Secondary battery top cover, top cover assembly and secondary battery

Abstract

The application relates to a secondary battery top cover, a top cover assembly and a secondary battery. The secondary battery top cover comprises a top cover sheet body, two ends of the top cover sheet body are respectively provided with an upper pole column hole penetrating through the top cover sheet body, and the bottom surface of the top cover sheet body is provided with a sunken groove surrounding the outer periphery of the upper pole column hole; the top cover reinforcing rib comprises a first reinforcing ring protruding from the top surface of the top cover sheet body and surrounding the outer periphery of the upper pole column hole, and a second reinforcing ring protruding from the bottom surface of the top cover sheet body and surrounding the outer periphery of the sunken groove. The application is provided with the first reinforcing ring surrounding the outer periphery of the upper pole column hole on the top surface of the top cover sheet body, and the second reinforcing ring protruding from the bottom surface of the top cover sheet body and surrounding the outer periphery of the sunken groove, the first reinforcing ring and the second reinforcing ring can locally reinforce the top cover sheet body with reduced thickness, improve the air tightness of the pole column conductor mounting area, reduce the production cost, and improve the energy density of the secondary battery.

Description

Technical Field

[0001] This application relates to the field of secondary battery technology, and in particular to a secondary battery top cover, top cover assembly and secondary battery. Background Technology

[0002] The top cover assembly is an important component of the battery, covering the opening in the battery casing. The main component of the top cover assembly is the top cover itself, which is a long, thin sheet. In existing technologies, one approach to increasing battery energy density is to increase the volume of the battery cell. However, the larger the cell volume, the thinner the top cover needs to be without changing the overall dimensions of the secondary battery.

[0003] Because the top cover is a long, thin sheet, its bending resistance decreases as the cell size increases. To ensure the airtightness of the terminal mounting area, the sealing flange of the top cover needs sufficient strength to minimize deformation under conditions of cell gas circulation and extreme runaway.

[0004] Therefore, in order to ensure the sealing and safety performance of the battery, a thicker top cover sheet is required to improve its structural strength. However, this also makes it difficult to use thicker top cover sheet materials, resulting in higher costs and making it difficult to improve the battery energy density. Summary of the Invention

[0005] This application provides a secondary battery top cover, a top cover assembly, and a secondary battery to solve the problem in related technologies that in order to ensure the sealing and safety performance of the battery, a thicker top cover sheet is required to improve its structural strength, but this also leads to the difficulty in using thicker top cover sheet materials, higher costs, and difficulty in improving battery energy density.

[0006] The first aspect of this application provides a secondary battery top cover, comprising: The top cover plate body has upper pole holes that penetrate the top cover plate body at both ends, and a groove surrounding the upper pole holes is provided on the bottom surface of the top cover plate body. The top cover reinforcing rib includes a first reinforcing ring protruding from the top surface of the top cover body and surrounding the outer periphery of the upper pole post hole, and a second reinforcing ring protruding from the bottom surface of the top cover body and surrounding the outer periphery of the sink.

[0007] In some embodiments: the upper pole hole is a circular through hole, the first reinforcing ring is a rectangular ring structure with an inner circle and an outer square, and the groove is a rectangular groove structure with an inner circle and an outer square.

[0008] In some embodiments: the thickness of the top cover body is t, the distance between the top surface of the first reinforcing ring and the sink is 0.6t to 1.1t, and the distance between the bottom surface of the second reinforcing ring and the top surface of the top cover body is t to 1.25t.

[0009] In some embodiments: the projection of the groove in the thickness direction of the top cover plate body covers the first reinforcing ring, and the first reinforcing ring, the second reinforcing ring and the top cover plate body are integrally stamped.

[0010] In some embodiments, the width of the cross-section of the second reinforcing ring is smaller than the thickness of the top cover plate body.

[0011] In some embodiments, the top cover plate body is further provided with an injection hole and an explosion-proof hole located between the upper pole hole.

[0012] A second aspect of this application provides a secondary battery top cover assembly, including the secondary battery top cover described in any of the above embodiments; And a lower plastic piece connected to the bottom surface of the top cover body, wherein both ends of the lower plastic piece are provided with protrusions that protrude from the top surface of the lower plastic piece and extend into the recess of the top cover body. The protrusion has a lower electrode hole that connects to the upper electrode hole. An electrode conductor is connected to the upper electrode hole and the lower electrode hole. A sealing ring is sealed between the electrode conductor and the top cover body. The sealing ring is located inside the lower electrode hole.

