Electrode assembly, battery cell, battery, device, manufacturing method, and manufacturing device
An electrode assembly, a battery cell, a battery, a device, a manufacturing method, and a manufacturing device are provided. In some embodiments, the electrode assembly includes at least two electrode plates, including a first electrode plate and a second electrode plate that are of opposite polarities. The first electrode plate and the second electrode plate are wound around a winding axis to form a multilayer structure. The multilayer structure includes an accommodation cavity extending along a direction of the winding axis. The accommodation cavity is configured to accommodate an electrolytic solution. The electrode assembly further includes at least one guide path extending along a first direction. The first direction is a direction perpendicular to the winding axis. The guide path is configured to guide the electrolytic solution out of the accommodation cavity.
1 . An electrode assembly comprising:
at least two electrode plates, comprising a first electrode plate and a second electrode plate that are of opposite polarities, the first electrode plate and the second electrode plate being wound around a winding axis to form a multilayer structure, the multilayer structure comprising an accommodation cavity extending along a direction of the winding axis, the accommodation cavity being configured to accommodate an electrolytic solution,
wherein, the electrode assembly further comprises at least one guide path extending along a first direction, the first direction being a direction perpendicular to the winding axis, and the guide path being configured to guide the electrolytic solution out of the accommodation cavity,
an active material region of the first electrode plate and an active material region of the second electrode plate are wound to form a body region, the body region comprises a plurality of stacked active material portions, a non-active material region of the first electrode plate or a non-active material region of the second electrode plate is wound to form a tab region, the tab region comprises a plurality of stacked tab portions, and the accommodation cavity runs through the body region and the tab region along the direction of the winding axis,
the plurality of tab portions comprise a plurality of consecutively arranged first tab portions, each first tab portion being provided with a plurality of first holes that run through the first tab portion along a thickness direction of the first tab portion, and the first holes of all the first tab portions are configured to be arranged opposite to each other along the first direction to form the guide path,
in a direction from outside to inside of the electrode assembly, apertures of the plurality of first holes decrease progressively, the guide path located at an outer side of the electrode assembly is larger than at an inner side of the electrode assembly.
2 . The electrode assembly according to claim 1 , wherein the electrode assembly is a cylindrical structure, and the first direction is a radial direction of the cylindrical structure.
3 . The electrode assembly according to claim 1 , wherein an outermost tab portion in the tab region is the first tab portion, and an outer end of the guide path is in direct communication with an external space of the electrode assembly.
4 . The electrode assembly according to claim 1 , wherein an innermost tab portion in the tab region is the first tab portion, and an inner end of the guide path is in direct communication with the accommodation cavity.
5 . The electrode assembly according to claim 1 , wherein the plurality of tab portions further comprise a plurality of consecutively arranged second tab portions, the second tab portions being not provided with the first hole, all the plurality of second tab portions are located between the guide path and the accommodation cavity, and an inner end of the guide path communicates to the accommodation cavity through a gap between two adjacent second tab portions.
6 . The electrode assembly according to claim 1 , wherein the accommodation cavity comprises a first accommodation cavity located in the body region and a second accommodation cavity located in the tab region, and, along a direction perpendicular to the winding axis, a size of the second accommodation cavity is larger than a size of the first accommodation cavity.
7 . The electrode assembly according to claim 1 , wherein a central axis of the accommodation cavity coincides with the winding axis.
8 . A battery cell comprising: a housing, an end cap, and the electrode assembly according to claim 1 , wherein an opening is made at an end of the housing along the direction of the winding axis, the end cap is configured to close the opening, and the electrode assembly is disposed in the housing.
9 . The battery cell according to claim 8 , wherein, an injection hole is made on the end cap, and the injection hole is disposed opposite to the accommodation cavity along the direction of the winding axis, so that the electrolytic solution is able to enter the accommodation cavity through the injection hole.
10 . A battery comprising the battery cell according to claim 8 .
11 . An electrical device comprising the battery according to claim 10 , and the battery is configured to provide electrical energy.
12 . A method for manufacturing an electrode assembly, wherein the method comprises:
providing at least two electrode plates, comprising a first electrode plate and a second electrode plate that are of opposite polarities; and
winding the first electrode plate and the second electrode plate around a winding axis to form a multilayer structure, wherein the multilayer structure comprises an accommodation cavity extending along a direction of the winding axis, the accommodation cavity is configured to accommodate an electrolytic solution, at least one guide path extending along a first direction is formed in the electrode assembly after the winding, the first direction is a direction perpendicular to the winding axis, and the guide path is configured to guide the electrolytic solution out of the accommodation cavity,
wherein an active material region of the first electrode plate and an active material region of the second electrode plate are wound to form a body region, the body region comprises a plurality of stacked active material portions, a non-active material region of the first electrode plate or a non-active material region of the second electrode plate is wound to form a tab region, the tab region comprises a plurality of stacked tab portions, and the accommodation cavity runs through the body region and the tab region along the direction of the winding axis,
the plurality of tab portions comprise a plurality of consecutively arranged first tab portions, each first tab portion being provided with a plurality of first holes that run through the first tab portion along a thickness direction of the first tab portion, and the first holes of all the first tab portions are configured to be arranged opposite to each other along the first direction to form the guide path,
in a direction from outside to inside of the electrode assembly, apertures of the plurality of first holes decrease progressively, the guide path located at an outer side of the electrode assembly is larger than at an inner side of the electrode assembly.