Combiner cabinet and energy storage system

An energy storage system, comprising a combiner cabinet, the combiner cabinet comprising:

• a cabinet body, a cabinet door, and at least one electrical element assemblies, a mounting chamber being formed in the cabinet body, the cabinet door being connected to the cabinet body to cover or expose the mounting chamber, the cabinet body comprising a first side wall arranged opposite to the cabinet door, the cabinet door and the first side wall being arranged along a first direction;
• the electrical element assembly being arranged in the mounting chamber, the at least one electrical element assembly comprising a positive electrode portion and a negative electrode portion arranged at intervals, the positive electrode portion being configured to be electrically connected to a positive electrode output terminal of an external high-voltage box and electrically connected to a positive electrode of a battery pack, the negative electrode portion being configured to be electrically connected to a negative electrode output terminal of the external high-voltage box and electrically connected to a negative electrode of the battery pack, and the positive electrode portion and the negative electrode portion are arranged in the first direction.