Cover plate and battery cell

Abstract

The utility model belongs to the technical field of new energy batteries, and discloses a cover plate and a battery monomer. The cover plate comprises a top cover sheet, a pole, a sealing ring and lower plastic, and the top cover sheet is provided with a first through hole; the pole penetrates through the first through hole and is mounted on the top cover plate; the sealing ring is clamped between the top cover sheet and the pole; the lower plastic comprises a plastic plate body, the plastic plate body is arranged at the bottom of the top cover piece, the plastic plate body is provided with a second through hole coaxial with the first through hole, the pole penetrates through the second through hole, an annular protrusion is arranged at the bottom of the plastic plate body around the center of the second through hole in a protruding mode, part of the sealing ring is clamped between the annular protrusion and the pole, and the sealing ring is clamped between the annular protrusion and the pole in the width direction of the lower plastic. A material expansion notch is formed in the side wall of the lower plastic, and a material expansion guide rib is arranged between the material expansion notch and the annular protrusion. Through the arrangement, it is guaranteed that the shape precision and the size precision of the lower plastic can meet the design requirements, the assembling efficiency of the lower plastic is guaranteed, and then the production quality and the assembling efficiency of the cover plate are improved.

Description

Technical Field

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

[0002] A battery cell generally includes structures such as a cover plate, a winding core, and an outer cylindrical shell. The cover plate usually includes components such as a top cover sheet, a pole, a lower plastic part, and a sealing ring. The winding core is set in the outer cylindrical shell. A pole piece extends from the top of the winding core and is connected to the pole fixed on the top cover sheet. The lower plastic part fixed under the top cover sheet is installed between the top cover sheet and the top of the winding core, and the top cover sheet and the winding core are insulated and separated by the lower plastic. The sealing ring is sealed and clamped between the pole and the top cover sheet.

[0003] At present, the main method of assembling the cover is to position the top cover, pole, lower plastic and sealing ring, and then install the pole on the top cover by riveting. During the riveting process of the pole, the compression pressure of the sealing ring is released. However, due to the small width of the lower plastic, the pressure release cannot be absorbed, causing the lower plastic to swell and there is a dimensional deviation problem in the width direction, which makes the assembly of the lower plastic difficult, thereby affecting the yield rate of the cover and the production efficiency and quality of the battery.

[0004] Based on the above, there is an urgent need for a cover plate and a battery cell to solve the technical problems existing in the prior art. Utility Model Content

[0005] One purpose of the present utility model is to provide a cover plate, which is used to solve the technical problem that when the existing cover plate is assembled, the lower plastic is affected by the expansion of the material, resulting in a local increase in the width of the lower plastic, making the lower plastic difficult to assemble, thereby affecting the production quality and assembly efficiency of the cover plate.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] The cover plate includes: a top cover sheet, the top cover sheet has a first through hole; a pole, the pole is passed through the first through hole and installed on the top cover sheet; a sealing ring, the sealing ring is clamped between the top cover sheet and the pole; a lower plastic, the lower plastic includes a plastic plate body, the plastic plate body is arranged at the bottom of the top cover sheet, the plastic plate body has a second through hole coaxial with the first through hole, the pole is passed through the second through hole, the bottom of the plastic plate body is provided with an annular protrusion around the center of the second through hole, part of the sealing ring is clamped between the annular protrusion and the pole, and along the width direction of the lower plastic, the side wall of the lower plastic has a material expansion notch, and a material expansion guide rib is provided between the material expansion notch and the annular protrusion.

[0008] Preferably, the material expansion notch includes a first material expansion notch groove, and the first material expansion notch groove is opened on the outer surface of the side wall of the lower plastic.

[0009] Preferably, the diameter of the first material expansion notch is set to d1, 40mm≤d1≤80mm.

[0010] Preferably, the material expansion notch includes a second material expansion notch groove, and the second material expansion notch groove is opened on the bottom surface of the side wall of the lower plastic.

[0011] Preferably, the diameter of the second material expansion notch is set to d2, 5mm≤d2≤15mm.

[0012] Preferably, two material expansion guiding ribs are provided between the first material expansion notch and the annular protrusion, and the two material expansion guiding ribs are arranged in an "eight" shape on the horizontal cross section. Along the direction from the center of the second through hole to the first material expansion notch, the spacing distance between the two material expansion guiding ribs gradually decreases.

