A winding battery
A winding type battery technology, applied in the direction of winding/folding electrodes, circuits, electrical components, etc., can solve the problems of reducing the energy density of the battery core, asymmetric structure of the battery core, increasing the thickness of the battery core, etc., so as to save the diaphragm Dosage, reduce the risk of deformation, increase the effect of energy density
Active Publication Date: 2019-02-12
DONGGUAN AMPEREX TECH
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Problems solved by technology
[0003] With the development of the commercialization of secondary batteries, the market has higher and higher requirements for their energy density, such as figure 1 and figure 2 As shown, the inside of the winding cell needs an empty roll separator, and there are 4 layers of separators stacked continuously on the innermost side of the cell, which not only causes waste of the separator, but also increases the thickness of the cell to reduce the energy density of the cell
In addition, the tab is on the innermost side of the cell, that is, the head, which will cause the asymmetry of the cell structure and cause the deformation of the cell
Method used
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[0047] The present application will be further elaborated below in conjunction with specific embodiments. It should be understood that these examples are only used to illustrate the present application and are not intended to limit the scope of the present application.
[0048] This application relates to a winding battery cell 1, which is a flat electric battery formed by stacking and winding the first diaphragm 10, the first pole piece 30, the second diaphragm 20, and the head ends of the second pole piece 40 in sequence. Core, the first separator 10 is located at the innermost side of the flat cell 1;
[0049] The first pole piece 30 includes a first current collector 301 and a first active material layer 302 coated on the surface of the first current collector 301, and the second pole piece 40 includes a second current collector 401 and a first active material layer 302 coated on the surface of the second current collector 401. the second active material layer 402; the fi...
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The present application relates to the field of secondary batteries, in particular, to a winding battery core. The winding cell is formed by stacking and winding the first diaphragm, the first pole piece, the second diaphragm, and the head end of the second pole piece in sequence. The first diaphragm is located on the innermost side of the flat cell; the first pole The first tab is electrically connected to the sheet, and the second tab is electrically connected to the second tab; the first tab and the second tab are located on the flat surface of the flat cell along the length direction and do not overlap in the thickness direction; The distance from the first lug to the tail end of the first current collector does not exceed 1 / 3 of the total length of the first current collector, and the distance from the second lug to the tail end of the second current collector does not exceed 1 / 3 of the total length of the second current collector; The sum of the first diaphragm and the second diaphragm that overlap continuously on the innermost side of the cell at the corresponding position of the tab or / and the second tab in the thickness direction of the flat cell does not exceed two layers. The winding battery cell of the present application can save the amount of diaphragm, increase energy density, and reduce the risk of deformation.
Description
technical field [0001] The present application relates to the field of secondary batteries, in particular, to a winding battery core. Background technique [0002] At present, secondary batteries widely used in the market are composed of battery cells and casings of secondary batteries. Among them, the battery core is an active component, and is generally formed by laminating or winding a positive pole piece, a negative pole piece, and a separator arranged between the positive pole piece and the negative pole piece. The positive electrode sheet includes a positive electrode collector and a positive electrode active material coated on the surface of the positive electrode collector; the negative electrode sheet includes a negative electrode collector and a negative electrode active material coated on the surface of the negative electrode collector. [0003] With the development of the commercialization of secondary batteries, the market has higher and higher requirements for...
Claims
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IPC IPC(8): H01M10/0587
CPCH01M10/0587H01M10/0431H01M10/05Y02E60/10Y02P70/50H01M10/0459H01M10/0525H01M10/125H01M10/14H01M10/286
Inventor 王可飞曾巧袁庆丰耿继斌
Owner DONGGUAN AMPEREX TECH