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Electrode pole plate of lithium ion battery, pole plate rolling device and lithium ion battery

A technology of lithium ion battery and electrode sheet, which is applied in battery electrodes, non-aqueous electrolyte battery electrodes, electrode rolling/calendering and other directions to achieve the effects of increasing specific surface area, improving safety in use, and improving migration rate

Active Publication Date: 2017-03-22
欣旺达惠州动力新能源有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a lithium-ion battery electrode pole piece, which aims to solve the negative problems caused by the use of thick active material coating pole pieces in existing high-energy-density lithium-ion batteries

Method used

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  • Electrode pole plate of lithium ion battery, pole plate rolling device and lithium ion battery
  • Electrode pole plate of lithium ion battery, pole plate rolling device and lithium ion battery
  • Electrode pole plate of lithium ion battery, pole plate rolling device and lithium ion battery

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Embodiment Construction

[0025] It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0026] refer to figure 1 and figure 2 , an embodiment of the present invention proposes a lithium-ion battery electrode sheet, including: a current collector 3 and an active material coating 1; the active material coating 1 is evenly coated on both sides of the current collector, and the active material on the two sides is The grooves 2 are evenly distributed on the surface of the coating layer 1 symmetrically.

[0027] In the prior art, some improvement schemes have been adopted to improve the negative effects of the thick pole piece coating, but the prior art still has many shortcomings. Improper temperature control during the coating, baking and drying process will lead to incomplete sublimation or incomplete decomposition of the pore-forming agent, and the presence of residues will have a negative impact ...

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Abstract

The invention discloses an electrode pole plate of a lithium ion battery. The electrode pole plate comprises a current collector and active substance coating layers, wherein the active substance coating layers are uniformly coated at two sides of the current collector, and grooves are symmetrically and uniformly formed in surfaces of the active substance coating layers at two sides. A thick pole plate with specially-shaped grooves in a surface are prepared, the electrolyte retention quantity in the battery can be remarkably increased, and long-term recycle of the battery is promoted; moreover, the specially-shaped grooves are uniformly formed in the surface of the thick pole plate, electrolyte penetration and diffusion are facilitated, and the rate charge-discharge electrochemical performance of the battery is improved; and meanwhile, the specially-shaped grooves are uniformly formed in the surface of the thick pole plate, thus, the specific area of the pole plate is expanded, the polarization current density of the battery during the charge-discharge process is reduced, a lithium precipitation risk of a large-current charging positive electrode separator is improved, and the application safety of the battery is improved.

Description

technical field [0001] The invention relates to the field of new energy, in particular to a lithium ion battery electrode pole piece, a pole piece rolling device and a lithium ion battery. Background technique [0002] With the vigorous promotion of new energy vehicles, the demand for power batteries is increasing. In particular, the desire for high energy, high safety, and long cycle life lithium-ion power batteries is particularly prominent. High energy density lithium-ion power batteries usually have: (1) high active material content per unit mass (volume space), (2) high gram capacity positive / negative electrode materials, (3) lower mass density packaging materials, etc. In recent years, many lithium battery manufacturers have increased the space occupancy ratio of active materials by increasing the coating thickness or compaction density of the active material of the pole piece, so as to achieve the purpose of improving the overall energy density of the battery. Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/13H01M4/139H01M10/0525B21D1/02
CPCB21D1/02H01M4/043H01M4/0435H01M4/13H01M4/139H01M10/0525Y02E60/10
Inventor 冷利民张耀彭凌一
Owner 欣旺达惠州动力新能源有限公司
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