Battery cover and battery
By setting notches and annular grooves in the protruding structure of the battery cover, the problem of uneven force during the folding process of the battery cover is solved, the sealing performance and manufacturing yield of the battery cover are improved, and the safety and reliability of the battery are ensured.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SVOLT ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2026-04-09
- Publication Date
- 2026-06-30
AI Technical Summary
In existing battery cover plates, the protruding structure of the terminal post is subjected to uneven stress during the folding process, which easily leads to forming defects such as cracks and wrinkles, resulting in insufficient sealing performance and affecting the manufacturing yield of the battery cover plate.
Design a battery cover with a notch in the protruding structure of the terminal post. The notch extends axially downward from the end face to be flush with the top of the post body. Combined with an annular groove and optimized insulation structure, it ensures uniform stress release during the folding process and improves the molding quality.
This effectively avoids cracking and wrinkling of the protruding structure, ensures sealing performance, improves the manufacturing yield and overall flatness of the battery cover, and enhances the safety and reliability of the battery.
Smart Images
Figure CN122000569B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power battery technology, and in particular to a battery cover and a battery. Background Technology
[0002] In battery structure design, the battery cover is a core component that ensures the battery's sealing performance and enables current conduction. Its performance directly affects the battery's safety, reliability, and lifespan. A battery cover typically includes the cover body, terminals, and an insulating sealing structure, among which the assembly precision and sealing effect between the terminals and the cover body are particularly critical.
[0003] In related technologies, during assembly, the terminal post can be folded outwards radially along its end by a protruding structure, pressing it firmly against the insulating component and thus fixing the terminal post to the cover plate body. However, the protruding structure is often annular, and during the folding process, the stress on different parts of the annular protrusion is difficult to distribute evenly, easily leading to inconsistent folding angles, edge warping, local wrinkles, or cracks. Consequently, the folded protrusion cannot be pressed flat onto the insulating component, resulting in air leakage and insufficient sealing performance of the cover plate, which is detrimental to improving the manufacturing yield of the battery cover plate. Summary of the Invention
[0004] In view of this, this application aims to provide a battery cover that can improve the forming quality of the folding of the protruding structure on the terminal post and help improve the manufacturing yield of the battery cover.
[0005] To achieve the above objectives, the technical solution of this application is implemented as follows:
[0006] A battery cover includes a cover body having a terminal mounting hole, a terminal disposed in the terminal mounting hole, and a first insulating member, a sealing member, and a second insulating member disposed sequentially between the cover body and the terminal.
[0007] The pole includes a columnar part with a long cross-section, and a base and a protruding structure respectively disposed at both ends of the columnar part. The columnar part is inserted into the polear mounting hole from one side. The base abuts against the second insulating member. The protruding structure can be folded outward radially toward the columnar part and pressed onto the second insulating member.
[0008] The protruding structure has two straight portions and two arc portions arranged opposite to each other. The straight portions and the arc portions are connected end to end in a ring. At least one of the arc portions has a notch. The notch extends downward from the end face of the protruding structure along the axial direction of the column portion, and the bottom wall of the notch is flush with the top of the column portion.
[0009] Furthermore, the pole post has a first symmetry plane that is parallel to the straight portion and perpendicular to the base; the two side walls of the notch are symmetrically arranged about the first symmetry plane.
[0010] Furthermore, on the projection plane perpendicular to the axis of the pole, the outer arc length of the arc portion is M, and the outer arc length corresponding to the projection of the notch is m. The relationship between the two satisfies: K=m / M, 33.3%≤K≤66.7%.
[0011] Furthermore, a groove is provided at the intersection of the protruding structure and the end face of the column portion, and the groove is annular along the inner side of the protruding structure.
[0012] Furthermore, the dimension h of the groove in the axial direction of the pole post is between 0.2 mm and 0.8 mm; and / or, the dimension w of the root of the groove in the direction perpendicular to the axial direction of the pole post is between 0.2 mm and 0.5 mm.
[0013] Furthermore, along the axial direction of the pole post, the outer end face of the folded protrusion structure is coplanar with the top end of the column portion.
[0014] Furthermore, the first insulating member includes a main body portion and a first edge and a second edge disposed on the main body portion; the main body portion abuts against the upper surface of the cover plate body, and the folded protrusion structure is pressed onto the main body portion; the first edge is connected to the inner peripheral side of the main body portion and extends downward along the axial direction of the pole post, the first edge being located between the outer surface of the pole portion and the hole wall of the pole post mounting hole; the second edge is connected to the outer peripheral side of the main body portion and extends upward along the axial direction of the pole post, the second edge surrounding the outer peripheral side of the folded protrusion structure.
[0015] Furthermore, a beveled portion is formed on the surface of the cover plate body that abuts against the first insulating member. The beveled portion surrounds the circumference of the pole mounting hole and slopes from the surface of the cover plate body toward the side where the first insulating member is located. The included angle α between the beveled portion and the surface of the cover plate body satisfies: 0°≤α≤45°.
