US 12,706,330 B2Granted

Power storage device and electronic device

AssigneeSemiconductor Energy Laboratory Co., Ltd.

InventorsKei Takahashi, Kazuki Tanemura

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Abstract

A power storage device or the like with low power consumption is provided. Alternatively, a power storage device or the like with high integration is provided. A first battery cell includes a first electrode over a first substrate, a positive electrode active material layer over the first electrode, an electrolyte layer over the positive electrode active material layer, a negative electrode active material layer over the electrolyte layer, and a second electrode over the negative electrode active material layer. The comparison circuit includes a first input terminal, a second input terminal, an output terminal, and a first transistor. The first transistor includes an oxide semiconductor over the first substrate, a first insulator over the oxide semiconductor, and a gate electrode over the first insulator. The first electrode is electrically connected to the gate of the first transistor and the first input terminal. The comparison circuit has a function of outputting a first signal in response to a result of comparison between a potential of the first electrode and a desired reference potential from the output terminal to the control circuit. The control circuit has a function of controlling charging of the first battery cell in accordance with the first signal.

Claims16

Dependent claims

A power storage device comprising a first substrate, a first battery cell, a comparison circuit, and a control circuit,

wherein the comparison circuit comprises a first input terminal, a second input terminal, an output terminal, and a first transistor,
wherein the first transistor comprises an oxide semiconductor over the first substrate, a first insulator over the oxide semiconductor, and a gate electrode over the first insulator,
wherein a second insulator is provided over the gate electrode of the first transistor,
wherein the first battery cell comprises a first electrode over the second insulator, a positive electrode active material layer over the first electrode, an electrolyte layer over the positive electrode active material layer, a negative electrode active material layer over the electrolyte layer, and a second electrode over the negative electrode active material layer,
wherein the first electrode is electrically connected to the gate electrode of the first transistor and the first input terminal,
wherein a third electrode is provided over the second insulator and electrically connected to one of a source electrode and a drain electrode of the first transistor,
wherein the first electrode and the third electrode comprise a same material,
wherein the comparison circuit is configured to output a first signal in response to a result of comparison between a potential of the first electrode and a desired reference potential from the output terminal to the control circuit, and
wherein the control circuit is configured to control charging of the first battery cell in accordance with the first signal.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/906,443Filed 17 Mar 2021
Priority: JP 2020-05784327 Mar 2020
Published: US 2023/0144022 A111 May 2023
Granted: 11 Aug 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification18 codes

H01M 10/46
Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells: accumulators structurally combined with charging…
H01M 4/48
Selection of substances as active materials, active masses, active liquids: of inorganic oxides or hydroxides
H01M 4/485
Of inorganic oxides or hydroxides: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
H01M 4/505
Of manganese: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy