Electrolyte removing device

Abstract

The electrolyte removal device of the present invention includes an electrolyte removal unit for removing electrolyte remaining in the opening and beading portion of a can, and the electrolyte removal unit includes an air injection passage for injecting air toward the opening and beading portion of the can to introduce the electrolyte remaining in the opening and beading portion of the can into the electrode assembly receiving portion of the can to remove it.

Description

Technology Field

[0001] The present invention relates to an electrolyte removal device capable of removing electrolyte remaining in the opening and beading portion of a can after an electrolyte impregnation process, and electrolyte remaining on the upper part of an insulator, by introducing them into the interior of the can. Background Technology

[0002] Generally, a secondary battery refers to a battery that can be charged and discharged, unlike a primary battery which cannot be recharged. Such secondary batteries are widely used in the field of high-tech electronic devices, such as phones, laptop computers, and camcorders.

[0003] The aforementioned secondary batteries are classified into can-type secondary batteries, in which the electrode assembly is embedded in a metal can, and pouch-type secondary batteries, in which the electrode assembly is embedded in a pouch.

[0004] The above-described can-type secondary battery comprises an electrode assembly, an electrolyte, a can containing the electrode assembly and the electrolyte, and a cap assembly mounted on the opening of the can. And the pouch-type secondary battery comprises an electrode assembly, an electrolyte, and a pouch containing the electrode assembly and the electrolyte.

[0005] Meanwhile, the method for manufacturing the above-described can-type secondary battery comprises the steps of: manufacturing a can having an opening, a beading portion, and a receiving portion; receiving an electrode assembly in the receiving portion of the can and placing an insulator on top of the electrode assembly; injecting an electrolyte into the receiving portion to impregnate the electrode assembly; and placing a cap assembly in the opening of the can and then clamping the opening to secure it.

[0006] Here, the can manufacturing process includes forming a plating layer on the surface of the can to prevent rust and cutting the edges of the can's opening to improve quality.

[0007] However, after the electrolyte injection process, defects in the bonding between the can and the cap assembly may occur due to the electrolyte remaining in the can's opening and beading area, and there was a problem where the electrolyte could not be sufficiently impregnated into the electrode assembly due to the electrolyte remaining on the upper part of the insulator. In particular, when the plating layer is removed as the end of the opening is cut, there was a problem where rust formed on the end of the opening due to the residual electrolyte. Prior art literature

[0008] Patent Publication No. 10-2017-005104. The problem to be solved

[0009] The present invention aims to provide an electrolyte removal device that can improve the bonding between a can and a cap assembly and improve the impregnation of the electrolyte by introducing the electrolyte remaining in the opening and beading portion of the can and the electrolyte remaining on the upper part of the insulator into the interior of the can to remove them, and in particular, prevents rust from forming at the end of the opening of the can. means of solving the problem

[0010] The electrolyte removal device of the present invention includes an electrolyte removal unit for removing electrolyte remaining in the opening and beading portion of a can, and the electrolyte removal unit may include an air injection passage for injecting air toward the opening and beading portion of the can to introduce the electrolyte remaining in the opening and beading portion of the can into the electrode assembly receiving portion of the can to remove it.

[0011] The above electrolyte removal unit may further include an air recovery passage for recovering air discharged from inside the can.

[0012] The above electrolyte removal unit may have an air injection passage formed at the rim for spraying air toward the opening and beading portion of the can, and an air recovery passage formed on the inner side closer to the center than at the rim for recovering air discharged from inside the can.

[0013] The above electrolyte removal unit comprises an outer tube located at the opening of the can; and an inner tube provided inside the outer tube and divided so as not to allow air to pass between the outer outlet portion and the outer recovery portion of the outer tube, wherein the air injection passage is formed between the outer outlet portion of the outer tube and the inner outlet portion of the inner tube and injects air toward the opening of the can and the beading portion, and the air recovery passage is formed to be connected from inside the inner tube to a recovery port formed in the outer recovery portion of the outer tube and can recover air discharged from inside the can.

