Integrated automatic rebound type sealant nail and secondary battery

Abstract

The application provides an integrated automatic rebound type sealing glue nail and a secondary battery, and relates to the technical field of lithium batteries.The integrated automatic rebound type sealing glue nail comprises a glue nail body, the glue nail body comprises a column body sealing section, a spiral groove is arranged on the peripheral side of the column body sealing section, the upper end of the spiral groove is communicated with the first clamping groove, and the other end extends to the outside of the column body sealing section.The integrated automatic rebound type sealing glue nail provided by the application is provided with spring sheets between the sealing cover plate and the glue nail body.In the helium detection, the spring sheets are moved upward by the electromagnetic chuck, and then the glue nail body is moved upward.Because the spiral groove is arranged on the glue nail body, the helium can flow to the upper side of the glue nail body through the spiral groove.When the sealing cover plate is poorly welded, the helium can be leaked, so that whether the sealing cover plate is qualified can be judged by detecting the amount of helium.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to an integrated automatic rebound sealing nail and a secondary battery thereof. Background Art

[0002] The existing method of sealing the injection hole is to pre-install a sealing nail into the injection hole after the secondary injection of the battery is completed, then draw negative pressure inside the secondary battery and fill it with helium, press the sealing nail to a position flush with the injection hole, and then weld a sealing aluminum nail to the injection hole to achieve the sealing of the injection hole.

[0003] Because the existing sealing nails have an interference fit with the injection hole, the helium gas filled into the battery casing cannot escape. Even if there are problems with the laser welding of the sealing aluminum nails, the helium inspection equipment will still determine that the problematic battery is qualified. Because the sealing nails are primarily made of plastic, they may deform or shift during lithium-ion battery capacity adjustment and subsequent use, thus failing to achieve a good seal. If the external sealing aluminum nails are not welded properly, adverse consequences such as battery cell leakage can occur. Furthermore, as the sealing nails age, there is a risk that they may fall into the battery cell. Summary of the Invention

[0004] The purpose of the present invention is to provide an integrated automatic rebound sealing nail and a secondary battery thereof, so as to solve the technical problems that the sealing effect of the current nail inserted into the liquid injection hole will cause helium to be unable to be discharged, even if a sealing abnormality occurs, the abnormality cannot be detected, and when the sealing nail ages, there is a risk of the sealing nail falling into the inside of the battery cell.

[0005] The present invention provides an integrated automatic rebound sealing nail, comprising a sealing cover plate, a spring sheet and a nail body; the sealing cover plate, the spring sheet and the nail body cooperate to form an integrated structure;

[0006] A first mounting groove is provided on the lower end surface of the sealing cover plate; the spring piece is assembled in the first mounting groove, and the outer edge of the spring piece is connected to the sealing cover plate; a first clamping groove is provided on the outer circumference of the glue nail body, and the inner ring of the spring piece is clamped in the first clamping groove;

[0007] The main body of the nail comprises a cylindrical sealing section, which is used for interference fitting in the liquid injection hole and sealing the liquid injection hole;

[0008] A spiral groove is provided on the circumferential side of the column sealing section, and the upper end of the spiral groove is communicated with the first clamping groove, and the other end extends outside the column sealing section.

[0009] In an optional embodiment, the glue nail body further comprises an insertion section, which is arranged at the lower end of the column sealing section; the outer diameter of the insertion section is smaller than the inner diameter of the liquid injection hole.

[0010] In an optional embodiment, a first buffer groove is arranged in the first mounting groove, and the inner diameter of the first buffer groove is smaller than the inner diameter of the first mounting groove, and the inner diameter of the first buffer groove is greater than the outer diameter of the glue nail body.

[0011] In an optional embodiment, an elastic groove is arranged on the side of the glue nail body facing the sealing cover plate, at least one elastic member is arranged in the elastic groove, and one end of the elastic member abuts against the elastic groove and the other end abuts against the sealing cover plate.

[0012] In an optional embodiment, the elastic member is a spring.

