Busbar diagnosis device, battery pack, energy storage system, and busbar diagnosis method
AssigneeLG Energy Solution, Ltd.
InventorsYong-Min Jo, Nak-Choon Lee, Mu-Yeon Lee, Ju-Yeon Jeong
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Abstract
A busbar diagnosis apparatus includes a plurality of voltage sensing pins, a battery monitoring circuit, a voltage sensing channel, a bypass unit and a control circuit to diagnose s busbar. A voltage of each of a plurality of battery cells of a first battery module and a plurality of battery cells of a second battery module is detected using a potential difference of every two adjacent voltage sensing pins, and the busbar is diagnosed based on a voltage history of each of the plurality of battery cells.
Claims13
A busbar diagnosis apparatus for a battery pack including a busbar connected between a positive terminal of a first battery module including a plurality of battery cells connected in series and a negative terminal of a second battery module including a plurality of battery cells connected in series, the busbar diagnosis apparatus comprising:
- a battery monitoring circuit including a plurality of voltage sensing pins, and the battery monitoring circuit is configured to detect a voltage of each of the plurality of battery cells of the first battery module and the plurality of battery cells of the second battery module using a potential difference of every two adjacent voltage sensing pins;
- a voltage sensing channel including a plurality of voltage sensing lines connecting a positive electrode and a negative electrode of each of the plurality of battery cells of the first battery module and the plurality of battery cells of the second battery module to the plurality of voltage sensing pins;
- a bypass unit connected to the busbar through a first voltage sensing pin and a second voltage sensing pin among the plurality of voltage sensing pins, wherein the first voltage sensing pin is connected to the positive electrode of the battery cell disposed on a most upstream of the first battery module through one of the plurality of voltage sensing lines and the second voltage sensing pin is connected to the negative electrode of the battery cell disposed on a most downstream of the second battery module through the other voltage sensing line among the plurality of voltage sensing lines;
- and
- a control circuit configured to:
- when it is determined that the battery pack is kept in a discharge mode for a set time or more,
- determine an average voltage of the plurality of battery cells of the first battery module and the plurality of battery cells of the second battery module;
- increase a diagnosis count by a predetermined value when both a difference between the voltage of the battery cell disposed on the most upstream of the first battery module and the average voltage and a difference between the voltage of the battery cell disposed on the most downstream of the second battery module and the average voltage are larger than a reference voltage difference, and
- set a diagnosis flag indicating that the busbar is in a fault condition when the increased diagnosis count is equal to or larger than a reference count.
A busbar diagnosis apparatus for a battery pack including a busbar connected between a positive terminal of a first battery module including a plurality of battery cells connected in series and a negative terminal of a second battery module including a plurality of battery cells connected in series, the busbar diagnosis apparatus comprising:
- a battery monitoring circuit including a plurality of voltage sensing pins, and the battery monitoring circuit is configured to detect a voltage of each of the plurality of battery cells of the first battery module and the plurality of battery cells of the second battery module using a potential difference of every two adjacent voltage sensing pins;
- a voltage sensing channel including a plurality of voltage sensing lines connecting a positive electrode and a negative electrode of each of the plurality of battery cells of the first battery module and the plurality of battery cells of the second battery module to the plurality of voltage sensing pins;
- a bypass unit connected to the busbar through a first voltage sensing pin and a second voltage sensing pin among the plurality of voltage sensing pins, wherein the first voltage sensing pin is connected to the positive electrode of the battery cell disposed on a most upstream of the first battery module through one of the plurality of voltage sensing lines and the second voltage sensing pin is connected to the negative electrode of the battery cell disposed on a most downstream of the second battery module through the other voltage sensing line among the plurality of voltage sensing lines;
- and
- a control circuit configured to:
- when it is determined that the battery pack is switched from a rest mode or a charge mode to a discharge mode,
- determine a voltage drop of the battery cell disposed on the most upstream of the first battery module, a voltage drop of the battery cell disposed on the most downstream of the second battery module and an average voltage drop of the plurality of battery cells of the first battery module and the plurality of battery cells of the second battery module, over a diagnosis time, and
- set a diagnosis flag indicating that the busbar is in a fault condition when both a difference between the voltage drop of the battery cell disposed on the most upstream of the first battery module and the average voltage drop and a difference between the voltage drop of the battery cell disposed on the most downstream of the second battery module and the average voltage drop are larger than a reference voltage drop.
Dependencies are inferred from the claim text.