Bipolar battery

Abstract

Provided is a bipolar storage battery capable of increasing energy density while achieving both airtightness and mechanical strength. A bipolar lead storage battery (100) comprises: outer walls (112), (122) that project integrally along a peripheral edge on opposing faces of one of mutually opposing frame plates (111), (121); and joining walls (113), (133) that project integrally on the opposing faces of the other of the frame plates (111), (131), are located further inward than the outer walls (112), 122) of the one of the frame plates (111), (121), and surround a peripheral edge of a cell member (140), wherein the opposing faces of the joining walls (113), (133) and the one of the frame plates (111), (121) are joined by using a joining material (151).

Description

[Technical field]

[0001] The present invention relates to a bipolar storage battery. [Background technology]

[0002] A bipolar storage battery is configured by alternately stacking multiple cell members, each having a positive electrode and a negative electrode each having a metal layer such as lead and an active material layer, with an electrolytic layer containing an electrolyte such as sulfuric acid interposed between them, and resin substrates, and by disposing a resin picture-frame-shaped frame surrounding the cells between the opposing substrates, with the cell members being electrically connected in series (see, for example, Patent Document 1 listed below). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2017-508241 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional bipolar storage battery as described above, the substrate and the frame are joined together to prevent leakage of the electrolyte to the outside, and the battery is housed inside an exterior case to prevent stress from being applied to the joint from the outside, thereby maintaining airtightness and mechanical strength. For this reason, the conventional bipolar storage battery as described above has a large number of components and is bulky, resulting in a decrease in energy density. In view of the above, an object of the present invention is to provide a bipolar storage battery that is capable of increasing the energy density while achieving both airtightness and mechanical strength. [Means for solving the problem]

[0005] In order to solve the above-mentioned problems, the bipolar storage battery of the present invention is a bipolar storage battery in which cell members having an electrolytic layer interposed between a positive electrode and a negative electrode and a resin frame plate that houses the cells are alternately stacked in multiple layers, thereby connecting the cell members in series, and is characterized in that the bipolar storage battery comprises an outer peripheral wall that protrudes integrally along a periphery on the opposing surface of one of the frame plates that face each other, and a joint wall that protrudes integrally on the opposing surface of the other of the frame plates that is located inside the outer peripheral wall of the one of the frame plates and surrounds the periphery of the cell member, and the joint wall of the other of the frame plates and the opposing surface of the one of the frame plates are joined with a bonding material. Effect of the Invention

[0006] According to the bipolar storage battery of the present invention, an outer peripheral wall is provided along the periphery of the frame plate, a joint wall is provided on the inside of the outer peripheral wall, and a joint material is provided between the joint wall and the opposing surface of the frame plate, so that leakage of the electrolyte to the outside can be prevented and stress applied to the joint material from the outside can be prevented, so that airtightness and mechanical strength can be maintained. As a result, there is no need to store the battery inside an exterior case, etc., and the number of parts can be reduced and the battery can be made compact, so that the energy density can be increased while achieving both airtightness and mechanical strength. [Brief description of the drawings]

[0007] [Figure 1] 1 is a cross-sectional view showing a schematic structure of a first embodiment of a bipolar storage battery according to the present invention. [Diagram 2] FIG. 2 is a cross-sectional view showing a schematic structure of a second embodiment of a bipolar storage battery according to the present invention. [Diagram 3] FIG. 4 is a cross-sectional view showing a schematic structure of a third embodiment of a bipolar storage battery according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A bipolar storage battery according to an embodiment of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiment described with reference to the drawings.

