JP2011154873A - Solid battery module and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solid battery module actualizing volume saving, and to provide a method of manufacturing the same. <P>SOLUTION: The solid battery module includes two or more units of solid battery units. The two solid battery units connected at a predetermined space and electrically in series are arranged on one collector. In the two solid battery units, on the opposite side to the collector, two mutually different collectors are arranged over an electrode plate. The electrode plate is rolled via an insulator with a direction approximately parallel to the direction of the solid battery units arranged side by side, as an axis, and bent approximately parallel to the rolling axis with the predetermined-space part of the electrode plate as an axis. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a solid battery module capable of realizing volume saving and a manufacturing method thereof.

  The secondary battery can convert the decrease in chemical energy associated with the chemical reaction into electrical energy and perform discharge. In addition, the secondary battery converts electrical energy into chemical energy by flowing current in the opposite direction to that during discharge. The battery can be stored (charged). Among secondary batteries, lithium secondary batteries are widely used as power sources for notebook personal computers, mobile phones, and the like because of their high energy density.

In the lithium secondary battery, when graphite (expressed as C ₆ ) is used as the negative electrode active material, the reaction of the formula (1) proceeds at the negative electrode during discharge.
C ₆ Li → C ₆ + Li ⁺ + e ⁻ (1)
The electrons generated in the formula (1) reach the positive electrode after working with an external load via an external circuit. The lithium ions (Li ⁺ ) generated in the formula (1) move in the electrolyte sandwiched between the negative electrode and the positive electrode by electroosmosis from the negative electrode side to the positive electrode side.

When lithium cobaltate (Li _0.4 CoO ₂ ) is used as the positive electrode active material, the reaction of the formula (2) proceeds at the positive electrode during discharge.
Li _0.4 CoO ₂ + 0.6Li ⁺ + 0.6e ⁻ → LiCoO ₂ (2)
At the time of charging, the reverse reactions of the above formulas (1) and (2) proceed in the negative electrode and the positive electrode, respectively, and in the negative electrode, graphite (C ₆ Li) into which lithium has entered by graphite intercalation is present in the positive electrode. Since lithium cobaltate (Li _0.4 CoO ₂ ) is regenerated, re-discharge is possible.

  Conventionally, battery material technology for the purpose of suppressing the manufacturing cost and simplifying the manufacturing process has been developed. Patent Document 1 discloses a non-aqueous electrolyte secondary battery electrode plate in which a positive electrode active material and a negative electrode active material are separated from each other on the same current collector, and the current collector is made of stainless steel. A technique of a characteristic electrode plate for a non-aqueous electrolyte secondary battery is disclosed.

JP 2001-236946 A

The electrode plate for a non-aqueous electrolyte secondary battery disclosed in Patent Document 1 is designed to be used as a wound electrode as described in paragraph 16 of the specification of the document. . However, in the case of a battery using such a wound electrode, electricity must be taken out from both ends of the winding shaft during use, and there is a risk that the design may be complicated. The volume of is expected to be very large.
The present invention has been accomplished in view of the above circumstances, and an object thereof is to provide a solid battery module capable of realizing volume saving and a manufacturing method thereof.

  The solid battery module of the present invention is a solid battery module having two or more solid battery units, and is electrically connected in series on a single current collector at a predetermined interval. The solid battery unit is arranged, and in each of the two solid battery units, an electrode plate on which two different current collectors are arranged on the side opposite to the current collector is arranged in the direction in which the solid battery units are arranged. The electrode plate is wound through an insulator with a substantially parallel direction as an axis, and is bent substantially parallel to the winding axis with a portion of the electrode plate having the predetermined interval as an axis. To do.

  The solid battery module having such a configuration can be designed with the positive and negative directions of all the solid battery units aligned in the same direction. Further, in the solid battery module having such a configuration, as a result of the electrode plate being wound and bent, the positive and negative total current collecting portions of the module are arranged on one side with respect to the entire module, The dead space of the module structure can be reduced and volume saving can be realized.

  As one form of the solid battery module of the present invention, the same type of electrode active material layers can be formed on both sides of the current collector with the current collector interposed therebetween.

