JP2019185995A - Power storage device - Google Patents

Abstract

To provide a power storage device capable of ensuring a connection state of a plurality of power storage elements more accurately.SOLUTION: The power storage device 10 includes: a plurality of power storage elements 20 arranged side by side in a Z-axis direction; a plurality of insulating members 31 arranged in a stack in the Z-axis direction; and outer wall members 33, 34 that sandwich the plurality of insulating members 31 in the Z-axis direction. Each electrode terminal of two energy storage elements 20, 20 adjacent in the Z-axis direction is sandwiched by two insulating members 31, 31 adjacent to each other in the Z-axis direction and is in contact with each other.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a power storage device.

  Conventionally, there is a power storage device described in Patent Document 1 below. The power storage device described in Patent Literature 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 sandwiching the electrode terminal of one of the two energy storage elements and the electrode terminal of the other energy storage element by the clip, the slide frame is pushed into the clip to shift the position of the clip. By restricting, the electrode terminals of the two power 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 locations where the respective electrode terminals of adjacent power storage elements are connected. In addition, 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, and there is a possibility that there is a slide frame with insufficient pushing force against the clip. If there is a slide frame in which the pushing force against the clip is insufficient, the slide frame may come off the clip. When the connection of each of the electrode terminals of any two power storage elements is cut off due to the slide frame being removed from the clip, the electrical connection of the plurality of power storage elements is cut off. The function cannot be secured.

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

  A power storage device that solves the above problems includes a plurality of power storage elements arranged in a predetermined direction, a plurality of insulating members that are stacked in a predetermined direction, and an outer wall member that sandwiches the plurality of insulating members in a predetermined direction. And comprising. The electrode terminals of at least two power storage elements among the plurality of power storage elements are sandwiched and contacted between two insulating members adjacent in a predetermined direction.

  If a plurality of insulating members are sandwiched between outer wall members as in this configuration, a substantially uniform force can be applied to each of the plurality of insulating members. Therefore, the electrode terminals of the electricity storage elements arranged between adjacent insulating members can be sandwiched with a substantially uniform force, so that the force to sandwich any one of the plurality of electricity storage elements is insufficient. It becomes difficult to occur the situation. Therefore, it becomes possible to ensure the connection state of a plurality of power storage elements more accurately.

In the above power storage device, the insulating member preferably has a convex portion at a portion facing the power storage element.
According to this configuration, when the insulating member is assembled to the power storage element, the electrode terminal of the power storage element can be deformed by the convex portion of the insulating member, so that each electrode terminal of the adjacent power storage element can be easily contacted It becomes possible to make it.

In the above power storage device, it is preferable that the power storage device further includes a gap member disposed between the respective convex portions of two insulating members adjacent in a predetermined direction.
According to this configuration, when the insulating member is assembled to the power storage element, the electrode terminal of the power storage element is sandwiched between the convex portion of the insulating member and the gap member, thereby further deforming the electrode terminal of the power storage element. It becomes easy. Therefore, the electrode terminals of adjacent power storage elements can be more easily brought into contact with each other.

In the above power storage device, the gap member is preferably made of an insulating material.
According to this configuration, unintended electrical conduction between the plurality of power storage elements can be avoided.
In the above power storage device, the gap member preferably has a shape corresponding to a gap between the respective convex portions of two adjacent insulating members in a predetermined direction.

  According to this configuration, the gap between the convex portions of the plurality of insulating members can be filled with the gap member, so that the displacement of each member can be suppressed.

The power storage device preferably further includes a gap member disposed 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, the gap between the members can be filled with the gap member, so that the displacement of the members can be suppressed.

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

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

Hereinafter, an embodiment of a power storage device will be described with reference to the drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.
As illustrated in FIGS. 1 and 2, the power storage device 10 includes a plurality of power storage elements 20 and a connection member 30 that connects them in series.

  As shown in FIG. 3, the storage element 20 is a so-called laminate-type storage battery in which positive and negative electrodes alternately stacked via a separator are sealed with a laminate. As the power storage element, for example, a laminate type lithium ion battery can be used. The storage element 20 is formed in a flat shape in the direction indicated by the arrow Z. The cross-sectional shape of the electricity storage element 20 orthogonal to the Z-axis direction is substantially rectangular. The power storage element 20 has a substantially rectangular parallelepiped thick portion 23 at the center thereof, and a thin portion 24 at the outer edge of the thick portion 23. A positive electrode, a negative electrode, a separator, and the like are accommodated in the thick portion 23.

