Power storage device, method for manufacturing power storage device, and method for inspecting power storage device

Abstract

The invention relates to a power storage device, a method for manufacturing the power storage device, and a method for inspecting the power storage device. Provided is a power storage device. The present invention is provided with: a cylindrical battery; a holder for holding the cylindrical battery, the holder having an end wall facing an annular caulking part provided at one end in the axial direction of the cylindrical battery and an outer peripheral wall extending from the end wall; and a first hole provided in the end wall of the holder and penetrating in the axial direction. And a groove portion provided on the one end wall of the holder, the groove portion having a concave shape opening toward the swaging portion side, the groove portion extending along the swaging portion and communicating with the first hole portion, and a resin member disposed in at least a portion of the groove portion including the swaging portion side.

Description

Technical Field

[0001] This disclosure relates to an energy storage device, a method for manufacturing the energy storage device, and a method for inspecting the energy storage device. Background Technology

[0002] An energy storage device is known in which the energy storage unit, composed of a secondary battery or the like, is housed within a retaining member to protect it from external impacts or other disturbances. For example, Japanese Patent Application Publication No. 2015-053205 discloses a battery pack (energy storage device) having a retaining member for holding multiple cylindrical batteries.

[0003] However, in order to prevent air from entering the interior, the cylindrical battery (energy storage unit) disclosed in the above-mentioned documents, which is installed in the battery pack, is expected to maintain the airtightness of the cylindrical battery. There is room for improvement in the sealing between the cylindrical battery and the retaining member. Summary of the Invention

[0004] In view of the above facts, this disclosure provides an energy storage device, a method for manufacturing the energy storage device, and a method for inspecting the energy storage device, which can improve the sealing between the cylindrical battery and the retaining member.

[0005] The first embodiment of the present disclosure provides an energy storage device comprising a cylindrical battery; a retainer having an end wall opposite to an annular riveting portion disposed at one axial end of the cylindrical battery and an outer peripheral wall extending from the end wall, the retainer holding the cylindrical battery; a first hole provided in the end wall of the retainer and extending through in the axial direction; a groove provided in the end wall of the retainer, being a concave shape opening toward the riveting portion, extending along the riveting portion and communicating with the first hole; and a resin component disposed in the groove, including at least a portion of the riveting portion side.

[0006] In the energy storage device of the first embodiment, a first hole, which is provided on one end wall of the retainer and extends axially, communicates with a groove. This groove is a concave shape that opens towards the riveting portion and extends along the riveting portion. Furthermore, a resin component is disposed in at least a portion of the groove including the riveting portion side. Therefore, in the cylindrical battery, the riveting portion, which requires greater sealing, can be sealed with the resin component, thus improving the sealing performance between the cylindrical battery and the retainer.

[0007] Regarding the energy storage device of the second aspect of this disclosure, in the structure of the first aspect, the resin component is disposed in at least a portion of the first hole.

[0008] In the energy storage device of the second embodiment, the resin component is disposed in at least a portion of the first hole, so when the resin component is disposed from the first hole into the groove, it is possible to confirm that the resin component is disposed in the groove communicating with the first hole.

[0009] Regarding the energy storage device of the third embodiment of this disclosure, in the structure of the above embodiment, the outer peripheral wall is provided with a gap between it and the outer peripheral surface of the cylindrical battery in the circumferential direction, and the energy storage device further includes a communication path that connects the gap with the slot.

[0010] In the energy storage device of the third embodiment, a connecting path is provided, which connects the gap between the outer peripheral wall of the retainer and the outer peripheral surface of the cylindrical battery with the groove. Therefore, when the resin component is disposed in the groove, by checking the resin component flowing into the gap via the connecting path, it is possible to confirm that the resin component is disposed in the groove.

[0011] Regarding the energy storage device of the fourth embodiment of this disclosure, in the structure of any of the above embodiments, a discharge valve is provided at one end of the cylindrical battery, and the groove portion is configured separately from the discharge valve when viewed from the axial direction.

[0012] In the energy storage device of the fourth scheme, the tank and the discharge valve are configured separately, so the sealing performance can be improved without hindering the opening of the discharge valve.

[0013] Regarding the energy storage device of the fifth embodiment of this disclosure, in the fourth embodiment, a second hole is provided, which is disposed on one end wall of the retainer and is arranged facing the discharge valve.

[0014] In a retainer that holds multiple cylindrical batteries and has a second hole on one end wall of the retainer facing the discharge valve, a tighter seal between adjacent cylindrical batteries is required. In the energy storage device of the fifth embodiment, the retainer has a second hole on one end wall facing the discharge valve, but a resin component is disposed on at least a portion of the groove including the riveting portion. Therefore, in the cylindrical batteries, the resin component can seal the riveting portion, which requires a tighter seal, thereby improving the seal between the cylindrical batteries and the retainer, and thus also improving the seal between adjacent cylindrical batteries.

[0015] Regarding the energy storage device of the sixth embodiment of this disclosure, in the structure of any of the above embodiments, an elastic member is further provided, which is disposed on the cylindrical battery side of one end wall of the retainer and is provided with the groove, and the Young's modulus of the elastic member is smaller than that of the retainer.

[0016] In the energy storage device of the sixth embodiment, the Young's modulus of the elastic member in the groove is smaller than that of the retainer. Therefore, by absorbing the manufacturing tolerances of the cylindrical battery and the retainer by the elastic member, it is possible to suppress the excessive leakage of resin components from the groove.

[0017] Regarding the energy storage device of the seventh embodiment of this disclosure, in the structure of any of the above embodiments, a plurality of the first holes are provided on the end wall of the retainer.

[0018] In the energy storage device of the seventh embodiment, one end wall of the retainer has a plurality of first holes. Therefore, when the resin component is disposed in the tank, by checking the resin component flowing out from the first holes other than the first holes that serve as the injection port of the resin component, it is possible to confirm that the resin component is disposed in the tank.

[0019] Regarding the energy storage device of the eighth embodiment of this disclosure, in the structure of the above-described embodiment including the third embodiment, the connecting path includes a first portion, which is formed such that the height of the axial direction is higher than the height of the connecting path on the side of the first hole.

[0020] In the energy storage device of the eighth embodiment, the connecting path includes a first portion, which is formed such that its axial height is higher than that of the connecting path on the first orifice side. Therefore, the pressure when the resin component flows into the first portion is lower than that on the first orifice side. Consequently, when the resin component is injected from the first orifice, it can be easily allowed to flow out.