[0014] The outer diameter of the inner outlet portion may be formed to be smaller than the inner diameter of the opening.

[0015] The inner outlet portion may be formed to protrude further toward the can than the outer outlet portion.

[0016] The inner diameter of the above exterior can be formed to be larger than the outer diameter of the opening of the can.

[0017] The inner tube may be coupled with an inner outlet portion provided at a predetermined distance from the outer outlet portion of the outer tube; an inner coupling portion coupled to the outer tube and dividing the outer outlet portion and the outer recovery portion so as not to allow air to pass between them; and an air supply member may be coupled to the outer side of the outer tube where the inner coupling portion and the inner outlet portion are connected and the inner connection portion has a smaller diameter than the inner outlet portion, and which supplies air to the outer side of the outer tube where the inner connection portion is located.

[0018] It may further include a sealing member that seals the space between the electrolyte removal unit and the opening of the can.

[0019] The sealing member may include a fixing part fixed to the electrolyte removal unit and a supporting part supported in a manner that surrounds the outer surface of the opening of the can.

[0020] On the outer side of the above-mentioned outer outlet portion, a fixing groove may be formed into which the above-mentioned fixing portion is inserted and fixed.

[0021] The inner outlet portion is formed to protrude further toward the can than the outer outlet portion, and the sealing member may further include a projection that is inserted into the space created by the difference in length between the inner outlet portion and the outer outlet portion and is supported on the surface of the opening of the can.

[0022] The above-mentioned protrusion may be provided on a part of the inner surface of the support member corresponding to the space created by the difference in length between the inner outlet part and the outer outlet part.

[0023] It may further include a jig unit that fixes the above can so that it does not move.

[0024] It may further include a lifting unit that lowers the electrolyte removal unit toward the opening of the can or returns it to its original position.

[0025] The inner connecting part can be connected to the outer part through a connecting bolt. Effects of the invention

[0026] The electrolyte removal device of the present invention is characterized by including an electrolyte removal unit. Due to this feature, the electrolyte remaining in the opening and beading portion of the can can be removed by introducing it into the interior of the can, thereby increasing the bonding strength between the can and the cap assembly, increasing the impregnation of the electrolyte, and particularly preventing rust from forming at the end of the opening of the can.

[0027] In addition, the electrolyte removal unit of the electrolyte removal device of the present invention is characterized by having an air injection passage formed at the rim and an air recovery passage formed in the center. Due to these features, the electrolyte remaining in the opening and beading portion of the can can be quickly removed, and the air discharged from the inside of the can can be quickly recovered.

[0028] In addition, the electrolyte removal unit of the electrolyte removal device of the present invention comprises an outer tube and an inner tube having a double structure, and is characterized in that an air injection passage is formed between the outer outlet portion of the outer tube and the inner outlet portion of the inner tube, and an air recovery passage is formed to connect from the inside of the inner tube to a recovery port formed in the outer recovery portion of the outer tube. Due to these features, the air injection passage and the air recovery passage can be stably implemented, and as a result, the size of the electrolyte removal unit can be minimized, thereby increasing manufacturing efficiency.

[0029] Meanwhile, the outer diameter of the inner outlet portion of the inner tube in the electrolyte removal unit of the electrolyte removal device of the present invention is characterized by being formed smaller than the inner diameter of the opening of the can. Due to this characteristic, air can be stably injected into the opening of the can and the beading portion, and interference between the inner tube and the can can be prevented.

[0030] Meanwhile, the inner outlet portion of the inner tube in the electrolyte removal unit of the electrolyte removal device of the present invention is characterized by being formed to protrude further toward the can than the outer outlet portion of the outer tube. Due to this feature, air can be stably injected to the beading portion of the can, and as a result, the electrolyte remaining in the beading portion can be completely removed.

