Battery connection status detection circuit and method, battery, device, and system

A battery, comprising:

• a cell pack;
• and
• a battery connection status detection circuit, the battery connection status detection circuit comprising:
• a first switch unit;
• a second switch unit;
• a discharge unit;
• a sampling unit;
• an energy storage unit;
• and
• a controller;
• a first terminal of the first switch unit is connected to a first terminal of the cell pack, and a second terminal of the first switch unit is connected to a second terminal of the cell pack after being connected in series to the energy storage unit;
• the second switch unit is connected in parallel to the energy storage unit after being connected in series to the discharge unit, the discharge unit is configured to discharge the energy storage unit;
• the sampling unit is connected in parallel to the energy storage unit, and the sampling unit is configured to send a sampling signal to the controller;
• the controller is configured to control the first switch unit and the second switch unit and is further configured to determine whether the battery is connected based on the obtained sampling signal;
• and
• a first terminal of the cell pack is connected to the first terminal of the first switch unit, and a second terminal of the cell pack is connected to the second terminal of the first switch unit by the energy storage unit.

An energy system, comprising:

• a direct current bus;
• at least one power supply unit (PSU);
• and
• at least one battery, comprising:
• a cell pack;
• and
• a battery connection status detection circuit, the battery connection status detection circuit comprising:
• a first switch unit;
• a second switch unit;
• a discharge unit;
• a sampling unit;
• an energy storage unit;
• and
• a controller;
• a first terminal of the first switch unit is connected to a first terminal of the cell pack, and a second terminal of the first switch unit is connected to a second terminal of the cell pack after being connected in series to the energy storage unit;
• the second switch unit is connected in parallel to the energy storage unit after being connected in series to the discharge unit, the discharge unit is configured to discharge the energy storage unit;
• the sampling unit is connected in parallel to the energy storage unit, and the sampling unit is configured to send a sampling signal to the controller;
• the controller is configured to control the first switch unit and the second switch unit and is further configured to determine whether the battery is connected based on the obtained sampling signal;
• the at least one battery and the at least one PSU are connected in parallel to the direct current bus of the energy system, and each power supply unit is further connected in parallel to one energy storage unit;
• and
• the power supply unit is configured to convert an alternating current provided by an external power supply into a direct current and transmit the direct current to the direct current bus.