[0013] In some embodiments: the top surface of the lower plastic is provided with a lower annular groove surrounding the outer periphery of the boss, the second reinforcing ring is located in the lower annular groove, and the top surface of the top cover body is provided with an upper plastic that separates the pole conductor and the top cover body.

[0014] In some embodiments: the bottom surface of the upper plastic is provided with an upper annular groove, and the first reinforcing ring is located in the upper annular groove.

[0015] A third aspect of this application provides a secondary battery, comprising: The battery casing has an open top and is closed on all sides, and the battery cell is located inside the battery casing. The battery cell is connected to a transfer conductor, and the secondary battery top cover assembly described in any of the above embodiments closes the top opening of the battery casing. The transfer conductor is fixedly connected to the terminal conductor.

[0016] The beneficial effects of the technical solution provided in this application include: This application provides a secondary battery top cover, a top cover assembly, and a secondary battery. The secondary battery top cover of this application is provided with a top cover sheet body. The two ends of the top cover sheet body are respectively provided with upper electrode post holes that penetrate the top cover sheet body. The bottom surface of the top cover sheet body is provided with a groove surrounding the outer periphery of the upper electrode post hole. The top cover reinforcing rib includes a first reinforcing ring protruding from the top surface of the top cover sheet body and surrounding the outer periphery of the upper electrode post hole, and a second reinforcing ring protruding from the bottom surface of the top cover sheet body and surrounding the outer periphery of the groove.

[0017] Therefore, the secondary battery top cover of this application has upper electrode post holes for installing electrode post conductors at both ends of the top cover sheet body. A recessed groove surrounding the upper electrode post holes is provided on the bottom surface of the top cover sheet body. This recessed groove is used to install and seal the sealing ring between the top cover sheet body and the electrode post conductors. To enhance the structural strength of the top cover sheet body at the sealing ring sealing area, a first reinforcing ring surrounding the upper electrode post holes is provided on the top surface of the top cover sheet body, and a second reinforcing ring protrudes from the bottom surface of the top cover sheet body and surrounds the recessed groove. The first and second reinforcing rings can locally reinforce the thinned top cover sheet body, improve the airtightness of the electrode post conductor installation area, reduce production costs, and increase the energy density of the secondary battery. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a front view of the structure of the secondary battery top cover according to an embodiment of this application; Figure 2 This is a top view of the secondary battery top cover according to an embodiment of this application; Figure 3 This is a bottom view of the structure of the secondary battery top cover according to an embodiment of this application; Figure 4 This is a top view of the secondary battery top cover assembly according to an embodiment of this application; Figure 5 for Figure 4 A sectional view along the I-I direction; Figure 6 for Figure 5 A magnified view of a portion of point A in the middle.

[0020] Figure label: 10. Secondary battery top cover; 11. Top cover body; 12. Sink; 13. First reinforcing ring; 14. Second reinforcing ring; 15. Upper electrode post hole; 16. Explosion-proof hole; 17. Injection hole; 20. Secondary battery top cover assembly; 21. Lower plastic; 22. Electrode post conductor; 23. Sealing ring; 24. Upper plastic; 25. Boss; 26. Lower annular groove; 27. Upper annular groove. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] This application provides a secondary battery top cover, top cover assembly, and secondary battery, which can solve the problem in related technologies that in order to ensure the sealing and safety performance of the battery, a thicker top cover sheet is required to improve its structural strength, but this also leads to the difficulty in using thicker top cover sheet materials, higher costs, and difficulty in improving battery energy density.

[0023] See Figures 1 to 3 As shown, a first aspect of this application provides a secondary battery top cover, the secondary battery top cover 10 comprising: The top cover plate body 11 is a metal sheet structure with a set thickness. At both ends of the top cover plate body 11, there are upper pole hole 15 that penetrate the top cover plate body 11. The upper pole hole 15 is used to insert and install the pole conductor 22. The bottom surface of the top cover plate body 11 is provided with a groove 12 surrounding the upper pole hole 15.

[0024] The top cover reinforcing rib includes a first reinforcing ring 13 protruding from the top surface of the top cover body 11 and surrounding the outer periphery of the upper pole hole 15, and a second reinforcing ring 14 protruding from the bottom surface of the top cover body 11 and surrounding the outer periphery of the recess 12. Both upper pole holes 15 are circular through holes, the first reinforcing ring 13 is a rectangular ring structure with an inner circle and an outer square, and the recess 12 is a rectangular groove structure with an inner circle and an outer square.

