Secondary battery cell

Abstract

To provide a secondary battery cell having a frame body which can discharge a gas while hardly leaking an electrolytic solution or the like.SOLUTION: A secondary battery cell 5 comprises: a positive electrode that includes a positive electrode collector 10 having a first surface and a positive electrode composition layer 11 that is provided onto the first surface so that a peripheral edge part of the first surface is exposed; a negative electrode that includes a negative electrode collector 20 having a second surface that becomes the positive electrode side and a negative electrode composition layer that is provided onto the second surface so that the peripheral edge part of the second surface is exposed; and a frame body 40 that is provided to between the peripheral edge part of the first surface and the peripheral edge part of the second surface, and covers at least one part of a side surface of the positive electrode composition layer and the side surface of the negative electrode composition layer. The frame body includes a flow channel having a liquid-repellent property and / or a serpentine shaped flow channel 41 from an inner peripheral edge of them to an outer peripheral edge.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a secondary battery cell. [Background technology]

[0002] Secondary batteries such as lithium-ion secondary batteries that can be repeatedly charged and discharged are widely used in various technical fields such as smartphones, personal computers, electric vehicles, hybrid vehicles, stationary power storage applications, etc. For example, a lithium-ion secondary battery has a battery cell in which a positive electrode, a negative electrode, and a frame are stacked so as to face each other with a separator interposed therebetween.

[0003] In such secondary batteries, gas is generated inside the battery cell due to the initial charging, aging, and the like. It is generally known that the accumulation of this gas inside the battery cell leads to a decrease in battery performance. In order to prevent this gas from accumulating, it is necessary to release the gas to the outside of the battery cell. As a battery having a mechanism for releasing this gas, for example, a bipolar battery has been disclosed that has a gas release means for a sealing portion, and that the gas release means for a sealing portion is formed so that the adhesive strength of at least a portion of the sealing portion is lower than that of the other sealing portions (see, for example, Patent Document 1). Patent Document 1 describes, for example, inserting a foreign object into at least a portion of the sealing portion, and making a cut in at least a portion of the sealing portion.

[0004] However, the gas release means for the seal portion disclosed in Patent Document 1 requires that at least a part of the seal portion be peeled off or torn off. For example, when a liquid electrolyte containing an electrolytic solution is used for the positive electrode or the negative electrode, there is a risk that the electrolytic solution or the like will leak from the peeled off or torn part of the seal portion. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 4774705 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made to solve the problems of the conventional technology as described above. That is, an object of the present invention is to provide a secondary battery cell including a frame that is capable of releasing gas while preventing leakage of electrolyte and the like. [Means for solving the problem]

[0007] In order to achieve the above object, the invention described in claim 1 is a secondary battery cell comprising: a positive electrode having a positive electrode current collector having a first surface, and a positive electrode composition layer provided on the first surface such that a peripheral portion of the first surface is exposed; a negative electrode having a negative electrode current collector having a second surface serving as the positive electrode, and a negative electrode composition layer provided on the second surface such that a peripheral portion of the second surface is exposed; and a frame provided between the peripheral portions of the first surface and the second surface, covering at least a part of a side surface of the positive electrode composition layer and a side surface of the negative electrode composition layer, wherein the frame has a liquid-repellent flow path and / or a serpentine flow path extending from an inner peripheral edge to an outer peripheral edge thereof. Effect of the Invention

[0008] According to the present invention, it is possible to provide a secondary battery cell including a frame that is capable of releasing gas while preventing leakage of electrolyte and the like. [Brief description of the drawings]

[0009] [Figure 1] 1 is an exploded perspective view showing a schematic diagram of a secondary battery cell according to an embodiment of the present invention; [Diagram 2] 1 is a perspective view showing a schematic diagram of a secondary battery cell according to an embodiment of the present invention; [Diagram 3] FIG. 2 is a perspective view showing a schematic diagram of a process for producing a frame member according to an embodiment of the present invention. [Figure 4] FIG. 2 is a schematic cross-sectional view showing a flow path (space) according to one example of an embodiment of the present invention. [Diagram 5] 1 is a schematic cross-sectional view of a secondary battery in which a plurality of battery cells according to an embodiment of the present invention are stacked. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] In this specification, "and / or" means at least one of the two. For example, "X and / or Y" means X only, Y only, or both X and Y.

