Top cover structure, battery shell and battery

Abstract

The embodiment of the invention discloses a top cover structure, a battery shell and a battery, and relates to the technical field of batteries. The top cover structure comprises a top cover, a cover cap and a sealing piece, the top cover is provided with a liquid injection hole, the top cover is provided with an annular part surrounding the liquid injection hole, the annular part and the liquid injection hole are coaxially arranged, the hole wall of the liquid injection hole extends to the annular part in the axial direction of the liquid injection hole, the sealing piece is arranged in the liquid injection hole, and the cover cap is connected with the top cover and used for pressing the sealing piece into the liquid injection hole. Due to the fact that the annular part is designed, the area of the hole wall of the liquid injection hole can be increased, the contact area of the sealing piece and the hole wall is increased, the cap can prevent the sealing piece from falling off from the hole wall, sealing is firmer, and the sealing effect of the liquid injection hole is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a top cover structure, a battery shell and a battery. Background Art

[0002] The existing top cover injection hole is directly punched, and the top cover has a high material structure strength, so the required thickness is thinner. After the injection hole is filled, it needs to be sealed. The existing sealing method is mostly rubber plugs. Due to the thin thickness of the top cover, there is a defect that the contact surface between the rubber plug and the top cover is small, making the sealing unreliable. Summary of the invention

[0003] Based on this, it is necessary to provide a top cover structure, a battery housing and a battery, aiming to solve the technical problem that the existing top cover injection hole is directly punched, and the top cover has a high material structure strength and requires a thinner thickness. The injection hole needs to be sealed after the injection is completed. The existing sealing method is mostly a rubber plug. Due to the thin thickness of the top cover, there is a defect that the contact surface between the rubber plug and the top cover is small, making the sealing unreliable.

[0004] In a first aspect, the present invention provides a top cover structure, comprising: a top cover, a cover cap and a sealing member, wherein the top cover has an injection hole, the top cover is provided with an annular portion surrounding the injection hole, the annular portion is coaxially arranged with the injection hole, the hole wall of the injection hole extends to the annular portion along the axial direction of the injection hole, the sealing member is arranged in the injection hole, the cover cap is connected to the top cover, and is used to press the sealing member into the injection hole so that the sealing member and the hole wall have an interference fit.

[0005] In one embodiment, the top cover is provided with a positioning hole, and the injection hole is located at the bottom of the positioning hole;

[0006] The cap includes a mounting portion, a positioning portion and a fixing portion, the mounting portion is connected to the fixing portion through the positioning portion, the positioning portion is received in the positioning hole, the mounting portion is connected to the top cover, and the fixing portion is elastically abutted against the sealing member.

[0007] In one embodiment, the positioning portion is disposed around the circumferential outer side of the fixing portion and protrudes from the mounting portion and the fixing portion toward the positioning hole to form an annular groove disposed around the fixing portion on a side of the positioning portion away from the positioning hole.

[0008] In one embodiment, the plane where the fixing portion is located is flush with the plane where the mounting portion is located, or the fixing portion is at least partially located in the positioning hole.

[0009] In one embodiment, the annular portion is located on a side of the top cover away from the positioning hole, and one end of the annular portion away from the top cover is inclined toward a side away from the injection hole to form a flange structure, and a clamping groove is formed between the flange structure and the top cover;

[0010] The top cover structure also includes a lower plastic, and the lower plastic portion is connected to the clamping groove.

[0011] In one embodiment, the lower plastic includes a main body, and a clamping portion and an abutting portion connected to the main body, the main body is connected to the top cover, the clamping portion is clamped in the clamping groove, and the abutting portion abuts against the sealing member;

[0012] A liquid injection groove is provided around the abutting portion where the abutting portion abuts against the sealing member, and the liquid injection groove is used for injecting liquid.

[0013] In one embodiment, the sealing member includes a body and an annular protrusion, the body and the annular protrusion are coaxially arranged, and the annular protrusion is arranged in the middle of the body and abuts against the hole wall.

[0014] In one embodiment, the diameter of the body gradually decreases from the middle portion to the two ends.

[0015] In a second aspect, the present invention further provides a battery casing, which includes a shell assembly and a top cover structure of any of the above embodiments, wherein the top cover and the shell assembly are arranged to form a closed space, and the closed space is used to install battery cells.

[0016] In a third aspect, the present invention further provides a battery, comprising a battery cell and the battery casing of the above embodiment, wherein the battery cell is installed in the enclosed space.

