Cover plate structure and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a cover plate structure and a battery, the cover plate structure comprises: a cover plate body provided with a liquid injection hole; a plug hole, a first step part and a second step part are sequentially formed in the liquid injection hole in the axis direction of the liquid injection hole; the sealing plug is suitable for sealing the plug hole; the primary sealing piece can be assembled on the first step part to limit the sealing plug to be separated from the plug hole in the axis direction; and the secondary sealing piece can be assembled on the second step part to limit the sealing plug to be separated from the plug hole in the axis direction. According to the cover plate structure provided by the utility model, the sealing elements can be arranged on the junction surface of the two layers of sealing elements in batches by forming the junction surface of the two layers of sealing elements, so that the effect of secondarily sealing the liquid injection hole is realized, secondary liquid injection is facilitated when electrolyte in a battery cell is insufficient or the voltage of the battery is reduced, and the service life of the battery cell is prolonged. And the defect that the liquid injection hole cannot perform secondary liquid injection is overcome.

Description

Technical Field

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

[0002] After battery cells are assembled, electrolyte must be injected and the injection holes must be sealed. If the battery is running low on electrolyte or the battery voltage drops, the battery life can be shortened. Simply scrapping the battery would be a waste of resources.

[0003] If the battery is to be refilled with liquid for the second time, the original sealing structure needs to be removed. In the related art, after the original sealing structure at the injection hole is removed, the secondary sealing is often not well achieved, and the problem of loose sealing or even leakage is likely to occur. Utility Model Content

[0004] In view of this, the utility model provides a cover plate structure and a battery to solve the problem that the secondary liquid filling of the battery cannot achieve secondary sealing well.

[0005] In a first aspect, the present invention provides a cover plate structure, comprising:

[0006] The cover plate body is provided with a liquid injection hole; along the axial direction of the liquid injection hole, the liquid injection hole is sequentially formed with a plug hole, a first step portion and a second step portion;

[0007] Sealing plug, suitable for sealing the plug hole;

[0008] A primary seal can be assembled on the first step portion to limit the sealing plug from escaping from the plug hole along the axial direction; or a secondary seal can be assembled on the second step portion to limit the sealing plug from escaping from the plug hole along the axial direction.

[0009] Beneficial effect: By sequentially forming a plug hole, a first step portion, and a second step portion at the position of the injection hole, the sealing plug is sealed in the plug hole during the first injection, and then the primary seal is assembled at the position of the first step portion to restrict the sealing plug from escaping from the plug hole along the axial direction, thereby achieving a double seal. When the electrolyte inside the battery is insufficient or the battery voltage drops, when a second injection is required, the primary seal can be removed and the sealing plug can be pulled out of the plug hole. After the electrolyte is replenished, the sealing plug is sealed in the plug hole again, and the secondary seal is assembled at the position of the second step portion to restrict the sealing plug from escaping from the plug hole along the axial direction. This facilitates the secondary injection of the battery, and after the second sealing, since the sealing surface is no longer the sealing surface used during the first sealing, the sealing effect of the secondary seal assembled at the position of the second step portion can be effectively guaranteed, thereby avoiding leakage problems and ensuring good sealing. The cover plate structure provided by the embodiment of the present utility model is provided with a plug hole, a first step portion and a second step portion in sequence on the cover plate body along the axial direction of the injection hole; by forming two layers of sealing member bonding surfaces and correspondingly arranging two sealing members, namely a primary seal and a secondary seal, the function of secondary sealing of the injection hole is achieved, which is convenient for secondary injection when there is insufficient electrolyte inside the battery cell or the battery voltage drops, thereby achieving the effect of increasing the battery service life and saving resources, and overcoming the defect that the injection hole cannot be injected for the second time.

[0010] In an optional embodiment, along the axial direction of the liquid injection hole, the first step portion and the second step portion are staggered;

[0011] The bottom surface of the first step portion and the area located on the circumference surrounding the plug hole form a first contact surface, and the first contact surface supports the primary seal;

[0012] A bottom surface of the second step portion and an area surrounding the first step portion form a second contact surface, and the second contact surface supports the secondary seal.

