Thermal management of a Li-ion battery is a critical issue affecting its performance, endurance, and operation security. This paper focuses on the effects of a self-designed thermal management module (TMM) on the temperature characteristics of the Li-ion battery. This TMM uses heat pipes as the main elements for heat transfer with the aid of a heat collecting plate and cooling fins. The thermal issues and necessity of using this TMM are evaluated. The influences of heat collecting plate, heat pipe layout, and air-blowing operation are all discussed. The influential factors and related mechanisms are accordingly analyzed. Results indicate that the use of a heat collecting plate, the setup of a dual heat pipe, and forced air convection are all helpful to reduce the battery temperature. The simulation results based on Icepak also suggest that this heat-pipe-based TMM is able to depress the temperature rise of the battery pack at an appropriate level.