Battery pack and electric device

Abstract

本实用新型涉及电池领域，公开了电池包及用电装置。电池包包括箱体、多个电芯和结构胶。电芯包括壳体和包裹壳体的绝缘膜，绝缘膜外表面呈网格状或条纹状，绝缘膜包括第一外表面和第二外表面；各电芯中第二外表面与底壁之间、靠近侧壁的电芯中第一外表面与侧壁之间、以及相邻两个电芯中第一外表面之间均通过结构胶粘结固定；沿第二方向，第一外表面与结构胶的粘结表面积为S1，第二外表面与结构胶的粘结表面积为S2，绝缘膜与结构胶之间的剪切强度为σ、拉拔强度为γ，结构胶高出第二外表面的高度为H，满足：800mm2≤S1≤3500mm2，5000mm2≤S2≤10000mm2，3Mpa≤σ≤4.5Mpa，3Mpa≤γ≤4Mpa，2mm≤H≤5mm，5.0*104N·mm≤(S1*σ+S2*γ)*H≤1.4*105N·mm。通过合理结构胶用量，确保绝缘膜与结构胶粘结强度，降低电芯脱落风险，降低成本。

Claims

1. A battery pack, characterized by, include: The enclosure includes a bottom wall and two side walls connected to opposite sides of the bottom wall along a first direction; Multiple battery cells are disposed in the housing and arranged along the first direction. Each battery cell includes a housing and an insulating film that wraps the housing. The outer surface of the insulating film is grid-like or striped. The insulating film includes a first outer surface and a second outer surface. The first outer surface corresponds to the surface with the largest area of ​​the housing. The first outer surfaces of two adjacent battery cells face each other along the first direction. The structural adhesive is used to bond and fix the second outer surface of each battery cell to the bottom wall, the first outer surface of the battery cell near the side wall to the side wall, and the first outer surfaces of two adjacent battery cells. Wherein, the bonding surface area between the first outer surface and the structural adhesive is S1, the bonding surface area between the second outer surface and the structural adhesive is S2, the shear strength between the insulating film and the structural adhesive along the second direction perpendicular to the first direction is σ, the pull-out strength is γ, the height of the structural adhesive above the second outer surface is H, and the second direction is the height direction of the battery cell, satisfying: 800mm. 2 ≤S1≤3500mm 2 5000mm 2 ≤S2≤10000mm 2 , 3Mpa≤σ≤4.5Mpa, 3Mpa≤γ≤4Mpa, 2mm≤H≤5mm, 5.0*10 4 N·mm≤(S1*σ+S2*γ)*H≤1.4*10 5 N·mm.

2. The battery pack according to claim 1, characterized in that, The battery cell is a blade battery cell, and along the first direction, the width of the battery cell is W, 14.5mm≤W≤23mm; Along the second direction, the height of the battery cell is H1, 85mm≤H1≤180mm; Along the third direction, the length of the battery cell is L, 350mm≤L≤550mm, and the first direction, the second direction and the third direction are perpendicular to each other; The structural adhesive completely covers the second outer surface.

3. The battery pack according to claim 2, characterized in that, 1400mm 2 ≤S1≤3500mm 2 ,5000mm 2 ≤S2≤8100mm 2 ,6.0*10 4 N·mm≤(S1*σ+S2*γ)×H≤1.4*10 5 N·mm.

4. The battery pack according to claim 1, characterized in that, The battery cell is a prismatic battery cell, and the structural adhesive partially covers the second outer surface; Along the first direction, the width of the battery cell is W′, where 25mm≤W′≤75mm; Along the second direction, the height of the battery cell is H2, 90mm≤H2≤130mm; Along the third direction, the length of the battery cell is L1, 150mm≤L1≤380mm, and the bonding length between the insulating film and the structural adhesive is L2, 130mm≤L2≤270mm. The first direction, the second direction and the third direction are perpendicular to each other.

5. The battery pack according to claim 4, characterized in that, 800 mm 2 ≤ S1 ≤ 2000 mm 2 , 6000 mm 2 ≤ S2 ≤ 10000 mm 2 , 2 mm ≤ H ≤ 4 mm, 5.0*10 4 N·mm ≤ (S1 * σ + S2 * γ) * H ≤ 1.3*10 5 N·mm.

6. The battery pack according to any one of claims 1-5, characterized in that, The thickness of the structural adhesive is T2, 0.5mm≤T2≤2mm; the thickness of the insulating film is T1, 0.1mm≤T1≤0.15mm.

7. The battery pack according to any one of claims 1-5, characterized in that, The outer surface of the insulating film is a frosted surface, and the roughness of the frosted surface is Ra, 1≤Ra≤1.

5.

8. The battery pack according to any one of claims 1-5, characterized in that, An opening is provided on one side of the housing; The cell also includes an electrode assembly and a cover plate, the cover plate closing the opening so that the cover plate and the housing together form a closed space for accommodating the electrode assembly.

9. The battery pack according to any one of claims 1-5, characterized in that, The insulating film includes a glue layer and an insulating layer, the glue layer is bonded between the shell and the insulating layer, and the insulating layer has an outer surface of the insulating film on a side away from the glue layer in a thickness direction of the insulating film.

10. An electrical device, characterized in that, Comprising: The battery pack of any one of claims 1-9.

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