Pole mounting and sealing structure of cylindrical battery

Abstract

The utility model relates to a pole mounting and sealing structure of a cylindrical battery, the cylindrical battery comprises a naked battery cell, a positive pole collector plate and a positive pole, the positive pole collector plate is arranged at the positive pole end of the naked battery cell, the positive pole is arranged on the positive pole collector plate, a crimping boss is arranged on the side surface of the positive pole, and the crimping boss is arranged on the side surface of the positive pole. A stepped pole through hole is formed in the positive pole, and the positive pole is welded with the positive collector plate through the pole through hole; the injection molding structure of the pole mounting and sealing structure comprises nano injection molding plastic, an insulating rubber sleeve and a steel cover, the insulating rubber sleeve sleeves the end part of the naked battery cell, is tightly pressed above the positive electrode collector plate and is positioned below the crimping boss, the steel cover is tightly pressed above the insulating rubber sleeve, a positive electrode avoiding inner hole is formed in the steel cover, and a negative electrode avoiding inner hole is formed in the steel cover. The positive pole column is located in the positive pole avoiding inner hole, the steel cover is provided with a sealing pressing edge at the edge of the positive pole avoiding inner hole, and the nanometer injection molding plastic wraps the sealing pressing edge and is pressed on the crimping boss of the positive pole column.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium-ion batteries, and particularly relates to a pole column installation and sealing structure of a cylindrical battery. Background Art

[0002] With the popularization of mobile devices, electric vehicles and energy storage systems, lithium-ion batteries, as a battery system with high energy density and light weight, are widely used. Among them, cylindrical batteries are one of the most commonly used lithium-ion batteries. A typical pole column sealing structure of a cylindrical battery includes: upper plastic on the positive electrode, lower plastic on the positive electrode, steel shell, insulating tape, stainless steel fixing piece and other loose parts. The connection method of its structure is as follows: the positive electrode current collector plate is arranged above the bare battery cell, an insulating tape is arranged between the positive electrode current collector plate and the bare battery cell, the lower plastic on the positive electrode is pressed on the positive electrode current collector plate, the steel shell is pressed on the lower plastic on the positive electrode. At the same time, the positive electrode column is arranged above the positive electrode current collector plate, upper plastic on the positive electrode is arranged at the connection part between the positive electrode column and the positive electrode current collector plate, the upper plastic on the positive electrode is pressed on the steel shell, and a stainless steel fixing piece is arranged on the upper plastic on the positive electrode. The specific connection is as shown in Attachment Figure 5 and Attachment Figure 6 As shown. In summary, the existing sealing pole column structure of cylindrical batteries usually assembles the above-mentioned loose parts first, through the layer-by-layer pressing between various loose parts, and then uses a sealing ring for compression to complete the sealing of the pole column part of the cylindrical battery. However, since various traditional sealing loose parts each achieve their own functions, there are many parts and the assembly is cumbersome and complex. At the same time, since the sealing ring that controls the seal by the compression amount is restricted by the characteristics of its own product, the sealing effect is poor and the service life is extremely limited. Content of the Utility Model

[0003] In view of the defects of the above-mentioned prior art, the technical problem to be solved by the utility model is to provide a pole column installation and sealing structure of a cylindrical battery, which simplifies the structural design of pole column installation and sealing and improves the sealing effect and service life of the pole column by means of nano-injection molding.

[0004] To achieve the above object, the present utility model provides a pole installation and sealing structure for a cylindrical battery. The cylindrical battery includes a bare battery cell, a positive current collector plate, and a positive pole. The positive current collector plate is disposed at the positive end of the bare battery cell, the positive pole is disposed on the positive current collector plate, a crimping boss is provided on the side surface of the positive pole, a stepped pole through hole is formed inside the positive pole, and the positive pole is welded to the positive current collector plate through the pole through hole; the pole installation and sealing structure injection molding structure includes nano-injection molded plastic, an insulating rubber sleeve, and a steel cover. The insulating rubber sleeve is sleeved on the end of the bare battery cell and pressed above the positive current collector plate and below the crimping boss. The steel cover is pressed above the insulating rubber sleeve. A positive pole avoidance inner hole is provided in the steel cover, the positive pole is located in the positive pole avoidance inner hole, a sealing press edge is provided at the edge of the positive pole avoidance inner hole in the steel cover, and the nano-injection molded plastic is coated on the sealing press edge and pressed on the crimping boss of the positive pole.

