JP7154027B2 - Method for manufacturing power storage device - Google Patents

Description

The present disclosure relates to a method for manufacturing a power storage device.

Conventionally, there is a power storage device described in Patent Document 1 below. A power storage device described in Patent Document 1 includes an electrode connector that connects a plurality of power storage elements in series. The electrode connector is composed of a clip and a slide frame. In this electrode connector, after the electrode terminal of one of the two adjacent energy storage elements and the electrode terminal of the other energy storage element are clamped by the clip, the slide frame is pushed into the clip to correct the positional deviation of the clip. By regulating, the electrode terminals of the two storage elements are sandwiched and brought into contact with each other.

JP 2010-118625 A

By the way, in the power storage device described in Patent Document 1, when three or more power storage elements are connected in series, there are two or more points where the electrode terminals of the adjacent power storage elements are connected. and two or more slide frames are required. In the case of such a structure, it is necessary to push the slide frame into each of the plurality of clips, so there may be a slide frame with insufficient pushing force against the clip. If there is a slide frame with insufficient pushing force against the clip, the slide frame may come off the clip. When the slide frame is removed from the clip and the connection between the electrode terminals of any two storage elements is interrupted, the electrical connection between the plurality of storage elements is interrupted. Functions cannot be guaranteed.

The present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a method of manufacturing a power storage device that can more accurately ensure the connection state of a plurality of power storage elements.

In order to solve the above-mentioned problems, according to the first aspect of the present invention, a plurality of storage elements having electrode terminals protruding left and right outward from left and right side portions are stacked in a vertical direction, and An insulating member that sandwiches and contacts the electrode terminals of the storage elements that are vertically adjacent to each other from above and below is composed of a vertically thick main body and a vertically thin vertically protruding lateral wall from either the left or right side wall of the main body. The electrode terminal protruding to the left has a posture with the protrusion facing right, and the electrode terminal side protruding to the right has a posture with the protrusion facing left. Further, a gap member made of an insulating material and having a shape corresponding to the gap is arranged in the gap between the convex portions of the insulating members which are laminated and which are adjacent to each other in the vertical direction. In a method of manufacturing a power storage device in which an element and an insulating member are sandwiched from above and below by outer wall members, the power storage element is stacked vertically, and a gap is formed in a predetermined gap between vertically adjacent electrode terminals. inserting the insulating member into a first step of arranging the member, a gap one above the gap in which the gap member is arranged, and a gap one below the gap in which the gap member is arranged, By positioning the spacing member in the gap between the protrusions of both insulating members, the electrode terminals above and below the gap where the spacing member is arranged are deformed along the surfaces of both the insulating members and the surface of the spacing member. In addition, a second step of making contact while being sandwiched from above and below by both insulating members is performed.
In the invention according to claim 2, in the invention according to claim 1, in the first step, a gap member is arranged every other gap on either the left or right side of the storage element, The gap on the other side is characterized by arranging the gap member in the gap at the upper and lower positions where the gap member is not arranged on the one side.

In addition, a plurality of storage elements arranged side by side in a predetermined direction, a plurality of insulating members arranged in a layered manner in a predetermined direction, and an outer wall member sandwiching the plurality of insulating members in a predetermined direction are provided. The electrode terminals of at least two of the storage elements may be sandwiched between and in contact with two insulating members adjacent to each other in a predetermined direction.
By sandwiching the plurality of insulating members between the outer wall members as in this configuration, substantially uniform force can be applied to each of the plurality of insulating members. Therefore, since the electrode terminals of the storage elements arranged between the adjacent insulating members can be sandwiched with a substantially uniform force, the force for sandwiching the electrode terminals of any one of the plurality of storage elements is insufficient. situation is less likely to occur. Therefore, it is possible to ensure the connection state of the plurality of power storage elements more accurately.

In the power storage device described above, the insulating member preferably has a convex portion in a portion facing the power storage element.
According to this configuration, when the insulating member is assembled to the storage element, the electrode terminals of the storage element can be deformed by the protrusions of the insulating member, so that the electrode terminals of the adjacent storage elements can be easily brought into contact with each other. It is possible to

Preferably, the power storage device described above further includes a gap member arranged between the projections of two insulating members adjacent to each other in a predetermined direction.
According to this configuration, when the insulating member is assembled to the storage element, the electrode terminals of the storage element are sandwiched between the protrusions of the insulating member and the gap member, thereby further deforming the electrode terminals of the storage element. becomes easier. Therefore, the electrode terminals of adjacent storage elements can be brought into contact with each other more easily.

