Hopper and electrolyte injection pallet including same

Abstract

A hopper according to the present invention comprises: a hopper body unit having an electrolyte inlet formed at one end thereof, an electrolyte outlet formed at the other end thereof, and a hollow for connecting the electrolyte inlet and the electrolyte outlet; and a buffer unit formed at the center of the electrolyte outlet of the hopper body unit.

Description

Hopper and pallet for injecting electrolyte including the same

[0001] The present invention relates to a hopper and a pallet for injecting an electrolyte containing the same.

[0002] Secondary batteries, which offer high applicability across product lines and possess electrical characteristics such as high energy density, are widely applied not only to portable devices but also to electric vehicles (EVs) or hybrid electric vehicles (HEVs) powered by electric driving sources.

[0003] These secondary batteries are attracting attention as a new energy source for improving eco-friendliness and energy efficiency, as they not only have the primary advantage of being able to drastically reduce the use of fossil fuels but also the advantage of not generating any by-products from the use of energy.

[0004] Meanwhile, an electrolyte may be contained within the secondary battery along with an electrode assembly. In the manufacture of the secondary battery, a hole may be formed again for injecting the 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] In any of these cases, it is necessary to ensure that the electrolyte does not leak out of 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, the electrolyte can be injected after the electrode assembly is inserted through an opening on one side of the housing. The electrolyte can be injected by inserting one side of a pallet configured to connect the electrolyte supply device and the secondary battery into the opening of the housing of the secondary battery, and by supplying the electrolyte using an electrolyte supply device connected to the other side of the pallet.

[0007] However, there is a problem in that the separator of the electrode assembly located inside the secondary battery is released or collapses due to the potential energy generated by the falling of the electrolyte during the process of injecting the electrolyte into the secondary battery. In particular, a large pressure is applied to the core of the electrode assembly during the electrolyte injection process, which causes defects in the secondary battery.

[0008] Accordingly, the present invention provides a hopper capable of preventing damage to an electrode assembly housed inside a battery case during an electrolyte injection process, and a pallet for electrolyte injection including the same.

[0009] However, the technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems will be clearly understood by a person skilled in the art from the description of the invention below.

[0010] A hopper according to one embodiment of the present invention for solving the above-mentioned problem comprises a hopper body portion having an electrolyte inlet formed at one end and an electrolyte injection port formed at the other end, and a hollow 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.

[0011] In addition, the other side of the hopper body portion where the electrolyte inlet is formed may include a section in which the inner diameter decreases as it approaches the electrolyte inlet.

[0012] One side of the above buffer section may include a shape in which the cross-sectional area decreases as it moves toward the direction of the electrolyte inlet of the hopper body section.

[0013] In addition, the length of one side of the buffer portion may be formed to be longer than 1 / 3 of the length of the hollow of the hopper body portion.

[0014] The other side of the above buffer part may protrude outside the electrolyte inlet of the above hopper body part.

[0015] In addition, the other side of the buffer may include a shape in which the cross-sectional area decreases as it protrudes from the electrolyte inlet of the hopper body.

[0016] Meanwhile, the present invention relates to a pallet for injecting an electrolyte, configured to connect an electrolyte supply device that supplies an electrolyte to the interior of a battery cell and an opening formed on one side of a battery case. The pallet for injecting an electrolyte includes a hopper body portion having an electrolyte inlet formed at one end facing the electrolyte supply device and an electrolyte inlet formed at the other end facing the opening of the battery case, and a hollow connecting the electrolyte inlet and the electrolyte inlet; a hopper including a buffer portion formed in the center of the electrolyte inlet of the hopper body portion; and a sealing member coupled to the electrolyte inlet of the hopper and in close contact with the opening of the battery case when the electrolyte is injected.

[0017] In addition, the other side of the hopper body portion where the electrolyte inlet is formed may include a section in which the inner diameter decreases as it approaches the electrolyte inlet.

[0018] One side of the above buffer section may include a shape in which the cross-sectional area decreases as it moves toward the direction of the electrolyte inlet of the hopper body section.

[0019] In addition, the length of one side of the buffer portion may be formed to be longer than 1 / 3 of the length of the hollow of the hopper body portion.

