Liquid injection port sealing structure, battery cover plate and battery

Abstract

The utility model discloses a liquid injection port sealing structure, a battery cover plate and a battery, and relates to the technical field of battery repair. The liquid injection port sealing structure comprises a liquid injection port, a first sealing aluminum sheet, a notch groove and a second sealing aluminum sheet. The liquid injection port is of a hollow structure and is provided with an inner wall; the first sealing aluminum sheet is embedded in the liquid injection opening and is welded with the inner wall of the liquid injection opening to form a first welding area; the notch groove is concavely arranged in the first welding area; and the second sealing aluminum sheet is at least partially embedded in the notch groove and is respectively welded with the first sealing aluminum sheet, the liquid injection port and the notch groove. By adopting the technology provided by the utility model, the qualified rate of welding repair of the liquid injection port of the battery can be effectively improved, and the sealing reliability and durability of the liquid injection port are ensured.

Description

Technical Field

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

[0002] Aluminum shell sealing welding is a common process in the fields of battery manufacturing and packaging container production. In the battery field, the aluminum shell sealing welding process is to fill the sealing aluminum sheet into the aluminum sheet slot on the semi-finished battery cell cover for overfitting, and then weld them together for welding defect detection. However, in the above process flow, welding defect detection usually has a certain proportion of defective products.

[0003] Based on this, three main repair methods are currently used to solve the above-mentioned poorly welded batteries: (1) directly re-welding on the original weld. Although this method is simple and easy to operate, and has high efficiency, the re-repair pass rate is low; (2) replacing the sealing aluminum sheet and re-welding. The process flow is to dig a hole and fill it with a new aluminum sheet. Although this method has a high pass rate, the aluminum chips generated by the hole are not cleaned up and are easy to enter the battery cell, causing battery damage; (3) coating the original defective part with corrosion-resistant glue, but the reliability and durability of the glue bonding are difficult to cover the entire life cycle of the battery cell (5-10 years). Utility Model Content

[0004] The utility model provides a liquid filling port sealing structure, a battery cover plate and a battery, so as to solve the problem that the above-mentioned repair method is difficult to balance the qualified rate and the reliability.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is to provide a liquid injection port sealing structure, which includes: a liquid injection port, a first sealing aluminum sheet, a groove and a second sealing aluminum sheet.

[0006] The liquid injection port is a hollow structure and has an inner wall; the first sealing aluminum sheet is embedded in the liquid injection port and welded to the inner wall of the liquid injection port to form a first welding area; the groove is recessed in the first welding area; the second sealing aluminum sheet is at least partially embedded in the groove and is respectively welded to the first sealing aluminum sheet, the liquid injection port and the groove.

[0007] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0008] The liquid injection port can be effectively sealed by welding the first sealing aluminum sheet to the liquid injection port, wherein the first sealing aluminum sheet and the liquid injection port are welded to form a first welding area, wherein, when the welding is poor (for example, when there is a weld in the first welding area), a groove is added to the first welding area so that the second sealing aluminum sheet can be embedded in the groove to weld with each part and seal the weld. This effectively improves the welding yield rate, and compared with the current use of colloid as a repair sealing material, the above welding can ensure the sealing reliability and durability of the liquid injection port, and effectively improve the repair qualification rate.

[0009] Among them, the groove can be engraved by an engraving machine in the first welding area, so as to ensure that a relatively stable welding state is maintained between the first sealing aluminum sheet and the inner wall of the liquid injection port. The second sealing aluminum sheet serves as a secondary welding reinforcement component, which effectively avoids the phenomenon of aluminum chips falling into the battery cell.

[0010] In some embodiments, the groove is an annular groove, wherein the groove is circumferentially arranged between the inner wall of the liquid injection port and the first sealing aluminum sheet. Further, the second sealing aluminum sheet is an annular structure.

