Pellets for electrolyte injection and electrolyte injection method

Abstract

The present invention relates to pellets for electrolyte injection, which are configured to connect between an electrolyte supply device for supplying an electrolyte and an opening formed on one side of a housing of a battery. The pellets each include: a hopper having a hollow structure; and a sealing member having a hopper coupling portion coupled to the hopper and configured to be spaced apart from the housing, and a battery sealing portion sealing the opening and configured to be at least partially spaced apart from the hopper coupling portion.

Description

Electrolyte injection pellets and electrolyte injection method

[0001] The present invention relates to a pellet for electrolyte injection and a method for electrolyte injection.

[0002] This application claims priority to Korean Patent Application No. 10-2023-0193120, filed on December 27, 2023, and all contents disclosed in the specification and drawings of the said application are incorporated herein by reference.

[0003] This application claims priority to Korean Patent Application No. 10-2024-0004944, filed on January 11, 2024, and all contents disclosed in the specification and drawings of the said application are incorporated by reference into this application.

[0004] The interior of a secondary battery may accommodate an electrolyte together with an electrode assembly. In the manufacture of a secondary battery, a hole may be formed again for the injection of an electrolyte after the sealing of the housing constituting the secondary battery is completed, or the electrolyte may be injected before the housing is sealed and then the housing is sealed.

[0005] Regardless of which of these methods is used, it is necessary to prevent electrolyte leakage from the secondary battery during the electrolyte injection process. To prevent leakage, the connection between the injection device and the secondary battery must be properly sealed.

[0006] For example, in the case of a cylindrical secondary battery, the injection of the electrolyte can be performed after the electrode assembly is inserted through an opening on one side of the housing. The injection of the electrolyte can be performed by inserting one side of a pellet configured to connect between a device for supplying the electrolyte and the secondary battery into the opening on the housing of the secondary battery, and supplying the electrolyte using an electrolyte supply device connected to the other side of the pellet.

[0007] In this case, the end of the pellet inserted into the opening of the housing may be pressed against the beading portion formed in the housing. The inner surface of the beading portion formed by pressing the perimeter of the housing inward may not be a completely flat surface, and other components may be positioned on the beading portion. Therefore, even if the end of the pellet is pressed against the beading portion, there is a possibility that the sealing of the connection between the pellet and the secondary battery may be incomplete.

[0008] Meanwhile, sealing of the connection portion can be achieved by forming the outer diameter or width of the end of the pellet to be substantially the same as the inner diameter or width of the housing, thereby allowing the pellet to adhere closely to the inner surface of the side wall of the housing. However, if the size of the end of the pellet is increased to strengthen the sealing, the process of inserting the pellet into the secondary battery will inevitably become difficult, and if the size of the end of the pellet is reduced to facilitate pellet insertion, the sealing will inevitably be weakened.

[0009] Therefore, development of an electrolyte injection pellet having a structure that can solve these problems is required.

[0010] The present invention was created in consideration of the above-described problems, and has as its primary purpose the provision of a pellet that facilitates the process of inserting an electrolyte injection pellet into a battery, and also enhances the sealing properties at the connection point between the pellet and the battery.

[0011] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0012] According to one embodiment of the present invention for solving the above-described problem, a pellet for electrolyte injection is configured to connect between an electrolyte supply device that supplies electrolyte and an opening formed on one side of a housing of a battery, the pellet including a hopper having a hollow structure; and a sealing member having a hopper coupling portion coupled to the hopper and configured to be spaced apart from the housing, and a battery sealing portion configured to seal the opening and to be spaced apart from the hopper coupling portion at least in part.

[0013] The above hopper coupling portion may be configured to come closer to the housing as it is pressed in the direction toward the battery.

[0014] The above hopper coupling portion may be configured such that its end is pressed against the upper portion of the housing as it is pressed in the direction toward the battery.

[0015] The gap between the hopper coupling portion and the battery sealing portion may be configured to increase at least partially in the outward direction.

[0016] The above battery sealing portion may be configured so that its end moves outward and comes into close contact with the inner surface of the housing as pressure is applied in the direction toward the battery.