[0011] Hereinafter, an embodiment of the present invention (the present embodiment) will be described with reference to the drawings. In the drawings, the same reference numerals are used for similar components. Also, the dimensional ratios in the drawings may be exaggerated for the convenience of explanation and may differ from the actual ratios. Also, hereinafter, a plan view indicates that an object is viewed from the stacking direction of the battery cells.

[0012] <Secondary battery> First, the secondary battery according to the present embodiment will be described. The secondary battery is used in the form of a battery pack in which a plurality of secondary battery cells (hereinafter also simply referred to as battery cells) are combined into a module. The secondary battery is, for example, a lithium ion secondary battery. Below, an example in which the secondary battery according to the present embodiment is configured as a lithium ion secondary battery will be described.

[0013] <Secondary battery cell> Next, a secondary battery cell will be described. FIG. 1 is an exploded perspective view that shows a schematic diagram of a secondary battery cell. As shown in FIG. 1, a secondary battery cell (battery cell 5) has a rectangular parallelepiped shape as a whole, and includes a positive electrode 1, a negative electrode 2, a separator 30, and a frame 40. The positive electrode 1 includes a positive electrode current collector 10 and a positive electrode composition layer 11 arranged on the lower surface (front surface (first surface)) of the positive electrode current collector 10 in the figure. The negative electrode 2 includes a negative electrode current collector 20 and a negative electrode composition layer 21 arranged on the upper surface (front surface (second surface)) of the negative electrode current collector 20 in the figure. In the battery cell 5, the positive electrode composition layer 11 and the negative electrode composition layer 21 are arranged so as to face each other via the separator 30, and the positive electrode 1, the separator 30, and the negative electrode 2 are stacked in this order.

[0014] The positive electrode collector 10 is rectangular in plan view and is a resin current collector (resin current collector). The positive electrode collector 10 contains a resin and a conductive filler, and may further contain a dispersant for the resin current collector. The surface of the positive electrode collector 10 may be metal-plated. Examples of the resin material include polypropylene (PP). The positive electrode collector 10 has a first surface that faces the negative electrode 2. The surface (first surface) of the positive electrode collector 10 has a covered portion where the positive electrode composition layer 11 is disposed, and a non-covered portion where the positive electrode composition layer 11 is not disposed. This non-covered portion is also the peripheral portion of the surface of the positive electrode collector 10.

[0015] The negative electrode current collector 20 is rectangular in plan view and is a resin current collector (resin current collector). The negative electrode current collector 20 contains a resin and a conductive filler, and may further contain a dispersant for a resin current collector. The surface of the negative electrode current collector 20 may be metal-plated. Examples of the resin material include polypropylene (PP). The negative electrode current collector 20 has a second surface that is the positive electrode 1 side. The surface (second surface) of the negative electrode current collector 20 has a covered portion where the negative electrode composition layer 21 is disposed, and a non-covered portion where the negative electrode composition layer 21 is not disposed. The non-covered portion is also the peripheral portion of the surface of the negative electrode current collector 20. Hereinafter, the positive electrode current collector 10 and the negative electrode current collector 20 are also simply referred to as current collectors.

[0016] The positive electrode composition layer 11 has a rectangular shape in a plan view and contains a positive electrode active material. Examples of the positive electrode active material include a composite oxide of lithium and a transition metal. The positive electrode composition layer 11 can contain a coating resin, a conductive assistant such as metal or carbon, an electrolyte solution containing an electrolyte salt, and the like, in addition to the positive electrode active material. The positive electrode active material may be coated with a coating material containing a coating resin and a conductive assistant. The positive electrode composition layer 11 may or may not contain a conductive fiber such as a carbon fiber.

[0017] The negative electrode composition layer 21 is rectangular in plan view and contains a negative electrode active material. Examples of the negative electrode active material include hard carbon. The negative electrode composition layer 21 can contain a coating resin, a conductive assistant such as metal or carbon, an electrolyte solution containing an electrolyte salt, and the like, in addition to the negative electrode active material. The negative electrode active material may be coated with a coating material containing a coating resin and a conductive assistant. The negative electrode composition layer 21 may or may not contain conductive fibers such as carbon fibers. Hereinafter, the positive electrode composition layer 11 and the negative electrode composition layer 21 are also simply referred to as electrode composition layers.

[0018] The separator 30 has a rectangular shape in a plan view, and may be, for example, a porous sheet made of polymer or fiber that absorbs and retains an electrolytic solution or a gel polymer electrolyte, etc. A nonwoven fabric separator may also be used.