[0017] Implementing the embodiments of the present invention will have the following beneficial effects:

[0018] The top cover structure, battery shell and battery of the present invention are adopted. The top cover of the top cover structure has a liquid injection hole. The top cover is provided with an annular portion surrounding the liquid injection hole. The annular portion is coaxially arranged with the liquid injection hole. The hole wall of the liquid injection hole extends to the annular portion along the axial direction of the liquid injection hole. The sealing member is arranged in the liquid injection hole. The cap is connected to the top cover and is used to press the sealing member into the liquid injection hole so that the sealing member and the hole wall have an interference fit. Due to the design of the annular portion, the hole wall area of ​​the liquid injection hole can be increased, so that the contact area between the sealing member and the hole wall is increased, and the cap can prevent the sealing member from falling off from the hole wall, so that the seal is more reliable, thereby improving the sealing effect of the liquid injection hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] in:

[0021] Figure 1 2 is a cross-sectional view of a top cover structure in one embodiment.

[0022] Figure 2 for Figure 1 Schematic diagram of the top cover and cover cap in the top cover structure shown.

[0023] Figure 3 for Figure 1 Schematic diagram of the seal in the top cover structure shown.

[0024] Reference numerals:

[0025] 1. Top cover; 11. Liquid injection hole; 12. Ring-shaped portion; 13. Positioning hole; 14. Flanging structure; 141. Snap-in groove;

[0026] 2. Cover cap; 21. Mounting portion; 22. Positioning portion; 221. Annular groove; 23. Fixing portion;

[0027] 3. sealing member; 31. body; 32. annular protrusion;

[0028] 4. lower plastic; 41. main body; 42. clamping part; 43. abutting part. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0033] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0034] Please combine Figures 1 to 3 Now, the top cover 1 structure provided by the present invention is described. The top cover 1 structure is used in the battery shell of the battery.

[0035] The top cover 1 structure includes: a top cover 1, a cap 2 and a sealing member 3. The top cover 1 has a liquid injection hole 11. The top cover 1 is provided with an annular portion 12 surrounding the liquid injection hole 11. The annular portion 12 is coaxially arranged with the liquid injection hole 11. The hole wall of the liquid injection hole 11 extends to the annular portion 12 along the axial direction of the liquid injection hole 11. The sealing member 3 is arranged in the liquid injection hole 11. The cap 2 is connected to the top cover 1 and is used to press the sealing member 3 into the liquid injection hole 11 so that the sealing member 3 and the hole wall have an interference fit. Specifically, the sealing member 3 is a structural member made of elastic material.

[0036] It can be understood that the top cover 1 of the top cover 1 structure has an injection hole 11, and the top cover 1 is provided with an annular portion 12 surrounding the injection hole 11, the annular portion 12 is coaxially arranged with the injection hole 11, and the hole wall of the injection hole 11 extends to the annular portion 12 along the axial direction of the injection hole 11, the sealing member 3 is arranged in the injection hole 11, and the cap 2 is connected to the top cover 1, and is used to press the sealing member 3 into the injection hole 11 so that the sealing member 3 and the hole wall have an interference fit. Due to the design of the annular portion 12, the hole wall area of ​​the injection hole 11 can be increased, so that the contact area between the sealing member 3 and the hole wall is increased, and the cap 2 can prevent the sealing member 3 from falling off from the hole wall, so that the seal is more reliable, thereby improving the sealing effect of the injection hole 11.

[0037] In this embodiment, the top cover 1 is provided with a positioning hole 13 , and the injection hole 11 is located at the bottom of the positioning hole 13 .

[0038] The cap 2 includes a mounting portion 21, a positioning portion 22 and a fixing portion 23. The mounting portion 21 is connected to the fixing portion 23 via the positioning portion 22. The positioning portion 22 is received in the positioning hole 13. The mounting portion 21 is connected to the top cover 1, and the fixing portion 23 is elastically abutted against the sealing member 3. Specifically, the mounting portion 21, the positioning portion 22 and the fixing portion 23 are integrally formed. The positioning portion 22 can be positioned through the positioning hole 13, so that the fixing portion 23 can elastically abut against the sealing member 3, thereby preventing the sealing member 3 from falling off from the injection hole 11. The mounting portion 21 is welded to the top cover 1, so that the mounting portion 21 can be fixed to the top cover 1, thereby further strengthening the sealing of the injection hole 11.