[0031] Meanwhile, the electrolyte removal unit of the electrolyte removal device of the present invention is characterized in that the inner tube comprises an inner outlet portion, an inner coupling portion, and an inner connecting portion having a diameter smaller than that of the inner outlet portion, and an air supply member is coupled to the outer side of the outer tube where the inner connecting portion is located. Due to this feature, air supplied from the air supply member can be stably supplied to an air injection passage formed between the inner outlet portion of the inner tube and the outer outlet portion of the outer tube.

[0032] Meanwhile, the electrolyte removal device of the present invention is characterized by further including a sealing member that seals the space between the electrolyte removal unit and the opening of the can. Due to this feature, the space between the can and the electrolyte removal unit can be sealed, thereby preventing the electrolyte remaining in the can from scattering in all directions by the air sprayed from the electrolyte removal unit. In particular, the electrolyte remaining in the can, as well as the electrolyte remaining on the upper part of the insulator placed in the electrode assembly receiving portion of the can, can be guided to flow into the electrode assembly receiving portion of the can and removed. This can increase the electrolyte impregnation capacity.

[0033] Meanwhile, the sealing member in the electrolyte removal device of the present invention is characterized by being inserted into the space created by the difference in length between the inner outlet portion of the inner tube and the outer outlet portion of the outer tube, and including a projection supported on the upper surface of the opening of the can. Due to this feature, collision and noise generation between the can and the electrolyte removal unit can be prevented. Brief explanation of the drawing

[0034] FIG. 1 is a cross-sectional view illustrating a secondary battery according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a can containing an electrode assembly after an electrolyte impregnation process. FIG. 3 is a process diagram illustrating an electrolyte removal device according to a first embodiment of the present invention. FIG. 4 is a perspective view illustrating an electrolyte removal unit of an electrolyte removal device according to a first embodiment of the present invention. Fig. 5 is a cross-sectional view of Fig. 4. FIG. 6 is an enlarged view of section A shown in FIG. 5. FIG. 7 is a perspective view illustrating a sealing member of an electrolyte removal device according to a first embodiment of the present invention. FIG. 8 is a cross-sectional view illustrating the usage state of an electrolyte removal device according to a first embodiment of the present invention. Fig. 9 is an enlarged view of section B shown in Fig. 8. FIG. 10 is a cross-sectional view illustrating an electrolyte removal unit according to a second embodiment of the present invention. Specific details for implementing the invention

[0035] Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification are denoted by similar reference numerals.

[0036] [Secondary battery according to the first embodiment of the present invention]

[0037] FIG. 1 is a cross-sectional view illustrating a secondary battery according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view illustrating a can containing an electrode assembly after an electrolyte impregnation process.

[0038] A secondary battery (1) according to the first embodiment of the present invention comprises, as shown in FIG. 1, an electrode assembly (11), a can (12) that accommodates the electrode assembly (11), a cap assembly (13) that is mounted in an opening (122) of the can (12), and an insulator (14) that insulates between the cap assembly (13) and the electrode assembly (11).

[0039] The electrode assembly (11) has a structure in which a plurality of electrodes and a plurality of separators are alternately arranged, and the plurality of electrodes may be positive and negative electrodes.

[0040] The above can (12) has a structure that is open in one direction (upward direction when viewed in FIG. 1) and includes an opening (122) which is an inlet, an electrode assembly receiving portion (121) in which an electrode assembly (11) is received, and a beading portion (123) provided between the electrode assembly receiving portion (121) and the opening (122) and supporting a cap assembly (13). That is, referring to FIG. 1, the opening (122), the beading portion (123), and the electrode assembly receiving portion have a structure in which they are arranged sequentially along the up and down direction.