[0016] Furthermore, a first positioning structure is provided between the cover plate body and the first insulating member; and / or, a second positioning structure is provided between the cover plate body and the second insulating member.
[0017] Compared with related technologies, this application has the following advantages:
[0018] (1) The battery cover plate described in this application has a notch in the annular part of the protruding structure, and the notch extends downward from the end face of the protruding structure along the axial direction of the pole to be flush with the top of the pole. In this way, during the folding process, the notch can provide space for the deformation of the protruding structure, effectively release the stress generated during folding, and avoid defects such as cracking and wrinkling of the arc part due to excessive stress during folding. At the same time, the notch can make the force on each part of the protruding structure more uniform, so that the folded protruding structure can be flatly pressed on the second insulating part, thereby improving the forming quality of the folding of the protruding structure, ensuring the sealing performance of the battery cover plate, and improving the manufacturing yield of the battery cover plate.
[0019] (2) By limiting the two side walls of the notch to be symmetrical about the first symmetrical plane of the pole, the stress release on both sides of the notch is more balanced during the folding process of the protruding structure, avoiding problems such as asymmetrical folding and edge tilting of the protruding structure caused by the offset of the notch, ensuring that the fit between each part of the folded protruding structure and the second insulating part is consistent, thereby further improving the molding quality.
[0020] (3) By limiting the size of the notch, the notch is made wide enough to provide sufficient clearance for deformation when the protruding structure is folded, effectively releasing stress and avoiding molding defects such as cracks and wrinkles. On the one hand, it avoids that the K value is too small, the notch width is insufficient, the stress is not fully released, and there will still be molding quality problems. On the other hand, it avoids that the K value is too large, the notch is too large, which will cause the folded protruding structure to be unable to effectively press the second insulating part, affecting the assembly stability and sealing performance of the pole.
[0021] (4) An annular groove is set at the intersection of the end face of the protruding structure and the column, which helps to reduce the difficulty of flanging and makes the deformation more controllable, avoiding molding defects caused by uneven deformation, and further improving the molding quality of the protruding structure after flanging.
[0022] (5) By limiting the size of the groove on the axis of the pole, a suitable clearance space can be provided for the folding deformation. This avoids the size being too small, which would make it difficult to reduce the difficulty of folding, and avoids the size being too large, which would result in insufficient connection strength between the protruding structure and the pole body, making it easy to break after folding.
[0023] By limiting the dimensions of the root of the groove in the direction perpendicular to the axis of the pole, a suitable clearance space can be provided for the folding deformation, and damage due to stress concentration at the root of the groove can be avoided, thereby ensuring the forming quality of the raised structure after folding.
[0024] Meanwhile, limiting the axial dimensions of the groove and the radial dimensions of the groove root in the pole post can provide suitable clearance for further folding deformation, reduce the difficulty of flanging, avoid damage to the groove root due to stress concentration, and thus better ensure the forming quality of the protruding structure after flanging.
[0025] (6) By making the outer end face of the folded protrusion coplanar with the top of the main body, the upper end face of the pole post can form a flat plane, avoiding assembly interference caused by uneven upper end face, improving the overall flatness of the battery cover, and providing convenience for subsequent battery assembly.
[0026] (7) By optimizing the structure of the first insulating component, the first edge is located between the outer surface of the column and the wall of the electrode mounting hole, which can effectively isolate the electrode and the cover body and avoid short circuit between them; and the second edge surrounds the outer periphery of the folded protrusion structure, which can also effectively isolate the protrusion structure and prevent the protrusion structure from being exposed too much and causing electric shock; at the same time, the structure of the first insulating component can also play a good sealing role and can play a radial limiting role for the column and the protrusion structure, effectively limiting the radial displacement of the electrode, thereby improving the insulation performance, sealing performance and assembly stability of the battery cover.
[0027] (8) An inclined surface is provided on the surface of the cover plate body that is connected to the first insulating member, such that the inclined surface surrounds the circumference of the pole mounting hole and limits the angle between the inclined surface and the surface of the cover plate body. In this way, the inclined surface can be used to improve the supporting effect of the cover plate body on the first insulating member and can improve the supporting force of the first insulating member on the folded protruding structure.
[0028] (9) The first positioning structure helps to ensure the assembly accuracy between the first insulating component and the cover plate body, and avoids problems such as offset or misalignment of the first insulating component relative to the cover plate body. The second positioning structure helps to ensure the assembly accuracy between the second insulating component and the cover plate body, and avoids problems such as offset or misalignment of the second insulating component relative to the cover plate body.
[0029] Another object of this application is to provide a battery having a battery cover as described above.