[0013] In an optional embodiment, a guide column is arranged on the side of the sealing cover plate facing the glue nail body, and one end of the elastic member is sleeved on the guide column.

[0014] In an optional embodiment, the spring sheet comprises a ring-shaped plate, elastic sheets and a magnetic attraction part; a plurality of elastic sheets are arranged on the inner circle of the ring-shaped plate, one end of the elastic sheet is connected to the ring-shaped plate, the other end is provided with the magnetic attraction part, and the magnetic attraction part is arranged on the side of the elastic sheet abutting against the first clamping groove.

[0015] In an optional embodiment, the material of the magnetic attraction part is a magnetic material.

[0016] Or the magnetic attraction part is a non-magnetic material, and the magnetic material is sprayed on the magnetic attraction part.

[0017] In an optional embodiment, the glue nail body further comprises an insertion section and a guide section, the insertion section is arranged at the lower end of the column sealing section; the outer diameter of the insertion section is equal to the inner diameter of the liquid injection hole, and one or more flat parts are arranged in the circumferential direction of the insertion section.

[0018] The guide section is connected to the end of the insertion section away from the sealing section, and the diameter of the guide section gradually decreases in the direction away from the insertion section.

[0019] The sealing cover plate and the glue nail body of the integrated automatic rebound type sealing glue nail are provided with spring sheets, when helium detection is carried out, the spring sheets are moved upward by the electromagnetic chuck, and then the glue nail body is moved upward, because the glue nail body is provided with a spiral groove, helium can flow to the upper side of the glue nail body through the spiral groove, when the sealing cover plate is poorly welded, helium can be leaked, so that whether the welding of the sealing cover plate is qualified can be judged by detecting the amount of helium; after the electromagnetic chuck is removed, the glue nail body is reset under the action of the spring sheet, so that the glue nail body seals the liquid injection hole and keeps the sealing state;

[0020] The glue nail body and the sealing cover plate form an integrated structure through the spring sheet, so that the glue nail body can be prevented from falling into the liquid injection hole, and the risk of the glue nail body entering the secondary battery is avoided.

[0021] The application provides a secondary battery which uses the integrated automatic rebound type sealing glue nail and realizes effective sealing of the secondary battery.

[0022] Compared with the prior art, the secondary battery provided by the application has the integrated automatic rebound type sealing glue nail provided by the application, and has all the beneficial effects of the integrated automatic rebound type sealing glue nail provided by the application. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0024] Figure 1 The structure schematic view of the integrated automatic rebound type sealing glue nail provided by the embodiment of the application is shown in the figure.

[0025] Figure 2 The structure schematic view of the integrated automatic rebound type sealing glue nail provided by the embodiment of the application is shown in the figure. Figure 1 The structure schematic view of the integrated automatic rebound type sealing glue nail provided by the embodiment of the application is shown in the figure.

[0026] Figure 3 The structure schematic view of the integrated automatic rebound type sealing glue nail provided by the embodiment of the application is shown in the figure. Figure 2 The structure schematic view of the integrated automatic rebound type sealing glue nail provided by the embodiment of the application is shown in the figure.

[0027] Figure 4 The structure schematic view of the integrated automatic rebound type sealing glue nail provided by the embodiment of the application is shown in the figure. Figure 3 The structure schematic view of the integrated automatic rebound type sealing glue nail provided by the embodiment of the application is shown in the figure.

[0028] Figure 5 As shown in the structure diagram of the spring sheet of the one-piece automatic rebound type sealant nail; Figure 1

[0029] Figure 6 As shown in the structure diagram of the spring sheet of the one-piece automatic rebound type sealant nail; Figure 5

[0030] Figure 7 As shown in the structure diagram of the spring sheet of the one-piece automatic rebound type sealant nail; Figure 1

[0031] Icon: 100 - seal cover plate; 101 - guide column; 102 - first mounting groove; 103 - first buffer groove; 200 - nail body; 201 - elastic groove; 202 - column seal section; 203 - insertion section; 204 - guide section; 205 - first clamping groove; 206 - spiral groove; 207 - flat section; 300 - spring sheet; 301 - magnetic attraction part; 302 - elastic sheet; 303 - annular plate; 400 - elastic member. DETAILED DESCRIPTION

[0032] The terms "first", "second", "third", etc. are only used for differentiation and description, and do not represent the arrangement sequence number, and cannot be understood as indicating or implying relative importance.

