Battery cover plate and single battery

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery cover plate and a single battery, the battery cover plate comprises a cover plate body, the cover plate body is provided with a pole hole and / or a liquid injection hole and / or an anti-explosion valve hole; a welding part is arranged on the edge of the cover plate body, the thickness of the welding part in a first direction is larger than that of the cover plate body in the first direction, and the first direction is the thickness direction of the cover plate body; the welding part comprises a welding surface parallel to the first direction, and the welding surface is located on the side, away from the cover plate body, of the welding part; and the welding part and the cover plate body are integrally formed through a stamping process. The requirement of the welding penetration depth for the material thickness is met, the overall light weight is achieved through thinning of the cover plate body in the non-welding area, and balance is achieved between cost reduction, weight reduction and reliability.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to a battery cover and a single battery cell. Background Technology

[0002] The outer casing of a prismatic battery typically consists of a shell with an opening and a cover plate that is welded to the opening. The welding area around the cover plate is mostly flat, and when the cover plate is thick enough, it meets the requirements for weld penetration. However, in the current context of weight reduction and cost reduction, the cover plate is usually thinner, which greatly reduces its cost. But this also introduces welding risks to the cover plate, which greatly affects the use of lightweight cover plates. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a battery cover and a single battery cell that can achieve lightweighting while ensuring the connection strength between the cover and the casing.

[0004] To achieve the above and other related objectives, this utility model provides a battery cover, comprising:

[0005] The cover plate body is provided with an electrode hole and / or a liquid injection hole and / or an explosion-proof valve hole;

[0006] The edge of the cover plate body is provided with a welding part, and the thickness of the welding part in a first direction is greater than the thickness of the cover plate body. The first direction is the thickness direction of the cover plate body.

[0007] The welded portion includes a welded surface that extends integrally along the first direction, the welded surface being located on the side of the welded portion away from the cover plate body;

[0008] The welded part is integrally formed with the cover plate body through a stamping process.

[0009] In an optional embodiment of this utility model, the welding part includes a protrusion formed by bending or flowing the edge material of the cover plate body through a stamping process, and the protrusion direction of the protrusion is parallel to the first direction.

[0010] In an optional embodiment of this utility model, a right-angle portion is formed between the outer end face of the welding portion and the welding surface.

[0011] In an optional embodiment of this utility model, the thickness of the welded portion in the first direction is greater than or equal to 1 mm, and / or the height of the welded surface in the first direction is greater than or equal to 0.8 mm.

[0012] In an optional embodiment of this utility model, the width of the welded portion in the second direction is greater than or equal to 0.3 mm, the second direction is a direction parallel to the surface of the cover plate body and perpendicular to the edge of the cover plate body, the thickness of the cover plate body is less than or equal to 3 mm, and the width of the welded portion in the second direction is less than the thickness of the cover plate body.

[0013] In an optional embodiment of this utility model, the protrusion is formed by bending the edge material of the cover plate body outward from the cover plate body, and the protrusion and the outer surface of the cover plate body, as well as the welding surface and the inner surface of the cover plate body, are smoothly connected by rounded corners.

[0014] In an optional embodiment of this utility model, the protrusion height of the protrusion relative to the outer surface of the cover plate body is greater than or equal to 0.3 mm; the radius of the rounded corner is greater than or equal to 0.2 mm.

[0015] In an optional embodiment of this utility model, the protrusion is formed by bending the edge material of the cover plate body towards the inside of the cover plate body, the edge of the outer surface of the cover plate body is provided with a stamped recess, the recess and the welding surface form the right angle, and the protrusion and the inner surface of the cover plate body are smoothly connected by a rounded corner.

[0016] In an optional embodiment of this utility model, the protrusion height of the protrusion relative to the inner surface of the cover plate body is greater than or equal to 0.3 mm; the sinking depth of the sinking portion relative to the outer surface of the cover plate body is greater than or equal to 0.1 mm; the width of the sinking portion in a second direction is greater than or equal to 0.3 mm; the second direction is a direction parallel to the plate surface of the cover plate body and perpendicular to the edge of the cover plate body; and the radius of the rounded corner portion is greater than or equal to 0.2 mm.

