Insulation sealing structure of square battery cover plate pole

Abstract

The utility model discloses an insulated sealing structure for a square battery cover plate and a pole. The insulated sealing structure comprises a battery cover plate and an electrode terminal assembly, the sealing assembly is arranged at the joint of the electrode terminal assembly and the battery cover plate; the sealing assembly comprises an upper plastic part and a lower plastic part, and a sealing ring is installed between the upper plastic part and the lower plastic part. And the electrode terminal assembly forms an insulation sealing structure through the connection among the upper plastic part, the sealing ring and the lower plastic part. According to the insulation sealing structure disclosed by the utility model, the plastic part is matched with the sealing ring, so that the risk of short circuit between the pole terminal and the cover plate can be reduced, and the safety of the whole battery shell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium-ion batteries, in particular to an insulating and sealing structure of a square battery cover plate pole. Background Art

[0002] Lithium-ion batteries are widely used in the fields of power and energy storage. In the existing battery monomer structure, the battery consists of a shell, a top cover and a cell assembly inside the shell. The cell assembly is connected to the pole terminal on the cover through the pole ear, and the pole terminal is insulated from the cover by plastic to ensure the insulation of the cell shell.

[0003] The plastic parts between the pole and the cover plate have no fool-proof structure. The metal wires or metal particles in the production and assembly process will overlap the pole and the cover plate to conduct electricity, forming a primary battery on the cover plate to produce electrochemical corrosion, and reducing the insulation and sealing of the plastic parts between the pole and the cover plate.

[0004] Therefore, based on the above technical problems, technicians in this field urgently need to develop a square battery cover plate pole insulation sealing structure. Utility Model Content

[0005] The utility model aims to provide a square battery cover plate pole insulating sealing structure, which can reduce the risk of short circuit between the pole terminal and the cover plate and improve the safety of the entire battery shell.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The utility model discloses a square battery cover plate pole insulation sealing structure, which comprises:

[0008] Battery cover and electrode terminal assembly; and

[0009] A sealing assembly provided at the connection between the electrode terminal assembly and the battery cover plate;

[0010] The sealing assembly comprises:

[0011] An upper plastic part and a lower plastic part, wherein a sealing ring is installed between the upper plastic part and the lower plastic part;

[0012] The electrode terminal assembly forms an insulating sealing structure through the connection between the upper plastic part, the sealing ring and the lower plastic part.

[0013] Further, the electrode terminal assembly is divided into a positive terminal and a negative terminal;

[0014] The positive terminal has a positive pole post and a positive pin;

[0015] The negative terminal has a negative pole post and a negative pin;

[0016] The positive electrode pin and the negative electrode pin are respectively connected to the lower parts of the two ends of the lower plastic part;

[0017] The positive electrode column and the negative electrode column are both installed on the two ends of the battery cover through the sealing assembly.

[0018] Furthermore, the lower plastic part is configured as a structure matching the size of the battery cover;

[0019] The battery cover plate and both ends of the lower plastic part, as well as the corresponding pins, are provided with pole holes;

[0020] The negative electrode pole and the positive electrode pole are installed in the pole holes on both sides respectively;

[0021] The upper plastic part is installed on the corresponding pole, and the sealing ring is installed between the upper plastic part and the corresponding pole;

[0022] A pole riveting block is installed on the upper plastic part.

[0023] Furthermore, a step portion is formed at the matching position between the upper plastic part and the head of the sealing ring, and the upper plastic part presses the head of the sealing ring through the step portion;

[0024] The matching position between the lower plastic part and the skirt of the sealing ring has a first inclined surface. When the skirt of the sealing ring is squeezed by the battery cover and the corresponding pole, the compressed skirt of the sealing ring contacts the first inclined surface of the lower plastic part.

[0025] Furthermore, a second inclined surface is provided on the upper plastic part near the head of the sealing ring, the head of the sealing ring extends to the upper part of the upper plastic part and contacts the pole riveting block, and the head of the sealing ring contacts the second inclined surface after being compressed by the pole riveting block;

[0026] The matching position between the lower plastic part and the skirt of the sealing ring has a first inclined surface. When the skirt of the sealing ring is squeezed by the battery cover and the corresponding pole, the compressed skirt of the sealing ring contacts the first inclined surface of the lower plastic part.

