 may have an extension portion 242, only the second sealing member 25 may have an extension portion 242, or both the first sealing member 24 and the second sealing member 25 may have extension portions 242. For example, in... Figure 6 and Figure 7 In this case, only the first sealing element 24 is provided with an extension 242.

[0166] The extension 242 extends along the thickness direction X of the wall portion into the electrode lead-out hole 2111, and the extension 242 surrounds the outside of the main body portion 231. That is to say, the extension 242 is also an annular structure provided around the main body portion 231, and the extension 242 is located between the outer peripheral surface of the main body portion 231 and the hole wall surface of the electrode lead-out hole 2111.

[0167] In this embodiment, by providing an extension 242 on at least one of the first seal 24 and the second seal 25, and the extension 242 having a structure that extends between the body portion 231 and the hole wall surface of the electrode lead-out hole 2111 and surrounds the body portion 231, the sealing effect of the first seal 24 and the second seal 25 between the body portion 231 and the hole wall surface of the electrode lead-out hole 2111 can be improved, thereby reducing the risk of leakage from the electrode lead-out hole 2111 during the use of the battery cell 20. On the other hand, the extension 242 can also serve as an insulating barrier between the body portion 231 and the wall portion 211, thereby reducing the risk of short circuit between the body portion 231 and the wall portion 211.

[0168] In some embodiments, please continue to see Figure 6 and Figure 7 As shown, the first sealing element 24 may include a first sealing body 241 and an extension 242. At least a portion of the first sealing body 241 is disposed between the first connecting portion 232 and the wall portion 211, and the extension 242 is connected to the first sealing body 241. Along the thickness direction X of the wall portion, the extension 242 abuts against the second sealing element 25.

[0169] The first sealing body 241 is the portion of the first sealing member 24 located between the first connecting portion 232 and the wall portion 211 in the thickness direction X of the wall portion, and the first sealing body 241 is the portion of the first sealing member 24 compressed by the first connecting portion 232 and the wall portion 211. Correspondingly, the first sealing body 241 is the portion of the first sealing member 24 mainly used to seal the gap between the electrode terminal 23 and the wall portion 211.

[0170] The extension 242 is connected to the first sealing body 241, that is, the extension 242 and the first sealing body 241 are interconnected. For example, the extension 242 protrudes from the side of the first sealing body 241 facing the wall 211 in the thickness direction X of the wall portion, and the extension 242 extends along the thickness direction X of the wall portion into the electrode lead-out hole 2111, so that the extension 242 is located between the outer peripheral surface of the body portion 231 and the hole wall surface of the electrode lead-out hole 2111.

[0171] For example, the first sealing body 241 and the extension 242 are integrally formed. Of course, in other embodiments, the first sealing body 241 and the extension 242 may also be separate and connected. Correspondingly, the extension 242 can be connected to the first sealing body 241 by adhesive connection or hot melt connection.

[0172] Along the thickness direction X of the wall portion, the extension portion 242 abuts against the second seal 25. That is, the extension portion 242 of the first seal 24 extends along the thickness direction X of the wall portion into the electrode lead-out hole 2111 and abuts against the second seal 25 to separate the body portion 231 and the hole wall surface of the electrode lead-out hole 2111.

[0173] In this embodiment, the first sealing member 24 is provided with an extension 242 extending between the body portion 231 and the hole wall surface of the electrode lead-out hole 2111 and surrounding the body portion 231. The extension 242 has a structure that abuts against the second sealing member 25 in the thickness direction X of the wall portion. This can further improve the effect of the first sealing member 24 and the second sealing member 25 in separating the body portion 231 and the hole wall surface of the electrode lead-out hole 2111. On the one hand, it can further improve the effect of the first sealing member 24 and the second sealing member 25 in sealing the gap between the body portion 231 and the hole wall surface of the electrode lead-out hole 2111, so as to further reduce the risk of leakage from the electrode lead-out hole 2111 during the use of the battery cell 20. On the other hand, it can further improve the effect of the extension 242 in insulating and isolating the body portion 231 and the wall portion 211, so as to reduce the risk of short circuit between the body portion 231 and the wall portion 211.

[0174] Of course, the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures. For example, the second sealing member 25 may include a second sealing body 251 and an extension 242. At least a portion of the second sealing body 251 is disposed between the second connecting portion 233 and the wall portion 211, and the extension 242 is connected to the second sealing body 251. Along the thickness direction X of the wall portion, the extension 242 abuts against the first sealing member 24. That is, the second sealing member 25 may also have an extension 242, and the extension 242 may extend along the thickness direction X of the wall portion into the electrode lead-out hole 2111 and abut against the second sealing member 25 to separate the body portion 231 and the hole wall surface of the electrode lead-out hole 2111.

[0175] The second sealing body 251 is the portion of the second sealing member 25 located between the second connecting portion 233 and the wall portion 211 in the thickness direction X of the wall portion, and the second sealing body 251 is the portion of the second sealing member 25 compressed by the second connecting portion 233 and the wall portion 211. Correspondingly, the second sealing body 251 is the portion of the second sealing member 25 mainly used to seal the gap between the electrode terminal 23 and the wall portion 211.

[0176] It should be noted that in the embodiment where the second sealing member 25 is provided with an extension 242, the first sealing member 24 can also be provided with an extension 242. Correspondingly, the extension 242 of the first sealing member 24 and the extension 242 of the second sealing member 25 are both structures that extend along the thickness direction X of the wall to the electrode lead-out hole 2111 and abut against each other.

[0177] It should be noted that in the embodiment where the first seal 24 does not have an extension 242, the first seal 24 is the first sealing body 241. Similarly, in the embodiment where the second seal 25 does not have an extension 242, the second seal 25 is the second sealing body 251.

[0178] For example, in the embodiments of this application, see Figure 7 As shown, the first sealing member 24 is provided with an extension 242, that is, the first sealing member 24 includes a first sealing body 241 and an extension 242. The extension 242 protrudes from the surface of the first sealing body 241 on the side facing the wall 211 in the thickness direction X of the wall. The second sealing member 25 only includes a second sealing body 251. Correspondingly, the extension 242 extends along the thickness direction X of the wall into the electrode lead-out hole 2111 and abuts against the second sealing body 251.

