Battery pack and electrical device

Abstract

A battery pack, characterized in that it comprises: a battery cell (100) having a casing (1) and an insulating layer (2) coated on the outer surface of the casing (1); an outer surface of one side of the casing (1) is defined as an opening surface (11), and the portion coated by the insulating layer (2) on the opening surface (11) at least partially penetrates the casing to form an opening portion (21); the portion coated by the insulating layer (2) on the opening surface (11) and located outside the opening portion (21) forms a coating portion (22); the battery pack further comprises: an adjacent circuit board (200) located adjacent to the opening surface (11), and the insulating layer (2) is arranged between the adjacent circuit board (200) and the opening surface (11);the area of ​​the opening portion (21) is defined as "s1", and the area of ​​the coating portion (22) is defined as "s2"; in the direction perpendicular to the opening area (11), the minimum distance between the outer surface of the housing (1) overlying the projection of the opening portion (21) and close to the adjacent circuit board (200) and the adjacent circuit board is defined as "d1", and the thickness of the insulating layer (22) at the coating portion (22) is defined as "d2"; which satisfies: 8.86E−10≤100⋅k1⋅s1 / d1+d1+k2⋅s2 / d2≤4.55E−08, Unit: F; where "k1" is the dielectric constant of a structural adhesive layer (3) bonded between the outer surface of the housing (1) and the adjacent circuit board (200) at 40°C, and "k2" is the dielectric constant of the insulating layer (2) at 40°C; the range of the value of "k1" is 3.01E-11≤k1≤3.81E-11; the range of the value of "k2" is 2.66E-11≤k2≤3.01E-11, Unit: F / m.;

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