Cover plate structure and battery

Abstract

The utility model relates to a cover plate structure and a battery, and relates to the technical field of new energy batteries. The utility model provides a cover plate structure which comprises a cover plate body, a first sealing nail and a sealing structure. The cover plate body is provided with a first liquid injection hole and a second liquid injection hole which are communicated with each other, the first liquid injection hole is arranged close to the top of the cover plate body, the second liquid injection hole is arranged close to the bottom of the cover plate body, and the first liquid injection hole and the second liquid injection hole form a first step surface; the first sealing nail is arranged in the first liquid injection hole in a sealing manner; the sealing structure is arranged in the second liquid injection hole in a sealed mode. The first liquid injection hole is reserved in the cover plate body, so that the second liquid injection hole of the cover plate body can be subjected to repair welding through the first sealing nail when the sealing structure detects that welding is poor or the sealing performance does not conform to a standard product, the waste rate of battery scrapping caused by poor welding of the original sealing nail is reduced, the manufacturing cost is reduced, and the production efficiency is improved. And the reworking efficiency is improved.

Description

Technical Field

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

[0002] Lithium-ion batteries in related technologies are one of the new energy sources and are widely used in our lives. Aluminum-shell batteries have become one of the most widely used battery models among lithium-ion batteries due to their safety advantages.

[0003] Among them, the sealing pin is an important component on the lithium-ion battery cell and is the last laser welding process in the production of lithium battery cells. At present, most battery manufacturers in the new energy industry use a single step injection hole in the sealing pin welding process to weld the sealing pin flush with the large surface of the top cover.

[0004] The inventors have found that the quality of the welding process of the sealing pins is crucial. During the welding process of the sealing pins, defects such as explosion points, air holes, cracks, and welding slag are easily generated. These defects will seriously affect the performance of the battery cells, making the final products scrapped, and causing great cost losses to battery manufacturers. Utility Model Content

[0005] The purpose of the utility model includes providing a cover plate structure and a battery, which can be used to repair the second liquid injection hole reserved on the cover plate body through a first sealing nail.

[0006] The embodiment of the present utility model can be implemented as follows:

[0007] In the first aspect, the utility model proposes a cover structure, including a cover body, a first sealing pin and a sealing structure; the cover body is provided with a first liquid injection hole and a second liquid injection hole that are connected, the first liquid injection hole is arranged close to the top of the cover body, and the second liquid injection hole is arranged close to the bottom of the cover body, and the first liquid injection hole and the second liquid injection hole form a first step surface; the first sealing pin is sealed in the first liquid injection hole; the sealing structure is sealed in the second liquid injection hole.

[0008] Optionally, the second liquid injection hole includes a first opening and a second opening coaxially arranged, the first opening is arranged close to the bottom of the cover body, and the second opening is arranged close to the second liquid injection hole;

[0009] The first opening and the second opening are formed with a second step surface.

[0010] Optionally, the sealing structure includes a sealing glue nail and a second sealing nail, the sealing glue nail is sealingly arranged in the first opening, and the second sealing nail is sealingly arranged in the second opening.

[0011] Optionally, the top of the second sealing pin is flush with the second opening, and the bottom of the second sealing pin abuts against and is welded to the second step surface.

[0012] Optionally, a second avoidance groove is provided at the bottom of the second sealing nail, and the top of the sealing glue nail protrudes from the first opening and is accommodated in the second avoidance groove.

[0013] Optionally, the aperture of the second opening is larger than that of the first opening, and the aperture of the second injection hole is larger than that of the second opening;

[0014] The side wall of the second opening is an inclined surface.

[0015] Optionally, a first avoidance groove is provided at the bottom of the first sealing pin, and the aperture of the first avoidance groove is larger than the aperture of the second sealing pin of the sealing structure.

[0016] Optionally, the top of the first sealing nail is flush with the top surface of the cover plate body, and the bottom of the first sealing nail abuts against and is welded to the first step surface.

[0017] Optionally, the first liquid injection hole and the second liquid injection hole are coaxially arranged;

[0018] The inner wall of the first liquid injection hole is an inclined surface.

[0019] In a second aspect, the present invention further proposes a battery, comprising the cover plate structure and a shell as described in any one of the above items, wherein a battery cell is arranged in the shell, and the cover plate body is sealed and connected to the shell.

[0020] The beneficial effects of the cover plate structure and battery provided by the embodiments of the present invention include:

[0021] By reserving the first liquid injection hole on the cover body, when the sealing structure is found to be poorly welded or the sealing does not meet the standard product, the second liquid injection hole of the cover body can be repaired by using the first sealing nail; this setting can effectively improve the sealing quality rate of the sealing nail in the welding process, reduce the waste rate of the original sealing nail due to poor welding causing the battery to be scrapped, reduce manufacturing costs, and improve rework efficiency.

