Method for diagnosis of a temperature control means of a battery pack
A method for diagnosis of a temperature control means ( 30 ) of a battery pack ( 10 ) that comprises a plurality of battery cells ( 20 ) and a plurality of temperature sensors for measuring temperatures of the individual battery cells ( 20 ), the battery cells ( 20 ) being arranged side by side in the battery pack ( 10 ), in a longitudinal direction ( 12 ) of the battery pack ( 10 ), and mechanically connected to each another, and the battery cells ( 20 ) being arranged on the temperature control means ( 30 ) and mechanically and thermally connected to it. A battery management system, and/or a battery pack ( 10 ) may be configured to execute the method. A vehicle may be fitted with a battery pack that carries out the method.
1. A method for diagnosis of a temperature control means ( 30 ) of a battery pack ( 10 ) that comprises a plurality of battery cells ( 20 ) and a plurality of temperature sensors for measuring temperatures of the individual battery cells ( 20 ),
the battery cells ( 20 ) being arranged side by side in the battery pack ( 10 ), in a longitudinal direction ( 12 ) of the battery pack ( 10 ), and connected to each other, the battery cells ( 20 ) being arranged on the temperature control means ( 30 ) and connected to the temperature control means ( 30 ), wherein the connection includes a thermal connection,
the method comprising the following steps:
determining a reference temperature distribution of the battery pack ( 10 ) in the longitudinal direction ( 12 ) of the battery pack ( 10 );
measuring the temperatures of the individual battery cells ( 20 ) during operation of the battery pack ( 10 ) when the temperature control means ( 30 ) is switched on, and forming an actual temperature distribution of the battery pack ( 10 ), in the longitudinal direction ( 12 ) of the battery pack ( 10 ), on the basis of the measured temperatures of the individual battery cells ( 20 );
comparing the actual temperature distribution with the reference temperature distribution and forming a profile of a difference between the actual and the reference temperature distribution; and
identifying an ineffective temperature control state of the temperature control means ( 30 ) based on the difference between the actual and the reference temperature distribution exceeding a predefined threshold value.
2. The method according to claim 1 , further comprising:
identifying one or more battery cells ( 20 ) that are temperature-controlled in an ineffective manner by the temperature control means ( 30 ), on the basis of the profile of the difference between the actual and the reference temperature distribution.
3. The method according to claim 1 , wherein the reference temperature distribution is set by setting a temperature control performance of the temperature control means ( 30 ) and/or through design of a structure of the temperature control means ( 30 ).
4. The method according to claim 1 , wherein the battery cells ( 20 ) are mechanically and thermally connected to the temperature control means ( 30 ) in a materially bonded manner.
5. The method according to claim 1 , wherein the battery cells ( 20 ) are each monitored by specifically one temperature sensor.
6. The method according to claim 1 , wherein the temperature control means ( 30 ) has a channel-type structure for conveying a temperature control medium.
7. The method according to claim 1 , wherein the temperature control means ( 30 ) is realized as a Peltier element.
8. A battery management system for diagnosis of a temperature control means ( 30 ), the batter management system comprising:
a battery pack ( 10 ) having a plurality of battery cells ( 20 ) and a plurality of temperature sensors for measuring temperatures of the individual battery cells ( 20 ),
the battery cells ( 20 ) being arranged side by side in the battery pack ( 10 ), in a longitudinal direction ( 12 ) of the battery pack ( 10 ), and connected to each other, the battery cells ( 20 ) being arranged on the temperature control means ( 30 ) and connected to the temperature control means ( 30 ), wherein the connection includes a thermal connection,
the battery management system including an electronic controller programmed to
determine a reference temperature distribution of the battery pack ( 10 ) in the longitudinal direction ( 12 ) of the battery pack ( 10 );
measure the temperatures of the individual battery cells ( 20 ) during operation of the battery pack ( 10 ) when the temperature control means ( 30 ) is switched on, and forming an actual temperature distribution of the battery pack ( 10 ), in the longitudinal direction ( 12 ) of the battery pack ( 10 ), on the basis of the measured temperatures of the individual battery cells ( 20 );
compare the actual temperature distribution with the reference temperature distribution and forming a profile of a difference between the actual and the reference temperature distribution; and
identify an ineffective temperature control state of the temperature control means ( 30 ) based on the difference between the actual and the reference temperature distribution exceeding a predefined threshold value.
9. A battery pack ( 10 ) for diagnosis of a temperature control means ( 30 ), comprising:
a plurality of battery cells ( 20 ), the battery cells ( 20 ) being arranged side by side in the battery pack ( 10 ), in a longitudinal direction ( 12 ) of the battery pack ( 10 ), and connected to each other,
a plurality of temperature sensors for measuring temperatures of the individual battery cells ( 20 ),
the temperature control means ( 30 connected to the battery cells ( 20 ) arranged on the temperature control means ( 30 ), wherein the connection includes a thermal connection, and
a battery management system that includes an electronic controller,
the battery pack ( 10 ) configured to
determine, with the electronic controller, a reference temperature distribution of the battery pack ( 10 ) in the longitudinal direction ( 12 ) of the battery pack ( 10 );
measure, with the electronic controller, the temperatures of the individual battery cells ( 20 ) during operation of the battery pack ( 10 ) when the temperature control means ( 30 ) is switched on, and forming an actual temperature distribution of the battery pack ( 10 ), in the longitudinal direction ( 12 ) of the battery pack ( 10 ), on the basis of the measured temperatures of the individual battery cells ( 20 );
compare, with the electronic controller, the actual temperature distribution with the reference temperature distribution and forming a profile of a difference between the actual and the reference temperature distribution; and
identify, with the electronic controller, an ineffective temperature control state of the temperature control means ( 30 ) based on the difference between the actual and the reference temperature distribution exceeding a predefined threshold value.
10. A vehicle, which comprises at least one battery pack ( 10 ) according to claim 9 .