Contemporary Amperex Technology Co., Ltd.

Contemporary Amperex Technology (hong Kong) Limited

Ting Li

Xing Ji

Xiaobo Chen

Haizu Jin

Xianda Li

Shaojun Niu

Shaoji Wu

Yucang Hao

Longqing Peng

Huaichao Tang

The electrode sheet includes a current collector, an active material layer, a first insulating layer, and a second insulating layer. The current collector includes a body portion and a tab extending from a first end of the body portion. The body portion includes a coated region and a transition region provided between the coated region and the tab; the active material layer is provided on a surface of the coated region; the first insulating layer is provided on an end surface of the body portion; at least part of the second insulating layer is provided on a surface of the transition region; the second insulating layer includes a first thermoplastic polymer and a second thermoplastic polymer.

Electrode sheet and preparation method therefor, battery cell, battery, and electric device

An electrode sheet, a preparation method, a battery cell, a battery, and an electric device are provided. The electrode sheet includes a current collector having a main body and a tab extending from a first end of the main body in a first direction. The main body includes a coated region and a transition region located between the coated region and the tab. An active material layer is formed on the coated region. A first insulating layer is disposed on the end face of the first end. A second insulating layer is at least partially disposed on the surface of the transition region and includes a thermoplastic polymer. The thermoplastic polymer has a volumetric particle size distribution DV50 of 6-10 μm and a maximum particle size Dmax of 90-110 μm. The electrode sheet improves the reliability of the battery cell.

Electrode sheet, preparation method therefor, battery cell, battery, and electric device

A protection method for a secondary battery includes evacuating the secondary battery through an injection opening of the secondary battery to within 100 kPa, introducing a first reactant into the secondary battery through the injection opening until a pressure of the secondary battery rises by more than 1 Pa and maintaining the pressure for more than 1 ms, evacuating the secondary battery through the injection opening to within 100 kPa, and introducing a second reactant into the secondary battery through the injection opening until the pressure rises by more than 1 Pa and maintaining the pressure for more than 1 ms, thereby forming a protection layer on an internal surface of the secondary battery.

Protection method and device for secondary battery, secondary battery, battery module, battery pack, and electric apparatus

Embodiments of this application provide an explosion-proof valve, a battery pack, and an apparatus. The explosion-proof valve includes a flame arresting member and an air permeable membrane. The flame arresting member is configured to connect to a housing of a battery pack, the air permeable membrane is fastened to the flame arresting member, and the battery pack is capable of exchanging gas with the outside through the flame arresting member and the air permeable membrane in sequence. During use of the explosion-proof valve of this application in the battery pack of this application, when thermal runaway occurs inside the housing of the battery pack, pressure inside the housing is suddenly increased, and as a result, the battery pack releases the pressure through the explosion-proof valve, and high-temperature runaway gas impacts and melts the air permeable membrane, forming a smooth air flow channel.

Explosion-proof valve, battery pack, and apparatus

The application provides a method, apparatus, device and medium for detecting an internal short-circuit fault of a battery cell. The method includes obtaining electrical signal values for each of m battery cells of a battery pack, when it is in a preset condition including that a current detection is an ndetection; performing following steps for a target battery cell: calculating a first parameter of the target battery cell using the electrical signal values of the target battery cell, which characterizes a degree of fluctuation of the electrical signal values; calculating a second parameter that characterizes a degree of dispersion between the first parameter of the target battery cell and first parameters of other battery cells; and determining that an internal short-circuit fault occurs in the target battery cell, under a condition that the second parameter is greater than a threshold.

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Ningde, China

Ting Li