[0022] Furthermore, by providing the first sealing member and the sealing structure, it is possible to ensure that the liquid injection hole of each battery meets a high sealing standard, thereby improving the overall safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A cross-sectional view of the cover body provided in this embodiment;

[0025] Figure 2 A cross-sectional view of the sealing nail provided in this embodiment;

[0026] Figure 3 A cross-sectional view of the second sealing pin provided in this embodiment;

[0027] Figure 4 A cross-sectional view of a first sealing pin provided in this embodiment;

[0028] Figure 5 A schematic diagram of welding the sealing structure provided in this embodiment to the second liquid injection hole;

[0029] Figure 6 This is a schematic diagram of the cover plate structure provided in this embodiment.

[0030] Icons: 010 - cover structure; 100 - cover body; 110 - first liquid injection hole; 111 - first step surface; 120 - second liquid injection hole; 121 - first opening; 122 - second opening; 123 - second step surface; 200 - sealing structure; 210 - sealing nail; 211 - protrusion; 220 - second sealing nail; 221 - second avoidance groove; 300 - first sealing nail; 310 - first avoidance groove. DETAILED DESCRIPTION

[0031] The sealing pin is an important component of the lithium-ion battery cell and is the last laser welding process in the production of lithium battery cells. Currently, most battery manufacturers in the new energy industry use a single step injection hole in the sealing pin welding process to weld the sealing pin flush with the large surface of the top cover.

[0032] The current welding process for the sealing pin is as follows: inject liquid into the battery through the injection hole, insert the sealing glue pin 210 into the injection hole after the injection is completed, and then implant the sealing pin and perform welding.

[0033] After the welding process is complete, rigorous testing is carried out, including metallographic and sealing tests. If the sealing pins are poorly welded or the sealing does not meet product standards, the entire battery will be scrapped. Therefore, the quality of the sealing pin welding process is crucial.

[0034] The inventors discovered that the welding process of sealing pins can easily produce defects such as explosive spots, pores, cracks, and welding slag. These defects can severely affect the performance of the battery cell, rendering the final product scrapped and resulting in significant cost losses for battery manufacturers. Furthermore, existing battery product structural processes cannot be quickly and effectively reworked, resulting in technical flaws in battery product construction.

[0035] To address the above problems, the present invention provides a sealing structure 200 that can repair the second liquid injection hole 120 reserved on the cover body 100 through the first sealing nail 300, thereby improving the problem of product scrapping caused by poor welding of the sealing nail.

[0036] 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 of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0038] 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, it does not need to be further defined or explained in subsequent drawings.

[0039] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0040] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0041] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention can be combined with each other.

[0042] The overall structure, working principle and technical effects of the cover plate structure 010 provided by the present invention are described in detail below through embodiments and in conjunction with the accompanying drawings.

[0043] The cover plate structure 010 provided by the present invention is applied to batteries, and the batteries may specifically be aluminum shell square lithium batteries, cylindrical lithium batteries, and the like.

[0044] This embodiment provides a battery (not shown), including a cover plate structure 010 and a shell, wherein a battery cell is disposed in the shell, and the cover plate body 100 is sealed and connected to the shell.

[0045] It can be understood that the electrolyte is injected into the battery through the injection hole on the cover structure 010 so that the electrolyte infiltrates the battery cell.

[0046] In this embodiment, the battery includes a cover structure 010 .

[0047] See Figure 6 A cover plate structure 010 proposed in this embodiment includes a cover plate body 100, a first sealing nail 300 and a sealing structure 200; the cover plate body 100 is provided with a first liquid injection hole 110 and a second liquid injection hole 120 that are connected, the first liquid injection hole 110 is arranged near the top of the cover plate body 100, and the second liquid injection hole 120 is arranged near the bottom of the cover plate body 100, and the first liquid injection hole 110 and the second liquid injection hole 120 form a first step surface 111; the first sealing nail 300 is sealed in the first liquid injection hole 110; the sealing structure 200 is sealed in the second liquid injection hole 120.

[0048] It is understood that the sealing structure 200 is provided to seal the first liquid injection hole 110 of the cover body 100. The sealing structure 200 is then inspected. If the sealing structure 200 is found to be poorly welded or its sealing performance does not meet product standards, the first sealing pin 300 is used to reseal the second liquid injection hole 120 of the cover body 100. This arrangement effectively improves the sealing quality of the sealing pins during the welding process, reduces the waste rate of batteries scrapped due to poor welding of the original sealing pins, reduces manufacturing costs, and improves rework efficiency.

[0049] See Figure 1 In this embodiment, the cover structure 010 includes a cover body 100 .

[0050] The cover body 100 is used for laser welding with the aluminum shell to wrap and fix the bare battery cell and achieve a sealing effect.