[0041] A method for manufacturing a secondary battery having the above-described structure comprises: a process of manufacturing a can (12) having an opening (122), a beading portion (123), and an electrode assembly receiving portion (121); a process of receiving an electrode assembly (11) and an insulator (14) in the electrode assembly receiving portion of the can (12); a process of injecting an electrolyte (15) into the can (12) to impregnate the electrode assembly (11); and a process of inserting a cap assembly (13) into the opening (122) of the can (12) and clamping the cap assembly (13) to fix the cap assembly (13).

[0042] As shown in FIG. 2, after the electrolyte (15) impregnation process, the electrolyte (15) remains on the upper surface of the can (12)'s opening (122), the beading part (123), and the insulator (14). This residual electrolyte (15) can cause problems such as poor bonding between the can (12) and the cap assembly (13), and rust forming on the can (12)'s opening (122). In particular, impregnation defects may occur as the amount of electrolyte (15) impregnated into the electrode assembly (11) decreases.

[0043] To solve such problems, the present invention further includes a process of removing the electrolyte (15) remaining in the can (12) and the insulator (14) by introducing it into the electrode assembly receiving portion (121) of the can (12), and at this time, an electrolyte removal device (2) according to the first embodiment of the present invention is used.

[0044] That is, the electrolyte removal device (2) according to the first embodiment of the present invention can remove the electrolyte (15) remaining in the opening (122) and beading portion (123) of the can (12) by introducing it into the interior of the can, and in particular, prevents electrolyte (15) impregnation defects by introducing the electrolyte (15) remaining on the upper surface of the insulator (14) into the electrode assembly receiving portion (121).

[0045] Hereinafter, an electrolyte removal device (2) according to the first embodiment of the present invention will be described in detail with reference to the attached drawings.

[0046] [Electrolyte removal device according to the first embodiment of the present invention]

[0047] FIG. 3 is a process diagram illustrating an electrolyte removal device according to a first embodiment of the present invention, FIG. 4 is a perspective view illustrating an electrolyte removal unit of an electrolyte removal device according to a first embodiment of the present invention, FIG. 5 is a cross-sectional view of FIG. 4, and FIG. 6 is an enlarged view of part A indicated in FIG. 5.

[0048] As shown in FIGS. 3 and 4, the electrolyte removal device (2) according to the first embodiment of the present invention includes an electrolyte removal unit (21) that removes the electrolyte (15) remaining in the opening (122) and beading portion (123) of the can (12) by introducing it into the interior of the can.

[0049] Electrolyte removal unit

[0050] The above electrolyte removal unit (21) has a structure that uses air to remove the electrolyte (15) remaining in the opening (122), beading part (123), and insulator (14) of the can (12) by introducing it into the interior of the can.

[0051] That is, the electrolyte removal unit (21) has an air injection passage (3) that sprays air toward the opening (122) and beading portion (123) of the can (12) to remove the electrolyte (15) remaining in the opening (122) and beading portion (123) of the can (12) by introducing it into the interior of the can, and an air recovery passage (4) that recovers the air discharged from the interior of the can (12).

[0052] That is, the electrolyte removal unit (21) sprays air into the can (12) through the air injection passage (3) to remove the electrolyte (15) remaining in the opening (122), beading part (123), and insulator of the can (12) by introducing it into the interior of the can. Then, the air sprayed into the interior of the can (12) is discharged out, and the air discharged to the outside of the can (12) is recovered through the air recovery passage (4). Accordingly, the electrolyte (15) remaining in the opening, beading part, and insulator of the can (12) can be stably removed.

[0053] To explain in more detail, the electrolyte removal unit (21) has an air injection passage (3) formed at the rim that sprays air toward the opening (122) and beading portion (123) of the can (12), and an air recovery passage (4) formed on the inner side (preferably the center) closer to the center than the rim that recovers air discharged from inside the can (12). That is, an air injection passage is formed at the rim of the electrolyte removal unit, and an air recovery passage is formed in the center. Accordingly, by spraying air through the air injection passage (3) formed at the rim, the electrolyte (15) remaining in the opening (122), beading portion (123), and insulator of the can (12) is introduced into the interior of the can to be removed, and the air discharged from the can (12) can be recovered through the air recovery passage (4) formed in the center.

