End plate for cylindrical battery cap, cylindrical battery cap and battery
By adjusting the tilt angle of the convex bulge of the cylindrical battery cap and setting the venting gap, the deformation problem of the welded piece during the welding process was solved, thereby improving the strength of the welded piece and the safety of the battery.
Patent Information
- Application Number
- CN202520103993.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-16
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-01-16
AI Technical Summary
In the prior art, the battery cap is prone to deformation when welding the busbar, which leads to the risk of poor soldering and missing soldering, affecting the series and parallel connection effect of the battery.
A cylindrical battery cap was designed, comprising a plastic ring, a safety valve, a positioning ring, a welding piece, and a convex bulge. The strength of the welding piece is enhanced by adjusting the tilt angle α of the convex bulge to be between 90-140°, and an venting gap is left between the positioning ring and the welding piece. The safety valve and the positioning ring are wrapped by the deformation of the outer shell.
This improves the strength of the welded sheet, prevents deformation during welding, ensures welding quality, and enhances battery safety and welding yield.
Smart Images
Figure CN223771198U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of cylindrical battery technology, specifically relating to the end cap of a battery, and more particularly to an end plate for a cylindrical battery cap, a cylindrical battery cap, and a battery. Background Technology
[0002] Once the battery cap is attached to the battery body, it creates a sealed space inside the battery body, preventing leakage of internal materials and blocking external moisture, dust, and other contaminants from entering the battery and affecting its performance and safety.
[0003] In related technologies, when the caps are welded to the busbars, the end plates are not strong enough and are prone to deformation, which can lead to the risk of incomplete welding or missing welding. This can result in inconsistent busbar heights on each cap, making it impossible to connect batteries in series or in parallel.
[0004] Therefore, how to solve the technical problem of the cap easily deforming when welding the busbar is a problem that urgently needs to be solved by those skilled in the art.
[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content
[0006] This disclosure provides at least one end plate for a cylindrical battery cap, a cylindrical battery cap, and a battery.
[0007] In a first aspect, embodiments of this disclosure provide a cylindrical battery cap, comprising: a plastic ring with an inner wall protruding to form a first mounting position; a safety valve disposed on the first mounting position of the plastic ring; and an end plate disposed on the safety valve, comprising: a positioning ring, a welding piece, and at least two protrusions, wherein the positioning ring is fitted with the safety valve, and the protrusions connect the positioning ring and the welding piece, leaving an exhaust gap between them; wherein the plastic ring is adapted to inwardly wrap the safety valve and the positioning ring by deformation of the outer shell; the ratio of the width D1 of the positioning ring to the diameter D2 of the end plate is between 0.15 and 0.26; and the tilt angle α of the protrusions is between 90 and 140°.
[0008] In one optional embodiment, the ratio of the width D1 of the positioning ring to the diameter D2 of the end plate is between 0.18 and 0.20; the tilt angle α of the convex hull is between 120 and 140°.
[0009] In one optional embodiment, the safety valve has an upward-facing flange for guiding the placement of the positioning ring; the ratio of the height H1 of the flange to the thickness H2 of the positioning ring is between 0.4 and 0.6.
[0010] In one optional embodiment, the welding piece is coaxial with the positioning ring and located above the positioning ring; the height H3 of the venting gap is between 0.5mm and 0.8mm.
[0011] In one optional embodiment, the lower surface of the safety valve is provided with a recessed platform; the height H4 of the recessed platform is between 0.45mm and 0.6mm.
[0012] In one optional embodiment, the cylindrical battery cap further includes: a base plate; the base plate is connected to the recessed platform, and a rubber ring is provided between the base plate and the recessed platform.
[0013] Secondly, embodiments of this disclosure also provide an end plate for a cylindrical battery cap, comprising: a positioning ring; a welding piece; and at least two protrusions, wherein the two ends of the protrusions are respectively connected to the positioning ring and the welding piece, and an exhaust gap is provided between the positioning ring and the welding piece; wherein the ratio of the width D1 of the positioning ring to the diameter D2 of the end plate is between 0.15 and 0.26, preferably between 0.18 and 0.20; and the tilt angle α of the protrusions is between 90 and 140°.
[0014] In one alternative embodiment, the tilt angle α of the convex hull is between 120 and 140°.
[0015] In one optional embodiment, the welding piece is coaxial with the positioning ring and located above the positioning ring; the height H3 of the venting gap is between 0.5mm and 0.8mm.