[0025] In this embodiment of the secondary battery top cover, upper electrode post holes 15 for mounting electrode post conductors 22 are respectively opened at both ends of the top cover body 11. A recessed groove 12 is provided on the bottom surface of the top cover body 11, surrounding the upper electrode post holes 15. The recessed groove 12 is used to install and seal the sealing ring 23 of the top cover body 11 and the electrode post conductors 22. In order to improve the energy density of the battery, the thickness of the top cover body 11 in this embodiment of the application is reduced by 25%-40%.

[0026] To enhance the structural strength of the top cover plate body 11 at the sealing portion of the sealing ring 23, a first reinforcing ring 13 is provided on the top surface of the top cover plate body 11, surrounding the outer periphery of the upper electrode post hole 15, and a second reinforcing ring 14 protrudes from the bottom surface of the top cover plate body 11 and surrounds the outer periphery of the recess 12. The first reinforcing ring 13 and the second reinforcing ring 14 can locally reinforce the top cover plate body 11 after the thickness reduction, improve the airtightness of the electrode post conductor mounting area, reduce production costs, and increase the energy density of the secondary battery.

[0027] In some alternative embodiments: see Figures 1 to 3 As shown, this application embodiment provides a secondary battery top cover. The thickness of the top cover body 11 of the secondary battery top cover 10 is t, the distance between the top surface of the first reinforcing ring 13 and the sink 12 is 0.6t to 1.1t, and the distance between the bottom surface of the second reinforcing ring 14 and the top surface of the top cover body 11 is t to 1.25t.

[0028] The projection of the sink 12 onto the thickness of the top cover plate body 11 covers the first reinforcing ring 13. The first reinforcing ring 13, the second reinforcing ring 14, and the top cover plate body 11 are integrally stamped from aluminum plates. The width of the cross-section of the second reinforcing ring 14 is smaller than the thickness of the top cover plate body 11. An injection hole 17 and an explosion-proof hole 16 are also provided on the top cover plate body 11, located between the two upper pole post holes 15.

[0029] See Figures 4 to 6 As shown, a second aspect of the present application provides a secondary battery top cover assembly. The secondary battery top cover assembly 20 includes the secondary battery top cover 10 described in any of the above embodiments; and a lower plastic 21 connected to the bottom surface of the top cover body 11. Both ends of the lower plastic 21 are provided with bosses 25 that protrude from the top surface of the lower plastic 21 and extend into the groove 12 of the top cover body 11.

[0030] A lower electrode hole is provided on the boss 25, which is connected to the upper electrode hole 15. The upper electrode hole 15 and the lower electrode hole are connected to the electrode conductor 22. A sealing ring 23 is provided between the electrode conductor 22 and the top cover plate body 11. The sealing ring 23 is located in the lower electrode hole and is used to seal the gap between the electrode conductor 22 and the top cover plate body 11.

[0031] The top surface of the lower plastic 21 has a lower annular groove 26 surrounding the outer periphery of the boss 25. The second reinforcing ring 14 is located within the lower annular groove 26. The top surface of the top cover body 11 has an upper plastic 24 separating the electrode conductor 22 and the top cover body 11. The bottom surface of the upper plastic 24 has an upper annular groove 27, and the first reinforcing ring 13 is located within the upper annular groove 27.

[0032] In this embodiment, both ends of the lower plastic 21 are provided with bosses 25 that protrude from the top surface of the lower plastic 21 and extend into the groove 12 of the top cover body 11. A lower electrode hole communicating with the upper electrode hole 15 is provided on the bosses 25. The lower electrode hole is not only used to install the electrode conductor 22, but also to install and limit the sealing ring 23 between the electrode conductor 22 and the top cover body 11.

[0033] The second reinforcing ring 14 is located in the lower annular groove 26, and the first reinforcing ring 13 is located in the upper annular groove 27. This can significantly reduce the thickness of the secondary battery top cover assembly in the height direction, thereby providing more space for the battery cell and providing space for increasing the energy density of the secondary battery.

[0034] A third aspect of this application provides a secondary battery, comprising: The battery casing has an open top and is closed on all sides, and the battery cell is located inside the battery casing. The battery cell is connected to a transfer conductor, and the secondary battery top cover assembly 20 described in any of the above embodiments closes the top opening of the battery casing. The transfer conductor is fixedly connected to the terminal conductor 22.

[0035] Working principle This application provides a secondary battery top cover, a top cover assembly, and a secondary battery. The secondary battery top cover 10 of this application is provided with a top cover body 11. The top cover body 11 has upper electrode post holes 15 that penetrate through the top cover body 11 at both ends. The bottom surface of the top cover body 11 is provided with a groove 12 surrounding the upper electrode post hole 15. The top cover reinforcing rib includes a first reinforcing ring 13 that protrudes from the top surface of the top cover body 11 and surrounds the upper electrode post hole 15, and a second reinforcing ring 14 that protrudes from the bottom surface of the top cover body 11 and surrounds the groove 12.

