Protective cover plate

Abstract

The utility model relates to a protective cover plate, belongs to the technical field of batteries, and is used for protecting an end cover when the end cover of a single battery is welded with a shell. The protective cover plate comprises a body, the body is provided with a first surface along the thickness direction of the body, and the first surface is provided with a first groove for avoiding the first electrode terminal of the battery monomer; wherein a first convex part is arranged on the inner circumferential wall of the first groove. According to the protective cover plate, the outer surface of the end cover and the electrode terminal of the battery monomer can be effectively protected, the charge and discharge yield of the battery monomer can be improved, and the stability and reliability of the battery are further improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a protective cover. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] During the battery manufacturing process, how to improve the stability and reliability of the battery is a technical problem that needs to be solved urgently in battery technology. Utility Model Content

[0004] The purpose of the present application is to provide a protective cover plate to address the above-mentioned problems, which can effectively improve the stability and reliability of charging and discharging of battery cells.

[0005] In the first aspect, the present application provides a protective cover plate for protecting the end cover of a battery cell when the end cover is welded to a shell, comprising a main body, wherein along the thickness direction of the main body, the main body has a first surface, and the first surface has a first groove for avoiding a first electrode terminal of the battery cell; wherein a first protrusion is provided on the inner peripheral wall of the first groove.

[0006] In the technical solution of the embodiment of the present application, the first protrusion is protruding from the inner peripheral wall of the first groove, and the first protrusion and the inner peripheral wall of the first groove jointly define an escape space for accommodating the first electrode terminal. When in use, the openings of the first surface and the first groove are both facing the battery cell, so that the first groove is aligned with the first electrode terminal of the battery cell, and the body is buckled on the end cover in the direction close to the battery cell. After the body is completely buckled on the end cover, the first electrode terminal is accommodated in the escape space, and the welded part of the end cover and the shell is exposed outside the protective cover plate. The protective cover plate protects the first electrode terminal and can protect the first electrode terminal from being burned and corroded by metal spatter during welding.

[0007] Since the first convex portion protrudes from the inner circumferential wall of the first groove, that is, the projection of the first convex portion relative to the inner circumferential wall of the first groove falls on the inner circumferential wall of the first groove, and the projection area of ​​the first convex portion is smaller, when the main body is slightly tilted relative to the first electrode terminal, part of the inner circumferential wall of the first groove and the first convex portion will contact the first electrode terminal, and in the process of continuing to buckle the cover, a certain cutting friction will be generated between the protective cover plate and the first electrode terminal. However, compared with the large-area contact between the inner circumferential wall and the first electrode terminal directly, the part where the first convex portion is located can effectively reduce the contact area between the protective cover plate and the first electrode terminal, effectively reducing the range of wiredrawing on the surface of the first electrode terminal caused by wear and scratches on the protective cover plate and the first electrode terminal, reducing the severity of wiredrawing on the first electrode terminal, thereby further improving the charge and discharge yield of the battery cell, and thereby improving the stability and reliability of the battery.

[0008] The protective cover plate can be used in the end cover welding process of a battery cell having only a first electrode terminal. During the welding process of the end cover and the shell, at least a portion of the surface of the first electrode terminal is effectively protected by the first protrusion. Compared with the solution in the related art in which the surface of the first electrode terminal is worn and wiredrawing, which affects the charging and discharging performance of the battery cell, the protective cover plate provided by the present solution effectively improves the charging and discharging performance of the first electrode terminal.

[0009] It should be noted that the first protrusion is a structure that protrudes from the inner circumferential wall of the first groove. The first protrusion will not completely cover the inner circumferential wall of the first groove. The size of the part of the first protrusion connected to the first groove will be smaller than the size of the inner circumferential wall of the first groove, that is, the width and / or length will be smaller than the corresponding size of the inner circumferential wall of the first groove, and the length corresponds to the circumferential size of the inner circumferential wall of the first groove.

[0010] In some embodiments, there may be multiple first protrusions, and the multiple first protrusions may be arranged at intervals along the circumferential direction of the inner circumferential wall of the first groove to achieve multi-point protection. When the protective cover is slightly tilted, the first electrode terminal simultaneously contacts multiple first protrusions instead of directly contacting the inner circumferential wall of the first groove, thereby further reducing the contact area between the protective cover and the first electrode terminal, effectively reducing the coverage of the wiredrawing on the surface of the first electrode terminal and reducing the severity of the wiredrawing on the first electrode terminal.

[0011] In some embodiments, the main body and the first protrusion are an integral structure.

[0012] In the technical solution of the embodiment of the present application, the first convex portion is integrally formed on the inner peripheral wall of the first groove of the body, and when the first convex portion is in contact with the first electrode terminal and subjected to force, the relative position of the first convex portion and the body is fixed, that is, the first convex portion will not move relative to the body. The body and the first convex portion are an integral structure, which simplifies the structure of the protective cover plate and facilitates the production of the protective cover plate.

[0013] It should be noted that, in some embodiments, the buckling scheme of the protective cover can be set so that the protective cover can be adaptively fine-tuned in angle and position after the protective cover contacts the first electrode terminal and is subjected to force during the buckling process. During the buckling process of the protective cover, if it is slightly skewed and contacts the first convex part, under the action of the first convex part, the protective cover can gradually adjust to a posture aligned with the first electrode terminal, further reducing the wear and damage of the first convex part and the inner peripheral wall of the first groove to the first electrode terminal. In other words, when the first electrode terminal and the protective cover interact with each other, the end cap and the electrode assembly can adaptively fine-tune their positions to achieve the technical effect of reducing the wear of the first electrode terminal, which will not be elaborated at this time.

[0014] In some embodiments, along the thickness direction of the body, the first protrusion includes a connected guide surface and a positioning surface, the guide surface is closer to the opening of the first groove than the positioning surface, and the guide surface is inclined relative to the positioning surface;

[0015] Wherein, from the end of the guide surface far from the positioning surface to the end close to the positioning surface, the dimension of the guide surface protruding from the inner peripheral wall of the first groove gradually increases.

[0016] In the technical solution of the embodiment of the present application, along the thickness direction of the body, the first convex portion includes a connected guide surface and a positioning surface, and the guide surface and the positioning surface are at least part of the surface of the first convex portion facing the internal cavity of the first groove. The guide surface and the inner peripheral wall of the first groove enclose a guide cavity, and the positioning surface and the inner peripheral wall of the first groove enclose a positioning cavity.

[0017] The guide surface is closer to the opening of the first groove than the positioning surface, that is, along the direction from the opening of the first groove to the internal chamber of the first groove, the guide surface is closer to the opening of the first groove, and the positioning surface is closer to the bottom of the first groove. After the protective cover is buckled into place, the top of the first electrode terminal extends into the positioning cavity surrounded by the positioning surface and the inner circumferential wall of the first groove. The peripheral surface of the top of the first electrode terminal may contact with at least one of the positioning surface and the inner circumferential wall of the first groove, or may not contact with the positioning surface and the inner circumferential wall of the first groove.

[0018] The guide surface is inclined relative to the positioning surface, that is, there is a certain angle between the guide surface and the positioning surface. And from the end of the guide surface away from the positioning surface to the end close to the positioning surface, the size of the guide surface protruding from the inner peripheral wall of the first groove gradually increases, that is, the size of the guide cavity surrounded by the guide surface and the inner peripheral wall of the first groove will be larger than the size of the positioning cavity surrounded by the positioning surface and the inner peripheral wall of the first groove. The existence of the guide surface can reserve a certain margin for the protective cover plate to allow the first groove and the first electrode terminal to quickly align and cooperate, which can not only effectively reduce the occurrence of severe wear and scratches on the protective cover plate and the first electrode terminal, but also improve the pick-up and placement speed of the protective cover body to a certain extent, thereby improving the efficiency of the step of sealing and welding the end cover and the shell.

[0019] In some embodiments, the guide surface is a first arc-shaped surface protruding toward the inner cavity of the first groove, and the positioning surface is a second arc-shaped surface protruding toward the inner cavity of the first groove.

[0020] In the technical solution of the embodiment of the present application, the guide surface is configured as a first curved surface protruding toward the internal cavity of the first groove, and the positioning surface is configured as a second curved surface protruding toward the internal cavity of the first groove. The first curved surface and the second curved surface both have a certain curvature and are smooth curved surfaces, which have a certain buffering effect, can effectively reduce the wear of the guide surface and the positioning surface on the surface of the first electrode terminal, and reduce the large-area wiredrawing of the first electrode terminal caused by the cutting force along the thickness direction of the body.

[0021] In some embodiments, the orthographic projection of the axis of the first arc-shaped surface on the inner circumferential wall of the first groove is parallel to the thickness direction of the body, and the axis of the second arc-shaped surface is parallel to the thickness direction of the body.

