JP2019102311A - Manufacturing method of battery pack - Google Patents

Abstract

To provide a manufacturing method of a battery pack capable of reducing the adhesion of a liquid adhesive agent remaining in a tip of a nozzle (a residual liquid adhesive agent) to a second surface of a holder.SOLUTION: A manufacturing method of a battery pack comprises an adhesive agent reduction step of injecting a liquid adhesive agent 30 into a gap G and then making a nozzle 50 closer to a cell 10 positioned in an inner side in a radial direction with respect to the gap G, thereby bringing a residual liquid adhesive agent 31 as the liquid adhesive agent 30 remaining in a tip of the nozzle 50 into contact with the cell 10 in a form in which the liquid adhesive agent is exposed to an outer part from a discharge port 51 of the nozzle 50, then moving the nozzle 50 in a direction away from the cell 10 to thereby separate at least a part of the residual liquid adhesive agent 31 from the nozzle 50 in a form causing it to adhere to the cell 10, so as to reduce an amount of the residual liquid adhesive agent 31 remaining in the tip of the nozzle 50.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a method of manufacturing an assembled battery.

  Conventionally, there is known an assembled battery in which a plurality of cells are fixed to a holder. For example, Patent Document 1 has a first surface and a second surface facing in the opposite direction to the first surface, and a plurality of holding holes, which are holes penetrating between the first surface and the second surface, are formed. The holder, and a cell having an outer diameter smaller than the inner diameter of the holding hole, the plurality of cells inserted in the holding hole of the holder, the outer peripheral surface of the cell, and the holding of the holder There is disclosed an assembled battery comprising: an adhesive in a state of being injected and solidified into a gap between the inner circumferential surface which is an inner circumferential surface which constitutes the hole. In this battery assembly, each cell is fixed to the holder in a manner held by the holder via an adhesive.

JP, 2016-100255, A

  In Patent Document 1, a liquid adhesive is injected into the gap between the outer peripheral surface of the cell and the inner peripheral surface of the hole of the holder as follows. Specifically, in a state in which the second surface of the holder into which the cell is inserted is directed upward, it is above a part of the circumferential direction of the gap between the outer peripheral surface of the cell and the inner peripheral surface of the hole of the holder At a discharge position close to the gap, a discharge port of a nozzle having a discharge port for discharging a liquid adhesive at the tip end is disposed. Then, the liquid adhesive is discharged downward from the discharge port of the nozzle disposed at the discharge position, and the liquid adhesive is injected into the gap.

  By the way, after the liquid adhesive is discharged downward from the discharge port of the nozzle and the liquid adhesive is injected into the gap between the outer peripheral surface of the cell and the inner peripheral surface of the hole of the holder, the liquid adhesive is The ink may remain (remain) on the tip of the nozzle (outside of the discharge port) (this adhesive is used as a residual liquid adhesive) in a mode of being exposed (leaked) to the outside (downward) from the discharge port. Furthermore, thereafter, in order to inject the liquid adhesive into the next gap, the liquid adhesive leaks from the discharge port of the nozzle while the discharge port of the nozzle moves to the discharge position of the next gap. As a result, the amount of residual liquid adhesive at the tip of the nozzle may increase (the diameter of the residual liquid adhesive may increase).

  In such a case, as shown in FIG. 15, when the discharge port 51 of the nozzle 50 is disposed at the discharge position (position shown in FIG. 15) close to the next gap G, the tip of the nozzle 50 (in FIG. The remaining liquid adhesive 31 remaining on the lower end) is a corner between the second surface 20c of the holder 20 and the inner circumferential surface 21h of the holding hole 21 (specifically, the second surface 20c and the groove portion) It may be in contact with the corner between the groove 22 and the groove constituting surface 22h. As a result, at least a part of the residual liquid adhesive 31 may adhere to the second surface 20 c of the holder 20.

  The present invention has been made in view of the present situation, and is to reduce the adhesion of the liquid adhesive (residual liquid adhesive) remaining at the tip of the nozzle to the second surface of the holder. It is an object of the present invention to provide a method of manufacturing an assembled battery.

  In one aspect of the present invention, a plurality of holding holes, each having a first surface and a second surface facing in a direction opposite to the first surface, are formed as holes penetrating between the first surface and the second surface. A holder, and a cell having an outer diameter smaller than the inner diameter of the holding hole, the plurality of cells inserted in the holding hole of the holder, the outer peripheral surface of the cell, and the holding of the holder What is claimed is: 1. A method of manufacturing an assembled battery comprising: an adhesive positioned between: an inner circumferential surface that is an inner circumferential surface that constitutes a hole; and inserting the cell into the holding hole of the holder. And a step above the gap between the outer peripheral surface of the cell and the inner peripheral surface of the hole of the holder in a state where the second surface of the holder into which the cell is inserted is directed upward. The nozzle having a discharge port for discharging the liquid adhesive at a discharge position close to the An adhesive injection step of disposing an outlet, discharging the liquid adhesive from the discharge port downward, and injecting the liquid adhesive into the gap, and a liquid adhesive in the gap After the injection, by bringing the nozzle close to the cell positioned radially inward with respect to the gap, the liquid adhesion remaining on the tip of the nozzle in a manner of being exposed to the outside from the discharge port The residual liquid adhesive, which is an agent, is brought into contact with the cell, and then the nozzle is moved in a direction away from the cell to adhere at least a part of the residual liquid adhesive to the cell And d) reducing the amount of the remaining liquid adhesive remaining at the tip of the nozzle by pulling it away from the nozzle.

