JP5765259B2 - Electrode storage separator, electrode body, power storage device, and vehicle - Google Patents

Description

  The present invention relates to an electrode storage separator having an electrode stored therein, an electrode body, a power storage device, and a vehicle.

  As is well known, rechargeable secondary batteries can be used repeatedly, and are therefore widely used in various devices and apparatuses. In the field of vehicles, the use of fossil fuels (reduction of carbon dioxide emissions) is required, so vehicles that use this type of secondary battery as a motor power source, so-called hybrid vehicles and EV vehicles (Electric Vehicle vehicles) ) And so on. In such a secondary battery, charging and discharging with a large current and an increase in battery capacity are required. For example, lithium ion secondary batteries are mass-produced as products.

  As a secondary battery of this type, for example, a secondary battery having a laminated structure in which a positive electrode sheet, a negative electrode sheet, and a separator that insulates them are alternately stacked to form an electrode body is well known. However, since the laminated structure undergoes a manufacturing process in which the positive electrode sheet, the negative electrode sheet, and the separator are sequentially stacked, the number of stacking processes increases. Therefore, there is a problem that productivity is not good. In view of this, for example, a technique has been devised in which the positive electrode sheet is stored in the bag-shaped separator in advance, thereby reducing the number of the above-described stacking steps and improving battery productivity (see Patent Document 1 and the like).

JP 2003-92100 A

  Incidentally, in recent years, there is a need to use a ceramic separator whose both surfaces are coated with ceramics for the purpose of improving durability against heat shrinkage. However, in the case of a bag-like separator, it is necessary to form a bag-like shape by, for example, welding the stacked separators. However, since both sides of the ceramic separator are coated with ceramics, the sheets are bonded together by welding or the like. There is no current situation. Therefore, there has been a need for development of a technology that can be formed into a bag shape even with a ceramic separator.

  An object of the present invention is to provide an electrode storage separator, an electrode body, a power storage device, and a vehicle capable of firmly assembling and fixing a first sheet surface and a second sheet surface coated with ceramics.

In order to solve the above-mentioned problem, in claim 1, in an electrode storage separator in which an electrode is sandwiched between separators having a first sheet surface and a second sheet surface facing each other coated with ceramics, the electrode is formed on the first sheet surface. And a locking piece formed on the second sheet surface and inserted into the cutting portion, the locking piece outwardly from an edge around the separator. The gist is that it protrudes .

According to the structure of this invention, even if the 1st sheet surface and the 2nd sheet surface are ceramic separators, these are piled up, and it is made into a locked state by a mutual locking piece and a notch part, and is integrated. It can be assembled. Further, in the case of the present invention, since there is no shape deformation such as complicated bending of the locking piece, the locking piece is simply stopped at the cut portion. The state is easily maintained. Therefore, it is possible to maintain the separator in an assembled state for a long period of time. In addition, since the periphery of the first sheet surface can be omitted, the size of the separator can be reduced by the amount of the omitted portion.

  According to a second aspect of the present invention, the gist of the invention of the first aspect is that a plurality of the locking pieces and the cut portions are formed and arranged on both sides in the surface direction of the electrode. According to this configuration, since the positioning is performed by the locking pieces and the cut portions on both sides in the surface direction of the electrode, the effect of preventing the displacement of the electrode inside the electrode storage separator is enhanced.

According to a third aspect of the present invention, in the invention according to the first or second aspect , the set of the locking pieces and the cut portions that are stacked as an electrode body are alternately arranged in units of the stacked layers. The gist is that they are arranged at different positions. According to this configuration, in the electrode body formed by alternately stacking the electrode storage separator and the electrode, the locking piece and the cut portion are not bulky.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the first sheet surface is one surface formed by folding back one separator sheet, and the second surface. The gist of the sheet surface is the other surface formed by folding the one separator sheet. According to this configuration, the electrode storage separator can be assembled by a simple operation of folding back one separator sheet.

According to a fifth aspect of the invention, in the invention according to any one of the first to third aspects, the first sheet surface and the second sheet surface are superposed separate sheet surfaces. . According to this configuration, even if the first sheet surface and the second sheet surface are separate sheets, they can be manufactured as an electrode storage separator by overlapping them.

