Energy storage device, welding method for energy storage device, and electricity-consumption device

An electricity-consumption device, comprising:

• a device body;
• and
• an energy storage device, the energy storage device being configured to power the device body and comprising:
• an end cap;
• a housing;
• and
• a current collector arranged between the end cap and the housing, wherein
• an outer peripheral side surface of the end cap is flush with an outer peripheral side surface of the housing;
• the current collector comprises a main body and a welding portion, the main body and the welding portion are integrally formed, the main body has a first surface and a second surface facing away from the first surface, the end cap is connected to the first surface of the main body, the housing is connected to the second surface of the main body, and the welding portion is connected to the outer peripheral side surface of the end cap, the outer peripheral side surface of the housing, and an outer peripheral side surface of the main body;
• the current collector satisfies one of the following:
• the outer peripheral side surface of the main body is flush with both the outer peripheral side surface of the end cap and the outer peripheral side surface of the housing, in a radial direction of the current collector;
• and the outer peripheral side surface of the main body protrudes from both the outer peripheral side surface of the end cap and the outer peripheral side surface of the housing, in the radial direction of the current collector;
• and
• the welding portion protrudes from the end cap by a width L1, wherein the width L1 satisfies:
• 0.05 mm≤L1≤1.45 mm;
• and the welding portion protrudes from the housing by a width L2, wherein the width L2 satisfies:
• 0.05 mm≤L2≤1.45 mm.

A welding method for an energy storage device, comprising:

• providing an end cap, a housing, and a current collector;
• making the end cap abut against a surface of the current collector, make the housing abut against a surface of the current collector facing away from the end cap, and exposing an outer peripheral side surface of the current collector;
• and
• performing circumferential laser welding on an outer peripheral side of the current collector to fixedly connect the current collector to both the end cap and the housing, wherein
• the current collector subject to the circumferential laser welding comprises a main body and a welding portion, the main body and the welding portion are integrally formed, the main body has a first surface and a second surface facing away from the first surface, the end cap is connected to the first surface of the main body, the housing is connected to the second surface of the main body, the welding portion is connected to an outer peripheral side surface of the end cap, an outer peripheral side surface of the housing, and an outer peripheral side surface of the main body;
• the outer peripheral side surface of the end cap is flush with the outer peripheral side surface of the housing;
• the current collector satisfies one of the following:
• the outer peripheral side surface of the main body is flush with both the outer peripheral side surface of the end cap and the outer peripheral side surface of the housing, in a radial direction of the current collector;
• and the outer peripheral side surface of the main body protrudes from both the outer peripheral side surface of the end cap and the outer peripheral side surface of the housing, in the radial direction of the current collector;
• and
• the welding portion protrudes from the end cap by a width L1, wherein the width L1 satisfies:
• 0.05 mm≤L1≤1.45 mm;
• and the welding portion protrudes from the housing by a width L2, wherein the width L2 satisfies:
• 0.05 mm≤L2≤1.45 mm.