# US 10,479,179 B2 · Method for operating a rechargeable battery cell and battery control device

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- Number: US 10,479,179 B2
- Document ID: US10479179B2
- Status: Granted
- Kind: B2
- Application number: 15/574,605
- Filed: 2016-04-28
- Published: 2018-06-07
- Granted: 2019-11-19
- Earliest claimed: 2015-05-19
- Assignees: Robert Bosch GmbH
- Applicants: Robert Bosch GmbH
- Inventors: Markus Kohlberger
- Web page: https://patentgrep.com/patent/US10479179B2

## CPC

- H02J 7/65: against overtemperature
- B60K 6/28: characterised by the electric energy storing means, e.g. batteries or capacitors
- H01M 10/44: Methods for charging or discharging (circuits for charging H02J7/00)
- H01M 10/482: {for several batteries or cells simultaneously or sequentially}
- H02J 7/04: Regulation of charging current or voltage
- H02J 7/96: in response to battery voltage
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H02J 7/61: against overcharge
- Y02E 60/10: Energy storage using batteries
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- 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

The invention relates to a method for operating a rechargeable battery cell: wherein —a first measurement (101) of a first voltage of the battery cell is carried out, —a first comparison (102) of the first voltage with a first limit voltage is carried out, —a charging process (104) of the battery cell is carried out if the first voltage is less than the first limit voltage, —a second measurement (106) of a second voltage of the battery cell is carried out, —a second comparison (107) of the second voltage with a second limit voltage is carried out, —a discharge process (109) of the battery cell is carried out if the second voltage is greater than the second limit voltage, wherein the first limit voltage is greater than the second limit voltage. The invention also relates to a battery control device which is equipped to carry out the method according to the invention.

## Claims

### Claim 1

A method for operating a rechargeable battery cell (2), the method comprising:
measuring (101) a first voltage (U1) of the battery cell (2),
comparing (102) the first voltage (U1) with a first limit voltage (Umax1),
charging (104) the battery cell (2) if the first voltage (U1) is less than the first limit voltage (Umax1),
measuring (106) a second voltage (U2) of the battery cell (2),
comparing (107) the second voltage (U2) with a second limit voltage (Umax2),
discharging (109) the battery cell (2) if the second voltage (U2) is greater than the second limit voltage (Umax2),
wherein the first limit voltage (Umax1) is greater than the second limit voltage (Umax2).

### Claim 2 (depends on 1)

The method according to claim 1, wherein
a termination (103) of a charging of the battery cell (2) is carried out if the first voltage (U1) is greater than or equal to the first limit value (Umax1).

### Claim 3 (depends on 1)

The method according to claim 1, wherein
a termination (108) of a discharge of the battery cell (2) is carried out if the second voltage (U2) is less than or equal the second limit voltage (Umax2).

### Claim 4 (depends on 1)

The method according to claim 1, wherein
a waiting period (105) is provided between the charging process (104) and the second measurement (106) of the second voltage (U2).

### Claim 5 (depends on 1)

The method according to claim 1, wherein
the first limit voltage (Umax1) is between 4.3 volts and 4.35 volts.

### Claim 6 (depends on 1)

The method according to claim 1, wherein
the second limit voltage (Umax2) is between 4.15 volts and 4.2 volts.

### Claim 7 (depends on 1)

The method according to claim 1, wherein
the charging process (104) takes place by means of recuperation.

### Claim 8 (depends on 1)

A battery control device (50), equipped to carry out the method according to claim 1.

### Claim 9 (depends on 8)

A use of the battery control device (50) according to claim 8 in an electric vehicle (EV), in a hybrid vehicle (HEV) or in a plug-in hybrid vehicle (PHEV).