Lithium ion battery lead sealing structure

Abstract

The utility model belongs to the technical field of lithium ion battery manufacturing, and particularly relates to a lead sealing structure of a lithium ion battery. Comprising a top cover plate, and a cover plate wire hole is formed in the top cover plate; a wire passes through the top cover plate through the cover plate wire hole; the cover plate wire hole comprises a guide hole and a sealing hole; the size of the guide hole is matched with the diameter of a wire, and the size of the sealing hole is larger than that of the guide hole. A sealing ring and a threaded connecting piece are sequentially installed in the sealing hole from bottom to top. A hole for a wire to pass through is reserved in the middle of the sealing ring and the threaded connecting piece. Through the matching of the sealing ring and the threaded connecting piece, the lead for connecting the inside and the outside of the battery cell is well sealed, the assembly is simple, the later maintenance can be realized, and the liquid leakage risk in the manufacturing of the internal heating battery is greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium ion battery manufacturing, and in particular relates to a lithium ion battery wire sealing structure. Background Art

[0002] Lithium-ion batteries, hailed as the "green chemical energy" of the 21st century, have been widely used in a wide range of fields, including consumer electronics, power batteries, and energy storage. Prismatic batteries offer high packaging reliability, high system energy efficiency, relative lightness, high energy density, easy capacity expansion, and a high degree of manufacturing automation. With the rapid development of the new energy and energy storage industries, their market share is rapidly increasing.

[0003] Lithium batteries suffer from reduced charge and discharge capabilities when used at low temperatures, resulting in reduced vehicle range and customer dissatisfaction. Currently, external heating is commonly used, but this method is inefficient and takes a long time to heat up. Furthermore, to assess battery cell safety, it is also necessary to heat the cells internally to trigger thermal runaway. The preparation of these cells requires the use of wires passing through the lithium battery casing. Due to the presence of electrolyte within the cell, sealing the wires has become a major challenge in the manufacture of internally heated batteries.

[0004] Therefore, a lithium-ion battery wire sealing structure is needed to solve the above problems. Utility Model Content

[0005] In response to the above problems, the present invention proposes a lithium-ion battery wire sealing structure, comprising a top cover plate, on which a cover plate wire hole is formed; the wire passes through the top cover plate through the cover plate wire hole; the cover plate wire hole includes a guide hole and a sealing hole; the size of the guide hole is adapted to the diameter of the wire, and the size of the sealing hole is larger than the size of the guide hole; a sealing ring and a threaded connector are installed in the sealing hole in sequence from bottom to top; a hole for the wire to pass through is left in the middle of the sealing ring and the threaded connector.

[0006] Furthermore, the sealing hole includes a sealing groove and a threaded hole; the sealing groove is used to place a sealing ring, and the threaded hole is connected to a threaded connector.

[0007] Furthermore, a fastening hole is provided on the upper surface of the threaded connector.

[0008] Furthermore, the sealing groove and the sealing ring are in the shape of an inverted frustum.

[0009] Furthermore, the height of the sealing groove is greater than the height of the sealing ring.

[0010] Furthermore, the height of the threaded connection piece is greater than or equal to the height of the threaded hole.

[0011] Furthermore, the diameter of the upper end of the sealing groove is greater than or equal to the diameter of the threaded hole.

[0012] Furthermore, the sealing ring has electrolyte corrosion resistance.

[0013] Furthermore, the threaded connection is made of metal.

[0014] Furthermore, the outside of the wire is wrapped with an electrolyte-resistant insulation layer.

[0015] The utility model forms a good seal for the wires connecting the inside and outside of the battery cell through the cooperation of the sealing ring and the threaded connector, and the assembly is simple and maintainable later, which greatly reduces the risk of leakage in the manufacture of internal heating batteries.

[0016] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained by the structures indicated in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 Shown is a cross-sectional view of the present invention.

[0019] Figure 2 A top view of the threaded connector of the present invention is shown.