  In the solid battery module of the present invention, terminals are provided at both ends of the circuit of the electrode plate electrically connected in series, and the terminals are arranged at positions where they do not overlap with each other in the bent electrode plate. It is preferable.

  Since the solid battery module having such a configuration is arranged at a position where the two terminals do not overlap, the risk of short circuit can be avoided.

  The method for producing a solid battery module of the present invention is a method for producing a solid battery module comprising two or more solid battery units, wherein a step of preparing a current collector, wherein the two or more solid battery units are formed by the current collector. It has the process of manufacturing the electrode plate connected in series electrically, and the process of winding and bending the said electrode plate.

  According to the present invention, the positive direction and the negative direction of all the solid battery units can be designed in the same direction. Further, according to the present invention, as a result of the electrode plate being wound and bent, the positive and negative total current collecting portions of the module are arranged on one side with respect to the entire module, so that the dead of the module structure Space can be reduced and volume saving can be realized.

It is a disassembled perspective schematic diagram of the 1st example of the electrode plate which comprises the winding type solid battery module which is a typical example of the solid battery module of this invention, and the cross-sectional schematic diagram of the said electrode plate. It is the disassembled perspective schematic diagram of the 2nd example of the electrode plate which comprises the winding type solid battery module which is a typical example of the solid battery module of this invention, and the cross-sectional schematic diagram of the said electrode plate. It is the perspective view of the electrode plate which comprises the winding type solid battery module which is a typical example of the solid battery module of this invention, and the cross-sectional schematic diagram of the said electrode plate. It is a cross-sectional schematic diagram of the typical example of the solid battery module of this invention.

1. Solid battery module The solid battery module of the present invention is a solid battery module comprising two or more solid battery units, and is electrically connected in series at a predetermined interval on one current collector. Two solid battery units are arranged, and in each of the two solid battery units, an electrode plate in which two different current collectors are arranged on the opposite side of the current collector is the solid battery unit. The wire is wound through an insulator with a direction substantially parallel to the alignment direction as an axis, and is bent substantially parallel to the winding axis with the portion of the electrode plate having the predetermined interval as an axis. It is characterized by.

  As a more specific configuration of the present invention, a solid battery module including two or more solid battery units formed by laminating a positive electrode active material layer, a solid electrolyte layer, and a negative electrode active material layer in this order, Two or more units of the solid battery unit are mutually connected so that the same type of electrode active material layers included in the solid battery unit face in opposite directions and the stacking directions of all the solid battery units are aligned. Two solid-state battery units that are separated and arranged in a line substantially in parallel in the stacking direction are each one electrode active material layer, and one current collector on a different type of electrode active material layer Each of the other electrode active material layers, two different current collectors on different types of electrode active material layers, and all the solid battery units are electrically Serially The electrode plate in which the current collector is disposed and terminals are provided at both ends of the electrically connected circuit are substantially parallel to the direction in which the solid battery units are arranged in a row. The wound electrode plate is wound in a direction substantially parallel to the winding axis with a blank portion not in contact with the electrode active material layer on the current collector as a center. A configuration in which an insulating layer is provided on the inner side of the folded portion of the folded electrode plate can be given.

The “solid battery unit” as used in the present invention refers to a battery unit in which all elements such as electrodes and electrolytes are solid. Therefore, for example, a battery using a liquid electrolyte as the electrolyte is not used in the present invention.
A typical example of the “solid battery unit” in the present invention is an all-solid lithium secondary battery. Hereinafter, an example in which the present invention uses an all-solid lithium secondary battery as a solid battery unit will be described in detail.

  Since a commercially available lithium secondary battery uses a flammable organic electrolyte as an electrolyte, strict voltage and temperature management by safety measures is required. On the other hand, in an all-solid lithium secondary battery using a solid electrolyte that is safe and easy to handle as an electrolyte, the safety device in the battery can be simplified, and the volume of the entire battery can be reduced.