  The manufacturing method described above injects the liquid adhesive into the gap between the outer peripheral surface of the cell and the inner peripheral surface of the hole of the holder using a nozzle having a discharge port for discharging the liquid adhesive at the tip. An adhesive injection step is provided. Specifically, in the adhesive injection step, in a state where the second surface of the holder into which the cell is inserted is directed upward, it is above the gap between the outer peripheral surface of the cell and the inner peripheral surface of the hole of the holder, The discharge port of the nozzle is disposed at the discharge position close to the gap. Then, the liquid adhesive is discharged downward from the discharge port of the nozzle disposed at the discharge position, and the liquid adhesive is injected into the gap.

  Furthermore, the above-mentioned manufacturing method comprises an adhesive reducing step of reducing the amount of the residual liquid adhesive remaining at the tip of the nozzle after injecting the liquid adhesive into the gap. Specifically, in the adhesive reducing step, after the liquid adhesive is injected into the gap, the nozzle is inserted into a cell located radially inward with respect to the gap (ie, the inner peripheral surface of the hole of the holder). The liquid adhesive (this is called a residual liquid adhesive) remaining on the tip of the nozzle in a manner of being exposed to the outside from the discharge port by bringing the gap closer to the cell) is referred to as the cell. And at least a portion of the residual liquid adhesive is attached to the cell.

  More specifically, in the adhesive reducing step, after a liquid adhesive is injected into the gap, the nozzle remains close to the cell positioned radially inward with respect to the gap, so that it remains at the tip of the nozzle. The remaining liquid adhesive is brought into contact with the cell. Thereafter, by moving the nozzle in a direction (for example, upward) away from the cell, at least a part of the residual liquid adhesive is pulled away from the nozzle in a manner to be attached to the cell. This makes it possible to reduce the amount of residual liquid adhesive remaining at the tip of the nozzle (reduce the diameter of the residual liquid adhesive on the nozzle).

  In this way, in order to inject the liquid adhesive into the next gap, when the discharge port of the nozzle is arranged at the discharge position close to the next gap in the next adhesive injection step, It becomes difficult for the residual liquid adhesive remaining on the tip to contact the corner between the second surface of the holder and the inner circumferential surface of the hole. As a result, it is possible to reduce the adhesion of the liquid adhesive (residual liquid adhesive) remaining at the tip of the nozzle to the second surface of the holder.

  In the above-described manufacturing method, the above-described adhesive injection step and adhesive reduction step are performed for each of the plurality of cells inserted into the holding holes of the holder. That is, the adhesive injection step and the adhesive reduction step are sequentially performed for each of the cells inserted in the holding hole of the holder, and the above-mentioned for all the cells inserted in the holding hole of the holder Inject the liquid adhesive into the gap.

Moreover, as a cell, the single battery which has one electrode body in a battery case, and the battery which has several electrode bodies in a battery case are mentioned, for example.
Moreover, as a holder, the holder which consists of a flat plate-shaped member and has a holding hole of the form which penetrates a holder in the thickness direction can be mentioned, for example. In this case, the surface facing the one side in the thickness direction of the holder is the first surface, and the surface facing the other side in the thickness direction of the holder is the second surface.

  Further, as the holding hole of the holder, for example, (1) a cylindrical hole extending from the first surface to the second surface of the holder, and (2) a second surface side of the holding hole with respect to the cylindrical hole. A hole obtained by chamfering a portion including the second open end which is an open end (the end on the second surface side of the inner peripheral surface of the holes constituting the holding hole), (3) in a circumferential direction of a cylindrical hole And the hole etc. which added the slot extended to the 2nd field from the middle position between the 1st field and the 2nd field can be mentioned. The holding hole of (3) is a cylindrical cylindrical space extending from the first surface to the second surface of the holder, and a groove adjacent to a radial direction outer side with respect to a part of the cylindrical space in the circumferential direction. It is comprised by the groove part extended to the 2nd surface from the middle position between the surface and the 2nd surface.

  In the above-mentioned “cylindrical shape” of the holding hole, not only “a straight cylindrical shape” in which the inner circumferential surface constituting the holding hole extends straight in the axial direction but also the inner circumferential surface constituting the holding hole has a tapered surface Also included is an "inclined cylindrical shape" in which the circumferential surface extends in an oblique direction at an angle to the axis.