[0033] In addition, the terms "horizontal", "vertical", "overhanging", etc. do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0034] In the description of the present application, it should be noted that the terms "inner", "outer", "left", "right", "upper", "lower", etc. indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] In the description of the present application, unless otherwise explicitly specified and limited, the terms "set", "mounted", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements.

[0036] The technical solutions of the present application will be described clearly and completely in conjunction with the drawings.​​​

[0037] Embodiment

[0038] With reference to Figures 1-7 The present application provides a one-piece automatic rebound sealing glue nail, comprising a sealing cover plate 100, a spring sheet 300 and a glue nail body 200; the sealing cover plate 100, the spring sheet 300 and the glue nail body 200 cooperate to form a one-piece structure.

[0039] A first mounting groove 102 is arranged at the lower end surface of the sealing cover plate 100; the spring sheet 300 is assembled in the first mounting groove 102, and the edge of the outer periphery of the spring sheet 300 is connected with the sealing cover plate 100; a first clamping groove 205 is arranged on the outer side of the glue nail body 200, and the inner ring of the spring sheet 300 is clamped in the first clamping groove 205.

[0040] The glue nail body 200 comprises a cylindrical sealing section 202, which is used for interference assembly in the liquid injection hole and sealing the liquid injection hole.

[0041] A spiral groove 206 is arranged on the lateral side of the cylindrical sealing section 202, and the upper end of the spiral groove 206 is in communication with the first clamping groove 205, and the other end extends out of the cylindrical sealing section 202.

[0042] In some embodiments, the material of the sealing cover plate 100 of the one-piece automatic rebound sealing glue nail is generally aluminum, and the material of the glue nail body 200 is plastic, which can also be other materials; the outer ring of the spring sheet 300 is welded in the first mounting groove 102 on the sealing cover plate 100, and the inner ring of the spring sheet 300 is clamped in the first clamping groove 205.

[0043] A spiral groove 206 is arranged on the lateral side of the glue nail body 200, and the upper end of the spiral groove 206 is arranged at the lower end of the first clamping groove 205, and the other end extends out of the cylindrical sealing section 202; in this way, when helium detection is performed, the spring sheet 300 can be attracted and moved upward by using an electromagnetic chuck, which can drive the lower part of the glue nail body 200 to move upward, and the helium gas in the battery can flow to the upper end of the glue nail body 200 through the spiral groove 206; then, whether the welding of the sealing cover plate 100 and the battery cover plate is qualified is determined by detecting the amount of helium gas; in this way, it is avoided that the sealing of the liquid injection hole by the glue nail body 200 leads to that whether the welding of the sealing cover plate 100 and the battery cover plate is qualified cannot be determined when helium detection is performed.

[0044] When the helium detection is completed, the electromagnetic chuck is removed, the glue nail body 200 is reset under the action of the spring sheet 300, the glue nail body 200 seals the liquid injection hole; the one-piece automatic rebound type sealing glue nail has a rebound effect, the sealing section seals the liquid injection hole, and the sealing of the liquid injection hole is realized, so that the welding condition of the external sealing cover plate 100 can be detected, and it is ensured that the secondary battery is in a sealed state.

[0045] The glue nail body 200 and the sealing cover plate 100 form an integrated structure through the spring sheet 300, so that the glue nail body 200 can be prevented from falling into the liquid injection hole, and the risk of the glue nail body 200 entering the secondary battery is avoided.

[0046] Referring to Figure 3 In an optional embodiment, the glue nail body 200 further comprises an insertion section 203, which is arranged at the lower end of the column sealing section 202; the outer diameter of the insertion section 203 is smaller than the inner diameter of the liquid injection hole.