[0030] The battery described in this application, by adopting the aforementioned battery cover plate, can improve the molding quality of the folded protrusion structure, ensure the sealing performance of the battery cover plate, and improve the manufacturing yield of the battery cover plate, thereby helping to improve the production yield and reliability of the battery. Attached Figure Description
[0031] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:
[0032] Figure 1 This is an exploded view of the battery cover plate described in the embodiment of this application;
[0033] Figure 2 This is a first-view structural schematic diagram of the battery cover plate described in an embodiment of this application;
[0034] Figure 3 This is a second-view structural schematic diagram of the battery cover plate described in an embodiment of this application;
[0035] Figure 4 This is a third-view structural schematic diagram of the battery cover plate described in an embodiment of this application;
[0036] Figure 5 for Figure 4 Sectional view from the AA direction;
[0037] Figure 6 for Figure 4 Sectional view from the middle BB direction;
[0038] Figure 7 This is a partial enlarged view of the cover plate body described in the embodiments of this application;
[0039] Figure 8 This is a schematic diagram of the structure of the first insulating element described in the embodiments of this application;
[0040] Figure 9 This is a perspective view of the pole described in the embodiments of this application;
[0041] Figure 10 This is a top view of the pole described in the embodiment of this application;
[0042] Figure 11 This is a perspective view of the battery cover plate in the unfolded state of the protruding structure described in the embodiments of this application;
[0043] Figure 12 This is a top view of the battery cover in the unfolded state of the protruding structure described in the embodiments of this application;
[0044] Figure 13 for Figure 12 CC view section view;
[0045] Figure 14 for Figure 12 DD view section view;
[0046] Explanation of reference numerals in the attached figures:
[0047] 1. Cover plate body; 2. Pole post; 3. First insulating component; 4. Second insulating component; 5. Sealing component; 6. Explosion-proof valve; 7. Explosion-proof valve patch;
[0048] 101. Pole mounting hole; 102. Explosion-proof valve mounting hole; 103. First positioning protrusion ring; 104. Second positioning groove; 105. Beveled surface;
[0049] 201. Column part; 202. Base; 203. Protruding structure; 2030. Notch; 2031. Straight part; 2032. Arc part; 2033. Groove; 30. Through hole for pole post; 301. Main body part; 302. First edge; 303. Second edge; 304. First positioning groove; 401. Through hole; 402. Second positioning protrusion ring; 403. Mounting groove. Detailed Implementation
[0050] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0051] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.
[0052] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0053] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.
[0054] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0055] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.
[0056] An embodiment of the first aspect of this application provides a battery cover that can improve the forming quality of the folding of the protruding structure on the terminal post and help improve the manufacturing yield of the battery cover.
[0057] In battery structure design, the battery cover is a core component that ensures the battery's sealing performance and enables current conduction. Its performance directly affects the battery's safety, reliability, and lifespan. A battery cover typically includes the cover body, terminals, and an insulating sealing structure, among which the assembly precision and sealing effect between the terminals and the cover body are particularly critical.
[0058] In related technologies, during assembly, the terminal post can be folded outwards radially along its end by a protruding structure, pressing it firmly against the insulating component and thus fixing the terminal post to the cover plate body. However, the protruding structure is often annular, and during the folding process, the stress on different parts of the annular protrusion is difficult to distribute evenly, easily leading to inconsistent folding angles, edge warping, local wrinkles, or cracks. Consequently, the folded protrusion cannot be pressed flat onto the insulating component, resulting in air leakage and insufficient sealing performance of the cover plate, which is detrimental to improving the manufacturing yield of the battery cover plate.
[0059] In view of this, in order to overcome the shortcomings of the related technology, the battery cover of this embodiment incorporates... Figures 1 to 14 As shown, the overall design includes a cover plate body 1 with a pole mounting hole 101, a pole 2 disposed in the pole mounting hole 101, and a first insulating member 3, a sealing member 5, and a second insulating member 4 disposed sequentially between the cover plate body 1 and the pole 2.
[0060] The pole post 2 includes a column portion 201 with a long cross-section, and a base 202 and a protrusion structure 203 respectively disposed at both ends of the column portion 201. The column portion 201 is inserted into the pole post mounting hole 101 from one side. The base 202 abuts against the second insulating member 4. The protrusion structure 203 can be folded outward in the radial direction of the column portion 201 and pressed onto the second insulating member 4.
[0061] The protruding structure 203 has two straight portions 2031 and two arc portions 2032 arranged opposite to each other. The straight portions 2031 and the arc portions 2032 are connected end to end in a ring. At least one of the arc portions 2032 has a notch 2030 formed on it. The notch 2030 extends downward from the end face of the protruding structure 203 along the axial direction of the column portion 201, and the bottom wall of the notch 2030 is flush with the top of the column portion 201.