[0017] The above battery sealing portion may be configured to have an inner diameter or inner width that increases as it moves away from the hopper.

[0018] The above battery sealing portion may be configured to have a thickness that decreases as it moves away from the hopper.

[0019] The battery sealing portion may be configured such that when pressure is applied in a direction toward the battery, its end slides toward the outside of the battery on a beading portion provided in the housing of the battery.

[0020] The above battery sealing portion may be configured so that its end is pressed against the inner surface of the housing above the beading portion as it is pressed in the direction toward the battery.

[0021] The above battery sealing portion may be configured so that its end is pressed against the upper surface of the current collector positioned on the beading portion as it is pressed in the direction toward the battery.

[0022] In addition, an electrolyte injection method according to an embodiment of the present invention for solving the above-described problem is an electrolyte injection method for injecting an electrolyte into a battery through an opening formed on one side of a housing of the battery, the method including an insertion step of inserting an electrolyte injection pellet into the opening; a mounting step of mounting a sealing member provided in the pellet on a beading part provided in the housing; a sealing step of pressing a hopper coupling part of the sealing member toward the beading part so that the hopper coupling part is in close contact with an upper end of the housing; and an injection step of injecting an electrolyte into the interior of the housing through the pellet.

[0023] The sealing step may include a sealing step in which an end of the battery sealing portion of the sealing member moves outward as the hopper coupling portion is pressed toward the beading portion so as to be in close contact with the inner surface of the housing.

[0024] The above-mentioned sealing step may be performed by sliding an end of the battery sealing portion of the sealing member toward the outside of the battery on the beading portion so that the outer surface of the battery sealing portion is in close contact with the inner surface of the housing.

[0025] According to one aspect of the present invention, during the process of inserting an electrolyte injection pellet into a battery, the upper part of the battery is sealed using the load of the pellet, thereby making it easier to strengthen the sealing at the connection point between the pellet and the battery.

[0026] In addition, according to another aspect of the present invention, since the outer surface of the battery sealing portion and the inner surface adjacent to the end of the battery housing are in close contact, leakage of the electrolyte flowing toward the opening of the battery housing along the beading portion of the battery housing can be effectively prevented.

[0027] In addition, according to another aspect of the present invention, the battery sealing portion double seals the upper part and the inner side of the battery housing, thereby effectively preventing leakage of electrolyte when electrolyte is injected into the battery.

[0028] In addition, the present invention may have various other effects, which will be described in each embodiment configuration, or an explanation of effects that can be easily inferred by a person skilled in the art will be omitted.

[0029] The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the invention described below, serve to further understand the technical idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in such drawings.

[0030] FIG. 1 is a drawing showing a pellet according to one embodiment of the present invention before being connected to a battery.

[0031] FIG. 2 is a drawing showing a pellet connected to a battery according to one embodiment of the present invention.

[0032] Figure 3 is a perspective view showing a sealing member according to one embodiment of the present invention.

[0033] Fig. 4 is a cross-sectional view showing a sealing member according to one embodiment of the present invention.

[0034] Fig. 5 is a cross-sectional view showing a connection structure between a sealing member and a battery according to one embodiment of the present invention.

[0035] FIG. 6 is a cross-sectional view showing a state in which a sealing member according to one embodiment of the present invention is pressed in a direction toward a battery.

[0036] Figure 7 is an enlarged view of part A of Figure 6.

[0037] Fig. 8 is a cross-sectional view showing a connection structure between a sealing member and a battery according to another embodiment of the present invention.

[0038] Figure 9 is an enlarged view of part B of Figure 8.

[0039] FIG. 10 is a drawing showing a connection structure between a sealing member and a battery having a current collector according to one embodiment of the present invention.

[0040] Figure 11 is an enlarged view of part C of Figure 10.

[0041] Figure 12 is a plan view of a battery equipped with a current collector plate.

[0042] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concepts of terms to best explain his or her invention, they should be interpreted in a way that aligns with the technical spirit of the present invention.

[0043] Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0044] Furthermore, the present invention includes various embodiments. For each embodiment, redundant descriptions of substantially identical or similar components will be omitted, and the differences will be described.

