JP5531641B2 - Electrolyte injection device and electrolyte injection method - Google Patents

Description

  The present invention relates to an electrolyte injection device and an electrolyte injection method.

  As a conventional electrolytic solution injection method, there is a method in which a convex portion is provided on the current collector, and the electrolytic solution is injected so that an angle formed by the electrolytic solution injection direction and the direction of the center line between the convex portions is a predetermined angle. (See Patent Document 1).

JP 2008-235134 A

  However, the conventional electrolytic solution injection method described above has a problem that the air in the battery tends to stay inside without being discharged to the outside, and it takes time to impregnate the electrolytic solution.

  The present invention has been made paying attention to such conventional problems, and aims to shorten the impregnation time of the electrolytic solution.

  The present invention relates to an electrolytic solution injection device for injecting an electrolytic solution from an electrolytic solution injection port provided in a part of an opening of an exterior body while sandwiching an exterior body in which a battery element is stored and applying a surface pressure to the battery element. It is. A high pressing portion that partially increases the surface pressure applied to the battery element so that the injected electrolyte flows toward an air outlet provided at a position different from the electrolyte inlet of the opening of the exterior body. It is characterized by providing.

  The present invention also relates to an electrolytic solution injecting method for injecting an electrolytic solution from an electrolytic solution injection port provided in a part of an opening of the external body while sandwiching an external body in which the battery element is stored and applying a surface pressure to the battery element. . Then, a high pressing step of partially increasing the surface pressure applied to the battery element so that the injected electrolyte flows toward the air discharge port provided at a position different from the electrolyte injection port of the opening of the exterior body. It is characterized by providing.

  According to the present invention, the air inside the exterior body can be guided to the air discharge port according to the flow of the electrolytic solution and discharged from the air discharge port. Therefore, air does not stay inside the exterior body, and the impregnation time of the electrolytic solution can be shortened.

It is the schematic of a lithium ion secondary battery. It is a perspective view of the electrolyte solution injection apparatus used when inject | pouring electrolyte solution into the inside of an exterior body. It is a figure which shows the holding surface of the holding plate by 1st Embodiment. It is a figure explaining the effect of the holding plate by 1st Embodiment. FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 4 and illustrates the effect of the dot portion. It is the figure which represented typically the position of a 1st guide, a 2nd guide, and a dot part when an exterior body is hold | maintained with the holding plate by 2nd Embodiment. It is the figure which represented typically the position of a 1st guide, a 2nd guide, and a dot part when an exterior body is hold | maintained with the holding plate by 3rd Embodiment. It is the figure which represented typically the position of the dot part when an exterior body is hold | maintained with the holding plate by 4th Embodiment. It is the figure which represented typically the position of a 1st guide, a 2nd guide, and a dot part when the exterior body 2 is hold | maintained with the holding plate by 5th Embodiment. It is the figure which represented typically the position of the 1st guide when the exterior body 2 was hold | maintained with the holding plate by 6th Embodiment, a 2nd guide, and a dot part. It is the figure which represented typically a mode that electrolyte solution impregnates a separator, when electrolyte solution is inject | poured using the holding plate by a comparative example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic diagram of a lithium ion secondary battery 100 according to the present embodiment. 1A is a plan view of the lithium ion secondary battery 100, and FIG. 1B is a cross-sectional view taken along the line BB in FIG. 1A.

  As shown in FIG. 1A and FIG. 1B, a lithium ion secondary battery 100 includes a positive electrode plate 11, a negative electrode plate 12, and a microporous separator 13, and these battery elements 1 Are laminated and sealed by the exterior body 2.

  The positive electrode plate 11 is obtained by applying a positive electrode active material that occludes and releases lithium ions to both the front and back surfaces of the electrode plate.

  The negative electrode plate 12 is obtained by applying a negative electrode active material that releases and occludes lithium ions to both front and back surfaces of the electrode plate.

  The separator 13 is sandwiched between the positive electrode plate 11 and the negative electrode plate 12 to prevent a short circuit due to contact between both electrode plates.

  Each of the positive electrode plate 11 and the negative electrode plate 12 is connected to a terminal 3 for taking out electric power, and a part of the terminal 3 protrudes from the exterior body 2.