[0009] First Embodiment A first embodiment of a bipolar storage battery according to the present invention will be described with reference to FIG. As shown in FIG. 1, inside the bipolar lead-acid battery 100 according to this embodiment, a plurality of substrates 111, which are rectangular flat frame plates made of a thermoplastic resin having resistance to sulfuric acid (for example, polyethylene, polypropylene, polystyrene, polyvinyl chloride, polymethyl methacrylate (acrylic resin), acrylonitrile-butadiene-styrene copolymer (ABS), polyamide (nylon), polycarbonate, etc.), are arranged to face each other at intervals. At one end side (lower end side in FIG. 1) in the arrangement direction of the substrates 111 of the bipolar lead-acid battery 100, a first end plate 121, which is a rectangular flat frame plate made of a thermoplastic resin having resistance to sulfuric acid, is arranged in the same manner as the substrates 111. At the other end side (upper end side in FIG. 1) in the arrangement direction of the substrates 111 of the bipolar lead-acid battery 100, a second end plate 131, which is a rectangular flat frame plate made of a thermoplastic resin having resistance to sulfuric acid, is arranged in the same manner as the substrates 111.

[0010] A positive electrode lead layer 141a made of lead or a lead alloy, which is a metal layer for a positive electrode, is disposed on the other surface (upper surface in FIG. 1) of each of the substrate 111 and the first end plate 121. A positive electrode active material layer 141b containing an active material is disposed on each of the positive electrode lead layers 141a. The positive electrode lead layer 141a and the positive electrode active material layer 141b form a positive electrode 141. A negative electrode lead layer 142a made of lead or a lead alloy, which is a metal layer for a negative electrode, is disposed on one surface (the lower surface in FIG. 1) of each of the substrate 111 and the second end plate 131. A negative electrode active material layer 142b containing an active material is disposed on each of the negative electrode lead layers 142a. The negative electrode lead layer 142a and the negative electrode active material layer 142b form the negative electrode 142.

[0011] Between the positive electrode 141 and the negative electrode 142, an electrolytic layer 143 such as a glass fiber mat impregnated with an electrolytic solution such as sulfuric acid is disposed. The positive electrode 141, the negative electrode 142, and the electrolytic layer 143 form a cell member 140. These cell members 140 are electrically connected in series by a known means. For example, the substrate 111 is provided with a means for electrically connecting the positive electrode lead layer 141a and the negative electrode lead layer 142a. In FIG. 1, 101 denotes a positive electrode terminal, and 102 denotes a negative electrode terminal. In other words, cell members 140 each having an electrolytic layer 143 interposed between a positive electrode 141 and a negative electrode 142 and resin frame plates 111, 121, and 131 that house the cell members 140 are alternately stacked in multiple layers, so that the cell members 140 are connected in series.

[0012] Peripheral walls 112 made of a sulfuric acid-resistant thermoplastic resin and having a rectangular frame shape (picture frame shape) are integrally provided on the other surface (upper surface in FIG. 1) of substrate 111 to protrude along the periphery. Joining walls 113 made of a sulfuric acid-resistant thermoplastic resin and having a protrusion are integrally provided on one surface (lower surface in FIG. 1) of substrate 111 to be located on the inside of peripheral walls 112 on the other surface (upper surface in FIG. 1) of substrate 111 and to surround the periphery of cell member 140.

[0013] A rectangular frame-shaped (picture frame-shaped) outer peripheral wall 122 made of a sulfuric acid-resistant thermoplastic resin is integrally provided on the other surface (upper surface in FIG. 1) of the first end plate 121. A sulfuric acid-resistant joint wall 133 made of a sulfuric acid-resistant thermoplastic resin is integrally provided on one surface (lower surface in FIG. 1) of the second end plate 131, the joint wall 133 being located more inward on the substrate 111 than the outer peripheral wall 112 on the other surface (upper surface in FIG. 1) of the opposing substrate 111 and surrounding the peripheral edge of the cell member 140.

[0014] In other words, it is provided with outer peripheral walls 112, 122 that protrude integrally along the periphery from the opposing surface (top surface in Figure 1) of one of the opposing frame plates 111, 121 (lower in Figure 1), and joining walls 113, 133 that protrude integrally from the opposing surface (bottom surface in Figure 1) of the other opposing frame plates 111, 131 (upper in Figure 1), are positioned more inward than the outer peripheral walls 112, 122 of the one of the opposing frame plates 111, 121 (lower in Figure 1), and surround the periphery of the cell member 140.

