JP2017228374A - Battery cell, battery, and manufacturing method of battery cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery cell which suppresses a reduction in adhesiveness between an electrode and a collector so as to reduce an increase in contact resistance, thereby preventing degradation in functionality, and also to provide a battery and a manufacturing method of the battery cell.SOLUTION: A battery cell 100 comprises: a sheet-like outer packaging bag 101; a first through-hole 10a penetrating the outer packaging bag 101; a tabular first collector 11 which is arranged on the inner face of the outer packaging bag 101 so as to cover, with one flat surface, the first through-hole 10a; a tabular first electrode 13 arranged on another flat surface of the first collector 11; and a first sealant 12 which is provided along the circumference of the first collector 11 so as to fix the first collector 11 to the inner face of the outer packaging bag 101.SELECTED DRAWING: Figure 2

Description

  The present technology relates to a battery cell including an electrode and a current collector, a battery including the battery cell, and a method for manufacturing the battery cell.

  Batteries are widely used in home appliances, electric vehicles, hybrid vehicles, solar power generation facilities, and the like. Examples of the battery include a vanadium redox secondary battery (see, for example, Patent Document 1) or a lithium ion secondary battery.

  A vanadium redox secondary battery is configured by housing one or a plurality of battery cells in a case. The battery cell includes a sheet-shaped outer bag and a flat plate current collector disposed on the inner surface of the outer bag. One plane of the current collector faces the inner surface of the exterior bag, and a first electrode is provided on the other plane of the current collector.

  The current collector is a fixed portion provided along the periphery of the current collector, specifically, a frame-shaped fixed portion fixed to the side surface of the current collector and the inner surface of the outer bag, or the current collector The outer peripheral bag is fixed to the inner surface of the outer bag by a frame-shaped fixing portion or the like fixed to the peripheral edge of the flat surface and the inner surface of the outer bag.

  The battery cell further includes a second electrode facing the first electrode. The first electrode and the second electrode include an active material containing vanadium ions or vanadium-containing ions, a carbon material as a conductive auxiliary agent, a binder, and an electrolytic solution. A vanadium redox secondary battery performs charging / discharging using an oxidation-reduction reaction between the first electrode and the second electrode by setting the first electrode and the second electrode of the battery cell to opposite polarities.

JP 2014-235833 A

  However, when the current collector is fixed by the fixing portion, air may exist between one plane of the current collector and the inner surface of the outer bag, and the air enters between the first electrode and the current collector. As a result, the adhesion between the first electrode and the current collector may be reduced. In addition, the current collector may be deformed due to the air existing between one plane of the current collector and the inner surface of the outer bag, and the adhesion between the first electrode and the current collector may be reduced. When the adhesion between the first electrode and the current collector is lowered, there is a problem that the contact resistance is increased and the function as a battery is lowered.

  The embodiments of the present disclosure have been made in view of such circumstances, and the object of the present disclosure is to suppress an increase in contact resistance by suppressing a decrease in adhesion between the electrode and the current collector, and to improve the function. It is providing the manufacturing method of the battery cell which can prevent a fall, a battery, and a battery cell.

  A battery cell according to an embodiment of the present disclosure includes a sheet-shaped outer bag, a first through-hole penetrating the outer bag, and an inner surface of the outer bag. A flat plate-like first current collector covering the first current collector, a flat plate-like first electrode provided on the other plane of the first current collector, and a peripheral edge of the first current collector, And a fixing portion for fixing the first current collector to the inner surface of the outer bag.

  In the battery cell manufacturing method according to an embodiment of the present disclosure, a flat plate current collector is provided on one plane of the first sheet body provided with a through hole, and the through hole is provided on one plane of the current collector. An electrode is provided on the other plane of the current collector, a fixing portion for fixing the current collector on one plane of the first sheet body is provided along the periphery of the current collector, and is in a reduced pressure state. Below, the peripheral part of a 2nd sheet | seat body is joined to the peripheral part of a said 1st sheet | seat body, It is characterized by the above-mentioned.

  According to the embodiment of the present disclosure, it is possible to suppress an increase in contact resistance by suppressing a decrease in adhesion between the electrode and the current collector, and to prevent a decrease in function.

3 is a plan view of the battery cell according to Embodiment 1. FIG. It is sectional drawing by the II-II line of FIG. It is explanatory drawing of the manufacturing method of a battery cell. It is explanatory drawing of the manufacturing method of a battery cell. 6 is a cross-sectional view of a battery cell according to Embodiment 2. FIG. 6 is a cross-sectional view of a battery according to Embodiment 3. FIG. It is explanatory drawing of an assembly of a battery. 6 is a cross-sectional view of a battery according to Embodiment 4. FIG. 6 is a partial cross-sectional view of a battery cell included in a battery according to Embodiment 5. FIG. It is sectional drawing by the XX line of FIG. FIG. 10 is a partial cross-sectional view of a battery cell included in a battery according to Embodiment 6. It is sectional drawing by the XII-XII line | wire of FIG. It is explanatory drawing of the shape of the adhering sheet | seat in the battery cell with which the battery which concerns on Embodiment 7 is provided.

Hereinafter, the present disclosure will be described in detail with reference to the drawings illustrating embodiments thereof.
(Embodiment 1)
1 is a plan view of the battery cell according to Embodiment 1. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1 and 2, reference numeral 100 denotes a battery cell of a vanadium redox secondary battery. The vanadium redox secondary battery is configured by housing one or a plurality of battery cells 100 in a case (not shown). The battery cell 100 has the 1st electrode unit 1 which makes a negative electrode, and the 2nd electrode unit 2 which makes a positive electrode. In addition, the battery 100 includes a non-conductive and electrolyte solution-impermeable outer package 101, and the outer package 101 is formed by a first sheet body and a second sheet body, which will be described later.

  The first electrode unit 1 includes a first sheet body 10, a first current collector 11, a first sealant 12, and a first electrode 13. The first sheet body 10 has a quadrangular shape and is non-conductive and non-permeable to electrolyte. The first sheet body 10 forms part of the outer bag 101 of the battery cell 100. A rectangular first through hole 10 a is provided at the center of the first sheet body 10.