[0013] Beneficial effect: By staggering the first step portion and the second step portion, it can be ensured that the first contact surface and the second contact surface are in different planes, thereby ensuring that when the two respectively support the primary seal and the secondary seal, the primary seal and the secondary seal can be in different planes respectively, ensuring the independence of the two weldings and non-interference with each other, effectively ensuring the sealing effect of the primary seal and the secondary seal, avoiding leakage problems, and ensuring good sealing.

[0014] In an optional embodiment, the primary sealing member is connected to the first contact surface by welding; and the secondary sealing member is connected to the second contact surface by welding.

[0015] In an optional embodiment, in a plane perpendicular to the axis of the liquid injection hole, the cross-sectional area of ​​the first step portion is larger than the cross-sectional area of ​​the plug hole, and the cross-sectional area of ​​the second step portion is larger than the cross-sectional area of ​​the first step portion.

[0016] Advantageous Effects: By making the cross-sectional area of ​​the first step larger than the cross-sectional area of ​​the plug hole, interference with the first step can be avoided when placing the sealing plug, ensuring a smooth installation process. Interference can also be avoided when removing the sealing plug. By making the cross-sectional area of ​​the second step larger than the cross-sectional area of ​​the first step, interference with the second step can be avoided when placing the primary seal, ensuring a smooth installation process. Interference with the second step can also be avoided when removing the primary seal.

[0017] In an optional embodiment, the first step portion is configured as a rotation groove centered on the axis of the plug hole; and the second step portion is configured as a rotation groove centered on the axis of the plug hole.

[0018] Beneficial effect: The central symmetry can improve the alignment between the sealing plug and the primary seal, as well as the sealing plug and the secondary seal, thereby ensuring the sealing effect.

[0019] In an optional embodiment, the radial edge of the first step portion is inclined, and the radial edge of the second step portion is inclined.

[0020] Beneficial effects: improving the assembly efficiency between the primary seal and the first step portion, as well as the assembly efficiency between the secondary seal and the second step portion, so that the inclined structure plays a guiding role, while improving the centering after assembly and ensuring the sealing effect.

[0021] In an optional embodiment, the cross-sectional area of ​​the primary seal is smaller than the cross-sectional area of ​​the secondary seal.

[0022] Beneficial effects: On the one hand, it can facilitate operators to quickly distinguish between primary seals and secondary seals; on the other hand, it can play a fool-proof role, so that the primary seal can only be assembled with the first step portion, and the secondary seal can only be assembled with the second step portion, avoiding assembly errors, thereby effectively matching the primary sealing process and the secondary sealing process.

[0023] In an optional embodiment, the sealing plug is interference fit with the plug hole.

[0024] In a second aspect, the present invention further provides a battery, comprising: the cover plate structure as described above.

[0025] In an optional embodiment, the battery further comprises:

[0026] The housing is provided with an opening;

[0027] The cover plate structure is arranged to cover the opening of the shell; and the cover plate structure and the shell together enclose a receiving cavity;

[0028] The accommodating cavity is suitable for accommodating the electrode group and the electrolyte;

[0029] The accommodating cavity is communicated with the outside via the liquid injection hole.

[0030] Since the battery includes a cover plate structure, it has the same effect as the cover plate structure and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is a schematic diagram of the cover structure of the utility model;

[0033] Figure 2 It is a cross-sectional schematic diagram of the cover body of the utility model;

[0034] Figure 3 This is a cross-sectional diagram of the cover body of the utility model after the sealing plug is installed;

[0035] Figure 4 This is a cross-sectional diagram of the installation of a sealing plug and a primary seal on the cover body of the utility model;

[0036] Figure 5 This is a cross-sectional diagram of the installation of a sealing plug and a secondary sealing member on the cover body of the present invention;

[0037] Description of reference numerals:

[0038] 1. Cover plate body; 2. Liquid injection hole; 21. Plug hole; 22. First step portion; 23. Second step portion;

[0039] 3. Sealing plug; 4. Primary seal; 5. Secondary seal. DETAILED DESCRIPTION

[0040] 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 drawings in the embodiments of the present invention. Obviously, the embodiments described 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.

