Top cover structure and battery

Abstract

The utility model belongs to the technical field of new energy batteries, and discloses a top cover structure and a battery. The top cover structure comprises a cover plate, a pole and a sealing ring, a first mounting hole is formed in the cover plate in a penetrating mode, the pole is arranged in the first mounting hole in a penetrating mode, a first rotation stopping part is arranged on the peripheral face of the pole, the sealing ring is clamped between the pole and the cover plate in a sealed mode, and a second rotation stopping part is arranged at the position, corresponding to the first rotation stopping part, of the sealing ring. And the first rotation stopping part and the second rotation stopping part are in limiting fit to realize circumferential limiting of the pole. Through the riveting effect of the pole, the sealing ring can be clamped between the pole and the cover plate, so that the mounting stability of the sealing ring is improved. And through the limiting matching effect of the first rotation stopping part arranged on the outer periphery of the post body and the second rotation stopping part arranged on the inner periphery of the sealing ring, the sealing ring can circumferentially limit the post, so that the post is effectively prevented from rotating, and the top cover structure manufactured in the mode achieves the post torsion required by customers.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, in particular to a top cover structure and a battery. Background Art

[0002] Lithium batteries, due to their high specific energy, high operating voltage, long cycle life, and environmentally friendly advantages, have been widely used in new energy vehicles, energy storage, and other fields. With market development, power lithium batteries are gradually moving towards higher energy density and improved safety performance. The top cover structure of a lithium battery typically consists of a terminal, an upper plastic part, a top cover plate, and a lower plastic part. Before use, the lithium battery needs to be encapsulated with the top cover plate, and the terminal is installed on the top cover plate to connect the lithium battery to the outside world.

[0003] Most existing lithium battery terminals are riveted. After riveting, the lower plastic part is pressed upward to provide resistance to the terminal's rotation. However, this method is difficult to achieve the terminal torque required by customers. Therefore, there is an urgent need for a top cover structure and battery to solve the technical problems existing in the existing technology. Utility Model Content

[0004] One purpose of the utility model is to provide a top cover structure, which can strengthen the circumferential limiting effect on the pole and prevent the pole from circumferential rotation, so that the pole torque meets the requirement.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] The top cover structure includes a cover plate, a pole and a sealing ring. A first mounting hole is provided on the cover plate, the pole is passed through the first mounting hole, and a first anti-rotation portion is provided at the outer circumference of the pole. The sealing ring is clamped between the pole and the cover plate, and a second anti-rotation portion is provided at the position of the sealing ring corresponding to the first anti-rotation portion. The first anti-rotation portion and the second anti-rotation portion are limited and cooperated to achieve circumferential limitation of the pole.

[0007] Preferably, the first anti-rotation portion is defined as an inner recess recessed inward from the outer circumference of the pole, and the second anti-rotation portion is defined as an inner protrusion protruding from the inner circumference of the sealing ring and engaging with the inner recess in a limiting manner.

[0008] Preferably, the first anti-rotation portion is defined as an outer protrusion protruding outward from the outer circumferential surface of the pole, and the second anti-rotation portion is defined as an outer recess recessed inward from the inner circumferential surface of the sealing ring and engaging with the inner protrusion in a limiting manner.

[0009] Preferably, the inner concave surface of the inner recess or the outer convex surface of the outer protrusion is defined as a first plane, and the inner convex surface of the inner protrusion or the outer concave surface of the outer recess is defined as a second plane, and the second plane is fitted and connected to the first plane.

[0010] Preferably, the straight-line distance between the first plane and the axis of the pole is defined as a, the radius of the pole is defined as b, and a and b satisfy the following relationship: ba≥0.5 mm.

[0011] Preferably, the top cover structure also includes a lower plastic part, a second mounting hole is provided through the lower plastic part, the pole is passed through the second mounting hole, and a third stop portion is provided at the position of the second mounting hole corresponding to the position of the first stop portion, and the first stop portion and the third stop portion are limited and cooperated to achieve circumferential limitation of the pole.

[0012] Preferably, the lower plastic part includes a first lower plastic split and a second lower plastic split, the first lower plastic split is connected to the second lower plastic split, the first lower plastic split is penetrated by the second mounting hole, the second lower plastic split is penetrated by the third mounting hole, the opening cross-sectional area of ​​the third mounting hole is larger than the opening cross-sectional area of ​​the second mounting hole, the third mounting hole is coaxially arranged and connected to the second mounting hole, and the pole is passed through the third mounting hole and the second mounting hole.