[0011] By adopting the above technical solution, an annular groove is set along the inside of the liquid injection port to effectively increase the welding area of ​​the secondary welding (welding of the second sealing aluminum sheet and various components). Accordingly, the second sealing aluminum sheet is also an annular structure and cooperates with the annular groove to realize secondary repair welding.

[0012] In some embodiments, the depth of the groove ranges from 0.30 mm to 0.45 mm; the thickness of the second sealing aluminum sheet ranges from 0.30 mm to 0.50 mm; and the width of the groove ranges from 0.50 mm to 1.20 mm.

[0013] By adopting the above technical solution, the conventional thickness of the first sealing aluminum sheet is 0.50mm, and the depth range of the groove is controlled between 0.30mm and 0.45mm, which can avoid piercing the first sealing aluminum sheet, and thus avoid the phenomenon of debris generated during the engraving process entering the battery cell. Among them, the thickness range of the second sealing aluminum sheet is 0.30mm to 0.50mm, that is, the size of the second sealing aluminum sheet matches the groove, so that filling the second sealing aluminum can facilitate subsequent laser welding.

[0014] In addition, since the width of the groove is usually in the range of 0.50mm to 1.20mm,

[0015] By adopting the above technical solution, the width of the weld is generally between 0.5 mm and 1.2 mm. Using a groove equivalent to the width of the weld can save the engraving process and subsequent welding process to the greatest extent.

[0016] In some embodiments, the second sealing aluminum sheet is embedded in the groove and has an interference fit with the groove.

[0017] By adopting the above technical solution, when the sizes of the second sealing aluminum sheet and the groove are comparable, an interference fit is adopted to ensure that the second sealing aluminum sheet will not fall off easily before welding.

[0018] In some embodiments, the groove is further provided with a step, wherein the second sealing aluminum sheet is embedded in the groove and abuts against the step.

[0019] By adopting the above technical solution, a step can also be provided to abut against the second sealing aluminum sheet so as to fix the second sealing aluminum sheet.

[0020] In a second aspect, the present application further provides a battery cover, comprising the above-mentioned liquid injection port sealing structure and a substrate, wherein the liquid injection hole is located on one side of the substrate along the extension direction of the substrate and penetrates the substrate.

[0021] In a third aspect, the present application also provides a battery, comprising the above-mentioned battery cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 creative work, among which:

[0023] Figure 1 It is a cross-sectional view of an embodiment of a liquid injection port sealing structure provided by the utility model;

[0024] Figure 2 It is a top view of an embodiment of a liquid injection port sealing structure provided by the utility model;

[0025] Figure 3 This is a cross-sectional view of an embodiment of a liquid injection port sealing structure provided by the utility model Figure 2 ;

[0026] Figure 4 It is a top view of an embodiment of a battery cover provided by the utility model;

[0027] Figure 5 It is a cross-sectional view of an embodiment of a battery cover provided by the utility model.

[0028] In the figure:

[0029] Liquid filling port—10; inner wall—11; first sealing aluminum sheet—20; notch—30; step—31; second sealing aluminum sheet—40; cover plate—50; positive electrode—51; negative electrode—52; explosion-proof valve—53. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0031] See also Figure 1 to Figure 2 As shown, Figure 1 A cross-sectional view of an embodiment of a liquid injection port sealing structure provided by the present application is shown; Figure 2 A top view of an embodiment of a liquid injection port sealing structure provided in the present application is shown.

[0032] In some embodiments, the liquid injection port sealing structure includes: a liquid injection port 10, a first sealing aluminum sheet 20, a groove 30, and a second sealing aluminum sheet 40. The liquid injection port 10 is a hollow structure and has an inner wall 11; the first sealing aluminum sheet 20 is embedded in the liquid injection port 10 and welded to the inner wall 11 of the liquid injection port 10 to form a first welding area; the groove 30 is recessed in the first welding area; the second sealing aluminum sheet 40 is at least partially embedded in the groove 30, and is welded to the first sealing aluminum sheet 20, the liquid injection port 10, and the groove 30, respectively.

