Battery pack with protective circuit board and electric bicycle including the battery pack

Abstract

To provide a battery pack that is less likely to be affected by vibrations, shocks and the like and has a stable characteristic, and an electric bicycle that uses the battery pack. A battery pack includes: a battery protective member having a first plate section and a second plate section which is integrally connected to both edge portions of a width direction of the first plate section and extends substantially in a direction perpendicular to both surfaces of the first plate section, wherein the flat batteries are placed on the first plate section; and a protective circuit board. A moistureproof film for the protective circuit board is formed using a plurality of film forming materials different in viscosity, hardness, and thixotropic properties.

1 - 8 . (canceled) 
     
     
         9 . A battery pack comprising:
 a battery connecting structure on which a plurality of flat batteries are placed; and   a protective circuit board that protects the flat batteries during charging and discharging of the flat batteries, film formation for the protective circuit board being made using a plurality of film forming materials different in viscosity, wherein   circuit components implemented on the protective circuit board include:   a circuit component having a highest height from the board and having a surface covered only with a first hardening resin, and a circuit component having a surface covered only with a second hardening resin whose viscosity is lower than those of the first hardening resin.   
     
     
         10 . The battery pack according to  claim 9 , wherein
 the circuit components are covered with the first hardening resin in viscosity of 20 to 90 Pa·s at 25° C. and the second hardening resin in viscosity of 0.3 to 1.0 Pa·s at 25° C., respectively.   
     
     
         11 . The battery pack according to  claim 9 , wherein
 the battery connecting structure includes a battery protective member having at least plate section and a second plate section which are integrally connected to both edge portions of a width direction of the plate section and extends substantially in a direction perpendicular to both surfaces of the first plate section, wherein the flat batteries are plate section wherein the flat batteries are placed on the first plate section.   
     
     
         12 . The battery pack according to  claim 11 , wherein
 a surface on which the flat batteries are placed is formed on both surfaces of the first plate section.   
     
     
         13 . The battery pack according to  claim 11 , wherein
 a flat-plate surface of the flat battery is put on the first plate section.   
     
     
         14 . The battery pack according to  claim 11 , wherein
 the flat batteries are film-covered batteries.   
     
     
         15 . An electric bicycle comprising the battery pack as claimed in  claim 9 .