电池包及用电装置

Abstract

本实用新型涉及电池技术领域，公开了电池包及用电装置，其中该电池包，包括：箱体、多个电芯和结构胶；多个电芯并排设于箱体内，各个电芯具有电芯壳体，电芯壳体的外表面包覆有绝缘膜；结构胶涂覆于各个电芯沿厚度方向的相对两个侧面以及底面，结构胶与绝缘膜粘接固定，位于电芯底面的绝缘膜上间隔开设多个通孔，结构胶穿过各个通孔并与电芯壳体粘接固定；在电芯的底面，结构胶与电芯之间的粘接面积为S1，电芯壳体与结构胶之间的粘接面积为S2；沿电芯厚度方向的两侧，绝缘膜与结构胶之间的粘接面积为S3；满足15000N≤S2×β+(S1‑S2+S3)×σ≤37000N。本实用新型通过合理搭配结构胶与绝缘膜之间的粘接面积，能够显著提升结构胶与绝缘膜的粘接强度。

Claims

1. A battery pack, characterized by, include: Box; Multiple battery cells are arranged side by side in the housing. Each battery cell has a battery cell shell. The outer surface of the battery cell shell is covered with an insulating film. The outer surface of the insulating film is provided with a frosted reinforcing layer. Structural adhesive is applied to two opposite sides and the bottom surface of each of the battery cells along the thickness direction. The structural adhesive is bonded and fixed to the insulating film to fix each of the battery cells to the housing. Multiple through holes are opened at intervals on the insulating film located on the bottom surface of the battery cells. The structural adhesive passes through each of the through holes and is bonded and fixed to the battery cell housing. On the bottom surface of the battery cell, the bonding area between the structural adhesive and the battery cell is S1, and the bonding area between the battery cell housing and the structural adhesive is S2; along both sides of the battery cell thickness direction, the bonding area between the insulating film and the structural adhesive is S3; along the length direction of the battery cell, the shear strength of the bond between the insulating film and the structural adhesive is σ, and the shear strength of the bond between the battery cell housing and the structural adhesive is β; satisfying 15000N≤S2×β+(S1-S2+S3)×σ≤37000N.

2. The battery pack of claim 1, wherein, S1 = W1 × L1, where W1 is the bottom width of the battery cell and L1 is the coating length of the structural adhesive, satisfying 15mm ≤ W1 ≤ 25mm and 250mm ≤ L1 ≤ 380mm.

3. The battery pack of claim 2, wherein, S2 = N x π x W2, if the through hole is a circular hole 2 / 4, wherein N is the number of the through hole, W2 is the diameter of the through hole, and 7mm ≤ W2 ≤ 15mm is satisfied.

4. The battery pack of claim 3, wherein, 0.45≤W2 / W1≤0.

6.

5. The battery pack of claim 3, wherein, 0.14≤S2 / S1≤0.

25.

6. The battery pack of claim 2, wherein, S3 = 2 × H1 × L1, where H1 is the coating height of the structural adhesive along the height of the battery cell and the insulating film on both sides of the battery cell thickness direction, satisfying 1.5mm ≤ H1 ≤ 3mm.

7. The battery pack of any one of claims 1-6, wherein, 3Mpa≤σ≤4.5Mpa, 4.8Mpa≤β≤7.5Mpa.

8. The battery pack according to any one of claims 1 to 6, characterized in that, The frosted reinforcement layer includes a frosted mesh layer or a frosted stripe layer.

9. The battery pack of claim 8, wherein, The surface roughness of the frosted reinforcement layer is Ra, which satisfies 1.2μm≤Ra≤2μm; And / or, the thickness of the insulating film is T1, satisfying 0.1mm≤T1≤0.15mm.

10. An electrical device, characterized by include: The battery pack according to any one of claims 1 to 9.

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