[0041] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0043] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0044] The following combination Figures 1 to 5 , describing the embodiments of the present utility model.

[0045] According to an embodiment of the present invention, on the one hand, a cover plate structure is provided, comprising:

[0046] The cover body 1 is provided with a liquid injection hole 2; along the axial direction of the liquid injection hole 2, the liquid injection hole 2 is sequentially formed with a plug hole 21, a first step portion 22 and a second step portion 23;

[0047] A sealing plug 3, adapted to seal the plug hole 21;

[0048] The primary seal 4 can be assembled on the first step portion 22 to limit the sealing plug 3 from escaping from the plug hole 21 along the axial direction; or the secondary seal 5 can be assembled on the second step portion 23 to limit the sealing plug 3 from escaping from the plug hole 21 along the axial direction.

[0049] In this embodiment, the cover body 1 is adapted to cover the opening of the housing. Together, the cover body 1 and the housing form a housing cavity suitable for accommodating the electrode assembly and electrolyte. The cover body 1 has an inner surface facing the electrode assembly and an outer surface facing away from the electrode assembly.

[0050] The cover body 1 is provided with a liquid injection hole 2 ; the liquid injection hole 2 passes through the cover body 1 so as to inject the electrolyte into the accommodating cavity.

[0051] Along the axial direction of the liquid injection hole 2 and from the inner surface toward the outer surface of the cover body 1 , a plug hole 21 , a first step portion 22 and a second step portion 23 are sequentially formed.

[0052] By sequentially forming a plug hole 21, a first step 22, and a second step 23 at the injection hole 2, the sealing plug 3 is sealed against the plug hole 21 during the first injection, and the primary seal 4 is subsequently assembled at the first step 22 to prevent the sealing plug 3 from axially dislodging from the plug hole 21, thereby achieving a double seal. When the battery is running low on electrolyte or the battery voltage drops, a second injection is required. The primary seal 4 can be removed and the sealing plug 3 can be pulled out of the plug hole 21. After the electrolyte is replenished, the sealing plug 3 is again sealed against the plug hole 21, and the secondary seal 5 is assembled at the second step 23 to prevent the sealing plug 3 from axially dislodging from the plug hole 21. This facilitates secondary injection of the battery, and after the second sealing, since the sealing surface is no longer the same as that used during the first sealing, the sealing effect of the secondary seal 5 assembled at the second step 23 can be effectively maintained, avoiding leakage and ensuring a good seal.

[0053] In some embodiments, the primary seal 4 is welded to the first step portion 22; due to the use of welding, when the primary seal 4 is removed, the surface quality of the first step portion 22 is easily reduced, and it is not suitable to re-weld the first step portion 22 again.

[0054] In some embodiments, the secondary seal 5 is welded to the second step 23. Since the secondary seal 5 is no longer welded at the first step 22 but at the second step 23, the sealing surface is no longer the same sealing surface used in the primary seal. This effectively ensures the sealing effect of the secondary seal 5 assembled at the second step 23, avoids leakage, and ensures a good seal.

[0055] The cover plate structure provided by the embodiment of the present utility model is provided with a plug hole 21, a first step portion 22 and a second step portion 23 in sequence on the cover plate body 1 along the axial direction of the liquid injection hole 2; by forming two layers of sealing member bonding surfaces and correspondingly arranging two sealing members, namely a primary seal 4 and a secondary seal 5, the function of secondary sealing of the liquid injection hole is achieved, which is convenient for secondary injection when the electrolyte inside the battery cell is insufficient or the battery voltage drops, thereby achieving the effect of increasing the battery life and saving resources, and overcoming the defect that the liquid injection hole cannot be injected twice.

