Battery cell with multi-layer sealing structure

Abstract

The utility model relates to a battery cell, in particular to a battery cell with a multilayer sealing structure, which comprises a pole, a shell, a nut, a first insulator, a second insulator and a sealing body, the shell is provided with an opening for the pole to penetrate out from the inside to the outside, and the nut is connected with the part, extending out of the shell, of the pole. The first insulator is distributed outside the shell and arranged between the opposite surfaces of the nut and the shell, the second insulator is distributed inside the shell and arranged between the opposite surfaces of the pole and the shell, the sealing body is provided with three sealing surfaces in a first direction, and the three sealing surfaces are respectively defined as a first sealing surface, a second sealing surface and a third sealing surface; the first sealing face is attached to one end face of the nut, the second sealing face is attached to one end face of the shell, and the third sealing face is attached to the other end face of the shell. The battery cell with the multi-layer sealing structure disclosed by the utility model has relatively high sealing performance.

Description

Technical Field

[0001] This utility model relates to a battery cell, and more particularly to a battery cell with a multi-layer sealing structure. Background Technology

[0002] Battery safety is becoming increasingly prominent, with preventing leakage of the battery cell and ensuring proper insulation against internal and external moisture being crucial guarantees of battery safety. Traditional single-layer sealing structures for battery cells clearly cannot meet these requirements. To address this, Chinese invention patent CN117374491B discloses a battery and electrical device that achieves a three-layer seal at the connection between the battery cell and the casing, thus improving battery safety. In this patent, the three layers of the multi-layer sealing ring are achieved through mutual contact with the first insulating component, the plate body, and the second insulating component. In reality, the seal between the multi-layer sealing ring and the plate body is only a single layer. Furthermore, in this patent, the mounting component used to compress and fix the multi-layer sealing ring is fixed by riveting. The disadvantage of this design is that it cannot effectively control the compression of the multi-layer sealing ring.

[0003] Therefore, it is necessary to improve the existing cell sealing structure. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, a battery cell with a multi-layer sealing structure is provided to improve the sealing performance of the battery cell and ensure the safety of battery use.

[0005] To address the aforementioned problems, this utility model discloses a battery cell with a multi-layer sealing structure, comprising:

[0006] pole;

[0007] The outer casing is provided with an opening for the electrode post to pass through from the inside to the outside;

[0008] The nut is connected to the portion of the pole that extends out of the housing;

[0009] The first insulator is distributed on the outside of the housing and disposed between the nut and the opposite surface of the housing;

[0010] The second insulator is distributed inside the housing and disposed between the pole and the opposite surface of the housing;

[0011] The sealing body has three sealing surfaces in a first direction, which are defined as a first sealing surface, a second sealing surface and a third sealing surface, respectively. The first sealing surface is in contact with one end face of the nut, the second sealing surface is in contact with one end face of the outer shell, and the third sealing surface is in contact with the other end face of the outer shell.

[0012] Preferably, the sealing body is in a stepped cylindrical shape, a top surface of the sealing body forms a first sealing surface, a first stepped surface of the sealing body forms a second sealing surface, and a second stepped surface of the sealing body forms a third sealing surface.

[0013] Preferably, the pole column is in a stepped cylindrical shape, the pole column is divided into at least a first part and a second part in the axial direction, the first part penetrates the sealing body, and the second part is arranged in the shell, an upper surface of the second part and a bottom surface of the sealing body are mutually attached.

[0014] Preferably, the nut is provided with a through stepped hole, the through stepped hole is divided into a first hole part and a second hole part in the axial direction in sequence, an inner wall of the first hole part is provided with an internal thread for connecting with the pole column, an end surface of the second hole part and the first sealing surface of the sealing body are mutually attached, and a diameter of the second hole part is greater than a diameter of the first part.

[0015] Preferably, the shell is provided with a recess, the recess is arranged concentrically with the opening, an end surface of the recess and the second sealing surface are mutually attached, and an inner wall of the shell and the third sealing surface are mutually attached.

[0016] Preferably, a single-sided sealing length defining the first sealing surface is L1≥0.5mm, a single-sided sealing length defining the second sealing surface and the third sealing surface is L2, and L2≥0.9mm.

[0017] Preferably, a compression amount defining the first sealing surface is A, 10%≤A≤45%; and a compression amount defining the second sealing surface and a compression amount defining the third sealing surface are B, 15%≤B≤45%.

[0018] Preferably, the sealing body is made of EPDM or FKM.

