Electricity storage device and method for manufacturing the same

Abstract

The present application relates to an electricity storage device and a manufacturing method thereof. The electricity storage device is provided with a spacer between a sealing plate and an electrode body, the spacer having a pair of side walls extending to the electrode body side and arranged at a prescribed interval, and at least the outermost separator of the separators has an extension portion extending to the spacer side from the end portion of the negative electrode and the positive electrode, the extension portion being arranged inside the side walls or fixed to the side walls. According to the electricity storage device, when the electrode body is inserted into the housing main body, a step caused by bending of the end portion of the separator can be suppressed at the end portion of the electrode body.

Description

Technical Field

[0001] This technology relates to energy storage devices and their manufacturing methods. Background Technology

[0002] Japanese Patent Application Publication Nos. 2024-176302 and 2024-176297 disclose a technology related to a secondary battery and a method for manufacturing the same. Specifically, the following manufacturing process is disclosed: covering an electrode body, including a positive electrode plate and a negative electrode plate separated by a separator, with an insulating sheet, and inserting the electrode body covered by the insulating sheet into a cylindrical housing body. Summary of the Invention

[0003] At both ends of the electrode (the front and rear sides when inserted into the main body of the housing), the ends of the diaphragm protrude from the ends of the negative and positive electrodes. In this state, when the electrode is inserted into the cylindrical housing body, it is possible for the ends of the diaphragm to be bent.

[0004] In particular, it was discovered that in a structure in which a spacer is arranged between the sealing plate and the electrode body on the open end side of the main body of the housing, due to the pressing of the electrode body when it is inserted into the main body of the housing, the end of the diaphragm is bent under the mutual pushing of the spacer and the end of the diaphragm. The bends are stacked to form a step like a fold.

[0005] Furthermore, when the step reaches the end of the electrode body, it will face the active material layer disposed on the surfaces of the negative and positive electrodes of the electrode body. It has been found that when the step reaches the surface facing the active material layer, as the secondary battery is charged and discharged, there is a problem of Li precipitation occurring on the surfaces of the positive and negative electrodes due to the step.

[0006] This topic is not limited to secondary batteries, but also applies to energy storage devices that can be charged and discharged.

[0007] This technology was developed to solve the aforementioned problems, and its purpose is to provide an energy storage device and a method for manufacturing the same, which can suppress the formation of steps at the end of the electrode body caused by bending of the end of the diaphragm when the electrode body is inserted into the housing body.

[0008] This technology provides the following energy storage devices.

[0009] [1] An energy storage device comprising: an electrode body having a first electrode, a second electrode, and a diaphragm, the diaphragm being disposed between the first electrode and the second electrode and including an outermost diaphragm covering the outermost side; and a housing housing the electrode body, wherein the housing housing has: a housing body housing the electrode body internally and having an opening; and a sealing plate sealing the opening, a spacer being disposed between the sealing plate and the electrode body, the spacer having a pair of sidewalls extending toward the electrode body and spaced apart at predetermined intervals, the outermost diaphragm having an extension extending from the ends of the first electrode and the second electrode toward the spacer, the extension being disposed inside the sidewalls or fixed to the sidewalls.

[0010] [2] According to the energy storage device of [1], the electrode body has an electrode tab located on the opening side of the housing body and electrically connected to the electrode terminal disposed on the sealing plate, the electrode tab being connected through the spacer.

[0011] [3] According to the energy storage device of [2], the housing is a square cylindrical shape, the electrode body is a flat shape and has a first surface that is generally parallel to the sealing plate and faces each other, a pair of second surfaces that extend from the first surface in a vertical direction and are located on the long side, and a pair of third surfaces that extend from the first surface in a vertical direction and are located on the short side, the electrode tabs are disposed on the first surface side, the sidewall of the spacer has a first sidewall and a second sidewall that extend along the pair of second surfaces, the outermost diaphragm has a first outermost diaphragm and a second outermost diaphragm along the pair of second surfaces, the extension of the first outermost diaphragm is disposed or fixed to the inner side of the first sidewall, and the extension of the second outermost diaphragm is disposed or fixed to the inner side of the second sidewall.

[0012] [4] According to the energy storage device of [3], the first electrode and the second electrode are alternately stacked, and the diaphragm includes a portion folded between the first electrode and the second electrode and an outer peripheral portion disposed in such a way as to surround the outer side of the first electrode and the second electrode. As the outer peripheral portion, the first outermost diaphragm is disposed on the outermost side of one side and the second outermost diaphragm is disposed on the outermost side of the other side.

[0013] [5] According to the energy storage device of [4], all of the membranes located between the first electrode and the second electrode, except for the first outermost membrane and the second outermost membrane, have the extension portion, and all of the extension portions are housed in the inner space region between the first sidewall and the second sidewall.

[0014] [6] According to the energy storage device of [4] or [5], wherein the diaphragm is wound more than one turn on the outermost layer.

[0015] [7] The energy storage device according to any one of [4] to [6], wherein the diaphragm is fixed to the spacer at the four corners of the spacer.

[0016] [8] The energy storage device according to any one of [1] to [7], wherein the electrode body and the spacer are covered by an insulating sheet, the insulating sheet being fixed to the spacer.

[0017] This technology provides a method for manufacturing the following energy storage device.

[0018] [9] A method for manufacturing an energy storage device, the energy storage device comprising: an electrode body having a first electrode, a second electrode, and a diaphragm, the diaphragm being disposed between the first electrode and the second electrode and including an outermost diaphragm covering the outermost side; and a housing housing the electrode body, wherein the housing housing comprises: a housing body housing the electrode body internally and having an opening; and a sealing plate sealing the opening, a spacer being disposed between the sealing plate and the electrode body, the spacer having extending toward the electrode body and... A pair of sidewalls are arranged at a predetermined interval. The outermost diaphragm of the diaphragm has an extension extending from the ends of the first electrode and the second electrode toward the spacer side. The extension is disposed inside the sidewall or fixed to the sidewall. In the process of inserting the electrode body into the interior of the housing body from the opening, the spacer is arranged on the rear end side of the electrode body in the insertion direction and the extension of at least the outermost diaphragm is disposed inside the sidewall or fixed to the sidewall. The electrode body is inserted into the interior of the housing body.

[0019]

[10] According to the method of manufacturing the energy storage device described in [9], the electrode body has an electrode tab located on the opening side of the housing body and electrically connected to an electrode terminal disposed on the sealing plate, the electrode tab being connected through the spacer.