[0021] Regarding the energy storage device of the ninth aspect of this disclosure, in the structure of the above-described aspect including the third aspect, the resin component is arranged to extend from the tank portion to the communication path.

[0022] In the energy storage device of the ninth embodiment, the resin component is arranged to extend into the communication path, thereby improving the tightness between the resin component and the retaining member, as well as between the resin component and the cylindrical battery, and improving the sealing performance.

[0023] The tenth aspect of this disclosure is a method for manufacturing an energy storage device according to any of the above-described aspects, wherein the retainer is divided in the axial direction, one end retainer having the one end wall of the divided retainer is installed on the positive electrode side of the cylindrical battery, the resin component is injected into the groove through the first hole, the resin component flowing into the gap is detected from the side opposite to the one end wall, and the injection of the resin component from the first hole is stopped when the amount of resin component flowing into the gap reaches a predetermined amount.

[0024] In the manufacturing method of the tenth embodiment, a resin component is injected into the groove through the first hole. The amount of resin component flowing into the gap is detected from the side opposite to one end wall. When the amount of resin component flowing into the gap reaches a predetermined amount, the injection of resin component from the first hole is stopped. Therefore, by detecting the amount of resin component flowing into the gap, it is possible to confirm that a resin component is disposed in the groove, thus making it easier to identify manufacturing defects. In addition, compared to filling the entire gap with resin component, a smaller amount of resin component can be used to seal the riveting part, thereby improving the sealing performance between the cylindrical battery and the retainer, and suppressing the increase in weight of the energy storage device.

[0025] Regarding the 11th aspect of this disclosure, in the manufacturing method of the 10th aspect, the injection of the resin component is performed with one end wall located on the lower side in the vertical direction.

[0026] In the manufacturing method of the 11th scheme, the resin component is injected with one end wall located on the lower side in the vertical direction, so the subsequent inspection process can be carried out more smoothly.

[0027] Regarding the 12th aspect of this disclosure, in the manufacturing method of the above-described aspect, the detection of the resin component flowing into the gap is performed on the side opposite to the first hole, which is on the axis clamping the cylindrical battery.

[0028] In the manufacturing method of the 12th embodiment, the detection of the resin component flowing into the gap is performed on the side opposite to the first hole, which is the axis clamping the cylindrical battery. Therefore, the resin component can be detected on a side farther away from the first hole where the resin component is injected. Thus, it is possible to more reliably detect the situation where the resin component spreads throughout the entire tank.

[0029] The 13th aspect of this disclosure is an inspection method for inspecting the case where the resin component is disposed in the tank in an energy storage device of any of the above aspects, wherein, when the resin component is injected into the tank from the first hole, the resin component flowing into the gap is detected from the side opposite to the end wall.

[0030] In the inspection method of the 13th embodiment, when the resin component is injected into the groove through the first hole, the resin component flowing into the gap is detected from the side opposite to one end wall. Therefore, by detecting the resin component flowing into the gap, it is possible to confirm that a resin component is disposed in the groove, thus making it easier to identify manufacturing defects. In addition, compared to filling the entire gap with resin component, less resin component can be used to seal the riveting part, thus improving the sealing performance between the cylindrical battery and the retainer, and suppressing the increase in weight of the energy storage device.

[0031] Regarding the 14th aspect of this disclosure, in the inspection method of the 13th aspect, the detection of the resin component flowing into the gap is based on an image obtained by photographing the gap.

[0032] In the inspection method of the 14th scheme, the resin component flowing into the gap is detected based on the image obtained by shooting the gap. Therefore, if the resin component is reflected in the image, it can be confirmed that a resin component is disposed in the gap.

[0033] Regarding the 15th aspect of this disclosure, in the inspection method of the above aspect, the detection of the resin component flowing into the gap is performed by measuring the displacement in the gap.

[0034] In the inspection method of the 15th scheme, the flow of resin components into the gap is detected by measuring the displacement in the gap. Therefore, if the displacement in the gap changes, it can be confirmed that resin components have flowed into the gap. In addition, by measuring the amount of displacement, the amount of resin components flowing into the gap can be detected.

[0035] Regarding the 16th aspect of this disclosure, in the inspection method of the above aspect, the detection of the resin component flowing into the gap is performed with one end wall located on the lower side in the vertical direction.

[0036] In the inspection method of the 16th scheme, the detection of resin components flowing into the gap is performed with one end wall positioned at the lower side in the vertical direction. Therefore, it is possible to detect resin components flowing into the gap from the upper side, thus improving operability.

[0037] Regarding the 17th aspect of this disclosure, in the inspection method of the above aspect, the detection of the resin component flowing into the gap is performed on the side opposite to the first hole, which is on the axis clamping the cylindrical battery.

[0038] In the inspection method of the 17th embodiment, the detection of the resin component flowing into the gap is performed on the side opposite to the first hole, which is on the axis clamping the cylindrical battery. Therefore, the resin component can be detected on a side farther away from the first hole where the resin component is injected. Thus, it is possible to more reliably detect situations where the resin component has spread throughout the entire tank.

[0039] As explained above, the energy storage device, manufacturing method, and inspection method disclosed herein can improve the sealing performance between the cylindrical battery and the retaining element. Attached Figure Description

[0040] Figure 1 This is a schematic top view showing an example of the holding member of the energy storage device according to the first embodiment of the present disclosure.

[0041] Figure 2 yes Figure 1 A schematic cross-sectional view of the energy storage device at the AA line of the retainer.

[0042] Figure 3 It is shown Figure 2 A schematic cross-sectional view of a modified example of an energy storage device.

[0043] Figure 4 It is shown Figure 2 The dashed line shows a schematic cross-sectional view of an example containing the range of the energy storage unit.

[0044] Figure 5 Yes Figure 4 An enlarged sectional view obtained by enlarging a portion of it.

[0045] Figure 6 This is a flowchart illustrating an example of a method for manufacturing an energy storage device.

[0046] Figure 7 This is a schematic cross-sectional view used to illustrate the injection method of the resin component.

[0047] Figure 8 This is a schematic cross-sectional view used to illustrate the inspection method for resin components.

[0048] Figure 9 This is an enlarged cross-sectional view obtained by enlarging a portion of the energy storage device including the energy storage unit according to the second embodiment of the present disclosure.

[0049] Figure 10 Viewed from the battery storage unit side Figure 9 A schematic bottom view of the elastic components used in the energy storage device.

