Battery management method, battery management device and battery pack performing the same

A battery pack, comprising:

• a plurality of battery modules connected in series with each other;
• and
• a detection device detecting state information of battery cells included in the plurality of battery modules;
• and
• a control device:
• entering a replacement mode and performing balancing of the plurality of battery modules if at least one battery module among the plurality of battery modules is replaced,
• activating a first protection function performing a protection operation according to the state imbalance in each battery module while operating in the replacement mode,
• detecting an imbalance state of cell voltage or state of charge for each of the plurality of battery modules based on the state information if the first protection function is activated, and
• executing the protection operation if a battery module in the imbalance state satisfying a predetermined first condition is detected among the plurality of battery modules.

A battery management method for a battery pack including a plurality of battery modules, comprising:

• switching to a replacement mode as replacement of the battery module is detected;
• performing balancing of the plurality of battery modules while allowing only one of charge and discharge while operating in the replacement mode;
• and
• performing a first protection function including executing a protection operation according to a state imbalance in each battery module while operating in the replacement mode, the performing of the first protection function including:
• obtaining a first imbalance state of cell voltage or state of charge for each of the plurality of battery modules;
• and
• executing the protection operation if a battery module in the first imbalance state satisfies a predetermined first condition among the plurality of battery modules.