[0020] In the figure, 1, top cover plate; 21, guide hole; 22, sealing hole; 221, sealing groove; 222, threaded hole; 3, wire; 4, sealing ring; 5, threaded connector; 6, fastening hole. DETAILED DESCRIPTION

[0021] 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 part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0022] The present invention provides a lithium-ion battery wire sealing structure to solve the problem in the prior art that wire sealing restricts the manufacture of internal heating batteries. Figure 1 , including a top cover plate 1, the top cover plate 1 is provided with a cover plate wire hole; the wire 3 passes through the top cover plate 1 through the cover plate wire hole; the cover plate wire hole includes a guide hole 21 and a sealing hole 22; the size of the guide hole 21 is adapted to the diameter of the wire 3, and the size of the sealing hole 22 is larger than the size of the guide hole 21; the sealing hole 22 is sequentially installed with a sealing ring 4 and a threaded connector 5 from bottom to top; a hole is left in the middle of the sealing ring 4 and the threaded connector 5 for the wire 3 to pass through; during the heating process inside the battery, the wire 3 is passed from the inside of the battery cell through the cover plate wire hole to the battery The outside of the core is then passed through the sealing ring 4 from the upper end of the wire 3. The hole in the middle of the sealing ring 4 is slidably sealed and connected to the wire 3. After the sealing ring 4 moves to the position of the sealing hole 22, the threaded connector 5 is passed through the upper end of the wire 3. The hole of the threaded connector 5 is larger than the diameter of the wire 3. The threaded connector 5 moves into the sealing hole 22. In the process of tightening the threaded connector 5, the threaded connector 5 compresses the sealing ring 4 to achieve sealing between the wire 3 and the top cover plate 1. The sealing ring 4 cooperates with the threaded connector 5 to improve the overall sealing effect.

[0023] At the same time, the inner wall of the cover plate wire hole is made of aluminum alloy, which improves the corrosion resistance of the top cover plate 1 and ensures the overall sealing effect. After sealing, the wire 3 undergoes normal baking, electrolyte injection, formation, sealing, and capacity separation processes.

[0024] The sealing hole 22 includes a sealing groove 221 and a threaded hole 222; the sealing groove 221 is used to place the sealing ring 4, and the threaded hole 222 is connected to the threaded connector 5; the sealing ring 4 passes through the wire 3 and moves into the sealing groove 221. After the threaded connector 5 moves to the upper end of the threaded hole 222, the threaded connector 5 is rotated to move downward in the threaded hole 222, and the threaded connector 5 squeezes the sealing ring 4 to improve the overall sealing performance.

[0025] In one embodiment, referring to Figure 2 A fastening hole 6 is provided on the upper surface of the threaded connector 5; a tool is inserted into the fastening hole 6, and the fastening hole 6 is rotated to drive the threaded connector 5 to rotate, thereby making the installation process of the threaded connector 5 more convenient.

[0026] The sealing groove 221 and the sealing ring 4 are in an inverted cone shape; setting the sealing ring 4 and the sealing groove 221 to an inverted cone shape extends the path between the sealing ring 4 and the side of the sealing groove 221, and at the same time, the side of the sealing ring 4 is tilted downward, further improving the sealing effect of the sealing ring 4.

[0027] The height of the sealing groove 221 is greater than the height of the sealing ring 4; after the sealing ring 4 is placed in the sealing groove 221, the diameter of the lower end of the sealing ring 4 is greater than the diameter of the wire 3, and the diameter of the lower end of the sealing groove 221 is almost equal to the diameter of the wire 3. At the same time, the threaded connector 5 needs to be moved to the lower end of the threaded hole 222 to set the upper end of the sealing groove 221 to squeeze the sealing ring 4, so the height of the sealing ring 4 is to be less than the height of the sealing groove 221 to ensure the sealing effect of the sealing ring 4.

[0028] The height of the threaded connector 5 is ≥ the height of the threaded hole 222; when the threaded connector 5 is sealed at the upper end of the top cover plate 1, the threaded connector 5 moves to the lower end of the threaded hole 222 and then continues to move downward, and part of the threaded connector 5 enters the sealing groove 221, squeezing the sealing ring 4, and the threaded connector 5 and the sealing ring 4 cooperate to perform double sealing on the whole.

