JP2014003002A - Electrode storage separator, power storage device, and manufacturing method for electrode storage separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode storage separator in which a first separator and a second separator facing each other can be interconnected, even if the surface of the first separator facing the second separator is coated with ceramics, and to provide a power storage device, and a manufacturing method for an electrode storage separator.SOLUTION: In a second ceramics layer 312b and a third ceramics layer 321b, a welding portion W1 connecting a first resin layer 31a and a second resin layer 32a is provided at a part located in a bonding part 30b.

Description

  The present invention relates to an electrode storage separator in which an electrode is stored, a power storage device, and a method for manufacturing the electrode storage separator.

  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 this type of secondary battery, 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 assembly 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 are problems that the tact time of production is long and the 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

  By the way, in this type of separator, there is a need to use a separator whose surface is coated with a predetermined material (for example, ceramics) for the purpose of improving durability against heat shrinkage, for example. However, in the case of the bag-like separator described in the background art, when the surface-coated separator is bonded to the bag-like shape, the coating member affects the first separator and the second separator that face each other. There was a possibility that it could not be done.

  The object of the present invention is to connect the first separator and the second separator to each other even if the first separator and the second separator facing each other are coated with ceramics on the surface of the first separator facing the second separator. An electrode storage separator, a power storage device, and a method for manufacturing the electrode storage separator.

  In order to achieve the above object, the invention described in claim 1 includes a first separator and a second separator that have a resin layer and face each other, and the first separator faces the second separator. A ceramic layer coated with ceramics is formed on the surface to be processed, and further, a storage portion for storing electrodes, and the first separator and the second separator on the edge side of the first separator and the second separator with respect to the storage portion. An electrode housing separator having a bonding portion for bonding the separator, wherein the resin layer of the first separator and the resin layer of the second separator are disposed in a portion of the ceramic layer positioned at the bonding portion. The gist is that a connecting portion to be connected is provided.

  According to this invention, since the resin layers can be connected by the connecting portion, even if the ceramic layer is formed on the surface facing the second separator in the first separator with the aim of improving durability against heat shrinkage, The first separator and the second separator can be connected to each other.

The gist of the invention according to claim 2 is that, in the invention according to claim 1, the connecting portion penetrates the ceramic layer.
According to this invention, since the resin layers can be connected to each other by the connecting portion penetrating the ceramic layer, the connection between the first separator and the second separator can be strengthened.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the connecting portion is provided inside the edges of the first separator and the second separator in the joint portion. It is a summary.

  According to this invention, compared with the case where a connection part is formed in the edge of a 1st separator and a 2nd separator, the connection of a 1st separator and a 2nd separator can be strengthened.

The gist of the invention according to claim 4 is that, in the invention according to any one of claims 1 to 3, the ceramic layers are formed on both front and back surfaces of the resin layer.
According to this invention, compared with the case where the ceramic layer is formed only on one side of the resin layer, it is possible to improve the durability of thermal contraction in the first separator and the second separator.

  According to a fifth aspect of the present invention, in the invention according to the fourth aspect, in the resin layer, the surface of the first separator and the second separator on the opposite side to the surfaces facing each other, the connection. The gist is that the ceramic layer is formed in a portion overlapping the portion.

  According to this invention, in the resin layer, compared to the case where the ceramic layer is not formed on the surface of the first separator and the second separator opposite to the surfaces facing each other and overlapping the connecting portion. The durability against heat shrinkage in the resin layer can be improved.

  The invention according to a sixth aspect is the invention according to any one of the first to fifth aspects, wherein the connecting portion is provided at an edge of the first separator and the second separator at the joint portion. The gist is that it is provided.

  According to this invention, in the 1st separator and the 2nd separator, the size of the whole 1st separator and the 2nd separator can be made small by the part in which the site | part which exists outside a connection part does not exist.

  The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein a plurality of the connecting parts are provided at predetermined intervals in the joint part. The gist.

  According to this invention, a connection part is not formed in the whole periphery of a storage part. That is, since the ceramic layer can be left at the periphery of the storage portion, durability against heat shrinkage in the resin layer can be improved.

  The invention according to claim 8 is the invention according to any one of claims 1 to 7, wherein the first separator and the second separator face each other while continuing to the connecting portion. The gist of the invention is that each has a locking portion that locks to the outer surface on the opposite side.

  According to this invention, since the latching | locking part continuous with a connection part is latched by the outer surface on the opposite side to the surface where a 1st separator and a 2nd separator oppose, connection of a 1st separator and a 2nd separator Can be made stronger.

  The invention according to claim 9 is the invention according to any one of claims 1 to 8, wherein the connecting portion is formed by melting and solidifying a part of the resin layer. This is the gist.

  According to this invention, in order to connect the resin layers, the resin layers can be connected using the existing resin without using a resin different from the resin constituting the resin layer. Can be easily connected.

  The invention according to claim 10 is the invention according to any one of claims 1 to 9, wherein the electrode has a tab protruding from an edge of the electrode, and the tab is the first. It protrudes from the edge of a 1st separator and a 2nd separator through between the opposing surfaces of a separator and the said 2nd separator, The protrusion of the said tab among the junction parts of the said 1st separator and the said 2nd separator The sum of the areas of the connecting parts is the same in the joined part on the edge side and the joined part on the edge side opposite to the projected edge of the tab across the storage part. .

  According to the present invention, for example, in the case where the connecting portion is formed by pressing the resin layer in a melted state, the protruding edge portion of the tab is joined to the opposite edge side of the storage portion. Thus, it is possible to prevent the same load from being applied and the load from being concentrated on one joint. For this reason, in the electrode storage separator, it is possible to prevent a joint failure at the connecting portion between the joint portion on the edge side where the tab protrudes and the joint portion on the opposite edge side sandwiching the storage portion. It is possible to prevent wrinkles from occurring.

  According to an eleventh aspect of the present invention, in the power storage device, the first electrode is accommodated inside the electrode accommodating separator according to any one of the first to tenth aspects, the electrode accommodating separator, and the first The gist of the present invention is to provide an electrode assembly in which a second electrode having a polarity different from that of one electrode is formed in layers.

According to this invention, the number of stacking steps of the first electrode, the second electrode, and the separator can be reduced, and the productivity of the power storage device can be improved.
The invention according to claim 12 is the invention according to claim 11, wherein the power storage device is a secondary battery. According to the present invention, an effect similar to that of the eleventh aspect can be obtained.