  Moreover, when using the holder which has a holding hole of (3) as a holding hole, the following processes are mentioned as an adhesive agent injection process, for example. Specifically, in the adhesive injection step, an air gap between the groove constituting surface forming the groove and the outer peripheral surface of the cell in the inner peripheral surface of the hole forming the holding hole (this air gap is the cell The adhesive is injected into the circumferential direction of the gap between the outer circumferential surface and the inner circumferential surface of the hole of the holder). For example, in a state where the second surface of the holder into which the cell is inserted is directed upward, the discharge port of the nozzle is disposed at the discharge position above the gap and close to the gap. Then, the liquid adhesive is discharged downward from the discharge port of the nozzle disposed at the discharge position, and the liquid adhesive is injected into the gap. In this case, the position of the nozzle is fixed during the injection of the adhesive into the void (during the discharge of the adhesive from the nozzle).

  The liquid adhesive injected into the gap moves in the gap in the circumferential direction by capillary action and moves downward in the gap. Thereby, the liquid adhesive can be disposed over the entire circumferential direction of the gap. Thereafter, the adhesive disposed in the gap is solidified, whereby the cell is fixed to the holder in a mode in which the cell is bonded to the inner peripheral surface of the hole constituting the holding hole via the adhesive. The adhesive does not have to be disposed over the whole of the holding hole in the depth direction (the thickness direction of the holder) (from the first surface to the second surface of the holder), and a part of the holding hole in the depth direction It should be arranged about.

1 is a perspective view of a battery pack according to an embodiment. It is a top view of the holder concerning an embodiment. It is an enlarged plan view of the holding hole of the holder. FIG. 2 is an enlarged partial cross-sectional view of the battery assembly according to the embodiment. It is a figure explaining the cell insertion process concerning embodiment. It is a figure explaining the adhesive injection | pouring process concerning embodiment. It is another figure explaining the adhesive injection process. It is another figure explaining the adhesive injection process. It is a figure explaining the adhesive agent reduction process concerning embodiment. It is another figure explaining the adhesive agent reduction process. It is a figure explaining the next adhesive injection process. It is a figure explaining the movement of the adhesive agent injected in the crevice. FIG. 5 shows an adhesive placed in a gap; It is a figure explaining the manufacturing method concerning an embodiment. It is a figure explaining the conventional adhesive injection | pouring process.

(Embodiment)
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of the battery assembly 1 according to the embodiment. FIG. 2 is a plan view of the holder 20 constituting the battery assembly 1. FIG. 3 is an enlarged plan view of the holding hole 21 of the holder 20. FIG. FIG. 4 is an enlarged partial sectional view of the battery assembly 1. 4 shows a partial cross section of the battery assembly 1 in which the holder 20 is cut at the position of XX in FIG. Therefore, the cross section of the holder 20 in FIG. 4 corresponds to the XX cross section in FIG. 3. Also in FIGS. 5, 6, 8-11, 13, and 15 described later, the cross section of the holder 20 shows a cross section cut at the position of XX in FIG.

As shown in FIG. 1, the battery assembly 1 of the present embodiment includes a holder 20 and a plurality of cells 10 fixed to the holder 20.
The cell 10 is a cylindrical (cylindrical) lithium ion secondary battery (specifically, a 18650 type lithium ion secondary battery). The cell 10 is a unit cell, and includes a cylindrical battery case 11, and an electrode body (not shown) and a non-aqueous electrolyte (not shown) accommodated inside the battery case 11. The electrode body is a wound electrode body which is wound in a cylindrical shape with a strip separator (not shown) interposed between a strip positive electrode plate (not shown) and a strip negative electrode plate (not shown).

  The positive electrode plate of the electrode assembly is disposed at one end surface (the lower surface in FIGS. 1 and 4) in the axial direction AH of the cell 10 (the direction along the axis AX of the cell 10, the vertical direction in FIGS. A convex positive electrode terminal 12 electrically connected to the above is provided. Further, the other end surface (upper surface in FIGS. 1 and 4) in the axial direction AH of the cell 10 is a negative electrode terminal 13 electrically connected to the negative electrode plate of the electrode body inside the cell.

  The holder 20 is formed of a flat plate-shaped metal member (specifically, aluminum) (see FIGS. 1 to 4), and the first surface 20b (the lower surface in FIGS. 1 and 4) And two surfaces 20c (upper surfaces in FIGS. 1 and 4). In the holder 20, a plurality of holding holes 21 (the same number as the cells 10), which are holes penetrating between the first surface 20b and the second surface 20c, are formed. As shown in FIG. 2, these holding holes 21 are arranged side by side in a zigzag form in plan view of the holder 20.

