PIN ASSEMBLY FOR CELL

Abstract

The disclosure provides a pin assembly for a cell. The cell includes an electrode assembly comprising a central hole, and the pin assembly includes a housing, at least one electrode lead, and an insulating part. The housing includes a tube including a top opening and a bottom opening. The tube is disposed in the central hole of the cell. The insulating part is fully or partially disposed in the tube. The at least one electrode lead penetrates through the insulating part; a lower end of the at least one electrode lead is electrically connected to a positive electrode and/or a negative electrode of the cell, thereby leading out the polarity of the cell.

Claims

1. A pin assembly for a cell, the cell comprising an electrode assembly comprising a central hole, and the pin assembly comprising: a housing; at least one electrode lead; and an insulating part; wherein: the housing comprises a tube comprising a top opening and a bottom opening; the tube is disposed in the central hole of the electrode assembly of the cell; the insulating part is fully or partially disposed in the tube; the at least one electrode lead penetrates through the insulating part; a lower end of the at least one electrode lead is electrically connected to a positive electrode and/or a negative electrode of the cell, thereby leading out a polarity of the cell.

2. The pin assembly of claim 1, wherein the housing has a longitudinal section in the shape of “” and further comprises a disc-shaped flange extending outwardly from a top of the tube.

3. The pin assembly of claim 1, wherein the housing has a longitudinal section in the shape of “” and further comprises two circular tubes extending outwardly from two ends of a top of the tube.

4. The pin assembly of claim 1, wherein the housing has a longitudinal section in the shape of “”.

5. The pin assembly of claim 1, wherein the cell comprises at least one positive electrode, at least one negative electrode, and at least one diaphragm separating the at least one positive electrode from the at least one negative electrode; the at least one positive electrode, the at least one negative electrode and the at least one diaphragm are disposed around the central hole in a spiral winding manner; and the central hole has a diameter of greater than 0 and smaller than that of the cell.

6. The pin assembly of claim 1, wherein the pin assembly is hermetically connected to a cell housing of the cell, thus forming a ring-shaped seal cavity for accommodating the electrode assembly.

7. The pin assembly of claim 1, wherein the insulating part has a longitudinal section in the shape of “” and comprises a columnar part inserted into the tube and an end cap that extends outwardly from a bottom of the columnar part to fully cover a lower end of the tube.

8. The pin assembly of claim 1, further comprising a liquid injection hole through which an electrolyte flows into the cell.

9. The pin assembly of claim 8, wherein the liquid injection hole is disposed on the pin assembly and/or on the insulating part.

10. The pin assembly of claim 9, wherein the liquid injection hole penetrates through the insulating part, and is positioned at a center or eccentric position of the insulating part; and the liquid injection hole is sealed by a sealing member.

11. The pin assembly of claim 10, wherein the sealing member adopts one of the following structures: the sealing member comprises an end cap structure; the end cap structure comprises an end and an embedded part disposed at the lower end of the end; the end covers the tube, and the embedded part is disposed in the tube; and the sealing member comprises at least one steel ball; the at least one steel ball is disposed in the liquid inj ection hole in an interference fit.

12. The pin assembly of claim 11, wherein the pin assembly comprises a waterproof material.

13. The pin assembly of claim 12, wherein the waterproof material is a metal material or a non-metal material.

14. The pin assembly of claim 13, wherein the metal material is stainless steel, aluminum, or aluminum alloy.

15. The pin assembly of claim 13, wherein the non-metal material is ceramic or plastic.

16. The pin assembly of claim 1, wherein the insulating part comprises polypropylene.

17. The pin assembly of claim 1, wherein the at least electrode lead comprises an aluminum sheet or a nickel sheet.

Description

BRIEF DESCRIPTION OF THE DIAGRAMS

[0032] FIG. 1 is a schematic diagram of a pin assembly of Example 1 of the disclosure;

[0033] FIG. 2 is a schematic diagram of a pin assembly of Example 2 of the disclosure;

[0034] FIG. 3 is a schematic diagram of a pin assembly of Example 3 of the disclosure;

[0035] FIG. 4 is a schematic diagram of a pin assembly of Example 4 of the disclosure;

[0036] FIG. 5 is a schematic diagram of a pin assembly of Example 4 of the disclosure;

[0037] FIG. 6 is a schematic diagram of a sealing member of the disclosure;

[0038] FIG. 7 is another schematic diagram of a sealing member of the disclosure;

[0039] FIG. 8 is a schematic diagram of a cell comprising a pin assembly of the disclosure; and

[0040] FIG. 9 is another schematic diagram of a cell comprising a pin assembly of the disclosure.