[0051] In this embodiment, the cover body 100 is a rectangular structure; see Figure 1The cover body 100 is provided with a first liquid injection hole 110 and a second liquid injection hole 120 that are connected. The first liquid injection hole 110 is arranged near the top of the cover body 100, and the second liquid injection hole 120 is arranged near the bottom of the cover body 100. The first liquid injection hole 110 and the second liquid injection hole 120 form a first step surface 111.

[0052] In this embodiment, the first liquid injection hole 110 is a circular hole, and the sidewall of the first liquid injection hole 110 is an inclined surface, so that the top hole diameter of the first liquid injection hole 110 gradually decreases from the top to the bottom.

[0053] Among them, the first liquid injection hole 110 is a reserved spare hole; it can be understood that when the second sealing nail 220 is detected to be poorly welded or the sealing does not meet the standard product, the first liquid injection hole 110 is used to set and weld the first sealing nail 300, and take additional remedial measures for the sealing nail welding process of the battery to make the battery seal test pass and reduce the battery scrap rate.

[0054] The first step surface 111 is used for welding with the bottom of the first sealing pin 300 .

[0055] In this embodiment, the first liquid injection hole 110 and the second liquid injection hole 120 are coaxially arranged.

[0056] In this example, see Figure 1 The second liquid injection hole 120 includes a first opening 121 and a second opening 122 arranged coaxially. The first opening 121 and the second opening 122 are both circular holes. The first opening 121 is arranged close to the bottom of the cover body 100, and the second opening 122 is arranged close to the second liquid injection hole 120; the first opening 121 and the second opening 122 form a second step surface 123.

[0057] Furthermore, the sidewall of the second opening 122 is an inclined surface, so that the top aperture of the second opening 122 gradually decreases from the top to the bottom.

[0058] Furthermore, the diameter of the second opening 122 is larger than that of the first opening 121 , and the diameter of the second liquid injection hole 120 is larger than that of the second opening 122 .

[0059] The first opening 121 is used to set the sealing nail 210, the second opening 122 is used to set the second sealing nail 220, and the second step surface 123 is used to be welded with the second sealing nail 220 of the sealing structure 200.

[0060] It is worth mentioning that the first opening 121, the second opening 122 and the first liquid injection hole 110 are all arranged along the vertical direction of the cover body 100. The length of the first opening 121 is greater than that of the second opening 122.

[0061] Furthermore, the cover body 100 is also connected to positive and negative poles, so that the positive and negative poles, the adapter and the battery cell tabs are welded and connected, thereby ensuring the function of conducting the charging and discharging current of the battery cell.

[0062] Furthermore, the cover body 100 is provided with an explosion-proof hole and an explosion-proof plate provided on the explosion-proof hole, so that when an abnormality occurs in the battery and the internal air pressure increases to a certain value, the explosion-proof plate is squeezed open and the pressure is released to reduce the risk of battery explosion.

[0063] See Figure 2 and Figure 3 In this embodiment, the sealing structure 200 includes a sealing structure 200 .

[0064] The sealing structure 200 is used to seal the second liquid injection hole 120 .

[0065] In this embodiment, the sealing structure 200 includes a sealing nail 210 and a second sealing nail 220 . The sealing nail is sealingly disposed in the first opening 121 , and the second sealing nail 220 is sealingly disposed in the second opening 122 .

[0066] Further, see Figure 2 The sealing nail 210 is a columnar structure, and the sealing nail 210 is interference fit in the first opening 121; a protrusion 211 is provided on the top of the sealing nail 210; the bottom outer edge of the sealing nail 210 is a bevel, so that the bottom of the sealing nail 210 forms a guide portion for guiding.

[0067] Among them, the sealing nail 210 is a structural component made of rubber material, PP+EPDM material, etc.

[0068] Further, see Figure 3 The second sealing pin 220 is cylindrical, and its outer wall is also inclined to match the inclined surfaces around the second opening 122. The height of the second sealing pin 220 is consistent with the coverage of the second opening 122; the top of the second sealing pin 220 is flush with the second opening 122, and the bottom of the second sealing pin 220 abuts and is welded to the second step surface 123.

[0069] The second sealing nail 220 has a second avoidance groove 221 at its bottom, and the top protrusion 211 of the sealing nail 210 is located in the first opening 121 and is accommodated in the second avoidance groove 221 to avoid mutual compression between the second sealing nail 220 and the sealing nail 210.

[0070] The second sealing pin 220 may be a metal structural member, such as an aluminum structural member, a stainless steel structural member, etc.

[0071] See Figure 4 In this embodiment, the cover plate structure 010 includes a first sealing pin 300 .