  In the present embodiment, as shown in FIGS. 2 and 3, as the holding hole 21 of the holder 20, the holding hole 21 having the two groove portions 22 is formed. The holding hole 21 is formed between the first surface 20 b and the second surface 20 c of the holder 20 in a circumferential direction of a hole having a cylindrical shape (specifically, an oblique cylindrical shape whose inner peripheral surface is a tapered surface). A groove 22 extending from the intermediate position M1 which is the position to the second surface 20c is added (formed) (see FIG. 4). That is, the holding hole 21 is a cylindrical cylindrical space A1 (see FIG. 3) extending from the first surface 20b to the second surface 20c of the holder 20, and a part of the cylindrical space A1 in the circumferential direction (in the present embodiment) A groove 22 adjacent to the radially outer side (the upper right diagonal and the lower left diagonal in FIG. 3) with respect to two circumferentially opposed parts in the radial direction, the first surface 20 b and the second surface 20 c And a groove 22 extending from an intermediate position M1 to a second surface 20c.

  The two groove portions 22 are formed at positions opposed in the radial direction of the holding hole 21 (see FIG. 3). The groove portion 22 is formed of a groove configuration surface 22h which is substantially V-shaped in plan view and extends straight in the thickness direction of the holder 20 (the axial direction BH of the holding hole 21; the vertical direction in FIG. 4). The groove-constituting surface 22h extends from an intermediate position M1, which is a position between the first surface 20b and the second surface 20c of the holder 20, to the second surface 20c (see FIG. 4). Accordingly, the groove 22 is a groove that opens only to the second surface 20 c side of the holder 20. The groove forming surface 22 h is a part of the hole inner peripheral surface 21 h of the holder 20 which constitutes the holding hole 21. Further, as shown in FIG. 2, the two groove portions 22 in each holding hole 21 have a direction oblique to the left and right direction in FIG. 2 (specifically, an inclination angle of 30 ° (Opposite direction).

  In the present embodiment, as shown in FIG. 4, the outer diameter D3 of the cell 10 is the minimum inner diameter of the holding hole 21 (specifically, the first opening which is the opening end of the holding hole 21 on the first surface 20 b side) It is smaller than the inner diameter D1) of the end 21f. Thus, the cell 10 is insertable into the holding hole 21. Specifically, a part of the cell 10 is inserted into the holding hole 21.

  Furthermore, as shown in FIG. 4, in the battery pack 1 of the present embodiment, in the gap G between the outer peripheral surface 10 b of the cell 10 and the inner peripheral surface 21 h of the holder 20 that constitutes the holding hole 21. It has the adhesive 30 injected and solidified. Thereby, each cell 10 is fixed to the holder 20 in a mode in which it is held by the holder 20 via the adhesive 30 (joined to the inner circumferential surface 21 h of the holding hole 21 via the adhesive 30). ing.

  Therefore, in the assembled battery 1 of the present embodiment, even when vibration or impact is applied to the assembled battery 1, the cell 10 is in the radial direction (left and right direction in FIG. 4) of the holding hole 21 and in the axial direction BH (of the holding hole 21). It does not move in the direction along the axis BX, in the vertical direction in FIG. 4), and no rattling occurs between the cell 10 and the holder 20. For this reason, the battery assembly 1 of the present embodiment is a battery assembly in which the cell 10 is securely fixed to the holder 20 (holding hole 21).

  In the present embodiment, in order to reduce the amount of adhesive 30 used, the adhesive 30 is used over the entire depth direction of the holding hole 21 (the thickness direction of the holder 20, the vertical direction in FIG. 4) (holder 20 First surface 20b to the second surface 20c)). Specifically, the adhesive 30 is disposed only in the range from the intermediate position M2, which is the position between the first surface 20b and the second surface 20c of the holder 20, to the first surface 20b.

Next, a method of manufacturing the battery assembly of the present embodiment will be described.
FIG. 5 is a diagram for explaining a cell insertion process according to the embodiment. 6-8 is a figure explaining the adhesive injection | pouring process concerning embodiment. FIG. 9 and FIG. 10 are diagrams for explaining the adhesive reduction process according to the embodiment. FIG. 11 is a diagram for explaining the next adhesive injection step. More specifically, FIG. 11 shows the adhesion performed after the adhesive injection step shown in FIGS. 6 to 8 among the adhesive injection steps performed a plurality of times according to the number of cells 10 inserted in the cell insertion step. It is a figure explaining an agent injection process. Therefore, FIG. 11 corresponds to a diagram showing an adhesive injection process performed after performing the adhesive reduction process shown in FIGS. 9 and 10 after the adhesive injection process shown in FIGS.

  First, a predetermined number of cells 10 and a holder 20 are prepared. Then, in the cell insertion step, as shown in FIG. 5, the cell 10 is inserted into the holding hole 21 of the holder 20. Specifically, the cell 10 is inserted into the holding hole 21 from the first surface 20 b side of the holder 20 in a state where the second surface 20 c of the holder 20 is directed upward (the first surface 20 b is directed downward). The cell 10 is inserted into the holding hole 21 from the negative electrode terminal 13 side, and in the state where the position of the negative electrode terminal 13 (bottom surface of the cell 10) matches the second surface 20c of the holder 20 in the axial direction BH. Temporarily held by a jig that does not move (see FIG. 6).