  The invention described in claim 13 includes a first separator and a second separator that have a resin layer and face each other, and the first separator is coated with ceramics on a surface facing the second separator. A ceramic layer is formed, and further, a storage part that stores the electrode, and a joint part that joins the first separator and the second separator closer to the edge side of the first separator and the second separator than the storage part In the method for manufacturing an electrode storage separator, the pressing member is pressed in a state of being heated, and a part of the resin layer is melted by heat from the pressing member, and is melted. The gist is to penetrate a part of the resin layer through the ceramic layer and solidify a part of the molten resin layer. According to the present invention, an effect similar to that of the first aspect can be obtained.

  The invention according to a fourteenth aspect is the invention according to the thirteenth aspect, wherein a pressing portion that presses the joint portion protrudes from one end surface of the pressing member, and the pressing portion is connected to the joint portion. The gist is to have a pressing surface at the tip and a chamfered portion at the periphery of the pressing surface.

  According to this invention, when the joining portion is pressed by the pressing portion, the chamfered portion prevents the peripheral edge of the pressing surface from hitting the joining portion. For this reason, in a junction part, it is prevented that an excessive pressure is applied to the periphery of the site | part pressed by the press surface.

  According to a fifteenth aspect of the invention, in the invention of the thirteenth or fourteenth aspect, the electrode has a tab protruding from an end edge of the electrode, and the tab includes the first separator and the second separator. It protrudes from the edge of a 1st separator and a 2nd separator through between the surfaces which a separator opposes, The joining of the edge side where the said tab protruded among the junction parts of the said 1st separator and the said 2nd separator The sum of the areas pressed by the pressing member is the same between the portion and the joint portion on the side opposite to the protruding edge of the tab across the storage portion.

  According to the present invention, when the joint portion is pressed by the pressing member, the same load is applied to the joint portion on the edge side where the tab protrudes and the joint portion on the opposite edge side across the storage portion, and one joint portion is applied. It is possible to prevent the load from being concentrated and applied. Therefore, the sum of the areas of the connecting portions formed by pressing of the pressing portion is the same between the joining portion on the edge side where the tab protrudes and the joining portion on the opposite edge side across the storage portion. As a result, in the obtained electrode storage separator, it is possible to prevent poor bonding at the connecting portion between the joint portion on the edge side where the tab protrudes and the joint portion on the opposite edge side across the storage portion, It is possible to prevent wrinkles from occurring at the joint.

  According to this invention, in the first separator and the second separator facing each other, even if the surface of the first separator facing the second separator is coated with ceramics, the first separator and the second separator are connected to each other. be able to.

The disassembled perspective view of the secondary battery in 1st Embodiment. The disassembled perspective view which shows the structure of an electrode assembly. The top view of an electrode storage separator. Sectional drawing which expands and shows a welding part. (A) is sectional drawing which shows the state before pressing a press member against a 1st separator, (b) is sectional drawing which shows the state which pressed the press member against the 1st separator, (c) is a 1st resin layer and 2nd Sectional drawing which shows the state connected with the resin layer by the welding part. The perspective view which shows the state which arranged the positive electrode sheet | seat in the 1st separator and 2nd separator in 2nd Embodiment, and has arrange | positioned. The top view which shows the state which connected the edge of the upper end side of a 1st separator and a 2nd separator, and the edge of a lower end side mutually. The top view which shows the state which cut | disconnects between a 1st separator and a 2nd separator between adjacent positive electrode sheets. (A) is sectional drawing which shows the state before cut | disconnecting a 1st separator and a 2nd separator with a cutting member, (b) is sectional drawing which shows the state which has cut | disconnected the 1st separator and the 2nd separator with a cutting member, (C) is sectional drawing which shows the state which the 1st resin layer and the 2nd resin layer were connected by the welding part. (A) is sectional drawing which shows the state which made the needle-shaped member penetrate the 1st separator and 2nd separator in 3rd Embodiment, (b) shows the state by which the 1st separator and the 2nd separator were connected. Sectional drawing. (A) is sectional drawing which shows the state before piercing the needle part in 4th Embodiment in a 1st separator and a 2nd separator, (b) shows the state which pierced the needle part in the 1st separator and the 2nd separator. Sectional drawing, (c) is sectional drawing which shows the state which the 1st resin layer and the 2nd resin layer were connected by the welding part. The perspective view which shows the manufacture example of the electrode storage separator in another embodiment. (A) is sectional drawing which shows the state before pressing a 1st separator with the pressing member in another embodiment, (b) is sectional drawing which shows the state which pressed the 1st separator with the pressing member in another embodiment. The top view of the electrode storage separator in another embodiment. The top view of the electrode storage separator in another embodiment. The top view of the electrode storage separator in another embodiment.

(First embodiment)
Hereinafter, a first embodiment in which the present invention is embodied in a secondary battery mounted on a vehicle (for example, an industrial vehicle or a passenger vehicle) will be described with reference to FIGS. The secondary battery is used to drive a travel motor.

  As shown in FIG. 1, the secondary battery 10 includes an electrode assembly 11 and an aluminum case 20 that houses the electrode assembly 11. The case 20 includes a case main body 21 having a bottomed rectangular box shape in which an opening 21 a into which the electrode assembly 11 can be inserted is formed, and a rectangular plate-shaped lid 22 that closes the opening 21 a of the case main body 21. Has been. An electrolyte is injected into the case 20. A positive electrode terminal 23a and a negative electrode terminal 23b project outward from the terminal wall 23, which is one of the four side walls provided upright from the periphery of the lid 22.

  As shown in FIG. 2, the electrode assembly 11 has a bag shape and an electrode storage separator 30 that stores therein a positive electrode sheet 12 that is a first electrode, and a second electrode having a polarity different from that of the positive electrode sheet 12. A plurality of negative electrode sheets 13 that are electrodes are laminated in a certain direction (stacking direction), and are configured in layers. That is, the electrode assembly 11 of the present embodiment is formed by stacking the electrode storage separator 30 storing the positive electrode sheet 12 and the negative electrode sheet 13 in a certain direction along the thickness direction (stacking direction) of the electrode assembly 11. This is a stacked electrode assembly.

