Core column for electrolyte injection and electrolyte injection method

Abstract

The present invention relates to a stem for injecting an electrolyte solution, the stem being configured to be connected between an electrolyte solution supply device for supplying an electrolyte solution and an opening formed on one side of a case of a battery. Each of the core columns includes: 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

Technical Field

[0001] This disclosure relates to a pellet for electrolyte injection and a method for electrolyte injection.

[0002] This application is based on and claims priority to Korean Patent Application No. 10-2023-0193120, filed with the Korean Intellectual Property Office on December 27, 2023, the disclosure of which is incorporated herein by reference in its entirety.

[0003] This application is based on and claims priority to Korean Patent Application No. 10-2024-0004944, filed with the Korean Intellectual Property Office on January 11, 2024, the disclosure of which is incorporated herein by reference in its entirety. Background Technology

[0004] The electrolyte can be contained within the secondary battery along with the electrode assembly. To manufacture the secondary battery, one method can be to seal the casing constituting the secondary battery and then create holes to inject the electrolyte, or one method can be to inject the electrolyte before sealing the casing and then seal the casing.

[0005] In these methods, it is necessary to prevent electrolyte leakage to the outside of the secondary battery during the electrolyte injection process. To prevent electrolyte leakage, the connection between the secondary battery and the injection device needs to be well sealed.

[0006] For example, in the case of a cylindrical secondary battery, the electrode assembly can be inserted through an opening on one side of the casing, and then the electrolyte can be injected. The electrolyte can be injected by inserting one side of the core column, configured to connect between the secondary battery and the electrolyte supply device, into the opening of the secondary battery casing, and supplying the electrolyte using an electrolyte supply device connected to the other side of the core column.

[0007] In this case, the end of the core inserted into the opening of the housing can be tightly attached to the beading portion formed on the housing. The inner surface of the beading portion, formed by pressing the circumference of the housing inward, may not have a completely flat surface, or other components may be located on the beading portion. Therefore, even when the end of the core is tightly attached to the beading portion, the seal between the core and the secondary battery may not be complete.

[0008] The outer diameter or width of the end of the core can be approximately the same as the inner diameter or width of the casing, allowing the core to adhere tightly to the inner surface of the casing's sidewall to seal the connection. However, when the size of the core end is increased to enhance the seal, inserting the core into the secondary battery may become difficult, and when the size of the core end is decreased to facilitate insertion, the seal may weaken.

[0009] Therefore, there is a need to develop a core post for electrolyte injection with a structure that can solve the above problems. Summary of the Invention

[0010] Technical issues

[0011] This disclosure aims to address the problems of the prior art, and therefore aims to provide a core post that can facilitate the process of inserting a core post for electrolyte injection into a battery, and can also enhance the sealing at the connection between the core post and the battery.

[0012] However, the technical problems to be solved by this disclosure are not limited to those described above, and those skilled in the art can clearly understand other unmentioned problems from the following description of this disclosure.

[0013] Technical solution

[0014] In one aspect of this disclosure, a core for electrolyte injection is configured to connect between an electrolyte supply device for supplying electrolyte and an opening formed on one side of a battery casing, the core comprising: a hopper having a hollow structure; and a sealing member comprising a hopper connecting portion coupled to the hopper and spaced apart from the casing, and a battery sealing portion configured to seal the opening and at least partially spaced apart from the hopper connecting portion.

[0015] By pressing the hopper connection towards the battery, the hopper connection can be brought closer to the housing.

[0016] The hopper connection portion can be configured such that, as the hopper connection portion is pressed toward the battery, the end of the hopper connection portion is tightly attached to the upper end of the housing.

[0017] The gap between the hopper connecting part and the battery sealing part can be increased at least partially outward.

[0018] The battery sealing portion can be configured such that, as the battery sealing portion is pressed toward the battery, the end of the battery sealing portion moves outward and is tightly attached to the inner surface of the housing.

[0019] The inner diameter or width of the battery sealing part can be increased by moving it away from the hopper.