  Next, in the adhesive injection step, the gap between the outer peripheral surface 10b of the cell 10 and the inner peripheral surface 21h of the holder 20 is obtained using the nozzle 50 having the discharge port 51 for discharging the liquid adhesive 30 at its tip. A liquid adhesive 30 is injected into G. Specifically, as shown in FIGS. 6 to 8, with the second surface 20 c of the holder 20 directed upward (the first surface 20 b downward), the second surface 20 c side of the holder 20 (holder 20 The liquid adhesive 30 is injected into the gap G from above the In the present embodiment, the liquid adhesive 30 is injected into a part of the annular gap G in the circumferential direction (a part in the circumferential direction CH, a part in the circumferential direction CH).

  Specifically, as shown in FIG. 6 to FIG. 8, among the hole inner peripheral surface 21 h configuring the holding hole 21, the groove configuration surface 22 h configuring the groove portion 22 and the outer peripheral surface 10 b of the cell 10 A liquid adhesive 30 is injected into the void K (this void K corresponds to a part in the circumferential direction of the gap G between the outer circumferential surface 10b of the cell 10 and the inner circumferential surface 21h of the holder 20). . More specifically, in a state where the second surface 20c of the holder 20 into which the cell 10 is inserted is directed upward (the first surface 20b is directed downward), the groove portion is from above the second surface 20c side of the gap K A liquid adhesive 30 is injected toward 22.

  Specifically, as shown in FIG. 6, the second surface 20 c of the holder 20 into which the cell 10 is inserted is directed vertically upward (the first surface 20 b is directed vertically downward), and is above the gap K The discharge port 51 of the nozzle 50 is disposed at the discharge position (the position shown in FIG. 6) close to the gap K. Then, the liquid adhesive 30 is discharged downward from the discharge port 51 of the nozzle 50 disposed at the discharge position, whereby the liquid adhesive 30 is injected into the gap K (a part of the gap G).

  The amount of the adhesive 30 injected into the gap K (i.e., the total amount of the adhesive 30 discharged from the nozzle 50 for one groove 22) is a predetermined amount. The position of the nozzle 50 is fixed while the adhesive 30 is being injected into the gap K (during the period when the adhesive 30 is being discharged from the discharge port 51 of the nozzle 50). FIG. 6 is a view when the injection of the adhesive 30 is started, and FIG. 8 is a view when the injection of the adhesive 30 is finished (that is, the injection of the adhesive 30 in the specified amount is completed into the cavity K). When).

  As shown in FIG. 7, the discharge port 51 of the nozzle 50 (indicated by a two-dot chain circle in FIG. 7) is smaller than the opening 22b (the portion indicated by cross hatching in FIG. 7) of the groove 22. There is. Thus, the adhesive 30 can be appropriately injected into the groove 22 (in the void K). FIG. 7 is a view showing a state in which the adhesive 30 is discharged from the discharge port 51 of the nozzle 50 toward the groove 22 (the gap K) in the adhesive injection step, and a plan view of FIG. Top view).

  Further, in the present embodiment, the adhesive 30 is simultaneously discharged from the two nozzles 50 toward the groove portions 22 formed two for one holding hole 21 respectively. That is, even when the adhesive 30 is discharged from the nozzle 50 toward the groove 22 shown in FIGS. 6-8, the same nozzle not shown is also shown when directed toward the groove 22 not shown in FIGS. The adhesive 30 is discharged from 50. Therefore, the adhesive 30 is simultaneously injected into the gaps K which exist two for one holding hole 21 respectively. That is, simultaneously with the injection of the adhesive 30 into the space K shown in FIGS. 6-8, the adhesive 30 is injected into the space K not shown in FIGS. 6-8.

  For this reason, in the present embodiment, the amount of the adhesive 30 discharged from the nozzle 50 toward one groove 22 is half the total amount of the adhesive 30 injected into one gap G in the adhesive injection step. As described above, in the present embodiment, since the predetermined amount of the adhesive 30 is injected into each of the gaps G using the two nozzles 50, compared to the case where injection is performed using one nozzle. The time required for injection of the adhesive 30 can be shortened. Moreover, in the present embodiment, the entire amount (specified amount) of the adhesive 30 to be injected into each gap G is injected into the two gaps K present in each gap G at once in a short time. Thereby, the time which injection | pouring of the adhesive agent 30 requires can be shortened significantly.

  Further, in the present embodiment, in the adhesive injection step, the liquid adhesive 30 having a viscosity (for example, a viscosity of 270 mPa · s) within the range of 1 to 500 mPa · s is injected into the cavity K. By injecting such a low viscosity adhesive 30, the adhesive 30 can easily enter the cavity K, and the adhesive 30 can be promptly injected into the cavity K. Thereby, the adhesive agent 30 of the whole quantity (prescribed amount) injected in each void | space part K can be inject | poured at a stretch in a short time.

