Battery cell cover plate and assembly thereof

Abstract

This utility model relates to a battery cell assembly, and more particularly to a battery cell cover plate and its assembly. The battery cell cover plate assembly includes a battery cell cover plate, terminals, an insulating ring, a compression sealing ring, a pressure ring, and an insulating sheet. The battery cell cover plate has a mounting hole penetrating its opposite sides at its center, and a bent flange is formed at the edge of the battery cell cover plate. One opposite side of the battery cell cover plate is defined as side A, and the other opposite side is defined as side B. A concave portion is formed on side A of the battery cell cover plate by the bent flange, and a convex portion is formed on side B of the battery cell cover plate by bending. The battery cell cover plate and its assembly disclosed in this utility model improve the strength of the weld joint by reducing thermal stress deformation during the welding process.

Description

Technical Field

[0001] This utility model relates to a battery cell assembly, and more particularly to a battery cell cover plate and its assembly. Background Technology

[0002] As a widely used commercial battery product, lithium-ion batteries have always faced challenges in ensuring reliable sealing, electrical connections, and insulation of the battery and its cells. Existing cover plate structures are prone to thermal stress during welding for sealing and electrical connections, affecting the strength of the seal and the cover plate. Furthermore, the complex external electrical connection structure of the cover plate results in a long current output path, which is detrimental to current transmission. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, this utility model provides a battery cell cover plate and its components.

[0004] One of the objectives of this utility model is to provide a battery cell cover plate, wherein the center of the battery cell cover plate is provided with mounting holes that pass through its opposite sides, and a bend and flange are provided at the edge of the battery cell cover plate; one opposite side of the battery cell cover plate is defined as side A, and the other opposite side of the battery cell cover plate is defined as side B; a concave part is formed on side A of the battery cell cover plate by bending and flange, and a convex part is formed on side B of the battery cell cover plate by bending.

[0005] Preferably, the cell cover is circular, and the mounting hole is a circular hole.

[0006] The second objective of this utility model is to provide a battery cell cover assembly, comprising: The aforementioned cell cover plate; terminal; An insulating ring, which is used to isolate electrical contact between the terminal and the cell cover plate; A compression sealing ring is used to seal the gap between the terminal and the insulating ring; A pressure ring, used to fix the extruded sealing ring; An insulating sheet is attached to the inside of the cell cover plate.

[0007] Furthermore, the insulating sheet is provided with a groove that mates with the bent flange.

[0008] Furthermore, the terminal is provided with a slot, the portion of the terminal located in the upper part of the slot is defined as the first part, and the portion of the terminal located in the lower part of the slot is defined as the second part. The insulating ring extends from the outer surface of the first part to the outer surface of the second part, and the edge of the cell cover plate with the mounting hole extends into the slot and contacts the insulating ring.

[0009] Preferably, both the compression sealing ring and the pressure ring are installed in the slot. Preferably, the terminal has injection holes that extend through opposite sides.

[0010] Preferably, the back of the insulating sheet is provided with reinforcing ribs.

[0011] This utility model has the following technical effects: 1. A special structural bending design is adopted for the cell cover plate to improve the thermal stress deformation during the welding process, thereby increasing the strength of the welded joint of the cell cover plate.

[0012] 2. Perform structural integration design on the cell cover assembly. In response to the structural changes of the cell cover, optimize the remaining components in the cell cover assembly to optimize the structure. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the battery cell cover assembly. Figure 2 A cross-sectional view of the assembled battery cell cover assembly; Figure 3 This is a schematic diagram of the battery cell cover plate. Figure 4 This is a schematic diagram of the terminal structure; Figure 5 This is a schematic diagram of the front structure of the insulating sheet; Figure 6 This is a schematic diagram of the structure on the back of the insulating sheet; Figure 7 For the appendix Figure 2 Enlarged view of the structure of section C.

[0014] In the diagram: 100. Cell cover plate; 101. Mounting hole; 102. Bending flange; 103. Recess; 104. Protrusion; 200. Terminal; 201. Slot; 202. First part; 203. Second part; 204. Injection hole; 300. Insulating ring; 400. Extrusion sealing ring; 500, pressure ring; 600, Insulating sheet; 601, Groove; 602, Reinforcing rib; Detailed Implementation

[0015] The following is in conjunction with the appendix Figure 1 To be continued Figure 7 The embodiments describe the principles and features of this utility model; the examples are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0016] Example 1 This embodiment provides a battery cell cover plate. The battery cell cover plate 100 has mounting holes 101 extending through its opposite sides at its center. One opposite side of the battery cell cover plate 100 is defined as side A, and the other opposite side is defined as side B. See attached drawing for details. Figure 3 Side A faces outwards from the battery cell, and side B faces inwards from the battery cell. In this embodiment, the battery cell cover 100 is circular. In other preferred embodiments, the battery cell cover 100 can also be designed in common shapes, such as elliptical or square, and the mounting hole 101 is also circular. A bent flange 102 is provided at the edge of the battery cell cover 100. The design of the bent flange 102 can improve the thermal deformation generated during welding, thereby improving the strength of the weld. A recess 103 is formed on side A of the battery cell cover 100 by the bent flange 102, and a protrusion 104 is formed on side B of the battery cell cover 100 by bending.

