Battery electrode and secondary battery using the same

Abstract

The present application relates to the field of energy storage devices and, in particular, relates to a battery electrode, and a secondary battery using the battery electrode. The battery electrode comprises an electrode tab, a current collector, and a diaphragm attached onto at least one surface of the current collector, wherein the diaphragm is provided with a groove, the electrode tab is embedded into the groove and is electrically connected with the current collector, the electrode tab comprises an embedded portion embedded in the groove and an exposed portion protruded outside the groove; wherein an upper surface of the embedded portion is covered with an active material coating layer. According to the present application, an embedded electrode tab is adopted, and a diaphragm covers a surface of an embedded portion.

What is claimed is: 
     
         1 . A battery electrode, comprising an electrode tab, a current collector, and a diaphragm attached onto at least one surface of the current collector, wherein the diaphragm is provided with a groove, the electrode tab is embedded into the groove and is electrically connected with the current collector, the electrode tab comprises an embedded portion embedded in the groove and an exposed portion protruded outside the groove; wherein, an upper surface of the embedded portion is covered with an active material coating layer. 
     
     
         2 . The battery electrode according to  claim 1 , wherein, a sum of a thickness of the embedded portion and a thickness of the active material coating layer is not greater than a thickness of the diaphragm. 
     
     
         3 . The battery electrode according to  claim 2 , wherein, a sum of a thickness of the embedded portion and a thickness of the active material coating layer is equal to a thickness of the diaphragm. 
     
     
         4 . The battery electrode according to  claim 1 , wherein, a depth of the groove is equal to a thickness of the diaphragm. 
     
     
         5 . The battery electrode according to  claim 1 , wherein, the diaphragm and the active material coating layer are made of a same material or different materials. 
     
     
         6 . The battery electrode according to  claim 1 , wherein, the battery electrode is a cathode electrode comprising a cathode electrode tab, a cathode current collector and a cathode diaphragm attached onto at least one surface of cathode current collector, wherein the cathode diaphragm is provided with a first groove, the cathode electrode tab is embedded into the first groove and is electrically connected with the cathode current collector, and the cathode electrode tab comprises a first embedded portion embedded in the first groove and a first exposed portion protruded outside the first groove, an upper surface of the first embedded portion is covered with a cathode active material coating layer. 
     
     
         7 . The battery electrode according to  claim 1 , wherein, the battery electrode is an anode electrode comprising an anode electrode tab, an anode current collector and an anode diaphragm attached onto at least one surface of anode current collector, wherein the anode diaphragm is provided with a second groove, the anode electrode tab is embedded into the second groove and is electrically connected with the anode current collector, and the anode electrode tab comprises a second embedded portion embedded in the second groove and a second exposed portion protruded outside the second groove, an upper surface of the second embedded portion is covered with an anode active material coating layer. 
     
     
         8 . A secondary battery, comprising a cathode electrode and an anode electrode, wherein, the cathode electrode is the battery electrode according to  claim 6 . 
     
     
         9 . A secondary battery, comprising a cathode electrode and an anode electrode, wherein, the anode electrode is the battery electrode according to  claim 7 . 
     
     
         10 . A method for preparing the battery electrode according to  claim 1 , wherein, comprising following steps: welding the embedded portion onto the current collector, and coating an active material on a surface of the current collector, wherein the active material is attached onto upper surfaces of the current collector and the embedded portion, so as to respectively form the diaphragm and the active material coating layer. 
     
     
         11 . A method for preparing the battery electrode according to  claim 1 , wherein, comprising following steps: coating an active material on the current collector to form the diaphragm, providing a groove on the diaphragm, welding the embedded portion into the groove, and filling the active material into the groove and covering an upper surface of the embedded portion so as to form the active material coating layer.