Electrolyte removing device

Abstract

The electrolyte removing device of the present invention comprises an electrolyte removing unit for removing an electrolyte remaining in an opening part and a beading part of a can. The electrolyte removing unit comprises an air injection passage for injecting air toward the opening part and the beading part of the can such that the electrolyte remaining in the opening part and the beading part of the can flows into an electrode assembly receiving part of the can and thus is removed.

Description

Electrolyte removal device

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2023-0130845, filed September 27, 2023, and Korean Patent Application No. 10-2024-0130643, filed September 26, 2024, the entire contents of which are incorporated herein by reference.

[0003] Technology field

[0004] The present invention relates to an electrolyte removal device capable of removing electrolyte remaining in the opening and beading portion of a can and electrolyte remaining on the upper portion of an insulator after an electrolyte impregnation process by introducing the electrolyte into the interior of the can.

[0005] In general, a secondary battery is a battery that can be charged and discharged, unlike a primary battery that cannot be recharged. These secondary batteries are widely used in advanced electronic devices such as phones, laptop computers, and camcorders.

[0006] The above-mentioned secondary batteries are classified into can-type secondary batteries in which the electrode assembly is built into a metal can, and pouch-type secondary batteries in which the electrode assembly is built into a pouch.

[0007] The above can-type secondary battery includes an electrode assembly, an electrolyte, a can containing the electrode assembly and the electrolyte, and a cap assembly mounted in an opening of the can. The pouch-type secondary battery includes an electrode assembly, an electrolyte, and a pouch containing the electrode assembly and the electrolyte.

[0008] Meanwhile, the method for manufacturing the can-type secondary battery includes a process for manufacturing a can having an opening, a beading portion, and a receiving portion, a process for receiving an electrode assembly in the receiving portion of the can and arranging an insulator on top of the electrode assembly, a process for injecting an electrolyte into the receiving portion and impregnating the electrode assembly, and a process for arranging a cap assembly in the opening of the can and then clamping and fixing the opening.

[0009] Here, the can manufacturing process includes a process of forming a plating layer on the surface of the can to prevent rust, and a process of cutting the opening end of the can to improve quality.

[0010] However, after the electrolyte injection process, there was a problem that a poor bond between the can and the cap assembly could occur due to the electrolyte remaining in the opening and beading of the can, and the electrolyte remaining on the upper part of the insulator prevented the electrode assembly from being sufficiently impregnated with the electrolyte. In particular, there was a problem that rust occurred at the end of the opening due to the remaining electrolyte when the plating layer was removed as the end of the opening was cut.

[0011] The present invention aims to provide an electrolyte removal device capable of increasing the bonding between a can and a cap assembly, increasing the impregnation property of the electrolyte, and, in particular, preventing rust from forming at the end of the opening of the can, by removing the electrolyte remaining in the opening and beading portion of the can and the electrolyte remaining on the upper portion of the insulator by introducing the electrolyte into the interior of the can.

[0012] The electrolyte removal device of the present invention includes an electrolyte removal unit that removes electrolyte remaining in an opening and a beading portion of a can, and the electrolyte removal unit may include an air injection passage that injects air toward the opening and the beading portion of the can to cause the electrolyte remaining in the opening and the beading portion of the can to flow into an electrode assembly receiving portion of the can to remove it.

[0013] The above electrolyte removal unit may further include an air recovery passage for recovering air discharged from inside the can.

[0014] The above electrolyte removal unit may have an air injection passage formed on the rim for spraying air toward the opening and beading portion of the can, and an air recovery passage formed on the inside closer to the center than the rim for recovering air discharged from the inside of the can.

[0015] The electrolyte removal unit includes an outer shell positioned at the opening of the can; and an inner tube provided inside the outer shell and dividing the outer outlet portion of the outer shell and the outer recovery portion so that air cannot pass therebetween, and the air injection passage is formed between the outer outlet portion of the outer shell and the inner outlet portion of the inner tube and injects air toward the opening and the beading portion of the can, and the air recovery passage is formed to be connected from the inside of the inner tube to a recovery port formed at the outer recovery portion of the outer shell and can recover air discharged from the inside of the can.

[0016] The outer diameter of the inner outlet portion may be formed smaller than the inner diameter of the opening portion.

[0017] The inner outlet portion may be formed to protrude further toward the can than the outer outlet portion.