[0050] Figure 11 It is used for explanation Figure 9 A schematic cross-sectional view of the injection and inspection methods for resin components in an energy storage device. Detailed Implementation

[0051] Hereinafter, with reference to the accompanying drawings, various embodiments for implementing this disclosure will be described. Furthermore, the scope of the description necessary to achieve the objectives of this disclosure will be schematically shown below, primarily focusing on the scope necessary for the description of corresponding parts of this disclosure; any omitted descriptions are considered to be based on prior art. Additionally, identical or equivalent components in the figures will be given the same or similar symbols, and repetitive descriptions will be omitted. Furthermore, in cases where multiple identical or equivalent components are included in the figures, sometimes only some of them will be indicated with symbols for ease of reading the drawings.

[0052] <First Embodiment>

[0053] Figure 1 This is a schematic top view illustrating an example of the holding member 30 of the energy storage device 1 according to the first embodiment of this disclosure. Additionally, Figure 2 yes Figure 1 A schematic cross-sectional view of the energy storage device 1 at the AA line of the retainer 30. Figure 3 It is shown Figure 2 A schematic cross-sectional view of a modified example of the energy storage device 1. Figure 4 It is shown Figure 2 The dashed lines indicate a schematic cross-sectional view of an example encompassing the extent of a cylindrical battery. Additionally, Figure 5 Yes Figure 4 An enlarged cross-sectional view obtained by magnifying a portion of the image. As an example, the energy storage device 1 of the first embodiment is used in electric bicycles and electric vehicles, etc. Figure 1 and Figure 2 As shown, as an example, the energy storage device 1 includes a plurality of energy storage units 10 as cylindrical batteries and a holding member 30 for holding the plurality of energy storage units 10. Furthermore, in the following description, it will sometimes be referred to as... Figure 2 The direction of the arrow X shown is referred to as the width direction or the lateral direction, and sometimes the direction of the arrow Y (axial direction) is referred to as the vertical direction or the height direction. Furthermore, in this embodiment, the positive side of the arrow Y corresponds to one end (the first side), and the negative side corresponds to the other end (the second side). For ease of explanation, the positive side of the arrow Y is described as the upper side, and the negative side as the lower side.

[0054] The energy storage unit 10 in this embodiment can be constructed from a battery containing an electrolyte, such as a lithium-ion battery. Figure 4 As shown, the energy storage unit 10 includes at least an electrode body 11, a frame 12 that houses the electrode body 11 and the electrolyte, and a plate-shaped member 13 that at least partially blocks the opening of the frame 12. Furthermore, in this embodiment, the energy storage unit 10 is shown as containing an electrolyte component, but the energy storage unit may also not contain any liquid.

[0055] The electrode body 11 can be, for example, a wound electrode body. This electrode body 11 can have a structure obtained by winding the positive electrode 14 and the negative electrode 15 with the strip-shaped separator 16 positioned between the same strip-shaped positive electrode 14 and negative electrode 15. As the positive electrode 14, metals such as cobalt, nickel, manganese, or iron phosphate-based materials can be used alone or in combination. Furthermore, as the negative electrode 15, carbon-based materials or other alloys can be used. Further, as the separator 16, a porous sheet material with ion-permeable and insulating properties can be used; for example, polyolefin resins containing polyethylene or polypropylene, cellulose, etc., can be used.

[0056] Furthermore, the electrolyte sealed inside the energy storage unit 10 can be an organic solvent such as ethylene carbonate, dimethyl carbonate, or diethyl carbonate, which contains dissolved lithium electrolyte salts. In addition, the materials, shapes, and types of electrolytes of the various structural elements constituting the electrode body 11 can be appropriately selected and adopted based on the intended use of the energy storage device 1.

[0057] An upper insulating plate 17 and a lower insulating plate 18 are respectively provided at the upper and lower parts of the electrode body 11. The upper insulating plate 17, for example... Figure 5 As shown, a positive lead 19 is provided, one end of which is electrically connected to the middle portion of the positive electrode 14 in the winding direction. Furthermore, a through hole (not shown) may be provided on the upper insulating plate 17 for inserting the positive lead 19. Additionally, the other end of the positive lead 19 can be electrically connected to the terminal plate 21 described later.

[0058] The frame 12 can be constructed from an outer can made of a bottomed cylindrical metal container. An opening 12A is provided at the top of the frame 12, which is blocked by a plate-like component 13 after the electrode body 11 and electrolyte are inserted. Furthermore, the frame 12 can function as a negative terminal electrically connected to the negative electrode 15 by a negative electrode lead (not shown) connected to the end of the wound negative electrode 15 or a suitable location on the negative electrode 15. The frame 12 can be manufactured by forming a bottomed cylindrical shape from a metal sheet through deep drawing or similar processes.

[0059] The plate-shaped component 13 can be constructed by sealing the opening 12A of the frame 12. The plate-shaped component 13 of this embodiment includes a terminal plate 21 on which the other end of the positive lead 19 is mounted by welding or the like, a valve 22 which is disposed opposite to the terminal plate 21 as a discharge valve, and an insulating plate 23 located between the terminal plate 21 and the valve 22.

[0060] The terminal block 21 can be constructed from a generally disc-shaped plate made of metal such as stainless steel (SUS), aluminum, or aluminum alloy. The central portion 21A of the terminal block 21 has a thinner wall than other portions, and the central portion of the valve 22 is joined to the upper surface of this central portion 21A by welding or bonding with an adhesive. Furthermore, a plurality of vents 21B are provided at positions on the terminal block 21 that are radially separated from the central portion 21A by a predetermined distance.

[0061] Valve 22 can be constructed from a generally disc-shaped plate with a diameter larger than that of terminal plate 21. Valve 22 can be manufactured by stamping sheet metal such as stainless steel (SUS), aluminum, or aluminum alloy. If stainless steel, aluminum, or aluminum alloy is used as valve 22, it can share the same material as terminal plate 21, and the valve 22 and terminal plate 21 can be easily joined by welding or other means.

[0062] Furthermore, the valve 22 in this embodiment has a different wall thickness in the radial direction. Specifically, a thin-walled portion 22C is provided so as to connect the radial central portion 22A of the valve 22 to the outer peripheral portion 22B. In addition, the lower surface of the central portion 22A of the valve 22 is convex downward in order to facilitate engagement with the central portion 21A of the terminal plate 21. Furthermore, one or more support walls 22D supporting the outer edge of the insulating plate 23 are provided on the lower surface of the outer peripheral portion 22B.