[0054] For example, the electrolyte removal unit (21) includes an outer tube (2111) located at the opening (122) of the can (12); and an inner tube (2112) provided inside the outer tube (2111) and divided so as not to allow air to pass between the outer outlet (21111) and the outer recovery (21112) of the outer tube (2111). That is, the outer tube (2111) and the inner tube (2112) have a double-tube structure.

[0055] The above outer casing (2111) has a structure that is open only in the direction toward the can (12) and includes an outer outlet portion (21111) to which an air supply member (212) is coupled, and an outer recovery portion (21112) to which an air recovery member (213) is coupled. That is, the outer outlet portion and the outer recovery portion have a structure that is connected in the longitudinal direction of the outer casing.

[0056] The inner tube (2112) comprises an inner outlet portion (21121) provided at a predetermined distance from the outer outlet portion (21111) of the outer tube (2111), an inner connecting portion (21122) coupled to the outer tube (2111) and dividing the outer outlet portion (21111) and the outer recovery portion (21112) so as not to allow air to pass through, and an inner connecting portion (21123) connecting the inner connecting portion (21122) and the inner outlet portion (21121) and having a smaller diameter than the inner outlet portion (21121).

[0057] That is, the outer surface of the inner connection part (21123) has a smaller diameter than the outer surface of the inner outlet part (21121).

[0058] Here, the outer casing (2111) and the inner connecting portion (21122) of the inner tube (2112) are connected using a connecting bolt (2113), thereby allowing the outer casing (2111) and the inner tube (2112) to be easily connected or separated. That is, the connecting bolt (2113) penetrates the outer casing (2111) and is connected to the inner connecting portion (21122) of the inner tube (2112).

[0059] And, on the outer side of the outer side (2111) where the inner connection part (21123) is located, an air supply member (212) is coupled, and accordingly, an air receiving space capable of sufficiently accommodating air from the air supply member (212) can be secured between the inner tube (2112) and the outer side (2111).

[0060] Accordingly, the air injection passage (3) is formed between the outer outlet (21111) of the outer casing (2111) and the inner outlet (21121) of the inner tube (2112), and can inject air supplied from the air supply member (212) toward the opening (122) and the beading portion (123) of the can (12). At this time, the injection force of the air injection passage (3) can be adjusted by the amount of air supplied from the air supply member (212).

[0061] And the air recovery passage (4) is formed to be connected from the center, which is the interior of the inner tube (2112), to the recovery port formed in the outer recovery section (21112) of the outer tube (2111). That is, the air recovery passage (4) has a structure in which the passage formed in the center of the inner tube (2112) and the passage formed in the center of the air recovery section of the outer tube (2111) are connected. Accordingly, air discharged from the interior of the can (12) can be recovered.

[0062] Meanwhile, the air recovery section of the can (12) is equipped with an air recovery member (213) for forcibly recovering air. That is, the air recovery member (213) uses suction force to forcibly suck in and remove air that has entered the air recovery section.

[0063] Meanwhile, the outer diameter of the inner outlet portion (21121) may be formed to be smaller than the inner diameter of the opening (122). Accordingly, air can be stably sprayed into the beading portion (123) of the can (12) as air flows between the inner outlet portion (21121) and the opening (122), and as a result, the electrolyte (15) remaining in the beading portion (123) can be effectively removed.

[0064] Meanwhile, the inner outlet portion (21121) may be formed to protrude further toward the can (12) than the outer outlet portion (21111). That is, the end of the outer outlet portion (21111) may be located outside the can, and the end of the inner outlet portion (21121) may be extended to be located inside the opening (122) of the can (12). Accordingly, the phenomenon of the electrolyte removal unit separating from the can (12) during the process of removing the electrolyte (15) remaining in the can (12) through the electrolyte removal unit (21) can be prevented. In particular, by spraying air toward the fold portion between the opening (122) of the can (12) and the beading portion (123), the electrolyte (15) remaining in the fold portion between the opening (122) of the can (12) and the beading portion (123) can be effectively removed.

