Hopper and electrolyte injection tray comprising the same

Abstract

A hopper includes: a hopper body portion, the hopper body portion including an electrolyte inlet formed at one end, an electrolyte injection port formed at the other end, and a cavity connecting the electrolyte inlet and the electrolyte injection port; and a buffer portion formed at the center of the electrolyte injection port of the hopper body portion.

Description

Technical Field

[0001] This disclosure relates to a hopper and an electrolyte injection tray including the hopper. Background Technology

[0002] Secondary batteries, which are highly adaptable based on product category and electrical characteristics such as high energy density, are widely used not only in portable devices but also in electric vehicles (EVs) or hybrid electric vehicles (HEVs) powered by electric power sources.

[0003] The main advantages of this type of secondary battery are that it can greatly reduce the use of fossil fuels and does not produce any byproducts from the use of energy, thus making it stand out as a new energy source for improving environmental friendliness and energy efficiency.

[0004] Meanwhile, the electrolyte can be contained within the secondary battery along with the electrode assembly. During the manufacture of the secondary battery, after the casing constituting the secondary battery is sealed, a hole for injecting the electrolyte can be formed again, or the electrolyte can be injected before sealing the casing, and then the casing can be sealed.

[0005] In any of these methods, it is necessary to prevent electrolyte leakage from the secondary battery during the electrolyte injection process. To prevent electrolyte 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, electrolyte injection can be performed after the electrode assembly is inserted through an opening on one side of the housing. Electrolyte injection can be performed by inserting a device configured to connect an electrolyte supply device to one side of the secondary battery tray into the opening of the secondary battery housing, and supplying electrolyte using an electrolyte supply device connected to the other side of the tray.

[0007] However, a problem exists where the separator of the electrode assembly within the secondary battery may loosen or collapse due to the potential energy generated by the falling electrolyte during the electrolyte injection process. In particular, during the electrolyte injection process, high voltage is applied to the core of the electrode assembly, leading to defects in the secondary battery. Summary of the Invention

[0008] Technical issues

[0009] Therefore, this disclosure provides a hopper capable of preventing damage to electrode assemblies housed within a battery casing during an electrolyte injection process, and an electrolyte injection tray including the hopper.

[0010] However, the technical problems to be solved by this disclosure are not limited to those described above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description of this disclosure.

[0011] Technical solution

[0012] According to one aspect of the present invention, a hopper includes: a hopper body portion having an electrolyte inlet formed at one end and an electrolyte injection port formed at the other end, and having a cavity connecting the electrolyte inlet and the electrolyte injection port; and a buffer portion formed at the center of the electrolyte injection port of the hopper body portion.

[0013] The hopper body portion formed on the other side of the electrolyte injection port may include a section where the inner diameter gradually decreases toward the electrolyte injection port.

[0014] One side of the buffer portion may include a shape in which the cross-sectional area gradually decreases toward the electrolyte inlet of the hopper body portion.

[0015] The length of one side of the buffer section can be one-third longer than the length of the cavity of the hopper body section.

[0016] The other side of the buffer section can protrude to the outside of the electrolyte injection port of the hopper body section.

[0017] The other side of the buffer portion may include a shape in which the cross-sectional area gradually decreases as the other side protrudes from the electrolyte inlet of the hopper body portion.

[0018] According to one aspect of this disclosure, an electrolyte injection tray is provided, the electrolyte injection tray being configured to connect between an electrolyte supply device for supplying electrolyte to the interior of a battery cell and an opening formed on one side of a battery casing. The electrolyte injection tray includes a hopper and a sealing member. The hopper includes a hopper body portion and a buffer portion. The hopper body portion has an electrolyte inlet, a cavity, and an electrolyte injection port. The electrolyte inlet is formed at one end facing the electrolyte supply device, while the electrolyte injection port is formed at the other end facing the opening of the battery casing. The cavity connects the electrolyte inlet and the electrolyte injection port. The buffer portion is formed at the center of the electrolyte injection port in the hopper body portion. The sealing member is coupled to the electrolyte injection port of the hopper. When electrolyte is injected, the sealing member is tightly fitted against the opening of the battery casing.

[0019] The hopper body portion formed on the other side of the electrolyte injection port may include a range in which the inner diameter gradually decreases toward the electrolyte injection port.

[0020] One side of the buffer portion may include a shape in which the cross-sectional area gradually decreases toward the electrolyte inlet of the hopper body portion.