[0063] The insulating plate 23 can be constructed from a generally annular plate with a through hole in the center. The insulating plate 23 is disposed such that it is sandwiched between the upper surface of the terminal plate 21 and the lower surface of the valve 22. At the outer edge of the insulating plate 23, one or more support walls 23A extending downwards to support the outer edge of the terminal plate 21 are provided. By supporting the terminal plate 21 with the support walls 23A of the insulating plate 23, the terminal plate 21 and the valve 22 can be easily positioned. Furthermore, multiple vents 23B are provided on the insulating plate 23, so that the vents 21B of the terminal plate 21 communicate with the thin-walled portion 22C of the valve 22.

[0064] When the pressure inside the frame 12 rises, the valve 22 presses down on the thin-walled portion 22C and reverses it, thus functioning as a so-called explosion-proof valve to prevent damage to the frame 12. At this time, the central portion 22A of the engaged valve 22 is physically separated from the central portion 21A of the terminal plate 21, thereby forcibly cutting off the current supplied from the energy storage unit 10.

[0065] The energy storage unit 10 is sealed by riveting the edge of the plate-shaped member 13, which includes the above-described structure, to the opening 12A via the riveting part F1. Therefore, an example of the construction of the riveting part F1 will be described below.

[0066] A riveting part F1 is annularly disposed at one end of the energy storage unit 10 in the axial (height direction), specifically at the opening 12A of the frame 12, and is riveted and fixed between the valve 22, which is an example of the edge of the plate-shaped member 13, via a washer 26. After the riveting part F1 is bent into a shape surrounding the outer periphery 22B of the valve 22, it can be clamped and riveted from above and below using a pressing device (not shown). In this embodiment, the upper front end of the washer 26 and the upper front end of the frame 12 are pressed downwards, so that it is located axially lower than the circumferentially outer side. The washer 26 functions as a sealing member for maintaining the airtightness of the energy storage unit 10. Furthermore, the washer 26 also functions to electrically insulate the frame 12 from the terminal plate 21. Relatedly, the washer 26 can be made of a relatively soft insulating material such as synthetic resin.

[0067] Between the opening 12A in the height direction of the frame 12 and the receiving position of the upper insulating plate 17, an annular recess 12B is provided all around the circumference of the frame 12, recessed inward. This annular recess 12B supports the electrode body 11 and the like housed within the frame 12. Furthermore, the upper surface of this annular recess 12B functions as a mounting surface for the outer peripheral portion 22B of the valve 22, which is mounted with a gasket 26 in between.

[0068] The opening 12A is bent with the washer 26 positioned therebetween, to surround the lower, side, and upper surfaces of the outer periphery 22B of the valve 22, which is mounted on the upper surface of the annular recess 12B. Then, pressure is applied from above and below using a pressure device (not shown), thereby... Figure 4 and Figure 5 As shown, the outer periphery 22B of the gasket 26 and the valve 22 is riveted and fixed to the inside of the opening 12A. The riveting part F1, by placing the gasket 26 between the frame 12 and the valve 22, ensures the airtightness of this part while also achieving insulation between the frame 12 and the valve 22.

[0069] The retaining member 30 internally houses and holds multiple energy storage units 10 of the above-described structure, and can be made of an insulating material such as resin. Figure 2 and Figure 4 As shown, the retaining member 30 in this embodiment is composed of an upper retaining member 31 that houses the positive electrode side of the energy storage unit 10 and a lower retaining member 32 that houses the negative electrode side of the energy storage unit 10. Furthermore, in Figure 4 In the diagram, one upper retainer 31 and one lower retainer 32 are each shown, but as an example, such as Figure 2 As shown, the retainer 30 of this embodiment is constructed by connecting multiple upper retainers 31 or lower retainers 32 in the horizontal and vertical directions. In addition, in this embodiment, the upper retainers 31 and lower retainers 32 are shown separately in the vertical direction, but the upper retainers 31 and lower retainers 32 will eventually be joined together by adhesive, fastening components or the like.

[0070] Furthermore, in this embodiment, regarding the energy storage device 1, the upper retaining member 31 houses the positive electrode side of the energy storage unit 10, and the lower retaining member 32 houses the negative electrode side of the energy storage unit 10. Additionally, in the energy storage device 1 of this embodiment, all energy storage units 10 are arranged with the positive electrode side on top and the negative electrode side on the bottom, and all energy storage units 10 are connected in parallel; however, this disclosure is not limited to this. For example, to increase the voltage, some of the energy storage units 10 may be connected in series. Specifically, as... Figure 3As shown, as an example, it can also be configured such that every two energy storage units 10, the positive side becomes the lower side and the negative side becomes the upper side; in other words, every two energy storage units 10, the orientation of the positive terminal is reversed. In this case, the energy storage units 10 housing the positive terminal side and the energy storage units 10 housing the negative terminal side are mixed together at the upper retaining member 31, and the energy storage units 10 housing the positive terminal side and the energy storage units 10 housing the negative terminal side are also mixed together at the lower retaining member 32.

[0071] like Figure 4 As shown, the upper retainer 31 and the lower retainer 32 include cover portions 33 and 34 that protect the energy storage unit 10 by abutting against the upper or lower surface of the energy storage unit 10, and peripheral wall portions 35 and 36 that extend from the outer periphery of the cover portions 33 and 34 along the height direction and surround the outer periphery of the energy storage unit 10 as peripheral walls. The cover portions 33 and 34 can be constructed as generally disc-shaped components with through holes 37 and 38 at their center for inserting the positive or negative busbar lead 53 (described later). Furthermore, the lower surface of the cover portion 33 forms a support surface 33A for supporting the plate-shaped component 13. Further, the upper surface of the cover portion 34 forms a support surface 34A for supporting the bottom of the frame 12.

[0072] The peripheral wall portions 35 and 36 are generally cylindrical components, and the diameter of their inner peripheral surfaces is adjusted to be larger than the outer diameter of the energy storage unit 10 housed in the retainer 30. In other words, the peripheral wall portions 35 and 36 are provided with a gap D1 between them and the outer peripheral surface of the energy storage unit 10. The length of the peripheral wall portions 35 and 36 along the height direction is adjusted to such that when the energy storage unit 10 is housed in the retainer 30, their front ends are positioned opposite each other with a slight gap.