  The exterior body 2 is obtained by thermally welding the peripheral portion (hereinafter referred to as “exterior body peripheral portion”) 21 of two laminated laminate films.

  In this embodiment, in order to enable movement of lithium ions between the positive electrode plate 11 and the negative electrode plate 12, an electrolyte solution, which is a liquid electrolyte, is injected into the interior of the exterior body 2 before completely sealing it. The separator 13 is impregnated with an electrolytic solution.

  FIG. 2 is a perspective view of the electrolyte solution injection device 4 used when the electrolyte solution is injected into the exterior body 2.

  The electrolyte injection device 4 includes an L-shaped plate 41, a support bar 42, and a holding plate 43. The electrolyte solution injection device 4 suppresses generation of wrinkles in the separator 13 by pressing both surfaces of the exterior body 2 with the holding plate 43 when injecting the electrolyte into the exterior body 2 housing the battery element 1.

  The L-shaped plate 41 includes a bottom plate 41a and a side plate 41b.

  The support bars 42 are fixed to the four corners of the side plate 41b. A male screw for attaching the nut 44 is formed at the tip of the support bar 42.

  A plurality of holding plates 43 are arranged on the bottom plate 41a so as to be sandwiched between the left and right support bars 42 so as to be parallel to the side plate 41b. The holding plate 43 is arranged at a predetermined interval. In the holding plate 43 arranged on the outermost surface of the electrolytic solution injector 4, insertion holes for inserting the support rods 42 are formed at the four corners. Hereinafter, the holding plate 43 disposed on the outermost surface of the electrolytic solution injector 4 is referred to as “outermost holding plate 43a”, and the other holding plates 43 are referred to as “internal holding plate 43b”. That's it.

  The lithium ion secondary battery 100 is disposed in a state where the upper part of the outer periphery part 21 is opened between adjacent holding plates 43, that is, in a state where only the lower part, the right part, and the left part of the outer periphery part 21 are sealed. Is done.

  The outermost holding plate 43 a is inserted into the support bar 42 after the lithium ion secondary battery 100 is disposed between the adjacent holding plates 43, and then, with the nut 44 through the spring 45 inserted into the support bar 42. It is tightened and fixed to the support rod 42 (high pressing step).

  The spring 45 has one end in contact with the outermost holding plate 43a and the other end in contact with the nut 44, and applies an axial force of the support rod 42 to the outermost holding plate 43a. The axial force that the spring 45 applies to the outermost holding plate 43 a becomes the surface pressure that each holding plate 43 applies to the exterior body 2. Therefore, by adjusting the tightening amount of the nut 44, the surface pressure applied to the exterior body 2 by each holding plate 43 can be adjusted.

  Here, by the inventors' diligent research, the holding surface of the holding plate 43 (the surface in contact with the lithium ion secondary battery 100) is flattened and the electrolyte solution is injected while applying a uniform surface pressure to the exterior body 2. It was found that air collected in the central portion of the separator 13 and impregnation of the electrolytic solution was hindered.

  FIG. 11 schematically shows how the separator 13 is impregnated with the electrolytic solution when the electrolytic solution is injected using a comparative holding plate having a flat holding surface, unlike the holding plate 43 according to the present embodiment. FIG. In FIG. 11, the electrolytic solution is injected from the upper side in the figure.

  As shown in FIG. 11, when the electrolytic solution is injected using a holding plate having a flat holding surface, the electrolytic solution is gradually impregnated from the outer periphery to the inside of the separator 13. For this reason, there is no place for air to escape, and an air pool is formed at the center of the separator 13. As a result, since the impregnation of the electrolytic solution into the portion where the air pocket is formed is inhibited, there arises a problem that the time for impregnating the separator 13 with the electrolytic solution cannot be easily reduced.

  Therefore, in the present embodiment, a protrusion capable of partially increasing the surface pressure applied to the exterior body 2 is provided on the holding surface of the holding plate 43, and the flow of the electrolyte is controlled so that air is discharged from the inside. .

  FIG. 3 is a view showing the holding surface of the holding plate 43 according to the present embodiment, and the lower side in the drawing is the side in contact with the bottom plate 41 a of the L-shaped plate 41.