[0062] In this structure, the column part 201 of the pole post 2 adopts a long strip cross-section, which can increase the overcurrent fast charging capability of the pole post 2. Furthermore, by providing a notch 2030 in the annular part of the protruding structure 203, and making the notch 2030 extend downward from the end face of the protruding structure 203 along the axial direction of the pole post 2 to be flush with the top of the column part 201, the notch 2030 can provide space for the deformation of the protruding structure 203 during the folding process, effectively releasing the stress generated during folding, and avoiding defects such as cracking and wrinkling of the arc part 2032 due to excessive stress during folding. At the same time, the notch can make the force on each part of the protruding structure 203 more uniform, so that the folded protruding structure 203 can be flatly pressed on the second insulating member 4, thereby improving the forming quality of the folding of the protruding structure 203, ensuring the sealing performance of the battery cover, and improving the manufacturing yield of the battery cover.
[0063] Based on the above overview, for more details, please refer to... Figures 1 to 14 As shown, the battery cover includes a cover body 1, terminals 2, a first insulating component 3, a sealing component 5, and a second insulating component 4, as well as an explosion-proof valve 6 and an explosion-proof valve patch 7. The cover body 1 has terminal mounting holes 101 and explosion-proof valve mounting holes 102. Both the first insulating component 3 and the second insulating component 4 have terminal through holes 30, and the second insulating component 4 also has a through hole 401 corresponding to the explosion-proof valve mounting hole 102. The sealing component 5 is preferably a sealing ring.
[0064] In terms of overall structure, pole post 2 is composed of Figure 1 Combination Figure 5 , Figure 6 as well as Figure 9 and Figure 10As shown, the pole post 2 includes a column portion 201, and a base 202 and a protruding structure 203 respectively connected to the two axial ends of the main body portion 301. The cross-section of the pole post 2 is elongated, and the protruding structure 203 is elongated and extends from the end of the column portion 201 along the circumference of the column portion 201. Preferably, the pole post 2 in this embodiment is integrally formed, and can be an integrally formed aluminum column or an integrally formed copper column.
[0065] During specific assembly, the post body 201 of the pole post 2 passes sequentially through the pole post through hole 30, the sealing ring, the pole post mounting hole 101, and the pole post through hole 30 on the first insulating member 3 from the side where the second insulating member 4 is located. The base 202 abuts against the second insulating member 4. The protruding structure 203 passes through the pole post through hole 30 on the first insulating member 3 and can be folded outward radially towards the post body 201 and can be pressed onto the second insulating member 4.
[0066] And the protruding structure 203, combined with Figure 9 and Figure 10 As shown, it has two straight portions 2031 and two arc portions 2032 arranged opposite to each other. The straight portions 2031 and the arc portions 2032 are connected end to end in a ring shape. In this embodiment, preferably, notches 2030 are formed on both arc portions 2032. Each notch 2030 extends downward from the end face of the protruding structure 203 along the axial direction of the column portion 201, and the bottom wall of each notch 2030 is flush with the top of the column portion 201.
[0067] At this time, notches 2030 are provided on both arc portions 2032, which allows the arc portions 2032 at both ends of the protruding structure 203 to effectively release the stress generated during the folding process. This allows the folded protruding structure 203, especially the arc portions 2032, to be flatly pressed onto the second insulating member 4, thereby improving the forming quality of the folded protruding structure 203, ensuring the sealing performance of the battery cover, and increasing the yield of the battery cover.
[0068] Continue to combine Figures 3 to 14 As shown, in some exemplary embodiments, for example, the pole post 2 has a first plane of symmetry parallel to the straight portion 2031 and perpendicular to the base 202, while the two side walls of the notch 2030 are symmetrically arranged about the first plane of symmetry. The aforementioned first plane of symmetry is also known as... Figure 3 The section where AA is located. The two side walls of the notch 2030 are symmetrical about the first symmetry plane, which means that the notch 2030 is located in the middle of the arc portion 2032.
[0069] In this way, during the folding process, the stress release on both sides of the notch 2030 of the protruding structure 203 is more balanced, avoiding problems such as asymmetry and edge tilting of the protruding structure 203 due to the offset of the notch 2030. This ensures that the fit between each part of the protruding structure 203 and the second insulating part 4 is consistent after folding, thereby further improving the molding quality.
[0070] Combination Figure 9 and Figure 10 As shown, in some exemplary embodiments, for example, on a projection plane perpendicular to the axis of the pole post 2, the outer arc length of the arc portion 2032 is M, and the outer arc length corresponding to the projection of the notch 2030 is m, and the relationship between the two satisfies: K=m / M, 33.3%≤K≤66.7%.
[0071] At this point, by limiting the size of the notch 2030, it is ensured that the notch 2030 has sufficient width to provide ample space for the deformation of the protruding structure 203 during folding, effectively releasing stress and avoiding molding defects such as cracking and wrinkling. Furthermore, it avoids both situations where the K value is too small, resulting in insufficient width of the notch 2030 and inadequate stress release, which would still lead to molding quality problems; and where the K value is too large, resulting in an excessively large notch 2030, which would prevent the folded protruding structure 203 from effectively pressing the second insulating component 4, affecting the assembly stability and sealing performance of the pole post 2.