[0019] The frame 40 is a quadrangular ring in plan view, and is provided between the non-covered portion (peripheral portion) of the surface of the positive electrode current collector 10 and the non-covered portion (peripheral portion) of the surface of the negative electrode current collector 20. The frame 40 is arranged so that two frame bodies 40 overlap each other in a cross-sectional view, and the upper frame body 40 is arranged so as to cover the side portion of the positive electrode composition layer 11, and the lower frame body 40 is arranged so as to cover the side portion of the negative electrode composition layer 21. The frame body 40 has a third surface on at least one side of the surface (first surface) of the positive electrode current collector 10 and the surface (second surface) of the negative electrode current collector 20. The frame body 40 may be made of any material that is durable against the electrolyte, and is preferably a thermosetting polymer material. An example of the thermosetting polymer material is an epoxy resin that is highly durable and easy to handle. In addition, in a plan view, the four corners of the frame 40 are defined as corners, the outer peripheral edge sides of the corners are defined as corners, and the inner peripheral edge sides of the corners are defined as corners.

[0020] The materials of the components constituting the battery cell 5 are not limited to the above-mentioned materials, and various materials can be used.

[0021] <Frame> Next, an example of the frame 40 of the battery cell 5 of this embodiment will be described with reference to FIGS.

[0022] FIG. 2 is a perspective view showing a secondary battery cell. For convenience of explanation, a part of the positive electrode current collector 10 is shown rolled up, and a corner of the frame body 40 (a part surrounded by a circle in the figure) is shown enlarged. Here, the groove 41 is arranged at the corner of the frame body 40 in a plan view, and is meandering. The groove 41 is formed from corner to corner of the frame body 40, one end of the groove 41 is arranged at the corner of the frame body 40, and the other end of the groove 41 is arranged at the corner of the frame body 40. The groove 41 is meandering in a manner such that U-shapes rotated 90 degrees around an axis in a counterclockwise or clockwise direction are alternately arranged to form a continuous U-shape. The groove 41 may be labyrinth-shaped. The groove 41 is formed to a predetermined depth and a predetermined width from the upper surface (third surface) of the frame body 40. The cross-sectional shape of the groove 41 is, for example, approximately V-shaped.

[0023] The frame body 40 is a rectangular ring-shaped member, and as shown in FIG. 1, is configured by combining two frame body members (hereinafter, also simply referred to as frame body members) that are L-shaped in plan view. The two frame body members 40a (see FIG. 3) that configure the frame body 40 have the same shape and structure. The frame body member 40a has an uneven shape at both ends of the frame body member 40a in plan view. In the frame body 40, the uneven shape of one frame body member 40a and the uneven shape of the other frame body member 40a are fitted together. By fitting the uneven shapes of the frame body members 40a together in this way, the meandering groove 41 is formed.

[0024] 3 is a perspective view showing a typical process for manufacturing a frame member. The frame member 40a is manufactured by a process of continuously cutting out the shape of the frame member 40a from a belt-shaped flat plate substrate 45 having a predetermined thickness from the top to the bottom in the figure (punching process). This punching process forms an R (radius) portion 42 on the outer periphery of the top surface (third surface) of the frame 40, which is the portion where the blade enters from the top in the figure. The R portion 42 is a convex curved portion having an R shape in a cross-sectional view, and has a curved surface 42a (see FIG. 4).

[0025] FIG. 4 is a cross-sectional schematic diagram showing a flow path (space). The frame 40 is disposed on the upper surface 20a (second surface) of the negative electrode current collector 20 in the figure, and the two frame members 40a constituting the frame 40 are assembled (fitted). Each of the two frame members 40a has a rounded portion 42 on the outer periphery of the lower surface (third surface) in the figure. When the two frame members 40a are assembled, a groove 41 having a depth direction in the direction of the arrow in the figure is formed by the rounded portions 42 of the assembled two frame members 40a. When the groove 41 is disposed on the upper surface 20a side of the negative electrode current collector 20 in the figure, a flow path 43 is formed that is divided by each surface of the upper surface 20a of the negative electrode current collector 20 in the figure and the curved surface 42a of the rounded portion 42. As described above, the groove 41 is meandering, and therefore the flow path 43 is also meandering. Furthermore, since this is the same as the embodiment described above, illustrations and descriptions are omitted, but there is a flow path that is separated by each surface (first surface) of the positive electrode collector 10 and the curved surfaces 42a of the R portions 42 of the two combined frame members 40a.