[0039] Furthermore, the positioning portion 22 is disposed around the outer side of the fixing portion 23 in the circumferential direction, and protrudes from the mounting portion 21 and the fixing portion 23 toward the positioning hole 13, so as to form an annular groove 221 disposed around the fixing portion 23 on the side of the positioning portion 22 away from the positioning hole 13. In this way, the positioning portion 22 forms a convex rib, which can cooperate with the positioning hole 13 to realize the positioning function. In addition, the above-mentioned arrangement of the positioning portion 22 can also improve the structural strength of the cap 2 and the abutment force on the sealing member 3, so that the sealing member 3 can be relatively stably arranged on the injection hole 11.

[0040] Furthermore, the plane where the fixing portion 23 is located is flush with the plane where the mounting portion 21 is located. Before the cap 2 is installed, the plane where the fixing portion 23 is located is lower than the plane where the mounting portion 21 is located. After the fixing portion 23 elastically abuts against the seal 3, the fixing portion 23 is abutted against by the seal 3 and deformed outward, so that the fixing portion 23 and the mounting portion 21 form a plane and do not protrude from the mounting portion 21, thereby optimizing the appearance.

[0041] Of course, in other embodiments, the fixing portion 23 is at least partially located in the positioning hole 13. Thus, after the fixing portion 23 elastically abuts against the sealing member 3, the fixing portion 23 is abutted against by the sealing member 3 and deformed outward, so that the fixing portion 23 does not protrude from the mounting portion 21, thereby optimizing the appearance.

[0042] In one embodiment, if Figure 1 and Figure 2 As shown, the annular portion 12 is located on the side of the top cover 1 away from the positioning hole 13, and the end of the annular portion 12 away from the top cover 1 is inclined toward the side away from the injection hole 11 to form a flange structure 14, and a clamping groove 141 is formed between the flange structure 14 and the top cover 1. In this way, by providing the flange structure 14, the strength of the injection hole 11 can be increased, and the burrs formed by the injection hole 11 can be removed.

[0043] The top cover 1 structure further includes a lower plastic 4, and a portion of the lower plastic 4 is connected to the clamping groove 141. In this way, the lower plastic 4 can be fixed on the side of the top cover 1 away from the positioning hole 13.

[0044] In this embodiment, the lower plastic 4 includes a main body 41, and a clamping portion 42 and an abutting portion 43 connected to the main body 41. The main body 41 is connected to the top cover 1, the clamping portion 42 is clamped in the clamping groove 141, and the abutting portion 43 abuts against the sealing member 3. Specifically, the main body 41, the clamping portion 42 and the abutting portion 43 can be integrally formed. The clamping portion 42 is clamped in the clamping groove 141, so that the main body 41 can be connected to the side of the top cover 1 away from the positioning hole 13, and the abutting portion 43 can abut against the sealing member 3, and cooperate with the fixing portion 23 to elastically abut the sealing member 3, thereby positioning the sealing member 3, so that the sealing member 3 can firmly seal the injection hole 11.

[0045] Furthermore, a liquid injection groove is provided around the abutting portion 43 abutting the sealing member 3, and the liquid injection groove is used for injecting liquid. The electrolyte injected into the liquid injection hole 11 flows into the side of the top cover 1 away from the positioning hole 13 through the liquid injection groove.

[0046] In one embodiment, if Figure 1 and Figure 3 As shown, the seal 3 includes a body 31 and an annular protrusion 32, the body 31 and the annular protrusion 32 are coaxially arranged, and the annular protrusion 32 is arranged in the middle of the body 31 and abuts against the hole wall. Specifically, the annular protrusion 32 is arranged in the middle of the body 31, which can further increase the compression amount and improve the sealing effect, and can prevent the seal 3 from being over-assembled, and has a thrust function.

[0047] In this embodiment, the diameter of the body 31 gradually decreases from the middle to the two ends. In this way, the body 31 is olive-shaped. Due to the symmetrical design of the body 31, there is no need to consider the assembly direction. The small diameters at both ends of the body 31 can facilitate the installation of the seal 3 into the injection hole 11. The large diameter of the middle part of the body 31 is interference-fitted with the injection hole 11 to achieve compression of the body 31, thereby achieving the effect of sealing the injection hole 11.

[0048] The present invention further provides a battery casing, which includes a casing assembly and a top cover 1 structure of any of the above embodiments, wherein the top cover 1 and the casing assembly are arranged to form a closed space, and the closed space is used to install battery cells.

