Battery structure assembly and battery

Abstract

The utility model relates to the technical field of energy storage equipment, in particular to a battery structure assembly and a battery, and the battery structure assembly comprises a cover plate and a sealing plug. Wherein a liquid injection hole is formed in the cover plate, the sealing plug blocks the liquid injection hole, a protruding part is annularly arranged on the side wall of the part, located in the battery, of the sealing plug, the protruding part and the liquid injection hole are coaxially arranged, and the diameter of the protruding part is larger than that of the liquid injection hole. The protruding part and the edge of the liquid injection hole can be tightly pressed by high voltage generated when the battery cell works, namely the sealing plug is reversely buckled at the liquid injection hole, so that the sealing plug can be prevented from being ejected out, electrolyte leakage is prevented, and the air tightness of the battery is guaranteed. The battery comprises a shell and the battery structure assembly, the cover plate covers the opening of the shell, and the cover plate is hermetically connected with the shell to form a shell of the battery. According to the battery, the sealing plug can be prevented from being ejected out, so that electrolyte leakage is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage equipment technical field especially relates to a battery structure assembly and battery. BACKGROUND

[0002] The battery generally sets up the liquid injection hole on the cover plate, in order to inject the electrolyte into the battery, then seals the sealing plug in the liquid injection hole, to guarantee that electrolyte does not leak out. The conventional sealing plug is cylindrical structure, after the sealing plug is pressed tightly to block the liquid injection hole, the sealing plug can be pushed out due to the high air pressure generated by the cell work, resulting in electrolyte leakage. SUMMARY

[0003] One purpose of the utility model is to provide a battery structure assembly, which can prevent the sealing plug from being pushed out, thereby preventing electrolyte leakage.

[0004] To achieve this purpose, the utility model adopts the following technical scheme:

[0005] A battery structure assembly is provided, comprising:

[0006] A cover plate, the cover plate is provided with a liquid injection hole;

[0007] A sealing plug, the sealing plug blocks the liquid injection hole, a side wall of a part of the sealing plug located in the battery is provided with a protruding part, the protruding part is coaxially arranged with the liquid injection hole, and the diameter of the protruding part is greater than the diameter of the liquid injection hole.

[0008] Optionally, the protruding part comprises a first protruding part and a second protruding part arranged in sequence on the side wall of the sealing plug along the axial direction of the liquid injection hole, the diameter of the first protruding part is smaller than the diameter of the second protruding part, and the first protruding part is closer to the cover plate than the second protruding part.

[0009] Optionally, the sealing plug further comprises a frustum, and the frustum is located at one end of the protruding part away from the cover plate.

[0010] Optionally, the diameter of the part of the sealing plug located at the liquid injection hole is greater than the diameter of the liquid injection hole.

[0011] Optionally, the difference between the diameter of the part of the sealing plug located at the liquid injection hole and the diameter of the liquid injection hole is 0.15mm-0.25mm.

[0012] Optionally, the sealing plug further comprises an outer part, the outer part is located outside the battery, the outer part is attached to the end face of the cover plate towards the outside of the battery, the outer part is coaxially arranged with the liquid injection hole, and the diameter of the outer part is greater than the diameter of the liquid injection hole.

[0013] Optionally, the cover plate is provided with a limiting groove on the end face outside the battery, the limiting groove is coaxially arranged with the liquid injection hole, and the overhanging part is located at the limiting groove.

[0014] Optionally, the overhanging part has an axial dimension of 0.2-0.4 mm.

[0015] Optionally, the cover plate around the liquid injection hole is provided with a rounded corner.

[0016] Another purpose of the utility model lies in providing a battery which can prevent the sealing plug from being pushed out and thus prevent electrolyte from leaking.

[0017] To achieve the purpose, the utility model adopts the following technical scheme.

[0018] The utility model provides a battery which comprises a shell and the above-mentioned battery structure assembly, the cover plate is covered on the opening of the shell, and the cover plate is sealingly connected with the shell to form the shell of the battery.

[0019] The utility model has the advantages of:

[0020] The utility model provides a battery structure assembly which comprises a cover plate and a sealing plug, wherein the cover plate is provided with a liquid injection hole, the sealing plug is used for plugging the liquid injection hole, a side wall of the part of the sealing plug located in the battery is provided with an overhanging part, the overhanging part is coaxially arranged with the liquid injection hole, and the diameter of the overhanging part is larger than that of the liquid injection hole.

[0021] The utility model also provides a battery which comprises a shell and the above-mentioned battery structure assembly, the cover plate is covered on the opening of the shell, and the cover plate is sealingly connected with the shell to form the shell of the battery. DRAWINGS

[0022] Figure 1 is a structural schematic view of the battery structure assembly provided by the utility model embodiment;

[0023] Figure 2 is an exploded view of the battery structure assembly provided by the utility model embodiment;

[0024] Figure 3 is a sectional view of the battery structure assembly provided by the utility model embodiment;

[0025] Figure 4 is a sectional view of the sealing plug provided by the utility model embodiment;

[0026] Figure 5 is a sectional view of the cover plate provided by the embodiment of the utility model.