  As shown in FIG. 3, the first guide 431, the second guide 432, and the dot portion 433 are formed on the holding surface of the holding plate 43.

  The first guide 431 is a band-shaped protrusion formed on the diagonal line of the holding plate 43 so as to go from the central portion to the upper portion of the holding plate peripheral portion.

  The second guide 432 is a belt-like protrusion formed vertically below the first guide 431 and on the right part of the peripheral edge of the holding plate.

  A plurality of dot-shaped protrusions (hereinafter referred to as “dots”) 433 a are formed on the dot portion 433 at predetermined intervals. The dot portion 433 is formed at the peripheral edge of the holding plate below the first guide 431 and above the second guide 432.

  The heights of the dots 433a of the first guide 431, the second guide 432, and the dot portion 433 are all the same, and are about 100 [μm] in the present embodiment.

  FIG. 4 is a diagram for explaining the operational effects of the holding plate 43 according to the present embodiment. In order to facilitate understanding of the invention, the flow of the electrolyte and air is indicated by arrows, and the first guide 431, the second guide 432, and the dot portion 433 when the exterior body 2 is held by the holding plate 43 are shown. Indicated the position. The size of the separator 13 is indicated by a broken line.

  The portion sandwiched between the first guide 431, the second guide 432, and the dot portion 433 of the holding plate 43 disposed on both surfaces of the exterior body 2 has a higher surface pressure than other portions. Therefore, as shown in FIG. 4, the electrolyte injected from the electrolyte injection port 50 at the center of the upper opening of the outer package 2 first flows obliquely downward to the left in the drawing along the first guide 431. The electrolyte flowing along the first guide 431 diagonally to the left in the drawing and flowing to the bottom of the exterior body 2 flows to the right in the drawing, and is then guided by the first guide 431 and the second guide 432. In this manner, the fluid flows obliquely upward to the right toward the dot portion 433 through the center portion.

  At this time, the second guide 432 prevents the electrolyte from entering from the outer peripheral edge side to the inside in addition to guiding the electrolyte to flow toward the dot portion 433. Further, the dot portion 433 does not completely prevent the electrolyte from entering from the outer periphery side of the outer package, but reduces the impregnation rate of the electrolyte from the outer periphery of the outer package by suppressing the intrusion. The effect of the dot portion 433 will be described later with reference to FIG.

  Therefore, when the electrolytic solution is injected using the holding plate 43 according to the present embodiment, the electrolytic solution is not uniformly impregnated from the outer periphery of the separator 13 to the inside as in the comparative example. The separator 13 is impregnated with the electrolyte according to the flow of the electrolyte indicated by the arrow.

  As a result, air existing between the separator 13 and between the separator 13 and the electrode plates (the positive electrode plate 11 and the negative electrode plate 12) can be pushed out toward the dot portion 433 according to the flow of the electrolytic solution. Accordingly, the air can be discharged from the air discharge port 60 on the right side of the upper opening of the exterior body 2 through the dot portion 433.

  As described above, in this embodiment, a part of the upper opening of the outer package 2 different from the electrolyte injection port 50 is used as the air discharge port 60 to partially increase the surface pressure applied to the lithium ion secondary battery 100. A flow path is formed so that the electrolyte flows from the electrolyte inlet 50 toward the air outlet 60.

  FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 4 and illustrates the effect of the dot portion 433.

  As shown in FIG. 5, since the separator 13 and the electrode plates 11 and 12 are in close contact with each other by the surface pressure P1 due to the dot 433a, the portion sandwiched between the dots 433a passes through the gap between the separator 13 and the electrode plates 11 and 12. Thus, it is possible to prevent the electrolyte from entering from the outer peripheral edge side.

  Further, by pressing with the dots 433a, the surface pressure around the portion sandwiched between the dots 433a is also increased by the rigidity of the electrode plates 11 and 12. Therefore, the surface pressure P2 (<P1) between the dots also increases, and in the dot portion 433, the degree of adhesion between the separator 13 and the electrode plates 11 and 12 increases even in the portion not sandwiched by the dots 433a.