  Further, in the holder 20 of the present embodiment, the inner diameter D1 of the circular first opening end 21f, which is the opening end on the first surface 20b side of the holding hole 21, is the opening end on the second surface 20c side of the holding hole 21. The diameter is smaller than the minimum inner diameter D2 (the inner diameter of the portion where the groove 22 is not formed) of the circular second opening end 21g (see FIGS. 3 and 4). Thereby, as described later, in a state where the second surface 20c of the holder 20 is directed upward (the first surface 20b is directed downward), the adhesive 30 is separated from the adhesive G from the second surface 20c side of the holder 20 (details The adhesive 30 is less likely to drip downward from the first surface 20 b side after being injected into the cavity K).

  Moreover, in the holder 20 of the present embodiment, a portion of the hole inner peripheral surface 21 h constituting the holding hole 21 excluding the groove constituting surface 22 h constituting the groove portion 22 is directed from the first surface 20 b to the second surface 20 c The tapered surface 21t has an inner diameter increasing in accordance with the equation (see FIGS. 4 and 8). For this reason, after the adhesive 30 is injected into the gap G from the second surface 20c side of the holder 20 as described above, the adhesive 30 can easily flow to the first surface 20b side along the tapered surface 21t. Therefore, the adhesive 30 can be easily disposed in the gap G.

  The liquid adhesive 30 injected into the gap K in the adhesive injection step moves in the gap G in the circumferential direction CH by capillary action as shown by the arrow in FIG. Move down. As a result, as shown in FIG. 13, the liquid adhesive 30 can be disposed over the entire circumferential direction CH of the gap G in the range from the intermediate position M2 of the holder 20 to the first surface 20b. Thereafter, the adhesive 30 disposed in the gap G is solidified to fix the cell 10 to the holder 20 in a mode in which the cell 10 is joined to the inner peripheral surface 21 h of the holding hole 21 via the adhesive 30. Be done.

  By the way, in the adhesive injection step, the liquid adhesive 30 is discharged downward from the discharge port 51 of the nozzle 50 to form the gap G between the outer peripheral surface 10 b of the cell 10 and the inner peripheral surface 21 h of the holder 20 (details The liquid adhesive 30 is injected into the cavity K), and then the liquid adhesive 30 is exposed (leaked) to the outside (downward) from the discharge port 51, as shown in FIG. It may remain (remain) at the tip of the nozzle 50 (outside of the discharge port 51) (this adhesive is referred to as a residual liquid adhesive 31).

  Furthermore, after that, the nozzle 50 is injected to inject the liquid adhesive 30 into the next gap G (for example, another gap G adjacent to the gap G into which the adhesive 30 has been injected in the present adhesive injection step). The discharge port 51 of the nozzle 50 moves from the discharge port 51 of the nozzle 50 to the discharge position of the next gap G (specifically, the gap K) from the current position (the discharge position of the gap G this time). The liquid adhesive 30 may leak and the amount of residual liquid adhesive 31 at the tip of the nozzle 50 may increase (the diameter of the residual liquid adhesive 31 may increase) (see FIG. 15).

  In such a case, as shown in FIG. 15, when the discharge port 51 of the nozzle 50 is disposed at the discharge position (the position shown in FIG. 15) close to the next gap G (specifically, the gap K). The remaining liquid adhesive 31 remaining on the tip (lower end in FIG. 15) of the nozzle 50 is a corner between the second surface 20c of the holder 20 and the inner circumferential surface 21h of the holding hole 21 (details (The corner between the groove 22 and the groove forming surface 22h of the groove 22). As a result, at least a part of the residual liquid adhesive 31 may adhere to the second surface 20 c of the holder 20.

  On the other hand, in the present embodiment, as shown in FIG. 8, after the liquid adhesive 30 is injected into the gap G in the adhesive injection step, the tip of the nozzle 50 (lower end in FIG. 8) in the adhesive reduction step. The amount of residual liquid adhesive 31 remaining in the Specifically, in the adhesive agent reducing step of the present embodiment, after the liquid adhesive 30 is injected into the gap G, the cell 50 positioned radially inward with respect to the gap G (ie, The cell 10 forming the gap G with the hole inner circumferential surface 21 h of the holder 20 is brought close to the cell 10 shown in FIG. More specifically, as shown by the arrow in FIG. 8, the nozzle 50 is moved in parallel in a direction (left direction in FIG. 8) in which the discharge port 51 of the nozzle 50 approaches the axis AX of the cell 10.

  By doing this, as shown in FIG. 9, the liquid adhesive 30 (residual liquid adhesive 31) remaining on the tip of the nozzle 50 in a mode of being exposed to the outside from the discharge port 51 of the nozzle 50, The cell 10 (specifically, the corner between the negative electrode terminal 13 of the cell 10 and the outer peripheral surface 10b) is brought into contact with at least a portion of the residual liquid adhesive 31 in the cell 10 (specifically, It adheres to the corner | angular part between the negative electrode terminal 13 of the cell 10 and the outer peripheral surface 10b. Thereby, the amount of the residual liquid adhesive 31 remaining at the tip of the nozzle 50 can be reduced (the diameter of the residual liquid adhesive 31 of the nozzle 50 can be reduced).

