Cover plate structure, battery and battery pack

Abstract

A cover plate structure, a battery and a battery pack. The cover plate structure (100) comprises a cover plate (10), a terminal (20) and a sealing pin (30), wherein a recess (21) is formed in the terminal (20), the upper surface of the terminal (20) is a first flat surface (22), the wall of the recess (21) comprises a first segment surface (23), and the first segment surface (23) and the first flat surface (22) are joined and form an angle of θ2; and the sealing pin (30) is arranged in the recess (21) and is welded to the terminal (20), the upper surface of the sealing pin (30) is a second flat surface (31), the side wall of the sealing pin (30) comprises a first section surface (32), and the first section surface (32) and the second flat surface (31) are joined and form an angle of θ1, wherein θ1≥θ2.

Description

Cover structure, battery and battery pack

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on August 23, 2023, with application number 2023222762100. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a cover plate structure, a battery, and a battery pack. Background Art

[0003] Lithium-ion batteries have the advantages of high energy density, fast charging and discharging, long cycle life, and no pollution. They have been widely used in portable electronic devices, communications, energy storage and electric vehicles.

[0004] Among lithium-ion batteries, there is a type called a cylindrical battery. These batteries consist of a housing, a winding core housed within the housing, and a cover plate for the housing, which houses the terminal post. During the production of cylindrical batteries, holes must be drilled into the terminal post to facilitate the external penetration welding process between the terminal post and the positive current collector disc. After welding the terminal post and the positive current collector disc, sealing pins are typically used to weld the hole area to the terminal post to ensure a tight seal and structural strength. Technical issues

[0005] In the sealing method of the related art, since the placement position of the sealing pin in the pole hole cannot be determined, poor welding is likely to occur after welding, such as warping and bulging. Technical Solutions

[0006] In a first aspect, the present application provides a cover plate structure, comprising:

[0007] cover;

[0008] A pole connected to the cover plate, with a groove formed on the pole. The plane where the upper surface of the pole is located is a first plane. The groove wall includes at least a first section. The first section is connected to the first plane, and the angle between the first section and the first plane is θ2.

[0009] The sealing pin is arranged in the groove and is welded to the pole. The plane where the upper surface of the sealing pin is located is the second plane. The side wall of the sealing pin includes at least a first surface. The first surface and the second plane are connected. The angle between the first surface and the second plane is θ1; wherein θ1≥θ2.

[0010] In a second aspect, the present application provides a battery, comprising:

[0011] case;

[0012] A winding core is disposed in the shell;

[0013] The cover plate structure provided in the present application is configured to cover a shell.

[0014] In a third aspect, the present application provides a battery pack comprising the battery provided in the present application. Beneficial effects

[0015] The beneficial effects of the cover structure, battery and battery pack provided by the present application are as follows: when the sealing pin and the pole are welded, since the angle θ1 between the first portion and the second plane of the sealing pin is greater than or equal to the angle θ2 between the first section and the first plane of the groove, when the sealing pin is placed in the groove of the pole, the side wall of the sealing pin can be supported by the groove wall of the groove, and the groove wall of the groove can limit the placement position of the sealing pin, and the sealing pin can be adjusted to be placed flat in the groove, and the gap between the sealing pin and the groove wall can be ensured to be as uniform as possible. Compared with the method of setting the angle θ1 between the first portion and the second plane to be smaller than the angle θ2 between the first section and the first plane of the groove, the present application can avoid the sealing pin from warping, bulging and poor welding after placing the sealing pin in the groove for welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a schematic structural diagram of a battery provided by the present application;

[0017] FIG2 is a schematic cross-sectional view of the battery in FIG1 ;

[0018] FIG3 is an enlarged schematic diagram of point I in FIG2 ;

[0019] FIG4 is a schematic structural diagram of the pole in FIG3 ;

[0020] FIG5 is a schematic structural diagram of the sealing nail in FIG3 ;

[0021] FIG6 is a schematic diagram of the matching of a pole and a sealing nail in the related art.