[0045] In the drawings, the sizes of each component or a specific part of that component are exaggerated, omitted, or schematically illustrated for convenience and clarity of explanation. Therefore, the size of each component does not entirely reflect the actual size. If a detailed description of a related known function or configuration is judged to unnecessarily obscure the gist of the present invention, such description will be omitted. For reference, in this specification, terms indicating directions are terms based on the components shown in the accompanying drawings, and are relative terms that may change depending on the actual position or location of the components.

[0046] Meanwhile, in this specification, terms indicating directions such as up, down, left, right, front, and back may be used, but these terms are only for convenience of explanation, and it is obvious to those skilled in the art that these terms may vary depending on the location of the target object or the location of the observer.

[0047]

[0048] Referring to FIGS. 1 to 4, a pellet (1) according to one embodiment of the present invention will be described.

[0049] FIG. 1 is a drawing showing a pellet according to one embodiment of the present invention before being connected to a battery, and FIG. 2 is a drawing showing a pellet according to one embodiment of the present invention connected to a battery. In addition, FIG. 3 is a perspective view showing a sealing member according to one embodiment of the present invention, and FIG. 4 is a cross-sectional view showing a sealing member according to one embodiment of the present invention.

[0050] Referring to FIGS. 1 to 4, a pellet (1) according to one embodiment of the present invention may be an electrolyte injection pellet configured to connect an electrolyte supply device that supplies an electrolyte and a battery (100).

[0051] In the present invention, a battery (100) that is the target of the electrolyte injection may include an electrode assembly (110) and a housing (120). The battery (100) may be a secondary battery configured to be capable of charging and discharging. The battery (100) may be, for example, a cylindrical battery.

[0052] The electrode assembly (110) may be formed by winding a laminate including a first electrode, a second electrode, and a separator. In addition, the housing (120) may be configured to form an opening to accommodate the electrode assembly (110). The opening may be formed at the upper end of the housing (120). The housing (120) may include a conductive metal. The housing (120) may be electrically connected to the second electrode of the electrode assembly (110).

[0053] A pellet (1) according to one embodiment of the present invention may be an electrolyte injection pellet configured to connect between an electrolyte supply device that supplies electrolyte and an opening formed on one side of a housing (120) of a battery (100).

[0054] The pellet (1) may include a hopper (10) and a sealing member (20). The hopper (10) may have a hollow structure through which the electrolyte supplied by the electrolyte supply device may pass. That is, the hopper (10) may function as a connector connecting the electrolyte supply device and the battery (100) when the electrolyte is injected. The hopper (10) may include a metal material to ensure rigidity. However, the material of the hopper (10) is not limited thereto, and any material that maintains appropriate rigidity and has chemical resistance to the electrolyte passing therethrough may be applied to the hopper (10).

[0055] The sealing member (20) is coupled to the hopper (10) and can be configured to seal the battery (100) at the same time when the electrolyte is injected. The sealing member (20) can be configured to seal the opening of the battery (100).

[0056] The sealing member (20) may include a flexible material to prevent electrolyte from leaking from the joint portion of the hopper (10) and the sealing member (20) and the contact portion of the sealing member (20) and the battery (100). The sealing member (20) may include, for example, a rubber material. The sealing member (20) may have a hollow structure so that its internal space is in communication with the internal space of the hopper (10). The sealing member (20) may have a roughly cylindrical shape with a hollow center.

[0057] More specifically, the sealing member (20) may include a hopper coupling portion (21) and a battery sealing portion (22). The hopper coupling portion (21) may be configured to be coupled to the hopper (10). The hopper coupling portion (21) may have a shape corresponding to one end of the hopper (10). The hopper coupling portion (21) may be configured to surround an outer surface of one end of the hopper (10). In addition, the hopper coupling portion (21) may be configured to be pressed toward the battery (100) by the hopper (10). Referring to FIG. 2, the hopper (10) may be configured to be in contact with the upper end of the hopper coupling portion (21).