[0017] In an optional embodiment of this utility model, a stamping groove is provided on the inner surface and / or outer surface of the cover plate body near the edge. The height of the groove wall on the side away from the center of the cover plate body is greater than the height of the groove wall on the side near the center of the cover plate body. The groove wall on the side away from the center of the cover plate body forms the protrusion. The protrusion and the bottom of the stamping groove are smoothly connected by a rounded corner.

[0018] In an optional embodiment of this utility model, the depth of the stamping groove is greater than or equal to 0.2 mm, the width of the stamping groove in the second direction is greater than or equal to 0.3 mm, the second direction is parallel to the surface of the cover plate body and perpendicular to the edge of the cover plate body, and the radius of the rounded corner is greater than or equal to 0.2 mm.

[0019] In an optional embodiment of this utility model, the edge of the cover plate body is formed with an arched portion by a stamping process. The arched portion forms a convex portion on the inner side in the first direction and a concave portion on the outer side in the first direction. The sidewall of the concave portion away from the center of the cover plate body forms the convex portion. The bottom surface of the convex portion and the concave portion, as well as the welding surface and the inner end surface of the convex portion, are smoothly connected by rounded corners.

[0020] In an optional embodiment of this utility model, the center thickness of the arched portion is less than the thickness of the cover plate body, the protrusion height of the convex portion relative to the inner surface of the cover plate body is greater than or equal to 0.5 mm, the depth of the concave portion is greater than or equal to 0.3 mm, the width of the concave portion in a second direction is greater than or equal to 0.5 mm, the second direction is a direction parallel to the plate surface of the cover plate body and perpendicular to the edge of the cover plate body; the radius of the rounded corner portion is greater than or equal to 0.2 mm.

[0021] To achieve the above and other related objectives, this utility model also provides a single battery cell, including the aforementioned battery cover.

[0022] The technical advantages of this utility model are as follows: By setting a locally thickened welding part at the edge of the cover plate body, this utility model not only meets the material thickness requirements for welding penetration, but also achieves overall lightweighting by thinning the cover plate body in the non-welded area; in addition, the stamping one-piece forming process avoids structural weakening at the connection between the welding part and the body, ensuring mechanical continuity, while the parallelism between the welding surface and the thickness direction of the cover plate body makes the energy focusing more stable during laser welding, further ensuring welding strength and sealing performance, and ultimately achieving a balance between cost reduction and reliability. Attached Figure Description

[0023] Figure 1 This is a perspective view of the single battery casing provided in an embodiment of the present invention;

[0024] Figure 2 This is a cross-sectional view of the single battery casing provided in an embodiment of this utility model;

[0025] Figure 3 yes Figure 2 A magnified view of part of the I;

[0026] Figure 4 This is a front view of the battery cover provided in Embodiment 1 of this utility model;

[0027] Figure 5 yes Figure 4 AA section view;

[0028] Figure 6 yes Figure 5 Partial magnified view of section II;

[0029] Figure 7 This is a front view of the battery cover provided in Embodiment 2 of this utility model;

[0030] Figure 8 yes Figure 7 BB section view;

[0031] Figure 9 yes Figure 8 III. Enlarged view of the part;

[0032] Figure 10 This is a front view of the battery cover provided in Embodiment 3 of this utility model;

[0033] Figure 11 yes Figure 10 CC section view;

[0034] Figure 12 yes Figure 11 A magnified view of part IV;

[0035] Figure 13 This is a front view of the battery cover provided in Embodiment 4 of this utility model;

[0036] Figure 14 yes Figure 13 DD sectional view;

[0037] Figure 15 yes Figure 14 A magnified view of the V section;

[0038] Figure 16 This is a front view of the battery cover provided in Embodiment 5 of this utility model;

[0039] Figure 17 yes Figure 16 EE sectional view;

[0040] Figure 18 yes Figure 17 A magnified view of part of VI. Detailed Implementation