A sixth aspect of the present invention is summarized in that, in the invention according to any one of the first to fifth aspects, the electrode is a positive electrode. According to this configuration, for example, the outer dimension of the electrode storage separator and the outer dimension of the negative electrode can be matched, so that the electrode storage separator and the negative electrode are alternately stacked when the electrode body is assembled. It becomes easy to align the position.

According to claim 7, and summarized in that an electrode body comprising an electrode housing separator according to any one of claims 1-6.
According to claim 8, and summarized in that a power storage device comprising an electrode body according to claim 7.

A ninth aspect of the present invention is a vehicle including the power storage device according to the eighth aspect .

  According to the present invention, the first sheet surface and the second sheet surface coated with ceramics can be firmly assembled and fixed.

The disassembled perspective view which shows the structure of the secondary battery of 1st Embodiment. The perspective view which shows the external appearance of a secondary battery. The disassembled perspective view which shows the structure of an electrode body. Sectional drawing which shows the location where the lead was welded in the current collection part. (A) is a top view of the separator sheet before bending, (b) is a side view of the separator sheet before bending. The perspective view which shows the tongue piece and the hole part which were punched and formed in the separator sheet. Explanatory drawing which shows a mode that a tongue piece is inserted in a slit part. Explanatory drawing which shows the state which supported the positive electrode sheet in the base part of the tongue piece. (A)-(e) is explanatory drawing which shows the assembly process of an electrode storage bag-shaped separator. The perspective view which shows the shape of the separator sheet of 2nd Embodiment. The electrode storage bag-shaped separator of 3rd Embodiment is shown, (a) is the top view, (b) is a perspective view which shows the lamination | stacking state of an electrode storage bag-shaped separator and a negative electrode sheet. Schematic which shows the electrode storage bag-shaped separator of 4th Embodiment. The elements on larger scale of the tongue piece and slit part in another example. Schematic which shows the electrode storage bag-shaped separator of another example.

(First embodiment)
Hereinafter, a first embodiment of an electrode storage separator, an electrode body, a power storage device, and a vehicle embodying the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, for example, in a vehicle 1 (shown in FIG. 2) such as a hybrid vehicle (plug-in hybrid vehicle) or an EV vehicle, a motor (not shown) used as a drive source of the vehicle 1 is used. A secondary battery 2 is mounted as a power source. For example, a metal case 3 is provided in the secondary battery 2, and an electrode body 5, which is a power generation element, is accommodated inside the case body 4. The upper opening 4a of the case body 4 is sealed in a sealed state by a metal plate-like case lid 6. Note that the secondary battery 2 corresponds to a power storage device.

  As shown in FIG. 2, a positive electrode terminal 7 that is an electrode terminal for a positive electrode and a negative electrode terminal 8 that is an electrode terminal for a negative electrode are provided on the upper surface of the secondary battery 2. The positive terminal 7 and the negative terminal 8 are exposed to the outside of the case 3 through the opening hole 6 a of the case lid 6. Ring-shaped insulating members 9 that insulate the positive terminal 7 and the negative terminal 8 from the case 3 are attached between the positive terminal 7 and the negative terminal 8 and the case 3.

  As shown in FIG. 3, the electrode body 5 includes a layer composed of a bag-like separator (hereinafter referred to as an electrode-containing bag-like separator 10) in which an electrode (positive electrode) is housed in a bag, and a thin negative electrode sheet 11 that serves as a negative electrode. It consists of an assembly with multiple layers. The electrode storage bag-shaped separator 10 is a member in which a thin positive electrode sheet 13 serving as a positive electrode is stored in a bag-shaped separator body 12. The electrode body 5 has a stacked structure in which the electrode storage bag-shaped separator 10 and the negative electrode sheet 11 are stacked in a certain direction along the thickness direction of the electrode body 5 (stacking direction: Y-axis direction in FIG. 1 and the like). The negative electrode sheet 11 and the positive electrode sheet 13 constitute an electrode. The negative electrode sheet 11 and the positive electrode sheet 13 constitute positive and negative electrodes.

  The positive electrode sheet 13 is provided with a metal sheet-like foil 14, and the positive electrode active material layer 15 is applied to both surfaces of the foil 14, and this portion is formed as a coating portion 16. A part of the foil 14 is drawn out as a tab on a part of the periphery of the positive electrode sheet 13, and this part is formed as an uncoated part 17 where the positive electrode active material layer 15 is not applied. The negative electrode sheet 11 is also provided with a metal sheet-like foil 18, and the negative electrode active material layer 19 is applied to both surfaces of the foil 18, and the coated part 20 and the uncoated part 21 are formed in the same manner as the positive electrode sheet 13. Has been.