  As a result of diligent efforts, the inventors have developed an electrode plate that is a kind of bipolar battery module and includes two or more solid battery units in which a positive electrode active material layer, a solid electrolyte layer, and a negative electrode active material layer are laminated in this order. After winding, it is bent around a blank part not in contact with the electrode active material layer, and the two terminals are arranged on one side with respect to the entire module, thereby reducing the dead space of the module structure. It was found that the volume can be reduced by reducing the volume, and at the same time, high capacity and high power density can be achieved.

Hereinafter, typical examples of the present invention will be described.
FIG. 1 is an exploded perspective schematic view of a first example of an electrode plate constituting a wound solid battery module, which is a typical example of the solid battery module of the present invention, and a cross-sectional schematic view of the electrode plate. In each figure, the thickness of each layer constituting the electrode plate is drawn thick for the sake of explanation. In FIG. 1, the layers shown in the same pattern mean that they are the same type of layers. Moreover, the double wavy line part in a figure means abbreviate | omitting a figure.

FIG. 1A is an exploded perspective schematic view of the electrode plate of the first example, and FIG. 1B is a diagram of the first example cut along the one-dot chain line A in FIG. It is a cross-sectional schematic diagram of an electrode plate.
The electrode plate of the first example includes two or more solid battery units in which the positive electrode active material layer 1, the solid electrolyte layer 3, and the negative electrode active material layer 2 are laminated in this order.

  First, the arrangement of solid battery units will be described. As shown in FIG. 1A, the solid battery units are arranged such that the same type of electrode active material layers included in two adjacent solid battery units 4 face in opposite directions. For example, next to the solid battery unit having the positive electrode active material layer 1 in the upward direction in FIG. 1A, a solid battery unit having the positive electrode active material layer 1 in the downward direction in FIG. ing. Furthermore, the solid battery units 4 are separated from each other and arranged in a line substantially parallel to the stacking direction so that the stacking directions of all the solid battery units 4 (the left-right direction in FIG. 1A) are aligned.

  Next, the arrangement of the current collector will be described by taking as an example the case of the solid battery unit 4a and the solid battery unit 4b in FIG. 1B, which are two adjacent solid battery units. The positive electrode active material layer 1 of the solid battery unit 4a and the negative electrode active material layer 2 of the solid battery unit 4b share one current collector on each active material layer. On the other hand, two different current collectors 5 are disposed on the negative electrode active material layer 2 of the solid battery unit 4a and the positive electrode active material layer 1 of the solid battery unit 4b. Furthermore, as a result of arranging the current collector 5 so that all the solid battery units 4 are electrically connected in series, as shown in FIG. 1B, the current collector 5- Negative electrode active material layer 2-Solid electrolyte layer 3-Positive electrode active material layer 1-Current collector 5-Negative electrode active material layer 2-Solid electrolyte layer 3- ...-Current collector 5-Negative electrode active material layer 2-Solid electrolyte layer 3 A positive electrode plate having a zigzag circuit in which charge / discharge paths are formed in the order of positive electrode active material layer 1 current collector 5 is completed.

In addition, like the electrode plate of this example, it can take the structure that the same kind of electrode active material layer is formed on both surfaces of the current collector 5 with the current collector 5 interposed therebetween.
Moreover, it is preferable that 1 mm or more is ensured for the space | interval of the solid battery units 4 for insulation ensuring and voltage detection.
In order to prevent short circuit after winding, an insulating layer or solid electrolyte layer 9 is appropriately formed on the electrode active material layer located on the opposite side of the solid battery unit 4 with the current collector 5 interposed therebetween. Preferably it is.

  The current collector used in the present invention has both a function of securing a charge / discharge path between solid battery units and a function of a base material for an electrode plate. The material of the current collector is not particularly limited as long as it is conductive and can be wound and bent, and is thin. For example, a metal foil can be used. Examples of the metal that can be used for the metal foil include copper, nickel, silver, SUS, aluminum and aluminum alloys, iron, and titanium. Among these, copper, aluminum, and SUS are preferably used.