  More specifically, after injecting the liquid adhesive 30 into the gap G, as shown in FIG. 9, the nozzle 50 is brought close to the cell 10 positioned radially inward with respect to the gap G, and the nozzle The remaining liquid adhesive 31 remaining at the tip of the 50 is brought into contact with the cell 10, and then the nozzle 50 is moved in a direction away from the cell 10 as shown in FIG. 10 (in the present embodiment, the nozzle 50 is Raise).

  As a result, at least a part of the adhesive 30 constituting the residual liquid adhesive 31 remaining at the tip of the nozzle 50 adheres (remains) to the cell 10 while being separated (separated) from the nozzle 50. That is, the residual liquid adhesive 31 remaining at the tip of the nozzle 50 is pulled away (is separated) from the nozzle 50 in a manner of adhering (remaining) to the cell 10. Thereby, as shown in FIG. 10, the amount of the residual liquid adhesive 31 remaining at the tip of the nozzle 50 can be reduced (the diameter of the residual liquid adhesive 31 of the nozzle 50 can be reduced).

  The liquid adhesive 30 attached to the cell 10 (specifically, the corner between the negative electrode terminal 13 of the cell 10 and the outer peripheral surface 10 b) is, for example, thereafter lowered along the outer peripheral surface 10 b of the cell 10 , And mixed with the liquid adhesive 30 injected into the gap G.

  As described above, in the present embodiment, the liquid adhesive 30 is injected into the gap G in the adhesive injection step, and then the nozzle 50 is made radially inward with respect to the gap G in the adhesive reduction step. After bringing the residual liquid adhesive 31 remaining at the tip of the nozzle 50 into contact with the cell 10 close to the cell 10 located, the nozzle 50 is moved in a direction away from the cell 10 (moved upward). As a result, at least a portion of the adhesive 30 constituting the residual liquid adhesive 31 remaining at the tip of the nozzle 50 is separated from the nozzle 50 in a manner adhering to the cell 10, and therefore remains at the tip of the nozzle 50. The amount of residual liquid adhesive 31 decreases (the diameter of the residual liquid adhesive 31 decreases) (see FIG. 10).

  By doing this, as shown in FIG. 11, in order to inject the liquid adhesive 30 into the next gap G (the gap K), in the next adhesive injection step, the next gap G (the gap When the discharge port 51 of the nozzle 50 is disposed at the discharge position (the position shown in FIG. 11) close to the portion K), the residual liquid adhesive 31 remaining at the tip of the nozzle 50 is the second surface 20c of the holder 20. It becomes difficult to contact the corner between the hole and the inner circumferential surface 21h. Thereby, the liquid adhesive 30 (the residual liquid adhesive 31) remaining at the tip of the nozzle 50 can be prevented from adhering to the second surface 20c of the holder 20.

  In the present embodiment, the adhesive injection step and the adhesive reduction step described above are performed for each of the plurality of cells 10 inserted into the holding holes 21 of the holder 20. That is, for each cell 10 inserted into the holding hole 21 of the holder 20, all of the cells inserted into the holding hole 21 of the holder 20 are sequentially subjected to the adhesive injection step and the adhesive reduction step. In the cell 10, the liquid adhesive 30 is injected into the gap G (the gap K).

  Specifically, for example, in the first (first) adhesive injection step, for the cell 10 shown by A in FIG. 14 (the cell 10 located at the top left in FIG. 14), the outer peripheral surface 10b of the cell 10 and the holder The liquid adhesive 30 is injected into the gap G (specifically, the gap K) between the inner circumferential surface 21 h of the holes 20. More specifically, from the discharge port 51 of the nozzle 50, the discharge port 51 of the nozzle 50 is disposed at the discharge position (the position shown in FIG. 6) above the gap K and close to the space K. By discharging the liquid adhesive 30 downward, the liquid adhesive 30 is injected into the gap K (a part of the gap G).

  When the liquid adhesive 30 is completely injected into the gap K (a part of the gap G) (when the predetermined amount of the liquid adhesive 30 has been discharged from the discharge port 51), as shown in FIG. The adhesive 30 remains (remains) on the tip of the nozzle 50 (outside the discharge port 51) in a mode in which the adhesive 30 is exposed (leaked) to the outside (downward) from the discharge port 51 (the adhesive 30 is a residual liquid adhesive 31).

  Next, in the first (first) adhesive reduction step, as shown by the arrows in FIG. 8, the nozzle 50 is brought close to the cell 10 (cell 10 shown by A) located radially inward with respect to the gap G. The remaining liquid adhesive 31 remaining at the tip of the nozzle 50 is brought into contact with the cell 10, as shown in FIG. Thereafter, as shown in FIG. 10, the nozzle 50 is raised (moved away from the cell 10). By doing this, as shown in FIG. 10, at least a part of the adhesive 30 constituting the residual liquid adhesive 31 remaining at the tip of the nozzle 50 adheres to the cell 10, the nozzle 50. Thus, the amount of the remaining liquid adhesive 31 remaining at the tip of the nozzle 50 can be reduced (the diameter of the remaining liquid adhesive 31 can be reduced).

