Dongguan Poweramp Technology Limited

Ningde Amperex Technology Limited

Sheng Cheng

Huixin Wang

Hongming Yu

Silin Huang

Xiaowen Zhang

Shaojun Niu

Wei Liang

Jifei Wang

Peilei Yang

Dongming He

A battery cell is disclosed having a cathode including a cathode substrate with a surface coating of a first cathode active material in a first cathode region and a second cathode active material in a second cathode region, an anode including an anode substrate having a surface coating of a first anode active material in a first anode region and a second anode active material in a second anode region, wherein a value CBis a ratio of a unit area capacity Csof the first anode region to a unit area capacity Cscof the first cathode region, a value Cis a ratio of a unit area capacity Csof the second anode region to a unit area capacity Cscof the second cathode region, wherein the surface coating of the cathode and/or anode is a partitioned coating including different active materials, and wherein CB&#x2265;CB.

Electrode and electrochemical device including the same

A lithium secondary battery is disclosed which includes a cathode having a first cathode region and a second cathode region adjacent to the first cathode region, wherein the second cathode region is adjacent to an uncoated region of the cathode substrate; an anode, the anode having a first anode region and a second anode region adjacent to the first anode region, wherein the second anode region is adjacent to an uncoated region of the anode substrate, wherein a value Cis a ratio of a direct current resistance value Rof the first anode region to a direct current resistance value Rof the first cathode region; wherein a value Cis a ratio of a direct current resistance value Rof the second anode region to a direct current resistance value Rof the second cathode region; and wherein C&#x3c;C.

The present application provides an electrochemical device. The electrochemical device, comprising: a positive electrode; a negative electrode; and the separator, disposed between the positive electrode and the negative electrode, wherein the separator comprising a porous substrate, a first coating layer and a second coating layer, the first coating layer and the second coating layer are on a surface of the porous substrate, the first coating layer is disposed on at least one side of the second coating layer, the first coating layer includes a first binder, and the second coating layer includes a second binder, the adhesive force between the first coating layer and the positive electrode or the negative electrode is greater than the adhesive force between the second coating layer and the positive electrode or the negative electrode. The electrochemical device provided by the present application can further improve the cycle performance of the electrochemical device.

Electrochemical device

A battery includes a casing having two first peripheral portions and two second peripheral portions, a cell disposed within the casing, two conductive tabs electrically connected to the cell and exposed from at least one of the first peripheral portions, and an absorbent. Each of the second peripheral portions has a sealed region that has a sealed edge adjacent to the cell. The sealed region of at least one of the second peripheral portions has an inner sealed section disposed adjacent to the sealed edge, an outer sealed section, and an isolating section disposed between the inner sealed section and the outer sealed section. The absorbent is received in the isolating section for absorbing moisture or gas.

Battery

The present disclosure provides a separator and an electrochemical device, the separator is provided with a folded structure unit across a widthwise direction of the separator, and an overlapping part of the folded structure unit is filled with an adhesive. When the separator is applied into a production of the electrochemical device, a winding process can be performed as usual. After an electrolyte injection or high temperature aging of the electrochemical device, the adhesive filled in the folded structure unit of the separator may be dissolved into the electrolyte, the folded structure unit can be unfolded to a flat position again, so as to effectively eliminate deformation of the electrochemical device, which may be caused by thermal contraction of the separator, over stress in the separator wound in a cell, or the separator's binding on expansion of negative and positive electrodes, during operation and production of the electrochemical device.

Growing community of inventors

Ningde, China

Sheng Cheng