US 10,873,066 B2Granted

Vent for secondary battery top cover, top cover assembly, and secondary battery

AssigneeContemporary Amperex Technology Co., Limited

InventorsXiang Li, Peng Wang, Chengyou Xing, Rulai Cai

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Abstract

The present disclosure relates to a vent for a secondary battery top cover, a top cover assembly, a secondary battery and a vehicle. The vent includes a flat base and a protrusion protruding outward with respect to flat base. The protrusion has a main nick and at least one branch nick connected to at least one end of the main nick. An angle formed between the main nick and the branch nick is more than zero. When the pressure inside the case increases excessively, gas causes stress concentration at the protrusion such that the vent is torn along the main nick and the at least one branch nick, thereby releasing the gas in the case, reducing explosion risk of the secondary battery, and improving safety of the secondary battery.

Claims8

Dependent claims

A vent for a secondary battery, comprising a flat base and a protrusion protruding outwardly from the flat base in a direction facing away from the secondary battery with respect to the flat base,

wherein the protrusion is provided with a main nick and at least one branch nick connected to at least one end of the main nick, and an angle formed between the main nick and the at least one branch nick is more than zero, the protrusion has a ridge-shaped sharp corner, and an inner surface of the protrusion forms a recessed portion having a shape corresponding to the protrusion, and
the main nick and the at least one branch nick are provided on an outer surface and an inner surface of the ridge-shaped sharp corner,
wherein the vent further comprises a transition part, the protrusion is connected to the flat base via the transition part, and the transition part is inclined relative to the flat base;
wherein an inclined angle of the transition part is within a range of 2°-15°.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 16/058,510Filed 8 Aug 2018
Priority: CN 2018 1 00204629 Jan 2018
Published: US 2019/0214619 A111 Jul 2019
Granted: 22 Dec 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H01M 50/3425
Non-re-sealable arrangements: in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
H01M 10/0525
Li-accumulators: rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
H01M 50/30
Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells:…
H01M 2220/20
Batteries for particular applications: batteries in motive systems, e.g. vehicle, ship, plane

Family

US 2019/0214619 A1Pre-grant publication · published 11 Jul 2019
US 10,873,066 B2This patent

From the US filing history. Foreign family members aren’t listed.

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