[0047] In some embodiments, the glue nail body 200 further has an insertion section 203, which has a diameter smaller than that of the column sealing section 202 and smaller than the inner diameter of the liquid injection hole; that is, when the column sealing section 202 moves upward, helium can flow from the gap between the insertion section 203 and the hole wall of the liquid injection hole.

[0048] When the spring sheet 300 makes the column sealing section 202 rise by a distance, helium can flow upward from the liquid injection hole, and in the case that the sealing cover plate 100 is not welded well, helium can leak, so that it can be ensured that whether the sealing cover plate 100 is welded well can be judged by detecting the amount of helium.

[0049] Referring to Figure 3 and Figure 4 In an optional embodiment, the first mounting groove 102 is provided with a first buffer groove 103, the inner diameter of the first buffer groove 103 is smaller than the inner diameter of the first mounting groove 102, and the inner diameter of the first buffer groove 103 is greater than the outer diameter of the glue nail body 200.

[0050] In an optional embodiment, the side of the glue nail body 200 facing the sealing cover plate 100 is provided with an elastic groove 201, an elastic member 400 is arranged in the elastic groove 201, one end of the elastic member 400 abuts against the elastic groove 201, and the other end abuts against the sealing cover plate 100.

[0051] In an optional embodiment, the elastic member 400 is a spring.

[0052] The elastic groove 201 is arranged on the upper end surface of the glue nail body 200, and the elastic member 400 arranged in the elastic groove 201 is generally a spring. One end of the spring is in abutment with the elastic groove 201 of the glue nail body 200, and the other end is in abutment with the sealing cover plate 100. When the electromagnetic chuck moves upward with the spring sheet 300, the spring is in a compressed state. After the electromagnetic chuck is removed, the spring releases the pressure, and the glue nail body 200 moves away from the sealing cover plate 100, that is, the glue nail body 200 is reset, so that the glue nail body 200 reseals the liquid injection hole.

[0053] With reference to Figure 3 In an optional embodiment, a guide column 101 is arranged on the side of the sealing cover plate 100 facing the glue nail body 200, and one end of the elastic member 400 is sleeved on the guide column 101.

[0054] In some embodiments, a first buffer groove 103 is arranged on the side of the sealing cover plate 100 facing the glue nail body 200, a guide column 101 is arranged in the first buffer groove 103, the elastic member 400 is a spring, and one end of the spring is sleeved on the guide column 101. When the spring is extruded, the guide column 101 can play a guiding role, so that the spring can be smoothly compressed and reset.

[0055] With reference to Figure 5 and Figure 6 In an optional embodiment, the spring sheet 300 comprises a ring-shaped plate 303, an elastic sheet 302, and a magnetic attraction part 301. A plurality of elastic sheets 302 are arranged on the inner ring of the ring-shaped plate 303. One end of the elastic sheet 302 is connected with the ring-shaped plate 303, and the other end is provided with the magnetic attraction part 301. The magnetic attraction part 301 is arranged on the side of the elastic sheet 302 in abutment with the first clamping groove 205.

[0056] A first buffer groove 103 is arranged in the first mounting groove 102. When the glue nail body 200 moves up and down under the action of the spring sheet 300, the first buffer groove 103 arranged in the first mounting groove 102 can accommodate the movement of the glue nail body 200.

[0057] Generally, the first buffer groove 103, the first mounting groove 102, the spring sheet 300, and the glue nail body 200 are concentrically arranged. A plurality of elastic sheets 302 are arranged on the ring-shaped plate 303 of the spring sheet 300, and adjacent elastic sheets 302 are fixedly spaced.