[0005] Further, a stepped pole through hole is formed inside the positive pole, and a positive pole sealing assembly is further included. The positive pole sealing structure of the positive pole sealing assembly includes a sealing cover and a sealing glue nail. The sealing glue nail is disposed in the stepped pole through hole of the positive pole and presses the welding joint between the positive pole and the positive current collector plate. The sealing cover is disposed in the stepped pole through hole of the positive pole and presses the sealing glue nail.

[0006] Further, a sealing cylindrical surface is provided on the side surface of the positive pole above the crimping boss, and the nano-injection molded plastic is in close contact with the sealing cylindrical surface.

[0007] Further, the crimping boss of the positive pole is pressed on the positive current collector plate.

[0008] Further, a sealing cylindrical surface is provided on the side surface of the positive pole above the crimping boss, and the nano-injection molded plastic is in close contact with the sealing cylindrical surface.

[0009] Further, the crimping boss of the positive pole is a ring-shaped structure.

[0010] Further, the sealing press edge of the steel cover is a ring-shaped structure.

[0011] Further, a plurality of press edge notches are provided along the circumferential direction on the sealing press edge of the steel cover.

[0012] Further, the insulating rubber sleeve is made of natural rubber.

[0013] As described above, the pole installation and sealing structure of the cylindrical battery involved in the present utility model has the following beneficial effects:

[0014] 1. By setting a sealing bead on the steel cover and a crimping boss on the positive electrode post, the structure of the sealed electrode post is greatly simplified, which can significantly reduce the use of related consumables, lower the usage cost, and is conducive to assembly, production, and manufacturing, and can improve the stability of the electrode post installation and sealing structure.

[0015] 2. By setting nano-injected plastic, the bonding force between the plastic and the metal is improved by using nano-molecules, enabling a dense bond between the steel cover and the positive electrode post, greatly enhancing the strength and sealing effect of the positive electrode post. It can not only integrate the functions of various traditional loose parts for sealing but also have insulation characteristics and a better sealing effect, with a longer service life. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the electrode post installation and sealing structure of the cylindrical battery in the present utility model.

[0017] Figure 2 This is Figure 1 An enlarged view at A.

[0018] Figure 3 It is a schematic structural diagram of the electrode post, nano-injected plastic, and steel cover in the present utility model.

[0019] Figure 4 It is a schematic structural diagram of the steel cover in the present utility model.

[0020] Figure 5 It is a schematic structural diagram of a typical electrode post sealing structure in the prior art.

[0021] Figure 6 This is Figure 5 An enlarged view at B.

[0022] Explanation of the Reference Numerals in the Drawings

[0023] 1 Bare battery cell

[0024] 2 Positive electrode post

[0025] 201 Crimping boss

[0026] 202 Electrode post through-hole

[0027] 3 Nano-injected plastic

[0028] 4 Steel cover

[0029] 401 Positive electrode avoidance inner hole

[0030] 402 Sealing bead

[0031] 403 Bead notch

[0032] 5 Positive electrode current collector plate

[0033] 6 Positive terminal sealing assembly

[0034] 601 Sealing cover

[0035] 602 Sealing adhesive nail

[0036] 7 Insulating rubber sleeve

[0037] 8 Upper plastic for positive electrode

[0038] 9 Steel shell

[0039] 10 Lower plastic for positive electrode

[0040] 11 Insulating tape

[0041] 12 Stainless steel fixing piece Detailed implementation manners

[0042] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

[0043] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limited conditions under which the present utility model can be implemented. Therefore, they do not have substantial technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of narration and are not used to limit the scope under which the present utility model can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present utility model can be implemented.