[0072] In specific implementations, the ratio K can be set to, for example, 33.3%, 35%, 37%, 40%, 42%, 45%, 47%, 50%, 52%, 55%, 57%, 60%, 62%, 65%, or 66.7%. This ensures both the folding quality of the protruding structure 203 and its effective compression of the second insulating component 4, guaranteeing the sealing performance of the battery cover and improving the yield rate of the battery cover manufacturing process.
[0073] Combination Figures 9 to 14 As shown, in some exemplary embodiments, for example, a groove 2033 is provided at the intersection of the protrusion structure 203 and the end face of the column portion 201, and the groove 2033 is annular along the inner side of the protrusion structure 203.
[0074] In the above form, by setting an annular groove 2033 at the intersection of the end face of the protruding structure 203 and the column part 201, it is not only easier to reduce the difficulty of flanging, but also makes the deformation more controllable, avoiding molding defects caused by uneven deformation, and further improving the molding quality of the protruding structure 203 after flanging.
[0075] In practice, such as Figure 14As shown, the cross-section of the groove 2033 is preferably a right trapezoid, and the height of the right trapezoid is flush with the inner wall of the protrusion structure 203, which facilitates the processing and preparation of the groove 2033.
[0076] Continue to refer to Figure 14 As shown, in some exemplary embodiments, for example, the dimension h of the groove 2033 in the axial direction of the pole post 2 is between 0.2 mm and 0.8 mm, and the dimension w of the root of the groove 2033 in the direction perpendicular to the axial direction of the pole post 2 is between 0.2 mm and 0.5 mm. In specific implementations, the dimension h of the groove 2033 can be set, for example, to 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, or 0.8 mm, etc. The dimension w of the root of the groove 2033 can be set, for example, to 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm.
[0077] At this time, by limiting the size of the groove 2033 on the axis of the pole post 2, a suitable clearance space can be provided for the folding deformation. This avoids the size being too small, which would make it difficult to reduce the difficulty of folding, and avoids the size being too large, which would result in insufficient connection strength between the protruding structure 203 and the column part 201, making it easy to break after folding.
[0078] Furthermore, by limiting the radial dimension of the root of the groove 2033 in the pole post 2, a suitable clearance space can be provided for the folding deformation, and damage to the root of the groove 2033 due to stress concentration can be avoided, thereby ensuring the forming quality of the protruding structure 203 after folding.
[0079] At the same time, limiting the axial dimensions of the groove 2033 and the radial dimensions of the root of the groove 2033 in the pole post 2 can provide suitable clearance space for further folding deformation, reduce the difficulty of flanging, and avoid damage to the root of the groove 2033 due to stress concentration, thereby better ensuring the forming quality of the protrusion structure 203 after flanging.
[0080] It is worth noting that, in the above, in addition to limiting both the axial dimension h of the groove 2033 in the pole post 2 and the radial dimension w of the root of the groove 2033 in the pole post 2, it is also possible to limit only the axial dimension h of the groove 2033 in the pole post 2, or only the radial dimension w of the root of the groove 2033 in the pole post 2.
[0081] Depend on Figure 5 and Figure 6 and combined Figure 13 and Figure 14As shown, in some exemplary embodiments, for example, along the axial direction of the electrode post 2, the outer end face of the folded protrusion 203 is coplanar with the top end of the column portion 201. This arrangement allows the upper end face of the electrode post 2 to form a flat plane, avoiding assembly interference problems caused by unevenness of the upper end face, improving the overall flatness of the battery cover, and facilitating subsequent battery assembly.
[0082] Combination Figures 1 to 8 As shown, in some exemplary embodiments, for example, the first insulating member 3 includes a main body 301, and a first edge 302 and a second edge 303 disposed on the main body 301. The main body 301 abuts against the upper surface of the cover plate body 1, and the folded protrusion 203 presses against the main body 301.
[0083] The first edge 302 is connected to the inner peripheral side of the main body 301 and extends downward along the axial direction of the pole post 2. The first edge 302 is located between the outer surface of the pole body 201 and the wall of the pole post mounting hole 101. The second edge 303 is connected to the outer peripheral side of the main body 301 and extends upward along the axial direction of the pole post 2. The second edge 303 surrounds the outer peripheral side of the folded protrusion structure 203.
[0084] In the above structure, by optimizing the structure of the first insulating member 3, the first edge 302 is located between the outer surface of the column portion 201 and the wall of the pole mounting hole 101, which can effectively isolate the pole 2 from the cover plate body 1 and prevent short circuits between them. Furthermore, the second edge 303 surrounds the outer periphery of the folded protruding structure 203, which can also effectively isolate the protruding structure 203 and prevent excessive exposure of the protruding structure 203 from causing electric shock.