[0065] Meanwhile, the inner diameter of the outer casing (2111) may be formed to be larger than the outer diameter of the opening (122) of the can (12). Accordingly, even if the outer casing (2111) and the opening (122) of the can (12) are separated by a predetermined distance on the same vertical line, air can be stably sprayed over the entire opening (122) of the can (12), and as a result, the electrolyte (15) remaining in the opening (122) of the can (12) can be effectively removed.

[0066] FIG. 7 is a perspective view showing a sealing member (214) of an electrolyte removal device (2) according to a first embodiment of the present invention.

[0067] Meanwhile, as shown in FIGS. 6 and 7, a sealing member (214) that seals the space between the electrolyte removal unit (21) and the opening (122) of the can (12) may be further included.

[0068] The above sealing member (214) can prevent the electrolyte from scattering to the outside through the space between the electrolyte removal unit (21) and the can (12), and at the same time, induce the electrolyte (15) remaining in the opening (122) and beading portion (123) of the can (12) to flow into the electrode assembly receiving portion (121).

[0069] That is, the sealing member (214) includes a fixing part (2141) fixed to the electrolyte removal unit (21), and a supporting part (2142) supported in a manner that surrounds the outer surface of the opening (122) of the can (12).

[0070] Here, the fixing part (2141) can be fixed to the outer outlet part (21111) of the electrolyte removal unit (21) using an adhesive or a fixing means. In particular, the fixing part (2141) can be detachably fixed to the electrolyte removal unit (21).

[0071] The above support member (2142) is supported at the opening (122) of the can (12) and prevents the electrolyte (15) and air from leaking between the sealing member (214) and the opening (122).

[0072] Meanwhile, the sealing member (214) is provided with a material having cushioning power. For example, the sealing member (214) can be made of polypropylene.

[0073] Meanwhile, a fixing groove (21113) in which the fixing part (2141) is fitted and fixed may be formed on the outer surface of the outer outlet part (21111) of the electrolyte removal unit (21). Accordingly, the fixing force of the sealing member (214) can be increased.

[0074] Meanwhile, the sealing member (214) may further include a projection (2143) that is inserted into the space created by the difference in length between the inner outlet (21121) and the outer outlet (21111) and is supported on the upper surface of the opening (122) of the can (12). That is, the projection (2143) is supported on the upper surface of the opening (122) of the can (12) and can prevent the electrolyte removal unit (21) from colliding with the opening (122).

[0075] Meanwhile, the protrusion (2143) may be provided on a part of the inner surface of the support (2142) corresponding to the space created by the difference in length between the inner outlet (21121) and the outer outlet (21111). Accordingly, air injected from the air injection passage (3) can be injected into the opening (122) without interference from the protrusion (2143).

[0076] Meanwhile, the electrolyte removal device (2) according to the first embodiment of the present invention further includes a jig unit (22) that fixes the can (12) so that it does not move, as shown in FIG. 3.

[0077] Jig unit

[0078] The jig unit (22) has one or more insertion grooves (221) formed on its upper surface into which a can (12) is inserted, and the lower end of the can (12) is inserted into the insertion groove (221), thereby preventing the can (12) from moving forward, backward, left, and right. Here, the insertion groove (221) may further include a pressing means (not shown) for pressing the lower end of the can (12).

[0079] Meanwhile, the electrolyte removal device (2) according to the first embodiment of the present invention may further include a lifting unit that lowers the electrolyte removal unit (21) toward the opening (122) of the can (12) or returns it to its original position, with reference to FIG. 3.

