Assembly structure of lithium ion battery

Abstract

The utility model discloses an assembly structure of a lithium ion battery, which relates to the technical field of lithium battery assembly and comprises a pole, a cover plate component is arranged at the top of the pole, a connecting piece is arranged on the periphery of the bottom of the pole and is in a perforated butterfly shape, a through hole is arranged at the joint of the connecting piece and the pole, and the through hole is communicated with the pole. By arranging the connecting piece, the cover plate assembly, the first sealing ring and the second sealing ring, the stability of the structure is enhanced, the air tightness of the structure is improved, liquid leakage is prevented, meanwhile, the firmness of the structure is enhanced, and insufficient overcurrent capacity caused by insufficient welding of the connecting piece is avoided. And after the battery is short-circuited, the laser welding part is not easy to break, and the structural safety is improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery assembly technology, specifically to an assembly structure for a lithium-ion battery. Background Technology

[0002] Currently, lithium battery manufacturers primarily use riveting welding or injection molding processes to manufacture cover plate assemblies during cell assembly. These cover plate assemblies are then connected to the connecting pieces using through-laser welding technology. However, this connection method occupies a certain amount of space inside the cell. Furthermore, the airtightness of the cell relies solely on a single-layer sealing ring on the positive and negative terminals, which may pose potential risks in actual mass production due to airtightness issues caused by through-laser welding. Utility Model Content

[0003] The purpose of this utility model is to provide an assembly structure for lithium-ion batteries, so as to solve the problems that existing assembly structures occupy a certain space inside the battery cell, resulting in wasted space, excessive or unstable welding power causing insufficient compression of the sealing ring, resulting in poor airtightness and easy leakage.

[0004] An assembly structure for a lithium-ion battery includes an electrode post, a cover plate assembly at the top of the electrode post, a connecting piece at the outer periphery of the bottom of the electrode post, the connecting piece being an open butterfly shape, a through hole at the connection point between the connecting piece and the electrode post, and the connection joint between the connecting piece and the electrode post being laser welded.

[0005] Preferably, the cover plate assembly includes a light aluminum sheet that is injection molded to the pole post with PPS resin, and a first sealing ring is provided between the light aluminum sheet and the pole post by a motor.

[0006] Preferably, the bottom of the aluminum sheet is provided with a lower plastic, which is connected to the aluminum sheet by a hot-melt method.

[0007] Preferably, a second sealing ring is provided on the outer periphery of the pole post between the aluminum sheet and the connecting piece, and the second sealing ring is pressed together by the pole post and the connecting piece by a motor.

[0008] The advantages of this utility model are as follows: The assembly structure of the lithium-ion battery in this utility model enhances the stability and airtightness of the structure by setting a connecting piece, a cover plate assembly, a first sealing ring and a second sealing ring, preventing leakage. At the same time, it enhances the robustness of the structure, avoids poor welding of the connecting piece which would lead to insufficient current carrying capacity, and makes the laser welded joint less likely to break after the battery is short-circuited, thus improving the safety of the structure. Attached Figure Description

[0009] Figure 1 This is a cross-sectional view of the present invention.

[0010] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0011] Figure 3 This is a structural diagram of the existing assembly structure.

[0012] Among them, 101, pole post; 102, PPS resin; 103, aluminum sheet; 104, lower plastic; 105, first sealing ring; 106, second sealing ring; 107, joint; 108, connecting piece; 109, cover plate assembly. Detailed Implementation

[0013] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0014] like Figures 1 to 3 As shown, an assembly structure for a lithium-ion battery includes a terminal post 101. The top of the terminal post 101 is provided with a cover plate assembly 109, and the outer periphery of the bottom of the terminal post 101 is provided with a connecting piece 108. The connecting piece 108 is a butterfly-shaped opening, and a through hole is provided at the connection point between the connecting piece 108 and the terminal post 101. The connection seam 107 between the connecting piece 108 and the terminal post 101 is laser welded.