[0022] The meanings of the reference numerals are as follows:

[0023] 100-cover structure, 10-cover, 20-pole, 21-groove, 22-first plane, 23-first section, 24-second section, 30-sealing pin, 31-second plane, 32-first surface, 33-second surface, 34-arc transition surface, 200-battery, 40-housing, 50-winding core. Modes for Carrying Out the Invention

[0024] Please refer to FIG6 , which illustrates the mating arrangement of the terminal 20 and the sealing pin 30 on the cover plate 10 in the related art. The terminal 20 is provided with a groove 21, and the sealing pin 30 is disposed within the groove 21. The groove wall of the groove 21 has an inclination angle α relative to the upper surface of the terminal 20, and the side wall of the sealing pin 30 has an inclination angle β relative to the upper surface of the sealing pin 30. In the related art design, α>β. Therefore, when the sealing pin 30 is placed in the groove 21 for welding, the small inclination angle of the sealing pin 30 makes it difficult to determine its placement within the groove 21. The sealing pin 30 cannot be placed flat within the groove 21, but is tilted. This also results in excessive clearance between the sealing pin 30 and certain areas of the groove 21, resulting in poor welding after welding, such as warping and protrusions. Therefore, it is necessary to improve the mating arrangement of the sealing pin 30 and the groove 21 in the related art to improve the poor welding that occurs after the sealing pin 30 is welded within the terminal 20.

[0025] Please refer to FIG. 2 to FIG. 5 , which illustrate a cover plate structure 100 provided in an embodiment of the present application, including a cover plate 10 , a pole 20 , and a sealing nail 30 .

[0026] 2 to 5 , the pole 20 is connected to the cover plate 10 , and a groove 21 is provided on the pole 20 . The plane where the upper surface of the pole 20 lies is a first plane 22 , and the groove wall of the groove 21 includes at least a first section 23 , which is connected to the first plane 22 , and the angle between the first section 23 and the first plane 22 is θ2 ; a sealing nail 30 is provided in the groove 21 and is welded to the pole 20 , and the plane where the upper surface of the sealing nail 30 lies is a second plane 31 , and the side wall of the sealing nail 30 includes at least a first surface 32 , which is connected to the second plane 31 , and the angle between the first surface 32 and the second plane 31 is θ1 ; wherein θ1 ≥ θ2 .

[0027] In the cover plate structure 100 provided in the embodiment of the present application, when the sealing pin 30 and the pole 20 are welded, since the angle θ1 between the first surface 32 and the second plane 31 of the sealing pin 30 is greater than or equal to the angle θ2 between the first section 23 and the first plane 22 of the groove 21, when the sealing pin 30 is placed in the groove 21 of the pole 20, the side wall of the sealing pin 30 can be supported by the groove wall of the groove 21, and the groove wall of the groove 21 can limit the placement position of the sealing pin 30. The sealing pin 30 can be adjusted to be placed flat in the groove 21, and the gap between the sealing pin 30 and the groove wall of the groove 21 can be ensured to be as uniform as possible. Compared with the method of setting the angle θ1 between the first surface 32 and the second plane 31 to be smaller than the angle θ2 between the first section 23 and the first plane 22 of the groove 21, in this embodiment, after the sealing pin 30 is placed in the groove 21 for welding, warping, bulging and poor welding can be avoided.