[0085] Meanwhile, the structure of the first insulating component 3 can also play a good sealing role and can play a radial limiting role for the column part 201 and the protruding structure 203, effectively limiting the radial displacement of the pole post 2, thereby improving the insulation performance, sealing performance and assembly stability of the battery cover.
[0086] It should be noted that the first insulating component 3 in this embodiment is an integrally molded injection molded part, which can improve the connection strength between the main body 301, the first edge 302 and the second edge 303, and the production method of the first insulating component 3 is relatively simple and the cost is low.
[0087] Combination Figures 1 to 6As shown, in some exemplary embodiments, for example, the second insulating member 4 is provided with a mounting groove 403 communicating with the pole through hole 30, the aforementioned base 202 is provided in the mounting groove 403, and in the thickness direction of the cover plate body 1, the size of the base 202 is larger than the size of the mounting groove 403, and has an exposed end located outside the mounting groove 403.
[0088] At this time, the mounting groove 403 can position the base 202 of the pole post 2, ensuring the assembly accuracy of the pole post 2 and providing a more accurate positioning for the subsequent flanging forming of the protruding structure 203, thereby further improving the flanging forming quality of the protruding structure 203. At the same time, it makes the base 202 have an exposed end located outside the mounting groove 403, which facilitates the welding connection between the base 202 and the electrode tab inside the battery.
[0089] Combination Figure 7 and Figure 14 As shown, in some exemplary embodiments, for example, a beveled portion 105 is formed on the surface of the cover plate body 1 that abuts against the first insulating member 3. The beveled portion 105 surrounds the circumference of the pole mounting hole 101 and slopes from the surface of the cover plate body 1 toward the side where the first insulating member 3 is located. Moreover, the included angle α between the beveled portion 105 and the surface of the cover plate body 1 satisfies: 0°≤α≤45°. This configuration can enhance the support of the cover plate body 1 for the first insulating member 3 using the beveled portion 105, and can also increase the support strength of the first insulating member 3 for the folded-up protrusion structure 203, preventing the force exerted on the first insulating member 3 by the folded-up protrusion structure 203 from damaging the first insulating member 3.
[0090] In specific implementations, the included angle between the inclined surface 105 and the surface of the cover body 1 can be set to, for example, 0°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, or 45°. When the included angle α is set to 0°, that is, the surfaces of the inclined surface 105 and the cover body 1 are coplanar, this setting is also acceptable. Furthermore, corresponding to the inclined surface 105, the first insulating member 3 has a recessed portion that fits against the inclined surface 105, so that the first insulating member 3 and the cover body 1 can fit and connect better, and this helps to improve the sealing performance of the battery cover.
[0091] In addition, combined Figures 5 to 8 As shown, in some exemplary embodiments, for example, a first positioning structure is provided between the cover plate body 1 and the first insulating member 3, and a second positioning structure is also provided between the cover plate body 1 and the second insulating member 4.
[0092] The first positioning structure in this embodiment helps ensure the assembly accuracy between the first insulating component 3 and the cover plate body 1, avoiding problems such as offset or misalignment of the first insulating component 3 relative to the cover plate body 1. The second positioning structure, on the other hand, helps ensure the assembly accuracy between the second insulating component 4 and the cover plate body 1, avoiding problems such as offset or misalignment of the second insulating component 4 relative to the cover plate body 1.
[0093] Specifically, the aforementioned first positioning structure includes, for example, a first positioning protrusion 103 disposed on one of the cover plate body 1 and the first insulating member 3, and a first positioning groove 304 disposed on one of the cover plate body 1 and the first insulating member 3, with the first positioning protrusion 103 located in the first positioning groove 304. Through the insertion and engagement of the first positioning protrusion 103 and the first positioning groove 304, the assembly accuracy of the first insulating member 3 on the cover plate body 1 can be improved. Furthermore, the structure of the first positioning protrusion 103 and the first positioning groove 304 is relatively simple and easy to manufacture.
[0094] In this embodiment, for example, a first positioning protrusion 103 is formed on the upper surface of the cover plate body 1, and a first positioning groove 304 is formed on the lower surface of the main body 301 of the first insulating member 3. When the first insulating member 3 is assembled, the first positioning protrusion can be positioned in the first positioning groove 304, thereby realizing the positioning of the first insulating member 3 on the cover plate body 1.
[0095] The aforementioned second positioning structure includes, for example, a second positioning protrusion 402 disposed on one of the cover plate body 1 and the second insulating member 4, and a second positioning groove 104 disposed on one of the cover plate body 1 and the second insulating member 4, with the second positioning protrusion 402 located in the second positioning groove 104. The insertion and engagement of the second positioning protrusion 402 and the second positioning groove 104 improves the assembly accuracy of the second insulating member 4 on the cover plate body 1. Furthermore, the structure of the second positioning protrusion 402 and the second positioning groove 104 is relatively simple and easy to manufacture.
