Battery group with at least two batteries and at least one electrical group conductor, wherein each of the batteries comprises a battery housing, a first electrical battery pole, a second electrical battery pole, a battery inflow and a battery outflow for a thermoregulation medium and at least one cell, wherein each of the battery housings comprises a battery base, a battery carrier and a battery cap and the battery base, the battery carrier and the battery cap enclose a battery interior in a leakproof manner, apart from the battery inflow and the battery outflow, for a thermoregulation medium, wherein the at least one cell of each of the batteries is arranged in the battery interior of the battery for circulation with a thermoregulation medium, and wherein the at least two batteries are electrically connected to each other by the at least one group conductor, characterized in that, in each of the batteries, the first battery pole is led out of the battery interior through the battery inflow and the second battery pole is led out of the battery interior through the battery outflow, and that both the battery inflow and the battery outflow are arranged in the battery cap that the battery group has a group head and the group head is arranged on the battery caps that the group head has a group inflow channel with a group inflow terminal and a group outflow channel with a group outflow terminal, that, on the one hand, each of the battery inflows and the group inflow channel and, on the other hand, each of the battery outflows and the group outflow channel are directly and connected to one another in a leakproof manner for a thermoregulation medium, and that the battery group is leakproof for a thermoregulation medium apart from the group inflow terminal and the group outflow terminal. wherein each of the batteries comprises a battery housing, a first electrical battery pole, a second electrical battery pole, a battery inflow and a battery outflow for a thermoregulation medium and at least one cell, wherein each of the battery housings comprises a battery base, a battery carrier and a battery cap and the battery base, the battery carrier and the battery cap enclose a battery interior in a leakproof manner, apart from the battery inflow and the battery outflow, for a thermoregulation medium, wherein the at least one cell of each of the batteries is arranged in the battery interior of the battery for circulation with a thermoregulation medium, and wherein the at least two batteries are electrically connected to each other by the at least one group conductor, characterized in that, in each of the batteries, the first battery pole is led out of the battery interior through the battery inflow and the second battery pole is led out of the battery interior through the battery outflow, and that both the battery inflow and the battery outflow are arranged in the battery cap that the battery group has a group head and the group head is arranged on the battery caps that the group head has a group inflow channel with a group inflow terminal and a group outflow channel with a group outflow terminal, that, on the one hand, each of the battery inflows and the group inflow channel and, on the other hand, each of the battery outflows and the group outflow channel are directly and connected to one another in a leakproof manner for a thermoregulation medium, and that the battery group is leakproof for a thermoregulation medium apart from the group inflow terminal and the group outflow terminal.