[0019] Compared with the prior art, the utility model has the following improvements and beneficial effects:

[0020] (1) The sealing structure between the sealing body and the shell is improved. In the prior art, the shell and the sealing body are single-layer sealed; in the present scheme, a recess is arranged on the inner side of the shell, an end surface of the recess and the second sealing surface are mutually attached, an inner wall of the shell and the third sealing surface are mutually attached, and double-layer sealing between the sealing body and the shell is realized.

[0021] (2) The fixing mode of the sealing body is improved. In the prior art, the sealing body is relatively fixed through the clamping of the mounting piece; in the present scheme, the sealing body is relatively fixed through the nut, and the compression amount of the sealing body can be adjusted during the assembly of the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1This is a cross-sectional view of the structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the sealing body in this utility model;

[0024] Figure 3 This is a schematic diagram of the nut structure in this utility model;

[0025] Figure 4 This is a cross-sectional view of the outer shell of this utility model;

[0026] Figure 5 This is the front view below the sectional view of this utility model.

[0027] In the figure, 1 is the pole; 2 is the outer casing; 3 is the opening; 4 is the nut; 5 is the first insulator; 6 is the second insulator; 7 is the sealing body; 8 is the first sealing surface; 9 is the second sealing surface; 10 is the third sealing surface; 11 is the first section; 12 is the second section; 13 is the stepped hole; 14 is the first hole; 15 is the second hole; and 17 is the recess. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1 To be continued Figure 5 The principles and features of this utility model are described, and the examples given are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0029] A battery cell with a multi-layer sealing structure, see attached figure. Figure 1 It includes a pole post 1, a housing 2, a nut 4, a first insulator 5, a second insulator 6, and a sealing body 7. The housing 2 has an opening 3 for the pole post 1 to pass through from the inside to the outside, with the top of the pole post 1 protruding through the opening 3. (See attached...) Figure 1 Using the orientation as a reference, the interior of outer shell 2 is for attachment. Figure 1 On side E, the exterior of outer shell 2 is attached. Figure 1 On side F of the housing, nut 4 is connected to the portion of pole 1 extending into housing 2. First insulator 5 is located on the exterior of housing 2 and positioned between the nut 4 and the opposing surfaces of housing 2. Second insulator 6 is located inside housing 2 and positioned between the pole 1 and the opposing surfaces of housing 2. First insulator 5 and second insulator 6 are typically made of non-conductive materials, such as polyimide, polytetrafluoroethylene, or thin fiberglass cloth.

[0030] Specifically, refer to the appendix Figure 2 The sealing body 7 has three sealing surfaces in the first direction, defined as a first sealing surface 8, a second sealing surface 9, and a third sealing surface 10. Generally, the sealing body 7 is made of EPDM or FKM material. The aforementioned first direction refers to the axial direction of the sealing body 7, i.e., the direction of the axial direction. Figure 2In the X direction. The sealing body 7 is a stepped cylinder, with its top surface forming a first sealing surface 8, the first stepped surface of the sealing body 7 forming a second sealing surface 9, and the second stepped surface of the sealing body 7 forming a third sealing surface 10. (Attached) Figure 2 Using the orientation as a reference, the first sealing surface 8 is located at the top, the third sealing surface 10 is located at the bottom, and the second sealing surface 9 is located between the first sealing surface 8 and the third sealing surface 10. The first sealing surface 8 is in contact with one end face of the nut 4, the second sealing surface 9 is in contact with one end face of the outer shell 2, and the third sealing surface 10 is in contact with the other end face of the outer shell 2. Thus, a double-layer seal can be achieved between the sealing body 7 and the outer shell 2.

[0031] To further explain the relationship between the sealing body 7 and the other components of the battery cell, the specific structures of the terminal 1, housing 2, and nut 4 are described below. The terminal 1 is a stepped cylinder, axially divided into at least a first section 11 and a second section 12, wherein the diameter of the first section 11 is smaller than the diameter of the second section 12. The first section 11 enters from the bottom of the sealing body 7 and exits from the top of the sealing body 7. The upper surface of the second section 12 is in contact with the bottom surface of the sealing body 7. (See attached diagram.) Figure 3 The nut 4 has a through stepped hole 13, which is axially divided into a first hole portion 14 and a second hole portion 15. The diameter of the second hole portion 15 is larger than the diameter of the first hole portion 14, and the inner wall of the first hole portion 14 is provided with an internal thread for connection with the pole post 1. The diameter of the second hole portion 15 is larger than the diameter of the first portion 11. The end face of the second hole portion 15 is in contact with the first sealing surface 8 of the sealing body 7 to achieve the first layer of sealing.