[0072] After the sealant nail 210 is assembled into an opening and the second sealant nail 220 is welded to the second stepped surface 123, the second sealant nail 220 of the sealing structure 200 is inspected. If the sealant structure 200 is found to be poorly welded or the sealing performance does not meet product standards, the first sealant nail 300 is used to reseal the first liquid injection hole 110 reserved on the cover body 100. It is understood that the first sealant nail 300 is used to repair the reserved first liquid injection hole 110, thereby reworking the sealing nail welding process.

[0073] In this example, see Figure 4 The top of the first sealing nail 300 is flush with the top surface of the cover body 100, and the bottom of the first sealing nail 300 is in contact with the first step surface 111 and welded together.

[0074] Furthermore, a first avoidance groove 310 is provided at the bottom of the first sealing pin 300 , and the aperture of the first avoidance groove 310 is larger than the aperture of the second sealing pin 220 of the sealing structure 200 .

[0075] The first sealing pin 300 may be a metal structural member, such as an aluminum structural member, a stainless steel structural member, etc.

[0076] The working principle and process of the cover plate structure 010 provided in the embodiment of the present invention are as follows:

[0077] See Figure 5 , the sealing nail 210 is interference-fitted into the first opening 121 , the second sealing nail 220 is fitted into the second opening 122 , and the bottom of the second sealing nail 220 is welded to the second step surface 123 .

[0078] The second sealing pin 220 of the sealing structure 200 is inspected. If it is detected that the sealing structure 200 is poorly welded or the sealing does not meet the standard product, the first liquid injection hole 110 reserved on the cover body 100 is repaired by welding with the first sealing pin 300 to repair the battery.

[0079] For details, see Figure 6 , the first sealing pin 300 is cooperatively arranged in the first liquid injection hole 110 , and the bottom of the first sealing pin 300 is welded to the first step surface 111 .

[0080] In summary, the cover plate structure 010 and the battery provided by the embodiment of the present invention reserve the first liquid injection hole 110 on the cover plate body 100, so that when the sealing structure 200 is detected to have poor welding or the sealing does not meet the standard product, the second liquid injection hole 120 of the cover plate body 100 can be repaired by the first sealing nail 300; this setting can effectively improve the sealing quality rate of the sealing nail in the welding process, reduce the waste rate of the original sealing nail due to poor welding causing the battery to be scrapped, reduce the manufacturing cost, and improve the rework efficiency.

[0081] Furthermore, by providing the first sealing member and the sealing structure 200 , it is possible to ensure that the liquid injection hole of each battery meets a high sealing standard, thereby improving the overall safety of the battery.

[0082] The above is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the present invention should be covered by the protection scope of the present invention.

Claims

1. A cover plate structure, characterized in that: include: a cover body, the cover body being provided with a first liquid injection hole and a second liquid injection hole in communication with each other, the first liquid injection hole being arranged near the top of the cover body, the second liquid injection hole being arranged near the bottom of the cover body, and the first liquid injection hole and the second liquid injection hole forming a first step surface; a first sealing pin, the first sealing pin being sealingly disposed in the first liquid injection hole; A sealing structure is sealed in the second liquid injection hole.

2. The cover plate structure according to claim 1, characterized in that: The second liquid injection hole includes a first opening and a second opening coaxially arranged, the first opening is arranged near the bottom of the cover body, and the second opening is arranged near the second liquid injection hole; The first opening and the second opening are formed with a second step surface.

3. The cover plate structure according to claim 2, characterized in that: The sealing structure includes a sealing nail and a second sealing nail. The sealing nail is sealingly arranged in the first opening, and the second sealing nail is sealingly arranged in the second opening.

4. The cover plate structure according to claim 3, characterized in that: The top of the second sealing pin is flush with the second opening, and the bottom of the second sealing pin abuts against and is welded to the second step surface.

5. The cover plate structure according to claim 4, characterized in that: A second avoidance groove is provided at the bottom of the second sealing nail, and the top of the sealing glue nail protrudes from the first opening and is accommodated in the second avoidance groove.

6. The cover plate structure according to claim 2, characterized in that: The aperture of the second opening is larger than that of the first opening, and the aperture of the second liquid injection hole is larger than that of the second opening; The side wall of the second opening is an inclined surface.

7. The cover plate structure according to claim 1, characterized in that: A first avoidance groove is provided at the bottom of the first sealing pin, and the aperture of the first avoidance groove is larger than the aperture of the second sealing pin of the sealing structure.

8. The cover plate structure according to claim 1, characterized in that: The top of the first sealing nail is flush with the top surface of the cover plate body, and the bottom of the first sealing nail abuts against the first step surface and is welded to it.

9. The cover plate structure according to claim 1, characterized in that: The first liquid injection hole and the second liquid injection hole are coaxially arranged; The inner wall of the first liquid injection hole is an inclined surface.

10. A battery, characterized in that: include: The cover plate structure according to any one of claims 1 to 9; A shell is provided with a battery cell, and the cover body is sealed and connected to the shell.

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