[0073] A positive busbar 51 is mounted on the upper surface of the cover 33 of the upper retainer 31. The positive busbar 51 is electrically connected to the positive terminal of the energy storage unit 10 via a positive busbar lead 53, specifically, to the valve 22 connected to the terminal plate 21. Similarly, a negative busbar 52 is mounted on the lower surface of the cover 34 of the lower retainer 32. The negative busbar 52 is electrically connected to the negative terminal of the energy storage unit 10 via a negative busbar lead 54, specifically, to the frame 12.

[0074] In the energy storage unit 10 containing the above-described structure, slight leakage may sometimes occur, for example, due to pressure rise within the housing 12 or impacts from the outside. Furthermore, most of the aforementioned leakage occurs around the riveted portion F1. Therefore, improving the seal between the energy storage unit 10 and the upper retaining member 31 constituting the retaining member 30 is important in preventing leakage. Considering this, the energy storage device 1 of this embodiment employs a leak-proof structure for the upper retaining member 31. This leak-proof structure will now be described.

[0075] The cover portion 33 of the aforementioned retaining member 31 is opposite to the annular riveting portion F1, corresponding to one end wall of this disclosure. At the cover portion 33, as... Figures 1-5 As shown, a first hole 40 extending through the axial direction is provided. The first hole 40 is disposed with a gap on the outer periphery of the through hole 37, which is a second hole disposed facing the valve 22. Specifically, the first hole 40 is provided at approximately the center of the circumferential direction of the outer periphery of the through hole 37 of the cover 33.

[0076] Additionally, at the cover portion 33 of the upper retainer 31, such as Figure 4 and Figure 5 As shown, a groove 41 is provided, which is a concave shape that opens towards the riveting portion F1 and extends along the annular riveting portion F1. That is, the groove 41 is formed in an annular shape and is disposed separately from the valve 22 when viewed axially. In addition, as an example, the groove 41 is formed with a groove width larger than the diameter of the first hole portion 40, and the groove 41 communicates with the first hole portion 40.

[0077] In addition, such as Figure 4 and Figure 5 As shown, the upper retainer 31 has a communication path 42 that connects the groove 41 to the gap D1. The communication path 42 extends from the circumferential outer side of the annular groove 41 toward the gap D1. Figure 5 As shown, the height H1 of the connecting path 42 is higher than the height H2 of the connecting path 42 on the side of the first hole portion 40. In this embodiment, the connecting path 42 formed according to the height H1 is designated as the first portion 42A. In this embodiment, as an example, the connecting path 42 is provided in a ring shape on the outer periphery of the groove portion 41. Furthermore, the connecting path 42 may, for example, be provided in a way that separates the first portion 42A from the portion other than the first portion 42A. In this case, holes for injecting the resin component 50 (described later) are provided in both the first portion 42A and the portion other than the first portion 42A.

[0078] Then, a resin component 50, such as a synthetic resin, is disposed in the groove 41 constructed as described above, functioning as a sealing member. The resin component 50 uses a hardened resin or the like. In this embodiment, as an example, the resin component 50 is disposed throughout the entire groove 41, extending from the groove 41 to the communication path 42. In addition, the resin component 50 is also disposed in a portion of the upper end side of the gap D1. Furthermore, the resin component 50 is disposed in a manner that seals the contact area between the upper front end of the frame 12 and the outer periphery 22B of the valve 22, which is separated by a gasket 26, at a location where leakage is highly likely to occur in the riveting part F1. That is, as long as the resin component 50 is disposed in a manner that seals the aforementioned contact area, in other words, as long as it is disposed in the area of ​​the groove 41 including the riveting part F1 side, the resin component 50 may not be disposed on the bottom side of the groove 41 other than the area including the riveting part F1 side.

[0079] Next, the manufacturing method of the above-mentioned energy storage device 1 and the inspection method for inspecting the case in which the resin component 50 is arranged in the tank 41 of the above-mentioned energy storage device 1 will be described. Figure 6 This is a flowchart illustrating an example of a method for manufacturing the energy storage device 1. Figure 7 This is a schematic cross-sectional view used to illustrate the injection method of the resin component 50. Figure 8 This is a schematic cross-sectional view used to illustrate the inspection method for resin component 50.

[0080] like Figure 6 As shown, firstly, in step S1, the retaining member 30 is divided into an upper retaining member 31 and a lower retaining member 32. Next, in step S2, the upper retaining member 31 is installed on the positive terminal side of the energy storage unit 10, i.e., the side where the valve 22 is located. In step S3, the vertical position of the energy storage unit 10 with the upper retaining member 31 installed is reversed. Specifically, as... Figure 7 As shown, the energy storage unit 10, on which the upper retainer 31 is mounted, is reversed so that the cover 33 of the upper retainer 31 is located on the lower side in the vertical direction.

[0081] In step S4, the injection of resin component 50 begins. Specifically, as follows: Figure 7 As shown, for example, using a dispenser 60, resin component 50 is injected from the first hole 40 to fill the groove 41 with resin component 50.

[0082] In step S5, an inspection is performed on the case where the resin component 50 is disposed in the tank 41. In this embodiment, as an example, such as... Figure 8As shown, the presence of resin component 50 in the groove 41 is confirmed by detecting the resin component 50 flowing into the gap D1. Specifically, the resin component 50 is detected from the side opposite to the first hole 40, on the side of the shaft that clamps the energy storage unit 10. The detection of the resin component 50 can also be performed by capturing an image of the gap D1 using an imaging device 70, such as a camera, and determining whether the resin component 50 has flowed into the gap D1 based on the captured image. In this case, the captured image can be either a still image or a moving image. Furthermore, based on the captured image, when the resin component 50 has flowed into the gap D1 and the amount of resin component 50 injected from the first hole 40 reaches a predetermined amount, the contact portion of the aforementioned riveting part F1 is blocked with the resin component 50.

[0083] Alternatively, the resin component 50 can be detected by using a displacement measuring device 80, such as a laser displacement meter, to determine whether the resin component 50 has flowed into the gap D1. In this case, the displacement measuring device 80 can also determine whether the resin component 50 flowing into the gap D1 has reached a predetermined height position. Furthermore, the aforementioned height position is set to be higher than the contact portion of the rivet F1 on the side opposite to the cover 33. Thus, when the resin component 50 reaches the aforementioned position, the contact portion of the rivet F1 is blocked with the resin component 50.