  The first current collector 11 has a rectangular flat plate shape, and the area of both planes of the first current collector 11 is wider than that of the first through hole 10a. The 1st electrical power collector 11 is distribute | arranged to the inner surface of the 1st sheet | seat body 10 so that the 1st through-hole 10a may be covered by one plane. The first current collector 11 has a square shape, and includes a first conductor 11a whose one plane is in contact with the inner surface of the first sheet body 10, and a first covering sheet 11b that covers the other plane of the first conductor 11a. . One plane of the first cover sheet 11b is in contact with the other plane of the first conductor 11a.

  The first conductor 11a is preferably a highly conductive metal such as copper, aluminum, nickel, or titanium. The first covering sheet 11b has conductivity and electrolyte solution impermeability. For example, a sheet obtained by stacking a graphite sheet and a conductive sheet for adhesion, a conductive film, and a sheet-like conductive rubber are used. Also good. Further, instead of the first cover sheet 11b, the first conductor 11a may be coated with graphite.

  The first sealant 12 is non-conductive and electrolyte-impermeable, has a rectangular frame shape, and extends along the inner circumference from the first cylindrical portion 12a and one axial end portion of the first cylindrical portion 12a. And a first edge portion 12b protruding inward. The first cylindrical portion 12 a covers the side surface of the first current collector 11. The 1st edge part 12b covers the peripheral part of the other plane of the 1st coating sheet 11b, and is adhering to this peripheral part. The other end of the first cylindrical portion 12 a is fixed to the inner surface of the first sheet body 10.

  The first sealant 12 is fixed by, for example, heat welding using a first sealant 12 made of a thermoplastic resin such as polyethylene or polypropylene. Further, the first sealant 12 is fixed by using, as the first sealant 12, a tape in which an adhesive material is disposed on both sides of the sheet base material or a tape only of an adhesive material having no sheet base material, and depending on its adhesiveness. Also good. As the sheet base material, for example, polyimide is used, and as the adhesive material, an adhesive material such as a silicon resin type or an acrylic resin type is used.

  The first electrode 13 has a rectangular flat plate shape, is provided on the other plane of the first covering sheet 11 b, that is, the other plane of the first current collector 11, and is located on the inner side of the first edge portion 12 b of the first sealant 12. doing. The area of both planes of the first electrode 13 is smaller than the first through hole 10 a of the first sheet body 10, and the first electrode 13 is disposed on the inner side of the through hole 10 a in the plan view of the cell 100. One plane of the first electrode 13 is in contact with the first cover sheet 11b.

  The first electrode 13 is obtained by applying a solution or a semi-solid material containing an active material, a carbon material as a conductive additive, a binder and a non-aqueous solvent to the first cover sheet 11b and volatilizing the non-aqueous solvent. It is formed by including an acidic electrolytic solution. Examples of non-aqueous solvents include N-methylpyrrolidone (NMP), methyl ethyl ketone (MEK), and tetrahydrofuran (THF). Alternatively, the first electrode 13 may be formed by blending an electrolytic solution, obtaining a kneaded material, rolling, and punching.

The vanadium ions or vanadium-containing ions contained in the active material of the first electrode 13 of the first electrode unit 1 functioning as the negative electrode are vanadium ions whose oxidation number changes between divalent and trivalent by an oxidation-reduction reaction. Preferably there is. Examples of vanadium ions whose oxidation number varies between divalent and trivalent include V ²⁺ (II) and V ³⁺ (III).

Examples of the vanadium compound that is an active material for the negative electrode include vanadium sulfate (II) (VSO ₄ · nH ₂ O) and vanadium sulfate (III) (V ₂ (SO ₄ ) ₃ · nH ₂ O). Mixtures of these may be used. n is 0 or an integer of 1-10.

  Moreover, it is preferable that the electrolyte solution contained in the first electrode 13 is a sulfuric acid aqueous solution. As the sulfuric acid aqueous solution, for example, a sulfuric acid aqueous solution having a concentration of less than 90% by mass can be used. The amount of the electrolytic solution is, for example, 70 mL of 2M (mol / L) sulfuric acid with respect to 100 g of the vanadium compound.

Examples of the binder include polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), and a copolymer of vinylidene fluoride and hexafluoropropylene (PVDF / HFP).
Examples of the carbon material include carbon black such as acetylene black and ketjen black (registered trademark), and graphite. The carbon material can use 1 type (s) or 2 or more types.

  The first electrode unit 1 further has an ion exchange membrane 14. One plane of the ion exchange membrane 14 is in contact with the other plane of the first electrode 13, and a peripheral portion of the one plane of the ion exchange membrane 14 is fixed to the first sealant 12.

  The ion exchange membrane 14 transmits hydrogen ions. The ion exchange membrane 14 may transmit sulfate ions in addition to hydrogen ions. Further, the ion exchange membrane 14 is an example of a diaphragm that transmits hydrogen ions, and instead of the ion exchange membrane 14, a porous membrane or the like that does not have ion selectivity but has ion permeability may be used.

  The second electrode unit 2 has the same structure as the first electrode unit 1. The second electrode unit 2 includes the first sheet body 10 of the first electrode unit 1, the first current collector 11, the first sealant 12, the second sheet body 20, and the first electrode 13. Two current collectors 21, a second sealant 22, and a second electrode 23 are provided. However, the second electrode unit 2 does not include a member corresponding to the ion exchange membrane 14 of the first electrode unit 1.

  The second sheet body 20 forms part of the outer bag 101 of the cell 100, and the thickness of the second sheet body 20 is the same as the thickness of the first sheet body 10. Similar to the first sheet body 10 of the first electrode unit 1, the second sheet body 20 is non-conductive and electrolyte-impermeable. Similar to the first sheet body 10 of the first electrode unit 1, the second sheet body 20 is provided with a second through hole 20 a in the center. The second current collector 21 includes a second conductor 21a and a second cover sheet 21b, like the first current collector 11 of the first electrode unit 1. Further, like the first sealant 12 of the first electrode unit 1, the second sealant 22 is non-conductive and non-permeable to electrolyte, and has a second cylindrical portion 22a and a second edge portion 22b.