[0016] Thirdly, embodiments of this disclosure also provide a battery, including: a cylindrical battery cap; a housing with an inner wall protruding to form a second placement position for placing the cylindrical battery cap; wherein the housing is configured to deform a plastic ring of the cylindrical battery cap to inwardly wrap around a safety valve and a positioning ring.
[0017] The beneficial effect of this utility model is that by changing the end plate of the cylindrical battery cap, the cylindrical battery cap and the battery, the tilt angle α of the convex bulge used to connect the positioning ring and the welding piece is located between 90-140°, so as to improve the strength of the welding piece while ensuring the welding area of the welding piece and prevent the welding piece from deforming under stress during the welding process.
[0018] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.
[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description
[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0021] Figure 1 This is a cross-sectional view of a cylindrical battery cap provided in an embodiment of the present disclosure;
[0022] Figure 2 A three-dimensional structural schematic diagram of a cylindrical battery cap provided in an embodiment of this disclosure;
[0023] Figure 3 This is a cross-sectional structural diagram of a battery provided in an embodiment of the present disclosure;
[0024] Figure 4 This is a cross-sectional structural diagram of a sinkhole provided in an embodiment of the present disclosure.
[0025] In the picture:
[0026] Plastic ring 1, first placement position 11;
[0027] Safety valve 2, flange 21, countersunk platform 22;
[0028] End plate 3, positioning ring 31, welding piece 32, protrusion 33, venting gap 34;
[0029] 4. Outer shell; 5. Base plate; 6. Rubber ring;
[0030] The width of the positioning ring is D1, the diameter of the end plate is D2, the inclination angle of the convex bulge is α, the height of the flange is H1, the thickness of the positioning ring is H2, the height of the exhaust gap is H3, and the height of the recess is H4. Detailed Implementation
[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0032] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the figures, the thickness of parts may be exaggerated or reduced for the purpose of effectively depicting the technical content.
[0033] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0034] like Figures 1 to 3 As shown, at least one embodiment provides a cylindrical battery cap, including: a plastic ring 1, a safety valve 2, an end plate 3, a base plate 5, and a rubber ring 6.
[0035] like Figure 1 As shown, in some embodiments, the inner wall of the plastic ring 1 protrudes to form a first placement position 11. Optionally, the first placement position 11 is an annular protrusion arranged around the circumference of the plastic ring 1, which serves to support the safety valve 2.
[0036] like Figure 1 As shown, in some embodiments, the safety valve 2 is disposed on the first placement position 11, and its function is to release pressure by breaking when the pressure inside the battery exceeds a threshold.
[0037] In related technologies, during the welding process between end plate 3 and busbar, end plate 3 often deforms due to insufficient strength, which can lead to the risk of incomplete welding or missing welding, resulting in inconsistent heights of each busbar.
[0038] To solve the above problems, such as Figure 1 , Figure 2 As shown, in some embodiments, the end plate 3 is mounted on the safety valve 2, with its lower end face fitting against the safety valve 2 and its upper end face needing to be welded to the manifold.
[0039] Specifically, the end plate 3 includes: a positioning ring 31, a welding piece 32, and at least two protrusions 33. The protrusions 33 connect the positioning ring 31 and the welding piece 32 and leave an exhaust gap 34 between the positioning ring 31 and the welding piece 32. The positioning ring 31 is in contact with the safety valve 2, and the welding piece 32 is used for welding with the manifold.
[0040] In this embodiment, after the safety valve 2 and the end plate 3 are placed on the first placement position 11 of the plastic ring 1, the plastic ring 1 needs to be placed in the second placement position 41 of the outer shell 4. Then, the deformation of the outer shell 4 causes the plastic ring 1 to wrap around the positioning ring 31 of the safety valve 2 and the end plate 3 inward. Therefore, the positioning ring 31 needs a certain width to be pressed by the plastic ring 1.
[0041] like Figure 1As shown, in some embodiments, the ratio of the width D1 of the positioning ring 31 to the diameter D2 of the end plate 3 is between 0.15 and 0.26, preferably between 0.18 and 0.20.
[0042] In this embodiment, the width D1 of the positioning ring 31 ensures that a sufficient area is covered by the plastic ring 1.
