A battery system of a vehicle, comprising an energy storage apparatus and a direct current (DC) charging and discharging interface that are connected to each other, wherein the energy storage apparatus comprises at least a first battery pack and a second battery pack , and an inter-battery switch is disposed between adjacent battery packs; and a first electrode of the DC charging and discharging interface is separately connected to a first electrode of the energy storage apparatus and one terminal of the inter-battery switch, and a second electrode of the DC charging and discharging interface is separately connected to a second electrode of the energy storage apparatus and another terminal of the inter-battery switch; characterized in that the inter-battery switch comprises a first inter-battery switch and a second inter-battery switch , and both the first inter-battery switch and the second inter-battery switch are single-pole double-throw (SPDT) switches; and an incoming line terminal of the first inter-battery switch is connected to a first electrode of the first battery pack , a first outgoing line terminal of the first inter-battery switch is connected to the first electrode of the DC charging and discharging interface , and a second outgoing line terminal of the first inter-battery switch is connected to a first outgoing line terminal of the second inter-battery switch ; and a second outgoing line terminal of the second inter-battery switch is connected to the second electrode of the DC charging and discharging interface , and an incoming line terminal of the second inter-battery switch is connected to a second electrode of the second battery pack . the energy storage apparatus comprises at least a first battery pack and a second battery pack , and an inter-battery switch is disposed between adjacent battery packs; and a first electrode of the DC charging and discharging interface is separately connected to a first electrode of the energy storage apparatus and one terminal of the inter-battery switch, and a second electrode of the DC charging and discharging interface is separately connected to a second electrode of the energy storage apparatus and another terminal of the inter-battery switch; characterized in that the inter-battery switch comprises a first inter-battery switch and a second inter-battery switch , and both the first inter-battery switch and the second inter-battery switch are single-pole double-throw (SPDT) switches; and an incoming line terminal of the first inter-battery switch is connected to a first electrode of the first battery pack , a first outgoing line terminal of the first inter-battery switch is connected to the first electrode of the DC charging and discharging interface , and a second outgoing line terminal of the first inter-battery switch is connected to a first outgoing line terminal of the second inter-battery switch ; and a second outgoing line terminal of the second inter-battery switch is connected to the second electrode of the DC charging and discharging interface , and an incoming line terminal of the second inter-battery switch is connected to a second electrode of the second battery pack . <EOS>