BATTERY MODULE, BATTERY PACK, AND ELECTRICAL APPARATUS
A battery module includes one or more first battery cells and one or more second battery cells. A first number a of the one or more first battery cells is greater than or equal to a second number b of the one or more second battery cells. A first product X 1 of a first volumetric energy density E 1 and a first thickness T 1 of each of the one or more first battery cells and a second product X 2 of a second volumetric energy density E 2 and a second thickness T 2 of each of the one or more second battery cells satisfy. 0.35≤X 1 /X 2 ≤18.
1 . A battery module, comprising:
one or more first battery cells; and
one or more second battery cells;
wherein
a first number a of the one or more first battery cells is greater than or equal to a second number b of the one or more second battery cells; and
a first product X 1 of a first volumetric energy density E 1 and a first thickness T 1 of each of the one or more first battery cells and a second product X 2 of a second volumetric energy density E 2 and a second thickness T 2 of each of the one or more second battery cells satisfy: 0.35≤X 1 /X 2 ≤18.
2 . The battery module according to claim 1 , wherein X 1 and X 2 satisfy: 0.45≤X 1 /X 2 ≤4.5.
3 . The battery module according to claim 1 , wherein the first number a and the second number b satisfy: 1≤a/b≤50.
4 . The battery module according to claim 1 , wherein
the second volumetric energy density E 2 is greater than 600 Wh/L, and the first thickness T 1 , the second thickness T 2 , the first number a, and the second number b satisfy: 1.05≤(T 1 /T 2 )*(a/b)≤1000; or
the second volumetric energy density E 2 is less than 600 Wh/L, and the first thickness T 1 , the second thickness T 2 , the first number a, and the second number b satisfy: 1≤(T 1 /T 2 )*(a/b)≤1000.
5 . The battery module according to claim 1 , wherein the first thickness T 1 and the second thickness T 2 satisfy: 1≤T 1 /T 2 ≤20.
6 . The battery module according to claim 1 , wherein a first volume V 1 of each of the one or more first battery cells and a second volume V 2 of each of the one or more second battery cells satisfy: 1≤V 1 /V 2 ≤20.
7 . The battery module according to claim 1 , wherein the first volumetric energy density E 1 and the second volumetric energy density E 2 satisfy: 0.3≤E 1 /E 2 ≤1.
8 . The battery module according to claim 1 , wherein the first volumetric energy density E 1 satisfies: 155 Wh/L≤E 1500 Wh/L.
9 . The battery module according to claim 1 , wherein the second volumetric energy density E 2 satisfies: 450 Wh/L≤E 2 ≤800 Wh/L.
10 . The battery module according to claim 1 , wherein a first gravimetric energy density G 1 of each of the one or more first battery cells and a second gravimetric energy density G 2 of each of the one or more second battery cells satisfy: 0.3≤G 1 /G 2 ≤1.
11 . The battery module according to claim 10 , wherein the first gravimetric energy density G 1 satisfies: 65 Wh/kg≤G 1 ≤235 Wh/kg.
12 . The battery module according to claim 10 , wherein the second gravimetric energy density G 2 satisfies: 220 Wh/kg≤G 2 ≤400 Wh/kg.
13 . The battery module according to claim 1 , wherein:
in a cross section perpendicular to a thickness direction of the one or more first battery cells, the one or more first battery cells and the one or more second battery cells have a substantially same cross-sectional area;
a first height H 1 of each of the one or more first battery cells and a second height H 2 of each of the one or more second battery cells satisfy: 0.9≤H 1 /H 2 ≤1.1; and
a first width W 1 of each of the one or more first battery cells and a second width W 2 of each of the one or more second battery cells satisfy: 0.9≤W 1 /W 2 ≤1.1.
14 . The battery module according to claim 1 , wherein:
the one or more first battery cells are connected in series to the one or more second battery cells.
15 . The battery module according to claim 1 , wherein
each of the one or more first battery cells includes a sodium-ion battery, and each of the one or more second battery cells includes a lithium-ion battery; or
each of the one or more first battery cells includes a lithium iron phosphate battery, a lithium manganese phosphate battery, a lithium manganese iron phosphate battery, a lithium manganate battery, a lithium titanate battery, and a lithium vanadium phosphate battery, and each of the one or more second battery cells includes a lithium nickel cobalt manganese oxide battery, a lithium nickel cobalt aluminum oxide battery, a lithium nickel cobalt manganese aluminum oxide battery, a lithium cobalt oxide battery, and a lithium manganese nickel oxide battery.
16 . The battery module according to claim 1 , wherein:
the one or more first battery cells include a plurality of first battery cells; and
the one or more second battery cells are spaced apart by the plurality of the first battery cells.
17 . The battery module according to claim 1 , wherein at least one of the one or more second battery cells is disposed at an end or in a middle of the battery module.
18 . A battery pack, comprising the battery module according to claim 1 .
19 . An electrical apparatus, comprising the battery pack according to claim 18 .