  As shown in FIGS. 1 and 4, each of the positive electrode sheet 13 and the negative electrode sheet 11 has a lead in each current collecting part 22, 23 in which uncoated parts 17, 21 having the same polarity are bundled in the stacking direction Y. 24 and 25 are welded. The positive electrode lead 24 and the negative electrode lead 25 are fixed to the current collectors 22 and 23 with the vicinity of the roots of the current collectors 22 and 23 as welds 26 and 27. Further, the positive terminal 7 is connected to the positive lead 24 and the negative terminal 8 is connected to the negative lead 25. The current collectors 22 and 23 protrude upward from the upper surface of the electrode pair 28 which is the main body of the electrode body 5, and are positioned closer to the ends on the side away from each other in the width direction of the electrode pair 28 (X-axis direction in FIG. 1) Is arranged.

  As shown in FIG. 5A, the electrode storage bag-shaped separator 10 can be formed into a bag shape by folding one separator sheet 29 around the center as a bent portion 30. In the case of this example, in the separator sheet 29, one side (upper side of the drawing in FIG. 5) from the bent portion 30 is the first sheet surface 31, and the other side from the bent portion 30 (lower side of the drawing in FIG. 5) is the second sheet surface. 32. The first sheet surface 31 and the second sheet surface 32 are disposed to face each other. In the case of this example, the first sheet surface 31 and the second sheet surface 32 are formed to have substantially the same size.

  As shown in FIG. 5 (b), ceramics are applied to both the front and back surfaces of the sheet base material 29a of the separator sheet 29 in substantially the entire region, so that this portion is formed as a ceramic coating portion 33. ing. Thus, the electrode storage bag-shaped separator 10 of this example becomes a ceramic separator by being coated with ceramics on both sides, and has high durability against heat shrinkage.

  As shown in FIG. 5 (a), a plurality of tongue pieces 34 having a substantially arrow shape are formed on the first sheet surface 31 on both the left and right sides in the sheet width direction (X-axis direction: electrode surface direction). Yes. The punching is a kind of manufacturing method in which a sheet is cut to obtain a desired shape. Four tongue pieces 34 in this example are formed, two on each of the left and right sides in the sheet width direction. The tongue piece 34 is disposed at a position near the edge of each of the left and right sides of the separator sheet 29, and is formed so as to be directed toward the edge, that is, outward. That is, the two tongue pieces 34a and 34b on the right side of the paper surface are disposed so as to protrude outward from the edge of the separator sheet 29 (in this example, protrude on the right side of the paper surface), and the two tongue pieces 34c and 34d on the left side of the paper surface. Also, the separator sheet 29 is disposed so as to protrude outward from the edge of the separator sheet 29 (in this example, it protrudes to the left side of the drawing). Further, the tongue pieces 34a and 34b and the tongue pieces 34c and 34d are oriented so as to protrude in opposite directions. As shown in FIG. 6, when the tongue piece 34 is turned on the first sheet surface 31, the turned portion appears as a hole 35. The tongue piece 34 (34a to 34d) corresponds to a locking piece.

  As shown in FIGS. 5 and 7, the second sheet surface 32 is formed with a plurality of slit portions 36 into which the tongue pieces 34 can be inserted after the separator sheet 29 is folded back. A total of four slit portions 36 of this example are formed, two on each side of the sheet width direction. The slit portion 36 is a cut (cut) extending in the sheet vertical direction (Z-axis direction in FIG. 5). In this example, the tongue piece 34a can be inserted into the slit portion 36a, the tongue piece 34b can be inserted into the slit portion 36b, the tongue piece 34c can be inserted into the slit portion 36c, and the tongue piece 34d can be inserted into the slit portion 36d. In addition, the slit part 36 (36a-36d) is equivalent to a notch part.

  As shown in FIG. 3 and FIG. 5A, a total of four sets of tongue pieces 34 and slit portions 36 are formed, two on each of the left and right sides of the positive electrode sheet 13 housed in the separator body 12. Yes. The positive electrode sheet 13 in the electrode storage bag-shaped separator 10 is stored in a storage portion 37 formed by folding the separator sheet 29. At this time, the positive electrode sheet 13 in the housed state is restricted from moving in the sheet width direction (X-axis direction in FIG. 3) by the set of the tongue piece 34 and the slit portion 36. Further, the positive electrode sheet 13 in the accommodated state is restricted by the bent portion 30 of the separator sheet 29 from moving downward in the drawing (the −Z axis direction in FIG. 3).