[0020]

[11] According to the manufacturing method of the energy storage device described in

[10] , the housing is a square cylindrical shape, the electrode body is a flat shape and has a first surface that is generally parallel to the sealing plate and faces each other, a pair of second surfaces that extend vertically from the first surface and are located on the long side, and a pair of third surfaces that extend vertically from the first surface and are located on the short side, the electrode tab is disposed on the first surface side, the sidewall of the spacer has a first sidewall and a second sidewall that extend along the pair of second surfaces, the outermost diaphragm has a first outermost diaphragm and a second outermost diaphragm along the pair of second surfaces, and the electrode body is inserted into the interior of the housing body in a state in which the extension of the first outermost diaphragm is disposed or fixed to the inner side of the first sidewall and the extension of the second outermost diaphragm is disposed or fixed to the inner side of the second sidewall.

[0021]

[12] In the method of manufacturing the energy storage device according to

[11] , the first electrode and the second electrode are alternately stacked, and the separator includes a portion folded between the first electrode and the second electrode and an outer peripheral portion disposed in such a way as to surround the outer side of the first electrode and the second electrode. As the outer peripheral portion, the first outermost separator is disposed on the outermost side of one side and the second outermost separator is disposed on the outermost side of the other side.

[0022]

[13] In the method of manufacturing the energy storage device according to

[12] , except for the first outermost diaphragm and the second outermost diaphragm, all of the diaphragms located between the first electrode and the second electrode have the extension portion, and all of the extension portions are housed in the space region on the inner side between the first sidewall and the second sidewall.

[0023]

[14] The method of manufacturing an energy storage device according to any one of

[12] to

[13] , wherein the diaphragm is wound more than one turn on the outermost layer.

[0024]

[15] A method for manufacturing an energy storage device according to any one of

[11] to

[14] , wherein the diaphragm is fixed to the spacer at the four corners of the spacer.

[0025]

[16] A method for manufacturing an energy storage device according to any one of [9] to

[15] , wherein the electrode body and the spacer are covered by an insulating sheet, the insulating sheet being fixed to the spacer.

[0026] The foregoing and other objects, features, aspects and advantages of the present invention will become clear from the following detailed description relating to the invention, which is understood in conjunction with the accompanying drawings. Attached Figure Description

[0027] Figure 1 This is a front view showing the structure of the energy storage device according to Embodiment 1.

[0028] Figure 2 This indicates viewing from the direction of arrow II. Figure 1 The diagram shows the state of the energy storage device.

[0029] Figure 3 This indicates viewing from the direction of arrow III. Figure 1 The diagram shows the state of the energy storage device.

[0030] Figure 4 This indicates viewing from the direction of arrow IV. Figure 1 The diagram shows the state of the energy storage device.

[0031] Figure 5 This indicates viewing from the direction of arrow V. Figure 1 The diagram shows the state of the energy storage device.

[0032] Figure 6 yes Figure 1 The front cross-sectional view of the energy storage device shown.

[0033] Figure 7 This is a cross-sectional view of the negative electrode.

[0034] Figure 8 This is the front view representing the negative pole.

[0035] Figure 9 This is a cross-sectional view of the positive electrode.

[0036] Figure 10 This is the front view representing the positive electrode.

[0037] Figure 11 This is a cross-sectional schematic diagram showing the structure at the end of the electrode body.

[0038] Figure 12 This is a flowchart illustrating the manufacturing method of an energy storage device.

[0039] Figure 13 This diagram shows the state in which the current collector is connected to the first electrode and the second electrode.

[0040] Figure 14 yes Figure 13 Sectional view along line XIV-XIV.

[0041] Figure 15 This diagram shows the state where the current collector on the negative electrode side is assembled with a sealing plate and the electrode body is assembled with spacers.

[0042] Figure 16 It is equivalent to Figure 15A cross-sectional view of the XVI-XVI line.

[0043] Figure 17 It is a cross-sectional view representing a subject in the reference technology.

[0044] Figure 18 This diagram illustrates the winding method of the diaphragm around the first electrode and the second electrode.

[0045] Figure 19 This diagram illustrates a winding method in which the diaphragm is wound around the first electrode and the second electrode in other ways.

[0046] Figure 20 This is a diagram showing the state of the electrode body with the insulating sheet installed.

[0047] Figure 21 This diagram shows the state in which an electrode body with an insulating sheet is inserted into the main body of the housing.

[0048] Figure 22 This diagram shows the state after the electrode body with the insulating sheet is inserted into the main body of the housing.

[0049] Figure 23 This diagram shows the state of the current collector with the sealing plate assembled on the positive side.

[0050] Figure 24 This diagram shows the state in which the opening of the main body of the shell is sealed.

[0051] Figure 25 This is a perspective view showing the structure of the spacer in Embodiment 1.

[0052] Figure 26 It is a three-dimensional diagram showing the structure of spacers in other ways.

[0053] Figure 27 It is a three-dimensional diagram showing the structure of a spacer in another manner.

[0054] Figure 28 This is a diagram showing the configuration relationship between spacers and diaphragms in other ways.

[0055] Figure 29 This is a diagram showing another configuration relationship between the spacer and the diaphragm. Detailed Implementation

[0056] The following describes the implementation of this technology. Furthermore, sometimes the same or corresponding parts are labeled with the same reference numerals, and their descriptions are not repeated.

[0057] In the embodiments described below, when numbers, quantities, etc., are mentioned, the scope of this technology is not necessarily limited to those numbers, quantities, etc., unless specifically stated otherwise. Furthermore, in the embodiments described below, each constituent element is not essential to this technology unless specifically stated otherwise. Additionally, this technology is not limited to achieving all the effects mentioned in these embodiments.

[0058] In this specification, terms such as "comprise," "include," and "have" are open-ended. That is, when a structure is included, other structures besides that structure may be included, or they may not be included.

[0059] In this specification, when using geometric terms and terms indicating positional and directional relationships, such as "parallel," "orthogonal," "tilted at 45°," "coaxial," and "along," these terms allow for errors or slight variations. In this specification, when using terms indicating relative positional relationships such as "upper side" and "lower side," these terms are used to indicate the relative positional relationship in a given state. By adjusting the orientation of each mechanism (e.g., reversing the overall vertical orientation of the mechanism), the relative positional relationship can be reversed or rotated to any angle.

