Battery top cover and battery
By setting a limit structure between the pole pillar and the connecting block of the lithium battery ceiling, the problem of insufficient torque and thrust resistance in the prior art is solved, and the safety and production efficiency of the battery are improved.
Patent Information
- Application Number
- CN202323647878.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2033-12-29
AI Technical Summary
The existing lithium battery ceiling is insufficient to resist torque and thrust in a high-strength environment, resulting in deformation and cracking between the pole column and the riveted block, affecting the safety of the battery.
A battery cover is designed, by providing a limiting structure between the pole pillar and the connecting block, including a first limiting structure and a second limiting structure, to ensure a firm connection between the pole pillar and the connecting block in multiple directions. Improve structural strength and position the pole column during riveting to reduce the extrusion of the insulating member.
It improves the torsion and thrust resistance of the battery cover, prevents the insulator from deforming and cracking, enhances the safety of the battery, and simplifies the production process, which is suitable for large-scale automated production.
Smart Images
Figure CN222282125U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power batteries, in particular to a battery top cover and a battery. Background Art
[0002] With the development of modern society and the enhancement of people's environmental awareness, more and more devices choose lithium batteries as power sources, which provides a broad space for the application and development of lithium batteries. As an important component of lithium batteries, the top cover generally includes a top cover sheet, an explosion-proof valve, a liquid injection hole, a positive pole column and a negative pole column. Among them, the pole is a component that conducts the inside and outside of the lithium battery. One end of it is connected to the external circuit of the lithium battery, and the other end is connected to the battery cell inside the lithium battery to realize the charging and discharging function of the battery; when assembling the battery, the positive pole column needs to pass through the top cover sheet and connect to the positive pole ear of the battery cell; the negative pole column needs to pass through the top cover sheet and connect to the negative pole ear of the battery cell; and the assembly function requirements of lithium batteries for poles are mainly to ensure the reliability of poles and top cover sheets.
[0003] At present, the top cover sheet and the pole are mostly fixed by riveting structure, and a riveting block is set between the pole and the top cover sheet, and the pole and the top cover sheet are closely matched through the riveting process. The riveting block of the existing structure is in plane contact with the flange of the pole, which can meet the use requirements under normal circumstances. However, the top cover of this structure has low strength in torsion and thrust resistance and cannot meet the high-intensity use environment. When the pole is riveted, the flange of the pole is compressed and expanded. Since there is no positioning structure between the pole and the riveting block, when the size of the pole increases, it will squeeze the upper insulation outward and deform or even crack, affecting the safety of the battery. Utility Model Content
[0004] The utility model aims to provide a battery top cover with higher torsion resistance and thrust strength, so as to enhance the stability of the connection between the pole and the connecting block and ensure the safety of the battery.
[0005] According to one aspect of the utility model, the following technical solution is adopted:
[0006] A battery top cover comprises a top cover sheet, a connecting block and a pole, wherein the top cover sheet is provided with a pole hole; the connecting block is arranged on the top cover sheet and corresponds to the pole hole; the pole is passed through the pole hole, and the pole is riveted to the connecting block; wherein a first limiting structure is formed on the outer wall surface of the pole, and a second limiting structure is formed on the inner wall surface of the connecting block, and the first limiting structure and the second limiting structure cooperate to achieve the limiting of the pole and the connecting block in a first direction and / or a second direction, wherein the first direction is the plug-in direction of the pole and the pole hole, and the second direction is perpendicular to the first direction.
[0007] Preferably, the connecting block is provided with a first hole and a second hole connected in a step shape, a step surface is formed at the connection between the first hole and the second hole, and the pole includes a first part penetrating the first hole; the first limiting structure includes a first limiting part formed on the bottom surface of the first part, the second limiting structure includes a second limiting part formed on the step surface, the first limiting part and the second limiting part cooperate to form a bottom limiting structure, and the bottom limiting structure is used for limiting in the second direction; and / or, the first limiting structure includes a third limiting part formed on the first side wall surface of the first part, the second limiting structure includes a fourth limiting part formed on the second side wall surface of the first hole, and the third limiting part and the fourth limiting part cooperate to limit in the first direction.
[0008] Preferably, in the second direction, a distance from the bottom limiting structure to the first side wall surface is L, and L is ≥ 0.2 mm.
[0009] Preferably, the battery top cover is provided with a plurality of the bottom limiting structures, and the distance between adjacent bottom limiting structures in the second direction is W, where W≥0.2 mm.
[0010] Preferably, the height of the bottom limiting structure in the first direction is H, and H≥0.2 mm.
[0011] Preferably, the width of the bottom limiting structure in the second direction is F, and F>H.
