Anti-torsion top cover and lithium battery
By setting a specific structure on the anti-torsion top cover sheet and lower plastic of the lithium battery, the fixation of the pole column and the lower plastic and top cover sheet is achieved, solving the problem of the pole column assembly twisting during the vibration of the lithium battery, simplifying the process, reducing costs, and enhancing the safety of the battery.
Patent Information
- Application Number
- CN202421328121.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-12
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-06-12
AI Technical Summary
Existing lithium batteries are prone to twisting the pole column assembly during vibration, causing liquid leakage in the battery and affecting safety. The existing anti-torsion structure has complex processes and many parts, and is costly.
An anti-torsion top cover is designed. By setting a first pole hole on the top cover sheet and a second pole hole on the lower plastic, the pole pillar is passed through the two holes and anchored on the top cover sheet. At the same time, the bottom end of the pole pillar is constructed into a square structure, and a square groove suitable for the square structure is provided on the lower plastic to achieve the fixation between the pole pillar and the bottom plastic and the top cover sheet to prevent twisting.
The anti-torsion effect is achieved through the structure of the top cover sheet and the lower plastic itself, which simplifies the anti-torsion process, reduces production costs, improves the anti-torsion performance of the battery, and enhances the safety of the battery.
Smart Images
Figure CN222785359U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium batteries, in particular to an anti-twist top cover and a lithium battery. Background Art
[0002] With the increasing prominence of environmental issues and the development of low-carbon economy, the new energy industry has become the mainstream of future economic development. Among them, batteries, as a carrier for storing electrical energy, can be used to store and transport the electrical energy produced by power plants, which is of great significance to the development of the new energy industry. Lithium-ion batteries are a highly efficient energy storage device and have become the focus of energy storage battery research and development.
[0003] At present, the square lithium batteries on the market are basically connected to the external structure through the positive electrode assembly and the negative electrode assembly. During the production process of the battery cell or after the single battery is grouped, the positive and negative electrode assemblies and the external connectors will generate a certain torque due to the vibration of the battery during use. At this time, the pole assembly needs to resist this part of the torque, otherwise the pole assembly will continue to rotate, which is easy to cause battery leakage, and then pose a huge threat to the safety of the single battery.
[0004] At present, most pole assemblies are anti-twisted by ceramic poles or by laser welding the pole assemblies to the top cover to achieve the anti-twisting effect. At the same time, the anti-twisting effect is also achieved by seamlessly matching the plastic and the pole. The above anti-twisting structural processes are relatively complex and have more parts, so the cost is relatively high. Utility Model Content
[0005] Based on this, it is necessary to provide an anti-twist top cover and a lithium battery to address the technical problem of the complex process of the anti-twist structure of the lithium battery cover in the related technology.
[0006] An anti-twist top cover, the anti-twist top cover comprising:
[0007] A top cover sheet is configured with a first pole hole, and the top cover sheet includes a first side surface and a second side surface that are oppositely disposed;
[0008] A lower plastic is sealed and fitted with the second side surface of the top cover sheet, and a second pole hole corresponding to the first pole hole is formed on the lower plastic;
[0009] A pole, comprising a top end and a bottom end arranged opposite to each other, wherein the top end passes through the first pole hole from the second pole hole on the lower plastic and is anchored to the first side surface of the top cover sheet;
[0010] The bottom end of the pole is constructed as a square structure; a first square groove matching the bottom end is provided on the side of the lower plastic away from the top cover sheet; and the bottom end is embedded in the first square groove.
[0011] In one embodiment, a second square groove is constructed at a position corresponding to the periphery of the first pole hole on the second side surface of the top cover sheet; a square protrusion is provided on the lower plastic at a position corresponding to the second square groove, and the square protrusion is embedded in the second square groove.
[0012] In one of the embodiments, a plurality of first limiting protrusions are disposed at the bottom of the second square groove, a first limiting groove corresponding to the first limiting protrusions is disposed on the square protrusion, and the first limiting protrusion is embedded in the first limiting groove.
[0013] In one embodiment, a plurality of the first limiting protrusions are arranged at intervals along the periphery of the first pole hole.