  The second electrode 23 is formed in the same manner as the first electrode 13 of the first electrode unit 1 and contains an active material, a carbon material as a conductive additive, a binder, and an acidic electrolyte solution. Unlike the case, it contains an active material for a positive electrode. One plane of the second electrode 23 is in contact with the second covering sheet 21b.

The vanadium ion or the vanadium-containing ion contained in the active material of the second electrode 23 of the second electrode unit 2 functioning as the positive electrode contains vanadium whose oxidation number changes between pentavalent and tetravalent by an oxidation-reduction reaction. It is preferably an ion. The ion containing pentavalent and tetravalent vanadium oxidation number changes ^{between, VO 2+ (IV), VO} 2 + (V) are exemplified.

Examples of the vanadium compound that is an active material for the positive electrode include vanadium oxide (IV) (VOSO ₄ · nH ₂ O) and vanadium oxide (V) ((VO ₂ ) ₂ SO ₄ · nH ₂ O). . Mixtures of these may be used. n is an integer of 0-5.

The first electrode unit 1 and the second electrode unit 2 are arranged so that the first electrode 13 and the second electrode 23 face each other with the ion exchange membrane 14 interposed therebetween. The other plane of the ion exchange membrane 14 is in contact with the other plane of the second electrode 23. The peripheral edge portion of the first sheet body 10 and the peripheral edge portion of the second sheet body 20 are joined, and the outer bag 101 of the cell 100 is formed by the first sheet body 10 and the second sheet body 20.
The exterior bag 101 may be formed by folding a rectangular sheet into two and joining the opposing portions at the peripheral edge of the sheet.

Reactions of the following formulas (1) and (2) occur between the first electrode 13 and the second electrode 23 facing each other through the ion exchange membrane 14.
Positive electrode: VOX ₂ · nH ₂ O (s) ⇔VO ₂ X · (n−1) H ₂ O (s) + HX + H ⁺ + e ⁻ (1)
Negative electrode: VX ₃ · nH ₂ O (s) + H ⁺ + e ⁻ ⇔VX ₂ · nH ₂ O (s) + HX (2)
In the formula, X represents a monovalent anion. When X is an m-valent anion, the coupling coefficient (1 / m) is considered. n can take various values depending on the type of vanadium compound.

  Charging / discharging of the battery cell 100 is performed using reaction of Formula (1) and Formula (2). Protons move between the first electrode 13 and the second electrode 23 via the ion exchange membrane 14 in the reactions of the formulas (1) and (2).

  Here, in the first conductor 11 a of the first current collector 11, the portion exposed from the first through hole 10 a of the first sheet body 10 and the second conductor 20 a of the second current collector 21 are The part exposed from the 2nd through-hole 20a of the sheet | seat body 20 is connected with a load or a charger, etc., and the electronic exchange with the exterior is performed.

  According to said structure, the air which exists between the one plane of the 1st electrical power collector 11 and the inner surface of the 1st sheet | seat body 10, and between the 1st sealant 12 and the side surfaces of the 1st electrical power collector 11 is made into 1st. It can discharge | emit to the exterior of the 1st sheet | seat body 10 from the through-hole 10a, and can reduce. Thereby, the fall of the adhesiveness of the 1st electrode 13 and the 1st electrical power collector 11 can be suppressed, the raise of contact resistance can be reduced, and the fall of the function as a battery can be prevented.

  Similarly, in the second electrode unit 2, it is possible to suppress a decrease in adhesion between the second electrode 23 and the second current collector 21, reduce an increase in contact resistance, and prevent a decrease in function as a battery.

Since one plane of the first current collector 11 is larger than the first through hole 10a, it is possible to prevent the first current collector 11 from falling out of the outer bag 101 from the first through hole 10a.
Both planes of the first electrode 13 are smaller than the first through-hole 10a, and the first electrode 13 is located on the inner side of the through-hole 10a in the plan view of the cell 10, so that the pressure from the first through-hole 10a When the battery cell 100 is manufactured by adding the pressure, pressure can be applied to the entire first electrode 13. Thereby, the adhesiveness of the 1st electrode 13 and the 1st electrical power collector 11 can be improved. Similarly, the adhesion between the second electrode 23 and the second current collector 21 can be improved.

  The first current collector 11 has a portion exposed from the first through hole 10a, and the second current collector 21 has a portion exposed from the second through hole 20a. Two electrodes 23 are opposed to each other. Therefore, the battery cells 100 can be electrically connected to an external load through the exposed portions of the first current collector 11 and the second current collector 21.

  By using vanadium ions or ions containing vanadium as an active material, the first electrode 13 and the second electrode 23 can be configured with the same positive electrode and negative electrode active materials, which facilitates battery design.

  Hereinafter, a method for manufacturing the battery cell 100 will be described. 3 and 4 are explanatory diagrams of a method for manufacturing the battery cell 100. FIG. First, as shown to FIG. 3A, the 1st electrical power collector 11 is distribute | arranged to one plane of the 1st sheet | seat body 10 so that one plane may cover the 1st through-hole 10a.

  Next, as shown to FIG. 3B, the 1st electrode 13 is provided on the 1st coating sheet 11b, leaving a peripheral part. Thereafter, as shown in FIG. 3C, the first sealant 12, the cylindrical portion 12a covers the side surface of the first current collector 11, and the edge portion 12b covers the peripheral portion of the other flat surface of the first covering sheet 11b. Arrange as follows. At this time, the other end portion of the cylindrical portion 12a is fixed to one plane of the first sheet body 10, and the edge portion 12b is fixed to the first covering sheet 11b.

  Thereafter, as shown in FIG. 3D, the ion exchange membrane 14 is disposed on the first electrode 13, and the peripheral edge portion is fixed to the edge portion 12 b of the first sealant 12. The first electrode 13 contains an electrolytic solution before the ion exchange membrane 14 is fixed to the edge 12b. Accordingly, in the first electrode unit 1, the first electrode 13 is fixed to the edge portion 12 b of the ion exchange membrane 14 in a state where the electrolyte solution is contained.

  Furthermore, the 2nd electrode unit 2 is produced by the procedure similar to the procedure shown to FIG. 3A-FIG. 3C. In addition, in the 2nd electrode unit 2, the 2nd electrode 23 does not contain electrolyte solution at this time.