[0012] Preferably, one of the first limiting portion and the second limiting portion is a first groove structure, and the other is a first boss structure, and the first boss structure is embedded in the first groove structure; and / or, one of the third limiting portion and the fourth limiting portion is a second groove structure, and the other is a second boss structure, and the second groove structure is embedded in the second boss structure.
[0013] Preferably, the first groove structure is an annular groove; and / or, the first boss structure is an annular structure; and / or, the second groove structure is an annular groove; and / or, the second boss structure is an annular structure.
[0014] Preferably, the battery top cover further includes an upper insulating member and a lower insulating member, wherein the upper insulating member is arranged between the connecting block and the top cover sheet, and the lower insulating member is arranged between the pole and the top cover sheet.
[0015] According to another aspect of the utility model, a battery is provided, comprising a battery cell, a shell and the above-mentioned battery top cover, wherein the battery cell is arranged in the shell, and the battery top cover is hermetically connected to the shell.
[0016] Beneficial effects of the utility model:
[0017] The utility model provides a battery top cover, the battery cover plate includes a top cover sheet, a connecting block and a pole, the connecting block is arranged on the top cover sheet, the pole is penetrated through the top cover sheet and riveted with the connecting block, a first limiting structure is arranged on the outer wall surface of the pole, a second limiting structure is arranged on the inner wall surface of the connecting block, the first limiting structure and the second limiting structure cooperate with each other, and can realize the limiting of the pole and the connecting block in the first direction, the second direction or the first direction and the second direction, and improve the structural strength between the connecting block and the pole. When the pole and the connecting block are riveted, the cooperation between the first limiting structure and the second limiting structure can also play a role in positioning the pole, reduce the extrusion of the upper insulating member caused by the expansion and deformation of the pole, prevent the upper insulating member from plastic deformation or even cracking, and improve the safety of the battery cover plate. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the battery top cover provided by the utility model;
[0019] Figure 2 It is a schematic diagram of the connection block of the battery top cover provided by the utility model;
[0020] Figure 3 It is a schematic diagram of the pole of the battery top cover provided by the utility model;
[0021] Figure 4 yes Figure 1 A partial enlarged view of part A.
[0022] In the figure:
[0023] 1. Top cover;
[0024] 2. Connecting block; 21. First hole; 22. Second hole; 23. Second limiting portion; 24. Fourth limiting portion;
[0025] 3. Pole; 31. First part; 32. First limiting part; 33. Third limiting part; 34. Second part; 35. Third part;
[0026] 4. Upper insulating part; 5. Lower insulating part; 6. Sealing ring. DETAILED DESCRIPTION
[0027] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0028] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.
[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0030] like Figure 1 As shown, the utility model proposes a battery top cover, including a top cover sheet 1, a connecting block 2 and a pole 3. The top cover sheet 1 is provided with a pole hole. The connecting block 2 is arranged on the top cover sheet 1 and is arranged corresponding to the pole hole. The pole 3 is inserted into the pole hole, and the pole 3 is riveted to the connecting block 2. Among them, a first limiting structure is formed on the outer wall surface of the pole 3, and a second limiting structure is formed on the inner wall surface of the connecting block 2. The first limiting structure and the second limiting structure cooperate to achieve the limiting of the pole 3 and the connecting block 2 in the first direction, or the first limiting structure and the second limiting structure cooperate to achieve the limiting of the pole 3 and the connecting block 2 in the second direction, or the first limiting structure and the second limiting structure cooperate to achieve the limiting of the pole 3 and the connecting block 2 in both the first direction and the second direction. In this embodiment, the first direction is the plug-in direction of the pole 3 and the pole hole, and the second direction is perpendicular to the first direction.
[0031] The utility model provides a battery top cover, in which a connection block 2 is arranged on a top cover sheet 1, a pole 3 is passed through the top cover sheet 1 and riveted to the connection block 2, and a first limiting structure arranged on the outer wall of the pole 3 and a second limiting structure arranged on the inner wall of the connection block 2 can cooperate with each other to form a firm connection structure, thereby improving the connection strength between the connection block 2 and the pole 3 in the first direction and the second direction, and improving the ability of the battery cover to resist torsion and thrust in the first direction and the second direction, so that the battery cover can meet the use environment with high strength requirements. When riveting the connection block 2 and the pole 3, the first limiting structure and the second limiting structure can also position the connection block 2 and the pole 3, control the deformation degree of the pole 3 during riveting, reduce the extrusion of the connection block 2 on the upper insulating member 4, prevent the upper insulating member 4 from plastic deformation or even cracking and cause failure, and improve the safety of the battery cover.