[0036] Therefore, the secondary battery top cover of this application has upper electrode post holes 15 at both ends of the top cover body 11 for installing the electrode post conductor 22. A recessed groove 12 surrounding the upper electrode post holes 15 is provided on the bottom surface of the top cover body 11. This recessed groove 12 is used to install and seal the sealing ring 23 of the top cover body 11 and the electrode post conductor 22. To enhance the structural strength of the top cover body 11 at the sealing portion of the sealing ring 23, a first reinforcing ring 13 surrounding the upper electrode post holes 15 is provided on the top surface of the top cover body 11, and a second reinforcing ring 14 protruding from the bottom surface of the top cover body 11 and surrounding the recessed groove 12 is provided. The first reinforcing ring 13 and the second reinforcing ring 14 can locally reinforce the thinned top cover body 11, improve the airtightness of the electrode post conductor installation area, reduce production costs, and increase the energy density of the secondary battery.

[0037] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0038] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0039] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A top cover for a secondary battery, characterized in that, include: The top cover plate body (11) has upper pole hole (15) through the top cover plate body (11) at both ends, and a groove (12) surrounding the upper pole hole (15) is provided on the bottom surface of the top cover plate body (11). The top cover reinforcing rib includes a first reinforcing ring (13) protruding from the top surface of the top cover body (11) and surrounding the outer periphery of the upper pole hole (15), and a second reinforcing ring (14) protruding from the bottom surface of the top cover body (11) and surrounding the outer periphery of the sink (12).

2. The secondary battery top cover as described in claim 1, characterized in that: The upper pole hole (15) is a circular through hole, the first reinforcing ring (13) is a rectangular ring structure with an inner circle and an outer square, and the sink groove (12) is a rectangular groove structure with an inner circle and an outer square.

3. A secondary battery top cover as described in claim 1 or 2, characterized in that: The thickness of the top cover body (11) is t, the distance between the top surface of the first reinforcing ring (13) and the sink (12) is 0.6t to 1.1t, and the distance between the bottom surface of the second reinforcing ring (14) and the top surface of the top cover body (11) is t to 1.25t.

4. A secondary battery top cover as described in claim 2, characterized in that: The projection of the groove (12) on the thickness direction of the top cover body (11) covers the first reinforcing ring (13), and the first reinforcing ring (13), the second reinforcing ring (14) and the top cover body (11) are integrally stamped.

5. A secondary battery top cover as described in claim 3, characterized in that: The width of the cross section of the second reinforcing ring (14) is smaller than the thickness of the top cover body (11).

6. A secondary battery top cover as described in claim 3, characterized in that: The top cover body (11) is also provided with an injection hole (17) and an explosion-proof hole (16) located between the two upper pole holes (15).

7. A secondary battery top cover assembly, characterized in that, Includes the secondary battery top cover (10) as described in any one of claims 1 to 6; And a lower plastic (21) connected to the bottom surface of the top cover body (11), both ends of the lower plastic (21) are provided with protrusions (25) that protrude from the top surface of the lower plastic (21) and extend into the groove (12) of the top cover body (11). The boss (25) has a lower pole hole that connects to the upper pole hole (15). The upper pole hole (15) and the lower pole hole are connected to a pole conductor (22). A sealing ring (23) is sealed between the pole conductor (22) and the top cover body (11). The sealing ring (23) is located inside the lower pole hole.

8. A secondary battery top cover assembly as described in claim 7, characterized in that: The top surface of the lower plastic (21) is provided with a lower annular groove (26) surrounding the outer periphery of the boss (25), and the second reinforcing ring (14) is located in the lower annular groove (26). The top surface of the top cover body (11) is provided with an upper plastic (24) separating the pole conductor (22) and the top cover body (11).

9. A secondary battery top cover assembly as described in claim 8, characterized in that: The bottom surface of the upper plastic (24) is provided with an upper annular groove (27), and the first reinforcing ring (13) is located in the upper annular groove (27).

10. A secondary battery, characterized in that, include: A battery casing with an open top and closed sides, and a battery cell located inside the battery casing, the battery cell being connected to a transfer conductor, and a secondary battery top cover assembly (20) according to any one of claims 7 to 9 that closes the top opening of the battery casing, the transfer conductor being fixedly connected to the terminal conductor (22).

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