[0013] Preferably, a material expansion guiding rib is provided extending between the material expansion notch and the annular protrusion in a direction from the center of the second through hole to the first material expansion notch groove.

[0014] Preferably, along the width direction of the lower plastic, two opposite side walls of the lower plastic are provided with the material expansion notches, and the material expansion guiding ribs are provided between each of the material expansion notches and the annular protrusion.

[0015] Preferably, the plastic plate body includes a first plastic split plate and a second plastic split plate, the first plastic split plate and the second plastic split plate are connected along the length direction of the lower plastic, the first plastic split plate and the second plastic split plate each have a second through hole, and each of the second through holes is provided with an annular protrusion in the circumference, and along the width direction of the lower plastic, the side walls of the first plastic split plate and the side walls of the second plastic split plate are provided with the material expansion notch, and the material expansion guide rib is provided between each of the material expansion notch and the annular protrusion.

[0016] Another object of the present invention is to provide a battery cell, which ensures the quality rate of the battery cell by arranging a cover plate on the battery cell.

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

[0018] A battery cell comprises a shell, a winding core and the aforementioned cover plate, wherein the winding core is arranged in the shell, and the cover plate is buckled into the opening of the shell.

[0019] Beneficial effects of the utility model:

[0020] This embodiment provides a cover plate, which can control the side wall of the lower plastic to become a straight line shape of the expected design target by setting a material expansion notch and a material expansion guide rib on the lower plastic, thereby ensuring that after the cover plate is assembled, the shape accuracy and dimensional accuracy of the lower plastic can meet the design requirements, avoiding the problem of excessive width of the lower plastic, ensuring the assembly efficiency of the lower plastic, and thus improving the production quality and assembly efficiency of the cover plate.

[0021] This embodiment also provides a battery cell. By arranging the above-mentioned cover plate on the battery cell, the cover plate has the above-mentioned lower plastic, so that when the cover plate is assembled, the expansion notch on the lower plastic can absorb the compression pressure released by the sealing ring, and can achieve the effect of the side wall of the lower plastic in the width direction becoming a straight line shape of the expected design target, thereby ensuring that the shape accuracy and dimensional accuracy of the lower plastic meet the design requirements, avoiding the problem of out-of-tolerance of the width dimension of the lower plastic, ensuring the assembly efficiency of the lower plastic, improving the production quality of the cover plate and the assembly efficiency between the cover plate and the shell, and thus ensuring the yield rate of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a top view of the cover plate provided in this embodiment;

[0023] Figure 2 yes Figure 1 Cross-sectional view along AA direction;

[0024] Figure 3 is an exploded view of the structure of the cover plate provided in this embodiment;

[0025] Figure 4 is a bottom view of the first plastic sub-plate provided in this embodiment;

[0026] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle.

[0027] In the picture:

[0028] 1. Top cover; 11. First through hole;

[0029] 2. Pole;

[0030] 3. Sealing ring;

[0031] 4. Lower plastic; 4101. First plastic sub-plate; 4102. Second plastic sub-plate; 411. Second through-hole; 412. Annular protrusion; 413. Material expansion notch; 4131. First material expansion notch groove; 4132. Second material expansion notch groove; 414. Material expansion guide rib; 42. First support portion; 43. Second support portion;

[0032] 5. Apply plastic. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] The technical solution provided by the present invention is described below with reference to the accompanying drawings and specific embodiments.

[0038] Combine Figures 1 to 5 As shown, this embodiment provides a cover plate, which includes a top cover sheet 1, a pole 2, a sealing ring 3, and a lower plastic 4. The specific structures of the above components of the cover plate of this embodiment will be described below.

[0039] In this embodiment, combined with Figure 2 、 Figure 3 As shown, a first through hole 11 is provided through the surface of the top cover sheet 1, and the lower plastic 4 includes a plastic plate body. A second through hole 411 is provided through the surface of the plastic plate body. The second through hole 411 is coaxially arranged with the first through hole 11. A portion of the pole 2 passes upward through the second through hole 411 and the first through hole 11 in sequence. The sealing ring 3 is sandwiched between the top cover sheet 1 and the pole 2 for electrically insulating the top cover sheet 1 and the pole 2.