[0027] Furthermore, a step portion is formed at the matching position between the upper plastic part and the head of the sealing ring, and the upper plastic part presses the head of the sealing ring through the step portion;

[0028] The lower plastic part is partially embedded in the annular groove of the battery cover, and the skirt of the sealing ring is located below the lower plastic part and is pressed by the lower plastic part.

[0029] In the above technical solution, the utility model provides a square battery cover plate pole insulation sealing structure, which has the following beneficial effects:

[0030] The insulating sealing structure of the utility model can reduce the risk of short circuit between the pole terminal and the cover plate and improve the safety of the entire battery housing through the cooperation of the plastic part and the sealing ring.

[0031] The insulating sealing structure of the utility model increases the compression area of ​​the sealing ring by squeezing the head and skirt of the sealing ring, thereby improving the sealing performance of the battery cell shell, reducing the risk of leakage of the pole cover, and improving the safety and stability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0033] Figure 1 A schematic structural diagram of a square battery cover plate pole insulation sealing structure disclosed in an embodiment of the present application;

[0034] Figure 2 It is a structural explosion diagram of a square battery cover plate pole insulation sealing structure disclosed in an embodiment of the present application;

[0035] Figure 3 A schematic structural diagram of a sealing assembly of a first embodiment of a square battery cover plate pole insulation sealing structure disclosed in an embodiment of the present application;

[0036] Figure 4 A schematic structural diagram of a sealing assembly of a second embodiment of a square battery cover plate pole insulation sealing structure disclosed in an embodiment of the present application;

[0037] Figure 5 This is a schematic structural diagram of a sealing assembly of a third embodiment of a square battery cover plate pole insulation sealing structure disclosed in an embodiment of the present application.

[0038] Description of reference numerals:

[0039] 1. Electrode terminal assembly; 2. Battery cover; 3. Sealing assembly;

[0040] 101, positive electrode pin; 102, negative electrode pin; 103, positive electrode post; 104, negative electrode post;

[0041] 201. explosion-proof valve; 202. explosion-proof valve protective film;

[0042] 301, upper plastic part; 302, lower plastic part; 303, sealing ring; 304, pole riveting block;

[0043] 401, step portion; 402, first inclined surface; 403, second inclined surface; 404, annular groove. DETAILED DESCRIPTION

[0044] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0045] See also Figures 1 to 5 As shown;

[0046] This embodiment discloses a square battery cover plate pole insulation sealing structure, which includes:

[0047] A battery cover plate 2 and an electrode terminal assembly 1; and

[0048] A sealing assembly 3 provided at the connection between the electrode terminal assembly 1 and the battery cover plate 2;

[0049] The sealing assembly 3 comprises:

[0050] An upper plastic part 301 and a lower plastic part 302 , with a sealing ring 303 installed between the upper plastic part 301 and the lower plastic part 302 ;

[0051] The electrode terminal assembly 1 forms an insulating sealing structure through the connection between the upper plastic part 301 , the sealing ring 303 and the lower plastic part 302 .

[0052] Specifically, this embodiment discloses an insulating sealing structure between a pole terminal and a battery cover plate 2. First, a sealing assembly 3 is arranged between the battery cover plate 2 and the electrode terminal assembly 1, wherein the sealing assembly 3 of this embodiment is mainly composed of a plastic part and a sealing ring 303, specifically including an upper plastic part 301, a lower plastic part 302 and a sealing ring 303. And the head and skirt of the sealing ring 303 are pressed by the plastic part to achieve an insulating sealing effect.

[0053] Preferably, the electrode terminal assembly 1 of this embodiment is divided into a positive terminal and a negative terminal;

[0054] The positive terminal has a positive pole 103 and a positive pin 101;

[0055] The negative terminal has a negative pole 104 and a negative pin 102;

[0056] The positive pin 101 and the negative pin 102 are respectively connected to the lower parts of both ends of the lower plastic part 302;

[0057] The positive electrode column 103 and the negative electrode column 104 are both installed at both ends of the battery cover plate 2 through the sealing assembly 3.