[0020] The thickness of the battery sealing section can be reduced by moving it away from the hopper.

[0021] The battery sealing portion can be configured such that, as the battery sealing portion is pressed toward the battery, the end of the battery sealing portion slides toward the outside of the battery on a pressing edge portion disposed in the battery housing.

[0022] The battery sealing portion can be configured such that, as the battery sealing portion is pressed toward the battery, the end of the battery sealing portion is tightly attached to the inner surface of the housing above the pressing edge portion.

[0023] The battery sealing portion can be formed such that as the battery sealing portion is pressed toward the battery, the end of the battery sealing portion is tightly attached to the top surface of the current collector located on the pressing edge portion.

[0024] In another aspect of this disclosure, an electrolyte injection method for injecting electrolyte into a battery through an opening formed on one side of the battery casing includes: an insertion step of inserting a core for electrolyte injection into the opening; a placement step of placing a sealing member disposed in the core onto a pressing edge portion disposed in the casing; a sealing step of pressing a hopper connecting portion of the sealing member against the pressing edge portion to tightly attach the hopper connecting portion to the upper end of the casing; and an injection step of injecting electrolyte into the casing through the core.

[0025] The sealing step may include a tight contact step, in which, as the hopper connection portion is pressed toward the pressing edge portion, the end of the battery sealing portion of the sealing member moves outward and is tightly attached to the inner surface of the housing.

[0026] The tight contact step may include allowing the end of the battery sealing portion of the sealing member to slide on the pressure edge portion toward the outside of the battery, such that the end of the battery sealing portion is tightly attached to the inner surface of the housing.

[0027] Beneficial effects

[0028] According to one aspect of this disclosure, since the upper end of the battery is sealed by using the load of the core column during the insertion of the core column for electrolyte injection into the battery, the seal at the connection between the core column and the battery can be more easily enhanced.

[0029] Furthermore, according to another aspect of this disclosure, because the outer surface of the battery sealing portion and the inner surface adjacent to the end of the battery casing are tightly attached, leakage of electrolyte flowing along the pressing edge portion of the battery casing toward the opening portion of the battery casing can be effectively prevented.

[0030] Furthermore, according to another aspect of this disclosure, because the battery sealing portion double-seales the upper end and inner surface of the battery casing, leakage of the electrolyte can be effectively prevented during the injection of the electrolyte into the battery.

[0031] This disclosure may have various other effects, which will be described in each embodiment, or descriptions of effects that can be readily deduced by those skilled in the art will be omitted. Attached Figure Description

[0032] The accompanying drawings illustrate preferred embodiments of the present disclosure and, together with the foregoing disclosure, serve to provide a further understanding of the technical features of the present disclosure; therefore, the present disclosure is not to be construed as limited to the drawings.

[0033] Figure 1 This is a diagram illustrating the state before the core is connected to the battery according to an embodiment of the present disclosure.

[0034] Figure 2 This is a diagram illustrating the state in which the core is connected to the battery according to an embodiment of the present disclosure.

[0035] Figure 3 This is a perspective view illustrating a sealing member according to an embodiment of the present disclosure.

[0036] Figure 4 This is a cross-sectional view illustrating a sealing member according to an embodiment of the present disclosure.

[0037] Figure 5 This is a cross-sectional view illustrating the connection structure between the sealing member and the battery according to an embodiment of the present disclosure.

[0038] Figure 6 This is a cross-sectional view illustrating the state of the battery-facing pressing sealing member according to an embodiment of the present disclosure.

[0039] Figure 7 This is an example Figure 6 An enlarged view of part A.

[0040] Figure 8 This is a cross-sectional view illustrating the connection structure between the sealing member and the battery according to another embodiment of the present disclosure.

[0041] Figure 9 This is an example Figure 8 An enlarged view of part B.

[0042] Figure 10 This is a diagram illustrating the connection structure between a sealing member and a battery including a current collector, according to an embodiment of the present disclosure.

[0043] Figure 11 This is an example Figure 10 An enlarged view of part C.