[0041] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0042] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0043] Please see Figure 1-3 As shown, an embodiment of this utility model provides a battery casing for a single-cell battery, which is particularly suitable for prismatic batteries. The battery casing includes a housing 20 and a battery cover 10. One end of the housing 20 has an opening, and the battery cover 10 is welded to the opening. The battery casing is used to house the bare battery cell and electrolyte. The battery casing may be provided with terminal holes 101, an injection hole 102, and an explosion-proof valve hole 103. Two terminal holes 101 are provided, one for installing the positive terminal and the other for installing the negative terminal. The injection hole 102 is used to inject electrolyte into the battery casing, and the explosion-proof valve hole 103 is used to install an explosion-proof valve to ensure that high-temperature gases inside the battery can be smoothly discharged in the event of thermal runaway. In a specific embodiment, the terminal holes 101, the injection hole 102, and the explosion-proof valve hole 103 may be located on the battery cover 10, on the housing 20, or partially on the battery cover 10 and partially on the housing 20.

[0044] To ensure the welding strength between the battery cover 10 and the housing 20, sufficient weld penetration is required between them. However, with the increasing demands for lightweight batteries, the thickness of some battery covers is no longer sufficient to meet the welding strength requirements. Therefore, this invention provides a dedicated welding section 12 at the edge of the battery cover 10. The thickness of the welding section 12 meets the weld penetration requirements, and there can be a certain thickness difference between the welding section 12 and the cover body 11. This allows for minimizing the thickness of the battery cover 10 while maintaining welding strength, thus achieving lightweight requirements.

[0045] Please see Figure 1-18 As shown, the structure and principle of the battery cover 10 will be described in detail below with reference to specific embodiments:

[0046] Please see Figure 4-18As shown, the battery cover 10 provided in the embodiment of this utility model includes a cover body 11, which may be, for example, a sheet of aluminum. The cover body 11 is provided with an electrode post hole 101, an injection hole 102, and an explosion-proof valve hole 103. It should be understood that in some other embodiments, some or all of the electrode post hole 101, the injection hole 102, and the explosion-proof valve hole 103 may not be provided on the cover body 11. For example, some or all of the electrode post hole 101, the injection hole 102, and the explosion-proof valve hole 103 may be omitted. It is disposed on the housing 20; the edge of the cover plate body 11 is provided with a welding part 12, the thickness of the welding part 12 in a first direction is greater than the thickness H3 of the cover plate body 11, the first direction is the thickness direction of the cover plate body 11; the welding part 12 includes a welding surface 121 that extends integrally along the first direction, the welding surface 121 is located on the side of the welding part 12 away from the cover plate body 11; the welding part 12 is integrally formed with the cover plate body 11 by a stamping process.

[0047] This invention satisfies the material thickness requirement for welding penetration by setting a locally thickened welding part 12 at the edge of the cover plate body 11, and achieves overall lightweight by thinning the cover plate body 11 in the non-welded area. In addition, the stamping one-piece forming process avoids structural weakening at the connection between the welding part 12 and the body, ensuring mechanical continuity. At the same time, the parallelism between the welding surface 121 and the thickness direction of the cover plate body 11 makes the energy focusing more stable during laser welding, further ensuring welding strength and sealing performance, and ultimately achieving a balance between cost reduction and reliability.

[0048] Please see Figure 6 , 9 As shown in Figures 12, 15, and 18, in an optional embodiment of this utility model, the welding part 12 includes a protrusion 122 formed by bending or flowing the edge material of the cover plate body 11 through a stamping process. The protrusion direction of the protrusion 122 is parallel to the first direction. This further embodiment forms the protrusion 122 by directional bending / flowing the edge material of the cover plate through a stamping process. While maintaining the precise alignment between the welding surface 121 and the shell 20, the welding area is naturally thickened by the plastic deformation of the material. This avoids the weight increase caused by additional welding material and improves the fatigue resistance of the welding part 12 through the continuity of metal fibers. At the same time, the stamping integral forming process ensures that there is no stress concentration in the transition area between the protrusion 122 and the cover plate body 11, further optimizing the synergistic effect of lightweighting and structural reliability.