[0018] The inner diameter of the above-mentioned outer appearance can be formed to be larger than the outer diameter of the opening of the can.

[0019] The inner tube may include an inner outlet portion provided at a predetermined interval with respect to the outer outlet portion of the outer outer body; an inner connecting portion coupled to the outer body and dividing the outer outlet portion and the outer recovery portion so that air cannot pass between them; and an inner connecting portion connecting the inner connecting portion and the inner outlet portion and having a diameter smaller than the inner outlet portion, and an air supply member supplying air to the outer side of the outer body where the inner connecting portion is located.

[0020] It may further include a sealing member that seals between the electrolyte removal unit and the opening of the can.

[0021] The above sealing member may include a fixing member fixed to the electrolyte removal unit, and a supporting member supported in a form that surrounds the outer circumference of the opening of the can.

[0022] A fixing groove may be formed on the outside of the outer outlet portion to which the fixing portion is inserted and fixed.

[0023] The inner outlet portion may be formed to protrude further toward the can than the outer outlet portion, and the sealing member may further include a protrusion that is inserted into a space created by a difference in length between the inner outlet portion and the outer outlet portion and is supported on the opening surface of the can.

[0024] The above protrusion may be provided on a portion of the inner surface of the support portion corresponding to the space created by the difference in length between the inner outlet portion and the outer outlet portion.

[0025] The above can may further include a jig unit that fixes the can so that it does not move.

[0026] It may further include an elevating unit for lowering the electrolyte removal unit toward the opening of the can or returning it to its original position.

[0027] The above inner joint can be joined to the outer part via a joining bolt.

[0028] The electrolyte removal device of the present invention is characterized by including an electrolyte removal unit. This feature allows the electrolyte remaining in the opening and beading portion of the can to be removed by flowing it into the interior of the can, thereby enhancing the bonding between the can and the cap assembly, enhancing the impregnation of the electrolyte, and, in particular, preventing rust from forming at the end of the opening of the can.

[0029] 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 edge and an air recovery passage formed at the center. Due to these features, electrolyte remaining in the opening and beading portion of the can can be quickly removed, and air discharged from the interior of the can can be quickly recovered.

[0030] In addition, the electrolyte removal unit of the electrolyte removal device of the present invention has a double structure, including an outer tube and an inner tube, an air injection passage formed between an outer outlet portion of the outer tube and an inner outlet portion of the inner tube, and an air recovery passage 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 the efficiency of manufacturing.

[0031] Meanwhile, the electrolyte removal unit of the electrolyte removal device of the present invention has a characteristic in that the outer diameter of the inner outlet of the inner tube is formed smaller than the inner diameter of the opening of the can. This characteristic enables stable injection of air into the opening and beading portion of the can, and prevents interference between the inner tube and the can.

[0032] Meanwhile, in the electrolyte removal unit of the electrolyte removal device of the present invention, the inner outlet of the inner tube is formed to protrude further toward the can than the outer outlet of the outer tube. This feature allows air to be stably injected to the beading portion of the can, thereby completely removing any electrolyte remaining in the beading portion.

[0033] Meanwhile, in the electrolyte removal unit of the electrolyte removal device of the present invention, the inner tube includes an inner outlet portion, an inner connecting portion, and an inner connecting portion having a smaller diameter than the inner outlet portion, and an air supply member is connected 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 the air injection passage formed between the inner outlet portion of the inner tube and the outer outlet portion of the outer tube.

[0034] Meanwhile, the electrolyte removal device of the present invention is characterized in that it further includes 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, and accordingly, the electrolyte remaining in the can can be prevented from scattering in all directions by the air sprayed from the electrolyte removal unit. In particular, the electrolyte remaining in the can and the electrolyte remaining on the upper portion of the insulator arranged in the electrode assembly receiving portion of the can can be induced to flow into the electrode assembly receiving portion of the can, thereby removing them. This can increase the electrolyte impregnation capacity.

[0035] Meanwhile, in the electrolyte removal device of the present invention, the sealing member is inserted into a space created by the difference in length between the inner outlet of the inner tube and the outer outlet of the outer tube, and is characterized by including a protrusion supported on the upper surface of the opening of the can. This characteristic can prevent collision and noise generation between the can and the electrolyte removal unit.

[0036] Figure 1 is a cross-sectional view illustrating a secondary battery according to a first embodiment of the present invention.

[0037] Figure 2 is a cross-sectional view showing a can containing an electrode assembly after an electrolyte impregnation process.

