Sealing ring, cover plate assembly and battery

Abstract

The invention relates to the technical field of batteries, and discloses a sealing ring, a cover plate assembly and a battery, the sealing ring comprises a main body, the main body is provided with a first end face and a second end face which are oppositely arranged along a first direction, the main body is provided with a mounting hole, and the main body surrounds the mounting hole to form a hole inner wall, the mounting hole extends along a first direction and penetrates through the first end surface and the second end surface; the end, close to the second end face, of the inner wall of the hole is expanded outwards, so that a chamfer structure is formed. According to the invention, the chamfer structure is formed at one end of the inner wall of the sealing ring mounting hole, and when the sealing ring is sleeved into the pole, the chamfer structure is utilized to realize guiding, so that the sealing ring can be conveniently assembled with the pole, the sealing ring is prevented from skewing, and the sealing performance of the battery is further ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a sealing ring, a cover plate assembly and a battery. Background Art

[0002] The battery cover is provided with a pole hole, and the pole is inserted into the pole hole and fixed to the battery cover. During the installation of the pole, in order to prevent the battery from leaking at the pole hole, the pole installation location needs to be sealed. In the prior art, a sealing ring is usually sleeved on the outer periphery of the pole. After the battery cover, pole and sealing ring are assembled, the sealing ring is squeezed and set between the battery cover and pole to achieve sealing at the pole hole. However, when the sealing ring is assembled with the pole, the sealing ring is not easy to fit into the pole, which can easily cause the sealing ring to become skewed during installation, thereby affecting the sealing performance of the battery. Summary of the Invention

[0003] In view of this, the present invention provides a sealing ring, a cover plate assembly and a battery to solve the problem in the prior art that the sealing ring is difficult to insert into the pole, which easily causes the sealing ring to tilt during installation, thereby affecting the sealing performance of the battery.

[0004] In a first aspect, the present invention provides a sealing ring, comprising: a main body, the main body having a first end face and a second end face arranged opposite to each other along a first direction, the main body being provided with a mounting hole, and the main body being arranged to surround the mounting hole to form an inner wall of the hole, the mounting hole extending along the first direction and passing through the first end face and the second end face; wherein the inner wall of the hole is expanded outward at an end close to the second end face to form a chamfered structure.

[0005] Beneficial effect: By forming a chamfered structure at one end of the inner wall of the sealing ring mounting hole, the chamfered structure is used to guide the sealing ring when it is inserted into the pole, which can facilitate assembly with the pole and avoid the sealing ring from being skewed, thereby ensuring the sealing performance of the battery.

[0006] In an optional embodiment, in a cross section of the main body along the first direction, an angle α between the chamfered structure and an extension surface of the second end surface toward the mounting hole satisfies 30°≤α≤70°.

[0007] Beneficial effect: By limiting the inclination angle of the chamfered structure, the chamfered structure has an appropriate inclination degree, which facilitates the sealing ring to be inserted into the pole, avoids the sealing ring from being skewed, and thus ensures the sealing performance of the battery.

[0008] In an optional embodiment, the main body includes a main ring layer and at least one stepped ring layer, and the main ring layer and the stepped ring layer are connected in sequence along a first direction. The side of the main ring layer away from the stepped ring layer forms the first end face, and the outer diameter of the stepped ring layer is larger than the outer diameter of the main ring layer, so that the outer peripheral wall of the main body forms a stepped structure.

[0009] Beneficial effect: The outer peripheral wall of the main body forms a stepped structure, which facilitates the extrusion and fit of the sealing ring and the multiple structures of the cover assembly, thereby simplifying the assembly process of the cover assembly and ensuring the sealing effect of the battery.

[0010] In an optional embodiment, along the first direction, the height of the chamfered structure is f, the total height of the stepped ring layer is e, and e / 5≤f≤3e / 4 is satisfied.

[0011] Beneficial effect: While ensuring the structural strength of the sealing ring, the sealing effect of the battery is also guaranteed.

[0012] In an optional embodiment, along the first direction, the total height of the stepped ring layer is e, which satisfies 0.7 mm ≤ e ≤ 3 mm.

[0013] Beneficial effect: The sealing ring is easily installed between the cover body and the pole, while ensuring the sealing effect of the battery.

[0014] In an optional embodiment, along the first direction, the height of the chamfered structure is f, satisfying 0.3 mm ≤ f ≤ 2.25 mm.