[0044] See Figures 1 to 4, the present utility model provides a pole installation and sealing structure for a cylindrical battery. The cylindrical battery includes a bare battery cell 1, a positive current collector plate 5, and a positive pole 2. The positive current collector plate 5 is arranged at the positive end of the bare battery cell 1, the positive pole 2 is arranged on the positive current collector plate 5, and a crimping boss 201 is arranged on the side surface of the positive pole 2. The pole installation and sealing structure is used for the installation, fixation, and sealing of the positive pole 2 and the positive current collector plate 5, and includes a nano-injected plastic 3, an insulating rubber sleeve 7, and a steel cover 4. The insulating rubber sleeve 7 is sleeved on the end of the bare battery cell 1 and pressed above the positive current collector plate 5 and below the crimping boss 201. The steel cover 4 is pressed above the insulating rubber sleeve 7. A positive pole avoidance inner hole 401 is arranged in the steel cover 4, and the positive pole avoidance inner hole 401 and the steel cover 4 have the same center of the circle. The positive pole 2 is located in the positive pole avoidance inner hole 401. The steel cover 4 is provided with a sealing bead 402 at the edge of the positive pole avoidance inner hole 401. The nano-injected plastic 3 is coated on the sealing bead 402 and pressed on the crimping boss 201 of the positive pole 2.

[0045] The basic working principle of the pole installation and sealing structure for the cylindrical battery involved in the present utility model is as follows: First, a crimping boss 201 is arranged on the side surface of the positive pole 2. Then, a positive pole avoidance inner hole 401 is arranged in the steel cover 4, and the positive pole 2 is arranged in the positive pole avoidance inner hole 401. Then, a sealing bead 402 is arranged at the edge of the positive pole avoidance inner hole 401 of the steel cover 4. Finally, after nano-treatment of the sealing bead 402 and the crimping boss 201, the nano-injected plastic 3 is coated on the sealing bead 402 and pressed on the crimping boss 201 of the positive pole 2, thereby enhancing the bonding strength between the nano-injected plastic 3, the steel cover 4, and the positive pole 2, effectively improving the installation stability and sealing strength of the positive pole 2 and the positive current collector plate 5. By using the pole installation and sealing structure, the structural design of the sealed pole can be simplified, the use cost can be reduced, the bonding strength between the plastic and the metal can be greatly improved, and the sealing effect can be enhanced. At the same time, by using the pole installation and sealing structure, the functions of various traditional scattered parts for sealing can be integrated, having insulation characteristics, better sealing effects, and longer service life.

[0046] See Figures 1 to 4 , the following further illustrates the present utility model with a specific embodiment:

[0047] In this embodiment, see Figure 2, As a preferred design, a stepped pole through-hole 202 is provided inside the positive pole 2. The pole through-hole 202 facilitates the welding of the positive pole 2 and the positive current collector plate 5. It also includes a positive pole sealing assembly 6. The positive pole sealing assembly 6 includes a sealing cover 601 and a sealing glue nail 602. The sealing glue nail 602 is arranged in the stepped pole through-hole 202 of the positive pole 2 and presses tightly on the welding joint between the positive pole 2 and the positive current collector plate 5. The sealing cover 601 is arranged in the stepped pole through-hole 202 of the positive pole 2 and presses tightly on the sealing glue nail 602. The positive pole sealing assembly 6 can seal the cylindrical battery, prevent the leakage of alkaline liquid, and further enhance the sealing effect of the positive pole 2.

[0048] In this embodiment, referring to Figure 2 , As a preferred design, the crimping boss 201 of the positive pole 2 presses tightly on the insulating rubber sleeve 7, which can increase the stability of the fixation of the positive current collector plate 5 and improve the sealing performance between the two.

[0049] In this embodiment, referring to Figure 2 , As a preferred design, the positive pole 2 is provided with a sealing cylindrical surface on the side above the crimping boss 201, so that the nano-injection molded plastic 3 can be in close contact with the sealing cylindrical surface, and further improve the sealing effect of the positive pole 2.

[0050] In this embodiment, referring to Figure 3 , As a preferred design, the crimping boss 201 of the positive pole 2 is a circular ring structure, which can increase the contact area between the nano-injection molded plastic 3 and the positive pole 2, further improve the bonding strength between the nano-injection molded plastic 3 and the positive pole 2, and make the combination more compact.

[0051] In this embodiment, referring to Figure 3 , As a preferred design, the sealing edge 402 of the steel cover 4 is a circular ring structure, which can increase the contact area between the sealing edge 402 and the nano-injection molded plastic 3, further improve the bonding strength between the steel cover 4 and the nano-injection molded plastic 3, and further improve the sealing effect.

