Method of preparing wound cell electrode through compositing process and lithium-ion battery

A composite process and cell technology, which is applied to secondary batteries, battery electrodes, circuits, etc., can solve problems such as uneven tension of winding bare cells, inability to fully protect the diaphragm, and changes in the distance between tabs, so as to reduce the risk of short circuit , high pass rate and improved cycle life

Inactive Publication Date: 2019-10-25
湖北锂诺新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the improvement of battery energy density, people pay more and more attention to its safety performance, especially the use of thinner separator, which makes the separator wrinkle in the battery assembly, and the diaphragm is folded at the end, so that the separator cannot completely protect the anode Problems such as the uneven tension inside the pole piece and the wound bare battery lead to frequent changes in the distance between the tabs; in addition, the separation film is prone to misalignment after the bare battery is stressed during the battery transfer process, which may cause a short circuit of the battery in severe cases

Method used

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  • Method of preparing wound cell electrode through compositing process and lithium-ion battery
  • Method of preparing wound cell electrode through compositing process and lithium-ion battery
  • Method of preparing wound cell electrode through compositing process and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] First, the upper separator (3), the lower separator (5) and the negative electrode sheet (4) are heated and compounded by the heating press rollers (6) and (7), and then the positive electrode sheet (2) is passed through the one-way roller (8) And (9), take shape by rolling pin (1). The heating press rollers (6), (7) are heated at a constant temperature, and the heating temperature is 35-60° C.; the isolation film is composed of a polyvinylidene fluoride polymer coating and a polypropylene base film. The negative electrode is graphite, and the positive electrode is lithium iron phosphate. The battery pole piece obtained by the above method can be used to prepare a lithium ion battery through assembly, liquid injection and chemical conversion. The battery can be cycled for a long time without deformation and has a long cycle life. Since the upper and lower separators are adhered to the surface of the negative electrode sheet, the separators at the end section are adhere...

Embodiment 2

[0032] First, the lower separator (5) and the negative electrode sheet (4) are compounded through the heating roller (13) and the top roller (14), and the upper separator (3) and the positive electrode sheet (2) are passed through the heating roller (15) and the unidirectional The top (16) rolls are compounded, and then the left and right heating rollers (17) and (18) are compounded together, and are wound and formed by the needle (1); the heating press rollers (6), (13), (15), (17), and (18) are heated at a constant temperature, and the heating temperature is 35-60° C.; the isolation membrane is composed of polyvinylidene fluoride and polyoxyethylene ether. The isolation film is composed of polyethylene and polypropylene base film and polyvinylidene fluoride and polyoxyethylene ether polymer coating. The negative electrode active material is graphite, and the positive electrode is lithium iron phosphate. The battery pole piece obtained by the above method is assembled, injec...

Embodiment 3

[0035] The difference between this embodiment and Embodiment 2 lies in that the bare cell used as a component has a full tab structure.

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Abstract

The invention discloses a novel isolating membrane compositing and winding process and a lithium-ion battery. The isolating membrane compositing and winding process is characterized in that electrodesand an isolating membrane are composited by hot pressing in advance and then wound into a bare cell. The process can make great improvement on problems such as the change of tab alignment, the deformation of the wound cell and the fold of the isolating membrane caused by the stress of the isolating membrane inside the traditional wound cell. The lithium-ion battery assembled from electrodes containing the composite structure is characterized by good interface contact between the electrodes inside the battery, difficult deformation and longer cycle life.

Description

technical field [0001] The invention belongs to the field of making lithium-ion battery cells, and in particular relates to a composite process for preparing winding cell pole pieces and a lithium-ion battery method thereof. Background technique [0002] There are two common cell assembly methods for lithium-ion batteries: winding type and laminated type. With the improvement of battery energy density, people pay more and more attention to its safety performance, especially the use of thinner separator, which makes the separator wrinkle in the battery assembly, and the diaphragm is folded at the end, so that the separator cannot completely protect the anode Problems such as the uneven tension inside the pole pieces and the wound bare cells lead to frequent changes in the spacing of the tabs. In addition, during the transfer of the cells, the isolation film is prone to dislocation after the bare cells are stressed, and in severe cases, the cells are short-circuited. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587H01M4/04H01M4/139
CPCH01M10/0587H01M4/139H01M4/0435Y02E60/10Y02P70/50
Inventor 孙贤东王晶
Owner 湖北锂诺新能源科技有限公司
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