  As a result, the portion of the dot portion 433 that is not sandwiched between the dots 433a cannot completely prevent the electrolyte from entering from the outer periphery through the gap between the electrode plates 11 and 12 and the separator 13. , The intrusion can be suppressed. Further, since the electrode plates 11 and 12 and the separator 13 are not completely in close contact with each other, the internal air can be discharged from the gap between the electrode plates 11 and 12 and the separator 13.

  In this way, the dot portion 433 suppresses the intrusion of the electrolytic solution to reduce the rate at which the electrolytic solution is impregnated from the outer periphery to the inside, and also exists inside the separator 13 and between the electrode plates 11 and 12 and the separator 13. It functions as a part of the air discharge port 60 for discharging the air to be discharged to the outside.

  According to the present embodiment described above, a part of the upper opening of the outer package 2 different from the electrolyte solution inlet 50 is used as the air outlet 60. Then, by providing the first guide 431, the second guide 432, and the dot portion 433 on the holding surface of the holding plate 43, the surface pressure partially applied to the lithium ion secondary battery 100 is increased, and the electrolyte is injected into the electrolyte. It was made to flow toward the air outlet 60 from the inlet 50.

  Specifically, the first guide 431 guides the electrolyte injected from the electrolyte injection port 50 so as to flow down toward the outer periphery of the exterior body, and then the first guide 431 and the second guide 432 It guides so that it may flow toward the air discharge port 60 through the center part of an exterior body.

  Thereby, the air which exists in the inside of the separator 13 or between the separator 13 and the electrode plates 11 and 12 can be guided to the air outlet 60 according to the flow of the electrolytic solution, and can be discharged from the air outlet 60. Therefore, since air does not accumulate in the central portion of the separator, the time for impregnation of the electrolyte into the separator 13 can be shortened.

  Further, since the second guide 432 is provided so as to sandwich the vicinity of the outer periphery of the exterior body 2 when the exterior body 2 is held by the holding plate 43, the second guide 432 guides the electrolyte to flow toward the dot portion 433. In addition, the electrolytic solution is prevented from entering from the outer peripheral edge side to the inside. Further, the dot portion does not completely prevent the electrolyte from entering from the outer periphery of the outer package, but it suppresses the intrusion and decreases the impregnation rate of the electrolyte from the outer periphery of the outer package.

  Accordingly, the rate at which the separator 13 is impregnated with the electrolytic solution from the air outlet side can be reduced, so that air can be discharged from the air outlet 60 more effectively, and the separator 13 is impregnated with the electrolytic solution. Time can be shortened.

  Further, if a guide or dot is formed on the electrode plates 11 and 12 to obtain the same effect, it is necessary to form the guide or dot for each of the electrode plates 11 and 12 and the manufacture thereof is difficult. It takes time to make. In addition, if the electrode plates 11 and 12 are formed, guides and dots may be lost. When the electrode plates 11 and 12 are formed, it is necessary to apply an active material to the guides and dot portions of the electrode plates 11 and 12, so that the electrode plates 11 and 12 need not be enlarged in order to obtain specified battery performance. must not.

  On the other hand, according to the present embodiment, such a problem is solved by forming guides and dots on the holding plate 43, and the size of the electrode plates 11 and 12 is reduced while suppressing the manufacturing cost and time. Can do.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. The second embodiment of the present invention is different from the first embodiment in the position of the protrusion formed on the holding surface of the holding plate 43. Hereinafter, the difference will be described. In each of the following embodiments, the same reference numerals are used for portions that perform the same functions as those of the first embodiment described above, and repeated descriptions are omitted as appropriate.

  FIG. 6 is a diagram schematically showing the positions of the two first guides 431 and the dot portion 433 when the exterior body 2 is held by the holding plate 43 according to the present embodiment, and the lower side in the drawing is an L-shape. This is the side of the plate 41 in contact with the bottom plate 41a.

  As shown in FIG. 6, two first guides 431 and a dot portion 433 are formed on the holding surface of the holding plate 43. In addition, when it is necessary to distinguish the two first guides 431, for convenience, among the two first guides 431, the left one in the figure is “first guide 431a”, and the right one in the figure is “ First guide 431b ”.