In the power storage device described above, the gap member is preferably made of an insulating material.
According to this configuration, it is possible to avoid unintended electrical continuity between the plurality of power storage elements.
In the power storage device described above, the gap member preferably has a shape corresponding to the gap between the convex portions of two adjacent insulating members in a predetermined direction.

According to this configuration, since the gaps between the projections of the plurality of insulating members can be filled with the gap member, positional deviation of each member can be suppressed.

The power storage device described above preferably further includes a gap member arranged in a gap formed between the plurality of power storage elements, the plurality of insulating members, and the outer wall member.
According to this configuration, since the gaps between the members can be filled with the gap member, it is possible to suppress the displacement of the members.

Advantageous Effects of Invention According to the present disclosure, it is possible to provide a method for manufacturing a power storage device that can more accurately ensure the connection state of a plurality of power storage elements.

FIG. 1 is a perspective view showing a perspective structure of a power storage device according to an embodiment. FIG. 2 is a front view showing the front structure of the power storage device of the embodiment. FIG. 3 is a perspective view showing the perspective structure of the storage element of the embodiment. FIG. 4 is a perspective view showing the perspective structure of the insulating member of the embodiment. FIG. 5 is an enlarged view showing an enlarged structure around a connecting portion of an electrode terminal of a power storage element in the power storage device of the embodiment. FIG. 6 is a perspective view showing the perspective structure of the spacing member of the embodiment. FIG. 7 is a perspective view showing an exploded perspective structure of the power storage device of the embodiment. FIG. 8 is a perspective view showing the perspective structure of the outer wall member of the embodiment. FIG. 9 is a perspective view showing an exploded perspective structure of the power storage device of the embodiment. FIG. 10 is a front view showing a part of the assembling process of the power storage device of the embodiment. FIG. 11 is a front view showing a part of the assembling process of the power storage device of the embodiment. FIG. 12 is a front view showing a part of the assembling process of the power storage device of the embodiment. FIG. 13 is a front view showing the front structure of a power storage device of another embodiment.

An embodiment of a power storage device will be described below with reference to the drawings. In order to facilitate understanding of the description, the same constituent elements in each drawing are denoted by the same reference numerals as much as possible, and overlapping descriptions are omitted.
As shown in FIGS. 1 and 2, the power storage device 10 includes a plurality of power storage elements 20 and a connecting member 30 that connects them in series.

As shown in FIG. 3, the electric storage element 20 is a so-called laminate-type storage battery in which a positive electrode and a negative electrode are alternately stacked with separators interposed therebetween and sealed by lamination. As the electric storage element, for example, a laminated lithium ion battery can be used. Electric storage element 20 is formed flat in the direction indicated by arrow Z. As shown in FIG. The cross-sectional shape of the electric storage element 20 perpendicular to the Z-axis direction is substantially rectangular. The electric storage element 20 has a substantially rectangular parallelepiped thick portion 23 in its central portion, and has a thin portion 24 on the outer edge of the thick portion 23 . A positive electrode, a negative electrode, a separator, and the like are accommodated inside the thick portion 23 .

In addition, below, the longitudinal direction of the electric storage element 20 is called "X-axis direction", and the short direction of the electric storage element 20 is called "Y-axis direction." Also, the Z1-axis direction, which is one of the Z-axis directions, is also referred to as the "upward direction", and the Z2-axis direction, which is the opposite direction, is also referred to as the "downward direction".
Electrode terminals 21 and 22 are provided on both side surfaces of the storage element 20 in the X-axis direction. The electrode terminal 21 is either one of the positive terminal and the negative terminal, and the electrode terminal 22 is the other of the positive terminal and the negative terminal. As shown in FIG. 2, the plurality of power storage elements 20 are arranged side by side so as to be stacked in the Z-axis direction. In this embodiment, the Z-axis direction corresponds to the predetermined direction.