Hereinafter, the longitudinal direction of the power storage element 20 is referred to as “X-axis direction”, and the short direction of the power storage element 20 is referred to as “Y-axis direction”. Further, the Z1 axis direction which is one of the Z axis directions is also referred to as “upward direction”, and the Z2 axis direction which is the opposite direction is also referred to as “downward direction”.
Electrode terminals 21 and 22 are provided on both side surfaces of the storage element 20 in the X-axis direction, respectively. The electrode terminal 21 is one of a positive terminal and a negative terminal, and the electrode terminal 22 is either the positive terminal or the negative terminal. As illustrated 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 the present embodiment, the Z-axis direction corresponds to a predetermined direction.

As shown in FIGS. 1 and 2, the connection member 30 includes a plurality of insulating members 31, a plurality of gap members 32, and outer wall members 33 and 34.
As shown in FIG. 4, the insulating member 31 is made of a substantially rectangular parallelepiped rod-shaped member formed so as 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 decreases toward the outside. Accordingly, tapered surfaces 311 are formed on both side surfaces of the side wall portion of the insulating member 31 in the Z-axis direction. Further, a convex portion 312 is formed on the side wall portion of the insulating member 31 so as to protrude from the center portion in the Z-axis direction in the X-axis direction.

  As shown in FIGS. 1 and 2, the plurality of insulating members 31 are stacked on one end in the X-axis direction of the stacked structure of the power storage element 20 and the other end on the opposite side. . As shown in FIG. 5, the thin portion 24 of the electricity storage device 20 is disposed along the convex portion 312 of the insulating member 31, and the electrode terminal 21 of the electricity storage device 20 is along the tapered surface 311 of the insulation member 31. , 22 are arranged. Between the adjacent insulating members 31, 31, electrode terminals 21, 22 provided at one end portions of the adjacent power storage elements 20, 20 are sandwiched. Thereby, each front-end | tip part of the electrode terminals 21 and 22 provided in the one end part of the some electrical storage element 20 contacts and is electrically connected. With such a connection structure of the insulating member 31, the plurality of power storage elements 20 are electrically connected in series.

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

Hereinafter, the insulating member 31 provided at one end portion in the X-axis direction of the stacked structure of the power storage element 20 is also referred to as “first insulating member 31a”, and the insulating member 31 provided at the other end portion is referred to as “first insulating member 31”. Also referred to as “2 insulating member 31b”.
As shown in FIG. 6, the gap member 32 is formed of a substantially rectangular parallelepiped rod-shaped member formed so as 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 decreases toward the outside. Accordingly, 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 gap member 32 is disposed in a gap between the respective convex portions 312 and 312 of the adjacent insulating members 31 and 31. The gap member 32 has a shape corresponding to the gap between the convex portions 312 and 312 of the adjacent insulating members 31 and 31. As shown in FIG. 5, the thin portion 24 of the power storage element 20 is sandwiched between the gap member 32 and the convex portion 312 of the insulating member 31. In addition, in the gap formed between the tapered surface 321 of the gap member 32 and the tapered surface 311 of the insulating member 31, the respective base end portions of the electrode terminals 21 and 22 of the power storage element 20 are located.

  As shown in FIG. 7, the voltage terminal 50 is sandwiched between the adjacent insulating members 31 and 31. The voltage terminal 50 is electrically connected to a connection portion between the electrode terminals 21 and 22 of the adjacent power storage elements 20 and 20. The voltage terminal 50 is formed so as to protrude from the side surface of the insulating member 31 in the X-axis direction. The voltage terminal 50 is fixed while being electrically connected to the respective electrode terminals 21 and 22 of the adjacent power storage elements 20 and 20 by being sandwiched between the adjacent insulating members 31 and 31.

  Hereinafter, the gap member 32 provided between the convex portions 312 and 312 of the adjacent first insulating members 31a and 31a is also referred to as a “first gap member 32a”. Further, the gap member 32 provided between the convex portions 312 and 312 of the adjacent second insulating members 31b and 31b is also referred to as a “second gap member 32b”.

  As shown in FIGS. 1 and 2, in the power storage device 10, among the plurality of first insulating members 31 a, the upper half of the first insulating member 31 a disposed at the uppermost position is a stacked structure of the power storage elements 20. It protrudes upward from the upper end surface of. Further, among the plurality of first gap members 32 a, the lower half of the lowermost first gap member 32 a protrudes below the lower end surface of the stacked structure of the electricity storage device 20.

  Further, in the power storage device 10, the lower half of the second insulating member 31 b disposed at the lowermost of the plurality of second insulating members 31 b protrudes below the lower end surface of the stacked structure of the power storage element 20. Yes. Further, among the plurality of second gap members 32 b, the upper half of the uppermost second gap member 32 b protrudes above the upper end surface of the stacked structure of the electricity storage device 20.