[0179] In this embodiment, the second sealing member 25 is provided with an extension 242 extending between the body portion 231 and the hole wall surface of the electrode lead-out hole 2111 and surrounding the body portion 231. The extension 242 has a structure that abuts against the first sealing member 24 in the thickness direction X of the wall portion, thereby further improving the effect of the first sealing member 24 and the second sealing member 25 in separating the body portion 231 and the hole wall surface of the electrode lead-out hole 2111. On the one hand, it can further improve the effect of the first sealing member 24 and the second sealing member 25 in sealing the gap between the body portion 231 and the hole wall surface of the electrode lead-out hole 2111, so as to further reduce the risk of leakage from the electrode lead-out hole 2111 during the use of the battery cell 20. On the other hand, it further improves the effect of the extension 242 in insulating and isolating the body portion 231 and the wall portion 211, so as to reduce the risk of short circuit between the body portion 231 and the wall portion 211.

[0180] According to some embodiments of this application, see Figure 6 and Figure 7 As shown, the first seal 24 may include a first sealing body 241 disposed between the first connecting part 232 and the wall part 211 in the thickness direction X of the wall part. The compression amount of the first sealing body 241 is P1, which satisfies that 5% ≤ P1 ≤ 50%.

[0181] Wherein, the first sealing body 241 is the part of the first sealing member 24 compressed by the first connecting part 232 and the wall part 211. Correspondingly, the compression amount of the first sealing body 241 is P1, that is, P1 is the compression amount of the part of the first sealing member 24 compressed by the first connecting part 232 and the wall part 211.

[0182] For example, the compression amount P1 of the first sealing body 241 can be 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, or 50%.

[0183] It should be noted that the measurement method for P1 is as follows: first, measure the thickness T1 of the first sealing body 241 when it is compressed between the first connecting part 232 and the wall part 211; then, after the battery cell 20 is disassembled after assembly and use, measure the thickness T2 of the first sealing body 241 after it has recovered its deformation; and then subtract T1 from T2 and divide by T2 to obtain the value of P1.

[0184] Of course, in the embodiments of this application, during the assembly of the first seal 24, the compression of the first sealing body 241 of the first seal 24 is greater than or equal to 15%.

[0185] For example, in the embodiments of this application, the compression rebound rate of the first seal 24 is greater than or equal to 30% and less than or equal to 80%.

[0186] In this embodiment, by setting the compression amount of the first sealing body 241, which is disposed between the first sealing member 24 and the wall portion 211, to 5% to 50%, on the one hand, setting the compression amount of the first sealing body 241 to be greater than or equal to 5% ensures that the first sealing body 241 of the first sealing member 24 is disposed in a compressed state between the first connecting portion 232 and the wall portion 211. This further improves the sealing effect of the gap between the sealing body portion 231 of the first sealing member 24 and the hole wall surface of the electrode lead-out hole 2111, thereby reducing the risk of leakage of the battery cell 20 during use. On the other hand, setting the compression amount of the first sealing body 241 to be less than or equal to 50% can alleviate the phenomenon of damage caused by excessive compression of the first sealing body 241. It also ensures that the first sealing body 241 of the first sealing member 24 still has a certain compression margin, so that the first sealing member 24 can play a better buffering role when the electrode terminal 23 moves or shifts along the thickness direction X of the wall portion, thereby reducing the risk of damage to the electrode terminal 23 or the wall portion 211.

[0187] In some embodiments, the material of the first seal 24 may include fluororubber, hydrogenated nitrile butadiene rubber, ethylene propylene rubber, polyurethane rubber, or silicone rubber.

[0188] In this embodiment, by setting the material of the first seal 24 to fluororubber, hydrogenated nitrile butadiene rubber, ethylene propylene rubber, polyurethane rubber or silicone rubber, the first seal 24 has good compression performance and good sealing effect, and can reduce the manufacturing cost of the first seal 24.

[0189] According to some embodiments of this application, see Figure 6 and Figure 7 As shown, the second seal 25 includes a second sealing body 251 disposed between the second connecting portion 233 and the wall portion 211 in the thickness direction X of the wall portion. The compression amount of the second sealing body 251 is P2, which satisfies that 5% ≤ P2 ≤ 50%.

[0190] Wherein, the second sealing body 251 is the part of the second sealing member 25 that is compressed by the second connecting part 233 and the wall part 211. Correspondingly, the compression amount of the second sealing body 251 is P2, that is, P2 is the compression amount of the part of the second sealing member 25 that is compressed by the second connecting part 233 and the wall part 211.

[0191] For example, the compression amount P2 of the second sealing body 251 can be 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, or 50%.

[0192] It should be noted that the measurement method for P2 is as follows: first, measure the thickness T3 of the second sealing body 251 when it is compressed between the second connecting part 233 and the wall part 211; then, after the battery cell 20 is disassembled after assembly and use, measure the thickness T4 of the second sealing body 251 after it has recovered its deformation; and then subtract T3 from T4 and divide by T4 to obtain the value of P2.

[0193] Of course, in this embodiment of the application, during the assembly of the second seal 25, the compression of the second sealing body 251 of the second seal 25 is greater than or equal to 15%.

[0194] For example, in the embodiments of this application, the compression rebound rate of the second seal 25 is greater than or equal to 30% and less than or equal to 80%.

[0195] It should be noted that in the embodiments of this application, the second sealing element 25 only includes the second sealing body 251, and correspondingly, the second sealing body 251 is the second sealing element 25.

[0196] In this embodiment, by setting the compression amount of the second sealing body 251, which is disposed between the second connecting portion 233 and the wall portion 211, to 5% to 50%, on the one hand, setting the compression amount of the second sealing body 251 to be greater than or equal to 5% ensures that the second sealing body 251 of the second sealing member 25 is disposed in a compressed state between the second connecting portion 233 and the wall portion 211. This further improves the sealing effect of the gap between the sealing body portion 231 of the second sealing member 25 and the hole wall surface of the electrode lead-out hole 2111, thereby reducing the risk of leakage of the battery cell 20 during use. On the other hand, setting the compression amount of the second sealing body 251 to be less than or equal to 50% can alleviate the phenomenon of damage caused by excessive compression of the second sealing body 251. It also ensures that the second sealing body 251 of the second sealing member 25 still has a certain compression margin, so that the second sealing member 25 can play a better buffering role when the electrode terminal 23 moves or shifts along the thickness direction X of the wall portion, thereby reducing the risk of damage to the electrode terminal 23 or the wall portion 211.

[0197] In some embodiments, the material of the second seal 25 includes fluororubber, hydrogenated nitrile butadiene rubber, ethylene propylene rubber, polyurethane rubber, or silicone rubber.

[0198] In this embodiment, by setting the material of the second seal 25 to fluororubber, hydrogenated nitrile butadiene rubber, ethylene propylene rubber, polyurethane rubber or silicone rubber, the second seal 25 has good compression performance and good sealing effect, and can reduce the manufacturing cost of the second seal 25.