[0080] Elevator unit

[0081] The lifting unit (23) can lower the electrolyte removal unit (21) to a distance from the opening (122) of the can (12) when it is necessary to remove the electrolyte (15) remaining in the can (12), and raise the electrolyte removal unit (21) to a distance from the opening (122) of the can (12) when the electrolyte (15) removal operation is completed.

[0082] Meanwhile, the lifting unit (23) can be provided as a hydraulic cylinder.

[0083] FIG. 8 is a cross-sectional view illustrating the usage state of an electrolyte removal device according to a first embodiment of the present invention, and FIG. 9 is an enlarged view of part B shown in FIG. 8.

[0084] The usage state of the electrolyte removal device (2) according to the first embodiment of the present invention having such a structure is described.

[0085] First, a can (12) requiring removal of residual electrolyte is inserted into the insertion groove (221) of the jig unit (22). Next, the electrolyte removal unit (21) is positioned close to the opening (122) of the can (12) using the lifting unit (23). Then, the support member (2142) provided on the sealing member (214) of the electrolyte removal unit (21) is supported by the opening (122) of the can (12), thereby sealing the space between the electrolyte removal unit (21) and the can (12).

[0086] Next, air is supplied through the air supply member (212). Then, the air from the air supply member (212) is sprayed into the opening (122) and beading part (123) of the can (12) through the air injection passage (3) (between the inner outlet part (21121) of the inner tube (2112) and the outer outlet part (21111) of the outer tube (2111), and as a result, the electrolyte (15) remaining in the opening (122) and beading part (123) of the can (12) and the insulator is scattered in all directions. At this time, since the space between the electrolyte removal unit (21) and the can (12) is sealed by the sealing member (214), the residual electrolyte (15) flows into the electrode assembly receiving portion (121) of the can (12), and as a result, the electrolyte (15) remaining in the opening (122) and beading portion (123) of the can (12) can be removed. In particular, the electrolyte (15) remaining on the upper surface of the insulator also moves and flows into the electrode assembly receiving portion (121) of the can (12) by the air sprayed from the air injection passage (3). As a result, the electrolyte (15) remaining on the upper surface of the insulator can be removed.

[0087] Meanwhile, the air sprayed into the can (12) is discharged out of the can (12) and recovered through the air recovery passage (4) (a passage connecting the center of the inner tube (2112) and the outer recovery section (21112) of the outer tube (2111), and is discharged to the outside through the air recovery member (213).

[0088] Accordingly, the electrolyte removal device (2) according to the first embodiment of the present invention can effectively remove the electrolyte (15) remaining in the opening (122), beading portion (123), and insulator of the can (12), and in particular, can prevent electrolyte impregnation defects by inducing the electrolyte to flow into the electrode assembly receiving portion (121) of the can (12).

[0089] In the following description of other embodiments of the present invention, the same reference numerals are used for components having the same function as the previously described embodiments, and redundant descriptions are omitted.

[0090] [Electrolyte removal device according to the second embodiment of the present invention]

[0091] FIG. 10 is a cross-sectional view illustrating an electrolyte removal unit (21) according to a second embodiment of the present invention.

[0092] As shown in FIG. 10, the electrolyte removal device (2) according to the second embodiment of the present invention includes an electrolyte removal unit (21), and the electrolyte removal unit (21) includes an outer tube (2111) and an inner tube (2112).

[0093] Here, a sealing pad (215) is provided between the inner joint (21122) and the outer part (2111) of the inner tube (2112) to increase the sealing force.

[0094] That is, the sealing pad (215) prevents air from leaking between the inner joint (21122) of the inner tube (2112) and the outer tube (2111).

[0095] Meanwhile, the sealing pad (215) can be made of the same material as the sealing member (214).

[0096] Accordingly, the electrolyte removal device (2) according to the second embodiment of the present invention can increase the sealing force between the inner coupling part (21122) of the inner tube (2112) and the outer tube (2111) by including a sealing pad (215).