  The two first guides 431 are provided in a C shape so as to be line symmetric. The first guide 431 a is formed so as to extend from the center of the upper opening of the exterior body 2 to the left of the exterior body peripheral edge 21 obliquely to the left and downward when the exterior body 2 is held.

  The first guide 431b is formed so as to extend from the center of the upper opening of the exterior body 2 to the right portion of the exterior body peripheral edge 21 obliquely downward to the right when the exterior body 2 is held.

  The dot portion 433 is formed in the center of the upper opening of the exterior body 2 and between the two first guides 431.

  In this embodiment, the upper part of the two first guides 431 is the electrolyte injection port 50, and the central part of the upper opening of the exterior body 2 sandwiched between the two first guides 431 is the air discharge port 60. .

  As a result, the electrolyte injected from the electrolyte injection port 50 flows down along the two first guides 431 toward the outer periphery of the exterior body, and then passes upward through the center toward the air discharge port 60. Flowing. Therefore, the air exhaust port 60 can exhaust the internal air.

  Therefore, also in the holding plate 43 according to the present embodiment, the air existing in the separator 13 or between the separator 13 and the electrode plates 11 and 12 is guided to the air outlet 60 according to the flow of the electrolyte, and the air outlet 60 can be discharged. Therefore, since air does not accumulate in the central portion of the separator, the time for impregnation of the electrolyte into the separator 13 can be shortened.

(Third embodiment)
Next, a third embodiment of the present invention will be described. The third embodiment of the present invention is different from the first embodiment in the position of the protrusion formed on the holding surface of the holding plate 43. Hereinafter, the difference will be described.

  FIG. 7 is a diagram schematically showing the positions of the first guide 431, the second guide 432, and the dot portion 433 when the exterior body 2 is held by the holding plate 43 according to the present embodiment. This is the side in contact with the bottom plate 41 a of the L-shaped plate 41.

  As shown in FIG. 7, the first guide 431, the second guide 432, and the dot portion 433 are formed on the holding surface of the holding plate 43.

  The first guide 431 is formed to extend from the right side of the upper opening of the exterior body 2 to the central portion of the exterior body 2 diagonally to the left when holding the exterior body 2.

  The second guide 432 is formed so that when the exterior body 2 is held, the vicinity of the periphery of the exterior body 2 extends vertically from the upper opening of the exterior body 2 toward the lower portion.

  The dot portion 433 is formed in the upper opening of the exterior body 2 and between the first guide 431 and the second guide 432.

  In the present embodiment, the upper part of the first guide 431 is the electrolyte solution inlet 50, and the upper opening right part of the outer package 2 sandwiched between the first guide 431 and the second guide 432 is the air outlet 60. .

  The electrolytic solution injected from the electrolytic solution inlet 50 flows down along the first guide 431 as in the first embodiment, and then flows upward toward the air outlet 60 through the central portion. Therefore, the internal air can be discharged from the air discharge port 60.

  Further, the second guide 432 and the dot portion 433 can suppress the intrusion of the electrolytic solution from the air discharge port side.

  Therefore, the same effect as that of the first embodiment can be obtained in the holding plate 43 according to the present embodiment.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. The fourth embodiment of the present invention is different from the first embodiment in that the guide formed on the holding surface of the holding plate 43 has a dot shape. Hereinafter, the difference will be described.

  FIG. 8 is a diagram schematically showing the position of the dot portion 433 when the exterior body 2 is held by the holding plate 43 according to the present embodiment, and the lower side in the drawing is the side in contact with the bottom plate 41 a of the L-shaped plate 41. It is.

  As shown in FIG. 8, only the dot portion 433 is formed on the holding surface of the holding plate 43 according to the present embodiment.

  When the exterior body 2 is held, the dot portion 433 is formed in a band shape on the diagonal line of the exterior body 2 so as to rise to the right shoulder, and in the vicinity of the peripheral edge of the exterior body 2 from the upper opening of the exterior body 2 to the lower part. It is formed in a strip shape so as to extend vertically.

  In this embodiment, the central portion of the upper opening of the exterior body 2 is the electrolyte injection port 50, and the right side of the upper opening of the exterior body 2 is the air discharge port 60.

