Power storage system with integrally formed voltage detecting field effect transistor and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-11545700-B2
Application number	US-202016750169-A
Country	US
Kind code	B2
Filing date	Jan 23, 2020
Priority date	Jan 25, 2019
Publication date	Jan 3, 2023
Grant date	Jan 3, 2023

Abstract

A power storage system includes a power storage element; and a voltage detecting unit configured to detect an output voltage of the power storage element. The power storage element and the voltage detecting unit are formed by integrally forming structural materials of the power storage element and the voltage detecting unit on the same base material, without any point bonding portions formed by solder mounting.

First claim

What is claimed is:

1. A power storage system comprising:
a power storage element that includes
a first electrode mixture layer,
a first conductive layer that contacts the first electrode mixture layer,
a second electrode mixture layer, and
a second conductive layer that contacts the second electrode mixture layer;

a non-aqueous electrolyte layer; and
a voltage detecting unit configured to detect an output voltage of the power storage element, wherein
the power storage element and the voltage detecting unit are formed by integrally forming structural materials of the power storage element and the voltage detecting unit on a same base material, without any point bonding portions formed by solder mounting,
the first electrode mixture layer and the second electrode mixture layer are stacked in a vertical direction with respect to the plane of the base material,
the non-aqueous electrolyte layer includes
a first portion that is disposed along at least a part of a peripheral edge of the first electrode mixture layer, the first portion contacting the base material, the first conductive layer, and the second conductive layer; and
a second portion that is disposed along at least a part of a peripheral edge of the second electrode mixture layer,

the second conductive layer contacts the first portion and the second portion of the non-aqueous electrolyte layer on an opposite side of the non-aqueous electrolyte layer from the peripheral edges of the first electrode mixture layer and the second electrode mixture layer, and
at least one of the first electrode mixture layer or the second electrode mixture layer is formed of a plurality of layers so that the power storage element has a multilayer laminate structure.

2. A power storage system comprising:
a power storage element; and
a voltage detecting unit configured to detect an output voltage of the power storage element, wherein
the power storage element is a non-aqueous electrolyte secondary battery,
the non-aqueous electrolyte secondary battery has a laminated structure including:
a first electrically conductive layer formed on a base material;
a first electrode mixture layer formed on the first electrically conductive layer;
a non-aqueous electrolyte layer formed on the first electrode mixture layer;
a second electrode mixture layer formed on the non-aqueous electrolyte layer; and
a second electrically conductive layer formed on the second electrode mixture layer,

the laminated structure is covered by a sealing layer,
the voltage detecting unit includes:
a resistive element; and
a field effect transistor,

the resistive element and the field effect transistor are integrally formed on the base material, without any point bonding portions formed by solder mounting,
the first electrode mixture layer and the second electrode mixture layer are stacked in a vertical direction with respect to the plane of the base material,
the non-aqueous electrolyte layer includes
a first portion that is disposed along at least a part of a peripheral edge of the first electrode mixture layer, the first portion contacting the base material, and the first electrically conductive layer; and
a second portion that is disposed along at least a part of a peripheral edge of the second electrode mixture layer,

the second electrically conductive layer contacts the first portion and the second portion of the non-aqueous electrolyte layer on an opposite side of the non-aqueous electrolyte layer from the peripheral edges of the first electrode mixture layer and the second electrode mixture layer, and
at least one of the first electrode mixture layer or the second electrode mixture layer is formed of a plurality of layers so that the power storage element has a multilayer laminate structure.

3. The power storage system according to claim 2 , wherein
a lamination portion of the first electrically conductive layer and the first electrode mixture layer and a lamination portion of the second electrode mixture layer and the second electrically conductive layer are disposed to face each other with a predetermined space maintained between the lamination portions and with the non-aqueous electrolyte layer interposed between the lamination portions.

4. The power storage system according to claim 2 , wherein
the field effect transistor includes a first field effect transistor and a second field effect transistor, wherein
the first field effect transistor and the second field effect transistor are coupled in series between the output voltage of the power storage element and a ground reference voltage, and
the first field effect transistor and the second field effect transistor generate a reference voltage to be used as a reference when detecting the output voltage of the power storage element.

5. The power storage system according to claim 4 , wherein the voltage detecting unit detects that the output voltage of the power storage element is outside a predetermined range by using the reference voltage.

6. The power storage system according to claim 1 , wherein
the voltage detecting unit is formed on the power storage element,
the power storage element including an upper surface disposed on an opposite side of the power storage element facing away from the base material, and
a projection area of the voltage detecting unit projected on the upper surface of the power storage element is smaller than an area of the upper surface of the power storage element.

7. The power storage system according to claim 1 , wherein the voltage detecting unit and the power storage element are formed on opposite sides of the base material.

8. A method of manufacturing a power storage system, the power storage system including:
a power storage element that includes
a first electrode mixture layer,
a first conductive layer that contacts the first electrode mixture layer,
a second electrode mixture layer, and
a second conductive layer that contacts the second electrode mixture layer;

a non-aqueous electrolyte layer; and
a voltage detecting unit configured to detect an output voltage of the power storage element, the method comprising:
forming the power storage element and the voltage detecting unit by integrally forming structural materials of the power storage element and the voltage detecting unit, by a coating process, on a same base material, without any point bonding portions formed by solder mounting,
stacking the first electrode mixture layer and the second electrode mixture layer in a vertical direction with respect to the plane of the base material, and
disposing
a first portion of the non-aqueous electrolyte layer along at least a part of a peripheral edge of the first electrode mixture layer, the first portion contacting the base material, and the first electrically conductive layer; and
a second portion of the non-aqueous electrolyte layer along at least a part of a peripheral edge of the second electrode mixture layer, wherein
the second electrically conductive layer contacts the first portion and the second portion of the non-aqueous electrolyte layer on an opposite side of the non-aqueous electrolyte layer from the peripheral edges of the first electrode mixture layer and the second electrode mixture layer, and
at least one of the first electrode mixture layer or the second electrode mixture layer is formed of a plurality of layers so that the power storage element has a multilayer laminate structure.

9. The power storage system according to claim 1 , wherein the voltage detecting unit further includes an organic semiconductor layer.

10. The power storage system according to claim 1 , wherein the base material has a planar shape.

Assignees

• Kuriyama Hiromichi
• Takai Masami
• Nakajima Satoshi
• Suzuki Eiko
• Ushirogochi Toru
• Ricoh Co Ltd

Inventors

• Kuriyama Hiromichi
• Takai Masami
• Nakajima Satoshi
• Suzuki Eiko
• Ushirogochi Toru

Classifications

• H01M10/0585 Primary

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M10/44

  Methods for charging or discharging (circuits for charging H02J7/00) · CPC title

• H01M10/4257

  Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries · CPC title

• H01M10/0565

  Polymeric materials, e.g. gel-type or solid-type · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title