[0097] The scope of the present invention is defined by the claims set forth below rather than by the detailed description above, and various embodiments derived from the meaning and scope of the claims and equivalent concepts are possible. Explanation of the symbols

[0098] 1: Secondary battery 11: Electrode assembly 12: Can 121: Electrode assembly receiving portion 122: Opening 123: Bidding Department 13: Cap assembly 14: Insulator 15: Residual electrolyte 2: Electrolyte removal device 21: Electrolyte removal unit 2111: Exterior 21111: Outer exit section 21112: Outer recovery unit 21113: Fixed home 2112: Eunuch 21121: Internal outlet section 21122: Inner joint 21123: Internal connection 212: Air supply member 213: Air recovery component 2113: Connecting bolt 214: Sealing member 2141: Fixed part 2142: Jijibu 2143: Protrusion 215: Sealing pad 22: Jig unit 221: Insertion slot 23: Elevator Unit 3: Air injection passage 4: Air recovery passage

Claims

Claim 1 The electrolyte removal device includes an electrolyte removal unit for removing electrolyte remaining in the opening and beading portion of a can, wherein the electrolyte removal unit comprises: an outer tube located at the opening of the can; an inner tube provided inside the outer tube and divided so as not to allow air to pass between the outer outlet portion and the outer recovery portion of the outer tube; an air injection passage formed between the outer outlet portion of the outer tube and the inner outlet portion of the inner tube, which injects air toward the opening and beading portion of the can to remove electrolyte remaining in the opening and beading portion of the can by introducing it into the electrode assembly receiving portion of the can; and an air recovery passage formed to be connected from the inside of the inner tube to a recovery port formed in the outer recovery portion of the outer tube and recovering air discharged from the inside of the can, wherein the inner outlet portion is formed to protrude further toward the can than the outer outlet portion. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 An electrolyte removal device according to claim 1, wherein the outer diameter of the inner outlet portion is formed to be smaller than the inner diameter of the opening. Claim 6 delete Claim 7 An electrolyte removal device according to claim 1, wherein the inner diameter of the outer casing is formed to be larger than the outer diameter of the opening of the can. Claim 8 An electrolyte removal device according to claim 1, wherein the inner tube comprises: an inner outlet portion provided at a predetermined distance from the outer outlet portion of the outer tube; an inner coupling portion coupled to the outer tube and dividing the outer outlet portion and the outer recovery portion so as not to allow air to pass between them; and an inner connecting portion connecting the inner coupling portion and the inner outlet portion and having a diameter smaller than that of the inner outlet portion, and wherein an air supply member is coupled to the outer side of the outer tube where the inner connecting portion is located to supply air. Claim 9 An electrolyte removal device according to claim 1, further comprising a sealing member that seals the space between the electrolyte removal unit and the opening of the can. Claim 10 An electrolyte removal device according to claim 9, wherein the sealing member comprises a fixing part fixed to the electrolyte removal unit and a supporting part supported in a manner that surrounds the outer surface of the opening of the can. Claim 11 An electrolyte removal device according to claim 10, wherein a fixing groove is formed on the outer side of the outer outlet portion, into which the fixing portion is inserted and fixed. Claim 12 An electrolyte removal device according to claim 10, wherein the sealing member further comprises a projection that is inserted into the space created by the difference in length between the inner outlet portion and the outer outlet portion and is supported on the surface of the opening of the can. Claim 13 An electrolyte removal device according to claim 12, wherein the projection is provided on a part of the inner surface of a support corresponding to the space created by the difference in length between the inner outlet and the outer outlet. Claim 14 An electrolyte removal device according to claim 1, further comprising a jig unit for fixing the can so that it does not move. Claim 15 An electrolyte removal device according to claim 1, further comprising a lifting unit for lowering the electrolyte removal unit toward the opening of the can or returning it to its original position. Claim 16 In claim 8, the inner coupling portion is an electrolyte removal device coupled to the outer portion through a coupling bolt.

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