[0058] The magnetic attraction part 301 is arranged on the elastic sheet 302 and is arranged on the side of the elastic sheet 302 facing the sealing cover plate 100. When the electromagnetic chuck magnetically attracts the magnetic attraction part 301, the magnetic attraction part 301 is located in the first clamping groove 205, and when the magnetic attraction part 301 moves towards the electromagnetic chuck, the glue nail body 200 moves towards the sealing cover plate 100, so that the helical groove 206 can guide the helium in the battery to the lower end of the sealing cover plate 100. In this way, during helium detection, the amount of helium can be detected to determine whether the sealing cover plate 100 is welded qualified. When the helium detection is completed, the electromagnetic chuck is removed, the magnetic attraction part 301 loses the external force, the elastic sheet 302 moves the magnetic attraction part 301 downward, and then the glue nail body 200 moves downward, and then the glue nail body 200 seals the liquid injection hole. At this time, the helical groove 206 is located in the liquid injection hole, and the helium cannot move upward through the liquid injection hole.

[0059] The spring sheet 300 is in a natural state at this time. When the electromagnetic chuck attracts the magnetic attraction part 301, the elastic sheet 302 is in a bent state. When the electromagnetic chuck is removed, the elastic sheet 302 returns to the natural state, and then the glue nail body 200 moves towards the liquid injection hole.

[0060] The spring sheet 300 can also avoid the problem of the glue nail body 200 falling into the battery due to aging and other reasons. When the glue nail body 200 moves towards the battery, the elastic force of the elastic sheet 302 needs to be overcome, and then the glue nail body 200 is not easy to fall into the battery.

[0061] In an optional embodiment, the material of the magnetic attraction part 301 is a magnetic material.

[0062] Alternatively, the magnetic attraction part 301 is a non-magnetic material, and a magnetic material is sprayed on the magnetic attraction part 301.

[0063] The material of the magnetic attraction part 301 of the spring sheet 300 is the same as that of the spring sheet 300, for example, the material of the magnetic attraction part 301 is a magnetic material.

[0064] In order to ensure the strength of the spring sheet 300, the spring sheet 300 is generally integrally formed, and the thickness of the magnetic attraction part 301 is thicker than other positions of the spring sheet 300, so that the electromagnetic chuck can move the magnetic attraction part 301 towards the electromagnetic chuck.

[0065] The annular plate 303 of the spring sheet 300 is welded to the sealing cover plate 100, so that the spring sheet 300 is firmly connected to the sealing cover plate 100, and the spring sheet 300 is not easy to separate from the sealing cover plate 100.

[0066] When the magnetic attraction part 301 is a non-magnetic material, a magnetic material is sprayed on the magnetic attraction part 301, so that the magnetism of the whole magnetic attraction part 301 is increased, the electromagnetic chuck can attract the magnetic attraction part 301, and the spring sheet 300 drives the glue nail body 200 to move.

[0067] Referring to Figure 7 In optional embodiments, the glue nail body 200 further comprises an insertion section 203 and a guide section 204, the insertion section 203 is arranged at the lower end of the column sealing section 202; the outer diameter of the insertion section 203 is equal to the inner diameter of the liquid injection hole, and one or more flat sections 207 are arranged on the circumference of the insertion section 203.

[0068] The guide section 204 is connected to the end of the insertion section 203 away from the sealing section, and the diameter of the guide section 204 gradually decreases in the direction away from the insertion section 203.

[0069] The glue nail body 200 further comprises an insertion section 203 and a guide section 204, the column sealing section 202, the insertion section 203 and the guide section 204 of the glue nail body 200 are arranged in sequence, the diameter of the column sealing section 202 is greater than the inner diameter of the liquid injection hole, the column sealing section 202 is assembled with the liquid injection hole in an interference fit, the diameter of the insertion section 203 is equal to the inner diameter of the liquid injection hole, and generally a plurality of flat sections 207 are arranged on the circumference of the insertion section 203; the guide section 204 is generally inverted conical, so that the glue nail body 200 is conveniently inserted into the liquid injection hole.

[0070] The present application provides a kind of secondary battery, secondary battery, using the integrated automatic rebound type sealing glue nail of any one of the foregoing embodiments, the effective sealing of secondary battery is realized.