[0015] An end (lower end in FIG. 1) of the joint wall 133 of the second end plate 131 is joined to the other surface (upper surface in FIG. 1) of the opposing substrate 111 via a sulfuric acid-resistant adhesive (e.g., an epoxy resin adhesive) 151, which is a bonding material. An end (lower end in FIG. 1) of the joint wall 113 of the opposing substrate 111 is joined to the other surface (upper surface in FIG. 1) of the first end plate 121 via the adhesive 151. An end (lower end in FIG. 1) of the joint wall 113 of the other substrate 111 (upper surface in FIG. 1) facing each other is joined to the other surface (upper surface in FIG. 1) of one substrate 111 (lower surface in FIG. 1) via the adhesive 151. In other words, the joining walls 113, 133 of the other (upper in Figure 1) frame plates 111, 131 and the opposing surfaces (upper surfaces in Figure 1) of the one (lower in Figure 1) frame plates 111, 121 are joined with an adhesive (joint) 151.

[0016] Gaps are formed between the outer peripheral wall 122 of the first end plate 121 and one surface (lower surface in FIG. 1) of the opposing substrate 111, and between the outer peripheral wall 122 and the joining wall 113. Gaps are formed between one surface (lower surface in FIG. 1) of the second end plate 131 and the outer peripheral wall 112 of the opposing substrate 111, and between the outer peripheral wall 112 and the joining wall 133 of the second end plate 131. Gaps are formed between the outer peripheral wall 112 of one (lower surface in FIG. 1) substrate 111 facing each other and one surface (lower surface in FIG. 1) of the other (upper surface in FIG. 1) substrate 111, and between the outer peripheral wall 112 and the joining wall 113.

[0017] In other words, a gap is formed between the outer peripheral walls 112, 122 of one (lower in Figure 1) frame plates 111, 121 and the opposing surface (lower surface in Figure 1) of the other (upper in Figure 1) frame plates 111, 131, and a gap is formed between the outer peripheral walls 112, 122 of one (lower in Figure 1) frame plates 111, 121 and the joining walls 113, 133 of the other (upper in Figure 1) frame plates 111, 131. In this embodiment, each space partitioned and surrounded by the opposing frame plates 111, 121, 131, the joining walls 113, 133, and the adhesive 151 serves as a cell C, and houses each cell member 140 therein.

[0018] In the bipolar lead-acid battery 100 according to this embodiment, the joint walls 113, 133 are joined to the opposing surfaces (other surfaces) of the opposing substrate 111 and the first end plate 121 via an adhesive 151. This makes it possible to prevent the electrolyte impregnated in the electrolytic layer 143 from leaking to the outside. In addition, since the outer peripheral wall 112 is provided protruding along the periphery of the opposing surfaces (other surfaces) of the substrate 111 and the first end plate 121, it is possible to prevent stress from being applied to the adhesive 151 from the outside, and therefore it is possible to maintain airtightness and mechanical strength.

[0019] Therefore, the bipolar lead-acid battery 100 according to this embodiment does not need to be housed inside an exterior case or the like, making it possible to reduce the number of components and achieve a more compact size. Therefore, the bipolar lead-acid battery 100 according to this embodiment can increase the energy density while achieving both airtightness and mechanical strength.

[0020] That is, in the bipolar lead-acid battery 100, the outer peripheral walls 112, 122 are provided along the periphery of the frame plates 111, 121, and the joint walls 113, 133 are provided on the inner side of the outer peripheral walls 112, 122, and the joint walls 113, 133 and the opposing surfaces of the frame plates 111, 121 are joined by a joint material (adhesive) 151. This can prevent the electrolyte from leaking to the outside and can prevent stress from being applied to the joint material 151 from the outside, so that airtightness and mechanical strength can be maintained. As a result, there is no need to store the battery inside an exterior case, etc., and the number of parts can be reduced and the battery can be made compact, so that the energy density can be increased while achieving both airtightness and mechanical strength.