[0032] As a specific implementation method, Figure 2 and Figure 3 As shown, the connection block 2 is provided with a first hole 21 and a second hole 22 connected in a step shape, and a step surface is formed at the connection of the first hole 21 and the second hole 22. The cross section of the first hole 21 in the first direction is larger than that of the second hole 22. The pole 3 includes a first portion 31 penetrating the first hole 21 and a second portion 34 penetrating the second hole 22. The bottom surface of the first portion 31 is provided with at least one first limiting portion 32, and the step surface of the connection block 2 is provided with at least one second limiting portion 23. Preferably, the first limiting structure includes a first limiting portion 32 formed on the bottom surface of the first portion 31, and the second limiting structure includes two second limiting portions 23 formed on the step surface. The first limiting portion 32 and the second limiting portion 23 are matched one by one to form a bottom limiting structure, and the bottom limiting structure can realize the limiting of the pole 3 and the connection block 2 in the second direction, thereby improving the structural strength of the battery cover in the second direction.
[0033] In some embodiments, one of the first limiting portion 32 and the second limiting portion 23 is a first groove structure, and the other is a first boss structure, and the first boss structure is embedded in the first groove structure. In some embodiments, the first limiting portion 32 is a first boss structure, and the second limiting portion 23 is a first groove structure; in other embodiments, the first limiting portion 32 is a first groove structure, and the second limiting portion 23 is a first boss structure. Preferably, the first groove structure can be an annular groove, and the first boss structure is an annular structure. Of course, the cross-sectional shape of the first boss structure and the first groove structure can be semicircular or polygonal, etc., so that the first boss structure and the first groove structure can be matched and installed.
[0034] As a specific implementation method, continue to refer to Figure 2 and Figure 3The first limiting structure includes a third limiting portion 33 formed on the first side wall surface of the first portion 31, and the second limiting structure includes a fourth limiting portion 24 formed on the second side wall surface of the first hole 21. The third limiting portion 33 and the fourth limiting portion 24 cooperate to achieve the limitation of the connecting block 2 and the pole 3 in the first direction, thereby improving the structural strength of the battery cover in the first direction.
[0035] In some embodiments, one of the third limiting portion 33 and the fourth limiting portion 24 is a second groove structure, and the other is a second boss structure, and the second boss structure is embedded in the second groove structure. In some embodiments, the third limiting portion 33 is a second boss structure, and the fourth limiting portion 24 is a second groove structure; in other embodiments, the third limiting portion 33 is a second groove structure, and the fourth limiting portion 24 is a second boss structure. Preferably, the second groove structure can be an annular groove, and the second boss structure is an annular structure. Of course, the cross-sectional shape of the second boss structure and the second groove structure can be semicircular or polygonal, etc., so that the second boss structure and the second groove structure can be installed in coordination.
[0036] Furthermore, in order to ensure that the structure of the first limiting portion 32 and the second limiting portion 23 can meet the use strength requirements, the size of the bottom limiting structure needs to be described. Figure 4 As shown, the distance from the bottom limit structure to the first side wall of the pole 3 in the second direction is defined as L, and L must satisfy L≥0.2mm. When L<0.2, the distance between the bottom limit structure and the first side wall is too small, so that the first limit part 32 cannot fully cooperate with the second limit part 23, affecting the actual effect of the bottom limit structure. In a specific embodiment, the value of L is 0.2mm; in a specific embodiment, the value of L is 0.3mm; in a specific embodiment, the value of L is 0.4mm; in a specific embodiment, the value of L is 0.5mm; in a specific embodiment, the value of L is 0.6mm.
[0037] When the battery top cover is provided with multiple bottom limiting structures, the bottom limiting structures are arranged in a ring shape around the pole 3, and the distance between adjacent bottom limiting structures in the second direction is W, and W needs to satisfy W≥0.2mm. When W<0.2, the distance between two adjacent bottom limiting structures is too close, and part of the pole 3 and part of the connecting block 2 between the two bottom limiting structures are prone to breakage and failure after wear, affecting the connection between the pole 3 and the connecting block 2. In a specific embodiment, the value of W is 0.2mm; in a specific embodiment, the value of W is 0.3mm; in a specific embodiment, the value of W is 0.4mm; in a specific embodiment, the value of W is 0.5mm; in a specific embodiment, the value of W is 0.6mm.
[0038] Continue to refer to Figure 4, define the height of the bottom limit structure in the first direction as H, and H must satisfy H≥0.2mm. If H<0.2, the fitting height between the first limit part 32 and the second limit part 23 is too small. When the battery cover moves, the first limit part 32 is easy to separate from the second limit part 23, causing the bottom limit structure to fail. In a specific embodiment, the value of H is 0.2mm; in a specific embodiment, the value of H is 0.3mm; in a specific embodiment, the value of H is 0.4mm; in a specific embodiment, the value of H is 0.5mm; in a specific embodiment, the value of H is 0.6mm.