As shown in FIGS. 1 and 2, the connecting member 30 includes a plurality of insulating members 31, a plurality of gap members 32, and outer wall members 33,34.
As shown in FIG. 4, the insulating member 31 is a substantially rectangular parallelepiped rod-shaped member formed to extend in the Y-axis direction. The insulating member 31 is made of an insulating material such as resin. One side wall portion of the insulating member 31 in the X-axis direction is formed such that the width in the Z-axis direction gradually narrows toward the outside. As a result, tapered surfaces 311 are formed on both side surfaces of the side wall portion of the insulating member 31 in the Z-axis direction. A protrusion 312 is formed on the side wall of the insulating member 31 so as to protrude in the X-axis direction from the center in the Z-axis direction.

As shown in FIGS. 1 and 2, a plurality of insulating members 31 are stacked on one end in the X-axis direction of the stacked structure of the storage element 20 and the other end on the opposite side. . As shown in FIG. 5 , thin portion 24 of storage element 20 is arranged along convex portion 312 of insulating member 31 , and electrode terminal 21 of storage element 20 is disposed along tapered surface 311 of insulating member 31 . , 22 are arranged. Between adjacent insulating members 31, 31, electrode terminals 21, 22 provided at one ends of adjacent storage elements 20, 20 are sandwiched. As a result, the tip portions of the electrode terminals 21 and 22 provided at one end portions of the plurality of storage elements 20 are in contact with each other and electrically connected. A plurality of electric storage elements 20 are electrically connected in series by such a connection structure of the insulating member 31 .

As shown in FIG. 4, at both ends of the insulating member 31 in the Y-axis direction, bolt insertion holes 313 are formed so as to penetrate in the Z-axis direction. A bolt 35 shown in FIGS. 1 and 2 is inserted into the bolt insertion hole 313 . When a plurality of insulating members 31 are stacked, the bolt insertion holes 313 of each insulating member 31 communicate with each other in the Z-axis direction.

In addition, hereinafter, the insulating member 31 provided at one end in the X-axis direction of the laminated structure of the storage element 20 is also referred to as the “first insulating member 31a”, and the insulating member 31 provided at the other end is referred to as the “second insulating member 31a”. 2 insulating member 31b”.
As shown in FIG. 6, the gap member 32 is a substantially rectangular parallelepiped rod-shaped member formed to extend in the Y-axis direction. The gap member 32 is made of an insulating material such as resin. One side wall portion of the gap member 32 in the X-axis direction is formed such that the width in the Z-axis direction gradually narrows toward the outside. As a result, tapered surfaces 321 are formed on both side surfaces of the side wall portion of the insulating member 31 in the Z-axis direction.

As shown in FIGS. 1 and 2, the spacing member 32 is arranged in the gap between the projections 312, 312 of the adjacent insulating members 31, 31, respectively. The gap member 32 has a shape corresponding to the gap between the convex portions 312, 312 of the adjacent insulating members 31, 31, respectively. As shown in FIG. 5 , thin portion 24 of storage element 20 is sandwiched between gap member 32 and convex portion 312 of insulating member 31 . In addition, the base ends of the electrode terminals 21 and 22 of the storage element 20 are positioned in the gap formed between the tapered surface 321 of the gap member 32 and the tapered surface 311 of the insulating member 31 .

As shown in FIG. 7, a voltage terminal 50 is sandwiched between adjacent insulating members 31,31. The voltage terminal 50 is electrically connected to the connecting portions of the electrode terminals 21 and 22 of the adjacent storage elements 20 and 20, respectively. The voltage terminal 50 is formed to protrude from the side surface of the insulating member 31 in the X-axis direction. Voltage terminal 50 is sandwiched between adjacent insulating members 31 , 31 and fixed in a state of being electrically connected to respective electrode terminals 21 , 22 of adjacent storage elements 20 , 20 .

In addition, below, the gap member 32 provided between the convex portions 312, 312 of the adjacent first insulating members 31a, 31a is also referred to as "first gap member 32a". Further, the gap member 32 provided between the projections 312, 312 of the adjacent second insulating members 31b, 31b is also called "second gap member 32b".

As shown in FIGS. 1 and 2, in the power storage device 10, the upper half of the first insulating member 31a, which is the highest among the plurality of first insulating members 31a, has a laminated structure of the power storage element 20. It protrudes above the upper end surface of the . In addition, the lower half of the lowermost first spacing member 32 a among the plurality of first spacing members 32 a protrudes below the lower end surface of the stacked structure of the storage element 20 .