[0015] In an optional embodiment, on a cross section of the main body along the first direction, along a direction perpendicular to the first direction, the width of the chamfered structure is g, satisfying 0.2 mm ≤ g ≤ 3.9 mm.

[0016] Beneficial effect: While ensuring the structural strength of the sealing ring, the sealing effect of the battery is also guaranteed.

[0017] In the second aspect, the present invention also provides a cover assembly, comprising: a cover body, which is provided with a pole hole; a pole, comprising a column, which is inserted into the pole hole; the above-mentioned sealing ring, which is sleeved on the outer peripheral wall of the column and compressed between the column and the cover body.

[0018] In an optional embodiment, the column has a first cross-section perpendicular to the first direction, and the first cross-section includes two arc segments and two straight line segments, the two straight line segments are relatively spaced apart along the width direction of the cover body, and the two arc segments are relatively spaced apart along the length direction of the cover body, and the two arc segments are respectively connected to the two ends of the two straight line segments on the same side.

[0019] In a third aspect, the present invention further provides a battery, comprising: a shell having an opening at at least one end; and the above-mentioned cover plate assembly, wherein the cover plate assembly is connected to the shell and blocks the opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic structural diagram of a sealing ring according to an embodiment of the present invention;

[0022] Figure 2 for Figure 1 A schematic cross-sectional view of the sealing ring along a first direction is shown;

[0023] Figure 3 is a schematic cross-sectional view along a first direction of another sealing ring according to an embodiment of the present invention;

[0024] Figure 4 for Figure 2 A schematic diagram of a portion of the structure of the sealing ring shown;

[0025] Figure 5 This is a structural diagram of a cover plate assembly according to an embodiment of the present invention;

[0026] Figure 6 for Figure 5 The exploded structural diagram of the cover assembly shown;

[0027] Figure 7 Schematic diagram of a first cross section of a pole according to an embodiment of the present invention.

[0028] Description of reference numerals:

[0029] 1. Main body; 11. First end face; 12. Second end face; 13. Mounting hole; 14. Inner wall of hole; 141. Chamfered structure; 15. Main ring layer; 16. Stepped ring layer; 161. First ring layer; 162. Second ring layer; 2. Cover plate body; 21. Pole hole; 3. Pole; 31. First cross section; 311. Arc segment; 312. Straight line segment; 32. Column; 33. Plate body. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0031] The following combination Figures 1 to 7 , describing embodiments of the present invention.

[0032] According to an embodiment of the present invention, on the one hand, a sealing ring is provided, such as Figures 1 to 4 As shown, it includes: a main body 1, the main body 1 has a first end face 11 and a second end face 12 arranged opposite to each other along a first direction, the main body 1 is provided with a mounting hole 13, and the main body 1 forms a hole inner wall 14 around the mounting hole 13, the mounting hole 13 extends along the first direction and passes through the first end face 11 and the second end face 12; wherein, the hole inner wall 14 is expanded outward at one end close to the second end face 12 to form a chamfered structure 141.

[0033] When the sealing ring of this embodiment is used, a chamfered structure 141 is formed on one end of the inner wall 14 of the sealing ring mounting hole 13. When the sealing ring is inserted into the terminal 3, the chamfered structure 141 is used for guidance, which can facilitate assembly with the terminal 3 and prevent the sealing ring from being skewed, thereby ensuring the sealing performance of the battery.

[0034] It is worth noting that, in this embodiment, Figure 1 As shown, the first direction is the axial direction of the main body 1 and the mounting hole 13. For the cover assembly, the first direction is the thickness direction of the cover assembly.

[0035] It should be noted that when the sealing ring is inserted into the terminal 3, the end of the sealing ring having the second end surface 12 is first aligned with the terminal 3. That is, the terminal 3 is inserted into the mounting hole 13 from the end of the mounting hole 13 that is closer to the second end surface 12. Therefore, in this embodiment, the chamfered structure 141 guides the terminal 3 when it is inserted into the mounting hole 13, making it easier to insert the terminal 3 into the mounting hole 13 and improving the fit between the terminal 3 and the sealing ring, thereby ensuring the installation of the sealing ring and, in turn, the sealing performance of the battery.

[0036] In one embodiment, Figure 4As shown, in a cross section of the main body 1 along the first direction, the angle α between the chamfered structure 141 and the extension of the second end face 12 toward the mounting hole 13 satisfies 30°≤α≤70°. By limiting the inclination angle of the chamfered structure 141, the chamfered structure 141 has an appropriate degree of inclination, facilitating the insertion of the sealing ring into the terminal 3 and preventing the sealing ring from tilting, thereby ensuring the sealing performance of the battery.