[0040] In addition, in this embodiment, an annular protrusion 412 is provided on the bottom of the plastic plate around the center of the second through hole 411. Through the action of the annular protrusion 412, when the pole 2 is riveted to the top cover sheet 1, part of the sealing ring 3 will be squeezed between the annular protrusion 412 and the pole 2, thereby filling the gap between the lower plastic 4 and the pole 2, thereby insulating the top cover sheet 1 from the interior of the battery. At the same time, along the width direction of the lower plastic 4, the side wall of the plastic plate has a material expansion notch 413, and a material expansion guiding rib 414 is provided between the material expansion notch 413 and the annular protrusion 412. During the riveting process of the pole 2, the sealing ring 3 is squeezed and deformed, so that part of the sealing ring 3 is squeezed into the gap between the annular protrusion 412 and the pole 2, and the annular protrusion 412 is continuously squeezed, so that the compression pressure of the sealing ring 3 is continuously released to the annular protrusion 412. The setting of the material expansion guiding rib 414 will enable the annular protrusion 412 to expand and flatten the material expansion notch 413 through the guidance and pressure of the material expansion guiding rib 414. In this way, through the expansion guide ribs 414 and the expansion notch 413, the side wall of the lower plastic 4 can be controlled to become a straight line shape of the expected design target, thereby ensuring that after the cover is assembled, the shape accuracy and dimensional accuracy of the lower plastic 4 can meet the design requirements, avoiding the problem of excessive width of the lower plastic 4, ensuring the assembly efficiency of the lower plastic 4, and thus improving the production quality and assembly efficiency of the cover.

[0041] In this embodiment, reference Figure 3 、 Figure 4As shown, the cover plate is equipped with two poles 2, one of which can be defined as a positive pole or a negative pole. Corresponding to the two poles 2, the top cover plate 1 is equipped with two first through holes 11 for assembling the two poles 2. A sealing ring 3 is sandwiched between the top cover plate 1 and each pole 2. The plastic plate body includes a first plastic sub-plate 4101 and a second plastic sub-plate 4102. The first plastic sub-plate 4101 and the second plastic sub-plate 4102 are connected along the length of the lower plastic 4. The first plastic sub-plate 4101 has a second through hole 411 for accommodating one of the poles 2, and the second plastic sub-plate 4102 has a second through hole 411 for accommodating the other pole 2. The second through holes 411 are arranged in a one-to-one correspondence with the first through holes 11. An annular protrusion 412 is provided in the circumference of the two second through holes 411. Along the width direction of the lower plastic 4, the side walls of the first plastic sub-plate 4101 and the side walls of the second plastic sub-plate 4102 are provided with expansion notches 413, and the above-mentioned expansion guide ribs 414 are provided between each expansion notch 413 and the annular protrusion 412, so that the width dimensions of the position portions of the lower plastic 4 close to the two sealing rings 3 can be deformed to the expected design target straight line shape through the action of the expansion guide ribs 414 and the expansion notches 413, so as to be consistent with the width dimensions of other position portions on the lower plastic 4, thereby ensuring the production quality of the lower plastic 4 equipped with two poles 2.

[0042] It should be noted that since the structures of the first plastic sub-panel 4101 and the second plastic sub-panel 4102 are the same or similar, in order to describe this solution more clearly and concisely, only the first plastic sub-panel 4101 and the related components connected to the first plastic sub-panel 4101 will be described in detail below.

[0043] Further, refer to Figure 4 As shown, along the width direction of the first plastic split plate 4101, two opposite side walls of the first plastic split plate 4101 are provided with expansion notches 413, and expansion guide ribs 414 are provided between each expansion notch 413 and the annular protrusion 412 to ensure that the annular protrusion 412 can expand evenly to both sides during the process of being squeezed and expanded by the sealing ring 3, so that the opposite sides of the first plastic split plate 4101 can maintain a straight shape, thereby further ensuring the production quality of the lower plastic 4.

[0044] Specifically, refer to Figure 5As shown, in this embodiment, the material expansion notch 413 includes a first material expansion notch groove 4131, and the first material expansion notch groove 4131 is opened on the outer surface of the side wall of the first plastic sub-plate 4101, so that when the first plastic sub-plate 4101 is expanded, the expanded part of the first plastic sub-plate 4101 can be directly compensated in a straight line in the first material expansion notch groove 4131 through the material expansion guide rib 414, thereby ensuring the filling uniformity of the first material expansion notch groove 4131 and improving the molding quality.

[0045] Optionally, the diameter of the first material expansion notch groove 4131 is set to d1, 40mm≤d1≤80mm, for example, d1 can be 40mm, 50mm, 60mm, 70mm or 80mm, etc. Those skilled in the art can make adjustments according to the actual material expansion situation so that the space formed by the first material expansion notch groove 4131 can meet the compensation requirement for the first material expansion notch groove 4131 under actual working conditions. This article does not limit this.