[0013] Preferably, the first lower plastic body is detachably connected to the second lower plastic body;

[0014] Alternatively, the first lower plastic body and the second lower plastic body are integrally formed.

[0015] Preferably, the lower plastic part is clamped between the cover plate and the pole, and a fourth stop part is provided at the position of the first mounting hole corresponding to the third stop part, and the fourth stop part cooperates with the third stop part to achieve circumferential limitation of the lower plastic part.

[0016] Another object of the present invention is to provide a battery, which, by using the above-mentioned top cover structure in the battery, can ensure the installation stability of the battery pole, improve the overall performance and safety of the battery, and extend the service life of the battery.

[0017] To achieve this purpose, the present invention adopts the following technical solutions:

[0018] A battery comprises a battery casing, a single cell and the above-mentioned top cover structure, wherein the battery casing has a receiving cavity, the single cell is received in the receiving cavity, and the top cover structure sealing cover is arranged on the battery casing.

[0019] Beneficial effects of the utility model:

[0020] This embodiment provides a top cover structure comprising a pole cover plate, a pole post, and a sealing ring. The sealing ring is tightly clamped between the pole post and the cover plate by riveting the pole post, improving the sealing ring's installation stability and significantly reducing the possibility of pole post rotation. Furthermore, the sealing ring is able to circumferentially limit the pole post through the cooperation of a first rotation-stopping portion provided on the outer periphery of the post and a second rotation-stopping portion provided on the inner periphery of the sealing ring, effectively preventing the pole post from rotating. This allows the top cover structure manufactured in this manner to achieve the pole post torque requirements required by customers.

[0021] This embodiment also provides a battery comprising the aforementioned battery housing, a single cell, and a top cover structure. The single cell is housed within the housing cavity of the battery housing, and a cover plate sealing cover of the top cover structure is provided on the battery housing. The provision of the aforementioned top cover structure within the battery ensures the stability of the battery terminal installation, thereby improving the overall performance and safety of the battery and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a battery provided by an embodiment of the present utility model;

[0023] Figure 2 This is a top view of the top cover structure provided by an embodiment of the present utility model;

[0024] Figure 3 It is along Figure 2 Cross-sectional view at AA in the middle;

[0025] Figure 4 This is an exploded view of a battery provided by an embodiment of the present utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the pole provided by an embodiment of the present utility model;

[0027] Figure 6 This is a bottom view of the pole provided by the embodiment of the present utility model when it is not riveted to the cover plate;

[0028] Figure 7 This is a schematic structural diagram of the sealing ring provided in an embodiment of the present utility model;

[0029] Figure 8 This is an exploded view of the lower plastic part provided by an embodiment of the present utility model;

[0030] Figure 9 It is a partial structural schematic diagram of the cover plate provided by an embodiment of the present utility model.

[0031] In the picture:

[0032] 100, top cover structure; 110, cover plate; 111, first mounting hole; 112, fourth anti-rotation portion; 1121, fourth plane; 120, pole; 121, base plate; 122, column; 1221, first anti-rotation portion; 12211, first plane; 130, upper plastic component; 140, sealing ring; 141, second anti-rotation portion; 1411, second plane; 150, lower plastic component; 151, first lower plastic body; 1511, second mounting hole; 1512, third anti-rotation portion; 15121, third plane; 152, second lower plastic body; 1521, third mounting hole;

[0033] 200. Battery casing. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0035] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0036] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, terms such as "upper," "lower," "right," and "left" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0038] Combine Figures 1 to 3 As shown, this embodiment provides a top cover structure 100 , including a cover plate 110 , a pole 120 disposed on the cover plate 110 , an upper plastic part 130 insulated and sealed between the cover plate 110 and the pole 120 , a sealing ring 140 and a lower plastic part 150 . The top cover structure 100 is applied to the battery, wherein the cover plate 110 is sealed and fastened to the opening of the battery shell 200 of the battery, and is used to seal and preserve the single battery cell in the battery shell 200 to avoid interference from the external environment. The pole 120 is used to electrically connect the single battery cell with external electrical equipment to ensure effective transmission of current. The upper plastic part 130 is used to protect the electrical isolation between the pole 120 and the cover plate 110 to avoid short circuits and other electrical faults. The sealing ring 140 is used to fill the gap between the cover plate 110 and other components, thereby providing additional sealing effect to ensure the long-term reliability and stability of the top cover structure 100. The lower plastic part 150 is mainly used to separate the cover plate 110 and the single battery cell, thereby playing the role of insulating the single battery cell and fixing the single battery cell.