  FIG. 2 is an exploded perspective schematic view of a second example of an electrode plate constituting a wound solid battery module, which is a typical example of the solid battery module of the present invention, and a cross-sectional schematic view of the electrode plate. In each figure, the thickness of each layer constituting the electrode plate is drawn thick for the sake of explanation. In FIG. 2, the layers shown in the same pattern and the double wavy line in the figure mean the same as those in FIG.

FIG. 2A is an exploded perspective schematic view of the electrode plate of the second example, and FIG. 2B is a sectional view of the second example cut along the one-dot chain line A in FIG. It is a cross-sectional schematic diagram of an electrode plate.
The electrode plate of the second example forms a bipolar structure as in the first example shown in FIG. 1 except that the electrode active material layer is disposed only on one side of the current collector.
In order to prevent a short circuit after winding, it is preferable that an insulating layer or a solid electrolyte layer 9 is appropriately formed on the surface of the current collector 5 on which the electrode active material layer is not formed.

  In the case where the solid battery unit is formed only on one side of the current collector as in this example, in consideration of the electrode potential derived from the material used for the positive electrode active material layer and the negative electrode active material layer described later, the solid battery unit It is preferable that the surface of the current collector on which the battery unit is not formed is coated with an electrically stable conductive material, or the interface between each layer of the solid battery unit and the current collector is clad. .

FIG. 3 is a perspective view of an electrode plate constituting a wound solid battery module, which is a typical example of the solid battery module of the present invention, and a schematic cross-sectional view of the electrode plate. The electrode plate 8 shown in FIG. 3 is obtained by winding the electrode plate shown in FIG. 1 (a) or FIG. 2 (a) in the direction of the arrow described as “winding direction” in FIG. It corresponds to.
FIG. 3A is a perspective view of the electrode plate before bending. In the electrode plate shown in FIG. 3A, the electrode plate shown in FIG. 1A or 2A is wound around a direction substantially parallel to the direction in which the solid battery units are arranged in a line. It was obtained as a result. In addition, the solid battery unit 4a, 4b, 4c, or 4d surrounded by the one-dot chain line in FIG. 1B or FIG. 2B corresponds to 4a, 4b, 4c, or 4d in FIG. .
FIG. 3B is a schematic cross-sectional view of the electrode plate 8 shown in FIG. FIG. 3B shows a case where the current collector 5 in which the electrode active material layer is arranged on one side is used (that is, the second example of the electrode plate). As can be seen from FIG. 3B, an insulating layer or a solid electrolyte layer 9 is interposed between the current collectors 5 so that the current collectors 5 overlap each other after winding. Yes.
As shown by a white arrow in FIG. 3B, after winding, it is preferable to process from a cylindrical structure to a square structure by applying a plane press in a direction perpendicular to the winding axis.

FIG. 4 is a schematic cross-sectional view of a typical example of the solid battery module of the present invention.
In the module 100 shown in FIG. 4, the electrode plate 8 shown in FIG. 3 is bent in a direction substantially parallel to the winding axis at the current collector 5a, and the insulating layer 10 and the terminal 6 or 7 are further provided. It corresponds to a module that is installed and housed in the housing 11.
The position at which the electrode plate is bent is not particularly limited as long as the electrode plate is bent in a direction substantially parallel to the winding axis with a blank portion where the electrode active material layer on the current collector is not in contact as a center. As a specific example of the position where the electrode plate is bent, as shown in FIG. 4, an example in which the electrode plate is bent at substantially the center of the wound body is given.

The bent electrode plate further has an insulating layer 10 inside the portion where the electrode plate is folded.
The material of the insulating layer is preferably excellent in alkali resistance, heat resistance and thermal conductivity, and is flame retardant. Specifically, inorganic insulators such as aluminum nitride (AlN) and silicon carbide (SiC), chlorosulfonated polyethylene rubber, butyl rubber, ethylene-propylene rubber, phenyl-methyl silicone rubber, fluorine rubber, hydrogenated nitrile rubber , Organic insulators such as allyl resin, furan resin, epoxy resin and the like molded into a solid form.
The outer shape of the insulating layer is not limited as long as it can be disposed at least between the overlapping solid battery units and between the current collectors. From the viewpoint of measuring the entire solid battery module, the inside of the insulating layer may have a honeycomb structure.