[0058] Preferably, the lower plastic part 302 of this embodiment is configured to be a structure that matches the size of the battery cover 2; both ends of the battery cover 2 and the lower plastic part 302, as well as the corresponding pins, are provided with pole holes;

[0059] The negative pole 104 and the positive pole 103 are installed in the pole holes on both sides respectively;

[0060] The upper plastic part 301 is installed on the corresponding pole, and a sealing ring 303 is installed between the upper plastic part 301 and the corresponding pole;

[0061] A pole riveting block 304 is mounted on the upper plastic part 301 .

[0062] Embodiment 1:

[0063] See also Figure 3 As shown, Figure 3 The structure and insulating sealing principle of the first sealing assembly 3 of the present application are shown.

[0064] The upper plastic part 301 of the first embodiment forms a step portion 401 at the matching position with the head of the sealing ring 303, and the upper plastic part 301 presses the head of the sealing ring 303 through the step portion 401;

[0065] The matching position of the lower plastic part 302 and the skirt of the sealing ring 303 has a first inclined surface 402. When the skirt of the sealing ring 303 is squeezed by the battery cover 2 and the corresponding pole, the compressed skirt of the sealing ring 303 contacts the first inclined surface 402 of the lower plastic part 302.

[0066] First, the structure and principle of the sealing assembly 3 disclosed in the first embodiment of the present invention are as follows: a step portion 401 is provided at the position where the upper plastic part 301 cooperates with the sealing ring 303, and the step portion 401 is used to press the head of the sealing ring 303 for compression and positioning; the lower plastic part 302 is provided with a first inclined surface 402, and the skirt of the sealing ring 303 is compressed by the battery cover 2 and the corresponding pole and contacts the first inclined surface 402 of the lower plastic part 302, thereby the upper plastic part 301, the sealing ring 303 and the lower plastic part 302 are interconnected to form a complete sealed insulating structure.

[0067] Embodiment 2:

[0068] See also Figure 4 As shown, Figure 4 The structure and insulating sealing principle of the second sealing assembly 3 of the present application are shown.

[0069] The upper plastic part 301 of the second embodiment is provided with a second inclined surface 403 near the head of the sealing ring 303. The head of the sealing ring 303 extends to the upper part of the upper plastic part 301 and contacts the pole riveting block 304. The head of the sealing ring 303 is compressed by the pole riveting block 304 and contacts the second inclined surface 403.

[0070] The matching position of the lower plastic part 302 and the skirt of the sealing ring 303 has a first inclined surface 402. When the skirt of the sealing ring 303 is squeezed by the battery cover 2 and the corresponding pole, the compressed skirt of the sealing ring 303 contacts the first inclined surface 402 of the lower plastic part 302.

[0071] The structure and principle of the sealing assembly 3 of the second embodiment are as follows: a second inclined surface 403 is provided on the pole hole of the upper plastic part 301, and at the same time, a second inclined surface 403 is provided on the lower plastic part 302, and at the same time, the head of the sealing ring 303 extends upward and contacts the pole riveting block 304, and deforms under the pressure of the pole riveting block 304 to contact the second inclined surface 403. At the same time, the skirt of the sealing ring 303 is also deformed under the pressure of the battery cover 2 and the corresponding pole and contacts the first inclined surface 402. Thus, the upper plastic part 301, the sealing ring 303 and the lower plastic part 302 are connected to each other and form a complete sealed insulation structure.

[0072] Embodiment three:

[0073] See also Figure 5 As shown, Figure 5 The structure and insulating sealing principle of the third sealing assembly 3 of the present application are shown.

[0074] The upper plastic part 301 of the third embodiment forms a step portion 401 at the matching position with the head of the sealing ring 303, and the upper plastic part 301 presses the head of the sealing ring 303 through the step portion 401;

[0075] The lower plastic part 302 is partially embedded in the annular groove 404 of the battery cover 2 , and the skirt of the sealing ring 303 is located below the lower plastic part 302 and is pressed by the lower plastic part 302 .

[0076] The structure and principle of the sealing assembly 3 of the third embodiment of the present invention are as follows: first, the upper plastic part 301 uses the step portion 401 to press the head of the sealing ring 303 to limit the position. At the same time, an annular groove 404 is provided under the battery cover 2 of the third embodiment of the present invention, and a part of the lower plastic part 302 of the third embodiment of the present invention is embedded in the annular groove 404 and is flush with the outside of the annular groove 404 of the battery cover 2. The skirt of the sealing ring 303 is located below the lower plastic part 302. In this form, the upper plastic part 301, the sealing ring 303 and the lower plastic part 302 are interconnected to form a complete sealed insulating structure.