[0037] It is worth noting that if the value of α is too large, the inclination of the chamfered structure 141 relative to the first direction is too small, which is still inconvenient for the sealing ring to be inserted, so the sealing ring may still be skewed, resulting in the sealing performance of the battery being affected; if the value of α is too small, the chamfered structure 141 is too smooth, resulting in the guiding effect of the chamfered structure 141 being unclear, so the sealing ring may easily be skewed, affecting the sealing performance of the battery.

[0038] Optionally, the value of α is any value of 30°, 32°, 35°, 38°, 40°, 42°, 45°, 48°, 50°, 52°, 55°, 58°, 60°, 62°, 65°, 68°, 70°, or a value between any two values.

[0039] In one embodiment, Figures 1 to 4 As shown, the main body 1 includes a main ring layer 15 and at least one stepped ring layer 16. The main ring layer 15 and the stepped ring layer 16 are sequentially connected along a first direction. The side of the main ring layer 15 away from the stepped ring layer 16 forms a first end face 11. The outer diameter of the stepped ring layer 16 is larger than that of the main ring layer 15, so that the outer peripheral wall of the main body 1 forms a stepped structure. This arrangement forms a stepped structure on the outer peripheral wall of the main body 1, facilitating the extrusion fit of the sealing ring with the multiple structures of the cover plate assembly, simplifying the assembly process of the cover plate assembly while ensuring the sealing effect of the battery.

[0040] It is worth noting that the stepped ring layer 16 can be provided with a (see Figure 3 ), or two can be set (see Figure 2 ), of course, it can also be set to more, such as three, four, etc.

[0041] For example, see Figure 3 When the stepped ring layer 16 is provided with one, the main ring layer 15 and the stepped ring layer 16 are connected along the first direction, the side of the main ring layer 15 away from the stepped ring layer 16 forms a first end face 11, and the side of the stepped ring layer 16 away from the main ring layer 15 forms a second end face 12.

[0042] For example, see Figure 2When there are two stepped ring layers 16, the two stepped ring layers 16 are the first ring layer 161 and the second ring layer 162, the main ring layer 15, the first ring layer 161 and the second ring layer 162 are connected in sequence along the first direction, that is, the first ring layer 161 is connected between the main ring layer 15 and the second ring layer 162, and the side of the main ring layer 15 away from the first ring layer 161 forms a first end face 11, and the side of the second ring layer 162 away from the first ring layer 161 forms a second end face 12.

[0043] In one embodiment, Figure 4 As shown, along the first direction, the height of the chamfered structure 141 is f, and the total height of the stepped ring layer 16 is e, satisfying e / 5≤f≤3e / 4. In other words, the height f of the chamfered structure 141 ranges from 0.2e to 0.75e. This arrangement ensures the structural strength of the sealing ring while also ensuring the sealing effect of the battery.

[0044] It is worth noting that if the value of f is too large, the opening range of the chamfer structure 141 is too large, and the structural strength of the main body 1 is weakened too much, resulting in weak structural strength of the sealing ring and poor reliability of the sealing ring, which is easy to affect the sealing effect of the battery; if the value of f is too small, the guiding effect of the chamfer structure 141 is not obvious, so the sealing ring is prone to skewness, affecting the sealing performance of the battery.

[0045] Optionally, the value range of f is any value among 0.2e, 0.25e, 0.3e, 0.35e, 0.4e, 0.45e, 0.5e, 0.55e, 0.6e, 0.65e, 0.7e, and 0.75e, or a value between any two values.

[0046] It should be noted that when there is one stepped ring layer 16, the total height e of the stepped ring layer 16 is the height of one stepped ring layer 16. When there are two stepped ring layers 16, the total height e of the stepped ring layer 16 is the sum of the heights of the two stepped ring layers 16 (see Figure 4 ).

[0047] Specifically, in one embodiment, Figure 4 As shown, along the first direction, the total height of the stepped ring layer 16 is e, which satisfies 0.7mm≤e≤3mm. This arrangement facilitates the installation of the sealing ring between the cover body 2 and the terminal 3 while ensuring the sealing effect of the battery.