[0026] Therefore, gas generated inside the battery cell 5 can be released from the flow path 43 of the battery cell 5 of this embodiment. The flow path 43 is a gas release groove as a gas release mechanism. Two gas release grooves are present per frame 40, and four gas release grooves are present on the positive electrode 1 side and the negative electrode 2 side in the two overlapping frame bodies 40. The frame body 40 is disposed on the side of the positive electrode composition layer 11 and the negative electrode composition layer 21 so as to cover the side portions of these composition layers, and a flow path 43 is formed at the corner of the frame body 40, but the flow path 43 is meandering, making it difficult for the electrolyte to leak from these composition layers.

[0027] If the rectangular ring-shaped frame 40 is manufactured from the flat plate base material 45 by punching, the remaining part of the rectangular ring (i.e., the central part of the rectangular ring) is unnecessary, and waste occurs in the manufacturing process. If the frame 40 is manufactured by injection molding, the thickness will be relatively thin, the molding method will be difficult, and there will be many unnecessary parts such as runners, resulting in a long tact time (pitch time). In contrast, if the L-shaped frame member 40a is manufactured from the flat plate base material 45 by punching, as in this embodiment, it is possible to fill the gaps between each of the frame members 40a because of their L-shape, and waste can be reduced. In addition, the manufacturing (molding) method of the frame member 40a is easy, and the tact time (pitch time) is also short. In addition, the thickness of the frame member 40a is the same as the thickness of the flat plate base material 45, so it is easy to adjust it by simply adjusting the thickness of the flat plate base material 45.

[0028] <Other Examples> In addition, when the frame member 40a is manufactured by punching, the frame member 40a is hollowed out from the upper surface toward the lower surface in Fig. 3, but the frame member 40a may be hollowed out from the lower surface toward the upper surface in Fig. 3. As long as the grooves 41 are disposed on the upper surface (front surface) of the positive electrode current collector 10 and the upper surface (front surface) of the negative electrode current collector 20, the hollowing out direction during punching may be from either side.

[0029] Further, the frame 40 is provided on each of the positive electrode 1 side and the negative electrode 2 side, and the grooves 41 are arranged at the corners of the frame 40. The corners where the grooves 41 are arranged may be arranged at the same positions on the positive electrode 1 side and the negative electrode 2 side. More preferably, as shown in FIG. 1, the corners where the grooves 41 are arranged should be arranged at alternate positions on the positive electrode 1 side and the negative electrode 2 side.

[0030] In addition, the frame body 40 is configured from two L-shaped frame body members 40a, but may have other configurations. The frame body 40 may be configured from, for example, two U-shaped frame body members, or from four trapezoidal frame body members. For example, the four trapezoidal frame body members are configured by combining two frame body members (long side frame body members) that are the long side portions of the frame body 40 and two frame body members (short side frame body members) that are the short side portions of the frame body 40. Each frame body member has an uneven shape at both ends in a plan view. In the frame body 40, the uneven shape of the long side frame body member and the uneven shape of the short side frame body member are fitted together. In this way, the uneven shapes of the frame body members are fitted together to form the meandering groove 41. In this case, the groove 41 is arranged at all corners of the frame body 40. There are four flow paths 43 per frame 40, and eight flow paths 43 are present between the positive electrode 1 side and the negative electrode 2 side in the two overlapping frame bodies 40. Therefore, the gas release mechanism can achieve higher gas release efficiency. The frame body 40 may be configured by combining a plurality of members, and may be configured from frame members of different shapes and different numbers.

[0031] Although the frame member 40a has been described as having a concave shape at both ends in a plan view, it may have a concave shape at one end and a convex shape at the other end. The frame member 40a may have a convex shape at one end and a concave shape at the other end. In a configuration in which both ends of the frame member 40a have one concave or one convex, it may include at least one concave having a U-shape in a plan view, or at least one convex having an inverted U-shape in a plan view. In a similar configuration, it may include at least one convex having a U-shape in a plan view, or at least one concave having an inverted U-shape in a plan view.

[0032] Furthermore, the frame 40 may have a groove having an uneven shape in a plan view different from the groove 41, which is formed by press working or the like at a position different from the groove 41 on the upper surface of the frame 40 (surface of the frame member 40a). The groove having an uneven shape different from the groove 41 may be configured to release gas from the groove when it is disposed on the surface (first surface) of the positive electrode current collector 10 and / or the surface (second surface) of the negative electrode current collector 20.

