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A preparation method for improving the consistency of lithium-ion batteries

A lithium-ion battery, consistent technology, applied in the direction of electrolyte battery manufacturing, non-aqueous electrolyte battery, climate sustainability, etc., can solve the problems that cannot solve the requirements of improving the consistency of lithium-ion power batteries, and achieve the improvement of real consistency , Improve battery performance and prolong service life

Active Publication Date: 2019-01-15
HIGER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing technologies all use one battery cell as the consistency control unit, which cannot solve the requirement of improving the consistency of lithium-ion power batteries

Method used

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  • A preparation method for improving the consistency of lithium-ion batteries
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  • A preparation method for improving the consistency of lithium-ion batteries

Examples

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Effect test

Embodiment 1

[0025] Example 1 The method for improving the consistency of the preparation method of the 44-ampere 177-string battery pack of the rate-type lithium manganate comprises the following steps:

[0026] 1. Clarify the consistency requirements, that is, the standard for batteries connected in series, and the allowable parameter differences in different sections, such as 0.5% capacity,

[0027] 2. Calibrate the consistency control capability of the production line. For example, if the cell is used as the consistency control unit, the capacity difference is 3%.

[0028] 3. Determine the number of units that need to be connected in parallel. For example, the consistency capability of the production line is 3%, and the requirement is 0.5%. The standard deviation σ needs to be reduced by 6 times, and the number of parallel connections is required to be 36.

[0029] 4. Divide the capacity requirement of the battery pack by the number of units that need to be connected in parallel to obt...

Embodiment 2

[0033] A preparation method for improving the consistency of lithium-ion batteries, comprising the steps of:

[0034] (1) Combine the slurry, respectively detect the particle size distribution, density, concentration, and resistivity parameters of the positive electrode slurry and the negative electrode slurry to control the consistency of the slurry;

[0035] (2) Coating, apply the uniformly mixed positive electrode slurry to the positive electrode current collector, apply the uniformly mixed negative electrode slurry to the negative electrode current collector, and detect the surface density, coating thickness, and adhesion parameters respectively to determine Control the consistency of each unit area of ​​pole piece coating;

[0036] (3) Slitting of the pole piece, the positive electrode current collector and the negative electrode current collector obtained in step (2) are finely cut respectively, and the positive electrode piece and the negative electrode piece of the sam...

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Abstract

The invention belongs to a production control method, and the invention claims a preparation method for improving the consistency of lithium ion batteries. The battery prepared by the invention greatly improves the real consistency of the battery, prolongs the service life of the battery and improves the performance of the battery.

Description

technical field [0001] The invention relates to electric vehicles, in particular to the field of manufacturing consistency control of lithium-ion batteries for electric vehicles. Background technique [0002] Lithium-ion batteries are currently the first choice for on-board energy storage power sources for electric vehicles, mainly due to their many advantages, such as high energy density, high power density, low self-discharge, long life, and maintenance-free. Under the current level of power battery technology, electric vehicles must use a large number of batteries connected in series and parallel to form a battery pack to meet the use requirements. However, when the power battery pack is actually used, the performance indicators often cannot reach the level of a single battery cell, and the cycle life is even worse shortened several times or even ten times. The analysis is due to the high nonlinearity of the battery, there are also differences in the manufacturing proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 王世强张卫林张海明方兰兰张建利郭盛昌
Owner HIGER