[0048] It is worth noting that if the value of e is too large, the space occupied by the stepped ring layer 16 is too large, which is inconvenient to install between the cover body 2 and the pole 3, and will cause the overall space occupied by the cover assembly to be too large, affecting the energy density of the battery; if the value of e is too small, the height of the stepped ring layer 16 is too small, and the sealing effect between the cover body 2 and the pole 3 is poor, affecting the sealing effect of the battery.

[0049] Optionally, the value of e is any value among 0.7mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, or a value between any two values.

[0050] Specifically, in one embodiment, Figure 4 As shown, along the first direction, the height of the chamfered structure 141 is f, which satisfies 0.3 mm ≤ f ≤ 2.25 mm.

[0051] Optionally, the value of f is any value among 0.3mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.1mm, 2.25mm, or a value between any two values.

[0052] In one embodiment, Figure 4 As shown, in a cross section of the main body 1 along the first direction, the width of the chamfered structure 141 along the direction perpendicular to the first direction is g, which satisfies 0.2mm≤g≤3.9mm. This arrangement ensures the structural strength of the sealing ring while ensuring the sealing effect of the battery.

[0053] It is worth noting that if the value of g is too large, the opening range of the chamfer structure 141 is too large, and the structural strength of the main body 1 is weakened too much, resulting in weak structural strength of the sealing ring and poor reliability of the sealing ring, which is easy to affect the sealing effect of the battery; if the value of g is too small, the guiding effect of the chamfer structure 141 is not obvious, so the sealing ring is prone to skewness, affecting the sealing performance of the battery.

[0054] Optionally, the value of g is any value among 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.9mm, or a value between any two values.

[0055] The following observations are made on the assembly of sealing rings of different sizes. The assembly results of the embodiment sealing ring and the comparative sealing ring are shown in Table 1, wherein the embodiment sealing ring refers to a sealing ring that meets the requirements of this embodiment, and correspondingly, the comparative sealing ring refers to a sealing ring that does not meet the requirements of this embodiment.

[0056] Table 1 Assembly of the sealing rings of the embodiment and the comparative example

[0057]

[0058]

[0059] As can be seen from Table 1, in Examples 1 to 10, the value of α satisfies 30°≤α≤70°, the value of e satisfies 0.7mm≤e≤3mm, and the value of f satisfies e / 5≤f≤3e / 4. Therefore, the chamfered structure 141 has a suitable angle to facilitate the sealing ring to be inserted into the pole 3 and avoid the sealing ring from being skewed; and the chamfered structure 141 has a suitable height to ensure the structural strength of the sealing ring, and the sealing ring has no weak points.

[0060] It can be seen from Table 1 that in Comparative Examples 1 and 2, the value of α is less than 30°, the value of the chamfer structure 141 is too small, and the sealing ring is easily skewed during the insertion process.

[0061] It can be seen from Table 1 that in Comparative Examples 3 and 4, the value of α is greater than 70°, and the value of the chamfer structure 141 is too large, which makes it difficult to insert the sealing ring and the sealing ring is easily skewed.

[0062] It can be seen from Table 1 that in Comparative Examples 5 and 6, the value of f is less than e / 5, the height of the chamfered structure 141 is too small, and the sealing ring is easily skewed.

[0063] It can be seen from Table 1 that in Comparative Examples 7 and 8, the value of f is greater than 3e / 4, the height of the chamfered structure 141 is too large, the structural strength of the sealing ring is weak, and the sealing ring has a weak point.

[0064] It is worth noting that the width g of the chamfered structure 141 , the height f of the chamfered structure 141 , and the angle α between the chamfered structure 141 and the extension surface of the second end surface 12 toward the mounting hole 13 satisfy g=f / tan(α).

[0065] According to an embodiment of the present invention, on the other hand, a cover plate assembly is provided. Figure 5 and Figure 6 As shown, the battery comprises: a cover plate body 2 having a terminal hole 21; a terminal 3 including a column 32 inserted into the terminal hole 21; and the aforementioned sealing ring, which is sleeved around the outer wall of the column 32 and compressed between the column 32 and the cover plate body 2. Thus, the sealing ring is used to seal between the cover plate body 2 and the terminal 3, ensuring the sealing effect of the cover plate assembly and, in turn, the sealing effect of the battery.

[0066] In one embodiment, Figure 7As shown, the column 32 has a first cross-section 31 perpendicular to the first direction. The first cross-section 31 includes two arc segments 311 and two straight segments 312. The two straight segments 312 are spaced apart from each other along the width of the cover body 2, and the two arc segments 311 are spaced apart from each other along the length of the cover body 2. The two arc segments 311 are connected to the ends of the two straight segments 312 on the same side. In other words, the first cross-section 31 is an oblong (or racetrack-shaped) shape.