[0049] Please see Figure 6 , 9As shown in Figures 12, 15, and 18, in an optional embodiment of this utility model, a right-angle portion 121 is formed between the outer end face of the welding portion 12 and the welding surface 121. This further embodiment, by providing a right-angle portion 121 between the outer end face of the welding portion 12 and the welding surface 121, forms a clear welding positioning reference, making the energy more concentrated and the molten pool more stable during laser welding, thereby improving welding accuracy and consistency. Simultaneously, the right-angle structure enhances the local rigidity of the welding portion 12, reduces the risk of thermal deformation, and utilizes the natural thickening effect of the right-angle edge to further ensure the material thickness of the critical welding area, achieving a higher-strength welded connection under the premise of lightweight design.

[0050] It should be noted that in all descriptions of this utility model, the descriptions of "inner" and "outer" as indicators of orientation are based on the assembly state of the battery cover 10. That is, when the battery cover 10 is assembled with the housing 20, the side facing the inner cavity of the housing 20 is "inner", and the side away from the inner cavity of the housing 20 is "outer".

[0051] Please see Figure 6 , 9 As shown in Figures 12, 15, and 18, in an optional embodiment of this utility model, the thickness H1 of the welded portion 12 in the first direction is greater than or equal to 1 mm, and the height H2 of the weld surface 121 in the first direction is greater than or equal to 0.8 mm. It should be understood that the welded portion 12, in addition to the weld surface 121, may also have other structures such as rounded corners in the first direction. Therefore, the total thickness of the welded portion 12 should be greater than or equal to the height of the weld surface 121. Both the thickness of the welded portion 12 and the height of the weld surface 121 affect the weld penetration depth between the battery cover 10 and the casing 20. Therefore, the welding strength requirements can be met by limiting either of these two parameters. This further embodiment quantifies the balance between lightweighting and welding strength by clearly defining the critical values ​​of the thickness of the welded portion 12 or the height of the weld surface 121, ensuring that the weld penetration depth meets industry safety standards while minimizing material redundancy through precise control of the thickened area dimensions.

[0052] Please see Figure 6 , 9As shown in Figures 12, 15, and 18, in an optional embodiment of this utility model, the width L1 of the welding portion 12 in the second direction is greater than or equal to 0.3 mm. In this utility model, the second direction refers to a direction parallel to the surface of the cover plate body 11 and perpendicular to the edge of the cover plate body 11, which will not be elaborated further below. The thickness H3 of the cover plate body 11 is less than or equal to 3 mm, and the width L1 of the welding portion 12 in the second direction is less than the thickness H3 of the cover plate body 11. It should be noted that, in addition to the flat main body portion, the cover plate body 11 may also have some protruding or recessed structures, such as the groove structure at the injection hole 102. The thickness H3 of the cover plate body 11 in this utility model should be understood as the thickness of the flat main body portion of the cover plate body 11. This further embodiment, by limiting the width of the welded part 12, the thickness of the cover plate body 11, and the size relationship between the two, ensures that the welded area has sufficient material volume to form a stable weld depth, while compressing the thickness of the cover plate body 11 in the non-functional area as much as possible, achieving a significant weight reduction effect; the design that the width of the welded part 12 is less than the thickness of the cover plate ensures the controllability of material flow in the stamping process and avoids stamping defects such as wrinkles.

[0053] The forming method of the welded part 12 is described below with reference to several specific embodiments:

[0054] Example 1

[0055] Please see Figure 4-6 As shown, in this embodiment, the protrusion 122 is formed by bending the edge material of the cover plate body 11 outwards. The protrusion 122 and the outer surface of the cover plate body 11, and the welding surface 121 and the inner surface of the cover plate body 11 are smoothly connected by rounded corners R. The protrusion height H4 of the protrusion 122 relative to the outer surface of the cover plate body 11 is greater than or equal to 0.3 mm. The radius of the rounded corners R is greater than or equal to 0.2 mm. In a specific embodiment, the forming process of the battery cover 10 is as follows: First, the aluminum sheet is stamped as a whole to form a countersunk structure. Then, the cover plate auxiliary structures, such as the electrode hole 101, the liquid injection hole 102, and the explosion-proof valve hole 103, are made by stamping. Finally, the excess material around the perimeter is cut off to obtain the improved battery cover 10. This embodiment uses an integral stamping platform to thicken the edge of the cover plate body 11, and then cuts along the preset contour of the battery cover plate 10 to remove waste material, so that the protrusion height of the welding part 12 is precisely controlled to ≥0.3mm. This process route avoids the deformation risk of multi-process processing of thin plates and reduces production costs through process integration. In particular, the final cutting process can compensate for the previous stamping tolerances and ensure the dimensional consistency of the cover plate welding part 12 in mass production.