[0058] In addition, the hopper coupling portion (21) may be configured to be spaced apart from the housing (120). Specifically, referring to FIG. 2, the lower portion of the hopper coupling portion (21) may be configured to be spaced upward from the opening portion of the housing (120). The outer circumference of the hopper coupling portion (21) may be configured to be larger than the outer circumference of the housing (120). The hopper coupling portion (21) may be configured to contact the upper portion of the housing (120) when pouring the electrolyte.

[0059] The battery sealing portion (22) may be configured to seal the opening of the housing (120). The battery sealing portion (22) may have a shape corresponding to one end of the housing (120). The battery sealing portion (22) may be configured to be spaced apart from the hopper coupling portion (21) by at least a portion thereof. That is, a groove may be formed along the outer circumference of the outer surface of the sealing member (20). The battery sealing portion (22) may be configured to be in close contact with the inner surface of the housing (120) of the battery (100) when the electrolyte is injected.

[0060] According to the above-described embodiment of the present invention, when the electrolyte is injected into the battery (100), the sealing member (20) can simultaneously double-seal the upper portion and the inner surface of the housing (120). This improves the sealing performance at the connection portion between the pellet (1) and the battery (100). Accordingly, according to the above-described embodiment of the present invention, the risk of the electrolyte leaking out of the battery (100) during the process of injecting the electrolyte into the battery can be minimized.

[0061] In addition, when the pellet (1) is not in operation, a phenomenon in which the sealing member (20) hardens may occur. However, according to the above-described embodiment of the present invention, since the hopper coupling portion (21) seals the housing (120) by pressing the upper portion of the housing (120), the sealing property of the battery (100) can be secured even if the sealing member (20) hardens. Accordingly, the efficiency of the process in the electrolyte injection process can be improved.

[0062]

[0063] Next, with reference to FIGS. 5 to 7, the shape change of the sealing member (20) of the present invention as it is pressed in the direction toward the battery (100) will be described in more detail.

[0064] Fig. 5 is a cross-sectional view showing a connection structure between a sealing member and a battery according to one embodiment of the present invention. In addition, Fig. 6 is a cross-sectional view showing a state in which a sealing member according to one embodiment of the present invention is pressed in a direction toward the battery, and Fig. 7 is an enlarged view of portion A of Fig. 6.

[0065] The hopper coupling portion (21) may be configured to come closer to the housing (120) as it is pressed in the direction toward the battery (100). Furthermore, the hopper coupling portion (21) may be configured such that its end (21a) comes into close contact with the upper end of the housing (120) as it is pressed in the direction toward the battery (100). At this time, the end (21a) of the hopper coupling portion (21) may mean a portion facing the housing (120). Alternatively, the end (21a) of the hopper coupling portion (21) may mean the outer lower end of the hopper coupling portion (21). Alternatively, the end (21a) of the hopper coupling portion (21) may mean the outer lower surface of the hopper coupling portion (21).

[0066] According to the above-described embodiment of the present invention, the housing (120) can be sealed in such a way that the hopper coupling portion (21) presses the upper portion of the housing (120). As a result, the sealing performance at the connection portion between the pellet (1) and the battery (100) can be improved. Accordingly, according to the above-described embodiment of the present invention, the risk of the electrolyte leaking out of the battery (100) during the process of injecting the electrolyte into the battery can be minimized.

[0067] Meanwhile, the gap between the hopper coupling portion (21) and the battery sealing portion (22) may be configured to increase at least partially in the outward direction. In other words, the end portion (21a) of the hopper coupling portion (21) may be configured to be at least partially inclined upward. In addition, the outer upper surface of the battery sealing portion (22) may be configured to be at least partially inclined downward.

[0068] According to the above-described embodiment of the present invention, since the hopper coupling portion (21) is configured to be inclined upward as it goes outward, the end portion (21a) of the hopper coupling portion (21) can be more closely attached to the upper portion of the housing (120) as the hopper coupling portion (21) is pressed in the direction toward the battery (100). In addition, the force applied to the hopper coupling portion (21) by the hopper (10) can be more effectively transmitted to the battery sealing portion (22), so that the battery sealing portion (22) can better seal the open portion side of the battery (100).