[0199] According to some embodiments of this application, see Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the battery cell 20 may further include a first insulating member 28. At least a portion of the first insulating member 28 is disposed between the first connecting portion 232 and the wall portion 211 in the thickness direction X of the wall portion, and the first insulating member 28 is provided with a first through hole 281 through which the body portion 231 passes along the thickness direction X of the wall portion. At least a portion of the first sealing member 24 is accommodated in the first through hole 281 along the thickness direction X of the wall portion.

[0200] The first insulating member 28 is disposed between the electrode assembly 22 and the wall portion 211 in the thickness direction X of the wall portion, so as to serve to insulate and isolate the wall portion 211 and the electrode assembly 22. At least a portion of the first insulating member 28 is disposed between the first connecting portion 232 and the wall portion 211 in the thickness direction X of the wall portion, so that the first insulating member 28 can also serve to insulate and isolate the first connecting portion 232 and the wall portion 211.

[0201] For example, the first insulating member 28 is located only partially between the first connecting portion 232 and the wall portion 211.

[0202] Optionally, the first insulating element 28 can be made of various materials, such as plastic, rubber, or silicone.

[0203] The first insulating member 28 is provided with a first through hole 281 through which the body portion 231 passes along the thickness direction X of the wall portion. That is, the first through hole 281 is a structure that passes through the first insulating member 28 along the thickness direction X of the wall portion, so that the body portion 231 of the electrode terminal 23 is a structure that passes through the electrode lead-out hole 2111 and the first through hole 281 in sequence.

[0204] Along the thickness direction X of the wall portion, at least a portion of the first sealing member 24 is accommodated within the first through hole 281, that is, the first sealing member 24 is a structure in which at least a portion of the wall portion is inserted into the first through hole 281 along the thickness direction X of the wall portion.

[0205] In this embodiment, a first insulating member 28 is also provided between the wall portion 211 and the first connecting portion 232, so that the first insulating member 28 can provide insulation and isolation between the wall portion 211 and the first connecting portion 232, thereby reducing the risk of short circuit between the first connecting portion 232 and the wall portion 211. The first insulating member 28 is provided with a first through hole 281 through which the body portion 231 of the power supply terminal 23 passes. By setting at least a portion of the first sealing member 24 to be located within the first through hole 281, on the one hand, the first insulating member 28 can play a certain limiting and positioning role for the first sealing member 24, which is beneficial to improving the assembly stability of the first sealing member 24. On the other hand, the first sealing member 24 and the first insulating member 28 can share space in the thickness direction X of the wall portion, which is beneficial to improving the internal space utilization of the battery cell 20, thereby increasing the energy density of the battery cell 20.

[0206] In some embodiments, see Figure 7 As shown, along the thickness direction X of the wall portion, the first insulating member 28 includes a first insulating body 282 disposed between the first connecting portion 232 and the wall portion 211, the first insulating body 282 having a first through hole 281, and the first sealing member 24 includes a first sealing body 241 disposed between the first connecting portion 232 and the wall portion 211, at least a portion of the first sealing body 241 being accommodated within the first through hole 281. A portion of the first sealing body 241 and a portion of the first insulating body 282 overlap each other in the thickness direction X of the wall portion to form a first overlapping area, and the first overlapping area surrounds the body portion 231.

[0207] The first insulating body 282 is the main part of the first insulating member 28 located between the first connecting part 232 and the wall part 211 in the thickness direction X of the wall part, so as to separate the first connecting part 232 and the wall part 211.

[0208] The first insulating body 282 is provided with a first through hole 281, that is, the first through hole 281 of the first insulating member 28 is provided in the first insulating body 282 and penetrates the first insulating body 282.

[0209] A portion of the first sealing body 241 and a portion of the first insulating body 282 overlap each other in the thickness direction X of the wall portion to form a first overlapping area. The first overlapping area is arranged around the body portion 231. That is, the first sealing body 241 and the first insulating body 282 have overlapping areas in the thickness direction X of the wall portion, and the overlapping areas are annular structures arranged around the body portion 231. Correspondingly, this area is the first overlapping area. In other words, the overlapping portions of the first sealing body 241 and the first insulating member 28 body, as well as the overlapping portions of the first insulating member 28 body and the first sealing body 241, are all annular structures arranged around the body portion 231.

[0210] See Figure 7 As shown, the first sealing body 241 includes a first sealing area 2411 and a first protrusion 2412. The first sealing area 2411 is disposed between the first connecting portion 232 and the wall portion 211, and the first protrusion 2412 protrudes from the outer peripheral surface of the first sealing area 2411. The first insulating body 282 includes a first insulating area 2821 and a second protrusion 2822. The first insulating area 2821 is disposed between the first connecting portion 232 and the wall portion 211 and surrounds the first sealing area 2411. The second protrusion 2822 protrudes from the inner peripheral surface of the first insulating area 2821. The first protrusion 2412 and the second protrusion 2822 are stacked along the thickness direction X of the wall to form a first overlapping area, and both the first protrusion 2412 and the second protrusion 2822 are arranged around the first sealing area 2411. In the projection plane perpendicular to the thickness direction X of the wall, the orthographic projection of the outer peripheral surface of the first protrusion 2412 is located within the orthographic projection of the second protrusion 2822.

[0211] In this embodiment, by setting the first sealing body 241 of the first sealing member 24 and the first insulating body 282 of the first insulating member 28 to partially overlap each other in the thickness direction X of the wall portion, and setting the first overlapping area formed by the overlap of the first sealing body 241 of the first sealing member 24 and the first insulating body 282 of the first insulating member 28 to an annular structure surrounding the body portion 231, the overlapping portion of the first sealing body 241 and the body of the first insulating member 28 and the overlapping portion of the body of the first insulating member 28 and the first sealing body 241 are both annular structures surrounding the body portion 231. This can alleviate the phenomenon of overlap or electrical breakdown between the wall portion 211 and the first connecting portion 232 at the gap between the first sealing body 241 and the first insulating body 282, thereby further reducing the risk of short circuit between the first connecting portion 232 and the wall portion 211.

[0212] According to some embodiments of this application, see Figure 7 As shown, the first insulating member 28 includes a first insulating body 282 disposed between the first connecting portion 232 and the wall portion 211 in the thickness direction X of the wall portion. A first groove (not shown in the figure) is provided on at least one side surface of the first insulating body 282 along the thickness direction X of the wall portion.