[0021] The length of one side of the buffer section can be one-third longer than the length of the cavity of the hopper body section.

[0022] The other side of the buffer portion can protrude to the outside of the electrolyte injection port of the hopper body portion and can be positioned within the sealing member.

[0023] The other side of the buffer portion may include a shape in which the cross-sectional area gradually decreases as the other side protrudes from the electrolyte inlet of the hopper body portion.

[0024] The electrolyte injection tray may also include an O-ring connected to the electrolyte inlet of the hopper, and when electrolyte is injected, the O-ring fits tightly against the supply nozzle of the electrolyte supply device.

[0025] Beneficial effects

[0026] According to this disclosure, damage to the electrode assembly housed within the battery casing can be stably prevented during the electrolyte injection process.

[0027] However, the effects that can be obtained through this disclosure are not limited to those described above, and other technical effects not mentioned will be clearly understood by those skilled in the art from the following description of this disclosure. Attached Figure Description

[0028] Figure 1 This is a cross-sectional view of a hopper according to one aspect of the present disclosure.

[0029] Figure 2 It shows including Figure 1 A cross-sectional view of the electrolyte being injected into the tray from the hopper.

[0030] Figure 3 It shows the use Figure 2 A diagram showing the process of injecting electrolyte into the electrolyte injection tray.

[0031] Figure 4 It shows through Figure 2 The diagram shows the electrolyte injected into the electrolyte injection tray.

[0032] Figure 5 This is a diagram showing the state of electrolyte injection using the electrolyte injection tray according to the comparative example.

[0033] Figure 6 It is a comparison based on Figure 4 Experimental examples and Figure 5 A graph showing the change in shear stress during the electrolyte injection process in the comparative example. Detailed Implementation

[0034] The advantages and features of this disclosure, as well as the methods for implementing them, will become apparent from the following detailed description in conjunction with the accompanying drawings. However, the invention is not limited to the aspects disclosed below, but may be embodied in various different forms, and these aspects are provided only to make the disclosure complete and to fully inform those skilled in the art of its scope, which is defined only by the scope of the claims. Therefore, in some aspects, well-known process steps, well-known apparatus structures, and well-known techniques have not been specifically described in order to avoid ambiguity in interpreting the invention. Throughout the specification, the same reference numerals denote the same elements.

[0035] In the accompanying drawings, the thickness of layers, films, plates, regions, etc., is exaggerated for clarity. Therefore, the various figures are not drawn to scale. Throughout the specification, the same reference numerals denote the same elements. It should be understood that when an element (e.g., a layer, film, region, or substrate) is referred to as being "on" another element, it may be directly on the other element, or there may be intermediate elements present. Conversely, when an element is referred to as being "directly on" another element, there are no intermediate elements. Furthermore, it should be understood that when an element (e.g., a layer, film, region, or substrate) is referred to as being "below" another element, it may be directly below the other element, or there may be intermediate elements present. Conversely, when an element is referred to as being "directly below" another element, there are no intermediate elements.

[0036] Throughout this specification, unless otherwise specified, each element may be singular or plural.

[0037] In the following text, reference will be made to Figures 1 to 3 The present disclosure describes a hopper 501 and an electrolyte injection tray 101 including the hopper.

[0038] According to one aspect of this disclosure, a hopper 501 and an electrolyte injection tray 101 including the hopper are configured to connect an electrolyte supply device 900 and an opening portion, wherein the electrolyte supply device 900 supplies electrolyte into the interior of a battery cell 100, and the opening portion is formed on one side of a battery housing 50 and is used to seal the connection between the electrolyte supply device 900 and the battery cell 100 to prevent electrolyte leakage, thereby preventing electrolyte leakage from the battery cell 100 during the electrolyte injection process.

[0039] Figure 1 This is a diagram showing a hopper 501 according to one aspect of this disclosure. Figure 2 This is a diagram showing an electrolyte injection tray 101 including a hopper 501, and Figure 3 This is a diagram illustrating the process of injecting electrolyte using electrolyte injection tray 101.

[0040] Reference Figure 1 Hopper 501 is used to feed electrolyte from electrolyte supply device 900 ( Figure 3 The electrolyte supplied (as shown) is guided into the interior of the battery casing 50. Specifically, the hopper 501 includes a hopper body portion 510 and a buffer portion 530.

