Device for wiping off residual liquid inside liquid injection port

Abstract

To provide a device for wiping off residual liquid inside a liquid injection port, which does not leave an electrolyte solution around an injection port or does not cause sealing failure.SOLUTION: A device 10 for wiring off residual liquid inside a liquid injection port includes: an externally attached injection port 21 attached to a wall, which is divided for each section for injecting an electrolyte solution; a cleaning mechanism 11 having an internal cleaning projection, capable of moving to the externally attached injection port 21; and a cleaning work table having a waste cloth supply mechanism 12 where a wiping waste cloth is supplied and conveyed, and a positioning mechanism 13 on which a battery cell 20 for work is placed and which positions the battery cell 20 to a working position. The battery cell to which the electrolyte solution is injected in a state where the externally attached injection port 21 is attached is positioned to the cleaning work table, and the electrolyte solution is wiped off by pushing the wiping waste cloth into the externally attached injection port 21 using the internal cleaning projection.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a device for wiping off residual liquid inside a liquid injection port. [Background technology]

[0002] Provided is a sealed battery in which electrolyte remaining near an electrolyte injection port during manufacturing is more reliably removed and the electrolyte injection port is reliably welded to achieve high sealing performance. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-110838 A Summary of the Invention [Problem to be solved by the invention]

[0004] The technology disclosed in Patent Document 1 can be used after electrolyte injection into a rectangular lithium-ion battery. However, in the case of batteries with an external injection port, a large amount of electrolyte remains in the injection port, causing a problem of poor sealing. [Means for solving the problem]

[0005] In one embodiment, the device for wiping off residual liquid inside the liquid injection port aligns a battery cell into which electrolyte has been injected with an external injection port attached on the cleaning work bench, and uses the internal cleaning protrusion to push a wiping cloth into the external injection port to wipe off the electrolyte. Effect of the Invention

[0006] According to the device for wiping off residual electrolyte inside the electrolyte injection port of the present disclosure, electrolyte does not remain around the injection port, and no sealing failure occurs. [Brief description of the drawings]

[0007] [Figure 1]FIG. 1 is a perspective view showing an example of a residual liquid wiping device according to an embodiment of the present invention. [Diagram 2] 4 is a schematic diagram showing an example of a rag supply mechanism of the residual liquid wiping device according to the present embodiment. FIG. [Diagram 3] FIG. 2 is a perspective view showing an example of a cleaning mechanism of the residual liquid wiping device according to the present embodiment. [Figure 4] 4 is a cross-sectional view showing an example of a cleaning mechanism of the residual liquid wiping device according to the present embodiment. FIG. [Diagram 5] FIG. 2 is a perspective view showing an example of a cleaning mechanism of the residual liquid wiping device according to the present embodiment. [Figure 6] 11 is a graph showing evaluation results of the residual liquid wiping device according to the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] This embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view showing an example of a residual liquid wiping device according to this embodiment. In Fig. 1, the residual liquid wiping device 10 includes a cleaning mechanism 11, a rag supply mechanism 12, and an alignment mechanism 13. The residual liquid wiping device 10 wipes off residual liquid from an external injection port 21 attached to a battery cell 20. The external injection port 21 is attached to a wall and divided into sections for injecting electrolyte.

[0009] The cleaning mechanism 11 has an internal cleaning protrusion that is operated by an air cylinder. The cleaning mechanism 11 operates the air cylinder to push a wiping cloth, which will be described later, into the external injection port. The rag supply mechanism 12 supplies wiping rags to the cleaning mechanism 11 .

[0010] The alignment mechanism 13 aligns the battery cell 20, into which electrolyte has been injected and which has the external injection port 21 attached, on a cleaning workbench (not shown). The alignment mechanism 13 measures the distance from a reference position using a work position confirmation sensor 131. This obtains the amount of deviation from the reference position, and the front-rear actuator 132 adjusts the position of the part to be cleaned.

[0011] In addition, the sensor is configured in two pairs, and by measuring both ends of the 10 sets of injection ports, the amount of rotation of the workpiece can be obtained from the difference between the values ​​of the two sensors. Then, the angle of the part that performs the cleaning work is adjusted by the rotation actuator 133.

[0012] With the above configuration, the residual liquid wiper wipes away the residual liquid. The battery module is supplied to the residual liquid wiper 10 while it is in an upright position. In the process, after electrolyte is injected into the battery module through an external injection port in the previous process, the residual liquid wiper 10 is applied to wipe away the liquid remaining inside the injection port. A strip-shaped rag is used for cleaning, and is supplied wound on a bobbin. The inside of the injection port is cleaned by pressing this rag against it using a cleaning mechanism. This makes it possible to prevent defects during sealing.

[0013] Next, the supply of the rag will be described. As shown in Fig. 1, the rag is supplied in a bobbin shape and disposed of in a used rag bag. Fig. 2 is a schematic diagram showing an example of a rag supply mechanism of the residual liquid wiping device according to this embodiment. The rag supply mechanism 12 includes a bobbin 121, a first power 122, a tension control mechanism 123, a nip 124, a second power 125, and a garbage bag 126. The cleaning mechanism 11 and the battery cell 20 are located between the tension control mechanism 123 and the nip 124.