[0213] In this design, a first groove is provided on at least one side surface of the first insulating body 282 along the thickness direction X of the wall portion. That is, the portion of the first insulating member 28 disposed between the first connecting portion 232 and the wall portion 211 may have a first groove on only one side surface along the thickness direction X of the wall portion, or it may have a first groove on both sides surface. Similarly, there may be one or more first grooves provided on one side surface of the first insulating body 282.

[0214] In this embodiment, by providing a first groove on at least one side of the first insulating body 282 of the first insulating member 28 in the thickness direction X of the wall portion, the first insulating body 282 disposed between the first connecting portion 232 and the wall portion 211 can still have a space to be compressed, and the difficulty of the first insulating body 282 being compressed and deformed can be reduced. Thus, the first insulating body 282 can also play a better buffering role between the first connecting portion 232 and the wall portion 211, and can reduce the rigid contact between the electrode terminal 23 and the wall portion 211. In this way, when the electrode terminal 23 moves or shifts along the thickness direction X of the wall portion, the phenomenon of stress concentration of the electrode terminal 23 can be reduced, thereby reducing the risk of the electrode terminal 23 being damaged.

[0215] In some embodiments, a plurality of first grooves are provided on the surface of at least one side of the first insulating body 282 along the thickness direction X of the wall portion. The plurality of first grooves are arranged at intervals along the first direction Y and extend along the second direction Z, and the thickness direction X of the wall portion, the first direction Y and the second direction Z are perpendicular to each other.

[0216] For example, the first groove is a strip-shaped groove structure extending along the second direction Z, and the plurality of first grooves located on the same side of the first insulating body 282 in the thickness direction X of the wall portion are arranged at intervals along the first direction Y.

[0217] In this embodiment, by providing a plurality of first grooves spaced apart along the first direction Y on at least one side of the surface of the first insulating body 282, and the first grooves having a structure extending along the second direction Z, the difficulty of providing a plurality of first grooves on the first insulating body 282 can be reduced, thereby reducing the molding difficulty of the first insulating member 28. On the other hand, the space for the first insulating body 282 to be compressed can be further increased, and the difficulty of the first insulating body 282 to be compressed and deformed can be further reduced. This can further improve the buffering effect of the first insulating body 282 between the first connecting portion 232 and the wall portion 211, and further reduce the rigid contact between the electrode terminal 23 and the wall portion 211, thereby further reducing the risk of damage to the electrode terminal 23.

[0218] In some embodiments, a first groove is provided on both sides of the first insulating body 282 along the thickness direction X of the wall.

[0219] In this embodiment, by providing first grooves on both sides of the surface of the first insulating body 282, the space for the first insulating body 282 to be compressed can be further increased, and the difficulty of the first insulating body 282 to be compressed and deformed can be further reduced. This can further improve the buffering effect of the first insulating body 282 between the first connecting portion 232 and the wall portion 211, and further reduce the rigid contact between the electrode terminal 23 and the wall portion 211, which is beneficial to further reduce the risk of damage to the electrode terminal 23.

[0220] According to some embodiments of this application, refer to Figure 6 and Figure 7 Please refer to further details. Figure 8 , Figure 8 This is a schematic diagram of the structure of the second insulating member 29 of the battery cell 20 provided in some embodiments of this application. The battery cell 20 may further include the second insulating member 29, at least a portion of which is disposed between the second connecting portion 233 and the wall portion 211 in the thickness direction X of the wall portion, and the second insulating member 29 is provided with a second through hole 291 through which the body portion 231 passes along the thickness direction X of the wall portion. At least a portion of the second sealing member 25 is accommodated in the second through hole 291 along the thickness direction X of the wall portion.

[0221] At least a portion of the second insulating member 29 is disposed between the second connecting portion 233 and the wall portion 211 in the thickness direction X of the wall portion, so that the second insulating member 29 can serve to insulate and isolate the second connecting portion 233 and the wall portion 211.

[0222] For example, the second insulating member 29 is located only partially between the second connecting portion 233 and the wall portion 211.

[0223] Alternatively, the material of the second insulating element 29 can be various, such as plastic, rubber or silicone.

[0224] The second insulating member 29 is provided with a second through hole 291 through which the body portion 231 passes along the thickness direction X of the wall portion. That is, the second through hole 291 is a structure that passes through the second insulating member 29 along the thickness direction X of the wall portion, so that the body portion 231 of the electrode terminal 23 is a structure that passes through the second through hole 291, the electrode lead-out hole 2111 and the first through hole 281 in sequence.

[0225] Along the thickness direction X of the wall portion, at least a portion of the second seal 25 is accommodated within the second through hole 291, that is, the second seal 25 is a structure in which at least a portion of the wall portion is inserted into the second through hole 291 in the thickness direction X of the wall portion.

[0226] In this embodiment, a second insulating member 29 is also provided between the wall portion 211 and the second connecting portion 233, so that the second insulating member 29 can provide insulation and isolation between the wall portion 211 and the second connecting portion 233, thereby reducing the risk of short circuit between the second connecting portion 233 and the wall portion 211. The second insulating member 29 is provided with a second through hole 291 through which the body portion 231 of the power supply terminal 23 passes. By setting at least a portion of the second sealing member 25 to be located within the second through hole 291, on the one hand, the second insulating member 29 can play a certain limiting and positioning role for the second sealing member 25, which is beneficial to improving the assembly stability of the second sealing member 25. On the other hand, the second sealing member 25 and the second insulating member 29 can share space in the thickness direction X of the wall portion, which is beneficial to improving the internal space utilization of the battery cell 20 and thus improving the energy density of the battery cell 20.

[0227] In some embodiments, see Figure 6 and Figure 7 As shown, along the thickness direction X of the wall portion, the second insulating member 29 includes a second insulating body 292 disposed between the second connecting portion 233 and the wall portion 211, the second insulating body 292 having a second through hole 291, and the second sealing member 25 includes a second sealing body 251 disposed between the second connecting portion 233 and the wall portion 211, at least a portion of the second sealing body 251 being accommodated within the second through hole 291. A portion of the second sealing body 251 and a portion of the second insulating body 292 overlap each other in the thickness direction X of the wall portion to form a second overlapping area, and the second overlapping area surrounds the body portion 231.

[0228] The second insulating body 292 is the main part of the second insulating member 29 located between the second connecting part 233 and the wall part 211 in the thickness direction X of the wall part, so as to separate the second connecting part 233 and the wall part 211.

[0229] The second insulating body 292 is provided with a second through hole 291, that is, the second through hole 291 of the second insulating member 29 is provided in the second insulating body 292 and penetrates the second insulating body 292.