[0084] Return to Figure 6 If the inspection of resin component 50 is not completed in step S6 (step S6: "No"), the inspection of resin component 50 continues until the inspection is completed. On the other hand, if the inspection of resin component 50 is completed in step S6 (step S6: "Yes"), the injection of resin component 50 is stopped in step S7. Here, the determination of whether the inspection of resin component 50 is completed in step S6 is based on whether the injected resin component 50 has reached a predetermined amount.

[0085] Next, in step S8, the vertical position of the energy storage unit 10, on which the upper retainer 31 is mounted, is reversed. Specifically, as follows... Figure 7 As shown, the cover 33 of the upper retainer 31 is reversed from its lower position in the vertical direction, as... Figure 4 As shown, the cover portion 33 of the upper retainer 31 is positioned on the upper side in the vertical direction.

[0086] Then, in step S9, the lower retainer 32 is installed on the negative side of the energy storage unit 10, that is, the side without valve 22, and the upper retainer 31 and the lower retainer 32 are fixed together with fixing units (not shown) such as bolts. Finally, in step S10, if the positive bus 51 and the negative bus 52 are fixed to the upper retainer 31 and the lower retainer 32 by welding or the like, the assembly (manufacturing) of the energy storage device 1 is completed.

[0087] Next, the effects of the energy storage device 1 in the first embodiment will be explained.

[0088] In the energy storage device 1 of the first embodiment, a first hole 40, which is provided in the cover portion 33 of the upper retainer 31 of the retainer 30 and extends through it in the axial direction, communicates with a groove 41. The groove 41 is a concave shape that opens toward the riveting portion F1 and extends along the riveting portion F1. Then, a resin component 50 is disposed in at least a portion of the groove 41 including the riveting portion F1. Therefore, in the energy storage unit 10, the resin component 50 can be used to seal the riveting portion F1, which requires greater sealing, thereby improving the sealing performance between the energy storage unit 10 and the retainer 30.

[0089] Furthermore, in the energy storage device 1 of the first embodiment, a communication path 42 is provided, which connects the gap D1 provided between the peripheral wall portion 35 of the upper retainer 31 and the outer peripheral surface of the energy storage unit 10 to the tank portion 41. Therefore, when the resin component 50 is disposed in the tank portion 41, by checking the resin component 50 flowing into the gap D1 via the communication path 42, it is possible to confirm that the resin component 50 is disposed in the tank portion 41.

[0090] Furthermore, in the energy storage device 1 of the first embodiment, the tank 41 is arranged separately from the valve 22, so the sealing performance can be improved without hindering the valve 22 from opening.

[0091] Furthermore, in the case where the retaining member 30 holds multiple energy storage units 10 as in the energy storage device 1 of the first embodiment, and the cover portion 33 of the upper retaining member 31 has a through hole 37 disposed facing the valve 22, the sealing between adjacent energy storage units 10 is even more necessary. In the energy storage device 1 of the first embodiment, the cover portion 33 of the upper retaining member 31 has a through hole 37 disposed facing the valve 22, but the resin component 50 is disposed in at least a portion of the groove portion 41 including the riveting portion F1. Therefore, in the energy storage unit 10, the resin component 50 can be used to seal the riveting portion F1, which requires a higher degree of sealing, thereby improving the sealing between the energy storage unit 10 and the retaining member 30, and thus also improving the sealing between adjacent energy storage units 10.

[0092] Furthermore, in the energy storage device 1 of the first embodiment, the connecting path 42 includes a first portion 42A, which is formed with an axial height higher than that of the connecting path 42 on the first hole 40 side. Therefore, in the first portion 42A, the pressure when the resin component 50 flows in is lower compared to the first hole 40 side. Thus, when the resin component 50 is injected from the first hole 40, the resin component 50 can flow out more easily.

[0093] Furthermore, in the energy storage device 1 of the first embodiment, the resin component 50 is arranged to extend to the communication path 42, so the tightness between the resin component 50 and the retainer 30 and between the resin component 50 and the energy storage unit 10 can be improved, and the sealing performance can be improved.

[0094] In the manufacturing method of the energy storage device 1 according to the first embodiment, resin component 50 is injected into the groove 41 through the first hole 40, and the amount of resin component 50 flowing into the gap D1 is detected from the side opposite to the cover 33. Then, when the amount of resin component 50 flowing into the gap D1 reaches a predetermined amount, the injection of resin component 50 from the first hole 40 is stopped. Therefore, by detecting the amount of resin component 50 flowing into the gap D1, it is possible to confirm that the resin component 50 is disposed in the groove 41, so it is easier to identify manufacturing defects. In addition, compared with filling the entire gap D1 with resin component 50, less resin component 50 can be used to seal the riveting part F1, so the sealing between the energy storage unit 10 and the retaining member 30 can be improved, and the increase in weight of the energy storage device 1 can be suppressed.

[0095] Furthermore, in the manufacturing method of the energy storage device 1 in the first embodiment, the resin component 50 is injected with the cover 33 located on the lower side in the vertical direction, so the subsequent inspection process can be carried out more smoothly.

[0096] Furthermore, in the manufacturing method of the energy storage device 1 according to the first embodiment, the detection of the resin component 50 flowing into the gap D1 is performed on the side opposite to the first hole 40, which is the axis that clamps the energy storage unit 10. Therefore, the detection of the resin component 50 can be performed on a side farther away from the first hole 40 where the resin component 50 is injected. Thus, it is possible to more reliably detect the situation where the resin component 50 spreads to the entire tank 41.

[0097] In the energy storage device 1 of the first embodiment, in the inspection method for checking the case where the resin component 50 is arranged in the tank 41, when the resin component 50 is injected into the tank 41 through the first hole 40, the resin component 50 flowing into the gap D1 is detected from the side opposite to the cover 33. Therefore, by detecting the resin component 50 flowing into the gap D1, it is possible to confirm that the resin component 50 is arranged in the tank 41, so it is easier to identify manufacturing defects. In addition, compared with filling the entire gap D1 with the resin component 50, less resin component 50 can be used to seal the riveting part F1, so the sealing between the energy storage unit 10 and the retaining member 30 can be improved, and the increase in weight of the energy storage device 1 can be suppressed.

[0098] Furthermore, in the energy storage device 1 of the first embodiment, in the inspection method for checking the case where a resin component 50 is disposed in the tank 41, the resin component 50 flowing into the gap D1 can be detected based on the captured image obtained by capturing the gap D1. Therefore, if the resin component 50 is reflected in the captured image, it can be confirmed that a resin component is disposed in the gap D1.

