Battery module comprising cooling plate filled with phase change material

1 . A battery module comprising:

a plurality of battery cells;

a plurality of cooling plates each installed between adjacent battery cells among the plurality of battery cells to absorb heat from the plurality of battery cells;

a heat transfer interface material coupled to one side of the plurality of battery cells to be in contact with the plurality of cooling plates, and receiving heat from the cooling plates; and

a cooling channel coupled to one side of the heat transfer interface material to receive heat from the heat transfer interface material and transfer heat to outside,

wherein each cooling plate of the plurality of cooling plates includes plurality of chambers containing a phase change material,

wherein the plurality of chambers are arranged such that a chamber located farther from the heat transfer interface material contains the phase change material having lower phase change temperatures than the phase change material contained in a chamber located closer to the heat transfer interface material.

2 . The battery module of claim 1 , wherein the plurality of cooling plates are made of aluminum.

3 . The battery module of claim 2 , wherein the number of the plurality of chambers is 5 or less.

4 . The battery module of claim 3 , wherein a shortest distance between at least one of the plurality of chambers and an outer circumferential surface of the cooling plate of the plurality of cooling plates is half of a width of the at least one of the plurality of chambers.

5 . The battery module of claim 4 , wherein the width of the at least one of the plurality of chambers is 2 mm or less.

6 . The battery module of claim 5 , wherein a height of the at least one of the plurality of chambers is 5 mm or more.

7 . The battery module of claim 6 , wherein the cooling plate of the plurality of cooling plates has a predetermined portion inserted into the heat transfer interface material, and a length of the predetermined portion is 5% or more of a longitudinal length of the cooling plate of the plurality of cooling plates to be further away from the heat transfer interface material.

8 . The battery module of claim 7 , wherein the phase change material filling each cooling plate of the plurality of cooling plates is a paraffin-based material.

9 . The battery module of claim 8 , wherein the phase change temperature of the phase change material filling each cooling plate of the plurality of cooling plates is 5 degrees or more and 55 degrees or less.

10 . The battery module of claim 9 , wherein a pad having elasticity is installed between each cooling plate of the plurality of cooling plates and each of the plurality of battery cells adjacent to each cooling plate.

11 . The battery module of claim 10 , in which each of the plurality of battery cells is a prismatic battery cell or a pouch-type battery cell, further comprising:

a board including a bus bar electrically connecting the plurality of battery cells to each other and a printed wiring circuit board for measuring voltages and temperatures of the plurality of battery cells, and installed on a top of the plurality of battery cells;

a front plate coupled to a front of the plurality of battery cells;

a rear plate coupled to a rear of the plurality of battery cells;

a side plate coupled to a side of the plurality of battery cells; and

an upper cover coupled to the top of the plurality of battery cells to cover the board.

12 . The battery module of claim 11 , wherein the heat transfer interface material has a thermal conductivity of 3 W/mk or more.