[0039] Optionally, in this embodiment, the battery is a cylindrical battery, that is, the battery housing 200 is circular, and in the top cover structure 100, the shape of the cover plate 110 is adaptively set to a circular shape. In other embodiments, when the battery is a prismatic battery, that is, when the battery housing 200 is square, the shape of the cover plate 110 is adaptively set to a square shape. Therefore, the shape of the cover plate 110 provided in this application is set according to the shape of the battery housing 200, and this application is not limited to this.

[0040] Furthermore, a first mounting hole 111 of a preset radial size is provided at the center of the cover plate 110, and a pole 120 is provided in the first mounting hole 111. The pole 120 is usually a positive pole. Figure 5 and Figure 6As shown, the above-mentioned pole 120 specifically includes a base plate 121 disposed on the lower side of the cover plate 110 and a column 122 protruding from the base plate 121. The column 122 is upwardly extended through the first mounting hole 111 and exposed on the upper side of the cover plate 110. The horizontal projection area of ​​the base plate 121 is larger than the horizontal projection area of ​​the first mounting hole 111, so that the base plate 121 can overlap the lower side of the cover plate 110 and completely cover the bottom of the first mounting hole 111. It will be understood that the lower plastic component 150 is sandwiched between the base plate 121 and the cover plate 110 to achieve electrical insulation between the pole 120 and the cover plate 110.

[0041] refer to Figure 6 As shown, a first rotation-stopping portion 1221 is provided on the outer circumference of the cylinder 122. The first rotation-stopping portion 1221 is defined as an inner recess recessed inward from the outer circumference of the cylinder 122. The inner recess may be a groove or notch recessed inward along the radial direction of the cylinder 122. In this embodiment, the outer circumference of the cylinder 122 is composed of a first plane 12211 and an arcuate surface, so that the cylinder 122 is "D"-shaped when projected horizontally. During manufacturing, the first plane 12211 can be formed by cutting, milling, or other methods. The space missing from the cylinder 122 after processing forms the inner recess, and the first plane 12211 forms the inner concave surface of the inner recess.

[0042] It should be noted that, in other embodiments, the first anti-rotation portion 1221 can also be defined as an external protrusion protruding outward from the outer peripheral surface of the pole 120. The external protrusion can be an external protrusion of various shapes protruding outward in the radial direction of the column 122, and the outer convex surface of the external protrusion (the side away from the column 122 in the radial direction) can be defined as the first plane 12211.

[0043] refer to Figure 7 As shown, the sealing ring 140 has an annular structure. A second rotation stop 141 is provided on the sealing ring 140 at a position corresponding to the first rotation stop 1221. The second rotation stop 141 is defined as an inner protrusion protruding from the inner circumferential surface of the sealing ring 140. The inner protrusion can be an outer protrusion extending radially from the outer edge of the sealing ring 140 toward the center of the sealing ring 140. In this embodiment, the inner circumferential surface of the sealing ring 140 is composed of a second flat surface 1411 and an arc-shaped surface, resulting in a "D" shape in horizontal projection. During manufacturing, the second flat surface 1411 can be formed by injection molding or other methods. After the sealing ring 140 is formed, the portion of the sealing ring 140 corresponding to the first rotation stop 1221 is transformed from an arc segment to a straight segment, forming the aforementioned inner protrusion. The surface of the straight segment facing the first rotation stop 1221 forms the inner convex surface of the inner protrusion, which is the aforementioned second flat surface 1411.

[0044] It should be noted that, in other embodiments, the second stop portion 141 can also be defined as an external recess that is recessed inward from the inner circumference of the sealing ring 140. The external recess can be a groove or notch that is recessed inward along the radial direction of the sealing ring 140. The outer concave surface of the external recess (the side facing the first stop portion 1221 along the radial direction) can be defined as a second plane 1411.

[0045] The riveting action of the pole 120 allows the sealing ring 140 to be tightly clamped between the pole 120 and the cover plate 110, thereby improving the installation stability of the sealing ring 140 and significantly reducing the possibility of rotation of the pole 120. Furthermore, through the limiting cooperation of the first rotation-stopping portion 1221 provided on the outer periphery of the column 122 and the second rotation-stopping portion 141 provided on the inner periphery of the sealing ring 140, the sealing ring 140 can circumferentially limit the position of the pole 120, thereby effectively preventing the pole 120 from rotating. As a result, the top cover structure 100 manufactured in this manner achieves the torque of the pole 120 required by the customer.