[0041] An electrolyte inlet 511 is formed on one side of the hopper body portion 510, and an electrolyte injection port 512 is formed on the other side, and a cavity is provided connecting the electrolyte inlet 511 and the electrolyte injection port 512.

[0042] In this case, the other side of the hopper body portion 510 where the electrolyte inlet 512 is formed may include a range in which the inner diameter gradually decreases toward the electrolyte inlet 512.

[0043] That is, the inner diameter of the electrolyte injection port 512 is formed to be smaller than the inner diameter of the electrolyte inlet 511, and at this time, the inner diameter of the other side forming the electrolyte injection port 512 can gradually decrease toward the electrolyte injection port 512.

[0044] Therefore, when the electrolyte flowing into the electrolyte inlet 511 impacts the inclined surface formed on the other side of the hopper body portion 510 in the cavity, the impact force is buffered.

[0045] The buffer section 530 also counteracts the potential energy of the electrolyte in the electrolyte inlet 511 that flows into the hopper body section 510.

[0046] Specifically, one side 531 of the buffer portion 530 may include a shape in which the cross-sectional area gradually decreases in the direction toward the electrolyte inlet 511 of the hopper body portion 510. Furthermore, the length of one side 531 of the buffer portion 530 may be formed to be approximately one-third longer than the length of the cavity of the hopper body portion 510. In other words, the distance from the electrolyte inlet 511 of the hopper body portion 510 to one side 531 of the buffer portion 530 may be formed to be less than two-thirds of the distance from the electrolyte inlet 511 of the hopper body portion 510 to the electrolyte injection port 512.

[0047] Therefore, the electrolyte flowing into the electrolyte inlet 511 of the hopper body portion 510 impacts the inclined surface formed on one side 5310 of the buffer portion 530, and then flows downward along the inclined surface, thereby offsetting the potential energy.

[0048] Furthermore, according to one aspect of this disclosure, since one side 531 of the buffer portion 530 has sufficient length, the distance from the electrolyte inlet 511 of the hopper body portion 510 to one side 531 of the buffer portion 530 is shortened, thereby reducing the phenomenon of electrolyte flowing into the electrolyte inlet 511 of the hopper body portion 510 falling and impacting the buffer portion 530 and splashing. If the length of one side 531 of the buffer portion 530 is formed to be less than about 1 / 3 of the length of the cavity of the hopper body portion 510, the distance from the electrolyte inlet 511 of the hopper body portion 510 to one side 531 of the buffer portion 530 may become longer. Therefore, when the electrolyte falls due to the potential energy of the electrolyte flowing into the electrolyte inlet 511 and collides with the buffer portion 530, a large amount of splashing may occur, and due to this splashing of the electrolyte, bubbles may be generated, and after the electrolyte is injected into the battery cell 100 (e.g. Figure 3 As shown in the figure, cavitation may form.

[0049] Additionally, the other side 532 of the buffer portion 530 can protrude from the electrolyte inlet 512 of the hopper body portion 510. Furthermore, the other side of the buffer portion 530 may include a shape in which the cross-sectional area gradually decreases as the buffer portion 530 protrudes from the electrolyte inlet 512 of the hopper body portion 510. Therefore, the flowability of the electrolyte injected into the battery housing 50 can be improved, allowing the electrolyte to flow naturally into the interior of the battery housing 50.

[0050] Reference Figure 2 The electrolyte injection tray 101 includes a hopper 501 and a sealing member 400. Additionally, the electrolyte injection tray 101 may also include an O-ring 300. Here, the hopper 501 is the same as described above. Figure 1 The hoppers described are identical.

[0051] The hopper 501 used in the electrolyte injection tray 101 is mounted such that the electrolyte inlet 511 faces the electrolyte supply device 900 and the electrolyte injection port 512 faces the opening of the battery housing 50.

[0052] The sealing member 400 is connected to the electrolyte inlet 512 of the hopper 501 and comes into close contact with the opening of the battery housing 50 when the electrolyte is injected. At this time, the other side of the buffer portion 530 of the hopper 501 can protrude to the outside of the electrolyte inlet 512 of the hopper body portion 510 and can be positioned inside the sealing member 400.

[0053] The O-ring 300 can be connected to the electrolyte inlet 511 of the hopper 501, and when the electrolyte is injected, the O-ring 300 can be in close contact with the supply nozzle of the electrolyte supply device 900.