[0056] Example 2

[0057] Please see Figure 7-9 As shown, in this embodiment, the protrusion 122 is formed by bending the edge material of the cover plate body 11 towards the inside of the cover plate body 11. The edge of the outer surface of the cover plate body 11 is provided with a stamped recessed portion 124. The recessed portion 124 and the welding surface 121 form a right angle portion 121. The protrusion 122 and the inner surface of the cover plate body 11 are smoothly connected by a rounded corner portion R. The protrusion height H5 of the protrusion 122 relative to the inner surface of the cover plate body 11 is greater than or equal to 0.3 mm. The recess depth H6 of the recessed portion 124 relative to the outer surface of the cover plate body 11 is greater than or equal to 0.1 mm. The width L2 of the recessed portion 124 in the second direction is greater than or equal to 0.3 mm. The radius of the rounded corner portion R is greater than or equal to 0.2 mm. In a specific embodiment, the forming process of the battery cover 10 is as follows: First, the entire aluminum sheet is reverse-stamped to form a boss-shaped structure. Then, the cover's auxiliary structures, such as the terminal hole 101, the liquid injection hole 102, and the explosion-proof valve hole 103, are formed through a stamping process. Next, the edges are bent and chamfered to form a straight wall structure. Finally, the excess material around the edges is cut off to obtain the improved battery cover 10. In this embodiment, a material thickness gradient is established by pre-forming the boss through reverse stamping. Then, the edges are precisely extruded into a welding surface 121 with a right-angle portion 121 through a stamping process. With the smooth transition of the rounded corner radius, the continuity of the metal fibers during the stamping process is ensured. The right-angle portion 121 and the recessed portion 124 form a self-aligning welding structure. This process combination effectively solves the springback control problem that easily occurs in bent structures, so that the ultra-thin cover can still maintain the dimensional stability of the welding part 12 after complex deformation.

[0058] Example 3

[0059] Please see Figure 10-12As shown, in this embodiment, a stamping groove 125 is provided on the inner surface and / or outer surface of the cover plate body 11 near the edge. The height of the groove wall on the side of the stamping groove 125 away from the center of the cover plate body 11 is greater than the height of the groove wall on the side of the stamping groove 125 near the center of the cover plate body 11. The groove wall on the side of the stamping groove 125 away from the center of the cover plate body 11 forms the protrusion 122. The protrusion 122 and the bottom of the groove 125 are smoothly connected by a rounded corner R. The depth H7 of the stamping groove 125 is greater than or equal to 0.2 mm, the width L3 of the stamping groove 125 in the second direction is greater than or equal to 0.3 mm, and the radius of the rounded corner R is greater than or equal to 0.2 mm. In a specific embodiment, the forming process of the battery cover 10 is as follows: First, the cover's auxiliary structures, such as the terminal post hole 101, the liquid injection hole 102, and the explosion-proof valve hole 103, are made through a stamping process. Then, the material at the surrounding edges is extruded to the welding area through stamping to obtain the improved battery cover 10. This embodiment achieves directional flow of the material in the welding part 12 by precisely controlling the parameters of the stamping groove 125, guiding the metal flow to accumulate in the welding area. This single-process extrusion molding process avoids the cumulative dimensional errors of multi-step processing, achieving lightweighting through material redistribution while ensuring the dimensional accuracy of the welding part 12, significantly improving production cycle time and yield.