  Thereafter, as shown in FIG. 4E, the second electrode unit 2 is placed on the first electrode unit 1 manufactured as described above so that the first electrode 13 and the second electrode 23 face each other with the ion exchange membrane 14 therebetween. Laminate. And in the 1st sheet | seat body 10 and the 2nd sheet | seat body 20, only the one side part which opposes is left under a pressure-reduced state, and the remaining three side parts are fixed. Thereby, the opening 102 is formed. Thereafter, an electrolytic solution to be impregnated into the second electrode 23 is injected from the opening 102 under a reduced pressure state, and the one side portions of the first sheet body 10 and the second sheet body 20 are fixed to each other. Thereby, as shown to FIG. 4F, the battery cell 100 is produced. Note that only the fixing of the one side portions may be performed under reduced pressure. Here, one plane of the first sheet body 10 corresponds to the inner surface.

  According to said manufacturing method, the air which exists between the one plane of the 1st electrical power collector 11 and the inner surface of the 1st sheet body 10 is discharged | emitted from the 1st through-hole 10a to the exterior of the 1st sheet body 10, Can be reduced. Therefore, when joining the peripheral part of the 1st sheet body 10 and the 2nd sheet body 20 in a pressure-reduced state, it can prevent that the 1st electrical power collector 11 deform | transforms with air. Thereby, the fall of the adhesiveness of the 1st electrode 13 and the 1st electrical power collector 11 is suppressed, the raise of contact resistance can be reduced, and the fall of the function as a battery can be prevented. Similarly, in the second electrode unit 2, it is possible to prevent the function of the battery from being lowered.

(Embodiment 2)
In the second embodiment, the structure of the second electrode unit 2 is different from that of the first embodiment. FIG. 5 is a cross-sectional view of battery cell 100 according to the second embodiment. About the structure of the battery which concerns on Embodiment 2, about the structure similar to Embodiment 1, the same code | symbol is attached | subjected and the detailed description is abbreviate | omitted.

  In the second electrode unit 2 according to Embodiment 2, the second current collector 21 has only the second conductor 21a made of titanium, and does not have the covering sheet 21b. Further, the second electrode unit 2 has a frame-shaped fixing sheet 25 instead of the second sealant 22.

  A second conductor 21a is disposed on the inner surface of the second sheet body 20 so as to cover the second through-hole 20a with the one plane. The fixing sheet 25 is arranged along the edge of the second through hole 20a of the second sheet body 20 between the peripheral edge of the one plane of the second conductor 21a and the inner surface of the second sheet body 20, and is fixed. Yes. The second electrode 23 is provided on the other plane of the second conductor 21 a and faces the first electrode 13 with the ion exchange membrane 14 interposed therebetween.

  In the above configuration, the air existing between the one plane of the second conductor 21a and the inner surface of the second sheet body 20 is discharged from the second through hole 20a to the outside of the second sheet body 20 and reduced. Can do. Thereby, the fall of the adhesiveness of the 2nd electrode 23 and the 2nd conductor 21a is suppressed, the raise of contact resistance can be reduced, and the fall of the function as a battery can be prevented. The second conductor 21a is titanium and is not corroded by the electrolytic solution included in the second electrode 23. Further, similarly to the first embodiment, it is possible to suppress a decrease in the adhesion between the first electrode 13 and the first current collector 11, reduce an increase in contact resistance, and prevent a decrease in function as a battery.

  Note that the first electrode unit 1 is a positive electrode, and the first conductor 11a is made of titanium, does not have the first covering sheet 11b, and is replaced with the first sealant 12 in the same manner as the second electrode unit 2 described above. A fixing sheet similar to the above may be provided. At this time, the second electrode unit 2 forms a negative electrode.

(Embodiment 3)
Embodiment 3 relates to a battery in which a plurality of battery cells are stacked. FIG. 6 is a cross-sectional view of battery 200 according to the third embodiment. The battery 200 according to Embodiment 3 is a vanadium redox secondary battery, and includes three battery cells 100, 100, 100 housed in a case (not shown) and two conductive plates 3, 3. About the structure of the battery 200 which concerns on Embodiment 3, about the structure similar to Embodiment 1, the same code | symbol is attached | subjected and the detailed description is abbreviate | omitted.

  The three battery cells 100, 100, 100 are arranged side by side so that the outer surfaces of the first sheet body 10 and the second sheet body 20 face each other and contact each other in the adjacent battery cells 100. The second through hole 20a of the battery cell 100 on one end side in the juxtaposed direction (the lowermost side in FIG. 6) and the first through hole 10a of the battery cell 100 in the center are continuous. In addition, the second through hole 20a of the battery cell 100 at the center is connected to the first through hole 10a of the battery cell 100 at the other end side in the stacking direction (the uppermost side in FIG. 6).

The conductive plate 3 may be any member having conductivity, and is formed from, for example, copper, aluminum or the like.
One conductive plate 3 includes one plane of the second current collector 21 and the second through hole 20a in the battery cell 100 on the one end side, and one plane of the first current collector 11 of the battery cell 100 in the center and the second through hole 20a. It is arranged in a space formed by one through hole 10a. One surface of the one conductive plate 3 is in contact with the second current collector 21 in the battery cell 100 on the one end side, and the other surface is in contact with the first current collector 11 in the central battery cell 100. . Here, the area of each plane of one conductive plate 3 is larger than the area of each plane of the first electrode 13 and the second electrode 23.

  The other conductive plate 3 includes the second current collector 21 and the second through hole 20a in the central battery cell 100, and the first current collector 11 and the first through hole 10a in the battery cell 100 on the other end side. It is arranged in the space formed by. One surface of the other conductive plate 3 is in contact with the second current collector 21 in the central battery cell 100, and the other surface is in contact with the first current collector 11 in the battery cell 100 on the other end side. Yes. Here, the area of each plane of the other conductive plate 3 is larger than the area of each plane of the first electrode 13 and the second electrode 23.

  Here, the thickness of each conductive plate 3 corresponds to the thickness of two sheets of the first exterior sheet 10 or the second exterior sheet 20. Therefore, the thickness of the conductive member 3 is twice the thickness of the exterior bag 101.

