Anti-explosion sheet for cylindrical battery top cover, cylindrical battery top cover and battery
By setting an annular recessed platform on the lower surface of the explosion-proof sheet, located outside the weakening groove, the problem of breakage during the welding of the explosion-proof sheet is solved, the safety and capacity of the battery are improved, and the weight and space occupied by the top cover are reduced, thereby improving the battery performance.
Patent Information
- Application Number
- CN202520104217.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-16
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-01-16
AI Technical Summary
In the prior art, the explosion-proof plate is prone to breakage when welded to the current collector, and the outer periphery of the annular recess 22 is prone to breakage when the annular recess 22 is welded to the current device.
By setting an annular recess on the lower surface of the explosion-proof sheet, located outside the weakening groove, the stress area during welding is reduced, preventing breakage of weak areas, simplifying the structure of the top cover assembly, eliminating the bottom plate and inner rubber ring, and reducing weight and space occupation.
This effectively prevents the weak areas of the explosion-proof sheet from breaking under stress, improves the safety performance and capacity of the battery, reduces the weight and space occupied by the top cover, and improves the energy density and welding reliability of the battery.
Smart Images
Figure CN223757633U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to cylindrical battery technical field, concretely relates to the end cover of battery, especially relates to an explosion -proof sheet for cylindrical battery top cover, cylindrical battery top cover and battery. BACKGROUND
[0002] The top cover of the battery at least includes the explosion -proof sheet, and when the pressure in the battery exceeds the threshold value, the pressure relief is realized through the crushing of the explosion -proof sheet.
[0003] As Figure 1 As shown in the related art, in order to guide the opening of the explosion -proof sheet, weakening groove is arranged on the upper surface of the explosion -proof sheet, and in order to facilitate the welding of the explosion -proof sheet and the current collecting disc, the lower surface of the explosion -proof sheet is provided with a sink table, but in the above scheme, the position of the sink table is in the central region of the weakening groove, and the sink table is subjected to a certain degree of downward pressure when being welded with the current collecting disc, so that the explosion -proof sheet is easily broken under stress.
[0004] Therefore, how to solve the technical problem that the sink table is easily broken under stress when being welded with the current collecting disc is an urgent problem for those skilled in the art.
[0005] It should be noted that the above information disclosed in the background technology part of the present application is only used to understand the background technology of the present application, and therefore, the above description is not considered as the information of the prior art. CONTENT OF THE UTILITY MODEL
[0006] The present disclosure provides at least an explosion -proof sheet for cylindrical battery top cover, cylindrical battery top cover and battery.
[0007] In a first aspect, the present disclosure provides a cylindrical battery top cover, comprising: an outer rubber ring, the inner wall of which is provided with a first supporting position; an explosion -proof sheet arranged on the first supporting position; an upper cover plate arranged on the explosion -proof sheet; the outer rubber ring is adapted to wrap the explosion -proof sheet and the upper cover plate inwardly through the deformation of the shell; wherein the upper surface of the explosion -proof sheet is provided with weakening groove, the lower surface of the explosion -proof sheet is provided with annular sink table, and the annular sink table is located at the periphery of the weakening groove.
[0008] In an optional embodiment, the height H1 of the annular sink table is between 0.1mm-0.2mm.
[0009] In an optional embodiment, the width D of the annular sink table is between 1mm-3mm.
[0010] In an optional embodiment, the annular sink table and the lower surface of the explosion -proof sheet are connected through a circular arc angle alpha.
[0011] In a second aspect, the present disclosure also provides a cylindrical battery top cover, which comprises an outer rubber ring, an explosion-proof sheet and an upper cover plate; wherein an inner wall of the outer rubber ring is provided with a first bearing position, the explosion-proof sheet is arranged on the first bearing position, and the upper cover plate is arranged on the explosion-proof sheet; the outer rubber ring is adapted to wrap the explosion-proof sheet and the upper cover plate inward by deformation of the shell; an upper surface of the explosion-proof sheet is provided with a weakening groove, and a lower surface of the explosion-proof sheet is provided with an annular sunken table, and the annular sunken table is located at the periphery of the weakening groove.
[0012] In an optional embodiment, the height H1 of the annular sunken table is between 0.1 mm and 0.2 mm.
[0013] In an optional embodiment, the width D of the annular sunken table is between 1 mm and 3 mm.