[0096] In this embodiment, for example, a second positioning groove 104 is formed on the lower surface of the cover plate body 1, and a second positioning protrusion is formed on the upper surface of the second insulating member 4. When the second insulating member 4 is assembled, the second positioning protrusion can be positioned in the second positioning groove 104, thereby realizing the positioning of the second insulating member 4 on the cover plate body 1.
[0097] It is worth noting that, regarding the battery cover of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still made by... Figures 1 to 14As shown, it may include, for example, a cover plate body 1 having a pole mounting hole 101, a pole 2 disposed in the pole mounting hole 101, and a first insulating member 3, a sealing member 5, and a second insulating member 4 disposed sequentially between the cover plate body 1 and the pole 2.
[0098] The pole post 2 includes a cylindrical portion 201 with an elongated cross-section, and a base 202 and a protruding structure 203 respectively disposed at both axial ends of the cylindrical portion 201. The cylindrical portion 201 is inserted into the pole post mounting hole 101 from one side. The base 202 abuts against the second insulating member 4. The protruding structure 203 can be folded outward radially toward the cylindrical portion 201 and pressed onto the second insulating member 4. The protruding structure 203 has two straight portions 2031 and two arc portions 2032 arranged opposite to each other. The straight portions 2031 and the arc portions 2032 are connected end to end in a ring shape. Each arc portion 2032 has a notch 2030 formed on it. Each notch 2030 extends downward along the axial direction of the cylindrical portion 201 from the end face of the protruding structure 203, and the bottom wall of each notch 2030 is flush with the top of the cylindrical portion 201.
[0099] The pole post 2 has a first symmetry plane that is parallel to the straight portion 2031 and perpendicular to the base 202. The two side walls of the notch 2030 are symmetrically arranged about the first symmetry plane. Furthermore, on the projection plane perpendicular to the axis of the pole post 2, the outer arc length of the arc portion 2032 is M, and the outer arc length corresponding to the projection of the notch 2030 is m. The relationship between the two satisfies: K=m / M, 33.3%≤K≤66.7%.
[0100] A groove 2033 is provided at the intersection of the protruding structure 203 and the end face of the column portion 201. The groove 2033 is annular along the inner side of the protruding structure 203. Furthermore, the dimension h of the groove 2033 in the axial direction of the pole post 2 is between 0.2mm and 0.8mm, and the dimension w of the root of the groove 2033 in the direction perpendicular to the axial direction of the pole post 2 is between 0.2mm and 0.5mm.
[0101] The first insulating member 3 includes a main body 301 and a first edge 302 and a second edge 303 disposed on the main body 301. The main body 301 abuts against the upper surface of the cover plate body 1, and the folded protrusion 203 is pressed onto the main body 301. The first edge 302 is connected to the inner peripheral side of the main body 301 and extends downward along the axial direction of the pole post 2, and is located between the outer surface of the pole post 201 and the wall of the pole post mounting hole 101. The second edge 303 is connected to the outer peripheral side of the main body 301 and extends upward along the axial direction of the pole post 2, and surrounds the outer peripheral side of the folded protrusion 203.
[0102] The second insulating member 4 is provided with a mounting groove 403 that communicates with the pole through hole 30. The base 202 is located in the mounting groove 403. In the thickness direction of the cover plate body 1, the size of the base 202 is larger than the size of the mounting groove 403, and it has an exposed end located outside the mounting groove 403.
[0103] Among them, a beveled portion 105 is formed on the surface of the cover plate body 1 that abuts against the first insulating member 3. The beveled portion 105 surrounds the periphery of the pole mounting hole 101 and is inclined from the surface of the cover plate body 1 toward the side where the first insulating member 3 is located. The included angle α between the beveled portion 105 and the surface of the cover plate body 1 is 30°.
[0104] The cover plate body 1 has a first positioning protrusion 103 formed on its upper surface, and a first positioning groove 304 formed on its lower surface of the main body 301 of the first insulating member 3. The first positioning protrusion can be positioned in the first positioning groove 304. Furthermore, the cover plate body 1 has a second positioning groove 104 formed on its lower surface, and the second insulating member 4 has a second positioning protrusion formed on its upper surface. The second positioning protrusion can be positioned in the second positioning groove 104.
[0105] In the preferred embodiment of the battery cover above, the specific configuration and arrangement of the protrusion structure 203, groove 2033, pole post 2, first insulating member 3 and second insulating member 4, etc., can still be referred to the description in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the protrusion structure 203, groove 2033, pole post 2, first insulating member 3 and second insulating member 4, etc., can also be referred to the description in the above exemplary embodiments.