  The positive electrode sheet 12 includes a positive electrode metal foil 121 having a quadrangular sheet shape, and a positive electrode active material layer 12 a formed by applying an active material to both front and back surfaces of the positive electrode metal foil 121. Further, the positive electrode uncoated portion 12b is configured by a portion of the positive electrode metal foil 121 where the active material is not applied. A positive electrode tab 12c protrudes from an edge 121b of the positive electrode uncoated portion 12b. The negative electrode sheet 13 includes a negative electrode metal foil 131 having a rectangular sheet shape, and a negative electrode active material layer 13 a in which an active material is applied to both front and back surfaces of the negative electrode metal foil 131. Moreover, the negative electrode uncoated part 13b is comprised by the site | part in which the active material in the metal foil 131 for negative electrodes is not apply | coated. A negative electrode tab 13c protrudes from an edge 131b of the negative electrode uncoated portion 13b. Each positive electrode sheet 12 is laminated in a certain direction so that each positive electrode tab 12c overlaps, and each negative electrode sheet 13 is laminated in a certain direction so that each negative electrode tab 13c overlaps. The positive electrode metal foil 121 is an aluminum foil, and the negative electrode metal foil 131 is a copper foil. Moreover, the positive electrode sheet 12 is formed in a size smaller than the negative electrode sheet 13, and the sizes of the positive electrode sheet 12 and the negative electrode sheet 13 are set so that the positive electrode active material layer 12a is covered with the negative electrode active material layer 13a.

  As shown in FIG. 1, the electrode assembly 11 has a positive electrode tab group 12d formed by collecting the positive electrode tabs 12c. A positive electrode conductive member 19a having a rectangular plate shape is joined (connected) to the positive electrode tab group 12d by ultrasonic welding. The electrode assembly 11 has a negative electrode tab group 13d formed by collecting the negative electrode tabs 13c. A negative electrode conductive member 19b having a rectangular plate shape is joined (connected) to the negative electrode tab group 13d by ultrasonic welding. The positive electrode tab group 12 d and the negative electrode tab group 13 d extend in the same direction (one direction) from one side of the electrode assembly 11.

  The positive electrode conductive member 19a is connected to an end portion of the positive electrode terminal 23a protruding into the case main body 21, and the negative electrode conductive member 19b is connected to an end portion of the negative electrode terminal 23b protruding into the case main body 21. Thus, the positive electrode tab group 12d and the positive electrode terminal 23a are electrically connected via the positive electrode conductive member 19a, and the negative electrode tab group 13d and the negative electrode terminal 23b are electrically connected via the negative electrode conductive member 19b. The Further, in a state where the electrode assembly 11 is accommodated in the case main body 21, the lid 22 and the case main body 21 are joined by laser welding, and the opening 21 a of the case main body 21 is closed by the lid 22 and sealed. Thus, the secondary battery 10 is configured. Insulation is ensured between the electrode assembly 11 and the inner surface of the case 20 by an insulating sheet (not shown).

Next, the electrode storage separator 30 will be described.
As shown in FIG. 2, the electrode storage separator 30 includes a rectangular sheet-shaped first separator 31 and a rectangular sheet-shaped second separator 32 that face each other. The first separator 31 includes a first resin layer 31a as a resin layer, a first ceramic layer 311b as a ceramic layer in which the surface of the first resin layer 31a is coated with ceramics, and a back surface of the first resin layer 31a. And a second ceramic layer 312b as a ceramic layer coated with ceramics. The first resin layer 31a is made of, for example, polyethylene (PE). The first ceramic layer 311b and the second ceramic layer 312b are porous layers including, for example, ceramic particles (ceramic powder) made of aluminum oxide (Al ₂ O ₃ ) and a binder.

  The second separator 32 includes a second resin layer 32a as a resin layer, a third ceramic layer 321b as a ceramic layer in which the surface of the second resin layer 32a is coated with ceramics, and a back surface of the second resin layer 32a. And a fourth ceramic layer 322b as a ceramic layer coated with ceramics. The second resin layer 32a is made of, for example, polyethylene (PE). The third ceramic layer 321b and the fourth ceramic layer 322b are porous layers containing, for example, ceramic particles (ceramic powder) made of aluminum oxide (Al2O3) and a binder. The positive electrode sheet 12 is interposed between the first separator 31 and the second separator 32.

  As shown in FIG. 3, in the first separator 31 and the second separator 32, the outer edge portion excluding the portion facing the positive electrode tab 12 c becomes a joint portion 30 b that joins the first separator 31 and the second separator 32. ing. A plurality of welded portions W1 are provided at a predetermined interval in the joint portion 30b. The joining portion 30b is the entire region where the welded portion W1 is provided around the positive electrode sheet 12, and includes all the welded portions W1. Each welding part W1 is arrange | positioned along with linear form so that each of the four sides (four sides of the 1st separator 31 and the 2nd separator 32) of the positive electrode sheet 12 may be followed.

  As shown in FIG. 4, the welded portion W1 is a communication formed so as to penetrate the second ceramic layer 312b and the third ceramic layer 321b that form surfaces facing each other in the first separator 31 and the second separator 32. It is provided in the part R1. And the welding part W1 penetrates the 2nd ceramic layer 312b and the 3rd ceramic layer 321b, and the 1st resin layer 31a and the 2nd resin layer 32a are connected by this welding part W1. The welded portion W1 forms a bag-shaped electrode storage separator 30 formed by overlapping the first separator 31 and the second separator 32 so as to face each other, and the positive electrode sheet 12 is stored inside the electrode storage separator 30. A storage portion 30a is formed. The joining portion 30b is formed closer to the end edge 31e of the first separator 31 and the end edge 32e of the second separator 32 than the storage portion 30a. The first ceramic layer 311b is located on the outermost layer on the first separator 31 side, and the fourth ceramic layer 322b is located on the outermost layer on the second separator 32 side.

  The welded portion W1 is formed on the inner side (the storage portion 30a side) of the end edge 31e of the first separator 31 and the end edge 32e of the second separator 32 in the joint portion 30b. A portion of the first ceramic layer 311b that overlaps with the welded portion W1 is crushed toward the first resin layer 31a. That is, the surface of the first resin layer 31a on the first ceramic layer 311b side and the portion overlapping the welded portion W1 is coated with ceramics.

Next, the operation of this embodiment will be described.
The electrode assembly 11 of the present embodiment is assembled by alternately stacking the electrode storage separators 30 and the negative electrode sheets 13 in a state where the positive electrode sheets 12 are stored in advance in the electrode storage separators 30. Therefore, compared with the case of assembling the electrode assembly by sequentially stacking the positive electrode sheet, the negative electrode sheet, and the separator, the number of sheets laminated when assembling the electrode assembly 11 is reduced, and the tact time of productivity is shortened. The productivity of the electrode assembly 11 and thus the productivity of the secondary battery 10 are improved.