[0044] Figure 12 This is a plan view illustrating a battery including a current collector. Detailed Implementation

[0045] The preferred embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. Before the description, it should be understood that the terminology used in the specification and appended claims should not be construed as limited to its general or dictionary meaning, but rather is interpreted based on the principle of allowing the inventors to appropriately define the terminology for the best interpretation, and on the meaning and concepts corresponding to the technical aspects of this disclosure.

[0046] Therefore, the descriptions presented herein are merely preferred examples for illustrative purposes and are not intended to limit the scope of this disclosure. It should be understood that other equivalents and modifications may be made thereto without departing from the scope of this disclosure.

[0047] Furthermore, this disclosure includes various embodiments. Repeated descriptions of components that are substantially the same as or similar to those described above will be omitted; the differences will be primarily described.

[0048] For ease of explanation and clarity, the dimensions of each element or specific portion of an element shown in the accompanying drawings may be enlarged, omitted, or shown schematically. Therefore, the dimensions of each element may not substantially reflect its actual size. In describing this disclosure, detailed descriptions of relevant well-known functions or configurations that may obscure the essential points of this disclosure have been omitted. For reference, in the specification, terms indicating direction are based on the elements shown in the accompanying drawings and are relative terms that may vary depending on the actual orientation or position of the elements.

[0049] Those skilled in the art will understand that when terms such as up, down, left, right, front, and back are used to indicate directions, these terms are for ease of interpretation only and can vary depending on the position of the target object, the position of the observer, etc.

[0050] Reference Figures 1 to 4 The core post 1 according to an embodiment of the present disclosure will be described.

[0051] Figure 1 This is a diagram illustrating the state before the core is connected to the battery according to an embodiment of the present disclosure. Figure 2 This diagram illustrates the state in which the core post is connected to the battery according to an embodiment of this disclosure. Additionally, Figure 3 This is a perspective view illustrating a sealing member according to an embodiment of the present disclosure. Figure 4 This is a cross-sectional view illustrating a sealing member according to an embodiment of the present disclosure.

[0052] Reference Figures 1 to 4 According to embodiments of the present disclosure, the core post 1 may be a core post for electrolyte injection configured to be connected to an electrolyte supply device for supplying electrolyte to the battery 100.

[0053] In this disclosure, the electrolyte-injected battery 100 may include an electrode assembly 110 and a housing 120. The battery 100 may be a rechargeable and dischargeable secondary battery. The battery 100 may, for example, be a cylindrical battery.

[0054] The electrode assembly 110 can be formed by winding a stack including a first electrode, a second electrode, and a diaphragm. Furthermore, the housing 120 may include an opening to receive 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.

[0055] According to embodiments of the present disclosure, the core post 1 may be a core post for electrolyte injection, which is configured to connect between an electrolyte supply device for supplying electrolyte and an opening formed on one side of the housing 120 of the battery 100.

[0056] The core 1 may include a hopper 10 and a sealing member 20. The hopper 10 may have a hollow structure through which electrolyte supplied by the electrolyte supply device can pass. That is, the hopper 10 can be used as a connector to connect the electrolyte supply device to the battery 100 during electrolyte injection. The hopper 10 may include a metallic material to ensure rigidity. However, the material of the hopper 10 is not limited to this; any material that maintains appropriate rigidity and is chemically resistant to the electrolyte passing through the hopper 10 can be used for the hopper 10.

[0057] The sealing member 20 can be coupled to the hopper 10 and configured to seal the battery 100 during electrolyte injection. The sealing member 20 can be configured to seal the opening portion of the battery 100.

[0058] The sealing member 20 may include a flexible material to prevent electrolyte leakage at the connection between the hopper 10 and the sealing member 20, and at the contact portion between 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, the internal space of which may communicate with the inner surface of the hopper 10. The sealing member 20 may have a generally cylindrical shape with a hollow center.