  Most of the electrolytic solution injected from the electrolytic solution injection port 50 flows obliquely downward to the left due to the effect of the dot portion 433 arranged on the diagonal line. Then, after flowing to the bottom of the exterior body 2, it flows in the upper right direction in the figure so as to pass through the center portion in a form guided by the dot portion 433, whereby the internal air is exhausted through the dot portion 433. It is discharged from the outlet 60.

  Moreover, the penetration of the electrolyte solution from the air discharge port side can be suppressed by the dot portions provided on the peripheral edge side of the exterior body 2.

  Therefore, the same effect as that of the first embodiment can be obtained in the holding plate 43 according to the present embodiment.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described. The fifth embodiment of the present invention is different from the first embodiment in the positions of guides and dot portions formed on the holding surface of the holding plate 43. Hereinafter, the difference will be described.

  FIG. 9 is a diagram schematically showing the positions of the first guide 431, the second guide 432, and the dot portion 433 when the exterior body 2 is held by the holding plate 43 according to the present embodiment. This is the side in contact with the bottom plate 41 a of the L-shaped plate 41.

  As shown in FIG. 9, the first guide 431, the two second guides 432, and the two dot portions 433 are formed on the holding surface of the holding plate 43 according to the present embodiment. When it is necessary to distinguish between the two second guides 432, for convenience, the left guide in the figure is the “second guide 432a” and the right guide in the figure is “ The second guide 432b ”. Similarly, of the two dot portions, the left one in the figure is “dot portion 433a”, and the right one in the drawing is “dot portion 433b”.

  The first guide 431 is formed in a belt shape so as to sandwich the upper portion of the outer periphery 21 of the exterior body when the exterior body 2 is held.

  The second guide 432a is formed in a band shape so as to sandwich the left part of the outer periphery part 21 of the outer body when the outer body 2 is held, and is formed vertically from the middle of the left part of the outer periphery part 21 to the lower part. Is done.

  The second guide 432b is formed in a band shape so as to sandwich the right part of the outer periphery of the outer body 21 when the outer body 2 is held, and is formed vertically from the middle of the right part of the outer periphery of the outer body 21 to the lower part. Is done.

  The dot portion 433a is formed between the first guide 431 and the second guide 432a while sandwiching the left portion of the outer peripheral portion 21 when the outer casing 2 is held.

  The dot part 433b is formed between the first guide 431 and the second guide 432b while sandwiching the right part of the outer peripheral part 21 when the outer body 2 is held.

  In this embodiment, the central portion of the upper opening of the outer package 2 is the electrolyte injection port 50, and the two dot portions 433 are the air discharge ports 60.

  The electrolytic solution injected from the electrolytic solution injection port 50 is guided to the left side and the right side of the outer peripheral portion 21 by the first guide 431. The electrolyte guided to the left side of the outer periphery 21 of the exterior body flows down the left side of the periphery as it is due to the effects of the dot portion 433a and the second guide 432a. In addition, the electrolyte guided to the right side of the outer peripheral edge portion 21 also flows down on the right side of the peripheral portion as it is due to the effects of the dot portion 433b and the second guide 432b.

  After flowing to the bottom of the exterior body 2, it flows into the central part and then flows upward through the central part. As a result, the internal air is discharged from the air discharge port 60 via the dot portion 433.

  In addition, the second guide 432 and the dot portion 433 can suppress the intrusion of the electrolytic solution from the air discharge port side.

  Therefore, the same effect as that of the first embodiment can be obtained in the holding plate 43 according to the present embodiment.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described. The sixth embodiment of the present invention is different from the first embodiment in the positions of guides and dot portions formed on the holding surface of the holding plate 43. Hereinafter, the difference will be described.

  FIG. 10 is a diagram schematically showing the positions of the two first guides 431 and the dot portion 433 when the exterior body 2 is held by the holding plate 43 according to the present embodiment, and the lower side in the drawing is an L-shaped plate. 41 is the side in contact with the bottom plate 41a.