  Further, the first separator 31 and the second separator 32 constituting the electrode housing separator 30 have the first ceramic layer 311b and the second ceramic layer 312b on both the front and back surfaces of the first resin layer 31a, and the second resin layer 32a. A third ceramic layer 321b and a fourth ceramic layer 322b are provided on both the front and back surfaces. Therefore, the durability against heat shrinkage of the first resin layer 31a is improved by the first ceramic layer 311b and the second ceramic layer 312b, and the durability against heat shrinkage of the second resin layer 32a is enhanced by the third ceramic layer 321b and The fourth ceramic layer 322b is improved. Therefore, the positive electrode sheet 12 and the negative electrode sheet 13 constituting the electrode assembly 11 are suppressed from being short-circuited at a high temperature, and the occurrence of problems in the secondary battery 10 is suppressed. As a result, the occurrence of problems in the running performance of the vehicle using the secondary battery 10 is suppressed.

Next, a method for manufacturing the electrode storage separator 30 will be described.
As shown in FIG. 5A, when manufacturing the electrode housing separator 30, a metal pressing member 40 is used. A plurality of pressing portions 41 protrude from the one end surface 40 a of the pressing member 40. The tip of each pressing portion 41 is formed in a flat surface shape.

  And while sandwiching the positive electrode sheet 12 between the first separator 31 and the second separator 32, the pressing member 40 is heated to a temperature higher than the melting points of the first resin layer 31a and the second resin layer 32a, Each pressing portion 41 of the pressing member 40 is pressed against the joint portion 30b from the first separator 31 side. Then, as shown in FIG. 5B, in the first separator 31, the first ceramic layer 311b is crushed by each pressing portion 41, and is crushed as shown in an enlarged manner in FIG. 5B. The heat from the pressing member 40 is transmitted to the portion of the first resin layer 31a that overlaps the first ceramic layer 311b.

  The heat from the pressing member 40 melts the resin that forms the portions of the first resin layer 31a and the second resin layer 32a that overlap the crushed first ceramic layer 311b. Then, the molten resin melted in the first resin layer 31a is pushed out so as to ooze out toward the second ceramic layer 312b and the third ceramic layer 321b by the load from each pressing portion 41. Then, the ceramic particles forming a portion overlapping the crushed first ceramic layer 311b in the second ceramic layer 312b and the third ceramic layer 321b are melted by being pushed out toward the second ceramic layer 312b and the third ceramic layer 321b. Mix with resin.

  As a result, as shown in FIG. 5C, the molten resin and the ceramic particles are mixed in the portion of the second ceramic layer 312b and the third ceramic layer 321b that overlaps the crushed first ceramic layer 311b. As the mixed resin flows, a communication portion R1 that connects the first resin layer 31a and the second resin layer 32a is formed. That is, the load from each pressing portion 41 of the pressing member 40 pressed against the joint portion 30b is mixed with the portion of the second ceramic layer 312b and the third ceramic layer 321b that overlaps the crushed first ceramic layer 311b. The load is such that the density of the ceramic particles can be reduced so that the resin can easily flow.

  Then, the mixed resin flows into the communication portion R1, and the first resin layer 31a and the second resin layer 32a are connected by the mixed resin. And the welding part W1 which joins the 1st separator 31 and the 2nd separator 32 mutually is formed by solidifying these molten mixed resin. That is, the welded part W1 is formed by melting and solidifying a part of the first resin layer 31a. Therefore, the welding part W1 is corresponded to the connection part which connects the 1st resin layer 31a and the 2nd resin layer 32a. The first separator 31 and the second separator 32 are joined to each other by the welded portion W1, so that the first separator 31 and the second separator 32 overlap each other so as to face each other. Is formed.

In the above embodiment, the following effects can be obtained.
(1) The first ceramic layer 311b and the second ceramic layer 312b are formed on both front and back surfaces of the first resin layer 31a with the aim of improving durability against heat shrinkage, and the third ceramic layer is formed on both front and back surfaces of the second resin layer 32a. The electrode storage separator 30 was constituted by the first separator 31 and the second separator 32 on which the 321b and the fourth ceramic layer 322b were formed. In the present embodiment, in the second ceramic layer 312b and the third ceramic layer 321b, a welded portion W1 that connects the first resin layer 31a and the second resin layer 32a is provided in the joint portion 30b. Therefore, in the first separator 31 and the second separator 32, the first separator 31 and the second separator 32 are connected to each other even if the second ceramic layer 312b and the third ceramic layer 321b are arranged to face each other. be able to.

  (2) Since the welded portion W1 penetrates the second ceramic layer 312b and the third ceramic layer 321b, the connection between the first separator 31 and the second separator 32 can be strengthened.

  (3) The welded portion W <b> 1 is formed inside the end edge 31 e of the first separator 31 and the end edge 32 e of the second separator 32. Therefore, compared with the case where the welding part W1 is formed in the edge 31e of the 1st separator 31, and the edge 32e of the 2nd separator 32, the connection of the 1st separator 31 and the 2nd separator 32 is solid. It can be.

  (4) In the first separator 31 and the second separator 32, the first ceramic layer 311b and the second ceramic layer 312b are formed on both front and back surfaces of the first resin layer 31a, and the third ceramic is formed on both front and back surfaces of the second resin layer 32a. A layer 321b and a fourth ceramic layer 322b were formed. Therefore, the first separator 31 (the first resin layer 31a) is compared with the case where the ceramic is coated only on one side of the first resin layer 31a or the ceramic is coated only on one side of the second resin layer 32a. Or durability of the heat shrink in the 2nd separator 32 (2nd resin layer 32a) can be improved.

  (5) In the first resin layer 31a, ceramics are coated on a portion of the first separator 31 and the second separator 32 that is opposite to the surfaces facing each other and overlaps the welded portion W1. Therefore, in the 1st resin layer 31a, it is a surface on the opposite side to the mutually opposing surface side in the 1st separator 31 and the 2nd separator 32, Comprising: Compared with the case where the part which overlaps with the welding part W1 is not coated with ceramics Thus, durability against heat shrinkage in the first resin layer 31a can be improved.

  (6) The joint portion 30b includes a plurality of welded portions W1 formed at a predetermined interval. Accordingly, since the second ceramic layer 312b and the third ceramic layer 321b can be left at the periphery of the storage portion 30a, durability against thermal contraction in the first resin layer 31a and the second resin layer 32a can be improved. .

  (7) The joint portion 30b includes a plurality of welded portions W1 formed at a predetermined interval. Therefore, when the first resin layer 31a and the second resin layer 32a are melted and joined, the entire periphery of the storage portion 30a is not melted, so the welded portion W1 is connected to the edge 31e of the first separator 31 and the second edge. The separator 32 can be more easily formed on the inner side than the end edge 32e.