[0028] Among them, corresponding to the setting mode of θ1≥θ2, the outer diameter D1 of the sealing pin 30 of this embodiment ranges from 3 mm to 20 mm, the diameter D2 of the groove 21 ranges from 3 mm to 30 mm, and D2≥D1. For example, when θ1=θ2 is set, the side wall of the sealing pin 30 just contacts the groove wall of the groove 21, and the two are clearance-fitted. At this time, the gap can be set to 0, and D2=D1. For example, when the outer diameter of the sealing pin 30 is 3 mm, the diameter of the groove 21 is also 3 mm; when θ1>θ2 is set, if the sealing pin 30 needs to be placed in the groove 21, the outer diameter D1 of the sealing pin 30 and the outer diameter D2 of the groove 21 need to satisfy that D2 is greater than D1. For example, when the diameter D1 of the sealing pin 30 is set to 3 mm, the outer diameter D2 of the groove 21 can be set to 3.5 mm, so that the sealing pin 30 with a larger inclination angle can be placed in the groove 21, and the placement position in the groove 21 can be adjusted.

[0029] In one embodiment, in order to facilitate the production of the sealing pin 30 and the opening of the groove 21, θ1>θ2 and D2>D1 are set in this embodiment to avoid the situation where θ1=θ2 and D2=D1 may be equal due to production errors. At the same time, due to production errors, D2 may not be exactly the same size as D1, which will eventually cause the sealing pin 30 to be uneven when placed in the groove 21, and cause the weld to warp or bulge after welding. Therefore, in this embodiment, θ1>θ2 and D2>D1 are set to ensure that the sealing pin 30 can be placed in the groove 21, and can be supported by the groove wall of the groove 21, and the placement position of the sealing pin 30 can be adjusted within the groove wall of the groove 21 to achieve a good welding effect.

[0030] Please refer to Figures 3 and 4. In one embodiment of the present application, in order to improve the matching effect between the sealing pin 30 and the groove 21, the groove wall of the groove 21 of this embodiment includes a first section 23 and a second section 24 connected to each other, the second section 24 is away from the first plane 22, and the angle between the second section 24 and the first plane 22 is

[0031] θ4, θ2>θ4, that is, the angle between the first section surface 23 and the first plane 22 is larger, and the angle between the second section surface 24 and the first plane 22 is smaller; the side wall of the sealing nail 30 includes a first surface 32 and a second surface 33, the first surface 32 corresponds to the first section surface 23, the second surface 33 corresponds to the second section surface 24, and the angle between the second surface 33 and the second plane 31 is θ3, θ3>θ1, that is, the angle between the first surface 32 and the second plane 31 is larger, and the angle between the second surface 24 and the second plane 31 is smaller, and θ4≥θ3, that is, in this embodiment The groove wall of the groove 21 is configured to include two sections, and correspondingly, the side wall of the sealing pin 30 also includes two parts. In this way, when the sealing pin 30 is placed in the groove 21, the sealing pin 30 can be supported by the groove wall of the groove 21 to ensure the cooperation between the sealing pin 30 and the groove wall of the groove 21. The gap between the sealing pin 30 and the groove wall of the groove 21 can be adjusted to reduce the assembly gap between the two and avoid poor welding. At the same time, the sealing pin 30 and the groove 21 are configured to be inclined in two sections, which saves the material of the sealing pin 30 and reduces the volume of the sealing pin 30.

[0032] Specifically, in this embodiment, θ4>θ3 is set to avoid the situation where the sealing pin 30 produced does not meet the standard of θ4=θ3 due to production errors when θ4=θ3. For example, it may cause θ4<θ3, in which case the sealing pin 30 cannot be placed in the groove 21.

[0033] In one embodiment, in order to facilitate the adjustment of the position of the sealing pin 30 in the groove 21, an arc transition surface 34 is provided between the first surface 32 and the second surface 33. It can be understood that the arc transition surface 34 is also the position in contact with the groove wall of the groove 21, so that when the sealing pin 30 is adjusted in the groove 21, the arc transition surface 34 facilitates the movement of the position of the sealing pin 30 in the groove 21 to adjust the position of the sealing pin 30 in the groove 21. At the same time, when adjusting the placement position of the sealing pin 30, it moves in the groove 21 in a sliding manner, reducing the friction between the groove wall of the groove 21 and avoiding scratches on the groove 21 caused by sharp transitions.

