# US 11,909,066 B1 · Battery end cover assembly, energy storage apparatus and electric device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,066 B1 - Document ID: US11909066B1 - Status: Granted - Kind: B1 - Application number: 18/109,332 - Filed: 2023-02-14 - Granted: 2024-02-20 - Earliest claimed: 2022-11-11 - Assignees: Shenzhen Hithium Energy Storage Technology Co., Ltd.; Xiamen Hithium Energy Storage Technology Co., Ltd. - Applicants: Shenzhen Hairun New Energy Technology Co., Ltd.; Xiamen Hithium Energy Storage Technology Co., Ltd. - Inventors: Jinyun Liang; Liangliang Zhang; Wancai Zhang; Ming Yang - Web page: https://patentgrep.com/patent/US11909066B1 ## CPC - H01M 50/3425: {in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member} - H01M 50/103: prismatic or rectangular (H01M50/109, H01M50/11 take precedence) - H01M 50/147: Lids or covers - H01M 50/15: for prismatic or rectangular cells (H01M50/153 takes precedence) - H01M 50/176: for prismatic or rectangular cells (H01M50/181 takes precedence) - H01M 50/55: on the same side of the cell - H01M 50/553: Terminals adapted for prismatic, pouch or rectangular cells - H01M 50/627: Filling ports - H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane - Y02E 60/10: Energy storage using batteries - 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 The present application discloses a battery end cover assembly, an energy storage apparatus and an electric device. The battery end cover assembly includes an end cover; terminal assemblies connected to the end cover; and a pressure relief mechanism disposed on the end cover, wherein the area of a figure formed by an outer contour of the end cover is a first area S1, the area of a projection of the pressure relief mechanism on the end cover is a second area S2, and the second area S2 accounts for 0.5% to 5% of the first area S1. According to the present application, the probability of untimely pressure relief is reduced, and the safety of a battery is improved. Moreover, the overall structural strength of the battery end cover assembly can be guaranteed, and the probability that the pressure relief mechanism falls off to be invalid is reduced. ## Claims ### Claim 1 A battery end cover assembly, comprising: an end cover; terminal assemblies, the terminal assemblies being connected to the end cover; and a pressure relief mechanism, the pressure relief mechanism being disposed on the end cover, and the pressure relief mechanism and the terminal assemblies being distributed at intervals in the length direction of the end cover; wherein the area of a figure formed by an outer contour of the end cover is a first area S1, the area of a projection of the pressure relief mechanism on the end cover is a second area S2, and the second area S2 accounts for 0.5% to 5% of the first area S1; the size of the pressure relief mechanism in the length direction of the end cover is b1, and b1 accounts for 5% to 12% of the length b0 of the end cover; and the size of the pressure relief mechanism in the width direction of the end cover is e1, and e1 accounts for 15% to 25% of the width e0 of the end cover; wherein the pressure relief mechanism comprises an anti-explosion valve, and the anti-explosion valve comprises a preset opening area; the anti-explosion valve is provided with a notch groove, and the notch groove is located in the preset opening area; the minimum thickness of the anti-explosion valve on the position of the notch groove is a first thickness n1, the thickness of the anti-explosion valve on the position of the preset opening area is a second thickness n2, and the first thickness n1 accounts for 15% to 25% of the second thickness n2; and a tensile strength of the anti-explosion valve is 90-130 N/mm2; wherein a contour line on a section, perpendicular to the extension direction of the notch groove, of the notch groove comprises a circular arc line of which the radius r1 is 0.05-0.15 mm. ### Claim 2 (depends on 1) The battery end cover assembly of claim 1, wherein the area of a projection of the notch groove on the end cover is a third area S3, and the third area S3 accounts for 1.0% to 1.5% of the second area S2. ### Claim 3 (depends on 1) The battery end cover assembly of claim 1, wherein a contour line on a section, perpendicular to the extension direction of the notch groove, of the notch groove is U-shaped or C-shaped. ### Claim 4 (depends on 1) The battery end cover assembly of claim 1, wherein the minimum distance between the pressure relief mechanism and each of the terminal assemblies is b2, and b2>b1. ### Claim 5 (depends on 4) The battery end cover assembly of claim 4, wherein 25%≤b1/b2≤35%. ### Claim 6 (depends on 1) The battery end cover assembly of claim 1, wherein the pressure relief mechanism is located on a geometric