Pressure sensitive adhesive sheet for batteries and lithium-ion battery

A pressure sensitive adhesive sheet for batteries, comprising:

• a base material;
• and
• a pressure sensitive adhesive layer provided on one surface side of the base material and containing inorganic fine particles,
• wherein an average particle diameter of the inorganic fine particles is 0.8 μm or more and 10 μm or less,
• wherein the pressure sensitive adhesive layer is formed of a pressure sensitive adhesive composition containing the inorganic fine particles,
• wherein when D50′ and D90′ are defined as a volume-based accumulated 50% particle diameter of the inorganic fine particles and a volume-based accumulated 90% particle diameter of the inorganic fine particles, respectively, in a particle size distribution of the inorganic fine particles in the pressure sensitive adhesive composition,
• the D50′ is 0.1 μm or more and 2.0 μm or less, and
• a ratio of the D90′ to the D50′ (D90′/D50′) is 1.5 or more and 4.0 or less,
• wherein the particle size distribution is measured by a laser diffraction/scattering method.

A lithium-ion battery in which two or more conductors are fixed in a state of being in contact with each other inside the battery using a pressure sensitive adhesive sheet, wherein:

• the pressure sensitive adhesive sheet comprises a base material and a pressure sensitive adhesive layer provided on one surface side of the base material,
• the pressure sensitive adhesive layer contains inorganic fine particles,
• an average particle diameter of the inorganic fine particles is 0.8 μm or more and 10 μm or less, and
• when D50 and D90 are defined as a volume-based accumulated 50% particle diameter of the inorganic fine particles and a volume-based accumulated 90% particle diameter of the inorganic fine particles, respectively, in a particle size distribution of the inorganic fine particles in the pressure sensitive adhesive layer:
• D50 is 0.5 μm or more and 2.8 μm or less, and
• a ratio of D90 to D50 (D90/D50) is 1.3 or more and 2.0 or less, and
• the particle size distribution is measured by image analysis on a surface of the pressure sensitive adhesive layer opposite to the base material.

A lithium-ion battery in which two or more conductors are fixed in a state of being in contact with each other inside the battery using a pressure sensitive adhesive sheet, wherein:

• the pressure sensitive adhesive sheet comprises a base material and a pressure sensitive adhesive layer provided on one surface side of the base material,
• the pressure sensitive adhesive layer is formed of a pressure sensitive adhesive composition containing an inorganic fine particles,
• an average particle diameter of the inorganic fine particles is 0.8 μm or more and 10 μm or less, and
• when D50′ and D90′ are defined as a volume-based accumulated 50% particle diameter of the inorganic fine particles and a volume-based accumulated 90% particle diameter of the inorganic fine particles, respectively, in a particle size distribution of the inorganic fine particles in the pressure sensitive adhesive composition:
• D50′ is 0.1 μm or more and 2.0 μm or less, and
• a ratio of D90′ to D50′ (D90′/D50′) is 1.5 or more and 4.0 or less, and
• the particle size distribution is measured by a laser diffraction/scattering method.