[0099] Furthermore, in the energy storage device 1 of the first embodiment, during the inspection method for checking the case where the resin component 50 is disposed in the tank 41, the flow of the resin component 50 into the gap D1 can be detected by measuring the displacement in the gap D1. Therefore, if the displacement in the gap D1 changes, it can be confirmed that the resin component 50 has flowed into the gap D1. In addition, by measuring the amount of displacement, the amount of resin component 50 flowing into the gap D1 can be detected.

[0100] Furthermore, in the energy storage device 1 of the first embodiment, during the inspection method for checking the case where the resin component 50 is disposed in the tank 41, the detection of the resin component 50 flowing into the gap D1 is performed with the cover 33 positioned at the lower side in the vertical direction. Therefore, the resin component 50 flowing into the gap D1 can be detected from the upper side, thus improving operability.

[0101] Furthermore, in the energy storage device 1 of the first embodiment, during the inspection method for checking the case where the resin component 50 is disposed in the tank 41, the detection of the resin component 50 flowing into the gap D1 is performed on the side opposite to the first hole 40, which is the axis clamping the energy storage unit 10. Therefore, the resin component 50 can be detected on a side farther away from the first hole 40 where the resin component 50 is injected. Thus, it is possible to more reliably detect the case where the resin component 50 has spread throughout the entire tank 41.

[0102] <Second Implementation>

[0103] In the energy storage device 1 of the first embodiment described above, a first hole 40 communicating with the tank 41 is provided. In contrast, the energy storage device 1A of the second embodiment has two first holes 40A and 40B communicating with the tank 41A. Figure 9 This is an enlarged cross-sectional view obtained by enlarging a portion of the energy storage device 1A including the energy storage unit 10 according to the second embodiment of this disclosure. Figure 10 Viewed from the side of energy storage unit 10 Figure 9 A schematic bottom view of the elastic component 90 used in the energy storage device 1A. Furthermore, in Figure 9 In this text, structures that are the same as those in the first embodiment described above are indicated by the same symbols, and their descriptions are omitted here.

[0104] like Figure 9 As shown, the energy storage device 1A of this embodiment does not have a groove 41 at the cover 33, but an elastic member 90 with a groove 41A is provided on the side of the energy storage unit 10 of the cover 33. Specifically, the elastic member 90 is provided between the upper outer periphery where the riveting part F1 of the energy storage unit 10 is located and the cover 33.

[0105] As the elastic member 90, an annular component with a predetermined wall thickness can be used, and a soft material with sealing function, such as synthetic resin, can be used. One side of the elastic member 90, for example, the lower surface, abuts against the inner portion of the riveting part F1 and the surface of the plate-shaped member 13 adjacent to the riveting part F1, and the other side of the elastic member 90 opposite to one side, for example, the upper surface, abuts against the cover portion 33 of the upper retainer 31.

[0106] The elastic member 90 is made of a material with a smaller Young's modulus than that of the retainer 30. Specifically, as an example, the elastic member 90 is made of rubber.

[0107] In this embodiment, it is preferable that the outer diameter of the elastic member 90 is adjusted to be substantially the same as the inner diameter of the peripheral wall portion 35 of the upper retainer 31, which allows for easy positioning of the elastic member 90 relative to the upper retainer 31. Furthermore, it is preferable that the inner diameter of the elastic member 90 is adjusted to be substantially the same as the diameter of the through hole 37.

[0108] At the elastic member 90, a groove 41A is provided. This groove 41A is a concave shape that opens towards the riveting part F1 and extends along the annular riveting part F1. That is, the groove 41A is formed in an annular shape and is arranged separately from the valve 22 when viewed axially. In addition, as an example, the groove 41A is formed with a groove width larger than the diameter of the first holes 40A and 40B, and the groove 41A communicates with the two first holes 40A and 40B respectively.

[0109] like Figure 9As shown, regarding the elastic member 90, one of the two first holes 40A and 40B, 40A and 40B, is positioned corresponding to the clamping shaft. In this embodiment, as an example, one first hole 40A is used as an injection port for the resin member 50, and the other first hole 40B is used as an outlet for the resin member 50.

[0110] Next, the manufacturing method of the above-mentioned energy storage device 1A and the inspection method for inspecting the case where the resin component 50 is disposed in the tank 41A in the above-mentioned energy storage device 1A will be described. Figure 11 It is used for explanation Figure 9 A schematic cross-sectional view of the injection method and inspection method of the resin component 50 in the energy storage device 1A.

[0111] The energy storage device 1, which includes the aforementioned elastic member 90, can be assembled (manufactured) by, for example, performing the following process. Specifically, first, the elastic member 90 is inserted into the upper retainer 31, with one side of the elastic member 90 abutting against the support surface 33A. Next, the positive terminal side of the energy storage unit 10 is inserted into the peripheral wall portion 35 of the upper retainer 31 in which the elastic member 90 is inserted, and the riveting portion F1 of the energy storage unit 10 and the outer peripheral portion 22B of the valve 22 adjacent to the riveting portion F1 abut against the elastic member 90.

[0112] Next, the injection of resin component 50 begins. Specifically, as follows: Figure 11 As shown, for example, using a dispenser 60, a predetermined amount of resin component 50 is injected from one first hole 40A to fill the groove 41A with the resin component 50. Here, the predetermined amount is set to be more than the amount that fills the entire groove 41A and the two first holes 40A and 40B.

[0113] Next, the case where the resin component 50 is disposed in the groove 41A is inspected. In this embodiment, as an example, such as Figure 11 As shown, the case where resin component 50 is discharged from another first hole 40B is detected. If resin component 50 is discharged from another first hole 40B, it is determined that resin component 50 is disposed in tank 41A.

[0114] After the resin component 50 is filled into the groove 41A, the portion of the frame 12 of the energy storage unit 10 that protrudes from the upper retainer 31 is inserted and housed in the lower retainer 32. The upper retainer 31 and the lower retainer 32 are then fixed together using bolts or other fixing units not shown. At this time, by fixing the upper retainer 31 and the lower retainer 32 under a predetermined pressure applied by pressing the positive end of the energy storage unit 10 against the elastic member 90, the energy storage unit 10 can be fixed by the reaction force of the elastic member 90. Finally, if the positive busbar 51 and the negative busbar 52 are fixed to the upper retainer 31 and the lower retainer 32 by welding or the like, the assembly of the energy storage device 1A is completed.