[0054] In this way, by connecting the sealing member 400 and the O-ring 300 to the two ends of the hopper 501, electrolyte leakage during the electrolyte injection process can be reliably prevented.

[0055] Reference Figure 3 The process of injecting electrolyte using a hopper 501 and an electrolyte injection tray 101 including the hopper is described according to one aspect of this disclosure.

[0056] First, before describing the process of injecting electrolyte using the electrolyte injection tray 101, an exemplary form of the cylindrical battery cell 100, which is the target of electrolyte injection, will be described.

[0057] Figure 3 The cylindrical battery cell 100 shown represents an unfinished state during the manufacturing process. For example... Figure 3 As shown, the cylindrical battery cell 100 may include an electrode assembly 10, a battery casing 50, and a current collector 40.

[0058] The electrode assembly 10 may be a core-type electrode assembly having a wound center hole formed in the core portion.

[0059] The battery housing 50 can be configured to receive the electrode assembly 10 through an opening formed at one end of its side. Furthermore, the battery housing 50 may include a rolled edge portion 54 formed to be recessed in a radial direction near the one end of the opening.

[0060] The rolled edge portion 54 can be formed by recessing the outer periphery of the battery housing 50, and can be formed to prevent the electrode assembly 10 (which may have a size corresponding to the width of the battery housing 50) from coming out through the opening formed at one end of the battery housing 50.

[0061] The current collector 40 may include a negative current collector and a positive current collector. The negative current collector is connected to the uncoated portion of the negative electrode in the electrode assembly 10, while the positive current collector is connected to the uncoated portion of the positive electrode in the electrode assembly 10.

[0062] As an example Figure 3The current collector 40 shown is a negative current collector. The negative current collector 40 can be connected to the end portion of the electrode assembly 10 adjacent to the opening portion. Furthermore, the current collector 40 can be electrically connected to the battery housing 50. In this way, the battery housing 50 connected to the current collector 40 serves as the negative terminal. That is, the battery housing 50 can have the same polarity as the negative terminal of the electrode assembly 10. For this purpose, the battery housing 50 can be formed of a conductive material (e.g., a metal). The material of the battery housing 50 can be a conductive metal (such as aluminum, steel, stainless steel, etc.), but is not limited to this.

[0063] At the same time, Figure 3 The positive current collector, not shown, can be connected to the uncoated portion of the positive electrode disposed on the positive electrode of the electrode assembly 10 on the opposite side of the cylindrical battery cell 100 (i.e., at the lower end of the electrode assembly 10).

[0064] The cylindrical battery cell 100 with electrolyte injected using a hopper 501 and the electrolyte injection tray 101 including the hopper have been described above according to one aspect of the present disclosure. However, the cylindrical battery cell 100 with electrolyte injected using the electrolyte injection tray 101 according to the present disclosure is not necessarily limited to the cylindrical battery cell 100 having the above-described structure.

[0065] Electrolyte is injected into the battery housing 50, which contains the electrode assembly 10, using the electrolyte injection tray 101 according to this disclosure.

[0066] The process of injecting electrolyte into the interior of the battery housing 50 using an electrolyte injection tray according to the present disclosure will be described below.

[0067] For electrolyte injection, the sealing member 400 of the electrolyte injection tray 101 is tightly fitted against the opening of the battery housing 50. At this time, the sealing member 400 can be detachably connected to the opening of the battery housing 50. For example, the sealing member 400 has a mating recess into which the edge of the opening of the battery housing 50 is inserted, and the sealing member 400 can be connected and tightly fitted against the opening of the battery housing 50 in such a way that the edge of the opening of the battery housing 50 is fitted into the mating recess of the sealing member 400.

[0068] Furthermore, the supply nozzle of the electrolyte supply device 900 is in close contact with the O-ring 300 of the electrolyte injection tray 101.

[0069] Subsequently, the electrolyte is injected into the interior of the battery casing 50. At this time, due to the potential energy of the electrolyte flowing into the electrolyte inlet 511 of the hopper 501, an impact may occur when the electrolyte falls, and the potential energy of the electrolyte can be canceled when the electrolyte hits the buffer portion 530 formed in the center of the electrolyte inlet 512 of the hopper body portion 510.