[0046] More specifically, continue to refer to Figure 5 As shown, in this embodiment, the expansion notch 413 also includes a second expansion notch groove 4132, which is opened on the bottom surface of the side wall of the first expansion body. As the temperature increases, the expansion becomes more pronounced. Therefore, in addition to increasing the diameter of the first expansion notch groove 4131 to meet the expansion requirements, the second expansion notch groove 4132 can be provided so that when the first plastic panel 4101 expands, the expanded portion of the first plastic panel 4101 can be simultaneously filled in the first expansion notch groove 4131 and the second expansion notch groove 4132. The auxiliary effect of the second expansion notch groove 4132 ensures that the expanded portion of the first plastic panel 4101 is fully absorbed by the expansion notch 413, ensuring that the width of the first plastic panel 4101 can achieve the desired straight shape. Furthermore, by pre-designing the diameter of the second expansion notch groove 4132, the thickness of the first plastic panel 4101 can be prevented from exceeding the tolerance.

[0047] For example, the diameter of the second material expansion notch 4132 is set to d2, and d2 satisfies the following: 5mm≤d2≤15mm. For example, d2 can be 5mm, 7mm, 9mm, 11mm, 13mm, or 15mm. Similar to d1, those skilled in the art can adjust it according to the actual material expansion conditions to ensure that the space formed by the second material expansion notch 4132 can meet the compensation requirements for the second material expansion notch 4132 under actual working conditions. This document does not limit this.

[0048] Optionally, in this embodiment, two material expansion guiding ribs 414 can be further provided between the first material expansion notch groove 4131 and the annular protrusion 412. The two material expansion guiding ribs 414 are arranged in an "eight" shape on the horizontal cross section. Along the direction from the center of the second through hole 411 to the first material expansion notch groove 4131, the spacing distance between the two material expansion guiding ribs 414 gradually decreases, so that the two material expansion guiding ribs 414 can more effectively guide the expanded part of the lower plastic 4 to flow along the specified direction, ensuring the uniformity and stability of the expanded material, and can effectively improve the concave and convex corrugated structure on the side wall of the first plastic sub-plate 4101 when only one material expansion guiding rib 414 is provided, thereby ensuring the flatness of the side wall of the first plastic sub-plate 4101.

[0049] Of course, in other embodiments, a material expansion guide rib 414 can also be extended between the first material expansion notch 4131 and the annular protrusion 412 in the direction from the center of the second through hole 411 to the first material expansion notch 4131, so that when the lower plastic 4 expands, the first material expansion notch 4131 can be flattened by the pressure of this material expansion guide rib 414. The structure is simple and has a certain degree of reliability.

[0050] Optionally, refer to Figure 2 and Figure 3 As shown, the cover provided in this embodiment further includes an upper plastic 5, which is sandwiched between the pole 2 and the top cover sheet 1 and formed by an injection molding process. The upper plastic 5 is formed into a closed annular structure to cover the circumferential side wall of the pole 2, thereby ensuring the reliability of the connection between the pole 2 and the top cover sheet 1.

[0051] Another object of this embodiment is to provide a battery cell, comprising a housing, a winding core, and the aforementioned cover plate, wherein the winding core is disposed within the housing, and the cover plate is snap-fitted to the opening of the housing. By disposing the aforementioned cover plate on the battery cell, the cover plate having the aforementioned lower plastic 4, so that when the cover plate is assembled, the expansion notch 413 on the lower plastic 4 can absorb the compression pressure released by the sealing ring 3, and can achieve the effect of achieving the effect of the side wall of the lower plastic 4 in the width direction becoming the desired straight line shape, thereby ensuring that the shape accuracy and dimensional accuracy of the lower plastic 4 meet the design requirements, avoiding the problem of the width dimension of the lower plastic 4 exceeding the tolerance, ensuring the assembly efficiency of the lower plastic 4, improving the production quality of the cover plate and the assembly efficiency between the cover plate and the housing, and thus ensuring the yield rate of the battery cell.