[0059] More specifically, the sealing member 20 may include a hopper connecting portion 21 and a battery sealing portion 22. The hopper connecting portion 21 may also be connected to the hopper 10. The hopper connecting portion 21 may have a shape corresponding to one end of the hopper 10. The hopper connecting portion 21 may surround the outer surface of one end of the hopper 10. Alternatively, the hopper connecting portion 21 may be pressed towards the battery 100 via the hopper 10. (See reference...) Figure 2 The hopper 10 can contact the upper end of the hopper connecting part 21.

[0060] Furthermore, the hopper connection portion 21 can be spaced apart from the housing 120. For details, refer to... Figure 2 The lower end of the hopper connecting portion 21 can be spaced upward from the opening of the housing 120. The outer perimeter of the hopper connecting portion 21 can be larger than the outer perimeter of the housing 120. The hopper connecting portion 21 can contact the upper end of the housing 120 during electrolyte injection.

[0061] The battery sealing portion 22 can also be configured to seal the opening of the housing 120. The battery sealing portion 22 can have a shape corresponding to one end of the housing 120. The battery sealing portion 22 can be at least partially spaced from the hopper connection portion 21. That is, a groove can also be formed along the outer periphery of the outer surface of the sealing member 20. The battery sealing portion 22 can be tightly attached to the inner surface of the housing 120 of the battery 100 during electrolyte injection.

[0062] According to embodiments of this disclosure, when electrolyte is injected into the battery 100, the sealing member 20 can simultaneously double-seal the upper end and inner surface of the housing 120. Therefore, the sealing performance at the connection between the core 1 and the battery 100 can be improved. Thus, according to embodiments of this disclosure, the risk of electrolyte leakage to the outside of the battery 100 during the process of injecting electrolyte into the battery can be minimized.

[0063] Furthermore, when the core 1 is not in operation, the sealing member 20 may harden. According to the embodiments of this disclosure, because the hopper connection portion 21 seals the housing 120 by pressing the upper end of the housing 120, the sealing performance of the battery 100 can be ensured even when the sealing member 20 hardens. Therefore, the efficiency of the electrolyte injection process can be improved.

[0064] Next, refer to Figures 5 to 7 A more detailed explanation will be given of the shape change when the sealing member 20 disclosed herein is pressed toward the battery 100.

[0065] Figure 5 This is a cross-sectional view illustrating the connection structure between the sealing member and the battery according to an embodiment of the present disclosure. Furthermore, Figure 6 This is a cross-sectional view illustrating the state in which the sealing member according to an embodiment of the present disclosure is pressed toward the battery. Figure 7 This is an example Figure 6 An enlarged view of part A.

[0066] As the hopper connecting portion 21 is pressed toward the battery 100, the hopper connecting portion 21 can be brought closer to the housing 120. Furthermore, as the hopper connecting portion 21 is pressed toward the battery 100, the end portion 21a of the hopper connecting portion 21 can be tightly attached to the upper end of the housing 120. In this case, the end portion 21a of the hopper connecting portion 21 can refer to the portion facing the housing 120. Alternatively, the end portion 21a of the hopper connecting portion 21 can also refer to the lower outer end of the hopper connecting portion 21. Alternatively, the end portion 21a of the hopper connecting portion 21 can refer to the lower outer surface of the hopper connecting portion 21.

[0067] According to embodiments of this disclosure, the hopper connecting portion 21 can press against the upper end of the housing 120 to seal the housing 120. Therefore, the sealing at the connection between the core 1 and the battery 100 can be improved. Thus, according to embodiments of this disclosure, the risk of electrolyte leakage to the outside of the battery 100 during the injection of electrolyte into the battery can be minimized.

[0068] The separation gap between the hopper connecting portion 21 and the battery sealing portion 22 can be increased at least partially outward. In other words, the end 21a of the hopper connecting portion 21 can be at least partially inclined upward. In addition, the outer upper surface of the battery sealing portion 22 can also be at least partially inclined downward.