[0038] Figure 3 is a process diagram illustrating an electrolyte removal device according to the first embodiment of the present invention.

[0039] Figure 4 is a perspective view showing an electrolyte removal unit of an electrolyte removal device according to the first embodiment of the present invention.

[0040] Figure 5 is a cross-sectional view of Figure 4.

[0041] Figure 6 is an enlarged view of part A shown in Figure 5.

[0042] Fig. 7 is a perspective view illustrating a sealing member of an electrolyte removal device according to a first embodiment of the present invention.

[0043] Figure 8 is a cross-sectional view showing the state of use of the electrolyte removal device according to the first embodiment of the present invention.

[0044] Figure 9 is an enlarged view of part B shown in Figure 8.

[0045] Fig. 10 is a cross-sectional view illustrating an electrolyte removal unit according to a second embodiment of the present invention.

[0046] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In addition, in the drawings, parts irrelevant to the description have been omitted to clearly explain the present invention, and similar parts have been designated with similar reference numerals throughout the specification.

[0047] [Secondary battery according to the first embodiment of the present invention]

[0048] 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.

[0049] A secondary battery (1) according to a first embodiment of the present invention, as illustrated in FIG. 1, includes an electrode assembly (11), a can (12) that accommodates the electrode assembly (11), a cap assembly (13) 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).

[0050] The above 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.

[0051] The above can (12) has a structure that opens in one direction (upward when viewed from FIG. 1), and includes an opening (122) which is an entrance, 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 sequentially arranged in the vertical direction.

[0052] A method for manufacturing a secondary battery having the above structure includes a process for manufacturing a can (12) having an opening (122), a beading portion (123), and an electrode assembly receiving portion (121), a process for receiving an electrode assembly (11) and an insulator (14) in the electrode assembly receiving portion of the can (12), a process for injecting an electrolyte (15) into the can (12) to impregnate the electrode assembly (11), and a process for inserting a cap assembly (13) into the opening (122) of the can (12) and clamping it to fix the cap assembly (13).

[0053] As illustrated in FIG. 2, after the electrolyte (15) impregnation process, the electrolyte (15) remains on the opening (122) and beading portion (123) of the can (12) and the upper surface of the insulator (14), and this residual electrolyte (15) may cause problems such as poor bonding between the can (12) and the cap assembly (13) and rust on the opening (122) of the can (12). In particular, poor impregnation may occur as the amount of electrolyte (15) impregnated into the electrode assembly (11) decreases.

[0054] To solve this problem, 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, the electrolyte removal device (2) according to the first embodiment of the present invention is used.

[0055] That is, the electrolyte removal device (2) according to the first embodiment of the present invention can prevent poor electrolyte (15) impregnation by removing 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, by introducing the electrolyte (15) remaining on the upper surface of the insulator (14) into the electrode assembly receiving portion (121).

[0056] Hereinafter, an electrolyte removal device (2) according to a first embodiment of the present invention will be described in detail with reference to the attached drawings.

[0057] [Electrolyte removal device according to the first embodiment of the present invention]

[0058] 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 the 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 shown in FIG. 5.

[0059] 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, as shown in FIGS. 3 and 4.

[0060] Electrolyte removal unit

[0061] The above electrolyte removal unit (21) has a structure that uses air to remove the electrolyte (15) remaining in the opening (122), beading portion (123) and insulator (14) of the can (12) by introducing it into the interior of the can.

[0062] That is, the electrolyte removal unit (21) has an air injection passage (3) that injects 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 air discharged from the interior of the can (12).

[0063] That is, the electrolyte removal unit (21) injects air into the can (12) through the air injection passage (3) to remove the electrolyte (15) remaining in the opening (122), beading portion (123) and insulator of the can (12) by introducing it into the interior of the can. Then, the air injected into the interior of the can (12) is discharged to the outside, and at this time, 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 portion and insulator of the can (12) can be stably removed.

[0064] To explain in more detail, the electrolyte removal unit (21) has an air injection passage (3) formed on the edge for injecting 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 edge for recovering air discharged from the inside of the can (12). That is, an air injection passage is formed on the edge of the electrolyte removal unit, and an air recovery passage is formed in the center. Accordingly, by injecting air through the air injection passage (3) formed on the edge, the electrolyte (15) remaining in the opening (122), beading portion (123) of the can (12), and the insulator can be introduced into the inside of the can and removed, and the air discharged from the can (12) can be recovered through the air recovery passage (4) formed in the center.

