Battery module preventing thermal runway
According to one aspect or the present invention, a battery module for an electric vehicle including a battery cell constituting a battery module, a sensing pad attached to a side surface of the battery cell, a battery management system (BMS) which performs transmission and reception communication with the sensing pad, and a cooling water pipe disposed under the battery cell can be provided.
1 . A battery module for an electric vehicle, comprising:
a battery cell ( 100 ) included in the battery module;
a sensing pad ( 200 ) attached to a side surface of the battery cell ( 100 );
a battery management system (BMS, 300 ) which performs transmission and reception communication with the sensing pad ( 200 ); and
a cooling module ( 400 ) which is disposed under the battery cell ( 100 ) and in which a cooling water pipe ( 450 ) is disposed, wherein cooling water flows in the cooling water pipe ( 450 ),
wherein:
the cooling module ( 400 ) includes a cooling plate lower base ( 410 ) disposed at one side of the battery cell ( 100 ); and
the cooling plate lower base ( 410 ) includes a lower surface support end portion ( 411 ) which is horizontally formed, supports a lower side of the battery cell ( 100 ), is formed on a lower surface of the cooling plate lower base ( 410 ), and is in contact with a lower side of the cooling water pipe ( 450 ), and further includes a cooling welding end portion ( 412 ) formed so as to be spaced a predetermined distance upward from the lower surface support end portion ( 411 ),
wherein the cooling welding end portion ( 412 ) and the lower surface support end portion ( 411 ) are connected by a bonding inclined end portion ( 430 ) which extends upward at an inclined angle between 30 and 60 degrees from the lower surface support end portion ( 411 ) and then connected to the cooling welding end portion ( 412 ) forming the same inclined angle, such that the cooling welding end portion ( 412 ) and the lower surface support end portion ( 411 ) are parallel to each other,
wherein the cooling module ( 400 ) includes a plurality of pipe wall surfaces ( 440 ) that define a curved or straight path and have a cross section in an inverted “V” shape and two upward sides of the inverted “V” shape are in contact with outer circumference of the cooling water pipe ( 450 ) to form an installation path for the cooling water pipe ( 450 ),
such that the installation path for the cooling water pipe ( 450 ) is disposed between the bonding inclined end portion ( 430 ) and one upward side of the inverted “V” shape of one of the plurality of pipe wall surfaces ( 440 ) or is disposed between an upward side of the inverted “V” shape of one of the plurality of pipe wall surfaces ( 440 ) and an upward side of the inverted “V” shape of an adjacent one of the plurality of pipe wall surfaces ( 440 ).
2 . The battery module of claim 1 , wherein the sensing pad ( 200 ) is formed as a plurality of strain gauges to measure an expansion pressure of the side surface of the battery cell ( 100 ).
3 . The battery module of claim 1 , wherein:
the BMS ( 300 ) determines a normal section in a case in which a pressure measured in the sensing pad ( 200 ) is within a normal section;
the BMS ( 300 ) determines a warning section in a case in which a pressure measured in the sensing pad ( 200 ) is within a warning section; and
when a pressure measured in the sensing pad ( 200 ) exceeds the warning section, a power relay assembly (PRA) is blocked.
4 . The battery module of claim 3 , wherein:
in the case of the normal section, the BMS ( 300 ) sets a reference flow rate [LPM] to a flow rate [LPM] of the cooling water flowing in the cooling water pipe ( 450 ); and
in the case of the warning section, the BMS ( 300 ) sets a flow rate [LPM] to be increased from the reference flow rate [LPM] to a flow rate [LPM] of the cooling water flowing in the cooling water pipe ( 450 ).
5 . The battery module of claim 4 , wherein, in the case of the warning section, the BMS ( 300 ) transmits a signal to a pump to increase or decrease the flow rate [LPM] of the cooling water flowing in the cooling water pipe to correspond to the measured pressure.
6 . The battery module of claim 1 , wherein each of the cooling welding end portion ( 412 ), the lower surface support end portion ( 411 ), and the bonding inclined end portion ( 430 ) is a flat structure.
7 . The battery module of claim 1 ,
wherein the cooling module ( 400 ) further includes a cooling plate upper base ( 420 ) such that the cooling water pipe ( 450 ) is disposed between the cooling plate upper base ( 420 ) and the cooling plate lower base ( 410 ), and
each of the plurality of pipe wall surfaces ( 440 ) extends from the lower surface support end portion ( 411 ) to the cooling plate upper base ( 420 ).