A battery module, comprising: a battery cell assembly including a plurality of battery cells which are stacked one another; each of the plurality of battery cells includes an electrode assembly, a pouch case, and an electrode lead; the pouch case includes a pouch body and a pouch terrace; an interconnection board mounted to at least one side of the battery cell assembly to electrically connect the plurality of battery cells; a temperature sensor mounting groove provided at the interconnection board so that a temperature sensor for measuring a temperature of the battery cell assembly passes therethrough; and an assembling error preventer provided at a bottom of the temperature sensor mounting groove to prevent the temperature sensor from interfacing with the end of the pouch terrace of pouch-cells which end faces the temperature sensor when the temperature sensor passes through the temperature sensor mounting groove wherein the assembling error preventer includes: a preventer body configured to protrude from the bottom of the interconnection board toward the plurality of battery cells and having a sensor passing hole communicating with the temperature sensor mounting groove so that the temperature sensor passes therethrough; and a sensor assembling guider provided at the preventer body to push a facing battery cell, which faces the sensor assembling guider when the interconnection board is mounted, to the outside of the sensor passing hole. a battery cell assembly including a plurality of battery cells which are stacked one another; each of the plurality of battery cells includes an electrode assembly, a pouch case, and an electrode lead; the pouch case includes a pouch body and a pouch terrace; an interconnection board mounted to at least one side of the battery cell assembly to electrically connect the plurality of battery cells; a temperature sensor mounting groove provided at the interconnection board so that a temperature sensor for measuring a temperature of the battery cell assembly passes therethrough; and an assembling error preventer provided at a bottom of the temperature sensor mounting groove to prevent the temperature sensor from interfacing with the end of the pouch terrace of pouch-cells which end faces the temperature sensor when the temperature sensor passes through the temperature sensor mounting groove wherein the assembling error preventer includes: a preventer body configured to protrude from the bottom of the interconnection board toward the plurality of battery cells and having a sensor passing hole communicating with the temperature sensor mounting groove so that the temperature sensor passes therethrough; and a sensor assembling guider provided at the preventer body to push a facing battery cell, which faces the sensor assembling guider when the interconnection board is mounted, to the outside of the sensor passing hole. a preventer body configured to protrude from the bottom of the interconnection board toward the plurality of battery cells and having a sensor passing hole communicating with the temperature sensor mounting groove so that the temperature sensor passes therethrough; and a sensor assembling guider provided at the preventer body to push a facing battery cell, which faces the sensor assembling guider when the interconnection board is mounted, to the outside of the sensor passing hole.