[0027] In the drawings:

[0028] 1, cover plate; 11, liquid injection hole; 12, limiting groove;

[0029] 2, sealing plug; 21, first protruding part; 22, second protruding part; 23, conical part; 24, outer lapping part; 241, groove; 25, sealing part. DETAILED DESCRIPTION

[0030] The technical scheme of the utility model will be further described below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not limit the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for the convenience of description, not all.

[0031] In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] In the utility model, unless otherwise explicitly specified and limited, the first feature is "on" or "below" the second feature, which can include direct contact between the first and second features, or indirect contact between the first and second features through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0033] As shown in Figures 1-5 The battery structure assembly of the embodiment includes a cover plate 1 and a sealing plug 2. The cover plate 1 is provided with a liquid injection hole 11, and the sealing plug 2 seals the liquid injection hole 11. The side wall of the part of the sealing plug 2 located in the battery is provided with a protruding part, the protruding part is coaxially arranged with the liquid injection hole 11, and the diameter of the protruding part is greater than that of the liquid injection hole 11. The high pressure generated during the operation of the battery cell can press the protruding part and the edge of the liquid injection hole 11, that is, the sealing plug 2 is reversely buckled at the liquid injection hole 11, which can prevent the sealing plug 2 from being pushed out, thereby preventing the leakage of electrolyte and ensuring the air tightness of the battery.

[0034] Optionally, the protrusion includes a first protrusion 21 and a second protrusion 22 arranged in sequence along the axial direction of the liquid injection hole 11 on the side wall of the sealing plug 2, the diameter of the first protrusion 21 is smaller than that of the second protrusion 22, and the first protrusion 21 is closer to the cover plate 1 than the second protrusion 22.

[0035] Optionally, the sealing plug 2 further includes a sealing portion 25, which is located at the liquid injection hole 11, i.e., the sealing portion 25, the first protrusion 21 and the second protrusion 22 are arranged in sequence along the axial direction of the liquid injection hole 11. Optionally, there is a circumferential recess groove between the sealing portion 25 and the first protrusion 21, and the sealing portion 25 and the first protrusion 21 are smoothly transitioned. The recess groove helps the first protrusion 21 to stack materials to abut against the end face of the cover plate 1 towards the inside of the battery when the sealing plug 2 is pushed outwards.

[0036] Optionally, there is also a circumferential recess groove between the first protrusion 21 and the second protrusion 22, and the first protrusion 21 and the second protrusion 22 are smoothly transitioned. When the pressure inside the battery is too large, the first protrusion 21 has been pushed and squeezed into the liquid injection hole 11, and the recess groove between the first protrusion 21 and the second protrusion 22 helps the second protrusion 22 to stack materials to abut against the end face of the cover plate 1 towards the inside of the battery, so as to transfer the pushing force on the sealing plug 2 to the cover plate 1, and ensure that the sealing plug 2 is not further pushed out.

[0037] It is known that the smooth transition is conducive to the assembly of the sealing plug 2, and can increase the axial resistance performance of the first protrusion 21 and the second protrusion 22, prevent cracks from occurring at the root of the first protrusion 21 or the second protrusion 22 under stress during assembly, and ensure the effectiveness of the first protrusion 21 and the second protrusion 22.

[0038] Optionally, the sealing plug 2 further includes a frustum portion 23, which is located at one end of the protrusion away from the cover plate 1. The small-diameter end of the frustum portion 23 is farther away from the liquid injection hole 11 than the large-diameter end, i.e., the side wall of the frustum portion 23 can have a guiding effect when the sealing plug 2 is assembled, facilitating assembly. Moreover, compared with a cylindrical structure, the frustum structure can reduce the occupied space. Furthermore, the frustum portion 23 can also correct the sealing defect of the sealing plug 2 tilting to one side.

[0039] Optionally, the diameter of the part of the sealing plug 2 at the liquid injection hole 11 is larger than the diameter of the liquid injection hole 11, i.e. the diameter of the sealing part 25 is larger than the diameter of the liquid injection hole 11, i.e. the sealing plug 2 is in interference fit with the liquid injection hole 11. Optionally, the diameter of the first protruding part 21 is further larger than the diameter of the sealing part 25 to ensure a first anti-ejection function of the first protruding part 21, and the diameter of the second protruding part 22 is larger than the diameter of the first protruding part 21 to ensure a second anti-ejection function of the second protruding part 22.