  (8) The welded portion W1 is formed by melting and solidifying a part of the first resin layer 31a. Therefore, in order to connect the first resin layer 31a and the second resin layer 32a, the first resin layer 31a can be formed using an existing resin without using a resin different from the resin constituting the first resin layer 31a. Since the 2nd resin layer 32a can be connected, the 1st resin layer 31a and the 2nd resin layer 32a can be connected easily.

  (9) According to the present embodiment, the electrode assembly 11 can be assembled by alternately stacking the electrode storage separators 30 and the negative electrode sheets 13 in a state where the positive electrode sheets 12 are stored in the electrode storage separator 30 in advance. it can. Therefore, compared with the case of assembling the electrode assembly by sequentially stacking the positive electrode sheet, the negative electrode sheet, and the separator, the number of sheets laminated when assembling the electrode assembly 11 is reduced, and the tact time of productivity is shortened. The productivity of the electrode assembly 11 and thus the productivity of the secondary battery 10 can be improved.

  (10) In the present embodiment, the first separator 31 and the second separator 32 constituting the electrode housing separator 30 have the first ceramic layer 311b and the second ceramic layer 312b on both the front and back surfaces of the first resin layer 31a. A third ceramic layer 321b and a fourth ceramic layer 322b are provided on both front and back surfaces of the second resin layer 32a. Therefore, the durability against heat shrinkage of the first resin layer 31a can be improved by the first ceramic layer 311b and the second ceramic layer 312b, and the durability against heat shrinkage of the second resin layer 32a can be improved. And it can be improved by the fourth ceramic layer 322b. Therefore, the positive electrode sheet 12 and the negative electrode sheet 13 constituting the electrode assembly 11 are suppressed from being short-circuited at a high temperature, and the occurrence of problems in the secondary battery 10 can be suppressed. As a result, it is possible to suppress the occurrence of problems in the running performance of the vehicle using the secondary battery 10.

(Second Embodiment)
A second embodiment embodying the present invention will be described below with reference to FIGS. In addition,
In the embodiments described below, the same components as those in the first embodiment described above are denoted by the same reference numerals, and redundant description thereof is omitted or simplified. In the second embodiment, a description will be given focusing on a method for manufacturing the electrode storage separator 30A.

  As shown in FIG. 6, first, a long strip-shaped first separator 31 and second separator 32 are prepared. A plurality of positive electrode sheets 12 are arranged side by side between the first separator 31 and the second separator 32, and the positive electrode sheets 12 are sandwiched between the first separator 31 and the second separator 32.

  Subsequently, as shown in FIG. 7, the upper edge side (side from which the positive electrode tab 12 c protrudes) and the lower end side (side from which the positive electrode tab 12 c protrude) of the superimposed first separator 31 and second separator 32. Are joined to each other in the same manner as in the first embodiment.

  Subsequently, as shown in FIG. 8, the first separator 31 and the second separator 32 are cut between the adjacent positive electrode sheets 12. This cutting is performed by a metal cutting member 50 as shown in FIG. The cutting member 50 is heated to a temperature higher than the melting points of the first resin layer 31a and the second resin layer 32a when the first separator 31 and the second separator 32 are cut. Then, as shown in FIG. 9B, the first separator 31 and the second separator 32 are cut between the adjacent positive electrode sheets 12 by the heated cutting member 50. Then, the first resin layer 31a and the second resin layer 32a are cut edges of the second ceramic layer 312b and the third ceramic layer 321b, the edge R2 of the second ceramic layer 312b and the edge R3 of the third ceramic layer 321b. Communicate via

  At this time, heat from the cutting member 50 is transmitted to portions of the first resin layer 31a and the second resin layer 32a that are in contact with the cutting member 50. Then, due to the heat from the cutting member 50, the portions of the first resin layer 31a and the second resin layer 32a that are in contact with the cutting member 50 are melted. Then, the molten resin melted in the first resin layer 31 a and the second resin layer 32 a is the edge of the first separator 31 and the edge of the second separator 32 that are cut edges of the first separator 31 and the second separator 32. It flows out from 32e. Further, the molten resin that has flowed out is connected to each other via the edge R2 of the second ceramic layer 312b or the edge R3 of the third ceramic layer 321b. As the molten resin solidifies, a welded portion W2 is formed between the first resin layer 31a and the second resin layer 32a as a connecting portion that connects the first resin layer 31a and the second resin layer 32a. Is done. That is, the welded portion W2 is formed by melting and solidifying a part of the first resin layer 31a and the second resin layer 32a, and the edge 31e of the first separator 31 and the edge of the second separator 32. It is formed so as to be continuous along 32e. In this way, the first separator 31 and the second separator 32 are joined to each other by the welded portion W2, and the first separator 31 and the second separator 32 are overlapped so as to face each other. A plurality of 30A are formed.

Therefore, according to the second embodiment, the following effects can be obtained in addition to the effects (1), (4), and (8) to (10) of the first embodiment. .
(11) The welded portion W <b> 2 is formed on the edge 31 e of the first separator 31 and the edge 32 e of the second separator 32, which are cutting edges of the first separator 31 and the second separator 32. Therefore, in the 1st separator 31 and the 2nd separator 32, the size of the 1st separator 31 and the 2nd separator 32 whole can be made small by the part which does not exist outside the welding part W2.

  (12) In the second embodiment, since the welded portion W2 can be visually recognized from the outside of the electrode storage separator 30A, the connection state between the first resin layer 31a and the second resin layer 32a can be easily confirmed. it can.

(Third embodiment)
Hereinafter, a third embodiment of the present invention will be described with reference to FIG. In the embodiment described below, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the redundant description thereof is omitted or simplified. In the third embodiment, a description will be given focusing on a method for manufacturing the electrode storage separator 30B.

  As shown in FIG. 10A, first, a plurality of needle-like members 60 made of, for example, polypropylene (PP) are penetrated at predetermined intervals with respect to the joint portions 30b in the first separator 31 and the second separator 32. Let Specifically, each needle-like member 60 is connected to the first separator 31 and the first so that one end of each needle-like member 60 protrudes from the fourth ceramic layer 322b and the other end protrudes from the first ceramic layer 311b. The two separators 32 are penetrated with respect to the joint part 30b. By penetration of the needle-like member 60 into the first separator 31 and the second separator 32, the first ceramic layer 31a and the second resin layer 32a are formed on the second ceramic layer 312b and the third ceramic layer 321b at the joint 30b. Through holes R4 and R5 are formed.