[0039] Furthermore, the width of the bottom limiting structure in the second direction is defined as F, which must satisfy F>H. This configuration makes it easier for the first limiting portion 32 and the second limiting portion 23 to cooperate during installation, thereby reducing the difficulty of assembly.
[0040] Of course, the battery top cover proposed by the utility model also includes an upper insulating member 4, a lower insulating member 5 and a sealing ring 6. The upper insulating member 4 is arranged between the connecting block 2 and the top cover sheet 1, and is used to insulate and seal the connecting block 2 and the top cover sheet 1. The lower insulating member 5 is arranged between the pole 3 and the top cover sheet 1 to insulate the pole 3 and the top cover sheet 1. The pole 3 also includes a third part 35 passed through the pole hole, and the sealing ring 6 is sleeved between the third part 35 and the top cover sheet 1. The pole 3 is passed through the lower insulating member 5, the sealing ring 6, the top cover sheet 1 and the upper insulating member 4 are riveted with the connecting block 2 to complete the assembly of the battery top cover. The assembled battery top cover can resist torsion and thrust in multiple directions, improve the structural strength of the battery top cover, and can also position the pole 3, reduce the extrusion on the upper insulating member 4, and improve the safety and service life of the battery top cover. In addition, since the pole 3 and the connecting block 2 have a high riveting strength, the battery top cover adopting this structure can eliminate the welding process between the pole 3 and the connecting block 2, simplify the production process of the battery top cover, improve the production efficiency, and enable large-scale automated production.
[0041] The utility model also provides a battery, comprising a battery core, a shell and the above-mentioned battery top cover, wherein the battery core is arranged in the shell, and the battery top cover is hermetically connected to the shell. The battery comprises a battery top cover with high structural strength, thereby improving the safety of the battery.
[0042] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.
Claims
1. A battery top cover, characterized in that: include A top cover sheet, wherein the top cover sheet is provided with a pole hole; A connecting block, the connecting block is arranged on the top cover sheet and is arranged corresponding to the pole hole; A pole, the pole is passed through the pole hole, and the pole is riveted to the connecting block; Among them, a first limiting structure is formed on the outer wall surface of the pole, and a second limiting structure is formed on the inner wall surface of the connecting block. The first limiting structure and the second limiting structure cooperate to achieve the limiting of the pole and the connecting block in the first direction and / or the second direction. The first direction is the plug-in direction of the pole and the pole hole, and the second direction is perpendicular to the first direction.
2. The battery top cover according to claim 1, characterized in that: The connection block is provided with a first hole and a second hole connected in a step shape, a step surface is formed at the connection between the first hole and the second hole, and the pole includes a first portion penetrating the first hole; The first limiting structure includes a first limiting portion formed on the bottom surface of the first portion, the second limiting structure includes a second limiting portion formed on the step surface, the first limiting portion and the second limiting portion cooperate to form a bottom limiting structure, and the bottom limiting structure is used for limiting in the second direction; And / or, the first limiting structure includes a third limiting portion formed on the first side wall surface of the first portion, and the second limiting structure includes a fourth limiting portion formed on the second side wall surface of the first hole, and the third limiting portion and the fourth limiting portion are used together for limiting in the first direction.
3. The battery top cover according to claim 2, characterized in that: In the second direction, the distance from the bottom limiting structure to the first side wall surface is L, and L≥0.2 mm.
4. The battery top cover according to claim 2, characterized in that: The battery top cover is provided with a plurality of the bottom limiting structures, and the distance between adjacent bottom limiting structures in the second direction is W, where W≥0.2 mm.
5. The battery top cover according to claim 2, characterized in that: The height of the bottom limiting structure in the first direction is H, where H≥0.2 mm.
6. The battery top cover according to claim 5, characterized in that: The width of the bottom limiting structure in the second direction is F, and F>H.
7. The battery top cover according to claim 2, characterized in that: One of the first limiting portion and the second limiting portion is a first groove structure, and the other is a first boss structure, and the first boss structure is embedded in the first groove structure; And / or, one of the third limiting portion and the fourth limiting portion is a second groove structure, and the other is a second boss structure, and the second groove structure is embedded in the second boss structure.
8. The battery top cover according to claim 7, characterized in that: The first groove structure is an annular groove; And / or, the first boss structure is an annular structure; And / or, the second groove structure is an annular groove; And / or, the second boss structure is an annular structure.
9. The battery top cover according to claim 1, characterized in that: The battery top cover further includes an upper insulating member and a lower insulating member, wherein the upper insulating member is arranged between the connecting block and the top cover sheet, and the lower insulating member is arranged between the pole and the top cover sheet.
10. A battery, characterized in that: The invention comprises a battery cell, a shell and a battery top cover according to any one of claims 1 to 9, wherein the battery cell is arranged in the shell, and the battery top cover is hermetically connected to the shell.