[0040] Optionally, the difference between the diameter of the part of the sealing plug 2 at the liquid injection hole 11 and the diameter of the liquid injection hole 11 is in the range of 0.15mm-0.25mm. In the embodiment, the diameter a of the sealing part 25 is 0.36mm, the diameter d of the liquid injection hole 11 is 0.34mm, and the difference between the two is 0.2mm. Too large difference is not conducive to assembly, and too small difference is not conducive to interference fit.

[0041] Optionally, the axial length c of the sealing plug 2 is in the range of 3.2mm-4.2mm. Preferably, the axial length c of the sealing plug 2 is 3.7mm. Too long axial length of the sealing plug 2 is prone to bending deformation, and occupies too much space, and too short axial length is not conducive to assembly and clamping.

[0042] Optionally, the sealing plug 2 further comprises an outer lap part 24, the outer lap part 24 is located outside the battery, and the outer lap part 24 is attached to the end face of the cover plate 1 towards the outside of the battery, the outer lap part 24 is coaxially arranged with the liquid injection hole 11, and the diameter of the outer lap part 24 is larger than the diameter of the liquid injection hole 11. In the embodiment, the outer lap part 24 is connected with the sealing part 25 along the axial direction of the sealing plug 2. The setting of the outer lap part 24 eliminates the need for additional conventional structural sealing steel sheets to cover the sealing plug 2 from the outside, ensuring the sealing safety of the sealing plug 2.

[0043] Optionally, a groove 241 is formed on the end face of the outer lap part 24 towards the outside of the battery.

[0044] Optionally, a limiting groove 12 is formed on the end face of the cover plate 1 towards the outside of the battery, the limiting groove 12 is coaxially arranged with the liquid injection hole 11, and the outer lap part 24 is located at the limiting groove 12.

[0045] Optionally, the size of the outer lap part 24 along the axial direction of the liquid injection hole 11 is in the range of 0.2mm-0.4mm, i.e. Figure 4 the size b of the outer lap part 24 along the axial direction of the liquid injection hole 11 is in the range of 0.2mm-0.4mm, and preferably, the size b of the outer lap part 24 along the axial direction of the liquid injection hole 11 is 0.3mm. Optionally, the groove depth e of the limiting groove 12 is also 0.3mm, i.e. the outer lap part 24 is flush with the end face of the cover plate 1 towards the outside of the battery.

[0046] Optionally, the cover plate 1 around the liquid injection hole 11 is provided with a rounded corner, that is, the side edge between the bottom of the limiting groove 12 and the inner side wall of the liquid injection hole 11 is provided with an R rounded corner, so as to increase the adaptability of the transition area of the outer lap part 24 and the sealing part 25 of the sealing plug 2.

[0047] Optionally, the outer edge of the small-diameter end of the frustoconical part 23 is also provided with a curved surface transition, so as to prevent the sharp edge from scratching the components inside the battery.

[0048] Optionally, the material of the sealing plug 2 is PFA, ethylene-propylene-diene rubber, meltable polytetrafluoroethylene or thermoplastic elastomer.

[0049] Optionally, in other embodiments, in order to improve the structural strength of the sealing plug 2, a structure with higher hardness can also be arranged in the core of the sealing plug 2, which can be provided in a columnar shape, a double-frustoconical shape with the two frustoconical parts arranged in opposite directions or other shapes, and the outer layer is wrapped with the elastic material mentioned above.

[0050] The embodiment also provides a battery, which comprises a shell and the battery structure assembly, the cover plate 1 is arranged on the opening of the shell, and the cover plate 1 is sealingly connected with the shell to form a shell of the battery, and the shell is arranged with a battery core. The battery can prevent the sealing plug 2 from being pushed out, so as to prevent the electrolyte from leaking. In the embodiment, the battery is a cylindrical battery, and in other embodiments, the battery can also be a square battery and the like.

[0051] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation on the embodiments of the utility model. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments need not and cannot be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A battery structure assembly, characterized by, The application relates to a battery structure assembly. The application relates to a battery structure assembly. The application relates to a battery structure assembly.

2. The battery structural assembly of claim 1, wherein, The application relates to a battery structure assembly.

3. The battery structural assembly of claim 1, wherein, The application relates to a battery structure assembly.

4. The battery structural assembly of claim 1, wherein, The application relates to a battery structure assembly.

5. The battery structural assembly of claim 4, wherein, The application relates to a battery structure assembly.

6. The battery structural assembly of any one of claims 1-5, wherein, The application relates to a battery structure assembly.

7. The battery structural assembly of claim 6, wherein, The application relates to a battery structure assembly.

8. The battery structural assembly of claim 6, wherein, The application relates to a battery structure assembly.

9. The battery structural assembly of any one of claims 1-5, wherein, The application relates to a battery structure assembly.

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