[0065] For example, the electrolyte removal unit (21) includes an outer body (2111) positioned in the opening (122) of the can (12); and an inner tube (2112) provided inside the outer body (2111) and dividing the outer outlet (21111) and the outer recovery portion (21112) of the outer body (2111) so that air cannot pass between them. That is, the outer body (2111) and the inner tube (2112) have a double tube structure.

[0066] The above outer appearance (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 appearance.

[0067] The inner tube (2112) includes an inner outlet (21121) provided at a predetermined interval with respect to the outer outlet (21111) of the outer tube (2111), an inner connecting portion (21122) coupled to the outer tube (2111) and dividing the outer outlet (21111) and the outer recovery portion (21112) so that air cannot pass through, and an inner connecting portion (21123) connecting the inner connecting portion (21122) and the inner outlet (21121) and having a smaller diameter than the inner outlet (21121).

[0068] That is, the outer surface of the inner connecting portion (21123) has a smaller diameter than the outer surface of the inner outlet portion (21121).

[0069] Here, the outer body (2111) and the inner joint portion (21122) of the inner tube (2112) are joined using a joining bolt (2113), thereby allowing the outer body (2111) and the inner tube (2112) to be easily joined or separated. That is, the joining bolt (2113) penetrates the outer body (2111) and is joined to the inner joint portion (21122) of the inner tube (2112).

[0070] And, on the outside of the outer body (2111) where the inner connection part (21123) is located, an air supply member (212) is coupled, and accordingly, an air receiving space that can sufficiently receive air of the air supply member (212) can be secured between the inner tube (2112) and the outer body (2111).

[0071] Accordingly, the air injection passage (3) is formed between the outer outlet (21111) of the outer body (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 beading member (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).

[0072] And the air recovery passage (4) is formed to be connected from the center of the inner part of the inner tube (2112) to the recovery port formed in the outer recovery part (21112) of the outer part (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 part of the outer part (2111) are connected. Accordingly, the air discharged from the inside of the can (12) can be recovered.

[0073] Meanwhile, the air recovery unit 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 power to forcibly suck in and remove air that has entered the air recovery unit.

[0074] Meanwhile, the outer diameter of the inner outlet portion (21121) may be formed smaller than the inner diameter of the opening portion (122). Accordingly, as air flows in between the inner outlet portion (21121) and the opening portion (122), air can be stably sprayed onto the beading portion (123) of the can (12), and as a result, the electrolyte (15) remaining in the beading portion (123) can be effectively removed.

[0075] 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 positioned outside the can, and the end of the inner outlet portion (21121) may be extended to be positioned inside the opening portion (122) of the can (12). Accordingly, during the process of removing the electrolyte (15) remaining in the can (12) through the electrolyte removal unit (21), the phenomenon of the electrolyte removal unit being separated from the can (12) can be prevented. In particular, by spraying air toward the folded portion between the opening portion (122) and the beading portion (123) of the can (12), the electrolyte (15) remaining in the folded portion between the opening portion (122) and the beading portion (123) of the can (12) can be effectively removed.

[0076] Meanwhile, the inner diameter of the outer appearance (2111) may be formed to be larger than the outer diameter of the opening (122) of the can (12). Accordingly, even if the outer appearance (2111) and the opening (122) of the can (12) are spaced apart by a predetermined distance on the same vertical line, air can be stably sprayed to 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.

[0077] Figure 7 is a perspective view showing a sealing member (214) of an electrolyte removal device (2) according to the first embodiment of the present invention.

[0078] Meanwhile, as shown in FIGS. 6 and 7, a sealing member (214) may be further included to seal the space between the electrolyte removal unit (21) and the opening (122) of the can (12).

[0079] The above sealing member (214) can prevent the electrolyte from scattering to the outside between the electrolyte removal unit (21) and the can (12), and at the same time, can 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).

[0080] That is, the sealing member (214) includes a fixing member (2141) fixed to the electrolyte removal unit (21), and a support member (2142) supported in a form that surrounds the outer circumference of the opening (122) of the can (12).

[0081] Here, the fixed 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 fixed part (2141) can be detachably fixed to the electrolyte removal unit (21).

[0082] The above support member (2142) is supported by 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).

[0083] Meanwhile, the sealing member (214) is made of a material having buffering power. For example, the sealing member (214) can be made of polypropylene.

