Breathing type liquid injection system for lithium battery

Abstract

The utility model discloses a lithium battery breathing type liquid injection system which comprises a liquid injection production line, the liquid injection production line is a rectangular liquid injection production line and comprises a feeding retainer cup tray, a liquid injection unit, a vacuumizing unit, a turnover unit and a turnover discharging unit which are sequentially arranged, and a conveying line is connected between every two adjacent liquid injection units to form a rectangular closed loop; a feeding mechanical arm and a feeding conveying belt are arranged beside the feeding sleeve cup tray, and a discharging mechanical arm and a discharging conveying belt are arranged beside the turnover discharging unit. The conveying line is a rubber-coated roller conveying line, and a battery positioning module is arranged on the conveying line. The lithium batteries are circularly injected and vacuumized in batches through the rectangular production line, so that the problem of non-uniform infiltration of the existing batteries is solved, the high-temperature standing time of the batteries is shortened, the occupied space of a plant is reduced, and the equipment cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery preparation, in particular to a lithium battery breathing liquid injection system. Technical Background

[0002] Based on the good performance of lithium-ion batteries, their applications are becoming more and more extensive. In the preparation process of lithium-ion batteries, it is necessary to inject electrolyte into the battery. Before the electrolyte is injected, the battery pole piece is contained in the battery shell. There is an injection hole on the surface of the battery shell. In the injection process of the lithium battery, the injector is aligned with the injection hole of the lithium battery to inject the electrolyte into the lithium battery. However, in the existing process, after the injection, it is necessary to stand for a period of time to achieve a good infiltration effect, resulting in low injection efficiency and unsatisfactory production efficiency. In addition, the existing injection system that injects liquid back and forth multiple times, that is, the breathing injection system, is a linear production line with low production stability, long product switching time, high difficulty in material distribution, and a large number of equipment. It requires multiple injection devices and vacuum devices to be arranged, which is costly and occupies a large space.

[0003] At present, some large enterprises have used multifunctional integrated automated production lines. Application number CN201611088645.0 discloses a battery shell injection system. By setting a first injection device, a first vacuum device, a second injection device, a second vacuum device, a third injection device, and a third vacuum device, the battery injection process is divided into three sections. The injection assembly line is a linear structure, which improves the level of mechanical automation. However, because the battery shell injection system is linear, the injection device and the vacuum device are repeatedly configured, the equipment cost is expensive, the investment cost is high, and due to funding constraints, there is no prospect of promotion in small and medium-sized enterprises. In addition, the probability of batch rework due to production quality problems increases, and the product line change time is long, which is not suitable for the production of multi-variety small batch products. Utility Model Content

[0004] The utility model aims to propose a breathing liquid injection system for lithium batteries, which realizes batch-by-batch cyclic liquid injection and vacuum extraction of lithium batteries through a rectangular production line, thereby solving the problem of uneven battery infiltration in the existing battery, and also shortening the high-temperature static time of the battery, reducing the space occupied by the factory and reducing the equipment cost.

[0005] The purpose of the utility model is achieved through the following technical solutions: a lithium battery breathing liquid injection system, including a liquid injection production line, the liquid injection production line is a rectangular liquid injection production line, including a feeding cup tray, a liquid injection unit, a vacuum unit, a turnover unit, and a turnover unloading unit arranged in sequence, and a conveyor line is connected between the adjacent ones to form a rectangular closed loop; a feeding manipulator and a feeding conveyor belt are arranged next to the feeding cup tray, and a unloading manipulator and a unloading conveyor belt are arranged next to the turnover unloading unit; the conveyor line is a rubber-coated roller conveyor line, and a battery positioning module is arranged on the conveyor line, the liquid injection unit includes a quantitative liquid injector, the vacuum unit includes a vacuum pump, and the quantitative liquid injector is provided with a flow control device, and the lithium battery to be injected circumferentially circumferentially along the rectangular liquid injection production line for three times through the liquid injection system injection and vacuum system exhaust, the first liquid injection amount is 62% to 70% of the total liquid injection mass, the second liquid injection amount is 11% to 19% of the total liquid injection mass, and the third liquid injection amount replenishes the mass ratio of the electrolyte to 100%.

[0006] The conveying lines include a first conveying line, a second conveying line, a third conveying line, a fourth conveying line, and a fifth conveying line.

[0007] The loading cup tray is configured to accommodate 24 battery positions in a 3×8 layout.

[0008] The loading robot and the unloading robot both include a hand, a motion mechanism and a control system.

[0009] The utility model has the following beneficial effects: the rectangular production line is used to achieve the purpose of multiple cycles of lithium battery injection. The multiple cycles of breathing injection are beneficial to the injection efficiency of the battery, avoiding potential safety problems in the production process of lithium batteries, shortening the high-temperature static time, improving the overall efficiency of battery manufacturing, and improving the safety performance and cycle performance of the battery. It is also beneficial to reduce production costs; the rectangular production line setting can also reduce production equipment, shorten the production moving distance, reduce the flow of people and logistics routes, save workshop space, and optimize production balance. The level of production mechanization and automation is improved by setting the feeding conveyor belt, feeding manipulator, unloading manipulator, and conveyor line. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of the utility model;

[0011] Explanation of numbers in the figure: 1-feeding conveyor belt, 2-loading robot, 3-loading cup tray, 4-first conveyor line, 5-liquid injection unit, 6-second conveyor line, 7-vacuum unit, 8-third conveyor line, 9-first turnover unit, 10-fourth conveyor line, 11-turnover unloading unit, 12-fifth conveyor line, 13-unloading robot, 14-unloading conveyor belt. DETAILED DESCRIPTION

[0012] The utility model is further described below in conjunction with the accompanying drawings.