[0032] See attached document Figure 4 The outer casing 2 is provided with a recess 17, which is circular and concentric with the opening 3. The end face of the recess 17 is in contact with the second sealing surface 9, and the interior of the outer casing 2 is in contact with the third sealing surface 10. Thus, a double seal is formed between the sealing body 7 and the outer casing 2.

[0033] To standardize the installation of the sealing body 7 during assembly, specific limitations need to be imposed on the sealing length and compression of each sealing surface in the sealing body 7. Specifically: the single-sided sealing length of the first sealing surface 8 is defined as L1, where L1 ≥ 0.5 mm; the single-sided sealing length of the second sealing surface 9 and the third sealing surface 10 is defined as L2, where L2 ≥ 0.9 mm; the compression of the first sealing surface 8 is defined as A, where 10% ≤ A ≤ 45%; the compression of the second sealing surface 9 and the third sealing surface 10 is defined as B, where 15% ≤ B ≤ 45%. The compression mentioned above refers to the ratio of the compression depth to the height of each sealing surface. The compression depth is referenced in the appendix. Figure 5 The height of the sealing surface (h) is referenced in the appendix. Figure 5 H in the middle.

[0034] It should be noted that the terms "first", "second", "third" are only used to distinguish various technical features, and cannot be understood as indicating or implying; the terms "inner", "outer", "upper", "lower" and the like indicate the orientation or positional relationship shown in the drawings, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, therefore it cannot be understood as a limitation on the present application.

[0035] The above is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An electric cell with a multi-layer sealing structure, comprising, a pole (1); a shell (2) provided with an opening (3) for the pole (1) to pass through from inside to outside; a nut (4) connected with the part of the pole (1) extending out of the shell (2); a first insulator (5) distributed outside the shell (2) and arranged between the nut (4) and the opposite end face of the shell (2); a second insulator (6) distributed inside the shell (2) and arranged between the pole (1) and the opposite end face of the shell (2); characterized in that, further comprising: a sealing body (7) having three sealing surfaces in the first direction, respectively defined as a first sealing surface (8), a second sealing surface (9) and a third sealing surface (10), the first sealing surface (8) being in contact with one end face of the nut (4), the second sealing surface (9) being in contact with one end face of the shell (2), and the third sealing surface (10) being in contact with the other end face of the shell (2).

2. The battery cell having a multi-layered seal structure according to claim 1, wherein, The sealing body (7) is in the shape of a stepped cylinder, the top surface of the sealing body (7) forms the first sealing surface (8), the first stepped surface of the sealing body (7) forms the second sealing surface (9), and the second stepped surface of the sealing body (7) forms the third sealing surface (10).

3. The battery cell having a multi-layered seal structure of claim 2, wherein, The pole (1) is in the shape of a stepped cylinder, and is divided into at least a first part (11) and a second part (12) in the axial direction, the first part (11) passes through the sealing body (7), and the second part (12) is arranged inside the shell (2), the upper surface of the second part (12) being in contact with the bottom surface of the sealing body (7).

4. The battery cell having a multi-layered seal structure of claim 3, wherein, The nut (4) is provided with a stepped hole (13) passing through, the stepped hole (13) is divided into a first hole part (14) and a second hole part (15) in the axial direction in sequence, the inner wall of the first hole part (14) is provided with an internal thread for connecting with the pole (1), the end face of the second hole part (15) is in contact with the first sealing surface (8) of the sealing body (7), and the diameter of the second hole part (15) is greater than that of the first part (11).

5. The battery cell having a multi-layered seal structure of claim 3, wherein, The shell (2) is provided with a recess (17) concentrically arranged with the opening (3), the end face of the recess (17) is in contact with the second sealing surface (9), and the inner wall of the shell (2) is in contact with the third sealing surface (10).

6. The battery cell having a multi-layered seal structure of claim 1, wherein, The unilateral sealing length of the first sealing surface (8) is defined as L1, wherein L1≥0.5mm; and the unilateral sealing length of the second sealing surface (9) and the third sealing surface (10) is defined as L2, wherein L2≥0.9mm.

7. The battery cell having a multi-layered seal structure of claim 1, wherein, The compression amount of the first sealing surface (8) is defined as A, wherein 10%≤A≤45%; and the compression amount of the second sealing surface (9) and the compression amount of the third sealing surface (10) are defined as B, wherein 15%≤B≤45%.

8. The battery cell having a multi-layered seal structure of claim 1, wherein, The sealing body (7) is made of EPDM or FKM.

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