Furthermore, in the power storage device 10, the lower half of the second insulating member 31b, which is the lowest among the plurality of second insulating members 31b, protrudes below the lower end surface of the stacked structure of the power storage element 20. there is In addition, the upper half of the second spacing member 32 b that is the highest among the plurality of second spacing members 32 b protrudes above the upper end face of the stacked structure of the storage element 20 .

As shown in FIGS. 1 and 2 , the upper outer wall member 33 is provided at the upper end of the laminated structure of the storage element 20 . The lower outer wall member 34 is provided at the lower end of the laminated structure of the storage element 20 . The outer wall members 33 and 34 are made of an insulating material such as resin, and are formed in a substantially rectangular parallelepiped shape. In the bottom surface of the upper outer wall member 33, an insertion groove 330 into which the uppermost first insulating member 31a is inserted and the uppermost second gap member 32b are inserted. An insertion groove 331 is formed. On the upper surface of the lower outer wall member 34, an insertion groove 340 into which the lower half of the second insulating member 31b arranged at the lowermost position is inserted, and the lower half of the first gap member 32a arranged at the lowermost position are inserted. An insertion groove 341 is formed.

As shown in FIG. 8, each corner of the upper outer wall member 33 is formed with a bolt insertion hole 332 into which a bolt 35 is inserted. Similarly, bolt insertion holes 342 into which bolts 35 are inserted are also formed at each corner of the lower outer wall member 34 . The bolt insertion holes 332 of the upper outer wall member 33 and the bolt insertion holes 342 of the lower outer wall member 34 communicate with the bolt insertion holes 313 of the insulating member 31 . 1 and 2, bolts 35 inserted into the bolt insertion holes 332 of the upper outer wall member 33, the bolt insertion holes 342 of the lower outer wall member 34, and the bolt insertion holes 313 of the insulating member 31; The upper outer wall member 33 and the lower outer wall member 34 are sandwiched in the Z-axis direction by a nut 36 screwed into the tip portion thereof. In addition, the first insulating member 31a and the second insulating member 31b are sandwiched between the upper outer wall member 33 and the lower outer wall member 34 in the Z-axis direction. Furthermore, the thin portion 24 and the first gap member 32a of the adjacent storage elements 20 are sandwiched between the convex portions 312, 312 of the first insulating members 31a, 31a. Also, the thin portion 24 and the second gap member 32b of the adjacent storage elements 20 are sandwiched between the convex portions 312, 312 of the second insulating members 31b, 31b, respectively. With such a holding structure, the laminated structure of the storage element 20, the insulating member 31, and the gap member 32 is held in the state shown in FIGS.

As shown in FIG. 9, among the electrode terminals 21 and 22 of the uppermost storage element 20a, the plate-shaped current terminal 41 is connected to the electrode terminal 22 that is not connected to the other storage elements 20a. are electrically connected. The current terminal 41 is formed to protrude from the side surface of the second insulating member 31b. The current terminal 41 is fixed in a state of being electrically connected to the electrode terminal 22 of the uppermost storage element 20a by being sandwiched between the upper outer wall member 33 and the second insulating member 31b.

Similarly, a plate-like current terminal 40 is electrically connected to the electrode terminal 21 of the lowest storage element 20b arranged at the lowest position. The current terminal 40 is formed to protrude from the side surface of the first insulating member 31a. The current terminal 40 is sandwiched between the lower outer wall member 34 and the first insulating member 31a, thereby being fixed in a state of being electrically connected to the electrode terminal 21 of the lowermost storage element 20b.

In this power storage device 10 , wires of required devices are connected to current terminals 40 and 41 . As a result, the electric storage device 10 can be discharged to a required device, and the electric storage device 10 can be charged from the required device.
In addition, in the power storage device 10, by connecting a voltage sensor to the voltage terminal 50, the voltage between the terminals of each power storage element 20 can be detected by the voltage sensor.