[0067] It is worth noting that the cover assembly of this embodiment is applied to blade batteries. The cover body 2 of the blade battery has a large aspect ratio, that is, the length of the cover body 2 is large and the width is small. At present, the industry has increasingly higher requirements for the charge and discharge rates of batteries, which requires the current capacity of the pole 3 to be increased, that is, the cross-sectional area of ​​the pole 3 perpendicular to the first direction needs to be increased. In the prior art, the cross-section of the pole 3 perpendicular to the first direction is usually circular. Since the width of the cover body 2 of the blade battery is small, it is not convenient to increase the diameter of the circle. Therefore, two cylindrical poles 3 are usually provided in the prior art to increase the current capacity. Such a setting results in a complicated assembly process of the cover assembly and low assembly efficiency. In this embodiment, the size of the pole 3 along the length direction of the cover body 2 is increased, which can not only improve the current capacity of the pole 3, but also does not need to increase the number of poles 3, thereby ensuring assembly efficiency.

[0068] It should be further explained that the shape of the sealing ring is adapted to the shape of the column 32 , that is, the cross section of the sealing ring perpendicular to the first direction is also an oblong.

[0069] In this embodiment, if Figure 6 As shown, the pole 3 further includes a plate 33 , which is connected to one end of the column 32 , and the second end surface 12 is in contact with a surface of the plate 33 facing the column 32 .

[0070] According to an embodiment of the present invention, in another aspect, a battery is provided, comprising: a shell having an opening at at least one end; and the above-mentioned cover plate assembly, wherein the cover plate assembly is connected to the shell and blocks the opening.

[0071] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A sealing ring, characterized in that: include: a main body having a first end face and a second end face arranged opposite to each other along a first direction, a mounting hole being formed in the main body, and the main body surrounding the mounting hole to form an inner wall of the hole, the mounting hole extending along the first direction and penetrating the first end face and the second end face; Wherein, the inner wall of the hole is expanded outward at one end close to the second end surface to form a chamfered structure.

2. The sealing ring according to claim 1, characterized in that: In a cross section of the main body along the first direction, an angle α between the chamfered structure and an extension surface of the second end surface toward the mounting hole satisfies 30°≤α≤70°.

3. The sealing ring according to claim 1 or 2, characterized in that: The main body includes a main ring layer and at least one stepped ring layer, and the main ring layer and the stepped ring layer are connected in sequence along a first direction. The side of the main ring layer away from the stepped ring layer forms the first end face, and the outer diameter of the stepped ring layer is larger than the outer diameter of the main ring layer, so that the outer peripheral wall of the main body forms a stepped structure.

4. The sealing ring according to claim 3, characterized in that: Along the first direction, the height of the chamfered structure is f, and the total height of the stepped ring layer is e, satisfying e / 5≤f≤3e / 4.

5. The sealing ring according to claim 4, characterized in that: Along the first direction, the total height of the stepped ring layer is e, which satisfies 0.7 mm ≤ e ≤ 3 mm.

6. The sealing ring according to claim 4, characterized in that: Along the first direction, the height of the chamfered structure is f, satisfying 0.3 mm ≤ f ≤ 2.25 mm.

7. The sealing ring according to claim 1 or 2, characterized in that: On a cross section of the main body along the first direction, along a direction perpendicular to the first direction, a width of the chamfered structure is g, which satisfies 0.2 mm ≤ g ≤ 3.9 mm.

8. A cover plate assembly, characterized in that: include: The cover body is provided with a pole hole; A pole, comprising a column, wherein the column is inserted into the pole hole; The sealing ring according to any one of claims 1 to 7 is sleeved on the outer peripheral wall of the column and compressed between the column and the cover plate body.

9. The cover plate assembly according to claim 8, wherein: The column has a first cross-section perpendicular to the first direction, and the first cross-section includes two arc segments and two straight line segments. The two straight line segments are relatively spaced apart along the width direction of the cover body, and the two arc segments are relatively spaced apart along the length direction of the cover body. The two arc segments are respectively connected to the two ends of the two straight line segments on the same side.

10. A battery, characterized in that: include: a housing having an opening at at least one end; The cover plate assembly according to claim 9 is connected to the shell and blocks the opening.

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