[0021] Furthermore, gaps are formed between the outer peripheral walls 112, 122 and the opposing surfaces (one side) of the opposing substrate 111 and second end plate 131, and gaps are formed between the outer peripheral walls 112, 122 and the joining walls 113, 133. This makes the outer peripheral walls 112, 122 more flexible, which can buffer external stress and further reduce external stress applied to the adhesive 151 portion.

[0022] Second Embodiment A bipolar storage battery according to a second embodiment of the present invention will be described with reference to Fig. 2. However, for parts similar to those in the above-described embodiment, the same reference numerals as those used in the description of the above-described embodiment are used, and descriptions that overlap with those in the above-described embodiment will be omitted. As shown in FIG. 2, on the other side (upper side in FIG. 2) of the substrate 111 of the bipolar lead-acid battery 200 according to this embodiment, there is provided an inner peripheral wall 214 made of a thermoplastic resin having sulfuric acid resistance, which is located inside the substrate 111 relative to the joint wall 113 on one side (lower side in FIG. 2) of the substrate 111 and surrounds the periphery of the cell 140.

[0023] An inner peripheral wall 224 made of a sulfuric acid-resistant thermoplastic resin is integrally provided on the other side (upper side in Figure 2) of the first end plate 121, which is located more inward than the outer peripheral wall 112 on one side (lower side in Figure 2) of the opposing substrate 111 and surrounds the periphery of the cell member 140. In other words, the inner walls 214, 224 are integrally protruded from the opposing surface (upper surface in FIG. 2) of one of the frame plates 111, 121 (lower in FIG. 2), are positioned more inward than the joining walls 113, 133 of the other frame plate 111, 131 (upper in FIG. 2), and surround the periphery of the cell member 140.

[0024] The tip side (lower end side in Figure 2) of the joining walls 113, 133 is joined between the opposing surfaces (other surfaces) of the opposing substrate 111 and first end plate 121, between the outer peripheral walls 112, 122, and between the inner peripheral walls 214, 224 by a fusion material 252, which is a bonding material made of the same thermoplastic resin material as the substrate 111, the first end plate 121, and the joining walls 113, 133.

[0025] That is, the joining walls 113, 133 of the other (upper in FIG. 2) frame plates 111, 131 and the opposing surfaces (upper surfaces in FIG. 2) of the one (lower in FIG. 2) frame plates 111, 121 are joined by a fusion material (joining material) 252. Also, the joining walls 113, 133 are joined between the tip ends (lower ends in FIG. 2) and the outer circumferential walls 112, 122, and between the tip ends (lower ends in FIG. 2) and the inner circumferential walls 214, 224 by the fusion material (joining material) 252. In this embodiment, each space partitioned by the opposing frame plates 111, 121, 131, the joining walls 113, 133, the inner circumferential walls 214, 224, and the fusion material 252 forms a cell C, which surrounds each cell member 140.

[0026] In the bipolar lead-acid battery 200 according to this embodiment, the tip side (lower end side in FIG. 2) of the joint walls 113, 133 is inserted and pressed between the outer peripheral walls 112, 122 and the inner peripheral walls 214, 224, and is vibrated against the other side (upper side in FIG. 2) of the substrate 111 or the first end plate 121 to generate frictional heat (vibration friction). As a result, the tip side of the joint walls 113, 133 and the other side portions of the substrate 111 or the first end plate 121 between the outer peripheral walls 112, 122 and the inner peripheral walls 214, 224 melt. Then it solidifies. This becomes the fusion material 252 .