[0060] Example 4

[0061] Please see Figure 13-15 As shown in Figures 16-18, in this embodiment, the edge of the cover plate body 11 is formed with an arched portion by a stamping process. The arched portion forms a protrusion 126 on the inner side in the first direction and a concave portion 127 on the outer side in the first direction. The sidewall of the concave portion 127 away from the center of the cover plate body 11 forms a protrusion 122. The bottom surfaces of the protrusion 122 and the concave portion 127, as well as the welding surface 121 and the inner end face of the protrusion 126, are smoothly connected by rounded corners R. The center thickness H10 of the arched portion is less than the thickness of the cover plate body 11. The protrusion height H8 of the protrusion 126 relative to the inner surface of the cover plate body 11 is greater than or equal to 0.5 mm. The depth H9 of the concave portion 127 is greater than or equal to 0.3 mm. The width L4 of the concave portion 127 in the second direction is greater than or equal to 0.5 mm. The radius of the rounded corner R is greater than or equal to 0.2 mm. In a specific embodiment, the forming process of the battery cover 10 is as follows: First, the auxiliary structures of the cover, such as the electrode post hole 101, the liquid injection hole 102, and the explosion-proof valve hole 103, are made by stamping. Then, the aluminum sheet is formed around the cover using stamping and other methods. Figure 15 The sunken platform type shown or Figure 18The "V" shaped structure shown is further improved by cutting away excess material around the edges to obtain the battery cover 10. This embodiment uses an arched stamping design to bend the edge material in both directions, thinning the center while forming a high-strength welded protrusion 122 on the outside. The recessed or "V" shaped structure itself can act as a reinforcing rib to improve the structural strength of the edge of the battery cover 10.

[0062] In summary, this utility model, by setting a locally thickened welding part 12 at the edge of the cover plate body 11, not only meets the material thickness requirements for welding penetration, but also achieves overall lightweighting by thinning the cover plate body 11 in the non-welded area. Furthermore, the stamping integral forming process avoids structural weakening at the connection between the welding part 12 and the body, ensuring mechanical continuity. Simultaneously, the parallelism between the welding surface 121 and the thickness direction of the cover plate body 11 makes energy focusing more stable during laser welding, further guaranteeing welding strength and sealing performance, ultimately achieving a balance between cost reduction, weight reduction, and reliability. The stamping process causes the cover plate edge material to bend / flow in a directional manner to form a protrusion 122. While maintaining precise alignment between the welding surface 121 and the shell 20, the plastic deformation of the material naturally thickens the welding area, avoiding the weight increase caused by additional welding material. The continuity of metal fibers improves the fatigue resistance of the welding part 12. At the same time, the stamping integral forming process ensures no stress concentration in the transition area between the protrusion 122 and the cover plate body 11, further optimizing the synergistic effect of lightweighting and structural reliability. Through the welding part 122… A right-angle portion 121 is provided between the outer end face and the welding surface 121 to form a clear welding positioning reference, making the energy more concentrated and the molten pool more stable during laser welding, thereby improving welding accuracy and consistency. At the same time, the right-angle structure enhances the local rigidity of the welding part 12, reduces the risk of thermal deformation, and utilizes the natural thickening effect of the right-angle edge to further ensure the material thickness of the key welding area, achieving a higher strength welded connection under the premise of lightweighting. By clearly defining the critical value of the thickness of the welding part 12 or the height of the welding surface 121, the balance point between lightweighting and welding strength is quantified, ensuring that the welding penetration depth meets industry safety standards, and minimizing material redundancy by precisely controlling the size of the thickened area. By limiting the width of the welding part 12, the thickness of the cover plate body 11, and the size relationship between the two, the thickness of the cover plate body 11 in the non-functional area is compressed as much as possible while ensuring that the welding area has sufficient material volume to form a stable penetration depth, achieving a significant weight reduction effect. The design that the width of the welding part 12 is less than the thickness of the cover plate ensures the controllability of material flow in the stamping process and avoids stamping defects such as wrinkles.

[0063] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0064] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

Claims

1. A battery cover, characterized in that, include: The cover plate body is provided with an electrode hole and / or a liquid injection hole and / or an explosion-proof valve hole; The edge of the cover plate body is provided with a welding part, and the thickness of the welding part in a first direction is greater than the thickness of the cover plate body. The first direction is the thickness direction of the cover plate body. The welded portion includes a welded surface that extends integrally along the first direction, and the welded surface is located on the side of the welded portion away from the cover plate body; The welded part is integrally formed with the cover plate body through a stamping process.