  Subsequently, the joint portion 30b in the first separator 31 and the second separator 32 is heated to a temperature having a higher melting point than the first resin layer 31a, the second resin layer 32a, and the needle-like member 60. Then, as shown in FIG. 10B, one end of each needle-like member 60 melts and flows on the outer surface of the first ceramic layer 311b, and the other end of each needle-like member 60 melts to cause the fourth ceramics. Flows on the outer surface of layer 322b. Furthermore, the body 63 connecting the one end and the other end of the needle-like member 60, and the first resin layer 31a and the second resin layer 32a around the body 63 are also melted.

  Then, the melted needle-like member 60, the first resin layer 31a, and the second resin layer 32a are solidified. As a result, a first locking portion 61 as a locking portion locked to the outer surface of the first ceramic layer 311b is formed by one end of the needle-like member 60 solidified on the outer surface of the first ceramic layer 311b. Further, the second locking portion 62 as a locking portion locked to the outer surface of the fourth ceramic layer 322b is formed by the other end of the needle-like member 60 solidified on the outer surface of the fourth ceramic layer 322b. Furthermore, the trunk | drum 63 and the 1st resin layer 31a and the 2nd resin layer 32a around the trunk | drum 63 are joined. That is, the first resin layer 31 a and the second resin layer 32 a are connected via the trunk portion 63. Therefore, in the third embodiment, the body 63 is provided in the through holes R4 and R5 and corresponds to a connecting portion that penetrates the second ceramic layer 312b and the third ceramic layer 321b. Thereby, the 1st separator 31 and the 2nd separator 32 are joined mutually, and the bag-shaped electrode storage separator 30B which overlaps so that the 1st separator 31 and the 2nd separator 32 may mutually oppose is formed.

  Further, the first separator 31 and the second separator are locked by the locking of the first ceramic layer 311b to the outer surface of the first locking portion 61 and the locking of the fourth ceramic layer 322b of the second locking portion 62 to the outer surface. 32 is sandwiched between the first locking portion 61 and the second locking portion 62. For this reason, the connection between the first separator 31 and the second separator 32 is stronger.

  Therefore, according to the second embodiment, in addition to the effects (1) to (4), (6), (7), (9), and (10) of the first embodiment, The effect shown in can be obtained.

  (13) The first locking portion 61 is locked to the outer surface of the first ceramic layer 311b, and the second locking portion 62 is locked to the outer surface of the fourth ceramic layer 322b. Therefore, since the 1st separator 31 and the 2nd separator 32 can be inserted | pinched by the 1st latching | locking part 61 and the 2nd latching | locking part 62, the connection of the 1st separator 31 and the 2nd separator 32 is stronger. It can be.

  (14) The needle-like member 60 was formed of polypropylene (PP). Therefore, since the needle-like member 60 has a higher melting point than the first resin layer 31a and the second resin layer 32a formed of polyethylene (PE), the first resin layer 31a and the second resin layer 32a It is possible to easily suppress the thermal contraction of the joint portion.

(Fourth embodiment)
Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG. In the embodiment described below, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the redundant description thereof is omitted or simplified. In the fourth embodiment, a method for manufacturing the electrode storage separator 30C will be mainly described.

  As shown in FIG. 11A, when manufacturing the electrode housing separator 30C, a metallic needle-like member 70 is used. A plurality of needle portions 71 protrude from the one end surface 70 a of the needle-like member 70.

  And as shown in FIG.11 (b), while sandwiching the positive electrode sheet 12 between the 1st separator 31 and the 2nd separator 32, it is the melting | fusing point of the needle-like member 70 of the 1st resin layer 31a and the 2nd resin layer 32a. Each needle part 71 of the acicular member 70 is pierced from the 1st separator 31 side with respect to the junction part 30b in the state heated to higher temperature. Specifically, until the tip of each needle portion 71 passes through the first ceramic layer 311b, the first resin layer 31a, the second ceramic layer 312b, and the third ceramic layer 321b and reaches the second resin layer 32a. Each needle portion 71 is pierced. Then, through holes R6 and R7 that connect the first resin layer 31a and the second resin layer 32a are formed in the second ceramic layer 312b and the third ceramic layer 321b. Moreover, the site | parts around each needle part 71 in the 1st resin layer 31a and the 2nd resin layer 32a fuse | melt with the heat | fever of the needle-like member 70. FIG.

  Then, as shown in FIG.11 (c), each needle part 71 is pulled out. Then, the molten resin melted in the first resin layer 31a flows into the second resin layer 32a side through the through holes R6 and R7. And the welding part W3 which joins the 1st separator 31 and the 2nd separator 32 mutually is formed because molten resin solidifies. That is, the weld part W3 is formed by melting and solidifying a part of the first resin layer 31a. Therefore, the welded portion W3 corresponds to a connecting portion that connects the first resin layer 31a and the second resin layer 32a and penetrates the second ceramic layer 312b and the third ceramic layer 321b. Then, the first separator 31 and the second separator 32 are joined to each other by the welded portion W3, so that the first separator 31 and the second separator 32 are joined to each other, and the first separator 31 and the second separator 32 are joined together. A bag-shaped electrode housing separator 30C is formed so as to overlap each other so as to face each other.

Therefore, according to the second embodiment, the same effects as the effects (1) to (4) and (6) to (10) of the first embodiment can be obtained.
In addition, you may change the said embodiment as follows.

  As shown in FIG. 12, after preparing a large separator 81 and arranging the positive electrode sheet 12 on this, the separator 81 is folded back at the center so that the separator 81 wraps from the front and back of the positive electrode sheet 12. May be. In this case, the electrode storage separator 30D can be manufactured in a simple form in which one separator 81 is bent.

  As shown to Fig.13 (a), the some press part 41 protruded and formed from the one end surface 40a of the press member 40 equips the front-end | tip with the flat surface-shaped press surface 41a. The planar shape of the pressing surface 41a is a quadrangular shape that is similar to the planar shape of the welded portion W1 to be manufactured. In addition, at the tip of each pressing portion 41, the peripheral edge of the pressing surface 41 a is a chamfered portion 41 b that is continuous with the pressing surface 41 a and curves in an arc shape toward the proximal end of the pressing portion 41.

