# US 2021/0242477 A1 · Method for Start Preparation

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- Number: US 2021/0242477 A1
- Document ID: US20210242477A1
- Status: Published application
- Kind: A1
- Application number: 17/269,753
- Filed: 2019-08-14
- Published: 2021-08-05
- Earliest claimed: 2018-08-21
- Assignees: Daimler AG
- Applicants: Daimler AG
- Inventors: Pere Antoni PASTOR NIGORRA; Sven SCHMALZRIEDT; Hans-Joerg HEIDRICH
- Web page: https://patentgrep.com/patent/US20210242477A1

## CPC

- H01M 8/04253: {Means for solving freezing problems}
- H01M 8/04302: applied during start-up
- H01M 8/04723: {of the coolant}
- H01M 8/04303: applied during shut-down
- H01M 8/0432: Temperature; Ambient temperature
- H01M 8/04358: {of the coolant}
- H01M 2250/20: Fuel cells in motive systems, e.g. vehicle, ship, plane
- Y02E 60/50: Fuel cells
- Y02T 90/40: Application of hydrogen technology to transportation, e.g. using fuel cells
- 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
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A method for preparing a fuel cell system in a vehicle for starting, for which purpose a starting preparation routine is carried out after the vehicle has been shut down depending on a temperature limit value. In the method, in the event that the fuel cell had not reached its normal operating temperature during the previous operation and a temperature falls below the predetermined temperature limit value, the fuel cell system is operated until it has reached its normal operating temperature and after which the starting preparation routine is subsequently carried out.

## Claims

### Claim at position 1

-5. (canceled)

### Claim 6

A method for preparing a fuel cell system in a vehicle for starting, comprising the steps of:
when the fuel cell system did not reach a normal operating temperature of the fuel cell system during a previous operation and a current temperature falls below a predetermined temperature limit value, operating the fuel cell system until the fuel cell system reaches the normal operating temperature and subsequently performing a starting preparation routine.

### Claim 7 (depends on 6)

The method according to claim 6, wherein the starting preparation routine is performed only after the fuel cell system has cooled down to the predetermined temperature limit value after reaching the normal operating temperature.

### Claim 8 (depends on 6)

The method according to claim 6, wherein the normal operating temperature is 60° C. to 70° C.

### Claim 9 (depends on 6)

The method according to claim 6, wherein the predetermined temperature limit value is 0° C. to 10° C.

### Claim 10 (depends on 6)

The method according to claim 6, wherein the current temperature is measured in an interior of the fuel cell system.

### Claim 11 (depends on 10)

The method according to claim 10, wherein the current temperature is measured in a region of a fuel cell of the fuel cell system and/or in a region of a coolant for the fuel cell.