  As shown in FIGS. 1 and 2, the upper outer wall member 33 is provided at the upper end portion of the stacked structure of the power storage elements 20. The lower outer wall member 34 is provided at the lower end of the stacked structure of the power storage elements 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 upper half of the first insulating member 31a disposed at the uppermost position is inserted and an upper half of the second gap member 32b disposed at the uppermost position are inserted. An insertion groove 331 is formed. On the upper surface of the lower outer wall member 34, the insertion groove 340 into which the lower half of the second insulating member 31b disposed at the lowermost position is inserted, and the lower half of the first gap member 32a disposed at the lowermost position are inserted. An insertion groove 341 is formed.

  As shown in FIG. 8, bolt insertion holes 332 into which the bolts 35 are inserted are formed at the respective corners of the upper outer wall member 33. Similarly, bolt insertion holes 342 into which the bolts 35 are inserted are also formed at the respective corners of the lower outer wall member 34. The bolt insertion hole 332 of the upper outer wall member 33 and the bolt insertion hole 342 of the lower outer wall member 34 are communicated with the bolt insertion hole 313 of the insulating member 31. As shown in FIGS. 1 and 2, a bolt 35 inserted into a bolt insertion hole 332 of the upper outer wall member 33, a bolt insertion hole 342 of the lower outer wall member 34, and a bolt insertion hole 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 the nut 36 screwed into the tip portion. 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. Further, the thin portion 24 and the first gap member 32a of the adjacent storage element 20 are sandwiched between the respective convex portions 312 and 312 of the first insulating members 31a and 31a. Further, the thin portion 24 and the second gap member 32b of the adjacent power storage element 20 are sandwiched between the respective convex portions 312 and 312 of the second insulating members 31b and 31b. With such a sandwiching structure, the laminated structure of the power 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 20 a disposed at the uppermost position, the electrode terminal 22 not connected to the other storage element 20 has a plate-like current terminal 41. Are electrically connected. The current terminal 41 is formed so as 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 power 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 lowermost storage element 20b arranged at the lowermost position. The current terminal 40 is formed so as to protrude from the side surface of the first insulating member 31a. The current terminal 40 is fixed in a state of being electrically connected to the electrode terminal 21 of the lowermost storage element 20b by being sandwiched between the lower outer wall member 34 and the first insulating member 31a.

In the power storage device 10, required equipment wiring is connected to the current terminals 40 and 41. Thereby, discharging from the power storage device 10 to a required device and charging from the required device to the power storage device 10 are possible.
Further, 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 the present embodiment will be described.
When the power storage device 10 is manufactured, first, a stacked structure of the power storage element 20 and the gap member 32 as shown in FIG. 10 is formed. Specifically, the plurality of power storage elements 20 are stacked and disposed, and the gap member 32 is disposed in the gap between the thin portions 24 of the adjacent power storage elements 20 and 20. Specifically, every other first gap member 32a is arranged in a plurality of gaps formed between the thin portions 24, 24 formed at one end of the plurality of power storage elements 20 in the X-axis direction. Similarly, every other second gap member 32b is arranged in a plurality of gaps formed between the thin portions 24, 24 formed at the other ends of the plurality of power storage elements 20 in the X-axis direction. At this time, the first gap member 32a and the second gap member 32b are arranged so as not to face each other in the X-axis direction. Further, the first gap member 32a is disposed so as to contact the bottom surface of one end portion of the thin portion 24 of the power storage element 20b disposed at the lowermost position, and other than the thin portion 24 of the power storage element 20a disposed at the uppermost position. The second gap member 32b is disposed so as to contact the upper surface of the end portion. Thereby, the laminated structure of the electrical storage element 20 and the gap member 32 as shown in FIG. 10 is formed.

  Subsequently, as illustrated in FIG. 11, while sandwiching the voltage terminal 50 between the electrode terminals 21 and 22 of the adjacent power storage elements 20 and 20, among the gaps of the thin portions 24 of the plurality of power storage elements 20, The insulating member 31 is assembled to the stacked structure of the power storage element 20 and the gap member 32 so that the convex portion 312 of the insulating member 31 is inserted into the gap where the gap member 32 is not disposed. At this time, the electrode terminals 21 and 22 of the adjacent power storage elements 20 and 20 are sandwiched between the taper surface 321 of the gap member 32 and the taper surface 311 of the insulating member 31, thereby tapering the gap member 32. It deforms along the surface 321 and the tapered surface 311 of the insulating member 31. Then, the electrode terminals 21 and 22 of the adjacent power storage elements 20 and 20 are sandwiched together with the voltage terminal 50 between the adjacent insulating members 31 and 31. Thereby, the laminated structure of the electrical 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 be in contact with the electrode terminal 21 of the lowermost-stage power storage element 20b, and the current terminal 41 is brought into contact with the electrode terminal 22 of the uppermost-stage power storage element 20a. After that, the laminated structure of the power storage element 20, the insulating member 31, and the gap member 32 is sandwiched between the upper outer wall member 33 and the lower outer wall member 34. Then, 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, a nut 36 is attached to the tip of the bolt 35. By screwing, the manufacture of the power storage device 10 is completed.

