JP5458841B2 - Solid battery module manufacturing method and solid battery module obtained by the manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a solid battery module, and a solid battery module obtained by the manufacturing method.

  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. A battery that 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 by the equation (1) reach the positive electrode after working with an external load via an external circuit. Then, lithium ions (Li ⁺ ) generated in the formula (1) move from the negative electrode side to the positive electrode side by electroosmosis in the electrolyte sandwiched between the negative electrode and the positive electrode.

Further, 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 + 0.6 Li ⁺ + 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.

  In general, in battery technology, the problems of volume saving and high capacity / high output are difficult to achieve. In other words, the volume of the battery increases as the capacity and output increase, while the power generation performance of the battery must be sacrificed as the volume is reduced. Battery technologies aimed at solving such problems have been developed so far. Patent Document 1 is characterized in that a plurality of solid-state power generation cells composed of a power generation element in which a positive electrode active material, a solid electrolyte, and a negative electrode active material are layered on a sheet having bending properties are arranged in a grid pattern. A sheet battery technology is disclosed.

JP 2000-195482 A

According to paragraph 15 of FIG. 2 and FIG. 2, the sheet-shaped battery disclosed in Patent Document 1 is a plurality of solid-state power generation cells arranged in a grid pattern on a sheet having a current collecting action. It is said that the device can be thinned, the capacity of the power source can be increased, and the flexibility of the entire battery can be achieved. In this battery, according to the description of FIG. 2 of the document, since the sheet outer frame or the sealing material is arranged on the outer periphery of the sandwiching portion of the two sheets having current collecting action, the sealing property of the entire sheet battery is improved. There was a problem.
The present invention has been accomplished in view of the above circumstances, and an object thereof is to provide a solid battery module manufacturing method and a solid battery module obtained by the manufacturing method.

  The method for producing a solid battery module of the present invention includes two or more solid battery units each including at least a positive electrode, a negative electrode, and a solid electrolyte interposed between the positive electrode and the negative electrode, and the solid battery unit has a housing. A method of manufacturing a solid battery module housed in a body, wherein a step of manufacturing a solid battery in which two or more solid battery units are electrically connected in series by a current collector, a step of bending the solid battery, It has the process of attaching a terminal to the both ends of the said solid battery, and the process of accommodating the bent said solid battery in the said housing | casing.

  In the method of manufacturing the solid battery module having such a configuration, since the solid battery is folded and stored in the casing, the terminals can be designed to protrude from one side of the casing. As a result, the opening of the casing can be reduced, and the sealing performance of the casing can be improved.

  It is preferable that the manufacturing method of the solid battery module of the present invention further includes a step of forming an insulating layer on one side or both sides of the current collector in the solid battery.

  The manufacturing method of the solid battery module having such a configuration can suppress the current collector from being wrinkled by the insulating layer when the bent solid battery is stored in the housing.

  The solid battery module of the present invention includes two or more solid battery units each including at least a positive electrode, a negative electrode, and a solid electrolyte interposed between the positive electrode and the negative electrode, and the solid battery unit is housed in a casing. A solid battery module in which two or more solid battery units are electrically connected in series by a current collector and have terminals at both ends, the solid battery comprising at least one current collector. It is bent at an electric part, and both of the two terminals protrude from one side of the casing, and a first insulating layer is arranged inside a portion where the solid battery is folded.

  In the solid battery module having such a configuration, the solid battery is configured such that a plurality of the solid battery units are connected by the current collector, and the protruding positions of the terminals are aligned on one side with respect to the housing. Since it is stored efficiently, both the problems of volume saving and high capacity / high output can be solved.

  In the solid state battery module of the present invention, in the solid state battery, it is preferable that the second insulating layer is disposed without any gap on one side or both sides of the current collector.

  The solid battery module having such a configuration can prevent contact between the solid batteries by the second insulating layer, and can prevent displacement of the solid battery and the current collector.

  According to the present invention, since the solid battery is folded and stored in the housing, the terminals can be designed to protrude from one side of the housing, and as a result, the opening of the housing A part can be made small and the sealing property of the said housing | casing can be improved.