Next, a method for manufacturing the power storage device 10 of this embodiment will be described.
When manufacturing the power storage device 10, first, a laminated structure of the power storage element 20 and the gap member 32 as shown in FIG. 10 is formed. Specifically, a plurality of energy storage elements 20 are stacked and arranged, and a gap member 32 is arranged between the thin portions 24 of the adjacent energy storage elements 20 , 20 . Specifically, the first spacing members 32a are arranged alternately in a plurality of gaps formed between the thin portions 24, 24 formed at one ends of the plurality of storage elements 20 in the X-axis direction. Similarly, the second spacing members 32b are arranged alternately in a plurality of gaps formed between the thin portions 24, 24 formed at the other ends of the plurality of storage elements 20 in the X-axis direction. At this time, the first spacing member 32a and the second spacing member 32b are arranged so as not to face each other in the X-axis direction. In addition, the first gap member 32a is arranged so as to abut on the bottom surface of one end of the thin portion 24 of the storage element 20b arranged at the lowermost position, and the thin portion 24 of the storage element 20a arranged at the uppermost position. A second spacing member 32b is arranged so as to abut on the upper surface of the end portion. Thereby, a laminated structure of the storage element 20 and the gap member 32 as shown in FIG. 10 is formed.

Subsequently, as shown in FIG. 11, while sandwiching the voltage terminal 50 between the electrode terminals 21 and 22 of the adjacent storage elements 20, 20, among the gaps between the thin portions 24 of the plurality of storage elements 20, The insulating member 31 is assembled to the laminated structure of the storage element 20 and the spacing member 32 so that the convex portion 312 of the insulating member 31 is inserted into the gap where the spacing member 32 is not arranged. At this time, the electrode terminals 21 and 22 of the adjacent electric storage elements 20 and 20 are sandwiched between the tapered surface 321 of the gap member 32 and the tapered surface 311 of the insulating member 31 , so that the gap member 32 tapers. It deforms along the surface 321 and the tapered surface 311 of the insulating member 31 . Electrode terminals 21 and 22 of adjacent storage elements 20 and 20 are sandwiched together with voltage terminal 50 between adjacent insulating members 31 and 31, respectively. Thereby, a laminated structure of the storage element 20, the insulating member 31, and the gap member 32 as shown in FIG. 12 is formed.

Next, as shown in FIG. 12, the current terminal 40 is arranged so as to contact the electrode terminal 21 of the lowermost storage element 20b, and the current terminal 41 is arranged so as to contact the electrode terminal 22 of the uppermost storage element 20a. , the laminated structure of the storage element 20 , the insulating member 31 and the gap member 32 is sandwiched between the upper and lower outer wall members 33 and 34 . After inserting the bolt 35 into the bolt insertion hole 332 of the upper outer wall member 33 , the bolt insertion hole 342 of the lower outer wall member 34 , and the bolt insertion hole 313 of the insulating member 31 , the nut 36 is attached to the tip of the bolt 35 . By screwing, the manufacture of power storage device 10 is completed.

According to the power storage device 10 of the present embodiment described above, it is possible to obtain the actions and effects shown in (1) to (5) below.
(1) By sandwiching the plurality of insulating members 31 between the outer wall members 33 and 34, substantially uniform force can be applied to each of the plurality of insulating members 31. FIG. Therefore, since the electrode terminals 21 and 22 of the storage element 20 arranged between the adjacent insulating members 31 and 31 can be sandwiched with a substantially uniform force, any one of the plurality of storage elements 20 can be pinched. A situation in which the force for sandwiching the electrode terminals 21 and 22 of the element 20 is insufficient is less likely to occur. Therefore, it becomes possible to ensure the connection of the plurality of storage elements 20 more accurately. Further, even if a connection failure occurs in the electrode terminals 21 and 22 of one of the storage elements 20, the connection state of the storage elements 20 can be easily corrected by disassembling and reassembling the elements of the storage device 10. can do. In addition, it is possible to easily cope with the positional deviation of the electric storage element 20 or the like. Moreover, since it is not necessary to weld the electrode terminals 21 and 22 of the electric storage element 20, equipment such as a welding machine is not required in the assembly process. Therefore, the assembly cost of power storage device 10 can be reduced.

(2) The insulating member 31 has a convex portion 312 at a portion facing the storage element 20 . As a result, when the insulating member 31 is assembled to the storage element 20 , the electrode terminals 21 and 22 of the storage element 20 can be deformed by the protrusions 312 of the insulating member 31 . 21 and 22 can be easily brought into contact with each other.

(3) The power storage device 10 further includes a gap member 32 arranged between the convex portions 312, 312 of the two insulating members 31, 31 adjacent in the Z-axis direction. As a result, when the insulating member 31 is assembled to the electric storage element 20 , the electrode terminals 21 and 22 of the electric storage element 20 are sandwiched between the protrusions 312 of the insulating member 31 and the gap member 32 . It becomes easier to deform the terminals 21 and 22 . Therefore, the electrode terminals 21 and 22 of the adjacent storage elements 20 can be brought into contact with each other more easily.

