A winding type double-core package, a manufacturing method of a winding type double-core package, and a lithium-ion battery
A manufacturing method and winding technology, which are applied in the direction of winding/folding electrodes, secondary batteries, final product manufacturing, etc., can solve the problems of complex manufacturing process, low production efficiency, low space utilization rate, etc., and achieve a simple manufacturing process. , High production efficiency, space saving effect
Active Publication Date: 2021-01-12
桑德新能源技术开发有限公司
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Problems solved by technology
[0007] Aiming at the existing technical problems of low space utilization rate, complicated manufacturing process and low production efficiency, the present invention provides a winding double-core pack, a manufacturing method of the wound double-core pack and a lithium-ion battery
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[0052] In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings.
[0053] In this embodiment, a winding double-core package is provided, which includes a first pole piece 6 , a second pole piece and a diaphragm.
[0054] refer to figure 1 , the first pole piece 6 includes a first empty foil area 602 , and first dressing areas 601 located on both sides of the first empty foil area 602 .
[0055] refer to figure 2 , the second pole piece includes a second coating area 701 located at one end of the second pole piece, and a second empty foil area 702 located at the other end of the second pole piece.
[0056] refer to figure 2 , image 3A second pole piece is superimposed on the upper sides of the two first dressing areas 601 of the first pole piece 6, and the empty foil area of the second pole piece is set toward the outs...
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The invention belongs to the technical field of batteries, and in particular relates to a winding double-core bag, a manufacturing method of the winding double-core bag, and a lithium-ion battery. The double-core package includes the first pole piece, the second pole piece and the diaphragm; the first pole piece includes the first empty foil area, and the dressing area located on both sides of the first empty foil area; the second pole piece includes the The second dressing area at one end, and the second empty foil area located at the other end of the second pole piece; a second pole piece is stacked on the upper sides of the two first dressing areas of the first pole piece, and the empty foil area of the second pole piece The foil area is set toward the outside of the first pole piece; a diaphragm is arranged between the first pole piece and the second pole piece; the first pole piece, the second pole piece and the diaphragm are wound to form an integrated core package, and the integral core package is formed along the first pole piece. The empty foil area is folded in half to form a double-core package, and the first empty foil area and the second empty foil area form two tabs of the double-core package. On the one hand, the core package improves the volumetric energy density of the battery, and on the other hand, it has the advantages of simple manufacturing process and high production efficiency.
Description
technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a winding double-core bag, a manufacturing method of the winding double-core bag, and a lithium-ion battery. Background technique [0002] At present, the mainstream secondary batteries can be classified according to the final shape of the core package into: cylindrical winding type, square stacked sheet type, and square winding type. Under the premise of the same capacity and proportion of a single core package, the general cylindrical winding type has the fastest forming speed, the square winding type is second, and the square stacked type is the slowest. Therefore, in order to increase the speed of core package forming and thus improve the production efficiency of batteries, the winding type has become the preferred choice. Considering the heat dissipation and energy density of large secondary batteries, the square winding core pack has more advantages. [0003...
Claims
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IPC IPC(8): H01M10/04H01M10/0525H01M10/0587
CPCH01M10/0431H01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 李奇李杨郭丽媛娄忠良
Owner 桑德新能源技术开发有限公司