[0020] The other side of the above buffer part may protrude out of the electrolyte inlet of the above hopper body part and be located within the sealing member.

[0021] In addition, the other side of the buffer may include a shape in which the cross-sectional area decreases as it protrudes from the electrolyte inlet of the hopper body.

[0022] In addition, the above-described electrolyte injection pallet may further include an O-ring that is coupled to the electrolyte inlet of the hopper and comes into close contact with the supply nozzle of the electrolyte supply device when the electrolyte is injected.

[0023] According to the present invention, damage to the electrode assembly housed inside the battery case can be reliably prevented during the electrolyte injection process.

[0024] However, the effects obtainable through the present invention are not limited to those described above, and other unmentioned technical effects will be clearly understood by a person skilled in the art from the description of the invention below.

[0025]

[0026] FIG. 1 is a longitudinal cross-sectional view illustrating a hopper according to one embodiment of the present invention.

[0027] FIG. 2 is a longitudinal cross-sectional view illustrating a pallet for injecting electrolyte including the hopper of FIG. 1.

[0028] Figure 3 is a diagram illustrating the process of injecting an electrolyte using the electrolyte injection pallet of Figure 2.

[0029] Figure 4 is a diagram showing the electrolyte injected through the electrolyte injection pallet of Figure 2.

[0030] Figure 5 is a diagram showing the state of injecting an electrolyte using an electrolyte injection pallet according to a comparative example.

[0031] Figure 6 is a graph comparing the change in shear stress occurring during the process of injecting the electrolyte according to the experimental example of Figure 4 and the comparative example of Figure 5.

[0032] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Accordingly, in some embodiments, well-known process steps, well-known device structures, and well-known techniques are not specifically described to avoid the present invention being interpreted ambiguously. Throughout the specification, like reference numerals refer to like components.

[0033] In the drawings, thicknesses have been enlarged to clearly represent various layers and regions. Throughout the specification, the same reference numerals have been used for similar parts. When a part such as a layer, film, region, or plate is described as being "above" another part, this includes not only cases where it is "immediately above" another part, but also cases where there is another part in between. Conversely, when a part is described as being "immediately above" another part, it means that there is no other part in between. Furthermore, when a part such as a layer, film, region, or plate is described as being "below" another part, this includes not only cases where it is "immediately below" another part, but also cases where there is another part in between. Conversely, when a part is described as being "immediately below" another part, it means that there is no other part in between.

[0034] Throughout the specification, unless specifically stated otherwise, each component may be singular or plural.

[0035]

[0036] Hereinafter, a hopper (501) according to one embodiment of the present invention and a pallet (101) for injecting an electrolyte including the same will be described with reference to FIGS. 1 to 3.

[0037] A hopper (501) and an electrolyte injection pallet (101) including the same, according to one embodiment of the present invention, are configured to connect an electrolyte supply device (900) that supplies electrolyte to the interior of a battery cell (100) and an opening formed on one side of a battery case (50), and are used to seal the connection portion between the electrolyte supply device (900) and the battery cell (100) to prevent leakage of electrolyte so that the electrolyte does not leak to the outside of the battery cell (100) during the electrolyte injection process.

[0038] FIG. 1 is a drawing for explaining a hopper (501) according to one embodiment of the present invention, FIG. 2 is a drawing for explaining an electrolyte injection pallet (101) including the hopper (501), and FIG. 3 is a drawing for explaining the process of injecting an electrolyte using the electrolyte injection pallet (101).

[0039]

[0040] Referring to FIG. 1, a hopper (501) is used to guide the electrolyte supplied by the electrolyte supply device (900) (shown in FIG. 3) into the interior of the battery case (50). Specifically, the hopper (501) includes a hopper body part (510) and a buffer part (530).

[0041] The hopper main body (510) has an electrolyte inlet (511) formed at one end and an electrolyte inlet (512) formed at the other end, and has a hollow connecting the electrolyte inlet (511) and the electrolyte inlet (512).

[0042] At this time, the other side of the hopper body (510) in which the electrolyte inlet (512) is formed may include a section in which the inner diameter decreases as it approaches the electrolyte inlet (512).