It is a cross-sectional schematic diagram of the solid battery which consists of a solid battery unit and a collector. It is a cross-sectional schematic diagram of the solid battery before and after the step of forming the second insulating layer. It is a cross-sectional schematic diagram of the solid battery by which it bent and the 1st insulating layer was formed. It is a cross-sectional schematic diagram of the solid battery with which the terminal was welded. It is the cross-sectional schematic diagram which showed the middle stage which accommodates a solid battery in a housing | casing. It is a figure which shows an example of the all-solid-state lithium secondary battery which can be used for this invention, Comprising: It is the figure which showed typically the cross section cut | disconnected in the lamination direction. It is the cross-sectional schematic diagram and side view of the typical example of the solid battery module which concerns on this invention.

1. Manufacturing method of solid battery module The manufacturing method of the solid battery module of the present invention includes two or more solid battery units each including at least a positive electrode, a negative electrode, and a solid electrolyte interposed between the positive electrode and the negative electrode, and A method of manufacturing a solid battery module in which the solid battery unit is housed in a housing, wherein a step of manufacturing a solid battery in which two or more solid battery units are electrically connected in series by a current collector, The method includes a step of bending a solid battery, a step of attaching terminals to both ends of the solid battery, and a step of storing the bent solid battery in the housing.

The “solid battery” in the present invention refers to a battery 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 included in the present invention.
The detail of the manufacturing method of the solid battery which can be used for this invention is mentioned later.

The method for producing a solid battery module of the present invention includes at least (1) a step of producing a solid battery, (2) a step of bending the solid battery, (3) a step of attaching terminals to both ends of the solid battery, and (4) A step of storing the folded solid battery in a housing;
Note that the order of the four steps is not particularly limited. Specifically, the process (1), the process (2), the process (3), and the process (4) may be performed in this order, or the process (1), the process (3), the process (2), and the process (4). ). That is, the order of the processes is not particularly limited as long as the solid battery module according to the present invention can be manufactured.
Moreover, you may add other processes other than the said 4 processes. For example, you may perform the process of forming an insulating layer, etc., after forming a solid battery.
Hereinafter, each process of the manufacturing method of the solid battery module which concerns on this invention is demonstrated in detail.

1-1. Step of Producing Solid Battery Among the production methods according to the present invention, the step of producing a solid battery is specifically a solid battery in which two or more solid battery units are electrically connected in series by a current collector. It is the process of manufacturing.
FIG. 1 is a schematic cross-sectional view of a solid battery comprising a solid battery unit and a current collector. In FIGS. 1 to 5 and FIG. 7, the thickness of the components in the solid battery or the solid battery module is emphasized, and all the thicknesses are drawn thick. The solid battery is connected in the order of current collector 2-solid battery unit 1-current collector 2 -...- solid battery unit 1-current collector 2, and current collector 2 is positioned at both ends of the solid battery. doing.
The current collector 2 may be a material obtained by extending the current collecting material of each solid battery unit 1 as it is, or a current collector different from the current collecting material possessed by each solid battery unit 1. The battery unit 1 may be electrically connected to the current collecting material.
The material of the current collector 2 is not particularly limited as long as it is conductive and can be processed thinly. Specific examples include SUS, aluminum, copper, and titanium.

In addition, after this process, it is preferable to further have the process of forming an insulating layer in the single side | surface or both surfaces of a collector in a solid battery. Hereinafter, the insulating layer formed in this step is referred to as a “second insulating layer”.
Here, it is more preferable that the thickness of the second insulating layer has a total thickness substantially equal to the difference between the thickness of the solid battery unit and the thickness of the current collector. “Total thickness approximately equal to the difference between the thickness of the solid battery and the current collector” means that if there is one second insulating layer on each side of the current collector, the total thickness is 2 This means that the sum of the thicknesses of the insulating layers of layers should be approximately equal to the difference between the thickness of the solid battery and the thickness of the current collector.
FIG. 2 is a schematic cross-sectional view of the solid state battery before and after the step of forming the second insulating layer. As can be seen from the cross-sectional view of the solid battery before the step of forming the second insulating layer depicted in FIG. 2A, the thickness 3a of the current collector is usually a solid battery having a laminated structure or a wound structure. It is thinner than the unit thickness 3b. Therefore, as shown in the cross-sectional view of the solid state battery after the step of forming the second insulating layer depicted in FIG. 2B, the second insulating layer 4 having the thickness 3c or the thickness 3d is formed. Accordingly, the thickness of the entire solid battery is made uniform, the current collector is prevented from wrinkling when stored in the subsequent housing, and the unit of the solid battery and the current collector after the housing is stored Misalignment can be prevented.