[0060] In this specification, "energy storage device" may include not only lithium-ion batteries, but also nickel-metal hydride batteries and sodium-ion batteries. In this specification, "electrode" can be collectively referred to as the positive electrode and the negative electrode.

[0061] In the accompanying drawings, when the electrode body of the energy storage device is a stacked electrode body, the direction of the long side of the stacked surface is designated as the X direction; when the electrode body is a wound electrode body, the direction along the winding axis is designated as the X direction. Furthermore, when viewed from the X direction, the direction of the short side of the electrode body is designated as the Y direction, and the direction of the long side of the electrode body when viewed from the X direction is designated as the Z direction. For ease of understanding of the invention, some parts of the dimensions of the structures in the accompanying drawings are shown with variations from the actual dimensions.

[0062] In this specification, the X direction is sometimes referred to as the "width direction" of the energy storage device 1, the electrode body 200 and the housing body 110, the Z direction is referred to as the "height direction" of the energy storage device 1, the electrode body 200 and the housing body 110, and the Y direction is referred to as the "thickness direction" of the energy storage device 1, the electrode body 200 and the housing body 110.

[0063] (Implementation Method 1: Overall Structure of the Battery)

[0064] Figure 1 This is a front view of the energy storage device 1 according to Embodiment 1. Figures 2 to 5These represent observations from the directions of arrow II, arrow III, arrow IV, and arrow V, respectively. Figure 1 The diagram shows the state of the energy storage device 1. Figure 6 yes Figure 1 The front sectional view of the energy storage device 1 shown.

[0065] The energy storage device 1 can be installed in electric vehicles (BEVs), plug-in hybrid electric vehicles (PHEVs), and hybrid electric vehicles (HEVs). However, the application of the energy storage device 1 is not limited to vehicle use.

[0066] like Figures 1 to 6 As shown, the energy storage device 1 includes a housing 100, an electrode body 200, an electrode terminal 300, and a current collector 400. The housing 100 includes a housing body 110, a sealing plate 120, and a sealing plate 130.

[0067] When constructing a battery pack including energy storage devices 1, multiple energy storage devices 1 are arranged in their thickness direction. The arranged energy storage devices 1 can be constrained in the arrangement direction (Y direction) by a constraint member to form a battery module, or the battery pack can be directly supported on the side of the battery pack housing without using a constraint member.

[0068] The housing body 110 is composed of a cylindrical, preferably square cylindrical, component. This results in a square cylindrical energy storage device 1. The housing body 110 is made of metal. Specifically, the housing body 110 is made of aluminum, aluminum alloy, iron, or iron alloy, etc.

[0069] like Figure 1 as well as Figure 2 As shown, sealing plates 120 and 130 are respectively provided at both ends of the housing body 110. The housing body 110 is constructed, for example, by having the end edges of a bent plate-like member abut against each other. Figure 2 The illustrated joint 115 is joined together (e.g., by laser welding) to form a square cylindrical shape. The corners of the "square cylindrical shape" may also have rounded corners (R-shape). In addition, the energy storage device in this technology is not necessarily limited to a square cylindrical shape.

[0070] In this embodiment, the housing body 110 is formed to be longer in the width direction (X direction) than in the thickness direction (Y direction) and height direction (Z direction) of the energy storage device 1. The width of the housing body 110 in the X direction is preferably 30 cm or more. This allows for the construction of a relatively large (high-capacity) energy storage device 1. The height of the housing body 110 in the Z direction is preferably 20 cm or less, more preferably 15 cm or less, and even more preferably 10 cm or less. This allows for the construction of a relatively low-height energy storage device 1, for example, improving vehicle mountability.

[0071] The housing body 110 includes a pair of first side faces 111 and a pair of second side faces 112. The pair of first side faces 111 form part of the side face of the housing 100. The pair of second side faces 112 form the bottom surface and the top surface of the housing 100. The pair of first side faces 111 and the pair of second side faces 112 are arranged in a mutually intersecting manner. The pair of first side faces 111 and the pair of second side faces 112 are connected at their respective ends. The area of ​​each of the pair of first side faces 111 is larger than the area of ​​each of the pair of second side faces 112.

[0072] like Figure 5 As shown, a gas discharge valve 150 is provided on one of the pair of second side surfaces 112A. The gas discharge valve 150 extends along the width direction (X direction) of the energy storage device 1. The gas discharge valve 150 extends from the center of the housing body 110 in the X direction without reaching either end. The shape of the gas discharge valve 150 can be appropriately modified.

[0073] The thickness of the plate-like member in the gas discharge valve 150 is thinner than the thickness of the plate-like members other than the gas discharge valve 150 in the housing body 110. As a result, when the pressure inside the housing 100 reaches a predetermined value or higher, the gas discharge valve 150 breaks first compared to other parts in the housing body 110, discharging the gas inside the housing 100 to the outside.

[0074] like Figure 2 As shown, a joint portion 115 is formed on the other of the pair of second side surface portions 112B. The joint portion 115 extends in the width direction (X direction) of the energy storage device 1. In the joint portion 115, the end edges of the plate-shaped members constituting the housing body 110 are joined to each other.

[0075] like Figure 3As shown, an opening 113 (first opening) is provided at the end of the housing body 110 on the -X side in the X direction. The opening 113 is sealed by a sealing plate 120 (first sealing plate). A joint 115 is formed in the opening 113 to seal it. The opening 113 and the sealing plate 120 have a generally rectangular shape with the short side in the Y direction and the long side in the Z direction. The generally rectangular shape includes a rectangular shape or a shape whose corners are rounded (R-shaped), etc., that is substantially rectangular.

[0076] A negative terminal 301 (first electrode terminal) is provided on the sealing plate 120. The position of the negative terminal 301 can be changed appropriately. The negative terminal 301 is exposed on the outside of the sealing plate 120.

[0077] like Figure 4 As shown, an opening 114 (second opening) is provided at the end of the housing body 110 on the +X side in the X direction. The opening 114 is located at the end opposite to the opening 113, and the openings 113 and 114 face each other. The opening 114 is sealed by a sealing plate 130 (second sealing plate). A joint 115 is formed in the opening 114 to seal it. The opening 114 and the sealing plate 130 have a generally rectangular shape with the short side in the Y direction and the long side in the Z direction.

[0078] A positive terminal 302 (second electrode terminal) and a liquid injection hole 134 are provided on the sealing plate 130. The positions of the positive terminal 302 and the liquid injection hole 134 can be changed appropriately.