[0022] In the technical solution of the embodiment of the present application, the "orthographic projection of the axis of the first arc-shaped surface on the inner peripheral wall" here refers to the projection component of the axis of the first arc-shaped surface projected on the inner peripheral wall of the first groove when the observer observes in a direction perpendicular to the inner peripheral wall of the first groove. Since the orthographic projection of the axis of the first arc-shaped surface on the inner peripheral wall of the first groove is parallel to the thickness direction of the body, the extension direction of the first arc-shaped surface is approximately the thickness direction of the body, and the first arc-shaped surface has a certain angle with the thickness direction of the body. In other words, the axis of the first arc-shaped surface does not have a projection component projected on the circumferential direction of the inner peripheral wall of the first groove.

[0023] The axis of the second arcuate surface is parallel to the thickness direction of the body, the second arcuate surface extends along the thickness direction of the body, and the axis of the second arcuate surface also has no projection component projected onto the circumferential direction of the inner circumferential wall of the first groove.

[0024] By ensuring that neither the axis of the first arcuate surface nor the axis of the second arcuate surface has a projection component projected onto the circumferential direction of the inner circumferential wall of the first groove, both the guide surface and the positioning surface can be used for point contact with the first electrode terminal. This is different from the surface contact and line contact solutions in the related art, and can greatly reduce the wear of the protective cover on the first electrode terminal, and can significantly improve the wire drawing condition on the surface of the first electrode terminal.

[0025] It should be noted that, in some embodiments, the first arcuate surface and the second arcuate surface can be set as axisymmetric surfaces, that is, the first arcuate surface is a symmetrical structure with the generatrix of the inner circumferential wall of the first groove being the symmetry axis. Similarly, the second arcuate surface can be a symmetrical structure with the generatrix of the inner circumferential wall of the first groove being the symmetry axis.

[0026] In some embodiments, a generatrix where the first arcuate surface is most protruding from the inner circumferential wall of the first groove and a generatrix where the second arcuate surface is most protruding from the inner circumferential wall of the first groove may be arranged to be coplanar.

[0027] In some embodiments, the first protrusion further includes a transition surface, and the guide surface and the positioning surface are transitioned through a transition surface arc.

[0028] In the technical solution of the embodiment of the present application, since there is a certain angle between the guide surface and the positioning surface, a transition surface is set to smoothly connect the guide surface and the positioning surface, and the sharp angle between the guide surface and the positioning surface is removed by an arc transition, so that the first protrusion can further smoothly contact the first electrode terminal, thereby reducing the wear and tear of the first electrode terminal, thereby improving the charging and discharging performance, reliability and stability of the battery.

[0029] In some embodiments, the inner peripheral wall of the first groove includes two first walls arranged opposite to each other along a first direction, each first wall is provided with a first protrusion, and the first direction is perpendicular to the thickness direction of the body.

[0030] In the technical solution of the embodiment of the present application, the two first walls are arranged opposite to each other in the first direction, and only one first convex portion is arranged on each first wall, so that when the protective cover is slightly tilted in the first direction, the two first walls will not directly contact the first electrode terminal, but the two first convex portions arranged opposite to each other along the first direction respectively contact the side surfaces of the first electrode terminal. On the one hand, the two first convex portions cooperate with each other in the first direction, which can better limit the positioning of the protective cover and the first electrode terminal. On the other hand, in the first direction, the protective cover contacts the first electrode terminal only through the two first convex portions, which effectively reduces the area range where the protective cover may contact the first electrode terminal, and can reduce the wear and drawing of the side surfaces of the first electrode terminal corresponding to the position of the first wall.

[0031] In addition, in this scheme, when the first protrusion is constructed as a structure that can make point contact with the first electrode terminal, along the first direction, the two first protrusions respectively arranged on the two first walls only point contact the first electrode terminal, which significantly reduces the cutting force that the first electrode terminal may be subjected to, so that the first electrode terminal has only slight wire drawing or even no wire drawing at the point contact part, effectively ensuring the reliability and stability of charging and discharging of the battery cell.

[0032] In some embodiments, the inner circumferential wall of the first groove further includes two second walls opposite to each other along a second direction, at least one of the two second walls is provided with a second protrusion, and the first direction, the second direction and the thickness direction of the body are perpendicular to each other.

[0033] In the technical solution of the embodiment of the present application, one of the first direction and the second direction is the length direction of the body, and the other corresponds to the width direction of the body. The two ends of the first wall are respectively connected to the two second walls, and the two first walls and the two second walls together form the inner peripheral wall of the first groove.

[0034] The second protrusion has the same function as the first protrusion, and is protruding from the inner peripheral wall of the first groove. The first protrusion, the second protrusion and the inner peripheral wall of the first groove jointly define an escape space for accommodating the first electrode terminal.

[0035] Since the second protrusion protrudes from the inner circumferential wall of the first groove, that is, the projection of the second protrusion relative to the inner circumferential wall of the first groove falls on the inner circumferential wall of the first groove, and the projection area of ​​the second protrusion is smaller, when the main body is slightly tilted relative to the first electrode terminal, part of the inner circumferential wall of the first groove and the second protrusion will contact the first electrode terminal, and in the process of continuing to buckle the cover, a certain cutting friction will be generated between the protective cover plate and the first electrode terminal. However, compared with the direct large-area contact between the inner circumferential wall and the first electrode terminal, the part where the second protrusion is located can effectively reduce the contact area between the protective cover plate and the first electrode terminal.

[0036] When both the first protrusion and the second protrusion can contact the first electrode terminal, the contact area between the first protrusion and the first electrode terminal is smaller than that between the first wall and the first electrode terminal, and the contact area between the second protrusion and the first electrode terminal is also smaller than that between the second wall and the first electrode terminal, thereby effectively reducing the range of wiredrawing on the surface of the first electrode terminal caused by wear and scratches on the protective cover plate and the first electrode terminal, reducing the severity of wiredrawing on the first electrode terminal, and further improving the stability and reliability of charging and discharging of the battery cell.

[0037] In some embodiments, for a battery cell having only a first electrode terminal, a first protrusion may be provided on each first wall, and a second protrusion may be provided on each second wall, so as to fully limit and position the first electrode terminal in the circumferential direction.

[0038] In some embodiments, the second protrusion is substantially the same in structure as the first protrusion, and the second protrusion may also be constructed as a structure in point contact with the first electrode terminal. The outer surface of the second protrusion facing the internal cavity of the first groove also includes a connected guide surface and a positioning surface. The relative position and specific structure of the guide surface and the positioning surface may refer to the above-mentioned description of the first protrusion, and will not be repeated here.

[0039] It should be noted that the two first protrusions can be staggered or arranged opposite to each other in the first direction. Similarly, the two second protrusions can be staggered or arranged opposite to each other in the second direction.

[0040] In some embodiments, the first surface has a second groove for avoiding the second electrode terminal of the battery cell, and the second groove is spaced apart from the first groove in the second direction;

[0041] Wherein, along the first direction, the second groove includes two opposite third walls, and at least one of the two third walls is provided with a third protrusion.

[0042] In the technical solution of the embodiment of the present application, for a battery cell having a first electrode terminal and a second electrode terminal, in order to protect the second electrode terminal and reduce the impact of the welding process on the performance of the second electrode terminal, a second groove is provided to avoid the second electrode terminal, and at the same time, the first groove avoids the first electrode terminal. After the body is completely buckled on the end cover, the first electrode terminal is accommodated in the first groove, and the second electrode terminal is accommodated in the second groove. The protective cover plate protects the first electrode terminal and the second electrode terminal, and can protect the first electrode terminal and the second electrode terminal from being burned and corroded by metal spatter during welding.

[0043] The third protrusion has the same function as the first protrusion, and is protruded from the third wall. That is to say, the projection of the third protrusion relative to the third wall falls on the third wall, and the projection area of ​​the third protrusion is smaller. When the main body is slightly tilted relative to the first electrode terminal and the second electrode terminal, part of the inner circumferential wall of the first groove and the first protrusion will contact the first electrode terminal, and at the same time, part of the third wall and the third protrusion will contact the second electrode terminal. In the process of continuing to buckle the cover, a certain cutting friction will be generated between the protective cover plate and the first electrode terminal and the second electrode terminal. However, compared with the inner circumferential wall of the first groove and the third wall directly contacting the first electrode terminal and the second electrode terminal with a large area respectively, the part where the first protrusion and the third protrusion are located can effectively reduce the contact area between the protective cover plate and the first electrode terminal and the second electrode terminal, and effectively reduce the range of surface drawing of the first electrode terminal and the first electrode terminal caused by wear and scratches on the protective cover plate and the first electrode terminal and the second electrode terminal, thereby further improving the stability and reliability of charging and discharging of the battery cell.

[0044] The third protrusion and the third wall together define an internal escape space of the second groove for accommodating the second electrode terminal.