DESCRIPTION OF THE INVENTION

[0041] To further illustrate, embodiments detailing a cell are described below. It should be noted that the following embodiments are intended to describe and not to limit the disclosure.

Example 1

[0042] As shown in FIG. 1, a pin assembly 100A for a cell comprises a housing 101, a positive electrode lead 103, and a negative electrode lead 104, and an insulating part 102.

[0043] The housing 101 has a longitudinal section in the shape of “” and comprises a tube comprising a top opening and a bottom opening, and a disc-shaped flange extending outwardly from the top of the tube. The tube is disposed in a central hole of an electrode assembly of the cell. The insulating part 102 is partially disposed in the tube. The positive electrode lead 103 and the negative electrode lead 104 penetrate through the insulating part 102. The lower ends of the positive electrode lead 103 and the negative electrode lead 104 are soldered to the positive electrode and/or the negative electrode of the cell, respectively, thereby leading out the polarity of the cell.

[0044] The insulating part 102 has a longitudinal section in the shape of “”, and comprises a columnar part inserted into the tube of the housing 101 and an end cap that extends outwardly from the bottom of the columnar part to fully cover the lower end of the tube of the housing 101.

[0045] The positive electrode lead 103 and the negative electrode lead 104 comprise an aluminum sheet or a nickel sheet.

[0046] A liquid injection hole is disposed on the insulating part 102. The liquid injection hole penetrates through the insulating part, and is positioned at the center or eccentric position of the insulating part.

[0047] It should be noted that the dimensions of the pin assembly 100A and the electrode leads are determined according to the conventional knowledge of the person skilled in the art, and are not described in detail again.

[0048] During process, the lower ends of the positive electrode lead 103 and the negative electrode lead 104 extend beyond the tube of the housing 101, and the upper ends extend beyond the disc-shaped flange. The insulating part 102 is injected into the tube by template injection molding. Preferably,

[0049] the insulating part 102 is made of polypropylene. Finally, the positive electrode lead 103 and the negative electrode lead 104 in the tube are completely wrapped. At the same time, a through hole is formed in the center or eccentric of the tube, that is, the liquid injection hole. The outer wall of the insulating part 102 is tightly combined with the inner wall of the tube, and the positive electrode lead 103 and the negative electrode lead 104 are symmetrically disposed in the insulating part 102.

Example 2

[0050] The example is modified based on Example 1, which is basically the same as Example 1 except for the structure of the housing 101.

[0051] Specifically, as shown in FIG. 2, the housing 101 of the pin assembly 100B for a cell has a longitudinal section in the shape of “” and comprises a tube comprising a top opening and a bottom opening, and two circular tubes extending outwardly from two ends of the top of the tube.

Example 3

[0052] The example is modified based on Examples 1-2, which is basically the same as Examples 1-2 except for the structure of the housing 101.

[0053] Specifically, as shown in FIG. 3, the housing 101 of the pin assembly 100C for a cell has a longitudinal section in the shape of “” and comprises a circular tube comprising a top opening and a bottom opening.

Example 4

[0054] The example is modified based on Example 1, which is basically the same as Example 1 except for the structure of the insulating part 102. Specifically, as shown in FIG. 4, no liquid injection hole is disposed on the insulating part 102 of the pin assembly 100D. Optionally, in Examples 2-3, the insulating part 102 is also provided with no liquid injection hole, and the liquid injection hole is disposed on other part of the cell.

Example 5

[0055] The example is modified based on Example 1, which is basically the same as Example 1 except that, as shown in FIG. 5, only one electrode lead is led out from the pin assembly. The electrode lead is a positive electrode lead 103 or a negative electrode lead 104.