The material of the second 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 structure of the second insulating layer is not limited as long as the thickness of the entire solid battery can be made uniform, but from the viewpoint of measuring the entire solid battery module, the inside may be a honeycomb structure. Good.

1-2. Step of folding solid battery In this step, the number of times of folding of the solid battery is not particularly limited, but it is preferable that both ends of the solid battery are arranged at positions close to each other with respect to the entire solid battery module after being folded. . For example, if the solid battery module is assumed to be a rectangular parallelepiped, both ends of the solid battery are preferably located on the same surface side of the rectangular parallelepiped. Further, the folding position is preferably not the portion where the solid battery unit is located but the portion where the current collector is located.
In this step, it is preferable to form an insulating layer inside the folded portion of the solid battery from the viewpoint of short circuit prevention. Hereinafter, the insulating layer formed in this step is referred to as a “first insulating layer”.
FIG. 3 is a schematic cross-sectional view of a solid state battery that is bent in this step and has a first insulating layer formed thereon. In this figure, the solid battery in which the second insulating layer 4 has already been formed is drawn.
As can be seen from the figure, since the first insulating layer 5 is located inside the folded portion of the solid battery, the solid battery units 1 and the current collectors 2 do not contact each other. Although only one first insulating layer 5 is drawn in FIG. 3, a plurality of first insulating layers may be provided depending on the number of bendings.
As the material of the first insulating layer, the same material as that of the second insulating layer described above can be used. As the structure of the first insulating layer, the outer shape is not limited as long as it can be disposed at least between overlapping solid battery units and between current collectors, but from the viewpoint of measuring the whole solid battery module, May have a honeycomb structure.

1-3. Step of Attaching Terminals to Both Ends of Solid Battery Among the manufacturing methods according to the present invention, the step of attaching terminals to both ends of the solid battery can be performed at any time regardless of the order. That is, it may be performed after the step of bending the solid battery, or may be performed simultaneously with the step of manufacturing the solid battery. Further, it may be performed simultaneously with the step of forming the second insulating layer.
The method for attaching the terminal to the solid state battery is not particularly limited as long as the conductivity of the terminal is not impaired. A specific example of the attachment method is a method of welding a terminal to a solid battery. As a method of welding the terminals to both ends of the solid battery, a conventional method can be used.
FIG. 4 is a schematic cross-sectional view of a solid state battery to which terminals are attached in this step. One of the two terminals 6 is a positive terminal and the other is a negative terminal depending on the arrangement of the solid battery unit. As can be seen from the figure, the terminal 6 is preferably arranged on one side with respect to the entire solid state battery.
The terminal that can be used in this step is not particularly limited as long as it is made of a conductive material. Specifically, SUS, aluminum, copper, or titanium can be used.

1-4. Step of storing folded solid battery in casing In the manufacturing method according to the present invention, in the step of storing the folded solid battery in the casing, the storing method and the like are appropriately adjusted according to the shape of the casing.
FIG. 5 is a schematic cross-sectional view showing a stage in the middle of housing the solid battery in the housing in this step. FIG. 5 shows an example in which the casing is a rectangular parallelepiped. As shown in the drawing, it is preferable to store the terminal so that the portion where the terminal is located is opposite to the bottom portion (left end portion in the drawing) of the housing. In addition, it is preferable from the viewpoint of volume saving of the entire solid battery module that the solid battery is stored while being pressed in a substantially vertical direction (direction indicated by an arrow 8 in the figure) with respect to the direction in which the casing 7 is stored. .
The shape of the housing is not particularly limited as long as it can accommodate a solid battery, an insulating layer, and the like, and specific examples include a cylindrical shape, a square shape, a coin shape, and a laminate shape. .

The description of each step constituting the method for manufacturing the solid battery module of the present invention is as described above. In addition to these steps, for example, a step of covering the housing after the storage of the solid battery may be added.
Hereinafter, the solid battery unit used in the present invention will be described.