[0069] According to the embodiments of this disclosure, because the hopper connecting portion 21 is inclined upwards towards the outside, as the hopper connecting portion 21 is pressed towards the battery 100, the end 21a of the hopper connecting portion 21 can be more tightly attached to the upper end of the housing 120. In addition, since the pressing force applied by the hopper 10 to the hopper connecting portion 21 is easily transmitted to the battery sealing portion 22, the battery sealing portion 22 can better seal the opening of the battery 100.

[0070] refer to Figure 6 and Figure 7 As the battery sealing portion 22 is pressed toward the battery 100, the end 22a of the battery sealing portion 22 can move outward and can be tightly attached to the inner surface of the housing 120. The end 22a of the battery sealing portion 22 may refer to the portion located on the outer side of the battery sealing portion 22.

[0071] According to embodiments of this disclosure, the outer surface of the battery sealing portion 22 can be tightly attached to the inner surface of the housing 120. Therefore, when electrolyte is injected into the battery 100, leakage of electrolyte along the inner surface of the housing 120 can be effectively prevented.

[0072] Furthermore, as the battery sealing portion 22 is pressed toward the battery 100, the end 22a of the battery sealing portion 22 can be tightly attached to the pressing edge portion 121. According to the embodiment of this disclosure, because the battery sealing portion 22 is tightly attached to the pressing edge portion 121, the sealing force between the pressing edge portion 121 and the battery sealing portion 22 can be ensured. Therefore, electrolyte leakage along the pressing edge portion 121 of the housing 120 to the opening of the housing 120 can be effectively prevented.

[0073] Reference Figure 7 The battery sealing portion 22 may include 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 on the portion of the battery sealing portion 22 that contacts the housing 120. The protrusion 22b may protrude toward the housing 120.

[0074] The protrusion 22b may protrude outward along the radial direction of the housing 120. The protrusion 22b may extend along the circumference of the housing 120. Multiple protrusions 22b may be provided. Multiple protrusions 22b may be spaced apart from each other along the height direction of the battery sealing portion 22. Multiple protrusions 22b may also be provided at equal intervals along the height direction of the battery sealing portion 22.

[0075] According to the structure disclosed herein, the protrusion 22b can increase the contact area with the housing 120. Furthermore, since the protrusion 22b protrudes towards the housing 120, the frictional force with the housing 120 can be increased. Therefore, since the protrusion 22b can further enhance the sealing force of the battery sealing portion 22 inserted into the housing 120, leakage of electrolyte towards the opening of the housing 120 can be effectively prevented.

[0076] Figure 8 This is a cross-sectional view illustrating the connection structure between the sealing member and the battery according to another embodiment of the present disclosure. Figure 9 This is an example Figure 8 An enlarged view of part B.

[0077] According to another embodiment of this disclosure, as the battery sealing portion 22 is pressed toward the battery 100, the end 22a of the battery sealing portion 22 can deform outward and can be tightly attached to the inner surface of the housing 120.

[0078] For example, such as Figure 8 and Figure 9 As shown in the embodiment, the inner diameter or internal width of the battery sealing portion 22 can be increased by moving away from the hopper 10. The thickness of the battery sealing portion 22 can be decreased by moving away from the hopper 10.

[0079] When an increased inner diameter structure and / or a reduced thickness structure of the battery sealing portion 22 are applied, the end of the battery sealing portion 22 can flexibly deform as the sealing member 20 is pressed toward the battery 100, and can be well and tightly attached to the inner surface of the housing 120 of the battery 100. Therefore, the risk of electrolyte leakage during the injection of electrolyte into the battery 100 can be eliminated or reduced.

[0080] For more details, please refer to Figure 9 The shape of the sealing member 20 changes as it is pressed toward the battery 100. As the battery sealing portion 22 is pressed toward the battery 100, its end 22a can slide toward the outside of the battery 100 on the pressing edge portion 121 provided in the housing 120 of the battery 100. Furthermore, as the battery sealing portion 22 is pressed toward the battery 100, its end 22a can be tightly attached to the inner surface of the housing 120 above the pressing edge portion 121.