[0052] refer to Figure 3As shown, the lower plastic 4 provided in this embodiment also includes a first support portion 42. Along the length direction of the lower plastic 4, a first support portion 42 is provided at each end of the plastic plate body, that is, a first support portion 42 is provided at the bottom of the first plastic sub-plate 4101 and the bottom of the second plastic sub-plate 4102. The first support portion 42 can abut against the area of ​​the winding core close to the edge, so that the first support portion 42 can fix the winding core in the thickness direction of the lower plastic 4, so that the winding core will not move in the outer shell along the thickness direction of the lower plastic 4.

[0053] Optionally, the lower plastic 4 provided in this embodiment also includes a second support portion 43, and the two ends of the second support portion 43 are respectively connected to the first plastic split plate 4101 and the second plastic split plate 4102, and the protruding direction of the second support portion 43 is the same as the protruding direction of the first support portion 42. The second support portion 43 can support the winding core in the middle position of the lower plastic 4, thereby suppressing the movement of the winding core in the middle position of the lower plastic 4, thereby effectively ensuring the installation stability of the winding core in the outer shell.

[0054] 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.

[0055] 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. Cover plate, characterized in that, include: A top cover sheet (1), the top cover sheet (1) having a first through hole (11); A pole (2), the pole (2) passing through the first through hole (11) and mounted on the top cover sheet (1); A sealing ring (3), the sealing ring (3) being sandwiched between the top cover sheet (1) and the pole (2); The lower plastic (4) comprises a plastic plate body, the plastic plate body is arranged at the bottom of the top cover sheet (1), the plastic plate body has a second through hole (411) coaxial with the first through hole (11), the pole (2) is passed through the second through hole (411), the bottom of the plastic plate body is provided with an annular protrusion (412) convexly around the center of the second through hole (411), a portion of the sealing ring (3) is clamped between the annular protrusion (412) and the pole (2), and along the width direction of the lower plastic (4), the side wall of the lower plastic (4) has a material expansion notch (413), and a material expansion guide rib (414) is provided between the material expansion notch (413) and the annular protrusion (412).

2. The cover plate according to claim 1, wherein: The material expansion notch (413) includes a first material expansion notch groove (4131), and the first material expansion notch groove (4131) is opened on the outer surface of the side wall of the lower plastic (4).

3. The cover plate according to claim 2, wherein: The diameter of the first expansion notch (4131) is set to d1, 40mm≤d1≤80mm.

4. The cover plate according to claim 2, wherein: The material expansion notch (413) includes a second material expansion notch groove (4132), and the second material expansion notch groove (4132) is opened on the bottom surface of the side wall of the lower plastic (4).

5. The cover plate according to claim 4, characterized in that: The diameter of the second material expansion notch (4132) is set to d2, 5mm≤d2≤15mm.

6. The cover plate according to claim 2, wherein: Two material expansion guiding ribs (414) are provided between the first material expansion notch groove (4131) and the annular protrusion (412). The two material expansion guiding ribs (414) are arranged in an "eight" shape on a horizontal cross section. Along the direction from the center of the second through hole (411) to the first material expansion notch groove (4131), the spacing between the two material expansion guiding ribs (414) gradually decreases.

7. The cover plate according to claim 2, wherein: Along the direction from the center of the second through hole (411) to the first material expansion notch groove (4131), a material expansion guide rib (414) is extended between the material expansion notch (413) and the annular protrusion (412).

8. The cover plate according to any one of claims 1 to 7, characterized in that: Along the width direction of the lower plastic (4), the two opposite side walls of the lower plastic (4) are provided with the material expansion notches (413), and the material expansion guide ribs (414) are provided between each of the material expansion notches (413) and the annular protrusion (412).

9. The cover plate according to any one of claims 1 to 7, characterized in that: The plastic plate body includes a first plastic sub-plate (4101) and a second plastic sub-plate (4102), the first plastic sub-plate (4101) and the second plastic sub-plate (4102) are connected along the length direction of the lower plastic (4), the first plastic sub-plate (4101) and the second plastic sub-plate (4102) are each provided with a second through hole (411), and each second through hole (411) is provided with an annular protrusion (412) in the circumference, and along the width direction of the lower plastic (4), the side walls of the first plastic sub-plate (4101) and the side walls of the second plastic sub-plate (4102) are provided with the material expansion notch (413), and the material expansion guide rib (414) is provided between each material expansion notch (413) and the annular protrusion (412).

10. A battery cell, characterized in that It comprises a shell, a winding core and a cover plate according to any one of claims 1 to 9, wherein the winding core is arranged in the shell, and the cover plate is buckled into the opening of the shell.

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