Battery comprising first-type battery cell group and second-type battery cell group which are connected in series, apparatus, and method and device for manufacturing battery

A battery, comprising:

• a first-type battery cell group and a second-type battery cell group which are connected in series,
• wherein the first-type battery cell group is composed of multiple first-type batteries connected in parallel, and the second type battery cell group is composed of at least one second type battery cell connected in parallel;
• the first-type battery cell and the second-type battery cell are battery cells of different chemical systems, and a volume energy density of the first-type battery cell is less than a volume energy density of the second-type battery cell;
• a capacity Cap1 of the first-type battery cell group is greater than a capacity Cap2 of the second-type battery cell group, and wherein the capacity Cap1 of the first-type battery cell group and the capacity Cap2 of the second-type battery cell group satisfy the following condition:
• 0.01≤(Cap1/Cap2)−1≤0.5, in which the capacity Cap1 of the first-type battery cell group is the sum of the capacities of the corresponding first-type battery cells, and the capacity Cap2 of the second-type battery cell group is the sum of the capacities of the corresponding second-type battery cells;
• wherein the first-type battery cell and the second-type battery cell satisfy at least one of the following conditions:
• a ratio of a specific heat capacity C1 of the first-type battery cell to a specific heat capacity C2 of the second-type battery cell is 0.9≤C1/C2≤10, optionally, 1≤C1/C2≤6, and further optionally, 1.5≤C1/C2≤3;
• a ratio of a heat conductivity coefficient λ1 of the first-type battery cell to a heat conductivity coefficient λ2 of the second-type battery cell is 0.5≤λ1/λ2≤3, optionally, 0.7≤λ1/λ2≤2, and further optionally, 0.9≤λ1/λ2≤1.5;
• a plateau voltage V1 of the first-type battery cell is from 3.15 V±0.05 V to 4.75 V±0.05 V;
• a plateau voltage V2 of the second-type battery cell is from 3.60 to 3.80 V±0.05 V;
• or
• a ratio of a density ρ1 of the first-type battery cell to a density ρ2 of the second-type battery cell is 0.6≤ρ1/ρ2≤3, optionally, 0.8≤ρ1/ρ2≤2, and further optionally, 0.9≤ρ1/ρ2≤1.5.