Unilaterally sealed battery structure

Abstract

The utility model relates to a battery structure, especially a single side sealed battery structure, including shell, electric core and positive pole assembly, the shell is empty cavity structure and single side opening, the electric core is fixed to the empty cavity of shell, and the positive pole current collector is connected to the opening end of shell close to the electric core, the positive pole assembly is connected to the opening end of shell, and the shell is closed. The utility model discloses a single side sealed battery structure, improves the sealing performance, and simplifies the battery structure.

Description

Technical Field

[0001] This utility model relates to a battery structure, and more particularly to a battery structure with a single-sided seal. Background Technology

[0002] Lithium-ion batteries are currently the most widely used commercial battery products. The reliability of battery and cell sealing, electrical connection, thermal safety, and structural optimization have always been key concerns for designers and developers. While there has been research on reliable sealing, electrical connection, and thermal safety in the industry, these technical effects are mainly achieved by improving the sealing structure or adding explosion-proof valves. However, improvements to the overall structure have been less frequent. Current cell structures generally consist of a casing, cell, positive electrode assembly, and negative electrode assembly. During assembly, the battery is flipped after the positive electrode assembly is completed before assembling the negative electrode assembly, making the assembly process somewhat complex.

[0003] Therefore, improvements are needed to the existing battery structure. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a battery structure with a single-sided seal.

[0005] To achieve the above objectives, this utility model discloses a single-sided sealed battery structure, comprising: The outer shell is a cavity structure with an opening on one side; The battery cell is fixed to the cavity of the outer casing, and a positive current collector is connected to the open end of the battery cell near the outer casing. A positive electrode assembly, which is connected to the opening of the housing to close the housing.

[0006] Preferably, the positive electrode assembly includes a cover plate, a positive terminal, an upper insulating ring, a sealing ring, and a retaining ring; the cover plate is fixedly connected to the opening side of the housing; the positive terminal passes through the cover plate, one end of the positive terminal extends into the housing and is fixed to the positive current collector, and the other end of the positive terminal extends out of the housing; the upper insulating ring engages with the positive terminal to electrically isolate the positive terminal from one side of the cover plate; the sealing ring engages with the positive terminal to electrically isolate the positive terminal from the other side of the cover plate; the retaining ring is used to press and fix the sealing ring and the upper insulating ring.

[0007] Preferably, the positive electrode assembly further includes a sealing pin, and the positive terminal is provided with a through injection hole. The sealing pin is connected to the injection hole to seal the injection hole.

[0008] Preferably, the positive electrode assembly further includes a lower insulating sheet, which is disposed between the battery cell and the inner wall of the outer casing.

[0009] Preferably, a groove is provided at the other end of the opening of the outer shell, and the cross-section of the groove is triangular.

[0010] Preferably, the outer shell further comprises a protrusion extending inward, the protrusion being in the shape of concentric rings; the diameters of the central circles of two adjacent rings are defined as follows: and , Define the width of each ring as L1, where L1 = (1~10) mm.

[0011] Preferably, the thickness of the outer shell gradually increases at the end near the opening, and the maximum thickness of the outer shell is defined as d1, and the thickness of the uniform part of the outer shell is defined as d2, where d1 = d2 + (0.05~025mm).

[0012] Preferably, a boss protruding towards one end of the opening is provided at the center of the positive current collector.

[0013] This utility model has the following technical effects: The structure is a single-sided sealing structure. Compared with the common double-sided sealing, its advantages are: (1) good sealing performance, only the sealing of the positive electrode component connection needs to be considered; (2) simplified assembly process, since only one side needs to be assembled, the assembly efficiency is higher than that of assembling both sides; (3) simplified structure, reducing the number of parts. Attached Figure Description

[0014] Figure 1 This is a first-view structural schematic diagram of the present invention; Figure 2 This is a structural schematic diagram of the present invention from a second perspective; Figure 3 This is a cross-sectional view of the structure of this utility model; Figure 4 For the appendix Figure 3 Enlarged view of the structure at point A in the middle; Figure 5 This is a schematic diagram of the outer shell structure; Figure 6 for Figure 5 Enlarged view of the structure at point B; Figure 7 for Figure 5 Enlarged view of the structure at point C; Figure 8 A schematic diagram of the structure at the scoring area on the outer shell; Figure 9 This is a schematic diagram of the positive electrode current collector.

[0015] In the diagram, 100. Casing; 200. Battery cell; 300. Positive electrode assembly; 400. Positive electrode current collector; 101. Scratches; 102. Raised parts; 301. Cover plate; 302. Positive terminal; 303. Upper insulating ring; 304. Sealing ring; 305. Snap ring; 306. Sealing pin; 307. Lower insulating sheet; 401. convex surface. Detailed Implementation

[0016] The principles and features of this utility model are described below with reference to the embodiments; the examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0017] A single-sided sealed battery structure includes a casing 100, a cell 200, and a positive electrode assembly 200.