[0046] like Figure 6 As shown, further, in this embodiment, the linear distance between the first plane 12211 and the axis of the terminal 120 is defined as a, and the radius of the column 122 is defined as b, and the relationship between a and b satisfies: ba ≥ 0.5 mm. This arrangement effectively increases the mating area between the first anti-rotation portion 1221 and the second anti-rotation portion 141, thereby improving the anti-rotation capability and effect of the sealing ring 140 on the terminal 120.

[0047] refer to Figure 8 As shown, a second mounting hole 1511 is provided through the lower plastic part 150. The column 122 of the pole 120 is sequentially passed through the second mounting hole 1511 and the first mounting hole 111, and then exposed from the cover plate 110. In this embodiment, the lower plastic part 150 adopts a split structure and includes a first lower plastic split 151 and a second lower plastic split 152 that are detachably connected. The split design of the lower plastic part 150 can shorten the length of the first lower plastic split 151 and the second lower plastic split 152, thereby reducing the aspect ratio of the first lower plastic split 151 and the second lower plastic split 152, and reducing the difficulty of injection molding the first lower plastic split 151 and the second lower plastic split 152. As a result, the thickness of the entire lower plastic part 150 is thinner and the total length is longer, meeting the needs of different usage scenarios. Of course, it is understandable that in other embodiments, in order to improve the production efficiency of the lower plastic part 150 and reduce the difficulty of assembling the lower plastic part 150, the first lower plastic part 151 and the second lower plastic part 152 can also be injection molded as one piece. Therefore, the above two lower plastic parts 150 components are within the scope of protection of this application.

[0048] In this embodiment, the second mounting hole 1511 is provided through the center of the first lower plastic body 151, and the third mounting hole 1521 is provided through the center of the second lower plastic body 152. The opening cross-sectional area of ​​the third mounting hole 1521 is larger than the opening cross-sectional area of ​​the second mounting hole 1511, so that the first lower plastic body 151 overlaps the lower surface of the second lower plastic body 152. In this case, the third mounting hole 1521 is coaxially arranged and connected to the second mounting hole 1511. The pole 120 can pass through the second mounting hole 1511 and the third mounting hole 1521 at the same time. The base 121 of the pole 120 is in contact with the lower surface of the first lower plastic body 151. By clamping the first lower plastic body 151 between the base 121 and the cover 110, the lower plastic component 150 is clamped and mounted on the cover 110.

[0049] In addition, a third stop portion 1512 is provided at a position of the second mounting hole 1511 corresponding to the first stop portion 1221. The third stop portion 1512 is defined as an inner protrusion protruding from the inner circumference of the second mounting hole 1511. In this embodiment, the inner circumference of the second mounting hole 1511 is composed of a third plane 15121 and an arc-shaped surface, so that the inner circumference of the second mounting hole 1511 is "D"-shaped on the horizontal projection plane. During specific manufacturing, the third plane 15121 can also be formed by injection molding. After the first lower plastic split 151 is processed and formed, a portion of the second mounting hole 1511 corresponding to the first stop portion 1221 is transformed from an arc segment to a straight segment. The straight segment forms the above-mentioned inner protrusion, and the straight segment faces the surface of the first stop portion 1221 to form the third plane 15121. By providing the third anti-rotation portion 1512 on the lower plastic component 150 , the cover plate 110 structure can further enhance the circumferential positioning of the pole 120 , thereby further improving the anti-twisting capability of the pole 120 .

[0050] Optionally, in this embodiment, a fourth stop portion 112 is provided at a position of the first mounting hole 111 corresponding to the third stop portion 1512, and the fourth stop portion 112 is defined as an inner protrusion protruding from the inner circumference of the first mounting hole 111. In this embodiment, the inner circumference of the first mounting hole 111 is composed of a fourth plane 1121 and an arc-shaped surface, so that the inner circumference of the first mounting hole 111 also presents a "D" shape on the horizontal projection plane. During specific manufacturing, the fourth plane 1121 can also be formed by integral injection molding. After the cover plate 110 is processed and formed, a portion of the first mounting hole 111 corresponding to the third stop portion 1512 is transformed from an arc segment to a straight segment, and the straight segment forms the above-mentioned inner protrusion, and the surface of the straight segment facing the third stop portion 1512 forms the fourth plane 1121. By providing a fourth anti-rotation portion 112 on the cover plate 110, the rotation of the lower plastic part 150 can be limited by the cover plate 110, thereby improving the circumferential connection stability between the cover plate 110 and the lower plastic part 150, thereby further improving the circumferential limiting ability of the lower plastic part 150 on the pole 120, thereby greatly reducing the possibility of the pole 120 twisting, and making the pole 120 stably and reliably installed.

