Gas adsorption apparatus, end cap assembly, battery cell, battery, and electrical device
Embodiments of this application provide a gas adsorption apparatus, an end cap assembly, a battery cell, a battery, and an electrical device, and relate to the technical field of batteries. The gas adsorption apparatus is applicable to a battery cell, and includes: a main body, containing a chamber; a first pressure relief portion, disposed on the main body, and configured to be actuated when an internal pressure or temperature of the battery cell reaches a first threshold, so as to implement communication between the chamber and an interior of the battery cell; and a gas adsorption unit, disposed in the chamber.
1 . A gas adsorption apparatus, applicable to a battery cell, and comprising:
a main body, containing a chamber;
a first pressure relief portion, disposed on the main body, and configured to be actuated when an internal pressure or temperature of the battery cell reaches a first threshold, so as to implement communication between the chamber and an interior of the battery cell; and
a gas adsorption unit, disposed in the chamber, wherein the gas adsorption unit comprises particles with an adsorbent core and sealing element shell the adsorbent is configured to absorb a gas generated by the battery cell in use, the sealing element is configured to seal the adsorbent, and the sealing element is configured to allow passage of gas and prevent passage of liquid, wherein the adsorbent comprises a mixture of basic oxide and hydroxide.
2 . The gas adsorption apparatus according to claim 1 , wherein a water vapor permeability of the sealing element is less than 30 g×25 μm/m2×24 h×0.1 MPa.
3 . The gas adsorption apparatus according to claim 1 , wherein the gas adsorption apparatus comprises a plurality of gas adsorption units.
4 . The gas adsorption apparatus according to claim 3 , wherein adsorbents in the plurality of gas adsorption units are different from each other, so as to absorb different types of gases.
5 . The gas adsorption apparatus according to claim 1 , wherein a molar ratio between the hydroxide and the basic oxide in the mixture is 1:1 to 1:10.
6 . The gas adsorption apparatus according to claim 1 , wherein both the main body and the first pressure relief portion are made of metal.
7 . The gas adsorption apparatus according to claim 1 , wherein the first pressure relief portion is recessed toward an exterior of the chamber against an inner surface of the main body.
8 . The gas adsorption apparatus according to claim 1 , wherein the gas adsorption apparatus further comprises:
a gas-permeable film, covering the first pressure relief portion, wherein the gas-permeable film is configured to allow passage of gas and prevent passage of liquid.
9 . An end cap assembly, applicable to a battery cell, and comprising:
an end cap;
an insulation piece, mounted on a side that is of the end cap and that is close to an interior of the battery cell; and
the gas adsorption apparatus according to claim 1 , wherein the gas adsorption apparatus is mounted in the insulation piece and/or the end cap.
10 . The end cap assembly according to claim 9 , wherein the main body comprises a first outer surface oriented back from the end cap, and the first pressure relief portion is disposed on an outer surface of the main body other than the first outer surface.
11 . The end cap assembly according to claim 9 , wherein the first pressure relief portion is located on a side that is of the main body and that is close to the end cap.
12 . The end cap assembly according to claim 9 , wherein the insulation piece contains a cavity configured to accommodate the gas adsorption apparatus.
13 . The end cap assembly according to claim 9 , wherein the end cap assembly further comprises:
a second pressure relief portion, disposed in the end cap, wherein the second pressure relief portion is configured to be actuated when an internal pressure or temperature of the battery cell reaches a second threshold, so as to release the internal pressure of the battery cell, wherein
the first threshold is less than the second threshold.
14 . The end cap assembly according to claim 13 , wherein the end cap assembly further comprises:
a position limiting structure, disposed in the end cap and/or the gas adsorption apparatus, and configured to prevent the gas adsorption apparatus from contacting the second pressure relief portion.
15 . A battery cell, comprising the gas adsorption apparatus according claim 1 .
16 . A battery, comprising the battery cell according to claim 15 .
17 . An electrical device, comprising the battery cell according to claim 15 .