1-5. Production Method of Solid Battery Unit A typical example of the solid battery unit that can be used in the present invention is an all-solid lithium secondary battery. Hereinafter, the case where the solid battery unit of the present invention is an all-solid lithium secondary battery 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.

FIG. 6 is a diagram showing an example of an all-solid lithium secondary battery that can be used in the present invention, and is a diagram schematically showing a cross section cut in the stacking direction. The all solid lithium secondary battery that can be used in the present invention is not necessarily limited to this example. Although FIG. 6 shows only a stacked battery, a wound battery or the like can also be used.
The all solid lithium secondary battery 100 includes a positive electrode 16 containing a positive electrode active material layer 12 and a positive electrode current collector 14, a negative electrode 17 containing a negative electrode active material layer 13 and a negative electrode current collector 15, the positive electrode 16 and the The lithium ion conductive solid electrolyte 11 is sandwiched between the negative electrodes 17.
Hereinafter, the positive and negative electrodes, the lithium ion conductive solid electrolyte, and other components (separator and the like), which are components of the all solid lithium secondary battery that can be used in the present invention, will be described separately.

(Positive electrode and negative electrode)
The positive electrode of the all-solid lithium secondary battery that can be used in the present invention preferably has a positive electrode active material layer having a positive electrode active material. Usually, in addition to this, a positive electrode current collector and the positive electrode current collector are included. It has a positive electrode lead connected to an electric body. The negative electrode of the all-solid lithium secondary battery that can be used in the present invention preferably has a negative electrode active material layer having a negative electrode active material. Usually, in addition to this, a negative electrode current collector and the negative electrode current collector are provided. It has a negative electrode lead connected to an electric body.

(Positive electrode active material layer)
Hereinafter, the case where the positive electrode which has a positive electrode active material layer as a positive electrode is employ | adopted is demonstrated.
Specific examples of the positive electrode active material used in the present invention include 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, Li ₃ V ₂ (PO ₄ ) _{3 and the} like. 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 0.1 μm to 50 μm, more preferably in the range of 0.5 μm to 20 μm, and particularly preferably in the range of 1 μm to 10 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.

(Positive electrode current collector)
The positive electrode current collector used in the present invention has a function of collecting the positive electrode active material layer. Examples of the material for the positive electrode current collector include aluminum, SUS, nickel, iron, and titanium. Of these, aluminum and SUS are preferable. Moreover, as a shape of a positive electrode electrical power collector, foil shape, plate shape, mesh shape etc. can be mentioned, for example, Foil shape is preferable.

(Negative electrode active material layer)
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.

(Negative electrode current collector)
As a material for the negative electrode current collector, copper can be used in addition to the material for the positive electrode current collector described above. Moreover, as a shape of a negative electrode collector, the thing similar to the shape of the positive electrode collector mentioned above is employable.
As a manufacturing method of the negative electrode used in the present invention, a method similar to the manufacturing method of the positive electrode as described above can be adopted.

  The electrode active material layer of at least one of the positive electrode and the negative electrode can also be configured to contain at least an electrode active material and an electrode electrolyte. In this case, a solid electrolyte described later can be used as the electrode electrolyte.

(Lithium ion conductive solid electrolyte)
The lithium ion conductive solid electrolyte used in the present invention is not particularly limited as long as it has lithium ion conductivity and is in a solid form at room temperature (15 ° C. to 25 ° C.). Specifically, as the lithium ion conductive solid electrolyte used in the present invention, a solid oxide electrolyte, a solid sulfide electrolyte, or the like can be used.
Specifically, as the solid oxide electrolyte, LiPON (lithium phosphate oxynitride), Li _1.3 Al _0.3 Ti _0.7 (PO ₄ ) ₃ , La _0.51 Li _0.34 TiO _{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 etc. be able to.
The solid sulfide electrolyte, _{specifically, 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, 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.

(Other components)
As another component, a separator can be used for an all-solid lithium secondary battery. The separator is oriented between the positive electrode current collector and the negative electrode current collector described above, and usually has a function of preventing contact between the positive electrode active material layer and the negative electrode active material layer and holding the solid electrolyte. Have. Furthermore, examples of the material for the separator include resins such as polyethylene (PE), polypropylene (PP), polyester, cellulose, and polyamide. Among them, polyethylene and polypropylene are preferable. The separator may have a single layer structure or a multilayer structure. Examples of the separator having a multilayer structure include a separator having a two-layer structure of PE / PP and a separator having a three-layer structure of PP / PE / PP. Furthermore, in the present invention, the separator may be a nonwoven fabric such as a resin nonwoven fabric or a glass fiber nonwoven fabric. Moreover, the film thickness of the said separator is not specifically limited, It is the same as the film thickness of the separator used for a general lithium secondary battery.

