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

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.

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.