[0079] Sealing plates 120 and 130 are made of metal. Specifically, sealing plates 120 and 130 are made of aluminum, aluminum alloy, iron, or iron alloy.

[0080] The negative terminal 301 is electrically connected to the negative terminal of the electrode body 200. The negative terminal 301 is mounted on the sealing plate 120, i.e., the housing 100. The negative terminal 301 is made of a conductive material (more specifically, a metal), such as copper or a copper alloy. Alternatively, a portion or layer made of aluminum or an aluminum alloy may be provided on the outer surface of the negative terminal 301.

[0081] The positive terminal 302 is electrically connected to the positive terminal of the electrode body 200. The positive terminal 302 is mounted on the sealing plate 130, i.e., the housing 100. The positive terminal 302 is made of a conductive material (more specifically, a metal), such as aluminum or an aluminum alloy. The positive terminal 302 is exposed on the outside of the sealing plate 130.

[0082] The injection port 134 is sealed by a sealing member (not shown). Such sealing members can be, for example, blind rivets or other metal components.

[0083] Electrode body 200 is a flat electrode body having a positive electrode and a negative electrode (described later) stacked on top of each other. Specifically, electrode body 200 is a stacked electrode body in which multiple positive electrodes and multiple negative electrodes are alternately stacked with a separator (described later). In this specification, "electrode body" is not limited to a stacked electrode body, and may also be a wound electrode body in which strip-shaped positive electrodes and strip-shaped negative electrodes are wound together with a strip-shaped separator. The separator may, for example, be made of a microporous membrane made of polyolefin. When electrode body 200 is a stacked electrode body including multiple positive electrodes and multiple negative electrodes, positive electrode tabs disposed on each positive electrode can be stacked to form a positive electrode tab group, and negative electrode tabs disposed on each negative electrode can be stacked to form a negative electrode tab group.

[0084] like Figure 6 As shown, the housing 100 houses the electrode body 200. Figure 6 In the following section, the first electrode body 201, which will be described later, will be illustrated. The first electrode body 201 is housed within the housing 100 such that its long side is parallel to the X direction.

[0085] Specifically, the insulating sheet 700 disposed within the housing 100 (refer to...) Figure 15 Inside the electrode, one or more stacked electrode bodies are contained together with an electrolyte (not shown). A solid electrolyte may also be used instead of a liquid electrolyte.

[0086] The first electrode body 201 includes a generally rectangular main body, a negative electrode tab group 220, and a positive electrode tab group 250. The negative electrode tab group 220 is located at the -X side of the main body in the X direction. The positive electrode tab group 250 is located at the +X side of the main body in the X direction. At both ends of the first electrode body 201 (the negative electrode tab group 220 side and the positive electrode tab group 250 side), the ends of the diaphragm 800 are exposed, as will be described in detail later.

[0087] The negative electrode tab group 220 and the positive electrode tab group 250 are formed to protrude from the approximate central portion of the electrode body 200 toward the sealing plate 120 or the sealing plate 130, respectively.

[0088] The current collector 400 includes a negative current collector 400A and a positive current collector 400B. The electrode body 200 is electrically connected to the negative terminal 301 and the positive terminal 302 via the current collector 400.

[0089] The negative current collector 400A is electrically connected to the negative electrode tab assembly 220 and the negative terminal 301. The negative current collector 400A may be made of a conductive material (more specifically, a metal such as copper or a copper alloy).

[0090] The positive current collector 400B is electrically connected to the positive electrode tab assembly 250 and the positive terminal 302. The positive current collector 400B may be made of a conductive material (more specifically, a metal such as aluminum or an aluminum alloy).

[0091] (Structure of electrode body 200)

[0092] Figure 7 This is a cross-sectional view of the negative electrode 210 (first electrode). Figure 8 (Sectional view VII-VII in the middle) Figure 8 This is the front view representing the negative electrode 210.

[0093] like Figure 8 As shown, the negative electrode 210 includes a negative electrode core 211 and a negative electrode active material layer 212. The negative electrode core 211 is a copper foil or a copper alloy foil. The negative electrode active material layer 212 is formed by coating a negative electrode active material layer slurry using a die-coating machine.

[0094] A negative electrode tab 230, composed of a negative electrode core 211, is provided at one end of the negative electrode 210 in the width direction. When the negative electrodes 210 are stacked, multiple negative electrode tabs 230 are stacked to form a negative electrode tab group 220. The length of the protruding direction of each of the negative electrode tabs 230 in the multiple negative electrodes 210 is appropriately adjusted considering the connection state between the negative electrode tab group 220 and the negative electrode current collector 400A. The shape of the negative electrode tab 230 is not limited to... Figure 8 The illustrated shape.

[0095] Figure 9 This is a cross-sectional view of the positive electrode 240 (second electrode). Figure 10 (IX-IX section view) Figure 10 This is the front view representing the positive electrode 240.

[0096] like Figure 10 As shown, the positive electrode 240 has a different polarity than the negative electrode 210. The positive electrode 240 includes a positive electrode core 241, a positive electrode active material layer 242, and a positive electrode protective layer 243. The positive electrode core 241 is an aluminum foil or an aluminum alloy foil. The positive electrode active material layer 242 is formed on the positive electrode core 241 by applying a positive electrode active material layer slurry using a die-coating machine.

[0097] A positive electrode tab 260, composed of a positive electrode core 241, is provided at one end of the positive electrode 240 in the width direction. When the positive electrodes 240 are stacked, multiple positive electrode tabs 260 are stacked to form a positive electrode tab group 250. The length of each positive electrode tab 260 in the protruding direction among the multiple positive electrodes 240 is appropriately adjusted considering the connection state between the positive electrode tab group 250 and the positive current collector 400B. The shape of the positive electrode tab 260 is not limited to... Figure 10 The illustrated shape.

[0098] The positive electrode protection layer 243 is disposed at the root of the positive electrode tab 260. However, it is not necessary to provide the positive electrode protection layer 243.

[0099] In a typical example, the thickness of the negative electrode tab 230 (one piece) is less than the thickness of the positive electrode tab 260 (one piece). In this case, the thickness of the negative electrode tab group 220 is less than the thickness of the positive electrode tab group 250.

[0100] like Figure 11 As shown, the first electrode body 201 is formed by alternating layers of negative electrode 210 and positive electrode 240. A separator 800 is disposed between the negative electrode 210 and the positive electrode 240. The separator 800 disposed between the negative electrode 210 and the positive electrode 240 can be folded and bent between the negative electrode 210 and the positive electrode 240. It can be arranged in a reciprocating manner between the negative electrode 210 and the positive electrode 240. The arrangement of the separator 800 between the negative electrode 210 and the positive electrode 240 will be described later.