[0070] Specifically, the other side of the hopper body portion 510 where the electrolyte inlet 512 is formed may include a section where the inner diameter gradually decreases toward the electrolyte inlet 512, and one side 531 of the buffer portion 530 may include a shape in which the cross-sectional area gradually decreases in the direction toward the electrolyte inlet 511 of the hopper body portion 510.

[0071] Therefore, the electrolyte flowing into the electrolyte inlet 511 of the hopper 501 impacts the inclined surfaces formed on the other side of the hopper body portion 510 and on one side 531 of the buffer portion 530, and then flows downward along the inclined surfaces, thereby counteracting the potential energy.

[0072] At this time, the length of one side 531 of the buffer portion 530 is formed to be approximately 1 / 3 longer than the length of the cavity of the hopper body portion 510, so that the potential energy of the electrolyte can be fully offset.

[0073] If the length of one side 531 of the buffer portion 530 is less than about one-third of the length of the cavity of the hopper body portion 510, the distance from the electrolyte inlet 511 of the hopper 501 to one side 531 of the buffer portion 530 may become longer, and the electrolyte flowing into the electrolyte inlet 511 of the hopper 501 may cause a lot of splashing after impacting the buffer portion 530. If the electrolyte splashes a lot like this, bubbles may form, thereby creating cavitation inside the battery cell 100.

[0074] However, as described above, according to this disclosure, since the buffer portion 530 has sufficient length, even when the electrolyte flowing into the electrolyte inlet 511 of the hopper 501 impacts the buffer portion 530, the electrolyte flowing into the electrolyte inlet 511 of the hopper 501 will not splash much, and will flow downward along the inclined surface formed on the other side of the hopper body portion 510 and on one side 531 of the buffer portion 530, thereby suppressing the occurrence of bubbles and suppressing the phenomenon of cavitation forming inside the battery cell 100.

[0075] Furthermore, a shape is formed on the other side 532 of the buffer portion 530, with the cross-sectional area gradually decreasing as it protrudes from the electrolyte inlet 512 of the hopper body portion 510, thereby improving the flowability of the electrolyte flowing into the battery housing 50, so that the electrolyte can flow naturally into the battery housing 50.

[0076] Figure 4 An exemplary illustration shows the state in which electrolyte is injected into the interior of the battery casing through an electrolyte injection tray according to the present disclosure.

[0077] Reference Figure 4 This can minimize electrolyte splashing to suppress bubble formation, thereby preventing cavitation inside the battery housing 50, and can naturally inject electrolyte into the interior of the battery housing 50, thereby stably preventing damage to the electrode assembly 10, especially preventing the separator from loosening or collapsing in the core part of the electrode assembly 10.

[0078] With such a construction, according to one aspect of this disclosure, damage to the electrode assembly 10 housed within the battery casing 50 can be reliably prevented during the electrolyte injection process.

[0079] In the following text, reference will be made to Figures 4 to 6 Describe how the implementation of mitigating the effects of electrolyte droplets changes according to the length of the buffer section 530.

[0080] like Figure 4 As shown, the experimental examples have the following characteristics: Figure 4 The buffer portion 530 shown is according to one aspect of the present disclosure, and as an example, the length of one side 531 of the buffer portion 530 corresponds to 3 / 7 of the length of the cavity of the hopper body portion 510.

[0081] like Figure 5 As shown, in the comparative example, the length of one side of the buffer portion corresponds to 1 / 7 of the length of the cavity of the hopper body portion 510.

[0082] Figure 6 The results of shear stress measurements when electrolyte was injected into each of the experimental and comparative examples are shown.

[0083] from Figure 6 As can be seen, the shear stress generated in the comparative example is approximately 6 times higher than that generated in the experimental example. Even with a buffer in the comparative example, diaphragm loosening or collapse may still occur in the core portion of the electrode assembly 10 during the electrolyte injection process.

[0084] In other words, experiments have confirmed that simply placing the buffer portion 530 in the hopper 501 is insufficient to alleviate the occurrence of shear stress, and the length of one side 531 of the buffer portion 530 must be formed to be at least 1 / 3 longer than the length of the cavity of the hopper body portion 510 in order to fully counteract the potential energy of the electrolyte.

[0085] Although the operations are described in a specific order in the accompanying drawings, this should not be construed as requiring these operations to be performed in the specific order shown or in a sequential order, or that all shown operations be performed to achieve the desired result. In some cases, multitasking and parallel processing may be advantageous. Furthermore, the separation of the various system modules and components in the foregoing aspects should not be interpreted as requiring such separation in all aspects, and it should be understood that the described program components and systems can generally be integrated together in a single software product or packaged into multiple software products.