[0013] See also Figure 1 As shown, the utility model provides a breathing liquid injection system for lithium batteries, including a liquid injection production line, which is a rectangular liquid injection production line, including a feeding cup tray 3, a liquid injection unit 5, a vacuum unit 7, a turnover unit 9, and a turnover unloading unit 11 arranged in sequence, and a conveyor line is connected between the adjacent ones to form a rectangular closed loop; a feeding manipulator 2 and a feeding conveyor belt 1 are arranged next to the feeding cup tray 3, and a unloading manipulator 13 and an unloading conveyor belt 14 are arranged next to the turnover unloading unit 11; the conveyor line is a rubber-coated roller conveyor line, and a battery positioning module is arranged on the conveyor line. The rectangular production line meets the needs of the circumferential circulation of products.

[0014] The injection unit 5 includes a quantitative injector to ensure that the amount of electrolyte injected into the battery each time is the standard injection amount; the vacuum unit 7 includes a vacuum pump to use an external vacuum source to discharge the gas in the battery to form a certain vacuum degree in the battery.

[0015] The quantitative liquid injector is provided with a flow control device. The lithium battery to be injected circumferentially ...

[0016] like Figure 1 As shown, the conveyor lines include a first conveyor line 4 , a second conveyor line 6 , a third conveyor line 8 , a fourth conveyor line 10 , and a fifth conveyor line 12 .

[0017] The feeding cup tray 3 is set to have 24 battery positions, 3×8 layout.

[0018] Both the loading robot 2 and the unloading robot 13 include a hand, a motion mechanism and a control system, and the control system is provided with a programmable controller.

[0019] like Figure 1 As shown, the battery injection unit of the utility model can cooperate with the vacuum device to solve the problem of uneven battery infiltration in the prior art by batch injection and vacuuming, and also shorten the high-temperature static time of the battery. In addition, because of the circulating water operation, the required high-temperature static device is reduced, which reduces the space occupied by the factory and reduces the equipment cost.

[0020] The lithium battery to be filled with liquid in the utility model is mainly divided into two parts, module 1 is the internal positive and negative electrodes and diaphragm battery structure, and module 2 is the positive and negative electrode ear structure. The injected electrolyte is mainly responsible for conducting conductive ions between the positive and negative electrodes, and the main components are solutes, solvents, additives and other raw materials configured in proportion under certain conditions.

[0021] The use process of the embodiment of the utility model: Figure 1 As shown, it is sent to the loading robot 2 through the feeding conveyor belt 1, and the loading robot 2 disassembles and assembles the cup tray. After the battery is loaded on the tray, the robot buckles the cup package on the top of the battery. It is sent to the injection unit 5 by the first conveyor line 4 for electrolyte injection. The mass percentage of the first injection volume accounts for 62% of the total injection volume, and then it is transported to the vacuum unit 7 through the second conveyor line 6 for vacuuming so that the electrolyte fully infiltrates the electrode and the diaphragm. It is then sent to the turnover unit 9 through the third conveyor line 8. The turnover unit 9 can temporarily place the tray, and after the turnover unloading unit 11 is completed, it continues to be transported through the loading cup tray 3 to the injection unit 5 for the second injection. The second injection volume accounts for 19% of the total injection volume by mass. It is sent to the No. 7 vacuum unit through the conveyor line and circulated to the injection unit 5 for the third injection. The third injection volume replenishes the electrolyte mass ratio to 100%. After the injection is completed, it is sent to the vacuum unit 7 for vacuuming. After the vacuuming is completed, it is sent to the high-temperature static device by the stacker. The high-temperature static time can be shortened according to the actual infiltration effect of the electrolyte. After the high-temperature static is completed, it is sent to the turnover unit 9 and transported to the turnover unloading unit. Then the unloading robot 13 disassembles the plate and sends it to the conveyor belt 14 for post-weighing.

Claims

1. A lithium battery breathing liquid injection system, including a liquid injection production line, characterized in that: The liquid injection production line is a rectangular liquid injection production line, comprising a feeding cup tray (3), a liquid injection unit (5), a vacuum unit (7), a turnover unit (9), and a turnover unloading unit (11) which are arranged in sequence, and a conveyor line is connected between adjacent ones to form a rectangular closed loop; a feeding manipulator (2) and a feeding conveyor belt (1) are arranged next to the feeding cup tray (3), and a unloading manipulator (13) and a unloading conveyor belt (14) are arranged next to the turnover unloading unit (11); the conveyor line is a rubber-coated roller conveyor line, and a battery positioning module is arranged on the conveyor line; the liquid injection unit (5) comprises a quantitative liquid injector, and the vacuum unit (7) comprises a vacuum pump, and the quantitative liquid injector is provided with a flow control device; the lithium battery to be injected circumferentially circumferentially circumferentially circumferentially passes through the liquid injection unit (5) for injection and the vacuum unit (7) for degassing.

2. A lithium battery breathing injection system according to claim 1, characterized in that: The conveyor lines comprise a first conveyor line (4), a second conveyor line (6), a third conveyor line (8), a fourth conveyor line (10), and a fifth conveyor line (12).

3. A lithium battery breathing injection system according to claim 2, characterized in that: The loading cup tray (3) is configured to have 24 battery positions in a 3×8 layout.

4. A lithium battery breathing injection system according to claim 3, characterized in that: The loading robot (2) and the unloading robot (13) both comprise a hand, a motion mechanism and a control system.

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