[0230] A portion of the second sealing body 251 and a portion of the second insulating body 292 overlap each other in the thickness direction X of the wall portion to form a second overlapping area, and the second overlapping area is provided around the body portion 231. That is, the second sealing body 251 and the second insulating body 292 have overlapping areas in the thickness direction X of the wall portion, and the overlapping areas are annular structures provided around the body portion 231. Correspondingly, this area is the second overlapping area. In other words, the portion of the second sealing body 251 overlapping with the body of the second insulating member 29 and the portion of the body of the second insulating member 29 overlapping with the second sealing body 251 are both annular structures provided around the body portion 231.

[0231] See Figure 7 As shown, the second sealing body 251 includes a second sealing area 2511 and a third protrusion 2512. The second sealing area 2511 is disposed between the second connecting portion 233 and the wall portion 211, and the third protrusion 2512 protrudes from the outer peripheral surface of the second sealing area 2511. The second insulating body 292 includes a second insulating area 2921 and a fourth protrusion 2922. The second insulating area 2921 is disposed between the second connecting portion 233 and the wall portion 211 and surrounds the second sealing area 2511. The fourth protrusion 2922 protrudes from the inner peripheral surface of the second insulating area 2921. The third protrusion 2512 and the fourth protrusion 2922 are stacked along the thickness direction X of the wall and form a second overlapping area. Both the third protrusion 2512 and the fourth protrusion 2922 are arranged around the second sealing area 2511. In the projection plane perpendicular to the thickness direction X of the wall, the orthographic projection of the outer peripheral surface of the third protrusion 2512 is located in the orthographic projection of the fourth protrusion 2922.

[0232] In this embodiment, by setting the second sealing body 251 of the second sealing member 25 and the second insulating body 292 of the second insulating member 29 to partially overlap each other in the thickness direction X of the wall portion, and setting the second overlapping area formed by the overlap of the second sealing body 251 of the second sealing member 25 and the second insulating body 292 of the second insulating member 29 to an annular structure surrounding the body portion 231, the overlapping portion of the second sealing body 251 and the body of the second insulating member 29 and the overlapping portion of the body of the second insulating member 29 and the second sealing body 251 are both annular structures surrounding the body portion 231. This can alleviate the phenomenon of overlap or electrical breakdown of the wall portion 211 and the second connecting portion 233 at the gap between the second sealing body 251 and the second insulating body 292, thereby further reducing the risk of short circuit between the second connecting portion 233 and the wall portion 211.

[0233] According to some embodiments of this application, refer to Figure 7 and Figure 8 Please refer to further details. Figure 9 , Figure 9 This is a cross-sectional view of a second insulating member 29 of a battery cell 20 provided in some embodiments of this application. The second insulating member 29 includes a second insulating body 292 disposed between a second connecting portion 233 and a wall portion 211 in the thickness direction X of the wall portion. A second groove 2923 is provided on at least one side surface of the second insulating body 292 along the thickness direction X of the wall portion.

[0234] In this design, a second groove 2923 is provided on at least one side surface of the second insulating body 292 along the thickness direction X of the wall portion. That is, the portion of the second insulating member 29 disposed between the second connecting portion 233 and the wall portion 211 may have the second groove 2923 provided on only one side surface in the thickness direction X of the wall portion, or the second groove 2923 may be provided on both sides surface. Similarly, there may be one or more second grooves 2923 provided on one side surface of the second insulating body 292.

[0235] In this embodiment, by providing a second groove 2923 on at least one side of the second insulating body 292 of the second insulating member 29 in the thickness direction X of the wall portion, the second insulating body 292 disposed between the second connecting portion 233 and the wall portion 211 can still have a compressible space, and the difficulty of the second insulating body 292 being compressed and deformed can be reduced. Thus, the second insulating body 292 can also play a better buffering role between the second connecting portion 233 and the wall portion 211, and can reduce the rigid contact between the electrode terminal 23 and the wall portion 211. In this way, when the electrode terminal 23 moves or shifts along the thickness direction X of the wall portion, the phenomenon of stress concentration of the electrode terminal 23 can be reduced, thereby reducing the risk of the electrode terminal 23 being damaged.

[0236] In some embodiments, see Figure 8 and Figure 9 As shown, along the thickness direction X of the wall portion, a plurality of second grooves 2923 are provided on at least one side surface of the second insulating body 292. The plurality of second grooves 2923 are arranged at intervals along the first direction Y, and the second grooves 2923 extend along the second direction Z, with the thickness direction X of the wall portion, the first direction Y, and the second direction Z being perpendicular to each other.

[0237] For example, the second groove 2923 is a strip-shaped groove structure extending along the second direction Z, and the plurality of second grooves 2923 located on the same side of the second insulating body 292 in the thickness direction X of the wall portion are arranged at intervals along the first direction Y.

[0238] In this embodiment, by providing a plurality of second grooves 2923 arranged at intervals along the first direction Y on the surface of at least one side of the second insulating body 292, and the second grooves 2923 having a structure extending along the second direction Z, the difficulty of providing a plurality of second grooves 2923 on the second insulating body 292 can be reduced, thereby reducing the molding difficulty of the second insulating member 29. On the other hand, the space for compression of the second insulating body 292 can be further increased, and the difficulty of compression deformation of the second insulating body 292 can be further reduced. This can further improve the buffering effect of the second insulating body 292 between the second connecting portion 233 and the wall portion 211, and further reduce the rigid contact between the electrode terminal 23 and the wall portion 211, thereby further reducing the risk of damage to the electrode terminal 23.

[0239] In some embodiments, please continue to see Figure 8 and Figure 9 As shown, along the thickness direction X of the wall, a second groove 2923 is provided on both sides of the surface of the second insulating body 292.

[0240] In this embodiment, by providing second grooves 2923 on both sides of the surface of the second insulating body 292, the space for the second insulating body 292 to be compressed can be further increased, and the difficulty of the second insulating body 292 to be compressed and deformed can be further reduced. This can further improve the buffering effect of the second insulating body 292 between the second connecting portion 233 and the wall portion 211, and further reduce the rigid contact between the electrode terminal 23 and the wall portion 211, which is beneficial to further reduce the risk of damage to the electrode terminal 23.

[0241] According to some embodiments of this application, see Figure 6 , Figure 8 and Figure 9 As shown, the second insulating member 29 may also include a flange 293, which surrounds the outside of the second connecting portion 233, and the flange 293 is connected to the second insulating body 292 at one end near the electrode assembly 22 in the thickness direction X of the wall portion.

