Periphery welding device for lithium ion battery

Abstract

The utility model relates to a device for welding the periphery of a lithium ion battery. The device comprises a clamp shell, a fixed edge pressing strip and a movable edge pressing strip, by arranging the fixed edge pressing strip and the movable edge pressing strip, the battery cell is preliminarily fixed; the movable edge pressing strip is arranged in a detachable connection mode, so that the battery cell can be extruded to a welding condition; meanwhile, the pipelines are arranged in the fixed edge pressing strip and the movable edge pressing strip and are matched with the liquid inlet and the liquid outlet, so that the flowing of cooling liquid is realized by utilizing the communicating pipelines, and the heat generated in the welding process of the periphery of the battery cell is taken away, and the damage or breakage of the internal structure of the battery cell and other devices caused by high temperature is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a welding device for the periphery of a lithium-ion battery. Background Art

[0002] The statements herein only provide the background art related to the utility model, and do not necessarily constitute the prior art.

[0003] A lithium-ion battery is a type of battery that uses a lithium metal or lithium alloy as the positive / negative electrode material and a non-aqueous electrolyte solution. Due to its high energy density, high charge and discharge efficiency, and excellent performance, it is widely used in fields such as automobiles, electronic products, and medical facilities.

[0004] During the production process of lithium-ion batteries, it is necessary to place the battery cells into the corresponding fixtures, and use a cylinder to squeeze the fixtures so that the battery cells meet the welding standard. Then, a welding device is used to perform welding operations on the periphery of the battery cells, thereby completing the production of the battery cells.

[0005] However, during the welding process, the temperature around the battery cells can reach thousands of degrees Celsius due to welding, and the high temperature is likely to cause the battery cells to bulge internally, and at the same time cause damage or explosion to the structures such as the explosion-proof valves already fixed on the battery cells. Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is to provide a welding device for the periphery of a lithium-ion battery. By setting a fixed side pressing strip and a movable side pressing strip, the battery cells are fixed; at the same time, pipelines are arranged inside the fixed side pressing strip and the movable side pressing strip, and the pipelines are used to flow the coolant, so as to take away the heat generated by welding the periphery of the battery cells, thereby avoiding damage or breakage of the internal structure and other components of the battery cells caused by high temperature.

[0007] The purpose of the utility model is to provide a welding device for the periphery of a lithium-ion battery, including a fixture housing, a fixed side pressing strip, and a movable side pressing strip. The structures of the fixed side pressing strip and the movable side pressing strip are the same, and the fixed side pressing strip and the movable side pressing strip are symmetrically arranged at the tops of two opposite sides of the fixture housing; a communicating pipeline is arranged inside the fixed side pressing strip, and a liquid inlet and a liquid outlet are arranged on the surface of the fixed side pressing strip. The liquid inlet and the liquid outlet are respectively communicated with the two ends of the communicating pipeline inside the fixed side pressing strip.

[0008] As a further technical solution, the fixed side pressing strip is fixedly connected to the top of the side of the fixture housing.

[0009] As a further technical solution, the movable side pressing strip is detachably connected to the top of the side of the fixture housing.

[0010] As a further technical solution, the height of the liquid outlet on the fixed edge strip and the movable edge strip is higher than the height of the liquid inlet.

[0011] As a further technical solution, the material of the clamp housing is aviation aluminum.

[0012] As a further technical solution, the fixed edge strips and the movable edge strips are made of aviation aluminum.

[0013] As a further technical solution, the interior of the communicating pipe is coated with a waterproof layer.

[0014] As a further technical solution, the communicating pipe is an S-shaped structure.

[0015] As a further technical solution, the surfaces of the liquid inlet and the liquid outlet are provided with threads.

[0016] As a further technical solution, the length of the fixed edge strip is the same as the length of the side of the connected clamp housing.

[0017] Beneficial effects of one or more of the above technical solutions:

[0018] The present application fixes the battery cell by setting fixed side strips and movable side strips; at the same time, connecting pipes are set inside the fixed side strips and the movable side strips, and the connecting pipes are used to realize the flow of coolant by cooperating with the liquid inlet and outlet, thereby taking away the heat generated by the welding process around the battery cell, thereby avoiding damage or breakage of the internal structure of the battery cell and other components caused by high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings in the specification that constitute part of this application are used to provide further understanding of this application. In order to facilitate understanding, the proportions between the structures of each part have been adjusted. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation on this application.

[0020] Figure 1 This is a diagram of the implementation process of a peripheral welding device for lithium-ion batteries according to the present utility model.