[0056] Optionally, in Examples 2-4, modification such as only one electrode lead is disposed on the pin assembly, which is not detailed any more.

[0057] Optionally, in Examples 1, 2, 3 and 5, the liquid injection hole is disposed on the insulating part 102 of the pin assembly. Furthermore, the liquid injection hole is sealed by a sealing member. The sealing member adopts one of the following structures:

[0058] 1. As shown in FIG. 6, the sealing member comprises an end cap structure; the end cap structure comprises an end and an embedded part disposed at the lower end of the end; the end covers the upper part of the tube, and the embedded part is disposed in the tube; and

[0059] 2. As shown in FIG. 7, the sealing member comprises at least one steel ball; the at least one steel ball is disposed in the liquid injection hole in an interference fit.

[0060] The cell house matched with the housing of the pin assembly in Example 2 has a longitudinal section in the shape of “−”. The cell house is spliced to or integrally formed with the housing.

[0061] The cell house matched with the housing of the pin assembly in Example 3 has a longitudinal section in the shape of “”. The cell house is spliced to or integrally formed with the housing.

[0062] The cell house is hermetically connected to the housing, thus forming a ring-shaped seal cavity for accommodating the electrode assembly.

[0063] Optionally, the pin assembly comprises a waterproof material. The waterproof material is a metal material or a non-metal material. The metal material is stainless steel, aluminum, or aluminum alloy. The non-metal material is ceramic or plastic.

[0064] As shown in FIGS. 8 and 9, when the pin assembly of Example 1 is applied to a cell, the lower ends of the positive electrode lead 103 and the negative electrode lead 104 are electrically connected to the positive electrode and the negative electrode, respectively. Specifically, one of the following two connection modes is adopted:

[0065] 1). As shown in FIG. 8, the lower ends of the positive electrode lead and the negative electrode lead are soldered to one end of a first intermediate conductor and one end of a second intermediate conductor, respectively; and the other end of the first intermediate conductor and the other end of the second intermediate conductor are soldered to the positive electrode or the negative electrode, respectively;

[0066] 2). As shown in FIG. 9, the lower end of one electrode lead is soldered to the positive electrode or the negative electrode.

[0067] The cell of the disclosure comprises a central hole, at least one positive electrode 201, at least one negative electrode 202, and a diaphragm 203 separating the positive electrode and the negative electrode. The positive electrode 201, the negative electrode 202 and the diaphragm 203 are disposed around the central hole in a spiral winding manner. The central hole has a diameter greater than 0 and smaller than that of the cell.

[0068] A layer of insulating tape 300-a is disposed on the inner surface of the bottom end of the cell housing 300 to prevent short circuit between the positive electrode lead 103, and the negative electrode lead 104 and the cell housing 300, and further prevent the short circuit between the first transition conductor 204, the second transition conductor 205 and the cell housing 300.

[0069] During assembly, the insulating part 102 is disposed into the housing 101 by injection molding to completely wrap up the positive electrode lead 103 and the negative electrode lead 104 in the tube. Further, the liquid injection hole 400 is longitudinally disposed on the insulating part 102. The liquid injection hole is sealed by the sealing member. The insulating part 102 is tightly attached to the inner wall of the tube. The tube is inserted into the central hole. The positive electrode lead 103 and the negative electrode lead 104 are bent outward and soldered to the first transition conductor 204 and the second transition conductor 205, respectively. Thereafter, the joint of the hosing and the cell housing is sealed through laser soldering. The electrolyte is injected through the liquid injection hole 400 on the insulating part 102 into the cell. Thereafter, the liquid injection hole 400 is blocked, and the cell is then performed with general procedures such as formation and sorting to form a cylindrical chargeable and dischargeable secondary lithium-ion cell. In this way, the arrangement of the central hole of the pin assembly realizes the insulation and leading out of the positive and negative electrodes of the cell. The positive electrode lead 103 is the positive pole of the cell, and the negative electrode lead 104 is the negative pole of the cell, thus avoiding the occupation of space in the height direction or diameter direction for polarity separation.

[0070] It will be obvious to those skilled in the art that changes and modifications may be made, and therefore, the aim in the appended claims is to cover all such changes and modifications.