The battery cells 100 can be electrically connected to each other by the two conductive plates 3 and 3. In addition, since the first current collector 11 of the first electrode unit 1 that forms the negative electrode and the second current collector 21 of the second electrode unit 2 that forms the positive electrode are connected, the three battery cells 100, 100, 100 Are connected in series.
In addition, as long as the battery cells 100 can be electrically connected to each other, instead of the conductive plate 3, a conductive member having another shape that is not a plate shape such as a foil shape may be provided.

  The first current collector 11 in the battery cell 100 on the one end side and the second current collector 21 in the battery cell 100 on the other end side are connected to a load or a charger, etc. Is exchanged.

  FIG. 7 is an explanatory diagram of assembling the battery 200. In assembling the battery 200, the conductive plate 3 is arranged as a member that is thicker than that after the battery 200 is assembled and has a small area on each plane. Each conductive plate 3 is thicker than the thickness of the first sheet body 10 or the second sheet body 20. Therefore, the thickness of the conductive member 3 is thicker than twice the thickness of the exterior bag. Here, the area of each plane of the conductive plate 3 before the assembly of the battery 200 is larger than the area of each plane of the first electrode 13 and the second electrode 23. As indicated by the white arrows in FIG. 7, pressure is applied to the first electrode 13 and the second electrode 23 by applying pressure from both ends of the battery cells 100 in the juxtaposed direction. At this time, pressure is applied to the first electrode 13 and the second electrode 23 by the conductive plate 3, and the conductive plate 3 has the thickness and the area of both planes shown in FIG.

  According to the above configuration, in each battery cell 100, as in the first embodiment, the decrease in the adhesion between the first electrode 13 and the first current collector 11 is suppressed, and the increase in contact resistance is reduced. It is possible to prevent deterioration of the function as a battery. Moreover, the adhesiveness of the 2nd electrode 23 and the 2nd electrical power collector 21 can be improved similarly. Moreover, the capacity | capacitance of the battery 200 can be increased by arranging the some battery cell 100 in parallel.

  Furthermore, since the plurality of cells 100 are arranged side by side so that the outer surfaces of the first sheet body 10 and the second sheet body 20 face each other, it is possible to prevent the cells 100 from being bulky as a whole. Further, the conductive plate 3 has a flat plate shape, and the thickness is equal to or greater than the thickness of the first sheet body 10 or the second sheet body 20 before and after the battery 200 is assembled. When the pressure is applied so as to be sandwiched in the juxtaposed direction, the pressure can be favorably applied to the entire first electrode 13 and the second electrode 23. In addition, since the battery 200 includes the conductive plate 3, there is no need to separately provide a tab member to connect each battery cell 100 and to connect the tab member by pulling it out of the exterior bag. In addition, the manufacturing process can be simplified.

  The number of battery cells 100 is not limited to three, and the battery 200 may include two or less battery cells 100 or four or more battery cells 100.

(Embodiment 4)
The fourth embodiment is different from the third embodiment in the structure of the battery and the polarity of the electrodes. FIG. 8 is a cross-sectional view of battery 200 according to the fourth embodiment. About the structure of the battery which concerns on Embodiment 4, about the structure similar to Embodiment 1 and Embodiment 3, the same code | symbol is attached | subjected and the detailed description is abbreviate | omitted.

  In the battery cell 100 provided in the battery 200 according to Embodiment 4, the arrangement of the first electrode unit 1 and the second electrode unit 2 is switched in the battery cell 100 at the center in the juxtaposed direction. The second through hole 20a of the battery cell 100 at the center is opposed to the second through hole 20a of the battery cell 100 at one end side in the juxtaposition direction. Moreover, the 1st through-hole 10a of the battery cell 100 in the other end side of the juxtaposition direction and the 1st through-hole 10a of the battery cell 100 in the center are facing.

  The thickness of each conductive plate 3 is equal to or greater than the thickness of two sheets of the first sheet body 10 and the second sheet body 20. One surface of one conductive plate 3 is in contact with the second current collector 21 in the battery cell 100 on the one end side, and the other surface is in contact with the second current collector 21 in the central battery cell 100. One surface of the other conductive plate 3 is in contact with the first current collector 11 in the central battery cell 100, and the other surface is in contact with the first current collector 11 in the battery cell 100 on the other end side. ing. Accordingly, each conductive plate 3 electrically connects the battery cells 100, and the first current collectors 11 of the first electrode unit 1 forming a negative electrode and the second current collector of the second electrode unit 2 forming a positive electrode. The bodies 21 are connected to each other, and the battery cells 100, 100, 100 are connected in parallel.

  The battery 200 includes tabs 30 and 31. The tab 30 is connected to the side surface of the other conductive plate 3. The tab 31 is connected to the side surface of the one conductive plate 3.

  For example, the first current collector 11 and the tab 30 in the battery cell 100 on the one end side and the second current collector 21 and the tab 31 in the battery cell 100 on the other end side are respectively connected to different tabs. The other tab is connected to a load, a charger, or the like, thereby exchanging electrons with the outside.

According to the above configuration, in each battery cell 100, as in the first embodiment, the decrease in the adhesion between the first electrode 13 and the first current collector 11 is suppressed, and the increase in contact resistance is reduced. It is possible to prevent deterioration of the function as a battery. Moreover, the adhesiveness of the 2nd electrode 23 and the 2nd electrical power collector 21 can be improved similarly.
Since the thickness of the conductive plate 3 is equal to or greater than the thickness of the first sheet body 10 and the second sheet body 20, the plurality of battery cells 100 are sandwiched in the juxtaposition direction as in the third embodiment. When pressure is applied, the pressure can be applied to the first electrode 13 and the second electrode 23 satisfactorily.

In FIG. 8, adjacent electrode units 100 are not in contact with the outer surface of the outer bag 101, but the outer bag 101 may be in contact with the tab 30 or the tab 31.
Further, the number of battery cells 100 is not limited to three, and the battery 200 may include two or less battery cells 100 or four or more battery cells 100.

(Embodiment 5)
In the fifth embodiment, the structure of the battery cell is different from the first and third embodiments. 9 is a partial cross-sectional view of battery cell 100 provided in battery 200 according to Embodiment 5, and FIG. 10 is a cross-sectional view taken along line XX of FIG. About the structure of the battery 200 which concerns on Embodiment 5, about the structure similar to Embodiment 1 and Embodiment 3, the same code | symbol is attached | subjected and the detailed description is abbreviate | omitted.