[0018] The outer shell 100 is a thin-walled cylindrical structure with an internal cavity and an opening at one end of the cavity. The positive electrode assembly 300 is laser-welded to the opening of the outer shell 100, sealing the opening. It should be noted that the thickness of the outer shell 100 gradually increases towards the opening; the maximum thickness of the outer shell 100 is defined as d1, and the thickness at a uniform point is defined as d2, where d1 = d2 + (0.05~0.25 mm). This design has two main purposes: (i) to improve the strength at the opening of the outer shell 100; and (ii) since the opening is the welding point to the positive electrode assembly 200, a larger wall thickness of the outer shell 100 here ensures welding quality and strength at the welding point. A protrusion 102 protruding into the outer shell 100 is provided at the end of the outer shell 100 furthest from the opening. The protrusion 102 is in the shape of concentric rings; in this embodiment, two rings are designed, and the diameter of the central circle of the larger ring is defined as... Define the diameter of the central circle of the small annulus as... ,in Size is 26~36mm, The size is 5~10mm, and the width of the ring is defined as L1, where the width of the large ring is 4~10mm and the width of the small ring is 1~4mm. and The size is limited primarily to ensure the current requirements of the welding area at that location, increase the strength of the bottom of the housing 100, and ensure the reliability of the contact. A circular notch 101 is provided at the same end of the housing 100. The cross-section of the notch 101 is triangular, and the notch 101 is an explosion-proof structure.

[0019] The bottom of the battery cell 200 is fixed to the closed end of the cavity of the housing 100 by laser welding. A positive current collector 400 is welded to the open end of the battery cell 200 near the housing 100. A boss 401 protruding towards the open end is provided at the center of the positive current collector 400. The boss 401 can ensure the firmness of the welding between the positive current collector 400 and the battery cell 200.

[0020] Specifically, the positive electrode assembly 300 includes a cover plate 301, a positive terminal 302, an upper insulating ring 303, a sealing ring 304, a retaining ring 305, a sealing pin 306, and a lower insulating sheet 307. The edge of the cover plate 301 is fixed to the opening of the housing 100 by welding. The positive terminal 302 is cylindrical and has a through-hole for liquid injection. The sealing pin 306 is fixed to the liquid injection hole of the positive terminal 302 by welding. The upper insulating ring 303 engages with the positive terminal 302. A groove is provided in the axial middle of the positive terminal 302. The cross-section of the upper insulating ring 303 is Z-shaped, and the upper insulating ring 303 extends from the upper part of the groove to the groove. The upper insulating ring 303 is used to electrically isolate the positive terminal 302 from the upper surface of the cover plate 301. One end of the positive terminal 302 extends into the housing 100 and is fixed to the positive current collector 400, while the other end extends out of the housing 100. A sealing ring 304 engages with the positive terminal 302 to electrically isolate it from the other side of the cover plate 301. A retaining ring 305 is used to press and fix the sealing ring 304 and the upper insulating ring 303. A lower insulating sheet 307 is disposed between the battery cell 200 and the inner wall of the housing 100.

[0021] 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. A battery structure with a single-sided seal, characterized in that, include: The outer shell (100) has a cavity structure and is open on one side; A battery cell (200) is fixed in the cavity of a housing (100), and a positive current collector (400) is connected to the open end of the battery cell (200) near the housing (100). A positive electrode assembly (300) is connected to the open end of the housing (100) to close the housing (100).

2. The single-sided sealed battery structure according to claim 1, characterized in that, The positive electrode assembly (300) includes a cover plate (301), a positive terminal (302), an upper insulating ring (303), a sealing ring (304), and a retaining ring (305); the cover plate (301) is fixedly connected to the opening side of the housing (100); the positive terminal (302) passes through the cover plate (301), one end of the positive terminal (302) extends into the housing (100) and is fixed to the positive current collector (400), the positive terminal (302) The other end of the upper insulating ring (303) extends to the outside of the outer casing (100); the upper insulating ring (303) is engaged with the positive terminal (302) to electrically isolate the positive terminal (302) from one side of the cover plate (301); the sealing ring (304) is engaged with the positive terminal (302) to electrically isolate the positive terminal (302) from the other side of the cover plate (301); the retaining ring (305) is used to press and fix the sealing ring (304) and the upper insulating ring (303).

3. The single-sided sealed battery structure according to claim 2, characterized in that, The positive electrode assembly (300) also includes a sealing pin (306), and the positive terminal (302) is provided with a through injection hole. The sealing pin (306) is connected to the injection hole to seal the injection hole.

4. The single-sided sealed battery structure according to claim 3, characterized in that, The positive electrode assembly (300) also includes a lower insulating sheet (307), which is disposed between the cell (200) and the inner wall of the outer casing (100).

5. The single-sided sealed battery structure according to claim 1, characterized in that, The outer shell (100) has a circular groove (101) at the other end of the opening, and the cross-section of the groove (101) is triangular.

6. The single-sided sealed battery structure according to claim 5, characterized in that, The outer shell (100) is further provided with a protrusion (102) protruding into the interior of the outer shell (100), the protrusion (102) being in the shape of concentric rings; the diameters of the central circles of two adjacent rings are defined as follows: and , Define the width of each ring as L1, where L1 = (1~10) mm.

7. The single-sided sealed battery structure according to claim 1, characterized in that, The thickness of the outer shell (100) gradually increases at the end near the opening. The maximum thickness of the outer shell (100) is defined as d1, and the thickness of the uniform part of the outer shell (100) is defined as d2, where d1 = d2 + (0.05~025mm).

8. The single-sided sealed battery structure according to claim 1, characterized in that, The positive current collector (400) has a boss (401) protruding towards one end of the opening at its center.

Images