[0033] Furthermore, the groove 41 may have a different shape as long as the electrolyte and the like are unlikely to leak out. For example, the groove 41 may be formed from corner to corner of the frame 40 in a plan view, and may have a serpentine shape formed by zigzag folding back in a continuous series of alternating V-shapes.

[0034] Although the groove 41 is formed with a predetermined depth and a predetermined width from the upper surface (third surface) of the frame body 40, other configurations are possible as long as the electrolyte and the like are unlikely to leak out. For example, the groove 41 may be provided deeper in the depth direction, or may be provided so as to be wider in the width direction. Also, there may be gaps scattered between the two frame body members 40a, or the two frame body members 40a may not be in contact with each other.

[0035] Although the groove 41 is configured to be meandering to prevent leakage of the electrolyte, the groove 41 may be further configured to prevent leakage. The groove 41 may have, for example, a liquid-repellent (water-repellent) coating layer on its surface. By applying a coating agent to the surface of the groove 41 to make it liquid-repellent, the coating layer (film) formed on the surface of the groove 41 exhibits liquid-repellency. This repels the electrolyte, making it more difficult to leak and facilitating the release of only gas. Examples of the coating agent include fluorine-based agents such as [product name "Fluorosurf (registered trademark)" manufactured by Fluoro Technology Co., Ltd.] and [product name "Surflon (registered trademark)" manufactured by AGC Seimi Chemical Co., Ltd.]. Examples of the coating agent include [product name "JC Coat (registered trademark)" manufactured by Taiyo Yuden Chemical Technology Co., Ltd.]. Note that the liquid-repellent (water-repellent) properties may be imparted to the groove 41 by a configuration other than the liquid-repellent coating layer. When the grooves 41 are provided with liquid repellency (water repellency), the grooves 41 may or may not be meandering.

[0036] The frame 40 may be formed by combining a plurality of members, and may be formed from frame members of different shapes. For example, the frame 40 may be formed by combining a frame member (large frame member) having a shape in which a portion of a rectangular ring is cut out, and a frame member (small frame member) corresponding to the cut out portion. The large frame member may be formed from a thermosetting polymer material, as with the frame member described above. On the other hand, the small frame member may be a porous (mesh-like) film made of polymer or fiber. When the frame 40 is formed by combining the large frame member and the small frame member, the small frame member serves to release gas generated inside the battery cell 5. The small frame member may be provided with a liquid-repellent (water-repellent) coating layer having a property of repelling liquid. Although it is preferable to provide the meandering flow path 43, it is not necessary to provide it.

[0037] Also, while it has been described that the frame 40 is provided with the flow path 43, that is, the gas release groove as a gas release mechanism, a structure may be adopted in which gas is released in a portion of the battery cell 5 other than the frame 40. The portion of the battery cell 5 other than the frame 40 is, for example, an end portion (peripheral portion) of the surface of the positive electrode current collector 10 and / or the surface of the negative electrode current collector 20 capable of releasing gas, in a direction perpendicular to the thickness direction of the current collectors.

[0038] FIG. 5 is a schematic cross-sectional view of a secondary battery in which a plurality of battery cells 5 are stacked. First, the positive electrode collector 10 and / or the negative electrode collector 20 of the battery cell 5 are resin collectors formed containing resin and capable of permeating gas generated in the battery cell 5. Resin has countless minute voids at the molecular level, and is actually permeable to gas, and can release (permeate) gas from the resin collector. On the other hand, in a secondary battery, it is assumed that smooth gas release is difficult at the upper and lower surface parts not adjacent to the space inside the exterior material among the surfaces of the positive electrode collector 10 and / or the negative electrode collector 20 that can release gas in each battery cell 5. Therefore, the end (periphery) of the surface of the collector in the direction perpendicular to the thickness direction of the collector is made adjacent to the space inside the exterior material.

