Box body applied to battery, battery assembly, electric apparatus, and method and device for preparing battery assembly

A box body comprising:

• a carrying plate;
• a one-way gravity valve disposed at the carrying plate, wherein:
• the one-way gravity valve is configured:
• to be closed in response to a gravity of liquid in the box body being less than a threshold, and
• to be open in response to the gravity of the liquid in the box body reaching the threshold;
• and
• the one-way gravity valve comprises:
• a liquid discharge member provided with a through hole and configured to discharge the liquid through the through hole in response to the gravity of the liquid in the box body reaching the threshold;
• and
• a bottom plate arranged below and connected to the carrying plate;
• wherein:
• the carrying plate is configured to carry a battery comprising a battery cell, the battery cell comprising:
• a housing body;
• an electrode assembly disposed in the housing body;
• and
• an end cover assembly comprising:
• an end cover plate connected to the housing body to form a housing of the battery cell;
• and
• an electrode terminal coupled to the electrode assembly;
• the carrying plate is configured to be between a bottom of the housing body of the battery cell and the bottom plate;
• and
• a water storage chamber communicating with the through hole is formed between the carrying plate and the bottom plate.