  As shown in FIG. 8, when the positive electrode sheet 13 is stored in the storage portion 37, the peripheral portion of the positive electrode sheet 13 is supported by the root portion 42 of the tongue piece 34. For this reason, when the tongue piece 34 is formed in the separator sheet 29, the peripheral edge of the positive electrode sheet 13 is supported by the root portion 42 even if the hole 35 is formed in the separator sheet 29. Is not exposed to the outside through the hole 35. For this reason, when the electrode storage bag-shaped separator 10 and the negative electrode sheet 11 are laminated | stacked alternately, the positive electrode sheet 13 and the negative electrode sheet 11 do not contact.

Next, the manufacturing process of the electrode storage bag separator 10 of this example is demonstrated using FIG.
As shown in FIG. 9A to FIG. 9B, in the separator manufacturing process, one separator sheet 29 whose surface is ceramic-coated is folded back along the central bent portion 30 to obtain a first sheet surface 31. And the second sheet surface 32 are overlapped. And as shown in FIG.9 (c), the separator sheet 29 is made into a bag shape by inserting each tongue piece 34a-34d in each slit part 36a-36d which opposes. At this time, since the tongue piece 34 is simply inserted into the slit portion 36 without being bent, the tongue piece 34 can be easily inserted into the slit portion 36.

  Subsequently, as shown in FIG. 9 (d), the positive electrode sheet 13 is inserted into the separator body 12 from the opening 41 formed in the upper portion of the separator body 12, and as shown in FIG. 9 (e), The positive electrode sheet 13 is stored in the storage unit 37 in the separator body 12. As shown in the enlarged circle of FIG. 9 (e), the back surface of the peripheral edge of the positive electrode sheet 13 is supported by the root portions 42 of the tongue pieces 34 a to 34 d, so that the positive electrode sheet 13 is not exposed from the hole portion 35. Therefore, the possibility that the positive electrode sheet 13 is in contact with the negative electrode sheet 11 on the back surface is reduced. Thus, the electrode storage bag-like separator 10 is manufactured one by one.

  Subsequently, in the stacking step, the electrode storage bag-shaped separator 10 and the negative electrode sheet 11 are alternately stacked. Then, after overlapping the required number, uncoated portions 17 and 21 having the same polarity are bundled together, the leads 24 and 25 are welded, and the electrode body 5 is assembled. After the electrode body 5 is assembled, the electrode body 5 is accommodated in the case body 4, and the opening 4 a of the case body 4 is closed with the case lid 6, whereby the secondary battery 2 is assembled.

  By the way, the separator sheet 29 whose both surfaces are coated with ceramics is more rigid than a normal separator. Therefore, when the tongue piece 34 is locked to the slit portion 36, a large bending is imposed on the tongue piece 34 temporarily. The tongue piece 34 is difficult to bend and the bent state is not kept. Therefore, when a single separator sheet 29 is folded and formed into a bag shape, if the tongue piece 34 is bent and stopped, the tongue piece 34 is not firmly fixed to the other side, leading to a possibility that the bag state cannot be maintained. .

  Therefore, in this example, the tongue piece 34 that has been punched into the separator sheet 29 is simply inserted into the slit portion 36 on the other side. It is possible to stop. Therefore, since it becomes easy to maintain the latching state of the tongue piece 34 and the slit part 36, it becomes possible to ensure the bag state of the electrode storage bag-shaped separator 10. FIG.

  Here, when the tongue piece 34 is formed in the separator sheet 29 by punching, a hole 35 is formed in the punched portion, so that the stored positive electrode sheet 13 is temporarily exposed from the hole 35. There is a possibility of contact with the negative electrode sheet 11 located on the back side. However, in the case of this example, the edge of the positive electrode sheet 13 can be supported from the back surface by the root portion 42 of the tongue piece 34 by setting the protruding direction of the tongue piece 34 to the outside in the sheet width direction. 13 is not exposed from the hole 35. Therefore, contact between the positive electrode sheet 13 and the negative electrode sheet 11 can be avoided.