[0014] In one embodiment, the plurality of first limiting protrusions are constructed as annular protrusions arranged at intervals, and the structure of the first limiting groove is adapted to the first limiting protrusions.
[0015] In one of the embodiments, a plurality of second limiting grooves are arranged at intervals outside the second square groove on the second side of the top cover sheet, and a second limiting protrusion corresponding to the second limiting groove is arranged on the lower plastic, and the second limiting protrusion is embedded in the second limiting groove.
[0016] In one embodiment, a plurality of the second limiting grooves are arranged around the periphery of the second square groove.
[0017] In one embodiment, the anti-twist top cover further comprises:
[0018] A sealing member is pressed between the top cover sheet and the top end of the pole to seal the first pole hole.
[0019] In one embodiment, the seal comprises interconnected:
[0020] A flat portion, which is constructed as a flat ring structure, and is pressed between the top cover sheet and the top end of the pole;
[0021] The vertical portion is constructed as a cylindrical structure and is arranged in the first pole hole.
[0022] A lithium battery comprises the anti-twist top cover as described above.
[0023] Beneficial effects of the utility model:
[0024] The utility model provides an anti-twist top cover, the top cover sheet is used to seal with the shell of the lithium battery to form a closed space, install the battery cell and contain the electrolyte. The lower plastic is sealed and fitted with the second side of the top cover sheet to prevent the top cover from leaking. The pole is used to lead the voltage of the battery cell. By setting a first pole hole on the top cover sheet and a second pole hole on the lower plastic, the pole is passed through the first pole hole and the second pole hole and anchored to the first side of the top cover sheet to achieve the fixation of the pole to the lower plastic and the top cover sheet. By constructing the bottom end of the pole into a square structure, setting a first square groove that matches the bottom end on the side of the lower plastic away from the top cover sheet, and embedding the bottom end in the first square groove, the edges of the square groove and the square structure are mutually limited, thereby preventing the pole and the lower plastic from twisting during the vibration of the battery. The present application realizes the anti-twist effect through the structure of the top cover sheet and the lower plastic itself. Compared with the prior art, the structure is simple, the parts are few, the anti-twist process is simplified, and the production cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 A schematic diagram of the overall structure of an anti-twist top cover provided by an embodiment of the utility model;
[0026] Figure 2 An exploded schematic diagram of an anti-twist top cover provided in one embodiment of the utility model;
[0027] Figure 3 A cross-sectional schematic diagram of an anti-twist top cover provided by an embodiment of the utility model;
[0028] Figure 4 A schematic diagram of the three-dimensional structure of a top cover sheet in an anti-twist top cover provided by an embodiment of the utility model;
[0029] Figure 5 A plan view of a second side surface of a top cover in an anti-twist top cover provided in an embodiment of the utility model;
[0030] Figure 6 A schematic diagram of the three-dimensional structure of the lower plastic in the anti-twist top cover provided by an embodiment of the utility model;
[0031] Figure 7 A schematic plan view of the lower plastic in the anti-twist top cover provided by an embodiment of the utility model.
[0032] Reference numerals:
[0033] Top cover sheet 100; first pole hole 110; first side surface 120; second side surface 130; second square groove 131; first limiting protrusion 1311; second limiting groove 132; lower plastic 200; first square groove 210; square protrusion 220; first limiting groove 221; second limiting protrusion 230; second pole hole 240; pole 300; top end 310; bottom end 320; seal 400; flat portion 410; vertical portion 420. DETAILED DESCRIPTION
[0034] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.
[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0038] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.
[0040] See also Figures 1 to 7 An embodiment of the utility model provides an anti-twist top cover, which includes a top cover sheet 100, a lower plastic 200 and a pole 300. The top cover sheet 100 is configured with a first pole hole 110, and the top cover sheet 100 includes a first side surface 120 and a second side surface 130 that are oppositely arranged; the lower plastic 200 is sealed and fitted with the second side surface 130 of the top cover sheet 100, and a second pole hole 240 corresponding to the first pole hole 110 is configured on the lower plastic 200; the pole 300 includes a top end 310 and a bottom end 320 that are arranged opposite to each other. The top end 310 passes through the first pole hole 110 from the second pole hole 240 on the lower plastic 200 and is anchored to the first side 120 of the top cover sheet 100; wherein the bottom end 320 of the pole 300 is constructed as a square structure; a first square groove 210 that is adapted to the bottom end 320 is provided on the side of the lower plastic 200 that is away from the top cover sheet 100; and the bottom end 320 is embedded in the first square groove 210.