2. The battery cover according to claim 1, characterized in that: The welded portion includes a protrusion formed by bending or flowing the edge material of the cover plate body through a stamping process, wherein the protrusion direction of the protrusion is parallel to the first direction.

3. The battery cover according to claim 2, characterized in that: A right-angle portion is formed between the outer end face of the welded part and the welded surface.

4. The battery cover according to claim 3, characterized in that: The thickness of the welded portion in the first direction is greater than or equal to 1 mm, and / or the height of the welded surface in the first direction is greater than or equal to 0.8 mm.

5. The battery cover according to claim 3, characterized in that: The width of the welded portion in the second direction is greater than or equal to 0.3 mm. The second direction is parallel to the surface of the cover plate body and perpendicular to the edge of the cover plate body. The thickness of the cover plate body is less than or equal to 3 mm. The width of the welded portion in the second direction is less than the thickness of the cover plate body.

6. The battery cover according to any one of claims 3 to 5, characterized in that: The protrusion is formed by bending the edge material of the cover plate body outward from the cover plate body. The protrusion and the outer surface of the cover plate body, as well as the welding surface and the inner surface of the cover plate body, are smoothly connected by rounded corners. The protrusion height of the protrusion relative to the outer surface of the cover plate body is greater than or equal to 0.3 mm; the radius of the rounded corner is greater than or equal to 0.2 mm.

7. The battery cover according to any one of claims 3 to 5, characterized in that: The protrusion is formed by bending the edge material of the cover plate body towards the inside of the cover plate body. The edge of the outer surface of the cover plate body is provided with a stamped recess. The recess and the welding surface form a right angle. The protrusion and the inner surface of the cover plate body are smoothly connected by a rounded corner. The protrusion height of the protrusion relative to the inner surface of the cover plate body is greater than or equal to 0.3 mm; the sinking depth of the recessed portion relative to the outer surface of the cover plate body is greater than or equal to 0.1 mm; the width of the recessed portion in a second direction is greater than or equal to 0.3 mm; the second direction is parallel to the plate surface of the cover plate body and perpendicular to the edge of the cover plate body; the radius of the rounded corner is greater than or equal to 0.2 mm.

8. The battery cover according to any one of claims 3 to 5, characterized in that: The inner surface and / or outer surface of the cover plate body is provided with a stamping groove near the edge. The height of the groove wall on the side away from the center of the cover plate body is greater than the height of the groove wall on the side near the center of the cover plate body. The groove wall on the side away from the center of the cover plate body forms the protrusion. The protrusion is smoothly connected to the bottom of the stamping groove through a rounded corner. The depth of the stamping groove is greater than or equal to 0.2 mm, the width of the stamping groove in the second direction is greater than or equal to 0.3 mm, the second direction is parallel to the surface of the cover plate body and perpendicular to the edge of the cover plate body, and the radius of the rounded corner is greater than or equal to 0.2 mm.

9. The battery cover according to any one of claims 3 to 5, characterized in that: The edge of the cover plate body is formed with an arched part by a stamping process. The arched part has a convex part on the inner side in the first direction and a concave part on the outer side in the first direction. The side wall of the concave part away from the center of the cover plate body forms the convex part. The bottom surface of the convex part and the concave part, as well as the welding surface and the inner end surface of the convex part, are smoothly connected by rounded corners. The center thickness of the arched portion is less than the thickness of the cover plate body; the protrusion height of the convex portion relative to the inner surface of the cover plate body is greater than or equal to 0.5 mm; the depth of the concave portion is greater than or equal to 0.3 mm; the width of the concave portion in a second direction is greater than or equal to 0.5 mm; the second direction is a direction parallel to the plate surface of the cover plate body and perpendicular to the edge of the cover plate body; the radius of the rounded corner portion is greater than or equal to 0.2 mm.

10. A single-cell battery, characterized in that, Includes the battery cover as described in any one of claims 1 to 9.

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