According to the power storage device 10 of the present embodiment described above, the operations and effects shown in the following (1) to (5) can be obtained.
(1) If the plurality of insulating members 31 are sandwiched between the outer wall members 33 and 34, a substantially uniform force can be applied to each of the plurality of insulating members 31. Therefore, since the electrode terminals 21 and 22 of the electricity storage element 20 arranged between the adjacent insulating members 31 and 31 can be sandwiched with a substantially uniform force, any one of the electricity storage elements 20 of the plurality of electricity storage elements 20 is stored. It is difficult to generate a situation where the force for sandwiching the electrode terminals 21 and 22 of the element 20 is insufficient. Therefore, it is possible to ensure the connection of the plurality of power storage elements 20 more accurately. Even if a connection failure occurs in the electrode terminals 21 and 22 of any one of the energy storage elements 20, if the elements of the energy storage device 10 are disassembled and reassembled, the connection state of these energy storage elements 20 is easily corrected. can do. In addition, it is possible to easily cope with a positional deviation of the power storage element 20. Moreover, since it is not necessary to weld the electrode terminals 21 and 22 of the electrical storage element 20, facilities, such as a welding machine, become unnecessary in the assembly process. Therefore, the assembly cost of the power storage device 10 can be reduced.

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

  (3) The power storage device 10 further includes a gap member 32 disposed between the respective convex portions 312 and 312 of the two insulating members 31 and 31 adjacent in the Z-axis direction. Thus, when the insulating member 31 is assembled to the power storage element 20, the electrode terminals 21 and 22 of the power storage element 20 are sandwiched between the convex portion 312 and the gap member 32 of the insulating member 31, thereby The terminals 21 and 22 are further easily deformed. Therefore, the electrode terminals 21 and 22 of the adjacent power storage elements 20 can be more easily brought into contact with each other.

(4) The gap member 32 is made of an insulating material. Thereby, unintended electrical conduction 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 and 312 of the two insulating members 31 and 31 adjacent in the Z-axis direction. Thereby, since the clearance gap between each convex part 312 and 312 of the some insulating members 31 and 31 can be filled up with the gap | interval member 32, position shift of each member can be suppressed.

In addition, the said embodiment can also be implemented with the following forms.
-Each shape of the insulating member 31 and the gap | interval member 32 can be changed suitably. Moreover, you may change suitably the shape of the outer wall members 33 and 34 according to those shapes.

  -You may connect the some electrical storage element 20 electrically in parallel using the structure of the electrical storage apparatus 10 of the said 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 power storage elements 20, and a pair of insulating members 60a that sandwich and contact the electrode terminals 22 of all the power storage elements 20. , 60b. The electrode terminals 21 of all the storage elements 20 are connected to the current terminal 40. Further, the electrode terminals 22 of all the power storage elements 20 are connected to the current terminal 41. Further, the power storage device 10 includes a plurality of types of gap members 70a to 70c arranged in a gap formed between the plurality of power storage elements 20, the insulating members 60a, 60b, 61a, 61b, and the outer wall members 33, 34. It has. According to such a configuration, it is possible to realize a power storage device 10 in which a plurality of power storage elements 10 are electrically connected in parallel. 13 illustrates the power storage device 10 including the five power storage elements 20, the power storage device 10 only needs to include at least two power storage elements. The insulating members 60a and 60b may be any member that sandwiches the electrode terminals of at least two power storage elements.

  -This indication is not limited to said specific example. Any of the above specific examples that are appropriately modified by those skilled in the art 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 of the specific examples described above, and the arrangement, conditions, shape, and the like thereof are not limited to those illustrated, and can be appropriately changed. Each element included in each of the specific examples described above can be appropriately combined as long as no technical contradiction occurs.

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 (7)

A plurality of power storage elements arranged side by side in a predetermined direction;
A plurality of insulating members that are stacked in the predetermined direction;
An outer wall member that sandwiches the plurality of insulating members in the predetermined direction,
The power storage device in which electrode terminals of at least two power storage elements among the plurality of power storage elements are sandwiched and contacted between two insulating members adjacent in the predetermined direction. The power storage device according to claim 1, wherein the insulating member has a convex portion at a portion facing the power storage element. The power storage device according to claim 2, further comprising a gap member disposed between the convex portions of each of two insulating members adjacent in the predetermined direction. The power storage device according to claim 3, wherein the gap member is made of an insulating material. The power storage device according to claim 3, wherein the gap member has a shape corresponding to a gap between each of the convex portions of two insulating members adjacent in the predetermined direction. The power storage device according to claim 1, further comprising a gap member disposed in a gap formed between the plurality of power storage elements, the plurality of insulating members, and the outer wall member. The power storage device according to claim 6, wherein the gap member is made of an insulating material.

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