[0242] The flange 293 surrounds the outer side of the second connecting portion 233, and the end of the flange 293 near the electrode assembly 22 in the thickness direction X of the wall portion is connected to the second insulating body 292. That is, the flange 293 is an annular structure surrounding the second connecting portion 233, and the flange 293 is connected to the surface of the second insulating body 292 on the side away from the wall portion 211, so that the second insulating body 292 and the flange 293 together form a groove structure to accommodate the second connecting portion 233.

[0243] For example, the second insulating body 292 and the flanged portion 293 are integrally formed, that is, the second insulating body 292 and the flanged portion 293 of the second insulating member 29 are formed by an integral molding process, such as injection molding or extrusion molding. Of course, in other embodiments, the second insulating body 292 and the flanged portion 293 can also be separate structures, and the flanged portion 293 can be connected to the second insulating body 292 by means of adhesive or snap-fit ​​structures.

[0244] It should be noted that in some embodiments, the second insulating member 29 may not have the flange 293, that is, the second insulating member 29 may only include the second insulating body 292, and the second insulating body 292 is disposed between the second connecting part 233 and the wall part 211 in the thickness direction X of the wall part.

[0245] In this embodiment, the second insulating member 29 also has a flange 293 surrounding the second connecting portion 233, and one end of the flange 293 in the thickness direction X of the wall portion is connected to the second insulating body 292, so that the second insulating body 292 and the flange 293 together form a groove structure for accommodating the second connecting portion 233. On the one hand, this can improve the insulation isolation effect of the second insulating member 29 between the second connecting portion 233 and the wall portion 211, so as to further reduce the risk of short circuit between the second connecting portion 233 and the wall portion 211. On the other hand, it can improve the assembly stability between the second insulating member 29 and the second connecting portion 233.

[0246] According to some embodiments of this application, see Figure 4 , Figure 6 and Figure 7 As shown, the first connecting portion 232 and the body portion 231 are integrally formed. That is, the first connecting portion 232 and the body portion 231 of the electrode terminal 23 are structures manufactured by an integral forming process, such as casting, stamping or milling.

[0247] Of course, in other embodiments, the battery cell 20 can also have other structures, such as the first connecting portion 232 and the body portion 231 being separately arranged. That is, the first connecting portion 232 and the body portion 231 of the electrode terminal 23 are two independent components, and the first connecting portion 232 and the body portion 231 are connected to each other.

[0248] In this embodiment, by setting the first connecting part 232 and the body part 231 as an integrally formed structure, on the one hand, the connection stability between the first connecting part 232 and the body part 231 can be improved, thereby reducing the risk of connection failure of the electrode terminal 23 during use. On the other hand, the assembly and connection process between the first connecting part 232 and the body part 231 can be reduced during the assembly process of the battery cell 20, which is conducive to optimizing the production cycle of the battery cell 20 and improving the assembly efficiency of the battery cell 20.

[0249] In some embodiments, please continue to see Figure 4 , Figure 6 and Figure 7 As shown, along the thickness direction X of the wall portion, the main body portion 231 protrudes from the surface of the first connecting portion 232 facing the wall portion 211. That is, the main body portion 231 and the first connecting portion 232 are arranged along the thickness direction X of the wall portion, and the end of the main body portion 231 near the first connecting portion 232 is connected to the surface of the first connecting portion 232 facing the wall portion 211.

[0250] For example, in the projection plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the body portion 231 is located within the orthographic projection of the first connecting portion 232.

[0251] In this embodiment, by setting the body portion 231 to a structure that protrudes from the surface of the first connecting portion 232 facing the wall portion 211, the assembly difficulty of the body portion 231 passing through the electrode lead-out hole 2111 can be reduced, thereby reducing the assembly difficulty of the battery cell 20. On the other hand, the space occupied by the first connecting portion 232 and the body portion 231 in the direction perpendicular to the thickness direction X of the wall portion can be saved, which is beneficial to optimizing the internal space layout of the battery cell 20.

[0252] According to some embodiments of this application, see Figure 4 and Figure 6 As shown, the main body 231 is riveted to the second connecting part 233.

[0253] For example, the second connecting part 233 is provided with a riveting hole 2331, which penetrates the surfaces of both sides of the second connecting part 233 along the thickness direction X of the wall. Correspondingly, the main body part 231 is inserted into the riveting hole 2331 and riveted to the second connecting part 233.

[0254] It should be noted that in other embodiments, the main body 231 and the second connecting part 233 may also be connected to each other by welding or snap-fitting structures.

[0255] In this embodiment, by setting the second connecting part 233 and the body part 231 as a riveted structure, it is beneficial to improve the connection stability between the second connecting part 233 and the body part 231, thereby reducing the risk of connection failure of the electrode terminal 23 during use, and also to reduce the connection difficulty between the second connecting part 233 and the body part 231, thereby improving the assembly efficiency of the battery cell 20.

[0256] According to some embodiments of this application, see Figure 3 and Figure 4As shown, the housing 21 may include a housing 212 and an end cap 213. The housing 212 has an internal cavity with an opening 2121, in which the electrode assembly 22 is housed. The end cap 213 closes the opening 2121 and is a wall portion 211.

[0257] The end cap 213 is a wall portion 211, that is, the electrode lead-out hole 2111 is provided on the end cap 213. Correspondingly, the electrode terminal 23 is installed on the end cap 213, and the first sealing member 24 is provided between the end cap 213 and the first connecting portion 232 of the electrode terminal 23, and the second sealing member 25 is provided between the end cap 213 and the second connecting portion 233 of the electrode terminal 23.

[0258] In this embodiment, by setting the wall portion 211 of the outer casing 21 as an end cap 213 for closing the opening 2121 of the housing 212, the battery cell 20 with this structure is convenient to assemble the electrode terminal 23 on the end cap 213, and it is convenient to provide a first seal 24 between the wall portion 211 and the first connection portion 232 of the electrode terminal 23 and to provide a second seal 25 between the wall portion 211 and the second connection portion 233 of the electrode terminal 23, thereby reducing the assembly difficulty of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0259] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures. For example, the housing 21 can include a shell 212 and an end cap 213. The shell 212 includes an integrally formed side wall and a bottom wall. The side wall surrounds the bottom wall. Along the thickness direction X of the wall portion, one end of the side wall is connected to the bottom wall, and the other end forms an opening 2121. The side wall and the bottom wall together define a receiving cavity. The electrode assembly 22 is received in the receiving cavity. The end cap 213 closes the opening 2121. The bottom wall is the wall portion 211. That is, the electrode lead hole 2111 is provided on the bottom wall of the shell 212, which is opposite to the end cap 213 in the thickness direction X of the wall portion. Correspondingly, the electrode terminal 23 is installed on the bottom wall of the shell 212, and the first sealing member 24 is provided between the bottom wall of the shell 212 and the first connecting portion 232 of the electrode terminal 23, and the second sealing member 25 is provided between the bottom wall of the shell 212 and the second connecting portion 233 of the electrode terminal 23.

