# US 12,191,531 B1 · Energy storage device, welding method for energy storage device, and electricity-consumption device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,531 B1 - Document ID: US12191531B1 - Status: Granted - Kind: B1 - Application number: 18/733,560 - Filed: 2024-06-04 - Published: 2024-12-19 - Granted: 2025-01-07 - Earliest claimed: 2023-06-14 - Assignees: Shenzhen Hithium Energy Storage Technology Co., Ltd.; Xiamen Hithium Energy Storage Technology Co., Ltd. - Applicants: Shenzhen Hithium Energy Storage Technology Co., Ltd.; Xiamen Hithium Energy Storage Technology Co., Ltd. - Inventors: Yongfeng Xiong - Web page: https://patentgrep.com/patent/US12191531B1 ## CPC - B23K 26/282: of tube sections - H01M 50/536: characterised by the method of fixing the leads to the electrodes, e.g. by welding - B23K 26/21: by welding - H01M 10/0422: {Cells or battery with cylindrical casing} - H01M 10/0431: {Cells with wound or folded electrodes (H01M10/045 takes precedence)} - H01M 50/107: having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence) - H01M 50/15: for prismatic or rectangular cells (H01M50/153 takes precedence) - H01M 50/152: for cells having curved cross-section, e.g. round or elliptic (H01M50/15, H01M50/153 take precedence) - H01M 50/169: by welding, brazing or soldering - H01M 50/531: Electrode connections inside a battery casing - H01M 50/533: characterised by the shape of the leads or tabs - H01M 50/538: Connection of several leads or tabs of wound or folded electrode stacks - H01M 50/566: by welding, soldering or brazing - H01M 50/627: Filling ports - Y02E 60/10: Energy storage using batteries - B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract This disclosure provides an energy storage device, a welding method for an energy storage device, and an electricity-consumption device. The energy storage device includes an end cap, a housing, and a current collector arranged between the end cap and the housing. The current collector includes a main body and a welding portion, and 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 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. ## Claims ### Claim 1 An energy storage device, 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. ### Claim 2 (depends on 1) The energy storage device of claim 1, wherein a first positioning portion protrudes from the first surface of the main body, an outer peripheral side surface of the first positioning portion is spaced apart from the outer peripheral side surface of the main body, the end cap comprises a first portion and a second portion, the second portion is connected to a periphery of the first portion in a bending manner, a surface of the second portion close to the main body is connected to the first surface, and an inner peripheral side surface of the second portion abuts against the outer peripheral side surface of the first positioning portion. ### Claim 3 (depends on 2) The energy storage device of claim 2, wherein an end of the first positioning portion facing away from the main body is spaced apart from a surface of the first portion facing the main body. ### Claim 4 (depends on 2) The energy storage device of claim 2, wherein the first positioning portion has a first top surface and a first side surface, the first top surface faces away from the first surface, the first side surface is connected to the first top surface in a bending manner, the first side surface is further connected to the first surface, and a connection between the first top surface and the first side surface has an arc chamfer. ### Claim 5 (depends on 2) The energy storage device of claim 2, wherein the first positioning portion comprises a positioning convex ring arranged in a circumferential direction of the second portion. ### Claim 6 (depends on 2) The energy storage device of claim 2, wherein the first positioning portion comprises a plurality of positioning protrusions spaced apart from each other. ### Claim 7 (depends on 6) The energy storage device of claim 6, wherein each of the plurality of positioning protrusions is inclined towards a central axis of the main body, and an included angle α between the first surface and an outer peripheral side surface of each of the plurality of positioning protrusions facing away from the central axis of the main body satisfies: 80°≤α≤85°. ### Claim 8 (depends on 7) The energy storage device of claim 7, wherein the main body defines a plurality of first through holes penetrating through both the first surface and the second surface. ### Claim 9 (depends on 8) The energy storage device of claim 8, wherein at least one first through hole and at least one positioning protrusion that is connected to an inner side wall of the first through hole cooperatively form a first folding group, and the first folding group and the main body are integrally formed by a stamping process. ### Claim 10 (depends on 1) The energy storage device of claim 1, wherein a plurality of limiting protrusions are arranged spaced apart from each other on the first surface of the main body, an outer peripheral side surface of each of the plurality of limiting protrusions is spaced apart from the outer peripheral side surface of the main body, the end cap comprises a first portion and a second portion, the second portion is connected to a periphery of the first portion in a bending manner, a surface of the second portion close to the main body is connected to the first surface, and a surface of each of the plurality of limiting protrusions facing away from the main body abuts against a surface of the first portion facing the main body. ### Claim 11 (depends on 1) The energy storage device of claim 1, further comprising an electrode assembly, wherein the housing defines an accommodating cavity, the electrode assembly is arranged in the accommodating cavity, the electrode assembly has a winding shape and has a hollow structure, a second positioning portion is arranged on the second surface of the main body, and at least part of the second positioning portion is inserted into the hollow structure. ### Claim 12 (depends on 11) The energy storage device of claim 11, wherein the main body defines a first liquid-injection hole penetrating through both the first surface and a side of the second positioning portion facing away from the end cap, an orthographic projection of the first liquid-injection hole on a surface of the electrode assembly facing the current collector falls within the hollow structure, the end cap defines a second liquid-injection hole, the end cap and the current collector cooperatively define a cavity, and the first liquid-injection hole and the second liquid-injection hole are both in communication with the cavity. ### Claim 13 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. ### Claim 14 (depends on 13) The electricity-consumption device of claim 13, wherein a first positioning portion protrudes from the first surface of the main body, an outer peripheral side surface of the first positioning portion is spaced apart from the outer peripheral side surface of the main body, the end cap comprises a first portion and a second portion, the second portion is connected to a periphery of the first portion in a bending manner, a surface of the second portion close to the main body is connected to the first surface, and an inner peripheral side surface of the second portion abuts against the outer peripheral side surface of the first positioning portion. ### Claim 15 (depends on 14) The electricity-consumption device of claim 14, wherein an end of the first positioning portion facing away from the main body is spaced apart from a surface of the first portion facing the main body. ### Claim 16 (depends on 14) The electricity-consumption device of claim 14, wherein the first positioning portion has a first top surface and a first side surface, the first top surface faces away from the first surface, the first side surface is connected to the first top surface in a bending manner, the first side surface is further connected to the first surface, and a connection between the first top surface and the first side surface has an arc chamfer. ### Claim 17 (depends on 14) The electricity-consumption device of claim 14, wherein the first positioning portion comprises a positioning convex ring arranged in a circumferential direction of the second portion. ### Claim 18 (depends on 14) The electricity-consumption device of claim 14, wherein the first positioning portion comprises a plurality of positioning protrusions spaced apart from each other. ### Claim 19 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. ### Claim 20 (depends on 19) The welding method of claim 19, wherein exposing the outer peripheral side surface of the current collector, comprises: the current collector protrudes from the end cap and the housing by a width L3, wherein the width L3 satisfies: 0.25 mm≤L3≤2 mm.