[0101] The diaphragm 800 may also include a folded portion between the negative electrode 210 and the positive electrode 240 and an outer peripheral portion surrounding the negative electrode 210 and the positive electrode 240. Alternatively, the portion between the negative electrode 210 and the positive electrode 240 and the outer peripheral portion surrounding the negative electrode 210 and the positive electrode 240 may be provided separately. The portion between the negative electrode 210 and the positive electrode 240 is not limited to a folded structure of a strip-shaped diaphragm 800; rectangular diaphragms may also be provided individually.

[0102] The ends of the diaphragm 800 on the negative electrode tab group 220 side and the positive electrode tab group 250 side are configured to have extensions 800e such that the ends of the diaphragm 800 protrude from the ends of the negative electrode 210 and the positive electrode 240. For example... Figure 11 As shown, for example, the protruding length (length of extension 800e) L of the end of the diaphragm 800 is appropriately adjusted by taking into account the distance from the end of the negative electrode 210 to the opening 113 on the negative electrode side and the distance from the end of the positive electrode 240 to the opening 114 on the positive electrode side.

[0103] (Manufacturing process of energy storage device 1)

[0104] The manufacturing method of the energy storage device according to this embodiment will be described below. Figure 12 This is a flowchart illustrating the manufacturing method of the energy storage device 1.

[0105] like Figure 12As shown, the method for manufacturing the energy storage device 1 includes: a step (S1) of fabricating a first electrode body 201 and a second electrode body 202; a step (S2) of joining a negative electrode tab group 220 and a negative electrode tab group 270 to a current collector 410; a step (S3) of joining a positive electrode tab group 250 to a current collector 420; a step (S4) of joining a positive electrode tab group 280 to a current collector 420; a step (S5) of overlapping the first electrode body 201 and the second electrode body 202; and a step of electrically connecting the current collector 410 joined with the negative electrode tab group 220 and the negative electrode tab group 270 to the negative terminal 301. S6) Steps of installing spacer 600 on electrode body 200; S7) Steps of covering electrode body 200 with insulating sheet; S8) Steps of inserting first electrode body 201 and second electrode body 202 into housing body 110; S9) Steps of electrically connecting current collector 420, which is connected to positive electrode tab group 250, 280, to positive terminal 302; S11 Steps of sealing openings 113, 114 by connecting sealing plates 120, 130 to housing body 110; Steps of performing leakage inspection; and Steps of injecting electrolyte; and S13 Steps of injecting electrolyte.

[0106] Figures 13-24 This is a diagram showing the various steps in the manufacturing method of the energy storage device 1. In the step (S1) of manufacturing the first electrode body 201 and the second electrode body 202, it is preferable that a portion of the front end of each of the negative electrode tab group 220, the positive electrode tab group 250, the negative electrode tab group 270 and the positive electrode tab group 280 is cut off so that the length of the front end is the same when bundled.

[0107] Reference Figure 13 as well as Figure 14 After fabricating the first electrode body 201 and the second electrode body 202, the negative electrode tabs 220 and 270 are joined to the current collector 410 (S2), the positive electrode tab 250 is joined to the current collector 420 (S3), and the positive electrode tab 280 is joined to the current collector 420 (S4).

[0108] Negative electrode tabs 220 and 270 are engaged with current collector 410 at junction 411. Positive electrode tab 250 is engaged with current collector 420 at junction 421. Positive electrode tab 280 is engaged with current collector 420 at junction 421.

[0109] The current collector 420, the first electrode 201, the current collector 410, the second electrode 202, and the current collector 420 are arranged sequentially in the direction of arrow DR1.

[0110] exist Figure 13In the example, in the height direction of the first electrode 201 and the second electrode 202, the current collectors 410 and 420 are disposed offset to one side from the center of the first electrode 201 and the second electrode 202. In the height direction of the first electrode 201 and the second electrode 202, the negative electrode tab group 220, the positive electrode tab group 250, the negative electrode tab group 270, and the positive electrode tab group 280 are respectively disposed offset to one side from the center of the first electrode 201 and the second electrode 202.

[0111] The scope of this technology is not limited thereto. Current collectors 410 and 420 may also be disposed at the center of the first electrode 201 and the second electrode 202 in the height direction of the first electrode 201 and the second electrode 202. Alternatively, negative electrode tab group 220, positive electrode tab group 250, negative electrode tab group 270, and positive electrode tab group 280 may be disposed at the center of the first electrode 201 and the second electrode 202 in the height direction of the first electrode 201 and the second electrode 202, respectively.

[0112] like Figure 15 As shown, in the thickness direction of the first electrode body 201 and the second electrode body 202 (and... Figure 13 and Figure 14 In a direction orthogonal to DR1, the negative electrode tab group 220 and the negative electrode tab group 270 are bent so that the first electrode body 201 and the second electrode body 202 overlap (S5). Here, the negative electrode tab group 220 and the negative electrode tab group 270 are bent with their front ends facing each other. The bending direction of the negative electrode tab group 220 and the negative electrode tab group 270 is not limited to the direction in which their front ends face each other.

[0113] When the first electrode 201 and the second electrode 202 are "overlapped", they can either overlap directly, or other components can be placed between them. The first electrode 201 and the second electrode 202 can be fixed with tape or not.

[0114] The electrode body 200 formed by the overlapping of the first electrode body 201 and the second electrode body 202 is a flat square shape, having a first surface 200a that is generally parallel to and faces the sealing plate 120, a pair of second surfaces 200b that extend vertically from the first surface 200a and are located on the long side, and a pair of third surfaces 200c that extend vertically from the first surface 200a and are located on the short side.

[0115] like Figure 15As shown, the current collector 410, which is connected to the negative electrode tab group 220 and the negative electrode tab group 270, is assembled on the sealing plate 120 (S6). The negative terminal 301 is pre-installed on the sealing plate 120. Thus, the current collector 410 is electrically connected to the negative terminal 301 (S5).

[0116] Next, spacers 600 are installed on the negative and positive sides of the electrode body 200 (S7). The detailed structure of the spacers 600 will be described later. On the negative side, the spacers 600 are installed on the electrode body 200 such that negative electrode tabs 220 and 270 are accommodated in the opening 670 of the spacers 600. On the positive side, the spacers 600 are installed on the electrode body 200 such that positive electrode tabs 250 and 280 are accommodated in the opening 670 of the spacers 600.