[0045] It should be noted that the third protrusion is a structure protruding from the third wall. The third protrusion will not completely cover the third wall. The size of the part of the third protrusion connected to the third wall will be smaller than the size of the third wall, that is, the width and / or length will be smaller than the corresponding size of the third wall, and the length corresponds to the circumferential size of the inner wall of the second groove.

[0046] In some embodiments, there may be multiple third protrusions, and the multiple third protrusions may be arranged at intervals along the circumference of the third wall to achieve multi-point protection. When the protective cover is slightly tilted, the second electrode terminal simultaneously contacts multiple third protrusions instead of directly contacting the third wall, thereby further reducing the contact area between the protective cover and the second electrode terminal, effectively reducing the coverage of the wiredrawing on the surface of the second electrode terminal and reducing the severity of the wiredrawing on the second electrode terminal.

[0047] Similar to the structure of the first groove and the first protrusion, the undetailed structures of the second groove and the third protrusion can refer to the above structural description of the first protrusion. For example, in some embodiments, the main body and the first protrusion are an integral structure; for another example, in some embodiments, the first protrusion includes a connected guide surface and a positioning surface; for another example, in some embodiments, the guide surface is a first arcuate surface protruding toward the internal cavity of the first groove, and the positioning surface is a second arcuate surface protruding toward the internal cavity of the first groove, etc., which will not be repeated here.

[0048] The sizes of the first protrusion and the third protrusion may be slightly different, and may be adaptively adjusted according to the structure and size of the corresponding battery cell.

[0049] In some embodiments, each of the two third walls is provided with a third protrusion.

[0050] In the technical solution of the embodiment of the present application, the two third walls are arranged opposite to each other in the first direction, and only one third protrusion is arranged on each third wall, so that when the protective cover is slightly tilted in the first direction, the two third walls will not directly contact the second electrode terminal, but the two third protrusions arranged opposite to each other along the first direction respectively contact the sides of the second electrode terminal. On the one hand, the two third protrusions cooperate with each other in the first direction, which can better limit the positioning of the protective cover and the second electrode terminal. On the other hand, in the first direction, the protective cover contacts the second electrode terminal only through the two third protrusions, which effectively reduces the area range where the protective cover may contact the second electrode terminal, and can reduce the wear and drawing of the sides of the second electrode terminal corresponding to the position of the third wall.

[0051] In addition, in this scheme, when the third protrusion is constructed as a structure that can make point contact with the second electrode terminal, along the first direction, the two third protrusions respectively arranged on the two third walls only point contact the second electrode terminal, which significantly reduces the cutting force that the second electrode terminal may be subjected to, so that the second electrode terminal has only slight wire drawing or even no wire drawing at the point contact part, effectively ensuring the reliability and stability of charging and discharging of the battery cell.

[0052] In some embodiments, along the second direction, the second groove further includes two opposite fourth walls, and a fourth protrusion is disposed on at least one of the two fourth walls.

[0053] In the technical solution of the embodiment of the present application, one of the first direction and the second direction is the length direction of the body, and the other corresponds to the width direction of the body. The two ends of the third wall are respectively connected to the two fourth walls, and the two third walls and the two fourth walls together form the inner peripheral wall of the second groove.

[0054] The fourth protrusion has the same function as the first protrusion and the third protrusion. The fourth protrusion is protruding from the fourth wall. The third protrusion, the fourth protrusion, the third wall and the fourth wall together define an escape space for accommodating the second electrode terminal.

[0055] Regarding the structure and function of the fourth protrusion, reference may be made to the above description of the first protrusion and / or the third protrusion, which will not be elaborated here.

[0056] In some embodiments, the second protrusion and the fourth protrusion are each one, and along the second direction, the second protrusion is arranged on one of the two second walls close to the second groove, and the fourth protrusion is arranged on one of the two fourth walls close to the first groove, and the second direction is the length direction of the body.

[0057] In the technical solution of the embodiment of the present application, the second direction is the length direction of the body. Corresponding to the structure of the battery cell, the first electrode terminal and the second electrode terminal are often spaced apart along the second direction. By respectively arranging the second protrusion and the fourth protrusion in the second direction close to the second wall of the second groove and the fourth wall of the first groove, it is used to position and contact the two end faces of the first electrode terminal and the second electrode terminal that are close to each other in the second direction. That is, the protective cover plate can be applied to the welding protection of multiple or multiple specifications of battery cells with the same minimum spacing between the first electrode terminal and the second electrode terminal in the second direction, so that the protective cover plate can be used universally within a certain range, which is beneficial to controlling production costs, facilitating optimization of production rhythm, and improving battery production efficiency to a certain extent.

[0058] In some embodiments, the second protrusion and the fourth protrusion are each one, and along the second direction, the second protrusion is arranged on one of the two second walls away from the second groove, and the fourth protrusion is arranged on one of the two fourth walls away from the first groove, and the second direction is the length direction of the body.

[0059] In the technical solution of the embodiment of the present application, the second direction is the length direction of the main body. Corresponding to the structure of the battery cell, the first electrode terminal and the second electrode terminal are often spaced apart along the second direction. The second convex portion and the fourth convex portion are respectively arranged on the second wall away from the second groove and the fourth wall away from the first groove, so as to position and contact the two end faces of the first electrode terminal and the second electrode terminal which are opposite to each other in the second direction. That is, the protective cover plate can be applied to the welding protection of multiple or multiple specifications of battery cells whose maximum spacing between the first electrode terminal and the second electrode terminal in the second direction is consistent, so that the protective cover plate can be used universally within a certain range, which is beneficial to control production costs, facilitate optimization of production rhythm, and improve battery production efficiency to a certain extent.

[0060] In addition, since the sizes of the first electrode terminal and the second electrode terminal of some battery cells are different, the end surfaces of the first electrode terminal and the second electrode terminal that are far away from each other are symmetrical on the center of the end cover, which makes the end surfaces of the first electrode terminal and the second electrode terminal that are close to each other asymmetrical on the end cover. At this time, since the second protrusion and the fourth protrusion act on the end surfaces of the first electrode terminal and the second electrode terminal that are far away from each other, the battery cell can still correspond to the second protrusion and the fourth protrusion after rotating 180° with the height direction as the axis. In other words, the front and back of the battery cell when it is incoming will not affect the subsequent buckling of the protective cover and the positioning of the first electrode terminal and the second electrode terminal. The two electrode terminals of the battery cell do not need to distinguish between the first electrode terminal and the second electrode terminal, and the first groove can be used to cooperate with either of the two electrode terminals.

[0061] On the other hand, since the sizes of the first electrode terminal and the second electrode terminal of some battery cells may be different, the maximum distance between the first electrode terminal and the second electrode terminal in the second direction of different battery cells may be designed to be the same, but the minimum distance between the first electrode terminal and the second electrode terminal in the second direction may be designed to be different. In this case, since the second protrusion and the fourth protrusion act on the end surfaces of the first electrode terminal and the second electrode terminal that are away from each other, as long as the maximum distance between the first electrode terminal and the second electrode terminal in the second direction is the same, the same protective cover plate can be used to protect the welding process.

[0062] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0064] Figure 1 A schematic diagram of the three-dimensional structure of a protective cover provided in some embodiments of the present application.

[0065] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the protective cover from another perspective.

[0066] Figure 3 for Figure 1 A schematic diagram of the three-dimensional structure of the protective cover from another perspective.

[0067] Figure 4 for Figure 1 Top view of the protective cover in .

[0068] Figure 5 for Figure 4 AA section view of the protective cover.

[0069] Figure 6 for Figure 4 BB cross-sectional view of the protective cover.

[0070] Icon: 100-protective cover;

[0071] 10-body; 11-first surface; 12-first groove; 121-first wall; 122-second wall; 13-second groove; 131-third wall; 132-fourth wall; 14-third groove; 15-second surface; 16-weight-reducing blind hole; 17-pin hole; 18-guide slope;

[0072] 20 - first convex portion; 21 - guide surface; 22 - positioning surface; 23 - transition surface; 30 - second convex portion; 40 - third convex portion; 50 - fourth convex portion. DETAILED DESCRIPTION

[0073] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0074] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0075] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0076] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0077] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0078] The term "multiple" as used in the present application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0079] In this application, the battery mentioned herein refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack, etc.

[0080] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0081] In battery manufacturing, during the welding process of the end cap and the shell of the battery cell, since the output terminal on the battery cell is very close to the part to be welded, conventional welding methods will cause the welded metal material to sputter onto the output terminal and the end cap, thereby causing damage to the end cap and the output terminal, etc., which may eventually affect the overall performance of the battery. Therefore, protective tooling is generally provided to protect the non-welded part of the end cap and the output terminal of the battery cell before welding. However, in the related art, since the protective tooling is buckled crookedly on the end cap, the protective tooling will generate obvious longitudinal cutting force during the contact with the output terminal, resulting in wire drawing and wear on the outer surface of the output terminal, which ultimately leads to poor battery charging and discharging.