According to the configuration of the present embodiment, the following effects can be obtained.
(1) A plurality of sets of tongue pieces 34 and slit portions 36 are formed on a separator sheet 29 whose both surfaces are coated with ceramics, the separator sheet 29 is folded, and the tongue pieces 34 are inserted into the slit portions 36, whereby the separator The sheet 29 is fixed in a bag shape. Therefore, even if a ceramic separator is used, the separator sheet 29 can be closed in a bag shape. In addition, since this type of ceramic separator has rigidity, it is difficult to bend the tongue piece 34, but the tongue piece 34 is simply inserted into the slit portion 36 as it is. However, the locked state between the tongue piece 34 and the slit portion 36 is easily maintained. Therefore, the separator sheet 29 can be maintained over a long period in a bag shape. Further, the positive electrode sheet 13 in the bag is supported from the back surface by the root portion 42 of the tongue piece 34 in the stored state. Therefore, since the positive electrode sheet 13 is hardly exposed to the outside from the hole 35 formed in the separator sheet 29 by forming the tongue piece 34, the insulation between the positive electrode sheet 13 in the bag and the negative electrode sheet 11 outside the bag is ensured. You can also

  (2) The positive electrode (positive electrode sheet 13) of the positive and negative electrodes is stored in the electrode storage bag-shaped separator 10. By the way, in this kind of electrode body 5, it is necessary to form a negative electrode larger than a positive electrode on the relationship of the exchange of the ion between electrodes. For this reason, if the positive electrode is stored inside the electrode storage bag-shaped separator 10 as in this example, as a result, the outer dimension of the electrode storage bag-shaped separator 10 and the outer dimension of the negative electrode sheet 11 are the same. It can take the dimension to do. Therefore, when the electrode body 5 is assembled, alignment when the electrode storage bag-shaped separator 10 and the negative electrode sheet 11 are alternately stacked is facilitated. In addition, the stacked electrode storage bag-shaped separator 10 and the negative electrode sheet 11 are not easily displaced in the electrode body 5.

  (3) A set of the tongue piece 34 and the slit portion 36 is provided on both sides in the sheet width direction (X-axis direction in FIG. 5 and the like). Therefore, since the positive electrode sheet 13 can be sandwiched and supported by the set of the tongue piece 34 and the slit portion 36 from both sides in the sheet width direction, it is possible to prevent the positional deviation of the positive electrode sheet 13 in the sheet width direction.

(4) Since the tongue piece 34 and the slit portion 36 are disposed near the edge of the separator sheet 29, the tongue piece 34 and the slit portion 36 do not interfere with the positive electrode sheet 13.
(5) Since one separator sheet 29 is folded back and formed into a bag shape, the electrode storage bag-shaped separator 10 can be manufactured by a simple operation of simply folding one sheet.

(6) Since the tongue piece 34 has an arrow shape, the tongue piece 34 inserted into the slit portion 36 can be hardly detached from the slit portion 36 by being caught.
(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. In addition, 2nd Embodiment is an Example which changed the shape of the separator sheet 29, Comprising: Other basic structures are the same. Therefore, the same parts as those in the first embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and only different parts will be described.

  As shown in FIG. 10, on both sides of the separator sheet 29 in the sheet width direction (X-axis direction in FIG. 10), left and right peripheral portions are omitted by a predetermined length, so that omitted portions 45 are formed. . Thereby, the size of the separator sheet 29 in the sheet width direction is formed to the minimum necessary size. Each tongue piece 34 of the present example has a shape that protrudes laterally from the edge of the sheet by forming omitted portions 45 on the left and right sides of the separator sheet 29.

According to the configuration of the present embodiment, the following effects can be obtained in addition to (1) to (6) of the first embodiment.
(7) Since the size of the separator sheet 29 can be minimized, the size of the electrode body 5 can be reduced. Therefore, it contributes to the reduction of the dead space in the case 3 and the effect of securing the energy density of the secondary battery 2 is enhanced.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG. In the third embodiment, only the parts different from the first embodiment will be described in detail.

  As shown in FIG. 11A, among the plurality of electrode storage bag-like separators 10 stacked as the electrode body 5, the sets of tongue pieces 34 and slit portions 36 are alternately stacked in units of stacked layers. The position is shifted in the direction of the surface. In this example, the sets of the tongue pieces 34 and the slit portions 36 are alternately arranged with odd-numbered sheets and even-numbered sheets. Specifically, in the odd-numbered electrode storage bag-shaped separator 10, the set of the tongue piece 34 and the slit portion 36 has the uncoated portion 17 in the sheet height direction (Z-axis direction in FIG. 11A). It is arranged at a close position. On the other hand, the even-numbered electrode-accommodating bag-shaped separator 10 is such that the tongue piece 34 and the slit 36 are separated from the uncoated part 17 in the sheet height direction (Z-axis direction in FIG. 11A). It is arranged at the position.