[0027] That is, the fusion material 252 is fused to the frame plate 111 or 131 on the other side (upper side in FIG. 2) by vibration friction between the joining walls 113 or 133 and the opposing surfaces (upper surfaces in FIG. 2) of the frame plates 111 or 121 on the other side (lower side in FIG. 2). A solid formed by melting and then solidifying That is it. The fusion material 252 fuses the tip sides of the joining walls 113, 133 to the other side portions of the substrate 111 and the first end plate 121, and also penetrates between the tip sides of the joining walls 113, 133 and the outer peripheral walls 112, 122 and the inner peripheral walls 214, 224 to join them (vibration welding).

[0028] In the bipolar lead-acid battery 200 of this embodiment using such vibration welding, not only are the tips of the joining walls 113, 133 joined to the opposing surfaces (other surfaces) of the substrate 111 and the first end plate 121, but also the tips of the joining walls 113, 133 joined to the inner walls 214, 224 and the outer walls 112, 122. This makes it possible to increase the joining range of the joining walls 113, 133 and further increase the joining strength. Therefore, according to the bipolar lead-acid battery 200 of this embodiment, it is possible to obtain the same effects as those of the first embodiment described above, and further, it is possible to more reliably prevent the electrolyte impregnated in the electrolytic layer 143 from leaking to the outside while absorbing external stress.

[0029] Third embodiment A bipolar storage battery according to a third embodiment of the present invention will be described with reference to Fig. 3. However, for parts similar to those in the above-described embodiment, the same reference numerals as those used in the description of the above-described embodiment are used, and descriptions that overlap with those in the above-described embodiment will be omitted. As shown in Fig. 3, an outer peripheral wall 312 made of a thermoplastic resin having resistance to sulfuric acid and having a rectangular frame shape (frame-shaped) along the periphery is integrally provided on the other surface (upper surface in Fig. 3) of the substrate 111 of the bipolar lead-acid battery 300 according to this embodiment and protrudes along the periphery. An outer peripheral wall 322 made of a thermoplastic resin having resistance to sulfuric acid and having a rectangular frame shape (frame-shaped) along the periphery is integrally provided on the other surface (upper surface in Fig. 3) of the first end plate 121 and protrudes along the periphery.

[0030] The bonding between the tips (lower end in Figure 3) of the joining walls 113, 133 and the other side (upper side in Figure 3) of the substrate 111 and the first end plate 121, between the inner surface of the outer peripheral wall 312, 322 and the outer surface of the joining walls 113, 133, between the outer surface of the inner peripheral wall 214, 224 and the inner surface of the joining walls 113, 133, and between the tips (upper end in Figure 3) of the outer peripheral wall 312, 322 and one side (lower side in Figure 3) of the substrate 111 and the second end plate 131 is done with a fusion material 352, which is a bonding material made of thermoplastic resin, the same material as the substrate 111, the first end plate 121, the second end plate 131, the joining walls 113, 133, and the outer peripheral wall 312, 322.

[0031] That is, between the joint walls 113, 133 of the other (upper in FIG. 3) frame plates 111, 131 and the opposing surfaces (upper surfaces in FIG. 3) of the one (lower in FIG. 3) frame plates 111, 121, between the outer peripheral walls 312, 322 of the one (lower in FIG. 3) frame plates 111, 121 and the joint walls 113, 133 of the other (upper in FIG. 3) frame plates 111, 131, The inner walls 214, 224 of the frame plates 111, 121 on one side (lower in Figure 3) and the joining walls 113, 133 of the frame plates 111, 131 on the other side (upper in Figure 3), and the outer walls 312, 322 of the frame plates 111, 121 on one side (lower in Figure 3) and the opposing surface (lower surface in Figure 3) of the frame plates 111, 131 on the other side (upper in Figure 3) are joined by fusion material 352.