[0043] That is, the inner diameter of the electrolyte inlet (512) is formed to be smaller than the inner diameter of the electrolyte inlet (511), and the inner diameter of the other side where the electrolyte inlet (512) is formed can be gradually reduced as it approaches the electrolyte inlet (512).

[0044] Accordingly, the electrolyte flowing into the electrolyte inlet (511) strikes the inclined surface formed in the hollow on the other side of the hopper body (510), thereby mitigating the impact.

[0045] The buffer section (530) also offsets the potential energy of the electrolyte introduced into the electrolyte inlet (511) of the hopper main body (510).

[0046] Specifically, one side (531) of the buffer section (530) may include a shape in which the cross-sectional area decreases as it moves toward the direction of the electrolyte inlet (511) of the hopper main body (510). Also, the length of one side (531) of the buffer section (530) may be formed to be longer than about 1 / 3 of the length of the hollow of the hopper main body (510). In other words, the distance from the electrolyte inlet (511) of the hopper main body (510) to one side (531) of the buffer section (530) may be formed to be smaller than 2 / 3 of the distance from the electrolyte inlet (511) of the hopper main body (510) to the electrolyte inlet (512).

[0047] Accordingly, the electrolyte flowing into the electrolyte inlet (511) of the hopper body (510) strikes the inclined surface formed on one side (5310) of the buffer section (530) and then flows down along the inclined surface, thereby canceling out potential energy.

[0048] In addition, according to one embodiment of the present invention, since one side (531) of the buffer section (530) has a sufficient length, the distance from the electrolyte inlet (511) of the hopper main body (510) to one side (531) of the buffer section (530) is shortened, so that the electrolyte flowing into the electrolyte inlet (511) of the hopper main body (510) can fall and collide with the buffer section (530), thereby reducing the splashing phenomenon. If the length of one side (531) of the buffer section (530) is formed to be smaller than about 1 / 3 of the length of the hollow of the hopper main body (510), the distance from the electrolyte inlet (511) of the hopper main body (510) to one side (531) of the buffer section (530) is increased, and when the electrolyte falls due to the potential energy of the electrolyte introduced into the electrolyte inlet (511) and collides with the buffer section (530), numerous splashes may occur, and due to these splashes of the electrolyte, bubbles are generated, and after the electrolyte is injected into the battery cell (100) (shown in FIG. 3), an air pocket can be formed.

[0049] Additionally, the other side (532) of the buffer section (530) may protrude out of the electrolyte inlet (512) of the hopper main body (510). Furthermore, the other side of the buffer section (530) may include a shape in which the cross-sectional area decreases as it protrudes from the electrolyte inlet (512) of the hopper main body (510). Accordingly, the fluidity of the electrolyte introduced into the battery case (50) is improved, allowing the electrolyte to naturally flow into the battery case (50).

[0050]

[0051] Referring to FIG. 2, the electrolyte injection pallet (101) includes a hopper (501) and a sealing member (400). Additionally, the electrolyte injection pallet (101) may further include an O-ring (300). Here, the hopper (501) is the same as described above in FIG. 1.

[0052] The hopper (501) used in the electrolyte injection pallet (101) is installed such that the electrolyte inlet (511) faces the electrolyte supply device (900) and the electrolyte injection port (512) faces the opening of the battery case (50).

[0053] The sealing member (400) is coupled to the electrolyte inlet (512) of the hopper (501) and comes into close contact with the opening of the battery case (50) when the electrolyte is injected. At this time, the other side of the buffer portion (530) of the hopper (501) may protrude out of the electrolyte inlet (512) of the hopper body portion (510) and be positioned within the sealing member (400).

[0054] The O-ring (300) is connected to the electrolyte inlet (511) of the hopper (501) and can be in close contact with the supply nozzle of the electrolyte supply device (900) when the electrolyte is injected.

[0055] In this way, by attaching a sealing member (400) and an O-ring (300) to each end of the hopper (501), leakage of the electrolyte can be reliably prevented during the electrolyte injection process.

