Cap assembly, battery cell, battery and electric-powered device
View Patent ↗A cap assembly, a battery cell, a battery and an electric-powered device are disclosed. The cap assembly includes: a cap plate, including a liquid injection hole; and a blocking device, disposed on a side of the cap plate facing an electrode assembly of a battery cell and at least partially covering the liquid injection hole, the blocking device including a vent hole, the vent hole being adapted for communicating the liquid injection hole with a space located at a side of the blocking device facing away from the cap plate. By providing the blocking device below the liquid injection hole, the electrolyte can be blocked and prevented from directly flowing out through the liquid injection hole during formation process. When injecting electrolyte through the liquid injection hole, the injected liquid can be prevented from directly spraying onto the electrode assembly and thus causing displacement or deformation of the electrode assembly.
1 . A battery cell comprising:
an electrode assembly; and
a cap assembly, the cap assembly comprising:
a cap plate comprising a liquid injection hole; and
a blocking device disposed on a side of the cap plate facing the electrode assembly and at least partially covering the liquid injection hole, the blocking device comprising at least:
a first blocking plate that forms a first receiving cavity and that is connected with the cap plate along a first peripheral edge of the first blocking plate that surrounds the liquid injection hole; and
a second blocking plate that is connected with the cap plate along a second peripheral edge of the second blocking plate arranged between the first peripheral edge and the liquid injection hole;
wherein the first receiving cavity comprises a first sub-cavity defined between the first blocking plate and the second blocking plate and a second sub-cavity defined between the second blocking plate and the liquid injection hole;
wherein each blocking plate is provided with a vent hole which penetrates through the blocking plate, each vent hole being adapted for communicating the liquid injection hole with a space located at a side of the blocking device facing away from the cap plate; and
wherein each of the blocking plates are spaced apart in a first direction, and the first direction is a direction from the electrode assembly towards the cap plate.
2 . The battery cell according to claim 1 , wherein each blocking plate comprises a side plate and a bottom plate, the side plate being disposed around an outer periphery of the liquid injection hole, the bottom plate being connected to the side plate and opposite to the liquid injection hole, wherein the side plate and the bottom plate of each blocking plate give a cylindrical shape to the respective sub-cavity of each blocking plate.
3 . The battery cell according to claim 1 , wherein each blocking plate is provided with a plurality of vent holes.
4 . The battery cell according to claim 3 , wherein the plurality of vent holes of each blocking plate are arranged on each blocking plate, respectively, at uniform intervals.
5 . The battery cell according to claim 3 , wherein respective diameters of the plurality of blocking plates decrease in the first direction.
6 . The battery cell according to claim 3 , wherein a quantity Q of the blocking plates is in range of 2≤Q≤5.
7 . The battery cell according to claim 5 , wherein the plurality of vent holes on the first and second blocking plates are arranged in a staggered manner so as to extend a path of an electrolyte flowing in said first sub-cavity through the plurality of vent holes.
8 . The battery cell according to claim 7 , wherein each vent hole of the plurality of vent holes on a same blocking plate has a same aperture, and wherein the plurality of vent holes on the first blocking plate are larger in size than the plurality of vent holes on the second blocking plate.
9 . The battery cell according to claim 1 , wherein the blocking device further comprises a liquid absorbing assembly disposed in at least one of the second sub-cavity and the first sub-cavity, and the liquid absorbing assembly is formed as a structure with multiple holes.
10 . The battery cell according to claim 9 , wherein the liquid absorbing assembly comprises a first liquid absorbing piece disposed in the second sub-cavity between the second blocking plate and the liquid injection hole, the first liquid absorbing piece being provided with a plurality of liquid absorbing holes on its surface, and the first liquid absorbing piece having a size larger than an aperture of the liquid injection hole.
11 . The battery cell according to claim 10 , wherein the liquid absorbing assembly comprises a second liquid absorbing piece disposed in the first sub-cavity, between the first and second blocking plates, the second liquid absorbing piece being provided with a plurality of liquid absorbing holes on its surface, and the second liquid absorbing piece having a size larger than the apertures of the vent holes on the first and second blocking plates.
12 . An electric-powered device, comprising the battery cell according to claim 1 , wherein the battery is adapted to provide electrical energy.