[0260] The shell 212 includes integrally formed side walls and bottom walls. In other words, the shell 212 is manufactured using an integral forming process, such as stamping, casting or extrusion molding. That is to say, the side walls and bottom walls of the shell 212 are an integral structure.

[0261] In this embodiment, by setting the wall portion 211 of the outer casing 21 as a wall of the casing 212 that is opposite to the end cap 213 in the thickness direction X of the wall portion, the battery cell 20 with this structure can make the area of ​​the outer casing 21 where the electrode terminals 23 are installed far away from the end cap 213, and make it so that there is no direct connection between the wall portion 211 and the end cap 213. This can alleviate the phenomenon that the force generated when the electrode terminals 23 and other components pull or twist the wall portion 211 acts on the end cap 213, thereby reducing the risk of connection failure between the end cap 213 and the casing 212, and thus helping to reduce the risk of leakage of the battery cell 20 during use.

[0262] According to some embodiments of this application, this application also provides a battery device 100, which includes a battery cell 20 of any of the above schemes.

[0263] Among them, see Figure 2 As shown, the battery device 100 may also include a housing 10, in which the battery cells 20 are housed.

[0264] In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, the first housing body 11 and the second housing body 12 covering each other, the first housing body 11 and the second housing body 12 together defining an assembly space for accommodating the battery cell 20.

[0265] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12 so that the first box body 11 and the second box body 12 together define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0266] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder or a cuboid. For example, in... Figure 2 In the middle, box 10 has a rectangular structure.

[0267] Optionally, the battery cell 20 disposed within the housing 10 can be one or more. For example, in... Figure 2In the battery device 100, multiple battery cells 20 are arranged inside the housing 10. The multiple battery cells 20 can be connected in series, parallel, or in a mixed manner. A mixed connection means that the multiple battery cells 20 are connected in both series and parallel. The multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of the multiple battery cells 20 is housed in the housing 10. Of course, the battery device 100 can also be formed by first connecting multiple battery cells 20 in series, parallel, or in a mixed manner to form a battery module, and then connecting multiple battery modules in series, parallel, or in a mixed manner to form a whole assembly, which is also housed in the housing 10.

[0268] The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component that connects multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0269] It should be noted that in some embodiments, the battery device 100 may not have a housing 10. The battery device 100 includes multiple battery cells 20, and the battery device 100 composed of multiple battery cells 20 can be directly mounted onto the electrical device to provide power to the electrical device through the multiple battery cells 20. That is, the housing 10 can be part of the electrical device. Taking a vehicle 1000 as an example, the housing 10 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 10 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0270] In some embodiments, see Figure 2 As shown, the battery device 100 also includes a housing 10, in which the battery cell 20 is disposed. The housing 10 has a first wall, which is located at the bottom of the battery cell 20 along the thickness direction X, and is configured to support the battery cell 20.

[0271] Along the thickness direction X of the wall portion, the first wall is located at the bottom of the battery cell 20 and is configured to support the battery cell 20. That is, the battery cell 20 is a structure placed on the first wall along the thickness direction X of the wall portion, and the first wall is located below the battery cell 20 in the direction of gravity or approximately the direction of gravity. Correspondingly, the first wall can support the battery cell 20. In other words, the thickness direction X of the wall portion is the direction of gravity or approximately the direction of gravity, and the thickness direction X of the wall portion is consistent with the thickness direction of the first wall. Correspondingly, the thickness direction X of the wall portion is also the direction in which the first box body 11 and the second box body 12 of the housing 10 cover each other.

[0272] Optionally, the wall portion 211 of the housing 21 with the electrode terminal 23 may be a structure in which the wall portion faces the first wall in the thickness direction X, or the electrode terminal 23 may be a structure in which the housing 21 is located at the end of the wall portion away from the first wall in the thickness direction X.

[0273] In this embodiment, the battery device 100 is further provided with a housing 10 for accommodating the battery cell 20, and the housing 10 has a first wall that supports the battery cell 20 in the thickness direction X of the wall portion, such that the arrangement direction of the battery cell 20 and the first wall is consistent with the insertion direction of the body portion 231 of the electrode terminal 23 through the electrode lead-out hole 2111. Therefore, when the battery device 100 with this structure is subjected to a bottom ball impact test, the first seal 24 and the second seal 25 can play a certain buffering role between the electrode terminal 23 and the wall portion 211, so as to reduce the rigid collision between the electrode terminal 23 and the wall portion 211, which helps to reduce the risk of damage to the electrode terminal 23 or the wall portion 211, and makes at least one side of the electrode terminal 23 and the wall portion 211 form a sealing interface, so as to reduce the phenomenon of poor sealing or sealing failure between the electrode terminal 23 and the wall portion 211, which helps to reduce the risk of leakage of the battery cell 20 from the electrode lead-out hole 2111.

[0274] According to some embodiments of this application, this application also provides an electrical device, which includes a battery cell 20 or a battery device 100 of any of the above schemes, and the battery cell 20 or the battery device 100 is used to provide electrical energy to the electrical device.

[0275] The electrical device can be any of the aforementioned devices or systems that use a single battery cell 20 or a battery device 100.

[0276] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0277] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The outer casing has a wall portion, wherein the wall portion is provided with an electrode lead-out hole, the electrode lead-out hole penetrating the wall portion along the thickness direction of the wall portion; Electrode assembly, disposed within the housing; An electrode terminal includes a body portion, a first connecting portion, and a second connecting portion. The body portion passes through the electrode lead-out hole and connects the first connecting portion and the second connecting portion. At least a portion of the first connecting portion is located on the side of the wall portion facing the electrode assembly, and the first connecting portion is electrically connected to the electrode assembly. At least a portion of the second connecting portion is located on the side of the wall portion away from the electrode assembly. A first seal is disposed at least partially between the first connecting portion and the wall portion in the thickness direction of the wall portion, and the first seal is disposed around the body portion; as well as The second seal is disposed at least partially between the second connection portion and the wall portion in the thickness direction of the wall portion, and the second seal is disposed around the body portion.