[0071] Compared with the prior art, the secondary battery provided by the present application has the integrated automatic rebound type sealing glue nail provided by the present application, thereby having all the beneficial effects of the integrated automatic rebound type sealing glue nail provided by the present application.

[0072] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An integrated automatic rebound sealing nail, characterized in that: It comprises a sealing cover plate (100), a spring sheet (300) and a glue nail body (200); the sealing cover plate (100), the spring sheet (300) and the glue nail body (200) cooperate to form an integrated structure; A first mounting groove (102) is provided on the lower end surface of the sealing cover plate (100); the spring sheet (300) is assembled in the first mounting groove (102), and the outer peripheral edge of the spring sheet (300) is connected to the sealing cover plate (100); a first clamping groove (205) is provided on the outer circumference of the glue nail body (200), and the inner ring of the spring sheet (300) is clamped in the first clamping groove (205); The glue nail body (200) comprises a cylindrical sealing section (202), and the cylindrical sealing section (202) is used for interference fitting in the liquid injection hole and sealing the liquid injection hole; A spiral groove (206) is provided on the circumferential side of the column sealing section (202), and the upper end of the spiral groove (206) is communicated with the first clamping groove (205), and the other end extends outside the column sealing section (202).

2. The integrated automatic rebound sealing nail according to claim 1, characterized in that: The nail body (200) further comprises an insertion section (203), which is arranged at the lower end of the column sealing section (202); the outer diameter of the insertion section (203) is smaller than the inner diameter of the injection hole.

3. The integrated automatic rebound sealing nail according to claim 1, characterized in that: A first buffer groove (103) is provided in the first installation groove (102), and the inner diameter of the first buffer groove (103) is smaller than the inner diameter of the first installation groove (102), and the inner diameter of the first buffer groove (103) is larger than the outer diameter of the glue nail body (200).

4. The integrated automatic rebound sealing nail according to claim 3, characterized in that: An elastic groove (201) is provided on one side of the glue nail body (200) facing the sealing cover plate (100), at least one elastic member (400) is provided in the elastic groove (201), and one end of the elastic member (400) abuts against the elastic groove (201), and the other end abuts against the sealing cover plate (100).

5. The integrated automatic rebound sealing nail according to claim 4, characterized in that: The elastic member (400) is a spring.

6. The integrated automatic rebound sealing nail according to claim 5, characterized in that: A guide post (101) is provided on one side of the sealing cover plate (100) facing the glue nail body (200), and one end of the elastic member (400) is sleeved on the guide post (101).

7. The integrated automatic rebound sealing nail according to claim 1, characterized in that: The spring sheet (300) comprises an annular plate (303), an elastic sheet (302) and a magnetic attraction portion (301); a plurality of the elastic sheets (302) are provided on the inner ring of the annular plate (303); one end of the elastic sheet (302) is connected to the annular plate (303), and the other end is provided with the magnetic attraction portion (301), and the magnetic attraction portion (301) is provided on the side where the elastic sheet (302) abuts against the first clamping groove (205).

8. The integrated automatic rebound sealing nail according to claim 7, characterized in that: The material of the magnetic attraction portion (301) is a magnetic material; Alternatively, the magnetic attraction portion (301) is made of non-magnetic material, and a magnetic material is sprayed on the magnetic attraction portion (301).

9. The integrated automatic rebound sealing nail according to claim 1, characterized in that: The nail body (200) further comprises an insertion section (203) and a guide section (204), wherein the insertion section (203) is arranged at the lower end of the cylindrical sealing section (202); the outer diameter of the insertion section (203) is equal to the inner diameter of the injection hole, and one or more plane portions (207) are arranged in the circumferential direction of the insertion section (203); The guide section (204) is connected to an end of the insertion section (203) away from the sealing section, and the diameter of the guide section (204) gradually decreases in a direction away from the insertion section (203).

10. A secondary battery, characterized in that: By using the integrated automatic rebound sealing nail described in any one of claims 1 to 9, effective sealing of the secondary battery is achieved.

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