[0086] While various aspects of this disclosure have been described above with reference to the accompanying drawings, those skilled in the art will understand that this disclosure may be implemented in other specific forms without altering the technical spirit or essential features of this disclosure. Therefore, the foregoing aspects should be understood as illustrative rather than restrictive in all respects, the scope of this disclosure is described in detail in the appended claims, and all changes or modifications derived from the meaning, scope, and equivalent concepts of the claims should be interpreted as falling within the scope of this disclosure.

[0087] <Detailed Description of Key Components>

[0088] 10: Electrode Assembly

[0089] 40: Current Collector

[0090] 50: Battery casing

[0091] 54: Curled edge section

[0092] 100: Battery cell

[0093] 101: Electrolyte Injection Tray

[0094] 300: O-ring

[0095] 400: Sealing component

[0096] 501: Hopper

[0097] 510: Hopper body section

[0098] 511: Electrolyte inlet

[0099] 512: Electrolyte injection port

[0100] 530: Buffer section

[0101] 900: Electrolyte supply device

[0102] Industrial application

[0103] This invention can be used to provide a hopper and an electrolyte injection tray including the hopper for reliably preventing damage to electrode assemblies housed within a battery casing during an electrolyte injection process.

Claims

1. A hopper, the hopper comprising: The hopper body has an electrolyte inlet on one side and an electrolyte injection port on the other side, and the hopper body has a cavity connecting the electrolyte inlet and the electrolyte injection port. as well as A buffer section is formed at the center of the electrolyte injection port in the hopper body section.

2. The hopper according to claim 1, wherein, The hopper body portion includes a section on the other side of the electrolyte injection port, where the inner diameter gradually decreases toward the electrolyte injection port.

3. The hopper according to claim 1, wherein, One side of the buffer section includes a shape in which the cross-sectional area gradually decreases toward the electrolyte inlet of the hopper body section.

4. The hopper according to claim 3, wherein, The length of one side of the buffer section is one-third longer than the length of the cavity of the hopper body section.

5. The hopper according to claim 3, wherein, The other side of the buffer section protrudes to the outside of the electrolyte injection port of the hopper body.

6. The hopper according to claim 5, wherein, The other side of the buffer portion includes a shape in which the cross-sectional area gradually decreases as the other side protrudes from the electrolyte inlet of the hopper body portion.

7. An electrolyte injection tray, the electrolyte injection tray being configured to connect between an electrolyte supply device for supplying electrolyte to the interior of a battery cell and an opening formed on one side of a battery casing, the electrolyte injection tray comprising: Hopper, the hopper comprising: The hopper body portion has an electrolyte inlet formed on one side facing the electrolyte supply device, and an electrolyte injection port formed on the other side facing the opening of the battery casing. The hopper body portion also has a cavity connecting the electrolyte inlet and the electrolyte injection port. A buffer section, the buffer section being formed at the center of the electrolyte injection port in the hopper body section; and A sealing member is connected to the electrolyte injection port of the hopper and fits tightly against the opening of the battery casing when electrolyte is injected.

8. The electrolyte injection tray according to claim 7, wherein, The hopper body portion includes a section on the other side of the electrolyte injection port, where the inner diameter gradually decreases toward the electrolyte injection port.

9. The electrolyte injection tray according to claim 7, wherein, One side of the buffer section includes a shape in which the cross-sectional area gradually decreases toward the electrolyte inlet of the hopper body section.

10. The electrolyte injection tray according to claim 9, wherein, The length of one side of the buffer section is one-third longer than the length of the cavity of the hopper body section.

11. The electrolyte injection tray according to claim 9, wherein, The other side of the buffer portion protrudes to the outside of the electrolyte injection port of the hopper body portion and is located inside the sealing member.

12. The electrolyte injection tray according to claim 11, wherein, The other side of the buffer portion includes a shape in which the cross-sectional area gradually decreases as the other side protrudes from the electrolyte inlet of the hopper body portion.

13. The electrolyte injection tray according to claim 7, wherein the electrolyte injection tray further comprises an O-ring connected to the electrolyte inlet of the hopper and closely fitting the supply nozzle of the electrolyte supply device when the electrolyte is injected.

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