[0033] In the embodiment of the present application, the first sealing aluminum sheet 20 is welded to the liquid injection port 10 to effectively seal the liquid injection port 10, wherein the first sealing aluminum sheet 20 and the liquid injection port 10 are welded to form a first welding area, wherein, when the welding is poor (for example, when there is a weld in the first welding area), a groove 30 is added to the first welding area, so that the second sealing aluminum sheet 40 can be embedded in the groove 30 to weld with each part and seal the weld. Thereby, the welding yield is effectively improved, and compared with the current use of colloid as a repair sealing material, the above welding can ensure the sealing reliability and durability of the liquid injection port 10.

[0034] Exemplarily, the inspection and maintenance process is as follows: 1) when the welding defect detection fails, use an engraving machine to engrave a groove 30 in the first welding area; 2) use dust removal equipment to remove aluminum chips generated by the engraving process of the engraving machine; 3) embed the second sealing aluminum sheet 40, and use laser welding to weld the second sealing aluminum sheet 40; 4) perform welding defect detection again (for example, helium inspection).

[0035] Among them, the groove 30 can be engraved by an engraving machine in the first welding area, so as to ensure that a relatively stable welding state is maintained between the first sealing aluminum sheet 20 and the inner wall 11 of the liquid injection port 10. The second sealing aluminum sheet 40 is used as a secondary welding reinforcement component, and has no through holes connected to the interior of the battery cell, so that the dust removal equipment (such as air blowing dust removal equipment, etc.) can effectively avoid the phenomenon of aluminum chips falling into the battery cell during dust removal.

[0036] In addition, the above structure is used to seal the liquid injection port 10, and the rework pass rate is high, and the processing equipment involved, such as an engraving machine, is not easily affected by the instability of manual operation.

[0037] In some embodiments, in combination Figure 2 As shown, the groove 30 is an annular groove, wherein the groove 30 is circumferentially arranged between the inner wall 11 of the liquid injection port 10 and the first sealing aluminum sheet 20. Further, the second sealing aluminum sheet 40 is an annular structure.

[0038] In the embodiment of the present application, an annular groove 30 is provided along the inside of the liquid injection port 10 to effectively increase the welding area of ​​the secondary welding (welding of the second sealing aluminum sheet 40 with various components). Accordingly, the second sealing aluminum sheet 40 is also an annular structure and cooperates with the annular groove 30 to realize the secondary repair welding. Exemplarily, the engraving machine housing adopts an XYZ model engraving machine.

[0039] In some embodiments, the depth of the groove 30 ranges from 0.30 mm to 0.45 mm; the thickness of the second sealing aluminum sheet 40 ranges from 0.30 mm to 0.50 mm; and the width of the groove 30 ranges from 0.50 mm to 1.20 mm.

[0040] In the embodiment of the present application, the conventional thickness of the first sealing aluminum sheet 20 is 0.50 mm, and the depth range of the groove 30 is controlled between 0.30 mm and 0.45 mm, which can avoid piercing the first sealing aluminum sheet 20, thereby preventing the debris generated during the engraving process from entering the battery cell. Among them, the thickness range of the second sealing aluminum sheet 40 is 0.30 mm to 0.50 mm, that is, the size of the second sealing aluminum sheet 40 matches the groove 30, so that filling the second sealing aluminum can facilitate subsequent laser welding.

[0041] In addition, because the width of the weld is usually between 0.5 mm and 1.2 mm, using a groove 30 that is equivalent to the width of the weld, that is, the width of the groove 30 ranges from 0.50 mm to 1.20 mm, can save the engraving process and subsequent welding process to the greatest extent.

[0042] For example, assuming that the thickness of the first sealing aluminum sheet 20 is 0.5 mm and the weld width is 0.8 mm, the depth of the groove 30 is set to 0.35 mm to 0.45 mm and the width is 0.75 mm to 0.85 mm. The wire diameter of the second sealing aluminum sheet 40 is 0.85 mm to 0.95 mm and the thickness is 0.35 mm to 0.45 mm.