2. The battery cell according to claim 1, characterized in that, At least one of the first seal and the second seal is provided with an extension; The extension extends along the thickness direction of the wall portion into the electrode lead-out hole, and the extension surrounds the outer side of the body portion.

3. The battery cell according to claim 2, characterized in that, The first sealing element includes a first sealing body and the extension, at least a portion of the first sealing body is disposed between the first connecting portion and the wall portion, and the extension is connected to the first sealing body; Wherein, along the thickness direction of the wall portion, the extension abuts against the second seal.

4. The battery cell according to claim 2, characterized in that, The second seal includes a second sealing body and the extension, at least a portion of the second sealing body is disposed between the second connecting portion and the wall portion, and the extension is connected to the second sealing body; Wherein, along the thickness direction of the wall portion, the extension abuts against the first sealing member.

5. The battery cell according to claim 1, characterized in that, The first seal includes a first sealing body disposed between the first connecting portion and the wall portion in the thickness direction of the wall portion, the compression amount of the first sealing body being P1, satisfying 5% ≤ P1 ≤ 50%; and / or The second seal includes a second sealing body disposed between the second connecting portion and the wall portion in the thickness direction of the wall portion, and the compression amount of the second sealing body is P2, which satisfies 5% ≤ P2 ≤ 50%.

6. The battery cell according to claim 1, characterized in that, The material of the first seal includes fluororubber, hydrogenated nitrile butadiene rubber, ethylene propylene rubber, polyurethane rubber, or silicone rubber; and / or The material of the second seal includes fluororubber, hydrogenated nitrile butadiene rubber, ethylene propylene rubber, polyurethane rubber, or silicone rubber.

7. The battery cell according to any one of claims 1-6, characterized in that, The battery cell also includes: A first insulating member is disposed at least partially between the first connecting portion and the wall portion in the thickness direction of the wall portion, and the first insulating member is provided with a first through hole through which the body portion passes along the thickness direction of the wall portion; Wherein, at least a portion of the first seal is accommodated within the first through hole along the thickness direction of the wall portion.

8. The battery cell according to claim 7, characterized in that, Along the thickness direction of the wall portion, the first insulating member includes a first insulating body disposed between the first connecting portion and the wall portion, the first insulating body being provided with the first through hole, and the first sealing member includes a first sealing body disposed between the first connecting portion and the wall portion, at least a portion of the first sealing body being accommodated within the first through hole; Wherein, a portion of the first sealing body and a portion of the first insulating body overlap each other in the thickness direction of the wall portion to form a first overlapping area, and the first overlapping area is disposed around the body portion.

9. The battery cell according to claim 7, characterized in that, The first insulating member includes a first insulating body disposed between the first connecting portion and the wall portion in the thickness direction of the wall portion; Wherein, along the thickness direction of the wall portion, a first groove is provided on the surface of at least one side of the first insulating body.

10. The battery cell according to claim 9, characterized in that, Along the thickness direction of the wall portion, a plurality of the first grooves are provided on at least one side surface of the first insulating body; The plurality of the first grooves are arranged at intervals along the first direction, and the first grooves extend along the second direction. The thickness direction of the wall portion, the first direction, and the second direction are perpendicular to each other.

11. The battery cell according to claim 9, characterized in that, Along the thickness direction of the wall portion, the first groove is provided on both sides of the surface of the first insulating body.

12. The battery cell according to any one of claims 1-6, characterized in that, The battery cell also includes: The second insulating member is at least partially disposed between the second connecting portion and the wall portion in the thickness direction of the wall portion, and the second insulating member is provided with a second through hole through which the body portion passes along the thickness direction of the wall portion; Wherein, at least a portion of the second seal is accommodated within the second through hole along the thickness direction of the wall portion.

13. The battery cell according to claim 12, characterized in that, Along the thickness direction of the wall portion, the second insulating member includes a second insulating body disposed between the second connecting portion and the wall portion, the second insulating body being provided with a second through hole, and the second sealing member includes a second sealing body disposed between the second connecting portion and the wall portion, at least a portion of the second sealing body being accommodated within the second through hole; The portion of the second sealing body and the portion of the second insulating body overlap each other in the thickness direction of the wall portion to form a second overlapping area, and the second overlapping area surrounds the body portion.

14. The battery cell according to claim 12, characterized in that, The second insulating member includes a second insulating body disposed between the second connecting portion and the wall portion in the thickness direction of the wall portion; Wherein, along the thickness direction of the wall portion, a second groove is provided on the surface of at least one side of the second insulating body.

15. The battery cell according to claim 14, characterized in that, Along the thickness direction of the wall portion, a plurality of second grooves are provided on at least one side surface of the second insulating body; The second grooves are arranged at intervals along the first direction and extend along the second direction. The thickness direction of the wall, the first direction, and the second direction are perpendicular to each other.

16. The battery cell according to claim 14, characterized in that, Along the thickness direction of the wall portion, the second groove is provided on both sides of the surface of the second insulating body.

17. The battery cell according to claim 14, characterized in that, The second insulating element also includes: A flanged portion surrounds the outside of the second connecting portion, and the flanged portion is connected to the second insulating body at one end near the electrode assembly in the thickness direction of the wall portion.

18. The battery cell according to any one of claims 1-6, characterized in that, The first connecting part is integrally formed with the main body part.

19. The battery cell according to claim 18, characterized in that, Along the thickness direction of the wall portion, the body portion protrudes from the surface of the first connecting portion facing the wall portion.

20. The battery cell according to any one of claims 1-6, characterized in that, The main body is riveted to the second connecting part.

21. The battery cell according to any one of claims 1-6, characterized in that, The outer casing includes: The housing has an internally formed receiving cavity with an opening, and the electrode assembly is received within the receiving cavity; End cap, to close the opening; The end cap is the wall portion.

22. The battery cell according to any one of claims 1-6, characterized in that, The outer casing includes: The housing includes an integrally formed sidewall and a bottom wall. The sidewall surrounds the bottom wall. Along the thickness direction of the wall portion, one end of the sidewall is connected to the bottom wall, and the other end forms an opening. The sidewall and the bottom wall together define a receiving cavity, in which the electrode assembly is received. End cap, to close the opening; The bottom wall is the wall portion.

23. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-22.

24. The battery device according to claim 23, characterized in that, The battery device also includes a housing, and the individual battery cells are disposed within the housing; The housing has a first wall, which is located at the bottom of the battery cell along the thickness direction of the wall and is configured to support the battery cell.

25. An electrical appliance, characterized in that, Includes the battery cell as described in any one of claims 1-22; or The battery device as described in claim 23 or 24.

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