  Although not shown in FIG. 4, in order to improve the heat dissipation of the solid battery module, an alumina or metal heat sink is installed inside the folded portion of the electrode plate, or alumina or A heat radiation improving ceramic such as BN (boron nitride) may be mixed.

As shown in FIG. 4, the terminals provided on both ends of the circuit of the electrode plate electrically connected in series are positioned on one side of the whole solid battery module as shown in FIG. It is preferable to do.
Further, from the viewpoint of avoiding the danger of short circuit, it is preferable that the terminals are arranged at positions that do not overlap each other in the bent electrode plate.
The terminal is not particularly limited as long as it is made of a conductive material, and specifically, aluminum, copper, SUS, and titanium terminals can be used.

  As shown in FIG. 4, a housing 11 that houses a bent electrode plate can also be used. The shape of the housing is not particularly limited as long as it can accommodate the electrode plate described above, and specific examples include a cylindrical shape, a square shape, a coin shape, and a laminate shape.

  Hereinafter, the positive electrode active material layer, the negative electrode active material layer, the solid electrolyte layer, and the current collector in the case where the solid battery unit used in the present invention is an all solid lithium secondary battery will be described in detail.

1-1. Positive electrode active material layer and negative electrode active material layer As the positive electrode active material in the positive electrode active material layer used in the present invention, specifically, LiCoO ₂ , LiNi _1/3 Mn _1/3 Co _1/3 O ₂ , LiNiPO ₄ , LiMnPO ₄ , LiNiO ₂ , LiMn ₂ O ₄ , LiCoMnO ₄ , Li ₂ NiMn ₃ O ₈ , Li ₃ Fe ₂ (PO ₄ ) ₃ and Li ₃ V ₂ (PO ₄ ) ₃ . Among these, in the present invention, LiCoO ₂ is preferably used as the positive electrode active material.

  The thickness of the positive electrode active material layer used in the present invention varies depending on the intended use of the lithium secondary battery, but is preferably in the range of 10 μm to 250 μm, and in the range of 20 μm to 200 μm. It is particularly preferred that it is most preferably in the range of 30 μm to 150 μm.

  The average particle diameter of the positive electrode active material is, for example, preferably in the range of 1 μm to 50 μm, more preferably in the range of 1 μm to 20 μm, and particularly preferably in the range of 3 μm to 5 μm. If the average particle size of the positive electrode active material is too small, the handleability may be deteriorated. If the average particle size of the positive electrode active material is too large, it may be difficult to obtain a flat positive electrode active material layer. Because. The average particle diameter of the positive electrode active material can be determined by measuring and averaging the particle diameter of the active material carrier observed with, for example, a scanning electron microscope (SEM).

The positive electrode active material layer may contain a conductive material, a binder, and the like as necessary.
The conductive material included in the positive electrode active material layer used in the present invention is not particularly limited as long as the conductivity of the positive electrode active material layer can be improved. For example, carbon black such as acetylene black and ketjen black Etc. Moreover, although content of the electrically conductive material in a positive electrode active material layer changes with kinds of electrically conductive material, it is in the range of 1 mass%-10 mass% normally.

  Examples of the binder included in the positive electrode active material layer used in the present invention include polyvinylidene fluoride (PVDF) and polytetrafluoroethylene (PTFE). Further, the content of the binder in the positive electrode active material layer may be an amount that can fix the positive electrode active material or the like, and is preferably smaller. The content of the binder is usually in the range of 1% by mass to 10% by mass.

  In order to enhance the lithium ion acceptance performance of the negative electrode during charging, the positive electrode active material layer has a width and length that are 0.5 mm or more smaller than the width and length of the negative electrode active material layer, respectively. Is preferably formed.

  The negative electrode active material used for the negative electrode active material layer is not particularly limited as long as it can occlude / release lithium ions. For example, metal lithium, lithium alloy, metal oxide, metal sulfide, Examples thereof include metal nitrides and carbon materials such as graphite. The negative electrode active material may be in the form of a powder or a thin film.