[0014] In a third aspect, the present disclosure also provides an explosion-proof sheet for a cylindrical battery top cover, which comprises an explosion-proof sheet body, a weakening groove arranged on the outer side of the explosion-proof sheet body, and an annular sunken table arranged on the inner side of the explosion-proof sheet body; wherein the annular sunken table is located at the periphery of the weakening groove; the height H1 of the annular sunken table is between 0.1 mm and 0.2 mm; and the width D of the annular sunken table is between 1 mm and 3 mm.
[0015] In a fourth aspect, the present disclosure also provides a battery, which comprises a cylindrical battery top cover and a shell, and an inner wall of the shell is provided with a second bearing position for placing the cylindrical battery top cover; wherein the shell is configured to drive the outer rubber ring of the cylindrical battery top cover to wrap the explosion-proof sheet and the upper cover plate inward by deformation.
[0016] In an optional embodiment, a side wall of the shell is provided with a U-shaped groove; a current collector accommodating area is left between a lower side wall of the U-shaped groove and the annular sunken table, and the height H2 of the current collector accommodating area is between 1.0 mm and 1.6 mm.
[0017] The cylindrical battery top cover explosion-proof sheet, the cylindrical battery top cover and the battery of the present application have the following beneficial effects: the annular sunken table is arranged at the periphery of the weakening groove, so that when the annular sunken table is welded with the current collector, only a small part of force is borne by the area where the weakening groove is located, and the weak area of the explosion-proof sheet is prevented from being broken by force.
[0018] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application will be realized and achieved by the structures particularly pointed out in the description and the appended drawings.
[0019] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application will be described in detail below with reference to the preferred embodiments and 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 schematic diagram of the structure of a conventional explosion-proof sheet provided in an embodiment of the present disclosure;
[0022] Figure 2 This is a cross-sectional view of a cylindrical battery top cover provided in an embodiment of the present disclosure;
[0023] Figure 3 This is a schematic diagram of the structure of a cylindrical battery top cover after installation, provided by an embodiment of this disclosure;
[0024] Figure 4 This is a cross-sectional structural diagram of a battery provided in an embodiment of this disclosure.
[0025] In the picture:
[0026] Outer rubber ring 1, first support position 11;
[0027] Explosion-proof plate 2, weakening groove 21, annular recessed platform 22, circular recessed platform 23;
[0028] Top cover plate 3;
[0029] 4. Outer shell; 41. Second support position; 42. U-shaped groove; 43. Collection plate receiving area;
[0030] Collector disk 5;
[0031] The height H1 of the annular recess, the width D of the annular recess, and the height H2 of the manifold receiving area. Detailed Implementation
[0032] 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.
[0033] It should be noted that like reference numerals and characters refer to like elements throughout the several views, and that, additionally, the thicknesses of the components can be exaggerated or reduced in the drawings for effective presentation of the technical content.
[0034] Some embodiments of the present application will be described in detail with reference to the drawings. The following embodiments and features of the embodiments can be combined with each other in the case of no conflict.
[0035] The inventor found that, as shown in the prior art, Figure 1 The prior art venting sheet 2 has a weakening groove 21 formed on the outer surface of the venting sheet 2 to guide the pressure relief direction, and a circular counterbore 23 is arranged on the inner surface of the venting sheet 2 to facilitate the welding of the venting sheet 2 and the current collecting disc. However, the circular counterbore 23 is located in the central region of the weakening groove 21, so that when the circular counterbore 23 is welded with the current collecting disc 5, the venting sheet 2 is easily broken under a certain downward pressure of the tooling fixture.
[0036] Therefore, in order to solve the above problems, as shown in the at least one embodiment, Figure 2 The cylindrical battery top cover comprises an outer rubber ring 1, a venting sheet 2, and an upper cover plate 3.
[0037] As shown in the at least one embodiment, Figure 2 In some embodiments, the inner wall of the outer rubber ring 1 is protruded to form a first supporting position 11, and the first supporting position 11 is arranged along the circumference of the outer rubber ring 1 to support the venting sheet 2.
[0038] As shown in the at least one embodiment, Figure 2 In some embodiments, the venting sheet 2 is placed on the first supporting position 11, and the venting sheet 2 is broken to relieve pressure when the pressure inside the battery exceeds a threshold value.
[0039] As shown in the at least one embodiment, Figure 2 In some embodiments, the upper cover plate 3 is arranged on the venting sheet 2, the lower surface of the upper cover plate 3 is attached to the venting sheet 2, and the upper surface of the upper cover plate 3 is used for welding with the busbar.