[0043] like Figure 1 As shown, in some embodiments, the welding piece 32 is coaxial with the positioning ring 31 and is located above the positioning ring 31; in order to facilitate the demolding of the end plate 3, the welding piece 32 can only be in the central area of the positioning ring 31 and cannot coincide with the positioning ring 31; at the same time, the size of the tilt angle α of the convex hull 33 determines the size of the welding piece 32.
[0044] like Figure 1 As shown, in some embodiments, the tilt angle α of the convex hull 33 is between 90 and 140°.
[0045] Preferably, the tilt angle α of the convex hull 33 is between 120-140°.
[0046] In this embodiment, when the tilt angle α of the convex humb 33 is less than 90°, the mold cannot be demolded after it is made, making mold opening and production impossible, and mass production is not possible. When the tilt angle α of the convex humb 33 is greater than 140°, the strength of the convex humb 33 weakens. When welding the busbar, the convex humb 33 is prone to collapse when the tooling fixture presses down with a certain force. Welding the busbar will cause problems such as incomplete welding and explosion points, resulting in a decrease in welding yield, increased difficulty in assembling the module, a decrease in yield, and an increase in time cost. When the tilt angle α of the convex humb 33 is between 90° and 140°, not only is the strength of the convex humb 33 guaranteed, but also sufficient weldable area is provided for welding the busbar, i.e., the area of the welding piece 32.
[0047] like Figure 3 As shown, in some embodiments, the outer edge of the safety valve 2 is provided with an upward flange 21 for guiding the placement of the positioning ring 31.
[0048] In this embodiment, the inner diameter of the flange 21 is slightly larger than the diameter of the positioning ring 31. At this time, the flange 21 serves as a guide for the placement of the end plate 3, greatly improving the assembly speed. At the same time, the contact area between the positioning ring 31 and the safety valve 2 is greatly increased, dispersing some of the overcurrent and preventing the overcurrent temperature rise at the welding point from rising too high. This reduces the high-temperature aging time of the outer plastic ring 1 and improves the safety performance of the battery.
[0049] like Figure 3 As shown, in some embodiments, the ratio of the height H1 of the flange 21 to the thickness H2 of the positioning ring 31 is between 0.4 and 0.6; preferably, the ratio is 0.5.
[0050] In this embodiment, when the ratio is less than 0.4, the height of the flange 21 is too low and the positioning effect is not strong; when the ratio is greater than 0.6, the weight of the safety valve 2 will increase and the energy density of the battery will decrease.
[0051] like Figure 1 As shown, in some embodiments, the height H3 of the exhaust gap 34 is between 0.5mm and 0.8mm; preferably, the height H3 is between 0.6mm and 0.7mm.
[0052] like Figure 4 As shown, in some embodiments, a recessed platform 22 is formed at the center of the safety valve 2, the base plate 5 is connected to the platform 22 of the safety valve 2, and a rubber ring 6 is provided between the base plate 5 and the safety valve 2.
[0053] like Figure 4 As shown, in some embodiments, the height H4 of the recessed platform 22 is between 0.45mm and 0.6mm; preferably, the height H4 is between 0.50mm and 0.55mm.
[0054] In this embodiment, when the height H4 of the sinking platform 22 is less than 0.45mm, the bottom plate 5 must compress the middle rubber ring 6 in order to connect with the sinking platform 22. When the compression of the rubber ring 6 is large, its rebound force will also increase, resulting in a continuous concentration of external force at the weld between the safety valve 2 and the bottom 5. After a long time, the welding reliability will decrease.
[0055] like Figure 2 As shown, in some embodiments, the number of convex hulls 33 is three, and they are evenly distributed.
[0056] like Figures 1 to 4 As shown, at least one embodiment provides an end plate for a cylindrical battery cap, comprising: a positioning ring 31; a welding piece 32; at least two protrusions 33, the two ends of which are respectively connected to the positioning ring 31 and the welding piece 32, and an exhaust gap 34 is provided between the positioning ring 31 and the welding piece 32; wherein the ratio of the width D1 of the positioning ring 31 to the diameter D2 of the end plate 3 is between 0.18 and 0.20; and / or the tilt angle α of the protrusions 33 is between 90 and 140°.
[0057] In some embodiments, the tilt angle α of the convex hull 33 is between 120 and 140°.
[0058] In some embodiments, the welding piece 32 is coaxial with the positioning ring 31 and is located above the positioning ring 31; the height H3 of the venting gap 34 is between 0.5mm and 0.8mm.