[0069]

[0070] Referring to FIGS. 6 and 7, the battery sealing portion (22) may be configured such that its end (22a) moves outward and comes into close contact with the inner surface of the housing (120) as pressure is applied toward the battery (100). Here, the end (22a) of the battery sealing portion (22) may refer to a portion located on the outer side of the battery sealing portion (22).

[0071] According to the above-described embodiment of the present invention, the outer surface of the battery sealing portion (22) and the inner surface of the housing (120) can be configured to be in close contact. Accordingly, when electrolyte is injected into the battery (100), it is possible to effectively prevent the electrolyte from leaking out through the opening along the inner surface of the housing (120).

[0072] In addition, the end (22a) of the battery sealing portion (22) may be configured to be in close contact with the beading portion (121) as it is pressed in the direction toward the battery (100). According to the above-described embodiment of the present invention, the battery sealing portion (22) is configured to be in close contact with the beading portion (121), thereby securing a sealing force between the beading portion (121) and the battery sealing portion (22). As a result, it is possible to effectively prevent the electrolyte from leaking into the opening of the housing (120) along the beading portion (121) of the housing (120).

[0073] Meanwhile, referring to FIG. 7, the battery sealing portion (22) may be provided with a protrusion (22b). The protrusion (22b) may be formed on the outer surface of the battery sealing portion (22). The protrusion (22b) may be formed at a portion where the battery sealing portion (22) comes into contact with the housing (120). The protrusion (22b) may protrude toward the housing (120).

[0074] The protrusion (22b) may be formed to protrude outwardly along the radial direction of the housing (120). The protrusion (22b) may extend along the perimeter of the housing (120). A plurality of protrusions (22b) may be provided. The plurality of protrusions (22b) may be arranged to be spaced apart from each other along the height direction of the battery sealing portion (22). The plurality of protrusions (22b) may be arranged at equal intervals along the height direction of the battery sealing portion (22).

[0075] According to this configuration of the present invention, the protrusion (22b) can increase the contact area with the housing (120). In addition, the protrusion (22b) can increase the frictional force with the housing (120) by protruding toward the housing (120). Therefore, the protrusion (22b) can further strengthen the sealing force of the battery sealing portion (22) inserted into the housing (120), thereby effectively preventing electrolyte from leaking toward the opening of the housing (120).

[0076]

[0077] Fig. 8 is a cross-sectional view showing a connection structure between a sealing member and a battery according to another embodiment of the present invention, and Fig. 9 is an enlarged view of part B of Fig. 8.

[0078] According to another embodiment of the present invention, the battery sealing portion (22) of the present invention may be configured so that its end (22a) is deformed outwardly and adheres closely to the inner surface of the housing (120) as it is pressed in the direction toward the battery (100).

[0079] For example, as in the embodiments illustrated in FIGS. 8 and 9, the battery sealing portion (22) may be configured so that its inner diameter or inner width increases as it moves away from the hopper (10). The battery sealing portion (22) may be configured so that its thickness decreases as it moves away from the hopper (10).

[0080] When the inner diameter increasing structure of the battery sealing portion (22) and / or the thickness decreasing structure of the battery sealing portion (22) are applied, as the sealing member (20) is pressed toward the battery (100), the end of the battery sealing portion (22) can be flexibly deformed and can be closely attached to the inner surface of the housing (120) of the battery (100). Therefore, the risk of electrolyte leakage during the process of injecting electrolyte into the battery (100) can be eliminated or reduced.

[0081]

[0082] More specifically, referring to FIG. 9, the shape change of the sealing member (20) of the present invention as it is pressed in the direction toward the battery (100) will be described. The battery sealing member (22) may be configured so that, as it is pressed in the direction toward the battery (100), its end (22a) slides toward the outside of the battery (100) on the beading member (121) provided in the housing (120) of the battery (100). In addition, the battery sealing member (22) may be configured so that, as it is pressed in the direction toward the battery (100), its end (22a) comes into close contact with the inner surface of the housing (120) from above the beading member (121).