[0040] As shown in the at least one embodiment, Figure 3 In the present embodiment, after the venting sheet 2 and the upper cover plate 3 are arranged on the outer rubber ring 1, the outer rubber ring 1 is placed on the second supporting position 41 of the outer shell 4, and then the outer shell 4 is deformed to drive the outer rubber ring 1 to wrap the venting sheet 2 and the upper cover plate 3, thereby fixing the venting sheet 2 and the upper cover plate 3.
[0041] As shown in the at least one embodiment, Figure 2As shown, in some embodiments, a weakening groove 21 is provided on the upper surface of the explosion-proof sheet 2, and an annular recess 22 is provided on the lower surface of the explosion-proof sheet 2, with the annular recess 22 located around the weakening groove 21.
[0042] In this embodiment, the weak area of the explosion-proof sheet 2 is in the area framed by the weakening groove 21. By setting the annular recess 22 on the periphery of the weakening groove 21, when the annular recess 22 is welded to the collector plate 5, the area where the weakening groove 21 is located will only bear a small part of the force, thus avoiding the weak area of the explosion-proof sheet 2 from breaking under stress.
[0043] like Figure 2 As shown, in some embodiments, the height H1 of the annular platform 22 is between 0.1 mm and 0.2 mm.
[0044] In this embodiment, when the height of the annular recess 22 is less than 0.1 mm, it has little effect on strengthening the structure of the explosion-proof plate 2, and at the same time, its heat conduction distance is too short, which can easily affect the valve opening performance of the explosion-proof plate 2; when the height of the annular recess 22 is greater than 0.2 mm, it will occupy the internal space of the battery, resulting in a decrease in battery capacity.
[0045] like Figure 2 As shown, in some embodiments, the width D of the annular recess 22 is between 1 mm and 3 mm.
[0046] In this embodiment, when the width D of the annular recess 22 is less than 1mm, the welding area will be reduced, resulting in a reduction in the weldable area with the current collector 5, which will cause the temperature at the welding point to rise and affect the battery performance. When the width D of the annular recess 22 is greater than 3mm, the annular recess 22 will occupy the opening area of the explosion-proof plate 2, resulting in the explosion-proof plate 2 opening area being too small when the battery thermally runs away, and a large amount of gas generated inside the battery cannot be discharged in time, causing a safety problem for the battery.
[0047] In some embodiments, the annular recess 22 and the lower surface of the explosion-proof sheet 2 are transitioned by a rounded corner α, which not only facilitates manufacturing, reduces production difficulty, and improves yield, but also prevents stress concentration, prevents cracking, and can even effectively reduce burr generation, thereby improving the safety performance of the battery.
[0048] The inventor discovered through research that, for example Figure 1As shown, the existing cylindrical secondary battery has many components of the top cover, the explosion-proof sheet 2 in the top cover needs to be welded with the bottom plate 6 first, and then the bottom plate 6 is welded with the current collector plate 5, and the inner rubber ring 7 needs to be arranged between the explosion-proof sheet 2 and the bottom plate 6. The space occupied by the whole top cover is large, and on the basis of the total height of the top cover, the space inside the battery is compressed, which leads to the incapability of improving the capacity of the battery; at the same time, due to the many components of the top cover, the overall weight of the top cover is relatively heavy, which leads to the incapability of significantly improving the energy density of the battery.
[0049] Therefore, in order to solve the above problems, as shown in Figure 2 At least one embodiment provides a cylindrical battery top cover, which is composed of an outer rubber ring 1, an explosion-proof sheet 2 and an upper cover plate 3. By the above only three parts, the weight of the top cover is reduced and the occupation of the space inside the battery is reduced.
[0050] Specifically, the inner wall of the outer rubber ring 1 is provided with a first supporting position 11, the explosion-proof sheet 2 is arranged on the first supporting position 11, and the upper cover plate 3 is arranged on the explosion-proof sheet 2.
[0051] In the embodiment, the upper cover plate 3 is welded with the busbar, the upper cover plate 3 is attached with the explosion-proof sheet 2, and the explosion-proof sheet 2 is directly welded with the current collector plate 5. Not only the bottom plate 6 and the inner rubber ring 7 are reduced, but also the weight of the cylindrical battery top cover is reduced. In addition, the welding process of the bottom plate 6 and the explosion-proof sheet 2 is omitted, the welding reliability is improved, and the overall height of the cylindrical battery top cover is reduced, the space occupied by the battery is reduced, that is, the space inside the battery is increased, and the capacity of the battery is improved.