[0117] Reference Figure 16 When the spacer 600 is installed on the negative electrode side and the positive electrode side of the electrode body 200, at least the extension 800e of the outermost first outermost diaphragm 800a on one side of the electrode body 200 is arranged to be located inside the third sidewall 614 of the spacer 600, and the extension 800e of the outermost second outermost diaphragm 800b on the other side is arranged to be located inside the fourth sidewall 615.

[0118] The third sidewall 614 and the fourth sidewall 615 are sidewalls that extend from the first base 610 and the second base 620 of the spacer 600 toward the electrode body 200. The inner side of the third sidewall 614 and the inner side of the fourth sidewall 615 refer to the spatial region 600X in which the third sidewall 614 and the fourth sidewall 615 face each other.

[0119] Thus, by arranging the first outermost diaphragm 800a and the second outermost diaphragm 800b located on the outermost sides of the electrode body 200 in a space region 600X located inside the third sidewall 614 and the fourth sidewall 615 of the spacer 600, the diaphragm 800 located inside the first outermost diaphragm 800a becomes a state in which it is received in the space region 600X between the third sidewall 614 and the fourth sidewall 615. As a result, when the electrode body 200 is inserted into the housing body 110 as a subsequent process, it is possible to prevent the extension 800e (end) of the diaphragm 800 from accidentally bending.

[0120] In this embodiment, the diaphragm 800 has all extensions 800e, and all extensions 800e are housed in the space region 600X inside the third sidewall 614 and the fourth sidewall 615, thereby preventing all extensions 800e from accidentally bending.

[0121] Figure 16The relationship between the diaphragm 800 and the spacer 600 on the positive electrode side is shown, but the same applies to the negative electrode side. For example, when the electrode body 200 is inserted into the housing body 110, with the positive electrode side being the front side of the insertion direction and the negative electrode side being the rear side of the insertion direction, the negative electrode side (rear side) is pressed and forced into the housing body 110. Therefore, it is preferable to have a structure that shows the relationship between the diaphragm 800 and the spacer 600 as described above, at least on the negative electrode side.

[0122] Reference Figure 17 The following describes a reference technology where the spacer 600 does not have a third sidewall 614 and a fourth sidewall 615. The end of the diaphragm 800 is in direct contact with the first base 610 and the second base 620 of the spacer 600. As a result, the end of the spacer 600 is bent and stacked to form a step-like fold. If this step reaches the end of the electrode body, it may face the active material layer disposed on the surface of the positive and negative electrode plates. As the energy storage device charges and discharges, Li may be deposited on the surface of the positive and negative electrode plates due to this step.

[0123] However, in the structure of this disclosure, as described above, accidental bending of the end of the diaphragm 800 can be suppressed, and as a result, Li precipitation on the surfaces of the positive and negative plates can be suppressed.

[0124] Reference Figure 18 The arrangement of the diaphragm 800 between the negative electrode 210 and the positive electrode 240 in the first electrode body 201 will be described. The second electrode body 202 is similarly configured, so the description is omitted here. The diaphragm 800 is, for example, a sheet, arranged in a reciprocating manner between the negative electrode 210 and the positive electrode 240. The outermost diaphragm 800 on one side is called the first outermost diaphragm 800a, and the outermost diaphragm 800 on the other side is called the second outermost diaphragm 800b. The diaphragm 800 can be fixed at the four corners of the spacer 600 using fixing members 900 such as tape or welding.

[0125] Reference Figure 19 As Figure 18 In another configuration of the diaphragm 800 shown, the diaphragm 800 is configured with an additional turn at the outermost layer. Alternatively, the diaphragm 800 may be wound more than once instead of just one turn.

[0126] like Figure 18 and Figure 19As shown, when the diaphragm 800 is repeatedly folded and bent, comparing the extension 800e of the diaphragm 800 located on the second surface 200b side of the electrode body 200 with the extension 800e of the diaphragm 800 located on the third surface 200c side, the extension 800e of the diaphragm 800 located on the second surface 200b side becomes a zigzag shape. As a result, the zigzag-shaped extension 800e is more difficult to bend. Therefore, the extension 800e can also be provided only on the diaphragm 800 located on the second surface 200b side of the electrode body 200. The same applies to the electrode bodies wound around the negative electrode 210 and the positive electrode 240.

[0127] It should be noted that in the case of a single-piece configuration where the diaphragm 800 is configured piece by piece between the negative electrode 210 and the positive electrode 240 instead of a single piece, a mountain-shaped bend will not be formed. Therefore, the extension of the diaphragm 800 can be provided not only on the first surface 200a side, but also on the second surface 200b side.

[0128] Next, as Figure 20 As shown, the electrode body 200 is covered by an insulating sheet 700 (S8). When the electrode body 200 is covered by the insulating sheet 700, the spacer 600 can also be covered by the insulating sheet 700. The insulating sheet 700 can be fixed in the fixing area R1 of the spacer 600 in an overlapping state at the upper surface of the spacer 600. The overlap length of the insulating sheet 700 in the upper surface of the spacer 600 can be about 0.1 mm to 4.2 mm.

[0129] like Figure 21 As shown, in the state where the electrode body 200 and the spacers 600 on both sides are covered by the insulating sheet 700 (hereinafter, this state is simply referred to as electrode body 200), the current collector 420 side, which is the positive electrode side, is taken as the front side (front head), and the current collector 410 side, which is the negative electrode side, is taken as the rear side, and the electrode body 200 is inserted into the housing body 110 (S9).

[0130] like Figure 22 As shown, when the electrode body 200 is inserted into the housing body 110 (in the direction of arrow F in the figure), the area of ​​the electrode body 200 near the negative electrode side is held by a robotic arm HD, and the positive electrode side is inserted with the electrode body pressed from the negative electrode side. The electrode body 200 is inserted into the housing body 110 using the robotic arm HD until it reaches about 80% to 90% of its width. Then, the rear side (negative electrode side) of the electrode body 200 is inserted with the electrode body pressed.

[0131] At this time, as described above, the end of the diaphragm 800 is housed in the space region 600X provided on the third sidewall 614 and the fourth sidewall 615 of the spacer 600. As a result, even when the diaphragm 800 is inserted into the housing body 110 with the rear side (negative electrode side) of the electrode body 200 pressed down, accidental bending of the end of the diaphragm 800 can be prevented. Furthermore, the electrode body 200 can also be pulled from the positive electrode side.

