Battery cell, battery, power consumption device, and battery cell manufacturing method and device

1 . A battery cell, comprising:

a housing with an opening;

an electrode assembly accommodated in the housing;

an end cover covering the opening and being connected to the housing in a sealed manner; and

a current collecting member accommodated in the housing and being located on a side of the electrode assembly facing the end cover, wherein the current collecting member is configured to be connected to the housing and the electrode assembly, so that the electrode assembly is electrically connected to the housing;

wherein the electrode assembly comprises a first tab, and the first tab is configured to be connected to the current collecting member, the first tab is monolithic;

the battery cell further comprises an insulating element, in a thickness direction of the end cover, the insulating element is located between the first tab and the end cover;

wherein the current collecting member comprises a first connection portion and a second connection portion, in the thickness direction of the end cover, at least a part of the first connection portion is located between the end cover and the electrode assembly, and the first connection portion is configured to be connected to the electrode assembly, a portion of the insulating element is located between the first connection portion and the end cover, and the portion of the insulating element contacts both the first connection portion and the end cover;

the second connection portion is connected to the first connection portion and extends, departing from the electrode assembly, from the first connection portion along the thickness direction of the end cover,

the entire first connection portion is perpendicular to the second connection portion; and

the second connection portion is configured to be connected to the housing;

wherein the first tab comprises a first surface, the first surface being a surface of the first tab away from the electrode assembly, and the entire first surface is physically connected to the insulating element via the first connection portion;

wherein the end cover comprises a body portion and an extension portion, and the extension portion extends from the body portion in a direction departing from the electrode assembly.

2 . The battery cell according to claim 1 , wherein the current collecting member is connected to an inner side surface of the housing.

3 . The battery cell according to claim 2 , wherein an outer side surface of the end cover is arranged opposite to the inner side surface of the housing; and

at least a part of the current collecting member is located between the outer side surface of the end cover and the inner side surface of the housing, and the end cover is configured to abut a part of the current collecting member against the inner side surface of the housing.

4 . The battery cell according to claim 1 , wherein the second connection portion is an annular structure connected to an outer edge of the first connection portion.

5 . The battery cell according to claim 1 , wherein the housing is provided with a limiting portion at one end of the opening; and

the limiting portion is configured to restrict the end cover from separating from the housing along a direction departing from the electrode assembly.

6 . The battery cell according to claim 5 , wherein in the thickness direction of the end cover, at least a part of the end cover is located between the limiting portion and the current collecting member, and the limiting portion and the current collecting member jointly restrict the end cover from moving in the thickness direction of the end cover.

7 . The battery cell according to claim 5 , wherein an inner surface of the housing comprises a stepped face; and

in the thickness direction of the end cover, at least a part of the end cover is located between the limiting portion and the stepped face, and the limiting portion and the stepped face jointly restrict the end cover from moving in the thickness direction of the end cover.

8 . The battery cell according to claim 5 , wherein the limiting portion is in an annular structure.

9 . The battery cell according to claim 5 , wherein the limiting portion is in a flanging structure in which the housing is partially folded inward.

10 . The battery cell according to claim 1 , wherein an inner surface of the housing comprises a stepped face; and

the current collecting member abuts against the stepped face along a direction facing the electrode assembly.

11 . The battery cell according to claim 1 , wherein the battery cell further comprises a sealing element; and

the end cover is connected to the housing in a sealed manner through the sealing element; and

wherein the sealing element is configured to insulate and isolate the housing from the end cover.

12 . The battery cell according to claim 11 , wherein the sealing element is configured to wrap the end cover along a circumferential direction of the opening.

13 . The battery cell according to claim 11 , wherein the housing is provided with a limiting portion at one end of the opening, and in the thickness direction of the end cover, at least a part of the sealing element is located between the end cover and the limiting portion, so as to realize sealing connection between the end cover and the housing; and

wherein the sealing element comprises an enclosing body and a third connection portion, and the third connection portion is connected to the enclosing body; and

at least a part of the end cover is located in the enclosing body, and in the thickness direction of the end cover, the third connection portion is located between the end cover and the limiting portion, so as to realize sealing connection between the end cover and the housing.

14 . The battery cell according to claim 1 , wherein the electrode assembly comprises a main body, the first tab is in a cylindrical structure, one end of the first tab is connected to the main body, and the other end of the first tab is welded to the current collecting member.

15 . The battery cell according to claim 1 , wherein the current collecting member is welded to the housing; and

wherein a melting point of the current collecting member is lower than a melting point of the housing.