[0082] Based on the above considerations, in order to improve the stability and reliability of the battery, a protective cover plate is designed to protect the end cover when the end cover of the battery cell is welded to the shell, including a main body, along the thickness direction of the main body, the main body has a first surface, the first surface has a first groove for avoiding the first electrode terminal of the battery cell; wherein, a first convex portion is provided on the inner peripheral wall of the first groove.

[0083] In the technical solution of the embodiment of the present application, the first protrusion is protruding from the inner peripheral wall of the first groove, and the first protrusion and the inner peripheral wall of the first groove jointly define an escape space for accommodating the first electrode terminal. When in use, the openings of the first surface and the first groove are both facing the battery cell, so that the first groove is aligned with the first electrode terminal of the battery cell, and the body is buckled on the end cover in the direction close to the battery cell. After the body is completely buckled on the end cover, the first electrode terminal is accommodated in the escape space, and the welded part of the end cover and the shell is exposed outside the protective cover plate. The protective cover plate protects the first electrode terminal and can protect the first electrode terminal from being burned and corroded by metal spatter during welding.

[0084] Since the first convex portion protrudes from the inner circumferential wall of the first groove, that is, the projection of the first convex portion relative to the inner circumferential wall of the first groove falls on the inner circumferential wall of the first groove, and the projection area of ​​the first convex portion is smaller, when the main body is slightly tilted relative to the first electrode terminal, part of the inner circumferential wall of the first groove and the first convex portion will contact the first electrode terminal, and in the process of continuing to buckle the cover, a certain cutting friction will be generated between the protective cover plate and the first electrode terminal. However, compared with the large-area contact between the inner circumferential wall and the first electrode terminal directly, the part where the first convex portion is located can effectively reduce the contact area between the protective cover plate and the first electrode terminal, effectively reducing the range of wiredrawing on the surface of the first electrode terminal caused by wear and scratches on the protective cover plate and the first electrode terminal, reducing the severity of wiredrawing on the first electrode terminal, and further improving the stability and reliability of charging and discharging of the battery cell.

[0085] The protective cover plate can be used in the end cover welding process of a battery cell having only a first electrode terminal. During the welding process of the end cover and the shell, at least a portion of the surface of the first electrode terminal is effectively protected by the first protrusion. Compared with the solution in the related art in which the surface of the first electrode terminal is worn and wiredrawing, which affects the charging and discharging performance of the battery cell, the protective cover plate provided by the present solution effectively improves the charging and discharging performance of the first electrode terminal.

[0086] The protective cover plate disclosed in the embodiment of the present application can be used for, but is not limited to, protection during the welding process between the end cap and the shell of a battery cell. When the protective cover plate is used for a battery cell, it can effectively improve the stability and reliability of the battery cell and the battery.

[0087] Generally, a battery includes a case and a battery cell, and the battery cell is contained in the case. The case is used to provide a storage space for the battery cell, and the case can adopt a variety of structures. In some embodiments, the case may include a first part and a second part, the first part and the second part cover each other, and the first part and the second part jointly define a storage space for accommodating the battery cell. The second part may be a hollow structure with one end open, and the first part may be a plate-like structure, and the first part covers the open side of the second part, so that the first part and the second part jointly define a storage space; the first part and the second part may also be hollow structures with one side open, and the open side of the first part covers the open side of the second part. Of course, the case formed by the first part and the second part can be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0088] In a battery, there can be multiple battery cells, which can be connected in series, in parallel, or in a mixed connection. A mixed connection means that multiple battery cells are connected in series and in parallel. Multiple battery cells can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by multiple battery cells is accommodated in a box; of course, the battery can also be a battery module formed by connecting multiple battery cells in series, in parallel, or in a mixed connection, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in a box. The battery can also include other structures. For example, the battery can also include a busbar component for realizing electrical connection between multiple battery cells.

[0089] Each battery cell may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell may be cylindrical, flat, rectangular, or in other shapes.

[0090] The battery cell may include an outer shell, an electrode assembly and an electrode terminal. The outer shell includes a shell and an end cap, the shell has an opening, and the end cap closes the opening to isolate the internal environment of the battery cell from the external environment.

[0091] The shell is a component used to cooperate with the end cap to form the internal environment of the battery cell, wherein the formed internal environment can be used to accommodate the electrode assembly, electrolyte and other components. The shell and the end cap can be independent components. The shell can be of various shapes and sizes. Specifically, the shape of the shell can be determined according to the specific shape and size of the electrode assembly. The shell can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0092] The end cap refers to a component that covers the opening of the shell to isolate the internal environment of the battery cell from the external environment. Without limitation, the shape of the end cap can be adapted to the shape of the shell to match the shell. Optionally, the end cap can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap is not easily deformed when squeezed and collided, so that the battery cell can have a higher structural strength and reliability can also be improved. Functional components such as electrode terminals can be provided on the end cap. The electrode terminal can be used to electrically connect to the electrode assembly for output or input of electrical energy of the battery cell. The material of the end cap can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose special restrictions on this. In some embodiments, an insulating structure can also be provided on the inner side of the end cap, and the insulating structure can be used to isolate the electrical connection components in the shell from the end cap to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0093] The electrode assembly is the part where the electrochemical reaction occurs in the battery cell. One or more electrode assemblies may be contained in the housing. The electrode assembly is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet, which is used to separate the positive electrode sheet and the negative electrode sheet to avoid internal short circuit of the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the pole ear. The positive pole ear and the negative pole ear may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the pole ears connect the electrode terminals to form a current loop.

[0094] In some embodiments, the battery cell may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell reaches a threshold value.

[0095] According to some embodiments of the present application, Figure 1 to Figure 3 As shown, the present application provides a protective cover plate 100 for protecting the end cover of a battery cell when the end cover is welded to the shell.

[0096] The protective cover 100 includes a body 10 . The body 10 has a first surface 11 along the thickness direction of the body 10 . The first surface 11 has a first groove 12 for accommodating the first electrode terminal of the battery cell. A first convex portion 20 is provided on the inner peripheral wall of the first groove 12 .

[0097] The body 10 is a basic physical structure of the protective cover 100 , so that the protective cover 100 can have a certain thickness and structural strength.

[0098] like Figure 1 As shown, the thickness direction of the body 10 is the Z direction.

[0099] The first groove 12 is a blind groove sunk in the first surface 11 of the body 10 , and can receive the first electrode terminal.

[0100] The first protrusion 20 is a structure protruding from the inner circumferential wall of the first groove 12. The first protrusion 20 will not completely cover the inner circumferential wall of the first groove 12. The size of the portion of the first protrusion 20 connected to the first groove 12 will be smaller than the size of the inner circumferential wall of the first groove 12, that is, the width and / or length will be smaller than the corresponding size of the inner circumferential wall of the first groove 12, and the length corresponds to the circumferential size of the inner circumferential wall of the first groove 12.

[0101] In the above technical solution, the first protrusion 20 is protruding from the inner peripheral wall of the first groove 12, and the first protrusion 20 and the inner peripheral wall of the first groove 12 jointly define an escape space for accommodating the first electrode terminal. When in use, the openings of the first surface 11 and the first groove 12 are both facing the battery cell, so that the first groove 12 is aligned with the first electrode terminal of the battery cell, and the body 10 is buckled on the end cover in the direction close to the battery cell. After the body 10 is completely buckled on the end cover, the first electrode terminal is accommodated in the escape space, and the welded part of the end cover and the shell is exposed outside the protective cover plate 100. The protective cover plate 100 protects the first electrode terminal and can protect the first electrode terminal from being burned and corroded by metal spatter during welding.

[0102] Since the first protrusion 20 protrudes from the inner circumferential wall of the first groove 12, that is, the projection of the first protrusion 20 relative to the inner circumferential wall of the first groove 12 falls on the inner circumferential wall of the first groove 12, and the projection area of ​​the first protrusion 20 is smaller, when the main body 10 is slightly tilted relative to the first electrode terminal, part of the inner circumferential wall of the first groove 12 and the first protrusion 20 will contact the first electrode terminal, and in the process of continuing to buckle the cover, a certain cutting friction will be generated between the protective cover plate 100 and the first electrode terminal. However, compared with the direct large-area contact between the inner circumferential wall and the first electrode terminal, the part where the first protrusion 20 is located can effectively reduce the contact area between the protective cover plate 100 and the first electrode terminal, effectively reduce the range of wiredrawing on the surface of the first electrode terminal caused by wear and scratches on the protective cover plate 100 and the first electrode terminal, reduce the severity of wiredrawing of the first electrode terminal, and further improve the stability and reliability of charging and discharging of the battery cell.