  In the battery cell 100 according to Embodiment 5, the first electrode unit 1 includes a frame-shaped fixing sheet 15 in addition to the first sealant 12. Here, the 1st sealant 12 and the adhering sheet | seat 15 make a fixed part, respectively. The fixing sheet 15 is disposed along the peripheral edge portion of the first current collector 11 between one plane of the first current collector 11 and the inner surface of the first sheet body 10. The fixing sheet 15 is fixed to the peripheral edge portion of the first current collector 11 on one plane and the inner surface of the first sheet body 10. The fixing of the fixing sheet 15 is performed by heat welding or adhesion, similarly to the fixing of the first sealant 12.

  Further, the first sheet body 10 is provided with a plurality of first through holes 10a (16 in FIG. 10) at positions corresponding to the inside of the fixing sheet 15.

  Further, the first cylindrical portion 12 a of the first sealant 12 covers the side surface of the fixing sheet 15 in addition to the side surface of the first current collector 11.

According to said structure, the air which exists between the one plane of the 1st electrical power collector 11 and the inner surface of the 1st sheet | seat 10 is discharged | emitted from the some 1st through-hole 10a to the exterior of the 1st sheet | seat 10, and is reduced. can do. Thereby, the fall of the adhesiveness of the 1st electrode 13 and the 1st electrical power collector 11 is suppressed, the raise of contact resistance can be reduced, and the fall of the function as a battery can be prevented.
The first current collector 11 can be positioned by the fixing sheet 15. Moreover, since the 1st electrical power collector 11 is fixed with the 1st sealant 12 and the adhering sheet | seat 15, it can fix more firmly.

  The number of first through holes is not limited to 16 shown in FIG. 10, and may be 2 or more and 15 or less, or 17 or more.

(Embodiment 6)
In the sixth embodiment, the structure of the battery cell is different from the first and third embodiments. 11 is a partial cross-sectional view of battery cell 100 provided in battery 200 according to Embodiment 6, and FIG. 12 is a cross-sectional view taken along line XII-XII in FIG. About the structure of the battery 200 which concerns on Embodiment 6, about the structure similar to Embodiment 1 and Embodiment 3, the same code | symbol is attached | subjected and the detailed description is abbreviate | omitted.

  In the battery cell 100 according to Embodiment 6, the first electrode unit 1 includes a fixing sheet 15 in addition to the first sealant 12. Here, the 1st sealant 12 and the adhering sheet | seat 15 make a fixed part, respectively. The fixing of the fixing sheet 15 is performed by heat welding or adhesion, similarly to the fixing of the first sealant 12. The fixing sheet 15 has four linear frame sides 15a, 15b, 15c, and 15d, and the frame sides 15a and 15d are shorter than the frame sides 15b and 15c. The frame side portions 15 a, 15 b, 15 c, and 15 d are positioned along the four sides of the first through hole 10 a between one plane of the first current collector 11 and the inner surface of the first sheet body 10. Further, the frame side portions 15a, 15b, 15c and 15d are separated from the cylindrical body 12a of the first sealant 12 by a predetermined distance. The fixing sheet 15 is fixed to the peripheral edge portion of the first current collector 11 on one plane and the inner surface of the first sheet body 10.

  One end portion of the frame side portion 15a is connected to one end portion of the frame side portion 15b so that the frame side portion 15a and the frame side portion 15b form a right angle. The other end portion of the frame side portion 15b is connected to one end portion of the frame side portion 15c so that the frame side portion 15b and the frame side portion 15c form a right angle. The other end portion of the frame side portion 15c is connected to one end portion of the frame side portion 15d so that the frame side portion 15c and the frame side portion 15d form a right angle. The other end of the frame side 15a and the other end of the frame side 15d are spaced apart. Therefore, the fixing sheet 15 has a frame shape in which one corner of the quadrangle is cut out.

According to the above configuration, the first current collector 11 can be positioned by the frame side portions 15 a, 15 b, 15 c, and 15 d of the fixing sheet 15. Moreover, since the 1st electrical power collector 11 is fixed with the 1st sealant 12 and the adhering sheet | seat 15, it can fix more firmly.
Furthermore, the air existing between one plane of the first current collector 11 and the inner surface of the first sheet body 10 can be reduced by discharging the air from the first through hole 10a to the outside of the first sheet portion 10. Further, the air existing between the frame side portions 15a, 15b, 15c, 15d and the first cylindrical body 12a between the one plane of the first current collector 11 and the inner surface of the first sheet body 10 is transferred to the first through hole. The amount can be reduced by discharging from 10a to the outside of the first sheet portion 10. Thereby, the fall of the adhesiveness of the 1st electrode 13 and the 1st electrical power collector 11 is suppressed, the raise of contact resistance can be reduced, and the fall of the function as a battery can be prevented.

(Embodiment 7)
In the seventh embodiment, the structure of the fixing sheet 15 is different from that of the sixth embodiment. FIG. 13 is an explanatory diagram of the shape of the fixing sheet 15 in the battery cell 100 included in the battery 200 according to the seventh embodiment. About the structure of the battery which concerns on Embodiment 7, about the structure similar to Embodiment 6, the same code | symbol is attached | subjected and the detailed description is abbreviate | omitted.

  The fixing sheet 15 includes linear extending portions 15e, 15f, and 15g in addition to the frame side portions 15a, 15b, 15c, and 15d. The extended portions 15e, 15f, and 15g are shorter than the frame side portions 15b and 15c, and the extended portions 15f and 15g are shorter than the frame side portions 15a and 15d. The extending portions 15e, 15f, and 15g are arranged along the three sides of the first through hole 10a, and are separated from the frame side portions 15a, 15b, and 15c by a predetermined distance.

  One end of the extended portion 15e is connected to the other end of the frame side portion 15d so that the frame side portion 15d and the extended portion 15e form a right angle. The other end of the extending portion 15e is connected to one end of the extending portion 15f so that the extending portions 15e and 15f form a right angle. The other end of the extended portion 15f is connected to one end of the extended portion 15g so that the extended portions 15f and 15g form a right angle. Further, the other end portion of the extending portion 15g is separated from the frame side portion 15d.