  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 unit including at least a positive electrode, a negative electrode, and a solid electrolyte interposed between the positive electrode and the negative electrode is included in the solid battery unit according to the present invention.

2. Solid Battery Module The solid battery module of the present invention includes two or more solid battery units each including at least a positive electrode, a negative electrode, and a solid electrolyte interposed between the positive electrode and the negative electrode, and the solid battery unit includes a housing. A solid battery module housed in a body, comprising two or more solid battery units electrically connected in series by a current collector and having terminals at both ends, wherein the solid battery is at least Folded at one current collector portion, both of the two terminals protrude from one side of the casing, and a first insulating layer is disposed inside a portion where the solid battery is folded. To do.

The solid battery module according to the present invention is obtained by the manufacturing method according to the present invention described above.
FIG. 7 is a schematic cross-sectional view and a side view of a typical example of the solid battery module according to the present invention. As shown in the schematic cross-sectional view of FIG. 7A, this typical example includes a solid battery in which solid battery units 1 and current collectors 2 are alternately connected and have terminals at both ends. Further, since the solid battery is bent once and the entire solid battery is in a U shape, the two terminals 6 protrude from one side of the housing 7. With such a configuration, a plurality of solid battery units are connected by a current collector to form a solid battery, and the protruding positions of the terminals of the solid battery are aligned efficiently on one side with respect to the housing. Since it is housed, both the problems of volume saving and high capacity / high output can be solved.
The solid battery module according to the present invention is not necessarily limited to the typical example shown in FIG. 7 as long as it has the features of the present invention.

  In the solid state battery module of the present invention, in the solid state battery, it is preferable that an insulating layer (corresponding to the second insulating layer described in the above-described manufacturing method) is disposed without a gap on one side or both sides of the current collector. With such a configuration, the solid battery module of the present invention prevents the solid battery units from contacting each other by the second insulating layer, and the insulating layer is filled with no gap between the solid battery and the casing. The position shift of the solid battery unit or the current collector can be prevented.

DESCRIPTION OF SYMBOLS 1 Solid battery unit 2 Current collector 3a Current collector thickness 3b Solid battery unit thickness 3c, 3d Second insulation layer thickness 4 Second insulation layer 5 First insulation layer 6 Terminal 7 Housing 8 Arrow indicating the pressing direction 11 Lithium ion conductive solid electrolyte 12 Positive electrode active material layer 13 Negative electrode active material layer 14 Positive electrode current collector 15 Negative electrode current collector 16 Positive electrode 17 Negative electrode 100 All solid lithium secondary battery

Claims (4)

Production of a solid battery module comprising at least two solid battery units each including at least a positive electrode, a negative electrode, and a solid electrolyte interposed between the positive electrode and the negative electrode, and the solid battery unit being housed in a housing A method,
Producing a solid battery in which two or more solid battery units are electrically connected in series by a current collector;
Bending the solid state battery;
Attaching terminals to both ends of the solid state battery; and
A method of manufacturing a solid battery module, comprising the step of storing the bent solid battery in the housing.   The method for manufacturing a solid battery module according to claim 1, further comprising a step of forming an insulating layer on one side or both sides of the current collector in the solid battery. A solid battery module comprising at least two solid battery units each including at least a positive electrode, a negative electrode, and a solid electrolyte interposed between the positive electrode and the negative electrode, and the solid battery unit is housed in a casing. And
Two or more solid battery units are electrically connected in series by a current collector, and comprise a solid battery having terminals at both ends,
The solid state battery is folded at at least one current collector portion;
Both of the two terminals protrude from one side of the housing,
A solid battery module, wherein a first insulating layer is arranged inside a portion where the solid battery is folded.   The solid battery module according to claim 3, wherein in the solid battery, a second insulating layer is disposed without a gap on one or both surfaces of the current collector.

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