[0056]

[0057] Referring to FIG. 3, the process of injecting an electrolyte using a hopper (501) and an electrolyte injection pallet (101) including the same, according to one embodiment of the present invention, is described.

[0058] First, before explaining the process of injecting the electrolyte using the electrolyte injection pallet (101), we will explain an exemplary form of the cylindrical battery cell (100) that is the target for the electrolyte injection.

[0059] The cylindrical battery cell (100) shown in FIG. 3 represents an unfinished state during the manufacturing process. As shown in FIG. 3, the cylindrical battery cell (100) may include an electrode assembly (10), a battery case (50), and a current collector (40).

[0060] The electrode assembly (10) may be a jelly roll type electrode assembly having a winding center hole formed in the core portion.

[0061] The battery case (50) may be configured to accommodate an electrode assembly (10) through an opening formed at one end. The battery case (50) may include a beading portion (54) formed by a centripetal indentation near the open end.

[0062] This beading portion (54) can be formed by indenting the outer circumference of the battery case (50), and is formed so that an electrode assembly (10) having a size corresponding to the width of the battery case (50) does not come out through an opening formed at one end of the battery case (50).

[0063] The current collector (40) may include a negative current collector connected to a negative non-negative portion provided on the negative electrode of the electrode assembly (10), and a positive current collector connected to a positive non-negative portion provided on the positive electrode of the electrode assembly.

[0064] The current collector (40) illustrated exemplarily in FIG. 3 is a negative current collector. The negative current collector (40) can be coupled to the open end of the electrode assembly (10). The current collector (40) can also be electrically connected to the battery case (50). The battery case (50) connected to the current collector (40) in this way functions as a negative terminal. That is, the battery case (50) can have the same polarity as the negative electrode of the electrode assembly (10). To this end, the battery case (50) can be made of a conductive material such as metal. The material of the battery case (50) can be made of a conductive metal, such as aluminum, steel, stainless steel, etc., but is not limited thereto.

[0065] Meanwhile, the positive current collector not shown in FIG. 3 can be connected to the positive non-positive portion provided on the positive of the electrode assembly (10) at the opposite side of the cylindrical battery cell (100), that is, at the bottom of the electrode assembly (10).

[0066] Although a cylindrical battery cell (100) in which an electrolyte is injected using a hopper (501) and an electrolyte injection pallet (101) including the same according to one embodiment of the present invention has been described above, the cylindrical battery cell (100) in which an electrolyte is injected using an electrolyte injection pallet (101) according to the present invention is not necessarily limited to a cylindrical battery cell (100) having a structure as described above.

[0067] Electrolyte is injected into the interior of a battery case (50) in which the electrode assembly (10) described above is housed, using an electrolyte injection pallet (101) according to the present invention.

[0068] Hereinafter, the process of injecting an electrolyte into the interior of a battery case (50) using an electrolyte injection pallet according to the present invention is described.

[0069] To inject the electrolyte, the sealing member (400) of the electrolyte injection pallet (101) is pressed against the opening of the battery case (50). At this time, the sealing member (400) may be detachably coupled to the opening of the battery case (50). For example, the sealing member (400) may have a coupling groove into which the edge of the opening of the battery case (50) is inserted, and the sealing member (400) may be coupled to and pressed against the opening of the battery case (50) in such a way that the edge of the opening of the battery case (50) is fitted into the coupling groove of the sealing member (400).

[0070] And the injection nozzle of the electrolyte injection supply device (900) is brought into close contact with the O-ring (300) of the electrolyte injection pallet (101).

[0071] Subsequently, the electrolyte is injected into the interior of the battery case (50). At this time, an impact occurs when the electrolyte falls due to the potential energy of the electrolyte introduced through the electrolyte inlet (511) of the hopper (501). This potential energy of the electrolyte can be offset by hitting the buffer (530) formed in the center of the electrolyte inlet (512) of the hopper body (510).

[0072] Specifically, the other side of the hopper body (510) in which the electrolyte inlet (512) is formed includes a section in which the inner diameter decreases as it approaches the electrolyte inlet (512), and one side (531) of the buffer section (530) may include a shape in which the cross-sectional area decreases as it approaches the electrolyte inlet (511) of the hopper body (510).