[0056] In some embodiments, combined Figure 2 、 Figure 4 、 Figure 5 As shown, along the axial direction of the liquid injection hole 2, the first step portion 22 and the second step portion 23 are staggered;

[0057] The bottom surface of the first step portion 22 and the area surrounding the plug hole 21 form a first contact surface, and the first contact surface supports the primary seal 4;

[0058] The bottom surface of the second step portion 23 and the area surrounding the first step portion 22 form a second contact surface, and the second contact surface supports the secondary seal 5 .

[0059] In this embodiment, the bottom surface of the first step portion 22 and the area located on the circumferential side surrounding the plug hole 21 form a first contact surface, and the bottom surface of the second step portion 23 and the area located on the circumferential side surrounding the first step portion 22 form a second contact surface. By staggering the first step portion 22 and the second step portion 23 along the axial direction of the injection hole 2, it is possible to ensure that the first contact surface and the second contact surface are in different planes, thereby ensuring that when the two respectively support the primary seal 4 and the secondary seal 5, the primary seal 4 and the secondary seal 5 can be in different planes respectively, ensuring the independence of the two weldings and non-interference with each other, effectively ensuring the sealing effect of the primary seal 4 and the secondary seal 5, avoiding leakage problems, and ensuring good sealing.

[0060] In some embodiments, the primary sealing member 4 is connected to the first contact surface by welding; and the secondary sealing member 5 is connected to the second contact surface by welding.

[0061] In this embodiment, the cover body 1 may be made of aluminum, aluminum alloy, steel, etc. Correspondingly, the primary seal 4 and the secondary seal 5 are made of the same material as the cover body 1 to ensure the welding effect.

[0062] In this embodiment, the sealing plug 3 may be made of rubber or plastic.

[0063] In some embodiments, the sealing plug 3 is interference-fitted with the plug hole 21, so that the sealing plug 3 and the plug hole 21 can be tightly fitted at the matching position to ensure a sealing effect.

[0064] In some embodiments, combined Figure 2 As shown, in a plane perpendicular to the axis of the liquid injection hole 2 , the cross-sectional area of ​​the first step portion 22 is larger than the cross-sectional area of ​​the plug hole 21 , and the cross-sectional area of ​​the second step portion 23 is larger than the cross-sectional area of ​​the first step portion 22 .

[0065] By making the cross-sectional area of ​​the first step 22 larger than the cross-sectional area of ​​the plug hole 21, interference from the first step 22 can be avoided when placing the sealing plug 3, ensuring a smooth installation process. Interference can also be avoided when removing the sealing plug 3.

[0066] By making the cross-sectional area of ​​the second step portion 23 larger than that of the first step portion 22, interference with the second step portion 23 can be avoided when placing the primary seal 4, ensuring a smooth installation process. Interference with the second step portion 23 can also be avoided when removing the primary seal 4.

[0067] In some embodiments, the first step portion 22 is configured as a rotation groove centered on the axis of the plug hole 21 ; the second step portion 23 is configured as a rotation groove centered on the axis of the plug hole 21 .

[0068] The central symmetry is adopted to improve the centering of the sealing plug 3 and the primary sealing member 4, as well as the centering of the sealing plug 3 and the secondary sealing member 5, thereby ensuring the sealing effect.

[0069] In some embodiments, combined Figure 2 As shown, the radial edge of the first step portion 22 is inclined, and the radial edge of the second step portion 23 is inclined.

[0070] Correspondingly, the radial edges of the primary seal 4 and the secondary seal 5 both adopt an inclined structure with matching shapes, thereby improving the assembly efficiency of the primary seal 4 and the first step portion 22, as well as the assembly efficiency of the secondary seal 5 and the second step portion 23, so that the inclined structure plays a guiding role, while improving the centering after assembly and ensuring the sealing effect.

[0071] In some embodiments, combined Figure 4 、 Figure 5 As shown, the cross-sectional area of ​​the primary seal 4 is smaller than the cross-sectional area of ​​the secondary seal 5 .