[0014] The rag to be supplied is wound around the bobbin 121. The first power source 122 is a power source that rotates the bobbin 121. The first power source 122 is preferably a motor, for example. The tension control mechanism 123 detects the fluctuating tension and maintains a constant tension. The nip 124 pinches the rag between multiple rollers and winds up the rag. The second power source 125 is a power source that rotates the nip 124. The second power source 125 is preferably a motor, for example. The garbage bag 126 is a bag for storing used rags.

[0015] With the above configuration, the rag supply mechanism 12 repeats cleaning and unwinding the length of the rag used after cleaning from the bobbin. The rag 127 is transported at an amount determined by the second power source 125 attached to the nip 124. The tension that fluctuates during this process is detected by the tension control mechanism 123 so that a constant tension can be maintained. Then, the rag is unwound from the bobbin 121.

[0016] FIG. 3 is a perspective view showing an example of a cleaning mechanism of the device for wiping off residual liquid according to the present embodiment. Also, FIG. 4 is a cross-sectional view showing an example of a cleaning mechanism of the device for wiping off residual liquid according to the present embodiment. Also,

[0017] As shown in (a) to (d) of Fig. 3, cleaning mechanisms 11 are pressed against the injection ports one by one in sequence starting from the nip side (left side of the figure) in Fig. 2. Cleaning mechanisms 11 that press have protrusions 111 aligned with the injection ports as shown in Fig. 4. Then, by pressing the protrusions against injection ports 21, electrolyte 128 remaining inside the injection ports is sucked up, enabling cleaning.

[0018] Next, the operation of pressing each of the sets of injection ports from the nip 124 side will be described. When pressed, the rag 127 is pulled into the inside of the injection port 21, as shown in the right diagram of Fig. 4. By pressing each of the sets of injection ports from the nip 124 side, the tension control mechanism 123 detects that the rag 127 has been pulled in, and repeatedly unwinds the rag 127 from the bobbin 121 to release the tension (see Fig. 2). This allows all of the injection port sets to be cleaned consecutively, so that the inside of the injection port 21 can be cleaned all at once in a short period of time.

[0019] The air cylinder 112 attached to the tip of the cleaning mechanism 11 has a function of pressing the protrusion against the injection port 21 through the waste cloth with a constant thrust. However, this is not limited to an air cylinder, and it can be replaced with an air spring or other device with an equivalent function.

[0020] The results of evaluation of a plurality of patterns of tip shapes imitating the configuration of Fig. 3 are described below. Fig. 5 is a perspective view showing an example of a cleaning mechanism of a residual liquid wiping device according to the present embodiment. Wiping of residual liquid from the tip of the cleaning mechanism 11 shown in Fig. 5 (a) to (d) was evaluated. The evaluation method is as follows.

[0021] After dripping a certain weight of electrolyte into the blocked external injection port, the tip of the cleaning mechanism 11 is pressed against the external injection port with the same thrust (18 N), and the rag is replaced with a new one. Then, the weight of the electrolyte remaining in the external injection port is measured.

[0022] The rag used was Bemliese (registered trademark) NE107, and the electrolyte used was a liquid using diethyl carbonate as a solvent and LiFSI (Lithium Bis(fluorosulfonyl)imide) as an electrolyte.

[0023] Fig. 6 is a graph showing the evaluation results of the residual liquid wiper device according to the present embodiment. In Fig. 6, the vertical axis shows the liquid level, and the horizontal axis shows the number of cleanings. The liquid level is calculated by converting the remaining weight of the electrolyte into the remaining liquid level from the volume.

[0024] The liquid level is set to zero at the top, and a height of 2 mm or more is the cleaning completion line where no sealing failure occurs.

[0025] The evaluation results shown in Figure 6 show that in contrast to the flat rubber shape (a) which has no protrusions and cannot be cleaned by pushing a rag inside, the other shapes (b) to (d) which have protrusions were able to lower the liquid level to a height (2 mm or more) where poor sealing did not occur after one or more cleanings.

[0026] In this manner, with the device for wiping off the remaining liquid inside the injection port of the present embodiment, the electrolyte does not remain around the injection port, and no sealing failure occurs. In addition, when the film is heat-sealed and sealed, heat is not absorbed by the remaining electrolyte, resulting in an insufficient welding temperature.

[0027] The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit and scope of the present invention. For example, the residual liquid wiping device of the above-described embodiment is suitable for wiping residual liquid inside a liquid injection port in a manufacturing process of a bipolar secondary battery for vehicle use. [Explanation of symbols]

[0028] 10 Residual liquid wiping device 11 Cleaning mechanism 12 Waste supply mechanism 13 Alignment mechanism 20 Battery Cells 21 Inlet

Claims

[Claim 1] an external wall-mounted injection port divided into sections for injecting electrolyte; a cleaning mechanism having an internal cleaning protrusion movable to the external injection port; a cleaning work table having a rag supply mechanism that supplies and transports wiping rags, and a positioning mechanism on which a battery cell to be worked is placed and which aligns the battery cell to a working position; The device for wiping off residual liquid inside the injection port aligns a battery cell into which electrolyte has been injected with the external injection port attached on the cleaning work bench, and uses the internal cleaning protrusion to push a wiping cloth into the external injection port to wipe off the electrolyte.

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