[0103] The protective cover plate 100 can be used in the end cover welding process of a battery cell having only a first electrode terminal. During the welding process of the end cover and the shell, at least a portion of the surface of the first electrode terminal is effectively protected by the first protrusion 20. Compared with the solution in the related art in which the surface of the first electrode terminal is worn and wiredrawing occurs, which affects the charging and discharging performance of the battery cell, the protective cover plate 100 provided in this solution effectively improves the charging and discharging performance of the first electrode terminal.

[0104] In some embodiments, there may be multiple first protrusions 20, and the multiple first protrusions 20 may be arranged at intervals along the circumferential direction of the inner circumferential wall of the first groove 12 to achieve multi-point protection. When the protective cover 100 is slightly tilted, the first electrode terminal contacts one or at least two first protrusions 20 at the same time, but does not directly contact the inner circumferential wall of the first groove 12, thereby further reducing the contact area between the protective cover 100 and the first electrode terminal, which can effectively reduce the coverage of the wire drawing on the surface of the first electrode terminal and reduce the severity of the wire drawing of the first electrode terminal.

[0105] According to some embodiments of the present application, along the circumference of the inner circumferential wall of the first groove 12, the extension range of the first protrusion 20 does not completely cover the inner circumferential wall of the first groove 12, thereby effectively reducing the area where the protective cover plate 100 may contact the first electrode terminal in the circumferential direction of the inner circumferential wall of the first groove 12. For example, in some embodiments, along the thickness direction of the body 10, the end surfaces defined by all the first protrusions 20 for contacting the first electrode terminal are not a closed structure, or, in some embodiments, the length dimension of the portion of the first protrusion 20 connected to the first groove 12 is smaller than the circumferential dimension of the inner circumferential wall of the first groove 12, and the length corresponds to the circumferential dimension of the inner circumferential wall of the first groove 12.

[0106] According to some embodiments of the present application, along the thickness direction of the main body 10, the first protrusion 20 may also have a certain distance from the opening of the first groove 12, that is, the width dimension of the part of the first protrusion 20 connected to the first groove 12 is smaller than the depth dimension of the inner wall of the first groove 12, and the above-mentioned width direction corresponds to the depth direction of the first groove 12, that is, the thickness direction of the main body 10 (that is, the Z direction).

[0107] According to some embodiments of the present application, the main body 10 and the first protrusion 20 are an integral structure.

[0108] In the above technical solution, the first convex portion 20 is integrally formed on the inner peripheral wall of the first groove 12 of the body 10. When the first convex portion 20 is in contact with the first electrode terminal and subjected to force, the relative position of the first convex portion 20 and the body 10 is fixed, that is, the first convex portion 20 will not move relative to the body 10. The body 10 and the first convex portion 20 are an integral structure, which simplifies the structure of the protective cover plate 100 and facilitates the production of the protective cover plate 100.

[0109] It should be noted that, in some embodiments, the buckling scheme of the protective cover plate 100 can be set so that the protective cover plate 100 can be adaptively fine-tuned in angle and position after being in contact with the first electrode terminal and subjected to force during the buckling process. During the buckling process of the protective cover plate 100, if it is slightly skewed and in contact with the first convex portion 20, under the action of the first convex portion 20, the protective cover plate 100 can gradually adjust to a posture aligned with the first electrode terminal, further reducing the wear and damage of the first convex portion 20 and the inner peripheral wall of the first groove 12 to the first electrode terminal. In other words, when the first electrode terminal and the protective cover plate 100 interact with each other, the end cap and the electrode assembly can adaptively fine-tune their positions to achieve the technical effect of reducing the wear of the first electrode terminal, which will not be elaborated at this time.

[0110] According to some embodiments of the present application, along the thickness direction of the body 10, the first protrusion 20 includes a connected guide surface 21 and a positioning surface 22, the guide surface 21 is closer to the opening of the first groove 12 than the positioning surface 22, and the guide surface 21 is inclined relative to the positioning surface 22;

[0111] The dimension of the guide surface 21 protruding from the inner peripheral wall of the first groove 12 gradually increases from the end of the guide surface 21 away from the positioning surface 22 to the end close to the positioning surface 22 .

[0112] In the above technical solution, along the thickness direction of the body 10, the first convex portion 20 includes a connected guide surface 21 and a positioning surface 22, and the guide surface 21 and the positioning surface 22 are at least part of the surface of the first convex portion 20 facing the inner cavity of the first groove 12. The guide surface 21 and the inner peripheral wall of the first groove 12 enclose a guide cavity, and the positioning surface 22 and the inner peripheral wall of the first groove 12 enclose a positioning cavity.

[0113] like Figure 3 and Figure 6 As shown, the guide surface 21 is closer to the opening of the first groove 12 than the positioning surface 22, that is, along the direction from the opening of the first groove 12 to the internal chamber of the first groove 12, the guide surface 21 is closer to the opening of the first groove 12, and the positioning surface 22 is closer to the bottom of the first groove 12. After the protective cover 100 is buckled into place, the top of the first electrode terminal extends into the positioning cavity surrounded by the positioning surface 22 and the inner circumferential wall of the first groove 12. The circumferential surface of the top of the first electrode terminal may contact with at least one of the positioning surface 22 and the inner circumferential wall of the first groove 12, or may not contact with the positioning surface 22 and the inner circumferential wall of the first groove 12.

[0114] The guide surface 21 is inclined relative to the positioning surface 22, that is, there is a certain angle between the guide surface 21 and the positioning surface 22. And from the end of the guide surface 21 away from the positioning surface 22 to the end close to the positioning surface 22, the size of the guide surface 21 protruding from the inner peripheral wall of the first groove 12 gradually increases, that is, the size of the guide cavity surrounded by the guide surface 21 and the inner peripheral wall of the first groove 12 will be larger than the size of the positioning cavity surrounded by the positioning surface 22 and the inner peripheral wall of the first groove 12. The existence of the guide surface 21 can reserve a certain margin for the protective cover 100 for the first groove 12 and the first electrode terminal to quickly align and cooperate, which can not only effectively reduce the occurrence of severe wear and scratches on the protective cover 100 and the first electrode terminal, but also improve the pick-up and placement speed of the protective cover body to a certain extent, thereby improving the efficiency of the step of sealing and welding the end cover and the shell.

[0115] According to some embodiments of the present application, the guide surface 21 is a first arcuate surface protruding toward the inner cavity of the first groove 12 , and the positioning surface 22 is a second arcuate surface protruding toward the inner cavity of the first groove 12 .

[0116] like Figure 3 , Figure 5-Figure 6 As shown, both the first arc surface and the second arc surface are curved surfaces with a certain curvature. The surfaces of the first arc surface and the second arc surface are relatively smooth, and can have a certain buffering effect when in contact with the first electrode terminal.

[0117] In the above technical solution, the guide surface 21 is configured as a first curved surface protruding toward the internal cavity of the first groove 12, and the positioning surface 22 is configured as a second curved surface protruding toward the internal cavity of the first groove 12. The first curved surface and the second curved surface both have a certain curvature and are smooth curved surfaces with a certain buffering effect. They can effectively reduce the wear of the guide surface 21 and the positioning surface 22 on the surface of the first electrode terminal, and reduce the large-area wiredrawing of the first electrode terminal caused by the cutting force along the thickness direction of the main body 10.

[0118] According to some embodiments of the present application, along the thickness direction of the body 10 , the first protrusion 20 and the opening of the first groove 12 may have a certain distance, that is, the guide surface 21 and the opening of the first groove 12 have a certain distance.

[0119] According to some embodiments of the present application, in order to further reserve a certain margin for the protective cover 100 for the first groove 12 to be quickly aligned with the first electrode terminal, a guide bevel 18 can be set on the inner wall of the opening end of the first groove 12. Along the thickness direction of the main body 10, the guide bevel 18 is closer to the opening of the first groove 12 than the first protrusion 20.

[0120] According to some embodiments of the present application, the orthographic projection of the axis of the first arcuate surface on the inner circumferential wall of the first groove 12 is parallel to the thickness direction of the body 10 , and the axis of the second arcuate surface is parallel to the thickness direction of the body 10 .

[0121] The “positive projection of the axis of the first curved surface on the inner circumferential wall” here refers to the projection component of the axis of the first curved surface on the inner circumferential wall of the first groove 12 when the observer observes in a direction perpendicular to the inner circumferential wall of the first groove 12 .

[0122] In the above technical solution, since the direct projection of the axis of the first arcuate surface on the inner circumferential wall of the first groove 12 is parallel to the thickness direction of the main body 10, the extension direction of the first arcuate surface is roughly the thickness direction of the main body 10, and the first arcuate surface has a certain angle with the thickness direction of the main body 10. In other words, the axis of the first arcuate surface does not have a projection component projected on the circumferential direction of the inner circumferential wall of the first groove 12.

[0123] The axis of the second arcuate surface is parallel to the thickness direction of the body 10 , and the second arcuate surface extends along the thickness direction of the body 10 . The axis of the second arcuate surface also has no projection component projected onto the circumferential direction of the inner circumferential wall of the first groove 12 .