[0072] On the one hand, it can facilitate the operator to quickly distinguish the primary seal 4 from the secondary seal 5. On the other hand, it can play a fool-proof role, so that the primary seal 4 can only be assembled with the first step portion 22, and the secondary seal 5 can only be assembled with the second step portion 23, avoiding assembly errors, thereby effectively matching the primary sealing process and the secondary sealing process.

[0073] According to an embodiment of the present invention, on the other hand, a battery is provided, comprising: the cover plate structure as described above.

[0074] In some embodiments, the battery further comprises:

[0075] The housing is provided with an opening;

[0076] The cover plate structure is arranged to cover the opening of the shell; and the cover plate structure and the shell together enclose a receiving cavity;

[0077] The accommodating cavity is suitable for accommodating the electrode group and the electrolyte;

[0078] The accommodating chamber is communicated with the outside via the liquid injection hole 2 .

[0079] Obviously, the above embodiments are merely examples for the purpose of clarity of explanation and are not intended to limit the implementation methods. Although the embodiments of the present invention have been described in conjunction with 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, and such modifications and variations are all within the scope defined by the present invention.

Claims

1. A cover plate structure, characterized in that: include: The cover plate body (1) is provided with a liquid injection hole (2); along the axial direction of the liquid injection hole (2), the liquid injection hole (2) is sequentially formed with a plug hole (21), a first step portion (22) and a second step portion (23); A sealing plug (3) adapted to seal the plug hole (21); A primary seal (4) which can be assembled on the first step portion (22) to limit the sealing plug (3) from being dislodged from the plug hole (21) along the axial direction; or a secondary seal (5) which can be assembled on the second step portion (23) to limit the sealing plug (3) from being dislodged from the plug hole (21) along the axial direction.

2. The cover plate structure according to claim 1, characterized in that: Along the axial direction of the liquid injection hole (2), the first step portion (22) and the second step portion (23) are arranged in staggered layers; The bottom surface of the first step portion (22) and the area surrounding the plug hole (21) form a first contact surface, and the first contact surface supports the primary seal (4); The bottom surface of the second step portion (23) and the area located on the circumferential side surrounding the first step portion (22) form a second contact surface, and the second contact surface supports the secondary seal (5).

3. The cover plate structure according to claim 2, characterized in that: The primary sealing member (4) is connected to the first contact surface by welding; and the secondary sealing member (5) is connected to the second contact surface by welding.

4. The cover plate structure according to claim 1, characterized in that: In a plane perpendicular to the axis of the injection hole (2), the cross-sectional area of ​​the first step portion (22) is larger than the cross-sectional area of ​​the plug hole (21), and the cross-sectional area of ​​the second step portion (23) is larger than the cross-sectional area of ​​the first step portion (22).

5. The cover plate structure according to claim 1, characterized in that: The first step portion (22) is configured as a rotation groove centered on the axis of the plug hole (21); and the second step portion (23) is configured as a rotation groove centered on the axis of the plug hole (21).

6. The cover plate structure according to claim 5, characterized in that: The radial edge of the first step portion (22) is inclined, and the radial edge of the second step portion (23) is inclined.

7. The cover plate structure according to any one of claims 1 to 6, characterized in that: The cross-sectional area of ​​the primary sealing member (4) is smaller than the cross-sectional area of ​​the secondary sealing member (5).

8. The cover plate structure according to any one of claims 1 to 6, characterized in that: The sealing plug (3) is interference-fitted with the plug hole (21).

9. A battery, characterized in that: The invention comprises the cover plate structure according to any one of claims 1 to 8.

10. The battery according to claim 9, characterized in that The battery further comprises: The housing is provided with an opening; The cover plate structure is disposed on the opening of the housing; and the cover plate structure and the housing together enclose a receiving cavity; The accommodating cavity is suitable for accommodating the electrode group and the electrolyte; The accommodating cavity is connected to the outside via the liquid injection hole (2).

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