Before the disclosure is described in greater detail, it should be noted that where considered appropriate, reference numerals have been repeated among the figures to indicate corresponding or analogous elements, which may optionally have similar characteristics.

It should be noted that the drawings, which are for illustrative purposes only, are not drawn in every detail, and are not intended to represent the actual sizes or actual relative sizes of the components of a battery system.

Referring to FIG. 1, a battery system for an electric vehicle (not shown) according to a first embodiment of the disclosure is shown to include at least one battery module 100 and a management module 200.

The battery module 100 includes a plurality of battery cells 101, and an outer casing 102. The outer casing 102 defines therein an accommodation space 103 for accommodation of the battery cells 101, and is configured to permit a thermal management fluid to flow through the accommodation space 103 to thereby provide thermal management to the battery cells 101. Each of the battery cells 101 has a first terminal 11 and a second terminal 12 opposite to the first terminal 11. The thermal management fluid may be, but is not limited to, mineral oil, silicone oil, ester-based oil, or engineered fluid, etc. In an embodiment, the thermal management fluid is used for cooling the battery cells 101, and is engineered fluid.