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 method of manufacturing a battery module, comprising:
injecting a resin composition into a module case of a battery module, the module case including a lower plate and a sidewall forming an inside space, and the resin composition being a room temperature curing type resin composition;
accommodating a plurality of battery cells in the inside space of the module case such that a first end portion of each of the battery cells faces the lower plate, each of the plurality of battery cells having a second end portion opposite to the first end portion; and
after the step of accommodating the plurality of battery cells in the inside space, curing the resin composition in the inside space of the module case so as to form a resin layer therein, the curing being performed by maintaining the injected resin composition at room temperature,
wherein the resin layer partially fills the inside space of the module case, such that the resin layer contacts the lower plate of the module case and each of the first end portions of the plurality of battery cells, but the resin layer does not contact each of the second end portions of the plurality of battery cells.
2. The method of claim 1 , wherein the resin composition is injected into the inside space of the module case after the step of accommodating the plurality of battery cells in the inside space, and wherein the resin composition is injected into the inside space through an injection hole provided in the lower plate or the sidewall.
3. The method of claim 2 , wherein the lower plate or the sidewall in which the injection hole is provided includes an observation hole.
4. The method of claim 1 , wherein the resin layer comprises thermally conductive fillers and has thermal conductivity of 1.5 W/mK or more.
5. The method of claim 4 , wherein the thermally conductive fillers are ceramic particles.
6. The method of claim 1 , wherein the resin layer is formed so as to conform to the plurality of battery cells.
7. The method of claim 1 , wherein the sidewall or the lower plate in contact with the resin layer includes a thermally conductive region.
8. The method of claim 7 , 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.
9. The method of claim 1 , wherein the resin layer comprises thermally conductive fillers and has thermal conductivity of 2 W/mK or more.
10. The method of claim 1 , wherein the resin layer has an insulation breakdown voltage of 10 kV/mm or more.
11. The method of claim 1 , wherein the resin layer has adhesion strength of 1,000 gf/10 mm or less.
12. The method of claim 1 , wherein the resin layer has a specific gravity of 5 or less.
13. The method 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.
14. The method 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.
15. The method 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.
16. The method 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.
17. The method of claim 1 , wherein the resin layer has a thickness in a range of 100 μm to 5 mm.
18. The method of claim 1 , wherein the step of curing the resin composition is performed while the resin composition is in contact with the plurality of battery cells.