[0052] For the specific structure and implementation process of the outer rubber ring 1, the explosion-proof sheet 2 and the upper cover plate 3, please refer to the relevant discussion in the above embodiment, which will not be repeated here.
[0053] As shown in Figure 2 At least one embodiment provides an explosion-proof sheet for a cylindrical battery top cover, which comprises: an explosion-proof sheet body 23; a weakening groove 21 arranged on the outer side of the explosion-proof sheet body 23; and a ring-shaped sunken table 22 arranged on the inner side of the explosion-proof sheet body 23; wherein the ring-shaped sunken table 22 is located at the periphery of the weakening groove 21; the height H1 of the ring-shaped sunken table 22 is between 0.1mm and 0.2mm; and the width D of the ring-shaped sunken table 22 is between 1mm and 3mm.
[0054] As shown in Figure 4 At least one embodiment provides a battery, which comprises: a cylindrical battery top cover; and an outer shell 4, the inner wall of which is provided with a second supporting position 41 for placing the cylindrical battery top cover; wherein the outer shell 4 is configured to drive the outer rubber ring 1 of the cylindrical battery top cover to wrap the explosion-proof sheet 2 and the upper cover plate 3 inward by deformation.
[0055] In one application scenario, the cylindrical battery top cover comprises an outer rubber ring 1, an explosion-proof sheet 2 and an upper cover plate 3.
[0056] For the specific structure and implementation process of the cylindrical battery top cover, please refer to the relevant discussion in the above embodiments, which will not be repeated here.
[0057] In another application scenario, the cylindrical battery top cover is composed of an outer rubber ring 1, an explosion-proof sheet 2 and an upper cover plate 3.
[0058] For the specific structure and implementation process of the cylindrical battery top cover, please refer to the relevant discussion in the above embodiments, which will not be repeated here.
[0059] As shown in the drawings, Figure 4 In some embodiments, the side wall of the shell 4 is provided with a U-shaped groove 42.
[0060] In this embodiment, the U-shaped groove 42 can well receive the top cover, prevent the top cover from deforming during sealing with the shell 4, and also prevent the outer rubber ring 1 from being compressed unevenly.
[0061] As shown in the drawings, Figure 4 In some embodiments, the lower side wall 421 of the U-shaped groove 42 and the annular sink 22 are left with a current collector containing area 43, and the height H2 of the current collector containing area 43 is between 1.0mm-1.6mm.
[0062] In this embodiment, since the bottom plate and the inner rubber ring are cancelled, the space occupied by the cylindrical battery top cover is only above the U-shaped groove 42, and the area where the U-shaped groove 42 is located can be left empty to place the current collector. At this time, the battery cell inside the battery can be made higher until it is close to the lower side wall 421 of the U-shaped groove 42, thereby increasing the capacity of the battery.
[0063] In summary, the cylindrical battery top cover, the cylindrical battery top cover and the battery of the present application set the annular sink 22 on the periphery of the weakening groove 21, so that when the annular sink 22 is welded with the current collector 5, the area where the weakening groove 21 is located will only bear a small part of the force, avoiding the breaking of the weak area of the explosion-proof sheet 2.
[0064] In this document, when it is mentioned that a first component is located on a second component, it can mean that the first component can be directly formed on the second component, or a third component can be interposed between the first component and the second component.
[0065] In this document, when an element or layer is referred to as being "on", "engaged to", "connected to", "attached to" or "coupled to" another element or layer, it can be directly on, engaged, connected, attached or coupled to the other element or layer, or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on", "directly engaged to", "directly connected to", "directly attached to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (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 associated listed items.
[0066] In this document, example embodiments of the disclosure will be described in greater detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of," when preceding a list of two or more items, modify the entire list of items and do not modify the individual items of the list.
[0067] The terminology used herein is for the purpose of describing particular example configurations only and is not intended to be limiting. As used herein, the singular articles "a," "an," and "the" can be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated 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 groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order
[0068] As used herein, the phrases "in an embodiment," "according to an embodiment," "in some embodiments," and the like, generally mean the particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of the present disclosure. Thus, appearances of such phrases in various places throughout this specification do not necessarily all refer to the same embodiment. As used herein, the term "example" or "exemplary" means "serving 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 advantageous over other implementations, aspects or designs. Rather, the term "example" or "exemplary" is intended to present concepts in a concrete manner.