[0049] It can be understood that the battery shell of the present invention uses the above-mentioned top cover 1 structure, so that the top cover 1 of the top cover 1 structure has an injection hole 11, and the top cover 1 is provided with an annular portion 12 surrounding the injection hole 11, the annular portion 12 is coaxially arranged with the injection hole 11, and the hole wall of the injection hole 11 extends to the annular portion 12 along the axial direction of the injection hole 11, and the sealing member 3 is arranged in the injection hole 11, and the cap 2 is connected to the top cover 1, and is used to press the sealing member 3 into the injection hole 11 so that the sealing member 3 and the hole wall have an interference fit, and due to the design of the annular portion 12, the hole wall area of ​​the injection hole 11 can be increased, so that the contact area between the sealing member 3 and the hole wall is increased, and the cap 2 can prevent the sealing member 3 from falling off from the hole wall, so that the seal is more reliable, thereby improving the sealing effect of the injection hole 11.

[0050] The present invention also provides a battery, comprising a battery core and the battery casing of the above embodiment, wherein the battery core is installed in a closed space.

[0051] It can be understood that the battery of the present invention uses the top cover 1 structure of the above-mentioned battery shell, so that the top cover 1 of the top cover 1 structure has an injection hole 11, and the top cover 1 is provided with an annular portion 12 surrounding the injection hole 11, the annular portion 12 is coaxially arranged with the injection hole 11, and the hole wall of the injection hole 11 extends to the annular portion 12 along the axial direction of the injection hole 11, and the sealing member 3 is arranged in the injection hole 11, and the cap 2 is connected to the top cover 1, and is used to press the sealing member 3 into the injection hole 11 so that the sealing member 3 and the hole wall have an interference fit. Due to the design of the annular portion 12, the hole wall area of ​​the injection hole 11 can be increased, so that the contact area between the sealing member 3 and the hole wall is increased, and the cap 2 can prevent the sealing member 3 from falling off from the hole wall, so that the seal is more reliable, thereby improving the sealing effect of the injection hole 11.

[0052] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A top cover structure, characterized in that: include: A top cover, a cover cap and a sealing member, wherein the top cover has a liquid injection hole, the top cover is provided with an annular portion surrounding the liquid injection hole, the annular portion is coaxially arranged with the liquid injection hole, the hole wall of the liquid injection hole extends to the annular portion along the axial direction of the liquid injection hole, the sealing member is arranged in the liquid injection hole, the cover cap is connected to the top cover, and is used to press the sealing member into the liquid injection hole so that the sealing member and the hole wall have an interference fit.

2. The top cover structure according to claim 1, characterized in that: The top cover is provided with a positioning hole, and the injection hole is located at the bottom of the positioning hole; The cap includes a mounting portion, a positioning portion and a fixing portion, the mounting portion is connected to the fixing portion through the positioning portion, the positioning portion is received in the positioning hole, the mounting portion is connected to the top cover, and the fixing portion is elastically abutted against the sealing member.

3. The top cover structure according to claim 2, characterized in that: The positioning portion is disposed around the outer side of the fixing portion in the circumferential direction and protrudes from the mounting portion and the fixing portion toward the positioning hole, so as to form an annular groove disposed around the fixing portion on a side of the positioning portion away from the positioning hole.

4. The top cover structure according to claim 2, characterized in that: The plane where the fixing portion is located is flush with the plane where the mounting portion is located, or the fixing portion is at least partially located in the positioning hole.

5. The top cover structure according to claim 2, characterized in that: The annular portion is located on a side of the top cover away from the positioning hole, and one end of the annular portion away from the top cover is inclined toward a side away from the injection hole to form a flange structure, and a clamping groove is formed between the flange structure and the top cover; The top cover structure also includes a lower plastic, and the lower plastic portion is connected to the clamping groove.

6. The top cover structure according to claim 5, characterized in that: The lower plastic comprises a main body, and a clamping part and an abutting part connected to the main body, the main body is connected to the top cover, the clamping part is clamped in the clamping groove, and the abutting part abuts against the sealing member; A liquid injection groove is provided around the abutting portion where the abutting portion abuts against the sealing member, and the liquid injection groove is used for injecting liquid.

7. The roof structure according to any one of claims 1 to 6, characterized in that: The sealing member comprises a body and an annular protrusion, wherein the body and the annular protrusion are coaxially arranged, and the annular protrusion is arranged in the middle of the body and abuts against the hole wall.

8. The top cover structure according to claim 7, characterized in that: The diameter of the body gradually decreases from the middle part to the two ends.

9. A battery casing, characterized in that: The battery casing comprises a shell assembly and a top cover structure as claimed in any one of claims 1 to 8, wherein the top cover and the shell assembly are arranged to form a closed space, and the closed space is used for installing a battery cell.

10. A battery, characterized in that: The battery comprises a battery cell and a battery casing as claimed in claim 9, wherein the battery cell is installed in the closed space.

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