US 12,224,435 B2Granted

Storage battery

AssigneeKabushiki Kaisha Toshiba

InventorsRyosuke Yagi, Yasuhiro Harada, Norio Takami, Tetsuya Sasakawa, Norihiro Yoshinaga, Yuta Kanai

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Abstract

According to a storage battery of an embodiment includes a first battery module and a second battery module connected in parallel with the first battery module. The number of first cells connected in series in the first battery module is M, and the number of second cells connected in series in the second battery module is N. When an open circuit voltage at SOC=X % of the first cells and the second cells are Va1 (X) and Va2 (X), respectively, the voltages of the battery modules are M×Va1 (X)<N×Va2 (X) in the range where the SOC of the cell is 0% to 30%, and M×Va1 (X)>N×Va2 (X) in the range where the SOC of the cell is 70% to 100%.

Claims2

Dependent claims

A storage battery comprising:

a first battery module including a plurality of first cells connected in series, each of the plurality of first cells containing titanium composite oxide as a negative electrode active material;
and
a second battery module including a plurality of second cells connected in series, each of the plurality of second cells containing a carbonaceous material as a negative electrode active material, the second battery module being connected in parallel with the first battery module,
wherein
a voltage of the storage battery is changeable between a lower limit voltage value and an upper limit voltage value,
at the lower limit voltage value of the storage battery, an SOC of the second battery module is lower than an SOC of the first battery module, and a resistance of the second battery module is higher than a resistance of the first battery module,
at the upper limit voltage value of the storage battery, the SOC of the second battery module is higher than the SOC of the first battery module, and the resistance of the second battery module is higher than the resistance of the first battery module, and
the first battery module and the second battery module satisfy the following formulas (1) and (2):
M
×
Va
⁢
⁢
1
⁢
(
X
)
<
N
×
Va
⁢
⁢
2
⁢
(
X
)
⁢
(
0
≦
X
≦
30
)
;
and
(
1
)
M
×
Va
⁢
⁢
1
⁢
(
X
)
>
N
×
Va
⁢
⁢
2
⁢
(
X
)
⁢
(
70
≦
X
≦
100
)
,
(
2
)
wherein Va1 (X) represents an open circuit voltage at SOC=X % of each of the plurality of first cells, Va2 (X) represents an open circuit voltage at SOC=X % of each of the plurality of second cells, M represents the number of the plurality of first cells connected in series in the first battery module, and N represents the number of the plurality of second cells connected in series in the second battery module.

73 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/580,529Filed 20 Jan 2022 · continuation
Priority: JP 2020-12539922 Jul 2020
Published: US 2022/0149363 A112 May 2022
Granted: 11 Feb 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

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 50/51
Characterised by the type of connection, e.g. mixed connections: connection only in series
H01M 4/583
Of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures,…:…
H01M 4/587
Carbonaceous material, e.g. graphite-intercalation compounds or CFx: for inserting or intercalating light metals

Family

PCT/JP2021/003748Parent of this continuation · filed 2 Feb 2021
US 2022/0149363 A1Pre-grant publication · published 12 May 2022
US 12,224,435 B2This patent

From the US filing history. Foreign family members aren’t listed.

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