Battery module
View Patent ↗The present disclosure provides a battery module. The battery module comprises: a plurality of mono-batteries arranged along an arrangement direction; and a frame receiving and fixing the plurality of mono-batteries. The battery module further comprises a plurality of isolating plates, each isolating plate is interposed between two adjacent mono-batteries, each isolating plate is provided with a through hole penetrating along the arrangement direction. Each isolating plate is configured to be capable of self-foaming to make a volume of each isolating plate expanded when each isolating plate is heated and a temperature of each isolating plate is more than 200° C. When one mono-battery suffers thermal runaway, the through hole of each isolating plate can form air thermal resistance, thereby preventing heat generated by the runaway mono-battery from massively and quickly transferring to the large surfaces of the adjacent mono-batteries, so as to achieve the purpose of thermal isolation.
1. A battery module, comprising:
a plurality of mono-batteries arranged along an arrangement direction; and
a frame receiving and fixing the plurality of mono-batteries;
wherein
the battery module further comprises a plurality of isolating plates, each isolating plate is interposed between two adjacent mono-batteries, each isolating plate is provided with a through hole penetrating along the arrangement direction;
each isolating plate is configured to be capable of self-foaming to make a volume of the isolating plate expanded when the isolating plate is heated and a temperature of the isolating plate is more than 200° C.; and
a main component of each isolating plate is thermosetting resin which is capable of self-foaming to make a volume thereof expanded when heated, and the thermosetting resin is selected from allyl compound modified bismaleimide resin.
2. The battery module according to claim 1 , wherein the allyl compound is 2,2′-diallylbisphenol A.
3. The battery module according to claim 1 , wherein a compressive strength of each isolating plate is larger than an expansion pressure of the mono-battery adjacent to each isolating plate.
4. The battery module according to claim 1 , wherein a compressive strength of each isolating plate is 20 MPa-150 Mpa.
5. The battery module according to claim 4 , wherein the compressive strength of each isolating plate is 50 MPa-150 Mpa.
6. The battery module according to claim 1 , wherein the through hole is provided as one or multiple in number.
7. The battery module according to claim 6 , wherein the through hole is provided as multiple in number.
8. The battery module according to claim 1 , wherein when each isolating plate is heated and the temperature of each isolating plate is more than 200° C. and each isolating plate has been self-foamed, a porosity in the inside of each isolating plate is 10%-90%.
9. The battery module according to claim 1 , wherein the frame comprises:
two end plates respectively positioned at two ends of the plurality of the mono-batteries along the arrangement direction; and
two side plates respectively positioned at two sides of the plurality of the mono-batteries and perpendicular to the two end plates, the two end plates and the two side plates are fixed together;
the two side plates each are a L-type side plate;
each L-type side plate has a vertical portion and a horizontal portion;
the vertical portion of each side plate and the two end plates are fixed together;
the two horizontal portions of the two L-type side plates are spaced apart from each other and contact and support the plurality of mono-batteries and the two end plates from below.
10. The battery module according to claim 1 , wherein a total plane area of the through hole in each isolating plate is 30%-80% of a total plane area of the isolating plate.
11. The battery module according to claim 10 , wherein the total plane area of the through hole in each isolating plate is 60%-70% of the total plane area of the isolating plate.