[0029] The diameter of the upper end of the sealing groove 221 is ≥ the diameter of the threaded hole 222; in the process of the threaded connector 5 being connected to the threaded hole 222 to squeeze the sealing ring 4, after the lower end of the threaded connector 5 moves to the lower end of the threaded hole 222, the threaded connector 5 can continue to move downward to squeeze the sealing ring 4, thereby improving the sealing effect of the sealing ring 4.

[0030] At the same time, when the diameter of the upper end of the sealing groove 221 is larger than the diameter of the threaded hole 222, a stepped structure is formed between the lower end of the threaded hole 222 and the upper end of the sealing groove 221, which cooperates with the sealing ring 4 at the lower end to achieve a better sealing effect.

[0031] The sealing ring 4 has electrolyte corrosion resistance; the sealing ring 4 is preferably made of fluororubber, which has excellent resistance to strong corrosive media and strong oxidants, and can have electrolyte corrosion resistance, further ensuring the sealing effect of the sealing ring 4.

[0032] The threaded connector 5 is made of metal; the threaded connector 5 can be a sealing nut, which has high strength and reliability through threaded connection, good sealing performance, and can effectively prevent electrolyte leakage. At the same time, it is very easy to install and adjust; the material of the sealing nut can be aluminum alloy, which forms a dense oxide film on the surface in contact with air and has excellent corrosion resistance, titanium alloy, which has the advantages of high strength, good corrosion resistance and high heat resistance, stainless steel and other metal materials, stainless steel also has the characteristics of good corrosion resistance.

[0033] The outside of the wire 3 is wrapped with an electrolyte-resistant insulation layer; the inner core of the wire 3 is made of metal, and the electrolyte-resistant insulation layer is used on the outside of the wire 3 to protect the inner core of the wire 3; the electrolyte-resistant insulation layer can be PP, PE, PET, PI, fluoroplastic PTFE and fluororubber FFKM.

[0034] The utility model forms a good seal for the wire 3 connecting the inside and outside of the battery cell through the cooperation of the sealing ring 4 and the threaded connector 5, and the assembly is simple and maintainable later, which greatly reduces the risk of leakage in the manufacture of internal heating batteries.

[0035] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A lithium-ion battery wire sealing structure, characterized in that: The invention comprises a top cover plate (1), wherein a cover plate wire hole is provided on the top cover plate (1); a wire (3) passes through the top cover plate (1) through the cover plate wire hole; the cover plate wire hole comprises a guide hole (21) and a sealing hole (22); the size of the guide hole (21) is adapted to the diameter of the wire (3), and the size of the sealing hole (22) is larger than the size of the guide hole (21); a sealing ring (4) and a threaded connector (5) are sequentially installed in the sealing hole (22) from bottom to top; a hole for the wire (3) to pass through is reserved in the middle of the sealing ring (4) and the threaded connector (5).

2. A lithium-ion battery wire sealing structure according to claim 1, characterized in that: The sealing hole (22) comprises a sealing groove (221) and a threaded hole (222); the sealing groove (221) is used to place a sealing ring (4), and the threaded hole (222) is connected to a threaded connector (5).

3. A lithium-ion battery wire sealing structure according to claim 2, characterized in that: A fastening hole (6) is provided on the upper surface of the threaded connection piece (5).

4. A lithium-ion battery wire sealing structure according to claim 3, characterized in that: The sealing groove (221) and the sealing ring (4) are in the shape of an inverted frustum.

5. A lithium-ion battery wire sealing structure according to claim 4, characterized in that: The height of the sealing groove (221) is greater than the height of the sealing ring (4).

6. A lithium-ion battery wire sealing structure according to claim 5, characterized in that: The height of the threaded connection member (5) is greater than or equal to the height of the threaded hole (222).

7. A lithium-ion battery wire sealing structure according to claim 6, characterized in that: The diameter of the upper end of the sealing groove (221) is greater than or equal to the diameter of the threaded hole (222).

8. A lithium-ion battery wire sealing structure according to claim 7, characterized in that: The sealing ring (4) has electrolyte corrosion resistance.

9. A lithium-ion battery wire sealing structure according to claim 8, characterized in that: The threaded connection piece (5) is made of metal.

10. A lithium-ion battery wire sealing structure according to claim 9, characterized in that: The outside of the wire (3) is wrapped with an electrolyte-resistant insulation layer.

Images