[0021] Figure 2 This is an exploded view of a welding device for the periphery of a lithium-ion battery according to the present invention.

[0022] Figure 3 This is a cross-sectional view of a fixed edge pressure strip and a movable edge pressure strip used in a peripheral welding device for a lithium-ion battery according to the present invention.

[0023] Among them, 1. clamp shell, 2. fixed side pressure strip, 3. movable side pressure strip, 4. connecting pipe, 5. liquid inlet, 6. liquid outlet, 7. cylinder, 8. battery cell. Detailed implementation mode

[0024] The following combines the attached Figures 1-3 to clearly and completely describe the technical solutions in the embodiments of the present utility model.

[0025] Embodiment 1

[0026] Referring to Figures 1-2 , a welding device for the periphery of a lithium-ion battery includes a fixture housing 1, a fixed side pressing strip 2 and a movable side pressing strip 3.

[0027] In this embodiment, the fixture housing 1 is a rectangular box without an upper bottom surface and with a hollow interior, and the hollow interior space is used to place the battery cell 8; and the size of the hollow interior space can be set according to the size of the battery cell 8 to be welded. In addition, the fixture housing 1, the fixed side pressing strip 2 and the movable side pressing strip 3 are made of aviation aluminum material, which not only has sufficient hardness but also has good heat conduction performance.

[0028] Moreover, the structures of the fixed side pressing strip 2 and the movable side pressing strip 3 are the same. Specifically, the fixed side pressing strip 2 and the movable side pressing strip 3 are in a cuboid structure, and the length of the long side of this cuboid structure is the same as the length of the long side of the fixture housing, which is beneficial to fixedly connecting the fixed side pressing strip 2 and the movable side pressing strip 3 to the fixture housing 1.

[0029] In this embodiment, the fixed side pressing strip 2 and the movable side pressing strip 3 are symmetrically arranged at the tops of two opposite side edges of the fixture housing 1; specifically, the fixed side pressing strip 2 and the movable side pressing strip 3 are symmetrically arranged at the tops of the two long side surfaces of the cuboid structure fixture housing 1 and on the side without the upper bottom surface.

[0030] Among them, the fixed side pressing strip 2 is fixedly connected to the top of the side edge of the fixture housing 1; it can be considered that the fixed side pressing strip 2 and the fixture housing 1 are in an integral structure. And the movable side pressing strip 3 is detachably connected to the top of the side edge of the fixture housing 1; that is, the movable side pressing strip 3 and the fixture housing 1 can be not connected, and during use, the movable side pressing strip 3 can be placed at a suitable position on the fixture housing 1; or the movable side pressing strip 3 and the fixture housing 1 can be connected through a hinge structure, and the position of the movable side pressing strip 3 can be adjusted by flipping.

[0031] Through the above fixed side pressing strip 2 with a fixed connection and the movable side pressing strip 3 with a detachable connection, the battery cell 8 can be effectively fixed; at the same time, when the battery cell 8 is squeezed by using the air cylinder 7, by means of the detachable connection (can move) of the movable side pressing strip 3, the air cylinder 7 can push the movable side pressing strip 3 to squeeze the battery cell 8, so as to squeeze the battery cell 8 into a state where welding can be carried out, facilitating subsequent welding of the battery cell 8.

[0032] According to Figure 3, in this embodiment, the fixed-side pressing strip 2 and the movable-side pressing strip 3 are internally provided with a communication pipeline 4. Specifically, the communication pipeline 4 is arranged along the length direction of the cuboid structure, and the structure of the communication pipeline 4 is set as an S-shaped structure; among them, the communication pipeline 4 is used for the circulation of the coolant, and through the above-mentioned communication pipeline 4, there is enough time to ensure that the coolant absorbs enough heat, so as to take away the heat generated during the welding of the periphery of the battery cell 8. And the shape of the communication pipeline 4 can also be adjusted accordingly according to the actual scenario.

[0033] At the same time, a liquid inlet 5 and a liquid outlet 6 are respectively arranged on the surfaces of the two outer sides corresponding to the wide sides of the fixed-side pressing strip 2 and the movable-side pressing strip 3, that is, the liquid inlet 5 and the liquid outlet 6 are respectively arranged on two relatively symmetrical wide-side side surfaces; and the liquid inlet 5 and the liquid outlet 6 are respectively communicated with both ends of the communication pipeline 4 inside the fixed-side pressing strip 2; at the same time, the connection method of the movable-side pressing strip 3 is also the same.

