电热毯的发热元件是毯中的电热丝。通电后电 热丝产生热量，使温度上升，在正常使用时温度达 到一定安全值，放热和散热平衡。如果增加覆盖物 （如棉被），温度会进一步升高，从而达到新的放热 散热平衡，再增加覆盖物温度会进一步上升到电热 丝的极限工作温度，使电热绝缘加速 The heating element of the electric blanket is a heating wire in the blanket. Electric heat wire after heating, so that the temperature rise in the normal use of the temperature reaches a certain safety value, heat and heat balance. If you add a cover (such as quilts), the temperature will be further increased, so as to achieve a new balance of exothermic heat dissipation, and then increase the cover temperature will further rise to the maximum working temperature of the heating wire, so that thermal insulation accelerated