Battery module
Provided are a battery module, a method of manufacturing the same, and a resin composition applied to the method of manufacturing the same. A battery module manufactured with a simple process and low cost but having excellent output for the size thereof, a method of manufacturing the same, and a resin composition applied to the method of manufacturing the same are provided in the present invention.
1. A battery module comprising:
a module case including a lower plate and a sidewall forming an inside space;
a plurality of battery cells provided in the inside space of the module case; and
a resin layer provided in the inside space of the module case,
wherein the resin layer comprises thermally conductive fillers and has thermal conductivity of 1.5 W/mK or more, and
wherein the resin layer is in contact with the plurality of battery cells and also in contact with the lower plate or the sidewall of the module case, and
wherein the resin layer is formed so as to conform to the plurality of battery cells.
2. The battery module of claim 1 , wherein an injection hole through which a resin composition is injected is formed in the lower plate or the sidewall in contact with the resin layer.
3. The battery module of claim 2 , wherein an observation hole is formed in the lower plate or the sidewall in which the injection hole is formed.
4. The battery module of claim 1 , wherein the sidewall or the lower plate in contact with the resin layer includes a thermally conductive region.
5. The battery module of claim 4 , wherein a contact ratio of the resin layer to the thermally conductive region is 80% or more of the entire area of the thermally conductive region.
6. The battery module of claim 1 , wherein the resin layer has thermal conductivity of 2 W/mK or more.
7. The battery module of claim 1 , wherein the resin layer has an insulation breakdown voltage of 10 kV/mm or more.
8. The battery module of claim 1 , wherein the resin layer has adhesion strength of 1,000 gf/10 mm or less.
9. The battery module of claim 1 , wherein the resin layer has a specific gravity of 5 or less.
10. The battery module of claim 1 , wherein a shore A hardness of the resin layer is less than 100 or a shore D hardness is 70 or less.
11. The battery module of claim 1 , wherein, in a thermogravimetric analysis (TGA), the amount of residue of the resin layer at 800° C. is 70 weight % or more.
12. The battery module of claim 1 , wherein the resin layer includes an acrylic resin, an epoxy resin, an urethane resin, an olefin resin, an ethylene vinyl acetate (EVA) resin, or a silicone resin.
13. The battery module of claim 1 , wherein the thermally conductive fillers are ceramic particles.
14. The battery module of claim 1 , wherein the resin layer includes a thixotropic additive, a diluent, a dispersant, a surface treatment agent, a flame retardant, or a coupling agent.
15. The battery module of claim 1 , wherein the resin layer has a thickness in a range of 100 μm to 5 mm.
16. A battery pack comprising two or more battery modules, each of which is the battery module of claim 1 , electrically connected to each other.
17. A vehicle comprising the battery module of claim 1 or the battery pack of claim 16 .
18. The battery module of claim 1 , wherein the resin layer is an adhesive layer.