[0043] In the embodiment of the present application, the second sealing aluminum sheet 40 is embedded in the groove 30 and has an interference fit with the groove 30. This ensures that the second sealing aluminum sheet 40 will not fall off easily before welding. For example, when the second sealing aluminum sheet 40 is embedded in the groove 30, it is not easy for the second sealing aluminum sheet 40 to fall out due to the flipping of the battery.

[0044] See also Figure 3 As shown, Figure 3 A cross-sectional view of an embodiment of a liquid injection port sealing structure provided by the present application is shown. Figure 2 .

[0045] In some embodiments, the groove 30 is further provided with a step 31 , wherein the second sealing aluminum sheet 40 is embedded in the groove 30 and abuts against the step 31 .

[0046] In the embodiment of the present application, a step 31 can be provided to abut against the second sealing aluminum sheet 40 to fix the second sealing aluminum sheet, so that the second sealing aluminum sheet 40 abuts against the step 31 to prevent the second sealing aluminum sheet 40 from falling out due to battery flipping.

[0047] See also Figures 4 to 5 As shown, Figure 4 A top view of an embodiment of a battery cover 50 provided by the present application is shown; Figure 5 A cross-sectional view of an embodiment of a battery cover plate 50 provided in the present application is shown.

[0048] In the second aspect, the present application further provides a battery cover 50, comprising the above-mentioned liquid injection port sealing structure and a substrate, wherein the liquid injection hole is located on one side of the substrate along the extension direction of the substrate and penetrates the substrate. Exemplarily, the battery cover 50 also includes a positive electrode 51, a negative electrode 52 and an explosion-proof valve 53, wherein the liquid injection port 10 is one or more, which is not limited in the present application, for example, one or two.

[0049] In a third aspect, the present application also provides a battery, comprising the above-mentioned battery cover 50.

[0050] The above description is only an implementation method of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present utility model, or directly or indirectly used in other related technical fields, should be included in the protection scope of the present utility model.

Claims

1. A liquid injection port sealing structure, characterized in that: include: A liquid injection port, the liquid injection port is a hollow structure and has an inner wall; A first sealing aluminum sheet, wherein the first sealing aluminum sheet is embedded in the liquid injection port and welded to the inner wall of the liquid injection port to form a first welding area; A groove, wherein the groove is concavely arranged in the first welding area; The second sealing aluminum sheet is at least partially embedded in the groove and is respectively welded to the first sealing aluminum sheet, the liquid injection port and the groove.

2. The liquid injection port sealing structure according to claim 1, characterized in that: The groove is an annular groove, wherein the groove is circumferentially arranged between the inner wall of the liquid injection port and the first sealing aluminum sheet.

3. The liquid injection port sealing structure according to claim 2, characterized in that: The second sealing aluminum sheet is a ring-shaped structure.

4. The liquid injection port sealing structure according to claim 1, characterized in that: The depth of the groove ranges from 0.30 mm to 0.45 mm.

5. The liquid injection port sealing structure according to claim 1, characterized in that: The thickness of the second sealing aluminum sheet ranges from 0.30 mm to 0.50 mm.

6. The liquid injection port sealing structure according to claim 1, characterized in that: The width of the groove ranges from 0.50 mm to 1.20 mm.

7. The liquid injection port sealing structure according to claim 1, characterized in that: The second sealing aluminum sheet is embedded in the groove and has an interference fit with the groove.

8. The liquid injection port sealing structure according to claim 1, characterized in that: The groove is also provided with a step, wherein the second sealing aluminum sheet is embedded in the groove and abuts against the step.

9. A battery cover, characterized in that: The liquid injection port sealing structure comprises the liquid injection port sealing structure according to any one of claims 1 to 8, and further comprises a substrate, wherein the liquid injection hole is located on one side of the substrate along the extension direction of the substrate and penetrates the substrate.

10. A battery, characterized in that: Including the battery cover plate as claimed in claim 9.

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