Battery cell, battery, electric apparatus, and manufacturing method and device for battery cell
View Patent ↗This application provides a battery cell. The battery cell may include: a housing including a wall portion; an electrode terminal insulatively mounted on the wall portion; an electrode assembly disposed in the housing, where the electrode assembly may include a body and a first tab, and the first tab may be formed at an end of the body closer to the wall portion; a current collector disposed between the electrode assembly and the wall portion, where the current collector may be configured to connect the first tab and the electrode terminal; and a heat shrink film, where at least a part of the heat shrink film may cover a side of the current collector facing toward the wall portion to insulate the current collector from the wall portion.
1 . A battery cell, comprising:
a housing comprising a wall portion;
an electrode terminal insulatively mounted on the wall portion;
an electrode assembly disposed in the housing, wherein the electrode assembly comprises a body and a first tab, and the first tab is formed at an end of the body closer to the wall portion;
a current collector disposed between the electrode assembly and the wall portion to connect the first tab and the electrode terminal; and
a heat shrink film, wherein at least a part of the heat shrink film covers a side of the current collector facing toward the wall portion to insulate the current collector from the wall portion, wherein
a part of the heat shrink film extends between the electrode terminal and the current collector so that the heat shrink film is clamped and compressed by the electrode terminal and the current collector.
2 . The battery cell according to claim 1 , wherein a gap is present between the heat shrink film and the wall portion.
3 . The battery cell according to claim 1 , wherein the heat shrink film comprises a first portion and a second portion that are integrally formed, the first portion covers the side of the current collector facing toward the wall portion, and the second portion covers an outer peripheral surface of the first tab.
4 . The battery cell according to claim 3 , wherein the current collector is disk-shaped, a diameter of the current collector being smaller than a diameter of the first tab, a step zone is formed between an edge of the current collector and the outer peripheral surface of the first tab, and the heat shrink film covers the step zone.
5 . The battery cell according to claim 3 , wherein the heat shrink film further comprises a third portion, the third portion covering an outer peripheral surface of the body, and the third portion and the second portion being integrally formed.
6 . The battery cell according to claim 5 , wherein the electrode assembly is formed by winding electrode plates and a separator, and the battery cell further comprises an adhesive tape, the adhesive tape adhering to the outer peripheral surface of the body and securing a winding tail end of the electrode plate and/or the separator, and the third portion not overlapping with the adhesive tape.
7 . The battery cell according to claim 1 , wherein the battery cell further comprises an elastic layer, the elastic layer being disposed between the wall portion and the heat shrink film, and the elastic layer being configured to apply an elastic force to the electrode assembly along an axial direction of the electrode assembly.
8 . The battery cell according to claim 1 , wherein the electrode assembly further comprises a second tab, the second tab being formed at an end of the body farther away from the wall portion, the second tab and the first tab having opposite polarities, and the second tab being electrically connected to the housing.
9 . The battery cell according to claim 1 , wherein the housing comprises a housing body and an end cover, the housing body comprising a bottom wall and a side wall, the side wall surrounding the bottom wall, one end of the side wall being connected to the bottom wall, the other end of the side wall enclosing an opening opposite the bottom wall, the end cover covering the opening, and the wall portion being the bottom wall or the end cover.
10 . A battery, comprising the battery cell according to claim 1 .
11 . An electric apparatus, comprising the battery according to claim 10 , wherein the battery is configured to supply electrical energy.
12 . A manufacturing method for battery cell, comprising:
providing a housing and an electrode terminal, wherein the housing comprises a wall portion, and the electrode terminal is insulatively mounted on the wall portion;
providing an electrode assembly, wherein the electrode assembly comprises a body and a first tab, and the first tab is formed at an end of the body closer to the wall portion;
providing a current collector in a way that the current collector is connected to the first tab;
providing a heat shrink film in a way that the heat shrink film is fitted onto the electrode assembly;
heating the heat shrink film to shrink so that at least a part of the heat shrink film covers the current collector;
placing the electrode assembly and the current collector covered with the heat shrink film into the housing, with a side of the current collector covered with the heat shrink film facing toward the wall portion to insulate the current collector from the wall portion; and
connecting the current collector to the electrode terminal, wherein
a part of the heat shrink film extends between the electrode terminal and the current collector so that the heat shrink film is clamped and compressed by the electrode terminal and the current collector.