[0041] The technical solution provides an anti-twist top cover, and the top cover sheet 100 is used to seal with the shell of the lithium battery to form a closed space for installing the battery cell and containing the electrolyte. The lower plastic 200 is sealed with the second side 130 of the top cover sheet 100 to prevent leakage of the top cover. The pole 300 is used to lead out the voltage of the battery cell. By setting a first pole hole 110 on the top cover sheet 100 and a second pole hole 240 on the lower plastic 200, the pole 300 is passed through the first pole hole 110 and the second pole hole 240 and anchored to the first side 120 of the top cover sheet 100, so as to achieve the fixation of the pole 300 to the lower plastic 200 and the top cover sheet 100. By constructing the bottom end 320 of the pole 300 into a square structure, setting a first square groove 210 matching the bottom end 320 on the side of the lower plastic away from the top cover sheet 100, and embedding the bottom end 320 in the first square groove 210, the square groove and the edges of the square structure are mutually limited, thereby preventing the pole 300 and the lower plastic 200 from twisting during the vibration of the battery. The present application achieves anti-twisting through the structure of the top cover sheet 100 and the lower plastic 200 itself. Compared with the prior art, the structure is simple, the parts are few, the anti-twisting process is simplified, and the production cost is reduced.
[0042] Reference Figures 3 to 7 It is understood that in one embodiment, a second square groove 131 is constructed at a position corresponding to the periphery of the first pole hole 110 on the second side surface 130 of the top cover sheet 100; a square protrusion 220 is provided at a position corresponding to the second square groove 131 on the lower plastic 200, and the square protrusion 220 is embedded in the second square groove 131.
[0043] By providing a second square groove 131 on the second side surface 130 of the top cover sheet 100, and providing a square protrusion 220 on the lower plastic 200, the square protrusion 220 is embedded in the second square groove 131 to limit the torsion of the lower plastic 200 relative to the top cover sheet 100. Moreover, when the pole 300 is twisted, the inner side surface of the first square groove 210 on the lower plastic 200 resists the outer peripheral surface of the bottom end 320 of the pole 300, and the outer peripheral surface of the square protrusion 220 on the lower plastic 200 and the inner side surface of the second square groove 131 on the second side surface 130 of the top cover sheet 100 are mutually attached, and together offset the torque on the pole 300, thereby preventing the pole 300 from twisting, thereby improving the anti-twist performance of the anti-twist top cover.
[0044] It can be understood that, in this embodiment, the second square groove 131 can be a square groove or a rectangular groove; accordingly, the square protrusion 220 can be a square protrusion 220 or a rectangular protrusion 220, as long as the square protrusion 220 is compatible with the second square groove 131 and can offset the torsion of the pole 300.
[0045] Reference Figures 3 to 7 It is understood that in one embodiment, a plurality of first limiting protrusions 1311 are provided at the bottom of the second square groove 131 , a first limiting groove 221 corresponding to the first limiting protrusion 1311 is provided on the square protrusion 220 , and the first limiting protrusion 1311 is embedded in the first limiting groove 221 .
[0046] By arranging a plurality of first limiting protrusions 1311 at the bottom of the second square groove 131, and arranging a first limiting groove 221 on the square protrusion 220, and by mutually embedding the first limiting protrusions 1311 and the first limiting groove 221, when the pole 300 is twisted, the mutual limiting of the first limiting groove 221 and the first limiting protrusion 1311 further offsets the torque on the pole 300, and can further limit the twisting of the lower plastic 200 relative to the top cover sheet 100, thereby improving the anti-twisting performance of the pole 300 and the top cover sheet 100.
