Battery module having resin layer in module case

Patent metadata

Field	Value
Publication number	US-10998598-B2
Application number	US-201716081150-A
Country	US
Kind code	B2
Filing date	Apr 3, 2017
Priority date	Apr 1, 2016
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

The present application can provide a battery module, a manufacturing method thereof, and a resin composition applied to the manufacturing method. The present application can provide a battery module having excellent power relative to volume, while being manufactured in a simple process and at a low cost, a manufacturing method thereof, and a resin composition applied to the manufacturing method.

First claim

The invention claimed is:

1. A battery module comprising:
a module case having a bottom plate and sidewalls forming an internal space;
a plurality of pouch-type battery cells existing in the internal space of said module case; and
a resin layer existing in the internal space of said module case,
wherein said the resin layer has a flame retardance grade of V-0 or higher in UL 94 V test, wherein the resin layer and comprises resin components,
wherein the resin layer is an adhesive layer and is in contact with the plurality of the battery cells and also in contact with the bottom plate,
wherein the bottom plate in contact with the resin layer comprises a thermally conductive region, and
wherein the resin layer has a thermal conductivity of 1.5 W/mK or more,
wherein a contact ratio of the resin layer and the bottom plate is 70% or more relative to a total area of the bottom plate, and
wherein the module case is partly filled by the resin layer.

2. The battery module according to claim 1 , wherein a contact ratio of the resin layer and the thermally conductive region is 80% or more, relative to the total area of a thermally conductive region.

3. The battery module according to claim 1 , wherein the resin layer further comprises a phosphorous flame retardant.

4. The battery module according to claim 3 , wherein the phosphorus flame retardant comprises a liquid phosphorus flame retardant and a solid phosphorus flame retardant.

5. The battery module according to claim 4 , wherein the liquid phosphorus flame retardant is a phosphate flame retardant.

6. The battery module according to claim 4 , wherein the solid phosphorus flame retardant is a phosphinate flame retardant.

7. The battery module according to claim 4 , wherein the solid phosphorus flame retardant is in the form of a powder having a particle diameter (D50) in a particle size distribution 50% within a range of 1 μm to 10 μm.

8. The battery module according to claim 4 , wherein the ratio (A/B) of the weight (A) of the liquid phosphorus flame retardant and the weight (B) of the solid phosphorus flame retardant is within a range of 0.5 to 1.5.

9. The battery module according to claim 3 , wherein the phosphorus flame retardant is contained in a ratio of 20 to 40 parts by weight, relative to 100 parts by weight of the resin components.

10. The battery module according to claim 3 , wherein the resin layer comprises only the phosphorus flame retardant as a flame retardant.

11. The battery module according to claim 1 , wherein the resin layer comprises an acrylic resin, an epoxy resin, a urethane resin, an olefin resin, an EVA resin, or a silicone resin.

12. The battery module according to claim 1 , wherein the resin layer comprises a filler.

13. The battery module according to claim 12 , wherein the filler is ceramic particles or carbonaceous fillers.

14. A battery pack comprising two or more battery modules of claim 1 electrically connected to each other.

15. The battery module of claim 1 , wherein the resin layer has an adhesive force of about 50 gf/10 mm to 1,000 gf/10 mm measured at a peel rate of about 300 mm/min and a peel angle of 180 degrees.

16. The battery module of claim 1 , wherein the bottom plate comprises an injection hole.

17. The battery module of claim 16 , wherein bottom plate further comprises an observation hole.

18. The battery module of claim 1 , wherein the resin component is an epoxy resin, an urethane resin or a silicone resin.

19. A battery module comprising:
a module case having a bottom plate and sidewalls forming an internal space;
a plurality of pouch-type battery cells existing in the internal space of said module case; and
a resin layer existing in the internal space of said module case,
wherein said the resin layer has a flame retardance grade of V-0 or higher in UL 94 V test, and wherein the resin layer comprises resin components,
wherein the resin layer is an adhesive layer and is in contact with the plurality of the battery cells and also in contact with the sidewalls,
wherein the sidewalls in contact with the resin layer comprise a thermally conductive region,
wherein the resin layer has a thermal conductivity of 1.5 W/mK or more,
wherein a contact ratio of the resin layer and the bottom plate is 70% or more relative to a total area of the bottom plate, and
wherein the module case is partly filled by the resin layer.

20. The battery module according to claim 19 , wherein a contact ratio of the resin layer and the thermally conductive region is 80% or more, relative to a total area of the thermally conductive region.

21. The battery module of claim 19 , wherein the resin layer has an adhesive force of about 50 gf/10 mm to 1,000 gf/10 mm measured at a peel rate of about 300 mm/min and a peel angle of 180 degrees.

22. The battery module of claim 19 , wherein sidewalls comprise an injection hole.

23. The battery module of claim 19 , wherein sidewalls further comprise an observation hole.

24. The battery module of claim 19 , wherein the resin component is an epoxy resin, an urethan resin or a silicone resin.

Assignees

• Lg Chemical Ltd

Inventors

• Park Eun Suk
• Cho Yoon Gyung
• Park Sang Min
• Yang Se Woo
• Yang Jae Hun
• Oh Kyung Su
• Lee Jae Min
• Kim Young Gil
• Bae Gyu Jong
• Im Kyoung Bin

Classifications

• H01M50/211

  adapted for pouch cells · CPC title

• C08K5/49

  Phosphorus-containing compounds {(C08K5/0091 takes precedence)} · CPC title

• C08K5/0066

  Flame-proofing or flame-retarding additives · CPC title

• C09K21/12

  containing phosphorus · CPC title

• H01M50/20

  Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders (structural combination of accumulators with charging apparatus H01M10/46) · CPC title