[0073] Accordingly, the electrolyte introduced into the electrolyte inlet (511) of the hopper (501) strikes the inclined surface formed on the other side of the hopper body (510) and on one side (531) of the buffer (530), respectively, and then flows down along the inclined surface, thereby canceling out potential energy.

[0074] At this time, the length of one side (531) of the buffer section (530) is formed to be longer than about 1 / 3 of the length of the hollow of the hopper main body (510), so that the potential energy of the electrolyte can be sufficiently offset.

[0075] If the length of one side (531) of the buffer section (530) is shorter than about 1 / 3 of the length of the hollow of the hopper body (510), the distance from the electrolyte inlet (511) of the hopper (501) to one side (531) of the buffer section (530) becomes longer, and the electrolyte flowing into the electrolyte inlet (511) of the hopper (501) hits the buffer section (530) and causes a lot of splashing. When the electrolyte splashes a lot in this way, bubbles are generated and can form an air pocket inside the battery cell (100).

[0076] However, as described above, according to the present invention, since the buffer section (530) has a sufficient length, the electrolyte flowing into the electrolyte inlet (511) of the hopper (501) does not splash much even when it hits the buffer section (530), and flows down along the inclined surface formed on the other side of the hopper main body (510) and on one side (531) of the buffer section (530), thereby suppressing the generation of bubbles and suppressing the phenomenon of air pockets being formed inside the battery cell (100).

[0077] In addition, a shape is formed on the other side (532) of the buffer section (530) such that the cross-sectional area decreases as it protrudes from the electrolyte inlet (512) of the hopper main body (510), thereby improving the fluidity of the electrolyte introduced into the battery case (50) and allowing the electrolyte to be naturally introduced into the battery case (50).

[0078]

[0079] Figure 4 illustrates an exemplary form in which an electrolyte is injected into the interior of a battery case through an electrolyte injection pallet according to the present invention.

[0080] Referring to FIG. 4, splashing of the electrolyte is minimized to suppress the generation of bubbles, thereby preventing the formation of air pockets inside the battery case (50), and also naturally injecting the electrolyte into the battery case (50), thereby reliably preventing damage to the electrode assembly (10), particularly the separator from loosening or collapsing in the core part of the electrode assembly (10).

[0081]

[0082] According to one embodiment of the present invention, by such a configuration, damage to the electrode assembly (10) housed inside the battery case (50) can be reliably prevented during the electrolyte injection process.

[0083]

[0084] Hereinafter, with reference to FIGS. 4 to 6, we will examine how the performance of mitigating the drop shock of the electrolyte changes depending on the length of the buffer section (530).

[0085] The experimental example has a buffer section (530) according to one embodiment of the present invention as illustrated in FIG. 4, and, for example, the length of one side (531) of the buffer section (530) is 3 / 7 of the length of the hollow of the hopper body section (510).

[0086] As shown in FIG. 5, the comparative example has a length on one side of the buffer section that corresponds to 1 / 7 of the length of the hollow of the hopper main body (510).

[0087] Figure 6 shows the results of measuring the shear stress generated when the electrolyte is injected in the experimental example and the comparative example, respectively.

[0088] As can be seen in Fig. 6, it can be confirmed that in the comparative example, shear stress is about 6 times higher than in the experimental example. In the comparative example, even though a buffer is present, the separator may unravel or collapse in the core part of the electrode assembly (10) during the electrolyte injection process.

[0089] That is, it can be confirmed through experiments that the effect of mitigating the occurrence of shear stress is not sufficient merely by having a buffer section (530) in the hopper (501), and that the length of one side (531) of the buffer section (530) must be formed to be at least 1 / 3 longer than the length of the hollow of the hopper body (510) in order to sufficiently offset the potential energy of the electrolyte.

[0090]

[0091] Although operations are depicted in a specific order in the drawings, it should not be understood that the operations must be executed in the specific order depicted or in a sequential order, or that all depicted operations must be executed to obtain the desired result. In certain situations, multitasking and parallel processing may be advantageous. Furthermore, the separation of the various configurations in the embodiments described above should not be understood as a necessary separation, and it should be understood that the described program components and systems can generally be integrated together into a single software product or packaged into multiple software products.