[0047] Reference Figures 3 to 7 It is understood that, further, the plurality of first limiting protrusions 1311 are arranged at intervals along the periphery of the first pole hole 110. The plurality of first limiting protrusions 1311 are arranged at intervals along the periphery of the first pole hole 110. On the one hand, the structure is simple and easy to process; on the other hand, it is also conducive to improving the torque generated on the offset pole 300. Furthermore, the plurality of first limiting protrusions 1311 are constructed as annular protrusions arranged at intervals, and the structure of the first limiting groove 221 is adapted to the first limiting protrusion 1311.
[0048] Reference Figures 4 to 7 It is understood that in this embodiment, the first limiting groove 221 is set as an annular groove, and the first limiting protrusion 1311 is set as an annular protrusion, which is convenient for processing. When the annular protrusion is embedded in the annular groove, the two limit each other, thereby limiting the rotation of the lower plastic 200 relative to the top cover sheet 100, and at the same time offsetting the rotation on the pole 300.
[0049] In this embodiment, the top cover sheet 100 is provided with a second square groove 131 at the first pole hole 110, and the bottom surface of the second square groove 131 is fitted with the top surface of the square protrusion 220 of the lower plastic 200; a certain number of annular bosses are provided on the bottom surface of the second square groove 131, and the number of the annular bosses is greater than or equal to 2; and an annular groove is correspondingly provided on the top surface of the square boss of the lower plastic 200. The outer side surface of the annular boss is fitted with the inner side surface of the annular groove, and the upper surface of the annular boss may or may not fit with the bottom wall of the annular groove. In this embodiment, the number of annular grooves and annular protrusions is four. It can be understood that the shapes of the first limiting protrusion 1311 and the first limiting groove 221 are not limited to annular, and can also be square, circular, elliptical, triangular, etc.
[0050] Reference Figures 4 to 7 It is understood that in one embodiment, a plurality of second limiting grooves 132 are arranged at intervals outside the second square groove 131 on the second side surface 130 of the top cover sheet 100, and a second limiting protrusion 230 corresponding to the second limiting groove 132 is arranged on the lower plastic 200, and the second limiting protrusion 230 is embedded in the second limiting groove 132. A plurality of second limiting grooves 132 are arranged around the periphery of the second square groove. By the above arrangement, the anti-twist function of the lower plastic 200 relative to the top cover sheet 100 can be further improved, and the torsion on the pole 300 can be offset, thereby improving the anti-twist performance of the anti-twist top cover. Specifically, the first limiting protrusion 1311 is set as a circular boss, and the second limiting groove 132 is set as a circular groove. Such an arrangement can simplify the structure while improving the torsion performance, thereby reducing the cost.
[0051] The top cover sheet 100 is provided with a certain number of circular grooves around the outer periphery of the second square groove 131, and the number of the circular grooves is greater than or equal to 2. The outer periphery of the square protrusion 220 of the lower plastic 200 is also provided with a certain number of circular bosses, and the number of the circular bosses is greater than or equal to 2, and the outer periphery of the circular bosses fits the inner side of the circular groove. In this embodiment, the number of circular grooves is 7, and the number of circular bosses is also 7. In other embodiments, the number of circular bosses and circular grooves can also be selected according to actual conditions. Of course, the cross-sectional shape of the second limiting protrusion 230 and the second limiting groove 132 can also be circular, triangular, elliptical, square, etc.
[0052] When torque is generated on the upper surface of the pole 300, the outer circumference of the square structure of the bottom end 320 of the pole 300 will contact the inner circumference of the first square groove 210 of the lower plastic 200, and the inner circumference of the first square groove 210 will block the rotation of the outer circumference of the bottom end 320 of the pole 300. At the same time, the outer side surface of the annular boss contacts the inner side surface of the annular groove, and the outer periphery of the circular boss contacts the inner side surface of the circular groove, so as to jointly offset the torque.
[0053] like Figures 1 to 3As shown, in one embodiment, the anti-twist top cover also includes a seal 400, which is pressed between the top cover sheet 100 and the top end 310 of the pole 300 to seal the first pole hole 110. Specifically, the sealing component is a rubber member, and the seal 400 is arranged between the top cover sheet 100 and the top end 310 of the pole 300 to improve the sealing performance of the anti-twist top cover, thereby preventing the anti-twist top cover from leaking. More specifically, the seal 400 includes a flat portion 410 and a vertical portion 420 connected to each other, the flat portion 410 is constructed as a flat annular structure, and the flat portion 410 is pressed between the top cover sheet 100 and the top end 310 of the pole 300; the vertical portion 420 is constructed as a cylindrical structure, and the vertical portion 420 is arranged in the first pole hole 110.