[0132] like Figure 23 As shown, after the electrode body 200 is inserted into the housing body 110, the current collector 420, which is engaged with the positive electrode tab group 250 and the positive electrode tab group 280, is assembled onto the sealing plate 130. The positive terminal 302 is pre-installed on the sealing plate 130. As a result, the current collector 430 is electrically connected to the positive terminal 302 (S10).

[0133] like Figure 24 As shown, sealing plate 120 and sealing plate 130 are engaged with housing body 110 (S11). Sealing plate 120 seals opening 113 of housing body 110, and sealing plate 130 seals opening 114 of housing body 110. Thus, electrode body 200 is housed in housing 100.

[0134] After the above procedures, a leak check and other inspections are performed (S12). After the leak check, the energy storage device 1 is dried to remove moisture from the casing 100. Electrolyte is injected into the interior of the casing 100 through the injection hole 134 (S13). When injecting the electrolyte, the casing 100 is tilted with the sealing plate 130 facing upwards and the sealing plate 120 facing downwards, and the electrolyte is injected into the interior of the casing 100 through the injection hole 134 of the sealing plate 130. Then, venting and charging are performed. During venting and charging, the injection hole 134 can also be temporarily sealed. Then, the injection hole 134 is sealed, and the energy storage device 1 is completed.

[0135] The order of the insertion process of electrode 200 and the connection process of current collector is not limited to the above example. For example, the order of the joining process (S2 to S5) of current collector 410 and current collector 420 can be appropriately changed.

[0136] In this embodiment, an example is described in which the current collector 420 is electrically connected to the positive terminal 302 (S10) after the electrode body 200 is inserted into the housing body 110 (S9) and the electrode body 200 is fully disposed in the housing body 110. However, it is also possible to electrically connect the electrode body 200 to the positive terminal 302 (S10) before the electrode body 200 is completely inserted into the housing body 110 (S9) (midway through the insertion process).

[0137] In this embodiment, the electrode body 200 is inserted into the housing body 110 with the current collector 420 side as the positive electrode side as the front side and the current collector 410 side as the negative electrode side as the rear side (S9). However, it is also possible to insert the electrode body 200 into the housing body 110 with the current collector 410 side as the negative electrode side as the front side and the current collector 420 side as the positive electrode side as the rear side.

[0138] (Spacer 600)

[0139] Reference Figure 25 The detailed structure of the spacer 600 will be described below. The spacer 600 is preferably a resin molded product. The spacer 600 is generally rectangular in shape. The spacer 600 has a first base 610 and a second base 620 with rectangular shapes. The first base 610 and the second base 620 are arranged at a predetermined interval.

[0140] The first base 610 has a pair of first sidewalls 611 and second sidewalls 613 extending vertically from the first base 610. The other side of the first base 610 has a third sidewall 614 extending in the opposite direction to the first sidewall 611 and a fourth sidewall 615 extending in the opposite direction to the second sidewall 613.

[0141] The second sidewall 613 and the fourth sidewall 615 are provided continuously to the second base 620. On one side of the second base 620, a first sidewall 611 is provided facing the second sidewall 613. On the other side of the second base 620, a third sidewall 614 is provided facing the fourth sidewall 615.

[0142] Since the first sidewall 611 and the third sidewall 614 are discontinuously disposed on the first base 610 and the second base 620, an opening 670 is formed in the spacer 600. This opening 670 becomes an area for the negative electrode tab group and the positive electrode tab group to pass through when the spacer 600 is installed to the electrode body 200.

[0143] When the spacer 600 is installed onto the electrode body 200, the side with the first sidewall 611 and the second sidewall 613 is positioned facing the sealing plate, and the side with the third sidewall 614 and the fourth sidewall 615 is positioned facing the first surface 200a of the electrode body 200. Therefore, the extension 800e of the diaphragm 800 is accommodated in the space region 600X inside the third sidewall 614 and the fourth sidewall 615.

[0144] (Spacer 600A)

[0145] Reference Figure 26The construction of another type of spacer 600A will be described. Its construction is essentially the same as that of spacer 600 described above. Spacer 600A has a first connecting plate 616 on the upper end side of the first base 610 (opposite to the second base 620) connecting the first sidewall 611 and the third sidewall 614 to the second sidewall 613 and the fourth sidewall 615. Similarly, a second connecting plate 626 is provided on the lower end side of the second base 620 (opposite to the first base 610) connecting the first sidewall 611 and the third sidewall 614 to the second sidewall 613 and the fourth sidewall 615.

[0146] By arranging the first connecting plate 616 and the second connecting plate 626 in this way, the rigidity of the spacer 600A can be improved compared with that of the spacer 600.

[0147] (Spacer 600B)

[0148] Reference Figure 27 The following describes the construction of another type of spacer 600B. The construction is essentially the same as that of spacer 600A described above. Spacer 600B has a two-part construction, having a first partition spacer 600B1 and a second partition spacer 600B2, the first partition spacer 600B1 and the second partition spacer 600B2 having symmetrical shapes.

[0149] When installing the spacer 600B onto the electrode body 200, it can be installed by clamping the negative electrode tab assembly and the positive electrode tab assembly from the second surface 200b side of the electrode body 200.

[0150] (Other configuration relationships between spacer 600 and diaphragm 800)

[0151] Reference Figure 28 and Figure 29 Other configuration relationships between the spacer 600 and the diaphragm 800 will be explained. Figure 16 In the arrangement of the spacer 600 and the diaphragm 800 shown, the first outermost diaphragm 800a and the second outermost diaphragm 800b located on the outermost side of the electrode body 200 are arranged in a space region 600X located inside the first sidewall 611 and the second sidewall 613 of the spacer 600.

[0152] exist Figure 28 In the illustrated method, the first outermost diaphragm 800a is fixed to the inner side of the third sidewall 614 using a fixing member 641 such as adhesive tape. Similarly, the second outermost diaphragm 800b is fixed to the inner side of the fourth sidewall 615 using a fixing member 642 such as adhesive tape.

[0153] exist Figure 29In the illustrated configuration, the front end portion 810a of the first outermost diaphragm 800a is not fixed to the inner side of the third sidewall 614 using a fixing member 641, but is instead fixed to the end face of the electrode body 200 using a fixing member 641. Similarly, the front end portion 810b of the second outermost diaphragm 800b is not fixed to the inner side of the fourth sidewall 615 using a fixing member 642, but is instead fixed to the end face of the electrode body 200 using a fixing member 642.