[0124] like Figure 3As shown, by making the axis of the first arcuate surface and the axis of the second arcuate surface have no projection component projected on the circumferential direction of the inner wall of the first groove 12, the guide surface 21 and the positioning surface 22 can be used for point contact with the first electrode terminal, which is different from the surface contact and line contact solutions in the related art. The wear of the protective cover 100 on the first electrode terminal can be greatly reduced, and the wire drawing condition on the surface of the first electrode terminal can be significantly improved.

[0125] It should be noted that, in some embodiments, the first arcuate surface and the second arcuate surface can be set as axisymmetric surfaces, that is, the first arcuate surface is a symmetrical structure with the generatrix of the inner circumferential wall of the first groove 12 being the symmetry axis. Similarly, the second arcuate surface can be a symmetrical structure with the generatrix of the inner circumferential wall of the first groove 12 being the symmetry axis.

[0126] In some embodiments, the generatrix of the first arcuate surface most protruding from the inner circumferential wall of the first groove 12 and the generatrix of the second arcuate surface most protruding from the inner circumferential wall of the first groove 12 can also be set to be coplanar.

[0127] According to some embodiments of the present application, the first protrusion 20 further includes a transition surface 23 , and the guide surface 21 and the positioning surface 22 are transitioned in an arc shape through the transition surface 23 .

[0128] In the above technical solution, if Figure 6 As shown, since there is a certain angle between the guide surface 21 and the positioning surface 22, a transition surface 23 is provided, and the transition surface 23 smoothly connects the guide surface 21 and the positioning surface 22, and the sharp angle between the guide surface 21 and the positioning surface 22 is removed by an arc transition, so that the first protrusion 20 can further smoothly contact the first electrode terminal, thereby reducing the wear and tear of the first electrode terminal, thereby improving the charging and discharging performance, reliability and stability of the battery.

[0129] According to some embodiments of the present application, the inner peripheral wall of the first groove 12 includes two first walls 121 arranged opposite to each other along a first direction, each first wall 121 is provided with a first protrusion 20 , and the first direction is perpendicular to the thickness direction of the body 10 .

[0130] In some embodiments, the first direction may be the length direction of the protective cover plate 100 . In some embodiments, the first direction may also be the width direction of the protective cover plate 100 .

[0131] As shown in the figure, in this embodiment, the first direction is the width direction of the protective cover plate 100, that is, the Y direction.

[0132] In the above technical solution, the two first walls 121 are arranged opposite to each other in the first direction, and only one first protrusion 20 is arranged on each first wall 121, so that when the protective cover 100 is slightly tilted in the first direction, the two first walls 121 will not directly contact the first electrode terminal, but the two first protrusions 20 arranged opposite to each other along the first direction respectively contact the side surfaces of the first electrode terminal. On the one hand, the two first protrusions 20 cooperate with each other in the first direction, which can better limit the positioning of the protective cover 100 and the first electrode terminal. On the other hand, in the first direction, the protective cover 100 contacts the first electrode terminal only through the two first protrusions 20, which effectively reduces the area range where the protective cover 100 may contact the first electrode terminal, and can reduce the wear and drawing of the side surfaces of the first electrode terminal corresponding to the position of the first wall 121.

[0133] In addition, in this solution, when the first protrusion 20 is constructed as a structure that can make point contact with the first electrode terminal, along the first direction, the two first protrusions 20 respectively arranged on the two first walls 121 only make point contact with the first electrode terminal, which significantly reduces the cutting force that the first electrode terminal may be subjected to, so that the first electrode terminal has only slight wire drawing or even no wire drawing at the point contact portion, effectively ensuring the reliability and stability of charging and discharging of the battery cell.

[0134] According to some embodiments of the present application, the inner circumferential wall of the first groove 12 also includes two second walls 122 opposite to each other along the second direction, at least one of the two second walls 122 is provided with a second protrusion 30, and the first direction, the second direction and the thickness direction of the body 10 are perpendicular to each other.

[0135] One of the first direction and the second direction is the length direction of the body 10, and the other corresponds to the width direction of the body 10. Both ends of the first wall 121 are connected to the two second walls 122 respectively, and the two first walls 121 and the two second walls 122 together form the inner peripheral wall of the first groove 12.

[0136] like Figure 2 and Figure 3 As shown, in this embodiment, the first direction is the width direction of the protective cover plate 100, that is, the Y direction. The second direction is the length direction of the protective cover plate 100, that is, the X direction.

[0137] In the above technical solution, the second protrusion 30 has the same function as the first protrusion 20, and is protruded from the inner wall of the first groove 12. The first protrusion 20, the second protrusion 30 and the inner wall of the first groove 12 jointly define an escape space for accommodating the first electrode terminal.

[0138] Since the second protrusion 30 protrudes from the inner circumferential wall of the first groove 12, that is, the projection of the second protrusion 30 relative to the inner circumferential wall of the first groove 12 falls on the inner circumferential wall of the first groove 12, and the projection area of ​​the second protrusion 30 is smaller, when the main body 10 is slightly tilted relative to the first electrode terminal, part of the inner circumferential wall of the first groove 12 and the second protrusion 30 will contact the first electrode terminal, and in the process of continuing to buckle the cover, a certain amount of cutting friction will be generated between the protective cover plate 100 and the first electrode terminal. However, compared with the inner circumferential wall directly contacting the first electrode terminal over a large area, the part where the second protrusion 30 is located can effectively reduce the contact area between the protective cover plate 100 and the first electrode terminal.

[0139] When both the first protrusion 20 and the second protrusion 30 can contact the first electrode terminal, the contact area between the first protrusion 20 and the first electrode terminal is smaller than that between the first wall 121, and the contact area between the second protrusion 30 and the first electrode terminal is also smaller than that between the second wall 122, thereby effectively reducing the range of wiredrawing on the surface of the first electrode terminal caused by wear and scratches between the protective cover plate 100 and the first electrode terminal, reducing the severity of wiredrawing of the first electrode terminal, and further improving the stability and reliability of charging and discharging of the battery cell.

[0140] In some embodiments, for a battery cell having only a first electrode terminal, a first protrusion 20 may be provided on each first wall 121 and a second protrusion 30 may be provided on each second wall 122 to fully limit and position the first electrode terminal in the circumferential direction.

[0141] In some embodiments, the second protrusion 30 is substantially the same in structure as the first protrusion 20. The second protrusion 30 may also be constructed as a structure in point contact with the first electrode terminal. The outer surface of the second protrusion 30 facing the internal cavity of the first groove 12 also includes a connected guide surface 21 and a positioning surface 22. The relative position and specific structure of the guide surface 21 and the positioning surface 22 may refer to the above-mentioned description of the first protrusion 20 and will not be repeated here.

[0142] It should be noted that the two first protrusions 20 can be staggered or arranged opposite to each other in the first direction. Similarly, the two second protrusions 30 can be staggered or arranged opposite to each other in the second direction.

[0143] According to some embodiments of the present application, the first surface 11 has a second groove 13 for avoiding the second electrode terminal of the battery cell, and the second groove 13 is spaced apart from the first groove 12 in the second direction;

[0144] Wherein, along the first direction, the second slot 13 includes two opposite third walls 131 , and a third protrusion 40 is disposed on at least one of the two third walls 131 .

[0145] The second groove 13 is a blind groove sunk in the first surface 11 of the body 10 , and can receive the second electrode terminal. The second groove 13 is spaced apart from the first groove 12 in the second direction.

[0146] The third protrusion 40 has the same function as the first protrusion 20 and is a structure protruding from the third wall 131. The third protrusion 40 will not completely cover the third wall 131. The size of the portion of the third protrusion 40 connecting the third wall 131 will be smaller than the size of the third wall 131, that is, the width and / or length of the third protrusion 40 will be smaller than the corresponding size of the third wall 131, and the length corresponds to the circumferential size of the inner wall of the second groove 13.

[0147] In the technical solution of the embodiment of the present application, for a battery cell having a first electrode terminal and a second electrode terminal, in order to protect the second electrode terminal and reduce the impact of the welding process on the performance of the second electrode terminal, a second groove 13 is provided to avoid the second electrode terminal, and at the same time, the first groove 12 avoids the first electrode terminal. After the main body 10 is completely buckled on the end cover, the first electrode terminal is accommodated in the first groove 12, and the second electrode terminal is accommodated in the second groove 13. The protective cover plate 100 protects the first electrode terminal and the second electrode terminal, and can protect the first electrode terminal and the second electrode terminal from being burned and corroded by metal spatter during welding.