[0083] The inner surface of the beading portion (121) formed by pressing inwardly into the periphery of the housing (120) of the battery (100) may not be a completely flat surface, and other components may be positioned on the beading portion (121). Therefore, even if the end (22a) of the battery sealing portion (22) is pressed against the beading portion (121), there is a possibility that the sealing at the contact interface between the battery sealing portion (22) and the beading portion (121) may be incomplete. Therefore, as described above, when the end (22a) of the battery sealing portion (22) is configured to slide toward the outside of the battery (100) on the beading portion (121) and press against the inner surface of the housing (120) above the beading portion (121), the sealing performance can be further improved.

[0084] Meanwhile, such movement exhibited by the battery sealing portion (22) when the pellet (1) is pressed toward the battery (100) can be obtained, for example, by the inclined structure of the end (21a) of the hopper coupling portion (21) as described above and / or the inner diameter increasing structure of the battery sealing portion (22) and / or the thickness decreasing structure of the battery sealing portion (22).

[0085]

[0086] Fig. 10 is a drawing showing a connection structure between a sealing member and a battery equipped with a current collector according to one embodiment of the present invention, and Fig. 11 is an enlarged view of portion C of Fig. 10. In addition, Fig. 12 is a plan view of a battery equipped with a current collector plate.

[0087] Referring to FIGS. 10 to 12, the pellet (1) of the present invention can be applied to, for example, a battery (100) having a current collector (130). Referring to FIG. 12, the current collector (130) can be configured to be electrically connected to an electrode assembly (110). The current collector (130) can be combined with, for example, a non-conductive portion (111) provided on one surface of the electrode assembly (110). The current collector (130) can be positioned on a beading portion (121) of a housing (120).

[0088] Additionally, the current collector (130) may be provided with a current collector hole (130a). The current collector hole (130a) may be formed at approximately the center of the current collector (130). The current collector hole (130a) may be formed at a position corresponding to the winding center hole of the electrode assembly (110).

[0089] The battery sealing portion (22) may be configured so that its end (22a) is pressed against the upper surface of the current collector (130) as it is pressed in the direction toward the battery (100). This means that as the hopper coupling portion (21) is pressed against the upper portion of the housing (120), the end (22a) of the battery sealing portion (22) may also be configured so that it is pressed more against the upper surface of the current collector (130).

[0090] When the current collector (130) is placed on the beading portion (121) of the housing (120), unevenness may be formed on the upper surface of the beading portion (121) due to the current collector (130). In addition, when the current collector (130) is welded on the beading portion (121), the flatness of the upper surface of the beading portion (121) may be further reduced due to the welding bead.

[0091] Referring to Fig. 12, the current collector (130) may be discontinuously arranged on the beading portion (121), for example, along the circumferential direction of the housing (120). If the battery (100) has such a structure, the flatness on the beading portion (121) may be further reduced.

[0092] In a case where the flatness of the upper surface of the beading portion (121) is formed low like this, if the sealing of the connection portion between the pellet (1) and the battery (100) is attempted in such a way that the battery sealing portion (22) is in close contact with the beading portion (121), the sealing performance may be reduced, which may cause leakage of the electrolyte during the injection process.

[0093] Accordingly, the end (22a) of the battery sealing portion (22) according to one embodiment of the present invention can be configured to match the upper shape of the beading portion (121) due to the current collector (130) that exists discontinuously along the circumferential direction on the beading portion (121).

[0094] According to the above-described embodiment of the present invention, when the hopper coupling portion (21) is in close contact with the upper portion of the housing (120), and the end portion (22a) of the battery sealing portion (22) provides a pressing force toward the beading portion (121), the close contact between the end portion (22a) of the battery sealing portion (22) and the upper surface of the current collector (130) is strengthened, thereby ensuring a more improved sealing performance.

[0095]

[0096] Next, an electrolyte injection method according to one embodiment of the present invention will be described. In describing the electrolyte injection method of the present invention, reference will be made to FIGS. 1 to 12 of the present invention as a whole.

[0097] The electrolyte injection method of the present invention relates to a method of injecting an electrolyte into a battery (100) through an opening formed on one side of a housing (120) of the battery (100), and may include an insertion step, a mounting step, a sealing step, and an injection step.