  When comprised in this way, in the state which heated the press member 40 to the temperature higher than melting | fusing point of the 1st resin layer 31a and the 2nd resin layer 32a, the press surface 41a of each press part 41 is made with respect to the junction part 30b. And press from the first separator 31 side. Then, as shown in FIG. 13B, in the first separator 31, the first ceramic layer 311 b is pressed by the pressing portions 41 and the first resin layer 31 a is crushed. At this time, each chamfer 41b prevents the peripheral edge of each pressing surface 41a from hitting the first ceramic layer 311b.

  Therefore, in the 1st separator 31, it can prevent that an excessive load concentrates on the periphery of the site | part pressed by the press surface 41a, and can prevent that the 1st ceramic layer 311b cuts.

  As shown in FIG. 14, among the joint portions 30b of the electrode storage separator 30, the joint portion on the edge side where the positive electrode tab 12c protrudes is defined as a tab side joint portion 30d. On the other hand, among the joint portions 30b of the electrode storage separator 30, a joint portion on the edge side opposite to the protruding edge side of the positive electrode tab 12c with the housing portion 30a interposed therebetween is defined as a bottom side joint portion 30e.

  And the number of the welding parts W1 which the tab side junction part 30d contains, and the number of the welding parts W1 which the bottom side junction part 30e contain are made the same, and the total of the area of the welding part W1 is set by the tab side junction part 30d and the bottom side junction part 30e. It may be the same. In the tab side joint portion 30d, two welded portions W1 are juxtaposed along the protruding direction from the positive electrode uncoated portion 12b of the positive electrode tab 12c on both sides of the positive electrode tab 12c.

  When comprised in this way, when the junction part 30b is pressed by the press member 40, the same load can be applied from the press member 40 by the tab side junction part 30d and the bottom side junction part 30e. For this reason, it is possible to prevent the load from being concentrated on one of the tab side joint 30d and the bottom side joint 30e. Therefore, the sum of the areas of the welded portions W1 formed by the pressing of the pressing portion 41 is the same between the tab-side bonding portion 30d and the bottom-side bonding portion 30e. As a result, in the electrode storage separator 30 obtained, the tab-side joint 30d and the bottom-side joint 30e can prevent bonding failure at the welded portion W1, and the tab-side joint 30d and the bottom-side joint. It is possible to prevent wrinkles from occurring in the portion 30e.

Note that the arrangement and shape of the welded portion W1 may be changed as appropriate.
As shown in FIG. 15, the welded portions W1 at both corners of the tab side joined portion 30d and the bottom side joined portion 30e are formed in a Y shape in plan view, and between the Y shaped welded portions W1 at both corners. A plurality of quadrangular welded portions W1 similar to those in the embodiment may be provided side by side, and the total area of the welded portions W1 may be the same at the tab-side joint portion 30d and the bottom-side joint portion 30e. The Y-shaped welded portions W1 at both corners may be T-shaped in plan view.

  In addition, as shown in FIG. 16, the welded portions W1 at both corners of the tab-side joined portion 30d and the bottom-side joined portion 30e are formed in a straight line shape in plan view, and between the straight welded portions W1 at both corner portions. The elongated and linear welded portion W1 may be provided, and the total area of the welded portions W1 may be the same in the tab side joined portion 30d and the bottom side joined portion 30e.

(Circle) in 1st Embodiment, the welding part W1 should just be formed in at least one part of the junction part 30b. In addition, for example, a plurality of welded portions W1 may be formed in the bonding portion 30b so as to be arranged in a lattice pattern.

(Circle) in 1st Embodiment, the welding part W1 may be formed so that it may continue along the periphery of the accommodating part 30a.
In the first embodiment, the ceramic does not have to be coated on the surface of the first resin layer 31a on the first ceramic layer 311b side that overlaps the welded portion W1.

  In the first embodiment, the ceramic particles that form a portion overlapping the crushed first ceramic layer 311b in the second ceramic layer 312b and the third ceramic layer 321b are the second ceramic layer 312b and the third ceramic layer 321b. It does not have to be mixed with the molten resin extruded to the side. For example, due to the load from each pressing portion 41, the molten resin flows through the gaps between the ceramic particles that form portions that overlap the crushed first ceramic layer 311 b in the second ceramic layer 312 b and the third ceramic layer 321 b. The first resin layer 31a and the second resin layer 32a may be connected by a molten resin. In this case, the molten resin is formed between the ceramic particles forming the portion overlapping the crushed first ceramic layer 311b in the second ceramic layer 312b and the third ceramic layer 321b due to the load from each pressing portion 41. It spreads to create a gap that can flow into.

In the first embodiment, welds may be further formed on the edge 31 e of the first separator 31 and the edge 32 e of the second separator 32.
In the second embodiment, the first resin layer 31a and the second resin layer 32a are connected by, for example, applying an adhesive to the edge 31e of the first separator 31 and the edge 32e of the second separator 32. But you can. In this case, the adhesive that connects the first resin layer 31a and the second resin layer 32a corresponds to the connecting portion.

In the third embodiment, only the first locking part 61 or the second locking part 62 may be formed.
(Circle) in 3rd Embodiment, the acicular member 60 may be formed, for example with polyethylene (PE).

  In the fourth embodiment, the tip of each needle portion 71 has a first ceramic layer 311b, a first resin layer 31a, a second ceramic layer 312b, a third ceramic layer 321b, a second resin layer 32a, and a fourth ceramic. The layer 322b may be penetrated. Further, when each needle portion 71 is pulled out from the first separator 31 and the second separator 32, a part of the first resin layer 31a protrudes from the outer surface of the first ceramic layer 311b, and the protruded first resin layer. A locking portion that locks to the outer surface of the first ceramic layer 311b may be formed by solidifying 31a. Similarly, a part of the second resin layer 32a is protruded on the outer surface of the fourth ceramic layer 322b, and the protruding second resin layer 32a is solidified to be locked to the outer surface of the fourth ceramic layer 322b. A stop may be formed.

  In each of the above embodiments, the ceramic layer may be disposed on at least one of the surfaces where the first separator 31 and the second separator 32 face each other. For example, the second ceramic layer 312b may be deleted, or the third ceramic layer 321b may be deleted.

In each of the above embodiments, the first ceramic layer 311b may be deleted, or the fourth ceramic layer 322b may be deleted. In short, it is sufficient that a ceramic layer is formed on at least one of the front and back surfaces of the first resin layer 31a. Similarly, the ceramic layer is formed on at least one of the front and back surfaces of the second resin layer 32a. Should just be formed.

In the above embodiments, the first resin layer 31a and the second resin layer 32a may be formed of, for example, polypropylene (PP) or aramid.
In each of the above embodiments, the first to fourth ceramic layers 311b, 312b, 321b, and 322b may be ceramic particles (ceramic powder) made of, for example, zirconia oxide.