[0034] Moreover, the height of the liquid outlet 6 on the fixed-side pressing strip 2 and the movable-side pressing strip 3 is higher than the height of the liquid inlet 5. Among them, threads are provided on the surfaces of the liquid inlet 5 and the liquid outlet 6 for communicating with the matching infusion pipeline; at the same time, the infusion pipeline can be sequentially connected to structures such as a water pump and a water storage tank to ensure the normal circulation of the coolant in the communication pipeline 4 inside the fixed-side pressing strip 2 and the movable-side pressing strip 3. Through the setting that the height of the liquid outlet 6 is higher than the height of the liquid inlet 5, it can be ensured that the coolant can completely fill the entire communication pipeline 4, so as to further ensure that the coolant can absorb enough heat.

[0035] Usage steps: First, place the battery cell 8 inside the fixture housing 1, and orient the side to be welded towards the side of the fixed-side pressing strip 2, and then place the movable-side pressing strip 3 on the top of the side opposite to the fixed-side pressing strip 2 on the fixture housing 1 to achieve the preliminary fixation of the battery cell 8; then use the cylinder 7 to squeeze the movable-side pressing strip 3, and achieve the extrusion of the battery cell 8 by pushing the movable-side pressing strip 3, so as to ensure that the battery cell 8 meets the welding standard; immediately afterwards, turn on relevant devices such as the water pump to fill the communication pipeline 4 inside the fixed-side pressing strip 2 and the movable-side pressing strip 3 with the coolant, and achieve the circulation and replacement of the coolant; at the same time, start welding the periphery of the battery cell 8; and the coolant flowing in the communication pipeline 4 in the fixed-side pressing strip 2 and the movable-side pressing strip 3 can absorb the heat generated by the welding, so as to ensure that the temperature of the periphery of the battery cell 8 will not be too high.

[0036] Through the above process, the influence of the high temperature generated during the welding process on the internal structure of the battery cell 8, such as bulging, etc., is avoided, and at the same time, the influence of the high temperature on devices such as explosion-proof valves is avoided, and the phenomenon that some devices are damaged or cracked due to high temperature is avoided.

[0037] Meanwhile, a waterproof layer is applied inside the connecting pipe 4, thereby extending the service life of the connecting pipe 4.

[0038] Although the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, they do not limit the protection scope of the present invention. Those skilled in the art should understand that various modifications or deformations that can be made without creative efforts on the basis of the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A welding device for the periphery of a lithium-ion battery, characterized in that, It includes a fixture housing, a fixed edge pressing strip and a movable edge pressing strip. The structures of the fixed edge pressing strip and the movable edge pressing strip are the same. The fixed edge pressing strip and the movable edge pressing strip are symmetrically arranged at the tops of two opposite sides of the fixture housing. A communication pipeline is provided inside the fixed edge pressing strip. A liquid inlet and a liquid outlet are arranged on the surface of the fixed edge pressing strip. The liquid inlet and the liquid outlet are respectively communicated with two ends of the communication pipeline inside the fixed edge pressing strip.

2. The peripheral welding device for a lithium-ion battery according to claim 1, characterized in that, The fixed edge pressing strip is fixedly connected to the top of the side of the fixture housing.

3. A peripheral welding device for a lithium-ion battery according to claim 1, characterized in that, The movable edge pressing strip is detachably connected to the top of the side of the fixture housing.

4. A peripheral welding device for a lithium-ion battery according to claim 1, characterized in that, The height of the liquid outlet on the fixed edge pressing strip and the movable edge pressing strip is higher than that of the liquid inlet.

5. The peripheral welding device for a lithium-ion battery according to claim 1, characterized in that, The material of the fixture housing is aviation aluminum.

6. The peripheral welding device for a lithium-ion battery according to claim 1, characterized in that, The materials of the fixed edge pressing strip and the movable edge pressing strip are aviation aluminum.

7. The peripheral welding device for a lithium-ion battery according to claim 1, characterized in that A waterproof layer is coated inside the communication pipeline.

8. A peripheral welding device for a lithium-ion battery according to claim 1, characterized in that, The communication pipeline is of an S-shaped structure.

9. The peripheral welding device for a lithium-ion battery according to claim 1, characterized in that Threads are provided on the surfaces of the liquid inlet and the liquid outlet.

10. The peripheral welding device for lithium-ion batteries according to claim 1, characterized in that: The length of the fixed edge pressing strip is the same as the length of the side of the connected fixture housing.

Images