[0054] The pole 300 passes through the second pole hole 240 on the lower plastic 200 and the first pole hole 110 on the top cover sheet 100, and the vertical portion 420 of the seal 400 is sleeved on the pole 300, and the inner wall of the vertical portion 420 of the seal 400 is in contact with the outer peripheral surface of the pole 300, and the outer peripheral surface of the vertical portion 420 of the seal 400 is in contact with the inner wall of the first pole hole 110.
[0055] An embodiment of the utility model further provides a lithium battery, which includes the anti-twist top cover as described above. By constructing the bottom end 320 of the pole 300 into a square structure, a first square groove 210 matching the bottom end 320 is provided on the side of the lower plastic away from the top cover sheet 100, and the bottom end 320 is embedded in the first square groove 210, and the edges of the square groove and the square structure are mutually limited, thereby preventing the pole 300 and the lower plastic 200 from twisting during the vibration of the battery. The present application realizes the anti-twist effect through the structure of the top cover sheet 100 and the lower plastic 200 itself. Compared with the prior art, the structure is simple, the number of parts is small, the anti-twist process is simplified, and the production cost is reduced.
[0056] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0057] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. An anti-twist top cover, characterized in that: The anti-twist top cover comprises: A top cover sheet is configured with a first pole hole, and the top cover sheet includes a first side surface and a second side surface that are oppositely disposed; A lower plastic is sealed and fitted with the second side surface of the top cover sheet, and a second pole hole corresponding to the first pole hole is formed on the lower plastic; A pole, comprising a top end and a bottom end arranged opposite to each other, wherein the top end passes through the first pole hole from the second pole hole on the lower plastic and is anchored to the first side surface of the top cover sheet; The bottom end of the pole is constructed as a square structure; a first square groove matching the bottom end is provided on the side of the lower plastic away from the top cover sheet; and the bottom end is embedded in the first square groove.
2. The anti-twist top cover according to claim 1, characterized in that: A second square groove is constructed at a position corresponding to the periphery of the first pole hole on the second side surface of the top cover sheet; a square protrusion is arranged at a position corresponding to the second square groove on the lower plastic, and the square protrusion is embedded in the second square groove.
3. The anti-twist top cover according to claim 2, characterized in that: A plurality of first limiting protrusions are arranged at the bottom of the second square groove, a first limiting groove corresponding to the first limiting protrusions is arranged on the square protrusion, and the first limiting protrusions are embedded in the first limiting grooves.
4. The anti-twist top cover according to claim 3, characterized in that: A plurality of the first limiting protrusions are arranged at intervals along the periphery of the first pole hole.
5. The anti-twist top cover according to claim 4, characterized in that: The plurality of first limiting protrusions are constructed as annular protrusions arranged at intervals, and the structure of the first limiting groove is adapted to the first limiting protrusions.
6. The anti-twist top cover according to claim 2, characterized in that: A plurality of second limiting grooves arranged at intervals are arranged outside the second square groove on the second side surface of the top cover sheet, and a second limiting protrusion corresponding to the second limiting groove is arranged on the lower plastic, and the second limiting protrusion is embedded in the second limiting groove.
7. The anti-twist top cover according to claim 6, characterized in that: A plurality of the second limiting grooves are arranged around the periphery of the second square groove.
8. The anti-twist top cover according to any one of claims 1 to 7, characterized in that: The anti-twist top cover also includes: A sealing member is pressed between the top cover sheet and the top end of the pole to seal the first pole hole.
9. The anti-twist top cover according to claim 8, characterized in that: The seal comprises interconnected: A flat portion, which is constructed as a flat ring structure, and is pressed between the top cover sheet and the top end of the pole; The vertical portion is constructed as a cylindrical structure and is arranged in the first pole hole.
10. A lithium battery, characterized in that: The lithium battery comprises an anti-twist top cover as described in any one of claims 1-9.