[0148] The third protrusion 40 has the same function as the first protrusion 20, and is protruded from the third wall 131. That is to say, the projection of the third protrusion 40 relative to the third wall 131 falls on the third wall 131, and the projection area of ​​the third protrusion 40 is smaller. When the body 10 is slightly tilted relative to the first electrode terminal and the second electrode terminal, part of the inner peripheral wall of the first groove 12 and the first protrusion 20 will contact the first electrode terminal, and part of the third wall 131 and the third protrusion 40 will contact the second electrode terminal. In the process of continuing to buckle the cover, the protective cover 100 is in contact with the first electrode terminal and the second electrode terminal. A certain amount of cutting friction will be generated between the pole terminals, but compared with the inner circumferential wall of the first groove 12 and the third wall 131 directly contacting the first electrode terminal and the second electrode terminal respectively over a large area, the portion where the first protrusion 20 and the third protrusion 40 are located can effectively reduce the contact area between the protective cover plate 100 and the first electrode terminal and the second electrode terminal, and effectively reduce the range of wire drawing on the surface of the first electrode terminal and the first electrode terminal caused by wear and scratches on the protective cover plate 100 and the first electrode terminal and the second electrode terminal, thereby further improving the stability and reliability of charging and discharging of the battery cell.

[0149] The third protrusion 40 and the third wall 131 together define an internal escape space of the second groove 13 for accommodating the second electrode terminal.

[0150] In some embodiments, there may be multiple third protrusions 40, and multiple third protrusions 40 may be arranged at intervals along the circumference of the third wall 131 to achieve multi-point protection. When the protective cover 100 is slightly tilted, the second electrode terminal contacts one third protrusion 40 or contacts multiple third protrusions 40 at the same time, but does not directly contact the third wall 131, thereby further reducing the contact area between the protective cover 100 and the second electrode terminal, which can effectively reduce the coverage of the wire drawing on the surface of the second electrode terminal and reduce the wire drawing severity of the second electrode terminal.

[0151] Similar to the structures of the first groove 12 and the first protrusion 20, the undetailed structures of the second groove 13 and the third protrusion 40 can refer to the above-mentioned structural description of the first protrusion 20. For example, in some embodiments, the main body 10 and the first protrusion 20 are an integral structure; for example, in some embodiments, the first protrusion 20 includes a connected guide surface 21 and a positioning surface 22; for example, in some embodiments, the guide surface 21 is a first arcuate surface protruding toward the internal cavity of the first groove 12, and the positioning surface 22 is a second arcuate surface protruding toward the internal cavity of the first groove 12, etc., which will not be repeated here.

[0152] The sizes of the first protrusion 20 and the third protrusion 40 may be slightly different, and may be adaptively adjusted according to the structure and size of the corresponding battery cell.

[0153] According to some embodiments of the present application, each of the two third walls 131 is provided with a third protrusion 40 .

[0154] In the above technical solution, the two third walls 131 are arranged opposite to each other in the first direction, and only one third protrusion 40 is arranged on each third wall 131, so that when the protective cover 100 is slightly tilted in the first direction, the two third walls 131 will not directly contact the second electrode terminal, but the two third protrusions 40 arranged opposite to each other along the first direction respectively contact the side surfaces of the second electrode terminal. On the one hand, the two third protrusions 40 cooperate with each other in the first direction, which can better limit the positioning of the protective cover 100 and the second electrode terminal. On the other hand, in the first direction, the protective cover 100 contacts the second electrode terminal only through the two third protrusions 40, which effectively reduces the area range where the protective cover 100 may contact the second electrode terminal, and can reduce the wear and drawing of the side surfaces of the second electrode terminal corresponding to the position of the third wall 131.

[0155] In addition, in this solution, when the third protrusion 40 is constructed as a structure that can make point contact with the second electrode terminal, along the first direction, the two third protrusions 40 respectively arranged on the two third walls 131 only make point contact with the second electrode terminal, which significantly reduces the cutting force that the second electrode terminal may be subjected to, so that the second electrode terminal has only slight wire drawing or even no wire drawing at the point contact portion, effectively ensuring the reliability and stability of charging and discharging of the battery cell.

[0156] According to some embodiments of the present application, along the second direction, the second slot 13 further includes two opposite fourth walls 132 , and a fourth protrusion 50 is disposed on at least one of the two fourth walls 132 .

[0157] One of the first direction and the second direction is the length direction of the body 10, and the other corresponds to the width direction of the body 10. Both ends of the third wall 131 are connected to the two fourth walls 132 respectively, and the two third walls 131 and the two fourth walls 132 together form the inner peripheral wall of the second groove 13.

[0158] like Figure 3 and Figure 5 As shown, the first direction is the width direction of the body 10 , and the second direction is the length direction of the body 10 .

[0159] The fourth protrusion 50 has the same function as the first protrusion 20 and the third protrusion 40 . The fourth protrusion 50 protrudes from the fourth wall 132 . The third protrusion 40 , the fourth protrusion 50 , the third wall 131 and the fourth wall 132 together define an escape space for accommodating the second electrode terminal.

[0160] The structure and function of the fourth protrusion 50 may refer to the above description of the first protrusion 20 and / or the third protrusion 40 , which will not be elaborated here.

[0161] According to some embodiments of the present application, the second protrusion 30 and the fourth protrusion 50 are both one, and along the second direction, the second protrusion 30 is disposed on one of the two second walls 122 close to the second groove 13, and the fourth protrusion 50 is disposed on one of the two fourth walls 132 close to the first groove 12, and the second direction is the length direction of the main body 10.

[0162] In the above technical solution, the second direction is the length direction of the body 10. Corresponding to the structure of the battery cell, the first electrode terminal and the second electrode terminal are often spaced apart along the second direction. The second protrusion 30 and the fourth protrusion 50 are respectively arranged on the second wall 122 close to the second groove 13 and the fourth wall 132 close to the first groove 12 in the second direction, so as to position and contact the two end faces of the first electrode terminal and the second electrode terminal close to each other in the second direction. That is, the protective cover plate 100 can be applied to the welding protection of multiple or multiple specifications of battery cells with the same minimum spacing between the first electrode terminal and the second electrode terminal in the second direction, so that the protective cover plate 100 can be used universally within a certain range, which is beneficial to control production costs, optimize production rhythm, and improve battery production efficiency to a certain extent.

[0163] According to some embodiments of the present application, the second protrusion 30 and the fourth protrusion 50 are both one, and along the second direction, the second protrusion 30 is arranged on one of the two second walls 122 away from the second groove 13, and the fourth protrusion 50 is arranged on one of the two fourth walls 132 away from the first groove 12, and the second direction is the length direction of the main body 10.

[0164] In the above technical solution, the second direction is the length direction of the body 10 (i.e., the Y direction). Corresponding to the structure of the battery cell, the first electrode terminal and the second electrode terminal are often spaced apart along the second direction. The second protrusion 30 and the fourth protrusion 50 are respectively arranged on the second wall 122 away from the second groove 13 and the fourth wall 132 away from the first groove 12, so as to position and contact the two end faces of the first electrode terminal and the second electrode terminal that are away from each other in the second direction. That is, the protective cover 100 can be applied to the welding protection of multiple or multiple specifications of battery cells with the same maximum spacing between the first electrode terminal and the second electrode terminal in the second direction, so that the protective cover 100 can be universally used within a certain range, which is beneficial to control production costs, facilitate optimization of production rhythm, and improve battery production efficiency to a certain extent.

[0165] In addition, since the sizes of the first electrode terminal and the second electrode terminal of some battery cells are different, the end surfaces of the first electrode terminal and the second electrode terminal that are far away from each other are symmetrical on the center of the end cover, which makes the end surfaces of the first electrode terminal and the second electrode terminal that are close to each other asymmetrical on the end cover. At this time, since the second protrusion 30 and the fourth protrusion 50 act on the end surfaces of the first electrode terminal and the second electrode terminal that are far away from each other, the battery cell can still correspond to the second protrusion 30 and the fourth protrusion 50 after rotating 180° with the height direction as the axis. In other words, the front and back of the battery cell when it is incoming will not affect the subsequent buckling of the protective cover 100 and the positioning of the first electrode terminal and the second electrode terminal. The two electrode terminals of the battery cell do not need to distinguish between the first electrode terminal and the second electrode terminal, and the first groove 12 can be used to cooperate with either of the two electrode terminals.

[0166] On the other hand, since the sizes of the first electrode terminal and the second electrode terminal of some battery cells may be different, the maximum distance between the first electrode terminal and the second electrode terminal in the second direction of different battery cells may be designed to be the same, but the minimum distance between the first electrode terminal and the second electrode terminal in the second direction may be designed to be different. In this case, since the second protrusion 30 and the fourth protrusion 50 act on the end surfaces of the first electrode terminal and the second electrode terminal that are away from each other, as long as the maximum distance between the first electrode terminal and the second electrode terminal in the second direction is the same, the same protective cover plate 100 can be used to protect the welding process.