[0039] Specifically, the thickness of each battery cell 5 is set so that the peripheral portion is tapered. As shown in FIG. 5, the thickness of the frame member 40a is thinner than the total thickness of the positive electrode collector 10, the separator 30, and the negative electrode collector 20 in the stacking direction. The peripheral portions of the positive electrode collector 10 and the negative electrode collector 20 have slopes that are inclined surfaces. The slopes are formed based on the difference between the total thickness of the positive electrode 1, the separator 30, and the negative electrode 2 and the total thickness of the positive electrode collector 10, the frame 40, and the negative electrode collector 20. More specifically, the peripheral portion of the positive electrode collector 10 has an inclined surface that is inclined so that the thickness of the positive electrode 1 becomes thinner from the center of the positive electrode 1 toward the peripheral portion, and the peripheral portion of the negative electrode collector 20 has an inclined surface that is inclined so that the thickness of the negative electrode 2 becomes thinner from the center of the negative electrode 2 toward the peripheral portion. The sloped surface is adjacent to the space inside the exterior material, and therefore gas can be released (permeated) more easily than other parts of the surface of the current collector. In addition, the peripheral portion of the surface of the current collector is narrower than other parts of the surface of the current collector, but is provided along the entire periphery (four sides) of the battery cell 5. Therefore, the sloped surface has a sufficiently large area as a gas release site, and gas can be released (permeated) smoothly and quickly. By adopting a structure that allows gas to be released from the sloped surface in this way, higher gas release efficiency can be expected.

[0040] The strong electric tab 50 is a generally plate-shaped metal member (e.g., copper) that comes into surface contact with parts of the electrode current collectors of the battery cells 5 located in the bottom and top layers, and is used to extract current from the stacked battery cells 5. The electrode current collectors with which the strong electric tab 50 comes into surface contact are also the electrode current collectors of the outermost layer. The exterior body 60 is a laminate film or laminate sheet made by coating a metal material such as aluminum with an insulating material. It is formed by covering with a laminate film or laminate sheet and sealing under vacuum. The secondary battery 100 is an assembled battery modularized by stacking a plurality of battery cells 5, for example.

[0041] As described above, the secondary battery cell according to the present embodiment has been described. However, it goes without saying that a person skilled in the art can appropriately add to, modify, or omit aspects of the present embodiment within the scope of the technical concept thereof.

[0042] The secondary battery cells have been described as lithium-ion battery cells, but may be other secondary battery cells, such as lead acid battery cells, solid-state battery cells, semi-solid state battery cells, nickel-metal hydride battery cells, etc. [Industrial Applicability]

[0043] By using the secondary battery cell according to this embodiment in, for example, an electric vehicle or a hybrid vehicle, a long driving distance per charge and a long life can be achieved. [Explanation of symbols]

[0044] 1 positive electrode 2 negative electrode 5 Battery Cells 10 Positive electrode current collector 11 Positive electrode composition layer 20 Negative electrode current collector 20a Upper surface of negative electrode current collector 21 Negative electrode composition layer 30 Separator 40 Frame 40a Frame member 41 Groove 42 R section 42a Curved Surface 43 Flow Path 50 High voltage tab 60 Exterior body 100 Secondary battery

Claims

1. a positive electrode including a positive electrode current collector having a first surface and a positive electrode composition layer provided on the first surface such that a peripheral portion of the first surface is exposed; a negative electrode including a negative electrode current collector having a second surface that is the positive electrode side, and a negative electrode composition layer provided on the second surface such that a peripheral portion of the second surface is exposed; a frame provided between a peripheral portion of the first surface and a peripheral portion of the second surface, the frame covering at least a portion of a side surface of the positive electrode composition layer and a side surface of the negative electrode composition layer; Equipped with The frame has a liquid-repellent flow path and / or a meandering flow path extending from its inner peripheral edge to its outer peripheral edge. Secondary battery cell.

2. the frame includes a plurality of assembled frame members, and the frame has a third surface on at least one of the first surface side and the second surface side, the third surface being provided with the flow path; The flow path is formed between the assembled frame members. The secondary battery cell according to claim 1 .

3. The plurality of frame members include a first frame member having a first end and a second end opposite the first end; a second frame member having a third end and a fourth end opposite the third end; Including, The first end and the third end are configured to be interfittable with each other, The second end and the fourth end are configured to be interfittable with each other. The secondary battery cell according to claim 2 .

4. a peripheral portion of the third surface includes an R portion having an R shape in a cross-sectional view, The space between the assembled frame members is the space between the R portions of the assembled frame members. The secondary battery cell according to claim 2 .

5. the positive electrode has a first inclined surface on a peripheral portion of the first surface, the first inclined surface being inclined so that the thickness of the positive electrode becomes thinner in a direction from the center toward the peripheral edge of the positive electrode; the negative electrode has a second inclined surface on a peripheral portion of the second surface, the second inclined surface being inclined so that the thickness of the negative electrode becomes thinner in a direction from the center toward the peripheral edge of the negative electrode; the positive electrode current collector and the negative electrode current collector are resin current collectors that are permeable to gas generated in the cell; The secondary battery cell according to claim 1 .

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