  As shown in FIG. 11B, when assembling the electrode body 5, the electrode storage bag-shaped separator 10 and the negative electrode sheet 11 are alternately stacked. In the separator 10 and the even-numbered electrode storage bag-shaped separator 10, the set of the tongue piece 34 and the slit portion 36 are arranged so as not to be overlapped with each other. Therefore, since the thickness of the overlapping part of the tongue piece 34 and the slit part 36 is dispersed, it is possible to suppress the bulk when the sheet groups are overlapped.

According to the configuration of the present embodiment, the following effects can be obtained in addition to (1) to (6) of the first embodiment.
(8) Since the positions of the tongue pieces 34 and the slit portions 36 of the electrode storage bag-shaped separator 10 are shifted between the odd-numbered sheets and the even-numbered sheets, the tongue pieces 34 and the slit sections when the sheet groups are stacked The bulkiness of 36 can be kept thin.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIG. In the third embodiment, only the parts different from the first embodiment will be described in detail.

  As shown in FIG. 12, the electrode storage bag-like separator 10 of this example has two sheets (first sheet surface 31 and second sheet surface 32), which are separate sheets, and the tongue piece 34 is slit. By being inserted into the portion 36, it is formed in a bag shape. In the case of this example, a total of six are formed, two at each of the left end, the right end, and the bottom end of the first sheet surface 31. Further, a total of six are formed, two at each of the left end, the right end, and the bottom end of the second sheet surface 32. Moreover, the tongue piece 34 of this example is formed not in the shape of an arrow but in a simple square shape.

  And in the case of this example, the 1st sheet surface 31 and the 2nd sheet surface 32 are made into a bag shape by hooking the tongue piece 34 and slit part 36 which make a group. The positive electrode sheet 13 in the housed state is positioned in the sheet width direction by a total of four sets of tongue pieces 34 and slit portions 36 located on the left and right sides of the sheet. Further, the positive electrode sheet 13 in the accommodated state is positioned in the sheet downward direction by a total of two sets of the tongue piece 34 and the slit portion 36 located at the lower end of the paper surface. Accordingly, the position of the positive electrode sheet 13 is set inside the electrode housing bag-shaped separator 10.

According to the configuration of the present embodiment, the following effects can be obtained in addition to (1) to (5) of the first embodiment.
(9) Not only one large separator sheet 29 but also two separate sheet members can be stacked to produce the electrode storage bag-shaped separator 10.

Note that the embodiment is not limited to the configuration described so far, and may be modified as follows.
-In each embodiment, the group of the tongue piece 34 and the slit part 36 is not limited to the pattern which changes a position by 2 types, an even-numbered sheet and an odd-numbered sheet. As shown in FIG. 13, it is possible to further reduce the bulk by dispersing the arrangement positions of the tongue piece 34 and the slit portion 36 in three or more places (three places in the example of FIG. 13).

  -In each embodiment, the tongue piece 34 and the slit part 36 are not limited to being provided in the edge part of the sheet surface right and left. As shown in FIG. 14, taking a modification of the fourth embodiment as an example, it may be provided on each of the upper and lower sides in the sheet height direction (Z-axis direction: electrode surface direction) as shown in the same figure.

  In each embodiment, the set of the positive electrode sheet 13 is not limited to the assembly order in which the separator sheet 29 is formed into a bag shape and then inserted into the storage portion 37 in the separator body 12. For example, the assembly order may be such that after the positive electrode sheet 13 is set on the separator sheet 29 before being folded, the separator sheet 29 is folded and formed into a bag shape.

-In each embodiment, the number and arrangement | positioning location of the set of the tongue piece 34 and the slit part 36 can be suitably changed into a different number and location as needed.
In each embodiment, the shape of the tongue piece 34 is not limited to the arrow shape or the square shape, and may be changed to another shape such as a triangular shape.

In each embodiment, the ceramic separator may be a ceramic-coated sheet only on one side of the sheet.
In each embodiment, the positive electrode terminal 7 and the negative electrode terminal 8 are not limited to being arranged on the same side of the electrode pair 28, and may be arranged on different sides.