[0051] Another object of this embodiment is to provide a battery comprising the aforementioned battery housing 200, a single cell, and a top cover structure 100. The single cell is housed within the housing of the battery housing 200, and the cover plate 110 of the top cover structure 100 is sealed against the battery housing 200. By providing the aforementioned top cover structure 100 in the battery, the stability of the installation of the battery terminal 120 can be ensured, thereby improving the overall performance and safety of the battery and extending the battery's service life.

[0052] Throughout this specification, references to terms such as "some embodiments" and "other embodiments" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0053] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Top cover structure, characterized in that, The invention comprises a cover plate (110), a pole (120) and a sealing ring (140); the cover plate (110) is provided with a first mounting hole (111); the pole (120) is passed through the first mounting hole (111); a first rotation-stopping portion (1221) is provided at the outer peripheral surface of the pole (120); the sealing ring (140) is sealingly clamped between the pole (120) and the cover plate (110); a second rotation-stopping portion (141) is provided at a position corresponding to the first rotation-stopping portion (1221); the first rotation-stopping portion (1221) and the second rotation-stopping portion (141) are limitedly matched to realize circumferential limitation of the pole (120).

2. The top cover structure according to claim 1, characterized in that: The first rotation-stopping portion (1221) is defined as an inner recess recessed inward from the outer circumference of the pole (120), and the second rotation-stopping portion (141) is defined as an inner protrusion protruding from the inner circumference of the sealing ring (140) and engaging with the inner recess in a limiting manner.

3. The top cover structure according to claim 2, characterized in that: The first anti-rotation portion (1221) is defined as an outer protrusion protruding outward from the outer peripheral surface of the pole (120), and the second anti-rotation portion (141) is defined as an outer recess recessed inward from the inner peripheral surface of the sealing ring (140) and engaging with the inner protrusion in a limiting manner.

4. The top cover structure according to claim 3, characterized in that: The inner concave surface of the inner recess or the outer convex surface of the outer protrusion is defined as a first plane (12211), and the inner convex surface of the inner protrusion or the outer concave surface of the outer recess is defined as a second plane (1411), and the second plane (1411) is fitly connected to the first plane (12211).

5. The top cover structure according to claim 4, characterized in that: The straight-line distance between the first plane (12211) and the axis of the pole (120) is defined as a, the radius of the pole (120) is defined as b, and a and b satisfy the following condition: ba≥0.5 mm.

6. The roof structure according to any one of claims 1 to 5, characterized in that: The top cover structure (100) also includes a lower plastic part (150), a second mounting hole (1511) is provided through the lower plastic part (150), the pole (120) is passed through the second mounting hole (1511), a third stop portion (1512) is provided at a position of the second mounting hole (1511) corresponding to the first stop portion (1221), and the first stop portion (1221) and the third stop portion (1512) are limited and cooperated to achieve circumferential limitation of the pole (120).

7. The top cover structure according to claim 6, characterized in that: The lower plastic part (150) comprises a first lower plastic split body (151) and a second lower plastic split body (152), the first lower plastic split body (151) is connected to the second lower plastic split body (152), the first lower plastic split body (151) is provided with a second mounting hole (1511) through-through, the second lower plastic split body (152) is provided with a third mounting hole (1521) through-through, the opening cross-sectional area of ​​the third mounting hole (1521) is larger than the opening cross-sectional area of ​​the second mounting hole (1511), the third mounting hole (1521) is coaxially arranged and connected to the second mounting hole (1511), and the pole (120) is provided through the third mounting hole (1521) and the second mounting hole (1511).

8. The top cover structure according to claim 7, characterized in that: The first lower plastic body (151) is detachably connected to the second lower plastic body (152); Alternatively, the first lower plastic body (151) and the second lower plastic body (152) are integrally formed.

9. The top cover structure according to claim 6, characterized in that: The lower plastic part (150) is clamped between the cover plate (110) and the pole (120), and a fourth stop part (112) is provided at a position of the first mounting hole (111) corresponding to the position of the third stop part (1512), and the fourth stop part (112) and the third stop part (1512) are limited and cooperated to achieve circumferential limitation of the lower plastic part (150).

10. A battery, characterized in that The invention comprises a battery housing (200), a single battery cell and a top cover structure (100) according to any one of claims 1 to 9, wherein the battery housing (200) has a receiving cavity, the single battery cell is received in the receiving cavity, and the top cover structure (100) has a sealing cover provided on the battery housing (200).

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