电池单体、电池装置及用电装置

Abstract

本申请涉及一种电池单体、电池装置及用电装置，电池单体包括：复合壳体、端盖以及设于端盖上的泄压机构；复合壳体包括壳体本体层和壳体附加层；壳体本体层，壳体本体层的一端具有开口，端盖与壳体本体层连接并盖合于开口；以及壳体附加层，壳体附加层包括隔热层和耐压层，隔热层包覆于壳体本体层外，耐压层包覆于隔热层外；其中，壳体附加层设有散热口，以使壳体本体层形成被散热口裸露的散热区域和被壳体附加层包覆的被保护区域，壳体本体层在散热区域的厚度大于至少部分被保护区域的厚度。

Claims

1. A battery cell, characterized by, The battery cell includes: a composite housing, an end cap, and a pressure relief mechanism disposed on the end cap; the composite housing includes a housing body layer and a housing additional layer; A housing body layer, one end of which has an opening, and an end cap connected to the housing body layer and covering the opening; and An additional shell layer, comprising a heat insulation layer and a pressure-resistant layer, wherein the heat insulation layer covers the outer surface of the shell body layer and the pressure-resistant layer covers the outer surface of the heat insulation layer; The additional shell layer is provided with heat dissipation vents, so that the shell body layer forms a heat dissipation area exposed by the heat dissipation vents and a protected area covered by the additional shell layer. The thickness of the shell body layer in the heat dissipation area is greater than the thickness of at least part of the protected area.

2. The battery cell of claim 1, wherein, The shell body layer includes: an end wall, two first side walls connected to the end wall and opposite to each other in a first direction, and two second side walls connected to the end wall and opposite to each other in a second direction, wherein the ends of the two first side walls away from the end wall and the ends of the two second side walls away from the end wall together form the opening; Wherein, the thickness of the end wall is greater than the thickness of the first side wall, and the heat dissipation port includes a first heat dissipation port, which exposes at least a portion of the outer surface of the end wall; and / or, The thickness of the second sidewall is greater than the thickness of the first sidewall, and the heat dissipation port includes a second heat dissipation port, which exposes a portion of the outer surface of the second sidewall.

3. The battery cell of claim 2, wherein, The thickness of the first sidewall is less than the thickness of the end wall and less than the thickness of the second sidewall; the additional shell layer includes a first side protective wall, which covers the outer surface of the first sidewall.

4. The battery cell of claim 2, wherein, The additional shell layer includes a first end protective wall, the first heat dissipation vent is disposed on the first end protective wall, and the first end protective wall covers the perimeter of the outer surface of the end wall.

5. The battery cell of claim 2, wherein, The additional shell layer includes a second side protective wall, the second heat dissipation vent is disposed on the second side protective wall, and the second side protective wall covers the perimeter of the outer surface of the second side wall.

6. The battery cell of claim 2, wherein, The area of ​​the second heat dissipation vent is less than or equal to 40% of the area of ​​the outer surface of the second sidewall.

7. The battery cell of claim 2, wherein, The thickness of the end wall is greater than the thickness of the first side wall and greater than the thickness of the second side wall, and the first heat dissipation port exposes the entire area of ​​the outer surface of the end wall.

8. The battery cell of claim 2, wherein, The shell additional layer includes a first portion and a second portion arranged along the second direction, the first portion and the second portion being fitted onto the shell body layer opposite to each other along the second direction.

9. The battery cell of claim 1, wherein, The shell body layer includes: an end wall, two first side walls connected to the end wall and opposite to each other in a first direction, and two second side walls connected to the end wall and opposite to each other in a second direction, wherein the ends of the two first side walls away from the end wall and the ends of the two second side walls away from the end wall together form the opening; The first sidewall is welded to the end cap and has a first weld, and the second sidewall is welded to the end cap and has a second weld; The additional shell layer at least covers the first weld and the outer surface of the first sidewall near the first weld, and the additional shell layer at least covers the second weld and the outer surface of the second sidewall near the second weld.

10. The battery cell of claim 1, wherein, The composite housing also includes a heat-conducting sheet, which is connected to the housing body layer and covers the heat dissipation area.

11. The battery cell of any one of claims 1-10, wherein, The thickness t1 of the insulation layer satisfies the following conditions: 0.5mm ≥ t1 ≥ 0.1mm; and / or, The thickness t2 of the pressure-resistant layer satisfies the condition: 0.5mm ≥ t2 ≥ 0.1mm.

12. The battery cell according to any one of claims 1-10, characterized in that, The pressure-resistant layer is made of carbon fiber resin composite material; and / or, The insulation layer is made of any one of aerogel, ceramic or mica materials.

13. A battery device characterized by comprising: The battery includes a battery box and a battery cell according to any one of claims 1-12. The battery box includes a box body and a liquid cooling plate connected to the box body, and the battery cell is located inside the box body. The heat dissipation area is used for heat exchange with the liquid cooling plate.

14. An electrical device, comprising: Includes the battery device of claim 13, the battery device being used to provide electrical energy to the electrical device.

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