[0084] Meanwhile, a fixing groove (21113) may be formed on the outer surface of the outer outlet portion (21111) of the electrolyte removal unit (21), into which the fixing portion (2141) is fitted and fixed. Accordingly, the fixing force of the sealing member (214) can be increased.

[0085] Meanwhile, the sealing member (214) may further include a protrusion (2143) that is inserted into a space created by a 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 protrusion (2143) may be supported on the upper surface of the opening (122) of the can (12) and prevent the electrolyte removal unit (21) from colliding with the opening (122).

[0086] Meanwhile, the protrusion (2143) may be provided on a portion 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).

[0087] 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.

[0088] jig unit

[0089] The jig unit (22) has one or more insertion grooves (221) formed on the upper surface into which a can (12) is inserted, and when the lower end of the can (12) is inserted into the insertion groove (221), the can (12) can be prevented from moving forward, backward, left, and right. Here, the insertion groove (221) may further include a pressurizing means (not shown) for pressurizing the lower end of the can (12).

[0090] Meanwhile, the electrolyte removal device (2) according to the first embodiment of the present invention may further include an elevating unit that lowers or returns the electrolyte removal unit (21) toward the opening (122) of the can (12) as shown in FIG. 3.

[0091] Elevator unit

[0092] When it is necessary to remove the electrolyte (15) remaining in the can (12), the lifting unit (23) can lower the electrolyte removal unit (21) to be close to the opening (122) of the can (12), and when the electrolyte (15) removal work is completed, the electrolyte removal unit (21) can be raised away from the opening (122) of the can (12).

[0093] Meanwhile, the lifting unit (23) can be provided with a hydraulic cylinder.

[0094] Fig. 8 is a cross-sectional view showing the state of use of the electrolyte removal device according to the first embodiment of the present invention, and Fig. 9 is an enlarged view of part B shown in Fig. 8.

[0095] The usage state of the electrolyte removal device (2) according to the first embodiment of the present invention having such a structure is described.

[0096] 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).

[0097] Next, air is supplied through the air supply member (212). Then, the air of the air supply member (212) is injected into the opening (122) and the beading part (123) of the can (12) through the air injection passage (3) (between the inner outlet (21121) of the inner tube (2112) and the outer outlet (21111) of the outer tube (2111), and as a result, the electrolyte (15) remaining in the opening (122) and the beading part (123) of the can (12) and the insulator are 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 is also moved by the air injected from the air injection passage (3) and flows into the electrode assembly receiving portion (121) of the can (12). As a result, the electrolyte (15) remaining on the upper surface of the insulator can be removed.

[0098] Meanwhile, the air injected into the can (12) is discharged outside 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 discharged to the outside through the air recovery member (213).

[0099] Therefore, 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 poor electrolyte impregnation by inducing it to flow into the electrode assembly receiving portion (121) of the can (12).

[0100] Hereinafter, in describing other embodiments of the present invention, the same component symbols are used for components having the same functions as the above-described embodiments, and duplicate descriptions are omitted.

[0101] [Electrolyte removal device according to the second embodiment of the present invention]

[0102] Fig. 10 is a cross-sectional view showing an electrolyte removal unit (21) according to a second embodiment of the present invention.

[0103] The electrolyte removal device (2) according to the second embodiment of the present invention includes an electrolyte removal unit (21), as shown in FIG. 10, and the electrolyte removal unit (21) includes an outer body (2111) and an inner body (2112).

[0104] Here, a sealing pad (215) is provided between the inner joint (21122) of the inner tube (2112) and the outer tube (2111) to increase the sealing force.

[0105] 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).

[0106] Meanwhile, the sealing pad (215) can be made of the same material as the sealing member (214).

[0107] Therefore, the electrolyte removal device (2) according to the second embodiment of the present invention can increase the sealing force between the inner joint (21122) of the inner tube (2112) and the outer body (2111) by including a sealing pad (215).

[0108] The scope of the present invention is indicated by the claims described below rather than the detailed description above, and various embodiments are possible derived from the meaning and scope of the claims and their equivalent concepts.