[0032] In this embodiment, each space partitioned by the opposing frame plates 111, 121, 131, the joining walls 113, 133, the inner circumferential walls 214, 224, and the fusion material 352 forms a cell C which surrounds each cell member 140. In the bipolar lead-acid battery 300 according to this embodiment, when the tip side (lower end side in FIG. 3) of the joint wall 113, 133 is inserted between the outer peripheral wall 312, 322 and the inner peripheral wall 214, 224 and pressed, the tip (upper end in FIG. 3) of the outer peripheral wall 312, 322 is pressed against one side (lower surface in FIG. 3) of the substrate 111 or the second end plate 131.

[0033] When the substrate 111 or the second end plate 131 is vibrated relative to the opposing substrate 111 or the first end plate 121, frictional heat (vibration friction) is generated between the tips of the joining walls 113, 133 and the opposing surfaces (other surfaces) of the substrate 111 or the first end plate 121, and between the tips of the outer peripheral walls 312, 322 and the opposing surfaces (one surfaces) of the substrate 111 or the second end plate 131.

[0034] As a result, the ends (lower ends in FIG. 3) of the joining walls 113 and 133 and the other surface portions (upper surfaces in FIG. 3) of the substrate 111 and the first end plate 121 opposed to the ends are melted. Then, it solidifies and becomes the fusion material 252. At the same time, the ends (upper ends in FIG. 3) of the outer peripheral walls 312 and 322 and one surface portion (lower surface portion in FIG. 3) of the substrate 111 and the second end plate 131 opposed to the ends melt. Then it solidifies. This becomes the fusion material 352 .

[0035] That is, the fusion material 352 is fused to the frame plate 111 on the other side (upper side in FIG. 3) by vibration friction between the joining walls 113, 133 of the frame plate 111 on the other side (upper side in FIG. 3) and the opposing surface (upper surface in FIG. 3) of the frame plate 111 on the other side (lower side in FIG. 3) and between the outer peripheral walls 312, 322 of the frame plate 111 on the other side (lower side in FIG. 3) and the opposing surface (lower surface in FIG. 3) of the frame plate 111 on the other side (upper side in FIG. 3). A solid formed by melting and then solidifying That is it.

[0036] The fusion material 352 fuses between the tips of the joining walls 113, 133 and the opposing surface portions (other surface portions) of the substrate 111 and the first end plate 121, and between the tips of the outer peripheral walls 312, 322 and the opposing surface portions (one surface portions) of the substrate 111 and the second end plate 131, and also penetrates between the joining walls 113, 133 and the outer peripheral walls 312, 322 and the inner peripheral walls 214, 224 to join them (vibration welding).

[0037] In the bipolar lead-acid battery 300 of this embodiment using such vibration welding, not only are the tip sides of the joining walls 113, 133 joined by vibration welding, but the tips of the outer peripheral walls 312, 322 are also vibration welded to join the tips of the outer peripheral walls 312, 322 as well as the entire length between the outer peripheral walls 312, 322 and the joining walls 113, 133.

[0038] Therefore, in the bipolar lead-acid battery 300 according to this embodiment, the joint range (area) of the joint walls 113, 133 can be further increased compared to the bipolar lead-acid battery 200 according to the second embodiment described above. Therefore, although the bipolar lead-acid battery 300 according to this embodiment leads to a decrease in the buffering capacity of the outer peripheral walls 112, 122 against external stress, the bonding strength of the bonding walls 113, 133 can be further increased compared to the bipolar lead-acid battery 200 according to the second embodiment described above.

[0039] Other Embodiments The bipolar storage battery according to the present invention is not limited to the bipolar lead-acid batteries 100, 200, and 300 according to the above-described embodiments. As another embodiment, for example, the fusion material 252, 352 of the bipolar lead-acid batteries 200, 300 according to the second and third embodiments can be fused by generating a fusion material by other welding processes such as thermal welding using a hot plate or infrared heating, or solvent dissolution, instead of vibration welding.

[0040] It is also possible to make a bipolar storage battery by replacing the adhesive 151 of the bipolar lead-acid battery 100 according to the first embodiment with the fusion material 252, 352 of the bipolar lead-acid battery 200, 300 according to the second and third embodiments. It is also possible to make a bipolar storage battery by replacing the fusion material 252, 352 of the bipolar lead-acid battery 200, 300 according to the second and third embodiments with the adhesive 151 of the bipolar lead-acid battery 100 according to the first embodiment.