  Thereafter, the process proceeds to the next (second) adhesive injection step, and the outer peripheral surface of the cell 10 indicated by B in FIG. 14 (the cell 10 positioned to the right of the cell 10 indicated by A in FIG. 14). A liquid adhesive 30 is injected into the gap G (specifically, the gap K) between the hole 10 b and the inner circumferential surface 21 h of the holder 20.

  Specifically, the discharge port 51 of the nozzle 50 is moved from the position above the gap K applied to the cell 10 indicated by A to above the gap K applied to the cell 10 indicated by B, and further the nozzle 50 The discharge port 51 of the nozzle 50 is disposed at the discharge position (the position shown in FIG. 11) above the gap K applied to the cell 10 indicated by B and in the vicinity of the gap K.

  At this time, in the previous (first) adhesive reduction step, the amount of the remaining liquid adhesive 31 remaining at the tip of the nozzle 50 is reduced (the diameter of the remaining liquid adhesive 31 is reduced) Therefore, the residual liquid adhesive 31 located at the tip of the nozzle 50 does not easily come in contact with the corner between the second surface 20 c of the holder 20 and the hole inner peripheral surface 21 h. Thereby, the liquid adhesive 30 (the residual liquid adhesive 31) remaining at the tip of the nozzle 50 can be prevented from adhering to the second surface 20c of the holder 20.

  Thereafter, in the same manner as in the first adhesive injection step, the liquid adhesive 30 is injected into the gap K (part of the gap G) of the cell 10 indicated by B in FIG. Next, the process proceeds to the next (second) adhesive reduction step, and at least a portion of the residual liquid adhesive 31 remaining at the tip of the nozzle 50 is attached to the cell 10 in the same manner as the first adhesive reduction step. Thus, the amount of the residual liquid adhesive 31 remaining at the tip of the nozzle 50 is reduced (the diameter is reduced).

  In this embodiment, the adhesive injection step and the adhesive reduction step described above are sequentially performed on each of the cells 10 inserted into the holding holes 21 of the holder 20 in this manner. A liquid adhesive is contained in the gap G (the gap K) applied to all the cells 10 inserted in the holding holes 21 of the holder 20 while suppressing the liquid adhesive 30 from adhering to the second surface 20c. 30 can be injected.

  Thereafter, the adhesive 30 disposed in each of the gaps G is solidified so that each cell 10 is joined to the inner circumferential surface 21 h of the holding hole 21 via the adhesive 30, It is fixed to the holder 20. Thereby, the assembled battery 1 shown in FIG. 1 is completed.

  Although the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments, and it goes without saying that the present invention can be appropriately modified and applied without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1 assembled battery 10 cell 10 b outer peripheral surface 20 holder 20 b first surface 20 c second surface 21 holding hole 21 h hole inner peripheral surface 22 groove 22 h groove configuration surface 30 adhesive 31 residual liquid adhesive 50 nozzle 51 discharge port CH circumferential direction D1 holding Inner diameter of hole (the inner diameter of the first open end)
D2 Inner diameter of holding hole (minimum inner diameter of second open end)
D3 Cell outer diameter G Gap K Gap (a part of the gap in the circumferential direction)

Claims (1)

A holder having a first surface and a second surface facing in a direction opposite to the first surface, and a plurality of holding holes being holes penetrating between the first surface and the second surface;
A cell having an outer diameter smaller than an inner diameter of the holding hole, and a plurality of cells inserted into the holding hole of the holder;
A manufacturing method of an assembled battery comprising: an adhesive positioned between an outer peripheral surface of the cell and an inner peripheral surface of the holder, which is an inner peripheral surface of the holding hole of the holder.
A cell inserting step of inserting the cell into the holding hole of the holder;
With the second surface of the holder into which the cell is inserted facing upward, it is above the gap between the outer peripheral surface of the cell and the inner peripheral surface of the hole of the holder and is close to the gap The discharge port of a nozzle having a discharge port for discharging the liquid adhesive is disposed at a discharge position, and the liquid adhesive is discharged downward from the discharge port to form a liquid in the gap. An adhesive injection step of injecting the adhesive;
After the liquid adhesive is injected into the gap, the nozzle is brought closer to the cell positioned radially inward with respect to the gap, whereby the nozzle is exposed in the aspect of being exposed to the outside from the discharge port. At least one of the residual liquid adhesives is brought into contact by bringing the residual liquid adhesive, which is the liquid adhesive remaining at the tip, into contact with the cell and then moving the nozzle in a direction away from the cell. An adhesive reducing step of separating the part from the nozzle in a manner of adhering the cell to the cell to reduce the amount of the residual liquid adhesive remaining at the tip of the nozzle. .

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