[0154] By adopting a structure in which the first outermost diaphragm 800a and the second outermost diaphragm 800b are pre-fixed to the spacer 600, the positional relationship between the electrode body 200 and the spacer 600 can be stabilized during the manufacturing process of the electrode body 200, so that the electrode body 200 can be inserted into the housing body 110.

[0155] Embodiments of the present invention have been described, but should be considered as illustrative in all respects and not restrictive. The scope of the invention is set forth in the claims and is intended to include all modifications within the meaning and scope equivalent to the claims.

Claims

1. An energy storage device, comprising: an electrode body having a first electrode, a second electrode, and a diaphragm, the diaphragm being disposed between the first electrode and the second electrode and including an outermost diaphragm covering the outermost side; and a housing housing the electrode body, wherein, The housing has: A housing body that houses the electrode body internally and has an opening; as well as A sealing plate, which seals the opening. A spacer is provided between the sealing plate and the electrode body. The spacer has a pair of sidewalls extending toward the electrode body and spaced apart by a predetermined interval. The outermost diaphragm in the diaphragm has an extension extending from the ends of the first electrode and the second electrode toward the spacer side, the extension being disposed on the inner side of the sidewall or fixed to the sidewall.

2. The energy storage device according to claim 1, wherein, The electrode body has electrode tabs located on the opening side of the housing body and electrically connected to electrode terminals disposed on the sealing plate. The electrode tabs are passed through the spacer.

3. The energy storage device according to claim 2, wherein, The shell is a square cylindrical shape. The electrode body is flat and has a first surface that faces each other and is substantially parallel to the sealing plate, a pair of second surfaces that extend vertically from the first surface and are located on the long side, and a pair of third surfaces that extend vertically from the first surface and are located on the short side. The electrode tabs are disposed on the first surface side. The spacer has a first sidewall and a second sidewall extending along a pair of second surfaces. The outermost diaphragm has a first outermost diaphragm and a second outermost diaphragm along a pair of second surfaces. The extension of the first outermost diaphragm is disposed on or fixed to the inner side of the first sidewall. The extension of the second outermost diaphragm is disposed on or fixed to the inside of the second sidewall.

4. The energy storage device according to claim 3, wherein, The first electrode and the second electrode are stacked alternately. The diaphragm includes a folded portion between the first electrode and the second electrode and an outer peripheral portion disposed to surround the outer sides of the first electrode and the second electrode. As the outer peripheral portion, a first outermost diaphragm is disposed on the outermost side of one side, and a second outermost diaphragm is disposed on the outermost side of the other side.

5. The energy storage device according to claim 4, wherein, Except for the first outermost membrane and the second outermost membrane, all the membranes located between the first electrode and the second electrode have the extension portion, and all the extension portions are housed in the inner space region between the first sidewall and the second sidewall.

6. The energy storage device according to claim 4, wherein, The diaphragm is wound more than one turn on the outermost layer.

7. The energy storage device according to claim 3, wherein, The diaphragm is fixed to the spacer at the four corners of the spacer.

8. The energy storage device according to claim 1, wherein, The electrode body and the spacer are covered by an insulating sheet. The insulating sheet is fixed to the spacer.

9. A method for manufacturing an energy storage device, the energy storage device comprising: an electrode body having a first electrode, a second electrode, and a separator, the separator being disposed between the first electrode and the second electrode and including an outermost separator covering the outermost layer; and a housing housing the electrode body, wherein... The housing has: A housing body that internally houses the electrode body and has an opening; as well as A sealing plate, which seals the opening. A spacer is provided between the sealing plate and the electrode body. The spacer has a pair of sidewalls extending toward the electrode body and spaced apart by a predetermined interval. The outermost diaphragm of the diaphragm has an extension extending from the ends of the first electrode and the second electrode toward the spacer side, the extension being disposed on the inner side of the sidewall or fixed to the sidewall. In the process of inserting the electrode body into the interior of the housing body from the opening, the electrode body is inserted into the interior of the housing body with the spacer arranged on the rear end side of the electrode body in the insertion direction and the extension of at least the outermost diaphragm arranged on the inside of the sidewall or fixed to the sidewall.

10. The method for manufacturing an energy storage device according to claim 9, wherein, The electrode body has electrode tabs located on the opening side of the housing body and electrically connected to electrode terminals disposed on the sealing plate. The electrode tabs are passed through the spacer.

11. The method for manufacturing an energy storage device according to claim 10, wherein, The shell is a square cylindrical shape. The electrode body is flat and has a first surface that faces each other and is substantially parallel to the sealing plate, a pair of second surfaces that extend vertically from the first surface and are located on the long side, and a pair of third surfaces that extend vertically from the first surface and are located on the short side. The electrode tabs are disposed on the first surface side. The spacer has a first sidewall and a second sidewall extending along a pair of second surfaces. The outermost diaphragm has a first outermost diaphragm and a second outermost diaphragm along a pair of second surfaces. With the extension of the first outermost diaphragm configured or fixed to the inside of the first sidewall and the extension of the second outermost diaphragm configured or fixed to the inside of the second sidewall, the electrode body is inserted into the interior of the housing body.

12. The method for manufacturing an energy storage device according to claim 11, wherein, The first electrode and the second electrode are stacked alternately. The diaphragm includes a folded portion between the first electrode and the second electrode and an outer peripheral portion disposed to surround the outer sides of the first electrode and the second electrode. As the outer peripheral portion, a first outermost diaphragm is disposed on the outermost side of one side, and a second outermost diaphragm is disposed on the outermost side of the other side.

13. The method for manufacturing an energy storage device according to claim 12, wherein, Except for the first outermost membrane and the second outermost membrane, all the membranes located between the first electrode and the second electrode have the extension portion, and all the extension portions are housed in the inner space region between the first sidewall and the second sidewall.

14. The method for manufacturing an energy storage device according to claim 12, wherein, The diaphragm is wound more than one turn on the outermost layer.

15. The method for manufacturing an energy storage device according to claim 11, wherein, The diaphragm is fixed to the spacer at the four corners of the spacer.

16. The method for manufacturing an energy storage device according to claim 9, wherein, The electrode body and the spacer are covered by an insulating sheet. The insulating sheet is fixed to the spacer.

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