[0106] The battery cover of this embodiment adopts the above design. By providing a notch 2030 in the annular portion of the protruding structure 203, it can provide space for the deformation of the protruding structure 203, effectively release the stress generated during folding, and avoid defects such as cracking and wrinkling of the arc portion 2032 due to excessive stress during folding. At the same time, the notch 2030 can make the force on each part of the protruding structure 203 more uniform, so that the folded protruding structure 203 can be flatly pressed on the second insulating member 4, thereby improving the forming quality of the folding of the protruding structure 203, ensuring the sealing performance of the battery cover, and improving the manufacturing yield of the battery cover.
[0107] The following examples and comparative models verify the relevant dimensional design of the protrusion structure 203 and groove 2033 on the above-mentioned pole post. Among them, the appearance judgment criteria of the protrusion structure 203 of the pole post 2 after flanging include: a) whether there are micro-cracks at the arc R corner and at the root of the flanging; b) whether the rolled edge structure is fully flanged and whether it is tightly attached to the upper plastic; c) whether the flatness of the upper surface of the pole post 2 after flanging is less than 0.3mm.
[0108] The criteria for judging the sealing performance of the cover plate after the raised structure 203 of the pole post 2 is flanged include: the pole post 2 maintains pressure for 30 seconds without leakage at 1.2 MPa pressure from the inside out and at 0.3 MPa pressure from the outside in, and the leakage rate is <1×10⁻⁶ when detected by helium mass spectrometry. -7 / Pa.m 3 / s.
[0109] Table 1
[0110]
[0111]
[0112] An embodiment of the second aspect of this application provides a battery having a battery cover as described above. Specifically, the battery includes a housing with an opening, and an electrode assembly is disposed within the housing. The aforementioned battery cover seals the opening and is welded to the housing.
[0113] In this embodiment, by adopting the battery cover plate described above, the molding quality of the folding of the protruding structure 203 can be improved, the sealing performance of the battery cover plate can be guaranteed, and the manufacturing yield of the battery cover plate can be improved, thereby helping to improve the production yield and reliability of the battery.
[0114] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.
Claims
1. A battery cover, characterized in that: It includes a cover plate body with a pole mounting hole, a pole disposed in the pole mounting hole, and a first insulating member, a sealing member and a second insulating member disposed sequentially between the cover plate body and the pole. The pole includes a columnar part with a long cross-section, and a base and a protruding structure respectively disposed at both ends of the columnar part. The columnar part is inserted into the polear mounting hole from one side. The base abuts against the second insulating member. The protruding structure can be folded outward radially toward the columnar part and pressed onto the second insulating member. The protruding structure has two straight portions and two arc portions arranged opposite to each other. The straight portions and the arc portions are connected end to end in a ring shape. At least one of the arc portions has a notch. The notch extends downward from the end face of the protruding structure along the axial direction of the column portion, and the bottom wall of the notch is flush with the top of the column portion. On the projection plane perpendicular to the axis of the pole post, the outer arc length of the arc portion is M, and the outer arc length corresponding to the projection of the notch is m. The relationship between the two satisfies: K=m / M, 33.3%≤K≤66.7%; A groove is provided at the intersection of the protruding structure and the end face of the column part, and the groove is annular along the inner side of the protruding structure; The dimension h of the groove in the axial direction of the pole post is between 0.2 mm and 0.8 mm; and / or, the dimension w of the root of the groove in the direction perpendicular to the axial direction of the pole post is between 0.2 mm and 0.5 mm.
2. The battery cover according to claim 1, characterized in that: The pole post has a first symmetry plane that is parallel to the straight portion and perpendicular to the base; The two side walls of the notch are symmetrically arranged about the first symmetrical surface.
3. The battery cover according to claim 1, characterized in that: Along the axial direction of the pole post, the outer end face of the folded protrusion structure is coplanar with the top end of the column body.
4. The battery cover according to claim 1, characterized in that: The first insulating member includes a main body portion, and a first edge and a second edge disposed on the main body portion; The main body abuts against the upper surface of the cover plate body, and the folded-over protruding structure presses onto the main body; The first edge is connected to the inner peripheral side of the main body and extends downward along the axial direction of the pole post. The first edge is located between the outer surface of the pole body and the wall of the pole post mounting hole. The second edge is connected to the outer peripheral side of the main body and extends upward along the axial direction of the pole post. The second edge surrounds the outer peripheral side of the folded protrusion structure.
5. The battery cover according to claim 1, characterized in that: A beveled portion is formed on the surface of the cover plate body that abuts against the first insulating member. The beveled portion surrounds the circumference of the pole mounting hole and slopes from the surface of the cover plate body toward the side where the first insulating member is located. The included angle α between the inclined surface and the surface of the cover plate body satisfies: 0°≤α≤45°.
6. The battery cover according to any one of claims 1 to 5, characterized in that: A first positioning structure is provided between the cover plate body and the first insulating component; and / or, A second positioning structure is provided between the cover plate body and the second insulating component.
7. A battery, characterized in that: The battery is provided with a battery cover plate as described in any one of claims 1 to 6.