-In each embodiment, the arrangement position of the current collection parts 22 and 23 can be changed not only to the upper surface of the electrode pair 28 but to a side surface or a lower surface.
-In each embodiment, the positive electrode current collection part 22 is not limited to one, For example, multiple may be sufficient and these may be electrically connected by one or a some lead | read | reed. The same can be said for the negative electrode current collector 23.

-In each embodiment, a positive electrode and a negative electrode are not limited to a sheet-like member, For example, you may use the plate-shaped member with predetermined amount thickness.
-In each embodiment, the raw material of the positive electrode sheet 13, the negative electrode sheet 11, and the separator sheet 29 can be changed suitably.

-In each embodiment, the structure of the positive electrode terminal 7, the negative electrode terminal 8, and the current collection parts 22 and 23 is not restricted to the example described in embodiment, It can change into another structure.
In each embodiment, the opening 4 a of the case body 4 is not limited to being formed on the upper surface of the case body 4, and can be changed to another location such as a side surface of the case body 4.

-In each embodiment, the electrode body 5 is not limited to a laminated structure, It is good also as a winding structure which winds a sheet-like electrode pair in many layers, and has a positive / negative electrode layer.
-In each embodiment, an electrical storage apparatus is not limited to a secondary battery, For example, it is good also as an electrical storage charged / discharged with an electric double layer capacitor.

-In each embodiment, the electrode in the electrode storage bag-shaped separator 10 is not limited to a positive electrode, It is good also as a negative electrode.
In each embodiment, various types of welding such as spot welding, butt welding, and projection welding can be used for lead welding (resistance welding). Further, the welding is not limited to resistance welding, and other methods can be adopted.

In each embodiment, the locking piece is not limited to the tongue piece 34 as described in the embodiment, and may be a protrusion that can be inserted into the cut.
-In each embodiment, a notch part is not limited to the hole-shaped slit part 36, The notch part which cut the sheet | seat edge may be sufficient.

-An electrode storage separator is not limited to bag shape, For example, it can change into other shapes, such as a cylinder shape.
The separator shape is not limited to a square shape, and can be appropriately changed to various shapes.

In each embodiment, the electrode body 5 (secondary battery 2) is not limited to being mounted on the vehicle 1, and can be mounted on other devices and apparatuses.
-This invention may combine the thought of each embodiment suitably.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle, 2 ... Secondary battery as an electrical storage apparatus, 5 ... Electrode body, 10 ... Electrode storage bag-shaped separator as an electrode storage separator, 11 ... Negative electrode sheet which comprises an electrode, 13 ... Electrode (positive electrode) Positive electrode sheet, 29 ... separator sheet, 31 ... first sheet surface, 32 ... second sheet surface, 34 (34a to 34d) ... tongue piece as a locking piece, 36 (36a to 36d) ... slit part as a notch part 37 ... Storage part as the inside of the bag, 42 ... Root part, 45 ... Omission part.

Claims (9)

In the electrode storage separator in which the electrode is sandwiched by the separator having the first sheet surface and the second sheet surface facing each other coated with ceramics,
A notch formed in the first sheet surface;
A locking piece formed on the second sheet surface and inserted into the cut portion, and the locking piece is arranged to protrude outward from an edge portion around the separator. An electrode storage separator. 2. The electrode storage separator according to claim 1, wherein a plurality of the locking pieces and the cut portions are formed and disposed on both sides in the surface direction of the electrode. The set of the locking pieces and the cut portions that are stacked as electrode bodies are alternately arranged in units of the stacked layers and are shifted in position in the stacked surface direction. 3. The electrode storage separator according to 1 or 2 . The first sheet surface is one surface formed by folding one separator sheet, and the second sheet surface is the other surface formed by folding the one separator sheet. The electrode storage separator according to any one of claims 1 to 3 , wherein the electrode storage separator is provided. The electrode storage separator according to any one of claims 1 to 3 , wherein the first sheet surface and the second sheet surface are stacked different sheet surfaces. The electrodes, the electrode housing separator according to any one of claims 1-5, characterized in that the positive electrode. An electrode body comprising the electrode storage separator according to any one of claims 1 to 6 . A power storage device comprising the electrode body according to claim 7 . A vehicle comprising the power storage device according to claim 8 .