[0092] The above description is merely an illustrative explanation of the technical concept of the present embodiment, and a person skilled in the art to which the present embodiment belongs would be able to make various modifications and variations within the scope of the essential characteristics of the present embodiment. Accordingly, the present embodiments are intended to explain, not limit, the technical concept of the present embodiment, and the scope of the technical concept of the present embodiment is not limited by these embodiments. The scope of protection of the present embodiment shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present embodiment.

[0093] < Explanation of Symbols >

[0094] 10: Electrode assembly

[0095] 40: Whole house

[0096] 50: Battery case

[0097] 54: Bidding Department

[0098] 100: Battery cell

[0099] 101: Pallet for electrolyte injection

[0100] 300: O-ring

[0101] 400: Sealing member

[0102] 501: Hopper

[0103] 510: Hopper main body

[0104] 511: Electrolyte inlet

[0105] 512: Electrolyte inlet

[0106] 530: Buffer

[0107] 900: Electrolyte supply device

[0108] The present invention can be used to provide a hopper for reliably preventing damage to an electrode assembly housed inside a battery case during an electrolyte injection process, and a pallet for electrolyte injection including the same.

Claims

1. A hopper body part having an electrolyte inlet formed at one end and an electrolyte injection port formed at the other end, and a hollow connecting the electrolyte inlet and the electrolyte injection port; A buffer formed in the center of the electrolyte inlet of the hopper body. A hopper including 2. In Paragraph 1, A hopper characterized in that the other side of the hopper body portion where the electrolyte inlet is formed includes a section in which the inner diameter decreases as it approaches the electrolyte inlet.

3. In Paragraph 1, A hopper characterized in that one side of the buffer portion includes a shape in which the cross-sectional area decreases as it moves toward the direction of the electrolyte inlet of the hopper body portion.

4. In Paragraph 3, A hopper characterized in that the length of one side of the buffer portion is longer than 1 / 3 of the length of the hollow of the hopper body portion.

5. In Paragraph 3, A hopper characterized in that the other side of the buffer portion protrudes out of the electrolyte inlet of the hopper body portion.

6. In Paragraph 5, A hopper characterized in that the other side of the buffer portion has a shape in which the cross-sectional area decreases as it protrudes from the electrolyte inlet of the hopper body portion.

7. An electrolyte injection pallet configured to connect an electrolyte supply device that supplies electrolyte to the interior of a battery cell and an opening formed on one side of a battery case, wherein A hopper comprising: a hopper body portion having an electrolyte inlet formed at one end facing the electrolyte supply device and an electrolyte injection port formed at the other end facing the opening of the battery case, and a hollow 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; and A sealing member coupled to the electrolyte inlet of the hopper and in close contact with the opening of the battery case when the electrolyte is injected. A pallet for injecting electrolyte containing 8. In Paragraph 7, A pallet for injecting electrolyte, characterized in that the other side of the hopper body portion having the electrolyte inlet formed therein includes a section in which the inner diameter decreases as it approaches the electrolyte inlet.

9. In Paragraph 7, A pallet for injecting electrolyte, characterized in that one side of the buffer portion includes a shape in which the cross-sectional area decreases as it moves toward the direction of the electrolyte inlet of the hopper body portion.

10. In Paragraph 9, A pallet for injecting electrolyte, characterized in that the length of one side of the buffer section is longer than 1 / 3 of the length of the hollow of the hopper main body section.

11. In Paragraph 9, A pallet for injecting electrolyte, characterized in that the other side of the buffer portion protrudes out of the electrolyte inlet of the hopper body portion and is located within the sealing member.

12. In Paragraph 11, A pallet for injecting electrolyte, characterized in that the other side of the buffer portion has a shape in which the cross-sectional area decreases as it protrudes from the electrolyte inlet of the hopper body portion.

13. In Paragraph 7, A pallet for injecting electrolyte, characterized by further including an O-ring coupled to the electrolyte inlet of the hopper and in close contact with the supply nozzle of the electrolyte supply device when the electrolyte is injected.

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