[0081] The inner surface of the pressing edge portion 121, formed by pressing the circumference of the battery casing 120 inward, may not be a completely flat surface, and other components may be located on the pressing edge portion 121. Therefore, even when the end 22a of the battery sealing portion 22 is tightly attached to the pressing edge portion 121, the seal at the contact interface between the battery sealing portion 22 and the pressing edge portion 121 may not be complete. Therefore, as described above, when the end 22a of the battery sealing portion 22 slides outward from the pressing edge portion 121 and is tightly attached to the inner surface 120 above the pressing edge portion 121, the sealing performance can be further improved.

[0082] When the core post 1 is pressed toward the battery 100, this movement of the battery sealing portion 22 can be achieved, for example, by the inclined structure of the end 21a of the hopper connecting 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.

[0083] Figure 10 This is a diagram illustrating the connection structure between a sealing member and a battery including a current collector according to an embodiment of the present disclosure. Figure 11 This is an example Figure 10 An enlarged view of part C. Additionally, Figure 12 This is a plan view illustrating a battery including a current collector.

[0084] Reference Figures 10 to 12 The core post 1 disclosed herein can be applied to a battery 100, including, for example, a current collector 130. (See reference...) Figure 12The current collector 130 can be electrically connected to the electrode assembly 110. The current collector 130 can be coupled to an uncoated portion 111 disposed on a surface of the electrode assembly 110. The current collector 130 can be located on the pressing portion 121 of the housing 120.

[0085] Additionally, the current collector 130 may have 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.

[0086] As the battery sealing portion 22 is pressed toward the battery 100, the end 22a of the battery sealing portion 22 can be tightly attached to the top surface of the current collector 130. As the hopper connecting portion 21 is tightly attached to the upper end of the housing 120, the end 22a of the battery sealing portion 22 can also be more tightly attached to the top surface of the current collector 130.

[0087] When the current collector 130 is disposed on the pressure plate portion 121 of the housing 120, an uneven structure can be formed on the top surface of the pressure plate portion 121 due to the current collector 130. Furthermore, when the current collector 130 is welded to the pressure plate portion 121, the flatness of the top surface of the pressure plate portion 121 may be further reduced due to the weld bead.

[0088] Reference Figure 12 For example, the current collector 130 may be discontinuously disposed on the pressing portion 121 along the circumference of the housing 120. When the battery 100 has such a structure, the flatness on the pressing portion 121 can be further reduced.

[0089] Therefore, when the flatness of the top surface of the pressing portion 121 is low, if the seal at the connection between the core post 1 and the battery 100 is achieved by tightly attaching the battery sealing portion 22 to the pressing portion 121, the seal may deteriorate during the injection process and electrolyte leakage may occur.

[0090] Therefore, the end 22a of the battery sealing portion 22 according to the embodiment of the present disclosure can be formed to match the upper shape of the pressing portion 121, since the current collector 130 is discontinuously disposed on the pressing portion 121 along the circumferential direction.

[0091] According to an embodiment of the present disclosure, when the end 22a of the battery sealing portion 22 is pressed toward the pressing edge portion 121 at the upper end of the housing 120 in close attachment of the hopper connection portion 21, the adhesion between the end 22a of the battery sealing portion 22 and the top surface of the current collector 130 can be increased, thereby ensuring better sealing.

[0092] Next, an electrolyte injection method according to embodiments of the present disclosure will be described. Referring to the present disclosure... Figures 1 to 12 The electrolyte injection method of this disclosure is described.

[0093] The electrolyte injection method disclosed herein relates to a method of injecting electrolyte into the battery 100 through an opening formed on one side of the housing 120 of the battery 100, and may include an insertion step, a placement step, a sealing step, and an injection step.

[0094] The insertion step can be the step of inserting the core column 1 for electrolyte injection into the opening of the housing 120. The placement step can be the step of placing the sealing member 20 disposed in the core column 1 onto the pressing edge portion 121 disposed in the housing 120. The sealing step can be the step of pressing the hopper connecting portion 21 of the sealing member 20 toward the pressing edge portion 121 to tightly attach the hopper connecting portion 21 to the upper end of the housing 120. The injection step can be the step of injecting electrolyte into the housing 120 through the core column 1.