[0052] In this embodiment, referring to Figure 4 , As a preferred design, the sealing edge 402 of the steel cover 4 is provided with a number of edge notches 403 along the circumferential direction. The edge notches 403 cooperate with the nano-injection molded plastic 3 to limit the positive pole 2, thereby restricting the movement of the positive pole 2 in the positive pole avoidance inner hole 401, and improving the stability and reliability of the pole installation sealing structure during use.

[0053] In this embodiment, referring to Figure 3 , As a preferred design, the material of the insulating rubber sleeve 7 is natural rubber. Natural rubber has good elasticity, high strength, good insulation, small deformation during use, and is easy to process.

[0054] As can be seen from the above, the pole installation and sealing structure of the cylindrical battery of the present utility model has the following beneficial effects:

[0055] 1. By providing a sealing bead 402 on the steel cover 4 and a crimping boss 201 on the positive pole 2, the structure of the sealed pole is greatly simplified, the use of related consumables can be significantly reduced, the use cost can be reduced, and it is conducive to assembly and production manufacturing, and the stability of the sealed pole structure can be improved;

[0056] 2. By providing the nano-injected plastic 3, the bonding force between the plastic and the metal is increased by using nano-molecules, so that the steel cover 4 and the positive pole 2 are tightly bonded, the strength and sealing effect of the positive pole 2 are greatly improved, the functions of various traditional loose parts for sealing can be integrated, and it has insulating properties and better sealing effects, and has a longer service life.

[0057] In summary, the present utility model effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0058] The above embodiments are only illustrative of the principles and effects of the present utility model, and are not used to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A pole installation and sealing structure for a cylindrical battery, the cylindrical battery comprising a bare battery cell (1), a positive current collector plate (5), and a positive pole (2), the positive current collector plate (5) being disposed at the positive end of the bare battery cell (1), the positive pole (2) being disposed on the positive current collector plate (5), characterized in that: A crimping boss (201) is provided on the side surface of the positive electrode post (2); the post mounting and sealing structure includes a nano-injected plastic (3), an insulating rubber sleeve (7), and a steel cover (4). The insulating rubber sleeve (7) is sleeved on the end of the bare battery cell (1) and pressed above the positive current collector plate (5), and is located below the crimping boss (201). The steel cover (4) is pressed above the insulating rubber sleeve (7). A positive electrode avoidance inner hole (401) is provided in the steel cover (4). The positive electrode post (2) is located in the positive electrode avoidance inner hole (401). The steel cover (4) is provided with a sealing bead (402) at the edge of the positive electrode avoidance inner hole (401). The nano-injected plastic (3) is coated on the sealing bead (402) and pressed on the crimping boss (201) of the positive electrode post (2).

2. The pole installation and sealing structure of the cylindrical battery according to claim 1, characterized in that: A stepped post through hole (202) is formed inside the positive electrode post (2). A positive electrode post sealing assembly (6) is further included. The positive electrode post sealing assembly (6) includes a sealing cover (601) and a sealing glue nail (602). The sealing glue nail (602) is arranged in the stepped post through hole (202) of the positive electrode post (2) and presses the welding joint between the positive electrode post (2) and the positive current collector plate (5). The sealing cover (601) is fixedly arranged in the stepped post through hole (202) of the positive electrode post (2) and presses the sealing glue nail (602).

3. The pole installation and sealing structure of the cylindrical battery according to claim 1, characterized in that: The crimping boss (201) of the positive electrode post (2) presses on the positive current collector plate (5).

4. The pole installation and sealing structure of the cylindrical battery according to claim 1, wherein: A sealing cylindrical surface is provided on the side surface of the positive electrode post (2) above the crimping boss (201). The nano-injected plastic (3) is in close contact with the sealing cylindrical surface.

5. The pole column mounting and sealing structure of the cylindrical battery according to claim 1, characterized in that: The crimping boss (201) of the positive electrode post (2) is a ring-shaped structure.

6. The pole installation and sealing structure of the cylindrical battery according to claim 1, characterized in that: The sealing bead (402) of the steel cover (4) is a ring-shaped structure.

7. The pole installation and sealing structure of the cylindrical battery according to claim 6, characterized in that: The sealing bead (402) of the steel cover (4) is provided with a plurality of bead notches (403) along the circumferential direction.

8. The pole post mounting and sealing structure of the cylindrical battery according to claim 1, wherein: The insulating rubber sleeve (7) is made of natural rubber.

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