[0059] like Figure 3As shown, at least one embodiment provides a battery including: a cylindrical battery cap; a housing 4, the inner wall of which protrudes to form a second placement position 41 for placing the cylindrical battery cap; wherein the housing 4 is configured to cause the plastic ring 1 of the cylindrical battery cap to wrap inwardly around the safety valve 2 and the positioning ring 31 by deformation.
[0060] For the specific structure and implementation process of the cylindrical battery cap, please refer to the relevant discussion in the above embodiments, which will not be repeated here.
[0061] In summary, by modifying the end plate 3 of the cylindrical battery cap, the tilt angle α of the protrusion 33 used to connect the positioning ring 31 and the welding piece 32 is located between 120-140°. This improves the strength of the welding piece 32 while ensuring the welding area of the welding piece 32, and prevents the welding piece 32 from deforming under stress during the welding process.
[0062] In this document, when it is said that the first component is located on the second component, this can mean that the first component can be directly formed on the second component, or that the third component can be inserted between the first component and the second component.
[0063] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.
[0064] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.
[0065] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.
[0066] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.
[0067] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0068] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model 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 of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.
[0069] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.
[0070] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.
[0071] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. A cylindrical battery cap, characterized by, The cylinder battery cap cover comprises: a plastic ring (1) with a convex inner wall to form a first seating (11); a safety valve (2) arranged on the first seating (11) of the plastic ring (1); an end plate (3) arranged on the safety valve (2) and comprising a positioning ring (31) fitted with the safety valve (2), a welding sheet (32) and at least two convex blocks (33) connecting the positioning ring (31) and the welding sheet (32) and leaving an exhaust gap (34) between them; wherein the plastic ring (1) is adapted to wrap the safety valve (2) and the positioning ring (31) inwardly by the deformation of the shell (4); the ratio of the width D1 of the positioning ring (31) to the diameter D2 of the end plate (3) is between 0.15 and 0.26; the inclination angle α of the convex block (33) is between 90 and 140 degrees.
2. The cylinder battery cap cover according to claim 1, wherein the ratio of the width D1 of the positioning ring (31) to the diameter D2 of the end plate (3) is between 0.18 and 0.20; the inclination angle α of the convex block (33) is between 120 and 140 degrees.
3. The cylinder battery cap cover according to claim 1, wherein an upper edge of the safety valve (2) is provided with a turned edge (21) for guiding the positioning ring (31) to be seated; the ratio of the height H1 of the turned edge (21) to the thickness H2 of the positioning ring (31) is between 0.4 and 0.
6.
4. The cylinder battery cap cover according to claim 1, wherein the welding sheet (32) is coaxial with the positioning ring (31) and located above the positioning ring (31); the height H3 of the exhaust gap (34) is between 0.5 mm and 0.8 mm.
5. The cylinder battery cap cover according to claim 1, wherein a lower surface of the safety valve (2) is provided with a sunken platform (22); the height H4 of the sunken platform (22) is between 0.45 mm and 0.6 mm.
6. The cylindrical battery cap of claim 5, wherein, The cylinder battery cap cover further comprises: a bottom plate (5); the bottom plate (5) is connected with the sunken platform (22), and a rubber ring (6) is arranged between the bottom plate (5) and the sunken platform (22).
7. An end plate for a cylindrical battery cap, characterized by The cylinder battery cap cover comprises: a positioning ring (31); a welding sheet (32); at least two convex blocks (33) connecting the positioning ring (31) and the welding sheet (32) and leaving an exhaust gap (34) between them; wherein the ratio of the width D1 of the positioning ring (31) to the diameter D2 of the end plate (3) is between 0.15 and 0.26; and / or, the inclination angle α of the convex block (33) is between 90 and 140 degrees.
8. The end plate for the cylinder battery cap cover according to claim 7, wherein the inclination angle α of the convex block (33) is between 120 and 140 degrees.
9. The end plate for the cylinder battery cap cover according to claim 7, wherein the welding sheet (32) is coaxial with the positioning ring (31) and located above the positioning ring (31). The height H3 of the exhaust gap (34) is between 0.5 mm and 0.8 mm.
10. A battery, characterized by Comprising: The cylindrical battery cap of any one of claims 1-6; A shell (4) whose inner wall is convex to form a second seat (41) for placing the cylindrical battery cap; Wherein, the shell (4) is configured to drive the plastic ring (1) of the cylindrical battery cap to wrap the safety valve (2) and the positioning ring (31) inward by deformation.