[0109] [Explanation of symbols]

[0110] 1: Secondary battery

[0111] 11: Electrode assembly

[0112] 12: Can

[0113] 121: Electrode assembly receiving section

[0114] 122: Aperture

[0115] 123: Bidding Department

[0116] 13: Cap assembly

[0117] 14: Insulator

[0118] 15: Residual electrolyte

[0119] 2: Electrolyte removal device

[0120] 21: Electrolyte removal unit

[0121] 2111: Appearance

[0122] 21111: Outer exit

[0123] 21112: Outer recovery section

[0124] 21113: Fixed home

[0125] 2112: Inner chamber

[0126] 21121: Inner outlet

[0127] 21122: Inner joint

[0128] 21123: Inner joint

[0129] 212: Air supply failure

[0130] 213: Air recovery member

[0131] 2113: Combination Bolt

[0132] 214: Sealing member

[0133] 2141: Fixed part

[0134] 2142: Support

[0135] 2143: Protrusion

[0136] 215: Sealing pad

[0137] 22: Jig unit

[0138] 221: Insertion groove

[0139] 23: Elevator unit

[0140] 3: Air injection passage

[0141] 4: Air recovery passage

Claims

1. Includes an electrolyte removal unit that removes electrolyte remaining in the opening and beading portion of the can. The above electrolyte removal unit, An electrolyte removal device including an air injection passage that injects air toward the opening and beading portion of the can to remove the electrolyte remaining in the opening and beading portion of the can by introducing it into the electrode assembly receiving portion of the can.

2. In claim 1, The above electrolyte removal unit, An electrolyte removal device further comprising an air recovery passage for recovering air discharged from inside the can.

3. In claim 2, The above electrolyte removal unit, An electrolyte removal device in which an air injection passage is formed on the rim for spraying air toward the opening and beading portion of the can, and an air recovery passage is formed on the inner side closer to the center than the rim for recovering air discharged from the inside of the can.

4. In claim 3, The above electrolyte removal unit, an exterior located at the opening of the above can; and It includes an inner tube provided inside the outer appearance and dividing the outer outlet portion and the outer recovery portion of the outer appearance so that air does not pass through, The above air injection passage is formed between the outer outlet of the outer appearance and the inner outlet of the inner tube, and sprays air toward the opening and beading of the can. The above air recovery passage is formed to be connected from the inside of the inner tube to the recovery port formed on the outer recovery part of the outer tube, and is an electrolyte removal device that recovers air discharged from the inside of the can.

5. In claim 4, An electrolyte removal device in which the outer diameter of the inner outlet portion is formed smaller than the inner diameter of the opening portion.

6. In claim 4, An electrolyte removal device in which the inner outlet portion is formed to protrude further toward the can than the outer outlet portion.

7. In claim 4, An electrolyte removal device in which the inner diameter of the above-mentioned exterior is formed larger than the outer diameter of the opening of the can.

8. In claim 4, The above inner organ is, An inner outlet provided at a predetermined interval with respect to the outer outlet of the above appearance; An inner joint that is coupled to the exterior and divides the outer outlet portion and the outer recovery portion so that air cannot pass between them; and Connecting the inner joint portion and the inner outlet portion, and including an inner connecting portion having a diameter smaller than the inner outlet portion, An electrolyte removal device in which an air supply member for supplying air is connected to the outer side of the outer surface where the inner connection part is located.

9. In claim 4, An electrolyte removal device further comprising a sealing member that seals between the electrolyte removal unit and the opening of the can.

10. In claim 9, The above sealing member is, A fixing part fixed to the above electrolyte removal unit, and An electrolyte removal device including a support member that is supported in a form that surrounds the outer circumference of the opening of the can.

11. In claim 10, An electrolyte removal device in which a fixing groove is formed on the outside of the outer outlet portion, into which the fixing portion is inserted and fixed.

12. In claim 10, The inner outlet portion is formed to protrude further toward the can than the outer outlet portion, An electrolyte removal device wherein the sealing member is inserted into a space created by a difference in length between the inner outlet portion and the outer outlet portion, and further includes a protrusion supported on the surface of the opening portion of the can.

13. In claim 12, The above protrusion is an electrolyte removal device provided on a part of the inner surface of the support corresponding to the space created by the difference in length between the inner outlet and the outer outlet.

14. In claim 1, An electrolyte removal device further comprising a jig unit for fixing the can so that it does not move.

15. In claim 1, An electrolyte removal device further comprising an elevating unit for lowering the electrolyte removal unit toward the opening of the can or returning it to its original position.

16. In claim 8, The above inner joint is an electrolyte removal device that is joined to the outer surface through a joining bolt.

Images