Underwater sealed battery and underwater robot

An underwater sealed battery, comprising a battery cover and a battery body,

• wherein the battery cover is detachably arranged at a top of the battery body to seal the battery body, and comprises:
• a sealing portion comprising:
• a base of the battery sealing cover;
• a detachable rim seal of the base of the battery sealing cover, an upper surface of the detachable rim seal of the base of the battery sealing cover being fixedly connected to a bottom of the base of the battery sealing cover by ultrasonic welding, and a ring groove being formed between a periphery of the detachable rim seal of the base of the battery sealing cover and a periphery of the bottom of the base of the battery sealing cover;
• and
• a sealing ring, disposed in the ring groove;
• and
• a fixing part of the sealing portion, being detachably connected to the base of the battery sealing cover and detachably connected to the battery body, and the sealing portion being received between the fixing part of the sealing portion and the battery body in a case where the fixing part of the sealing portion is connected to the battery body;
• the battery body comprises:
• a battery housing, a groove being formed in a top of the battery housing, and the groove receiving a bottom of the sealing portion and fitting the sealing ring.