According to the above configuration, the first current collector 11 can be positioned by the frame side portions 15a, 15b, 15c, 15d and the extending portions 15e, 15f, 15g. Moreover, since the 1st electrical power collector 11 is fixed with the 1st sealant 12 and the adhering sheet | seat 15, it can fix more firmly.
The air existing between one plane of the first current collector 11 and the inner surface of the first sheet body 10 can be reduced by discharging the air from the first through hole 10a to the outside of the first sheet body 10. Moreover, between the 1st electrical power collector 11 and the 1st sheet | seat body 10, it exists between frame edge part 15a, 15b, 15c, 15d, extension part 15e, 15f, 15g, and the 1st cylindrical body 12a. Air can be discharged from the first through hole 10a to the outside of the first sheet body 10 and reduced. Thereby, the fall of the adhesiveness of the 1st electrode 13 and the 1st electrical power collector 11 is suppressed, the raise of contact resistance can be reduced, and the fall of the function as a battery can be prevented.

In the first to seventh embodiments, the first sheet body 10, the first through hole 10a, the first current collector 11, the first sealant 12, the first electrode 13, the ion exchange membrane 14, and the fixing The shape of the sheet 15 is not limited to a rectangular shape, and may be a circular shape or a polygonal shape.
In addition, the shape of the second sheet body 20, the second through hole 20a, the second current collector 21, the second sealant 22, the second electrode 23, and the fixing sheet 25 is not limited to a square shape, and may be a circle or a polygon. It may be a shape.
Furthermore, the location where the first through hole 10a and the second through hole 20a are provided is not limited to the central portion of the first sheet body 10 or the second sheet body 20, respectively, and the first current collector 11 or the second Any position may be used as long as it is covered with the current collector 21.

  Furthermore, in Embodiment 1, Embodiment 3 to Embodiment 7, the first electrode unit 1 may be a positive electrode and the second electrode unit 2 may be a negative electrode.

  Furthermore, in the above fifth to seventh embodiments, the second electrode unit 2 may have the same structure as the first electrode unit 1, and both the first electrode unit 1 and the second electrode unit 2 are It is good also as a structure.

  As described above, the battery cell according to the embodiment of the present disclosure is disposed on the sheet-shaped outer bag, the first through-hole penetrating the outer bag, and the inner surface of the outer bag, and is formed in a single plane. A flat plate-like first current collector covering the first through-hole, a flat plate-like first electrode provided on the other plane of the first current collector, and a periphery of the first current collector And a fixing portion for fixing the first current collector to the inner surface of the outer bag.

  According to one embodiment of the present disclosure, air existing between one plane of the first current collector and the inner surface of the exterior bag can be reduced by discharging the air from the first through hole to the outside of the exterior bag. Thereby, the fall of the adhesiveness of a 1st electrode and a 1st electrical power collector is suppressed, the raise of contact resistance can be reduced, and the fall of the function as a battery can be prevented.

  In the battery cell according to an embodiment of the present disclosure, the fixing portion has a frame shape, and is fixed to a peripheral portion and a side surface of the other current plane of the first current collector, and an inner surface of the exterior bag. It is characterized by that.

  According to an embodiment of the present disclosure, the air existing between one plane of the first current collector and the inner surface of the outer bag and between the fixing portion and the side surface of the first current collector is removed from the first through hole. It can be discharged outside the bag and reduced. Thereby, the fall of the adhesiveness of a 1st electrode and a 1st electrical power collector is suppressed, the raise of contact resistance can be reduced, and the fall of the function as a battery can be prevented.

  In the battery cell according to an embodiment of the present disclosure, the fixing portion has a frame shape, and is fixed to a peripheral portion of one plane of the first current collector and an inner surface of the exterior bag. And

  According to one embodiment of the present disclosure, air existing between one plane of the first current collector and the inner surface of the exterior bag can be reduced by discharging the air from the first through hole to the outside of the exterior bag. Thereby, the fall of the adhesiveness of a 1st electrode and a 1st electrical power collector is suppressed, the raise of contact resistance can be reduced, and the fall of the function as a battery can be prevented.

  In the battery cell according to an embodiment of the present disclosure, the one plane of the first current collector is larger than the first through hole, and both planes of the first electrode are smaller than the first through hole. It is characterized by that.

  According to an embodiment of the present disclosure, it is possible to prevent the first current collector from falling out of the outer bag from the first through hole. Further, when the first electrode is provided so as to correspond to the position of the first through hole, when the battery cell is manufactured by applying pressure from the first through hole, it is possible to apply the pressure to the entire first electrode satisfactorily. The adhesion between the first electrode and the first current collector can be improved.

  The battery cell which concerns on one Embodiment of this indication is equipped with the said some 1st through-hole in the said exterior bag, It is characterized by the above-mentioned.

  According to an embodiment of the present disclosure, the air existing between one plane of the first current collector and the inner surface of the exterior bag can be discharged and reduced from the plurality of first through holes to the outside of the exterior bag. it can. Thereby, the fall of the adhesiveness of a 1st electrode and a 1st electrical power collector is suppressed, the raise of contact resistance can be reduced, and the fall of the function as a battery can be prevented.

  The battery cell which concerns on one Embodiment of this indication is arranged in the 2nd through-hole which has penetrated the said exterior bag, and the inner surface of the said exterior bag, and is flat form which has covered the 2nd through-hole by one plane. A second current collector, a flat second electrode having a polarity opposite to that of the first electrode, provided on the other surface of the second current collector, facing the first electrode, and the first electrode; And a diaphragm sandwiched between the second electrodes.

  According to an embodiment of the present disclosure, the first current collector has a portion exposed from the first through hole, and the second current collector has a portion exposed from the second through hole. One electrode and the second electrode face each other. Therefore, the battery cells can be electrically connected to an external load through the exposed portions of the first current collector and the second current collector.

  A battery according to an embodiment of the present disclosure is characterized in that the battery cells described above are arranged side by side so that the outer surfaces of the exterior bags face each other in the adjacent battery cells.

  According to one embodiment of the present disclosure, the battery capacity can be increased by arranging a plurality of battery cells in parallel.

