# US 12,224,435 B2 · Storage battery

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- Number: US 12,224,435 B2
- Document ID: US12224435B2
- Status: Granted
- Kind: B2
- Application number: 17/580,529
- Filed: 2022-01-20
- Published: 2022-05-12
- Granted: 2025-02-11
- Earliest claimed: 2020-07-22
- Assignees: Kabushiki Kaisha Toshiba
- Applicants: Kabushiki Kaisha Toshiba
- Inventors: Ryosuke Yagi; Yasuhiro Harada; Norio Takami; Tetsuya Sasakawa; Norihiro Yoshinaga; Yuta Kanai
- Web page: https://patentgrep.com/patent/US12224435B2

## CPC

- H01M 4/485: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence)
- H01M 50/51: Connection only in series
- H01M 4/583: Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/587: for inserting or intercalating light metals
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 50/267: having means for adapting to batteries or cells of different types or different sizes
- H01M 2004/027: {Negative electrodes}
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## 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%.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

The storage battery according to claim 1, wherein
each of the plurality of first cells contains monoclinic niobium titanium composite oxide as the negative electrode active material,
each of the plurality of second cells contains graphite as the negative electrode active material, and
the first battery module and the second battery module satisfy the following formulas (3) and (4):
M
×
1.88
<
N
×
3.47
;
and
(
3
)
M
×
2.68
>
N
×
4.05
.
(
4
)