[0015] In this embodiment, the cover plate assembly 109 includes a light aluminum sheet 103 that is injection molded to the pole post 101 via PPS resin 102, and a first sealing ring 105 is provided between the light aluminum sheet 103 and the pole post 101 by a motor.

[0016] The injection molding connection of PPS resin 102 is used for mold positioning and to ensure that the first sealing ring 105 does not pop open, thereby enhancing the stability of the structure, avoiding the low compression of the first sealing ring 105 due to excessive or unstable welding power, improving the airtightness of the structure, and preventing leakage.

[0017] In this embodiment, a lower plastic 104 is provided at the bottom of the aluminum sheet 103, and the lower plastic 104 is connected to the aluminum sheet 103 by hot melting.

[0018] The use of plastic 104 ensures that the internal bare battery cell does not come into contact with the aluminum sheet 103, thus creating an insulation effect.

[0019] In this embodiment, a second sealing ring 106 is provided on the outer periphery of the pole post 101 between the aluminum sheet 103 and the connecting piece 108. The second sealing ring 106 is pressed together by the pole post 101 and the connecting piece 108 by a motor.

[0020] Laser welding at the joint 107 ensures that the second sealing ring 106 does not pop open, enhancing the structural robustness, preventing the connecting piece 108 from being poorly welded, which would result in insufficient current carrying capacity, and making the laser weld less prone to breakage after a battery short circuit, thus improving the structural safety.

[0021] Working process and principle: When using this device, the cover plate assembly 109 is first processed. The aluminum sheet 103 and the pole post 101 are connected by injection molding with PPS resin 102 for mold positioning. A first sealing ring 105 is installed between the pole post 101 and the aluminum sheet 103 by a motor, and the injection molding of PPS resin 102 ensures that it does not spring open, enhancing structural stability, improving airtightness, and preventing leakage. The lower plastic 104 is connected to the bottom of the aluminum sheet 103 by hot-melt bonding to ensure internal sealing. The bare battery cell does not contact the aluminum sheet 103, thus creating an insulating effect. Next, the battery is assembled. The cover plate assembly 109 is inverted, and the second sealing ring 106 is installed at the bottom of the terminal post 101. The connecting piece is installed on the outer periphery of the terminal post 101 at the bottom of the second sealing ring 106. The second sealing ring 106 is compressed by a motor to achieve the theoretical compression. After the second sealing ring 106 is compressed, the joint 107 between the connecting piece 108 and the terminal post 101 is connected by laser welding to ensure that the second sealing ring 106 does not spring open, thus enhancing the structural rigidity.

[0022] As is known from common technical knowledge, this utility model can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

Claims

1. An assembly structure for a lithium-ion battery, characterized in that: The device includes a pole (101), a cover plate assembly (109) on the top of the pole (101), a connecting piece (108) on the outer periphery of the bottom of the pole (101), the connecting piece (108) is a butterfly-shaped opening, a through hole is provided at the connection between the connecting piece (108) and the pole (101), and the connection seam (107) between the connecting piece (108) and the pole (101) is laser welded.

2. The assembly structure of a lithium-ion battery according to claim 1, characterized in that: The cover plate assembly (109) includes a light aluminum sheet (103) that is injection molded to the pole post (101) through PPS resin (102), and a first sealing ring (105) is provided between the light aluminum sheet (103) and the pole post (101) by a motor.

3. The assembly structure of a lithium-ion battery according to claim 2, characterized in that: The bottom of the aluminum sheet (103) is provided with a lower plastic (104), which is connected to the aluminum sheet (103) by hot melting.

4. The assembly structure of a lithium-ion battery according to claim 1, characterized in that: A second sealing ring (106) is provided on the outer periphery of the pole post (101) between the aluminum sheet (103) and the connecting piece (108). The second sealing ring (106) is pressed by the pole post (101) and the connecting piece (108) through a motor.

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