[0098] The above insertion step may be a step of inserting an electrolyte injection pellet (1) into the opening of the housing (120). The above settling step may be a step of settling a sealing member (20) provided on the pellet (1) onto a beading part (121) provided on the housing (120). The sealing step may be a step of pressing a hopper coupling part (21) of the sealing member (20) toward the beading part (121) so that the hopper coupling part (21) is in close contact with the upper end of the housing (120). The above injection step may be a step of injecting an electrolyte into the interior of the housing (120) through the pellet (1).

[0099] The sealing step may include a sealing step. The sealing step may be a step in which, as the hopper coupling portion (21) is pressed toward the beading portion (121), the end portion (22a) of the battery sealing portion (22) of the sealing member (20) moves outward to seal against the inner surface of the housing (120).

[0100] The above-mentioned sealing step can be performed by sliding the end (22a) of the battery sealing portion (22) of the sealing member (20) toward the outside of the battery (100) on the beading portion (121), thereby causing the end (22a) of the battery sealing portion (22) to be in close contact with the inner surface of the housing (120).

[0101]

[0102] As described above, the present invention has been described with reference to the attached drawings, focusing on preferred embodiments. However, it will be apparent to those skilled in the art that numerous obvious modifications can be made without departing from the scope of the present invention. Accordingly, the scope of the present invention should be construed as encompassing such numerous modifications by the appended claims.

Claims

1. An electrolyte injection pellet configured to connect between an electrolyte supply device that supplies electrolyte and an opening formed on one side of a battery housing, A hopper having a hollow structure; and A pellet characterized by comprising a sealing member including a hopper coupling portion configured to be coupled to the hopper and spaced apart from the housing, and a battery sealing portion configured to seal the opening and to be spaced apart from the hopper coupling portion at least partially.

2. In paragraph 1, A pellet characterized in that the hopper coupling is configured to come closer to the housing as it is pressed in the direction toward the battery.

3. In paragraph 1, A pellet characterized in that the hopper coupling portion is configured such that its end is pressed against the upper end of the housing when pressed in the direction toward the battery.

4. In paragraph 1, A pellet characterized in that the gap between the hopper coupling portion and the battery sealing portion is configured to increase at least partially in the outward direction.

5. In paragraph 1, A pellet characterized in that the battery sealing portion is configured such that its end moves outward and adheres closely to the inner surface of the housing as pressure is applied in the direction of the battery.

6. In paragraph 1, A pellet characterized in that the battery sealing portion is configured such that the inner diameter or inner width increases as it moves away from the hopper.

7. In paragraph 1, A pellet characterized in that the battery sealing portion is configured such that its thickness decreases as it moves away from the hopper.

8. In paragraph 1, A pellet characterized in that the battery sealing portion is configured such that its end slides toward the outside of the battery on a beading portion provided in the housing of the battery when the battery sealing portion is pressed in the direction toward the battery.

9. In paragraph 8, A pellet characterized in that the battery sealing portion is configured such that its end is pressed against the inner surface of the housing from above the beading portion when pressed in the direction toward the battery.

10. In paragraph 1, A pellet characterized in that the battery sealing portion is configured so that its end is pressed against the upper surface of the current collector positioned on the beading portion when pressed in the direction toward the battery.

11. An electrolyte injection method for injecting electrolyte into a battery through an opening formed on one side of the battery housing, An insertion step of inserting a pellet for electrolyte injection into the above opening; A mounting step of mounting the sealing member provided in the above pellet on the beading portion provided in the housing; A sealing step of pressing the hopper joint of the sealing member toward the beading portion so that the hopper joint is in close contact with the upper portion of the housing; and An electrolyte injection method characterized by including an injection step of injecting an electrolyte into the interior of the housing through the pellets.

12. In paragraph 11, The above sealing step An electrolyte injection method characterized by including a sealing step in which an end of a battery sealing portion of the sealing member moves outward and comes into contact with an inner surface of the housing as the hopper coupling portion is pressed toward the beading portion.

13. In paragraph 12, An electrolyte injection method characterized in that the above-mentioned sealing step causes an end of the battery sealing portion of the sealing member to slide toward the outside of the battery on the beading portion, thereby causing an end of the battery sealing portion to be in contact with the inner surface of the housing.

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