[0095] The sealing process may include a tight contact process. The tight contact process may be a process in which the end 22a of the battery sealing portion 22 of the sealing member 20 moves outward and is tightly attached to the inner surface of the housing 120 as the hopper connecting portion 21 is pressed toward the pressing portion 121.

[0096] During the close contact step, the end 22a of the battery sealing portion 22 of the sealing member 20 can slide on the pressing portion 121 toward the outside of the battery 100, so that the end 22a of the battery sealing portion 22 is tightly attached to the inner surface of the housing 120.

[0097] While this disclosure has been specifically shown and described with reference to exemplary embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made therein without departing from the scope of this disclosure. Therefore, the scope of this disclosure is defined by the following claims, which are described to include examples of many such variations.

Claims

1. A core post for electrolyte injection, the core post being configured to connect between an electrolyte supply device for supplying electrolyte and an opening formed on one side of a battery casing, the core post comprising: The hopper has a hollow structure; and A sealing member comprising a hopper connection portion and a battery sealing portion, the hopper connection portion being connected to the hopper and spaced apart from the housing, the battery sealing portion being configured to seal the opening portion and being at least partially spaced apart from the hopper connection portion.

2. The core post according to claim 1, wherein, As the hopper connection portion is pressed toward the battery, the hopper connection portion moves closer to the housing.

3. The core post according to claim 1, wherein, The hopper connection portion is configured such that, as the hopper connection portion is pressed toward the battery, the end of the hopper connection portion is tightly attached to the upper end of the housing.

4. The core post according to claim 1, wherein, The separation gap between the hopper connecting part and the battery sealing part increases at least partially outward.

5. The core post according to claim 1, wherein, The battery sealing portion is formed such that as the battery sealing portion is pressed toward the battery, the end of the battery sealing portion moves outward and is tightly attached to the inner surface of the housing.

6. The core post according to claim 1, wherein, The inner diameter or internal width of the battery sealing portion increases away from the hopper.

7. The core post according to claim 1, wherein, The thickness of the battery sealing portion decreases as it moves away from the hopper.

8. The core post according to claim 1, wherein, The battery sealing portion is formed such that, as the battery sealing portion is pressed toward the battery, the end of the battery sealing portion slides toward the outside of the battery on a pressing edge portion disposed in the housing of the battery.

9. The core post according to claim 8, wherein, The battery sealing portion is formed such that, as the battery sealing portion is pressed toward the battery, the end of the battery sealing portion is tightly attached to the inner surface of the housing above the pressing edge portion.

10. The core post according to claim 1, wherein, The battery sealing portion is formed such that, as the battery sealing portion is pressed toward the battery, the end of the battery sealing portion is tightly attached to the top surface of the current collector located on the pressing edge portion.

11. An electrolyte injection method, wherein the electrolyte injection method injects the electrolyte into the battery through an opening formed on one side of the battery casing, the electrolyte injection method comprising: The insertion step involves inserting the core for electrolyte injection into the opening portion; The placement step involves placing the sealing member disposed in the core post onto the pressure edge portion disposed in the housing; In the sealing step, the hopper connecting portion of the sealing member is pressed toward the pressing edge portion to tightly attach the hopper connecting portion to the upper end of the housing; and In the injection step, electrolyte is injected into the housing through the core column.

12. The electrolyte injection method according to claim 11, wherein, The sealing step includes a tight contact step, in which, as the hopper connection portion is pressed toward the pressing edge portion, the end of the battery sealing portion of the sealing member moves outward and is tightly attached to the inner surface of the housing.

13. The electrolyte injection method according to claim 12, wherein, The tight contact step includes: allowing the end of the battery sealing portion of the sealing member to slide on the pressure edge portion toward the outside of the battery, such that the end of the battery sealing portion is tightly attached to the inner surface of the housing.

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