  As shown in FIG. 10, two first guides 431 and a dot portion 433 are formed on the holding surface of the holding plate 43 according to the present embodiment. In addition, when it is necessary to distinguish the two first guides 431, for convenience, among the two first guides 431, the left one in the figure is “first guide 431a”, and the right one in the figure is “ First guide 431b ”.

  The first guide 431a is composed of four guides inclined diagonally to the left and the first guide 431b is composed of four guides inclined diagonally to the right. The two first guides 431 are arranged so as to be line symmetric, and are arranged so that the distance between the guides becomes wider toward the lower side.

  The dot portion 433 is formed between the central portion of the upper opening of the exterior body 2 and between the two first guides 431.

  In the present embodiment, the left and right portions of the upper opening of the outer package 2 are the electrolyte solution injection ports 50, and the central region of the upper opening of the outer package 2 including the dot portions 433 is the air discharge port 60. .

  The electrolytic solution injected from the electrolytic solution injection port 50 is guided to the left and right sides of the outer peripheral portion 21 by the first guide 431 and flows down to the bottom.

  The electrolyte that has flowed down to the bottom flows into the central portion, and then flows upward toward the dot portion 433. Thereby, the internal air can be discharged from the air discharge port 60 through the dot portion 433.

  Therefore, also in the holding plate 43 according to the present embodiment, the air existing in the separator 13 or between the separator 13 and the electrode plates 11 and 12 is guided to the air outlet 60 according to the flow of the electrolyte, and the air outlet 60 can be discharged. Therefore, since air does not accumulate in the central portion of the separator, the time for impregnation of the electrolyte into the separator 13 can be shortened.

  Note that the present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

  For example, in the above embodiments, the first guide 431 and the like are provided on the holding plate 43, but may be provided on the inner surface of the exterior body 2 and the electrode plates 11 and 12.

DESCRIPTION OF SYMBOLS 1 Battery element 2 Exterior body 4 Electrolyte injection apparatus 11 Positive electrode plate 12 Negative electrode plate 13 Separator 43 Holding plate 50 Electrolyte injection port 60 Air exhaust port 431 1st guide (high press part)
432 2nd guide (high pressing part)
433 dot part (high pressing part)

Claims (7)

An electrolyte injection device for injecting an electrolyte from an electrolyte injection port provided in a part of an opening of the exterior body while sandwiching an exterior body in which battery elements are stored and applying a surface pressure to the battery element,
A high pressing portion that partially increases the surface pressure applied to the battery element so that the injected electrolyte flows toward an air outlet provided at a position different from the electrolyte inlet of the opening of the exterior body Comprising
An electrolyte injection device characterized by the above. The high pressing portion is a protrusion formed on the surface of the holding plate that holds the exterior body.
The electrolyte solution injection device according to claim 1, wherein After guiding the electrolyte injected from the electrolyte inlet into the protrusion so as to flow down toward the peripheral edge of the exterior body, it flows toward the air outlet through the center of the exterior body. Includes band-like protrusions that guide you to go up,
The electrolyte solution injection device according to claim 2, wherein The protrusion includes a belt-like protrusion that is provided perpendicular to the peripheral edge of the exterior body and prevents the electrolyte from flowing from the peripheral edge of the exterior body toward the inside.
The electrolytic solution injecting device according to claim 2 or 3, The protrusion is provided with a dot-like protrusion that is provided in a region corresponding to the air discharge port when the exterior body is sandwiched, and that suppresses intrusion of the electrolytic solution from the air discharge port into the exterior body. included,
The electrolytic solution injecting device according to any one of claims 2 to 4, wherein the electrolytic solution injecting device is provided. The battery element is a separator disposed between a positive electrode plate and a negative electrode plate, and the exterior body stores a plurality of stacked battery elements.
The electrolyte solution injection device according to any one of claims 1 to 5, wherein An electrolyte injection method for injecting an electrolyte from an electrolyte injection port provided in a part of an opening of the exterior body while sandwiching an exterior body in which battery elements are housed and applying surface pressure to the battery element,
A high pressing step in which the surface pressure applied to the battery element is partially increased so that the injected electrolyte flows toward an air outlet provided at a position different from the electrolyte inlet of the opening of the exterior body Comprising
An electrolyte injection method characterized by the above.

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