Lithium-ion battery having desirable safety performance

Abstract

A lithium-ion battery having desirable safety performance includes a positive plate having a positive film, a negative plate having a negative film, a separator between the positive plate and the negative plate, and electrolyte. The positive film is provided with a first recess and a positive lead is soldered in the first recess. The negative film is provided with a second recess and a negative lead is soldered in the second recess. A first insulating glue layer is formed on an upper surface and below a lower surface of the positive lead. Surface of the positive film corresponding to the second recess is pasted with a second insulating glue layer.

What is claimed is: 
     
         1 . A lithium-ion battery, comprising:
 a first plate comprising a first current collector, a first film and a first lead, wherein the first film is disposed on the first current collector and is provided with a first recess configured to receive the first lead, and the first lead is electrically connected to the first current collector;   a first insulating glue layer, disposed on a first location of a surface of the first lead;   a second plate comprising a second current collector, a second film and a second lead, wherein the second film is disposed on the second current collector and is provided with a second recess configured to receive the second lead, and the second lead is electrically connected to the second current collector; and   a separator disposed between the first plate and the second plate;   wherein a length of a portion of the first lead in the first recess is less than a width of a remaining portion of the first film from an edge of the first insulating glue layer covering the first film to an edge of the first film opposite to the first recess; and a second insulating glue layer is disposed on a second location of the surface of the first film corresponding to the second lead in a thickness direction of the first plate and the second plate.   
     
     
         2 . The lithium-ion battery of  claim 1 , wherein, the first plate is a positive plate, the first current collector is a positive current collector, the first film is a positive film, the first lead is a positive lead; and
 the second plate is a negative plate, the second current collector is a negative current collector, the second film is a negative film and the second lead is a negative lead.   
     
     
         3 . The lithium-ion battery of  claim 2 , wherein a distance between a center of the first recess and an end of the positive film is ¼-¾ of a length of the positive film, and a distance between a center of the second recess and an end of the negative film is ¼-¾ of a length of the negative film. 
     
     
         4 . The Lithium-ion battery of  claim 2 , wherein a distance between a center of the first recess and an end of the positive film is half of a length of the positive film, and a distance between a center of the second recess and an end of the negative film is half of a length of the negative film. 
     
     
         5 . The lithium-ion battery of  claim 2 , wherein a length of the first recess is less than a length of the positive lead by 1-100 mm, a width of the first recess is greater than a width of the positive lead by 1-10 mm; and
 a length of the second recess is less than a length of the negative lead by 1-100 mm, a width of the second recess is greater than a width of the negative lead by 1-10 mm.   
     
     
         6 . The lithium-ion battery of  claim 2 , wherein a length of the first recess is less than a width of the positive film by 1-100 mm, and a length of the second recess is less than a width of the negative film by 1-100 mm. 
     
     
         7 . The lithium-ion battery of  claim 2 , wherein a depth of the first recess is no larger than a thickness of the positive film, and a depth of the second recess is no larger than a thickness of the negative film. 
     
     
         8 . The lithium-ion battery of  claim 2 , wherein a depth of the first recess is greater than a thickness of the positive lead by 0.005-0.1 mm, and a depth of the second recess is greater than a thickness of the negative lead by 0.005-0.1 mm. 
     
     
         9 . The lithium-ion battery of  claim 1 , wherein a width of a portion of the first lead in the first recess is greater than a width of a remaining portion of the first recess not occupied by the first lead located on one side of the first lead. 
     
     
         10 . A lithium-ion battery, comprising:
 a first plate, comprising a first current collector, a first film and a first lead, wherein the first film is disposed on the first current collector and is provided with a first recess configured to receive the first lead, and the first lead is electrically connected to the first current collector, the first recess having three sides defined by the first film;   a first insulating glue layer, disposed on a first location of a first surface of the first lead and covering the three sides of the first recess defined by the first film;   a second plate, comprising a second current collector, a second film, and a second lead, wherein the second film is disposed on the second current collector and is provided with a second recess configured to receive the second lead, and the second lead is electrically connected to the second current collector; and   a separator disposed between the first plate and the second plate;   wherein a width of a portion of the first lead in the first recess is greater than a width of a remaining portion of the first recess not occupied by the first lead located on one side of the first lead.   
     
     
         11 . The lithium-ion battery of  claim 10 , wherein:
 the first plate is a positive plate, the first current collector is a positive current collector, the first film is a positive film, the first lead is a positive lead;   the second plate is a negative plate, the second current collector is a negative current collector, the second film is a negative film and the second lead is a negative lead.   
     
     
         12 . The lithium-ion battery of  claim 10 , wherein a distance between a center of the first recess and an end of the first film is ¼-¾ of a length of the first film, and a distance between a center of the second recess and an end of the second film is ¼-¾ of a length of the second film. 
     
     
         13 . The lithium-ion battery of  claim 10 , wherein a distance between a center of the first recess and an end of the first film is half of a length of the first film, and a distance between a center of the second recess and an end of the second film is half of a length of the second film. 
     
     
         14 . The lithium-ion battery of  claim 10 , wherein a length of the first recess is less than a length of the first lead by 1-100 mm, a width of the first recess is greater than a width of the first lead by 1-10 mm; and
 a length of the second recess is less than a length of the second lead by 1-100 mm, a width of the second recess is greater than a width of the second lead by 1-10 mm.   
     
     
         15 . The lithium-ion battery of  claim 10 , wherein a length of the first recess is less than a width of the first film by 1-100 mm, and a length of the second recess is less than a width of the second film by 1-100 mm. 
     
     
         16 . The lithium-ion battery of  claim 10 , wherein a depth of the first recess is no larger than a thickness of the first film, and a depth of the second recess is no larger than a thickness of the second film. 
     
     
         17 . The lithium-ion battery of  claim 10 , wherein a depth of the first recess is greater than a thickness of the first lead by 0.005-0.1 mm, and a depth of the second recess is greater than a thickness of the second lead by 0.005-0.1 mm. 
     
     
         18 . The lithium-ion battery of  claim 10 , wherein a pair of second insulating glue layers directly disposed on two opposite surfaces of the first film at a first location and a second location, respectively, wherein the second lead on the second plate is sandwiched between the pair of second insulating glue layers in a thickness direction of the first plate and the second plate. 
     
     
         19 . The lithium-ion battery of  claim 10 , wherein the first insulating glue layer is disposed on an upper surface and below a lower surface of the first lead in a thickness direction of the first plate and the second plate.