[0115] Next, the effects of the energy storage device 1A in the second embodiment will be explained.

[0116] In the energy storage device 1A of the second embodiment, the elastic member 90 is pressed downward by the support surface 33A of the upper retainer 31, thereby pressing the riveting portion F1 of the energy storage unit 10 downward. As a result, the riveting portion F1 can be more firmly sealed to the plate-shaped member 13 and the washer 26, and the airtightness of the energy storage unit 10 can be improved.

[0117] Furthermore, in the energy storage device 1A of the second embodiment, the Young's modulus of the elastic member 90 with the groove 41A is smaller than that of the retaining member 30. Therefore, by absorbing the manufacturing tolerances of the energy storage unit 10 and the retaining member 30 by the elastic member 90, it is possible to suppress the excessive amount of resin component 50 leaking from the groove 41A.

[0118] Furthermore, in the energy storage device 1A of the second embodiment, the cover 33 of the upper retainer 31 has two first holes 40A and 40B. Therefore, when the resin component 50 is disposed in the tank 41A, by checking the resin component 50 flowing out from the first hole 40B other than the first hole 40A, which is the injection port of the resin component 50, it is possible to confirm that the resin component 50 is disposed in the tank 41A.

[0119] Furthermore, since the energy storage unit 10 is housed within the retaining member 30 via the elastic member 90, input from external sources, such as the retaining member 30, can also be attenuated. Therefore, the energy storage device 1A of this embodiment can be said to suppress leakage caused by external forces by employing the elastic member 90.

[0120] [Additional Explanation]

[0121] In the first embodiment described above, when injecting the resin component 50, the upper retainer 31 is reversed so that the cover portion 33 of the upper retainer 31 is located on the lower side in the vertical direction. However, this disclosure is not limited to this, and it is also possible not to reverse it.

[0122] Furthermore, in the first embodiment described above, the resin component 50 is detected by the imaging device 70 or the displacement measuring device 80 at a position 180 degrees opposite to the first hole 40 on the side of the shaft that holds the energy storage unit 10. However, this disclosure is not limited to this, and the detection can be performed at any position. In addition, the detection can be performed at multiple positions, not just one.

[0123] Furthermore, in the first embodiment described above, the support surface 33A is provided on the cover portion 33, but this disclosure is not limited thereto. For example, the lower part of the cover portion 33, which is more circumferentially inner than the groove portion 41, may be a rubber component, and the support surface 33A may be provided on this rubber component. In this case, the upper retainer 31 is made of a composite material. By making it in this way, it is possible to suppress the resin component 50 from protruding towards the valve 22 side.

[0124] This disclosure is not limited to the above-described embodiments, and various modifications can be made to implement it without departing from the spirit of this disclosure. Furthermore, all of these modifications are encompassed within the technical concept of this disclosure. Additionally, unless otherwise specified in the specification, the structural elements of this disclosure are not limited to one and multiple elements may exist.

Claims

1. An energy storage device, comprising: Cylindrical battery; The retainer has an end wall opposite to an annular riveting portion provided at one end of the cylindrical battery in the axial direction and an outer peripheral wall extending from the end wall, the retainer holding the cylindrical battery; The first hole is provided on one end wall of the retainer and extends through it in the axial direction; A groove, provided on one end wall of the retainer, is a concave shape opening towards the riveting portion, extending along the riveting portion and communicating with the first hole; and A resin component disposed on at least a portion of the groove, including the side of the riveting portion.

2. The energy storage device according to claim 1, wherein, The resin component is disposed on at least a portion of the first hole.

3. The energy storage device according to claim 1, wherein, The outer peripheral wall is provided with a gap between it and the outer peripheral surface of the cylindrical battery. The energy storage device also has a communication path that connects the gap to the slot.

4. The energy storage device according to claim 1, wherein, The energy storage device includes a discharge valve located at one end of the cylindrical battery. Viewed from the axial direction, the groove is configured separately from the discharge valve.

5. The energy storage device according to claim 4, wherein, The energy storage device has a second hole, which is disposed on one end wall of the retainer and is arranged facing the discharge valve.

6. The energy storage device according to claim 1, wherein, The energy storage device also includes an elastic member disposed on the cylindrical battery side of one end wall of the retainer, and has the groove portion thereon. The Young's modulus of the elastic component is smaller than that of the retaining component.

7. The energy storage device according to claim 1, wherein, The energy storage device includes a plurality of first holes disposed on one end wall of the retainer.

8. The energy storage device according to claim 3, wherein, The connecting path includes a first portion, which is formed such that the height of the axial direction is higher than the height of the connecting path on the first hole side.

9. The energy storage device according to claim 3, wherein, The resin component is configured to extend from the groove to the communication path.

10. A manufacturing method for manufacturing the energy storage device according to claim 3, wherein in the manufacturing method, The retainer is divided along the axial direction. The end-side retainer with one end wall of the pre-divided retainer is installed on the positive electrode side of the cylindrical battery. The resin component is injected into the groove through the first hole. The resin component flowing into the gap is detected from the gap on the side opposite to the end wall. When the amount of resin component flowing into the gap reaches a predetermined amount, the injection of the resin component from the first hole is stopped.

11. The manufacturing method according to claim 10, wherein, The resin component is injected with one end wall positioned on the lower side in the vertical direction.

12. The manufacturing method according to claim 10, wherein, The detection of the resin component flowing into the gap is performed on the side opposite to the first hole, which is on the axis that clamps the cylindrical battery.

13. An inspection method for inspecting the case where the resin component is disposed in the tank portion of the energy storage device according to claim 3, wherein, When the resin component is injected into the groove through the first hole, the resin component flowing into the gap is detected from the gap on the side opposite to the end wall.

14. The inspection method according to claim 13, wherein, The detection of the resin component flowing into the gap is based on images obtained by photographing the gap.

15. The inspection method according to claim 13, wherein, The detection of the resin component flowing into the gap is performed by measuring the displacement in the gap.

16. The inspection method according to claim 13, wherein, The detection of the resin component flowing into the gap is performed with one end wall positioned on the lower side in the vertical direction.

17. The inspection method according to claim 13, wherein, The detection of the resin component flowing into the gap is performed on the side opposite to the first hole, which is on the axis that clamps the cylindrical battery.

Images