16 . A battery cell manufacturing method, comprising:

providing a housing with an opening;

providing an electrode assembly;

providing an end cover;

providing a current collecting member;

connecting the current collecting member to the electrode assembly;

accommodating the electrode assembly and the current collecting member in the housing;

connecting the current collecting member to the housing, so that the electrode assembly is electrically connected to the housing;

covering the opening with the end cover, and enabling the end cover to be connected to the housing in a sealed manner, so that the current collecting member is located on a side of the electrode assembly facing the end cover; and

wherein the connecting the current collecting member to the housing comprises:

welding the current collecting member to the housing from an inside of the housing, wherein a melting point of the current collecting member is lower than a melting point of the housing; and

wherein the manufacturing method further comprises:

after covering the opening with the end cover, flanging the housing, so that the housing forms a limiting portion at an end with the opening, so that the limiting portion restricts the end cover from separating from the housing along a direction departing from the electrode assembly;

wherein the electrode assembly comprises a first tab, and the first tab is configured to be connected to the current collecting member, the first tab is monolithic;

the battery cell further comprises an insulating element, in a thickness direction of the end cover, the insulating element is located between the first tab and the end cover; wherein the current collecting member comprises a first connection portion and a second connection portion, in the thickness direction of the end cover, at least a part of the first connection portion is located between the end cover and the electrode assembly, and the first connection portion is configured to be connected to the electrode assembly, a portion of the insulating element is located between the first connection portion and the end cover, and the portion of the insulating element contacts both the first connection portion and the end cover;

the second connection portion is connected to the first connection portion and extends, departing from the electrode assembly, from the first connection portion along the thickness direction of the end cover,

the entire first connection portion is perpendicular to the second connection portion, and

the second connection portion is configured to be connected to the housing;

wherein the first tab comprises a first surface, the first surface being a surface of the first tab away from the electrode assembly, and the entire first surface is physically connected to the insulating element via the first connection portion;

wherein the end cover comprises a body portion and an extension portion, and the extension portion extends from the body portion in a direction departing from the electrode assembly.

17 . A battery cell manufacturing device, comprising:

a first providing apparatus configured to provide a housing with an opening;

a second providing apparatus configured to provide an electrode assembly;

a third providing apparatus configured to provide an end cover;

a fourth providing apparatus configured to provide a current collecting member; and

an assembling apparatus configured to connect the current collecting member to the electrode assembly; accommodate the electrode assembly and the current collecting member in the housing; connect the current collecting member to the housing, so that the electrode assembly is electrically connected to the housing; and cover the opening with the end cover, and enable the end cover to be connected to the housing in a sealed manner, so that the current collecting member is located on a side of the electrode assembly facing the end cover;

wherein the electrode assembly comprises a first tab, and the first tab is configured to be connected to the current collecting member, the first tab is monolithic;

the battery cell further comprises an insulating element, in a thickness direction of the end cover, the insulating element is located between the first tab and the end cover; wherein the current collecting member comprises a first connection portion and a second connection portion, in the thickness direction of the end cover, at least a part of the first connection portion is located between the end cover and the electrode assembly, and the first connection portion is configured to be connected to the electrode assembly, a portion of the insulating element is located between the first connection portion and the end cover, and the portion of the insulating element contacts both the first connection portion and the end cover;

the second connection portion is connected to the first connection portion and extends, departing from the electrode assembly, from the first connection portion along the thickness direction of the end cover,

the entire first connection portion is perpendicular to the second connection portion, and

the second connection portion is configured to be connected to the housing;

wherein the first tab comprises a first surface, the first surface being a surface of the first tab away from the electrode assembly, and the entire first surface is physically connected to the insulating element via the first connection portion;

wherein the end cover comprises a body portion and an extension portion, and the extension portion extends from the body portion in a direction departing from the electrode assembly.

18 . The battery cell according to claim 1 , wherein an inner side surface of the housing is approximately parallel to the second connection portion, and the second connection portion is welded to the inner side surface of the housing;

wherein an inner surface of the housing comprises a stepped face connected to the inner side surface, and the first connection portion abuts against the stepped face in a direction facing the electrode assembly.

19 . The battery cell according to claim 1 , wherein the battery cell further comprises a sealing element, the end cover is connected to the housing through the sealing element;

the sealing element comprises an enclosing body, a third connection portion and a fourth connection portion, the enclosing body, the third connection portion, and the fourth connection part are sequentially connected, the enclosing body is located outside the extension portion, and the fourth connection portion is located inside the extension portion, in the thickness direction, the third connection portion is located on a side of the extension portion facing away from the electrode assembly.