[0041] In other words, it is possible to configure a bipolar lead-acid battery by appropriately modifying or replacing various technical aspects of the bipolar lead-acid batteries 100, 200, 300 according to the above-described embodiments as necessary. The electrical conduction means provided in the substrate 111 is not limited to a specific method. For example, it is possible to electrically connect both sides of the substrate by including conductive particles or conductive fibers throughout the substrate. It is also possible to incorporate a conductive member that enables electrical conduction into the substrate. [Industrial Applicability]

[0042] The bipolar storage battery according to the present invention is capable of increasing the energy density while simultaneously achieving both airtightness and mechanical strength, and therefore can be used industrially in an extremely beneficial manner. [Explanation of symbols]

[0043] 100 Bipolar lead-acid battery 101 Positive terminal 102 Negative terminal 111 Substrate 112 Outer wall 113 Joint wall 121 First end plate 122 Outer wall 131 Second End Plate 133 Joint wall 140 Cell member 141 Positive electrode 141a Lead layer for positive electrode 141b Active material layer for positive electrode 142 Negative electrode 142a Lead layer for negative electrode 142b Active material layer for negative electrode 143 Electrolytic layer 151 Adhesive 200 Bipolar lead-acid battery 214 Inner wall 224 Inner wall 252 Fusion material 300 Bipolar lead-acid battery 312 Outer wall 322 Outer wall 352 Fusion material C Cell

Claims

1. A bipolar storage battery comprising: a cell member having a positive electrode and a negative electrode with an electrolytic layer interposed therebetween; and a resin frame plate accommodating the cell member, the cell members being alternately stacked in a plurality of layers, the cell members being connected in series to each other; an outer peripheral wall integrally provided along a periphery on an opposing surface of one of the frame plates; a joint wall that is integrally provided on an opposing surface of the other of the frame plates and that is located inside the outer peripheral wall of the one of the frame plates and surrounds a periphery of the cell member; Equipped with The joint wall of the other frame plate and the opposing surface of the one frame plate are joined together with a joint material. A bipolar storage battery characterized by:

2. The joining material is interposed between the outer peripheral wall of the one frame plate and the joining wall of the other frame plate.

2. The bipolar storage battery according to claim 1 .

3. an inner peripheral wall that is integrally provided on the opposing surface of the one of the frame plates and is positioned inside the joining wall of the other of the frame plates and surrounds a peripheral edge of the cell member; The inner peripheral wall of the one frame plate and the joint wall of the other frame plate are joined together by the joint material.

3. The bipolar storage battery according to claim 1 or 2.

4. A gap is formed between the outer peripheral wall of the one frame plate and the opposing surface of the other frame plate.

4. The bipolar storage battery according to claim 1, wherein the first and second electrodes are electrically connected to each other.

5. The bonding material is an adhesive or a fusion material.

5. The bipolar storage battery according to claim 1 .

6. 6. The bipolar storage battery according to claim 5, wherein the fusion material is a solid material produced by a welding process between the joining wall of the other frame plate and the opposing surface of the one frame plate.

7. The outer peripheral wall of the one frame plate and the opposing surface of the other frame plate are joined together by the joining material.

4. The bipolar storage battery according to claim 1, wherein the first and second electrodes are electrically connected to each other.

8. The bonding material is an adhesive or a fusion material.

8. The bipolar storage battery according to claim 7.

9. The fusion material is a molten material produced by a welding process between the joining wall of the other frame plate and the opposing surface of the one frame plate, and between the outer peripheral wall of the one frame plate and the opposing surface of the other frame plate.

9. The bipolar storage battery according to claim 8.

10. 10. The bipolar storage battery according to claim 1, wherein the resin is a thermoplastic resin.

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