[0077] In the above technical solution, the utility model provides a square battery cover plate pole insulation sealing structure, which has the following beneficial effects:

[0078] The insulating sealing structure of the utility model can reduce the risk of short circuit between the pole terminal and the cover plate and improve the safety of the entire battery housing through the cooperation of the plastic part and the sealing ring 303.

[0079] The insulating sealing structure of the utility model increases the compression area of ​​the sealing ring 303 by squeezing the head and skirt of the sealing ring 303, thereby improving the sealing of the battery cell shell, reducing the risk of leakage of the pole cover, and improving the safety and stability of the battery.

[0080] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A square battery cover plate pole insulation sealing structure, characterized in that: The structure includes: A battery cover plate (2) and an electrode terminal assembly (1); and A sealing assembly (3) provided at the connection between the electrode terminal assembly (1) and the battery cover plate (2); The sealing assembly (3) comprises: An upper plastic part (301) and a lower plastic part (302), wherein a sealing ring (303) is installed between the upper plastic part (301) and the lower plastic part (302); The electrode terminal assembly (1) forms an insulating sealing structure through the connection between the upper plastic part (301), the sealing ring (303) and the lower plastic part (302).

2. A square battery cover plate pole insulation sealing structure according to claim 1, characterized in that: The electrode terminal assembly (1) is divided into a positive terminal and a negative terminal; The positive terminal comprises a positive pole (103) and a positive pin (101); The negative terminal comprises a negative pole post (104) and a negative pin (102); The positive electrode pin (101) and the negative electrode pin (102) are respectively connected to the lower parts of both ends of the lower plastic part (302); The positive electrode column (103) and the negative electrode column (104) are both mounted on the two ends of the battery cover plate (2) via the sealing assembly (3).

3. A square battery cover plate pole insulation sealing structure according to claim 2, characterized in that: The lower plastic part (302) is configured to have a structure that matches the size of the battery cover (2); Both ends of the battery cover plate (2) and the lower plastic part (302), as well as the corresponding pins, are provided with pole holes; The negative electrode pole (104) and the positive electrode pole (103) are correspondingly installed in the pole holes on both sides; The upper plastic part (301) is installed on the corresponding pole, and the sealing ring (303) is installed between the upper plastic part (301) and the corresponding pole; A pole riveting block (304) is mounted on the upper plastic part (301).

4. A square battery cover plate pole insulation sealing structure according to claim 3, characterized in that: A step portion (401) is formed at the matching position between the upper plastic part (301) and the head of the sealing ring (303), and the upper plastic part (301) presses the head of the sealing ring (303) through the step portion (401); The matching position between the lower plastic part (302) and the skirt of the sealing ring (303) has a first inclined surface (402); when the skirt of the sealing ring (303) is squeezed by the battery cover (2) and the corresponding pole, the compressed skirt of the sealing ring (303) contacts the first inclined surface (402) of the lower plastic part (302).

5. The square battery cover plate pole insulation sealing structure according to claim 3, characterized in that: A second inclined surface (403) is provided at a position of the upper plastic part (301) close to the head of the sealing ring (303); the head of the sealing ring (303) extends to the upper part of the upper plastic part (301) and contacts the pole riveting block (304); and the head of the sealing ring (303) contacts the second inclined surface (403) after being compressed by the pole riveting block (304); The matching position between the lower plastic part (302) and the skirt of the sealing ring (303) has a first inclined surface (402); when the skirt of the sealing ring (303) is squeezed by the battery cover (2) and the corresponding pole, the compressed skirt of the sealing ring (303) contacts the first inclined surface (402) of the lower plastic part (302).

6. A square battery cover plate pole insulation sealing structure according to claim 3, characterized in that: A step portion (401) is formed at the matching position between the upper plastic part (301) and the head of the sealing ring (303), and the upper plastic part (301) presses the head of the sealing ring (303) through the step portion (401); The lower plastic part (302) is partially embedded in the annular groove (404) of the battery cover (2), and the skirt of the sealing ring (303) is located below the lower plastic part (302) and is pressed by the lower plastic part (302).

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