[0017] Example 2 This embodiment provides a cell cover plate assembly, including the cell cover plate 100, terminal 200, insulating ring 300, extrusion sealing ring 400, pressure ring 500 and insulating sheet 600 as in Embodiment 1.

[0018] Terminal 200 serves as the negative terminal of the battery. Terminal 200 has an injection hole 204 extending through both opposite sides. Electrolyte is injected into the cell through the injection hole 204 and then sealed with a sealing injection pin. Terminal 200 is cylindrical and has a slot 201 that divides the terminal into a first part 202 and a second part 203. The part located on the upper side of the slot 201 is the first part 202, and the part located on the lower side of the slot 201 is the second part 203.

[0019] From the axial cross-sectional view of the insulating ring 300, its single-sided shape is Z-shaped, extending from the cylindrical surface of the first part 202 to the cylindrical surface of the slot 201. The terminal 200 passes through the mounting hole 101 of the cell cover plate 100, and the edge of the terminal 200 near the mounting hole 101 extends into the slot 201 and contacts the insulating ring 300, thereby preventing direct contact between the cell cover plate 100 and the terminal 200. That is, the insulating ring 300 serves to isolate the terminal 200 and the cell cover plate 100 from electrical contact.

[0020] The insulating sheet 600 is also circular, with its upper surface conforming to the lower surface (i.e., the inner side) of the cell cover plate 100. A groove 601 is provided on the insulating sheet 600 to mate with the bent flange 102. "Upper" refers to the side facing outwards from the cell; "lower" refers to the side facing inwards from the cell. Reinforcing ribs 602 are provided on the back (i.e., the inner side) of the insulating sheet 600. These reinforcing ribs 602 are both circular and straight. The circular reinforcing ribs 602 are arranged in an array centered on the center of the insulating sheet 600, while the straight reinforcing ribs 602 extend radially along the insulating sheet 600. The design of the reinforcing ribs 602 allows the insulating sheet 600 to provide mechanical strength while minimizing weight.

[0021] The compression sealing ring 400 is installed into the slot 201. The upper surface of the compression sealing ring 400 is abutted against the lower surface of the cell cover plate, and the inner side of its central hole is abutted against the inner side of the slot 201. Therefore, the compression sealing ring 400 is used to seal the gap between the terminal 200 and the insulating ring 300, that is, to seal the inside of the cell. The insulating sheet 600 is abutted against the inner side of the cell cover plate 100 and installed in the slot 201. Generally speaking, the compression sealing ring 400 is made of an elastic material (such as rubber), and the insulating sheet 600 can compress and fix the compression sealing ring 400 in the slot 201.

[0022] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An electrode cover plate, characterized by, The battery cell cover (100) has a mounting hole (101) through its opposite sides at its center, and a bend flange (102) is provided at the edge of the battery cell cover (100); one side of the battery cell cover (100) is defined as side A, and the other side of the battery cell cover (100) is defined as side B. A recess (103) is formed on side A of the battery cell cover (100) by the bend flange (102), and a protrusion (104) is formed on side B of the battery cell cover (100) by bending.

2. The cell cover plate according to claim 1, characterized in that, The cell cover plate (100) is circular, and the mounting hole (101) is a circular hole.

3. An electrochemical cell cover plate assembly, comprising: include: The cell cover plate (100) according to any one of claims 1 to 2; terminal(200); An insulating ring (300) is used to isolate the electrical contact between the terminal (200) and the cell cover plate (100); A compression sealing ring (400) is used to seal the gap between the terminal (200) and the insulating ring (300); A pressure ring (500) is used to fix the extrusion seal ring (400). An insulating sheet (600) is attached to the inside of the cell cover plate (100).

4. The cell cover plate assembly of claim 3, wherein, The insulating sheet (600) is provided with a groove (601) that cooperates with the bent flange (102).

5. The cell cover plate assembly of claim 3, wherein, The terminal (200) is provided with a slot (201), the portion of the terminal (200) located in the upper part of the slot is defined as the first part (202), and the portion of the terminal (200) located in the lower part of the slot is defined as the second part (203). The insulating ring (300) extends from the outer surface of the first part (201) to the outer surface of the second part (203). The edge of the battery cell cover plate (100) with the mounting hole (101) extends into the slot (201) and contacts the insulating ring (300).

6. The cell cover plate assembly of claim 5, wherein, The compression sealing ring (400) and the pressure ring (500) are both installed in the slot (201).

7. The cell cover plate assembly of claim 3, wherein, The terminal (200) has a liquid injection hole (204) that extends through both opposite sides.

8. The cell cover plate assembly of claim 3, wherein, The back of the insulating sheet (600) is provided with reinforcing ribs (602).

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