[0167] According to some embodiments of the present application, the first surface 11 of the protective cover plate 100 also has a third groove 14 for avoiding the pressure relief mechanism of the battery cell, thereby protecting the pressure relief mechanism and effectively isolating the material sputtered during welding from falling on the end cover, the first electrode terminal, the second electrode terminal and the pressure relief mechanism.

[0168] In addition, after the protective cover plate 100 is buckled onto the end cover, the position of the injection hole can also be closed, so that the welding materials during the welding process and impurities in the air will not enter the battery cell through the injection hole, effectively protecting the battery cell and reducing the risk of battery cell performance degradation or even short circuit and fire due to metal or non-metal foreign matter entering the battery cell.

[0169] According to some embodiments of the present application, in order to adapt to pressure relief mechanisms of different shapes, the third groove 14 includes a first sub-groove and two second sub-grooves. The first sub-groove is roughly square, and the two second sub-grooves are spaced apart along the second direction and are respectively connected to the two end surfaces of the first sub-groove in the second direction, thereby being suitable for pressure relief mechanisms of square, elliptical or even other special-shaped structures.

[0170] In order to reduce the weight of the protective cover 100 , a weight-reducing blind hole 16 may be provided on the protective cover 100 . The weight-reducing blind hole 16 may be provided on the first surface 11 or on the second surface 15 opposite to the first surface 11 in the thickness direction of the body 10 .

[0171] According to some embodiments of the present application, the protective cover 100 is driven to move by an electric-controlled linear drive mechanism to cover the end cover in a direction close to the battery cell. In order to connect and position with the electric-controlled linear drive mechanism, a pin hole 17 for accommodating a positioning pin can be provided on the second surface 15.

[0172] According to some embodiments of the present application, the present application provides a protective cover plate 100, including a main body 10. Along the thickness direction of the main body 10, the main body 10 has a first surface 11 and a second surface 15 relative to each other. Along the second direction, the first surface 11 is provided with a first groove 12 and a second groove 13 spaced apart from each other. The first groove 12 is used to avoid the first electrode terminal of the battery cell, and the second groove 13 is used to avoid the second electrode terminal of the battery cell. The second direction is the length direction of the protective cover plate 100.

[0173] The inner peripheral wall of the first groove 12 includes two first walls 121 arranged opposite to each other in the first direction and two second walls 122 arranged opposite to each other in the second direction, each of the first walls 121 is provided with a first convex portion 20, and each of the second walls 122 is provided with a second convex portion 30. The inner peripheral wall of the second groove 13 includes two third walls 131 arranged opposite to each other in the first direction and two fourth walls 132 arranged opposite to each other in the second direction, each of the third walls 131 is provided with a third convex portion 40, and each of the fourth walls 132 is provided with a fourth convex portion 50. The two third convex portions 40 are opposite to each other in the first direction, and the two fourth convex portions 50 are opposite to each other in the second direction.

[0174] The first protrusion 20 has the same structure and size as the third protrusion 40, and the third protrusion 40 has the same structure and size as the fourth protrusion 50. The first protrusion 20 and the third protrusion 40 are consistent in structure and composition, but there is a certain difference in specific size. The designed protective cover plate 100 has a total of 0.2 mm fitting clearance on both sides for matching with the first electrode terminal between the two first protrusions 20 facing each other in the first direction, a total of 0.2 mm fitting clearance on both sides for matching with the second electrode terminal between the two third protrusions 40 facing each other in the first direction, and a total of 0.2 mm fitting clearance on both sides for positioning the first electrode terminal and the second electrode terminal between the second protrusion 30 and the fourth protrusion 50 facing each other in the second direction.

[0175] Taking the first convex portion 20 as an example, the specific structure of the first convex portion 20 is described below. Along the thickness direction of the body 10, the first convex portion 20 includes a guide surface 21, a transition surface 23 and a positioning surface 22 connected in sequence, and the guide surface 21 and the positioning surface 22 are transitioned through the transition surface 23 in an arc shape. The guide surface 21 is a first arc surface protruding toward the inner chamber of the first groove 12, and the positioning surface 22 is a second arc surface protruding toward the inner chamber of the first groove 12. The orthographic projection of the axis of the first arc surface on the inner circumferential wall of the first groove 12 is parallel to the thickness direction of the body 10, and the axis of the second arc surface is parallel to the thickness direction of the body 10. There is an angle between the axes of the first arc surface and the second arc surface, so that the size of the guide surface 21 protruding from the inner circumferential wall of the first groove 12 gradually increases from the end of the guide surface 21 away from the positioning surface 22 to the end close to the positioning surface 22.

[0176] When the main body 10 is slightly tilted relative to the first electrode terminal, part of the inner circumferential wall of the first groove 12 and the first protrusion 20 will contact the first electrode terminal, and in the process of continuing to buckle the cover, a certain amount of cutting friction will be generated between the protective cover plate 100 and the first electrode terminal. However, compared with the inner circumferential wall directly contacting the first electrode terminal over a large area, the part where the first protrusion 20 is located can effectively reduce the contact area between the protective cover plate 100 and the first electrode terminal, and effectively reduce the range of wire drawing on the surface of the first electrode terminal caused by wear and scratches on the protective cover plate 100 and the first electrode terminal.

[0177] Through the above-mentioned structural design, the first protrusion 20 and the second protrusion 30 are constructed as a positioning structure for point contact with the first electrode terminal, and the third protrusion 40 and the fourth protrusion 50 are constructed as a positioning structure for point contact with the second electrode terminal, thereby changing the contact form between the protective cover plate 100 and the first electrode terminal and the second electrode terminal. The longitudinal cutting force in the point contact state is significantly weaker than the cutting force in the surface contact state, which can effectively maintain the surface quality of the first electrode terminal and the second electrode terminal, thereby improving the stability and reliability of the charging and discharging of the battery cell.

[0178] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A protective cover plate, used to protect the end cover of a battery cell when it is welded to the shell, characterized in that: include: A body, wherein along a thickness direction of the body, the body has a first surface, and the first surface has a first groove for avoiding a first electrode terminal of the battery cell; Wherein, a first convex portion is provided on the inner peripheral wall of the first groove.

2. The protective cover plate according to claim 1, characterized in that: The main body and the first protrusion are an integral structure.

3. The protective cover plate according to claim 1, characterized in that: Along the thickness direction of the body, the first protrusion includes a connected guide surface and a positioning surface, the guide surface is closer to the opening of the first groove than the positioning surface, and the guide surface is inclined relative to the positioning surface; Wherein, from an end of the guide surface away from the positioning surface to an end of the guide surface close to the positioning surface, a dimension of the guide surface protruding from the inner circumferential wall of the first groove gradually increases.

4. The protective cover plate according to claim 3, characterized in that: The guide surface is a first arc-shaped surface protruding toward the inner cavity of the first groove, and the positioning surface is a second arc-shaped surface protruding toward the inner cavity of the first groove.

5. The protective cover plate according to claim 4, characterized in that: The orthographic projection of the axis of the first arc-shaped surface on the inner peripheral wall of the first groove is parallel to the thickness direction of the body, and the axis of the second arc-shaped surface is parallel to the thickness direction of the body.

6. The protective cover plate according to claim 3, characterized in that: The first convex portion further comprises a transition surface, and the guide surface and the positioning surface are transitioned through a circular arc of the transition surface.

7. The protective cover plate according to any one of claims 1 to 6, characterized in that: The inner peripheral wall of the first groove includes two first walls arranged opposite to each other along a first direction, each of the first walls is provided with a first protrusion, and the first direction is perpendicular to the thickness direction of the body.

8. The protective cover plate according to claim 7, characterized in that: The inner peripheral wall of the first groove further includes two second walls opposite to each other along a second direction, at least one of the two second walls is provided with a second convex portion, and the first direction, the second direction and the thickness direction of the body are perpendicular to each other.

9. The protective cover plate according to claim 8, characterized in that: The first surface has a second groove for avoiding the second electrode terminal of the battery cell, and the second groove is spaced apart from the first groove in the second direction; Wherein, along the first direction, the second groove includes two opposite third walls, and at least one of the two third walls is provided with a third protrusion.

10. The protective cover plate according to claim 9, characterized in that: Each of the two third walls is provided with one third protrusion.

11. The protective cover plate according to claim 10, characterized in that: Along the second direction, the second groove further includes two opposite fourth walls, and a fourth protrusion is provided on at least one of the two fourth walls.

12. The protective cover plate according to claim 11, characterized in that: The second protrusion and the fourth protrusion are each one, and along the second direction, the second protrusion is arranged on one of the two second walls close to the second groove, and the fourth protrusion is arranged on one of the two fourth walls close to the first groove, and the second direction is the length direction of the main body.

13. The protective cover plate according to claim 11, characterized in that: The second protrusion and the fourth protrusion are each one, and along the second direction, the second protrusion is arranged on one of the two second walls away from the second groove, and the fourth protrusion is arranged on one of the two fourth walls away from the first groove, and the second direction is the length direction of the main body.

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