  A battery according to an embodiment of the present disclosure includes, in the adjacent battery cells, a portion exposed from the first through hole in the first current collector of one of the battery cells, and another battery cell. A portion of the second current collector exposed from the second through hole is opposed to each other and is connected by a conductive member.

  According to one embodiment of the present disclosure, battery cells can be electrically connected by a conductive member, and the battery cells can be connected in series. In addition, it is not necessary to provide a separate tab member for connecting each battery cell by the conductive member, and to draw out and connect the tab member to the outside of the outer bag, thereby simplifying the battery structure and manufacturing process. Can do.

  In the battery according to an embodiment of the present disclosure, in the adjacent battery cells, portions exposed from the first through hole in the one plane of the first current collector face each other, or the second The portions exposed from the second through holes in the one plane of the current collector face each other and are connected by a conductive member.

  According to one embodiment of the present disclosure, the battery cells can be electrically connected by the conductive member, and the battery cells can be connected in parallel.

  The battery according to an embodiment of the present disclosure is characterized in that the conductive member has a flat plate shape and has a thickness that is twice or more the thickness of the exterior bag.

  According to one embodiment of the present disclosure, when a pressure is applied so as to sandwich a plurality of battery cells in the juxtaposed direction, the pressure can be favorably applied to the first electrode and the second electrode by the conductive member.

  The battery according to an embodiment of the present disclosure is characterized in that the first electrode and the second electrode include an acidic electrolytic solution.

  The battery according to an embodiment of the present disclosure is characterized in that the first electrode and the second electrode contain vanadium ions or ions containing vanadium as an active material.

  According to one embodiment of the present disclosure, by using vanadium ions or ions containing vanadium as an active material, the positive electrode and the negative electrode can be configured to have the same active material in the first electrode and the second electrode. Design becomes easy.

  In the battery cell manufacturing method according to an embodiment of the present disclosure, a flat plate current collector is provided on one plane of the first sheet body provided with a through hole, and the through hole is provided on one plane of the current collector. An electrode is provided on the other plane of the current collector, a fixing portion for fixing the current collector on one plane of the first sheet body is provided along the periphery of the current collector, and is in a reduced pressure state. Below, the peripheral part of a 2nd sheet | seat body is joined to the peripheral part of a said 1st sheet | seat body, It is characterized by the above-mentioned.

  According to an embodiment of the present disclosure, the air existing between one plane of the first current collector and the one plane of the first sheet body is discharged from the first through hole to the outside of the first sheet body and reduced. can do. Therefore, when the peripheral part of a 1st sheet body and a 2nd sheet body is joined in a pressure-reduced state, it can prevent that the 1st electrical power collector 11 deform | transforms with air. Thereby, the fall of the adhesiveness of a 1st electrode and a 1st electrical power collector is suppressed, the raise of contact resistance can be reduced, and the fall of the function as a battery can be prevented.

  The embodiment disclosed this time is to be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. That is, embodiments obtained by combining technical means appropriately changed within the scope of the claims are also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 1st sheet | seat body 10a 1st through-hole 11 1st electrical power collector 12 1st sealant (fixed part)
13 First electrode 14 Ion exchange membrane (diaphragm)
15, 25 Adhering sheet (fixing part)
20 Second sheet body 20a Second through hole 21 Second current collector 23 Second electrode 3 Conductive plate (conductive member)
100 battery cell 101 outer bag 200 battery

Claims (13)

A sheet-shaped outer bag,
A first through hole penetrating the exterior bag;
A flat plate-like first current collector disposed on the inner surface of the outer bag and covering the first through hole with a single plane;
A flat plate-like first electrode provided on the other plane of the first current collector;
A battery cell comprising: a fixing portion that is provided along a periphery of the first current collector and fixes the first current collector to an inner surface of the outer bag. The fixed part has a frame shape,
2. The battery cell according to claim 1, wherein the battery cell is fixed to a peripheral portion and a side surface of the other current plane of the first current collector and an inner surface of the exterior bag.   2. The battery cell according to claim 1, wherein the fixing portion has a frame shape and is fixed to a peripheral portion of one plane of the first current collector and an inner surface of the exterior bag. The one plane of the first current collector is larger than the first through hole,
4. The battery cell according to claim 1, wherein both flat surfaces of the first electrode are smaller than the first through hole. 5.   The battery cell according to any one of claims 1 to 3, wherein the outer bag is provided with a plurality of the first through holes. A second through-hole penetrating the exterior bag;
A flat plate-like second current collector disposed on the inner surface of the outer bag and covering the second through-hole with a single plane;
Provided on the other plane of the second current collector, facing the first electrode, a plate-like second electrode having a polarity opposite to that of the first electrode;
A battery cell according to any one of claims 1 to 5, further comprising a diaphragm sandwiched between the first electrode and the second electrode. The battery cell of Claim 6 is arranged in parallel so that the outer surfaces of the said exterior bag may oppose in the said adjacent battery cell.   In the adjacent battery cells, a portion exposed from the first through hole in the first current collector of one of the battery cells, and the second penetration in the second current collector of another battery cell. The battery according to claim 7, wherein a portion exposed from the hole faces and is connected by a conductive member.   In the adjacent battery cells, the portions exposed from the first through hole in the one plane of the first current collector face each other, or the second current in the one plane of the second current collector. 8. The battery according to claim 7, wherein portions exposed from the through holes face each other and are connected by a conductive member.   10. The battery according to claim 8, wherein the conductive member has a flat plate shape and has a thickness that is twice or more the thickness of the exterior bag.   The battery according to any one of claims 7 to 10, wherein the first electrode and the second electrode contain an acidic electrolyte.   The battery according to claim 7, wherein the first electrode and the second electrode contain vanadium ions or ions containing vanadium as an active material. A flat plate current collector is arranged on one plane of the first sheet body provided with a through hole so as to cover the through hole with one plane of the current collector,
An electrode is provided on the other plane of the current collector,
A fixing portion for fixing the current collector to one plane of the first sheet body is provided along a peripheral edge of the current collector,
The manufacturing method of the battery cell characterized by joining the peripheral part of a 2nd sheet | seat body to the peripheral part of the said 1st sheet | seat body in a pressure-reduced state.

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