The negative electrode active material layer may contain a conductive material, a binder, and the like as necessary.
As the binder and the conductive material that can be used in the negative electrode active material layer, those already described in the description of the positive electrode active material layer can be used. Moreover, it is preferable to select the usage-amount of a binder and a electrically conductive material suitably according to the use etc. of a lithium secondary battery. Further, the film thickness of the negative electrode active material layer is not particularly limited, but for example, it is preferably in the range of 10 μm to 100 μm, and more preferably in the range of 10 μm to 50 μm.

  The positive electrode active material layer and the negative electrode active material layer may further contain an electrode electrolyte. In this case, a solid electrolyte described later can be used as the electrode electrolyte.

1-2. Solid Electrolyte Layer The solid electrolyte in the solid electrolyte layer used in the present invention is not particularly limited as long as it has ionic conductivity and is in a solid form at room temperature (15 ° C. to 25 ° C.). As the solid electrolyte used in the present invention, specifically, an oxide solid electrolyte, a sulfide solid electrolyte, or the like can be used.
Specifically, as the oxide-based solid electrolyte, LiPON (lithium phosphate oxynitride), Li _1.3 Al _0.3 Ti _0.7 (PO ₄ ) ₃ , La _0.51 Li _0.34 TiO _Examples include _0.74 , Li ₃ PO ₄ , Li ₂ SiO ₂ , Li ₂ SiO ₄ , Li _0.5 La _0.5 TiO ₃ , Li _1.5 Al _0.5 Ge _1.5 (PO ₄ ) _{3 and the} like. can do.
Specific examples of the sulfide-based solid electrolyte include Li ₂ S—P ₂ S ₅ , Li ₂ S—P ₂ S ₃ , Li ₂ S—P ₂ S ₃ —P ₂ S ₅ , and Li ₂ S—SiS. _{2, LiI-Li 2 S-} P 2 S 5, LiI-Li 2 S-SiS 2 -P 2 S 5, Li 2 S-SiS 2 -Li 4 SiO 4, Li 2 S-SiS 2 -Li 3 PO 4 Li ₃ PS ₄ -Li ₄ GeS ₄ , Li _3.4 P _0.6 Si _0.4 S ₄ , Li _3.25 P _0.25 Ge _0.76 S ₄ , Li _4-x Ge _1-x P _x S ₄ , Li ₇ P ₃ S _{11 and the} like can be exemplified.

The solid battery unit used in the present invention is not necessarily limited to the above-described all solid lithium secondary battery. That is, any solid battery in which the positive electrode active material layer, the solid electrolyte layer, and the negative electrode active material layer are laminated in this order is included in the solid battery unit used in the present invention.
Examples of the solid battery unit used in the present invention include a lithium air battery, a lithium secondary battery using a polymer electrolyte, and the like in addition to the all solid lithium secondary battery.

2. The manufacturing method of a solid battery module The manufacturing method of the solid battery module of this invention is a manufacturing method of a solid battery module provided with 2 units or more of solid battery units, Comprising: The process which prepares a collector, Two or more said solid battery units Includes a step of manufacturing an electrode plate electrically connected in series by the current collector, and a step of winding and bending the electrode plate.

The method for producing a solid battery module of the present invention includes at least (1) a step of preparing a current collector, (2) a step of producing an electrode plate, and (3) a step of winding and bending the electrode plate.
In addition, you may add processes other than said 3 process to the manufacturing method of this invention. For example, after manufacturing the electrode plate, a step of appropriately forming an insulating layer on the electrode plate may be performed, or after the step of winding and bending the electrode plate, the folded electrode plate is housed in the housing. A process or the like may be performed.
Among the above steps, for the step (1), the above-mentioned section “1. Solid battery module” can be referred to.
Hereinafter, each of the steps (2) and (3) will be described in detail.