(4) The gap member 32 is made of an insulating material. Thereby, unintended electrical continuity between the plurality of power storage elements 20 can be avoided.
(5) The gap member 32 has a shape corresponding to the gap between the convex portions 312, 312 of the two insulating members 31, 31 adjacent to each other in the Z-axis direction. As a result, the gaps between the projections 312, 312 of the plurality of insulating members 31, 31 can be filled with the gap member 32, so that the displacement of each member can be suppressed.

The above embodiment can also be implemented in the following forms.
- The shape of each of the insulating member 31 and the gap member 32 can be changed as appropriate. Also, the shapes of the outer wall members 33 and 34 may be appropriately changed according to those shapes.

- A plurality of storage elements 20 may be electrically connected in parallel using the structure of the storage device 10 of the above embodiment. As such a power storage device 10, for example, a structure as shown in FIG. 13 can be adopted. In the power storage device 10 shown in FIG. 13, the electrode terminals 21 of all the power storage elements 20 are arranged on the X1-axis direction side, and the electrode terminals 22 of all the power storage elements 20 are arranged on the X2-axis direction side. The power storage device 10 includes a pair of insulating members 60a and 60b that sandwich and contact the electrode terminals 21 of all the storage elements 20, and a pair of insulating members 60a that sandwich and contact the electrode terminals 22 of all the storage elements 20. , 60b. Electrode terminals 21 of all storage elements 20 are connected to current terminals 40 . Electrode terminals 22 of all storage elements 20 are connected to current terminals 41 . Furthermore, the power storage device 10 includes a plurality of power storage elements 20, insulating members 60a, 60b, 61a, 61b, and a plurality of types of gap members 70a to 70c arranged in gaps formed between the outer wall members 33, 34. It has According to such a configuration, power storage device 10 in which a plurality of power storage elements 10 are electrically connected in parallel can be realized. Note that FIG. 13 illustrates the power storage device 10 including five power storage elements 20, but the power storage device 10 may include at least two power storage elements. Moreover, the insulating members 60a and 60b may sandwich the electrode terminals of at least two storage elements.

- The present disclosure is not limited to the above specific examples. Appropriate design changes made by those skilled in the art to the above specific examples are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each specific example described above, and its arrangement, conditions, shape, etc., are not limited to those illustrated and can be changed as appropriate. As long as there is no technical contradiction, the combination of the elements included in the specific examples described above can be changed as appropriate.

10: power storage device 20: power storage elements 21, 22: electrode terminals 31, 60a, 60b: insulating members 32, 70a to 70c: gap members 33, 34 outer wall member 312: convex portion

Claims (2)

A plurality of electric storage elements having electrode terminals protruding left and right outward from both left and right sides are stacked in the vertical direction,
Insulating members for sandwiching and contacting the electrode terminals of the storage elements vertically adjacent to each other are composed of a vertically thick main body and upper and lower protruding laterally from either the left or right side wall of the main body. The electrode terminal protruding leftward has a posture in which the protruding portion faces rightward, and the electrode terminal protruding rightward has a posture in which the protruding portion faces leftward. It is stacked up and down in a facing posture,
Furthermore, a gap member made of an insulating material and having a shape corresponding to the gap is arranged in the gap between the convex portions of the insulating members that are vertically adjacent to each other,
A method for manufacturing a power storage device in which the stacked power storage elements and the insulating member are sandwiched from above and below by outer wall members ,
a first step of stacking the storage elements in the vertical direction and arranging the gap member in a predetermined gap among the gaps between the vertically adjacent electrode terminals;
The insulating member is inserted into the gap one above the gap in which the gap member is arranged and the gap one below the gap in which the gap member is arranged. By positioning the gap member in the gap between the protrusions of the insulating member, the electrode terminals above and below the gap where the gap member is arranged are connected to the surfaces of the insulating members and the gap member. and a second step of deforming along the surface and bringing the two insulating members into contact with each other while sandwiching them from above and below. In the first step, with respect to the gap on either the left or right side of the electric storage element, the gap member is arranged alternately, while with respect to the gap on the other side, the gap member is arranged on the one side. 2. The method of manufacturing a power storage device according to claim 1, wherein said gap member is arranged in said gap at a vertical position where no member is arranged.

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