[0034] Please refer to Figures 4 and 5. In one embodiment of the present application, the height H1 of the sealing pin 30 ranges from 3 mm to 30 mm, and the height H2 of the groove 21 ranges from 3 mm to 30 mm. In a specific embodiment of the present application, the height H1 of the sealing pin 30 is less than the height H2 of the groove 21, so that after the sealing pin 30 is placed in the groove 21, the sealing pin 30 does not contact the bottom of the groove 21.

[0035] Among them, the matching welding position of the sealing pin 30 and the groove 21 in this embodiment is the outer ring surface of the sealing pin 30 and the top end of the groove 21. The laser source acts on the sealing pin 30 and the pole 20, and the sealing pin 30 and the pole 20 melt. After cooling and solidification, the sealing pin 30 and the pole 20 are connected into one.

[0036] 1 and 2 , an embodiment of the present application further provides a battery 200 , specifically, a cylindrical battery 200 , including a shell 40 , a winding core 50 , and a cover plate structure 100 provided in an embodiment of the present application.

[0037] The shell 40 forms a receiving space for receiving the winding core 50 , and the winding core 50 is disposed in the shell 40 ; the cover plate structure 100 is configured to cover the shell 40 , thus forming a cylindrical battery 200 after assembly.

[0038] Specifically, the outer diameter D3 of the shell 40 in this embodiment ranges from 20 mm to 80 mm, and the total height H3 of the shell 40 and the cover plate 10 ranges from 80 mm to 160 mm, so that different sizes of the shell 40 and the height of the entire battery 200 can be selected according to different models of the battery 200.

[0039] An embodiment of the present application also provides a battery pack, comprising the battery provided in an embodiment of the present application.

Claims

1. Cover plate structure, including: Cover plate; A pole connected to the cover plate, wherein a groove is provided on the pole, wherein the plane where the upper surface of the pole is located is a first plane, wherein the groove wall of the groove includes at least a first section surface, wherein the first section surface is connected to the first plane, and wherein the angle between the first section surface and the first plane is θ2; A sealing nail is arranged in the groove and is welded to the pole, the plane where the upper surface of the sealing nail is located is the second plane, the side wall of the sealing nail includes at least a first surface, the first surface is connected to the second plane, and the angle between the first surface and the second plane is θ1; Among them, θ1≥θ2.

2. The cover plate structure according to claim 1, wherein: The groove wall of the groove includes the first section surface and the second section surface connected to each other, the second section surface is far away from the first plane, and the angle between the plane where the second section surface is located and the first plane is θ4, θ2>θ4; The side wall of the sealing pin includes the first surface and the second surface, the first surface corresponds to the first section surface, the second surface corresponds to the second section surface, the angle between the plane where the second surface is located and the second plane is θ3, θ1>θ3, and θ4≥θ3.

3. The cover plate structure according to claim 2, wherein: An arc transition surface is formed between the first surface and the second surface.

4. The cover plate structure according to claim 2, wherein: θ4>θ3.

5. The cover plate structure according to any one of claims 1 to 4, wherein: The outer diameter D1 of the sealing pin is in the range of 3 mm to 20 mm, the diameter D2 of the groove is in the range of 3 mm to 30 mm, and D2 ≥ D1.

6. The cover structure according to claim 5, wherein: θ1>θ2, D2>D1.

7. The cover plate structure according to any one of claims 1 to 4, wherein: The height H1 of the sealing pin is in the range of 3 mm to 30 mm, and the height H2 of the groove is in the range of 3 mm to 30 mm.

8. Batteries, including: case; A winding core is disposed in the shell; The cover plate structure according to any one of claims 1 to 7, wherein the cover plate structure is configured to cover the shell.

9. The battery according to claim 8, wherein The outer diameter D3 of the shell is in the range of 20 mm to 80 mm, and the total height H3 of the shell and the cover plate is in the range of 80 mm to 160 mm.

10. A battery pack comprising the battery according to claim 8 or 9.

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