[0069] In the description of the embodiments of the utility model, unless otherwise clear and definite, the terms "mount", "connect", "connection" should be understood in broad sense, for example, it can be fixed connection, also can be detachable connection, or integrally connected, it can be mechanical connection, also can be electrical connection, it can be direct connection, also can be indirect connection through intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.
[0070] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model. In addition, terms such as "first", "second" and other numerical terms are used in this document, unless otherwise indicated in this document. Therefore, the above-discussed first element, component, region, layer or section can be referred to as the second element, component, region, layer or section without departing from the teachings of the example embodiments.
[0071] Spatially relative terms, such as "inner", "outer", "below", "below", "lower", "above", "upper", and the like, can be used herein to facilitate description of the relationship of one element or feature to another element or feature as illustrated in the figures. In addition to the orientation depicted in the figures, the spatially relative terms can be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is turned over, the element described as "below" or "under" the other element or feature will be oriented "above" the other element or feature. Therefore, the example term "below" can cover the above and below orientations. The device can be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.
[0072] In the above discussion, unless otherwise stated, the terms "about", "approximately", "substantially" and the like mean a + / -10% variation of the value when used to describe numerical values.
[0073] With the above ideal embodiments according to the utility model as inspiration, through the above description, relevant staff can definitely make various changes and modifications without deviating from the technical idea of the utility model. The technical scope of the utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of claims.
Claims
1. A cylindrical battery top cover, characterized by, The cylinder battery top cover comprises an outer rubber ring (1), an explosion-proof sheet (2) and an upper cover plate (3). The outer rubber ring (1) is adapted to wrap the explosion-proof sheet (2) and the upper cover plate (3) inward by the deformation of the outer shell (4).
2. The cylinder battery top cover according to claim 1, wherein the height H1 of the annular sunken platform (22) is between 0.1mm and 0.2mm.
3. The cylinder battery top cover according to claim 1, wherein the width D of the annular sunken platform (22) is between 1mm and 3mm.
4. The cylinder battery top cover according to claim 1, wherein the annular sunken platform (22) and the lower surface of the explosion-proof sheet (2) are connected through a circular arc angle α. The cylinder battery top cover comprises an outer rubber ring (1), an explosion-proof sheet (2) and an upper cover plate (3). The outer rubber ring (1) is adapted to wrap the explosion-proof sheet (2) and the upper cover plate (3) inward by the deformation of the outer shell (4). The explosion-proof sheet (2) has a weakening groove (21) on the upper surface and an annular sunken platform (22) on the lower surface.
6. The cylinder battery top cover according to claim 5, wherein the height H1 of the annular sunken platform (22) is between 0.1mm and 0.2mm.
7. The cylinder battery top cover according to claim 6, wherein the width D of the annular sunken platform (22) is between 1mm and 3mm. The cylinder battery top cover comprises an outer rubber ring (1), an explosion-proof sheet (2) and an upper cover plate (3). The outer rubber ring (1) is adapted to wrap the explosion-proof sheet (2) and the upper cover plate (3) inward by the deformation of the outer shell (4).
5. A cylindrical battery top cover, characterized by, The explosion-proof sheet (2) has a weakening groove (21) on the upper surface and an annular sunken platform (22) on the lower surface.
6. The cylinder battery top cover according to claim 5, wherein the height H1 of the annular sunken platform (22) is between 0.1mm and 0.2mm.
7. The cylinder battery top cover according to claim 6, wherein the width D of the annular sunken platform (22) is between 1mm and 3mm. The cylinder battery top cover comprises an outer rubber ring (1), an explosion-proof sheet (2) and an upper cover plate (3). The outer rubber ring (1) is adapted to wrap the explosion-proof sheet (2) and the upper cover plate (3) inward by the deformation of the outer shell (4).
10. The battery according to claim 9, wherein the side wall of the outer shell (4) is provided with a U-shaped groove (42). 8. An explosion-proof sheet for a cylindrical battery top cover, characterized by 9. A battery, characterized by A collector accommodating area (43) is left between the lower side wall (421) of the U-shaped groove (42) and the annular sink (22), and the height H2 of the collector accommodating area (43) is between 1.0 mm and 1.6 mm.