In each of the above embodiments, the negative electrode sheet 13 may be stored in the electrode storage separators 30, 30A, 30B, 30C, 30D instead of the positive electrode sheet 12.
In each of the above embodiments, the electrode assembly 11 may be housed in the electrode housing separators 30, 30A, 30B, 30C, 30D.

In the above embodiments, the electrode storage separators 30, 30A, 30B, 30C, and 30D are not limited to bag shapes, and can be changed to other shapes such as a cylindrical shape, for example.
(Circle) in each said embodiment, the shape of the 1st separator 31 and the 2nd separator 32 is not limited to square shape, It can change suitably to another shape.

In each of the embodiments described above, the electrode assembly 11 is not limited to the laminated type, and may be a wound type configured with a number of layers of the positive electrode sheet and the negative electrode sheet.
In each of the above embodiments, the sheet-like positive electrode sheet 12 and the negative electrode sheet 13 are used as the positive electrode and the negative electrode. However, the present invention is not limited thereto. For example, a plate-like positive electrode and negative electrode having a predetermined amount of thickness may be used. Good.

(Circle) in each said embodiment, the raw material of the positive electrode sheet 12, the negative electrode sheet 13, the 1st separator 31, and the 2nd separator 32 can be changed suitably.
The present invention has been embodied in the vehicle secondary battery 10, but is not limited thereto, and may be embodied in a secondary battery other than the vehicle.

  The present invention has been embodied in the secondary battery 10, but is not limited thereto, and may be embodied in a power storage device such as an electric double layer capacitor.

  DESCRIPTION OF SYMBOLS 10 ... Secondary battery as power storage device, 11 ... Electrode assembly, 12 ... Positive electrode sheet as positive electrode as first electrode, 12c ... Positive electrode tab, 13 ... Negative electrode sheet as negative electrode as second electrode, 13c ... Negative electrode tab, 30, 30A, 30B, 30C, 30D ... Electrode storage separator, 30a ... Storage part, 30b ... Joint part, 30d ... Tab side joint part, 30e ... Bottom side joint part, 31 ... First separator, 31a ... First resin layer as a resin layer, 31e, 32e ... edge, 311b ... First ceramic layer as a ceramic layer, 312b ... Second ceramic layer as a ceramic layer, 32 ... Second separator, 32a ... As a resin layer Second resin layer, 321b ... third ceramic layer as ceramic layer, 322b ... fourth ceramic layer as ceramic layer, 40 ... pressing member 40a ... one end surface, 41 ... pressing part, 41a ... pressing surface, 41b ... chamfered part, 61 ... first locking part as locking part, 62 ... second locking part as locking part, 63 ... linking part , 81... Separator, W1, W2, W3... Welded portion as a connecting portion.

Claims (15)

A first separator and a second separator having a resin layer and facing each other, wherein the first separator is formed with a ceramic layer coated with ceramics on a surface facing the second separator,
Furthermore, the electrode storage separator which has the accommodating part which accommodates an electrode, and the junction part which joins the said 1st separator and the said 2nd separator on the edge side of the said 1st separator and the said 2nd separator rather than the said accommodating part. Because
In the ceramic layer, a connection portion that connects the resin layer of the first separator and the resin layer of the second separator is provided at a portion located in the joint portion.   The electrode housing separator according to claim 1, wherein the connecting portion penetrates the ceramic layer.   3. The electrode storage separator according to claim 1, wherein the connecting portion is provided at an inner side than edges of the first separator and the second separator in the joint portion.   The electrode storage separator according to any one of claims 1 to 3, wherein the ceramic layers are formed on both front and back surfaces of the resin layer.   In the resin layer, the ceramic layer is formed on a surface of the first separator and the second separator opposite to the surfaces facing each other and overlapping with the connecting portion. The electrode storage separator according to claim 4.   The electrode storage separator according to any one of claims 1 to 5, wherein the connecting portion is provided at an edge of the first separator and the second separator in the joint portion. .   The electrode storage separator according to any one of claims 1 to 6, wherein a plurality of the connecting portions are provided at predetermined intervals in the joint portion.   8. The method according to claim 1, further comprising an engaging portion that is continuous with the connecting portion and that engages with an outer surface opposite to a surface opposite to the first separator and the second separator. The electrode storage separator according to any one of the above.   The electrode storage separator according to any one of claims 1 to 8, wherein the connecting portion is formed by melting and solidifying a part of the resin layer.   The electrode has a tab protruding from an edge of the electrode, and the tab passes between the opposing surfaces of the first separator and the second separator and is more than the edges of the first separator and the second separator. Of the joining portions of the first separator and the second separator, the joining portion on the protruding edge side of the tab and the edge side opposite to the protruding edge of the tab across the storage portion The electrode storage separator according to any one of claims 1 to 9, wherein the total sum of the areas of the connecting portions is the same as the joining portion.   A first electrode is housed inside the electrode housing separator according to any one of claims 1 to 10, and the electrode housing separator and a second electrode having a different polarity from the first electrode; A power storage device comprising: an electrode assembly formed in layers.   The power storage device according to claim 11, wherein the power storage device is a secondary battery. A first separator and a second separator having a resin layer and facing each other, wherein the first separator is formed with a ceramic layer coated with ceramics on a surface facing the second separator,
Furthermore, a storage part for storing the electrode, and the first separator and the second than the storage part.
A method of manufacturing an electrode storage separator having a joining portion for joining the first separator and the second separator on an edge side of the separator,
While pressing the pressing member in a state where the pressing member is heated, a part of the resin layer is melted by the heat from the pressing member, and the part of the molten resin layer is caused to penetrate the ceramic layer. A method for producing an electrode storage separator, wherein a part of the molten resin layer is solidified.   A pressing portion that presses the joint portion protrudes from one end surface of the pressing member, and the pressing portion has a pressing surface to the joining portion at the tip, and a chamfered portion at the periphery of the pressing surface. The manufacturing method of the electrode storage separator of Claim 13.   The electrode has a tab protruding from an edge of the electrode, and the tab passes between the opposing surfaces of the first separator and the second separator and is more than the edges of the first separator and the second separator. Of the joining portions of the first separator and the second separator, the joining portion on the protruding edge side of the tab and the edge side opposite to the protruding edge of the tab across the storage portion The method of manufacturing an electrode storage separator according to claim 13 or claim 14, wherein the sum of the areas pressed by the pressing member is the same as that of the joint portion.