2-1. Step of Manufacturing Electrode Plate This step is a step of manufacturing an electrode plate in which two or more solid battery units are electrically connected in series by a current collector.
An example of a method for producing an electrode plate using a current collector as a base material will be described. In addition, this process is not necessarily limited only to the following example.
First, a positive electrode active material layer and a negative electrode active material layer are formed on at least one surface of the current collector, with a predetermined interval (the obtained current collector is hereinafter referred to as current collector A). . For each material of the current collector, the positive electrode active material layer, and the negative electrode active material layer, the above-mentioned section “1. Solid battery module” can be referred to.
Next, a solid electrolyte layer is formed on the positive electrode active material layer of the current collector on which the electrode active material layer is thus formed (hereinafter, the obtained current collector is referred to as current collector B). Regarding the material of the solid electrolyte layer, the above-mentioned section “1. Solid battery module” can be referred to.
Subsequently, the current collector A and the current collector B are bonded together so that the negative electrode active material layer of the current collector A and the solid electrolyte layer of the current collector B adhere to each other. By sticking together two different current collectors in this way, the solid electrolyte layer is sandwiched between the negative electrode active material layer of current collector A and the positive electrode active material layer of current collector B. An electrode plate having a solid battery unit formed by laminating a solid electrolyte layer and a negative electrode active material layer in this order is obtained.
An appropriate number of current collectors B are appropriately bonded to the electrode plate by the same operation, thereby completing an electrode plate having a desired number of solid battery units. In addition, it is preferable to adjust a procedure suitably so that the both ends of an electrode plate may become a collector.
A typical example of the electrode plate produced in this step is an electrode plate as shown in FIG. 1 or FIG. In the example shown in FIG. 1 or FIG. 2, the solid battery units are arranged in a line in a predetermined direction.

2-2. Step of winding and bending the electrode plate The winding method in this step is not particularly limited as long as a wound body as shown in FIG. 3 can be obtained. As a winding method, it is preferable that the electrode plate manufactured in the above manufacturing process is wound around a direction substantially parallel to the direction in which the solid battery units are arranged in a line.

In this step, the number of times of bending of the wound electrode plate is not particularly limited, but after being folded, both ends of the wound electrode plate are arranged at positions close to each other with respect to the entire solid battery module. It is preferable. Here, “both ends of the wound electrode plate” are both ends of the electrode plate in the winding axis direction. For example, when the solid battery module is assumed to be a rectangular parallelepiped, it is preferable that both ends of the wound electrode plate are located on the same surface side of the rectangular parallelepiped. Further, the folding position is preferably bent in a direction substantially parallel to the winding axis, with the blank portion not in contact with the solid battery unit on the current collector as the center.
In this step, it is preferable to form an insulating layer inside the folded portion of the solid battery unit from the viewpoint of short circuit prevention.

DESCRIPTION OF SYMBOLS 1 Positive electrode active material layer 2 Negative electrode active material layer 3 Solid electrolyte layer 4,4a, 4b, 4c, 4d Solid battery unit 5 Current collector 5a Current collector 6,7 located in a bending part 7 Terminal 8 Electrode plate 9 Insulating layer or Solid electrolyte layer 10 Insulating layer 11 Housing 100 Typical example of solid battery module of the present invention

Claims (4)

A solid battery module comprising two or more solid battery units,
Two solid battery units electrically connected in series at a predetermined interval are arranged on one current collector,
In each of the two solid battery units, an electrode plate in which two different current collectors are respectively arranged on the side opposite to the current collector,
Wound around an insulator around a direction substantially parallel to the direction in which the solid battery units are arranged,
A solid battery module, wherein the solid battery module is bent substantially parallel to the winding axis, with the electrode plate portion having the predetermined interval as an axis.   The solid battery module according to claim 1, wherein the same type of electrode active material layer is formed on both sides of the current collector with the current collector interposed therebetween. Terminals are provided at both ends of the circuit connected electrically in series with the electrode plate,
3. The solid state battery module according to claim 1, wherein the terminals are arranged at positions that do not overlap each other in the bent electrode plate. A method for producing a solid battery module comprising two or more solid battery units,
Preparing a current collector,
Producing an electrode plate in which two or more of the solid battery units are electrically connected in series by the current collector; and
A method for producing a solid battery module, comprising the step of winding and bending the electrode plate.

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