center of a figure formed by the outer contour of the end cover. ### Claim 7 (depends on 1) The battery end cover assembly of claim 1, wherein the end cover is provided with a liquid injection hole penetrating in the thickness direction thereof, and the liquid injection hole is located between one of the terminal assemblies and the pressure relief mechanism; and the minimum distance between the liquid injection hole and the pressure relief mechanism is b3, the minimum distance between the liquid injection hole and one of the terminal assemblies is b4, and 1.5≤b3/b4≤2. ### Claim 8 (depends on 1) The battery end cover assembly of claim 1, wherein two terminal assemblies are provided and are respectively a positive terminal assembly and a negative terminal assembly, the pressure relief mechanism is located between the two terminal assemblies, the distance between axes of the two terminal assemblies is D1, the minimum distance between the axis of the negative terminal assembly and the outer contour of the end cover is D2, and 5≤D1/D2≤7. ### Claim 9 An energy storage apparatus comprising a battery end cover assembly, wherein the battery end cover assembly comprises: an end cover; terminal assemblies, the terminal assemblies being connected to the end cover; and a pressure relief mechanism, the pressure relief mechanism being disposed on the end cover, and the pressure relief mechanism and the terminal assemblies being distributed at intervals in the length direction of the end cover; wherein the area of a figure formed by an outer contour of the end cover is a first area S1, the area of a projection of the pressure relief mechanism on the end cover is a second area S2, and the second area S2 accounts for 0.5% to 5% of the first area S1; the size of the pressure relief mechanism in the length direction of the end cover is b1, and b1 accounts for 5% to 12% of the length b0 of the end cover; and the size of the pressure relief mechanism in the width direction of the end cover is e1, and e1 accounts for 15% to 25% of the width e0 of the end cover; wherein the pressure relief mechanism comprises an anti-explosion valve, and the anti-explosion valve comprises a preset opening area; the anti-explosion valve is provided with a notch groove, and the notch groove is located in the preset opening area; the minimum thickness of the anti-explosion valve on the position of the notch groove is a first thickness n1, the thickness of the anti-explosion valve on the position of the preset opening area is a second thickness n2, and the first thickness n1 accounts for 15% to 25% of the second thickness n2; wherein a contour line on a section, perpendicular to the extension direction of the notch groove, of the notch groove comprises a circular arc line of which the radius r1 is 0.05-0.15 mm. ### Claim 10 (depends on 9) The energy storage apparatus of claim 9, wherein the area of a projection of the notch groove on the end cover is a third area S3, and the third area S3 accounts for 1.0% to 1.5% of the second area S2. ### Claim 11 (depends on 9) The energy storage apparatus of claim 9, wherein a contour line on a section, perpendicular to the extension direction of the notch groove, of the notch groove is U-shaped or C-shaped. ### Claim 12 (depends on 9) The energy storage apparatus of claim 9, wherein the minimum distance between the pressure relief mechanism and each of the terminal assemblies is b2, and b2>b1. ### Claim 13 (depends on 12) The energy storage apparatus of claim 12, wherein 25%≤b1/b2≤35%. ### Claim 14 (depends on 9) The energy storage apparatus of claim 9, wherein the pressure relief mechanism is located on a geometric center of a figure formed by the outer contour of the end cover. ### Claim 15 (depends on 9) The energy storage apparatus of claim 9, wherein the end cover is provided with a liquid injection hole penetrating in the thickness direction thereof, and the liquid injection hole is located between one of the terminal assemblies and the pressure relief mechanism; and the minimum distance between the liquid injection hole and the pressure relief mechanism is b3, the minimum distance between the liquid injection hole and one of the terminal assemblies is b4, and 1.5≤b3/b4≤2. ### Claim 16 (depends on 9) The energy storage apparatus of claim 9, wherein two terminal assemblies are provided and are respectively a positive terminal assembly and a negative terminal assembly, the pressure relief mechanism is located between the two terminal assemblies, the distance between axes of the two terminal assemblies is D1, the minimum distance between the axis of the negative terminal assembly and the outer contour of the end cover is D2, and 5≤D1/D2≤7. ### Claim 17 (depends on 9) An electric device, comprising the energy storage apparatus of claim 9.